Asymmetric TTI Scheduling for Uplink Downlink Delay
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Solution Overview
Problem
Current communication technologies face challenges in reducing transmission delay, particularly in LTE systems, where achieving shorter Transmission Time Intervals (TTIs) leads to high control signaling overhead and low spectrum efficiency, and there is a need for different TTIs for uplink and downlink services to ensure compatibility and efficiency.
Innovation Solution
The method involves determining a reasonable scheduling and feedback time sequence for information transmission using different TTIs for uplink and downlink, allowing for flexible TTI durations in communication systems, including specific timing configurations for FDD and TDD systems to optimize data transmission and feedback.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If a shorter TTI is used to reduce transmission delay, then the transmission delay is reduced, but the control signaling overhead increases and spectrum efficiency decreases
Solution Approach 1:
The patent segments the TTI into different lengths for uplink and downlink directions. By dividing the transmission time into asymmetric segments (shorter downlink TTI, longer uplink TTI), the system reduces downlink transmission delay while managing uplink control signaling overhead through the longer uplink TTI duration.
Solution Approach 2:
The patent applies different TTI quality characteristics to different transmission directions. Downlink uses shorter TTI for low latency requirements, while uplink uses longer TTI to accommodate processing time and reduce control signaling overhead. This local differentiation optimizes overall system performance.
2Loss of time
If different TTIs are used for uplink and downlink to meet different service delay requirements, then service delay requirements are satisfied, but system complexity increases
Solution Approach 1:
The patent implements dynamic TTI configuration where the system can adaptively adjust TTI lengths for uplink and downlink based on service requirements. This dynamic adjustment allows the system to meet varying delay requirements while maintaining manageable complexity through standardized adjustment rules.
Solution Approach 2:
The patent changes the TTI parameter (duration) differently for uplink and downlink directions. By modifying this key parameter asymmetrically, the system satisfies different service delay requirements without requiring complete system redesign, thus controlling complexity.
3Speed
If a shorter TTI is adopted to improve real-time performance, then real-time performance is improved, but spectrum efficiency deteriorates
Solution Approach 1:
The patent applies different TTI quality characteristics to different transmission directions. Downlink uses shorter TTI for low latency requirements, while uplink uses longer TTI to accommodate processing time and reduce control signaling overhead. This local differentiation optimizes overall system performance.
Data Source
AI summary
Provided are a method for transmitting information and a device. The method comprises: a receiving end device receiving, within a first time unit, first information sent by a sending end device; and the receiving end device sending, within a second time unit, second information corresponding to the first information to the sending end device, wherein the duration of the first time unit is different from that of the second time unit. By means of the method for transmitting information in the embodiments of the present invention, when different transmission time intervals are used for an uplink and a downlink or a plurality of types of transmission time intervals are used for a communication system, rational scheduling and a time sequence fed back can be determined for devices at a receiving end and a sending end so as to ensure normal transmission of the information.