CN103079234A - Multi-network self-adaption toggle selection transmission method and wireless video transmission system - Google Patents
Multi-network self-adaption toggle selection transmission method and wireless video transmission system Download PDFInfo
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Abstract
The invention relates to a multi-network self-adaption toggle selection transmission method and a wireless video transmission system. The method comprises the steps: when a link can not be established through static configuration, conducting selection, registration and network access to the link by adopting a transmission delay-based multi-network self-adaption access strategy; and in the process of data transmission, detecting the quality condition of other links by adopting the dynamic toggle strategy of a link quality-based wireless heterogeneous network so as to decide whether dynamic toggle transmission is conducted or not. The system comprises a transmission terminal and a monitoring center, the transmission terminal is connected with a 3G module, a Wi-Fi module and an Ethernet module, the transmission terminal is connected into an Internet through the 3G module or the Wi-Fi module, or into a campus network through the Wi-Fi module, so as to transmit the video data to the monitoring center. The method and the system are adopted for wireless video transmission, the transmission link can be favorably established quickly, and the transmission quality and the transmission speed of the video data are improved.
Description
Technical field
The present invention relates to a kind of many network self-adaptings selects switched transmission method and adopts these many network self-adaptings to select the wireless video transmission system of switched transmission method.
Background technology
In point-to-point wireless video transmission system, the video transmission terminal of front end is responsible for the video flowing that collects after overcompression, and the playback of decoding of the local monitor center of being sent to the upper appointment of Internet by wireless communication module is to reach the purpose of monitoring.And in the process of the transmission that realizes video data, often occur setting up transmission link, the variety of problems such as link transmission quality is poor, and transmission speed is low greatly reduces the effect of wireless video transmission.
Summary of the invention
The object of the invention is to overcome the deficiencies in the prior art, provide a kind of many network self-adaptings to select switched transmission method and wireless video transmission system, adopt the method and system to carry out wireless video transmission and be conducive to the Rapid Establishment transmission link, improve transmission quality and the transmission speed of video data.
For achieving the above object, technical scheme of the present invention is: a kind of many network self-adaptings are selected switched transmission method, after transmission terminal starts, when described transmission terminal can't be set up link by static configuration and Surveillance center, adopt and carry out selection, registration and the network insertion of link based on many network self-adaptings access strategy of transmission delay; When described transmission terminal at the link of registration when carrying out transfer of data, adopt based on the dynamic switchover policy of the Wireless Heterogeneous Networks of link-quality the quality condition of other link is detected to determine whether dynamically switch transmission in real time;
Described many network self-adaptings access strategy based on transmission delay may further comprise the steps:
(1) link preliminary election, be that described transmission terminal carries out destination identification by the IP address sort: if the IP address of Surveillance center is private ip, judge that then described Surveillance center is positioned at Campus Network, preliminary election ethernet module or Wi-Fi module are set up initial link circuit, if the IP address of Surveillance center is public network IP, then preliminary election 3G module or Wi-Fi module are set up initial link circuit;
(2) link test: when having many preliminary election links, namely exist Ethernet to connect and a plurality of Wi-Fi Hotspot for private ip, or exist for publicly-owned IP in the situation of 3G signal and public network Wi-Fi Hotspot, then pre-each bar preliminary election link of access carries out that destination can reach test and transmission delay adds up to select optimum link;
(3) link establishment: select optimum link, the initialization transformation parameter also carries out transfer of data; The access way of link is: for private ip, ethernet module connected with network cable or Wi-Fi module connect focus automatic acquisition IP address; For publicly-owned IP, the 3G module is obtained public network IP by ppp agreement or Wi-Fi module by the ppoe agreement;
The dynamic switchover policy of described Wireless Heterogeneous Networks based on link-quality carries out as follows: when transmission terminal monitors that Wi-Fi Hotspot exists and during signal stabilization, then dynamically switches in the Wi-Fi network and transmit, discharge simultaneously the 3G link; When the Wi-Fi Hotspot signal strength signal intensity weakened gradually, described transmission terminal switched to again on the 3G link and transmits.
The method comprises that also the adaptively selected transmission policy of the multichannel that adopts wireless homogeneous network carries out many 3G module concurrent transmission, to improve network bandwidth utilization factor, the adaptively selected transmission policy of the multichannel of described wireless homogeneous network comprises be used to the adaptive flow control strategy of the group-based Loss Rate of avoiding network congestion and many 3G channel self-adapting selects transmission policy;
The adaptive flow control strategy of described group-based Loss Rate is dynamically adjusted transmission rate according to the fixing packet loss rate that sends in the interval; Definite method of packet loss rate is: Surveillance center is after receiving first packet, the blocked byte number that beginning timing statistical interval was received in the time, then mail to transmission terminal by feedback packet, comprise the actual blocked byte of receiving of Surveillance center in the described feedback packet and count S
RecvAfter described transmission terminal is received feedback packet, count S in conjunction with the actual blocked byte that sends in blanking time
Send, calculate the packet loss rate P that this records by following formula (1)
Curlost, with this criterion as packet loss rate:
Wherein, P
LastlostBe the packet loss rate that recorded last time, P
LostFor passing through S
RecvAnd S
SendThe packet loss rate that calculates;
Set the thresholding P of packet loss rate
Low, P
Up, wherein, P
Up=2P
LowWhen packet loss rate less than P
LowThe time, the expression current network is in light condition, improves transmission rate this moment or improve transmission rate to increase step-length; When packet loss rate is positioned at [P
Low, P
Up] between the time, the expression current network enters the Congestion Avoidance state, reduces transmission rate this moment and increases step-length or reduce transmission rate; When packet loss rate surpasses P
UpThe time, the expression current network is in congestion state, reduces transmission rate this moment;
Described many 3G channel self-adapting selection transmission policy carries out as follows: channel wheel of transmission terminal maintenance turns formation, when having data to send, turns the channel transmission of choosing the free time the formation according to the FIFO mode from described channel wheel; When receiving the feedback packet of Surveillance center, upgrade described channel wheel according to the packet loss rate that records and turn formation; If the packet loss rate of several channels has surpassed congestion threshold, then allow a highest channel of packet loss rate enter dormancy to accelerate the speed of network congestion recovery, adding channel wheel turns formation and continues use after other channels process speed adjustment; The channel that enters dormancy dormancy time to after also add the channel wheel and turn the transmission that formation participates in data.
The present invention also provides a kind of and has adopted above-mentioned many network self-adaptings to select the wireless video transmission system of switched transmission method, comprise transmission terminal and Surveillance center, be connected with 3G module, Wi-Fi module and ethernet module on the described transmission terminal, described transmission terminal accesses Internet video data is sent to the described Surveillance center on the Internet by 3G module or Wi-Fi module, perhaps accesses Campus Network video data is sent to the described Surveillance center on the Campus Network by the Wi-Fi module; When Wireless signal blind zone but cable network can reach the time, described transmission terminal has access to spider lines video data is sent to described Surveillance center by ethernet module.
The invention has the beneficial effects as follows by will be based on many network self-adaptings access strategy of transmission delay, combine based on the dynamic switchover policy of the Wireless Heterogeneous Networks of link-quality and the adaptively selected transmission policy of multichannel of wireless homogeneous network, be applied to wireless video transmission system, success rate and the speed of setting up data transmission link have not only been improved, and realized that the link that detects based on link-quality dynamically switches and multi-channel transmission and the transmission speed control of the detection of group-based Loss Rate, greatly improve transmission quality and transmission speed in the video data transmitting process, had very strong Practical significance and wide application prospect.
Description of drawings
Fig. 1 adopts many network self-adaptings to select the system block diagram of the wireless video transmission system of switched transmission method in the embodiment of the invention.
Fig. 2 is based on the workflow diagram of many network self-adaptings access strategy of transmission delay in the embodiment of the invention.
Fig. 3 is based on the workflow diagram of the dynamic switchover policy of the Wireless Heterogeneous Networks of link-quality in the embodiment of the invention.
Fig. 4 is the workflow diagram that Surveillance center's data flow is redirected in the embodiment of the invention.
Fig. 5 is the workflow diagram of multichannel robin scheduling algorithm in the embodiment of the invention.
Embodiment
Many network self-adapting of the present invention is selected switched transmission method, comprises many network self-adaptings access strategy based on transmission delay, based on the dynamic switchover policy of the Wireless Heterogeneous Networks of link-quality and the adaptively selected transmission policy of multichannel of wireless homogeneous network.After transmission terminal starts, when described transmission terminal can't be set up link by static configuration and Surveillance center, adopt and carry out selection, registration and the network insertion of link based on many network self-adaptings access strategy of transmission delay; When described transmission terminal at the link of registration when carrying out transfer of data, adopt based on the dynamic switchover policy of the Wireless Heterogeneous Networks of link-quality the quality condition of other link is detected to determine whether dynamically switch transmission in real time.
When static configuration initial link circuit can't arrive Surveillance center the time, the foundation of link is carried out in employing based on many network self-adaptings access strategy of transmission delay, the flow process of described many network self-adaptings access strategy based on transmission delay may further comprise the steps as shown in Figure 2:
(1) link preliminary election, be that described transmission terminal carries out destination identification by the IP address sort: if the IP address of Surveillance center is private ip, namely be positioned among 3 IP address spaces that RFC1918 reserves, judge that then described Surveillance center is positioned at Campus Network, preliminary election ethernet module or Wi-Fi module are set up initial link circuit, if the IP address of Surveillance center is public network IP, then preliminary election 3G module or Wi-Fi module are set up initial link circuit.
(2) link test: when having many preliminary election links, namely for private ip, exist Ethernet to connect and a plurality of Wi-Fi Hotspot, or for publicly-owned IP, in the situation that 3G signal and public network Wi-Fi Hotspot all exist, then pre-each bar preliminary election link of access is undertaken by UDP Echo service that destination can reach test and transmission delay adds up to select optimum link, and it is 5 mean values that UDP Echo divides into groups two-way time that link transmission postpones.
(3) link establishment: select optimum link, the initialization transformation parameter also carries out transfer of data; The access way of link is: for private ip, ethernet module connected with network cable or Wi-Fi module connect focus automatic acquisition IP address; For publicly-owned IP, the 3G module is obtained public network IP by ppp agreement or Wi-Fi module by the ppoe agreement.
The flow process of the dynamic switchover policy of described Wireless Heterogeneous Networks based on link-quality is carried out as shown in Figure 3 as follows:
When transmission terminal entered into another control point from a control point, wireless link environment was on every side constantly changing.The transmission quality of Wi-Fi network (bandwidth, reliability) is much better than 3G network generally speaking.Therefore, be that the telecommunications Wi-Fi Hotspot of ChinaNet exists and during signal stabilization, will dynamically switch in the Wi-Fi network and transmit when transmission terminal monitors SSID, to improve real-time and the reliability of transmission of video, discharge simultaneously the 3G link; When telecommunications Wi-Fi Hotspot signal strength signal intensity weakened gradually, described transmission terminal switched to again on the 3G link and transmits.
Dynamically switch the transmission delay that causes, packet loss to the impact of transmission of video in order to reduce as far as possible, the mode that the dynamic switchover policy of described Wireless Heterogeneous Networks based on link-quality adopts RSSI signal strength detection and link pre-registration to combine realizes dynamically switching transmission: as the RSSI of Wi-Fi Hotspot during greater than set point-50dB, then registered in advance Wi-Fi link obtains public network IP, if in two continuous sense cycle, RSSI changes less than set point or strengthens to some extent, then video flowing is switched on the Wi-Fi link and transmits; When the RSSI of Wi-Fi Hotspot tapered off trend, namely in three sense cycle, when RSSI reduced to surpass 5dB, then registered in advance 3G link obtained public network IP, and rear directly video flowing being switched on the 3G link of succeeding in registration transmitted; Before link switching was finished, video flowing still transmitted in original link.
When video flowing transmitted from original link switching to new link, variation had occured in source IP address, therefore also must be redirected video flowing, to guarantee that Surveillance center can carry out homology to follow-up video flowing and process.Because the video data transmitting of the inventive method is realized based on udp protocol, therefore, when data are transmitted from original link switching to new link, sends route as long as specify, and does not exist TCP to connect the problem that is redirected on transport layer.And on application layer, then by fields such as the device number in the heading, sequence number, session signs, realize being redirected and being connected of data flow.The flow process that Surveillance center's data flow is redirected as shown in Figure 4.
Device number (32bit): being used for the unique identification transmission terminal, is the foundation of data flow and control stream homology.
Sequence number (32bit): be combined with device number, it is the foundation of homology video flowing restructuring.Switch owing to adopting udp protocol and existing dynamically, the stream of video packets that arrives Surveillance center can't sequentially arrive in assurance.
Session sign (32bit): the foundation that control stream is redirected.After dynamically switching, video streaming adopts new session sign, and Surveillance center controls the redirected of stream, the IP address of namely again binding remote equipment according to this session sign.
The method adopts the adaptively selected transmission policy of the multichannel of wireless homogeneous network to carry out many 3G module concurrent transmission, with on the basis that guarantees video transmission quality, improve network bandwidth utilization factor, the adaptively selected transmission policy of the multichannel of described wireless homogeneous network comprises be used to the adaptive flow control strategy of the group-based Loss Rate of avoiding network congestion and many 3G channel self-adapting selects transmission policy.
The adaptive flow control strategy of described group-based Loss Rate is dynamically adjusted transmission rate according to the fixing packet loss rate that sends in the interval.Definite method of packet loss rate is:
Surveillance center is after receiving first packet, the blocked byte number that beginning timing statistical interval was received in the time, be 10s the blanking time of statistics, then mails to transmission terminal by feedback packet, comprises the actual blocked byte of receiving of Surveillance center in the described feedback packet and count S
RecvAfter described transmission terminal is received feedback packet, count S in conjunction with the actual blocked byte that sends in blanking time
SendCalculate packet loss rate P
LostBut because the variation of network often is paroxysmal, the variation of one or two subparameter can not represent the real variation of network once in a while, and network self has certain recovery capability to congested.Therefore, adopt packet loss rate P
LostWith the packet loss rate P that recorded last time
LastlostMean value as this packet loss rate P that records
Curlost, with this criterion as packet loss rate, specifically see following formula (1):
Wherein, P
LastlostBe the packet loss rate that recorded last time, P
LostFor passing through S
RecvAnd S
SendThe packet loss rate that calculates;
In order to reflect better the situation of network, the thresholding of packet loss rate is divided into two grades, namely set the thresholding P of packet loss rate
Low, P
Up, wherein, P
Up=2P
Low, P
LowThe packet loss rate of actual test is as standard setting in the feedback interval.When packet loss rate less than P
LowThe time, the expression current network is in light condition, improves transmission rate this moment or improve transmission rate to increase step-length, and the step-length of growth is 10Byte; When packet loss rate is positioned at [P
Low, P
Up] between the time, the expression current network enters the Congestion Avoidance state, reduces transmission rate this moment and increases step-length or reduce transmission rate, the step-length of adjusting speed is 5Byte; When packet loss rate surpasses P
UpThe time, the expression current network is in congestion state, reduces transmission rate this moment; The speed adjustment algorithm of group-based Loss Rate is seen formula (2):
（2）
The data volume that sends has been shunted in multi channel use, and the load that has alleviated individual channel is conducive to congested avoiding.But, single-channel load is higher also to have increased congested risk, therefore, the present invention lays particular emphasis on the maintenance of channel transmission quality, be that each channel is kept common transmission rate (60% ~ 90%), because just there is congested recovery capability in network self, low transmission rate can reduce the probability of congested generation.Then by the co-operation of a plurality of channels, jointly improve transmission rate.The multichannel co-operation adopts described many 3G channel self-adapting to select transmission policy to carry out as follows: transmission terminal safeguards that a channel wheel turns formation, when having data to send, turn the channel transmission of choosing the free time the formation according to the FIFO mode from described channel wheel; When receiving the feedback packet of Surveillance center, upgrade described channel wheel according to the packet loss rate that records and turn formation; If the packet loss rate of several channels has surpassed congestion threshold, then allow a highest channel of packet loss rate enter dormancy to accelerate the speed of network congestion recovery, adding channel wheel turns formation and continues use after other channels process speed adjustment; The channel that enters dormancy dormancy time to after also add the channel wheel and turn the transmission that formation participates in data.The dormancy time of general channel is much smaller than feedback cycle.Multichannel robin scheduling algorithm as shown in Figure 5.After adding multichannel robin scheduling algorithm, the transmission rate R of channel n (n) is calculated by formula (3).
Select switched transmission method based on above-mentioned many network self-adaptings, the present invention has realized a kind of wireless video transmission system that adopts said method, as shown in Figure 1, comprise transmission terminal and Surveillance center, be connected with 3G module, Wi-Fi module and ethernet module on the described transmission terminal, described transmission terminal accesses Internet video data is sent to the described Surveillance center on the Internet by 3G module or Wi-Fi module, perhaps accesses Campus Network video data is sent to the described Surveillance center on the Campus Network by the Wi-Fi module; When Wireless signal blind zone but cable network can reach the time, described transmission terminal has access to spider lines video data is sent to described Surveillance center by ethernet module.
More than be preferred embodiment of the present invention, all changes of doing according to technical solution of the present invention when the function that produces does not exceed the scope of technical solution of the present invention, all belong to protection scope of the present invention.
Claims (5)
1. network self-adapting more than a kind is selected switched transmission method, it is characterized in that: after transmission terminal starts, when described transmission terminal can't be set up link by static configuration and Surveillance center, adopt and carry out selection, registration and the network insertion of link based on many network self-adaptings access strategy of transmission delay; When described transmission terminal at the link of registration when carrying out transfer of data, adopt based on the dynamic switchover policy of the Wireless Heterogeneous Networks of link-quality the quality condition of other link is detected to determine whether dynamically switch transmission in real time;
Described many network self-adaptings access strategy based on transmission delay may further comprise the steps:
(1) link preliminary election, be that described transmission terminal carries out destination identification by the IP address sort: if the IP address of Surveillance center is private ip, judge that then described Surveillance center is positioned at Campus Network, preliminary election ethernet module or Wi-Fi module are set up initial link circuit, if the IP address of Surveillance center is public network IP, then preliminary election 3G module or Wi-Fi module are set up initial link circuit;
(2) link test: when having many preliminary election links, namely exist Ethernet to connect and a plurality of Wi-Fi Hotspot for private ip, or exist for publicly-owned IP in the situation of 3G signal and public network Wi-Fi Hotspot, then pre-each bar preliminary election link of access carries out that destination can reach test and transmission delay adds up to select optimum link;
(3) link establishment: select optimum link, the initialization transformation parameter also carries out transfer of data; The access way of link is: for private ip, ethernet module connected with network cable or Wi-Fi module connect focus automatic acquisition IP address; For publicly-owned IP, the 3G module is obtained public network IP by ppp agreement or Wi-Fi module by the ppoe agreement;
The dynamic switchover policy of described Wireless Heterogeneous Networks based on link-quality carries out as follows: when transmission terminal monitors that Wi-Fi Hotspot exists and during signal stabilization, then dynamically switches in the Wi-Fi network and transmit, discharge simultaneously the 3G link; When the Wi-Fi Hotspot signal strength signal intensity weakened gradually, described transmission terminal switched to again on the 3G link and transmits.
2. many network self-adaptings according to claim 1 are selected switched transmission method, it is characterized in that: the mode that the dynamic switchover policy of described Wireless Heterogeneous Networks based on link-quality adopts RSSI signal strength detection and link pre-registration to combine realizes dynamically switching transmission: as the RSSI of Wi-Fi Hotspot during greater than set point, then registered in advance Wi-Fi link obtains public network IP, if in several continuous sense cycle, RSSI changes less than set point or strengthens to some extent, then switches on the Wi-Fi link and transmits; When the RSSI of Wi-Fi Hotspot tapered off trend, namely in several sense cycle, when RSSI reduced to surpass certain value, then registered in advance 3G link obtained public network IP, is directly switch to after succeeding in registration on the 3G link and transmits; Before link switching was finished, data were still transmitted in original link.
3. many network self-adaptings according to claim 1 are selected switched transmission method, it is characterized in that: the method adopts udp protocol to carry out transfer of data, when data are transmitted from original link switching to new link, by device number, sequence number, session attribute field in the heading, carry out being redirected and being connected of data flow in application layer.
4. many network self-adaptings according to claim 1 are selected switched transmission method, it is characterized in that: the method comprises that also the adaptively selected transmission policy of the multichannel that adopts wireless homogeneous network carries out many 3G module concurrent transmission, to improve network bandwidth utilization factor, the adaptively selected transmission policy of the multichannel of described wireless homogeneous network comprises be used to the adaptive flow control strategy of the group-based Loss Rate of avoiding network congestion and many 3G channel self-adapting selects transmission policy;
The adaptive flow control strategy of described group-based Loss Rate is dynamically adjusted transmission rate according to the fixing packet loss rate that sends in the interval; Definite method of packet loss rate is: Surveillance center is after receiving first packet, the blocked byte number that beginning timing statistical interval was received in the time, then mail to transmission terminal by feedback packet, comprise the actual blocked byte of receiving of Surveillance center in the described feedback packet and count S
RecvAfter described transmission terminal is received feedback packet, count S in conjunction with the actual blocked byte that sends in blanking time
Send, calculate the packet loss rate P that this records by following formula (1)
Curlost, with this criterion as packet loss rate:
Wherein, P
LastlostBe the packet loss rate that recorded last time, P
LostFor passing through S
RecvAnd S
SendThe packet loss rate that calculates;
Set the thresholding P of packet loss rate
Low, P
Up, wherein, P
Up=2P
LowWhen packet loss rate less than P
LowThe time, the expression current network is in light condition, improves transmission rate this moment or improve transmission rate to increase step-length; When packet loss rate is positioned at [P
Low, P
Up] between the time, the expression current network enters the Congestion Avoidance state, reduces transmission rate this moment and increases step-length or reduce transmission rate; When packet loss rate surpasses P
UpThe time, the expression current network is in congestion state, reduces transmission rate this moment;
Described many 3G channel self-adapting selection transmission policy carries out as follows: channel wheel of transmission terminal maintenance turns formation, when having data to send, turns the channel transmission of choosing the free time the formation according to the FIFO mode from described channel wheel; When receiving the feedback packet of Surveillance center, upgrade described channel wheel according to the packet loss rate that records and turn formation; If the packet loss rate of several channels has surpassed congestion threshold, then allow a highest channel of packet loss rate enter dormancy to accelerate the speed of network congestion recovery, adding channel wheel turns formation and continues use after other channels process speed adjustment; The channel that enters dormancy dormancy time to after also add the channel wheel and turn the transmission that formation participates in data.
5. adopt the wireless video transmission system such as method as described in the claim 1,2,3 or 4, it is characterized in that: comprise transmission terminal and Surveillance center, be connected with 3G module, Wi-Fi module and ethernet module on the described transmission terminal, described transmission terminal accesses Internet video data is sent to the described Surveillance center on the Internet by 3G module or Wi-Fi module, perhaps accesses Campus Network video data is sent to the described Surveillance center on the Campus Network by the Wi-Fi module; When Wireless signal blind zone but cable network can reach the time, described transmission terminal has access to spider lines video data is sent to described Surveillance center by ethernet module.
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