Electronic device and method for beam failure recovery
Aspects of the disclosure provide an electronic device including processing circuitry and a method for beam failure recovery (BFR). When beam failure is determined to occur on at least one of a plurality of cells configured for the electronic device, the processing circuitry can send a BFR scheduling request (SR) to a network. The BFR SR can indicate the beam failure and requesting resources to report the beam failure. The processing circuitry can receive priority scheduling for the resources from the network. The processing circuitry can send a BFR request (BFRQ) using the resources. The BFRQ can indicate cell information of the at least one of the plurality of cells and new beam information of one or more new candidate beams for the at least one of the plurality of cells.
1. A method for beam failure recovery (BFR), comprising:
when beam failure is determined to occur on a secondary cell (SCell) in a plurality of cells configured for an electronic device,
sending a BFR scheduling request (SR) to a network using a Physical Uplink Control Channel (PUCCH) configured for a primary cell (PCell) in the plurality of cells, the BFR SR indicating the beam failure and requesting resources to report the beam failure;
receiving priority scheduling for the resources from the network using a channel configured for the PCell, the resources including aperiodic channel-state information (A-CSI) that indicates a cell index of the SCell and a new beam index for a new candidate beam for the SCell;
sending a BFR request (BFRQ) using the resources by sending the A-CSI on a PUCCH configured for the PCell, the BFRQ indicating the cell index of the SCell and the new beam index of the new candidate beam for the SCell; and
receiving a BFR response (BFRR) from the network.
2. The method according to claim 1 , wherein
the plurality of cells further includes another SCell; and
when beam failure is determined to occur on the other SCell, the method further includes:
sending another BFR SR to the network using the PUCCH configured for the PCell;
receiving priority scheduling for a BFRQ Medium Access Control (MAC) control element (CE) that indicates a cell index of the other SCell and another new beam index for a new candidate beam for the other SCell;
sending another BFRQ by sending the BFRQ MAC CE using a PUSCH configured for the PCell, the other BFRQ indicating the cell index of the other SCell and the other new beam index of the new candidate beam for the other SCell; and
receiving another BFRR from the network.
3. The method according to claim 1 , wherein
the BFR SR has a BFR SR configuration including a period and an offset.
4. The method according to claim 3 , wherein
the BFR SR configuration is associated with a PUCCH format 0 that includes multiple cyclic shifts, one or more of the multiple cyclic shifts being configured for at least one of: 1) the BFR SR and 2) the BFR SR and at least one of hybrid automatic repeat requests (HARQs).
5. The method according to claim 3 , wherein sending the BFR SR further comprises:
when the BFR SR is scheduled at a same time with a SR, sending the BFR SR prior to sending the SR or sending the BFR SR and the SR simultaneously.
6. The method according to claim 3 , wherein
the plurality of cells includes a first subset of cells and a second subset of cells;
the BFR SR configuration is configured for the first subset of cells to report a beam failure for the first subset of cells, the first subset of cells including the SCell; and
another BFR SR configuration is configured for the second subset of cells to report a beam failure for the second subset of cells.
7. A method for beam failure recovery (BFR), comprising:
determining that beam failure occurs on a primary cell (PCell) when at least one of one or more serving control channels fails, the PCell being included in a plurality of cells configured for an electronic device and being configured with the one or more serving control channels to communicate with a network; and
when the beam failure is determined to occur on the PCell,
sending a BFR scheduling request (SR) to the network using a Physical Uplink Control Channel (PUCCH) configured for the PCell, the BFR SR indicating the beam failure and requesting resources to report the beam failure;
receiving priority scheduling for the resources from the network using a channel configured for the PCell, the resources including a BFR request (BFRQ) Medium Access Control (MAC) control element (CE) that indicates a cell index of the PCell and a new beam index for a new candidate beam for the PCell;
sending a BFRQ using the resources to the network by sending the BFRQ MAC CE using a PUSCH configured for the PCell, the BFRQ indicating the cell index of the PCell and the new beam index of the new candidate beam for the PCell; and
receiving a new beam update from the network.
8. The method according to claim 7 , wherein
the BFR SR has a BFR SR configuration including a period and an offset.
9. The method according to claim 8 , wherein
the BFR SR configuration is associated with a PUCCH format 0 that includes multiple cyclic shifts, one or more of the multiple cyclic shifts being configured for at least one of: 1) the BFR SR and 2) the BFR SR and at least one of hybrid automatic repeat requests (HARQs).
10. The method according to claim 8 , wherein sending the BFR SR further comprises:
when the BFR SR is scheduled at a same time with a SR, sending the BFR SR prior to sending the SR or sending the BFR SR and the SR simultaneously.
11. The method according to claim 8 , wherein
the plurality of cells includes a first subset of cells and a second subset of cells;
the BFR SR configuration is configured for the first subset of cells to report a beam failure for the first subset of cells, the first subset of cells including the PCell; and
another BFR SR configuration is configured for the second subset of cells to report a beam failure for the second subset of cells.
12. An electronic device for beam failure recovery (BFR), comprising processing circuitry configured to:
when beam failure is determined to occur on a secondary cell (SCell) in a plurality of cells configured for the electronic device,
send a BFR scheduling request (SR) to a network using a Physical Uplink Control Channel (PUCCH) configured for a primary cell (PCell) in the plurality of cells, the BFR SR indicating the beam failure and requesting resources to report the beam failure;
receive priority scheduling for the resources from the network using a channel configured for the PCell, the resources including aperiodic channel-state information (A-CSI) that indicates a cell index of the SCell and a new beam index for a new candidate beam for the SCell;
send a BFR request (BFRQ) using the resources by sending the A-CSI on a PUCCH configured for the PCell, the BFRQ indicating the cell index of the SCell and the new beam index of the new candidate beam for the SCell; and
receiving a BFR response (BFRR) from the network.
13. The electronic device according to claim 12 , wherein
the plurality of cells further includes another SCell; and
the processing circuitry is configured to:
when beam failure is determined to occur on the other SCell,
send another BFR SR to the network using the PUCCH configured for the PCell;
receive priority scheduling for a BFRQ Medium Access Control (MAC) control element (CE) that indicates a cell index of the other SCell and another new beam index for a new candidate beam for the other SCell;
send another BFRQ by sending the BFRQ MAC CE using a PUSCH configured for the PCell, the other BFRQ indicating the cell index of the other SCell and the other new beam index of the new candidate beam for the other SCell; and
receive another BFRR from the network.
14. The electronic device according to claim 12 , wherein
the processing circuitry is further configured to:
determine that beam failure occurs on the PCell when at least one of one or more serving control channels fails, the PCell being configured with the one or more serving control channels to communicate with the network; and
when the beam failure is determined to occur on the PCell,
send a BFR SR to the network using the PUCCH configured for the PCell, the BFR SR indicating the beam failure of the PCell and requesting other resources to report the beam failure of the PCell;
receive priority scheduling for the other resources from the network using the channel configured for the PCell, the other resources including a BFRQ Medium Access Control (MAC) control element (CE) that indicates a cell index of the PCell and a new beam index for a new candidate beam for the PCell;
send a BFRQ using the other resources to the network by sending the BFRQ MAC CE using a PUSCH configured for the PCell, the BFRQ indicating the cell index of the PCell and the new beam index of the new candidate beam for the PCell; and
receive a new beam update from the network.
15. The electronic device according to claim 12 , wherein
the BFR SR has a BFR SR configuration including a period and an offset.
16. The electronic device according to claim 15 , wherein
the BFR SR configuration is associated with a PUCCH format 0 that includes multiple cyclic shifts, one or more of the multiple cyclic shifts being configured for at least one of: 1) the BFR SR and 2) the BFR SR and at least one of hybrid automatic repeat requests (HARQs).
17. The electronic device according to claim 15 , wherein sending the BFR SR further comprises:
when the BFR SR is scheduled at a same time with a SR, sending the BFR SR prior to sending the SR or sending the BFR SR and the SR simultaneously.
18. The electronic device according to claim 15 , wherein
the plurality of cells includes a first subset of cells and a second subset of cells;
the BFR SR configuration is configured for the first subset of cells to report a beam failure for the first subset of cells, the first subset of cells including the SCell; and
another BFR SR configuration is configured for the second subset of cells to report a beam failure for the second subset of cells.