Reverse link rate and stability control

• US 7,729,243 B2
• Filed: 01/18/2005
• Issued: 06/01/2010
• Est. Priority Date: 01/18/2005
• Status: Expired due to Fees

• Current Assignee: Ericsson Evdo, Inc. (CommScope Holding Company, Inc.)
• Original Assignee: Airvana Incorporated (CommScope Holding Company, Inc.)
• Inventors: Chung, Sae-Young, Mehrabanzad, Sepehr, Ananthaiyer, Satish
• Primary Examiner(s): Harper; Kevin C
• Assistant Examiner(s): Baron; Henry
• Application Number:
  US11/037,515
• Publication Number:
  US 20060159045A1
• Time in Patent Office: 1,960 Days
• Field of Search: 370/252, 370/278, 370/329, 370/334, 370/342, 370/230
• US Class Current: 370/230
• CPC Class Codes: H04W 28/22 Negotiating communication rate

Abstract

In a radio access network, the reverse link rate of an access terminal is controlled and stabilized by determining a number of connections in one or more sectors in which the access terminal has a connection and setting a rate limit based on at least one of the determined number of connections. The number of connections can be determined for each sector in which the access terminal has a connection or for some subset of these sectors. If the number of connections is determined for more than one sector, the radio access network may limit the reverse link rate based on the sector having the greatest number of connections.

Claims

1. A method for controlling a rate of transmission of an access terminal in a radio access network, the method comprising:

for a sector of one or more sectors of the radio access network in which the access terminal has a connection, determining an effective number of connections for the sector, wherein the effective number of connections for the sector is less than a number of reverse link connections for the sector, and wherein determining the effective number of connections for the sector comprises;

for at least each reverse link connection in the sector, applying a weight to one or more characteristics of the reverse link connection to determine a weighted connection; and

summing the weighted connections to determine the effective number of connections;

and

setting a rate limit for the access terminal based on the effective number of connections, wherein setting the rate limit comprises comparing the effective number of connections with one or more ranges of values and setting the rate limit based on the comparison.

2. The method of claim 1 wherein an effective number of connections is determined for each sector of the one or more sectors in which the access terminal has a connection.

3. The method of claim 1 wherein an effective number of connections is determined for each sector of the one or more sectors in which the access terminal has a connection serviced by a common radio node.

4. The method of claim 1 further comprising:

performing a rise over thermal measurement for the sector; and

transmitting a signal to the access terminal indicating that the sector is becoming overloaded if the rise over thermal measurement (ROT) exceeds a predetermined amount.

5. The method of claim 4 further comprising:

performing a post automatic gain control ROT estimation for the sector; and

transmitting a signal to the access terminal indicating that the sector is becoming overloaded if the post automatic gain control ROT estimation exceeds a predetermined amount.

6. The method of claim 1 wherein the radio access network comprises a first evolution data-only compliant network.

7. The method of claim 1 further comprising:

transmitting the rate limit to the access terminal.

8. The method of claim 7 wherein transmitting the rate limit comprises:

broadcasting a rate limit message to the access terminal in at least one of the one or more of the sectors in which the access terminal has a connection.

9. The method of claim 7 wherein transmitting the rate limit comprises:

unicasting a rate limit message to the access terminal in a sector of the one or more sectors in which the access terminal has a traffic channel established.

10. The method of claim 1 further comprising:

transmitting, to the access terminal, a rate limit message immediately upon the access terminal establishing a connection in a sector of the one or more sectors.

27. The method of claim 1 wherein the one or more characteristics of the reverse link connection comprise at least one of the following:

whether the reverse link connection has data to send,

a location of an associated access terminal, the associated access terminal being associated with the reverse link connection in the sector, the location being determined using an earliest pseudo-random noise offset measurement,

a requested downlink rate of the associated access terminal for the reverse link connection,

a handoff factor assigned to the associated access terminal, or

a strength of a pilot signal reported in a route update message for the reverse link connection.

11. A radio node configured to transmit radio signals to, and receive radio signals from, an access terminal having one or more connections in a group of one or more sectors of a radio access network, the radio node comprising:

a processor; and

a medium bearing instructions to cause the processor to;

determine an effective number of connections for a sector of one or more sectors of the radio access network in which the access terminal has a connection, wherein the effective number of connections for the sector is less than a number of reverse link connections for the sector, and wherein determining the effective number of connections for the sector comprises;

for at least each reverse link connection in the sector, applying a weight to one or more characteristics of the reverse link connection to determine a weighted connection; and

summing the weighted connections to determine the effective number of connections;

and

set a rate limit for the access terminal based on the effective number of connections, wherein the instructions cause the processor to set the rate limit by comparing the effective number of connections with one or more ranges of values and setting the rate limit based on the comparison.

12. The radio node of claim 11 wherein the instructions cause the processor to determine an effective number of connections for each sector of the one or more sectors in which the access terminal has a connection.

13. The radio node of claim 11 wherein the group of one or more sectors is serviced by the radio node, and the radio node is further configured to receive an effective number of connections for other sectors of the one or more sectors in the radio access network in which the access terminal has a connection but is not in the group of one or more sectors serviced by the radio node.

14. The radio node of claim 13 wherein the effective number of connections for the other sectors is received from another radio node.

15. The radio node of claim 13 wherein the effective number of connections for the other sectors is received from a radio network controller.

16. The radio node of claim 11 wherein the medium also includes instructions that cause the processor to:

transmit the rate limit to the access terminal.

17. The radio node of claim 16 wherein the instructions cause the processor to transmit the rate limit to the access terminal via a unicast message.

18. The radio node of claim 16 wherein the instructions cause the processor to transmit the rate limit to the access terminal via a broadcast message.

28. The radio node of claim 11 wherein the one or more characteristics of the reverse link connection comprise at least one of the following:

whether the reverse link connection has data to send,

a location of an associated access terminal, the associated access terminal being associated with the reverse link connection in the sector, the location being determined using an earliest pseudo-random noise offset measurement,

a requested downlink rate of the associated access terminal for the reverse link connection,

a handoff factor assigned to the associated access terminal, or

a strength of a pilot signal reported in a route update message for the reverse link connection.

19. A system for controlling a rate of transmission of an access terminal in a radio access network, the system comprising:

a processor; and

a medium bearing instructions to cause the processor to;

determine an effective number of connections for a sector of one or more sectors of the radio access network in which the access terminal has a connection, wherein the effective number of connections for the sector is less than a number of reverse link connections for the sector, wherein determining the effective number of connections for the sector comprises;

for at least each reverse link connection in the sector, applying a weight to one or more characteristics of the reverse link connection to determine a weighted connection; and

summing the weighted connections to determine the effective number of connections;

and

set a rate limit for the access terminal based on the effective number of connections by comparing the effective number of connections with one or more ranges of values and setting the rate limit based on the comparison.

20. The system of claim 19 wherein the processor is part of a radio node configured to transmit radio signals to and receive radio signals from access terminals having connections in a group of one or more sectors of the radio access network, the group of one or more sectors being serviced by the radio node.

21. The system of claim 19 wherein the processor is part of a radio network controller configured to control a plurality of radio nodes collectively servicing a group of sectors in the radio access network.

22. The system of claim 20 wherein the instructions cause the processor to determine an effective number of connections for each sector of the one or more sectors in which the access terminal has a connection.

23. The system of claim 21 wherein the instructions cause the processor to determine an effective number of connections for each sector of the one or more sectors in which the access terminal has a connection.

24. The system of claim 22 further comprising:

a radio network controller in communication with said radio node, wherein the radio network controller comprises;

a second processor; and

a second medium bearing instructions that cause the second processor to determine a second effective number of connections for the access terminal in sectors of the one or more sectors in which the access has a connection but which are not part of the group of one or more sectors serviced by the radio node.

25. The system of claim 24 wherein the second medium also includes instructions that cause the second processor to set a second rate limit based on the second effective number of connections.

26. The system of claim 19 wherein the one or more characteristics of the reverse link connection comprise at least one of the following:

whether the reverse link connection has data to send,

a location of an associated access terminal, the associated access terminal being associated with the reverse link connection in the sector, the location being determined using an earliest pseudo-random noise offset measurement,

a requested downlink rate of the associated access terminal for the reverse link connection,

a handoff factor assigned to the associated access terminal, or

a strength of a pilot signal reported in a route update message for the reverse link connection.

29. A radio network controller configured to transmit radio signals to, and receive radio signals from, an access terminal having one or more connections in a group of one or more sectors of a radio access network, the radio network controller comprising:

a processor; and

a medium bearing instructions to cause the processor to;

determine an effective number of connections for a sector of one or more sectors of the radio access network in which the access terminal has a connection, wherein the effective number of connections for the sector is less than a number of reverse link connections for the sector, wherein determining the effective number of connections for the sector comprises;

for at least each reverse link connection in the sector, applying a weight to one or more characteristics of the reverse link connection to determine a weighted connection; and

summing the weighted connections to determine the effective number of connections;

and

set a rate limit for the access terminal based on the effective number of connections by comparing the effective number of connections with one or more ranges of values; and

setting the rate limit based on the comparison.

30. The radio network controller of claim 29 wherein the radio network controller is configured to transmit radio signals to, and receive radio signals from, the access terminal via one or more radio nodes of the radio access network.

31. The radio network controller of claim 29 wherein the one or more characteristics of the reverse link connection comprise at least one of the following:

whether the reverse link connection has data to send,

a location of an associated access terminal, the associated access terminal being associated with the reverse link connection in the sector, the location being determined using an earliest pseudo-random noise offset measurement,

a requested downlink rate of the associated access terminal for the reverse link connection,

a handoff factor assigned to the associated access terminal, or

a strength of a pilot signal reported in a route update message for the reverse link connection.

32. A method for controlling a rate of transmission of an access terminal in a radio access network, the method comprising:

for a sector of one or more sectors of the radio access network in which the access terminal has a connection, determining an effective number of connections for the sector, wherein the effective number of connections for the sector is less than a number of reverse link connections for the sector; and

setting a rate limit for the access terminal based on the effective number of connections, wherein setting the rate limit comprises;

assigning a first rate limit if the effective number of connections determined for the access terminal is within a first range of values; and

assigning a second rate limit if the effective number of connections determined for the access terminal is within a second range of values.

33. A radio node configured to transmit radio signals to, and receive radio signals from, an access terminal having one or more connections in a group of one or more sectors of a radio access network, the radio node comprising:

a processor; and

a medium bearing instructions to cause the processor to;

determine an effective number of connections for a sector of one or more sectors of the radio access network in which the access terminal has a connection, wherein the effective number of connections for the sector is less than a number of reverse link connections for the sector; and

set a rate limit for the access terminal based on the effective number of connections by;

setting a first rate limit if the effective number of connections determined for the access terminal is within a first range of values; and

setting a second rate limit if the effective number of connections determined for the access terminal is within a second range of values.

34. A system for controlling a rate of transmission of an access terminal in a radio access network, the system comprising:

a processor; and

a medium bearing instructions to cause the processor to;

determine an effective number of connections for a sector of one or more sectors of the radio access network in which the access terminal has a connection, wherein the effective number of connections for the sector is less than a number of reverse link connections for the sector; and

set a rate limit for the access terminal based on the effective number of connections by;

setting a first rate limit if the effective number of connections determined for the access terminal is within a first range of values; and

setting a second rate limit if the effective number of connections determined for the access terminal is within a second range of values.

35. A radio network controller configured to transmit radio signals to, and receive radio signals from, an access terminal having one or more connections in a group of one or more sectors of a radio access network, the radio network controller comprising:

a processor; and

a medium bearing instructions to cause the processor to;

determine an effective number of connections for a sector of one or more sectors of the radio access network in which the access terminal has a connection, wherein the effective number of connections for the sector is less than a number of reverse link connections for the sector; and

set a rate limit for the access terminal based on the effective number of connections by;

setting a first rate limit if the effective number of connections determined for the access terminal is within a first range of values; and

setting a second rate limit if the effective number of connections determined for the access terminal is within a second range of values.