What is SGs interface?
The SGs interface is an optional interface between a 2G (GERAN) / 3G (UTRAN) MSC and an LTE/EPC MME. It’s purpose is to facilitate both CSFB (Circuit-Switched Fall Back) and SMSoS (SMS over SGs).
What is SMS over SGs?
SMS over SGs Overview SMS over SGs is an interim solution to realize the transmission of native SMS from CS infrastructure over the LTE radio network. The SMS is transferred via SGs to MME and carried in NAS signaling to the UE, avoiding the need to execute fallback to a 2G/3G network.
What is SGsAP protocol?
SGsAP is designed to facilitate mobility management and paging procedures on the SGs interface, as part of CSFB (Circuit Switched Fallback) operation. In addition, SGsAP permits the transfer of SMS delivery via the circuit switched core network when IP based messaging services are not available.
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 is SMS and IMS?
SMS is a feature that was developed for cellular phones as an alternative to calling. With SMS you can leave short messages even if the person does not answer his phone. IM, on the other hand, was developed and is still predominantly used in personal computers; thus IMs utilize the internet for passing its messages.
What is the LTE SMS?
In LTE (packet-based all-IP) network, the circuit switched SMS service is handled adopting Circuit switched fall-back (CSFB) technology. So, when an LTE device is used to place a voice call or send SMS, the device “falls back” to the 3G or 2G network over SGs interface to complete the call or to deliver the SMS.
What is CS FallBack in LTE?
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 GS interface?
The Gs Interface is a GPRS interface which is located between the SGSN (Serving GPRS Support Node) and the MSC (Mobile Switching Centre).
What is MME in LTE?
The mobility management entity (MME), which presents a key control node for the LTE access network, manages UE access network and mobility, as well as establishing the bearer path for UE’s.
How do I test Mme SGS interfaces in LTE networks?
Test MME SGs interfaces in LTE networks with our Visitor Location Register Emulator/SMS Message Service Center. Use the SGs Interface application to test the capacity and performance of a VLR/MSC in support of Circuit-Switched Fallback in the Evolved Packet System (EPS). SGs is a stateless interface.
What is the SGS interface used for?
The SGs interface is an optional interface between a 2G (GERAN) / 3G (UTRAN) MSC and an LTE/EPC MME. It’s purpose is to facilitate both CSFB (Circuit-Switched Fall Back) and SMSoS (SMS over SGs). It is used for Mobility management (MM) and paging procedures between the EPS (Evolved Packet Services) and CS (Circuit Switched) domain.
How does the MSC keep track of which Mme the UE is using?
However for incoming calls destined to the UE (Mobile Terminated) the MSC needs a way to keep track of which MME is serving the UE so it can get a message to the MME and the MME can relay it to the UE, to tell it to drop to a 2G or 3G network (Circuit Switched network).
What is SGS in Osmo-MSc?
SGs is supported by osmo-msc. The SGs interface is an optional interface between a 2G (GERAN) / 3G (UTRAN) MSC and an LTE/EPC MME. It’s purpose is to facilitate both CSFB (Circuit-Switched Fall Back) and SMSoS (SMS over SGs).