What is IMS architecture?

IP Multimedia Subsystem or IMS is a standards-based architectural framework for delivering multimedia communications services such as voice, video and text messaging over IP networks.

What is an IMS core?

IMS core elements are primarily responsible for handing (routing) Session Initiation Protocol (SIP) traffic, as the signaling mechanism of choice for public communications network infrastructures. The Diameter protocol is also widely employed, within the IMS core, for policy control and billing.

What are the components of IMS?

IMS consists of three components:

  • The Database Manager (IMS DB)
  • The Transaction Manager (IMS TM)
  • A set of system services that provide common services to IMS DB and IMS TM.

What is VoLTE architecture?

The VoLTE logical architecture is based on the 3GPP defined architecture and principles for VoLTE UE, Long Term Evolution (LTE), Evolved Packet Core network (EPC), and the IMS Core Network.

What is the key objective of the IMS core network?

IMS defines a complete architecture and framework that enables the convergence of voice, video, data and mobile network technology over an IP-based infrastructure.

What are the key protocols used in IMS?

From a UE perspective IMS defines a set of protocols to be used: Session Initiation Protocol (SIP), SigComp, Real-time Transport Protocol (RTP), RTP Control Protocol (RTCP) and IP Security. Other protocol such as Diameter is involved in the IMS core but is transparent to the User Equipment.

What is IMS APN?

The IMS APN is used also for service management for VoLTE services over CS, where the IMS APN will be used also in 2G and 3G networks in addition to LTE networks. According to a first aspect, the objective is achieved by a method in a second network node in a visited communication network.

What is the IMS core architecture?

In this chapter we shall see in detail about IMS Core Architecture. A typical call will start from UE to eNB. From eNB it will go too SGW to PGW to Internet. Internet is where IMS will reside. In other words, IMS will be connected to PGW So LTE is used to facilitate VoLTE service. It will be handled by IMS network.

What is IMS VoLTE architecture?

IMS VoLTE Architecture The idea of IMS is old, but after it’s deployment with LTE users and operators can harness the true power of IMS. IMS – IP Multimedia Subsystem is a standalone system. It resides out of the LTE network and connected to PDN Gateway through SGi interface.

What is the difference between IMS core network&LTE network?

Now, We have covered User Handset & LTE Core Network. Its time to demystify IMS Core network. VoLTE Voice Call Traffic is originated by User Handset & Terminates on IMS Network. LTE Network is just used as Bridge acting as IP Supporting Carrier for this communication.

What is the most critical element of IMSI core network?

Now, I am going to discuss most critical Element of IMSI Core Network. We call this as CSCF, It stands for Call Session Control Function & act as heart of the IMS system. The CSCF performs all the signaling operations, manages SIP sessions and coordinates with other network entities for session control, service control and resource allocation.