Circuit Switch and Packet Switch are Physically Present or Just logically?

Question

In LTE, everything is based upon Packet Switch.. Right? Then, What happens if Circuit Switch Mobile tries to connect LTE mobile?

In Packet Switch any communication is possible based upon IP address.. Right? We are not getting IP unless we connect over mobile to Internet (after the attach procedure IP will be with SGW, Not with the UE) (Tested). So, Is it not possible to make/receive a call without connecting with internet?

Basics but very confusing..Please help

Comments

Are you talking about CSFB, CSFB (Circuit Switched FallBack) is a technology whereby voice and SMS services are delivered to LTE devices through the use of GSM or another circuit-switched network.

Please clarify?

Answer 1

In LTE, even a voice call can be packet switched via SRVCC or VoLTE. If packet switched voice is not supported in any LTE network, UE can be redirected/handed over to legacy 2G/3G network for circuit switched voice call. UE supporting LTE/3G/2G is capable of doing both circuit switched and packet switched communication.

Comments

Thanks for the help..