无线Mesh网络中基于奖励机制的均衡传输方案

Application of Balanced Transmission Mechanism Based on Reward in Wireless Mesh Network

无线Mesh网络由于自私节点的存在而造成双向流量传输不均衡,为解决这一问题,提出了一种基于奖励机制的均衡传输方案;首先,研究了自私TAPs和自私网关在无线Mesh网络中如何影响双向流量的均衡传输问题;然后,建立了一套公平参考模型和虚拟信用币,为提出的机制提供理想基准,并推导出了每个传输访问点(TAP)的双向目标吞吐量;最后,提出一种奖励机制,通过信用币和代币支付策略来鼓励闲置TAP转发数据,同时使网关尽可能均衡地向TAP传输下行数据;该模型是通过转发数据来获得信用币,通过发送局部数据来消耗信用币;在一个具有3个TAP的无线Mesh网络上仿真结果表明,该方法能够在存在自私节点情况下确保双向流量的均衡;实验结果也证明了提出的基于奖励机制的均衡传输方案正确且有效。

In order to solve this problem, wireless mesh network （WMN） is unhalanced due to the existence of selfish nodes. A balanced transmission scheme based on reward mechanism is proposed. First, we study how the selfish TAPs and selfish gateways affect the balanced transmission of bidirectional traffic in wireless Mesh networks. Then, a set of fair reference models and virtual credits were created, providing an ideal benchmark for the proposed mechanism and deriving the bidirectional target throughput for each Transport Access Point （TAP）. Finally, an incentive mechanism is proposed to encourage idle TAPs to forward data through credit and token payment strategies, while enabling gateways to transmit downlink data to TAPs as evenly as possible. The model obtains the credit currency by forwarding the data and consumes the credit currency by sending the partial data. The simulation results on a wireless Mesh network with 3 TAPs show that this method can ensure the bidirectional traffic to be balanced in the presence of selfish nodes. The experimental results also prove that the proposed balanced transmission scheme based on incentive mechanism is correct and effective.