Dynamic Frame Structure for 5G Multi-User MIMO Systems
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Solution Overview
Problem
Current 5G communication systems face challenges in providing flexible numerology and efficient channel state information acquisition in multi-user MIMO systems, particularly in dynamic environments where traditional CSI acquisition methods are inefficient and outdated, leading to suboptimal performance and increased energy consumption.
Innovation Solution
The implementation of a dynamic frame structure that includes user pool scheduling, sounding reference signal (SRS) and channel state information-reference signal (CSI-RS) resource configuration, and flexible transmission schemes, allowing for efficient CSI acquisition and precoding in multi-user MIMO systems, enabling adaptive numerology and reduced latency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional CSI acquisition methods are used in multi-user MIMO systems, then system complexity is reduced, but channel estimation accuracy deteriorates and performance becomes suboptimal
Solution Approach 1:
The patent segments the user pool into multiple groups and divides CSI acquisition into sequential phases. Different user groups transmit SRS in different time slots, allowing the base station to acquire channel state information for multiple users without requiring all users to transmit simultaneously. This segmentation resolves the contradiction by achieving accurate multi-user channel estimation while managing system complexity through structured resource allocation.
Solution Approach 2:
The patent implements preliminary SRS transmission from selected user groups before final data transmission. The base station acquires channel state information in advance through scheduled SRS transmissions, performs precoding calculations, and then transmits data with appropriate precoding weights. This preliminary action enables accurate channel estimation to be achieved systematically while controlling complexity through advance planning and resource scheduling.
2Adaptability or versatility
If flexible numerology and dynamic frame structures are implemented, then adaptability and efficiency are improved, but device complexity and processing requirements increase
Solution Approach 1:
The patent implements dynamic frame structures where the base station can flexibly configure and switch between different numerologies (subcarrier spacings, cyclic prefix lengths) and frame formats based on traffic conditions and user requirements. The system dynamically adjusts SRS resource allocations, transmission schemes, and user group configurations. This dynamics principle enables high adaptability while managing complexity through algorithmic control and standardized procedures.
Solution Approach 2:
The patent utilizes parameter changes by allowing the system to adjust key communication parameters such as subcarrier spacing, cyclic prefix type, SRS resource allocation, and transmission power based on channel conditions and service requirements. These parameter changes enable flexible numerology adaptation without requiring fundamentally different system architectures, thus achieving versatility while controlling complexity through parameter tuning rather than structural overhaul.
3Productivity
If user pool scheduling with SRS resource configuration is implemented, then CSI acquisition efficiency is improved, but signaling overhead and processing complexity increase
Solution Approach 1:
The patent merges user pool scheduling information with SRS resource configuration into unified signaling messages. The base station configures multiple user groups with their respective SRS resources, time slots, and transmission parameters through consolidated RRC signaling and DCI formats. This merging reduces the total signaling overhead compared to separate configurations, while maintaining efficient CSI acquisition through integrated resource management.
4Productivity
If dynamic transmission schemes are used for multi-user MIMO, then data transmission efficiency is improved, but energy consumption and processing load increase
Solution Approach 1:
The patent implements periodic SRS transmission schedules where user groups transmit sounding reference signals at predetermined intervals rather than continuously. The base station updates precoding weights and scheduling decisions based on these periodic channel measurements. This periodic action maintains data transmission efficiency by keeping channel state information current while significantly reducing energy consumption compared to continuous transmission and processing.
Data Source
AI summary
A method of a user equipment (UE) in a wireless communication system. The method comprises receiving, from a base station (BS), a dynamic downlink control signal including sounding reference signal (SRS) resource and configuration information based on user pool scheduling information, wherein the UE is included in a user pool group determined by the user pool scheduling information. The method further comprises determining the SRS resource and configuration information included in the user pool scheduling information received by the dynamic downlink control signal and transmitting, to the BS, SRS based on the SRS resource and configuration information included in the user pool scheduling information.