KR101432226B1 - Apparatus and method for dynamic multicast transmission in broadband wireless communication system - Google Patents

Abstract

The present invention relates to an apparatus and a method for providing a broadcast service in a wireless communication system. A method for providing a broadcast service in a wireless communication system according to the present invention, the method comprising: transmitting, by a terminal, an IGMP join message for joining to desired broadcast channels to a broadcast server; The method comprising the steps of: performing a service authentication for the terminal; and, if the service authentication is successful, the broadcast server transmits a broadcast-on request for activating a specific MBS zone for providing a broadcast service to the terminal from among a plurality of MBS zones transmitting a broadcast on notification message to a corresponding NE of an Access Service Network (ASN); transmitting, by the NE in the ASN, a broadcast service for the specific MBS zone in response to the broadcast- ≪ / RTI >

Broadcasting service, broadband wireless access, dynamic multicast

Description

[0001] APPARATUS AND METHOD FOR DYNAMIC MULTICAST TRANSMISSION IN BROADBAND WIRELESS COMMUNICATION SYSTEM [0002]

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.

Generally, a communication system has evolved mainly in voice service, and is gradually evolving into a communication system capable of not only voice but also data service and various multimedia services. However, the voice-oriented communication system has not satisfied the service needs of users who are soaring because the transmission bandwidth is relatively small and the fee for use is high. In addition, due to the development of the telecommunication industry and the increase of users' demand for the internet service, there is a growing need for a communication system capable of efficiently providing the Internet service. Accordingly, the OFDM-based broadband wireless access system has been introduced to efficiently provide Internet services with a wide bandwidth sufficient to meet the rapidly increasing demand of users.

Major services of the broadband wireless access system include the Internet, Voice over IP (VoIP), and non-real-time streaming services. Recently, Multicast Broadcast Service (MBS), which is a real time broadcast service, has emerged as a new service. The broadcast service may be MBS (Multicast Broadcast Service) or MCBCS (MultiCast Broadcast Service) for WiMAX or Multi Media Broadcast and Multicast Service (MBMS) for WCDMA according to a standard group or an applied system, In the case of CDMA, it may be called BCMCS (Broadcast / Multicast Service), and may also be called DMB, MediaFLO, and the like.

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

On the other hand, it is becoming a big trend that a plurality of NSP (Network Service Providers) can provide desired broadcasting services to a single NAP (Network Access Provider) worldwide.

Generally, a broadcast service of a wireless network can be divided into a broadcast service and a multicast service depending on whether a user group is managed or not. Here, the broadcast service always provides a broadcast service irrespective of the presence or absence of a user, thereby wasting resources. Accordingly, it is necessary to provide a method for flexibly operating a broadcasting service according to the presence or absence of a user desiring a broadcasting service.

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

It is another object of the present invention to provide an apparatus and a method for minimizing resource waste due to a broadcast service.

It is still another object of the present invention to provide an apparatus and method for flexibly operating a broadcasting service according to the presence or absence of a user who wants a broadcasting service.

It is another object of the present invention to provide a method and apparatus for turning on a broadcast service when a broadcast service user exists in a specific MBS zone or a specific broadcast channel and turning off a broadcast service when there is no broadcast service receiver And a method.

According to one aspect of the present invention, there is provided a method for providing a broadcast service in a wireless communication system, the method comprising: transmitting, by a terminal, an IGMP join message to join a desired broadcast channel to a broadcast server; A step in which the broadcast server performs service authentication for the terminal in cooperation with an authentication server; and a step in which, if the service authentication is successful, the broadcast server transmits a broadcast service to the terminal from among a plurality of MBS zones Transmitting a broadcast on notification message for activating a specific MBS zone to a corresponding NE of an Access Service Network (ASN); transmitting, by the NE of the ASN, And initiating a broadcast service for the specific MBS zone.

According to another aspect of the present invention, there is provided a method for providing a broadcast service in a wireless communication system, the method comprising: transmitting an IGMP join message for joining a desired broadcast channel to a corresponding NE in an ASN; Transmitting a service authentication request message including an MBS zone information for the terminal to a broadcasting server, the broadcasting server performing a service authentication for the terminal in cooperation with an authentication server, And transmitting the response message to the NE of the ASN when the authentication of the service for the terminal is successful; and a step in which, when the service is successfully authenticated to the terminal, the broadcasting server activates a specific MBS zone corresponding to the MBS zone information among the plurality of MBS zones Transmitting a broadcast-on notification message to a NE of the ASN; and transmitting, by the NE, the broadcast service to the NE of the ASN In that it comprises a static features.
According to another aspect of the present invention, there is provided a method of providing a broadcast service in a broadcast server of a core service network, the method comprising: receiving an IGMP join message for joining at least one broadcast channel from a terminal; And transmitting a broadcast on notification message for activating a specific MBS zone for providing a broadcast service to the terminal from among a plurality of MBS zones when the authentication is successful, And updating a database for managing a user group joined to each of the currently activated MBS zones.
According to another aspect of the present invention, there is provided a method of providing a broadcast service in a network entity of an access service network, the method comprising: receiving, from an MS, an IGMP join message for joining at least one broadcast channel; Transmitting a service authentication request message including a service authentication request message including a service authentication result to a broadcast server and receiving a response message including a service authentication result; Receiving a broadcast on notification message for activating a specific MBS zone in the MBS zone from the broadcast server; initiating a broadcast service for the MBS zone; And updating the database for managing the user group.
According to another aspect of the present invention, there is provided a network entity apparatus for a broadcast service in an access service network, comprising: an R3 interface for communicating with a broadcast server via an R3 interface; A database for managing a user group joined to each of the currently activated MBS zones or broadcast channels, and an IGMP join message for joining at least one broadcast channel from the terminal to the MBS zone And a response message including a service authentication result is received, and when the service authentication for the MS is successful, the service authentication request message including the MBS A broadcast-on-box for activating a specific MBS zone corresponding to zone information Receives the message and, in response to the broadcast ON notification message initiating a broadcast service to the MBS zone, the device comprises a control unit for updating the database.

As described above, the present invention turns on a broadcast service when a broadcast service user exists in a specific MBS zone or a specific broadcast channel, and turns off a broadcast service when there is no broadcast service user. Therefore, There is an advantage that wireless resources can be efficiently used.

Hereinafter, the operation principle of the present invention will be described in detail with reference to the accompanying drawings. In the following description of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear. The following terms are defined in consideration of the functions of the present invention, and may be changed according to the intentions or customs of the user, the operator, and the like. Therefore, the definition should be based on the contents throughout this specification.

Hereinafter, the present invention proposes a method for flexibly operating a broadcasting service according to the presence or absence of a user who desires a broadcasting service.

Here, the broadcast service may be a multicast broadcast service (MCBCS), a multicast and broadcast service (MBS), a multi media broadcast and multicast service (MBMS), a broadcast / multicast service (BCMCS) And so on.

In the following description, the name of the network entity (NE) is defined according to the function, and may be changed according to the intention of the standardization group and the operator. For example, the base station may be referred to as an access point (AP), a radio access station (RAS), a node-B, or a base station (BS). Also, the base station controller may be referred to as an RNC (Radio Network Controller), a BSC (Base Station Controller), an ACR (Access Control Router), or an ASN-GW (Access Service Network-Gateway). Here, the ASN-GW can perform a router function as well as a base station controller function.

In addition, the wireless network will be described below with reference to an OFDM / OFDMA based broadband wireless access system, but the network structure according to the present invention can be easily applied to other wireless systems.

The matters to be considered for carrying out the present invention are as follows.

First, in the case of a broadcast service provided regardless of whether or not a broadcast service user is present, the terminal must be able to receive broadcasting in an idle or dormant state. In addition, the user must 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 must be able to read and utilize this information. That is, the MAC layer of the UE must be able to acquire a broadcast zone identifier and a broadcast channel MAC layer identifier without a separate interworking procedure with the network.

Third, the signaling overhead including 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 advantage of multi-BS (with macro diversity) should not be reduced.

Fourth, a network access provider (NAP) must manage broadcast channel requirements of different network service providers (NSPs) in an integrated manner so that wireless resources are not wasted.

The present invention is intended to efficiently perform dynamic multicast transmission in consideration of the above-mentioned matters. Here, the dynamic multicast transmission indicates that the broadcast service is turned on / off depending on whether the user is a broadcast service consumer.

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

A service provider (SP) server 10, an MCBCS server 20, an ASN_GW 30, and a base station 40, as shown in FIG. The ASN_GW 30 may be divided into an MCBCS proxy for processing signaling and an MCBCS DPF for processing bearer traffic. The MCBCS server 20 may also be divided into a C-plane for processing signaling, And U-plane processing traffic. Meanwhile, the ASN_GW 30 and the base station 40 can be classified into an access service network (ASN).

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

The MCBCS server 20 has an interface with an external service provider server 10 and an AAA server (not shown) and has a service guide (broadcast schedule table, mapping table, etc.) and a service right key per content . At this time, the MCBCS server 20 and the UE can communicate using an application layer protocol (e.g., HTTP). When a content registration request is received from the service provider server 10 through an application layer protocol (for example, HTTP), the MCBCS server 20 allocates a multicast IP address and a content ID to each content, (MBS Zone ID) and an MCID (Multicast CID). That is, the MCBCS server 20 has a content ID, a multicast IP address, a service time (delivery date, delivery time), a data rate, an MCID, an MBS zone ID, a transmission zone ID, Etc. as a mapping table. This mapping table is used to convey various signaling and bearer traffic to the 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 service flows (SFs), connections, 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 the CSN such as an AAA server and a broadcast server (MCBCS server). The MBS controller is configured in an access service network (e.g., a block in the ASN_GW), performs a data / time synchronization function for broadcast traffic from the MCBCS server 20, / 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 the broadcast content from the MBS controller in the ASN_GW 30 through a predetermined resource at a predetermined time. Here, when multi-BS MBS is supported for a broadcast service, base stations belonging to the same MBS zone broadcast the same content at the same time through the same resource.

The network manager (not shown) maintains and repairs the network entities of the ASN and delivers PLD (Program Lading Data) required for initialization of the ASN_GW 30 and the base station 40 to the corresponding network entity. Although not shown, a network manager (MCBCS OMC) for managing the MCBCS server 20 may exist. The network manager may be called an EMS server, a WMS server, or an OMC. The NAP pre-configures the relationship between the MBS zone ID and the BSID (Base Station IDentifier) through the EMS server and sets the air scheduling of the MCID and the MBS region according to the business contract with the NSPs scheduling. That is, the network manager transmits a configuration table to the corresponding NE according to the type of the NE (MCBCS server, ASN_GW, BS).

A terminal (not shown) is a main body that consumes 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 in an idle mode. The MCBCS server 20 authenticates the subscriber when a subscription request is received from the terminal, and if the authentication is successful, the MCBCS server 20 sends the service guide to the terminal. At this time, the service guide may include a broadcasting schedule (a content ID, a time, a transmission rate, etc.), a multicast IP address, an MCID, an MBS zone ID, an encryption key, have. The terminal can identify the current MBS zone through a broadcast message (e.g., DCD) including system parameters.

Although not shown, a policy server, an AAA (Authentication, Authorization, Accounting) server, and the like may be present in the core service network.

The AAA server may include a Subscription Profile Repository (SPR) function for managing authentication and billing information and for managing subscriber-specific profile information. In addition, the AAA server can manage broadcasting service authorization information per subscriber, a cryptographic key derived from initial authentication, and a life time. The policy server provides policy information (e.g., QoS policy information) determined by the operator (or operator) to the corresponding network entity. Here, the policy server may exist in the AAA server, in another network entity, or in a separate server.

On the other hand, it is assumed that the encryption and the lifetime of the application layer content are uniquely set for each broadcast zone (MBS zone ID), broadcasting station, or broadcast channel (MCID), not for each content. In the case of upper layer signaling, all these ciphering schemes can be accommodated.

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

Referring to FIG. 2, in step 201, the terminal requests a service guide to be freely distributed to a broadcast server (MCBCS server) of a core service network (CSN) through an application layer (for example, HTTP) And receives a response message including a guide. At this time, the service guide includes broadcasting schedule information (including a content ID) for each NSP. For example, the terminal user can access the WEB and download the broadcasting schedule information through the application layer. The service guide may further include a multicast IP address in addition to the content ID for each broadcast channel.

Then, in step 205, the terminal transmits a subscription request message to subscribe to the broadcast service to the broadcast server. In step 207, the broadcasting server authenticates the service subscription of the terminal in cooperation with the authentication server (AAA server). At this time, if the authentication is successful, the broadcasting server transmits a response message for the subscription request to the terminal in step 209. That is, the terminal requests the broadcasting server to receive the necessary information for receiving desired broadcast channels. Then, the broadcasting server authenticates the user in cooperation with an authentication server (e.g., AAA server). If the authentication is successful, the broadcasting server transmits (Content ID, multicast IP address, MCID) A mapping table including an ID, an encryption key, and a life time is transmitted to the terminal through the application layer. The mapping table may be transmitted to the terminal through the subscription procedure or may be transmitted to the terminal through the service guide acquisition procedure.

Here, since the cryptographic key is periodically updated according to the validity period, the terminal can periodically update the cryptographic key using the separate signaling procedure or the subscription procedure after the subscription procedure have. At this time, when performing the update procedure using the subscription procedure, an identifier indicating which information is to be updated for this subscription procedure should be defined. For example, the MCID update, the MCID update, and the encryption key update can be performed through the above subscription procedure, and at the same time, two updates or three updates can be performed.

Meanwhile, the subscription procedure may be performed in a pull mode or a push mode depending on a signaling method. In the pull mode, the terminal transmits a request message to the broadcast server, and the broadcast server responds with a response message. In the push mode, the broadcast server transmits the request message to the broadcast server, And transmits the 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 UE obtains the MBS zone ID of the serving subcell and the MBS zone ID list of the neighbor BSs to which the current UE is connected from the MAC layer, The desired MBS zone ID can be transmitted to the broadcasting server by putting it in the request message. That is, the UE can acquire MCIDs and encryption keys for a desired MBS zone. As another example, when the request message includes (MBS zone ID, MCID), the encryption key and the valid time for the desired broadcast channel can be obtained. That is, when using the pull mode, the subscription procedure can be flexibly operated.

The procedure of acquiring the service guide (steps 201 and 203) and the subscription procedure (steps 205 to 209) may be performed by a single signaling procedure rather than a separate procedure. The MBS zone ID, the MCID, and the multicast IP address are preferably transmitted to the mobile station in the subscription procedure, but may be transmitted to the mobile station including the above information in the service guide free of charge without authentication. In this case, the terminal can acquire the encryption key and the valid time for the desired broadcast channel through the subscription procedure.

As described above, the terminal acquires a mapping table (e.g., a content ID: a 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 UE acquires the MCID corresponding to the corresponding broadcast channel through the mapping table, and transmits the MCID to the MAC layer to instruct reception of the corresponding broadcast channel. To do this, the terminal must have a cross-layer interface. The interface between the client program and the MAC layer includes an interface between the client program and the IP layer and an interface between the client program and the MAC layer. In the case of the interface between the client program (application layer) and the MAC layer, the MBS zone ID and the MCID The application layer obtains the MBS zone ID from the MAC layer, and the obtained MBS zone ID acquires the MCID, the cryptographic key, and the validity time for the corresponding MBS zone .

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 UE decodes the 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 process.

In this manner, when the mapping table is acquired and managed in the application layer, the terminal can receive the broadcast channel, change the channel, and delete the broadcast channel without interworking with the network. In particular, the terminal can receive a broadcast channel without network interlocking even in an idle or dormant state.

2, the join procedure may be implemented by a combination of an IGMP join of the UE and application layer signaling. This will be described in detail later with reference to FIG.

A method for implementing a dynamic multicast transmission according to the procedure of FIG. 2 will be described below. The dynamic multicast transmission refers to turning on / off the broadcast service depending on the presence or absence of a user desiring a broadcast service.

FIG. 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 freely distributed to a broadcast server of the core service network, and acquires the service guide from the broadcast server. At this time, the service guide includes broadcasting 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.

Then, in step 303, the terminal receives broadcast channels desired to be subscribed to by the user. If the broadcast channels desired to join are selected, the terminal transmits an IGMP join message to the broadcast server in step 305 to join the selected broadcast channels. At this time, the IGMP join message includes multicast IP addresses for the selected broadcast channels.

In step 307, the broadcasting server authenticates the service subscription of the terminal in cooperation with an authentication server (AAA server). At this time, if the authentication is successful, the broadcast server transmits a broadcast on notify message activating an MBS zone (or a broadcast channel) for providing a broadcast service to the terminal in step 309, NE (eg, ASN_GW with MCBCS DPF). In step 311, the corresponding NE of the ASN activates a broadcast service for the corresponding MBS zone (or broadcast channel) in response to the broadcast-on-notification message, and transmits an Acknowledgment message for the broadcast- To the 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. Also, once a specific MBS zone (or a broadcast channel) is activated, the broadcast server may broadcast a message (e.g., an IP layer message) indicating that the corresponding MBS zone (or broadcast channel) is activated to all terminals. In this case, it is possible to eliminate unnecessary signaling that the terminal joins to the already activated broadcast channel.

Meanwhile, in step 313, the broadcasting server transmits a content ID, a multicast IP address, an MCID, an MBS zone ID, an encryption key, and a life time for each desired broadcast channel And transmits the mapping table to the terminal through the application layer. In step 315, the terminal stores the mapping table and transmits a subscription acknowledgment message to the broadcast server. As such, the join procedure can be implemented in combination with IGMP join and application layer signaling. In another embodiment, as illustrated in FIG. 2, the subscription procedure may be in a separate signaling procedure.

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

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

Thereafter, when the user leaves the subscription to the broadcast service, the terminal forwards an IGMP leave message for releasing the corresponding broadcast channels to the broadcast server in step 319. Here, the IGMP Rive message may include a multicast IP address of at least one broadcast channel for which a user desires to subscribe and unsubscribe. In addition, the IGMP Rive message may be a message generated by the terminal itself or a message responding to a periodic query of the broadcast server.

When the IGMP Rib message is received from the terminal, the broadcasting server determines in step 321 whether all terminals are left for the MBS zone (or broadcast channel). If there is no broadcast service subscriber for the corresponding MBS zone (or broadcast channel), the broadcast server transmits a broadcast off notification message for deactivating the MBS zone (or broadcast channel) in step 323 To the corresponding NE in the ASN (e.g., ASN_GW with the MCBCS DPF). In step 325, the corresponding NE of the ASN deactivates the broadcast service for the 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 shows a case where a user group is managed in the CSN, and the IGMP association procedure occurs between the terminal and the NE (broadcast server) of the CSN. Here, the broadcast on / off for the MBS zone (or broadcast channel) can utilize the R3 signaling interface.

Hereinafter, the case where 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, the terminal first requests a service guide distributed freely in step 401, and receives the service guide from the broadcast server in step 403. FIG. At this time, the service guide includes broadcasting 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.

In step 403, the terminal selects a broadcast channel for which the user desires to subscribe to the service. In step 405, the terminal transmits an IGMP join message for subscribing to the selected broadcast channels to a corresponding NE (e.g., ASN_GW provided with MCBCS PDF) of the ASN. At this time, the IGMP join message includes multicast IP addresses for the selected broadcast channels.

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

At this time, if the authentication is successful, the broadcasting server transmits an authentication response message to the NE of the ASN indicating the authentication success in step 411. Then, the NE of the ASN activates an MBS zone (or a broadcast channel) for providing a broadcast service to the terminal in step 413, and transmits a broadcast on notification message indicating activation of the MBS zone (or a broadcast channel) To the broadcast server. In step 414, the broadcast server transmits a notify acknowledgment message to the NE of the ASN. The signaling in steps 413 and 414 may be omitted. For example, if the corresponding MBS zone (or broadcast channel) has already been activated, the broadcast-on notification message may be omitted.

If the authentication of the terminal is successful, in step 415, the broadcasting server transmits a content ID (multicast IP address vs MCID) for each desired broadcast channel, an MBS zone ID, a cryptographic key, And the like to the terminal through the application layer. In step 417, the terminal stores the mapping table and transmits a subscription acknowledgment message to the broadcasting server. As described above, the join procedure can be performed by combining the IGMP join and the application layer signaling, or can be performed by a separate task nulling procedure as illustrated in FIG. As described above, the terminal acquires a mapping table for broadcast reception.

In step 419, the terminal receives the broadcast channel selected by the user. That is, when the user selects a broadcast channel, the application layer of the UE 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 delivers the broadcast traffic to the upper layer. To this end, the terminal must have a cross-layer interface as described above.

Thereafter, if the user selects unsubscribe from the broadcast service, the terminal transmits an IGMP Rib message to the NE of the ASN in step 421 for releasing the corresponding broadcast channels. Here, the IGMP Rive message may include a multicast IP address of at least one broadcast channel that the user desires to join. Also, the IGMP Rive message may be a self-generated message and may be a message in response to a periodic query of the ASN.

When the IGMP Rib message is received from the UE, the NE of the ASN determines whether all the UEs have left the MBS zone (or the broadcast channel) in step 423. If there is no broadcast service subscriber 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 transmits a broadcast off notification message indicating deactivation to the broadcast server. In step 427, the broadcast server transmits a notify acknowledgment message to the NE of the ASN. The signaling in steps 425 and 427 may be omitted.

As described above, FIG. 4 shows a case where the user group is managed by the AS, and the IGMP association procedure occurs between the terminal and the NE (ASN_GW) of the ASN.

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

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

Hereinafter, the specific operation of the NE managing the user group 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, in step 501, the broadcast server checks whether an IGMP join message is received from a terminal. The IGMP join message includes multicast IP addresses for broadcast channels to which a user wishes to subscribe.

When the IGMP message is received from the terminal, the broadcasting server performs authentication with the authentication server (AAA server) in step 503 to authenticate the service subscription of the terminal. In step 505, the broadcasting server determines whether authentication of the terminal is successful. If the authentication fails, the broadcast server proceeds to step 517 and performs an authentication failure process.

If the authentication is successful, the broadcast server transmits a broadcast on notification message for activating an MBS zone (or a broadcast channel) for providing a broadcast service to the terminal in step 507, : ASN_GW 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. At this time, the broadcasting server can 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 desired broadcast channel. In step 511, the broadcast server transmits a message including the mapping table to the terminal through an application layer.

After activating a specific MBS zone (or a broadcast channel), the broadcast server determines whether all terminals have been left for the MBS zone (or broadcast channel) in step 513. [ If there is no broadcast service subscriber for the corresponding MBS zone (or broadcast channel), the broadcast server transmits a broadcast off notification message for deactivating the corresponding MBS zone (or broadcast channel) in step 515 To the corresponding NE in the ASN. Then, the NE of the ASN deactivates the corresponding MBS zone (or broadcast channel) in response to the broadcast-off notification message. At this time, the broadcast server can receive a response to the broadcast-off notification message from the NE of the ASN.

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

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

In step 603, when the IGMP message is received from the terminal, the ASN_GW transmits an authentication request message including the multicast IP addresses of the broadcast channels desired by the terminal and the MBS zone ID to which the terminal belongs to the broadcasting server. Then, the broadcasting server interlocks with the authentication server (AAA server) to authenticate the service subscription of the terminal.

In step 605, the ASN_GW receives an authentication request response message including the authentication result from the broadcast server. In step 607, the ASN_GW analyzes the response message to determine whether authentication of the terminal is successful. If the authentication fails, the broadcast server proceeds to step 619 and performs an authentication failure process.

If the authentication is successful, the ASN_GW 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 in step 609 . In step 611, the ASN_GW starts a service for the MBS zone (or broadcast channel).

After activating a specific MBS zone (or a broadcast channel), the ASN_GW determines whether all the MBS zones (or broadcast channels) have been left in the corresponding MBS zone (or broadcast channel) in step 613. If there is no broadcast service subscriber for the corresponding MBS zone (or broadcast channel), the ASN_GW transmits a broadcast off notification message indicating inactivation of the MBS zone (or broadcast channel) in step 615 To the broadcast server. In step 617, the ASN_GW terminates the service for the MBS zone (or broadcast channel).

FIG. 7 shows a configuration of an 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 synchronization unit 708, and a tunneling packet generation unit 710.

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

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

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

Meanwhile, the R3 interface unit 702 classifies IP packets received for bearer traffic according to the R3 multicast IP address, and stores the classified packets in the buffer 706. FIG. The buffer 706 stores an R3 MIP (Multicast IP) packet from the R3 interface 702 in a corresponding MCID queue of the MBS zones, and outputs the packet under the control of the controller 700. [

The packet synchronization unit 708 generates a MAC SDU (Service Data Unit) by fragmenting and packing the packets from the buffer 706 according to the burst size of the radio section. The tunneling packet generator 710 time-stamps the broadcast absolute time (frame number) to each MAC SDU (Service Data Unit) from the packet synchronizer 708 and performs GRE (Generic Route (GRE packet) to the R6 interface unit 704. The R6 interface unit 704 receives the tunneling packet (GRE packet) At this time, broadcast related information such as MBS zone ID and MCID may be recorded in the GRE header.

Then, the R6 interface unit 704 adds an 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 multicasts to the base stations in the corresponding MBS zone.

The operation of the present invention based on the above-described configuration will be described below.

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

The R6 interface unit 702 interprets the IP packet received through the R3 interface. When the IGMP join message is received from the terminal, the R6 interface unit 702 transmits the IGMP join message information to the controller 700. FIG. Here, the IGMP join message includes multicast IP addresses for broadcast channels to which the UE desires to subscribe, an MBS zone ID to which the UE belongs, and the like. When the IGMP join message is received from the terminal, the controller 700 requests the terminal to authenticate the service for the terminal. That is, under the control of the controller 700, the R3 interface unit 704 generates an authentication request message including multicast IP addresses and MBS zone IDs for the desired broadcast channels, To the broadcast server via the R3 interface. Then, the R3 interface unit 704 receives a response message for the authentication request message from the broadcast server, and transmits the response message information to the controller 700. [

Then, the controller 700 checks information of the response message to determine whether authentication of the terminal is successful. If the authentication is successful, the controller 700 activates an MBS zone (or a broadcast channel) for providing a broadcast service to the terminal. That is, the ASN_GW transmits the broadcast content for the corresponding MBS zone (or broadcast channel) to the base stations of the MBS zone through the R3 interface. 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 transmits the broadcast- To the broadcast server.

After activating a specific MBS zone (or a broadcast channel), the controller 700 determines whether all terminals are left in the MBS zone (or broadcast channel). That is, it is determined whether or not the IGMP Rib messages have been received from all the terminals that have joined the specific MBS zone (or broadcast channel). If it is determined that there is no broadcast service subscriber for the MBS zone (or broadcast channel), the controller 700 turns off the service for the MBS zone (or broadcast channel). The R3 interface unit 704 generates a broadcast off notification message indicating that the MBS zone (or a broadcast channel) is inactivated under the control of the controller 700 and transmits the broadcast off notification message to the R3 interface To the broadcast server.

While the present invention has been described in connection with what is presently considered to be the most practical and preferred embodiment, it is to be understood that the invention is not limited to the disclosed embodiments, but is capable of various modifications within the scope of the invention. Therefore, the scope of the present invention should not be limited by the illustrated embodiments, but should be determined by the scope of the appended claims and equivalents thereof.

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

2 illustrates 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 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 flowchart 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 an ASN_GW in a wireless communication system according to an embodiment of the present invention.

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

Claims (25)

A method for providing a broadcast service in a wireless communication system, Transmitting, by the terminal, an IGMP join message for joining to desired broadcast channels to a broadcast server; The broadcasting server performing service authentication for the terminal in cooperation with an authentication server; If the service authentication is successful, the broadcast server transmits a broadcast on notification message to an ASN (Access Service Network) for activating a specific MBS zone for providing a broadcast service to the terminal from among a plurality of MBS zones, To a corresponding NE (Network Entity) And the NE of the ASN initiating a broadcast service for the specific MBS zone in response to the broadcast-on-notification message. The method according to claim 1, And transmitting the mapping table including the MBS zone identification information, the encryption key and the validity time for the desired broadcast channel to the terminal through the application layer when the service authentication is successful In addition, Wherein the encryption key and the validity time are uniquely set for each MBS zone. The method according to claim 1, The broadcast server transmits a broadcast on notification message for activating a specific MBS for providing a broadcast service to the terminal from among a plurality of MBS zones to a corresponding NE of an Access Service Network (ASN) However, Confirming an active state of the specific MBS zone; And transmitting a broadcast on notification message to the corresponding NE when the specific MBS zone is in an inactive state, When the specific MBS zone is active, omitting transmission of a broadcast-on-notification message to the corresponding NE, Wherein the broadcasting server broadcasts the active state of the specific MBS zone to the terminal. The method according to claim 1, The broadcasting server periodically generates an IGMP query message to terminals that are currently joined to the broadcast service and receives a response message, If the response message is a leave message, deleting the corresponding user from the MBS zone or the user group for the broadcast channel, if the response message is a leave message. 5. The method of claim 4, Checking whether all the terminals are left in the active MBS zone or the broadcast channel; Transmitting, by the broadcasting server, a broadcast off notification message for deactivating a corresponding MBS zone or a broadcast channel to the NE of the ASN when all the terminals are left; Further comprising the step of the NE of the ASN stopping the broadcast service for the MBS zone or the broadcast channel in response to the broadcast off message. A method for providing a broadcast service in a wireless communication system, Transmitting an IGMP join message for joining to desired broadcast channels to a corresponding NE in the ASN, Transmitting, by the NE of the ASN, a service authentication request message including MBS zone information for the terminal to a broadcasting server; Transmitting a response message including a service authentication result to a NE of the ASN, performing a service authentication for the terminal in cooperation with an authentication server, When the service authentication of the terminal is successful, the broadcast server transmits a broadcast on notification message for activating a specific MBS zone corresponding to the MBS zone information among a plurality of MBS zones to the NE of the ASN Transmitting, And the NE of the ASN initiating a broadcast service for the specific MBS zone. The method according to claim 6, When the service authentication for the terminal is successful, the broadcasting server transmits to the terminal through the application layer a mapping table including MBS zone identification information, a cryptographic key, and an effective time for the desired broadcasting channel Further comprising: Wherein the encryption key and the validity time are uniquely set for each MBS zone. The method according to claim 6, The broadcast server transmits a broadcast on notification message for activating a specific MBS for providing a broadcast service to the terminal from among a plurality of MBS zones to a corresponding NE of an Access Service Network (ASN) However, Confirming an active state of the specific MBS zone; And transmitting a broadcast on notification message to the corresponding NE when the specific MBS zone is in an inactive state, When the specific MBS zone is active, omitting transmission of a broadcast-on-notification message to the corresponding NE, Wherein the broadcasting server broadcasts the active state of the specific MBS zone to the terminal. The method according to claim 6, Wherein the ASN NE periodically generates an IGMP query message to terminals currently joined to the broadcast service and receives a response message, And if the response message is a leave message, deleting the corresponding user from the MBS zone or the user group for the broadcast channel, if the response message is a leave message. 10. The method of claim 9, Checking whether all the terminals are left for an MBS zone or a broadcast channel currently active in the ASN; And stopping the broadcast service for the MBS zone or the broadcast channel if all the terminals are left. 11. The method of claim 10, Further comprising the step of, after the interruption of the broadcast service, transmitting a broadcast off notification message indicating that the NE of the ASN deactivates the MBS zone or the broadcast channel to the broadcast server. A method for providing a broadcast service in a broadcast server of a core service network, Receiving an IGMP join message for joining at least one broadcast channel from a terminal; Performing service authentication for the terminal in cooperation with an authentication server; Transmitting a broadcast on notification message for activating a specific MBS zone for providing a broadcast service to the terminal from a plurality of MBS zones to a corresponding NE in the ASN when the authentication is successful; And updating a database for managing a user group joined to each of the currently active MBS zones. 13. The method of claim 12, If the authentication is successful, transmitting the mapping table including the MBS zone identification information, the encryption key, and the valid time for the desired broadcast channel to the terminal through the application layer, Wherein the encryption key and the validity time are uniquely set for each MBS zone. 13. The method of claim 12, A process of transmitting a broadcast on notification message for activating a specific MBS for providing a broadcast service to the terminal from a plurality of MBS zones to a corresponding NE of an Access Service Network (ASN) Confirming an active state of the specific MBS zone; And transmitting a broadcast on notification message to the corresponding NE when the specific MBS zone is in an inactive state, When the specific MBS zone is active, omitting transmission of a broadcast-on-notification message to the corresponding NE, Wherein the broadcasting server broadcasts the active state of the specific MBS zone to the terminal. 13. The method of claim 12, Periodically generating an IGMP query message to terminals currently joined to the broadcast service and receiving a response message; Further comprising the step of, if the response message is a leave message, deleting the corresponding user from the MBS zone or the user group for the broadcast channel. 16. The method of claim 15, Checking whether all terminals are left for the activated MBS zone or the broadcast channel, Transmitting a broadcast off notification message for deactivating a corresponding MBS zone or a broadcast channel to the NE of the ASN when all the terminals are left; Further comprising the step of updating the database managing the user group. A method for providing a broadcast service in a network entity of an access service network, Receiving an IGMP join message for joining at least one broadcast channel from a terminal; Transmitting a service authentication request message including MBS zone information for the MS to a broadcast server and receiving a response message including a service authentication result; Receiving, from the broadcast server, a broadcast on notification message for activating a specific MBS zone corresponding to the MBS zone information among a plurality of MBS zones when service authentication for the terminal is successful; Starting a broadcast service for the MBS zone, And updating the database for managing a user group joined to each of the currently active MBS zones. 18. The method of claim 17, Periodically generating an IGMP query message to terminals currently joined to the broadcast service and receiving a response message; Further comprising the step of, if the response message is a leave message, deleting the corresponding user from the MBS zone or the user group for the broadcast channel. 19. The method of claim 18, Checking whether all terminals are left for an MBS zone or a broadcast channel that is currently active; And stopping the broadcast service for the MBS zone or the broadcast channel if all the terminals are left. 20. The method of claim 19, Further comprising the step of transmitting a broadcast off notification message indicating the inactivation of the MBS zone or the broadcast channel to the broadcast server after the broadcast service is stopped. A network entity apparatus for a broadcast service in an access service network, An R3 interface for communicating with the broadcast server via the R3 interface, An R6 interface for communicating with the base station via 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 the terminal, transmits a service authentication request message including MBS zone information for the terminal to the broadcast server through the R3 interface, And receiving a broadcast-on-notification message for activating a specific MBS zone corresponding to the MBS zone information among a plurality of MBS zones when the service authentication for the terminal is successful, And a control unit for starting a broadcast service for the MBS zone in response to the message and updating the database. 22. The apparatus of claim 21, When the specific MBS zone or the broadcast channel is activated, transmits a broadcast-on-notification message indicating activation of the MBS zone or the broadcast channel to the broadcast server through the R3 interface. 23. The method of claim 22, The R6 interface unit periodically generates an IGMP query message to terminals currently joined to the broadcast service, receives a response message from the terminals, Wherein when the response message is a leave message, the control unit deletes the user from the MBS zone or the user group for the broadcast channel. 24. The apparatus of claim 23, And checking whether all terminals are left for an MBS zone or a broadcast channel that is currently active and stopping a broadcast service for a corresponding MBS zone or a broadcast channel when all the terminals are left. Device. 22. The apparatus of claim 21, And transmits a broadcast off notification message indicating disabling of the MBS zone or the broadcast channel to the broadcast server through the R3 interface after the broadcast service is stopped.

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