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To: Eric L who wrote (12881)	6/21/2001 1:24:50 AM
From: Eric L	Read Replies (1) \| Respond to of 34857

re: (Good) Comments on 1xRTT Network Stability in Korea Posted here without permission from carranza2 ... but a good post ... To:Getch who wrote (11854) From: carranza2 Wednesday, Jun 20, 2001 6:13 PM This might help while engineer warms up his keyboard. From compewterDoctor at RB Club: I wanted to comment on a report out of Korea describing difficulties in handoff when moving from 95C (1X) to 95B. See: Message 15968487 There are reasons that the rest of the world is behind the Koreans in implementation--In particular, Lucent does not expect to have working systems until the end of the year. It is not that the Koreans are ahead of Lucent, its just that they've fielded a less polished implementation, in the same way you can download a "preview" release of software off the network. So there are going to be rough edges. And any observer knows that there is significant issues with performing the handoffs in any wireless technology. There are problems specifically cited with respect to GPRS, WCDMA asynchronous scheme, and there is a significant portion of the key Qualcomm IPR which is devoted to handoff. What seems to be happening here (if the report is credible) is that there is a drop during the handoff from cdma2000 to cdmaOne base stations. There is no problem with: . cdma2000 base station handoffs, or . mixing cdma2000 and cdmaOne handsets in either cdma2000 or cdmaOne base stations (at least as far as anyone understands). So, its a relatively minor issue but one which needs to be addressed. Note also that the Koreans have at least a couple of hundred thousand cdma2000 subscribers so they've also loaded up there system to very substantial levels. Also, some issues seem operator specific which may mean that they are vendor specific. I believe both Samsung and LG are supplying infrastructure, so I would guess LG is having a bit more problems since they are the later entrant. When operators do something to slow down deployment, it usually means the system is not ready (as the recent flap over msm5105 chips not being good enough for the Korean market). So my read is that we are just seeing the normal technical challenges that occur when bringing a new technology to market. But the amount of commonality is high among cdma2000 and cdmaOne. In relationship to other technology handoffs, Qualcomm is very conservative. . The TDMA->CDMA scenario invisioned by the CDG white paper uses only the existing Analog-CDMA handoffs: the operator must build a full parallel CDMA network. . The GSM scenario is for a data only parallel service, meaning that its data so a small interuption rather than a seemless handoff is sufficient. Its good to hear about the problems in Korea: they must be having some or else everyone else would have fielded cdma2000 by now. They seem--and you never know until they're solved--to be very managable. --the doctor << - Eric -