Blank Symbol Setting for Multi-Subcarrier Spacing Systems
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Solution Overview
Problem
In 5G communications systems using multiple subcarrier spacings, determining the length of blank symbols for each subcarrier spacing is challenging, leading to reduced spectral efficiency as symbols may not work normally when set based on incorrect lengths.
Innovation Solution
A method where a terminal or base station sets blank symbols by obtaining a reference blank symbol length associated with the minimum subcarrier spacing and using time domain information to set blank symbols for other subcarrier spacings, ensuring complete symbols are set as blank, thereby improving spectral efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If blank symbols are set based on incorrect lengths for different subcarrier spacings, then symbol setting can be performed, but spectral efficiency deteriorates due to symbol malfunction
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting the blank symbol length according to the subcarrier spacing. When the subcarrier spacing changes, the system recalculates and sets the blank symbol length to match the new spacing, ensuring that blank symbols maintain their intended function without causing symbol malfunction while preserving spectral efficiency.
2Manufacturing precision
If a reference blank symbol length associated with minimum subcarrier spacing is used, then accurate blank symbol setting is achieved, but system complexity increases due to multiple subcarrier spacing considerations
Solution Approach 1:
The patent implements universality by establishing a reference blank symbol length based on the minimum subcarrier spacing that can serve as a baseline for all other subcarrier spacings. This reference approach allows the system to handle multiple subcarrier spacings (15kHz, 30kHz, 60kHz, etc.) using a unified methodology, where the reference length is scaled or adjusted according to the actual subcarrier spacing being used, thereby reducing complexity while maintaining precision.
Data Source
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AI summary
Embodiments of this application provide a method and an apparatus for setting a symbol in a communications system that uses a plurality of subcarrier spacings. The method includes: obtaining, by a terminal, a length of a reference blank symbol, where the length of the reference blank symbol is associated with a first subcarrier spacing, and the first subcarrier spacing is a minimum subcarrier spacing in the plurality of subcarrier spacings; and setting, by the terminal based on the length of the reference blank symbol and time domain information of the reference blank symbol, a blank symbol for a subcarrier corresponding to a second subcarrier spacing in the plurality of subcarrier spacings. According to the method and apparatus for setting a symbol provided in the embodiments of this application, when setting, based on the length of the reference symbol, a blank symbol in a subframe corresponding to a subcarrier used by the terminal, the terminal may set one or more complete symbols as blank symbols. This avoids a case in which a symbol cannot work normally because a part of the symbol is set as a blank symbol, thereby improving spectral efficiency of the system.