Received signal quality display method and received signal quality display system

• US 7,529,553 B2
• Filed: 06/13/2006
• Issued: 05/05/2009
• Est. Priority Date: 06/14/2005
• Status: Active Grant

• Current Assignee: NEC Corporation
• Original Assignee: NEC Corporation
• Inventors: Koyanagi, Kenji
• Primary Examiner(s): Nguyen; Lee
• Application Number:
  US11/451,491
• Publication Number:
  US 20060281415A1
• Time in Patent Office: 1,057 Days
• Field of Search: 455/67.11, 455/67.13, 455/67.7, 455/226.1, 455/226.2, 455/226.4, 455/414.2, 455/456.1, 455/457
• US Class Current: 455/457
• CPC Class Codes: H04W 16/18 Network planning tools
• CPC Class Codes: H04W 24/04 Arrangements for maintaining operational condition

Abstract

A base station receives a pilot signal and position information on each of a plurality of mobile stations from the each mobile station. An uplink pilot signal separating unit separates the pilot signal of the each mobile station. A received uplink signal quality calculating unit calculates received signal information on the each mobile station based on the pilot signal of the each mobile station. A position information extracting unit extracts the position information on the each mobile station. A propagation information generating unit generates map information representing the received signal quality at every location by making the position information on the each mobile station correspond to the received signal quality information on the each mobile station. The base station transmits the map information to the each mobile station, and the each mobile station displays the map information.

Claims

1. A received signal quality display method comprising steps of:

causing each of a plurality of mobile stations to transmit an uplink pilot signal and position information that indicates a position at which the each mobile station is present to a base station;

causing the base station to receive the uplink pilot signal and the position information from the each mobile station

causing the base station to calculate received uplink signal quality information based on the uplink pilot signal received from the each mobile station;

causing the base station to generate quality-position correspondence information on the plurality of mobile stations by making the received uplink signal quality information correspond to the position information received from the each mobile station;

causing the base station to transmit the quality-position correspondence information to the each mobile station; and

causing the each mobile station to display an image generated based on the quality-position correspondence information.

2. The received signal quality display method according to claim 1, further comprising steps of:

causing the each mobile station to transmit a mobile station identification number for identifying the each mobile station to the base station;

causing the base station to generate an uplink pilot control signal, in which a correspondence between the each mobile station and a pattern of an uplink pilot signal to be transmitted by the each mobile station is described, based on the mobile station identification number received from the each mobile station; and

causing the base station to transmit the uplink pilot control signal to the each mobile station, wherein

at the step of causing the each mobile station to transmit the uplink pilot signal and the position information indicating the position at which the each mobile station is present to the base station, the each mobile station transmits, as the uplink pilot signal, the uplink pilot signal having the pattern designated by the uplink pilot control signal to the base station.

3. The received signal quality display method according to claim 1, further comprising a step of:

causing the each mobile station to generate map information on a plurality of positions based on the quality-position correspondence information, the map information representing a correspondence between the position and the received uplink signal quality, wherein

at the step of causing the each mobile station to display the image generated based on the quality-position correspondence information, the each mobile station displays, as the image, an image representing the map information.

4. The received signal quality display method according to claim 1, further comprising a step of:

causing the each mobile station to generate map information representing a correspondence between a position and the received uplink signal quality for the position indicated by the map information included in the quality-position correspondence information at each of a plurality of times, wherein

at the step of causing the each mobile station to display the image generated based on the quality-position correspondence information, the each mobile station displays, as the image, an image representing the map information.

5. The received signal quality display method according to claim 1, further comprising a step of:

causing the each mobile station to generate proximate location information indicating a most proximate location to a present position among locations at which a received uplink signal quality represented by the received uplink signal quality information exceeds a predetermined quality, based on the quality-position correspondence information, wherein

at the step of causing the each mobile station to display the image generated based on the quality-position correspondence information, the each mobile station displays, as the image, an image representing the proximate location information.

6. The received signal quality display method according to claim 1, wherein

at the step of causing the base station to calculate the received uplink signal quality information based on the uplink pilot signal received from the each mobile station, the base station calculates, as the received uplink signal quality information, at least one of a received signal power in the base station for the each mobile station and a ratio of the received signal power to an interference power in the base station for the each mobile station.

7. The received signal quality display method according to claim 1, wherein

at the step of causing the each mobile station to transmit the uplink pilot signal and the position information to the base station, the each mobile station transmits the uplink pilot signal and the position information to the base station using a plurality of transmitting antennas based on a multiple-input/multiple-output transmission technique,

at the step of causing the base station to receive the uplink pilot signal and the position information from the each mobile station, the base station receives the uplink pilot signal and the position information using a plurality of receiving antennas based on the multiple-input/multiple-output transmission technique, and

the uplink pilot signal used at the step of causing the base station to calculate the received uplink signal quality information based on the uplink pilot signal received from the each mobile station is a plurality of uplink pilot signals for the each mobile station.

8. The received signal quality display method according to claim 7, wherein

at the step of causing the base station to calculate the received uplink signal quality information based on the uplink pilot signals received from the each mobile station, the base station calculates, as the received uplink signal quality information, at least one of the received signal power in the base station for the each mobile station, the ratio of the received signal power to the interference power in the base station for the each mobile station, a value calculated based on propagation path correlations among the each mobile station and the mobile stations other than the each mobile station for the each mobile station, and correlations among the transmitting antennas in the each mobile station.

9. The received signal quality display method according to claim 7, wherein

at the step of causing the base station to calculate the received uplink signal quality information based on the uplink pilot signals received from the each mobile station, the base station calculates, as the received uplink signal quality information, the received signal power in the base station for the each mobile station or the ratio of the received signal power to the interference power in the base station for the each mobile station, and correlations among the plurality of mobile stations,

the method further comprises a step of causing the base station to generate improvement location information for notifying one of the mobile stations in which the received signal power or the ratio of the received signal power to the interference power is relatively low as compared with the mobile stations other than the one mobile station, of a location at which the correlation is improved based on the quality-position correspondence information, and

at the step of causing the each mobile station to display the image generated based on the quality-position correspondence information, the each mobile station displays, as the image, an image representing the improvement location information.

10. The received signal quality display method according to claim 7, wherein

at the step of causing the base station to calculate the received uplink signal quality information based on the uplink pilot signals received from the each mobile station, the base station calculates, as the received uplink signal quality information, the received signal power in the base station for the each mobile station or the ratio of the received signal power to the interference power in the base station for the each mobile station, and correlations among the plurality of mobile stations,

the method further comprises a step of causing the base station to generate improvement location information for notifying one of the mobile stations in which the received signal power or the ratio of the received signal power to the interference power is relatively low as compared with the mobile stations other than the one mobile station, of a location farthest from the each mobile station in an area in which the received signal power or the ratio of the received signal power to the interference power is equal to or higher than a predetermined value based on the quality-position correspondence information, and

at the step of causing the each mobile station to display the image generated based on the quality-position correspondence information, the each mobile station displays, as the image, an image representing the improvement location information.

11. A received signal quality display method comprising steps of:

causing a base station to transmit a downlink pilot signal to each of a plurality of mobile stations;

causing the each mobile station to receive the downlink pilot signal from the base station;

causing the each mobile station to calculate received downlink signal quality information based on the downlink pilot signal received from the base station;

causing the each mobile station to transmit the received downlink signal quality information and position information indicating a position at which the each mobile station is present to the base station;

causing the base station to generate quality-position correspondence information on the plurality of mobile stations by making the received downlink signal quality information received from the each mobile station correspond to the position information received from the each mobile station;

causing the base station to transmit the quality-position correspondence information to the each mobile station; and

causing the each mobile station to display an image generated based on the quality-position correspondence information.

12. The received signal quality display method according to claim 11, further comprising a step of:

causing the each mobile station to generate map information on a plurality of positions based on the quality-position correspondence information, the map information representing a correspondence between each of the plurality of positions and the received downlink signal quality, wherein

at the step of causing the each mobile station to display the image generated based on the quality-position correspondence information, the each mobile station displays, as the image, an image representing the map information.

13. The received signal quality display method according to claim 11, further comprising a step of:

causing the each mobile station to generate map information on a position indicated by the position information included in the quality-position correspondence information at each of a plurality of times, the map information representing a correspondence between the position and the received downlink signal quality, wherein

at the step of causing the each mobile station to display the image generated based on the quality-position correspondence information, the each mobile station displays, as the image, an image representing the map information.

14. The received signal quality display method according to claim 11, further comprising a step of:

causing the each mobile station to generate proximate location information indicating a most proximate location to a present position among locations at which a received downlink signal quality represented by the received downlink signal quality information exceeds a predetermined quality, based on the quality-position correspondence information, wherein

at the step of causing the each mobile station to display the image generated based on the quality-position correspondence information, the each mobile station displays, as the image, an image representing the proximate location information.

15. The received signal quality display method according to claim 11, wherein

at the step of causing the each mobile station to calculate the received downlink signal quality information based on the downlink pilot signal received from the base station, the each mobile station calculates, as the received downlink signal quality information, at least one of a received signal power in the each mobile station for the each mobile station and a ratio of the received signal power to an interference power in the each mobile station for the each mobile station.

16. The received signal quality display method according to claim 11, wherein

at the step of causing the base station to transmit the downlink pilot signal to the each mobile station, the base station transmits the downlink pilot signal to the each mobile station using a plurality of transmitting antennas based on a multiple-input/multiple-output transmission technique,

at the step of causing the each mobile station to receive the downlink pilot signal from the base station, the each mobile station receives the downlink pilot signal using a plurality of receiving antennas based on the multiple-input/multiple-output transmission technique, and

the downlink pilot signal used at the step of causing the each mobile station to calculate the received downlink signal quality information based on the downlink pilot signal received from the base station is a plurality of downlink pilot signals.

17. The received signal quality display method according to claim 16, wherein

at the step of causing the each mobile station to calculate the received downlink signal quality information based on the downlink pilot signals received from the base station, the each mobile station calculates, as the received downlink signal quality information, at least one of the received signal power in the each mobile station for the each mobile station, the ratio of the received signal power to the interference power in the each mobile station for the each mobile station, and correlations among the transmitting antennas in the base station.

18. The received signal quality display method according to claim 16, wherein

at the step of causing the each mobile station to calculate the received downlink signal quality information based on the downlink pilot signals received from the base station, the each mobile station calculates, as the received downlink signal quality information, the received signal power in the each mobile station for the each mobile station or the ratio of the received signal power to the interference power in the each mobile station for the each mobile station, and correlations among the plurality of mobile stations,

the method further comprises a step of causing the base station to generate improvement location information for notifying one of the mobile stations in which the received signal power or the ratio of the received signal power to the interference power is relatively low as compared with the mobile stations other than the one mobile station, of a location at which the correlation is improved based on the quality-position correspondence information, and

at the step of causing the each mobile station to display the image generated based on the quality-position correspondence information, the each mobile station displays, as the image, an image representing the improvement location information.

19. The received signal quality display method according to claim 16, wherein

at the step of causing the each mobile station to calculate the received downlink signal quality information based on the downlink pilot signals received from the base station, the each mobile station calculates, as the received downlink signal quality information, the received signal power in the each mobile station for the each mobile station or the ratio of the received signal power to the interference power in the each mobile station for the each mobile station, and correlations among the plurality of mobile stations,

the method further comprises a step of causing the base station to generate improvement location information for notifying one of the mobile stations in which the received signal power or the ratio of the received signal power to the interference power is relatively low as compared with the mobile stations other than the one mobile station, of a location farthest from the each mobile station in an area in which the received signal power or the ratio of the received signal power to the interference power is equal to or higher than a predetermined value based on the quality-position correspondence information, and

at the step of causing the each mobile station to display the image generated based on the quality-position correspondence information, the each mobile station displays, as the image, an image representing the improvement location information.

20. A received signal quality display system comprising:

means for transmitting an uplink pilot signal and position information that indicates a position at which the each mobile station is present from the each mobile station to a base station;

means for causing the base station to receive the uplink pilot signal and the position information from the each mobile station

means for causing the base station to calculate received uplink signal quality information based on the uplink pilot signal received from the each mobile station;

means for causing the base station to generate quality-position correspondence information on the plurality of mobile stations by making the received uplink signal quality information on the each mobile station correspond to the position information received from the each mobile station;

means for transmitting the quality-position correspondence information from the base station to the each mobile station; and

means for causing the each mobile station to display an image generated based on the quality-position correspondence information.

21. The received signal quality display system according to claim 20, further comprising:

means for transmitting a mobile station identification number for identifying the each mobile station from the each mobile station to the base station;

means for causing the base station to generate an uplink pilot control signal, in which a correspondence between the each mobile station and a pattern of an uplink pilot signal to be transmitted by the each mobile station is described, based on the mobile station identification number received from the each mobile station; and

means for transmitting the uplink pilot control signal from the base station to the each mobile station, wherein

the means for transmitting the uplink pilot signal and the position information indicating the position at which the each mobile station is present from the each mobile station to the base station transmits, as the uplink pilot signal, the uplink pilot signal having the pattern designated by the uplink pilot control signal to the base station.

22. The received signal quality display system according to claim 20, further comprising:

means for causing the each mobile station to generate map information on a plurality of positions based on the quality-position correspondence information, the map information representing a correspondence between the position and the received uplink signal quality, wherein

the means for causing the each mobile station to display the image generated based on the quality-position correspondence information causes the each mobile station to display, as the image, an image representing the map information.

23. The received signal quality display system according to claim 20, further comprising:

means for causing the each mobile station to generate map information representing a correspondence between a position and the received uplink signal quality for the position indicated by the position information included in the quality-position correspondence information at each of a plurality of times, wherein

the means for causing the each mobile station to display the image generated based on the quality-position correspondence information causes the each mobile station to display, as the image, an image representing the map information.

24. The received signal quality display system according to claim 20, further comprising:

means for causing the each mobile station to generate proximate location information indicating a most proximate location to a present position among locations at which a received uplink signal quality represented by the received uplink signal quality information exceeds a predetermined quality, based on the quality-position correspondence information, wherein

the means for causing the each mobile station to display the image generated based on the quality-position correspondence information causes the each mobile station to display, as the image, an image representing the proximate location information.

25. The received signal quality display system according to claim 20, wherein

the means for causing the base station to calculate the received uplink signal quality information based on the uplink pilot signal received from the each mobile station causes the base station to calculate, as the received uplink signal quality information, at least one of a received signal power in the base station for the each mobile station and a ratio of the received signal power to an interference power in the base station for the each mobile station.

26. The received signal quality display system according to claim 20, wherein

the means for causing the each mobile station to transmit the uplink pilot signal and the position information to the base station causes the each mobile station to transmit the uplink pilot signal and the position information to the base station using a plurality of transmitting antennas based on a multiple-input/multiple-output transmission technique,

the means for causing the base station to receive the uplink pilot signal and the position information from the each mobile station causes the base station to receive the uplink pilot signal and the position information using a plurality of receiving antennas based on the multiple-input/multiple-output transmission technique, and

the uplink pilot signal used by the means for causing the base station to calculate the received uplink signal quality information based on the uplink pilot signal received from the each mobile station is a plurality of uplink pilot signals for the each mobile station.

27. The received signal quality display system according to claim 26, wherein

the means for causing the base station to calculate the received uplink signal quality information based on the uplink pilot signals received from the each mobile station causes the base station to calculate, as the received uplink signal quality information, at least one of the received signal power in the base station for the each mobile station, the ratio of the received signal power to the interference power in the base station for the each mobile station, a value calculated based on propagation path correlations among the each mobile station and the mobile stations other than the each mobile station for the each mobile station, and correlations among the transmitting antennas in the each mobile station.

28. The received signal quality display system according to claim 26, wherein

the means for causing the base station to calculate the received uplink signal quality information based on the uplink pilot signals received from the each mobile station causes the base station to calculate, as the received uplink signal quality information, the received signal power in the base station for the each mobile station or the ratio of the received signal power to the interference power in the base station for the each mobile station, and correlations among the plurality of mobile stations,

the system further comprises means for causing the base station to generate improvement location information for notifying one of the mobile stations in which the received signal power or the ratio of the received signal power to the interference power is relatively low as compared with the mobile stations other than the one mobile station, of a location at which the correlation is improved based on the quality-position correspondence information, and

the means for causing the each mobile station to display the image generated based on the quality-position correspondence information causes the each mobile station to display, as the image, an image representing the improvement location information.

29. The received signal quality display system according to claim 26, wherein

the means for causing the base station to calculate the received uplink signal quality information based on the uplink pilot signals received from the each mobile station causes the base station to calculate, as the received uplink signal quality information, the received signal power in the base station for the each mobile station or the ratio of the received signal power to the interference power in the base station for the each mobile station, and correlations among the plurality of mobile stations,

the system further comprises means for causing the base station to generate improvement location information for notifying one of the mobile stations in which the received signal power or the ratio of the received signal power to the interference power is relatively low as compared with the mobile stations other than the one mobile station, of a location farthest from the each mobile station in an area in which the received signal power or the ratio of the received signal power to the interference power is equal to or higher than a predetermined value based on the quality-position correspondence information, and

the means for causing the each mobile station to display the image generated based on the quality-position correspondence information causes the each mobile station to display, as the image, an image representing the improvement location information.

30. A received signal quality display system comprising:

means for transmitting a downlink pilot signal from a base station to each of a plurality of mobile stations;

means for causing the each mobile station to receive the downlink pilot signal from the base station;

means for causing the each mobile station to calculate received downlink signal quality information based on the downlink pilot signal received from the base station;

means for transmitting the received downlink signal quality information and position information indicating a position at which the each mobile station is present from the each mobile station to the base station;

means for causing the base station to generate quality-position correspondence information on the plurality of mobile stations by making the received downlink signal quality information received from the each mobile station correspond to the position information received from the each mobile station;

means for transmitting the quality-position correspondence information from the base station to the each mobile station; and

means for causing the each mobile station to display an image generated based on the quality-position correspondence information.

31. The received signal quality display system according to claim 30, further comprising:

means for causing the each mobile station to generate map information on a plurality of positions based on the quality-position correspondence information, the map information representing a correspondence between each of the plurality of positions and the received downlink signal quality, wherein

the means for causing the each mobile station to display the image generated based on the quality-position correspondence information causes the each mobile station to display, as the image, an image representing the map information.

32. The received signal quality display system according to claim 30, further comprising:

means for causing the each mobile station to generate map information on a position indicated by the position information included in the quality-position correspondence information at each of a plurality of times, the map information representing a correspondence between the position and the received downlink signal quality, wherein

the means for causing the each mobile station to display the image generated based on the quality-position correspondence information causes the each mobile station to display, as the image, an image representing the map information.

33. The received signal quality display system according to claim 30, further comprising:

means for causing the each mobile station to generate proximate location information indicating a most proximate location to a present position among locations at which a received downlink signal quality represented by the received downlink signal quality information exceeds a predetermined quality, based on the quality-position correspondence information, wherein

the means for causing the each mobile station to display the image generated based on the quality-position correspondence information causes the each mobile station to display, as the image, an image representing the proximate location information.

34. The received signal quality display system according to claim 30, wherein

the means for causing the each mobile station to calculate the received downlink signal quality information based on the downlink pilot signal received from the base station causes the each mobile station to calculate, as the received downlink signal quality information, at least one of a received signal power in the each mobile station for the each mobile station and a ratio of the received signal power to an interference power in the each mobile station for the each mobile station.

35. The received signal quality display system according to claim 30, wherein

the means for causing the base station to transmit the downlink pilot signal to the each mobile station causes the base station to transmit the downlink pilot signal to the each mobile station using a plurality of transmitting antennas based on a multiple-input/multiple-output transmission technique,

the means for causing the each mobile station to receive the downlink pilot signal from the base station causes the each mobile station to receive the downlink pilot signal using a plurality of receiving antennas based on the multiple-input/multiple-output transmission technique, and

the downlink pilot signal used by the means for causing the each mobile station to calculate the received downlink signal quality information based on the downlink pilot signal received from the base station is a plurality of downlink pilot signals.

36. The received signal quality display system according to claim 35, wherein

the means for causing the each mobile station to calculate the received downlink signal quality information based on the downlink pilot signals received from the base station causes the each mobile station to calculate, as the received downlink signal quality information, at least one of the received signal power in the each mobile station for the each mobile station, the ratio of the received signal power to the interference power in the each mobile station for the each mobile station, and correlations among the transmitting antennas in the base station.

37. The received signal quality display system according to claim 35, wherein

the means for causing the each mobile station to calculate the received downlink signal quality information based on the downlink pilot signals received from the base station causes the each mobile station to calculate, as the received downlink signal quality information, the received signal power in the each mobile station for the each mobile station or the ratio of the received signal power to the interference power in the each mobile station for the each mobile station, and correlations among the plurality of mobile stations,

the system further comprises means for causing the base station to generate improvement location information for notifying one of the mobile stations in which the received signal power or the ratio of the received signal power to the interference power is relatively low as compared with the mobile stations other than the one mobile station, of a location at which the correlation is improved based on the quality-position correspondence information, and

the means for causing the each mobile station to display the image generated based on the quality-position correspondence information causes the each mobile station to display, as the image, an image representing the improvement location information.

38. The received signal quality display system according to claim 35, wherein

the means for causing the each mobile station to calculate the received downlink signal quality information based on the downlink pilot signals received from the base station causes the each mobile station to calculate, as the received downlink signal quality information, the received signal power in the each mobile station for the each mobile station or the ratio of the received signal power to the interference power in the each mobile station for the each mobile station, and correlations among the plurality of mobile stations,

the system further comprises means for causing the base station to generate improvement location information for notifying one of the mobile stations in which the received signal power or the ratio of the received signal power to the interference power is relatively low as compared with the mobile stations other than the one mobile station, of a location farthest from the each mobile station in an area in which the received signal power or the ratio of the received signal power to the interference power is equal to or higher than a predetermined value based on the quality-position correspondence information, and

the means for causing the each mobile station to display the image generated based on the quality-position correspondence information causes the each mobile station to display, as the image, an image representing the improvement location information.