In-band Full-duplex Operation Self-interference Cancellation
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Solution Overview
Problem
Current wireless communication systems face inefficiencies in full-duplex operation due to self-interference and limitations in bandwidth utilization, particularly in half-duplex systems, which restricts data throughput and capacity.
Innovation Solution
Implementing in-band full-duplex operation that allows simultaneous transmission and reception in the same frequency band, using self-interference cancellation techniques and real-time feedback mechanisms to dynamically adjust transmission parameters and coordinate transmissions across devices, thereby enhancing system capacity and throughput.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If in-band full-duplex operation is implemented to double bandwidth utilization, then system capacity and throughput are improved, but self-interference between transmission and reception increases
Solution Approach 1:
The patent segments the self-interference cancellation process into multiple stages: analog cancellation in the RF domain, digital cancellation in the baseband domain, and iterative refinement. This multi-level segmentation allows progressive reduction of self-interference while maintaining full-duplex operation
Solution Approach 2:
The patent introduces an intermediary self-interference cancellation mechanism that acts as a mediator between the transmitting and receiving paths. This intermediary system processes and subtracts the estimated self-interference signal from the received signal, enabling simultaneous transmission and reception
2Productivity
If real-time feedback mechanisms are implemented to dynamically adjust transmission parameters, then transmission efficiency is improved, but system complexity increases
Solution Approach 1:
The patent implements feedback mechanisms where receiving devices send acknowledgment signals and channel state information back to transmitting devices. This feedback enables dynamic adjustment of modulation schemes, coding rates, and power levels to optimize transmission efficiency
Solution Approach 2:
The patent employs dynamic transmission parameter adjustment based on real-time channel conditions. Modulation orders, coding rates, and resource allocation are continuously adapted according to feedback, transforming static communication parameters into dynamic variables that respond to changing conditions
3Productivity
If simultaneous transmission and reception in the same frequency band is enabled, then bandwidth utilization is improved, but collision detection becomes more difficult
Solution Approach 1:
The patent implements preliminary collision detection mechanisms before full-duplex transmission begins. Devices perform clear channel assessment and reserve transmission opportunities in advance, preventing collisions before they occur by establishing predetermined transmission slots and interference avoidance protocols
Data Source
AI summary
In some aspects, the disclosure is directed to methods and systems for in-band full-duplex operation. A first device transmits a frame to a second device wirelessly within a first frequency band, in one or more embodiments. In one or more embodiments, the first device detects, while the transmission of the frame is ongoing, feedback from the second device within the first frequency band. In one or more embodiments, the feedback is in response to the ongoing transmission of the frame. In one or more embodiments, the first device determines, responsive to the feedback, whether to stop the ongoing transmission of the frame or to update a transmission parameter for the ongoing transmission within the first frequency band.