SRS Switching for Uplink Positioning Signal Transmission
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Solution Overview
Problem
Current wireless communication networks face challenges in accurately performing uplink positioning due to limited bandwidth capabilities of User Equipment (UE) and inefficient utilization of available carriers, particularly in 5G New Radio (NR) systems, where the UE's bandwidth capability is smaller than the base station's bandwidth, leading to suboptimal positioning accuracy and spectrum utilization.
Innovation Solution
Implementing SRS switching configurations that allow the UE to transmit positioning signals on carriers where it does not transmit user data, enabling the use of multiple carriers for positioning measurements, thereby enhancing positioning accuracy and spectrum efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the UE transmits positioning signals only on carriers where user data is transmitted, then the device complexity is reduced, but the positioning accuracy deteriorates due to limited bandwidth capabilities
Solution Approach 1:
The patent segments the uplink transmission by dividing carriers into two types: carriers for user data transmission and carriers for positioning signal transmission. This allows the UE to transmit positioning signals (SRS) on dedicated carriers without user data, separating the positioning function from general data transmission and enabling improved positioning accuracy through additional measurement opportunities.
2Measurement precision
If the UE transmits positioning signals on carriers without user data, then the positioning accuracy is improved, but the spectrum efficiency deteriorates due to carrier switching
Solution Approach 1:
The patent implements periodic SRS switching where the UE alternates between transmitting on data carriers and positioning carriers in a configured pattern. This periodic switching allows the system to balance positioning accuracy requirements with spectrum efficiency by optimizing the duty cycle and timing of positioning signal transmissions on dedicated carriers.
3Measurement precision
If the UE switches between multiple carriers for positioning measurements, then the positioning accuracy is improved through parallel measurements, but the loss of time increases due to switching operations
Solution Approach 1:
The patent applies preliminary action by pre-configuring the UE with SRS switching parameters, carrier frequencies, and transmission timing before positioning measurements begin. This allows the UE to perform carrier switching and positioning signal transmission without real-time decision delays, reducing the time loss associated with dynamic carrier selection and enabling parallel measurements across multiple carriers.
Data Source
AI summary
A method performed by a User Equipment (UE) for transmitting Uplink (UL) signals for positioning purpose in a wireless communications network is provided. The UE receives (302) from a second network node, a UL signal switching configuration, and a UL signal configuration to transmit UL signals for positioning purpose on one or more carriers where the UE does not transmit user data. The UE further receives (303) from the second network node a UL signal switching order. The UE then switches (304) to at least one carrier where the UE does not transmit user data, to transmit the UL signals for positioning purpose. The UE then switches back (305) to a carrier where the UE transmits user data.