CN101938700B - Method and system for data flow transmission in broadcast-multicast service system - Google Patents

Abstract

The invention discloses a method for data flow transmission in a broadcast-multicast service (BCMCS) system. The method comprises the following steps of: a BCMCS server node (BSN) determines whether a multicast group is established for a program selected by a mobile station (MS) and establishes one multicast group for the program if the multicast group is not established for the program; BSN transmits multicast group information to a base station controller/packet control function (BSC/PCF) after the multicast group or new multicast group is established for the program; the BSC/PCF determines whether the BSC/PCF is joined in the multicast group corresponding to the program and joins in the multicast group when not joining the multicast group; and the BSN transmits a BCMCS data flow to the BSC/PCF by an IP multicast mode according to a maintained multicast information sheet of the BSN and the BSC/PCF forwards the BCMCS data flow to the MS. The invention also discloses a system for the data flow transmission in the BCMCS system. By using the method and the system, network load between the BSN and the BSC/PCF is relieved and the requirement on BSN processing capacity is reduced.

Description

The method and system of data stream transmitting in a kind of broadcast multi-broadcasting service system

Technical field

The present invention relates to the method for procotol (IP:Internet Protocol) communication in network communications technology field, relate in particular to the method and system of data stream transmitting in a kind of broadcast multi-broadcasting service system (BCMCS:Broadcast-Multicast Service).

Background technology

Along with the development of Internet technology and mobile communication technology, the various mobile services based on different systems emerge in an endless stream.BCMCS in code division multiple access system (CDMA:Code Division Multiple Access) is exactly a kind of new form of service, and it provides broadcast and multicast services by mobile cellular system to authorized user, as mobile terminal television service.BCMCS, by the mode for data encryption, ensures that the mobile terminal of only knowing key could correct deciphering obtain data content, only has authorized user just can enjoy the service of BCMCS thereby realize.Core-network side BCMCS utilize IP technology needs are broadcasted or the transfer of data of multicast to airlink; Aloft on link, BCMCS adopts broadcast or multicast mode to save air resource.Described broadcast refers to data is sent to all users, for example station broadcast and television services.Multicast refers to and only sends the data to the user who joins particular group.Be illustrated in figure 1 BCMCS system representative network structure in CDMA; Be illustrated in figure 2 BCMCS service node (BSN:BCMCS Server Node) to the BCMCS traffic propagation mode between base station/Access Network (BS/AN:Base Station/Access Network), this figure has shown the protocol stack model between BSN and wireless access network (RAN:Radio Access Network) simultaneously, and wherein IP layer adopts mode of unicast transmission data.

BCMCS content server sends to BSN by the mode of unicast of multicast or generic route encapsulation (GRE:Generic Routing Encapsulation) tunnel encapsulation encrypted program data; BSN searches base station controller (BSC:Base Station the Controller)/packet data control (PCF:Packet Control Function) of having applied for this program, copy encrypted program data and encapsulate with A10 form, adopting the mode of clean culture to send respectively to the BSC/PCF that applies for this program; BSC/PCF receives the program data of A10 form encapsulation, and BSC/PCF searches the BS/AN that has applied for this program being connected with self, copies encrypted program data and is forwarded to the BS/AN that applies for this program; BS/AN receives after encrypted program data, to broadcast or the mode of multicast sends on wireless common signal channel; Wireless terminal uses this program data of secret key decryption of knowing, obtains correct original program data.

Wireless terminal is in order to obtain BCMCS service, must be by BSC/PCF and BSN to service authentication mandate charging (SAAA:Service Authentication, Authorization, Accounting) or BCMCS controller (BCMCS Controller), SAAA/BCMCS Controller submit to registration request, the flow process of 3GPP2 defined is as shown in Figure 3, specific as follows:

Step 301: wireless terminal (MS:Mobile Station) receives the broadcast (overhead messages) from BSC/PCF; Wireless terminal prompting user has BCMCS programme information, and points out user whether to need registration;

Step 302: when user need to register, MS initiates BCMCS registration, sends the BCMCS registration request (BCMCS Registration) that carries authentication information to BSC/PCF;

Step 303:BSC/PCF initiates BCMCS service request to BSN, to obtain session information;

BSC/PCF sends the BCMCS service request (BCMCS Service Request) of carrying authentication information according to the registration request receiving to BSN;

Step 304:BSN initiates to dial in based on remote validation user the access request of service (RADIUS:Remote Authentication Dial-In User Service) to SAAA/BCMCS Controller, obtaining session information, is also the beginning of service discovery process;

BSN sends the access request of carrying authentication information (Access Request) based on RADIUS according to the BCMCS service request receiving to SAAA/BCMCS Controller;

Step 305:SAAA/BCMCS Controller carries out authentication according to the access request that receives to MS, and authentication is returned to by backward BSN the RADIUS that carries BCMCS session information and accepted message (Access Accept);

Step 306:BSN receives and accepts after message, records the backward BSC/PCF of BCMCS session information and returns to the BCMCS service response (BCMCS Service Response) of carrying BCMCS session information;

Step 307:BSC/PCF receives after BCMCS service response, and the BCMCS registration request of MS transmission in step 302 is transmitted to BSN, requires BSN to set up A10 passage simultaneously;

Described A10 passage is the bearer path between BSN and BSC/PCF in cdma network, each A10 link is unidirectional, can only from BSN to BSC/PCF, transmit BCMCS data flow, and two A10 links of same BSC/PCF can not be transmitted identical BCMCS data flow, and each A10 link once can only be transmitted a BCMCS data flow.

Step 308:BSN is through creating network, establishes the relevant backward BSC/PCF of A10 passage and returns to BCMCS registration request and reply (BCMCS Registration Reply);

After step 309:BSC/PCF receives that BCMCS registration request is replied, send registration request reply (Registration Accept) to MS, notice subscription authentication is passed through;

Between step 310:BCMCS and MS, carry out the BCMCS data flow transmission of this program;

Step 311:BSC/PCF detects by detecting the mode of data traffic the BCMCS data flow that whether has this program of MS continuation reception under it, in the time that BSC/PCF checks out the BCMCS data flow that there is no this program of MS continuation reception under it, send the request of the BCMCS data flow that discharges this program to BSN;

Step 312:BSN receives this request and discharges related resource, and sends request and reply to BSC/PCF.

At present in the specification of 3GPP2, mention the forwarding that realizes BCMCS data flow from BCMCS content server to the mode of unicast that can adopt multicast or GRE encapsulation BSN, but at BSN to still adopting traditional A10 passage to carry BCMCS data flow between BSC/PCF.A10 passage is a gre tunneling between BSC/PCF and BSN, is a unicast data stream, and BSN is unicast transmission to the data stream transmitting between BSC/PCF.Described clean culture (Unicast) transmission refers to that between sender and each recipient, realizing point-to-point network connects, under unicast transmission mode, if a sender transmits identical data to multiple recipients simultaneously, must correspondingly copy many parts of identical packets; If while having a large amount of recipients to require to obtain same packet, overburden, postpone long, network congestion will to cause sender.Under prior art, between BSN and BSC/PCF, transfer of data adopts mode of unicast, if multiple BSC/PCF or multiple MS require the service of same BCMCS simultaneously, between BSC/PCF and BSN, can transmit the data flow that multiple contents are identical simultaneously, strengthen the load of network path between BSC/PCF and BSN, the bandwidth of waste network; And on BSN because need to send identical data flow to different BSC/PCF, require BSN to carry out multiple copies to data stream, the disposal ability of waste BSN, also makes BSN become a bottleneck in BCMCS system.

Summary of the invention

In view of this, main purpose of the present invention is to provide the method and system of data stream transmitting in a kind of BCMCS of realization system, alleviates in BCMCS system the load of network between BSN and BSC/PCF; Reduce the requirement to BSN disposal ability in BCMCS system.

For achieving the above object, technical scheme of the present invention is achieved in that

A kind of method of data stream transmitting in broadcast multi-broadcasting service BCMCS system, comprise: the multicast information table that BCMCS serving node B SN safeguards according to self sends to base station controller/packet data control BSC/PCF by procotol IP multicast mode by BCMCS data flow, BSC/PCF forwards the BCMCS data flow receiving by IP multicast mode according to the multicast information table of self.

In such scheme, the multicast information table that described BSN safeguards according to self sends BCMCS data flow by IP multicast mode, comprising:

BSN judges whether for the selected program of MS creates multicast group, if while not creating multicast group for this program, in described multicast information table, be this program establishment multicast group, pass through IP multicast mode according to described multicast group information and send BCMCS data flow, and send multicast group information to BSC/PCF; If, for this program creates multicast group, send BCMCS data flow according to described multicast group information by IP multicast mode, and send multicast group information to BSC/PCF.

In such scheme, described multicast information table comprises program ID and multicast group information, the key assignments GRE KEY that described multicast group information comprises multicast address and Generic Routing Encapsulation corresponding to this multicast;

Described BSN judges whether to be specially for the selected program of MS creates multicast group: BSN inquires about according to the program address ID receiving the multicast information table of self safeguarding, check and whether have the multicast group information corresponding with this program ID, if existed, determine to be that described program creates multicast group; If there is no, determine not to be that described program creates multicast group; And/or,

Describedly in described multicast information table, be specially for program creates multicast group: BSN selects idle multicast address and an idle GRE KEY to create a multicast group, this multicast group in described multicast information table taking the program ID of this program as index.

Preferably, described BSC/PCF sends BCMCS data flow according to the multicast information table of self by IP multicast mode, comprising:

The multicast group information that BSC/PCF sends according to BSN, inquire about in the multicast information table of self safeguarding and whether have this multicast group information, if existed, determine and self added corresponding multicast group, send BCMCS data flow according to described multicast information table by IP multicast mode; If there is no, determine and self do not add corresponding multicast group, add this multicast group, send BCMCS data flow according to described multicast information table by IP multicast mode.

Preferably, the described multicast group that adds is specially: the multicast group information receiving is added in the multicast information table of self safeguarding, and send the IGMP IGMP report that adds this multicast group to the network between BSN and BSC/PCF, notify the equipment self on this network to add this multicast group.

In such scheme, in described BCMCS data stream transmitting process, the method further comprises:

BSN sends igmp querying to BSC/PCF, determines whether the BCMCS data flow of the program that BSC/PCF carries in forwarding multicasting group in addition, if had, the multicast information table that continues to safeguard according to self sends BCMCS data flow by IP multicast mode; Otherwise, discharge the bearer path between BSN and BSC/PCF, finish the transmission of BCMCS data flow.

Preferably, described after BSC/PCF sends igmp querying, further comprise: in the time that BSC/PCF receives igmp querying, if also have MS below BSC/PCF in the BCMCS data flow that receives this program, BSC/PCF returns to IGMP report to BSN; Otherwise BSC/PCF does not return to IGMP report, and delete the multicast group information corresponding with this program in the multicast information table of self maintained, exit described multicast group;

The described BCMCS data flow that determines whether the program that BSC/PCF carries in forwarding multicasting group in addition, be specially: if receive the IGMP report that BSC/PCF returns at the appointed time, define the BCMCS data flow of the program that BSC/PCF carries in forwarding multicasting group, the multicast information table that continues to safeguard according to self sends BCMCS data flow by IP multicast mode; If do not receive the IGMP report that BSC/PCF returns at the appointed time, determine the BCMCS data flow that there is no the program that BSC/PCF carries in forwarding multicasting group, the bearer path between BSN request release self and BSC/PCF, meanwhile, the multicast group information corresponding with this program in the multicast information table of BSN deletion self maintained.

The present invention also provides the system of data stream transmitting in a kind of BCMCS of realization system, and this system comprises: BSC/PCF, BSN; It is characterized in that,

BSN, sends to BSC/PCF by IP multicast mode by BCMCS data flow for the multicast information table according to self;

BSC/PCF, for sending the BCMCS data flow receiving by IP multicast mode according to the multicast information table of self.

In such scheme, described BSN is for sending BCMCS data flow according to the multicast information table of self by IP multicast mode, be specially: BSN judges whether for the selected program of MS creates multicast group, if while not creating multicast group for this program, it in described multicast information table, is this program establishment multicast group, send BCMCS data flow according to described multicast group information by IP multicast mode, and send multicast group information to BSC/PCF; If, for this program creates multicast group, send BCMCS data flow according to described multicast group information by IP multicast mode, and send multicast group information to BSC/PCF; And/or,

Described BSN is further used for sending igmp querying to BSC/PCF, determines while not receiving at the appointed time the corresponding IGMP report that BSC/PCF returns, and request discharges the bearer path between self and BSC/PCF, deletes corresponding multicast group information.

Preferably, described BSC/PCF is for sending the BCMCS data flow receiving by IP multicast mode according to the multicast information table of self, be specially: the multicast group information that BSC/PCF sends according to BSN, inquire about in the multicast information table of self safeguarding and whether have this multicast group information, if existed, determine and self added corresponding multicast group, send BCMCS data flow according to described multicast information table by IP multicast mode; If there is no, determine and self do not add corresponding multicast group, add this multicast group, send BCMCS data flow according to described multicast information table by IP multicast mode; And/or,

Described BSC/PCF is further used for receiving after igmp querying, if there is MS to receive BCMCS data flow, returns to IGMP report to BSN; If do not have MS to receive BCMCS data flow, do not return to IGMP report, and delete the multicast group information corresponding with this program in the multicast information table of self maintained, exit described multicast group.

This shows, in terms of existing technologies, owing to adopting the method for IP multicast transmission between BSN and BSC/PCF, BSN only need once copy the multicast address that sends to program corresponding by the BCMCS data flow receiving, add the BSC/PCF of the corresponding multicast group of this multicast address all can receive BCMCS data flow, alleviated the network load between BSN and BSC/PCF in BCMCS system; Reduce the requirement to BSN disposal ability in BCMCS system.

Brief description of the drawings

Fig. 1 is BCMCS system representative network Organization Chart in CDMA;

Fig. 2 be in BCMCS system BSN to traffic propagation mode schematic diagram between BS/AN;

Fig. 3 is the schematic flow sheet of the BCMCS media stream transmission method of 3GPP2 defined;

Fig. 4 is the schematic diagram that in the present invention, in BCMCS system, a kind of media stream transmission method is realized.

Embodiment

IP multicast uses specific IP multicast address, and the principle of delivering according to maximum, is transferred to IP datagram the main frame set of a multicast group (multicast group).The basic skills of IP multicast is: in the time that a sender sends data to one group of recipient, sender needn't send data to each recipient, only data need be sent to a specific multicast address, all recipients that add this multicast group all can receive this piece of data, for sender, data only need send and once just can send to all recipients, have greatly alleviated the load of network and sender's burden.Basic thought of the present invention is between BSN and BSC/PCF, to adopt IP multicasting technology transmitting data stream, and BSN adopts multicast mode that BCMCS data flow is sent to BSC/PCF, realizes the transmission of BCMCS data flow.

Below in conjunction with the drawings and specific embodiments, the present invention is described in detail.

The realization flow of realizing data flow transmission method in BCMCS system of the present invention as shown in Figure 4, comprises the following steps:

Step 401:MS receives the broadcast from BSC/PCF; Prompting user has BCMCS programme information, and points out user whether to need registration;

Step 402: when user need to register, MS initiates BCMCS registration request, sends the registration request that carries authentication information to BSC/PCF;

User selects after program, is initiated the BCMCS registration request of this program by MS, sends the registration request that carries authentication information to BSC/PCF.

Step 403:BSC/PCF initiates BCMCS service request to BSN;

BSC/PCF sends the service request of carrying authentication information according to the registration request receiving to BSN, to obtain session information.

Step 404:BSN receives after service request, initiates the access request based on RADIUS to SAAA/BCMCS Controller, obtains session information, and this is the beginning of service discovery process;

BSN sends the access request of carrying authentication information according to the service request receiving to SAAA/BCMCS Controller;

Step 405:SAAA/BCMCS Controller carries out authentication according to the authentication information in the access request receiving to MS, and MS is by after authentication, returns to the access based on RADIUS of carrying BCMCS session information accept message to BSN;

The program address (ID) that step 406～408:BSN accepts to comprise in message according to access is inquired about the multicast information table of self safeguarding, if for this program has created a multicast group, perform step 407, BSN to the response of BSC/PCF return service, then continue execution step 409; If, for this service-creation multicast group, do not perform step 408, for this program creates a multicast group, then perform step 407, BSN responds to BSC/PCF return service;

Described multicast information table is: the corresponding table of program ID and multicast group information, this table comprises the key assignments (GRE KEY) of multicast address and Generic Routing Encapsulation corresponding to this multicast using program ID as index content.Therefore can identify a BCMCS program with multicast address and GRE KEY.

BSN records after the session information that access that SAAA/BCMCS Controller returns accepts to comprise in message, the program ID that accepts to comprise in message according to access inquires about the multicast information table of self safeguarding, if existed and the corresponding list item of this program ID in multicast information table, the i.e. multicast group information corresponding with this program, determine for this program has created a multicast group, extract the multicast group information corresponding with this program, add in the service response of carrying BCMCS session information of returning to BSC/PCF, respond to BSC/PCF return service; If there is not the corresponding list item with this program ID in multicast information table, determine not for this program creates multicast group, BSN selects an idle multicast address and an idle GRE KEY for this program creates a multicast group, in multicast information table, creates the corresponding list item of a program ID taking this program as index; After establishment completes, corresponding multicast group information is added in the service response of carrying BCMCS session information that need to return to BSC/PCF, respond to BSC/PCF return service;

Described multicast group information comprises: multicast address and the GRE KEY corresponding with this program in multicast information table; In the service response that described BSN returns to BSC/PCF, comprise: the multicast address that BCMCS session information and this program are corresponding and GRE KEY.

Step 409:BSC/PCF extracts multicast group information after receiving service response, judge whether to add this multicast group, if do not add this multicast group, perform step 410, add this multicast group and send IGMP (IGMP:Internet Group Message Protocol) report to network, then perform step 411, send BCMCS registration request to BSN; If added this multicast group, perform step 411, BSC/PCF and send BCMCS registration request to BSN;

BSC/PCF extracts multicast group information after receiving service response, inquire about in the multicast information table of self safeguarding and whether have this multicast group information, if there is no, BSC/PCF determines and self does not add and the corresponding multicast group of this multicast group information, extracted multicast group information is added in the multicast information table of self safeguarding, add this multicast group, and send and add the IGMP of this multicast group to report to the network between BSN and BSC/PCF, self has added this multicast group equipment on informing network, in the time that receiving the BCMCS data flow of program of this multicast group carrying, the equipment on network will forward to this BSC/PCF, add after multicast group, BSC/PCF sends BCMCS registration request to BSN, if there is the multicast group information identical with received multicast group information in the multicast information table that BSC/PCF safeguards, BSC/PCF determines and self has added the corresponding multicast group of this multicast group information, do not send IGMP report to the network between BSN and BSC/PCF, BSC/PCF directly sends BCMCS registration request to BSN, requires BSN to set up A10 passage, the table that the multicast information table that described BSC/PCF safeguards forms for the multicast group information of the added multicast group of BSC/PCF, multicast group information: comprise multicast address and GRE KEY.

Step 412:BSN is through creating network, establishes the relevant backward BSC/PCF of A10 passage and returns to registration request and reply;

Step 413:BSC/PCF sends registration to MS and accepts message, and notice subscription authentication is passed through;

The BCMCS data flow of this program that step 414:BSN comes BCMCS content server sends to BSC/PCF by the mode of multicast;

BSN receives after the BCMCS data flow of this program, the multicast information table of safeguarding according to self, think after the corresponding multicast address of multicast group that this program creates encapsulates and send on the network between BSN and BSC/PCF, all BSC/PCF that are incorporated as the multicast group that this program creates all can receive the BCMCS data flow of this program.

Step 415～418:BSN regularly sends igmp querying to BSC/PCF, determines whether that BSC/PCF, in the BCMCS data flow of the program of the corresponding multicast group carrying of forwarding, if had, performs step 418 in addition, proceeds the transmission of BCMCS data flow; Otherwise execution step 417, discharges the bearer path between BSN and BSC/PCF, finishes the transmission of BCMCS data flow;

BSC/PCF receives that after the igmp querying that BSN sends,, if also have MS receiving the BCMCS data flow of this program below BSC/PCF, BSC/PCF returns to an IGMP report to the network between BSN and BSC/PCF; Otherwise BSC/PCF does not return to IGMP report, and delete the multicast group information corresponding with this program in the multicast information table of self maintained, exit this multicast group, stop receiving the BCMCS data flow of this program.The described BCMCS data flow that determines whether the program that BSC/PCF carries in forwarding multicasting group in addition, be specially: if receive at the appointed time the IGMP report that BSC/PCF returns, define the BCMCS data flow of the program that BSC/PCF carries in forwarding multicasting group, BSN continues according to self safeguarding that this multicast information table is by IP multicast mode transmission BCMCS data flow; If the IGMP report that BSC/PCF returns is not received in igmp querying at the appointed time, determine the BCMCS data flow that there is no the program that BSC/PCF carries in forwarding multicasting group, the bearer path between BSN request release self and BSC/PCF, meanwhile, the multicast group information corresponding with this program in the multicast information table of BSN deletion self maintained.Described bearer path is the A10 passage between BSN and BSC/PCF; The cycle of described transmission igmp querying is empirical value.

In conjunction with specific embodiments the flow process of the multicast channel of BCMCS data flow between the establishment BSN under different situations and BSC/PCF is elaborated.

If the service of a program of the request of the First MS1 under BSC1/PCF1, and now BSN, not for this program creates multicast group, is so specifically treated to:

In registration process, the program ID that BSN basis receives inquires about the multicast information table of self safeguarding, determines not to be that this program creates multicast group, and idle multicast address of BSN selection and an idle GRE KEY are a multicast group of this program establishment; After establishment completes, multicast address corresponding this program and GRE KEY are added in the service response of carrying BCMCS session information that need to return to BSC1/PCF1, respond to BSC1/PCF1 return service;

BSC1/PCF1 extracts multicast group information after receiving service response, inquire about the multicast information table of self safeguarding, determine that BSC1/PCF1 does not add the corresponding multicast group of this multicast group information, multicast group information is added in the multicast information table of self safeguarding, and send an IGMP report to the network between BSN and BSC1/PCF1, notify the equipment self on this network to add this multicast group; And send BCMCS registration request to BSN;

If the MS2 under BSC1/PCF1 initiates and the service of MS1 same program, now on BSN for this program has created multicast group, and BSC1/PCF1 added multicast group corresponding to this program, is so specifically treated to,

In registration process, BSN inquires about according to the program ID receiving the multicast information table of self safeguarding, determine for this program has created multicast group, extract multicast address and the GRE KEY that this program is corresponding and add in the service response of carrying BCMCS session information that need to return to BSC1/PCF1, respond to BSC1/PCF1 return service;

BSC1/PCF1 extracts multicast group information after receiving service response, inquire about the multicast information table of self safeguarding, determine that BSC1/PCF1 has added the corresponding multicast group of this multicast group information, BSC1/PCF1 does not send IGMP report to network, directly sends BCMCS registration request to BSN;

If the service of MS3 initiation under BSC2/PCF2 and MS1, MS2 same program, BSN has created multicast group for this program, and still, BSC2/PCF2 does not also add this multicast group, corresponding process as follows:

In registration process, after BSN recording conversation information, the program ID that accepts to comprise in message according to access inquires about the multicast information table of self safeguarding, determine for this program has created a multicast group, extract corresponding multicast address and GRE KEY and add in the service response of carrying BCMCS session information of returning to BSC2/PCF2, respond to BSC2/PCF2 return service;

BSC2/PCF2 extracts multicast group information after receiving service response, inquire about the multicast information table of self safeguarding, determine that BSC2/PCF2 does not add this multicast group, this multicast group information is added in the multicast information table of self maintained, and sending an IGMP report to the network between BSN and BSC2/PCF2, self has added this multicast group the equipment on informing network; Send BCMCS registration request to BSN;

The present invention also provides the system of data stream transmitting in a kind of BCMCS of realization system, and this system comprises: BSC/PCF, BSN; Wherein,

BSN, for sending to BSC/PCF by IP multicast mode by the BCMCS data flow receiving according to the multicast information table of self;

BSC/PCF, for sending the BCMCS data flow receiving by IP multicast mode according to the multicast information table of self.

Described BSN is for sending BCMCS data flow according to the multicast information table of self by IP multicast mode, be specially: BSN judges whether for the selected program of MS creates multicast group, if while not creating multicast group for this program, it in described multicast information table, is this program establishment multicast group, send BCMCS data flow according to described multicast group information by IP multicast mode, and send multicast group information to BSC/PCF; If, for this program creates multicast group, send BCMCS data flow according to described multicast group information by IP multicast mode, and send multicast group information to BSC/PCF;

BSN is further used for sending igmp querying to BSC/PCF, if do not receive at the appointed time the corresponding IGMP report that BSC/PCF returns, the bearer path between BSN request release self and BSC/PCF, deletes corresponding multicast group information; Return to corresponding IGMP report if receive at the appointed time BSC/PCF, the multicast information table that continues to safeguard according to self sends BCMCS data flow by IP multicast mode.

Described BSC/PCF is for sending the BCMCS data flow receiving by IP multicast mode according to the multicast information table of self, be specially: the multicast group information that BSC/PCF sends according to BSN, inquire about in the multicast information table of self safeguarding and whether have this multicast group information, if existed, determine and self added corresponding multicast group, send BCMCS data flow according to described multicast information table by IP multicast mode; If there is no, determine and self do not add corresponding multicast group, add this multicast group, send BCMCS data flow according to described multicast information table by IP multicast mode;

BSC/PCF, is further used for determining receiving after igmp querying, if there is MS receiving BCMCS data flow, returns to corresponding IGMP report to BSN; If do not have MS to receive BCMCS data flow, do not return to IGMP report, and delete the multicast group information corresponding with this program in the multicast information table of self maintained, exit described multicast group.

In practical application, MS receives the broadcast from BSC/PCF, and user selects the program of liking, and MS initiates BCMCS registration request, sends the registration request that carries authentication information to BSC/PCF; BSC/PCF sends the service request of carrying authentication information according to the log-on message receiving to BSN; BSN dials in service to SAAA/BCMCS Controller remote validation user and sends access request, and SAAA/BCMCS Controller returns to access acceptance response by the backward BSN of authentication; BSN determines whether to have created multicast group for the selected program of MS, if for this program has created a multicast group, BSN extracts the multicast group information corresponding with this program, adds in the service response of returning to BSC/PCF, responds to BSC/PCF return service; If not for this program creates multicast group, BSN, for this program creates a multicast group, after having created, adds corresponding multicast group information in the response of BSC/PCF return service, responds to BSC/PCF return service; BSC/PCF extracts multicast group information after receiving service response, determine whether to add the corresponding multicast group of this multicast group information, if do not add this multicast group, extracted multicast group information is added in the multicast information table of self safeguarding, add this multicast group, and sending the IGMP report that adds this multicast group to the network between BSN and BSC/PCF, self has added this multicast group the equipment on informing network, and sends BCMCS registration request to BSN; If BSC/PCF has added the multicast group that this program is corresponding, do not send IGMP report to the network between BSN and BSC/PCF, directly send BCMCS registration request to BSN, require BSN to set up A10 passage;

BSN creates the backward BSC/PCF of A10 passage and returns to registration request and reply; After BSC/PCF receives that registration request that BSN returns is replied, send registration accept message to MS, notice subscription authentication is passed through; The BCMCS data flow of this program that BSN comes BCMCS server sends to BSC/PCF by the mode of multicast; In BCMCS data stream transmitting process, BSN regularly sends igmp querying to BSC/PCF, determines whether the BCMCS data flow of the program that BSC/PCF carries in forwarding multicasting group in addition.

In the time that BSC/PCF receives the igmp querying of BSN transmission, if also have MS below BSC/PCF in the BCMCS data flow that receives this program, BSC/PCF returns to an IGMP report to BSN; Otherwise BSC/PCF does not return to IGMP report, and delete the multicast group information corresponding with this program in the multicast information table of self maintained, exit described multicast group; Therefore, if receiving the IGMP that BSC/PCF returns at the appointed time, BSN comprises, determine and also have BSC/PCF in the BCMCS data flow that forwards this multicast group carrying, the multicast information table that continues to safeguard according to self sends BCMCS data flow by IP multicast mode; If do not receive at the appointed time the IGMP report that BSC/PCF returns, determine the BCMCS data flow that there is no the program that BSC/PCF carries in forwarding multicasting group, the bearer path between BSN request release self and BSC/PCF, meanwhile, BSN deletes the multicast information table multicast group information corresponding with this program of self maintained.

The above, be only preferred embodiment of the present invention, is not intended to limit protection scope of the present invention, all any amendments of doing within the spirit and principles in the present invention, is equal to and replaces and improvement etc., within all should being included in protection scope of the present invention.

Claims (9)

1. the method for data stream transmitting in a broadcast multi-broadcasting service BCMCS system, it is characterized in that, the multicast information table that BCMCS serving node B SN safeguards according to self sends to base station controller/packet data control BSC/PCF by procotol IP multicast mode by BCMCS data flow, and BSC/PCF forwards the BCMCS data flow receiving by IP multicast mode according to the multicast information table of self;

The multicast information table that described BSN safeguards according to self sends BCMCS data flow by IP multicast mode, comprise: BSN judges whether for the selected program of MS creates multicast group, if while not creating multicast group for this program, it in described multicast information table, is this program establishment multicast group, send BCMCS data flow according to described multicast group information by IP multicast mode, and send multicast group information to BSC/PCF; If, for this program creates multicast group, send BCMCS data flow according to described multicast group information by IP multicast mode, and send multicast group information to BCS/PCF;

Wherein, described multicast group information comprises: in multicast information table the multicast address corresponding with this program and with the key assignments GRE KEY of Generic Routing Encapsulation corresponding to this multicast.

2. method according to claim 1, is characterized in that, described multicast information table comprises program ID and multicast group information, the key assignments GRE KEY that described multicast group information comprises multicast address and Generic Routing Encapsulation corresponding to this multicast;

Described BSN judges whether to be specially for the selected program of MS creates multicast group: BSN inquires about according to the program address ID receiving the multicast information table of self safeguarding, check and whether have the multicast group information corresponding with this program ID, if existed, determine to be that described program creates multicast group; If there is no, determine not to be that described program creates multicast group; And/or,

Describedly in described multicast information table, be specially for program creates multicast group: BSN selects idle multicast address and an idle GRE KEY to create a multicast group, this multicast group in described multicast information table taking the program ID of this program as index.

3. method according to claim 1, is characterized in that, described BSC/PCF sends BCMCS data flow according to the multicast information table of self by IP multicast mode, comprising:

The multicast group information that BSC/PCF sends according to BSN, inquire about in the multicast information table of self safeguarding and whether have this multicast group information, if existed, determine and self added corresponding multicast group, send BCMCS data flow according to described multicast information table by IP multicast mode; If there is no, determine and self do not add corresponding multicast group, add this multicast group, send BCMCS data flow according to described multicast information table by IP multicast mode.

4. method according to claim 3, it is characterized in that, the described multicast group that adds is specially: the multicast group information receiving is added in the multicast information table of self safeguarding, and send the IGMP IGMP report that adds this multicast group to the network between BSN and BSC/PCF, notify the equipment self on this network to add this multicast group.

5. method according to claim 1, is characterized in that, in described BCMCS data stream transmitting process, the method further comprises:

BSN sends igmp querying to BSC/PCF, determines whether the BCMCS data flow of the program that BSC/PCF carries in forwarding multicasting group in addition, if had, the multicast information table that continues to safeguard according to self sends BCMCS data flow by IP multicast mode; Otherwise, discharge the bearer path between BSN and BSC/PCF, finish the transmission of BCMCS data flow.

6. method according to claim 5, is characterized in that,

Described after BSC/PCF sends igmp querying, further comprise: in the time that BSC/PCF receives igmp querying, if also have MS below BSC/PCF in the BCMCS data flow that receives this program, BSC/PCF returns to IGMP report to BSN; Otherwise BSC/PCF does not return to IGMP report, and delete the multicast group information corresponding with this program in the multicast information table of self maintained, exit described multicast group;

The described BCMCS data flow that determines whether the program that BSC/PCF carries in forwarding multicasting group in addition, be specially: if receive the IGMP report that BSC/PCF returns at the appointed time, define the BCMCS data flow of the program that BSC/PCF carries in forwarding multicasting group, the multicast information table that continues to safeguard according to self sends BCMCS data flow by IP multicast mode; If do not receive the IGMP report that BSC/PCF returns at the appointed time, determine the BCMCS data flow that there is no the program that BSC/PCF carries in forwarding multicasting group, the bearer path between BSN request release self and BSC/PCF, meanwhile, the multicast group information corresponding with this program in the multicast information table of BSN deletion self maintained.

7. realize a system for data stream transmitting in BCMCS system, this system comprises: BSC/PCF, BSN; It is characterized in that,

BSN, sends to BSC/PCF by IP multicast mode by BCMCS data flow for the multicast information table according to self; The described multicast information table according to self sends to BSC/PCF by IP multicast mode by BCMCS data flow, comprise: BSN judges whether for the selected program of MS creates multicast group, if while not creating multicast group for this program, it in described multicast information table, is this program establishment multicast group, send BCMCS data flow according to described multicast group information by IP multicast mode, and send multicast group information to BSC/PCF; If, for this program creates multicast group, send BCMCS data flow according to described multicast group information by IP multicast mode, and send multicast group information to BSC/PCF; Wherein, described multicast group information comprises: in multicast information table the multicast address corresponding with this program and with the key assignments GRE KEY of Generic Routing Encapsulation corresponding to this multicast;

BSC/PCF, for sending the BCMCS data flow receiving by IP multicast mode according to the multicast information table of self.

8. system according to claim 7, it is characterized in that, described BSN is further used for sending igmp querying to BSC/PCF, determine while not receiving at the appointed time the corresponding IGMP report that BSC/PCF returns, bearer path between request release self and BSC/PCF, deletes corresponding multicast group information.

9. according to the system described in claim 7 or 8, it is characterized in that,

Described BSC/PCF is for sending the BCMCS data flow receiving by IP multicast mode according to the multicast information table of self, be specially: the multicast group information that BSC/PCF sends according to BSN, inquire about in the multicast information table of self safeguarding and whether have this multicast group information, if existed, determine and self added corresponding multicast group, send BCMCS data flow according to described multicast information table by IP multicast mode; If there is no, determine and self do not add corresponding multicast group, add this multicast group, send BCMCS data flow according to described multicast information table by IP multicast mode; And/or,

Described BSC/PCF is further used for receiving after igmp querying, if there is MS to receive BCMCS data flow, returns to IGMP report to BSN; If do not have MS to receive BCMCS data flow, do not return to IGMP report, and delete the multicast group information corresponding with this program in the multicast information table of self maintained, exit described multicast group.