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 solution that is expected to deliver voice services over the LTE network in the long-term is Voice over LTE (VoLTE).
What is a CS call?
Circuit-switching and packet-switching are two key techniques used in mobile communications. With Circuit-Switched (CS), a dedicated circuit is engaged for the entire duration of a call or session.
What is Srvcc in LTE?
Single Radio Voice Call Continuity (SRVCC) provides an interim solution for handing over VoLTE (Voice over LTE) to 2G/3G networks. The voice calls on LTE network are meant to be packet switched calls which use IMS system to be made. … QoS is ensured by SRVCC operators for calls made.
What is CSFB and Srvcc in LTE?
CSFB (CS Fall Back): whenever the UE have the need to place a call, make it revert (fallback) for legacy networks. … SRVCC (Single Radio Voice Call Continuity): ensure that purely LTE (VoLTE) calls are transferred (via handover) to the legacy networks in a transparent manner.
What does CSFB stand for?
CSFB (Circuit-Switched Fall-Back): Explained
Circuit Switched FallBack (CSFB) is a technology whereby voice and SMS services are delivered to LTE devices through the use of GSM (global system for mobile communications) or another circuit-switched network.
Does LTE use packet switching?
The LTE standard supports only packet switching with its all-IP network. Voice calls in GSM, UMTS and CDMA2000 are circuit switched, so with the adoption of LTE, carriers will have to re-engineer their voice call network.
What does VoIP mean?
Voice over Internet Protocol (VoIP), is a technology that allows you to make voice calls using a broadband Internet connection instead of a regular (or analog) phone line.
Why is IMS needed?
IMS, or IP Multimedia Subsystem, is often touted as a must-have network evolution for mobile operators that want to derive value from future applications. The goal of IMS is to replace the operator’s current back-end network architecture with an all IP-based system making it easier to deploy applications.
What is VoLTE call flow?
Voice over LTE (VoLTE) is the standard for voice call setup in LTE networks. … VoLTE uses IMS signaling to setup voice calls. The following VoLTE call flow describes the IMS call setup and release. An example of sending an SMS over IMS is also included. Sample RTP and RTCP messages are also shown in the flow.
What is the difference between IMS and VoLTE?
VoLTE stands for Voice over Long-term Evolution. Utilizing the IMS (IP Multimedia Subsystem) technology, it is a specific type of VoIP service designed into the LTE standard, which enables users to make voice calls while simultaneously using data network LTE.
What is the use of VoLTE?
VoLTE calls are voice calls made over the 4G LTE network. They have superior audio quality to regular phone calls made over the standard voice network. VoLTE lets you talk and use 4G LTE data simultaneously, and conduct up to six-way conference calls.
What is IRAT handover?
IRAT Handover Basics. Introduction IRAT (Inter-Radio Access Technology) handover and cell change allows 3G voice and data services WCDMA RAN to GSM transition to maintain the connection with the UE between coverage areas to prevent dropped calls.
What is LTE handover?
Handover procedures are a key function of LTE eNBs. They are intended to reduce interruption time compared to the circuit-switched handover process in 2G networks. … Handover within an E-UTRAN. The procedure for when a UE is leaving a cell managed by the eNB and entering a cell managed by a second eNB.
What is 3G FallBack?
For instance, when an LTE network is not available to make or receive either a call or SMS message, the device “falls back” to a more accessible 3G or 2G network to finish the call or to send the SMS message. CSFB is often viewed as a temporary solution.
What is CSFB 4g?
Circuit Switched FallBack (CSFB) is a technology whereby voice and SMS services are delivered to LTE devices through the use of GSM or another circuit-switched network. Circuit Switched FallBack is needed because LTE is a packet-based all-IP network that cannot support circuit-switched calls.