1,966 research outputs found
Comparative Analysis of Location Management Schemes in Wireless ATM Networks
Mobility is the cornerstone of wireless networks. Supporting mobility
requires some form of tracking to locate mobile terminals within the network. In
the wireline ATM network, the terminal is fixed and the terminal is located by
identifying the terminal and following the routing information provided at each
switch along the path. As terminals become mobile, the path to the mobile becomes
dynamic; the terminal and the path are no longer synonymous. Signalling traffic
incurred in tracking mobile users and delivering enhanced services causes an
additional load in the Wireless ATM (WArM) network. Efficient database and
location management schemes are needed to meet the challenges from high density
and mobility of users, and various service scenarios.
In this thesis the three "natural" Location Management Strategies, i.e.,
Timer-Based, Location Area Based and Movement Based are studied and analysed
for a W ATM network. The model used for depicting user motion and call arrival is
Brownian motion with drift process and Poisson arrival process, respectively. The Timer-Based location management strategy is one in which the user
updates its location periodically after an "optimum" interval of time. This optimum
interval of time is based upon the user's mobility and call arrival characteristics and
is therefore best suited for that particular mobile.
In the Adaptive Location Area Based strategy, the user updates its location
on each LA boundary crossing. The size of the LA changes according to the user' s
mobility characteristics. The objective is to minimise the combined average
signalling cost of both paging and registration for each individual mobile user such
that the overall system-wide signalling cost for location tracking can be minimised
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Signalling Storms in 3G Mobile Networks
We review the characteristics of signalling storms that have been caused by
certain common apps and recently observed in cellular networks, leading to
system outages. We then develop a mathematical model of a mobile user's
signalling behaviour which focuses on the potential of causing such storms, and
represent it by a large Markov chain. The analysis of this model allows us to
determine the key parameters of mobile user device behaviour that can lead to
signalling storms. We then identify the parameter values that will lead to
worst case load for the network itself in the presence of such storms. This
leads to explicit results regarding the manner in which individual mobile
behaviour can cause overload conditions on the network and its signalling
servers, and provides insight into how this may be avoided.Comment: IEEE ICC 2014 - Communications and Information Systems Security
Symposiu
Minimization of Handoff Failure Probability for Next-Generation Wireless Systems
During the past few years, advances in mobile communication theory have
enabled the development and deployment of different wireless technologies,
complementary to each other. Hence, their integration can realize a unified
wireless system that has the best features of the individual networks.
Next-Generation Wireless Systems (NGWS) integrate different wireless systems,
each of which is optimized for some specific services and coverage area to
provide ubiquitous communications to the mobile users. In this paper, we
propose to enhance the handoff performance of mobile IP in wireless IP networks
by reducing the false handoff probability in the NGWS handoff management
protocol. Based on the information of false handoff probability, we analyze its
effect on mobile speed and handoff signaling delay.Comment: 16 Page
Location Management in IP-based Future LEO Satellite Networks: A Review
Future integrated terrestrial, aerial, and space networks will involve
thousands of Low Earth Orbit (LEO) satellites forming a network of
mega-constellations, which will play a significant role in providing
communication and Internet services everywhere, at any time, and for
everything. Due to its very large scale and highly dynamic nature, future LEO
satellite networks (SatNets) management is a very complicated and crucial
process, especially the mobility management aspect and its two components
location management and handover management. In this article, we present a
comprehensive and critical review of the state-of-the-art research in LEO
SatNets location management. First, we give an overview of the Internet
Engineering Task Force (IETF) mobility management standards (e.g., Mobile IPv6
and Proxy Mobile IPv6) and discuss their location management techniques
limitations in the environment of future LEO SatNets. We highlight future LEO
SatNets mobility characteristics and their challenging features and describe
two unprecedented future location management scenarios. A taxonomy of the
available location management solutions for LEO SatNets is presented, where the
solutions are classified into three approaches. The "Issues to consider"
section draws attention to critical points related to each of the reviewed
approaches that should be considered in future LEO SatNets location management.
To identify the gaps, the current state of LEO SatNets location management is
summarized. Noteworthy future research directions are recommended. This article
is providing a road map for researchers and industry to shape the future of LEO
SatNets location management.Comment: Submitted to the Proceedings of the IEE
A Robust Analysis of Dual-Band Wireless LAN (4G-WLAN) for Effective Internet Access: A Review Paper
This paper presents the findings of a comprehensive study of dual-band WLAN for internet access. It gives an exposition of the architecture of the 4G-WLAN routers which is a more advanced and the latest technology that uses Adaptive Modulation and Coding (AMC) to dynamically react to channel fluctuations while maintaining bit-error rate targets of the transmission. It also x-rays the part played by the internet service providers (ISP), the access providers (i.e. Dial-up, DSL, Satellite and fibre optics) which are responsible for high data throughput and cost of connection. This paper also discusses the IP addressing methods of the connected devices (i.e. BOOTP and DHCP) which depict the Transmission Control Protocol/Internet Protocol (TCP/IP) of the network. The system clearly provides added convenience of Internet access and the extent of mobility the wireless routers can bring to computer networks and users. This technology provides a platform for future expansion. Keywords— Dual-Band WLAN, 4G-WLAN Router, AMC, Internet access provider, Data throughput, TCP/IP, Access provide
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