Terminal HARQ Response Timing for NR-V2X Sidelink Reporting

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Solution Overview

Problem

In inter-terminal direct communication in NR-V2X, the processing time for reporting a sidelink HARQ response to a base station is not specified, leading to unrealistic reporting operations and potential terminal cost issues.

Innovation Solution

The base station indicates uplink transmission timing of a HARQ response considering the processing time of the terminal, clarifying the timing for HARQ response reporting.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If the base station indicates uplink transmission timing without considering terminal processing time, then the reporting operation can be performed at any indicated timing, but this leads to unrealistic reporting operations and potential terminal cost issues

Engineering Contradiction:

Improveflexibility in reporting timingVSAvoidrealistic reporting operation

Core Design Contradiction:

Adaptability or versatilityVSReliability

Solution Approach 1:

The patent introduces a parameter called 'processing time' that represents the time required for the terminal to prepare and transmit the HARQ response. By changing the timing parameter from arbitrary base station indication to indication based on terminal processing time, the system achieves realistic reporting operations while maintaining flexibility.

Inventive Principle:

Principle #35Parameter changes

2Ease of manufacture

If processing time for HARQ response reporting is not specified, then terminal cost is reduced, but the base station cannot schedule HARQ responses effectively

Engineering Contradiction:

Improveterminal costVSAvoidHARQ response scheduling efficiency

Core Design Contradiction:

Ease of manufactureVSProductivity

Solution Approach 1:

The terminal determines its own processing time requirements and uses this information to schedule its HARQ response transmission. This self-service approach allows the terminal to autonomously manage its reporting timing based on its actual processing capabilities, eliminating the need for base station micromanagement while maintaining scheduling efficiency.

Inventive Principle:

Principle #25Self-service

3Adaptability or versatility

If the base station indicates uplink transmission timing without considering terminal processing time, then scheduling flexibility is maintained, but the terminal may not be able to complete processing in time

Engineering Contradiction:

Improvescheduling flexibilityVSAvoidprocessing time

Core Design Contradiction:

Adaptability or versatilityVSLoss of time

Solution Approach 1:

The terminal performs preliminary determination of its processing time requirements before the base station schedules the HARQ response transmission. By pre-calculating or pre-determining the processing time needed, the terminal can then request or schedule transmission at an appropriate time, ensuring completion before the indicated timing while maintaining scheduling flexibility.

Inventive Principle:

Principle #10Preliminary action

Data Source

PatentEP4102932B1Terminal and communication method

Publication Date: 2025.11.19 NTT DOCOMO INC

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AI summary

A terminal includes a reception unit that receives a response associated with retransmission control from another terminal via a first channel, a transmission unit that transmits the response associated with retransmission control to a base station via a second channel, and a control unit that determines a timing of transmitting the second channel based on a predetermined time configured between the first channel and the second channel.