Mobile communication method, mobile station, and radio base station

Patent metadata

Field	Value
Publication number	US-9467331-B2
Application number	US-201214129466-A
Country	US
Kind code	B2
Filing date	Jun 25, 2012
Priority date	Jun 29, 2011
Publication date	Oct 11, 2016
Grant date	Oct 11, 2016

Abstract

A reconnection procedure is successfully performed even when a connection destination radio base station does not manage “UE Context” for a mobile station UE. A mobile communication method according to the present invention includes a step B in which the mobile station UE transmits CGI of cell # 1 to a radio base station eNB# 2 in the reconnection procedure, and a step C in which the radio base station eNB# 2 acquires “UE Context” for the mobile station UE from a radio base station eNB# 1 managing cell # 1 designated based on the CGI when not managing “UE Context” for the mobile station UE in the reconnection procedure.

First claim

The invention claimed is:

1. A mobile communication method comprising:
a step A in which when detecting a radio link failure in a first cell under a first radio base station, a mobile station starts a reconnection procedure for a second radio base station managing a second cell selected in a cell selection processing;
a step B in which the mobile station transmits Cell Global Identity (CGI) of the first cell to the second radio base station in the reconnection procedure; and
a step C in which in the reconnection procedure, when not managing context information of the mobile station, the second radio base station acquires context information of the mobile station from the first radio base station managing the first cell designated based on the CGI,
wherein the step B includes:
a step B1 in which the mobile station transmits transmission enable/disable information indicating whether the CGI of the first cell can be transmitted to the second radio base station via a reconnection request signal;
a step B2 in which when the received transmission enable/disable information indicates that the CGI of the first cell can be transmitted, the second radio base station transmits request information for requesting to transmit the CGI of the first cell to the mobile station via a reconnection signal; and
a step B3 in which the mobile station transmits the CGI of the first cell to the second radio base station via a reconnection complete signal in response to the request information.

2. The mobile communication method according to claim 1 , wherein in the step B3, the mobile station does not perform a security processing on the reconnection complete signal.

3. A mobile station comprising:
a controller configured to start a reconnection procedure for a second radio base station managing a second cell selected in a cell selection processing when detecting a radio link failure in a first cell under a first radio base station; and
a transmitter configured to transmit Cell Global Identity (CGI) of the first cell to the second radio base station in the reconnection procedure,
wherein the transmitter is configured to transmit transmission enable/disable information indicating whether the CGI of the first cell can be transmitted to the second radio base station via a reconnection request signal, and
the transmitter is configured to transmit the CGI of the first cell to the second radio base station via a reconnection complete signal when receiving a reconnection signal containing request information for requesting to transmit the CGI of the first cell from the second radio base station.

4. The mobile station according to claim 3 , wherein the transmitter is configured not to perform a security processing on the reconnection complete signal.

5. A radio base station which operates as a second radio base station when a mobile station starts a reconnection procedure for the second radio base station managing a second cell selected in a cell selection processing when detecting a radio link failure in a first cell under a first radio base station, the radio base station comprising:
a receiver configured to acquire context information of the mobile station from the first radio base station managing the first cell designated based on Cell Global Identity (CGI) of the first cell transmitted by the mobile station when not managing the context information for the mobile station in the reconnection procedure; and
a transmitter configured to transmit request information for requesting to transmit the CGI of the first cell to the mobile station via a reconnection signal when the reception unit receives transmission enable/disable information indicating whether the CGI of the first cell can be transmitted via a reconnection request signal from the mobile station and when the received transmission enable/disable information indicates that the CGI of the first cell can be transmitted.

Assignees

• Hideaki Takahashi
• Iwamura Mikio
• Ntt Docomo Inc

Inventors

• Takahashi Hideaki
• Iwamura Mikio

Classifications

• H04W36/0033 Primary

  with transfer of context information · CPC title

• H04L41/0654 Primary

  using network fault recovery (ring fault isolation or reconfiguration in loop networks without recovery actions by a network management system H04L12/437) · CPC title

• H04W36/36

  by user or terminal equipment · CPC title

• H04W36/305

  Handover due to radio link failure (control signalling for hand-off failure H04W36/0079) · CPC title

• H04L41/0668 Primary

  by dynamic selection of recovery network elements, e.g. replacement by the most appropriate element after failure · CPC title