Enhanced talkgroup scan algorithm
First Claim
1. A method for a radio to scan a conventional radio system and a trunked radio system, said conventional radio system emitting an unsquelch code, said trunked system including a control channel and a plurality of trunked channels and emitting subaudible low speed data signals, said trunked system control channel emitting one or more scan markers, each scan marker comprising an outbound signalling word which marks the start of voice activity for the trunked radio system, the method comprising the following steps:
- (a) monitoring the trunked radio system control channel to determine all channel assignments;
(b) thereafter, monitoring all trunked channels;
(c) determining when it is time to monitor the conventional radio system;
(d) when (c) occurs, then saving the identity of the trunked channel currently being received;
(e) when the proper unsquelch code is detected on said conventional radio system, then monitoring the conventional radio system;
(f) determining when it is time to return to the trunked radio system;
(g) when (f) occurs, then returning to the trunked channel saved as in (d).
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Accused Products
Abstract
An enhanced talkgroup scanning algorithm is provided. This algorithm provides an efficient scan function when a unit scan list contains a mixture of trunked talkgroups and conventional channels. This is accomplished by adding a new scanning algorithm for conventional priority groups, and by enhancing the trunking talk group scanning cycle. A novel scanning algorithm for conventional priority groups is used to decrease the audio holes in trunking calls when looking back at a priority conventional channel. When a unit is active on a low priority trunking call and goes over to the priority conventional channel to check for activity, several new steps are taken into consideration when the unit goes back to the trunked system/active trunked call. Based on whether there has been activity on the priority channel, the unit will immediately return to the old voice channel (unsquelched) or revert to the control channel. A novel scanning algorithm for talk groups allows a unit to revert to scanning the conventional groups in the list quicker if there is no activity on the trunked system for any of the trunking groups in the list.
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Citations
18 Claims
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1. A method for a radio to scan a conventional radio system and a trunked radio system, said conventional radio system emitting an unsquelch code, said trunked system including a control channel and a plurality of trunked channels and emitting subaudible low speed data signals, said trunked system control channel emitting one or more scan markers, each scan marker comprising an outbound signalling word which marks the start of voice activity for the trunked radio system, the method comprising the following steps:
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(a) monitoring the trunked radio system control channel to determine all channel assignments; (b) thereafter, monitoring all trunked channels; (c) determining when it is time to monitor the conventional radio system; (d) when (c) occurs, then saving the identity of the trunked channel currently being received; (e) when the proper unsquelch code is detected on said conventional radio system, then monitoring the conventional radio system; (f) determining when it is time to return to the trunked radio system; (g) when (f) occurs, then returning to the trunked channel saved as in (d). - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A radio arranged for scanning a conventional radio system and a trunked radio system according to a method, said conventional radio system emitting an unsquelch code, said trunked system including a control channel and a plurality of trunked channels and emitting subaudible low speed data signals, said trunked system control channel emitting one or more scan markers, each scan marker comprising an outbound signalling word which marks the start of voice channel activity for the trunked radio system, said method comprising the following steps:
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(a) monitoring the trunked radio system control channel to determine all channel assignments; (b) thereafter, monitoring all trunked channels; (c) determining when it is time to monitor the conventional radio system; (d) when (c) occurs, then saving the identity of the trunked channel currently being received; (e) when the proper unsquelch code is detected on said conventional radio system, then monitoring the conventional radio system; (f) determining when it is time to return to the trunked radio system; (g) when (f) occurs, then returning to the trunked channel saved as in (d). - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18)
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Specification