Control method and system for wireless channel access competition

Abstract

The invention discloses control method and system for wireless channel access competition. The computing method of the optimal contention window is provided on the basis of an IEEE802.11 standard, and the original back off algorithm of an MAC protocol is improved. The invention is firstly characterized by deeply analyzing the thruput and the delay performance of a wireless network, and provides the method for dynamically computing the optimal contention window in a real-time mode according to the number of active nodes in the wireless network. Moreover, the invention provides a new back off mode which comprises the following steps of firstly, computing the optimal contention window according to the number of the calculated active nodes in the network; secondly, adding a random seed algorithm; and when conflict occurs in the wireless channel, the back off algorithm is increased by a random value on the basis of the optimal contention window instead of doubling the original window. Therefore, the conflict of channel competition by each active node is avoided, the access delay of media is also shortened, and the thruput and the utilization rate of the wireless network are both improved.

Description

technical field [0001] The invention mainly relates to the field of wireless network communication, in particular to a control method and device for wireless channel access competition. Background technique [0002] In the first decade of the 21st century, the communication industry is at a turning point. The 20th century could be called the "Cable Century," with millions of companies running copper and fiber optic cables in and over homes, office buildings, streets, and even under the ocean. The 21st century is rapidly becoming the "wireless century". Unlike the previous century, the motivation for using wireless technology is no longer voice, but data. This shift has been the driving force behind many different technologies for delivering unique services to users. As one of the mainstream wireless broadband access technologies, wireless local area network has achieved success and rapid development due to its wide applicability and technical price advantages, especially ...

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Problems solved by technology

[0011] In this way, we will find that when the backoff window is doubled, the collision probability will be reduced, but the backoff time will also be increased.

Especially when the contention window is increased to the maximum value of the window, the backoff time will increase greatly

On the other hand, the default value of the standard contention window is fixed at 31, instead of dynamically optimizing the contention window according to the wireless network environment, so that the wireless network throughput and delay performance cannot be optimal

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