KR101044862B1 - Method for transmitting service information between network nodes for mbms service in mobile communication system - Google Patents

Abstract

In a wireless system providing one or more multicast and broadcast data (MBMS) services, a method of transmitting service information between network nodes (RNC) for an MBMS service according to the present invention is performed by one terminal from a first network node to a second network. When moving to a cell managed by a node, the first network node receives state information of the cell from a second network node (or a third network node), and when a specific terminal moves to the cell, connects MBMS to the second network node. Optionally send a request message. In this case, the state information includes MBMS service region information and / or MBMS function support information of a neighbor cell for MBMS service subscribed to a specific terminal.

Status information, MBMS connection request message, information transfer between network nodes

Description

METHOD FOR TRANSMITTING SERVICE INFORMATION BETWEEN NETWORK NODES FOR MBMS SERVICE IN MOBILE COMMUNICATION SYSTEM}

1 is a diagram illustrating a network structure of a UMTS to which the prior art and the present invention are applied.

2 is a diagram illustrating a connection structure between a UTRAN and a terminal in a UMTS network.

3 is a diagram illustrating a process in which a UMTS network provides a specific MBMS service (service 1) using a multicast mode.

4 is a diagram illustrating a UE linking process.

5 is a diagram illustrating an MBMS attach process.

6 is a diagram illustrating a process in which an SRNC receives a general lu signaling message from a CN and adds a neighbor cell information list according to the present invention.

7 is a diagram illustrating a process in which an SRNC adds a neighbor cell information list by receiving an MBMS UE combining message from a CN;

8 is a diagram illustrating a process in which an SRNC receives an MBMS session start message from a CN and adds a neighbor cell information list according to the present invention.

9 is a diagram illustrating a process in which an SRNC adds a neighbor cell information list by receiving an MBMS connection response message from a DRNC.                 

FIG. 10 is a diagram illustrating a process in which an SRNC receives a radio link establishment request message from a DRNC and adds a neighbor cell information list; FIG.

The present invention relates to a multicast or broadcast service (MBMS) in a mobile communication system, and more particularly, to a method of transmitting service information between network nodes (elements) when a terminal moves from one RNC to another RNC.

UMTS (Universal Mobile Telecommunications System) is a third generation mobile communication system that has evolved from the European standard Global System for Mobile Communications (GSM) system.It is based on GSM Core Network and Wideband Code Division Multiple Access (WCDMA) access technologies. The aim is to provide a better mobile communication service.

1 is a diagram illustrating a network structure of a UMTS to which the prior art and the present invention are applied.

As shown in FIG. 1, the UMTS system is largely composed of a terminal, a UTRAN, and a core network (CN). The UTRAN is composed of one or more Radio Network Sub-systems (RNS), and each RNS is a Radio Network Controller (RNC) and one or more Node Bs managed by the RNC. It is composed. The Node B is managed by the RNC, and receives the information transmitted from the physical layer of the terminal in the uplink, and transmits data to the terminal in the downlink, and serves as an access point of the UTRAN for the terminal. The RNC is in charge of allocating and managing radio resources and serves as an access point to the core network.

2 is a diagram illustrating a connection structure between a UTRAN and a terminal in a UMTS network. 2, in order to receive a service provided by UMTS, a terminal must be connected to a core network, and information on the terminal and the core network is transmitted via the UTRAN. The core network and the RNC are connected through the Iu interface to exchange data and control messages. Each terminal connected to the UMTS network is managed by a specific RNC in the UTRAN. At this time, the RNC managing the terminal is called a SRNC (Serving RNC). That is, the SRNC refers to an RNC serving as an access point with a core network for data transmission of a specific terminal.

The SRNC serves as a second layer of OSI (Open System Interface) for data received through the air interface or transmitted to the terminal, and allocates a radio resource suitable for providing a service. The radio resource management function of the SRNC includes all control functions related to a specific terminal such as transmission channel setting, handover decision, and open loop power control. And, at a specific point in time, the terminal connected to the core network through the UTRAN has only one SRNC.

Normally, one RNC is used for the connection between the UE and the RNC. However, when the UE moves to an area in which another RNC is in charge, the UE connects to the SRNC via the RNC of the moved area.

For example, if the UE was initially connected through R1 (RNC 1) but later moved to a cell managed by R2 (RAN 2), the UE is connected to R1 through the Iur interface via R2. The management of the terminal and the role of the access point between the core network are still performed by R1, and R2 performs a partial function of simply routing user data or allocating a code that is a common resource.

In the UMTS network, like R2, all RNCs connected to the UE except for SRNC are called DRNC (Drift RNC). As such, one terminal may not have a DRNC according to a connection state, and may have one or several DRNCs.

SRNC and DRNC exchange signaling messages such as uplink signaling message, radio link establishment message and radio link addition message through Iur interface.

The division of the SRNC and the DRNC is a logical division associated with a specific terminal. Since the relationship between RNC and Node B in UTRAN is dependent, RNC can be distinguished from Node B side. That is, to distinguish between the RNC managing Node B and other RNCs, an RNC in charge of managing a specific Node B is referred to as a Controlling RNC (CRNC). More specifically, the RNC connected to the Node B and the Iub and controlling the radio resource of the Node B corresponds to the CRNC of the Node B. In the structure of UTRAN, CRNC and Node B have a one-to-many relationship. The CRNC performs load control and congestion control of traffic in a cell managed by the CRNC and an admission control and code allocation function for a new radio link configured in these cells.

In the third layer of the radio protocol located in the RNC and the terminal, a radio resource control (RRC) layer is defined. The RRC is in charge of controlling transport channels and physical channels in connection with setting, resetting, and releasing radio bearers. In this case, the radio bearer refers to a service provided by the second layer of the radio protocol for data transmission between the terminal and the RNC. In general, the radio bearer is configured to indicate characteristics of a protocol layer and a channel necessary to provide a specific service. The process of defining and setting each specific parameter and operation method.

When the RRC layer of a specific terminal and the RRC layer of the RNC are connected to each other to send and receive RRC messages, the terminal is in an RRC connected mode and when the terminal is not connected, the terminal is in an RRC connected mode. It is in the RRC Idle Mode. When the terminal establishes an RRC connection with the RNC, a SRNC (Serving RNC) is generated in the RNC to directly manage the terminal, and then the RNC identifies and manages the terminal in units of cells.

On the other hand, the UE in the RRC idle mode cannot be identified by the RNC, so the CN (MSC or SGSN) manages the location area or routing area unit that is larger than the cell. That is, since the terminal in the RRC idle mode is identified only in a large area unit, the terminal should be in the RRC connected mode by establishing an RRC connection with the RNC in order to receive a normal mobile communication service such as voice or data.

Hereinafter, a multimedia broadcast / multicast service (MBMS) will be described in detail.

MBMS refers to providing a streaming or background service to a plurality of terminals using a dedicated MBMS bearer service. In UTRAN, MBMS bearers use point to multipoint radio bearers and point to point radio bearer services. MBMS can be supported only in the R6 version of UMTS system that provides the function for MBMS. For example, among the UMTS systems such as R99, R4, and R5 and the R6 UMTS system, the MBMS function is not provided.

The MBMS is divided into a broadcast mode and a multicast mode. The MBMS broadcast mode is a service for transmitting multimedia data to all users in a broadcast area, and the MBMS multicast mode transmits multimedia data only to a specific user group in a multicast area. It is a service. In this case, the broadcasting area refers to an area in which a broadcast service is possible, and the multicast area refers to an area in which a multicast service is available, and the broadcasting area and the multicast area are called service areas.

3 is a diagram illustrating a process in which a UMTS network provides a specific MBMS service (service 1) using a multicast mode, and shows an example of a process in which a UE receives a specific service (service 1).

Referring to FIG. 3, first, a UE1 wishing to receive an MBMS service should perform a subscription procedure. In this case, the subscription refers to the act of establishing a relationship between a service provider and a user. In addition, terminals to receive the MBMS service must receive a service announcement (service announcement) provided by the network. Here, the service guide refers to a function of notifying the terminal of a list of services to be provided in the future and related information.

The terminal that wants to receive the MBMS service in the multicast mode must specifically join a multicast group, that is, a group of terminals that receive a specific multicast service. In this case, the participation refers to a process in which a terminal joins a multicast group gathered to receive a specific multicast service. Through the participation process, the UE can inform the UMTS network of the intention to receive specific multicast data. On the contrary, a process in which a terminal participating in a specific multicast group terminates participation in the multicast group is called leave. The joining, joining and withdrawing process is a process performed for each terminal, and the terminal may perform the joining, joining and leaving process at any time before, during, or after data transmission.

While a particular MBMS service is in progress, one or more sessions for that service may occur sequentially. When data to be transmitted for a particular MBMS service occurs in an MBMS data source, the CN informs the RNC of a session start. On the other hand, when there is no more data to be transmitted for a particular MBMS service in the MBMS data source, the CN informs the RNC of the session stop. A data transfer process for a specific MBMS service may be performed between the session start and the session stop. In this case, only terminals that participate in a multicast group for a specific MBMS service may receive data transmitted through the data transmission process.

In the session initiation process, the RNC receiving the session initiation from the CN transmits an MBMS notification to the terminals. Here, MBMS notification refers to a function in which the RNC informs the UE that data transmission of a specific MBMS service is imminent in a cell. The MBMS notification is transmitted more than once before the actual data of the service is transmitted. The RNC may perform a counting function to determine the number of UEs that want to receive a specific MBMS service in a specific cell using the MBMS notification process.

The aggregation function is used to determine whether to set a wireless bearer that provides a specific MBMS service in a point-to-many, point-to-point or no wireless bearer. The RNC selects the MBMS radio bearer by comparing the total number of terminals with an internally set threshold. That is, after performing the aggregation function, the RNC sets up a point-to-point MBMS radio bearer when the number of terminals present in the cell is less than the threshold, and when the number of terminals in the cell is larger than the threshold, the point-to-point MBMS. Wireless bearer can be set. After setting the MBMS radio bearer, the RNC informs the terminals of the information of the corresponding radio bearer.

When the point-to-point radio bearer is configured for a specific service, all terminals to receive the service are in an RRC connected mode. However, when a point-to-multipoint radio bearer is configured for a specific service, all of the terminals to receive the service need not be in the RRC connected mode. That is, the terminal in the RRC idle mode can also receive the point-to-multipoint radio bearer. However, if there is no terminal that wants a specific MBMS service as a result of the aggregation process, the RNC does not transmit the MBMS data without setting the radio bearer. That is, even if there is no user who wants the service, it is a waste of radio resources for the RNC to configure the radio bearer.                         

In addition, when the data of the MBMS service is transmitted during one session of the MBMS service from the core network, the RNC starts transmitting data using the configured radio bearer, and releases the preset radio bearer when the session is interrupted from the core network.

The MBMS service area refers to an area where a specific MBMS service subscribed to a specific terminal is available. The MBMS service area may be represented by one or more cells, and may be included in an area managed by one RNC or in an area managed by several RNCs. The list of neighboring cell information refers to a list in which the RNC lists information of cells managed by the DRNC located in the neighborhood thereof.

4 is a diagram illustrating an MBMS UE linking process.

As shown in FIG. 4, the MBMS UE combining process means that the SRNC registers a specific UE subscribed to a specific MBMS service to an MBMS service context managed by the SRNC. The MBMS service content includes information necessary for managing a specific MBMS service in the UTRAN. The SRNC receives an MBMS UE linking request message from the CN when a specific UE subscribed to a specific MBMS service moves to a cell in charge thereof (S10). Accordingly, the SRNC registers information about the terminal in the contents of the MBMS service for the MBMS service and transmits an MBMS terminal association response message to the CN (S11). If there is no MBMS service content for the MBMS service, the MBMS service content is newly generated.

5 is a diagram illustrating an MBMS attach process.                         

Referring to FIG. 5, an RNC providing an MBMS service identifies and manages a terminal in an RRC connected mode among terminals participating in a specific MBMS service for each cell in charge thereof. To this end, the RNC creates an RRC connected mode terminal list for each MBMS service of each cell. In this case, the RRC connected mode terminal list includes identifiers (URNTI) of terminals participating in a specific MBMS service.

In the MBMS connection process, for the MBMS service that is in progress among the MBMS services joined by the UE in the RRC connected mode, when the UE moves from a cell in charge of the SRNC to a cell in charge of the DRNC, the SRNC sends the UE information. By the DRMS through the MBMS connection request message, the DRNC adds a terminal requesting MBMS connection to the RRC connection mode terminal list managed by the DRNC.

On the other hand, for the MBMS service that is not in progress among the MBMS services joined by the terminal, the terminal moves from the cell in which the SRNC is responsible to the cell in which the DRNC is responsible, and then SRNC starts a session from the CN for the MBMS service. When receiving the message, the SRNC transmits the terminal information to the DRNC through an MBMS connection request message, and means that the DRNC adds the terminal requesting the MBMS connection to the RRC connected mode terminal list. In this case, the MBMS connection request message includes the ID of the cell to which the terminal has moved, the ID of the MBMS service in which the terminal is participating, and the terminal identifier (URNTI).

When receiving the MBMS connection request message for the specific terminal from the SRNC (S20), if the DRNC can allocate resources for maintaining the RRC connection mode state to the terminal, accepts the MBMS connection request of the terminal, The terminal identifier is added to the RRC connected mode terminal list for the MBMS service in which the terminal participates (MBMS service of the cell to which the terminal has moved). After that, the DRNC transmits an acknowledgment through the MBMS connection response message to the SRNC (S21), and the SRNC receiving the SRNC keeps the UE in the RRC connected mode even in the cell to which the UE moves, using a point-to-point radio bearer. The MBMS service data is transmitted to the terminal. That is, the MBMS service data is transmitted to the DRNC through the SRNC and then to the terminal using the point-to-point radio bearer in the DRNC.

The DRNC does not always accept the MBMS connection request message for the specific UE from the SRNC. If the DRNC does not have a resource for establishing an RRC connection to the terminal and maintain the RRC connection mode, the DRNC rejects the MBMS connection request of the terminal and transmits a negative response to the SRNC.

However, the related art has the following problems when the SRNC transmits an MBMS connection request message to the DRNC.

Conventionally, when a specific UE moves to a cell managed by the DRNC, the SRNC always transmits an MBMS connection request message to the DRNC regardless of the state of the cell. However, if the DRNC cell to which the UE moves is not included in the MBMS service area of the MBMS service to which the UE participates, the DRNC cell cannot provide the MBMS service to which the UE participates. In this case, the SRNC does not need to transmit the MBMS connection request message for the MBMS service to the cell of the DRNC which cannot provide the MBMS service.

In addition, if the DRNC or Node B to which the UE moves does not support the MBMS function, the cell cannot provide the MBMS service to which the UE participates. Even in this case, the SRNC does not need to transmit the MBMS connection request message to the DRNC managing the cell.

However, in the related art, the SRNC may unnecessarily transmit the MBMS connection message to the DRNC because the DRNC to which the UE moves does not know such a state even though the reception of the MBMS connection message is unnecessary. The unnecessary MBMS connection message transmission increases the signaling load between the SRNC and the DRNC, resulting in increased congestion in the network and lowering efficiency of network resource usage.

Accordingly, an object of the present invention is to provide an efficient service information transmission method between network nodes (elements) when performing an MBMS service.

Another object of the present invention is to provide a service information transmission method capable of reducing congestion in a network by reducing signaling load between SRNC and DRNC when performing MBMS service.

Another object of the present invention is to provide a service information transmission method for an MBMS service that can increase the efficiency of network resource usage by the SRNC selectively transmits an MBMS connection request message to the DRNC when the UE moves from one RNC to another RNC. To provide.

In order to achieve the above object, in the method of transmitting service information between network nodes for MBMS service according to an embodiment of the present invention, when one terminal moves from a first network node to a cell managed by a second network node The first network node receives the state information of the cell from a third network node and selectively transmits an MBMS connection request message to the second network node based on the stored state information when a specific terminal moves to the cell later. .

Preferably, the first network node transmits an MBMS connection request message to the second network node only when the cell is a specific MBMS service area or supports an MBMS function.

Preferably, the first to third network nodes are SRNC, DRNC and core network (CN), respectively.

Preferably, the status information includes MBMS service region information and / or MBMS function support information of a neighbor cell for the MBMS service subscribed to by the terminal, the Iu interface signaling message and the MBMS terminal combined message of the second network node. And an MBMS session initiation message. In this case, the Iu interface signaling message includes whether the neighbor cell supports the MBMS function, and the MBMS terminal combining message and the MBMS session initiation message include MBMS service region information and MBMS function support information of the neighbor cell.

In order to achieve the above object, according to another embodiment of the present invention, a method for transmitting service information between network nodes for an MBMS service includes a case in which one terminal moves from a first network node to a cell managed by a second network node. The first network node requests the transmission of the state information of the cell to the second network node, and when a specific terminal moves to the cell later, an MBMS connection request message is selectively transmitted to the second network node according to the transmitted state information. send.

Preferably, the first network node transmits an MBMS connection request message to the second network node only when the cell is a specific MBMS service area or supports an MBMS function.

Preferably, the first and second network nodes are SRNC and DRNC, respectively.

Preferably, the status information is transmitted through a response message to one of the MBMS connection request message, the radio link establishment request message and the radio link addition message of the first network node. In addition, the MBMS connection request message includes MBMS service region information of a neighbor cell, and the radio link setup request message and a radio link add message include MBMS service region information and MBMS function support information of a neighbor cell.

The present invention is implemented in a mobile communication system such as a universal mobile telecommunications system (UMTS) developed by 3GPP. However, the present invention can also be applied to communication systems operating according to other standards. Hereinafter, preferred embodiments of the present invention will be described in detail.

According to the present invention, when a specific UE moves to a cell managed by a DRNC, the SRNC does not always transmit the MBMS connection request message to the DRNC regardless of the state of the cell, but the SRNC sends the MBMS connection request message to the DRNC only when necessary. Suggest ways to do it. To this end, SRNC receives and stores MBMS service region information and MBMS function provision information of neighbor cells from the interface (Iu or Iur) when the MBMS connection process is performed by DRNC, and transmits MBMS connection request message based on the information. Determine.

In the present invention, information indicating whether a specific cell managed by the RNC provides an MBMS function is referred to as MBMS capability availability information. Preferably, whether the MBMS function support information for the cell is RNC managing the cell or the version of Node B providing radio resources to the cell is lower than R6 or R6, and does not have a function to support the MBMS service. Has information that the MBMS function cannot be supported. In addition, when the RNC managing the cell and the Node B providing radio resources to the cell have a function of supporting an MBMS service, the RNC managing the cell has information that the MBMS function can be supported.

In the present invention, the SRNC receives state information, that is, MBMS service region information of a neighboring RNC or a cell managed by the RNC from a core network (CN) connected with the SRNC. In addition, the SRNC receives MBMS service area information subscribed to the terminal of the cell to which the terminal has moved from the DRNC of the cell to which the specific terminal has moved. If it is determined that the cell is not an MBMS service area for an MBMS service based on the state information, the SRNC manages the cell to send an MBMS connection request message for the MBMS service when a specific UE moves to the cell. Do not send to the terminal, do not provide the MBMS service to the terminal or provide a point-to-point service.

In addition, in the present invention, the SRNC receives information on whether to support the MBMS function of a neighbor RNC or a cell managed by the RNC from a CN connected with the SRNC. In addition, the SRNC receives information on whether to support the MBMS function of the cell to which the terminal is moved from the DRNC of the cell to which the specific terminal is moved. Accordingly, when the SRNC determines that the cell does not support the MBMS function, when the specific terminal moves to the cell later, the SRNC does not send an MBMS connection request message for all MBMS services to the DRNC managing the cell. Do not provide MBMS service or provide point-to-point service.

The SRNC may receive MBMS service region information or MBMS function support information of a neighbor cell from a CN connected with the SRNC.

6 is a diagram illustrating a procedure in which an SRNC receives a general lu signaling message from a CN and adds a neighbor cell information list.

As shown in FIG. 6, the SRNC receives a general lu signaling message from the CN (S30). The Iu signaling message may include status information of a neighboring RNC or a cell managed by the RNC, that is, whether to support MBMS function, and the CN may transmit a general Iu signaling message to the SRNC regardless of MBMS service.

The SRNC identifies MBMS function support information of the neighboring RNC included in the Iu signaling message or a cell managed by the RNC, and then adds the identified MBMS function support information to the neighbor cell information list (S31). Accordingly, the SRNC determines whether the cell supports the MBMS function when a specific UE moves to the cell by using the MBMS function support information. As a result of determination, if the cell does not support the MBMS function, the SRNC does not send an MBMS connection request message for all MBMS services to the DRNC managing the cell, and does not provide all the MBMS services to the terminal or provide a point-to-point service. .

7 is a diagram illustrating a process in which an SRNC receives a MBMS UE combining message from a CN and adds a neighbor cell information list.

As shown in FIG. 7, the SRNC receives an MBMS UE combining message from the CN (S40). In this case, the MBMS UE combining message includes neighbor cell MBMS service region information for MBMS services subscribed to a specific terminal and MBMS service function support information of neighbor cells for all MBMS services.

The SRNC identifies the state information of the neighbor cell included in the message, that is, the MBMS service region information and the MBMS function support information of the neighbor cell, and then adds the identified MBMS service region information to the neighbor cell information list (S41). After that, when a specific UE moves to the cell, the SRNC determines whether the cell is an MBMS service area of an MBMS service based on the state information. If it is determined that the cell is not the MBMS service area of the MBMS service, the SRNC does not send an MBMS connection request message for the MBMS service to the DRNC managing the cell, and does not provide the MBMS service to the terminal or provide a point-to-point service. to provide.

In addition, the SRNC may add the MBMS function support information of the neighbor cell to the neighbor cell information list. In this case, when a specific terminal moves to the cell later, if it is determined that the cell does not support the MBMS function, the MBMS connection request message for all MBMS services is not sent to the DRNC managing the cell, and all the MBMS services are provided to the terminal. Or point-to-point services.

8 is a diagram illustrating a process in which an SRNC receives a MBMS session start message from a CN and adds a neighbor cell information list.

First, the SRNC receives an MBMS session start message from the CN (S50). The MBMS session initiation message includes neighbor cell MBMS service region information for MBMS services subscribed to a specific terminal and MBMS service function support information of neighbor cells for all MBMS services.

The SRNC identifies the MBMS service region information of the neighboring cell and MBMS function support information of the neighboring cell included in the message, and then adds the MBMS service region information to the neighboring cell information list (S51). Subsequently, when a specific UE moves to the cell, if it is determined that the cell is not an MBMS service area of the MBMS service, the SRNC does not send an MBMS connection request message for the MBMS service to the DRNC that manages the cell. Do not provide MBMS service or provide point-to-point service.

In addition, the SRNC may add the MBMS function support information of the neighbor cell to the neighbor cell information list. Therefore, when a specific terminal moves to the cell later, if it is determined that the cell does not support the MBMS function, the MBMS connection request message for all MBMS services is not sent to the DRNC managing the cell, and all MBMS services are transmitted to the terminal. Do not provide or provide point-to-point services.

9 is a diagram illustrating a process in which an SRNC receives a MBMS connection response message from a DRNC and adds a neighbor cell information list.

Referring to FIG. 9, when the terminal moves to a cell managed by the DRNC, the SRNC detects the movement of the terminal and transmits an MBMS connection request message for the MBMS service received by the terminal to the DRNC (S60). The DRNC transmits an MBMS connection response message to the SRNC in response to the MBMS connection request message (S61). In this case, the MBMS connection response message includes MBMS service region information of the cell to which the terminal has moved.

The SRNC receives the MBMS connection response message from the DRNC, checks the MBMS service region information of the cell to which the terminal has moved, and adds the checked MBMS service region information to the neighbor cell information list (S62). After that, when a specific UE moves to the cell, the SRNC does not send an MBMS connection request message for the MBMS service to the DRNC that manages the cell if it is determined that the cell is not an MBMS service area of the MBMS service. Provide no service or provide point-to-point service.

In addition, in the present invention, the SRNC uses the uplink signaling forwarding message, the radio link establishment message, and the radio link addition message to inform the MBNC of service area information about the MBMS service of all neighboring cells and information on whether the neighboring cell supports MBMS function from the DRNC. Can be received.

10 is a diagram illustrating a process in which an SRNC receives a radio link establishment request message from a DRNC and adds a neighbor cell information list.

As shown in FIG. 10, when the terminal moves to a cell managed by the DRNC, the SRNC detects the movement of the terminal and transmits a radio link establishment request message to the DRNC for establishing a radio link for the terminal (S70). The DRNC transmits a radio link establishment response message for the radio link establishment request message to the SRNC (S71), wherein the radio link establishment response message includes MBMS service region information for all MBMS services of a cell to which the terminal has moved. Information on whether the MBMS function is supported is included.                     

Accordingly, the SRNC receives the link establishment response message from the DRNC, checks the MBMS service region information of the cell to which the terminal has moved, and then adds the corresponding MBMS service region information to the neighbor cell information list (S72). After that, when the specific UE moves to the cell, if the SRNC determines that the cell is not the MBMS service area of the specific MBMS service, the SRNC does not send an MBMS connection request message for the MBMS service to the DRNC that manages the cell. Provide no service or provide point-to-point service.

In addition, the SRNC may check the MBMS function support information of the cell to which the terminal has moved and add the information to the neighbor cell information list. In this case, when a specific terminal moves to the cell afterwards, if the SRNC determines that the cell does not support the MBMS function, the SRNC does not send an MBMS connection request message for all MBMS services to the DRNC managing the cell. Do not provide MBMS service or provide point-to-point service.

As described above, in the present invention, when a specific UE moves to a cell managed by the DRNC, the SRNC does not always transmit an MBMS connection request message to the DRNC regardless of the state of the cell, but only when the SRNC needs the MBMS connection request message to the DRNC. Send it.

That is, in the present invention, the SRNC receives and stores MBMS service region information and MBMS function support information of a neighbor cell from CN or DRNC, and moves a cell to which a specific terminal moves based on the stored information. If it is not or does not support the MBMS function does not send the MBMS connection request message to the DRNC managing the cell, and does not provide the MBMS service to the terminal or provides a point-to-point service.

Therefore, the present invention has an effect of increasing network usage efficiency by preventing network load increase between RNCs by reducing unnecessary message transmission generated between RNCs when the UE moves from one RNC to another RNC.

In addition, although the present invention has been described with reference to the embodiments illustrated in the drawings, this is merely exemplary and will be understood by those skilled in the art that various modifications and equivalent other embodiments are possible. . Therefore, the true technical protection scope of the present invention will be defined by the technical spirit of the appended claims.

Claims (23)

A method of transmitting service information between network nodes in a wireless system providing one or more multicast and broadcast data (MBMS) services, When one terminal moves from a first network node to a cell managed by a second network node, the first network node receives the state information of the cell from a third network node. . The method of claim 1, wherein the status information Method for transmitting service information between network nodes, characterized in that the MBMS service area information and / or MBMS function support information of the neighboring cell for the MBMS service subscribed to the terminal. The method of claim 1, wherein the status information And transmitting the service information between the network nodes through one of an Iu interface signaling message, an MBMS terminal combined message, and an MBMS session initiation message of the third network node. The method of claim 3, wherein the Iu interface signaling message is And whether the neighbor cell supports the MBMS function, and the MBMS terminal combining message and the MBMS session initiation message include MBMS service region information and MBMS function support information of the neighbor cell. The method of claim 1, wherein the first network node Between the network nodes, the state information received from the third network node is stored in the neighbor cell information list, and when a specific terminal moves to the cell, the MBMS connection request message is transmitted to the second network node according to the stored state information. How to send service information. The method of claim 5, wherein the first network node And transmitting an MBMS connection request message to the second network node only when the cell is a specific MBMS service area or supports an MBMS function. The method of claim 5, wherein the first network node An SRNC managing a specific terminal, wherein the second network node is a radio network controller (DRNC) of a cell to which the terminal moves, and the third network node is a core network. Information transmission method. delete delete delete delete delete A method of transmitting service information between network nodes in a wireless system providing one or more multicast and broadcast data (MBMS) services, When one terminal moves from a first network node to a cell managed by a second network node, the first network node receives state information of the cell from a third network node, and when the specific terminal moves to the cell later, the state And selectively transmitting an MBMS connection request message to the second network node according to the information. The method of claim 13, wherein the first network node Storing the status information in a neighboring cell information list, and transmitting an MBMS connection request message to the second network node only when the cell is a specific MBMS service area or supports an MBMS function. . delete delete delete delete delete delete delete delete delete

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