Full-Duplex Device-to-Device Relaying with Self-Interference Cancellation
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Solution Overview
Problem
Existing wireless communication systems face inefficiencies in spectrum utilization due to the limitations of time-division duplex (TDD), frequency-division duplex (FDD), and half-duplex FDD modes, which restrict the use of licensed and unlicensed frequency bands, particularly in 5G systems, leading to underutilization of available spectrum resources and increased competition for access.
Innovation Solution
Implementing full duplex communication with device-to-device cooperation, utilizing self-interference cancellation techniques to enable simultaneous transmission and reception using multiple antennas, allowing for efficient use of both licensed and unlicensed frequency bands, including those above 6 GHz, through protocols like ORS, GSC, and DSTC, and employing self-interference noise calculators and compensation components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If full duplex communication is implemented with simultaneous transmission and reception, then spectrum efficiency is improved, but self-interference between antennas increases
Solution Approach 1:
The patent applies self-interference cancellation techniques that convert the harmful self-interference signal into a beneficial component by measuring and subtracting it from the received signal. The transmitter measures its own transmitted signal through coupling paths and subtracts this measured interference from the received signal at the receiver, thereby eliminating the harmful effect and enabling full duplex operation.
2Productivity
If multiple antennas are used for simultaneous transmission and reception, then communication capacity is improved, but interference management complexity increases
Solution Approach 1:
The patent implements a feedback mechanism where the transmitter measures its own transmitted signal through the coupling paths and feeds this information back to the receiver. The receiver uses this feedback information to calculate and subtract the self-interference component from the received signal, thereby managing the interference systematically without requiring complex real-time coordination between multiple antennas.
3Quantity of substance
If licensed and unlicensed frequency bands are utilized, then spectrum resources are expanded, but competition for access increases
Solution Approach 1:
The patent enables the wireless communication system to operate universally across both licensed and unlicensed frequency bands using the same full duplex communication framework. The self-interference cancellation mechanism is frequency-agnostic and can be applied regardless of whether the system operates on licensed or unlicensed spectrum, allowing efficient utilization of all available spectrum resources without requiring different protocols for different band types.
Data Source
AI summary
Examples described herein include apparatuses and methods for full duplex device-to-device cooperative communication. Example systems described herein may include self-interference noise calculators. The output of a self-interference noise calculator may be used to compensate for the interference experienced due to signals transmitted by another antenna of the same wireless device or system. In implementing such a self-interference noise calculator, a selected wireless relaying device or wireless destination device may operate in a full-duplex mode, such that relayed messages may be transmitted as well as information from other sources or destinations during a common time period (e.g., symbol, slot, subframe, etc.).