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Exponential backspace method for radio local network

A wireless local area network, exponential technology, used in the use of return channels for error prevention/detection, digital transmission systems, data exchange through path configuration, etc. Effectiveness of utilization, improved network performance, and simplicity of execution

Inactive Publication Date: 2007-11-07
SOUTHEAST UNIV
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Problems solved by technology

[0005] Technical problem: In view of the poor flexibility of the existing exponential back-off method and the inability to flexibly change the contention window according to the current state of the network and node conditions, the present invention proposes a method for wireless local area networks based on the success probability of nodes sending data in the network Adaptive exponential back-off method, so that the wireless node only needs to make statistics on the data packet transmission, and then it can adaptively change the back-off window, improve the throughput of the network, and reduce the delay of data packets in the network

Method used

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  • Exponential backspace method for radio local network
  • Exponential backspace method for radio local network
  • Exponential backspace method for radio local network

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Embodiment Construction

[0026] The execution process of this method is:

[0027] 1. After the wireless LAN node is started, it is initialized first, and the parameters of the node are set, including the minimum value of the competition window CW min The maximum value (CW minl ) and minimum (CW minm ), the maximum value of the contention window (CW max ), the time between frames (T IFS ), slot time (T slot ), etc., and set the timer timing time, so that each node in the network after initialization calculates the success probability P of the node data packet transmission within the T time period every time T s (P s The initial value is set to 1).

[0028] 2. After initialization, the node enters the idle waiting state. If the node has data packets to send, it detects whether the channel is idle, and if the channel is idle continuously (T idle ) reaches the inter-frame interval time, the node calculates the minimum contention window for this transmission:

[0029] CW min =CW minl +(1-P s )(...

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Abstract

A method for backspacing index of radio local area network includes initializing node after node is started up, detecting whether channel is idle or not when there is data packet required to be sent by node, selecting initial counting value and carrying out backspace counting, sending out data packet when counting value on counter is zero, doubling current competition widow value of node and comparing doubled value with maximum competition window value to take minimum value as competition window value for being used to carry out resending, and entering node into idle waiting state when there is no data packet required to be sent by node.

Description

technical field [0001] The invention relates to an exponential fallback method applied to a wireless local area network, and belongs to the technical field of wireless communication and information dissemination. Background technique [0002] A wireless local area network is a local area network in which wireless devices share resources and exchange information through wireless channels, and its coverage range is generally tens to hundreds of meters. [0003] As an extension of the traditional wired network, WLAN can already replace the traditional wired network in some environments. Compared with the traditional wired network, the wireless local area network is more flexible, cheaper and easy to expand. Compared with the cellular network, it has wider bandwidth resources and higher transmission rate, and can realize the transmission of voice, image and video. At present, the wireless local area network and the existing cellular system constitute the next generation of mobi...

Claims

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Application Information

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IPC IPC(8): H04L12/28H04L1/16H04L1/00
Inventor 余旭涛张在琛
Owner SOUTHEAST UNIV
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