Method for a user terminal to random access a carrier aggregation mobile communication system

The random access method of a terminal in a mobile communication system carrier combination method

p01The following description is for a terminal device for how to perform a random access procedure to the terminal by the base station from the plurality of component carriers (Component Carrier) carrier combination (Carrier Aggregation) scheme mobile communication system performing communications using and them.

p02LTE system standard has been established by the 3GPP (3rd Generation Partnership Project) of the International Organization for Standardization as a mobile communication system evolved from the UMTS system, the schematic system architecture are as follows: FIG.

p031 is a view for explaining the structure of a LTE system.

p04LTE system architecture can be divided largely into E-UTRAN (Evolved UMTS Terrestrial Radio Access Network) and the EPC (Evolved Packet Core). The E-UTRAN consists of a UE (User Equipment, UE) and the eNB (Evolved NodeB, a base station), is called the Uu interface between the UE-eNB, the X2 interface between the eNB-Enb. The EPC consists of an S-GW (Serving Gateway) responsible for the MME (Mobility Management Entity) and a user plane (User-plane) function that is responsible for control-plane (Control-plane) functions, between the eNB-MME S1-MME through the interface, S-eNB GW-called S1-U interface, the two collectively also called S1 interface.

p05Radio link in Uu interface is a radio interface protocol (Radio Interface Protocol) is defined, and, which is horizontal to the physical layer (Physical Layer), the data link layer (Data Link Layer) and a network layer (Network Layer) as made jimyeo, vertical It is divided into a user plane (user plane, U-plane) and a control plane for control signal (signaling) transmission (control plane, C-plane) for transmitting user data. This radio interface protocol is commonly a communication system well-known open systems between interconnections (Open System Interconnection; OSI) in the reference three lower layers L1 (first layer), containing the basis physical layer the PHY to the MAC of the model / RLC / PDCP L2 (second layer) containing layer, and can be divided into L3 (third layer) containing the RRC layer. It may exist as a pair (pair) to the UE and the E-UTRAN, and is responsible for transferring data of the Uu interface.

p07It will be described below the LTE-A system.

p08LTE-A (Long-Term Evolution Advanced) system is the LTE system, ITU-R fit the IMT-Advanced conditions of 4G mobile communication conditions recommended by the (International Telecommunication Union - a wireless communication sector - Radiocommunication sector, the International Telecommunication Union) to develop a system which, in the current 3GPP LTE system standard developed by the LTE-a system is ongoing standards development is in full swing.

p09Exemplary techniques that are newly added to the LTE-A system, extend the bandwidth used and also flexibility (flexible) carrier set to be used (Carrier Aggregation) technique, the coverage (coverage) group fluidity (group mobility) increase the support and may be a repeater technique that enables the arrangement of the user-network.

p102 and 3 is a view for explaining the wireless protocol of each layer.

p11The layer provides an information transfer service (Information Transfer Service) to an upper layer using physical channels (Physical Channel); a first layer, a physical (PHY Physical). PHY layer is the top of a medium access control; and between the (Medium Access Control MAC) layer and the transport channels (Transport Channel) is connected through the, PHY layer and the MAC layer via the transport channel data is moved. At this time, the transport channel is divided into a private (Dedicated) transport channel and a common (Common) transport channel depending on whether the larger share of the channel. Then, the data is transferred through the physical channel using radio resources between different PHY layers between, that is, the transmitting side and the receiving side of the PHY layer.

p12A second layer, there are a number of layers. First MAC (Medium Access Control; MAC) layer serves to map various logical channels (Logical Channel) to various transport channels, and logical channels multiplexed (Multiplexing) for the mapping of the various logical channels to one transport channel It plays a role. The MAC layer and the upper layers the RLC layer and are connected to logical channels (Logical Channel), the logical channel is the control channel (Control Channel) to transmit information of the control plane (Control Plane), depending on the type of which is largely transmitted information and divided into a user plane traffic channel (traffic channel) for transmitting information of (user plane).

p13A second layer of the radio link control (Radio Link Control; RLC) layer is a higher layer from the received data the division (Segmentation) and connection (Concatenation) to the lower layer is a radio section to data for transmission to the appropriate to the data size of the control It serves to. In addition, each radio bearer (Radio Bearer; RB) TM (Transparent Mode, transparent mode) in order to be able to ensure the various QoS, UM (Un-acknowledged Mode, no response mode) is requested, and AM (Acknowledged Mode, and it provides three modes of operation of the response mode). In particular, the AM RLC automatic repeat and request for reliable data transmission; and performing a retransmission function through (Automatic Repeat and Request ARQ) function.

p14Second packet data convergence (Packet Data Convergence Protocol; PDCP) of the hierarchical layer which contains a relatively large and unnecessary control information to efficiently transmit from the radio link a small bandwidth when the IP packet transfer, such as IPv4 or IPv6 IP It performs a header compression that reduces (header compression) features a packet header size. This is to be transmitted to only the necessary information from the header (Header) of the data part, it serves to increase the transmission efficiency of the wireless section. Further, the LTE system, the PDCP layer is composed of security (Security) function also to perform, which is integrity protected to prevent the encrypted (Ciphering) and third party data operation to prevent data wiretapping by a third party (Integrity protection).

p15Third the RRC (Radio Resource Control; RRC) located on the top of the hierarchy layer is defined only in the control plane, a radio bearer (Radio Bearer; RB) set of (Configuration), reset (Re-configuration) and release (Release ) it is associated with and responsible for control of logical channels, transport channels and the physical channels. Wherein RB is a radio protocol layer and a channel required for providing a thing specific service that means a logical path provided by the first and second layers of the radio protocol and, in general, RB is set for data transmission between the terminal and the UTRAN define the characteristics and refers to the process of setting the respective detailed parameters and operation methods. RB is again divided into SRB (Signaling RB) and DRB (Data RB) two kinds, SRB is used as a path for transmitting RRC message in the C-plane, DRB is used as a path for transmitting user data on the U-plane .

p17Hereinafter, a set of carrier LTE-A system; will be described (Carrier Aggregation hereinafter abbreviated as CA).

p184 is a view for explaining the CA technology.

p19LTE-A standard technique as described above has been designed such as IMT-Advanced candidate technology of the ITU (International Telecommunication Union), meets the ITU for IMT-Advanced technical requirements. Accordingly, the LTE-A is being discussed to extend the existing LTE system compared to the bandwidth in order to meet the requirements of the ITU progress. In order to expand the bandwidth in the LTE-A system, the existing LTE configuration the carrier (Carrier) which may have on the system carrier; up as previously defined as the (Component Carrier hereinafter referred to as CC), and shown in Figure 4. These CC 5 upto being discussed for use enclosed. CC is described in CA because it can have a bandwidth up to 20MHz system such as LTE, LTE-A technology standard is a concept that can be extended bandwidth up to 100MHz. As such techniques for use by binding a plurality of CC is called CA.

p20Meanwhile, hereinafter, a description will now be concretely view for a random access procedure performed in the LTE system.

p21In the LTE system, the terminal the following cases may perform a random access process.

p22- If the terminal is not connected with the base station (RRC Connection), for an initial connection (initial access)

p23- When the UE in the handover process, the target (target) cell, the first connection

p24- If requested by the command of the base station

p25- It does not meet the time synchronization of the uplink, in a situation that is not assigned to the designated wireless resources used to request a radio resource, when the data in the uplink occurs

p26- In the case of wireless connection failure (radio link failure) or handover fails (handover failure) during the recovery process

p27Hereinafter this will be described based on a typical contention-based random access procedure.

p285 is a view for explaining an operation of a terminal and a base station in a contention based random access procedure.

p29(1) First message transmission

p30First, the terminal system information or handover command (Handover Command) optionally from a set of random access preamble (randomly) one of the PRACH (Physical RACH) that can select a random access preamble, and transmit the random access preambles indicated through It can be transmitted by selecting the resource (S501).

p31(2) receiving the second message,

p32The UE attempts to receive a random access preamble after transmission, the base station system information or handover command, the random access response reception window in my own random access response indicated through as in the step S501 (S502). In more detail, random access response information may be transmitted in a format of the MAC PDU, the MAC PDU may be transmitted through the PDSCH (Physical Downlink Shared CHannel). In addition, in order to receive the terminal information to be transmitted to the appropriate UE PDSCH it is preferred to monitor the PDCCH (Physical Downlink Control CHannel). In other words, it is preferable that the PDCCH includes the information of the terminal which should receive the PDSCH, frequency and time information of radio resources of the PDSCH, and the transmission format of the PDSCH and so on. Once the UE succeeds in receiving the PDCCH that is sent to it, a random access response transmitted to the PDSCH according to information of the PDCCH may be properly received. And the random access response includes the random access preamble distinguisher (ID; for example, RAPID (Random Access Preamble IDentifier)), indicating the uplink radio resource is a UL approved (UL Grant), a temporary cell identifier (Temporary C-RNTI ) and time synchronization correction value (Timing Advance Command: TAC may be included) are.

p33Random access (or random access), why a preamble distinguished self required in the random access response as described above, one random access response, because it can contain a random access response information for one or more terminals, the UL approval (UL Grant ) Tell the temporary cell identifier is valid and whether the TAC to any terminal position is that it is necessary. In this step, the UE assumes that the choice that the random access preamble identifiers that match the random access preamble of their choice in the step S502. This terminal is authorized uplink (UL Grant), a temporary cell identifier (Temporary C-RNTI) and the time synchronization correction value: and the like can be received (Timing Advance Command TAC).

p34(3) Third message transmission

p35When the terminal receives the random access response valid to them, each handling information included in the random access response. That is, the UE and applies the TAC, and stores the temporary cell identifier. Also it may store data to be transmitted in response to the valid random access response received in the Message 3 buffer.

p36On the other hand, the UE transmits by using the received UL approved, the data (i.e., third message), base station (S503). The third message should include the identifier of the terminal. Ve contention-based random access procedure, any terminal in the base station can be determined that performing the random access procedure, because the need to identify the terminals in order to resolve the conflict later.

p37Two methods have been discussed is a method for including an identifier of the terminal. The first method iteotdamyeon has a valid cell identifier received from the terminal is already assigned to a corresponding cell before the random access procedure, the terminal transmits its cell identifier through an uplink transport signal corresponding to the UL approval. On the other hand, if the random access procedure If not received a valid cell identifier previously assigned to the terminal has its own unique identifier (e.g., S-TMSI or random ID (Random Id)) transmits including. In general, the unique identifier is longer than the cell identifier. If the UE transmits data corresponding to the UL approved, the timer for collision resolution; discloses a (contention resolution timer hereinafter "CR timer").

p38(4) Fourth message reception

p39After the terminal is approved through the UL included in the random access response transmitting data including its identifier, and waits for an instruction of the base station for contention resolution. In other words, the attempt to receive the PDCCH to receive a specific message (S504). Two methods have been discussed also in the methods for receiving the PDCCH. The by front corresponding to the UL approval as noted transmitted third message if transmitted by using its own identifier is a cell identifier, by using its own cell identifier attempts to receive the PDCCH, and wherein said identifier is a unique identifier case, it may attempt to receive the PDCCH using a temporary cell identifier included in the random access response. After that, in the former case, if the contention resolution timer when receiving the PDCCH through its cell identifier before it expires, the UE determines that the random access procedure is performed normally, and ends the random access procedure. If the latter case, receives the PDCCH through the temporary cell identifier before the contention resolution timer expires, the data confirms that PDSCH is transmitted to the PDCCH is indicated. If the own ID is included in the contents of the data, the UE determines that the random access procedure is performed normally, and ends the random access procedure.

p41On the other hand, in the operation of the contention-free random access procedure it is presented gijan random access procedure is completed only by the first message and transmitting the second message transmitted in a contention-based random access, unlike the process shown in Fig. However, the first terminal before the terminal transmits the random access preamble to the base station as a message is allocated a random access preamble from the base station, transmitting a random access preamble received is assigned as the first message to the base station, the base station by receiving the random access response is a random access procedure is to be terminated.

<p num="p42">On the other hand, when the contention based random access attempts to the base station to the terminal in the LTE system, can result in incorrect contention resolution procedure to close confused with UL approval (UL Grant) for the other BSR (Buffer Status Report) transmission. These problems are extremely unusual, but if, when the above-mentioned CA described in the LTE-A system is applied, there is a problem the probability of the wrong end collision resolution procedure to be confused with the uplink acknowledgment information for the other CC is increased.</p><p num="p43">Therefore, the following description is to provide a method for CA performs a random access procedure to the base station without confusing a terminal in a mobile communication system described above is applied and the terminal device therefor.</p>

<p num="p44">Performing a random access procedure to the terminal by the base station in the carrier combination (Carrier Aggregation) scheme mobile communication system performing communications using a plurality of component carriers (Component Carrier) In one aspect of the present invention to solve the problems described above a method for, (hereinafter 'UL CC' d) a plurality of configured uplink carrier to the base station transmitting a random access preamble of claim 1 through the UL CC of; Article as a response to the random access preamble 1 UL approval (UL grant) information first downlink configured carrier (hereinafter 'DL CC' has a random access response corresponding to the message and the first UL CC relationship containing La receiving through the box); The method comprising: transmitting a third message to the base station through the uplink radio resources corresponding to the first UL CC within the first uplink acknowledgment information including the ID information of the terminal; And further comprising receiving a second uplink acknowledgment information from the base station, the terminal of the third message transmission only if the second is the UL approval (UL grant) information received over the first 1 DL CC wherein a conflict resolution procedure according to a successful proposes a method of performing random access of a terminal for processing.</p><p num="p45">That is, the MS collision by the second UL approval (UL grant) if the information has been received through the first 1 DL CC, and the other second DL CC, and the second uplink acknowledgment information to transmit the third message, It proposes not considered to resolve the message.</p><p num="p46">In addition, the terminal physical layer module and a MAC (Medium Access Control) layer module for inclusion can be, and the terminal of the physical layer module from the first 1 DL CC to a PDCCH (Physical Downlink Control Channel) is received in the notification recipient only if, the MAC layer module may determine the success of the collision resolution procedure according to the transmission of the third message.</p><p num="p47">Further, the identifier information of the terminal may be in the cell identifier of the terminal (C-RNTI) C-RNTI MAC control element that represents a (C-RNTI MAC Control Element), wherein the terminal includes a second uplink acknowledgment information the PDCCH is received for the DL CC to claim 1, wherein the PDCCH when the points to the cell identifier of the UE, the first can be a successful treatment the collision resolution procedure according to the third message.</p><p num="p48">Further, the identifier information of the terminal may be in the collision terminal comprises an identifier other than the C-RNTI of the UE resolve MAC control element (UE Contention Resolution Identity MAC Control Element), wherein the terminal of the second uplink acknowledgment information comprises PDCCH is received above in claim 1 DL CC, the PDCCH equals to the temporary cell identifier (temporary C-RNTI) of the UE, if the PDSCH corresponding to the PDCCH including the UE contention resolution MAC control element, the first can be a successful treatment the collision resolution procedure according to the third message.</p><p num="p49">In addition, the user terminal only when a transmission to the base station a third message including the C-RNTI MAC control element, the PDCCH is the first to determine whether the success of the collision resolution procedure according to the third message transfer It may take into account whether or not received a DL CC 1.</p><p num="p50">In addition, the terminal of the third message transmission and the second uplink acknowledgment information received and independently wherein 1 UL CC and the other second UL CC and the first 1 DL CC, and the other second DL CC for through the HARQ operation for it is assumed that they can perform.</p><p num="p51">On the other hand, the random access procedure to a base station in the carrier combination (Carrier Aggregation) scheme mobile communication system performing communications using a plurality of component carriers (Component Carrier) According to another aspect of the present invention to solve the problems described above in the terminal device to perform, through a plurality of HARQ entity (entity), and the plurality of uplink configuration carrier (hereinafter 'UL CC') through a plurality of HARQ entity including the corresponding to the plurality of component carriers each signal transmission and a plurality of downlink carrier configuration (hereinafter 'DL CC') MAC layer module that controls the signal received through each corresponding to a UL CC of the plurality; And is functionally connected to the MAC layer module includes a plurality of through the UL CC signal transmission and a processor comprising a physical layer module for performing a signal received through the plurality of DL CC, and wherein the processor is a plurality of UL of the CC through the first 1 DL CC with claim 1 UL CC and the corresponding relationship using to transmit the third message to the base station only when receiving the uplink acknowledgment information, a conflict resolution procedure according to the third message transfer It proposes a terminal device configured to process a successful.</p><p num="p52">In this case, the processor may be configured not to be considered to claim 1 wherein the DL CC and DL CC 2 different from the first authentication information received via the uplink to the collision solving message by the third message.</p><p num="p53">In addition, only if the PDCCH from the physical layer module to the claim 1 DL CC (Physical Downlink Control Channel) is informed that received, the MAC layer module determines the success or failure of the contention resolution procedure by transmitting the third message It can be configured to.</p><p num="p54">On the other hand, the third message may include the above as the identifier information of the terminal C-RNTI MAC control element indicates a cell identifier (C-RNTI) of the terminal (C-RNTI MAC Control Element), wherein the processor is the the PDCCH including the uplink acknowledgment information is received by the first DL CC 1, if the PDCCH is pointing to the cell identifier of the terminal, the third process can be a successful message transfer according to the conflict resolution procedure.</p><p num="p55">In addition, the third message is the terminal identifier information as the terminal of the C-RNTI than in the identifier includes a terminal collision resolution MAC control element (UE Contention Resolution Identity MAC Control Element) the contained to be, and wherein the processor the PDCCH including the uplink acknowledgment information is received above in claim 1 DL CC, the PDCCH equals to the temporary cell identifier (temporary C-RNTI) of the UE, PDSCH, the MAC control resolve the terminal collision corresponding to the PDCCH when containing the element, and can be configured for contention resolution procedure according to the third message sent to a successful treatment.</p><p num="p56">In addition, the processor only if a transmission to the base station a third message including the C-RNTI MAC control element, the PDCCH is the first to determine whether the success of the collision resolution procedure according to the third message transfer It may take into account whether or not received a DL CC 1.</p><p num="p57">Wherein in the above embodiment the terminal is the third message transmission and the uplink acknowledgment information received and independently wherein 1 UL CC and the other claim 2 UL CC and the HARQ operation using said first 1 DL CC different from the first 2 DL CC it is assumed that the can do.</p>

<p num="p58">When subject to the embodiments of the present invention as described above, the collision resolution procedure to misinterpretation of the UL grant signal can be prevented from being shut down jeolmot.</p>

p591 is a view for explaining the structure of a LTE system.

p602 and 3 is a view for explaining the wireless protocol of each layer.

p614 is a view for explaining the CA technology.

p625 is a view for explaining an operation of a terminal and a base station in a contention based random access procedure.

p636 is a view for explaining an example of a terminal may experience confusion in the conflict resolution procedure in performing a contention-based random access to a base station terminal.

p647 shows an example for generating an invalid collision resolution from the contention-based random access procedure in the LTE-A system.

p658 is a view for explaining a method of performing a random access procedure to the terminal by the base station according to an exemplary embodiment of the present invention.

p669 and 10 are diagrams for explaining the structure of a terminal and a base station processor in accordance with one embodiment of the invention.

p67Hereinafter, with reference to the accompanying drawings a preferred embodiment according to the present invention will be described in detail. Detailed be disclosed in conjunction with the accompanying drawings, description is intended to explain exemplary embodiments of the present invention, rather than to show the only embodiments that can be implemented according to the present invention. The following detailed description includes specific detail in order to provide a thorough understanding of the present invention. However, those skilled in the art knows that the invention can be practiced without these specific details. For example, the following description is one described in detail, assuming a case where the mobile communication system of 3GPP LTE-like systems, it is possible, and is applicable to other random mobile communication systems except for the specific requirements of 3GPP LTE-like systems.

p68In some instances, well-known structures and devices in order to avoid obscuring the concepts of the present invention is to be omitted or may be shown as a block diagram of each structure and form around the core functionality of the device. Also, it will be explained using the same reference numerals for the same components in the present specification.

p69Furthermore, in the following description it is assumed that the terminal user to collectively refer to the end device of a mobile or stationary, such as UE (User Equipment), MS (Mobile Station). In addition, the base station is assumed to collectively refer to any node in the network-side communication terminal and the like that Node B, eNode B, Base Station.

p70And to provide in the following description, as described above how the terminal in the mobile communication system in which the CA is applied to a base station performing the random access procedure without confusion in the conflict resolution process, and the terminal device therefor. More specifically, first look for the contention resolution procedure for this will be also discussed a way to prevent the above confusion.

p71The reason for a conflict in a random access procedure is, by default, because the finite number of the random access preamble. That is, the base station because all the terminals can be given specific random access preamble to the UE, the UE transmits a randomly select one from among the common random access preambles. Accordingly, the case in which two or more terminals are transmitted by selecting the same random access preamble through the same PRACH resource occurs, but it is determined in the base station to the one random access preamble transmitted from one UE. Because of this, the base station transmits a random access response to the mobile station, the random access response is predicted to a single terminal to receive. However, because it can cause a conflict, as described above, and the two or more UEs receive one random access response, whereby each of the operations is performed according to the received random access response according to each terminal. That is, by using one of a UL approval (UL Grant) included in the random access response, and to two or more terminals with each other is a problem that transfer the different data on the same radio resources occurs.

p72Accordingly, transmission of the data may all be unsuccessful, the base station may receive data only from a specific terminal according to the location or transmit power of the terminal. In the latter case, the two or more terminals are both because it is assumed that successful transmission of the own data, the base station should inform the terminals that failed to compete in the fact that information about the failure. In other words, the conflict is referred to inform information about the success or failure of the contention resolution (Contention Resolution).

p73Conflict resolution method There are two methods One way is, contention resolution timer: a method using a (Contention Resolution Timer hereinafter referred to as CR timer) and, other one method is how to transfer the identifier of the successful terminal to terminal. In the former case, which is used when the UE has a cell identifier (C-RNTI) before a random access procedure already own. That is, the terminal that already has a cell identifier, operating the transmitting data, including its own cell identifier to the base station, and the contention resolution timer in accordance with the random access response. Then, when the contention resolution timer, containing the own cell identifier information PDCCH is received before it expires, the UE determines that they are successful in the competition, and is normally finished the random access procedure. Conversely, if the contention resolution timer is notified when not received transmits a PDCCH containing the own cell identifier, it is either determined that the failure of the competition and performs the random access procedure again, failure to the upper layer in fact, before the expiry will.

p74In the latter case of conflict resolution method, that is, how to transfer the identifier of the terminal is successful, and is used when the UE does not have a unique cell identifier before the random access procedure. That is, the terminal if there is no own cell identifier, the higher-level identifier (S-TMSI or random access ID (Random Id) than the cell identifier to the data according to the UL approval (UL Grant) information included in the random access response; if below depending on the terminal conflict resolution identifier MAC control element (UE Contention Resolution Identity MAC control element) may be referred to collectively) by including the transfer and then operate the terminal contention resolution timer. Before the contention resolution timer expires, if the data including the higher-level identifier is transmitted to the own DL-SCH, the UE can determine that the random access procedure is successful. On the other hand, before the contention resolution timer expires, when not receiving the transmission data including the higher-level identifier in their DL-SCH, the UE will determine that it is a random access procedure fails.

p75Based on the concept of conflict resolution as described above, it looks at the terminal may experience confusion in the conflict resolution procedure.

p766 is a view for explaining an example of a terminal may experience confusion in the conflict resolution procedure in performing a contention-based random access to a base station terminal.

p77First, in step 1, the UE can transmit new data to the generation of the BSR (Buffer Status Report referred to as, or less BSR (A)) to the base station. At this time, the terminal is assumed to have the radio resource of the uplink for transmitting the BSR (A).

p78On the other hand, in step 2 it is assumed that the high-priority data is generated back to the UE than the data stored in this buffer. The UE shall also transmits a BSR (B) to the base station to report the fact to the base station. However, at this time it is assumed not having a radio resource of the uplink for transmitting the BSR (B). That is, in order to request the radio resource from the base station, the terminal is assumed to perform a contention based random access procedure.

p79On the other hand, the base station can not determine whether the present terminal is performing a random access procedure until correctly received the message 3 or third message in the random access procedure. In the example of Figure 6 the base station is assumed that in a situation not correctly receiving a third message sent by the terminal, sending a UL approval (UL grant) for the BSR (A) received previously to the terminal. However, the UE determines a contention resolution message of a random access procedure for transmitting the BSR (B) to the UL approved, it can be determined that the random access procedure is successful. Accordingly, BSR (B) is transmitted to the terminal may be lost.

p80In the LTE system, because much the frequency of the problem, but the BSR transmission loss due to incorrect contention resolution shown in the Figure 6, the generation was not a problem. However, because the LTE-A system, the terminal uses the DL CC and a plurality of UL CC, it is possible to increase the frequency of issue of the BSR transmission loss caused by incorrect contention resolution in a contention-based random access procedure.

p817 shows an example for generating an invalid collision resolution from the contention-based random access procedure in the LTE-A system.

p82In Figure 7, the terminal (UE) and a base station (eNB) has two DL CC (DL (A) and DL (B)), respectively, the two UL CC (UL (A) and UL (B)) to the communication using it is assumed that to do. Specifically, it is assumed that the UL UL CC (A) of DL and DL CC (A) a, and the UL UL CC (B) and DL DL CC in (B) is connected to each other. UE can obtain the possible use of CC information and UL / DL CC cross-connection information through system information received from a base station.

p83In, referring to Figure 7, step S701, the UE assumes that the transmission to the base station through the UL CC (A) the BSR (Buffer Status Report, BSR hereinafter referred to as (A)) to the generation of new data. At this time, the terminal is assumed to have the radio resource of the uplink for transmitting the BSR (A). When the base station for the BSR (A) transmitted in step S701 transmits a NACK (S702), the UE can retransmit the BSR (A) (S703).

p84On the other hand, it is assumed that the high-priority data is generated back to the UE than the data stored in this buffer. The UE shall also transmits a BSR (B) to the base station to report the fact to the base station. However, at this time it is assumed not having a radio resource of the uplink for transmitting the BSR terminal (B). That is, in order to request the radio resource to the base station, the terminal is assumed to perform a contention based random access procedure through a UL CC (A). The UE transmits a first message through the UL CC (A) for this purpose, and (S704), the base station a second message as a response thereto can be transmitted to a terminal through a DL CC (A). Thus, by using the uplink acknowledgment information of the received second message, the UE can transmit a third message including a terminal identifier through the UL CC (A) to the base station (S706).

p85On the other hand, the base station can not determine whether the UE is currently performing a third random access procedure until correctly received a message from the random access procedure. The base station in the example of FIG. 7 is assumed that transmission through in a situation not correctly received the third message, the UE transmits, the UL approval for the BSR (A) received previously to the UE DL CC (B) and (S707). In this case, the UE determines a contention resolution message of a random access procedure for transmitting the BSR (B) on the uplink acknowledgment information received in step S707, it can be determined that the random access procedure is successful. Accordingly, BSR (B) is transmitted to the terminal may be lost.

p86In one embodiment of the present invention to prevent the confusion of a terminal in a system, the CA technology is used as described above, only when a terminal is received via the specific DL CC a control signal for the conflict resolution collision of the random access procedure It proposes that the resolution is set to determine a successful. That is, the UE UL approval for the conflict resolution process the uplink grant signal terminal according to claim 3 when not receiving the uplink acknowledgment information through the DL CC corresponding to the transport messages UL CC, the embodiment It proposes not considered to be a signal.

p878 is a view for explaining a method of performing a random access procedure to the terminal by the base station according to an exemplary embodiment of the present invention.

p88In the example of Figure 8 to the terminal two UL CC for the CA function from the base station (the UL (A) and referred to as UL (B)) and two DL CC (hereinafter DL (A) and DL (B) it is assumed that a is set to be used hereinafter). And UL is assumed that (A) may be mapped to the DL (A), UL (B) are mapped to the DL (B). Also it assumes that the UL (A) and UL (B) both to perform a random access procedure PRACH resource is set.

p89UE may transmit a random access preamble to perform contention-based random access procedure with a base station via the UL (A) (S801). In a response, the base station may transmit to the UE through a DL (A) maps the random access response with UL (A) (S802). UE may transmit a third message using the uplink acknowledgment information included in the random access response via the UL (A) (S803). The third message contains the identifier of the terminal, the present embodiment assumes that the terminal identifier is a cell identifier (C-RNTI). In this embodiment, suppose the identifier of the terminal in a xyz.

p90Terminal a collision solving message including a terminal identifier of the xyz from the base station from the base station can be received through the DL (B) (S804). More specifically, the contention resolution message comprises an uplink acknowledgment information, it is assumed that the PDCCH indicates a cell identifier of the UE in xyz. However, the UE only collision them when the PDCCH including the uplink acknowledgment information received through the DL CC (A) corresponding to the UL CC (A) a random access preamble or the third message is transmitted according to the embodiment it is assumed that the resolution is determined by the message. Therefore, the terminal proposes that does not determine an uplink grant signal that is sent to the DL (B) to the collision solving message (S805). Accordingly, the terminal continues to try to receive the collision solving message until the contention resolution timer expires.

p91Then, the terminal has an uplink grant signal including the ID of xyz of the terminal from the base station can be received through the DL (A) (S806). In this case it is assumed that collision of the terminal resolution before the timer expires. Accordingly, since the UL grant signal has been received in any of the access preamble and a transmitting a third message UL (A) and mapped DL (A), the terminal determines it as a collision solving message, whether or not matching of the identifier It can be determined and the like (S808). In this example, the UE includes an uplink acknowledgment information through the DL CC (A) corresponding to the UL CC (A) used for the random access preamble transmission, and a third message transmission, hayeotgi receives the PDCCH indicating the terminal identifier xyz since it can be determined that the random access procedure is successful.

p92The identifier a terminal cell prior to the random access process to the uplink grant signal received, as described with respect to FIG. 8 described above to confirm the DL CC receives it to determine whether it can be used as a collision solving message (C-RNTI if it contains) it may be limited to. When random access does not include the start before the terminal is a cell identifier (C-RNTI) attempts to resolve the conflict using a UE contention resolution identifier control element, receives the PDCCH indicating a temporary cell identifier (Temporary C-RNTI), Thus it should determine whether the PDSCH corresponding to the terminal identifier conflict resolution control element is included in which, because also with respect to the lean-to 7 likely to be confused with the uplink acknowledgment information for the other BSR as mentioned above occur. However, the invention can also be set to account for the DL CC receiving a fourth message for all of the contention-based random access procedure.

p94Specific settings to be considered only uplink acknowledgment information received through the DL CC corresponding to the UL CC by a UE a first message / third message transmission as described with respect to Figure 8 above to the collision solving message is as follows: same.

p95In general, collisions in the random access procedure is performed in the MAC layer of the terminal resolution algorithm is as follows.

TABLE 1

p97If the PDCCH is received notification from the lower layer (that is, the physical layer), the terminal,

p98(1) When a third message to the C-RNTI MAC control element (that is, including a random access procedure initiated before the cell terminal identifier),

p99(A) the random access procedure is contention-based random access procedure, and (that is, the random access procedure has been started in the MAC sub-layer), the received PDCCH indicates a cell identifier (C-RNTI), UL approval for new transmission including information, or

p100(B) If the random access procedure is non-contention based random access procedure, and (that is, the random access procedure is initiated by a PDCCH command), the received cell identifier indicate the PDCCH,

p101(A) it judges that the collision resolution procedure is successful,

p102(B) stops the contention resolution timer.

p103(2) Alternatively, if a third including CCCH SDU to the message, the received PDCCH indicates a temporary cell identifier (Temporary C-RNTI) of the UE, the received MAC PDU has been successfully decoded,

p104(A) and stop the contention resolution timer,

p105(B) match (that is, the terminal identifier of the UE transmits the corresponding MAC PDU is matching the CCCH SDU, including, and the UE contention resolution identifier control element terminal transmits the third message, the UE contention resolution identifier control element if any),

p106(A), and deemed to be successful for the contention resolution procedure,

p107(B) sets the temporary cell identifier (Temporary C-RNTI) used for random access to the cell identifier (C-RNTI).

p109Method of considering a DL CC terminal receives a UL grant signal in accordance with one embodiment of the invention the algorithm, such as Table 1 may be as follows.

p110Table 2

p111From the lower layer (that is, the physical layer) <b><u>Random access preamble transmission or the third message is transmitted through the DL CC corresponding to the use of a UL CC</u></b> If the PDCCH received notification, the terminal,

p112(1) When a third message to the C-RNTI MAC control element (that is, including a random access procedure initiated before the cell terminal identifier),

p113(A) the random access procedure is contention-based random access procedure, and (that is, the random access procedure has been started in the MAC sub-layer), the received PDCCH indicates a cell identifier (C-RNTI), UL approval for new transmission including information, or

p114(B) If the random access procedure is non-contention based random access procedure, and (that is, the random access procedure is initiated by a PDCCH command), the received cell identifier indicate the PDCCH,

p115(A) it judges that the collision resolution procedure is successful,

p116(B) stops the contention resolution timer.

p117(2) Alternatively, if a third including CCCH SDU to the message, the received PDCCH indicates a temporary cell identifier (Temporary C-RNTI) of the UE, the received MAC PDU has been successfully decoded,

p118(A) and stop the contention resolution timer,

p119(B) match (that is, the terminal identifier of the UE transmits the corresponding MAC PDU is matching the CCCH SDU, including, and the UE contention resolution identifier control element terminal transmits the third message, the UE contention resolution identifier control element if any),

p120(A), and deemed to be successful for the contention resolution procedure,

p121(B) sets the temporary cell identifier (Temporary C-RNTI) used for random access to the cell identifier (C-RNTI).

p123On the other hand, has a terminal a cell identifier prior to the start of a random access procedure according to an embodiment of the present invention, the uplink and only if the random access procedure is specifically disclosed by the MAC sublayer (MAC sublayer) of the UE terminal itself, when considering a DL CC has received the authorization signal may be as follows.

TABLE 3

p125If the PDCCH is received notification from the lower layer (that is, the physical layer), the terminal,

p126(1) When a third message to the C-RNTI MAC control element (that is, including a random access procedure initiated before the cell terminal identifier),

p127(A) the random access procedure is a contention-based random access procedure (that is, the random access procedure was initiated by the MAC sub-layer), <b><u>The received PDCCH is received through the DL CC to be random access preamble transmission or the third message is transmitted in correspondence with the UL CC is used,</u></b>The received PDCCH indicates a cell identifier (C-RNTI), or includes an uplink acknowledgment information for a new transmission,

p128(B) If the random access procedure is non-contention based random access procedure, and (that is, the random access procedure is initiated by a PDCCH command), the received cell identifier indicate the PDCCH,

p129(A) it judges that the collision resolution procedure is successful,

p130(B) stops the contention resolution timer.

p131(2) Alternatively, if a third including CCCH SDU to the message, the received PDCCH indicates a temporary cell identifier (Temporary C-RNTI) of the UE, the received MAC PDU has been successfully decoded,

p132(A) and stop the contention resolution timer,

p133(B) match (that is, the terminal identifier of the UE transmits the corresponding MAC PDU is matching the CCCH SDU, including, and the UE contention resolution identifier control element terminal transmits the third message, the UE contention resolution identifier control element if any),

p134(A), and deemed to be successful for the contention resolution procedure,

p135(B) sets the temporary cell identifier (Temporary C-RNTI) used for random access to the cell identifier (C-RNTI).

p137On the other hand, has a terminal a cell identifier prior to the start of a random access procedure according to an embodiment of the present invention, a random access procedure is a base station command, specifically limited to the case disclosed by a PDCCH command receiving an uplink grant signal DL CC when considering may be as follows.

TABLE 4

p139If the PDCCH is received notification from the lower layer (that is, the physical layer), the terminal,

p140(1) When a third message to the C-RNTI MAC control element (that is, including a random access procedure initiated before the cell terminal identifier),

p141(A) the random access procedure is contention-based random access procedure, and (that is, the random access procedure has been started in the MAC sub-layer), the received PDCCH indicates a cell identifier (C-RNTI), UL approval for new transmission including information, or

p142(B) The random access procedure is non-contention based random access procedure, and (that is, the random access procedure is initiated by a PDCCH command), <b><u>The received PDCCH is received through the DL CC to be random access preamble transmission or the third message is transmitted in correspondence with the UL CC is used,</u></b> If the received PDCCH indicating a cell identifier,

p143(A) it judges that the collision resolution procedure is successful,

p144(B) stops the contention resolution timer.

p145(2) Alternatively, if a third including CCCH SDU to the message, the received PDCCH indicates a temporary cell identifier (Temporary C-RNTI) of the UE, the received MAC PDU has been successfully decoded,

p146(A) and stop the contention resolution timer,

p147(B) match (that is, the terminal identifier of the UE transmits the corresponding MAC PDU is matching the CCCH SDU, including, and the UE contention resolution identifier control element terminal transmits the third message, the UE contention resolution identifier control element if any),

p148(A), and deemed to be successful for the contention resolution procedure,

p149(B) sets the temporary cell identifier (Temporary C-RNTI) used for random access to the cell identifier (C-RNTI).

p151On the other hand, when considering another embodiment the UE DL CC an uplink grant signal received only if that does not have a cell identifier prior to the start a random access process in the present invention can be used the following algorithm: .

TABLE 5

p153If the PDCCH is received notification from the lower layer (that is, the physical layer), the terminal,

p154(1) When a third message to the C-RNTI MAC control element (that is, including a random access procedure initiated before the cell terminal identifier),

p155(A) the random access procedure is contention-based random access procedure, and (that is, the random access procedure has been started in the MAC sub-layer), the received PDCCH indicates a cell identifier (C-RNTI), UL approval for new transmission including information, or

p156(B) If the random access procedure is non-contention based random access procedure, and (that is, the random access procedure is initiated by a PDCCH command), the received cell identifier indicate the PDCCH,

p157(A) it judges that the collision resolution procedure is successful,

p158(B) stops the contention resolution timer.

p159(2) Alternatively, if a third including CCCH SDU to the message, the received PDCCH indicates a temporary cell identifier (Temporary C-RNTI) of the UE, the received MAC PDU has been successfully decoded,

p160(A) and stop the contention resolution timer,

p161(B) <b><u>The received PDCCH is received through the DL CC to be random access preamble transmission or the third message is transmitted in correspondence with the UL CC is used,</u></b>The corresponding MAC PDU includes a UE contention resolution identifier control element and, if the UE contention resolution identifier control element matching the CCCH SDU which the UE transmits in the third message (that is, that matches the terminal identifier of the terminal is transmitted) ,

p162(A), and deemed to be successful for the contention resolution procedure,

p163(B) sets the temporary cell identifier (Temporary C-RNTI) used for random access to the cell identifier (C-RNTI).

p165Table 2 to the algorithm shown in Table 5 may be used in combination with each other.

p166On the other hand, the following description for the configuration of the terminal device and a base station for performing a random access to the base station as described above.

p167The terminal and the base station apparatus includes an antenna, processor, etc., depending on the model. However, the following description will examine the processor configured to control focus in performing the above-described operation.

p168First, the processor of the terminal and the base station may have a layer structure as described above with respect to FIGS. However, the processor of the terminal and base station to be used in a system with the CA in accordance with the embodiments of the invention proposes having the following structure:

p1699 and 10 are diagrams for explaining the structure of a terminal and a base station processor in accordance with one embodiment of the invention.

p170A downlink second layer structure of a base station to perform the method of Figure 9 is specifically described above, Figure 10 shows a second layer structure uplink of the terminal to perform the method as described above.

p171CA technique is adversely influenced in the MAC layer of the second layer (Layer 2). For example, in the system using a CA and use the plurality of CC, one HARQ entity due to manage one CC, MAC layer of the UE and a base station processor according to this embodiment is the operations related to the plurality of HARQ entity It should be carried out. Furthermore, each HARQ entity will be able, because independently of the transport block (Transport Block) to the process, the CA may CC via a plurality of transmitting or receiving a number of transport blocks in the same time clothing.

p172That is, MAC layer module of the terminal and the base station according to this embodiment includes a plurality of HARQ entity, a plurality of HARQ entity may be responsible for a plurality of each of the CA process. For a MAC layer module of the base station processor as shown in Figure 9 it may comprise a multiplexing module for multiplexing the plurality of HARQ entities each corresponding to a plurality of CC for each terminal (for example, UE1, UE2), the entire It can include a module for scheduling / priority handling for the terminals. In addition, and also the MAC layer module of the terminal processor as shown in Figure 10 includes a plurality of HARQ entities each corresponding to a plurality of CC, can include a module for processing the scheduling / priority for the uplink resource .

p173It will be described below in view of performing the above-described random access operation to the terminal apparatus having the above-described second hierarchy in more detail.

p174First, the terminal processor includes an RRC (Radio Resource Control) layer module for generating a logic signal for the channel or the RRC connection re-connect to the network. For example, RRC connection request message may be transmitted to the MAC layer are mapped to the CCCH to be described later.

p175MAC layer module may be passed to the physical layer logical channel signals for RRC connection / reconnect (e.g., CCCH), and the mapping to the MAC PDU format, which as a transport channel. Here, the transport channel may be transmitted using any one of a plurality of HARQ entity. The physical layer module may be transferred to a base station mapped to this physical channel (for example, PDSCH). If the signal for the above-mentioned RRC connection re / connection may be transmitted to the base station a third message transmitted in the random access procedure. On the other hand, the first and second messages in the random access procedure may be transmitted according to the determination of the physical layer regardless of the HARQ entity.

p176On the other hand, when the terminal processors according to the present embodiment is not received through the DL CC corresponding to the UL CC using the uplink grant signal is a random access preamble transmission or a third message transmission received in the collision resolution process, the up- It suggests that the link grant signal is set not to be considered as a collision solving message. Specifically, a MAC layer of a processor according to the embodiment of the present invention may be configured to perform conflict resolution algorithms, as shown in Table 2 to Table 5 above. Table 2 to Table 5 of the algorithm may be implemented in software or hardware module to the MAC layer.

p177Detailed description of the preferred embodiments of the invention described as mentioned above is provided to enable those skilled in the art to implement and practice the invention. Above has been described with reference to the preferred embodiment of the invention, the skilled person of ordinary skill in the art various changes and modifications to the invention within the scope not departing from the spirit and scope of the invention defined in the claims of the to in the art it will be appreciated that be. Thus, the present invention is not intended to become limited to the embodiments shown herein, where is to be accorded the scope of the disclosed principles and novel features that are consistent with the broadest sense.

p178In the above description, but description is made of a form in which the present invention is applied to a 3GPP LTE based mobile communication system, the present invention can be used with the same or equivalent principles to various mobile communication systems using a combination of a plurality of component carriers.