Patent ID: 8442534

Claim:
A mobile communication method in which a mobile station receives downlink data from one of a first radio access apparatus within a first radio access network and a second radio access apparatus within a second radio access network, the method comprising the steps of: when a gateway apparatus is switched from a first state where the downlink data is transmitted to the first radio access apparatus to a second state where the downlink data is transmitted to the second radio access apparatus, transferring, from the first radio access apparatus to the second radio access apparatus, the downlink data received from the gateway apparatus; transmitting, from the gateway apparatus to the first radio access apparatus, a specific message indicating that the last downlink data is transmitted, after the gateway apparatus has transmitted the last downlink data; transmitting, from the first radio access apparatus to the second radio access apparatus, the specific message, after the first radio access apparatus has transmitted the last downlink data; transmitting, from the second radio access apparatus to the mobile station, transfer downlink data transferred from the first radio access apparatus, before new downlink data transmitted from the gateway apparatus; and transmitting, from the second radio access apparatus to the mobile station, the new downlink data, after the second radio access apparatus has received the specific message.