PUCCH Resource Update via MAC-CE for Beam Switch Latency
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Solution Overview
Problem
Wireless communications systems face challenges in improving signal reliability and reducing latency due to power-saving mechanisms that can lead to delayed uplink control information transmissions, especially when user equipment (UE) changes location or orientation, causing beam misalignment and inefficient resource utilization.
Innovation Solution
The proposed solution coordinates physical uplink control channel (PUCCH) resource updates with beam switches, allowing UEs to exit power-saving modes sooner by dynamically updating PUCCH resources via additional signaling, such as MAC-CE or DCI, to align with new beam directions and reduce latency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If power-saving mechanisms are implemented, then energy consumption is reduced, but uplink control information transmission latency increases
Solution Approach 1:
The patent implements dynamic PUCCH resource updates through MAC-CE signaling, allowing the system to adaptively adjust uplink control channel resources based on UE movement and beam changes. This enables the system to exit power-saving modes sooner when needed, reducing latency while maintaining energy efficiency during stable conditions.
Solution Approach 2:
The system changes the timing and resource parameters of PUCCH transmissions dynamically. By updating PUCCH resources via MAC-CE signaling rather than waiting for periodic RRC reconfiguration, the system can quickly adjust transmission parameters in response to beam switches, thereby reducing latency without continuously consuming power.
2Reliability
If PUCCH resources are updated frequently to maintain alignment with beam changes, then transmission reliability improves, but signaling overhead and system complexity increase
Solution Approach 1:
The patent introduces MAC-CE signaling as an intermediary mechanism between RRC configuration and physical layer transmission. This intermediary allows for efficient, lightweight updates of PUCCH resources without triggering full RRC reconfiguration procedures, thereby maintaining reliability while reducing system complexity and signaling overhead.
Solution Approach 2:
The system segments the resource update process into two distinct layers: initial RRC configuration and subsequent MAC-CE updates. This segmentation allows the heavy lifting of resource configuration to be done once via RRC, while faster, lighter MAC-CE signals handle dynamic adjustments, reducing overall complexity.
3Reliability
If PUCCH resources are updated via RRC signaling only, then configuration reliability is high, but response time to beam changes increases
Solution Approach 1:
The patent creates a dynamic resource update mechanism using MAC-CE signaling that complements the static RRC configuration. This allows the system to maintain the reliability of RRC-based initial configuration while achieving fast response times through dynamic MAC-CE updates when beam changes occur.
Solution Approach 2:
The system performs preliminary configuration via RRC signaling to establish reliable baseline PUCCH resources. This preliminary action ensures high reliability for initial setup, while subsequent MAC-CE updates provide rapid adaptation to changing conditions without compromising the established configuration foundation.
Data Source
AI summary
Certain aspects of the present disclosure provide a method of wireless communication by a user equipment (UE), comprising obtaining radio resource control (RRC) signaling configuring the UE with at least one physical uplink control channel (PUCCH) resource, obtaining additional signaling indicating an update to the PUCCH resource, and outputting, for transmission, uplink control information (UCI) using the updated PUCCH resource and the new beam.