CN100433627C - System and method for broadcast and multicast of the mobile multimedia - Google Patents
System and method for broadcast and multicast of the mobile multimedia Download PDFInfo
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- CN100433627C CN100433627C CNB2006100864485A CN200610086448A CN100433627C CN 100433627 C CN100433627 C CN 100433627C CN B2006100864485 A CNB2006100864485 A CN B2006100864485A CN 200610086448 A CN200610086448 A CN 200610086448A CN 100433627 C CN100433627 C CN 100433627C
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Abstract
This invention discloses one mobile multi-media broadcast set system, which comprises program source, video servo, GPRS supportive point, DTT-H and at least one terminal, adapter device to match transmission flow. This invention also discloses one method, which comprises the following steps: on arriving the aim network through matching transmission flow, the programs select the broadcast or set type according to user number and then sending to terminal through DTT-H.
Description
Technical field
The present invention relates to the multimedia broadcasting and multicast technology, particularly utilize mobile network and terrestrial broadcasting technology to realize the system and method for Mobile Multimedia Broadcasting multicast.
Background technology
The mobile subscriber increases day by day to the demand of the Mobile Multimedia Broadcasting multicast service that comprises mobile TV, and the Mobile Multimedia Broadcasting multicast service of low-cost and high-quality has proposed more strict requirement to mobile network's bandwidth and interface-free resources.Tradition mobile network's P-2-P technology can't satisfy the requirement of broadcasting multicast service, mobile network's point can be realized broadcasting multicast service to the multiple spot technology, but frequency spectrum costliness, and eat dishes without rice or wine power and rate-constrained can't provide the multimedia programming that enriches of low-cost and high-quality to the mobile subscriber.On the contrary, terrestrial broadcast networks then utilizes terrestrial broadcasting to carry out the distribution of broadcasting service, and the multimedia programming of abundant low-cost and high-quality can be provided to the user, but lack portable terminal is received and the support of mobile real-time, interactive business.Therefore, utilize current mobile network and terrestrial broadcast networks, realize that mutual Mobile Multimedia Broadcasting multicast service is very significant to mobile operator.
In order to effectively utilize mobile network resource, the global standardsization of Wideband Code Division Multiple Access (WCDMA)/global system for mobile communications (WCDMA/GSM) organize GPRS/universal mobile telecommunications system (GPRS/UMTS) to propose multimedia broadcast-multicast service (MBMS), 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.MBMS is based on the WCDMA/GSM Packet Based Network, by increasing some new functional entitys, as broadcast multicast service center (BM-SC), the functional entity of existing packet domain such as serving GPRS support node (SGSN), Gateway GPRS Support Node (GGSN), radio network controller (RNC) and subscriber equipment (UE) etc. are increased the MBMS functions, and defined new logic shared channel and physics common signal channel and realize that interface-free resources shares.
But MBMS exists following shortcoming:
1) systematic comparison complexity; The user is in order to obtain the MBMS business, must set up MBMS bearer context and MBMS user's context by signaling, network need increase multimedia broadcast-multicast service center (MBMS-SC) physical entity newly for this reason, original GGSN, SGSN, RNC/BSC must set up, safeguard and discharge these contexts, and system implements more complicated.
2) the air protocol expense is bigger; On service layer, because the framework that the MBMS technology realizes is the transmission of IP point to multiple spot, the UDP/IP agreement is obligato, so the UDP/IP layer takies certain eating dishes without rice or wine and send bandwidth, increases the air protocol expense.
3) program is abundant inadequately, the user experience imperfection; Though the core net of MBMS can provide very strong distribution of services ability, can carry the rich video business, but, be example with 384Kbps because the downstream rate of eating dishes without rice or wine is limited, for the mobile phone TV services that require fine user experience, maximum can only be supported a program.
4) covering and speed reduce; The MBMS base station can provide up access to portable terminal, though this provides convenience for portable terminal inserts data network, can influence the downlink broadcast coverage and the speed of base station, and the covering radius of each base station and speed are reduced.
5) the standard well afoot of MBMS business, its practical application also needs to wait for a period of time.
Summary of the invention
Main purpose of the present invention is to provide a kind of system that realizes the Mobile Multimedia Broadcasting multicast, can be in conjunction with current mobile packet core network and terrestrial broadcast networks, for mobile operator provides a low solution end to end that can realize mutual Mobile Multimedia Broadcasting multicast service of cost of investment.
Another object of the present invention is to provide a kind of method that realizes the Mobile Multimedia Broadcasting multicast, the multimedia programming that mobile packet core network receives can be sent to portable terminal by terrestrial broadcast networks.
For realizing above-mentioned main purpose, the invention provides a kind of system that realizes the Mobile Multimedia Broadcasting multicast, comprise program source, video server, GPRS Support Node, terrestrial DTV transmitter and at least one portable terminal, the multimedia broadcasting and multicast program that program source or video server provide sends at least one portable terminal through GPRS Support Node and terrestrial DTV transmitter, also comprises in this system:
Adaptive device, be used for and be adapted for the transport stream that meets terrestrial broadcast networks system transmission mode and content from the broadcasting of described program source of mobile communication system or video server or the transport stream of multicast multimedia program, and send to the terrestrial DTV transmitter;
Described terrestrial DTV transmitter is eated dishes without rice or wine by terrestrial broadcasting, will be broadcast to portable terminal through adaptive transport stream.
Described adaptive device is: improve radio network controller, be used to receive the multimedia broadcasting and multicast program from described GPRS Support Node, it is adaptive and send to the terrestrial DTV transmitter that connects described radio network controller that described program is carried out transport stream.
Described improvement radio network controller further comprises:
Switching Module is used for described broadcast data is distributed to each business module;
Clock module by receiving the clock signal of satellite, is finished the clock synchronization to described Switching Module;
Resource management module is used to finish the management to the interface-free resources of described Switching Module;
Maintenance module is used for the fault message of described Switching Module is sent to client;
One or more business modules are used for described broadcast data encapsulation, and send to described terrestrial DTV transmitter, comprising the terrestrial broadcasting adaptation module.
Described improvement radio network controller links to each other with described terrestrial DTV transmitter by optical communication interface.
Described terrestrial broadcasting adaptation module specifically comprises:
The IPoA module is used to finish the processing of ATM agreement;
Data Receiving/adaptive/sending module is used for the data that receive are carried out adaptive, and sends to described terrestrial DTV transmitter;
The tunnel management module is used to the state of setting up the tunnel and safeguarding the tunnel;
The route maintenance module is used for safeguarding the routing information in a plurality of paths in tunnel;
Operating maintenance module is used to collect hardware fault and configuration management information, and reports the operational administrative center.
Described adaptive device also can be: the multimedia broadcast-multicast service center, be used for the multimedia broadcasting and multicast program that program receiving source or video server provide, the multimedia broadcasting and multicast program that is received carried out the adaptive and condition of transport stream receive and send to described GPRS Support Node.
The mobile network who links to each other with program source carries out following steps after receiving broadcasting or group broadcasting program:
The transport stream from the multimedia broadcasting and multicast program of mobile communication system that receives is adapted for the transport stream that meets terrestrial broadcast networks system transmission mode and content, and, will eat dishes without rice or wine to send to portable terminal by the terrestrial broadcasting of terrestrial DTV transmitter through adaptive multimedia programming according to definite broadcasting or the multicast mode of adopting of the number of users that receives described multimedia broadcasting and multicast program.
Describedly the multimedia broadcasting and multicast program sent to portable terminal further comprise:
Step a, mobile network judge that described multimedia broadcasting and multicast program is broadcast program or group broadcasting program, if be broadcast program, and execution in step b then; Be group broadcasting program, execution in step c;
Step b, described mobile network carry out the adaptive of transport stream on demand to described multimedia broadcasting program, and broadcast process ends by the terrestrial DTV transmitter;
Step c, described mobile network judge that whether the number of users of described multimedia multicast program surpasses setting threshold, if, execution in step b then; Otherwise execution in step d;
Steps d, described mobile network carry out clean culture, process ends at the user of described multimedia multicast program.
Carry out adaptive to multimedia broadcasting program described in the step b and broadcast further comprising:
The IP carrying is carried out to described multimedia broadcasting program in step b1, multimedia broadcast-multicast service center, and carries out the adaptive of transport stream on demand, is transferred to radio network controller by the tunnel through packet-based core networks;
Step b2, described radio network controller filter IP traffic, revert to the MPEG2 transport stream of described multimedia broadcasting program, send to the terrestrial DTV transmitter then;
Step b3, described terrestrial DTV transmitter are eated dishes without rice or wine by terrestrial broadcasting, and the MPEG2 transport stream of described multimedia broadcasting program is broadcast to portable terminal.
Described in the step b1 the adaptive of multimedia broadcasting program specifically comprised:
The broadcast group broadcast IP data that comprise multimedia broadcasting program are encapsulated, be mapped to the MPEG2 transport stream, insert programme information and million frame identification bags.
Further comprising the steps of among the described step b1:
Described multimedia broadcast-multicast service center needle produces code word to the multimedia broadcasting program after adaptive, to described program scrambling, and described code word being carried out encryption by AUC, the described program after the Entitlement Control Message of generation and Entitlement Management Message and the scrambling carries out multiplexing.
Described in the steps d program being carried out clean culture specifically comprises:
The IP carrying is carried out to the multimedia programming of clean culture in steps d 1, multimedia broadcast-multicast service center, is transferred to radio network controller by the tunnel through packet core network;
Carry out adaptive to multimedia broadcasting program described in the step b and the concrete following steps of carrying out of broadcasting:
To GGSN, described GGSN is forwarded to described multimedia broadcasting program by the GPRS serving GPRS support node and improves on the radio network controller by special I P channel transfer for step b1 ', described multimedia broadcasting program;
Step b2 ', described improvement radio network controller filter IP traffic, and carry out the adaptive of MPEG2 transport stream on demand, send to the terrestrial DTV transmitter then;
Step b3 ', described terrestrial DTV transmitter are eated dishes without rice or wine by terrestrial broadcasting, and the MPEG2 transport stream of described multimedia broadcasting program is broadcast to portable terminal.
Described in the step b2 ' to the adaptive concrete execution following steps of multimedia broadcasting program:
The broadcast group broadcast IP data that comprise multimedia broadcasting program are encapsulated, be mapped to the MPEG2 transport stream, insert programme information and million frame identification bags.
Further comprising the steps of among the described step b2 ':
Described improvement radio network controller produces code word at the multimedia broadcasting program after adaptive, to described program scrambling, and described code word is carried out encryption, and the described program after the Entitlement Control Message of generation and Entitlement Management Message and the scrambling carries out multiplexing.
Described in the steps d program is carried out clean culture and specifically carries out following steps:
Steps d 1 ', to GGSN, described GGSN is forwarded to described multimedia programming on the improvement radio network controller by the GPRS serving GPRS support node by special I P channel transfer for the multimedia programming of clean culture;
Steps d 2 ', after described radio network controller carries out grouped data pooling agreement mapping and handle IP traffic, send to respective cell, eat dishes without rice or wine to send to corresponding mobile terminal by this sub-district by moving.
The present invention has the following advantages:
(1) the present invention has made full use of the current transmission net of mobile operator, and its network configuration is simple;
(2), thereby do not take expensive mobile frequency spectrum interface-free resources because the present invention utilizes terrestrial broadcasting to eat dishes without rice or wine to replace the GPRS/UMTS downlink space interface;
(3) the present invention passes through in conjunction with mobile packet core network and terrestrial broadcast networks, can provide abundant business to mobile phone terminal with broadcast reception ability, comprise traditional mobile communication business and value-added service, the reception of mobile TV, real time business, interactively mobile multi-media service, and the data of other suitable broadcast transmission, as mass-send the reception of text, the reception of information such as advertisement, news, weather forecast, the reception of downloading business data, or the like;
(4) owing to the terrestrial DTV transmitter (DTT-H) at portable terminal does not have backward channel, therefore its big transmitting power and broadcast characteristic be can utilize, wide covering and high-throughput reached;
(5) the present invention encrypts programme content on improvement RNC or MPMB-SC, just is decrypted when needs are play on terminal, can realize the protection of programme content easily;
(6) the present invention realizes simply, and is less to the existing network change, can come into operation early.
Description of drawings
Fig. 1 is a structure chart of realizing the system of Mobile Multimedia Broadcasting multicast in the embodiments of the invention one;
Fig. 2 is the structure chart of the user-plane protocol stack of the system of realization Mobile Multimedia Broadcasting multicast in the embodiments of the invention one;
Fig. 3 is a flow chart of realizing the method for Mobile Multimedia Broadcasting multicast in the embodiments of the invention one;
Fig. 4 is a structure chart of realizing the system of Mobile Multimedia Broadcasting multicast in the embodiments of the invention two;
Fig. 5 is the structure chart of the improvement radio network controller in the embodiments of the invention two;
Fig. 6 is the structure chart of the terrestrial broadcasting adaptation module in the embodiments of the invention two;
Fig. 7 is the structure chart of the user-plane protocol stack of the system of realization Mobile Multimedia Broadcasting multicast in the embodiments of the invention two.
Embodiment
Below by drawings and Examples, technical scheme of the present invention is described in further detail.
The present invention combines current mobile packet core network and terrestrial broadcast networks, in mobile packet core network, finish adaptive to multimedia programming, give portable terminal by terrestrial broadcast networks with the multimedia programming after adaptive or multicast again, thereby provide a low solution end to end that can realize the Mobile Multimedia Broadcasting multicast service of cost of investment for mobile operator.
Embodiment one:
Present embodiment is based on the Mobile Multimedia Broadcasting multi-cast system that contains Mobile Multimedia Broadcasting multicast service center (MPMB-SC), its structure as shown in Figure 1, in this scheme, cable network partly utilizes the IP multicast or the ATM multicast-capable of GPRS/UMTS core net, distribution comprises the broadcast multicast data of mobile TV, wireless network partly utilizes the ground digital television broadcast ability, for the mobile subscriber provides abundant mobile video and data service, the adaption function of terrestrial broadcasting is realized by functional entity MPMB-SC.System shown in Figure 1 comprises:
Program source 1 is used to provide the multimedia broadcasting and multicast program;
Mobile Multimedia Broadcasting multicast service center 8, the adaptive and condition that is used to finish program receives; Mobile Multimedia Broadcasting multicast service center in the present embodiment can be described as adaptive device.
GPRS Support Node is used for the multimedia broadcasting and multicast program that program receiving source 1 and video server 2 provide, and the multimedia broadcasting and multicast program that receives is transmitted to radio network controller 5; GPRS Support Node comprises Gateway GPRS Support Node 3 and Serving GPRS Support Node 4;
Terrestrial DTV transmitter (DTT-H) 6 at portable terminal is used for broadcast data is transmitted to portable terminal 7;
In system shown in Figure 1, be sent to MPMB-SC8 from interior video server 2 or from the multimedia broadcasting and multicast program of the external network IP tunnel by special use, the multimedia broadcasting and multicast program of other content network, as the IPTV on the Internet, then can obtain by the mode that allows this broadcast multicast program in MPMB-SC 8, add specific multicast group.On MPMB-SC 8, finish the adaptive of multimedia programming, adaptive address filtering, IP packing, the single frequency network (SFN) etc. of comprising, GGSN sends to the program after adaptive by tunnel protocol or IP multicast the SGSN in downstream, after SGSN forwards the data to RNC by the Internet protocol (IPoA) on the configuration ATM, directly utilize the ATM multicast functionality that ATM switch provides among the RNC, multicast also is transmitted to each DTT-H after interface is adaptive.
Described address filtering is meant that adaptive device resolves the IP address of multimedia programming, judges whether this address is the broadcast group broadcast address, if then this multimedia programming is transferred to DTT-H through RNC; Otherwise program is transmitted to base station node B to be transmitted.
Described IP packing is meant: the broadcast group broadcast IP data that comprise the audio frequency and video business need be mapped to the TS stream of MPEG2 through encapsulation.Multi-protocols encapsulation (MPE) are adopted in the IP packing, in order to increase the reliable reception of portable terminal, can carry out the forward error correction (FEC) of RS (Reed Solomon) sign indicating number.Multimedia programming from core net is sign with the IP multicast address, and the data flow of same IP multicast address is same multimedia programming, and the data flow of different IP multicast address is different multimedia programming.The insertion of the multiplexing and PSI/SI of multimedia programming is finished in the IP packing, so that portable terminal can form electronic program guides (EPG) in view of the above.
Described single frequency network (SFN) is meant: in order to guarantee the synchronized transmissions of all DTT-Hs of multimedia programming under same RNC, the MPEG2TS stream after the IP packing needs to insert million frame identifications (MIP) bag.The time delay that million frame identification bags are used to make digital baseband signal be transferred to different launch points is identical, to guarantee that all transmitters can be on time and bit synchronously in the single frequency network.
In the present embodiment, the core net hop is based on the Packet Based Network of UMTS, Access Network is based on RNC and terrestrial broadcast networks, the protocol stack of this broadcast/multicast system comprises user plane and control plane, wherein, on user plane, the change of agreement is embodied in MPMB-SC and Access Network part, the structure of its protocol stack as shown in Figure 2:
At the MPMB-SC place, data link layer protocol is the DTB Digital Terrestrial Broadcasting agreement (DTB-H DLC) at portable terminal, DTB-H DLC agreement is finished all data link layer functions at the terrestrial broadcasting technology of portable terminal at the MPMB-SC place, that RS (ReedSolomon) sign indicating number, time slicing, the DVB TS that comprises MPE encapsulation, Ip data flows is multiplexing, the insertion of system information PSI/SI and condition reception etc.IPu is the IP layer protocol, is used for the carrying of TS flow data.GTP-U, UDP/IPn and AAL5/ATM are the former protocols havings of GPRS/UMTS packet core network, finish the transmission that is applied in core net, and wherein, AAL5/ATM is an aal protocol, and GTP-U and UDP/IPn are application layer protocol.
At the RNC place, DTB-H DLC finishes the MPEG2TS stream that the IPu data carried by data is reverted to.The transport layer functionality of the physical layer corresponding ground broadcast system of DTT-H is finished the emission function of terrestrial broadcasting, comprises chnnel coding and modulation.
At the portable terminal place, its physical layer is finished the transport layer functionality of terrestrial broadcasting, and promptly receiving function comprises and separates the mediation channel-decoding.The transport layer function of DTB-H DLC corresponding ground broadcast system is finished the extraction to multimedia programming; At the coded system of the portable terminal compression layer function of corresponding ground broadcast system H.264, finish the source coding of program.
On control plane,, between GGSN and MPMB-SC, increased a Gmb interface for the re-transmission of data and the program request of program.
In the present embodiment, broadcasting and multicast service are all integrated at MPMB-SC, are multiplexed into the MPEG2TS stream of a standard, and the mode of carrying by IP sends to GGSN.GGSN utilizes the transmittability of GPRS/UMTS packet-based core networks, sends to all SGSN in this GGSN downstream by GTP tunnel or IP multicast, and the PVC passage of each SGSN by configure dedicated is transmitted to all RNC in this SGSN downstream in the mode of IP OverATM.RNC only finishes the adaptive of interface, transmits the professional all DTT-H that give this RNC downstream, and DTT-H need not to change, and according to its original function, sends to all mobile subscribers by terrestrial broadcasting.
For multicast service, MPMB-SC is according to the mobile subscriber's who adds certain multicast group quantity, i.e. the number of users of certain multimedia broadcasting and multicast program, and selecting distributing network is to adopt NodeB or DTT-H.If number of users is less than the set threshold value of mobile operator, then adopt the NodeB mode of point-to-point; If number of users surpasses the set threshold value of mobile operator, then adopt the mode of point to the DTT-H of multiple spot.
The data of being transmitted by DTT-H, if portable terminal receives incorrect or when losing, can require MPMB-SC to retransmit by NodeB, at this moment, MPMB-SC adopts the NodeB mode of point-to-point to retransmit.
The scheme of present embodiment since on MPMB-SC, finish to the multimedia broadcasting and multicast program synchronously, and different RNCs receives is to have finished synchronous multimedia broadcasting and multicast program at MPMB-SC, can guarantee that the portable terminal that is under the jurisdiction of different RNCs receives last synchronous multimedia broadcasting and multicast program of time, therefore is suitable for having the metropolitan mobile operator of a plurality of RNC.
Adopt system shown in Figure 1 realize Mobile Multimedia Broadcasting method flow process as shown in Figure 3, specifically carry out following steps:
Here saidly be meant on demand, the data flow of initial multimedia broadcasting and multicast program may be the form of MPEG2TS stream, be at this moment do not need to carry out again adaptive, said adaptive be that the broadcast group broadcast IP data that comprise multimedia programming are encapsulated, be mapped to MPEG2TS stream, insert programme information PSI/SI and MIP bag.In addition, MPMB-SC also will encrypt and scrambling the program that does not contain code word (cw), MPMB-SC produces cw at the program after adaptive, to program scrambling, and cw being carried out encryption by AUC (CA), the program after Entitlement Control Message of generation (ECM) and Entitlement Management Message (EMM) and the scrambling carries out multiplexing;
Being provided with of threshold value need be determined according to concrete applied environment and different equipment, do not stipulate concrete span in the present invention.
Embodiment two:
Present embodiment is based on the Mobile Multimedia Broadcasting multi-cast system that improves RNC, cable network partly utilizes the IP multicast of GPRS/UMTS core net or the multicast-capable of ATM, distribution comprises the broadcast multicast data of mobile TV, wireless network partly utilizes the ground digital television broadcast ability, for the mobile subscriber provides abundant mobile video and data service.Key component is the improvement to existing RNC, by add a plurality of terrestrial broadcasting adaptation module (TBA, Terrestrial Broadcast Adapter) veneer in RNC, finishes the program adapting function in the TBA veneer.Based on the structure of the Mobile Multimedia Broadcasting multi-cast system that improves RNC as shown in Figure 4, comprising in the present embodiment:
Program source 1 is used to provide the multimedia broadcasting and multicast program;
GPRS Support Node is used for the multimedia broadcasting and multicast program that program receiving source 1 and video server 2 provide, and the program that receives is transmitted to radio network controller 5; GPRS Support Node comprises Gateway GPRS Support Node 3 and Serving GPRS Support Node 4;
Improve radio network controller 9, be used to receive multimedia broadcasting and multicast program, and this broadcast multicast program is sent to the terrestrial DTV transmitter 6 at portable terminal that connects radio network controller 9 from GPRS serving GPRS support node 4; Improvement radio network controller 9 in the present embodiment can be described as adaptive device.
At the terrestrial DTV transmitter 6 of portable terminal, be used for the multimedia broadcasting and multicast program is transmitted to portable terminal 7;
Wherein, after improvement radio network controller 9 in the present embodiment is received broadcast multicast data from core net, owing to no longer transmit through the UMTS base station radio, but through DTT-H broadcasting at terminal, therefore, need on the hardware foundation of original radio network controller, dispose multicast-capable and a functional entity, i.e. TBA veneer.
The structure of improving RNC9 as shown in Figure 5, comprising:
Switching Module 51 is used for broadcast multicast data is distributed to each business module;
Clock module 52 by receiving the clock signal of satellite, is finished the clock synchronization to Switching Module;
Resource management module 53 is used to finish the management to the interface-free resources of Switching Module;
Maintenance module 54 is used for the fault message of Switching Module is sent to client;
One or more business modules 55 are used for the broadcast multicast data encapsulation, and send to the terrestrial DTV transmitter 6 at portable terminal.Business module 55 comprises MUX plate and TBA veneer.
Multicast to the Switching Module of RNC5 from the broadcasting multicast services such as mobile TV of core net by the ATM of SGSN, RNC5 utilizes its ATM multicast, is distributed to the MUX plate of each business module, and the MUX plate directly multicasts to each TBA veneer again.TBA handles through corresponding, is distributed to corresponding DTT-H at portable terminal.
The functional structure of TBA veneer comprises as shown in Figure 6:
IPoA module 61 is used to finish the processing of ATM agreement;
Data Receiving/adaptive/sending module 62 is used for the data that receive are carried out adaptive, and sends to terrestrial DTV transmitter 6 at portable terminal;
Tunnel management module 63 is used to the state of setting up the tunnel and safeguarding the tunnel;
Route maintenance module 64 is used for safeguarding the routing information in a plurality of paths in tunnel;
Operating maintenance module 65 is used to collect hardware fault and configuration management information, and reports the operational administrative center.
Wherein, IPoA module 61 is responsible for the processing of ATM agreement, utilizes ATM to carry out IP communication; Data Receiving/adaptive/sending module is finished the processing of GTP-U agreement, and carry out necessary adaptive as required, finish the transport layer functionality of terrestrial broadcasting, as address filtering, the IP packing, single frequency network (SFN) etc. send to corresponding DTT-H at portable terminal then, if arrive the business tine form of TBA has been TS stream, and then TBA only need finish address filtering and distribution of services gets final product.
In the present embodiment, the core net hop is based on the Packet Based Network of GPRS/UMTS, Access Network is based on the RNC and the terrestrial broadcasting of changing, therefore, and on user plane, the change of agreement is embodied in the Access Network part, its protocol stack structure as shown in Figure 7, wherein, DTB-H DLC is the data link layer at the DTB Digital Terrestrial Broadcasting of portable terminal, comprise MPE-FEC and time slicing modules such as (Time-Slicing), and realize functions such as multiplexing, SFN.Wherein, MPE finishes the adaptive of data, is packaged into the needed MPEG2TS stream of terrestrial broadcasting.DTB-H DLC has realized MPE-FEC and two key functions of time slicing, is respectively applied for the mobile receiving ability of raising terminal and the life-span of battery.
MPE-FEC is that IP datagram has increased the RS error correction coding in data link layer, and as the forward error correction coding of MPE, check information will transmit in the FEC of appointment section.MPE-FEC is not compulsory in standard, but in relatively poor reception environment, suitable use MPE-FEC can accurately recover the IP data.The accessing cost for data of MPE-FEC distributes very flexible, and under the constant situation of other transmission parameter, if the verification expense brings up to 25%, then MPE-FEC can make terminal reach carrier-to-noise ratio (C/N) identical when using antenna diversity to receive.MPE-FEC provides extraordinary anti-impulse disturbances ability in addition.
The MPE-FEC frame adopts timeslice (Time-Slicing) to send, and can effectively reduce the average power consumption of terminal.Time slicing techniques adopts burst mode to transmit data, each burst timeslice transmits a business, in professional delivery time sheet, should business will occupy the total data bandwidth separately, and point out the moment that next identical services timeslice produces, terminal can receive selected business in the moment of appointment like this, do energy-efficient treatment in professional free time, adjacent cell is monitored, scan other frequency signals, test signal intensity, thereby reduce total average power consumption and realize steady between heterogeneous networks, seamless service exchange.Angle from receiver, the business datum that receives not is to adopt the continuous input mode of traditional constant rate of speed, data arrive at interval in discrete mode, i.e. burst transmits, if decoding terminal requires data rate lower but must be constant code rate, receiver can at first cushion the bursty data that receives, then the constant data flow of generating rate.
The control plane then GPRS/UMTS network with traditional is the same, is mainly used in terminal and receives the re-transmission of obliterated data and professional program request etc., and at this moment distribution of services is used the point to point system of GPRS/UMTS network.
Mobile Multimedia Broadcasting multi-cast system based on present embodiment, support broadcasting and multicast service, for broadcasting service, the broadcast data that GGSN obtains from content supplier, GTP (GPRS Tunnel Protocol by user's face, GPRS Tunnel Protocol) tunnel or IP multicast send to all SGSN in its downstream, and wherein, GTP provides the tunnel for the packet of various protocols by the GPRS backbone network.Broadcast data arrives after the SGSN, each SGSN is by the PVC passage of configure dedicated, mode with IP OverATM is transmitted to all RNC in its downstream, and RNC carries out the filtration of program and multiplexing, the insertion of particular program information/programme information PSI/SI for the IP data, finish the adaptive of MPEG2TS stream, insert the MIP bag, send to all DTT-H in its downstream, DTT-H need not to change, according to its original function, send to all mobile subscribers by terrestrial broadcasting.
For multicast service, RNC is according to the mobile subscriber number that adds certain multicast group, i.e. the number of users of certain program, and selecting distributing network is to adopt NodeB or DTT-H.If number of users is less than the set threshold value of mobile operator, then adopt the NodeB mode of point-to-point; If number of users surpasses the set threshold value of mobile operator, then adopt the mode of point to the DTT-H of multiple spot.
The data of being transmitted by DTT-H, if portable terminal receives incorrect or when losing, can require RNC to retransmit by NodeB, at this moment, RNC adopts the NodeB mode of point-to-point to retransmit.
The scheme of present embodiment since adopt improve finish on the RNC to program synchronously, if be deployed in the big city, be difficult to reach the synchronous of program between a plurality of RNC, the user who is under the jurisdiction of different RNCs may will receive nonsynchronous in time program, therefore, this programme is suitable for having only the mobile operator of the small and medium-sized cities of a RNC.
Flow process and the flow process among the embodiment one based on the method for the realization Mobile Multimedia Broadcasting multicast of the system of present embodiment are similar, difference is, adaptive and the condition of program is received among the MPMB-SC and finishes among the embodiment one, and present embodiment then is to finish in improving RNC.
Embodiment one and embodiment two have set forth different system structure and the method flow that the present invention realizes the Mobile Multimedia Broadcasting multicast, in the present invention, also the security system of this system are designed and realize.
Security Architecture of the present invention comprises network access security, network domain security, user domain safety, application domain safety and observability and configurability.Wherein, access security comprises user's authentication, the encryption of Radio Link etc., and network level safety then mainly comprises the protection of the confidentiality and integrity of data in network transmission process, generally realizes with IPsec mechanism.
For the re-transmission of obliterated data and the business of video request program point-to-points such as (VOD), fail safe is guaranteed by the Security Architecture of UMTS; For broadcasting multicast service, then mainly guarantee by the mode that condition receives by mobile operator.
Terrestrial broadcasting can adopt the dual mode realization condition to receive: the condition receiving system of a kind of IP of being based on (IP-CAS), all CAS relevant informations and can be supported time slicing techniques all in the IP data, guarantee to save power consumption.Terrestrial broadcasting standard must not supported the two-way transmission between CAS and receiver, and IP-CAS need only support that broadcast environment gets final product.Another kind of mode is to adopt the condition receiving system (DVB-CAS) of DVB common scrambling algorithm, transmits CAS information this moment at the terrestrial broadcasting multi-cast system of portable terminal and will face some problems.Because DVB-CAS use authority control information (ECM) transmits descramble key, therefore ECM can not carry out time slicing, DVB-CAS also uses EMM in addition, be used to transmit Entitlement Management Message, because the time interval of EMM is at random, terminal must be worked guaranteeing can not lose EMM always, and directly uses DVB-CAS will influence the netsurfing business.
For guaranteeing the use of DVB-CAS, terrestrial broadcasting multi-cast system at portable terminal can be made following change: for guaranteeing the carrying out of descrambling work, receiver must be finished ECM and receive, and system is by the minimum repetition period of ECM repetition rate descriptor (ECM_repetition_rate_descriptor) sign ECM.If terminal has been finished an ECM minimum period at least and received before beginning to receive business datum, then can receive an ECM at least, thereby obtain descramble key.Usually be 10s the effective time of descramble key, and receiver must guarantee that 10s finishes the descramble key reception before business datum arrives for this reason.EMM will adopt the timeslice mode to transmit.At first EMM is encapsulated as the IP datagram form, the time slicing mode of encapsulation back EMM-IP data is identical with other IP data, and adopts MPE-FEC to reduce loss of data.From the angle of receiving terminal, the IP data that are loaded with EMM are supplementary services, and it is must be received, and the EMM-IP data that recover will be sent to the DVB-CAS specific modules to the EMM information processing.
After handling by the way, DVB-CAS can not have any impact to user's roaming.
The present invention adopts the DVB-CAS conditional access mode based on TS stream, to scheme based on improvement RNC, at the RNC place program is carried out when multiplexing, finish the scrambling of TS stream, to scheme based on MPMB-SC, then at the MPMB-SC place program is carried out when multiplexing, the scrambling of finishing TS stream is to realize the fail safe of terrestrial broadcasting.
Claims (16)
1, a kind of system that realizes the Mobile Multimedia Broadcasting multicast, it is characterized in that, comprise program source, video server, GPRS Support Node, terrestrial DTV transmitter and at least one portable terminal, the multimedia broadcasting and multicast program that program source or video server provide sends at least one portable terminal through GPRS Support Node and terrestrial DTV transmitter, also comprises in this system:
Adaptive device, be used for and be adapted for the transport stream that meets terrestrial broadcast networks system transmission mode and content from the broadcasting of described program source of mobile communication system or video server or the transport stream of multicast multimedia program, and send to the terrestrial DTV transmitter;
Described terrestrial DTV transmitter is eated dishes without rice or wine by terrestrial broadcasting, will be broadcast to portable terminal through adaptive transport stream.
2, the system of realization Mobile Multimedia Broadcasting multicast according to claim 1, it is characterized in that, described adaptive device is: improve radio network controller, be used to receive the multimedia broadcasting and multicast program from described GPRS Support Node, it is adaptive and send to the terrestrial DTV transmitter that connects described radio network controller that described program is carried out transport stream.
3, the system of realization Mobile Multimedia Broadcasting multicast according to claim 2 is characterized in that, described improvement radio network controller further comprises:
Switching Module is used for described broadcast data is distributed to each business module;
Clock module by receiving the clock signal of satellite, is finished the clock synchronization to described Switching Module;
Resource management module is used to finish the management to the interface-free resources of described Switching Module;
Maintenance module is used for the fault message of described Switching Module is sent to client;
One or more business modules are used for described broadcast data encapsulation, and send to described terrestrial DTV transmitter, comprising the terrestrial broadcasting adaptation module.
4, the system of realization Mobile Multimedia Broadcasting multicast according to claim 3 is characterized in that, described improvement radio network controller links to each other with described terrestrial DTV transmitter by optical communication interface.
According to the system of claim 3 or 4 described realization Mobile Multimedia Broadcasting multicasts, it is characterized in that 5, described terrestrial broadcasting adaptation module specifically comprises:
The IPoA module is used to finish the processing of ATM agreement;
Data Receiving/adaptive/sending module is used for the data that receive are carried out adaptive, and sends to described terrestrial DTV transmitter;
The tunnel management module is used to the state of setting up the tunnel and safeguarding the tunnel;
The route maintenance module is used for safeguarding the routing information in a plurality of paths in tunnel;
Operating maintenance module is used to collect hardware fault and configuration management information, and reports the operational administrative center.
6, the system of realization Mobile Multimedia Broadcasting multicast according to claim 1, it is characterized in that, described adaptive device is: the multimedia broadcast-multicast service center, be used for the multimedia broadcasting and multicast program that program receiving source or video server provide, the multimedia broadcasting and multicast program that is received carried out the adaptive and condition of transport stream receive and send to described GPRS Support Node.
7, a kind of method that realizes the Mobile Multimedia Broadcasting multicast is characterized in that, the mobile network who links to each other with program source carries out following steps after receiving broadcasting or group broadcasting program:
The transport stream from the multimedia broadcasting and multicast program of mobile communication system that receives is adapted for the transport stream that meets terrestrial broadcast networks system transmission mode and content, and, will eat dishes without rice or wine to send to portable terminal by the terrestrial broadcasting of terrestrial DTV transmitter through adaptive multimedia programming according to definite broadcasting or the multicast mode of adopting of the number of users that receives described multimedia broadcasting and multicast program.
8, the method for realization Mobile Multimedia Broadcasting multicast according to claim 7 is characterized in that, describedly the multimedia broadcasting and multicast program is sent to portable terminal further comprises:
Step a, mobile network judge that described multimedia broadcasting and multicast program is broadcast program or group broadcasting program, if be broadcast program, and execution in step b then; Be group broadcasting program, execution in step c;
Step b, described mobile network carry out the adaptive of transport stream on demand to described multimedia broadcasting program, and broadcast process ends by the terrestrial DTV transmitter;
Step c, described mobile network judge that whether the number of users of described multimedia multicast program surpasses setting threshold, if, execution in step b then; Otherwise execution in step d;
Steps d, described mobile network carry out clean culture, process ends at the user of described multimedia multicast program.
9, the method for realization Mobile Multimedia Broadcasting multicast according to claim 8 is characterized in that, carries out adaptive to multimedia broadcasting program described in the step b and broadcast further comprising:
The IP carrying is carried out to described multimedia broadcasting program in step b1, multimedia broadcast-multicast service center, and carries out the adaptive of transport stream on demand, is transferred to radio network controller by the tunnel through packet-based core networks;
Step b2, described radio network controller filter IP traffic, revert to the MPEG2 transport stream of described multimedia broadcasting program, send to the terrestrial DTV transmitter then;
Step b3, described terrestrial DTV transmitter are eated dishes without rice or wine by terrestrial broadcasting, and the MPEG2 transport stream of described multimedia broadcasting program is broadcast to portable terminal.
10, the method for realization Mobile Multimedia Broadcasting multicast according to claim 9 is characterized in that, described in the step b1 the adaptive of multimedia broadcasting program is specifically comprised:
The broadcast group broadcast IP data that comprise multimedia broadcasting program are encapsulated, be mapped to the MPEG2 transport stream, insert programme information and million frame identification bags.
11, according to the method for claim 9 or 10 described realization Mobile Multimedia Broadcasting multicasts, it is characterized in that, further comprising the steps of among the described step b1:
Described multimedia broadcast-multicast service center needle produces code word to the multimedia broadcasting program after adaptive, to described program scrambling, and described code word being carried out encryption by AUC, the described program after the Entitlement Control Message of generation and Entitlement Management Message and the scrambling carries out multiplexing.
12, the method for realization Mobile Multimedia Broadcasting multicast according to claim 8 is characterized in that, described in the steps d program is carried out clean culture and specifically comprises:
The IP carrying is carried out to the multimedia programming of clean culture in steps d 1, multimedia broadcast-multicast service center, is transferred to radio network controller by the tunnel through packet core network;
Steps d 2, described radio network controller send to respective cell after IP traffic is carried out grouped data pooling agreement mapping processing, eat dishes without rice or wine to send to corresponding mobile terminal by this sub-district by moving.
13, the method for realization Mobile Multimedia Broadcasting multicast according to claim 8 is characterized in that, carries out adaptive to multimedia broadcasting program described in the step b and the concrete following steps of carrying out of broadcasting:
To GGSN, described GGSN is forwarded to described multimedia broadcasting program by the GPRS serving GPRS support node and improves on the radio network controller by special I P channel transfer for step b1 ', described multimedia broadcasting program;
Step b2 ', described improvement radio network controller filter IP traffic, and carry out the adaptive of MPEG2 transport stream on demand, send to the terrestrial DTV transmitter then;
Step b3 ', described terrestrial DTV transmitter are eated dishes without rice or wine by terrestrial broadcasting, and the MPEG2 transport stream of described multimedia broadcasting program is broadcast to portable terminal.
14, the method for realization Mobile Multimedia Broadcasting multicast according to claim 13 is characterized in that, described in the step b2 ' to the adaptive concrete execution following steps of multimedia broadcasting program:
The broadcast group broadcast IP data that comprise multimedia broadcasting program are encapsulated, be mapped to the MPEG2 transport stream, insert programme information and million frame identification bags.
15, according to the method for claim 13 or 14 described realization Mobile Multimedia Broadcasting multicasts, it is characterized in that, further comprising the steps of among the described step b2 ':
Described improvement radio network controller produces code word at the multimedia broadcasting program after adaptive, to described program scrambling, and described code word is carried out encryption, and the described program after the Entitlement Control Message of generation and Entitlement Management Message and the scrambling carries out multiplexing.
16, the method for realization Mobile Multimedia Broadcasting multicast according to claim 13 is characterized in that, described in the steps d program is carried out clean culture and specifically carries out following steps:
Steps d 1 ', to GGSN, described GGSN is forwarded to described multimedia programming on the improvement radio network controller by the GPRS serving GPRS support node by special I P channel transfer for the multimedia programming of clean culture;
Steps d 2 ', after described radio network controller carries out grouped data pooling agreement mapping and handle IP traffic, send to respective cell, eat dishes without rice or wine to send to corresponding mobile terminal by this sub-district by moving.
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| WO2010057347A1 (en) * | 2008-11-24 | 2010-05-27 | 中兴通讯股份有限公司 | A method and system for supporting wireless local area multimedia broadcasting |
| CN102036105A (en) * | 2010-12-30 | 2011-04-27 | 广州杰赛科技股份有限公司 | Method and system for multicasting digital TV signal monitoring instructions |
| CN102833684B (en) * | 2011-06-17 | 2019-03-15 | 中兴通讯股份有限公司 | A kind of multimedia broadcast multicast service transmission method, system and user equipment |
| CN103391277B (en) * | 2012-05-10 | 2016-08-10 | 华为技术有限公司 | media playing method, device and system |
| CN103763749A (en) * | 2013-12-06 | 2014-04-30 | 中国人民解放军理工大学 | TS-IP routing module and broadcast routing system |
| CN104837069A (en) * | 2015-04-14 | 2015-08-12 | 国家新闻出版广电总局广播科学研究院 | NGB-W system and data processing method |
| CN106791941B (en) * | 2016-12-28 | 2023-08-11 | 桂林龙隐科技有限公司 | Wireless WiFi multimedia broadcasting system and method |
| CN111356087B (en) * | 2018-12-21 | 2022-04-12 | 阿里巴巴集团控股有限公司 | Voice control method, communication switching method, device and equipment |
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