Communication system that avoids co-channel interference
First Claim
1. A trunked radio communication system that avoids co-channel interference, having at least two channel resources and at least two communication units, and also having a coverage area overlapping the coverage area of at least one other communication system, wherein the at least one other communication system is independent from the trunked radio communication system in that the at least one other communication system is under separate and distinct control with respect to the trunked radio communication system, with at least one channel resource in common between the systems, comprising:
- means for receiving transmitted signals from the at least one other communication system on the at least one common channel resource;
means, coupled to said means for receiving, for recording history of usage of the at least one common channel resource; and
means, operatively coupled to said means for recording, for assigning one of said at least two channel resources to at least one of the at least two communication units so as to avoid interference with the at least one common channel resource.
2 Assignments
0 Petitions
Accused Products
Abstract
Co-channel user (129) interference on trunked radio communication systems cannot be compensated for in the same way as conventional radio systems because the communication unit does not know what frequency it will be assigned to until it begins transmitting. Placing an additional receiver (119) in the coverage area (125) of the co-channel user (129) and sending information of recent co-channel usage to the controller (101) allows the controller (101) to decide which channel has the least likelihood of co-channel interference so that it may be assigned.
30 Citations
18 Claims
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1. A trunked radio communication system that avoids co-channel interference, having at least two channel resources and at least two communication units, and also having a coverage area overlapping the coverage area of at least one other communication system, wherein the at least one other communication system is independent from the trunked radio communication system in that the at least one other communication system is under separate and distinct control with respect to the trunked radio communication system, with at least one channel resource in common between the systems, comprising:
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means for receiving transmitted signals from the at least one other communication system on the at least one common channel resource; means, coupled to said means for receiving, for recording history of usage of the at least one common channel resource; and means, operatively coupled to said means for recording, for assigning one of said at least two channel resources to at least one of the at least two communication units so as to avoid interference with the at least one common channel resource. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A method of co-channel interference avoidance in a trunked radio communication system having at least two channel resources and at least two communication units, and also having a coverage area overlapping the coverage area of at least one other communication system, wherein the at least one other communication system is independent from the trunked radio communication system in that the at least one other communication system is under separate and distinct control with respect to the trunked radio communication system, with at least one channel resource in common between the systems, comprising the steps of:
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receiving transmitted signals from the at least one other communication system on the at least one common channel resource; recording, responsive to said step of receiving, history of usage of the at least one common channel resource; and assigning, responsive to said step of recording, one of said at least two channel resources to at least one of the at least two communication units so as to avoid interference with the at least one common channel resource. - View Dependent Claims (9, 10, 11, 12)
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13. A controller in a trunked radio communication system that avoids co-channel interference, having at least two channel resources and at least two communication units, and also having a coverage area overlapping the coverage area of at least one other communication system, wherein the at least one other communication system is independent from the trunked radio communication system in that the at least one other communication system is under separate and distinct control with respect to the controller in the trunked radio communication system, with at least one channel resource in common between the systems, the controller comprising:
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means for accepting received information on transmitted signals from the at least one other communication system on the at least one common channel resource; means, coupled to said means for receiving, for recording history of usage of the at least one common channel resource; and means, operatively coupled to said means for recording, for assigning one of said at least two channel resources to at least one of the at least two communication units so as to avoid interference with the at least one common channel resource. - View Dependent Claims (14, 15)
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16. A method of central controlling in a trunked radio communication system that avoids co-channel interference, having at least two channel resources and at least two communication units, and also having a coverage area overlapping the coverage area of at least one other communication system, wherein the at least one other communication system is independent from the trunked radio communication system in that the at least one other communication system is under separate and distinct control with respect to the trunked radio communication system, with at least one channel resource in common between the systems, comprising the steps of:
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accepting received information on transmitted signals from the at least one other communication system on the at least one common channel resource; recording, responsive to said step of receiving, history of usage of the at least one common channel resource; and assigning, responsive to said step of recording, one of said at least two channel resources to at least one of the at least two communication units so as to avoid interference with the at least one common channel resource. - View Dependent Claims (17, 18)
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Specification