Decoupled Control Resource Pool for Sidelink Collision Avoidance

Solution Overview

Problem

Current wireless communication systems face significant delays and overhead when sidelink data transmissions collide, as they require rescheduling after data message transmission and receipt of a negative acknowledgment, leading to inefficiencies in resource utilization.

Innovation Solution

Implementing a control resource pool that decouples from the data resource pool to sense collisions and gate or stop data transmissions, allowing for immediate detection and reconfiguration of sidelink data transmissions based on feedback messages, thereby preventing collisions before data is sent.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Loss of time

If sidelink data transmissions are performed using shared channel resources without decoupled control, then resource allocation is simpler, but collision detection and rescheduling cause significant delays and overhead

Engineering Contradiction:

Improvetransmission delayVSAvoidresource pool structure

Core Design Contradiction:

Loss of timeVSDevice complexity

Solution Approach 1:

The resource pool is segmented into two distinct parts: a control resource pool for transmitting SCI messages and resource reservations, and a data resource pool for actual sidelink data transmissions. This segmentation allows independent optimization of control signaling and data transmission, enabling early collision detection in the control pool without affecting data pool operations.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Control signaling and resource reservations are performed in advance in the control resource pool before actual data transmissions occur in the data resource pool. This preliminary action enables UEs to detect potential collisions and adjust their transmission plans before committing data resources, thereby reducing latency and overhead from post-collision rescheduling.

Inventive Principle:

Principle #10Preliminary action

2Productivity

If control and data resource pools are coupled, then resource management is more integrated, but collision detection occurs after data transmission leading to inefficiencies

Engineering Contradiction:

Improveresource utilization efficiencyVSAvoidresource pool decoupling

Core Design Contradiction:

ProductivityVSDevice complexity

Solution Approach 1:

The resource pool is segmented into two distinct parts: a control resource pool for transmitting SCI messages and resource reservations, and a data resource pool for actual sidelink data transmissions. This segmentation allows independent optimization of control signaling and data transmission, enabling early collision detection in the control pool without affecting data pool operations.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

UEs monitor the control resource pool for SCI messages from other UEs and provide feedback by detecting resource reservations and potential collisions. This feedback mechanism enables UEs to identify conflicting transmissions before data transmission, allowing them to adjust their resource selection and avoid collisions, thereby improving overall resource utilization efficiency.

Inventive Principle:

Principle #23Feedback

3Reliability

If resource collisions are detected after data transmission, then acknowledgment-based rescheduling ensures reliability, but it introduces significant overhead and latency

Engineering Contradiction:

Improvetransmission reliabilityVSAvoidrescheduling delay

Core Design Contradiction:

ReliabilityVSLoss of time

Solution Approach 1:

Control signaling and resource reservations are performed in advance in the control resource pool before actual data transmissions occur in the data resource pool. This preliminary action enables UEs to detect potential collisions and adjust their transmission plans before committing data resources, thereby reducing latency and overhead from post-collision rescheduling.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

UEs perform preliminary collision detection by monitoring control resource pool for SCI messages and resource reservations from other UEs before transmitting data. By taking preliminary anti-action through early collision detection and avoidance, the system prevents harmful collisions rather than reacting to them after occurrence, thus maintaining reliability while minimizing delay.

Inventive Principle:

Principle #9Preliminary anti-action

Data Source

PatentUS11910359B2Techniques for control resource pool-gated data transmission

Publication Date: 2024.02.20 QUALCOMM INC

AI summary

Methods, systems, and devices for wireless communications are described. A user equipment (UE) may transmit a first sidelink control information (SCI) message during a mini-slot of a control resource pool which is decoupled from a data resource pool for sidelink communications. The first SCI message may indicate a data message to be transmitted on a subchannel of the data resource pool to a second UE, where resources between the control resource pool and the data resource pool are mapped. The UE may receive a feedback message from the second UE for the first SCI message during a second mini-slot of the control resource pool. The feedback message may indicate whether a collision or strong interference was detected for the first SCI message. The UE may determine whether to transmit the data message or retransmit the first SCI message based on the feedback message.