一种实时以太网介质访问控制协议的时延性能分析

本文提出一种新的基于持续竞争的实时以太网介质访问控制协议,该协议能够保证实时信号的发送有确定的最大时延.在新协议下,如果检测到冲突,实时节点并不像普通以太网节点一样停止传输,而是坚持发送竞争信号,利用信道冲突通知非实时节点或者低优先级实时节点停止传输,把信道留给高优先级的实时节点.而且该协议与普通以太网介质访问控制协议兼容,这样实时节点与普通以太网节点能共存于同一网络系统中互相通信.文中详细描述了新型以太网介质访问控制协议,分析了实时信号的发送时延,理论分析和仿真均证明了该协议是可行和有效的.

Delivery Delay Analysis of a Real-time Ethernet MAC Protocol

This paper proposes a new persistent contention based real time Ethernet MAC protocol that provides a predictable upper bound for the delivery delay of real time frames.Under the new protocol,if a collision occurs,the real time station keeps on sending a contention signal instead of stopping transmissions.Through this persistent transmission mechanism the protocol informs non real time and low priority real time stations to stop transmissions and leaves the bandwidth to high priority stations.Moreover,this protocol is compatible with Ethernet MAC protocol and thus real time stations can coexist with standard Ethernet stations in the same system.The paper describes the protocol in detail and analyses the delivery delay for real time traffic.The analysis and the simulation results demonstrate the method is correct and efficient.