UL/DL Beam Adjustment for Full-Duplex Self-Interference

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Solution Overview

Problem

In wireless communication systems, particularly in 5G NR, there is a need to address the incompatibility of beams for full-duplex communication due to self-interference between concurrent uplink and downlink transmissions, which affects the quality and efficiency of communication.

Innovation Solution

A method and apparatus at the user equipment (UE) and base station are provided to adjust communication by handling incompatible uplink and downlink beams through scheduling information, allowing for full-duplex operations by considering metrics like RSRP and SINR to mitigate self-interference.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If full-duplex communication is implemented with concurrent uplink and downlink transmissions, then communication efficiency and spectrum utilization are improved, but self-interference between beams worsens communication quality

Engineering Contradiction:

Improvecommunication efficiencyVSAvoidself-interference

Core Design Contradiction:

ProductivityVSObject-affected harmful factors

Solution Approach 1:

The patent measures self-interference between uplink and downlink beams and uses this harmful interference information to adjust beam configurations. By converting the harmful self-interference into useful feedback for beam adjustment, the system optimizes beam compatibility while maintaining full-duplex operation, thus resolving the contradiction between communication efficiency and self-interference mitigation

Inventive Principle:

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

Solution Approach 2:

The patent dynamically adjusts beam parameters (such as beam direction, gain, or configuration) based on measured self-interference levels and scheduling information. By changing beam parameters in response to interference conditions, the system maintains optimal communication quality while enabling full-duplex operations

Inventive Principle:

Principle #35Parameter changes

2Object-affected harmful factors

If beam adjustment rules are implemented for incompatible UL/DL beams, then self-interference is reduced, but device complexity increases

Engineering Contradiction:

Improveself-interferenceVSAvoidbeam adjustment complexity

Core Design Contradiction:

Object-affected harmful factorsVSDevice complexity

Solution Approach 1:

The user equipment automatically measures self-interference between beams and applies adjustment rules based on scheduling information without requiring complex external control. The device serves itself by autonomously identifying incompatible beam pairs and adjusting configurations, reducing the need for complex network-side coordination while effectively mitigating self-interference

Inventive Principle:

Principle #25Self-service

Data Source

PatentUS12477544B2Beam adjustment/cancellation rules for non-compatible UL/DL beams

Publication Date: 2025.11.18 QUALCOMM INC

AI summary

A wireless device, such as a user equipment (UE), may receive first scheduling information with first resources for periodic transmissions with a first beam based on a half-duplex mode. The wireless device may receive second scheduling information for second resources associated with a second beam that is incompatible with the first beam for full duplex communication including downlink reception and uplink transmission that overlaps in time. The wireless device may adjust communication in response to the first beam being incompatible with the second beam for the full duplex communication.