Telecommunications – Transmitter and receiver at separate stations
Patent
1993-02-24
1995-06-06
Eisenzopf, Reinhard J.
Telecommunications
Transmitter and receiver at separate stations
455 561, 379 60, H04Q 702
Patent
active
054230659
ABSTRACT:
A mobile wireless communications system, comprises a plurality of base stations with associated respective coverage zones, each base station being connected to a central host computer and being capable of establishing two-way communication with mobile units in its associated coverage zone and a switch having a plurality of line interfaces connected to the base station. The host computer can select one of the base stations in range of an active mobile unit to establish a call therewith, determine the line interface associated with the call, determine when a hand off from one base station to the next is to occur as the active mobile unit moves between coverage zones, send a hand off message to the switch identifying the current active line interface and the target line interface after hand off associated with the call, and initiate a hand off by sending a call originate message to the next base station instructing it to originate the call on the target line interface. The switch comprises a first memory for storing call data records containing channel assignment and line interface data for each call, a second memory for storing data received from the host computer identifying the target line interface with an imminent hand off from the active line interface associated with the call, and an arrangement for assigning a channel associated with the active line interface to the target line interface on receipt of a call origination signal on the target line interface. In this way, a hand off can take place simply by writing the new line interface data into the existing call data record.
REFERENCES:
patent: 4759051 (1988-07-01), Han
patent: 5117502 (1992-05-01), Onoda et al.
patent: 5203010 (1993-04-01), Felix et al.
patent: 5222249 (1993-06-01), Carney
Eisenzopf Reinhard J.
Lin Mary M.
Mitel Corporation
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