Method for processing beam failure, and terminal

Patent metadata

Field	Value
Publication number	US-2021014104-A1
Application number	US-202017035080-A
Country	US
Kind code	A1
Filing date	Sep 28, 2020
Priority date	Mar 28, 2018
Publication date	Jan 14, 2021
Grant date	—

Abstract

A method for processing beam failure and a terminal are provided by the present disclosure. The method includes: determining a BFR event, wherein the beam failure recovery event includes an abnormality occurring in a BFR procedure or at least two cells both undergoing a BFR; executing a specific operation according to the BFR event.

First claim

What is claimed is:

1 . A method for processing beam failure, applied to a terminal, comprising:
determining a beam failure recovery event, wherein the beam failure recovery event comprises that an abnormality occurs in a beam failure recovery procedure or at least two cells both undergo a beam failure recovery; executing a specific operation according to the beam failure recovery event.

2 . The method according to claim 1 , wherein that the abnormality occurs in the beam failure recovery procedure comprises that a beam failure occurs in a first cell during a beam failure recovery procedure performed in the first cell, or a beam failure occurs in a second cell during the beam failure recovery procedure performed in the first cell.

3 . The method according to claim 2 , wherein, in a case that the beam failure occurs in the first cell during the beam failure recovery procedure performed in the first cell, the specific operation comprises at least one of:
stopping a beam failure recovery procedure being performed in the first cell; stopping a beam failure recovery procedure being performed in the second cell; stopping a beam failure recovery procedure being performed in the first cell and the second cell; performing in the first cell a beam failure recovery for the beam failure occurring in the first cell; reporting to an upper layer the beam failure occurring in the first cell; performing in the first cell a beam failure recovery for the beam failure occurring in the first cell, and continuing performing a beam failure recovery procedure being performed in the first cell; performing in the first cell a beam failure recovery for the beam failure occurring in the first cell after a beam failure recovery procedure being performed in the first cell is finished; ignoring the beam failure occurring in the first cell;
in a case that the beam failure occurs in the second cell during the beam failure recovery procedure performed in the first cell, the specific operation comprises at least one of:
ignoring the beam failure occurring in the second cell;
performing a beam failure recovery for the beam failure occurring in the second cell;
performing in the second cell a beam failure recovery, and continuing performing a beam failure recovery procedure being performed in the first cell;
performing in the second cell a beam failure recovery after a beam failure recovery procedure being performed in the first cell is finished.

4 . The method according to claim 3 , wherein in case of reporting to the upper layer the beam failure occurring in the first cell, a radio link failure (RLF) is triggered, an out-of-sync counter is incremented, or a timer corresponding to a radio link monitoring (RLM) or RLF is started;
the ignoring the beam failure occurring in the second cell comprises at least one of:
not triggering a beam failure recovery procedure in the second cell;
not triggering in the first cell a beam failure recovery procedure for the beam failure occurring in the second cell;
not triggering in the first cell and the second cell a beam failure recovery procedure for the beam failure occurring in the second cell;
the ignoring the beam failure occurring in the first cell comprises at least one of:
not triggering a beam failure recovery in the first cell;
not triggering in the second cell a beam failure recovery procedure for the beam failure occurring in the first cell;
not triggering in the first cell and the second cell a beam failure recovery procedure for the beam failure occurring in the first cell;
the performing the beam failure recovery for the beam failure occurring in the second cell comprises at least one of:
triggering in the first cell a beam failure recovery procedure for the beam failure occurring in the second cell;
triggering in the second cell a beam failure recovery procedure for the beam failure occurring in the second cell;
triggering in the first cell and the second cell a beam failure recovery procedure for the beam failure occurring in the second cell.

5 . The method according to claim 2 , wherein the first cell is a primary cell, and the second cell is a secondary cell (Scell); or
the first cell is an Scell, and the second cell is a primary cell; or the first cell is an Scell, and the second cell is another Scell, wherein the primary cell comprises at least one of: a primary cell (Pcell), a Pcell in a master cell group (MCG), a primary secondary cell (PScell) in a secondary cell group (SCG) and a special cell (Spcell).

6 . The method according to claim 1 , wherein that the abnormality occurs in the beam failure recovery procedure comprises that the second cell undergoes a beam failure before a preamble is transmitted in the first cell, wherein the preamble is a preamble in a beam failure recovery procedure performed in the first cell after the first cell undergoes a beam failure;
that the at least two cells both undergo the beam failure recovery comprises that both the first cell and the second cell undergo a beam failure recovery.

7 . The method according to claim 6 , wherein the specific operation comprises at least one of:
performing in a primary cell a beam failure recovery for the primary cell; performing in the primary cell a beam failure recovery for a secondary cell (S cell); performing in a cell with a specific candidate beam a beam failure recovery for the cell, wherein a random access resource corresponding to the specific candidate beam is a contention-free random access (CFRA) resource; performing in the Scell a beam failure recovery for the Scell; performing in the Scell a beam failure recovery for the primary cell; performing a beam failure recovery in the primary cell and the Scell simultaneously; performing in the primary cell a beam failure recovery for the primary cell and after the beam failure recovery is finished, performing in the Scell a beam failure recovery for the Scell, wherein the first cell is the primary cell and the second cell is the Scell, or the first cell is the Scell and the second cell is the primary cell.

8 . The method according to claim 7 , wherein the performing in the primary cell the beam failure recovery for the primary cell comprises:
in a case that multiple cells each have a candidate beam whose corresponding random access resource is a CFRA resource, performing in the primary cell the beam failure recovery for the primary cell; the performing in the Scell the beam failure recovery for the Scell comprises: in a case that multiple cells each have a candidate beam whose corresponding random access resource is a CFRA resource, performing in the Scell the beam failure recovery for the Scell, wherein, in the specific operation, in a case that a beam failure recovery is performed in a cell, a beam failure in another cell is ignored or a beam failure recovery in another cell is prevented; or in a case that an uplink transmission power of the terminal does not support preamble transmission in two cells, a beam failure recovery is only performed in one cell in the specific operation; or in a case that an uplink transmission power of the terminal supports preamble transmission in two cells, a beam failure recovery is performed in the two cells simultaneously in the specific operation.

9 . The method according to claim 1 , wherein, if that the abnormality occurs in the beam failure recovery procedure comprises that a beam failure recovery in a primary cell is prevented or ignored, the specific operation comprises cancelling at least one of following operations:
triggering an indication of a beam failure recovery of the primary cell to an upper layer; triggering an RLF by an upper layer; starting a ti

Assignees

• Vivo Mobile Communication Co Ltd

Inventors

• Chen Li

Classifications

• H04B7/06964 Primary

  Re-selection of one or more beams after beam failure · CPC title

• H04L41/0654 Primary

  using network fault recovery (ring fault isolation or reconfiguration in loop networks without recovery actions by a network management system H04L12/437) · CPC title

• H04W74/0838

  using contention-free random access [CFRA] · CPC title

• H04W74/0833

  Random access procedures, e.g. with 4-step access · CPC title

• H04W76/18 Primary

  Management of setup rejection or failure · CPC title