CN101567754A - Speed self-adaption method based on wireless Mesh network - Google Patents
Speed self-adaption method based on wireless Mesh network Download PDFInfo
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Abstract
The invention relates to a speed self-adaption method based on wireless Mesh network in the technical field of wireless network, which comprises the steps of externally broadcasting a probe packet to each wireless Mesh network node and simultaneously receiving the probe packets transmitted by the neighboring nodes thereof, timely maintaining a preferential speed list according to the successful rate of transmitting the probe packet, building a new dynamic probe array according to the preferential speed list and the local nodes, selectively transmitting all the probes which are provided with the speeds listed in the preferential speed list and the probes with approximate speeds, and realizing the self-adaption of speed selection according to the judgment on the successful rate of transmitting the probe. The speed self-adaption method based on wireless Mesh network in the technical field of wireless network can better adapt to the change of network state, can reduce the effect of routing broadcast and convergence on the throughput to the largest extent, simultaneously considers the change of network topology and is very suitable to be used under the situations with complex space electromagnetic waves.
Description
Technical field
The present invention relates to the method in a kind of radio network technique field, particularly a kind of speed self-adaption method based on wireless Mesh netword.
Background technology
Wireless Mesh netword (based on wireless mesh network) is also referred to as " multi-hop (multi-hop) " network, and it is a kind of and the diverse novel radio network technology of conventional wireless network.In traditional wireless lan (wlan), each client all visits network by a Radio Link that links to each other with AP (access point), the user must at first visit a fixing AP if intercom mutually, and this network configuration is called as single-hop networks.And in wireless Mesh netword, any wireless device node can be simultaneously as AP and router, and each node in the network can send and received signal, and each node can carry out direct communication with one or more peer node.
Adaptive rate selection method core be the channel information that becomes when obtaining (Channel StateInformation, CSI).Based on the wireless Mesh netword of IEEE 802.11 standards, currently mainly contain two kinds of methods of obtaining CSI: the method that channel information is directly measured and based on the method for statistical information.
The method that channel information is directly measured is a certain information of direct measured channel, as signal to noise ratio (snr), received signal intensity (RSS) or the error rate (BER), thereby can react channel status apace.For example in the RBAR agreement (WLAN (wireless local area network) rate adaptation MAC agreement) that G.Hol-land proposes, the SNR of the RTS that recipient's measurement receives (request sends) frame, choose suitable speed, give transmit leg by CTS (clear to send) frame with the rate selection feedback information again.The shortcoming of this method is: accurately obtain SNR and be not easy, and this agreement uses RTS/CTS to shake hands forcibly, must bring extra expense.In addition, the RBAR agreement need be made amendment to IEEE 802.11 standards, thereby is not adopted by manufacturer at present.
Method based on statistical information is statistics sends data in a period of time some information, successfully receives number of times, throughput etc. as the foundation of judging quality of wireless channel as frame error rate, ACK (acknowledge character).The significant advantage of this method is simple and convenient, can realize by writing driver.
Find through literature search prior art, Duan Zhongxing, Zhang Deyun is in " the rate adaptation algorithm of multi-rate WLAN " (the 33rd 8 phases of volume of " computer engineering " April in 2007, article numbering: proposed a kind of wireless network speed self-adaption method in 1000-3428 (2007)-08-0033-03) literary composition, the maintenance data integration technology, utilize fuzzy logic that each parameter is carried out reasoning and judging by real-time detection and estimation, form the part judgement of single parameter channel quality to RSS, CIR and 3 parameters of PER.Through the compose operation of fusion center and the global decision that decision rule obtains channel quality, carry out the selection of best transmission rate with this.This technology is primarily aimed at the higher hardware platform of hardware performance, and only will follow the 802.11b standard, and the flank speed that is suitable for is 11Mbps.
Summary of the invention
The objective of the invention is to overcome the deficiencies in the prior art, a kind of speed self-adaption method based on wireless Mesh netword is provided, solve the problem of single channel rate adaptation difference in the complicated wireless Mesh netword topological environmental.Among the present invention each wireless Mesh netword node is outwards broadcasted the probe bag and receive the probe bag that its neighbor node sends simultaneously, safeguard a preferential speed tabulation according to the success rate of giving out a contract for a project of probe bag to all adjacent nodes, by introducing periodically probe in detecting mechanism and dynamic probe queue mechanism, guaranteed that the probe success rate of giving out a contract for a project reacts link circuit condition really, simultaneously not only realized rate adaptation, and can revise testing mechanism thereupon in good time based on throughput statistics information according to the variation of link circuit condition.When optimizing routing mechanism, realized rate adaptation with minimum overhead.
The present invention is achieved by the following technical solutions, comprises the steps:
The first step, netinit begins, each Wireless Mesh node is loaded a probe formation that comprises all 802.11 traffic rates of supporting, and periodically send the probe bag according to certain time interval, accept the probe bag that other nodes send simultaneously, and the sending node of received probe bag is labeled as the neighbor node of recipient node.
Described probe bag is a kind of like this broadcast data packet, it comprises the physical messages such as node serial number, node type, node signal to noise ratio of this node, has comprised the acceptance rate of the received neighbor node probe bag of the set information of this section point probe bag and this node simultaneously.
The set information of described probe bag comprises transmission delay, transmission interval, the quantity forwarded of this node all types probe in probe bag sense cycle of this probe.So the probe bag not only can be as the existence of Hello bag statement oneself, also can be as the data basis of link maintenance, can also make simultaneously each node know that the probe of own transmission wraps in the acceptance rate of other nodes, make the understanding link quality information that each node can both be two-way.According to the probe bag, system will safeguard that a neighbor table represents all neighbor nodes, and send and accept statistical information for each neighbour sets up the relevant probe bag that a detecting probe information table promptly writes down each neighbor node.
Described probe bag sense cycle is meant that predefined statistics sends the time period length of the data message of probe bag.This setting will send with the probe bag, so that neighbor node can be in the time span of this setting, by the statistics to the probe bag quantity that received, obtain the packet loss of probe newspaper.This packet loss will be recorded in the detecting probe information table, simultaneously will by along with after the probe bag send.
Second step, according to receiving that the probe bag number of the different rates of neighbor node calculates probe pack receiving and transmitting success rate in the transmission frequency of employed probe bag in the first step and the unit sense cycle, the link quality information in the unit sense cycle that will be obtained by the probe bag be placed in the probe bag that sends this locality and send simultaneously.
The 3rd step, the information of other adjacent nodes in the probe bag of receiving according to local node, and the information of entrained local node in institute's receipts probe bag, calculate the statistical form of a local node, as the initial foundation of adaptation rate selection to all the adjacent node different rates probe bag packet receiving success rates and the success rate of giving out a contract for a project.
The 4th step, the optimal rate the when statistical form that generates according to the 3rd step, local node can be selected and carry out transfer of data with all adjacent nodes, and charge to preferential Speedometer Drive.Finish to this netinit process.
Described preferential Speedometer Drive is meant local node according to result of detection, from the 3rd step select the described statistical form to different adjacent nodes communication the time employed optimal rate tabulation.
Described optimal rate, i.e. traffic rate between selected adjacent node in the initialization procedure.
The 5th step, preferential Speedometer Drive according to the generation of the 4th step, local node is set up one new dynamic probe formation, selectivity sends all to be had and lists the probe of speed and the approaching probe of speed with it in the preferential Speedometer Drive, be in the formation of initialization probe than the probe of preferential high one-level of Speedometer Drive middle probe rate value and low one-level, and continue periodically to send the minimum speed limit probe on this basis.This moment network ingress rate adaptive process, preferential Speedometer Drive and dynamic probe formation will no longer be subjected to the influence of initialization procedure, then according to each the speed probe transmitting-receiving situation in the current dynamic probe formation and change.Thereby the number of probes in the dynamic spy formation is significantly reduced, shortened the hairpin cycle of probe formation, thereby improve the timeliness of statistical form, make preferential Speedometer Drive react current channel quality more accurately.
Described dynamic probe formation, be meant at present rate and select and the probe formation of replacement, be specially: this formation has been removed and the bigger probe of current traffic rate numerical difference between distance in good time, keep the speed probe of the current traffic rate variation of adaptation and the adjacent probe of this speed targetedly, keep the minimum speed limit probe simultaneously in order to the maintenance information transmission, and steady rate probe is in order to guarantee to meet the minimum requirements of wideband transmit standard.
The 6th step, network topology change and extraneous wireless signal disturbed condition under, the network service bandwidth can change, thereby cause the transmitting-receiving success rate of probe to change, when the network service bandwidth reduces to cause the hairpin success rate of the probe of certain speed in the preferential Speedometer Drive to be lower than pre-set threshold value A, this speed probe will be replaced by adjacent with it low first-rate in the preferential Speedometer Drive, the network service bandwidth increase cause in the dynamic probe formation with preferential Speedometer Drive in the hairpin success rate of the adjacent higher first-rate probe of the probe of certain optimal rate when being higher than pre-set threshold value B, optimal rate corresponding in original preferential Speedometer Drive will be replaced by this higher one-level probe speed.When if preferential speed rises to 54Mbps, the dynamic probe formation selects three kinds of probes of flank speed to send; When if preferential speed drops to 1Mbps, the dynamic probe formation selects three kinds of probes of minimum speed limit to send.
Described threshold values is meant the default thresholding that triggers preferential rate variation.When the hairpin success rate of existing preferential speed probe is lower than threshold values A, or the hairpin success rate of the higher one-level probe that compares is higher than threshold values B, and preferential Speedometer Drive will change thereupon.According to a large amount of emulation and actual environment test, the scope of threshold values A is 75% to 85%, and the scope of threshold values B is 85% to 95%.
The 7th step, when preferential Speedometer Drive changes, feed back to the dynamic probe formation, the dynamic probe formation repeated for the 5th step according to up-to-date preferential Speedometer Drive, the 6th step, to guarantee that current probe transmit queue that the dynamic probe formation sets meets the monitoring requirements of current adaptation rate, promptly when guaranteeing to detect current use traffic rate, adjacent high stage speed and low stage speed are surveyed, at any time guarantee that current traffic rate switches to low stage speed when unavailable, or when higher stage speed can with the time switch to high stage speed, to reach the adaptive purpose of dynamic rate.
Compared with prior art, the present invention has following beneficial effect: the present invention taken into account initiatively route record and passive route discovery advantage the basis on, effectively utilize route probe mechanism to solve the rate adaptation problem.In wireless Mesh netword, the relative fixed of outlet and the dynamic characteristic of link itself, make the present invention can be good at adapting to the variation of the state of network, can accomplish to reduce to greatest extent routing broadcast and the influence of convergence to throughput, simultaneously the variation of network topology is taken into account, be highly suitable under the electromagnetic wave conditions complicated situation of space and use.Network resource consumption of the present invention is low, more be applicable to the lower embedded platform of relative PC platform hardware performance, and follow the standard of 802.11a/b/g, can adapt to 512kbps existing all wireless network speed to 54Mbps, make adaptation rate in real time and select, have higher availability and reliability.
Description of drawings
Fig. 1 is that the embodiment of the invention is implemented rate adaptation variation schematic diagram under topology variation situation.
Embodiment
Below in conjunction with accompanying drawing 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.
Present embodiment is an example with one five layers show room, as shown in Figure 1, every layer is divided into two exhibition rooms of thing, one deck and five layers of each exhibition room are placed 1 node and are respectively: ' eastern 1a ', ' western 1a ', ' eastern 5a ', ' western 5a ', three layers of eastern exhibition room space are bigger, therefore place ' eastern 3a ', ' 2 nodes of eastern 3b ', three layers of western exhibition room are placed ' two layers of western 3a ', four layers, because the bearing wall structure is arranged in the middle of the exhibition room, therefore also place 2 nodes and be respectively for every layer: ' eastern 2a ', ' eastern 2b ', ' western 2a ', ' western 2b ', ' eastern 4a ', ' eastern 4b ', ' western 4a ', ' western 4b ', 15 nodes altogether, ' eastern 3a ' wherein, ' eastern 5a ', ' western 4a ', ' western 1a ' is a gateway node.
Present embodiment comprises the steps:
The first step, netinit begins, connect the power supply of each mesh node, each Wireless Mesh node is loaded a probe formation that comprises all 802.11 traffic rates of supporting, and periodically send the probe bag according to certain time interval, accept the probe bag that other nodes send simultaneously, in the present embodiment as the check node ' eastern 3b ' (other nodes ' behaviors are identical with it) can be in the first step process discovery ' eastern 4b ', ' eastern 2b ', ' eastern 3a ' is the adjacent node of oneself to gateway;
Second step, according to receiving that the probe bag number of the different rates of neighbor node calculates probe pack receiving and transmitting success rate in the transmission frequency of employed probe bag in the first step and the unit sense cycle, the link quality information in the unit sense cycle that will be obtained by the probe bag be placed in the probe bag that sends this locality and send simultaneously.' transmitting-receiving of probe between eastern 3b ' basis and adjacent node under local record and the transmitting-receiving packet success rate of all adjacent node different rates probes, and writes subsequent probes to this information to detection node, and broadcasting is gone out.Simultaneously according to ' eastern 3a ', ' eastern 2b ', ' probe that eastern 4b ' sends, learn the existence of other nodes in the network, as ' western 2b ', as shown in table 1, therefore and nonneighbor node though ' eastern 3b ' can receive ' probe of the 2Mbit/s of western 2b ', the two there is no direct one and jumps communication;
The 3rd step, the information of other adjacent nodes in the probe bag of receiving according to local node, and the information of entrained local node in institute's receipts probe bag, calculate the statistical form of a local node, as the initial foundation of adaptation rate selection to all the adjacent node different rates probe bag packet receiving success rates and the success rate of giving out a contract for a project.' eastern 3b ' basis and the transmitting-receiving of the probe between adjacent node are on every side added up the transmitting-receiving packet success rate of various speed probes and are calculated optimal rate;
The 4th step, as shown in table 1 according to the statistical form that the 3rd step generated, the optimal rate when local node can be selected and carry out transfer of data with all adjacent nodes, and charge to preferential Speedometer Drive.Finish to this netinit process.In the present embodiment optimal rate be ' eastern 3b ' in initialization procedure, determine and adjacent node ' eastern 3a ', ' eastern 2b ', ' eastern 4b ' and ' western 2b's ' is (same as above, ' western 2b ' is not ' eastern 3b ' an adjacent node, therefore the two can directly not carry out data communication with the speed of 2Mbit/s, but can according to route by ' eastern 3a ' carries out multi-hop communication) traffic rate;
The 5th step, preferential Speedometer Drive according to the generation of the 4th step, local node is set up one new dynamic probe formation, and selectivity sends all to be had and list the probe of speed and the approaching probe of speed with it in the preferential Speedometer Drive, and continues periodically to send the minimum speed limit probe on this basis.' write down and ' eastern 4b ' in the preferential Speedometer Drive of eastern 3b ' in the present embodiment, ' the preferential speed of communication is respectively 36Mbit/s and 54Mbit/s between eastern 3a ', therefore in the dynamic probe formation with it rate corresponding be 24Mbit/s, 36Mbit/s, 48Mbit/s, the probe of 54Mbit/s also has the minimum speed limit probe of 1Mbit/s, network ingress rate adaptive process in the dynamic probe formation simultaneously;
The 6th step, when the three layers of exhibition room in east need local devices adjustment or scene to arrange, ' eastern 3b ' moves temporarily in requirement, ' mobile the causing of eastern 3b ' position ' eastern 3b ' is to ' eastern 2a ' and ' western 2b ' is close, simultaneously away from ' eastern 4b ' network topology this moment changes, ' eastern 3b ' and adjacent ' eastern 3a ' node, ' eastern 2a ' node, ' eastern 4b ' node and and non-conterminous ' probe transmitting-receiving packet success rate between the western 2b ' node is owing to the change of physical distance changes, ' eastern 3b ' with ' eastern 2a ' and ' the priority communication speed concrete numerical value that rises is as shown in table 1 between western 2b ': ' eastern 3b ' are with ' eastern 4b ' the preferential speed of communicating by letter descends, ' eastern 3b ' is with ' eastern 3a ' probe transmitting-receiving situation also has slight change, but do not reach threshold values, so traffic rate can not change.Threshold values A is 85 in this example, and threshold values B is 95.
Actual measurement shows, in the network between each adjacent node according to method provided by the invention, the selection optimal rate communicates, guarantee the stability of whole network service to greatest extent, can not take place under the single-rate situation again, because link-quality descends, and can't reach the situation that original traffic rate causes communication disruption.
The hairpin success rate changes and preferential rate variation table in the table 1 present embodiment sense cycle
The 7th step is when ' eastern 3b ' retracts original position, repeats for the 5th step, and the 6th step with each node communication speed in good time adjustment took place once more, and is as shown in table 1.
This example has effectively solved because change in topology causes the situation that the wireless Mesh netword communication quality descends even opens circuit under the single-rate situation, and the overall performance that makes network especially stability significantly improves.
Claims (6)
1. the speed self-adaption method based on wireless Mesh netword is characterized in that, comprises the steps:
The first step, each Wireless Mesh node is loaded a probe formation that comprises all 802.11 traffic rates of supporting, and periodically send the probe bag according to certain time interval, accept the probe bag that other nodes send simultaneously, and the sending node of received probe bag is labeled as the neighbor node of recipient node;
Second step, according to receiving that the probe bag number of the different rates of neighbor node calculates probe pack receiving and transmitting success rate in the transmission frequency of employed probe bag in the first step and the unit sense cycle, the link quality information in the unit sense cycle that will be obtained by the probe bag be placed in the probe bag that sends this locality and send simultaneously;
The 3rd step, the information of other adjacent nodes in the probe bag of receiving according to local node, and the information of entrained local node in institute's receipts probe bag, calculate the statistical form of a local node, as the initial foundation of adaptation rate selection to all the adjacent node different rates probe bag packet receiving success rates and the success rate of giving out a contract for a project;
The 4th step, the optimal rate the when statistical form that generates according to the 3rd step, local node can be selected and carry out transfer of data with all adjacent nodes, and charge to preferential Speedometer Drive;
In the 5th step, according to the preferential Speedometer Drive that the 4th step generated, local node is set up one new dynamic probe formation, and selectivity sends all to be had and list the probe of speed and the approaching probe of speed with it in the preferential Speedometer Drive;
The 6th step, when the hairpin success rate of the probe of certain speed in the preferential Speedometer Drive is lower than 75%～85%, this speed probe will be replaced by adjacent with it low first-rate in the preferential Speedometer Drive, when in the dynamic probe formation with preferential Speedometer Drive in the hairpin success rate of the adjacent higher first-rate probe of the probe of certain optimal rate when being higher than 85%～95%, preferential speed corresponding in original preferential Speedometer Drive will be replaced by this higher one-level probe speed; When if preferential speed rises to 54Mbps, the dynamic probe formation selects three kinds of probes of flank speed to send; When if preferential speed drops to 1Mbps, the dynamic probe formation selects three kinds of probes of minimum speed limit to send;
The 7th step when preferential Speedometer Drive changes, fed back to the dynamic probe formation, and the dynamic probe formation repeats the 5th step, the 6th step according to up-to-date preferential Speedometer Drive.
2. the speed self-adaption method based on wireless Mesh netword according to claim 1, it is characterized in that, described probe bag is a broadcast data packet, the node serial number, node type, the node signal to noise ratio that comprise this node, the transmission delay of this section point probe, send at interval, the quantity forwarded of this node all types probe in probe bag sense cycle and the acceptance rate of the received neighbor node probe bag of this node.
3. the speed self-adaption method based on wireless Mesh netword according to claim 1 and 2 is characterized in that, the sense cycle of described probe bag is meant that statistics sends the time period length of the number of probe bag.
4. the speed self-adaption method based on wireless Mesh netword according to claim 1 is characterized in that, described preferential Speedometer Drive is meant employed optimal rate tabulation when local node is communicated by letter to different adjacent nodes according to result of detection.
5. the speed self-adaption method based on wireless Mesh netword according to claim 1 is characterized in that, described optimal rate is the traffic rate between selected adjacent node in the initialization procedure.
6. the speed self-adaption method based on wireless Mesh netword according to claim 1, it is characterized in that, described dynamic probe formation, be meant and removed and the bigger probe of current traffic rate numerical difference between distance, keep the speed probe that adapts to current traffic rate and change, the adjacent probe and the minimum speed limit probe of this speed.
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