1. November 2000 Jin-Meng Ho, Texas InstrumentsSlide 1 doc.: IEEE 802.11-00/363 Submission Traffic Descriptions For 802.11E Performance Simulation Jin-Meng Ho Texas Instruments Incorporated 12500 TI Blvd. Dallas, Texas 75243 (214) 480-1994 jinmengho@ti.com

2. November 2000 Jin-Meng Ho, Texas InstrumentsSlide 2 doc.: IEEE 802.11-00/363 Submission Objectives Serves as a starting common simulation scenario for evaluation of 802.11e QoS MAC proposals. Provides more details of the simulation scenario outlined as Model 3 in doc 196r2 for 11 Mbps home environments. Generates other simulation scenarios that are applicable to other PHY rates and operation environments.

3. November 2000 Jin-Meng Ho, Texas InstrumentsSlide 3 doc.: IEEE 802.11-00/363 Submission Outline Topology of traffic categories Models of traffic sources – Voice – Video Conferencing – MPEG2 – Data Web Requests, Web Objects File Transfers, Image Transfers Emails

4. November 2000 Jin-Meng Ho, Texas InstrumentsSlide 4 doc.: IEEE 802.11-00/363 Submission AP/PC STA5 VC (Video Conferencing) STA4 STA3 STA1STA2 Voice Web_Requests (LP) Web_Objects (LP) Web Requests (HP) Web Objects (HP) File Transfers (MP) Image Transfers (MP) Outgoing Emails (BE) Incoming_Emails (BE) Simulation Scenario for 802.11B (11 Mbps Home Environments) MPEG2 Voice Priority levels: BE = 0 LP = 1 MP = 2 HP = 3 MPEG2 = 4 VC = 5 Voice = 6 R = 7 E-DCF mappings: BE = 0 LP = 1 MP = 1 HP = 2 MPEG2 = 2 VC = 3 Voice = 3 R = 3 Data (dotted) links may be idle most of the time.

5. November 2000 Jin-Meng Ho, Texas InstrumentsSlide 5 doc.: IEEE 802.11-00/363 Submission Total Traffic Source Rates - Average individual rates: --controls rate proportions among data links --controls aggregate data traffic rate Data Traffic (Webs + Emails + File/Image Transfers) - Average aggregate rate: Total Traffic - Average aggregate rate: Without MPEG2 loading With MPEG2 loading

6. November 2000 Jin-Meng Ho, Texas InstrumentsSlide 6 doc.: IEEE 802.11-00/363 Submission Some Heavy-Tailed Distributions Lognormal (): Pareto ():

7. November 2000 Jin-Meng Ho, Texas InstrumentsSlide 7 doc.: IEEE 802.11-00/363 Submission More Heavy-Tailed Distributions Weibull (): Gamma ():

8. November 2000 Jin-Meng Ho, Texas InstrumentsSlide 8 doc.: IEEE 802.11-00/363 Submission Voice Traffic Models Birectional Source rate (in each direction) = 64 kb/s (CBR) Inter-packet arrival time (to LLC) = 20 ms Higher layer and WEP overhead (per MSDU) = 48 bytes Net frame (MSDU) length = 208 bytes

9. November 2000 Jin-Meng Ho, Texas InstrumentsSlide 9 doc.: IEEE 802.11-00/363 Submission Video Conferencing Traffic Models (From Doc 349) Birectional Source rate (in each direction) = 98.4 kb/s (CBR) Packet arrival rate (to LLC) = 20 packets/s Higher layer and WEP overhead (per MSDU) = 48 bytes Net frame (MSDU) length = 663 bytes

10. November 2000 Jin-Meng Ho, Texas InstrumentsSlide 10 doc.: IEEE 802.11-00/363 Submission MPEG2 Traffic Models (From Doc 349) Unidirectional Average source rate = 5.12 Mb/s (VBR) Modeled by scenes, GOPs (group of pictures), and I/B/P frames Higher layer overhead (per MSDU) = 40 bytes Inter-frame arrival time (to LLC) = 33.33 ms Frame length distributions (in bits): IBBPBBPBBPBBPBBI GOP = 15 Frames = 0.5 secs BBPBBPBBPBBPBBI

11. November 2000 Jin-Meng Ho, Texas InstrumentsSlide 11 doc.: IEEE 802.11-00/363 Submission Data Traffic Models (Emails, Web Requests/Objects, File/Image Transfers) Modeled by (hierarchical) renewal processes per-direction Arrivals to LLC in bursts (which may be decomposed into frames) Higher layer overhead included (absorbed) in models Delay and jitter evaluated with respect to bursts, but not frames λ (needed later) given on slide 5 under various channel loads

12. November 2000 Jin-Meng Ho, Texas InstrumentsSlide 12 doc.: IEEE 802.11-00/363 Submission Email Traffic Models Outgoing Emails: Incoming Emails:

13. November 2000 Jin-Meng Ho, Texas InstrumentsSlide 13 doc.: IEEE 802.11-00/363 Submission File/Image Traffic Models File Transfers: Image Transfers:

14. November 2000 Jin-Meng Ho, Texas InstrumentsSlide 14 doc.: IEEE 802.11-00/363 Submission Web Traffic Models Web Requests (LP): Web Objects (LP):

15. November 2000 Jin-Meng Ho, Texas InstrumentsSlide 15 doc.: IEEE 802.11-00/363 Submission Web Traffic Models (Cont) Web Requests (HP): Web Objects (HP):

16. November 2000 Jin-Meng Ho, Texas InstrumentsSlide 16 doc.: IEEE 802.11-00/363 Submission Delay and Delay Variation Evaluation Each burst of data arrivals (as illustrated by arrows and characterized by RVs and in the previous slides) represents a “message”, such as a user request, an web object, and an embedded web reference. A message is “meaningful” to the user only after the complete burst of data arrivals has been received. Delay and delay variation should be evaluated with respect to messages, instead of “frames” into which messages may decompose.