802.11 for video transmission September 2005 doc.: IEEE 802.11-05/0910r0 September 2005 802.11 for video transmission Date: 2005-09-20 Authors: 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>. Clifford Tavares, Hitachi America Ltd. Clifford Tavares, Hitachi America Ltd.

September 2005 doc.: IEEE 802.11-05/0910r0 September 2005 Abstract We identify two-dimensional QoS and dynamic priority, rate and FEC adaptation based on RRM. We present some initial results on the home networking scenarios, simulation of 802.11e, and a direct link selection mechanism. Clifford Tavares, Hitachi America Ltd. Clifford Tavares, Hitachi America Ltd.

Outline Potential solutions to the 802.11e limitations September 2005 Outline Potential solutions to the 802.11e limitations Two-dimensional QoS Dynamic priority, rate, and FEC adaptation based on RRM Home networking scenarios and the limitations of 802.11e Initial 802.11e (HCCA and EDCA) throughput analysis and comparison for information Direct link mode selection mechanism Video distribution prototype/simulation platform Plan for November 2005 Conclusions Clifford Tavares, Hitachi America Ltd.

Summary of July 2005 presentation September 2005 Summary of July 2005 presentation 802.11e is insufficient for HDTV transmission It is a static one-dimensional QoS Scheduling and admission control are left out Jitter and latency are not part of TSPEC Content-specific dynamic link adaptation Potential solutions to the 802.11e limitations Two-dimensional QoS model Dynamic priority, rate, and FEC adaptation based on RRM Should these be at the MAC level or at a higher level? Clifford Tavares, Hitachi America Ltd.

An example of a two-dimensional QoS September 2005 An example of a two-dimensional QoS Clifford Tavares, Hitachi America Ltd.

Dynamic priority, rate, and FEC adaptation based on RRM September 2005 Dynamic priority, rate, and FEC adaptation based on RRM The traditional view of rate adaptation is data rate vs. SNR (one-dimensional!) Video BSS This requires MAC-level solution! Clifford Tavares, Hitachi America Ltd.

Content Distribution Scenarios: AP Enabled September 2005 Content Distribution Scenarios: AP Enabled Clifford Tavares, Hitachi America Ltd.

Content Distribution Scenarios: Point-to-point September 2005 Content Distribution Scenarios: Point-to-point Clifford Tavares, Hitachi America Ltd.

802.11e limitations for the given scenarios September 2005 802.11e limitations for the given scenarios 802.11e is insufficient to achieve the required performance for these scenarios 802.11e does not scale well Discriminates traffic, but there is no provision for dealing with multiple video streams across communicating peers No cooperation among video clients in a BSS If it is data/mixed traffic, they are not supposed to cooperate Not optimized given the radio resources (channel conditions, network type, traffic type) Does not include dynamic priority, rate and FEC Clifford Tavares, Hitachi America Ltd.

Initial HCCA throughput analysis for video September 2005 Initial HCCA throughput analysis for video Clifford Tavares, Hitachi America Ltd.

HCCA throughput for normal ACK, block and no ACK, 802.11a September 2005 HCCA throughput for normal ACK, block and no ACK, 802.11a Clifford Tavares, Hitachi America Ltd.

HCCA throughput for block and no ACK, 802.11a September 2005 HCCA throughput for block and no ACK, 802.11a Clifford Tavares, Hitachi America Ltd.

EDCA throughput, priority level 5 (video), normal ACK, 802.11a September 2005 EDCA throughput, priority level 5 (video), normal ACK, 802.11a Clifford Tavares, Hitachi America Ltd.

Throughput comparison DCF, EDCA, HCCA, 802.11a September 2005 Throughput comparison DCF, EDCA, HCCA, 802.11a Clifford Tavares, Hitachi America Ltd.

Direct Link Mode Selection Mechanism September 2005 Direct Link Mode Selection Mechanism Select link with best throughput Traffic Profiles: F(…), F1(…), F2(…) … Power ON/ Runtime A Link Quality Assessment Apply Traffic Profile Direct Link AP mode Y Traffic Profile Defined? N Fig: Flowchart showing operating mode selection process Clifford Tavares, Hitachi America Ltd.

Direct Dynamic Mode Selection September 2005 Direct Dynamic Mode Selection Transmission Mode Fig: State machine showing runtime operation. Periodic link Quality Assessment / No Change in state Periodic link Quality Assessment / Change in state Configuration mode (A) Configuration Complete Clifford Tavares, Hitachi America Ltd.

Video Distribution Prototype/Simulation Platform September 2005 Video Distribution Prototype/Simulation Platform Clifford Tavares, Hitachi America Ltd.

Video Distribution Prototype: Network Topology September 2005 Video Distribution Prototype: Network Topology Example Topology Computer Computer HDTVPlayer HDTVPlayer Wireless Client Source: Receive from Network Target: Record and Display Source: ATSC Digital Tuner Target: Record, Display & Network Computer HDTVPlayer Source: HDTV from DVD Drive Target: Display & Network Wireless Access Point HDTVPlayer Source: Receive from Network Target: Display Only HDTVPlayer Wireless Client Source: HDTV from Harddrive Target: Network Only HDTVPlayer Src: Receive from Network Target: Display & Network Re- broadcast Clifford Tavares, Hitachi America Ltd.

September 2005 Plan for November 2005 Theoretical analysis of home video networking scenarios Network simulation of A-Video WLAN with proposed QoS/MAC Further enhancements Video multicast … Performance benchmarks, implementation cost analysis Clifford Tavares, Hitachi America Ltd.

September 2005 Conclusions Dynamic priority, rate, and FEC adaptation with content-specific RRM is required It must be done at the MAC level There is DLP in 802.11e, but there is no content-specific mode selection mechanism Under one set of circumstances DLP is better and another set of circumstances AP mode is better We have presented for information only: An initial analysis of 802.11e throughput Prototype/simulation platform to be used for future network analysis 802.11e is an improvement for video, but is insufficient to realize the home networking vision Clifford Tavares, Hitachi America Ltd.

September 2005 References Stephen McCann, “DVB-WIN Update”, doc. 802.11-05/1618r0, January 2005. C. Tavares, T. Cooklev, “802.11 for high data rate multimedia transmission”, doc. 802.11-0632r0, July 2005. Clifford Tavares, Hitachi America Ltd.