Method in which user equipment performs random access in 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.

<p num="p20">Terminal CA function is set as described above may be transmitted or received with the base station data on a plurality of uplink CC (hereinafter 'UL CC') and a plurality of downlink CC (hereinafter 'DL CC'). In addition, the PRACH resources that can transmit the random access preamble for each of the UL CC can be set.</p><p num="p21">On the other hand, in 3GPP Release 10 for the LTE-A it is considering the random access is carried out only through one of the CC to a point in time for the simplification of the implementation. Also, when following the conventional 3GPP LTE system, the terminal is able to send, random access preamble again only after the backoff period has elapsed when receiving the random access response including a backoff indicator after the random access preamble transmission.</p><p num="p22">The following description discusses yet take full advantage of the specific above-described CA system, a terminal performs random access method that can achieve a simplification of the above-described random access operation and the terminal configuration for this implementation.</p>

<p num="p23">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 of, transmitting a first random access preamble through the first UL CC of a plurality of uplink carrier configuration (hereinafter 'UL CC' quot;) to the base station; A first random access response (hereinafter referred to as 'DL CC') a message first downlink configuration carrier having the first UL CC and the correspondence relation including a backoff indicator in response to a random access preamble of the first receiving through; Applying a back-off period in consideration of a backoff indicator received via the first random access response message for the first UL CC; And the terminal comprising: a second random access preamble through the second UL CC the back-off period of the plurality of UL CC even during the back-off period for the first 1 UL CC that is not being applied to transfer to the base station It proposes a method of performing random access.</p><p num="p24">At this time, the user terminal is preferable, and the plurality of UL CC that can be used for random access to the base station to independently manage the back-off operation for the UL CC in the plural, in performing a random access to the base station information and obtaining information about the plurality of DL CC having the plurality of the UL CC and the corresponding relationship to the may be further included.</p><p num="p25">Also, the method comprising: receiving via a second DL CC having a second wherein the UL CC and the random access response message 2 including the correspondence between the backoff indicator in response to the second random access preamble; Applying a back-off period in consideration of a backoff indicator received through the second random access response message for the second UL CC; And if that is the back-off period for all of the plurality of UL CC it applied, comprising one of the plurality of UL CC the first back-off period through the UL CC is terminated transmitting a third preamble random access to the base station a may be further included.</p><p num="p26">In addition, the user terminal performs each of the transmission and random access response message reception of the random access preamble through the DL CC having a plurality of any one of a UL CC of a UL CC and the one UL CC and the correspondence between the point in time It can be configured to.</p><p num="p27">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, a processor comprising a physical layer module, for performing the signal transmission and signal reception over the plurality of DL CC via a plurality of the UL CC, wherein the processor of claim 1 UL If there is a claim 2 UL CC the back-off period of the plurality of UL CC even during the back-off period that is not being applied to the CC, wherein the terminal is configured with the 2 UL CC to send a random access preamble to the base station the proposed device.</p><p num="p28">Here, the processor the in performing a random access procedure to a base station, and it is preferred to independently manage the back-off operation of the plurality of the UL CC, wherein the processor of the said plurality that can be used for random access to the base station having a plurality of information and the UL CC and the corresponding relationship for the UL CC may store information for a plurality of DL CC.</p><p num="p29">In addition, the processor if it is the back-off period applied to all of a plurality of UL CC, of ​​the plurality of UL CC the first through the UL CC back to be off the end of the term of transmitting a random access preamble to the base station It may be configured to the processor through a DL CC having a plurality of UL CC of any one of the UL CC and the one UL CC and the correspondence between the point in time transmission of the random access preamble and a random access response message It can be configured to perform reception, respectively.</p>

<p num="p30">If it follows according to each embodiment of the present invention as described above, while minimizing the increase in complexity of a random access procedure according to utilizing a plurality of the CC it can be reduced the time required due to the random access procedure.</p>

p311 is a view for explaining the structure of a LTE system.

p322 and 3 is a view for explaining the wireless protocol of each layer.

p334 is a view for explaining the CA technology.

p345 is a view for explaining an operation of a terminal and a base station in a contention based random access procedure.

p356 is a view for explaining a method of performing a random access to a base station terminal in accordance with one embodiment of the invention.

p367 is a view for explaining a method for the UE performs the random access preamble retransmission in accordance with an embodiment of the present invention.

p378 and 9 are diagrams for explaining a structure of a terminal and a base station processor in accordance with one embodiment of the invention.

p38Hereinafter, 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.

p39In 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.

p40Furthermore, 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.

p41Hereinafter, first, in connection with any processes performed in the LTE system, at a specific view for a case that the CA is applied to such a system in a random access procedure it is performed.

p42In the LTE system, the terminal the following cases may perform a random access process.

p43- If the terminal is not connected with the base station (RRC Connection), for an initial connection (initial access)

p44- When the UE in the handover process, the target (target) cell, the first connection

p45- If requested by the command of the base station

p46- 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

p47- In the case of wireless connection failure (radio link failure) or handover fails (handover failure) during the recovery process

p48Hereinafter this will be described based on a typical contention-based random access procedure.

p495 is a view for explaining an operation of a terminal and a base station in a contention based random access procedure.

p50(1) First message transmission

p51First, 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).

p52(2) receiving the second message,

p53The 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.

p54Random 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).

p55(3) Third message transmission

p56When 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.

p57On the other hand, the UE transmits by using the received UL approved, the data (i.e., third message), base station (S503). The third message type of a terminal to be included for presence. 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.

p58Two 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").

p59(4) Fourth message reception

p60After 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.

p61On 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.

p62Hereinafter, a method for according to an embodiment of the present invention, the random access procedure as described above, in the communication system that the CA is applied to the terminal is performed in the base station.

p64The CA terminal function is set as described above, can transmit or receive data through a base station and a plurality of UL CC and DL CC plurality. Further, there is a PRACH resources that can be transmitted to each random access preamble for the UL CC can be set. In this situation, you can consider the following scenario.

p651. The terminal may be by one or more of the UL CC from the UL CC is set to itself to perform the random access procedure to transmit the random access preamble to the base station.

p662. However, in any load connected problems of the UL CC by the base station may command the back-off indication to the UE, to the UE retransmits a random access preamble on a random time later.

p673. After the terminal is among the UL CC set to itself, and PRACH resource is set up, but the current random access load condition may exist normal UL CC, in accordance with the prior art, the terminal waits for a random backoff time indication, no choice but to retransmit the random access preamble to the base station.

p68If, as shown in the above scenario, the terminal according to the CA function receives a back-off indicator for a specific UL CC, even though you can use a plurality of UL CC, from a base station in a random access procedure, to be locked out of the other UL CC case, there is a problem that unnecessary delay the retransmission of a random access preamble for a random time.

p69Thus, in one embodiment of the invention the terminal if there is a back-off period (a random period of time) even when the plurality of the non back-off period of the UL CC is applied to UL CC that can be used for a specific UL CC, the UL CC a through proposes to perform a random access preamble transmission.

p706 is a view for explaining a method of performing a random access to a base station terminal in accordance with one embodiment of the invention.

p71Terminal (UE) and a base station (eNB) in Figure 6 is the communication by each using two DL CC (DL (A) and DL (B)), two UL CC (UL (A) and UL (B)) 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.

p726, the base station to the UE UL (A) and UL (B) can be transferred from the random access preamble through the UL (A) (S601). In this embodiment one described assuming a case of random access of the UE is a contention-based random access, may be similarly applied to non-contention-based random access.

p73Stage one in response to the random access preamble transmitted to the base station BS in S601 is to transmit the random access response message to the terminal (S602). Random access response message is received through the DL (A) having a correspondence with the UL (A) a random access preamble transmitted relationship. In this case, the random access response message may be a random access response message including back-off problems due to the load indicator of the UL (A).

p74Receiving a random access response message terminal including a backoff indicator can calculate a back-off time to delay for the random access preamble retransmission (S603). In this embodiment it is assumed that the UE calculates the back-off time to 100 ms. In particular, back-off time is calculated by the terminal in the present embodiment proposes that for UL (A) rather than for the entire UL CC. That is, (the processor of the terminal), the terminal according to this embodiment proposes to independently manage the back-off period for each UL CC.

p75A terminal according to this embodiment may be in addition to reviewing the UL (A) back-off period is 100ms elapsed even before UL (A) as to whether the use of different UL CC. That is, the UE PRACH resource is valid even during the back-off period for a specific UL CC is set, and, by using the UL CC other back-off has been set may send a random access preamble. In the embodiment of Figure 6 the terminal proposes to send a random access preamble to the base station using the UL (B) available in the back-off period for the UL (A) (S604). Thus the base station has received the UL random access preamble through the (B) it is to transmit the random access response message through the DL (B) to the UE (S605). This has terminal receiving the random access response message is to perform the rest of the operation, such as the third message and the fourth message is received after the transmission (S606). However, if the non-contention-based random access is random access step S606 may be omitted.

p76In one embodiment of the present invention the example of Figure 6 described example suggested that even when the back-off is set for a specific UL CC to perform the random access procedure using the other UL CC. This can be based on what that terminal is managed independently in accordance with the present embodiment the back-off of each UL CC. Specifically, the terminal according to the present embodiment through a DL CC used in the random access response received from the base station including a backoff indicator, can distinguish the back-off is applied to UL CC.

p77For Similarly, the other embodiment of the present invention set the back-off to the entire UL CC that the terminal can use, and the first to suggest that using a UL CC back to be off the end of the term of performing the random access preamble retransmission .

p787 is a view for explaining a method for the UE performs the random access preamble retransmission in accordance with an embodiment of the present invention.

p79In the operation of the Figure 7 to the step S601 to step S604 are the same as in Fig. That is, the UE transmits a random access preamble through the UL (A) and, 100ms of the back-off period for the random access response message including back-off indicator from the base station to the UL (A) receiving through the DL (A) even during the application, the terminal can transmit a random access preamble through the UL (B).

p80Thus UL assumes a case of receiving a random access response message including back-off indicator through DL (B) in response to the random access preamble through a (B) transmitted to the base station from the base station (S705). One from the base station received the random access response message including back-off indicator terminal may compute a back-off period for the UL (B) (S706). In this embodiment, the terminal is assumed to apply to calculate the back-off period of 50 ms for the UL (B).

p81On the other hand, UL (A) and UL (B) If the back-off period is applied to both, the terminal can perform retransmission of the random access preamble until the end is the back-off period. However, the terminal according to the present embodiment is selected by the entire UL CC to UL CC that is the back-off period of the fastest end without having to be limited to the specific UL CC can be used for the random access preamble retransmission. In the embodiment of Figure 7 the terminal is any through UL (A) after the back-off period is terminated on, UL (A) Since the back-off period of the first end than the back-off period for the UL (B) for the UL (A) It shows that to perform retransmission access preamble (S707). Thereafter, the terminal may perform the rest of the random access procedure, such as the second message is received, the third transmission message, the fourth message reception (S708).

p82On the other hand, when the back-off period of the two or more UL CC end at the same time during the terminal according to the embodiment of the release use application is available UL CC back off throughout the terminal is any of a UL CC that is the back-off period is terminated UL by selecting a CC it can be used for the random access preamble retransmission.

p84In 3GPP LTE-A release 10, as described above, it is assumed that the random access procedure through a single point in time CC to perform an implementation for the sake of brevity. At this time, one of the random access procedure is contention-based random in the access procedure a first message transmission, a second message is received, as well as, after the back-off is applied first message, retransmitting the second message is received, the third message transmission, and the fourth If the message received far up, manage back-off for each CC in accordance with the above-described embodiment, and even during the back-off period for a particular method to be used for other CC the CC is not be used.

p85Thus, in one embodiment of the present invention to be carried out but the random access procedure through a CC to a point in time, in which a random access procedure is assumed to include a process of message transfer to the first and second messages. Since the third and fourth sorted by message transmission if the received message general HARQ operation, it is assumed here that is not included in the "one of a random access procedure" concept.

p86Further, in another embodiment of the invention the first message to fourth but it considers the entire process to the message to the random access procedure, the second receiving the random access response message including back-off indicator in the message to a particular back-off period when the need to wait, the random access procedure ends, and proposes to set the daeun random access procedure is initiated.

p87Can be referred to; (Secondary Cell S-Cell); (Primary Cell P-Cell), the CC random access procedure is unfulfilled S Cell random access procedure is P count CC made according to the above embodiment.

p89On 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.

p90The 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.

p91First, 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:

p928 and 9 are diagrams for explaining a structure of a terminal and a base station processor in accordance with one embodiment of the invention.

p93Figure 8 specifically illustrates a second hierarchical uplink of the UE for performing the method as a downlink second layer structure of a base station for performing a method as described above, Fig. 9 described above.

p94CA 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.

p95That 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 8 it may include 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 9 includes a plurality of HARQ entities each corresponding to a plurality of CC, it can include a module for processing the scheduling / priority for the uplink resource .

p96It 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.

p97First, 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.

p98MAC 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.

p99On the other hand, the terminal processor according to the present embodiment by using a different UL CC the back-off period for a specific UL CC that is not being this, even if applicable, the back-off period applied may be configured to transmit a random access preamble to the base station . That is, as in the above-described embodiment, each UL CC by a back-off operation may be operable to be applied independently. A processor according to the present embodiment for this purpose is preferably with information about the DL CC corresponding to a plurality of UL CC and thus, the corresponding UL according to the DL CC has received a random access response including a backoff indicator to determine the CC it can be set to specific back-off operation on the UL CC.

p100On the other hand, the processor of the present embodiment is proposed to be set to the terminal if the available UL CC back-off period to the total enabled, the first through the UL CC back to be off the end of the term of performing the random access preamble retransmission The. In the above embodiment the terminal processor is set so that one random access process is performed at a specific point in time, may represent the random access process the first message and a second transmission is made, where the process received messages. If, and ends the random access procedure when receiving the random access response message including back-off directive, a new random access procedure it is to begin.

p101Detailed 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.

p102Embodiment as described above, they have been described by assuming the 3GPP LTE systems to be focused, this needs to be limited is not a terminal in a variety of mobile communication systems, CA technology can be used in the same manner to carry out the random access operation.