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5G VoNR (IMS)

Genew Cloud vIMS is flexible for customer, it can also support deployment of the vIMS in customers existing Cloud platform and integration with customer existing MANO to do end to end orchestration.

Introduction

Voice Evolution to 5G

3GPP has specified that 5G uses the 4G voice/video communication architecture and still provides voice/ video communication services based on the IMS. The 4G radio access technology is LTE, and the voice/video over the LTE network is called VoLTE. The 5G radio access technology is NR, and the voice/video over the 5G network is called voice/video over NR (VoNR). VoLTE and VoNR are different access modes for IMS voice/video communication services.


mSwitch IMS 5G Voice EPS Fall Back

The 5G NR network does not provide voice/video communication services at the initial stage. When the gNB establishes an IMS voice/video communication channel on the NR network, a handover is triggered. In this case, the gNB sends a redirection or inter-RAT handover request to the 5GC to fall back to the LTE network and use the VoLTE service.

UE of EPS FB is similar to that of 4G CSFB. If the UE camping on the 5G NR network makes a call, the voice/video communication and data services fall back to the 4G network. The connection duration is 1 to 2 seconds

longer than that of the VoNR. However, there are differences between UE of EPS FB and that of 4G CSFB. For example, certain services, such as USSD, do not trigger EPS FB.


mSwitch IMS 5G Voice EPS Fall Back

Step 1: In the UE calling or called scenario, the IMS system triggers the dedicated bearer establishment process according to the SIP interaction.

Step 2: The 5GC sends a dedicated bearer establishment request to the NG RAN.

Step 3: The NG RAN comprehensively considers whether VoNR is allowed, factors include UE capability, N26 deployment, LTE wireless conditions, and whether VoNR is enabled / supported. The LTE signal measurement can be optionally started.

Step 4: If the NG RAN decides EPS Fallback, it waits for special reasons to reject the establishment of the dedicated bearer, and 5GC starts waiting for the UE to fall back to 4G.

Steps 5 to 6: The NG RAN selects the Redirect or Handover mode to LTE according to the terminal capability and deployment situation. For the scenario without N26, step 6 AN Release (NR-> UE) triggers the 5G-> 4G migration process. Because SIP is a UDP message, the migration process is interrupted for a long time, the message is severely lost, and SIP retransmission is triggered. Call resume.

Step 7: After 5GC finds that the UE has finished falling back to 4G, it sends a dedicated bearer establishment request to the eNodeB again.

Step 8: The call continues.


Family - Genew Core Network:

Core

Network

mSwitch IMS

Based on the aTCA/ x86/ Cloud Deployment;  Support 5M subs;  Support 

1+ 1 Redundancy & Geographic Redundancy;  Accompanied with powerful 

I/S/P-CSCF,  MRFC,  BGCF,  MGCF,  AGCF,  iUMG,  iSG,  PCRF,  O&M,  

HSS,  Provisioning/ENUM,  BOSS,  EMS,  AS,   SBC,  etc.

mSwitch 5G Core

Based on the NFV/Cloud Deployment;  Support 5M subs;  Support 1+ 1 Redundancy & Geographic Redundancy;  Accompanied with powerful AMF,  AUSF, SMF, UPF together with MEC.

mSwitch 4G core

Based on the aTCA/ x86/ Cloud Deployment;  Support 5M subs;  Support 

1+ 1 Redundancy & Geographic Redundancy;  Accompanied with powerful O&M,  EPC,  MME,  P/S-GW,  EMS,  etc.

mSwitch 3G core

Based on the aTCA/ x86/ Cloud Deployment;  Support 5M subs;  Support 

1+ 1 Redundancy & Geographic Redundancy;  Accompanied with powerful CS domain,  MSC pooling,  SGSN,  GGSN,  EMS, etc.


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