KR101233181B1 - Random access method in wireless communication system - Google Patents

Abstract

The present invention relates to a random access method in a wireless communication system and a wireless communication terminal therefor. The random access method in a wireless communication system according to the present invention is a random access method through a random access channel in a terminal of a wireless communication system using multiple carriers, and includes a preamble for random access to a network. ), Receiving a first response message from the network in response to the preamble, transmitting a first request message requesting a specific operation to the network, and transmitting the first request message from the network. Receiving a second response message including a result of the specific operation as a response to the request message and a third response message for resolving a collision with at least one or more other terminals, and wherein the second response message is In the case of a dedicated message for the terminal, according to the content of the second response message It can comprise the step of performing the operation.

E-UMTS, LTE, RACH, Collision, Resource Allocation

Description

Random access method in wireless communication system

1 is a diagram illustrating a network structure of an E-UMTS.

2 is a schematic diagram of an Evolved Universal Terrestrial Radio Access Network (E-UTRAN).

3A and 3B illustrate a structure of a radio interface protocol between a UE and an E-UTRAN. FIG. 3A is a control plane protocol configuration diagram and FIG. 3B is a user plane protocol configuration diagram. .

4 shows an example of a physical channel structure used in an E-UMTS system.

5 is a procedure flow diagram of an embodiment according to the present invention.

6 is a process flow diagram of another embodiment according to the present invention.

The present invention relates to a wireless communication system, and more particularly, to a random access method and a wireless communication terminal therefor in a wireless communication system.

In a wideband code division multiple access (WCDMA) system according to the asynchronous mobile communication system standard (3GPP), a BCH for transmitting system information in a downlink transmission channel for transmitting data from a network (UTRAN: UMTS Terrestrial Radio Access Network) to a terminal (Broadcast Channel) and downlink shared channel (SCH) for transmitting user traffic or control messages, etc. Traffic or control messages of downlink multicast or broadcast service (MBMS) may be transmitted through downlink SCH, or may be separately In addition, the uplink transmission channel for transmitting data from the UE to the network may include a random access channel (RACH) for transmitting an initial control message and other user traffic or control messages. There is an uplink shared channel (SCH) to transmit.

Hereinafter, the RACH (Random Access Channel) in the WCDMA system will be described in detail. RACH is used to transmit shorter length data upwards, and some RRC messages such as RRC Connection Request Message, Cell Update Message, and URA Update Message are also RACH. Is sent through. The logical channels Common Control Channel (CCCH), Dedicated Control Channel (DCCH), and Dedicated Traffic Channel (DTCH) may be mapped to the transport channel RACH, which in turn is mapped to the physical channel Physical Random Access Channel (PRACH).

When the medium access control (MAC) layer of the terminal instructs the terminal physical layer to transmit the PRACH, the terminal physical layer first selects one access slot and one signature to transmit the PRACH preamble upwards. do. The preamble is transmitted during an access slot interval of 1.33 ms length, and selects and transmits one signature among 16 signatures during the first predetermined length of the access slot. When the terminal transmits the preamble, the base station transmits a response signal through the downlink physical channel acquisition indicator channel (AICH). The AICH transmitted in response to the preamble transmits the signature selected by the preamble during the first predetermined length of the access slot corresponding to the access slot to which the preamble is transmitted. At this time, the base station transmits a positive acknowledgment (ACK) or a negative acknowledgment (NACK) to the terminal through the signature transmitted by the AICH. If the terminal receives the ACK, the terminal transmits a message portion of 10 ms or 20 ms length using an Orthogonal Variable Spreading Factor (OVSF) code corresponding to the transmitted signature. If the terminal receives the NACK, the terminal MAC instructs the terminal physical layer to transmit the PRACH again after a suitable time. On the other hand, if the UE does not receive the AICH corresponding to the transmitted preamble, the UE transmits a new preamble with a power higher than the previous preamble after a predetermined access slot.

Hereinafter, cases in which a UE transmits a message using a RACH in a WCDMA system will be described.

The first case is a case in which an UE in idle mode transmits an initial control message to a network through an RACH. In general, when the UE uses the RACH, the UE needs time synchronization with the network and when the UE needs to transmit data in uplink but acquires a radio resource when there is no uplink radio resource to transmit the data. to be. For example, when the terminal first powers on and accesses a new cell, the terminal generally synchronizes the downlink and receives system information in the cell to which the terminal is to be connected. After receiving the system information, the terminal transmits a connection request message for an RRC connection. However, the terminal uses the RACH because the current time synchronization with the network is not matched and uplink radio resources are not secured. That is, by using the RACH, the terminal requests radio resources for transmitting a connection request message to the network. The base station receiving the radio resource request allocates an appropriate radio resource to the terminal to transmit an RRC connection request message. Then, the terminal may transmit an RRC connection request message to the network through the radio resource.

The second case is a case where the UE in the RRC connected mode mode uses the RACH while the UE is in the RRC connection with the network. In this case, the terminal receives radio resources according to radio resource scheduling of the network, and transmits data to the network through the allocated radio resources. However, if there is no more data to transmit in the buffer of the terminal, the network will not allocate any more uplink radio resources to the terminal. This is because it is inefficient to allocate uplink radio resources to a terminal having no data to transmit. Here, the buffer status of the terminal is reported to the network periodically or whenever a specific event occurs. When new data is generated in the buffer of the terminal having no radio resource as in the above situation, since there is no uplink radio resource allocated to the terminal, the terminal uses the RACH. That is, the terminal requests the network for radio resources necessary for data transmission using the RACH.

The RACH is an uplink shared channel that can be used by all terminals attempting to initially access the network. Therefore, collision occurs when two or more terminals simultaneously use the RACH. When a collision occurs by two or more terminals, the network selects one of the terminals and proceeds with the normal procedure, and the remaining terminals have to proceed with the following procedure after solving the problem caused by the collision. In this case, there is a need to define a procedure that can smoothly solve the problem caused by the collision for the unselected terminals without incurring a delay in the procedure for the selected terminal.

The present invention has been made to solve the problems of the prior art as described above, an object of the present invention is to provide a random access method that can prevent unnecessary delay in a wireless communication system and a wireless communication terminal therefor.

As a feature of the present invention, when a network receives an uplink message transmitted by a terminal during an uplink random access process, the network transmits a collision resolution message transmitted to the collided terminals and a terminal dedicated downlink message transmitted to the terminal passing the collision together. do.

In addition, the terminal attempts to receive a conflict resolution message and a terminal-specific downlink message together after transmitting an uplink message, and when the collision resolution message received by receiving the collision resolution message indicates to stop or retry an uplink process. The terminal stops or retries an uplink random access process. When the terminal receives the terminal-specific downlink message and the terminal-specific downlink message received is the message for the terminal, the terminal terminates the uplink random access process and performs normal procedure thereafter to transmit and receive data.

When the uplink message is an RRC message transmitted by the RRC layer of the UE, the RRC layer of the network receiving the uplink RRC message transmits an RRC collision resolution message and an RRC UE downlink message, which is an RRC message, and the UE Receive the RRC messages.

When the uplink message is a MAC message transmitted by the MAC layer of the terminal, the MAC layer of the network that receives the uplink MAC message includes a MAC collision resolution message, which is a MAC message, and a MAC terminal dedicated downlink message, or L1 collision resolution, which is an L1 message. Message and a dedicated downlink message for the L1 terminal, and the terminal receives the MAC message or the L1 message.

Preferably, the MAC collision resolution message and the MAC terminal dedicated downlink message are transmitted in a MAC control packet data unit (MAC).

Preferably, the L1 collision resolution message and the L1 terminal downlink message are transmitted through an L1 / L2 control channel.

Preferably, the L1 / L2 control channel is a resource grant channel for uplink data transmission or corresponds to a downlink control channel for downlink data transmission.

Preferably, when the terminal successfully receives the terminal-only downlink message for itself, the terminal stops receiving the conflict resolution message.

Preferably, when the terminal has not successfully received the terminal-specific downlink message for itself, the terminal receives the conflict resolution message.

Preferably, when the terminal only downlink message is transmitted through an L1 / L2 control channel, the terminal only downlink message includes a terminal only identifier of the terminal passed in a collision.

Preferably, when the terminal-only downlink message is transmitted as a MAC control PDU or RRC message, the control information included in the L1 / L2 control channel to indicate the terminal-only downlink message is transmitted to the terminal of the terminal passed in the collision. Contains a dedicated identifier.

Preferably, when the collision resolution message is transmitted through an L1 / L2 control channel, the collision resolution message includes a temporary terminal identifier allocated through a random access response message.

Preferably, when the conflict resolution message is transmitted as a MAC control PDU or RRC message, the L1 / L2 control channel indicating the conflict resolution message includes a temporary terminal identifier allocated through the random access response message.

Preferably, the conflict resolution message includes a terminal dedicated identifier of the terminal passed in the collision or a terminal dedicated identifier of the terminal that has not passed in the collision.

In one aspect of the present invention, a random access method in a wireless communication system according to the present invention is a random access method through a random access channel (random access channel) in a terminal of a wireless communication system using a multi-carrier, to a network Transmitting a preamble for random access, receiving a first response message from the network in response to the preamble, transmitting a first request message requesting a specific operation to the network; Receiving, from the network, a second response message including a result of the specific operation as a response to the first request message and a third response message for resolving a collision with at least one or more other terminals. And the second response message if the second response message is a dedicated message for the terminal. And performing an operation according to the content of the response message.

In another aspect of the present invention, a wireless communication terminal according to the present invention, in a wireless communication system using a multi-carrier, transmitting a preamble for random access to a network and a response to the preamble from the network Receiving a first response message; transmitting a first request message requesting a specific operation to the network; and a result of the specific operation as a response to the first request message from the network. Receiving a second response message and a third response message for resolving a collision with at least one other terminal, and when the second response message is a dedicated message for the terminal, Characterized in that it is set to perform the process of performing the operation according to the content.

Hereinafter, the structure, operation and other features of the present invention will be readily understood by the embodiments of the present invention described with reference to the accompanying drawings. The embodiments described below are examples in which the technical features of the present invention are applied to an evolved universal mobile telecommunications system (E-UMTS).

1 is a diagram illustrating a network structure of an E-UMTS. The E-UMTS system evolved from the existing WCDMA UMTS system and is currently undergoing basic standardization work in the 3rd Generation Partnership Project (3GPP). E-UMTS is also called Long Term Evolution (LTE) system. For details of technical specifications of UMTS and E-UMTS, refer to Release 7 and Release 8 of the "3rd Generation Partnership Project; Technical Specification Group Radio Access Network", respectively.

Referring to FIG. 1, an E-UMTS is a user equipment (hereinafter abbreviated as UE), a base station (hereinafter referred to as an eNode B or eNB), and an access gateway connected to an external network located at an end of a network (E-UTRAN). Access Gateway (hereinafter abbreviated as AG). The AG may be divided into a part for handling user traffic and a part for processing control traffic. At this time, a new interface between the AG for processing new user traffic and the AG for processing control traffic can be communicated with each other. One or more cells exist in one Node B. An interface for transmitting user traffic or control traffic may be used between the eNode Bs. The CN (Core Network) may be configured as a network node for user registration of the AG and the UE. An interface for distinguishing E-UTRAN and CN may be used. The AG manages the mobility of the terminal in the TA (Tracking Area) unit. The TA consists of a plurality of cells. When the UE moves from one TA to another TA, it informs AG that the TA where the TA is located has changed.

Layers of the radio interface protocol between the terminal and the network are based on the lower three layers of the Open System Interconnection (OSI) reference model, which is widely known in communication systems. L2 (second layer), L3 (third layer) can be divided into, wherein the physical layer belonging to the first layer provides an information transfer service (Information Transfer Service) using a physical channel, The radio resource control (hereinafter referred to as RRC) layer located in the third layer plays a role of controlling radio resources between the terminal and the network. To this end, the RRC layer exchanges RRC messages between the UE and the network. The RRC layer may be distributed to network nodes such as Node B and AG, or may be located independently of Node B or AG.

2 is a schematic diagram of an Evolved Universal Terrestrial Radio Access Network (E-UTRAN). In Figure 2, the hatching shows the functional entities of the user plane and the unhatched portion shows the functional entities of the control plane.

3A and 3B illustrate a structure of a radio interface protocol between a UE and an E-UTRAN. FIG. 3A is a control plane protocol configuration diagram and FIG. 3B is a user plane protocol configuration diagram. . The air interface protocols of FIGS. 3A and 3B are horizontally composed of a physical layer, a data link layer, and a network layer, and vertically a user plane for transmitting data information. It is divided into User Plane and Control Plane for Signaling. The protocol layers of FIGS. 3A and 3B are based on the lower three layers of the Open System Interconnection (OSI) reference model, which are well known in communication systems, based on L1 (first layer), L2 (second layer), It may be classified as L3 (third layer).

The physical layer as the first layer provides an information transfer service to an upper layer using a physical channel. The physical layer is connected to a medium access control layer (upper layer) through a transport channel, and data between the medium access control layer and the physical layer moves through the transport channel. Data is transferred between the different physical layers, that is, between the transmitting side and the receiving side physical layer through the physical channel. In E-UMTS, the physical channel is modulated by an orthogonal frequency division multiplexing (OFDM) scheme, thereby utilizing time and frequency as radio resources.

The medium access control (hereinafter, referred to as MAC) layer of the second layer provides a service to a radio link control layer, which is a higher layer, through a logical channel. The Radio Link Control (hereinafter referred to as RLC) layer of the second layer supports reliable data transmission. The PDCP layer of the second layer performs a header compression function to reduce unnecessary control information in order to efficiently transmit data transmitted using an IP packet such as IPv4 or IPv6 in a relatively low bandwidth wireless section. .

The radio resource control layer (hereinafter referred to as RRC) layer located at the bottom of the third layer is defined only in the control plane, and the configuration and resetting of the radio bearer (abbreviated as RB) are performed. It is responsible for the control of logical channels, transport channels and physical channels in relation to configuration and release. At this time, the RB means a service provided by the second layer for data transmission between the UE and the UTRAN.

Downlink transmission channels for transmitting data from the network to the UE include a broadcast channel (BCH) for transmitting system information, a paging channel (PCH) for transmitting a paging message, and a downlink shared channel (SCH) for transmitting user traffic or control messages. There is. In case of a traffic or control message of a downlink multicast or broadcast service, it may be transmitted through a downlink SCH, or may be transmitted via a separate downlink multicast channel (MCH). Meanwhile, the uplink transmission channel for transmitting data from the terminal to the network includes a random access channel (RAC) for transmitting an initial control message and an uplink shared channel (SCH) for transmitting user traffic or control messages.

It is located above the transport channel, and the logical channel mapped to the transport channel is BCCH (Broadcast Channel), PCCH (Paging Control Channel), CCCH (Common Control Channel), MCCH (Multicast Control Channel), MTCH (Multicast Traffic) Channel).

In the E-UMTS system, the OFDM scheme is used in downlink, and the SC-FDMA (Single Carrier-Frequency Division Multiple Access) scheme is used in uplink. The OFDM system, which is a multi-carrier method, is a system for allocating resources in units of a plurality of subcarriers in which a part of carriers is grouped, and uses Orthogonal Frequency Division Multiple Access (OFDMA) as an access method.

In the physical layer of an OFDM or OFDMA system, active carriers are divided into groups and transmitted to different receivers for each group. The radio resource allocated to each UE is defined by a time-frequency region of two-dimensional space and is a set of consecutive subcarriers. In an OFDM or OFDMA system, one time-frequency domain is divided into rectangles determined by time coordinates and subcarrier coordinates. That is, one time-frequency region may be divided into a rectangle partitioned by symbols on at least one or more time axes and subcarriers on a plurality of frequency axes. Such a time-frequency region may be allocated to an uplink of a specific UE or a base station may transmit the time-frequency region to a specific user in downlink. To define such a time-frequency domain in two-dimensional space, the number of consecutive subcarriers starting at a position separated by the number of OFDM symbols in the time domain and an offset from a reference point in the frequency domain should be given.

In the E-UMTS system currently under discussion, a radio frame of 10 ms is used and one radio frame is composed of 20 subframes. That is, one subframe is 0.5 ms. One resource block is composed of one subframe and 12 subcarriers each having a 15 kHZ band. In addition, one subframe includes a plurality of OFDM symbols, and some of the plurality of OFDM symbols (eg, the first symbol) may be used to transmit L1 / 2 control information.

4 illustrates an example of a physical channel structure used in an E-UMTS system, and one subframe includes an L1 / L2 control information transmission area (hatched part) and a data transmission area (unhatched part). do.

5 is a process flow diagram of one preferred embodiment according to the present invention. 5 illustrates an example in which technical features of the present invention are applied to an initial random access process of a terminal in an idle mode.

Referring to FIG. 5, the UE transmits a random access preamble to the base station eNB [S51]. That is, the terminal selects a specific signature from among a plurality of signatures through one access slot and transmits it to the base station. In this case, uplink message information or channel measurement information may be included in the random access preamble so that the base station can allocate resources for uplink message transmission. At this time, if two or more terminals simultaneously transmit the random access preambles using the same signature and the same radio resource, a collision occurs.

The base station transmits a random access response message in response to the random access preamble [S52]. The random access response message is a signature transmitted by the terminal and information on the acceptance or rejection of the random access preamble transmission, a radio network temporary terminal identifier (Temporary C-RNTI) assigned to the terminal and Contains control information related to the transmission of the RRC connection request message. Control information related to the RRC connection request message transmission includes radio resource allocation information and message size, and radio parameters (modulation and coding information, Hybrid ARQ information, etc.) for transmitting the RRC connection request message.

Signaling information for receiving the random access response message is informed through an L1 / L2 control channel. The signaling information includes a random access radio network temporary identifier (RA-RNTI) indicating transmission of the random access response message and a transmission parameter associated with transmission of the random access response message.

When the random access response message includes a signature transmitted by the terminal and includes information indicating acceptance of the signature transmission, the terminal transmits an RRC connection request message to the base station. [S53]. In this case, the terminal transmits the RRC connection request message using radio resource allocation information, message size, and radio parameter included in the random access response message. Preferably, the RRC connection request message includes a terminal identifier for identifying the terminal. The terminal identifier may include a global terminal identifier such as an International Mobile Subscriber Identity (IMSI) or a Temporary Mobile Subscriber Identity (TMSI).

If the random access response message includes a signature transmitted by the terminal and includes information indicating rejection of the signature transmission, or the signature transmitted by the terminal is not included in the random access response message. In this case, the UE retransmits the random access preamble after a predetermined time without transmitting the RRC connection request message.

When the RRC connection request message is received from the terminal, the RRC layer of the base station transmits an RRC connection setup message and an RRC contention resolution message to the terminal. The base station may simultaneously transmit the RRC connection establishment message and the RRC conflict resolution message, or transmit the RRC conflict resolution message after transmitting the RRC connection establishment message.

When a plurality of UEs collide during the transmission of the RRC connection establishment message, only one terminal passed in the collision operates according to the RRC connection establishment message, and all terminals not passed in the remaining collisions are included in the RRC collision resolution message. It works accordingly. Here, the terminal passed in the collision means that the RRC connection request message transmitted by the terminal has been received by the base station, and the corresponding RRC connection request has been successfully performed. This means that the RRC connection request message transmitted by the terminal has not been successfully received by the base station.

The RRC connection establishment message may include a radio network terminal identifier such as Cell RNTI (Cell RNTI) and the wide area terminal identifier. The terminal recognizes the RRC connection establishment message as a message for itself when the RRC connection establishment message includes a wide area terminal identifier transmitted through the RRC connection request message. If the RRC connection establishment message does not include the wide area terminal identifier transmitted through the RRC connection request message, the terminal does not recognize the RRC connection establishment message as a message for itself.

In this case, the control information included in the L1 / L2 control channel to indicate the transmission of the RRC connection configuration message includes a radio network terminal identifier such as the C-RNTI. Therefore, the terminal receives the RRC connection configuration message only when the L1 / L2 control channel includes the radio network terminal identifier.

The RRC collision resolution message may include a wireless network terminal identifier such as C-RNTI and the wide area terminal identifier. If the RRC collision resolution message includes a wide area terminal identifier transmitted by the RRC connection request message, the terminal recognizes that the UE has passed in the collision. However, when the terminal does not receive the RRC connection setup message including the wide area terminal identifier transmitted by the RRC connection request message for a predetermined time, the terminal retransmits the random access preamble after a certain time.

If the RRC collision resolution message does not include the wide-area terminal identifier transmitted by the RRC connection request message, the terminal recognizes that the terminal has not passed in the collision and random access after a certain time. Retransmit the preamble.

In this case, the control information transmitted through the L1 / L2 control channel to indicate the transmission of the RRC conflict resolution message includes the radio network temporary terminal identifier. Therefore, the terminal can receive the RRC collision resolution message only when the L1 / L2 control channel includes the radio network temporary terminal identifier.

6 is a process flow diagram of another embodiment according to the present invention. 6 illustrates an example in which technical features of the present invention are applied to a random access procedure of a terminal in an RRC connected mode. For example, if there is data to be transmitted to the base station by the terminal but the radio resource for this is not allocated, the data may be transmitted through a random access process through the RACH.

Referring to FIG. 6, a UE transmits a random access preamble to a base station [S61], and receives a random access response message from the base station in response to the random access preamble [S62]. Since the steps S61 and S62 are the same as those described in the steps S51 and S52 of FIG. 5, description thereof will be omitted.

When the random access response message includes the signature transmitted by the terminal and includes information indicating acceptance of the signature transmission, the terminal transmits a MAC Scheduling Request message to the base station. [S63]. In this case, the terminal transmits the MAC scheduling request message using radio resource allocation information, message size, and radio parameter included in the random access response message. Preferably, the MAC scheduling request message includes a terminal identifier for identifying the terminal. The terminal identifier may include a global terminal identifier such as an International Mobile Subscriber Identity (IMSI) or a Temporary Mobile Subscriber Identity (TMSI).

When the random access response message includes a signature transmitted by the terminal and includes information indicating rejection of the signature transmission, or when the signature transmitted by the terminal is not included in the random access response message The terminal retransmits the random access preamble after a predetermined time without transmitting the MAC scheduling request message.

Upon receiving the MAC scheduling request message from the terminal, the MAC layer of the base station transmits a resource grant message and a MAC Contention Resolution message to the terminal [S64]. The base station may simultaneously transmit the resource allocation message and the MAC conflict resolution message, or may transmit the MAC collision resolution message after the resource allocation message is transmitted.

The resource allocation message may be transmitted through L1 signaling or in the form of a MAC control PDU, and includes a radio network terminal identifier such as C-RNTI and uplink radio resource information. In case of L1 signaling, the resource allocation message may be transmitted through an L1 / L2 control channel or through a resource grant channel transmitted downward for allocating an uplink resource. When transmitted in the form of the MAC control PDU, the MAC control PDU is composed of a header (header) and payload (payload), the information indicating that the MAC control PDU and the resource allocation message in the corresponding MAC control PDU An indicator may be included indicating that transmission is included. The payload includes the resource allocation message.

When the resource allocation message is transmitted through L1 signaling, when the terminal receives a resource allocation message including its own radio network terminal identifier through a resource allocation channel or an L1 / L2 control channel, the terminal allocates the resource. Recognize the message as a message for yourself. However, when the terminal does not receive a resource allocation message including its own wireless network terminal identifier through the resource allocation channel or the L1 / L2 control channel, the terminal recognizes the resource allocation message as a message for itself. I never do that.

When the resource allocation message is transmitted in the form of the MAC control PDU, the control information included in the L1 / L2 control channel to indicate transmission of the MAC control PDU includes the radio network terminal identifier. Accordingly, the terminal receives the resource allocation message only when the L1 / L2 control channel includes the radio network terminal identifier.

The MAC collision resolution message may include a wireless network terminal identifier such as a C-RNTI, the wireless network temporary terminal identifier, and the wide area terminal identifier. When the terminal includes the terminal identifier of the terminal in the MAC collision resolution message, the terminal recognizes that it has passed in the collision. However, when the terminal does not receive the MAC connection setup message including the terminal identifier of the terminal for a predetermined time, the random access preamble is retransmitted after a predetermined time.

If the MAC collision resolution message does not include the terminal identifier of the terminal, the terminal recognizes that the terminal has not passed in the collision, and retransmits the random access preamble after a certain time.

At this time, the control information transmitted through the L1 / L2 control channel to indicate the transmission of the MAC conflict resolution message includes the radio network temporary terminal identifier. Accordingly, the terminal can receive the MAC collision resolution message only when the temporary temporary network identifier is included in the L1 / L2 control channel.

5 and 6, the contention resolution message and the connection establishment message or resource allocation message may include information related to a signature included in a random access preamble transmitted by the terminal or a radio resource used for the random access preamble. have. As another example, the conflict resolution message and the connection establishment message or resource allocation message may include information related to a radio resource used to transmit the connection request message or a scheduling request message. Herein, the radio resource includes frequency and / or time. In this case, when the terminal includes information related to the corresponding preamble signature or radio resource transmitted by the collision resolution message, the connection establishment message or the resource allocation message, the terminal resolves the collision resolution message and the connection establishment message or resource allocation message. Recognizes that the message is for itself, and operates according to the content of the conflict resolution message and the connection establishment message or resource allocation message.

It will be apparent to those skilled in the art that the present invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. Accordingly, the above detailed description should not be construed as limiting in all aspects and should be considered as illustrative. The scope of the invention should be determined by reasonable interpretation of the appended claims, and all changes within the equivalent scope of the invention are included in the scope of the invention.

According to the present invention, an unnecessary delay can be prevented in a random access process of a wireless communication system.

Claims (13)

A random access method through a random access channel in a terminal in an idle mode in a wireless communication system using a multi-carrier, Transmitting a preamble for random access to a network; Receiving a random access response message in response to the preamble from the network; Transmitting a Radio Resource Control (RRC) connection request message including a first terminal identifier to the network; And Receiving a contention resolution message for resolving a collision with at least one other terminal from the network; If the conflict resolution message includes the first terminal identifier transmitted through the RRC connection request message, the terminal recognizes that the conflict resolution is successful, random access method. The method of claim 1, When the conflict resolution message does not include the first terminal identifier transmitted through the RRC connection request message, a new random access preamble is transmitted after a predetermined time. The method of claim 1, The random access response message includes radio resource allocation information for transmitting the RRC connection request message, random access method. The method of claim 1, The random access response message includes a temporary terminal identifier. 5. The method of claim 4, Control information for receiving the conflict resolution message is received through a control channel, And the control information comprises a second terminal identifier. 6. The method of claim 5, And the collision resolution message is received only when the second terminal identifier included in the control information is the temporary terminal identifier. 5. The method of claim 4, The temporary terminal identifier is a temporary C-RNTI (Temporary Cell-Radio Network Temporary Identifier). The method of claim 1, And the first terminal identifier is an international mobile subscriber identity (IMSI) or a temporary mobile subscriber identity (TMSI). The method of claim 1, Signaling information for receiving the random access response message is received through a control channel, The signaling information includes a Random Access Radio Network Temporary Identifier (RA-RNTI). The method of claim 1, Receiving an RRC connection establishment message in response to the RRC connection request message from the network. delete delete In a wireless communication system using a multi-carrier, a terminal performing random access through a random access channel in an idle mode, Receiving a random access response message in response to the preamble from the network; Transmitting a Radio Resource Control (RRC) connection request message including a first terminal identifier to the network; And Configured to perform a process of receiving a contention resolution message to resolve a collision with at least one other terminal from the network, If the conflict resolution message includes the first terminal identifier transmitted through the RRC connection request message, the terminal recognizes that the conflict resolution was successful, the terminal for wireless communication.

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