RIS Beam Sweeping With Sync Raster Watermarking for Initial Access
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Solution Overview
Problem
Current wireless communication systems, particularly in 5G NR, face challenges in optimizing initial access procedures and beam management due to blockages and the need for efficient beam-sweeping mechanisms that can adapt to varying environmental conditions.
Innovation Solution
The implementation of a reconfigurable intelligent surface (RIS) with multiple sub-RISs that apply different water-markings and reflect incident beams into different directions simultaneously, allowing for dynamic beam management and synchronization signal block (SSB) processing to enhance communication quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional beam-sweeping mechanisms are used in 5G NR initial access procedures, then the system can establish basic connectivity, but the system fails to adapt to blockages and varying environmental conditions, resulting in poor communication quality
Solution Approach 1:
The RIS is configured to dynamically adjust beam directions by receiving configuration messages from the base station that specify different RIS sync raster offsets. This allows the RIS to adapt its reflection patterns in real-time based on environmental conditions and blockages, transforming a static system into a dynamic one that can respond to changing conditions during the initial access procedure.
Solution Approach 2:
The RIS acts as an intermediary device between the base station and UEs, reflecting and redirecting synchronization signal blocks (SSBs) to overcome blockages. By positioning the RIS in the environment, it mediates the communication path, allowing signals to reach UEs that would otherwise be blocked, thereby improving reliability without requiring direct line-of-sight between base station and UE.
2Area of stationary object
If multiple SSB beams are transmitted for beam-sweeping, then comprehensive beam coverage is achieved, but the complexity of monitoring and selecting suitable beams increases for UEs
Solution Approach 1:
Different RIS sync raster offsets are applied to different SSB beams, creating local distinctions in frequency domains. This allows UEs to identify and select suitable beams more easily by monitoring for these distinct offset patterns, reducing the complexity of beam selection while maintaining comprehensive coverage across different spatial directions.
Solution Approach 2:
The base station pre-configures the RIS with multiple sync raster offsets before the initial access procedure begins. This preliminary configuration enables the RIS to immediately reflect beams with distinguishable frequency characteristics when UEs start monitoring, reducing the real-time complexity of beam selection without sacrificing coverage comprehensiveness.
3Productivity
If the RIS reflects SSB beams with different water-markings, then beam identification and selection become more efficient, but the configuration complexity of the RIS increases
Solution Approach 1:
The RIS configuration complexity is managed by changing frequency domain parameters (RIS sync raster offsets) rather than requiring complex spatial or temporal configurations. By adjusting these frequency parameters, the RIS can efficiently differentiate between multiple reflected beams through water-marking, improving beam identification efficiency while keeping the configuration mechanism relatively simple and parameter-based.
4Measurement precision
If the base station configures the RIS with multiple sync raster offsets, then beam differentiation and identification improve, but the signaling overhead and configuration time increase
Solution Approach 1:
The base station performs the RIS configuration with multiple sync raster offsets in advance, before the UE needs to perform beam identification. This preliminary action ensures that when UEs start monitoring for initial access, the RIS is already configured to provide differentiated beam reflections, thereby achieving precise beam identification without adding significant time loss during the critical access procedure.
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 communication quality by adapting beam directions to overcome blockages and optimize signal transmission, enhancing the efficiency of initial access and beam management in wireless communication systems.
Implementation Method 1
The RIS may be configured to simultaneously apply different water-markings and reflect the incident beam into different beams in different directions simultaneously
Implementation Method 2
The RIS may be configured to simultaneously apply different water-markings and reflect the incident beam into different beams in different directions simultaneously
Data Source
AI summary
A reconfigurable intelligent surface (RIS) may include multiple sub-RIS, and the base station may configure the RIS and the multiple sub-RIS with RIS sync raster including multiple center frequencies. The RIS may be configured to simultaneously apply different water-markings and reflect the incident beam into different beams in different directions. The base station may perform a beam-sweeping by transmitting synchronization signal blocks (SSBs) on multiple SSB beams, and the RIS may receive one SSB beam of the multiple SSB beams and reflect the SSB beams on the RIS sync raster. A UE may be configured to monitor the base sync raster and the RIS sync raster for a suitable SSB beam, and transmit a feedback report to the base station indicating the suitable beam. The base station may configure the RIS based on the feedback report received from the base station for beam management.