Terminal Device Area-Based Group Communication
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Solution Overview
Problem
Current communication systems require time-consuming positional identification for group communication in specific areas, making it inefficient to call terminal devices present in a designated location, such as during emergencies.
Innovation Solution
A communication system and method that utilize a terminal device with an acquisition unit for positional information, a storage unit with correspondence relationships between areas and identifiers, a selection unit to match identifiers, and a control unit to initiate communication upon matching identifiers in a call signal, allowing for simplified and efficient group communication by designating areas rather than individual devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If area information is indicated by latitude and longitude for precise positional identification, then measurement precision is improved, but device complexity and ease of operation deteriorate
Solution Approach 1:
The patent divides the geographic area into multiple predefined zones, each assigned a unique identification number. Instead of using continuous latitude and longitude coordinates, the system segments the service area into manageable regions (e.g., zones 101-105), making area designation simpler while maintaining sufficient precision for group communication purposes.
Solution Approach 2:
The patent creates a simplified representation of geographic areas by copying essential identification information (zone IDs) rather than using complete coordinate data. The terminal device stores a correspondence table mapping zone IDs to coordinate ranges, allowing the system to work with simple identifiers while maintaining the ability to accurately identify positions when needed.
2Measurement precision
If individual device identification is used for group communication, then measurement precision is improved, but loss of time increases
Solution Approach 1:
The patent merges multiple individual device identifications into a single area-based identification. Instead of individually identifying each terminal device in a group, the system identifies all terminals within a designated geographic zone using a single zone ID, dramatically reducing the time required to establish group communication while maintaining the ability to reach all relevant devices.
Solution Approach 2:
The patent performs preliminary organization of terminal devices by geographic area before communication is needed. Terminal devices pre-register their locations and associate themselves with specific zones, so when group communication is required, the system can immediately identify all devices in the target area without performing time-consuming individual device searches or selections.
3Measurement precision
If area information is stored in detail for each terminal device, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The patent extracts only the essential identification information (zone ID) from detailed area data and stores it in terminal devices. The complete coordinate information and area boundary definitions are stored centrally in the base station, while terminal devices only keep lightweight zone ID mappings, significantly reducing device complexity while maintaining the ability to perform accurate area-based identification when needed.
Data Source
AI summary
An acquisition unit acquires positional information. A storage unit stores a list in which a plurality of correspondence relationships between an area including positional information that can be acquired in the acquisition unit and an identifier are included. A selection unit selects, from the list stored in the storage unit, an identifier corresponding to the positional information acquired in the acquisition unit. A communication unit receives, from a calling device, a call signal including an identifier to be called. A control unit makes, when the identifier included in the call signal received in the communication unit matches the identifier selected in the selection unit, the communication unit execute communication.