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

To: rkral who wrote (20158)	3/9/2002 5:02:00 PM
From: John Biddle	Read Replies (1) \| Respond to of 196633

From an OSI RM viewpoint, GSM1x is GSM "running over" cdma2000 1x ("1x"). The GSM network services available are determined at the GSM 'application layer'. The services usually available in a 1x network are irrelevant. Thanks for the slap upside the head. I don't know why I was looking at this upside down, but it's clear that I was. This explanation makes clear to me that there will be no limitation to a user with a 1x phone when he connects to a GSM1x base station as compared to the same user and phone connecting to a native CDMA1x system. If I'm preaching to the choir or just stating the obvious, I apologize. I do know about OSI, but needed the reminder to apply it properly. And don't ever be shy on this board about offering answers if you think you have them. You may help many of us who can use it. At worst you may turn out to be wrong and learn something yourself. All in all a pretty good deal.

To: rkral who wrote (20158)	3/10/2002 4:46:33 PM
From: Keith Feral	Read Replies (1) \| Respond to of 196633

Ron: After weeks of racking my brains on the subject, I think that I have finally come up with a decent idea where GSM 1X can help companies like Unicom. With their GSM MAP networks controlling GSM/GPRS air interface equipment and their ANSI 41 core networks controlling CDMA1X networks, Unicom has a unique situation to use GSM1X overlay to their GSM MAP core networks to replace existing GSM spectrum or to support GSM1X in new 3G spectrum. GSMMAP/GSM1X would then enable their GSM MAP core networks to support current GSM phones and new GSM1X phones (MSM6300). The CDMA networks will be able to handle GSM1X phones or 1X phones. They get the best of both worlds. First, they can drop current GSM base stations and replace with GSM1X base stations on top of GSM MAP core networks to handle current spectrum. If Unicom had a dual mode (900/1800 MHZ) GSM systems in place right now, it would be very effective to drop 1 of the carriers in the 900 or 1800 MHZ spectrum and to replace it carrier with GSM1X. They would gain far more capacity and high speed data by dividing their spectrum allocation from 100% GSM to 1/2 GSM and 1/2 GSM1x. Why do 2 GSM channels poorly? Alternatively, they can build new base stations with a GSM1X air interface on GSM MAP core netorks in new 3G spectrum as an alternative to WCDMA. However, Unicom does not have a 3G spectrum position in place today. Cost is a definite issue for Unicom to obtain 5 MHZ of paired spectrum to put a WCDMA uplink/downlink into position. Unicom is in the best place to benefit from this situation since they already have GSM and CDMA networks. They could continue to leverage the benefit of CDMA2000 for their existing GSM and CDMA customers. They could upgrade their GSM spectrum to support GSM1X and enable their customers to enjoy the same upgrade pathway as "normal" CDMA subscribers. CDMA2000 1X, Rev A (307 kbps), Rev B (614 kbps), Phase 1 (1.25 MBS), and Phase 2 (2.4 MBPS). GSM1X becomes economically powerful as an overlay to GSM MAP core networks when you compare it to deploying 3G CDMA in new spectrum. UMTS requires 10 MHZ of spectrum, new GSM MAP core networks, new WCDMA base stations, etc... With GSM1X, all you are adding is a 1X base station to the unmodified GSM MAP core network & a GSM MSN to act as a switch between the core network and the handset. The cost or an overlay is far cheaper than building a whole new infrastructure, not to mention the cost of spectrum. A conservative view of 3G for GSM in the case of Unicom may end up with GSM1X in current spectrum (900 or 1800 MHZ) to establish a 1.25 MHZ CDMA1X channel. It would save them the added cost of spectrum & core networks. The only thing they would need is new 1X base stations.