Patent ID: 8849284
Filing Date: 2014-09-30
Classification: H04W

Abstract:
1. 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 via GTP-U tunnel, the downlink data received from the gateway apparatus; transmitting, from the gateway apparatus to the first radio access apparatus, a End Marker message which is GTP-U 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 via GTP-U tunnel, the End Marker 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 End Marker message.