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1. WO2020112011 - METHOD AND WIRELESS DEVICE FOR HANDLING HANDOVER

Note: Text based on automatic Optical Character Recognition processes. Please use the PDF version for legal matters

[ EN ]

Claims

1. A method performed by a wireless device (100) when operating in a wireless network (102), for handling handover from a source cell (104) to a target cell when the wireless device has obtained and stored (200) a handover configuration for at least one target cell X (106A-C), the method comprising:

- performing (204) cell selection upon detecting (202) a communication failure,

- initiating (208) handover to one of the at least one target cell X (106A-C) when that target cell was selected in said cell selection, by applying the stored handover configuration of the selected cell, and

- initiating (210) an RRC re-establishment procedure when none of the at least one target cell X was selected in said cell selection.

2. A method according to claim 1 , wherein each stored handover configuration is a conditional handover configuration.

3. A method according to claim 1 or 2, wherein said communication failure comprises any of: handover failure, radio link failure, and failure to comply with a configuration for accessing the wireless network.

4. A method according to any of claims 1 -3, wherein said communication failure is declared when a predefined timer expires, which timer has been started when the communication failure was first detected.

5. A method according to any of claims 1 -4, wherein each stored handover configuration is an RRC configuration comprising an RRCReconfiguration with reconfigurationWithSync or an RRCConnectionReconfiguration with

mobilityControllnfo.

6. A wireless device (300) arranged to, when operating in a wireless network, handle handover from a source cell to a target cell when the wireless device has obtained and stored a handover configuration for at least one target cell X, wherein the wireless device is configured to:

- perform (300A) cell selection upon detecting a communication failure,

- initiate (300B) handover to one of the at least one target cell X (106A-C) when that target cell was selected in said cell selection, by applying the stored handover configuration of the selected cell, and

- initiate (300C) an RRC re-establishment procedure when none of the at least one target cell X was selected in said cell selection.

7. A wireless device (300) according to claim 6, wherein each stored handover configuration is a conditional handover configuration.

8. A wireless device (300) according to claim 6 or 7, wherein said communication failure comprises any of: handover failure, radio link failure, and failure to comply with a configuration for accessing the wireless network.

9. A wireless device (300) according to any of claims 6-8, wherein the wireless device is configured to declare said communication failure when a predefined timer expires, which timer has been started when the communication failure was first detected.

10. A wireless device (300) according to any of claims 6-9, wherein each stored handover configuration is an RRC configuration comprising an

RRCReconfiguration with reconfigurationWithSync or an

RRCConnectionReconfiguration with mobilityControllnfo.

11. A computer program comprising instructions which, when executed on at least one processor, cause the at least one processor to carry out the method according to any one of claims 1 -5.

12. A carrier containing the computer program of claim 11 , wherein the carrier is one of an electronic signal, optical signal, radio signal, or computer readable storage medium.