HomeRF

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HomeRFHomeRFShared Wireless Access ProtocolShared Wireless Access Protocol

(SWAP)(SWAP)

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SWAP: Enabling the VisionSWAP: Enabling the Vision

PrinterCamera Game Pad

USB

Stereo Camcorder VCR TV

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Phone

Cable

Grandma’s Brownies3 cups flour1 cup grated chocolate1 cup sugar1 stick butter

Control Point

Lamp2nd PC Thermostat Security System

Home WiredNetworks(Phone, AC Power)

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HomeRF OriginsHomeRF Origins

SWAPSWAPTDMA + CSMA/CATDMA + CSMA/CA

Good for Voice & DataGood for Voice & DataOptimized for small networks (in home)Optimized for small networks (in home)

802.11802.11Uses CSMA/CAUses CSMA/CAGood for DataGood for Data

DECTDECTUses TDMAUses TDMA

Good for VoiceGood for Voice

Both voice and data are important for home RFBoth voice and data are important for home RF

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Where does HomeRF fit?Where does HomeRF fit? It handles voice like DECT or PHS, but...It handles voice like DECT or PHS, but...

Frequency hoppingFrequency hopping20 ms frames20 ms framesinterleaved up and down linksinterleaved up and down linksRetransmission (single)Retransmission (single)

It handles data like 802.11, but...It handles data like 802.11, but...Relaxed PHY layer specs to reduce costRelaxed PHY layer specs to reduce costBeacons to manage isochronous trafficBeacons to manage isochronous trafficSimplified protocol (no PCF)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

•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

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Device TypesDevice Types

Cordless TelephoneCordless Telephone

TDMA - Isochronous TDMA - Isochronous (I node)(I node)> minimum latency -telephon> minimum latency -telephones, etc.es, etc.

CSMA - Asynchronous CSMA - Asynchronous (A node)(A node)> TCP/IP traffic> TCP/IP traffic

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•CP - Connection point…can manage a CP - Connection point…can manage a network or act as an A nodenetwork or act as an A node

• Can be Can be USBUSB, PCI, PC-Card, Device Bay, , PCI, PC-Card, Device Bay, etc.etc.• CP can place calls even when PC is downCP can place calls even when PC is down• Three CP classesThree CP classes

CPCPCPCP

PSTNPSTN

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TopologyTopology

CPCP

Connection Point*Connection Point*

PSTNPSTN

SWAP FrameSWAP Frame

• It’s a circuit switched, isochronous network

TDMATDMAI NodeI Node TDMATDMA

I NodeI Node

TDMATDMAI NodeI Node

CPCP

CSMACSMAA NodeA Node

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CPCP



• It’s a packet switched, asynchronous network

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CSMA & TDMACSMA & TDMAA/I NodeA/I Node

• It’s both - I nodes get priority on bandwidth

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The SWAP FrameThe SWAP Frame

Hybrid TDMA/CSMA frameHybrid TDMA/CSMA frame Up to 6 I nodes, with retransmissionUp to 6 I nodes, with retransmission Virtually unlimited A nodesVirtually unlimited A nodes

Beacon from CP sets frame structure (if voice Beacon from CP sets frame structure (if voice present)present)

Frequency hopping, 50/secFrequency hopping, 50/sec 2 or 4 GFSK yields 1 or 2 Mb/s2 or 4 GFSK yields 1 or 2 Mb/s Supports TCP/IP voiceSupports TCP/IP voice Range up to 50 meters indoorsRange up to 50 meters indoors

Contention periodCSMA/CA access mechanism

Ho

p

Superframe - 20msSuperframe - 20ms

B D3 D4

U3 U4

D4

U4

D2

U3

D3

U2

D1

U1

Ho

p

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Classes of CPClasses of CP

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Class 3: Low cost CSMA node (proposed)Class 3: Low cost CSMA node (proposed)

CPCPCPCP

Class 2: CSMA node only + power managementClass 2: CSMA node only + power management


TDMATDMAI NodeI NodePSTNPSTN

Class 1: CSMA node (power management) + TDMA network Class 1: CSMA node (power management) + TDMA network managementmanagement

CPCP

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The PC interfaceThe PC interface SWAP’s PC connection is designed for use under SWAP’s PC connection is designed for use under

Windows 98 , NT5, and beyondWindows 98 , NT5, and beyond Wake on ringWake on ring Connection Oriented NDIS (NDIS 5…for NT5)Connection Oriented NDIS (NDIS 5…for NT5) A nodes become 802.3 networking devicesA nodes become 802.3 networking devices I nodes become ATM clients to TAPI Proxy in NT5I nodes become ATM clients to TAPI Proxy in NT5 Win95/98 will support some types of streamingWin95/98 will support some types of streaming

Standard interfaces to Windows 95 and 98 will be cStandard interfaces to Windows 95 and 98 will be connectionlessonnectionless

Connection oriented streaming applications will be vendoConnection oriented streaming applications will be vendor specificr specific

Product names are trademarked by Product names are trademarked by their respective companiestheir respective companies

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PC Software PC Software Architecture DiagramArchitecture Diagram

RCA filterNDIS TAPI

proxy

TAPI 3.0 connection-oriented client

connection-less clientDirectShow

“Ethernet”MP/CM

connectionless I/Fconnection-oriented I/F

NT5NT5

NT5NT5

NT5NT5

Product names are trademarked by Product names are trademarked by their respective companiestheir respective companies

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Usage - Voice ControlUsage - Voice Control

CP IWU Co-NDIS

Application

PCCP

PSTN


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CSMAA Node

• Handset initiates voice Handset initiates voice transfer to PCtransfer to PC

• Application accepts Application accepts streaming audio from CPstreaming audio from CP

• Application performs speech Application performs speech recognition and sends recognition and sends commands back down stackcommands back down stack

• For automatic call For automatic call placement, CP dials number placement, CP dials number and connects handsetand connects handset

• Handset - PSTN connectiHandset - PSTN connection remains until call teardon remains until call teardownown

Data traffic can also be active

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Usage - ISP SharingUsage - ISP Sharing


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CSMAA Node

CP IWU Co-NDIS

Application

PCCP

PSTNPSTN

• PC initiates ISP connection PC initiates ISP connection (modem, ISDN, UDSL, Cable, etc.)(modem, ISDN, UDSL, Cable, etc.)

• Applications on host PC can Applications on host PC can access ISP immediatelyaccess ISP immediately

• Remote CSMA nodes access Remote CSMA nodes access ISP through NAT and TCP/IPISP through NAT and TCP/IP

• Remote CSMA nodes can Remote CSMA nodes can also share files and printersalso share files and printers

• Ad hoc peer-peer transfers Ad hoc peer-peer transfers between nodes do not require between nodes do not require resources of “server” PCresources of “server” PC

USB

Voice traffic can also be activeVoice traffic can also be active

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Specification timelineSpecification timeline

‘‘98 Jan98 Jan‘‘98 Q198 Q1

‘‘98 Q298 Q2

‘‘98 Q398 Q3

99 2H99 2H

‘‘98 Q498 Q4

HomeRF Disclosure to Early MembersHomeRF Disclosure to Early MembersHomeRF Working Group AnnouncedHomeRF Working Group Announced

Specification Refinement & PrototypingSpecification Refinement & Prototyping

Early Member Workshop, SWAP Educational SeminarEarly Member Workshop, SWAP Educational Seminar

Developer’s Workshop, Prototype Demo’sDeveloper’s Workshop, Prototype Demo’s

Specification Refinement (Rev 0.7) & PrototypingSpecification Refinement (Rev 0.7) & Prototyping

First Products Expected!First Products Expected!

99 1H99 1H

Compliance WorkshopCompliance Workshop

Rev1.0 Provisional Specification CompleteRev1.0 Provisional Specification Complete

Specification at Rev 0.9Specification at Rev 0.9

First Components ExpectedFirst Components Expected

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HomeRF SummaryHomeRF Summary

Home RF Working group developing oHome RF Working group developing open, royalty free specpen, royalty free spec

Over 60 member companiesOver 60 member companiesNOW is the time to begin implementatiNOW is the time to begin implementati

on planson plansMore info (including membership) at wMore info (including membership) at w

ww.homerf.orgww.homerf.org

Documents

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