Method and apparatus for control resource monitoring considering beam failure recovery in a wireless communication system

Patent metadata

Field	Value
Publication number	US-10826758-B2
Application number	US-201916275982-A
Country	US
Kind code	B2
Filing date	Feb 14, 2019
Priority date	Feb 14, 2018
Publication date	Nov 3, 2020
Grant date	Nov 3, 2020

Abstract

A method and apparatus are disclosed. The method includes the UE (User Equipment) being configured with a first CORESET (Control Resource Set). The method also includes the UE being configured with a second CORESET. The method further includes the UE transmitting a preamble for beam failure recovery in response to the UE detecting that beam failure occurs. And the method includes the UE monitoring and/or receiving a DCI scrambled by C-RNTI in the second CORESET in the second slot in response to transmitting the preamble for beam failure recovery. Furthermore, the method includes the UE prioritizing to receive and/or demodulate the DCI scrambled by C-RNTI in the second CORESET in the second slot, if the first number plus the third number exceeds the first maximum number or the second number plus the fourth number exceeds the second maximum number in the second slot.

First claim

The invention claimed is:

1. A method of a UE (User Equipment), comprising:
the UE is configured with a first CORESET (Control Resource Set), wherein (i) the first CORESET is not used to monitor and/or receive a DCI (Downlink Control Information) scrambled by C-RNTI (Cell Radio Network Temporary Identifier) in response to transmitting a preamble for beam failure recovery, (ii) the UE is configured to perform a first number of channel estimation attempts and a second number of blind decode attempts for receiving and/or monitoring the PDCCH(s) (Physical Downlink Control Channel) candidates in the first CORESET in a first slot, and (iii) the UE is configured to perform the first number of channel estimation attempts and the second number of blind decode attempts for receiving and/or monitoring the PDCCH(s) candidates in the first CORESET in a second slot;
the UE is configured with a second CORESET, wherein (i) the second CORESET is not used to monitor and/or receive DL (Downlink) transmission if the UE does not transmit a preamble for beam failure recovery, (ii) the second CORESET is used to monitor and/or receive a DCI scrambled by C-RNTI in response to transmitting a preamble for beam failure recovery, and (iii) the UE is configured to perform a third number of channel estimation attempts and a fourth number of blind decode attempts for receiving and/or monitoring the PDCCH(s) candidates in the second CORESET in the second slot;
the UE transmits a preamble for beam failure recovery in response to the UE detecting that beam failure occurs;
the UE monitors and/or receives a DCI scrambled by C-RNTI in the second CORESET in the second slot in response to transmitting the preamble for beam failure recovery; and
the UE prioritizes to receive and/or demodulate the DCI scrambled by C-RNTI in the second CORESET in the second slot, if the first number plus the third number exceeds the first maximum number or the second number plus the fourth number exceeds the second maximum number in the second slot.

2. The method of claim 1 , wherein the first maximum number is maximum number of channel estimation attempts in a slot.

3. The method of claim 1 , wherein the second maximum number is maximum number of blind decode attempts in a slot.

4. The method of claim 1 , wherein the first CORESET is associated with a first search space and the second CORESET is associated with a second search space.

5. The method of claim 4 , wherein the second search space is configured such that PDCCH candidates in the second search space is not deprioritized, when the first number plus the third number exceeds the first maximum number or the second number plus the fourth number exceeds the second maximum number in the second slot.

6. The method of claim 4 , wherein the UE sets or considers the second search space as having the highest priority.

7. The method of claim 4 , wherein the second search space is a common search space.

8. The method of claim 1 , wherein the UE prioritizes to receive and/or demodulate the DCI scrambled by C-RNTI in the second CORESET in the second slot, if the first number plus the third number exceeds the first maximum number or the second number plus the fourth number exceeds the second maximum number in the second slot, wherein the second search space associated with the second CORESET is UE-specific search space.

9. The method of claim 1 , wherein the UE prioritizes to receive and/or demodulate the DCI scrambled by C-RNTI in the second CORESET in the second slot means that the UE does not drop or ignore the PDCCHs candidates in the second CORESET in the second slot.

10. The method of claim 1 , wherein the UE prioritizes to receive and/or demodulate the DCI scrambled by C-RNTI in the second CORESET over receiving and/or demodulating PDCCHs candidates in one or more other CORESETs in the second slot, wherein at least one of the one or more other CORESETs is associated with a common search space or associated with a search space with the lowest search space ID (Identity).

11. A method for a network, comprising:
the network configures a first CORESET (Control Resource Set) to a UE (User Equipment), wherein (i) the first CORESET is not used by the network to transmit a DCI (Downlink Control Information) scrambled by C-RNTI (Cell Radio Network Temporary Identifier) in response to receiving a preamble for beam failure recovery from the UE, (ii) the first CORESET comprises a first number of channel estimation attempts and a second number of blind decode attempts for the UE to receive and/or monitor the PDCCH(s) (Physical Downlink Control Channel) in the first CORESET in a first slot, and (iii) the first CORESET comprises the first number of channel estimation attempts and the second number of blind decode attempts for the UE to receive and/or monitor the PDCCH(s) candidates in the first CORESET in a second slot;
the network receives a preamble for beam failure recovery from the UE; and
the network transmits a DCI scrambled by C-RNTI in a second CORESET in the second slot in response to receiving the preamble for beam failure recovery, wherein (i) the second CORESET is configured to the UE and not used by the network to transmit DL (Downlink) transmission if not receiving a preamble for beam failure recovery from the UE, (ii) the second CORESET is used by the network to transmit a DCI scrambled by C-RNTI in response to receiving a preamble for beam failure recovery from the UE, (iii) the second CORESET comprises a third number of channel estimation attempts and a fourth number of blind decode attempts for receiving and/or monitoring the PDCCH(s) candidates in the second CORESET in the second slot, and (iv) the second CORESET is configured as not being deprioritized, when the first number plus the third number exceeds the first maximum number or the second number plus the fourth number exceeds the second maximum number in the second slot.

12. The method of claim 11 , wherein the first maximum number is maximum number of channel estimation attempts in a slot.

13. The method of claim 11 , wherein the second maximum number is maximum number of blind decode attempts in a slot.

14. The method of claim 11 , wherein the first CORESET is associated with a first search space and the second CORESET is associated with a second search space.

15. The method of claim 14 , wherein the second search space is configured such that PDCCH candidates in the second search space is not deprioritized, when the first number plus the third number exceeds the first maximum number or the second number plus the fourth number exceeds the second maximum number in the second slot.

16. The method of claim 14 , wherein the network configures the second search space to have the highest priority.

17. The method of claim 14 , wherein the network configures the second search space to be a common search space.

18. The method of claim 14 , wherein PDCCH candidates in the second CORESET or the second search space are not deprioritized means that PDCCH candidates in the second CORESET or the second search space are not dropped or ignored.

19. The method of claim 14 , wherein the network configures the second search space to be a UE-specific search space.

20. The method of claim 14 , wherein the network configures the second search space to include the lowest search space ID (Identity).

Assignees

• Asustek Comp Inc

Inventors

• Huang Chun-Wei
• Liou Jia-Hong

Classifications

• H04W72/56

  based on priority criteria · CPC title

• H04W72/23

  in the downlink direction of a wireless link, i.e. towards a terminal · CPC title

• H04W76/19 Primary

  Connection re-establishment · 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

• H04W24/08

  Testing, {supervising or monitoring} using real traffic · CPC title