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

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.