User Terminal Numerology Configuration for 5G Latency

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Solution Overview

Problem

Next-generation radio communication systems face challenges in configuring and controlling multiple numerologies with different subcarrier spacings, TTI lengths, and symbol numbers, which are essential for efficient communication across a wide range of frequency bands, particularly in 5G systems where high-frequency bands and IoT/MTC applications require low-latency communication.

Innovation Solution

A user terminal with a control section to manage communication using multiple numerologies with varying subcarrier spacings, where the TTI length and number of symbols per TTI can be adjusted, allowing for flexible configuration and identification of optimal numerologies based on received information, enabling efficient communication across diverse frequency bands.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If multiple numerologies with different subcarrier spacings are introduced to support wide frequency bands and low-latency communication, then adaptability and communication efficiency are improved, but device complexity and control difficulty increase

Engineering Contradiction:

Improveadaptability to different frequency bands and communication servicesVSAvoidcomplexity of configuring and controlling multiple numerologies

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The patent applies parameter changes by dynamically adjusting numerology parameters (subcarrier spacing, TTI length, number of symbols) based on frequency band and service requirements. The base station configures different numerologies with varying parameters to optimize communication for specific bands (e.g., higher subcarrier spacing for high-frequency bands) and services (e.g., shorter TTI for low-latency applications), thereby achieving adaptability without requiring complex hardware modifications.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent implements dynamics by enabling flexible and dynamic selection of numerologies based on real-time communication conditions. The base station can dynamically switch between different numerologies for different component carriers or different time intervals, allowing the system to adapt to changing frequency band requirements and service demands while maintaining manageable complexity through centralized control.

Inventive Principle:

Principle #15Dynamics

2Loss of time

If multiple numerologies with different TTI lengths are configured to reduce latency for specific services, then communication speed is improved, but control complexity increases

Engineering Contradiction:

Improvecommunication latencyVSAvoidcomplexity of managing different TTI lengths

Core Design Contradiction:

Loss of timeVSDevice complexity

Solution Approach 1:

The patent applies parameter changes by configuring different TTI lengths as a variable parameter within the numerology structure. For services requiring low latency (e.g., URLLC), the system configures shorter TTI lengths, while for other services, longer TTIs may be used. This parameter-based approach allows latency optimization without requiring fundamentally different system architectures.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent applies segmentation by dividing the communication system into multiple component carriers, each capable of using different numerologies with different TTI lengths. This allows the system to segment traffic into different carriers based on latency requirements, managing complexity by handling each segment independently rather than requiring unified complex control for all traffic.

Inventive Principle:

Principle #1Segmentation

3Productivity

If different numerologies are used for different component carriers to optimize specific services, then communication efficiency is improved, but difficulty of detecting and measuring increases

Engineering Contradiction:

Improvecommunication efficiencyVSAvoiddifficulty of managing and identifying multiple numerologies

Core Design Contradiction:

ProductivityVSDifficulty of detecting and measuring

Solution Approach 1:

The patent applies preliminary action by having the base station pre-configure and notify the terminal about the numerologies to be used for different component carriers before communication begins. The base station provides advance information about subcarrier spacing, TTI lengths, and other numerology parameters, allowing the terminal to prepare appropriate reception and transmission settings, thereby reducing the difficulty of detecting and measuring multiple numerologies during actual communication.

Inventive Principle:

Principle #10Preliminary action

Data Source

PatentUS11197270B2User terminal, radio base station and radio communication method

Publication Date: 2021.12.07 NTT DOCOMO INC

AI summary

The present invention is designed to allow adequate communication in a next generation communication system in which a plurality of numerologies are introduced. A control section that controls communication using at least one of a plurality of numerologies with different subcarrier spacings, and a receiving section that receives information related to numerology for use in communication are provided, and the plurality of numerologies with different subcarrier spacings are configured that one of the length of a transmission time interval (TTI) and the number of symbols per TTI is different.