Distributive competition control of withdraw of radio local network

Abstract

First the method checks channel, and then uses the checked stop numbers of retreat-register and the initialized retreat time slot number to get the initial estimate value. After the initial estimate value of capacity factor of time slot is made smoothing processing, the probability of outgoing data frame is obtained. Then the transmission action of current data frame of node is adjectively adjusted according to transmission probability. Finally the competing window after transmission is selected according to if it is transmitted or if it hits to data of other node.

Description

technical field [0001] The invention relates to the technical field of communication, in particular to a distributed contention control backoff method of a wireless local area network. Background technique [0002] At present, because wireless local area network does not need any fixed wiring structure, wireless local area network has been widely used in the environment where the public communication network is underdeveloped, such as university campuses, hospitals, airports, large supermarkets, etc., which are not suitable for wiring. However, as the number of WLAN users increases, the load on the network becomes heavier and heavier. How to use limited bandwidth resources to improve the utilization of WLAN has become a technical problem to be solved urgently in the development of WLAN. [0003] At present, the access protocols that can be applied to WLAN include: AOB (Asymptotically Optimal Backoff) method that dynamically adjusts the transmission probability based on the p...

AI Technical Summary

Problems solved by technology

However, due to the popularity of WLAN and the flexible network layout of WLAN, the number of users who choose WLAN as the access network has increased exponentially in recent years, and the network has become more and more busy. overload state

When the network enters a congested state, the binary exponential backoff method has two defects: one is to increase the size of the contention window at the cost of the collision of data packets sent by nodes; The application register records the current congestion level of the network, and then uses the network congestion level information to reasonably set the competition window of the node

However, because after each successful transmission, the backoff competition window is simply set to half of the contention window at the time of successful transmission, and the current competition situation of the network is not estimated in real time during the backoff process before each data frame is sent , to plan the sending action of the current frame

Therefore, when the network is in a high-load state, this method cannot guarantee the successful access of the current frame. On the contrary, blindly waiting for the end of the backoff to send the data frame to the wireless channel will only lead to further deterioration of the wireless network communication environment.

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