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Unformatted text preview: ll pho ne access pro viders is delivered via cell to wers. While these
pro viders do n’t need to build a residential wired inf rastructure, they still need to secure space f o r
cell to wers, build the to wers, co nnect the to wers to a backbo ne netwo rk, and license the wireless
spect rum (o r airwave f requency space) f o r transmissio n. We need mo re bandwidth f o r mo bile devices, to o . AT&T no w f inds that the to p 3 percent o f its
mo bile netwo rk users gulp up 40 percent o f the netwo rk’s capacity (thanks, iP ho ne users), and
netwo rk strain will o nly increase as mo re peo ple ado pt smartpho nes. These users are streaming
Majo r League Baseball games, explo ring the planet with Go o gle Earth, watching Yo uTube and
Netf lix, streaming music thro ugh P ando ra, and mo re. Get a bunch o f iP ho ne users in a cro wded
space, like in a co llege f o o tball stadium o n game day, and the result is a netwo rk-cho king data
traf f ic jam. AT&T estimates that it’s no t unco mmo n f o r 80 percent o f game-day iP ho ne users to
take o ut their pho nes and surf the Web f o r stats, snap and uplo ad pho to s, and mo re. But cell
to wers o f ten can’t handle the lo ad.R. Farzad, “AT&T’s iP ho ne Mess,” BusinessWeek, February 3,
2010. If yo u’ve ever lo st co verage in a cro wd, yo u’ve witnessed mo bile netwo rk co ngestio n
f irsthand. Trying to have eno ugh capacity to avo id co ngestio n traf f ic jams will co st so me serio us
co in. In the midst o f custo mer co mplaints, AT&T co mmitted to spending $ 18 billio n o n netwo rk
upgrades to address its wireless capacity pro blem.C. Edwards and O. Kharif , “Sprint’s Bo ld P lay o n
a 4G Netwo rk,” BusinessWeek, March 30, 2010. Table 12.1 Average Demand Usage by Functio n
Net Radio Deman d
60 MB/hr. YouTube 200–400 MB/hr. Co n ven tio n al mo b ile p h o n es u se an estimated 100 MB/mo n th , iPh o n es 560 MB/mo n th , an d iPad s
almo st 1 GB/mo n th .
So urce: R...
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This document was uploaded on 01/31/2014.
- Winter '14