CSFB process

Hello, dear!

CSFB technology is suitable for scenarios where 2G/3G circuit domain and TD-LTE wireless network overlap coverage. The network structure is simple, no IMS system is required, and the existing CS network investment can be effectively utilized; SRVCC technology is suitable for operators already deployed IMS network, TD-LTE network has been able to provide IM-based voice services, but TD-LTE has not reached the scene of full network coverage; TD-LTE / TD-SCDMA / GSM (GPRS) multi-mode dual-standby terminal optional TD- SCDMA / GSM mode establishes the voice service, selects the PS domain internal accessory network to establish the packet domain service, there are no additional requirements for the network, but the terminal implementation is more complicated.

Dear User,

Framework allowing the provisioning of voice services by reuse of legacy GSM served CS infrastructure when the UE is served by E-UTRAN (LTE).To provide voice call support, Circuit Switch Fall Back is carried out to GSM RAT from LTE RAT to facilitate the voice over LTE (VoLTE) feature.

Thanks!