QoS is essential, but for mobile environment, it is difficult to achieve QOS when compared to wired network due to poor communication environment and mobility problems. In this document we explore the prominent efforts done in literature to provide schemes to do QoS in Wireless. We especially concentrate on resource reservation schemes. This document addresses cellular network QoS (mobile user ...

both the broadcast and the pointer based schemes for Prole I over a wide range of call/mobility ratios. The pointer based scheme performs better than the list based scheme only for a high call/mobility ratio in Prole II. Pointer based scheme incurs a penalty for informing the base stations of the new address for each move. The lower the mobility, the lower the cost of pointers. Thus under high ...

This paper studies the effects of cell residence times on wireless private branch exchange (WPBX) systems. In a WPBX, several base stations are connected to a PBX, and the PBX is connected to the Public Switched Telephone Network. It is important to determine the external line capacity and the radio channel capacities of a WPBX to optimize its system performance. Our previous study utilized an ...

IP multicast allows the efficient support of group communication services. The increase in the use of multicast has also triggered the need for supporting IP multicast in mobile environments. It is necessary to consider current unicast mobility management solutions in IP-based networks to smoothly extend multicast services to mobile users. Proxy Mobile IPv6 is a network-based mobility managemen...

Code mobility greatly improves the flexibility of the architecture of a distributed application. However, currently available platforms do not exploit fully the potential of mobile code. For instance, remote dynamic linking of code is often restrained to a well-known site, and applications are prevented from manipulating their own code base. In this paper, we use the notion of transiently share...

In a cellular network, a Mobile Host (MH) is said to be partitioned if it gets out of transmission range of the Base Station (BS) backbone netw ork.Rapid and eÆcient reco veryfrom MH partitioning is desirable, especially in Rapidly Deployable Netw orks (RDNs) in which BS mobility aggravates the partitioning problem. RDNs consist of Mobile Base Stations (MBSs) connected by high bandwidth wireles...

A rapid growth of IP-based networks and services created the vast collection of resources and functionality available to users by means of an uniform method of access – an IP protocol. At the same time, advances in design of mobile electronic devices allowed them to reach utility level comparable to stationary, desktop computers, while still retaining their mobility advantage. Unfortunately, th...

Mobile IP is a network layer solution to the wide-area mobility problem in the Internet. Mobility agents’ hierarchies and regional registrations have been introduced in the foreign domain as a local-area mobility support solution. In this paper, we critique the current regional registration proposal identifying some drawbacks with its registration mechanisms signaling design. In addition, we in...

Here we describe the design, assembly and characterisation of different structurally stable and highly polyvalent DNA catenanes. We synthesized a series of different catenated DNA nanostructures, among them symmetric ones containing two 126 or 168 base-pair rings, non-symmetric ones with a 126 and a 168 base-pair ring, and a [3]catenane containing three 126 base-pair rings. Reversible and quant...

In this paper, we have done a comparative study for a set of protocols supporting IP mobility, such as Mobile IP (MIP), Hierarchical Mobile IP (HMIP), Wireless IP, Cellular IP, HAWAII, TeleMIP and Dynamic Mobility Agent (DMA). These IP-based mobility protocols will play an important role in the convergence of IP and legacy wireless networks, within the context of the future 4G networks. TeleMIP...