Base station using reference signal power control

• US 7,085,531 B2
• Filed: 02/10/2003
• Issued: 08/01/2006
• Est. Priority Date: 02/12/1997
• Status: Expired due to Fees

• Current Assignee: Interdigital Technology Corporation (InterDigital, Inc.)
• Original Assignee: Interdigital Technology Corporation (InterDigital, Inc.)
• Inventors: Ozluturk, Fatih M.
• Primary Examiner(s): Nguyen, Simon
• Application Number:
  US10/361,669
• Publication Number:
  US 20030118082A1
• Time in Patent Office: 1,268 Days
• Field of Search: 455/522, 455/69, 455/126, 455/127.1, 455/68, 370/335, 370/318
• US Class Current: 455/39
• CPC Class Codes: H04W 24/00 Supervisory, monitoring or testing arrangements
• CPC Class Codes: H04W 52/143 Downlink power control
• CPC Class Codes: H04W 52/16 Deriving transmission power values from another channel
• CPC Class Codes: H04W 52/24 using SIR [Signal to Interference Ratio] or other wireless path parameters
• CPC Class Codes: H04W 52/32 TPC of broadcast or control channels
• CPC Class Codes: H04W 52/322 Power control of broadcast channels
• CPC Class Codes: H04W 52/343 taking into account loading or congestion level
• CPC Class Codes: H04W 52/346 distributing total power among users or channels
• CPC Class Codes: H04W 84/042 Public Land Mobile systems, e.g. cellular systems
• CPC Class Codes: H04W 88/08 Access point devices

Abstract

A wireless spread spectrum base station has a plurality of modems. The modems produce at least one baseband channel signal and a baseband reference signal. At least one forward power controller controls a power level of the at least one baseband channel signal. A baseband signal combiner combines the at least one baseband channel and baseband reference signals. A radio frequency transmitter modulates to radio frequency and transmits the combined signal. A reference power control processor determines a desired transmit power level of the baseband reference signal to the desired transmit power level.

Claims

1. A wireless spread spectrum base station comprising:

a plurality of modems for producing at least one baseband channel signal and a baseband reference signal;

at least one forward power controller for controlling a power level of the at least one baseband channel signal;

a baseband signal combiner for combining the at least one baseband channel and reference signals;

a radio frequency transmitter for modulating to radio frequency and transmitting the combined signal;

a reference power control processor for determining a desired transmit power level of the baseband reference signal using a transmit power level of the combined signal;

a power controller associated with the baseband reference signal for adjusting a transmit power level of the baseband reference signal to the desired transmit power level.

2. The base station of claim 1 wherein the at least one channel signal is a plurality of channel signals.

3. The base station of claim 1 wherein the desired transmit power level is determined using the combined signal transmit power level and a distance to an edge of the cell.

4. The base station of claim 1 wherein the desired transmit power level is determined using a free space propagation model.

5. The base station of claim 1 wherein the desired transmit power level is determined using a data propagation model.

6. The base station of claim 1 wherein the determined reference channel transmit power is determined using a break point propagation model.

7. The base station of claim 1 wherein the combined transmit power level is measured at the radio frequency transmitter.

8. The base station of claim 1 wherein the combined transmit power level is determined at the signal combiner.

9. The base station of claim 1 wherein the combined signal transmit power level is determined at the modems.

10. The base station of claim 1 wherein the combined signal transmit power level is measured at an antenna external to the base station.

11. The base station of claim 1 wherein the at least one forward power controller controls the power level using a closed-loop algorithm.