Installation guide

Wi-Fi Location-Based Services—Design and Deployment Considerations

OL-11612-01

Cisco Location-Based Services Architecture

Figure 8 Cisco Location-Based Services Solution Architecture

Access points forward information to WLAN controllers regarding the detected signal strength of any

Wi-Fi clients, 802.11 active RFID tags, rogue access points, or rogue clients. In normal operation, access

points focus their collection activities for this information on their primary channel of operation, going

off-channel and scanning the other channels in the access points regulatory channel set periodically. The

collected information is forwarded to the WLAN controller to which the access point is currently

registered. Each controller manages and aggregates all such signal strength information coming from its

access points. The location appliance uses SNMP to poll each controller for the latest information for

each tracked category of devices. In the case of a location tracking system deployed without a location

appliance, WCS obtains this information from the appropriate controller(s) directly.

An example of this process for the architecture shown in Figure 8 is the flow diagram in Figure 9, which

illustrates the flow of RSSI and tag payload information for Layer 2 (L2) multicasting asset tags such as

the AeroScout T2.

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Wireless Control System

(WCS)

Client Browser

AccessPoint

Third Party Location

Applications

WCS

Server

WLAN Location

Appliance

SOAP/XML

SNMP TRAP

Notifications

SYSLOG

SOAP/XML

SNMP TRAP

AccessPoint

Wi-Fi handsets, clients, rogues and Wi-Fi Tags

HTTPS SOAP/XML

LWAPP

Wireless LAN

Controllers