is a novel networking paradigm that uses radio frequency (RF) wireless energy transfer (WET) technology to power the information transmissions of wireless devices (WDs). When energy and information are transferred in the same frequency band, a major design issue is transmission scheduling to avoid interference and achieve high communication performance. Commonly used centralized scheduling methods in WPCN may result in high control signaling overhead and thus are not suitable for wireless networks constituting a large number of WDs with random locations and dynamic operations. To tackle this issue, we propose in this paper a distributed scheduling protocol for energy and information transmissions in WPCN. Specifically, we allow a WD that is about to deplete its battery to broadcast an energy request buzz (ERB), which triggers WET from its associated hybrid access point (HAP) to recharge the battery. If no ERB is sent, the WDs contend to transmit data to the HAP using the conventional ppersistent CSMA (carrier sensing multiple access). In particular, we propose an energy queueing model based on an energy decoupling property to derive the throughput performance. Our analysis is verified through simulations under practical network parameters, which demonstrate good throughput performance of the distributed scheduling protocol and reveal some interesting design insights that are different from conventional contentionbased communication network assuming the WDs are powered with unlimited energy supplies. The recent development of RF-enabled WET technology provides a new solution to continuously power energyconstrained wireless devices (WDs) over the air [1], [2] . Wireless power in tens to several hundred of microwatts can be effectively transferred to WDs within ten meters distance, making self-sustainable network operation truly feasible and efficient for many low-power wireless applications, e.g., wireless sensor networks and RF identity (RFID) systems with a large number of WDs. The application of WET to wireless communications spurs a novel networking structure named wireless powered communication network (WPCN), where the WDs transmit information using the energy harvested by means of WET [3] . WPCN removes the need of frequent
The throughput of RF-MAC was then analyzed with the energy queueing model REF .
Distributed scheduling in wireless powered communication network: Protocol design and performance analysis
2017 15th International Symposium on Modeling and Optimization in Mobile, Ad Hoc, and Wireless Networks (WiOpt)
2017 15th International Symposium on Modeling and Optimization in Mobile, Ad Hoc, and Wireless Networks (WiOpt)
Computer Science