H3C Technologies H3C WX3000E Series Wireless Switches - Manual (Page 205)

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Configuring wireless location
Wireless location overview
NOTE:
Support for this feature depends on your device model.
Wireless location is a technology to locate, track and, monitor specific assets by using WiFi-based Radio
Frequency Identification (RFID) and sensors. APs send collected Tag or MU messages to an AeroScout
Engine (referred to as AE hereinafter). The AE performs location calculation and sends the results to the
graphics software. You can view the location information of the assets in maps, forms, and reports
provided by the software. The graphics software provides search, alert and query functions to facilitate
your operations.
Wireless location can be applied to medical monitoring, asset management, and logistics, helping users
effectively manage and monitor assets.
Architecture of the wireless location system
A wireless location system is composed of three parts: devices or sources to be located, location
information receivers, and location systems.
• Devices or sources to be located include Tags (small, portable RFIDs, which are usually placed or
glued to the assets to be located) of Aero Scout or Mobile Units (MU), and MUs (wireless terminals
or devices running 802.11). The tags and MUs can send wireless messages periodically.
• Location information receivers include 802.11 APs.
• Location systems include the location server, AE calculation software, and different types of
graphics software.
Wireless locating process
A wireless location system can locate wireless clients, APs, rogue APs, rogue clients, Tags and other
devices supporting WLAN protocols. Except Tags, all wireless devices will be identified as MUs by the
wireless location system.
1. Located devices send Tag or MU messages
An RFID sends tag messages that contain channel information over different channels. The RFID
periodically sends messages over the configured channels first and then sends tag messages over
channels 1, 6, and 11 in turn periodically.
Standard wireless devices send MU messages. An MU message does not contain channel
information, so an AP cannot filter MU messages by channel number. The work is done by the
location server by using a certain algorithm and rules.
2. The AP collects Tag and MU messages
The working mode of an AP determines how it collects Tag and MU messages:
{
When the AP operates in monitor mode or hybrid mode, it can locate wireless clients or other
wireless devices that are not associated with it.
{
When the AP operates in normal mode, it can only locate wireless clients associated with it.
The wireless location system considers wireless clients associated with the AP as wireless clients,