4G LTE

In the previous chapter we saw X2 based inter eNB HO. In this chapter we shall learn S1 based HO. Scenarios where we need S1 HO. 1. If X2…

As we discussed in previous chapter, handover is based on 3 steps as below: 1. HO Preparation 2. HO Execution 3. HO Completion 1. HO…

In this chapter we shall learn about 1. RSRP and RSRQ 2. Handover events 3. Introduction to handover. RSRP: Reference Signal Receive Power. It…

Types of SIP Request INVITE : We will send INVITE request to invite a user to a call. ACK : Acknowledgment (ACK) message is sent in response…

In this chapter we shall see SIP Registration and SIP Invite call flow. SIP REGISTRATION Call flow: User1 SIP Server | | | REGISTER M1 |…

KPI stands for Key Performance Indicators. Based on KPI values we can access the performance of a network. KPI’s are based on…

In this chapter we shall look at VoLTE IMS Invite Call Flow. Below image shows in brief of INVITE request if both UE are in same IMS Network…

Basic Registration call flow is as shown in image below: Below image shows the sequence of steps followed for Registration process: First step…

In the previous chapter we had an introduction to VoLTE architecture. In this chapter we shall see in detail about IMS Core Architecture. A…

VoLTE Introduction 1. VoLTE stands for Voice Over LTE. 2. Until VoLTE was launched, all the calls made from LTE network used to go to Circuit…