Uplink Resource Management for MPE Events in Wireless Systems
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Solution Overview
Problem
Current wireless communication systems face challenges in efficiently managing uplink transmission resources, particularly when maximum permissible exposure (MPE) events occur, leading to unavailable physical uplink control channel (PUCCH) resources, which can cause beam failures and disrupt communication.
Innovation Solution
A method where user equipment (UE) identifies MPE events and initiates a physical random access channel (PRACH) procedure to transmit uplink messages when PUCCH resources are unavailable, selecting from contention-based, contention-free, or two-step PRACH types based on availability, and uses an MPE-dedicated PUCCH resource or a new beam to ensure successful transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If PUCCH resources are used for transmitting scheduling requests, then uplink transmission resource management is simplified, but communication reliability deteriorates when MPE events occur causing beam failures
Solution Approach 1:
The patent segments uplink transmission resources into multiple types: PUCCH resources for normal operation and PRACH resources for MPE event scenarios. This segmentation allows the system to switch between different resource types based on beam availability, preventing complete communication failure when MPE events occur.
Solution Approach 2:
The patent changes the transmission resource parameter dynamically based on beam failure detection. When an MPE event is detected, the system transitions from using PUCCH resources to using PRACH resources, altering the transmission parameters to maintain communication reliability under degraded conditions.
2Reliability
If PRACH procedure is initiated to bypass unavailable PUCCH resources, then communication reliability improves, but resource efficiency deteriorates due to additional signaling overhead
Solution Approach 1:
The patent implements preliminary action by pre-configuring both PUCCH and PRACH resources before MPE events occur. This allows the UE to immediately switch to pre-prepared alternative resources when beam failures are detected, avoiding the need for resource allocation negotiations during critical failure scenarios and reducing signaling overhead.
3Adaptability or versatility
If multiple PUCCH resources are configured for different beams, then adaptability to beam failures improves, but device complexity increases due to resource management overhead
Solution Approach 1:
The patent makes PRACH resources universal by configuring them to serve multiple purposes: they can be used for initial access, for MPE event reporting, and as fallback resources when PUCCH resources become unavailable. This multi-functionality reduces the need for dedicated resources for each scenario, simplifying overall resource management.
Data Source
AI summary
Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may identify a maximum permissible exposure (MPE) event associated with a beam, determine that a physical uplink control channel (PUCCH) resource for transmitting a scheduling request is unavailable based at least in part on the identification of the MPE event associated with the beam, and initiate, based at least in part on the determination that the PUCCH resource is unavailable, a physical random access channel (PRACH) procedure to transmit an uplink message. Numerous other aspects are provided.