Full-Duplex Uplink Power Control Using PL-RS Self-Interference Measurement
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Solution Overview
Problem
Existing full duplex (FD) systems face challenges in effectively managing self-interference, which reduces efficiency and increases latency due to uncontrolled uplink (UL) transmit power, particularly in beamforming scenarios.
Innovation Solution
The implementation of path loss (PL) reference signals (PL-RS) for measuring self-interference allows for adjusting UL transmit power, enabling more precise power control and reducing self-interference in FD operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If uplink transmit power is increased to improve communication quality, then signal strength is improved, but self-interference increases
Solution Approach 1:
The patent dynamically adjusts uplink transmit power parameters based on measured self-interference levels. The base station measures self-interference using path loss reference signals and sends power control commands to the UE to adjust transmit power, thereby changing the power parameter to balance communication quality and self-interference mitigation.
Solution Approach 2:
The patent implements a feedback mechanism where the base station measures self-interference from uplink transmissions, determines appropriate power adjustments, and sends control commands back to the UE. This closed-loop feedback system continuously optimizes transmit power to maintain communication quality while minimizing self-interference.
2Productivity
If self-interference measurement and power control is implemented, then spectral efficiency is improved, but system complexity increases
Solution Approach 1:
The patent introduces path loss reference signals as an intermediary mechanism to enable self-interference measurement. These dedicated reference signals provide a known reference for the base station to measure the interference level from uplink transmissions, simplifying the measurement process compared to analyzing actual data transmissions.
Solution Approach 2:
The patent separates the power control function into distinct components: path loss reference signal transmission, self-interference measurement at the base station, power control command generation, and UE power adjustment. This segmentation allows each component to be optimized independently and simplifies the overall system implementation.
Data Source
AI summary
This disclosure provides systems, devices, apparatus, and methods, including computer programs encoded on storage media, for power control in FD systems based on a PL-RS for measuring self-interference. In aspects, a base station may configure a PL-RS for one or more beam pairs and schedule a DL transmission including the PL-RS. A UE may measure self-interference corresponding to the one or more beam pairs based on the PL-RS and adjust an UL Tx power for a FD operation based on the self-interference measured for the one or more beam pairs. The UE may subsequently transmit an UL transmission for the FD operation based on the adjustment to the UL Tx power, such that the base station may receive an UL transmission having an UL Tx power that is based on the measured self-interference associated with the PL-RS.