CN106791941A - Wireless WiFi multi-media broadcasting systems and method - Google Patents
Wireless WiFi multi-media broadcasting systems and method Download PDFInfo
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- CN106791941A CN106791941A CN201611238287.7A CN201611238287A CN106791941A CN 106791941 A CN106791941 A CN 106791941A CN 201611238287 A CN201611238287 A CN 201611238287A CN 106791941 A CN106791941 A CN 106791941A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/20—Servers specifically adapted for the distribution of content, e.g. VOD servers; Operations thereof
- H04N21/23—Processing of content or additional data; Elementary server operations; Server middleware
- H04N21/236—Assembling of a multiplex stream, e.g. transport stream, by combining a video stream with other content or additional data, e.g. inserting a URL [Uniform Resource Locator] into a video stream, multiplexing software data into a video stream; Remultiplexing of multiplex streams; Insertion of stuffing bits into the multiplex stream, e.g. to obtain a constant bit-rate; Assembling of a packetised elementary stream
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04H—BROADCAST COMMUNICATION
- H04H60/00—Arrangements for broadcast applications with a direct linking to broadcast information or broadcast space-time; Broadcast-related systems
- H04H60/76—Arrangements characterised by transmission systems other than for broadcast, e.g. the Internet
- H04H60/81—Arrangements characterised by transmission systems other than for broadcast, e.g. the Internet characterised by the transmission system itself
- H04H60/90—Wireless transmission systems
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/20—Servers specifically adapted for the distribution of content, e.g. VOD servers; Operations thereof
- H04N21/23—Processing of content or additional data; Elementary server operations; Server middleware
- H04N21/238—Interfacing the downstream path of the transmission network, e.g. adapting the transmission rate of a video stream to network bandwidth; Processing of multiplex streams
- H04N21/2381—Adapting the multiplex stream to a specific network, e.g. an Internet Protocol [IP] network
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/20—Servers specifically adapted for the distribution of content, e.g. VOD servers; Operations thereof
- H04N21/23—Processing of content or additional data; Elementary server operations; Server middleware
- H04N21/238—Interfacing the downstream path of the transmission network, e.g. adapting the transmission rate of a video stream to network bandwidth; Processing of multiplex streams
- H04N21/2389—Multiplex stream processing, e.g. multiplex stream encrypting
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/20—Servers specifically adapted for the distribution of content, e.g. VOD servers; Operations thereof
- H04N21/25—Management operations performed by the server for facilitating the content distribution or administrating data related to end-users or client devices, e.g. end-user or client device authentication, learning user preferences for recommending movies
- H04N21/262—Content or additional data distribution scheduling, e.g. sending additional data at off-peak times, updating software modules, calculating the carousel transmission frequency, delaying a video stream transmission, generating play-lists
- H04N21/26208—Content or additional data distribution scheduling, e.g. sending additional data at off-peak times, updating software modules, calculating the carousel transmission frequency, delaying a video stream transmission, generating play-lists the scheduling operation being performed under constraints
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
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- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Multimedia (AREA)
- Computer Networks & Wireless Communication (AREA)
- Databases & Information Systems (AREA)
- Two-Way Televisions, Distribution Of Moving Picture Or The Like (AREA)
- Mobile Radio Communication Systems (AREA)
Abstract
The present invention discloses a kind of wireless WiFi multi-media broadcasting systems and method, the covering system of limited range is set up using carrier class WiFi equipment, transmitting terminal is gathered by program source, program stream is multiplexed on demand, program stream synthesizes treatment again, the transmission of data flow and transmission, mobile client reception, self adaptation feedback, the part of video playback 7 are constituted.Multiplexing Polymera TS streams turn into the data flow of multiple program IP packet forms on demand, construction can simultaneously be received and process multichannel stream media network synthetic controller, such that it is able to send data flow using broadcast mode, realize that high-volume intelligent mobile phone terminal and Polymera are received and played simultaneously.IP broadcast technology of the present invention based on wireless WiFi of multimedia messages such as DTVs, can realize larger service scenarios (terminal, meeting-place, Waiting Lounge, in mobile compartment, residential block, tourist district etc.) under, reception while carrying out that the intelligent terminals such as more (＞ 32) mobile phone can be carried in the live IP broadcast of the multimedia messages such as DTV.
Description
Technical field
The present invention relates to multimedia information dissemination technical field, and in particular to one kind can apply to general mobile terminal and set
Standby wireless WiFi multi-media broadcasting systems and method.
Background technology
In radio and television and the fusion development for communicating are realized, how to solve the multimedia messages such as video it is live in terminal
Fusion is received turns into one of mark.The communications industry before a new generation such as 5G communication technology is not carried out, lead by 3G/4G mobile communication
Receive the constraint of technology realization mechanism (information exchange communication etc.), the net cast to big data quantity that the oversize, user of delay is presented in domain
Over-burden (campus network) etc. that drawback is difficult to be inherently eliminated for terminal consumption.And in the domestic and international correlation of broadcast television industry
In technical research, terrestrial DTV DVB-T2, ATSC-3.0, DTMB-A and 4G radio and television such as of new generation, by nerve of a covering
Network structure, terminal and service mode etc. influence, and only propose the multimedia messages big data broadcast downstream such as video, terminal request etc.
The up either shallow Combined design of small data；Directly conversion exists not to propose the multimedia broadcasting informations such as complete DTV
The Technology design of the intelligent terminal for reception such as mobile phone.The NGB-W schemes that even nearest broadcast television industry is proposed etc. are domestic related
In technical research, the system protocols of IEEE 802.11 are also only based in using wireless communication technology, WiFi technology is simply drawn
Enter, to realize covering the intelligent terminal for reception such as mobile phone.But do not break away from and limited by WiFi bandwidth and data circulation way, only
The intelligent terminal such as mobile phone can simultaneously access and be confined to family (zonule) access covering mode on a small quantity.And in larger service field
Scape (terminal, meeting-place, Waiting Lounge, in mobile compartment, residential block, tourist district etc.), in face of the intelligence end such as more (＞ 32) mobile phone
End needs to receive simultaneously when, existing wireless WiFi system number of access terminals (＜ 32) on the low side, rating simultaneously are overcome at least
Substantially and not fixed, program tricks is limited and higher, pervasive to terminal capabilities and homogeneity of product requirement for Quality Down, time delay
The problems such as property is relatively low is.And also need to intersect from the corresponding technology of Project Realization complexity, maturity and operation safety,
The aspects such as controllable reliability, manageability consider the acceptance in market.
The content of the invention
The technical problems to be solved by the invention are to be limited to communication bandwidth in existing multimedia information dissemination and cannot be same
When meet multi-user using and high-quality play problem, there is provided it is a kind of to can apply to the wireless of general mobile terminal equipment
WiFi multi-media broadcasting systems and method.
To solve the above problems, the present invention is achieved by the following technical solutions：
Wireless WiFi media broadcasting methods, comprise the following steps：
Step 1, transmitting terminal gather corresponding programme signal source；
Step 2, the programme signal source for collecting step 1 are multiplexed again according to system requirements, are formed Polymera and are passed
Defeated stream；
Step 3, step 2 need to be multiplexed after MPTS be distributed treatment, i.e.,
Step 3.1, program stream correction process is carried out to MPTS；
Step 3.2, data group mark treatment is carried out to the MPTS after error correction；
Step 3.3, according to propagation conditions and program stream speed, the length of Automatic adjusument data group, after mark
MPTS is grouped；
Step 3.4, formed data group will be grouped carry out a group interleaving treatment, allow annular array between data group, made
The data of whole program stream are well-regulated staggered；
Step 4, by the modulation of the Polymera IP traffic of step 3 after, broadcast mode hair is carried out by WiFi wireless launchers
Send；
Step 5, the receiving terminal with WIFI receive capabilities arbitrarily select to receive wherein a set of from Polymera IP traffic
Program；
Step 6, from all of receiving terminal one is selected as common terminal, the common terminal is by the communication feelings of oneself
Condition feeds back to transmitting terminal, and according to the communication quality for feeding back, whether determination data needs to retransmit transmitting terminal；If data need
Retransmit, then transmitting terminal carries out re-transmission data；If data need not be retransmitted, transmitting terminal then sends other data.
In above-mentioned steps 1, programme signal source from broadcast satellite, cable digital TV, terrestrial DTV, IPTV or
Local plug-in card is obtained.
In above-mentioned steps 3.1, program stream correction process is that Polymera is transmitted using the Turbo codings in 802.11 agreements
Stream carries out error correction.
Above-mentioned steps 3 are still further comprised, step 3.5, when there is the distributor of more than 2 in transmitting terminal, it is necessary to by this
The data of a little distributors carry out stacking treatment, to realize the distribution of more Polymera streams.
In above-mentioned steps 6, common terminal is that receiving terminal of packet loss highest in all of receiving terminal, that is, pass through
One threshold value of setting, when the packet loss of certain terminal is more than the threshold value, just selects it for common terminal, and notify other ends
End.
Realize the wireless WiFi multi-media broadcasting systems of the above method, including transmitting terminal and at least one receiving terminal.Send
End includes WiFi wireless launchers and at least one distributor；Each distributor includes programme signal source collecting unit, program stream
Multiplexing Unit and distribution of media processing unit on demand；Programme signal source collecting unit receives programme signal source, and programme signal source is adopted
Collect the input of the output end connection program stream Multiplexing Unit on demand of unit, the output end connection matchmaker of program stream Multiplexing Unit on demand
The input of body distributing processing unit, the output end of distribution of media processing unit connects the input of WiFi wireless launchers；Its
Middle distribution of media processing unit includes correction module, mark module, grouping module and interleaving block；The wherein input of correction module
End forms the input of distribution of media processing unit, the input of the output end linkage flag module of correction module, mark module
Output end connect the input of grouping module, the output end of grouping module connects the input of interleaving block, interleaving block
Output end forms the output end of distribution of media processing unit；Each receiving terminal carries WIFI receive capabilities, and by wireless
The data that channel receiving end/sending end sends.Configuration performance requirement to receiving terminal is relatively low, with obvious universal performance.
In such scheme, the receiving terminal is general mobile terminal equipment.
In such scheme, transmitting terminal sends data and flow to receiving terminal using broadcast mode.
In such scheme, programme signal source collecting unit is electric from broadcast satellite, cable digital TV, ground digital
Programme signal source is obtained depending on, IPTV or local plug-in cards.
In such scheme, transmitting terminal still further comprises stacking processor, and the input of the stacking processor divides with each
The output end connection of device is sent out, the output end for stacking processor is connected with the input of WiFi wireless launchers.
Compared with prior art, the present invention has following features：
Firstth, Polymera is watched online simultaneously to realize the intelligent terminal users such as the mobile phone under large scene.
As long as the second, possessing the intelligent terminals such as the mobile phone of WIFI receive capabilities can receive, that is, there is preferable end product
Universality.
3rd, the number of programs propagated is more, can adapt to the requirement of (8 sets of ＞) many to broadcast program quantity compared with large scene.
4th, an order of magnitude is at least improved than existing WiFi wireless Internets net cast number of users.And without building
Ground base broadband IP bearer network, substantially reduces cost.
5th, can realize that what the TS of selective carrying DTMB directly turned IP broadcast extends over service.
6th, simple and convenient is built, especially the large scene private network formula for adapting to specific (intensive user) region is covered, and with
The mobile media network equipment is linked, and realizes MESH seamless coverage networks.
7th, very strong business compatibility and autgmentability.In the case of especially to large scene multiservice requirement, media are fully demonstrated
The flexible function of information published method, is conducive to various operation modes such as advertisement business revenue.
8th, in addition to system constructing uses autonomous system core technology, related hardware product universality is very strong.
9th, it is high by terminal monitoring system operation safety coefficient, enter channel with reference to proprietary AP, set up it is efficient, controllable,
Reliable operational network, it is ensured that operational effect.
Brief description of the drawings
Fig. 1 is that multiple signals Polymera system of the invention realizes block diagram.
Fig. 2 is IP bags of the invention and data burst structure and its interleaving principle figure.
Specific embodiment
A kind of wireless WiFi media broadcasting methods, as shown in figure 1, specifically including following steps：
Step A, the collection in programme signal source.
Programme signal source is from broadcast satellite, cable digital TV, terrestrial DTV, IPTV (Interactive
Personality TV) or local plug-in card acquisition.
Programme signal source includes that multichannel programme televised live (IP/TS), matchmaker provide advertising message (TCP/IP), local information (TCP/
) and announce system of integrated information etc. IP.
The data stream format in programme signal source includes following three kinds of forms：1) the multiple single channel program IP that will be received are flowed through
Cross and be processed as unipath Polymera IP streams；2) MPTS (Multi-program transport stream, MPTS),
By demultiplexing obtain each SPTS (Single-program transport stream, SPTS, abbreviation TS) and
Transcoding flows for multi-path Polymera IP；3) Polymera TS multiplex streams, flow by being converted to unipath Polymera IP.
Obtained as MPTS is received by terrestrial DTV, its defined variable R is received in WiFi covering systems
Video data stream, i.e.,
Here N is the total way amount of data flow, siIt is the i-th circuit-switched data stream, κiIt is scale factor.Formula (1) refers to live broadcast system
In video data be made up of multichannel or Polymera stream.
Step B, program stream are multiplexed on demand.
In Video transmission system based on 802.11 agreements, its transmitting terminal reception processing be based on the timesharing of single channel program by
Need distribution.If the multiple program transmission requests of response, had both needed enough bandwidth resources, also increase distribution processors load, and
Big caching is needed to support.In order to solve these problems, after various program streams (MPTS or SPTS) acquired in step A, it is necessary to
(empty bag etc. is removed according to system requirements) again and be multiplexed with efficient MPTS, sequentially sent to form Polymera IP bags；
The message transmission rate and bandwidth availability ratio of WiFi system are improved, the computational load of distribution processors is reduced.
In detail, each circuit-switched data stream s of the MPTS for step A being gatherediIt is multiplexed with the shape of Polymera IP bags
Formula, can represent turns into
Here there are 7 identical or different programs TS bags IP bag the inside (a TS packet length is 188 bytes).Again
Person, that receive is MPTS, and it can be regarded as being made up of TS bags one by one per TS streams all the way.Have different per TS streams all the way
PID (Packet Identifier, PID) labelled notation TS bags, the TS pack arrangement schematic diagrames in such as Fig. 2.One IP bag is sound all the way
The all or part of information of a frame in the middle of video frequency program.Especially, the programme content of IP bags here is according to communication conditions
It is determined that, so the bandwidth availability ratio of system can be improved according to the rational distribution bandwidth space of the quality of communication environment.
The distribution processor of step C, program stream.
The distribution processor of program stream is media synthesis treatment, will step B multiplexings obtain containing the IP numbers of multiple programs
Program stream distribution processor is carried out according to stream.The distribution processor of program stream is including program stream correction process, the treatment of data group mark, to institute
Having program stream carries out adaptive grouping, self adaptation group interleaving treatment is carried out to data group and multiple distributor stacking treatment.
(1) program stream correction process.
The program stream correction process to IP packet forms mainly uses the Turbo code corrections in 802.11 agreements.
(2) data group mark treatment.
According to the Polymera IP streams that step A is obtained, client packet drop, data recombination are judged for convenience, in media
Receiving terminal uses the small cachings of 2Mbps in synthesis treatment.Then, user datagram UDP (User datagram protocol,
UDP an efficient MPTS (de-redundancy) is packaged on).And this MPTS has the data segment number of oneself, with this MSTP to each
Program IP bags are from 0 to 65535 numbering cycles.Because there is the port numbers of oneself per programs TS streams, and per the TS in programs TS streams
Bag also has independent numbering.Here mark treatment is in order to distinguish the TS bags of every programs TS streams, conveniently subsequently to data flow
Carry out adaptive grouping treatment.
(3) adaptive grouping is carried out to all data flows, as shown in Figure 2.During video data transmission of the invention,
The stream rate of each program is real-time change, and the code stream of same program is also change in speed not in the same time.Cause
This, in order to be determined to send the big of data according to different program stream rate adaptations in data flow procedure is sent
It is small, so as to improve channel utilization and data transmission efficiency, it is necessary to video data stream packet transaction, the wherein length of data group
(that is, the IP bags quantity for including) is according to propagation conditions adaptive change.But in the case where have selected a kind of length, each
The Polymera IP bags quantity of group keeps identical.And for the Polymera IP bag quantity of each program stream be with code stream size and
Communication conditions adaptive change.Just as there are 7 TS bags of same program IP bag the inside outlined above (for example, a TS
Packet length is 188 bytes).One IP bag is all or part of information of a frame all the way in the middle of audio/video program.
Its Mathematical Modeling is to define video data stream to be divided into T data group, i.e.,
V={ G0,G1,…,GT-1} (3)
Here V represents video data, GtIt is t-th data group.Here the quantity T being grouped is by the actual feelings of video data
Condition is determined.Each group of length is automatically selected according to annoyance level and error situation (packet drop).Initial group length
It is manually to set, typically the 10 of number of programs times.
Here one group of data can include 20 to 120 IP bags.And, it is serial arrangement, data group between each group
Length according to stream rate size adaptation change.Similarly, each group of packet contains NtIndividual Polymera IP bags, i.e.,
Gt={ IP1,IP2,…,IPNt} (4)
Here 20≤Nt≤120.But after this kind of data group length is determined, per number under current communication conditions
Keep identical according to the length of group.And 7 TS bags are contained in each Polymera IP bags, formula (2) can be simplified to as following
Formula
IPn={ TS1,TS2,…,TS7} (5)
(4) self adaptation group interleaving treatment is carried out to data group.
Invention interweaves there is provided a kind of self adaptation group transmitted in the communication of wireless WiFi covering systems for video data
Method, to overcome the random error and burst error during video data transmission, prevent program stream data frame integrally lose and
Error of transmission.Here intertexture thinking is that the data of complete programs stream are well-regulated staggered.Mainly between data group
It is annular array to be interleaved between treatment, i.e. data group, is integrally lost and is transmitted with the program data for preventing Polymera IP bags
Mistake.Video data is transmitted in a large amount of same program packet drop and raising wireless communication system that can be caused with antiburst error
Quality, it is ensured that video playback it is smooth and clear.
Step D, multiple distributor stacking treatment.
One distributor can at least process 8 (>=) road program streams, and in actual application, often exist more
The demand of road program stream.In this case multiple distributor stackings can be processed, so as to realize more multi-channel program streams
Distribution.Can be expressed as with Mathematical Modeling
Additionally, data-reusing Polymera IP stream format, in such as Fig. 2, defined embedded system structure is small caching
2Mbps.This can reduce the loss of hardware resource while data quick storage is ensured.
The transmission and transmission of step E, data flow.
By the multi program multiplex IP traffic obtained in step D, the data flow after interweaving in such as Fig. 2, one by one more piece
The transmission of mesh IP bags.Wherein, IP traffic is encapsulated according to 802.11 data frame formats.The radio communication of 802.11 protocol families is led to
It is often to use half-duplex operation mode.And this semiduplex communication mode, the increase with number of access terminals occurs letter
Road is crowded and blocks.And in large scene WiFi is live, there is the situation that great amount of terminals is accessed simultaneously.According to the step D numbers
The data IP obtained according to distribution processor flows, and is sent using broadcast mode.And the advantage that this broadcast mode propagates IP traffic is
Receiving terminal is not needed to feed back to transmitting terminal by same channel.So greatly reduce propagate in channel it is crowded and block
Phenomenon.The terminal quantity of wireless WiFi system reception simultaneously can be increased substantially (in theory up to 105Magnanimity).
Packaged video data group is sent in broadcast address and port with broadcast mode.Wherein, Polymera IP bags are wide
Broadcast mode (i.e. either simplex) sends, and a Polymera IP bag maximum is 1472 bytes.When multiple programs stream, often set is saved
Mesh has the port numbers of oneself, i.e., distinguished with port numbers per programs.Here the port numbers of a distributor are 8001 to 800N.
One distributor can realize that N programs TS streams send simultaneously.
In order to improve broadcast transmission performance, using carrier class WiFi equipment, (that is, the WiFi for meeting the standard of the communications industry sets
It is standby), such as 802.11g, n serial protocols send data.This can ensure general end in video living transmission system effective coverage range
Reliable reception is flowed at end to video Polymera IP.
In 802.11 protocol suites, broadcast frame is typically for transfer management and control information, is NACK mechanism.Therefore it is sharp
It is unreliable transmission to transmit data with broadcast frame, is generally not used for data transfer.Furthermore, the speed of broadcast transmission of data is low, and one
As WiFi equipment in broadcast frame velocity maximum acquiescence 1Mbps.In order to improve its speed, can be to AP (Access
Point, AP) broadcast rate configuration is carried out, to improve transmission rate, the AP of carrier class can be configured and be brought up to 36Mbps.So as to
Realize improving the transmission rate and reliability of IP broadcast system.
Step F, the mobile client are received.
Because MPTS circulations are changed into Polymera IP streams in step D, as long as the intelligent terminal such as mobile phone possesses WIFI and connects
Receive function, so that it may which arbitrarily selection receives a set of video flowing；The hardware resources of intelligent terminal such as even different mobile phones and match somebody with somebody
Put difference larger, it is also possible to reliable reception.
In detail, numerous terminals are received with the data of broadcast transmission, can be shown as with following formula sublist
Rk(t)=S (t)+σ (t), k=1,2 ..., K (7)
Here RkT () is k-th terminal received signals, S (t) is the data that broadcast mode sends, and σ (t) is noise, and K is
Client terminal quantity.
Step G, self adaptation feedback.
For 802.11, it is generally the case that broadcast frame transmission is not feed back.In order to timely be fed back to transmitting terminal
The signal intelligence of receiving terminal, proposes a kind of feedback method that video data stream is transmitted for broadcast mode.At numerous reception ends
End, according to actual signal intelligence, the current interference of selection is most strong, and at most, the worst terminal of quality is used as representational for packet loss
Common terminal.As long as ensure that the communication quality of the most severe terminal of environment is good, then ensured that every other
The communication requirement of terminal.
In detail, client is being received, selection one can reflect the public visitor of the communication quality of all terminal users
Family end.First, the communication quality of each client is defined, can be expressed as
Qk=f (Rk(t)), k=1,2 ..., N (8)
Here QkIt is to represent k-th communication quality of client, is typically broadcast by validity, reliability, packet loss, video
Put quality composition.In detail, can be described with following formula
Here μiIt is the validity of client communication,It is reliability, ηiIt is packet loss, IiIt is that the quality of video playback is commented
Value, such as PSNR (Peak signal to noise ratio, PSNR).
Based on formula (9), a common terminal P is selected, and feed back the signal intelligence of the terminal, it is not necessary to each terminal
Feed back the signal intelligence of oneself.Here common terminal P is to choose minimum value from all of communication evaluation of estimate, i.e.,
P=min ({ Qk, k=1,2 ..., K }) (10)
Conveniently, a quality threshold can be set, which terminal first reaches the threshold value as common terminal,
And notify that other-end need not retransmit feedback.Based on the common terminal P of formula (10), the signal intelligence of the terminal is fed back to
Transmitting terminal.Transmitting terminal carries out whether determination data retransmits according to the communication quality of the common terminal user P for feeding back.If
Data need to retransmit, then re-transmission data are carried out, if need not retransmit so transmitting terminal then sends other data frame.It is complete
Into the feedback based on broadcast transmission data, into feedback inspection next time.
Step H, video playback.
For arbitrary mobile device, as long as being mounted with that the APP matched with system just can be the equipment access system
Video flowing and broadcasting are received, the receiving terminal of system has obvious universal performance.Wherein it is possible to according to the multiple sections of port numbers switching
Mesh.
Realize the wireless WiFi multi-media broadcasting systems of the above method, including transmitting terminal and at least one receiving terminal.It is described
Transmitting terminal includes WiFi wireless launchers, stacking processor and at least one distributor.Each distributor includes programme signal source
Collecting unit, program stream Multiplexing Unit and distribution of media processing unit on demand.Programme signal source forms the input of distributor, adopts
Collection unit receives programme signal source.In the present invention, programme signal source collecting unit is electric from broadcast satellite, cabled digital
Programme signal source is obtained depending on, terrestrial DTV, IPTV or local plug-in card.The output end connection section of programme signal source collecting unit
The input of mesh stream Multiplexing Unit on demand.Program stream on demand Multiplexing Unit output end connect distribution of media processing unit input
End.The output end of distribution of media processing unit forms the output end of distributor.Stack the input and each distributor of processor
Output end connection, stack processor output end be connected with the input of WiFi wireless launchers.Transmitting terminal uses broadcaster
Formula sends data and flow to receiving terminal.The receiving terminal is general mobile terminal equipment, and each receiving terminal carries WIFI
Receive capabilities, and the data sent by wireless channel receiving end/sending end.
Above-mentioned distribution of media processing unit includes correction module, mark module, grouping module and interleaving block.Wherein error correction
The input of module forms the input of distribution of media processing unit, the input of the output end linkage flag module of correction module
End, the output end of mark module connects the input of grouping module, and the output end of grouping module connects the input of interleaving block,
The output end of interleaving block forms the output end of distribution of media processing unit.
On the basis of high efficiency encoder (H.264 or AVS or HEVC or AVS2 etc.), using in ARM embedded systems
Programming realization.System is main by least one Dispatching Unit, WIFI wireless transmitting units, intelligent terminal and self adaptation feedback unit
Composition.Each Dispatching Unit includes the distribution processor of programme signal source acquisition module, program stream Multiplexing module and program stream on demand
Module.The input of the output end connection program stream Multiplexing module on demand of programme signal source acquisition module, program stream is multiplexed on demand
The output end of module connects the distribution processor module of program stream, and the output end connection WIFI of the distribution processor module of program stream is wireless
Transmitter unit.The outside broadcasting multimedia data of WIFI wireless transmitting units.Intelligent terminal for reception WIFI wireless transmitting units send
Multi-medium data.Intelligent terminal connects the distribution processor module of the program stream of Dispatching Unit by self adaptation feedback unit.
Programme signal source acquisition module is gathered from broadcast satellite, cable digital TV, terrestrial DTV, IPTV
Programme signal source is obtained in (Interactive Personality TV, IPTV) or local plug-in card.It is multiplexed on demand in program stream
The TS streams of multi-channel program are converted into IP according to speed size in module to flow, are grouped in the distribution processor module of program stream
And interleaving treatment, TS is then flowed the small cachings of 2M, finally using the transmission data of broadcast mode IP bags one by one, then in intelligence
Terminal receives video flowing and broadcasting.The distribution processor module of program stream receives intelligent terminal and feeds back by self adaptation feedback unit,
And video playing quality is detected, if play quality meets this time send data success, if play quality is unsatisfactory for, then again
It is secondary to repeat conversion IP streams and send again to be required until video playing quality meets user.
Product experiment is put into practice below by a system to illustrate effect of the present invention：
In this experiment, we use 6 programs sources.For the video playback performance of detecting system, a hand is used
Machine receives video stream data stream, it has been found that 6 programs can be played clearly with smooth reception.Can from our video playbacks
To see, relative to transmitting terminal, the delay of about 5 seconds is occurred in that in receiving terminal.And the unobstructed general direct-view of broadcasting of any program
Can ensure smooth in the range of 100 meters of distance and clearly play.Here coverage is determined by the signal intensity of WiFi
It is fixed.Additionally, each programs, we have received 1 minute video of duration and carry out counting packet loss and average bit rate.In mobile phone terminal
The packet loss for detecting reaches very low level, for example, the packet loss of the first programs can reach 2.463661e10-3, the 3rd
The packet loss of programs is 2.8731505e10-4.And the admissible maximum packet loss of video flowing is 2%, average bit rate unit is
KB(Byte).Finally, 6 programs are also received simultaneously using the mobile phone of 9 different configurations and brand, it has been found that each mobile phone is all
The broadcasting of video and smoothness can clearly be received.From above experimental result, our SD video living transmission system can be simultaneously
Transmission multiple programs, and cause to be received in common cell-phone customer terminal and clearly played.Finally, the system can be accommodated greatly
Amount cell-phone customer terminal is accessed simultaneously, is downloaded, is shared and play various types of videos.
The present invention sets up the covering system of limited range using carrier class WiFi equipment, is pressed by program source collection, program stream
Treatment, the transmission of data flow and transmission, mobile client are received, self adaptation is fed back, video playback to need multiplexing, program stream to synthesize again
7 parts constitute.Multiplexing Polymera TS streams turn into the data flow of multiple program IP packet forms on demand, and construction can simultaneously be received and located
Reason multichannel stream media network synthetic controller, such that it is able to send data flow using broadcast mode, realizes high-volume smart mobile phone
Terminal and Polymera are received and played simultaneously.IP broadcast skill of the present invention based on wireless WiFi of multimedia messages such as DTVs
Art, can realize larger service scenarios (terminal, meeting-place, Waiting Lounge, in mobile compartment, residential block, tourist district etc.) under, enter
Received while the intelligent terminals such as more (＞ 32) mobile phone can be carried in the live IP broadcast of the multimedia messages such as row DTV.
Above-mentioned various case study on implementation, only further describe to the purpose of the present invention, technical scheme and beneficial effect
Specific case；The present invention is not limited to this.All any modifications made within the scope of disclosure of the invention, equally replace
Change, improve, be all contained within protection scope of the present invention.
Claims (10)
1. wireless WiFi media broadcasting methods, it is characterized in that, comprise the following steps：
Step 1, transmitting terminal gather corresponding programme signal source；
Step 2, the programme signal source for collecting step 1 are multiplexed again according to system requirements, form MPTS；
Step 3, step 2 need to be multiplexed after MPTS be distributed treatment, i.e.,
Step 3.1, program stream correction process is carried out to MPTS；
Step 3.2, data group mark treatment is carried out to the MPTS after error correction；
Step 3.3, according to propagation conditions and program stream speed, the length of Automatic adjusument data group, by the more piece after mark
Program transport stream is grouped；
Step 3.4, formed data group will be grouped carry out a group interleaving treatment, allow annular array between data group, make complete section
The data of mesh stream are well-regulated staggered；
Step 4, by the modulation of the Polymera IP traffic of step 3 after, broadcast mode transmission is carried out by WiFi wireless launchers；
Step 5, the receiving terminal with WIFI receive capabilities arbitrarily select to receive a wherein programs from Polymera IP traffic；
Step 6, from all of receiving terminal select one as common terminal, the common terminal is anti-by the signal intelligence of oneself
Transmitting terminal is fed back to, according to the communication quality for feeding back, whether determination data needs to retransmit transmitting terminal；If data need weight
Pass, then transmitting terminal carries out re-transmission data；If data need not be retransmitted, transmitting terminal then sends other data.
2. wireless WiFi media broadcasting methods according to claim 1, it is characterized in that, in step 1, programme signal source from
Broadcast satellite, cable digital TV, terrestrial DTV, IPTV or local plug-in cards are obtained.
3. wireless WiFi media broadcasting methods according to claim 1, it is characterized in that, in step 3.1, program stream error correction
Treatment is to carry out error correction to MPTS using the Turbo codings in 802.11 agreements.
4. wireless WiFi media broadcasting methods according to claim 1, it is characterized in that, step 3 is still further comprised, step
Rapid 3.5, when distributor of the transmitting terminal in the presence of more than 2, it is necessary to the data of these distributors are carried out into stacking treatment, to realize
The distribution of more Polymera streams.
5. wireless WiFi media broadcasting methods according to claim 1, it is characterized in that, in step 6, common terminal is institute
That receiving terminal of packet loss highest in some receiving terminals, i.e., by setting a threshold value, when the packet loss of certain terminal
Rate is more than the threshold value, just selects it for common terminal, and notify other-end.
6. the wireless WiFi multi-media broadcasting systems based on claim 1 methods described, including transmitting terminal and at least one are received eventually
End, it is characterized in that：
Transmitting terminal includes WiFi wireless launchers and at least one distributor；It is single that each distributor includes that programme signal source gathers
Unit, program stream Multiplexing Unit and distribution of media processing unit on demand；Programme signal source collecting unit receives programme signal source, program
The input of the output end connection program stream Multiplexing Unit on demand of signal source collecting unit, the output of program stream Multiplexing Unit on demand
The input of end connection distribution of media processing unit, the output end of distribution of media processing unit connects the defeated of WiFi wireless launchers
Enter end；
Wherein distribution of media processing unit includes correction module, mark module, grouping module and interleaving block；Wherein correction module
Input formed distribution of media processing unit input, the input of the output end linkage flag module of correction module, mark
Remember that the output end of module connects the input of grouping module, the output end of grouping module connects the input of interleaving block, interweaves
The output end of module forms the output end of distribution of media processing unit；
Each receiving terminal carries WIFI receive capabilities, and the data sent by wireless channel receiving end/sending end.
7. wireless WiFi multi-media broadcasting systems according to claim 6, it is characterized in that, the receiving terminal is general shifting
Dynamic terminal device.
8. wireless WiFi multi-media broadcasting systems according to claim 6, it is characterized in that, transmitting terminal is sent out using broadcast mode
Data are sent to flow to receiving terminal.
9. wireless WiFi multi-media broadcasting systems according to claim 6, it is characterized in that, programme signal source collecting unit from
Broadcast satellite, cable digital TV, terrestrial DTV, IPTV or local plug-in cards obtain programme signal source.
10. wireless WiFi multi-media broadcasting systems according to claim 6, it is characterized in that, transmitting terminal is still further comprised
Stacking processor, the input of the stacking processor be connected with the output end of each distributor, the output end of stacking processor and
The input connection of WiFi wireless launchers.
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