Positioning SRS Activation During DRX Inactive Time

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Solution Overview

Problem

During the inactive time of the DRX cycle, UEs are not expected to transmit signals to conserve power, leading to inaccurate transmit timing and increased resource consumption, and base station receivers are unable to receive UE signals without blind detection, which is resource-intensive and challenging, especially for multiple UEs.

Innovation Solution

A network node determines whether it can receive UE signals during DRX inactive time and configures the UE to transmit SRS accordingly, allowing or prohibiting SRS transmission based on receiver capabilities, and adapts its receiver to handle SRS signals during inactive time if possible.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If UE transmits SRS during DRX inactive time for positioning measurements, then positioning accuracy is improved, but UE power consumption increases

Engineering Contradiction:

Improvepositioning accuracyVSAvoidUE power consumption

Core Design Contradiction:

Measurement precisionVSUse of energy by moving object

Solution Approach 1:

The patent applies dynamics by making the SRS transmission behavior adaptive rather than static. The UE dynamically adjusts its transmission behavior during DRX inactive time based on received indications from the network node, transitioning between transmission and non-transmission states according to positioning requirements and power saving needs.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The patent changes the transmission parameter state by using network-configured indicators to control whether SRS transmission occurs during DRX inactive time. The network node configures parameters such as transmission activation indicators that change the operational state of SRS transmission, allowing flexible adjustment between positioning accuracy and power consumption.

Inventive Principle:

Principle #35Parameter changes

2Measurement precision

If base station receives UE signals during DRX inactive time, then positioning measurements are improved, but base station resource consumption increases

Engineering Contradiction:

Improvepositioning measurement accuracyVSAvoidbase station resource consumption

Core Design Contradiction:

Measurement precisionVSQuantity of substance

Solution Approach 1:

The patent applies preliminary action by having the network node pre-configure SRS resources and provide activation indications before the UE transmits SRS during DRX inactive time. The base station prepares receiving resources in advance based on network configuration, enabling efficient resource utilization when positioning measurements are actually needed rather than continuously monitoring.

Inventive Principle:

Principle #10Preliminary action

3Measurement precision

If UE transmits SRS during DRX inactive time, then transmit timing accuracy is improved, but resource consumption increases

Engineering Contradiction:

Improvetransmit timing accuracyVSAvoidresource consumption

Core Design Contradiction:

Measurement precisionVSLoss of energy

Solution Approach 1:

The patent applies self-service by enabling the UE to autonomously determine whether to transmit SRS during DRX inactive time based on network-configured indicators and local conditions. The UE serves itself by making intelligent decisions about transmission timing and resource usage, balancing timing accuracy requirements with power saving without requiring continuous network control.

Inventive Principle:

Principle #25Self-service

Data Source

PatentEP4193691B1Activating positioning SRS during DRX inactive time

Publication Date: 2026.01.28 TELEFONAKTIEBOLAGET LM ERICSSON (PUBL)

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AI summary

The present application describes devices, systems, and methods for transmitting certain signals by a user equipment, UE (510), during a discontinuous reception, DRX, inactive time. An exemplary method includes receiving configuration information indicating a status associated with a reception, by a radio node, of a sounding reference signal, SRS, during a DRX inactive time and selectively transmitting, to the radio node, the SRS during the DRX inactive time based at least in part on the status.