Sidelink DRX Timer Configuration for Signaling Reduction

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Solution Overview

Problem

In sidelink (SL) communication, the need to align SL DRX cycles and active times among User Equipments (UEs) leads to increased signaling overhead due to frequent transmissions of timer configurations, which can be power-consuming and inefficient.

Innovation Solution

A method for adjusting active times in SL DRX operations based on predefined rules, where UEs determine timer values for InactivityTimer and RetransmissionTimer based on time intervals between resources, allowing implicit alignment of active and inactive times without continuous signaling.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If timer configurations are frequently transmitted to align SL DRX cycles and active times among UEs, then communication reliability is improved, but signaling overhead increases and power consumption rises

Engineering Contradiction:

Improvecommunication reliabilityVSAvoidpower consumption

Core Design Contradiction:

ReliabilityVSLoss of energy

Solution Approach 1:

The patent applies preliminary action by pre-configuring timer values (inactivityTimerSL and retransmissionTimerSL) in the SL DRX configuration message. This allows UEs to determine timer values in advance based on predefined rules and resource time intervals, eliminating the need for frequent subsequent signaling exchanges to adjust timers, thus reducing power consumption while maintaining communication reliability.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent implements self-service by enabling each UE to autonomously determine timer values based on the time interval between scheduled resources and the pre-configured parameters. The receiving UE calculates timer values independently using the formula involving maxTimeValue and the time interval, without requiring continuous network intervention or additional signaling, thereby reducing overall system power consumption.

Inventive Principle:

Principle #25Self-service

2Reliability

If timer configurations are frequently transmitted to align SL DRX cycles and active times among UEs, then communication reliability is improved, but signaling overhead increases

Engineering Contradiction:

Improvecommunication reliabilityVSAvoidsignaling overhead

Core Design Contradiction:

ReliabilityVSLoss of information

Solution Approach 1:

The patent applies preliminary action by incorporating timer configuration information (inactivityTimerSL and retransmissionTimerSL) into the initial SL DRX configuration message. This preliminary configuration enables UEs to autonomously determine subsequent timer values based on predefined rules and actual resource time intervals, eliminating the need for frequent subsequent signaling exchanges to adjust timers, thus reducing signaling overhead while maintaining communication reliability.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

Inventive Principle:

Principle #25Self-service

3Stability of the object's composition

If UEs continuously monitor and adjust DRX timers through signaling, then active time alignment is improved, but power consumption increases

Engineering Contradiction:

Improveactive time alignmentVSAvoidpower consumption

Core Design Contradiction:

Stability of the object's compositionVSUse of energy by moving object

Solution Approach 1:

The patent implements self-service by enabling each UE to autonomously determine and adjust timer values based on the time interval between scheduled resources and pre-configured parameters. The receiving UE independently calculates timer values using the formula involving maxTimeValue and the time interval, without requiring continuous network intervention or additional signaling, thereby reducing overall system power consumption while maintaining active time alignment.

Inventive Principle:

Principle #25Self-service

Solution Approach 2:

The patent applies preliminary action by pre-configuring timer parameters (inactivityTimerSL and retransmissionTimerSL) and the maxTimeValue in the initial SL DRX configuration. This preliminary setup enables UEs to autonomously determine subsequent timer values based on actual resource time intervals, eliminating the need for frequent subsequent signaling exchanges to adjust timers, thus reducing power consumption while maintaining active time alignment.

Inventive Principle:

Principle #10Preliminary action

Data Source

PatentUS20230345575A1Method and device for performing communication in NR v2x on basis of SL drx

Publication Date: 2023.10.26 LG ELECTRONICS INC

AI summary

Provided are a method for a first device to perform wireless communication on the basis of a sidelink (SL) discontinuous reception (DRX) setting, and a device for supporting same. The method may comprise the steps of: receiving first sidelink control information (SCI) for scheduling a physical sidelink shared channel (PSSCH) from a second device through a physical sidelink control channel (PSCCH) on the basis of a first resource within a first active time among a plurality of SL resources, wherein information related to the first active time is included in the SL DRX setting; receiving data and second SCI including a source ID and a destination ID through the PSSCH from the second device; determining the value of a timer related to a second active time on the basis of a threshold value and time intervals between the plurality of SL resources; and initiating the timer related to the second active time.