RTT Positioning Time-Gap Scheduling for Clock-Drift Mitigation
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Solution Overview
Problem
Existing wireless communication systems face challenges in accurately determining the round-trip-time (RTT) due to clock-drift errors between network nodes, such as a user equipment (UE) device and a base station, which affect positioning accuracy.
Innovation Solution
Implementing a system that schedules Sounding Reference Signal (SRS) resource transmission with a configured time-gap to minimize clock-drift errors, using resource configuration information to adjust the timing of SRS exchanges between a UE and a base station, either asynchronously or synchronously, based on thresholds determined by UE capability and bandwidth.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If SRS resource transmission is scheduled without time-gap configuration, then resource utilization is efficient, but clock-drift errors accumulate and reduce RTT measurement precision
Solution Approach 1:
The system performs preliminary configuration of time-gap parameters between SRS resources based on UE capability thresholds before actual RTT measurement occurs. This advance preparation ensures that clock-drift errors are minimized from the outset, allowing accurate RTT measurements without requiring excessive time gaps during operation.
Solution Approach 2:
The system dynamically adjusts the time-gap parameter between SRS resources based on UE capability thresholds. By changing this temporal parameter adaptively, the system optimizes the balance between minimizing clock-drift errors and maintaining efficient resource utilization for different UE devices.
2Adaptability or versatility
If asynchronous SRS resource exchange is used, then flexibility in resource scheduling is improved, but clock-drift errors increase affecting positioning accuracy
Solution Approach 1:
The system implements dynamic switching between asynchronous and synchronous SRS resource exchange modes based on UE capability thresholds and network conditions. This dynamic adaptation allows the system to maintain scheduling flexibility when using asynchronous mode while transitioning to synchronous mode when positioning accuracy is prioritized, effectively balancing both requirements.
3Measurement precision
If clock-drift mitigation through time-gap configuration is implemented, then RTT measurement accuracy is improved, but system complexity increases
Solution Approach 1:
The system implements self-service mechanisms where UEs automatically apply time-gap configurations based on their own capability thresholds without requiring complex network-side coordination for each measurement. This self-configuration approach reduces signaling overhead and system complexity while maintaining improved RTT measurement accuracy through proper time-gap management.
Data Source
AI summary
Disclosed are systems, apparatuses, methods, and non-transitory media for improving user equipment (UE) positioning by reducing round-trip-time (RTT) measurement errors that may result from clock-drift between network nodes. In some aspects, RTT measurement error can be mitigated through modifications to resource signaling schedules at a UE and/or gNB, for example, based on resource configuration information specifying a time-gap for signaling resource transmission.