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Distributed media access method used in wireless local area network

A wireless local area network and media access technology, applied in wireless communication, network topology, electrical components, etc., can solve the problems of cumbersome and troublesome operation, achieve the effects of expanding the scope of application, easy development and implementation, and improving system performance

Active Publication Date: 2012-08-01
上海润欣科技股份有限公司
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Problems solved by technology

[0011] The above method of reducing the collision probability between users by adjusting the value range of CW needs to increase the site’s monitoring function of network load (as described in the first document), or make major changes to the existing standard protocol ( As described in the second document), the operation is troublesome and cumbersome

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  • Distributed media access method used in wireless local area network
  • Distributed media access method used in wireless local area network
  • Distributed media access method used in wireless local area network

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Embodiment Construction

[0028] In order to make the purpose, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and the simulation results of the embodiments.

[0029] The improved distributed media access method used in the wireless local area network of the present invention is based on the media access method based on the distributed coordination function DCF stipulated in the existing standard, and uses randomization to set the duration of the DCF inter-frame interval DIFS (specifically The method is: on the basis of the set duration of DIFS stipulated in the protocol, add a random duration ΔDIFS; and in order not to increase too much channel overhead, it is recommended to set the duration of ΔDIFS as ΔDIFS=random(0, Slot_time), where, Slot_time is the time slot length set by the standard protocol), to prevent different users from entering the random backoff window waiting...

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Abstract

The invention discloses a distributed media access method used in a wireless local area network. According to the method, on the basis of a distributed coordination function (DCF)-based media access method specified in the conventional standard, the time length of DCF inter-frame space (DIFS) is set by randomizing: namely, a random time length deltaDIFS is added on the basis of the set time length of the DIFS specified in a protocol; moreover, in order not to add excessive channel overhead, the time length deltaDIFS is recommended to be set within a set time slot length, namely, delta DIFS=random (0, Slot_time); the time length of the DIFS is used for avoiding a phenomenon that different users synchronously enter a random backoff window wait state because of selecting contention windows (CWs) with the same time length, so that data collision probability and retransmission numbers among different users are reduced; channel utilization rate is improved; and system throughput is increased. Because only the time length of the DIFS is modified (namely the time length of the DIFS is subjected to randomization processing), the method is simple in operation and easy to develop, cannot increase system complexity, and does not need to update conventional sites; and new sites are compatible with old sites mutually, so that the application range of the method is enlarged, and the method has very good popularization and application prospect.

Description

technical field [0001] The invention relates to an improved distributed media access method for a wireless local area network, belonging to the technical field of wireless communication networks. Background technique [0002] In recent years, with the rapid growth of wireless communication demands, the WLAN (Wireless Local Area Network) technology has attracted more and more attention. The Institute of Electrical and Electronics Engineers IEEE (The Institute of Electrical and Electronics Engineers) has formulated the 802.11 series of technical standards for wireless local area networks, which defines the contention-based distributed coordination function DCF for the medium access control layer MAC (Medium Access Control) (Distributed Coordination Function). DCF adopts the CSMA / CA (Carrier Sense Multiple Access / Collision Avoidance) protocol based on the collision avoidance mechanism, and the access user independently selects the access channel according to the monitored chan...

Claims

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Application Information

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IPC IPC(8): H04W74/08H04W84/12
Inventor 李勇孙建军靳浩彭木根王文博
Owner 上海润欣科技股份有限公司
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