WiMAX is a wireless broadband access technology which provides high data rates, long coverage and IP based connectivity to the stationary as well as mobile users. Voice over Internet Protocol (VoIP) through WiMAX is found to be very promising. In this paper, simulative investigations have been done to identify the suitable voice codec for the same. In doing so, silence suppressed voice signal a...

The vertical handover decision strategy in the heterogeneous wireless networks is very challenging issue because it needs to deal with many different radio access networks and make decisions for vertical handover calls between them. Due to traffic offloading the decisions for vertical handovers to WLAN hotspots in heterogeneous wireless networks are very important because they impact the QoS of...

A Mobile Station (MS)-controlled fast and simple scheme of handover (HO) in Mobile WiMAX network has been described. An MS can roughly estimate its present distance from any neighbouring Base Stations (BS) using the Received Signal Strength (RSS) and an appropriate pathloss formula. From the Mobile Neighbor Advertisement (MOB_NBR-ADV) broadcasts, the MS periodically monitors the RSS of its Serv...

The future airport surface communication system, called AeroMACS, shall be based on the IEEE 802.16 standard, in particular on the "WiMAX Mobile System Profile Specification". In the course of the SANDRA project the IEEE standard and the WIMAX mobile profile have been investigated and different configuration options have been evaluated. This paper presents an overview of options related to data...

Public safety agencies traditionally use mobile radio systems for communications although cell phones for voice and data are also now widely used. Most law enforcement officials would agree that these communications systems are not sufficient to meet the needs of law enforcement. Consequently there is significant interest in broadband wireless technology. In the research presented in this paper...

The knowledge on handover behaviour in WiMAX network is essential for network management and planning in order to achieve optimum system throughput. In this paper we have analysed the handover behaviour of transparent relay in several configurations for the IEEE 802.16j Mobile Multihop Relay (MMR) WiMAX network. The simulation was performed using NCTUns tool and adopted the hard handover mechan...

Recently, the IEEE 802.16 standard (IEEE Std 802.16-2004, 2004), a solution to broadband wireless access commonly known as Worldwide Interoperability for Microwave Access (WiMAX), has been considered as a promising standard for next generation broadband wireless access networks. IEEE 802.16e (IEEE Std 802.16e-2005, 2005), also called Mobile WiMAX (Li et al., 2007), provides enhancements to IEEE...

Next generation 4G technologies such as LTE and WiMAX promise to deliver an entirely new range of mobile broadband services. The dramatic growth in data rates, driven by open standard smartphones running data hungry applications, will drive a significant increase in mobile backhaul requirements. Microwave radios have long been the global technology of choice for backhaul infrastructure. Millime...

The admission control in 4G and 5G heterogeneous mobile and wireless networks will be more complex because it will need to deal with many different networks and decide to admit not only new calls and horizontal handovers, but also vertical handover calls. In this paper we propose a mobile sensitive algorithm for admission control in heterogeneous networks for seamless vertical handovers between...

Digital mobile broadcasting has received lots of attention recently. Due to broadcasting nature, packet loss is inevitable and the packet recovery issue needs to be addressed. The paper studies an integrated DVB-H and WiMAX mobile broadcasting architecture. DVB-H continually broadcasts videos to mobile devices. WiMAX serves as a recovery channel for mobile devices to request for retransmissions...