Method for mapping control channel, method for detecting control channel and device thereof

[0001] The description claims priority from Chinese Patent Application No. 200910107882.0, filed at the Chinese Patent Office on June 16, 2009 under the title "METHOD AND DEVICE FOR MAPPING CONTROL CHANNEL" and Chinese Patent Application No. 200910165300.4, filed at the Chinese Patent Office on August 13, 2009 under the title " METHOD FOR MAPPING CONTROL CHANNEL, METHOD FOR DETECTING CONTROL CHANNEL AND DEVICES THEREOF. "

Field of the invention The invention relates to the field of communication technologies, in particular the control channel mapping method, the control channel detection method and their devices.

Background of the invention [0003] In the E-UTRA communication system (evolved universal terrestrial radio access, developed universal terrestrial radio access) 3GPP (3rd Generation Partnership Project), during transmission of a channel with physical data to the user's equipment ( UE), UE must be notified based on the system scheduling allocation instruction. Scheduling allocation instructions are usually transferred using PDCCH (physical downlink control channel), and scheduling allocation instructions are, for example, DL_grant (downlink scheduling grant). which corresponds to PDSCH (physical downlink shared channel) and UL_grant (uplink scheduling grant), corresponding to PUSCH (physical uplink shared channel).

[0004] In the FDD (frequency division duplex) LTE (long-term evolution) system, data transmission can only be done on the carrier pair of the uplink (uplink) and downlink (uplink) component after UE side (user equipment) and network side, PDCCH includes two types of signaling informing about scheduling: DL_grant and UL_grant, primarily used for informing about scheduling of physical downlink or uplink data resources corresponding to UEs on a component carrier pair. However, after the introduction of carrier aggregation technologies into the LTE-Advanced system, on the UE side and on the network side, data can be sent using multiple carrier components or component carrier pairs at the same time, and the scheduling signaling of the data channel corresponding to each component carrier is coded

- 2 independently such that the resource scheduling signaling on each component carrier requires PDCCH.

[0005] In a carrier aggregation system, a corresponding PDCCH UE may be transmitted on each component carrier to schedule UE UE PDSCH transmission on a component carrier or PUSCH corresponding component carrier. Alternatively, the UE PDCCH may be transmitted on one or more carrier components. At the same time, the PDCCH may not only inform about the data channel transmission on the downlink component carrier on which the PDCCH is located and the corresponding uplink component carrier, but also additionally inform about the data channel transmission on the downlink component carrier, different from that in the case of PDCCH or the component carrier, which is not properly paired to the uplink.

[0006] The 3GPP (3rd Generation Partnership Project) proposal, published on April 4, 2008, number R1-081217, discloses a method for allocating "Compact UL-SCH Assignment in EUTRA".

[0007] US Patent Application for Martin Stumpert et al., Published August 12, 2004 under publication number US2009 / 0088148A1, discloses "Wireless Communication System For Monitoring Physical Downlink Control Channel".

[0008] In the UE, when a PDCCH corresponding to multiple component carriers is transmitted on a carrier component or several carrier components, because the search area corresponding to the control channel has a limited size, the probability of collision between control channels is high, which may translate it is assumed that some of the UE PDCCH cannot be scheduled, so some of the UE data cannot be transmitted and UE performance is decreasing.

Summary of the Invention [0009] Embodiments of the invention provide a method and apparatus for mapping and detecting a control channel to limit the likelihood of a collision between control channels. The following are some aspects of the invention.

1. A method of mapping control channels, including:

for the same level of aggregation, according to the signal length of at least two control channels, corresponding to the component carrier, determining (11) the corresponding UE, specific user equipment search space for at least two control channels that have the same signal length, with at least two control channels that have the same signal length use the same specific UE search space;

mapping (12) at least two control channels that have the same signal length to designate a suitable specific UE search space;

for the same level of aggregation, according to the signal length of at least two control channels, corresponding to the component carrier, determining appropriate specific UE search spaces for at least two other channels

- 3 controls that have different signal lengths, wherein the at least two other control channels that have different signal lengths use other specific UE search spaces in at least one transmission unit; and mapping at least two other control channels that have different signal lengths to determine respective specific UE search spaces.

2. The control channel mapping method according to aspect 1, wherein the at least two control channels that have the same signal length use the same specific UE search space includes:

at least two control channels that have the same signal length and correspond to different component carriers, use the same specific UE search space; or those at least two control channels that have the same signal length and correspond to the same carrier component use the same specific UE search space.

3. A method for mapping control channels according to aspect 1 or 2, wherein determining a corresponding UE specific search space for at least two control channels that have the same signal length or determining corresponding specific UE search spaces for at least two other control channels that have different lengths signal includes:

determining a specific UE search space corresponding to a control channel that has a signal length according to a preliminary specific UE search space corresponding to a control channel having a signal length.

4. The control channel mapping method according to aspect 3, in which the UE initial search space corresponding to the control channel that has the signal length is obtained in the following step:

determining a preliminary specific UE search space corresponding to each component carrier, wherein the initial specific UE search space corresponding to a control channel that has a signal length and corresponds to the same component carrier is the preliminary specific UE search space of the same component carrier.

5. The control channel mapping method according to aspect 3, wherein determining a UE-specific search space corresponding to a control channel that has a signal length according to a preliminary specific UE search space corresponding to a control channel that has a signal length includes:

if one length of the control channel signal corresponding to one component carrier is the same as the length of the control channel signal corresponding to another or several other component carriers, then the specific UE search space corresponding to the control channel which has one signal length

- 4 and corresponding to one carrier component and another or several other carrier component, constitutes all or part of a specific UE search space formed from the initial specific UE search space corresponding to a control channel that has one signal length and corresponds to one component carrier and the initial specific UE search space corresponding to the control channel, which has one signal length and corresponding to another or several other carrier component.

6. A method of detecting control channels, including:

for the same level of aggregation, according to the signal length of at least two control channels corresponding to the component carrier, determining (51) a corresponding specific UE search space for at least two control channels that have the same signal length, wherein at least two control channels, which have the same signal length, use the same specific UE search space;

detecting (52) in the same specific UE search space, two control channels that have the same signal length to determine a corresponding specific UE search space;

for the same level of aggregation, according to the signal length of at least two control channels, corresponding to the component carrier, determining appropriate specific UE search spaces for at least two other control channels that have different signal lengths, wherein at least two other control channels that have other signal lengths use different specific UE search spaces in at least one transmission unit; and detecting, in designated other specific UE search spaces, control channels that have different signal lengths and that are in other specific UE search spaces.

7. The control channel detection method of aspect 6, wherein the at least two control channels having the same signal length use the same specific UE search space includes:

at least two control channels that have the same signal length and correspond to different component carriers, use the same specific UE search space; or at least two control channels that have the same signal length and correspond to the same carrier component use the same specific UE search space.

8. A method of detecting control channels according to aspect 6 or 7, wherein determining a corresponding specific UE lookup space for at least two control channels that have the same signal length or determining

- 5 suitable specific UE search spaces for at least two other control channels that have different signal lengths include:

determining a specific UE search space corresponding to a control channel that has a signal length according to a preliminary specific UE search space corresponding to a control channel having a signal length.

9. The control channel detection method according to aspect 8, wherein the initial UE specific search space corresponding to the control channel that has the signal length is obtained in the following step:

determining a preliminary specific UE search space corresponding to each component carrier, wherein the initial specific UE search space corresponding to a control channel that has a signal length and corresponds to the same component carrier is the preliminary specific UE search space of the same component carrier.

10. The method of detecting control channels according to aspect 8, wherein determining a specific UE search space corresponding to a control channel that has a signal length according to an initial specific UE search space corresponding to a control channel that has a signal length includes:

if one length of the control channel signal corresponding to one component carrier is the same as the length of the control channel signal corresponding to another or several other component carriers, then the specific UE search space corresponding to the control channel that has one signal length and corresponding to one component carrier and another or several other carrier component, constitutes all or part of a specific UE search space, formed from the initial UE specific search space corresponding to a control channel that has one signal length and corresponding to one component carrier and the initial specific UE search space corresponding to the control channel which has one signal length and corresponding to another or several other component carriers.

11. Transmission equipment, including:

a first processing module (61) and a second processing module (62), the first processing module (61) comprising: a first search space designator (611) configured to, for the same level of aggregation, according to the signal length of at least two control channels corresponding to a component carrier, determine a corresponding specific UE search space for at least two control channels that have the same length signal, wherein at least two control channels that have the same signal length use the same specific UE search space; and a first mapping module (612), configured to map at least two control channels that have the same signal length, to

- a corresponding UE specific search space defined by the first module designating (611) the search space; and the second processing module (62) includes: a second search space designator (621) configured to, for the same level of aggregation, according to the signal length of at least two control channels corresponding to the component carrier, designate appropriate specific UE search spaces for at least two other control channels that have a different length signal, with at least two other control channels that have different signal lengths, use another UE specific search space in at least one transmission unit; and a second mapping module (622), configured to map at least two other control channels, which have different signal lengths, to a respective UE specific search space defined by the second search module (621).

12. The transmission equipment of aspect 11, wherein the first designating module (611) the search space comprises:

a first determining unit (6111) configured to, according to the length of the at least two control channels corresponding to the component carrier, determine a corresponding specific UE search space for at least two control channels with the same signal length, wherein at least two control channels that have the same signal length and correspond to different carrier carriers, use the same specific UE search space; or a second determining unit (6112), configured to determine, according to the length of the at least two control channels corresponding to the component carrier, a corresponding UE specific search space for at least two control channels with the same signal length, wherein at least two control channels, which have the same signal length and correspond to the same carrier component, use the same specific UE search space.

13. The transmission equipment of aspect 11 or 12, wherein the first search space module (611) and the second search space module (621) further comprise:

a preliminary search space unit (64) configured to, according to the preliminary specific search space UE, corresponding to the control channel that has the signal length, determine a specific search space corresponding to the control channel that has the signal length.

14. The transmission equipment according to aspect 13, wherein the initial search space unit (64) comprises: a fourth search space sub-unit (644) configured so that if one control channel signal length corresponding to one carrier component is the same as the signal length

- the 7 control channel corresponding to another or several other component carriers is a specific UE search space corresponding to a control channel which has one signal length and corresponds to one component carrier and another or several other component carriers, constitutes all or part of a specific search space UE, formed from the initial UE specific search space corresponding to the control channel, which has one signal length and corresponding to one component carrier and the initial specific UE search space corresponding to a control channel that has one signal length and corresponding to another or several other component carriers.

15. Receiving equipment, including:

a first processing module (71) and a second processing module (72), the first processing module (71) comprising: a first search space designing module (711), configured for the same level of aggregation, according to the signal length of at least two control channels corresponding to a component carrier, to determine a corresponding specific UE search space for at least two control channels that have this same signal length, wherein at least two control channels that have the same signal length use the same specific UE search space; and the first detection module (712), configured to detect control channels that have signal lengths contained in the same specific UE search space in the same specific UE detection space, designated by the first detection space detector (611). ; and the second processing module (72) includes: a second search space designing module (721) configured for the same level of aggregation according to the signal length of at least two control channels corresponding to the component carrier to determine the appropriate specific UE search space for at least two control channels that have different length signal, with at least two control channels, which have different signal lengths use another specific UE search space in at least one transmission unit; and a second detection module (722), configured to detect control channels that have signal lengths contained in the other specific UE search space in another UE-specific detection space (621) determined by the second detection space (621).

16. The receiving equipment according to aspect 15, wherein the first search module (711) the search space comprises:

a first determining unit (7111) configured to, according to the length of the at least two control channels corresponding to the component carrier, determine a corresponding specific UE search space for at least two control channels with the same signal length, wherein at least two control channels that have the same signal length and correspond to others

- 8 carrier component, use the same specific UE search space; or a second determining unit (7112) configured to, according to the length of the at least two control channels corresponding to the component carrier, determine a corresponding specific UE search space for at least two control channels with the same signal length, wherein at least two control channels, which have the same signal length and correspond to the same carrier component, use the same specific UE search space.

17. The receiving equipment according to aspect 15 or 16, wherein the first search space module (711) and the second search space module (721) further comprise:

an initial search space unit (74) configured to, according to the preliminary specific search space UE, corresponding to the control channel that has the signal length, designate a specific search space corresponding to the control channel that has the signal length.

18. The receiving equipment of aspect 17, wherein the initial lookup space unit (74) comprises: the fourth subunit (744) of the initial lookup space, configured so that if one control channel signal length corresponding to one component carrier is the same as the length of the control channel signal corresponding to another or several other component carriers, then the specific UE search space corresponding to a control channel that has one signal length and corresponds to one component carrier and another or several other component carriers, is all or part of the UE specific search space formed from the initial UE specific search space corresponding to a control channel that has one signal length and corresponding to one component carrier and the preliminary specific UE search space corresponding to the control channel which has one signal length and corresponding to another or several other carrier component.

[0010] As it results from the above description regarding the technical solution, in all embodiments of the invention, the search spaces are flexibly configured such that for the same level of aggregation, the respective search spaces are determined for at least two control channels that have different signal lengths, and the designated search spaces are different in at least one transmission unit; as a result, at least two control channels that have different signal lengths correspond to different search spaces, and the probability of collision between at least two control channels that have different signal lengths is limited, while effective scheduling and transmission of channels are provided UE control, translating into successful UE data transmission and increased UE performance. Optimally, on the other hand, thanks to embodiments of the invention, at least two control channels having the same signal length can use the same search space, thereby increasing

- the same flexibility of transmission of control channels that have the same signal length and which correspond to different carrier components, and the likelihood of collision between two control channels that have the same signal length, is limited.

Brief Description of the Drawing [0011] To illustrate the technical solutions according to the embodiments of the invention or according to the prior art, a drawing describing the embodiments or prior art is attached. Of course, the attached drawing describes only some embodiments of the invention.

Fig. 1 is a flowchart of a method for mapping a control channel according to embodiment 1 of the invention;

Fig. 2a is a diagram for a method of mapping a control channel according to embodiment 2 of the invention;

Fig. 2b is a further diagram for the control channel mapping method according to embodiment 2 of the invention;

Fig. 3 is a further diagram for a control channel mapping method according to embodiment 2 of the invention;

Fig. 4 is a diagram for a method of determining a search space for a control channel in a method for mapping a control channel according to embodiment 2 of the invention;

Fig. 5 is a diagram for a method of detecting a control channel according to embodiment 3 of the invention;

Fig. 6 is a diagram of transmission equipment according to embodiment 3 of the invention; and

Fig. 7 is a diagram of receiving equipment according to embodiment 3 of the invention.

Detailed Description of Preferred Embodiments [0012] In order that the objects, technical solutions and advantages of the invention become clearer, the invention will be described in detail with reference to the embodiments and the accompanying drawing. It is clear that the following embodiments are only part of all embodiments of the invention. All other embodiments implemented by those skilled in the art on the basis of the embodiments of the present invention are within the scope of protection of the invention.

[0013] The 3GPP E-UTRA system is also called LTE system. The LTE system supports bandwidths from 1.4 M (6 RB) to 20 M (100 RB), where RB is an abbreviation for Resource Block. For any system bandwidth, in any time transmission unit, for example, in a subframe, the physical PDCCH layer occupies some resources in both the time domain and the frequency domain, and also the time frequency resources that the system allocates to PDCCH are available. In particular, PDCCH occupies all useful frequency domain subcarrier resources. However, in the time domain, the system flexibly configures the time domain resources occupied by PDCCH, assuming the value of the control format index (CFI) in the indicator channel

- physical control format (PCFICH), i.e., adopting several OFDM (orthogonal frequency division multiplexing) symbols. In the system, 2 bits mean three different cases of several OFDM symbols, for example three cases where several OFDM symbols are 1, 2, 3, when the system bandwidth is greater than 10 RB, or three cases where several OFDM symbols are 2 , 3, 4 when the system bandwidth is less than or equal to 10 RB. Time frequency resources (subcarrier resource, number of OFDM symbols) assigned to PDCCH, are divided into many control channel components (CCE), and CCE is the minimum unit forming the PDCCH time frequency resource. The time frequency resource occupied by PDCCH has 4 aggregation levels that correspond to 1, 2, 4, and 8 occupied CCE, and in terms of UE channel quality condition, the system selects the appropriate aggregation level (suitable for different coding rates) to send UE PDCCH.

[0014] In the LTE system, PDCCH physical layers of all UEs are divided in each time transmission unit. It is the UE that performs blind detection in a specific search space for the possibility of the presence of any PDCCH transmission format, using a specific encryption code to detect all possible control channel information lengths, aggregation level and location of the ECC occupied time frequency resource. To limit the number of blind detections performed by the UE in the control channel area, the transmission mode adopted by the UE over a period of time is defined and the search space is planned. The possible transmission mode, accepted by the UE over a period of time, is transmitted to the UE in a semi-static manner, using dedicated signaling. The LTE system has 7 downlink transmission modes, each transmission mode respectively requires the detection of two PDCCH formats, and a specific UE PDCCH format is determined in the search space due to blind detection. The search space is a time frequency resource in a logic element defined according to CCE, and the UE receives control channels and performs blind detection in this space. The search space includes a public search space and UE search space, where the public search space refers to a search space in which all UEs that are connected and requiring PDCCH detection require blind detection, and the UE search space means that only this UE needs detection a blind PDCCH that is in a given search space. In the UE search space, the search space creates a specific amount of CCE that has 4 levels of aggregation. The protocol specifies that the space sizes corresponding to a total of 4 levels of aggregation, consisting of 1, 2, 4 and 8 CCE, are 6, 6, 2 and 2, respectively. In the case of a public search space, embodiments of the invention mainly relate to the mapping method and a method for detecting control channels in the UE search space.

[0015] If the system includes a UE for sending or receiving data, the PDCCH used to schedule the indication may be mapped and transmitted at the appropriate level of CCE aggregation in the specified UE search space or public search space. At the same time, the UE must implement reception and blind detection in a possible search space or public PDCCH mapping and search space. If the detected UE signal data passes cyclically

- redundancy control (CRC), this means that the detected PDDCH is sent to the UE via the system. The UE analyzes the PDDCH according to the signal format defined in the specification to determine the location of the channel time frequency resource over which the UE must receive or send data. Then, the UE performs reception and transmission to ensure communication between the UE and the system.

[0016] In the LTE-Advanced system, the carrier aggregation technology supports more bandwidth to meet the peak data speed requirements of fourth generation ITU (International Telecommunication Union) communication technology. In carrier aggregation, spectra of two or more carrier components are aggregated to obtain an LTE-Advanced system having a larger transmission bandwidth. Each carrier of the component can be configured to be compatible with the LTE system, and the spectra of all carrier components can be adjacent, consecutive spectra, non-adjacent spectra on the same band or even non-consecutive spectra on different bands. UE LTE can only be connected to one pair of compatible component carriers for receiving and transmitting data, and UE LTE-Advanced can be connected to multiple component carriers for receiving and transmitting data simultaneously, depending on the capacity and demand. Carrier aggregation technology is also called spectrum aggregation technology or bandwidth extension technology.

[0017] In the LTE-Advanced system, two or more component carriers are scheduled to one UE at a time for uplink or downlink transmission. In carrier aggregation technology, each component carrier has an independent HARQ (hybrid automatic repeat request) process, and the system can configure the same amount or a different number of component carriers for UE LTE-Advanced to send data channels or control channels. The PDCCH UE may be transmitted on each component carrier for scheduling the PDSCH downlink component carrier channel or the corresponding component carrier PUSCH uplink service channel, and at the same time the PDCCH control channel and the data channel scheduled by the PDCCH control channel may occur on the same component carrier. In addition, all UE PDCCHs may also be transmitted on one or several component carriers for scheduling PDSCH or PUSCH on all scheduled carriers of the uplink or downlink UE component, and at the same time the control channel and data channel scheduled by the control channel may not be present on the same carrier component, which is called the control channel separation from the data channel scheduled by the control channel.

[0018] In a heterogeneous network system, a mechanism of coordination of carrier interference between carrier components of different systems is provided or the quality of control channel transmission is improved, and in order to transfer the control channel carrier with low interference is selected or the control signal is coordinated between different systems to avoid frequent UE switches between different component carriers in the same cell. For example, in the Home NodeB (home service system), a small number of UEs are supported, a small number of control channels are needed and even one control channel in one component carrier is enough to meet

- 12 requirements. Other component carriers can be used for data transmission to increase its speed while coordinating the macro cell to select the component carrier having little interference to transfer the control channel. In a CoMP (coordinated multipoint) transmission / reception system, two or more cells or access points, this is used to transfer data on different carriers of a component of the same UE, but the control channel can be sent only on the carrier parts of the control cell component. If the UE LTE-Advanced has a demand for the uplink service greater than for the downlink service, the number of downlink component carriers configured for the UE may be less than for the uplink component carriers; a downlink component carrier that transmits multiple PDCCHs is certainly provided to schedule corresponding multiple PUSCH uplink channels, thereby preventing UEs from receiving data on unnecessary downlink component carriers. If the aggregated component carriers have uneven bandwidths, primarily when some of the component carrier bandwidth is small, sometimes, the amount of PDDCH for scheduling data on a component carrier is limited, while the remaining data channel resources still exist, and PDDCH for scheduling data transmission carrier small bandwidth can be transmitted by other carriers.

[0019] Embodiments of the invention are illustrated by the example of an LTEAdvanced system, but the invention is not limited to the LTE-Advanced system and also applies to other systems such as WCDMA (wideband code division multiple access) or LTE.

[0020] As shown, Figure 1 is a flowchart of a control channel mapping method according to embodiment 1 of the invention. The method comprises the following steps.

[0021] In step 11, for the same level of aggregation, according to the length of the signal on the control channel corresponding to the component carrier, an appropriate search space is determined for at least two channels with the same signal length to allow at least two control channels with the same signal length using the same search space.

[0022] In step 12, at least two control channels y of the same signal length are mapped to a designated appropriate search space.

[0023] The transmission equipment maps the control channels to the search space, determined according to the signal length, and the transmission equipment, e.g. network equipment, has a base station on the network side.

[0024] In this embodiment, after step 12, the method may further include the step of transmitting control channels mapped to the search space.

[0025] Allowing two control channels having the same signal length to use the same search space includes: allowing at least two control channels that have the same signal length and correspond to different component carriers to use the same search space; or allowing at least two control channels that have the same signal length and correspond to the same carrier component to use the same search space.

[0026] Steps 11 and 12 relate to a method when at least two control channels that have the same signal length occur in one or more component carriers, and when at least two control channels that have different signal lengths, occur in one or more carrier components, steps 11 and 12 may be sequential stages or implemented together with subsequent stages.

[0027] For the same level of aggregation, according to the length of the signal on the control channel corresponding to the component carrier, the respective search spaces are determined for at least two channels with the same signal length to allow at least two control channels to different signal length, use of different search space in at least one transmission unit.

[0028] At least two control channels that have different signal lengths are mapped to the respective designated search spaces.

[0029] The designation of suitable search spaces for at least two channels having different signal lengths to allow at least two control channels with different signal lengths to use different search spaces in at least one transmission unit includes: determining appropriate search spaces for at least two control channels with different signal lengths and which correspond to different carrier components to enable at least two control channels with different signal lengths, to use different search spaces in at least one transmission unit; or determining appropriate search spaces for at least two control channels having different signal lengths and corresponding to the same component carrier to allow at least two control channels with different signal lengths to use different search spaces in at least one transmission unit.

[0030] In practical applications, the mapping principles of the respective control channel search spaces corresponding to the component carriers must be determined before the receive and transmit pages send control channels to each other, including: which control channels with the same signal length and corresponding carriers use the same search space and / or search spaces must be appropriately designated for which control channels with different signal length and corresponding to which carriers. In addition, before determining the mapping rules of the respective control channel search spaces corresponding to the component carriers to perform transmission and detecting control channels at the end of the reception and transmission, based on a preliminary or default mapping rule, the location and size of the search space corresponding to specific or some control channels may also be considered. , corresponding to the carrier component. The method of determining the mapping rules of the appropriate control channel search spaces for component carriers can be specified in a standard protocol obtained directly by the receiving and transmission parties thanks to the algorithms contained in the standard protocol or transferred to the receiving equipment through a transmission terminal using a dedicated

- a signal including a higher layer semi-static signal, a dynamic layer physical signal and a media access layer control channel.

[0031] When determining suitable search spaces for at least two control channels with different signal lengths, the respective spaces for two control channels with different signal lengths are appropriately determined, i.e. the search spaces are independent and do not depend on interrelationships or rules. The respective search spaces for two control channels that have different signal lengths and can be appropriately determined according to different signal length identifiers (IDs) corresponding to two different signal lengths or respectively determined according to the component carrier ID corresponding to two control channels with different signal lengths or determined by one or a combination of the above correlation functions, and the invention does not limit the choice of specific ID parameters. For example, component carrier A has three signal lengths a, b, and component carrier B has four signal lengths a, b, d and e. Control channels with signal length a, can use the same search space, search spaces corresponding to control channels with length the cid signal are determined accordingly, and the determination of the search space corresponding to the control channels that have two cid signal lengths is independent. For example, the search spaces are determined according to the ID of different signal lengths, corresponding to the signal lengths c and d, or determined according to the carrier ID corresponding to the carrier A of the component with the length of the cia signal, carrier ID corresponding to the carrier B of the component having the signal length d or determined according to the combination of the above correlative volumes, and the invention does not limit the choice of specific ID parameters. The result of the determination is such that the search spaces corresponding to control channels with two different signal lengths can be the same or different, depending on the randomization of the search space determination parameter, affecting the way the search space is determined or determined by other independent determination methods. Furthermore, the invention may not limit the search spaces corresponding to control channels that have different signal lengths b and correspond to component A carrier which has different signal lengths and corresponding to component B carrier.

[0032] Preferably, if the control channels with the same signal length use the same search space, the UE performs blind detection in the search space to confirm that the search space corresponds to a specific control channel among all control channels with the same signal length, and thereby reducing the number of blind detections and reducing the detection complexity. In addition, the size of the search space, i.e. the amount of CCE captured, is relatively flexible, and the search space is limited to the maximum extent if the probability of conflicts between control channels is met to limit the number of blind detections in the future. For example, component carrier A has three corresponding signal lengths a, b and c, component carrier B has four corresponding signal length formats a, b, die, and component carrier C has two corresponding signal lengths a and f, so control channels with signal length ai corresponding to the carrier X of the component,

- control channels with signal length ai corresponding to component B carrier and control channels with signal length ai corresponding to component C carrier can use the same search space, while control channels with signal length bi corresponding to component A carrier and control channels with signal length bi corresponding component carrier B can also use the same search space.

[0033] Preferably, the respective search spaces are appropriately determined for control channels of different signal lengths, so the search spaces corresponding to control channels of different signal lengths can be different, thus limiting the likelihood of collision between control channels of different signal lengths, which ensures that UE control channels can be effectively scheduled and transmitted, to achieve successful EU data transmission and increase EU performance. Compared to the case where control channels with different signal lengths have the same search space, the method of determining the search space corresponding to the control channel having each signal length independently allows the control channel having each signal length to obtain its own suitable search space, and when spaces the searches do not overlap and the sizes are the same as for the opposite diagrams, the probability of collision between control channels is limited, and at the same time the number of blind detections does not increase, because only control channels with appropriate signal lengths must be detected in space and correspond to a control channel having any signal length. For example, component carrier A has two appropriate signal lengths a and c, component carrier B has two suitable formats signal length a and b, and component carrier C has one suitable signal length d, search spaces corresponding to search channels with signal lengths c corresponding to carrier A component, search spaces corresponding to control channels with signal length b and corresponding to component B carrier and search spaces corresponding to control channels with signal length d and corresponding to component C carrier are determined in an appropriate manner.

[0034] Preferably, the method of determining the search spaces suitable for the control channel may further include the following step. Control channels with the same signal length and corresponding to one component carrier use the same search space or search spaces corresponding to control channels with different signal lengths and corresponding to one component carrier are determined in an appropriate manner. In the case where control channels with the same signal length and corresponding one carrier component use the same search space, the UE performs a blind detection in the search space to confirm that the search space corresponds to a specific control channel among all control channels with the same signal length, thus limiting the number of times blind detection and reduces detection complexity. In addition, compared to the case in which control channels with different signal lengths and corresponding to one component carrier have the same search space, in embodiments of the invention, a method for determining a search space corresponding to a control channel having any length

- 16 signals independently, allows each signal length to get its own appropriate search space, and when the search spaces do not overlap and sizes are the same as in the opposite schemes, the probability of collision between control channels is limited, while the number of blind detections does not increase out because only control channels with the appropriate signal lengths must be detected in space and correspond to a control channel having each signal length. For example, the component A carrier has the appropriate signal lengths a and b, the search spaces corresponding to the control channels with the signal lengths a and b corresponding to the component A are determined appropriately and independently, and the determination results can be the same or different as depends on the randomization of the search space determination parameter that affects the way the search space is determined.

[0035] In a particular embodiment, control channels y with the same signal length and corresponding to one component carrier, for example Format 0 and format 1A, have the same signal length, whereby two formats may respectively contain 1 bit of information , clearly indicating whether the control channel is in Format 0 or Format 1A. If control channels with the same signal length are from different component carriers, the carrier indication information in the control channel may be multiplexed to distinguish which carrier is particularly indicated so that the detected control channel can correspond to the component carriers scheduled by the control channel, indication information The carrier can be represented by a dominant bit distinguished by using an encryption code, and the specific method is not limited to the invention. The method of adding a bit indication can still be used to distinguish specific control channel formats with the same signal length and corresponding to one component carrier.

[0036] Furthermore, a method of determining a suitable search space for at least two control channels of the same signal length or a method of determining appropriate search spaces for at least two control channels of different lengths, a signal may suitably include the following examples ady.

[0037] In the first example, the initial position and size of the search space corresponding to the control channel is determined.

[0038] Accordingly, according to the signal length ID or signal length group ID, the start position of the search space corresponding to the control channel is determined; or according to a random one or more of: Signal Length ID or Signal Length Group ID and UE ID, Control Channel Format ID, Space Division, Component Carrier ID corresponding to the Control Channel, Subframe Number or Aggregation Level, the start position of the search space corresponding to control channel. In embodiments of the invention, determining the size of the search space may include the following steps. The size of the search space corresponding to the control channel with the signal length is determined according to the signal notification mode, which may change depending on the dynamic signal notification; or size

- 17 the search space corresponding to the control channel with the signal length is determined according to the number of control channels with a specific signal length that can be determined in the mode defined by the standard protocol, for example the size of the search space is determined according to the number of control channels having the current signal length ; or the size of the search space corresponding to the control channel having the signal length is determined according to an appropriate algorithm; or the size of the respective control channel search space that has the signal length at the same aggregation level is determined by the size of the search space corresponding to all levels of aggregation in the existing LTE system. If one search space is on one carrier of the component, the start position of the search space may be the CCE starting number located in the search space, and the size of the search space may be the amount of CCE in such space. If the CCEs included in the search space have consecutive numbers, the search space can be determined directly, by start position and size. If the CCEs included in the search space do not have consecutive numbers, the search space can be determined on a no-order basis, in addition to the starting position and size. The no-order rule may take into account, for example, that CCE are odd numbers, even numbers, intervals of n or other regular forms. If the search space is on several component carriers, the initial position and size of the search space included on each component carrier is determined in an appropriate way, i.e. the corresponding CCE starting number and the amount of CCE on each component carrier, then CCE is added to obtain the entire search space distributed over several component carriers.

[0039] In the second example, according to the initial search space corresponding to the control channel having the signal length, the search space corresponding to the control channel having the signal length is determined.

[0040] In the second example, a preliminary search space corresponding to the control channel that has the signal length must be determined first, and in one case the search space corresponding to the control channel having the signal length can be obtained in the following steps.

[0041] A preliminary search space corresponding to each component carrier is determined, and a preliminary search space corresponding to a control channel having each signal length and corresponding to the same component carrier constitutes a preliminary search space with the same component carrier.

[0042] At the same time, the initial position of the initial lookup space corresponding to each component carrier may be determined according to a random one or more of: UE ID, space partition, component carrier ID, subframe number or aggregation level. In embodiments of the invention, determining the size of the preliminary search space may include the following steps. The size of the initial search space corresponding to the component carrier is determined by mode

- 18 signal notification, which may change depending on the dynamic signal notification; or the size of the initial search space corresponding to the carrier of the component is determined according to the number of control channels with a specific signal length that can be determined in the mode defined by the standard protocol, e.g. the size of the search space is determined according to the number of control channels having the current signal length; or the size of the initial search space corresponding to the component carrier is determined according to an appropriate algorithm; or the size of the respective initial control channel search space that has the signal length at the same aggregation level is determined by the size of the search space corresponding to all levels of aggregation in the existing LTE system. For example, the initial search space corresponding to the component carrier is configured according to parameters such as the number of control channels corresponding to the component carrier and / or the level of aggregation or determined according to the algorithm defined in the standard protocol. Typically, for each aggregation level, the initial lookup space, corresponding to the control channel that has the signal length and corresponding to each component carrier, is the same as the search space in the existing LTE system. Compared to the LTE lookup space, the control channel initial lookup space, which has a signal length and corresponding to a particular carrier component, e.g., the main carrier, can also be larger, and the preliminary search spaces, corresponding to carriers other than the main carrier, are smaller than LTE system search space; other configurations are also possible which depend on the needs of the system, and the invention is not limited to this aspect.

[0043] In another case, the initial lookup space, corresponding to the control channel, which has a signal length, can be obtained in the following steps.

[0044] In step 1, an initial lookup space is determined corresponding to a control channel that has a signal length and corresponding to each component carrier.

[0045] In step 2, if at least two of the same signal lengths are present in the signal lengths corresponding to the same component carrier, the control channel y having at least two the same signal lengths may use the same initial search space; and / or if at least two different signal lengths occur in signal lengths corresponding to the same component carrier, control channels y having at least two different signal lengths may use different initial lookup spaces in at least one transmission unit.

[0046] At this point, according to the signal length ID or the signal length group ID of the signal u, the initial position of the initial lookup space corresponding to the control channel that has the signal length and corresponds to each component carrier is determined; or according to a random one or more of: signal length ID or signal length group ID and UE ID, control channel format ID, space split, component carrier ID corresponding to the control channel, subframe number or aggregation level, the initial position of the initial space corresponding to the channel is determined control,

- 19 having a signal length and corresponding to each carrier of the component. In embodiments of the invention, determining the size of the preliminary search space may include the following steps. The size of the initial search space corresponding to the control channel with the signal length is determined according to the signal notification mode, which may change depending on the dynamic signal notification; or the size of the initial search space corresponding to the control channel with a signal length is determined according to the number of control channels with a specific signal length that can be determined in the mode defined by the standard protocol, e.g. the size of the initial search space is determined according to the number of control channels having the current signal length; or the size of the initial search space corresponding to the control channel having the signal length is determined according to an appropriate algorithm; or the size of the respective initial control channel search space that has the signal length at the same aggregation level is determined by the size of the search space corresponding to all levels of aggregation in the existing LTE system.

[0047] In yet another case, if a large number of component carriers are scheduled by the UE or as SU-MIMO (multiple-input multiple-output), multi-antenna transmission and subsequent and non-sequential resource allocation are supported, the UE may support control channels that have different signal lengths in each subframe. At the same time, when determining the search space corresponding to the control channel according to the signal length of the control channels corresponding to the component carriers, the component carriers can be grouped, and after grouping the component carriers, the initial search space corresponding to the control channel that has the signal length can be obtained in the following stages.

[0048] A preliminary search space corresponding to each component carrier group is determined, and a preliminary search space corresponding to a control channel having each signal length and corresponding to the same component carrier group is an initial search space with the same component carrier group.

[0049] At the same time, the initial location of the initial lookup space corresponding to each component carrier group may be determined according to a random one or more of: UE ID, space partition, component carrier group ID, subframe number or aggregation level.

[0050] The method of grouping the carrier component may include the following steps. Each carrier pair of uplink and downlink component is divided into groups; or component carriers with the same transmission mode are divided into groups; or component carriers having the same transmission bandwidth are divided into groups; or component carriers having the same number of transmission antennas are divided into groups; or a random combination of the above methods may be used. The invention is not limited to a particular grouping method.

[0051] In the second example, after determining the initial search space corresponding to the control channel that has the signal length, a specific method

- determining a search space corresponding to a control channel having a signal length according to the initial search space includes the following steps.

[0052] If one control channel signal length corresponding to one component carrier differs from one control channel control length corresponding to another one or more component carriers, the search space corresponding to the control channel that has one signal length and corresponds to one component carrier and another one or more carrier component, is completely or partially the same as the initial search space corresponding to the control channel, which has one signal length. The search space corresponding to the control channel having one signal length and the initial search space corresponding to the control channel having one signal length, being partially the same, means: The search space corresponding to the control channel having one signal length is a specific subset of the preliminary search space corresponding to the control channel having the signal length or the amount of CCE is increased or limited according to the subset; and / or [0053] If one control channel signal length corresponding to one component carrier is the same as the control channel signal length corresponding to another or several other component carriers, the UE search space corresponding to the control channel which has one signal length and corresponding to one component carrier and another or several other component carriers, constitutes all or part of the UE search space formed from the initial UE search space, corresponding to a control channel that has one signal length and corresponding to one component carrier and a preliminary UE search space corresponding to a control channel that has one signal length and corresponding to another or several other component carriers. The search space, corresponding to the control channel having one signal length, being part of the search space formed by the initial search space, corresponding to the control channels having signal lengths, means: The search space corresponding to the control channel having one signal length is a specified subset of all preliminary search spaces corresponding to the control channels having the signal length or the amount of CCE is increased or limited according to the subset.

[0054] A method of determining a search space corresponding to a control channel that has a signal length according to a preliminary search space corresponding to a control channel that has a signal length after grouping can be implemented in a similar manner.

[0055] In this embodiment, for the same level of aggregation, the transmission equipment may designate a search space corresponding to the control channel according to the length of the control channel signal, which facilitates the design of the search space, limits the number of blind detections and reduces the number of conflicts between control channels and thus reduces the likelihood of collisions between control channels.

[0056] The detailed analysis is as follows. For example, if control channels corresponding to one or more carrier components have the same signal length, control channels having the same control length may use the same search space, and when the UE performs blind detection of the search space at the level of aggregation, i.e. CCE resources, a single search can determine whether a particular control channel has a signal length. At this time, control channels having a signal length can flexibly use control channel search space with the same signal length, and control channels can be flexibly mapped to space without increasing the number of blind detections, control channel transmission restrictions are reduced, thereby limiting collision probability between control channels. When the signal lengths of the two control channels are the same, the following cases are included. The two control channels have the same format, corresponding to the same component carrier. Alternatively, the two control channels have different formats corresponding to the same component carrier, e.g. the same component carrier has different formats: Format 0 and Format 1A, but has the same signal length. Alternatively, the two control channels have the same format, corresponding to different component carriers, having the same bandwidth. Alternatively, the two control channels have a different format, corresponding to different carrier carriers having the same bandwidth. Alternatively, the two control channels have the same format, corresponding to different carrier carriers having a different number of antennas. Alternatively, the two control channels have a different format, corresponding to different carrier carriers having the same number of antennas. Or additional processing is carried out on two control channels, for example an additional bit is added or a bit indicating some information is skipped (e.g. increased grain allocation of resources) to limit the number of bits used for resource allocation, thus enabling two control channels, having the same format or different formats, had the same signal length. The length of the control channel signal is a key factor that affects the number of blind detections, and the reason for this is that the receiving equipment must perform blind detection at appropriate different signal lengths that may appear in the search space at a possible level of aggregation in the search space, and when control channels having the same signal length use the same search space, The UE performs a single blind detection in the search space to determine whether the search space corresponds to a particular control channel among all control channels that have the same signal length, thereby reducing the number of blind detections and reducing its complexity.

[0057] If the signal lengths of the control channels corresponding to one or more carrier components differ, search spaces corresponding to control channels with different signal lengths are determined, and at the same time the search spaces of control channels having different signal lengths may be different. If the search spaces do not overlap and have the same sizes as the control channels with different signal lengths, detection requires a search space corresponding to the control channel that has any signal length, only the channels

- 22 controls having a corresponding signal length, and thus the likelihood of collisions between control channels will be reduced, without increasing the number of blind detections. Therefore, the collision probability between control channels having different signal lengths is limited and it is ensured that UE control channels can be efficiently scheduled and transmitted, thereby obtaining successful UE data transmission and increasing UE performance without adding further blind detections.

[0058] Fig. 2a shows a diagram for a control channel mapping method according to embodiment 2 of the invention, and Fig. 2b shows another diagram for a control channel mapping method according to embodiment 2 of the invention. As shown in Fig. 2a, search spaces corresponding to control channels having different signal lengths and corresponding to one component carrier are mapped to one component carrier and as shown in Fig. 2b, search spaces corresponding to control channels having different signal lengths and corresponding to multiple component carriers are mapped to one component carrier. Based on the channel mapping method of control according to embodiment 1 of the invention, the control channel may be, for example, PDCCH, and PDCCH is taken as an example to illustrate this and other solutions, although the invention is not limited to PDCCH.

[0059] In this embodiment, one carrier per component may correspond to the length of the N signals for PDCCH, and a PDCCH having the signal length N performs data transmission on one or more carrier carriers corresponding to the UE.

[0060] As shown in Fig. 2a, if the transmission equipment specifies that one UE corresponds to control channels having signal lengths N on one component carrier, for the same level of aggregation, at least two control channels having the same signal length and corresponding to the same component carrier, may use the same search space; and / or respective search spaces are designated respectively for two control channels that have different signal lengths and correspond to the same carrier component to allow at least two control channels having different signal lengths to use different search spaces in at least one transmission unit. For example, PDCCH search spaces that have signal lengths N and corresponding to one carrier of the component are determined independently. For UE3, it is assumed that UE3 corresponds to three PDCCH signal lengths on one component carrier: N = 3, corresponding to the data transmission of one pair of component carrier A (uplink and downlink component A carriers). The transmission equipment may allocate one search space to PDCCH, which has a signal length and corresponds to the data transmission of one pair of components carrier in the control channel area 20 on the carrier component A downlink, and a total of three search spaces are allocated: search space 21, search space 22 and search space 23, where PDCCH having one signal length can only appear in each search space.

[0061] As shown in Fig. 2b, if the transmission equipment determines that control channels having different signal lengths and corresponding to multiple component carriers on one UE,

- 23 have been mapped onto one component carrier, for the same level of aggregation, a suitable search space is determined for at least two control channels having the same signal length and corresponding to another component carriers to allow at least two control channels having the same signal length, used the same search space; and / or respective search spaces are designated for at least two control channels that have different signal lengths and correspond to different component carriers to allow at least two control channels having different signal lengths, to use different search spaces in at least one transmission unit . For example, the transmission equipment performs configuration so that UE3 service data appears on the component carrier pair A and B for transmission purposes and the transmission equipment performs the configuration so that all UE PDCCHs are transmitted on the carrier component A downlink, i.e. scheduling PDCCH corresponding to UE3 data on both downlink carrier A and downlink carrier B appears due to downlink carrier A. For each level of PDCCH aggregation, the transmission equipment may allocate the search space to a control channel that has each signal length in the control channel area on the A downlink carrier. It is assumed that N = 2, two signal lengths X and Y in PDCCH occur on one carrier A of the downlink component, and one signal length X in PDCCH occurs on carrier B of the downlink component, so carrier A of the downlink component and carrier B of the downlink component have the same X signal length. In Fig. 2b, one search space 24 is allocated to PDCCH having the same signal length X on two carriers, and another search space 25 is allocated to PDCCH having a different signal length Y different from X on carrier A of the downlink component. In summary, search spaces, including, for example, search space 24 and search space 25, can be allocated to PDCCH, which has signal lengths and corresponding to multiple carrier components. The amount of CCE included in the two search spaces may be completely different or partly the same or even completely the same, and the differences affect the UE PDCCH collision probability and the PDCCH formats and signal lengths detected in the respective UE search space. In general, attention should be paid to examples of the control channel mapping method according to embodiment 1 of the invention.

[0062] In addition, Fig. 3 is another diagram for a control channel mapping method according to embodiment 2 of the invention. As shown in fig. 3, when the transmission equipment determines that one UE corresponds to the PDCCH signal B lengths on the P component carriers, in one case the N search spaces are allocated to the UE according to each aggregation level in all areas of the P component carrier control channel so that in the respective search space PDCCH appears having each signal length. Otherwise, when the N signal lengths in PDCCH appear on UE P carrier components, the M (M <N) search spaces may be allocated to the UE according to each level of aggregation in all areas of the P carrier carrier control channel, and at least two control channels having signal length,

- 24 match one and the same search space. In fig. 3, P = 2, N = 3, the transmission equipment performs the configuration so that UE4 service data may appear paired carriers A, B and C of the uplink and downlink component for transmission purposes, the transmission equipment also performs the configuration so that the UE4 PDCCH control channel it may be transmitted on the downlink component A carrier and the downlink component B carrier and it is assumed that the scheduled PDCCH UE signal lengths have X, Y and Z signal lengths. For each aggregation level, the transmission equipment may allocate a total of three search spaces on downlink carrier A and downlink carrier B, and each search space may only contain a control channel having a PDCCH signal length, and the amount of CCE included in each search space may be reconfigured by transmission equipment. Two search spaces, i.e. search space 31 and search space 32, corresponding to the X and Y signal lengths in the PDCCH can be configured in the downlink carrier control channel area 30 of the downlink component, and the search space 33 having the Z signal length in the PDCCH can be configured in the area 34 channel at carrier control B downlink component. The CCE numbers in search spaces 31 and 32 may be the same or completely different. In addition to this method, the search space having the Z signal length in the PDCCH may also correspond to the search space 31 in the 30 channel area at the carrier control of the downlink component A, so that the search space having the Z signal length in the PDCCH can be spread to many component carriers, and the above the example not only includes a search space 31 in the downlink carrier control channel area 30 of the downlink component, but also includes search space 33 in downlink carrier control channel area B. In summary, all CCEs can occur on one component carrier, but also on many component carriers.

[0063] In the light of the above, for the level of aggregation, search spaces corresponding to control channels having different signal lengths may occur on one component carrier or on multiple component carriers, and CCE numbers in the search spaces may be sequential or not. If search spaces corresponding to control channels having PDCCH signal lengths are on one component carrier, CCE start numbers and all search space CCE numbers on the same component carrier are obtained to obtain search spaces corresponding to control channels having signal lengths in PDCCH . If search spaces corresponding to PDCCH having PDCCH signal lengths are found on multiple carrier components, CCE numbers included in the search spaces corresponding to each carrier component are obtained, and CCE are added to obtain search spaces corresponding to PDCCH, having PDCCH signal length. If the CCE numbers in the respective search spaces on one component carrier are sequential, according to the CCE starting number of the designated search space and the number of CCEs contained in such search space, all CCE numbers in the search space can be obtained.

[0064] In this embodiment, determining a search space corresponding to a PDCCH having a specific signal length may include the following examples.

[0065] In the first example, the initial position and size of the search space corresponding to the PDCCH having the appropriate signal length is determined.

[0066] The start position of the search space corresponding to the control channel is determined according to the signal length ID or the signal length group ID; or the start position of the search space is determined according to a random one or more of: signal length ID or signal length group ID and UE ID, control channel format ID, space partition, component carrier ID corresponding to the control channel, subframe number or aggregation level. The signal length ID and the signal length group ID may be a system-specific signal length ID, i.e., absolute signal length ID or UE-specific signal length ID, i.e., relative signal length ID; and the component carrier ID corresponding to the control channel may also be the system carrier component ID, i.e. the absolute component carrier ID or component carrier ID, specific to the UE, i.e. the relative component carrier ID.

[0067] The start position of the search space, i.e. the CCE number in the start position, can be determined, for example, as a result of calculations according to UE ID. At the same time, the UE may correspond to different UE IDs on different component carriers, the start location of the lookup space may be calculated using the UE ID such that the start positions of the search space of different component carriers at the same aggregation level are different. The start position of the search space corresponding to the control channel in the k subframe of one UE is calculated by means of the UE ID, for example calculated according to the following formulas (1) and (2):

Y_k = (Αχ Y_k_,) modD (1) = Lx [Y_kModlna_{CTe k} -r L_ |] (2).

[0068] In the above formulas (1) and (2), A may be for example 39827; D may for example be 65537; the iterative value of Yk can be seen as an iterative value that changes the k number of the subframe, and when k = 0, Y-1 is the iterative initial value, where the iterative initial value is essentially the UE ID allocated to the UE by the system or referring to (C- RNTI) (cell radio network temporary identifier) ​​of the corresponding nRNTI and the iterative initial value is other than 0; L is the level of aggregation; NCCE, k is the total amount of CCE to control the transmission of the system control channel in the k-th subframe; the iterative Yk value of the current subframe is obtained by assuming the product module of the iterative Yk-1 value of the previous subframe multiplied by the constant A in relation to D so that the iterative Yk value of the current subframe is the result obtained by iterative operation on the values

- 26 iterative previous subframes (Q-1); mod means the act of being included in the module; and Zk is the start position of the search space corresponding to the control channel if the system allocates the control channel at the aggregation level L to the UE with the nRNTI ID UE in the k-th subframe.

[0069] The transmission equipment allocates different UE IDs to different UEs and the UE IDs are not only used to identify different UEs in the same cell, but also have the function of randomizing the start position of the search space when the UE calculates the search space. The randomization method may also to some extent randomize the distribution of search spaces corresponding to control channels between UEs to limit the collision of control channels between UEs.

[0070] In addition to determining the CCE start number of the search space as a result of calculations, the UE ID can also determine the amount of CCE at the start position of the search space, along with the length of the ID signal, and above all, the length of PDCCH signal supported by the UE in the current subframe can be identified. Because different UEs support different amounts of PDCCH signal length, the IDs adopted for the same PDCCH signal length may also be different, thus having UE specific characteristics and depending on the ID of the signal length adopted by the UE. All PDCCH signal lengths supported in the system can also be identified in absolute terms, with the PDCCH signal length ID corresponding to UE PDCCH signal lengths being taken. The UE-specific signal length ID in PDCCH is used to distinguish search spaces corresponding to PDCCH having different signal lengths, and different PDCCH signal lengths corresponding to the same UE have different signal length IDs in PDCCH. For example, the starting position can be calculated from the following formulas (3) and (4):

Y_k = (ax Y_k_, χ M _kp ) modD (3)

FROM_k = L x [Y_k mod [N_{ccc k} ? LJj (4).

[0071] In the above formulas (3) and (4), Mk, p is the ID of the PDCCH signal length, corresponding to the signal length of the p-th control channel in the subframe ki Mk, p is different from 0; the meanings of the parameters are the same as for formulas (1) and (2).

[0072] From the above two examples, it follows that a parameter different from the UE ID, e.g. signal length ID or component carrier ID, will be entered to calculate the CCE start number of the search space, which theoretically corresponds to using a different UE ID in the current subframe. When Yk in a given subframe equals Yk, corresponding to another UE ID in time, as a parameter entered, for example, signal length ID or component carrier ID, it does not change dynamically in the subframe, e.g. the component carrier ID corresponding to UE changes in a way semi-static, when Yk, corresponding to two users are equal in a given subframe, Yk remains equal in subsequent subframes, so there is a collision between the control channels of two users. In one solution, the allocation of the next EU ID, which

- 27 makes the parameters equal, comes to an end, which affects the way the EU ID is allocated. In another solution, for Mk, p, no multiplication is assumed (for example, an additional association) so that there are no continuous collisions in random subframe changes.

[0073] Because when determining the start position of the lookup space, using the PDCCH signal length ID, the entire amount of CCE allocated to the control channel can be involved, in this embodiment all CCEs allocated to the control channel can be split, then the marked CCE is divided in space to additionally determine the starting position of the search space. For example, the amount of all CCE allocated to PDCCH is 100, so when the PDCCH signal length ID is used for calculations to prevent the result from exceeding 100 CCE, the calculation result can be limited to 100 CCE, assuming for example a result module with 100 In this regard, the starting position of the search space obtained by calculating the signal length ID of different PDCCHs may be the same. To further avoid overlap of search spaces corresponding to control channels having different signal lengths of one UE, all CCEs can be divided into two groups, i.e. the entire search space allocated to PDCCH is divided into two. In this way, the fact that part of the search space can only be in the first space obtained by partitioning is limited, and the remaining search space can be present only in the second space obtained by partitioning. To further avoid collisions between control channels, the search space can be divided by number or PDCCH signal length classification. For example, if there is a total of N PDCCH signal lengths in total, the entire search space allocated to the control channel is divided by N, so that the search space of each PDCCH signal length can only be allocated in the corresponding dedicated space; due to this, CCE included in search spaces corresponding to PDCCHs having different signal lengths do not overlap and without changing the number of blind detections, PDCCH mapping areas of many signal lengths corresponding to one UE are different, which limits collisions between control channels. One CCE may also be allocated to PDCCHs having multiple signal lengths so that the CCEs included in the search spaces corresponding to PDCCHs having specific signal lengths overlap. For example, the start position of the search space corresponding to the control channel in the k subframe of one UE may be calculated based on the following formulas (5) and (6):

Y_k - (A * Y_k_,) mod D (5)

FROM_k = Lx [Y_kPray (NxN_cctk) -! - (NxL) J] (6).

[0074] In the above formulas (5) and (6), N is the amount of space separated from the entire space of the control channel; n is the signal length of the nth control channel, generally n <N; the meaning of the parameters is the same as for formulas (1) and (2).

[0075] The size of the search space is the amount of CCE included in the search space that can be constant or variable. The size of the search space corresponding to the control channel of the signal length is determined according to the signal notification mode, which, for example, changes dynamically with the signal; or the size of the initial search space corresponding to the control channel with the signal length is determined according to the number of control channels that can be determined in the mode defined by the standard protocol, for example the size of the search space is determined according to the number of control channels having the current signal length; or the size of the search space corresponding to the control channel having the signal length is determined according to an appropriate algorithm; or the size of the control channel search space that has the signal length at the same aggregation level is determined by the size of the search space corresponding to all levels of aggregation in the existing LTE system.

[0076] In the second example, according to the initial search space corresponding to the control channel having the signal length, a search space corresponding to the control channel having the signal length is determined and reference may be made to the description of embodiment 1 of the invention to obtain information on specific cases or stages. For example, fig. 4 is a diagram for a method of determining a search space for a control channel in a method for mapping a control channel according to embodiment 2 of the invention. As shown in fig. 4, the component carrier S pair contains the downlink component S carrier and the corresponding uplink component S carrier, the component carrier S pair corresponds to signal lengths A and C, and the initial search space corresponding to control channels that have two signal lengths A and C corresponds to the area of label 41 in the S downlink carrier S (PDCCH S carrier); the component carrier T pair contains the downlink component T carrier and the corresponding uplink component carrier T, the uplink component carrier T corresponds to signal lengths A and B, and the initial search space corresponding to control channels that have two signal lengths A and B corresponds to the region of label 42 in the T carrier of the downlink component (T PDCCH carrier). Both the signal length C corresponding to the component carrier pair S and the signal length B corresponding to the signal carrier pair T are the unique signal lengths so that the search spaces corresponding to the control signal channel length C and corresponding to the component carrier signal pair S and the signal length control channel B and the corresponding carrier carrier pair T are completely or partly the same relative to the respective preliminary search spaces, for example, the size of the search space corresponding to the control channel with signal length C and corresponding to the component carrier pair S is the initial search space 41 for S, and the size of the search space corresponding to the control channel with signal length B and corresponding to the component carrier pair T is the initial search space 42 for T. In addition, the signal length A corresponding to the component carrier pair S is the signal length A corresponding to the signal carrier pair T and the search spaces corresponding to the control channels with signal length A and corresponding component carrier pair S and the signal length A corresponding to pair T the carrier component may be such

The same, and the size of the search space may be such that: The search space, corresponding to the control channel that has one signal length A, may be part or all of the initial search space having the signal length A, corresponding to the carrier carrier S and T of the component. For example, if all preliminary search spaces are adopted, and above all represented as a universal set of preliminary search spaces corresponding to search spaces corresponding to control channels having signal length A and corresponding to component carrier S and signal length corresponding to component carrier T , i.e., preliminary search space 41 and initial search space 42. In addition, a control channel with the signal length A and corresponding to the carrier carrier pair S, which is part of the initial search space having the signal length A, corresponding to the carrier carrier carrier pair T, means that: The amount of CCE can be increased or limited, according to the initial space search corresponding to a specific subset of control channels that have control length A. The method of determining the initial search space may include the following cases. In one of them, the initial search space corresponding to each component carrier is determined, and the initial search space corresponding to the control channel having each signal length and corresponding to the same component carrier constitutes the initial search space with the same component carrier. At the same time, the initial location of the initial search space corresponding to each component carrier may be determined according to a random one or more of: UE ID, space partition, component carrier ID, subframe number or aggregation level. Otherwise, an initial lookup space is determined corresponding to a control channel that has a signal length and corresponds to each component carrier. If at least two of the same signal lengths occur in signal lengths corresponding to the same component carrier, control channels having at least two the same signal lengths may use the same initial search space; and / or if at least two different signal lengths occur in signal lengths corresponding to the same carrier component, control channels having at least two different signal lengths may use different initial lookup spaces in at least one transmission unit. At this point, according to the signal length ID or the group length signal ID u, the initial position of the initial search space corresponding to the control channel that has the signal length and corresponds to each component carrier is determined; or according to a random one or more of: signal length ID or signal length group ID and UE ID, control channel format ID, space split, component carrier ID corresponding to the control channel, subframe number or aggregation level, the initial position of the initial space corresponding to the channel is determined a control having a signal length and corresponding to each component carrier. In yet another embodiment, after the component carrier grouping, an initial search space is determined corresponding to each component carrier group, and the initial search space corresponding to the control channel having each signal length and corresponding to the same component carrier group constitutes the initial space

- 30 searches with the same carrier group of the component. At the same time, according to a random one or more of: UE ID, space partition, component carrier group ID, subframe number or aggregation level, the initial position of the initial search space corresponding to the component carrier group is determined. You can refer to formulas (1) to (6) and a description of a specific method of determining the initial position of the initial search space, so that the method can be implemented by modifying only the relevant parameters. In addition, reference may also be made to the description of embodiment 1 according to the invention for information on grouping of component carriers.

[0077] Furthermore, in this embodiment, for each aggregation level, the CCEs included in the search spaces corresponding to the control channels, determined according to the signal length of the control channels, may be sequential or non-sequential and spread over one carrier or multiple carriers. In the case of non-consecutive CCEs, the principle of non-consecutive CCEs is adopted.

[0078] Furthermore, in this embodiment, for each level of aggregation, the position ratios between the designated control channels, which have different signal lengths, may be sequential or non-consecutive and may not overlap at all, partially or completely overlap.

[0079] In this embodiment, once the respective control channel search spaces corresponding to the component carriers have been determined, the position ratios between the search spaces may be determined according to the length of the control channel signals, which include the following examples.

[0080] In the first example, if the lengths of the control channel signals corresponding to different carrier components are the same, this means that the search spaces suitable for the carrier components having the same signal length overlap completely or partially, and the control channel comprises carrier indication information to indicate the various carriers of the component.

[0081] If the search spaces overlap completely, the start positions of the search spaces corresponding to the carrier component having the same signal length of the respective control channel are the same and the size of the search space are also the same; wherein, when the search spaces overlap, the search spaces corresponding to the component carriers having the same signal length corresponding to the control channel have at least the same CCE. If the signal lengths of the control channels corresponding to the component carriers having completely or partially overlapping search spaces are the same, overlapping search spaces can significantly reduce the number of blind detections. For example, when the data transmission modes of the A and B pair of uplink and downlink components are the same, the signal lengths of the respective PDCCH for scheduling the data transmission on each pair of carriers are the same, at this time, preferably the amount of CCE included in the two search spaces is completely same; in that case, it may be considered to be present

- only one search space, PDCCH corresponding to two carriers, can be in any position in the search space, thus increasing the flexibility of placing control channels, and the number of blind detections is not increased, because the lengths of PDCCH signals for scheduling multiple carriers are the same. At this point, each PDCCH requires carrier pointer information that will instruct which carrier is scheduled and the carrier pointer information can be implemented thanks to the encryption code of the carrier-specific information or by means of an indication in the PDCCH. It is assumed that the search space corresponding to each level of aggregation is M, and if one transmission mode corresponds to two PDCCH signal lengths, in the search space M, UE requires blind detection for 2M twice. When control channel search spaces having a signal length and corresponding to different carrier components overlap completely or partially, conflicts between control channels can be reduced by increasing the size of the search space. For example, when the aggregation level is 8 CCE and the search space in the existing solution consists of 16 CCE to limit conflicts between control channels, the size of the search space corresponding to the control channel having a signal length can be set to a value above 16 CCE, for example up to 32 CCE.

[0082] In the second example, if the control channels corresponding to different component carriers have different signal lengths, this means that the search spaces corresponding to the component carriers having different signal lengths do not overlap.

[0083] For example, when the data transmission modes of the carrier pair A and B of the uplink and downlink component are not the same, that is, the signal lengths of the respective PDCCH for scheduling data transmission on each component carrier pair may be different, each component carrier pair it is configured to meet its own transmission characteristics, and each component carrier pair has several different signal lengths for PDCCH. At the same time, preferably, the CCE numbers included in the two search spaces are completely different; in such cases, both A and B component carrier pairs may be considered to have appropriate independent search spaces corresponding to control channels that have carrier signal lengths, and PDCCH corresponding to two component carrier pairs may appear in the appropriate search spaces for purposes of transmission. Therefore, PDCCH does not require any information indicating which component carrier pair is scheduling, and information about a particular search space for a component carrier pair indicates which component carrier is scheduled, thus limiting the number of signals in the PDCCH. It is assumed that one search space corresponding to each level of aggregation is M. If the transmission mode corresponds to two PDCCH signal lengths, in the M search space, the UE requires blind M-times detection in each search space; while in the two search spaces, the UE requires better detection of M + M = 2M times in total. If the search spaces do not overlap, the number of blind detections does not decrease; however, the size of the search space may be appropriately limited or maintained at the same level as for the LTE system.

[0084] If, for the same level of aggregation, the search spaces corresponding to the control channels of the different carrier components do not overlap, information indicating the component carrier, e.g. identification information or carrier index, can no longer be transmitted. The reason for this is that for the same level of aggregation, search spaces of different component carriers do not overlap, so when the UE detects PDCCH in a particular search space, the UE learns that PDCCH corresponds to the component carrier corresponding to the search space. If, for the same level of aggregation, the search spaces corresponding to the same control channels of the different component carriers overlap partly or completely overlap, the component carrier identification information must be sent, so the UE learns which component carrier is affected by the PDCCH detected by the UE in the specified search space .

[0085] In the third example, it was determined that the search spaces, corresponding to the control channels, which have a signal length and corresponding to the carrier component, overlap partly.

[0086] The method in the first example can be used to create search spaces corresponding to control channels having signal lengths and corresponding carrier components that will overlap only partially, while reducing collisions between control channels and to some extent blind detection. In addition, in the third example, search spaces corresponding to control channels having two identical signal lengths or different signal lengths can be determined, i.e. the search spaces are independent and have no dependencies or rules. For example, search spaces corresponding to control channels having two different signal lengths may be appropriately determined according to different signal length IDs corresponding to two different signal lengths, or correspondingly determined according to the carrier ID of control channel components having two different signal lengths or determined by one or a combination of the above; and / or search spaces corresponding to control channels having different / the same signal length IDs, corresponding to two different / the same signal lengths or correspondingly designated according to the carrier carrier ID of the control channel component having two different / the same signal lengths or determined according to any one or a combination of the above. In summary, the selection of specific ID parameters is not limited to the illustrated embodiments of the invention. Search spaces corresponding to control channels having two the same signal lengths or different signal lengths may be the same or different, i.e., search spaces corresponding to control channels having signal lengths and corresponding carrier components may overlap, depending on since the randomization of the search space determination parameter, affecting the method of determining the search space or based on an independent method of determining, and the invention is not limited to this aspect.

[0087] Furthermore, the transmission equipment may determine a search space corresponding to control channels having at least one predetermined signal length and corresponding UE to preferably detect the search space, and determine a search space corresponding to control channels having an indefinite signal length and corresponding UE so that you can additionally detect the search space. Since the component carrier carrying the control channel can preferably be selected as the UE main carrier, the main carrier is the component carrier requiring continuous detection by the UE, i.e. in connected state and the main carrier has relatively good channel conditions so that the PDCCH corresponding to the UE has good transmission parameters, PDCCH signal lengths, corresponding to the main carrier, serve as specific signal lengths, and the search space, corresponding to the control channel, have the signal length of the PDCCH and corresponding to the main carrier, is set as a search space that will preferably be detected. In addition, a search space corresponding to control channels having PDCCH signal lengths, which may appear more times with a higher degree of probability, is designated as a search space that will preferably be detected, and a search space corresponding to control channels that have other PDCCH signal lengths , it is designated as a search space that will be additionally detected. The method of determining search spaces that are preferably detected and search spaces that are additionally detected, and information about, for example, signal length and formats included in the search space, which is preferably detected, and the search space, additionally detected, are specified in the protocol and can be clearly obtained by the receiving and transmitting side using algorithms in the standard protocol or transferred to the receiving equipment by the transmission side, thanks to a dedicated signal containing a semi-static upper layer signal, a dynamic signal of the physical layer and a media access control layer.

[0088] The transmission equipment preferably schedules a control channel that has a PDCCH signal length and corresponding to a main carrier or preferably schedules a control channel having a PDCCH signal length that appears more times more likely or preferably schedules a control channel having a PDCCH signal length determined in other data transmission modes. In addition, the preferably detectable search space and the additionally detected search space may or may not overlap, and if they do not overlap, at the aggregation level, the search space corresponding to control channels having PDCCH signal lengths is formed from all CCE numbers of the space preferably detecting search and additionally search space; if they overlap, a search space corresponding to control channels having a PDCCH signal length is formed of all CCEs included in the search space preferably discovered or in the search space additionally detected.

[0089] In LTE, for some UEs requiring monitoring of control channels, blind detection in the public search space is necessary,

- 34 corresponding to at least one carrier of the component. Therefore, when the public search space has residual CCE resources for mapping and transmission, only one UE PDCCH may appear in the public search space for transmission purposes. At this time, when the public search space has no residual CCE resources for UE PDCCH mapping and transmission, only one or more PDCCHs that have PDCCH signal lengths and corresponding UE main carrier or PDCCH signal lengths that appear more times, more likely , appear in a search space preferably detected for transmission purposes; and if other PDCCH signal lengths still exist, PDCCHs having different PDCCH signal lengths will appear in the search space, additionally detected for mapping and transmission purposes.

[0090] In this embodiment, the transmission equipment may allocate multiple search spaces on one or more downlink component carriers, according to the signal length of many control channels corresponding to PUSCH, scheduled by multiple uplink carriers and / or PDSCH scheduled by multiple downlink component carriers. In the allocated search space, the control channel having any signal length can be mapped, and in the case of transmission equipment, the search space is a CCE area in which the transmission equipment can map PDCCH; in the case of receiving equipment, the search space is the CCE area determined according to the blind detection of control channels by the receiving equipment. Transmission equipment may allocate independent search spaces to control channels that have each / multiple formats, according to the types of signal length of control channels that the UE may transmit over a period of time, search spaces may be allocated on one or more component carriers, and search space sizes may be configured according to the appearing value and / or probability of each signal length, corresponding to the UE or can be changed according to the initial search space corresponding to each component carrier so that the search space corresponding to the control channel having each signal length and the amount of CCE included in the search space corresponding to the PDCCH can be changed according to the requests of one or more carriers component. For example, when the amount and / or probability of a PDCCH having a certain signal length is high, the amount of CCE included in the corresponding search space increases, so the number of control channels for the purposes of transmission that can be captured increases, and the probability of collision during transmission control channels with other UEs are reduced. On the other hand, when the appearing amount and / or probability of a PDCCH having a certain signal length is small, the amount of CCE contained in the corresponding search space decreases, so the resources for the need for control channel transmission are small, reducing the number of blind detections implemented by the UE on control channels, reducing the complexity of processes in the EU, reducing battery consumption.

[0091] In this embodiment, the component carrier may also be replaced by a component carrier pair, component carrier group, component carrier set or component carrier pair, while the component carrier ID may be replaced by component carrier pair ID, component carrier group ID, file ID component carrier or carrier pair ID

- 35 ingredient. Therefore, the component carrier description also applies to the component carrier pair, component carrier group, component carrier set or component carrier pair. For example, in the presence of multiple component carriers, to limit the amount of search space and UE detection complexity, the component carriers or component carrier pair can be grouped, and each group is a component carrier set. At the same time, the component carrier can be replaced with the component carrier sets.

[0092] Fig. 5 is a diagram for a method of detecting a control channel according to embodiment 3 of the invention. As shown in Fig. 5, the control channel detection method comprises the following steps.

[0093] In step 51, for the same level of aggregation, according to the length of the signal on the control channel corresponding to the component carrier, an appropriate search space is determined for at least two channels with the same signal length to allow at least two control channels with the same signal length using the same search space.

[0094] In step 52, control channels having signal lengths included in the same search space are detected in the determined, same search space.

[0095] Allowing two control channels having the same signal length to use the same search space includes: allowing at least two control channels that have the same signal length and correspond to different component carriers to use the same search space; or allowing at least two control channels that have the same signal length and correspond to the same carrier component to use the same search space.

[0096] Steps 51 and 52 relate to a method in which at least two control channels that have the same signal length occur in one or more component carriers, and when at least two control channels that have different signal lengths occur in of one or more carrier components, steps 51 and 52 may be sequential stages or implemented together with the subsequent stages.

[0097] In the case of the same level of aggregation, according to the length of the signal on the control channel corresponding to the component carrier, the respective search spaces are determined for at least two channels with the same signal length to allow at least two control channels different signal length utilizing a different search space in at least one transmission unit; in designated search spaces, control channels are detected having signal lengths included in different search spaces.

[0098] Designating appropriate search spaces for at least two channels having different signal lengths to allow at least two control channels with different signal lengths to use different search spaces in at least one transmission unit includes: determining appropriate search spaces for at least two control channels with different signal lengths and which

- 36 correspond to different component carriers to allow at least two control channels of different signal length to use different search spaces in at least one transmission unit; or determining appropriate search spaces for at least two control channels having different signal lengths and corresponding to the same component carrier to allow at least two control channels with different signal lengths to use different search spaces in at least one transmission unit.

[0099] When the UE discovers the control channels, the method of determining the search space corresponding to the control channel according to the length of the control channel signal corresponding to the component carrier includes in particular the following examples.

[0100] In the first example, the UE determines the start position and size of the search space corresponding to the control channel. The way the UE determines the start position of the search space corresponding to the control channel is as follows. According to the signal length ID or the signal length group ID, the start position of the search space corresponding to the control channel is determined; or according to a random one or more of: Signal length ID or signal length group ID and UE ID, control channel format ID, space split, component carrier ID corresponding to the control channel, subframe number or aggregation level, the start position of the search space corresponding to control channel. First of all, reference can be made to the description of determining the starting position and size of the search space in Examples 1 and 2 of the invention.

[0101] In the second example, the UE designates a search space corresponding to a control channel that has a signal length according to a preliminary search space corresponding to a control channel having a signal length.

[0102] The method of UE determining the initial lookup space corresponding to the control channel that has the signal length may include the following steps.

[0103] In one case, the initial lookup space corresponding to the control channel that has the signal length is obtained in the following steps.

[0104] The initial search space corresponding to each component carrier is determined, and the initial search space corresponding to the control channel having each signal length and corresponding to the same component carrier constitutes the initial search space with the same component carrier.

[0105] At the same time, according to a random one or more of: UE ID, space partition, component carrier ID, subframe number or aggregation level, a preliminary search space corresponding to each component carrier is determined.

[0106] Otherwise, the initial lookup space corresponding to the control channel that has the signal length is obtained in the following steps.

[0107] In step 1, an initial lookup space is determined corresponding to a control channel that has a signal length and corresponding to each carrier of the component.

[0108] In step 2, if at least two of the same signal lengths are present in the signal lengths corresponding to the same component carrier, the control channel y having at least two the same signal lengths may use the same initial search space; and / or if at least two different signal lengths occur in signal lengths corresponding to the same component carrier, control channels y having at least two different signal lengths may use different initial lookup spaces in at least one transmission unit.

[0109] At the same time, the start position of the initial lookup space corresponding to the control channel having each signal length and corresponding to each component carrier can be determined according to the signal length ID or the signal length group ID; or the initial position of the initial search space corresponding to the control channel having each signal length and corresponding to each component carrier is determined according to a random one or more of: signal length ID or group signal length ID and UE ID, control channel format ID, space division, ID component carrier corresponding to the control channel, subframe number, or aggregation level.

[0110] In yet another case, if the component carriers are grouped, a preliminary search space corresponding to a control channel that has a signal length is obtained in the following steps.

[0111] The initial search space corresponding to each component carrier group is determined, and the initial search space corresponding to the control channel having each signal length and corresponding to the same component carrier group is the initial search space with the same component carrier group.

[0112] At the same time, according to a random one or more of: UE ID, space partition, component carrier group ID, subframe number or aggregation level, a preliminary search space corresponding to each component carrier group is determined.

[0113] After the UE has determined the initial search space corresponding to the control channel that has the signal length, the determined method for determining the search space corresponding to the control channel having the signal length according to the initial search space corresponding to the control channel having the signal length is as follows.

[0114] If one control channel signal length corresponding to one component carrier differs from one control channel control length corresponding to one or more component carriers, the search space corresponding to the control channel that has one signal length and corresponds to one component carrier, and another one or more carrier component, is completely or partially the same as the initial one

- 38 search space corresponding to a control channel that has one signal length; and / or [0115] If one control channel signal length corresponding to one component carrier is the same as the control channel signal length corresponding to another or several other component carriers, the UE search space corresponding to the control channel which has one signal length and corresponding to one component carrier and another or several other component carriers, constitutes all or part of the UE search space formed from the initial UE search space, corresponding to a control channel that has one signal length and corresponding to one component carrier and a preliminary UE search space corresponding to a control channel that has one signal length and corresponding to another or several other component carriers. The search space, corresponding to the control channel having one signal length, being part of the search space formed by the initial search space, corresponding to the control channels having signal lengths, means: The search space corresponding to the control channel having one signal length is a specified subset of all preliminary search spaces corresponding to the control channels having the signal length or the amount of CCE is increased or limited according to the subset.

[0116] After determining the appropriate control channel search space according to signal length, the UE may perform, in the designated search space, blind detection on control channels with signal lengths included in the search space.

[0117] Also, in the control channel mapping method, the control channel that has a specific signal length is mapped to the search space so that it is preferably detected, and control channels that have indefinite signal lengths are mapped to the search space that will be additionally detected. Accordingly, if there are preferably control channels with a specific signal length in the search space to be detected, this is detected regardless of whether control channels with unspecified signal lengths are present in the search space to be additionally detected; otherwise, it will not be detected, regardless of whether control channels with an indefinite signal length are present in the search space to be additionally detected.

[0118] Especially during blind detection of control channels by the UE, in addition to detecting the public search space, first of all it can be determined whether the signal length corresponding to the UE exists in the search space to be preferably detected. If the UE detects a control channel with the UE signal length alone in the preferably discovery search space, the UE continues detection in the additionally detected search space, which is interrupted only when blind detection is performed on all search spaces requiring detection. If the UE does not detect a control channel with the UE signal length alone in the preferably search space, the UE will not continue

- 39 detection in the search space additionally detected and the detection is coming to an end.

[0119] In this embodiment, the control channel may be, for example, PDCCH, but the invention is not limited to the control channel, which is PDCCH. The description regarding the length of the control channel signal as an example in this case also applies to the format set or the set of control channel signal lengths.

[0120] In this embodiment, the UE may determine the start position and size of the search space according to the control channel having the signal length, and then perform detection in the designated search space. Because the initial position and size of the search space can be configured flexibly on the network side, the probability of collision between control channels is limited. In addition, distinguishing the search space preferably detected from the search space additionally detected, the UE may not be able to perform unnecessary blind detections in all search spaces, thereby limiting the number of blind detection of control channels by the UE to further reduce energy consumption by the UE and avoid excessive detection errors blind.

[0121] Fig. 6 is a diagram of transmission equipment according to embodiment 3 of the invention. As shown in Fig. 6, the transmission equipment includes a first processing module 61 and a second processing module 62. The first processing module 61 includes a first search space design module 611 and a first mapping module 612. The first search space designator 611 is configured so that for the same level of aggregation, according to the length of the control channel signal corresponding to the component carrier, for at least two channels with the same signal length designate an appropriate search space to allow at least two control channels to same signal length, use the same search space. The first mapping module 612 is configured to map at least two control channels that have the same signal length to the respective search space determined by the first search space determination module 611.

[0122] The second processing module 62 includes a second search space module 621 and a second mapping module 622. The second search space designator 621 is configured so that for the same level of aggregation, according to the length of the control channel signal corresponding to the component carrier, the respective search spaces are determined for at least two channels with the same signal length to allow at least two control channels with different signal length, use of a different search space in at least one transmission unit. The second mapping module 622 is configured to map at least two control channels that have a different signal length to the respective search space determined by the second search space determination module 621.

[0123] Furthermore, the first search space designating module 611 may include a first determining unit 6111 or a second determining unit 6112.

[0124] The first determining unit 6111 is configured so that for the same level of aggregation, according to the length of the control channel signal corresponding to the component carrier, for at least two channels with the same signal length, determine a suitable search space to allow at least two control channels with the same signal length, corresponding to different carrier components, using the same search space. The second determining unit 6112 is configured to determine, for the same level of aggregation, according to the length of the control channel signal corresponding to the component carrier, for at least two channels with the same signal length to allow at least two control channels of the same signal length, corresponding to the same component carrier, using the same search space.

[0125] The second search space design module 621 includes a third determining unit 6211 or a fourth determining unit 6212.

[0126] The third determining unit 6211 is configured to determine appropriate search spaces for at least two control channels having different signal lengths and corresponding to different component carriers to allow at least two control channels having different signal lengths to use different search spaces in at least one transmission unit. The fourth determining unit 6212 is configured to determine appropriate search spaces for at least two control channels having different signal lengths and corresponding to the same carrier component to allow at least two control channels having different signal lengths to use different search spaces in every at least one transmission unit.

[0127] Furthermore, the first search space module 611 and / or the second search space module 621 further includes a position determination unit 63 and / or a preliminary search space unit 64. The position determining unit 63 is configured to determine the start position and size of the search space corresponding to the control channel. The initial search space unit 64 is configured to define a search space corresponding to a control channel that has a signal length according to the preliminary search space corresponding to a control channel having the signal length.

[0128] The position determining unit 63 includes a starting position determining subunit 631.

[0129] The start position determination subunit 631 is configured to determine the start position of the lookup space corresponding to the control channel according to the signal length ID or the signal length group ID; or according to a random one or more of: Signal Length ID or Signal Length Group ID and UE ID, Control Channel Format ID, Space Division, Component Carrier ID

- 41 control channel, subframe number or aggregation level, determine the start position of the search space corresponding to the control channel. Additionally, for information on the method, reference may be made to the description of embodiments 1 and 2 of the invention.

[0130] The preliminary search space unit 64 includes the first preliminary search space subunit 641 and the preliminary search space subunit 642 or the third preliminary search space subunit 642, and further includes the fourth preliminary search space subunit 644.

[0131] The first preliminary search space sub-unit 641 is configured to designate the initial search space corresponding to each component carrier, and the initial search space corresponding to the control channel having each signal length and corresponding to the same component carrier constitutes the initial search space of such component carrier itself.

[0132] The second subunit 642 of the initial search space is configured to designate the initial search space corresponding to the control channel having each signal length and corresponding to each component carrier in which if at least two of the same signal lengths occur in the signal lengths corresponding to the same carrier component, control channels, having at least two the same signal lengths can use the same initial search space; and / or if at least two different signal lengths occur in signal lengths corresponding to the same carrier component, control channels having at least two different signal lengths may use different initial lookup spaces in at least one transmission unit.

[0133] The third search subunit 643 is configured to designate the initial search space corresponding to each component carrier group after grouping the component carriers, and the initial search space corresponding to the control channel having each signal length and corresponding to the same component carrier group , is the initial search space with the same carrier group of the component.

[0134] The fourth subunit 644 of the initial search space is configured such that if the length of the control channel signal corresponding to one carrier of the component is different from one length of the control channel signal corresponding to another one or more carriers to make the search space corresponding to the control channel , having one signal length and corresponding to one component carrier and another one or more component carriers, was completely or partially the same as the initial search space corresponding to the control channel having one signal length; and / or if one control channel signal length corresponding to one component carrier is the same as the control channel signal length corresponding to another or several other component carriers, the UE search space corresponding to the control channel which has one signal length and corresponds to one carrier component and

- the other or more other carrier component, constitutes all or part of the UE search space, formed from the UE initial search space, corresponding to a control channel that has one signal length, and corresponding to one component carrier, and the initial UE search space, corresponding to the control channel that has one signal length and corresponding to another or several other carrier component.

[0135] Particularly, the method of determining the initial search space by the initial search space unit 64 according to the initial search space corresponding to a control channel that has a signal length may include the following cases.

[0136] In the first case, the first subunit 641 of the initial search space designates an initial search space corresponding to each component carrier, and the initial search space corresponding to a control channel having each signal length and corresponding to the same component carrier constitutes a preliminary search space of such component carrier itself.

[0137] At the same time, the start position of the initial lookup space corresponding to each component carrier may be determined according to a random one or more of: UE ID, space partition, component carrier ID, subframe number or aggregation level.

[0138] In the second case, the second preliminary search sub-unit 642 designates an initial search space corresponding to the control channel having each signal length and corresponding to each component carrier in which if at least two of the same signal lengths occur in signal lengths corresponding to the same component carrier, control channels, having at least two the same signal lengths can use the same initial search space; and / or if at least two different signal lengths occur in signal lengths corresponding to the same carrier component, control channels having at least two different signal lengths may use different initial lookup spaces in at least one transmission unit.

[0139] At the same time, the start position of the initial lookup space corresponding to the control channel having each signal length and corresponding to each component carrier can be determined according to the signal length ID or the signal length group ID; or the initial position of the initial search space corresponding to the control channel having each signal length and corresponding to each component carrier is determined according to a random one or more of: signal length ID or group signal length ID and UE ID, control channel format ID, space division, ID component carrier corresponding to the control channel, subframe number, or aggregation level.

[0140] In the third case, the third subunit 643 of the initial search space designates an initial search space corresponding to each carrier group of the component, and the initial search space corresponding to the control channel,

- having each signal length and corresponding to the same carrier component is the initial search space with the same carrier group of the component. In the third case, the transmission equipment may further include a grouping unit configured to group the component carriers. The grouping method includes, but is not limited to, dividing each uplink and downlink carrier pair into groups; or dividing the component carriers having the same transmission mode into groups; or dividing the component carriers having the same bandwidth into groups; or dividing component carriers having the same number of transmission antennas into groups.

[0141] At the same time, the start position of the initial lookup space corresponding to each component carrier group may be determined according to a random one or more of: UE ID, space partition, component carrier group ID, subframe number or aggregation level.

[0142] In this embodiment, reference may be made to Embodiment 1 and 2 of the invention for information on a particular method of determining an initial search space corresponding to a control channel having a signal length by means of a unit of the preliminary search space.

[0143] After the initial search space unit 64 determines the initial search space corresponding to the control channel that has the signal length, the fourth sub-unit 644 of the initial search space corresponding to the control channel having the signal length according to the initial search space corresponding to the channel control having a signal length includes the following steps.

[0144] If one control channel signal length corresponding to one component carrier differs from one control channel control length corresponding to another one or several component carriers, the search space corresponding to control channels that have one signal length and corresponding to one component carrier and another one or more carrier component, is completely or partly the same as the initial search space corresponding to the control channel, which has one signal length.

[0145] Alternatively, if one control channel signal length corresponding to one component carrier is the same as a control channel signal length corresponding to another or several other component carriers, a UE search space corresponding to a control channel that has one signal length and corresponding to one carrier of the component and another or several other carrier of the component, constitutes all or part of the UE search space, formed from the UE's preliminary search space corresponding to a control channel that has one signal length and corresponding to one component carrier and the UE's preliminary search space that corresponds to a control channel that has one signal length and corresponding to another or more other component carriers. Additionally, for information on the method, reference may be made to the description of embodiments 1 and 2 of the invention.

[0146] Furthermore, the first search space designating module 611 and / or the second search space designating module 612 are configured to determine a search space corresponding to a control channel of a predetermined signal length as a preferably detected space and designate a space corresponding to a control channel, which has no specific signal length, as a search space, additionally detected.

[0147] For the same level of aggregation, the transmission equipment provided in the embodiment may designate different search spaces, according to the length of the control channel signal, thereby limiting conflicts between the control channels. In addition, transmission equipment may cause search spaces corresponding to control channels having the same signal length to overlap in whole or in part, thereby limiting the number of blind detections implemented by the UE; or causing the search spaces corresponding to control channels having other signal lengths to not overlap to clearly send the signal length corresponding to the search space to the UE, thus limiting the number of signals. The transmission equipment may additionally map a designated search space corresponding to a control channel that has a signal length to a search space preferably detected to enable the UE to advantageously detect control channels in a designated search space corresponding to a control channel having signal length and thus limiting the number of blinds detection.

[0148] Fig. 7 is a schematic of receiving equipment according to embodiment 3 of the invention. As shown in Fig. 7, the receiving equipment includes a first processing module 71 and / or a second processing module 72. The first processing module 71 includes a first module designating the search space 711 and a first detection module 712. The first search space designating module 711 is configured to designate an appropriate search space for at least two channels with the same signal length for the same aggregation level, according to the control channel signal length corresponding to the component carrier, to allow at least two control channels to same signal length, use the same search space. The first detection module 712 is configured to detect control channels having a signal length included in the same search space in the same search space defined by the first search space module 711.

[0149] The second processing module 72 includes a second search space module 721 and a second detection module 722. The second search space designator 721 is configured so that for the aggregation level itself, according to the length of the control channel signal corresponding to the component carrier, the respective search spaces are designated for at least two channels with the same signal length to allow at least two control channels with different signal length, use of a different search space in at least one transmission unit. The second detection module 722 is configured to be in a different space

- the search, determined by the second module designating the 721 search space, detect control channels having a signal length included in another search space.

[0150] Furthermore, the first search space designating module 711 may further include a first determining unit 7111 or a second determining unit 7112.

[0151] The first determining unit 7111 is configured to designate an appropriate search space for the same aggregation level, according to the control channel signal length corresponding to the component carrier, for at least two channels with the same signal length, to allow at least two channels control with the same signal length, corresponding to different component carriers, using the same search space. The second determining unit 7112 is configured to designate an appropriate search space for at least two control channels of the same aggregation level according to the control channel signal length corresponding to the component carrier for at least two control channels with the same signal length. signal length, corresponding to the same component carrier, using the same search space.

[0152] Furthermore, the second search space designating module 721 includes a third determining unit 7211 or a fourth determining unit 7212.

[0153] The third determining unit 7211 is configured to determine appropriate search spaces for control channels having at least two different signal lengths and corresponding to different carrier components to allow at least two control channels having different signal lengths to use different search spaces in at least one transmission unit. The fourth determining unit 7212 is configured to determine appropriate search spaces for at least two control channels having different signal lengths and corresponding to the same carrier component to allow at least two control channels having different signal lengths to use different search spaces in every at least one transmission unit.

[0154] The first search space module 711 and / or the second search space module 721 further includes a position determination unit 73 and / or a preliminary search space unit 74.

[0155] The position determining unit 73 is configured to determine the start position and size of the search space corresponding to the control channel. The initial search space unit 74 is configured to define a search space corresponding to a control channel that has a signal length according to the preliminary search space corresponding to a control channel having the signal length. Additionally, for information on the method, reference may be made to the description of embodiments 1 and 2 of the invention.

[0156] Furthermore, the position determining unit 73 includes the determination position subunit 731 of the start position.

[0157] The start position determination subunit 731 is configured to determine the start position of the lookup space corresponding to the control channel according to the signal length ID or signal length group ID; or according to a random one or more of: Signal length ID or signal length group ID and UE ID, control channel format ID, space split, component carrier ID corresponding to the control channel, subframe number or aggregation level, determine the start position of the search space corresponding to the control channel.

[0158] The preliminary search space unit 74 includes the first preliminary search space subunit 741 and the second preliminary search space subunit 742 or the third preliminary search space subunit 743, and further includes the fourth preliminary search space subunit 744.

[0159] The first search subunit 741 is configured to designate an initial search space corresponding to each component carrier, and the initial search space corresponding to a control channel having each signal length and corresponding to the same component carrier is a preliminary search space of such component carrier itself.

[0160] The second search sub-unit 742 is configured to designate a preliminary search space corresponding to a control channel having each signal length and corresponding to each component carrier in which if at least two of the same signal lengths occur in signal lengths corresponding to this component carrier itself, control channels having at least two identical signal lengths, can use the same initial search space; and / or if at least two different signal lengths occur in signal lengths corresponding to the same carrier component, control channels having at least two different signal lengths may use different initial lookup spaces in at least one transmission unit.

[0161] The third search subunit 743 is configured to designate the initial search space corresponding to each component carrier group after grouping the component carriers, and the initial search space corresponding to the control channel having each signal length and corresponding to the same component carrier group , is the initial search space with the same carrier group of the component.

[0162] The fourth subunit 744 of the initial search space is configured such that if the length of the control channel signal corresponding to one carrier of the component is different from one length of the control channel signal corresponding to another one or more carriers to cause the search space corresponding to the control channel , having one signal length and corresponding to one component carrier and the other one or more component carriers, was completely or partially the same as the initial search space corresponding to the control channel having one signal length; and / or if one control channel signal length corresponding to one component carrier,

47 is the same as the length of the control channel signal corresponding to another or several other component carriers, the UE search space corresponding to the control channel which has one signal length and corresponding to one component carrier and another or several other component carriers, constitutes the whole or a portion of the UE search space formed from the initial UE search space corresponding to the control channel, which has one signal length and corresponding to one component carrier and the UE's preliminary search space corresponding to a control channel that has one signal length and corresponding to another or several other component carriers.

[0163] Furthermore, after the first search space determination module 711 determines the search space corresponding to the control channel according to the signal length, the first detection module 712 is configured to perform blind detection in the determined same search space on the control channels having signal length in the same search space. After the second search space determination module determines the search space corresponding to the control channel according to the signal length, the second detection module is further configured to perform blind detection in a designated different search space on control channels having a signal length included in another search space.

[0164] In addition, when the search space includes a search space preferably detected, if a control channel having a predetermined signal length is present in a preferably detected search space, the first detection module 712 and / or the second detection module 722 detect whether a control channel having an indefinite length signal, occurs in the search space additionally detected. If the control channel having the determined signal length is not present in the preferably detectable search space, the first detection module 712 and / or the second detection module 722 does not detect whether the control channel having the indefinite signal length is present in the further detectable search space.

[0165] In this embodiment, the receiving equipment may be a UE. In this embodiment, reference may be made to the description of embodiment 1 of the invention for information on how the receiving equipment determines the search space according to the length of the control channel signal for the same level of aggregation and detection of the control channel in the search space.

[0166] For the same level of aggregation, the receiving equipment provided in this embodiment may designate a search space according to the control channel signal length to detect a control channel with the signal length in the search space. In addition, the search spaces corresponding to the component carriers having the same signal length as the corresponding control channels can overlap completely or partially, whereby the number of blind detections implemented by the UE is limited. In addition, the UE preferably detects a search space corresponding to a control channel having a determined signal length to further limit the number of blind detections.

[0167] It should be noted that those skilled in the art should understand that all or part of the processes of the method according to the embodiments of the invention can be carried out by means of a program transmitting instructions to the respective devices. The program can be saved on a data carrier that can be read on a computer. After running the program, the process processes according to embodiments of the invention are performed. The storage medium may be a magnetic disk, optical disk, permanent memory (ROM) or direct access memory (RAM).

[0168] In addition, functional units in embodiments of the invention may be integrated in the processing module or present in separate physical units; alternatively two or more units can be integrated in one module. Integrated modules can be implemented in the form of functional hardware or software modules. After implementation in the form of functional program modules and sale or use as an independent product, the integrated modules can also be stored on a medium that allows reading on a computer. The data carrier may be a ROM, magnetic disk or optical disk.

[0169] Particular embodiments do not limit the scope of the invention. Any modifications, equivalent replacements or improvements introduced by those skilled in the art will be included within the scope of the invention. Therefore, the scope of protection of the invention is defined in the appended claims.

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