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    • 7. 发明授权
    • System for re-transmission in data communication
    • 数据通信中的重传系统
    • US5715257A
    • 1998-02-03
    • US541870
    • 1995-10-10
    • Hideo MatsukiHitoshi Takanashi
    • Hideo MatsukiHitoshi Takanashi
    • H04L1/16H04L1/18H04L1/08
    • H04L1/1835H04L1/1664H04L1/1809H04L1/1874
    • An SR (Selective Repeat) ARQ system with limited buffer memory is realized by modifying a part of a user data area. A transmitter side modifies a part of a user data area in a data frame so that it differs at least one bit from corresponding part of a frame with the same frame number as that of a current frame in a preceding modulo turn, and a receiver side compares said part of a user data area with corresponding part of a frame with the same frame number as that of a current frame in a preceding modulo turn. When they coincide, the receiver side disregards the received frame as it is re-transmitted frame which is already received correctly, and when they do not coincide, the receiver side takes the received frame. Preferably, said part of a user data area is the last word area in a user data area in a frame structure. When a user data has more words than capacity of a user data area in a frame structure, and when last word is completely equal to last word of a frame with the same frame number as that of a current frame in a preceding modulo turn, the last word in a user data area is transferred to a succeeding frame, and an area for that last word is filled with a data which differs at least one bit from a data in the last word in the corresponding frame having the same frame number as that of the current frame in a preceding modulo turn.
    • 通过修改用户数据区域的一部分来实现具有有限缓冲存储器的SR(选择性重复)ARQ系统。 发送器侧修改数据帧中的用户数据区域的一部分,使得其与至少一个比特与具有与前一模数转弯中的当前帧相同的帧号的帧的相应部分不同,并且接收机侧 将用户数据区域的所述部分与具有与前一模数转弯中的当前帧相同的帧号的帧的对应部分进行比较。 当它们重合时,接收机侧忽略接收到的帧,因为它是已被正确接收的重传帧,并且当它们不一致时,接收机侧接收接收的帧。 优选地,用户数据区域的所述部分是帧结构中的用户数据区域中的最后一个字区域。 当用户数据具有比帧结构中的用户数据区域的容量更多的单词时,并且当最后一个单词完全等于具有与前一模数转换中的当前帧的帧编号相同的帧号的帧的最后一个字时, 用户数据区中的最后一个字被传送到后一帧,并且用与该帧相同帧数的相应帧中的最后一个字中的数据至少不同于一位的数据填充该最后一个字的区域, 的当前帧在前一个模转。