针对时分波分复用无源光网络长距离和广覆盖特性带来往返时延增大,造成高优先级业务时延性能严重恶化的问题,提出带有业务区分的混合资源调度算法.根据网络负载实时调整光网络单元组的波长数以实现资源共享,并动态划分子周期以对不同优先级业务进行区分服务;设计混合资源调度算法,以在线方式填充波长空隙,以离线方式保障资源高效调度.仿真结果表明,所提算法能够满足不同优先级业务的时延要求,保证服务质量,并提高信道利用率.%The characteristics of long reach and wide coverage in time and wavelength division multiplexed passive optical network(TWDM-PON) increase the round trip time,resulting in the severe deterioration of the delay performance of high priority traffic.This paper proposes a hybrid resource scheduling algorithm with traffic differentiation to solve this issue.Firstly,the wavelengths of ONU(Optical Network Unit) groups are realtimely adjusted to achieve resource sharing in accordance with the network load,and traffic sub-cycles are dynamically divided for the purpose of differentiated traffic.Furthermore,we respectively exploit the online and offline scheduling to fill the wavelength voids and ensure the efficiency of resources scheduling.Finally,the simulation results show that the proposed algorithm can satisfy the delay requirements of different priority traffic,guarantee the quality of service and improve the channel utilization ratio.
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