NR Sidelink Periodic Resource Re-Selection to Prevent Collisions

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Solution Overview

Problem

In New Radio (NR) SideLink (SL) resource selection, periodically reserved resources by a Transmitter User Equipment (TX UE) may not be real reserved resources for surrounding UEs, leading to resource collisions and interference due to the inability of surrounding UEs to detect periodic resources during selection.

Innovation Solution

Implementing resource selection re-evaluation, pre-emption detection, resource re-selection, and exclusion mechanisms for periodic resources based on preset conditions to ensure accurate resource allocation and reduce collisions.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If periodic resources are reserved by TX UE, then resource allocation efficiency is improved, but resource collision and interference occur because surrounding UEs cannot detect these periodic resources

Engineering Contradiction:

Improveresource allocation efficiencyVSAvoidresource collision avoidance

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

The patent applies preliminary action by having the TX UE send reservation signaling before the actual resource usage to inform surrounding UEs of upcoming periodic resources. This advance notification allows surrounding UEs to detect and avoid these resources during their own resource selection process, preventing collisions while maintaining the efficiency benefits of periodic resource reservation.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent implements feedback mechanisms where surrounding UEs monitor for reservation signaling from TX UEs and adjust their resource selection accordingly. This feedback loop ensures that resource allocation decisions are coordinated between multiple UEs, preventing collisions while maintaining high resource utilization through periodic reservation patterns.

Inventive Principle:

Principle #23Feedback

2Loss of time

If reservation signaling is sent before resource monitoring window, then resource pre-allocation is achieved, but surrounding UEs fail to detect periodic resources causing interference

Engineering Contradiction:

Improveresource pre-allocation timeVSAvoidperiodic resource detection

Core Design Contradiction:

Loss of timeVSLoss of information

Solution Approach 1:

The patent uses preliminary action by sending reservation signaling in advance of the resource monitoring window, allowing TX UEs to pre-allocate periodic resources. This advance signaling ensures that surrounding UEs have sufficient time to detect and record these reserved resources before they need to make their own resource selection decisions.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent applies beforehand cushioning by creating a time buffer between the reservation signaling and the actual resource usage. This cushioning period allows surrounding UEs to reliably detect and process the reservation information without rushing their detection process, ensuring no periodic resources are missed during resource selection.

Inventive Principle:

Principle #11Beforehand cushioning (Prior cushioning)

3Adaptability or versatility

If no periodic resources are reserved for next period, then resource flexibility is improved, but surrounding UEs cannot detect resources causing resource collision

Engineering Contradiction:

Improveresource flexibilityVSAvoidresource collision avoidance

Core Design Contradiction:

Adaptability or versatilityVSReliability

Solution Approach 1:

The patent applies dynamics by making the periodic resource reservation flexible rather than fixed. TX UEs can dynamically adjust whether to reserve periodic resources for future periods based on current channel conditions, traffic requirements, and interference levels. This dynamic approach maintains adaptability while ensuring that when periodic resources are reserved, they are properly signaled to surrounding UEs to prevent collisions.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The patent uses parameter changes by allowing TX UEs to modify reservation parameters such as the reservation period, resource pool, and signaling timing based on current system conditions. This enables the system to balance between resource flexibility and collision avoidance by adjusting parameters rather than following a rigid periodic reservation scheme.

Inventive Principle:

Principle #35Parameter changes

Data Source

PatentUS12532344B2Resource selection method and apparatus, and electronic device

Publication Date: 2026.01.20 VIVO MOBILE COMM CO LTD

AI summary

A resource selection method and apparatus, and an electronic device, are provided. The resource selection method includes: performing, by a sending terminal, any one of the following operations on periodic resources selected and/or reserved by the sending terminal: performing resource selection re-evaluation on the periodic resources in a case that a preset re-evaluation condition is met; using an independent parameter for resource pre-emption detection of the periodic resources in a case that a preset resource pre-emption detection condition is met; releasing the periodic resources and/or performing resource re-selection from the periodic resources in a case that a preset resource selection triggering condition is met; and excluding the periodic resources from a candidate resource set in a case that a preset resource exclusion condition is met.