Frequency Translation in Virtualized Distributed Antenna Systems
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Solution Overview
Problem
Wireless communication networks face challenges in managing frequency bands due to hardware limitations in Base Transceiver Stations (BTS), which restrict the ability to adjust or expand frequency ranges without upgrading equipment, leading to inflexibility in responding to changing demands and regulations.
Innovation Solution
The implementation of a virtualized Distributed Antenna System (DAS) using software-configurable radio (SCR) technology, where signals are translated between different frequency bands at Digital Access Units (DAU) and Digital Remote Units (DRU), allowing dynamic control of frequency bands without physical changes to BTS equipment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If BTS equipment is used with fixed frequency bands, then hardware simplicity is maintained, but frequency band flexibility is reduced
Solution Approach 1:
A frequency translation unit is introduced as an intermediary component between the BTS and the antenna. This unit translates signals from the first frequency band (used by BTS) to the second frequency band (used by antenna), enabling frequency band flexibility without requiring the BTS itself to be reconfigured. The intermediary handles the frequency conversion, keeping the BTS hardware simple while achieving adaptability.
Solution Approach 2:
The system is segmented into distinct functional components: the BTS (handling base frequency operations), the frequency translation unit (handling frequency conversion), and the antenna (handling target frequency operations). This segmentation allows each component to be optimized independently, with the BTS maintaining hardware simplicity while the translation unit provides the necessary frequency band flexibility.
2Adaptability or versatility
If new BTS equipment is purchased to support additional frequency bands, then frequency band capability is expanded, but cost and complexity increase
Solution Approach 1:
Instead of purchasing new BTS equipment to support additional frequency bands, the system creates a virtual copy of the frequency translation capability through software-configurable radio technology. The frequency translation unit effectively copies the frequency conversion function, allowing existing BTS hardware to support multiple frequency bands without physical upgrades.
Solution Approach 2:
The frequency translation unit utilizes software-configurable radio technology to dynamically change operating parameters (frequency bands) without physical hardware changes. By adjusting software parameters rather than replacing hardware, the system achieves frequency band expansion at minimal cost while maintaining ease of manufacture.
3Adaptability or versatility
If BTS is configured to operate in specific frequency bands, then hardware configuration is simplified, but network adaptability to changing demands is reduced
Solution Approach 1:
The frequency translation unit introduces dynamic adaptability to the system. It can dynamically adjust frequency translations based on changing network demands, user device requirements, and regulatory conditions. This dynamic capability allows the network to adapt to varying conditions without reconfiguring the BTS hardware, maintaining configuration simplicity while enhancing adaptability.
Solution Approach 2:
The frequency translation unit serves multiple functions: it translates frequencies for different bands, supports multiple user devices with different frequency capabilities, and adapts to changing regulatory requirements. This multi-functionality provides network adaptability without increasing BTS configuration complexity, as the translation unit handles diverse requirements centrally.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This solution enables flexible adjustment and expansion of frequency bands in response to new devices, regulations, and network demands, enhancing network adaptability and efficiency without the need for physical upgrades or new equipment.
Implementation Method 1
translate at least one of the processed signals to one or more second frequency bands different than the one or more first frequency bands
Data Source
AI summary
A method for communicating with wireless user devices includes receiving a signal at a DAU, the signal residing within a first frequency band and processing the signal at the DAU. The method also includes transmitting the processed signal from the DAU and receiving the transmitted signal at a DRU. The method further includes converting the signal to a second frequency band different than the first frequency band.