Liang Zhang

• Doctor of Engineering
• New Jersey Institute of Technology

In this work, we study the problem of deploying and operating correlated data-intensive vNF-SCs in inter-datacenter elastic optical networks. Requiring for a set of correlated data-intensive vNF-SCs, the service completion time (SCT) of a network service is related to the maximum branch completion time of those vNF-SC branches, making the correlati...

Unmanned aerial vehicles (UAVs) are playing a critical role in provisioning instant connectivity and computational needs of Internet of Things devices (IoTDs), especially in crisis and disaster management. In this work, we focus on optimizing trajectories of UAVs along which IoTDs are served with communication and computing resources in multiple ti...

Drone-mounted base-station ( DBS ) can empower 5G and beyond networks with additional flexibility and maneuverability, and laser charging can potentially extend the DBS's flight time. We propose a laser charging enabled DBS framework in which a laser charging station on the ground constantly transmits energy to a quadrotor DBS in the air and the D...

Mobile edge computing (MEC) is leveraged to reduce the latency for the computation-intensive and latency-critical tasks offloaded from wireless devices and Internet of Things Devices (IoTDs). Unmanned aerial vehicles (UAVs) have attracted much attention from both academia and industry attributed to high mobility, high flexibility, and high maneuver...

Advances in wireless communications are empowering the emerging Internet of Things (IoT) applications and services with billions of connected devices. Mobile edge computing (MEC) has been proposed to reduce the round trip delay of these applications as IoT devices may have limited computing resources and the resource-rich mobile cloud may be far aw...

In mobile access networks, different types of Internet of Things (IoT) devices (e.g., sensor nodes and smartphones) generate vast traffic demands, thus dramatically increasing the traffic loads of their connected access nodes, especially in the 5G era. Considering the possible traffic congestion of the access nodes, drone base stations (DBSs) can b...

Drone-mounted base stations (DBSs) are promising means to provide ubiquitous connections to users and support various emerging applications in mobile networks while full duplex communications has the potential to improve the spectrum efficiency. In this paper, we investigate the backhaul-aware uplink communications in a full-duplex DBS-aided HetNet...

Drone-mounted base stations (DBSs) are promising solutions to provide ubiquitous connections to users and support many applications in the fifth generation of mobile networks while full duplex communications has the potential to improve the spectrum efficiency. In this paper, we have investigated the backhaul-aware uplink communications in a full-d...

Drone-mounted base-stations (DBSs) are promising complements and substitutes of the terrestrial base-stations. We investigate the problem of Placement and cOmmunications in the DBS-aided heterogeneous network (POD) with tier-1 backhaul using free space optics communications and tier-2 backhaul utilizing in-band full-duplex communications to provide...

The future 5G network is expected to provide throughput 1000 times and spectrum efficiency 10 times those of the current 4G network. In-band full-duplex (IBFD) is a promising technique for 5G that can conceivably improve spectrum efficiency. Drone-mounted Base-Stations (DBSs) provide high mobility and high flexibility, and leveraging DBSs to provis...

Drone-mounted base-stations (DBSs) characterized by high mobility and low cost intrinsic attributes can be deployed to enhance the network capacity in order to relieve the mismatch between the large amount of user demands and the limited wireless resources. In this article, we propose a DBS-assisted in-band full-duplex (IBFD) HetNet framework for 5...

Drone-mounted base-stations (DBSs) have attracted much attention because of its mobile, flexible and low-cost networking features. In-band full-duplex (IBFD) is a promising technology to potentially double the spectrum efficiency, and thus equipping DBSs with IBFD to provision services may increase throughput and reduce the number of required DBSs...

Drone-base-stations (DBSs) can potentially provision low-cost and flexible networking with high mobility while in-band full-duplex (IBFD) can conceivably improve spectrum efficiency. It is therefore logical to employ DBSs with IBFD in a cellular network to improve the network throughput. We decompose this problem into the DBS placement problem and...

Datacenters (DCs), deployed in a large scale to support the ever increasing demand for data processing applications, consume tremendous energy. Powering DCs with renewable energy can effectively reduce the brown energy consumption. Owing to geographically distributed deployment of DCs, the renewable energy generation and the data processing demands...

We propose a channel bonding system structure and algorithms for 100 Gb/s PON. The algorithms schedule FEC codeword transmission among four 25 Gb/s wavelength channels, and they are demonstrated with high efficiency and low latency.

Elastic optical networks (EONs) play an important role for the next generation core networks, especially for supporting cloud computing. However, network traffic has been growing exponentially and almost reached the physical capacity limit of single-mode fibers. Space division multiplexing (SDM) can be potentially employed to increase the fiber cap...

This article discusses the technologies for realizing highly efficient data migration and backup for big data applications in elastic optical inter-data-center (inter-DC) networks. We first describe the impacts of big data applications on underlying network infrastructure and introduce the concept of flexible-grid elastic optical inter-DC networks....

Datacenters (DCs) are deployed in a large scale to support the ever increasing demand for data processing to support various applications. The energy consumption of DCs becomes a critical issue. Powering DCs with renewable energy can effectively reduce the brown energy consumption and thus alleviates the energy consumption problem. Owing to geograp...

In this paper, we consider to apply a joint defrag-mentation (DF) of spectrum and computing resources in the inter-datacenter (inter-DC) networks built over elastic optical infrastructure based on the optical orthogonal frequency-division multiplexing (O-OFDM) technology. We propose joint DF algorithms that consist of a request selection strategy t...

Since the optical orthogonal frequency-division multiplexing (O-OFDM) technology can facilitate agile spectrum management, the elastic optical infrastructure based on it has become a promising candidate for the physical-layer of inter-datacenter networks. In this paper, we investigate dynamic anycast in such networks. Firstly, we design three metri...

Empowered by the optical orthogonal frequency-division multiplexing (O-OFDM) technology, flexible online service provisioning can be realized with dynamic routing, modulation, and spectrum assignment (RMSA). In this paper, we propose several online service provisioning algorithms that incorporate dynamic RMSA with a hybrid single-/multi-path routin...

We propose several novel dynamic routing, modulation and spectrum assignment (RMSA) algorithms for high-throughput service provisioning in spectrum-sliced elastic optical networks. The proposed algorithms can be applied to network provisioning, where a network operator needs to figure out an efficient way to serve each dynamic connection request ba...

In this paper, we investigate energy-efficient resilience designs for the translucent optical networks using mixed regenerator placement (MRP). We consider both static and dynamic traffic scenarios and aim to provide 100% restoration against single-link failures while minimizing the total energy-cost on regenerators. For static traffic scenarios, w...

In this talk, we discuss several novel dynamic routing, modulation and spectrum assignment algorithms for high throughput service provisioning in elastic optical networks. The simulation results indicate that the proposed algorithms achieve larger resource utilization.