Transmission power correcting method, mobile communications system and mobile station

• US 6,934,556 B2
• Filed: 08/13/2002
• Issued: 08/23/2005
• Est. Priority Date: 02/06/2002
• Status: Expired due to Fees

• Current Assignee: Mitsubishi Denki Kabushiki Kaisha (Mitsubishi Electric Corporation)
• Original Assignee: Mitsubishi Denki Kabushiki Kaisha (Mitsubishi Electric Corporation)
• Inventors: Takano, Michiaki
• Primary Examiner(s): Corsaro, Nick
• Assistant Examiner(s): TRINH, TAN H
• Application Number:
  US10/216,771
• Publication Number:
  US 20030148780A1
• Time in Patent Office: 1,106 Days
• Field of Search: 455/522, 455/69, 455/67.11, 370/337, 370/329, 370/347, 370/428, 370/392, 370/442
• US Class Current: 455/522
• CPC Class Codes: H04W 52/143 Downlink power control
• CPC Class Codes: H04W 52/24 using SIR [Signal to Interference Ratio] or other wireless path parameters
• CPC Class Codes: H04W 52/241 taking into account channel quality metrics, e.g. SIR, SNR, CIR, Eb/lo
• CPC Class Codes: H04W 52/247 where the output power of a terminal is based on a path parameter sent by another terminal
• CPC Class Codes: H04W 52/262 taking into account adaptive modulation and coding [AMC] scheme AMC per se H04L1/0001
• CPC Class Codes: H04W 52/265 taking into account the quality of service QoS
• CPC Class Codes: H04W 52/267 taking into account the information rate

Abstract

A mobile station in a mobile communications system directs a base station to raise a transmission power using identification data, when a reception quality measured by the mobile station is lower than a desired reception quality. The mobile station also directs the base station to lower the transmission power using identification data, when the reception quality measured by the mobile station is higher than the desired reception quality.

Claims

1. A method of transmission power control, comprising the steps of:

identifying, by a mobile station, a transport block set size to a base station, said transport block set size being based on a quality of a signal transmitted from the base station and received by the mobile station;

identifying, by a mobile station, a transmission power correction value to the base station, wherein said transmission power correction value corresponds to the transport block set size and said transmission power correction value is a negative value when the transport block set size is a predetermined maximum size; and

correcting a transmission power from the base station to the mobile station based on the identified transmission power correction value.

2. The transmission power control method according to claim 1, wherein said step of identifying a transmission power correction value comprises:

identifying the negative value only when the transport block set size to be identified is the predetermined maximum size.

3. The transmission power control method according to claim 2, wherein said step of identifying a transmission power correction value comprises

identifying the transmission power correction value as identification data.

4. The transmission power control method according to claim 1, wherein said step of identifying a transmission power correction value comprises

identifying the transmission power correction value as identification data.

5. A mobile station, comprising:

an identification device configured to identify a transport block set size to a base station, said transport block set size being based on a quality of a signal transmitted from the base station and received by the mobile station; and

an identification device configured to identify a transmission power correction value to the base station, wherein said transmission power correction value corresponds to the transport block set size and said transmission power correction value is a negative value when the transport block set size is a predetermined maximum size.

6. A base station, comprising:

a correction device configured to correct a transmission power from the base station to a mobile station based on a transmission power correction value identified by the mobile, wherein

said transmission power correction value corresponds to a transport block set size,

said transmission power correction value is a negative value when the transport block set size is a predetermined maximum size, and

said transport block set size is based on a quality of a signal transmitted from the base station and received by the mobile station.

7. A mobile communication system, comprising:

a mobile station, said mobile station including

an identification device configured to identify a transport block set size to a base station, said transport block set size being based on a quality of a signal transmitted from the base station and received by the mobile station; and

an identification device configured to identify a transmission power correction value from the mobile station to the base station, wherein said transmission power correction value corresponds to the transport block set size and said transmission power correction value is a negative value when the transport block set size is a predetermined maximum size; and

said base station, said base station including

a correction device configured to correct a transmission power from the base station to the mobile station based on the identified transmission power correction value.