An efficient multiple access coordination scheme for OFDMA WLAN

Abstract

A new hybrid multiple access coordination scheme (HMAC) that increases channel utilization for orthogonal frequency-division multiple access wireless local area network is presented. This scheme is based on a mixture of centralized access control and distributed random access to maximize channel utilization. Remarkably, HMAC allows two schemes to function at the same time, not alternatively. Performance evaluation results show notable improvement on channel utilization, which is mainly based on the efficient way how we handle uplink traffic.