PRS Configuration Switching for Positioning Continuity in Handover
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Solution Overview
Problem
Existing wireless communication systems face challenges in maintaining positioning service continuity during handovers between different base stations or cells, particularly in downlink and uplink-based positioning, and switching between different positioning methods.
Innovation Solution
Implementing methods and apparatus that support positioning service continuity by switching from a first PRS configuration to a second PRS configuration after a handover, based on configured PRS configurations associated with different base stations or cells, using threshold values to ensure seamless transitions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the WTRU uses a single PRS configuration for positioning, then the configuration management is simple, but positioning service continuity is interrupted during handover when PRS configuration changes
Solution Approach 1:
The patent segments the PRS configuration into multiple independent configurations (first PRS configuration, second PRS configuration, etc.), each associated with different base stations or cells. The WTRU maintains multiple configurations simultaneously and selectively activates them based on handover events, allowing continuous positioning service while managing complexity through structured organization of configurations.
Solution Approach 2:
The patent implements dynamic switching between different PRS configurations based on handover conditions. The WTRU transitions from a static single configuration to a dynamic multi-configuration system where the active configuration changes according to the serving base station, enabling service continuity during handover while adapting to different network conditions.
2Reliability
If the WTRU switches PRS configuration during handover, then positioning service continuity is maintained, but configuration switching complexity increases
Solution Approach 1:
The patent applies preliminary action by pre-configuring multiple PRS configurations in the WTRU before handover occurs. The WTRU receives and stores multiple PRS configurations from different base stations in advance, so when handover is detected, the appropriate configuration can be switched to immediately without waiting for configuration transmission during the handover process, thus maintaining service continuity while simplifying the switching mechanism.
Solution Approach 2:
The patent implements feedback mechanisms where the WTRU monitors its serving base station and detects handover events. Based on this feedback, the WTRU automatically switches between PRS configurations without requiring manual intervention or complex control signals, reducing the complexity of the switching mechanism while maintaining service continuity.
3Reliability
If multiple PRS configurations are maintained for different base stations, then positioning service continuity during handover is achieved, but the WTRU memory and processing requirements increase
Solution Approach 1:
The patent segments PRS configuration data into distinct, manageable units (first PRS configuration, second PRS configuration) associated with different base stations. This segmentation allows the WTRU to store and process configurations efficiently, organizing the data structure to minimize memory overhead while enabling selective activation during handover without processing all configurations simultaneously.
Solution Approach 2:
The patent applies partial action by maintaining multiple PRS configurations in the WTRU even though not all configurations need to be actively used at the same time. The WTRU stores configurations for multiple base stations in advance but only activates the relevant one during handover, accepting the increased storage requirement as a trade-off for ensuring service continuity and having backup configurations available.
Data Source
AI summary
The disclosure pertains to methods and apparatus for supporting positioning service continuity. One representative method includes receiving, by a wireless transmit/receive unit (WTRU), a configuration for supporting positioning service continuity during a handover. The method additionally includes supporting, by the WTRU, positioning service continuity according to the configuration at least in part by determining one or more transmissions to be performed. The method also includes assisting a radio access network with a data link handover by performing the one or more transmissions according to the configuration.