Non-Serving Cell SRS Configuration for Positioning and Mobility
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Solution Overview
Problem
Conventional cellular networks limit sounding reference signal (SRS) transmission to the serving cell, hindering its use for positioning and inter-cell mobility, as they do not support SRS measurement by non-serving cells.
Innovation Solution
Configuring path loss (PL) and transmission filter (TF) reference signals, such as PL PRS, TF PRS, PL CSI-RS, and TF CSI-RS, to enable SRS transmission to non-serving cells, along with fallback procedures for signal detection failures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If SRS transmission is limited to serving cell only, then network complexity is reduced and reliability is maintained, but adaptability for positioning and inter-cell mobility is hindered
Solution Approach 1:
The patent segments SRS resource configuration into separate configurations for serving cell and non-serving cell. The network can independently configure SRS resources for different target cells, allowing flexible adaptation without requiring complete reconfiguration of the entire SRS system. This segmentation enables selective activation of non-serving cell SRS transmission while maintaining existing serving cell functionality.
Solution Approach 2:
The patent introduces dynamic configuration mechanisms where SRS parameters such as target cell ID, pathloss reference signal, and transmission power can be dynamically adjusted based on network conditions and positioning requirements. The network can flexibly enable or disable non-serving cell SRS transmission and modify configuration parameters in real-time, providing adaptability while maintaining system stability through controlled dynamic changes.
2Adaptability or versatility
If SRS is transmitted to non-serving cells for positioning and mobility, then adaptability is improved, but path loss measurement accuracy deteriorates due to lack of dedicated PL RS
Solution Approach 1:
The patent introduces pathloss reference signals (PL RS) as intermediary reference signals that mediate between the SRS transmission and the non-serving cell. These dedicated PL RS resources provide a reliable reference for path loss calculation, enabling accurate uplink power control even when SRS is transmitted to non-serving cells. The PL RS acts as an intermediary that facilitates precise measurement without requiring direct SRS-referenced path loss estimation.
Solution Approach 2:
The patent enables dynamic parameter changes for SRS transmission by allowing different pathloss reference signal configurations for different target cells. The network can assign specific PL RS resources, adjust pathloss reference power values, and modify SRS transmission power parameters based on the target cell and positioning requirements. These parameter changes enable accurate path loss measurement for each specific non-serving cell target.
3Adaptability or versatility
If multiple PL RS and TF RS configurations are implemented, then adaptability for different cells is improved, but device complexity increases
Solution Approach 1:
The patent implements universal configuration structures where a single SRS resource configuration can serve multiple target cells by referencing different PL RS resources. The same SRS resource can be associated with multiple non-serving cells, each with its own PL RS configuration. This multi-functionality approach allows the system to support multiple cells without requiring completely separate SRS configurations for each cell, thereby reducing overall complexity while maintaining adaptability.
Solution Approach 2:
The patent employs copying mechanisms where PL RS and TF RS configurations can be copied or reused across different SRS resource configurations. Instead of creating entirely new reference signal configurations for each target cell, the network can copy existing PL RS configurations and apply them to multiple SRS resources targeting different cells. This copying approach significantly reduces configuration complexity while maintaining the ability to support multiple cells with appropriate path loss and transmission filter settings.
Data Source
AI summary
Methods and apparatuses are described for configuring a downlink (DL) reference signal (RS) for an electronic device (ED). Configuration information associated with the DL RS is received in a first communication from a location management function (LMF) via LTE positioning protocol (LPP). In a communication from a serving cell via radio resource control (RRC), an identifier (ID) of the DL RS and a cell ID of a cell that originates the DL RS are received. The configuration information received in the first communication also includes the ID of the DL RS and the cell ID. A sounding reference signal (SRS) is transmitted to the cell identified by the cell ID, according to path loss (PL) information or spatial domain transmission filter (TF) information associated with the DL RS.