What is blind CSFB?
Blind CSFB: This is the most common type of CSFB implementation where the eNB will send the UE blindly to 3G/2G. In this case, the eNB will send a RRC Release with the target RAT’s frequency and the UE will be redirected to that frequency.
What does CSFB happened mean?
Circuit Switched Fallback (CSFB), with the help of a global system for mobile communication (GSM) or another circuit-switched network, delivers voice and SMS services to LTE devices. The necessity for a Circuit Switch FallBack for the packet-based all-IP network, LTE, which cannot support circuit-switched calls.
What is the difference between Srvcc and CSFB?
CSFB is a service handover procedure while SRVCC is a coverage handover procedure.
What interface does CS FallBack use?
interface SGs
The support CS fallback in EPS a new interface SGs is added in LTE architecture. SGs interface is the reference point between the MME and MSC server. SGs interface is used for the mobility management and paging procedures between EPS and CS domain, and is based on the Gs interface procedures.
What is VoLTE call flow?
Voice over LTE (VoLTE) is the standard for voice call setup in LTE networks. When VoLTE is deployed, phones will not need to fallback to 3G for voice calls. VoLTE uses IMS signaling to setup voice calls. The following VoLTE call flow describes the IMS call setup and release.
What is Srvcc in LTE?
Single radio voice call continuity (SRVCC) is an LTE feature that allows a VoIP/IMS call in the LTE packet-switched domain to be transferred to a legacy circuit-switched domain (GSM/UMTS or CDMA2000).
What is CSFB call flow?
LTE to 3G UMTS CSFB call flow Describes the complete flow of circuit switched fallback from an LTE network to UMTS. You can click on most messages in the flow to reveal full details about individual messages.
What is CSFB in 5g?
The CS FallBack (CSFB) in EPS enables the provisioning of voice and other CS-domain services (e.g. CS UDI video, LCS, USSD) by reuse of CS infrastructure when the UE is served by E-UTRAN. A CSFB enabled terminal, connected to E-UTRAN may use GERAN or UTRAN to connect to the CS-domain.
What is difference between CSFB and VoLTE?
CSFB vs VoLTE CSFB (Circuit Switch Fallback) is a technology that supports voice and SMS services in 4G networks using the 2G/3G systems. VoLTE (Voice over LTE), on the other hand, means that a call is made through a 4G network (Making calls over IP).
What is the difference between SRVCC and eSRVCC?
SRVCC allows subscribers to continue an ongoing call when roaming from an E-UTRAN to a UTRAN or GERAN. SRVCC, proposed by 3GPP, is aimed to resolve the voice call continuity problem facing subscribers at early LTE deployment phase. eSRVCC is introduced to shorten the speech gap caused by SRVCC handovers.
Which interface is required for CSFB in LTE?
the SGs interface
CSFB function is realized by reusing Gs interface mechanisms, as defined in 3GPP TS 29.018, on the interface between the MME in the EPS and the VLR. This interface is called the SGs interface. The SGs interface connects the databases in the VLR and the MME. This feature requires that a valid license key be installed.
What is LTE IMS?
LTE (Long Term Evolution) and IMS (IP Multimedia Subsystems) are both technologies developed to cater the next generation of the broadband mobile services. LTE is actually a wireless broadband technology developed to support roaming Internet access using mobile phones.