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    • 1. 发明授权
    • Communication control method for releasing communication apparatus from
occupied state
    • 用于将通信装置从被占用状态释放的通信控制方法
    • US5031175A
    • 1991-07-09
    • US407731
    • 1989-09-15
    • Shotaro TanakaMasao IkezakiHiroshi SasanumaYukiko Hase
    • Shotaro TanakaMasao IkezakiHiroshi SasanumaYukiko Hase
    • H04L12/413
    • H04L12/40026
    • A communication control method for use in a communication system including a plurality of communication control apparatuses interconnected through an information transmission path, each of the communication control apparatuses including a packet transmission/reception unit, a timer unit and a controller unit. When a first communication control apparatus has become unable to perform communication due to accidental power-off or a power supply failure or the like in the course of communication with a second communication control apparatus (which has been brought into a locked state by the first communication control apparatus), the invention prevents the second communication control apparatus from being left permanently in the locked state. In that case, the second communication control apparatus transmits a lock confirmation packet to the first communication control apparatus to make lock confirmation as to whether the locked state is to be maintained, when the second communication control apparatus does not receive any communication packet from the first communication control apparatus for a predetermined period of time. When no reply to the lock confirmation is received or alternatively when an unlock authorization packet is received by the second communication control apparatus, the second communication control apparatus releases itself from the locked state.
    • 一种通信控制方法,用于包括通过信息传输路径相互连接的多个通信控制装置的通信系统,每个通信控制装置包括分组发送/接收单元,定时器单元和控制器单元。 当第一通信控制装置在与第二通信控制装置(其已经被第一通信已经被锁定的状态)通信的过程中由于意外断电或电源故障等而变得不能进行通信 控制装置),本发明防止第二通信控制装置永久地处于锁定状态。 在这种情况下,当第二通信控制装置没有从第一通信控制装置接收到任何通信分组时,第二通信控制装置向第一通信控制装置发送锁定确认分组,以确定是否保持锁定状态的锁定确认 通信控制装置。 当不接收到锁定确认的应答时,或者当第二通信控制装置接收到解锁授权分组时,第二通信控制装置将其自身从锁定状态释放。