5G Positioning Continuity During Handover
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Solution Overview
Problem
In 5G communication systems, uplink positioning services face disruptions when a terminal device hands over to a new cell, as the selected base station may stop measuring the sounding reference signal (SRS), leading to positioning failures and reduced success rates.
Innovation Solution
A communication method where the location management function network element receives identifier information of the target cell after a handover, sends a message to the access network device to request SRS measurement, ensuring continuous positioning service and improving success rates by selecting the appropriate access network device and configuring SRS parameters.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the base station for measuring is selected before terminal handover, then the positioning service can be established initially, but the positioning service is disrupted after handover because the selected base station can no longer measure the terminal
Solution Approach 1:
The LMF network element proactively obtains identifier information of the target cell before the terminal completes handover, and pre-configures the measurement task for the target base station. This preliminary action ensures that when handover occurs, the positioning measurement can continue without interruption.
Solution Approach 2:
The system dynamically updates the base station for measuring based on terminal handover status. The LMF network element receives handover notification, identifies the target cell, and reassigns the measurement task to the appropriate base station covering the target cell, making the measurement system adaptive to terminal mobility.
2Measurement precision
If the LMF network element continuously monitors terminal location after handover, then positioning accuracy is maintained, but system complexity increases due to additional message exchanges and coordination
Solution Approach 1:
The patent extracts only the essential identifier information of the target cell from the handover notification message. The LMF network element processes only this critical information to identify and select the appropriate target base station, rather than processing all handover parameters, thus simplifying the coordination process.
Solution Approach 2:
The LMF network element autonomously handles the entire process of detecting handover, identifying the target cell, selecting the new base station for measuring, and configuring the measurement task. This self-service approach reduces the need for complex inter-network element coordination and manual intervention.
Data Source
AI summary
This application provides a communication method, apparatus, and system, which may be used to position a terminal device in a handover scenario, so that continuity of a positioning service can be maintained, and a positioning success rate can be improved. The method includes: A communication device sends a first message to a location management function network element after determining that a terminal device is handed over to a target cell, where the first message includes identifier information of the target cell, so that the location management function network element receives the first message.