Short-TTI Resource Determination for Low Latency
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Solution Overview
Problem
The existing transmission mechanism in LTE systems, based on a transmission time interval (TTI) of one subframe or 1 ms, cannot meet the latency requirements of emerging services such as those related to the Internet of Vehicles.
Innovation Solution
A data transmission method and system that utilizes a short-TTI data transmission resource, less than the length of one subframe or 1 ms, by determining a time-domain or frequency-domain data transmission resource and sending Downlink Control Information (DCI) to indicate the resource, allowing for more frequent scheduling and reduced latency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a transmission mechanism based on a TTI of one subframe or 1 ms is used, then the system maintains compatibility with existing LTE standards, but it cannot satisfy the latency requirements of emerging services such as the Internet of Vehicles
Solution Approach 1:
The patent segments the traditional 1 ms TTI into multiple shorter TTIs (e.g., 2 slots, 1 slot, or multiple mini-slots within one subframe). This segmentation allows the system to support both legacy services requiring 1 ms TTI and emerging services requiring shorter latencies, thereby resolving the contradiction between reliability for latency-sensitive services and adaptability for diverse service types.
Solution Approach 2:
The patent introduces dynamic TTI length adjustment, where the TTI duration can be flexibly changed based on service requirements. The base station can configure different TTI lengths (short TTI or normal TTI) dynamically, enabling the system to adapt to varying latency requirements of different services while maintaining backward compatibility with existing LTE standards.
2Loss of time
If the TTI is shortened to reduce latency, then the scheduling frequency increases and latency decreases, but the system complexity increases
Solution Approach 1:
The patent changes the time domain parameter of the TTI from a fixed 1 ms duration to variable durations (short TTI or normal TTI). By adjusting this parameter dynamically, the system can reduce latency for time-sensitive services while managing complexity through standardized parameter sets and configuration mechanisms defined in the patent.
Solution Approach 2:
The patent creates a universal scheduling framework that can handle both short TTI and normal TTI transmissions using the same DCI structures and scheduling procedures. This multi-functionality reduces system complexity by avoiding the need for completely separate scheduling mechanisms for different TTI lengths, thereby reducing latency while controlling complexity.
Data Source
AI summary
The present disclosure relates to data transmission methods, apparatus, and systems. One example base station includes at least one processor and a transceiver. The at least one processor is configured to determine a data transmission resource, where the data transmission resource includes a time-domain transmission resource and a frequency-domain transmission resource. The transceiver is configured to send downlink control information (DCI) to a terminal device, where the DCI indicates the time-domain transmission resource, and perform data transmission with the terminal device on the data transmission resource.