WIRELESS COMMUNICATION SYSTEM, CONTROL CENTER, AND BASE STATION

• US 20100232399A1
• Filed: 02/04/2010
• Published: 09/16/2010
• Est. Priority Date: 03/10/2009
• Status: Active Grant

• Current Assignee: Kabushiki Kaisha Toshiba (Toshiba Corporation)
• Original Assignee: Kabushiki Kaisha Toshiba (Toshiba Corporation)
• Inventors: Yamamoto, Keiji, Negishi, Kazuya
• Granted Patent: US 8,385,298 B2
• Time in Patent Office: Days
• US Class Current: 370/336
• CPC Class Codes: H04W 24/02 Arrangements for optimising operational condition

Abstract

The base station includes a notification module configured to notify a control center of output power data, a measurement module configured to measure a reception quality of each time slot from received radio signals of control data transmitted from other base stations via a control channel, and a transmission module configured to transmit reception quality data indicating the reception quality to the control center, along with data indicating the time slot selected by the base station. The control center includes a reception module configured to receive the output power data, the reception quality data, and the data indicating the time slot, and a construction module configured to construct adjacent base station data indicating adjacency relationship between the base stations by comparing the reception quality and the output power of each of the base stations, the reception quality being obtained by converting the reception quality data based on the time slot.

Claims

1. A wireless communication system comprising a plurality of base stations and a control center, the base station being configured to transmit control data used to service a mobile terminal via a control channel in a time slot selected from plurality of time slots autonomously, the control center being configured to connect to the base station via a transmission path and control the base station, the base station comprising:

a notification module configured to notify the control center of output power data via the transmission path, the output power data indicating an output power of the base station;

a measurement module configured to measure a reception quality of each time slot from received radio signals of control data transmitted from other base stations via the control channel; and

a transmission module configured to transmit reception quality data indicating the reception quality of each time slot to the control center via the transmission path, along with data indicating the time slot selected by the base station,

wherein the control center comprises;

a reception module configured to receive the output power data, the reception quality data, and the data indicating the time slot from the base station; and

a construction module configured to construct adjacent base station data indicating adjacency relationship between the base stations by comparing the reception quality and the output power of each of the base stations, the reception quality being obtained by converting the reception quality data based on the time slot.

2. The system according to claim 1, wherein the reception quality is determined based on a reception power.

3. The system according to claim 1, wherein the reception quality is determined based on an error rate.

4. A control center used in a wireless communication system, the system comprising a plurality of base stations and a control center, the base station being configured to transmit control data used to contain a mobile terminal via a control channel in a time slot selected from plurality of time slots autonomously, the control center being configured to connect to the base station via a transmission path so as to control the base station, the control center comprising:

a reception module configured to receive output power data, reception quality data, and data indicating a time slot, the output power data indicating output power of the base station transmitted via the transmission path from the base station, the reception quality data indicating reception quality of each time slot measured by received radio signals of control data transmitted from other base stations via the control channel, the data indicating the time slot being selected by the base station; and

a construction module configured to construct adjacent base station data indicating adjacency relationship between base stations by comparing the reception quality with the output power of each of the mobile base stations, the reception quality being obtained by converting the reception quality data based on the time slot.

5. The control center according to claim 4, wherein the reception quality is determined based on a reception power.

6. The control center according to claim 4, wherein the reception quality is determined based on an error rate.

7. The control center according to claim 4, wherein the construction module calculates a distance between adjacent base stations based on the reception quality and the output power of each of the base stations.

8. The control center according to claim 4, further comprising a prediction module configured to predict a base station which is a candidate to which hand-over of the mobile terminal is to be conducted, based on the adjacent base station data.

9. The control center according to claim 8, wherein the prediction module selects a base station with the greatest reception power as a candidate to which hand-over of the mobile terminal is to be conducted, based on the adjacent base station data when the reception quality is determined based on the reception power.

10. The control center according to claim 8, wherein the prediction module selects the base station with the lowest error rate as a candidate for the hand-over based on the adjacent base station data when the reception quality is determined based on the error rate.

11. The control center according to claim 8, wherein the prediction module selects a base station that is to be a candidate to which hand-over is to be conducted, based on the adjacent base station data and a vacant spectrum of a communication channel of each of the base stations.

12. A base station used in a wireless communication system comprising a plurality of base stations and a control center, the base station being configured to transmit control data used to contain a mobile terminal via a control channel in a time slot selected from plurality of time slots autonomously, the control center being configured to connect to the base station via a transmission path and control the base station, the base station comprising:

a notification module configured to notify the control center of output power data via the transmission path, the output power data indicating an output power of the base station;

a measurement module configured to measure a reception quality of each time slot from received radio signals of control data transmitted from other base stations via the control channel; and

a transmission module configured to transmit reception quality data indicating the reception quality of each time slot to the control center via the transmission path, along with data indicating the time slot selected by the base station.

13. The system according to claim 12, wherein the reception quality is determined based on a reception power.

14. The system according to claim 12, wherein the reception quality is determined based on an error rate.