Date Added: Aug 2012
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.