The WLAN location information consists of the TWAN Identifier IE as described in 29 274 V11.6.0 (2013-04) and is sent in GTPv2 ‟create session request” message. If present, this IE carries BSSID (MAC address of the AP) and the SSID. WLAN-GW learns the AP’s MAC@ from calling-station-id attribute in the RADIUS messages from the AP (both authentication and accounting messages) or from circuit-id in DHCP DISCOVER or REQUEST messages. The IE is only sent at session creation time. Therefore, it reports location on initial attach, on handover from LTE to WIFI, and on AP mobility across WLAN-GWs. Mobility across APs anchored on the same WLAN-GW does not result in location update. 3GPP Release 11 does not define location update mechanism for S2a.
By default, location is not reported. It can be enabled with CLI.
config>subscr-mgmt>gtp
peer-profile "pgw-west-mn01"
[no] report-wlan-location