US Patent No. 10,342,061

RADIO COMMUNICATION SYSTEM AND CONTROL METHOD


Patent No. 10,342,061
Issue Date July 02, 2019
Title Radio Communication System And Control Method
Inventorship Jinho Kim, Tokyo (JP)
Hiroto Yasuda, Tokyo (JP)
Yasufumi Morioka, Tokyo (JP)
Hideaki Takahashi, Tokyo (JP)
Junichiro Hagiwara, Tokyo (JP)
Hiroyuki Ishii, Palo Alto, CA (US)
Assignee NTT DOCOMO, INC., Tokyo (JP)

Claim of US Patent No. 10,342,061

1. A radio communication system comprising:at least one user equipment;
multiple base stations comprising a first base station that executes radio resource control of the user equipment through a control path, and a second base station that does not execute radio resource control of the user equipment;
multiple gateways comprising a first gateway connected with the first base station, and a second gateway connected with the second base station; and
a switching station that controls establishment of user paths among nodes,
the switching station comprising:
a switching station controller that decides whether or not a gateway through which communication executed by the user equipment should be routed is the first gateway,
wherein the switching station controller further, in a case in which the user equipment has executed communication via a logical session involving a first user path established between the second gateway and the second base station and a second user path established between the second base station and the user equipment, and in a case in which the switching station controller decides that the gateway through which communication executed by the user equipment should be routed is the first gateway, controls the first base station so as to release the second user path and so as to establish a third user path between the user equipment and the first base station,
the first base station comprising:
a first base station controller that controls the user equipment so as to establish the third user path on the basis of control by the switching station controller,
wherein the switching station controller controls the second gateway and the second base station so as to release the first user path after establishment of the third user path,
wherein the switching station controller transmits a second user path modification request message to the first base station in a case in which the switching station controller decides that the gateway through which communication executed by the user equipment should be routed is the second gateway, the second user path modification request message requesting release of the second user path,
wherein the first base station controller transmits a radio setting message to the user equipment upon receiving the second user path modification request message, the radio setting message requesting release of the second user path,
wherein the user equipment comprises a user equipment controller that, upon receiving the radio setting message, releases the second user path and transmits a radio setting completion message to the first base station, the radio setting completion message indicating that the second user path has been released and requesting establishment of the third user path, and
wherein the first base station controller establishes the third user path between the first base station and the user equipment, and transmits to the switching station a second user path modification response message indicating that the third user path has been established.