Sidelink Scheduling Requests Using Reused Feedback Resources

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Solution Overview

Problem

Current wireless communication systems do not efficiently utilize feedback resources for scheduling requests (SRs) in sidelink communications, leading to inefficient use of network resources and unused feedback resources.

Innovation Solution

A procedure for compact scheduling requests (SRs) in sidelink systems, where UEs transmit SRs using feedback resources that would otherwise go unused, allowing for dynamic or static allocation of feedback resources for SR transmission.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If feedback resources are allocated for each sidelink transmission, then reliability of feedback is improved, but resource utilization deteriorates due to unused feedback resources

Engineering Contradiction:

Improvefeedback reliabilityVSAvoidresource utilization efficiency

Core Design Contradiction:

ReliabilityVSLoss of energy

Solution Approach 1:

The feedback resources are designed to serve multiple purposes: they function as feedback channels for acknowledged transmissions and as scheduling request channels when UEs need additional resources. This multi-functionality allows the same resources to be reused across different communication scenarios, improving overall resource utilization while maintaining feedback reliability.

Inventive Principle:

Principle #6Universality (Multi-functionality)

Solution Approach 2:

The system enables UEs to autonomously determine when to use feedback resources for scheduling requests based on their own buffer status and resource needs. The UE self-manages the dual functionality of these resources without requiring separate dedicated scheduling request resources, thereby improving efficiency while maintaining reliability.

Inventive Principle:

Principle #25Self-service

2Reliability

If separate scheduling request resources are allocated, then scheduling request reliability is improved, but device complexity increases due to additional resource management

Engineering Contradiction:

Improvescheduling request reliabilityVSAvoidresource management complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

Inventive Principle:

Principle #6Universality (Multi-functionality)

Solution Approach 2:

The patent combines the feedback resource allocation mechanism with the scheduling request mechanism. Instead of maintaining separate resource pools for feedback and scheduling requests, the system merges these functions into a unified resource structure, reducing the complexity of resource management while preserving the reliability of both functions.

Inventive Principle:

Principle #5Merging (Combining)

3Loss of energy

If feedback resources are reused for scheduling requests, then resource utilization is improved, but ease of operation deteriorates due to resource selection complexity

Engineering Contradiction:

Improveresource utilization efficiencyVSAvoidresource selection simplicity

Core Design Contradiction:

Loss of energyVSEase of operation

Solution Approach 1:

Inventive Principle:

Principle #25Self-service

Solution Approach 2:

The system incorporates feedback mechanisms that provide UEs with information about resource availability and usage status. This feedback enables UEs to make informed decisions about resource selection, simplifying the operation while maintaining high resource utilization efficiency through intelligent, adaptive resource usage.

Inventive Principle:

Principle #23Feedback

4Adaptability or versatility

If multiple feedback resource sets are configured, then adaptability is improved, but device complexity increases due to resource selection overhead

Engineering Contradiction:

Improveresource configuration flexibilityVSAvoidresource selection overhead

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The system dynamically selects from multiple configured feedback resource sets based on current communication conditions, UE buffer status, and resource availability. This dynamic adaptation allows the system to optimize performance for different scenarios while managing complexity through condition-based selection rather than exhaustive resource management.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

Inventive Principle:

Principle #23Feedback

Data Source

PatentUS12621825B2Compact scheduling requests in sidelink

Publication Date: 2026.05.05 QUALCOMM INC

AI summary

Methods, systems, and devices for wireless communications are described. A user equipment (UE) to be scheduled by a scheduler UE in a sidelink system may transmit a first scheduling request (SR) to request sidelink resources. The UE may transmit the first SR via a set of feedback resources. The scheduler UE may transmit, to the UE, a sidelink control message to schedule a sidelink transmission. The sidelink control message may indicate a set of feedback resources mapped to the sidelink transmission. The UE may transmit the scheduled sidelink transmission based on the sidelink control message and may request additional sidelink resources. The UE may transmit a second SR, where the second SR is transmitted via the set of feedback resources mapped to the sidelink transmission.