SRS Phase-Continuous Transmission for Accurate 5G UE Positioning
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Solution Overview
Problem
Existing wireless communication systems face challenges in accurately and efficiently transmitting and receiving signals, particularly in next-generation radio access technologies like 5G NR, which require enhanced mobile broadband communication, massive MTC, and Ultra-Reliable and Low Latency Communication (URLLC), especially in scenarios involving vehicle-to-everything (V2X) communication.
Innovation Solution
The method involves a user equipment (UE) receiving sounding reference signal (SRS) configuration information and transmitting SRS based on a time domain window (TDW) to maintain phase continuity, with options for repetition number and size adjustment based on UE capability and mobility, and a base station (BS) receiving SRS for positioning using carrier phase measurement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If SRS is repeatedly transmitted within a time domain window for positioning, then positioning accuracy is improved through carrier phase measurement, but phase discontinuity may occur reducing measurement reliability
Solution Approach 1:
The patent dynamically adjusts the time domain window size and SRS repetition number based on UE mobility state. For high-mobility UEs, the window size is reduced and repetition number decreased to maintain phase continuity, while for low-mobility UEs, larger windows and more repetitions are used to improve positioning accuracy. This dynamic adaptation resolves the contradiction between positioning accuracy and phase continuity reliability.
Solution Approach 2:
The patent changes key parameters including time domain window size, SRS repetition number, and subcarrier spacing based on UE capability and mobility conditions. By adjusting these parameters, the system optimizes the balance between achieving sufficient phase measurements for accurate positioning and maintaining phase continuity across transmissions, thereby resolving the measurement precision vs. reliability contradiction.
2Reliability
If SRS configuration is optimized for high-mobility scenarios, then positioning reliability is improved, but positioning accuracy may deteriorate due to reduced measurement time
Solution Approach 1:
The system dynamically adapts SRS configuration parameters based on real-time UE mobility assessment. For high-mobility scenarios, it uses smaller time domain windows and fewer repetitions to ensure phase continuity and reliability. For low-mobility scenarios, it transitions to larger windows and more repetitions to accumulate sufficient measurements for high accuracy, thus resolving the reliability-accuracy trade-off.
Solution Approach 2:
The patent implements parameter changes by adjusting time domain window size, repetition number, and subcarrier spacing according to UE mobility state and capability. This allows the system to optimize positioning performance for each scenario, achieving both reliability in high-mobility conditions and accuracy in low-mobility conditions.
3Measurement precision
If UE capability for phase continuity maintenance is extended, then positioning accuracy is improved, but UE complexity and power consumption increase
Solution Approach 1:
The UE autonomously reports its phase continuity capability to the network, and the network automatically configures appropriate SRS parameters based on this capability information. This self-service mechanism allows the UE to maintain phase continuity when needed without requiring complex external control, improving positioning accuracy while managing device complexity through capability-based configuration.
Solution Approach 2:
The system adjusts SRS configuration parameters including time domain window size and repetition number based on reported UE capability for phase continuity maintenance. By matching configuration to capability, the system achieves accurate positioning without unnecessarily increasing UE complexity or power consumption.
4Measurement precision
If SRS repetition number is increased to improve positioning accuracy, then measurement precision is improved, but transmission time and power consumption increase
Solution Approach 1:
The patent optimizes the SRS repetition number by adjusting it according to UE mobility state, capability, and positioning requirements. For high-mobility scenarios, fewer repetitions are used with smaller time windows to maintain phase continuity. For low-mobility scenarios, more repetitions are allowed within larger windows to improve accuracy. This parameter optimization resolves the contradiction between measurement precision and transmission time.
Solution Approach 2:
The system dynamically determines the optimal repetition number based on real-time conditions including UE mobility and positioning accuracy requirements. This dynamic adjustment ensures sufficient measurements are taken for accurate positioning while minimizing unnecessary transmissions that would waste time and power.
Data Source
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AI summary
Disclosed, according to various embodiments, are a method by which a terminal performs an operation for measuring the location thereof, and an apparatus for same. Disclosed are a method and an apparatus therefor, the method comprising the steps of: receiving sounding reference signal (SRS) configuration information; and transmitting an SRS on the basis of the SRS configuration information, wherein on the basis of the fact that the SRS configuration information includes information about a time domain window (TDW) for measuring the location of the terminal, the terminal repeatedly transmits the SRS while maintaining phase continuity within the TDW.