Patent ID: 8291625
Filing Date: 2012-10-23
Classification: H04W

Abstract:
1. A method for transmitting inter-radio access technology (RAT) information for inter-RAT handover, the method comprising: receiving, at a mobile station, a super frame header (SFH) including a broadcast channel (BCH), a flag indicating whether the inter-RAT information is transmitted in a current superframe and a start frame number (SFN) field indicating a predetermined frame at which the inter-RAT information is transmitted, wherein the flag is allocated to the BCH; and when the flag is set, acquiring the inter-RAT information at the predetermined frame which is included in the current superframe, wherein if the flag indicates that the inter-RAT information is not transmitted in the current superframe, the method further comprises: transmitting, at the mobile station, a request message requesting the inter-RAT information to a base station, the request message including an urgent information field indicating whether acquisition of the inter-RAT information is urgent; and receiving, at the mobile station, a response message including the inter-RAT information from the base station, wherein the inter-RAT information is acquired by the base station from a target network information server, if the base station does not include the inter-RAT information.