RIS Beam Mapping for Obstructed THz Channel State Scheduling
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Solution Overview
Problem
In wireless communication systems, particularly in the terahertz band of 6G communication, securing signal transmission distance and improving spectral efficiency are crucial due to severe path loss and atmospheric absorption, with existing methods failing to effectively determine optimal beams in fluctuating channel states, especially when obstacles interfere with direct communication.
Innovation Solution
A method and apparatus that utilize a reconfigurable intelligent surface (RIS) to adjust signal reflection patterns and phases, providing mapping and scheduling information to terminals and base stations for determining optimal reception beams based on combined channel states, including both direct and reflected signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If RIS is introduced to improve coverage in THz band, then signal transmission distance is extended, but device complexity increases due to additional mapping and scheduling information requirements
Solution Approach 1:
The patent segments the RIS operation into discrete reflection patterns and transmission beams, creating a manageable grid of pre-configured states. This segmentation allows the system to handle complexity through structured organization rather than continuous adjustment, resolving the contradiction between extended coverage and increased system complexity.
Solution Approach 2:
The patent implements preliminary configuration of RIS reflection patterns and transmission beam mappings before actual communication occurs. By pre-establishing the mapping relationships between RIS states and reference signals, the system reduces real-time computational burden while maintaining extended coverage capability.
2Reliability
If beam determination is based on traditional methods without RIS mapping, then device complexity is lower, but reliability deteriorates in fluctuating channel states with obstacles
Solution Approach 1:
The patent incorporates feedback mechanisms where the terminal reports channel state information and the base station adjusts the RIS reflection patterns and transmission beam mappings accordingly. This feedback loop enables reliable communication in fluctuating channel conditions while managing complexity through iterative optimization rather than complex one-time calculations.
Solution Approach 2:
The patent introduces reference signals as intermediaries to bridge the RIS configuration and beam determination processes. These reference signals enable the terminal to measure channel characteristics without requiring direct complex calculations, thereby improving reliability while keeping the beam determination process manageable.
3Measurement precision
If mapping information between RIS reflection patterns and transmission beams is transmitted, then beam determination accuracy is improved, but loss of information increases due to additional signaling overhead
Solution Approach 1:
The patent designs the mapping information to serve multiple functions: it provides beam determination guidance, enables channel state measurement, and supports communication reliability assessment simultaneously. By making the signaling overhead multi-functional, the system reduces the net information loss despite the additional signaling requirements.
Solution Approach 2:
The patent dynamically adjusts the mapping information parameters based on channel conditions, using only the necessary precision required for current operational needs. This parameter adaptation allows the system to maintain measurement accuracy while minimizing signaling overhead by transmitting only essential mapping details rather than complete configuration data.
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
Enhances communication effectiveness by optimizing reception beams considering channel fluctuations and interference, ensuring reliable signal transmission even in obstructed environments.
Implementation Method 1
utilize a reconfigurable intelligent surface (RIS) to adjust signal reflection patterns and phases
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 LTE. The disclosure provides a method performed by a UE. The method includes receiving mapping information between a combination of a reflection pattern and a transmission beam of a BS and an RS from the BS; receiving scheduling information including information on a channel state corresponding to the combination of the reflection pattern and the transmission beam of the BS; identifying a reception beam based on at least one RS received from the BS, the mapping information, and the scheduling information; and receiving a downlink signal from the BS through the reception beam. The reflection pattern is related to an RIS.