MOBILE COMMUNICATION METHOD AND GATEWAY DEVICE

• US 20120307795A1
• Filed: 12/03/2010
• Published: 12/06/2012
• Est. Priority Date: 12/04/2009
• Status: Abandoned Application

• Current Assignee: NTT Docomo Incorporated (Nippon Telegraph and Telephone Corporation)
• Original Assignee: NTT Docomo Incorporated (Nippon Telegraph and Telephone Corporation)
• Inventors: Takahashi, Hideaki, Hapsari, Wuri Andarmawanti, Okamoto, Takeshi, Iwamura, Mikio, Ishii, Minami
• Application Number:
  US13/513,775
• Publication Number:
  US 20120307795A1
• Time in Patent Office: Days
• US Class Current: 370/331
• CPC Class Codes: H04W 36/0055 Transmission or use of information for re-establishing the radio link
• CPC Class Codes: H04W 36/0064 of control information between different access points
• CPC Class Codes: H04W 36/08 Reselecting an access point
• CPC Class Codes: H04W 8/082 for traffic bypassing of mobility servers, e.g. location registers, home PLMNs or home agents
• CPC Class Codes: H04W 84/045 using private Base Stations, e.g. femto Base Stations, home Node B
• CPC Class Codes: H04W 92/24 between backbone network devices

Abstract

A handover method according to the present invention includes a step of transmitting, by a radio base station HeNB#1, “HO Request” to a gateway device HeNB-GW#1, the “HO Request” including “Target CGI” capable of uniquely designating a cell #2 and “TAI” capable of designating a tracking area to which the cell #2 belongs, and a step of transmitting, by the gateway device HeNB-GW#1, “HO Request” including the “Target CGI” to a gateway device HeNB-GW#2 designated by an IP address corresponding to the “TAI”.

Claims

1. A method, which allows a handover of a mobile station from a first cell subordinate to a first radio base station accommodated in a first gateway device to a second cell subordinate to a second radio base station accommodated in a second gateway device, the method comprising:

a step of transmitting, by the first radio base station, a handover request signal via X2 interface to the first gateway device, the handover request signal including a cell identifier capable of uniquely designating the second cell and a tracking area identifier capable of designating a tracking area to which the second cell belongs;

a step of transmitting, by the first gateway device, a handover request signal including the cell identifier via X2 interface to the second gateway device designated by the tracking area identifier; and

a step of transmitting, by the second gateway device, a handover request signal including the cell identifier via X2 interface to the second radio base station designated by the cell identifier.

2. A method, which allows a handover of a mobile station from a first cell subordinate to a first radio base station accommodated in a first gateway device to a second cell subordinate to a second radio base station accommodated in a second gateway device, the method comprising:

a step of transmitting, by the first radio base station, a handover request signal via X2 interface to the first gateway device, the handover request signal including a cell identifier capable of uniquely designating the second cell;

a step of transmitting, by the first gateway device, a handover request signal including the cell identifier via X2 interface to the second gateway device designated by the cell identifier; and

a step of transmitting, by the second gateway device, a handover request signal including the cell identifier via X2 interface to the second radio base station designated by the cell identifier.

3. A gateway device, which serves as a first gateway device in a method for allowing a handover of a mobile station from a first cell subordinate to a first radio base station accommodated in the first gateway device to a second cell subordinate to a second radio base station accommodated in a second gateway device, comprising:

a reception unit configured to receive a handover request signal via X2 interface from the first radio base station, the handover request signal including a cell identifier capable of uniquely designating the second cell and a tracking area identifier capable of designating a tracking area to which the second cell belongs; and

a transmission unit configured to transmit a handover request signal including the cell identifier via X2 interface to the second gateway device designated by the tracking area identifier.

4. A gateway device, which serves as a first gateway device in a method for allowing a handover of a mobile station from a first cell subordinate to a first radio base station accommodated in the first gateway device to a second cell subordinate to a second radio base station accommodated in a second gateway device, comprising:

a reception unit configured to receive a handover request signal via X2 interface from the first radio base station, the handover request signal including a cell identifier capable of uniquely designating the second cell; and

a transmission unit configured to transmit a handover request signal including the cell identifier via X2 interface to the second gateway device designated by the cell identifier.