IEEE 802.11e EDCA中虚拟碰撞问题的一种解决策略

A Solution for Virtual Collision in IEEE 802. 11e EDCA

IEEE 802.11e标准中的EDCA机制引入了虚拟碰撞的概念,从而带来了基站内相同优先级业务相对优先权不同的问题。为解决这一问题,现提出一种新的N-EDCA(NEW-EDCA)调节机制,该机制将发生过与未发生过虚拟碰撞的队列一视同仁,从而避免了优先级倒置和不公平的问题。该机制中保持了虚拟碰撞队列的原竞争参数,仿真结果验证了N-EDCA机制的有效性。

EDCA mechanism in IEEE 802.11e introduced the concept of virtual collision,resulting in different priority issues for the same priority business within a base station.In order to solve this problem,a new N-EDCA adjustment mechanism is proposed.The queues in the mechanism are equal,whether the virtual collision occurs to them or not,thus avoiding priority inversion and non-equity.This mechanism maintains original queue competition parameters in virtual collision.The simulation results demonstrate the effectiveness of N-EDCA mechanism.