Method of measuring receive power of CDMA mobile communication system, and CDMA mobile communication system

• US 20060234753A1
• Filed: 04/12/2006
• Published: 10/19/2006
• Est. Priority Date: 04/14/2005
• Status: Active Grant

• Current Assignee: NEC Corporation
• Original Assignee: NEC Corporation
• Inventors: Kondo, Takayuki
• Granted Patent: US 7,565,163 B2
• Time in Patent Office: Days
• US Class Current: 455/522
• CPC Class Codes: H04B 17/318 Received signal strength
• CPC Class Codes: H04W 52/14 Separate analysis of uplink or downlink
• CPC Class Codes: H04W 52/34 TPC management, i.e. sharing limited amount of power among users or channels or data types, e.g. cell loading

Abstract

The receive power of uplink signals in a CDMA mobile communication system is measured by prohibiting a mobile station from transmitting an uplink signal including a frame over a first channel during a predetermined transmission prohibition period, and measuring a receive power of uplink signals at a base station transmitted from each of the mobile stations located in a cell during the prohibition period. Another method of measuring the receive power includes measuring a first receive power of uplink signals at a base station from each mobile station located in a cell, and measuring each second receive power of uplink signal including a frame only over a first channel transmitted from each mobile station, and then calculating a total receive power of uplink signals excluding frames over the first channel by subtracting respective second receive powers from the first receive power.

Claims

1. A method of measuring a receive power of uplink signals of a CDMA mobile communication system, comprising:

prohibiting a mobile station from transmitting an uplink signal including a frame over a first channel during a predetermined transmission prohibition period; and

measuring a receive power of uplink signals, at at least one base station, transmitted from each of one or more mobile stations located in a cell during the predetermined transmission prohibition period.

2. The method of measuring a receive power of uplink signals of a CDMA mobile communication system according to claim 1, wherein, a timing of the predetermined transmission prohibition period is assigned corresponding to each transmit timing of downlink frames transmitted from the at least one base station.

3. The method of measuring a receive power of uplink signals of a CDMA mobile communication system according to claim 2, wherein said at least one base station includes a plurality of base stations, and where in each timing of the predetermined transmission prohibition period assigned by respective base stations of said plurality of base stations is synchronized with each other.

4. The method of measuring a receive power of uplink signals of a CDMA mobile communication system according to claim 2, wherein said at least one base station includes a plurality of base stations, and wherein each timing of the predetermined transmission prohibition period assigned by respective base stations of said plurality of base stations is asynchronous.

5. A method of measuring a receive power of uplink signals of a CDMA mobile communication system, comprising:

measuring a first receive power of uplink signals, at at least one base station, transmitted from each of one or more mobile stations located in a cell;

measuring each second receive power of an uplink signal including a frame only over a first channel, at the at least one base station, transmitted from each of said one or more mobile stations located in the cell; and

calculating a total receive power of uplink signals excluding frames over the first channel by subtracting each second receive power measured in the second measuring step from the first receive power measured in the first measuring step.

6. A method of measuring a receive power of uplink signals of a CDMA mobile communication system, comprising:

receiving first uplink signals and measuring a first receive power of the first uplink signals, at at least one base station, transmitted from each of one or more mobile stations located in the cell;

respreading the first uplink signals for separating each second uplink signal, which is corresponding to each of said one or more mobile stations, from the first uplink signals;

calculating each second receive power of an uplink signal including a frame only over a first channel based on the separated second uplink signal; and

calculating a total receive power of uplink signals excluding frames over the first channel by subtracting each second receive power calculated in the third step from the first receive power measured in the first step.

7. The method of measuring a receive power of uplink signals of a CDMA mobile communication system according to claim 6, wherein the calculating step of the third step comprising, calculating each second receive power of an uplink signal by dividing the separated second uplink signal by a spreading factor used in the CDMA mobile communication system.

8. A CDMA mobile communication system, comprising:

one or more mobile stations communicating with one or more base stations in one or more cells, wherein at least one of said one or more mobile stations is prohibited from transmitting an uplink signal including a frame over a first channel during a predetermined transmission prohibition period; and

at least one of said one or more base stations measuring a receive power of uplink signals transmitted from the at least one of said one or more mobile stations during the predetermined transmission prohibition period.

9. The CDMA mobile communication system according to claim 8, wherein, a timing of the predetermined transmission prohibition period is assigned corresponding to each transmit timing of downlink frames transmitted from the at least one of said one or more base stations.

10. The CDMA mobile communication system according to claim 9, wherein said one or more base stations includes a plurality of base stations, and wherein each timing of the predetermined transmission prohibition period assigned by respective base stations of said plurality of base stations is synchronized with each other.

11. The CDMA mobile communication system according to claim 9, wherein said one or more base stations includes a plurality of base stations, and wherein each timing of the predetermined transmission prohibition period assigned by respective base stations of said plurality of base stations is asynchronous.

12. A CDMA mobile communication system, comprising:

one or more mobile stations communicating with a base station in a cell; and

a base station, which measures a first receive power of uplink signals transmitted from each of the one or more mobile stations located in the cell and each second receive power of uplink signal including a frame only over a first channel transmitted from each of the one or more mobile stations, and calculates a total receive power of uplink signals excluding frames over the first channel by subtracting each second receive power from the first receive power.

13. The CDMA mobile communication system according to claim 12, wherein,

the base station receives first uplink signals and measures a first receive power of the first uplink signals, transmitted from each of one or more mobile stations located in the cell, respreads the first uplink signals for separating each second uplink signal corresponding to each of said one or more mobile stations from the first uplink signals, calculates each second receive power of an uplink signal including a frame only over a first channel based on the separated second uplink signal, and calculates a total receive power of uplink signals excluding frames over the first channel by subtracting each second receive power from the first receive power.

14. A base station for a CDMA mobile communication system, comprising:

a receive power measuring unit, which measures a receive power of uplink signals transmitted from one or more mobile stations located in a cell during a predetermined transmission prohibition period,

wherein a timing of the predetermined transmission prohibition period is assigned corresponding to each transmit timing of downlink frames transmitted from the base station, and the mobile station is prohibited from transmitting an uplink signal including a frame over a predetermined channel during the predetermined transmission prohibition period.

15. A set of base stations for a CDMA mobile communication system, wherein each base station in said set

measures a receive power of uplink signals transmitted from one or more mobile stations located in a cell, and

measures a receive power of uplink signals transmitted from a mobile station located in the cell during a predetermined transmission prohibition period for which the mobile station is prohibited from transmitting an uplink signal including a frame over a first channel, and

wherein a timing of the predetermined transmission prohibition period assigned by a first base station in the set of base stations is synchronized to a timing of a second predetermined transmission prohibition period assigned by a second base station in the set of base stations.

16. A set of base stations for a CDMA mobile communication system, wherein each base station in said set

measures a receive power of uplink signals transmitted from one or mobile stations located in a cell, and

measures a receive power of uplink signals transmitted from a mobile station located in the cell during a predetermined transmission prohibition period for which the mobile station is prohibited from transmitting an uplink signal including a frame over a first channel, and

wherein a timing of the predetermined transmission prohibition period assigned by a first base station in the set of base stations is asynchronous to a timing of a second predetermined transmission prohibition period assigned by a second base in the set of base stations.

17. A base station for a CDMA mobile communication system, comprising:

a receive power measuring unit, which measures a first receive power of uplink signals transmitted from one or more mobile stations located in a cell, and measures each second receive power of an uplink signal including a frame only over a first channel transmitted from one or more mobile stations; and

a receive power calculating unit, which calculates a total receive power of uplink signals excluding frames over the first channel by subtracting each second receive power from the first receive power.

18. A base station for a CDMA mobile communication system, comprising:

a receive power measuring unit, which receives first uplink signals and measuring a first receive power of the first uplink signals transmitted from each of one or more mobile stations located in a cell;

a signal respreading unit, which respreads the first uplink signals for separating each second uplink signal, which is corresponding to each of said one or more mobile stations, from the first uplink signals;

a first calculating unit, which calculates each second receive power of an uplink signal including a frame only over a first channel based on the separated second uplink signal; and

a second calculating unit, which calculates a total receive power of uplink signals excluding frames over the first channel by subtracting each second receive power calculated in the first calculating unit from the first receive power measured in the receive power measuring unit.

19. The base station for a CDMA mobile communication system according to claim 18, wherein, each second receive power of an uplink signal including a frame only over a first channel is calculated by dividing the separated second uplink signal by a spreading factor used in the CDMA mobile communication system.