3D Waveform Coding for Inter-User Interference Control
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Solution Overview
Problem
Current 5G NR systems face significant challenges in managing inter-user interference (IUI) due to the use of high-frequency bands like millimeter waves, which are susceptible to rapid channel variations and severe path loss, leading to difficulties in maintaining reliable communication, especially in scenarios where multiple users are served by the same beam.
Innovation Solution
A 3D waveform coding scheme is implemented that utilizes the spatial properties of 5G NR systems by characterizing each user equipment's location with three parameters: propagation delay, angle of elevation, and angle of azimuth, generating a unique lattice code for each user. If the lattice distance between co-beamed users exceeds a threshold, a conjugate lattice code is applied to mitigate IUI, leveraging the Voronoi lattice concept to ensure higher immunity to interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple users are served by the same beam in 5G NR systems, then system capacity and resource utilization are improved, but inter-user interference increases
Solution Approach 1:
The patent applies local quality by assigning different lattice codes to different users within the same beam based on their specific spatial locations (angles of elevation and azimuth). Each user receives a code optimized for their local position, which reduces inter-user interference while maintaining high system capacity. The base station determines lattice codes individually for each user equipment based on channel state information.
Solution Approach 2:
The patent changes the coding parameter from traditional 2D lattice codes to 3D lattice codes that incorporate the propagation delay dimension in addition to angles of elevation and azimuth. This parameter expansion in the coding domain creates better separation between user signals, reducing interference while allowing multiple users to share the same beam.
2Object-generated harmful factors
If 3D waveform coding with lattice codes is implemented, then inter-user interference is reduced, but computational complexity increases
Solution Approach 1:
The patent applies preliminary action by pre-calculating and storing lattice codes in a codebook before actual communication occurs. During operation, the base station simply looks up and assigns appropriate lattice codes from the pre-computed codebook based on user channel conditions, avoiding real-time complex calculations and reducing computational complexity while maintaining interference reduction benefits.
Data Source
AI summary
Aspects of the present disclosure implement techniques of a new 3D waveform coding scheme that leverages the spatial properties of 5G NR systems. Specifically, in 5G systems, each UE location may be characterized by three parameters: propagation delay (tp), angle of elevation (θ), and angle of azimuth (φ). Global coding matrix may be generated by linear combination of these three attributes and a unique lattice code may be generated for each UE at different locations from the base station. Thus, considering the coding gain increases with increasing the distance between the codes, aspects of the present disclosure take advantage of geometrical properties of lattice. Particularly, within the 3D waveform coding, if lattice distance between co-beamed UEs is determined to be greater than threshold radius, a conjugate lattice code for the UEs may be applied in accordance with aspects of the present disclosure.