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Ph.D. Proposal: Zelin Yun
February 25, 2022 @ 1:00 pm - 2:00 pm EST
Title: Towards a Real-time Wireless Powered Communication Network
Student: Zelin Yun
Major Advisor: Dr. Song Han
Associate Advisors: Dr. Shengli Zhou, Dr. Bing Wang
Review Committee Members: Dr. Suining He, Dr. Walter Krawec
Date/Time: Friday, February 25th, 2022, 1:00 pm
Location: WebEx Online
Meeting link: https://uconn-cmr.webex.com/uconn-cmr/j.php?MTID=m7ad5224b5da19dad84cc8b134b8d682f
Meeting number: 2622 002 5964
Password: mCYg2JpWq35
Join by phone: +1-415-655-0002 US Toll
Access code: 2622 002 5964
Abstract:
Applying emerging wireless powered communication (WPC) technology in wireless network has the potential to reduce the cost of battery usage and maintenance. And the network formed by the WPC devices is so-called wireless powered communication network (WPCN). A WPCN consists of two major components, the wireless devices powered by wireless power are called WPC users, and the device providing the wireless power to and collects data from the wireless devices is called hybrid access point (HAP). Existing works provide theoretical models and give methods to analyze the WPCN performance. However, these works use strong assumptions on the models which can be significantly mismatched when they are applied in real implementations.
To fill the gap between the existing theoretical WPCN models and the real implementations, we propose the implementation and evaluation of a real-time wireless powered network, namely RT-WPCN. To implement the WPCN, a major challenge is the doubly near-far problem. We propose a multi-hop data link layer (DLL) and apply the beamforming technology in the WPC charging system. We further propose a time division multiple access (TDMA)-based data link layer. Based on the system design, we build the model of the system and formulate the minimal user throughput maximization problem for multi-hop RT-WPCN and provide our solutions. The performance of the hardware system and the proposed algorithm are evaluated.
The key design of the WPCN is to improve the throughput at the WPC user side. In RT-WPCN, we improve this through applying beamforming technology and specifically designed user devices and DLL. At the WPC user side, most energy is used on packet transmissions. We further propose an advanced receiver for the wireless communications between the WPC users and the access point (AP) at the AP side. The advanced receiver has a better packet delivery ratio than the commercial off-the-shelf hardware so that the WPC users are able to use lower transmitting power but the AP still can receive the packets from WPC users correctly.
With RT-WPCN implementation, a disadvantage is that the coverage of the network is limited by the wireless charger since the charging power attenuates along with the square of the charging distance. To solve this issue, we add a mobile hybrid access point (HAP) to the WPCN as the ongoing work. The mobile HAP moves along a trajectory, charges the WPC users and collects data from them. Due to the mobility of the HAP, the coverage of the network will significantly increase. There are two major issues to be solved in mobile HAP, one is the trajectory design which is also related to the schedule design, the other is the communication of the mobile HAP. The information exchanging of the mobile HAP requires higher throughput. In the meantime, the communication also has real-time requirements since the mobile HAP has to support the RT-WPCN.
