CN100442699C - A method and system for discovering OMA BCAST business guidelines - Google Patents

Abstract

The invention discloses a method and system for discovering the OMA BCAST service guide, so as to solve the problem in the prior art that the terminal can only passively accept relevant content. The method includes: A, mapping the distribution SGDD file session to the first BCMCS program, and assigning the first BCMCS program identifier; mapping the distribution SGDU file session to the second BCMCS program, and assigning the second BCMCS program identifier; B, The terminal initiates a session discovery request to the BCMCS adapter via the BSN, and the session discovery request carries the first BCMCS program identifier and/or the second BCMCS program identifier; C. The BCMCS adapter according to the first BCMCS program identifier and/or the second BCMCS program identifier, and send the file session to the terminal. The invention also discloses a system for discovering the OMABCAST service guide. The adoption of the solution of the invention enables the terminal of the BCAST service subscriber to actively discover and receive the BCAST service guide in the BCMCS network.

Description

A method and system for discovering OMA BCAST business guidelines

technical field

The present invention relates to the communication field, in particular to a method and system for discovering an Open Mobile Alliance Broadcast (OMA BCAST, Open Mobile Alliance Broadcast) service guide in a Broadcast Multicast Service (BCMCS, BroadCastMultiCast Service) network.

Background technique

At present, the mainstream technologies for providing mobile video broadcasting are as follows: Multimedia Broadcast Multicast Service (MBMS, Multimedia Broadcast Multicast Service), Broadcast Multicast Service (BCMCS, BroadCast MultiCast Service) and Handheld Digital TV Broadcasting (DVB-H, Digital VideoBroadcast -Handset), in order to provide a unified service platform, the Open Mobile Alliance (OMA, Open Mobile Alliance) proposed a new mobile multimedia architecture broadcast (BCAST, Broadcast).

The BCAST architecture is shown in Figure 1, where the dark boxes are the functional entities of the system; the dark lines are the message channels in the system; other entities and lines only belong to the relevant systems or devices of the system, and the dotted boxes The functional entity of is an optional entity.

The dotted frame in the BCAST architecture is a specific broadcast bearer network and interactive network, which can be a BCMCS network or a Multimedia Broadcast Multicast Service (MBMS) network.

The functions of each functional entity of the BCAST system are described as follows:

The mobile video broadcasting service must provide users with a service guide, which includes a brief introduction to each service (maybe a certain TV channel), and the corresponding multicast session information of the service (specifically, the purpose of transmitting program streams) Multicast IP address and port number, source IP address, and possibly a session identifier), so that the terminal can request to watch programs based on the information provided by the service guide.

In BCAST, a service guide contains many service guide fragments, and one or more service guide fragments are encapsulated into a service guide delivery unit (SGDU, Service Guide Delivery Unit), and each SGDU is broadcast in the form of a file The network or interactive channel is distributed to the terminal, and the Service Guide Delivery Descriptor (SGDD, Service Guide Delivery Descriptor) describes the multicast session information corresponding to the file distribution session that sends the SGDU (as mentioned above, it should include the destination multicast IP Address and port number, source IP address, session identifier), where each SGDD may describe the file distribution sessions corresponding to multiple SGDUs, and SGDD is also distributed to terminals in the form of files.

In BCMCS, services are provided to users in the form of broadcast multicast service programs (BCMCS Program), and each BCMCS program can contain multiple broadcast multicast service flows (BCMCS Flow(s)). For example, it can be assumed that CCTV corresponds to A BCMCS program, and the audio and video streams of the channel program correspond to a BCMCS stream respectively. Each BCMCS program and BCMCS stream has a unique identifier, which are BCMCS program identifier and BCMCS stream identifier respectively. Users can use the BCMCS program identifier character or BCMCS stream identifier to request a specific program from the network. A program usually includes multiple streams. If you use the BCMCS program identifier to request a program, you should receive multiple broadcast streams (for example, a complete set of programs may have video streams, Chinese audio streams and English audio streams, or even Subtitle stream, use BCMCS stream identifier to request program, then just request to receive certain specific stream (such as being specific to the audio stream of Chinese or English).The structure of BCMCS program identifier and BCMCS stream identifier is as shown in Figure 2, The total length of the BCMCS flow identifier can be 8 bits, 16 bits or 24 bits. It is mainly composed of 3 parts, the highest 3 bits are used to identify the length of the flow discriminator (Flow Discriminator), followed by the BCMCS program identifier, flow discriminator Among them, the BCMCS program identifier uniquely identifies a BCMCS program, and the stream discriminator uniquely identifies a stream in a specified program, so the BCMCS program identifier and the stream discriminator together form a BCMCS stream identifier, which can globally identify a Stream. The BCMCS Program Identifier can be a 6- to 29-bit binary number.

In BCAST, SGDD describes the relevant information of the file multicast session for distributing service guides, so it can be regarded as the entry point of service guide distribution. If a terminal wants to obtain service guides, it must first receive SGDD. Regardless of whether it is SGDD or the real service guide, it is ultimately transmitted to the terminal by the underlying bearer network in the form of a file through the air interface. Therefore, in the case of using the broadcast channel to distribute them to the terminal, a problem that must be solved is How to help the terminal finally discover and receive SGDD on the air interface, and then discover and receive SGDU, so as to obtain a complete service guide. In the existing solutions, only the formats of SGDD and SGDU are defined, and they are required to be transmitted by broadcast. However, a problem that must be faced when broadcasting using the air interface is how the terminal equipment finds the broadcast. The usual way is to constantly adjust the frequency point to Try receiving until you receive what the user wants. This solution obviously has a lot of disadvantages. It needs to adjust the frequency point continuously to try to receive, and the terminal can only passively accept the relevant content.

Contents of the invention

The present invention provides a method and system for discovering OMA BCAST service guides, which are used to solve the problem in the prior art that terminals need to constantly adjust frequency points to try to receive, and can only passively accept related content.

The inventive method comprises:

A way to discover OMA BCAST business guidelines including:

A, mapping the distribution SGDD file session to the first BCMCS program, and assigning the first BCMCS program identifier; mapping the distribution SGDU file session to the second BCMCS program, and assigning the second BCMCS program identifier;

B. The terminal initiates a session discovery request to the BCMCS adapter via the broadcast service node, where the session discovery request carries the first BCMCS program identifier and/or the second BCMCS program identifier;

C. The BCMCS adapter sends the file session to the terminal according to the first BCMCS program identifier and/or the second BCMCS program identifier.

Described step A also includes:

Mapping each IP multicast session in the SGDD file distribution session to a first BCMCS stream, and assigning a first BCMCS stream discriminator, the first BCMCS program identifier and the first BCMCS stream discriminator together constitute a first BCMCS stream identifier symbol.

In the step B, the session discovery request carries the first BCMCS flow identifier, and in the step C, the BCMCS adapter also distributes the SGDD file according to the first BCMCS flow identifier The IP multicast session in the session is sent to the endpoint.

Described step A also includes:

Mapping each IP multicast session in the session of distributing SGDU files to a second BCMCS stream, and assigning a second BCMCS stream discriminator, the second BCMCS program identifier and the second BCMCS stream discriminator together constitute a second BCMCS stream identifier symbol.

In the step B, the session discovery request may also carry the second BCMCS flow identifier, and in the step C, it also includes that the BCMCS adapter distributes according to the second BCMCS flow identifier The IP multicast session in the SGDU file session is sent to the endpoint.

Said step B also includes a step of the broadcast service node analyzing the BCMCS adapter according to said first and/or second BCMCS program identifier.

Said step B further includes a step of the terminal judging whether to receive the SGDU file session.

The terminal judges whether to receive the SGDU file distribution session, based on the description information of the SGDU file distribution session in the SGDD file distribution session received by the terminal, and judges whether the terminal has received the SGDU file distribution session, or whether the received SGDU file distribution is outdated or a newer version is available.

The step B is carried out periodically.

The first BCMCS program identifier and/or the second BCMCS program identifier are globally unique.

The inventive system includes:

A system for discovering OMA BCAST service guidelines, comprising BCMCS adapters and broadcast service nodes, further comprising:

The distribution SGDD file session mapping unit provided in the BCMCS adapter is used to map the distribution SGDD file session to a first BCMCS program and assign a first BCMCS program identifier;

The distribution SGDU file session mapping unit set in the BCMCS adapter is used to map the distribution SGDU file session to a second BCMCS program and assign a second BCMCS program identifier;

The broadcast service node is configured to receive a session discovery request initiated by a terminal and carrying the first BCMCS program identifier and/or the second BCMCS program identifier; and send the session discovery request to the BCMCS adapter ;

The BCMCS adapter is configured to send the file session to the terminal according to the first BCMCS program identifier and/or the second BCMCS program identifier.

The BCMCS adapter further includes:

Distributing the SGDD file session IP multicast session mapping unit, for distributing each IP multicast session in the SGDD file session is mapped to the first BCMCS flow, and assigning the first BCMCS flow discriminator;

The distribution SGDU file session IP multicast session mapping unit is configured to map each IP multicast session in the SGDU file session to a second BCMCS flow, and assign a second BCMCS flow discriminator.

The adoption of the solution of the invention enables the terminal of the BCAST service subscriber to actively discover and receive the BCAST service guide in the BCMCS network.

The solution of the present invention does not require any major changes to the BCMCS network, and if the CDMA operator wants to provide broadcasting services by cooperating with BCAST service providers, the above solution can bring the minimum investment cost.

Description of drawings

FIG. 1 is a schematic diagram of the BCAST architecture in the prior art;

Fig. 2 is the structural representation of BCMCS program identifier and BCMCS flow identifier in the prior art;

Fig. 3 is a schematic structural diagram of the system of the present invention;

Fig. 4 is a schematic flow sheet of the present invention;

Fig. 5 is a schematic flow diagram of a terminal of the present invention initiating a request to a BCMCS adapter via a BSN;

FIG. 6 is a schematic flow diagram of a specific session of receiving a specific SGDU file by the terminal of the present invention;

Fig. 7 is a schematic diagram of the structure of the BCMCS adapter in the system of the present invention.

Detailed ways

The specific implementation manners of the present invention will be described below in conjunction with the accompanying drawings.

The system frame of the present invention is shown in Fig. 3, in the dotted line box in the figure is the existing equipment of the CDMA20001x network supporting BCMCS service, and outside the dotted line is the equipment of the BCAST service support platform. The BCMCS Adapter shown in Figure 3 can be a functional module of BCAST Service Distribution/Adaptation.

As shown in Figure 4, it is a schematic flow diagram of the present invention discovering the OMABCAST service guide method in the BCMCS network, as can be seen from the figure, the present invention's solution mainly includes the following steps:

S1. The BCMCS adapter maps the SGDD file distribution session and the SGDU file distribution session into a first BCMCS program and a second BCMCS program respectively, and assigns the related first BCMCS program identifier and the second BCMCS program identifier.

The BCMCS adapter maps all IP multicast file distribution sessions that distribute SGDD to the first BCMCS program (the first BCMCS program), assigns it a specific first BCMCS program identifier, and maps each session in the first program at the same time For the first BCMCS program stream, and assign a unique first BCMCS stream discriminator, the discriminator only needs to be unique for all IP multicast sessions in which SGDD is distributed.

The first BCMCS program identifier and the first BCMCS flow identifier are combined to form a corresponding BCMCS flow identifier (BCMCS flow identifier) of a specific SGDD distribution session.

This first BCMCS program identifier can be recorded as an SGDD program identifier, and the BCMCS stream identifiers mentioned here are called SGDD stream identifiers.

The BCMCS adapter maps all IP multicast file distribution sessions that distribute SGDUs to the second BCMCS program, and at the same time assigns it a specific second BCMCS program identifier, and distributes the IP multicast sessions that send SGDU files described in SGDD The information is mapped to the second BCMCS program stream, and the second BCMCS stream discriminator (the second BCMCS stream discriminator) is assigned to it. The mapping relationship should be one-to-one correspondence and can be calculated by a given mapping algorithm. The terminal The mapping algorithm should also be configured.

The second BCMCS program identifier and each specific second BCMCS stream identifier are combined to form a second BCMCS stream identifier.

This program identifier can be recorded as an SGDU program identifier, and the BCMCS flow identifiers mentioned here can be called SGDU flow identifiers.

In the above settings, it is necessary to ensure that the first BCMCS program identifier and the second BCMCS program identifier are different from any other program identifiers transmitted by the BCMCS network, that is to say, they should be globally unique in the BCMCS network, and for a BCAST For service users, the first BCMCS program identifier and the second BCMCS program identifier should be configured on the user terminal and the broadcast service node (BSN Broadcast Serving Node) of the BCMCS network. This configuration method can be statically configured when opening an account, or can be dynamically configured through wireless download (OTA, Over the Air), but it must be ensured that a legal user's terminal always retains the two first BCMCS program identifiers and a second BCMCS program identifier.

The above configuration of the first BCMCS program identifier and the second BCMCS program identifier, a specific implementation example, is to use the network identifier of the BCAST service provider plus an all-zero bit string (bit string) to construct the first BCMCS program identifier, and use the network identifier of the BCAST service provider plus a bit string (bit string) of all '1' to construct the second BCMCS program identifier.

S2. The terminal initiates a session discovery request to the BCMCS adapter via the BSN.

Since the terminal of the BCAST service subscriber is configured with the first BCMCS program identifier and the second BCMCS program identifier, and the mapping method of distributing IP multicast session information to the BCMCS stream discriminator from the SGDU file. When the user wants to receive the service guide, the terminal initiates a session discovery request to the BCMCS adapter via the BSN, and the session discovery request carries the above-mentioned first BCMCS program identifier and the second BCMCS program identifier, and may also carry the corresponding The first BCMCS flow identifier and the second BCMCS flow identifier of the first BCMCS flow discriminator and the second BCMCS flow identifier.

The carrying of the first BCMCS program identifier and the second BCMCS program identifier and the first BCMCS stream identifier corresponding to the first BCMCS stream identifier and the second BCMCS stream identifier of the second BCMCS stream identifier can be carried according to The actual needs of the terminal determine whether to carry and which content to carry. When the terminal only needs to distribute the SGDD file session, it can only carry the first BCMCS program identifier; if the terminal only needs to distribute a specific IP multicast session in the SGDD file session, it can only carry the corresponding first BCMCS stream The first BCMCS stream identifier of the discriminator; if the terminal needs to distribute the SGDU file session, it can only carry the second BCMCS program identifier; if the terminal only needs to distribute a specific IP multicast session in the SGDU file session, then Only the second BCMCS flow identifier corresponding to the second BCMCS flow identifier may be carried.

In the above scheme, in fact, the terminal first decides whether to receive the SGDD file distribution session or a specific SGDU file distribution session according to the processing method defined by OMA BCAST, and then should send a request message containing a different BCMCS program identifier according to the corresponding situation , the following scheme can be adopted specifically:

The terminal regularly receives and distributes SGDD file sessions, and judges which distribution SGDU file sessions need to be received according to the information provided by the distribution SGDD file sessions. For example, if it has never received a distribution SGDU file session, it should receive all distribution SGDU file sessions. If If you have already received it, you should judge which parts of the SGDU file distribution session you have received are outdated or have a new version based on the information provided by the SGDD file distribution session, so as to decide to receive the new version.

S3. The BCMCS adapter sends the requested session file to the terminal according to the session discovery request initiated by the terminal.

For the first BCMCS program identifier and the second BCMCS program identifier and the first BCMCS stream identifier corresponding to the first BCMCS stream discriminator and the second BCMCS stream identifier corresponding to the second BCMCS stream discriminator, the BCMCS network The wireless access network in the BCMCS standard uses other processes defined by the BCMCS standard to perform BCMCS session discovery, BCMCS registration, and bearer establishment to the BSN, so that the relevant information of the SGDD file distribution session or the SGDU file distribution session can be discovered from the BSN, and the SGDD file distribution session or SGDD file distribution session can be received from the BSN. Receive the IP multicast stream of the SGDU file session, allocate air resources to broadcast these IP multicast streams, and carry one or more air channels corresponding to the file session in the broadcast overhead (Broadcast Overhead) message of the cell broadcast.

A BSN in a BCMCS network shall be able to identify the first BCMCS program identifier and the second BCMCS program identifier and the first BCMCS stream identifier corresponding to the first BCMCS stream discriminator and the second BCMCS stream discriminator corresponding to the second BCMCS stream discriminator. The BCMCS flow identifier resolves the specific BCMCS adapter, and uses the messages and procedures defined by the BCMCS standard to initiate the process of session discovery to the BCMCS adapter, and the first BCMCS program identifier and the second BCMCS program identifier here correspond to the BCMCS standard The BCMCS program identifier defined in ; the first BCMCS flow identifier corresponding to the first BCMCS flow identifier and the second BCMCS flow identifier corresponding to the second BCMCS flow identifier correspond to the BCMCS defined in the BCMCS standard respectively stream identifier. The BCMCS adapter is mapped to the corresponding IP multicast file distribution session according to the first/second BCMCS program identifier or the first/second BCMCS flow discriminator, and returns these session information to the BSN using the corresponding message defined by the BCMCS standard, and is determined by The BSN is sent to the terminal through the air interface.

In steps S2 and S3 of the above solution, the detailed process of the terminal initiating a request to the BCMCS adapter via the BSN and the process of the BCMCS adapter returning the session file related to the request can be shown in FIG. 5 . This scheme maps the SGDD file distribution session or the SGDU file distribution session of BCAST to BCMCS programs respectively, and assigns BCMCS program identifiers or BCMCS stream identifiers. The BCMCS adapter in this solution replaces the BCMCS controller in the BCMCS network, so the BSN needs to identify the distribution of the SGDD file session or the distribution of the SGDU file session with the BCMCS program identifier or BCMCS stream identifier as BCAST, so as to send the request message Sent to the BCMCS adapter instead of the BCMCS controller. As can be seen from Figure 5, it mainly includes the following steps:

S211, the terminal listens to the broadcast overhead message sent by the radio access network (RAN, Radio Access Network), the message will carry the air channel information where all the BCMCS programs/streams being broadcast in the current cell are located, and the terminal searches in the message The air channel corresponding to the first BCMCS program/stream identifier or the second BCMCS program/stream identifier.

S212. If the terminal does not find the air channel information corresponding to the expected first or second BCMCS program/flow identifier, the terminal initiates a BCMCS flow registration (Flow Registration) message to request to watch the program, and the message should include the first BCMCS program that the user wants to receive. One or the second BCMCS program/stream identifier (if only the first or second BCMCS program identifier is included, it indicates that all streams of the program are expected to be received, that is, all distribution SGDD file sessions or all distribution SGDU file sessions) , and may also include corresponding authentication information.

S213. If the RAN does not have the RAN session information of the corresponding BCMCS flow, or the BCMCS flow requested to register requires authentication and the RAN cannot complete the authentication, then the RAN sends an A11-BC Service Request (A11-BC Service Request) message to the BSN, and the message also Should carry the first or second BCMCS program/stream identifier and corresponding authentication information.

S214. If the BSN does not have the file session information of the corresponding BCMCS stream, or the BCMCS stream requested for registration requires authentication, the BSN shall be able to identify that the BCMCS program/stream identifier in the message is the first or second BCMCS program/stream identifier , and send an access request message to the BCMCS adapter to obtain the session information for distributing SGDD files or file session information for distributing SGDU, or to request authentication.

S215. The BSN adapter should be able to identify the access request message from the BSN, and map the first or second BCMCS program/stream identifier to the corresponding SGDD or SGDU file distribution session, and possibly according to the authentication in the access request message The information cooperates with other entities of BCAST to perform necessary authentication on the message, and then the BCMCS adapter shall send an access response message to the BSN, which shall contain the first or second BCMCS program/stream identifier and its corresponding SGDD or SGDU File distribution session information.

S216. If the BSN receives an access response message from the BCMCS adapter, and the BSN monitors that the IP multicast flow corresponding to the first or second BCMCS program/flow identifier has not been received from the BCMCS adapter at present (probably because this is the first registered The BCMCS flow request), then the BSN should use the IP multicast protocol to join the corresponding multicast group according to the IP multicast destination address in the received session information, so as to start receiving the corresponding IP multicast flow.

S217. The BSN returns an A11-BC service response message to the radio access network, and the message includes the requested file session information and/or authentication result.

S218. If the wireless access network has the file session information corresponding to the first or second BCMCS program/stream identifier or the wireless access network has received a successful authentication response from the BSN, and the wireless access network finds that it has not yet received from the BSN Corresponding IP flow (probably because this is the first request to register the BCMCS flow), the radio access network should initiate an A11-BC registration request to the BSN to establish the transmission of the corresponding first or A11 bearer of the second BCMCS stream.

S219. After the BSN receives the A11-BC registration request, it establishes a connection with the wireless access network, so that the first or second BCMCS flow can be transmitted to the wireless access network, and returns an A11-BC registration response message to the wireless access network. Access Network.

S2110. The radio access network starts to receive the first or second BCMCS flow from the BSN.

S2111. After successfully receiving the corresponding first or second BCMCS flow from the BSN, the radio access network allocates an air channel to it.

S2112. The wireless access network adds air channel information corresponding to the first or second BCMCS stream to the subsequent broadcast overhead message, and the terminal can adjust its receiving frequency to watch the file session according to this information.

In the above steps S2 and S3, if the terminal wants to receive a specific specific SGDU file distribution session, it means that the terminal has already obtained the SGDD file distribution session, so the terminal should know the file distribution IP multicast corresponding to the SGDU file distribution session it wants to receive Session information, the terminal should map the file session information into a BCMCS stream identifier according to the configured algorithm, construct a BCMCS stream identifier together with the SGDU program identifier configured on it, and then receive the BCMCS stream according to the process defined by BCMCS The broadcast stream corresponding to the identifier is sufficient, and the processing after receiving is performed according to the definition of the BCAST standard. As shown in Figure 6, it mainly includes the following steps:

S221. The terminal decides to receive a certain SGDU file distribution session.

S222. The terminal calculates the corresponding BCMCS flow discriminator according to the session information described in the SGDD file distribution session for the SGDU file distribution session and the configured mapping algorithm.

S223, the terminal will configure the SGDU program identifier (for example, the binary number 000001100000 in the aforementioned example to uniquely identify the BCAST network, then it is possible to use 000001100000 to connect ten 1s (1111111111) together to form the SGDU program identifier), and the calculated The BCMCS flow discriminator (maybe 7 0s) together form the BCMCS stream identifier, the result is 11100000110000011111111110000000, a total of 32 bits, the first 3 bits identify the length of the BCMCS stream discriminator is 7, the middle 22 bits are the SGDU program identifier, and the latter Bit 7 is the BCMCS stream discriminator.

S224. The terminal uses the BCMCS flow identifier calculated in step S223 to apply to the network for receiving and distributing the SGDU file session. Here, the flow defined by BCMCS is used.

S225. In the BCMCS process, the BSN should recognize that the BCMCS flow identifier corresponds to an SGDU provided by a certain BCAST network, and therefore request the corresponding BCMCS adapter for the distribution SGDU file session.

S226. The BCMCS adapter sends the SGDU file distribution session to the terminal via the BSN, and other procedures are the same as those of the BCMCS.

The present invention also provides a system for discovering the OMA BCAST service guide, which can be set in the same way as the OMA BCAST service guide system in the prior art. On this basis, as shown in Figure 7, the present invention sets in BCMCS adapter 10:

Distributing the SGDD file session mapping unit 11, configured to map the distribution SGDD file session as the first BCMCS program, and assign the first BCMCS program identifier;

The distribution SGDU file session mapping unit 12 is configured to map the distribution SGDU file session into a second BCMCS program, and assign a second BCMCS program identifier.

The SGDD file distribution session IP multicast session mapping unit 13 is configured to map each IP multicast session in the SGDD file distribution session to a first BCMCS flow, and assign the first BCMCS flow identifier.

The SGDU file distribution session IP multicast session mapping unit 14 is configured to map each IP multicast session in the SGDU file distribution session to a second BCMCS flow, and assign a second BCMCS flow discriminator.

The adoption of the scheme of the invention enables the terminal of the BCAST service subscriber to discover and receive the BCAST service guide in the BCMCS network.

The solution of the present invention does not require any major changes to the BCMCS network, and if the CDMA operator wants to provide broadcasting services by cooperating with BCAST service providers, the above solution can bring the minimum investment cost.

Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalent technologies, the present invention also intends to include these modifications and variations.

Claims (12)

1, a kind of method of finding Open Mobile Alliance broadcasting OMA BCAST business guide is characterized in that,

A, distribution service guide distribution descriptor SGDD file session is mapped as a BCMCS program, and distributes a BCMCS program identifier; Distribution service guide Dispatching Unit SGDU file session is mapped as the 2nd BCMCS program, and distributes the 2nd BCMCS program identifier;

B, terminal are found request through the broadcast service node to BCMCS adapter initiation session, and described session is found to carry a described BCMCS program identifier and/or described the 2nd BCMCS program identifier in the request;

C, BCMCS adapter send to terminal according to a described BCMCS program identifier and/or described the 2nd BCMCS program identifier with described file session.

2, the method for claim 1 is characterized in that, described steps A also comprises:

Each ip multicast session in the distribution SGDD file session is mapped as BCMCS stream, and distributes BCMCS stream authenticator, a described BCMCS program identifier and BCMCS stream authenticator constitute a BCMCS flow identifier together.

3, method as claimed in claim 2, it is characterized in that, among the described step B, request is found in described session, carry a described BCMCS flow identifier, among the described step C, also comprise the BCMCS adapter, the ip multicast session in the distribution SGDD file session is sent to terminal according to a described BCMCS flow identifier.

4, the method for claim 1 is characterized in that, described steps A also comprises:

Each ip multicast session in the distribution SGDU file session is mapped as the 2nd BCMCS stream, and distributes the 2nd BCMCS stream authenticator, described the 2nd BCMCS program identifier and the 2nd BCMCS stream authenticator constitute the 2nd BCMCS flow identifier together.

5, method as claimed in claim 4, it is characterized in that, among the described step B, request is found in described session, can also carry described the 2nd BCMCS flow identifier, among the described step C, also comprise the BCMCS adapter, the ip multicast session in the distribution SGDU file session is sent to terminal according to described the 2nd BCMCS flow identifier.

6, the method for claim 1 is characterized in that, among the described step B, also comprises the broadcast service node according to the described first and/or the 2nd BCMCS program identifier, the step of parsing BCMCS adapter.

7, the method for claim 1 is characterized in that, among the described step B, comprises further whether terminal judges receives the step of SGDU file session.

8, method as claimed in claim 7, it is characterized in that, whether described terminal judges receives distribution SGDU file session, be to the descriptor of distribution SGDU file session in the distribution SGDD file session that receives according to terminal, judge whether terminal received this distribution SGDU file session, whether the distribution SGDU file that perhaps received is out-of-date or new version arranged.

9, the method for claim 1 is characterized in that, described step B carries out in the cycle.

10, the method for claim 1 is characterized in that, a described BCMCS program identifier and/or the 2nd BCMCS program identifier are that the overall situation is unique.

11, a kind of system that finds OMA BCAST business guide comprises BCMCS adapter and broadcast service node, it is characterized in that, also comprises:

Be arranged on the distribution SGDD file session map unit in the described BCMCS adapter, be used for described distribution SGDD file session is mapped as a BCMCS program, and distribute a BCMCS program identifier;

Be arranged on the distribution SGDU file session map unit in the described BCMCS adapter, be used for described distribution SGDU file session is mapped as the 2nd BCMCS program, and distribute the 2nd BCMCS program identifier;

Described broadcast service node is used for the session discovery request that carries a described BCMCS program identifier and/or described the 2nd BCMCS program identifier that receiving terminal is initiated; Described session is found that request sends to described BCMCS adapter;

Described BCMCS adapter is used for according to a described BCMCS program identifier and/or described the 2nd BCMCS program identifier described file session being sent to described terminal.

12, system as claimed in claim 11 is characterized in that, described BCMCS adapter also comprises:

Distribution SGDD file session ip multicast session map unit is used for each ip multicast session of distribution SGDD file session is mapped as BCMCS stream, and distributes BCMCS stream authenticator;

Distribution SGDU file session ip multicast session map unit is used for each ip multicast session of SGDU file session is mapped as the 2nd BCMCS stream, and distributes the 2nd BCMCS stream authenticator.

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