Intersystem group call communication system and method
First Claim
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1. In a communication system that includes:
- a first communication system that includes a first set of communication resources, and first resource control means for controlling, at least in part, allocation of the first set of communication resources amongst a first plurality of member communication units; and
a second communication system that includes a second set of communication resources, and second resource control means for controlling, at least in part, allocation of the second set of communication resources amongst a second plurality of member communication units, wherein the first set of communication resources are substantially noncompatible with the second set of communication resources;
a method of establishing communications between;
a first communication unit that is a member of the first plurality of member communication units and that is located within the first communication system; and
a second communication unit that is a member of the first plurality of member communication units and that is located within the second communication system;
the method comprising the step of;
A) providing at least some of the communication units in the first plurality of member communication units, including the first and second communication units, with a commonly shared ID;
B) pre-registering the commonly shared ID with the second communication system as a roaming ID;
C) providing the second communication system with receiver means substantially compatible with at least one of the communication resources of the first communication system to allow the second communication system to monitor at least some communications supported by the first communication system;
D) determining, in the second communication system, that the second communication unit is located within the second communication system;
E) monitoring, in the second communication system using the receiver means, at least one communication resource belonging to the first set of communication resources to detect a first system communication intended, at least in part, for communication units that have at least the commonly shared ID;
F) when the first system communication is detected, allocating in the second communication system a communication resource from the second set of communication resources to be used by the second communication unit to receive at least part of the first system communication.
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Abstract
Communication systems having dedicated communication resources are provided with receivers that monitor the communication resources of other communication systems, and roamers are preregistered in non-home systems. Using this infrastructure, a group call can be sourced in one system and relayed to roamers located in other systems.
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Citations
2 Claims
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1. In a communication system that includes:
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a first communication system that includes a first set of communication resources, and first resource control means for controlling, at least in part, allocation of the first set of communication resources amongst a first plurality of member communication units; and a second communication system that includes a second set of communication resources, and second resource control means for controlling, at least in part, allocation of the second set of communication resources amongst a second plurality of member communication units, wherein the first set of communication resources are substantially noncompatible with the second set of communication resources; a method of establishing communications between; a first communication unit that is a member of the first plurality of member communication units and that is located within the first communication system; and a second communication unit that is a member of the first plurality of member communication units and that is located within the second communication system; the method comprising the step of; A) providing at least some of the communication units in the first plurality of member communication units, including the first and second communication units, with a commonly shared ID; B) pre-registering the commonly shared ID with the second communication system as a roaming ID; C) providing the second communication system with receiver means substantially compatible with at least one of the communication resources of the first communication system to allow the second communication system to monitor at least some communications supported by the first communication system; D) determining, in the second communication system, that the second communication unit is located within the second communication system; E) monitoring, in the second communication system using the receiver means, at least one communication resource belonging to the first set of communication resources to detect a first system communication intended, at least in part, for communication units that have at least the commonly shared ID; F) when the first system communication is detected, allocating in the second communication system a communication resource from the second set of communication resources to be used by the second communication unit to receive at least part of the first system communication.
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2. In a home communication system that includes a set of communication resources, and resource control means for controlling, at least in part, allocation of the set of communication resources amongst a plurality of member communication units, a method of establishing communications between:
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a first communication unit that is a member of the plurality of member communication units and that is located within the home communication system; and a second communication unit that is a member of the plurality of member communication units and that is located within a second communication system, wherein the second communication system includes a second set of communication resources and second resource control means for controlling, at least in part, allocation of the second set of communication resources amongst a second plurality of member communication units, wherein the second set of communication resources are substantially noncompatible with the communication resources of the home system; the method comprising the steps of; A) providing at least the first and second communication units with a commonly shared ID; B) pre-registering the commonly shared ID with the second communication system as a roaming ID; C) providing the second communication system with receiver means substantially compatible with at least one of the communication resources of the home communication system to allow the second communication system to monitor at least some communications sourced by the home communication system; D) monitoring, in the second communication system using the receiver means, at least one communication resource belonging to the home communication system to detect a communication intended, at least in part, for communication units that have at least the commonly shared ID; E) when the communication is detected, allocating in the second communication system a communication resource from the second set of communication resources to be used by the second communication unit to receive at least part of the communication.
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Specification