CN1825944A - Mobile video broadcasting system and method thereof - Google Patents

Mobile video broadcasting system and method thereof Download PDF

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Publication number
CN1825944A
CN1825944A CNA2005100089463A CN200510008946A CN1825944A CN 1825944 A CN1825944 A CN 1825944A CN A2005100089463 A CNA2005100089463 A CN A2005100089463A CN 200510008946 A CN200510008946 A CN 200510008946A CN 1825944 A CN1825944 A CN 1825944A
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CN
China
Prior art keywords
mobile video
video broadcast
mobile
radio broadcasting
distribution unit
Prior art date
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Granted
Application number
CNA2005100089463A
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Chinese (zh)
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CN100466724C (en
Inventor
吕林军
张毅
徐莹
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Huawei Technologies Co Ltd
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Huawei Technologies Co Ltd
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Priority to CNB2005100089463A priority Critical patent/CN100466724C/en
Publication of CN1825944A publication Critical patent/CN1825944A/en
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Publication of CN100466724C publication Critical patent/CN100466724C/en
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Abstract

This invention relates to a mobile video broadcast system and a method, in which, said system includes a wire TV system processing and transmitting video and a mobile video broadcast program distributing unit, a mobile video broadcast ground sending unit and a mobile video broadcast terminal. Said method includes: a, the wire TV system factures and sends video code streams to the mobile video broadcast program distributing unit, b, the distributing unit assembles said video code stream to radio broadcast frames to be transmitted to the mobile broadcast ground sending unit by the radio transmission net, c, the ground sending unit sends the radio broadcast frames to the mobile video broadcast terminal, d, the terminal operates the video play.

Description

A kind of mobile video broadcast system and mobile video broadcast method
Technical field
The present invention relates to field of signal transmissions, relate in particular to a kind of mobile video broadcast system and mobile video broadcast method.
Technical background
In the life now, Digital Television has become the pith in people's life, and as shown in Figure 1, present digital television system roughly is divided into two processes of transmission of video production and video.The video production process roughly is: first recorded video, such as the image tape, carry out digital tv encoder by the encoder analog video then, be made as the digital video of high definition, such as a video production is MPEG (Motion picture expertsgroup, animation expert group)-and 2TS (Transmit Stream, transmission code stream), the MPEG-4 program stream.If support broadcast mode on schedule, then digital video is stored on the video server, program request the time, directly raise out broadcast afterwards from video server, otherwise can being delivered directly to allocation matrix, the digital television signal of encoder output begins to transmit.The transport process of digital television signal is roughly as follows: digital television signal is assigned on the scrambler multiplexer of appointment by allocation matrix, by the scrambler multiplexer digital television signal is encrypted scrambler, after scrambler is finished, to send many cover videos on the passage in order transmitting, can be multiplexed with a road TS to the TS of multi-channel video for the MPEG-2 coding in a way word TV signal.TS code stream after multiplexing is at QAM (Quadrature Amplitude Modulation, quadrature amplitude modulation) modulator is modulated, after finishing, modulation is sent to set-top box before the user terminal by hfc plant, set-top box is finished the demodulation of digital television signal, set-top box is finished and can be converted to analog video again after the demodulation and send to simulated television, also can directly send on the Digital Television, so directly receiver, video.
As shown in Figure 2, the digital television protocol stack is top-down can be divided into application layer, compression layer, transport layer and transport layer.Application layer refers to the audio signal, vision signal and other signals that have completed.Compression layer refers to the data of application layer is carried out digital coding, such as audio coding, video coding and other signal encodings or the like.Transport layer is for multi-channel video being multiplexed on one road TS stream, is convenient to send, and Digital Television adopts the transmission code stream of MPEG-2/MPEG-4 as multiplex layer, transmits after multiplexing the finishing, and transmits that multiplexed signals finished by transport layer.Transport layer is meant the transmission and the reception of transport layer data, current general employing HFC, coaxial optical fiber network etc.
The radiovision technology is used gradually to some extent along with the development of new technology.One of scheme that realizes radiovision on the current wireless environment is exactly to adopt wireless broadcast technology, such as CDMA BCMCS (broadcast multicast services) technology.As shown in Figure 3, it is whole BCMCS business realizing networking diagram, PDSN (Packet Data Serving Node wherein, packet data serving node) and BSN (Broadcast ServingNode, the broadcast service node) can alternative, this scheme realizes adopting PDSN to realize the forwarding of BCMCS Business Stream.Wherein the effect of each functional entity of network is as follows respectively:
1) BCMCS Controller (BCMCS controller);
Management BCMCS session information, setting up in the process at service bearer is BSN, MS (Mobile Station, travelling carriage), BSC (Base Station Controller, base station controller)/PCF (Packet ControlFunction, Packet Control Function) provides session information.
The role who plays the part of BAKD (BAK distributor), the corresponding BAK of each BCMCS Business Stream (inserting key, Broadcast Access Key), if use encryption function, the user need utilize BAK to decipher the BCMCS Business Stream of each encryption.In addition, for same BCMCS business, its BAK changed according to the time.
The role's (if on Content Server, not realizing BAKG) who plays the part of BAKG (BAK generator).
To the content source authentication, the management service content is by the transmission of content source r to content server.
2) BCMCS Content Server (BCMCS content server);
BCMCS business tine from service source is changed into ip multicast stream and forwarding.
If do high infill layer, then realize (Content Server need realize the function of SKG (generator of ephemeral keys, the input key of cryptographic algorithm) in this case) at Content Server.
The role's (if on Controller, not realizing BAKG) who plays the part of BAKG.
3) BCMCS Content Provider (BCMCS content source);
The supplier of BCMCS content can be provided by third-party content supplier or operator oneself.
4) Subscriber Profile Database (BCMCS User Information Database);
Preserve BCMCS user and sign professional information, and RK (Register Key registration keys, with generating the TK temporary key, the BCMCS controller uses TK to encrypt BAK, sends to legal users then, can not obtain BAK to guarantee illegal user).
5) BCMCS Subscriber Profile Manager (BCMCS customer information manager);
Preserve the BCMCS User Information Database.
6) H-AAA (authentication, authorization and accounting server);
Be responsible for authentication, mandate and the record keeping of all BCMCS business of each user.
BCMCS Controller can pass through AAA, obtains the user from User Information Database and signs professional information.
Can directly visit BCMCS User Information Database and BCMCS customer information manager.
7) S-AAA (authentication, authorization and accounting server);
Be responsible for each user receives the BCMCS business in the S-AAA compass of competency authentication, mandate and record keeping.
BCMCS Controller can pass through S-AAA, and S-AAA obtains the user by H-AAA from User Information Database and signs professional information.
To some user, S-AAA also is H-AAA simultaneously.
8)PDSN；
Clean culture PDSN can communicate by letter with BSC/PCF to set up, to remove the carrying of clean culture IP stream at wireless network.
Can set up PPP with MS is connected.
9)BSN；
Function class can be communicated by letter with BSC/PCF to set up, to remove the carrying of multicast IP stream at wireless network like PDSN.
Ip multicast stream between management and the multicast router.
According to the information of obtaining by Controller, multicast IP stream is handled (as: compression of IP head, segmentation ...).
10) MR (multicast router);
The standard multicast router that meets IETF RFC.
If the stream of the multicast IP between CS and the BSN then can omit this network element by tunnel transmission.
11)BSC/PCF；
Set up, remove the carrying between MS and the BSN.
If do link layer encryption, then to realize the function of SKG.
12)BTS；
Realize the transmission on broadcast channel of Streaming Media.
The feature of this technology is that video server (BCMCS content server, BCMCS controller) is connected with radio data network, and broadcast base station and portable terminal need regularly be shaken hands.So, realize that with the BCMCS technology scheme cost of radiated television is than higher fully.
Adopt the BCMCS technology to realize the radiovision business, its service protocol stack as shown in Figure 4, wherein the IP layer is to realize that an ip multicast from the video server to the portable terminal transmits, video is discerned according to multicast IP+UDP port, and SRTP (safe wireless transportation protocol) is used for realizing video-encryption.
Summary of the invention
Purpose of the present invention just provides a kind of mobile video broadcast system, makes by existing Digital Television system is changed, and can realize mobile video broadcast.
Another object of the present invention provides a kind of mobile video broadcast method, makes by after existing digital TV video frequency broadcasting method is changed, and can carry mobile video broadcast.
For this reason, mobile video broadcast system of the present invention comprises the cable television system of making and transmitting video, it is characterized in that also comprising: mobile video broadcast program distribution unit, mobile video broadcast ground transmitting element and mobile video broadcast terminal:
Described mobile video broadcast program distribution unit receives the video code flow that cable television system transmits, and described video code flow is assembled into the radio broadcasting frame, sends to mobile video broadcast ground transmitting element by wireless transmission net;
Described mobile video broadcast ground transmitting element is sent to the mobile video broadcast terminal with the radio broadcasting frame, carries out play operation by the mobile video broadcast terminal.
Described mobile video broadcast system also comprises TU Trunk Unit, and the radio broadcasting frame that described mobile video broadcast ground transmitting element is sent carries out the signal enhancing.
Described mobile video broadcast terminal can be mobile set-top box or mobile TV.
Described mobile video broadcast program distribution unit sends the radio broadcasting frame by Abis interface.
Described mobile video broadcast program distribution unit is base station controller or radio network controller.
Described mobile video broadcast ground transmitting element is base transceiver station or Node B.
Described mobile video broadcast program distribution unit transmitting element is provided with the transmission code stream demultiplexing unit, carries out de-multiplex operation to transmitting video code flow.
Described cable television system is provided with the QAM modulating unit, and described mobile video broadcast program distribution unit is provided with the QAM demodulating unit, respectively video data is carried out modulation and demodulation and handles.
Between described cable television system and mobile video broadcast program distribution unit, transmit net transmission data by digital transmission network or simulation.
Mobile video broadcast method of the present invention may further comprise the steps:
Video code flow is made and sent to a, cable television system to mobile video broadcast program distribution unit;
B, mobile video broadcast program distribution unit are assembled into the radio broadcasting frame with described video code flow, and send to mobile video broadcast ground transmitting element by wireless transmission net;
C, mobile video broadcast ground transmitting element are sent to the mobile video broadcast terminal with described radio broadcasting frame;
D, mobile video broadcast terminal are carried out the video playback operation.
Among the described step b, described radio broadcasting frame sends by Abis interface.
Among the described step c, described radio broadcasting frame sends on eating dishes without rice or wine.
Among the described step c, described radio broadcasting frame sends on different time-derived channels.
Described steps d further comprises:
The wireless messages that d1, mobile video broadcast terminal demodulate reception arrive obtains the radio broadcasting frame;
D2, mobile video broadcast terminal are separated radio broadcasting frame payload, obtain video multiplex stream;
D3, mobile video broadcast terminal are separated video multiplex stream, obtain program stream.
Technical scheme of the present invention can make full use of current universal broadcast digital TV switching network, utilizes existing wireless device and technology as far as possible, utilizes the existing terrestrial broadcast system of broadcasting and TV to transmit network, reduces the development cost and the cost of investment of this technology.Service provider does not need to develop the Internet video service equipment.Radio Transmission Technology such as NodeB that utilizes current wireless and 3G mobile, such as the professional transmission technology of the BCMCS of CDMA EV DO, the MBMS Radio Transmission Technology of WCDMA, particularly technical at radio physical layer, utilize current prior art, reduce development cost and risk.
On service layer, simplify wireless processing protocol, simplify network configuration, the investment operation cost of reduction system and terminal.The UDP/IP agreement of transport layer can send bandwidth so saved certain eating dishes without rice or wine not in the transmission of eating dishes without rice or wine.Because the base station power of radio broadcasting net strengthens, thus coding such as RS can be removed, thus improve certain radio open bandwidth.Radio broadcasting net base station does not have backward channel, does not have so-called near-far interference, so can remove the control procedure of complexity such as power control.
Because mobile video broadcast program distribution unit only provides forward direction to send, and does not have backward channel, thus forward transmission power can improve, thereby enlarge broadcast coverage, save radiated television investor's cost.
Description of drawings
Fig. 1 is the schematic diagram of broadcast digital TV system in the prior art;
Fig. 2 is a broadcast digital TV protocol stack schematic diagram in the prior art;
Fig. 3 is the radiovision networking schematic diagram that available technology adopting CDMA BCMCS technology realizes;
Fig. 4 is that available technology adopting CDMA BCMCS technology realizes Digital Television radio broadcasting protocol stack schematic diagram;
Fig. 5 is that the present invention changes the schematic diagram of design to existing mobile communication network device;
Fig. 6 is the structural representation of the mobile video broadcast system of the embodiment of the invention one;
Fig. 7 is that the embodiment of the invention one adopts metropolitan area network to transmit the schematic diagram of video code flow;
Fig. 8 is the schematic flow sheet of the embodiment of the invention one;
Fig. 9 is the protocol stack schematic diagram of the embodiment of the invention one;
Figure 10 is the structural representation of the mobile video broadcast system of the embodiment of the invention two;
Figure 11 is the schematic diagram that the embodiment of the invention two is utilized udp port identification transmission code stream;
Figure 12 is the schematic diagram that the embodiment of the invention two is utilized the different transmission code streams of granule signaling bearer;
Figure 13 is the protocol stack schematic diagram of the embodiment of the invention two;
Figure 14 is the protocol stack schematic diagram of the embodiment of the invention three;
Figure 15 is the structural representation of the mobile video broadcast system of this aspect embodiment four.
Embodiment
Below in conjunction with Figure of description the specific embodiment of the present invention is described.
Analysis according to existing digital television broadcasting system protocol stack shown in Figure 2, we can replace transport layer is wireless transport layer, transform current transport layer, to connect radio transmission apparatus, can be after lower system to change, current digital television broadcasting operator can manage mobile video.
As shown in Figure 5, be that the present invention changes existing mobile communication network device, make its schematic diagram that can be applied to mobile video broadcast system of the present invention, as seen from the figure, the present invention can make following change:
The technical program is MTB (Mobile Telebvision Broadcast mobile video broadcast) technology, MTB-PDS in the mobile video broadcast technology (mobile video broadcast program distribution unit) and MTB-TTX (mobile video broadcast ground transmitting element) can use simple transformation of current 3G wireless device to form, thereby reduce the cost of investment of development cost and mobile video service provider.For the equipment of CDMA2000, mobile video broadcast program distribution unit can use BSC to transform, and mobile video broadcast ground transmitting element can use BTS to transform, and utilizes CDMA BCMCS technology to realize the transmission of radio broadcasting frame.For the equipment of WCDMA, mobile video broadcast program distribution unit can use RNC to transform, and mobile video broadcast ground transmitting element can use NodeB to transform, and utilizes WCDMA MBMS technology to realize the transmission of radio broadcasting frame.
Referring to Fig. 5, the base station controller transformation of mobile video broadcast program distribution unit by using 3G:
1) constant substantially on the hardware (variation of hardware can with reference to following each technical scheme difference)
2) only keep the relevant forward channel message of wireless broadcast technologies,, so only keep the transmission of the forward direction message of CDMABCMCS technology, other protocol message Close Alls if adopt CDMA EV DO.If adopt WCDMA BSC, so only keep the transmission of the forward direction message of WCDMA MBMS technology, other protocol message Close Alls.
3) need to increase and radio and television transmit net to connection function.
Referring to Fig. 5, mobile video broadcast ground transmitting element utilizes the NodeB transformation:
1) transforms back base station reverse channel and do not receive, do not exist and move the near-far interference that inserts, so broadcast base station can be controlled without power.Cancelled the duplexer of radio frequency, it is just passable only to keep single worker's transmission, and receiving treatment channel does not in addition need yet, and has reduced the Material Cost of base station.
2) forward direction can be use up the maximum power transmission, covers big zone as far as possible.
3) forward direction of improved mobile video broadcast ground transmitting element and the former base station technology of eating dishes without rice or wine, the base band technology is all identical.
4) wherein Abis interface (interface between base station controller and the base transceiver station) between mobile video broadcast ground transmitting element, the mobile video broadcast program distribution unit and original BSC, the Abis interface between the BTS are identical.
The mobile video broadcast terminal is also utilized the 3G mobile transformation:
1) the bottom physical layer (comprising the technology of eating dishes without rice or wine and base band technology) of reservation 3G mobile.
2) processing of reservation broadcast technology agreement.
3) remove the sending function of backward channel.
4) increase the processing television signals that multicasting technology carries.
5) when the mobile video broadcast terminal when receiving radiated television, can not on this carrier frequency, connect, because network does not receive.
Embodiment one:
It is transparent to wireless transmission device that the present invention transmits code stream.Transmit code stream through after transmitting net arrival wireless transmission device, the intact wireless terminal that sends to of wireless transmission device.Transmission net in this scheme need adopt digital transmission network, such as adopt metropolitan area network or IP network can, Fig. 6 is an example that utilizes metropolitan area network to transmit, it adopts the DS3 signal to transmit digital television code stream.
As shown in Figure 7, be the structural representation of present embodiment mobile video broadcast system, as seen from the figure, the system configuration of present embodiment specifically comprises with the lower part:
Cable television system: this part and prior art are basic identical, are used for making and transmitting video.Cable television system sends to mobile video broadcast program distribution unit with the video of making by transmitting net, is responsible for video distribution is handled by it.
This mobile video broadcast system is provided with mobile video broadcast program distribution unit, be used to receive the video code flow that cable television system transmits, and described video code flow is assembled into the radio broadcasting frame, send mobile video broadcast ground transmitting element to by Abis interface.
This mobile video broadcast ground transmitting element is sent to the mobile video broadcast terminal with the radio broadcasting frame that mobile video broadcast program distribution unit transmits, and carries out play operation by the mobile video broadcast terminal equipment.
This mobile video broadcast terminal can be provided with set-top box or direct mobile TV, by set-top box the radio broadcasting frame that receives is carried out demodulation, obtains original video data, and is play.Also can not adopt the mode of set-top box, directly utilize digital mobile video broadcasting terminal to carry out demodulation, and play.
Owing in radio broadcasting frame process of transmitting, have the wireless signal relaxation phenomenon and produce, therefore in this system, TU Trunk Unit (Repeater) can also be set, the radio broadcasting frame that described mobile video broadcast ground transmitting element is sent carries out the signal enhancing.
As shown in Figure 8, be the schematic flow sheet of mobile video broadcast method of the present invention, visible embodiment one can comprise the steps: in conjunction with this flow chart
Video code flow is made and sent to S11, cable television system to mobile video broadcast program distribution unit;
The concrete scheme of video code flow is made and sent to cable television system, can adopt following steps:
S111, encoder encodes form program stream;
Video information is through behind the encoder, and each video frequency program goes out 1 road program stream.An encoder can go out a plurality of program stream.
S112, allocation matrix unit are dispensed to the scrambler multiplexer with program stream;
S113, scrambler multiplexer are encrypted scrambler and multiplexing process to program stream, obtain video multiplex stream.
The scrambler multiplexer is encrypted scrambler to cable TV, after scrambler is finished, sends many cover video frequency programs on the passage in order to transmit at No. one cable TV, and wherein a plurality of program stream transmission code streams of MPEG-2 coding are multiplexed with one tunnel transmission multiplexing code stream; The MPEG-4 coding is multiplexed into a plurality of MPEG-4 program stream on one road MPEG-4 multiplexing code stream.
S114, cable television system send to mobile video broadcast program distribution unit with multiplexing code stream.
Code stream after multiplexing can (DS3 be sent to mobile video broadcast program distribution unit on ATM), also can be sent to mobile video broadcast program distribution unit by IP network at the road signal that transmits net.
S12, mobile video broadcast program distribution unit are assembled into the radio broadcasting frame with described video code flow, and send to mobile video broadcast ground transmitting element by wireless transmission net through Abis interface;
Mobile video broadcast program distribution unit solves the video multiplex code stream from transmit signal (for example DS3) after, elder generation's demultiplexing code stream solves each video frequency program, according to carrier frequency ability some video frequency programs are multiplexed with one road multiplexing code stream (if only can send 4 videos such as a carrier frequency then, only 4 program stream are multiplexed with a multiplexing code stream so at the most), multiplexing code stream is loaded on the radio broadcasting frame.
S13, mobile video broadcast ground transmitting element are sent to the mobile video broadcast terminal with described radio broadcasting frame;
Mobile video broadcast ground transmitting element utilizes the radio broadcasting physical-layer techniques to send to the mobile video broadcast terminal on eating dishes without rice or wine.
Described radio broadcasting frame can send on different time-derived channels.
S14, mobile video broadcast terminal are carried out the video playback operation.
The mobile video broadcast terminal can be carried out following operation after receiving the radio broadcasting frame:
The wireless data information that S141, mobile video broadcast terminal demodulate reception arrive obtains the radio broadcasting frame;
S142, mobile video broadcast terminal demodulation radio broadcasting frame payload obtain video multiplex stream;
S143, mobile video broadcast terminal demodulated video multiplex stream obtain program stream.
The mobile video broadcast terminal is separated program stream according to code stream, for example for MPEG-2, then separates the MPEG-2 program stream according to transmission code stream, for MPEG-4, then solves the MPEG-4 program stream according to the MPEG-4 multiplexing code stream.Then according to the program stream displaying video.
Embodiment two:
Present embodiment is to adopt the coding can carry transmission on a plurality of agreements, such as MPEG-4, H.264.Video data is through behind the video coding, no longer transmit the coding of code stream, each transmission code stream or each multiplexing code stream only carry a video frequency program, each video frequency program transmission code stream or multiplexing code stream are directly through transmitting the wireless broadcast system that is sent to mobile video broadcast ground transmitting element on certain subsignal of net or the IP network, wireless broadcast system needn't provide any demultiplexing, multiplexer, can be multiplexed into carrying signal on the different carrier frequency.As shown in figure 10, be the structural representation of present embodiment, it has omitted allocation matrix and relevant portions such as scrambling, multiplexer as seen from the figure.
According to flow chart shown in Figure 8, the transport process of cable television system is roughly as follows in the present embodiment as can be seen:
Video code flow is made and sent to S21, cable television system to mobile video broadcast program distribution unit;
Specifically can comprise:
S211, video are through behind the encoder, and each video goes out 1 road video frequency program transmission code stream.An encoder can go out a plurality of program transmission code streams.
The video of S212, encoder output is directly inputted on the interface single plate, and the function of interface single plate is to be carried to vision signal on the signal that transmits net and to transmit different program transmission code streams to mobile video broadcast program distribution unit.
S22, mobile video broadcast program distribution unit are assembled into the radio broadcasting frame with described video code flow, and send to mobile video broadcast ground transmitting element by wireless transmission net;
The program transmission code stream need be discerned in mobile video broadcast program distribution unit.If transmitting net is IP network, can adopt IP carrying encapsulated delivery code stream so, distinguish transmission code stream by udp port, as shown in figure 11.If transmitting net is the Metro metropolitan area network, can uses each low order to transmit signal DS0 so and transmit each video transmission code stream, as shown in figure 12.After mobile video broadcast program distribution unit obtains video flowing, program stream is loaded on the radio broadcasting frame.
Mobile video broadcast program distribution unit is distributed to the radio broadcasting frame on the different mobile video broadcast ground transmitting elements by Abis interface, be divided into some logic broadcast channels during for each carrier frequency, different logic broadcast channels sends different program stream.Mobile video broadcast ground transmitting element utilizes the radio broadcasting physical-layer techniques to send to wireless terminal on eating dishes without rice or wine.
S23, mobile video broadcast ground transmitting element are sent to the mobile video broadcast terminal with described radio broadcasting frame;
S24, mobile video broadcast terminal are carried out the video playback operation.
The mobile video broadcast terminal at first demodulates wireless signal, solves the radio broadcasting frame.Separate radio broadcasting frame payload then and draw this program stream, then according to the program stream displaying video.
The MPEG-2/MPEG-4 coding of the current digital ground high definition of suitable transmission of this programme.
In this programme, because it is multiplexing that Digital Television switching center no longer carries out program stream, so mobile video broadcast program distribution unit is distributed to mobile video broadcast ground transmitting element according to transmitting after the indication of signal or IP bag port is assembled into the radio broadcasting frame to different program stream.Mobile video broadcast ground transmitting element uses the wireless-modulated technology to send the radio broadcasting frame.For the blind area that can not cover, can adopt relay station Repeater to cover.
The protocol stack of embodiment two is referring to shown in Figure 13.Owing to do not have multiplexing to mobile video broadcast ground transmitting element from digital center, video is after mobile video broadcast program distribution unit is distributed, and mobile video broadcast ground transmitting element can utilize the multiplexing different program stream of the wireless multiplex technique of eating dishes without rice or wine.Such as the BCMCS technology that adopts CDMA, adopt the broadcast sub-channels of time-division, each broadcast sub-channels sends a program stream.
This programme is fit to MPEG-4, H.264 waits video coding technique.
Because on a carrier frequency, can send different program stream by time division way, so portable terminal can only be selected the sending time slots of institute's receiver, video, so the technical program can be saved the terminal electric energy.
Embodiment three:
The network diagram of present embodiment is with embodiment one.Different with embodiment one is the demultiplexing equipment of built-in transmission code stream on wireless transmission device, and wireless device directly sends the program stream behind the demultiplexing.
The wireless broadcast system demultiplexing transmits code stream, and radio broadcasting equipment comprises mobile video broadcast program distribution unit and mobile video broadcast ground transmitting element.Mobile video broadcast program distribution unit directly sends program stream according to the carrier frequency configuration of wireless broadcast system, be distributed to mobile video broadcast ground transmitting element after then different multiplexing code streams being assembled into the radio broadcasting frame, mobile video broadcast ground transmitting element can send different program stream on different time-derived channels.The protocol stack of embodiment three is handled as shown in figure 14.The scheme of embodiment three can allow all program stream to be multiplexed into one to transmit on the code stream transmitting online the transmission, can use a shared channel transfer video code flow (for example 1 DS3 signal) between cable television system and the mobile video broadcast program.
With reference to schematic flow sheet shown in Figure 8, the transport process of cable television system is roughly as follows:
Program stream is made and sent to S31, cable television system to mobile video broadcast program distribution unit;
S311, video TV are through behind the encoder, and each video goes out 1 tunnel video transmission code stream.An encoder can go out a plurality of video transmission code streams.
S312, allocation matrix are redistributed to video on the scrambler multiplexer of appointment;
S313, scrambler multiplexer are encrypted scrambler to Digital Television, and after scrambler was finished, in order to send many cover videos on a way word transmission of television passage, wherein a plurality of video transmission code stream multiplexs of MPEG-2 coding were one road transmission code stream; The MPEG-4 coding is multiplexed into a plurality of MPEG-4 program stream on one road MPEG-4 multiplexing code stream.
S314, the code stream after multiplexing can (DS3 be sent to mobile video broadcast program distribution unit on ATM), also can be sent to mobile video broadcast program distribution unit by IP network at the road signal that transmits net.
S32, mobile video broadcast program distribution unit are assembled into the radio broadcasting frame with described video code flow, and send to mobile video broadcast ground transmitting element by wireless transmission net;
Mobile video broadcast program distribution unit solves the TV multiplexing code stream from transmit signal (for example DS3) after, first demultiplexing code stream solves each program stream, and program stream is loaded on the radio broadcasting frame.
Mobile video broadcast program distribution unit is distributed to the radio broadcasting frame on the different mobile video broadcast ground transmitting elements by Abis interface, be divided into some logic broadcast channels during for each carrier frequency, different logic broadcast channels sends different program stream.
S33, mobile video broadcast ground transmitting element are sent to the mobile video broadcast terminal with described radio broadcasting frame;
Mobile video broadcast ground transmitting element utilizes the radio broadcasting physical-layer techniques to send to wireless terminal on eating dishes without rice or wine.
S34, mobile video broadcast terminal are carried out the video playback operation.
The mobile video broadcast terminal at first demodulates wireless signal, solves the radio broadcasting frame.Separate radio broadcasting frame payload then and draw this program stream, then according to the program stream broadcast program.
This programme is fit to send the codings such as MPEG-2/MPEG-4/H.264 of current digital ground high definition.Because on a carrier frequency, can send different program stream by time division way, so portable terminal can only be selected the sending time slots of institute's receiver, video, so the technical program can be saved the terminal electric energy.
Embodiment four
The technical program is to use the transmission net of simulation, and the radio and TV operator can use existing Digital Television to transmit network as far as possible like this, such as HFC, and networks such as coaxial cable.Send to the wireless transmission device merchant after the transmission code stream process QAM modulation with Digital Television, transport layer, application layer and compression layer remain unchanged.System configuration is roughly as Figure 15.
According to Fig. 8, the transport process of cable television system is roughly as follows:
Program stream is made and sent to S41, cable television system to mobile video broadcast program distribution unit;
S411, video TV are through behind the encoder, and each TV programme goes out 1 tunnel TV programme TS stream.An encoder can go out a plurality of TV programme TS streams.
S412, allocation matrix are redistributed to Digital Television on the scrambler multiplexer of appointment;
S413, scrambler multiplexer are encrypted scrambler to Digital Television, and after scrambler was finished, in order to send many cover TV programme on a way word transmission of television passage, wherein a plurality of TV programme TS of MPEG-2 coding were multiplexed with one road TS; The MPEG-4 coding is multiplexed into a plurality of MPEG-4 program stream on one road MPEG-4 multiplexing code stream.
S414, the code stream after multiplexing through the QAM modulation after, the metropolitan area network by simulation is sent to mobile video broadcast program distribution unit.
S42, mobile video broadcast program distribution unit are assembled into the radio broadcasting frame with described video code flow, and send to mobile video broadcast ground transmitting element by wireless transmission net;
Mobile TV broadcast program distribution unit is demodulation QAM signal at first, solve the TV multiplexing code stream after, first demultiplexing code stream solves each TV programme.
If adopt each carrier frequency to send a multiplexing TS stream, mobile TV broadcast program distribution device unit is multiplexed with one road multiplexing code stream (if only can send 4 TV programme such as a carrier frequency according to carrier frequency ability with some TV programme so, only 4 TV programme code stream multiplexs are a multiplexing code stream so at the most), multiplexing code stream is loaded on the radio broadcasting frame, and the appointment carrier frequency that sends to TTX then sends.Portable terminal need receive the multiplexing code stream stream of whole carrier frequency like this, and solves all TV programme code streams of this carrier frequency broadcast, relatively power consumption, in order to economize on electricity, the technology that then needs other, such as transmitting bitstream layers introducing timeslice Predicting Technique, needed technological transformation is bigger.
If adopt each carrier frequency to send a TV code flow (on a carrier frequency, be divided into the logic broadcast channel by time division way, on different logic broadcast channels, send different TV programme code streams), after PDS solves the TV programme code stream so, directly sending TTX sends to the appointment logic broadcast channel of specifying carrier frequency, portable terminal then can only be selected the sending time slots of institute's program receiving, so portable terminal can be saved the terminal electric energy.
Mobile video broadcast program distribution unit is distributed on the different mobile video broadcast ground transmitting elements by Abis interface, is divided into some logic broadcast channels during for each carrier frequency, and different logic broadcast channels sends different program stream.
S43, mobile video broadcast ground transmitting element are sent to the mobile video broadcast terminal with described radio broadcasting frame;
Mobile video broadcast ground transmitting element utilizes the radio broadcasting physical-layer techniques to send to wireless terminal on eating dishes without rice or wine.
S44, mobile video broadcast terminal are carried out the video playback operation.
The mobile video broadcast terminal at first demodulates wireless signal, solves the radio broadcasting frame.
Separate radio broadcasting frame payload then and draw the TV programme multiplexing code stream.
Separate program stream according to code stream again,, then separate the MPEG-2 program stream,, then solve the MPEG-4 program stream according to the MPEG-4 multiplexing code stream for MPEG-4 according to TS for example for MPEG-2.
At last according to the program stream broadcast program.
The technical scheme of this embodiment is to increase qam demodulator on MTB-PDS.The simulation that can still keep broadcasting and TV like this transmits net, such as networks such as HFC, coaxial cables.
Technical scheme of the present invention can make full use of current universal broadcast digital TV switching network.Service provider does not need to develop the Internet video service equipment.
Because mobile video broadcast program distribution unit only provides forward direction to send, and does not have backward channel, thus forward transmission power can improve, thereby enlarge broadcast coverage, save radiated television investor's cost.
On service layer, the UDP/IP agreement of transport layer can send bandwidth so saved certain eating dishes without rice or wine not in the transmission of eating dishes without rice or wine.Because the base station power of radio broadcasting net strengthens, thus coding such as RS can be removed, thus improve certain radio open bandwidth.Radio broadcasting net base station does not have backward channel, does not have so-called near-far interference, so can remove the control procedure of complexity such as power control.
Video need not transmit in radio data network, and utilizes current existing video delivery network as far as possible, thus technology, the investment all simplify.
The above is the preferred embodiments of the present invention only, is not limited to the present invention, and for a person skilled in the art, the present invention can have various changes and variation.Within the spirit and principles in the present invention all, any modification of being done, be equal to replacement, improvement etc., all should be included within the claim scope of the present invention.

Claims (14)

1, a kind of mobile video broadcast system comprises the cable television system of making and transmitting video, it is characterized in that also comprising: mobile video broadcast program distribution unit, mobile video broadcast ground transmitting element and mobile video broadcast terminal:
Described mobile video broadcast program distribution unit receives the video code flow that cable television system transmits, and described video code flow is assembled into the radio broadcasting frame, sends to mobile video broadcast ground transmitting element by wireless transmission net;
Described mobile video broadcast ground transmitting element is sent to the mobile video broadcast terminal with the radio broadcasting frame, carries out play operation by the mobile video broadcast terminal.
2, mobile video broadcast system as claimed in claim 1 is characterized in that also comprising TU Trunk Unit, and the radio broadcasting frame that described mobile video broadcast ground transmitting element is sent carries out the signal enhancing.
3, mobile video broadcast system as claimed in claim 1 is characterized in that the mobile video broadcast terminal can be mobile set-top box or mobile TV.
4, mobile video broadcast system as claimed in claim 1 is characterized in that described mobile video broadcast program distribution unit sends the radio broadcasting frame by Abis interface.
5, mobile video broadcast system as claimed in claim 1 is characterized in that described mobile video broadcast program distribution unit is base station controller or radio network controller.
6, mobile video broadcast system as claimed in claim 1 is characterized in that described mobile video broadcast ground transmitting element is base transceiver station or Node B.
7, mobile video broadcast system as claimed in claim 1 is characterized in that described mobile video broadcast program distribution unit transmitting element is provided with the transmission code stream demultiplexing unit, carries out de-multiplex operation to transmitting video code flow.
8, mobile video broadcast system as claimed in claim 1, it is characterized in that described cable television system is provided with the QAM modulating unit, described mobile video broadcast program distribution unit is provided with the QAM demodulating unit, respectively video data is carried out modulation and demodulation and handles.
9, mobile video broadcast system as claimed in claim 1 is characterized in that between described cable television system and mobile video broadcast program distribution unit, transmits net transmission data by digital transmission network or simulation.
10, a kind of mobile video broadcast method is characterized in that may further comprise the steps:
Video code flow is made and sent to a, cable television system to mobile video broadcast program distribution unit;
B, mobile video broadcast program distribution unit are assembled into the radio broadcasting frame with described video code flow, and send to mobile video broadcast ground transmitting element by wireless transmission net;
C, mobile video broadcast ground transmitting element are sent to the mobile video broadcast terminal with described radio broadcasting frame;
D, mobile video broadcast terminal are carried out the video playback operation.
11, mobile video broadcast method as claimed in claim 10 is characterized in that among the described step b that described radio broadcasting frame sends by Abis interface.
12, mobile video broadcast method as claimed in claim 10 is characterized in that among the described step c that described radio broadcasting frame sends on eating dishes without rice or wine.
13, mobile video broadcast method as claimed in claim 12 is characterized in that among the described step c that described radio broadcasting frame sends on different time-derived channels.
14, mobile video broadcast method as claimed in claim 10 is characterized in that described steps d, further comprises:
The wireless messages that d1, mobile video broadcast terminal demodulate reception arrive obtains the radio broadcasting frame;
D2, mobile video broadcast terminal are separated radio broadcasting frame payload, obtain video multiplex stream;
D3, mobile video broadcast terminal are separated video multiplex stream, obtain program stream.
CNB2005100089463A 2005-02-25 2005-02-25 Mobile video broadcasting system and method thereof Expired - Fee Related CN100466724C (en)

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