US 2011/0299465 A1Published application

Mobile communication method and radio base station

AssigneeNtt Docomo, Inc.

InventorsMikio Iwamura, Minami Ishii

Life of this patent

Estimating the term…

Loading patent…

Abstract

A mobile communication method according to the present invention includes performing, at a mobile station UE which establishes a first connection in a first cell, a cell selection process at the time of detecting a failure in the first connection and transmitting, from the mobile station UE to a second cell selected in the cell selection process, a connection re-establishment request signal. The method includes determining, at a radio base station that manages the second cell, whether or not to store context information of the mobile station UE in response to the connection re-establishment request signal and acquiring, at the radio base station, the context information of the mobile station UE from a radio base station that manages the first cell, and establishing a second connection in the second cell for the mobile station UE, based on the context information of the mobile station UE.

Claims3

Dependent claims

A mobile communication method, comprising the steps of:

(A) performing, at mobile station, a cell selection;
(B) transmitting, from the mobile station to a radio base station that manages a selected cell, a random access preamble;
(C) transmitting, from the radio base station to the mobile station, a random access response, in response to the received random access preamble;
(D) transmitting, from the mobile station to the radio base station, an RRC re-establishment request signal by using a resource designated by the random access response;
(E) transmitting, from the radio base station to the mobile station, a contention resolution signal including the RRC re-establishment request signal, in response to the received RRC re-establishment request signal;
(F) transmitting, from the radio base station to the mobile station, a RRC re-establishment signal that is a response message to the RRC re-establishment request signal;
and
(G) receiving, at the mobile station, the contention resolution signal and the RRC re-establishment signal;
wherein
in the step (E) and (F), the radio base station transmits the RRC re-establishment request signal in connection with the contention resolution signal or transmit the RRC re-establishment request signal separately of the contention resolution signal.

7 more elements

Dependencies are inferred from the claim text.