RIS Beam Sweeping SRS Positioning
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Solution Overview
Problem
Current wireless communication systems, particularly in 5G networks, face challenges in efficiently utilizing sounding reference signals (SRS) for angle of departure (AoD) based positioning due to limitations in resource configuration and beam management, which affect the accuracy and efficiency of user equipment (UE) positioning.
Innovation Solution
A method involving a reconfigurable intelligent surface (RIS) that dynamically configures and transmits SRS at different angles of departure, utilizing configuration information to optimize SRS positioning resources, enabling precise measurements and positioning operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional SRS transmission methods are used without RIS beam sweeping, then the system complexity is low, but the positioning accuracy and spectral efficiency deteriorate
Solution Approach 1:
The patent segments the SRS transmission process into multiple beam directions, with each RIS element or group transmitting SRS in a specific direction. This segmentation enables the system to measure channel characteristics in different spatial directions separately, improving positioning accuracy through angle of departure (AoD) estimation while maintaining manageable system complexity through structured beam management
Solution Approach 2:
The patent implements dynamic beam sweeping where the RIS configuration is dynamically adjusted to transmit SRS in different directions across multiple time instances. This dynamic approach allows the system to adaptively explore the spatial channel, improving positioning accuracy by capturing AoD information while the structured dynamic nature keeps system complexity controllable
2Productivity
If SRS resources are not optimized for RIS, then the resource configuration is simple, but the spectral efficiency and positioning performance deteriorate
Solution Approach 1:
The patent applies preliminary action by pre-configuring SRS transmission resources and RIS beam directions before actual positioning operations. The network device determines and configures the beam directions and SRS resource allocations in advance, allowing the RIS to efficiently sweep through predefined beams without real-time complex decision-making, thereby improving spectral efficiency while keeping resource configuration complexity manageable
Solution Approach 2:
The patent utilizes parameter changes by systematically varying beam direction parameters across different time instances during SRS transmission. The RIS changes its reflection beam directions according to configured parameters, enabling the system to gather spatial channel information efficiently. This structured parameter variation improves spectral efficiency by optimizing resource utilization while the parameter-based control keeps configuration complexity manageable
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 the accuracy and efficiency of UE positioning by effectively managing SRS resources and beam configurations, improving the spectral efficiency and positioning capabilities in 5G wireless communication systems.
Implementation Method 1
receiving, from the RIS, a plurality of SRS transmissions comprising reflections of the plurality of SRS transmissions to the RIS
Data Source
AI summary
Disclosed are techniques for wireless communication. In an aspect, a user equipment (UE) may obtain configuration information that identifies resources for sounding reference signal (SRS) positioning. The UE may transmit, to a reconfigurable intelligent surface (RIS), a plurality of SRS transmissions at different times according to the configuration information. The UE may receive, from the RIS, a plurality of SRS transmissions comprising reflections of the plurality of SRS transmissions to the RIS, wherein each of the plurality of SRS transmissions from the RIS is transmitted at a different angle of departure (AoD) from the RIS. The UE may measure each of the plurality of SRS transmissions from the RIS to produce a plurality of measurements. The UE may perform a positioning operation based on the plurality of measurements.