KR20050100862A - Method for the setting of target channel type filed of new logical channel for mbms in mobile communication - Google Patents

Abstract

The present invention provides a method for distinguishing a data transmission channel for transmitting data for the MBMS and a control channel for transmitting control information for the MBMS in a mobile communication system supporting a multimedia broadcasting / multi-broadcast service (MBMS). do. At this time, in distinguishing the channels, the overhead of the identifier used is minimized.

Description

Method for the setting of Target Channel Type filed of new logical channel for MBMS in mobile Communication}

The present invention relates to a multimedia broadcast / multicast service (hereinafter, referred to as MBMS) in a mobile communication system, and can distinguish a logical channel according to another MBMS service from logical channels according to other services. Is to provide a way.

Today, due to the development of communication technology, the services provided by the mobile communication system are not only conventional voice services but also packet service communication that transmits a large amount of data such as packet data and circuit data, and multimedia broadcasting / communication capable of transmitting multimedia services. Is developing. Accordingly, in order to support the multimedia broadcasting / communication, a multimedia broadcast / multicast service providing a service from one or more multimedia data sources to a plurality of user equipments (hereinafter referred to as UE) is provided. Service, hereinafter referred to as 'MBMS'.

The MBMS service refers to a service for transmitting the same multimedia data to multiple receivers through a wireless network. In this case, by allowing multiple receivers to share one radio channel, it is possible to save radio transmission resources. The MBMS service supports multimedia transmission forms such as real-time video, audio, still images, and text. The MBMS service is a service that can simultaneously provide audio data and video data according to the multimedia transmission format, and requires a large amount of transmission resources. In the case of the MBMS service, since the same data must be transmitted to a plurality of cells in which users are located, one-to-one (Point to Point: 'PtP') or one-to-many depending on the number of users located in each cell. Multipoint: hereinafter referred to as 'PtM') connection is made. That is, the PtP provides a desired MBMS service for each UE for each UE, and dedicated channels are allocated to provide a service. On the other hand, PtM provides a corresponding service by allocating a common channel for each MBMS service for UEs requesting the same MBMS service.

In the following description of the present invention, one example of the mobile communication network will be described as 3GPP (3rd Generation Project Partnership: hereinafter referred to as "3GPP"), which is a standard of a third generation asynchronous mobile communication network, but another MBMS is used. The present invention can be applied to a mobile communication network.

FIG. 1 schematically shows an example of supporting MBMS in a 3GPP mobile communication network, which is a standard of third generation asynchronous mobile communication, and nodes participating in providing an MBMS service in the 3GPP mobile communication network.

Referring to FIG. 1, a core network (hereinafter referred to as 'CN') (100) is a supply of MBMS service and transmission to a UTRAN (UMTS Radio Access Network: referred to as 'UTRAN' hereinafter, 110), and a user terminal. It performs an authentication role of (User Equipment, 120, 121, 122). The UTRAN 110 serves to connect the CN 100 and the UEs 120, 121, and 122, and performs wired and wireless resource allocation and management for transmission of the MBMS service. The UTRAN is composed of a Radio Network Controller (hereinafter referred to as 'RNC', 111) and a base station (hereinafter referred to as 'node B', 112), the RNC 111 is a plurality of node B (112) Can control them. Here, the plurality of node Bs including the node B 112 are each composed of a plurality of cells. The cell is the most basic communication area in a wireless communication network, and may be distinguished due to the frequency or location of each cell.

UE # 1 120, UE # 2 121, and UE # n 122 are user terminals capable of receiving the MBMS service, and there may be a plurality of UEs in each cell. Here, the basic service unit of the MBMS service is a cell, and the service is provided in the form of PtP or PtM in consideration of the radio environment of the cell and the number of UEs to receive the MBMS service. That is, a counting process of determining the number of UEs for determining the type of the MBMS service should be performed.

Basically, in order to perform the MBMS service, data of the MBMS service should be transmitted, and information about the MBMS service, information on a channel through which the data of the MBMS service is transmitted, information indicating the start of the service of the MBMS, During the data transmission of the MBMS service, a number of control information such as information on the change in transmission format, information on the neighboring cell when the neighboring cells are serving the MBMS, and information on the MBMS service currently being served in the cell should be transmitted. .

Figure 2 shows the detailed structure of the upper layer and the channels between each layer of the UTRAN defined in the current 3GPP to which the present invention is applied.

Referring to FIG. 2, messages of higher layers processed in the UTRAN can be largely classified into control signals and user data.

Control space (Control Plain: hereinafter referred to as 'C-Plain', 201) Signal and User Space (User Plain: hereinafter referred to as 'U-Plain', 202) is represented by the data. The C-Plain 201 signal and the U-Plain 202 data are messages of a Non Access Stratum (hereinafter referred to as 'NAS'), and the NAS messages are not used for a wireless connection between the UE and the UTRAN. By pointing to messages that do not, the UTRAN points to messages that do not need to know its contents. Unlike the NAS, a message used directly for wireless connection between the UTRAN and the UE is called an access stratum (hereinafter referred to as an 'AS') message, and is referred to as a radio resource control (RRC) of FIG. 2. 203) Refers to the control signal used below.

The RRC 203 is referred to as a physical layer (hereinafter referred to as 'L1', 210) related to the connection between the UE and the UTRAN, and a medium access control (hereinafter referred to as 'L2 / MAC') of the layer 2. 208, a radio link control (hereinafter referred to as "L2 / RLC") 206. Packet Data Convergency Protocol (hereinafter referred to as "L2 / PDCP") 204, Broadcast / Multicast control (hereinafter referred to as "L2 / BMC", 205) by controlling, It controls all things related to the connection between the UE and the UTRAN, such as physical call setup, logical call setup, control information transmission, and measurement data transmission and reception between the UE and the UTRAN.

The L2 / PDCP 204 receives data to be transmitted from the NAS layer and transmits the data to the L2 / RLC 206 using an appropriate protocol. The L2 / BMC 205 receives data necessary for broadcasting and multicasting from the NAS layer and transmits the data to the L2 / RLC 206 using an appropriate protocol.

The L2 / RLC 206 receives a control message transmitted from the RRC 203 to the UE, and processes the L2 / RLC 206 into an appropriate form in the RLC # 1 261 and the RLC # m 262 in consideration of the characteristics of the control message. A logical channel 207 is used to transmit to the L2 / MAC 208. In addition, the L2 / PDCP 204 and the L2 / BMC 205 receive data and process the data in an appropriate form in the RLC # I 263 and the RLC # n 264 to form a logical channel 207. To the L2 / MAC 208. How many RLCs are generated in the L2 / RLC 206 is determined according to the type and number of logical channels and the number of radio links used between the UE and the UTRAN.

The logical channel 207 is a dedicated type depending on whether it is largely for a specific UE or a few specific UEs, a common type according to whether it is for a plurality of UEs, a control type according to the nature of a message, or It is divided into traffic type that transmits data.

Table 1 below shows the type and role of the logical channel 207 used in the current 3GPP standard.

Name Role BCCH Abbreviation for broadcast control channel, used for downlink transmission from the UTRAN to the UE, and used for transmission of UTRAN system control information. PCCH An abbreviation of paging control channel, used for downlink transmission from the UTRAN to the UE, and used to transmit control information to the UE when the location of the cell to which the UE belongs is unknown. CCCH Abbreviation for common control channel, used for transmission of control information between a UE and a network. DCCH An abbreviation of dedicated control channel, used for one-to-one (1: 1) control information transmission between a UE and a network, when the UE has a connection channel with a radio resource control layer (RRC). Used. CTCH Abbreviation for common traffic channel, used to transmit data to network and UEs, to transmit data that all UEs need to transmit or to time-division information required by some UEs. Used for transmission. DTCH Abbreviation for dedicated traffic channel, used for one-to-one (1: 1) data transmission between the network and the UE.

Under the control of the RRC 203, the L2 / MAC 208 of FIG. 2 manages radio resources between the UE and the UTRNA, manages the connection between the UE and the UTRAN, and also provides logic from the L2 / RLC 206. The channels are received, mapped to the transport channels 209, and transmitted to the L1 layer 210.

Table 2 below shows the types and roles of transport channels used in the current 3GPP standard and their correspondence with logical channels.

 designation  Role BCH Abbreviation for broadcast channel, which is mapped with BCCH to transmit data of the BCCH. PCH An abbreviation for paging channel, which is matched with a PCCH to transmit data of the PCCH. RACH Abbreviation for random access channel, used for transmission from the UE to the network, and used for transmission of network access and control messages and short length data. DCCH, CCCH, DTCH may be mapped. FACH Abbreviation for forward access channel, used for transmitting control messages and data from a network to specific UEs or specific UEs. BCCH, CTCH, CCCH, DCTH, DCCH may be mapped. DCH An abbreviation of dedicated channel, a channel capable of transmitting data and control signals between the network and the UE. DTCH and DCCh are mapped. DSCH Abbreviation for down-link shared channel, which is a downlink channel from a network used for transmission of high capacity data to a UE. DTCH and DCCH are mapped. HS-DSCH An abbreviation of High Speed Dedicated Shared Channel (DSCH), which is a downlink channel from the network which improves the efficiency of the transmission capability of the DSCH to the UE. DTCH and DCCH are mapped.

In addition to the transport channel described in Table 2, an up-link shared channel (hereinafter referred to as USCH) and a common packet channel (hereinafter referred to as CPCH) in 3GPP. Although there exist transport channels, the description thereof will be omitted.

As shown in FIG. 2, the transport channels transmitted to the L1 210 of FIG. 2 correspond to actual physical channels through appropriate processes and are transmitted to the UE or UTRAN.

The physical channels are a primary common control physical channel for transmitting BCH (hereinafter referred to as 'P-CCPCH'), and a secondary common control physical channel for transmitting PCH and FACH (Secondary Common Control Physical Channel) 'S-CCPCH'), a dedicated physical channel for transmitting DCH (hereinafter referred to as 'DCH'), and a physical down-link shared channel for transmitting DSCH (hereinafter, referred to as 'PDSCH'). High Speed Physical Down-link Shared Channel (hereinafter referred to as HS-PDSCH) for transmitting the HS-DSCH and Physical Random Access Channel for transmitting the RACH Hereinafter referred to as 'PRACH'). A pilot channel, a primary synchronization channel, a secondary synchronization channel, a paging indicator channel, which is a pure physical channel that does not transmit other upper layer data or control signals, Acquisition Indicator Channel (Acquisition Indicator Channel), Physical Common Packet Channel (Physical Common Packet Channel).

In this regard, Tables 3 and 4 below summarize the identifiers that can distinguish the logical channels corresponding to the FACH. That is, Table 3 shows identifiers for identifying logical channels corresponding to the FACH in the 3GPP time division duplex scheme (hereinafter, referred to as 'TDD') in which forward and reverse transmissions can be distinguished by time division. Illustrated.

Table 4 below shows identifiers for identifying logical channels corresponding to FACH in a frequency division transmission scheme (Frequency Division duplex: hereinafter referred to as FDD) of 3GPP capable of distinguishing forward transmission and reverse transmission into frequency division. .

In this case, an identifier for distinguishing the logical channels is called a target channel type field (hereinafter referred to as 'TCTF'). The TCTF is attached to the front of the data of the logical channels transmitted in the RLC layer to distinguish the logical channels.

TCTF appointed 000 BCCH 001 CCCH 010 CTCH 01100 DCCH or DTCH over FACH 01101-01111 Reserved (unused value) 100 SHCCH 101-111 Reserved

TCTF appointed 00 BCCH 01000000 CCCH 01000001-01111111 reserved (unused value) 10000000 CTCH 10000001-10111111 Reserved 11 DCCH or DTCH over FACH

As shown in Tables 3 and 4, each logical channel can be distinguished by a TCTF having a plurality of lengths. In this case, the reserved values in <Table 3> and <Table 4> refer to values that are not currently used. The criterion for determining the unused value is to prevent an error of the UE or RNC from identifying a logical channel having a predetermined TCTF value.

For example, in Table 4, for the CCCH using the value of '01000000', all values of '010000001' to '01111111' are treated as reserved. That is, a logical channel having a length of 8 bits starting with 01 Recognized by CCCH.

In addition, in 3GPP, two logical channels are defined to support MBMS service in addition to the above-described logical channels. That is, the MBMS data channel (MBMS Traffic Channel: hereinafter referred to as 'MTCH') to which the MBMS data is transmitted in accordance with the support of the MBMS service, and the MBMS Control Channel (MBMS Control Channel: hereinafter referred to as 'MSCH'). Two logical channels are newly defined. The two logical channels correspond to the transport channel FACH, and are transmitted to UEs that want to receive MBMS service through S-CCPCH, which is a physical channel.

That is, as the MBMS service is supported, the current 3GPP needs an identifier for distinguishing the logical channels for MBMS corresponding to the FACH from other logical channels according to other services. In addition, when determining an identifier of a logical channel according to the MBMS service, there is a need for reducing unnecessary overhead when the MTCH and MCCH correspond to S-CCPCH independently.

Accordingly, an object of the present invention is to provide a method for distinguishing a logical channel according to a broadcast service from other logical channels in a mobile communication system providing a multimedia broadcasting / multicasting service.

Another object of the present invention is to provide an identifier for distinguishing an MTCH for providing data according to the MBMS service and an MCCH for transmitting control information from other logical channels in a mobile communication system providing a multimedia broadcasting / multicasting service. have.

Another object of the present invention is to propose a method of preventing unnecessary overhead in setting identifiers for logical channels when the MTCH and MCCH correspond to the FACH independently of other logical channels.

An embodiment of the present invention, which is invented to achieve the above object, includes one or more user terminals, a wireless access network providing a broadcast service for each service to the user terminals, and the broadcast service connected to the wireless access network. In a mobile communication system including a core network providing a network, a method for distinguishing a logical channel according to the broadcast service and a logical channel supporting another mobile communication service, the method comprising: a data channel for transmitting data according to the broadcast service and the broadcast; Assigning each identifier to distinguish a control channel transmitting control information according to a service from logical channels according to another service, and assigning the data channel and the control channel assigned with each identifier to a forward access channel And mapping and transmitting the same to the user terminal.

Another embodiment of the present invention, which is invented to achieve the above object, includes one or more user terminals, a wireless access network providing a broadcast service for each user terminal by service, and the broadcast connected to the wireless access network. In a mobile communication system including a core network providing a service, the wireless access network distinguishes between a logical channel according to the broadcast service and a logical channel supporting another mobile communication service, the wireless access network according to the broadcast service Setting logical channels supporting the broadcast service in consideration of resource information, identifying whether the logical channels are allocated to a forward access channel independently from logical channels according to other services, and according to the checking result Frequency of use of logical channels according to the broadcast service Trying to variably set the length of the identifier for the logical said logical channel, the logical channel and the And allocating the forward access channel and transmitting the forward access channel to the user terminal.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. It should be noted that in the following description, only parts necessary for understanding the operation according to the present invention will be described, and descriptions of other parts will be omitted so as not to distract from the gist of the present invention.

Also, for convenience of description of the present invention, a case of supporting a multimedia broadcasting / multicasting service in a 3GPP mobile communication system is taken as an example. In this case, the method proposed in the present invention may also be used in other mobile communication systems.

The present invention proposes a method of distinguishing the logical channels according to the MBMS from the existing logical channels according to other mobile communication services. That is, in the mobile communication system supporting the MBMS service, an identifier for distinguishing the MBMS data channel (MTCH) through which the MBMS data is transmitted and the MBMS control channel (MCCH) through which control information necessary for receiving the MBMS service is transmitted from other logical channels is allocated. Suggest how to. In addition, in distinguishing the MTCH and the MCCH, a method of distinguishing using a minimum overhead is proposed.

In this regard, in Tables 5 and 6, new identifier (TCTF) values are used to transmit newly defined MCCH, MTCH and secondary MCCH (Secondary MCCH) to FACH to support MBMS service according to the present invention. Shows an example of defining.

That is, Table 5 below shows an identifier (TCTF) for distinguishing logical channels corresponding to the FACH according to the MBMS service in a TDD mobile communication system according to the present invention.

TCTF appointed 000 BCCH 001 CCCH 010 CTCH 01100 DCCH or DTCH over FACH 01101 Secondary MCCH 01110-01111 Reserved (unused value) 100 SHCCH 1010 MCCH 1011 MTCH 110-111 Reserved (unused value)

On the other hand, Table 6 below shows an identifier (TCTF) for distinguishing logical channels corresponding to the FACH according to the MBMS service in the FDD mobile communication system according to the present invention.

TCTF appointed 00 BCCH 01000000 CCCH 01000001 Secondary MCCH 01000010- 01011111 Reserved 0110 MCCH 0111 MTCH 10000000 CTCH 1000001-10111111 Reserved 11 DCCH or DTCH over FACH

In Tables 5 and 6, the difference between the MCCH and the secondary MCCH is as follows.

The MCCH transmits information on all MBMS services in a cell, information on MTCH, information on neighboring cells, and the like. On the other hand, the secondary MCCH plays a role of transmitting limited MBMS control information corresponding to the same FACH as the MTCH.

Here, the value and length of the TCTF to be used for the MCCH, MTCH and secondary MCCH are determined in consideration of the frequency with which the logical channels are used. That is, in Tables 5 and 6, assuming that the frequency of use of the MCCH and MTCH is the most frequent according to the support of the MBMS service, the 4-bit length of the TCTF of the MCCH and the MTCH is proposed. Therefore, when the logical channels are transmitted corresponding to the transport channel, the overhead that may occur due to TCTF is reduced as much as possible, and the secondary MCCH is 5 bits or 8 assuming that the transmission frequency is less than that of the MCCH and MTCH. It can be determined by the length of the bit.

In this case, the TCTF values of the logical channels for the MBMS service may be reset to have an appropriate length in consideration of the occurrence frequency of the MCCH, MTCH and secondary MCCH.

Table 7 below shows an example of a TCTF value assuming that the MCCH, MTCH, or secondary MCCH corresponds to the FACH independently of other logical channels. This is because logical channels according to the MBMS service may correspond to the same FACH as other logical channels according to other services in the mobile communication service supporting the MBMS.

TCTF appointed 0 MTCH 1000 MCCH 1001 Secondary MCCH 101-111 Reserved

Accordingly, the logical channels for MBMS may independently correspond to the FACH so that the MBMS is a high speed service or does not affect the transmission flow of other logical channels. In this independent correspondence, if the length of the TCTF is long to take into account other logical channels as defined in Tables 5 and 6, unnecessary overhead is required when transmitting the MTCH, MCCH, and secondary MCCH. Can be generated. Therefore, in Table 7, the MTCH is allocated to a TCTF having a length of 1 bit, assuming that the MTCH is most frequently generated, and a 4-bit TCTF is proposed to distinguish the MCCH from the secondary MCCH.

As described above, the TCTF values of the MTCH, MCCH, and secondary MCCH shown in the examples of Tables 5, 6, and 7 may be previously defined and used. Or it may be transmitted to the UE supporting the MBMS through the BCH for transmitting system information. Alternatively, it may be transmitted through the MCCH for transmitting control information according to the MBMS service. In this case, the TCTF value that can be known through the control information transmitted through the MCCH is limited to the MTCH and the secondary MCCH.

3 is a diagram illustrating an L2 / MAC structure diagram of a UTRAN for MBMS according to an embodiment of the present invention. In the present invention, since the L2 / MAC is distinguished from the actual logical channels and the TCTF is set, the present invention will be described by applying L2 / MAC.

Referring to FIG. 3, MAC-c / sh / m is a MAC that handles common transport channels, shared channels, and MBMS related transport channels among MACs. In the case of MAC used in 3GPP, MAC-ds dealing with DCH, MAC-hs dealing with HS-DSCH, and MAC-c / sh dealing with common transport channels such as FACH and RACH. Therefore, the present invention proposes a new concept MAC, MAC-c / sh / m, because the data transmission and control information transmission of the MBMS service is performed through the FACH. In addition, although FIG. 3 illustrates only logical channels according to the MBMS service for convenience of description of the present invention, other logical channels may also be input as MAC-c / sh / m.

First, the MCCH 311 and the secondary MCCH 312 of FIG. 3 are input to a TCTF multiplex block (TCTF mux, 303). A plurality of MCCHs 311 and secondary MCCHs 312 may exist. On the other hand, the MTCH # 1 313 and the MTCH # n 314 are input to the MBMS ID insertion block 301. MCCH # n 314 represents a data channel according to the MBMS service, and the value of n varies.

The MBMS service identifier insertion block 301 inserts an MBMS service identifier into each MTCH to distinguish logical channels transmitting the different MBMS services when the MTCHs transmitting different MBMS services are transmitted to the FACH. .

The TCTF multiplexing block 303 sets the TCTF of the logical channels for MBMS according to the method proposed in the present invention under the control of the controller 302. The controller 302 may be a command for MAC-c / sh / m transmitted from the RRC as a logical unit, or a TCTF setting command determined at the initial setting of MAC-c / sh / m. In addition, the controller 302 may change the TCTF values of the logical channels for the MBMS according to the configuration of the FACH to which the logical channels according to the MBMS service correspond.

The TCTF multiplexing block 303 schedules and prioritizes multiplexing logical channels for MBMS, that is, TCTF values, that is, MCCH 311, secondary MCCH 312, MTCH # 1 313, and MTCH # n 314. Transfer to the processing block (Scheduling / Priority handing, 304). The scheduling and priority processing block 304 determines the transmission of the logical channels according to the priority and transmission scheduling of each logical channel. The transmission format combination selection block (hereinafter referred to as TFC) selection 305 takes into account the available transmission power of the base station, the number of FACHs to be transmitted, the priority of the logical channels corresponding to each FACH, and the like. To determine the appropriate transmission format. At this time, an appropriate amount of data is obtained from logical channels to be transmitted on each FACH using the determined transmission format.

The transmission type combination determined in the transmission type combination selection block 305 is transmitted to the UE in a physical layer signal transmitted such as an S-CCPCH in which FACH is transmitted. Accordingly, the UE uses the physical layer signal to determine which FACHs are correspondingly transmitted to the S-CCPCH. That is, each logical channel processed in an appropriate amount in the transmission type combination selection block 305 is transmitted to the S-CCPCH in correspondence with the FACH1 321 or the FACH # m 322.

4 is a flowchart illustrating the operation of the UTRAN in an embodiment of the present invention. In particular, FIG. 4 illustrates a Radio Resource Control (hereinafter, referred to as 'RRC') unit and an operation flow of RLC and MAC-c / sh / m.

Referring to FIG. 4, in step 401, the UTRAN considers the number of logical channels, data amount, data rate, attribute, and radio resource status in a cell for MBMS. In step 402, the UTRAN determines whether to transmit the logical channels for MBMS in an independent FACH or in correspondence with one FACH like other logical channels.

In this case, if the logical channels for MBMS are to be transmitted corresponding to one FACH like the logical channels, the process proceeds to step 404. In step 404, the UTRAN sets TCTF values of the logical channels for MBMS as shown in Tables 5 and 6, according to an embodiment of the present invention. That is, in step 404, the UTRAN sets the length of the TCTF of the MCCH and the MTCH to 4 bits in consideration of the frequency of use of the MCCH and the MTCH, and sets the secondary MCCH to the length of 5 bits or 8 bits and the other logical channels. Multiplex logical channels for MBMS and correspond to one FACH. In this case, a time division or space division method may be used for the FACH.

On the other hand, if the logical channels for MBMS are independently transmitted corresponding to one FACH, the UTRAN proceeds to step 405. In step 405, the UTRAN sets TCTF values of the logical channels for MBMS according to the embodiment of the present invention as shown in Table 7. The UTRAN maps the logical channels for MBMS to one FACH at 406. In this case, the corresponding method may be time division or space division method.

In step 407, the UTRAN executes work to be performed in the L2 / MAC and the physical layer. The operation that takes place at 407 has already been described above at 3. In step 408, the UTRAN performs an operation of a physical layer required for other radio transmissions, and then transmits FACHs to which UEs correspond to the logical channels for MBMS.

5 is a flowchart illustrating an internal operation of a UE according to an embodiment of the present invention.

Referring to FIG. 5, in step 501, the UE acquires information on TCTF configuration of logical channels for MBMS to be received. The information may be defined and used in advance, the UE may recognize using the predefined value according to the configuration of the FACH for transmitting the logical channels for MBMS, and also received by the UE through the BCH In addition, the TCTF of the secondary MCCH and the MTCH may be received through the MCCH.

In step 502, the UE receives the S-CCPCH and proceeds to step 503 to identify the FACH in which the logical channels for MBMS are transmitted among the FACHs corresponding to the received S-CCPCH. In step 503, the process proceeds to step 504 or 506 according to the configuration of the FACH to demultiplex the logical channels for MBMS. That is, the FACH operation transmitted in step 503 is executed. Herein, the configuration of the FACH indicates whether the FACH is an FACH that transmits only logical channels for MBMS or an FACH that also transmits other logical channels.

In this case, if the FACH is a FACH that also transmits other logical channels, the UE extracts logical channels from the FACH in step 504 to distinguish logical channels for MBMS in step 505. The method proposed in the present invention can be used to distinguish the logical channel for MBMS. On the other hand, if the FACH is a FACH that transmits logical channels for MBMS, then in step 506 the UE extracts logical channels from the FACH.

In step 508, the UE transmits control information transmitted on MCCH or secondary MCCH and MBMS data transmitted on MTCH to RLC or RRC, and the transmitted control information and data are used for each purpose. .

As described above, the present invention provides a method of distinguishing logical channels for MBMS from other logical channels with minimal overhead, in a method of distinguishing the logical channels for MBMS from other logical channels. In addition, when the logical channels for MBMS are to use the dedicated FACH provides a method for setting a TCTF value that can identify the logical channels for MBMS with a minimum of overhead. At this time, the determination and length of the value of the TCTF is determined in consideration of the occurrence frequency and transmission frequency of the logical channels for MBMS. Therefore, the mobile communication system supporting the MBMS has an advantage of efficiently using the radio resources.

1 is a diagram illustrating a network structure of a third generation asynchronous mobile communication system supporting multimedia broadcasting / multi-broadcast service (MBMS).

2 is a diagram illustrating a protocol structure of a wireless access network in a third generation mobile communication network.

3 is a diagram illustrating a medium access control (MAC) layer for distinguishing an MBMS control channel and an MBMS data channel according to an embodiment of the present invention.

4 is a flowchart illustrating operations of a radio network controller (RNC) according to an embodiment of the present invention.

5 is an operation flowchart of a user equipment (UE) according to the method proposed in the present invention.

Claims (9)

In a mobile communication system comprising one or more user terminals, a wireless access network for providing a broadcast service for each service to the user terminals, and a core network connected to the wireless access network to provide the broadcast service, the logic according to the broadcast service. In a method of distinguishing a channel from a logical channel supporting another mobile communication service, Allocating each identifier so as to distinguish a data channel transmitting data according to the broadcast service and a control channel transmitting control information according to the broadcast service from logical channels according to another service; And mapping the data channel to which each identifier is assigned and the control channel to a forward access channel and transmitting the same to a user terminal. The method of claim 1, The identifier for the data channel and the control channel according to the broadcast service is assigned to a length of 4 bits according to the frequency of use. The method of claim 2, And an identifier for a secondary control channel for transmitting limited control information according to the broadcast service is allocated with a length of 5 to 8 bits. The method of claim 2, The identifier of the data channel for transmitting data according to the broadcast service is assigned to a target channel type field with a value of '0' and is mapped to the forward access channel independently of logical channels according to other services. The method characterized in that. The method of claim 2, An identifier of the control channel for transmitting control information according to the broadcast service is assigned to a target channel type field with a value of '1000' and is mapped to the forward access channel independently of logical channels according to other services. The method characterized in that. The method of claim 3, wherein An identifier of the secondary control channel for transmitting limited control information according to the broadcast service is assigned to a target channel type field with a value of '1001' and mapped to the forward access channel independently of logical channels according to other services. The method characterized in that it comprises a. In a mobile communication system comprising one or more user terminals, a wireless access network providing a broadcast service for each of the user terminals by service, and a core network connected to the wireless access network to provide the broadcast service. In a method of distinguishing a logical channel according to a service and a logical channel supporting another mobile communication service,  It is determined whether the radio access network sets logical channels supporting the broadcast service in consideration of resource information according to the broadcast service, and separately allocates the configured logical channels to the forward access channel separately from logical channels according to other services. Process, Assigning logical channels according to the broadcast service to identifiers having variable lengths in consideration of the frequency of use and allocating the logical channels to the forward access channel according to the checking result; And transmitting the forward access channel to the user terminal. In the mobile communication system comprising one or more user terminals, a wireless access network for providing a broadcast service for each service to the user terminals, and a core network connected to the wireless access network to provide the broadcast service. In a method of distinguishing a logical channel according to a service and a logical channel supporting another mobile communication service, Receiving, by a user terminal, a broadcast channel including identifiers of logical channels according to the broadcast service; After receiving a forward access channel through a secondary common control physical channel, identifying logical channels according to the broadcast service using the identifier; And receiving the broadcast service through the logical channel. In a mobile communication system comprising one or more user terminals, a wireless access network for providing a broadcast service for each service to the user terminals, and a core network connected to the wireless access network to provide the broadcast service, the logic according to the broadcast service. An apparatus for distinguishing a channel from a logical channel supporting another mobile communication service,  A controller configured to set an identifier variable according to a frequency of use so as to distinguish a data channel transmitting data according to the broadcast service and a control channel transmitting control information from logical channels according to another service; A multiplexing block for multiplexing the data channel and the control channel with independent identifiers set according to the control of the controller; A scheduler for determining a transmission rank of the data channel and the control channel according to the broadcast service and logical channels according to another service; And a transmission type combination selection block for determining a transmission format of a secondary common control physical channel for transmitting the data channel and the control channel to which the control channel is allocated according to the transmission rank. The method.