Transmission power control method in wireless mobile device

• US 20040009782A1
• Filed: 02/13/2003
• Published: 01/15/2004
• Est. Priority Date: 09/03/2001
• Status: Abandoned Application

• Current Assignee: Mitsubishi Denki Kabushiki Kaisha (Mitsubishi Electric Corporation)
• Original Assignee: Mitsubishi Denki Kabushiki Kaisha (Mitsubishi Electric Corporation)
• Inventors: Shimizu, Hirokazu
• Application Number:
  US10/344,005
• Publication Number:
  US 20040009782A1
• Time in Patent Office: Days
• US Class Current: 455/522
• CPC Class Codes: H04W 52/08 Closed loop power control
• CPC Class Codes: H04W 52/146 Uplink power control
• CPC Class Codes: H04W 52/228 using past power values or information
• CPC Class Codes: H04W 52/283 Power depending on the position of the mobile
• CPC Class Codes: H04W 52/285 taking into account the mobility of the user
• CPC Class Codes: H04W 52/36 with a discrete range or set of values, e.g. step size, ramping or offsets

Abstract

In code division multiple access (CDMA) mobile communications system in handing-over allowing wireless mobile station to be connected to a plurality of base stations simultaneously the mobile station uses transmission power control (TPC) information received from each base station to control transmission power and when the information is not reliable (SP1) a link'"'"'s quality (a signal to interference ratio (SIR)) is compared with a threshold and until the quality exceeds the threshold and the information recovers in reliability the transmission power is controlled to have a fixed level to present the transmission power from attaining maximal transmission power (SP2).

Claims

1. A method of transmission power control in code division multiple access wireless mobile station receiving information of said transmission power control from a base station and using said information to control transmission power of said mobile station, characterized in that when said information is not reliable said transmission power of said mobile station is controlled to have a constant level lower than maximal transmission power (SP1, SP2).

2. The method according to claim 1, characterized in that a quality of a link receiving data from said base station is based on to detect reliability of said information.

3. A method of transmission power control in code division multiple access wireless mobile station receiving information of said transmission power control from a base station and using said information to control transmission power of said mobile station, characterized in that when said information is not reliable said transmission power of said mobile station is controlled to have a constant level lower than immediately preceding transmission power (SP1, SP2).

4. The method according to claim 3, characterized in that a quality of a link receiving data from said base station is based on to detect reliability of said information.

5. A method of transmission power control in code division multiple access wireless mobile station receiving information of said transmission power control from a base station and using said to control transmission power of said mobile station, characterized in that when said information is not reliable said transmission power of said mobile station is controlled to have a level lower than maximal transmission power and higher than immediately preceding transmission power of said mobile station (SP1, SP2).

6. The method according to claim 5, characterized in that a quality of a link receiving data from said base station is based on to detect reliability of said information.

7. A method of transmission power control in code division multiple access wireless mobile station receiving information of said transmission power control from a base station and using said to control transmission power of said mobile station, characterized in that when said information is not reliable an evaluated propagation environment is based on to control said transmission power of said mobile station (SP1, SP2).

8. The method according to claim 7, characterized in that said environment is evaluated from any of a distance of said mobile station from said base station;

variation of a level of reception from said base station;

mobility of said mobile station;

phasing;

delay spread; and

quality of a link.

9. The method according to claim 7, characterized in that a quality of a link receiving data from said base station is based on to detect reliability of said information.