Siemens IEEE802.11 Manual do Utilizador descarregar pdf (Página 79)

WLAN-IEEE802.11 Tutorial (Maximilian Riegel), 021018-wlan-tutorial.ppt Page 79 © Siemens, 2002

When you can’t stop them, when you can’t beat them,

then you should join them.

Conclusions for

Mobile Network Operators

n The most complicated and appealing task of a WLAN

operator is charging and billing.

n MNOs have large customer bases, secure

authentication and accounting facilities and they like

to go into mobile business.

n Providing electronic payment services to WLAN

operators can be an important market entry into

mobile business for MNOs.

There is no time to wait!

The WLAN access market is exploding, and WLAN

access may be ‘for free’ in many hot-spots in a few

years (~3-5 years).

1 2 ... 74 75 76 77 78 79 80 81 82 83 84

Maximilian Riegel 1
The ubiquitous WLAN 2
WLAN has taken off 3
Part 1: 5
Internet/Web Applications 6
Layering means encapsulation 7
,QWHUQHW 8
IP based network architecture 9
Wireless LAN IEEE802.11 10
Part 2: IEEE802.11 Overview 12
Wireless IEEE802.11 Standard 13
IEEE802.11 Configurations 14
Wireless LAN Standardization 17
Part 3: Physical layer 18
IEEE802.11 19
AMPLITUDE 20
FREQUENCY 20
Spectrum 21
IEEE802.11a 5GHz PHY Layer 23
IEEE802.11g: Further Speed 24
Extension for the 2.4GHz Band 24
IEEE802.11h: Spectrum and 26
Transmit Power Management 26
… when will 5 GHz WLANs come? 27
PHY Terminology 28
PLCP Protocol Data Unit 29
Part 4: Medium Access Control 30
CSMA/CA Explained 32
CSMA/CA + ACK protocol 33
Station 1 34
Station 2 34
Station 3 34
Station 4 34
“Hidden Node” Provisions 35
IEEE802.11e: MAC Enhancements 36
Contention Free Period 37
Contention Period 37
CFP repetition interval 37
Frame Formats 39
Address Field Description 40
Part 5: MAC layer management 42
Scanning 45
Active Scanning Example 46
Power Management Approach 48
Power Management Procedure 49
MAC Management Frames 50
Part 6: WLAN Mobility 51
IEEE802.11 Ad Hoc Mode 52
Distribution System (DS) 53
ORFDOGLVWULEXWLRQQHWZRUN 54
IEEE802.11f: 55
Part 7: WLAN security 56
• a 40 bit secret key 57
WEP privacy mechanism 58
Shared key authentication 59
IEEE802.11i: 61
Robust Security Network (RSN) 61
Summary: MAC Functionality 63
FXVWRPHUHTXLSPHQW 65
VHOIH[SODLQLQJ 65
Probably to consider … 68
Selection of billing method 69
How does it work: 70
Web based access control 70
GSM/GPRS/UMTS 75
WLAN IEEE802.11 75
WLAN – UMTS Interworking: 76
ORJDULWKPLFVFDOH 78
Conclusions for 79
Mobile Network Operators 79
'+&3 82
SMS containing Password 82

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