Sidelink DRX Timer Maintenance by HARQ Cast Type

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Solution Overview

Problem

The sidelink interface in current communication systems lacks a power-saving mechanism, leading to high power consumption and adversely affecting user experience due to the absence of a Discontinuous Reception (DRX) mechanism.

Innovation Solution

A DRX timer maintenance method is introduced for the sidelink interface, managing timers corresponding to Hybrid Automatic Repeat reQuest (HARQ) processes based on the cast type, including not maintaining, starting, or stopping timers according to specific conditions such as HARQ feedback and retransmission needs.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Use of energy by moving object

If a DRX mechanism is introduced for the sidelink interface, then power consumption is reduced, but device complexity increases

Engineering Contradiction:

Improvepower consumptionVSAvoiddevice complexity

Core Design Contradiction:

Use of energy by moving objectVSDevice complexity

Solution Approach 1:

The patent segments the DRX timer management by cast type (broadcast, groupcast, unicast), applying different timer maintenance strategies to different communication modes. This segmentation allows selective power saving without uniformly increasing complexity across all sidelink operations.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Different timer maintenance policies are applied locally to different cast types: broadcast uses no timer maintenance, groupcast uses conditional maintenance based on HARQ feedback needs, and unicast maintains timers actively. This local differentiation optimizes power consumption per communication mode while managing complexity where necessary.

Inventive Principle:

Principle #3Local quality

2Reliability

If timers are maintained for all HARQ processes, then reliability is improved, but power consumption increases

Engineering Contradiction:

ImprovereliabilityVSAvoidpower consumption

Core Design Contradiction:

ReliabilityVSUse of energy by moving object

Solution Approach 1:

The patent applies partial timer maintenance rather than universal maintenance. Timers are maintained selectively based on cast type and HARQ feedback requirements, avoiding the excessive action of maintaining all timers regardless of actual need, thus balancing reliability with power consumption.

Inventive Principle:

Principle #16Partial or excessive action

Solution Approach 2:

The patent changes the parameter of timer maintenance status based on cast type and HARQ process state. By dynamically adjusting whether timers are maintained, stopped, or started based on communication mode and feedback requirements, the system optimizes the balance between reliability and power consumption.

Inventive Principle:

Principle #35Parameter changes

Data Source

PatentUS12550223B2Discontinuous reception timer maintenance method and user equipment

Publication Date: 2026.02.10 DATANG MOBILE COMM EQUIP CO LTD

AI summary

The present disclosure provides a DRX maintenance method and a UE, and it relates to the field of communication technology. The DRX timer maintenance method applied for the UE includes, with respect to a sidelink interface, managing a timer corresponding to a first HARQ process in accordance with a cast type corresponding to the first HARQ process.