Positioning-Only UE SRS Configuration in 5G Random Access
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Solution Overview
Problem
Current wireless communication systems, particularly in the context of 5G, face challenges in efficiently managing positioning-only user equipment (UE) operations, including the configuration and transmission of sounding reference signals (SRS) for uplink-only positioning sessions, which affects spectral efficiency and latency.
Innovation Solution
A method and apparatus for a user equipment (UE) to transmit a positioning-only message to a base station, receive an SRS configuration, and transmit SRS on specified time and frequency resources, optimizing the UE's positioning operations within the 5G wireless communication system.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If positioning-only UEs perform full random access procedure, then positioning sessions can be established, but spectral efficiency deteriorates due to unnecessary signaling overhead
Solution Approach 1:
The patent extracts and removes unnecessary full random access procedure steps for positioning-only UEs, retaining only the essential message transmission and SRS configuration steps. This selective extraction eliminates redundant signaling overhead while preserving the core positioning functionality, thereby improving spectral efficiency without compromising positioning session establishment reliability
Solution Approach 2:
The random access procedure is segmented into two distinct types: full random access procedure for general UEs and simplified random access procedure for positioning-only UEs. This segmentation allows the system to apply different levels of procedural complexity based on UE type, optimizing spectral efficiency for positioning-only UEs while maintaining full functionality for other UE types
2Productivity
If positioning-only UEs use simplified random access procedure, then spectral efficiency improves, but latency may increase due to reduced procedure steps
Solution Approach 1:
The base station performs preliminary actions by pre-configuring SRS parameters and preparing positioning session resources before the simplified random access procedure completes. This preliminary preparation eliminates bottlenecks in the simplified procedure, ensuring that time is not lost despite the reduced number of steps, thereby maintaining low latency while achieving improved spectral efficiency
3Measurement precision
If base station configures SRS for positioning-only UE, then positioning accuracy improves, but device complexity increases due to additional configuration requirements
Solution Approach 1:
The SRS configuration mechanism is designed with universality, allowing the same configuration framework to serve both full random access UEs and positioning-only UEs. The base station uses a unified approach to configure SRS parameters, making the additional configuration requirements for positioning-only UEs manageable through standardized procedures rather than requiring entirely new complex configuration systems
Data Source
AI summary
Disclosed are techniques for wireless positioning. In an aspect, a user equipment (UE) transmits, to a base station, a first message of a random access procedure, the first message indicating that the UE is a positioning-only UE, receives, from the base station, in response to transmission of the first message, a sounding reference signal (SRS) configuration for the UE, the SRS configuration indicating one or more time and frequency resources on which the UE is expected to transmit SRS for an uplink-only positioning session, and transmits the SRS on the one or more time and frequency resources based on the SRS configuration.