1. doc.:IEEE 802.11-09/1050r0 Submission September 23, 2009 Samsung Slide 1 Possible Technologies for TGac Mobile Device Support Authors: Date: 2009-09-23

2. doc.:IEEE 802.11-09/1050r0 Submission September 23, 2009 Samsung Slide 2 Introduction In April, we suggested 11ac TG consider support for mobile /portable devices (11-09-0453r1) In today’s presentation, we explain the definition of mobile/portable devices and their special characteristics/requirements. Based on these requirements, we suggest functional blocks for supporting mobile/portable devices in 11ac Slide 2

3. doc.:IEEE 802.11-09/1050r0 Submission September 23, 2009 Samsung Slide 3 In Our Last Presentation Mobile Device – An Important Market Segment for WLAN –11-09-0453-01-00ac-mobile-device-an-important-market-segment-for- wlan.ppt Summary –Wi-Fi applications are getting diversified While some requires high throughput Others may impose additional requirements –Mobile device is a huge market for Wi-Fi and is growing rapidly One day the number of mobile/portable Wi-Fi devices will exceed that of fixed Wi-Fi devices. –Suggested 11ac TG consider support for mobile/portable devices, especially the support of enhanced power saving mechanism, when working on functional requirements

4. doc.:IEEE 802.11-09/1050r0 Submission September 23, 2009 Samsung Slide 4 Mobile Device (MD) Definition –In the WLAN environment, we define mobile devices as those devices that fully function while moving (at walking speed). Examples: cellular/smart phone, PMP, mp3 player, game console and other handheld CE devices Non-examples: laptop computer, netbook, smartbook Characteristics –Battery powered –Small form factor Palm size or smaller –Mobility

5. doc.:IEEE 802.11-09/1050r0 Submission September 23, 2009 Samsung Slide 5 Impacts of MD’s Characteristics Battery powered –Need efficient power saving mechanisms Small form factor –May affect the number of antennas (the number of spatial streams) We consider the maximum number of antennas is limited by 2 (or 4) –Need throughput enhancement features for compensation Multiple channel, higher modulation, (downlink) MU-MIMO Mobility –Most of the time mobile devices will operate in a stationary mode (no movement) –In some cases they may move faster than walking speed Examples include waving the Wi-Fi enabled game controller. This may affect the coherence time

6. doc.:IEEE 802.11-09/1050r0 Submission September 23, 2009 Samsung Slide 6 Technologies Needed for MD Support Power saving schemes Multi-user support (Increase Multi-Users throughput) Multi-channels Ad-hoc mode (Direct link)

7. doc.:IEEE 802.11-09/1050r0 Submission September 23, 2009 Samsung Slide 7 Power Saving Schemes Extending run time of mobile devices Possible approaches –Enhancement of existing power saving protocols E.g., PSM, APSD, PSMP –New power saving protocol –Higher data rate also helps on power saving STAs can spend less time transmitting/receiving, and more time sleeping.

8. doc.:IEEE 802.11-09/1050r0 Submission September 23, 2009 Samsung Slide 8 Multi-User Support Increasing system throughput –Major requirement in 11ac Possible approaches and Advantages –MU-MIMO Downlink MU-MIMO could be considered as a core feature Good for mobile devices in terms of the number of antennas –Enhanced Aggregation scheme A-MPDU may have Multi Receivers (discussed in 11n) Issues –MPDUs destined to multiple receivers in an A-MPDU may prolong the wake time of the receivers. –Immediate ACK/BlockACK requires new mechanism.

9. doc.:IEEE 802.11-09/1050r0 Submission September 23, 2009 Samsung Slide 9 Multiple Channels Using multiple channels increases system throughput –Need to consider complexity for mobile device Possible approaches and Advantages –Channel Bonding Use wider channels (e.g., contiguous channels) Simple way to increase throughput and easy to be applied in mobile device Issues –Need to have a solution for backward compatibility (e.g., PCO) when channel bonding is used –Use of non-adjacent channels may be too complex and costly for mobile devices. –Support for dynamic channel switching/selection

10. doc.:IEEE 802.11-09/1050r0 Submission September 23, 2009 Samsung Slide 10 Others Ad-hoc Mode (direct link) –Could increase the network throughput (multi-station throughput) –Mobile device could introduce more flexible connections between devices May increase the use of direct links

11. doc.:IEEE 802.11-09/1050r0 Submission September 23, 2009 Samsung Slide 11 Usage Models Mapped to Mobile Scenarios Category#Usage modelMobile Scenario? 1. Wireless Display 1aDesktop Storage & Display (Uncompressed video) Probably 1b Projection to TV or projector in conf room (lightly compressed video) Yes 1cIn room gaming (lightly compressed video) Yes 1dStreaming from camcorder to display (lightly compressed video) Yes 1eBroadcast TV field pick up No 2. Distribution of HDTV 2aLightly compressed video streaming around the home No 2bCompressed video streaming around home Probably (in room) 2cIntra large vehicle (e.g. airplane) applications No 2dWireless networking for office Yes 2eRemote medical assistance Yes 3. Rapid upload/download 3aRapid sync-n-go file transfer Yes 3bPicture by picture viewing No 3cAirplane docking No 3dMovie content download to car No 3ePolice / surveillance car upload No 4. backhaul 4aMulti-media mesh backhaul No 4bPoint-to-point backhaul Probably 5. Outdoor campus/auditorium 5aVideo demos / tele-presence in auditorium No 5bPublic safety mesh No 6. Manufacturing floor 6aManufacturing floor automation No Doc.:IEEE 802.11-09/0161r2

12. doc.:IEEE 802.11-09/1050r0 Submission September 23, 2009 Samsung Slide 12 Summary Characteristics of mobile devices –Battery powered –Small form factor –Mobility Functional blocks needed for mobile device support –Power Saving –Multi-User Support Downlink MU-MIMO Efficient aggregation scheme –Wider Channels Contiguous Multi-Channels –Direct Link Support