Full-Duplex Sidelink Beam Pair Selection for Self-Interference

Solution Overview

Problem

Using half-duplex beam pairs for full-duplex sidelink communication results in decreased performance due to increased recovery errors, data transfer latencies, and decreased data throughput, as they do not account for self-interference during bi-directional communications.

Innovation Solution

Implement full-duplex beam selection by transmitting and receiving indications of optimized FD beam pairs to reduce self-interference, thereby improving sidelink performance.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Device complexity

If half-duplex beam pairs are used for full-duplex sidelink communication, then device complexity is reduced, but performance deteriorates due to increased recovery errors, data transfer latencies, and decreased data throughput

Engineering Contradiction:

Improvebeam selection complexityVSAvoidcommunication reliability

Core Design Contradiction:

Device complexityVSReliability

Solution Approach 1:

The beam selection process is segmented into two distinct phases: half-duplex beam pair selection for initial connection establishment, and full-duplex beam pair selection for optimized bidirectional communication. This segmentation allows the system to use simpler half-duplex methods when appropriate while transitioning to more complex FD methods when performance requires it.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The beam selection mechanism is made dynamic by allowing transition between half-duplex and full-duplex beam pairs based on communication requirements. The system can adaptively switch between operational modes, selecting FD beam pairs when simultaneous bidirectional communication is needed and HD beam pairs when simpler communication suffices.

Inventive Principle:

Principle #15Dynamics

2Device complexity

If half-duplex beam pairs are used for full-duplex sidelink communication, then device complexity is reduced, but data transfer speed deteriorates due to increased latencies and decreased throughput

Engineering Contradiction:

Improvebeam selection complexityVSAvoiddata transfer speed

Core Design Contradiction:

Device complexityVSProductivity

Solution Approach 1:

The beam selection process is segmented into two distinct phases: half-duplex beam pair selection for initial connection establishment, and full-duplex beam pair selection for optimized bidirectional communication. This segmentation allows the system to use simpler half-duplex methods when appropriate while transitioning to more complex FD methods when performance requires it.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The system changes the operational parameters of beam selection by transitioning from half-duplex to full-duplex beam pairs. This parameter change enables simultaneous transmission and reception on different beams, fundamentally improving data transfer speed and throughput for bidirectional communications.

Inventive Principle:

Principle #35Parameter changes

3Device complexity

If half-duplex beam pairs are used for full-duplex sidelink communication, then self-interference is not addressed, but implementation simplicity is maintained, yet communication quality deteriorates

Engineering Contradiction:

Improvebeam selection complexityVSAvoidself-interference

Core Design Contradiction:

Device complexityVSObject-affected harmful factors

Solution Approach 1:

The beam selection process is segmented into two distinct phases: half-duplex beam pair selection for initial connection establishment, and full-duplex beam pair selection for optimized bidirectional communication. This segmentation allows the system to use simpler half-duplex methods when appropriate while transitioning to more complex FD methods when performance requires it.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent converts the potential harm of self-interference in full-duplex communication into a benefit by using beam pairing technology. By selecting specific transmit and receive beam pairs that spatially separate the communication directions, the system eliminates self-interference while maintaining full-duplex operation, effectively turning a harmful factor into a manageable parameter.

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

Data Source

PatentUS12603687B2Full-duplex beam selection for sidelink communications

Publication Date: 2026.04.14 QUALCOMM INC

AI summary

Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a first user equipment (UE) may transmit, using a sidelink with a second UE, a first indication of one or more candidate full-duplex (FD) beam pairs selected by the first UE for an FD sidelink transmission. The UE may receive, using the sidelink, a second indication that specifies at least part of an FD beam set that includes a first FD beam pair associated with the first UE and a second FD beam pair associated with the second UE, the FD beam set being based at least in part on the one or more candidate FD beam pairs. The UE may communicate with the second UE using the sidelink based at least in part on the FD beam set and the FD sidelink transmission. Numerous other aspects are described.