What is SGsAP?

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 SGs in LTE?

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 SG 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.

How is the SGS interface used in LTE?

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.

How is S1AP paging used in LTE call flow?

S1AP paging message in LTE Information Elements Value UE Identity Index 0 to 1023 UE Paging Identity S-TMSI or IMSI Paging DRX 32, 64, 128, 256 Core Network Domain PS or CS

Which is LTE paging procedure is for PS data call?

• If the LTE paging procedure is for PS data call, UE includes service request NAS message within RRC connection setup complete message. • If the paging procedure is for CS fallback call, UE includes extended service request NAS message within RRC connection setup complete message.

What does dsTest do for the SGS interface?

dsTest supports server emulation and client simulation capabilities for Short Message Service (SMS) on the 3GPP TS 29.118 (SGsAP) SGs interface. Test MME SGs interfaces in LTE networks with our Visitor Location Register Emulator/SMS Message Service Center.