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Author Topic: Access network:ANSI CDMA/GSM TDMA; Core Network:GSM MAP/ANSI ??  (Read 456 times)
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« on: January 29, 2007, 14:58:04 UTC »

Are both the following variants technically possible?
Access network - ANSI CDMA
Core Network - GSM MAP SS7 stack

Access network - GSM TDMA
Core Network - ANSI SS7 stack

SMS Forum Support
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« Reply #1 on: January 31, 2007, 01:06:49 UTC »

TDMA ANSI-41 MAP + GSM as a custom teleservice.. otherwise known as GHOST (Gsm HOSted Teleservice).

Not sure if its still in use.. but certainly 5-6 years ago, there was some talk among TDMA carriers in the US of deploying this technology. I don't think the same concept was achieved for CDMA and this may have been because the 3G effort was to apply GSM MAP with w-CDMA radio.. effectively evolving both to the one technology

Other than that, I don't know anymore.

   Cormac Long
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« Reply #2 on: February 08, 2007, 17:06:53 UTC »

"GSM1X" is defined (somewhere) as GSM MAP in the core, with the (ANSI) CDMA 1X air interface. I think it might have been intended for China, but it is not commercially deployed anywhere.

I don't think that there is any chance of ANSI-41 MAP with a GSM-based air interface.

So the answer is 1) - technically possible but doesn't exist today, 2) - no.

Note that there is no restriction on the core SS7 transport layers (as opposed to MAP): GSM MAP over ANSI MTP/SCCP is presumably used for Nth American GSM operators (I don't know which TCAP is used), and ANSI-41 and ANSI TCAP over ITU MTP/SCCP is common for (ANSI) CDMA operators outside North America.

In the 3G world, "DS-41" and "MC-MAP" have been defined as the "crossover" core vs access combinations, but I don't think these progressed beyond paper.

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