Conditional SRS Resource Selection for RRC-Inactive UE Positioning
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Solution Overview
Problem
Existing wireless communication systems face challenges in accurately positioning user equipment (UE) in a radio resource control (RRC) not-connected state, particularly in 5G networks, due to inefficiencies in managing sounding reference signal (SRS) resources.
Innovation Solution
The method involves configuring and selecting a subset of SRS resources based on signal strength measurements and association information, allowing UE to transmit only the selected subset while in an RRC not-connected state, and enabling TRP to detect and measure these resources effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If all SRS resources are transmitted in RRC not-connected state, then positioning coverage is improved, but signaling overhead and network processing burden increase
Solution Approach 1:
The patent segments the SRS resource transmission by introducing a subset selection mechanism. The UE selects only a subset of pre-configured SRS resources based on downlink signal strength measurements, rather than transmitting all configured resources. This segmentation reduces the quantity of uplink signaling while maintaining positioning coverage across different cells.
Solution Approach 2:
The patent applies partial action by having the UE transmit only a subset of SRS resources rather than all configured resources. The subset size and selection are optimized to provide sufficient positioning information without excessive signaling overhead, achieving the right balance between coverage and overhead.
2Reliability
If SRS resources are transmitted in RRC not-connected state, then positioning capability is improved, but UE power consumption increases
Solution Approach 1:
The patent segments the SRS transmission workload by selecting only a subset of resources for transmission. This reduces the total transmission power and energy consumption compared to transmitting all pre-configured SRS resources, while still maintaining adequate positioning capability through the selected subset.
Solution Approach 2:
The patent changes the transmission parameters dynamically by adjusting which SRS resources are transmitted based on downlink signal strength measurements. The UE adapts its transmission behavior by selecting resources associated with stronger downlink signals, optimizing energy efficiency while maintaining positioning accuracy.
3Measurement precision
If conditional SRS transmission is implemented, then positioning accuracy is improved, but measurement and selection complexity increases
Solution Approach 1:
The patent applies preliminary action by pre-configuring multiple SRS resources associated with different cells before the positioning measurement phase. The UE already has the association information stored, so during positioning it only needs to perform simple downlink signal strength measurements and select from pre-defined options, reducing real-time complexity while improving accuracy through conditional selection.
Data Source
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AI summary
Disclosed are techniques for wireless communication. In an aspect, a user equipment (UE) may receive configuration information for one or more sounding reference signal (SRS) resource sets associated with one or more cells in an SRS validity area. The UE may select a subset of one or more SRS resources of an SRS resource set associated with a first cell of the one or more cells based on one or more signal strength measurements of one or more downlink reference signals and association information of the one or more downlink reference signals with respect to the first cell and the one or more SRS resources. The UE may transmit, while operating in a radio resource control (RRC) not-connected state, only the selected subset of the one or more SRS resources from all the SRS resources associated with the first cell.