Your SlideShare is downloading. ×
0
Home Rf
Home Rf
Home Rf
Home Rf
Home Rf
Home Rf
Home Rf
Home Rf
Home Rf
Home Rf
Home Rf
Home Rf
Home Rf
Home Rf
Home Rf
Home Rf
Home Rf
Home Rf
Home Rf
Home Rf
Home Rf
Upcoming SlideShare
Loading in...5
×

Thanks for flagging this SlideShare!

Oops! An error has occurred.

×
Saving this for later? Get the SlideShare app to save on your phone or tablet. Read anywhere, anytime – even offline.
Text the download link to your phone
Standard text messaging rates apply

Home Rf

2,424

Published on

Presented by Umesh

Presented by Umesh

Published in: Education, Technology, Business
3 Comments
1 Like
Statistics
Notes
No Downloads
Views
Total Views
2,424
On Slideshare
0
From Embeds
0
Number of Embeds
0
Actions
Shares
0
Downloads
35
Comments
3
Likes
1
Embeds 0
No embeds

Report content
Flagged as inappropriate Flag as inappropriate
Flag as inappropriate

Select your reason for flagging this presentation as inappropriate.

Cancel
No notes for slide

Transcript

  • 1. HomeRF Bringing Wireless Connectivity Home
  • 2. Contents <ul><li>Introduction to Wireless Home Networking </li></ul><ul><li>Brief History of HomeRF </li></ul><ul><li>HomeRF Technology- SWAP </li></ul><ul><li>Summary </li></ul>
  • 3. Overview of HomeRF <ul><li>A next step wireless networking optimized for home/office environment </li></ul><ul><li>Provides Data and Voice communication between devices such as PC’s, Cordless Phones and DSL Modems etc. </li></ul><ul><li>Uses SWAP-CA Technology </li></ul>
  • 4. What is Home Networking ? <ul><li>The distribution of information(Audio, Video, & Data) around the home and their interface with attached devices and external services. </li></ul><ul><li>The interconnection and interoperation of </li></ul><ul><li>- Home appliances </li></ul><ul><li>- Entertainment devices </li></ul><ul><li>PC hardware </li></ul><ul><li>Telecommunication devices </li></ul><ul><li>Security lighting and environmental control systems </li></ul>
  • 5. Wireless Technology <ul><li>Infrared </li></ul><ul><li>-Line-of-Sight Technology </li></ul><ul><li>Radio Frequency </li></ul>
  • 6. HomeRF WG(Working Group) <ul><li>Formed in 1997 with 85+ members </li></ul><ul><li>Enable existence of a broad range of interoperable consumer devices bringing information services to each part of the home </li></ul><ul><li>Establish an open industry specification for unlicensed RF digital communications for PCs and consumer devices anywhere in and around the house </li></ul><ul><li>Initiating members: Compaq, Ericsson, HP, IBM, Intel, Microsoft… </li></ul>
  • 7. HomeRF Vision
  • 8. HomeRF Technology <ul><li>SWAP </li></ul><ul><li>(Shared Wireless Access Protocol) </li></ul><ul><li>Derived from extension of existing cordless Telephone (Digital Enhanced Cordless Telephone) and wireless LAN technology </li></ul>
  • 9. HomeRF Technical Goals <ul><li>Low cost and voice support of DECT </li></ul><ul><li>– Adapted to 2.4GHz band </li></ul><ul><li>– Client call services well defined </li></ul><ul><li>TCP/IP support of IEEE 802.11 </li></ul><ul><li>– Relaxed specs to lower cost </li></ul><ul><li>– Use existing 2.4GHz support (FH) </li></ul>
  • 10. HomeRF Origins 802.11 Uses CSMA/CA Good for data DECT Uses TDMA Good for voice SWAP TDMA+CSMA/CA Good for voice and Data Optimized for small networks(in home) Simplified Radio & Protocol to reduce cost Both Data & Voice are important for HomeRF
  • 11. SWAP <ul><li>HomeRF SWAP specification </li></ul><ul><li>– Designed for both data & voice wireless communication </li></ul><ul><li>– Defines interoperation of PSTN & Internet </li></ul><ul><li>Operates in the 2.4GHz band </li></ul><ul><li>– Uses digital frequency hopping spread spectrum radio </li></ul><ul><li>Derived from extensions of existing cordless telephone (DECT) & wireless LAN technology </li></ul><ul><li>– Enables new class of home cordless services </li></ul><ul><li>IP Data at up to 2 Mbps & support cordless telephony </li></ul>
  • 12. SWAP supports <ul><li>TDMA </li></ul><ul><li>– Time Division Multiple Access </li></ul><ul><li>– Provides delivery of interactive voice & other time critical service </li></ul><ul><li>CSMA/CA </li></ul><ul><li>Carrier Sense Multiple Access/Collision Avoidance </li></ul><ul><li>– Service for delivery of high speed packet data </li></ul>
  • 13. Capabilities of HomeRF <ul><li>Up to 150 foot range </li></ul><ul><li>Networks up to 50 PCs </li></ul><ul><li>Work with dial-up, DSL, and cable modems </li></ul><ul><li>Work through walls & floors </li></ul><ul><li>Data secured through unique network ID </li></ul><ul><li>Robust & reliable & minimizes the impact of radio frequencies </li></ul><ul><li>Includes support of near line quality voice & full telephony </li></ul>
  • 14. Data Service Types <ul><li>Isochronous (I Node) </li></ul><ul><li>– Used mainly to carry interactive voice </li></ul><ul><li>Minimum latency </li></ul><ul><li>Requires the presence of a Connection Point </li></ul><ul><li>– Example: cordless telephones </li></ul><ul><li>Asynchronous (A Node) </li></ul><ul><li>– Used for data networking - TCP/IP traffic </li></ul><ul><li>– Example: fridge pad </li></ul><ul><li>I Nodes get priority on bandwidth </li></ul><ul><li>CP - connection point </li></ul><ul><li>– Can manage a network or act as an A node </li></ul><ul><li>– Can be USB, PCI, PC-Card, Device Bay </li></ul><ul><li>– CP can place calls even when PC is down </li></ul>
  • 15. Frequency Hopping <ul><li>It works very much like its name implies </li></ul><ul><li>-Data signal is modulated with a narrowband carrier signal that hops from frequency to frequency as a function of time over a wide band of frequencies </li></ul><ul><li>-Hopping pattern is known to both transmitter & receiver </li></ul><ul><li> To properly receive the signal the receiver must be set to the same hopping code & listen to the incoming signal at the right time & correct frequency </li></ul><ul><li>Unintended receiver see FH to be short-duration impulse noise </li></ul>
  • 16. Network Layers of HomeRF
  • 17. Network Topology SWAP system supports <ul><li>Ad-Hoc Network </li></ul><ul><li>– Only data communication is supported </li></ul><ul><li>– All stations are equal </li></ul><ul><li>– Control of the network is distributed between the stations </li></ul><ul><li>Managed network under the control of a CP </li></ul><ul><li>– Ideal for isochronous data and power savings </li></ul><ul><li>– Such as time critical communications such as Interactive voice </li></ul><ul><li>– Provides gateway to PSTN </li></ul>
  • 18. Uses <ul><li>PC Enhanced Cordless Telephony </li></ul><ul><li>Mobile Internet viewing </li></ul><ul><li>PC resource sharing </li></ul>
  • 19. Comparative study
  • 20. Technical Summary <ul><li>Hybrid TDMA/CSMA frame </li></ul><ul><li>Frequency Hopping: 50 hops/sec </li></ul><ul><li>Range up to 50 meters indoors </li></ul><ul><li>Speed: dual speed </li></ul><ul><li>– 1 or 2 Mb/sec </li></ul><ul><li>– Also supports TCP/IP voice </li></ul><ul><li>Voice: High quality voice channels with retransmission </li></ul><ul><li>– High quality cordless telephones </li></ul><ul><li>– Voice recognition </li></ul>
  • 21. References <ul><li>XILINX HomeRF Tutorial </li></ul><ul><li>WPAN-HomRF Tutorial from Intel’s Lab </li></ul><ul><li>http://www.palowireless.com/homerf/about.asp </li></ul><ul><li>http://en.wikipedia.org/wiki/HomeRF </li></ul>

×