令牌传递网络节点消息缓冲容量的确定方法

在网络系统中,节点缓冲区内消息发生覆盖或溢出会造成消息的丢失,对于限时令牌网络,节点消息发送时间和消息缓冲容量的分配是影响消息实时性的重要因素.针对令牌传递网络分析了节点消息缓冲机制,说明了消息缓冲容量的确定与网络带宽分配方法的关系,并提出了消息缓冲容量的确定方法,导出了避免消息覆盖或溢出所需的最大发送和接收缓冲容量余度.指出在消息的产生间隔大于该消息的最大允许的延迟时间和接收节点响应时间的条件下,发送和接收端的消息缓冲容量等于被缓冲消息的长度.

Space Determination of Message Buffer for LTPB Network

In a network system,overflow or overwrite of message buffer will cause missing of messages.For a timed token network,message transmission time and the message buffering space allocation in a node are very important issues on network real time capability.This paper analyses the message buffering mechanism,describes the relationship of message buffering space and message transmission bandwidth allocation,and proposes a space determination method of message buffer for LTPB network.The maximum space redundancy avoiding buffer overflow for send and receive buffers has been derived.It is found that the space of send and receive buffers is equal to the message size under condition that the message gap time is greater than message latency and node response time.