Patent ID: 8346261
Filing Date: 2013-01-01
Classification: H04L,H04W

Abstract:
1. A mobile communication method, in a procedure for a mobile station to perform handover from a first cell under the control of a radio base station of a first radio access scheme to a second cell under the control of a radio base station of a second radio access scheme, the mobile communication method comprising the steps of: (A) transmitting, from a switching center of the first radio access scheme to a switching center of the second radio access scheme, a handover request message including a security processing parameter of a first protocol of the first radio access scheme used in a communication between the mobile station and the switching center of the first radio access scheme and a security processing capability of the mobile station in the second radio access scheme; (B) selecting, at the switching center of the second radio access scheme, a security processing algorithm of a first protocol of the second radio access scheme used in a communication between the mobile station and the switching center of the second radio access scheme, based on the security processing capability of the mobile station in the second radio access scheme; (C) generating, at the switching center of the second radio access scheme, a security processing parameter of the first protocol of the second radio access scheme; (D) transmitting, from the switching center of the second radio access scheme to a radio base station of the second radio access scheme, a handover request message including the security processing capability of the mobile station in the second radio access scheme, the security processing algorithm of the first protocol of the second radio access scheme selected in the step (B) and the security processing parameter of the first protocol of the second radio access scheme; (E) selecting, at the radio base station of the second radio access scheme, a security processing algorithm of a second protocol of the second radio access scheme used in a communication between the mobile station and the radio base station of the second radio access scheme, based on the security processing capability of the mobile station in the second radio access scheme; (F) transmitting, from the radio base station of the second radio access scheme to the switching center of the second radio access scheme, a handover request acknowledge message with a transparent container including the security algorithm of the first protocol of the second radio access scheme, the security processing parameter of the first protocol of the second radio access scheme and the security processing algorithm of the second protocol of the second radio access scheme selected at the step (E); (G) transmitting, from the switching center of the second radio access scheme to the switching center of the first radio access scheme, a message including the transparent container, in response to the received handover request acknowledge message; (H) calculating, at the mobile station upon receiving the transparent container in the first cell, a security processing parameter of the second protocol of the second radio access scheme, by using the security processing algorithm of the first protocol of the second radio access scheme and the security processing parameter of the first protocol of the second radio access scheme; (I) performing, at the mobile station in the second cell, security processing in a communication using the first protocol of the second radio access scheme, by using the security processing algorithm of the first protocol of the second radio access scheme and the security processing parameter of the first protocol of the second radio access scheme; and (J) performing, at the mobile station in the second cell, security processing in a communication using the second protocol of the second radio access scheme, by using the security processing algorithm of the second protocol of the second radio access scheme and the security processing parameter of the second protocol of the second radio access scheme.