Multi-Cell SRS Configuration for Uplink Positioning Measurements
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Solution Overview
Problem
Existing wireless communication systems lack the capability for multi-cell sounding reference signal (SRS) measurement, limiting applications such as UL-based positioning and mobility, as SRS is currently configured only for serving cells and does not account for neighboring cells or NR LMUs.
Innovation Solution
The proposed solution involves configuring user equipment (UE) to receive downlink reference signals from non-serving cells or NR LMUs, using spatial domain transmission filters and pathloss estimates based on these signals to transmit SRS, enabling multi-cell measurement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If SRS is configured only for serving cells, then the system maintains simple configuration and serving cell measurements, but multi-cell measurement capabilities for positioning and mobility are limited
Solution Approach 1:
The SRS resource configuration is extended to support multiple cells (serving cell and neighbor cells) and NR LMUs using a unified configuration framework. The same SRS resource can be measured by multiple network entities, enabling universal applicability for positioning, mobility, and channel quality measurement across different cell types without requiring separate dedicated configurations for each entity type.
Solution Approach 2:
The SRS resource set is divided into multiple SRS resources, where each SRS resource can be associated with a specific target cell or NR LMU through configuration parameters. This segmentation allows the system to maintain individual measurement capabilities for each target while using a unified SRS transmission mechanism, resolving the contradiction between multi-cell versatility and configuration simplicity.
2Reliability
If SRS is transmitted with higher power to ensure adequate signal strength for multi-cell measurement, then measurement reliability improves, but uplink interference increases
Solution Approach 1:
The SRS transmission power is optimized locally for each target cell or NR LMU based on the specific pathloss and channel conditions to that target. The UE calculates separate pathloss values for different targets and adjusts SRS power accordingly, ensuring adequate signal strength for reliable measurement at each target while minimizing unnecessary high power transmission that would cause interference to other cells.
Solution Approach 2:
The system implements feedback mechanisms where network entities report measurement results and quality indicators back to the UE. Based on this feedback, the UE can dynamically adjust SRS transmission power for different targets, maintaining reliable measurements while reducing power (and thus interference) when measurement quality is already sufficient or when transmission to certain targets is not currently needed.
Data Source
AI summary
Aspects of the present application provide methods and devices in a communication network that aid in implementing sounding reference signal (SRS) measurement by multiple cells (i.e. serving cells and non-serving cells, also known as “neighbor cells”) as well as NR LMUs. This enhanced SRS measurement based on multiple cell and/or NR LMU measurements may facilitate more beneficial usages such as UL-based positioning and UL-based mobility.