Marcin Michalak STC-ULB STC Seminar – May 24th Internet in your pocket Big network in small devices Marcin Michalak [email protected]

STC Seminar – May 24th Marcin Michalakhttp://www.ngnlab.org

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Internet in your pocket

Big network in small devices

Marcin [email protected]


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Agenda

• PDA – Personal Digital Assistant• Wireless networks: types and specs:

– WLAN– Bluetooth– GPRS

• Equipment list• Experiments:

– Bluetooth/GPRS/IrDA/IPv6– audio/video/web browsing/chatting


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iPAQ – what is it?• product from COMPAQ (HPQ)• 206 MHz strongARM processor• 64MB RAM, 32 MB Flash ROM• IrDA, Bluetooth• 320x240 colour touch screen• audio in/out• secure digital (SD) card slot• expansion modules• VGA output expansion

(presentations...)


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0

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12

Mpbs

GPRS Bluetooth WLAN

Wireless technologies - overview

• WLAN – Wireless Ethernet (802.11b)

• Bluetooth – short range, small devices

• GPRS – extension of mobile networks


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Wireless LAN

• Wireless Ethernet• up to 11Mbps• IEEE 802.11b standard• Access points + PCI/PCMCIA cards


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Bluetooth overview

• small, cheap & simple(goal:1 unit<$10)• low power consumption (batteries...)• 2.4 GHz ISM band (unlicensed)• 79 channels, frequency hopping• speed up to 721 kbps• open standard• supported by 1000s of manufacturers• (not just) IrDA replacement

Wireless connection for all mobile devices


STC-ULBFrequency Hopping principle

time

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enc

y

1600 hops / second !!!

79 c

han

nels


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Piconet• Star Topology

– 1 Master, up to 7 active slaves– Unlimited number of parked

slaves

• Master:– determines hopping scheme

and timing– Administers piconet (polling)

• Logical Channels– Asynchronous, packet oriented

- ACL– Synchronous, connection-

oriented (voice, slot reservation) - SCO

M1

5

3

4

6

2

7

P

P

P

P

n

Master

active slaveparked slavestandby

M


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Scatternet

M

M

M

• multiple piconets• overlapping coverage areas• one master / piconet• master for one piconet may be slave for another piconet• each piconet has its own hopping scheme


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Scatternet

M

M

M

• multiple piconets• overlapping coverage areas• one master / piconet• master for one piconet may be slave for another piconet• each piconet has its own hopping scheme


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Bluetooth equipment

• built in: notebooks, PDAs, mobile phones, cameras, pens…

• PCMCIA cards, USB adapters, motherboards

• printer adapters• hands-free


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Bluetooth - applications

• connecting devices in short range:– hands-free to phone– transfer pictures from camera to PC/printer– connect to Internet– phone2phone: send business card– cordless phone (like DECT)– send/receive files (LAN)

• how? -> SDP – service discovery protocolhttp://www.ics.agh.edu.pl/~mmich/ - Master’s Thesis


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GPRS

• extension to GSM network• packet-based transmission• volume-based charging• always-on connectivity• multi-slot operation• up to 171 kbps download

General Packet Radio Services


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GPRS – what’s the trick?

1 2 3 4 5 6 7 8

2G: GSM: 8 Time slots (TS)

one user = one time slot = one call

speed: 9.6 kbps (14.4 kbps extended)

1 2 3 4 5 6 7 82 6 7

one user = many slots assigned on demand

2,5 G: GPRS: 8 Time slots (TS)

speed: up to 171.2 kbps (8 x 21.4 kbps)


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What we have:iPAQ 3870 with Bluetooth and

Linux

Ericsson T39m with

GPRS & Bluetooth

3Com Bluetooth USB adapter

notebook with Linux

and Windows

3Com Bluetooth PCMCIA card

CompaqWLAN PCMCIA card

CompaqWLAN Access Point

iPAQ 3660with PocketWindows


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Demos - list

• basic connectivity: GPRS– Windows with IrDA/Bluetooth (notebook/iPAQ)– Linux with Bluetooth (iPAQ)

• web browsing (iihe, ngnlab, ...)• audio & video transfer

– Windows: Media Player + PocketTV– Linux: vic (IPv6), rat + scream (audio), gaim

• IPv6 – setting up the Freenet6 tunnel (iPAQ)

• iPAQ Linux applications


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Task 0 (easy): Notebook with GPRS

• always-on connectivity• like Dial-UP (speed as well...)• IrDA or Bluetooth• PIN: 1111• let me do it myself...

GSM/GPRSnetwork

Internet

IrDA

wwwmail


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Task 1: iPAQ to GPRSiPAQ:• turn on iPAQ 3660• tap the flag• choose ‘Settings’• tap ‘Connections’ tab• tap ‘Connections’ icon• make sure ‘gprs proximus’ is chosenPhone:• Extras/4 Infrared Port/On• place it next to (above) iPAQiPAQ:• tap ‘Connect’ button• wait... and use


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Task 2: Use and enjoy

• web browsing: Internet Explorer• multimedia:

– playing MP3 files– Windows Media Player (4FM, videos)– PocketTV – live feed

• check e-mail, chat, ...

Note: check phone battery after usage (infrared)


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OK, let’s get serious...

• Linux on iPAQ 3870 (X-Windows incl.)

• Bluetooth working (uffff....)• GPRS connection via Bluetooth• Bluetooth connection via notebook

GPRS


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Task 3: Connect to phone/GPRS

• prepare the phone• run: rfcommd –n –f /etc/rfcommdGPRS.conf na 00:80:37:11:8f:ed

short: ./GPRS

• see the output– on the phone (slide down)– on iPAQ

• remarks:– Bluetooth emulates serial connection (like IrDA)– GPRS service: extra request @operator needed


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Task 4: IPv6 connectivity• Freenet6.net service – free & everybody• works on Windows NT, 2000, Linux, FreeBSD• your computer may also be a router!• run on iPAQ:

tspc• run: ifconfig• run:

ping6 www.kame.netping6 www.6bone.netping6 www.ipv6.iihe.ac.be


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IPv6 tunnel – how it works?

Freenet6 [email protected]

IPv6

Internet

GSM/GPRSnetwork

IPv6-in-IPv4 tunnel

• connection to Internet IPv4 via Bluetooth & GPRS• IPv6-over-IPv4 tunnel to Freenet6• connection to EURODEMO through Canada...


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Task 5: Bluetooth connection

• notebook as a router• Bluetooth USB Adapter• connection up to 721kbps• run:

./NBtspc (another IPv6 tunnel)

• check if works (ifconfig, ping)• next step is...


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Task 6: Applications

• web browsing with dillo• playing audio – scream• listening to the radio online• vic and rat over IPv4/IPv6• gaim – chat• and more...


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dillo – web browser

• Menu/Viewers/dillo• F/Open URL...• browse your favourites


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scream – audio player

• play mp3 files• listen to the radio

online:– Mode-> Icecast– Server tab/+/choose


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vic and rat• let’s try...• IPv4: webmail PC & iPAQ• IPv6 (vic): Isabel PC & iPAQ

IPv4

193.190.246.20(webmail)

193.190.247.35

193.190.247.433ffe:b80:2:883f::c1be:f72b

193.190.246.154 (Isabel)3ffe:b80:ca5:1:260:97ff:fe25:e8d8


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gaim – chatting...

• supports:– ICQ– IRC– MSN– Yahoo

• feel like talking?


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Questions?

Documents

Marcin Michalak STC-ULB STC Seminar – May 24th Internet in your pocket Big network in small devices Marcin Michalak [email protected]