Radio Communication Filter Length Control for Guard Band Optimization
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The New Waveform technology for improving frequency use efficiency in 5G mobile communication systems faces challenges due to potential impacts on symbol length and throughput from filter applications, and the determination of optimal guard intervals is crucial for effective filter application settings.
Innovation Solution
An apparatus and method that control and transmit filter length information for limiting guard band widths in radio communication, determining filter lengths based on frequency and time resources, and adaptively apply filters to transmission data to optimize frequency use efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If a filter is applied to improve frequency use efficiency, then frequency use efficiency is improved, but symbol length and throughput may be adversely affected
Solution Approach 1:
The filter length is determined dynamically based on the guard interval length and resource block configuration rather than being fixed. This allows the system to adapt the filter characteristics to different transmission scenarios, optimizing both frequency use efficiency and throughput by adjusting the filter length according to actual channel conditions and resource allocation.
Solution Approach 2:
The patent changes the parameter of filter length to resolve the contradiction. By setting the filter length equal to the guard interval length (or a multiple thereof), the system achieves optimal attenuation of out-of-band emissions while maintaining symbol length compatibility, thus improving frequency use efficiency without degrading throughput.
2Loss of energy
If a filter is applied to limit guard band width, then frequency use efficiency is improved, but symbol length may be affected
Solution Approach 1:
The patent establishes a specific relationship between filter length and guard interval length (filter length = guard interval length or multiple thereof) to ensure that the filtered signal maintains symbol length compatibility. This parameter setting allows the filter to effectively limit guard band width and improve frequency use efficiency while avoiding symbol length distortion.
Solution Approach 2:
The filter is designed with a length that pre-compensates for potential symbol length distortion by matching the guard interval length. This preliminary configuration ensures that the filter's frequency-selective characteristics attenuate out-of-band emissions without introducing harmful phase distortion or symbol length changes to the transmitted signal.
3Object-affected harmful factors
If guard bands are used to reduce power leakage, then power leakage to adjacent systems is reduced, but frequency use efficiency deteriorates
Solution Approach 1:
The patent replaces the traditional mechanical approach of using guard bands (frequency spectrum allocation) with a signal processing approach (filtering). Instead of leaving frequency bands unused to prevent interference, the system applies a filter with length equal to the guard interval to actively suppress out-of-band emissions, thereby eliminating the need for large guard bands and improving frequency use efficiency.
Solution Approach 2:
By changing the filter length parameter to match the guard interval length, the system achieves effective power leakage suppression without requiring traditional guard bands. This parameter optimization allows the filter to provide adequate attenuation of adjacent channel interference while minimizing the impact on usable frequency resources.
Data Source
AI summary
An apparatus including: a communication unit configured to perform radio communication; and a control unit configured to perform control such that control information regarding a filter length of a filter for limiting a width of a guard band in a frequency band to be used in the radio communication is transmitted to an external apparatus through the radio communication. The filter length is determined in accordance with at least one of a frequency resource and a time resource for the radio communication. The apparatus enables a filter improving frequency use efficiency.