CN101924910B

CN101924910B - Data sending method, receiving method and device during channel switching process

Info

Publication number: CN101924910B
Application number: CN200910086981A
Authority: CN
Inventors: 陈光海; 邸佩云; 许阳坡; 邹子轩; 刘欣
Original assignee: Huawei Technologies Co Ltd
Current assignee: Honor Device Co Ltd
Priority date: 2009-06-12
Filing date: 2009-06-12
Publication date: 2012-10-03
Anticipated expiration: 2029-06-12
Also published as: CN101924910A

Abstract

The embodiment of the invention provides a data sending method, a receiving method and a device during the channel switching process, and a channel switching server sends data packets to clients through the multicast way during the channel switching process and simultaneously carries out unicast data sending against different clients, thereby fully utilizing free bandwidth of different users to quickly complete channel switching, leading the high-speed users to fully utilize the free bandwidth to fill up a channel switching buffer area in advance, further completing the channel switching and upgrading the channel switching video quality, simultaneously not affecting the low-speed user services and reflecting the differentiated services for the users.

Description

Data transmission method for uplink and method of reseptance and device in the channel handoff procedure

Technical field

The embodiment of the invention relates to does not have the letter communication technical field, relates in particular to data transmission method for uplink and method of reseptance and device in a kind of channel handoff procedure.

Background technology

At Web TV (Internet Protocol Television; Hereinafter to be referred as: IPTV) in the service, the channel switch speed is an important indicator that influences service quality.The time that channel switches is to send channel switching instruction is watched the new channel content to the user time from the user.After different STBs sent channel switching instruction, a plurality of STBs sent channel switch request in the same period to the channel switching server that channel switching service is provided at different user; After this channel switching server receives user's channel switch request, response is made in a plurality of users' request, the service of new channel is provided to a plurality of users through the form of multicast simultaneously; The multiplexing multi-broadcast group that inserts channel switching server the user switches in the original multi-broadcast group of the media server that initial data is provided after a period of time again, accomplishes channel and switches.

Fast channel at IPTV switches (Fast Channel Change; Hereinafter to be referred as: FCC) in the business; Channel switching server provides at least one and native multicasting stream to exist the multiplexing multicast data flow of time delay to come for the user channel switching service to be provided; Wherein native multicasting stream sends through original multi-broadcast group broadcasting, and multiplexing multicast data flow is sent through multiplexing multi-broadcast group broadcasting.Receive user's channel switch request when channel switching server after,, select a suitable multiplexing multi-broadcast group to come service to be provided for the user through analyzing the multiplexing multicast data flow that has time delay with native multicasting stream.

In realizing process of the present invention; The inventor finds to exist at least in the prior art following problem: a period of time just can be left multiplexing multi-broadcast group afterwards because client is adding original multi-broadcast group; Therefore client adds original multi-broadcast group after for some time in, have on the independent link of client that native multicasting flows and twice data flow such as multiplexing multicast data flow.Under the band-limited condition of client, data-bag lost can take place, influence the channel switching service quality.In addition, existing multiplexing multi-broadcast group is static the existence, because multiplexing multi-broadcast group will satisfy the demand of low-rate users, therefore is not fully utilized for high its idle bandwidth of client of bandwidth, causes the bandwidth resources waste; And the buffering area of client can not get fast cache, and the channel Switch Video is poor.

Summary of the invention

The embodiment of the invention provides data transmission method for uplink and method of reseptance and device in a kind of channel handoff procedure, to realize making full use of of client idle bandwidth.

Data transmission method for uplink in the channel handoff procedure that the embodiment of the invention provides comprises:

Channel switching server is according to channel switch request, send with the form of multiplexing multicast data flow in the process of packet of target channel to client through multiplexing multi-broadcast group; Be used to ask said client to receive the unitcast request message of the packet of said target channel through mode of unicast to said client transmission, said unitcast request message comprises first start sequence number of the packet that sends through mode of unicast; Said multiplexing multi-broadcast group is that said channel switching server supplies said client to carry out that channel switch request is professional to be set up, and said multiplexing multicast data flow and native multicasting flow and have time delay;

Said channel switching server after the affirmation response that receives the said unitcast request message that said client returns, the packet that sends sequence number and begin to said client through mode of unicast from said first start sequence number.

Data receive method in the channel handoff procedure that the embodiment of the invention provides comprises:

Send channel switch request to channel switching server and supplying client to carry out in the process of packet of the professional multiplexing multi-broadcast group receiving target channel of setting up of channel switch request through said channel switching server; Receive that said channel switching server sends, be used for requesting client receives the packet of said target channel through mode of unicast unitcast request message, said unitcast request message comprises first start sequence number of the packet that said channel switching server sends through mode of unicast; Said channel switching server sends the packet of said target channel with the form of multiplexing multicast data flow, and there are time delay in said multiplexing multicast data flow and native multicasting stream;

After affirmation response from said unitcast request message to said channel switching server that return, receive the packet that sequence number that said channel switching server sends begins from said first start sequence number through mode of unicast.

The channel switching server that the embodiment of the invention provides comprises:

First processing module; Be used in the process of sending the packet of target channel according to channel switch request, through multiplexing multi-broadcast group to client with the form of multiplexing multicast data flow; Be used to ask said client to receive the unitcast request message of the packet of said target channel through mode of unicast to said client transmission, said unitcast request message comprises first start sequence number of the packet that sends through mode of unicast; Said multiplexing multi-broadcast group is that said channel switching server supplies said client to carry out that channel switch request is professional to be set up, and said multiplexing multicast data flow and native multicasting flow and have time delay;

Second processing module is used for after the affirmation response that receives the said unitcast request message that said client returns, the packet that sends sequence number and begin from said first start sequence number to said client through mode of unicast.

The client that the embodiment of the invention provides comprises:

Manages module everywhere; Be used for sending channel switch request to channel switching server and supplying client to carry out the process of the packet of the professional multiplexing multi-broadcast group receiving target channel of setting up of channel switch request through said channel switching server; Receive that said channel switching server sends, be used for requesting client receives the packet of said target channel through mode of unicast unitcast request message, said unitcast request message comprises first start sequence number of the packet that said channel switching server sends through mode of unicast; Said channel switching server sends the packet of said target channel with the form of multiplexing multicast data flow, and there are time delay in said multiplexing multicast data flow and native multicasting stream; The 5th processing module is used for after affirmation response from said unitcast request message to said channel switching server that return, receives the packet that sequence number that said channel switching server sends begins from said first start sequence number through mode of unicast.

Data transmission method for uplink and method of reseptance, channel switching server and client in the channel handoff procedure that the embodiment of the invention provides; When in the channel handoff procedure, sending packet through the multicast mode; Also carry out unicast data to different user and send, the idle bandwidth that can make full use of different user is like this accomplished the channel switching fast; High rate user can make full use of idle bandwidth, is full of channel in advance and switches buffering area, accomplishes channel and switches, and promotes channel Switch Video quality; Do not influence simultaneously user's service to low rate; Embody user's differentiated service.

Description of drawings

In order to be illustrated more clearly in the embodiment of the invention or technical scheme of the prior art; The accompanying drawing of required use is done to introduce simply in will describing embodiment below; Obviously, the accompanying drawing in describing below only is some embodiments of the present invention, for those of ordinary skills; Under the prerequisite of not paying creative work property, can also obtain other accompanying drawing according to these accompanying drawings.

Fig. 1 is data transmission method for uplink embodiment one flow chart in the channel handoff procedure of the present invention;

Fig. 2 is data receive method embodiment one flow chart in the channel handoff procedure of the present invention;

Fig. 3 is channel handoff procedure embodiment one sketch map of the present invention;

Fig. 4 is channel handoff procedure embodiment two sketch mapes of the present invention;

Fig. 5 is channel handoff procedure embodiment three sketch mapes of the present invention;

Fig. 6 is channel switching server embodiment one structural representation of the present invention;

Fig. 7 is client implementation example one structural representation of the present invention;

Fig. 8 forms sketch map for network system embodiment of the present invention.

Embodiment

To combine the accompanying drawing in the embodiment of the invention below, the technical scheme in the embodiment of the invention is carried out clear, intactly description, obviously, described embodiment only is the present invention's part embodiment, rather than whole embodiment.Based on the embodiment among the present invention, those of ordinary skills are not making the every other embodiment that is obtained under the creative work prerequisite, all belong to the scope of the present invention's protection.

Further specify the technical scheme of the embodiment of the invention below in conjunction with accompanying drawing and specific embodiment.

In the FCC of IPTV business; Channel switching server provides at least one and native multicasting stream to exist the multiplexing multicast data flow of time delay to come for the user channel switching service to be provided; Receive user's channel switch request when channel switching server after; Through analyzing the multiplexing multicast data flow that has time delay with native multicasting stream, select a suitable multiplexing multi-broadcast group to come service to be provided for the user.Because the available bandwidth of different user is different; Therefore multiplexing multi-broadcast group will satisfy the demand of low-rate users; The transmission rate of the packet of target channel can not be too big; This can not make full use of with regard to the synchronous Internet resources of client that make bandwidth be higher than data transmission rate and cause bandwidth resources wastes, and the buffering area of client can not get fast cache, and channel Switch Video quality is relatively poor relatively.The embodiment of the invention can not provide the defective of suitable service according to the otherness of Internet resources situation and client bandwidth resources situation to prior art; Provide a solution promptly to carry out in the process of channel switching in client; Channel switching server is that client is when sending multiplexing multicast data flow through multiplexing multi-broadcast group; If all satisfying clean culture, network and client send condition; Then send the packet of target switching channels to client, and unicast data and multi-case data do not repeat through mode of unicast; And when the packet that sends through original multi-broadcast group when the packet that receives and media server was synchronous, client received native multicasting stream from the original multi-broadcast group that channel switching server switches to media server, the switching of completion channel.

Fig. 1 is data transmission method for uplink embodiment one flow chart in the channel handoff procedure of the present invention, and present embodiment is the flow process that is synchronized to original multicast FCC server side in the FCC business from the FCC multicast of one times of speed, and as shown in Figure 1, this flow process comprises the steps:

Step 100; According to channel switch request, send in the process of packet of target channel to client through multiplexing multi-broadcast group; Be used to ask said client to receive the unitcast request message of the packet of said target channel through mode of unicast to said client transmission, said unitcast request message comprises first start sequence number of the packet that sends through mode of unicast;

When client need be carried out the channel suitching type, the user sent channel switch request (also can be described as the FCC request) through IPTV network equipments such as STBs to network side, in this channel switch request, comprised the information such as sign of target channel.The channel switching server of network side; Represent channel switching server with the FCC server in the various embodiments of the present invention; After the FCC server receives the channel switch request of client transmission; According to the time that receives this channel switch request and the information such as sign of target channel; Select a multiplexing multi-broadcast group for client and the packet of target channel be provided for this client, wherein the selected multiplexing multi-broadcast group of FCC server can for before set up good multiplexing multi-broadcast group for other clients, then require client directly to add this multiplexing multi-broadcast group reception packet as if having; Certainly if the multiplexing multi-broadcast group of not set up can be used, then the FCC server can newly be set up a multiplexing multi-broadcast group for this client and supplies client to carry out that FCC is professional to be used.

After the FCC server chooses multiplexing multi-broadcast group, send the packet of target channel with the form of multiplexing multicast data flow to client through this multiplexing multi-broadcast group; Subsequently; The FCC server can send unitcast request message to client in the present embodiment; Requesting client is through the packet of mode of unicast receiving target channel; And in unitcast request message, comprise first start sequence number through the packet of mode of unicast transmission, promptly notify the sequence number of the initial data bag of the client FCC unicast stream that server issues, packet can be real time transport protocol (Real-time Transport Protocol in the embodiment of the invention; Be called for short: RTP) bag.Can also comprise first blanking time (Δ t1) in the unitcast request message, this Δ t1 is used to indicate client from receiving packet through mode of unicast to the multiplexing multi-broadcast group institute elapsed time that withdraws from its adding at interval.

Alternatively, can also comprise the address information of the multiplexing multi-broadcast group that client adds in the unitcast request message that the FCC server issues in the present embodiment, supply client to withdraw from multiplexing multi-broadcast group according to address information.When client withdrawed from the moment of multiplexing multi-broadcast group in arrival, the address information that can be directly issue according to the FCC server was directly selected to withdraw from, and had avoided the troublesome operation that when client is in a plurality of multiplexing multi-broadcast group simultaneously, withdraws from.

The FCC server is sending in the process of FCC multi-case data to client in each enforcement of the present invention; Can be unicast data stream to client to be provided according to pre-conditioned judging whether; When condition satisfies; The FCC server is that client provides unicast data stream according to bandwidth situation available in the network, and concrete condition can also be: client still exists idle bandwidth and FCC server that vacant unicast resource etc. is arranged in network in same multiplexing multicast data flow and the client that reception FCC server provides after a period of time.

Step 101, after the affirmation response that receives the said unitcast request message that said client returns, the packet that sends sequence number and begin to said client through mode of unicast from said first start sequence number;

After client receives unitcast request message, then return the affirmation response to the FCC server as satisfying the condition that receives unicast data stream.The FCC server begin to send packet through mode of unicast to client, and the sequence number of the packet that is sent is since first start sequence number after receiving and should confirming response.In the present embodiment, can carry out the number of the packet that sends is counted, or the size of the packet that sends is counted at server end.

If also comprise Δ t1 information in the unitcast request message that the FCC server sends; Then the FCC server is sending packet process Δ t1 after the time through mode of unicast; Withdraw from request message to the client transmission; The multiplexing multi-broadcast group that adds before requesting client withdraws from; Stop to receive packet through multiplexing multi-broadcast group, if when also having other clients also to be in the channel handoff procedure simultaneously, the FCC server also will send packet to other client through multiplexing multi-broadcast group provide the service of channel service switchover certainly; If currently ought only have this client to carry out the channel service switchover, then the FCC server requests its just can stop to send packet after withdrawing from multiplexing multi-broadcast group.In the period of time hereafter, the FCC server only sends the unicast stream data to client.

Step 102 when the packet that sends to said client satisfies prerequisite, stops to send packet through mode of unicast to said client.In the present embodiment; Prerequisite comprises: the sequence number of the packet that sends to said client arrives second start sequence number; Or the number of the packet that sends to said client reaches certain numerical value; Or the size of the packet that sends to said client satisfies certain magnitude numerical value, and wherein, this magnitude numerical value can be provided with reference to the capacity numerical value that client receives the buffer of packet.Be the description aspect, the prerequisite that arrives second start sequence number with the sequence number of the packet that sends to said client is that example describes.When the sequence number of the packet that sends to said client arrives second start sequence number; Stop to send packet to said client the sequence number of the said second start sequence number original multi-broadcast group packet that receive, first said target channel that to be said client provide through media server through mode of unicast.

FCC server requests client withdraws from multiplexing multi-broadcast group and only sends in the process of packet to client through mode of unicast; Client will be changeed the adding original multi-broadcast group that media server provided and received native multicasting stream; After client received the packet of first target channel through original multi-broadcast group, meeting was that second start sequence number returns to the FCC server with the sequence number of this packet immediately.When the sequence number of the packet that sends through mode of unicast when the FCC server arrives second start sequence number, then stop the transmission of unicast packet, client is with the packet of continued through the target channel of original multi-broadcast group receiving media server transmission.

Data transmission method for uplink in the channel handoff procedure that present embodiment provides; When in the channel handoff procedure, sending packet through the multicast mode; Also carrying out unicast data to different user sends; And multi-case data and unicast data do not repeat, and the idle bandwidth that can make full use of different user is like this accomplished the channel switching fast; High rate user can make full use of idle bandwidth, is full of channel in advance and switches buffering area, accomplishes channel and switches, and promotes channel Switch Video quality; Do not influence simultaneously user's service to low rate; Embody user's differentiated service.

Fig. 2 is data receive method embodiment one flow chart in the channel handoff procedure of the present invention, and as shown in Figure 2, this flow process comprises the steps:

Step 200; In the process of the packet of the multiplexing multi-broadcast group receiving target channel that has sent channel switch request to channel switching server and provide through said channel switching server; Receive that said channel switching server sends, be used for requesting client receives the packet of said target channel through mode of unicast unitcast request message, said unitcast request message comprises first start sequence number of the packet that said channel switching server sends through mode of unicast;

When the user need carry out the channel suitching type, client was sent channel switch request to network side.After network side FCC server receives the channel switch request of client transmission,, select a multiplexing multi-broadcast group for client the packet of target channel is provided for this client according to the time that receives this channel switch request and the information such as sign of target channel.Subsequently, client receives the unitcast request message that the FCC server sends, and said unitcast request message is used for the packet of requesting client through mode of unicast receiving target channel.In unitcast request message, comprise first start sequence number, promptly notify the sequence number of the initial data bag of the client FCC unicast stream that server issues through the packet of mode of unicast transmission.

In the present embodiment alternatively; Can also comprise first blanking time (Δ t1) in the unitcast request message that the FCC server issues, this Δ t1 is used to indicate client from receiving packet through mode of unicast to the multiplexing multi-broadcast group institute elapsed time that withdraws from its adding at interval.Alternatively; Also comprise the address information that withdraws from the used multiplexing multi-broadcast group of multiplexing multi-broadcast group in the unitcast request message that issues as if the FCC server in the present embodiment; Then client is when the moment of multiplexing multi-broadcast group is withdrawed from arrival; The address information that can be directly issue according to the FCC server is directly selected to withdraw from, and has avoided the troublesome operation that when client is in a plurality of multiplexing multi-broadcast group simultaneously, withdraws from.

Step 201 after affirmation response from said unitcast request message to said channel switching server that return, receives the packet that sequence number that said channel switching server sends begins from said first start sequence number through mode of unicast;

After client receives unitcast request message, then return the affirmation response to the FCC server as satisfying the condition that receives unicast data stream.The FCC server begin to send packet through mode of unicast to client, and the sequence number of the packet that is sent is since first start sequence number after receiving and should confirming response.

If the FCC server also comprises Δ t1 in the unitcast request message of being sent, then send packet process Δ t1 after the time through mode of unicast at the FCC server, client withdraws from multiplexing multi-broadcast group and stops to receive packet through multiplexing multi-broadcast group.In the period of time hereafter, client only receives the unicast stream data through the FCC server.Certainly this section period can be " 0 ", and promptly client is just accomplished the original multi-broadcast group of adding this moment, and then client receives the multicast stream of the unicast stream and the media server of FCC server simultaneously.

Step 202; When the sequence number of the packet that receives arrives second start sequence number; Stop to receive packet and receiving the packet of said target channel through the original multi-broadcast group that media server provides through mode of unicast, said second start sequence number is that said client is through said original multi-broadcast group sequence number that receive, first said packet.

When client withdraws from multiplexing multi-broadcast group; Change and add the original multi-broadcast group reception native multicasting stream that media server provided; After client received the packet of first target channel through original multi-broadcast group, meeting was that second start sequence number returns to the FCC server with the sequence number of this packet immediately.When the sequence number of the packet that sends through mode of unicast when the FCC server arrives second start sequence number; Then stop the transmission of unicast packet; Client is accomplished channel and is switched with the packet of continued through the target channel of original multi-broadcast group receiving media server transmission.

Fig. 3 is channel handoff procedure embodiment one sketch map of the present invention; Send data receive method embodiment one in embodiment one and the channel handoff procedure based on data in the above-mentioned channel handoff procedure; It is as shown in Figure 3 to carry out channel handoff procedure sketch map when the data transmission rate of multiplexing multi-broadcast group is one times of speed, abscissa express time (time) wherein, and ordinate is represented the sequence number (SN) of packet; Packet is sent in line 1 expression through multiplexing multi-broadcast group schematic lines; The schematic lines that line 2 expressions are sent packet through mode of unicast, the schematic lines that line 3 expressions are sent packet through original multi-broadcast group can be known by figure; " 0 " added the selected multiplexing multi-broadcast group of FCC server constantly when client-requested was carried out the channel switching, and the FCC server sends packet through multiplexing multi-broadcast group; The FCC server sends unitcast request message and is receiving to client and confirms to send packet through mode of unicast to client constantly at t1 after the response afterwards, and the start sequence number of the packet that is sent is the packet that SN1 promptly sends sequence number and begins from SN1 through mode of unicast.As shown in the figure at t1 constantly to t2 in the Δ t1 time interval between constantly; The FCC server sends multi-case data and unicast data to client simultaneously; Wherein Δ t1 is the FCC server and sends to first blanking time that comprises in the unitcast request message of client; This Δ t1 not only is used to indicate client to withdraw from multiplexing multi-broadcast group after the time through Δ t1 constantly at t1; Also be used to indicate client when withdrawing from multiplexing multi-broadcast group, the original multi-broadcast group that provides through media server receives packet promptly in the multicast of synchronization completion adding media server.In said process; Client is SN2 in the sequence number of the packet that t2 constantly receives through original multi-broadcast group; Client returns to the FCC server with the serial number information of SN2, and the FCC server is worked as the packet that is sent when sending packet through clean culture sequence number arrives SN2, then stops the transmission of unicast data; After this client only receives the packet that original multi-broadcast group is sent, and accomplishes channel and switches.

In the above-described embodiments, the FCC server can periodically send the information of multiplexing multi-broadcast group to each client, and when client was carried out the channel switching, according to known multiplexing multi-broadcast group information, the multiplexing multi-broadcast group of selecting to be fit to added.It can also be to be triggered by following situation that the FCC server stops the clean culture transmission; For example comprise that the FCC server provides clean culture with the speed of the available bandwidth of client to client; Up to server is that the data flow that provides of client is overtime; Perhaps the data flow that provides of FCC server can satisfy the message requirement that data flow is sent that stops from client, and perhaps the FCC server data flow that stops that receives client is sent request; Perhaps the FCC server receives the new channel switch request of client; Perhaps resource in the FCC server or Internet resources are not enough, and the FCC server can not continue as client this unicast data service etc. is provided.In addition; In the above embodiments; The data transmission rate of multiplexing multi-broadcast group can be the data transmission rate R (identical with the slope of line 3 like Fig. 3 center line 1) of original multi-broadcast group; Can also can be speed, and the speed of this multicast data stream be variable also greater than the speed of native multicasting stream less than native multicasting stream; In the above embodiments, the FCC server sends packet through mode of unicast to client with client idle bandwidth speed (ER), and the transmission speed of unicast data stream is variable.

Data receive method in the channel handoff procedure that present embodiment provides; When client receives packet through the multicast mode in the channel handoff procedure; Also receive data through mode of unicast; And multi-case data and unicast data do not repeat, and the idle bandwidth that can make full use of different user is like this accomplished the channel switching fast; High rate user can make full use of idle bandwidth, is full of channel in advance and switches buffering area, accomplishes channel and switches, and promotes channel Switch Video quality; Do not influence simultaneously user's service to low rate; Embody user's differentiated service.

The embodiment of the invention also provides data transmission method for uplink and data receive method embodiment two in the channel handoff procedure; Based on data transmission method for uplink and data receive method embodiment one in the above-mentioned channel handoff procedure; Data transmission method for uplink and data receive method embodiment two provide in the another kind of FCC business flow process that is synchronized to original multicast FCC server side from the FCC multicast of one times of speed; Be with sending method and Data Receiving embodiment one difference; The FCC server sends in the process of packet among data transmission method for uplink and the data receive method embodiment one through mode of unicast; Data are sent can keep the idle bandwidth speed that unified speed is client all the time, and among data transmission method for uplink and the data receive method embodiment two, the FCC server sends in the process of packet through mode of unicast; Data transmission rate can change in different time sections, can shorten channel switching time like this.For the FCC server; The flow process that data transmission method for uplink embodiment one describes in data transmission method for uplink embodiment two and the above-mentioned channel handoff procedure in the channel handoff procedure is roughly the same; Wherein difference is: after the FCC server has sent unitcast request message; Unicast stream will be synchronous with native multicasting stream after the FCC server calculates second blanking time (Δ t2); Can send a request message to client, this request message comprises and is used to indicate client from stopping to receive packet to the Δ t2 information that begins to receive through original multi-broadcast group packet through multiplexing multi-broadcast group.And; Unitcast request message informing client among the data transmission method for uplink embodiment one is after the Δ t1 time; Not only to withdraw from multiplexing multi-broadcast group but also will add original multi-broadcast group simultaneously; But unitcast request message withdraws from multiplexing multi-broadcast group after only notifying client to accomplish in the Δ t1 time among the data transmission method for uplink embodiment two, when does not add original multi-broadcast group but do not relate to; And the notice of the request message through follow-up transmission client is adding original multi-broadcast group through Δ t2 after the time.For client; The flow process that data receive method embodiment one describes in data receive method embodiment two and the above-mentioned channel handoff procedure in the channel handoff procedure is roughly the same; Wherein difference is: client is also wanted the request message that comprises Δ t2 information of receiving channels switching server transmission after receiving unitcast request message; And client is after receiving unitcast request message, withdraws from multiplexing multi-broadcast group after accomplishing in the Δ t1 time, but do not insert original multi-broadcast group simultaneously; After this also will receive the request message that comprises Δ t2 information that the FCC server sends, client through after the Δ t2 time, adds original multi-broadcast group after withdrawing from multiplexing multi-broadcast group.In addition; In the channel handoff procedure among the data receive method embodiment two transmission of Δ t2 information another kind of implementation can also be arranged; Promptly for the FCC server; Δ t2 information needn't be sent through a request message separately, but can directly Δ t2 be included in the disposable client that sends in the unitcast request message.For client, the unnecessary priority of client receives two request messages, can receive Δ t1 and two information of Δ t2 but only receive a unitcast request message.

Fig. 4 is channel handoff procedure embodiment two sketch mapes of the present invention; Carrying out channel when the data transmission rate of multiplexing multi-broadcast group is one times of speed, to switch another process sketch map as shown in Figure 4, abscissa express time (time) wherein, and ordinate is represented the sequence number (SN) of packet; Packet is sent in line 1 expression through multiplexing multi-broadcast group schematic lines; The schematic lines that line 2 expressions are sent packet through mode of unicast, the schematic lines that line 3 expressions are sent packet through original multi-broadcast group can be known by figure; " 0 " added the selected multiplexing multi-broadcast group of FCC server constantly when client-requested was carried out the channel switching, and the FCC server sends packet through multiplexing multi-broadcast group; The FCC server sends unitcast request message and is receiving to client and confirms to send packet through mode of unicast to client constantly at t1 after the response afterwards, and the start sequence number of the packet that is sent is the packet that SN1 promptly sends sequence number and begins from SN1 through mode of unicast.Unicast stream caught up with native multicasting stream after the FCC server calculated the Δ t2 time, sent a request message to client (describing to be sent as example at twice in the present embodiment), required the client Δ t2 time to accomplish the original multi-broadcast group that adds media server later on.As shown in the figure at t1 constantly to t2 in the Δ t1 time interval between constantly; The FCC server sends multi-case data and unicast data to client simultaneously; Constantly to t3 in the Δ t2 time interval between constantly, the FCC server only sends data through mode of unicast to client at t2.Wherein Δ t1 is the FCC server and sends to first blanking time that comprises in the unitcast request message of client, and this Δ t1 is used to indicate client to withdraw from multiplexing multi-broadcast group after the time through Δ t1 constantly at t1.In said process; Client is SN2 in the sequence number of the packet that t3 constantly receives through original multi-broadcast group; Client returns to the FCC server with the serial number information of SN2, and the FCC server is worked as the packet that is sent when sending packet through clean culture sequence number arrives SN2, then stops the transmission of unicast data; After this client only receives the packet that original multi-broadcast group is sent, and accomplishes channel and switches.The FCC server sends sequence number to client through mode of unicast and can comprise referring to Fig. 4 since the process of the packet of first start sequence number in the present embodiment:

In the first blanking time Δ t1, the FCC server sends packet through mode of unicast to client with third speed ER, and client receives packet; Wherein ER representes client idle bandwidth speed.

In the second blanking time Δ t2, the FCC server sends packet through mode of unicast to client with the 4th speed ER+R that is higher than said third speed ER, and client receives packet; Wherein R representes the speed of original multi-broadcast group.

Arrive behind the Δ t2 to through mode of unicast in the time period when the sequence number of the packet that client is sent arrives second start sequence number, sending packet through mode of unicast to client with third speed ER or the 5th speed that is lower than third speed E ' R.

The speed that present embodiment and above-mentioned data transmission method for uplink and Data Receiving embodiment one send data except above-mentioned mode of unicast changes and client add opportunity of original multi-broadcast group different; Other flow process is all identical with embodiment one with the step description, repeats no more here.

The embodiment of the invention also provides data transmission method for uplink and data receive method embodiment three in the channel handoff procedure; Based on data transmission method for uplink and data receive method embodiment one in the above-mentioned channel handoff procedure; Data transmission method for uplink and data receive method embodiment three provide in a kind of FCC business the flow process that is synchronized to original multicast FCC server side from the FCC multicast greater than one times of speed; Be that with data transmission method for uplink and data receive method embodiment one difference at first the data transmission rate of multiplexing multi-broadcast group will be higher than the transmission rate of original multi-broadcast group data among data transmission method for uplink and the data receive method embodiment three; The FCC server sends in the process of packet among data transmission method for uplink and the data receive method embodiment one through mode of unicast in addition; Data are sent and can be kept the idle bandwidth speed that unified speed is client all the time; And among data transmission method for uplink and the data receive method embodiment three; The FCC server sends in the process of packet through mode of unicast, and data transmission rate can change in different time sections, can shorten channel switching time like this.For the FCC server; The flow process that data transmission method for uplink embodiment one describes in data transmission method for uplink embodiment three and the above-mentioned channel handoff procedure in the channel handoff procedure is roughly the same; Wherein difference is; After the FCC server is received the sequence number of first multicast packets of the original multi-broadcast group that client is sent, improve unicast rate and carry out packet and send.For client, in the flow process that data receive method embodiment one describes in above-mentioned channel handoff procedure, client successively experiences two kinds of different transmission rates when receiving packet through mode of unicast.

Fig. 5 is channel handoff procedure embodiment three sketch mapes of the present invention; It is as shown in Figure 5 that the data transmission rate of multiplexing multi-broadcast group is carried out channel handoff procedure sketch map for greater than one times of speed the time, abscissa express time (time) wherein, and ordinate is represented the sequence number (SN) of packet; Packet is sent in line 1 expression through multiplexing multi-broadcast group schematic lines; The schematic lines that line 2 expressions are sent packet through mode of unicast, the schematic lines that line 3 expressions are sent packet through original multi-broadcast group can be known by figure; " 0 " added the selected multiplexing multi-broadcast group of FCC server constantly when client-requested was carried out the channel switching, and the FCC server sends packet through multiplexing multi-broadcast group; The FCC server sends unitcast request message and is receiving to client and confirms to send packet through mode of unicast to client constantly at t1 after the response afterwards, and the start sequence number of the packet that is sent is the packet that SN1 promptly sends sequence number and begins from SN1 through mode of unicast.As shown in the figure at t1 constantly to t2 in the Δ t1 time interval between constantly; The FCC server sends multi-case data and unicast data to client simultaneously; Wherein Δ t1 is the FCC server and sends to first blanking time that comprises in the unitcast request message of client; This Δ t1 not only is used to indicate client to withdraw from multiplexing multi-broadcast group after the time through Δ t1 constantly at t1; Also be used to indicate client when withdrawing from multiplexing multi-broadcast group, the original multi-broadcast group that provides through media server receives packet promptly in the multicast of synchronization completion adding media server.In said process, client is SN2 in the sequence number of the packet that t2 constantly receives through original multi-broadcast group, and client returns to the FCC server with the serial number information of SN2, after the FCC server receives SN2 information, improves the transmission rate of unicast data.Afterwards, the FCC server is worked as the packet that is sent when sending packet through clean culture sequence number arrives SN2, then stops the transmission of unicast data, and after this client only receives the packet that original multi-broadcast group is sent, and accomplishes channel and switches.The FCC server sends sequence number to client through mode of unicast and can comprise referring to Fig. 5 since the process of the packet of first start sequence number in the present embodiment:

In the said first blanking time Δ t1, send packet through mode of unicast to client with first rate, client receives packet.

After arriving the first blanking time Δ t1, to through mode of unicast in the time period when the sequence number of the packet that client is sent arrives second start sequence number, send packet through mode of unicast to client with the first rate or second speed that is higher than first rate.Wherein first rate equals ER+R-FCC, and ER+R-FCC＜second speed≤ER, ER represent client idle bandwidth speed, and R representes the speed of original multi-broadcast group, and FCC representes the speed of multiplexing multi-broadcast group.

Present embodiment and above-mentioned data transmission method for uplink and Data Receiving embodiment one except the data transmission rate of multiplexing multi-broadcast group for greater than the speed of one times original multi-broadcast group or select variable bit rate for use; And outside the mode of unicast speed of sending data changes; Other flow process is all identical with embodiment one with the step description, repeats no more here.

Data Receiving and data transmission method for uplink in the channel handoff procedure that above-mentioned each embodiment provides; When in the channel handoff procedure, sending packet through the multicast mode; Also carrying out unicast data to different user sends; And multi-case data and unicast data do not repeat, and the idle bandwidth that can make full use of different user is like this accomplished the channel switching fast; High rate user can make full use of idle bandwidth, is full of channel in advance and switches buffering area, accomplishes channel and switches, and promotes channel Switch Video quality; Do not influence simultaneously user's service to low rate; Embody user's differentiated service; Embody user's differentiated service; But also can quick synchronous service preferentially be provided for important channel, and preferentially guarantee the channel quality of handoff of important channel, embody the differentiated service of different channel.

One of ordinary skill in the art will appreciate that: all or part of step that realizes said method embodiment can be accomplished through the relevant hardware of program command; Aforesaid program can be stored in the computer read/write memory medium; This program the step that comprises said method embodiment when carrying out; And aforesaid storage medium comprises: various media that can be program code stored such as ROM, RAM, magnetic disc or CD.

Fig. 6 is channel switching server embodiment one structural representation of the present invention; As shown in Figure 6; This FCC server comprises first processing module 11, second processing module 12 and the 3rd processing module 13; Wherein first processing module 11 is used for sending to client in the channel switch request of sending according to client, through the multiplexing multi-broadcast group of selecting for client the process of the packet of target channel; Be used to ask the unitcast request message of this client through the packet of this target channel of mode of unicast reception to this client transmission, this unitcast request message comprises first start sequence number of the packet that sends through mode of unicast; Second processing module 12 is used for after the affirmation response that receives this unitcast request message that this client returns, the packet that sends sequence number and begin from this first start sequence number to this client through mode of unicast; The 3rd processing module 13 is used for when the sequence number of the packet that sends to this client arrives second start sequence number; Stop to send packet to this client the sequence number of the original multi-broadcast group packet that receive, first target channel that this second start sequence number provides through media server for this client through mode of unicast.

In the above-described embodiments; If also comprised for first blanking time in the unitcast request message that first processing module 11 is sent; Be used to said first blanking time indicate client from receiving packet to the time period information that withdraws from multiplexing multi-broadcast group through mode of unicast; Then second processing module 12 just can be according to the request of first processing module 11; After beginning to arrive first blanking time through mode of unicast transmission packet, requesting client withdraws from multiplexing multi-broadcast group and stops to receive packet through multiplexing multi-broadcast group.

In another FCC server implementation example provided by the invention; On the basis of above-mentioned each embodiment; Comprise above-mentioned first processing module 11, second processing module 12 and the 3rd processing module 13 equally; Second processing module 12 that different is wherein also is used for since the process of the packet of first start sequence number carrying out sending sequence number to client through mode of unicast: in first blanking time, send packet through mode of unicast to client with first rate; Arrive after first blanking time to through mode of unicast in the time period when the sequence number of the packet that client is sent arrives second start sequence number, sending packet through mode of unicast to client with the first rate or second speed that is higher than first rate.The FCC server realizes that through second processing module 12 the unicast data rate of change sends.Wherein first rate is ER+R-FCC, ER+R-FCC＜said second speed≤ER, and wherein ER representes client idle bandwidth speed, and R representes the speed of original multi-broadcast group, and FCC representes the speed of multiplexing multi-broadcast group.

In another FCC server implementation example provided by the invention; On the basis of above-mentioned each embodiment; Comprise above-mentioned first processing module 11, second processing module 12 and the 3rd processing module 13 equally; Different is that first processing module 11 also is used for: after sending unitcast request message, send a request message to client, this request message comprises and is used to indicate client from stopping to receive packet to second blanking time that begins to receive through original multi-broadcast group packet through multiplexing multi-broadcast group; The FCC server also has another kind of mode of sending for second blanking time; Be about to be included in the unitcast request message for second blanking time and send to client through first processing module, promptly the FCC server adopt a request message carry first blanking time and first blanking time two information send mode.Correspondingly, second processing module 12 is used for since the process of the packet of first start sequence number carrying out sending sequence number to client through mode of unicast: in first blanking time, send packet through mode of unicast to client with third speed; In second blanking time, send packet through mode of unicast to said client with the 4th speed that is higher than third speed; Arrive after second blanking time to through mode of unicast in the time period when the sequence number of the packet that client is sent arrives second start sequence number, sending packet through mode of unicast to client with third speed or the 5th speed that is lower than third speed.Wherein third speed is ER, and said the 4th speed is ER+R, and wherein ER representes client idle bandwidth speed, and R representes the speed of original multi-broadcast group.

In each above-mentioned FCC server implementation example, first processing module 11 wherein also is used for sending in unitcast request message the address information of multiplexing multi-broadcast group, supplies client to withdraw from the multiplexing multi-broadcast group that client adds according to this address information.

More than when the FCC server that provides of each embodiment sends packet through the multicast mode in the channel handoff procedure; Also carrying out unicast data to different user sends; And multi-case data and unicast data do not repeat, and the idle bandwidth that can make full use of different user is like this accomplished the channel switching fast; High rate user can make full use of idle bandwidth, is full of channel in advance and switches buffering area, accomplishes channel and switches, and promotes channel Switch Video quality; Do not influence simultaneously user's service to low rate; Embody user's differentiated service; Embody user's differentiated service; But also can quick synchronous service preferentially be provided for important channel, and preferentially guarantee the channel quality of handoff of important channel, embody the differentiated service of different channel.

Fig. 7 is client implementation example one structural representation of the present invention; As shown in Figure 7; This client comprises that manages module 21, the 5th processing module 22 and the 6th processing module 23 everywhere; Wherein, The manages module 21 everywhere is used for the process at the packet of the multiplexing multi-broadcast group receiving target channel that has sent channel switch request to the FCC server and provide through the FCC server, receive that this FCC server sends, be used for the unitcast request message of requesting client through the packet of mode of unicast receiving target channel, this unitcast request message comprises first start sequence number of the packet that this FCC server sends through mode of unicast; The 5th processing module 22 is used for after affirmation response from unitcast request message to the FCC server that return, the packet that the sequence number of sending through mode of unicast reception FCC server begins from this first start sequence number; The 6th processing module 23 is used for when the sequence number of the packet that receives arrives second start sequence number; Stop to receive packet and receiving the packet of this target channel through the original multi-broadcast group that media server provides through mode of unicast, this second start sequence number is that client is through original multi-broadcast group sequence number that receive, first packet.

In the above-described embodiments; If the manages everywhere in the unitcast request message that module 21 receives and also comprised for first blanking time; Be used to said first blanking time indicate client from receiving packet to the time period information that withdraws from multiplexing multi-broadcast group through mode of unicast; Then the 5th processing module 22 can also stop to receive packet through multiplexing multi-broadcast group after receive packet through mode of unicast and began to arrive first blanking time.In another client implementation example provided by the invention; On the basis of above-mentioned each embodiment; Comprise that equally above-mentioned manages module 21, the 5th processing module 22 and the 6th processing module 23 everywhere; Different is that the 5th processing module 22 is used for the process of the packet that the sequence number that execution is sent through this FCC server of mode of unicast reception begins from this first start sequence number: in first blanking time, receive the packet that the FCC server sends with first rate through mode of unicast; In the time period that arrives after first blanking time when arriving second start sequence number, receive the FCC server with first rate or be higher than the packet that second speed of first rate is sent through mode of unicast to the sequence number that receives the packet that the FCC server sends through mode of unicast.Wherein first rate is ER+R-FCC, ER+R-FCC＜said second speed≤ER, and wherein ER representes client idle bandwidth speed, and R representes the speed of original multi-broadcast group, and FCC representes the speed of multiplexing multi-broadcast group.

In another client implementation example provided by the invention; On the basis of above-mentioned each embodiment; Comprise that equally above-mentioned manages module 21, the 5th processing module 22 and the 6th processing module 23 everywhere;, the mode of sending for second blanking time with the FCC server is corresponding, and different is manages module 21 everywhere and also is used for: after receiving unitcast request message; Receive the request message that the FCC server sends again, this request message comprises and is used to indicate client from stopping to receive packet to second blanking time that begins to receive through original multi-broadcast group packet through multiplexing multi-broadcast group; Perhaps the manage everywhere module 21 also be used to receive that the FCC server sends, also comprise the unitcast request message of second blanking time.Correspondingly; The 5th processing module 22 is used for since the process of the packet of first start sequence number in the sequence number of carrying out through the transmission of mode of unicast reception FCC server: in first blanking time, receive the packet that the FCC server sends with third speed through mode of unicast; In second blanking time, receive the packet that the FCC server sends with the 4th speed that is higher than third speed through mode of unicast; In the time period that arrives after second blanking time when arriving second start sequence number, send packet through mode of unicast to client with third speed or the 5th speed that is lower than third speed to the sequence number that receives the packet that the FCC server sends through mode of unicast.Wherein third speed is ER, and the 4th speed is ER+R, and wherein ER representes client idle bandwidth speed, and R representes the speed of original multi-broadcast group.

In each above-mentioned client implementation example, wherein the manage the address information that unitcast request message that module 21 receives also comprises multiplexing multi-broadcast group everywhere, the 5th processing module 22 also is used for withdrawing from multiplexing multi-broadcast group according to this address information.

More than when the client that provides of each embodiment receives packet through the multicast mode in the channel handoff procedure; Also receive data through mode of unicast; And multi-case data and unicast data do not repeat, and the idle bandwidth that can make full use of different user is like this accomplished the channel switching fast; High rate user can make full use of idle bandwidth, is full of channel in advance and switches buffering area, accomplishes channel and switches, and promotes channel Switch Video quality; Do not influence simultaneously user's service to low rate; Embody user's differentiated service; But also can quick synchronous service preferentially be provided for important channel, and preferentially guarantee the channel quality of handoff of important channel, embody the differentiated service of different channel.

Fig. 8 forms sketch map for network system embodiment of the present invention; As shown in Figure 8; This network system comprises FCC server 1 and client 2; The FCC server and client side that the FCC server and client side who wherein relates to can adopt above-mentioned each embodiment to provide respectively, its concrete structure and function repeat no more here.The network system that present embodiment provides can make full use of the idle bandwidth of different user and accomplish the channel switching fast, promotes channel Switch Video quality; But also can quick synchronous service preferentially be provided for important channel, and preferentially guarantee the channel quality of handoff of important channel, embody the differentiated service of different channel.

What should explain at last is: above embodiment is only in order to explaining technical scheme of the present invention, but not to its restriction; Although with reference to previous embodiment the present invention has been carried out detailed explanation, those of ordinary skill in the art is to be understood that: it still can be made amendment to the technical scheme that aforementioned each embodiment put down in writing, and perhaps part technical characterictic wherein is equal to replacement; And these are revised or replacement, do not make the spirit and the scope of the essence disengaging various embodiments of the present invention technical scheme of relevant art scheme.

Claims

1. data transmission method for uplink in the channel handoff procedure is characterized in that, comprising:

2. data transmission method for uplink in the channel handoff procedure according to claim 1 is characterized in that,

When the sequence number of the packet that sends to said client arrives second start sequence number; Stop to send packet to said client the sequence number of the said second start sequence number original multi-broadcast group packet that receive, first said target channel that to be said client provide through media server through mode of unicast.

3. data transmission method for uplink in the channel handoff procedure according to claim 1; It is characterized in that; Said unitcast request message also comprises and is used to indicate said client from receiving packet to first blanking time of withdrawing from said multiplexing multi-broadcast group through mode of unicast; Said after the affirmation response that receives the said unitcast request message that said client returns, also comprise after said client sends sequence number the step of the packet that begins from said first start sequence number through mode of unicast:

After beginning to arrive said first blanking time, ask said client to withdraw from said multiplexing multi-broadcast group and stop to receive packet through said multiplexing multi-broadcast group through mode of unicast transmission packet.

4. data transmission method for uplink in the channel handoff procedure according to claim 3 is characterized in that, saidly comprises to the said client packet that begins from said first start sequence number that sends sequence number through mode of unicast:

In said first blanking time, send packet through mode of unicast to said client with first rate;

Arrive after said first blanking time to through mode of unicast in the time period when the sequence number of the packet that said client is sent arrives second start sequence number; Send packet through mode of unicast to said client with the said first rate or second speed that is higher than said first rate; Wherein, Said first rate is ER+R-FCC, ER+R-FCC＜said second speed≤ER, and wherein ER representes said client idle bandwidth speed; R representes the speed of said original multi-broadcast group, and FCC representes the speed of said multiplexing multi-broadcast group.

5. data transmission method for uplink in the channel handoff procedure according to claim 3 is characterized in that, said method also comprises:

After sending said unitcast request message; Send a request message to said client, described request message comprises and is used to indicate said client from stopping to receive packet to second blanking time that begins to receive through said original multi-broadcast group packet through said multiplexing multi-broadcast group; Perhaps

Also comprise in the said unitcast request message of sending and be used to indicate said client from stopping to receive packet to second blanking time that begins to receive packet through said original multi-broadcast group through said multiplexing multi-broadcast group.

6. data transmission method for uplink in the channel handoff procedure according to claim 5 is characterized in that, saidly comprises to the said client packet that begins from said first start sequence number that sends sequence number through mode of unicast:

In said first blanking time, send packet through mode of unicast to said client with third speed;

In said second blanking time, send packet through mode of unicast to said client with the 4th speed that is higher than said third speed;

Arrive after said second blanking time to through mode of unicast in the time period when the sequence number of the packet that said client is sent arrives second start sequence number; Send packet through mode of unicast to said client with said third speed or the 5th speed that is lower than said third speed; Wherein, said third speed is ER, and said the 4th speed is ER+R; Wherein ER representes said client idle bandwidth speed, and R representes the speed of said original multi-broadcast group.

7. according to data transmission method for uplink in claim 3 or the 4 described channel handoff procedures; It is characterized in that; Also be used to indicate said first blanking time said client when withdrawing from said multiplexing multi-broadcast group, the original multi-broadcast group that provides through said media server receives packet.

8. according to data transmission method for uplink in claim 1 or the 3 described channel handoff procedures, it is characterized in that, saidly send packet through mode of unicast to said client and comprise:

With said client idle bandwidth speed or variable bit rate, send packet to said client through mode of unicast.

9. according to data transmission method for uplink in claim 1 or 3 or the 4 or 5 described channel handoff procedures, it is characterized in that said multiplexing multi-broadcast group comprises the multiplexing multi-broadcast group set up or according to said channel switch request and newly-built multiplexing multi-broadcast group.

10. according to data transmission method for uplink in claim 1 or 3 or the 4 or 5 described channel handoff procedures; It is characterized in that; The address information that also comprises said multiplexing multi-broadcast group in the said unitcast request message supplies said client to withdraw from said multiplexing multi-broadcast group according to said address information.

11. data receive method in the channel handoff procedure is characterized in that, comprising:

12. data receive method in the channel handoff procedure according to claim 11 is characterized in that,

When the sequence number of the packet that receives arrives second start sequence number; Stop to receive packet and receiving the packet of said target channel through the original multi-broadcast group that media server provides through mode of unicast, said second start sequence number is that said client is through said original multicast sequence number that carefully receive, first said packet.

13. data receive method in the channel handoff procedure according to claim 11; It is characterized in that; Said unitcast request message also comprises and is used to indicate said client from receiving packet to first blanking time of withdrawing from said multiplexing multi-broadcast group through mode of unicast, saidly comprises after crossing the step that mode of unicast receives the packet that sequence number that said channel switching server sends begins from said first start sequence number:

After beginning to arrive said first blanking time, stop to receive packet through said multiplexing multi-broadcast group through mode of unicast reception packet.

14. data receive method in the channel handoff procedure according to claim 13 is characterized in that, saidly receives the sequence number that said channel switching server sends through mode of unicast and comprises from the packet that said first start sequence number begins:

In said first blanking time, receive the packet that said channel switching server sends with first rate through mode of unicast;

In the time period that arrives after said first blanking time when arriving second start sequence number to the sequence number that receives the packet that said channel switching server sends through mode of unicast; Receive said channel switching server with said first rate or be higher than the packet that second speed of said first rate is sent through mode of unicast; Wherein, Said first rate is ER+R-FCC, ER+R-FCC＜said second speed≤ER, and wherein ER representes said client idle bandwidth speed; R representes the speed of said original multi-broadcast group, and FCC representes the speed of said multiplexing multi-broadcast group.

15. data receive method in the channel handoff procedure according to claim 13 is characterized in that, said method also comprises:

After receiving said unitcast request message; Receive the request message that said channel switching server sends again, described request message comprises and is used to indicate said client from stopping to receive packet to second blanking time that begins to receive through said original multi-broadcast group packet through said multiplexing multi-broadcast group; Perhaps

Also comprise in the said unitcast request message that receives and be used to indicate said client from stopping to receive packet to second blanking time that begins to receive packet through said original multi-broadcast group through said multiplexing multi-broadcast group.

16. data receive method in the channel handoff procedure according to claim 15 is characterized in that, saidly receives the sequence number that said channel switching server sends through mode of unicast and comprises from the packet that said first start sequence number begins:

In said first blanking time, receive the packet that said channel switching server sends with third speed through mode of unicast;

In said second blanking time, receive the packet that said channel switching server sends with the 4th speed that is higher than said third speed through mode of unicast;

In the time period that arrives after said second blanking time when arriving second start sequence number to the sequence number that receives the packet that said channel switching server sends through mode of unicast; Send packet through mode of unicast to said client with said third speed or the 5th speed that is lower than said third speed; Wherein, said third speed is ER, and said the 4th speed is ER+R; Wherein ER representes said client idle bandwidth speed, and R representes the speed of said original multi-broadcast group.

17. according to data receive method in claim 13 or the 14 described channel handoff procedures; It is characterized in that; Also be used to indicate said first blanking time said client when withdrawing from said multiplexing multi-broadcast group, the original multi-broadcast group that provides through said media server receives packet.

18. according to data receive method in claim 11 or the 13 described channel handoff procedures, it is characterized in that, saidly receive packet through mode of unicast and comprise:

Receive the packet that said channel switching server sends with said client idle bandwidth speed or variable bit rate through mode of unicast.

19. according to data receive method in claim 11 or 13 or the 14 or 15 described channel handoff procedures; It is characterized in that said multiplexing multi-broadcast group comprises that the multiplexing multi-broadcast group set up or said channel switching server are according to said channel switch request and newly-built multiplexing multi-broadcast group.

20. according to data receive method in claim 11 or 13 or the 14 or 15 described channel handoff procedures, it is characterized in that, also comprise the address information that withdraws from the used said multiplexing multi-broadcast group of said multiplexing multi-broadcast group in the said unitcast request message.

21. a channel switching server is characterized in that, comprising:

22. channel switching server according to claim 21 is characterized in that, also comprises:

The 3rd processing module; Be used for when the sequence number of the packet that sends to said client arrives second start sequence number; Stop to send packet to said client the sequence number of the said second start sequence number original multi-broadcast group packet that receive, first said target channel that to be said client provide through media server through mode of unicast.

23. channel switching server according to claim 21; It is characterized in that; If also comprising, the said unitcast request message that said first processing module is sent is used to indicate said client from receiving packet to first blanking time of withdrawing from said multiplexing multi-broadcast group through mode of unicast; Then said second processing module also is used for asking said client to withdraw from said multiplexing multi-broadcast group and stopping to receive packet through said multiplexing multi-broadcast group after send packet through mode of unicast and begin to arrive said first blanking time.

24. channel switching server according to claim 23 is characterized in that, said second processing module saidly is used for to said client sends sequence number the process of the packet that begins from said first start sequence number through mode of unicast carrying out:

Arrive after said first blanking time to through mode of unicast in the time period when the sequence number of the packet that said client is sent arrives second start sequence number, sending packet through mode of unicast to said client with the said first rate or second speed that is higher than said first rate.

25., it is characterized in that said first processing module also is used for according to claim 21 or 23 described channel switching servers:

In the said unitcast request message of sending, comprise and be used to indicate said client from stopping to receive packet to second blanking time that begins to receive packet through said original multi-broadcast group through said multiplexing multi-broadcast group.

26. channel switching server according to claim 25 is characterized in that, said second processing module saidly is being used for to said client sends sequence number the process of the packet that begins from said first start sequence number through mode of unicast carrying out:

Arrive after said second blanking time to through mode of unicast in the time period when the sequence number of the packet that said client is sent arrives second start sequence number, sending packet through mode of unicast to said client with said third speed or the 5th speed that is lower than said third speed.

27. a client is characterized in that, comprising:

28. client according to claim 27 is characterized in that, also comprises:

The 6th processing module; Be used for when the sequence number of the packet that receives arrives second start sequence number; Stop to receive packet and receiving the packet of said target channel through the original multi-broadcast group that media server provides through mode of unicast, said second start sequence number is that said client is through said original multi-broadcast group sequence number that receive, first said packet.

29. client according to claim 27; It is characterized in that; Also comprise and be used to indicate said client if said the manages said unitcast request message that module receives everywhere from receiving packet to first blanking time of withdrawing from said multiplexing multi-broadcast group through mode of unicast; Then said the 5th processing module also is used for stopping to receive packet through said multiplexing multi-broadcast group after receive packet through mode of unicast and begin to arrive said first blanking time.

30. client according to claim 27 is characterized in that, said the 5th processing module is used for the process of the packet that the said sequence number that receives said channel switching server transmission through mode of unicast of execution begins from said first start sequence number:

In the time period that arrives after said first blanking time when arriving second start sequence number, receive said channel switching server with said first rate or be higher than the packet that second speed of said first rate is sent through mode of unicast to the sequence number that receives the packet that said channel switching server sends through mode of unicast.

31., it is characterized in that said manages module everywhere also is used for according to claim 27 or 29 described clients:

Receive that said channel switching server sends, also comprise and be used to indicate said client from stopping to receive packet to the said unitcast request message that begins to receive second blanking time of packet through said original multi-broadcast group through said multiplexing multi-broadcast group.

32. client according to claim 31 is characterized in that, said the 5th processing module is used for during carrying out the process that receives the packet that sequence number that said channel switching server sends begins from said first start sequence number through mode of unicast:

In the time period that arrives after said second blanking time when arriving second start sequence number, send packet through mode of unicast to said client with said third speed or the 5th speed that is lower than said third speed to the sequence number that receives the packet that said channel switching server sends through mode of unicast.