Ultra-Low Delay Data Transmission via TTI Parameter Optimization
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current mobile communication technologies, such as 4G, fail to meet the requirement for ultra-low delay transmission needed in applications like mobile 3D targets, virtual reality, and intelligent transportation, as they exceed the desired 1 ms delay threshold.
Innovation Solution
A data transmission method and system that utilizes a Transmission Time Interval (TTI) with N symbols, each having a cyclic prefix, where Tmin≤T≤Tmax, Tmin=(13×N×L)/3, and Tmax=200K, to achieve ultra-low delay transmission, with N being a positive integer and L≤6, allowing for efficient processing and channel adaptation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If conventional TTI structures are used in 4G systems, then system compatibility is maintained, but data transmission delay exceeds the ultra-low delay requirement of 1 ms
Solution Approach 1:
The patent changes key parameters of the TTI structure including reducing TTI duration to 200 μs or less, limiting cyclic prefix length L to 6 or less, and constraining the number of symbols N to satisfy N≤└600/(13KL)┘. These parameter modifications enable ultra-low delay transmission while maintaining communication reliability through optimized timing relationships.
2Reliability
If cyclic prefix is added to each symbol for channel protection, then channel robustness is improved, but transmission overhead increases and delay performance deteriorates
Solution Approach 1:
The patent imposes strict constraints on cyclic prefix parameters by limiting the average cyclic prefix length L to 6 or less and requiring each symbol's cyclic prefix not to exceed 2μs. These parameter changes reduce the overhead proportion of cyclic prefix while maintaining channel protection capability, thereby achieving ultra-low delay transmission.
3Speed
If processing time is reduced to achieve ultra-low delay, then transmission speed is improved, but processing accuracy and reliability may be compromised
Solution Approach 1:
The patent performs preliminary optimization of processing timelines by pre-determining the relationship between TTI duration, symbol count N, and cyclic prefix length L. The processing time is optimized in advance to be exactly T≥(13×N×L)/3 μs, which ensures sufficient processing accuracy is maintained while achieving ultra-low transmission delay of 200 μs or less.
4Loss of time
If TTI duration is reduced to 200 μs for ultra-low delay, then delay performance is improved, but the number of transmittable symbols per unit time is constrained
Solution Approach 1:
The patent introduces dynamic flexibility by allowing the number of symbols N to be adjusted within the constraint N≤└600/(13KL)┘ based on actual channel conditions and service requirements. This dynamic parameter adjustment enables the system to adaptively optimize between delay performance and transmission capacity, achieving ultra-low delay while maintaining sufficient productivity.
Data Source
AI summary
A data sending method includes: sending data blocks by taking a TTI as a unit, wherein the TTI includes N symbols with cyclic prefixes, Tmin<=T<=Tmax, Tmin=(13×N×L)/3, Tmax=200/K, N is a positive integer not smaller than 1 and not greater than formula (I), T represents the TTI, L represents an average value of the cyclic prefixes of the N symbols with cyclic prefixes, L<=6, formula (II) represents rounding down, K is a constant, 2<K<=7, and the unit of each of T, L, Tmin and Tmax is microsecond (μs). Also provided are a data receiving method, a data transmission method, a data sending apparatus, a data receiving apparatus, a data transmission system, and a computer storage medium.