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One of major objectives of the 4G wireless network architecture is to facilitate seamless mobility of users between heterogeneous networks while satisfying QoS requirements. The moment at which a user should switch from the current network to another where better resources can be provided is still a hot research topic. This work studies a new criterion for triggering the vertical handoff process....
The integration of heterogeneous wireless networks has been studied for some time. Wireless networks can be complementary by providing additional resources to one another if properly integrated. For example, 3G networks offer increased coverage, but they have a low capacity for data transmission. In contrast, WLANs (Wireless Local Networks) offer a limited coverage range while allowing high rates...
Next Generation Wireless Networks (NGWNs) will be the convergence of fixed and mobile networking technologies, e.g., Ethernet, Wireless LAN, 2G/3G/4G, etc. This united ubiquitous network will consist of billions of mobile devices, each with multiple networking interfaces. These interfaces may belong to a set of diverse link layer technologies. Internet Protocol (IP) shall potentially be used as the...
The performance of signaling protocols in circuit and packet switching networks is a significant parameter to evaluate the performance of any telecom operator. Today, users demand continuous high data rate, service availability, network reliability, mobility, QoS and minimum service initialization time. IP Multimedia Subsystem (IMS) standardized Session Initiation Protocol (SIP), which categorize...
Over the last two decades, wireless communications has witnessed an explosive growth and without any doubt has revolutionized many aspects of our daily lives. In this short time period, wireless networks have advanced through three generations (1G, 2G, and 3G), and many licensed or license-free wireless technologies such as WiMAX and WiFi have also emerged to complement the capabilities of cellular...
This paper deals with how the availability of wireless/cellular access networks depend on the cooperation between the operators as well as with transmission network operators and professional land lords. The forthcoming 4G network will consist of diverse sets of wireless/cellular networks integrated into IP-based networks. Mobility, QoS and seamless handover between the networks are key features....
As the telecommunications industry evolves towards a converged IP-Core network the role of cellular/wireless broadband technologies in achieving Long Term Evolution (LTE) must be greatly evaluated. This would in effect provide lessons for improvement and blueprints for final adoption in NGN (Next Generation Networks). The emergence of BWA (broadband wireless access) as a reliable player, in some cases...
An important challenge in cellular IP networks, which deals with the micro mobility, is providing good quality of service (QoS) to the users especially to the real-time users that are involved in the exchange of real-time packets. Bandwidth reservation for real-time traffic to maximize the connection completion probability (CCP) is an important activity. Genetic algorithm (GA), which is a useful tool...
With the growing popularity of digital home, digital multimedia applications are in rapid development. Digital media adapter (DMA) in home network is very popular in recent years. However, some problems come out while applying the standard A/V application framework for DMA software, for examples, device's overloaded tasks, and low device's applicability of the DMA software, etc. Addressing these issues,...
End-to-end quality of service in today's mobile networks is essential to end users since most of the services are non-real-time data services (primarily based on IP) which have time-varying quality over time, end-user position and other-end location. It is possible to have different quality for the same service under same mobile network conditions in the core and wireless part. Therefore, mobile operators...
Femtocells use common cellular air access technologies, but claim to improve system capacity according to Shannon's law by reducing distance between transmitter and receiver and thus improving the signal-to-noise ratio (SNR). Femtocells, however, use the IP network as backhaul architecture instead of the conventional cellular network infrastructure. Thus, femtocell and WiFi infrastructure networks...
GPRS, EDGE, 3G and HSDPA are wireless data services that are deployed by Mobile operators to provide higher data rate. This paper provides a set of measurements that are used to evaluate, from user perspective, these types of data services in the State of Kuwait. The Measurements are taken in different areas of Kuwait. Measurements show that HSDPA is the best wireless data connection offered by the...
During the last several years, the Internet has evolved from a wired infrastructure to a hybrid of wired and wireless domains by spreading worldwide interoperability for microwave access (WiMAX), Wi-Fi, and cellular networks. Therefore, there is a growing need to facilitate reliable content delivery over such heterogeneous networks. On the other hand, application layer multicast (ALM) has become a...
The success of next generation wireless networks will rely much on advanced mechanisms for seamless mobility support among emerging heterogeneous technologies. Currently, mobile IP is the most promising solution for mobility management in the Internet. Several IP micro mobility approaches have been proposed to enhance the performance of mobile IP which supports quality of service, minimum packet loss,...
In recent years, the study of new network architectures has defined a clear trend towards using IP end-to-end. One of the most important issues for these types of all-IP networks is how to provide quality of service guarantees while a user is moving in wireless networks. The quality of service may degrade due to insufficient resources in the air links of any of the calling parties. In 3G cellular...
The main idea of the third generation (3G) networks is to merge two of the most important communication systems: cellular networks and Internet. The IP multimedia subsystem (IMS) defined by 3GPP is a technology designed to provide robust multimedia services across roaming boundaries and over diverse access technologies. In this communication converged world, the challenging issues are security and...
The next generation of mobile phones will be probably all-IP based enabling users to access Internet services. In order to make this possible a satisfactory quality of service, at least equal to the fixed Internet, must be ensured. To achieve this goal an end-to-end QoS system must be constructed. Another fact is the dominance of IP over other technologies due, in large measure, to its characteristic...
The next generation 4G wireless networks is envisioned as a convergence of different wireless access technologies providing the user with the best anywhere, anytime connection and improving the system resource utilization. The integration of wireless local area network (WLAN) hot spots and cellular networks (such as GPRS and UMTS) needs a more efficient handoff process. Handoff process between WLAN...
A novel autonomic area reconfiguration mechanism is proposed that complements hierarchical QoSR protocols in wireless access networks. The proposed mechanism revises the border between adjacent areas based on handover rates and on resource consumption in terms of bandwidth and user population. Its objectives are concentrated on reducing the overhead related with frequent inter-area handovers as well...
IP multimedia subsystem was introduced by the third generation partnership project (3GPP) to enable 3G mobile systems to provide ubiquitous cellular access to all the services that the Internet provides, with improved quality of service, appropriate charging and integration of services. For users to access the IMS services, IMS capable User Equipments are required. In this paper we present an IMS...
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