Download
homerf n.
Skip this Video
Loading SlideShow in 5 Seconds..
HomeRF PowerPoint Presentation

HomeRF

436 Vues Download Presentation
Télécharger la présentation

HomeRF

- - - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - - -
Presentation Transcript

  1. HomeRF Shared Wireless Access Protocol(SWAP)

  2. SWAP: Enabling the Vision Grandma’s Brownies 3 cups flour 1 cup grated chocolate 1 cup sugar 1 stick butter Control Point USB Phone Printer Camera Game Pad Cable 1394 TV Stereo Camcorder VCR Home Wired Networks (Phone, AC Power) 78 Security System 2nd PC Thermostat Lamp

  3. DECT Uses TDMA Good for Voice 802.11 Uses CSMA/CA Good for Data SWAP TDMA + CSMA/CA Good for Voice & Data Optimized for small networks (in home) HomeRF Origins Both voice and data are important for home RF

  4. Where does HomeRF fit? • It handles voice like DECT or PHS, but... • Frequency hopping • 20 ms frames • interleaved up and down links • Retransmission (single) • It handles data like 802.11, but... • Relaxed PHY layer specs to reduce cost • Beacons to manage isochronous traffic • Simplified protocol (no PCF) • Unlike PHS, DECT or 802.11, SWAP supports TCP/IP network traffic at speeds of up to 2Mb/s - and supports PC enabled cordless telephones

  5. Grandma’s 3 cups flour 1 cup grated chocolate 1 cup sugar 1 stick butter 1/2 cup chopped walnuts minutes. HOME INDEX Fridge pad Cordless Telephone CP PSTN Device Types TDMA - Isochronous (I node) > minimum latency -telephones, etc. CSMA - Asynchronous (A node) > TCP/IP traffic • CP - Connection point…can manage a network or act as an A node • Can be USB, PCI, PC-Card, Device Bay, etc. • CP can place calls even when PC is down • Three CP classes 19

  6. TDMA I Node TDMA I Node CP CP CSMA A Node CSMA A Node CP Grandma’s 3 cups flour 1 cup grated chocolate 1 cup sugar 1 stick butter 1/2 cup chopped walnuts minutes. Connection Point* TDMA I Node HOME INDEX PSTN Fridge pad CSMA A Node HOME INDEX CSMA & TDMA A/I Node CSMA A Node • It’s a circuit switched, isochronous network • It’s a packet switched, asynchronous network • It’s both - I nodes get priority on bandwidth Topology SWAP Frame

  7. The SWAP Frame D4 D3 D2 D1 B D3 D4 Contention period Hop Hop • Hybrid TDMA/CSMA frame • Up to 6 I nodes, with retransmission • Virtually unlimited A nodes • Beacon from CP sets frame structure (if voice present) • Frequency hopping, 50/sec • 2 or 4 GFSK yields 1 or 2 Mb/s • Supports TCP/IP voice • Range up to 50 meters indoors CSMA/CA access mechanism U4 U3 U2 U1 U3 U4 Superframe - 20ms

  8. Class 1: CSMA node (power management) + TDMA network management Class 2: CSMA node only + power management TDMA I Node CP TDMA I Node PSTN Grandma’s 3 cups flour 1 cup grated chocolate 1 cup sugar 1 stick butter 1/2 cup chopped walnuts minutes. HOME INDEX Fridge pad Classes of CP Class 3: Low cost CSMA node (proposed) CSMA A Node CP CSMA A Node

  9. The PC interface • SWAP’s PC connection is designed for use under Windows 98 , NT5, and beyond • Wake on ring • Connection Oriented NDIS (NDIS 5…for NT5) • A nodes become 802.3 networking devices • I nodes become ATM clients to TAPI Proxy in NT5 • Win95/98 will support some types of streaming • Standard interfaces to Windows 95 and 98 will be connectionless • Connection oriented streaming applications will be vendor specific Product names are trademarked by their respective companies

  10. PC Software Architecture Diagram NT5 TAPI 3.0 connection- oriented client DirectShow connection- less client NT5 NT5 NDIS TAPI proxy RCA filter connection-oriented I/F connectionless I/F “Ethernet” MP/CM Product names are trademarked by their respective companies

  11. Handset initiates voice transfer to PC TDMA I Node • Application accepts streaming audio from CP Application CP IWU Co-NDIS • Application performs speech recognition and sends commands back down stack PC CP • For automatic call placement, CP dials number and connects handset CSMA A Node Grandma’s 3 cups flour 1 cup grated chocolate 1 cup sugar 1 stick butter 1/2 cup chopped walnuts minutes. HOME INDEX Fridge pad • Handset - PSTN connection remains until call teardown Usage - Voice Control PSTN Data traffic can also be active

  12. PC initiates ISP connection (modem, ISDN, UDSL, Cable, etc.) • Applications on host PC can access ISP immediately • Remote CSMA nodes access ISP through NAT and TCP/IP • Remote CSMA nodes can also share files and printers Grandma’s 3 cups flour 1 cup grated chocolate 1 cup sugar 1 stick butter 1/2 cup chopped walnuts minutes. • Ad hoc peer-peer transfers between nodes do not require resources of “server” PC HOME INDEX Fridge pad Usage - ISP Sharing Voice traffic can also be active TDMA I Node Application CP IWU Co-NDIS CSMA A Node PC CP USB PSTN CSMA A Node

  13. Specification timeline ‘98 Jan HomeRF Disclosure to Early Members ‘98 Q1 HomeRF Working Group Announced Specification Refinement & Prototyping ‘98 Q2 Early Member Workshop, SWAP Educational Seminar ‘98 Q3 Specification Refinement (Rev 0.7) & Prototyping Developer’s Workshop, Prototype Demo’s ‘98 Q4 Specification at Rev 0.9 Rev1.0 Provisional Specification Complete 99 1H First Components Expected Compliance Workshop 99 2H First Products Expected!

  14. HomeRF Summary • Home RF Working group developing open, royalty free spec • Over 60 member companies • NOW is the time to begin implementation plans • More info (including membership) at www.homerf.org