用于塑料光纤接入网的三优先级控制协议设计

Design of Three Priority Control Protocol Applied to Plastic Optic Fiber Access Network

为了解决用有限的码字来实现多于码字数目的多媒体工作站间的信息通信,提出一种基于光码分多址(Optical Code Division Multiple Access,OCDMA)技术的塑料光纤接入网的多优先级控制协议.该协议通过使用预约方案和仲裁算法可以有效地解决信道冲突和目的地址的冲突问题,可以支持多媒体信息传输中各类信息不同的时间延迟要求.通过建立一个离散马尔科夫链模型对塑料光纤接入网的网络吞吐量和平均延时时间进行了数值分析和仿真实验,结果证明,这种多优先级控制协议能够适应多媒体网络中各类业务对信号时延要求的不同进行信道的优先级分配.

A novel multi-priority reservation protocol for plastic optical fiber access network based on OCDMA technology was proposed. Using reservation scheme and distributed arbitration algorithm,channel collision and destination conflict can be avoided. The network throughput and average delay were investigated by numerical analysis and simulation experiments through discrete time Markov model. Transmit channels are distributed according to the different delay demands of all kinds of services by using priority control protocol. The network throughout and system delay are calculated and simulated. The delay-time decreased as the number of the channel increases. The throughout stabilized while the delay-time increased with the increasing of load. It is shown that the multi-priority reservation protocol in POF access network based on OCDMA technology can efficiently support the transmission of multimedia messages that require the different time-delay.