Method and apparatus for resource reservation in a mobile radio communication system

• US 6,792,273 B1
• Filed: 06/16/1999
• Issued: 09/14/2004
• Est. Priority Date: 12/18/1998
• Status: Expired due to Fees

• Current Assignee: Unwired Planet LLC (JP Morgan Chase & Co)
• Original Assignee: Telefonaktiebolaget LM Ericsson
• Inventors: Wahlman, Stefan, Engman, Göran, Tellinger, Jan, Gustavsson, Pär
• Primary Examiner(s): Vuong, Quochien B.
• Assistant Examiner(s): LELE, TANMAY S
• Application Number:
  US09/335,047
• Time in Patent Office: 1,917 Days
• Field of Search: 455/436, 455/437, 455/438, 455/439, 455/440, 455/441, 455/442, 455/450, 455/451, 455/452, 455/560, 455/445, 455/453, 455/452.1, 455/452.2, 370/331, 370/252, 370/254
• US Class Current: 455/442
• CPC Class Codes: H04W 28/26 Resource reservation
• CPC Class Codes: H04W 36/18 for allowing seamless reselection, e.g. soft reselection

Abstract

Resources are reserved or otherwise allocated in a mobile radio communications system in an efficient and timely fashion. In general, the amount of resources that will likely be necessary to support a connection with a mobile station is predicted before those resources are actually required. More specifically, an unknown value of a dynamic connection parameter, like a number of radio paths likely to be involved in supporting the connection, is predicted. In the handover context, these radio paths might correspond to paths with different base stations (as in hard and soft handover) or to paths with different base station sectors (as in softer handover). The underlying resources are allocated using the predicted connection parameter and may include, for example, data processing and memory hardware resources, software resources, radio resources, etc. The resource allocation may also be established using both a predicted dynamic connection parameter along with one or more static connection parameters that are known at the time the connection is setup.

Claims

1. In a mobile radio communications system including plural mobile stations coupled over a radio interface to a radio network with plural base stations, a method comprising:

determining that a connection is to be established with one of the mobile stations;

predicting a number of diversity handover paths likely to be involved in supporting the connection, each diversity handover path corresponding to a base station-to-mobile station radio link used to support the connection with the mobile station at some point during the life of the connection and

allocating resources for the connection based on the predicted number of supporting diversity handover paths.

2. The method in claim 1, wherein the radio network includes plural base stations coupled to a radio network controller, the predicting step includes predicting a number of base stations involved in supporting the connection, and the diversity handover paths include a number of base station legs used to support the connection.

3. The method in claim 1, wherein the radio network includes plural base stations, the predicting step includes predicting a number of base station sectors involved in supporting the connection, and wherein diversity the handover paths include a number of base station sector legs used to support the connection.

4. The method in claim, 1 wherein the predicting step includes predicting a moving average of a number of diversity handover paths that may be involved in supporting the connection.

5. The method in claim 1, wherein the resources include data processing and memory capacity resources.

6. The method in claim 1, wherein the resources include diversity handover resources.

7. The method in claim 1, further comprising:

determining another parameter associated with the connection,

wherein the allocating step includes;

allocating resources for the connection based on the predicted number of supporting diversity handover paths and on the determined other parameter.

8. The method in claim 7, wherein the other parameter includes a bandwidth or a delay requested by a service associated with the connection.

9. The method in claim 7, wherein the other parameter includes a data processing capacity or a memory capacity associated with the connection.

10. The method in claim 1, wherein the predicting step includes predicting an average number of diversity handover paths including:

monitoring a number of diversity handover paths for active mobile station connections, and

at a predetermined time interval, calculating the average number of diversity handover paths for active connections.

11. The method in claim 10, wherein a variable number of diversity handover paths is monitored.

12. The method in claim 10, further comprising:

setting the predetermined time interval depending upon a desired speed of response to changing handover path conditions.

13. A control node for use in a radio communications network where mobile stations communicate with base stations over a radio interface, each base station being associated with at least one geographic cell area, comprising:

a communications controller configured to initiate establishment of a connection between the radio communications network and a mobile station; and

a resource controller, coupled to the communications controller, configured to allocate resources to support the connection based on a predicted number of handover paths likely to be involved in supporting the connection, each handover path corresponding to a base station-to-mobile station radio link used to support the connection with the mobile station,

wherein the handover paths are diversity soft or softer handover paths that, for some portion of time, support the connection during the same time.

14. The control node in claim 13, wherein the resource controller is configured to determine the predicted handover number of paths based on a number of diversity handover paths in a base station cell in which the mobile station is located when the connection is established.

15. The control node in claim 13, wherein the resource controller is configured to determine the predicted number of diversity handover paths based on a number of diversity handover paths per mobile station in plural base station cells in the radio network.

16. The control node in claim 13, wherein the statistical algorithm includes an averaging calculation.

17. The control node in claim 13, wherein the resource controller is located in a base station, and wherein the diversity handover paths are from plural base station sectors.

18. The control node in claim 13, wherein the resource controller is located in a radio network controller coupled to plural base stations, and wherein the diversity handover paths are from different base stations.

19. The control node in claim 13, wherein the resources include data processing and memory capacity resources.

20. The control node in claim 13, wherein the resource controller is configured to determine the predicted number of diversity handover paths per mobile station based on an average number of diversity handover paths in one or more cells in the radio network.

21. In a mobile radio communications system including plural mobile stations coupled over a radio interface to a diversity with plural base stations, a method comprising:

determining that a connection is to be established with one of the mobile stations;

predicting a likely number of diversity handover links needed to support the connection at some point during the life of the connection; and

allocating resource capacity for the connection based on the predicted dynamic connection parameter.

22. The method in claim 21, wherein the average number is determined using information from a cell in which the connection with the mobile station is initially established.

23. The method in claim 21, wherein the average number is determined using information from plural cells in the radio network.

24. The method in claim 21, further comprising:

varying a time period over which the average number is determined.

25. The method in claim 21, further comprising:

determining the value of the number of diversity handover links for a number of earlier established connections, and

wherein the predicting step includes predicting the number of diversity handover links based on the determined value.

26. The method in claim 25, further comprising:

varying the number of earlier established connections.

27. The method in claim 21, further comprising:

determining a static parameter requested for the connection, and

allocating resource capacity for the connection also based on the determined static parameter.

28. The method in claim 27, wherein the static parameter is radio bandwidth.

29. The method in claim 27, wherein the number of radio communication handover links is a number of base stations or base station sectors supporting the connection at some point during the life of the connection.

30. The method in claim 27, wherein the static parameter is a delay parameter.

35. The method in claim 21, further comprising:

monitoring a number of diversity handover paths for active mobile station connections, and

at a predetermined time interval, calculating an average number diversity handover paths for active connections,

wherein the dynamic connection parameter is the average number of diversity handover paths for active mobile connections in a particular area.

31. A resource controller for use in a radio communications network, communicating with mobile stations via one or more base stations, and programmed to perform the following computer-executable tasks to support a connection with a mobile station:

determine a diversity path parameter associated with a diversity handover operation involving the connection using diversity path values determined for other active mobile connections; and

reserve resources to support the connection based on the predicted parameter.

32. The resource controller in claim 31, wherein the resources include a number of diversity handover units.

33. The resource controller in claim 31, wherein the resources are diversity resources and include an amount of memory needed for the predicted diversity handover parameter.

34. The resource controller in claim 31, wherein the resources are diversity resources and include an amount of data processing resources needed for the predicted diversity handover parameter.