Date: Mon, 22 Jan 2001 23:08:12 -0000 (GMT) From: Duncan Barclay <dmlb@dmlb.org> To: "Michael C . Wu" <keichii@peorth.iteration.net> Cc: freebsd-chat@FreeBSD.ORG, Brad Knowles <brad.knowles@skynet.be>, Michael C.Wu <keichii@iteration.net>, Greg Lehey <grog@lemis.com> Subject: Re: Mobile phone coverage (was: VCD (was Re: cvs commit: src/sys Message-ID: <XFMail.010122230812.dmlb@computer.my.domain> In-Reply-To: <20010121223131.C45892@peorth.iteration.net>
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On 22-Jan-01 Michael C . Wu wrote: > On Mon, Jan 22, 2001 at 01:56:50PM +1030, Greg Lehey scribbled: >| On Sunday, 21 January 2001 at 21:10:08 -0600, Michael C . Wu wrote: >| > You can find out more about W-CDMA and 3G phones in >| > the Artech House Publishers' "Mobile Communications Series" of books. >| > I have the entire collection. :) >| >| I've been looking at web pages, and it doesn't sound to me that 3G is >| a new transmission technology, just something that climbs on the back >| of one. Is there any reason why it should be tied to CDMA and not to >| GSM? > > It is not a very new technology. However, I should point out to you > that GSM is a totally different layer from CDMA. CDMA handles > the transmission, GSM is more like our authentification scheme. As I mentioned in an earlier email - 3G gives greater network capacity. I.e. more users per square furlong making call. Thus, operators get more money. It does this ny replacing the physical/wireless layer with a CDMA technology. Most of the network stays the same. GSM overs everything from the RF signal to how to plug a GSM network into a PSTN (i.e. normal trunk network). 3G also adds some nice services but these are available with GPRS. >| > There are less regulation and much greater demand for the technology >| > in Asia. In many Asian countries, (.jp, .tw, .hk, .sg), it averages >| > to two or three cell phones for the entire population. >| >| Nonsense, I've seen dozens of mobile phones in cramped places. I'd >| guess that just about everyone has one. Are you thinking of Bhutan or >| Aden, maybe? > > I know it is true for Japan and Taiwan at least. I think the above is meant to be "two or three cells phones for each of the entrire population". > -- > +------------------------------------------------------------------+ >| keichii@peorth.iteration.net | keichii@bsdconspiracy.net | >| http://peorth.iteration.net/~keichii | Yes, BSD is a conspiracy. | > +------------------------------------------------------------------+ Duncan --- ________________________________________________________________________ Duncan Barclay | God smiles upon the little children, dmlb@dmlb.org | the alcoholics, and the permanently stoned. dmlb@freebsd.org| Steven King To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-chat" in the body of the message
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