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Method for optimizing passing rate performance in wireless ad hoc network

A wireless self-organizing network, high-performance technology, applied in the field of communication, can solve problems such as low channel utilization and low network throughput

Inactive Publication Date: 2014-02-26
NORTHWESTERN POLYTECHNICAL UNIV
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  • Description
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Problems solved by technology

[0009] In order to overcome the shortcomings of low channel utilization or low network throughput in the prior art, the present invention provides a variable rate MAC based on an optimal backoff mechanism, that is, OV-MAC (Variable rate Media Access Control protocol with Optimal Backoff), for network Significantly improved pass rate

Method used

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  • Method for optimizing passing rate performance in wireless ad hoc network
  • Method for optimizing passing rate performance in wireless ad hoc network
  • Method for optimizing passing rate performance in wireless ad hoc network

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Embodiment Construction

[0068] Based on the variable rate MAC of the optimal backoff mechanism, after the receiving node successfully receives the RTS packet, the receiving node calculates the frame error rate of the eight rate modes of IEEE 802.11a according to the signal-to-noise ratio of the RTS packet, and selects the frame error rate of the data packet through the formula The optimal transmission rate, and according to the number of nodes waiting to send data in the network, calculate the minimum contention window for the next backoff after this successful transmission. The specific flow chart is as figure 2 Shown:

[0069] The principle of judging the number of nodes waiting to send data in the current network is: for sending node i, when listening to the data packet sent by sending node j, read the B in the data of node j j , modify the parameter k of the current state, and k represents the number of nodes waiting to send data in the network; (B j =1 indicates that node j still has data pac...

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Abstract

The invention discloses a method for optimizing passing rate performance in a wireless ad hoc network. By adopting the method, the following defects are overcome: the traditional IEEE802.11DCF (distributed coordination function) mechanism adopts the minimum contention window of the BEB (binary exponential backoff) algorithm, so the processing nodes are not timely enough to contend and are too passive. The method has the following beneficial effects: dynamically detecting the number of the transmitting nodes of the contention channels, then computing the next minimum contention window after the transmitting nodes successfully complete the current transmission according to the frame error rate of the RTS (request to send) packet, optimizing the backoff timeslot and reducing the average time of access of the nodes to the channels. The backoff mechanism is superior to the traditional BEB algorithm.

Description

technical field [0001] The invention relates to the technical field of communication, and relates to a method for optimizing the throughput performance of a variable-rate MAC based on an optimal backoff mechanism in a wireless self-organizing network. Background technique [0002] Variable rate MAC, that is, V-MAC (Variable rate Media Access Control protocol). The main idea of ​​the algorithm is that the sending node perceives the channel state according to the signal-to-noise ratio value, and dynamically changes the transmission mode of the data packet to improve the pass rate. The existing variable rate transmission methods are mainly divided into two categories: the first type is based on the variable rate algorithm at the receiving end, and the second type is based on the variable rate algorithm at the sending end. The variable rate algorithm based on the receiving end mainly adopts the RTS / CTS exchange mechanism. The receiving end decides which transmission mode to use...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L1/00H04L1/16H04W74/08
Inventor 李波戴瑞龙
Owner NORTHWESTERN POLYTECHNICAL UNIV
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