The increasing demand for broadband access leads operators to upgrade the existing access infrastructures (or building new access network). Broadband access networks require higher investments (especially passive infrastructures such as trenches/ducts and base station towers/masts), and before making any decision it is important to analyze all solutions. The selection of the best solution requi...

In heterogeneous radio access networks mobile terminals can dynamically change their radio access not only between access points but also between different radio access technologies (RATs). We present a network based Multi-Radio Management (MRM) for seamless control of inter-RAT mobility. Access Selection can be triggered by a change of radio channel quality, by the start of an application or b...

In this article, we provide an overview of cryptography and cryptographic key management as they are specified in IPsec, a popular suite of standards for providing communications security and network access control for Internet communications. We focus on the latest generation of the IPsec standards, recently published as Request for Comments 4301–4309 by the Internet Engineering Task Force, an...

We study the characteristics of Internet1 and Internet2 traffic at a network access point at a major US university. With the use of fluid-flow modeling, we show that Internet1 and Internet2 traffic have different queuing behaviors and that a small percentage of traffic on both networks largely contributes to this overall queuing behavior. We also demonstrate that buffer sizing, as a method to r...

In the context of wireless user’s increasing demands for better device power and battery management, this paper investigates some factors that can impact the power consumption on the energy consumption of mobile devices. The focus is on two factors when performing multimedia streaming: the impact of the traffic location within a WLAN; and the impact of the radio access network technology (WLAN,...

There are some common network control issues in IP over WDM(IP/ WDM) which includes network addressing, neighborhood discovery, routing behavior, connection setup and tear down, signaling mechanism, network access control and IP/ WDM protection and restoration. Among them network addressing and restoration are two major research area. In this paper these two issues have been discussed. This pap...

Currently there are no Internet access authentication protocols available that are lightweight, can be carried over arbitrary access networks, and are flexible enough to be re-used in all the likely future ubiquitous mobility access contexts. This article proposes the PANA/UMTS authentication protocol for heterogeneous network access as a step towards filling this gap. A security analysis of th...

Recently, sharing the radio access network (RAN) has become an important issue for 3G and beyond mobile wireless operators. In addition to user and service considerations, there are economic and technical advantages to 3G and beyond shared networks. This is driving optimizations in the deployment and development of national 3G and 4G rollouts. However, shared 3G and 4G networks exhibit many of ...

The integration of WLANs and 3G networks has recently attracted much attention. To support seamless service between 3G and WLAN networks, low latency access control mechanisms of the two networks are highly required. This work presents a novel access control mechanism, which aims to support seamless services for an integrated 3G-WLAN network. The proposed method, based on a loose coupling archi...