Frequency-Dependent Uplink Power Control for Full Duplex Interference
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Solution Overview
Problem
Existing wireless communication systems face challenges in managing uplink power control for full duplex communication, leading to self-interference issues due to simultaneous transmission and reception on the same frequency band.
Innovation Solution
Implementing uplink power control techniques that vary the transmission power based on the location of the uplink frequency relative to the downlink frequency band, using methods such as DCI scheduling and adaptive power adjustment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If uplink transmission power is increased to improve communication reliability, then signal strength is improved, but self-interference with downlink reception increases
Solution Approach 1:
The patent applies local quality by differentiating power control across different frequency sub-bands within the uplink bandwidth. Instead of using a uniform power level, the system assigns different power offsets to different sub-bands based on their proximity to the downlink frequency, thereby locally optimizing the balance between signal strength and self-interference reduction.
Solution Approach 2:
The patent changes the power parameter dynamically based on frequency location. By introducing frequency-dependent power offsets that adjust transmit power levels according to the distance from the downlink frequency, the system optimizes communication reliability while minimizing self-interference through parameter adaptation.
2Device complexity
If uniform power control is used across the uplink frequency band, then implementation is simple, but spectral efficiency is reduced due to unnecessary power in regions close to downlink frequency
Solution Approach 1:
The patent divides the uplink frequency band into multiple sub-bands and applies different power control parameters to each sub-band. This segmentation allows the system to reduce power in sub-bands close to the downlink frequency (improving spectral efficiency) while maintaining simple implementation through standardized sub-band power offset configurations.
3Object-generated harmful factors
If power is reduced in sub-bands close to downlink frequency to reduce self-interference, then interference is reduced, but uplink signal strength in those sub-bands decreases
Solution Approach 1:
The patent introduces frequency-dependent power offset parameters that are configured based on the distance of each sub-band from the downlink frequency. This parameter change strategy reduces power only where necessary (near downlink frequency) while maintaining adequate signal strength in other sub-bands, achieving a balanced optimization.
Data Source
AI summary
Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may receive downlink control information (DCI) that schedules an uplink communication in an uplink frequency band. The UE may transmit, at an uplink frequency within the uplink frequency band, the uplink communication with a power that varies over the uplink frequency band based at least in part on a location of the uplink frequency relative to a downlink frequency band associated with the UE. Numerous other aspects are provided.