CN101399684B - Layered transmission method and system for multimedia broadcast/multicast service - Google Patents
Layered transmission method and system for multimedia broadcast/multicast service Download PDFInfo
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Abstract
The invention provides a method for hierarchically transmitting multimedia broadcasting/multicasting service. The method comprises the following steps: a start request of the multimedia broadcasting/multicasting service initialized by network side is received; service information of sub-streams in different layers is obtained and resources for data of the sub-streams in different layers is distributed according to the start request, when the service is transmitted in a hierarchical transmission mode, and response message for the network side is returned; the sub-stream data transmitted by the network side is received after the network side receives the response message, and the sub-stream data is transmitted out after synchronous treatment. The invention also provides a system for hierarchically transmitting the multimedia broadcasting/multicasting service. By adopting the method and the system, the existing message signaling process is not changed by adding sub-stream identifications of a plurality of sub-streams indicating the same service; an access network is convenient to distribute and coordinate the resources a plurality of sub-streams, synchronization of data transmitting of each sub-stream is ensured, and the terminal is ensured to obtain the gain brought by hierarchical coding.
Description
Technical field
The present invention relates to the mobile communication technology field, relate in particular to a kind of multimedia broadcast/group broadcast service layered transmission method and system.
Background technology
In order effectively to utilize mobile network resource, third generation partnership project (Third GenerationPartnership Projects, 3GPP) multimedia broadcast/group broadcast service (MultimediaBroadcast/Multicast Service has been proposed, MBMS), promptly in the mobile network, provide a data source to send the point-to-multipoint service of data to a plurality of users, the realization Internet resources are shared, and improve utilization rate of network resource, especially air interface resource.
And at present in the multimedia broadcast/group broadcast service transmission, by multimedia broadcast/group broadcast service data being resolved into the data flow of different brackets, and the data flow of different brackets is modulated to respectively on the different arrowbands frequency band of wideband multimedia broadcast/group broadcast system and transmits simultaneously, that is to say that base layer data with a multimedia broadcast/group broadcast service is mapped on the narrow band frequency in the broadcast/group broadcast system, and enhancement data that should business is mapped on the another one narrow band frequency in the broadcast/group broadcast system; Can receive the data of a plurality of layers of this broadcasting/packet services simultaneously for the terminal use that the broadband reception ability is arranged (UE), and carry out compound, to obtain the higher quality of reception; UE for the narrow-band reception ability can select to receive only base layer data, equally also can watch this broadcasting service, and just quality can be weaker; Under this mode, needing Access Network is to belong to the resource that a plurality of sub-flow distribution of a business is coordinated together, and there is strict synchronous requirement in the transmission time of different layers data, could guarantee to be merged into a business after terminal receives a plurality of son streams.
Business is transferred to the user by Access Network after application layer realizes hierarchical coding, can regard the data of different layers as different business for Access Network, but need coordinate to belong to synchronous transmission the data of different layers; But at present at the multimedia broadcast/group broadcast service Delamination Transmission, core net also can't notify Access Network to divide the information of layer service layering, Access Network just can not guarantee the resource coordinated for a plurality of sub-flow distribution that belongs to a business together like this, and it is synchronous to control the transmitting time of eating dishes without rice or wine of each sub-flow data; Each concrete height stream of Access Network eats dishes without rice or wine to send synchronization aspects does not simultaneously have concrete suitable regulation yet.
Summary of the invention
In view of this, the problem that the present invention solves provides a kind of multimedia broadcast/group broadcast service layered transmission method and system, be convenient to carry out Synchronous Processing to the resource of a plurality of sub-flow distribution coordinations and to each sub-flow data, it is synchronous to have guaranteed that each sub-flow data sends, and has guaranteed that terminal obtains the gain that hierarchical coding brings.
For addressing the above problem, the technical scheme that the present invention proposes is as follows:
A kind of multimedia broadcast/group broadcast service layered transmission method, this method comprises:
The multimedia broadcast/group broadcast service that receives the network side initiation begins request;
Business information according to the different straton streams of described beginning acquisition request is different straton flow data Resources allocation also, returns response message to described network side then;
Receive described network side and receive the sub-flow data of sending behind the response message, and described sub-flow data is carried out sending after the Synchronous Processing.
Accordingly, the multimedia broadcast/group broadcast service of described network side initiation begins to ask further to comprise:
Core net resolves into a plurality of son streams with same business by hierarchical coding, sends session then and begins request message.
Accordingly, described session begins in the request message to increase and comprises and show that described sub-stream belongs to the sub-traffic identifier of same business.
Accordingly, described sub-traffic identifier further comprises:
The Temporary Mobile Group Identity TMGI that belongs to other son streams of same business.
Accordingly, described sub-traffic identifier can only appear in the sub-flow message at base layer data place.
Accordingly, described session begins to comprise among the TMGI in the request message and shows that sub-stream belongs to the sub-traffic identifier of same business.
Accordingly, described sub-traffic identifier does not increase the TMGI byte length.
Accordingly, the sub-traffic identifier difference of different layers substream of data.
Accordingly, described resource allocation further comprises:
When adopting the frequency domain layered model to carry out the business transmission, be different straton flow distribution different carriers, identical time slot and code channel resource;
When adopting the time domain layered model to carry out the business transmission, be different straton flow distribution same carrier waves, different time-gap and code channel resource.
Accordingly, described Synchronous Processing further comprises:
According to the data transmission parameters of each height stream, dispose the packet of each Transmission Time Interval correspondence, and begin to be transmitted as with data and initial each packet is numbered;
When adopting the frequency domain layering to carry out the business transmission, the packet of the identical numbering that each son stream of transmission is corresponding in different carrier, identical time slot and code channel;
When adopting the time domain layering to carry out the business transmission, the packet of the identical numbering that each son stream of transmission is corresponding in same carrier wave, different time-gap and code channel.
A kind of multimedia broadcast/group broadcast service Delamination Transmission system, this system comprises: core network element and Access Network unit, wherein:
Described core network element is used for initiating multimedia broadcast/group broadcast service to the Access Network unit and begins request, and receives the response message that the Access Network unit returns, and then sends sub-flow data to the Access Network unit;
Described Access Network unit is used for return response message then, and the sub-flow data that will receive carrying out sending after the Synchronous Processing according to the business information of the different straton streams of described beginning acquisition request and for different straton flow data Resources allocation.
Accordingly, described core network element further comprises: broadcast/multicast service center BM-SC, Gateway GPRS Support Node GGSN and Serving GPRS Support Node SGSN, wherein:
BM-SC is used for same business is resolved into a plurality of son streams by hierarchical coding, then by GGSN, SGSN after the Access Network unit sends multimedia broadcast/group broadcast service and begins request message and receive the response message that returns the Access Network unit, send sub-flow data to the Access Network unit;
The business that GGSN receives described BM-SC transmission begins to return response message behind the request message, then described professional beginning request message is sent to SGSN;
The business that SGSN receives described GGSN transmission begins to return response message behind the request message, then described professional beginning request message is sent to the Access Network unit.
Accordingly, described session begins in the request message to increase and comprises and show that described sub-stream belongs to the sub-traffic identifier of same business.
Accordingly, described session begins to comprise among the TMGI in the request message and shows that sub-stream belongs to the sub-traffic identifier of same business.
Accordingly, described Access Network unit further comprises: radio network controller (RNC);
Described RNC is used for receiving after described business begins request, when adopting the frequency domain layered model to carry out business when transmitting, is different straton flow distribution different carriers, identical time slot and code channel resource; When adopting the time domain layered model to carry out the business transmission, be different straton flow distribution same carrier waves, different time-gap and code channel resource;
And after receiving the sub-flow data that core network element sends over,, dispose the packet of each Transmission Time Interval correspondence, and begin to be transmitted as with data and initial each packet is numbered according to the data transmission parameters of each height stream; When adopting the frequency domain layering to carry out the business transmission, the packet of the identical numbering that each son stream of transmission is corresponding in different carrier, identical time slot and code channel; When adopting the time domain layering to carry out the business transmission, the packet of the identical numbering that each son stream of transmission is corresponding in same carrier wave, different time-gap and code channel.
Compared with prior art, the present invention has the following advantages: the sub-traffic identifier that shows a plurality of son streams of same business by increase, existing message signaling process is not made a change, and be convenient to the resource that Access Network is coordinated a plurality of sub-flow distribution according to transmission policy and sub-traffic identifier, and each sub-flow data carried out Synchronous Processing, it is synchronous to have guaranteed that each sub-flow data sends, and has guaranteed that terminal obtains gain and the benefit that hierarchical coding brings.
Description of drawings
Fig. 1 is the schematic flow sheet of the inventive method;
Fig. 2 is a time-division mapping scheme schematic diagram in the embodiment of the invention;
Fig. 3 is a frequency division mapping scheme schematic diagram in the embodiment of the invention;
Fig. 4 is the schematic block diagram of system of the present invention;
Fig. 5 is the schematic diagram of the embodiment of the invention 3 systems.
Embodiment
Basic thought of the present invention is after the business realizing hierarchical coding is decomposed into different son streams, with contain show sub-stream under belonging to the business of professional sub-traffic identifier begin the request mode and notify Access Network, make Access Network to begin to ask business (son stream) to distribute the resource of coordinating, and guarantee the time synchronized requirement of different straton flow datas when professional (sub-flow data) transmission according to this business that comprises described sub-traffic identifier into different layers.
Therefore, the invention provides a kind of multimedia broadcast/group broadcast service layered transmission method, as shown in Figure 1, this method comprises:
Step 101: the multimedia broadcast/group broadcast service that receives the network side initiation begins request;
Step 102: the business information according to the different straton streams of described beginning acquisition request is different straton flow data Resources allocation also, returns response message to described network side then;
Step 103: receive described network side and receive the sub-flow data of sending behind the response message, and described sub-flow data is carried out sending after the Synchronous Processing.
In order to make those skilled in the art person understand the present invention program better, the present invention is described in further detail below in conjunction with the drawings and specific embodiments, in the embodiment of the invention 1:
Network side is example with the core net: core net at first resolves into a plurality of son streams with same business by hierarchical coding, sends professional beginning request message MBMS SESSION START then, wherein:
Hierarchical coding in the present embodiment is that multimedia broadcast/group broadcast service is decomposed into basic layer level data and enhancement layer level data; Receive only the MBMS data division of basic layer even the principle of decomposing is a terminal, just can obtain original MBMS business by the demodulation sign indicating number, only lower grade of Ye Wu service quality (QoS); And receive basic layer and increase the two-part data of layer, just can obtain higher level QoS business;
For example: require E-UTRA (access of evolved universal terrestrial wireless) MBMS will support the mobile TV program of 16 channels at least in 3GPP TR 25.913, each channel is approximately 300kbps; 300kbps is equivalent to per second will pass image about 30 frames; A kind of simple decomposing scheme is exactly the part that the mobile TV program of a 300kbps is decomposed into two 15 frame/seconds, can certainly be to decompose in the application layer part (program source code section) of mobile TV program;
Simultaneously, core net can to described basic layer level data and the enhancement layer level data adopts the serial multiple connection in time domain or adopt parallel multiple connection mode to be mapped in the transmission resource block in frequency domain, therefore, terminal needs form notice receiving terminal for the data of these two grades shared resource block location etc. in transmission course, so that can accurately receive corresponding data according to self-ability by professional beginning request message; And this information comprises at least: the position of the transmission resource block that basic layer and enhancement layer are shared and zero-time and/or the mapping mode and/or the precoding mode of transmission, and/or every layer of coding that is adopted and modulation system etc.; And in the embodiment of the invention 1, begin to have increased in the request message the traffic identifier that shows the affiliated business of son stream in this business, concrete message format is as follows:
-TMGI; Temporary Mobile Group Identity
-Sub-stream identity{optional, e.g.TMGI1, TMGI2}; Sub-traffic identifier
-MBMS Bearer Service Type; MBMS carries COS
-MBMS Session Identity, if available; MBMS session identification (if available)
-Iu Signalling Connection Identifier IE; Iu signaling connection identifier
-RAB parameters (including e.g.Allocation/Retention Priority); RAB parameter (comprise distribution, keep priority)
-PDP Type Information, if available; PDP type information (if available)
-MBMS Session Duration; MBMS session persistence
-MBMS Service Area; The MBMS service-domain
-Frequency Layer Convergence Flag, if available; Frequency layer convergence mark (if available)
-RA List of Idle Mode UEs, ifavailable; The Tracking Area List (if available) of Idle pattern UE
-Global CN-ID IE, only when the MBMS SES SION START message issent from a CN node towards an RNC for which the sending CN node is not thedefault CN node; Whole world core net sign
-MBMS Session Repetition Number, if available; MBMS session number of repetition (if available)
-Time to MBMS Data Transfer; The MBMS data transmission period
As above shown in the form, in MBMS SESSION START message, increase sub-traffic identifier Sub-stream identity, TMGI comprising other son streams that belong to a business together, can arrange this Sub-stream identity only occurs in the configuration of base layer data place son stream, if Access Network is received this message and is found wherein to comprise Sub-stream identity, just know that this is the basic straton stream of certain business, and, know the TMGI of other son streams that belong to this business together according to the one or more TMGI signs that wherein comprise.
Because the transmission of a plurality of sub-flow datas of same business is initiated simultaneously, therefore Access Network can be received the MBMS SESSION START message at each son stream at the same time, can and guarantee that the transmission of data is synchronous at this a little stream unified distribution resource like this;
In addition, in the professional in the prior art beginning request message, shown in the table 1 composed as follows of TMGI:
Table 1
Wherein, Octet 2 is that a TMGI content-length is represented a Length of Temporary MobileGroup Identity contents, TMGI is a regular length at present, therefore this is actually not effect, can utilize this byte to come the sub-traffic identifier of transport service, can also continue to transmit simultaneously Length ofTemporary Mobile Group Identity contents;
Thereby in the embodiment of the invention 2, can also not begin to increase sub-traffic identifier in the request message in business, but in TMGI, do not increase under the situation of its byte length, increase sub-traffic identifier, specifically as shown in table 2:
Table 2
Wherein, amended TMGI structure is in the second byte part, and 1～3 bit representation stream is numbered the length of 4～8 bit representation Temporary Mobile Group Identity contents; 3 bits can identify 8 son streams, and next professional Delamination Transmission of ordinary circumstance can not surpass 8 son streams; The length of using 5 bit identification TMGI contents simultaneously also is enough; Thereby new TMGI form has increased sub-stream information, and with originally compared the length that does not increase TMGI; So, core net is when branch layer service of transmission, meeting will be included in the signaling simultaneously by a plurality of son streams that the signaling downstream node belongs to same business, each node is found out this a little stream independently professional, banising the TMGI that puts according to each height judges, determine which sub-stream is to belong to same business, and according to son stream ID obtain which sub-stream be base layer data, which a little stream be enhancement data; For example: certain business resolves into 3 sublayers, so among the TMGI of these 3 sublayer correspondences, Temporary Mobile Group Identity IEI, Length of TemporaryMobile Group Identity contents, MBMS Service ID, MCC, MNC are identical, that different is Sub-stream ID, and it be that 0, two Sub-stream ID that strengthens straton stream joins respectively is 1 and 2 that the Sub-stream ID of basic straton flow data joins;
After downstream node and Access Network receive that the session of core net transmission begins message, judge a plurality of professional corresponding TMGI that comprises in this message, if finding that wherein some professional MBMS Service ID is identical just knows that these several business are a plurality of sub-flow datas of certain actual MBMS business, further distinguish basic layer then and enhancement data is carried out subsequent operation according to Sub-stream ID.
In the embodiment of the invention 1 and 2, after Access Network is knowing that core net has been initiated a broadcasting/packet service request, when the terminal receiving ability is low, receive only and the basic layer of demodulation level data according to indication information; When the terminal receiving ability is strong, receive simultaneously and demodulation basic layer level data and enhancement layer level data according to indication information; Then the basic layer level data behind the coding and enhancement layer level data are carried out and go here and there conversion; Coded data after the conversion is mapped on each transmitting antenna of base station in serial on the time domain and sends; When basic layer level data transmitted, make terminal in running order; When the enhancement layer level data is transmitted, make the radio frequency part of terminal and receive link portions to change resting state over to; Concrete mapping scheme as shown in Figure 2; In addition, the data of basic layer and enhancement layer also can adopt the mode of frequency division multiplexing under multicarrier system, as shown in Figure 3.
Then, Access Network distributes the resource of coordinating mutually: if system configuration is a frequency domain Delamination Transmission strategy, then be different straton flow distribution different carriers, identical time slot and code channel resource according to the Delamination Transmission strategy that core net adopted for different straton flow datas; If system configuration is a time domain Delamination Transmission strategy, then be different straton flow distribution same carrier waves, different time-gap and code channel resource; So just guaranteed to belong to together the resource that a plurality of sub-flow distribution of a business is coordinated mutually, because the transmission of base layer data is to guarantee, when system resource was not enough, Access Network can also the preferential resource that guarantees base layer data; After being different straton flow distribution resources, described Access Network returns response message again and gives core net.
Described core net sends sub-flow data to Access Network after receiving the response message that Access Network returns.
At this moment, after Access Network receives described sub-flow data again,, dispose the corresponding packet of each Transmission Time Interval (TTI), and begin to be transmitted as initial from data, be numbered earlier according to the data transmission parameters of each height stream; Numbering can have certain-length, recycle, as adopting 4bit sign etc.; When if frequency domain Delamination Transmission strategy is adopted in professional transmission, in coordinating resource units (different carrier, identical time slot and code channel), transmit the packet of the corresponding identical numbering of each son stream; If time domain Delamination Transmission strategy is adopted in professional transmission, in coordinating resource units (same carrier wave, different time-gap and code channel), transmit the packet of the corresponding identical numbering of each son stream;
Concrete, in data transmission procedure, it is the suitable air interface data packets for transmission form of unit that the IP bag of each height stream that Access Network can transmit core net is encapsulated as with TTI according to transmission parameter, and from starting point, be numbered, as from 0 open numbering; The identical processing of The data to each height stream; When data send,, when arriving, in coordinating resource units (different carrier, identical time slot and code channel), transmit the packet of the corresponding identical numbering of each son stream then in each chronomere if adopt frequency domain Delamination Transmission strategy; If adopt time domain Delamination Transmission strategy, when arriving, in coordinating resource units (same carrier wave, different time-gap and code channel), transmit the packet of the corresponding identical numbering of each son stream in each chronomere.
One of ordinary skill in the art will appreciate that all or part of step that realizes in the foregoing description method is to instruct relevant hardware to finish by program, described program can be stored in the embodied on computer readable access media, does not repeat them here.
As can be seen, adopt method of the present invention, the sub-traffic identifier that shows a plurality of son streams of same business by increase, existing message signaling process is not made a change, and be convenient to the resource that Access Network is coordinated a plurality of sub-flow distribution according to transmission policy and sub-traffic identifier, and each sub-flow data carried out Synchronous Processing, guaranteed that each sub-flow data sends synchronously, guaranteed that terminal obtains gain and the benefit that hierarchical coding brings.
Based on above-mentioned thought, the present invention also provides a kind of multimedia broadcast/group broadcast service Delamination Transmission system, and as shown in Figure 4, this system comprises: core network element 401 and Access Network unit 402;
Described core network element 401 is used for initiating multimedia broadcast/group broadcast service to Access Network unit 402 and begins request, and receives the response message that Access Network unit 402 returns, and then sends sub-flow data to Access Network unit 402;
Described Access Network unit 402 is used for return response message then, and the sub-flow data that will receive carrying out sending after the Synchronous Processing according to the business information of the different straton streams of described beginning acquisition request and for different straton flow data Resources allocation.
Concrete, describe system of the present invention in detail by the embodiment of the invention 3, as shown in Figure 5:
In present embodiment 3, described core network element 401 further comprises: broadcast/multicast service center BM-SC, Gateway GPRS Support Node GGSN and Serving GPRS Support Node SGSN, wherein:
Business is sent to BM-SC by content provider/multicast and broadcast source, the hierarchical coding process can be carried out among the BM-SC, at present hierarchy encoding method is quite ripe, can utilize special code device that the substream of data of different layers is encoded, is divided into to business, does not repeat them here; After the business realizing hierarchical coding resolves into different son streams, when being ready for sending data, BM-SC initiates the MBMS session and begins flow process, the network carrying resource that is used for transmitting the MBMS data that requesting activation was necessary, and notice is about to begin to this interested terminal data transmission; By this flow process, the MBMS session attribute, as QoS, the MBMS service area is estimated the session duration, the MBMS data transmit the time started (time to MBMS datatransfer), can offer all GGSN that has registered corresponding MBMS bearer service and SGSN;
After the transmission session began request message, before beginning to send the MBMS data, BM-SC postponed a configurable time span (the MBMS data transmit the time started); This delay can be carried out buffer memory to avoid the entity except that BM-SC to the MBMS data by long enough, promptly postpone allow before BM-SC sends the MBMS data, network can execute all MBMS data and send needed flow process: for example, notice terminal and radio bearer are set up and should be finished before the MBMS data arrive wireless access network; Wherein, delay may be in the scope of seconds or tens of seconds, and BM-SC can dispose different time-delays respectively to the MBMS bearer service of 2G and 3G;
Concrete, BM-SC is used for same business is resolved into a plurality of son streams by hierarchical coding, then by GGSN, SGSN after the Access Network unit sends multimedia broadcast/group broadcast service and begins request message and receive the response message that returns the Access Network unit, send sub-flow data to the Access Network unit;
BM-SC sends session and begins request message (Session Start Request), indicate transfer of data on the horizon, and provide session attribute (TMGI, QoS, the MBMS service area, session identification, the session duration of estimating, the broadcast/group broadcast pattern, Counting indicates) and the 2G/3G indication, this message is sent by BM-SC agency and transfer function (Proxy and Transport Function) module, sends to all GGSN in " the list of downstream nodes " parameter in the MBMS bearer context; Status attribute in BM-SC agency and the transport function MBMS bearer context is set to " Active ";
The business that GGSN receives described BM-SC transmission begins to return response message behind the request message, then described professional beginning request message is sent to SGSN;
GGSN sends session and begins request message, and session attribute (TMGI, QoS, MBMS service area, session identification, the session duration of estimation, broadcast/group broadcast pattern, Counting indication) and 2G/3G indication are provided; This message sends to all SGSN in " 1ist of downstreamnodes " parameter in the MBMS bearer context among the GGSN, wherein, is provided for activating TEID and the IP address of the GGSN of load plane resource in the message; For the broadcasting MBMS bearer service, also be provided for activating TEID and the IP address of the GGSN of signaling plane resource in the message; Wherein, for the broadcasting MBMS bearer service, GGSN creates a MBMS bearer context; Downstream in GGSN store session attribute and MBMS bearer context stream node listing, the status attribute in the MBMS bearer context is set to " Active ", and returns session to BM-SC and begin response message (Session Start Response); GGSN is after SGSN transmission session begins request, if do not receive the correct response (comprise and do not receive response or receive negative response) of SGSN in the time of setting, this moment, GGSN judged that the MBMS session of whole descendant nodes begins to fail; If receive the correct response of any one SGSN in setting-up time, then GGSN does not further operate;
The business that SGSN receives described GGSN transmission begins to return response message behind the request message, then described professional beginning request message is sent to the Access Network unit;
SGSN sends session and begins request message, and session attribute (TMGI, QoS, MBMS service area, session identification, the session duration of estimation, broadcast/group broadcast pattern, Counting indication) is provided; This message sends to all Access Network unit that are connected to this SGSN; For the broadcasting MBMS bearer service, SGSN creates a MBMS bearer context, preserves the load plane that activates in the attribute of this carrying and this flow process and the resource information of signaling plane; 2G/3G indication in SGSN store session attribute and the MBMS bearer context, status attribute in the MBMS bearer context is set to " Active ", and return session to GGSN and begin response message, be provided for TEID and the IP address of the SGSN of load plane and signaling plane, finish the activation of load plane and signaling plane resource, GGSN comes the transmitting MBMS data by this load plane; For the MBMS bearer service, if SGSN receives that a plurality of MBMS sessions begin request message, this SGSN only needs to set up a load plane and signaling plane with one of them GGSN; After the transmission session of Access Network unit began request, if do not receive the response of any Access Network unit in setting-up time, then SGSN did not do any further operation at SGSN;
In the present embodiment, when same business resolves into a plurality of son streams by hierarchical coding after, system regards each height stream as independently professional now and handles, there is not incidence relation between a plurality of son streams, just can not guarantee that so also Access Network unifies to consider to this a little stream on Resources allocation and Synchronization Control, finally make terminal can't realize that layering receives to merge and mistake occurs; Therefore, the embodiment of the invention 3 begins to have increased in the signaling (professional beginning request message) in session and is used to identify the sub-traffic identifier that this a little stream belongs to a business together, the assurance downstream node coordinates to consider this a little stream on Resources allocation and Synchronization Control, guarantee that UE realizes that layering receives the accuracy of merging; It is as follows that concrete business begins request message format:
-TMGI; Temporary Mobile Group Identity
-Sub-stream identity{optional, e.g.TMGI1, TMGI2}; Sub-traffic identifier
-MBMS Bearer Service Type; MBMS carries COS
-MBMS Session Identity, if available; MBMS session identification (if available)
-Iu Signalling Connection Identifier IE; Iu signaling connection identifier
-RAB parameters (including e.g.Allocation/Retention Priority); RAB parameter (comprise distribution, keep priority)
-PDP Type Information, ifavailable; PDP type information (if available)
-MBMS Session Duration; MBMS session persistence
-MBMS Service Area; The MBMS service-domain
-Frequency Layer Convergence Flag, ifavailable; Frequency layer convergence mark (if available)
-RA List of Idle Mode UEs, ifavailable; The Tracking Area List (if available) of Idle pattern UE
-Global CN-ID IE, only when the MBMS SESSION START message issent from a CN node towards an RNC for which the sending CN node is not thedefault CN node; Whole world core net sign
-MBMS Session Repetition Number, if available; MBMS session number of repetition (if available)
-Time to MBMS Data Transfer; The MBMS data transmission period
As above shown in the form, begin to increase in the request message traffic identifier in business, TMGI comprising other son streams that belong to a business together, can arrange this sub-traffic identifier only occurs in the configuration of base layer data place son stream, if the Access Network unit is received this message and is found wherein to comprise sub-traffic identifier, just know that this is the basic straton stream of certain business, and, know the TMGI of other son streams that belong to this business together according to the one or more TMGI signs that wherein comprise;
In addition, can also not begin to increase sub-traffic identifier in the request message, but in TMGI, do not increase under the situation of its byte length, increase sub-traffic identifier, specifically shown in the table 2 among the embodiment 2 in business;
Wherein, amended TMGI structure is in the second byte part, and 1～3 bit representation stream is numbered the length of 4～8 bit representation Temporary Mobile Group Identity contents; 3 bits can identify 8 son streams, and next professional Delamination Transmission of ordinary circumstance can not surpass 8 son streams; The length of using 5 bit identification TMGI contents simultaneously also is enough; Thereby new TMGI form has increased sub-stream information, and with originally compared the length that does not increase TMGI; BM-SC is when branch layer service of transmission, can be by signaling downstream node GGSN, SGSN and Access Network unit, the a plurality of son streams that belong to same business will be included in the signaling simultaneously, each node is found out this a little stream independently professional, banising the TMGI that puts according to each height judges, determine which sub-stream is to belong to same business, and according to son stream ID obtain which sub-stream be base layer data, which a little stream be enhancement data; Certain 3 sublayer of professional decomposition layer for example, so among the TMGI of these 3 sublayer correspondences, Temporary Mobile Group Identity IEI, Length of Temporary Mobile Group Identity contents, MBMS Service ID, MCC, MNC are identical, that different is Sub-stream ID, and it be that 0, two Sub-stream ID that strengthens straton stream joins respectively is 1 and 2 that the Sub-stream ID of basic straton flow data joins;
After GGSN, SGSN and Access Network unit receive that the session of BM-SC initiation begins message, judge a plurality of also professional corresponding TMGI that comprises in this message, just know that these several business are a plurality of sub-flow datas of certain actual MBMS business if find that wherein some professional MBMSService ID is identical, further judge Sub-stream ID, distinguish basic layer and enhancement data and carry out subsequent operation.
Described Access Network unit further also can comprise: radio network controller (RNC), wherein RNC sets up essential Radio Resource and is used for to interested terminal transmission MBMS data, and the resource of wireless access network is set up and can be transmitted the time started according to the MBMS data and dispatch; For the broadcasting MBMS bearer service, RNC creates the MBMS business contexts; In RNC, store session attribute in the MBMS business contexts, status attribute in the MBMS business contexts is set to " Active ", and return session to SGSN and begin response message, RNC can begin to comprise in the response message TEID that is used for the Iu load plane in session, and SGSN uses this TEID to come the transmitting MBMS data; If RNC receives that a plurality of MBMS sessions begin request message, only need to set up a load plane and get final product with one of them SGSN; Concrete:
Described RNC is used for receiving after described business begins request, when adopting the frequency domain layered model to carry out business when transmitting, is different straton flow distribution different carriers, identical time slot and code channel resource; When adopting the time domain layered model to carry out the business transmission, be different straton flow distribution same carrier waves, different time-gap and code channel resource; With the 3G system is example, CN initiates a broadcasting service, require to adopt the Delamination Transmission mode, and configure corresponding id information and transmission parameter for each sub-stream, after RNC obtains above-mentioned message, will be according to the layering Service configuration strategy, as adopting the frequency domain layered mode, RNC with this a little flow distribution on the identical time slot of different carrier, code channel; As adopt the time domain layered mode, RNC with this a little flow distribution on the different time-gap of same carrier wave, code channel; So just guaranteed to belong to together the resource that a plurality of sub-flow distribution of a business is coordinated; Because the transmission of base layer data is to guarantee that when system resource was not enough, RNC can preferentially guarantee the resource of base layer data;
Then, after RNC receives the sub-flow data that core network element sends over,, dispose the packet of each Transmission Time Interval correspondence, and begin to be transmitted as with data and initial each packet is numbered according to the data transmission parameters of each height stream; When adopting the frequency domain layering to carry out the business transmission, the packet of the identical numbering that each son stream of transmission is corresponding in different carrier, identical time slot and code channel; When adopting the time domain layering to carry out the business transmission, the packet of the identical numbering that each son stream of transmission is corresponding in same carrier wave, different time-gap and code channel; Concrete:
With the 3G system is example, CN initiates a broadcasting service, require to adopt the Delamination Transmission mode, and configure corresponding id information and transmission parameter for each sub-stream, after RNC obtains above-mentioned message, will be according to the layering Service configuration strategy, as adopting the frequency domain layered mode, RNC with this a little flow distribution on the identical time slot of different carrier, code channel; As adopt the time domain layered mode, RNC with this a little flow distribution on the different time-gap of same carrier wave, code channel; In data transmission procedure, it is the suitable air interface data packets for transmission form of unit that the IP bag of each height stream that RNC can transmit CN is encapsulated as with TTI according to transmission parameter, and from starting point, is numbered, as from 0 open numbering; The identical processing of The data of each height stream; When data send,, when each chronomere arrives, in coordinating resource units (different carrier, identical time slot and code channel), transmit the packet of the corresponding identical numbering of each son stream if system configuration is a frequency domain Delamination Transmission strategy; If system configuration is a time domain Delamination Transmission strategy, when each chronomere arrives, in coordinating resource units (same carrier wave, different time-gap and code channel), transmit the packet of the corresponding identical numbering of each son stream.
As can be seen, adopt system of the present invention, begin the sub-traffic identifier that the request message increase shows a plurality of son streams of same business by the business that sends at system core net, and the resource that system's Access Network is coordinated a plurality of sub-flow distribution according to transmission policy and sub-traffic identifier, and each sub-flow data carried out Synchronous Processing, it is synchronous to have guaranteed that each sub-flow data sends, and has guaranteed that terminal obtains gain and the benefit that hierarchical coding brings.
The above only is preferred embodiment of the present invention, and is in order to restriction the present invention, within the spirit and principles in the present invention not all, any modification of being done, is equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (6)
1. a multimedia broadcast/group broadcast service layered transmission method is characterized in that, this method comprises:
The multimedia broadcast/group broadcast service that receives the network side initiation begins request; The multimedia broadcast/group broadcast service that described network side is initiated begins request and comprises: core net resolves into a plurality of son streams with same business by hierarchical coding, sends session then and begins request message; Described session begins to comprise in the request message and shows that described sub-stream belongs to the sub-traffic identifier of same business; Described sub-traffic identifier comprises the Temporary Mobile Group Identity TMGI of other son streams that belong to same business;
Business information according to the different straton streams of described beginning acquisition request is different straton flow data Resources allocation also, returns response message to described network side then;
Receive described network side and receive the sub-flow data of sending behind the response message, and described sub-flow data is carried out sending after the Synchronous Processing.
2. method according to claim 1 is characterized in that:
Described sub-traffic identifier can only appear in the sub-flow message at base layer data place.
3. according to claim 1 or 2 any described methods, it is characterized in that described resource allocation further comprises:
When adopting the frequency domain layered model to carry out the business transmission, be different straton flow distribution different carriers, identical time slot and code channel resource;
When adopting the time domain layered model to carry out the business transmission, be different straton flow distribution same carrier waves, different time-gap and code channel resource.
4. method according to claim 1 is characterized in that, described Synchronous Processing further comprises:
According to the data transmission parameters of each height stream, dispose the packet of each Transmission Time Interval correspondence, and begin to be transmitted as with data and initial each packet is numbered;
When adopting the frequency domain layering to carry out the business transmission, the packet of the identical numbering that each son stream of transmission is corresponding in different carrier, identical time slot and code channel;
When adopting the time domain layering to carry out the business transmission, the packet of the identical numbering that each son stream of transmission is corresponding in same carrier wave, different time-gap and code channel.
5. multimedia broadcast/group broadcast service Delamination Transmission system is characterized in that this system comprises: core network element and Access Network unit, wherein:
Described core network element is used for initiating multimedia broadcast/group broadcast service to the Access Network unit and begins request, and receives the response message that the Access Network unit returns, and then sends sub-flow data to the Access Network unit;
Described Access Network unit is used for return response message then, and the sub-flow data that will receive carrying out sending after the Synchronous Processing according to the business information of the different straton streams of described beginning acquisition request and for different straton flow data Resources allocation;
Described core network element further comprises: broadcast/multicast service center BM-SC, Gateway GPRS Support Node GGSN and Serving GPRS Support Node SGSN, wherein:
BM-SC is used for same business is resolved into a plurality of son streams by hierarchical coding, then by GGSN, SGSN after the Access Network unit sends multimedia broadcast/group broadcast service and begins request message and receive the response message that returns the Access Network unit, send sub-flow data to the Access Network unit;
The business that GGSN receives described BM-SC transmission begins to return response message behind the request message, then described professional beginning request message is sent to SGSN;
The business that SGSN receives described GGSN transmission begins to return response message behind the request message, then described professional beginning request message is sent to the Access Network unit; Comprise in the described professional beginning request message and show that described sub-stream belongs to the sub-traffic identifier of same business; Described sub-traffic identifier comprises the Temporary Mobile Group Identity TMGI of other son streams that belong to same business.
6. system according to claim 5 is characterized in that, described Access Network unit further comprises: radio network controller (RNC);
Described RNC is used for receiving after described business begins request, when adopting the frequency domain layered model to carry out business when transmitting, is different straton flow distribution different carriers, identical time slot and code channel resource; When adopting the time domain layered model to carry out the business transmission, be different straton flow distribution same carrier waves, different time-gap and code channel resource;
And after receiving the sub-flow data that core network element sends over,, dispose the packet of each Transmission Time Interval correspondence, and begin to be transmitted as with data and initial each packet is numbered according to the data transmission parameters of each height stream; When adopting the frequency domain layering to carry out the business transmission, the packet of the identical numbering that each son stream of transmission is corresponding in different carrier, identical time slot and code channel; When adopting the time domain layering to carry out the business transmission, the packet of the identical numbering that each son stream of transmission is corresponding in same carrier wave, different time-gap and code channel.
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| CN102857478B (en) * | 2011-06-30 | 2016-09-28 | 华为技术有限公司 | media data control method and device |
| EP3001703A1 (en) * | 2014-09-29 | 2016-03-30 | Alcatel Lucent | Coverage enhancement for multicast in a cellular network |
| CN106792563A (en) * | 2015-11-23 | 2017-05-31 | 中兴通讯股份有限公司 | A kind of multimedia broadcast multi-broadcasting business processing method and system |
| US10772072B2 (en) | 2017-05-06 | 2020-09-08 | Qualcomm Incorporated | Reserved range of TMGI for receive-only mode |
| US10932095B2 (en) | 2017-11-22 | 2021-02-23 | Huawei Technologies Co., Ltd. | Method and system for multicast and broadcast services |
| CN114205839B (en) * | 2020-09-02 | 2024-11-22 | 华为技术有限公司 | Method, device and system for multi-stream associated transmission |
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