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IEEE TGac usage models – Preliminary stages

IEEE TGac usage models – Preliminary stages. Authors:. Date: 2009-01-21. Abstract. This submission aims to describe and to recall some definitions and preliminary stages aiming to prepare the completion of the usage models. Contents. Context and Introduction Some definitions

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IEEE TGac usage models – Preliminary stages

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  1. IEEE TGac usage models – Preliminary stages Authors: Date: 2009-01-21 P. Chambelin, Thomson R&D France

  2. Abstract This submission aims to describe and to recall some definitions and preliminary stages aiming to prepare the completion of the usage models. P. Chambelin, Thomson R&D France

  3. Contents • Context and Introduction • Some definitions • Process to complete the usage models • Definition of parameters • Definitions of environments • Conclusions P. Chambelin, Thomson R&D France

  4. Some definitions from TGn group • Application – a source or sink of wireless data that relates to a particular type of user activity. • Examples: Streaming video. VOIP. • Environment – The type of place a WLAN system is deployed in. Initial examples: home, large office. • Use case – A use case is a description of how an end user uses a system that exercises that system’s deployment of WLAN. A use case includes an application in a deployment environment with details regarding the user activity and both sides of the link. • Examples: Watching television remote from the cable or set-top box within the home. Talking on the telephone remote from one’s desk at work. • Usage Model – A specification of one or more applications and environments from which a simulation scenario can be created once the traffic patterns of the applications are known. Usage models are created to "cover" use cases. Source : doc.: IEEE 802.11-03/802r23 IEEE P802.11 Wireless LANs Usage Models P. Chambelin, Thomson R&D France

  5. Some definitions from WFA • 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. Source : doc.: IEEE 802.11-07/2988r2, March 08, Wi-Fi Alliance (WFA) VHT Study Group Usage Models P. Chambelin, Thomson R&D France

  6. Comparison between TGn and WFA definitions • WFA added : • Pre- conditions • Traffic conditions • TGn’s definitions allowing to specify • The state of the network before describing the use case • What is available for the user for the use case • What are the other applications working in vicinity and able to interfere and coexist. • However WFA did not defined the parameters • some requirements for the network are exposed, but the parameters are not specified ! • WFA it does not associate environment with channel model P. Chambelin, Thomson R&D France

  7. Channel Models Usage Models Functional Requirements* Process to complete the usage models • Based on IEEE 802.11-08/1392r0 , Inputs for a VHT Selection Procedure P. Chambelin, Thomson R&D France

  8. Process to complete the usage models • How to define Usage Models ? • A usage model is related to : • A specific environment: • and then a channel model for each frequency band (difference from 11.n Usage models). • Maybe new channel models including elevation plan, wider channel bandwidth, antenna parameters ? • And then a network condition with traffic conditions for each frequency band • Multi environment for a usage model is not allowed / the reality. Isn’t it ? • One or several applications, describe by use cases (scenario of the applications), could be a mix of <6 GHz use case and 60 GHz use case. • Specifying the requirements for the applications and for the related parameters. • A usage model should be able : • To create a simulation scenario P. Chambelin, Thomson R&D France

  9. Usage model Environment 1: Channel Model(s) Network state and traffic conditions Appli 1 Appli 2 Appli N Application requirements Application requirements Application requirements Functional requirements : - payload data rate - BER or PER - latency / packet delay - QoS , prioritization - … Process to complete the usage models: proposal P. Chambelin, Thomson R&D France

  10. Definition of parameters from TGn Source : doc.: IEEE 802.11-03/802r23 IEEE P802.11 Wireless LANs Usage Models P. Chambelin, Thomson R&D France

  11. Definition of environments from TGn Source : doc.: IEEE 802.11-03/802r23 IEEE P802.11 Wireless LANs Usage Models P. Chambelin, Thomson R&D France

  12. Definition of environments from TGn Source : doc.: IEEE 802.11-03/802r23 IEEE P802.11 Wireless LANs Usage Models P. Chambelin, Thomson R&D France

  13. Definition of environments from WFA Source : doc.: IEEE 802.11-07/2988r2, March 08, Wi-Fi Alliance (WFA) VHT Study Group Usage Models • 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 P. Chambelin, Thomson R&D France

  14. Definition of environments Proposal • No full redundancy between TGn and WFA Definition of environments • 9 main environments in TGn • 7 main environments in WFA • Hotspots are not considered • Mobility (train, plane, car) is not considered • WFA seems to provide an up to date view of environments except that Hot spot is missing. • Proposal : Keep WFA environments and add Hot spot P. Chambelin, Thomson R&D France

  15. Conclusions • The following steps are proposed to be able to specify the Usage Models and to describe the functional requirements. • Keep the environments defined by WFA • Keep the usage models proposed by WFA, and check if the group need more usage models Then how to define the relevant parameters and requirements ? • List all relevant applications by environment, and describe the associated requirements. • An application defined in a specific environment allows to specify the relative Channel Model. • Define the parameters for the functional requirements • and finally describe the functional requirements and parameters for each usage models. P. Chambelin, Thomson R&D France

  16. References • IEEE 802.11-03/802r23 IEEE P802.11 Wireless LANs Usage Models • IEEE 802.11-07/2988r2, March 08, Wi-Fi Alliance (WFA) VHT Study Group Usage Models P. Chambelin, Thomson R&D France

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