Directed Multicast Service (DMS) Month Year Month Year doc.: IEEE 802.11-yy/xxxxr0 doc.: IEEE 802.11-yy/xxxxr0 May 2008 Directed Multicast Service (DMS) Authors: Date: 2008-5-10 Slide 1 Emily Qi (Intel Corp) et al Page 1 Emily Qi John Doe, Some Company

Month Year Month Year doc.: IEEE 802.11-yy/xxxxr0 doc.: IEEE 802.11-yy/xxxxr0 May 2008 Background The Directed Multicast was presented in TGv Orlando meeting. The proposal intends to address CID#89 in TGv LB108 and CID#503 in TGv LB123 The issue was raised that Directed Multicast proposal may overlap with TGaa Scope: “Improved link reliability and low jitter characteristics for multicast/broadcast audio/video streams.” Objectives of the presentation: Review Directed Multicast Proposal Seek for feedback from TGv/TGaa joint meeting. Slide 2 Emily Qi (Intel Corp) et al Page 2 Emily Qi John Doe, Some Company

Agenda Directed Multicast (DMS): Motivation Month Year Month Year doc.: IEEE 802.11-yy/xxxxr0 doc.: IEEE 802.11-yy/xxxxr0 May 2008 Agenda Directed Multicast (DMS): Motivation Directed Multicast Proposal Overview Directed Multicast should be considered in TGv or TGaa Existing Multicast Enhancements in TGv TGaa Requirements Slide 3 Emily Qi (Intel Corp) et al Page 3 Emily Qi John Doe, Some Company

Directed Multicast: Motivation Month Year Month Year doc.: IEEE 802.11-yy/xxxxr0 doc.: IEEE 802.11-yy/xxxxr0 May 2008 Directed Multicast: Motivation Enable aggressive or flexible client power saving scheme Sleeping STA doesn’t need to wake up at every DTIM or FBMS interval to receive multicast frames Address Req2120:TGv shall provide mechanisms to enhance the power efficiency of broadcast and multicast data delivery Other benefits: Protect directed multicast by using the client’s negotiated Pairwise cipher with the AP Today, multicast is protected by the lowest common (or open) authentication Enable reliable service Unicast is more reliable than multicast For example, a low power device can maintain a listen interval of 2 sec where as the DTIM period can be 300ms, which may improve the client power consumption to 20% of original idle power consumption. Slide 4 Emily Qi (Intel Corp) et al Page 4 Emily Qi John Doe, Some Company

Directed Multicast Service (DMS) Overview Month Year Month Year doc.: IEEE 802.11-yy/xxxxr0 doc.: IEEE 802.11-yy/xxxxr0 May 2008 Directed Multicast Service (DMS) Overview STA advertises Directed Multicast Service (DMS) Capability Non-AP STA sends a request to specify traffic classes for the directed multicast traffic delivery AP may accept or reject the traffic class specified by the non-AP STA If the service is accepted by the AP, AP shall transmit the requested group addressed (multicast) traffic as the individual addressed (unicast) traffic to the requesting STA in an A-MSDU frame format, and AP may still transmit the group addressed traffic for other STAs within the multicast group in the BSS as normal. The requesting STA shall discard group addressed frame that matches a multicast address entry of the list. Other STAs will process group addressed traffic as normal. See doc 08/0050r1 Slide 5 Emily Qi (Intel Corp) et al Page 5 Emily Qi John Doe, Some Company

DMS Request and Response frames Month Year doc.: IEEE 802.11-yy/xxxxr0 May 2008 DMS Request and Response frames DMS Request frame: Category Action Dialog Token Request Type (“Add” or “Remove”) DMS Descriptor List Octets: 1 variable DMSID Length TCLAS Elements (optional) TCLAS Processing Element (optional) Octets: 1 variable 3 DMS Descriptor DMS Response frame: Category Action Dialog Token DMS Status List Octets: 1 DMS Status DMSID DMS Status Octets: 1 Emily Qi (Intel Corp) et al Slide 6 Emily Qi

A-MSDU is used for Directed Multicast June 2007Month Year Month Year doc.: IEEE 802.11-yy/xxxxr0 doc.: IEEE 802.11-yy/xxxxr0 May 2008 A-MSDU is used for Directed Multicast Original destination address (DA) is transmitted in A-MSDU subframe header (the DA field) The DA and SA fields of the A-MSDU subframe header contain the values passed in the MA-UNITDATA.request and MA-UNITDATA.indication primitives. (e.g. DA=multicast address) RA (Address 1) in the MAC header is set to the requesting non-AP STA address Support of A-MSDU processing is mandatory according to the IEEE 802.11n specification. Emily Qi (Intel Corp) et al Zhen Xie, Atheros, et al.John Doe, Some Company Page 7 Zhen Xie, Atheros, et al.John Doe, Some Company Emily Qi

Should Directed Multicast be considered in TGv or TGaa ? Month Year Month Year doc.: IEEE 802.11-yy/xxxxr0 doc.: IEEE 802.11-yy/xxxxr0 May 2008 Should Directed Multicast be considered in TGv or TGaa ? Slide 8 Emily Qi (Intel Corp) et al Page 8 Emily Qi John Doe, Some Company

Existing Multicast Enhancements in TGv Month Year Month Year doc.: IEEE 802.11-yy/xxxxr0 doc.: IEEE 802.11-yy/xxxxr0 May 2008 Existing Multicast Enhancements in TGv FBMS – Flexible Broadcast/Multicast Service Enables flexible delivery interval for broadcast/multicast as STA’s request (at multiples of the DTIM intervals) Enables group addressed frames to be transmitted at higher data rates, reducing the amount of basic rate traffic sent over the radio link. Multicast Diagnostics Reporting STA provides the AP an indication of the number of dropped group addressed frames in order to enable reliable service DMS adds to existing multicast enhancements in TGv, naturally fits in TGv Slide 9 Emily Qi (Intel Corp) et al Page 9 Emily Qi John Doe, Some Company

DMS and 802.11aa targets different applications space Month Year doc.: IEEE 802.11-yy/xxxxr0 May 2008 802.11aa Requirements Reliable Multicast is a complex problem, and different applications may require different solutions. DMS provides same level of reliability as unicast for all traffic classes, at the cost of bandwidth Directed multicast can be used while streaming a multicast Standard Definition (SD) stream to 2 or 3 STAs, it does not scale well for High Definition (HD) video streaming. 802.11aa targets B/M robustness (reliability is a part of robustness) for HD video streaming (high bandwidth) applications .11n is sufficient for Standard Definition video streaming DMS targets low bandwidth applications, which is not the target of 802.11aa DMS and 802.11aa targets different applications space Emily Qi (Intel Corp) et al Emily Qi

DMS should be considered in TGv Month Year doc.: IEEE 802.11-yy/xxxxr0 May 2008 DMS should be considered in TGv DMS addresses TGv objective [Req 2120], complements TGv FBMS FBMS provides power saving for TGv devices. However, the legacy device (non-TGv device) within the BSS will experience unexpected B/M delivery delay. DMS provides power saving for TGv devices without introducing latency on the legacy (non-TGv) device. However, its usage is limited to a small number of associated STAs due to bandwidth requirements. Including DMS in TGv can benefit low bandwidth applications sooner TGv is in the process of initial ballots, expected sponsor ballot in Jan-09 TGaa is at the stage of calling for proposals, expected sponsor ballot Nov-10 Including DMS in TGv should also benefit TGaa All features (e.g. DMS) specified in the existing draft standard and draft amendments (e.g. TGv) can be utilized by later amendments (e.g. TGaa) Emily Qi (Intel Corp) et al Emily Qi

Questions? May 2008 Month Year doc.: IEEE 802.11-yy/xxxxr0 Slide 12 Emily Qi (Intel Corp) et al Emily Qi

Straw Poll Directed multicast should be considered in: TGv: TGaa: Month Year Month Year doc.: IEEE 802.11-yy/xxxxr0 doc.: IEEE 802.11-yy/xxxxr0 May 2008 Straw Poll Directed multicast should be considered in: TGv: TGaa: Don’t care: Slide 13 Emily Qi (Intel Corp) et al Page 13 Emily Qi John Doe, Some Company