Automatic unit ID for quasi-transmission trunked systems
First Claim
1. A two-way trunked communication system including a central control station and a plurality of remote units, each remote unit having a unique, permanent identification code (ID) for identifying the remote unit and at least one group to which it belongs, and comprising:
- request making means in each remote unit for making a request on a first channel for the use of another channel and including in the request the ID of the requesting unit and the ID of the called unit or group, said request being made before each transmission on another channel;
first responding means in the control station for receiving said request and, if a channel is available, making a grant of the use of that channel, the grant being transmitted on the first channel and including the ID'"'"'s of the requesting unit and the called unit or group, and the assigned channel information;
channel switching means in each remote unit for responding to said grant by switching to the granted channel;
timing means in the central control station for timing a predetermined period at the end of each transmission; and
channel reserving means in the central control station for reserving said granted channel for the exclusive use of the requesting and called units during said timed period.
1 Assignment
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Accused Products
Abstract
The system requires the use of the permanent ID of the requesting unit in every channel request made on a control channel before every transmission. The channel grant will include the ID along with the channel number and these may be recorded for possible later reference. A channel assignment is retained for a brief period after each transmission, allowing a conversation to be continued on the same channel without a break. Units can access the control channel with a channel request and be assigned a channel even while the dispatcher is using the voice channel. In the case of a need for communication with a larger group, a dispatcher can form a temporary "patch" group of all involved units, with a temporary ID assigned to that group. A channel request from a member of the larger group must then include, not only the permanent ID of the requesting unit, but the temporary ID of the "patch" group.
74 Citations
11 Claims
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1. A two-way trunked communication system including a central control station and a plurality of remote units, each remote unit having a unique, permanent identification code (ID) for identifying the remote unit and at least one group to which it belongs, and comprising:
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request making means in each remote unit for making a request on a first channel for the use of another channel and including in the request the ID of the requesting unit and the ID of the called unit or group, said request being made before each transmission on another channel; first responding means in the control station for receiving said request and, if a channel is available, making a grant of the use of that channel, the grant being transmitted on the first channel and including the ID'"'"'s of the requesting unit and the called unit or group, and the assigned channel information; channel switching means in each remote unit for responding to said grant by switching to the granted channel; timing means in the central control station for timing a predetermined period at the end of each transmission; and channel reserving means in the central control station for reserving said granted channel for the exclusive use of the requesting and called units during said timed period. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A remote unit as for use in a two-way trunked communication system including a central control station and a plurality of remote units, the central control station including means for receiving a channel request and, if a channel is available, making a grant of the use of that channel, the grant being transmitted on a first channel and including the ID'"'"'s of the requesting unit and the called unit or group, and the assigned channel information, timing means for timing a predetermined period at the end of each transmission, and channel reserving means for reserving said granted channel for the exclusive use of the requesting and called units during said timed period;
- the remote unit comprising;
means for storing a unique, permanent identification code (ID) for identifying the remote unit and at least one group to which it belongs, request making means for making a request on the first channel for the use of another channel and including in the request the ID of the requesting unit and the ID of the called unit or group, said request being made on the first channel before each transmission on another channel; channel switching means in each remote unit for responding to said grant by switching to the granted channel. - View Dependent Claims (9, 10, 11)
- the remote unit comprising;
Specification