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Wireless High-Speed Cable Replacement for Multimedia Applications

A response to the IEEE P802.15 SG3a CFA request, describing a class of applications and PHY requirements for IEEE 802.15.3a in January 2002 interim.

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Wireless High-Speed Cable Replacement for Multimedia Applications

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  1. Project: IEEE P802.15 Working Group for Wireless Personal Area Networks (WPANS) Submission Title: [XtremeSpectrum -- SG3a CFA response] Date Submitted: [January 14, 2002] Source: [Pierre Gandolfo] Company [XtremeSpectrum Inc.]Address [1001 N Rengstorff Avenue, Suite 200, Mountain View, CA, 94043]Voice [(650) 230 0494], Fax [(650) 938-7071], E-mail [pgandolfo@xtremespectrum.com] Re: [IEEE P802.15 ALT PHY Study Group was formed with the charter of drafting a PAR and 5 Criteria for an ALT PHY option for the 802.15.3 MAC] Abstract: [Description of a class of applications and PHY requirements for 802.15.3a in response to the CFA request] Purpose: [for January 2002 interim] Notice:This document has been prepared to assist the IEEE P802.15. It is offered as a basis for discussion and is not binding on the contributing individual or organization. The material in this document is subject to change in form and content after further study. The contributor reserves the right to add, amend or withdraw material contained herein. Release: The contributor acknowledges and accepts that this contribution becomes the property of IEEE and may be made publicly available by P802.15.

  2. Agenda • Minimum Desired Data Bandwidth for High Speed Cable Replacement • Market Trends for Home Networking • “Evernet” or the need for implementing Scatternet

  3. Desired Data Bandwidth for HS Cable Replacement • High Speed DV transfer from a 1394 digital camcorder to a PC can peak at 50Mbps • Digital Video Editing is today’s single most popular usage for 1394 • 8M camcorders were shipped in 2001 and 12.7M will be shipped in 2004 • New Apple IPOD (MP3 Player) is equipped with a 1394a port (100Mbps) • Capable of downloading an entire CD in less than 10 seconds and a full 5GB of music from a PC in less than 10 minutes • Its 5GB HD doubles as a Firewire mobile disk for files and applications (presentations, pictures, documents, entire digital movies) • Total AV bandwidth for DVD players is currently limited to around 36Mbps on the 1394 bus: • This allows good video quality using 30Mbps (30 frames/s, 720x576 pixels per frame, 24-bit color/pixel) • Rest of Bandwidth (6Mbps) is available for audio • “The less you compress the video, the better it looks (<1:5)”

  4. Desired Data Bandwidth for HS Cable Replacement (II) • Video gaming with high quality graphics running at 60 fps with a resolution moving towards HDTV (1280x720) will also require some extra bandwidth • High Resolution digital still cameras (>5M pixels) drive the need for memory cards with higher storage capacity and connections with faster data transfer speed: • CF+ : 8MB – 512MB • SmartMedia cards (Fuji & Olympus) : 8 – 128MB • IBM Microdrive: 340MB (can hold hundreds of high resolution images or 6 hours of CD quality audio), 500MB, 1GB • Sony Memory Stick: 64MB and 128MB • SanDisk MM Card: 8MB – 64MB • High Resolution Printer and Scanner (4000 dpi) are equipped with a 1394 connection (100Mbps and above) Minimum Required Effective Throughput = 50Mbps

  5. Max MTU Size Min. Required Throughput Max. 802.15.3 Effective Throughput (for one stream and per packet size) • Parameters: • Superframe size = 20ms, Preamble/Header data rate = 22Mb/s, Header (14 bytes), 3MTS slots per superframe (one for Association and two open ones), Imm-ACK, Beacon Frame Body = 46 bytes, no CAP, No Guard Times • Ideal Scenario is assumed: one stream only in an error-free environment (I.e “upper bound performance) • A Data Rate greater than 55Mbps is needed to support the applications previously described

  6. PHY Requirements for High Speed Cable Replacement • End-users want nothing less than the performance of a wired network without the wires • 1394a already supports 100, 200, and 400Mbps • USB 2.0 specifies a maximum speed of 480Mbps • Range is not really important for this specific application since 1394a specifies a maximum cable length of 4.5m • Limited Number of non-overlapping channels (3) • 3 independent end-users downloading their respective pictures to 3 different kiosks • To sum up, “Wireless without Compromise”: • Very High Speed PHY Technology • Minimum Effective Throughput = 50Mbps • Low Power PHY Technology • Low Cost PHY Technology • Small form factor (embedded applications) • As secure as a cable

  7. Mono-Cluster Home Network • The Mono-Cluster approach is unsuited to the requirements of concurrent multimedia-rich applications: • Poor effective throughput per user (shared media) • Lack of Flexibility: • no two houses or even apartments are alike (room, size, wall, applications) • One macrocell network cannot be optimized for every single end-user scenario Legend: Mono-cluster = Single Wireless Distribution Point covering the entire home premise area

  8. USB Cluster (ad-hoc) UMPW HUB Home Office Cluster (infrastructure) 1394 Home Entertainment Cluster (infrastructure-based) Kids’ room Cluster (ad-hoc or infrastructure-based) Gateway (OSGi) 1394 Backbone Wired Backbone (HPNA, HomePlug, Ethernet, …) or 802.11a wireless Bridge (54-108Mbps) Multi-Cluster Home Network Legend: Multi-cluster = Multiple Wireless Distribution Points covering the entire home premise area

  9. Spatial Capacity Performance = Power * Cost * Size PHY Requirements for Multi-cluster Home Network • Shorter Distances allow for spectrum reuse, thereby serving more users/devices/applications while enabling simpler wireless devices (low power, low cost, small form factor) • Performance is the ratio of Spatial capacity by Power consumption, cost and form factor: • Maximizing individual cluster speed while maintaining a low level Co-Channel interference (CCI) • The adequate number of non-overlapping channels will depend on the selected modulation waveform • Multipath Environment: JTC Residential A and B bps/sqm2 W.$.m3

  10. Proxy Nodes or Wireless Bridges Scatternet or Multi-hop Ad-hoc Network Coordinators • Definition: Autonomous, robust, efficient and dynamic system made of multiple piconets and connected to each other by some “wireless links” (hops) • Goal: Discovering/updating the links between these different groups of devices and building paths (routing) across the multi-hop ad-hoc network • Advantages: Devices belonging to different clusters can exchange data without relying on a fixed wired backbone [02/xxx] • Inexpensive alternative to cell-based mobile network infrastructure • No dependency -- Most wired backbones do not support the needed data rates and QoS provisions for MM applications • Undeserved segment (no competition)

  11. Conclusion • Broad Set of applicability: • Video Editing • Digital Camcorders, PC’s, Pro AV’s • Casual Storage • PC’s, external storages, digital still cameras, MP3 players • High Resolution PC Peripherals • A/V Networking • DVCR’s, DVD’s, HDTV, Game Consoles, set-top boxes,… • Multiple Vendors and numerous users: • “Ubiquitous Value Network”: Moving to a Networking AV broadband area • Distinct Identity: “Wireless without compromise” • Several companies have already demonstrated technical and economic feasibility

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