NTN Sidelink Timer Alignment for SL-DRX Delay Mismatch

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Solution Overview

Problem

Existing solutions fail to address the challenge of enhancing sidelink communication in non-terrestrial networks, where the mismatch between the SL-DRX mechanism and the transmission delay in NTN leads to communication failures.

Innovation Solution

A method for sidelink communication that involves determining and indicating timers associated with transmission delays in non-terrestrial networks, allowing terminal devices to adjust their communication protocols accordingly.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If the SL-DRX mechanism is enhanced to support terminal devices in NTN, then the adaptability of the communication protocol is improved, but the transmission delay mismatch causes communication failures

Engineering Contradiction:

ImproveSL-DRX mechanism adaptabilityVSAvoidcommunication reliability

Core Design Contradiction:

Adaptability or versatilityVSReliability

Solution Approach 1:

The patent makes the timer duration dynamic by associating it with the transmission delay in NTN. The first terminal device determines the first timer duration based on the actual transmission delay conditions, allowing the system to adapt to varying delay characteristics different NTN scenarios while maintaining reliable communication.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The patent changes the parameter of timer duration to match the transmission delay characteristics of NTN. By adjusting the first timer's duration parameter to be associated with the specific transmission delay in the NTN environment, the system resolves the mismatch between the SL-DRX mechanism and NTN delay characteristics.

Inventive Principle:

Principle #35Parameter changes

2Reliability

If the timer duration is extended to match NTN transmission delay, then the communication reliability is improved, but the communication efficiency and latency increase

Engineering Contradiction:

Improvecommunication reliabilityVSAvoidcommunication latency

Core Design Contradiction:

ReliabilityVSLoss of time

Solution Approach 1:

The patent optimizes the timer duration parameter by associating it with the actual transmission delay in NTN rather than using a fixed extended duration. This allows the system to achieve the minimum necessary timer duration for reliability while minimizing unnecessary time loss, thus balancing reliability and latency.

Inventive Principle:

Principle #35Parameter changes

Data Source

PatentUS20250393098A1Sidelink communication method, terminal device and network device

Publication Date: 2025.12.25 GUANGDONG OPPO MOBILE TELECOMMUNICATIONS CORP LTD

AI summary

Provided are a sidelink communication method, a terminal device, and a network device. The method comprises: a first terminal device determines a first timer for sidelink communication, a first duration of the first timer being associated with a transmission delay of a non-terrestrial network (NTN) where the first terminal device is located.