Priority Collision Resolution - Distributed Coordination Function for Distributed Wireless Networks

In distributed wireless access networks, the short-term unfairness of IEEE 802.11 Distributed Coordination Function (DCF) has been revealed by many works. In this paper, a modified DCF, based on the principle of Priority Collision Resolution (PCR), is proposed to improve the short-term fairness in distributed access wireless networks. The authors' PCR-DCF achieves short-term fairness improvement without estimating behaviors of other users and the system contention level, such as the number of active users. Only the capability to identify collision is required. Theoretical analysis is carried out to validate the performance of PCR-DCF based on a slotted system model.