UE Positioning SRS Configuration for Idle-State Collision Avoidance
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently transmitting positioning signals from user equipment (UE) when in an unconnected or inactive state, leading to potential collisions and energy inefficiencies.
Innovation Solution
UEs receive configuration parameters from a communication network to transmit sounding reference signals (SRS) for positioning while in an unconnected or inactive state, utilizing techniques such as randomizing pilot sequences and beamforming to avoid collisions and conserve energy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If UEs transmit positioning signals while in unconnected or inactive state, then positioning capability is improved, but collision probability increases
Solution Approach 1:
The network configures SRS transmission parameters (including time-frequency resources, beamforming vectors, and pilot sequences) in advance while the UE is in connected state. These pre-configured parameters enable the UE to transmit positioning signals in unconnected/inactive states without real-time network coordination, thus avoiding collisions with other UEs' transmissions.
Solution Approach 2:
The patent applies beamforming technology to direct positioning signals toward specific target TRPs using spatial directionality. By configuring UE-specific beamforming vectors and associating them with specific SRS resources, the system creates spatially separated transmission channels that reduce interference and collision probability between different UEs.
2Measurement precision
If UEs transmit positioning signals frequently, then positioning accuracy is improved, but energy consumption increases
Solution Approach 1:
The network configures periodic SRS transmission opportunities with specific time intervals and discontinuous reception (DRX) cycles. UEs transmit positioning signals only at these predetermined periodic intervals rather than continuously, enabling accurate positioning measurements while significantly reducing energy consumption during unconnected and inactive states.
Solution Approach 2:
The system transmits positioning signals only when necessary (at configured periodic intervals) rather than continuously. The network can adjust the transmission frequency and resource allocation to achieve sufficient positioning accuracy while minimizing energy expenditure, especially during inactive states where the UE would otherwise remain silent.
3Ease of operation
If UEs use fixed transmission parameters, then transmission simplicity is improved, but adaptability to different scenarios deteriorates
Solution Approach 1:
The patent implements dynamic SRS transmission parameters including configurable time-frequency resources, adjustable beamforming vectors, and flexible pilot sequences. The network can adaptively configure these parameters based on UE mobility state, service requirements, and network conditions, allowing the same basic mechanism to serve multiple scenarios from idle positioning to active communication.
Solution Approach 2:
The SRS transmission framework is designed to serve multiple functions: positioning in unconnected state, positioning in inactive state, and uplink channel sounding in connected state. By using a unified configurable parameter set that can be adapted to different states and requirements, the system achieves versatility without sacrificing operational simplicity.
Data Source
AI summary
A method of transmitting a sounding reference signal (SRS) for positioning includes: obtaining, at a user equipment (UE), a plurality of SRS transmission parameters; and transmitting SRS for positioning from the UE in accordance with the plurality of SRS transmission parameters while the UE is in an unconnected state, relative to a communication network, or an inactive state.