Communications system with transmitting power control and method for the same

• US 7,349,712 B2
• Filed: 01/13/2001
• Issued: 03/25/2008
• Est. Priority Date: 01/31/2001
• Status: Expired due to Fees

• Current Assignee: Mitsubishi Denki Kabushiki Kaisha (Mitsubishi Electric Corporation)
• Original Assignee: Mitsubishi Denki Kabushiki Kaisha (Mitsubishi Electric Corporation)
• Inventors: Yoshimura, Takehiro
• Primary Examiner(s): Anderson; Matthew
• Assistant Examiner(s): Aminzay; Shaima Q.
• Application Number:
  US10/204,407
• Publication Number:
  US 20030013475A1
• Time in Patent Office: 2,628 Days
• Field of Search: 455/522, 455/69, 455/571, 455/572, 455/573, 455/574, 455/450, 455/453, 455/114.3, 455/127.1, 455/127.5, 455/13.4, 455/63.4, 455/56.1, 455/456.5, 455/524, 455/525, 455/560, 455/561, 370/318, 370/311, 370/335, 370/342
• US Class Current: 455/522
• CPC Class Codes: H04W 52/343 taking into account loading or congestion level
• CPC Class Codes: H04W 52/42 in systems with time, space, frequency or polarisation diversity

Abstract

One power control means 14 controls a transmitting power according to a control command to a mobile terminal which accesses one task when radio communication is performed with the mobile terminals in the corresponding sector, and a power control unit 15 gives a control command to each of a plurality of power control means 14 to collectively control the transmitting power to mobile terminals in a plurality of sectors, thereby for accomplishing reduction of interference and elimination of traffic maldistribution in a cell consisting of a plurality of sectors when radio communication is performed with mobile terminals for each sector.

Claims

1. A base station, comprising:

a plurality of transceivers configured to transmit to mobiles in an area, each of said plurality of transceivers configured to transmit in a respective sub-area of said area;

a plurality of transmitting power controllers, each of said plurality of transmitting power controllers controlling transmitting power of a respective one of said plurality of transceivers, each of said plurality of transmitting power controllers controlled with an identical power indicating signal; and

a collective controller for giving said identical power indicating signal to each of said plurality of power controllers.

2. The base station according to claim 1, wherein

said area is a cell, and

said sub-area is a sector of said cell.

3. The base station according to claim 1, wherein

said area is a plurality of cells, and

said sub-area is one of said plurality of cells.

4. The base station according to claim 1, wherein said power controller is configured to control transmitting power of a common pilot channel transmitting power for

each period of a slot which is a predetermined amount of transmit-receive data, or

each period a frame consisting of a plurality of slots.

5. The base station according to claim 1, wherein said collective controller comprises:

means for determining the identical power indicating signal based on a number of mobile terminals serviced by each power controller.

6. The base station according to claim 1, wherein said collective controller comprises:

means for providing said identical power indicating signal to each power controller so as to prevent an absence of transmitting power between adjacent sub-areas and an overlap of transmitting power between adjacent sub-areas.

7. The base station according to claim 1, wherein said collective controller comprises:

means for receiving information concerning a common pilot channel transmitting power in each of said plurality of power controllers, and

means for controlling a reference signal to interference power ratio and a reference number of random access channels in each of said plurality of power controllers.

8. The base station according to claim 1, wherein the collective controller comprises:

means for defining a range of a maximum value and a minimum value of the common pilot channel transmitting power in each of said plurality of power controllers, and

means for controlling within said range, if a power controller autonomously performs power control in one sub-area, the common pilot channel transmitting power of a power controller corresponding to an adjacent sub-area.

9. The base station according to claim 1, wherein

each of said plurality of transmitting power controllers comprises a feedback to said collective controller, and

said collective controller is configured to adjust a power of one transceiver based on feedback from an adjacent transceiver.

10. The base station according to claim 1, wherein each of said plurality of transmitting power controllers comprises:

a power indicating signal input configured to receive the identical power indicating signal from said collective controller;

a reference signal input configured to receive a reference signal from said collective controller;

a feedback signal input configured to receive a feedback signal from a respective mobile;

a comparator connected to each of said reference signal input and said feedback signal input, and configured to output on a comparator output a compare signal based on a comparison of a reference signal and a feedback signal;

a correction amount computer connected to said comparator output and configured to output a transmission power correction signal on a correction amount computer output; and

an adder connected to said power indicating signal input and to said correction amount computer output, and configured to output a transmitting power command signal based on an addition of said transmission power correction signal and said identical power indicating signal.

11. The base station according to claim 1, wherein each of said plurality of transmitting power controllers further comprises:

a collective control feedback configured to relay said transmitting power command signal to said collective controller.

12. A mobile communciations method, comprising;

transmitting from a base station to an area with a plurality of base station transceivers, each of said plurality of base station transceivers transmitting to a respective sub-area of said area; and

controlling transmitting power of each of said plurality of base station transceivers with an identical power indicating signal, each of said plurality of base station transceivers having a respective power controller controlled by said identical power indicating signal.

13. The mobile communications method according to claim 12, wherein

said area is a cell, and

said sub-area is a sector of said cell.

14. The mobile communications method according to claim 12, wherein

said area is a plurality of cells, and

said sub-area is one of said plurality of cells.

15. The mobile communications method according to claim 12, wherein said step of controlling transmitting power comprises:

controlling transmitting power of a common pilot channel transmitting power for each period of a slot which is a predetermined amount of transmit-receive data, or

each period a frame consisting of a plurality of slots.

16. The mobile communications method according to claim 12, wherein said step of controlling transmitting power comprises:

controlling said transmitting power based on a number of mobile terminals serviced by each of said respective power controllers.

17. The mobile communications method according to claim 12, wherein said step of controlling transmitting power comprises:

preventing an absence of transmitting power between adjacent sub-areas and an overlap of transmitting power between adjacent sub-areas.

18. The mobile communications method according to claim 12, wherein said step of controlling transmitting power comprises:

receiving information concerning a common pilot channel transmitting power in each of said respective power controllers, and

controlling a reference signal to interference power ratio and a reference number of random access channels in each of said respective power controllers.

19. The mobile communications method according to claim 12, wherein said step of controlling transmitting power comprises:

defining a range of a maximum value and a minimum value of the common pilot channel transmitting power in each of said respective power controllers, and

controlling within said range, if a power controller autonomously performs power control in one sub-area, the common pilot channel transmitting power of a power controller corresponding to an adjacent sub-area.

20. The mobile communications method according to claim 12, wherein said step of controlling transmitting power comprises:

comparing a feedback signal with a reference signal to provide a comparison signal; and

adjusting said transmitting power based on said comparison signal.