Sidelink Resource Approval for Reliable Terminal Transmission

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Solution Overview

Problem

In resource allocation mode 1 of sidelink communication, the base station's inability to schedule resources based on terminal-specific sidelink states hinders improvements in reliability, delay performance, and resource utilization efficiency.

Innovation Solution

A terminal autonomously selects a resource for sidelink transmission and reports this selection to the base station, which then approves or disapproves the use of the resource, allowing the terminal to perform transmission only if approved.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the base station schedules sidelink resources autonomously without terminal feedback, then the scheduling complexity at the terminal is reduced, but the base station cannot make informed decisions about terminal-specific sidelink states, leading to degraded reliability and resource utilization efficiency

Engineering Contradiction:

Improvesidelink communication reliabilityVSAvoidbase station awareness of terminal sidelink state

Core Design Contradiction:

ReliabilityVSLoss of information

Solution Approach 1:

The terminal performs sensing to detect sidelink resources and generates sensing results, then reports these results to the base station. This feedback mechanism enables the base station to make informed scheduling decisions based on actual terminal-specific sidelink states, thereby improving reliability and resource utilization without requiring the terminal to autonomously select resources.

Inventive Principle:

Principle #23Feedback

2Productivity

If the terminal autonomously selects sidelink resources without base station approval, then the resource allocation speed increases, but the base station loses control over resource utilization, leading to degraded resource utilization efficiency

Engineering Contradiction:

Improveresource allocation speedVSAvoidbase station control over sidelink resources

Core Design Contradiction:

ProductivityVSLoss of information

Solution Approach 1:

The terminal performs sensing and selects candidate resources in advance, then reports these pre-selected resources to the base station for approval. This preliminary action allows the base station to review and control the resource selection while the terminal is prepared to quickly allocate resources upon approval, thus maintaining both speed and control.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The terminal reports sensing results and selected resources to the base station, which then provides approval or rejection feedback. This feedback loop enables the base station to maintain control over resource utilization while the terminal operates with knowledge of approved resources, improving resource utilization efficiency without sacrificing allocation speed.

Inventive Principle:

Principle #23Feedback

3Reliability

If the terminal reports detailed sensing results to the base station, then the base station can make more informed scheduling decisions, but the signaling overhead increases, leading to degraded delay performance

Engineering Contradiction:

Improvescheduling decision accuracyVSAvoidsignaling delay

Core Design Contradiction:

ReliabilityVSLoss of time

Solution Approach 1:

The terminal extracts and reports only the essential sensing results and selected resource information to the base station, rather than reporting all detailed sensing data. This extraction of critical information enables the base station to make informed scheduling decisions while minimizing signaling overhead and associated delays.

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The terminal reports a subset of sensing results that are most relevant for base station scheduling decisions, rather than reporting complete sensing data. This partial reporting approach provides sufficient information for reliable scheduling while reducing signaling time and improving delay performance.

Inventive Principle:

Principle #16Partial or excessive action

Data Source

PatentUS12581476B2Terminal and communication method

Publication Date: 2026.03.17 NTT DOCOMO INC

AI summary

A terminal includes: a control unit configured to select a resource used for sidelink transmission; a transmission unit configured to report information indicating the selected resource to a base station; and a reception unit configured to receive, from the base station, information indicating approval or disapproval for using the selected resource. The transmission unit performs transmission to another terminal using the selected resource in a case where the reception unit receives approval for using the selected resource.