5G Constellation Selection Under Phase Noise and PA Non-Linearity
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Solution Overview
Problem
Existing 5G communication systems face challenges in optimizing constellations due to phase noise and power amplifier non-linearity, necessitating a practical and simple method to support various constellations without increasing complexity for all user equipment (UEs).
Innovation Solution
A network device indicates available constellations for modulation and coding schemes (MCS) to a terminal device, allowing flexible selection based on factors like phase noise and power amplifier non-linearity, with support for multiple constellations per MCS, optimizing modulation performance and coverage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If QAM modulation with maximized Euclidean distances is used, then the constellation is simple, but it becomes suboptimal under phase noise and power amplifier non-linearity
Solution Approach 1:
The patent implements dynamic constellation selection where the network device configures multiple constellations for different MCS and indicates the appropriate constellation to use based on current channel conditions, phase noise levels, and power amplifier characteristics. This allows the system to adapt from simple QAM to optimized constellations dynamically, resolving the contradiction between simplicity and performance.
Solution Approach 2:
The patent changes the modulation parameter by selecting from multiple constellation configurations for the same MCS. The network device configures different constellations (e.g., different point distributions, rotations, or scaling) and indicates which one to use, allowing optimization of constellation geometry based on phase noise and PA non-linearity conditions without changing the fundamental QAM modulation type.
2Reliability
If various constellations are supported for different conditions, then modulation performance is optimized, but device complexity increases
Solution Approach 1:
The patent segments the constellation selection process by having the network device perform the configuration and indication of which constellation to use, while the terminal device simply follows the indication. This divides the complexity burden to the network side, allowing multiple constellations to be supported without proportionally increasing terminal device complexity.
Solution Approach 2:
The network device acts as an intermediary that manages the constellation selection process. It configures the available constellations and indicates which one should be used for each transmission, shielding the terminal device from the complexity of managing multiple constellations while still enabling optimized modulation performance.
3Adaptability or versatility
If all UEs support every constellation, then adaptability is maximized, but standardization effort and complexity increase
Solution Approach 1:
The patent makes the network device universal by giving it the capability to configure and indicate different constellations for different UEs and different transmission conditions. The terminal device maintains a simpler universal design that follows network indications, allowing the system as a whole to achieve high adaptability without requiring every UE to inherently support all constellation types.
Data Source
AI summary
Embodiments of the present disclosure relate to devices, methods, apparatuses and computer readable storage media for supporting various constellations. According to embodiments of the present disclosure, a first device receives, from a second device, configuration information indicating at least one constellation available for a modulation and coding scheme, MCS. The first device receives, from the second device, control information for a communication between the first and second devices. The control information indicating the MCS. The first device performs the communication with the second device based on the control information using a constellation of the at least one constellation.