一种基于动态时间的无线网络带宽分配机制

An Active-time Based Bandwidth Allocation Scheme on Wireless Networks

无线多跳ad hoc网络的应用面临着巨大的挑战,即在无线资源有限的条件下对用户传输速率进行有效地控制.提出了一种基于动态时间的无线带宽分配机制,这种机制能确保在无线多跳ad hoc网络模型中的各个用户分配到公平带宽资源.在每一跳都能够公平地分配给每个竞争流相应的信道时间比例,依据这些时间比例每一跳为经过自己的所有数据流计算更新速率并且将需要更新的数据流记录在每个数据包头部的某些控制字段.在这种机制中每条数据流的源端能够最终调节它的发送速率来达到它应该占有的公平份额.相应地提出了一种算法去实现上面这种机制.实验证明这种算法能够在多跳数据流中公平地分配带宽.

The application of multi-hop wireless ad hoc networks （WANETs） has been facing a great challenge to implement cooperative control over user transmission rates under the resource restrictions. An active-time based bandwidth allocation scheme that can ensure fair bandwidth allocation among the users in a multi-hop WANET model is proposed. This scheme operates at each hop and fairly allots each competing flow a share of channel time, according to which each hop then computes the updating rate for each flow traversing the hop and records their updated rates into each data packet＇s special control header. The source of each flow in this scheme can eventually adjust its sending rate to reach its fair share. An algorithm is developed to implement the above mechanism. Simulation results show that our proposed algorithm is able to fairly distribute bandwidth among multi-hop flows.