UL Beam Reset After MPE Reporting for Reliable Uplink Switching
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Solution Overview
Problem
Existing wireless communication systems face challenges in managing uplink (UL) beams to avoid maximum permissible exposure (MPE) to prevent harmful radio wave exposure, particularly in scenarios with multiple component carriers (CCs) and carrier aggregation.
Innovation Solution
A user equipment (UE) detects MPE events and sends an MPE report to a network entity, which triggers UL beam resetting to a new candidate beam, ensuring compliance with MPE regulations by using a response from the network entity to switch to a new UL beam for transmissions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If UL beam resetting is performed to avoid MPE, then compliance with exposure limits is improved, but communication reliability may deteriorate due to beam switching
Solution Approach 1:
The network entity pre-configures multiple candidate UL beams and their corresponding MPE values before actual transmission. When MPE issues are detected, the system can immediately switch to a pre-evaluated alternative beam, ensuring both MPE compliance and communication continuity without interruption.
Solution Approach 2:
The system implements a feedback mechanism where the UE reports MPE events to the network entity, which then provides beam reset indications. This closed-loop feedback ensures that beam switching decisions are based on actual MPE measurements and network coordination, maintaining both compliance and reliability.
2Object-affected harmful factors
If MPE monitoring and reporting is implemented, then exposure safety is improved, but system complexity increases
Solution Approach 1:
The UE autonomously monitors MPE conditions and generates MPE reports when thresholds are exceeded. This self-service approach allows the terminal to handle safety monitoring independently, reducing the need for complex network-side monitoring infrastructure while ensuring exposure safety.
Solution Approach 2:
The system uses configurable parameters such as mpe-EventThreshold and mpe-EventTimer to control MPE monitoring behavior. These parameters can be adjusted based on deployment scenarios, allowing the system to balance safety requirements with complexity constraints through parameter optimization rather than structural changes.
3Object-affected harmful factors
If beam switching is performed upon MPE detection, then MPE compliance is improved, but transmission interruption increases
Solution Approach 1:
The network entity pre-configures multiple candidate UL beams with their MPE characteristics before transmission begins. When an MPE event is detected, the system can immediately switch to a pre-evaluated alternative beam, ensuring both MPE compliance and communication continuity without interruption.
Data Source
AI summary
Certain aspects of the present disclosure provide a method for wireless communication by a user equipment (UE). The UE transmits, to a network entity via a first beam, a maximum permissible exposure (MPE) report indicating a second beam. The UE then receives a response indicating an acknowledgment of the MPE report from the network entity. The UE then transmits an uplink (UL) transmission using the second beam to the network entity.