Flexible Subcarrier-Frequency Mapping for Signal Transmission
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Solution Overview
Problem
Current communications systems face inefficiencies in uplink and downlink transmission due to rigid subcarrier-frequency mapping methods, leading to inter-carrier interference and inflexible use of frequency bands, especially with increasing demand for communication and limited spectrum resources.
Innovation Solution
Implementing a method that allows for flexible subcarrier-frequency mapping, enabling different mapping manners for uplink and downlink transmissions in various periods, thereby reducing inter-carrier interference and improving frequency band utilization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate uplink and downlink transmission designs are used with fixed subcarrier-frequency mapping, then technical requirements for uplink and downlink are met separately, but transmission efficiency is limited and flexibility in signal transmission periods is reduced
Solution Approach 1:
The patent applies dynamics by making the subcarrier-frequency mapping manner changeable over time. The first device dynamically switches between first and second subcarrier-frequency mapping manners in different periods based on transmission direction (uplink/downlink), enabling flexible adaptation to different transmission requirements while improving overall transmission efficiency and resource utilization
Solution Approach 2:
The patent changes the subcarrier-frequency mapping parameter from a fixed state to a variable state. By switching between different mapping manners (first mapping manner for uplink, second mapping manner for downlink) in different periods, the system optimizes transmission performance for each direction while improving overall spectral efficiency
2Device complexity
If fixed subcarrier-frequency mapping manner is used for uplink and downlink, then system configuration is simple, but inter-carrier interference occurs and frequency band utilization is inefficient
Solution Approach 1:
The patent applies local quality by assigning different subcarrier-frequency mapping manners to different transmission directions and time periods. The first mapping manner is used specifically for uplink transmission in the first period, while the second mapping manner is used for downlink transmission in the second period, optimizing each transmission scenario locally to reduce inter-carrier interference
3Ease of manufacture
If rigid subcarrier-frequency mapping method is used, then implementation is straightforward, but frequency band utilization and transmission performance are suboptimal
Solution Approach 1:
The system transitions from a static mapping approach to a dynamic one where the mapping manner adapts to transmission needs. The first device switches between mapping manners based on whether uplink or downlink transmission is occurring, thereby improving frequency band utilization and transmission performance while maintaining reasonable implementation complexity
Data Source
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Figure 3B
AI summary
Embodiments of the present invention provide a signal transmission method and device. The method includes: determining, by a first device according to a first subcarrier-frequency mapping manner, a first frequency corresponding to a first subcarrier that is used for mapping a first signal in a first period, and sending the first signal at the first frequency; and determining, by the first device according to a second subcarrier-frequency mapping manner, a second frequency corresponding to a second subcarrier that is used for mapping a second signal in a second period, and sending the second signal at the second frequency, where the first subcarrier-frequency mapping manner is different from the second subcarrier-frequency mapping manner, and the first frequency and the second frequency belong to a same frequency band. In the embodiments of the present invention, during uplink and downlink transmission, a signal can be transmitted by means of a same subcarrier-frequency mapping manner in a period, thereby improving transmission performance of a system, and improving use efficiency of a frequency band.