Network nodes and methods therein for handling communications in a radio communications network
A method performed by a network node ( 111, 112 ) for handling communications in a radio communications network ( 100 ) is provided. The network node ( 111, 112 ) is configured to be in the radio communications network ( 100 ). The network node ( 111, 112 ) receives a report of a radio link failure, RLF, of a user equipment, UE, which report comprises an identity of a re-establishment cell, configures an RLF indication comprising the received report to further comprise a first indication of the cell identity of the current cell the UE is connected and/or a second indication of a result of a comparison between the cell identity of the cell the UE was connected to upon sending the RLF report and the identity of the re-establishment cell, and sends the RLF indication to another network node ( 110 ). A network node ( 111, 112 ) for handling communications in a radio communications network ( 100 ) is also provided. Furthermore, a corresponding network node ( 110 ) for handling communications in a radio communications network and a method performed therein are also provided.
1. A method performed by a network node for handling communications in a radio communications network, the network node being configured to be in the radio communications network, the method comprising:
receiving a report of a radio link failure (RLF) of a user equipment (UE), which report comprises an identity of a re-establishment cell; and
configuring an RLF indication, comprising the RLF report, to further comprise a first indication of the cell identity of the cell the UE was connected to upon sending the RLF report and/or a second indication of a result of a comparison between the cell identity of the cell the UE was connected to upon sending the RLF report and the identity of the re-establishment cell; and
sending the RLF indication to another network node.
2. The method of claim 1 , wherein the RLF indication is a X2AP RLF INDICATION message.
3. The method of claim 1 , wherein the second indication is configured in a dedicated Information Element (IE) in the RLF indication.
4. The method of claim 3 , further comprising comparing the identity of the re-establishment cell in the received report with the cell identity of the cell the UE was connected to upon sending the RLF report.
5. The method of claim 4 , wherein the dedicated IE is configured with a first value indicating a match when the result of the comparison is a match and with a second value indicating not a match when the result of the comparison is not a match.
6. The method of claim 5 , wherein the dedicated IE is configured with the first value indicating a match when the UE has been handed over from the re-establishment cell to the current cell the UE is connected to.
7. The method of claim 1 , wherein the first indication is configured in an existing IE in the RLF indication.
8. The method of claim 7 , wherein the existing IE in the RLF indication is the Re-establishment cell ECGI IE of the X2AP RLF INDICATION message.
9. The method of claim 1 , wherein the other network node is the network node that served the UE when the RLF occurred.
10. A method performed by a network node for handling communications in a radio communications network, the network node being configured to be in the radio communications network, the network node comprising;
receiving, from another network node, an RLF indication comprising a report of a radio link failure (RLF) of a user equipment (UE), which report comprises an identity of a re-establishment cell, said RLF indication further comprising a first indication of the cell identity of the cell the UE was connected to upon sending the RLF report and/or a second indication of a result of a comparison between the cell identity of the cell the UE was connected to upon sending the RLF report and the identity of the re-establishment cell; and
determining, based on the first indication and/or the second indication, whether or not to consider the re-establishment cell indicated in the report of the RLF indication when performing adjustments relating to handover in a cell served by the network node.
11. The method of claim 10 , wherein the determining further comprises, when the second indication indicates that the result of the comparison is a match, including the re-establishment cell when performing the adjustments relating to handover in a cell served by the network node.
12. The method of claim 10 , wherein the determining further comprises, when the second indication indicates that the result of the comparison is not a match, determining whether or not to discard the identity of the re-establishment cell in the received report and exclude the re-establishment cell when performing the adjustments relating to handover in a cell served by the network node.
13. The method of claim 12 , wherein the determining further comprises, when the result of the comparison is not a match and/or the second indication indicates that the result of the comparison is not a match, disregarding any previously received RLF indications relating to the same RLF or UE when performing the adjustments relating to handover in a cell served by the network node.
14. The method of claim 10 , wherein the determining further comprises comparing the identity of the re-establishment cell comprised in the received report with the first indication indicating the cell identity of the cell the UE was connected to upon sending the RLF report.
15. The method of claim 14 , wherein the determining further comprises, when the result of the comparison is a match, including the re-establishment cell when performing the adjustments relating to handover in a cell served by the network node.
16. The method of claim 14 , wherein the determining further comprises, when the result of the comparison is not a match, determining whether or not to discard the identity of the re-establishment cell in the received report and exclude the re-establishment cell when performing the adjustments relating to handover in a cell served by the network node.
17. The method of claim 10 , wherein, when the first indication of the cell identity of the cell the UE was connected to upon sending the RLF report is set to a particular determined value, the determining further comprises ignoring the identity of the re-establishment cell in the received report and refraining from performing the adjustments relating to handover in a cell served by the network node based on the first or second indication.
18. The method of claim 10 , wherein the adjustments relating to handover in a cell served by the network node comprise performing a Mobility Robustness Optimization (MRO) analysis and determining a trigger point for handover of the served by the network node.
19. A network node for handling communications in a radio communications network, wherein the network node is configured to be in the radio communications network and comprises:
processing circuitry, and
memory operatively coupled to said processing circuitry and storing program code for execution by the processing circuitry, whereby said processing circuitry is configured to:
receive a report of a radio link failure (RLF) of a user equipment (UE), which report comprises an identity of a re-establishment cell;
configure an RLF indication comprising the received report to further comprise a first indication of the cell identity of the cell the UE was connected to upon sending the RLF report and/or a second indication of a result of a comparison between the cell identity of the cell the UE was connected to upon sending the RLF report and the identity of the re-establishment cell; and
send the RLF indication to another network node.
20. The network node of claim 19 , wherein the RLF indication is a X2AP RLF INDICATION message.
21. The network node of claim 19 , wherein the processing circuitry is further configured to configure the second indication in a dedicated Information Element (IE) in the RLF indication.
22. The network node of claim 21 , wherein the processing circuitry is further configured to compare the identity of the re-establishment cell in the received report with the cell identity of the cell the UE was connected to upon sending the RLF report.
23. The network node of claim 22 , wherein the processing circuitry is further configured to configure the dedicated IE with a first value indicating a match when the result of the comparison is a match and with a second value indicating not a match when the result of the comparison is not a match.
24. The network node of claim 23 , wherein the processing circuitry is further configured to configure the dedicated IE with the first value indicating a match when the UE has been handed over from the re-establishment cell to the current cell the UE is connected to.
25. The network node of claim 19 , wherein the processing circuitry is further configured to configure the first indication in an existing IE in the RLF indication.
26. The network node of claim 25 , wherein the existing IE in the RLF indication is the Re-establishment cell ECGI IE of the X2AP RLF INDICATION message.
27. The network node of claim 19 , wherein the other network node is the network node that served the UE when the RLF occurred.
28. A network node for handling communications in a radio communications network, wherein the network node is configured to be in the radio communications network, the network node comprising:
processing circuitry, and
memory operatively coupled to said processing circuitry and storing program code for execution by the processing circuitry, whereby said processing circuitry is configured to:
receive, from another network node, an RLF indication comprising a report of a radio link failure (RLF) of a user equipment (UE), which report comprises an identity of a re-establishment cell, said RLF indication further comprising a first indication of the cell identity of the cell the UE was connected to upon sending the RLF report and/or a second indication of a result of a comparison between the cell identity of the cell the UE was connected to upon sending the RLF report and the identity of the re-establishment cell; and
determine, based on the first indication and/or the second indication, whether or not to consider the re-establishment cell indicated in the report of the RLF indication when performing adjustments relating to handover in a cell served by the network node.
29. The network node of claim 28 , wherein the processing circuitry is further configured to, when the second indication indicates that the result of the comparison is a match, include the re-establishment cell when performing the adjustments relating to handover in a cell served by the network node.
30. The network node of claim 28 , wherein the processing circuitry is further configured to, when the second indication indicates that the result of the comparison is not a match, determine whether or not to discard the identity of the re-establishment cell in the received report and exclude the re-establishment cell when performing the adjustments relating to handover in a cell served by the network node.
31. The network node of claim 30 , wherein the processing circuitry is further configured to, when the result of the comparison is not a match and/or the second indication indicates that the result of the comparison is not a match, disregard any previously received RLF indications relating to the same RLF or UE when performing the adjustments relating to handover in a cell served by the network node.
32. The network node of claim 28 , wherein the processing circuitry is further configured to compare the identity of the re-establishment cell comprised in the received report with the first indication indicating the cell identity of the cell the UE was connected to upon sending the RLF report.
33. The network node of claim 32 , wherein the processing circuitry is further configured to when the result of the comparison is a match, include the re-establishment cell when performing the adjustments relating to handover in a cell served by the network node.
34. The network node of claim 32 , wherein the processing circuitry is further configured to, when the result of the comparison is not a match, determine whether or not to discard the identity of the re-establishment cell in the received report and exclude the re-establishment cell when performing the adjustments relating to handover in a cell served by the network node.
35. The network node of claim 28 , wherein the processing circuitry is further configured to, when the first indication of the cell identity of the cell the UE was connected to upon sending the RLF report is set to a particular determined value, ignore the identity of the re-establishment cell in the received report and refrain from performing the adjustments relating to handover in a cell served by the network node based on the first or second indication.
36. The network node of claim 28 , wherein the adjustments relating to handover in a cell served by the network node comprise performing a Mobility Robustness Optimization (MRO) analysis and determining a trigger point for handover of the served by the network node.