基于EPON的动态带宽分配算法研究

In this paper, an architecture of next generation access network namely Ethernet-PON (EPON) is presented. A novel efficient dynamic bandwidth allocation algorithm based on EPON namely fixed cyclic polling in pipeline dynamic bandwidth allocation (CPP-DBA) algorithm is investigated. By using two level bandwidth allocation mechanism, bandwidth pre-request for expedited forward (EF) service and small bandwidth request allocated first principle for assured forwarding (AF) and best effort (BE) services to allocate bandwidth, CPP meets QoS requirements effectively in a multi-service access scenario. A simulation is conducted to study the performance of CPP-DBA algorithm in EPON. The results show that CPP supports EF service with low packet delay and jitter, balances priority and fairness between AF and BE services. Compared with the traditional DBA algorithm, CPP meet QoS requirements excellently and adapted EPON better with higher bandwidth efficiency and lower complexity.