針對目前用戶的多業(yè)務(wù)情況，提出了一種支持QoS的EPON上行動態(tài)帶寬分配算法。給出了兩種控制幀結(jié)構(gòu)，設(shè)計了兩種新型的支持多業(yè)務(wù)QoS的EPON上行信道動態(tài)帶寬分配算法：基于光網(wǎng)絡(luò)單元ONU端的單級授權(quán)混合發(fā)送算法和基于光線路終端OLT的多級授權(quán)分離發(fā)送算法。通過仿真測試，發(fā)現(xiàn)兩種算法均有良好的時延特性和較穩(wěn)定的隊列尺度，能較好地支持多業(yè)務(wù)優(yōu)先級的EPON系統(tǒng)。
關(guān) 鍵 詞 多業(yè)務(wù)優(yōu)先級; 動態(tài)帶寬分配; 以太幀; 時延特性

Abstract For the situation of many services in the users’ request,the paper introduces DBA algorithm in EPON upstream channel in support of QoS. We propose two control frames and two novel DBA algorithms supporting multi-priority services with differentiated QoS: SGMTA algorithm based on ONU and MGSTA algorithm based on OLT. In our conducted simulation experiments, both algorithm show satisfied delay performance and stable buffer size as the network load increases. Thus, we conclude that these two novel DBA algorithms are reasonable and practical in support of multi-priority EPON system.
Key words multi-priority services; dynamic bandwidth allocation; ethernet frame; delay