CN103987059A - Anti-interference method and device for wireless local area network - Google Patents
Anti-interference method and device for wireless local area network Download PDFInfo
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Abstract
The invention provides an anti-interference method and device for wireless local area network. The anti-interference method comprises the steps that the channel occupation duration for receiving a message, the channel occupation duration for sending the message, and the non-idle duration of a channel within the preset time are detected; the channel occupation duration, within the preset time, of other signals is calculated according to the channel occupation duration for receiving the message, the channel occupation duration for sending the message and the non-idle duration of the channel; the strategy for judging whether the channel is idle or not is adjusted according to the channel occupation duration, of other signals, so that the capacity for resisting interference of other signals is improved. According to the technical scheme, interference of all the other signals outside the wireless local area network can be reduced, the time for waiting for the channel to be idle is shortened, and the handling capacity of the downlink business can be improved easily.
Description
Technical field
The present invention relates to communication technical field, in particular to a kind of anti-interference method for WLAN (wireless local area network) and a kind of means for anti-jamming for WLAN (wireless local area network).
Background technology
WLAN (Wireless Local Area Network, WLAN (wireless local area network)) technology is a kind of wireless access technology of extensive use, be widely used in the mechanism such as family and enterprise, many important application of enterprise, are all deployed on wireless network gradually services such as voice, video, location.But along with the increase of application, air interference problem shows outstanding day to affecting of network service quality.
Air interference can be divided into WLAN interference according to type and non-WLAN disturbs.Wherein, the WLAN that is called that the wireless signal that interference source sends meets 802.11 standards disturbs, and is all in addition that non-WLAN disturbs.In the realization of WLAN MAC (Media Access Control, media access control) chip, be to meet 802.11 leading repetitive sequences and judge whether interference signal is WLAN signal by detecting whether to have in interference signal.
In the time that WLAN MAC chip has message to send, whether idlely need to first detect channel, this process is called idle channel and detects, be CCA (Clear Channel Assessment), while only having interference signal energy in channel lower than predetermined threshold value (for ease of describing, hereinafter to be referred as CCA threshold value), CCA just can assess on channel noiseless, can carry out the transmission of message, otherwise WLAN MAC chip can postpone the transmission of message, until the interference signal energy in channel is lower than CCA threshold value.
Under normal circumstances, the interference signal that WLAN MAC chip exceedes CCA threshold value to interference signal energy in channel detects, if detect successfully, thinks that this interference signal is WLAN signal, otherwise WLAN MAC chip can produce one and detect mistake, i.e. PhyError.In correlation technique, set CCA threshold value by regular detection the quantity of adding up PhyError, particularly, in the time that PhyError quantity is greater than set point, improve CCA threshold value, in the time that PhyError quantity is less than another set point, reduce CCA threshold value, to avoid in the time that non-WLAN signal disturbs, wait as long for channel idle and cause the problem that downlink business throughput is low.
But, the scheme proposing in correlation technique can only reduce the interference of non-WLAN signal to a certain extent, if but there are multiple WLAN access points at the same area, can exist multiple WLAN signals to disturb for some WLAN access points, cause CCA channel busy to be detected for a long time, thereby wait as long for channel idle, message is difficult to send, and causes the throughput of downlink business low.Particularly, as shown in Figure 1, there is access point 102 and access point 104 in large-scale meeting-place, and multiple work station, be work station 106, work station 108, work station 110 and work station 112, the WLAN that one of them access point can be subject to another access point and multiple work stations disturbs; As shown in Figure 2, can be provided with access point and work station at each floor of office building, also can cause each other WLAN signal to disturb.
Therefore, how to avoid wlan network to be subject to the interference of other WLAN signals and non-WLAN signal simultaneously, reduce the time of waiting for channel idle, and then the throughput of raising downlink business becomes technical problem urgently to be resolved hurrily.
Summary of the invention
The present invention just based on above-mentioned technical problem one of at least, a kind of new Anti jamming Scheme for WLAN (wireless local area network) has been proposed, can reduce the interference of the every other signal except current wireless local area network (LAN), and then reduce the time of waiting for channel idle, be conducive to improve the throughput of downlink business.
In view of this, the present invention proposes a kind of anti-interference method for WLAN (wireless local area network), comprise: detect to receive in the given time the duration of message busy channel and send message and take the duration of described channel, and within the described scheduled time the busy duration of described channel; Take the duration of described channel and other signals of busy duration calculation of described channel and take the duration of described channel within the described scheduled time according to the duration of described reception message busy channel, described transmission message; Within the described scheduled time, take the duration of described channel according to described other signals, adjust the strategy that judges that whether described channel is idle, the ability of disturbing to strengthen described other signals of opposing.
In this technical scheme, by calculating the duration of other signals busy channel within the above-mentioned scheduled time, can determine that disturbed condition that WLAN is subject to other signals as wlan network (particularly, the duration of busy channel is longer, disturb larger), and then can be to judging channel whether adjust by idle strategy, with in the time that the interference that is subject to other signals is larger, can reduce the standard that judges that whether channel is idle, and then can reduce the time of waiting for channel idle, be conducive to the transmission of message, improve the throughput of downlink business.Wherein, other signals had both comprised WLAN signal, comprised again non-WLAN signal, had solved the problem that cannot process the interference of WLAN signal in correlation technique.Calculate other signals in the given time the duration of busy channel be to deduct the duration that receives the duration of message busy channel and send message busy channel and obtain by calculating the busy duration of channel.
In technique scheme, preferably, judge whether idle strategy comprises described channel: detect the signal energy in described channel; Judge whether the signal energy in described channel is less than or equal to predetermined threshold, and in the time determining that signal energy in described channel is less than or equal to described predetermined threshold, judge described channel idle.
Whether in this technical scheme, the signal energy in channel is larger, illustrates that other signals are larger to the occupancy of channel, therefore can pass through the judgement to signal energy in channel, idle to determine channel.
In technique scheme, preferably, within the described scheduled time, take the duration of described channel according to described other signals, adjust and judge whether idle tactful step is specially described channel: the duration and the described scheduled time that within the described scheduled time, take described channel according to described other signals are calculated the occupancy of described other signals to described channel; In the time that described occupancy is more than or equal to the first predetermined value, increase described predetermined threshold; And in the time that described occupancy is less than or equal to the second predetermined value, reduce described predetermined threshold.
In this technical scheme, specifically, in the time that other signals are larger to the occupancy of channel, illustrate that WLAN is subject to the interference of other signals larger, therefore in order to strengthen the antijamming capability of WLAN, the time of channel idle is waited in reduction, can reduce the standard that judges that whether channel is idle, increases the reference quantity (above-mentioned predetermined threshold) that signal energy in channel is judged; And at other signals to the occupancy of channel hour, illustrate that wireless to be subject to the interference of other signals without local area network (LAN) less, therefore for fear of other signals are produced to larger interference, can suitably improve the standard that judges that whether channel is idle, reduce the reference quantity (above-mentioned predetermined threshold) that signal energy in channel is judged.Wherein, the first predetermined threshold and the second predetermined threshold can be set according to the residing real network environment of WLAN.In the time calculating other signals to the occupancy of channel, by calculating the duration of other signal busy channels and the ratio of the scheduled time in the given time, obtain the occupancy of other signals to channel, certainly, also can calculate and receive in the given time the duration of message busy channel and the ratio of the scheduled time, obtain receiving the occupancy of message to channel; And calculate send in the given time the duration of message busy channel and the ratio of the scheduled time, obtain sending the occupancy of message to channel; Similarly, calculate the busy duration of channel and the ratio of the scheduled time in the given time, obtain the total occupancy of channel, deduct and receive message to the occupancy of channel and send the occupancy of message to channel by the total occupancy of channel afterwards, obtain the occupancy of other signals to channel.
In technique scheme, preferably, according to the Duration/ID field of the each message receiving, determine that described each message takies the duration of described channel within the described scheduled time; The duration that all messages that receive is taken to described channel within the described scheduled time adds up, and takies the duration of described channel to obtain receiving message within the described scheduled time.
In this technical scheme, because the Duration/ID field of message represents the duration of message busy channel and at the duration that receives (piece) acknowledgement frame busy channel returning after message, therefore can determine by the Duration/ID field of message the duration of each message busy channel, and then calculating receives the shared channel duration of all messages; The duration of each message busy channel that similarly, the duration of transmission message busy channel also can send by statistics obtains.
In technique scheme, WLAN only, in the time judging described channel idle, just sends message to be sent to receiver side.
According to a further aspect in the invention, a kind of means for anti-jamming for WLAN (wireless local area network) has also been proposed, comprise: detecting unit, receive the duration of message busy channel and send message the duration that takies described channel for detection of interactive unit in the given time, and within the described scheduled time the busy duration of described channel; Processing unit, within the described scheduled time, take the duration of described channel for taking the duration of described channel and other signals of busy duration calculation of described channel according to the duration of described reception message busy channel, described transmission message, and within the described scheduled time, take the duration of described channel according to described other signals, adjust the strategy that judging unit judges that whether described channel is idle, the ability of disturbing to strengthen described other signals of opposing; Described interactive unit, for sending message and receiving message; Described judging unit, whether idle for judging described channel.
In this technical scheme, by calculating the duration of other signals busy channel within the above-mentioned scheduled time, can determine that disturbed condition that WLAN is subject to other signals as wlan network (particularly, the duration of busy channel is longer, disturb larger), and then can be to judging channel whether adjust by idle strategy, with in the time that the interference that is subject to other signals is larger, can reduce the standard that judges that whether channel is idle, and then can reduce the time of waiting for channel idle, be conducive to the transmission of message, improve the throughput of downlink business.Wherein, other signals had both comprised WLAN signal, comprised again non-WLAN signal, had solved the problem that cannot process the interference of WLAN signal in correlation technique.Calculate other signals in the given time the duration of busy channel be to deduct the duration that receives the duration of message busy channel and send message busy channel and obtain by calculating the busy duration of channel.
In technique scheme, preferably, described detecting unit is also for the signal energy that detects described channel; Described judging unit specifically for: judge whether the signal energy in described channel is less than or equal to predetermined threshold, and signal energy in described channel is while being less than or equal to described predetermined threshold, judges described channel idle.
Whether in this technical scheme, the signal energy in channel is larger, illustrates that other signals are larger to the occupancy of channel, therefore can pass through the judgement to signal energy in channel, idle to determine channel.
In technique scheme, preferably, described processing unit comprises: computing unit, and the duration and the described scheduled time that within the described scheduled time, take described channel according to described other signals are calculated the occupancy of described other signals to described channel; Adjustment unit, in the time that described occupancy is more than or equal to the first predetermined value, increases described predetermined threshold; And in the time that described occupancy is less than or equal to the second predetermined value, reduce described predetermined threshold.
In this technical scheme, specifically, in the time that other signals are larger to the occupancy of channel, illustrate that WLAN is subject to the interference of other signals larger, therefore in order to strengthen the antijamming capability of WLAN, the time of channel idle is waited in reduction, can reduce the standard that judges that whether channel is idle, increases the reference quantity (above-mentioned predetermined threshold) that signal energy in channel is judged; And at other signals to the occupancy of channel hour, illustrate that wireless to be subject to the interference of other signals without local area network (LAN) less, therefore for fear of other signals are produced to larger interference, can suitably improve the standard that judges that whether channel is idle, reduce the reference quantity (above-mentioned predetermined threshold) that signal energy in channel is judged.Wherein, the first predetermined threshold and the second predetermined threshold can be set according to the residing real network environment of WLAN.In the time calculating other signals to the occupancy of channel, by calculating the duration of other signal busy channels and the ratio of the scheduled time in the given time, obtain the occupancy of other signals to channel, certainly, also can calculate and receive in the given time the duration of message busy channel and the ratio of the scheduled time, obtain receiving the occupancy of message to channel; And calculate send in the given time the duration of message busy channel and the ratio of the scheduled time, obtain sending the occupancy of message to channel; Similarly, calculate the busy duration of channel and the ratio of the scheduled time in the given time, obtain the total occupancy of channel, deduct and receive message to the occupancy of channel and send the occupancy of message to channel by the total occupancy of channel afterwards, obtain the occupancy of other signals to channel.
In technique scheme, preferably, described detecting unit specifically for: according to the Duration/ID field of the each message receiving, determine that described each message takies the duration of described channel within the described scheduled time; The duration that all messages that receive is taken to described channel within the described scheduled time adds up, and takies the duration of described channel to obtain receiving message within the described scheduled time.
In this technical scheme, because the Duration/ID field of message represents the duration of message busy channel and at the duration that receives (piece) acknowledgement frame busy channel returning after message, therefore can determine by the Duration/ID field of message the duration of each message busy channel, and then calculating receives the shared channel duration of all messages; The duration of each message busy channel that similarly, the duration of transmission message busy channel also can send by statistics obtains.
In technique scheme, preferably, described interactive unit specifically for: in the time that described judging unit is judged described channel idle, send message to be sent to receiver side.
By above technical scheme, can reduce the interference of the every other signal except current wireless local area network (LAN), and then reduce the time of waiting for channel idle, be conducive to improve the throughput of downlink business.
Brief description of the drawings
Fig. 1 to Fig. 2 shows the disturbed condition schematic diagram in existing network environment;
Fig. 3 shows according to an embodiment of the invention the schematic flow diagram for the anti-interference method of WLAN (wireless local area network);
Fig. 4 shows according to an embodiment of the invention the schematic block diagram for the means for anti-jamming of WLAN (wireless local area network);
Fig. 5 shows the structural representation of the transmitting system for WLAN (wireless local area network) according to an embodiment of the invention;
Fig. 6 shows the structural representation for the means for anti-jamming of the system shown in Fig. 5.
Embodiment
In order more clearly to understand above-mentioned purpose of the present invention, feature and advantage, below in conjunction with the drawings and specific embodiments, the present invention is further described in detail.It should be noted that, in the situation that not conflicting, the feature in the application's embodiment and embodiment can combine mutually.
A lot of details are set forth in the following description so that fully understand the present invention; but; the present invention can also adopt other to be different from other modes described here and implement, and therefore, protection scope of the present invention is not subject to the restriction of following public specific embodiment.
Fig. 3 shows according to an embodiment of the invention the schematic flow diagram for the anti-interference method of WLAN (wireless local area network).
As shown in Figure 3, according to an embodiment of the invention for the anti-interference method of WLAN (wireless local area network), comprise: step 302, detect to receive in the given time the duration of message busy channel and send message and take the duration of described channel, and within the described scheduled time the busy duration of described channel; Step 304, takies the duration of described channel and other signals of busy duration calculation of described channel and takies within the described scheduled time duration of described channel according to the duration of described reception message busy channel, described transmission message; Step 306 takies the duration of described channel within the described scheduled time according to described other signals, adjust the strategy that judge that whether described channel is idle, to strengthen the ability of described other signals interference of opposing.
In this technical scheme, by calculating the duration of other signals busy channel within the above-mentioned scheduled time, can determine that disturbed condition that WLAN is subject to other signals as wlan network (particularly, the duration of busy channel is longer, disturb larger), and then can be to judging channel whether adjust by idle strategy, with in the time that the interference that is subject to other signals is larger, can reduce the standard that judges that whether channel is idle, and then can reduce the time of waiting for channel idle, be conducive to the transmission of message, improve the throughput of downlink business.Wherein, other signals had both comprised WLAN signal, comprised again non-WLAN signal, had solved the problem that cannot process the interference of WLAN signal in correlation technique.Calculate other signals in the given time the duration of busy channel be to deduct the duration that receives the duration of message busy channel and send message busy channel and obtain by calculating the busy duration of channel.
In technique scheme, preferably, judge whether idle strategy comprises described channel: detect the signal energy in described channel; Judge whether the signal energy in described channel is less than or equal to predetermined threshold, and in the time determining that signal energy in described channel is less than or equal to described predetermined threshold, judge described channel idle.
Whether in this technical scheme, the signal energy in channel is larger, illustrates that other signals are larger to the occupancy of channel, therefore can pass through the judgement to signal energy in channel, idle to determine channel.
In technique scheme, preferably, within the described scheduled time, take the duration of described channel according to described other signals, adjust and judge whether idle tactful step is specially described channel: the duration and the described scheduled time that within the described scheduled time, take described channel according to described other signals are calculated the occupancy of described other signals to described channel; In the time that described occupancy is more than or equal to the first predetermined value, increase described predetermined threshold; And in the time that described occupancy is less than or equal to the second predetermined value, reduce described predetermined threshold.
In this technical scheme, specifically, in the time that other signals are larger to the occupancy of channel, illustrate that WLAN is subject to the interference of other signals larger, therefore in order to strengthen the antijamming capability of WLAN, the time of channel idle is waited in reduction, can reduce the standard that judges that whether channel is idle, increases the reference quantity (above-mentioned predetermined threshold) that signal energy in channel is judged; And at other signals to the occupancy of channel hour, illustrate that wireless to be subject to the interference of other signals without local area network (LAN) less, therefore for fear of other signals are produced to larger interference, can suitably improve the standard that judges that whether channel is idle, reduce the reference quantity (above-mentioned predetermined threshold) that signal energy in channel is judged.Wherein, the first predetermined threshold and the second predetermined threshold can be set according to the residing real network environment of WLAN.In the time calculating other signals to the occupancy of channel, by calculating the duration of other signal busy channels and the ratio of the scheduled time in the given time, obtain the occupancy of other signals to channel, certainly, also can calculate and receive in the given time the duration of message busy channel and the ratio of the scheduled time, obtain receiving the occupancy of message to channel; And calculate send in the given time the duration of message busy channel and the ratio of the scheduled time, obtain sending the occupancy of message to channel; Similarly, calculate the busy duration of channel and the ratio of the scheduled time in the given time, obtain the total occupancy of channel, deduct and receive message to the occupancy of channel and send the occupancy of message to channel by the total occupancy of channel afterwards, obtain the occupancy of other signals to channel.
In technique scheme, preferably, according to the Duration/ID field of the each message receiving, determine that described each message takies the duration of described channel within the described scheduled time; The duration that all messages that receive is taken to described channel within the described scheduled time adds up, and takies the duration of described channel to obtain receiving message within the described scheduled time.
In this technical scheme, because the Duration/ID field of message represents the duration of message busy channel and at the duration that receives (piece) acknowledgement frame busy channel returning after message, therefore can determine by the Duration/ID field of message the duration of each message busy channel, and then calculating receives the shared channel duration of all messages; The duration of each message busy channel that similarly, the duration of transmission message busy channel also can send by statistics obtains.
In technique scheme, WLAN only, in the time judging described channel idle, just sends message to be sent to receiver side.
Fig. 4 shows according to an embodiment of the invention the schematic block diagram for the means for anti-jamming of WLAN (wireless local area network).
As shown in Figure 4, according to an embodiment of the invention for the means for anti-jamming 400 of WLAN (wireless local area network), comprise: detecting unit 402, receive the duration of message busy channel and send message the duration that takies described channel for detection of interactive unit 404 in the given time, and within the described scheduled time the busy duration of described channel; Processing unit 406, within the described scheduled time, take the duration of described channel for taking the duration of described channel and other signals of busy duration calculation of described channel according to the duration of described reception message busy channel, described transmission message, and within the described scheduled time, take the duration of described channel according to described other signals, adjust the strategy that judging unit 408 judges that whether described channel is idle, the ability of disturbing to strengthen described other signals of opposing; Described interactive unit 404, for sending message and receiving message; Described judging unit 408, whether idle for judging described channel.
In this technical scheme, by calculating the duration of other signals busy channel within the above-mentioned scheduled time, can determine that disturbed condition that WLAN is subject to other signals as wlan network (particularly, the duration of busy channel is longer, disturb larger), and then can be to judging channel whether adjust by idle strategy, with in the time that the interference that is subject to other signals is larger, can reduce the standard that judges that whether channel is idle, and then can reduce the time of waiting for channel idle, be conducive to the transmission of message, improve the throughput of downlink business.Wherein, other signals had both comprised WLAN signal, comprised again non-WLAN signal, had solved the problem that cannot process the interference of WLAN signal in correlation technique.Calculate other signals in the given time the duration of busy channel be to deduct the duration that receives the duration of message busy channel and send message busy channel and obtain by calculating the busy duration of channel.
In technique scheme, preferably, described detecting unit 402 is also for the signal energy that detects described channel; Described judging unit 408 specifically for: judge whether the signal energy in described channel is less than or equal to predetermined threshold, and signal energy in described channel is while being less than or equal to described predetermined threshold, judges described channel idle.
Whether in this technical scheme, the signal energy in channel is larger, illustrates that other signals are larger to the occupancy of channel, therefore can pass through the judgement to signal energy in channel, idle to determine channel.
In technique scheme, preferably, described processing unit 406 comprises: computing unit 4062, and the duration and the described scheduled time that within the described scheduled time, take described channel according to described other signals are calculated the occupancy of described other signals to described channel; Adjustment unit 4064, in the time that described occupancy is more than or equal to the first predetermined value, increases described predetermined threshold; And in the time that described occupancy is less than or equal to the second predetermined value, reduce described predetermined threshold.
In this technical scheme, specifically, in the time that other signals are larger to the occupancy of channel, illustrate that WLAN is subject to the interference of other signals larger, therefore in order to strengthen the antijamming capability of WLAN, the time of channel idle is waited in reduction, can reduce the standard that judges that whether channel is idle, increases the reference quantity (above-mentioned predetermined threshold) that signal energy in channel is judged; And at other signals to the occupancy of channel hour, illustrate that wireless to be subject to the interference of other signals without local area network (LAN) less, therefore for fear of other signals are produced to larger interference, can suitably improve the standard that judges that whether channel is idle, reduce the reference quantity (above-mentioned predetermined threshold) that signal energy in channel is judged.Wherein, the first predetermined threshold and the second predetermined threshold can be set according to the residing real network environment of WLAN.In the time calculating other signals to the occupancy of channel, by calculating the duration of other signal busy channels and the ratio of the scheduled time in the given time, obtain the occupancy of other signals to channel, certainly, also can calculate and receive in the given time the duration of message busy channel and the ratio of the scheduled time, obtain receiving the occupancy of message to channel; And calculate send in the given time the duration of message busy channel and the ratio of the scheduled time, obtain sending the occupancy of message to channel; Similarly, calculate the busy duration of channel and the ratio of the scheduled time in the given time, obtain the total occupancy of channel, deduct and receive message to the occupancy of channel and send the occupancy of message to channel by the total occupancy of channel afterwards, obtain the occupancy of other signals to channel.
In technique scheme, preferably, described detecting unit 402 specifically for: according to the Duration/ID field of the each message receiving, determine that described each message takies the duration of described channel within the described scheduled time; The duration that all messages that receive is taken to described channel within the described scheduled time adds up, and takies the duration of described channel to obtain receiving message within the described scheduled time.
In this technical scheme, because the Duration/ID field of message represents the duration of message busy channel and at the duration that receives (piece) acknowledgement frame busy channel returning after message, therefore can determine by the Duration/ID field of message the duration of each message busy channel, and then calculating receives the shared channel duration of all messages; The duration of each message busy channel that similarly, the duration of transmission message busy channel also can send by statistics obtains.
In technique scheme, preferably, described interactive unit 404 specifically for: in the time that described judging unit 408 is judged described channel idle, send message to be sent to receiver side.
Below in conjunction with Fig. 5 to Fig. 6, taking wlan network as example describes in detail technical scheme of the present invention.
Fig. 5 shows the structural representation of the transmitting system for WLAN (wireless local area network) according to an embodiment of the invention; Fig. 6 shows the structural representation for the means for anti-jamming of the system shown in Fig. 5.
As shown in Figure 5, transmitting system for WLAN (wireless local area network) according to an embodiment of the invention, comprising: processing unit 502 (can be cpu system), WLAN driver element 504, media access control chip 506 (being WLAN MAC chip) and radio frequency unit 508.Particularly, in the time that processing unit 502 need to send message to receiving device 510 by WLAN, first message to be sent is transferred to WLAN driver element 504, by WLAN driver element 504, message is carried out to encapsulation process, to obtain MPDU (MAC Protocol Data Unit, Medium Access Control (MAC) Protocol Data Unit), afterwards MPDU is sent in media access control chip 506 and processed, and be sent to receiving device 510 by radio frequency unit 508.
As shown in Figure 6, for the means for anti-jamming of the system shown in Fig. 5, wherein, the media access control chip 506 shown in Fig. 5 comprises this means for anti-jamming, and this means for anti-jamming comprises:
CCA thresholding arranges module 602, receives channel seizure ratio detection module 604 and the channel seizure ratio hardware detecting module 606 of message.
Wherein, CCA thresholding arranges module 602 and includes a timer, after the timing of timer reaches, CCA thresholding arranges module 602 and obtains the reception channel seizure ratio detection module 604 of message and the result of channel seizure ratio hardware detecting module 606, so that CCA threshold value is arranged.
Receive the channel seizure ratio detection module 604 of message, receive the take duration of message to channel for detection of the system shown in Fig. 5.Particularly, owing to there being Duration/ID field in 802.11 headings, represent the channel duration that this message takies, and the required channel duration taking of transmission (piece) acknowledgement frame, therefore, the channel seizure ratio detection module 604 that receives message adds up the Duration of all messages that receive, to obtain receiving the time of message busy channel.When CCA thresholding arranges module 602 after the timing of timer arrives, while getting from receiving the channel seizure ratio detection module 604 of message the time that receives message busy channel, using the time that receives message busy channel divided by the timing of timer as the channel seizure ratio that receives message.
Channel seizure ratio hardware detecting module 606 sends the duration of the shared channel of message for detect the system shown in channel total busy duration and Fig. 5 in the timing of timer.CCA thresholding arrange module 602 using busy duration total channel divided by the timing of timer as the total occupancy of channel, and using the duration that sends the shared channel of message divided by the timing of timer as the channel seizure ratio that sends message.And then CCA thresholding arranges the following formula of module 602 basis:
The channel seizure ratio of channel seizure ratio-reception message of the total occupancy-transmission message of channel;
Calculate the channel seizure ratio of other signals in the timing of timer, wherein, other signals had both comprised WLAN signal, comprised again WLAN signal.
Calculating after the channel seizure ratio of other signals, CCA thresholding arranges module 602 in the time that the channel seizure ratio of judging other signals exceedes first default threshold value, promote CCA threshold value, with in the time that the interference of other signals is larger, reduce the standard that judges that whether channel is idle, promote CCA threshold value; At the channel seizure ratio of judging other signals during lower than second default threshold value, reduce CCA threshold value, with the interference at other signals hour, for fear of other signals are produced to larger interference, can suitably improve the standard that judges that whether channel is idle, reduce CCA threshold value.
By the technical scheme in above-described embodiment, can detect the interference of other WLAN signals and non-WLAN signal simultaneously, thereby CCA threshold value is set more accurately, and then in the time that the interference that is subject to other WLAN signals and non-WLAN signal is larger, can shorten the time of waiting for channel idle, be beneficial to the transmission of message, thereby improve the throughput of downlink business.
More than be described with reference to the accompanying drawings technical scheme of the present invention, consider that the Anti jamming Scheme proposing in correlation technique only can reduce the interference of non-WLAN signal to a certain extent, and can not reduce the interference of WLAN signal, cause system to wait as long for channel idle, message is difficult to send, and the throughput of downlink business is low.Therefore, the present invention proposes a kind of new Anti jamming Scheme for WLAN (wireless local area network), can reduce the interference of the every other signal except current wireless local area network (LAN), and then reduce the time of waiting for channel idle, be conducive to improve the throughput of downlink business.
The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, for a person skilled in the art, the present invention can have various modifications and variations.Within the spirit and principles in the present invention all, any amendment of doing, be equal to replacement, improvement etc., within all should being included in protection scope of the present invention.
Claims (10)
1. for an anti-interference method for WLAN (wireless local area network), it is characterized in that, comprising:
Detect to receive in the given time the duration of message busy channel and send message and take the duration of described channel, and within the described scheduled time the busy duration of described channel;
Take the duration of described channel and other signals of busy duration calculation of described channel and take the duration of described channel within the described scheduled time according to the duration of described reception message busy channel, described transmission message;
Within the described scheduled time, take the duration of described channel according to described other signals, adjust the strategy that judges that whether described channel is idle, the ability of disturbing to strengthen described other signals of opposing.
2. the anti-interference method for WLAN (wireless local area network) according to claim 1, is characterized in that, judges whether idle strategy comprises described channel:
Detect the signal energy in described channel;
Judge whether the signal energy in described channel is less than or equal to predetermined threshold, and
When signal energy in definite described channel is less than or equal to described predetermined threshold, judge described channel idle.
3. the anti-interference method for WLAN (wireless local area network) according to claim 2, is characterized in that, takies the duration of described channel according to described other signals within the described scheduled time, adjusts and judges whether idle tactful step is specially described channel:
The duration and the described scheduled time that within the described scheduled time, take described channel according to described other signals are calculated the occupancy of described other signals to described channel;
In the time that described occupancy is more than or equal to the first predetermined value, increase described predetermined threshold; And
In the time that described occupancy is less than or equal to the second predetermined value, reduce described predetermined threshold.
4. the anti-interference method for WLAN (wireless local area network) according to claim 1, is characterized in that,
According to the Duration/ID field of the each message receiving, determine that described each message takies the duration of described channel within the described scheduled time;
The duration that all messages that receive is taken to described channel within the described scheduled time adds up, and takies the duration of described channel to obtain receiving message within the described scheduled time.
5. according to the anti-interference method for WLAN (wireless local area network) described in any one in claim 1 to 4, it is characterized in that, in the time judging described channel idle, send message to be sent to receiver side.
6. for a means for anti-jamming for WLAN (wireless local area network), it is characterized in that, comprising:
Detecting unit, receives the duration of message busy channel and sends message the duration that takies described channel for detection of interactive unit in the given time, and within the described scheduled time the busy duration of described channel;
Processing unit takies the duration of described channel within the described scheduled time for taking the duration of described channel and other signals of busy duration calculation of described channel according to the duration of described reception message busy channel, described transmission message, and
Within the described scheduled time, take the duration of described channel according to described other signals, adjust the strategy that judging unit judges that whether described channel is idle, the ability of disturbing to strengthen described other signals of opposing;
Described interactive unit, for sending message and receiving message;
Described judging unit, whether idle for judging described channel.
7. the means for anti-jamming for WLAN (wireless local area network) according to claim 6, is characterized in that, described detecting unit is also for the signal energy that detects described channel;
Described judging unit specifically for:
Judge whether the signal energy in described channel is less than or equal to predetermined threshold, and
When signal energy in described channel is less than or equal to described predetermined threshold, judge described channel idle.
8. the means for anti-jamming for WLAN (wireless local area network) according to claim 7, is characterized in that, described processing unit comprises:
Computing unit, the duration and the described scheduled time that within the described scheduled time, take described channel according to described other signals are calculated the occupancy of described other signals to described channel;
Adjustment unit, in the time that described occupancy is more than or equal to the first predetermined value, increases described predetermined threshold; And
In the time that described occupancy is less than or equal to the second predetermined value, reduce described predetermined threshold.
9. the means for anti-jamming for WLAN (wireless local area network) according to claim 6, is characterized in that, described detecting unit specifically for:
According to the Duration/ID field of the each message receiving, determine that described each message takies the duration of described channel within the described scheduled time;
The duration that all messages that receive is taken to described channel within the described scheduled time adds up, and takies the duration of described channel to obtain receiving message within the described scheduled time.
10. according to the means for anti-jamming for WLAN (wireless local area network) described in any one in claim 6 to 9, it is characterized in that, described interactive unit specifically for:
In the time that described judging unit is judged described channel idle, send message to be sent to receiver side.
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