METHOD AND APPARATUS FOR PROCESSING BEAM FAILURE RECOVERY

• US 20190327769A1
• Filed: 04/04/2019
• Published: 10/24/2019
• Est. Priority Date: 04/05/2018
• Status: Abandoned Application

• Current Assignee: Innovative Tech Lab Company Limited
• Original Assignee: Innovative Tech Lab Company Limited
• Inventors: YANG, Hyosun, KWON, Kibum
• Application Number:
  US16/374,899
• Publication Number:
  US 20190327769A1
• Time in Patent Office: Days
• CPC Class Codes: H04B 7/0695 using beam selection
• CPC Class Codes: H04B 7/088 using beam selection
• 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 56/001 Synchronization between nodes
• CPC Class Codes: H04W 72/046 the resource being in the space domain, e.g. beams
• CPC Class Codes: H04W 74/02 Hybrid access
• CPC Class Codes: H04W 74/0833 Random access procedures, e.g. with 4-step access
• CPC Class Codes: H04W 76/19 Connection re-establishment
• CPC Class Codes: H04W 76/27 Transitions between radio resource control [RRC] states
• CPC Class Codes: H04W 80/02 Data link layer protocols

Abstract

A method, apparatus, and system for a wireless communication are disclosed. A wireless device may determine a beam failure recovery (BFR) associated with a secondary serving cell (SCell). The wireless device may perform, based on the BFR, a random access procedure for the BFR associated with the SCell. The wireless device may select a random access preamble associated with a synchronization signal block (SSB) of the SCell, stop a first bandwidth part (BWP) inactivity timer associated with the SCell, and run a second BWP inactivity timer associated with a special cell (SpCell). The wireless device may receive, via an active BWP of the SCell, a random access response associated with the random access preamble.

Claims

1. A method comprising:

determining, by a wireless device, a beam failure recovery (BFR) associated with a secondary serving cell (SCell);

performing, based on the BFR, a random access procedure for the BFR associated with the SCell, wherein performing the random access procedure comprises;

selecting a random access preamble associated with a synchronization signal block (SSB) of the SCell;

stopping a first bandwidth part (BWP) inactivity timer associated with the SCell; and

running a second BWP inactivity timer associated with a special cell (SpCell); and

receiving, via an active BWP of the SCell, a random access response associated with the random access preamble.

2. The method of claim 1, further comprising:

determining an expiration of the second BWP inactivity timer;

performing a BWP switching, of the SpCell, from an active BWP of the SpCell to a default BWP of the SpCell or to an initial BWP of the SpCell; and

monitoring, during or after the BWP switching and via the active BWP of the SCell, the random access response.

3. The method of claim 1, wherein the stopping of the first BWP inactivity timer prevents a BWP switching of the active BWP of the SCell.

4. The method of claim 1, further comprising:

determining, by the wireless device, a second BFR associated with the SpCell;

performing, based on the second BFR, a second random access procedure for the second BFR associated with the SpCell, wherein performing the second random access procedure comprises;

selecting a second random access preamble associated with an SSB of the SpCell; and

stopping the second BWP inactivity timer; and

receiving, via an active BWP of the SpCell, a second random access response associated with the second random access preamble.

5. The method of claim 1, wherein the SSB is associated with a candidate beam of the SCell, and wherein the selecting of the random access preamble indicates a selection of the candidate beam of the SCell for the BFR.

6. The method of claim 1, wherein the determining the BFR comprises:

receiving, via a serving beam of the SCell, a downlink signal; and

determining, based on reference signal received power (RSRP) of the downlink signal, one or more beam failure instances associated with the serving beam of the SCell.

7. The method of claim 1, wherein the determining the BFR comprises determining that a number of one or more beam failure instances satisfies beamFailureInstanceMaxCount.

8. The method of claim 1, wherein the random access response is scrambled based on a cell radio network temporary identifier (C-RNTI).

9. The method of claim 1, further comprising:

determining, based on the random access response, that the BFR is successful; and

restarting, based on the determining that the BFR is successful, the stopped first BWP inactivity timer.

10. A method comprising:

receiving, by a wireless device and via a secondary serving cell (SCell), a downlink signal;

determining, based on the downlink signal, one or more beam failure instances associated with the SCell;

performing, based on the one or more beam failure instances, a random access procedure for a beam failure recovery (BFR) associated with the SCell, wherein the performing the random access procedure comprises;

selecting a random access preamble associated with a candidate beam of the SCell; and

stopping a first bandwidth part (BWP) inactivity timer associated with the SCell; and

monitoring, via an active BWP of the SCell and while running a second BWP inactivity timer associated with a special cell (SpCell), a random access response associated with the random access preamble.

11. The method of claim 10, further comprising:

determining, while monitoring the random access response, an expiration of the second BWP inactivity timer associated with the SpCell; and

performing, based on the expiration, a BWP switching, of the SpCell, from an active BWP of the SpCell to a default BWP of the SpCell or to an initial BWP of the SpCell.

12. The method of claim 10, wherein the stopping of the first BWP inactivity timer prevents a BWP switching of the active BWP of the SCell.

13. The method of claim 10, further comprising:

determining, by the wireless device, a second BFR associated with the SpCell;

performing, based on the second BFR, a second random access procedure for the second BFR associated with the SpCell, wherein performing the second random access procedure comprises;

selecting a second random access preamble associated with a candidate beam of the SpCell; and

stopping the second BWP inactivity timer; and

receiving, via an active BWP of the SpCell, a second random access response associated with the second random access preamble.

14. The method of claim 10, wherein the selecting of the random access preamble indicates a selection of the candidate beam of the SCell for the BFR.

15. A wireless device comprising:

one or more processors; and

memory storing instructions that, when executed by the one or more processors, cause the wireless device to;

determine a beam failure recovery (BFR) associated with a secondary serving cell (SCell);

perform, based on the BFR, a random access procedure for the BFR associated with the SCell, wherein performing the random access procedure comprises;

selecting a random access preamble associated with a synchronization signal block (SSB) of the SCell;

stopping a first bandwidth part (BWP) inactivity timer associated with the SCell; and

running a second BWP inactivity timer associated with a special cell (SpCell); and

receive, via an active BWP of the SCell, a random access response associated with the random access preamble.

16. The wireless device of claim 15, wherein the instructions, when executed by the one or more processors, cause the wireless device to:

determine an expiration of the second BWP inactivity timer;

perform a BWP switching, of the SpCell, from an active BWP of the SpCell to a default BWP of the SpCell or to an initial BWP of the SpCell; and

monitor, during or after the BWP switching and via the active BWP of the SCell, the random access response.

17. The wireless device of claim 15, wherein the stopping of the first BWP inactivity timer prevents a BWP switching of the active BWP of the SCell.

18. The wireless device of claim 15, wherein the instructions, when executed by the one or more processors, cause the wireless device to:

determine a second BFR associated with the SpCell;

perform, based on the second BFR, a second random access procedure for the second BFR associated with the SpCell, wherein performing the second random access procedure comprises;

selecting a second random access preamble associated with an SSB of the SpCell; and

stopping the second BWP inactivity timer; and

receive, via an active BWP of the SpCell, a second random access response associated with the second random access preamble.

19. The wireless device of claim 15, wherein the SSB is associated with a candidate beam of the SCell, and wherein the selecting of the random access preamble indicates a selection of the candidate beam of the SCell for the BFR.

20. The wireless device of claim 15, wherein instructions, when executed by the one or more processors, cause the wireless device to determine the BFR by:

receiving, via a serving beam of the SCell, a downlink signal; and

determining, based on reference signal received power (RSRP) of the downlink signal, one or more beam failure instances associated with the serving beam of the SCell.