Method for patching group of talkers in direct mode utilizing second receiver in dual watch subscriber
Original Publication Date: 2015-Jul-10
Included in the Prior Art Database: 2015-Jul-10
Kucia, Maciej: INVENTOR [+3]
The invention is to use second frequency utilized by second receiver in dual watch subscriber unit to sent patch/dispatch request in direct mode.
Method for patching group of talkers in direct mode utilizing second receiver in dual watch subscriber unit
By Paweł Jurzak, Wojciech Kopciewicz, Maciej Kucia
In direct mode communication users talk to each other directly. Base station is not being used. Each group of users may be assigned to a different radio communication group operating on a different frequency. On incident scene many different groups may need to collaborate with each other and in this case call patching may be beneficial so that all users from different groups can communicate together.
When users have dual watch subscriber units, i.e. devices with at least 2 receivers, the second receiver is tuned to a second frequency reserved for getting patch request messages. Once such a request is received transmitter and first receiver is tuned to the frequency provided in the message. In such way users utilizing direct mode communication may patch/dispatch talk groups without affecting voice communication.
Patch call is a powerful function provided by both trunked and conventional systems to dynamically merge communication groups. It is very useful in some circumstances, like incident scene where many different groups may need to collaborate and talk to each other in real time.
There is no function in direct mode of operation that allows patching communication groups without affecting voice communication. Therefore there is a need to support this feature.
The invention is to use a second frequency utilized by the second receiver in dual watch subscriber unit to send patch/dispatch request in direct mode.
The flow is as follows:
who wants to patch different groups sends a patch request on the second
frequency. The request is received by other dual watch subscriber units on the
Patch request message provides criteria that should be met to join the call, e.g. specific home talk group, specific location, floor, type of radio, etc.
Patch request also contains information about the target frequency.
unit receives patch request on the second receiver. It does not interfere with
potential voice/data call because different frequency is being utilized.
All subscribers that meet provided criteria tune their first receiver and transmitter to the specified target frequency.
3. User who wants to dispatch previously patched communication groups sends dispatch request on the second frequency. The dispatch request is received by other dual watch subscriber units on the second receiver. It triggers an action in the subscribers to go back to the home frequency.
Commander of firefighters would like to patch talk group A (TGA) (fire department) with talk group B (TGB) (the Police). Both institutions are working at the incident scene and utilize direct mode of operation. The commander sends patch request on the second frequency with indication that al...