# Honggang Zhang's research while affiliated with Zhejiang University and other places

## Publications (197)

Preprint
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In recent decades, the deployments of cellular networks have been going through an unprecedented expansion. In this regard, it is beneficial to acquire profound knowledge of cellular networks from the view of topology so that prominent network performances can be achieved by means of appropriate placements of base stations (BSs). In our researches,...
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Traffic characterization, learning, and prediction in cellular networks, which is a classical yet still appealing field, yields a significant number of meaningful results. This chapter presents an intensive study on the fundamental traffic nature of mobile instantaneous messaging (MIM) service through a large amount of “Wechat/Weixin” traffic obser...
Preprint
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Faced with the ever-increasing trend of the cellular network scale, how to quantitatively evaluate the effectiveness of the large-scale deployment of base stations (BSs) has become a challenging topic. To this end, a deeper understanding of the cellular network topology is of fundamental significance to be achieved. In this paper, $\alpha$-Shape,...
Preprint
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In a software-defined radio access network (RAN), a major challenge lies in how to support diverse services for mobile users (MUs) over a common physical network infrastructure. Network slicing is a promising solution to tailor the network to match such service requests. This paper considers a software-defined RAN, where a limited number of channel...
Preprint
Software Defined Internet of Things (SD-IoT) Networks profits from centralized management and interactive resource sharing which enhances the efficiency and scalability of IoT applications. But with the rapid growth in services and applications, it is vulnerable to possible attacks and faces severe security challenges. Intrusion detection has been...
Preprint
Ultra-dense network deployment has been proposed as a key technique for achieving capacity goals in the fifth-generation (5G) mobile communication system. However, the deployment of smaller cells inevitably leads to more frequent handovers, thus making mobility management more challenging and reducing the capacity gains offered by the dense network...
Technical Report
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To improve the quality of computation experience for mobile devices, mobile-edge computing (MEC) is a promising paradigm by providing computing capabilities in close proximity within a sliced radio access network (RAN), which supports both traditional communication and MEC services. Nevertheless, the design of computation offloading policies for a...
Preprint
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To improve the quality of computation experience for mobile devices, mobile-edge computing (MEC) is a promising paradigm by providing computing capabilities in close proximity within a sliced radio access network (RAN), which supports both traditional communication and MEC services. Nevertheless, the design of computation offloading policies for a...
Preprint
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Network slicing means an emerging business to operators and allows them to sell the customized slices to various tenants at different prices. In order to provide better-performing and costefficient services, network slicing involves challenging technical issues and urgently looks forward to intelligent innovations to make the resource management co...
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The three articles in this special section focus on the IEEE's Environmental Engineering Initiative (IEEE EEI) that was presented at the United Nations Millennium meeting. To support global environmental sustainability, the IEEE EEI launched a flagship conference, the IEEE International Environmental Engineering Conference, with the first edition l...
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The rapid urbanisation has transformed cities to the preferential human settlement and allowed cities to quietly witness all range of human activities. As the key enabler in the information and communications technology industry, cellular networks play a decisive role in delivering communication messages and entertainment content. In particular, ce...
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To improve the quality of computation experience for mobile devices, mobile-edge computing (MEC) is emerging as a promising paradigm by providing computing capabilities within radio access networks in close proximity. Nevertheless, the design of computation offloading policies for a MEC system remains challenging. Specifically, whether to execute a...
Technical Report
Full-text available
To improve the quality of computation experience for mobile devices, mobile-edge computing (MEC) is emerging as a promising paradigm by providing computing capabilities within radio access networks in close proximity. Nevertheless, the design of computation offloading policies for a MEC system remains challenging. Specifically, whether to execute a...
Article
Full-text available
Traffic prediction plays an important role in evaluating the performance of telecommunication networks and attracts intense research interests. A significant number of algorithms and models have been proposed to learn knowledge from traffic data and improve the prediction accuracy. In the recent big data era, the relevant research enthusiasm remain...
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The articles in this special section focus on green communications and computing (GCC). GCC has been an active and will be a long lasting important field for technological research and development, although, in diff erent stages, GCC may have diff erent focuses and characteristics. In the near future, there will be three diff erent, correlated, and...
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To understand the spatial deployment of base stations (BSs) is the first step to facilitate the performance analyses of cellular networks, as well as the design of efficient networking protocols. Poisson point process (PPP) has been widely adopted to characterize the deployment of BSs and established the reputation to give tractable results in the...
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How to allocate the limited wireless resource in dense radio access networks (RANs) remains challenging. By leveraging a software-defined control plane, the independent base stations (BSs) are virtualized as a centralized network controller (CNC). Such virtualization decouples the CNC from the wireless service providers (WSPs). We investigate a vir...
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The capacity of a wireless network with fractal and hierarchical social communications is studied in this paper. Specifically, we mathematically formulate the self-similarity of a fractal wireless network by a power-law degree distribution $P(k)$, and we capture the direct social connection feature between two nodes with degree $k_{1}$ and $k_... Article This paper will discuss the probabilistic caching strategies in spatially clustered cellular networks. Thanks to the content preference of mobile users, proactive caching can be adopted as a promising technic to diminish the backhaul traffic and to decrease the content delivery latency. However, basically there are two obstacles to accomplish the c... Article Full-text available The capacity of a fractal wireless network with direct social interactions is studied in this paper. Specifically, we mathematically formulate the self-similarity of a fractal wireless network by a power-law degree distribution$ P(k) $, and we capture the connection feature between two nodes with degree$ k_{1} $and$ k_{2} \$ by a joint probabili...
Conference Paper
The space-terrestrial integrated network able to cope with the complex and varied tasks in future communications. However, there are some problems in unified management and cooperative scheduling. In this paper, based on the situation of satellite and terrestrial integrated network, combined with software defined network (SDN), network function vir...
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5G cellular networks are assumed to be the key enabler and infrastructure provider in the ICT industry, by offering a variety of services with diverse requirements. The standardization of 5G cellular networks is being expedited, which also implies more of the candidate technologies will be adopted. Therefore, it is worthwhile to provide insight int...
Conference Paper
The explosion of mobile data traffic has an adverse effect on communication delay and system performance in 5G wireless network. Deploying a number of caches on the base stations(BSs) to cache content has became an essential solution. In this paper, we present a caching structure and propose a CMAC(Cooperative Multicast-Aware Caching) strategy to r...
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In conventional cellular networks, for base stations (BSs) that are deployed far away from each other, it is general to assume them to be mutually independent. Nevertheless, after long-term evolution of cellular networks in various generations, the assumption no longer holds. Instead, the BSs, which seem to be gradually deployed by operators in a c...
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The articles in this special section focus on green communications and green computing exploring the technologies deployed and applications for their use.
Conference Paper
Content Delivery Network (CDN) is an effective solution to offer reliable and efficient content provisioning across the Internet. In order to ensure the service experience, it is critical to adopt efficient routing and server selection techniques in CDN. However, traditional CDN is unable to possess global knowledge of whole network and therefore l...
Conference Paper
With the development of SDN(Software-Defined Networking) and WiFi, it is very important and useful to integrate them under one unified architecture. SDN controller can manage routers, switches and WiFi's APs with standard OpenFlow protocol and provide end-to-end control, by which flexible management strategies can be achieved to satisfy various req...
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Cognitive radio (CR) paradigm with radio frequency energy harvesting (RFEH) have significant potential to improve the network throughput by utilizing vacant spectrum using battery-operated self-sustainable radio terminals. Research efforts relevant to these paradigms are focused on the mode selection policies which decide when to switch from CR mod...
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With the blossoming of network functions virtualization and software-defined networks, networks are becoming more and more agile with features like resilience, programmability, and open interfaces, which help operators to launch a network or service with more flexibility and shorter time to market. Recently, the concept of network slicing has been...
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Traffic learning and prediction is at the heart of the evaluation of the performance of telecommunications networks and attracts a lot of attention in wired broadband networks. Now, benefiting from the big data in cellular networks, it becomes possible to make the analyses one step further into the application level. In this paper, we firstly colle...
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Energy harvesting (EH) has been proposed as a promising technology to extend the lifetime of wireless sensor networks (WSNs) by continuously harvesting green/renewable energy. However, the intermittent and random EH process as well as the complexity in achieving global network information call for efficient energy management and distributed resourc...
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This paper studies the base station (BS) spatial distributions across different scenarios in urban, rural, and coastal zones, based on real BS deployment data sets obtained from two European countries (i.e., Italy and Croatia). Basically, this paper takes into account different representative statistical distributions to characterize the probabilit...
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Under the framework of the United Nations Framework Convention on Climate Change (UNFCCC) and the Conferences of the Parties (COPs), the United Nations Climate Change Conferences have been held yearly to evaluate the progress in dealing with climate change since 1995, when COP 1 was held in Berlin, Germany. COP20, in Lima, Peru in December 2014, re...
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Dynamic event detection by using participatory sensing paradigms has received growing interests recently, where detection tasks are assigned to smart-device users who can potentially collect needed sensory data from device-equipped sensors. Typical applications include, but are not limited to, noise and air pollution detections, people gathering, e...
Conference Paper
In a software-defined radio access network (Soft-RAN), the centralized network controller (CNC) and the wireless service providers (WSPs) are decoupled. Specifically, the CNC schedules resources over time for the mobile terminals (MTs) based on the value functions sent by the WSPs. While the strategic WSPs compete against each other on behalf of th...
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The concept of green information and communications technologies (ICT) is relevant to both environmental sustainability and ICT. Green ICT is an interdisciplinary field relevant to a number of areas and topics, such as information systems, computer science and technologies, communications and networking, power and energy systems, electronics, envir...
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Cellular networks are now nearly universally deployed and are under ever-growing pressure to increase the volume of data deliverable to consumers. Understanding how base stations (BSs) are spatially deployed could prominently facilitate the performance analyses of cellular networks, as well as the design of efficient networking protocols. In this l...
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This paper proposes a distributed cooperative framework for improving the energy efficiency of green cellular networks. Based on the traffic load, neighboring base stations (BSs) cooperate to optimize the BS switching (sleeping) strategies so as to maximize the energy saving while guaranteeing users' minimal service requirements. The inter-BS coope...
Conference Paper
Recently, there has been a surge of interests in paradigms such as device-to-device (D2D) communications and radio frequency energy harvesting (RFEH) to improve the spectrum as well as energy efficiencies of next-generation decentralized cognitive radio networks. However, little attention has been paid to the dual but competing task of subband sele...
Conference Paper
This paper deals with the design of low complexity dynamic spectrum access (DSA) scheme for Cognitive Radios (CRs) to search the vacant band(s) of tunable bandwidth, Bh. The DSA scheme with tunable Bh is very critical for CRs considering the coexistence of multiple communication standards in wideband input signal with channel bandwidths ranging fro...
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A range of applications in cognitive radio networks, from adaptive spectrum sensing to predictive spectrum mobility and dynamic spectrum access, depend on our ability to foresee the state evolution of radio spectrum, raising a fundamental question: To what degree is radio spectrum state (RSS) predictable? In this article we explore the fundamental...
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Environmental issues are increasingly becoming one of central concerns in global societies. The production, application, and disposal of information and communication technology (ICT) platforms and relevant systems may introduce significant environmental problems. These include increasing environmental pollution, the exhaustion of natural resources...
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This paper first provides a brief survey on existing traffic offloading techniques in wireless networks. Particularly as a case study, we put forwards an on-line reinforcement learning framework for the problem of traffic offloading in a stochastic heterogeneous cellular network (HCN), where the time-varying traffic in the network can be offloaded...
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This paper deals with the design of the low complexity and efficient dynamic spectrum learning and access (DSLA) scheme for next-generation heterogeneous decentralized Cognitive Radio Networks (CRNs) such as Long Term Evolution-Advanced and 5G. Existing DSLA schemes for decentralized CRNs are focused predominantly on the decision making policies wh...
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The spatial distribution of base stations (BSs) and traffic demands is essential for efficient network planning and BS sleeping, which are key elements of green cellular networking. This paper investigates their statistics, relation, and modeling, based on large-scale measurement data from commercial cellular networks. The spatial distribution of B...
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Mobile instantaneous messaging (MIM) services significantly facilitate personal and business communications, inevitably consume substantial network resources, and potentially affect the network stability. In this paper, we aim to understand the traffic nature of MIM in cellular networks. Specifically, in order to reach credible conclusions, our res...
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Heterogeneous mobile networks, HMNs, with flexible spectrum use, densified cell deployment, and multi-layer multiple types of radio access technologies, are expected to be key to meeting the 1000 times increase of mobile data traffic in 2020 and beyond. The increasing complexity in HMNs renders the control and coordination of networks a challenging...
Conference Paper
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Demonstration video available at https://youtu.be/Cg3h5vPBv9g Reducing the energy consumption in wireless networks has attracted increasing attention in the last few years. Several research teams around the world are now proposing various solutions for the so-called green wireless networks, i.e. energy-efficient wireless networks. Although the inc...
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Rapid growing demand for mobile data traffic challenges capacities and service provision in the next-generation (5G) cellular networks. Real measurement data from operating cellular networks indicates that the traffic models and scenarios disobey our traditional assumptions (i.e., expressing bursty nature). As a result, current network architecture...