AT&T tests 384Kbbs mobile system. This compares to QCOM 144Kbps mobile data system currently being installed by Verizon and Sprint and SK in Korea and DDI in Japan. The QCOM 1X MC XRT2000 CDMA system can repidly be updated to a 2.4 Mega bps 1X MC w/ HDR system by installation of already tested hardware in a few months.
JohnG
From Engineer on SI:
"In HDR, it can use one of the possible 1.25 MHz wide frequency slots for the HDR data. In a basic system you
have the frequency space split into many 1.25 MHz bands. Usually these are all voice. Bu the fact that HDR and
voice are on similair band sizes makes it even more flexible than the WCDMA scheme. The operator can mix and
match the bands as they need them. Put on 7 bands of voice and one band of HDR during the peak hours (rush hour
traffic) and perhaps mix it to 4 bands of voice and 4 bands of HDR during peak internet access time (evenings
from 6-11 PM). The flexibility far outwieghs the loss of freqneucy space.
I believe we are into the most major FUD attack to try to get European vaporware accepted before Qualcomm
comes out with their already tested system. Q is only a few months away from having 1xrtt plus HDR on the MSM
chip and the radio doesn;t change, so expect the HDR rollout to be very fast when it happens."
AT&T plans high-speed mobile data tests
By Bob Brewin
06/06/2000 AT&T Wireless Services will conduct tests this summer of next-generation
wireless services designed to provide mobile users with a data throughput of up to 384K
bit/sec., more than a tenfold increase from the highest data rate available to cellular
telephone users today, the company said.
Redmond, Wash.-based AT&T Wireless said the tests would involve engineers working at
company facilities in Redmond, California and New Jersey. AT&T will use equipment from
Brampton, Ontario-based Nortel Networks Corp. to provide wideband services using
enhancements to the Timed Division Multiple Access protocol. Peter McKinnon, vice
president for wireless Internet at Nortel, said the AT&T test "will demonstrate the ability to
provide consumers and businesses with speedy downloads and high-capacity connections on
wireless devices . . . mobile phones, handheld devices (and) laptop computers."
Last month, Sprint PCS Group in Kansas City and and San Diego-based Qualcomm Inc.
kicked off a next-generation mobile data test using an advanced version of the Qualcomm
Code Division Multiple Access protocol that provided throughput of 144K bit/sec.
While AT&T and Sprint conduct tests, Metricom Inc. in Los Gatos, Calif., has started a
nationwide build-out of its Ricochet wireless data service, which will provide users with
128K bit/sec. access. Metricom currently offers 28.8K bit/sec. service in the Seattle and
Washington DC areas and has already started construction or provides 128K bit/sec. service
in 21 markets, with preliminary work ongoing in another 25 markets. Metricom said it will
eventually serve a population of more than 100 million with its high-speed service in those
46 markets, which include major cities such as Atlanta, San Diego, Philadelphia, Chicago
and Houston. |
