CN108471634A - A kind of video transmission method based on LTE network Yu Ad Hoc networks - Google Patents

A kind of video transmission method based on LTE network Yu Ad Hoc networks Download PDF

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Publication number
CN108471634A
CN108471634A CN201810448473.6A CN201810448473A CN108471634A CN 108471634 A CN108471634 A CN 108471634A CN 201810448473 A CN201810448473 A CN 201810448473A CN 108471634 A CN108471634 A CN 108471634A
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equipment
transmission
relay
lte network
rate
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CN201810448473.6A
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CN108471634B (en
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王匡
邹恺辉
陈惠芳
谢磊
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Zhejiang University ZJU
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Zhejiang University ZJU
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W40/00—Communication routing or communication path finding
    • H04W40/02—Communication route or path selection, e.g. power-based or shortest path routing
    • H04W40/12—Communication route or path selection, e.g. power-based or shortest path routing based on transmission quality or channel quality
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L45/00—Routing or path finding of packets in data switching networks
    • H04L45/12—Shortest path evaluation
    • H04L45/121—Shortest path evaluation by minimising delays
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L45/00—Routing or path finding of packets in data switching networks
    • H04L45/12—Shortest path evaluation
    • H04L45/124—Shortest path evaluation using a combination of metrics
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L45/00—Routing or path finding of packets in data switching networks
    • H04L45/12—Shortest path evaluation
    • H04L45/125—Shortest path evaluation based on throughput or bandwidth
    • 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
    • H04N21/21—Server components or server architectures
    • H04N21/218—Source of audio or video content, e.g. local disk arrays
    • H04N21/21805—Source of audio or video content, e.g. local disk arrays enabling multiple viewpoints, e.g. using a plurality of cameras
    • 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
    • H04N21/21—Server components or server architectures
    • H04N21/218—Source of audio or video content, e.g. local disk arrays
    • H04N21/2187—Live feed
    • 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]
    • H04N21/60—Network structure or processes for video distribution between server and client or between remote clients; Control signalling between clients, server and network components; Transmission of management data between server and client, e.g. sending from server to client commands for recording incoming content stream; Communication details between server and client 
    • H04N21/61—Network physical structure; Signal processing
    • H04N21/6156—Network physical structure; Signal processing specially adapted to the upstream path of the transmission network
    • H04N21/6181—Network physical structure; Signal processing specially adapted to the upstream path of the transmission network involving transmission via a mobile phone network
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W40/00—Communication routing or communication path finding
    • H04W40/02—Communication route or path selection, e.g. power-based or shortest path routing
    • H04W40/22—Communication route or path selection, e.g. power-based or shortest path routing using selective relaying for reaching a BTS [Base Transceiver Station] or an access point
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L45/00—Routing or path finding of packets in data switching networks
    • H04L45/12—Shortest path evaluation
    • H04L45/123—Evaluation of link metrics
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L45/00—Routing or path finding of packets in data switching networks
    • H04L45/70—Routing based on monitoring results

Abstract

The present invention relates to a kind of video transmission method based on LTE network Yu Ad Hoc networks.In the conventional method, when entering LTE network coverage hole or border district, video can not normal transmission.The method of the present invention carries out multiple devices cooperation transmission using Ad Hoc networks technology and multi-path transmission control protocol.The present invention initially sets up the system model of transmission of video, makes to form Ad Hoc networks by WiFi interfaces between more wireless video transmission equipment.When the LTE network bandwidth of certain wireless video transmission equipment cannot be satisfied transmission rate request, the equipment selects other LTE network links in Ad Hoc networks to have the equipment of remaining bandwidth as relaying by corresponding selection algorithm, and transmission of video is carried out using multichannel transmission control protocol.The method of the present invention is suitable for the cooperative large-scale live events scene of more wireless video devices, can provide more stable and reliable transmission of video.

Description

A kind of video transmission method based on LTE network Yu Ad Hoc networks
Technical field
The invention belongs to wireless communication technology fields, and in particular to a kind of video based on LTE network Yu Ad Hoc networks Transmission method.
Background technology
With the rapid development of multimedia technology and wireless communication technique, large-scale live events, such as marathon live streaming, voluntarily Vehicle match live streaming, two Conferences live streaming etc. emerge in large numbers in succession.It is these that multi-channel video picture, which is supplied to instructor in broadcasting center to carry out selection switching, The technical support condition of live events, more rich live content is provided to televiewer.Meanwhile current LTE network is comprehensive It disposes and is covered as these movable real-time video transmissions extensively and provide effective way.Wireless video transmission equipment based on 4G It can utilize multiple 4G network interface cards (supporting different systems), after the video/audio of acquisition carries out coding compression, be passed by LTE network It is defeated to be broadcast live at corresponding large-scale activity instructor in broadcasting center.
The characteristics of considering real-time video and audio transmission and its transferring content, large size live streaming plays transmission bandwidth, transmission of video Stability, end-to-end time delay etc. have very high requirement.And due to based on 4G wireless video transmission equipment utilization commercial network, Have the characteristics that mobility, it may be insufficient because of network coverage dead angle, edge zone, bandwidth with LTE network transmission real-time video Etc. reasons so that video pictures mosaic, interim card is occurred, or even interrupt the problems such as disappearing, and then it is high-quality to make instructor in broadcasting center that can not provide The live content of amount.Therefore, a kind of reliable transmission mode ensures the quality of multichannel real-time video transmission in large-scale live events It is very necessary and important.
Wireless multi-hop ad hoc (Ad Hoc) network technology and multi-path transmission control protocol (MultiPath TCP, MPTCP it) can effectively solve the above problems.As in the case of, in a large-scale live events, multiple wireless video transmissions are set It is standby to be operated in a region.Based on this premise, these wireless video transmission equipment rooms can also form Ad Hoc networks into Row communication.When certain wireless video transmission equipment enter LTE (Long Term Evolution, long term evolution) network coverage Blind area or marginal zone or LTE network bandwidth resources when cannot be satisfied the bandwidth demand of transmission of video, can utilize other have The transmission device of LTE network link residual available bandwidth as relaying, by Ad Hoc networks and MPTCP agreements will part or All videos data are sent to trunking, then are transmitted data at instructor in broadcasting center by the LTE network link of trunking Server, it is final to realize multi-path transmission video data, to provide more stable and reliable transmission of video.
Invention content
The technical program purpose is in view of the deficiencies of the prior art, to utilize Ad Hoc networking technologys and MPTCP agreements, solution The problem of single wireless video transmission equipment transmission real-time video is likely encountered in certainly large-scale live events, provides one kind and is based on The video transmission method of LTE network and Ad Hoc networks.
The method of the present invention comprises the concrete steps that：
Step 1. sets wireless video transmission cluster tool as D={ d1,...,di,...,dn, wherein diIt indicates to set for i-th It is standby；Each equipment is with rate R={ r1,...,ri,...,rnTransmission video, wherein riIndicate diRequired transmission rate, n are Wireless video transmission equipment sum；
diRequired transmission rate riIncluding two parts, a part is the rate of transmission device itself acquisition video data ri direct, another part is total rate r as relay forwarding miscellaneous equipment video datai sum-relay, i.e. ri=ri direct+ ri sum-relay；If equipment diNot transmitting video data, then ri=0；
Note uses equipment diCluster tool as relay forwarding data is Then diFor the total rate of relay forwardingWherein ri relay(dj) indicate diIt is used for as relaying Transmission comes from equipment djThe rate of data；When initialization,ri sum-relay=0；
D is setiA token variable sourceiIndicate equipment diIn whether using miscellaneous equipment to be used as trunk source After forwarding video data；If diIt is trunk source, sourcei=1；If diIt is not trunk source, sourcei=0, i.e.,When initialization, sourcei=0；
Meanwhile when have in Ad Hoc networks certain equipment as trunk source to miscellaneous equipment application relay forwarding ask When, miscellaneous equipment is unable to synchronization and initiates request to miscellaneous equipment application relay forwarding, and no it will cause conflicts；Therefore, Assuming that every equipment diA token variable waitiIn indicating whether to have in current Ad Hoc networks certain equipment to be used as It is asked after source forward direction miscellaneous equipment application relay forwarding：If it does, waiti=1；If it does not, waiti=0, i.e.,
When initialization, waiti= 0；
Work as diWhen needing relay forwarding, first check mark variable waiti；If waiti=1, then a period of time is needed to wait for, The broadcast notice miscellaneous equipment application relay forwarding process waiting that receives terminates, and wait is arrangediAfter=0, during which could apply After forwarding；If waiti=0, then it directly can apply for relay forwarding without waiting；
Between step 2. wireless video transmission equipment by WiFi interfaces form Ad Hoc networks, every equipment each by 4G network interface cards and commercial LTE network are established with server at instructor in broadcasting center and are connected；
Step 3. is for wireless video transmission equipment di, definitionFor diLTE network link available bandwidth, rtti For diPass through the two-way time of LTE network server at instructor in broadcasting center；Equipment diIt is surveyed using Bandwidth Measurement Method PathChirp Measure LTE network link available bandwidthTwo-way time rtt is obtained using the SRTT mechanism of Transmission Control Protocoli；
Step 4. is for wireless video transmission equipment di, judge its LTE network link available bandwidth and transmission needed for equipment The relationship of rate requirement：If LTE network link available bandwidth is more than or equal to transmission rate requirements needed for equipment, i.e.,Show diIt need not apply for relay forwarding, skip to step 5；If LTE network link available bandwidth is less than equipment Required transmission rate requirements, i.e.,Show diLTE wireless link bandwidths be not enough to send acquired video counts According to needing that other suitable equipment relay forwardings is selected to can be only achieved rate requirement, skip to step 6；
Step 5. is for wireless video transmission equipment di, further judge equipment diWhether as trunk source other set is used Standby forwarding data：If sourcei=1, execute step 5.1；If sourcei=0, execute step 5.2；
5.1. for wireless video transmission equipment di, in order to reduce in the complexity and Ad Hoc networks that transmission device controls The complexity of data flow, equipment diBy the path management module of MPTCP agreements, other trunkings will be sent data to It relays subflow to delete, only uses LTE network direct link transmitting video data, then set sourcei=0, and notify corresponding Trunking djUpdate its repeating device set
Corresponding trunking djUpdate repeating device setBy diFrom setMiddle deletion,Update the total rate of corresponding relay forwardingI.e. Step 7 is skipped to after the completion of update；
5.2. wireless video transmission equipment diTrunking is not used to forward data, does not do any transmission adjustment, skip to Step 7；
Step 6. wireless video transmission equipment diNeed the miscellaneous equipment application relay forwarding into Ad Hoc networks；
6.1. wireless video transmission equipment diJudge mark variable waitiState：If waiti=1, execute step 6.2；If waiti=0, execute step 6.3；
6.2.Ad there is miscellaneous equipment is in progress to be asked after forwarding in Hoc network, wireless video transmission equipment diIt waits for T1After time, step 6.1 is skipped to；
6.3. wireless video transmission equipment diIt transmits and asks to Ad Hoc network broadcast relays；
6.4. for miscellaneous equipment d in Ad Hoc networksj, it is every receive relay transmission request after, all by waitjSet 1； DefinitionFor equipment djLTE network link residual available bandwidth：
Wherein Δ bw is constant value, for retaining the certain residual available bandwidth of trunking to cope with the money of LTE network It fluctuates in source：IfEquipment djBy informationFeed back to relay request equipment di；IfThen It does not feed back；
Middle searching subset of devicesIt is set to meet subsetIn all set The sum of standby residual available bandwidth is more than equipment diRequired trunk bandwidth, i.e.,
IfMiddle presence meets conditionSubset of devices, then execute step Rapid 6.6；If there is no meet conditionSubset of devices, then follow the steps 6.11；
6.6. assume there are K to meet conditionSubset of devices, remember relay request Equipment diAll alternative trunking collection for meeting condition are combined into
Define alternative trunking setEquipment two-way time beIn equipment it is round-trip The maximum value of time, i.e.,Then from alternative trunking setMiddle choosing Preferentially first meetMinimum,Then meet minimum alternative of trunking number Trunking set is denoted as final selection result
6.7. relay request equipment diNotice setIn all devices, it is desirable that its prepare receive data carry out in After forwarding；
6.8. assume equipmentdjCorresponding relay forwarding preparation is carried out after notified, is fed back after the completion Give relay request equipment di；
6.9. relay request equipment diReceive selected trunking djFeedback information after, execute MPTCP agreements, with Selected trunking djEstablish the connection of MPTCP subflows；Then according to the pro rate of each trunking remaining bandwidth speed Rate sends video data；Specifically, if equipmentEquipment djThe rate of distribution, i.e., to relay request equipment di Relay forwarding rate beMeanwhile setting sourcei=1；
6.11. relay request equipment diMiscellaneous equipment relay forwarding processing procedure in broadcast notice network terminates, other Equipment djIndexed variable waitjIt is set to 0；So far, relay forwarding processing procedure is completed；
Step 7. wireless video transmission equipment diTransmission of video is carried out, the time T of setting is executed2Afterwards, return to step 3.
The application scenarios that the present invention is transmitted from large-scale live events multi-channel video, using Ad Hoc networking technologys with MPTCP agreements propose the more wireless video transmission equipment cooperation transmitting video datas based on Ad Hoc networks and LTE network Transmission method.Compared with other wireless video transmission equipment transmission methods based on 4G, advantages of the present invention is embodied in：
1, other wireless video transmission equipment transmission methods based on 4G place one's entire reliance upon wireless video transmission equipment itself Residing LTE network environment.The present invention forms Ad Hoc networks by wireless video transmission equipment room, when certain in Ad Hoc networks When wireless video transmission equipment LTE network situation is bad a bit, which can utilize other LTE network situations in Ad Hoc networks Good equipment carries out transmission of video as relaying, effectively solves the bad nothing of LTE network state residing for wireless video transmission equipment Method transmits the problem of video.
2, the present invention in for the selection algorithm of trunking considered round trip delay time and the management of MPTCP subflows at This so that the trunking set of selection has minimum round trip delay time, and the trunking number selected is minimum.Algorithm letter It is single effectively to there is lower algorithm complexity, while MPTCP subflow management costs be reduced, transmission adjustment is rapidly completed.
Description of the drawings
Fig. 1 is present system model schematic；
Fig. 2 is the system model schematic diagram of present example；
Fig. 3 is wireless video transmission equipment transmission control adjustment flow chart.
Specific implementation mode
A kind of video transmission method based on LTE network Yu Ad Hoc networks, system model is as shown in Figure 1, a certain There are n stylobates in the wireless video transmission equipment of 4G in a region.Wireless video transmission equipment passes through respective 4G network interface cards and eNB respectively Base station is linked into LTE network, and establishing connection with the server at instructor in broadcasting center carries out transmission of video.
N platforms wireless video transmission equipment forms Ad Hoc networks using WiFi in region.WiFi works in distributed mode, It i.e. can peer-to-peer communications between any two equipment of composition Ad Hoc networks.Currently, IEEE 802.11n in WLAN Theoretical transmission rate is up to 300Mbps, and transmission rate is up to 18.75MB/s in practical application, and commercial LTE network is practical at present Transmission rate is about 2MB/s in, it can be assumed that the available bandwidth of communication between devices passes through LTE network much larger than equipment The available bandwidth of server at instructor in broadcasting center.
Assuming that there are the region that certain LTE network signals are weak in wireless video transmission equipment region, as coverage hole, Marginal zone etc., i.e. black hatched example areas in Fig. 1.
N platform equipment mobile collection vision signal in region, using LTE network and Ad Hoc networks by real-time video transmission To the server at instructor in broadcasting center.
Below in conjunction with Fig. 2 examples, invention is further described in detail.
As shown in Fig. 2, there are 4 stylobates in the wireless video transmission equipment d of 4G in some region1,d2,d3,d4.Nothing Line video transmission equipment is linked by respective 4G network interface cards and the base stations eNB in LTE network respectively, with the server at instructor in broadcasting center It establishes connection and carries out transmission of video.
4 wireless video transmission equipment form Ad Hoc networks using WiFi in region.
There are the regions that certain LTE network signals are weak in wireless video transmission equipment region, such as coverage hole, edge Area etc., i.e. black hatched example areas in Fig. 2.
4 equipment mobile collection vision signals in region, using LTE network and Ad Hoc networks by real-time video transmission To the server at instructor in broadcasting center.
As shown in figure 3, being realized especially by following steps：
Step 1：Wireless video transmission cluster tool is D={ d1,d2,d3,d4}；Each equipment is needed with rate r1= 6Mbps, r2=4Mbps, r3=5Mbps, r4=3Mbps transmits video.
When initialization,
Step 2：Wireless video transmission equipment D={ d1,d2,d3,d4Between by WiFi interfaces form Ad Hoc networks, Every equipment is established with server at instructor in broadcasting center and is connected each by 4G network interface card and commercial LTE network.
Step 3：For wireless video transmission equipment d1,d2,d3,d4It is measured respectively using Bandwidth Measurement Method PathChirp LTE network link available bandwidth Two-way time rtt is obtained using the SRTT mechanism of Transmission Control Protocol1=30ms, rtt2=30ms, rtt3=60ms, rtt4=10ms.
Step 4：For wireless video transmission equipment d1,Skip to step 5.
Step 5：For wireless video transmission equipment d1, source1=0, execute step 5.2.
Step 5.2：Wireless video transmission equipment d1Trunking is not used to forward data, does not do any transmission adjustment, Skip to step 7, i.e. wireless video transmission equipment d1Transmission of video is carried out, after executing 30s, return to step 3 passes wireless video Transfer device d1, measurement updaue obtains LTE network link available bandwidthTwo-way time rtt1=30ms,Skip to step 6.
Step 6：Wireless video transmission equipment d1Need the miscellaneous equipment application relay forwarding into Ad Hoc networks.
Step 6.1：Wireless video transmission equipment d1Judge mark variable wait1State, wait1=0, execute step 6.3.
Step 6.2：There is miscellaneous equipment is in progress to be asked after forwarding in Ad Hoc networks, wireless video transmission equipment di Wait for T1After time, step 6.1 is skipped to；
Step 6.3：Wireless video transmission equipment d1It transmits and asks to Ad Hoc network broadcast relays.
Step 6.4：Miscellaneous equipment d in Ad Hoc networks2,d3,d4After receiving relay transmission request, respectively by wait2, wait3,wait4Set 1.
Take Δ bw=0.5Mbps, equipment d2,d3,d4Calculate LTE network link residual available bandwidthEquipment d2,d3,d4By information Feed back to relay request equipment d1。
Step 6.5：Relay request equipment d1Feedback device collection is received to be combined intoRecording equipment d2,d3,d4Feedback
Relay request equipment d1Trunk bandwidth needed for calculating
Relay request equipment d1 Middle searching subset of devicesIt is set to meet subsetIn the sum of the residual available bandwidth of all devices be more than equipment d1Required trunk bandwidth.It can obtain alternative Trunking set Execute step 6.6.
Step 6.6：It can be calculated's 's 's 'sPreferential selection trunking Equipment two-way time of set is minimum, the minimum alternative trunking set of trunking number as final selection result, Have
Step 6.7：Relay request equipment d1Notice setIn all devices, it is desirable that its prepare receive data into Row relay forwarding.
Step 6.8：d2Corresponding relay forwarding preparation is carried out after notified, feeds back to relay request equipment d after the completion1。
Step 6.9：Relay request equipment d1Receive selected trunking d2Feedback information after, execute MPTCP association View, with selected trunking d2Establish the connection of MPTCP subflows.Equipment d2The rate of distribution, i.e., to relay request equipment d1's Relay forwarding rate isMeanwhile equipment d1Set source1=1.
Step 6.10：Equipment d2By equipment d1Addition setIn,More new equipment d2Relaying turn Send out rate total
Step 6.11：Relay request equipment d1Miscellaneous equipment relay forwarding processing procedure in broadcast notice network terminates, Miscellaneous equipment d2,d3,d4Indexed variable wait2,wait3,wait4It is set to 0, so far, relay forwarding processing procedure is completed.
Step 7：Wireless video transmission equipment d1Transmission of video is carried out, after executing 30s, return to step 3.

Claims (4)

1. a kind of video transmission method based on LTE network Yu Ad Hoc networks, it is characterised in that this method comprises the concrete steps that：
Step 1. sets wireless video transmission cluster tool as D={ d1,...,di,...,dn, wherein diIndicate i-th of equipment；Often A equipment is with rate R={ r1,...,ri,...,rnTransmission video, wherein riIndicate diRequired transmission rate, n are wireless Video transmission equipment sum；
diRequired transmission rate riIncluding two parts, a part is the rate of transmission device itself acquisition video data ri direct, another part is total rate r as relay forwarding miscellaneous equipment video datai sum-relay, i.e. ri=ri direct+ ri sum-relay；If equipment diNot transmitting video data, then ri=0；
Note uses equipment diCluster tool as relay forwarding data is Then diWith In the total rate of relay forwardingWherein ri relay(dj) indicate diIt is used for transmission to come as relaying From equipment djThe rate of data；When initialization,ri sum-relay=0；
D is setiA token variable sourceiIndicate equipment diWhether use miscellaneous equipment conduct to relay as trunk source to turn Send out video data；If diIt is trunk source, sourcei=1；If diIt is not trunk source, sourcei=0, i.e.,When initialization, sourcei=0；
Assuming that every equipment diA token variable waitiFor indicating whether to have in current Ad Hoc networks certain equipment to make It is asked for trunk source forward direction miscellaneous equipment application relay forwarding：If it does, waiti=1；If it does not, waiti=0, i.e.,When initialization, waiti=0；
Work as diWhen needing relay forwarding, first check mark variable waiti；If waiti=1, then a period of time is needed to wait for, it is waiting It receives broadcast notice miscellaneous equipment application relay forwarding process to terminate, wait is setiAfter=0, which could apply for that relaying turns Hair；If waiti=0, then it directly can apply for relay forwarding without waiting；
Ad Hoc networks are formed by WiFi interfaces between step 2. wireless video transmission equipment, every equipment is each by 4G nets Card and commercial LTE network are established with server at instructor in broadcasting center and are connected；
Step 3. is for wireless video transmission equipment di, definitionFor diLTE network link available bandwidth, rttiFor di Pass through the two-way time of LTE network server at instructor in broadcasting center；Equipment diIt is measured using Bandwidth Measurement Method PathChirp LTE network link available bandwidthTwo-way time rtt is obtained using the SRTT mechanism of Transmission Control Protocoli；
Step 4. is for wireless video transmission equipment di, judge that its LTE network link available bandwidth is needed with transmission rate needed for equipment The relationship asked：If LTE network link available bandwidth is more than or equal to transmission rate requirements needed for equipment, i.e.,Table Bright diIt need not apply for relay forwarding, skip to step 5；If LTE network link available bandwidth, which is less than transmission rate needed for equipment, to be needed It asks, i.e.,Show diLTE wireless link bandwidths be not enough to send acquired video data, need to select other Suitable equipment relay forwarding can be only achieved rate requirement, skip to step 6；
Step 5. is for wireless video transmission equipment di, further judge equipment diWhether as trunk source use miscellaneous equipment turn Send out data：If sourcei=1, execute step 5.1；If sourcei=0, execute step 5.2；
5.1. equipment diBy the path management module of MPTCP agreements, the relaying subflow for sending data to other trunkings is deleted It removes, only uses LTE network direct link transmitting video data, then set sourcei=0, and notify corresponding trunking djMore Its new repeating device set
Corresponding trunking djUpdate repeating device setBy diFrom setMiddle deletion,Update the total rate of corresponding relay forwardingI.e.More Step 7 is skipped to after the completion of new；
5.2. wireless video transmission equipment diTrunking is not used to forward data, does not do any transmission adjustment, skip to step 7；
Step 6. wireless video transmission equipment diNeed the miscellaneous equipment application relay forwarding into Ad Hoc networks；
6.1. wireless video transmission equipment diJudge mark variable waitiState：If waiti=1, execute step 6.2；If waiti =0, execute step 6.3；
6.2.Ad there is miscellaneous equipment is in progress to be asked after forwarding in Hoc network, wireless video transmission equipment diWait for T1When Between after, skip to step 6.1；
6.3. wireless video transmission equipment diIt transmits and asks to Ad Hoc network broadcast relays；
6.4. for miscellaneous equipment d in Ad Hoc networksj, it is every receive relay transmission request after, all by waitjSet 1；DefinitionFor equipment djLTE network link residual available bandwidth, ifEquipment djBy informationInstead Relay request of feeding equipment di；IfIt does not feed back then；
6.5. relay request equipment d is definediFeedback device collection is received to be combined intoWork as diReceive equipment djFeedback information When, djIt is added to setIn, and recording equipment djFeedbackI.e.Calculate relay request equipment diRequired trunk bandwidth
Middle searching subset of devicesIt is set to meet subsetIn all devices it is surplus The sum of remaining available bandwidth is more than equipment diRequired trunk bandwidth, i.e.,
IfMiddle presence meets conditionSubset of devices, then follow the steps 6.6；If there is no meet conditionSubset of devices, then follow the steps 6.11；
6.6. assume there are K to meet conditionSubset of devices, note relay request equipment di All alternative trunking collection for meeting condition are combined into：
It determines final trunking set, is denoted as
6.7. relay request equipment diNotice setIn all devices, it is desirable that its prepare receive data carry out relaying turn Hair；
6.8. assume equipmentdjCorresponding relay forwarding preparation is carried out after notified, in feeding back to after the completion After request equipment di；
6.9. relay request equipment diReceive selected trunking djFeedback information after, execute MPTCP agreements, and it is selected In trunking djThe connection of MPTCP subflows is established, then according to the pro rate rate of each trunking remaining bandwidth, hair Send video data；
6.10. assuming equipmentThen equipment djBy equipment diAddition setIn,More new equipment djThe total rate of relay forwarding
6.11. relay request equipment diMiscellaneous equipment relay forwarding processing procedure in broadcast notice network terminates, miscellaneous equipment dj Indexed variable waitjIt is set to 0；So far, relay forwarding processing procedure is completed；
Step 7. wireless video transmission equipment diTransmission of video is carried out, the time T of setting is executed2Afterwards, return to step 3.
2. a kind of video transmission method based on LTE network Yu Ad Hoc networks as described in claim 1, it is characterised in that： Equipment d described in step 6.4jLTE network link residual available bandwidthFor：
Wherein Δ bw is constant value, for retaining the certain residual available bandwidth of trunking to cope with the resource wave of LTE network It is dynamic.
3. a kind of video transmission method based on LTE network Yu Ad Hoc networks as described in claim 1, which is characterized in that The method of the final trunking set of determination described in step 6.6 is：
Define alternative trunking setEquipment two-way time beIn equipment two-way time Maximum value, i.e.,Then from alternative trunking setMiddle selection is excellent First meetMinimum,Then meet the minimum alternative relaying of trunking number Cluster tool is denoted as final selection result
4. a kind of video transmission method based on LTE network Yu Ad Hoc networks as described in claim 1, which is characterized in that The pro rate rate according to each trunking remaining bandwidth described in step 6.9 sends video data, specifically：
If equipmentEquipment djThe rate of distribution, i.e., to relay request equipment diRelay forwarding rate beMeanwhile setting sourcei=1.
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