METHOD AND SYSTEM FOR PERFORMING DISTRIBUTED OUTER LOOP POWER CONTROL IN WIRELESS COMMUNICATION NETWORKS

• US 20090093267A1
• Filed: 10/08/2007
• Published: 04/09/2009
• Est. Priority Date: 10/08/2007
• Status: Active Grant

• Current Assignee: Honeywell International Inc.
• Original Assignee: Honeywell International Inc.
• Inventors: Ariyur, Kartik B.
• Granted Patent: US 7,899,483 B2
• Time in Patent Office: Days
• US Class Current: 455/522
• CPC Class Codes: H04W 52/12 Outer and inner loops
• 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

A method and system for performing distributed outer loop power control in a wireless communication network are disclosed. The method includes the steps of determining a transmit power for a plurality of transmitting nodes such that signals sent from each of the transmitting nodes are received at a receiver associated with a receiving node at a predetermined 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 if a saturation value for a front end of the receiver associated with the receiving node is not near a predetermined saturation value, and decreasing the SINR at the receiving node of the one or more transmitting nodes of the plurality of transmitting nodes if the saturation value for the front end of the receiver associated with the receiving node is near the predetermined saturation value.

Claims

1. A method for performing distributed outer loop power control in a wireless communication network, comprising the steps of:

determining a transmit power for a plurality of transmitting nodes such that signals sent from each of the transmitting nodes are received at a receiver associated with a receiving node at a predetermined 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 if a saturation value for a front end of the receiver associated with the receiving node is not near a predetermined saturation value; and

decreasing the SINR at the receiving node of the one or more transmitting nodes of the plurality of transmitting nodes if the saturation value for the front end of the receiver associated with the receiving node is near the predetermined saturation value.

2. The method of claim 1, wherein the determining step further comprises a step of:

determining a goodput value for a plurality of communication links in the wireless communication network; and

determining a SINR set point value for each communication link of the plurality of communication links.

3. The method of claim 1, wherein the determining step further comprises a step of:

determining a goodput value for a plurality of communication links in the wireless communication network; and

determining a SINR set point value for each communication link of the plurality of communication links based on the goodput values.

4. The method of claim 1, wherein the determining step further comprises a step of:

determining a frame error rate value for a plurality of communication links in the wireless communication network; and

determining a SINR set point value for each communication link of the plurality of communication links based on the frame error rate values.

5. The method of claim 1, wherein at least one of the increasing step and decreasing step comprises a step of:

providing feedback to the one or more transmitting nodes of the plurality of transmitting nodes including at least one of a total receive power value, a saturation power value, and a SINR value.

6. The method of claim 1, wherein at least one of the increasing step and decreasing step comprises the steps of:

setting a SINR set point value proportional to a difference between a receive saturation power value and a total receive power at the one or more transmitting nodes of the plurality of transmitting nodes.

7. The method of claim 1, wherein the steps are performed by a processor unit associated with the one or more transmitting nodes, and the one or more transmitting nodes are one or more cellular radiotelephones.

8. The method of claim 1, further comprising the steps of:

a priori distributing a predetermined capacity associated with the one or more transmitting nodes of the plurality of transmitting nodes such that a sum of a plurality of power values at a receiver associated with a receiving node is substantially equal to a predetermined saturation power for the receiver.

9. The method of claim 1, further comprising the steps of:

determining a received power level for a transmitting node i at a receiving node j;

determining a channel gain associated with the received power level; and

determining a maximum transmit power value possible for the transmitting node i.

10. The method of claim 1, further comprising the steps of:

determining a received power level for a transmitting node i at a receiving node j;

determining a channel gain associated with the received power level, whereby the channel gain is associated with a ratio of the received power level to a transmitted power level; and

determining a maximum transmit power value possible for the transmitting node i.

11. A method for performing distributed outer loop power control in a cellular communication network, comprising the steps of:

determining a transmit power for a plurality of mobile units such that signals sent from each of the mobile units are received at a receiver associated with a base station at a predetermined signal-to-interference plus noise ratio (SINR) set point;

increasing the SINR at the base station receiver of one or more of the mobile units if a saturation value for a front end of the base station receiver is not near a predetermined value; and

decreasing the SINR at the base station receiver if the saturation value for the front end of the base station receiver is near the predetermined saturation value.

12. The method of claim 11, wherein the determining step further comprises a step of:

determining a goodput value for a plurality of one-hop communication links in the cellular communication network; and

determining a SINR set point value for each one-hop communication link.

13. A wireless communication system, comprising:

a plurality of nodes including at least one receiving node and a plurality of transmitting nodes, each transmitting node of the plurality of transmitting nodes communicatively coupled to the at least one receiving node, wherein the at least one receiving node is configured to;

receive a signal transmitted by at least one transmitting node of the plurality of transmitting nodes; and

the at least one transmitting node of the plurality of transmitting nodes is configured to;

determine a transmit power such that signals sent from the at least one transmitting node is received at the at least one receiving node at a predetermined SINR set point;

increase an SINR at the at least one receiving node if a saturation value for a front end of a receiver associated with the at least one receiving node is not near a predetermined saturation value; and

decrease the SINR at the at least one receiving node if the saturation value for the front end of the receiver associated with the at least one receiving node is near the predetermined saturation value.

14. The wireless communication system of claim 13, wherein the at least one receiving node is further configured to:

determine a goodput value for a plurality of communication links in a network associated with the wireless communication system; and

determine a SINR set point value for each communication link of the plurality of communication links.

15. The wireless communication system of claim 13, wherein the at least one receiving node is further configured to:

determine a goodput value for a plurality of communication links in a network associated with the wireless communication system; and

determine a SINR set point value for each communication link of the plurality of communication links based on the goodput values.

16. The wireless communication system of claim 13, wherein the at least one receiving node is further configured to:

determine a frame error rate value for a plurality of communication links in a network associated with the wireless communication system; and

determine a SINR set point value for each communication link of the plurality of communication links based on the frame error rate values.

17. The wireless communication system of claim 13, wherein the at least one receiving node is further configured to:

provide feedback to the at least one transmitting node of the plurality of transmitting nodes including at least one of a total receive power value, a saturation power value, and a SINR value.

18. The wireless communication system of claim 13, wherein at least one transmitting node is further configured to:

set a SINR set point value proportional to a difference between a receive saturation power value and a total receive power.

19. The wireless communication system of claim 13, wherein the at least one receiving node includes a receiver and a processor unit associated with a base station, and the plurality of transmitting nodes is a plurality of cellular mobile or fixed radiotelephones.

20. The wireless communication system of claim 13, wherein the system includes a cellular network operated in accordance with a spread spectrum communication network protocol.