Radio communication system, radio communication method, radio base station and control station

Abstract

A radio communication system includes a plurality of radio base stations and a control station connected to the radio base stations. One of the radio base stations notifies state control information including information regarding state control to the control station before or after execution of state control in the one radio base station. The control station notifies at least one of management information regarding the radio parameter updated in accordance with the state control and the state control information to the radio base stations connected to the control station, with the exclusion of the one radio base station that notified the state control information.

1 . A radio communication system comprising:
 a plurality of radio base stations; and   a control station connected to said radio base stations,   wherein on occurrence of a trigger for execution of state control of a first radio base station of said radio base stations in said first radio base station, said first radio base station notifies state control information including information regarding said state control to at least one out of said control station and other radio base stations than said first radio base station, before or at a time of start of said state control or in an execution step of said state control.   
     
     
         2 . The radio communication system according to  claim 1 , wherein said control station sends one or both of
 state control information regarding said first radio base station and   management information regarding a radio parameter to be updated in accordance with said state control of said first radio base station to   at least a second radio base station out of said radio base stations that manages a cell neighboring to a cell of said first radio base station.   
     
     
         3 . A radio communication system comprising:
 a plurality of radio base stations; and   a control station that is connected to said radio base stations and manages said radio base stations,   wherein a first radio base station out of said radio base stations notifies state control information including information regarding said state control to at least one out of said control station and other radio base stations than said first radio base station, before or at a time of start of said state control, or in an execution step of said state control, and   said control station notifies at least one of   management information regarding a radio parameter to be updated in accordance with said state control, and   said state control information   
       to at least a second radio base station out of said radio base stations that are connected to said control station, said second radio base station managing at least a cell neighboring to a cell of said first radio base station. 
     
     
         4 . The radio communication system according to  claim 1 , wherein said control station includes an upper order station managing said radio base stations or a main radio base station performing centralized control for said radio base stations. 
     
     
         5 . The radio communication system according to  claim 1 , wherein said state control includes one out of
 new installation, removal, or relocation of said first radio base station;   transmission on/off at a specified frequency managed by said first radio base station; and   wakeup/sleep of said first radio base station.   
     
     
         6 . The radio communication system according to  claim 5 , wherein said transmission on/off is executed by controlling transmission power in a stepwise manner. 
     
     
         7 . The radio communication system according to  claim 1 , wherein said state control information includes at least one out of
 a result of said state control;   an advance notice of said state control;   a request for said state control;   details of said state control; and   information that is a reference of decision as to whether or not said state control is to be executed.   
     
     
         8 . The radio communication system according to  claim 2 , wherein said management information includes at least one out of
 a configuration value of a radio parameter;   a difference between a configuration value of a radio parameter and a value of said radio parameter before update; and   control information regarding a radio parameter.   
     
     
         9 . The radio communication system according to  claim 8 , wherein said radio parameter includes at least one out of
 a neighbor cell list;   transmission power;   an antenna tilt angle;   a handover parameter; and   a cell reselection parameter.   
     
     
         10 . The radio communication system according to  claim 9 , wherein said second radio base station controls value of said transmission power and/or said antenna tilt angle in a stepwise manner. 
     
     
         11 . The radio communication system according to  claim 9 , wherein said information regarding said neighbor cell list includes information of one out of
 addition to a neighbor cell list of a cell of a radio base station executing said state control;   removal from a neighbor cell list; and   change of an attribute for a cell managed by a radio base station executing said state control.   
     
     
         12 . The radio communication system according to  claim 11 , wherein said attribute in said neighbor cell list includes at least one out of
 there being access restriction present (Black list);   there being no access restriction present (White list):   removal from said neighbor cell list not being possible (No Remove);   handover not being possible (No Handover);   there being no connection between radio base stations;   there being no information exchange between radio base stations (No X2);   transmission off (Tx-off or No Tx); and   sleep (Sleep).   
     
     
         13 . The radio communication system according to  claim 2 , wherein said second radio base station updates said radio parameter based on said management information to notify said update to a radio terminal in an own cell. 
     
     
         14 . The radio communication system according to  claim 2 , wherein said first radio base station notifies said state control information to said control station before executing said state control, and
 said control station notifies state control execution information to said first radio base station after notifying said management information at least to said second radio base station.   
     
     
         15 . The radio communication system according to  claim 14 , wherein said state control execution information includes at least one out of
 an instruction for executing or completing said state control; and   a value of a parameter used for said state control.   
     
     
         16 . A method for radio communication, comprising:
 a first radio base station detecting an occurrence of a trigger for execution of state control of said first radio base station; and   said first radio base station notifying state control information including information regarding said state control to at least one out of a control station connected to said first radio base station and other radio base stations than said first radio base station before or at a time of start of said state control or in an execution step of said state control.   
     
     
         17 . The method according to  claim 16 , comprising:
 said control station sending one or both of said state control information regarding said first radio base station and management information regarding a radio parameter to be updated in accordance with said state control of said first radio base station to at least a second radio base station that manages a cell neighboring to a cell of said first radio base station.   
     
     
         18 . A radio base station comprising:
 a unit that detects an occurrence of a trigger for execution of state control of said radio base station; and   a unit that notifies state control information including information regarding said state control to at least one out of a control station connected to said first radio base station and other radio base stations than said radio base station before or at a time of start of said state control or in an execution step of said state control.   
     
     
         19 . A control station that is connected to a plurality of radio base stations and manages said radio base stations, said control station comprising:
 a unit that receives from a first radio base station of said radio base stations state control information including information regarding state control; and   a unit that transmits at least one or both of   status information regarding said first radio base station, and   management information regarding a radio parameter to be updated in accordance with said state control of said first radio base station to at least a second radio base station that manages a cell neighboring to a cell of said first radio base station.   
     
     
         20 . A method for radio communication, comprising:
 on occurrence of a preset trigger for transmission off or on, in a cell managed by a radio base station (eNB), said radio base station (eNB) requesting a control station (O&M) to switch transmission off or on in said cell; and   said control station (O&M), on receiving said request, changing an attribute in a neighbor relation table (NRT) relevant to a neighboring radio base station (neighboring eNB) of said given radio base station (eNB).   
     
     
         21 . A radio communication system comprising:
 a plurality of radio base stations (eNBs); and   a control station (O&M) connected to said radio base stations,   wherein on occurrence of a preset trigger for transmission off or on in a cell managed by a first radio base station (eNB) of said radio base stations, said first radio base station requests said control station (O&M) to switch transmission in said cell off or on, and
 said control station, on receiving said request, changes an attribute in a neighbor relation table (NRT) relevant to a neighboring radio base station (neighboring eNB) of said first radio base station (eNB).