IMPROVED ALLOCATION OF UPLINK RESOURCES IN ORTHOGONAL FREQUENCY-DIVISION MULTIPLE ACCESS WIRELESS NETWORKS

摘要

A method of improved allocation of uplink resources in an ORTHOGONAL FREQUENCY-DIVISION MULTIPLE ACCESS (OFDMA) network is proposed. A wireless communications station (an access point (AP)) reserves both dedicated resource and contention resource for uplink OFDMA operation for a list of communications devices (STAs). The access point (AP) can switch between random access operation and non-random access operation without the need for any special protection mechanisms. In the event of an increase in uplink OFDMA frame collisions the access point (AP) can switch from random operation to non-random operation to reduce the number of collisions. In the event of a decrease in uplink OFDMA frame collisions the access point (AP) can switch from non-random operation to random operation to reduce required access point (AP) processing. The access point (AP) can also dynamically control a communication device (STA) access probability to reduce the number of collisions by reducing the number of uplink OFDMA frames each communication device (STA) transmits.