Patent ID: 9226210
Filing Date: 2015-12-29
Classification: H04W

Abstract:
1. A method comprising: while a wireless communication device (WCD) is being served by a first base station of a first network, detecting a trigger to set up a fallback communication for the WCD to be served by a second network; and responsive to detecting the trigger, (i) determining a second base station of the second network corresponding with the first base station of the first network, wherein the second base station provides service on a plurality of carriers, (ii) identifying, based on current loading on the plurality of carriers, one or more least-loaded carriers of the plurality, and (iii) transmitting from the first base station to the WCD a list of the identified one or more least-loaded carriers, as a directive for the WCD to scan the listed one or more carriers in search of coverage of the second network, wherein an interworking server (IWS) passes signaling between the first network and the second network, and wherein the first network transmits to the IWS an indication of which first base station of the first network is serving the WCD, wherein determining the second base station of the second network corresponding with the first base station of the first network comprises the IWS determining the second base station of the second network corresponding with the first base station of the first network, by reference to data that maps various base stations of the first network with base stations of the second network based on geographic proximity, and wherein identifying the one or more least-loaded carriers of the plurality involves the IWS.