Advances in wireless communication technology have increased the demand for wireless networks. The IEEE 802.11 standard defines the specifications for Medium Access Control (MAC) and the physical layers in a wireless local area network. The IEEE 802.11 standard provides two mechanisms for the MAC protocol: the Point Coordination Function (PCF) and the Distributed Coordination Function (DCF). The PCF utilizes a basic access mechanism that supports contention-free services. Therefore, the PCF requires a base station that coordinates channel access among nodes. On the other hand, the DCF utilizes an access mechanism that supports contention-based services.