WDM城域环网中支持可变长分组的节点结构及MAC协议设计  

On the Design of Node Architecture and MAC Protocol for WDM Metro Ring Networks with Variable Length Packets Support

作　　者：张治中[1] 雒江涛[1] 程方[1] 蒋铭[2] 曾庆济[2] 

机构地区：[1]重庆邮电学院通信工程学院,重庆400065 [2]上海交通大学光纤国家重点实验室,上海200030

出　　处：《电子学报》2005年第1期1-6,共6页Acta Electronica Sinica

基　　金：重庆市教委基金 (No 0 4 0 50 4;0 4 0 50 2 );国家 863计划 (No 2 0 0 1AA1 2 1 0 73);国家自然科学基金 (No 69990 540 )

摘　　要：WDM城域环网在升级时 ,信道数可能是不变的 .本文基于此设计了一种新颖的节点结构 ,它由固定发射器和一组固定接收器组成 .基于该结构 ,文中给出了支持可变长分组的时隙结构及MAC协议 .由于实现MAC协议毋需专用波长信道 ,提高了资源利用率 .理论分析和仿真结果证明了本文设计方法可以充分利用空间重用能力 ,获得很好的网络流量 ,分组排队时延及分组丢弃率 .对于信道数较多 ,或者网络在升级时信道数也可能变化的情况 ,本文建议采用固定发射器 ,一组“准”调谐的接收器结构 .该方案可在实现复杂度 ,网络性能及成本间取得折衷 .Based on the scenario that the number of wavelengths may be fixed by upgrading the WDM metro ring networks, this paper proposes a new WDM slotted-ring architecture with nodes equipped with one fixed transmitter and a set of fixed receivers. A detailed design and analysis of node architecture and MAC protocol, which aims at achieving fairness among the nodes and efficient bandwidth utilization, is given. It is shown through theoretical analysis and simulation results how the proposed architecture and MAC protocol can achieve a good throughput, queuing delay and packet loss probability. In the case of a large number of wavelengths, or if the number of wavelengths may also increase by upgrading the networks, this paper further proposes an original design method: employing one fixed transmitter and a set of tunable receivers that can only be tuned among partial continuous wavelengths, we show this method can achieve a good tradeoff in terms of performance metrics such as network's throughput, cost and implementing complexity.

关 键 词：波分复用 城域时隙环网 节点结构 MAC协议 

分 类 号：TN913.24[电子电信—通信与信息系统]