WIRELESS DEVICE, RADIO NETWORK NODE, AND METHODS PERFORMED THEREIN FOR HANDLING COMMUNICATION IN A WIRELESS COMMUNICATION NETWORK

• US 20190320355A1
• Filed: 03/22/2018
• Published: 10/17/2019
• Est. Priority Date: 03/24/2017
• Status: Abandoned Application

• Current Assignee: Telefonaktiebolaget LM Ericsson
• Original Assignee: Telefonaktiebolaget LM Ericsson
• Inventors: Da Silva, Icaro Leonardo J.
• Application Number:
  US16/063,118
• Publication Number:
  US 20190320355A1
• Time in Patent Office: Days
• CPC Class Codes: H04L 1/0026 Transmission of channel quality indication
• CPC Class Codes: H04L 41/0668 by dynamic selection of recovery network elements, e.g. replacement by the most appropriate element after failure
• CPC Class Codes: H04L 5/0048 Allocation of pilot signals, i.e. of signals known to the receiver
• CPC Class Codes: H04L 5/0051 of dedicated pilots, i.e. pilots destined for a single user or terminal
• CPC Class Codes: H04W 16/28 using beam steering
• CPC Class Codes: H04W 24/08 Testing, supervising or monitoring using real traffic
• CPC Class Codes: H04W 36/0061 of neighbour cell information
• CPC Class Codes: H04W 36/0085 Hand-off measurements
• CPC Class Codes: H04W 36/06 Reselecting a communication resource in the serving access point
• CPC Class Codes: H04W 72/046 the resource being in the space domain, e.g. beams
• CPC Class Codes: H04W 72/23 in the downlink direction of a wireless link, i.e. towards a terminal
• CPC Class Codes: H04W 74/0833 Random access procedures, e.g. with 4-step access
• CPC Class Codes: H04W 76/19 Connection re-establishment

Abstract

Some embodiments herein relate to a method performed by a wireless device for handling communication of the wireless device in a wireless communication network, wherein the wireless device is served by a radio network node. The wireless device performs a beam tracking of one or more beams for a set of detected neighbour cells for tracking one or more best beams of respective neighbour cell based on measured signal strength or measured signal quality. The wireless device further receives an indication from the radio network node, wherein the indication indicates a target cell for the wireless device. When the target cell is in the set of detected neighbour cells, the wireless device further initiates a random access procedure associated with a best target beam for the target cell, wherein the best target beam is selected based on the beam tracking performed prior to receiving the indication.

Claims

1. A method performed by a wireless device for handling communication of the wireless device in a wireless communication network, wherein the wireless device is served by a radio network node, the method comprising:

performing a beam tracking of one or more beams for a set of detected neighbour cells for tracking one or more best beams of respective neighbour cell based on measured signal strength or measured signal quality;

receiving an indication from the radio network node, wherein the indication indicates a target cell for the wireless device; and

when the target cell is in the set of detected neighbour cells,

initiating a random access procedure associated with at least one target beam for the target cell, wherein the at least one target beam is selected based on the beam tracking performed prior to receiving the indication.

2. The method according to claim 1, wherein performing the beam tracking comprises performing measurements on reference signals of the one or more beams for the set of detected neighbour cells, and wherein the at least one target beam for the random access procedure is selected based on the signal strength or quality of respective beam.

3. The method according to claim 1, wherein the at least one target beam is selected further based on a list of allowed beams for the target cell for the wireless device.

4. The method according to claim 1, further comprising

selecting and storing over a time interval the one or more beams for each neighbour cell based on the performed beam tracking.

5. The method according to claim 4, wherein the beam tracking comprises performing a full sweep of the one or more beams before selecting the one or more beams in each neighbour cell.

6. The method according to claim 1, wherein the random access procedure is associated with the at least one target beam by random access channel resources allocated for the at least one target beam.

7. The method according to claim 1, wherein the beam tracking comprises obtaining additional information, wherein the additional information is used to perform the random access procedure.

8. The method according to claim 1, wherein an occurrence of a mobility event triggers the wireless device to initiate the beam tracking.

9. The method according to claim 1, further comprising

receiving configuration data from the radio network node, wherein the configuration data indicates that the wireless device is to perform beam tracking of one or more beams for a set of detected neighbour cells and upon reception of the indication, to initiate a random access procedure associated with at least one target beam for a target cell, wherein the at least one target beam is selected based on a performed beam tracking prior to receiving the indication, wherein the indication indicates the target cell for the wireless device.

10. The method according to claim 1, wherein measurements of the beam tracking is performed at a different time scale compared to measurements used for radio resource management, RRM, purposes, wherein the measurements are snapshots closer in time to one another than the measurements used for the RRM purposes.

11. A method performed by a radio network node for handling communication of a wireless device in a wireless communication network, wherein the radio network node serves the wireless device, the method comprising:

transmitting configuration data to the wireless device, wherein the configuration data indicates that the wireless device is to perform beam tracking of one or more best beams for a set of detected neighbour cells and upon reception of an indication, to initiate a random access procedure associated with at least one target beam for a target cell, wherein the at least one target beam is selected based on a performed beam tracking prior to receiving the indication, wherein the indication indicates a target cell for the wireless device.

12. The method according to the claim 11, wherein the configuration data comprises one or more filter parameters for measurements of the beam tracking and/or the configuration data defines the wireless device to monitor more beams of one candidate cell than for another candidate cell.

13-26. -26. (canceled)

27. A wireless device for handling communication of the wireless device in a wireless communication network, wherein the wireless communication network comprises a radio network node being configured to serve the wireless device, and wherein the wireless device comprises processing circuitry and a memory, said memory comprising instructions executable by said processing circuitry whereby said wireless device is operative to:

perform a beam tracking of one or more beams for a set of detected neighbour cells for tracking one or more best beams of respective neighbour cell based on measured signal strength or measured signal quality;

receive an indication from the radio network node, wherein the indication indicates a target cell for the wireless device; and

, when the target cell is in the set of detected neighbour cells, to

initiate a random access procedure associated with at least one target beam for the target cell, and wherein the wireless device is operative to select the at least one target beam based on the beam tracking performed prior to receiving the indication.

28. The wireless device according to claim 27, wherein the wireless device is operative to perform the beam tracking by being operative to perform measurements on reference signals of the one or more beams for the set of detected neighbour cells, and wherein the wireless device is operative to select the at least one target beam for the random access procedure based on the signal strength or quality of respective beam.

29. The wireless device according to claim 27, wherein the wireless device is operative to select the at least one target beam further based on a list of allowed beams for the target cell for the wireless device.

30. The wireless device according to claim 27, further being operative to select and store over a time interval the one or more beams for each neighbour cell based on the performed beam tracking.

31. The wireless device according to claim 30, wherein the wireless device is operative to perform the beam tracking by being operative to perform a full sweep of beams before selecting the one or more beams in each neighbour cell.

32. The wireless device according to claim 27, wherein the random access procedure is associated with the at least one target beam by random access channel resources allocated for the at least one target beam.

33. The wireless device according to claim 27, wherein the wireless device is operative to obtain additional information during the beam tracking, wherein the additional information is used to perform the random access procedure.

34. The wireless device according to claim 27, wherein the wireless device is operative to initiate the beam tracking being triggered by an occurrence of a mobility event.

35. The wireless device according to claim 27, wherein the wireless device is operative to

receive configuration data from the radio network node, wherein the configuration data indicates that the wireless device is to perform beam tracking of one or more beams for a set of detected neighbour cells and upon reception of the indication to initiate a random access procedure associated with at least one target beam for a target cell, wherein the at least one target beam is selected based on a performed beam tracking prior to receiving the indication, wherein the indication indicates the target cell for the wireless device.

36. The wireless device according to claim 27, wherein the wireless device is operative to perform measurements of the beam tracking at a different time scale compared to measurements used for radio resource management, RRM, purposes, wherein the measurements are snapshots closer in time to one another than the measurements used for the RRM purposes.

37. A radio network node for handling communication of a wireless device in a wireless communication network, wherein the radio network node comprises processing circuitry and a memory, said memory comprising instructions executable by said processing circuitry whereby said radio network node is operative to serve the wireless device, and to:

transmit configuration data to the wireless device, wherein the configuration data indicates that the wireless device is to perform beam tracking of one or more beams for a set of detected neighbour cells and to, upon reception of an indication, initiate a random access procedure associated with at least one target beam for a target cell, wherein the at least one target beam is selected based on a performed beam tracking prior to receiving the indication, and wherein the indication indicates the at least one target cell for the wireless device.

38. The radio network node according to the claim 37, wherein the configuration data comprises one or more filter parameters for measurements of the beam tracking and/or the configuration data defines the wireless device to monitor more beams of one candidate cell than for another candidate cell.