Silicon Investor (SI) -- The First Internet Community

STOCKTALK

We've detected that you're using an ad content blocking browser plug-in or feature. Ads provide a critical source of revenue to the continued operation of Silicon Investor. We ask that you disable ad blocking while on Silicon Investor in the best interests of our community. If you are not using an ad blocker but are still receiving this message, make sure your browser's tracking protection is set to the 'standard' level.

Technology Stocks : Qualcomm Moderated Thread - please read rules before posting -- Ignore unavailable to you. Want to Upgrade?

To: JohnG who wrote (11387)	6/7/2001 10:19:22 AM
From: Eric L	Respond to of 196702

JohnG << Earlier articles quoting Sprint officials indicated that Sprint planned to impose a max data rate in 1X to enhance total system performance. >> I have not seen anything that specifically says they will impose a max data rate but in a May "Wireless Review" Article called "Field Trial & Error" Sprint PCS CTO Oliver Valente was quoted as saying: "What we think that'll be and how we're designing our network is under a loaded condition to be in the 70kb/s range," Similar to what you are saying - but not precisely the same. The article is quite good. It emphasizes the planning that has gone into what should be a spectacular implementation of 1xRTT in the not too distant future. and talks to the danger of overhyping data rates. Complete article here: telecomclick.com The section dealing with data throughput and average user speeds is excerpted below: >> *"BLINK SPEEDS"* Later this year, when Sprint PCS rolls out 1X in the initial markets, which the company hasn't yet released, it will offer data rates of 144kb/s. So what does Valente think is more important - the data rate or the performance? "You have to be careful on the whole data rate because you don't want to overhype the capability," he said. "When we've talked about the data speeds, we've always said ‘up to’ 144kb/s. When you're into 1X, say it's ‘up to’ 307kb/s; 1X-EV-DO gets you ‘up to’ 2.4Mb/s, then beyond that, 3Mb/s to 5Mb/s. Those are peak data rates." According to Valente, average data speeds will be more important to consumers. "What we think that'll be and how we're designing our network is under a loaded condition to be in the 70kb/s range," he said. At 70kb/s, will consumers be able to see a difference or have the perception of it being slow or fast? "At 20kb/s to 30kb/s, e-mail works extremely well. Beyond that, you aren't really noticing what we would call a blink-speed difference," he said. "If you're faster than 30kb/s, based on the application, you aren't really going to notice any improvement beyond 30kb/s." Valente said the company is applying that same logic to all of the applications - e-mail, Web browsing, audio streaming and video streaming. "We're trying to get to the application speed where, beyond a certain point, the user wouldn't have a perceptibly different experience." << Related to this, McKinsey & Company published an interesting slide set called "Next Generation Wireless Networks": newamerica.net Interesting Slide 4 titled "Data Rates Vary Widely With Radio Connection" uses 3GPP2 1XEV-do as an example based on Qualcomm information to IEEE Communications Magazine. It gets into the issue of practical user rates we can eventually expect from cdma2000 service and discusses the applications suitable for data rates offerred by the various emerging technologies: newamerica.net Slide summarry (last bullet most important): >> DATA RATES VARY WIDELY WITH RADIO CONNECTION * Lead to large variations in user experience Multiple external factors affect link quality and lead to large variations in user experience • User proximity to base station • Radio environment and external interference • Topographic Barriers • User mobility • Only small fraction of users could experience peak speeds • Variations in service level will be highly pronounced, unless managed down << The slide shows "Percent of users in a sector" that will experiecne various (widely varying) data rates in a "Macrocell network with 3 sectors per cell - HDR (1XEV- do) example, fixed model - no fast fading" from data supplied by Qualcomm. - Eric -