UE-Specific Aperiodic Positioning Signals for 5G Latency Reduction
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Solution Overview
Problem
Current wireless communication systems face challenges in reducing positioning latency and overhead due to the long periodicity of positioning reference signals (PRSs), especially in 5G NR systems, which can lead to increased system overhead and latency in determining the position of user equipment (UE).
Innovation Solution
Implementing UE-specific aperiodic positioning signals, which are triggered by control information from an anchor node, allowing for reduced latency in positioning by enabling the UE to perform measurements during designated measurement gaps without relying on cell-specific periodic PRSs, and allowing for early termination of beam sweeping based on responses from the UE.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If cell-specific periodic positioning reference signals (PRSs) are used, then positioning coverage is provided to all UEs, but positioning latency and overhead increase due to long periodicity
Solution Approach 1:
The patent segments positioning signals into two types: cell-specific periodic PRSs for general coverage and UE-specific aperiodic positioning signals for targeted positioning. This segmentation allows the system to use periodic signals for broad coverage while employing aperiodic signals on-demand for specific UEs, reducing overall latency and overhead for positioning operations.
Solution Approach 2:
The patent introduces dynamic, on-demand triggering of UE-specific aperiodic positioning signals based on positioning requests from the location server. This dynamic approach allows the system to adapt positioning resource allocation to actual needs, activating positioning signals only when required for specific UEs rather than continuously transmitting periodic signals for all UEs.
2Reliability
If cell-specific periodic positioning reference signals (PRSs) are used, then positioning functionality is maintained, but system overhead increases due to long periodicity requirements
Solution Approach 1:
The patent divides positioning functionality into two segments: cell-specific periodic PRSs that maintain baseline positioning functionality for all UEs, and UE-specific aperiodic positioning signals that provide enhanced positioning capability on-demand. This segmentation preserves reliability through periodic signals while reducing overhead by using aperiodic signals only when needed.
Solution Approach 2:
The patent enables the location server to autonomously determine when positioning is needed and trigger UE-specific aperiodic positioning signals as required. This self-service mechanism allows the system to maintain positioning functionality while intelligently managing resource allocation to minimize overhead.
3Loss of time
If UE-specific aperiodic positioning signals are implemented, then positioning latency is reduced, but device complexity increases due to additional signal types
Solution Approach 1:
The patent introduces control information as an intermediary that triggers UE-specific aperiodic positioning signals. This intermediary mechanism allows the system to coordinate between the location server, anchor nodes, and UEs, enabling on-demand positioning without requiring complex direct interactions between all components, thus managing device complexity while reducing latency.
Solution Approach 2:
The patent establishes preliminary configurations for UE-specific aperiodic positioning signals, including setting up measurement gaps and configuring signal parameters in advance. This preliminary action prepares the system for rapid on-demand positioning, reducing latency when positioning is actually needed while managing complexity through pre-established protocols.
4Measurement precision
If measurement gaps are designated for UE-specific positioning, then positioning accuracy is improved, but communication resources are consumed
Solution Approach 1:
The patent implements dynamic allocation of measurement gaps for UE-specific positioning, activating these gaps only when positioning is required for specific UEs. This dynamic approach improves positioning accuracy when needed while minimizing communication resource consumption by not maintaining continuous measurement gaps for all UEs.
Solution Approach 2:
The patent applies partial action by allocating measurement gaps selectively to only those UEs requiring positioning services at any given time, rather than providing measurement gaps to all UEs continuously. This partial allocation maintains positioning accuracy for served UEs while reducing overall communication resource consumption.
Data Source
AI summary
Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may receive, from an anchor node, control information that triggers a UE-specific aperiodic positioning signal. The UE may perform, to the anchor node, the UE-specific aperiodic positioning signal based at least in part on the control information. The UE may transmit, to the anchor node, a response based at least in part on the UE-specific aperiodic positioning signal. Numerous other aspects are described.