| 摘要 |
A method of sending data over a communication network is disclosed. A communication device accesses the network using a contention-type access mechanism based on computation of back-off values 311 for a plurality of access categories serving traffic queues at different priorities. Access category back-off values are computed based on the priority of the associated traffic queue. A synchronized back-off value 500 is computed and used to contend access to the network for transmitting data of one of the traffic queues. At least one of access category back-off values is adjusted 707 according to the synchronized back-off value. The adjustment may make the synchronized back-off value coincide with the value of at least one access category back-off value, preferably the one with the lowest back-off value. Instead, it may make the synchronized back-off value lower than a minimum back-off value. The adjustment may apply an offset value to at least one access category back-off value, the offset value being preferably the difference between the value of the lowest back-off value and the current synchronized value. The synchronized back-off value may be computed using a deterministic method, which may comprise messaging and/or pseudo-random generation, in accordance with the values of other devices in the network. |
