Beam Sweep Adjustment for Maximum Permissible Exposure
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Solution Overview
Problem
Current wireless communication technologies face challenges in managing uplink communications to avoid exceeding maximum permissible exposure (MPE) conditions, particularly when beam sweeping is involved, which can lead to resource wastage and increased latency.
Innovation Solution
A method and apparatus for determining whether an uplink communication scheduled for transmission by multiple physical uplink repetitions across multiple slots and beams is subject to an MPE condition, and adjusting the transmission accordingly by dropping or reducing physical uplink repetitions on affected beams, thereby ensuring compliance with MPE constraints.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If beam sweeping is used for uplink communication across multiple slots and beams, then communication reliability is improved, but resource wastage increases due to MPE condition violations
Solution Approach 1:
The system determines in advance whether an uplink communication is subject to MPE conditions before transmission begins. By performing this determination preliminarily, the system can identify potential MPE violations ahead of time and adjust the transmission plan accordingly, preventing resource wastage from transmissions that would violate MPE conditions while maintaining communication reliability through proactive beam selection
Solution Approach 2:
The system dynamically adjusts the beam transmission plan based on real-time MPE condition assessments. When MPE conditions are detected, the system modifies which beams are used for transmission across multiple slots, transitioning from a static beam assignment to a dynamic adaptation that prevents MPE violations while maintaining communication reliability through flexible beam selection
2Reliability
If beam sweeping is used for uplink communication, then transmission diversity is improved, but latency increases due to MPE condition checks and adjustments
Solution Approach 1:
MPE condition determinations are performed in advance before the actual data transmission begins. By completing the MPE assessment and beam selection adjustments preliminarily, the system avoids interruptions during the critical data transmission phase, thereby maintaining transmission diversity while minimizing the latency impact of MPE condition checks
Solution Approach 2:
The system maintains continuous beam sweeping operations across multiple slots without interruption for MPE checks. The MPE determination and beam adjustment processes are integrated into the continuous transmission flow, allowing the useful action of data transmission to proceed without breaks while still achieving transmission diversity through multi-beam operation
3Reliability
If physical uplink repetitions are transmitted on multiple beams, then communication robustness is improved, but MPE violations occur leading to harmful exposure
Solution Approach 1:
The system applies different transmission characteristics to different beams based on local MPE conditions. Instead of uniformly transmitting on all beams, the system identifies which specific beams violate MPE conditions and adjusts or eliminates transmissions only on those affected beams, while maintaining robust communications on beams that do not violate MPE conditions
Solution Approach 2:
The system uses the MPE condition information, which initially represents a constraint or harm, to benefit communication robustness by identifying and selecting optimal beams for transmission. The MPE condition checks enable the system to avoid harmful exposures while simultaneously improving robustness by focusing transmission power on beams that are guaranteed to meet safety conditions
Data Source
AI summary
Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may determine whether an uplink communication that is scheduled to be transmitted by a plurality of physical uplink repetitions in multiple slots on a plurality of beams is subject to a maximum permissible exposure (MPE) condition. The UE may determine a transmission adjustment for the plurality of physical uplink repetitions on the plurality of beams, based at least in part on a determination that the uplink communication is subject to the MPE condition, and transmit the uplink communication based at least in part on the transmission adjustment.