RSSI-Based Talkgroup Formation for Public Safety Radios
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Solution Overview
Problem
In public-safety contexts, there is a need for robust and reliable direct-mode communication among responders, particularly in establishing automatic talk groups based on received signal strength indicator (RSSI) to ensure effective communication during incidents.
Innovation Solution
A method and system for automatically creating talk groups by broadcasting a talkgroup invite, receiving responses from other mobile radios, selecting radios based on RSSI values, and establishing a talkgroup for communication, which includes broadcasting a talkgroup invite and selecting mobile radios whose RSSI values meet or exceed a threshold for participation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If manual talk group creation is used, then communication reliability is improved, but device complexity and operational time increase
Solution Approach 1:
The system enables automatic talk group formation where mobile radios autonomously select participants based on RSSI measurements without manual intervention. The initiating radio broadcasts an invite, receives responses with RSSI values, automatically selects radios meeting the threshold criteria, and establishes the talk group, making the system self-configuring and eliminating manual setup complexity
Solution Approach 2:
The patent uses RSSI (received signal strength indicator) as a dynamic parameter to automatically determine talk group membership. By changing from manual selection to automated selection based on RSSI threshold parameters, the system achieves both reliability through objective criteria and reduced complexity through automated decision-making
2Loss of time
If automatic talk group creation based on RSSI is implemented, then operational time is reduced, but communication reliability may worsen
Solution Approach 1:
The system performs preliminary RSSI measurements and threshold evaluations before finalizing talk group membership. By pre-assessing signal strengths and determining which radios meet the threshold criteria in advance, the system ensures reliable communication quality is established before the talk group becomes operational, preventing unreliable connections from forming
Solution Approach 2:
The patent implements a feedback mechanism where mobile radios respond to invites with their RSSI measurements, allowing the initiating radio to evaluate signal strengths and make informed selection decisions. This feedback loop ensures that only radios with adequate signal strength (meeting the threshold) are included, maintaining communication reliability while automating the process
3Reliability
If RSSI threshold filtering is applied, then communication quality is improved, but quantity of participating radios decreases
Solution Approach 1:
The system uses RSSI threshold as a selectable parameter that can be adjusted to balance between communication quality and participant quantity. By making the threshold a configurable parameter rather than a fixed value, the system allows users to optimize the trade-off between including more radios (lower threshold) versus ensuring higher individual connection quality (higher threshold)
Data Source
AI summary
Disclosed herein are methods and systems for automatic creation of talkgroups based on received signal strength indicator (RSSI). In one embodiment, a first mobile radio broadcasts a talkgroup invite and receives responses from other mobile radios. The first mobile radio selects one or more of those other mobile radios based at least in part, for each received response, on one or both of (i) an invite-RSSI value included in the response and associated with receipt of the invite by the mobile radio from which the response was received and (ii) a response-RSSI value associated with receipt by the first mobile radio of the response. The first mobile radio establishes a talkgroup that includes itself and the one or more selected other mobile radios, and communicates as a participant in the established talkgroup.