Method and apparatus for performing fast power control in a mobile communication system

• US 6,035,209 A
• Filed: 10/27/1997
• Issued: 03/07/2000
• Est. Priority Date: 03/31/1995
• Status: Expired due to Term

• Current Assignee: Qualcomm, Inc.
• Original Assignee: Qualcomm, Inc.
• Inventors: Tiedemann, Edward G. Jr., Wheatley, Charles E. III, Odenwalder, Joseph P., Padovani, Roberto
• Primary Examiner(s): Eisenzopf, Reinhard J.
• Assistant Examiner(s): Kincaid, Lester G.
• Application Number:
  US08/958,882
• Time in Patent Office: 862 Days
• Field of Search: 455/522, 455/69, 455/70, 455/68, 455/126, 455/127, 455/115, 455/13.4, 455/574, 455/343, 370/311
• US Class Current: 455/522
• CPC Class Codes: H04W 52/08 Closed loop power control
• CPC Class Codes: H04W 52/20 using error rate
• CPC Class Codes: H04W 52/228 using past power values or information
• 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 52/28 using user profile, e.g. mobile speed, priority or network state, e.g. standby, idle or non transmission
• CPC Class Codes: H04W 52/282 taking into account the speed of the mobile
• CPC Class Codes: H04W 52/283 Power depending on the position of the mobile
• CPC Class Codes: H04W 52/362 Aspects of the step size
• CPC Class Codes: H04W 52/367 Power values between minimum and maximum limits, e.g. dynamic range
• CPC Class Codes: H04W 52/50 at the moment of starting communication in a multiple access environment
• CPC Class Codes: H04W 52/60 using different transmission rates for TPC commands

Abstract

A method and apparatus for controlling transmission power in a mobile communication system, which provides for a closed-loop power control method. A mobile station provides information on the quality of the signal received from the base station, and the base station responds by adjusting the power allocated to that user in a shared base station signal. The transmission power is adjusted initially by a large increment and then ramped down at an increasingly decreasing rate. The mobile station also provides information to the base station as to its relative velocity and the base station adjusts its transmission power in accordance with this velocity information.

Claims

1. An apparatus for controlling transmission power from a central communications station comprising:

receiver means for receiving a signal from a remote station;

transmitter means for adjusting a transmission power in accordance with said received signal wherein following a transmission power increase, reducing said transmission power at a first nonzero predetermined rate for a predetermined time period and reducing said transmission power at a second nonzero predetermined rate which is unequal to said first predetermined rate following said predetermined time period.

2. The apparatus of claim 1 wherein said received signal is a power control message generated by said remote station.

3. The apparatus of claim 1 wherein said received signal is a motion message generated by said remote station.

4. The apparatus of claim 1 wherein said receiver means is further for measuring a Doppler shift in said received signal and wherein said transmitter means is for adjusting the transmission power level in accordance with said measured Doppler shift.

5. The apparatus of claim 1 further comprising a decoder means for decoding said received signal and for generating a quality estimate in accordance with said decoded signal and wherein said transmitter means is for adjusting the transmission power level in accordance with said quality estimate.

6. The apparatus of claim 1 wherein said receiver means is further for measuring received signal power and wherein said transmitter means is for adjusting the transmission power level in accordance with said received signal power.