What is single voice call continuity?
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 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.
How many types of SRVCC are there?
Case 3 : Following is the overal Protocol Sequence for SRVCC….SRVCC Evolution.
| Common Name | 3GPP Release | Description |
|---|---|---|
| eSRVCC | Rel 10 | Enhanced SRVCC (Support for MSC Server assisted Mid Call Feature) |
| bSRVCC | SRVCC at Pre-Alerting Phase | |
| vSRVCC | Rel 11 | Video SRVCC |
| rSRVCC | Rel 11 | SRVCC from UTRAN/GRAN to E-UTRAN |
What does SRVCC stand for?
Single Radio Voice Call Continuity
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.
What is SCC AS in IMS?
IMS SCC includes the IMS Centralized Services and IMS Service Continuity Specifications. IMS SCC would be used in support of SR-VCC (Single Radio Voice Call Continuity), which allows a subscriber conducting a VoLTE call to handover to the 2G/3G network without the call dropping.
What is IMS in VoLTE?
IMS – IP Multimedia Subsystem is a standalone system. It resides out of the LTE network and connected to PDN Gateway through SGi interface.
What is IMS call flow?
The calling IMS subscriber is currently roaming outside the home network. The called user is registered in the home network. The caller and the called user require resource reservation before the call can be setup.
What is mid call SRVCC?
3GPP Rel-10: Introduces procedures of enhanced SRVCC including support of mid-call feature during SRVCC handover (eSRVCC); support of SRVCC packet-switched to circuit-switched transfer of a call in alerting phase (aSRVCC); MSC server-assisted mid-call feature enables packet-switched/ circuit-switched access transfer …
What is IMS in LTE?
IMS – IP Multimedia Subsystem is a standalone system. It resides out of the LTE network and connected to PDN Gateway through SGi interface. All IP packets in uplink and downlink flow through S-GW. S-GW is also responsible for handling handovers.
What is VoLTE handset?
What is VoLTE? As the name suggests, Voice over LTE happens when your carrier allows you to place a phone call over your LTE connection instead of the older legacy voice networks. For example, Verizon Wireless traditionally used 1XRTT for all of your voice calls, relying on LTE for data.