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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 (36844)	9/6/2003 1:11:01 PM
From: Eric L	Read Replies (1) \| Respond to of 196546

Backwards compatibility Ron, << Now I believe you when you say the standards contain definitions of forward and backward compatibility. But they apparently do not first meet the common English definitions ... >> Yes they do, albeit technical English, or Chinese, or Korean, or whatever they have been translated to by the applicable 3GPP2 OP. << You can get cellular service in both RANs .. but that's because of backward compatibility of the handset (via its dual modes) >> Backward compatibility with what? << Now picture two "GSM" RANs side-by-side .. the first a GSM network .. and the 2nd a WCDMA network. >> When you say "network" you are referring to a GSM Base Station Subsystem (BSS) which is evolving to the GERAN in Rel-5, and a 3GSM WCDMA Radio Network Subsystem (RNS), but you are ignoring the CN to which they are attached and without which they provide no "cellular" voice or data services whatsoever. I can clearly picture those two network subsystems side by side. Now you picture them, then define the common network components, services, and protocols that govern those services and trace them back from the reference interconnection point Iu for the WCDMA RNS, and the A and Gb interconnection points for the GSM GPRS BSS through the evolved (and still evolving) components of the GSM CN. On the GSM1X network where a CDMA RAN is connected to a GSM MAP core that you have been struggling with, and for which you have invented something called "GSM1x' mode, a soft switch protocol convertor is employed to deal with compatibility issues when you are operating your dual-mode GSM GPRS/cdma2000 handset in CDMA mode. By contrast the 3GSM platform was designed from its inception with backward compatibility with GSM Phase 2+ in mind so that regardless of which milepost of the motorway he is at, a Vodafone (e.g.) subscriber can obtain common and uniform voice and circuit-switched or packet data services seamlessly as WCDMA coverage is built out and expanded - someday <g>. - Eric -