Chapters authored
Routing and Traffic Engineering in Dynamic Packet-Oriented Networks
Part of the book: Telecommunications Networks
Network Coding-Assisted Retransmission Scheme for Video- Streaming Services over Wireless Access Networks
Video-streaming services, such as Internet protocol television, promising the delivery of multimedia contents over wireless access networks to clients whenever and wherever, are becoming more and more popular. However, scarce radio resources, lossy characteristics of wireless links and high bandwidth demands pose the never-ending challenges for provisioning of real-time streaming services over wireless networks in a timely and reliable manner. Furthermore, a wireless channel may suffer from interference and multipath fading, which may cause random packet losses. In addition, wireless link layer does not provide a retransmission mechanism for multicast/broadcast traffic. This would significantly impact the clients’ quality of experience of streaming services. Traditional unicast retransmission solutions improve client’s quality, at the bandwidth expense, because every lost packet must be retransmitted separately. This chapter presents and practically evaluates a retransmission scheme for video-streaming services over last mile wireless networks. It is based on network coding techniques that increase the overall performance by means of reducing the number of physical transmissions, in comparison to traditional unicast retransmission approach, resulting in reduced bandwidth consumption. Thus, the Internet service providers can increase the number of clients over the same infrastructure or, alternatively, offer more services to the clients.
Part of the book: Broadband Communications Networks
System Architecture for Intelligent Environment-Aware Wireless Communications
The integration of communications and wireless sensing using the same frequency spectrum is likely to be one of the key features beyond 5G wireless systems, enabling digital transformation to its full potential. Therefore, future wireless communication networks will have to become intelligent, meaning environment-aware, adaptive and parsimonious in terms of radio resources and energy. In this chapter, we propose a system architecture that enables the introduction of intelligent environment-aware wireless communications. Special attention has been paid to the description of the wireless channel in the database with a set of radio rays, generated by the calibrated ray tracing using the ray bouncing method. The proposed approach enables straightforward calculation of the channel impulse response enriched with information about the angle of arrival and angle of departure for the band-limited multiple antenna wireless communication systems. The proposed architecture introduces the concept of local and global agents, used for retrieving associated parameters from the user requirements and the existing radio channel characteristics data.
Part of the book: Advances in Digital Transformation [Working title]