Communications protocol using microslots

Details Communications protocol using microslots Communications protocol using microslots

1991-06-27

1993-12-14

Olms, Douglas W.

Multiplex communications

Wide area network

Packet switching

370 99, H04J 316

Patent

active

052710173

ABSTRACT:
An improved protocol for a radio communications system (100) having a base station (103), radio units (101), an inbound channel (107) for conveying information from the radio units to the base station, an outbound channel (105) for conveying information from the base station to the radio units, a first unit of time is defined as a microslot (201, 203, 205), and a second unit of time is defined as a slot (207), the slot comprising an integral number of consecutive and contiguous microslots. The base station sends timing information to the radio units, and indicates to the radio units when the inbound channel is idle by, first, determining when a microslot time period has expired (303) and, when this occurs, then determining when a slot time period has expired (305). If a slot has expired, the base station then determines whether the inbound channel is idle. If the inbound channel is idle (307), the base station then sends (311) a first symbol to the radio units on the outbound channel, but if the inbound channel is busy, the base station sends (309) a second symbol to the radio units on the outbound channel. Otherwise, if a slot has not expired, the base station sends (313) a third symbol to the radio units on the outbound channel. In a four-level frequency shift keying (FSK) system, for instance, the first (idle) and second (busy) symbol may use a -3 and -3 relative FSK frequency offsets, and the third symbol may use either a +1 or -1 relative FSK frequency offset.

REFERENCES:
patent: 3710027 (1973-01-01), Herter et al.
patent: 3982075 (1976-09-01), Jefferis et al.
patent: 4129749 (1978-12-01), Goldman
patent: 4987570 (1991-01-01), Almond et al.

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