GSM phone roaming in a CDMA only network
Posts: n/a Can someone tell me with factual support for their answer, if a GSM quad band cell phone enters into a CDMA only network service area, will the GSM cell phone be able to roam on the CDMA network? Or will there simply be no service for the GSM phone? Thank you! Zipper Head  Responses to "GSM phone roaming in a CDMA only network"
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Posts: n/a Re: GSM phone roaming in a CDMA only network On Sat, 06 Mar 2004 22:22:20 GMT, "Zipper Head" <zipperh@punkass.com>wrote: >Question: > >Can someone tell me with factual support for their answer, if a GSM quad >band cell phone enters into a CDMA only network service area, will the GSM >cell phone be able to roam on the CDMA network? Or will there simply be no >service for the GSM phone? > >Thank you! > >Zipper Head > The GSM phone will only see the CDMA base as noise, and vice versa. GSM uses a QPSK modulation scheme on a time division basis (217 time slots per user per second, 8 users per 200 Khz channel). CDMA involves essentially continuous tranmission using a spreading code in a 1.23Mhz Channel. Neither system has the ability even recognize the existence of the other. If they occupy the same spectrum, odds are the CDMA system will come out worse for the experience.
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