IEEE TGac usage models – Preliminary stages Month Year doc.: IEEE 802.11-yy/xxxxr0 January 2009 IEEE TGac usage models – Preliminary stages Date: 2009-01-21 Authors: P. Chambelin, Thomson R&D France John Doe, Some Company

Month Year doc.: IEEE 802.11-yy/xxxxr0 January 2009 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 John Doe, Some Company

Contents Context and Introduction Some definitions January 2009 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

Some definitions from TGn group January 2009 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

Some definitions from WFA January 2009 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

Comparison between TGn and WFA definitions January 2009 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

Process to complete the usage models January 2009 Process to complete the usage models Based on IEEE 802.11-08/1392r0 , Inputs for a VHT Selection Procedure Usage Models Channel Models Functional Requirements* P. Chambelin, Thomson R&D France

Process to complete the usage models January 2009 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

Process to complete the usage models: proposal January 2009 Process to complete the usage models: proposal 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 - … P. Chambelin, Thomson R&D France

Definition of parameters from TGn January 2009 Definition of parameters from TGn Source : doc.: IEEE 802.11-03/802r23 IEEE P802.11 Wireless LANs Usage Models Parameter Definition MSDU size Packet size at the top of the MAC Maximum PLR Maximum packet loss rate at the top of the MAC. This is defined by the loss rate that can be tolerated by the application. Maximum Delay Maximum transport delay at the top of the MAC – i.e. between matching MA-UNITDATA.request and .indication. Protocol Indicates the network-layer protocol running between the data source and the MAC. It takes one of two values: TCP or UDP. These two protocols are intended to represent a generic acknowledged and a generic unacknowledged network-layer protocol. Offered Load This parameter is interpreted differently according to the Protocol parameter: Applications identified as being carried by UDP are assumed to generate MSDUs at a fixed rate, as identified in the "Offered load" column. Inability to carry the traffic generated by a UDP application, due to insufficient throughput capability, results in lost MSDUs, which is reported in simulation results as a packet loss rate, or an outage, associated with the application. The comparison criteria include a measure of whether this packet loss rate exceeds the maximum specified for the application in this table. Traffic carried by TCP is assumed to be served on a best-effort basis, and applications using TCP are assumed to generate MSDUs at rates up to the value given in the "Offered load" column. Being an acknowledged protocol with a constrained window size, TCP responds to congestion in the BSS by reducing application throughput without losing MSDUs. This effect is reflected in simulation results by reporting achieved throughput for applications using TCP. Note: Acknowledgement traffic is generated by TCP sinks, this is not explicitly specified in the simulation scenarios, but it is included in the count of non-QoS flows and measurement of goodput. P. Chambelin, Thomson R&D France

Definition of environments from TGn January 2009 Definition of environments from TGn Source : doc.: IEEE 802.11-03/802r23 IEEE P802.11 Wireless LANs Usage Models Environment Includes Applicable Channel Model Residential, Domestic or Home Intra-room Room to room Indoor to outdoor Large multi-family dwelling. Note: one or more PCs in the home may be notebooks or other portable devices that come home with the user. these wireless devices may have more than one wireless technology included. B House to house One main house has AP with uplink connection, Another house holds single or multiple STA(s), Guest house, garage or studio. In garage model, STA may be embed inside a car. F Small Enterprise Enclosed offices Meeting room / conference room Classroom C Medium/Large Enterprise Sea of cubes Multi-story office environment Campus E P. Chambelin, Thomson R&D France

Definition of environments from TGn January 2009 Definition of environments from TGn Source : doc.: IEEE 802.11-03/802r23 IEEE P802.11 Wireless LANs Usage Models Environment Includes Applicable Channel Model Hotspot Airport Library Convention center Hotel Shopping mall Arcade Train station / bus terminal Drive-in window F Outdoor Outdoor sport event Campus City Square Public park Amusement park Industrial Indoor Large factory floor Hospital Warehouse Concert hall / auditorium Movie theatre Other custom environments Wireless backhaul Fixed wireless access: outside to multiple STA inside outside to multiple STA outside Mobile Train Bus Plane Roadside APs for data-service in-car (fast roaming) C P. Chambelin, Thomson R&D France

Definition of environments from WFA January 2009 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

Definition of environments Proposal January 2009 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

January 2009 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

January 2009 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