Ambient Backscatter and Wake-Up Receiver Enabled SWIPT Cooperative Communication

Abstract

Low power consumption is critical for wireless communication, particularly for the Internet of Things (IoT) applications. Addressing these energy conservation requirements, 5G-Advanced (5G-A) introduces the Reduced Capability (RedCap) concept, incorporating techniques such as Discontinuous Reception (DRX), Extended DRX (eDRX), Wake-up Signal (WUS), and Wake-up Receiver (WUR). Nevertheless, there remains scope for further optimization. Focusing on improving energy efficiency for 5G-A and 6G, in this study we propose a simultaneous wireless information and power transfer (SWIPT) cooperative communication scheme leveraging environment backscattering and wake-up receiver technology, specifically designed to enhance the energy conservation performance of IoT devices and the energy efficiency of communication links, while extending the application scenarios for WUS. By establishing a backscattering system comprising a base station, a sensor equipped with a WUR module, and a receiving terminal, the system harvests both energy and information from ambient sources utilizing SWIPT technology. This approach reduces the sensor’s communication power consumption and formulates an energy efficiency optimization problem for the communication link, subject to constraints on base station transmit power and the power splitting ratio. This research ultimately maximizes communication link energy efficiency with WUS participation, satisfying current IoT energy conservation requirements and contributing significantly to the sustainable development of batteryless IoT and future communication networks.