Measurement Based Analysis of the Handover in a WLAN MIPv6 Scenario

Transcription

1 Measurement Based Analysis of the Handover in a WLAN MIPv6 Scenario Albert Cabellos Aparicio, René Serral-Gracià, Lorand Jakab, Jordi Domingo-Pascual Universitat Politècnica de Catalunya Departament d Arquitectura de Computadors acabello@ac.upc.edu

2 Introduction Objectives Methodology Results Conclusions Outline

3 Introduction: Motivation provides wireless connectivity to the IP provides mobility to the IPv6 jointly with provides wireless mobility to the The handover is the most critical part During this phase, the mobile node is not able to send or receive data, and some packets may be lost or delayed

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11 SCAN PHASE

12 SCAN PHASE 1.- Point found!

13 1.- Point found!

14 1.- Point found!

15 1.- Point found!

16 REGISTRATION AUTHENTICATION PHASE 1.- Point found!

17 REGISTRATION AUTHENTICATION PHASE 1.- Point found! 2.- MN connected to AP

18 1.- Point found! 2.- MN connected to AP

19 1.- Point found! 2.- MN connected to AP

20 Advertisement 1.- Point found! 2.- MN connected to AP

21 Advertisement 1.- Point found! 2.- MN connected to AP Neighbor Unreachability Detection

22 Advertisement Duplicate Address Detection 1.- Point found! 2.- MN connected to AP Neighbor Unreachability Detection

23 Advertisement Duplicate Address Detection 1.- Point found! 2.- MN connected to AP 3.- IPv6 complete Neighbor Unreachability Detection

24 1.- Point found! 2.- MN connected to AP 3.- IPv6 complete

25 1.- Point found! 2.- MN connected to AP 3.- IPv6 complete

26 Binding Update Binding Ack. 1.- Point found! 2.- MN connected to AP 3.- IPv6 complete

27 Binding Update Binding Ack. Binding Update Binding Ack. 1.- Point found! 2.- MN connected to AP 3.- IPv6 complete

28 Binding Update Binding Ack. Binding Update Binding Ack. 1.- Point found! 2.- MN connected to AP 3.- IPv6 complete 4.- Handover complete!

29 1.- Point found! 2.- MN connected to AP 3.- IPv6 complete 4.- Handover complete!

30 1.- Point found! 2.- MN connected to AP 3.- IPv6 complete 4.- Handover complete!

31 DATA 1.- Point found! 2.- MN connected to AP 3.- IPv6 complete 4.- Handover complete!

32 DATA 1.- Point found! 2.- MN connected to AP 3.- IPv6 complete 4.- Handover complete! MOVEMENT

33 DATA 1.- Point found! 2.- MN connected to AP 3.- IPv6 complete Start the whole process 4.- Handover complete! AGAIN MOVEMENT

34 Introduction Objectives Methodology Results Conclusions Outline

35 Objectives Create a structured methodology to study the handover: Passive measurements Analyze the handover latency Compare different handover layers Active measurements Packet Losses The effects of the handover on traffic sent or received by applications Apply this methodology to study the WLAN/IPv6/ in a real scenario.

36 Introduction Objectives Methodology Results Conclusions Outline

37 Handover /IPv6/MIPv6 Signaling messages Methodology: Passive Measurements Monitor Point PHM Tool Monitor Point Results MOVEMENT

38 PHM Tool Methodology: Passive Measurements Input Captured frames from both s. Currently supports: MIPv6 IPv6 Very easy to extend! FH MIPv4 IPv4

39 Methodology: Active Measurements Goal Compute the Packet Losses Compute OWD and IPDV before/after the handover Differentiate between the wireless part and the wired part How Using Active and Passive Measurements Sending a synthetic flow and capturing it on the s and on the destination Computing the (above mentioned) parameters of the synthetic flow We use NetMeter for this purpose

40 Methodology: Active Measurements

41 Methodology: Active Measurements

42 Methodology: Active Measurements Synthetic Flow (one direction)

43 Methodology: Active Measurements Monitor Point Monitor Point Synthetic Flow (one direction) Monitor Point

44 Methodology: Active Measurements Monitor Point Monitor Point Synthetic Flow (one direction) Monitor Point

45 Methodology: Active Measurements Monitor Point Monitor Point Monitor Point

46 Methodology: Active Measurements Synthetic Flow (one direction) Monitor Point Monitor Point Monitor Point

47 Methodology: Active Measurements Synthetic Flow (one direction) Monitor Point NetMeter Monitor Point Monitor Point Results

48 Methodology: Active Measurements NetMeter Provides an integrated graphical interface for a set of tools that allows the measurement Sets up the sender and the receiver Supports MGEN/MGEN6 NetPerf Supports different types of graphics Can use multiple capture points providing partial delays.

49 Methodology: Tests All the machines synchronized (1ms accuracy) 16 tests each 5 minutes long, in total 63 handovers CN MN MN CN 64Kbps UDP traffic (34 pps, 252 bytes) 1Mbps UDP traffic (94 pps, 1300 bytes)

50 Introduction Objectives Methodology Results Conclusions Outline

51 Results: Handover Latency Mean Std. Dev. Scan Authentication Association IPv Registration (HA) Registration (CN) Total Time Values in ms

52 Results: OWD and IPDV

53 Results: OWD and IPDV

54 Results: PL, OWD and IPDV Packet Loss Mean Std. Dev. 64Kbps 1Mbps 64Kbps 1Mbps MN CN CN MN OWD and IPDV OWD (ms) IPDV (ms) Before After Before After 64Kbps (VoIP) Mbps

55 Introduction Objectives Methodology Results Conclusions Outline

56 Conclusions Our analysis focuses on all levels involved in the handover process We have developed a structured methodology to study the handover process in a real scenario Our methodology is very easy to extend to other protocols Our study of the /IPv6/ shows that: The handover latency is (aprox.) 2 seconds Most of the time is spent in the IPv6 handover Packet Loss = rate x handover latency

57 Thank you! Available at PHM Tool Soon available at

58 Importance of the Medium Algorithm