Adaptive Cyclic Prefix Signal Processing for 5G Latency
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The 3GPP LTE system's frame structure with a 1 ms transmission time interval (TTI) cannot meet the reduced data request latency requirements of 5G technology, which aims for latency 10 times lower than existing systems, particularly for real-time control and tactile internet applications.
Innovation Solution
A method for processing signals in wireless communication systems involves receiving and transmitting information about the length of band pass filters, setting an N FFT window starting point based on adaptive cyclic prefix (CP) length calculations, and performing FFT operations to reduce latency and interference between bands with different filter lengths.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If a fixed frame structure with 1 ms TTI is used, then system compatibility with 3GPP LTE is maintained, but data request latency cannot be reduced to 1 ms as required by 5G
Solution Approach 1:
The patent applies dynamics by making the cyclic prefix length adjustable rather than fixed. The receiver dynamically determines the appropriate cyclic prefix length based on the actual transmission signal characteristics, allowing the system to adapt to different latency requirements while maintaining compatibility with existing frame structures. This enables the system to achieve 1 ms latency when needed without compromising LTE compatibility.
Solution Approach 2:
The patent changes the parameter of cyclic prefix length from a fixed value to a variable parameter that can be adjusted according to transmission requirements. By allowing the cyclic prefix length to change based on the transmission signal's properties, the system can optimize latency performance while maintaining frame structure compatibility with 3GPP LTE specifications.
2Object-affected harmful factors
If band pass filters of different lengths are applied to different bands, then interference between bands is reduced, but signal processing complexity increases
Solution Approach 1:
The patent applies local quality by assigning different cyclic prefix lengths to different frequency bands based on their specific interference characteristics. Each band receives the cyclic prefix length most suitable for its conditions, allowing targeted interference reduction without requiring complex processing across the entire spectrum. This localized approach reduces inter-band interference while managing processing complexity effectively.
Solution Approach 2:
The patent segments the frequency spectrum into different bands, each processed with its own optimized cyclic prefix length. This segmentation allows independent optimization of each band's signal processing parameters, reducing interference between bands while avoiding the need to process the entire spectrum with uniform complexity. The receiver divides the processing task by band, managing overall complexity through structured segmentation.
3Productivity
If adaptive cyclic prefix length is used to reduce latency, then data transmission speed improves, but receiver processing complexity increases
Solution Approach 1:
The patent implements self-service by enabling the receiver to automatically determine the appropriate cyclic prefix length based on the transmission signal's characteristics without requiring complex external control. The receiver uses the actual transmission signal to infer the necessary parameters, allowing adaptive latency reduction while keeping the processing logic contained within the receiver itself. This self-service approach improves transmission speed while managing receiver complexity through autonomous parameter selection.
Data Source
AI summary
A method for a receiving side processing a signal in a wireless communication system according to the present invention may comprise the steps of: receiving, from a transmitting side, information for the length, in a band where the receiving side is allocated, of a band pass filter to be applied to a transmission signal of the transmitting side and the length of the greatest band pass filter applied to a time interval identical to the transmission signal; and on the basis of the information for the length of a band pass filter to be applied to a transmission signal of the transmitting side and the length of the greatest band pass filter applied to a time interval identical to the transmission signal, setting an N Fast Fourier Transform (FFT) window starting point for detecting the transmission signal.