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Recent advances in mobile and wireless communication and personal computer technology have created a new paradigm for information processing. Today, mobile and wireless communications exit in many forms, providing different types of services. Existing forms of mobile and wireless communications continue to experience rapid growth and new applications and approaches are being spawned at an increasing rate. Recently, the mobile and wireless Internet has become one of the most important issues in the telecommunications arena. The development of the mobile and wireless Internet is the evolution of several different technologies coming together to make the Internet more accessible. Technologies such as the Internet, wireless networks, and mobile computing have merged to form the mobile and wireless Internet. The mobile and wireless Internet extends traditional Internet and World Wide Web services to wireless devices such as cellular phones, Personal Digital Assistants (PDAs) and notebooks. Mobile and wireless Internet c:an give users access to personalized information anytime and anywhere they need it, and thus empower them to make decisions more quickly, and bring them closer to friends, family, and work colleagues. Wireless data communication methods have been around for sometime.

Inhaltsverzeichnis

Frontmatter

Chapter 1. Dynamic Configuration of Mobile Devices for Wireless Internet Access

Abstract
The dynamic configuration of devices plays a pivotal role in supporting plug-and-play operation in IP networks. For devices that are not mobile, dynamic configuration is typically supported by the widespread Dynamic Host Configuration Protocol (DHCP) [5], which replaces burdensome manual configuration procedures and enables the address space to be managed efficiently. The configuration state allocated to devices by DHCP includes the device’s IP address and a series of DHCP options [7] such as routing parameters (e.g., a subnet mask and default gateway), identity information (e.g., the device’s domain name) or service related parameters (e.g., server addresses for DNS, IMAP, HTTP proxy, NTP, etc.). However, since DHCP was designed to serve the configuration needs of trusted clients in a local LAN, it does not support the configuration of devices connected to a remote network, a situation that arises when the devices are mobile.
Sandra Thuel, Luca Salgarelli, Ramachandran Ramjee, Thomas La Porta

Chapter 2. Fast Soft Handoff Support and Diffserv Resource Allocation in Wireless Mobile Internet

Abstract
Provision of various real-time multimedia services to mobile users is the main objective of the next-generation wireless networks, which will implement Internet Protocol (IP) in the network layer and can interwork with the Internet backbone seamlessly [9, 28]. On the radio interface, the wideband code-division multiple access (CDMA) techniques are used, aiming to provide mobile users a reliable, high-speed, wireless Internet connection. The establishment of such wireless mobile Internet is technically very challenging. Two major tasks are the support of fast soft handoff and the provision of quality-of-service (QoS) guarantee over IP-based wireless access networks.
Cheng Yu, Liu Xin, Zhuang Weihua

Chapter 3. Wireless Access of Internet Using TCP/IP

A Survey of Issues and Recommendations
Abstract
The Internet has many different kinds of applications (e.g., audio, email, chat). The applications interact with a few transport protocols like TCP, UDP and RTP. There is only one widely-deployed network protocol, the Internet Protocol (IP). The IP protocol facilitates routing and subnetwork specific details from the transport protocols. While this allows transport protocols to run over many different kinds of subnet (e.g., Ethernet, wireless network, FDDI), they are not optimized for any specific subnetwork.
Sridhar Komandur, Spencer Dawkins, Jogen Pathak

Chapter 4. Mobility Prediction for QoS Provisioning

Abstract
In recent years, there has been a rapid increase in cellular network deployment and mobile device market penetration. With vigorous research that promises higher data rates, future wireless networks will likely become an integral part of the global communication infrastructure. Ultimately, wireless users will demand the same reliable service as of today’s wireline telecommunications and data networks. However, there are some unique problems in cellular networks that challenge their service reliability. In addition to problems introduced by fading, user mobility place stringent requirements on network resources. Whenever an active mobile terminal (MT) moves from one cell to another, the call needs to be handed off to the new base station (BS), and network resources must be reallocated. Resource demands could fluctuate abruptly due to the movement of high data rate users. Quality of Service (QoS) degradation or even forced termination may occur when there are insufficient resources to accommodate these handoffs.
Hyong S. Kim, Wee-Seng Soh

Chapter 5. Seamless Mobility

Abstract
Maintaining IP service to a mobile host in the Internet is largely a matter of negotiating boundaries. As a host moves, it crosses various natural boundaries in the Internet. When the host is inside one of these boundaries, both the host and the network contain state associated with maintaining the host’s IP service. The state is in certain cases specific for the network within the boundary. Some aspects of this state change when the mobile host moves across a boundary, so that the old state is either no longer valid or no longer accessible. As a consequence of that primary change, secondary effects may occur.
James Kempf

Chapter 6. IP Mobility Protocols for Wireless Internet

Abstract
Research in mobile communications has gained a lot of importance since the rapid growth of wireless networks and portable devices. The proliferation of Internet in every aspect of life has urged the service providers to provide seamless user mobility. While the Second-Generation (2G) wireless system has brought mobile telephony, the Third-Generation (3G) is expected to bring in high-speed data and multimedia communication to the mobile users. 3G not only promises much higher data rate than 2G technology, but also opens up the avenue of providing a rich set of applications like location-based services, multimedia messaging services and customized information. However, the evolution of 3G from 2G requires the change of core network from circuit to packet switching mode and building a core network that is independent of access technology. The Internet Protocol (IP) [1] has been the natural choice as a packet-switched protocol because of the increasing dominance. Another important reason for adoption of IP is because it is a network layer protocol that can be used with any kind of access network technology.
Sajal K. Das, Nilanjan Banerjee, Wu Wei, Smitha Ganeshan, Jogen Pathak

Chapter 7. An Initial Security Analysis of the Personal Transaction Protocol

Abstract
Our society is becoming increasingly dependent on the rapid access and processing of information. The number of handheld mobile devices with access to the Internet and network-based software and services is exploding. Research indicates [1] that by the end of 2002 there will be over 1 billion mobile phone owners globally with Internet access, and that this number is going to grow exponentially in the nearest future. By 2006 the number of interconnected mobile device users is expected exceed the worldwide Internet subscriber population. It is estimated that in a few years there will be three times as many of these devices worldwide as personal computers.
Jari Veijalainen, Alexandr Seleznyov, Oleksiy Mazhelis

Chapter 8. Node-Centric Hybrid Routing for Wireless Internetworking

Abstract
Multihop packet radio networks (or ad-hoc networks) consist of wireless routers that interconnect attached hosts without the need of any pre-established communication infrastructure. These networks play an important role in relief scenarios, battlefields and conference scenarios, where there is no base infrastructure.
J. J. Garcia-Luna-Aceves, Soumya Roy

Chapter 9. Mobile Multicast

Abstract
During the late-1990s, the popularity of Internet applications like B2C (business-to-consumer) e-commerce and web-browsing led traditional network operators to seek ways which allowed their customers to access these new services. Today (2002), IP-based packet switching technology has finally matured enough to replace the circuit-switched backbones of telecommunication carriers. Convergence on the IP protocol is now happening and it will continue to happen throughout this decade. It is obvious that this one common protocol will ease the management of all wired and wireless data networks. IP will also fuel the deployment of novel applications. An important feature these applications will expect from an all-IP internetwork is full support for multipoint communications. Multipoint, or group, communications are best described by the term multicast, a term associated with network support for efficient data delivery to more than one interested recipients. Multicast’s objective is to place the least amount of burden on network and end-host resources. Applications that could exploit this feature include conferencing, on-line games, software distribution, and others. Although multicast can be emulated by letting the data sources themselves send packet copies to all intended destinations, this “multi-unicast” solution offers no scalability as resources on both the source host and its local network would eventually be depleted.
Elias C. Efstathiou, George C. Polyzos

Chapter 10. Multipath Routing in Ad Hoc Networks

Abstract
In an ideal network, a source always knows how to reach the destination, and the network connection is always reliable. In an ad hoc wireless network where any node can be mobile, a source needs to update the location of the mobile destination and intermediate nodes constantly, and network connections may break frequently due to the changing network topologies and unreliable wireless connectivity.
An-I Andy Wang, Geoffrey H. Kuenning, Peter Reiher

Chapter 11. Competitive Analysis of Handoff Rerouting Algorithms

Abstract
Personal Communication Systems (PCS) enable people and devices to communicate independently of their location and while moving from place to place. For providing continuous communication to mobile users every PCS network employs a mobility management composed of two components, location management and handoff management In contrast to the telephone number in traditional telecommunication systems that specifies the location of the end user, the PCS subscriber number does not provide the location of the mobile user. Therefore, the system must maintain a location management mechanism for locating mobile users. This mechanism maps subscriber numbers to the current location of the requested users for call delivery operations. The handoff management enables the PCS network to maintain sessions with mobile users while they change their attach pints with the system’s infrastructure. Such changes are called handoff or handover operations [8,30]. In this chapter we consider only rerouting algorithms for supporting handoff oprations can be found in [6,30,33]. In our discussion we consider only intercell handoff operations that result from user movements to new cells1 that include actions at both the wireless level and the network infrastructure.
Yigal Bejerano, Israel Cidon, Joseph Seffi Naor

Chapter 12. Cache-Based Compaction

A Technique for Optimizing Wireless Data Transfer
Abstract
Despite the emergence of wide-area wireless data services, the bandwidth available over a wide-area wireless channel is still fairly limited and likely to remain so in the forseeable future due to the inherent limitation of wireless transmission in a limited spectrum. In the United States, new third generation technology such as the 3G1X offering speed up to 144Kbps is already being deployed and emerging high-speed wireless data standard such as the High Data Rate (HDR)[Bender et al., 2000] can eventually provide rates up to 2Mbps. However, since the bandwidth available over a wireless network are shared by a number of mobile users, the average bandwidth available to each user is usually much smaller.
Mun Choon Chan, Thomas Y. C. Woo

Chapter 13. Performance Improvements in Multi-Tier Cellular Networks

Abstract
The goal of a Personal Communication System (PCS) is to provide a wide range of services, to multiple user types, at any location, and over multiple environments. Future cellular networks will be a central part of this goal and will therefore require improved quality of service (QoS), higher capacity, and a larger coverage area than existing networks. QoS can be improved if the system can achieve a lower new-call blocking probability and ensure that calls which are admitted into the system have lower failure rate (i.e., lower dropping probability). In order to increase the cellular network’s capacity, we can employ a finer mesh of smaller cells (i.e., microcells) over areas with a large population of users in order to achieve higher channel reuse. On the other hand, to be able to cover a larger area and serve a large number of highly-mobile hosts, we should increase the cell size.
Vijoy Pandey, Dipak Ghosal, Biswanath Mukherjee

Chapter 14. Technology-Independent Link Sensing in Wireless Ad-Hoc Networks: Benefits and Challenges

Abstract
Wireless-connected computing and communication devices such as cell phones, pagers, hand-held PCs, and the latest “integrated” devices that incorporate a PC or PDA and a cell phone into one package are becoming increasingly more popular. Some of these devices have several network interface options, such as Bluetooth
Bluetooth is a short-range («10m range) wireless network technology primarily designed to replace short-distance cable connections. See http://​www.​bluetooth.​com for more information.
The IEEE 802.11 standard was ratified in 1997 and specifies physical layer and medium- access layer behavior for wireless Local Area Networks. The 802.11HR standard is an amendment to the 802.11 standard to include higher data rates [13].
2.5G cellular networks are upgrades to the GSM cellular standard to provide higher data ransfer rates. See http://​www.​gsmworld.​com/​technology/​gprs/​index.​shtml for more information. The 3G or Third Generation wireless standards are part of the IMT-2000 standard of the International Telecommunications Union. Devices conforming to this standard will support data rates up to 2Mbps and are expected to be available in the US as early as 2003. See http://​www.​imt-2000.​org/​portal/​index.​asp for more information.
(GSM or GPRS-enabled) cellular service. As the devices become more sophisticated, it will be possible to automatically switch among the network interfaces, even within the same communication. For a device with multiple nerwork interfaces, it would be useful to have a single method of determining thi link status for each of those interfaces. With this ability, a user or an operating system could then choose the best available interface to use for communication. It would also be useful to have a means of predicting link failures before the link actually fails. Then the device would have ability to handoff transmission among the interfaces without disruption of the ongoing communication. In th event thore is only a single interface with a useable link, means of predicting that link’s failure would allow the operating sustem or user to take some other appropriate action, such as sending an “about to be disconnected” message to the distand end, or adjusting position to obtain a better link quality.
Lisa A. Shay, Kenneth S. Vastola

Backmatter

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