一种IEEE802·11无线局域网的上下行带宽分配策略

A Bandwidth Allocation Scheme Between Uplink and Downlink Flows in IEEE 802.11 WLAN

针对IEEE 802.11基础架构网络中上下行带宽分配不公平的问题,提出了一种新的基于概率发送机制的上下行带宽分配策略,通过调节分组传输概率改变接入点(AP)或终端的接入概率,从而实现上下行带宽的公平分配.文中推导了公平带宽分配的最优发送概率与下行流数的关系,作为在AP或终端进行带宽分配的依据.仿真结果表明,文中策略能够提供准确的上下行带宽分配.

In order to overcome the unfairness bandwidth allocation between uplink and downlink flows in an IEEE 802.11 infrastructure Basic Service Set （BSS） network, a novel bandwidth allocation scheme based on the transi- mission probability is proposed, which adjusts the access probability of access point （AP） or wireless terminals by controlling the transmission probability for a fair bandwidth allocation. The relationship between the optimal trans- mission probability for fair bandwidth allocation and the number of downlink flows is also investigated and is then used as a reference to the bandwidth allocation at AP or wireless terminals. Simulated results show that the proposed scheme leads to a fair bandwidth allocation between uplink and downlink flows.