SRS Transmission Windowing Under DRX for Accurate Positioning

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Solution Overview

Problem

The uncertainty in the transmission time of sounding reference signals (SRS) due to the randomness of active times in terminal devices, leading to unpredictable communication processes and inaccurate neighboring cell measurements, which affects positioning accuracy.

Innovation Solution

Determine a static first time window for SRS transmission based on the discontinuous reception (DRX) on duration timer, and ensure SRS transmission occurs regardless of wake-up signals, allowing predictable positioning measurements.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Use of energy by moving object

If the terminal device transmits SRS only at active time determined by DRX, then power consumption is reduced, but transmission time uncertainty increases

Engineering Contradiction:

Improvepower consumptionVSAvoidtransmission time certainty

Core Design Contradiction:

Use of energy by moving objectVSReliability

Solution Approach 1:

The network device pre-configures a first time window for SRS transmission before the actual transmission occurs. This time window is determined based on the DRX on duration timer and has a static length, allowing the terminal device to know in advance when it should transmit SRS, thereby eliminating transmission time uncertainty while maintaining DRX power-saving operation

Inventive Principle:

Principle #10Preliminary action

2Ease of operation

If the terminal device waits for wake-up signal before transmitting SRS, then transmission timing is controlled, but positioning accuracy decreases due to measurement uncertainty

Engineering Contradiction:

Improvetransmission timing controlVSAvoidneighboring cell measurement accuracy

Core Design Contradiction:

Ease of operationVSMeasurement precision

Solution Approach 1:

The network device pre-configures the first time window for SRS transmission based on the DRX on duration timer. The terminal device transmits SRS within this predetermined window without waiting for dynamic wake-up signals. This allows neighboring cells to know in advance when to expect and measure the SRS, improving measurement accuracy while maintaining operational control

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent extracts the SRS transmission timing from the dynamic wake-up signal mechanism and places it in a predetermined first time window. This separation allows the SRS transmission to ignore wake-up signals and occur at predictable times, enabling accurate neighboring cell measurements for positioning

Inventive Principle:

Principle #2Taking out (Extraction)

3Reliability

If the SRS transmission ignores wake-up signal, then transmission time certainty is improved, but wake-up signal functionality is bypassed

Engineering Contradiction:

Improvetransmission time certaintyVSAvoidwake-up signal response

Core Design Contradiction:

ReliabilityVSAdaptability or versatility

Solution Approach 1:

The patent applies different rules to different signals: the SRS transmission ignores wake-up signals and follows the predetermined first time window, while other uplink transmissions may still respond to wake-up signals. This localized exception ensures SRS transmission time certainty without completely disabling wake-up signal functionality for other purposes

Inventive Principle:

Principle #3Local quality

Data Source

PatentUS12513650B2Wireless communication method and communications apparatus

Publication Date: 2025.12.30 QUECTEL WIRELESS SOLUTIONS CO LTD

AI summary

A wireless communication method and a communications apparatus are provided. The method includes: determining a first time window, where the first time window is a transmission time window of a reference signal, the first time window is determined based on a discontinuous reception (DRX) on duration time, and a length of the first time window is a preset value.