Patent ID: 8583120

Claim:
A method for radio access technology, hereafter called RAT, change for a mobile device, the method comprising: whenever camping on a RAT, collecting cell information for at least one cell; falling back to a first RAT; and performing an offline procedure for moving to the camped RAT from the first RAT according to the collected cell information; wherein the collected cell information includes at least one of a system, a system priority, a public land mobile network (PLMN), frequency information, and a cell identity of the at least one cell, and performing the offline procedure for moving from the first RAT to the camped RAT according to the collected cell information comprises: performing the offline procedure for moving from the first RAT to the camped RAT by the mobile device generating a virtual radio resource control (RRC) connection release message with a virtual redirection information element indicating at least one of the collected cell information.