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Xiaowei ZHANG

I am reading about VoLGA lately, and found that is interesting.

Operators seem adopting different attitude and action on how to bring voice service into LTE.

My consideration is, does an UE need to support all of them including this VoLGA and CSFB etc, for roaming (especially in another country)?


I also have been reading about VoLGA. I have couple of questions. First how will operator migrating from CDMA to LTE implement this. Second recently i was reading about CS over HSPA, in that basically you would use HSPA radio bearers but core would be legacy CS. Can such a thing be used in LTE ?


Hi Rohit,

Good questions, thanks!

CDMA migration: Not sure, so far I've only seen the specifications for a GSM/UMTS MSC. I don't know if that can be applied to a CDMA mobile switching center as well. I guess Verizon would have to join the VOLGA club to make that work.

CS over HSPA: It would be transparent for VOLGA as the MSC is not really involved in the decision of whether the call goes over a dedicated air interface bearer or over the shared channel.

Kind regards,


Hi Xiaowei,

I think that since there is no consensus in the industry, mobiles are likely to support more than one method. Not ideal...




Thank you for your reply. I wonder how easy or difficult will be for carriers such as Verizon to route voice calls through 1xRTT core similar to VoLGA approach.

As as you said MSC/RNC's would not be aware, i think this can be done by software upgrade at nodeB's/RN's to map the voice traffic to shared channel and the schedular shall take of the rest.


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