(keitai-l) Re: Question

3G has a potential maximum throughput of 2Mbits, but this is only
theoretical, as it curtails the availability of the maximum number of
channels (3G allows you to communicate through a number of parallel
connections, commonly referred to as channels). Here is a little list with
maximum and perceived "real" transmission speeds on different mobile
standards:

HSCSD:
Max: 56k
Real: 38,4k

GPRS
Theoretical Max:170k
Anticipated Max: 115k
Real: 43k

Edge:
Max: 384k
Real 354k

3G
Max: 2M
Real: 384k

Hope this to some extent answers your question.

Kristian Solberg

	----------
	From:  daniel dolan [SMTP:dan@glocom.ac.jp]
	Sent:  Monday, May 29, 2000 12:52 PM
	To:  keitai-l@appelsiini.net
	Subject:  (keitai-l) Re: Question

	Hi Dan,

	It seems that there will be at least two 3G
	services available in Japan--NTT DoCoMo and
	J-Phone both adopting direct-spread CDMA
	(DS-CDMA), and IDO-DDI adopting cdma2000
	(MC-CDMA).

	Projected launching dates in the Kanto area are
	May 2001 for NTT DoCoMo, December 2001 for
	J-Phone, and September 2002 for IDO-DDI.

	Regarding speeds, NTT DoCoMo claims in recent
	promotional literature that its W-CDMA technology
	(which is how it refers publicly to DS-CDMA) will
	operate at 384 Kbps, but that in field tests
	speeds of 2 Mbps were reached. I have not seen
	J-Phone's projections, but I imagine that they are
	similar. IDO-DDI seems to be considering using
	high data rate (HDR) technology developed by
	Qualcomm to deliver rates of up to 2.4 Mbps. HDR
	uses asymmetric rates or 150-300 Kpbs upstream and
	600 Kpbs-2.4 Mbps downstream.

	All of this leaves unanswered your question
	regarding shared 3G speeds of 2 Mbps.  Can anybody
	address this?

	--Dan Dolan



	>I have a perhaps na?e question - Re: the 3G 2mbps mobile
	>service that will be introduced in 2002 in Japan?
	>Specifically, I have heard that this is a "shared" 2 mbps.
	>Can someone explain what are the implications of that for
	>the actual effective data rate that will be available to
	>users?  Furthermore, what will be the data rate of the
	>uplink?
	>
	>Thank you
	>
	>Dan Isenberg