Meta-Surface Reference Signal Mapping for Movable Networks
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Solution Overview
Problem
Existing initial access procedures in communication networks do not effectively address scenarios where user equipment is served by a network node via a meta-surface, particularly in cases where the meta-surface is not fixedly mounted and can be moved, such as on vehicles or UAVs, due to the lack of Radio Resource Control (RRC) functionalities and the complexity of adapting to changing locations.
Innovation Solution
The method involves defining and transmitting reference signals via a meta-surface by a network node, which includes determining a set of reference signal indices based on the number of beams and meta-surface configurations, mapping these indices to specific beams, and controlling the reflection of these signals using phase shifts to enable effective communication with user equipment through a meta-surface.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If existing initial access procedures are used, then network access can be established, but the procedures do not effectively address scenarios where user equipment is served via a movable meta-surface due to lack of RRC functionalities
Solution Approach 1:
The patent introduces a meta-surface controller as an intermediary device that manages the movable meta-surface. This controller handles the complexity of meta-surface management, including beamforming and phase control, allowing the existing initial access procedures to work reliably while adapting to movable meta-surface scenarios. The controller acts as a mediator between the network node and the meta-surface, resolving the contradiction between maintaining procedure reliability and achieving scenario adaptability.
2Adaptability or versatility
If a meta-surface is made movable on vehicles or UAVs, then network coverage can be extended to dynamic areas, but the complexity of adapting to changing locations increases
Solution Approach 1:
The meta-surface controller is configured to autonomously manage the movable meta-surface by receiving control signals from network nodes and automatically adjusting beamforming and phase characteristics. This self-service capability allows the system to adapt to changing locations without requiring complex manual configuration or intervention, thereby extending coverage to dynamic areas while keeping the adaptation complexity manageable through automated control mechanisms.
3Reliability
If reference signals are transmitted via meta-surface with beamforming, then communication reliability is improved, but the need for precise phase control and beam management increases system complexity
Solution Approach 1:
The meta-surface controller serves as an intermediary that manages the complex beamforming and phase control operations. By centralizing these control functions in the controller rather than distributing complexity across multiple components, the system achieves improved communication reliability through precise beam management while keeping the overall system complexity manageable through a dedicated control entity that handles all phase and beam adjustments.
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 allows user equipment to establish a connection with a network node via a single or multiple meta-surfaces, extending existing initial access procedures and reducing implementation costs and complexity, while being transparent to the user equipment, thus enabling efficient and flexible network access.
Implementation Method 1
a meta-surface is made of a two-dimensional array of sub-wavelength metallic or dielectric scattering particles that transform incoming electromagnetic waves in different ways, thus causing the electromagnetic waves to be reflected in accordance with the structure of the meta-surface
Implementation Method 2
the reflection angle of an incoming electromagnetic wave can be adapted according to the generalized Snell's law
Implementation Method 3
the scattering particles or the electromagnetic reflective properties are not fixed and engineered at the manufacturing phase but can be modified depending on external stimuli that is provided to the meta-surface
Data Source
AI summary
There is provided mechanisms for transmitting reference signals via a meta-surface. A method is performed by a network node. The network node serving user equipment via at least one meta-surface over a radio propagation channel. The method comprises defining a set of reference signal indices based on number of beams in which a reference signal is to be transmitted and number of meta-surface configurations applicable to the at least one meta-surface. Each of the meta-surface configurations represents a respective set of phase shifts as applied at the at least one meta-surface. The method comprises defining a mapping between the reference signal indices and the beams. The mapping defines which of the reference signal indices to be transmitted in which of the beams. The method comprises transmitting, in the beams and according to the mapping, the reference signal with the reference signal indices over the radio propagation channel.