CN102299762B - Wireless NGB (next generation broadcasting network) system and adaptive regulating method of channels - Google Patents
Wireless NGB (next generation broadcasting network) system and adaptive regulating method of channels Download PDFInfo
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- CN102299762B CN102299762B CN201010217694.6A CN201010217694A CN102299762B CN 102299762 B CN102299762 B CN 102299762B CN 201010217694 A CN201010217694 A CN 201010217694A CN 102299762 B CN102299762 B CN 102299762B
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Abstract
The invention discloses a wireless NGB (next generation broadcasting network) system with an interactive function and an adaptive regulating method of channels. In the method, a broadcasting base station encodes and modulates program data according to channel state information, and then transmits a wireless program signal to a wireless terminal; the wireless terminal receives the wireless program signal and collects channel state information, and feeds the channel state information back to an interactive base station in a wireless signal way; the interactive base station transmits the channel state information to a broadcasting base station through a sub-system of a broadcasting backbone network; and the broadcasting base station regulates the encoding and modulating mode according to the received channel state information, encodes and modulates the program data provided by the sub-system of the broadcasting backbone network, and transmits a wireless program signal to the wireless terminal in a broadcasting or multicasting mode. According to the system and the method, channel information is fed back in an interactive mode, so that the purpose of adaptively regulating channel encoding and modulation can be achieved according to the channel information.
Description
Technical field
The present invention relates to broadcasting television technology field, particularly relate to the radiated television net system of future generation and self-adaptive regulation method of channel with interactive function.
Background technology
Broadcasting and television network, as the important component part of China's information infrastructure, is the most universal information tool and the information carrier the most easily of sensible huge numbers of families.Through the development of many decades, China's radio and television mixed mulch rate more than 96.95%, become cover most populous, the multiple means such as central and local governments combine, wired, wireless, satellite in the world and broadcasting and television network.Simultaneously along with the development of digital technology, network technology and Two-way, interaction techniques, traditional media transforms to New Media, the new media forms such as the digital interactive television occurred in recent years, Web TV, terrestrial wireless Digital Television, mobile multimedia broadcast television, also for broadcast television industry brings new opportunity and challenge.
Traditional broadcasting and television network, owing to being unidirectional radio network, does not have reverse information transfer channel, therefore, the various advantages that modern digital wireless technology is brought: as the optimum reception of signal, the raising of spectrum efficiency, the increase etc. of power system capacity, all can not be applied.
For this situation, the end of the year 2008, the Department of Science and Technology and SARFT(The State Administration of Radio and Television) endorsed " national high performance wideband information network and Chinese Next generation broadcasting network autonomous innovation cooperation agreement book ", determine with " high performance wideband information network (3TNet) " core technology of autonomous innovation as supporting, based on the achievement of existing cable TV digitalization and mobile multimedia broadcast television (CMMB), structure is applicable to China's national situation, " integration of three networks ", wire and wireless combines, the Next generation broadcasting network (NextGeneration Broadcasting network---NGB) of full process and full network.
Along with the quickening day by day of " Next generation broadcasting network (NGB) ", " integration of three networks " process, the channel that people obtain broadcasters is more and more extensive, and the media content of demand and form are also more and more tending towards diversified, personalized.Original unidirectional, single radio and television services pattern more and more can not adapt to the demand of people for media services.New Media Technology carries the advantages such as communications, channel, capital and emerges rapidly, and constantly shunting belongs to audient and the advertisement of traditional tv media, brings new challenge to Chinese tradition TV media.Have the traditional tv media of content resource advantage and underlying network resources, also wish constantly bringing forth new ideas by technology, the new media forms such as UNE TV media, explore new development and profit model.
The investigation and application in recent global broadband wireless access field is very active, focus constantly occurs, comprise broadband fixed radio access technology, WLAN technology, WiMAX technology, UWB technology etc., this is effectively transmitting and is introducing new technological development direction in covering also to radio network of future generation---radio and television wireless network (NGB-W) of future generation.
Radio and television wireless network of future generation is in conjunction with the advantage of radio and television Radio Transmission Technology and wireless broadband communication technology, the transmission forming nationwide " Incorporate " covers system, and be laterally connected with radio and television wired network (NGB-C) of future generation, therebetween realize seamless access in network layer, finally realize the full process and full network seamless coverage of NGB.Meanwhile, NGB-W and Broadcasting Cable Network, also can realize between telecommunications network and the Internet interconnecting, be have general internuncial ubiquitous network.
The research of radio and television wireless network of future generation is based on existing radio and television wireless transmission correlation technique achievement, in conjunction with advanced wireless backhaul access technology, take into full account broadcast television service characteristic, build and support broadcast, multicast, clean culture, the radio and television wireless network (NGB-W) of future generation that combines alternately, make it have two-way interaction framework, ultrahigh speed bandwidth, controlled believable ability and open business platform, diversified integration of three networks business can be carried.
In original radio and television wireless network, with the addition of the access technology of alternating transmission information, this just makes in radio and television wireless network, use advanced wireless communication technology (such as adaptive coding and modulating AMC technology) to become possibility.
Adaptive coding and modulating AMC is an emerging wireless technology, and its promise realizes obtaining maximum spectrum efficiency with minimum cost.Adopt AMC technology, provide Large Copacity business by wireless link and improve link utilization situation, the cost of radio frequency (RF) equipment can be reduced and be used for maintaining the operational overhead of these Large Copacity link bandwidths.Depend on link condition, AMC makes the modulation of a link and forward error error correction (FEC) dynamic change, but can not lose any data during the transmission, and keep maximum link spectral utilance in any given time under any link condition.Adopt advanced adaptive channel encoding and modulation technique, comprise advanced LDPC code, Turbo code, HARQ and adaptive coding modulation, and for business and channel, the compatibility of multi-rate coding structure supporting h-arq and adaptive coding is proposed.
At present, how to realize radio and television wireless network of future generation and how channel self-adapting coded modulation in this radio and television wireless network, not yet reach unified technical scheme.
Summary of the invention
Technical problem to be solved by this invention is, provides a kind of method of radio and television wireless network system of future generation and channel self-adapting adjustment, for realize can be mutual the object of self-adaptative adjustment is carried out to chnnel coding and modulation.
In order to solve the problem, the present invention proposes a kind of radio and television wireless network system of future generation, comprising:
Radio and television backbone network subsystem, for providing the channel condition information of program data and wireless terminal feedback to broadcast base station;
Broadcast base station, after encoding according to the channel condition information of wireless terminal feedback to received program data and modulating, sends radio program signal in broadcast or multicast mode to wireless terminal;
Wireless terminal, for receiving the radio program signal that broadcast base station sends, and gathers channel condition information, channel condition information is fed back to interacting base station by wireless signal mode;
Interacting base station, for by the reporting source of channel state information of wireless terminal feedback extremely described radio and television backbone network subsystem, sends to broadcast base station by radio and television backbone network subsystem by described channel condition information.
Described channel condition information comprises a kind of in following information or their combination: signal to noise ratio, the error rate, carrier/interface ratio, signal power, carrier wave/interference and noise ratio.
When described broadcast base station to be encoded according to channel condition information to received program data and modulates, if judge that channel conditions is lower than established standards according to channel condition information, then reduce the exponent number of modulation coding mode; Otherwise, improve the exponent number of modulation coding mode.
Described wireless terminal is mobile phone, or wireless data card, or personal digital assistant PDA, or television set.The network carrying out wireless interaction between described wireless terminal and described interacting base station is Broadband fixed wireless access or WLAN (wireless local area network) WLAN or World Interoperability for Microwave Access, WiMax WiMAX network or super wideband wireless UWB network.
The present invention also provides the method for adaptive channel adjustment in a kind of radio and television wireless network system of future generation, comprising:
The program data that broadcast base station provides radio and television backbone network subsystem sends radio program signal in broadcast or multicast mode to wireless terminal after encoding according to channel condition information and modulating;
The radio program signal that wireless terminal reception broadcast base station sends also gathers channel condition information, and channel condition information is fed back to interacting base station by wireless signal mode;
Described channel condition information to described radio and television backbone network subsystem, is sent to broadcast base station by radio and television backbone network subsystem by the reporting source of channel state information of wireless terminal feedback by interacting base station;
Broadcast base station is according to received channel condition information adjustment coding and modulation system, and the program data provided radio and television backbone network subsystem continues to send radio program signal to wireless terminal in broadcast or multicast mode after encoding and modulating.
Wherein, described channel condition information comprises a kind of in following information or their combination: signal to noise ratio, the error rate, carrier/interface ratio, signal power, carrier wave/interference and noise ratio.
When described broadcast base station adjustment coding and modulation system, if judge that channel conditions is lower than established standards according to channel condition information, then reduce the exponent number of modulation coding mode; Otherwise, improve the exponent number of modulation coding mode.
Described wireless terminal is mobile phone, or wireless data card, or personal digital assistant PDA, or television set.The network carrying out wireless interaction between described wireless terminal and described interacting base station is Broadband fixed wireless access or WLAN (wireless local area network) WLAN or World Interoperability for Microwave Access, WiMax WiMAX network or super wideband wireless UWB network.
Compared with prior art, the present invention is in original radio and television wireless network, the passback access technology of the backward channel utilizing radio and television wireless network of future generation to increase, the channel parameter of passback reflected radio tv wireless signal quality, according to the channel condition information of wireless terminal feedback, carry out adaptive adjustment to the modulation of wireless signal and coded system, it can realize with minimum cost to obtain maximum spectrum efficiency.Adopt adaptive coding and modulating AMC technology, provide Large Copacity business by wireless link and improve link utilization situation, the cost of radio frequency (RF) equipment can be reduced and be used for maintaining the operational overhead of these Large Copacity link bandwidths.Depend on link condition, adaptive coding and modulating AMC makes the modulation of a link and forward error error correction (FEC) dynamic change, but can not lose any data during the transmission, and keep maximum link spectral utilance in any given time under any link condition.
Accompanying drawing explanation
Fig. 1 is radio and television wireless network architecture schematic diagram of future generation of the present invention;
Fig. 2 is the flow chart of the method for self-adaptative adjustment of the present invention coding and modulation.
Embodiment
For making the object, technical solutions and advantages of the present invention clearly, below in conjunction with accompanying drawing, the present invention is described in further detail.
The method of radio and television wireless network system of future generation and channel self-adapting adjustment, interactive function can be realized, by the feedback information that wireless terminal sends to the backward channel of interacting base station, described feedback information is channel condition information, be issued to after broadcast base station through backbone network, broadcast base station carries out self-adaptative adjustment according to channel condition information to the coding of the wireless signal that radio and television are launched and debud mode, while meeting different channels error performance and requirement of real-time, improves overall performance.
As shown in Figure 1, the Organization Chart of radio and television wireless network system of future generation is shown.Described radio and television wireless network system of future generation comprises: radio and television backbone network subsystem (i.e. NGB-W backbone network), broadcast base station, wireless terminal, interacting base station, wherein:
Radio and television backbone network subsystem, for providing the channel condition information of program data and wireless terminal feedback to broadcast base station;
Broadcast base station, after encoding according to channel condition information to received program data and modulating, sends radio program signal with broadcast or multicast form to wireless terminal;
Wireless terminal, receives the radio program signal that broadcast base station sends, and gathers channel condition information, channel condition information is fed back to interacting base station by wireless signal mode;
Interacting base station, for by the reporting source of channel state information of wireless terminal feedback to described radio and television backbone network subsystem.
Described interacting base station and broadcast base station composition NGB-W Access Network, between wireless terminal and NGB-W backbone network, for access of eating dishes without rice or wine to wireless terminal.
Below the various piece shown in Fig. 1 is described in detail.
Wireless terminal, for receiving wireless digital broadcasting TV programme from broadcast base station, carrying out network insertion by interacting base station, carrying out interactively business, gathers channel condition information, by information feedback to interacting base station when receiving radio program signal; Described wireless terminal can be mobile phone, wireless data card or personal digital assistant PDA or television set etc.The air wireless interface standard of wireless terminal and broadcast base station can be China Mobile multimedia CMMB agreement, also can be Wireless IP network agreement.
Broadcast base station, for sending broadcast television signal in broadcast or multicast mode to wireless terminal, its transmission channel is unidirectional down channel, and wireless terminal is not to the return path of broadcast base station.Described broadcast base station can be the base station sending mobile digital multi-media broadcast signal based on CMMB agreement to wireless terminal.
Interacting base station, it is the base station based on wireless access wide band technology, itself and wireless terminal can be undertaken alternately by radio open standards such as broadband fixed radio access technology, WLAN technology, WiMAX technology, UWB technology, for user provides wireless network access services, simultaneously for whole radio and television wireless network provides exchange channels.Utilize and wireless interaction channel between wireless terminal, can from channel condition information of its feedback of wireless terminal reception, and can by reporting source of channel state information to backbone network.
Described broadcast base station and interacting base station can form NGB-W Access Network jointly.NGB-W Access Network, adopts the wireless access technology of various advanced person that user terminal can rapid and convenient be linked in NGB wireless system reliably.NGB-W Access Network is erected at the system entity implementing to transmit bearing capacity between wireless terminal and backbone network node, and its task is that user is linked into backbone network, provides user the connection of nearest service point.
NGB-W backbone network, backbone network is responsible for the most of function in radio data system, roughly can be divided into three levels, be respectively bearing bed, key-course and business support layer, multi-service management platform, operation platform, safety/management platform, access-in management platform etc. are provided, and possessing corresponding NGB system interface, realization is interconnected with NGB-C's.In the present invention, for realizing adaptive coding and modulation, there is provided except program data except to broadcast base station, the channel condition information of the wireless terminal feedback also reported by interacting base station is handed down to broadcast base station, by the channel condition information of broadcast base station according to wireless terminal feedback, carry out the adjustment of encoding Yu modulating, so circulate, reach the object of adaptive coding and modulation.
For radio network, backbone network also can provide cable access network, and cable access network is the radio and television wired network portion of future generation based on NGB-C, merges intercommunication with NGB-W in network layer.Catv terminal is by cable access network program receiving data, and described catv terminal is the cable reception device that user side uses, such as television set, cable modem etc.
Wherein, wireless terminal device receives the wireless signal of NGB-W Access Network transmission by air wireless interface, and this wireless signal is divided into two parts again, and a part is the broadcast singal based on multi-media TV broadcasting received by broadcast base station, is One-to-All Broadcast form; Another part be by interacting base station receive based on the wireless access network signal of Wireless IP network access, be two-way mutual wireless network, described Wireless IP network refer to by interacting base station eat dishes without rice or wine signal access wireless data service network.
As shown in Figure 2, the self-adaptive regulation method of channel of the present invention's radio and television wireless network of future generation, comprises the steps:
Step 201. generates radiated television program data by NGB-W backbone network, and described program data after certain coding with modulation, sends radio program signal to wireless terminal by broadcast base station, and the wireless terminal reception of user also processes this radio program signal;
The radio program signal that the wireless terminal reception of step 202. user is sent by broadcast base station, collect the associated channel parameters in radio program Signal reception process, such as signal to noise ratio, the error rate, carrier/interface ratio, signal power, carrier wave/channel condition information such as interference and noise ratio;
Wherein, wireless terminal can receive the free programme signal sent by broadcast base station, or charge programme signal.When receiving free program, if do not need mutual, directly receive the digital broadcast television programme signal that broadcast base station sends; When receiving charge program, first by interacting base station, through certain interaction mechanism, obtain program mandate, then receive radio program signal from broadcast base station.Wireless terminal reception also processes the radio program signal that broadcast base station sends, and through decoding demodulation, is reduced into video, audio frequency, the signals such as data, is presented to user by screen.
Step 203: wireless terminal is in the process of radio program signal receiving broadcast base station, the associated channel parameters (i.e. channel condition information) of the Received signal strength obtained will be detected, as signal to noise ratio, the error rate, carrier/interface ratio, signal power, carrier wave/channel condition information such as interference and noise ratio sends to interacting base station.
Step 204. interacting base station receives the channel condition information that wireless terminal sends, and channel condition information is sent to NGB-W backbone network by interacting base station;
The channel condition information of wireless terminal feedback is transmitted to broadcast base station by step 205.NGB-W backbone network.
After the associated channel condition information such as the channel parameter that all user feedbacks of step 206. broadcast base station integrated treatment come, adjust suitable modulation and coded system; When the modulation of the radiated television signal sent and coded system are adjusted, channel conditions can be judged, if channel conditions is bad according to the judgment condition of setting or decision threshold, then reduce the exponent number of modulation coding mode, increase reliability, reduce the error rate, reduce image definition; If channel conditions is relatively good, then improve the exponent number of modulation coding mode, increase channel width, improve image definition.
The radiated television program that step 207. generates for the NGB-W backbone network needing subsequently to send, after broadcast base station processes according to the coding after adjustment and modulation system, send radio program signal, wireless terminal reception also processes this radio program signal;
Step 208. wireless terminal receives the modulated radiated television signal of new modulation coding mode that broadcast base station sends, and namely after radio program signal, returns step 202, continues feeding back channel state information, repeats said process.
Adaptive channel encoding of the present invention is with modulation method of adjustment, for coding and modulator approach, can adopt and comprise advanced LDPC code, Turbo code, HARQ and adaptive coding modulation, and for business and channel, the compatibility of multi-rate coding structure supporting h-arq and adaptive coding is proposed.
The foregoing is only embodiments of the invention, be not limited to the present invention, for a person skilled in the art, the present invention can have various modifications and variations.Within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within right of the present invention.
Claims (10)
1. a radio and television wireless network system of future generation, is characterized in that, comprising:
Radio and television backbone network subsystem, for providing the channel condition information of program data and wireless terminal feedback to broadcast base station;
Broadcast base station, encodes and modulation system for the channel condition information adjustment according to received wireless terminal feedback; After received program data is encoded according to the coding after adjustment and modulation system and modulated, send radio program signal in broadcast or multicast mode to wireless terminal;
Wireless terminal, for receiving the radio program signal that broadcast base station sends, and gathers channel condition information, channel condition information is fed back to interacting base station by wireless signal mode;
Interacting base station, for by the reporting source of channel state information of wireless terminal feedback extremely described radio and television backbone network subsystem, sends to broadcast base station by radio and television backbone network subsystem by described channel condition information.
2. radio and television wireless network system of future generation as claimed in claim 1, is characterized in that,
Described channel condition information comprises a kind of in following information or their combination: signal to noise ratio, the error rate, carrier/interface ratio, signal power, carrier wave/interference and noise ratio.
3. radio and television wireless network system of future generation as claimed in claim 1, is characterized in that,
When described broadcast base station to be encoded according to channel condition information to received program data and modulates,
If judge that channel conditions is lower than established standards according to channel condition information, then reduce the exponent number of modulation coding mode; Otherwise, improve the exponent number of modulation coding mode.
4. radio and television wireless network system of future generation as claimed in claim 1, is characterized in that,
Described wireless terminal is mobile phone, or wireless data card, or personal digital assistant PDA, or television set.
5. radio and television wireless network system of future generation as claimed in claim 1, it is characterized in that, the network carrying out wireless interaction between described wireless terminal and described interacting base station is Broadband fixed wireless access or WLAN (wireless local area network) WLAN or World Interoperability for Microwave Access, WiMax WiMAX network or super wideband wireless UWB network.
6. a method for adaptive channel adjustment in radio and television wireless network system of future generation, is characterized in that, comprising:
The program data that broadcast base station provides radio and television backbone network subsystem sends radio program signal in broadcast or multicast mode to wireless terminal after encoding according to channel condition information and modulating;
The radio program signal that wireless terminal reception broadcast base station sends also gathers channel condition information, and channel condition information is fed back to interacting base station by wireless signal mode;
Described channel condition information to described radio and television backbone network subsystem, is sent to broadcast base station by radio and television backbone network subsystem by the reporting source of channel state information of wireless terminal feedback by interacting base station;
Broadcast base station is according to received channel condition information adjustment coding and modulation system, and the program data provided radio and television backbone network subsystem continues to send radio program signal to wireless terminal in broadcast or multicast mode after encoding and modulating.
7. method as claimed in claim 6, is characterized in that,
Described channel condition information comprises a kind of in following information or their combination: signal to noise ratio, the error rate, carrier/interface ratio, signal power, carrier wave/interference and noise ratio.
8. method as claimed in claim 6, is characterized in that,
When described broadcast base station adjustment coding and modulation system, if judge that channel conditions is lower than established standards according to channel condition information, then reduce the exponent number of modulation coding mode; Otherwise, improve the exponent number of modulation coding mode.
9. method as claimed in claim 6, is characterized in that,
Described wireless terminal is mobile phone, or wireless data card, or personal digital assistant PDA, or television set.
10. method as claimed in claim 6, it is characterized in that, the network carrying out wireless interaction between described wireless terminal and described interacting base station is Broadband fixed wireless access or WLAN (wireless local area network) WLAN or World Interoperability for Microwave Access, WiMax WiMAX network or super wideband wireless UWB network.
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| CN104219590A (en) * | 2013-06-05 | 2014-12-17 | 华为终端有限公司 | Method for switching coding modes, transmitting end and receiving end |
| CN103428222B (en) * | 2013-08-27 | 2016-07-06 | 上海数字电视国家工程研究中心有限公司 | Information distribution system and method |
| CN105472304A (en) * | 2015-11-24 | 2016-04-06 | 广东电网有限责任公司电力调度控制中心 | Power grid emergency communication video coding and decoding dynamic adaptation method and system thereof |
| CN106604082A (en) * | 2016-11-29 | 2017-04-26 | 贵州电网有限责任公司电力调度控制中心 | Downlink adaptive modulation coding method |
| CN109525303B (en) * | 2018-11-30 | 2021-04-02 | 四川安迪科技实业有限公司 | Adaptive modulation coding control method based on satellite communication |
| CN111147090B (en) * | 2020-01-15 | 2021-11-05 | 湖北凯乐量子通信光电科技有限公司 | Intelligent ad hoc network communication system based on software radio |
| CN111526389B (en) * | 2020-04-29 | 2022-02-15 | 深圳创维－Rgb电子有限公司 | Video playing method, television and storage medium for broadcast broadband hybrid application |
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