Method for a communication unit to operate in either a trunking or a cellular communication system
First Claim
1. In a geographic region that contains at least one trunking communication system and at least one cellular communication system, wherein the trunking communication system and the cellular communication system have substantially overlapping coverage areas and the at least one trunking communication system is operably coupled to the at least one cellular communication system, a method for a communication unit to operate in either the at least one trunking communication system or the at least one cellular communication system, the method comprises the steps of:
- a) monitoring at least one control channel of the at least one trunking communication system;
b) detecting a transfer affiliation message;
c) transferring affiliation from the at least one trunking communication system to the at least one cellular communication system when the transfer affiliation message is detected and when the communication unit is not active in a communication within the at least one trunking communication system;
d) monitoring at least one control channel of the at least one cellular communication system; and
e) receiving a communication via the at least one cellular communication system when the communication unit detects its cellular system access number.
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Accused Products
Abstract
A communication unit may operate in either a trunking communication system and a cellular communication system when the coverage areas of each system overlap. Typically, the communication unit is affiliated with the trunking communication system and operates normally therein. When a call is received or being placed via the cellular communication system, the communication unit transfers its affiliation to the cellular communication system and operates therein. The communication unit is prompted by the trunking communication system to transfer its affiliation for incoming calls and does so automatically for outgoing calls. Once the communication ends, the communication unit transfers its affiliation back to the trunking communication system within a predetermined period of time.
142 Citations
13 Claims
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1. In a geographic region that contains at least one trunking communication system and at least one cellular communication system, wherein the trunking communication system and the cellular communication system have substantially overlapping coverage areas and the at least one trunking communication system is operably coupled to the at least one cellular communication system, a method for a communication unit to operate in either the at least one trunking communication system or the at least one cellular communication system, the method comprises the steps of:
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a) monitoring at least one control channel of the at least one trunking communication system; b) detecting a transfer affiliation message; c) transferring affiliation from the at least one trunking communication system to the at least one cellular communication system when the transfer affiliation message is detected and when the communication unit is not active in a communication within the at least one trunking communication system; d) monitoring at least one control channel of the at least one cellular communication system; and e) receiving a communication via the at least one cellular communication system when the communication unit detects its cellular system access number. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. In a geographic region that contains at least one trunking communication system and at least one cellular communication system, wherein the at least one trunking communication system and the at least one cellular communication system have substantially overlapping coverage areas, the at least one trunking communication system is operably coupled to the at least one cellular communication system, and a plurality of communication units primarily monitor a control channel of the at least one trunking communication system, a method for a communication channel controller of the at least one trunking communication system to provide access to either the at least one trunking communication system or the at least one cellular communication system for the plurality of communication units, the method comprises the steps of:
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a) determining that at least one of the plurality of communication units is targeted for an incoming telephone communication within the at least one cellular communication system; and b) transmitting a transfer affiliation message to the at least one communication unit of the plurality of communication units. - View Dependent Claims (10, 11, 12, 13)
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Specification