RIS-Aware Uplink Power Control Through Effective Pathloss
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Solution Overview
Problem
Existing wireless communication systems face challenges in accurately calculating pathloss for uplink transmissions in the presence of reconfigurable intelligent surfaces (RIS), which can lead to inefficiencies in power consumption and coverage extension.
Innovation Solution
The method involves a user equipment (UE) receiving multiple reference signals from RISs and a base station, determining a set of operative RISs, and calculating an effective pathloss based on a function of individual pathlosses to accurately determine uplink transmission power.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional pathloss calculation methods are used in wireless networks with RISs, then the calculation process is simple, but the accuracy of pathloss calculation and uplink transmission power determination deteriorates due to not accounting for RIS configurations and reflections
Solution Approach 1:
The patent segments the pathloss calculation by identifying multiple distinct path components: direct path from base station to UE, and reflected paths through individual RIS elements. Each RIS element's contribution is calculated separately using its specific configuration parameters (phase shift, amplitude), allowing accurate accounting of complex multipath environments while maintaining systematic organization of the calculation process
Solution Approach 2:
The patent introduces an intermediary calculation layer that processes RIS configuration parameters (phase shifts, amplitudes) and reference signal measurements to derive effective pathloss. This intermediary layer translates complex RIS reflections into equivalent pathloss values that can be integrated with traditional power control algorithms, bridging the gap between simple calculation methods and accurate RIS-aware modeling
2Reliability
If RIS configurations are not accounted for in pathloss calculation, then the calculation process is simple, but network coverage and power consumption efficiency deteriorate
Solution Approach 1:
The patent performs preliminary actions by having the base station configure RIS elements with specific phase shifts and amplitudes before uplink transmission, and by providing the UE with RIS configuration information and reference signals in advance. This allows the UE to pre-calculate the effective pathloss considering RIS reflections, ensuring accurate power control is in place before actual data transmission, thereby improving network coverage reliability
Solution Approach 2:
The patent implements feedback mechanisms where the base station provides RIS configuration parameters and reference signal measurements to the UE, and the UE uses this feedback to determine effective pathloss and adjust uplink transmission power accordingly. This closed-loop feedback ensures that power control adapts to actual RIS reflection conditions, improving both coverage reliability and power efficiency
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach improves the accuracy of pathloss calculation and uplink transmission power, reducing power consumption while effectively extending network coverage using RISs.
Implementation Method 1
The RIS may be controlled to reflect an impinging signal to a desired direction
Data Source
AI summary
A method for wireless communication performed by a user equipment (UE) includes receiving multiple reference signals (RSs), each RS of the plurality of RSs being associated with a reflection from a respective reconfigurable intelligent surface (RIS), of multiple RISs, or with a direct transmission from a base station. The method also includes receiving, from the base station, a RIS configuration indicating a set of operative RISs, of the plurality of RISs, that reflect an uplink transmission from the UE. The method further includes transmitting, to the base station, an uplink message according to an uplink transmission power, the uplink transmission power being based on an effective pathloss that is a function of each pathloss of a set of pathlosses respectively associated with a set of RSs, of the multiple RSs, that are respectively associated with the set of operative RISs or the base station.