RIS OFF-Mode Beam Scattering for Interference Reduction
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Solution Overview
Problem
Conventional RIS systems cause interference due to minimal reflection amplitudes and fixed phase shifts, leading to unwanted signal reflections that disrupt UE communication, especially in scenarios with blockage.
Innovation Solution
Implement a configuration mode called 'OFF mode' that randomly selects phase shifts and amplitudes for RIS elements, dividing the RIS into sub-RISs to scatter energy in all directions, reducing interference by distributing total power among these sub-RISs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If RIS uses fixed phase shifts and minimal reflection amplitudes, then signal reflection is controlled, but interference is caused to UE communication
Solution Approach 1:
The patent applies dynamics by transitioning RIS from fixed phase shifts to dynamic random phase shifts. The RIS elements randomly select phase shifts from a predefined set, creating time-varying reflection patterns that prevent persistent interference while maintaining signal reflection control. This dynamic behavior converts the harmful fixed reflection into beneficial random scattering.
Solution Approach 2:
The patent changes the phase shift parameter from fixed values to randomly selected values from a predefined set. By varying the phase shift parameter dynamically across different time instances and RIS elements, the system achieves both signal reflection control and interference reduction through parameter randomization.
2Object-generated harmful factors
If RIS divides into sub-RISs to scatter energy in all directions, then interference is reduced, but device complexity increases
Solution Approach 1:
The patent applies segmentation by dividing the RIS into multiple independent sub-RISs or RIS elements that operate autonomously. Each element randomly selects its phase shift, creating distributed scattering centers. This segmentation achieves interference reduction through spatial distribution while managing complexity through modular, independent element operation.
Solution Approach 2:
The patent implements self-service by enabling each RIS element to autonomously and randomly select its own phase shift from a predefined set without requiring complex centralized control for each element. This self-service mechanism reduces the control complexity while achieving the desired scattering effect for interference reduction.
3Reliability
If RIS scatters multiple beams in different directions, then communication quality is enhanced, but energy distribution becomes more complex
Solution Approach 1:
The patent uses parameter changes by randomly varying the phase shift parameter across RIS elements and time instances. This randomization naturally distributes energy into multiple beams in different directions, enhancing communication quality through spatial diversity while simplifying energy management through stochastic parameter selection rather than complex deterministic control.
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
The OFF mode configuration effectively disperses energy in various directions, minimizing interference and enhancing communication quality by scattering multiple beams, thus improving signal transmission in RIS-assisted wireless systems.
Implementation Method 1
scattering the multiple beams from the RIS in different directions
Data Source
AI summary
The present disclosure relates to a 5G communication system or a 6G communication system for supporting higher data rates beyond a 4G communication system such as long term evolution (LTE). In an embodiment of the disclosure, the method performed by a base station is provided. The method comprises transmitting to an UE a RS for at least one of a direct BS candidate beam and an RIS candidate beam and receiving from the UE a measurement report comprising a RSRP. In case that the RSRP meets the RSRP criteria, the method comprises selecting a first mode configuration for the RIS among a plurality of mode configurations for the RIS based on a link between the BS and the UE. The method comprises switching from the RIS candidate beam to direct BS candidate beam and scattering the multiple beams from the RIS in different directions.