Flexible TTI Configuration for LTE Uplink Resource Management
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Solution Overview
Problem
In current LTE systems, shortening the Transmission Time Interval (TTI) to reduce round trip time and data transmission delay leads to insufficient uplink transmission resources for terminal devices, resulting in incomplete data transmission and reduced system capacity.
Innovation Solution
A data communication method where a terminal device receives indication information to transmit information in a second time period with a longer duration than the first time period, allowing for staggered transmission and power management to ensure complete data transmission without overwhelming the network device.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If the TTI is shortened to reduce round trip time and data transmission delay, then the response time is improved, but the terminal device does not have sufficient uplink transmission resources for transmitting information
Solution Approach 1:
The patent applies dynamics by making the TTI duration flexible rather than fixed. The network device can dynamically configure different TTI lengths (first TTI with shorter duration, second TTI with longer duration) based on channel conditions and traffic requirements. This allows the system to adapt between low-latency modes and high-throughput modes, resolving the contradiction between short TTI for reduced latency and long TTI for sufficient resource transmission.
Solution Approach 2:
The patent changes the parameter of TTI duration from a fixed value to a configurable variable. By introducing multiple TTI duration options and allowing dynamic selection through RRC configuration and DCI indication, the system can adjust the TTI parameter to match different operational requirements, thereby balancing latency reduction with sufficient resource allocation.
2Speed
If the TTI is shortened to reduce data transmission delay, then the transmission speed is improved, but the network device cannot obtain complete data, reference signal, or CSI
Solution Approach 1:
The patent uses dynamic TTI configuration to adapt to different transmission requirements. When channel conditions are good and latency is critical, shorter TTIs are used for faster transmission. When reliability is paramount, longer TTIs ensure complete transmission of all information elements. The network device dynamically switches between these modes based on real-time conditions.
Solution Approach 2:
The patent segments the transmission process into different TTI types. Critical control information can be transmitted in shorter TTIs for rapid response, while less time-sensitive data can be transmitted in longer TTIs to ensure completeness. This segmentation allows the system to optimize different parts of the transmission for different goals.
3Loss of time
If the TTI is shortened to reduce transmission delay, then the responsiveness is improved, but the system capacity is reduced
Solution Approach 1:
The patent changes the TTI duration parameter dynamically based on system load and traffic type. During periods requiring high responsiveness, shorter TTIs are activated. During periods prioritizing throughput, longer TTIs are used. This parameter adaptation allows the system to achieve high capacity when needed while maintaining low latency when required.
Solution Approach 2:
The patent implements periodic TTI structure where shorter and longer TTIs can be alternated or used in patterns based on periodic traffic characteristics. This periodic action allows the system to maintain high capacity through efficient resource utilization while periodically switching to shorter TTIs for low-latency requirements.
Data Source
AI summary
Embodiments of the present disclosure provide a data communication method, a terminal device, and a network device. In the solution, a terminal device receives first indication information in a first time period; and the terminal device transmits first information in a second time period, where a duration of the first time period is a first time unit, a duration of the second time period is a second time unit, and a duration of the second time unit is greater than a duration of the first time unit. In this way, although the terminal device receives the first indication information in a first time unit N, the terminal device transmits the first information in a second time unit M whose duration is greater than that of the first time unit.