OAM Feedback Codebook for Backhaul-Access Interference Separation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing wireless communication systems face interference issues between orbital angular momentum (OAM) based backhaul and access communications, which affect the efficiency and quality of signal transmission.
Innovation Solution
Implementing a feedback codebook system where network nodes transmit reference signals with specific OAM modes, and user equipment (UE) provides feedback on codewords to manage interference by using non-dominant or dominant eigenvectors, enabling orthogonal communication modes for backhaul and access links.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If OAM modes are used for backhaul communications, then communication capacity is improved, but interference with access communications increases
Solution Approach 1:
The patent segments the OAM modes into separate groups for backhaul communications and access communications. Specifically, certain OAM modes (e.g., higher-order modes) are allocated to backhaul links while other modes (e.g., lower-order modes) are allocated to access links, thereby separating the two communication functions in the OAM mode domain to eliminate mutual interference.
Solution Approach 2:
The patent introduces an additional dimension for resource allocation by utilizing the OAM mode dimension. Instead of only allocating resources in time, frequency, or spatial domains, the system now allocates different OAM modes to different communication functions (backhaul vs. access), effectively adding a new degree of freedom for interference management.
2Object-generated harmful factors
If separate OAM modes are allocated for backhaul and access links, then interference is reduced, but system complexity increases
Solution Approach 1:
The patent implements a feedback mechanism where the user equipment (UE) measures reference signals transmitted on different OAM modes and reports channel state information back to the network. Based on this feedback, the network dynamically determines and configures which OAM modes should be used for backhaul versus access communications, allowing the system to adapt to changing conditions without manual intervention.
Solution Approach 2:
The system enables the UE to self-configure its reception parameters based on the received TCI state indications. The UE autonomously determines which OAM modes to monitor and measure for access communications based on the network's configuration, reducing the signaling overhead and simplifying the overall system operation.
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 reduces interference between OAM beamformed signals, enhancing communication quality and efficiency by allowing separate OAM modes for backhaul and access links, thereby improving overall network performance.
Implementation Method 1
orbital angular momentum (OAM) based codebook for access communications
Data Source
AI summary
Methods, systems, and devices for wireless communications are described. Feedback based codebooks for reducing or eliminating interference between orbital angular momentum (OAM) based backhaul communications between a first network node and a second network node and access communications between the first network node and a user equipment (UE) are described. The first network node may transmit a message to a UE indicating a feedback codebook for a set of reference signals associated with OAM modes. The first network node may transmit the reference signals, where each reference signals may be associated with a respective OAM mode. The UE may generate and indicate in a feedback report to the first network node codewords corresponding to UE feedback for the received reference signals. The first network node may communicate with the UE via an access link and with the second network node via a backhaul link based on the feedback report.