86 / 2017-03-10 23:08:03

An Efficient Contention-based Initial Access Optimization for Wireless Network Protocol

9374,13070,13071,13072

With the rapid development of WLAN, a surge in the number of network users and high-speed data exchange highlight the importance of efficient initial access of MAC layer. Generally, the wireless systems exploit contention-free or contention-based random access protocols for initial access, the latter having wider application. This paper proposes an optimized initial access of MAC layer based on CSMA/CA, optimizing the backoff time calculation algorithm and the partition of Contention Window. A novel parameter named Collision Probability Factor is introduced to calculate the backoff time auxiliary based on channel state. Moreover, we propose a novel initial access procedure to ensure the timely transmission of high priority data. Simulation results show the effectiveness of proposed optimized approach. The normalized throughput and success rate are significantly improved especially in dense scenarios. And the number of collisions decreases evidently.