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Wiley.Mobile.Telecommunications.Protocols.For.Data.Networks
Mobile.Telecommunications.Protocols.For.Data.Networks |  | 收藏 | | | 作者 | Anna Ha´ | | ＩＳＢＮ | 0-470-85056-6 | | 出版日期/版本 | 2003 | | 格式 | ＰＤＦ Adobe Acrobat |
主题内容 | | Mobile telecommunications emerged as a technological marvel allowing for access to
personal and other services, devices, computation and communication, in any place and
at any time through effortless plug and play. This brilliant idea became possible as the
result of new technologies developed in the areas of computers and communications that
were made available and accessible to the user.
This book describes the recent advances in mobile telecommunications and their protocols.
Wireless technologies that expanded to a wide spectrum and short-range access
allow a large number of customers to use the frequency spectrum when they need it.
Devices are used to communicate with the expanded network. Software systems evolved
to include mobile agents that carry service information that is compact enough to be
implemented in the end user devices.
The area of mobile telecommunications has been growing rapidly as new technologies
emerge. Mobile users are demanding fast and efficient connections that support data
applications. Extending wireless access to the applications requires creating mobile agents,
systems, and platforms to implement service configuration. Wireless Local Area Networks
(LANs) supporting a growing number of users and applications require wideband wireless
local access, wireless protocols, and virtual LANs. Wireless applications require protocols
and architecture supporting these applications. Wireless connection has to be provided by
the networks and protocols. Mobile networks must function efficiently by using their
protocols, performing routing and handoff for mobile users.
This book focuses on the newest technology for mobile telecommunications supporting
data applications. The book provides a real application-oriented approach to solving
mobile communications and networking problems. The book addresses a broad range of
topics from mobile agents and wireless LANs to wireless application protocols, wireless
architecture, and mobile networks.
This book proposes a comprehensive design for mobile telecommunications including
mobile agents, access networks, application protocols, architecture, routing, and handoff.
For mobile users and data applications, these are new networking and communications
solutions, particularly for the LAN environment. The book describes the aspects of mobile
telecommunications for applications, networking, and transmission. Additionally, it introduces
and analyzes architecture and design issues in mobile communications and networks.
The book is organized into 12 chapters. The first seven chapters describe applications,
their protocols and mobile and wireless network support for them. Chapters 8 through
12 describe architecture of mobile and wireless networks, their protocols, and quality-ofservice
(QoS) issues.
The goal of this book is to explain how to support modern mobile telecommunications,
which evolve toward value-added, on-demand services, in which the need for communication
becomes frequent and ongoing, and the nature of the communication becomes more
complex. Mobile agents are used to enable on-demand provision of customized services.
Examples of mobile agent-based service implementation, middleware, and configuration
are introduced.
Mobile applications are supported by wireless LANs. Virtual LANs provide support
for workgroups that share the same servers and other resources over the network.
Orthogonal Frequency Division Multiplex (OFDM) allows individual channels to maintain
their orthogonality, or distance, to adjacent channels. This technique allows data
symbols to be reliably extracted and multiple subchannels to overlap in the frequency
domain for increased spectral efficiency. The IEEE 802.11 standards group chose OFDM
modulation for wireless LANs operating at bit rates up to 54Mb s−1 at 5 GHz.
Wideband Code Division Multiple Access (WCDMA) uses 5-MHz channels and supports
circuit and packet data access at 384 kb s−1 nominal data rates for macrocellular
wireless access. WCDMA provides simultaneous voice and data services. WCDMA is
the radio interface technology for Universal Mobile Telecommunications System (UMTS)
networks.
Mobile applications and wireless LANs use wireless protocols. A Media Access Control
(MAC) protocol for a wireless LAN provides two types of data-transfer Service Access
Points (SAP): network and native. The network SAP offers an access to legacy network
protocols [e.g., IP (Internet Protocol)]. The native SAP provides an extended service
interface that may be used by custom network protocols or user applications capable of
fully exploiting the protocol-specific QoS parameters within the service area.
Limitations of power, available spectrum, and mobility cause wireless data networks to
have less bandwidth and more latency than traditional networks, as well as less connection
stability than other network technologies, and less predictable availability.
Mobile devices have a unique set of features that must be exposed into the World
Wide Web (WWW) in order to enable the creation of advanced telephony services such
as location-based services, intelligent network functionality, including integration into the
voice network, and voice/data integration.
The Wireless Application Protocol (WAP) architecture provides a scalable and extensible
environment for application development for mobile communication devices. The
WAP protocol stack has a layered design, and each layer is accessible by the layers above
and by other services and applications. The WAP layered architecture enables other services
and applications to use the features of the WAP stack through a set of well-defined
interfaces. External applications can access the session, transaction, security, and transport
layers directly.
The network architecture supporting wireless applications includes Wireless Applications
Environment (WAE), Wireless Telephony Application (WTA), and WAP Push
framework. The WAE architecture is designed to support mobile terminals and network
applications using different languages and character sets.
WTA is an application framework for telephony services. The WTA user agent has the
capabilities for interfacing with mobile network services available to a mobile telephony
device, that is, setting up and receiving phone calls. |
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