Terminal D2D Cellular Duplexer Switch Architecture
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Solution Overview
Problem
Device to Device (D2D) communication and cellular communication in 3GPP LTE/LTE-Advanced systems face interference issues due to shared frequency bands, necessitating a solution for simultaneous and interference-free operation.
Innovation Solution
A User Equipment (UE) design incorporating multiple duplexers and switches to separate and manage transmission and reception signals across different frequency bands, allowing for simultaneous D2D and cellular communication while minimizing interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If D2D communication and cellular communication share the same frequency band, then spectrum utilization is improved, but interference between D2D signals and cellular signals increases
Solution Approach 1:
The patent divides the frequency band into multiple sub-bands using band switches and duplexers. Each sub-band can be independently allocated to D2D communication or cellular communication, allowing simultaneous operation while preventing interference. The segmentation of RF resources enables flexible resource allocation without mutual interference between the two communication types.
Solution Approach 2:
The patent introduces band switches and duplexers as intermediary components between the antenna and the communication interfaces. These intermediaries dynamically route signals to appropriate frequency sub-bands, acting as mediators that prevent direct interference between D2D and cellular signals while maintaining efficient spectrum utilization.
2Object-affected harmful factors
If separate frequency bands are used for D2D and cellular communication, then interference is reduced, but spectrum utilization efficiency decreases
Solution Approach 1:
The patent employs dynamic band switching mechanisms that can adaptively allocate frequency sub-bands to D2D or cellular communication based on real-time requirements. The band switches dynamically change connection states to optimize resource allocation, allowing the system to transition between isolation and sharing modes as needed, thus achieving both low interference and high spectrum utilization.
Solution Approach 2:
The patent changes the operational parameters of the RF system by dynamically adjusting which frequency sub-bands are active for which communication type. By changing the frequency allocation parameters in real-time through band switching, the system optimizes both interference reduction and spectrum utilization efficiency according to current communication demands.
3Object-affected harmful factors
If multiple duplexers and band switches are added to the UE structure, then interference isolation between D2D and cellular communication is improved, but device complexity increases
Solution Approach 1:
The patent designs the band switches and duplexers to serve multiple functions: they simultaneously support both D2D and cellular communication interfaces, handle both transmission and reception paths, and enable dynamic resource allocation. This multi-functionality reduces the need for separate dedicated components for each communication type, thereby limiting the increase in device complexity while achieving effective interference isolation.
4Adaptability or versatility
If band switching is implemented dynamically, then resource allocation flexibility is improved, but control complexity and signal switching losses increase
Solution Approach 1:
The patent implements preliminary configuration of band switch states based on predicted communication patterns and QoS requirements. By pre-establishing appropriate band allocations and switch configurations before actual communication needs arise, the system reduces real-time control complexity while maintaining high resource allocation flexibility. The band switches can quickly transition between pre-configured states without requiring complex real-time calculations.
Data Source
AI summary
One disclosure of the present specification provides a terminal capable of simultaneously performing a cellular communication and a D2D communication. The terminal comprises: a first duplexer for separating a transmission signal and a reception signal in a first band for LTE/LTE-Advanced based cellular communication; a second duplexer for separating a transmission signal and a reception signal in a second band; a third duplexer for separating a transmission signal and a reception signal in a third band; and a first band switch for selecting one of the first duplex, the second duplex and the third duplex, wherein when the first band is only used for the cellular communication and the second band is disabled, the second duplex uses the second band for device to device (D2D) communication, and the first band and the second band may correspond to a different inter-band to each other.