Dynamic TTI Scheduling for LTE Data Transmission
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Solution Overview
Problem
Current communication technologies face challenges in reducing transmission delay, particularly in LTE systems, where shortening Transmission Time Interval (TTI) leads to high signaling overhead and low spectral efficiency, and compatibility issues with existing systems, resulting in resource wastage and incompatibility with certain carrier configurations.
Innovation Solution
A method and terminal that dynamically select and use multiple TTIs for data transmission on the same carrier, allowing for flexible scheduling of Physical Downlink Shared Channels (PDSCH) and Physical Uplink Shared Channels (PUSCH) based on configuration information from the base station, enabling the use of different TTIs to optimize resource utilization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If a uniform TTI is determined for a terminal simultaneously having various services, then the transmission delay requirement for services with minimum delay requirement is met, but resources are wasted
Solution Approach 1:
The patent implements dynamic TTI configuration where the base station can assign different TTI lengths (e.g., 0.5ms or 1ms) to different services or data transmissions based on real-time requirements. This allows the system to adapt TTI duration dynamically rather than using a fixed uniform TTI, thereby meeting delay requirements for urgent services while avoiding resource waste for less time-sensitive transmissions.
Solution Approach 2:
The patent changes the TTI parameter dynamically by introducing configuration information that specifies different TTI lengths for different services. The base station can configure the terminal to use shorter TTIs (e.g., 0.5ms) for services requiring low delay and longer TTIs (e.g., 1ms) for other services, thus optimizing both delay performance and resource utilization through parameter adjustment.
2Loss of time
If a short TTI is used to shorten transmission delay, then the transmission delay is reduced, but signaling overhead increases and spectral efficiency decreases
Solution Approach 1:
The patent introduces a TTI length parameter in the configuration information sent from base station to terminal. This parameter allows flexible adjustment of TTI duration (e.g., switching between 0.5ms and 1ms) based on service requirements and network conditions, enabling the system to use short TTIs only when necessary to minimize signaling overhead while still achieving low latency when required.
Solution Approach 2:
The system dynamically adjusts TTI length based on service type and network conditions rather than using a fixed short TTI. The base station evaluates whether short TTI is necessary and configures appropriate TTI lengths accordingly, thereby reducing unnecessary signaling overhead associated with short TTIs while maintaining the ability to achieve low delay when needed.
3Loss of time
If a carrier supports short TTI transmission, then transmission delay is reduced, but compatibility with existing LTE system cannot be ensured
Solution Approach 1:
The patent implements dynamic TTI configuration where the base station can select between different TTI lengths (0.5ms or 1ms) based on service requirements and network conditions. This allows the system to use short TTIs for low-latency services while maintaining compatibility with existing LTE infrastructure that expects 1ms TTIs, thus achieving both low delay and system compatibility.
Solution Approach 2:
The patent introduces configurable TTI length parameters that allow the system to adapt between different TTI durations. By dynamically adjusting this parameter, the system can support short TTI transmission for services requiring low delay while maintaining compatibility with existing LTE systems through configuration options, avoiding the need for dedicated short-TTI carriers.
Data Source
AI summary
Provided are a method and terminal for data transmission. According to the method, a terminal determines, according to configuration information sent by a base station, to use at least two different TTIs to transmit different PDSCHs and/or PUSCHs on a target carrier. The terminal detects whether first DCI is present in at least one PDCCH in a target subframe on the target carrier, the first DCI being used to schedule at least one PDSCH transmitted in the target subframe on the target carrier. When the terminal detects that the first DCI is not present, or that the first DCI is present and a TTI of the at least one PDSCH scheduled by the first DCI is smaller than the target subframe, the terminal detects dedicated DCI in a dedicated downlink control channel in a target subframe, a TTI of a PDSCH or PUSCH scheduled by the dedicated DCI being smaller than the target subframe.