KR101310217B1 - Apparatus and method for allocating multicast connection indetifier in wireless connection system - Google Patents

Abstract

The present invention relates to an apparatus and method for allocating a multicast connection identifier in a wireless access system, and more particularly, to an apparatus and method for allocating a multicast connection identifier to a user using a multicast and broadcast service (MBS) mode in a wireless access system. It is about.
In the method for allocating a multicast connection type generator in a wireless access system according to an embodiment of the present invention, an MBS channel is selected, a buffer allocation policy is performed, and a buffer space of a predetermined size is allocated according to the buffer allocation policy. Each type is assigned for each type, the MCID value is assigned to the data according to the connection request of the MBS channel, the frame having the MBS burst region corresponding to the MCID is received, and the data of the MBS burst region corresponding to the MCID is classified. Extract the data, and store the extracted data in a buffer area corresponding to the MCID of the extracted data. The MBS channel is identified and serviced using the multicast IP address information included in the IP header of the data stored in the buffer area.

Description

Apparatus and method for assigning multicast connection identifier in wireless access system {APPARATUS AND METHOD FOR ALLOCATING MULTICAST CONNECTION INDETIFIER IN WIRELESS CONNECTION SYSTEM}

The present invention relates to an apparatus and method for allocating a multicast connection identifier in a wireless access system, and more particularly, to an apparatus and method for allocating a multicast connection identifier to a user using a multicast and broadcast service (MBS) mode in a wireless access system. It is about.

In general, communication systems have been developed mainly for voice services, and are gradually developing as 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 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. As a result, wireless access systems have been introduced to efficiently provide Internet services with broadband enough to meet the demands of rapidly increasing users.

The wireless access system is a system for integrating and supporting not only voice but also various low speed and high speed data services and multimedia application services such as high definition video. Such multimedia data is transmitted through various networks such as terrestrial, cable, and IP according to H.262, for example, the MPEG2-TS standard.

MPEG2-TS classifies multimedia data into elementary streams (ES), which are video, audio, and other data.Each ES is further classified into a packetized elementary stream (PES) of up to 64 kilobytes (Kbytes). It is delivered using a packet header that meets the characteristics of. If the transport network is IP, the PES is divided into fixed length packets of 188 bytes and then delivered to the subscriber by adding a header such as RTP / UDP / IP.

In the standard of the wireless access system, for example, IEEE 802.16, there is a multicast and broadcast service (MBS) service specification that can provide multicast and broadcast to a plurality of mobile terminals. do. In the MBS standard, the same multicast and broadcast service areas can be distinguished through different CIDs (Connection Identifiers) or different SAs (Security Associations).

In this case, the MBS zone (MBS_ZONE) is used to indicate that the broadcast and multicast service is available through the CID and SA, and the base station uses the downlink channel descriptor (DDC) message to inform the MBS zone information. Broadcasts. That is, the MBS zone may be referred to as a base station group that uses the same CID and SA to transmit content.

The MBS service can simultaneously transmit various channels such as high-definition video and high-quality audio by using a macro diversity technique in units of MBS zones. In order to provide such MBS zone-based broadcasting service, the IEEE 802.16 standard refers to MBS Zone Identifier (MBS Zone ID) and Multicast Connection ID (MCID). It is specified.

The size of the MBS zone ID is 8 bits, limited to a maximum of 128 MBS zones, the size of the MCID is 12 bits, represented by 0xFEA0-0xFEFE, and limited to a maximum of 94 MCIDs. One MBS zone is a group composed of several base stations, and one MCID is a unique corresponding value for each broadcast channel in the MBS zone. If the MBS zone is different, the MCID is not unique. That is, when the MBS zones are different, different broadcast channels may have the same MCID, and the same broadcast channel may have different MCIDs.

However, in the MBS service method, the switching time between broadcast channels due to the change of the broadcast channel is changed due to the limitation of time, space and broadcast channel through MCID and MBS zone ID, and limitation of available MCID and MBS zone ID values. Due to the difficulty of continuous service maintenance due to delay and handover between base stations, there are many limitations in providing an appropriate channel switching time and seamless broadcast service to subscribers moving over a large area.

Accordingly, in order to support a successful mobile broadcast service, a method capable of simultaneously providing a seamless broadcast service and an appropriate channel switching time to a subscriber moving over a large area and an apparatus for performing such a method are needed.

Accordingly, the present invention provides an apparatus and method for allocating a multicast connection identifier to a user using a multicast and broadcast service (MBS) mode in a wireless access system.

In addition, the present invention provides an apparatus and method for allocating a predetermined MCID according to the type of data when requesting MBS service in a wireless access system, and assigning a multicast connection identifier for fixing the allocated MCID to the same value in the entire broadcasting area. do.

In order to solve the above objects, an apparatus for allocating a multicast connection identifier in a wireless access system according to an embodiment of the present invention exchanges data with a content distribution network in which a server providing a broadcast service is located, and header information of the data. A first transmitting / receiving unit extracting the; An assembly unit configured to configure the data in units of frames according to a data transfer standard of a wireless section; A second transmitter / receiver for exchanging the frame with the terminal receiving the assembled frame and receiving an MBS channel connection request message from the radio section; 1 analyzing unit for extracting the attribute information of the data by analyzing the extracted header information, and analyzes the type of the data using the extracted attribute information; A second analyzer extracting channel information by analyzing the MBS channel connection request message; And exchanging an MBS burst reservation message with the content distribution network, reserving and allocating an MBS burst area using the MBS burst reservation message and the channel information, assigning an MCID to the data, and an MBS channel corresponding to the MCID. It includes a control unit for managing the registration state of the.

An apparatus for allocating a multicast connection identifier in a wireless access system according to an embodiment of the present invention includes an application program execution unit for requesting or terminating a service under the control of a subscriber and providing a result of the service to the subscriber; A request analyzer which classifies the requested service as an MBS service or a unicast service, determines whether the service request is an initial request, and generates and delivers a buffer allocation policy according to the determination; A buffer controller which allocates or releases a buffer according to the buffer allocation policy and manages the allocated buffer space; A frame transmitter configured to configure a frame for transmitting information and to transmit the configured frame in a wireless section according to a transmission characteristic of a physical layer; A frame receiving unit which receives a packet transmitted through a wireless access network through a physical layer and decodes the received signal; A frame classifier configured to classify the information included in the received frame into packet units and transmit the information included in the received frame to a predetermined buffer space by using the wireless segment connection identifier included in the decoded frame; And a frame buffer that stores data classified in packet units according to the type of data.

In a wireless access system according to an embodiment of the present invention, a method for allocating a multicast connection identifier includes selecting an MBS channel and performing a buffer allocation policy; Allocating buffer space corresponding to a predetermined size for each type of data according to the buffer allocation policy; Assigning an MCID value to the data according to a connection request of the MBS channel; Receiving a frame having an MBS burst region corresponding to the MCID, classifying and extracting data of the MBS burst region corresponding to the MCID; Storing the extracted data in a buffer area corresponding to the MCID of the extracted data; And providing the service by identifying the MBS channel using the multicast IP address information included in the IP header of the data stored in the buffer area.

According to the present invention, a multicast connection identifier can be assigned to a user using a multicast and broadcast service (MBS) mode in a wireless access system. In addition, the present invention according to the handover of the terminal to move between the base station apparatus by allocating a predetermined MCID according to the type of data when the MBS service request in the wireless access system, and fixing the assigned MCID to the same value in the entire broadcast area It is possible to solve the service interruption and to shorten the switching time between broadcast channels.

1 is a general conceptual diagram showing the configuration of a device component and network for providing MBS,
2 is a configuration diagram of a base station of a wireless access system according to an embodiment of the present invention;
3 is a block diagram of a terminal of a wireless access system according to an embodiment of the present invention;
4 is a diagram illustrating a multicast connection identifier allocation process in a wireless access system according to an embodiment of the present invention.

In the following description, well-known functions or constructions are not described in detail since they would obscure the invention in unnecessary detail. Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. Next, a configuration of an apparatus component and a network for providing an MBS will be described in more detail with reference to FIG. 1.

Figure 1 is a general dog showing the device components and network configuration for providing MBS

It's a concept.

Referring to FIG. 1, a wireless access system according to an embodiment of the present invention includes a content distribution network 100, an ASN 110, a base station 130, and a terminal 150. The content distribution network 100 includes an MBS server 170. In the present invention, the MPEG2-TS data is IP packetized and transferred through a predetermined path between the MBS server 170 and the terminal 150, and the wireless access procedure between the terminal 150 and the base station 130 is an 802.16 series broadband. It will be described on the assumption that it follows the standard of the radio access system.

When the user selects the MBS channel by using the terminal 150, the terminal 150 transmits an MBS channel connection request message to the base station 130. Here, the terminal 150 is connected to a wireless access network to transmit / receive a variety of data, and processes the transmitted / received data. The base station 130 manages radio resource control and data channels to support the macro diversity function.

Then, the base station 130 transmits an MBS channel connection request message to the MBS server 170. The MBS server 170 includes channel or program information that is a combination of content ID, program ID, IP multicast address, MBS zone ID, and MCID, and manages IP multicast group, program management, service guide notification and distribution, and session. Manage management, data encryption and keys.

The MBS server 170 performs subscriber authentication and service authentication using the MBS channel connection request message requested by the terminal 150. If the authentication is successful, various information such as a user ID, a program ID, and a decryption key necessary for using the requested MBS channel are transmitted to the terminal 150 as a response message for the MBS channel connection request. The MBS server 170 notifies the ASN 110 of the start of the MBS channel service.

The ASN device 110 performs functions such as channel establishment, session management, synchronization control, data path establishment and release, etc. under the control of the MBS server. That is, when the ASN device 110 receives a message indicating the start of the MBS channel service from the MBS server 170, the ASN device 110 transmits a reservation message requesting a reservation for the MBS burst area to the base station 130.

Then, the base station 130 receives the reservation message from the MBS server 170, and transmits a response message to the reservation message to the ASN (110). In addition, the MBS server 170 and the ASN 110 perform a path setting for transmitting MBS channel data between the MBS server 170 and the ASN 110 according to a predetermined procedure.

When the MBS server 170 finishes setting the path for transmitting MBS channel data, the MBS server 170 converts the data of the MPEG2-TS type requested by the user through the terminal 150 into an IP packet and sets the path. It transmits to the base station 130 through.

 The base station 130 configures an MBS burst region including an MCID corresponding to an attribute of an input packet using packet attribute information obtained by analyzing an IP packet and MCID / MBS burst region information. In addition, the base station 130 forms a complete frame by combining the MBS burst area and the data areas for the unicast type service, and transmits the configured frame to the terminal 150.

The terminal 150 may provide a service for a specific MBS channel by identifying the MBS channel requested by the user through the multicast IP address information included in the IP header of the packet. Here, each channel is distinguished using different multicast IP addresses. The terminal 150 receives the channel information on the broadcast channel periodically or aperiodically from the MBS server 170, and the service connection request and release for the broadcast channel is performed through IGMP join and leave messages.

Information on the broadcast channel is program ID, multicast IP address, MBS zone

ID and the like. The service connection request and release message are performed through a point-to-point connection between the terminal 150 and the base station 130. The broadcast contents are divided into MBS type service which is a broadcast service provided in real time and unicast type service which is a broadcast service provided in a form such as VoD. The broadcast service information is included in broadcast channel information.

MBS type broadcast content has a point-to-multipoint connection between the device and the subscriber terminal 150 and unicast type broadcast content is a point-to-point connection between the base station 130 and the subscriber terminal 150. has a point-to-point connection. Next, the components of the terminal 150 of the wireless access system according to the embodiment of the present invention will be described in more detail with reference to FIG. 2.

2 is a block diagram of a terminal 150 of a wireless access system according to an embodiment of the present invention.

Referring to FIG. 2, the terminal 150 of the wireless access system according to the present invention includes a buffer controller 257, a request analyzer 259, an application program execution unit 261, a frame transmitter 263, and a frame. The receiver 251, the frame classifier 253, and the frame buffer 255 are included. The user receives channel information on channels that can be viewed through an application program operated by the application program execution unit 261, for example, an electronic program guide (EPG), from the MBS server 170. Here, the channel information for the channels include a program ID, a multicast IP address, and an MBS zone ID.

The user selects the MBS channel through the application program running in the application program execution unit 261 of the terminal 150, the terminal 150 generates the MBS channel selection signal or MBS channel termination signal according to the user's selection . The request analyzer 259 receives an MBS channel selection signal from the application execution unit 261, and determines whether the connection to the requested MBS channel is the first connection request using the received MBS channel selection signal. Check through the setting status of.

If it is determined that the user accesses the MBS zone for the first time as a result of checking the MBS flag, the request analyzer 259 performs a buffer allocation policy, and the buffer controller 257 buffers each MCID according to the buffer allocation policy. Allocate Here, if it is determined that the user has reconnected to the same MBS zone as a result of checking the MBS flag, the above process is omitted.

In more detail, the request analyzer 259 determines whether the user is a first-time user or a re-accessed user of the MBS zone according to the state of the MBS flag. If it is determined that the user accesses the MBS zone for the first time, the request analyzer 259 performs a buffer allocation policy. The buffer allocation policy configures MPEG2-TS data for a MBS type service. A policy is used to allocate independent buffers for each property such as video data, audio data, and text data. The buffer allocation policy includes information such as the type of buffer, the size of each buffer, and the MCID corresponding to each buffer.

The buffer controller 257 receives a buffer allocation policy from the request analyzer 259, and a buffer having a predetermined size for each of video data, audio data, and text data in the frame buffer 255 according to the received buffer allocation policy. The space is allocated, and the address information allocated for each type of the buffer is transmitted to the frame classifier 253 and the application program execution unit 261. The buffer allocation result is then sent to the request analyzer 259.

That is, if it is determined that the user is the first accessor of the MBS zone as a result of checking the MBS flag, and it is determined that the buffer is normally allocated based on the result of the buffer allocation received from the buffer control unit 257, the request analyzer 259 determines that the MBS flag has been assigned. The flag setting state is modified to a value indicating that the request is not the first request. The application execution unit 261 generates an MBS channel connection request message for the broadcast channel selected by the user, and transmits the message to the frame transmitter 263.

When the user accesses the same MBS zone again, the application program execution unit 261 does not perform a process of allocating a buffer for each MCID according to the buffer allocation policy and the buffer allocation policy, and the application program execution unit 261 performs the MBS for the broadcast channel selected by the user. A channel connection request message is generated and transmitted to the frame transmitter 263.

The frame receiving unit 251 receives an MBS channel connection request response message, which is a response message to the MBS channel connection request message, from the MBS server 170 and transmits the received message to the frame classifier 253. In this case, the MBS channel connection request response message includes information necessary for normal use of the channel selected by the user, such as a user ID, a program ID, and a decryption key for recovering encrypted content.

The frame classifier 253 stores the MBS channel connection request response message transmitted from the MBS server 170 in a buffer for unicast data. The application execution unit 261 reads the channel connection request response message stored in the unicast data through the associated program.

Here, the related program located in the application program execution unit 261 performs preliminary procedures for processing MBS channel data. If the frame classifier 253 receives the MCID allocation notification message from the base station 130 of FIG. 3 to be described later, extracts and records MCID values included in the received message, and responds to the MCID allocation notification. It generates and transmits to the base station 130 of FIG.

The MCID assignment notification message includes an MCID value according to attributes of video data, audio data, and text data of MBS channel data. Here, the process of transmitting the MCID allocation notification message and the response message for the MCID allocation notification between the terminal 150 and the base station 130 of FIG. 3 to be described later is a DSA (Dynamic Service) defined in the 802.16 series broadband wireless access system. Follow the Addition procedure.

In the DSA procedure, when the base station 130 transmits a DSA request message (DSA-REQ) to the terminal 150, the terminal 150 transmits a DSA response message (DSA-RSP) to the base station 130. The base station 130 is a procedure for transmitting a DSA acknowledgment message (DSA-ACK) for the DSA response message to the terminal 150 again.

When the frame classifier 253 receives a frame having an MBS burst region corresponding to a predetermined MCID, the frame classifier 253 classifies and extracts data of MBS burst regions corresponding to each predetermined MCID. . The frame classifier 253 stores the extracted data in a buffer corresponding to each of the predetermined MCIDs.

The application execution unit 261 receives the data stored in each buffer area classified into video data, audio data, and text data using an image player or an audio player. Thereafter, the application execution unit 261 may provide the service for the specific MBS channel by identifying the MBS channel requested by the user through the multicast IP address information included in the IP header of the packet. Next, the components of the base station 130 of the wireless access system according to the embodiment of the present invention will be described in more detail with reference to FIG. 3.

3 is a diagram schematically illustrating components of a base station 150 of a wireless access system according to an exemplary embodiment of the present invention.

Referring to FIG. 3, the base station 150 includes a first transmitter / receiver 231, an assembly unit 233, a second transmitter / receiver 235, a first analyzer 237, a controller 239, and a first receiver. 2 includes an analysis unit 241. The second transmitter / receiver 235 receives the MBS channel connection request message from the frame transmitter 263 of the terminal 150 and transmits the received MBS channel connection request message to the second analyzer 241.

The second analyzer 241 analyzes the MBS channel connection request message received from the second transmitter / receiver 235 to determine whether the user connects to the ID or CID of the user who sent the MBS channel connection request message, or whether the MBS type service connection is requested. Attribute information such as ID, broadcast channel multicast IP address, etc. is extracted. The second analyzer 241 transmits the extracted attribute information to the controller 239.

Here, whether to request a connection for the MBS type service may be determined based on the type and content of the received message. If the received MBS channel connection request message is an IGMP join message, it may be determined as a connection request for a service of MBS type. In addition, when the received MBS channel connection request message is an IGMP leave message, it may be determined as a connection release request for a subscribed MBS type service. In addition, a separate dedicated message may be used for this purpose.

The controller 239 receives attribute information from the second analyzer 241 and searches the MCID table using the received attribute information. According to the search result, it is determined whether to register the identification information of the user who transmitted the MBS channel connection request message, for example, the user ID or the CID. Here, the MCID table records user identification information using an MCID, a multicast IP address, a program ID, and the like, which are information on a broadcasting channel being serviced through the MCID.

If the identification information of the user who sent the MBS channel connection request message is not registered in the MCID table, that is, if the user is the first access user of the MBS zone, the predetermined MCID value is determined according to the video, audio, and text properties of the MPEG2-TS data. Transmission to the terminal 150 of FIG. The controller 239 transmits an MBS channel connection request message to the MBS server 170 through the packet transmitter / receiver 231.

If the identification information of the user who sent the MBS channel connection request message is already registered in the MCID table, that is, when the user accesses the same MBS zone again, the controller 239 transmits the packet without the above process. The MBS channel connection request message is transmitted to the MBS server 170 through the receiver 231.

Next, the controller 239 transmits MCID / MBS burst allocation information to the assembly unit 233, and transmits an MBS channel connection request message to the ASN 110. Thereafter, the ASN 110 transmits an MBS channel connection request message to the MBS server 170. The MBS server 170 performs subscriber authentication and service authentication for the MBS channel connection request requested by the terminal 130. If the authentication is successful, the ASN 110 transmits a response message to the MBS channel connection request back to the terminal 150 of FIG. 2.

The MBS server 170 transmits a start message indicating the start of the MBS channel service to the ASN 110. When the ASN 110 receives the start message from the MBS server 170, the ASN 110 transmits a reservation message to the base station 130 to request a reservation for the MBS burst area.

The controller 239 of the base station 130 receives a reservation message from the ASN 110, and the controller 239 reserves a burst area corresponding to each MCID recorded in the MCID table. Thereafter, the controller 239 transmits a response message to the ASN 110 in response to the reservation request of the MBS burst area. The base station 130 performs a path setting for transferring MBS channel data between the MBS server 170 and the ASN 110 and between the base station 130 and the ASN 110 according to a predetermined method.

After the reservation of the MBS burst and the path setting for the MBS channel data are completed normally, it is determined whether the user is the first accessor of the MBS zone. As a result of the determination, if the user first accesses the MBS zone, the controller 239 transmits an MCID allocation notification message to the terminal 150 of FIG. 2. As a result of the determination, when the user reconnects to the same MBS zone, the control unit 239 skips the above-described process and extracts the attribute information obtained through the path setting, for example, user identification information, program ID, multicast IP address, and the like. Update the table.

The MCID allocation notification message for each MBS channel data attribute includes an MCID value according to video, audio, and text attributes of MBS channel data. After the path setting is completed, the MBS server 170 converts the MPEG2-TS data requested by the user through the terminal 150 of FIG. 2 into IP packetized data, and converts the converted IP packet data. The ASN 110 transmits to the first transmitter / receiver 231 of the terminal 150. The first transmitter / receiver 231 extracts header information of the IP packetized MPEG2-TS data.

The first transmitter / receiver 231 transmits the extracted header information to the first analyzer 237. The first analyzer 237 extracts an IP address or a destination IP address of the received packet by analyzing the extracted header information. The first analyzer 237 distinguishes between MBS data and unicast data using the IP address or the destination IP address.

In particular, when the extracted IP address includes the multicast IP address for the MBS channel, it is determined that the received packet includes data on the MBS type of service. Therefore, in this case, the first analyzer 237 classifies the attributes of the received packet into video, audio, or text once again using multimedia attributes, and transmits the analyzed information to the assembly unit 233.

The assembling unit 233 uses the attribute information of the packet received from the first analysis unit 237 and the MCID corresponding to the attribute of the input packet by using the MCID / MBS burst allocation information received from the control unit 239. After configuring the burst area, it combines with the data areas for unicast type services to form a complete frame. The assembling unit 233 transmits the configured frame to the second transmitting / receiving unit 235.

The second transmitter / receiver 235 outputs a frame data including an MBS burst region modulated according to a physical layer standard to a wireless section. The frame receiver 251 of the terminal 150 receives a frame from the second transmitter / receiver 235 of the base station 130 and transmits the frame to the classifier 253. When the frame is a frame having an MBS burst region corresponding to a preset MCID, the classifier 253 classifies and extracts the frame into data of an MBS burst region corresponding to the preset MCID.

Next, the process of assigning a multicast connection identifier in a wireless access system according to an embodiment of the present invention will be described in more detail with reference to FIG. 4.

4 is a diagram illustrating a multicast connection identifier allocation process in a wireless access system according to an embodiment of the present invention.

Referring to FIG. 4, in operation 301, a user may obtain channel information on channels that can be viewed through an application program operated by the application execution unit 261, for example, an EPG (Electronic Program Guide) from the MBS server 170. Receive. Here, the channel information for the channels include a program ID, a multicast IP address, and an MBS zone ID.

In step 303, the user selects the MBS channel through the application program, the MBS server 170 generates an MBS channel selection signal or MBS channel termination signal. The request analyzer 259 receives the MBS channel selection signal from the application execution unit 261 in step 307 and determines whether the connection to the requested MBS channel is the first connection request using the received MBS channel selection signal. Check the status of the MBS flag. If the channel selection signal being processed is the first connection request for the MBS channel, the request analyzer 259 performs a buffer allocation policy in step 309.

Here, the buffer allocation policy is a policy used to allocate an independent buffer for each property such as video data, audio data, and text data constituting MPEG2-TS data for a MBS type service. The buffer allocation policy includes information such as the type of buffer, the size of each buffer, and the MCID corresponding to each buffer.

The buffer control unit 257 receives a buffer allocation policy from the request analyzer 259 in step 311, and predetermines the video data, the audio data, and the text data in the frame buffer 255 according to the received buffer allocation policy. Allocate buffer space of size. The address information allocated for each type of the buffer is transmitted to the frame classifier 253 and the application program execution unit 261. The buffer allocation result is then sent to the request analyzer 259.

That is, the request analyzer 259 is the first connection to the requested MBS channel using the MBS channel selection signal received from the application program execution unit 261, and the buffer allocation received from the buffer controller 257. If it is determined that the buffer is normally allocated based on the result of the request, the request analyzer 259 modifies the setting state of the MBS flag to a value indicating that it is not the first request. When the same user requests service connection for the MBS channel, steps 309 and 311 are not executed.

The application program execution unit 261 generates an MBS channel connection request message for the broadcast channel selected by the user in step 313 and transmits the message to the frame transmitter 263. Here, the frame transmitter 263 configures data to be transmitted to the base station 130, for example, an MBS channel connection request message generated by the application program execution unit 261, according to a characteristic of the physical layer and a designated structure. The frame transmitter 263 transmits the frame configured according to the radio resource access control of the base station 130 to the base station 130.

Here, the MBS channel connection request message may be transmitted to the base station 130 between steps 301 and 305. In step 331, the second transmitter / receiver 235 of the base station 130 receives the MBS channel connection request message from the frame transmitter 263 of the terminal 150 and transmits it to the second analyzer 241. The analyzer 241 analyzes the MBS channel connection request message received from the second transmitter / receiver 235. The second transmitter / receiver 235 extracts channel information such as an ID or CID of the user who sent the MBS channel connection request message, whether to request a service connection in the MBS form, a program ID, a multicast IP address of a broadcast channel, and the like. . The second analyzer 241 transmits the extracted channel information to the controller 239.

Here, whether to request a connection for the MBS type service may be determined based on the type and content of the received message. If the received MBS channel connection request message is an IGMP join message, it may be determined as a connection request for a service of MBS type. In addition, when the received MBS channel connection request message is an IGMP leave message, it may be determined as a connection release request for a subscribed MBS type service. In addition, a separate dedicated message may be used for this purpose.

In step 333, the controller 239 receives channel information from the second analyzer 241 and searches the MCID table using the received channel information. According to the search result, it is determined whether to register the identification information of the user who transmitted the MBS channel connection request message, for example, the user ID or the CID. Here, the MCID table records user identification information using an MCID, a multicast IP address, a program ID, and the like, which are information on a broadcasting channel being serviced through the MCID.

If the identification information of the user who sent the MBS channel connection request message has already been registered in the MCID table, no separate MCID value is transmitted to the user terminal 150. If the request is related to the initial request, video of MPEG2-TS data is transmitted. In accordance with the audio and text attributes, the predetermined MCID value is transmitted to the subscriber terminal 150. In this case, when the same user requests service connection for the MBS channel, the predetermined MCID value is not transmitted to the subscriber station 150.

Next, the control unit 239 transmits the MCID / MBS burst allocation information to the assembly unit 233 in step 335, and transmits an MBS channel connection request message to the ASN 110. Thereafter, the ASN 110 transmits an MBS channel connection request message to the MBS server 170. The MBS server 170 performs subscriber authentication and service authentication for the MBS channel connection request requested by the terminal 130 in step 391.

If the authentication is successful, the ASN 110 transmits a response message to the MBS channel connection request back to the terminal 130 in step 393. In this case, the response message includes various information such as a user ID, a program ID, and a decryption key required for using the requested MBS channel. The frame receiver 251 of the terminal 130 receives a response message from the ASN 110, and the frame receiver 251 transmits the response message to the classifier 253.

The classifier 253 stores a response message for the MBS channel connection request in a buffer for unicast data. The application program execution unit 261 executes a channel connection request response message stored in a buffer for unicast data through a related program. The application program execution unit 261 performs preliminary procedures for processing MBS channel data transmitted later by using information included in the response message to the MBS channel connection request, for example, a user ID, a program ID, a decryption key, and the like.

In operation 395, the MBS server 170 transmits a start message indicating the start of the MBS channel service to the ASN 110. When the ASN 110 receives the start message from the MBS server 170, the ASN 110 transmits a reservation message to the base station 130 to request a reservation for the MBS burst area.

The control unit 239 of the base station 130 receives a reservation message from the ASN 110 in step 371, and the control unit 239 reserves a burst area corresponding to each MCID recorded in the MCID table in step 337. . Thereafter, the controller 239 transmits a response message to the ASN 110 in response to the reservation request of the MBS burst region in step 339. In step 341, the base station 130 performs routing for transferring MBS channel data between the MBS server 170 and the ASN 110 and between the base station 130 and the ASN 110 according to a predetermined method. .

After the reservation of the MBS burst and the path setting for the MBS channel data are normally completed, the base station 130 determines whether the connection to the requested MBS channel is the first connection request using the MBS channel selection signal in step 343. . If the connection to the MBS channel is the first connection as a result of the determination, in step 345, the base station 130 transmits an MCID allocation notification message for each MBS channel data attribute to the terminal 150. Here, the MCID allocation notification message for each MBS channel data property includes an MCID value according to video, audio, and text property of MBS channel data.

The frame receiving unit 251 of the terminal 150 receives an MCID allocation notification message for each MBS channel data attribute from the base station 130 and transmits it to the classification unit 253. The classifier 253 extracts and records MCID values included in the MCID allocation notification message for each MBS channel data attribute. Thereafter, the frame receiving unit 251 of the terminal 150 generates a response message to the MCID allocation notification in step 315 and transmits it to the base station 130.

If the connection to the requested MBS channel by using the MBS channel selection signal was not the first connection request, without performing the step 345 of the base station 130, in step 347, attribute information such as user identification information, Update the program ID, multicast IP address, etc. in the MCID table.

Here, the process of transmitting the MCID allocation notification message and the response message for the MCID allocation notification between the terminal 150 and the base station 130 is a DSA (Dynamic Service Addition) procedure defined in the 802.16 series broadband wireless access system Follow. In the DSA procedure, when the base station 130 transmits a DSA request message (DSA-REQ) to the terminal 150, the terminal 150 transmits a DSA response message (DSA-RSP) to the base station 130. The base station 130 again operates as a procedure for transmitting a DSA acknowledgment message (DSA-ACK) for the DSA response message to the terminal 150.

After the path setting is completed, the MBS server 170 converts the MPEG2-TS data requested by the user through the terminal 150 into IP packetized data in step 397, and converts the data in the form of the converted IP packet. The ASN 110 transmits to the first transmitter / receiver 231 of the terminal 150. The first transmitter / receiver 231 extracts header information of the IP packetized MPEG2-TS data.

The first transmitter / receiver 231 transmits the extracted header information to the first analyzer 237. The first analyzer 237 extracts an IP address or a destination IP address of the received packet by analyzing the extracted header information. In operation 349, the first analyzer 237 distinguishes between MBS data and unicast data using the IP address or the destination IP address.

In particular, when the extracted IP address includes the multicast IP address for the MBS channel, it is determined that the received packet includes data on the MBS type of service. Therefore, in this case, the first analyzer 237 classifies the attribute of the received packet into video, audio, or text once more, and transmits the analyzed information to the assembly unit 233.

The assembly unit 233 uses the attribute information of the packet received from the first analyzer 237 and the MCID / MBS burst allocation information received from the control unit 239 in step 351 to determine the MCID corresponding to the attribute of the input packet. After configuring the containing MBS burst area, combined with the data areas for the unicast service forms a complete frame. The assembling unit 233 transmits the configured frame to the second transmitting / receiving unit 235.

In operation 353, the second transmitter / receiver 235 outputs the frame data including the MBS burst region modulated according to the physical layer standard to the wireless section. The frame receiver 251 of the terminal 150 receives a frame from the second transmitter / receiver 235 of the base station 130 and transmits the frame to the classifier 253. In step 317, when the frame is a frame having an MBS burst area corresponding to the preset MCID, the classifier 253 classifies and extracts the frame into data of the MBS burst area corresponding to the preset MCID.

In step 319, the classifier 253 records the extracted data in a buffer space having a predetermined size for each of video data, audio data, and text data in the frame buffer 255 according to the buffer allocation policy. The application program execution unit 261 receives data stored in each buffer area classified into video data, audio data, and text data using an image player or an audio player.

Thereafter, the application program execution unit 261 may provide a service for a specific MBS channel by identifying the MBS channel requested by the subscriber through the multicast IP address information included in the IP header of the packet in step 321.

The present invention has been described above with reference to preferred embodiments thereof. Those skilled in the art will appreciate that the present invention can be implemented in a modified form without departing from the essential features of the present invention. The disclosed embodiments should, therefore, be considered in an illustrative rather than a restrictive sense. The scope of the present invention is shown in the claims rather than the foregoing description, and all differences within the scope will be construed as being included in the present invention.

100: content distribution network, 110: ASN
130: base station, 150: terminal
231: first transmitting / receiving unit 233: assembly unit
235: second transmitter / receiver 237: first analyzer
239: control unit 241: second analysis unit
251: frame receiving unit 253: frame classification unit
255: frame buffer 257: buffer control unit 259: request analysis unit 261: application program execution unit 263: frame transmission unit

Claims (20)

An apparatus for allocating a multicast connection identifier in a wireless access system,
A first transmitter / receiver for exchanging data with a content distribution network in which a server providing a broadcast service to a subscriber is located and extracting header information of the data;
A first analyzing unit configured to extract the attribute information of the data by analyzing the extracted header information and to analyze the type of the data using the extracted attribute information;
An assembly unit configured to configure the data in units of frames according to a data transfer standard of a wireless section;
A second transmitter / receiver for exchanging the frame with the terminal receiving the assembled frame and receiving an MBS channel connection request message from the radio section;
A second analyzer configured to extract the channel information by analyzing the MBS channel connection request message; And
Exchanging an MBS burst reservation message with the content distribution network, reserving and allocating an MBS burst area using the MBS burst reservation message and the extracted channel information, assigning an MCID to the data, and an MBS corresponding to the MCID. Including a control unit for managing the registration status of the channel,
The MCID is a predetermined value according to an attribute of data constituting a broadcast channel requested by the subscriber, and the MCID is fixed to the same value for the entire broadcast area. The method of claim 1, wherein the first analysis unit,
And when the data is MBS data, classify the data into video data, audio data, or text data using multimedia information.
The apparatus of claim 1,
And an MCID table for storing an assigned MCID, a user ID, and a multicast IP address for the requested broadcast channel according to the attribute of the data.
The apparatus of claim 3,
And a base station that reserves the MBS burst area corresponding to each MCID recorded in the MCID table when the user's connection using the terminal is the first connection.
The apparatus of claim 3,
And when the connection of the user who uses the terminal is not the first connection, updating the attribute information in the MCID table. The method of claim 1, wherein the assembly unit,
And configuring the MBS burst area corresponding to the data by using the attribute information and the allocation information of the MBS burst, and assembling a frame by combining the configured MBS burst area and the unicast area.
The method of claim 1, wherein the attribute information,
And an IP address of the data, a destination IP address.
The method of claim 1, wherein the channel information,
A base station including the ID or CID of the user who sent the MBS channel connection request message, whether to request a service connection in the form of MBS, a program ID, and a multicast IP address of a broadcast channel.
The method of claim 1, wherein the allocation notification message,
A base station comprising the MCID value according to the video, audio, text attributes of the MBS channel data. delete delete The method of claim 1, wherein the type of data is
A base station comprising video data, audio data, and text data.
An apparatus for allocating a multicast connection identifier in a wireless access system,
An application program execution unit requesting or terminating a service under the control of the subscriber and providing a result of the service to the subscriber;
A request analyzer which classifies the requested service as an MBS service or a unicast service, determines whether the service request is an initial request, and generates and delivers a buffer allocation policy according to the determination;
A buffer control unit for allocating or releasing a buffer space according to the buffer allocation policy and managing the allocated buffer space;
A frame transmitter configured to configure a frame for transmitting information and to transmit the configured frame in a wireless section according to a transmission characteristic of a physical layer;
A frame receiving unit which receives a packet transmitted through a wireless access network through a physical layer and decodes the received frame;
A frame classifying unit classifying the information included in the received frame by the packet unit using the MCID included in the decoded frame and delivering the information to the buffer space; And
Including a frame buffer for storing data classified by packet unit according to the property of the data,
The MCID is a predetermined value according to an attribute of data constituting a broadcast channel requested by the subscriber, and the MCID is fixed to the same value for the entire broadcast area.
The method of claim 13, wherein the frame classification unit,
Receiving the MCID assigned according to the attribute of the data when requesting an MBS service, the terminal.
The method of claim 13, wherein the attribute of the data,
A terminal comprising video data, audio data, and text data.
The method of claim 13, wherein the buffer allocation policy,
And a policy used to allocate an independent buffer according to the attribute of the data.
In the method of allocating a multicast connection identifier in a wireless access system,
At the subscriber's request, the terminal selecting the MBS channel and performing a buffer allocation policy;
Allocating, by the terminal, buffer space of a predetermined size for each attribute of data according to the buffer allocation policy;
As the terminal requests a base station to connect the MBS channel, assigning an MCID value to the data;
Receiving, by the terminal, a frame having an MBS burst region corresponding to the assigned MCID, classifying and extracting data of the MBS burst region corresponding to the MCID by attributes;
Storing, by the terminal, the extracted data in a buffer space corresponding to the MCID of the extracted data; And
Providing the service by identifying the MBS channel by using the multicast IP address information included in the IP header of the extracted data stored in the buffer space.
The MCID is a predetermined value according to the property of the data constituting the broadcast channel requested by the subscriber, the MCID is fixed to the same value for the entire broadcast area, multicast connection identifier allocation method.
The method of claim 17, wherein the buffer allocation policy,
And a policy used for allocating an independent buffer in accordance with the attribute of the data.
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