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  • FAQs

    What is HSS?

    The Home Subscribe Server is the main IMS database which also acts as database in EPC. The HSS is a super HLR that combined legacy HLR and AuC functions together for CS and PS domains. In the IMS architecture, the HSS connects to application servers as...
  • FAQs

    What is MME?

    The Mobility Managemnet Entity is the main signaling node in the EPC. It is responsible for initiating paging and authentication of the mobile device. It also keeps location inforamtion at the Tracking Area level for each user and is involved in choosing...
  • FAQs

    Does LTE Support Voice Calls?

    Yes. There are a number of proposals for LTE voice. They include Circuit Switched (CS) Fallback, Single Radio Voice Call Continuity (SRVCC), and the IP Multimedia Subsystem (IMS). The key stage 2 specs that discuss these topics are 23.272 for CS Fallback...