Flexible Numerology in Multi-User MIMO Systems
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Solution Overview
Problem
Current multi-user MIMO systems in wireless communication lack flexibility in adapting numerology parameters such as subcarrier spacing and cyclic prefix length, which limits their ability to support diverse user requirements and high-speed mobility, especially in 5G communication systems aiming for higher data rates and low latency.
Innovation Solution
The implementation of user equipment (UE) and base station (BS) configurations that allow for flexible numerology, where UE determines preferred transmission parameters including subcarrier spacing and transmits reports to BS, enabling BS to transmit downlink signals using multiple baseband signal generation chains with different numerologies, thereby supporting diverse user requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a fixed numerology configuration is used in multi-user MIMO systems, then system complexity is reduced, but adaptability to diverse user requirements and high-speed mobility is limited
Solution Approach 1:
The patent implements dynamic numerology configuration where the base station determines different numerologies (subcarrier spacing, cyclic prefix length) for different user groups based on their channel conditions and mobility requirements. This allows the system to adapt to diverse user requirements while maintaining manageable complexity through structured group-based configuration
Solution Approach 2:
The patent segments users into different groups based on their channel characteristics and mobility patterns, assigning different numerologies to each group. This segmentation enables targeted optimization for high-speed users while maintaining standard configurations for other users, improving overall adaptability without uniformly increasing system complexity
2Loss of time
If standard subcarrier spacing is used, then system implementation is simplified, but latency is increased for high-speed users
Solution Approach 1:
The patent applies local quality by configuring wider subcarrier spacing specifically for high-speed mobile users who experience rapid channel variations, while standard subcarrier spacing is maintained for users with stable channels. This localized optimization reduces latency for high-speed users without unnecessarily complicating the overall system
Solution Approach 2:
The system dynamically selects subcarrier spacing based on user mobility status and channel conditions, switching between standard and extended numerologies as needed. This dynamic adaptation allows the system to minimize latency for high-speed users while maintaining implementation simplicity for the majority of users
3Productivity
If UE-specific subcarrier spacing is implemented, then spectral efficiency is improved, but device complexity increases
Solution Approach 1:
The patent implements UE-specific numerology configuration where each user equipment is assigned optimal subcarrier spacing and cyclic prefix length based on its channel conditions and mobility requirements. This dynamic UE-specific configuration improves spectral efficiency by matching parameters to actual channel characteristics while the base station manages the complexity of configuration and coordination
Data Source
AI summary
A method of base station (BS) in a wireless communication system. the method comprises identifying a set of transmission parameters comprising a numerology, wherein the numerology includes a subcarrier spacing, determining a plurality of baseband signal generation chains each of which includes the set of transmission parameters comprising different numerology, and transmitting, at least one user equipment (UE), downlink signals comprising the set of transmission parameters using a multi-user multi-input multi-output (MU-MIMO).