Terminal transmit power control with link adaptation

• US 8,463,308 B2
• Filed: 10/20/2004
• Issued: 06/11/2013
• Est. Priority Date: 10/20/2004
• Status: Active Grant

• Current Assignee: Four Batons Wireless LLC (Two Gold Capital LLC)
• Original Assignee: Telcordia Technologies Incorporated (Telefonaktiebolaget LM Ericsson), Toshiba Corporation
• Inventors: Matsuo, Ryoko, Obayashi, Shuichi, Kodama, Toshikazu, Famolari, David
• Primary Examiner(s): Maung, Nay A
• Assistant Examiner(s): Perez, Angelica
• Application Number:
  US10/968,244
• Publication Number:
  US 20060084460A1
• Time in Patent Office: 3,156 Days
• Field of Search: 455/522, 455/69, 370/328
• US Class Current: 455/522
• CPC Class Codes: H04W 24/00 Supervisory, monitoring or testing arrangements
• CPC Class Codes: H04W 28/22 Negotiating communication rate
• CPC Class Codes: H04W 52/146 Uplink power control
• CPC Class Codes: H04W 52/22 taking into account previous information or commands
• CPC Class Codes: H04W 52/24 using SIR [Signal to Interference Ratio] or other wireless path parameters
• CPC Class Codes: H04W 52/267 taking into account the information rate
• CPC Class Codes: H04W 52/46 in multi hop networks, e.g. wireless relay networks

Abstract

Methods for coordinating power usage and link adaptation in wireless communications are described. Terminals and/or access points (APs) may attempt to modify terminals'"'"' transmit power in relation to a desired communication data transfer rate. Link adoption may also be used in conjunction with the described methods.

Claims

1. A method for controlling power comprising the steps of:

determining if a change in data rate has occurred;

comparing said current data rate to a previous data rate;

modifying a transmit power of a mobile terminal when said comparing step indicates a change in data rate greater than or equal to a predetermined rate change level; and

determining if a network is at or near capacity,

wherein said modifying step is at least partially based on an outcome of said network determining step.

2. The method according to claim 1, wherein said predetermined rate change level is 2.

3. The method according to claim 1, wherein said determining step determines that said change in data rate has occurred based on a change in data type.

4. A system for modifying transmit power for a mobile terminal transmitting data to an access point comprising:

a processor that determines if a change in data rate has occurred, compares a current data rate to a previous data rate, and modifies said transmit power of said mobile terminal when said change in data rate is greater than or equal to a predetermined data rate change level.

5. The system according to claim 4, wherein said processor is in said mobile terminal.

6. The system according to claim 4, wherein said processor is in said access point.

7. The system according to claim 4, further comprising:

an antenna that transmits said data at an adjusted transmit power level.