Apparatus and method for transmission power balance adjustment in a mobile cellular system

• US 7,738,909 B2
• Filed: 01/14/2009
• Issued: 06/15/2010
• Est. Priority Date: 06/30/2000
• Status: Active Grant

• Current Assignee: NEC Corporation
• Original Assignee: NEC Corporation
• Inventors: Hamabe, Kojiro
• Primary Examiner(s): Gesesse; Tilahun
• Application Number:
  US12/353,811
• Publication Number:
  US 20090131097A1
• Time in Patent Office: 517 Days
• Field of Search: 455/522, 455/69, 455/127.1, 455/422
• US Class Current: 455/522
• CPC Class Codes: H04W 52/367 Power values between minimum and maximum limits, e.g. dynamic range
• CPC Class Codes: H04W 52/40 during macro-diversity or soft handoff
• CPC Class Codes: H04W 52/54 Signalisation aspects of the TPC commands, e.g. frame structure

Abstract

A transmission power control system can establish synchronization by matching adjustment start timings while repeating adjustment periods even when start timings of transmission power balance adjustment are different due to fluctuation of transmission delay of control message from the control station to base station, and can increase circuit capacity by establishing balance of transmission powers between the base stations. In the transmission power control system the base station comprises control means for controlling initiation of a balance adjustment period for performing the balance adjustment from a frame number determined on the basis of frame number of the balance adjustment period.

Claims

1. A transmission power control method in a cellular communication system including a plurality of cells, a plurality of base stations respectively arranged in respective of said plurality of cells, mobile stations located within said cells, and control station provided in common for said plurality of base stations and transmitting control instruction including a balance adjustment period for balance adjustment of transmission power to respective of said mobile stations from said base stations,

wherein assuming that a frame number of transmission frame to said mobile station is CFN and said balance adjustment period is Nperiod frame, said method comprises a step of adding 1 to said CFN every frame and resetting said CFN to zero when said CFN exceeds a maximum value, a step of starting said balance adjustment from the frame of the frame number CFN to be mod (CFN, m Nperiod)=0 (m being a natural number) in response to reception of said control instruction, in each base station, and step of restarting said balance adjustment from the frame of the frame number CFN to be zero, in each base station.

2. The method according to claim 1, further comprises a step of controlling initiation of said balance adjustment period for performing said balance adjustment from a frame number determined on the basis of frame number of the balance adjustment period.

3. A base station in a cellular communication system including a plurality of cells, a plurality of base stations respectively arranged in respective of said plurality of cells, mobile stations located within said cells, and control station provided in common for said plurality of base stations and transmitting control instruction including a balance adjustment period for balance adjustment of transmission power to respective of said mobile stations from said base stations,

wherein assuming that a frame number of transmission frame to said mobile station is CFN and said balance adjustment period is Nperiod frame, said base station comprises means for adding 1 to said CFN every frame and resetting said CFN to zero when said CFN exceeds a maximum value, means for starting said balance adjustment from the frame of the frame number CFN to be mod (CFN, m Nperiod)=0 (m being a natural number) in response to reception of said control instruction, and means for restarting said balance adjustment from the frame of the frame number CFN to be zero.

4. The base station according to claim 3, further comprises means for controlling initiation of said balance adjustment period for performing said balance adjustment from a frame number determined on the basis of frame number of the balance adjustment period.

5. A mobile station in a cellular communication system including a plurality of cells, a plurality of base stations respectively arranged in respective of said plurality of cells, mobile stations located within said cells, and control station provided in common for said plurality of base stations and transmitting control instruction including a balance adjustment period for balance adjustment of transmission power to respective of said mobile stations from said base stations, wherein assuming that a frame number of transmission frame to said mobile station is CFN and said balance adjustment period is Nperiod frame, each base station comprises means for adding 1 to said CFN every frame and resetting said CFN to zero when said CFN exceeds a maximum value, means for starting said balance adjustment from the frame of the frame number CFN to be mod (CFN, m Nperiod)=0 (m being a natural number) in response to reception of said control instruction, and means for restarting said balance adjustment from the frame of the frame number CFN to be zero;

and

said mobile station comprising means for transmitting a control instruction for controlling said transmission power.

6. The mobile station according to claim 5, said each base station further comprises means for controlling initiation of said balance adjustment period for performing said balance adjustment from a frame number determined on the basis of frame number of the balance adjustment period.

7. A transmission power control system in a cellular communication system including a plurality of cells, a plurality of base stations respectively arranged in respective of said plurality of cells, mobile stations located within said cells, and control station provided in common for said plurality of base stations and transmitting control instruction including a balance adjustment period for balance adjustment of transmission power to respective of said mobile stations from said base stations,

wherein assuming that a frame number of transmission frame to said mobile station is CFN and said balance adjustment period is Nperiod frame, each base station comprises means for adding 1 to said CFN every frame and resetting said CFN to zero when said CFN exceeds a maximum value, means for starting said balance adjustment from the frame of the frame number CFN to be mod (CFN, m Nperiod)=0 (m being a natural number) in response to reception of said control instruction;

and means for restarting said balance adjustment from the frame of the frame number CFN to be zero.

8. The transmission power control system according to claim 7, said each base station further comprises means for controlling initiation of said balance adjustment period for performing said balance adjustment from a frame number determined on the basis of frame number of the balance adjustment period.

9. A storage medium storing a transmission power control program in a cellular communication system including a plurality of cells, a plurality of base stations respectively arranged in respective of said plurality of cells, mobile stations located within said cells, and control station provided in common for said plurality of base stations and transmitting control instruction including a balance adjustment period for balance adjustment of transmission power to respective of said mobile stations from said base stations,

wherein assuming that a frame number of transmission frame to said mobile station is CFN and said balance adjustment period is Nperiod frame, said program comprises a step of adding 1 to said CFN every frame and resetting said CFN to zero when said CFN exceeds a maximum value, a step of starting said balance adjustment from the frame of the frame number CFN to be mod (CFN, m Nperiod)=0 (m being a natural number) in response to reception of said control instruction, in each base station, and a step of restarting said balance adjustment from the frame of the frame number CFN to be zero, in each base station.

10. The program according to claim 9, further comprises a step of controlling initiation of said balance adjustment period for performing said balance adjustment from a frame number determined on the basis of frame number of the balance adjustment period.