Csfb (circuit switch fall back)

1,820 views 7 slides Aug 30, 2016
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About This Presentation

CSFB CALL FLOW & BASICS


Slide Content

CSFB (CIRCUIT switch Fall Back)

CSFB Network Architecture UE LTE - Uu E - UTRAN MME S1 - MME UTRAN GERAN Um Uu MSC Server Iu - CS A SGs UE LTE - Uu E - UTRAN MME S1 - MME UTRAN GERAN Um Uu MSC Server Iu - CS A SGs

CS Call Request in E-UTRAN, Call in GERAN/UTRAN

Mobile Terminating call in Active Mode - PS HO supported

SMS over SGs is independent from CS Fallback; meaning it does not trigger CS Fallback to UTRAN or GERAN. As no fallback takes place, SMS over SGs does not require overlapped coverage of LTE and legacy technologies. CSFB SMS-MO

CSFB SMS MT

Reference(s) -: 3GPP TS 29.118 MME – Visitor Location Register (VLR) SGs Interface Specification 3GPP TS 24.301 Non-Access-Stratum (NAS) Protocol for Evolved Packet System (EPS ) 3GPP TS 23.018 Basic Call Handling 3GPP TS 23.002 LTE; Network architecture 3GPP TS 23.272 Circuit Switched Fallback in Evolved Packet System