Method for locating a communication unit within a multi mode 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 at least one trunking communication system and the at least one cellular communication system have substantially overlapping coverage areas, wherein the at least one trunking communication system is operably coupled to the at least one cellular communication system, wherein at least some of a plurality of communication units are located within the geographic region, and wherein the at least some of the plurality of communication units are affiliated with the at least one trunking communication system and are operable in either the at lest one trunking communication system or the at least one cellular communication system, a method for locating a particular communication unit of the at least some of the plurality of communication units within the geographic region, the method comprises the steps of:
- a) transmitting, by a communication channel controller of the at least one trunking communication system, a location request message to the particular communication unit;
b) upon receiving the location request message, transferring affiliation of the particular communication unit from the at least one trunking communication system to the at least one cellular communication system;
c) transmitting, by the particular communication unit, a location message on a control channel of a cell within the at least one cellular communication system;
d) transferring the location message from the at least one cellular communication system to a communication channel controller of the at least one trunking communication system, ande) determining, by the communication channel controller, the particular communication unit'"'"'s location based upon the cell of the at least one cellular communication system wherein the particular communication unit transmitted the location message.
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Accused Products
Abstract
In a geographic region that contains a trunking communication system and a cellular communication system, wherein the coverage area of the trunking system and cellular communication system substantially overlap and wherein some communication units are located within the geographic region, a method is disclosed for a trunking communication system to locate a particular communication unit. In order to locate a particular communication unit, a communication channel controller of the trunking communication system transmits a location request to the particular communication unit. Upon receiving the location request, the particular communication unit transfers its affiliation from the trunked communication system to the cellular communication system. Once affiliated with the cellular communication system, the particular communication unit transmits a location message to the communication channel controller via the cellular communication system. The location message received by the communication channel controller can be deciphered to determine the cell of the cellular communication system that the communication is located in.
126 Citations
3 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 at least one trunking communication system and the at least one cellular communication system have substantially overlapping coverage areas, wherein the at least one trunking communication system is operably coupled to the at least one cellular communication system, wherein at least some of a plurality of communication units are located within the geographic region, and wherein the at least some of the plurality of communication units are affiliated with the at least one trunking communication system and are operable in either the at lest one trunking communication system or the at least one cellular communication system, a method for locating a particular communication unit of the at least some of the plurality of communication units within the geographic region, the method comprises the steps of:
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a) transmitting, by a communication channel controller of the at least one trunking communication system, a location request message to the particular communication unit; b) upon receiving the location request message, transferring affiliation of the particular communication unit from the at least one trunking communication system to the at least one cellular communication system; c) transmitting, by the particular communication unit, a location message on a control channel of a cell within the at least one cellular communication system; d) transferring the location message from the at least one cellular communication system to a communication channel controller of the at least one trunking communication system, and e) determining, by the communication channel controller, the particular communication unit'"'"'s location based upon the cell of the at least one cellular communication system wherein the particular communication unit transmitted the location message.
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2. 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, wherein at least some of a plurality of communication units are located within the geographic region, and wherein the at least some of the plurality of communication units are affiliated with the at least one trunking communication system, a method for locating a particular communication unit of the at least some of the plurality of communication units within the geographic region, the method comprises the steps of:
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a) transmitting a location request message to the particular communication unit; b) transferring affiliation of the particular communication unit from the at least one trunking communication system to the at least one cellular communication system, wherein, once the particular communication unit is affiliated with the at least one cellular communication system, the particular communication unit obtains identifying information regarding a cell of the at least one cellular communication system that the particular communication unit is located; c) transferring affiliation of the particular communication unit from the at least one cellular communication system to the at least one trunking communication system, when the particular communication unit has obtained the identifying information; d) determining location of the particular communication unit based on the identifying information.
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3. 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, wherein at least some of a plurality of communication units are located within the geographic region, and wherein the at least some of the plurality of communication units are affiliated with the at least one trunking communication system, a method for a particular communication unit of the at least some of the plurality of communication units to transmit its location to a communication channel controller of the at least one trunking communication system, the method comprises the steps of:
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a) receiving a location request message; b) transferring affiliation from the at least one trunking communication system to the at least one cellular communication system; c) obtaining identifying information regarding a cell of the at least one cellular communication system that the particular communication unit is located; d) transferring affiliation from the at least one cellular communication system to the at least one trunking communication system, when the identifying information is obtained; e) transmitting the identifying information such that the communication channel controller determines the location of the particular communication unit based on the identifying information.
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Specification