BASE STATION AND COMMUNICATIONS METHOD

• US 20070249344A1
• Filed: 04/20/2007
• Published: 10/25/2007
• Est. Priority Date: 04/21/2006
• 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, Hosono, Hiroyuki, Sugiyama, Takatoshi
• Granted Patent: US 7,764,975 B2
• Time in Patent Office: Days
• US Class Current: 455/435.100
• CPC Class Codes: H04W 28/14 using intermediate storage
• CPC Class Codes: H04W 36/00835 Determination of neighbour cell lists
• CPC Class Codes: H04W 48/16 Discovering, processing access restriction or access information
• CPC Class Codes: H04W 72/12 Wireless traffic scheduling
• CPC Class Codes: H04W 8/005 Discovery of network devices, e.g. terminals
• CPC Class Codes: H04W 88/08 Access point devices

Abstract

A base station that communicates with a mobile station includes: a storing unit for storing a predetermined number of base station information, each including a base station ID for discriminating a specific base station and parameter information for radio communications set for the specific base station; an acquisition unit for acquiring a base station ID of other base stations forming a destination cell of the mobile station, or a base station ID of other base station forming a source cell of the mobile station; an aggregating unit for aggregating the number of times that each of the base station IDs is acquired in a first time period; a determination unit for determining a priority of each of the base station IDs on the basis of the aggregated results of the acquisition numbers; a judging unit for judging whether or not there is a base station ID which has a priority higher than the base station ID stored in the storage, and whose acquisition number is larger than a predetermined number of times; and a manager for deleting, from the storage, a base station information including a base station ID having a priority lower than the base station ID judged to have a higher priority, and for storing, in the storage, a base station information including the base station ID judged as to have the higher priority, in a case where the judging unit judges there is the base station ID having a higher priority and whose acquisition number is larger.

Claims

1. A base station that communicates with a mobile station by using radio signals, comprising:

a storage configured to store a predetermined number of base station information, each including a base station ID for discriminating a specific base station and parameter information for radio communications set for the specific base station;

an acquisition unit configured to acquire a base station ID of other base station forming a destination cell of the mobile station, or a base station ID of other base station forming a source cell of the mobile station;

an aggregating unit configured to aggregate the number of times that each of the base station IDs is acquired in a first time period;

a determination unit configured to determine a priority of each of the base station IDs on the basis of the aggregated results of the acquisition numbers;

a judging unit configured to judge among the base station IDs whose acquisition numbers are aggregated whether or not there is a base station ID having a priority higher than the base station ID stored in the storage, and whose acquisition number is larger than a predetermined number of times; and

a manager configured to delete, from the storage, a base station information including a base station ID having a priority lower than the base station ID judged to have a higher priority, and to store, in the storage, a base station information including the base station ID judged to have the higher priority, in a case where the judging unit judges there is the base station ID having a higher priority and whose acquisition number is larger.

2. The base station according to claim 1, wherein the acquisition unit acquires a base station ID when the mobile station hands over or when the mobile station changes a current cell of the mobile station.

3. The base station according to claim 1, wherein, on the basis of location information of the mobile station measured by the mobile station, the acquisition unit acquires the base station ID of one of the other base stations forming a cell corresponding to the measured location information.

4. The base station according to claim 1, wherein

the acquisition unit acquires condition information which indicates conditions in communications between the mobile station and one of the base stations corresponding to the base station ID;

the aggregating unit aggregates the condition information for each base station ID acquired in the first time period; and

the determination unit determines the priority of each of the base station IDs on the basis of the aggregated results of the condition information in addition to the acquisition numbers.

5. The base station according to claim 4, wherein the condition information is any one of a reception level of a radio signal measured by the mobile station and a delay time for communications.

6. The base station according to claim 1, wherein the manager deletes the base station information stored for more than a second time period.

7. A communications method of a base station that communicates with a mobile station by using radio signals, comprising the steps of:

storing a predetermined number of base station information, each including a base station ID for discriminating a specific base station and parameter information for radio communications set for the specific base station;

acquiring a base station ID of other base station forming a destination cell of the mobile station, or a base station ID of other base station forming a source cell of the mobile station;

aggregating the number of times that each of the base station IDs is acquired in a first time period;

determining a priority of each of the base station IDs on the basis of the aggregated results of the acquisition numbers;

judging among the base station IDs whose acquisition numbers are aggregated whether or not there is a base station ID whose priority is higher than the base station IDs stored in the storage, and whose acquisition number is larger than a predetermined number of times; and

deleting, from the storage, a base station information including a base station ID having a priority lower than the base station ID thus judged to have a higher priority, and storing, in the storage, a base station information including the base station ID judged to have the higher priority, in a case where the judging unit judges that there is the base station ID having a higher priority and whose acquisition number is larger.