CN102215535B - Key information insurance method for WLAN (Wireless Local Area Network) - Google Patents
Key information insurance method for WLAN (Wireless Local Area Network) Download PDFInfo
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- CN102215535B CN102215535B CN 201110146076 CN201110146076A CN102215535B CN 102215535 B CN102215535 B CN 102215535B CN 201110146076 CN201110146076 CN 201110146076 CN 201110146076 A CN201110146076 A CN 201110146076A CN 102215535 B CN102215535 B CN 102215535B
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Abstract
The invention discloses a key information insurance method for a WLAN (Wireless Local Area Network). The method comprises the following steps that: a network layer inquires if the network is congested before sending key information to an MAC (Media Access Control) layer; if the network is congested, the network layer sequentially sends the key information cue primitive corresponding to the key information and the key information to the MAC layer; the MAC layer marks the key information from the network layer as a key frame; and the MAC layer starts a key information insurance mechanism for the key frame in the process of sending competitive opportunities. According to the invention, the success rate of the key information, such as route request information or route response information transmitted in the network can be obviously improved.
Description
Technical field
The invention belongs to wireless communication technology field, be specifically related to a kind of WLAN (wireless local area network) key message support method.
Background technology
WLAN (wireless local area network) based on the IEEE802.11 agreement is very widely wireless network of a kind of application, and wherein the MAC layer Channel Access Mechanism of regulation mainly adopts the channel competition method of avoiding based on the carrier sense multiple access interference.A node at first needed to send " request sends " sign and comes competitive channel before sending packet to other nodes, destination node is replied " allowing to send " sign to connect after receiving " request sends " sign, sending node sends packet again, after receiving node is received packet, reply again " confirming to receive " message, finish once complete data exchange process by above " 4-Way Handshake " process.Although this mechanism has systematically ensured the data interaction between network node, but in the heavier real world applications environment of network congestion, more data collision occurs during its comparatively complicated implementation procedure will cause transmitting, significantly reduced data and successfully transmitted probability.
The AODV agreement is a kind of common network layer Routing Protocol, and its feature is that mechanism realizes simple, and system complexity is low, uses comparatively extensive.Yet also there are problems in the AODV Routing Protocol, greatly affects this agreement effect in actual applications.For example, when network congestion increases the weight of, MAC layer end-to-end communication collision rate increases, when success rate descends, the Route establishment of AODV and maintenance process are as easy as rolling off a log to be affected, so that Route establishment failure, and after the Route establishment process is obstructed, it starts route again, and to rebulid time interval of process relatively long again.The AODV agreement is not considered countermeasure in this case, causing more, high level data can not sent rapidly owing to there is available route after arriving network layer, after network layer is piled up, can only overtimely abandon, greatly affected the service quality of communication system.In addition, in this case, because in the data flow of practical communication, the failure in competition of the mac frame that is carrying the network layer routing iinformation relatively seldom, causing a large amount of other to be derived from more high-rise general data can not participate in the at random access contention mechanism of DCF mechanism regulation owing to there is route, can only abandon equally, this will cause the deterioration of system's fairness.
Therefore, be to improve the competition success rate of Route establishment and maintenance information, guarantee that the MAC layer data is bundled into the fairness of merit transmission probability and total system, it is necessary that existing MAC layer competition mechanism and network layer Route establishment maintenance mechanism are united improvement.
Summary of the invention
The object of the invention is to, on based on 802.11 DCF manufacturing basis, provide a kind of adjustable MAC layer access scheme of priority of competing, to guarantee some important information, such as route requests and routing reply information, the success rate of competitive channel.
The invention provides following technical scheme:
A kind of WLAN (wireless local area network) key message support method said method comprising the steps of:
Network layer is before being sent to the MAC layer with key message, and whether requester network is congested;
If network congestion, then network layer sends this key message corresponding key message prompting primitive and this key message to the MAC layer successively;
The MAC layer in the future key message of automatic network layer is labeled as key frame;
The MAC layer starts the key message security mechanism to key frame in the send opportunity competition process.
Preferably, described key message is routing information request or routing reply information.
Preferably, whether described network is congested is regularly added up, judges and reported to network layer with the primitive form by the MAC layer.
Preferably, whether the congested process of regularly being added up, being judged by the MAC layer comprises described network:
MAC layer data buffer queue average length in the statistics scheduled time sends data bulk and sends the data success rate;
Described statistics and the predefined criterion of each node M AC layer are compared, draw whether congested judgement of network.
Preferably, described MAC layer in the future the key message of the automatic network layer process that is labeled as key frame comprise:
Article one network layer data that the MAC layer will follow closely after the key message prompting primitive is confirmed as key message;
The MAC layer carries out mark to the ad-hoc location of the frame structure of the Frame that comprises described key message.
Preferably, described key frame is started the key message security mechanism in the send opportunity competition process process comprises:
The MAC layer extracts a Frame from the data buffer storage formation;
Judge whether network is congested;
If network congestion then further judges whether described Frame is key frame;
If so, then need opening network layer key message security mechanism.
Preferably, described key message security mechanism is adjusted minimum competition window length and interFrameGap, sends priority to improve key frame.
WLAN (wireless local area network) key message support method can significantly improve for example success rate transmitted of routing information request or routing reply information of key message in network, in the heavier transmitting scene of traffic load, the time that network layer is set up available route can obviously be shortened, further improve MAC layer data transmission speed, avoid because there not being available route to cause data stacking consequently to abandon at the MAC layer.This method has obviously been improved the unfair situation of the Internet Transmission that does not freely cause alternately because of routing iinformation simultaneously.
Description of drawings
Fig. 1 is the WLAN (wireless local area network) key message support method flow chart according to the embodiment of the invention;
Fig. 2 is the flow chart that key frame is started the key message security mechanism in the send opportunity competition process according to the MAC layer of the embodiment of the invention;
Fig. 3 is the congested statistics of MAC layer network and the interaction diagrams according to the embodiment of the invention;
Fig. 4 is the network layer handles flow chart according to the node of the transmission routing information request of the embodiment of the invention;
Fig. 5 is the network layer handles flow chart according to the node of the transmission routing reply information of the embodiment of the invention or forwarding routing information request;
Fig. 6 is the network layer handles flow chart according to the node of the forwarding routing reply information of the embodiment of the invention.
Embodiment
The present invention is further elaborated below in conjunction with the drawings and specific embodiments.
Fig. 1 is the WLAN (wireless local area network) key message support method flow chart according to the embodiment of the invention.Embodiment is launched in network layer and MAC layer.Before network layer generation key message sent to the MAC layer, at first whether requester network was congested, if network is not congested, then this key message normally sent by the MAC layer.If network congestion utilizes the primitives interoperation mechanism between network layer and the MAC layer, send " key message prompting " primitive to the MAC layer in advance, pay the MAC layer, be about to arrive with the announcement key message, so that carrying out to process, prepares on the MAC layer.Network layer send " key message prompting " primitive corresponding to this key message to the MAC layer after, and then send this key message.After receiving " key message prompting " primitive that network layer sends, the MAC layer is prepared to receive key message, and article one network layer data that will follow closely after " key message prompting " primitive is confirmed as the network layer key message.Afterwards, the MAC layer is labeled as key frame with this key message, its method is, the QoS of frame head position that will comprise the Frame of described key message ensure the 8 positions of part be labeled as 1(according in IEEE 802.11 agreements to the description of mac layer frame structure, this position is for keeping the position, for agreement improver later use).Afterwards, the MAC layer starts the key message security mechanism to key frame in the send opportunity competition process.Network whether congested monitoring mechanism realized by the MAC layer, and the MAC layer adds up regularly, judges that network is whether congested and report to network layer, makes network layer when whether the needs requester network is congested, the result who receives before can calling.
Fig. 2 is the flow chart that key frame is started the key message security mechanism in the send opportunity competition process according to the MAC layer of the embodiment of the invention.The MAC layer key frame of mark is placed in the MAC layer data buffer queue.Frame in the MAC layer data buffer queue is followed the processing rule of first in first out.Whenever the MAC layer need to extract a Frame from the data buffer storage formation, when beginning its send opportunity competition process, at first judge according to the network congestion information of MAC layer storage, if network is not congested, then this Frame is used normal transmission flow; If whether network congestion judges further then whether current data frame is once marked, be key frame namely, if not, then still normally send; If, then need open the key message security mechanism, utilize the mode of adjusting minimum competition window length and interFrameGap, send priority to improve key frame, increase this frame and in current communication process, compete the success rate of send opportunity, make it to send smoothly as early as possible.InterFrameGap is in the random competition access mechanism, in order to the time interval of the subprocess of cutting apart the transmission of dissimilar frames in a complete transmission course.The adjustment of these two values will effectively act on the contention access process, reach the purpose of adjusting particular frame access success rate and access speed.
Fig. 3 is the congested statistics of MAC layer network and the interaction diagrams according to the embodiment of the invention.The statistics of network congestion, judgement, as a result generation work are finished by the MAC layer, and the MAC layer is regularly informed network layer with this result by the form of primitive.The MAC layer preset one regular time the interval, the selection of this time interval length need to consider concrete network of network message volume pace of change and overhead.The judgement of network congestion is a combined process, because network condition is complicated, can not just make estimation simply by virtue of a certain parameter, but some parameters that can embody network congestion to be carried out Conjoint Analysis, those skilled in the art can select suitable parameter to carry out the judgement of network congestion according to network condition.For example the present invention sends data bulk and sends the data success rate and analyze, to hold the traffic carrying capacity of each inter-node communication in the network preferably to MAC layer data buffer queue average length.The criterion of storing in the every data that will collect afterwards and each the node M AC layer compares, draw the judgement to network congestion, and this result regularly informed network layer by the form of primitive, make network layer when needs are judged network congestion, can call the information that receives before obtaining.
When key message is routing information request or routing reply information, the embodiment of network layer such as Fig. 4, Fig. 5 and shown in Figure 6:
Fig. 4 is the network layer handles flow chart according to the node of the transmission routing information request of the embodiment of the invention.When the more high-rise data that need to send to the network layer transmission more than the network layer, network layer at first needs table of query and routing, to judge whether there has been available route in network layer.If existing available route, normal encapsulation of data then, and then carry out data according to existing route and transmit.If there is no available route then needs to start and sets up routing procedure.Setting up the route stage, the network congestion of MAC layer report if network is not congested, did not then need key message is ensured before network layer was at first inquired about, and therefore directly generated routing information request and consigned to the MAC layer; If network congestion then needs to generate " route requests prompting " primitive, pay the MAC layer, be about to arrive with the announcement routing information request, so that carrying out to process, prepares on the MAC layer.Network layer send " route requests prompting " primitive corresponding to this routing information request to the MAC layer after, and then send this routing information request.
Fig. 5 is the network layer handles flow chart according to the node of the transmission routing reply information of the embodiment of the invention or forwarding routing information request.Stipulate according to the AODV agreement, the routing information request that is produced and sent by a certain node in the network is when arriving another node, whether another node must be judged oneself has routing iinformation can reply this routing information request, if have then generate routing reply information and send, if not then continue to transmit the routing information request of origin node.Judge by congestion situation, no matter node is to determine to generate and send routing reply information, or continue to transmit routing information request, before MAC layer actual transfer information, all need network layer to judge network congestion is to determine whether need this key message is ensured.
Fig. 6 is the network layer handles flow chart according to the node of the forwarding routing reply information of the embodiment of the invention.Similarly, in the repeating process of routing reply information, each forward node confirms successively network congestion is to determine whether need this routing reply information is ensured.
Should be appreciated that and abovely by the preferred embodiments of the present invention technical scheme of the present invention is had been described in detail.Those of ordinary skill in the art is reading on the basis of specification of the present invention and can make amendment to the technical scheme that embodiment puts down in writing, and perhaps part technical characterictic wherein is equal to replacement; And these modifications or replacement do not make the essence of appropriate technical solution break away from the spirit and scope of various embodiments of the present invention technical scheme.Protection scope of the present invention is only limited by the claims of enclosing.
Claims (7)
1. a WLAN (wireless local area network) key message support method is characterized in that, said method comprising the steps of:
Network layer is before being sent to the MAC layer with key message, and whether requester network is congested;
If network congestion, then network layer sends this key message corresponding key message prompting primitive and this key message to the MAC layer successively;
The MAC layer in the future key message of automatic network layer is labeled as key frame;
The MAC layer starts to adjust minimum competition window length and interFrameGap as the key message security mechanism of method to key frame in the send opportunity competition process.
2. WLAN (wireless local area network) key message support method according to claim 1 is characterized in that, described key message is routing information request or routing reply information.
3. WLAN (wireless local area network) key message support method according to claim 1 is characterized in that, whether described network is congested is regularly added up, judges and reported to network layer with the primitive form by the MAC layer.
4. WLAN (wireless local area network) key message support method according to claim 3 is characterized in that, whether the congested process of regularly being added up, being judged by the MAC layer comprises described network:
MAC layer data buffer queue average length in the statistics scheduled time sends the quality of data and sends the data success rate;
Described statistics and the predefined criterion of each node M AC layer are compared, draw whether congested judgement of network.
5. WLAN (wireless local area network) key message support method according to claim 1 is characterized in that, the process that the key message of described MAC layer automatic network layer in future is labeled as key frame comprises:
Article one network layer data that the MAC layer will follow closely after the key message prompting primitive is confirmed as key message;
The MAC layer carries out mark to the ad-hoc location of the frame structure of the Frame that comprises described key message.
6. WLAN (wireless local area network) key message support method according to claim 1 is characterized in that, described key frame is started the key message security mechanism in the send opportunity competition process process comprises:
The MAC layer extracts a Frame from the data buffer storage formation;
Judge whether network is congested;
If network congestion then further judges whether described Frame is key frame;
If so, then need the opening network layer to adjust minimum competition window length and interFrameGap as the key message security mechanism of method.
7. WLAN (wireless local area network) key message support method according to claim 1 is characterized in that, described key message security mechanism is adjusted minimum competition window length and interFrameGap, sends priority to improve key frame.
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Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101146033A (en) * | 2007-10-31 | 2008-03-19 | 重庆邮电大学 | A method for improving radio Ad hoc performance based on layer-spanning collaborative mechanism |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101146033A (en) * | 2007-10-31 | 2008-03-19 | 重庆邮电大学 | A method for improving radio Ad hoc performance based on layer-spanning collaborative mechanism |
Non-Patent Citations (6)
| Title |
|---|
| IEEE802.11MAC协议中一种改进的退避解决算法;张海等;《广东通信技术》;20060730(第06期);全文 * |
| resource scheduling and congestion control for WMN;李旭;《Proceedings of ICCTA2009》;20091231;全文 * |
| 基于多Agent强化学习的Ad hoc网络跨层拥塞控制策略;邵飞等;《电子与信息学报》(第06期);全文 * |
| 张海等.IEEE802.11MAC协议中一种改进的退避解决算法.《广东通信技术》.2006,(第06期), |
| 李旭.resource scheduling and congestion control for WMN.《Proceedings of ICCTA2009》.2009, |
| 邵飞等.基于多Agent强化学习的Ad hoc网络跨层拥塞控制策略.《电子与信息学报》.(第06期), |
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