报告题目：Handover Decision Making for Future Heterogeneous Wireless Networks
报告人：Dr. Li Zhang，University of Leeds
The deployment of a layer of smaller cells, such as Pico cells, and micro cells etc. under an existing Microcell layer creates a multi-layer network of varying cell sizes, often called a Heterogeneous Network (HetNet). An ultra-dense deployment of small cells is adopted in 5G and future wireless networks to cope with the exponentially increased demand of data rate. The terrestrial wireless network can be augmented with the unmanned aerial vehicles (UAVs) to construct a three-tier network. It is envisaged that the UAV-assisted network is a key enabler to support diverse applications with higher capacity and coverage requirements as seen in future wireless networks, for example, supporting disaster responses and being placed in temporary hotspots. Despite the huge benefit can be offered by such networks, they also lead to critical problems of interference, handover, and resource allocation etc. The handover problem, such as frequent handover and increased handover failure rate can consequently cause degraded QoS. This talk will discuss the handover challenges in both the ultra-dense HetNet and UAV aided wireless network and then present a selection of handover decision making methods we proposed recently, including the multiple multiple attribute decision making (MADM) and reinforcement learning (Q-learning) based handover schemes.
Dr. Li Zhang is an Associate Professor and leads the Wireless Communication Group at the school of Electronic and Electrical Engineering, University of Leeds, UK. Her research interest is focused on wireless communications and signal processing techniques, such as massive MIMO, mmWave communications, Heterogeneous Network, UAV aided networks, Device to Device communications and 5G/5G beyond systems etc. She serves as a member of the prestigious UK EPSRC Peer Review College since 2006, and regularly helps reviewing grant applications in different countries and book proposals for a number of publishers. In 2005, she received a Nuffield award for a newly appointed lecturer. In 2006, she became a fellow of Higher Education Academy. In 2011, she was awarded as IEEE exemplary reviewer and in 2012 she was promoted as senior IEEE member.