Dynamic Pilot Pattern Determination for LTE TTI Optimization
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Solution Overview
Problem
In LTE systems, the existing technologies do not dynamically adjust pilot patterns according to changing Transmission Time Interval (TTI) durations, leading to suboptimal resource utilization and increased pilot overhead.
Innovation Solution
A method and device that dynamically determine a pilot pattern based on TTI duration, adjusting the placement and density of pilots within a TTI to optimize resource utilization and reduce pilot overhead while maintaining transmission performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If pilot density is increased to maintain transmission performance with shorter TTI durations, then transmission reliability is improved, but resource utilization deteriorates due to increased pilot overhead
Solution Approach 1:
The patent implements dynamic pilot pattern determination where the pilot configuration is adjusted according to the actual TTI duration. When TTI is shortened, the system dynamically reduces pilot density and modifies pilot placement patterns (such as using fewer CRS ports or adjusting RB positions) to match the shorter transmission interval, thereby reducing pilot overhead while maintaining adequate channel estimation performance for the actual transmission duration
Solution Approach 2:
The system changes pilot pattern parameters (density, placement positions, resource block allocation) based on TTI duration parameters. For shorter TTIs, pilot density is reduced and pilot RB positions are adjusted to be more sparse, directly changing the physical layer parameters to optimize the trade-off between transmission reliability and resource efficiency for different TTI lengths
2Productivity
If TTI duration is reduced to decrease latency and improve transmission efficiency, then productivity is improved, but pilot overhead increases relative to the shorter transmission interval
Solution Approach 1:
The patent enables dynamic adaptation of pilot patterns to varying TTI durations. When the system uses shorter TTIs to improve transmission efficiency and reduce latency, it simultaneously dynamically adjusts the pilot pattern to use fewer pilots and reduce pilot overhead, ensuring that the pilot resources scale proportionally with the reduced transmission interval rather than remaining fixed
Solution Approach 2:
The system modifies pilot pattern parameters including pilot RB positions, pilot density, and the number of antenna ports transmitting pilots based on the configured TTI duration. For shorter TTIs, the pilot parameters are changed to reduce the absolute number of pilot resources allocated, thereby reducing pilot overhead while maintaining sufficient channel estimation quality for the shorter transmission burst
Data Source
AI summary
A method and a device for determining dynamically a pilot pattern are provided. The method includes acquiring a TTI duration occupied by transmission of data, and determining a pilot pattern according to the TTI duration occupied by the transmission of the data.