LTE Terminal MSS Band Duplexer Switching
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Solution Overview
Problem
The existing 3GPP LTE and LTE-Advanced systems underutilize the mobile satellite service (MSS) frequency band, leading to inefficient frequency allocation, as the MSS band is not fully utilized for terrestrial communication.
Innovation Solution
A terminal is designed to utilize part of the MSS band by incorporating a selection switch that can drive either a first duplexer for the existing LTE/LTE-Advanced band or a second duplexer for a new MSS band, allowing for the use of non-overlapping or overlapping frequency ranges, with a diplexer and antenna configuration to support bandwidths up to 90 MHz.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the MSS band is allocated for terrestrial wave use (new band 65), then frequency utilization is improved, but device complexity increases due to requiring additional duplexers and selection switches
Solution Approach 1:
The terminal is designed with multi-functionality to support both traditional LTE bands and the new MSS band (band 65) for terrestrial wave communication. The selection switch enables a single terminal to adaptively switch between different frequency bands and duplexer configurations, allowing one device to serve multiple communication purposes without requiring separate dedicated devices for each band type.
Solution Approach 2:
The terminal incorporates dynamic switching capability through the selection switch, which can dynamically select between the first duplexer (for traditional bands) and the second duplexer (for MSS band 65). This dynamic configuration allows the system to adapt to different operating conditions and frequency band requirements in real-time, optimizing performance based on the selected band without permanent structural changes.
2Adaptability or versatility
If a second duplexer is added for MSS band support, then adaptability is improved, but device complexity increases
Solution Approach 1:
By incorporating a second duplexer specifically designed for MSS band 65, the terminal achieves universal compatibility with both traditional LTE frequency bands and the new MSS terrestrial wave band. This multi-functionality allows the same terminal hardware to operate across different band types without requiring separate specialized devices, thereby improving adaptability while managing complexity through integrated design.
3Device complexity
If the bandwidth of the second duplexer is limited to 90 MHz, then device complexity is reduced, but frequency range coverage is restricted
Solution Approach 1:
The second duplexer is designed with a specific bandwidth parameter of 90 MHz, which is optimized for the MSS band 65 terrestrial wave application. This parameter change represents a deliberate design decision to balance performance requirements with device complexity, establishing a standardized bandwidth specification that simplifies the duplexer design while remaining sufficient for the intended frequency range coverage in the MSS band.
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 the efficient use of the MSS band for LTE/LTE-Advanced systems, enhancing frequency utilization and maintaining existing performance requirements without performance deterioration, while supporting carrier aggregation.
Implementation Method 1
a first duplexer for separating a transmission signal and a reception signal in a band 1 defined in long term evolution (LTE)/LTE-Advanced
Implementation Method 2
a second duplexer for separating a transmission signal and a reception signal in a new band 65 which has belonged to a mobile satellite service (MSS) band
Implementation Method 3
a diplexer which is connected to the high band switch and composes and separates carriers
Data Source
AI summary
A disclosure of the present specification provides a terminal which uses a frequency band of a mobile satellite service for LTE/LTE-A. The terminal comprises: a first duplexer for separating a transmitted signal and a received signal in band 1 defined in long term evolution (LTE)/LTE-Advanced; a second duplexer for separating a transmitted signal and a received signal in new band 65 which was a mobile satellite service (MSS) band and now is allocated for the terrestrial service; and a selection switch for selecting one of the first duplexer and the second duplexer. Herein, when only band 1 is configured and used, only the first duplexer may be operated by the selection switch. In contrast, when new band 65 is configured and used, wherein the configured band does not overlap the range of band 1, and when new band 65 is configured and used, wherein the configured band overlaps the range of band 1 for carrier aggregation, only the second duplexer may be operated by the selection switch.