VTS SG PAR Scope Topics Date: 2007-12-17 Authors: January 2008 November 2007 doc.: IEEE 802.11-07/2752r1 January 2008 VTS SG PAR Scope Topics Date: 2007-12-17 Authors: Ganesh Venkatesan, Intel Corporation Peter Ecclesine, Cisco Systems

November 2007 doc.: IEEE 802.11-07/2752r1 January 2008 Abstract This submission is a high level description of VTS SG PAR Scope topics. Ganesh Venkatesan, Intel Corporation Peter Ecclesine, Cisco Systems

November 2007 doc.: IEEE 802.11-07/2752r1 January 2008 What is in the PAR Scope? Interworking with relevant 802.1 mechanisms including, but not limited to, 802.1Qat, 802.1Qav and 802.1AS Fine-grained packet discarding Increased robustness in overlapping BSS environments, based upon enhancing existing 802.11 mechanisms without the requirement for a centralised management entity. Modified EDCA timing and parameter selection for video transport Asynchronous multicast streaming independent of power save modes employed by associated stations. Broadcast Video 802.1 “Wireless Bridge” proposal Ganesh Venkatesan, Intel Corporation Peter Ecclesine, Cisco Systems

January 2008 Interworking with 802.1* Map 802.1Qat and 802.1Qav into 802.11; 802.1Qat – Stream Reservation Protocol, 802.1Qav – forwarding and Queuing Enhancements for Time-Sensitive Streams. *802.1AS support is already part of 802.11v. Ganesh Venkatesan, Intel Corporation

January 2008 Interworking with 802.1 Ensure that 802.1Qat SRP – end-end QoS is supported as specified in 802.1Qat across 802.11 links Ensure that 802.1Qav ‘priority regeneration’ works seamlessly over 802.11 links Ensure that 802.1AS support in 802.11v is sufficient to provide the required 802.1 Audio/Video Bridging support -- and if it is not sufficient augment 802.11v support for 802.1AS and make it complete. Ganesh Venkatesan, Intel Corporation

Fine-grained packet discarding January 2008 Fine-grained packet discarding “Fine-grained ARQ and packet drop precedence to enable graceful degradation of video streams when there is insufficient channel capacity for the entire stream” Goal is to provide mechanism that enables network to make better decisions about which packets to drop when network is congested or channel conditions deteriorate Video is rather unusual in that it is a mixture of very important data, less critical data and duplicated data. Analogue TV has a big advantage of a soft roll-off in performance as SNR decreases, whereas digital TV has an all-or-nothing cliff By being more intelligent with the retransmission policy and packet discard policy, we can provide a graceful roll-off in performance Ganesh Venkatesan, Intel Corporation

Overlapping BSS Issues January 2008 Overlapping BSS Issues Provide mechanisms so that a BSS can account for “relevant activities” in overlapping BSSs “relevant activities” – example Admission Control Need to address all OBSS scenarios – AP within OBSS, some non-AP STAs within OBSS while AP is not, etc. Need to leverage existing 802.11 mechanisms as opposed to inventing new mechanisms – extend public action frames. Recommend parameter values in order to limit the scope of BSS overlap. Ganesh Venkatesan, Intel Corporation

January 2008 Modified EDCA Extend EDCA to accommodate multiple streams and differentiate between them Packet re-ordering? Send more important data first Finer priorities within AC_VI Address cases where performance of a video stream is impacted when changes happen in another video stream – Rx2 moves causing video at Rx1 to be unacceptable Prioritize Multicast/Broadcast over unicast – serve more Rxs for the same bandwidth Ganesh Venkatesan, Intel Corporation

HCCA? Modified EDCA and/or simplified HCCA for video transport January 2008 HCCA? Modified EDCA and/or simplified HCCA for video transport Document 2157r0 proposed an enhancement to EDCA Is our goal to propose HCCA-like mechanism without the complexity of HCCA? Note that all other wireless technologies – WiMAX, Bluetooth have a ‘scheduled’ medium access mechanism. Why is it considered bad for 802.11? Ganesh Venkatesan, Intel Corporation

January 2008 Broadcast Video How to enable robust broadcast/multicast Video Streams? Document 07/2954r1 – Video Broadcast/Multicast Can replace “Asynchronous multicast streaming independent of power save modes employed by associated stations.” Proposed replacements: A protocol to enable improved reliability and rate adaptation for broadcast and multicast video traffic. Enhanced multicast streaming with QoS, power-saving capabilities Ganesh Venkatesan, Intel Corporation

802.1 “Wireless Bridge” Proposal January 2008 802.1 “Wireless Bridge” Proposal Intention is to use a 802.11 device as a wired-wireless bridge. A detailed discussion on this is planned for Feb 01, 2008. Some of the issues discussed in the SF joint meeting – what happens when a wireless device is a part of a wired/wireless network? 4-address frames were proposed as a solution to mitigate some of the issues. Is this covered by “Interworking with 802.1 mechanisms” part of the scope? Comment in the Atlanta joint meeting – wanted an explicit statement in the Scope. Ganesh Venkatesan, Intel Corporation