METHOD AND ARRANGEMENT FOR PROCESSING MOBILE STATION HISTORY INFORMATION IN A WIRELESS COMMUNICATION SYSTEM

• US 20100142486A1
• Filed: 12/20/2007
• Published: 06/10/2010
• Est. Priority Date: 04/26/2007
• Status: Active Grant

• Current Assignee: Telefonaktiebolaget LM Ericsson
• Original Assignee: Telefonaktiebolaget LM Ericsson
• Inventors: Wahlqvist, Maltias, Mildh, Gunnar
• Granted Patent: US 8,345,632 B2
• Time in Patent Office: Days
• US Class Current: 370/332
• CPC Class Codes: H04W 24/08 Testing, supervising or monitoring using real traffic
• CPC Class Codes: H04W 36/0055 Transmission or use of information for re-establishing the radio link
• CPC Class Codes: H04W 36/0064 of control information between different access points
• CPC Class Codes: H04W 36/0083 Determination of parameters used for hand-off, e.g. generation or modification of neighbour cell lists
• CPC Class Codes: H04W 36/00835 Determination of neighbour cell lists
• CPC Class Codes: H04W 36/00837 Determination of triggering parameters for hand-off
• CPC Class Codes: H04W 36/008375 based on historical data
• CPC Class Codes: H04W 72/20 Control channels or signalling for resource management
• CPC Class Codes: H04W 92/20 between access points

Abstract

Methods and apparatus for processing mobile station transaction information at a serving control node in a wireless communication system are disclosed. The serving control node may be a base station, such as an eNodeB in an LTE/SAE wireless communication system. The transaction information, which may include, for example, mobility-related transaction information and traffic-related transaction information for a given mobile station, may be passed between controlling control nodes as the corresponding mobile station is handed over, so that a controlling control node has access to information characterizing the past activities of the mobile station. This information may be used in some embodiments for selecting a target control node for handover or for allocating link resources.

Claims

1. A method for processing mobile station transaction information at a serving control node in a wireless communication system, characterized in that the method comprises:

receiving (310, 410) a transaction history record from a transferring control node in association with a first handover of a mobile station (160) to the serving control node;

adding (330, 340, 350, 460) mobile station transaction data related to the serving control node to the transaction history record to obtain an updated transaction history record;

transferring (360, 470) the updated transaction history record to a target control node in association with a subsequent handover of the mobile station (160) to the target control node.

2. The method of claim 1, further characterized in that the mobile station transaction data comprises mobility-related transaction information (230) or traffic-related transaction information (240) or both.

3. The method of claim 1, further characterized in that the transaction history record comprises identifiers for one or more cells visited by the mobile station (160) before arriving at the serving control node.

4. The method of claim 1, further characterized in that adding (330, 340, 350, 460) mobile station transaction data related to the serving control node to the transaction history record to obtain an updated transaction history record comprises adding a cell identification parameter for the serving control node and one or more of a cell descriptor and one or more time parameters indicating a length of time for which the mobile station (160) was served by the serving control node.

5. The method of claim 4, further characterized in that the cell descriptor indicates a cell type or a cell size or both.

6. The method of claim 1, further characterized in that adding (330, 340, 350, 460) mobile station transaction data related to the serving control node to the transaction history record to obtain an updated transaction history record comprises adding at least one traffic activity parameter.

7. The method of claim 6, further characterized in that the at least one traffic activity parameter indicates one or more of a data bearer type, a data quantity, a data rate, and a data activity time.

8. The method of claim 1, further characterized in that adding (330, 340, 350, 460) mobile station transaction data related to the serving control node to the transaction history record to obtain an updated transaction history record comprises updating one or more cumulative parameters included in the transaction history record.

9. The method of claim 1, further characterized in that the method further comprises selectively removing one or more data items from the received transaction history record based on the age of the one or more data items.

10. The method of claim 1, further characterized in that the method further comprises selectively removing one or more data items from the received transaction history record based on the size of the transaction history record and a predetermined maximum size for the transaction history record.

11. The method of claim 1, further characterized in that the method further comprises identifying (440) previously visited cells for the mobile station (160) using the transaction history record and selecting (450) the target control node for the subsequent handover based on the previously visited cells.

12. The method of claim 1, further characterized in that the method further comprises:

identifying (440) previously visited cells for the mobile station (160) using the transaction history record;

evaluating the identified previously visited cells to detect one or more undesired handover patterns; and

selecting (450) the target control node for the subsequent handover based on said evaluation and the previously identified cells.

13. The method of claim 12, further characterized in that the one or more undesired handover patterns include a ping-pong handover pattern characterized by repeated handovers between two base stations, wherein selecting (450) the target control node for the subsequent handover based on said evaluation and the previously identified cells comprises adjusting one or more handover criteria in response to detecting said ping-pong handover pattern.

14. The method of claim 12, further characterized in that the method further comprises generating a diagnostic message in response to detecting one or more of the undesired handover patterns.

15. The method of claim 1, further characterized in that the method further comprises determining an estimated speed for the mobile station (160) using the transaction history record and selecting the target control node for the subsequent handover based on the estimated speed.

16. The method of claim 1, further characterized in that the method further comprises predicting (420) a link resource requirement for the mobile station (160) based on the transaction history record and allocating (430) link resources based on the predicted link resource requirement.

17. A first control node for use in a wireless communication system, the first control node including a processing unit, characterized in that the processing unit is configured to:

receive a transaction history record from a transferring control node in association with a first handover of a mobile station (160) to the first control node;

add mobile station transaction data related to the first control node to the transaction history record to obtain an updated transaction history record;

transfer the updated transaction history record to a target control node in association with a subsequent handover of the mobile station (160).

18. The first control node of claim 17, further characterized in that the mobile station transaction data comprises mobility-related transaction information (230) or traffic-related transaction information (240) or both.

19. The first control node of claim 17, further characterized in that the transaction history record comprises a list of cells visited by the mobile station (160) before arriving at the first control node.

20. The first control node of claim 17, wherein the first control node comprises a base station node (500) in the wireless communication system.

21. The first control node of claim 17, wherein the first control node comprises a radio network controller (RNC) in the wireless communication system.

22. The first control node of claim 17, wherein the first control node comprises a base station controller (BSC) in the wireless communication system.

23. The first control node of claim 17, further characterized in that the processing unit is configured to add mobile station transaction data related to the first control node to the transaction history record to obtain an updated transaction history record by adding a cell identification parameter associated with the first control node and one or more of a cell descriptor and one or more time parameters indicating a length of time for which the mobile station (160) was served by a cell corresponding to the cell identification parameter.

24. The first control node of claim 23, further characterized in that the cell descriptor indicates a cell type or a cell size or both.

25. The first control node of claim 17, further characterized in that the processing unit is configured to add mobile station transaction data related to the first control node to the transaction history record to obtain an updated transaction history record by adding at least one traffic activity parameter.

26. The first control node of claim 25, further characterized in that the at least one traffic activity parameter indicates one or more of a data bearer type, a data quantity, a data rate, and a data activity time.

27. The first control node of claim 17, further characterized in that the processing unit is configured to add mobile station transaction data related to the first control node to the transaction history record to obtain an updated transaction history record by updating one or more cumulative parameters included in the transaction history record.

28. The first control node of claim 17, further characterized in that the processing unit is further configured to selectively remove one or more data items from the received transaction history record based on the age of the one or more data items.

29. The first control node of claim 17, further characterized in that the processing unit is further configured to selectively remove one or more data items from the received transaction history record based on the size of the transaction history record and a predetermined maximum size for the transaction history record.

30. The first control node of claim 17, further characterized in that the processing unit is further configured to identify previously visited cells for the mobile station (160) using the transaction history record and to select the target control node for the subsequent handover based on the previously visited cells.

31. The first control node of claim 17, further characterized in that the processing unit is further configured to determine an estimated speed for the mobile station (160) using the transaction history record and to select the target control node for the subsequent handover based on the estimated speed.

32. The first control node of claim 17, further characterized in that the processing unit is further configured to predict a link resource requirement for the mobile station (160) based on the transaction history record and to allocate link resources based on the predicted link resource requirement.

33. The first control node of claim 17, further characterized in that the processing unit is further configured to:

identify previously visited cells for the mobile station (160) using the transaction history record;

evaluate the identified previously visited cells to detect one or more undesired handover patterns; and

select the target control node for the subsequent handover based on said evaluation and the previously identified cells.

34. The first control node of claim 33, further characterized in that the one or more undesired handover patterns include a ping-pong handover pattern characterized by repeated handovers between two base stations, wherein the processing unit is further configured to adjust one or more handover criteria in response to detecting said ping-pong handover pattern.

35. The first control node of claim 33, further characterized in that the processing unit is further configured to generate a diagnostic message in response to detecting one or more of the undesired handover patterns.

36. A computer program product for use in or with a control node in a wireless communication system, the computer program product comprising computer-readable instructions for performing a method, characterized in that the method comprises:

receiving (310, 410) a transaction history record from a transferring control node in association with a first handover of a mobile station (160) to the serving control node;

adding (330, 340, 350, 460) mobile station transaction data related to the serving control node to the transaction history record to obtain an updated transaction history record;

transferring (360, 470) the updated transaction history record to a target control node in association with a subsequent handover of the mobile station (160) to the target control node.