Multi-RIS Passive Communication for Obstruction-Aware Beamforming
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently utilizing multiple reflective surfaces for improved signal transmission and reception, particularly in environments with obstructions, leading to reduced network capacity and increased power consumption.
Innovation Solution
The implementation of reconfigurable intelligent surfaces (RIS) that can dynamically adjust the phase and angle of reflection for RF signals, allowing for enhanced signal relay and beamforming without active amplification, thereby improving network throughput and reducing power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple reflective surfaces are used to overcome obstructions and serve more UEs, then network capacity is improved, but power consumption increases
Solution Approach 1:
The RIS is configured to autonomously select and switch between active and dormant states based on signal detection. When no signal is detected above a threshold, the RIS automatically transitions to dormant state to conserve power, and activates only when needed, making the system self-managing regarding power consumption
Solution Approach 2:
The RIS dynamically adjusts its operational state between active and dormant modes. The system continuously monitors for incoming signals and adapts its power consumption level accordingly, switching from high-power active state to low-power dormant state and back again based on real-time communication needs
2Productivity
If reconfigurable intelligent surfaces are deployed to enhance signal relay and beamforming, then network throughput is improved, but device complexity increases
Solution Approach 1:
The patent extracts the intelligent signal processing functions from the RIS and relocates them to the base station. The base station performs signal detection, determines RIS states, and controls RIS operations, while the RIS itself becomes a simpler passive reflecting element, reducing complexity at the distributed device level
Solution Approach 2:
The base station acts as an intermediary that manages the complexity of coordinating multiple RIS units. Instead of each RIS needing independent intelligence, the base station centralizes the control logic, simplifying individual RIS devices while maintaining overall system sophistication
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
RISs enhance network capacity by increasing the number of served UEs and overcoming obstructions while minimizing power consumption, offering a more efficient and sustainable communication solution.
Implementation Method 1
reconfigurable intelligent surfaces (RIS) that can dynamically adjust the phase and angle of reflection for RF signals
Data Source
AI summary
Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may receive configuration information identifying a set of sub-bands for receiving, via a set of reconfigurable intelligent surfaces (RISs), a signal. The UE may receive, via a first RIS of the set of RISs, the signal in a first sub-band of the set of sub-bands. The UE may receive, via a second RIS of the set of RISs, the signal in a second sub-band of the set of sub-bands. The UE may transmit, based at least in part on receiving the signal, RIS information indicating at least one of: first RIS information regarding the first RIS, or second RIS information regarding the second RIS. Numerous other aspects are described.