Reconfigurable Intelligent Surface OAM Modes for Beam Failure
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently managing orbital angular momentum (OAM) for reconfigurable intelligent surfaces (RIS) to enhance coverage and capacity, particularly in overcoming signal blockage and beam failure.
Innovation Solution
Configuring RIS to generate and change OAM modes for uplink and downlink transmissions, separate RIS channels from direct channels for estimation, and implement OAM multiplexing to achieve diversity gain, while mapping transmission configuration indicator (TCI) states and reporting reference signal received power (RSRP) for RIS selection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If traditional wireless communication resources (time, frequency) are used for transmission, then system capacity is limited, but introducing new resources like OAM modes increases system complexity
Solution Approach 1:
The patent introduces orbital angular momentum (OAM) modes as an additional dimension for signal transmission. By encoding data in different OAM modes (e.g., mode 0, mode 1, mode -1) in addition to traditional time and frequency resources, the system creates a new degree of freedom for multiplexing multiple data streams, thereby increasing communication capacity without requiring additional physical infrastructure
Solution Approach 2:
The reconfigurable intelligent surface (RIS) is designed to perform multiple functions: it can reflect signals with different OAM modes, separate direct channels from RIS channels for estimation, and support both uplink and downlink transmissions. This multi-functional approach allows a single device to handle diverse communication requirements, reducing the need for additional specialized equipment
2Reliability
If RIS is used to extend coverage and overcome blockage, then signal reliability improves, but channel estimation becomes more difficult due to separation of RIS channel from direct channel
Solution Approach 1:
The patent segments the communication channel into distinct components: direct channel and RIS channel. By using different OAM modes for each path (e.g., direct channel uses mode 0 while RIS channel uses mode 1), the system separates these channels in the OAM domain, allowing independent estimation and processing of each channel component
Solution Approach 2:
The RIS acts as an intermediary element that introduces a controllable reflection path. By configuring the RIS to reflect signals with specific OAM modes, it creates a measurable intermediate channel that can be separately estimated from the direct channel, enabling accurate channel state information acquisition for both paths
3Productivity
If multiple OAM modes are used for multiplexing data streams, then spectral efficiency increases, but signal interference management becomes more complex
Solution Approach 1:
The patent utilizes the OAM mode dimension to orthogonally separate multiple data streams. Different OAM modes (e.g., mode 0, mode 1, mode -1) exhibit orthogonal properties that allow simultaneous transmission of multiple streams without mutual interference, enabling spectral multiplexing while maintaining signal integrity through the inherent orthogonality of different OAM modes
Data Source
AI summary
Various aspects of the present disclosure relate to network device (e.g., a base station) that transmits a first signaling indicating a first configuration to a reconfigurable intelligent surface (RIS) for an orbital angular momentum (OAM) mode for a reflected signal transmission from the RIS. The network device can also transmit a second signaling to a user equipment (UE) indicating a mapping of a transmission configuration indicator (TCI) to the OAM mode. Additionally, the network device can transmit a third signaling indicating a second configuration to the RIS for multiple OAM modes, and transmit the second signaling to the UE indicating the mapping of the TCI to the multiple OAM modes.