波长灵活无源光网络的动态波长和带宽分配算法

摘要

研究了波长灵活无源光网络(WA-PON)的动态波长和带宽分配问题,提出一种改进的动态波长带宽分配(IDWBA)算法.该算法根据光网络单元的带宽请求灵活授权波长信道,可以减少保护带宽和控制帧开销造成的带宽浪费.仿真结果表明,与已有算法相比,IDWBA算法可以进一步降低全网上行数据包平均时延和丢包率.%In this paper, the issue of dynamic wavelength and bandwidth allocation (DWBA) in wavelength-agile passive optical networks (WA-PON) is investigated. An improved dynamic wavelength and bandwidth allocation (IDWBA) algorithm is proposed. According to the bandwidth requirement of an optical network unit (ONU), IDWBA flexibly assigns appropriate number of wavelength channel to it, which is beneficial to reduce the bandwidth waste caused by the bandwidth guard and the overhead of control frame. The simulation results show that the IDWBA algorithm can further reduce the average delay and packet loss ratio compared with the existing algorithms.