Methods and systems for beam recovery and management

Patent metadata

Field	Value
Publication number	US-2022322480-A1
Application number	US-202217848102-A
Country	US
Kind code	A1
Filing date	Jun 23, 2022
Priority date	Aug 9, 2017
Publication date	Oct 6, 2022
Grant date	—

Abstract

A system and methods for beam failure recovery and management for multi-carrier communications with beamforming are disclosed herein. A wireless transmit/receive unit (WTRU) may monitor for and detect a beam failure of a beam associated with a secondary cell (Scell). The WTRU may select an Scell candidate beam. The WTRU may transmit using a selected uplink (UL) resource in a primary cell (SpCell) a medium access control (MAC) control element (CE) including an indication of Scell beam failure and identifying the selected candidate beam. The WTRU may receive an Scell beam failure indication response on the SpCell indicating an SCell index and a downlink (DL) quasi co-location (QCL) reference associated with the Scell. The WTRU may verify that the DL QCL reference matches with the candidate beam. The WTRU may perform random access on the SCell using the selected QCL reference and the selected candidate beam.

First claim

What is claimed is:

1 . A wireless transmit/receive unit (WTRU) comprising a processor and memory, the processor and memory configured to:
receive configuration information, wherein the configuration information comprises an indication of one or more reference signals (RSs) for beam management measurements and the configuration information comprises beam recovery configuration information, the beam recovery configuration information indicating one or more candidate beams for beam failure recovery and a respective uplink resource for each of the one or more candidate beams; determine that beam failure has occurred based on the beam management measurements performed on the one or more reference signals; select a candidate beam of the one or more candidate beams for indicating the beam failure; and transmit an uplink transmission on the respective uplink resource associated with the selected candidate beam indicated by the beam recovery configuration information.

2 . The WTRU of claim 1 , wherein the uplink resource associated with the selected candidate beam comprises an associated dedicated preamble and an associated time and frequency resource.

3 . The WTRU of claim 2 , wherein the processor and memory being configured to transmit the uplink transmission on the uplink resource associated with the selected candidate beam comprises the processor and memory being configured to transmit a dedicated preamble associated with the selected candidate beam using a time and frequency resource associated with the selected candidate beam.

4 . The WTRU of claim 1 , wherein the one or more RSs comprise one or more of a synchronization signal block or a channel state information reference signal (CSI-RS).

5 . The WTRU of claim 1 , wherein the one or more RSs for beam management are associated with a beam used for transmitting one or more physical downlink control channel (PDCCH) transmissions to the WTRU.

6 . The WTRU of claim 1 , wherein the processor and memory are further configured to:
receive a first search space for monitoring for physical downlink control channel (PDCCH) transmissions associated with a first transmission beam, the first transmission beam being associated with a first reference signal configuration; and receive a second search space for monitoring for PDCCH transmissions associated with a second transmission beam, the second transmission beam being associated with a second reference signal configuration.

7 . The WTRU of claim 1 , wherein the one or more RSs for beam management measurements are associated with a beam used for PDCCH reception.

8 . The WTRU of claim 1 , wherein the beam recovery configuration information indicates a search space to be monitored by the WTRU based on the WTRU transmitting the uplink transmission.

9 . The WTRU of claim 8 , wherein the processor and memory are configured to receive a random access response via the search space based on the WTRU transmitting the uplink transmission.

10 . The WTRU of claim 1 , wherein the beam recovery configuration information indicates an associated synchronization signal block (SSB) or associated channel state information reference signal (CSI-RS) for each of the one or more candidate beams.

11 . A method implemented by a wireless transmit/receive unit (WTRU), the method comprising:
receiving configuration information, wherein the configuration information comprises an indication of one or more reference signals (RSs) for beam management measurements, and the configuration information comprises beam recovery configuration information, the beam recovery configuration information indicating one or more candidate beams for beam failure recovery and a respective uplink resource for each of the one or more candidate beams; determining that beam failure has occurred based on the beam management measurements performed on the one or more reference signals; selecting a candidate beam of the one or more candidate beams for indicating the beam failure recovery; and transmitting an uplink transmission on the respective uplink resource associated with the selected candidate beam indicated by the beam recovery configuration information.

12 . The method of claim 11 , wherein the uplink resource associated with the selected candidate beams comprises an associated dedicated preamble and an associated time and frequency resource.

13 . The method of claim 12 , wherein the processor and memory being configured to transmit the uplink transmission on the uplink resource associated with the selected candidate beam comprises the processor and memory being configured to transmit a dedicated preamble associated with the selected candidate beam using a time and frequency resource associated with the selected candidate beam.

14 . The method of claim 11 , wherein the one or more RSs comprise one or more of a synchronization signal block or a channel state information reference signal (CSI-RS).

15 . The method of claim 11 , wherein the one or more RSs for beam management are associated with a beam used for transmitting one or more physical downlink control channel (PDCCH) transmissions to the WTRU.

16 . The method of claim 11 , wherein the processor and memory are further configured to:
receive a first search space for monitoring for physical downlink control channel (PDCCH) transmissions associated with a first transmission beam, the first transmission beam being associated with a first reference signal configuration; and receive a second search space for monitoring for PDCCH transmissions associated with a second transmission beam, the second transmission beam being associated with a second reference signal configuration.

17 . The method of claim 11 , wherein the one or more RSs for beam management measurements are associated with a beam used for PDCCH reception.

18 . The method of claim 11 , wherein the beam recovery configuration information indicates a search space to be monitored by the WTRU based on the WTRU transmitting the uplink transmission.

19 . The method of claim 18 , wherein the processor and memory are configured to receive a random-access response via the search space based on the WTRU transmitting the uplink transmission.

20 . The method of claim 11 , wherein the beam recovery configuration information indicates an associated synchronization signal block (SSB) or an associated channel state information reference signal (CSI-RS) for each of the one or more candidate beams.

Assignees

• Idac Holdings Inc

Inventors

• Deenoo Yugeswar
• Deng Tao
• Freda Martino M
• Pelletier Ghyslain
• Alfarhan Faris

Classifications

• H04W72/21

  in the uplink direction of a wireless link, i.e. towards the network · CPC title

• H04W72/23

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

• H04W76/16

  Involving different core network technologies, e.g. a packet-switched [PS] bearer in combination with a circuit-switched [CS] bearer · CPC title

• H04W88/02

  Terminal devices · CPC title

• H04W76/19 Primary

  Connection re-establishment · CPC title