K. Ioannou

Optimizing the handover call blocking probability in cellular networks with high speed moving terminals

This letter presents a two-layer cellular architecture which optimizes the handoff blocking probability performance of high-speed moving terminals (HSMT) in a congested urban area. The lower layer of the proposed architecture is based on a microcellular solution, for absorbing the traffic loads of both the low-speed moving terminals (LSMT) and the new calls of HSMT. The higher layer is based on a macrocell umbrella solution, for absorbing the traffic load of the existed handoff calls of the HSMT. The results show that using the optimum number of channels in each layer, the handoff call blocking probability of the HSMT is optimized having the minimum effect on the call blocking probability of the microcellular layer.

Wireless Technologies for Ambient Assisted Living and Healthcare: Systems and Applications

ABSTRACT This chapter presents the concept of Smart Home, describes the Smart Home networking technologies and discusses the main issues for ensuring security in a Smart Home environment. Nowadays, the integration of current communication and information technologies within the dwelling has led to the emergence of Smart Homes. These technologies facilitate the building of Smart Home environments in which devices and systems can communicate with each other and can be controlled automatically in order to interact with the household members and improve the quality of their life. However, the nature of Smart Home environment, the fact that it is always connected to the outside world via Internet and the open security back doors derived from the household members raise many security concerns. Finally, by reviewing the existing literature regarding Smart Homes and security issues that exist in Smart Home environments, the authors envisage to provide a base to broaden the research in Smart Home security.

Optimizing the QoS of high speed moving terminals in cellular networks

This paper presents a dynamic guard channel assignment technique based on a two-layer cellular architecture which optimizes the blocking probability performance of high-speed moving terminals (HSMT) and handoff calls of low-speed moving terminals (LSMT), in a congested urban area. The lower layer of the proposed architecture is based on a microcellular solution, for absorbing the traffic loads of LSMT. The higher layer is based on a macro-cell umbrella solution, for absorbing the traffic load of the HSMT. The results show that using the optimum number of channels and adjusting dynamically the number of guard channels in each layer, the blocking probability of the HSMT and the handoff blocking probability of LSMT is optimized having the minimum bad effect on the new call blocking probability of LSMT. Copyright

Handbook of Research on Heterogeneous Next Generation Networking: Innovations and Platforms

This edited work presents state-of-the-art research, developments, and integration activities in combined platforms of heterogeneous wireless networks. It identifies key issues facing next generation networks and highlights promising technologies.

Optimizing the QoS of Ultra High and High Speed Moving Terminals in Satellite-Aided Cellular Networks

This paper presents a new channel assignment technique based on a three-layer cellular architecture which optimizes the QoS of Ultra High-Speed (UHSMT) and High-Speed Moving Terminals (HSMT) in a congested urban area. The lower layer of the proposed architecture is based on a microcellular solution, for absorbing the traffic loads of Low Speed Moving Terminals (LSMT). The second layer is based on a macro-cell umbrella solution, for absorbing the traffic load of the HSMT. The higher layer is based on satellite cell and absorbs the traffic load of UHSMT. The results show that assigning the optimum number of channels in every layer, the QoS of UHSMT and HSMT are optimized, having a small bad effect on the QoS of LSMT.

Power efficient radio bearer selection for MBMS users in soft handover status

Multimedia Broadcast Multicast Services (MBMS) has been introduced in Third Generation Partnership Project (3GPP) Release 6 in order to address the need for efficient usage of the radio resources in multicast mode of UMTS. From the radio perspective, MBMS includes point-to-point (PTP) and point-to-multipoint (PTM) transmission modes. With PTP transmission mode one Dedicated channel (DCH) is established for each MBMS user within the cell. With PTM transmission mode one Forward Access Channel (FACH) is established covering a part of cells area and commonly shared by all the MBMS users within. In this paper we investigate the MBMS multicast mode under soft-handover condition in a cell and propose a mechanism that selects the transport radio bearer under soft-handover (SH) mode which reduces the Node Bs transmission power.

An Alternative Queuing Technique to Optimize the Performance of TDMA Based Mobile Communication Systems

This paper analyses an alternative traffic queuing model for the quality of service (QoS) optimization in mobile communications systems. According to the proposed model, the queue of handover attempts is separated to each of the used transceivers of a base transceiver station that covers a particular area. Fixed channel assignment and TDMA are considered, while the proposed technique is compared to the classic queuing model. The comparison results show that the QoS of the proposed model is fully optimized, especially if large queue sizes are chosen.