Mobile Terminal RF Circuit for LTE Band B42 Expansion
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Solution Overview
Problem
Current mobile terminal technologies do not support signal transmission on the LTE band B42, limiting bandwidth extension and information reception capabilities.
Innovation Solution
A mobile terminal with an RF circuit configured for LTE downlink three-carrier MIMO in the 1.7 to 2.7 GHz band and the 3.4 to 3.6 GHz LTE B42 band, featuring a B42 transmitting path with a RF power amplifier and power coupler, and a receiving path with transceiving filters and diplexers connected to multiple antennas.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If current mobile terminal technologies are used, then the terminal can operate in LTE bands B1/B2/B3/B4/B7/B30/B66/B39/B41, but the terminal cannot support signal transmission on the B42 band, limiting bandwidth extension
Solution Approach 1:
The RF circuit is designed to support multiple LTE bands (B1/B2/B3/B4/B7/B30/B66/B39/B41) and the new B42 band simultaneously through a unified architecture. The dual carrier 4×4 MIMO configuration enables the terminal to operate across different frequency bands with a single RF circuit design, achieving multi-band versatility without requiring separate RF circuits for each band.
Solution Approach 2:
The RF circuit is divided into distinct functional modules: a first carrier for 1.7-2.7GHz band operation and a second carrier for B42 band operation (3.4-3.6GHz). This segmentation allows independent optimization and configuration of each carrier's parameters while maintaining overall system coherence, enabling the terminal to handle multiple bands simultaneously.
2Productivity
If dual carrier 4×4 MIMO plus single carrier 2×2 MIMO is implemented, then the downlink data transmission rate reaches 1Gbps, but the platform chip does not support B42 band information transmission
Solution Approach 1:
The RF circuit incorporates dynamic carrier aggregation capability that can selectively activate the B42 band carrier based on network conditions and availability. The system can dynamically switch between different carrier configurations (single carrier 2×2 MIMO or dual carrier 4×4 MIMO) to optimize performance while maintaining B42 band support, allowing the terminal to adapt to varying operational requirements.
3Quantity of substance
If the B42 band is added to support wider bandwidth, then information reception capability is improved, but the RF circuit requires additional components including B42 RF power amplifier, B42 power coupler, and B42 transceiving filter
Solution Approach 1:
The B42 band RF components (power amplifier, power coupler, transceiving filter) are integrated into the existing RF circuit architecture rather than being implemented as completely separate modules. The B42 power coupler shares functional elements with the existing MIMO architecture, and the B42 transceiving filter is combined with the existing filter bank, reducing the overall complexity increase while adding B42 band capability.
Data Source
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AI summary
A mobile terminal and an implementation method for bandwidth extension to the LET band B42. The mobile terminal includes: an RF circuit configured to incorporate LTE downlink three-carrier technology in a 1.7 to 2.7 GHz band, a 4*4 multi-mode multi-band antenna, and a 256 QAM encoding scheme; a B42 transmitting path and a receiving path located on the RF circuit. The B42 transmitting path comprises a B42 RF power amplifier and a B42 power coupler, which are connected to a transmission terminal of the primary antenna on the RF circuit. The receiving path comprises a B42 transceiving filter and a diplexer that are connected to the four antennas of the RF circuit.