Decentralized Trunked Radio Channel Allocation via Subscriber Scanning
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Solution Overview
Problem
Decentralized trunked radio communication systems face high latency delays due to the time-consuming process of scanning for idle channels, which is inefficient and results in unacceptably long access times during call setup.
Innovation Solution
A method where subscriber units scan channels to determine if a call of interest is active, then identify and tune to a clear channel, eliminating the need for a control channel and reducing continuous scanning, with base stations communicating through IP links to manage channel changes and ensure efficient channel utilization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If subscriber units continuously scan channels to find idle channels in a decentralized trunked radio system, then channel allocation is achieved without a control channel, but access time increases significantly resulting in high latency delays
Solution Approach 1:
The system performs preliminary actions by having subscriber units monitor and detect active calls on channels before attempting to access them. This preliminary detection prevents collision and eliminates the need for continuous scanning after call initiation, thereby reducing access time while maintaining decentralized operation
Solution Approach 2:
The system implements feedback mechanisms where subscriber units receive information about active calls from other units. This feedback allows units to make informed channel selection decisions without continuous scanning, resolving the contradiction between decentralized operation and reduced access time
Data Source
AI summary
A method and device for allocating a channel in a decentralized trunked radio communication system enables efficient channel utilization. The method includes scanning at a first subscriber unit a plurality of channels to determine whether a call of interest to a first subscriber unit is active in the system (step 410). The plurality of channels is then scanned at the first subscriber unit to identify a first channel that is clear in the plurality of channels after determining that there is no call of interest to the first subscriber unit active in the system (step 415). The first subscriber unit is then tuned to the first channel that is clear (step 420).