Omneya Issa

Communications Research Centre Canada | CRC · Networks and Systems

Public safety networks (PSNs) are very crucial for Public Protection and Disaster Relief (PPDR). Land Mobile Radio (LMR) technologies have been used extensively in the deployment of PSNs so far. LMR networks support sophisticated voice applications that can, to some extent, deal with the mission-critical nature of PPDR services. However, LMR networ...

Cognitive radio (CR) technology offers a promising solution to the spectrum scarcity problem via dynamic spectrum access (DSA). Due to the nature of cooperative cognitive radio networks (CRNs), where two distinct networks are active simultaneously, a significant amount of control messaging is required in order to coordinate channel access, schedule...

This paper proposes a multipath routing optimization algorithm for allocating bandwidth resources to nodes that are subject to interference from flows in other parts of the network. The algorithm consists of three steps: path discovery, path selection and load distribution. In addition to delay, power and hop count, the routing metric also takes in...

Due to the critical importance of Public Safety Networks (PSNs), they must have regular on-site performance evaluation. Conducting tests on real systems are expensive in terms of money, efforts, resources, and time. On the other hand, simulation and emulation tools are very important in the design and modeling of engineering systems. They can play...

Cognitive Radio (CR) technology offers a promising solution to the spectrum scarcity problem via Dynamic Spectrum Allocation (DSA). Due to the nature of Cognitive Radio Networks (CRNs), where two networks are active simultaneously, a significant amount of control messaging is required in order to coordinate channel access, schedule sensing, and est...

Cities use broadband wireless spectrum access technologies to enable a wide range of smart city applications that enhance safety and security, improve efficiency of municipal services and promote a better quality of life for residents and visitors. The most quality and bandwidth-demanding smart city scenarios usually involve video communications. N...

Mobile TV has become a reality offered on several mobile delivery systems. Among them is the Advanced Television System Committee (ATSC) system for mobile and handheld digital television services, known as ATSC Mobile DTV or ATSC M/H, which has moved from standardization to implementation. As the North American broadcast industry is preparing to pr...

High definition content delivery over IP networks has become a reality in the entertainment market. However, such networks are subject to packet loss, especially on the last mile link. This paper presents a roadmap for predicting the packet loss effect on the quality rating. The quality of the delivered video was evaluated objectively in IPTV emula...

TV delivery over IP networks (i.e. IPTV) has emerged as one of the major distribution and access techniques for broadband multimedia services. IPTV adopts H.264 as its coding standard due to its high video compression efficiency as well as powerful error resilience features. This paper presents studies on some of the H.264/AVC error resilience feat...

High Definition (HD) content delivery over IP networks is now a reality in the entertainment marketplace. Such networks can suffer packet loss, especially on the last mile link. This results in time-variant video quality. In this paper we first present an analysis of the human perception of network impairment on HD IPTV quality. Second, we propose...

Quality-of-Experience (QoE) is a human centric notion that produces the blue print of human perception, feelings, needs and intentions while Quality-of-Service (QoS) is a technology centric metric used to assess the performance of a multimedia application and/or network. To ensure superior video QoE, it is important to understand the relationship b...

This paper proposes a new error concealment method in which an improved bidirectional motion copy method is developed to conceal entire frames lost in video transmission. Also an overlapped block motion compensation technique is employed to reduce blocking artifacts in the concealed frames. The simulation results show that the proposed method can a...

A new motion vector extrapolation (MVE) algorithm is proposed to conceal an entire frame loss in low-bit-rate video transmission. The simulation results show that the proposed method provides better video quality at the decoder than existing MVE methods when concealing an entire frame loss.

Worldwide Interoperability for Microwave Access is an emerging wireless access networks offering high data rates and good range. These features, in addition to moderate installation and maintenance costs, make it an appealing last-mile delivery network for IPTV and video applications, especially, in rural regions. However, TV/video delivery must be...

The delivery of High Definition Television (HDTV) over IP networks, namely the HD IPTV, has emerged as one of the major distribution and access techniques for broadband multimedia services. IPTV adopts H.264/AVC as its coding standard due to its high video compression efficiency as well as powerful error resilience features. This paper presents stu...

WiMAX is an emerging wireless access network offering high data rates and good coverage range. This makes it an appealing last-mile delivery network for IPTV and video applications. However, TV/video delivery must be designed with respect to WiMAX characteristics in different environmental conditions. This paper studies the possibility of providing...

High Definition (HD) content delivery over IP networks has become a reality in the market of entertainment technologies. This paper presents a professional testbed deployed to emulate a real use case of delivering high definition TV material over an IPTV network. The quality of the delivered H.264/AVC encoded video was evaluated by common objective...

Admission control and QoS adaptation are the basics of service management in mobile networks characterized by limited resources and bandwidth fluctuation. The link bit rate was the only factor considered by most of research efforts to control admission and to adapt mobile services. Moreover, most of adaptation proposals did not account for interfer...

While the availability of a variety of wireless access technologies already provides users with ubiquitous access to critical content and applications, ensuring a satisfactory Quality of Service (QoS) and high availability further requires reliable delivery schemes that optimally use the available bandwidth. This paper presents a novel architecture...

In wireless mobile environments, where resources are scarce, the basis for quality-of-service (QoS) provisioning is the admission control (AC) of new and handoff subscriber services to avoid future detrimental perturbations of established connections. Most research efforts considered only the bandwidth of the wireless link to control the admission...

In the last few years, Internet Protocol Television (IPTV) has emerged as one of the major distribution technologies for broadband multimedia services. However, the delivery of High Definition Television (HDTV) services over IP networks still faces many challenges. This paper presents a study on quality assessment of HD video content for IPTV appli...

The authors analyze video performance on real 3G networks with respect to fixed networks and propose video profiles for delivering adequate perceptual quality to remote users.

Long wait times after injury and greater distances to travel between accident scenes and medical facilities contribute to increased, possibly unnecessary deaths. This paper describes a mobile emergency system aimed at reducing mortality by improving the readiness of hospital personnel, therefore allowing for more efficient treatment procedures to b...

A variety of wireless access technologies provides todaypsilas users with pervasive access to critical content and applications. Guaranteeing a satisfactory quality of service requires reliable and ubiquitous delivery schemes that optimally use the available access technologies. This paper presents a novel architecture to support adaptive real-time...

The increasing availability of a variety of wireless access technologies provides users with access to critical content and applications. In medical applications, reliability and ubiquity must be guaranteed by new communication technologies in order to favour their adoption. Ensuring a satisfactory quality of service and a high degree of availabili...

Todays' peer-to-peer video communications are no longer restricted to 'talking heads' exchanges; they increasingly involve sightseeing and motion scenes. These new forms of video content are bandwidth-demanding and require some guarantee for a satisfactory quality of experience (QoE). However, QoE becomes a challenging issue in presence of network...

Video-streaming can now be offered on third-generation (3G) mobile networks. Most research efforts have focused on video download. This paper presents a detailed study of challenges faced for successfully deploying applications requiring life video upload. Both subjective and objective qualities as well as the effects of mobility are analyzed on re...

In cellular networks, where resources are scarce, the basis for QoS provisioning is to control the admission of new and handoff subscriber services, to avoid future detriment perturbation of established ones. Most research efforts consider only the bandwidth of the wireless link to control the admission of new services. In this paper, we propose a...

The deployment of third generation (3G) technologies is constantly growing, offering higher wireless capacity which promises broader access to IP applications including rich multimedia content. The deployment of such applications primarily requires the identification of performance characteristics offered by the underlying 3G network. In this paper...

In wireless mobile environments, where resources are scarce, the basis for QoS provisioning is to control the admission of new and handoff subscriber services, to avoid future detriment perturbations of established connections. Most research efforts considered only the bandwidth of the wireless link to control the admission of new services. In addi...

Third generation (3G) technologies are becoming more widely deployed. However, a prerequisite for the successful deployment of such services is the measurement of practical performance characteristics offered by the underlying wireless network (e.g. 3G). This paper presents the results of a number of experiments aiming to identify the performance o...

The 3GPP2 standards gave many new features to cdma2000 to be able to support voice and data services, and established a layered structure for this network, but they left out QoS control as an open question. The aim of this paper is to present a QoS control scheme that exploits some of these new features. The proposed scheme consists of resolving co...