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Zambia has faced economic challenges since the beginning of 2015. The economy has come under strain in 2015 due to climate change. As a result, the water levels in the main source of electricity, the Kariba Dam, have dropped. This has caused a critical power deficit. This problem has negatively affected the economy and has further resulted in reduced GDP for the country. Solar energy is a possible...
Applications are typically offered a single, generic option for end-to-end transport, which most commonly consists of the particular flavor of TCP that runs in the server host. This arrangement does not suit well the diversity of the requirements that individual applications pose on network metrics like throughput and delay. Link-Coupled TCP (LCTCP) is a new transport solution that leverages the architectural...
Recent studies have suggested that the stability of peer-to-peer networks may rely on persistent peers, who dwell on the network after they obtain the entire file. In the absence of such peers, one piece becomes extremely rare in the network, which leads to instability. Technological developments, however, are poised to reduce the incidence of persistent peers, giving rise to a need for a protocol...
We present the design, development, and deployment of an inexpensive, power-efficient, clustered, and scalable wireless sensor network (WSN) testbed. The testbed operates in a harsh environment in which neither GPS nor Internet connectivity are available. We use this testbed to collect real-time data during football games and other major events at Bobby Dodd stadium at Georgia Tech. The sensing devices...
The increasing number of smart vehicles and their resource hungry applications pose new challenges in terms of computation and processing for providing reliable and efficient vehicular services. Mobile Edge Computing (MEC) is a new paradigm with potential to improve vehicular services through computation offloading in close proximity to mobile vehicles. However, in the road with dense traffic flow,...
Mobile edge computing is a novel technique in which mobile devices offload computation-intensive tasks with stringent delay requirements to the edge cloud. However, the limited computational resource in the edge cloud may result in the Quality of Service degradation. In this paper, we address this issue by coordinating the heterogeneous cloud which includes the edge cloud and the remote cloud. Considering...
Software-defined networking and mobile edge caching are promising technologies in next generation mobile networks. This paper proposes to jointly optimize bandwidth provisioning and caching strategies in software-defined mobile networks considering the quality of services and limitations of resources. The proposed scheme aims at maximizing gains from dynamically managing caches and efficiently utilizing...
Integrating mobile-edge computing (MEC) and wireless power transfer (WPT) is a promising technique in the Internet of Things (IoT) era. It can provide massive low-power mobile devices with enhanced computation capability and sustainable energy supply. In this paper, we consider a wireless powered multiuser MEC system, where a multi-antenna access point (AP) (integrated with an MEC server) broadcasts...
In this paper, we propose OWCells, a class of optical wireless cellular data center network architectures in which fixed line of sight (LOS) optical wireless communication (OWC) links are used to connect racks of servers arranged in regular polygonal topologies. We present the OWCell DCN architecture, develop its theoretical underpinnings, and investigate routing protocol and OWC transceiver design...
On functional requirements of atmospheric particle monitoring system, this paper designs a distributed atmospheric particle monitoring system. The proposed system consists of a data acquisition network, embedded gateways, a database server and remote monitoring terminals. The data acquisition network consists of mobile data acquisition nodes and router nodes distributed in monitoring areas which are...
We propose a new approach towards wireless localisation related to scenarios where the device positions are known a priori, however the device IDs are not, and therefore need to be matched using RF methods. We propose a maximum-likelihood based matching algorithm called MLMatch for resolving this problem based on measured RSSI values. Since the search space of node-to-positions permutations grows...
Data center networks (DCNs) continuously evolve to support emerging applications. For instance, server-centric architectures are becoming popular because they improve the modularity and resilience of data centers. In a server-centric DCN, switching functionalities are embedded in each server instead of in dedicated switches. Recently, wireless technologies have been introduced into the design of server-centric...
As an important part of the Internet-of-Things (IoT), machine-to-machine (M2M) communications have attracted great attention. In this paper, we introduce mobile edge computing (MEC) into virtualized cellular networks with M2M communications, to decrease the energy consumption and optimize the computing resource allocation as well as improve computing capability. Moreover, based on different functions...
When we talk about the queueing theory in cellular networks, M/M/1 always comes first, which supposes the inter-arrival time and service time are both exponentially distributed. However, with the prosperity of Mobile Instant Messaging (MIM), many researchers found that the inter-arrival times of users' MIM follow lognormal distribution and there are also many keep-alive(KA) messages produced by the...
Mobile edge computing (MEC) has attracted great interests as a promising approach to augment computational capabilities of mobile devices. An important issue in the MEC paradigm is computation offloading. In this paper, we propose an integrated framework for computation offloading and interference management in wireless cellular networks with mobile edge computing. In this integrated framework, the...
The Internet of Things (IoT) involves the increasing prevalence of objects and entities with the ability to transfer data over the network automatically. The main problem of IoT software system is that the security has not always been considered. This study applies five security design patterns for the development of an IoT software system. The security issue of unsecure application data is addressed...
As the advanced development of directional antenna, wireless technique has been introduced into data center networks, denoted as hybrid data center networks (HDCN). HDCN shows its great potential to mitigate the over-subscription problem in higher level links in traditional data centers.However, how to implement network virtualization in HDCN such that all the wireless links can be sufficiently utilized...
RFID is a reliable technology to identify objects wirelessly. Medical devices are subjected to various tests and a lot of time is spent to search for the corresponding devices. The high personal costs make this a quite expensive venture. Launching wireless tagging systems in the clinical environment is still difficult, because many devices can be sensitive to interferences caused by the electromagnetic...
Remote control of grid tied converters has become important with an increasing number of grid connected energy storage systems. Hence, it is crucial point for utilities to outline the requirements of the communication methods and to find the best communication infrastructure to handle the remotely located converters in a reliable and cost effective manner throughout the operation. The purpose of this...
WBAN (Wireless Body Area Network) plays a fundamental role in telemedicine. However, due to the small size of sensor devices and weak capabilities in data processing/storage, WBAN is limited in application. In order to improve the ability of WBAN system and provide a richer service, the cloud-assisted WBAN has been proposed. Recently, He et al. proposed a method to check the data integrity in cloud-assisted...
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