| 摘要 |
In an 802.11ax network with an access point, a trigger frame offers random resource units to nodes for data uplink communication to the access point. To dynamically adapt the contention mechanism used by the nodes to access the random resource units, the AP updates a correcting parameter at each new TXOP (Transmission Opportunity) and includes the updated adjusting parameter in the trigger frame for the next TXOP. The correcting parameter is a function of the number of unused random resource units and the number of collided random resource units. The nodes use the adjusting parameter to generate a local random parameter from the conventional 802.11 backoff value. Next, the nodes contend for access to the random resource units using the local random parameter. The dynamic adjustment of the contention mechanism allows utilisation of the available sub-channels while minimising collisions on these sub-channels. A second embodiment describes sending padding data on a random resource unit to maintain synchronisation. Use of the above methods are described within a WLAN operating very high throughput (VHT) by combining contiguous channels. |
