WLAN 与 EPON 融合接入网上行带宽分配算法

摘要

为了提高带宽的利用率，提出一种 WLAN 与 EPON 融合接入网上行带宽分配算法。该算法将无线终端接入的业务分为不同的服务等级，以实现不同业务 QoS 保证。首先，ONU-AP 给各个无线终端 STA 分配带宽，采用 IEEE 802．11E 协议的简单调度算法给语音业务和一般数据业务分配带宽，利用视频流的平均速率估算视频业务的传输带宽。其次，光线路终端 OLT 给各个 ONU-AP分配带宽，OLT 根据语音业务速率和当前视频业务流量分别估算语音、视频业务在下一个轮询周期的带宽，并将剩余带宽在重负载终端中二次分配，最后给一般数据业务分配带宽。通过仿真实验，结果表明：与传统算法相比，该算法的网络时延和丢包率明显降低，实现了带宽资源的合理分配。%In order to improve the utilisation ratio of bandwidth,we put forward an upstream bandwidth allocation algorithm for WLAN and EPON amalgamation access network.The algorithm divides the access operation of wireless terminals into different service grades to realise QoS assurance of different operations.First,the ONU-AP allocates bandwidth for STA of each wireless terminal,and adopts the simple scheduler algorithm of IEEE 802.11E protocol to allocate bandwidth for voice and common data operations,and utilises the average rate of video flow to estimate the transmission bandwidth of video operation.Secondly,the optical line terminal (OLT)allocates bandwidth for each ONU-AP,according to the rate of voice operation and current flow of video operation,OLT estimates the bandwidth for voice and video operation in the next polling period separately,and allocates secondarily the surplus bandwidth for heavy load terminals,and finally allocates the bandwidth for common data operations.Through the simulation experiment,results demonstrate that compared with traditional algorithm, the network delay and losing packet ratio of the algorithm are reduced obviously,it realises the reasonable allocation of bandwidth resource.