Multiplex communications – Channel assignment techniques – Carrier sense multiple access
Patent
1996-10-24
1999-10-05
Ton, Dang
Multiplex communications
Channel assignment techniques
Carrier sense multiple access
370461, H04J 302
Patent
active
059635592
ABSTRACT:
For radio data (DT) transmission by media access based on a CSMA scheme in a system, such as a radio LAN, wherein a source node retransmits a DT frame if an ACK monitor IFS interval S lapses following forward transmission of the DT frame before reception of an ACK frame which a destination node backward transmits an ACK transmission IFS interval T (longer than the interval S) following due reception of the DT frame, a transmission mode is forward changed from an original mode of the forward transmission to a slow mode if retransmission fails with the original mode twice and the slow mode later used for backward transmission. Each of the source and the destination nodes is put, in the original mode, in a waiting state for afresh use as either a source or a destination node after a data transmission IFS interval D (longer than the interval T) either when the source node receives the ACK frame in the original or the slow mode or if the ACK frame is not received even the retransmission is repeated a predetermined number of times, when the DT frame is discarded with the backward transmission given up.
REFERENCES:
patent: 5615212 (1997-03-01), Ruszczyk et al.
patent: 5757790 (1998-05-01), Taketsugu
NEC Corporation
Ton Dang
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