1 HomeRF Shared Wireless Access Protocol (SWAP)

2 SWAP: Enabling the Vision Printer CameraGame Pad USB StereoCamcorderVCR TV 1394 Phone Cable Grandma’s Brownies 3 cups flour 1 cup grated chocolate 1 cup sugar 1 stick butter Control Point Lamp2nd PCThermostat Security System Home Wired Networks (Phone, AC Power) 78

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

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

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

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

7 The SWAP Frame Hybrid TDMA/CSMA frame Hybrid TDMA/CSMA frame  Up to 6 I nodes, with retransmission  Virtually unlimited A nodes Beacon from CP sets frame structure (if voice present) Beacon from CP sets frame structure (if voice present) Frequency hopping, 50/sec Frequency hopping, 50/sec 2 or 4 GFSK yields 1 or 2 Mb/s 2 or 4 GFSK yields 1 or 2 Mb/s Supports TCP/IP voice Supports TCP/IP voice Range up to 50 meters indoors Range up to 50 meters indoors Contention period CSMA/CA access mechanism Hop Superframe - 20ms BD3D4 U3U4 D4 U4 D2 U3 D3 U2 D1 U1 Hop

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

9 The PC interface SWAP’s PC connection is designed for use under Windows 98, NT5, and beyond 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 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 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 RCA filter NDIS TAPI proxy TAPI 3.0 connection- oriented client connection- less client DirectShow “Ethernet” MP/CM connectionless I/Fconnection-oriented I/F NT5 NT5 NT5 Product names are trademarked by their respective companies

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

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

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

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