System, method, and apparatus for establishing headroom for a mobile station

• US 7,689,239 B2
• Filed: 09/16/2003
• Issued: 03/30/2010
• Est. Priority Date: 09/16/2003
• Status: Active Grant

• Current Assignee: Google Technology Holdings LLC (Alphabet Inc.)
• Original Assignee: Motorola, Inc. (Motorola Solutions, Inc.)
• Inventors: Bi, Hao, Reed, John D.
• Primary Examiner(s): Dean; Raymond S
• Assistant Examiner(s): Urban; Edward F
• Application Number:
  US10/663,103
• Publication Number:
  US 20050059421A1
• Time in Patent Office: 2,387 Days
• Field of Search: 455/69, 455/522, 370/318
• US Class Current: 455/522
• CPC Class Codes: H04L 1/0002 by adapting the transmission rate
• CPC Class Codes: H04W 52/241 taking into account channel quality metrics, e.g. SIR, SNR, CIR, Eb/lo
• CPC Class Codes: H04W 52/248 where transmission power control commands are generated based on a path parameter
• CPC Class Codes: H04W 52/267 taking into account the information rate
• CPC Class Codes: H04W 52/30 using constraints in the total amount of available transmission power
• CPC Class Codes: H04W 52/367 Power values between minimum and maximum limits, e.g. dynamic range

Abstract

A system, method, and apparatus for establishing headroom for a mobile station operating in a wireless communication system by determining (230) a communication channel variance condition and establishing (245) a headroom value based on the communication channel variance condition. The headroom value may be further revised by determining (260) if a battery condition in a mobile station relates to a low battery level and increasing (265) the headroom value in order to decrease the maximum data rate. Modifications to headroom allow data rates to be tailored to specific channel variance conditions and battery conditions.

Claims

1. A method for establishing headroom to provide margin in determining available transmit power value for a mobile station operating in a wireless communication system comprising the steps of:

determining, by the mobile station, a communication channel variance condition, wherein the communication channel variance condition is at least one of a primary pilot power variance, fading period and fade depth estimate, or a peak-to-average estimate within an adaptive measurement interval; and

establishing, by the mobile station, a headroom value based on the communication channel variance condition.

2. A method according to claim 1 wherein the mobile station determines a maximum data rate based on the headroom value and sends the maximum data rate to a base station.

3. A method according to claim 1 wherein the mobile station determines a maximum data rate based on the headroom value and sends a rate adjustment request to a base station.

4. A method according to claim 1 further comprising the steps of:

detecting a battery condition of the mobile station; and

modifying the headroom value based on the battery condition.

5. A method according to claim 4 wherein the step of modifying the headroom value based on the battery condition comprises:

determining if the battery condition relates to a low battery level; and

if the battery condition relates to a low battery level, increasing the headroom value.

6. A method according to claim 1 wherein the step of determining a communication channel variance condition includes measuring a variance in a primary pilot power.

7. A mobile station comprising:

means for determining, by the mobile station, a communication channel variance condition, wherein the communication channel variance condition is at least one of a primary pilot power variance, fading period and fade depth estimate, or a peak-to-average estimate within an adaptive measurement interval; and

means for establishing, by the mobile station, a headroom value based on the communication channel variance condition.

8. A mobile station according to claim 7 further comprising:

means for determining a maximum data rate based on the headroom value; and

means for sending the maximum data rate to a base station.

9. A mobile station according to claim 7 further comprising:

means for determining a maximum data rate based on the headroom value; and

means for sending a rate adjustment request to a base station.

10. A mobile station according to claim 7 further comprising:

means for detecting a battery condition of the mobile station; and

means for modifying the headroom value based on the battery condition.

11. A wireless communication system comprising:

a base station;

at least one mobile station;

means for determining, by the at least one mobile station, a communication channel variance condition, wherein the communication channel variance condition is at least one of a primary pilot power variance, fading period and fade depth estimate, or a peak-to-average estimate within an adaptive measurement interval; and

means for establishing, by the at least one mobile station, a headroom value based on the communication channel variance condition.

12. A wireless communication system according to claim 11 further comprising:

means for determining a data rate based on the headroom value.

13. A wireless communication system according to claim 12 further comprising:

means for sending the data rate between the base station and said at least one mobile station.

14. A wireless communication system according to claim 11 further comprising:

means for determining a battery condition of said at least one mobile station; and

means for modifying the headroom value based on the battery condition.

15. A wireless communication system according to claim 14 further comprising:

means for determining a data rate based on the headroom value; and

means for sending the data rate between said at least one mobile station and the base station.