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

• US 7,697,936 B2
• Filed: 10/12/2006
• Issued: 04/13/2010
• Est. Priority Date: 10/20/2005
• Status: Expired due to Fees

• Current Assignee: NTT Docomo Incorporated (Nippon Telegraph and Telephone Corporation)
• Original Assignee: NTT Docomo Incorporated (Nippon Telegraph and Telephone Corporation)
• Inventors: Mori, Shinichi, Hosono, Hiroyuki, Sugiyama, Takatoshi
• Primary Examiner(s): Eng; George
• Assistant Examiner(s): HUYNH, NAM TRUNG
• Application Number:
  US11/546,414
• Publication Number:
  US 20070093268A1
• Time in Patent Office: 1,279 Days
• Field of Search: 370/320, 370/328, 370/329, 370/342, 370332-335, 455423-425, 455446-449, 455450-453, 455/561
• US Class Current: 455/446
• 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 an identifier for identifying the base station apparatus and a radio communication parameter for identifying the base station apparatus to another base station in the neighborhood of the base station apparatus;

information acquisition means for acquiring information about at least one of a path loss value, a reception level and an arrival time difference over a control channel, and also acquiring another pair of another identifier for identifying said another base station apparatus and another radio communication parameter for identifying said another base station apparatus, the path loss value being a difference between a transmission power of said another base station apparatus and a reception power of a mobile station; and

radio communication report parameter update means for setting and updating the pair of the identifier and the radio communication parameter to be reported by the base station apparatus, based on the information acquired by said information acquisition means;

wherein said radio communication report parameter update means sets a pair, having a smaller preset path lost value, out of the pairs of the identifiers and the radio communications parameters, as a preferentially reported pair, and if the path loss values of the pairs are equal, said radio communication report parameter update means sets a pair having a greater number of appearances as the preferentially reported pair.

6. A mobile station apparatus configured to communicate with the base station apparatus according to any one of claims 1, 2, 3 and 4, the mobile station apparatus comprising:

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

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

2. A base station apparatus, comprising:

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

information acquisition means for acquiring information about at least one of a path loss value, a reception level and an arrival time difference over a control channel, and also acquiring another pair of another identifier for identifying said another base station apparatus and another radio communication parameter for identifying said another base station apparatus, the path loss value being a difference between a transmission power of said another base station apparatus and a reception power of a mobile station; and

radio communication report parameter update means for setting and updating the pair of the identifier and the radio communication parameter to be reported by the base station apparatus, based on the information acquired by said information acquisition means;

wherein said radio communication report parameter update means sets a pair, having a smaller preset path lost value, out of the pairs of the identifiers and the radio communications parameters, as a preferentially reported pair, and if the numbers of appearances are equal, said radio communication report parameter update means sets a pair having a smaller preset path loss value as the preferentially reported pair.

3. A base station apparatus, comprising:

information acquisition means for acquiring, from a newly established base station apparatus that is a second base station apparatus, information about at least one of a path loss value, a reception level and an arrival time difference over a control channel, and also acquiring second information about a second pair of a second identifier for identifying the second base station apparatus and a second radio communication parameter for identifying the second base station apparatus, the path loss value being a difference between a transmission power of the second base station apparatus and a reception power of a mobile station;

radio communication parameter report means for reporting the second information acquired by said information acquisition means together with a first pair of a first identifier for identifying the first base station apparatus and a first radio communication parameter for identifying the first base station apparatus to a mobile station belonging to a cell formed by the first base station apparatus;

path loss update means for updating a path loss value in said first pair of the first identifier and the first radio communication parameter based on a measurement report, only when the measurement report, including path loss values of the first pair of the first identifier and the first radio communication parameter and the second pair of the second identifier and the second radio communication parameter, is acquired from said mobile station, and

path loss notification means for transmitting the path loss value in the first pair of the first identifier and the first radio communication parameter reported by the first base station apparatus to the second base station apparatus, when said measurement report is acquired;

wherein said path loss update means sets 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, when said measurement reports are acquired from a plurality of mobile stations.

5. A base station apparatus according to claim 3 or claim 4, further comprising:

radio communication report parameter notification response means for notifying to a newly established base station apparatus that is a second base station apparatus all pairs of identifiers and radio communication parameters that have been reported by the first base station apparatus when another base station apparatus that is a third base station apparatus other than the first and second base station apparatuses makes a request for notifying all the pairs to said second base station apparatus.

9. The base station apparatus according to claim 3 or claim 4, further comprising:

radio communication report parameter notification request means for making a request to another base station apparatus that is a third base station apparatus other than the first and second base station apparatuses, to notify to the second base station apparatus all pairs of identifiers and radio communication parameters reported by said third base station apparatus, when a path loss value in a third pair of a third identifier for indicating the third base station apparatus and a third radio communication parameter for indicating the third base station apparatus are acquired from said mobile station.

4. A base station apparatus, comprising:

information acquisition means for acquiring, from a newly established base station apparatus that is a second base station apparatus, information about at least one of a path loss value, a reception level and an arrival time difference over a control channel, and also acquiring second information about a second pair of a second identifier for identifying the second base station apparatus and a second radio communication parameter for identifying the second base station apparatus, the path loss value being a difference between a transmission power of the second base station apparatus and a reception power of a mobile station;

radio communication parameter report means for reporting the second information acquired by said information acquisition means together with a first pair of a first identifier for identifying the first base station apparatus and a first radio communication parameter for identifying the first base station apparatus to a mobile station belonging to a cell formed by the first base station apparatus;

path loss update means for updating a path loss value in said first pair of the first identifier and the first radio communication parameter based on a measurement report, only when the measurement report, including path loss values of the first pair of the first identifier and the first radio communication parameter and the second pair of the second identifier and the second radio communication parameter, is acquired from said mobile station; and

path loss notification means for transmitting the path loss value in the first pair of the first identifier and the first radio communication parameter reported by the first base station apparatus to the second base station apparatus, when said measurement report is acquired;

wherein said path loss notification means transmits the path loss value in the first pair of the first identifier and the first radio communication parameter that have been reported by the first base station apparatus to said second base station apparatus, when said measurement reports are acquired from a predetermined number of mobile stations.

7. A radio communication parameter updating method, comprising:

notifying a pair of an identifier for identifying a base station apparatus and a radio communication parameter for identifying the base station apparatus to another base station apparatus in the neighborhood of the base station apparatus;

acquiring information about at least one of a path loss value, a reception level and an arrival time difference over a control channel, and also acquiring another pair of another identifier for identifying said another base station apparatus and another radio communication parameter for identifying said another base station apparatus, the path loss value being the difference between a transmission power of said another base station apparatus and a reception power of a mobile station; and

setting and updating the pair of the identifier and the radio communication parameter to be reported by the base station apparatus, based on the information acquired,

wherein the setting and updating step sets a pair, having a smaller preset path lost value, out of the pairs of the identifiers and the radio communication parameters, as a preferentially reporting pair, and if the path loss values of the pairs are equal, the setting and updating step sets a pair having a greater number of appearances, as the preferentially reported pair.

8. A radio communication parameter updating method applied to a radio communication system having a base station apparatus that is a first base station apparatus, the method comprising:

acquiring, from a newly established base station apparatus that is a second base station apparatus, information about at least one of a path loss value, a reception level and an arrival time difference over a control channel, and also acquiring second information about a second pair of a second identifier for identifying the second base station apparatus and a second radio communication parameter for identifying the second base station apparatus, the path loss value being the difference between a transmission power of the second base station apparatus and a reception power of a mobile station;

reporting the second information acquired together with a first pair of a first identifier for identifying the first base station apparatus and a first radio communication parameter for identifying the first base station apparatus, to a mobile station belonging to a cell formed by the first base station apparatus;

updating a path loss value in said first pair of first identifier and the first radio communication parameter based on a measurement report, only when the measurement report, including path loss values of the first pair of the first identifier and the first radio communication parameter and the second pair of the second identifier and the second radio communication parameter, is acquired from the mobile station; and

transmitting the path loss value in the first pair of the first identifier and the first radio communication parameter reported by the first base station apparatus to the second base station apparatus, when said measurement report is acquired,

wherein the updating step sets any one of an average value of measurements of said path loss value and a minimum value of said measurements to an update value of said path loss value, when said measurement reports are acquired from a plurality of mobile stations.

10. A radio communication parameter updating method comprising:

notifying a pair of an identifier for identifying a base station apparatus and a radio communication parameter for identifying the base station apparatus to another base station apparatus in the neighborhood of the base station apparatus;

acquiring information about at least one of a path loss value, a reception level and an arrival time difference over a control channel, and also acquiring another pair of another identifier for identifying said another base station apparatus and another radio communication parameter for identifying said another base station apparatus, the path loss value being a difference between a transmission power of said another base station apparatus and reception power of a mobile station; and

setting and updating the air of the identifier and the radio communication parameter to be reported by the base station apparatus, based on the information acquired;

wherein the setting and updating step sets a pair, having a greater number of appearances, out of the pairs of the identifiers and the radio communication parameters, as a preferentially reported pair, and if the numbers of appearance are equal, the setting and updating step sets a pair having a smaller preset path loss value, as the preferentially reported pair.

11. A radio communication parameter updating method applied to a radio communication system having a base station apparatus that is a first base station apparatus, the method comprising:

acquiring, from a newly established base station apparatus that is a second base station apparatus, information about at least one of a path loss value, a reception level and an arrival time difference over a control channel, and also acquiring second information about a second pair of a second identifier for identifying the second base station apparatus and a second radio communication parameter for identifying the second base station apparatus, the path loss value being a difference between a transmission power of the second base station apparatus and a reception power of a mobile station;

reporting the second information acquired together with a first pair of a first identifier for identifying the first base station apparatus and a first radio communication parameter for identifying the first base station apparatus, to a mobile station belonging to a cell formed by the first base station apparatus;

updating a path loss value in said first pair of the first identifier and the first radio communication parameter based on a measurement report, only when the measurement report, including path loss values of the first pair of first identifier and the first radio communication parameter and the second pair of the second identifier and the second radio communication parameter, is acquired from the mobile station; and

transmitting the path loss value in the first pair of the first identifier and the first radio communication parameter reported by the first base station apparatus to the second base station apparatus, when said measurement report is acquired;

wherein the transmitting step transmits the path loss value in the first pair of the first identifier and the first radio communication parameter that have been reported by the first base station apparatus to said second base station apparatus, when said measurement reports are acquired from a predetermined number of mobile stations.