Page 316 - ITU-T Focus Group IMT-2020 Deliverables

5 ITU-T Focus Group IMT-2020 Deliverables

A.2 WLAN

WLAN System

WLAN CDR
BOSS Radius Portal
Server Server

WLAN User AP AC
Terminal Internet
Data flow

Figure A-2 – WALN Logical Architecture
As shown in Figure A-2, the WLAN logical system is composed of AP (Access Point), AC (Access Controller),
portal server and radius server.
WLAN access system includes AP and AC mainly used for user access control, charging data collection and
service management. The AP must support 802.11a/b/g/n protocols and ensure compatibility with different
WLAN terminals. The AC is composed of user access control functionality and radio control functionality
logically.

The functionalities of Radius server can be categorized into user data repository, service authentication,
password management, charging and roaming support. The charging information including consumed data
volume, duration and user identifier collected by AC can be transferred periodically to Radius server by Radius
messages, and finally the WLAN CDRs formed by AC are transferred to BOSS (Business and Operation Support
System) for accounting.

The main function of Portal server includes authentication web page push and off line notification.

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