Self Organizing Networks Based On Handover Mechanism for LTE Networks

2. What Is LTE ?

3. LTE
Performance enhancement
Not technically 4G yet

4. What Motivated LTE ?

5. LTE Evolution
WCDMA
HSDPA
HSPA+
LTE
LTE - Advanced

6. What does LTE imply ?
High Data Rate
Low Latency
Flexible Bandwidth Deployments
Seamless Mobility
QoS

7. Basic Architecture Of LTE

8. User equipment
•Mobile Termination(MT)
•Terminal Equipment(TE)
•UICC (SIM Card)

9. The e-utran(the access network)
 eNodeB or eNB
 Functions of eNB

10. Evolved packet core(EPC)

11. Uplink & Downlink

12. Self-Organizing Network

13. What is SON ?
Self-
Configurat
ion
Self-
Optimizati
on
Self-
Healing

14. Cell basics

15. Why son in lte ?
Deployment &
Maintenance
 Complex
 Time Consuming
 Expensive

16. Basic procedure between UE & eNB

17. Flow Of Attachment between ue & eNB

18. Actual Connection Procedure

19. What are S1 & X2 ?

20. S1 Setup
•Interface
•Separate
E-UTRAN
& EPC

21. X2 Setup
 Interfaces
between
eNBs

22. Handover

23. What is Handover ?
 Definition
 Core Element

24. Why Handover ?
 Mobility
 User Preferences

25. Objective of handover
 QoS
 UE battery
 Normal service
 Seamless handoff

26. Types of handover
Network Controlled
• Network
Mobile Evaluated
• UE

27. LTE Handover
Network
Controlled
Mobile
Evaluated
LTE
Handover

28. Types of handover in lte
Intra-LTE
Handover
• Source Cell
• Target Cell
• Same LTE
network
Inter-LTE
Handover
• Other LTE nodes
• Inter-MME &
Inter-SGW
Inter-RAT
• Different
technologies
• Example: LTE to
WCDMA

29. Intra-LTE Handovers
Intra-LTE
Handover
TOO Early HO
Too Late HO
Ping Pong HO

30. Pre-Requisites

31. Handover in LTE

32. HO
Process
Phases
1.Preparation
2.Execution3.Completion

33. Preparation Phase

34. Execution Phase

35. Completion Phase

36. How to optimize handover in lte using son ?
SON feature
Self-
Optimization
Minimize HO
failure rate

37. Ways of optimizing Ho in LTE
Eventa3
A3offset Hysteresis
Time-To-
Trigger

39. Methodology to avoid HO failure
 Hata Path Loss Model
 XSOM Algorithm

40. Yes
Yes
START
Create LTE Network Topology
Set value of Hysteresisa3 to 4dB
Set TTT: 480ms, 320ms, 256ms,
160 ms, 80ms and 40ms
Good HO
Optimization?
Set value of Time-To-Trigger
to 320ms
Set Hysteresisa3: 0.5dB, 1dB,
dB, 3dB, 4dB and 5dB2
Good HO
Optimization?
Observed and analysed result
obtained from each simulation
END
No
No
Fig 1: HO Optimization Algorithm.
Handover algorithm

41. eNB1 eNB2
R
5
R
4
R
3
R
2
R
1

42. Simulation Results
 Network throughput
 Delay

43. Thank you!!!