| 摘要 |
<p>In widely deployed wireless "hot-spot" networks, nodes frequently join or leave, inelastic/elastic and saturated/non-satuarted flows coexist. In such dynamic and diverse environments, it is challenging to maximize the channel utilization while 5 providing satisfactory user experiences. In this invention, one proposes a novel contention-on-demand (CoD) MAC scheme to address this problem. The CoD scheme consists of a fixed-CW algorithm, a dynamic-CW algorithm, and an admission control unit. The fixed-CW algorithm allows elastic flows to access limited system bandwidth; the dynamic-CW algorithm enables inelastic flows to 10 contend for channel on demand and quickly adapt to network change; and the admission control unit rejects overloaded traffic for providing good user experiences. One then performs an asymptotic analysis to develop a simple but efficient admission control rule. Finally, extensive simulations verify that the scheme is very effective and the theoretical result is very accurate. Docket No.: UM1269AUOO 33 ______________________________________________ 4.' ~ (U 0O~ * 00 . / / / / :/ / / 0 000 / 0 7: / 000 0* 0 0 / ./ to 6 14+ / :/ 00 NEX~ / : 0 * / * / . II3-' * / / -I * . / . - '- / . * 7: / .~p/ ,/ / 0 / / -' E / In * / / 0 IC) 0 IC) 0 Lu (N 0 z</p> |
