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Get Number of Nodes in a Binary Tree

Get Number of Nodes in a Binary Tree

Question: Given a binary tree, get the total number of nodes in it. Example: Consider the image given below: Form the image above, The total number of nodes are 7. Solution: This problem can be solved by recursive traversal. Assume if you have only one node, …
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Get difference between values at Even and Odd level in a binary tree

Get difference between values at Even and Odd level in a binary tree

Question: Given a binary tree, get the difference of the sum of the nodes at odd level and sum of the nodes at even level. Example: Consider the image given below: Form the image above, The sum of nodes at odd level is 16 + 7 …
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S1 based inter eNB handover

S1 based inter eNB handover

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 interface is busy to perform HO. 2. If X2 interface is not present in between 2 eNB. …
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X2 based Handover

X2 based Handover

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 preparation Consider the image below We have 2 eNB, source eNB and Target eNB. We have MME and SGW. SGW is …
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LTE Handover Events, Measurement Reports

LTE Handover Events, Measurement Reports

In this chapter we shall learn about 1. RSRP and RSRQ 2. Handover events 3. Introduction to handover. RSRP: Reference Signal Receive Power. It is the average power of Resource Element that carry cell specific Reference Signal.   RSRQ: Reference Signal Received Quality Both of the …
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How to calculate peak data rate in LTE?

How to calculate peak data rate in LTE?

Some may say that peak data rate for LTE is 300mbps. How did they arrive at this number? In this chapter we shall make it clear. WKT: 1 frame = 10 subframe = 10ms 1 subframe = 2 slots = 0.5ms 1 slot = 12 sub …
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SIP Request and Response Headers

SIP Request and Response Headers

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 to INVITE request. BYE : It is used to terminate a SIP session. CANCEL : Terminates an INVITE request. …
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SIP Registration and Invite Call flow

SIP Registration and Invite Call flow

In this chapter we shall see SIP Registration and SIP Invite call flow.   SIP REGISTRATION Call flow: User1 SIP Server | | | REGISTER M1 | |------------------------------>| | 401 Unauthorized M2 | |<------------------------------| | REGISTER M3 | |------------------------------>| | 200 OK M4 | |<------------------------------| | …
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VoLTE IMS KPI

VoLTE KPI Index

KPI stands for Key Performance Indicators. Based on KPI values we can access the performance of a network. KPI’s are based on mathematical calculations and hence it is an important aspect for checking the quality of VoLTE service.   1. TAS KPI’s This KPI will give …
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VoLTE INVITE Call flow

VoLTE INVITE Call flow

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 Below image shows in brief of INVITE request if both UE are in same IMS Network Before UE …
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