CN101640929A - Anti-interference method of wireless mesh network on the basis of power control - Google Patents
Anti-interference method of wireless mesh network on the basis of power control Download PDFInfo
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- CN101640929A CN101640929A CN200910056683A CN200910056683A CN101640929A CN 101640929 A CN101640929 A CN 101640929A CN 200910056683 A CN200910056683 A CN 200910056683A CN 200910056683 A CN200910056683 A CN 200910056683A CN 101640929 A CN101640929 A CN 101640929A
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Abstract
The invention discloses an anti-interference method of wireless mesh network on the basis of power control, belonging to the technical field of network. The method comprises: sending a detection packet; calculating packet loss rate; calculating minimum normal communication transmission signal power and storing as a transmission power information table; and according to the minimum normal communication transmission signal power, sending a data packet. The invention reduces single signal covering range to increase concurrent signal amount in the whole wireless network space at the same time. With the method, interference appearing ratio in the wireless mesh network can be greatly reduced to finally improve the whole throughput property of the network.
Description
Technical field
What the present invention relates to is a kind of method of networking technology area, specifically is a kind of anti-interference method of wireless mesh network based on power control.
Background technology
Wireless mesh network is a kind of technology very widely of using in fields such as wireless access, municipal administration, disaster relief, security monitoring, industrial management, logistics cooperation.It has self-organizing, recover certainly, adaptive performance requirement, need be strong in mobility, channel is than stable access is provided under the rugged environment, so wireless mesh network must be looked after stability of network on the one hand, guarantee the unimpeded of data communication, must reduce on the other hand and disturb, improve the throughput and the availability of network.Therefore the anti-interference method of efficiently and accurately, high stability is the basis that makes up practical wireless mesh network, reduce disturb in the channel width of utilizing as much as possible, be the key of dealing with problems.
Wireless mesh network is the development of wireless ad hoc network, wireless ad hoc network is not owing to carry out effective optimization aspect flow, thereby can't reach the requirement of Access Network, it focuses on connective and the self-organization, and this has also caused the practical application of adhoc network in wireless network architecture less relatively.And wireless mesh network will just must solve the problem of adhoc network on flow as Access Network.In order to reduce the interference on the channel, 802.11 the wireless network of system has adopted comparatively pessimistic interference prediction method, make channel flow be far smaller than the flow upper limit that channel may exist, the patent that this paper is related, be exactly by control to transmitting power, reduce and disturb the possibility that takes place, improve the actual bandwidth of channel with this.
Find that by prior art documents number of patent application is that 200610011686 patent " multicenter radio dynamic distributed network information collision prevention communication method " also is a kind of anti-interference method of using in wireless network.The method that this patent is set forth has been considered the problem that the wireless network distributed nature is produced, and by the communication set that to make up with interim bunch of head be the center, by interim bunch of head control and the arrangement group in communication sequence, the interference problem in the solution group.Its technical characterstic is, choosing several Active Networks nodes according to certain mode in wireless network becomes interim bunch of head, with interim bunch be the center construction communication set, by communicating by letter in interim bunch of first control and the arrangement group.This method has adopted carries out central controlled among a small circle thinking with distributed network, has well solved the interference problem in the provisional communication group.By initiatively becoming the network node of interim bunch of head, efficiently the space channel of the wireless network in zone is managed and distributed.But this method for routing is based on the pattern of centralized management, and at first this just can't embody the network complex changeable characteristics, can cause the decline of network efficiency.Simultaneously, based on interim group anti-tampering mechanism, can't the reply group between the interference that produces of signal post, system can't carry out self adaptation at network condition, finally can cause system disorders.And the mechanism that initiatively becomes bunch head is too simple, can't make appropriate reaction to the complexity of actual application environment.
Summary of the invention
The present invention is directed to the prior art above shortcomings, a kind of anti-interference method of wireless mesh network based on power control is provided, by measure arbitrary network node under each power its neighbor node to the packet loss of its packet, determine the minimum proper communication transmit signal power of this each neighbor node of network node, reduce the coverage of individual signals with this, increase the quantity of subsequent signal in the interior whole wireless network space of same time, by this method, can greatly reduce the throughput performance that the probability that disturbs appearance in the wireless mesh network finally promotes network integral body.
The present invention is achieved by the following technical solutions, the present invention includes following steps:
Arbitrary network node of the first step, wireless mesh network inside sends the detection packet of different capacity value with the transmission frequency of setting, this network node is accepted the detection packet from other all-network node transmissions simultaneously, and the transmission network node of this detection packet correspondence is labeled as neighbor node, network node writes down the neighbor node of all these network nodes by neighbor table.
Described transmission frequency is meant: the number that sends detection packet in a detect cycle.
Described detection packet is a data frame structure, and this detection packet comprises: send the network node numbering of network node, the network node types that sends network node, transmission delay, transmission frequency, quantity forwarded, power rank, send the received packet loss from the detection packet of neighbor node of network node.
Described neighbor node is meant two network nodes that can communicate with each other in wireless channel.Concerning arbitrary network node,, all be its neighbor node with the network node that this network node is connected by data packet transmission.
Described neighbor table comprises: the transmitting power detection information of neighbor node and this neighbor node correspondence.
Described transmitting power detection information is meant the Information Statistics of the detection packet of each neighbor node.
Second step, network node calculate the packet loss of detection packet according to the detection packet number of detection packet that takes place in the time interval of setting and the corresponding neighbor node of receiving, simultaneously this packet loss are upgraded in the detection packet that this network node sent in the next time interval.
Described packet loss is meant: in the unit interval, in the detection packet that neighbor node sends, there be not the ratio of detection packet in the detection packet total amount successfully sent to, promptly the detection packet according to neighbor node sends interval information, acquisition neighbor node in the unit interval sends the sum of detection packet, sum is deducted the quantity of receiving the neighbor node detection packet, and its difference is packet loss divided by the detection packet sum.
The 3rd step, network node are calculated the minimum proper communication transmit signal power that obtains this network node and corresponding each neighbor node according to the detection packet of the neighbor node received and from carrying of sending of each neighbor node detection packet that the present networks node sends, and the minimum proper communication transmit signal power of all neighbor node correspondences is stored as the transmission power information table.
Described minimum proper communication transmit signal power is meant this network node and a certain specific neighbor node, is guaranteeing that the packet loss parameter is lower than under the situation of fixed threshold, the transmitting power of required minimum, and described fixed threshold is 5%.
The 4th step, when network node need carry out data communication, at first judge neighbor node according to routing table; Then according to the transmission power information table with the transmission power setting of wireless network card for this reason neighbor node minimum proper communication transmit signal power and send this packet, the packet that receives when network node produces when disturbing, the network node delay random time, prevent the lasting generation of disturbing.
Described random time is meant: by a random time gap of random number generator generation, this random time gap is used to guarantee that two nodes that clash can not carry out transfer of data once more after the identical time interval, thereby causes producing again the phase mutual interference.
The present invention can reduce the probability that the mutual interference of wireless signal phase occurs in the wireless network to greatest extent, is very suitable for using under the electromagnetic wave conditions complicated situation of present this space.
Description of drawings
Fig. 1 is the detection packet broadcasting schematic diagram of the embodiment of the invention.
Fig. 2 is the concurrent communication schematic diagram of the embodiment of the invention.
Embodiment
Below embodiments of the invention are elaborated, present embodiment is being to implement under the prerequisite with the technical solution of the present invention, provided detailed execution mode and concrete operating process, but protection scope of the present invention is not limited to following embodiment.
As shown in Figure 1, detection packet BROADCASTING GRAPH for present embodiment, wherein: each network node all can peripherad neighbor node with other detection packet of different power stages, arbitrary network node all will obtain the transmission power information data of neighbours for the present networks node by the detection packet packet loss that writes down under its neighbor node different capacity, and this information is placed on return neighbor node in the detection packet.Because detection packet constantly sends reception, the transmit power data storehouse of each network node is also in continuous adjustment.
When upgrading the transmit power data storehouse in real time, each network node all can obtain its minimum proper communication transmit signal power of its each neighbor node relatively, promptly ensures under the prerequisite of proper communication operable minimum power.This power will become network node and send data to the employed power of this neighbor node, reduce the wireless signal coverage of communication this time to greatest extent.
As shown in Figure 2, concurrent communication figure for present embodiment, wherein: when network node need send the data that arrive particular network node, network node is by judging the minimum proper communication transmit signal power that arrives particular network node, signal launched gone out, meanwhile, two network nodes that are adjacent are also communicated by letter, owing to transmit signal power is enough little, therefore produce interference between two pairs of communications mutually.
A floor with office building is an example, supposes to be furnished with 30 network in wireless mesh network nodes altogether at whole floor.Need increase the total throughout of wireless network as much as possible, but will guarantee that simultaneously the wireless network of All Ranges covers.Therefore 30 network nodes roughly are placed in 20 rooms of floor.
Present embodiment specifically may further comprise the steps:
At first after each network node is opened, they can be in per 5 second time, respectively 5 different power ranks, send 50 detection packet (these parameters can according to the actual conditions adjustment), accept the detection packet that other network nodes send simultaneously, and the transmission network node of received detection packet is labeled as neighbours.At this moment, the network in wireless mesh network node around each the network in wireless mesh network node in the floor can both be found, and they can be denoted as neighbours.
Then,, can obtain the transmit power data of the relative present networks node of its neighbor node, and generate the transmit power data storehouse according to other 10 ratios that detection packet is received of each grade.Simultaneously, in the detection packet after the information in the transmit power data storehouse will be placed in, real-time releases.To help its neighbor node to upgrade minimum proper communication transmit signal power.
Afterwards, according to the situation of the received neighbours' detection packet of present networks node, the detection packet that the present networks node that obtains sends is at the situation of neighbor node, i.e. the transmit power data database data of neighbor node.Afterwards, according to the content of data, upgrade the minimum proper communication transmit signal power of present networks node at this neighbor node.These steps are constantly repeating, and each network node will be safeguarded the transmit power data storehouse between a local network node and the neighbor node dynamically, and it is sent.The minimum proper communication transmit signal power of each network node of renewal that the data meeting of real-time update is real-time.
At last, when carrying out transfer of data, the purpose network node that network node sends according to data is selected to carry out the data transmission at these neighbours' minimum proper communication transmit signal power.Because wireless mesh network system is a kind of multihop self-organizing network, therefore when transmission, select nearer network node to carry out the normal operation that data forwarding still can guarantee network service.Simultaneously, lower signal power has effectively reduced the interference territory scope of wireless signal, makes that the concurrent communication quantity that can hold in the network greatly increases in the same time, has reached to prevent to disturb in the wireless mesh network effect that takes place.
Present embodiment can solve the problem of disturbing the wireless mesh network performance utilance deficiency of bringing, makes network reach optimum on overall performance.
Claims (8)
1, a kind of anti-interference method of wireless mesh network based on power control is characterized in that, may further comprise the steps:
Arbitrary network node of the first step, wireless mesh network inside sends the detection packet of different capacity value with the transmission frequency of setting, this network node is accepted the detection packet from other all-network node transmissions simultaneously, and the transmission network node of this detection packet correspondence is labeled as neighbor node, network node writes down the neighbor node of all these network nodes by neighbor table;
Second step, network node calculate the packet loss of detection packet according to the detection packet number of detection packet that takes place in the time interval of setting and the corresponding neighbor node of receiving, simultaneously this packet loss are upgraded in the detection packet that this network node sent in the next time interval;
The 3rd step, network node are calculated the minimum proper communication transmit signal power that obtains this network node and corresponding each neighbor node according to the detection packet of the neighbor node received and from carrying of sending of each neighbor node detection packet that the present networks node sends, and the minimum proper communication transmit signal power of all neighbor node correspondences is stored as the transmission power information table;
The 4th step, when network node need carry out data communication, at first judge neighbor node according to routing table; Then according to the transmission power information table with the transmission power setting of wireless network card for this reason neighbor node minimum proper communication transmit signal power and send this packet, the packet that receives when network node produces when disturbing, the network node delay random time, prevent the lasting generation of disturbing.
2, the anti-interference method of wireless mesh network based on power control according to claim 1 is characterized in that the transmission frequency described in the first step is meant: the number that sends detection packet in a detect cycle.
3, the anti-interference method of wireless mesh network based on power control according to claim 1, it is characterized in that, detection packet described in the first step is a data frame structure, and this detection packet comprises: send the network node numbering of network node, the network node types that sends network node, transmission delay, transmission frequency, quantity forwarded, power rank, send network node received packet loss and packet loss from the detection packet of neighbor node.
4, the anti-interference method of wireless mesh network based on power control according to claim 1 is characterized in that the neighbor node described in the first step is meant two network nodes that can communicate with each other in wireless channel.Concerning arbitrary network node, all it can receive the network node of packet, all be its neighbor node.
5, the anti-interference method of wireless mesh network based on power control according to claim 1 is characterized in that the neighbor table described in the first step comprises: the transmitting power detection information of neighbor node and this neighbor node correspondence.
6, the anti-interference method of wireless mesh network based on power control according to claim 1, it is characterized in that, packet loss described in second step is meant: in the unit interval, in the detection packet that neighbor node sends, do not have the ratio of detection packet in the detection packet total amount of successfully sending to.
7, the anti-interference method of wireless mesh network based on power control according to claim 1, it is characterized in that, minimum proper communication transmit signal power described in the 3rd step is meant this network node and a certain specific neighbor node, guaranteeing that the packet loss parameter is lower than under the situation of fixed threshold, the transmitting power of required minimum, described fixed threshold are 5%.
8, the anti-interference method of wireless mesh network based on power control according to claim 1, it is characterized in that, random time described in the 4th step is meant: by a random time gap of random number generator generation, this chance event gap is used to guarantee that two nodes that clash can not carry out transfer of data once more after the identical time, thereby causes producing again the phase mutual interference.
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103052148A (en) * | 2011-10-13 | 2013-04-17 | 联发科技股份有限公司 | communications apparatus and control method of multiple levels of transmission power |
| CN103686610A (en) * | 2013-11-30 | 2014-03-26 | 北京智谷睿拓技术服务有限公司 | Broadcast method and broadcast equipment for wireless communication |
| CN103763764A (en) * | 2013-12-10 | 2014-04-30 | 银江股份有限公司 | Data transmission method for electric transmission line wireless communication based on automatic power increasing retransmission mechanism |
| CN107994957A (en) * | 2017-12-04 | 2018-05-04 | 武汉微智创大科技有限公司 | A kind of Wireless Communication Equipment signal small range covering method |
| CN108024258A (en) * | 2017-12-04 | 2018-05-11 | 武汉微智创大科技有限公司 | A kind of Wireless Communication Equipment small-signal spreads network-building method |
| CN108207021A (en) * | 2016-12-20 | 2018-06-26 | 华为技术有限公司 | Transmission power control method, equipment and wireless controller |
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2009
- 2009-08-20 CN CN200910056683A patent/CN101640929A/en active Pending
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103052148A (en) * | 2011-10-13 | 2013-04-17 | 联发科技股份有限公司 | communications apparatus and control method of multiple levels of transmission power |
| US9288774B2 (en) | 2011-10-13 | 2016-03-15 | Mediatek Inc. | Communications apparatuses and method for multi-level transmission power control thereof |
| CN103686610A (en) * | 2013-11-30 | 2014-03-26 | 北京智谷睿拓技术服务有限公司 | Broadcast method and broadcast equipment for wireless communication |
| CN103763764A (en) * | 2013-12-10 | 2014-04-30 | 银江股份有限公司 | Data transmission method for electric transmission line wireless communication based on automatic power increasing retransmission mechanism |
| CN103763764B (en) * | 2013-12-10 | 2017-01-11 | 银江股份有限公司 | Data transmission method for electric transmission line wireless communication based on automatic power increasing retransmission mechanism |
| CN108207021A (en) * | 2016-12-20 | 2018-06-26 | 华为技术有限公司 | Transmission power control method, equipment and wireless controller |
| CN108207021B (en) * | 2016-12-20 | 2020-11-06 | 华为技术有限公司 | Transmission power control method, device and wireless controller |
| CN107994957A (en) * | 2017-12-04 | 2018-05-04 | 武汉微智创大科技有限公司 | A kind of Wireless Communication Equipment signal small range covering method |
| CN108024258A (en) * | 2017-12-04 | 2018-05-11 | 武汉微智创大科技有限公司 | A kind of Wireless Communication Equipment small-signal spreads network-building method |
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