TWI426802B - Method of performing random access in a wireless communication system - Google Patents

Description

Method of implementing random access in a wireless communication system

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

In the asynchronous mobile communication system standards ^{(3GPP, 3 rd Generation Partnership Project} ; Third Generation Partnership Project) of the wideband code division multiple access (WCDMA, Wideband Code Division Multiple Access ) system, from a network (UTRAN, UMTS Terrestrial Radio Access Network; an example of a downlink transmission channel for transmitting data to a user equipment, including a broadcast channel (BCH, Broadcast Channel) for transmitting system information, and transmitting user traffic or control messages. One of the downlink shared channels (DL-SCH, Downlink Shared Channel). Traffic or control messages for downlink multicast or broadcast services (MBMS, Multimedia Broadcasting and Multicast Service) can be transmitted via the DL-SCH or a multicast channel (MCH). Meanwhile, an example of transmitting data from a user equipment to an uplink transmission channel of a network includes a random access channel (RACH), which can transmit an initial control message and an uplink shared channel (UL). -SCH, uplink shared channel), which can transmit user traffic or control messages.

The RACH in a WCDMA system will be explained below. The RACH is used to transmit short-length data to an uplink, and some RRC messages, such as an RRC connection request message, a cell update message, and a URA update message, can be transmitted via the RACH. Furthermore, a Common Control Channel (CCCH), a Dedicated Control Channel (DCCH), or a Dedicated Traffic Channel (DTCH), which is one of the logical channels, can be mapped. RACH to one of the transmission channels. Furthermore, the RACH, which is one of the transmission channels, is again mapped to a physical random access channel (PRACH) of one of the physical channels.

If a medium access control (MAC) layer of a user equipment commands a physical layer of the user equipment to perform PRACH transmission, the physical layer of the user equipment selects an access slot and a signature. And transmit the PRACH preface to the winding according to the selected result. The preamble is transmitted during an access slot period of length 1.33 ms, and a signature is selected among the 16 signatures, and the signature is transmitted during a first specific length of time of the access slot.

If the user equipment transmits the preamble, a base station transmits a response signal by using an AICH (Acquisition Indicator Channel) for one of the downlink physical channels. The AICH transmitted in response to the preamble will transmit a signature selected by a preamble of a first specific time period in an access slot, the access slot being the access slot to which the preamble is to be transmitted. At this time, the base station transmits an informed (ACK) or an unknown (NACK) via a signature transmitted from the AICH. If the user equipment receives the ACK, the user equipment transmits a message portion of 10 ms or 20 ms by using an Orthogonal Variable Spreading Factor (OVSF) code corresponding to one of the transmitted signatures. If the user equipment receives a NACK, the MAC of the UE again commands the physical layer of the user equipment to perform PRACH transmission after an appropriate time. Meanwhile, if the user equipment does not receive the AICH corresponding to the transmitted preamble, the user equipment transmits a new preamble at a higher power than the previous preamble after a given access slot.

An example of the user equipment transmitting a message by using the RACH in the WCDMA system will be described below.

For this first example, the user equipment in standby mode transmits an initial control message to a network via the RACH. In summary, the user equipment uses the RACH when it is temporarily synchronized to the network and it wants to obtain radio resources to transmit data to an uplink. For example, if the user device is turned on and accesses a new cell for the first time, the user device is substantially synchronized with the chain and receives system information in a cell that the user device wants to access. After receiving the system information, the user equipment transmits an RRC connection access request message. However, since the user equipment is not synchronized to the network temporarily and the uplink radio resources have not been obtained, the user equipment uses the RACH. In other words, the user equipment requests the network to provide radio resources to transmit a connection request message via the RACH. The base station that has been requested to provide the corresponding radio resource configures the appropriate radio resources to the user equipment such that the user equipment can transmit an RRC Connection Request message. The user equipment can then transmit an RRC Connection Request message to the network via the radio resource.

For the second example, the user equipment in the RRC connected mode uses the RACH in a state in which the user equipment connects to the network by using an RRC. In this example, the user equipment is configured to the radio resource according to the radio resource schedule of the network, and transmits the data to the network via the configured radio resource. However, if the data to be transmitted is no longer maintained in a buffer of the user equipment, the network will no longer configure the uplink radio resources. This is because the configuration of the uplink radio resources is inefficient for user equipment that has no data to transmit.

The buffer status of the user device is reported to the network periodically or whenever a particular event occurs. If the new data occurs in a buffer of a user device that does not have a radio resource, the user equipment uses the RACH since the uplink radio resource is not configured for the user equipment. In other words, the user equipment requests the network to provide radio resources required for data transmission via the RACH.

The RACH is an uplink shared channel and is a channel available to all user equipment that wants to attempt initial access to the network. Therefore, if two or more user devices use the RACH at the same time, a collision will occur. If a collision occurs due to two or more user devices, the network should select one of the user devices to perform a normal procedure, and another user should be executed after resolving a problem caused by the collision. The next program of the device. In this example, after random access by the selected user device, it must define a procedure to avoid delays in the program and resolve problems caused by collisions of other user devices.

Accordingly, the present invention is directed to a method for implementing random access in a wireless communication system that substantially reduces more than one of the problems due to the limitations and disadvantages of the related art.

It is an object of the present invention to provide a method of implementing random access in a wireless communication system in which random access is used to avoid unnecessary delays in the wireless communication system.

Another object of the present invention is to provide a method of implementing random access in a wireless communication system in which radio resources are used efficiently in the wireless communication system.

To achieve these and other advantages and in accordance with the purpose of the present invention, as embodied and broadly described herein, a method of implementing random access in a user device using multiple carriers in a wireless communication system, comprising the steps of: transmitting A preamble for random access to a network, receiving a random access response message from the network in response to the preamble, transmitting a connection setting request message to the network, the connection setting request message requesting establishment and the network The connection of the road, and receiving a first message from the network, the first message includes connection setting information and contention resolution information in a random access procedure. If a user equipment identification item of the user equipment is included in the message, the user equipment knows that it has successfully performed random access, and executes the next procedure according to the connection setting information. If the user equipment identifier of the user equipment is not included in the message, the user equipment knows that it has not reached random access, and transmits a random access preamble to the network again after a predetermined period of time. road.

In another aspect of the present invention, a method for performing random access by a user equipment using multiple carriers in a wireless communication system includes the following steps: transmitting in a state where the user equipment is connected to the network Receiving a random access response message from the network in response to a preamble to a preamble, the random access response message including a temporary user equipment identifier of the user equipment, requesting the Configuring the uplink resource by the network, and receiving at least one of a resource giving message and a contention resolution message from the network by using the temporary user device identifier and a private user device identifier of the user device .

The structure, operation, and other features of the present invention will be immediately understood by the preferred embodiments of the present invention, and examples thereof are illustrated in the accompanying drawings. The specific embodiments described later are merely examples in which the technical features of the present invention are applied to an E-UMTS (Evolved Universal Mobile Telecommunications System).

Figure 1 illustrates the network structure of an E-UMTS. A study by the E-UMTS is managed by a system evolution of WCDMA UMTS, and its basic standards currently consists of 3GPP (3 ^rd Generation Partnership Project, Third Generation Partnership Project). E-UMTS can also be called an LTE (Long Term Evolution) system. 3GPP Technical Specification (3 ^rd Generation Partnership Project, Third Generation Partnership Project; Technical Specification Group Radio Access Network, a group of radio access network specifications) version 7 and version 8 can be considered as made on UMTS and E- Detailed information on UMTS.

Referring to Fig. 1, an E-UTRAN includes a base station (hereinafter referred to as 'eNode B' or 'eNB') in which individual eNBs are connected to each other via an X2 interface. At the same time, each eNBs is connected to a user equipment (UE) via a radio interface, and is connected to an EPC (Evolved Packet Core) via an S1 interface. The EPC includes a mobility management entity/system architecture evolution (MME/SAE) gateway.

A layer of a radio interface agreement between a UE and a network can be classified into a first layer L1, a second layer based on three lower layers of the OSI (Open System Interconnection) standard mode well known in the communication system. Layer L2 and a third layer L3. One of the physical layers belonging to the first layer L1 provides an information transfer service using one of the physical channels. The role played by radio resource control (hereinafter referred to as 'RRC') at one of the third layers is to control the radio resources between the UE and the network. To this end, the RRC layer enables RRC messages to be exchanged between the UE and the network. The RRC layer is decentralizable at the network node, including Node B, an AG, and the like, or at the Node B or AG.

FIG. 2 illustrates an architecture diagram of an E-UTRAN (Evolved Universal Terrestrial Radio Access Network). In Fig. 2, a hatched portion represents a functional entity of a user plane, and a non-hatched portion represents a functional entity of a control plane.

3A and 3B illustrate a radio interface protocol structure between a user equipment (UE) and an E-UTRAN, wherein FIG. 3A is a control plane protocol architecture diagram, and FIG. 3B is a user plane protocol architecture. Figure. Referring to FIG. 3A and FIG. 3B , a radio interface protocol vertically includes a physical layer, a data link layer, and a network layer, and horizontally includes a user plane for data information transmission, and a Control plane for signaling transmission. The protocol layers in Figures 3A and 3B can be classified into L1 (first layer), L2 (second layer), and L3 based on three lower layers of the well-known open system interconnection (OSI) standard mode in communication systems. Three floors).

Providing information transfer services to the physical layer of the first layer to an upper layer using physical channels. A physical layer (PHY) is connected via a transport channel to a medium access control (hereinafter abbreviated as MAC) layer above the physical layer. Data is transmitted between the media access control layer and the physical layer through the transport channels. Furthermore, the data is transferred between different physical layers, more specifically through a physical channel between one physical layer on one transmitting side and another physical layer on one receiving side. The physical channel of the E-UMTS is modulated according to an Orthogonal Frequency Division Multiplexing (OFDM) mode, and time and frequency are used as radio resources.

The second layer of media access control (hereinafter abbreviated as MAC) layer provides a service to one of the MAC layer and above radio link control (hereinafter referred to as RLC) via a logical channel. The second layer of the RLC layer supports reliable data transfer. In order to efficiently transmit IP packets (such as IPv4 or IPv6) in a radio communication cycle with a narrow bandwidth, the PDCP layer of the second layer (L2) implements header compression to reduce the equivalent of containing unnecessary control information. The size of the large IP packet header.

A Radio Resource Control (hereinafter referred to as RRC) layer located on the lowest part of the third layer is only defined in the control plane and is related to the configuration, reconfiguration and radio bearers responsible for controlling the logic, transport and physical channels. (hereinafter referred to as RB) release. In this example, RB represents the service provided by the second layer for data transfer between the UE and the UTRAN.

Because the downlink transport channel carries data from the network to the UE, it provides a broadcast channel (BCH) bearer system information, a paging channel (PCH) carrying call message, and a downlink shared channel (SCH) bearer. Traffic or control messages. Traffic or control messages for the downlink multicast or broadcast service may be transmitted via the downlink SCH or an additional downlink multicast channel (MCH). At the same time, because the uplink transport channel carries UE-to-network data, it provides a random access channel (RACH) to carry an initial control message, and an uplink shared channel (UL-SCH) carries user traffic or control messages.

When the logical channel is located above the transport channel and is mapped to the transport channel, it provides a broadcast channel (BCCH, broadcasting channel), a paging control channel (PCCH), and a shared control channel ( CCCH), a multicast control channel (MCCH), and a multicast traffic channel (MTCH).

In the E-UMTS system, an OFDM is used for the downlink, and a single carrier frequency division multiple access (SC-FDMA) is used for the uplink. The OFDM method using multiple carriers uses a unit of multiple subcarriers including a carrier group to allocate resources, and uses an orthogonal frequency division multiple access (OFDMA) as an access method.

A physical layer using OFDM or OFDMA schemes differentiates the enabled carriers into complex groups and transmits individual groups to different receiving sides. The radio resources allocated to each UE by a configuration defined by a time-frequency region on a two-dimensional sphere comprise consecutive subcarriers. One of the time-frequency regions in which OFDM or OFDMA is used is a rectangular form that is segmented in time and subcarrier coordinates. In other words, a time-frequency region can be at least one symbol on a time axis and a rectangular form segmented by the last carrier on a frequency axis. Such a time-frequency region may be configured to be uplinked to one of a particular UE, or an eNB may transmit the time-frequency region to a particular UE in the chain. In order to define such a time-frequency region on the two-dimensional sphere, the number of OFDM symbols and the number of consecutive subcarriers starting from a point having an offset from a reference point must be given.

The E-UMTS currently under discussion uses a 10ms radio frame containing 20 subframes. That is, the primary frame has a length of 0.5 ms. A resource block contains one frame and 12 subcarriers, each of which is 15 kHz. The primary frame includes complex OFDM symbols, and a portion of the complex OFDM symbols (eg, the first symbol) can be used to transmit L1/L2 control information.

Figure 4 illustrates a diagram of a physical channel-structure in an E-UMTS system. In Fig. 4, the primary frame includes an L1/L2 control information transmission area (the hatch portion) and a data transmission area (the non-hatched portion).

Figure 5 illustrates a flow chart of a procedure in accordance with one embodiment of the present invention. In the specific embodiment of Figure 5, the technical features of the present invention are applied to the initial random access procedure of a user device in standby mode.

Referring to FIG. 5, the user equipment transmits a random access preamble to a base station eNB [S51]. In other words, the user equipment selects a specific signature among the plurality of signatures via an access slot and transmits the selected signature to the base station. At this time, the random access preamble may include uplink information or channel measurement information, so the base station can implement resource configuration for uplink information transmission. In this example, a collision occurs if at least two user devices simultaneously implement a random access preamble uplink transmission by using, for example, the same radio resource of the same signature.

The base station transmits a random access response message to the user equipment in response to the random access preamble [S52]. The random access response message includes a signature transmitted from the user equipment, the grant or rejection information of the random access preamble transmission, and a temporary cellular radio network temporary identification item configured to the user equipment (temporary C-RNTI) ), and control information about the transmission of the RRC connection request message. The control information regarding the transmission of the RRC Connection Request message includes radio resource configuration information, a message size, and radio parameters (modulation and coding information and composite ARQ information) for transmission of the RRC connection request message.

The base station transmits the signaling information for receiving the random access response message to the user equipment via the L1/L2 control channel. The signaling information includes a random access radio network temporary identification item (RA-RNTI), representing the transmission of the random access response message, and transmission parameters regarding the transmission of the random access response message. Since the RA-RNTI was previously forwarded to the base station by the user equipment via system information or the like, the user equipment obtains the transmission information via the L1/L2 control channel by using the RA-RNTI, and by using the obtained transmission The message receives the random access response message.

If the signature information of the signature and signature transmission transmitted from the user equipment is included in the random access response message, the user equipment transmits the RRC connection request message to the base station [S53]. At this time, the user equipment transmits the RRC connection request message to the base station by using the uplink radio resource configuration information, the message size, and the radio parameter, and is included in the random access response message. The RRC connection request message includes a user equipment identification item for identifying one of the user equipments. Examples of the user equipment identification item include a broadband UE identification item, such as an International Mobile Subscriber Identity (IMSI) or a Temporary Mobile Subscriber Identity (TMSI).

If the signature transmitted from the user device and the rejection information transmitted by the signature are included in the random access response message, or if the signature transmitted from the user device is not included in the random access response message The user equipment retransmits the random access preamble after a certain time without transmitting the RRC connection request message.

If the RRC connection request message is received from the user equipment, the RRC layer of the base station transmits the RRC connection setup message or the RRC contention resolution message to the user equipment. Preferably, the RRC layer transmits an RRC message including the RRC connection setup message and the RRC contention resolution message. In another example, after transmitting the RRC connection setup message to the user equipment, the base station may transmit the RRC contention resolution message.

If an RRC message including the RRC connection setup message and the RRC contention resolution message is transmitted, the stretch included in the message can be reduced, whereby the radio resource can be used efficiently. The RRC message includes a user equipment identification item that has successfully implemented one of the random access user devices. Preferably, the user equipment identifier is a user equipment identifier, such as an IMSI and a TMSI, included in the RRC connection request message.

If the plurality of user devices collide with each other during the random access preamble or one of the RRC connection setup messages transmission procedures, only one user device that has successfully performed random access can operate according to the RRC connection setup message. In this example, the success of the user device that has successfully implemented the random access means that the random access preamble transmitted from the user device has been successfully received by the base station, and then the RRC connection request has been successfully implemented.

As described above, the RRC connection setup message included in the RRC message includes the broadband user equipment identifier, such as the IMSI and TMSI of the user equipment that has successfully implemented the random access. The user equipment receives control information required to receive the RRC message via the L1/L2 control channel using its temporary C-RNTI. For example, the user equipment can identify whether a specific channel of the L1/L2 control channel is transmitted to itself according to a result of a Cyclic Redundancy Code (CRC) test by using a specific channel of the temporary C-RNTI. For another example, if the temporary C-RNTI is received via the L1/L2 control channel, the user equipment receives a message represented by the temporary C-RNTI. If the specific channel is transmitted to the user equipment, the user equipment receives an RRC message transmitted to a downlink channel of a data area, for example, by using a downlink shared channel of control information transmitted via the specific channel ( DL-SCH).

If the broadband user equipment identifier transmitted via the RRC connection request message is included in the RRC connection setup message, the user equipment can learn that the random access is successfully implemented, and recognize the RRC connection setup message as Its message. At this time, the user equipment uses the temporary user equipment identifier (temporary C-RNTI) as a private C-RNTI for later communication with a network.

If the broadband user equipment identifier transmitted via the RRC connection request message is not included in the RRC message, the user equipment may know that the random access has failed. Meanwhile, if the RRC message including the broadband user equipment identifier is not received at a certain time, the user equipment knows that the random access has failed. At this time, the user equipment starts a random access procedure again by retransmitting the random access preamble to the base station after a certain time.

The foregoing specific embodiments of the present invention may apply a random access procedure for initial access implemented after a radio link failure or delivery.

Figure 6 illustrates a flow chart of a procedure in accordance with another embodiment of the present invention. In the specific embodiment of Fig. 6, the technical features of the present invention are applied to a random access procedure of a user equipment in an RRC connected mode. For example, if the radio resource of the data to be transmitted to the base station is not configured to the user equipment, the user equipment can transmit the data through the random access procedure via the RACH. The specific embodiments described below can be applied to the situation in which the base station is not uplinked to the user equipment, even if it has downlink information to be transmitted to the user equipment in the RRC connected mode.

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

If the signature information of the signature and signature transmission transmitted from the user equipment is included in the random access response message, the user equipment transmits a MAC scheduling request message to the base station [S63]. At this time, the user equipment transmits the MAC scheduling request message to the base station by using the uplink radio resource configuration information, the message size, and the radio parameter, and is included in the random access response message. Preferably, the MAC scheduling request message includes a broadband user equipment identification item for identifying the user equipment. Examples of the user equipment identification include broadband UE identification items such as International Mobile Subscriber Identity (IMSI) or Temporary Mobile Subscriber Identity (TMSI). The specific embodiment of Fig. 6 differs from Fig. 5 in that the scheduling request and the contention resolution procedure are implemented by the MAC layer.

If the signature transmitted from the user device and the rejection information transmitted by the signature are included in the random access response message, or if the signature transmitted from the user device is not included in the random access response message The user equipment retransmits the random access preamble after a certain time without transmitting the MAC scheduling request message.

If the MAC scheduling request message is received from the user equipment, the MAC layer of the base station transmits a resource giving message and a MAC contention resolution message to the user equipment [S64]. The base station may simultaneously transmit the resource giving message and the MAC contention resolution message, or may transmit the MAC contention resolution message after transmitting the resource to the message.

The resource giving message may be transmitted via the L1/L2 control channel, or may be transmitted via L1 signaling by using a physical channel for resource configuration, such as an absolute grant channel (AGCH, Absolute Grant Channel) or a relative grant channel (RGCH, Relative Grant Channel). Conversely, the MAC contention resolution message can be transmitted in the MAC Control PDU. In addition, the base station can transmit the resource giving message and the MAC contention resolution message by combining the two in a MAC Control PDU. Furthermore, a method of transmitting the resource giving message and the MAC contention resolution message to the user equipment via the L1/L2 control channel can be considered. The MAC Control PDU includes a header and a payload, wherein the header may include information representing the MAC Control PDU, and an indicator that is included in the MAC Control PDU on behalf of the resource giving message or the MAC contention resolution message . The payload may include the content of the resource giving message or the MAC contention resolution message.

If the MAC contention resolution message is transmitted in a MAC Control PDU, the MAC Control PDU includes a private C-RNTI of the user equipment that has successfully implemented the random access. If the private C-RNTI of the user equipment is included in a MAC Control PDU, the problem of wasting radio resources may occur. Therefore, the private C-RNTI of the plurality of user equipments that have successfully implemented the random access in a certain period of time may be included in a MAC contention resolution message.

Since the user equipment in the RRC connected mode knows its private C-RNTI before attempting random access, the base station transmits the resource giving message including the private C-RNTI of the user equipment that has passed the competition. If the resource gives a message to be sent via L1, the user equipment recognizes that the resource is given when receiving the resource giving message (including the private C-RNTI) via the resource configuration channel or the L1/L2 control channel. The message is used as a message. However, when the resource giving message (which does not include the private C-RNTI of the user equipment) is received through the resource configuration channel or the L1/L2 control channel, the user equipment does not recognize that the resource gives the message as its message.

If the resource grant message is transmitted in a MAC Control PDU, the control information included in the L1/L2 control channel includes the private C-RNTI of the user equipment to indicate the transmission of the MAC Control PDU. Therefore, the user equipment receives the resource giving message only when the private C-RNTI is included in the L1/L2 control channel.

The control information transmitted from the base station via the L1/L2 control channel indicates that the transmission of the MAC contention resolution message includes the temporary C-RNTI. Therefore, the user equipment receives the MAC contention resolution message only when the temporary C-RNTI is included in the L1/L2 control channel. The temporary C-RNTI is a user equipment identifier configured from the base station via the random access response message. If the temporary C-RNTI is received via the L1/L2 control channel, the user equipment receives the MAC contention resolution message by using control information transmitted via the L1/L2 control channel. The MAC contention resolution message includes a broadband user equipment identification item that has passed the competition.

In the case where the resource giving message is transmitted to the user equipment via the L1/L2 control channel and the MAC contention resolution message is transmitted to the user equipment via the data area, the operation of the user equipment will be described below.

If the temporary C-RNTI of the user equipment is received via the L1/L2 control channel before receiving the resource giving message from the base station, and receiving the MAC contention resolution message indicated by the temporary C-RNTI, The user equipment identifies whether the MAC contention resolution message includes the private C-RNTI of the user equipment. If the private C-RNTI of the user equipment is included in the MAC contention resolution message, the user equipment recognizes that it has successfully implemented the random access and monitors the resource given by the resource of the L1/L2 control channel. Received, which includes the private C-RNTI of the user equipment. If the resource giving message is not received within a certain period of time set previously, the user device starts the random access procedure again. If the resource is given a message within the certain time period, the user equipment transmits the uplink data to the base station via the resource to the radio resource configured by the message.

If the user equipment receives the resource giving message via the L1/L2 control channel before receiving the MAC contention resolution message, including the private C-RNTI, the user equipment can learn that the random access is successfully implemented. Whether or not the MAC contention resolution message is received, and the uplink resource is transmitted to the base station via the resource to the radio resource configured by the message. If the user equipment receives its temporary C-RNTI via the L1/L2 control channel after receiving the resource giving message, the user equipment ignores the packet data represented by the temporary C-RNTI.

In FIG. 5 and FIG. 6, the contention resolution message and the connection setting message or the resource giving message may include a signature transmitted from the user equipment, and includes the radio used in the preamble regarding the random access. The random access preamble or information of the resource. In another example, the contention resolution message and the connection setting message or the resource giving message may include information about a radio resource used to transmit the connection request message or the scheduling request message. The radio resources include information about frequency and/or time. At this time, if the preamble signature or the information about the radio resources transmitted from the user equipment is included in the contention resolution message and the connection setting message or the resource giving message, the user equipment recognizes the competition. Resolving the message and the connection setting message or the resource giving the message as its message, and operating according to the contention resolution message and the content of the connection setting message or the resource giving the message.

The foregoing specific embodiments are achieved by a predetermined variety of structural elements and combinations of features of the present invention. Each of these structural elements or features must be considered selectively, unless otherwise specified. Each of the structural elements or features can be implemented without being combined with other structural elements or features. Also, some structural elements and/or features may be combined with each other to constitute a particular embodiment of the invention. The sequence of operations described in the specific embodiments of the invention may vary. Some structural elements or features of a particular embodiment may be included in another specific embodiment or substituted for corresponding structural elements or features of another particular embodiment. In addition, it will be appreciated that some of the scope of the patent application with reference to the specific scope of the patent application may be combined with other patent claims, and After the application, the new patent application scope is added by amendment.

Specific embodiments of the present invention are described based on data transmission and reception between the base station and the user equipment. In this example, the base station represents a terminal node of a network that implements direct communication with the user equipment. A specific operation that has been described by the base station can be implemented by a node above one of the base stations, as described in this example. In other words, it will be aware of a variety of jobs for communicating with user equipment in the network, including a plurality of network nodes and the base station, which may be by the base station or a network other than the base station The road node is implemented. The base station can be replaced by terminology, such as a fixed station, a Node B, an eNode B (eNB), and an access point. At the same time, the user equipment can be replaced by terms such as mobile stations and mobile subscriber stations.

Particular embodiments in accordance with the present invention may be implemented by a variety of means, such as hardware, firmware, software, or combinations thereof. If the specific embodiment according to the present invention can be implemented by hardware, the random access method in the wireless communication system according to the embodiment of the present invention can be implemented by one or more application specific integrated circuits (ASICs), Digital signal processor (DSP), digital signal processing device (DSPD), programmable logic devices (PLD), field programmable gate array (FPGA, field program) Mable gate arrays), processors, controllers, microcontrollers, microprocessors, etc. are implemented.

If the embodiment of the present invention is implemented by a firmware or a software, the random access method in the wireless communication system according to the specific embodiment of the present invention may be implemented by a module, a program, or a function. Perform the above functions or assignments. A software code can be stored in a memory unit and then can be driven by a processor. The memory unit can transmit data to and receive data from the processor via a variety of well-known means within or outside the processor.

According to the present invention, unnecessary delays can be avoided in the random access procedure of the wireless communication system, and the radio resources can be used efficiently.

It will be appreciated by those skilled in the art that the present invention may be embodied in other specific forms without departing from the spirit and scope of the invention. Therefore, the above specific embodiments are to be considered as illustrative and not restrictive. The scope of the invention must be determined by the understanding of the scope of the appended claims, and all changes made within the scope of the invention are included in the scope of the invention.

Industrial applicability

The invention can be used in a wireless communication system, such as a mobile communication system or a wireless internet system.

FIG. 1 illustrates an E-UMTS (Evolved-Universal Mobile Telecommunications System) network architecture; FIG. 2 illustrates an E-UTRAN (Evolved Universal Terrestrial Radio Access Network) An architecture diagram of the network; FIG. 3A and FIG. 3B illustrate a radio interface protocol structure between a user equipment (UE) and an E-UTRAN, wherein FIG. 3A is an architectural diagram of a control plane protocol, and 3B is an architectural diagram of a user plane agreement; FIG. 4 illustrates an example of a structure for a physical channel in an E-UMTS system; and FIG. 5 illustrates a flow of a procedure according to an embodiment of the present invention Figure 6 and Figure 6 illustrate a flow chart of a procedure in accordance with another embodiment of the present invention.

Claims (10)

A method for implementing random access in a user equipment in a wireless communication system using multiple carriers, the method comprising the steps of: transmitting a preamble to a network for random access to establish a network with a network a radio resource control (RRC) connection; receiving a random access response message from the network in response to the preamble, the random access response message including uplink resource configuration information and a temporary identifier of the user equipment; After receiving the random access response message, the RRC connection request message is sent to the network through the uplink resource, where the uplink resource is configured according to the uplink resource configuration information, and the RRC connection request message requests to establish a connection with the network. The RRC connection request message includes a first user equipment identifier; receiving control information from the network on a control channel, the control information including a second user equipment identifier; and when the second user equipment When the identifier is equal to the temporary identifier of the user equipment, the control information is used to receive a contention resolution message from the network; and the RRC connection is returned. Receiving a message, receiving an RRC connection message from the network, wherein when the contention resolution message includes the first user equipment identifier sent by the user equipment through the RRC connection request message, the user equipment considers the random The access program is successful, and the temporary identifier of the user device is used to communicate with the network One of the private user equipment identifiers (C-RNTI). The method of claim 1, wherein the first user equipment identifier is a broadband user equipment identifier. The method of claim 2, wherein the broadband user equipment identifier is an International Mobile Subscriber Identity (IMSI) or a Temporary Mobile Subscriber Identity (TMSI). The method of claim 1, further comprising the step of receiving signal information for using a random access radio network temporary identifier (RA-RNTI) previously used by the network configuration. It is necessary to receive the random access response message on the control channel. The method of claim 1, further comprising the step of: when the contention resolution message does not include the first user equipment identifier sent by the user equipment through the RRC connection request message, from the use The device sends a random access preamble to the network. A user device implementing random access in a wireless communication system using multiple carriers, the user device configured to: Transmitting a preamble to a network for random access to establish a radio resource control (RRC) connection with a network; receiving a random access response message from the network in response to the preamble, the random access The response message includes an uplink resource configuration information and a temporary identifier of the user equipment; after receiving the random access response message, transmitting an RRC connection request message to the network through the uplink resource, where the uplink resource is Configuring, by the uplink resource configuration information, the RRC connection request message requesting to establish a connection with the network, where the RRC connection request message includes a first user equipment identifier; receiving control information from the network on a control channel, The control information includes a second user equipment identifier; when the second user equipment identifier is equal to the temporary identifier of the user equipment, the control information is used to receive a contention resolution message from the network; The RRC connection request message should be received, and an RRC connection message is received from the network, wherein the contention resolution message includes the RRC connection request message by the user equipment. When the first user equipment identifier is sent, the user equipment considers that the random access procedure is successful, and uses the temporary identifier of the user equipment as one of the private user equipments that communicate with the network. (C-RNTI). The user equipment as claimed in claim 6, wherein the A user equipment identifier is a broadband user equipment identifier. The user equipment of claim 7, wherein the broadband user equipment identifier is an International Mobile Subscriber Identity (IMSI) or a Temporary Mobile Subscriber Identity (TMSI). The user equipment of claim 6, wherein the user equipment is further configured to: receive signal information for use in a random access radio network temporary identifier previously used by the network configuration (RA-RNTI) It is necessary to receive the random access response message on the control channel. The user equipment of claim 6, wherein the user equipment is further configured to: when the contention resolution message does not include the first user equipment sent by the user equipment through the RRC connection request message At the time of the identifier, a random access preamble is sent from the user device to the network.