Sidelink Carrier Aggregation Beam Switching After Primary Carrier Failure

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Solution Overview

Problem

Existing wireless communication systems face challenges in managing beam failure on primary sidelink carriers, leading to increased communication delays and suspension of signaling on secondary sidelink carriers when beam failure recovery procedures are unsuccessful.

Innovation Solution

The UE performs independent beam management procedures per sidelink component carrier, allowing for switching the primary sidelink carrier to a secondary carrier of higher quality before beam failure detection and recovery procedures, using timers to manage beam reselection and random access processes.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If beam failure recovery procedures are performed on the primary sidelink carrier, then beam failure can be detected and recovery attempts can be made, but communication delays increase and signaling on secondary carriers is suspended

Engineering Contradiction:

Improvebeam failure recoveryVSAvoidcommunication delays

Core Design Contradiction:

ReliabilityVSLoss of time

Solution Approach 1:

The patent segments the carrier management functions by allowing independent beam management procedures per sidelink component carrier. When beam failure is detected on the primary carrier, the UE can continue to manage and switch carriers independently without suspending all signaling, thus reducing communication delays while maintaining recovery capability

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent implements preliminary carrier switching before beam failure detection becomes critical. The UE proactively switches the primary sidelink carrier to a secondary carrier of higher quality before the beam failure recovery procedure is fully triggered, preventing the suspension of signaling and reducing communication delays

Inventive Principle:

Principle #10Preliminary action

2Stability of the object's composition

If the UE waits for beam failure detection before switching carriers, then the primary carrier can be stabilized, but communication delays increase when switching is eventually needed

Engineering Contradiction:

Improveprimary carrier stabilityVSAvoidcarrier switching delay

Core Design Contradiction:

Stability of the object's compositionVSLoss of time

Solution Approach 1:

The patent applies preliminary action by implementing proactive carrier switching based on quality measurements before beam failure is definitively detected. The UE monitors secondary carriers and switches to a higher quality secondary carrier in advance, maintaining stability while avoiding delayed switching penalties

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent uses feedback mechanisms where the UE continuously measures the quality of primary and secondary carriers. This feedback enables the UE to make informed decisions about when to switch carriers, balancing stability maintenance with timely switching to avoid delays

Inventive Principle:

Principle #23Feedback

3Reliability

If random access procedure is performed during beam failure recovery, then carrier recovery can be attempted, but signaling continuity is interrupted

Engineering Contradiction:

Improvecarrier recoveryVSAvoidsignaling continuity

Core Design Contradiction:

ReliabilityVSProductivity

Solution Approach 1:

The patent segments the recovery process by allowing the random access procedure to be performed on the new primary carrier while maintaining independent management of secondary carriers. This segmentation enables signaling continuity on secondary carriers even during the recovery process, improving productivity without sacrificing recovery capability

Inventive Principle:

Principle #1Segmentation

Data Source

PatentUS12477360B2Techniques for primary sidelink carrier updating in sidelink carrier aggregation

Publication Date: 2025.11.18 QUALCOMM INC

AI summary

Methods, systems, and devices for wireless communications are described. A user equipment (UE) may transmit a first set of reference signals via a primary sidelink carrier of a sidelink carrier aggregation configuration and a second set of reference signals via one or more secondary sidelink carriers of the sidelink carrier aggregation configuration. The UE may receive, based on the reference signals, a measurement message indicating measurements for a set of beams corresponding to a secondary sidelink carrier of the sidelink carrier aggregation configuration based on a beam failure instance for the primary sidelink carrier. The UE may transmit, via Layer 1 signaling or Layer 2 signaling, a control message indicating to switch the primary sidelink carrier to the set of beams based on the measurements for the set of beams and the beam failure instance for the primary sidelink carrier.