Network Mobility Management: APPLICATION REQUIREMENTS & MOBILITY MODELS

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Stephen Gilmore
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1 Network Mobility Management: APPLICATION REQUIREMENTS & MOBILITY MODELS h"p:// Mobile Systems Prof. Marco Di Felice Department of Computer Science and Engineering University of Bologna

2 q To evaluate the impact of handover opera;ons in mobile environments, two aspects should be taken into account: ² Applica'on model à characteris;cs and requirements of the applica;ons running over the mobile device. ² Mobility model à how the mobile device moves within the scenario, and how to model the mobility pa"ern. 2

3 q The Internet traffic is generated by applica;ons characterized by different characteris;cs and requirements in terms of expected Quality of Service (QoS). TAXONOMY of the INTERNET APPLICATIONS REAL-TIME NON REAL-TIME VoIP, VideoConf IM, Chat, etc Audio/Video on Demand Web, , etc Yan Chen, Toni Farley and Nong Ye, QoS Requirements of Network Applica;ons on the Internet, Systems Management 4 (2004), pp SYMMETRIC ASYMMETRIC 3

q Non-real 'me applica'ons generate traffic that is considered as best effort.

² Traffic is managed on a first-come, first-served basis.

traffic: equivalent resource consump;on at each host endpoint of the

4 q Non-real 'me applica'ons generate traffic that is considered as best effort. ² Do not involve specific QoS requirements. ² Traffic is managed on a first-come, first-served basis. ² Asymmetric traffic (mostly common): Web traffic, FTP, , ² Symmetric traffic: equivalent resource consump;on at each host endpoint of the communica;on link (e.g. IMS). Yan Chen, Toni Farley and Nong Ye, QoS Requirements of Network Applica;ons on the Internet, Systems Management 4 (2004), pp

² Real-'me applica'ons pose Quality of Service (QoS)

² Soi real-;me vs Hard real-;me applica;ons.

ondemand, etc ² Symmetric applica;ons include those

Videoconferencing Yan Chen, Toni Farley and Nong Ye, QoS

5 ² Real-'me applica'ons pose Quality of Service (QoS) requirements, that involve network support. ² Soi real-;me vs Hard real-;me applica;ons. ² Asymmetric traffic: audio/video streaming, audo/video ondemand, etc ² Symmetric applica;ons include those which are conversa;onal in nature: Voice Over IP (VoIP), Videoconferencing Yan Chen, Toni Farley and Nong Ye, QoS Requirements of Network Applica;ons on the Internet, Systems Management 4 (2004), pp

6 ² Throughput: rate of successful message delivery over a communica;on channel (measured in B/s). throughput(b / s) = Byte_ received Time_unit ² Average Delay: latency required to deliver a message, from the source node to the des;na;on node Average_ Delay(s) = E[Time_ send Time_ recv] 6

7 ² Packet Loss Rate: rate of messages which are not delivered to the des;na;on (loss events due to conges;on, conten;on) Loss _ Rate =1 Num _ pkt _ received Num _ pkt _ sent ² JiLer: varia;on in packet latency, due to impact of network dynamics (e.g. path conges;on, mul;-path). Average_ Delay(s) = Var[Time_ send Time_ recv] 7

Requirements & Models ² Peak Signal to Noise Ra'o: ra;o between the maximum power of a signal and the power of corrup;ng noise that aﬀects the ﬁdelity of

8 Requirements & Models ² Peak Signal to Noise Ra'o: ra;o between the maximum power of a signal and the power of corrup;ng noise that aﬀects the ﬁdelity of its representa;on. q Computed in logarithmic decibel scale. COMPRESSED FILE, PSNR 31.45dB ORIGINAL FILE h"ps://en.wikipedia.org/wiki/peak_signal-to-noise_ra;o 8

9 ² Quality of Experience (QoE) q User-focused performance metric of a service, based on the factors that can have an impact on the human interac;on. Yan Chen, Toni Farley and Nong Ye, QoS Requirements of Network Applica;ons on the Internet, Systems Management 4 (2004), pp

10 ² Example of QoS specifica'on q List of requirements for audio-conferencing applica;ons Yan Chen, Toni Farley and Nong Ye, QoS Requirements of Network Applica;ons on the Internet, Systems Management 4 (2004), pp

Wireless Mul*hop Ad Hoc Networks

Wireless Mul*hop Ad Hoc Networks Wireless Mul*hop Guevara Noubir noubir@ccs.neu.edu Some slides are from Nitin Vaidya s tutorial. Infrastructure vs. Ad Hoc Wireless Networks Infrastructure networks: One or several Access- Points (AP)