Base station apparatus, mobile station apparatus, and radio communication parameter updating method

• US 20070093268A1
• Filed: 10/12/2006
• Published: 04/26/2007
• Est. Priority Date: 10/20/2005
• Status: Active Grant

• Current Assignee: NTT Docomo Incorporated (Nippon Telegraph and Telephone Corporation)
• Original Assignee: NTT Docomo Incorporated (Nippon Telegraph and Telephone Corporation)
• Inventors: Mori, Shinichi, Sugiyama, Takatoshi, Hosono, Hiroyuki
• Granted Patent: US 7,697,936 B2
• Time in Patent Office: Days
• US Class Current: 455/561
• CPC Class Codes: H04W 24/02 Arrangements for optimising operational condition
• CPC Class Codes: H04W 92/20 between access points

Abstract

To provide a base station apparatus that can automatically update the parameters required for radio communication. A pair of identifier for identifying the self station and radio communication parameter is notified to another base station existing in the neighborhood of the self station, and the path loss value between another base station and a mobile station and the pair of identifier and radio communication parameter for another base station is acquired. The pair of identifier and radio communication parameter reported by the self station is set and updated, based on this acquired information. Since it is updated in consideration of the path loss value reported from the mobile station, the parameter can be updated at higher precision.

Claims

1. A base station apparatus comprising:

radio communication parameter notification means for notifying a pair of identifier for identifying a self station and radio communication parameter to another base station in the neighborhood of the self station;

information acquisition means for acquiring at least one of a path loss value between said another base station and a mobile station, a reception level and an arrival time difference between control channels, and the pair of identifier and radio communication parameter for said another base station; and

radio communication report parameter update means for setting and updating the pair of identifier and radio communication parameter reported by the self station, based on the information acquired by said information acquisition means.

2. The base station apparatus according to claim 1, wherein said radio communication report parameter update means sets the pair of identifier and radio communication parameter for the base station having a smaller preset path loss value as the preferentially reported pair, in which if the path loss value is equal, the pair having a greater number of appearances is set as the preferentially reported pair.

3. The base station apparatus according to claim 1, wherein said radio communication report parameter update means sets the pair of identifier and radio communication parameter for the base station having a greater preset number of appearances as the preferentially reported pair, in which if the number of appearances is equal, the pair having a smaller preset path loss value is set as the preferentially reported pair.

4. A base station apparatus comprising:

information acquisition means for acquiring a pair of identifier for identifying a base station and radio communication parameter from a newly established base station that is newly provided; and

radio communication parameter report means for reporting the information acquired by said information acquisition means together with the pair of identifier for identifying the self station and radio communication parameter to a mobile station belonging to a cell formed by the self station.

5. The base station apparatus according to claim 4, further comprising path loss update means for updating the path loss value in said pair of identifier and radio communication parameter based on a measurement report, only if said measurement report including the path loss values in the pairs of identifier and radio communication parameter for said newly established base station and the self station is acquired from said mobile station, and path loss notification means for transmitting the path loss value in the pair of identifier and radio communication parameter reported by the self station to said newly established base station, if said measurement report is acquired.

6. The base station apparatus according to claim 4, further comprising radio communication report parameter notification request means for making a request to said base station to notify all the pairs of identifier and radio communication parameter reported by said base station to said newly established base station, if the path loss values in the pairs of identifier and radio communication parameter for said newly established base station and the base station other than the self station are acquired from said mobile station.

7. The base station apparatus according to claim 5, wherein said path loss update means makes any one of an average value of measurements of said path loss value and a minimum value of said measurements an update value of said path loss value, if said measurement reports are acquired from a plurality of mobile stations.

8. The base station apparatus according to claim 5, wherein said path loss notification means transmits the path loss value in the pair of identifier and radio communication parameter reported by the self station to said newly established base station, if said measurement reports are acquired from a predetermined number of mobile stations.

9. A base station apparatus comprising radio communication report parameter notification response means for notifying all the pairs of identifier and radio communication parameter reported by the self station to said newly established station, if another base station makes a request for notifying all those pairs to said newly established base station that is newly provided.

10. A mobile station apparatus comprising:

path loss measurement means for measuring the path loss value that is a power difference between the transmission power of a base station to which the self station can be connected and the reception power of the self station; and

notification means for notifying the path loss value measured by said path loss measurement means to said base station.

11. In a radio communication system wherein a base station and a mobile station belonging to a cell formed by said base station communicate, said base station automatically setting up a parameter required for radio communication and incorporation into a radio access network when newly established, a radio communication parameter update method for allowing said newly established base station to report a pair of identifier and radio communication parameter for an existent base station that exists to form a cell adjacent to the cell formed by the newly established base station that is newly provided to the mobile station belonging to the cell formed by said newly established base station, comprising:

a step at which the newly established base station sets up the pair of base station identifier and radio communication parameter for the self station;

a step at which said newly established base station notifies the pair of base station identifier and radio communication parameter for the self station to the first existent base station in the neighborhood;

a step at which said first existent base station reports the pair of base station identifier and radio communication parameter for said newly established base station, in addition to the pair of base station identifier and radio communication parameter reported to the mobile station belonging to the cell formed by said first existent base station, to said mobile station, based on a notification of the pair of base station identifier and radio communication parameter from said newly established base station;

a step at which said first existent base station receives a measurement report including the path loss value from said mobile station, said path loss value being a power difference between the transmission power of the base station and the reception power of the mobile station in the pair of identifier and radio communication parameter for the base station to which said mobile station can be connected among all the pairs of identifier and radio communication parameter reported from said first existent base station;

a step at which said first existent base station updates the hold value of the path loss value in the pair of identifier and radio communication parameter based on a measurement report of the path loss values, only if said measurement report including the path loss values in the pairs of identifier and radio communication parameter for both said newly established base station and said first existent base station is received from said mobile station;

a step at which said second existent base station notifies the hold value of the path loss value to said newly established base station, said path loss value being in each of all the pairs of identifier and radio communication parameter reported in the second existent base station receiving the measurement report including the path loss values in the pairs of identifier and radio communication parameter for both the self station and said newly established base station from said mobile station among said first base stations;

a step at which said second existent base station makes a request to the third existent base station to notify all the pairs of identifier and radio communication parameter reported by said third existent base station to said newly established base station, if a measurement report of the path loss values in the pairs of identifier and radio communication parameter for the third existent base station in addition to said newly established base station and said second existent base station is notified from said mobile station to said second existent base station;

a step at which said third existent base station notifies all the pairs of identifier and radio communication parameter reported by said third existent base station to said newly established base station based on said request; and

a step at which said newly established base station updates the pair of identifier and radio communication parameter reported by said newly established base station, based on all the identifiers notified from said second existent base station, the path loss hold value in the radio communication parameter, all the identifiers notified from said third existent base station and said radio communication parameter.