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The concept and implementation of QoS is getting support from high-speed standards in all networking areas, from xed wireline, mobile wireline, xed wireless and mobile wireless standards The access networks (usually QoS bottlenecks) are faster than ever, the evolution of IP switching into generalized MPLS has made bandwidth guarantees possible on IP links, wavelength division multiplexing (WDM) is promising ever higher bandwidth backbone connections, and the backbone traf c is far from the point where congestion could pose serious situations Consequently, we don t really need complex definitions of QoS In fact, the 3G cellular systems provide only four categories of user QoS; all application types are expected to get service under one of these four In this chapter and the next, we look at the selective cellular systems technologies for packet-switched data.

Morse, Bell was not originally a scientist or engineer, and was by trade a teacher of the deaf This, however, gave him a deep understanding of voice and hearing, which was surely an advantage in his work with the telephone As with the telegraph, the initial commercial development of the telephone took place within private nance and industry In a pattern that would repeat with later communication innovations, there were major battles around 1880 among patent holders, which ended for whatever reason with Bell victorious, and this is in part why we today connect the telephone with Bell5 There were, however, many other contributors One that should be mentioned, who narrowly lost out in the patent battles, is Elisha Gray Also, one must mention those who made pioneering contribution to the business organization, especially A Vail and G G Hubbard.

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As markets change, you need to be flexible to change with them. Sometimes, a change in the market necessitates a change in the policy. I decided to accept tenants who showed some risk.

In North America, the telephone underwent a rapid development during the period 1880 1900, with the chief service being short, telegraph-like voice messages between businesses It was relatively cheap and easy to install wires and an apparatus consisting of simply a coil for the earphone and a button lled with carbon for the microphone Connections were made by boys who ran around a room connecting ends of wires With these boys appeared for the rst time the concept of switching in a network As the telegraph had been before, the telephone was viewed initially as a point-to-point communication system, that is, one that permanently connected two users at opposite ends of a wire Bell was the prophet of a new switching view (Box 1-2).

We will start the chapter with a short account on enterprise wireless data networks, and then get right to the heart of one of the two prevailing 3G systems, cdma2000 We will divide the 3G discussion into air interface and core networks The discussion on their evolution may partially cover part of the earlier generations It is not our intent to discuss before 3G (be3g) technologies Also, we focus on packet switching only In the discussion on cdma2000, we will look at the PHY and MAC for the revision D of cdma2000 as speci ed in 3GPP2, followed by the all-IP network architecture model Before cdma2000, we will brie y mention the ve air interfaces originally considered by the ITU, forming the basis of the 3G cellular systems worldwide.

The concept of message-based charging was also devised, in which the user paid for each call and was not forced to pay all at once for the installation of expensive lines Aside from the fact that it carried voice, the telephone was thus fundamentally different from telegraph in two more ways it served almost everyone directly, and connections were set up and taken down in a switched way We see that the telephone in North America began as a private business whose service was aimed at the entire public In Europe, the telegraph was already organized in the PTT mode, and telephone was absorbed into that structure It was natural to see telephone as an adjunct to the telegraph, as a service that delivered short, nonreal-time messages, and perhaps mainly for this reason, the development of telephone as a universal public service was delayed in Europe.

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