The next generation wireless networks are expected to converge into a ubiquitous architecture, which includes high-speed cellular networks, wireless local area networks (WLANs), mobile ad hoc networks, peer-to-peer networks, wireless metropolitan area networks (WMANs), etc. The increasing demand of wireless multimedia services has motivated the development of broad wireless access in the hetero...

Video streaming applications over wireless networks have turned out to be immensely popular recently. In this thesis, we first study the buffering schemes for the VBR video streaming in heterogeneous wireless networks. An analytical framework is presented to derive the expected number of jitters and average buffering delay. Through experimenting with a wide range of buffering schemes, we quanti...

The development of smart cities has been the epicentre of many researchers' efforts during the past decade. One of the key requirements for smart city networks is mobility and this is the reason stable, reliable and high-quality wireless communications are needed in order to connect people and devices. Most research efforts so far, have used different kinds of wireless and sensor networks, maki...

We present a novel architecture for wireless awareness to enhance the performance of network applications in heterogeneous communication environments, where both wired and wireless links exist. Wireless awareness is the capability of network applications to be aware of the existence and characteristics of wireless links. The unique features of this research are: (i) wireless awareness is studie...

Wireless Multimedia Sensor Networks (WMSNs) are composed of small devices that are able to capture video or audio information and to transmit it over wireless channels. The development of wireless technologies, such as: WiFi, Bluetooth, Zigbee, and UWB, encourages the emergence of heterogeneous networks. However, only a few existing solutions take into account the constraints of multi-tier and ...

3G-WLAN interworking is an emerging technology for the convergence of heterogeneous wireless networks. Solutions to unified authentication using Universal Subscriber Identity Module (USIM) card are urgent demands for wireless network operators, wireless service providers, and mobile users. However, it is a challenging issue to achieve unified authentication based on current network infrastructu...

Wireless sensor network is a promising technology that plays a vital role in various applications i. e. disaster management, battle field surveillance and monitoring applications. It is especially useful in catastrophic or emergency scenario where human participation may be too dangerous. The sensor networks have evolved over a period of time. The failures are inevitable in wireless sensor netw...

A secure scheme for heterogeneous wireless sensor networks is presented. The wireless sensor networks have some sensor nodes and heterogeneous sensor nodes that have greater power and transmission capability than other nodes have. All kinds of sensor nodes are evenly distributed respectively in entire sensing area that is divided into a number of same cells and logical groups evenly. The pairwi...

In recent years, with the evolution of mobile ad hoc networks the popularity of wireless communications systems can be seen almost everywhere in the form of cellular networks, WLANs and WPANS. Furthermore, even small portable devices are fully equipped with various communication interfaces for building a heterogeneous environment in terms of access technologies. The future heterogeneous environ...

The rapid advancement in wireless over wired has augmented the need for improving theQuality of Service (QoS) over such wireless links. However, the wireless ad hoc networkshave too low bandwidth, and establishing a QoS in these networks is a difficult issue. So,support of quality of service in ad hoc networks is the topical issue among the networkscience researchers. In this research we are go...