Communication Device Status Notification Location Reporting
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Solution Overview
Problem
Public safety communication devices face challenges in meeting stringent key performance indicators (KPIs) for message timing and location reporting, as they must immediately transmit status notification messages while also including location information, which can be delayed due to the time required to retrieve GPS location data on broadband channels.
Innovation Solution
The communication devices implement a method to transmit two status notification messages: one immediately with the last known location and a second with the current location once determined, ensuring timely message transmission and accurate location reporting by using a combination of last known and current location data.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the communication device waits to retrieve current GPS location data before transmitting the status notification message, then location reporting accuracy is improved, but message transmission timing deteriorates (delayed transmission)
Solution Approach 1:
The system performs preliminary actions by storing the last known location data before the status notification event occurs. When a status notification event is detected, the device immediately transmits the pre-stored last known location data without waiting for current GPS data retrieval, thus meeting the stringent message timing KPI while still providing location information.
Solution Approach 2:
The system introduces an intermediary solution by using last known location data as a substitute for current location data when timing constraints prevent immediate GPS retrieval. This intermediary approach allows the device to meet both KPIs by transmitting acceptable location information (last known) when current location cannot be obtained in time.
2Loss of time
If the communication device transmits the status notification message immediately without waiting for location data, then message transmission timing is improved, but location reporting accuracy deteriorates (no current location data)
Solution Approach 1:
The system performs preliminary actions by continuously updating and storing the last known location data in memory before status notification events occur. This pre-prepared data enables immediate transmission with location information when timing constraints are critical, resolving the contradiction between speed and accuracy.
3Measurement precision
If the communication device retrieves current GPS location data on broadband channels, then location reporting accuracy is improved, but message transmission timing deteriorates (retrieval time delay)
Solution Approach 1:
The system performs preliminary actions by maintaining the last known location data in storage continuously updated from previous GPS retrievals. When a status notification event occurs, this pre-stored data is immediately available for transmission without requiring new GPS data retrieval, thus eliminating the retrieval time delay while maintaining reasonable location accuracy.
Solution Approach 2:
The system introduces an intermediary solution by using last known location data as a substitute when current GPS data retrieval would cause unacceptable delays. This intermediary approach allows the device to meet both KPIs by transmitting acceptable location information (last known) when current location cannot be obtained in time.
Data Source
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AI summary
A process for operating a communication device to provide location information within status notification messages. The communication device detects a status notification event and responsively retrieves, from a memory, a last known location of the communication device and a timestamp of the last known location. The communication device generates a status notification message including a status code corresponding to a detected status of a user of the communication device, the last known location of the communication device, the timestamp of the last known location, and a unique identifier identifying the status notification message. The status notification message is then transmitted from the communication device to at least one other communication device or a status notification server.