MCPTT Terminal Off-Network Call Merging
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Solution Overview
Problem
In public safety networks, existing technologies face challenges in providing efficient off-network Mission Critical Push To Talk (MCPTT) services, particularly in controlling call setup, state changes, and merging calls without central network infrastructure, which is crucial for emergency communication scenarios.
Innovation Solution
A method and terminal implementation that receives and compares group call announcement messages to merge MCPTT calls based on call type, priority, and other parameters, allowing for seamless communication between terminals in off-network situations, using protocols like SIP but with adaptations for quick session establishment and floor control in server-less environments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If off-network PTT-based communication service is implemented without central network infrastructure, then communication reliability in emergency situations is improved, but call setup control and floor management become more complex
Solution Approach 1:
The terminal performs self-service by autonomously comparing group call information and determining whether to merge calls without requiring central network controller intervention. The terminal uses local storage to keep group call information and independently executes merging decisions based on comparison results, enabling reliable off-network communication while maintaining simplified control procedures.
2Area of stationary object
If multiple group calls are merged in off-network situation, then communication coverage is improved, but call state management complexity increases
Solution Approach 1:
The terminal autonomously manages call merging by comparing group call information stored locally with received group call announcement messages. Based on the comparison results, the terminal automatically determines whether to merge calls, thereby expanding communication coverage while keeping the management mechanism simple and distributed without requiring complex centralized coordination.
3Productivity
If group call merging is performed based on information comparison, then call setup efficiency is improved, but information processing requirements increase
Solution Approach 1:
The terminal performs preliminary action by storing group call information locally before needing to merge calls. When a group call announcement message is received, the terminal compares it with pre-stored information to quickly determine merging necessity, thereby improving call setup efficiency while limiting information processing to essential comparison operations rather than comprehensive analysis.
Data Source
AI summary
Disclosed is a method in which a terminal provides a Mission Critical Push To Talk (MCPTT) service. The method includes receiving a group call announcement message by the terminal, which is any one of a plurality of terminals participating in a group call that is set based on the MCPTT service, comparing information regarding a first group call stored in the terminal with information regarding a second group call included in the received group call announcement message, and merging the first group call, in which the terminal is participating, and the second group call, based on a result of the comparison.