UE Multi-RTT Positioning Measurement Continuation During Cell Change
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Solution Overview
Problem
Current UE behavior under cell change during multi-RTT positioning measurements is not well defined, leading to severe degradation in positioning measurement performance and potential abortion of ongoing positioning sessions.
Innovation Solution
The UE is configured to perform multi-RTT positioning measurements using two procedures: P1, where the UE restarts measurements after each cell change, and P2, where the UE continues ongoing measurements after a cell change, extending the measurement period based on the number and duration of cell changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the UE restarts multi-RTT positioning measurements after each cell change (Procedure P1), then measurement reliability is improved, but measurement duration increases and positioning efficiency deteriorates
Solution Approach 1:
The patent applies dynamics by making the measurement procedure adaptive - the UE dynamically switches between Procedure P1 (restart measurements) and Procedure P2 (continue measurements) based on whether cell change information is received during the measurement period. This dynamic adjustment optimizes both reliability and timing efficiency depending on the specific cell change scenario.
Solution Approach 2:
The patent changes the measurement procedure parameter based on cell change conditions. When cell change information is received, the UE transitions from P1 to P2, extending the measurement period appropriately. This parameter change allows the system to maintain reliability while reducing unnecessary measurement restarts and associated time losses.
2Measurement precision
If the UE extends the measurement period to account for cell changes (Procedure P2), then positioning accuracy is maintained, but measurement complexity increases
Solution Approach 1:
The patent segments the measurement procedure into two distinct procedures (P1 and P2) with clear differentiation criteria. Procedure P1 applies when no cell change information is received, while Procedure P2 applies when cell change information is received. This segmentation simplifies the decision logic and reduces overall system complexity despite the extended measurement period.
Solution Approach 2:
The patent introduces cell change information as an intermediary signal that mediates the choice between P1 and P2 procedures. This intermediary provides a clear, objective criterion for procedure selection, simplifying the control logic and reducing measurement procedure complexity while maintaining positioning accuracy through appropriate period extension.
3Stability of the object's composition
If the UE continues ongoing measurements during cell changes without restarting (Procedure P2), then positioning session stability is improved, but measurement reliability may deteriorate
Solution Approach 1:
The patent makes the measurement continuation decision dynamic rather than static. The UE evaluates cell change information in real-time and dynamically adjusts between restarting measurements (P1) and continuing measurements (P2). This dynamic approach maintains session stability while preserving measurement reliability by selecting the appropriate procedure based on current conditions.
Solution Approach 2:
The patent implements feedback through cell change information that informs the UE's measurement procedure selection. This feedback mechanism allows the system to adjust measurement behavior based on actual cell change conditions, maintaining both session stability and measurement reliability by providing continuous information about the radio environment state.
Data Source
AI summary
A method performed by a UE (102) that is being served by at least a first cell. The method includes the UE performing a multi round-trip-time, multi-RTT, positioning measurement (e.g., a UE Rx-Tx measurement), wherein the UE is configured with SRS for the measurement with respect to a second cell. The method also includes the UE detecting a need to change a serving cell. The method further includes, as a result of detecting the need to change a serving cell, the UE deciding whether to restart or continue performing the multi-RTT measurement. The UE is configured such that the UE continues the multi-RTT measurement if the serving cell change is for a cell different than the second cell in which the UE is configured with the SRS for the measurement).