Positioning SRS Transmission in RRC_INACTIVE With Paging Stop Control
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Solution Overview
Problem
Existing 5G communication systems face challenges in terminal positioning accuracy and efficiency, particularly in the RRC_INACTIVE state, due to limitations in SRS transmission for positioning in mobile wireless communication systems.
Innovation Solution
The solution involves transmitting UE Capability Information related to SRS, providing support for SRS in RRC_INACTIVE, and managing SRS transmission based on specific information received from the base station, including stopping SRS transmission upon receipt of a paging message.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If SRS transmission is performed in RRC_INACTIVE state for positioning, then positioning accuracy is improved, but device complexity and power consumption increase
Solution Approach 1:
The network configures SRS transmission parameters in advance through RRCRelease message before the UE enters RRC_INACTIVE state. The UE stores these configuration parameters (including spatialRelationInfo, powerControlParams, etc.) and automatically executes SRS transmission according to the pre-configured conditions without requiring real-time network control, thus improving positioning accuracy while avoiding continuous device-network interaction complexity
Solution Approach 2:
The UE autonomously determines whether to transmit positioning SRS based on pre-configured conditions (such as beam correspondence, spatial relation to SSB/CSI-RS). The device self-manages the SRS transmission process including parameter selection and transmission timing without continuous network intervention, reducing device complexity while maintaining positioning functionality
2Measurement precision
If SRS transmission is continuously performed in RRC_INACTIVE state, then positioning accuracy is improved, but power consumption increases
Solution Approach 1:
The network configures periodic SRS transmission parameters including periodicity and offset values in the RRCRelease message. The UE transmits positioning SRS periodically according to these pre-configured parameters rather than continuously, achieving acceptable positioning accuracy while significantly reducing power consumption during RRC_INACTIVE state
Solution Approach 2:
Transmission stop conditions are predetermined and configured in advance (such as upon receiving paging message, entering RRC_CONNECTED, or completing positioning procedure). The UE automatically stops SRS transmission when these conditions are met, avoiding unnecessary power consumption while maintaining positioning accuracy during active periods
3Productivity
If SRS transmission parameters are pre-configured for RRC_INACTIVE state, then positioning efficiency is improved, but device complexity increases
Solution Approach 1:
The SRS configuration is segmented into multiple independent parameter groups including spatialRelationInfo (linking to SSB or CSI-RS), powerControlParams (openLoop and closedLoop parameters), and resource allocation parameters. Each segment can be independently configured and stored, allowing the UE to manage complexity through modular organization while achieving comprehensive positioning functionality
Solution Approach 2:
The pre-configured SRS parameters are designed to be universally applicable for different positioning scenarios in RRC_INACTIVE state. The same configuration framework supports various spatial relations (to SSB, CSI-RS, or SRS), different periodicities, and multiple transmission conditions, reducing the need for multiple specialized configuration sets and thereby managing device complexity
Data Source
AI summary
A method and apparatus for positioning in a mobile communication system are provided. Method for positioning includes transmitting to a base station a UECapabilityInformation including one or more first capability information related to SRS, transmitting to a LMF a provideCapabilities including one or more second capability information related to support of SRS in RRC_INACTIVE, receiving from the base station a RRCRelease including a first information and a second information and optionally a fourth information, transmitting in a first cell based on the first information and the second information the fourth information a positioning SRS in RRC_INACTIVE and stopping in the first cell the positioning SRS if a paging message including a third information is received.