Patent ID: 8576799

Claim:
A mobile communication method in which a mobile station performs communication via a first connection between the mobile station and a radio base station and a second connection between the radio base station and a switching center by use of a first protocol function and a second protocol function, wherein the first protocol function performs processing corresponding to a first protocol which terminates between the mobile station and the radio base station; the second protocol function performs processing corresponding to a second protocol which is an upper protocol of the first protocol and terminates between the mobile station and the switching center; and the method comprises the steps of: transmitting, from the first protocol function to a second radio base station which manages a cell detected by performing a cell search, a connection reestablishment request, after detecting a “Radio Link Failure” in a first connection established between the first protocol function and a first radio base station; transmitting, from the second radio base station to the first protocol function, a connection reestablishment reject, when the second radio base station receives the connection reestablishment request; and transmitting, a service request by the second protocol function when the first protocol function receives the connection reestablishment reject.