Method and apparatus for communicating in a dispatch communicati

Details Method and apparatus for communicating in a dispatch communicati Method and apparatus for communicating in a dispatch communicati

1997-11-07

1998-12-15

Eisenzopf, Reinhard J.

Telecommunications

Transmitter and receiver at separate stations

Plural transmitters or receivers

455527, H04B 100

Patent

active

058506110

ABSTRACT:
A dispatch communication system (100) that includes a system controller (101), multiple base sites (103-105), and a group of communication units (107-111) employs a method and apparatus for communicating therein. A system device (either the system controller or a communication unit) establishes a dispatch communication between the group of communication units. Once the communication is established, the system device starts a timer and continuously determines a first length of time (call time) since establishment of the communication. The system device also determines whether an event indicative of call reassignment has occurred during the communication. When such an event has occurred, the system device determines a second length of time (hang time) based on the call time, wherein the hang time commences upon the occurrence of the event. Upon determining the hang time, the system device further determines whether call reassignment has occurred within the hang time. When call reassignment has not occurred within the hang time, the system device terminates the call.

REFERENCES:
patent: 4646345 (1987-02-01), Zdunek et al.
patent: 5159702 (1992-10-01), Aratake
patent: 5491835 (1996-02-01), Sasuta et al.
patent: 5530914 (1996-06-01), McPheters
patent: 5745853 (1998-04-01), Hippelainen

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