Global channel power control to minimize spillover in a wireless communication environment

• US 6,341,215 B1
• Filed: 09/20/2000
• Issued: 01/22/2002
• Est. Priority Date: 02/12/1997
• Status: Expired due to Term

• Current Assignee: Interdigital Technology Corporation (InterDigital, Inc.)
• Original Assignee: Interdigital Technology Corporation (InterDigital, Inc.)
• Inventors: Ozluturk, Fatih M.
• Primary Examiner(s): LE, THANH C
• Application Number:
  US09/665,865
• Time in Patent Office: 489 Days
• Field of Search: 455/68, 455/69, 455/70, 455/550, 455/560, 455/561, 455/526, 455/522, 455/126, 455/127, 455/115, 370/321
• US Class Current: 455/69
• CPC Class Codes: H04W 52/24 using SIR [Signal to Interference Ratio] or other wireless path parameters
• CPC Class Codes: H04W 52/246 where the output power of a terminal is based on a path parameter calculated in said terminal
• CPC Class Codes: H04W 52/32 TPC of broadcast or control 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

Abstract

A system which dynamically adjusts the power of signals transmitted from a wireless base station over global channels to minimize spillover to other communication cells monitors the total transmit power of the base station and dynamically adjusts the global channel transmit power as a function of the total transmit power of the base station as measured at the base station.

Claims

1. A transmitter for use in a spread spectrum wireless communication system, the transmitter transmitting a plurality of channels within a shared spectrum including a global channel, the transmitter comprising:

for each channel, a modem for producing a signal associated with that channel;

a signal combiner for combining the produced channel signals as a combined signal;

a radio frequency transmitter for transmitting the combined signal; and

a global channel power control processor for determining a desired transmit power level of the global channel based on in part a transmit power level of the combined signal; and

a power controller associated with the global channel for adjusting a transmit power level of the global channel to be the determined global channel transmit power level.

2. The transmitter of claim 1 located at a base station having an associated cell wherein the determined global channel transmit power level is based on in part the combined signal transmit power level and a distance to an edge of the cell.

3. The transmitter of claim 2 wherein the determined global channel transmit power level is based on in part a free space propagation model.

4. The transmitter of claim 2 wherein the determined global channel transmit power level is based on in part a data propagation model.

5. The transmitter of claim 2 wherein the determined global channel transmit power level is based on in part a break point propagation model.

6. The transmitter of claim 1 wherein the combined signal transmit power level is measured at the radio frequency transmitter.

7. The transmitter of claim 1 wherein the combined signal transmit power level is determined at the signal combiner.

8. The transmitter of claim 1 wherein the combined signal transmit power level is determined at the modems.

9. The transmitter of claim 1 wherein the combined signal transmit power level