Beam failure recovery assistance in upper band millimeter wave wireless communications

Patent metadata

Field	Value
Publication number	US-11831383-B2
Application number	US-202117156789-A
Country	US
Kind code	B2
Filing date	Jan 25, 2021
Priority date	Jan 27, 2020
Publication date	Nov 28, 2023
Grant date	Nov 28, 2023

Abstract

Methods, systems, and devices for wireless communications are described in which a first wireless device and second wireless device may establish communications using a first beam and a second beam. The first wireless device may perform separate radio link monitoring (RLM) procedures to monitor beam quality for each of a transmit beam and receive beam that are used for communications with a second wireless device. The separate RLM procedures may be used at the first wireless device to determine that one of the transmit or receive beams is experiencing a quality degradation or a radio link failure (RLF), and an RLF indication may be provided to the second wireless device.

First claim

What is claimed is:

1. A method for wireless communications at a first wireless device, comprising:
establishing an uplink connection with a second wireless device using a first beam and a downlink connection with the second wireless device using a second beam that is different from the first beam;
initiating a first radio link monitoring process for the first beam on the uplink connection, wherein the first radio link monitoring process is associated with a first set of one or more radio link monitoring parameters;
initiating, based at least in part on initiating the first radio link monitoring process, a second radio link monitoring process for the second beam on the downlink connection, wherein the second radio link monitoring process is associated with a second set of one or more radio link monitoring parameters different from the first set of one or more radio link monitoring parameters;
selecting one or more candidate beams associated with a first beam characteristic that is a same as a second beam characteristic associated with the second beam; and
transmitting, to the second wireless device based at least in part on a radio link failure, a radio link failure indication comprising an indication of the one or more candidate beams, wherein the radio link failure is based at least in part on the second radio link monitoring process.

2. The method of claim 1 , wherein the first radio link monitoring process is independent of the second radio link monitoring process.

3. The method of claim 1 , wherein one or more of the first radio link monitoring process and the second radio link monitoring process comprise:
measuring an associated metric of the first beam or the second beam for one or more reference signals associated with the first beam or the second beam; and
determining that the associated metric for the one or more reference signals has dropped below a threshold value on at least a configured quantity of occasions.

4. The method of claim 3 , wherein:
the associated metric of the first beam or the second beam includes at least one of a reference signal received power (RSRP), a reference signal received quality (RSRQ), a signal-to-noise ratio (SNR), a signal-to-interference and noise ratio (SINR), a reference signal strength indicator (RSSI), or any combinations thereof, for the one or more reference signals associated with the first beam or the second beam.

5. The method of claim 3 , wherein one or more of the threshold value of the associated metric and the configured quantity of occasions, are different for the first beam and the second beam.

6. The method of claim 1 , wherein the radio link failure indication for the second beam is reported as a downlink control channel failure and is transmitted to the second wireless device using the first beam.

7. The method of claim 1 , wherein the radio link failure indication provides the one or more candidate beams for a beam training procedure.

8. The method of claim 7 , further comprising:
receiving, from the second wireless device responsive to the radio link failure indication, a beam training indication that provides a resource and beam information for the beam training procedure; and
initiating the beam training procedure responsive to the beam training indication.

9. The method of claim 8 , further comprising:
measuring one or more reference signals from one or more training beams received from the second wireless device; and
transmitting a measurement report to the second wireless device based at least in part on the measuring.

10. The method of claim 1 , wherein the transmitting the radio link failure indication comprises:
determining that a triggering event has occurred based on one or more counters associated with one or more beam quality thresholds; and
transmitting the radio link failure indication responsive to an occurrence of the triggering event.

11. The method of claim 1 , wherein the transmitting the radio link failure indication comprises:
reporting an indication of whether a metric associated with the second beam has dropped below a threshold value for use in a beam recovery procedure based on one or more indications that the metric associated with the second beam has dropped below the threshold value.

12. The method of claim 1 , wherein one or more of the first beam and the second beam use a millimeter wave frequency band that includes frequencies that are greater than 24.25 GHz.

13. The method of claim 1 , wherein the first wireless device is one of a user equipment (UE), a base station, a customer premises equipment (CPE), a relay device, a router, a repeater, or an integrated access and backhaul (IAB) node, and the second wireless device is one of a UE, a base station, a CPE, a relay device, a router, a repeater, or an IAB node.

14. A method for wireless communications at a second wireless device, comprising:
establishing an uplink connection with a first wireless device using a first beam and a downlink connection with the first wireless device using a second beam that is different from the first beam;
transmitting signaling to the first wireless device that indicates a first set of one or more radio link monitoring parameters for a first radio link monitoring process associated with the first beam and indicates a second set of one or more radio link monitoring parameters for a second radio link monitoring process associated with the second beam, wherein the first set of one or more radio link monitoring parameters for the first radio link monitoring process is different from the second set of one or more radio link monitoring parameters for the second radio link monitoring process;
receiving a radio link failure indication from the first wireless device indicating that the second beam has a radio link failure, wherein the radio link failure indication comprises an indication of one or more candidate beams associated with a first beam characteristic that is a same as a second beam characteristic associated with the second beam; and
initiating a beam recovery procedure with the first wireless device responsive to receiving the radio link failure indication.

15. The method of claim 14 , wherein the first radio link monitoring process is independent of the second radio link monitoring process.

16. The method of claim 14 , wherein the first set of one or more radio link monitoring parameters or the second set of one or more radio link monitoring parameters, or both include one or more threshold values for a reference signal received power associated with one or more of the first beam or the second beam, a quantity of occasions of reference signal received power being below the one or more threshold values, or any combinations thereof.

17. The method of claim 16 , wherein one or more of the one or more threshold values and the quantity of occasions are different for the first beam and the second beam.

18. The method of claim 14 , wherein the radio link failure indication for the second beam is received from the first wireless device via the uplink connection and indicates a downlink control channel failure.

19. The method of claim 14 , wherein the radio link failure indication provides the one or more candidate beams for a beam training procedure.

20. The method of claim 19 , wherein the initiating the beam recovery procedure comprises:
transmitting a beam training indication to the first wireless device that provides a resource and beam information for the beam training procedure; and
initiating the beam training procedure b

Assignees

• Qualcomm Inc

Inventors

• Raghavan Vasanthan
• Luo Tao
• Li Junyi

Classifications

• H04W84/047

  using dedicated repeater stations · CPC title

• H04L5/0048

  Allocation of pilot signals, i.e. of signals known to the receiver (allocation of control signalling H04L5/0053; use of control signalling H04L5/0091) · CPC title

• H04W24/10

  Scheduling measurement reports {; Arrangements for measurement reports} · CPC title

• H04W72/23

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

• H04W76/18

  Management of setup rejection or failure · CPC title