Downlink Radio Frame Bandwidth Segmentation for Coverage Uniformity
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Solution Overview
Problem
In wireless communication systems, high-frequency signals suffer rapid attenuation, leading to uneven coverage areas for different types of information, and existing methods using directional beams to improve coverage create further disparities.
Innovation Solution
A downlink transmission method utilizing a radio frame with varying bandwidth, where a first symbol with a low bandwidth is used to transmit common information to enhance coverage, and a second symbol with a higher bandwidth is used for data signals, reducing disparities in coverage areas.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If directional beams are introduced to improve coverage of high-frequency signals, then coverage of specific information types is improved, but the difference between coverage areas of different information types increases
Solution Approach 1:
The patent applies local quality by assigning different bandwidth resources to different information types within the same transmission frame. Common information (synchronization signals, broadcast channels, reference signals) is transmitted using the first bandwidth configuration optimized for coverage, while user data uses the second bandwidth configuration. This allows each information type to have locally optimized transmission parameters suited to its specific requirements, resolving the contradiction between improving high-frequency coverage and maintaining uniformity across different information types.
2Adaptability or versatility
If omnidirectional beams are used to transmit all information types, then coverage uniformity is maintained, but coverage of common information deteriorates at high frequencies
Solution Approach 1:
The patent segments the transmission resources by dividing the radio frame into different symbol types with different bandwidth configurations. The first symbols use a first bandwidth specifically for common information transmission, while the second symbols use a second bandwidth for user data. This segmentation allows common information to receive dedicated bandwidth resources optimized for maximum coverage, preventing coverage deterioration while maintaining the ability to serve multiple information types.
3Productivity
If bandwidth is increased to transmit more information, then data rate is improved, but coverage area of common information decreases
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting the bandwidth parameter for different symbol types within the same transmission frame. The first bandwidth is configured to prioritize coverage area for common information, while the second bandwidth is configured to maximize data transmission rate for user data. This parameter differentiation resolves the contradiction by allowing both high data rates and adequate coverage area to coexist through context-dependent bandwidth selection.
Data Source
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Figure 5A~6B
AI summary
Embodiments of the present invention provide a downlink transmission method, an apparatus, and a system, to improve coverage of different types of information. The method includes: determining a radio frame, where the radio frame includes at least two of a first subframe, a second subframe, and a third subframe, the first subframe includes a first symbol, the second subframe includes a second symbol, the third subframe includes the first symbol and the second symbol, a bandwidth of the first symbol is a first bandwidth, a bandwidth of the second symbol is a second bandwidth, and the first bandwidth is less than the second bandwidth; and performing downlink transmission based on the radio frame. It may be learned from the foregoing descriptions that, the radio frame includes both the first symbol having a relatively low bandwidth and the second symbol having a relatively high bandwidth. Therefore, in the solutions in the embodiments of the present invention, the first symbol and the second symbol can be used to transmit different types of information, to reduce a difference between coverage areas of the different types of information.