doc.: ieee 802.11-13/1406r0 submission nov 2013 huai-rong shao, et al. (samsung)slide 1 traffic...

doc.: IEEE 802.11-13/1406r0

Submission

Nov 2013

Huai-Rong Shao, et al. (Samsung)Slide 1

Traffic Modeling for HEW Simulation

Date: 2013-11-12

Name Affiliations Address Phone email

Huai-Rong Shao Samsung [email protected]

Chiu Ngo Samsung [email protected]

SangHyun Chang Samsung [email protected]

Hyunjeong Kang Samsung [email protected]

Guoqing Li Intel [email protected]

Saishankar Nandagopalan

Adeptence Inc [email protected]

Yonggang Fang ZTETX [email protected]

Bo Sun ZTE [email protected]

Kaiying Lv ZTE [email protected]

Chaochun Wang MediaTek [email protected]

Authors:

doc.: IEEE 802.11-13/1406r0

Submission Slide 2

Motivation

• HEW group tries to improve performance such as efficiency and QOE for the real world scenario

• Traffic modeling becomes very important to simulate the real use scenarios

Nov 2013

Huai-Rong Shao, et.al. (Samsung)

doc.: IEEE 802.11-13/1406r0

Submission Huai-Rong Shao, et.al. (Samsung)

Traffic Modeling Framework • Two levels for simulation:

• Level one– Application Traffic Modeling [2,3]

• Specify the traffic characteristics of an application• E.g., Local file transfer, HTTP web browsing, Lightly Compressed video, Online

gaming, etc.

• Level two– STA Application Profiles [4]

– Mixing of applications at STAs – E.g., STA 1 has a profile of video streaming + web browsing, and STA 2 has a

profile of video conferencing + ftp

• Profile Configuration (Addressed by this presentation) – Pattern of the application events, i.e., when to start the applications in the

simulation and how long for each application– E.g., for a STA, video streaming application starts at time 0 and web browsing

starts at time 8

Nov 2013

Slide 3

doc.: IEEE 802.11-13/1406r0


Example 1: TCP Traffic Configuration

• TCP configuration for file transfer [2]

• Widely used by different simulators

Nov 2013

Slide 4

TCP Configuration Parameters in SimulatorsMSS Ethernet (1500 bytes)

Receive Buffer (Bytes) 65535

Receive Buffer Adjustment None

Delayed ACK Mechanism Segment/Clock based

Max. ACK Delay (Sec) 0.05

Slow Start Initial Count (MSS) 1

Fast Retransmit Enabled

Duplicate ACK Threshold 3

Fast Recovery Reno

Window Scaling Enabled

Selective ACK (SACK) Disabled

ECN Capability Disabled

Segment Send Threshold Byte Boundary

Active Connection Threshold Unlimited

Karn’s Algorithm Enabled

Nagle Algorithm Disabled

Initial Sequence Number Auto Complete

Initial RTO (sec) 3.0

Min RTO (sec) 1.0

Max RTO (sec) 64

RTT Gain 0.125

Deviation Gain 0.25

RTT Deviation Coefficient 4.0

Timer Granularity 0.25

doc.: IEEE 802.11-13/1406r0

Submission

Nov 2013

Huai-Rong Shao, et.al (Samsung)Slide 5

Example 2: HTTP Traffic Modeling

• The parameters of HTTP file transfer in [2]:– SM: Size of main object in page– Nd: Number of embedded objects

in a page– SE: Size of an embedded object in

page– Dpc: Reading time– Tp: Parsing time for the main page

• The table on the right highlights the components and their distributions– Approximate mean data rate of

(10KB+48KB)/31 = 12.31 kbps

Component Distribution Parameters PDF

Main object size (SM)

Truncated Lognormal

Mean = 10710 bytes SD = 25032 bytes Min = 100 bytes Max = 2 Mbytes (before truncation)

21 lnexp , 0

22 2

xf xx

x

37.8,37.1

if x>max or x<min, discard and generate a new value for x

Embedded object size (SE)

Truncated Lognormal

Mean = 7758 bytes SD = 126168 bytes Min = 50 bytes Max = 2 Mbytes (before truncation)

21 lnexp , 0

22 2

xf xx

x

17.6,36.2

f x>max or x<min, discard and generate a new value for x

Number of embedded objects per page (Nd)

Truncated Pareto

Mean = 5.64 Max. = 53 (before truncation)

,1

,

k k x mf xx

kx mf x

m

1.1, 2, 55k m

Subtract k from the generated random value to obtain Nd if x>max, discard and regenerate a new value for x

Reading time (Dpc)

Exponential Mean = 30 sec

, 0x

xf ex

= 0.033

Parsing time (Tp)

Exponential Mean = 0.13 sec

0,

xex

f x

69.7

doc.: IEEE 802.11-13/1406r0

Submission

Nov 2013


Modeling for Various Video Traffic Types

• [3] provides models for – Wireless Display: lightly compressed video– Buffered video streaming– Video conferencing

• Details discussed during this week

doc.: IEEE 802.11-13/1406r0


Application Event Modeling

• How to simulate the event timing of individual application traffic for all STAs to simulate real world scenario– When to generate which traffic types– Duration of the applications, etc.

• Different use scenarios may need different application event models – Classroom, Home, Railway station, Stadium, etc.– Some may completely random and some may have peak patterns

Nov 2013

Slide 7

doc.: IEEE 802.11-13/1406r0


Application Event Patterns

• Most popular pattern is Random pattern– A Random pattern occurs where there are many

users, each generating a little bit of traffic and requesting network access randomly

– Currently Poisson model is widely used• VoIP calls from Cisco measurement [5]• User accesses to Web Pages [6]

• The second pattern is Peaked pattern– A peaked pattern has big spikes from the mean

• Some use scenarios like training arrival, class starting may go to this pattern

– Hyper-exponential model can be used• VoIP calls from Cisco measurement [5]

Nov 2013

Slide 8

Time

Application requests

Application requests

Time

Time

doc.: IEEE 802.11-13/1406r0

Submission

Summary• HEW simulation needs both application traffic models

and application profiling/configuration models– We have various applications traffic models [2,3] proposed

• More traffic types may be added in the future– Application profiling/configuration

• Based on [4], add application event models

• Propose to add application event models to Simulation Scenario document (802.11-13/1001)

• Poisson model and Hyper-exponential model

Nov 2013


doc.: IEEE 802.11-13/1406r0

Submission

Reference

[1] “HEW SG Simulation Scenarios”, IEEE 802.11-13/1001r4, Simone Merlin, etc.

[2] “Internet Traffic Modeling”, IEEE 802.11-09/1317r1, Sai Nandagopalan, etc.

[3] “Video Traffic Modeling”, IEEE 802.11-13/1305r0, Guoqing Li, etc.

[4] “Simplification of HEW Traffic Model Simulations”, IEEE 802.11-13/0847r1, William Carney, etc.

[5] “Traffic Analysis for Voice over IP”, http://www.cisco.com/en/US/docs/ios/solutions_docs/voip_solutions/TA_ISD.html#wp1030552

[6] “A Poisson Model for User Accesses to Web Pages”, Computer and Information Sciences -- ISCIS 2003, Sule Gunduz, etc.

Slide 10

Nov 2013

Huai-Rong Shao, et.al. (Samsung)

doc.: IEEE 802.11-13/1406r0


Thank you!

Nov 2013

Slide 11

doc.: ieee 802.11-13/1406r0 submission nov 2013 huai-rong shao, et al. (samsung)slide 1 traffic...

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