MPE-aware transmission scheduling for wireless uplink
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Solution Overview
Problem
Current wireless communication technologies, such as LTE and NR, face challenges in managing radio frequency exposure limits, particularly in maintaining uplink connections while adhering to maximum permissible exposure (MPE) regulations, as base stations lack information on a user equipment's energy budget, leading to inefficient scheduling and potential connection drops.
Innovation Solution
Implementing a method where user equipment (UE) transmits MPE-related information, including transmit power limits and average power limits, to the base station, allowing for dynamic scheduling adjustments to ensure compliance with MPE regulations and maintain uplink connections efficiently.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If base stations schedule transmissions without MPE information, then scheduling simplicity is maintained, but MPE compliance cannot be ensured and connection drops occur
Solution Approach 1:
The UE transmits MPE-related information (energy budget, power limits) to the base station in advance before scheduling decisions are made. This preliminary provision of MPE status enables the base station to perform MPE-aware scheduling without real-time complexity, as the scheduling algorithm can proactively adjust resource allocation based on pre-received MPE constraints.
Solution Approach 2:
The UE provides periodic or event-triggered feedback about its MPE status (current energy budget, transmit power limits) to the base station. This feedback mechanism allows the base station to adapt its scheduling decisions dynamically while maintaining relatively simple scheduling logic, as the MPE constraints are communicated as ready-made parameters rather than requiring complex real-time calculations.
2Object-affected harmful factors
If UE reduces transmit power to comply with MPE limits, then MPE regulations are satisfied, but uplink connection quality deteriorates and drops occur
Solution Approach 1:
The base station dynamically adjusts the uplink resource allocation (time, frequency, power) based on the UE's reported MPE status. When the UE's energy budget allows, the base station schedules higher power transmissions; when MPE limits are approached, the base station proactively reduces scheduling intensity or shifts resources to downlink, thereby maintaining connection reliability while complying with MPE constraints.
Solution Approach 2:
The base station changes scheduling parameters (resource block allocation, modulation and coding scheme, transmit power) based on the UE's MPE-related information. By adjusting these parameters according to the UE's current energy budget and power limits, the system maintains optimal uplink connection quality within MPE compliance boundaries, avoiding connection drops that would result from rigid power reduction.
3Measurement precision
If MPE-related information is transmitted frequently, then scheduling accuracy improves, but signaling overhead increases
Solution Approach 1:
Instead of transmitting complete MPE status information at every scheduling opportunity, the UE transmits MPE-related information selectively based on changes in MPE status or at periodic intervals. This partial transmission approach provides sufficient scheduling accuracy for the base station to make informed decisions without incurring the full overhead of continuous detailed reporting.
Solution Approach 2:
The UE transmits MPE-related information periodically or event-triggered (e.g., when MPE status changes significantly) rather than continuously. This periodic feedback mechanism maintains adequate scheduling accuracy while significantly reducing signaling overhead compared to real-time continuous reporting, as the base station can interpolate or adaptively adjust scheduling between updates.
Data Source
AI summary
Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment may transmit maximum permissible exposure related information that indicates at least one of: a transmit power limit corresponding to a specified time interval, an average transmit power limit corresponding to the specified time interval, or a combination thereof; and receive an allocation of transmission resources. Numerous other aspects are provided.