Contention Based Uplink Orthogonal Frequency-Division Multiple Access (OFDMA)

摘要

A method of performing contention-based uplink OFDMA transmission is proposed in accordance with one novel aspect. A wireless communications station (an AP) reserves both dedicated resource and contention resource for uplink OFDMA operation for a list of communications devices (STAs). For contention-based random access, the AP does not need to collect traffic requests from the STAs. The AP only needs to make simple resource arrangement. The AP only needs to specify the allocated resource for random access and the uplink OFDMA operation duration and timing for each uplink OFDMA packet. Each STA having traffic request will contend the resource based on a random access probability scheme.

主权项

1. A method for random access, comprising:
(a) generating a first random number to determine a probability to contend for random access in a wideband wireless communications network using uplink orthogonal frequency division multiple access (OFDMA) by a wireless communications device; (b) receiving a first frame specifying a second allocated number of resource units (RUs) for random access, wherein the first frame carries timing and duration information of the random access RUs; (c) determining whether the device is allowed to contend for random access based on the first random number upon receiving the first frame; (d) updating the first random number and increasing the probability to contend for random access if contention is not allowed, wherein the device waits for subsequent random access; and (e) selecting an RU in accordance with a predetermined rule and transmitting a second frame via the selected RU if contention is allowed, wherein the device re-generates the first random number for subsequent random access.