KR20150030885A

KR20150030885A - Methods and apparatuses for Group Communication Configuration

Info

Publication number: KR20150030885A
Application number: KR20130110181A
Authority: KR
Inventors: 홍성표; 최우진
Original assignee: 주식회사 케이티
Priority date: 2013-09-13
Filing date: 2013-09-13
Publication date: 2015-03-23

Abstract

The present invention provides a group communication through an LTE / LTE-A mobile communication network, in which a terminal belonging to the same group can receive group communication using a multimedia broadcast and multicast service (MBMS) for downlink transmission A method for transmitting group communication control information according to an embodiment of the present invention includes transmitting at least one of information indicating that group communication is established and information about termination of data transmission for group communication Generating group communication control information including group communication control information and transmitting group communication control information to a base station.

Description

[0001] METHOD AND APPARATUS FOR GROUP COMMUNICATION CONFIGURATION [0002]

The present invention provides a group communication through an LTE / LTE-A mobile communication network, in which a terminal belonging to the same group can receive group communication using a multimedia broadcast and multicast service (MBMS) for downlink transmission &Lt; / RTI > Specifically, the present invention includes a method of transmitting control information of group communication using an MBMS channel.

A method for transmitting group communication control information according to an exemplary embodiment of the present invention includes transmitting group communication control information including group communication Generating control information and transmitting group communication control information to the base station.

1 is a diagram showing an E-UTRAN MBMS structure.
2 is a diagram showing a layer 2 model for one MBSFN area.
3 is a diagram illustrating an MCCH information acquisition and an MBMS user data reception procedure.
4 is a diagram illustrating a group communication procedure through LTE / LTE-A according to an embodiment of the present invention.
5 is a diagram illustrating a group communication procedure through LTE / LTE-A according to another embodiment of the present invention.
6 is a diagram illustrating a group communication procedure through LTE / LTE-A according to another embodiment of the present invention.
7 is a diagram illustrating a configuration of a base station according to another embodiment of the present invention.
8 is a diagram illustrating a configuration of a user terminal according to another embodiment of the present invention.

Hereinafter, some embodiments of the present invention will be described in detail with reference to exemplary drawings. It should be noted that, in adding reference numerals to the constituent elements of the drawings, the same constituent elements are denoted by the same reference numerals even though they are shown in different drawings. In the following description of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear.

The wireless communication system in the present invention is widely deployed to provide various communication services such as voice, packet data and the like. A wireless communication system includes a user equipment (UE) and a base station (BS, or eNB). The user terminal in this specification is a comprehensive concept of a terminal in wireless communication. It is a comprehensive concept which means a mobile station (MS), a user terminal (UT), an SS (User Equipment) (Subscriber Station), a wireless device, and the like.

A base station or a cell generally refers to a station that communicates with a user terminal and includes a Node-B, an evolved Node-B (eNB), a sector, a Site, a BTS A base transceiver system, an access point, a relay node, a remote radio head (RRH), a radio unit (RU), and a small cell.

That is, the base station or the cell in this specification is interpreted as a comprehensive meaning indicating a partial region or function covered by BSC (Base Station Controller) in CDMA, NodeB in WCDMA, eNB in LTE or sector (site) And covers various coverage areas such as megacell, macrocell, microcell, picocell, femtocell and relay node, RRH, RU, and small cell communication range.

Since the various cells listed above exist in the base station controlling each cell, the base station can be interpreted into two meanings. i) a device itself providing a megacell, a macrocell, a microcell, a picocell, a femtocell, or a small cell in relation to a wireless region, or ii) the wireless region itself. i indicate to the base station all devices that are controlled by the same entity or that interact to configure the wireless region as a collaboration. An eNB, an RRH, an antenna, an RU, an LPN, a point, a transmission / reception point, a transmission point, a reception point, and the like are exemplary embodiments of a base station according to a configuration method of a radio area. ii) may indicate to the base station the wireless region itself that is to receive or transmit signals from the perspective of the user terminal or from a neighboring base station.

Therefore, a base station is collectively referred to as a megacell, a macrocell, a microcell, a picocell, a femtocell, a small cell, an RRH, an antenna, an RU, a low power node (LPN), a point, an eNB, Quot;

Herein, the user terminal and the base station are used in a broad sense as the two transmitting and receiving subjects used to implement the technical or technical idea described in this specification, and are not limited by a specific term or word. The user terminal and the base station are used in a broad sense as two (uplink or downlink) transmitting and receiving subjects used to implement the technology or technical idea described in the present invention, and are not limited by a specific term or word. Here, an uplink (UL, or uplink) means a method of transmitting / receiving data to / from a base station by a user terminal, and a downlink (DL or downlink) .

There are no restrictions on multiple access schemes applied to wireless communication systems. Various multiple access schemes such as Code Division Multiple Access (CDMA), Time Division Multiple Access (TDMA), Frequency Division Multiple Access (FDMA), Orthogonal Frequency Division Multiple Access (OFDMA), OFDM-FDMA, OFDM- Can be used. An embodiment of the present invention can be applied to asynchronous wireless communication that evolves into LTE and LTE-advanced via GSM, WCDMA, and HSPA, and synchronous wireless communication that evolves into CDMA, CDMA-2000, and UMB. The present invention should not be construed as limited to or limited to a specific wireless communication field and should be construed as including all technical fields to which the idea of the present invention can be applied.

A TDD (Time Division Duplex) scheme in which uplink and downlink transmissions are transmitted using different time periods, or an FDD (Frequency Division Duplex) scheme in which they are transmitted using different frequencies can be used.

In a system such as LTE and LTE-A, the uplink and downlink are configured based on one carrier or carrier pair to form a standard. The uplink and the downlink are divided into a Physical Downlink Control Channel (PDCCH), a Physical Control Format Indicator CHannel (PCFICH), a Physical Hybrid ARQ Indicator CHannel, a Physical Uplink Control CHannel (PUCCH), an Enhanced Physical Downlink Control Channel (EPDCCH) Transmits control information through the same control channel, and is configured with data channels such as PDSCH (Physical Downlink Shared CHannel) and PUSCH (Physical Uplink Shared CHannel), and transmits data.

On the other hand, control information can also be transmitted using EPDCCH (enhanced PDCCH or extended PDCCH).

In this specification, a cell refers to a component carrier having a coverage of a signal transmitted from a transmission point or a transmission point or transmission / reception point of a signal transmitted from a transmission / reception point, and a transmission / reception point itself .

The wireless communication system to which the embodiments are applied may be a coordinated multi-point transmission / reception system (CoMP system) or a coordinated multi-point transmission / reception system in which two or more transmission / reception points cooperatively transmit signals. antenna transmission system, or a cooperative multi-cell communication system. A CoMP system may include at least two multipoint transmission / reception points and terminals.

The multi-point transmission / reception point includes a base station or a macro cell (hereinafter referred to as 'eNB'), and at least one mobile station having a high transmission power or a low transmission power in a macro cell area, Lt; / RTI >

Hereinafter, a downlink refers to a communication or communication path from a multiplex transmission / reception point to a terminal, and an uplink refers to a communication or communication path from a terminal to a multiplex transmission / reception point. In the downlink, a transmitter may be a part of a multipoint transmission / reception point, and a receiver may be a part of a terminal. In the uplink, the transmitter may be a part of the terminal, and the receiver may be a part of multiple transmission / reception points.

Hereinafter, a situation in which a signal is transmitted / received through a channel such as PUCCH, PUSCH, PDCCH, EPDCCH, and PDSCH is expressed as 'PUCCH, PUSCH, PDCCH, EPDCCH and PDSCH are transmitted and received'.

In the following description, an indication that a PDCCH is transmitted or received or a signal is transmitted or received via a PDCCH may be used to mean transmitting or receiving an EPDCCH or transmitting or receiving a signal through an EPDCCH.

That is, the physical downlink control channel described below may mean a PDCCH, an EPDCCH, or a PDCCH and an EPDCCH.

Also, for convenience of description, EPDCCH, which is an embodiment of the present invention, may be applied to the portion described with PDCCH, and EPDCCH may be applied to the portion described with EPDCCH according to an embodiment of the present invention.

Meanwhile, the High Layer Signaling described below includes RRC signaling for transmitting RRC information including RRC parameters.

The eNB performs downlink transmission to the UEs. The eNB includes a physical downlink shared channel (PDSCH) as a main physical channel for unicast transmission, downlink control information such as scheduling required for reception of PDSCH, and uplink data channel A physical downlink control channel (PDCCH) for transmitting scheduling grant information for transmission in a Physical Uplink Shared Channel (PUSCH). Hereinafter, the transmission / reception of a signal through each channel will be described in a form in which the corresponding channel is transmitted / received.

Group communication

Group communication is a major function in private mobile radio and public safety systems. Group communication is widely used in the operation of traditional Land Mobile Radio (LMR) systems used for public safety organizations. The main use of group communication services in LMR is to provide Push to Talk (PTT) functionality. Users of group communication services can be organized into groups. A user can be a member of more than one group. Group members may be restricted to receiving and / or transmitting only within the cells corresponding to the area defined by the geographic area. Group communication needs to provide a fast and efficient mechanism for distributing the same content to a plurality of group members in a controlled manner.

E- URTRAN MBMS

Conventional E-UTRAN (Evolved UTRAN) mobile communication networks do not support group communication. Although the E-UTRAN does not support group communication, it can provide a point-to-multipoint service to a plurality of terminals using an e-MBMS (Evolved Multimedia Broadcast Multicast Service or MBMS). A mobile communication service provider can use MBMS over-frequency (MBSFN) technology to provide services such as TV broadcasting through eMBMS. All cells included in the MBSFN transmission can be synchronized (time synchronized) to deliver the same contents to the UEs at the same time. The eMBMS service is provided through an MBMS bearer service in a broadcast mode.

1 is a diagram showing an E-UTRAN MBMS structure.

The MBMS bearer service of the broadcast scheme operates on the structure of FIG.

Hereinafter, each element constituting the structure will be described with reference to FIG.

Broadcast Multicast Service Center (BM-SC): It is possible to start MBMS bearer service transmission through MBMS session control signaling (MBMS Session Start, MBMS Session Stop) as an entity operating as a source of MBMS transmission. The BM-SC may assign a session ID (sessionId) to identify the transmission (or retransmission) of a specific MBMS session together with the Temporary Mobile Group Identity (TMGI) and the TMGI for MBMS bearer service identification.

- MCE (Multi cell / Multi Coordination Entity): participates in MBMS session control signaling and performs admission control and radio resource allocation. When a new MBMS bearer service session is started, the MCE determines whether to set up a radio bearer for the session. The MCE may control the MBMS counting procedure. When the MCE determines the radio configuration of the MBMS bearer service and signals it to the eNBs, the eNBs signal the radio resource configuration sent by the MCE to the UEs via the RRC message.

MBMS gateway: exists between BM-SC and eNBs to forward MBMS user data to eNBs. The MBMS gateway forwards the MBMS user data to the eNBs that join the MBMS service using the IP Multicast protocol.

MBMS channel

The E-UTRAN provides two point-to-multipoint channels for MBMS over the air interface.

- MCCH (Multicast Control Channel): This is a logical channel existing on the control plane of the air interface between the UE and the eNB, and is used to broadcast the MBMS RRC message corresponding to the MBSFN area. The RRC layer of the eNB generates an RRC message based on the MBMS control information received from the MCE. There is a one-to-one relationship between one MBSFN region and one MCCH. The MCCH is mapped to a multicast channel (MCH) transport channel mapped to a physical multicast channel (PMCH) physical channel. One MCCH exists for one MCH. There is a one-to-one correspondence between one MCCH and one MBSFN area.

- MTCH (Multicast Traffic Channel): Used to broadcast MBMS user data related to the MBMS service on a logical channel existing on the user plane of the air interface between the UE and the eNB. The MTCH is also mapped to the MCH and the MCH is mapped to the PMCH. There is a one-to-one correspondence between one MBMS service and one MTCH. One or more MTCHs may be mapped to one MCH.

The cell supporting MBMS notifies the UE about the MCCH information change using the PDCCH. For the MCCH information change notification, the MBMS Radio Temporary Identifier (M-RNTI) is carried on the PDCCH. The UE can monitor only the PDCCH before receiving the user data of the session for the MBMS service of interest. When the UE starts to receive user data for an MBMS service session of interest according to the MCCH information change notification, the UE continuously receives MCCH information related to the session as well as user data for the session on the MTCH.

MBMS hierarchy( Layer ) 2 Structure

2 is a diagram showing a layer 2 model for one MBSFN area.

As shown in FIG. 2, Packet Data Convergence Protocol (PDCP) layer is not applied to MCCH or MTCH, and RLC (Radio Link Control) layer is configured in Unacknowledged Mode (UM). Since Hybrid Automatic Repeat reQuest (HARQ) is not used for data delivery through MCCH and MTCH, reordering of RLC entities configured for MCCH and MTCH is not applied.

In the MAC layer, the eNB may multiplex one or more MTCHs with one MCCH. The MCH Scheduling Information MAC Control Element is used to notify the UEs when the MBMS service user data is scheduled for each MTCH.

MCCH Information

The RRC layer broadcasts MCCH information to inform UEs of MBMS control information. MCCH information is periodically broadcast for each MCCH in each MBSFN region. For periodic repetition of MCCH information, the RRC layer uses the concept of an MCCH repetition period and an MCCH modification period. For reliable delivery of MCCH information, the RRC layer within the eNB repeatedly broadcasts MCCH information of the same content every MCCH repetition period. The eNB may initiate the transmission of the updated MCCH information from the boundary of the MCCH modification period, such as the system information on the BCCH. When the MCCH information needs to be changed, the eNB informs the UE about the MCCH information change by marking the M-RNTI on the PDCCH within one MCCH modification period before the updated MCCH information starts to be transmitted. The PDCCH indicating the M-RNTI can inform the UE about the information on one or more MBSFN areas to which the MCCH information change is related by using 8 bits. The eNB may set the bit to notify the terminal about the beginning of the session or a counting procedure in progress. The MCE informs the eNBs about the configuration of the MCCHs. The RRC layer broadcasts the configuration of the MCCHs through the system information (SIB13). SIB13 is broadcast over a DL-SCH from a single cell as in the normal SIB type. In addition to the SIB 13, the RRC layer provides MCCH information through an MBSFNAreaConfiguration message and an MBMSCountingRequest message.

MBMS Procedure

The network provides MBMS to one or more terminals in the following order.

When the MBMS service session is started, the eNB joins the MBMS service and delivers the MBMS data to one or more UEs.

When the session is started, the UE receives MCCH information related to the MBMS service and sets up an MBMS Point-to-Multipoint radio bearer (hereinafter referred to as "MRB" or "MBMS radio bearer" or "MBMS bearer").

While the eNB is sending a session to one or more terminals, the session may be updated.

When the MBMS service session is stopped, the eNB leaves the MBMS service and ends the MBMS data transmission to one or more UEs.

When the MBMS service session is stopped, the UE receives the updated MCCH information and releases the MRB associated with the MBMS service.

3 is a diagram illustrating an MCCH information acquisition and an MBMS user data reception procedure.

That is, FIG. 3 shows a procedure for a UE to receive user data for an MBMS service session from an eNB. 3, when the UE receives system information for MCCH information reception and receives an MBMS scheduling information message for starting a session with the eNB, the eNB receives an M-RNTI message on the PDCCH within one MCCH modification period, . The eNB then updates the MCCH information broadcast on the MCCH within the next MCCH modification period. If the PDCCH indicates a change in the MCCH information in the MBSFN area, the terminal receives the MCCH to obtain updated MCCH information. Then, the UE sets the MRB corresponding to the session having the updated MCCH information. When the MRB is set, the MTCH and the PMCH corresponding to the MRB are also configured. After setting the MRB, the terminal can receive MBMS user data from the MTCH.

As described above, E-UTRAN-based group communication is not supported in the conventional LTE / LTE-A mobile communication network. Therefore, even when a plurality of terminals are located in one cell, a specific terminal belonging to the same group can transmit control information of the group communication (e.g., information indicating that group communication is established when initiating group communication, Group communication session release information, etc.) and user data information of the group communication, the group communication application server repeats the unicasting to the group terminals that want to receive the group communication, There has been a problem of transmitting data inefficiently.

According to an aspect of the present invention, there is provided a method for controlling a group communication terminal in a LTE / LTE-A mobile communication network, the method comprising: And a method for transmitting group communication control information such as information indicating the transmission of the data, when the transmission is completed, in an efficient manner. It is another object of the present invention to provide a method for providing group communication based on E-UTRAN technology in an LTE / LTE-A mobile communication network.

Hereinafter, embodiments of the present invention for solving the above-mentioned problems will be described in detail.

Group communication terminals belonging to the same group within a specific group area can use the LTE / LTE-A MBMS technology for downlink transmission for group communication in performing group communication. A unicast bearer can be used for uplink transmission. Unicast bearers can also be used for downlink transmissions if MBMS is not supported. Even when MBMS is supported, a unicast bearer can be used for downlink transmission when the number of group member terminals to receive group communication in a cell is less than a predetermined number. A pre-established MBMS bearer between BM-SC and eNBs can be used for fast group communication setup. Alternatively, the group member terminal may request group communication setup of the group member terminal or by a group communication service application server (GCSE AS) or group communication related entity (e.g., group communication control entity Or an MBMS related entity), the MBMS bearer between the BM-SC and the eNBs can be established and used.

A Temporary Mobile Group Identity (TMGI) for identifying a downlink MBMS bearer service for group communication, a session ID for identifying a transmission (or retransmission) of a particular MBMS session, optionally with TMGI, a group communication or group communication area, (Eg, GCSE AS, IMS, PCRF, and other EPS entities) that are assigned by BM-SC or other EPS (Evolved Packet System) entities to control group communication and terminal Can be provisioned. For example, the TMGI, session ID, group communication, group communication area, or MBSFN area identification information for group communication may be stored in a USIM or the like using OMA DM (Open Mobile Alliance Device Management) or OTA (Over The Air) (Eg, registration and setting) between the terminal and a Group Communication Service Enabler (GCSE) application server or group communication related EPS entity through a Non-Access Stratum (NAS) procedure And can be stored in the terminal.

In order for the terminal to receive the downlink transmission for the group communication using the MBMS, the terminal must register with the GCSE application server or group communication related EPS entity. If the GCSE application server or group communication-related EPS entity decides to provide downlink transmission for group communication in a particular cell (s) via the MBMS, the GCSE application server or group communication-related EPS entity is sent to the eNB via BM-SC MBMS session can be started.

When a plurality of terminals are located in one cell, the terminals belonging to the same group can receive control information of group communication (e.g., information indicating that group communication is established when initiating group communication, Information indicating that the transmission has been completed) can be received through the following method.

Method 1 . MCCH Control information of group communication through

4 is a diagram illustrating a group communication procedure through LTE / LTE-A according to an embodiment of the present invention.

It is to be understood that the invention is not limited thereto.

Hereinafter, the communication procedure of each step according to an embodiment of the present invention will be described in detail with reference to FIG.

1) The GCSE application in the terminal requests the group communication setting to the GCSE application server or the EPS entity related to the group communication. The group identifier information for the group communication with which the terminal is subscribed or the terminal is interested in may be included before the group communication setting request or during the group communication setting request, and in response thereto, the TMGI, the session ID, the group communication, And one or more of MBSFN area identification information for communication area or group communication. Alternatively, the above-described TMGI, session ID, group communication, group communication area, or MBSFN area identification information for group communication may be configured in advance in the terminal.

2) The GCSE application server or group communication related EPS entity can set an MBMS bearer for downlink transmission of eNB and group communication or perform MBMS session start procedure through an MBMS related entity such as BM-SC.

3) An MBMS scheduling information procedure may be performed to transmit information indicating at least one of information indicating that an MBMS bearer for downlink transmission of the group communication is established through the MCCH and information on the UE ID that has initiated the group communication.

4) The eNB sends an MCCH message (eg, mbsfnAreaConfiguration-r9, mbmsCountingRequest-r10, or mbmsCountingRequest-10) containing information for indicating that the MBMS bearer for downlink transmission of the group communication is established, New MCCH message). The UE can receive information indicating that an MBMS bearer for group communication downlink transmission is established through the MCCH information, and terminal information that initiates group communication.

5) A terminal desiring to transmit user data (e.g., voice, video, text, push to talk, etc.) through group communication requests group communication to GCSE application server or group communication related EPS entity.

6) A GCSE application server or group A terminal that is authorized to send user data through group communication through the communication-related EPS entity can send a GCSE application server or group communication related EPS entity or MBMS related entity (eg BM-SC, MBMS gateway) and transmits user data for group communication to the eNB.

7) The GCSE application server or group communication related EPS entity or MBMS related entity (BM-SC, MBMS gateway) forwards the user data for the received group communication to the MBMS bearer for downlink transmission of the group communication.

8) After the step 7 or 7, the MBMS scheduling information procedure may be performed to transmit the UE ID information to transmit the group communication user data through the MCCH.

9) The eNB broadcasts an MCCH message (e.g., mbsfnAreaConfiguration-r9, mbmsCountingRequest-r10, or a new MCCH message) containing the UE identifier information to which the group communication user data is to be transmitted. The UE can identify the UE to which the group communication user data is to be transmitted through the MCCH information.

10) The terminal can receive the group communication downlink data through the MBMS.

11) Group communication user data transmission terminal When the terminal ends data transmission or desires to cancel the data transmission, the group communication user data transmission terminal requests the GCSE application server or group communication related EPS entity to release the group communication transmission.

12) The GCSE application server or group communication related EPS entity sends a data transmission release indication of the group communication user data transmission terminal to the eNB through the MBMS related entity (e.g. BM-SC, MBMS gateway).

13) The MBMS scheduling information procedure may be performed to transmit the data transmission release indication information of the group communication user data transmission terminal through the MCCH after step 12 or step 12 above.

14) The eNB broadcasts an MCCH message (eg, mbsfnAreaConfiguration-r9, mbmsCountingRequest-r10, or a new MCCH message) containing a data transmission release indication of the group communication user data sending terminal. The UE can identify that the group communication user data transmission (of the specific terminal) is released through the MCCH information. The terminal can provide the indication to the upper layer.

For MBMS user data carried by the MTCH logical channel, the eNB periodically provides MCH scheduling information at the MAC layer. MCH scheduling information The MAC Control element is included in the first subframe assigned to the MCH in the MCH scheduling period and indicates the position of each MTCH and the unused subframe on the MCH. In step 12, the eNB receiving the data transmission cancellation indication of the group communication user data transmission terminal can transmit the MCH scheduling information to the UE in the MAC layer. Accordingly, the UE may not attempt to receive MBMS that does not include user data.

Alternatively, in step 12, the MCE receiving the data transmission cancellation indication of the group communication user data transmitting terminal from the GCSE application server or the group communication related EPS entity through the MBMS related entity (e.g. BM-SC, MBMS gateway) The MBMS scheduling according to the data transmission cancellation of the user data transmission terminal is changed and transferred to the eNB, and the eNB can transmit the MCH scheduling information to the UE at the MAC layer.

The MCCH including the group communication control information may be repeatedly transmitted with the MCCH including the group communication control information. That is, MCCH message (RRC message) can be repeatedly sent. Or the terminal may send an acknowledgment message to the uplink for the group communication control information.

Method 2 . Separate MTCH Control information of group communication through

5 is a diagram illustrating a group communication procedure through LTE / LTE-A according to another embodiment of the present invention.

This is yet another example for explaining the present invention, and the content of the present invention is not limited thereto.

Hereinafter, the communication procedure of each step according to another embodiment of the present invention will be described in detail with reference to FIG.

2) The GCSE application server or the group communication related EPS entity may transmit MBMS bearer and group communication control information (eg, group communication) for downlink transmission to eNB and group communication user data through MBMS related objects such as BM-SC , Information indicating that the group communication is established, information indicating that the data transmission of the specific UE has been completed through the set group communication session, group communication session releasing information, etc.), or setting an MBMS bearer for downlink transmission The MBMS session start procedure may be performed.

3) Information for indicating that the MBMS bearer (s) for the downlink transmission of the group communication is established through the MCCH, and MBMS scheduling information procedure for transmitting at least one of the information of the UE identifier that initiated the group communication .

4) The eNB sends an MCCH message (eg, mbsfnAreaConfiguration-r9, mbmsCountingRequest-r10, or mbmsCountingRequest) containing information for indicating that the MBMS bearers for downlink transmission of the group communication have been established, New MCCH message). The UE receives information indicating that an MBMS bearer for downlink transmission of group communication user data and an MBMS bearer for downlink transmission of group communication control information are set through MCCH information, .

7) The GCSE application server or group communication related EPS entity or MBMS related entity (e.g. BM-SC, MBMS gateway) or eNB maps user data for received group communication to MBMS bearer for downlink transmission of group communication, do.

8) In order to transmit the UE identifier information to transmit the group communication user data through the MTCH (MBMS bearer for downlink transmission to the group communication control information) after the step 7 or 7, The MBMS scheduling information procedure can be performed.

9) The eNB broadcasts an MTCH (MBMS bearer for downlink transmission for group communication control information) including the UE identifier information to which the group communication user data is to be transmitted. The UE can identify the UE to which the group communication user data is to be transmitted through the MTCH (MBMS bearer for downlink transmission to the group communication control information).

13) To transmit the data transmission cancellation indication information of the group communication user data transmission terminal through the MTCH (MBMS bearer for downlink transmission to the group communication control information) after step 12 or step 12 above The MBMS scheduling information procedure can be performed.

14) The eNB broadcasts an MTCH (MBMS bearer for downlink transmission for group communication control information) including a data transmission release indication of the group communication user data transmitting terminal. The terminal can identify that the group communication user data transmission (of the particular terminal) has been released via the MTCH (MBMS bearer for downlink transmission to the group communication control information). The terminal can provide the indication to the upper layer.

Alternatively, in step 12, the MCE receiving the data transmission cancellation indication of the group communication user data transmitting terminal from the GCSE application server or the group communication related EPS entity through the MBMS related entity (eg BM-SC, MBMS gateway) The MBMS scheduling according to the data transmission cancellation of the user data transmission terminal is changed and transferred to the eNB, and the eNB can transmit the MCH scheduling information to the UE at the MAC layer.

MBMS bearer for downlink transmission to group communication user data and MBMS bearer for downlink transmission to group communication control information can perform different processing in QoS processing by having different logical channels (MTCH). For example, a higher or lower priority MBMS bearer for downlink transmission of group communication control information may be handled at a higher or lower priority than an MBMS bearer for downlink transmission to group communication user data, or a more frequent or less frequent MCCH update time . Or information over the MBMS bearer for downlink transmission to the group communication control information may be repeatedly transmitted. That is, the group communication control information can be repeatedly transmitted. Or the UE may send an acknowledgment message in the uplink for information received via the MBMS bearer for downlink transmission to the group communication control information.

Method 3 . Group communication MTCH Control information of group communication through

6 is a diagram illustrating a group communication procedure through LTE / LTE-A according to another embodiment of the present invention.

Hereinafter, with reference to FIG. 6, the procedure of group communication according to another embodiment of the present invention will be described in detail.

2) The GCSE application server or group communication related EPS entity indicates that the group communication is established when the eNB and the group communication user data and the group communication control information (for example, group communication start) are established through the MBMS related objects such as BM-SC Information indicating whether data transmission of a specific UE has been completed through a set group communication session, group communication session release information, etc.), or to perform an MBMS session start procedure for the MBMS bearer for downlink transmission have.

3) information for indicating that the MBMS bearer (s) for the downlink transmission of the group communication user data and the group communication control information are set through the MCCH, and information indicating one or more of the terminal identifier information that initiated the group communication The MBMS scheduling information procedure can be performed.

4) The eNB sends an MCCH message (eg, mbsfnAreaConfiguration-1) including information for indicating that the MBMS bearer for downlink transmission of the group communication user data and the group communication control information is set, r9, mbmsCountingRequest-r10, or a new MCCH message). The UE can receive information indicating that the MBMS bearer for downlink transmission of the group communication user data and the group communication control information is established through the MCCH information, and the terminal information that initiates the group communication. Alternatively, the eNB may broadcast only the MBMS bearer configuration information (mbsfnAreaConfiguration-r9) for downlink transmission of the group communication user data and the group communication control information, and the UE interested in group communication may configure the MBMS bearer.

5) The eNB transmits information indicating that the group communication is established when the UE attempts to initiate group communication through MTCH (MBMS bearer for downlink transmission of group communication user data and group communication control information) The terminal information is sent. The terminal can receive information indicating that the group communication is established through the MTCH (MBMS bearer for downlink transmission of the group communication user data and the group communication control information), and the terminal information that initiated the group communication.

6) A terminal that wishes to transmit user data (e.g., voice, video, text, push to talk, etc.) through group communication requests group communication to GCSE application server or group communication related EPS entity.

7) GCSE application server or group The terminal which is authorized to send user data through group communication through EPS related object of communication is GCSE application server or group communication related EPS entity or MBMS related entity (eg BM-SC, MBMS gateway) or and transmits user data for group communication to the eNB.

8) GCSE application server or group The EPS entity or MBMS related entity (eg BM-SC, MBMS gateway) or eNB related to the communication communicates the user data for the received group communication to the group communication user data and the group communication control information To the MBMS bearer for forwarding.

9) After step 7 or step 7 above, MTCH (MBMS bearer for downlink transmission of group communication user and group communication control information) The MBMS scheduling information procedure may be performed.

10) The eNB broadcasts MTCH (MBMS bearer for downlink transmission of group communication user data and group communication control information) including the UE identifier information to which the group communication user data is to be transmitted. The UE can identify the UE to which the group communication user data is to be transmitted through the MTCH (MBMS bearer for downlink transmission of the group communication user data and the group communication control information).

13) After the step 12 or the step 12, the MTCH (MBMS bearer for downlink transmission of the group communication user data and the group communication control information) An MBMS scheduling information procedure may be performed to transmit information.

14) The eNB broadcasts an MTCH (MBMS bearer for downlink transmission of group communication user data and group communication control information) including a data transmission release indication of the group communication user data transmitting terminal. The terminal can identify that the group communication user data transmission (of the particular terminal) has been released via the MTCH (MBMS bearer for downlink transmission of group communication user data and group communication control information). The terminal can provide the indication to the upper layer.

For group communication control information, the eNB may repeatedly transmit the group communication user data and the group communication control information described above at the MBMS bearer for downlink transmission to the group communication control information. Or the terminal may send an acknowledgment message to the uplink for the group communication control information.

(Or a GCSE application in the terminal) capable of controlling group communication (or a GCSE application in the terminal) capable of controlling group communication or a terminal having ownership for group communication (or a GCSE application in the terminal) When the control information for releasing the group communication with the downlink transmission of the communication is transmitted to the GCSE application server or the EPS entity related to the group communication, the EPS entity related to the GCSE application server or the group communication includes the MBMS related entity such as BM-SC To release the MBMS bearer to the eNB or to perform the MBMS session stop procedure for the MBMS bearer. The eNB updates the MCCH information to discontinue transmission to the MBMS bearer for the corresponding group communication session and the UE releases the MBMS bearer.

At this time, the control information for canceling the group communication in which the downlink transmission of the group communication through the MBMS is set can be included in the MCCH according to the method 1 described above. As another method for this, control information for canceling group communication in which downlink transmission of group communication through MBMS is set may be included in the MTCH for group communication control information according to the method 2 described above. As another method, the control information for releasing group communication in which the downlink transmission of the group communication through the MBMS is set may be included in the MTCH for the group communication user data and the control information according to the method 3 described above. If the release information is received through the MTCH for the group communication user data and the control information according to the method 3, the UE can release the MBMS bearer. Alternatively, when the eNB transmits the release information via the MTCH for the group communication user data and control information according to the method 3 described above, the eNB or the MCE desires to release the group communication with the GCSE application server or group communication related EPS entity And the GCSE application server or the group communication related EPS entity releases the MBMS bearer to the eNB through an MBMS-related entity such as BM-SC or the like, or transmits a message including information indicating that the MBMS service The MBMS session stop procedure may be performed.

As described above, according to the present invention, when a group communication terminal attempts to initiate group communication in the LTE / LTE-A mobile communication network, information indicating that group communication is established, or when data transmission of a specific terminal is completed through a set group communication session And the group communication control information such as the information indicating this can be efficiently transmitted using the multicast channel.

7 is a diagram illustrating a configuration of a base station according to another embodiment of the present invention.

7, a base station 1000 according to another embodiment includes a control unit 1010, a transmission unit 1020, and a reception unit 1030.

The control unit 1010 receives group communication control information such as information indicating that the group communication is established from the terminal required to perform the above-described present invention or information indicating the completion of data transmission of the specific terminal through the set group communication session And controls the overall operation of the base station according to reception.

The transmitting unit 1020 and the receiving unit 1030 are used to transmit and receive signals, messages, and data necessary for carrying out the present invention to and from the terminal.

8 is a diagram illustrating a configuration of a user terminal according to another embodiment of the present invention.

8, a user terminal 1100 according to another embodiment of the present invention includes a receiving unit 1110, a control unit 1120, and a transmitting unit 1130.

The receiving unit 1110 receives downlink control information, data, and messages from the base station through the corresponding channel.

In addition, the controller 1120 may receive the group communication control information such as information indicating that the terminal required to perform the above-described present invention is set up, information indicating that the group communication is established, And controls the overall operation of the terminal.

The transmitter 1130 transmits uplink control information, data, and a message to the base station through the corresponding channel.

The standard content or standard documents referred to in the above-mentioned embodiments constitute a part of this specification, for the sake of simplicity of description of the specification. Therefore, it is to be understood that the content of the above standard content and portions of the standard documents are added to or contained in the scope of the present invention.

The foregoing description is merely illustrative of the technical idea of the present invention, and various changes and modifications may be made by those skilled in the art without departing from the essential characteristics of the present invention. Therefore, the embodiments disclosed in the present invention are intended to illustrate rather than limit the scope of the present invention, and the scope of the technical idea of the present invention is not limited by these embodiments. The scope of protection of the present invention should be construed according to the following claims, and all technical ideas within the scope of equivalents should be construed as falling within the scope of the present invention.

Claims

A method for a terminal to transmit group communication control information,
Generating the group communication control information including at least one of information indicating that group communication is established and information about end of data transmission for the group communication; And
And sending the group communication control information to a base station.