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Submission

Wi-Fi Alliance (WFA) VHT Study GroupUsage Models

Date: 2007-11-08

Name Affiliations Address Phone email

Wi-Fi Alliance

Authors:

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Submission

Abstract

While the listed contributors provided actual text to this submission, the submission embodies the results of discussions taken place in the Wi-Fi Alliance (WFA) Very High Throughput Study Group. This document is a formal liaison from the WFA and has been approved by the WFA Board of Directors as such. The document contains usage model information intended to help guide the technical requirements leading to a PAR and 5 Criteria of the Task Group that will result from the IEEE 802.11 VHT SG.

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Submission

Topics of the presentation

• Context and Introduction• Categories of Usage Models• Terminology• VHT Environments• Listing of Usage Models by Category• Examples of Usage Model Definition Formats• Next Steps

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Submission

Context and Introduction• As a result of the July, 2007 meeting in San Francisco, the

IEEE802.11 Working Group Approved a Liaison to WFA requesting Usage Models to drive requirements for the VHT SG

• The WFA responded by creating a Study Group chartered with producing Usage Models for VHT

• This group has held 6 conference calls, and one face to face meeting (1 hour session in Singapore)

• This Usage Model document is only an interim version, the final version will be available in time for the 802.11 WG meeting in Taiwan in Jan 08 and the WFA reserves the right to significantly modify the document between now and Jan 08.

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Submission

Progress to Date

• The WFA VHT group has defined:– 29 usage models– 6 Categories of usage models– 7 Types of Environments

• The group has converged on a documentation template for the usage models; examples for 3 usage models are included in this presentation

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Submission

Categories of Usage Models*

1. Wireless Docking2. In Home Distribution of HDTV and other content3. Rapid Upload and Download of large files to/from

server4. Backhaul Traffic (e.g. for Meshing, Enterprise,

Small Office)5. Campus / Auditorium deployments6. Manufacturing Floor Automation

* To be finalized during the upcoming WFA VHT conference calls

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Submission

Terminology • Usage Model – A usage model is the combination of all the below things; not

to be confused with a use case which is the specific set of steps to accomplish a particular task. – Pre-Conditions – Initial conditions before the use case begins.– Application – A source and/or sink of wireless data that relates to a particular type

of user activity. Examples are streaming video and VoIP.– Environment – The type of place in which a network is deployed, such as home,

outdoor, hot spot, enterprise, metropolitan area, etc.– Traffic Conditions – General background traffic or interference that is expected

while the use case steps are occurring. Overlapping BSSs, existing video streams, and interference from cordless phones are all examples of traffic conditions.

– Use case – A use case is task oriented. It describes the specific step by step actions performed by a user or device. One use case example is a user starting and stopping a video stream.

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Submission

VHT Environments• Home– On desk (short range, line of sight)– Within room (medium range, mostly line of sight)– Entire home (long range, could be no line of sight)– Home Mesh

• Enterprise– On desk/cube (short range, line of sight)– Conference room (medium range, mostly line of sight)– Dense deployment – Enterprise Mesh

• Small Office – Single BSS with unmanageable interferences with limited number of users

• Outdoor– outdoor mesh backhaul link– regular bridging between buildings– Airplane docking

• Campus (Education Space, Hospital)– auditorium/lecture halls in the education space for video demos – Video surveillance and conferencing– Hospitals where Remote Medical Assistance for Operations is via Wireless Networks

• Airplane/Bus/Train/Ship – Intra-large-vehicle communication. Large vehicle being airplane, bus, train or ship• Factory floor

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Submission

Category 1: Wireless Docking

• Desktop Storage & Display at home or enterprise• In room projection to TV at home or projector in conference

room within an enterprise• Gaming – video display from game machine and peer-to-peer

connectivity for hand-held controllers• Streaming from a camcorder to a display (live or stored

content)• Broadcast TV Field Pick Up• Medical Imaging and Surgical Procedure Support in the form

of uncompressed video

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Submission

Category 2: Distribution of HDTV and other content

• Lightly or uncompressed video streaming in a room at home (uncompressed HDTV quality is ~1.5Gbps, large monitor uncompressed can be up to 10Gbps)

• Lightly compressed video streaming around the entire home (100s of Mbps)

• Compressed video streaming in a room or throughout a home• Intra-Large-Vehicle (e.g. airplane) Applications

– Video streaming of 30-40 movies, 100s of TV channels to up to 300 people with individual play/rewind control over each stream

– Streams are ~5Mbps each. 300*5Mbps=1.5Gbps• Wireless Networking for Small Office• Remote Medical Assistance via Wireless Networks

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Submission

Category 3: Rapid Upload and Download of large files to/from server

• Rapid Sync-n-Go file transfer – camera to PC (10s of MB per pic), video kiosk

• Picture-by-picture viewing - displaying digital pictures (jpegs, raw files) from a remote storage device to laptop or TV

• Airplane docking – as airplane pulls up to the boarding gate:– plane down loads sensor (mechanic info, flight performance, maintenance) & flight information (e.g. crew,

passenger info, flight plan)– plane uploads next flight information and new videos

• Movie Content Download to Car as it pulls into garage• Police / Surveillance Car Upload

– Upload several 10s of GB of data (Video Surveillance footage) from surveillance car to content server police station

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Category 4: Backhaul • Mesh Backhaul Accommodating Movie/Video

Downloads/Uploads• High-speed building to building bridging • High-speed mesh backhaul• Enterprise backhaul• Backhaul for Small Office Mesh• Backhaul from the hot spots

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Submission

Category 5: Outdoor Campus / Auditorium deployments

• Video Demos or Tele-presence in Auditoriums/Lecture Halls

• Public Safety Mesh• Campus-wide and municipal deployments

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Submission

Category 6: Manufacturing Floor Automation

• Factory floor within large metallic buildings, with large numbers of different, moderate high capacity data links (e.g. for ERP systems, web access, handheld / pda internet access, software downloads, productivity applications, machine to machine communication, full motion video on CAD systems, VOIP calling, etc.)

• Large Manufacturing Floor deployments with machinery requiring large CAD / CAM file uploads

• Machine to machine communication (e.g. laser alignment)

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Submission

Examples of Usage Model Write Ups

• The planned deliverable for the January meeting will have write ups for all usage models

• This presentation contains write ups of 3 sample usage models from different use case categories

• These sample use cases are:– Lightly Compressed Video Streaming throughout the home

• Category 2 (Distribution of HDTV and other content)

– Telepresence in Auditoriums / Lecture Halls• Category 5 (Campus / Auditorium Deployments)

– Machine to Machine Communication• Category 6 (Manufacturing Floor Automation)

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Submission 16

Usage Model: Lightly Compressed Video Streaming throughout the home (Category2*)

Traffic Conditions: Occasional interference from other homes because WLAN is on other channels. Data transfers consuming up to 20% of the total bandwidth, 2 additional video streams, and wireless display/controllers from a video game machine may be occurring during this use case. Microwave may be running for up to 5 minutes.Use Case:1.User looks up a program on electronic program guide.2.User selects a video. 3.Lightly Quality Compressed Video (e.g. ~100Mbps) is delivered/uploaded over the wireless network for a period of two hours. 4.User may pause video during 2 hour period then resume watching.5.Task is complete when user stops watching the video.

Pre-Conditions: User has operational WLAN network. A TV with wireless capabilities, a PVR with wireless capabilities, and an AP associated with the WLAN that is not in the same room as the game machine and TV. Application: User can display the output of the PVR wirelessly on the TV. The video being displayed is lightly compressed at a rate of ~100Mbps, jitter is <1 msec, delay is < 1msec, 10-5 PER.

Environment: Two story, three bedroom house with an AP in one corner in the den. Other homes in the area are also operating WLANs. Transmissions are mostly Non-LOS. Distance between far corners of the home are ~100 feet with as many as 8 walls (and one floor) between the video end points.

* Category 2: Distribution of HDTV and other Content

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Submission

Category 2: Lightly Compressed Video Streaming throughout the home

TV

TVTV

TV

DVR

DVR

PC

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Submission 18

Usage Model: Tele-presence in Auditoriums/Lecture Halls (Category 5*)

Traffic Conditions: High-Def video for a very large stage screen. As many as five audio streams to accommodate multiple languages, each stream is high-def audio. QoS must be ensured within application requirements. Interference or bandwidth contention may come from laptops or cells phones within the auditorium accessing the Internet with as much as 20% available bandwidth being allocated to such devices..Use Case:1. Video sessions are set up “off-line”.2. The event goes live for e.g. 2 hours.3. Live translation to multiple languages then transmission of the audio. 4. Possible some audience questions or interactivity.5. Sessions are terminated.

Pre-Conditions: A WLAN networks is operational in a auditorium or lecture hall (300’x300’) is used for mass “tele-presence” or interactive demo events. Auditorium/lecture hall is connected remotely to through high speed link to the actual person/people doing the presentation. Actual person may be many miles away from lecture hall with telepresence.Application: Tele-presence conferencing event that involves audio and video. Audio is transmitted in several languages to accommodate a diverse audience. Audience may moderately interact with the presenter.Video stream is ~50Mbps. Jitter <50msec. Delay <50msec. 10% PER.Each Audio stream ~500Kbps. Jitter <10msec. Delay <10msec. 10% PER.Audio and video must be synchronized.Environment: Mostly open indoor space of ~300’x300’. Mostly LOS with a few obstacles such as partitions and people. Max distance between end-points ~200 yards. * Category 5: Campus / Auditorium Deployments

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Submission 19

Usage Model: Machine to Machine Communication (Category 6*)

Traffic Conditions: Hundreds or thousands of independent links and data streams with varying QoS, reliability, and throughput, requirements. Aggregate data flows range into Gbps requirements.

Use Case:1. Multiple systems in factory; starting, stopping, and flowing network traffic in a largely asynchronous environment.2. Some data flows have significant integrity requirements (large material-handling machines; cranes, crawlers, etc.)3. Some data flows have significant QoS requirements (VoIP, Video streams, etc.)4. Factory is VERY electrically noisy; spark-gap noise (electric motors, etc.), microwave ovens, other technologies (RFID, RTLS, etc.), and competing 802.x wireless systems.

Pre-Conditions: A WLAN is operational in manufacturing space that has hundreds to thousands of individual tasks happening each minute. Many of these tasks require communications. Application: All types of information required to run large manufacturing floor. Large variances in data transfer size, time sensitivity, and reliability exist. Here are some examples:• Streaming of live or CAD video requires high throughput, time sensitive, and reliable transfers.• VoIP requires low bandwidth and time sensitive transfers; reliability is less of a concern.• Machine-machine communications, robotic material handling requires high reliability but is less time sensitive.• Data loading machines is high bandwidth but low in time sensitivity. Application layer protocols would ensure reliability.Environment: Within large metallic building. High reverberation, long propagation distances (10’s~100’s meters), long delay spreads. Constantly moving equipment changing RF propagation channel model. * Category 6: Manufacturing Floor Automation

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Submission

Next Steps

• WFA VHT Group would like to receive feedback from the IEEE VHT SG members regarding:– Completeness of the list of Usage Model Categories– Completeness of the list of Usage Models– Format for documenting the Use Models

• WFA VHT Group to create final version of the Usage Model document for WFA BoD approval and submission at the January IEEE meeting