Mobile communication method and mobile station

Abstract

A mobile communication method according to the present invention includes a step A of generating and storing, by a mobile station UE in a standby state, a MDT log including predetermined information in a period defined by a “Logged MDT measurement period”, a step B of generating and storing, by the mobile station UE, the MDT log when a standby cell is changed, and a step C of transmitting, by the mobile station UE, the stored MDT log to a radio base station eNB after the mobile station UE is changed to an active state.

The invention claimed is: 
     
       1. A mobile communication method comprising:
 a step A of generating and storing, by a mobile station in a standby state, log information including predetermined information in a predetermined period; 
 a step B of generating and storing, by the mobile station, the log information when a standby cell is changed; and 
 a step C of transmitting, by the mobile station, the stored log information to a radio base station after the mobile station is changed to an active state. 
 
     
     
       2. The mobile communication method according to  claim 1 , wherein, in the step B, the mobile station generates and stores, as the predetermined information, the log information including at least one of identification information of a changed standby cell, radio quality in the changed standby cell, time information, and location information. 
     
     
       3. The mobile communication method according to  claim 1 , wherein, after a time point at which a changed standby cell is initially selected, the mobile station generates and stores the log information in the predetermined period. 
     
     
       4. A mobile station comprising:
 a management unit that generates and stores log information including predetermined information in a predetermined period when the mobile station is in a standby state; and 
 a transmission unit that transmits the stored log information to a radio base station after the mobile station is changed to an active state, wherein 
 when the mobile station changes a standby cell, the management unit is configured to generate and store the log information. 
 
     
     
       5. The mobile station according to  claim 4 , wherein the management unit is configured to generate and store, as the predetermined information, the log information including at least one of identification information of a changed standby cell, radio quality in the changed standby cell, time information, and location information. 
     
     
       6. The mobile station according to  claim 4 , wherein, after a time point at which a changed standby cell is initially selected, the management unit is configured to generate and store the log information, in the predetermined period.