Multiplex communications – Wide area network – Packet switching
Patent
1990-05-23
1992-05-26
Olms, Douglas W.
Multiplex communications
Wide area network
Packet switching
370 31, 370 29, H04J 316
Patent
active
051174235
ABSTRACT:
A method of, and system for, data transmission over a time division duplex channel in which at least one duplex voice channel constituted by a pair of non-adjacent time slots (or physical channels) in a succession of time frames is allocated for effecting a data transaction between a first and a second station, one of said pair of time slots (or physical channels) being normally designated for unidirectional transmission of data in a first direction between the first and second stations and the other of the pair of time slots (or physical channels) being normally designated for unidirectional transmission of data in a second direction, opposite to the first direction. The system comprises means for determining that either of the time slots (or physical channels) of a duplex voice channel will not participate in, or is not participating in, the transmission of useful data because the data transfer is largely asymmetric and for releasing the non-participating time slots (or physical channels) and making them available for other unidirectional signalling, such as the parallel transmission of data packets in the current data transaction, retransmission of corrupted data packets, or the parallel transmission of data packets in another, largely asymmetric data transaction.
REFERENCES:
patent: 4470141 (1984-09-01), Takada
patent: 4672601 (1987-06-01), Ablay
patent: 4757496 (1988-07-01), Bartholet et al.
patent: 4852089 (1989-07-01), Berry et al.
Owen Frank C. G.
Pudney Christopher D.
Shepherd Robert
Barschall Anne E.
Olms Douglas W.
Ton Dang
U.S. Philips Corporation
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