WLAN中基于协作博弈的比例公平性带宽分配机制

在IEEE 802.11无线局网(WLAN)中，从协作博弈论的角度提出一种按用户流权重成比例(比例公平性)的带宽分配方案．通过建立用户流基于吞吐量的效用函数，将比例公平性的带宽分配过程建模为以整体效用最大化为前提，以个体效用最大化为目的的用户流之间的协作博弈．依据此博弈的纳什议价解(即用户流获取比例公平性带宽份额的最优信道竞争参数CW_min)，提出了带宽分配方案PF-DCF．仿真结果表明，与802.11e EDCA相比，PF-DCF不仅有效的解决了低权重用户流无法获取系统带宽的问题，而且将WLAN在饱和状态下的吞吐量提高15％．

Cooperative game theoretic bandwidth sharing scheme for proportional fairness in WLAN

To ensure proportional fairness (i.e., the system bandwidth is shared among the user flows according to their weights) in the IEEE 802.11 wireless LANs, a cooperative game theoretic bandwidth sharing scheme, called PF-DCF, is proposed. By setting the throughput based utility function, the bandwidth sharing procedure is modeled as a cooperative game. In the game, the user flows intend to maximize their utilities under the premise that the system utility is maximized. According to the Nash bargaining solution(NBS) of the game, i.e., the user stations’ optimal packet transmission probabilities to acquire proportional fairness, a bandwidth sharing scheme (PF-DCF) is developed. Simulation results indicate that when using PF-DCF in the ad hoc mode, the user flows can fairly share the system bandwidth by broadcasting their weights information and adjust the backoff parameter (CW_min) to the NBS. In addition, by comparison with 802.11e EDCA, PF-DCF can effectively utilize the channel resource.