CN101170742B - A method for transmitting multicast broadcast programs in radio access network - Google Patents
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Abstract
The invention discloses a transmission method of multicast broadcast program in a wireless access network. During the process of establishing a multicast broadcast program connection, a program processing module inside a base station controller (BSC) notifies a base station (BS) interface board needing to receive the program stream to be added a first IGMP group corresponding to the program, the multicast address of the first IGMP group being a first multicast address; after receiving the program stream data of the program, adding the BSC interface board corresponding to the BS interface board of the first multicast address, to package the program stream data into a first IGMP multicast packet with the first multicast address as target address, and sending the packet to the BS interface board added in the first IGMP group. The inventive method reduces the transmission load of multicast broadcast program in the wireless access network, reduces the redundancy of multicast broadcast program stream inside RAN, and increases the capacity of RAN network.
Description
Technical field
The present invention relates to the communications field, relate in particular in a kind of wireless telecommunications Access Network, multicast and broadcast service (BroadCast MultiCast Service) program is at BSC (Base Station Controller, base station controller) inside, and the sending method between BSC and the BS (Base Station, base station).
Background technology
In the wireless telecommunication system of supporting the multicast and broadcast service, a multicast broadcast program sends to mobile phone from program source, needs through program source server, multicast and broadcast service node (BSN), Radio Access Network (RAN), passes through aerial mouthful of arrival mobile phone again.RAN has comprised BSC and some BS again.After BSN sent to the BSC of RAN with one road program, BSC sent to program the BS that is had jurisdiction over.
In order to realize the multicast and broadcast of program, BSC will be sent to a plurality of BS to one road program by interface board.The BSC of high power capacity can dispose a plurality of BS interface boards usually in order to articulate more BS.Whole BSC can articulate the maximum number of BS, and interface board can articulate the number of BS exactly, multiply by the interface board number of BSC configuration.
In BSC inside, one road multicast broadcast program wants to be sent to all BS, and the broadcast program source of BSC inside must be sent to one road program all BSC interface boards.Suppose that BSC interface board quantity is n, the broadcast program quantity that BSC initiates is m, n * m road program is then arranged in transmission in BSC inside.At this moment, (n-1) * m road program of BSC internal transmission is redundant, and same road program has sent repeatedly.Just, program stream is sent to each interface board under point-to-point transmission means.Under the bigger situation of the value of n, the bandwidth that the transmission of BSC built-in redundancy takies is also just very big.
BSC need send a multicast broadcast program for each BS by the BSC interface board for one road program is dealt into all BS.Suppose that the BSC interface board has disposed k BS, the broadcast program quantity that BSC initiates is m.Then between BSC interface board and all BS, there be k * m program transmitting.At this moment, it is redundant (k-1) * m road program being arranged between BSC interface board and all BS.Under the extensive network planning that covers, the redundant transmitted traffic of multicast broadcast program between BSC and BS also is huge.
Because the redundancy of broadcast program sends, the disposal ability of RAN does not have and can rationally utilize, and has reduced the power system capacity of RAN.
In Chinese patent CN02119110, mentioned a kind of grouped data communication apparatus implementation, but do not proposed to solve the method for redundant transmission with multicast and broadcast function.
In Chinese patent CN01130877, mentioned a kind of wireless access network implementation with multicast and broadcast function.It has proposed a kind of method to reduce the redundant transmission of a plurality of multicast control modules under radio network controller to a BS.But this method do not solve the inner same program redundant transmission of BSC problem; There is not to consider fully the problem of minimizing redundant transmission between BSC and BS yet.
Summary of the invention
The technical problem to be solved in the present invention provides the sending method of multicast broadcast program in a kind of wireless access network, reduces the transmission load of multicast broadcast program in the wireless access network, reduces the redundancy of the inner multicast broadcast program stream of RAN, improves the network capacity of RAN.
In order to address the above problem, the invention provides the sending method of multicast broadcast program in a kind of wireless access network, may further comprise the steps:
(1) connect in the process of setting up at a multicast broadcast program, the program processing module of BSC inside notice needs the BS interface board of this program stream of reception to add the IGMP group of this program correspondence; The multicast address of the one IGMP group is first multicast address;
(2) receive the program stream data of this program after, the pairing BSC interface board of BS interface board that adds IGMP group is packaged into the IGMP multicast message that destination address is described first multicast address with this program stream data, and the BS interface board of this message to described adding the one IGMP group sent.
Further, said method also can have following characteristics: described program processing module determines that according to the configuration of database needs receive the BS interface board of this program stream.
Further, said method also can have following characteristics: step (1) further can be divided into following steps:
(101) connect in the process of setting up at multicast broadcast program, the BS interface board that described program processing module receives this program stream to needs sends first multicast group message that joins request, and this first multicast joins request and comprises described first multicast address in the message;
(102) receive the join request BS interface board of message of described first multicast group, add described IGMP group, and first multicast group is added the result return to described program processing module by described first multicast address;
(103) described program processing module determines that according to described first multicast group adding result who receives the BS interface board adds described IGMP group.
Further, said method also can have following characteristics: in the step (101), described program processing module starts adding multicast group timer and picks up counting when described first multicast group of transmission joins request message; In the step (103), add the result, determine that then this BS interface board adds described IGMP group if described program processing module receives described first multicast group in the timing cycle that described timer is set.
Further, said method also can have following characteristics: step also comprises after (103):
(104) described program processing module is initiated second multicast group message that joins request to the pairing BSC interface board of BS interface board that adds IGMP group, this second multicast group the 2nd IGMP that comprises this program correspondence in the message that joins request organizes corresponding second multicast address, and the program set of this program numbering and corresponding first multicast address;
(105) described BSC interface board receives described second multicast group and joins request after the message, adds the 2nd IGMP group of this program correspondence by described second multicast address, and second multicast group is added the result returns to described program processing module;
(106) after described program connection foundation was finished, described program processing module was packaged into the 2nd IGMP multicast message that destination address is described second multicast address with program stream data, and the BSC interface board of this message to described adding the 2nd IGMP group sent.
Further, said method also can have following characteristics: after described program connection foundation was finished, the BSC interface board of described adding the 2nd IGMP group was according to corresponding first multicast address of described program set numbering this program of inquiry.
The present invention also provides the sending method of multicast broadcast program in the another kind of wireless access network, may further comprise the steps:
(a) connect in the process of setting up at a multicast broadcast program, the program processing module of BSC inside notice needs the BSC interface board of this program stream of forwarding to add the IGMP group of this program correspondence;
(b) after described program connection foundation was finished, described program processing module was packaged into the IGMP multicast message with program stream, and the multicast address of this IGMP group is sent on BSC internal network bus as destination address.
Further, said method also can have following characteristics: described program processing module determines that according to the configuration of database needs receive the BS interface board of this program stream; And the situation of the BSC interface board that is connected according to described BS interface board, and the situation of load sharing determines to need to transmit the BSC interface board of this program stream.
Further, said method also can have following characteristics: if having only a BSC interface board to be connected with the described BS interface board that needs to receive this program stream, then described program processing module determines that this BSC interface board is the described BSC interface board that needs to transmit this program stream; If there are a plurality of BSC interface boards to be connected with the described BS interface board that needs to receive this program stream, then described program processing module determines that the lightest BSC interface board of load is the described BSC interface board that needs to transmit this program stream.
Further, said method also can have following characteristics: described program processing module is organized by its IGMP that adds this program correspondence of message informing that joins request to the described BSC interface board transmission multicast group that need transmit this program stream.
The present invention proposes a kind of IGMP of utilization agreement (Internet Group Management Protocol, the Internet igmpinternet) in the inner method that reduces the redundant transmission of multicast broadcast program stream of BSC, and a kind of redundant method that sends of multicast broadcast program stream that between BSC and BS, reduces.Compared with prior art, the present invention saved in BSC inside, from the program processing module to the BSC interface board, and bandwidth resources between BSC and the BS.
Description of drawings
Fig. 1 is for supporting the wireless telecommunications access network architecture figure of multicast broadcast service function;
Fig. 2 sets up the flow chart of process for the multicast broadcast program of first embodiment of the invention;
Fig. 3 sets up the flow chart of process for the multicast broadcast program of second embodiment of the invention;
Fig. 4 sets up the flow chart of process for the multicast broadcast program of third embodiment of the invention;
Fig. 5 is the structure chart of the embodiment of the invention, and the BSC interface board links to each other with BS by network independently separately;
Fig. 6 is the structure chart of the embodiment of the invention, and the BSC interface board links to each other with BS by interconnected network and realizes load sharing.
Embodiment
In BSC inside a module of handling the multicast broadcast program stream is arranged, be responsible for receiving multicast broadcast program from core net BSN.With the multicast and broadcast service on CDMA 1xEV-DO (the CDMA group data service evolution standard) basis is example, the multicast broadcast program processing module of BSC inside (being also referred to as the program processing module herein) is stipulated according to agreement, the multicast broadcast program stream that core net enters is encoded, MAC (Media Access Control, medium access address) the layer packet format tissue of programme content by the agreement regulation.After data set weaves, the program processing module is by certain time sequence, program stream is sent to BS interface board on the BS by the BSC interface board, the program stream that the BS interface board is responsible for receiving is transmitted to the Channel Elements of BS, Channel Elements by BS is modulated into the aerial mouthful signal of CDMA 1xEV-DO again, sends to terminal.
Referring to Fig. 1, the respectively corresponding program processing module of each program, the program processing module sends to the BSC interface board by the BSC internal bus with program stream, send to the BS interface board by the BSC interface board again, when sending, all that program stream need be sent on the BSC need be transmitted the interface board of program stream, and as shown in Figure 1, the BSC interface board sends to the BS that all need receive this program by Ethernet with program again.
If will send to a plurality of BSC interface boards at inner one road program of BSC, redundant transmission will produce, and along with the increase of number of programs, redundancy more can be multiplied.Send the flow load that program flows to many interface boards of BSC in order to reduce in BSC inside from a program processing module, the program processing module among the present invention is to send program stream with the IGMP multicast mode.And all need transmit the BSC interface board of program stream, also must join same IGMP group in order to receive this program stream, and the multicast address of this IGMP group is notified the BSC interface board by the program processing module when connection is set up.
Similarly, redundant to the link between the BS in order to be reduced in BSC, the BSC interface board among the present invention is to send program stream with the IGMP multicast mode.All need the BS interface board of program receiving stream, also must join specific I GMP group in order to receive this program stream, and the multicast address of this IGMP group is when connection is set up, by program processing module notice BSC interface board.
Below in conjunction with the drawings and specific embodiments the present invention is described in further detail.
Embodiment one
Sending method in the inner reduction redundancy of BSC:
Send the flow load that program flows to many interface boards of BSC in order to reduce from a multicast broadcast program processing module in BSC inside, setting up in the process of a multicast broadcast program, need the program processing module of this program to plan its affiliated IGMP group, and notify the BSC interface board that needs this program stream of forwarding to add this IGMP and organize for this program.The multicast address of this IGMP group is notified the BSC interface board by the program processing module when the connection of multicast broadcast program is set up.
As shown in Figure 2, set up in the process, may further comprise the steps in the connection of program:
Step 21, the multicast broadcast program processing module sends the multicast group message that joins request to the BSC interface board that needs the forwarding multicasting broadcast program, comprises the multicast address and the program set ID (numbering) of the IGMP group of this program correspondence in this request message;
The program processing module finds that according to the configuration of background data base the BS that program will send to can arrive by certain BSC interface board, and the program processing module just selects this interface board to transmit program stream so; If program can arrive by several BSC interface boards, select the lightest BSC interface board of certain load to transmit according to the principle of load balance so.
Step 22 is received the join request BSC interface board of message of multicast group, and multicast address on request adds the IGMP group, and returns multicast group to the program processing module add the result in receiveing the response.
Set up in the process in connection, the program processing module can also be provided with multicast group and add timer, and the program processing module starts timer and picks up counting when the transmission multicast group joins request message; If the timing cycle (T that the program processing module is set at timer
Multicast group adds timer) in receive multicast group and add the result, determine that then this BSC interface board is a target BS C interface plate.
The BSC interface board just can receive follow-up program stream of coming from the multicast broadcast program processing module after adding the IGMP group of program correspondence.
After the connection of program is set up and is finished, when this playing programs, as shown in Figure 1, program 1, program 2 and program 3 that program processing module 1, program processing module 2 and program processing module 3 respectively corresponding core net send.Each program processing module sends the program stream that is encapsulated by multicast message by the BSC internal bus, and only sends a.The address of multicast message promptly is when connection is set up, and the program processing module sends to the multicast address in the multicast group request message of BSC interface board.The BSC interface board that has added the multicast group of program correspondence can monitor and receive the message of own affiliated IGMP group on internal bus.Therefore, the program stream with the encapsulation of IGMP message format only sends a a plurality of BSC interface boards that need to transmit program that also can arrive.
Embodiment two
On the link between BSC and the BS, reduce redundant sending method:
Adopt between BSC and the BS under the networking mode that Ethernet is connected, the BSC interface board can be routed to the interface board of BS under the situation of networking assurance.Therefore, an IGMP group can be passed Ethernet and be arrived target network element.In Ethernet inside, cross over router and set up the process and method of IGMP group path not within the declared range of this patent.
As shown in Figure 3, set up in the process, may further comprise the steps in the connection of multicast broadcast program:
Step 31, the BS that the program processing module relates to multicast broadcast program (promptly needing to receive the BS of this program) sends the multicast group message that joins request, and this request message sends on the interface board of BS, comprises the multicast address of the IGMP group of this program correspondence in the message;
Step 32, after the BS interface board received that multicast group joins request, multicast address on request added the IGMP group of multicast broadcast program correspondence, and returned multicast group adding result to the program processing module in receiveing the response;
The program processing module found that target BS according to the multicast group adding that receives the BS interface board, then, the program processing module connects the situation of BSC interface board according to the target BS of certain program, and the situation of load sharing is judged and need to be determined the BSC interface board transmitted.If have only a BSC interface board and certain target BS at same network, then can only select this BSC interface board; If a plurality of BSC interface boards are arranged with it on same network, so, select the lightest BSC interface board of load.As shown in Figure 5, BS1, BS2 are target BS, BS1 and BS2 only with BSC interface board 1 at same network (Ethernet 1), then determine the BSC interface board of BSC interface board 1 for needing to transmit; And in Fig. 6, BS1 and BS2 and BSC interface board 1 and BSC interface board 2 be at same network (Ethernet 1), then the BSC interface board of selecting the light conduct of load to transmit from BSC interface board 1 and BSC interface board 2.
Set up in the process in connection, the program processing module can also be provided with multicast group and add timer, and the program processing module starts timer and picks up counting when the transmission multicast group joins request message; If the timing cycle (T that the program processing module is set at timer
Multicast group adds timer) in receive multicast group and add the result, determine that then this BS interface board is the target BS interface board.
All BS that relate to repeat top step to this program, transmit the BSC interface board tabulation of this program stream up to selecting the needs that can arrive all BS.
Step 33, the BSC interface board that the program processing module is transmitted this program stream to needs sends multicast discovery notification message;
The BSC interface board that the program processing module is transmitted this program stream according to the tabulation of above-mentioned BSC interface board to needs sends multicast and finds notification message, finds in the notification message that at multicast multicast address with the target BS of the program set numbering of this program and its discovery is notified to the BSC interface board in the tabulation.
Step 34, the BSC interface board sends multicast to the program processing module and finds receiveing the response of notification message.
Be the flow process of example explanation present embodiment playing programs below with Fig. 5.The difference of Fig. 5 and Fig. 6 is that BSC interface board 2 is the backup of BSC interface board 1 among Fig. 6.
After the program connection is set up and is finished, in the playing process of program, as shown in Figure 5, the program 1 that comes from core net sends on the program processing module 1 of this program correspondence, BSC interface board 1 and BSC interface board 3 are received data behind this program stream of sending from program processing module 1 from the BSC internal bus, can be respectively according to the corresponding target BS multicast address of program set numbering inquiry, and program stream data is packaged into multicast message, the multicast address of message is the multicast address of target BS, transmits this program by Ethernet again and flows to BS.
The program stream that 1 need of BSC interface board are transmitted needs is a to Ethernet 1 with the form transmission of multicast message, and the multicast address of this message promptly connects the multicast address of the target BS (BS1, BS2) of program processing module notice BS interface board 1 when setting up.Like this, just only need to send a program stream data with the encapsulation of IGMP message from BSC interface board 1 to BS1 and BS2, rather than all send a program stream to each BS, the target BS interface board in the same network can both receive this program stream.Similarly, BSC interface board 3 sends to target BS 3 with program stream by Ethernet 2 with the form of multicast message.
When the target BS interface board is received the message of IGMP group in this program stream place on the Ethernet, just receive.In BS inside, also can carry out verification, and do further processing the legitimacy of program stream.
Embodiment three
On the link between BSC inside and BSC and the BS, reduce redundant sending method simultaneously:
Setting up in the process of a multicast broadcast program, need the program processing module of this program to plan its corresponding IGMP group for this program, and the BS interface board of notifying all need receive this program stream adds the IGMP group of this program correspondence, and the notice BSC interface board that needs to transmit program stream also adds specific I GMP group simultaneously.As shown in Figure 4, set up in the process at program, relevant control flow may further comprise the steps:
Step 41, the multicast broadcast program processing module, the BS (promptly needing to receive the BS of this program) that relates to multicast broadcast program sends first multicast group message that joins request, this request message sends on the interface board of BS, comprises the affiliated first corresponding multicast address of IGMP group of this program in the message.
Step 42 is received the BS interface board that first multicast group joins request, and first multicast address on request adds IGMP group, and returns first multicast group adding result in receiveing the response.
The BS interface board just can receive the follow-up program stream that forwards from the BSC interface board after adding this IGMP group.
Step 43, the multicast broadcast program processing module, send second multicast group message that joins request to the BSC interface board that needs the forwarding multicasting broadcast program, comprise corresponding first multicast address and the program set ID (numbering) of IGMP group under this program in this request message; And second multicast address.
The BSC interface board that needs the forwarding multicasting broadcast program is that the program processing module is determined by the multicast group adding result that BS returns.That is, the program processing module is determined corresponding BSC interface board according to the target BS interface board after receiving that multicast group adds the result, so that transmit program stream.
In the present embodiment, as shown in Figure 4, the program processing module joins request in the message sending first multicast group to the BS interface board, starts to add the multicast group timer and pick up counting; If timing cycle (T in the timer setting
Add the multicast group timer) in receive described first multicast group and add the result, determine that then this BS interface board has added first multicast group, the BSC interface board of this BS interface board correspondence is for needing to transmit the BSC interface board of program stream.
Step 44 is received the join request BSC interface board of message of second multicast, and second multicast address on request adds the 2nd IGMP group, and returns second multicast group add the result in receiveing the response.
The BSC interface board just can receive follow-up program stream of coming from the multicast broadcast program processing module after adding the 2nd IGMP group.
The program processing module joins request in the message sending second multicast group to the BS interface board, starts to add the multicast group timer and pick up counting; If timing cycle (T in the timer setting
Add the multicast group timer) in receive second multicast group and add the result, determine that then this BS interface board has added the 2nd IGMP group.
Then, the BSC interface board is recorded in its forwarding-table item according to second multicast join request the program set numbering and first multicast address in the message; In this playing programs process, after program stream arrived the BSC interface board, the BSC interface board was according to corresponding first multicast address of program set numbering inquiry; And with this first multicast address as destination address, construct multicast message then and transmit program stream to the BS interface board.
Be the flow process of example explanation present embodiment playing programs below with Fig. 5.The difference of Fig. 5 and Fig. 6 is that BSC interface board 2 is the backup of BSC interface board 1 among Fig. 6.
The program that comes from core net sends on the pairing program processing module 1 of this program, and the latter is packaged into the 2nd IGMP multicast message with program stream, message address be this program when connection is set up, second multicast address that request BSC interface board adds.
Because the characteristic of multicast, the BSC internal interface can both be received this multicast message at all network elements of internal bus 32, but has only the network element that has added certain multicast group can receive the message of this multicast group.Because all the BSC interface boards 33 that need transmit program stream have all added the 2nd IGMP multicast group, thus they internally bus interface receive the data message of this multicast group.Like this, the program processing module only sends a program stream and just can arrive all BSC interface boards.
As shown in Figure 5, each BSC interface board is by independently network is interconnected with the BS that hangs down separately.At this moment, the program stream that the BSC interface board will be transmitted is packaged into first multicast message and sends a network between BSC and BS.The multicast address of first multicast message is to set up in the process in the connection of program, first multicast address that program processing module notification target BS interface board adds.The BS interface board can monitor and receive the own multicast message that adds an IGMP multicast group on network.Like this, all target BS of same network can both be received this program stream.
Basic thought of the present invention can also be realized by other different approach.The example of the communication system of describing above the present invention and embodiment are not limited to.But can change in the scope of claims.
Claims (10)
1. the sending method of multicast broadcast program in the wireless access network may further comprise the steps:
(1) connect in the process of setting up at a multicast broadcast program, the program processing module of BSC inside notice needs the BS interface board of this program stream of reception to add the IGMP group of this program correspondence; The multicast address of the one IGMP group is first multicast address;
(2) receive the program stream data of this program after, the pairing BSC interface board of BS interface board that adds IGMP group is packaged into the IGMP multicast message that destination address is described first multicast address with this program stream data, and the BS interface board of this message to described adding the one IGMP group sent.
2. the method for claim 1 is characterized in that, described program processing module determines that according to the configuration of database needs receive the BS interface board of this program stream.
3. the method for claim 1 is characterized in that, step (1) further can be divided into following steps:
(101) connect in the process of setting up at multicast broadcast program, the BS interface board that described program processing module receives this program stream to needs sends first multicast group message that joins request, and this first multicast joins request and comprises described first multicast address in the message;
(102) receive the join request BS interface board of message of described first multicast group, add described IGMP group, and first multicast group is added the result return to described program processing module by described first multicast address;
(103) described program processing module determines that according to described first multicast group adding result who receives the BS interface board adds described IGMP group.
4. method as claimed in claim 3 is characterized in that, in the step (101), described program processing module starts adding multicast group timer and picks up counting when described first multicast group of transmission joins request message; In the step (103), add the result, determine that then this BS interface board adds described IGMP group if described program processing module receives described first multicast group in the timing cycle that described timer is set.
5. method as claimed in claim 3 is characterized in that, step also comprises after (103):
(104) described program processing module is initiated second multicast group message that joins request to the pairing BSC interface board of BS interface board that adds IGMP group, this second multicast group the 2nd IGMP that comprises this program correspondence in the message that joins request organizes corresponding second multicast address, and the program set of this program numbering and corresponding first multicast address;
(105) described BSC interface board receives described second multicast group and joins request after the message, adds the 2nd IGMP group of this program correspondence by described second multicast address, and second multicast group is added the result returns to described program processing module;
(106) after described program connection foundation was finished, described program processing module was packaged into the 2nd IGMP multicast message that destination address is described second multicast address with program stream data, and the BSC interface board of this message to described adding the 2nd IGMP group sent.
6. method as claimed in claim 5 is characterized in that, after described program connection foundation was finished, the BSC interface board of described adding the 2nd IGMP group was according to corresponding first multicast address of described program set numbering this program of inquiry.
7. the sending method of multicast broadcast program in the wireless access network may further comprise the steps:
(a) connect in the process of setting up at a multicast broadcast program, the program processing module of BSC inside notice needs the BSC interface board of this program stream of forwarding to add the IGMP group of this program correspondence;
(b) after described program connection foundation was finished, described program processing module was packaged into the IGMP multicast message with program stream, and the multicast address of this IGMP group is sent on BSC internal network bus as destination address.
8. method as claimed in claim 7 is characterized in that, described program processing module determines that according to the configuration of database needs receive the BS interface board of this program stream; And the situation of the BSC interface board that is connected according to described BS interface board, and the situation of load sharing determines to need to transmit the BSC interface board of this program stream.
9. method as claimed in claim 8, it is characterized in that, if have only a BSC interface board to be connected with the described BS interface board that needs to receive this program stream, then described program processing module determines that this BSC interface board is the described BSC interface board that needs to transmit this program stream; If there are a plurality of BSC interface boards to be connected with the described BS interface board that needs to receive this program stream, then described program processing module determines that the lightest BSC interface board of load is the described BSC interface board that needs to transmit this program stream.
10. method as claimed in claim 7 is characterized in that, described program processing module is organized by its IGMP that adds this program correspondence of message informing that joins request to the described BSC interface board transmission multicast group that need transmit this program stream.
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| CN101170742A (en) | 2008-04-30 |
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