Unified RF Front End for TDD/FDD Signal Separation
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Solution Overview
Problem
Current cellular communication systems face challenges in managing mutual interference between access and backhauling channels in relay networks, particularly in TDD configurations, which affects network coverage and efficiency.
Innovation Solution
A unified RF front end that supports both FDD and TDD, allowing for the separation of signal channels and reduction of interference by using distinct frequency bands for access and backhauling communications, enabling the system to operate in multiple bands and configurations without altering standard protocols.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a unified RF front end supporting both FDD and TDD is implemented, then network coverage and efficiency are enhanced, but device complexity increases
Solution Approach 1:
The patent implements a unified RF front end that can operate in both FDD and TDD modes, as well as support multiple frequency bands. This multi-functional design allows a single device to perform multiple communication functions, enhancing network coverage and efficiency while avoiding the need for separate dedicated hardware for each mode, thus managing complexity through consolidation rather than multiplication of components.
Solution Approach 2:
The RF front end incorporates dynamic switching capabilities that allow it to adapt between different operating modes (FDD/TDD) and frequency bands based on real-time communication requirements. This dynamic reconfigurability enables the system to optimize performance for different network conditions while using a single unified hardware platform, resolving the contradiction between versatility and complexity.
2Object-affected harmful factors
If distinct frequency bands are used for access and backhauling communications, then mutual interference is reduced, but frequency spectrum utilization becomes less efficient
Solution Approach 1:
The patent segments the frequency spectrum by allocating distinct frequency bands for access communications and backhauling communications. This segmentation physically separates the two communication functions in the frequency domain, thereby reducing mutual interference between them. The segmented approach allows each function to operate in its dedicated band without causing harmful interference to the other.
Solution Approach 2:
The system dynamically changes frequency parameters by switching between different frequency bands for access and backhauling operations. This parameter change strategy allows the system to optimize interference reduction by selecting appropriate frequency separations while maintaining efficient spectrum utilization through flexible band allocation and switching capabilities.
3Area of stationary object
If relay units operate in areas with poor reception, then network coverage is extended, but signal quality and reliability deteriorate
Solution Approach 1:
The patent introduces relay units as intermediary devices that receive signals from base stations and retransmit them to extend coverage into areas with poor reception. These relay units act as mediators that bridge the gap between the base station and remote users, allowing network coverage to be extended without directly compromising the reliability of the core communication link, as the relay can regenerate and clean up signals before retransmission.
Data Source
AI summary
An RF communication system supporting both TDD and FDD and including an FDD duplexer coupled to an antenna; a first pair of FDD/TDD switches each coupled to the duplexer and to a Tx/Rx switch via a sub-band switch; and a second pair of FDD/TDD switches coupled to the Tx/Rx switch including a first FDD/TDD switch coupled to a baseband processor via an amplifier and down converter and a second FDD/TDD switch coupled to a baseband processor via an amplifier and up converter.