Anchor UE Selection via DRX Timing Alignment for Joint Positioning
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Solution Overview
Problem
In wireless communication systems, particularly in 5G networks, there is a challenge in efficiently managing discontinuous reception (DRX) modes for user equipment (UEs) during joint positioning sessions, where accurate timing synchronization is crucial for effective anchor UE selection and positioning measurement coordination.
Innovation Solution
A method where a location server selects an anchor UE based on DRX active time occasions closer to measurement occasions for a joint positioning session, and updates other UEs accordingly, enabling them to perform positioning measurements and share determined locations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If DRX mode is used for power saving, then energy consumption is reduced, but positioning measurement accuracy deteriorates due to timing misalignment
Solution Approach 1:
The location server performs preliminary DRX configuration and anchor UE selection before positioning measurements. It proactively identifies UEs with DRX active times that overlap with measurement occasions and pre-selects them as anchor UEs, ensuring timing alignment is established in advance to maintain measurement accuracy while preserving power-saving benefits
Solution Approach 2:
The system dynamically adjusts DRX parameters (active time occasions, periodicity) and positioning measurement parameters based on UE capabilities and positioning requirements. By changing these parameters, the system optimizes the overlap between DRX active periods and measurement occasions, resolving the contradiction between power saving and measurement accuracy
2Productivity
If anchor UE selection is based on DRX timing alignment, then positioning efficiency is improved, but system complexity increases due to additional coordination requirements
Solution Approach 1:
The location server acts as an intermediary that centralizes DRX configuration management and anchor UE selection logic. It receives DRX configurations from UEs, determines timing alignments, selects appropriate anchor UEs, and coordinates measurements among participating UEs. This intermediary approach improves positioning efficiency while managing system complexity by consolidating coordination functions in a single entity
Solution Approach 2:
Each UE autonomously provides its DRX configuration parameters to the location server, and the system uses these self-provided parameters for anchor selection. The UEs independently manage their own DRX operation based on server instructions, reducing the need for complex real-time coordination and signaling overhead
Data Source
AI summary
Disclosed are techniques for wireless positioning. In an aspect, a user equipment (UE) operating in discontinuous reception (DRX) mode receives, from a location server, an anchor selection update message indicating that the UE has been selected as an anchor UE for a joint positioning session with one or more second UEs, wherein the UE is selected as the anchor UE based at least in part on the UE having DRX active time occasions closer to a plurality of measurement occasions for the joint positioning session than DRX active time occasions of the one or more second UEs, performs positioning measurements for the joint positioning session during one or more measurement occasions that overlap with the DRX active time occasions of the UE, and transmits, to the one or more second UEs, the positioning measurements, a location of the UE determined based on the positioning measurements, or both.