Uplink Power Control for Simultaneous E-UTRA and NR Signals
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Solution Overview
Problem
In the context of 5G mobile communication, there is a need to determine the total transmission power for both Evolved Universal Terrestrial Radio Access (E-UTRA) and New Radio (NR) uplink signals when they overlap in time, to prevent exceeding the maximum permissible exposure or specific absorption rate, given differences in scheduling units and power configurations between E-UTRA and NR.
Innovation Solution
A method is proposed where the user equipment (UE) determines the total transmission power by considering the lower and higher limits (PCMAX_L and PCMAX_H) based on overlapping scheduling unit pairs, using equations to calculate these limits for each pair, ensuring the total transmission power stays within defined tolerance values to avoid exceeding the maximum output power.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the UE transmits both E-UTRA uplink signal and NR uplink signal simultaneously, then the data transmission capacity is improved, but the total transmission power may exceed the maximum permissible exposure or specific absorption rate
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting the total transmission power based on the overlap between E-UTRA and NR uplink signals. The UE determines PCMAX_L and PCMAX_H parameters that define the valid range for total transmission power, ensuring it remains within safe limits while maximizing data transmission capacity during simultaneous transmissions
2Device complexity
If the UE determines total transmission power without considering overlapping signals, then the device complexity is reduced, but the transmission power may exceed safety limits
Solution Approach 1:
The patent applies preliminary action by having the UE proactively determine the total transmission power and validate it against PCMAX_L and PCMAX_H bounds before actual transmission occurs. This preliminary check ensures compliance with safety limits without requiring complex real-time adjustments during transmission
3Ease of operation
If the UE uses a single reference scheduling unit for power determination, then the ease of operation is improved, but the measurement precision of total transmission power is reduced
Solution Approach 1:
The patent applies segmentation by dividing the power determination process into two distinct parameter components: PCMAX_L (lower limit) and PCMAX_H (upper limit). Each parameter is determined based on the same reference scheduling unit but represents different bounds of the valid power range, providing both simplicity and precision
Data Source
AI summary
There is provided a method for determining transmission power for uplink signal, the method performed by a user equipment (UE) and comprising: determining a total transmission power for E-UTRA uplink signal and NR uplink signal, when the E-UTRA uplink signal and the NR uplink signal overlap in time, wherein the total transmission power satisfies a condition including on PCMAX_L and PCMAX_H, wherein PCMAX_L is a lower limit for the total transmission power and PCMAX_H is a higher limit for the total transmission power, wherein when the E-UTRA uplink signal is transmitted on a scheduling unit p, when the NR uplink signal is transmitted on a scheduling unit q, the scheduling unit p is taken as a reference for the determination; and transmitting the E-UTRA uplink signal and the NR uplink signal based on the determined total transmission power.