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硬实时网络通信研究的重点在于对每个报文的时间限制的保证 .实时通信协议所采用的报文保证策略分为两类 :有保证 (guarantee)策略和尽力保证 (best- effort)策略 .前者保证报文的期限能够得到满足 ,而后者尽量使报文在期限到达前得到传送 .根据具体应用环境的不同 ,这些策略有很多变体 .
The research of hard real-time network communication focuses on the guarantee of the time limit of each message.The strategy of message assurance adopted by real-time communication protocol falls into two categories: guarantee strategy and best-effort strategy. The former ensures that the deadline of the message can be met, and the latter tries to make the message be sent before the expiry of the message.According to the specific application environment, there are many variations of these strategies.