UE Beam Reporting for MPE-Compliant Uplink Switching
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Solution Overview
Problem
Existing wireless communication systems face challenges in managing maximum permissible exposure (MPE) conditions, leading to unreliable beam reselection methods that impact downlink performance and increase latency.
Innovation Solution
A two-step or three-step physical random access channel (PRACH) transmission is used by user equipment (UE) to indicate satisfied MPE conditions, allowing for the selection and communication of an updated uplink beam without disrupting the downlink beam, thereby reducing latency and improving throughput.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If beam reselection is performed to satisfy MPE conditions, then MPE compliance is improved, but downlink performance deteriorates and latency increases
Solution Approach 1:
The patent segments the beam management process by separating uplink beam indication from downlink beam configuration. The UE independently selects and indicates uplink beams based on MPE conditions without triggering downlink beam reconfiguration, thus maintaining downlink performance while ensuring MPE compliance through selective uplink beam adjustment.
Solution Approach 2:
The patent implements preliminary action by having the UE proactively monitor and evaluate multiple candidate uplink beams against MPE conditions before transmission. The UE performs advance assessment of beam suitability and prepares MPE satisfaction indications in advance, enabling quick beam switching when MPE violations are detected without disrupting ongoing downlink communication.
2Reliability
If beam reselection is performed to satisfy MPE conditions, then MPE compliance is improved, but latency increases
Solution Approach 1:
The UE continuously monitors and pre-evaluates candidate uplink beams against MPE conditions before actual transmission needs arise. This preliminary assessment allows the UE to immediately switch to compliant beams when MPE violations are detected, avoiding latency associated with real-time beam evaluation and selection procedures.
Solution Approach 2:
The UE autonomously performs MPE condition assessment and self-selects compliant uplink beams without requiring base station intervention or coordination. This self-service approach eliminates signaling delays and complex coordination procedures, enabling rapid beam switching that minimizes latency while ensuring MPE compliance.
3Reliability
If traditional beam reselection methods are used, then MPE conditions can be satisfied, but the process disrupts downlink beam stability
Solution Approach 1:
The patent divides beam management into independent uplink and downlink components. The UE independently selects uplink beams based on MPE conditions using segmented processing that does not interfere with downlink beam configuration. This segmentation allows uplink beam adjustment while maintaining downlink beam stability, as each direction's beam management operates autonomously without cross-interference.
Solution Approach 2:
Instead of the traditional approach where beam reselection triggers downlink beam changes, the patent inverts the logic by having the UE independently indicate uplink beam selections without initiating downlink beam reconfiguration. This inversion breaks the causal chain that previously linked uplink beam changes to downlink beam disruptions, thereby maintaining downlink stability while achieving MPE compliance through uplink beam adjustment alone.
Data Source
AI summary
Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may determine that a maximum permissible exposure (MPE) condition is satisfied for the UE; transmit, to abase station, a message based at least in part on determining that the MPE condition is satisfied; and transmit, to the base station based at least in part on the MPE condition being satisfied, beam information indicating an updated transmit beam for the UE. Numerous other aspects are provided.