Research On Dynamic Resource Allocation In Multi-wavelength EPON

In recent years, with users access to the further growth of the demand for bandwidth and num-ber of users continues to increase, the traditional EPON system is unable to meet the demand for bandwidth. WDM-PON have a strong ability to access, but, at the present stage WDM-PON the cost was too high, is not suitable for large-scale application of cost-sensitive access network. A compromise solution based on TDM/WDM mixed PON has become a hot spot of research, and gradually business trends. Multi-wavelength EPON system is such a flexible solutions in the process of transition from TDM to the WDM.This article first introduced mλ-EPON system framework and work principle and extend agreement on the MPCP--mλ-MPCP simple discussions and registration system, set mλ-EPON systems ranging scheme and explore mλ-EPON protection switching functions.This paper focus study on bandwidth of upstream resources scheduling algorithms in mλ-EPON system. Wavelength scheduling resource scheduling strategy of classic S-IPACT.DRA-1 with the use of authorization, did not form a perfect wavelength and time slot"T+λ"unified dis-patch strategy, causing the channel low utilization rate. In view of this problem, This paper de-signed with fixed polling period of resource scheduling algorithm of QoS guarantee DRA-2 and adaptive cycle of resource scheduling algorithm of load balancing DRA-3. DRA-2 calculation pro-gram design in consideration of the 2 guaranteed bandwidth and 4 remaining bandwidth allocation scheme and OPNET Modeler simulation of distinguishing ONU type determines the guaranteed bandwidth and distribution of residual scheme of bandwidth than other solutions. DRA-3 use of bandwidth request values the largest ONU(M) final authorization, and on two wavelength channel allocation of a certain amount of bandwidth, which authorized the total balance, the maximum uti-lization of bandwidth resources. meanwhile, M earlier REPORT mechanism has been greatly re-duced or even eliminated RTT. Simulation results show that EF business DRA-2 algorithm of delay stability, business QoS guarantee in delay. DRA-3 compared with other DRA algorithm, with the maximum channel utilization.