Sidelink State Synchronization Using Feedback and DRX Timers

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Solution Overview

Problem

Ensuring consistent understanding between transmitting and receiving end terminals in a sidelink system to maintain reliable sidelink transmission is challenging due to the complex and ever-changing network environment.

Innovation Solution

Implementing a first indication mechanism where terminals exchange sidelink feedback information to synchronize their understanding of a target state, using timers and time ranges based on SL-DRX duration timers to manage active and inactive states, and employing wake-up signals to reduce energy consumption.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Use of energy by moving object

If a wake-up signal is introduced to reduce energy consumption, then energy consumption is reduced, but transmission reliability deteriorates due to inconsistent state understanding between terminals

Engineering Contradiction:

Improveenergy consumptionVSAvoidtransmission reliability

Core Design Contradiction:

Use of energy by moving objectVSReliability

Solution Approach 1:

The patent implements a feedback mechanism where the receiving terminal sends wake-up signal indication information back to the transmitting terminal. This feedback loop ensures both terminals have consistent understanding of the receiving terminal's state (wake-up or sleep), resolving the reliability issue while maintaining energy savings through proper state synchronization.

Inventive Principle:

Principle #23Feedback

2Use of energy by moving object

If terminals enter wake-up or sleep states to save energy, then energy consumption is reduced, but state synchronization between terminals deteriorates

Engineering Contradiction:

Improveenergy consumptionVSAvoidstate synchronization

Core Design Contradiction:

Use of energy by moving objectVSStability of the object's composition

Solution Approach 1:

The transmitting terminal receives wake-up signal indication information from the receiving terminal and uses this feedback to determine whether to transmit sidelink data. This ensures both terminals maintain consistent state understanding, stabilizing the system state composition while energy consumption is reduced through wake-up/sleep cycles.

Inventive Principle:

Principle #23Feedback

Solution Approach 2:

The system performs preliminary state alignment by having the receiving terminal indicate its wake-up signal reception status before actual data transmission occurs. This preliminary feedback ensures both terminals are synchronized before the critical data transmission phase, preventing state-related errors.

Inventive Principle:

Principle #10Preliminary action

Data Source

PatentUS20260059563A1Wireless communication method and terminal device

Publication Date: 2026.02.26 GUANGDONG OPPO MOBILE TELECOMMUNICATIONS CORP LTD

AI summary

A wireless communication method a includes: detecting, by a first terminal, first indication information transmitted by a second terminal, the first indication information being used to indicate that the first terminal is to enter a target state; the target state being used to indicate whether the first terminal starts a first timer, or the target state being used to indicate whether the first terminal receives sidelink data within a first time range; where the first timer is related to a sidelink discontinuous reception duration timer, and the first time range is determined based on the first timer; and transmitting, by the first terminal, sidelink feedback information of the first indication information to the second terminal.