KR100934708B1 - System and method for supporting multicast broadcasting service in communication system - Google Patents

Abstract

The present invention provides a method for supporting a multicast broadcast service of a wireless communication system, wherein a serving network gateway receives a session start request message from a service server and delivers the multicast broadcast service to a mobile station. Respectively transmit a start request message, the base stations send a session start response message to the serving network gateway corresponding to the session start request message, the serving network gateway sends the session start response message to the service server, Register a data path between the service server and the serving network gateway and the base stations.

Description

System and method for supporting multicast broadcasting service in communication system {SYSTEM AND METHOD FOR SUPPORTING MULTICAST AND BROADCAST SERVICE IN A COMMUNICATION SYSTEM}

The present invention relates to a communication system, and in particular, a service support system and method for providing a user with the MCBCS in a communication system that provides a multicast broadcast service (MCBCS: Multicast and BroadCast Service, hereinafter referred to as 'MCBCS'). It is about.

Communication systems are being developed to provide various services such as broadcasting, multimedia video, and multimedia messages. In particular, active research is being conducted to provide users with services having high quality of service (QoS: Quality of Service (QoS)) in a next generation communication system.

The next generation communication system is to provide a variety of services by interworking wired and wireless networks, wherein the next generation communication system is a broadband wireless access (BWA) communication system, for example, IEEE ( The Institute of Electrical and Electronics Engineers (WIS) is a portable Internet system or WiMAX (Wireless Worldwide Interoperability for Microwave Access) system based on the 802.16 system.

However, among the current next-generation communication systems, the WiMAX system has not yet been determined to provide various services such as broadcasting, multimedia video, and multimedia messages provided by a service provider to users by multicasting or broadcasting. In addition, the MCBCS is provided in a static multicast service method, a dynamic multicast service service method, or a broadcast service method. In order to provide the MCBCS in the multicast service method and the broadcast service method, For example, there is a need for a specific method for establishing a data path so that a mobile station having mobility and fixedness (MS) may receive MCBCS data.

Accordingly, an object of the present invention is to provide a support system and method for providing a multicast broadcast service in a communication system.

Another object of the present invention is to support session initiation to provide a static multicast service or broadcast service in a communication system, and to register a data path for transmission of multicast broadcast service data through the session initiation. To provide a system and method for supporting the.

In accordance with an aspect of the present invention, a method for supporting a multicast broadcast service of a wireless communication system includes: a serving network gateway receiving a session start request message from a service server and providing a multicast broadcast service to a mobile station; Transmitting the session start request message to each of a plurality of base stations to forward; transmitting the session start response message to the serving network gateway in correspondence with the session start request message; Sending the session start response message to the service server to register a data path between the service server, the serving network gateway, and the base stations.

According to another aspect of the present invention, there is provided a method for supporting a multicast broadcast service of a wireless communication system, the method comprising: a mobile station initially entering an anchor network through an initial access procedure; Sending a session start request message to a serving network supporting a multicast broadcast service of the mobile station, the serving network registering a session start and data path in the serving network in response to the session start request message, and starting a session Sending a response message to the service server to register a data path with the service server.

Another method of the present invention for achieving the above object is a method for supporting a static multicast or broadcast service of a wireless communication system, the multi-cast according to a session initiate request (session initiate request) from the multicast broadcast service server Transmitting a first request message for session start, resource reservation, and data path registration to a base station in a cast broadcast service area, and initiating a session according to a response message to the first request message received from the base station; Transmitting a response message to the multicast broadcast service server, generating a Generic Routing Encapsulation (GRE) tunnel with the multicast broadcast service server, and starting a dynamic service addition procedure simultaneously with authentication of the mobile station in a network entry procedure. Sending a second request message to the base station , It includes receiving a reply message for the second request message.

A system of the present invention for achieving the above objects, in a system supporting a multicast broadcast service, a mobile station, a serving network gateway supporting the multicast broadcast service of the mobile station, the serving network gateway and a plurality of base stations A service server for providing the multicast broadcast service to the mobile station through the mobile station, wherein the serving network gateway receives the session start request message from the service server, and transmits the session start request message to the base stations, respectively. When the session start response message is received from the base stations in response to the session start request message, the session start response message is transmitted to the service server, and data exchange between the service server, the serving network gateway, and the base stations is performed. The registers.

The present invention provides a multicast broadcast service by using a procedure for notifying a session start to establish a data path in order to provide a static multicast service or a multicast broadcast service provided by a broadcast method in a communication system. Can support effectively In particular, the present invention can smoothly provide a multicast broadcast service to be provided by the mobile station in a static multicast or broadcast service manner by establishing a data path in the serving network of the WiMAX system through a session initiation procedure.

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.

The present invention is a communication system, for example, a broadband wireless access (BWA) communication system, and the BWA communication system is based on an Institute of Electrical and Electronics Engineers (IEEE) 802.16 system. A mobile Internet system, or WiMAX (Mobile Worldwide Interoperability for Microwave Access) system. The present invention proposes a system and method for supporting a multicast broadcast service (MCBCS) in a communication system (hereinafter referred to as 'MCBCS'). Here, in the embodiment of the present invention to be described later, for convenience of description, a service support system and method for providing MCBCS in an IEEE 802.16 system or a WiMAX system will be described as an example, but the service support system proposed by the present invention will be described. And the method may also be applied when other communication systems provide other various services.

In addition, in an embodiment of the present invention to be described later, the WiMAX system to provide the MCBCS to users, for example, a mobile station (MS: Mobile Station, hereinafter referred to as 'MS') having a fixed and mobile, The present invention proposes a system and a method for supporting data path registration by starting a session of the WiMAX system. That is, an embodiment of the present invention supports data path registration by initiating a session of the WiMAX system for providing MSs with the MCBCS provided by the network service provider.

In an embodiment of the present invention, the WiMAX system registers a data path by starting a session in an access system network (ASN) to provide MCBCS to the MS. A plurality of base stations (BS: hereinafter referred to as 'BS') of the ASN transmits MCBCS data to the MS to support MCBCS to the MS. That is, an embodiment of the present invention supports session initiation and data path registration of an ASN (hereinafter referred to as a 'serving ASN') for providing MCBCS to the MS in a WiMAX system.

In addition, in an embodiment of the present invention, an ASN other than an ASN (hereinafter referred to as an 'Anchor ASN') that the MS initially performs network entry (Network Entry) by performing an initial access procedure to the WiMAX system. When providing this MCBCS, it supports session initiation and data path registration in the other ASN. In other words, an embodiment of the present invention supports session initiation of the serving ASN and registration of the data path of the serving ASN when the anchor ASN corresponding to the MS receiving the MCBCS from the WiMAX system and the serving ASN are different. In this case, when the anchor ASN and the serving ASN of the MS receiving the MCBCS from the WiMAX system are different, the MS first enters the anchor ASN, and then hands over to an ASN different from the anchor ASN, that is, the serving ASN. Such as when a serving ASN provides MCBCS to the MS.

In an embodiment of the present invention, an area in which the WiMAX system provides an MCBCS, that is, a plurality of BSs, that is, RASs, may be referred to as a Media Access Control (MAC) layer. MAC or Multicast Broadcasting Service (MBS: MultiCast and BroadCast Service (MBS), hereinafter referred to as 'MBS') in the PHY Layer. Initiate the session of the serving ASN when providing the MCBCS irrespective of the presence or absence of the MS to be provided with the MCBCS in the MBS zone, that is, when providing the MCBCS in a static multicast service or broadcast serving method. And BSs that register a data path and transmit a gateway (GW) corresponding to the serving ASN (hereinafter, referred to as a 'GW') (hereinafter, referred to as a 'serving ASN GW') and MCBCS data to the MS. , And above A server providing an MCBCS to the serving ASN, i.e., providing the MCBCS through a registered data path between MCBCS servers. Next, a structure of a communication system according to an exemplary embodiment of the present invention will be described in detail with reference to FIG. 1.

1 is a diagram schematically illustrating a structure of a communication system for providing an MCBCS according to an embodiment of the present invention. 1 is a diagram schematically illustrating a structure of a WiMAX system providing an MCBCS to an MS.

Referring to FIG. 1, the communication system may perform a function of a radio access station (RAS) by transmitting an MCBCS data to an MS 102 and an MBS area in a broadcast or multicast manner. BS1 112, BS2 114, BS3 116, BS4 118 and ASN GWs that carry the MCBCS data to the BSs 112, 114, 116, 118, namely ASN GW1 120, ASN GW2 130 And an MCBCS server 140 that performs control and content providing functions for the MCBCS, and an AAA responsible for authentication, authorization, and accounting for the MS 102. Authentication Authorization Accounting) server, a policy function (PF: Policy Function, hereinafter referred to as PF) server 160 in charge of various communication protocols when providing the MCBCS, and generates and provides MCBCS content corresponding to MCBCS Includes a content provider 170.

Here, MCBCS data transmission and reception between the MS 102 and the BSs 112, 114, 116 and 118 is orthogonal frequency division multiplexing (OFDM) / orthogonal frequency division multiple access (OFDMA). Division Multiple Access, hereinafter referred to as " OFDMA " For convenience of explanation, the MS 102 performs an initial access procedure to the WiMAX system with the BS3 114 or BS4 118 to perform the WiMAX system through the BS3 114 or BS4 118. The first entry into, i.e., the ASN formed by the BS3 114, BS4 118, and ASN GW2 130 will be described as an anchor ASN of the MS 102. In addition, the MS 102 performs a handover to BS1 112 after first entering the anchor ASN, and is a serving ASN which is an ASN formed by the BS1 112, BS2 114, and ASN GW1 120. It will be described on the premise that to provide the MCBCS to the MS (102) through. Accordingly, the ASN GW2 130 is an anchor ASN GW and the ASN GW1 120 is a serving ASN GW.

The ASN GW1 120 includes a data path function (DPF) for controlling a data path of a serving ASN (hereinafter referred to as a DPF) module 1 122 and a proxy of the serving ASN. A service flow authorization (SFA) for authenticating a service flow of an MCBCS provided to the MS 102 through the serving ASN. SFA ') module 1 (126). The ASN GW2 130, like the ASN GW1 120, has a DPF module 2 132 that controls the data path of the anchor ASN, and a proxy module 2 134 that performs the proxy function of the anchor ASN. And SFA module 2 136 for authenticating the service flow of MCBCS provided to the MS 102 via the anchor ASN. Here, each of the ASN GWs 120 and 130 is included in an access control router (ACR) that performs a function of controlling the BSs 112, 114, 116, and 118.

In addition, the MCBCS server 140, the content server 142 for delivering the MCBCS content provided from the content provider 170 for generating the MCBCS content corresponding to the MCBCS to be provided to the MS 102 to the ASN, and And a controller 144 that performs a control function for providing the MCBCS content provided by the content server 142 to the MS 102.

As described above, the AAA server 150 authenticates, authorizes, and charges the MS 120 and the content provider 170 through the support of the ASN GWs 120 and 130 and the MCBCS server 140. Do this. In addition, the PF server 160 supports MCBCS corresponding to various communication protocols, for example, supports resource allocation and resource reservation corresponding to the communication protocol when MCBCS is provided. In addition, the content provider 170, the MCBCS to be provided by the MS 102, for example, MCBCS content corresponding to location-based services, video and audio services, Internet web services, voice and video services, etc. as described above, respectively Each of them is generated and delivered to the MCBCS server 140. Then, with reference to the following table to explain in detail the function of the BS (112, 114, 116, 118), RAS and ASN GWs 120, 130, that is, ACR and MCBCS server 140 for the WiMAX system to provide MCBCS do.

First, to provide the MCBCS as shown in Table 1 below, the content server 142 of the MCBCS server 140 receives MCBCS content corresponding to the MCBCS to be provided to the MS 102 from the content provider 170. MCBCS Content Server (MCBCS Content Server), which provides MCBCS, provides location based services, VoD / AoD servers providing video and audio services, web servers providing Internet web services, and voice and video services. VoIP / VT server. In addition, the content server 144 may secure MCBCS content corresponding to the MCBCS to be provided to the MS 102 at an application layer level, for example, digital rights management (DRM). It will hereinafter be referred to as 'DRM') to support security and to combine the MCBCS content received from different content providers. In addition, the content server 144 performs a function of configuring the channels and the group of MCBCS content channels for providing the MCBCS to the MS (102).

The control unit 144 of the MCBCS server 140 receives a multicast Internet Protocol (IP) address for receiving the MCBCS contents and providing an MCBCS. It allocates, supports multicast IP routing protocol and tunneling for the connection between ASN and MCBCS server 140, and supports security of MCBCS content at Layer 2 level. The controller 144 manages ASNs belonging to a multicast group, performs authentication and authorization of a user who is to be provided with the MCBCS, that is, the MS 102, and provides the MCBCS of the MCBCS that the MCBCS server 140 can provide. Supports management of sessions for advertisement and MCBCS provision, such as session information allocation, session start / stop / update, and charges for MCBCS.

As shown in Table 2, the proxy modules 124 and 134 of the ASN GWs 120 and 130 interoperate with the PF server 160 for the MCBCS and the service flow identifier (SFID) for the MCBCS. It manages Service Flow Identifier (hereinafter referred to as 'SFID'), and refers to a static multicast connection identifier (MCID) corresponding to a static multicast service method and a dynamic multicast method (MCID). And dynamic MCID. The proxy modules 124 and 134 perform a Radio Resource Management (RRM) function for MCBCS and a function of mapping an MCBCS data transmission area to an MBS area. . In addition, the proxy modules 124 and 134 support MCBCS content at the layer 2 level and allocate static and dynamic public resources. In this case, the proxy modules 124 and 134 allocate the same radio resource to all the BSs 112, 114, 116 and 118 to support macro diversity. In addition, the proxy modules 124 and 134 manage the MSs 102 to be provided with the MCBCS, that is, manage MSs belonging to the MCBCS group, and control synchronization for supporting charging and macro diversity of the MCBCS. And manage the list of the MBS area.

The DPF modules 122 and 132 of the ASN GWs 120 and 130 interoperate with the PF server 160 for the MCBCS and manage the SFID for the MCBCS, and the ASN and MCBCS server 140 and the AAA server. 150, and multicast IP routing protocols and tunneling for connections between PF servers 160. In addition, the DPF modules 122 and 132 perform MCFCS classification, MCBCS billing, and Internet Group Management Protocol (IGMP). In addition, the DPF modules 122 and 132 support the registration and release of the statically-connected MCBCS data path between the ASN GWs 120-130 and the BSs 112, 114, 116, 118 and support the dynamic-connect MCBCS. In particular, the DPF module of the anchor ASN, that is, the DPF module 2 132 among the DPF modules 122 and 132 performs a function of transmitting an IGMP report message.

In addition, the SFA modules 126 and 136 of each of the ASN GWs 120 and 130 have a quality of service (QoS) of the user, that is, the MS 102 received from the AAA server 150 when the MS 102 enters the network. of Service: (hereinafter referred to as 'QoS') determines whether to accept or reject the MCBCS request of the MS (102) in accordance with the profile (profile). In addition, although not shown, the SFA modules 126 and 136 use local policy function modules included in the SFA modules 126 and 136 to provide admission control based on the resources available when providing MCBCS. To perform. That is, when the WiMAX system provides the MCBCS through the static multicast service method, the SFA modules 126 and 136 determine the MS profile by checking the QoS profile of the MS 102 received from the AAA server 150 when the network is first entered. 102 opens the service flow to receive the MCBCS.

Further, as shown in Table 3 below, the BSs 112, 114, 116, 118, i.e., the MAC control of the RASs for MBS data transmission in the MAC layer or the PHY layer in order for the RASs to provide the MCBCS to the MS 102, Performing MBS region support and MBS RRM function, and the MAC data unit includes MBS MAP information elements (IE) in the MAC layer, MBS-MAP, MBS data IEs, and Supporting MCIDs, the PHY unit performs MBS MAP IEs and MBS MAP synchronization and MBS RRM functions in the PHY layer.

In addition, as shown in Table 4, the content server 142 of the MCBCS server 140 to provide the MCBCS as a broadcast service method of the WiMAX system, the MCBCS content channels for providing the MCBCS to the MS (102) It performs a function of configuring a group and the channels. The controller 144 allocates a multicast IP address for providing an MCBCS, supports a multicast IP routing protocol and tunneling for a connection between the ASN and the MCBCS server 140, and provides the MCBCS server 140. Manage sessions for MCBCS advertisement and MCBCS provision. Here, session management of the controller 144 is managed for each MCBCS content, not for the MS 102. Each of the ASN GWs 120 and 130, that is, the proxy modules 124 and 134 of the ACRs, has a function of SFID management for MCBCS, MCID and static air resource allocation, and mapping MCBCS data transmission area to MBS area; It controls synchronization for supporting macro diversity and manages the list of MBS regions. The DPF modules 122, 132 support the classification of MCBCS data and the registration and release of statically-connected MCBCS data paths between the ASN GWs 120, 130 and BSs 112, 114, 116, 118. The MAC controllers of the BSs 112, 114, 116, 118, that is, RASs, support the MBS region in the MAC layer, and the MAC data unit includes the MBS MAP IEs in the synchronization and MAC layer for macro diversity support, MBS-MAP, and MBS. It supports data IEs, and MCIDs, and the PHY unit supports MBS MAP IEs and MBS MAP synchronization in the PHY layer.

In addition, as shown in Table 5 below, the content server 142 of the MCBCS server 140 supports the security of the MCBCS content at the application layer level to provide MCBCS as a static multicast service method of the WiMAX system. The controller 144 performs authentication and authorization, session management, and charging for the MCBCS of the user who is to receive the MCBCS, that is, the MS 102. Each of the ASN GWs 120 and 130, that is, the proxy modules 124 and 134 of the ACRs, allocates a static MCID and a static air resource, and among the DPF modules 122 and 132, a DPF module of a serving ASN, that is, a DPF module 1. Reference numeral 122 performs an IGMP proxy function, and the DPF module of the anchor ASN, that is, the DPF module 2 132, performs a function of delivering an IGMP report message.

As shown in Table 6 below, the content server 142 of the MCBCS server 140 combines MCBCS contents received from different content providers to provide MCBCS as a dynamic multicast service method of the WiMAX system. The controller 144 manages the ASNs belonging to the multicast group and security support at the layer 2 level of the MCBCS contents. Each of the ASN GWs 120 and 130, that is, the proxy modules 124 and 134 of ACRs, supports dynamic MCID and dynamic public resource allocation and security of MCBCS content at a layer 2 level, and receives the MCBCS. Management 102, that is, the management of the MSs belonging to the MCBCS group and the RRM function for MCBCS and interworking with the PF server 160 for the MCBCS. The DPF modules 122 and 132 support the registration and release of a dynamic MCBCS data path. The BSs 112, 114, 116, 118, that is, RASs, perform security support and MBS RRM function at layer 2 level of the MCBCS content at MAC layer, and perform MBS RRM function at PHY layer.

In addition, each of the ASN GWs 120 and 130, that is, the proxy modules 124 and 134 of the ACRs, controls the connection connection and release between the MS 102 for providing the MCBCS and the anchor ASN or the serving ASN, and the MCBCS session bearer. Control the establishment, assign a resource associated with the MCBCS, such as the MCID, generate MCBCS security keys for air interface encryption, maintain a list of ASN GWs within the MCBCS billing support and MBS area. The DPF modules 122 and 132 of the ACRs support MCBCS session delivery establishment and MCBCS connection and release, support MCBCS data transfer and classification, MCBCS charging and charging for dynamically establishing and release, and MS connected to MCBCS. For connection between BSs 112, 114, 116, 118 of A102 and ASN GWs 120, 130 and a connection interface between ASN GWs 120, 130 and MCBCS server 140, AAA server 150, and PF server 160. It supports mobility management of the MS 102, and supports a multicaster router function.

The content server 142 of the MCBCS server 140 receives the MCBCS content from the content provider 170, distributes the MCBCS content to the MS 102 through the WiMAX system, and transmits the MCBCS content appropriately in the WiMAX system. Repackaging data from the content provider 170 for the purpose of encrypting the MCBCS content at the application layer level and transmitting the MCBCS content in the format required by the MCBCS session. The controller 144 of the MCBCS server 140 allocates a multicast IP address, controls the authentication of the content provider 170 and the MCBCS content transmission between the content server 142 and the content provider 170, and Authorize the MS 102 that controls the establishment and teardown of MCBCS delivery, generates and distributes encryption and security keys at the application level of MCBCS, controls and determines MCBCS session initiation and termination, and requests MCBCS. And maintain authentication and MCBCS information, maintain information of the MS 102 when the MCBCS is connected, collect billing support and the billing information for the MS 102, the content provider 170, and the ASN, and collect the MCBCS information. Correspondingly determine the ASNs that require multicast or broadcast of the MCBCS, maintain the MCBCS subscriber, namely the maintenance of the MS 102 profile and the MCBCS proxy list, and define the configuration of all MCBCS transmission areas, ie all MBS areas. To be obtained. Next, a procedure of registering a data path by starting a session of a serving ASN to provide an MCBCS in a communication system according to an embodiment of the present invention will be described with reference to FIG. 2.

2 is a diagram illustrating a procedure of transmitting and receiving a signal for registering a data path by starting a session in a serving ASN in a communication system according to an embodiment of the present invention. 2, in the WiMAX system providing MCBCS to the MS as described above, the anchor ASN and the serving ASN of the MS are different to start a session of the serving ASN to provide MCBCS to the MS through data path registration. Is a diagram illustrating a procedure for transmitting and receiving a signal. That is, FIG. 2 illustrates a method for session start and data path registration of the different ASN when the MS performs an initial access procedure with the WiMAX system and then receives an MCBCS through an ASN different from the anchor ASN after initially entering the anchor ASN. A diagram illustrating a signal transmission and reception procedure. Here, since the MS first enters the anchor ASN by performing the initial access procedure with the WiMAX system is not directly related to the present invention, a detailed description thereof will be omitted herein.

Referring to FIG. 2, when the MCBCS server 140 has MCBCS content corresponding to the MCBCS to be provided to the MS 102 through the serving ASN, the MCBCS server 140 multiplies the multicast contents for a session initiate request. A session start request (Session_Start-REQ: Session Start-Request, hereinafter referred to as 'Session_Start-REQ') message including a cast IP address and QoS information corresponding to the MCBCS content is sent to the serving ASN. It transmits to the included ASN GW1 (120) (S202).

Then, the ASN GW1 120 receiving the Session_Start-REQ message allocates an SFID, and is referred to as a Session_Start-REQ message and a Resource Reservation Request (RR-REQ). Message) or BS (112) that is all BSs present in the same MBS area where the same MCBCS is provided, namely BS1 (112) Data Path Registration Request (DP_REG-REQ). And BS2 114 (steps S204 and S206). Here, the BSs 112 and 114 transmit the same MCBCS data, respectively, and the RR-REQ message and the DP_REG-REQ message may be piggybacked and transmitted. At this time, a Generic Routing Encapsulation (GRE) tunnel is generated for each service flow of the BSs 112 and 114, and the GRE tunnel is generated to transmit the same MCBCS data to all MSs existing in the MBS region rather than a specific MS.

Here, the Session_Start-REQ message transmitted by the ASN GW1 120 includes an MCID, radio resource parameters between the BSs 112 and 114 and the MS 102, and the BS when providing the MCBCS to the MS 102. MAP information of the MCBCS frame between the 112 and 114 and the MS 102 is included. In other words, when the BSs 112 and 114 provide the MCBCS to the MS 102, MCBCS of the MAC or PHY layer, that is, MAP information of a frame in which MBS data is transmitted and received, for example, an MBS Burst Frame Offset, OFDMA Symbol Offset, Subchannel Offset, OFDMA Symbols, No. Subchannles, Repetition Coding Indication, Next MBS Frame Offset ( Next MBS frame offset, Next MBS OFDMA Symbol offset, and the like. The proxy module 1 124 of the ASN GW1 120 dynamically generates resource parameters for the MCID and MCBCS when receiving the MCBCS data information to be transmitted from the MCBCS server 140 to the serving ASN. However, unlike this, resource parameters for the MCID and MCBCS may be generated by an element management system (EMS: hereinafter referred to as 'EMS') for the WiMAX system and transmitted to the ASN GW1 129. have. In the following, the generation and transmission of the MCID and resource parameters are not directly related to the present invention, and thus a detailed description thereof will be omitted.

In addition, the RR-REQ message transmitted by the ASN GW1 120 includes an SFID and a multicast IP address, that is, an MCID and QoS related parameters for all BSs in the MBS region, that is, BS1 112 and BS2 114. Included. The DP_REG-REQ includes data tunnel related information and QoS information.

Then, BSs 112 and 114 that have received the Session_Start-REQ message / RR-REQ message / DP_REG-REQ message respectively perform resource reservation / data path registration according to each message, and then start a session start response (Session_Start). -RSP: Session Start Response, hereinafter referred to as 'Session_Start-RSP' message and Resource Reservation Response (RR-RSP: hereinafter referred to as 'RR-RSP') Message / Data Path Registration Response ( DP_REG-RSP: Data Path Registration Response (hereinafter referred to as DP_REG-RSP) messages are respectively transmitted to the ASN GW1 120 (steps S208 and S210).

Next, the ASN GW1 120 receiving the Session_Start-RSP message / RR-RSP message / DP_REG-RSP message from the BSs 112 and 114 respectively transmits a Session_Start-RSP message to the MCBCS server 140 (S212). step).

Then, the ASN GW1 120 creates a tunnel (R3) between the MCBCS server 140 for receiving MCBCS content from the MCBCS server 140 (Create Tunnel) (step S214). In this case, the ASN GW1 120 does not create a connection tunnel with the MCBCS server 140 but establishes a link for transmitting MCBCS data with the MCBCS server 140 through a multicast routing protocol defined by an IETF (Intrenet Engineering Task Force). You can also create Then, the session start procedure between the ASN GW1 120 and the BSs 112 and 114, that is, the serving ASN and the MCBCS server 160 and the MS 102 is completed, and the data path is registered. Announce) may be performed and service selection may be additionally performed (step S216).

Thus, in the communication system according to the embodiment of the present invention, the Session_Start-REQ / between the MCBCS server 140 and the ASN GW1 120 of the serving ASN, and the BSs 112 and 114 to provide the MCBCS to the MS 102. A session start and a data path of a serving ASN are registered and supported to provide an MCBCS to the MS 102 by transmitting and receiving an RSP message, an RR-REQ / RSP message, and a DP_REG-REQ.RSP message and creating a tunnel. Then, with reference to FIG. 3, the MS starts the MCBCS subscription procedure after registering the session start and data path of the serving ASN to provide the MCBCS in the communication system according to the embodiment of the present invention. Let's do it. Here, FIG. 3 is a diagram for explaining an MS to join a MCBCS through a network service provider, that is, an ASN. As described above, when the WiMAX system provides the MCBCS through a broadcast service method, the WiMAX system enters a network when the MS enters the network. A procedure of activating a service flow for providing an MCBCS in a network is initiated without the MS requesting to provide an MCBCS. That is, MCBCS is activated at network entry after the MS successfully authenticates the access, and the service flow of MCBCS is not deactivated even if the MS does not want to provide MCBCS.

3 is a diagram illustrating a signal transmission and reception procedure for subscribing to an MCBCS of an MS in a communication system according to an exemplary embodiment of the present invention. 3 is a diagram illustrating a procedure in which the MS joins an MCBCS in a WiMAX system that provides an MCBCS.

Referring to FIG. 3, when the data path is registered by starting a session of the serving ASN as described above with reference to FIG. 2, the MS 102 enters the network into the AAA server 150 by the initial network entry into the anchor ASN. Entry (step S302) and access authentication of the MS 102 through the AAA server 150 is performed (step S304). Then, the SFA module 2 136 of the anchor ASN of the MS 102 sends a route registration request including service flow information of the MCBCS and route information of MCBCS data to be provided to the MS 102. Path_REG-REQ: Path Registration Request (hereinafter referred to as "Path_REG-REQ") message is transmitted to BS1 112 of the MS 102 (step S306). Here, for convenience of description, it will be assumed that BS1 112 of the BS1 112 and BS2 114 is the serving BS of the MS 102.

Upon receiving the Path_REG-REQ message, BS1 112 performs a Dynamic Service Addition (DSA) operation with MS 102. In other words, BS1 112 performs the above operation. Send a Dynamic Service Addition Request (DSA-REQ) message to the MS 102 (hereinafter, referred to as 'DSA-REQ') (step S308), and the MS 102 sends the DSA-REQ message. In response to the DSA-RSP, a Dynamic Service Addition Response (DSA-RSP) message is transmitted to the BS1 112 (step S310). Here, the DSA operation between the BS1 112 and the MS 102 may be repeatedly performed one or more times when there is more than one MCBCS data to be provided. In the DSA-REQ message, the identifiers and SFIDs of the MCID and the MBS region are included in the DSA-REQ message. Included.

Then, BS1 112 is referred to as a path registration response (Path_REG-RSP: Path_REG-RSP), which includes service flow information of MCBCS and path information of MCBCS data corresponding to DSA operation. ) Transmits a message to the SFA module 2 (136) (step S312). Then, the SFA module 2 136 sends a path registration acknowledment (Path_REG-ACK) message to the BS1 112 in response to the Path_REG-RSP message. Transmit (step S314). Accordingly, the subscription and service flow generation of the MS 102 to receive the MCBCS through the serving ASN in which the data path is registered is completed.

Meanwhile, in the detailed description of the present invention, specific embodiments have been described, but various modifications are possible without departing from the scope of the present invention. Therefore, the scope of the present invention should not be limited to the described embodiments, but should be defined not only by the scope of the following claims, but also by the equivalents of the claims.

1 is a diagram schematically showing the structure of a communication system for providing MCBCS according to an embodiment of the present invention.

2 is a diagram illustrating a procedure of transmitting and receiving a signal for registering a data path by starting a session of a serving ASN in a communication system according to an embodiment of the present invention.

3 is a diagram illustrating a signal transmission and reception procedure for subscribing to an MCBCS of an MS in a communication system of the present invention.

Claims (21)

In a wireless communication system, a method for supporting a multicast broadcast service, Receiving, by a serving network gateway, a session start request message from a service server, respectively transmitting the session start request message to a plurality of base stations which deliver a multicast broadcast service to a mobile station; Transmitting, by the base stations, a session start response message to the serving network gateway in response to the session start request message; And the serving network gateway sending the session start response message to the service server to register a data path between the service server, the serving network gateway and the base stations. The method of claim 1, If there is a multicast broadcast service to be provided to the mobile station, the service server allocates a multicast internet protocol address corresponding to the multicast broadcast service, and includes session information and service quality information corresponding to the multicast broadcast service. And transmitting the session start request message to the serving network gateway. The method of claim 2, The transmitting of the session start request message to the base stations may include: a resource reservation request message including a multicast internet protocol address and a multicast connection identifier corresponding to the base stations, quality information of the multicast broadcast service; And transmitting each data path registration request message including data tunnel information to the base stations. The method of claim 3, The step of transmitting the session start response message to the serving network gateway may include transmitting a resource reservation response message and a data path registration response message corresponding to the resource reservation request message and the data path registration request message, respectively. The service support method characterized by. The method according to any one of claims 1 to 4, The registering of the data path may include creating a tunnel between the serving network gateway and the service server. The method of claim 5, The registering of the data path may include creating a link using a multicast routing protocol defined by an Intrenet Engineering Task Force (IETF) between the serving network gateway and the service server. The method according to any one of claims 1 to 4, Receiving a session start request message from the service server, the session start request including the session information between the service server, the serving network gateway and the base stations and the service quality information of the multicast broadcast service to be provided to the mobile station. Service support method, characterized in that receiving a message. The method according to any one of claims 1 to 4, The session start request message includes a multicast connection identifier and a service flow identifier corresponding to the mobile station, resource parameters between the base stations and the mobile stations provided to the mobile stations, and a multicast broadcast service of the base stations and the mobile station. Service support method comprising the MAP information of the frame for transmitting the. The method of claim 1, After registering the data path, the base stations receiving a path registration request message from the anchor network gateway of the mobile station and performing dynamic service addition with the mobile station to generate a service flow. . In a wireless communication system, a method for supporting a multicast broadcast service, The mobile station initially entering the anchor network through an initial access procedure; Sending, by a service server, a session start request message to a serving network supporting the multicast broadcast service of the mobile station; Registering, by the serving network, a session start and data path in the serving network corresponding to the session start request message, and sending a session start response message to the service server to register a data path with the service server. How to service. The method of claim 10, The registering of the data path with the service server may include creating a tunnel between the serving network and the service server. The method of claim 10, The registering of the data path with the service server may include creating a multicast routing tree connection between the serving network gateway and the service server. In a system supporting a multicast broadcast service, With mobile station, A serving network gateway supporting the multicast broadcasting service of the mobile station; A service server for providing the multicast broadcast service to the mobile station through the serving network gateway and a plurality of base stations, When the serving network gateway receives a session start request message from the service server, the serving network gateway transmits the session start request message to the base stations, and receives a session start response message corresponding to the session start request message from the base stations. And registering the data path between the service server, the serving network gateway, and the base stations by transmitting the session start response message to the service server. The method of claim 13, If there is a multicast broadcast service to be provided to the mobile station, the service server allocates a multicast internet protocol address corresponding to a multicast broadcast service, and includes session information and service quality information corresponding to the multicast broadcast service. And send the session start request message to the serving network gateway. The method of claim 14, The serving network gateway may include a resource reservation request message including a multicast internet protocol address and a multicast connection identifier corresponding to the base stations, and a data path registration request including quality information and data tunnel information of the multicast broadcast service. And a message to each of the base stations. The method of claim 15, And the serving network gateway receives a resource reservation response message and a data path registration response message from the base stations corresponding to the resource reservation request message and the data path registration request message, respectively. The method according to any one of claims 13 to 16, The serving network gateway is configured to create a tunnel with the service server or create a link using a multicast routing protocol defined by an Intrenet Engineering Task Force (IETF). The method according to any one of claims 13 to 16, The serving network gateway is configured to receive from the service server the session start request message including session information between the service server, the serving network gateway and the base stations, and quality of service information of a multicast broadcast service to be provided to the mobile station. Service support system, characterized in that. The method according to any one of claims 13 to 16, The serving network gateway provides a multicast connection identifier and a service flow identifier corresponding to the mobile station, resource parameters between the base stations and the mobile stations provided to the mobile stations, and a multicast broadcast service of the base stations and the mobile station. And transmitting the session start request message including MAP information of a frame to be transmitted to the base stations, respectively. The method of claim 13, After registering the data path with the serving network gateway, the base stations receive a route registration request message from the anchor network gateway of the mobile station and perform dynamic service addition with the mobile station to generate the serving network gateway and the service flow. Service support system. In a wireless communication system, a method for supporting a static multicast or broadcast service, Transmitting a first request message for session start, resource reservation, and data path registration to a base station in a multicast broadcast service area according to a session initiate request from a multicast broadcast service server; Transmitting a session start response message to the multicast broadcast service server according to a response message to the first request message received from the base station; Transmitting a second request message to the base station for initiating a dynamic service addition procedure simultaneously with the authentication of the mobile station in a network entry procedure; And receiving a response message to the second request message.

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