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

To: John Biddle who wrote (31487)	1/22/2003 10:34:21 AM
From: rkral	Read Replies (1) \| Respond to of 197065

John, re "at all the locations where GSM1x BTSs are implemented" A "GSM1x BTS", as you call it, is really a 1x BTS. That the 1x overlay (air-interface and hardware) for GSM1x is primarily a standard CDMA2000 1x Radio Access Networks("RAN"), is one of its bigger selling points. (That sounds a bit funny, since no GSM1x systems, or only a few trial systems, have apparently been sold.) A brief review There are three major components of a cellular network: the terminal, the RAN, and the Core Network("CN"). Obviously, the terminal is the phone, but it can also be a PDA, a computer, etc. The CN is aka the telephone network, the data network, or a combination of the two. A Mobile Application Part("MAP"), a software protocol stack, is a component of the CN. I will refer to a CN with GSM MAP as a "GSM CN". A GSM1x installation includes a 1x RAN overlay of a GSM RAN. Now .. GSM1x is intended to serve (1) GSM phones, (2) GSM phones using the 1x air-interface, and (3) 1x phones using the 1x air-interface. re (1): The GSM RAN supports the GSM phone .. and the GSM RAN connects directly to a GSM CN. re (2): For serving a phone with a 1x air-interface and a GSM software protocol stack, the 1x RAN could be connected directly to the GSM CN .. theoretically, at least. (I recall reading that the 1x RAN specification supported both the IS-41 MAP (for CDMA) and the GSM MAP. If pressed, I will try to find a link.) re (3): However, in order to support a 1x phone, which has a 1x protocol stack layered on the 1x physical, a GSM1x protocol converter is placed between the 1x RAN and the GSM CN. Why exactly? I don't know .. but subscriber identification is probably one of the conversions. re "There is no such thing as a GSM1x user" I see nothing wrong with the "GSM1x user" term. That's a person with a GSM1x phone, to my mind. Per above "discussion", it should be clear that a phone with a GSM protocol stack and a 1x air-interface can be properly called a GSM1x phone. Whether the GSM1x phone would be different from a general-purpose dual-mode GSM/CDMA 1x phone is unclear to me. One consideration is UIM/SIM/USIM support. Specifically, does the Universal Subscriber Identity Module("USIM") meet both CDMA requirements and GSM requirements? I think it does. As noted above, there are two different software protocols for the 1x air-interface. Will one phone "know" which protocol to us? I think such phones will exist .. if they don't already. Hopefully, I've indicated all opinions with "think", e.g. Regards, Ron