Method and arrangement for handling handover related parameters in a mobile communications network

Patent metadata

Field	Value
Publication number	US-9485704-B2
Application number	US-93557508-A
Country	US
Kind code	B2
Filing date	Apr 3, 2008
Priority date	Apr 3, 2008
Publication date	Nov 1, 2016
Grant date	Nov 1, 2016

Abstract

The invention relates to methods and arrangements for handling handover-related parameters. A radio base station of a mobile communications network is arranged to serve at least a first cell, and to make handover decisions based on handover-related parameters. The radio base station comprises means for receiving handover related feedback from a radio base station serving a second cell after handover of a UE from said first cell to said second cell; means for using the handover related feedback received from the base station serving said second cell to adjust the handover-related parameters; and further by means for sending handover related feedback to a radio base station serving a second or another cell after handover of a UE to said first cell from said second or another cell.

First claim

The invention claimed is:

1. A radio base station of a mobile communications network, the radio base station arranged to serve at least a first cell, and to make handover decisions based on handover-related parameters, said radio base station comprising one or more processing circuits configured to:
receive handover related feedback from a radio base station serving a second cell after handover of a UE from said first cell to said second cell; and
use the handover related feedback received from the base station serving said second cell to adjust the handover-related parameters.

2. The radio base station according to claim 1 , wherein said handover related feedback comprises post-handover measurements performed by a UE after handover from said first cell to said second cell or from said second or another cell to the first cell, whereby the radio base station is further configured to:
receive post-handover measurements from a UE in said first cell, said measurements performed by the UE after handover to said first cell from a second or another cell; and
send said post-handover measurements to a radio base station serving said second or another cell.

3. The radio base station according to claim 2 , wherein the radio base station is configured to instruct a UE in said first cell to perform post-handover measurements after handover from said first cell to said second cell and to forward said measurements to a radio base station serving said second cell.

4. The radio base station according to claim 3 , wherein the radio base station is configured to instruct said UE to perform post-handover measurements during a configurable time period after handover from said first cell to the second cell.

5. The radio base station according to claim 2 , wherein said post-handover measurements comprise a measurement of received signal power.

6. The radio base station according to claim 1 , wherein the radio base station is configured to send, to a radio base station serving said second cell, a request to send handover related feedback after handover of a UE from said first cell to said second cell.

7. The radio base station according to claim 6 , wherein said request comprises instructions to send a request for post-handover measurements to a UE in said second cell after a handover of the UE from said first cell to said second cell.

8. The radio base station according to claim 1 , wherein the radio base station is configured to send the handover related feedback received from the base station serving said second cell to a handover-related parameter auto-tuning node arranged to use said handover related feedback to adjust handover-related parameters.

9. The radio base station according to claim 1 , wherein the handover-related parameters comprise a handover time-to-trigger.

10. The radio base station according to claim 1 , wherein the handover-related parameters comprise a handover hysteresis margin.

11. The radio base station according to claim 1 , wherein the radio base station is configured to send a request to a radio base station serving a second cell to return a report in case a UE is handed over from said second cell to a third cell within a predefined time period after a handover of the UE from said first cell to said second cell.

12. A method in a radio base station of handling handover-related parameters in a mobile communications network, the radio base station serving a first cell and arranged to make handover decisions based on handover-related parameters, the method comprising: receiving handover-related feedback from a radio base station serving a second cell after handover of a UE from the first cell to the second cell; and using said received handover-related feedback to adjust the handover-related parameters.

13. The method according to claim 12 , wherein said handover-related feedback comprises post-handover measurements, said measurements performed by a UE in said second cell after handover from said first cell to said second cell.

14. The method according to claim 13 , further comprising instructing a user equipment (UE) in the first cell to perform post-handover measurements after handover from the first cell to the second cell and to forward said measurements to a radio base station serving the second cell.

15. The method according to claim 14 , wherein the UE is instructed to perform post-handover measurements during a configurable time period after handover from said first cell to the second after cell.

16. The method according to claim 13 , wherein said post-handover measurements comprise measurements of received signal power.

17. The method according to claim 12 , further comprising sending, to a radio base station serving the second cell, a request to send handover related feedback after handover of a user equipment (UE) from said first cell to said second cell.

18. The method according to claim 17 , wherein said request comprises instructions to send a request for post-handover measurements to a UE in said second cell after a handover of the UE from said first cell to said second cell.

19. The method according to claim 12 , further comprising sending the handover-related feedback received from the base station serving the second cell to a handover-related parameter auto-tuning node arranged to use handover-related feedback to adjust handover-related parameters.

20. The method according to claim 12 , wherein the handover-related parameters comprise a handover time-to-trigger.

21. The method according to claim 12 , wherein the handover-related parameters comprise a handover hysteresis margin.

22. The method according to claim 12 , further comprising sending a request to a radio base station serving a second cell to return a report in case a user equipment (UE) is handed over from said second cell to a third cell within a predefined time period after a handover of the UE from said first cell to said second cell.

23. A method in a radio base station of handling handover-related parameters in a mobile communications network, the radio base station serving a second cell, the method comprising:
sending handover-related feedback to a radio base station serving a first cell after handover of a user equipment (UE) from the first cell to said second cell for adjustment of handover-related parameters used as basis for handover decisions in said first cell.

24. The method according to claim 23 , wherein said handover-related feedback comprises post-handover measurements, said method further comprising:
receiving post-handover measurements from a UE, said post-handover measurements performed by the UE after handover from a first cell to said second cell; and
sending said post-handover measurements to a radio base station serving said first cell for adjustment of handover-related parameters used as basis for handover decisions in said first cell.

25. The method according to claim 24 , wherein said post-handover measurements comprise measurements of received signal power.

26. The method according to claim 23 , further comprising receiving, from a radio base station serving the first cell, a request to send handover related feedback after handover of a UE from said first cell to said second cell.

27. The method according to claim 26 , wherein said request comprises instructions to send a request for post-handover measurements to a UE in said second cell, said method further comprising sending,

Assignees

• Frenger Pal
• Gunnarsson Fredrik
• Moe Johan
• ERICSSON TELEFON AB L M (publ)

Inventors

• Frenger Pal
• Gunnarsson Fredrik
• Moe Johan

Classifications

• H04W36/08

  Reselecting an access point · CPC title

• H04W36/0083

  Determination of parameters used for hand-off, e.g. generation or modification of neighbour cell lists · CPC title

• H04W36/34 Primary

  Reselection control · CPC title

• H04W36/083

  wherein at least one of the access points is a moving node · CPC title

• H04W36/00837

  Determination of triggering parameters for hand-off · CPC title