METHOD FOR ADUSTING POWER AT A NODE

• US 20090052371A1
• Filed: 08/20/2007
• Published: 02/26/2009
• Est. Priority Date: 08/20/2007
• Status: Active Grant

• Current Assignee: Honeywell International Inc.
• Original Assignee: Honeywell International Inc.
• Inventors: Ariyur, Kartik B.
• Granted Patent: US 8,200,270 B2
• Time in Patent Office: Days
• US Class Current: 370/318
• CPC Class Codes: H04W 52/241 taking into account channel quality metrics, e.g. SIR, SNR, CIR, Eb/lo
• CPC Class Codes: H04W 52/40 during macro-diversity or soft handoff

Abstract

In one embodiment, a method for distributed power control in a network is provided. The method determines a transmit power for a plurality of transmitting nodes such that signals sent from each of the transmitting nodes are received at a receiving node at a signal to interference plus noise ratio (SINR) set point. Additionally, the method increases the SINR at the receiving node of one or more transmitting nodes of the plurality of transmitting nodes, and decreases the SINR at the receiving node of one or more other transmitting nodes of the plurality of transmitting nodes; wherein a total increase in SINR by the one or more transmitting nodes is substantially equal to total decrease in SINR by the one or more other transmitting nodes.

Claims

1. A method for distributed power control in a network, the method comprising:

determining a transmit power for a plurality of transmitting nodes such that signals sent from each of the transmitting nodes are received at a receiving node at a signal to interference plus noise ratio (SINR) set point;

increasing the SINR at the receiving node of one or more transmitting nodes of the plurality of transmitting nodes; and

decreasing the SINR at the receiving node of one or more other transmitting nodes of the plurality of transmitting nodes;

wherein a total increase in SINR by the one or more transmitting nodes is substantially equal to total decrease in SINR by the one or more other transmitting nodes.

2. The method of claim 1, further comprising:

determining an amount of information to be transmitted from each transmitting node of the one or more transmitting nodes to the receiving node, wherein the increase in SINR of each transmitting node of the one or more transmitting nodes is based on the amount of information to be transmitted by each transmitting node of the one or more transmitting nodes.

3. The method of claim 2, wherein the increase in SINR is based on a variance in the amount of information to be transmitted from each transmitting node.

4. The method of claim 2, wherein the decrease in SINR of each transmitting node of the one or more other transmitting nodes is based on the amount of information to be transmitted from each transmitting node of the one or more other transmitting nodes.

5. The method of claim 1, wherein the total increase in SINR by the one or more transmitting nodes is a sum of the increase in SINR of each transmitting node of the one or more transmitting nodes, and wherein the total decrease in SINR by the one or more other transmitting nodes is a sum of the decrease in SINR by each transmitting node of the one or more other transmitting nodes.

6. The method of claim 1, further comprising:

determining an average rate of information transmitted per transmitting node of the plurality of transmitting nodes; and

comparing a rate of information to be transmitted from a transmitting node to the average rate of information transmitted per transmitting node of the plurality of transmitting nodes.

7. The method of claim 1, further comprising:

modifying the SINR set point, whereby the transmit power of each transmitting node of the plurality of transmitting nodes is adjusted such that the average SINR of the plurality of transmitting nodes is substantially equal to the modified SINR set point.

8. A method for distributed power control in a network, the method comprising:

providing an average rate of information transmitted per transmitting node of a plurality of nodes;

comparing a rate of information to be transmitted from a first transmitting node of the plurality of nodes to the average rate of information transmitted per transmitting node of the plurality of nodes; and

adjusting a signal to interference plus noise ratio (SINR) of the first transmitting node based on the amount of information to be transmitted by the first transmitting node.

9. The method of claim 8, wherein the SINR is adjusted in proportion to a difference between the average rate of information transmitted per transmitting node and the rate of information to be transmitted from the first transmitting node.

10. The method of claim 8, wherein the rate of information to be transmitted from the first transmitting node is based on an amount of information generated at the first transmitting node.

11. The method of claim 8, wherein when the first transmitting node transmits at a rate above the average rate of information transmitted per transmitting node, the SINR of the first transmitting node is increased.

12. The method of claim 11, further comprising:

decreasing a SINR of at least one other transmitting node of the plurality of transmitting nodes, wherein a total increase in SINR by the first transmitting node is substantially equal to the total decrease in SINR by the at least one other transmitting node

13. The method of claim 8, further comprising:

at the first transmitting node, determining the average rate of information transmitted per transmitting node of the plurality of transmitting nodes.

14. The method of claim 8, further comprising:

at the first transmitting node, receiving a signal indicating the average rate of information transmitted per transmitting node of the plurality of transmitting nodes.

15. The method of claim 8, further comprising:

setting a SINR set point such that any signals received from transmitting nodes transmitting at the average rate of information are received at a SINR set point.

16. A network comprising:

a plurality of nodes in communication with each other, a receiving node of the plurality of nodes configured to receive a signal transmitted by at least one of a plurality of transmitting nodes of the plurality of nodes, each transmitting node configured to determine a transmit power such that signals sent from each of the transmitting nodes are received at the receiving node at a SINR set point;

at least one transmitting node configured to increase its SINR; and

at least one other transmitting node configured to decrease its SINR, wherein a total increase in SINR by the at least one transmitting node is substantially equal to a total decrease in SINR by the at least one other transmitting node.

17. The system of claim 16, wherein each of the plurality of transmitting nodes is configured to determine an amount of information to be transmitted to the receiving node, wherein increasing the SINR of the at least one transmitting node is based on an amount of information to be transmitted, and wherein decreasing the SINR of the at least one other transmitting node is based on an amount of information to be transmitted.

18. The method of claim 17, wherein determining an amount of information determines a rate of information to be transmitted.

19. The method of claim 17, wherein a SINR received by the receiving node is proportional to the amount of information to be transmitted.

20. The method of claim 17, wherein each transmitting node determines an average rate of information transmitted per transmitting node of the plurality of nodes.