CN105227904A - Data transmission method, device and web camera - Google Patents
Data transmission method, device and web camera Download PDFInfo
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- CN105227904A CN105227904A CN201510531019.3A CN201510531019A CN105227904A CN 105227904 A CN105227904 A CN 105227904A CN 201510531019 A CN201510531019 A CN 201510531019A CN 105227904 A CN105227904 A CN 105227904A
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Abstract
The present invention relates to a kind of data transmission method, device and web camera, described method comprises: scanning is wireless signal around, to obtain wireless signal set; The first wireless signal and the second wireless signal is selected in described wireless signal set; Set up backup link according to described second wireless signal, set up primary link according to described first wireless signal; By described primary link transmission data; Periodically send keep-alive packet by described backup link, and receive corresponding response data packet; When Transmission trigger event being detected, be switched to described backup link transmission data.Data transmission method provided by the invention, device and web camera, by setting up backup link in advance, when transmitting the primary link generation Transmission of data, automatically switch on the backup link set up in advance, and continue transmission data, then avoid the terminal being caused transfer of data by the Transmission with primary link, ensure that the continuity of transfer of data, improve the efficiency of transfer of data.
Description
Technical field
The present invention relates to transmission technique field, particularly relate to a kind of data transmission method, device and web camera.
Background technology
Along with people's improving constantly awareness of safety, the application of IP Camera is also more and more extensive, and people wish in city, traffic, the public situation such as office space, have video monitoring equipment to nurse the property safety of self.In the deployment scheme of general video surveillance point, be generally adopt wired network camera, but wireless network camera is because it dispose advantage easily, is used to monitoring field more and more.
Wireless network camera generally uses radio signal (such as Wi-Fi signal) as transmission medium, connects and then be connected to network with WAP (wireless access point) (AP, AccessPoint), thus by Internet Transmission video data.But wireless transmission is easily disturbed, transmission of video during serious interference, will be caused to interrupt; WAP (wireless access point) also easily breaks down, and video data transmission also can be caused to interrupt.
Summary of the invention
Based on this, be necessary in conventional wireless transmission of video because wireless transmission is disturbed or fault and easily cause the problem of Transmission, a kind of data transmission method, device and web camera are provided.
A kind of data transmission method, described method comprises:
Scanning is wireless signal around, to obtain wireless signal set;
The first wireless signal and the second wireless signal is selected in described wireless signal set;
Set up backup link according to described second wireless signal, set up primary link according to described first wireless signal;
By described primary link transmission data;
Periodically send keep-alive packet by described backup link, and receive corresponding response data packet;
When Transmission trigger event being detected, be switched to described backup link transmission data.
Above-mentioned data transmission method, first scan the wireless signal of surrounding, obtain wireless signal set, then from wireless signal set, select the first wireless signal and the second wireless signal, and set up primary link with the first wireless signal, set up backup link with the second wireless signal.And need regularly to send keep-alive packet by backup link, and to receive corresponding response data packet to keep backup link be effective.When Transmission trigger event being detected, such as when primary link breaks down or be interfered, being directly switch to the backup link established in advance, using backup link to continue transmission data.Like this because backup link is set up in advance, avoid needs when primary link breaks down rescan and set up the situation of link, save and re-establish the road time used, because interference or fault cause the situation of data-transmission interruptions as far as possible when can avoid wirelessly transmitting data.
Wherein in an embodiment, describedly in described wireless signal set, select the first wireless signal and the second wireless signal comprises:
Gather the signal quality parameter that described wireless signal concentrates each wireless signal;
According to described signal quality parameter, the wireless signal in described wireless signal set is marked;
According to the score value of each wireless signal in described wireless signal set, in described wireless signal set, select the first wireless signal and the second wireless signal.
Like this while scanning ambient signals, also gather the signal quality parameter of each wireless signal in wireless signal set, the signal quality parameter collected by these is marked to the wireless signal in wireless signal set.The score value that scoring obtains just can reflect the transmission quality of wireless signal, the first wireless signal and the second wireless signal is selected like this according to the transmission quality of wireless signal, then can set up the primary link and backup link that are applicable to transmission, ensure data transmission quality.
Wherein in an embodiment, the described score value according to each wireless signal in described wireless signal set, in described wireless signal set, select the first wireless signal and the second wireless signal, comprising:
The score value of each wireless signal in more described wireless signal set, using wireless signal the highest for score value as the first wireless signal, using secondary for score value high wireless signal as the second wireless signal.
Like this score value of wireless signal each in wireless signal set is compared, using wireless signal the highest for score value as the first wireless signal, using secondary for score value high wireless signal as the second wireless signal, and score value can reflect the transmission quality of wireless signal.Set up primary link according to the first wireless signal like this, set up backup link according to the second wireless signal, the transmission quality of primary link is that in transmission environment, transmission quality is the highest, and backup link is that in transmission environment, transmission quality is secondary high.In the process of transmission data, the data transmission link used is the primary link that transmission quality is the highest, improves the quality of transfer of data, and adopts the secondary high link of transmission quality as backup link, even if primary link unavailable needs is switched to backup link, also can ensure communication quality as far as possible.
Wherein in an embodiment, described by described primary link transmission data, comprising:
Periodically sent the cycle of keep-alive packet by described backup link described in acquisition, when the described cycle is greater than Preset Time, then sending buffering area by needing the data sent by described primary link to put into, obtaining the data in described transmission buffering area and being sent by described primary link;
When switching back described primary link from described backup link, continue the data in the described transmission buffering area of acquisition and sent by described primary link.
Like this when the cycle is greater than Preset Time, the data needing to be sent by primary link are cushioned by sending buffering area, then the data cushioned in reading transmission buffer area are transmitted.When being periodically switched to described backup link and sending keep-alive packet and receive corresponding response data packet; link switching to be transmitted returns primary link; then continue acquisition send the data in buffering area and continue through described primary link transmission data, by arranging buffering area to eliminate the data break period caused because link takies.Like this when handoff links sends keep-alive packet, avoid the interruption of transfer of data, ensure that the continuity of transfer of data.
Wherein in an embodiment, described method also comprises:
Wireless signal around periodic scanning;
Obtain the signal quality parameter of the wireless signal of periodic scanning again to mark;
When the score value of the score value of again marking higher than described first wireless signal, the wireless signal corresponding to the score value of again marking re-establishes primary link; Or when the score value of the score value of again marking higher than described second wireless signal, the wireless signal corresponding to the score value of again marking re-establishes backup link.
Regularly signal quality parameter is obtained to around wireless signal scan, by calculating score value to these signal parameters, the score value of the wireless signal after scoring higher than the first wireless signal, then re-establishes primary link, if score value higher than the second wireless signal, then re-establishes backup link.In normal communication process, due to the unsteadiness of wireless signal, the data transmission quality of wireless signal is also in continuous change, therefore can keep in data transmission procedure according to such scheme, primary link and backup link are all in the link that in transmission environment, transmission quality is higher, improve the quality of transfer of data.
A kind of data transmission device, described device comprises:
Scan module, for scanning wireless signal around, to obtain wireless signal set;
Choose module, for selecting the first wireless signal and the second wireless signal in described wireless signal set;
Link establishment module, sets up backup link with described second wireless signal, sets up primary link with described first wireless signal, and by described primary link transmission data;
Keep-alive module, regularly sends keep-alive packet by described backup link, and receives corresponding response data packet;
Handover module, when Transmission trigger event being detected, for switching described primary link and described backup link.
Above-mentioned data transmission device, first scan module scanning wireless signal around, obtain wireless signal set, choose module and from wireless signal set, select the first wireless signal and the second wireless signal again, link establishment module and the first wireless signal set up primary link, set up backup link with the second wireless signal.Keep-alive module needs regularly to send keep-alive packet by backup link, and to receive corresponding response data packet to keep backup link be effective.When handover module detects Transmission trigger event, such as when primary link breaks down or be interfered, be directly switch to the backup link established in advance, and use backup link to continue transmission data.Like this because backup link is set up in advance, avoid needs when primary link breaks down rescan and set up the situation of link, save and re-establish the road time used, because interference or fault cause the situation of data-transmission interruptions as far as possible when can avoid wirelessly transmitting data.
Wherein in an embodiment, described scan module concentrates the signal quality parameter of each wireless signal specifically for gathering described wireless signal, marks to the wireless signal that described wireless signal is concentrated according to described transport quality parameters;
Described module of choosing, specifically for the score value according to each wireless signal in described wireless signal set, selects the first wireless signal and the second wireless signal in described wireless signal set.
Such scan module, while scanning ambient signals, also gathers the signal quality parameter of wireless signal, the signal collected by these
Mass parameter is marked to the wireless signal in wireless signal set.The score value that scoring obtains just can reflect the transmission quality of wireless signal, choose module like this and select the first wireless signal and the second wireless signal according to the transmission quality of wireless signal, then link establishment module sets up the primary link and backup link that are applicable to transmission, ensures the transmission quality of data.
Wherein in an embodiment, described in choose the score value of module specifically for each wireless signal in more described wireless signal set, using wireless signal the highest for score value as the first wireless signal, using wireless signal time high for scoring as the second wireless signal.
Choose the score value of module to wireless signal each in wireless signal set like this to compare, using wireless signal the highest for score value as the first wireless signal, using secondary for score value high wireless signal as the second wireless signal, and score value can reflect the transmission quality of wireless signal.Link establishment module sets up primary link according to the first wireless signal, backup link is set up according to the second wireless signal, according to score value, the transmission quality of primary link is that in transmission environment, transmission quality is the highest, and backup link is that in transmission environment, transmission quality is secondary high.In the process of transmission data, the data transmission link used is the primary link that transmission quality is the highest, improves the quality of transfer of data, and adopts the secondary high link of transmission quality as backup link, even if primary link unavailable needs is switched to backup link, also can ensure communication quality as far as possible.
Wherein in an embodiment, described transport module, specifically for sending buffering area by needing the data sent by described primary link to put into, being obtained the data in described transmission buffering area and being sent by described primary link;
Described keep-alive module is specifically for regularly calling handover module; interrupt the data in the described transmission buffering area of acquisition and sent by described primary link; be switched to described backup link and send keep-alive packet; and receive corresponding response data packet; and when switching back described primary link, continuing the data in the described transmission buffering area of acquisition and being sent by described primary link.
The data needing to be sent by primary link are cushioned by sending buffering area by transport module, send the data cushioned in buffer area transmit in reading.Keep-alive module is regularly switched to described backup link and sends keep-alive packet; and when receiving corresponding response data packet; when link switching to be transmitted returns primary link; transport module continues the data in the described transmission buffering area of acquisition and continues through described primary link to send data, by arranging buffering area to eliminate the data break period caused because link takies.Like this when handoff links sends keep-alive packet, avoid the interruption of transfer of data, ensure that the continuity of transfer of data.
Wherein in an embodiment, described scan module is specifically for wireless signal described around periodic scanning, and the signal quality parameter obtaining the described wireless signal of periodic scanning is again to mark;
If during the score value of the score value of again marking higher than described first signal, the wireless signal of link establishment module corresponding to the score value of again marking re-establishes primary link;
If during the scoring of the score value of again marking higher than described second wireless signal, the wireless signal of link establishment module corresponding to the score value of again marking re-establishes backup link.
Scan module regularly obtains signal quality parameter to around wireless signal scan, by calculating score value to these signal parameters, the score value of the wireless signal after scoring is higher than the first wireless signal, then link establishment module re-establishes primary link, if score value is higher than the second wireless signal, then link establishment module re-establishes backup link.In normal communication process, due to the unsteadiness of wireless signal, the data transmission quality of wireless signal, also in continuous change, can keep in data transmission procedure like this, primary link and backup link are all in the link that in transmission environment, transmission quality is higher, improve the quality of transfer of data.
A kind of web camera, is characterized in that, comprising:
Wireless signal receiver, for scanning wireless signal around;
Imageing sensor, for gathering video data;
Processor, for obtaining the wireless signal set that around the scanning of described wireless signal receiver, wireless signal obtains; The first wireless signal and the second wireless signal is selected in described wireless signal set; By described wireless signal transceiver to set up backup link according to described second wireless signal, set up primary link according to described first wireless signal; By described primary link transmitting video data; Regularly send keep-alive packet by described backup link, and receive corresponding response data packet; When Transmission trigger event being detected, being switched to described backup link and continuing transmitting video data.
Above-mentioned web camera, first wireless signal transceiver scanning wireless signal around, obtains the signal quality parameter of wireless signal.Processor is marked to wireless signal according to the signal quality parameter of wireless signal, from the wireless signal that wireless signal receiver scans, wireless signal set is chosen according to scoring, and in wireless signal set, select the first wireless signal and the second wireless signal, backup link is set up by wireless signal transceiver and the second wireless signal, primary link is set up with the first wireless signal, and by primary link transmitting video data.Processor is regularly sent keep-alive packet by backup link and is received response data packet and keeps the unimpeded of backup link.When processor detects Transmission trigger event, then backup link is switched to continue transmitting video data.Primary link break down or disturbed and interrupt time, then the transmission of video data is not interrupted, and video data can keep continuous, and the transmission of video data is unaffected, makes video data transmission become more reliable.
Accompanying drawing explanation
Fig. 1 is the applied environment figure of data transmission system in an embodiment;
Fig. 2 is the schematic flow sheet of the data transmission method in an embodiment;
Fig. 3 is the schematic flow sheet selecting the first wireless signal and the second wireless signal step in an embodiment in wireless signal set;
Fig. 4 is the structured flowchart of the data transmission device in an embodiment;
Fig. 5 is the structured flowchart of the web camera in an embodiment;
Fig. 6 is the sequential chart of the data transmission method in an embodiment;
Fig. 7 is the schematic flow sheet of the data transmission method in another embodiment.
Embodiment
For enabling above-mentioned purpose of the present invention, feature and advantage become apparent more, are described in detail the specific embodiment of the present invention below in conjunction with accompanying drawing.Set forth a lot of detail in the following description so that fully understand the present invention.But the present invention can be much different from alternate manner described here to implement, those skilled in the art can when without prejudice to doing similar improvement when intension of the present invention, therefore the present invention is by the restriction of following public concrete enforcement.
Fig. 1 is the applied environment figure of data transmission system in an embodiment.Data transmission system comprises wireless terminal 110 and multiple WAP (wireless access point) (the WAP (wireless access point) 120a in such as Fig. 1 and WAP (wireless access point) 120b), WAP (wireless access point) 120a, 120b can with transmitted data on network.Wherein WAP (wireless access point) (AP, AccessPoint) is the access point of a wireless network, is commonly called as " focus ".Mainly contain route switching access equipment integrating and pure access point apparatus, equipment integrating performs access and route work, pure access device is only responsible for the access of wireless client, pure access device uses usually used as wireless network expansion, be connected with other AP or main AP, to expand wireless coverage, and equipment integrating is generally the core of wireless network.
Wireless terminal 110 is can image data by the equipment of wireless transmission data, comprise at least one in monitor, web camera, smart mobile phone, notebook computer and panel computer etc.Wherein web camera (IPC, IPCamera) is combined by network code module and analog video camera.The analog video signal compression coding that analog video camera collects by network code module becomes digital signal, thus can directly exchange and routing device by access network.The built-in embedded chip of web camera, adopts embedded real-time operating system.Compressed by Efficient Compression chip after the video signal digitization that web camera sends, be sent to Web server by network-bus.On network user can directly with browser viewing Web server on web camera image, authorized user can also net control camera lens action or system configuration is operated.
As shown in Figure 2, in one embodiment, provide a kind of data transmission method, the wireless terminal 110 that the present embodiment is applied in the data transmission system in above-mentioned Fig. 1 in this way illustrates.This wireless terminal 110 runs and has data distributing program, implement this data transmission method by this data distributing program.The method specifically comprises the steps:
Step 201, scanning is wireless signal around, to obtain wireless signal set.
Particularly, at least there are two WAP (wireless access point) around wireless terminal, each WAP (wireless access point) launches corresponding wireless signal, and the wireless signal that wireless terminal these WAP (wireless access point) to surrounding are launched scans, thus the wireless signal set that the wireless signal obtaining scanning acquisition is formed.Wireless signal set at least comprises two wireless signals, and each wireless signal is respectively from different WAP (wireless access point).In one embodiment, all wireless signals scanned can be formed wireless signal set by wireless terminal.
In one embodiment, step 201 comprises: scanning wireless signal around, forms wireless signal set by according to the wireless signal of predetermined number before the time sequencing sequence scanning wireless signal.When wherein sorting according to time sequencing, the wireless signal more first scanned is more forward.The wireless signal of the predetermined number first scanned preferentially is formed wireless signal set by such wireless terminal, can ensure the efficient of data transmission method.Predetermined number can set as required, also dynamically can set according to the wireless signal quantity scanned.
In one embodiment, step 201 comprises: scanning is wireless signal around, obtains the signal quality parameter of the wireless signal scanned, and then carries out the set of screening acquisition wireless signal according to signal quality parameter to the wireless signal scanned.Wherein signal quality parameter comprises at least one in signal strength signal intensity, channel utilization, the error rate and retransmission rate etc.Such as, signal strength signal intensity can be formed wireless signal set higher than the wireless signal of preset strength by wireless terminal, or the wireless signal scanned can be formed wireless signal set according to the wireless signal getting predefine quantity after signal strength signal intensity descending sort by wireless terminal.
Step 202, selects the first wireless signal and the second wireless signal in wireless signal set.
Particularly, the first wireless signal and the second wireless signal are used for distinguishing different wireless signals, and the first wireless signal can be multiple, and the second wireless signal also can be multiple.Each wireless signal and the WAP (wireless access point) one_to_one corresponding launching this wireless signal of wireless signal set.
In one embodiment, step 202 comprises: in wireless signal set, random selecting two wireless signals are respectively as the first wireless signal and the second wireless signal.
In one embodiment, step 202 comprises: according to the signal quality parameter of wireless signal each in wireless signal set to select the first wireless signal and the second wireless signal from wireless signal set.Wherein, signal quality parameter comprises at least one in signal strength signal intensity, channel utilization, the error rate and retransmission rate etc.Such as, wireless signal can concentrate wireless signal according to after channel utilization descending sort by wireless terminal, chooses the highest wireless signal of channel utilization as the first wireless signal, chooses the secondary high wireless signal of channel utilization as the second wireless signal; Or wireless signal concentrates the signal strength parameter of wireless signal and channel utilization parameter to carry out summation operation by wireless terminal, according to suing for peace, the value obtained carries out descending to wireless signal, choose come first wireless signal as the first wireless signal, choose come second wireless signal as the second wireless signal.
Step 203, sets up backup link according to the second wireless signal, sets up primary link according to the first wireless signal.
Particularly, primary link is used for transmitting data in normal data transmission procedure, and backup link is used for when primary link generation Transmission, is switched to backup link and continues transmission data, ensure not interrupting of transfer of data.
In one embodiment, wireless terminal sends request to the WAP (wireless access point) of transmitting first wireless signal the packet connected, and the WAP (wireless access point) of launching the first wireless signal returns response data packet, then primary link has been set up.Wireless terminal sends request to the WAP (wireless access point) of transmitting second wireless signal the packet connected, and the WAP (wireless access point) of launching the second wireless signal returns response data packet, and backup link has been set up.
Step 204, transmits data by primary link.
Particularly, after wireless terminal chooses the first wireless signal and the second wireless signal, wireless terminal can set up primary link according to the first wireless signal, and sets up backup link according to the second wireless signal.After establishing primary link and backup link, wireless terminal will transmit data by primary link.
In one embodiment, step 203 comprises: first set up backup link according to the second wireless signal, then set up primary link according to the first wireless signal.When such wireless terminal performs step 204 after performing step 203, after primary link is set up, directly transmit data by primary link.Because first set up backup link, set up primary link afterwards, when wireless terminal is by primary link transmission data, need not handoff links again, directly after primary link is set up, just can transmit data, which offers a saving handoff links institute's time spent, avoid data-transmission interruptions.
In one embodiment, wireless terminal is when by primary link transmission data, and the data sent by primary link are first cushioned by buffering area by wireless terminal, and the data then in reading buffering area are also transmitted by primary link.Buffering is set and when wireless terminal handoff links, the break period causing transfer of data because of handoff links can be eliminated.
Step 205, periodically sends keep-alive packet by backup link, and receives corresponding response data packet.
Particularly, keep-alive packet, is also heartbeat packet, so-called heartbeat packet be exactly the simple information of wireless terminal timed sending to server, be connected to maintain between server end long.In order to ensure backup link continuously effective; then wireless terminal periodically can send keep-alive packet by backup link; if after have sent keep-alive packet; and receive corresponding response data packet; then represent that backup link is effective; wireless terminal can carry out handoff links when primary link breaks down or wireless signal is subject to severe jamming, to ensure the reliable of transfer of data.
In one embodiment, wireless terminal regularly can send keep-alive packet by backup link, and package beginning timing from sending keep-alive data, if timing receives the respond packet corresponding with the keep-alive packet sent before reaching default reception time limit, then switches back primary link continuation transmission data; If timing does not receive the respond packet corresponding with the keep-alive packet sent in limited time when reaching default reception yet, then switch back primary link and continue to send data, and trigger the step re-establishing backup link.
Particularly; wireless terminal is provided with timer; and preset keep-alive packet triggering intervals and time of reception length; after backup link establishment, timer starts timing; when the time that timer is counted reaches triggering intervals, then trigger the step being sent keep-alive packet by backup link.After sending keep-alive packet, timer restarts timing, if the time of restarting timing reaches time of reception length, and within this time period, do not receive corresponding response data packet, then backup link is invalid, re-establishes backup link.Specifically can refer to the step setting up backup link in step 203 according to the second wireless signal, after backup link establishment, restart timing.If receive corresponding response data packet in time of reception, then backup link is effective, switches back primary link and continues to send data, and restart timing.
In one embodiment, triggering intervals can be set to 1 second to 60 seconds, also can be set to 5 seconds to 30 seconds.Wherein time of reception length can be set to 0.1 second to 1 second, also can be set to 0.2 second to 0.5 second.
In one embodiment, wireless terminal is when re-establishing backup link, and wireless terminal can rescan the wireless signal of surrounding, and in the wireless signal rescaned into, random selecting wireless signal is to set up backup link.
In one embodiment, wireless terminal can obtain the signal quality parameter of the wireless signal rescaned into, and re-establishes backup link according to this signal quality parameter.Signal strength signal intensity in the signal quality parameter of the wireless signal that such as wireless terminal can rescan into compares, and chooses the maximum wireless signal of signal strength signal intensity to set up backup link.
Step 206, when Transmission trigger event being detected, is switched to backup link transmission data.
Particularly, down trigger event, refers to and to break down due to WAP (wireless access point) that primary link is corresponding or wireless signal is interfered and causes the event of data-transmission interruptions.Transmission link, in the normal processes of transfer of data, when it detects Transmission trigger event, then can be switched to backup link from primary link by wireless terminal, continues to read the data sending and cushion in buffering area, and is sent by backup link.
Wireless terminal, after switching to backup link, using switched backup link as new primary link, and can re-establish backup link.Specifically can refer to the step setting up backup link in step 203 according to the second wireless signal.
In one embodiment, wireless terminal is when re-establishing backup link, and wireless terminal can rescan the wireless signal of surrounding, and in the wireless signal rescaned into, random selecting wireless signal is to set up backup link.
In one embodiment, wireless terminal can obtain the signal quality parameter of the wireless signal rescaned into, and re-establishes backup link according to this signal quality parameter.Signal strength signal intensity in the signal quality parameter of the wireless signal that such as wireless terminal can rescan into compares, and chooses the maximum wireless signal of signal strength signal intensity to set up backup link.
Above-mentioned data transmission method, first scan the wireless signal of surrounding, obtain wireless signal set, then from wireless signal set, select the first wireless signal and the second wireless signal, and set up primary link with the first wireless signal, set up backup link with the second wireless signal.And need periodically to send keep-alive packet by backup link, and to receive corresponding response data packet to keep backup link be effective.When Transmission trigger event being detected, such as when primary link breaks down or be interfered, being directly switch to the backup link established in advance, using backup link to continue transmission data.Like this because backup link is set up in advance, avoid needs when primary link breaks down rescan and set up the situation of link, save and re-establish the road time used, because interference or fault cause the situation of data-transmission interruptions as far as possible when can avoid wirelessly transmitting data.
As shown in Figure 3, in one embodiment, step 202 specifically comprises the following steps:
Step 301, gathers the signal quality parameter that wireless signal concentrates each wireless signal.
Particularly, wireless terminal by scanning wireless signal around, and gathers the signal quality parameter of wireless signal.Wherein signal quality parameter comprises at least one in signal strength signal intensity, channel utilization, the error rate and retransmission rate etc.
Step 302, marks to the wireless signal in wireless signal set according to signal quality parameter.
Particularly, wireless terminal carries out computing to the signal quality parameter of each wireless signal, obtains a value for each wireless signal, using the score value of this value as wireless signal.This score value becomes positive correlation with the transmission quality of wireless signal, and namely score value is higher, and the transmission quality of wireless signal is better, and score value is lower, and the transmission quality of wireless signal is poorer.
In one embodiment, if the signal quality parameter of wireless signal is all parameters positively related with the transmission quality of wireless signal, a kind of computing that then signal quality parameter of wireless terminal to wireless signal is averaged in computing, summation operation, sum operation with coefficient and weighted mean operation etc. is marked, and obtains corresponding score value.Wherein with the transmission quality positive correlation of wireless signal, refer to that the parameter value of signal quality parameter is larger, the transmission quality of wireless signal is better; The parameter value of signal quality parameter is less, and the transmission quality of wireless signal is poorer.
In one embodiment, if the signal quality parameter of wireless signal is all the parameters with the transmission quality negative correlation of wireless signal, after then wireless terminal carries out negative correlation computing to the signal quality parameter of wireless signal, a kind of computing carried out in summation operation, sum operation with coefficient and weighted mean operation etc. is marked again, obtains corresponding score value.Wherein with the transmission quality negative correlation of wireless signal, refer to that the parameter value of signal quality parameter is larger, the transmission quality of wireless signal is poorer; The parameter value of signal quality parameter is less, and the transmission quality of wireless signal is better.Negative correlation computing comprises gets negative computing or gets derivative action etc.
In one embodiment, if partial parameters is parameter positively related with the transmission quality of wireless signal in the signal quality parameter of wireless signal, partial parameters is the parameter with the transmission quality negative correlation of wireless signal.After then wireless terminal carries out negative correlation computing to the parameter of negative correlation, a kind of computing carried out in summation operation, sum operation with coefficient and weighted mean operation etc. is marked again and together with the positively related parameter of the transmission quality of wireless signal, obtains corresponding score value.
Step 303, according to the score value of wireless signal each in wireless signal set, selects the first wireless signal and the second wireless signal in wireless signal set.
Particularly, wireless terminal carries out descending sort according to score value to wireless signal, and choose come first wireless signal as the first wireless signal, choose come second wireless signal as the second wireless signal.
In one embodiment, wireless terminal can judge whether the score value of each wireless signal in wireless signal set is greater than preset value one by one, have after the wireless signal of the score value being greater than preset value stop judging when getting two, and using these two wireless signals as the first wireless signal and the second wireless signal.Preset value can generate according to the score value of the normal sample link of some transmission data added up in advance, such as asks the mean value of the score value of these sample links.
In the present embodiment, while scanning ambient signals, also the signal quality parameter of wireless signal is gathered, the signal quality parameter collected by these is marked to the wireless signal in wireless signal set, to obtain the transmission quality of these wireless signals, and select the first wireless signal and the second wireless signal according to the scoring of these wireless signals.By the height of marking according to the transmission quality of wireless signal, choose the first higher wireless signal of scoring and the second wireless signal, namely choose the higher wireless signal of transmission quality and set up the higher link of transmission quality, ensure that the transmission quality of data, improve the efficiency of transfer of data.
In one embodiment, step 303 comprises: the score value comparing each wireless signal in wireless signal set, using wireless signal the highest for score value as the first wireless signal, using secondary for score value high wireless signal as the second wireless signal.Particularly, the score value of wireless signal each in wireless signal set compares by wireless terminal, using wireless signal the highest for score value as the first wireless signal, using secondary for score value high wireless signal as the second wireless signal.
In the present embodiment, the score value of wireless signal each in wireless set is compared, by comparing the score value of these wireless signals, using wireless signal the highest for score value as the first wireless signal, using secondary for score value high wireless signal as the second wireless signal.Set up primary link according to the first wireless signal, set up backup link according to the second wireless signal, according to score value, the transmission quality of primary link is that in transmission environment, transmission quality is the highest, and backup link is that in transmission environment, transmission quality is secondary high.In the process of transmission data, the data transmission link used is the primary link that transmission quality is the highest, and adopts the quality that therefore improve transfer of data, and adopts the secondary high link of transmission quality as backup link, further ensure that the quality of transfer of data.
In one embodiment; step 204 comprises: obtain the cycle periodically being sent keep-alive packet by described backup link; when the cycle is greater than Preset Time; then sending buffering area by needing the data sent by primary link to put into, obtaining the data in described transmission buffering area and being sent by described primary link.When switching back primary link from backup link, continue acquisition and send the data in buffering area and sent by primary link.
In one embodiment, Preset Time can be set to 1 millisecond to 60 milliseconds, also can be set to 5 milliseconds to 30 milliseconds.Wherein the cycle can be set to 1 millisecond to 60 milliseconds, also can be set to 5 milliseconds to 30 milliseconds.
Particularly, wireless terminal obtains periodically by the cycle of concrete backup link transmission protected data bag, and when the cycle is greater than Preset Time, then the data needing to be sent by primary link are first put into buffering area and cushioned by wireless terminal.When wireless terminal uses primary link to send data, read the data in buffering area, after reading data, data are sent to WAP (wireless access point) by wireless terminal, data are sent to server by WAP (wireless access point), and data are sent to long-range terminal by network by server.
Further, link switching, when using primary link transmission data, periodically can be sent keep-alive packet to backup link, and receive response data packet by wireless terminal.When receiving response data packet or reception response data packet time-out, link switching can be returned primary link again by wireless terminal, and wireless terminal can continue to read the data sent in buffering area, and be sent to WAP (wireless access point) by primary link, then sent by WAP (wireless access point).
In the present embodiment, when sending keep-alive packet, when the cycle is greater than Preset Time, will the data sent by primary link be needed to be cushioned by buffering area, then read the data cushioned in buffer area.Periodically be switched to backup link and send keep-alive packet; and when receiving corresponding response data packet; when link switching to be transmitted returns primary link; continue acquisition send the data in buffering area and continue through primary link transmission data, by arranging buffering area to eliminate the data break period caused because link takies.If period ratio Preset Time is little, does not use buffering area to carry out buffered data, directly sent by primary link.By comparing of cycle and Preset Time, optimum scheme is selected to transmit data.Like this when handoff links sends keep-alive packet, avoid the interruption of transfer of data, ensure that the continuity of transfer of data.
In one embodiment, this data transmission method also comprises: wireless signal around periodic scanning; Obtain the signal quality parameter of the wireless signal of periodic scanning again to mark; When the score value of the score value of again marking higher than the first wireless signal, the wireless signal corresponding to the score value of again marking re-establishes primary link; Or when the score value of the score value of again marking higher than the second wireless signal, the wireless signal corresponding to the score value of again marking re-establishes backup link.
Particularly, wireless signal around wireless terminal periodic scanning, and the parameter gathering wireless signal around, then wireless signal is marked again and obtains score value.The score value of wireless terminal relatively around wireless signal, when the score value having the score value of wireless signal higher than the first wireless signal, then the wireless signal that wireless terminal is corresponding with this score value sets up primary link.Or when the score value having the score value of wireless signal higher than the second wireless signal, then the wireless signal that wireless terminal is corresponding with this score value sets up backup link.
In the present embodiment, in normal communication process, due to the unsteadiness of wireless signal, the data transmission quality of wireless signal is also in continuous change, therefore can keep in data transmission procedure according to such scheme, primary link and backup link are all in the link that in transmission environment, transmission quality is higher, improve the quality of transfer of data.
In one embodiment, data comprise at least one in video data, voice data and image data.In the transmitting procedure of video data, if transmission link breaks down, then need to re-establish link, at this moment the transmission of video data will be interrupted, like this by setting up primary link and backup link can be guaranteed when primary link breaks down, automatically switch to backup link and continue transmitting video data, doing so avoids and to break down due to primary link or be infected and easily cause the interruption of video data transmission, improve the quality of video data transmission.
As shown in Figure 4, in one embodiment, provide a kind of data transmission device 400, comprising: scan module 401, choose module 402, link establishment module 403, handover module 404, keep-alive module 405 and transport module 406.
Scan module 401, for scanning wireless signal around, to obtain wireless signal set.
Choose module 402, for selecting the first wireless signal and the second wireless signal in wireless signal set.
Link establishment module 403, for setting up backup link with the second wireless signal, sets up primary link with the first wireless signal.
Transport module 406, for transmitting data by primary link.
Keep-alive module 405, for periodically sending keep-alive packet by backup link, and receives corresponding response data packet.
Handover module 404, for when Transmission trigger event being detected, for switching primary link and backup link.
Above-mentioned data transmission device, first scan module scanning wireless signal around, obtain wireless signal set, choose module and from wireless signal set, select the first wireless signal and the second wireless signal again, link establishment module and the first wireless signal set up primary link, set up backup link with the second wireless signal.Keep-alive module needs periodically to send keep-alive packet by backup link, and to receive corresponding response data packet to keep backup link be effective.When handover module detects Transmission trigger event, such as when primary link breaks down or be interfered, be directly switch to the backup link established in advance, and use backup link to continue transmission data.Like this because backup link is set up in advance, avoid needs when primary link breaks down rescan and set up the situation of link, save and re-establish the road time used, because interference or fault cause the situation of data-transmission interruptions as far as possible when can avoid wirelessly transmitting data.
In one embodiment, scan module 401, specifically for gathering the signal quality parameter of each wireless signal in wireless signal set, is marked to the wireless signal that wireless signal is concentrated according to transport quality parameters.
Choose module 402 specifically for the score value according to wireless signal each in wireless signal set, in wireless signal set, select the first wireless signal and the second wireless signal.
In one embodiment, choose module 402 specifically for comparing the score value of each wireless signal in wireless signal set, using wireless signal the highest for score value as the first wireless signal, using secondary for scoring high wireless signal as the second wireless signal.
In the present embodiment, choose the score value of module 402 to wireless signal each in wireless set to compare, by comparing the score value of these wireless signals, using wireless signal the highest for score value as the first wireless signal, using secondary for score value high wireless signal as the second wireless signal.Link establishment module sets up primary link according to the first wireless signal, backup link is set up according to the second wireless signal, according to score value, the transmission quality of primary link is that in transmission environment, transmission quality is the highest, and backup link is that in transmission environment, transmission quality is secondary high.In the process of transmission data, the data transmission link used is the primary link that transmission quality is the highest, improves the quality of transfer of data, and adopts the secondary high link of transmission quality as backup link, further ensure that the quality of transfer of data.
In one embodiment, transport module 406, specifically for sending buffering area by needing the data sent by primary link to put into, being obtained the data in transmission buffering area and being sent by primary link.
Keep-alive module 405 is specifically for periodically calling handover module 404; be switched to backup link and send keep-alive packet; and receive corresponding response data packet, and when switching back primary link, calling transport module 404 and continue the data in acquisition transmission buffering area and sent by primary link.
In the present embodiment; keep-alive module 405 is after periodically sending keep-alive packet by backup link and receive corresponding response data packet; when transmission link is switched back primary link by be switched module 404; transport module 406 continues acquisition and sends the data in buffering area and continue through primary link transmission data, by arranging buffering area to eliminate the data break period caused because link takies.Like this when handoff links sends keep-alive packet, avoid the interruption of transfer of data, ensure that the continuity of transfer of data.
In one embodiment, scan module 401 is specifically for wireless signal around periodic scanning, and the signal quality parameter obtaining the wireless signal of periodic scanning is again to mark.
If during the score value of the score value of again marking higher than the first signal, the wireless signal of link establishment module 403 corresponding to the score value of again marking re-establishes primary link.
If during the scoring of the score value of again marking higher than the second wireless signal, the wireless signal of link establishment module 403 corresponding to the score value of again marking re-establishes backup link.
Scan module 401 regularly obtains signal quality parameter to around wireless signal scan, by calculating score value to these signal parameters, the score value of the wireless signal after scoring is higher than the first wireless signal, then link establishment module 403 re-establishes primary link, if score value is higher than the second wireless signal, then link establishment module 403 re-establishes backup link.In normal communication process, due to the unsteadiness of wireless signal, the data transmission quality of wireless signal is also in continuous change, said apparatus can keep in data transmission procedure, primary link and backup link are all in the link that in transmission environment, transmission quality is higher, improve the quality of transfer of data.
In one embodiment, the data that data transmission device transmits comprise at least one in video data, voice data, image data.
In the transmitting procedure of data, if transmission link breaks down, then need to re-establish link, this is that the transmission of video data will be interrupted, by setting up primary link and backup link can be guaranteed when primary link breaks down in this device, then automatically switch to backup link and continue transmitting video data, doing so avoids and to break down due to primary link or be interfered and easily cause the interruption of video data transmission, improve the quality of transfer of data.
As shown in Figure 5, in one embodiment, a kind of web camera is provided, comprises: wireless signal transceiver 501, imageing sensor 504 and processor 502.
Wireless signal transceiver 501, for scanning wireless signal around.
Imageing sensor 504, for gathering video data.
Processor 502, for obtaining the wireless signal set that around wireless signal receiver 501 scanning, wireless signal obtains; The first wireless signal and the second wireless signal is selected in wireless signal set; By wireless signal transceiver 501 to set up backup link according to the second wireless signal, set up primary link according to the first wireless signal; By primary link transmitting video data; Periodically send keep-alive packet by backup link, and receive corresponding response data packet; When Transmission trigger event being detected, being switched to backup link and continuing transmitting video data.
In one embodiment, the signal quality parameter of each wireless signal concentrated by processor 502 specifically for gathering wireless signal; According to signal quality parameter, the wireless signal in wireless signal set is marked; According to the score value of wireless signal each in wireless signal set, in wireless signal set, select the first wireless signal and the second wireless signal
In one embodiment, processor 502 specifically for comparing the score value of each wireless signal in wireless signal set, using wireless signal the highest for score value as the first wireless signal, using wireless signal time high for score value as the second wireless signal.
In one embodiment, processor 502 sends buffering area specifically for the data sent by primary link will be needed to put into, and obtains to send data in buffering area and by wireless signal transceiver to send via primary link; Periodically be switched to backup link and send keep-alive packet, and receive corresponding response data packet, and when switching back primary link, continuing acquisition and send the data in buffering area and sent by primary link.
In one embodiment, processor 502 is specifically for wireless signal around periodic scanning; Obtain the signal quality parameter of the wireless signal of periodic scanning again to mark; When the score value of the score value of again marking higher than described first wireless signal, the wireless signal corresponding to the score value of again marking re-establishes primary link; Or when the score value of the score value of again marking higher than the second wireless signal, the wireless signal corresponding to the score value of again marking re-establishes backup link.
Above-mentioned web camera, first wireless signal transceiver 501 scans all wireless signals around, obtains the signal quality parameter of wireless signal.Processor 502 is marked to wireless signal according to the signal quality parameter of wireless signal, from the wireless signal that wireless signal transceiver 501 scans, choose wireless signal set according to scoring, and in wireless signal set, select the first wireless signal and the second wireless signal.Processor 502 sets up backup link by wireless signal transceiver and the second wireless signal, sets up primary link with the first wireless signal, and by primary link transmitting video data.Processor 502 is periodically sent keep-alive packet by backup link and is received response data packet and keeps the unimpeded of backup link.When processor 502 detects Transmission trigger event, then backup link is switched to continue transmitting video data.Primary link break down or disturbed and interrupt time, then the transmission of video data is not interrupted, and video data can keep continuous, and the transmission of video data is unaffected, makes video data transmission become more reliable.
As shown in Figure 5, in one embodiment, web camera also comprises the first analog to digital converter 503, camera lens 505, second analog to digital converter 506, sound transducer 507 and microphone 508.Wherein wireless signal transceiver 501 is connected with processor 502, camera lens 505 is connected with imageing sensor 504, imageing sensor 504 is connected with the first analog to digital converter 503, first analog to digital converter 503 is connected with processor 502, microphone 508 is connected with sound transducer 507, sound transducer 507 is connected with the second analog to digital converter 506, and the second analog to digital converter 506 is connected with processor 502.
In one embodiment, wireless signal transceiver 501 scan for wireless signals, processor 502 chooses the first wireless signal and the second wireless signal according to scanned wireless signal, and sets up primary link by wireless signal transceiver 501 and the first wireless signal and set up backup link with the second wireless signal.Imageing sensor 504 and sound transducer 507 gather Audio and Video data by camera lens 505 and microphone 508, imageing sensor 504 respectively by video data and audio data transmission to image converter 504 and sound transducer 507.Video data in first analog to digital converter 503 pairs imageing sensor 504 carries out analog-to-digital conversion, and the data after conversion are transferred to processor 502.Voice data in second analog to digital converter 506 pairs sound transducer 507 carries out analog-to-digital conversion, and the data after conversion are transferred to processor 502.Processor 502 is sent to WAP (wireless access point) by wireless signal transceiver 501 after carrying out computing to the data received, and WAP (wireless access point) is sent to the webserver, and data are sent to terminal by network by the webserver.
The principle of above-mentioned data transmission method is described by an embody rule scene below, and in this application scene, wireless terminal 110 is web camera.Particularly, reference is as Fig. 6 and Fig. 7:
As shown in Figure 6, that the first wireless signal is corresponding is WAP (wireless access point) 120a, and that the second wireless signal is corresponding is WAP (wireless access point) 120b.Web camera first sets up backup link with WAP (wireless access point) 120b, and web camera sets up primary link with WAP (wireless access point) 120a again.After primary link has been set up, web camera has directly transmitted its data collected by primary link.In the process of primary link transmission data, network shooting chance is periodically switched to backup link to send keep-alive packet, after receiving response data packet, switches back primary link and continues to send data.As Fig. 7, web camera is in the process utilizing primary link transmission data, primary link seriously causes data-transmission interruptions because fault or wireless signal are disturbed, then web camera disconnects primary link, is directly switch to the backup link established in advance and continues transmission data.
Each technical characteristic of the above embodiment can combine arbitrarily, for making description succinct, the all possible combination of each technical characteristic in above-described embodiment is not all described, but, as long as the combination of these technical characteristics does not exist contradiction, be all considered to be the scope that this specification is recorded.
Above embodiment only have expressed several execution mode of the present invention, and it describes comparatively concrete and detailed, but can not therefore be construed as limiting the scope of the patent.It should be pointed out that for the person of ordinary skill of the art, without departing from the inventive concept of the premise, can also make some distortion and improvement, these all belong to protection scope of the present invention.Therefore, the protection range of patent of the present invention should be as the criterion with claims.
Claims (11)
1. a data transmission method, described method comprises:
Scanning is wireless signal around, to obtain wireless signal set;
The first wireless signal and the second wireless signal is selected in described wireless signal set;
Set up backup link according to described second wireless signal, set up primary link according to described first wireless signal;
By described primary link transmission data;
Periodically send keep-alive packet by described backup link, and receive corresponding response data packet;
When Transmission trigger event being detected, be switched to described backup link transmission data.
2. method according to claim 1, is characterized in that, describedly in described wireless signal set, selects the first wireless signal and the second wireless signal, comprising:
Gather the signal quality parameter that described wireless signal concentrates each wireless signal;
According to described signal quality parameter, the wireless signal in described wireless signal set is marked;
According to the score value of each wireless signal in described wireless signal set, in described wireless signal set, select the first wireless signal and the second wireless signal.
3. method according to claim 2, is characterized in that, the described score value according to each wireless signal in described wireless signal set, selects the first wireless signal and the second wireless signal, comprising in described wireless signal set:
The score value of each wireless signal in more described wireless signal set, using wireless signal the highest for score value as the first wireless signal, using secondary for score value high wireless signal as the second wireless signal.
4. method according to claim 3, is characterized in that, described method also comprises:
Wireless signal around periodic scanning;
Obtain the signal quality parameter of the wireless signal of periodic scanning again to mark;
When the score value of the score value of again marking higher than described first wireless signal, the wireless signal corresponding to the score value of again marking re-establishes primary link; Or when the score value of the score value of again marking higher than described second wireless signal, the wireless signal corresponding to the score value of again marking re-establishes backup link.
5. method as claimed in any of claims 1 to 4, is characterized in that, described by described primary link transmission data, comprising:
Periodically sent the cycle of keep-alive packet by described backup link described in acquisition, when the described cycle is greater than Preset Time, then sending buffering area by needing the data sent by described primary link to put into, obtaining the data in described transmission buffering area and being sent by described primary link;
When switching back described primary link from described backup link, continue the data in the described transmission buffering area of acquisition and sent by described primary link.
6. a data transmission device, described device comprises:
Scan module, for scanning wireless signal around, to obtain wireless signal set;
Choose module, for selecting the first wireless signal and the second wireless signal in described wireless signal set;
Link establishment module, for setting up backup link with described second wireless signal, sets up primary link with described first wireless signal;
Transport module, for transmitting data by described primary link;
Keep-alive module, for regularly sending keep-alive packet by described backup link, and receives corresponding response data packet;
Handover module, for when Transmission trigger event being detected, switches described primary link and described backup link.
7. device according to claim 6, it is characterized in that, described scan module concentrates the signal quality parameter of each wireless signal specifically for gathering described wireless signal, mark to the wireless signal that described wireless signal is concentrated according to described transport quality parameters;
Described module of choosing, specifically for the score value according to each wireless signal in described wireless signal set, selects the first wireless signal and the second wireless signal in described wireless signal set.
8. device according to claim 7, it is characterized in that, describedly choose the score value of module specifically for each wireless signal in more described wireless signal set, using wireless signal the highest for score value as the first wireless signal, using wireless signal time high for scoring as the second wireless signal.
9. device according to claim 8, is characterized in that, described scan module is specifically for wireless signal described around periodic scanning, and the signal quality parameter obtaining the described wireless signal of periodic scanning is again to mark;
If during the score value of the score value of again marking higher than described first signal, the wireless signal of link establishment module corresponding to the score value of again marking re-establishes primary link;
If during the scoring of the score value of again marking higher than described second wireless signal, the wireless signal of link establishment module corresponding to the score value of again marking re-establishes backup link.
10. according to the device in claim 6 to 9 described in any one, it is characterized in that, described transport module is specifically for periodically sending the cycle of keep-alive packet described in obtaining by described backup link, when the described cycle is greater than Preset Time, then sending buffering area by needing the data sent by described primary link to put into, obtaining the data in described transmission buffering area and being sent by described primary link;
Described keep-alive module is specifically for periodically calling handover module; be switched to described backup link and send keep-alive packet; and receive corresponding response data packet; and when switching back described primary link, calling transport module and continue the data in the described transmission buffering area of acquisition and sent by described primary link.
11. 1 kinds of web cameras, is characterized in that, comprising:
Wireless signal transceiver, for scanning wireless signal around;
Imageing sensor, for gathering video data;
Processor, for obtaining the wireless signal set that around the scanning of described wireless signal receiver, wireless signal obtains; The first wireless signal and the second wireless signal is selected in described wireless signal set; By described wireless signal transceiver to set up backup link according to described second wireless signal, set up primary link according to described first wireless signal; By described primary link transmitting video data; Regularly send keep-alive packet by described backup link, and receive corresponding response data packet; When Transmission trigger event being detected, being switched to described backup link and continuing transmitting video data.
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