Siemens IEEE802.11 Instructions de fonctionnement

Maximilian Riegel

ICM Networks, Advanced Standardization

WLAN-IEEE802.11 Tutorial (Maximilian Riegel), 021018-wlan-tutorial.ppt Page 2 © Siemens, 2002

Prolog:

The ubiquitous WLAN

nToday’s road worriers require access to the Internet

everywhere.

nWLAN is more than just cable replacement, it provides

hassle-free broadband Internet access everywhere.

nCoverage in ‘hot-spots’ sufficient.

nIEEE802.11b meets the expectations for easiness, cost

and bandwidth.

Public

WLAN

Airport

Railway

Station

Campus

Plant

Semi-public

WLAN

Office Hospital

Congress hall,

Hotel

Corporate

WLAN

Office

Home

WLAN

Remote

Access

WLAN-IEEE802.11 Tutorial (Maximilian Riegel), 021018-wlan-tutorial.ppt Page 3 © Siemens, 2002

Prolog:

WLAN has taken off ...

nLots of serious WLAN activities have been started

– All big players have products (Cisco, Intel, …)

– Integrated WLAN solutions appearing (Apple, IBM, ...)

nThe prediction have been exceeded by actual market.

For comparison:

Total PC world market in ‘01: ~ 120 Mio pcs.; > 30 % portable.

nRuling technology is IEEE802.11b (Wi-Fi) [11Mb/s, 2.4 GHz].

’98 ’99 ’00 ’01 ’02

:/$1UILI>PLR@

Source: Frost&Sullivan (2000-03)

WLAN-IEEE802.11 Tutorial (Maximilian Riegel), 021018-wlan-tutorial.ppt Page 4 © Siemens, 2002

Outline

nPart 1: Wireless Internet System Architecture

nPart 2: IEEE802.11 Overview

nPart 3: Physical Layer

nPart 4: Medium Access Control

nPart 5: MAC Layer Management

nPart 6: WLAN Mobility

nPart 7: WLAN Security

nPart 8: Public Hotspot Operations

nPart 9: WLAN – UMTS Interworking

WLAN-IEEE802.11 Tutorial (Maximilian Riegel), 021018-wlan-tutorial.ppt Page 5 © Siemens, 2002

Part 1:

Wireless Internet system architecture

nGeneric Internet network architecture

nLayering means encapsulation

nIEEE802.11 – seamless integration into the Internet

nIP based network architecture

nWireless LAN IEEE802.11 basic architecture

nWhat is unique about wireless?

WLAN-IEEE802.11 Tutorial (Maximilian Riegel), 021018-wlan-tutorial.ppt Page 6 © Siemens, 2002

Internet/Web Applications

Generic Internet network architecture

link

phy

tcp

http

www

link

phy

ip link

phy

link

phy

ip link

phy

802.2

 link

phy

802.2



tcp

http

www

Peer

(Client) Peer

(Web-Server)

802.2

802.3

802.2

802.3

3ROLF\6HUYHU $$$6HUYHU

:/$1$FFHVV

WLAN-IEEE802.11 Tutorial (Maximilian Riegel), 021018-wlan-tutorial.ppt Page 7 © Siemens, 2002

user data

appl. header

tcp header application data

ip header

Ethernet ip header tcp header appl. header user data

HTML

http

tcp

802.2

TCP segment

IP datagramm

Ethernet frame

64 - 1500 bytes

14 bytes 20 bytes 20 bytes

Layering means encapsulation

WLAN-IEEE802.11 Tutorial (Maximilian Riegel), 021018-wlan-tutorial.ppt Page 8 © Siemens, 2002

IEEE802.11 - seamless integration into

the Internet

KWPO [PO [VO VPLO



   

+773 )73 6073 '16 6103

7&3

6'+ *60$70,6'1

1)6

8'3

HQFDS333 $53

W3C

IETF

ITU

ETSI

ATMF

6&73

08$

,QWHUQHW

www

WLAN-IEEE802.11 Tutorial (Maximilian Riegel), 021018-wlan-tutorial.ppt Page 9 © Siemens, 2002

link

phy

link

phy link

phy

link

phy link

phy

link

phy link

phy

link

phy

tcp

http

www

tcp

http

www

IP based network architecture

ipip ipip ipip ipip

N-DATA.request N-DATA.indication

N-DATA N-DATA N-DATA

ip = connectionless,

non-reliable,

end-to-end,

packet-oriented

data delivery service

193.175.26.92 131.34.3.35

Version Length Type of Service Total Length

Identification

)/$*6

Fragment offset

Time-to-live Protocol Header checksum

Source IP Address (32bit)

Destination IP Address (32 bit)

Options (if any)

1234

Data

RTD

D: Delay

T: Throughput

R: Reliability

“1”= precedent

TOS (pre-diffserv)

WLAN-IEEE802.11 Tutorial (Maximilian Riegel), 021018-wlan-tutorial.ppt Page 10 © Siemens, 2002

http

tcp

ppp

Bluetooth

Netscape

802.2

 802.2

 802.3 802.2

802.3 802.2

802.3

http

tcp

ppp

Bluetooth

apache

802.2

802.3

IEEE802.11

local distribution network internet

Client Access Point Access Router Server

Wireless LAN IEEE802.11

basic architecture

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