一种基于ALOHA时隙的多优先级控制协议设计与仿真

提出了一种基于时隙ALOHA的传输动态控制协议。系统信道分为数据信道和控制信道，信道均以时隙划分，其在时隙边界上同步。而控制信道中时隙又进一步划分为多个子时隙。通过建立一个离散马尔科夫链模型对其进行性能分析可知，它能够适用于实际塑料光纤接入网络中工作站数量远远大于信道数的要求。由于在文献1]所述的控制协议的基础上加入了优先级的控制，它可以根据各类业务对时延的不同要求进行优先级分配。仿真结果表明，此方案具有一定的合理性和可行性。

Analysis and Simulation of Multi-priority Reservation Protocol Based on Slotted ALOHA

In this paper, a dynamic transmit control protocol based on slotted ALOHA is proposed. This protocol can be applied to the passive star topology network. The channel of this system is divided into data channel and control channel. All channels are slotted and synchronized to the slot boundaries. The slot on the control channel is further divided into a number of minislots. It is a conflict-free protocol. By using a reservation scheme and arbitration algorithm, channel collision and destination conflict can be avoided. Analyzing its performances through using a discrete time Markov model, we know that it can be applied to the practical plastic optical fiber access network in which the number of the stations is far larger than that of the channels. Transmit channels can be distributed according to different delay demands of all kinds of services by using priority control protocol. The network throughout and average delay have been investigated in numerical analysis and simulation experiments. The more the throughout of system, the more the number of channel. The delay-time decreases as the number of channel increases. The throughout stabilizes while the delay-time increases with the increasing of load. The numerical results indicate that this scheme is reasonable and effective.