Full Duplex Power Reduction Parameters for Emission Control
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Solution Overview
Problem
Current methods for controlling transmission power in Full Duplex communications, such as MPR and A-MPR parameters, fail to comply with regulatory requirements for spurious emissions and out-of-band emissions, especially when network nodes and user equipment transmit simultaneously on the same frequency channels, leading to excessive power emissions.
Innovation Solution
Deriving Full Duplex maximum power reduction parameters based on both uplink and downlink transmission parameters to limit the total emitted power, ensuring compliance with regulatory constraints by considering both the network node and user equipment's power levels and interference conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If MPR and A-MPR parameters are used to control transmission power, then uplink power control is improved, but spurious emissions and out-of-band emissions exceed regulatory limits in Full Duplex mode
Solution Approach 1:
The patent introduces new Full Duplex specific parameters (FD-MPR and FD-A-MPR) that modify the existing MPR and A-MPR parameters. These new parameters are derived based on both uplink and downlink transmission parameters, enabling dynamic adjustment of maximum transmit power to comply with regulatory emission limits while maintaining full duplex operation
Solution Approach 2:
The patent segments the power control mechanism by separating Full Duplex specific parameters from existing Half Duplex parameters. The FD-MPR and FD-A-MPR parameters are independently derived and applied only in Full Duplex mode, allowing targeted control of emissions without affecting other operational modes
2Productivity
If network node and user equipment transmit simultaneously on the same frequency channel, then spectral efficiency is improved, but total emitted power exceeds regulatory limits
Solution Approach 1:
The patent implements a feedback mechanism where the network node signals downlink transmission power information to the user equipment. The UE uses this feedback along with uplink parameters to derive FD-MPR and FD-A-MPR values, creating a closed-loop system that ensures total emitted power compliance while enabling simultaneous bidirectional transmission
Solution Approach 2:
The patent applies preliminary action by having the network node provide downlink power information to the UE before the UE determines its uplink transmit power. This allows the UE to pre-calculate appropriate FD-MPR and FD-A-MPR values to ensure regulatory compliance before actual transmission occurs
Data Source
AI summary
The disclosure relates to transmission power control for Full Duplex, FD, Communications. In particular it relates to methods in a wireless device and in a network node of controlling Full Duplex, FD, transmission power using Maximum Power Reduction, MPR, parameters for FD Communications and to a corresponding network node, wireless device and computer program. According to some aspects, the disclosure relates to a method, performed in a wireless device 10, being served by a network node 20, for controlling Full Duplex, FD, transmission power. The method comprises receiving (S1), from the network node, information indicative of a downlink transmission power of the network node, and obtaining (S3) at least one Full Duplex maximum power reduction parameter, based on the received information. The method further comprises determining (S4) uplink transmission power based on the at least one Full Duplex maximum power reduction parameter and transmitting (S5) an uplink signal to the network node, with the determined uplink transmission power, in the FD mode. Thereby, Full Duplex maximum power reduction parameters can be set such that the total emitted power by the wireless device and the network node together will stay within predefined limits.