Symbol Alignment in Self-Contained Subframes for 5G Interference Reduction
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Solution Overview
Problem
The existing LTE communication system's subcarrier spacing and Transmission Time Interval (TTI) configuration cannot meet the flexible configuration and low-delay requirements of 5G wireless communication systems, particularly in unlicensed frequency bands, leading to interference between different subcarrier spacings.
Innovation Solution
An electronic device and method that adjust the length of symbols in a self-contained subframe on one subcarrier to align with symbols on another subcarrier, ensuring boundaries of downlink and uplink symbols are aligned within a transmission time interval, thereby reducing interference between different subcarrier spacings.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If different subcarrier spacings are used to meet flexible configuration and low-delay requirements, then adaptability and productivity are improved, but interference between different subcarrier spacings occurs due to misaligned symbol boundaries
Solution Approach 1:
The patent adjusts the symbol length parameter in the first subcarrier spacing scenario so that the adjusted symbol boundaries align with the symbol boundaries of the second subcarrier spacing scenario within the same TTI, thereby reducing interference while maintaining flexible configuration capability
Solution Approach 2:
The patent creates equipotential conditions by aligning the symbol boundaries of different subcarrier spacings to the same time positions, ensuring that symbols from different subcarrier spacings do not interfere with each other during transmission
2Object-affected harmful factors
If symbol length is adjusted to align boundaries across different subcarrier spacings, then interference is reduced, but device complexity increases due to additional adjustment operations
Solution Approach 1:
The patent applies symbol length adjustment only to specific symbols (first symbol or second symbol) in the self-contained subframe rather than all symbols, thereby reducing the complexity of the adjustment operation while still achieving boundary alignment to reduce interference
Data Source
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AI summary
The present disclosure relates to an electronic device and wireless communication method of a wireless communication system. The device comprises: one or a plurality of processing circuits, said processing circuits being configured to execute the following operations: adjusting the length of a symbol in a self-contained subframe under a first sub-carrier, such that within a transmission time interval (TTI) of a self-contained subframe under a second sub-carrier: the edge of each symbol of an uplink symbol and downlink symbol in a self-contained subframe under the second sub-carrier is aligned with the edge of the symbol in the self-contained subframe under the adjusted first sub-carrier; furthermore, the first symbol in the self-contained subframe under the adjusted first sub-carrier is longer than the other non-adjusted symbols in the self-contained subframe under the adjusted first sub-carrier. Using the electronic device and wireless communication method of the present disclosure, it is possible to achieve symbol alignment in situations of different sub-carrier spacing, thereby preventing or reducing interference between different sub-carrier spacings.