Patent ID: 9596627
Date: 2017-03-14
CPC Classifications: H04W

Claim:
1. A mobile communication method comprising: a step A of, when communication of a mobile station in a connected state in a first cell under control of a first radio base station is performed through an evolved packet system (EPS) bearer, wherein the EPS bearer is formed of a Data radio bearer between the mobile station and the first radio base station and an S1-U bearer between the first radio base station and a gateway device, and when a second cell under control of a second radio base station is located in a coverage of the first cell and the first radio base station detects that the second cell is located around the mobile station from a result of a radio measurement on the mobile station, causing the first radio base station to send the mobile station a setting change signal containing information correlating identification information on the EPS bearer with identification information on the second cell; a step B of causing the mobile station to set a Data radio bearer between the mobile station and the second radio base station in response to the setting change signal; and a step C of changing the EPS bearer, wherein the EPS bearer is formed of the Data radio bearer between the mobile station and the second radio base station, an S1-U bearer between the second radio base station and the first radio base station, and the S1-U bearer between the first radio base station and the gateway device.