RIS Parameterized Codebooks for FOV and Switching Latency
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Solution Overview
Problem
Network entities in wireless communications systems face challenges in selecting suitable codebooks for reconfigurable intelligent surfaces (RIS) due to lack of access to low-level design factors, leading to unknown impacts on field of view, gain, and codeword switching latency.
Innovation Solution
Implementing parameterized codebooks indicated by a RIS controller or determined through a handshake procedure, allowing network entities to select codebooks based on communication conditions without needing low-level RIS design information, focusing on parameters like field of view, gain, and codeword switching speed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If network entities use traditional codebook selection methods, then the system can operate with existing codebooks, but the network entity cannot accurately determine field of view, gain, and switching latency without low-level RIS design information
Solution Approach 1:
The patent introduces parameterized codebooks as an intermediary layer between the network entity and the RIS controller. Instead of directly accessing low-level RIS design factors, the network entity receives parameterized codebooks from the RIS controller that encapsulate FOV, gain, and switching latency information. This intermediary mechanism allows the network entity to make informed codebook selections without needing to understand or access the underlying RIS design details, thereby resolving the information loss problem while maintaining system operation.
2Measurement precision
If the RIS controller provides detailed low-level design factors, then the network entity can accurately determine codebook parameters, but the system becomes more complex and harder to operate
Solution Approach 1:
The patent applies parameter changes by transforming the detailed low-level RIS design factors into higher-level abstract parameters (FOV, gain, switching latency) through the parameterized codebook structure. The RIS controller translates complex design details into these summarized parameters, which are then provided to the network entity. This parameter transformation maintains measurement precision for codebook selection while significantly improving ease of operation, as the network entity only needs to work with these simplified parameters rather than complex design factors.
3Productivity
If the network entity selects codebooks without accurate parameter information, then codebook selection is simpler, but communication reliability and coverage are compromised
Solution Approach 1:
The patent implements preliminary action by having the RIS controller pre-compute and provide parameterized codebooks before the network entity needs to make codebook selections. The RIS controller performs the complex analysis of RIS design factors, FOV calculations, and gain determinations in advance, packaging this information into ready-to-use parameterized codebooks. This preliminary preparation allows the network entity to quickly and efficiently select appropriate codebooks without needing to perform complex calculations, thereby improving both selection efficiency and communication reliability simultaneously.
Data Source
AI summary
Methods, systems, and devices for wireless communications are described. A network entity may utilize parameterized codebooks to support reconfigurable intelligent surface (RIS)-assisted communications. For example, a network entity may receive an indication of one or more codebooks associated with respective sets of parameters including one or more of a respective field of view (FOV) or a respective configuration switching latency, among other parameters. The network entity may select a codebook for RIS-assisted communications based on whether the codebook satisfies one or more thresholds. The network entity may indicate the codebook to a RIS controller and may communicate one or more messages with a user equipment (UE) using a RIS in accordance with the indicated codebook.