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Service delivery in a heterogeneous wireless network environment requires the selection of an optimal access network. Indeed, the selection of a non-optimal network can result in undesirable effects such as higher costs in terms of new call blocking and handoff call dropping rates or poor service experience. Network selection in such an environment is influenced by several factors related to network...
To support battery powered mobile broadband wireless access devices efficiently, IEEE 802.16e defines a sleep mode operation for conserving the power of mobile terminals. In this paper, a linear hybrid algorithm is proposed based on the adjustment of sleep window under circumstances of low service traffic, aiming for reducing the response time and energy consumption of mobile subscribe station (MSS)...
Future wireless communication systems are expected to be comprised of multiple overlay networks, in which different kinds of Radio Access Technologies (RATs) are being deployed in overlay. Since efficient use of multiple RATs may result in economical benefits to users and network operators, RAT selection, or joint radio resource management, is an important issue. For the sake of proper RAT selection,...
As IEEE 802.11 matures and other wireless access technologies are introduced (such as IEEE 802.16e), the emergence of Internet Protocol as a de facto standard for transport allows users to have increasing choice about their mobile access. This effect will not only increase competition amongst cellular network providers it will also increase competition with other stakeholders and operators in the...
Content distribution from wired to wireless domain has traditionally being perceived as the problem of wireless last-hop extension. We argue that increasing the physical transmission capability at the last hop bottleneck alone will not be sufficient to cater for throughput demands and come up with a network architecture which can be tailored favorably for content distribution within mobile and wireless...
The present article provides a literature review in the field of open access networks and points out additional strengths of infrastructure sharing in the advent a new wave wireless advances. The first part of the article summarizes different initiatives carried out both by researchers and practitioners around the globe. The focus is on finding commonalities in what have been, until now, disperse...
The multihop cellular network with mobile relays is of great interest to the emerging standards like IEEE 802.16j, 3GPP-LTE in order to provide wireless broadband access with an increased throughput and coverage. In this context, we focus on the non-real-time services for the uplink direction of a conventional cellular system with multihop transmission using mobile relay stations (RS). Our goal is...
We are currently witnessing the coexistence of a multitude of radio access networks allowing the users to connect to the federative all-IP core network, and then further to the Internet. In this heterogeneous environment we should strive to be "best connected, anytime, anywhere". We have concentrating our research on distributing the handover mechanisms over multiple entities within networks...
Mobile relay stations (RSs) provide broadband wireless access (BWA) networks with additional mobility, which extends network coverage and advances dynamic networking and ubiquitous computing. However, there are many unresolved security vulnerabilities in the current IEEE 802.16 standard, such as BS/RS spoofing. Additional measures are needed to ensure that each component in the network is a trusted...
This paper surveys the issues in implementing a wired backhaul optical network that supports mobility of broadband wireless access network users. In particular, the focus is on the functionalities and the performance in terms of delay, throughput, and reliability that the backhaul network must guarantee.
A proliferation of mobile devices with several bundled network access technologies is taking place, which when combined with the wide deployment of more wireless networks, creates an unprecedented multiaccess environment. At the same time, though, communications become far more complex, if one wants to fully take advantage of the opportunities unveiled in this new setting. In recent years there has...
During the last years there has been a strong research effort on the autonomic communications and self-management paradigms. Following this impulse, the academic community and the industry have proposed several architectures and techniques to allow network devices to make their own configuration decisions. Those proposals often include resource-expensive technologies such as complex inference machines,...
IEEE 802.16 is defining standards for mobile multihop relay (MMR). The major purpose of MMR is to efficiently extend the coverage of a BS and to enhance the system throughput. Relay station (RS) has been introduced to fulfill this goal. However, packets in MMR would have a large probability of failure transmission because not all links over the multihop path are in good channel condition. Therefore,...
The accurateness of round-trip- and one way delay measurements for 2G and 3G networks rely to a much larger extent on employing a sound methodological framework than this is the case for other types of networks. Typical mobile access networks differ significantly from core networks, most prominently with respect to delay. In this paper we present payload-dependent delay measurement results for public...
With the evolution and penetration of the IP-based core network and the mobile access networks, more and more legacy services are being transferred to the converged and unified IP-based platform. For realizing this transfer, SIP (Session Initiation Protocol) has been adopted by standards bodies for creating, modifying, and terminating multimedia sessions. SIP with application-level mobility support...
One of the key features of emerging and future wireless systems is the continuous increase in the number and diversity of available radio access technologies. A great number of research efforts in the past decade have focused on ways to more efficiently exploit the various wireless access technologies. Among the recent trends in this direction are cognitive wireless networks and systems, targeting...
This paper presents delay and throughput performance results for a "cache-and-forward" (CNF) network architecture for mobile content delivery services. The CNF network uses hop-by-hop transport and in-network storage to deliver large media files to mobile users. The CNF protocol is designed to deal with fluctuating wireless link quality and occasional periods of disconnection, and is therefore...
Our study demonstrated that caching scheme performs better in high density mobile networks than in sporadic circumstance. Based on the analysis of correlation between cache performance and the zipf-like user behaviors, we proposed some possible methods to improve cache performance in high density mobile networks.
In this study, feasibilities of HTTP specific acceleration and TCP optimization in mobile network are analyzed through comparisons. Based on these analyses, practicable accelerator architectures for Web latency reduction are presented. Furthermore, we proposed that a boost in performance is feasible by either deploying cooperative proxies with concurrent connection or combining the characteristics...
Mobility has become a mandatory feature of the future Internet as mobile computing gains increasing popularity among Internet users. The rapidly evolving heterogeneous wireless environment provides a variety of communication resources for the mobile host. In order to fully benefit of these wireless access networks an efficient and quality oriented mobility management system has to be employed. This...
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