US Patent No. 10,117,276

IMSI ACQUISITION BY BASE STATION CONTROLLER


Patent No. 10,117,276
Issue Date October 30, 2018
Title Imsi Acquisition By Base Station Controller
Inventorship Paul Schliwa-Bertling, Ljungsbro (SE)
Assignee TELEFONAKTIEBOLAGET LM ERICSSON (publ), Stockholm (SE)

Claim of US Patent No. 10,117,276

1. A method implemented at a base station controller of a 3GPP radio access network for retrieving an International Mobile Subscriber Identity (IMSI) number of a wireless device from a mobile switching center, said wireless device engaging in a circuit-switched connection served by the base station controller (BSC) and not configured to support Dual Transfer Mode (DTM), said method comprising:the BSC sending to the mobile switching center (MSC) a first message concerning the wireless device, wherein the wireless device is not configured to support DTM, and wherein the first message comprises information indicating falsely that said wireless device is configured to support DTM even though the wireless device is not configured to support DTM;
the BSC receiving the IMSI number of said wireless device from the MSC;
after receiving the IMSI number of said wireless device, the BSC sending a second message to the MSC, the second message indicating that said wireless device is not configured to support DTM; and
after receiving the IMSI number of said wireless device, the BSC sending to a location function a location update message comprising the IMS number of the wireless device and a BSC identifier (BSC-ID) identifying the BSC.