Radio Terminal Uplink Power Control for Dynamic MPE Compliance
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Solution Overview
Problem
Existing radio communication systems face challenges in dynamically managing UE transmit power to comply with Maximum Permitted Exposure (MPE) regulations, particularly in mm Wave frequencies, due to the limitations of Power Management Maximum Power Reduction (P-MPR) and maxUplinkDutyCycle methods, which are coarse and inflexible.
Innovation Solution
A method involving a radio terminal and network node interaction to determine and configure uplink output power by transmitting a demand power reduction based on a maximum power level and actual uplink duty cycle, allowing the network to moderate the power reduction dynamically.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If P-MPR method is used to reduce output power to meet MPE requirements, then compliance with Maximum Permitted Exposure regulations is improved, but the method is coarse and inflexible because the UE must take the worst case transmission duty cycle into account without awareness of network scheduling intentions
Solution Approach 1:
The patent introduces dynamic power management where the UE reports its power headroom and the network dynamically adjusts the UE's maximum power level based on actual scheduling decisions and MPE requirements. This replaces the static worst-case approach with a dynamic adaptation mechanism that responds to real-time network conditions and actual duty cycles, resolving the contradiction between MPE compliance reliability and power management flexibility.
2Reliability
If maxUplinkDutyCycle capability is used to indicate maximum uplink duty cycle to the network, then MPE compliance is improved, but this method is even more coarse because the indication is a capability and not dynamic signaling
Solution Approach 1:
The patent transforms the static capability indication into dynamic parameter adjustment. Instead of relying on fixed maxUplinkDutyCycle capability values, the system continuously adjusts power headroom reports and maximum power level parameters based on actual network scheduling and MPE requirements. This dynamic parameter change approach maintains MPE compliance while reducing signaling overhead by using existing PHR mechanisms rather than introducing new complex signaling.
3Object-affected harmful factors
If the UE reduces output power to meet MPE requirements, then exposure limits are complied with, but network performance and coverage may be degraded due to lower transmit power
Solution Approach 1:
The patent implements partial power reduction by adjusting the maximum power level dynamically rather than applying fixed worst-case reductions. The network configures the UE's maximum power level based on actual scheduling decisions, allowing the UE to transmit at full power when MPE requirements permit and reduce power only when necessary. This partial action approach maintains network performance while ensuring MPE compliance, avoiding excessive power reduction that would degrade productivity.
Data Source
AI summary
Disclosed is a method, carried out in a radio terminal, for configuring uplink output power of radio transmission from the radio terminal. The methods includes determining a demand power reduction (P-MPR1) based on a maximum power level associated with a first uplink duty cycle (UDC1), transmitting, to a radio network node, an indication of the demand power reduction, receiving, from the radio network node, network scheduling indicative of a second uplink duty cycle to be used as actual uplink duty cycle (UDC2), wherein the network scheduling is assessed by the radio terminal to derive a second power reduction associated with the second uplink duty cycle, and configuring the uplink output power based on the second power reduction.