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Introduction Overview What Is a Markup Language Rationale for XML Contrasts XML, SGML, HTML DTDs Schemas XML Does Not Replace SGML or HTML Key XML Technologies Corporate Support for XML Why Managers Are Interested in XML Some of the Risks of XML DTD Repositories and Standards Exploiting XML

35 X and Y are independent random variables with X = 35, Y = 27, X = 08, and Y = 065 What are X+Y and X+Y a b c d e

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Part 1:

To begin to understand the ANSI-41 signaling protocol, it is necessary to understand some basics about wireless telecommunications This chapter provides a general overview of the most important concepts in wireless cellular telecommunications that apply to ANSI-41 For some readers, this will be a high-level review; for others, it may clarify some misconceptions and provide an overall understanding of cellular wireless technology that will be useful in understanding ANSI-41

The concept of wireless telecommunications can be viewed from two perspectives: the wireless subscriber s and the wireless network s From the subscriber s perspective, wireless telecommunications is a service that allows telephone calls to be made or received while the telephone equipment moved from place to place or while it is in motion From this perspective, the telephone handset (known as the mobile station) is wireless and affords the ability to be mobile From the network s perspective, wireless telecommunications is a service provided to end-users Wireless telecommunications, within the context of ANSI-41, is a service based on a set of functions internal to the network known as mobility management Mobility management functions enable the network to maintain location and subscriber status information so that end-users can make and receive calls while they move from place to place

Wireless telecommunications can be considered both a system and a service The network equipment including antennas, radios, switches, databases, and all hardware and software within the network, represents a wireless telecommunications system that provides wireless telecommunications service to subscribers The first wireless telecommunications system based on cellular technology was (and is) known as AMPS (Advanced Mobile Phone System), a

1 2 4 4 5 6 7 7 10 13 13 14 15 16

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X+Y = 62, X+Y = 103 X+Y = 62, X+Y = 10625 X+Y = 31, X+Y = 0725 X+Y = 62, X+Y = 145 X+Y = 62, X+Y cannot be determined from the information given

1:

technology developed by Bell Laboratories in 1947 The term cellular refers to a network of small cells or radio transceivers, each providing a limited range of radio coverage, which are linked by a computer-controlled switching system that manages subscriber mobility and interfaces to the fixed wire-line telephone network The technology is based on cellular frequency reuse (described later), providing a high-capacity system and allowing network access using low-power mobile stations (typically less than 6 W) The radio transceiver modulation methods used are based on analog frequency modulation (FM) signals similar to those used for commercial radio, but at a higher frequency range and lower bandwidth The first commercial cellular system in the United States became operational in Chicago in 1983 However, other countries around the world provided operational cellular systems several years earlier Today, cellular systems based on AMPS technology are implemented in more than 100 countries It is interesting to note, however, that there is no single worldwide standard for the implementation of these cellular systems The different systems deployed generally represent differing radio technologies, each based on the concepts of AMPS The networking technologies used to link the cells together are also quite different These technologies are considered supplemental to the defining characteristics of AMPS (ie, cells, frequency reuse, etc) In fact, AMPS can operate within a variety of networking schemes