Inter-node synchronization method in radio network system, radio control server, and radio bearer server

A radio control server that exchanges a control message with a radio bearer server, manages a plurality of radio base stations, and controls a radio line of a control plane, the radio bearer server controlling a data transfer between a mobile terminal and a user plane, the radio control server comprising:

• a node synchronization processor that executes a node synchronization processing for node synchronization between the radio control server and the radio bearer server based on a difference between time information held by the radio control server when exchanging the control message with the radio bearer server and time information included in the control message from the radio bearer server.

A radio bearer server that transmits, to a radio control server, a response message to a control message from the radio control server and controls a data transfer between a mobile terminal and a user plane, the radio control server managing a plurality of radio base stations and controlling a radio line of a control plane, wherein

• in transmitting the response message to the control message including first time information transmitted from the radio control server, the radio bearer server adds second time information indicating a time of receiving the control message, third time information indicating a time of transmitting the response message, and the first time information to the response message, and transmits the response message to the radio control server, thereby enabling the radio control server to execute a node synchronization processing,
• wherein a difference in time information between each of the radio base stations and the radio bearer server, acquired by the radio bearer server by the node synchronization processing for node synchronization with each radio base station, is added to the second time information and the third time information.

A radio bearer server that exchanges a control message with a radio control server and controls a data transfer between a mobile terminal and a user plane, the radio control server managing a plurality of radio base stations and controlling a radio line of a control plane, and the radio bearer server comprising:

• a node synchronization processor that executes a node synchronization processing for node synchronization between the radio bearer server and the radio control server based on a difference between time information, which is held by the radio bearer server and which is acquired when the control message is exchanged between the radio bearer server and the radio control server, and time information, which is included in the control message from the radio control server.

A radio control server that exchanges a first control message for indicating transfer of a new call with a radio bearer server, manages a plurality of base stations, and controls a radio line of a control plane, the radio bearer server controlling a data transfer between a mobile terminal and a user plane, and the radio control server comprising:

• a monitoring timer that monitors whether the radio control server does not transmit or receive the first control message to or from the radio bearer server for a certain time or more;
• and
• a node synchronization processor that, if the monitoring timer detects that the first control message is not transmitted or received for a certain time or more, exchanges a predetermined second control message for node synchronization with the radio bearer server, and that executes a node synchronization processing for the node synchronization with the radio bearer server based on a difference between time information, which is held by the radio control server and which is acquired by the radio control server when the second control message is exchanged, and time information, which is included in the second control message from the radio bearer server.

A radio bearer server that exchanges a first control message for indicating transfer of a new call with a radio control server, and controls a data transfer between a mobile terminal and a user plane, the radio control server managing a plurality of base stations and controlling a radio line of a control plane, and the radio bearer server comprising:

• a monitoring timer that monitors whether the radio bearer server does not transmit or receive the first control message to or from the radio control server for a certain time or more;
• and
• a node synchronization processor that, if the monitoring timer detects that the first control message is not transmitted or received for a certain time or more, exchanges a predetermined second control message for node synchronization with the radio control server, and that executes a node synchronization processing for the node synchronization with the radio control server based on a difference between time information, which is held by the radio bearer server and which is acquired by the radio bearer server when the second control message is exchanged, and time information, which is included in the second control message from the radio control server.