Opportunistic Frequency Band Selection for Wireless Propagation Adaptation
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Solution Overview
Problem
Conventional wireless communications systems are typically band-specific, limiting their efficiency and performance across different frequency bands, as they fail to adaptively utilize propagation conditions to maximize range and capacity.
Innovation Solution
A wireless communications system that selectively uses two separately allocated frequency bands based on propagation conditions, allowing for adaptive power levels and time slot configurations to optimize communication, enabling efficient use of spectrum and improving range, capacity, and battery life by tailoring uplink and downlink power capabilities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a wireless system operates in a single frequency band, then the system design is simpler and easier to implement, but the system cannot adapt to different propagation conditions and loses spectrum efficiency
Solution Approach 1:
The system dynamically selects between frequency bands and adjusts power levels based on real-time propagation conditions. The base station monitors signal quality and automatically switches between bands 1 and 2, adjusting transmit power to maximize performance while maintaining simple terminal design.
Solution Approach 2:
The base station is designed to operate in multiple frequency bands with different propagation characteristics, making it universally adaptable to various channel conditions. The system can function as a multi-band base station serving both line-of-sight and non-line-of-sight scenarios without requiring separate systems.
2Productivity
If higher frequency bands are used, then more bandwidth is available for data transmission, but the propagation distance is reduced and performance in non-line-of-sight conditions deteriorates
Solution Approach 1:
The system assigns different frequency bands to different spatial regions and propagation conditions. Lower frequency band 1 is used for distant or non-line-of-sight connections where propagation is challenging, while higher frequency band 2 is used for nearby or line-of-sight connections where capacity is the priority. This local optimization of frequency selection maximizes both distance and throughput where appropriate.
3Length of moving object
If lower frequency bands are used, then propagation distance and non-line-of-sight performance are improved, but the available bandwidth for data transmission is reduced
Solution Approach 1:
The system assigns different frequency bands to different spatial regions and propagation conditions. Lower frequency band 1 is used for distant or non-line-of-sight connections where propagation is challenging, while higher frequency band 2 is used for nearby or line-of-sight connections where capacity is the priority. This local optimization of frequency selection maximizes both distance and throughput where appropriate.
4Length of moving object
If the base station transmits at higher power levels, then the coverage range and signal strength are improved, but the energy consumption increases
Solution Approach 1:
The base station adjusts transmit power levels dynamically based on the selected frequency band and channel conditions. When operating in lower frequency band 1 for distant coverage, the system uses higher power levels to maximize range. When operating in higher frequency band 2 for nearby high-capacity connections, the system reduces power levels, thereby conserving energy while maintaining coverage.
Data Source
AI summary
A base station selectively communicates with terminals using first and second separately allocated frequency bands, e.g., separate cellular/PCS bands, of a government spectrum allocation based on propagation conditions between the base station and the terminals. The base station may transmit in the first frequency band and receive in the second frequency band during a first time slot and transmit in the second frequency band and receive in the first frequency band during a second time slot. The base station may transmit to a terminal in the first frequency band while receiving from the terminal in the second frequency band during the first time slot and may transmit to the first terminal in the second frequency band while receiving from the first terminal in the first frequency band during the second time slot.