KR20090120260A - Apparatus and method for dynamic multicast transmission in broadband wireless communication system - Google Patents

Abstract

PURPOSE: An apparatus and a method for dynamic multicast transmission in a broadband wireless communication system are provided to efficiently use radio resources by turning on a broadcast service when a broadcast service consumer exists for a certain broadcasting channel and by turning off the broadcast service otherwise. CONSTITUTION: A first interface unit(702) communicates with a broadcasting server through an R3 interface, and a second interface unit(704) communicates with a base station through an R6 interface. A database manages a user group joined to broadcasting channels. When IGMP join message is received from a terminal, a controller(700) transmits the message, which requests the service authentication for the terminal, to the broadcasting server.

Description

Apparatus and method for dynamic multicast transmission in broadband wireless communication system {APPARATUS AND METHOD FOR DYNAMIC MULTICAST TRANSMISSION IN BROADBAND WIRELESS COMMUNICATION SYSTEM}

The present invention relates to an apparatus and method for providing a multicast and broadcast service (MBS), and more particularly, to an apparatus and method for supporting dynamic multicast transmission.

In general, communication systems have been developed mainly for voice services, and are gradually developing into communication systems capable of not only voice but also data services and various multimedia services. However, the voice-oriented communication system has not satisfied the rapidly increasing user's service needs due to the relatively small transmission bandwidth and high usage fee. In addition, due to the development of the communication industry and increasing user demand for Internet services, there is an increasing need for a communication system capable of efficiently providing Internet services. As a result, an OFDM-based broadband wireless access system has been introduced to efficiently provide Internet services with broadband enough to meet the demand of users.

The main services of the broadband wireless access system include the Internet, Voice over IP (VoIP), and non-real time streaming services. In addition, recently, a multicast broadcast service (MBS), which is a real-time broadcasting service, is emerging as a new service. The broadcast service is a multicast broadcast service (MBS) or a multicast broadcast service (MCBCS) for a WiMAX or a multi media broadcast and multicast service (MBMS) for a WCDMA according to a standard group or applied system. CDMA may be called BCMCS (Broadcast / Multicast Service), and may also be called DMB or MediaFLO.

The MBS may provide video services such as news, drama, sports relay, data services such as radio music broadcasting, and real-time traffic information. In addition, the MBS can simultaneously transmit various channels such as high-definition video and high-quality audio due to the high data rate using the macro diversity technique. Here, the macro diversity scheme means transmitting the same data at the same resource and at the same time for each MBS zone.

On the other hand, the global trend is to allow a plurality of network service providers (NSPs) to provide a desired broadcast service for a single network access provider (NAP).

In general, a broadcast service of a wireless network may be classified into a broadcast service and a multicast service according to whether a user group is managed. Here, the broadcast service may cause a waste of resources by always providing a broadcast service regardless of the presence or absence of a user. Accordingly, there is a need for a method of flexibly operating a broadcast service according to whether a user wants a broadcast service.

Accordingly, an object of the present invention is to provide an apparatus and method for providing a broadcast service through a wireless network.

Another object of the present invention is to provide an apparatus and method for minimizing resource waste caused by a broadcast service.

Another object of the present invention is to provide an apparatus and method for flexibly operating a broadcast service according to whether a user wants a broadcast service.

Still another object of the present invention is an apparatus for turning on a broadcast service when a broadcast service consumer exists for a specific MBS zone or a specific broadcast channel and turning off the broadcast service when there is no broadcast service receiver. And providing a method.

According to an aspect of the present invention for achieving the above object, a method for providing a broadcast service in a wireless communication system, the terminal, the process for transmitting an IGMP join message for joining the desired broadcast channels to the broadcast server and The process of performing the service authentication for the terminal by the broadcast server in conjunction with the authentication server, and if the service authentication is successful, the broadcast server, MBS zone or broadcast channel for providing a broadcast service to the terminal Transmitting a broadcast on notification message for activating the message to a corresponding network entity (NE) of an access service network (ASN); and the NE of the ASN responds to the broadcast on notification message. Starting a broadcast service for an MBS zone or a broadcast channel; and all the terminals for the activated MBS zone or a broadcast channel A process of checking whether it is leaved, and when all the terminals are leaved, the broadcast server sends a broadcast off notification message for deactivating the corresponding MBS zone or broadcast channel to the NE of the ASN. And transmitting, by the NE of the ASN, stopping the broadcast service for the corresponding MBS zone or broadcast channel in response to the broadcast off message.

According to another aspect of the present invention, in a method for providing a broadcast service in a wireless communication system, the terminal transmits an IGMP join message for joining desired broadcast channels to the corresponding NE of the ASN, and NE, a process for transmitting a message requesting service authentication for the terminal to the broadcast server, the broadcast server performs a service authentication for the terminal in conjunction with the authentication server, the response message containing the service authentication result Transmitting to the NE of the ASN and, if service authentication is successful for the terminal, the NE of the ASN broadcasts an indication of activation of an MBS zone or broadcast channel for providing a broadcast service to the terminal. on) transmitting a notification message to the broadcast server, and the NE of the ASN initiates a broadcast service for the MBS zone or broadcast channel. And checking, by the NE of the ASN, whether all terminals are leaved with respect to the currently activated MBS zone or broadcast channel, and if all terminals are leaved, It characterized in that it comprises a process of stopping the broadcast service.

As described above, since the present invention turns on the broadcast service when there is a broadcast service consumer for a specific MBS zone or a specific broadcast channel, and turns off the broadcast service when there is no broadcast service consumer, There is an advantage that can efficiently use the air resource (air resource).

Hereinafter, the operating principle of the present invention will be described in detail with reference to the accompanying drawings. In the following description of the present invention, detailed descriptions of well-known functions or configurations will be omitted if it is determined that the detailed description of the present invention may unnecessarily obscure the subject matter of the present invention. Terms to be described later are terms defined in consideration of functions in the present invention, and may be changed according to intentions or customs of users or operators. Therefore, the definition should be made based on the contents throughout the specification.

Hereinafter, the present invention will propose a method for flexibly operating a broadcast service according to whether a user wants a broadcast service.

In this case, the broadcast service is a multicast broadband service (MCBCS), a multicast and broadcast service (MBS), a multi media broadcast and multicast service (MBMS), a broadcast / multicast service (MBMCS), a DMB, a MediaFLO according to a standard group and an operator's intention. And so on.

In the following description, a name of a network entity (NE) is defined according to a corresponding function, and may be changed according to the intention of the standardization group and the operator. For example, the base station may be called an access point (AP), a radio access station (RAS), a node-B, or a base station (BS). In addition, the base station controller may be referred to as a radio network controller (RNC), a base station controller (BSC), an access control router (ACR), or an access service network gateway (ASN-GW). Here, the ASN-GW may perform a router function as well as a base station controller function.

In addition, the following wireless network describes an OFDM / OFDMA-based broadband wireless access system by way of example, but the network structure according to the present invention can be easily applied to other wireless systems.

Matters that should be considered to practice the invention are as follows.

First, in the case of a broadcast service provided regardless of the presence or absence of a broadcast service consumer, the terminal should be able to receive a broadcast in idle or dome state. In addition, the user should be able to change the broadcast channel without a separate interworking procedure with the network.

Second, the base station broadcasts the broadcast zone identifier and the broadcast channel MAC layer identifier, and the terminal should be able to read and use this information. That is, the MAC layer of the terminal should be able to obtain the broadcast zone identifier and the broadcast channel MAC layer identifier without a separate interworking procedure with the network.

Third, the signaling overhead including the IGMP (Internet group management protocol) interworking procedure should be designed not to be larger than the resource saving size due to dynamic multicast transmission. That is, the advantages of multi-BS (with macro diversity) should not be reduced.

Fourth, the network access provider (NAP) must manage broadcast channel requirements of different network service providers (NSPs) in a integrated manner so that no waste of radio resources occurs.

The present invention is to efficiently perform a dynamic multicast transmission in view of the above. In this case, the dynamic multicast transmission indicates turning on / off the broadcast service according to the broadcast service consumer.

1 illustrates a network structure according to an embodiment of the present invention.

As shown, the service provider (SP) includes a server 10, MCBCS server 20, ASN_GW 30 and the base station 40 is configured. Here, the ASN_GW 30 may be classified into an MCBCS proxy that processes signaling and an MCBCS DPF that processes bearer traffic, and the MCBCS server 20 also processes a signaling C-plane and bearer. It can be divided into U-planes that handle traffic. Meanwhile, the ASN_GW 30 and the base station 40 may be classified into an access service network (ASN).

Referring to FIG. 1, the service provider server 10 creates and stores broadcast content, and registers content with the MCBCS server 20 using an application layer protocol (eg, HTTP) before the broadcast service.

The MCBCS server 20 has an interface with an external service provider server 10 and an AAA server (not shown), and a service guide (broadcast schedule, mapping table, etc.) and a service authority key for each content are transmitted to the terminal. To pass. At this time, the MCBCS server 20 and the terminal may communicate using an application layer protocol (eg, HTTP). When a content registration request is received from the service provider server 10 through an application layer protocol (eg, HTTP), the MCBCS server 20 allocates a multicast IP address and a content ID for each content, and each content. Each time, the MBS Zone ID and the MCID (Multicast CID) are mapped. That is, the MCBCS server 20 has a content ID, a multicast IP address, a service time (delivery date, delivery time), data rate, MCID, MBS zone ID, and transmission zone ID for each content. Etc. are held in the mapping table. This mapping table is used to convey various signaling and bearer traffic to ASN_GW.

The ASN_GW 30 transmits traffic from the core network to the base station 40, and transmits traffic from the base station 40 to the core network. The ASN_GW 30 manages a service flow (SF), a connection, and mobility for each terminal. Here, a unique service flow (SF) is generated for each uplink and downlink connection. It also has an interface with a CSN, such as an AAA server and a broadcast server (MCBCS server). The MBS controller is configured in an access service network (eg, a block in ASN_GW), performs a data / time synchronization function for broadcast traffic from the MCBCS server 20, and performs the data. / Cast the time-synchronized broadcast packet to base stations in the same MBS zone.

The base station 40 has a wireless interface with the terminal and transmits broadcast content from the MBS controller in the ASN_GW 30 through a predetermined resource at a predetermined time. Here, when supporting multi-BS MBS for a broadcast service, base stations belonging to the same MBS zone broadcast the same content through the same resource at the same time.

A network manager (not shown) is responsible for maintenance and maintenance of network entities of the ASN, and delivers PLDs (Program Lading Data) required for initialization of the ASN_GW 30 and the base station 40 to the corresponding network entities. Although not shown, there may also be a network manager (MCBCS OMC) for managing the MCBCS server 20. The network manager may be called an EMS server, a WMS server or an OMC. NAP preconfigures the relationship between MBS zone ID and BSID (Base Station IDentifier) through EMS server, and air scheduling of MCID and MBS region according to business contract with NSPs. Scheduling is configured in advance. That is, the network manager delivers the configuration table to the NE according to the type of NE (MCBCS server, ASN_GW, BS).

A terminal (not shown) is a subject consuming a broadcast service. The terminal receives and stores a service guide (including a mapping table) from the MCBCS server 20 through an application layer in order to receive, change, and delete broadcast traffic even in an idle mode. The MCBCS server 20 authenticates the subscriber when a subscription request is received from the terminal, and downloads the service guide to the corresponding terminal when authentication is successful. In this case, the service guide may include a broadcast schedule (content ID, time, transmission rate, etc.), a multicast IP address, an MCID, an MBS zone ID, an encryption key, a life time of the encryption key, and the like. have. The terminal may identify the MBS zone to which it currently belongs through a broadcast message (eg, DCD) including a system parameter.

Although not shown, a policy server, an AAA (Authentication, Authorization, Accounting) server, etc. may exist in the core service network.

The AAA server may manage authentication and billing information, and may include a subscription profile repository (SPR) function for managing profile information for each subscriber. In addition, the AAA server may manage the subscriber's broadcast service authorization information and the encryption key derived from the initial authentication and the life time (life time). A policy server provides policy information (eg QoS policy information) determined by an operator (or operator) to a corresponding network entity. Here, the policy server may exist in the AAA server, may exist in another network entity, or may exist as a separate server.

Meanwhile, it is assumed that encryption and life time of application layer content are uniquely set by broadcasting zone (MBS zone ID), broadcasting station, or broadcasting channel (MCID), not by content. In the case of upper layer signaling, all such encryption schemes can be accommodated.

2 illustrates a procedure for a broadcast service in a wireless communication system according to an embodiment of the present invention.

Referring to FIG. 2, first, the terminal requests a service guide, which is freely distributed to a broadcasting server (MCBCS server) of a core service network (CSN) through an application layer (eg, HTTP) in step 201, and the service in step 203. Receive a response message containing a guide. In this case, the service guide includes broadcast schedule information (including content ID) for each NSP. For example, the terminal user may access the web and download broadcast schedule information through the application layer. The service guide may include a multicast IP address in addition to the content ID for each broadcast channel.

In step 205, the terminal transmits a subscription request message for subscribing to a broadcast service to the broadcast server. In step 207, the broadcast server authenticates the service subscription of the terminal in association with an authentication server (AAA server). In this case, if authentication is successful, the broadcast server transmits a response message to the subscription request to the terminal in step 209. That is, the terminal requests the broadcast server for essential information for receiving desired broadcast channels. Then, the broadcast server authenticates the user by interworking with an authentication server (for example, AAA server), and if the authentication is successful, each of the broadcast channels desired by the user (content ID, multicast IP address, MCID), MBS zone. The mapping table including the ID, encryption key, and life time is delivered to the terminal through the application layer. The mapping table may be delivered to the terminal through a subscription procedure or to the terminal through the service guide acquisition procedure.

In this case, since the encryption key is generally updated periodically according to the valid time, the terminal may periodically update the encryption key after using the separate signaling procedure or the subscription procedure. have. In this case, when the renewal procedure is performed using the subscription procedure, an identifier indicating what information this subscription procedure is to update should be defined. For example, through the subscription procedure, the MCID can be updated, the MCID can be updated, the encryption key can be updated, and two or more can be updated at the same time.

Meanwhile, the subscription procedure may be performed in a pull mode or a push mode according to a signaling method. In this case, the pull mode means that the terminal transmits a request message to the broadcast server, and the broadcast server responds with a response message. It shows a method of delivering necessary information to the terminal.

Here, the pull mode may be operated by chance than the push mode. For example, the client program (application layer) of the terminal obtains from the MAC layer the MBS zone ID of the serving subcell to which the terminal is currently connected and the MBS zone ID list for neighboring base stations. The desired MBS zone ID can be sent to the broadcast server by putting it in the request message. That is, the terminal can obtain MCIDs and encryption keys for the desired MBS zone. As another example, when including the (MBS zone ID, MCID) in the request message, it is possible to obtain the encryption key and the valid time for the desired broadcast channel. That is, in this way, when using the full mode, the subscription procedure can be flexibly operated.

The procedure of obtaining the above-described service guide (steps 201 and 203) and the subscription procedure (steps 205 to 209) may be performed as one signaling procedure instead of a separate procedure. In addition, the MBS zone ID, MCID, multicast IP address is preferably delivered to the terminal in the joining process, but can be delivered to the terminal by including the above information in the service guide for free without authentication. In this case, the terminal may obtain the encryption key and the valid time for the desired broadcast channel through a subscription procedure.

As described above, the terminal obtains a mapping table (eg, content ID: multicast IP address: MCID) for broadcast reception through a service guide acquisition procedure and a subscription procedure.

In step 211, the terminal performs an operation for receiving a broadcast channel selected by the user. When the user selects a specific broadcast channel, the application layer of the terminal obtains the MCID corresponding to the broadcast channel through the mapping table, and delivers the MCID to the MAC layer to instruct the reception of the broadcast channel. To this end, the terminal should have a cross-layer interface. The cross-layer interface implemented in the terminal includes "an interface between the client program and the IP layer, and an interface between the client program and the MAC layer. In this case, in the case of the interface between the client program (application layer) and the MAC layer, the MBS zone ID and the MCID In addition, in case of the uplink, the application layer acquires the MBS zone ID from the MAC layer, and the obtained MBS zone ID acquires the MCID, encryption key, and valid time for the corresponding MBS zone. It can be used to

In step 213, the terminal receives the content of the corresponding broadcast channel using the MCID for the desired broadcast channel. That is, the MAC / PHY layer of the terminal decodes broadcast traffic (burst) corresponding to the MCID received from the application layer, and the decoded data is reproduced in the application layer after the IP layer processing.

As such, when an application layer acquires and manages a mapping table, the terminal may receive, change, and delete a broadcast channel without interworking with a network. In particular, the terminal may receive a broadcast channel without network interworking even in an idle or dormant state.

In the aforementioned FIG. 2, the subscription procedure may be performed by combining IGMP join and application layer signaling of the terminal. This will be described in detail later with reference to FIG. 3.

Under the procedure of FIG. 2 described above, a method of implementing dynamic multicast transmission is as follows. The dynamic multicast transmission refers to turning on / off a broadcast service according to the presence or absence of a user who wants a broadcast service.

3 illustrates a broadcast service procedure supporting dynamic multicast transmission in a wireless communication system according to an embodiment of the present invention.

Referring to FIG. 3, in step 301, the terminal requests a service guide distributed free to a broadcast server of a core service network, and obtains the service guide from the broadcast server. In this case, the service guide includes broadcast schedule information for each NSP. That is, the service guide may include a content ID, a multicast IP address, and broadcast time information for each broadcast channel.

Thereafter, in step 303, the terminal receives selection of broadcast channels for which a user wants to subscribe to a service. When the broadcast channels to be subscribed to are selected, the terminal transmits an IGMP join message for subscribing to the selected broadcast channels in step 305 to the broadcast server. In this case, the IGMP join message includes multicast IP addresses for the selected broadcast channels.

In step 307, the broadcast server authenticates the service subscription of the terminal in association with an authentication server (AAA server). In this case, if authentication is successful, the broadcast server responds to a broadcast on notification message for activating an MBS zone (or broadcast channel) for providing a broadcast service to the terminal in step 309. Forward to NE (eg ASN_GW with MCBCS DPF). Then, the corresponding NE of the ASN activates a broadcast service for the MBS zone (or broadcast channel) in response to the broadcast on notification message in step 311, and acknowledges an acknowledgment message for the broadcast on message. Send to broadcast server.

If the MBS zone (or broadcast channel) for providing a broadcast service to the terminal is already activated, the broadcast on notification message transmitted from the broadcast server to the ASN may be omitted. In addition, once a specific MBS zone (or broadcast channel) is activated, the broadcast server may broadcast a message (eg, IP layer message) indicating that the MBS zone (or broadcast channel) is activated to all terminals. In this case, unnecessary signaling for joining a broadcast channel in which the terminal is already activated can be eliminated.

On the other hand, in step 313, the broadcast server provides (content ID, multicast IP address, MCID), MBS zone ID, encryption key and life time for each broadcast channel desired by the terminal. The mapping table is transmitted to the terminal through the application layer. In step 315, the terminal stores the mapping table and transmits a subscription acknowledgement message to the broadcast server. In this way, the joining procedure may be performed by combining IGMP join and application layer signaling. In another embodiment, as described in FIG. 2, the subscription procedure may exist as a separate signaling procedure.

As described above, the terminal obtains a mapping table (eg, content ID: multicast IP address: MCID) for broadcast reception.

In step 317, the terminal receives the broadcast channel selected by the user. That is, when the user selects a broadcast channel, the application layer of the terminal delivers the MCID corresponding to the corresponding broadcast channel to the MAC layer, and the MAC / PHY layer decodes the traffic corresponding to the MCID to the upper layer. To this end, the terminal must have a cross-layer interface as described above.

Thereafter, when the user leaves the broadcast service subscription, the terminal transmits an IGMP leave message for releasing the corresponding broadcast channels to the broadcast server in step 319. Here, the IGMP live message may include a multicast IP address of at least one broadcast channel that the user wants to unsubscribe from. In addition, the IGMP live message may be a message generated by the terminal itself, or may be a message in response to a periodic query of the broadcast server.

When the IGMP live message is received from the mobile station, the broadcast server determines whether all mobile devices are left in the corresponding MBS zone (or broadcast channel) in step 321. If no broadcast service subscriber exists for the corresponding MBS zone (or broadcast channel), the broadcast server broadcasts a broadcast off notification message to deactivate the MBS zone (or broadcast channel) in step 323. To the corresponding NE of the ASN (eg, ASN_GW with MCBCS DPF). Then, in step 325, the corresponding NE of the ASN deactivates a broadcast service for the corresponding MBS zone (or broadcast channel) in response to the broadcast off message, and transmits a response message to the broadcast server.

As described above, FIG. 3 illustrates a case where a user group is managed in a CSN, and an IGMP interworking procedure occurs between a terminal and an NE (broadcast server) of the CSN. Here, the broadcast on / off for the MBS zone (or broadcast channel) may utilize the R3 signaling interface.

Hereinafter, a case in which the user group is managed by the ASN will be described.

4 illustrates a broadcast service procedure for supporting dynamic multicast transmission in a wireless communication system according to an embodiment of the present invention.

Referring to FIG. 4, first, the terminal requests a service guide, which is distributed free of charge, in step 401 to the broadcast server, and receives the service guide from the broadcast server in step 403. In this case, the service guide includes broadcast schedule information for each NSP. That is, the service guide may include a content ID, a multicast IP address, and broadcast time information for each broadcast channel.

Thereafter, in step 403, the terminal receives a selection of broadcast channels for which a user wants to subscribe to a service. When the broadcast channels to be subscribed to are selected, the terminal transmits an IGMP join message for subscribing to the selected broadcast channels in step 405 to the corresponding NE of the ASN (eg, ASN_GW with MCBCS PDF). In this case, the IGMP join message includes multicast IP addresses for the selected broadcast channels.

Then, in step 407, the NE of the ASN transmits the multicast IP addresses for the desired broadcast channels and the MBS zone ID to which the terminal belongs to the broadcast server and requests authentication. In step 409, the broadcast server authenticates the service subscription of the terminal by interworking with an authentication server (AAA server).

In this case, if authentication is successful, the broadcast server transmits an authentication response message indicating authentication success to the NE of the ASN in step 411. Then, the NE of the ASN activates an MBS zone (or broadcast channel) for providing a broadcast service to the terminal in step 413, and broadcast on notification message indicating activation of the corresponding MBS zone (or broadcast channel). Send to the broadcast server. In step 414, the broadcast server transmits a Notify Acknowledgment message to the NE of the ASN. In this case, the signaling of steps 413 and 414 can be omitted. For example, if the MBS zone (or broadcast channel) is already activated, the broadcast on notification message can be omitted.

On the other hand, if authentication is successful for the terminal, the broadcast server (content ID vs. multicast IP address vs. MCID), MBS zone ID, encryption key and valid time for each of the broadcast channels desired by the terminal in step 415. The mapping table including the data is transmitted to the terminal through the application layer. In step 417, the terminal stores the mapping table and transmits a subscription acknowledgment message to the broadcast server. As such, the joining procedure may be performed by combining IGMP joining and application layer signaling, or may be performed as a separate time signaling procedure as described in FIG. 2. As described above, the terminal acquires a mapping table for broadcast reception.

Thereafter, the terminal receives a broadcast channel selected by the user in step 419. That is, when a user selects a broadcast channel, the application layer of the terminal delivers the MCID for the corresponding broadcast channel to the MAC layer, and the MAC / PHY layer decodes the broadcast traffic corresponding to the MCID and transmits the same to the upper layer. To this end, the terminal should have a cross-layer interface, as described above.

After that, if the user selects to unsubscribe from the broadcast service, the terminal transmits an IGMP rib message for releasing corresponding broadcast channels to the NE of the ASN in step 421. Here, the IGMP rib message may include a multicast IP address of at least one broadcast channel that the user wants to unsubscribe from. In addition, the IGMP rib message may be a message generated by the terminal itself, or may be a message in response to a periodic query of the ASN.

When the IGMP rib message is received from the terminal, the NE of the ASN determines whether all terminals are left in the corresponding MBS zone (or broadcast channel) in step 423. If none of the broadcast service subscribers exist for the corresponding MBS zone (or broadcast channel), the NE of the ASN deactivates the corresponding MBS zone (or broadcast channel) in step 425 and the corresponding MBS zone (or broadcast channel). A broadcast off notification message indicating deactivation is transmitted to the broadcast server. Then, in step 427, the broadcast server transmits a notify acknowledgement message to the NE of the ASN. In this case, signaling of steps 425 and 427 can be omitted.

As described above, FIG. 4 illustrates a case where a user group is managed by an AS, and an IGMP interworking procedure occurs between a UE and an SN (ASN_GW) of an ASN.

The embodiment of the present invention described above assumes multi-BS MBS. If the difference between the single-BS MBS is as follows. In the case of single-BS MBS, since there is only one or a few broadcast channels in one MBS zone, the client program of the terminal does not have to acquire the MCID. That is, the MAC layer may receive all broadcast channels of the MBS zone and transmit them to the upper layer, and the application layer may filter a desired broadcast channel using the content ID. In this case, even if the encryption key is not used or used, only one MBS zone can be set and used.

In addition, in the case of single-BS MBS, since the request of the service recipient is generally stored in the CSN in advance, the subscription procedure may be operated in push mode rather than pull mode. In addition, broadcast on / off may be performed in units of broadcast channels. That is, the NE (ASN or CSN) managing the user group for each broadcasting channel periodically queries IGMP-joined terminals for each broadcasting channel to check whether to leave the subscription, and all terminals for a specific broadcasting channel leave. ), The service for the corresponding broadcast channel is turned off.

Hereinafter, a detailed operation of the NE for managing user groups to support dynamic multicast transmission will be described.

5 illustrates an operation procedure of a broadcast server in a wireless communication system according to an embodiment of the present invention.

Referring to FIG. 5, the broadcast server first checks whether an IGMP join message is received from the terminal in step 501. The IGMP join message includes multicast IP addresses for broadcast channels that the user wants to subscribe to.

When the IGMP message is received from the terminal, the broadcast server authenticates the service subscription of the terminal in association with an authentication server (AAA server) in step 503. In operation 505, the broadcast server determines whether authentication of the terminal is successful. If authentication fails, the broadcast server proceeds to step 517 to perform authentication failure processing.

If authentication is successful, in step 507, the broadcast server broadcasts a broadcast on notification message for activating an MBS zone (or broadcast channel) for providing a broadcast service to the terminal. : ASN_GW equipped with MCBCS DPF). Then, the NE of the ASN activates the corresponding MBS zone (or broadcast channel) in response to the broadcast on notification message. In this case, the broadcast server may receive a response to the broadcast on notification message from the NE of the ASN.

In step 509, the broadcast server configures a mapping table including (content ID, multicast IP address, MCID), MBS zone ID, encryption key, and valid time for each broadcast channel desired by the terminal. In operation 511, the broadcast server transmits a message including the mapping table to the terminal through an application layer.

As such, after activating a specific MBS zone (or broadcast channel), the broadcast server determines in step 513 whether all terminals are leaved for the corresponding MBS zone (or broadcast channel). If no broadcast service subscriber exists for the corresponding MBS zone (or broadcast channel), the broadcast server broadcasts a broadcast off notification message to deactivate the MBS zone (or broadcast channel) in step 515. Is transmitted to the corresponding NE of the ASN. Then, the NE of the ASN deactivates the MBS zone (or broadcast channel) in response to the broadcast off notification message. At this time, the broadcast server may receive a response to the broadcast off notification message from the NE of the ASN.

6 illustrates an ASN_GW operation procedure in a wireless communication system according to an embodiment of the present invention.

Referring to FIG. 6, ASN_GW first checks whether an IGMP join message is received from the UE in step 601. The IGMP join message includes multicast IP addresses for broadcast channels that the user wants to subscribe to.

When the IGMP message is received from the terminal, in step 603, the ASN_GW transmits an authentication request message including multicast IP addresses for the desired broadcast channels and the MBS zone ID to which the terminal belongs to the broadcast server. Then, the broadcast server authenticates the service subscription of the terminal in association with an authentication server (AAA server).

In step 605, the ASN_GW receives an authentication request response message including an authentication result from the broadcast server. In operation 607, the ASN_GW interprets the response message to determine whether authentication of the terminal is successful. If authentication fails, the broadcast server proceeds to step 619 to perform authentication failure processing.

If authentication is successful, the ASN_GW transmits a broadcast on notification message indicating activation of an MBS zone (or broadcast channel) for providing a broadcast service to the terminal (step 609). . In step 611, the ASN_GW starts service for the corresponding MBS zone (or broadcast channel).

As such, after activating a specific MBS zone (or broadcast channel), the ASN_GW determines in step 613 whether all terminals are leaved for the corresponding MBS zone (or broadcast channel). If there is no broadcast service subscriber for the corresponding MBS zone (or broadcast channel), the ASN_GW sends a broadcast off notification message indicating deactivation of the corresponding MBS zone (or broadcast channel) in step 615. Send to the broadcast server. In step 617, the ASN_GW terminates the service for the corresponding MBS zone (or broadcast channel).

7 shows a configuration of ASN_GW according to an embodiment of the present invention. Hereinafter, it is assumed that user group management for dynamic multicast transmission is performed in the ASN_GW.

As shown, the ASN_GW includes a control unit 700, an R3 interface unit 702, an R6 interface unit 704, a buffer 706, a packet synchronizer 708, and a tunneling packet generator 710.

Referring to FIG. 7, the controller 700 controls the overall operation of the ASN_GW. In addition, the control unit 700 manages various information for a broadcast service, and manages a user group for dynamic multicast transmission according to the present invention.

The R3 interface unit 702 analyzes an IP packet received from a broadcast server (MCBCS server), generates a transmission IP packet, and transmits the generated IP packet to the broadcast server. In this case, when it is determined that the received packet is signaling, the R3 interface unit 702 extracts signaling information from the received packet and provides it to the controller 700. In addition, the R3 interface unit 702 generates a packet including signaling information and transmits the packet to the broadcast server under the control of the control unit 700.

The R6 interface unit 704 interprets the IP packet received from the base station BS, generates a transmission IP packet, and transmits the generated IP packet to the base station. In this case, when it is determined that the received packet is signaling, the R6 interface unit 704 extracts signaling information from the received packet and provides it to the controller 700. In addition, the R3 interface unit 704 generates a packet including signaling information and transmits the packet to the base station under the control of the control unit 700.

Meanwhile, the R3 interface unit 702 classifies IP packets received for bearer traffic by R3 multicast IP addresses, and stores the classified packets in the buffer 706. The buffer 706 stores the R3 MIP (Multicast IP) packet from the R3 interface unit 702 in the corresponding MCID queue of the MBS zones, and outputs the packet under the control of the control unit 700.

The packet synchronizer 708 divides and packs the packets from the buffer 706 according to the burst size of the radio section to generate a MAC service data unit (SDU). The tunneling packet generator 710 timestamps the absolute broadcast time (frame number) to each MAC SDU (Service Data Unit) from the packet synchronizer 708, and generates a GRE (Generic Route) before the MAC SDU. An encapsulation header is added to generate a tunneling packet (GRE packet) to the R6 interface unit 704. In this case, broadcast related information such as MBS zone ID and MCID may be recorded in the GRE header.

Then, the R6 interface unit 704 attaches the R6 multicast IP header for multicast to the GRE packet to generate an IP packet, attaches an L2 header (Ethernet header) to the IP packet, and physical layer to enable actual transmission. Encode and multicast to base stations in the MBS zone.

Looking at the operation of the present invention based on the above configuration as follows.

The controller 700 includes a memory table (database) for managing a user group joined to each of the currently active MBS zones (or broadcast channels) and the MBS zones (or broadcast channels).

The R6 interface unit 702 interprets the IP packet received through the R3 interface, and transfers the information of the IGMP join message to the controller 700 when an IGMP join message is received from the terminal. Here, the IGMP join message includes multicast IP addresses for the broadcasting channels that the terminal wants to subscribe to, and an MBS zone ID to which the terminal belongs. When the IGMP join message is received from the terminal, the controller 700 requests a service server for the terminal to authenticate the service. That is, the R3 interface unit 704 generates an authentication request message including multicast IP addresses and MBS zone IDs for broadcast channels desired by the terminal under the control of the controller 700, and the authentication request message. Is transmitted to the broadcast server through the R3 interface. Thereafter, the R3 interface unit 704 receives a response message for the authentication request message from the broadcast server, and transfers information of the response message to the controller 700.

Then, the controller 700 examines the information of the response message to determine whether authentication for the terminal is successful. If the authentication is successful, the controller 700 activates an MBS zone (or broadcast channel) for providing a broadcast service to the terminal. That is, the ASN_GW transmits the broadcast content for the MBS zone (or broadcast channel) to the base stations of the MBS zone through the R3 interface. In addition, the R3 interface unit 702 generates a broadcast on notification message indicating activation of the MBS zone (or broadcast channel) under the control of the controller 700, and the broadcast on notification message is generated. Send to broadcast server.

As such, after activating a specific MBS zone (or broadcast channel), the controller 700 determines whether all terminals are leaved for the corresponding MBS zone (or broadcast channel). That is, it is determined whether an IGMP rib message has been received from all of the terminals joined to a specific MBS zone (or broadcast channel). If it is determined that no broadcast service subscriber exists for the corresponding MBS zone (or broadcast channel), the controller 700 turns off the service for the corresponding MBS zone (or broadcast channel). The R3 interface unit 704 generates a broadcast off notification message indicating deactivation of the MBS zone (or broadcast channel) under the control of the control unit 700, and the broadcast off notification message is an R3 interface. Through the transmission to the broadcast server.

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 determined not only by the scope of the following claims, but also by the equivalents of the claims.

1 is a diagram illustrating a network structure according to an embodiment of the present invention.

2 is a diagram illustrating a procedure for a broadcast service in a wireless communication system according to an embodiment of the present invention.

3 is a diagram illustrating a broadcast service procedure for supporting dynamic multicast transmission in a wireless communication system according to an embodiment of the present invention.

4 is a diagram illustrating a broadcast service procedure supporting dynamic multicast transmission in a wireless communication system according to an embodiment of the present invention.

5 is a diagram illustrating an operation procedure of a broadcast server in a wireless communication system according to an embodiment of the present invention.

6 is a diagram illustrating an operation procedure of ASN_GW in a wireless communication system according to an embodiment of the present invention.

7 is a diagram illustrating a configuration of ASN_GW according to an embodiment of the present invention.

Claims (25)

In the method for providing a broadcast service in a wireless communication system, Transmitting, by the terminal, an IGMP join message for joining desired broadcast channels to a broadcast server; Performing, by the broadcast server, service authentication for the terminal in association with an authentication server; If the service authentication is successful, the broadcast server broadcasts a broadcast on notification message for activating an MBS zone or a broadcast channel for providing a broadcast service to the terminal, and a corresponding NE of an access service network (ASN). Sending it to the (Network Entity), And the NE of the ASN initiates a broadcast service for a corresponding MBS zone or broadcast channel in response to the broadcast on notification message. The method of claim 1, If the service authentication is successful, transmitting, by the broadcast server, a mapping table including MAC layer information to the terminal through an application layer; The terminal further comprises the step of receiving the content of the desired broadcast channel using the mapping table. The method of claim 2, The mapping table may include at least one of a content ID, a multicast IP address, a multicast connection IDentifier (MCID), an MBS zone ID, an encryption key, and an effective time. The method of claim 1, The broadcast server periodically generating an IGMP query message to terminals currently joined to a broadcast service and receiving a response message; If the response message is a leave message, the broadcast server, characterized in that the method further comprises the step of deleting the user from the user group for the MBS zone or broadcast channel. The method of claim 4, wherein Checking, by the broadcast server, whether all terminals are leaved with respect to the activated MBS zone or broadcast channel; Transmitting, by the broadcast server, a broadcast off notification message for deactivating the corresponding MBS zone or broadcast channel to the NE of the ASN when all terminals are leaved; The SN of the ASN further comprises the step of stopping the broadcast service for the corresponding MBS zone or broadcast channel in response to the broadcast off message. In the method for providing a broadcast service in a wireless communication system, Transmitting, by the terminal, an IGMP join message for joining desired broadcast channels to a corresponding NE of the ASN; Transmitting, by the NE of the ASN, a message requesting service authentication to the terminal to a broadcast server; Performing, by the broadcast server, service authentication for the terminal in association with an authentication server, and transmitting a response message including a service authentication result to the NE of the ASN; If service authentication is successful for the terminal, the NE of the ASN transmits a broadcast on notification message indicating activation of an MBS zone or a broadcast channel for providing a broadcast service to the terminal, to the broadcast server. Process, And the NE of the ASN includes starting a broadcast service for the MBS zone or a broadcast channel. The method of claim 6, When the service authentication for the terminal is successful, the broadcast server transmitting a mapping table including MAC layer information to the terminal through an application layer; The terminal further comprises the step of receiving the content of the desired broadcast channel using the mapping table. The method of claim 7, wherein The mapping table may include at least one of a content ID, a multicast IP address, a multicast connection IDentifier (MCID), an MBS zone ID, an encryption key, and an effective time. The method of claim 6, NE of the ASN periodically generates an IGMP query message to terminals currently joined to a broadcast service, and receives a response message; If the response message is a leave message, the broadcast server, characterized in that the method further comprises the step of deleting the user from the user group for the MBS zone or broadcast channel. The method of claim 9, NE of the ASN checks whether all terminals are leaved with respect to the currently active MBS zone or broadcast channel; If all the terminals are left, the method further comprising the step of stopping the broadcast service for the corresponding MBS zone or broadcast channel. The method of claim 10, And after the broadcast service is stopped, NE of the ASN transmits a broadcast off notification message indicating deactivation of the corresponding MBS zone or broadcast channel to the broadcast server. In the broadcast service providing method in the broadcast server of the core service network, Receiving an IGMP join message from the terminal for joining at least one broadcast channel; Performing service authentication for the terminal in association with an authentication server; When the authentication is successful, transmitting a broadcast on notification message for activating an MBS zone or a broadcast channel for providing a broadcast service to the terminal to a corresponding NE of the ASN; Updating a database for managing a user group joined to each of the currently active MBS zones or broadcast channels. The method of claim 12, If the authentication is successful, further comprising transmitting a mapping table including MAC layer information to the terminal through an application layer. The method of claim 13, The mapping table may include at least one of a content ID, a multicast IP address, a multicast connection IDentifier (MCID), an MBS zone ID, an encryption key, and an effective time. The method of claim 12, Periodically generating an IGMP query message to terminals currently joined to a broadcast service and receiving a response message; And if the response message is a leave message, removing the corresponding user from the user group for the corresponding MBS zone or broadcast channel. The method of claim 15, Checking whether all terminals are leaved with respect to the activated MBS zone or broadcast channel; When all the terminals are left, transmitting a broadcast off notification message for deactivating the corresponding MBS zone or broadcast channel to the NE of the ASN; Updating the database for managing the user group. In the broadcasting service providing method in the network entity of the access service network, Receiving an IGMP join message from the terminal to join at least one broadcast channel, Transmitting a request message requesting service authentication for the terminal to a broadcasting server, and receiving a response message including a service authentication result; When the service authentication for the terminal is successful, transmitting a broadcast on notification message indicating activation of an MBS zone or a broadcast channel for providing a broadcast service to the terminal to the broadcast server; Initiating a broadcast service for the MBS zone or broadcast channel; And updating a database for managing a user group joined to each of the currently active MBS zones or broadcast channels. The method of claim 17, Periodically generating an IGMP query message to terminals currently joined to a broadcast service and receiving a response message; And if the response message is a leave message, removing the corresponding user from the user group for the corresponding MBS zone or broadcast channel. The method of claim 18, Checking whether all UEs are left in the currently active MBS zone or broadcast channel; If all the terminals are left, the method further comprising the step of stopping the broadcast service for the corresponding MBS zone or broadcast channel. The method of claim 19, And after the broadcast service is stopped, transmitting a broadcast off notification message indicating deactivation of the corresponding MBS zone or broadcast channel to the broadcast server. In the network entity device for a broadcast service in an access service network, A first interface unit for communicating with a broadcast server through an R3 interface, A second interface unit for communicating with the base station through the R6 interface, A database for managing a user group joined to each of the currently active MBS zones or broadcast channels; When an IGMP join message for joining at least one broadcast channel is received from a terminal, a request message for requesting service authentication for the terminal is transmitted to the broadcast server through the R3 interface, and a response message including a service authentication result is provided. And a control unit which receives a broadcast service for the MBS zone or a broadcast channel and updates the database when the service authentication for the terminal is successful. The method of claim 21, wherein the control unit, And when a specific MBS zone or broadcast channel is activated, a broadcast on notification message indicating activation of the corresponding MBS zone or broadcast channel to the broadcast server through the R3 interface. The method of claim 22, The R6 interface unit periodically generates an IGMP query message to terminals currently joined to a broadcast service, receives a response message from the terminals, And if the response message is a leave message, the controller deletes the corresponding user from the user group for the corresponding MBS zone or broadcast channel. The method of claim 23, wherein the control unit, It is characterized by checking whether all terminals are leaved with respect to the currently active MBS zone or broadcast channel, and if all terminals are leaved, stopping the broadcast service for the corresponding MBS zone or broadcast channel. Device. The method of claim 19, wherein the control unit, And after the broadcast service is stopped, a broadcast off notification message indicating deactivation of the corresponding MBS zone or broadcast channel to the broadcast server through the R3 interface.

Images