A wireless competition access control method based on congestion degree possibility P

Abstract

The utility model relates to a distributed contention control backoff method for wireless local network based on probability P, belonging to the wireless communication technology. The method is based on the basic idea of executing backoff on the basis of nodes; by executing carrier monitoring mechanism, the nodes estimate the network congestion status; the time slot utilization ration is calculated according to the time slot number when the channel is busy and the total time slot number passed in the backoff process, and the congestion degree probability P is thereby determined; a value of the contention window of the nodes is arranged according to the value of the probability P and the node random number; each time after the nodes is sent successfully, the probability P is used to judge whether the contention window is turned into the minimum value; therefore, unnecessary collision is avoided. When collision occurs in the channel, the value of the contention window is doubled until the maximum value is achieved; then the value of a backoff counter is determined according to the contention window, and the collision of the network data is thereby controlled. The utility model is based on the present IEEE802.11 standard protocol, and no other hardware requirement is needed; the utility model is in complete distribution mode; the throughput, the time delay and other functions of the utility model are all superior to the prior backoff methods.

Description

technical field [0001] The invention relates to the technical field of wireless network communication, in particular to a contention access control method of a wireless local area network. Background technique [0002] With the development of broadband wireless technology and the Internet, wireless local area network (WLAN) is widely used in underdeveloped public communication networks, such as university campuses, hospitals, airports, large supermarkets and other environments that are not suitable for wiring. However, with the increasing number of wireless local area network users, the network load is getting heavier and heavier. How to improve network utilization has become a key technical problem to be solved in the development of wireless local area network. [0003] Under the IEEE 802.11 DCF access mechanism, all nodes are competing for the shared wireless channel, and the collision increases with the increase of users, resulting in a decrease in network throughput perf...

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Problems solved by technology

[0007] The technical problem to be solved by the present invention is to design a dynamic backoff method P_PBA( P-Persistent Backoff Algorithm) to solve the high collision probability caused by the existing backoff method not recording the network congestion level in real time dynamically in the high load network, and the delay increases and the throughput performance of the wireless local area network increases under the high load state. The problem

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