Full-Duplex Wireless Links with Self-Interference Cancellation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current wireless communication systems face challenges in efficiently managing HARQ-ACK feedback for PDSCH transmission with early termination and in optimizing full-duplex communications for resilient network connections in 5G and beyond networks.
Innovation Solution
The implementation of advanced resource allocation and scheduling algorithms, combined with self-interference cancellation techniques, enables efficient HARQ-ACK feedback management and full-duplex operations, thereby enhancing network resilience and spectral efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If full-duplex communications are implemented in wireless networks, then spectral efficiency and throughput are improved, but self-interference and system complexity increase
Solution Approach 1:
The patent converts the harmful self-interference signal into a beneficial component by using the transmitted signal itself as a reference for interference cancellation. The self-interference cancellation mechanism processes the known transmitted signal to generate an estimate of the self-interference, which is then subtracted from the received signal, transforming the harmful interference into a useful reference for cancellation.
Solution Approach 2:
The system performs preliminary actions by pre-calculating and preparing self-interference cancellation signals before the actual reception occurs. The transmitted signal is processed in advance to generate interference cancellation references, and the system prepares for full-duplex operation by establishing the necessary signal processing chains before simultaneous transmission and reception begins.
2Adaptability or versatility
If self-interference cancellation techniques are applied, then full-duplex operations are enabled, but processing complexity and computational requirements increase
Solution Approach 1:
The system uses its own transmitted signal to serve the purpose of interference cancellation reference, eliminating the need for external reference signals or additional hardware. The transmitted signal itself provides the necessary information for generating the cancellation estimate, making the system self-sufficient and reducing external dependencies.
Solution Approach 2:
The transmitted signal serves multiple functions simultaneously: it carries the intended communication data and also serves as the reference signal for self-interference cancellation. This multi-functionality reduces the need for separate reference signals and simplifies the overall system architecture by making the transmitted signal universally useful for both communication and interference management.
3Loss of time
If HARQ-ACK feedback is managed with early termination, then latency is reduced, but feedback reliability and accuracy may be compromised
Solution Approach 1:
The system performs preliminary decoding attempts before the complete transmission is received, allowing early termination when successful decoding is achieved. This preliminary action enables the system to stop processing early when the transport block is successfully decoded, avoiding unnecessary waiting for the complete transmission and reducing latency while maintaining reliability through progressive decoding verification.
Solution Approach 2:
The system implements feedback mechanisms where HARQ-ACK information is generated and transmitted as soon as decoding success is confirmed, rather than waiting for the complete transmission cycle. This feedback approach allows the system to provide acknowledgment information promptly when early termination conditions are met, reducing overall feedback latency while maintaining accuracy through verified decoding results.
Data Source
AI summary
An apparatus for an S-BS includes processing circuitry configured to decode configuration signaling from a plurality of S-UEs. The configuration signaling indicates an interference level at each of the plurality of S-UEs from transmissions of an M-BS. An S-UE is selected based on a comparison of the interference level at each S-UE with an interference threshold of each S-UE. Control signaling is encoded for transmission to the selected S-UE via a small cell access (S-AC) communication link. The control signaling is transmitted during the reception of downlink data from the M-BS via a primary backhaul communication link.