Siemens IEEE802.11 Operation instructions

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].
0
5
10
15
20
25
’98 ’99 ’00 ’01 ’02
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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
ip
tcp
http
www
link
phy
ip link
phy
ip
link
phy
ip link
phy
ip
802.2
 link
phy
ip
802.2

ip
tcp
http
www
Peer
(Client) Peer (Web-Server)
802.2
802.3
ip
802.2
802.3
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:/$1$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
ip
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
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[phone] '16 6103
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HQFDS333 $53
W3C
IETF
ITU
ETSI
ATMF
6&73
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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
00
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
ip
ppp
Bluetooth
Netscape
ip
802.2
 802.2  802.3 802.2 802.3 802.2 802.3
http
tcp
ip
ppp
Bluetooth
apache
ip
802.2
802.3
ip
IEEE802.11
local distribution network internet
Client Access Point Access Router Server
Wireless LAN IEEE802.11
basic architecture