Sub-Band Full-Duplex Transceiver Filtering for Self-Interference
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Solution Overview
Problem
Existing communication systems face challenges in managing cross-link interference and self-interference in sub-band full duplex (SBFD) operations, particularly in the 6 GHz frequency band, where simultaneous transmission and reception occur, leading to issues like adjacent channel leakage and receiver desensitization.
Innovation Solution
Implementing a transceiver arrangement with RF sub-band filtering and guard bands to separate uplink and downlink frequency resources, using bandpass filters and circulators to isolate UL and DL sub-bands, and employing flexible duplex slot configurations to manage interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If simultaneous transmission and reception occur in sub-band full duplex operations, then spectral efficiency is improved, but self-interference and adjacent channel leakage increase
Solution Approach 1:
The frequency band is divided into multiple sub-bands with guard bands separating transmission and reception frequencies. This segmentation allows simultaneous TX and RX operations while isolating interference through frequency division, resolving the contradiction between spectral efficiency and self-interference
Solution Approach 2:
Guard bands act as intermediary frequency regions between uplink and downlink sub-bands. These intermediary bands provide isolation and filtering to prevent adjacent channel leakage while maintaining overall spectral efficiency through efficient resource utilization
2Object-affected harmful factors
If guard bands are used to separate frequency resources, then interference is reduced, but frequency spectrum utilization decreases
Solution Approach 1:
Different quality requirements are applied to different frequency regions: guard bands use wider separation for interference protection, while data sub-bands use tighter spacing for efficient utilization. This local differentiation resolves the contradiction by optimizing each region for its specific function
Solution Approach 2:
Guard bands provide more separation than the minimum theoretical requirement, creating a margin of safety against interference. This excessive action in the guard band region ensures interference reduction while the overall system maintains good spectral utilization through efficient sub-band allocation
3Object-affected harmful factors
If flexible duplex slot configurations are employed, then interference management is improved, but system complexity increases
Solution Approach 1:
The system dynamically configures duplex slots based on traffic conditions and interference levels, allowing flexible adjustment of transmission and reception time slots. This dynamic approach improves interference management while the complexity is managed through standardized configuration patterns
Solution Approach 2:
The system changes operational parameters such as slot duration, guard band width, and sub-band allocation based on network conditions. These parameter adjustments enable flexible interference management while maintaining manageable system complexity through controlled optimization
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 approach effectively suppresses self-interference and adjacent channel interference, enabling efficient simultaneous transmission and reception with high interference suppression, up to 100 dB, in SBFD operations.
Implementation Method 1
The transceiver arrangement may comprise a first bandpass filter tuned to a frequency range including the first and second frequency resources
Implementation Method 2
a circulator, said circulator being provided between a power amplifier and the first bandpass filter on a transmit path and the first bandpass filter and a low noise amplifier on a receive path
Implementation Method 3
the first and second frequency resources being separated by a guard band
Implementation Method 4
a low noise amplifier on a receive path
Implementation Method 5
a power amplifier and the first bandpass filter on a transmit path
Data Source
AI summary
An apparatus comprising: means for transmitting one or more signals in one or more first time slots on a first frequency resource to one or more user equipment; and means for receiving one or more signals in one or more second time slots on the first frequency resource from one or more user equipment, and for receiving one or more signals in one or more third time slots on a second frequency resource, the first and second frequency resources being separated by a guard band, wherein the one or more first time slots are different to the one or more second time slots, one or more of the first time slots are the same as one or more of the third time slots.