Latency-sensitive Applications - metrics 11/14/2018 doc.: IEEE 802.11-yy/0r0 Latency-sensitive Applications - metrics Sept 2005 Authors: Date: Sept, 2005 Notice: This document has been prepared to assist IEEE 802.11. It is offered as a basis for discussion and is not binding on the contributing individual(s) or organization(s). The material in this document is subject to change in form and content after further study. The contributor(s) reserve(s) the right to add, amend or withdraw material contained herein. Release: The contributor grants a free, irrevocable license to the IEEE to incorporate material contained in this contribution, and any modifications thereof, in the creation of an IEEE Standards publication; to copyright in the IEEE’s name any IEEE Standards publication even though it may include portions of this contribution; and at the IEEE’s sole discretion to permit others to reproduce in whole or in part the resulting IEEE Standards publication. The contributor also acknowledges and accepts that this contribution may be made public by IEEE 802.11. Patent Policy and Procedures: The contributor is familiar with the IEEE 802 Patent Policy and Procedures <http:// ieee802.org/guides/bylaws/sb-bylaws.pdf>, including the statement "IEEE standards may include the known use of patent(s), including patent applications, provided the IEEE receives assurance from the patent holder or applicant with respect to patents essential for compliance with both mandatory and optional portions of the standard." Early disclosure to the Working Group of patent information that might be relevant to the standard is essential to reduce the possibility for delays in the development process and increase the likelihood that the draft publication will be approved for publication. Please notify the Chair <stuart.kerry@philips.com> as early as possible, in written or electronic form, if patented technology (or technology under patent application) might be incorporated into a draft standard being developed within the IEEE 802.11 Working Group. If you have questions, contact the IEEE Patent Committee Administrator at <patcom@ieee.org>. S.Bangolae, Intel Sangeetha Bangolae, Intel

11/14/2018 doc.: IEEE 802.11-yy/0r0 Sept 2005 Abstract This presentation is to provide an outline of metrics for Latency-sensitive applications (typically VoIP over Wireless) such as One-way delay, Jitter, Packet loss, VoIP quality S.Bangolae, Intel Sangeetha Bangolae, Intel

Sept 2005 Summary Introduction and Purpose Metrics S.Bangolae, Intel

Introduction and Purpose Sept 2005 Introduction and Purpose Latency-sensitive applications such as VoIP over WLAN need characterization In addition to VoIP quality for user perception, secondary metrics such as latency, jitter, loss, and roaming time are important STA based metrics AP based metrics <TBD> S.Bangolae, Intel

Metrics and conditions Sept 2005 Metrics and conditions Primary Metric: VoIP Quality Secondary Metrics: One-way delay Jitter Packet loss Bursty loss (measure consecutive packets lost more than 1 in consecutive manner) – very important to determine bursty medium BSS transition time Fast BSS transition time Test Conditions: Stationary STA Roaming STA S.Bangolae, Intel

Metrics - Definitions Latency or One Way Delay: Jitter Packet Loss Sept 2005 Metrics - Definitions Latency or One Way Delay: One Way delay is measured as the difference between the time a packet was sent to the time the packet was received at the endpoint; Requires Synchronization of the endpoints Measured in both directions Jitter Jitter is the delay variation (calculated using the delay measurement) Packet Loss Number of packets lost (Calculated by determining the total number of datagrams sent by the sender and those received by the DUT) BSS/Fast BSS Transition time Roaming times; Refer presentation documents 874r1 and 950r0 VoIP Quality A quality parameter such as R-factor (ITU G.107, E-model) or PESQ (ITU P.862) needs to be evaluated S.Bangolae, Intel

Test Variables Modifiers Test Conditions Sept 2005 QoS or 802.11e 11/14/2018 doc.: IEEE 802.11-yy/0r0 Sept 2005 Test Variables Modifiers QoS or 802.11e Security Authentication method Encryption method Frame interval Frame size Test Conditions Unidirectional (upstream/downstream)/Bi-directional Wireless to Wired Wireless to Wireless Simultaneous latency-sensitive streams Background traffic load Path loss (dB) S.Bangolae, Intel Sangeetha Bangolae, Intel

Sept 2005 References [1] P802.11.2-D0.1 Draft Recommended Practice for the Evaluation of 802.11 Wireless Performance [2] IEEE 802.11-1999 [3] IEEE 802.11-05/419r1. Alexander Tolpin et al Conductive Test Environment [4] IEEE 802.11-05/1641r1. Tom Alexander. Metrics Template Example S.Bangolae, Intel

Sept 2005 Thank you! S.Bangolae, Intel