Multiplex communications – Wide area network – Packet switching
Patent
1993-10-25
1995-05-02
Hsu, Alpus
Multiplex communications
Wide area network
Packet switching
370 953, 379 59, 455 331, 455 541, 455 673, H04B 726, H04Q 700
Patent
active
054126592
ABSTRACT:
Within a cell of a TDMA mobile communication system, each mobile station transmits a control message on an up-link frame. On receiving it, the base station determines if the message quality is affected during transmission. A corruption status indication is stored into a position of a frame status memory corresponding to the up-link frame if the message quality is low. When the base station detects a frame identification contained in the received message, it erases the corruption status indication stored in a position identified by the detected frame identification, and transmits a control message on a down-link frame, containing the result of the quality determination. In response, the mobile station stores the identification of the frame of the message into a collision memory, and retransmits a copy of the up-link control message containing the frame identification.
REFERENCES:
patent: 4765753 (1988-08-01), Schmidt
patent: 4890332 (1989-12-01), Takahashi
patent: 5042082 (1991-08-01), Dahlin
patent: 5159593 (1992-10-01), D'Amico et al.
patent: 5175867 (1992-12-01), Wejke et al.
patent: 5257399 (1993-10-01), Kallin et al.
Fujita Masashi
Harada Toshitaro
Hsu Alpus
NEC Corporation
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