Controlling telecommunications channel switching

• US 8,948,106 B2
• Filed: 11/25/2011
• Issued: 02/03/2015
• Est. Priority Date: 10/06/2011
• Status: Active Grant

• Current Assignee: Telefonaktiebolaget LM Ericsson
• Original Assignee: Telefonaktiebolaget LM Ericsson
• Inventors: Hannu, Hans, Christoffersson, Jan
• Primary Examiner(s): Mattis, Jason
• Application Number:
  US13/322,982
• Publication Number:
  US 20130089038A1
• Time in Patent Office: 1,166 Days
• Field of Search: 370/252, 370/311, 370/329
• US Class Current: 370/329
• CPC Class Codes: H04W 76/27 Transitions between radio resource control [RRC] states
• CPC Class Codes: Y02D 30/70 in wireless communication networks

Abstract

A node (26) of a radio access network (24) and method of operating such node controls transitions between radio resource control states for a wireless terminal (30). In an example embodiment and mode the method comprises: (1) upon completion of a data activity, making a prediction of a data transmission parameter; (2) making an assessment regarding probable accuracy of the prediction; and (3) using the assessment to make a determination whether or not to implement a radio resource control state switch (the “state switch”). The data transmission parameter may be a different parameter in respective differing example embodiments. In one example embodiment and mode the data transmission parameter comprises inter-arrival time between bursts of data activity. In another example embodiment and mode the data transmission parameter comprises burst size of a burst of data activity.

Claims

1. A method of operating a node of a radio access network which controls transitions between radio resource control states for a wireless terminal, the method comprising the acts of:

(1) upon a completion of a data activity, making a prediction of a data transmission parameter, the data activity being a transfer of data between the wireless terminal and the node;

(2) making an assessment regarding probable accuracy of the prediction; and

(3) using the assessment to make a determination whether or not to implement a radio resource control state switch,

wherein making the assessment comprises determining that the probable accuracy of the prediction exceeds an accuracy threshold, and

wherein the accuracy threshold is selected based on one or both of a weighted cost of erroneously making a decision to switch the radio resource control state, and a weighted cost of erroneously making a decision not to switch the radio resource control state.

2. The method of claim 1, wherein the data transmission parameter comprises at least one of:

an inter-arrival time between bursts of data activity; and

,

a burst size of a burst of data activity.

3. The method of claim 1, wherein the data transmission parameter comprises an inter-arrival time between bursts of data activity, the method further comprising:

implementing the state switch to a lower radio resource control state regardless of the prediction and the assessment when an elapsed time since a last burst of data activity exceeds a limit value.

4. The method of claim 1, wherein when the determination is not to implement the state switch, the method further comprising making another prediction of the data transmission parameter and then performing acts (2)-(3) with respect to the another prediction.

5. The method of claim 4, further comprising waiting a predetermined time before making the another prediction but making the another prediction before a next data activity occurs.

6. The method of claim 4, further comprising:

using a first prediction technique to make the prediction of act (1);

using a second prediction technique to make the another prediction.

7. The method of claim 1, further comprising making the assessment regarding the probable accuracy of the prediction after making the prediction of the data transmission parameter so that the assessment confirms the prediction.

8. The method of claim 1,

wherein the prediction of the data transmission parameter is a prediction of the inter-arrival time to the next burst, and

wherein when the determination is not to implement the state switch, the method further comprises making another prediction of the inter-arrival time to the next burst and then performing acts (2)-(3) with respect to the another prediction.

9. A node of a radio access network which controls transitions between radio resource control states for a wireless terminal, the node comprising:

a radio resource manager configured to;

(1) make a prediction of a data transmission parameter upon a completion of a data activity, the data activity being a transfer of data between the wireless terminal and the node;

(2) make an assessment regarding probable accuracy of the prediction determining that the probable accuracy exceeds an accuracy threshold;

(3) use the assessment to make a determination whether or not to implement a radio resource control state switch; and

a communications interface through which the node notifies the wireless terminal whether or not to implement the state switch,

wherein the accuracy threshold is selected based on one or both of a weighted cost of erroneously making a decision to switch the radio resource control state, and a weighted cost of erroneously making decision not to switch the radio control state.

10. The node of claim 9, wherein the data transmission parameter comprises at least one of:

an inter-arrival time between bursts of data activity; and

a burst size of a burst of data activity.

11. The node of claim 9,

wherein the data transmission parameter comprises inter-arrival time between bursts of data activity, and

wherein the radio resource manager is configured to implement the state switch to a lower radio resource control state regardless of the prediction and the assessment when an elapsed time since the last burst of data activity exceeds a limit value.

12. The node of claim 9, wherein when the determination is not to implement the state switch, the radio resource manager is configured to make another prediction of the data transmission parameter and then to perform acts (2)-(3) with respect to the another prediction.

13. The node of claim 12, wherein the radio resource manager is configured to wait a predetermined time before making the another prediction but making the another prediction before a next data activity occurs.

14. The node of claim 12, wherein the radio resource manager is configured to use a first prediction technique to make the prediction of act (1) and to use a second prediction technique to make the another prediction.

15. The node of claim 9, wherein the radio resource manager is further configured to make the assessment regarding the probable accuracy of the prediction after making the prediction of the data transmission parameter so that the assessment confirms the prediction.

16. The node of claim 9, wherein the prediction of the data transmission parameter is prediction of the inter-arrival time to the next burst, the radio resource manager is further configured to make another prediction of the inter-arrival time to the next burst and then performing acts (2)-(3) with respect to the another prediction.

17. A method of operating a node of a radio access network configured to control radio resource control (RRC) states for a wireless terminal, the method comprising:

making, by the node, a prediction of a data transmission parameter upon a completion of a data activity associated with a wireless terminal, the data activity being a transfer of data between the wireless terminal and the node;

making, by the node, an assessment of an accuracy of the prediction by determining whether or not the probable accuracy of the prediction exceeds an accuracy threshold;

determining, by the node, whether a state switch should be implemented based on the assessment, the state switch comprising switching of the RRC state of the wireless terminal to a lower state; and

implementing, by the node, the state switch when it is determined that the state switch should be implemented based on the assessment,

wherein the accuracy threshold is set in relation to a cost of making an erroneous prediction such that higher accuracy threshold correlates to higher cost of the erroneous prediction.

18. The method of claim 17, wherein when it is determined that the state switch should be implemented based on the assessment, the state switch is implemented even when an elapsed time since a last burst of the data activity does not exceed a limit value.

19. The method of claim 17, further comprising:

determining whether an elapsed time since a last burst of the data activity exceeds a limit value; and

implementing the state switch when it is determined that the elapsed time exceeds the limit value,

wherein when it is determined that the elapsed time exceeds the limit value, the state switch is implemented even when it is determined that the state switch should not be implemented based on the assessment.

20. The method of claim 17,

wherein the act of making the prediction comprises making a first prediction of the data transmission parameter,

wherein the act of making the assessment comprises making a first assessment of the accuracy of the first prediction,

wherein the act of determining whether the state switch should be implemented based on the assessment comprises determining whether the state switch should be implemented based on the first assessment, and

wherein the method further comprises:

making a second prediction of the data transmission parameter when it is determined that that the state switch should not be implemented based on the first assessment;

making a second assessment of an accuracy of the second prediction; and

determining whether the state switch should be implemented based on the second assessment.

21. The method of claim 20, further comprising:

waiting a predetermined time period before performing the act of making the second prediction when it is determined that that the state switch should not be implemented based on the first assessment.

22. The method of claim 20,

wherein the act of making the first prediction comprises making the first prediction using a first prediction technique, and

wherein the act of making the second prediction comprises making the second prediction using a second prediction technique.

23. The method of claim 17, further comprising:

determining whether the state switch is warranted based on the prediction,

wherein the act of making the assessment of the accuracy of the prediction and the act of determining whether the state switch should be implemented based on the assessment are performed when it is determined that the prediction warrants the state switch.

24. The method of claim 23, further comprising:

determining whether an elapsed time since a last burst of the data activity does exceeds a limit value; and

implementing the state switch when it is determined that the elapsed time does exceed the limit value,

wherein when it is determined that the elapsed time does exceed the limit value, the state switch is implemented even when it is determined that the prediction does not warrant the state switch.

25. The method of claim 17, wherein the act of making the prediction comprises predicting whether a time to next data activity will be longer or shorter than a specified value t.

26. The method of claim 25,

wherein in the act of making the prediction, it is predicted that the time to next data activity will be longer than the specified value t,

wherein the act of making the assessment comprises determining an accuracy probability, the accuracy probability being a probability of the prediction being accurate, and

wherein the act of determining whether the state switch should be implemented based on the assessment comprises determining that the state switch should be implemented when the accuracy probability exceeds an accuracy threshold.

27. A node of a radio access network configured to control radio resource control (RRC) states for a wireless terminal, the node comprising:

a resource manager configured to;

make a prediction of a data transmission parameter upon a completion of a data activity associated with a wireless terminal, the data activity being a transfer of data between the wireless terminal and the node,

make an assessment of an accuracy of the prediction by determining whether or not the probable accuracy of the prediction exceeds an accuracy threshold,

determine whether a state switch should be implemented based on the assessment, the state switch comprising switching of the RRC state of the wireless terminal to a lower state, and

implement the state switch when it is determined that the state switch should be implemented based on the assessment,

wherein the accuracy threshold is set in relation to a cost of making an erroneous prediction such that higher accuracy threshold correlates to higher cost of the erroneous prediction.

28. The node of claim 27, wherein when it is determined that the state switch should be implemented based on the assessment, the resource manager is configured to implement the state switch even when an elapsed time since a last burst of the data activity does not exceed a limit value.

29. The node of claim 27, wherein the resource manager is configured to:

make a first prediction of the data transmission parameter,

make a first assessment of the accuracy of the first prediction,

determine whether the state switch should be implemented based on the assessment based on the first assessment,

make a second prediction of the data transmission parameter when it is determined that that the state switch should not be implemented based on the first assessment,

make a second assessment of an accuracy of the second prediction, and

determine whether the state switch should be implemented based on the second assessment.

30. The node of claim 27, wherein the resource manager is configured to:

determine whether the state switch is warranted based on the prediction, and

make the assessment of the accuracy of the prediction and determine whether the state switch should be implemented based on the assessment when it is determined that the prediction warrants the state switch.

31. The node of claim 27, wherein the resource manager is configured to:

predict that the time to next data activity will be longer than a specified value t,

determine an accuracy probability, the accuracy probability being a probability of the prediction being accurate, and

determine that the state switch should be implemented when the accuracy probability exceeds an accuracy threshold.