Method and system for power-conserving interference avoidance in communication between a mobile unit and a base unit in a wireless telecommunication system

• US 7,224,745 B2
• Filed: 06/18/2001
• Issued: 05/29/2007
• Est. Priority Date: 11/19/1999
• Status: Expired due to Term

• Current Assignee: Siemens AG
• Original Assignee: Siemens Communications Incorporated (Siemens AG)
• Inventors: Sydon, Uwe, Sastrodjojo, Paulus, Guan, Sheng, Kockmann, Juergen
• Primary Examiner(s): Corrielus; Jean B.
• Application Number:
  US09/884,415
• Publication Number:
  US 20010028685A1
• Time in Patent Office: 2,171 Days
• Field of Search: 375/130, 375/132, 375/227, 375/228, 375/259, 375/285, 375/296, 375/346, 375/348, 455/69, 455/68, 455/70, 455/522, 455/574, 370/311, 714/704, 714/712
• US Class Current: 375/285
• CPC Class Codes: H04W 52/08 Closed loop power control
• CPC Class Codes: H04W 52/24 using SIR [Signal to Interference Ratio] or other wireless path parameters
• CPC Class Codes: H04W 52/42 in systems with time, space, frequency or polarisation diversity
• CPC Class Codes: H04W 52/50 at the moment of starting communication in a multiple access environment

Abstract

A method for avoiding interference in a wireless telecommunication system is provided. The method includes providing communication between a first and second component at an initial frequency. A plurality of successive line quality indicators is determined at a line quality monitor of the first component. Consecutive line quality indicators are summed over a predetermined time to determine a slow hop count. A determination is made as to whether the slow hop count is greater than a slow hop threshold. A determination is made as to whether to provide communication with the first component at a second frequency when the slow hop count is greater than the slow hop threshold. This determination is based on a power level of the second component and a communication strength received from the second component at the first component. A signal is communicated from the first component to the second component requesting the second component to provide communication at the second frequency.

Claims

1. A method for conserving power in a wireless communication system, comprising:

providing communication between a first and second component;

transmitting an initial signal from the first component to the second component at a first power level;

receiving the initial signal from the first component at the second component;

determining an initial signal quality at the second component by determining a plurality of successive line quality indicators and summing consecutive line quality indicators over a pre-determined period of time;

determining a communication strength for the initial signal at the second component; and

transmitting from the second component to the first component a request for the first component to transmit a subsequent signal at a second power level, the second power level less than the first power level, when the initial signal quality is higher than a pre-determined signal quality and the communication strength is greater than a specified range.

2. The method of claim 1, the first component comprising a mobile unit and the second component comprising a base unit.

3. The method of claim 1, the first component comprising a base unit and the second component comprising a mobile unit.

4. The method of claim 1, further comprising:

determining a power level for the initial signal at the second component, the power level comprising one of a maximum power level and at least one non-maximum power level; and

transmitting from the second component to the first component a request for the first component to transmit a subsequent signal at the maximum power level when the initial signal quality is lower than the pre-determined signal quality and the first power level is a non-maximum power level.

5. The method of claim 4, further comprising:

incrementing an attempt counter at the second component when a request is transmitted for the first component to transmit a subsequent signal at the maximum power level; and

determining a power level for the initial signal comprising determining a value of the attempt counter.

6. A system for conserving power in a wireless communication system, comprising:

a first component;

a second component for providing wireless communication with the first component and for transmitting an initial signal to the first component at a first power level;

an error detector for the first component, the error detector for determining a line quality for the initial signal;

an attempt counter for the first component, the attempt counter for indicating whether the second component is transmitting at the maximum vower level; and

the first component operable to determine a power level for the initial signal by determining a value of to attempt counter, the power level comprising one of a maximum power level and at least one non-maximum power level and to transmit a signal to the second component requesting the second component to transmit a subsequent signal at the maximum power level when the initial signal quality is lower than a pre-determined signal quality and the first power level is a non-maximum power level.

7. The system of claim 6, the first component comprising a mobile unit and the second component comprising a base unit.

8. The system of claim 6, the first component comprising a base unit and the second component comprising a mobile unit.

9. The system of claim 6, the error detector operable to determine an initial signal quality by determining a plurality of successive line quality indicators.

10. The system of claim 9, further comprising a slow hop counter for summing consecutive line quality indicators over a pre-determined period of time, the error detector further operable to determine an initial signal quality by determining a value of the slow hop counter.

11. The system of claim 6, the first component further operable to determine a communication strength for the initial signal and to transmit a signal to the second component requesting the second component to transmit a subsequent signal at a second power level, the second power level less than the first power level, when the initial signal quality is higher than the pre-determined signal quality and the communication strength is greater than a specified range.

12. A method for conserving power in a wireless communication system, comprising:

providing communication between a first and second component;

receiving an initial signal from the first component at the second component, the initial signal transmitted from the first component at a first power level;

determining a plurality of successive line quality indicators for the initial signal at the second component;

determining a line quality for the initial signal at the second component by summing consecutive line quality indicators over a pre-determined period of time; and

transmitting from the second component to the first component a request for the first component to transmit a subsequent signal at a second power level, the second power level based on the line quality for the initial signal.

13. The method of claim 12, the first component comprising a mobile unit and the second component comprising a base unit.

14. The method of claim 12, the first component comprising a base unit the second component comprising a mobile unit.

15. The method of claim 12, further comprising:

determining a communication strength for the initial signal at the second component; and

transmitting from the second component to the first component a request for the first component to transmit a subsequent signal at the second power level, the second power level less than the first power level, when the initial signal quality is higher than a pre-determined signal quality and the communication strength is greater than a specified range.

16. The method of claim 12, further comprising:

determining a power level for the initial signal at the second component, the power level comprising one of a maximum power level and at least one non-maximum power level; and

transmitting from the second component to the first component a request for the first component to transmit a subsequent signal at the second power level, the second power level comprising the maximum power level, when the initial signal quality is less than a pre-determined signal quality line quality for the initial signal is inferior to a pre-determined threshold and the first power level is a non-maximum power level.

17. The method of claim 16, further comprising:

incrementing an attempt counter at the second component when a request is transmitted for the first component to transmit a subsequent signal at the maximum power level; and

determining a power level for the initial signal comprising determining a value of the attempt counter.

18. A method for conserving power in a wireless communication system, comprising:

providing communication between a first and second component;

transmitting an initial signal from the first component to the second component at a first power level;

receiving the initial signal from the first component at the second component;

determining an initial signal quality at the second component;

determining a communication strength for the initial signal at the second component; and

transmitting from the second component to the first component a request for the first component to transmit a subsequent signal at a second power level, the second power level less than the first power level, when the initial signal quality is higher than a pre-determined signal quality and the communication strength is greater than a specified range;

determining a power level for the initial signal at the second component, the power level comprising one of a maximum power level and at least one non-maximum power level;

transmitting from the second component to the first component a request for the first component to transmit a subsequent signal at the maximum power level when the initial signal quality is lower than the pre-determined signal quality and the first power level is a non-maximum power level;

incrementing an attempt counter at the second component when a request is transmitted for the first component to transmit a subsequent signal at the maximum power level; and

determining a power level for the initial signal comprising determining a value of the attempt counter.

19. A system for conserving power in a wireless communication system, comprising:

a first component;

a second component for providing wireless communication with the first component and for transmitting an initial signal to the first component at a first power level;

a slow hop counter for summing consecutive line quality indicators over a pre-determined period of time;

an error detector for the first component, the error detector for determining a line quality for the initial signal by determining a value of the slow hop counter; and

the first component operable to determine a power level for the initial signal, the power level comprising one of a maximum power level and at least one non-maximum power level and to transmit a signal to the second component requesting the second component to transmit a subsequent signal at the maximum power level when the initial signal quality is lower than a pre-determined signal quality and the first power level is a non-maximum power level.

20. The system of claim 19, the first component further operable to determine a communication strength for the initial signal and to transmit a signal to the second component requesting the second component to transmit a subsequent signal at a second power level, the second power level less than the first power level, when the initial signal quality is higher than the pre-determined signal quality and the communication strength is greater than a specified range.

21. The system of claim 19, further comprising:

an attempt counter for the first component, the attempt counter for indicating whether the second component is transmitting at the maximum power level; and

the first component operable to determine a power level for the initial signal by determining a value of the attempt counter.