In order to support the access of voice

video and data services

the dynamic bandwidth allocation algorithm for EPON need to provide services of different priorities with different quality of services and reduce the latency of real-time services

thus resulting in light load penalty.In respect to this problem

a multi-queue bandwidth allocation scheme is presented

i.e.optical network units request bandwidths for service with different priorities respectively and a prediction scheme is introduced.A specific algorithm is given and simulation is carried out.Simulation results show that this scheme can not only support multi-service access

but also fundamentally avoid light load penalty and further improve the QoS for services with high priorities.