UPLINK BEAM MANAGEMENT

• US 20200136708A1
• Filed: 02/02/2018
• Published: 04/30/2020
• Est. Priority Date: 02/03/2017
• Status: Abandoned Application

• Current Assignee: IDAC Holdings, Inc. (InterDigital, Inc.)
• Original Assignee: IDAC Holdings, Inc. (InterDigital, Inc.)
• Inventors: Pan, Kyle Jung-Lin, Xi, Fengjun, Ye, Chunxuan
• Application Number:
  US16/482,307
• Publication Number:
  US 20200136708A1
• Time in Patent Office: Days
• CPC Class Codes: G03F 7/0002 Lithographic processes using patterning methods other than those involving the exposure to radiation, e.g. by stamping
• CPC Class Codes: H01L 21/2254 from or through or into an applied layer, e.g. photoresist, nitrides
• CPC Class Codes: H01L 21/28238 with sacrificial oxide
• CPC Class Codes: H01L 21/30617 Anisotropic liquid etching
• CPC Class Codes: H01L 21/76224 using trench refilling with dielectric materials trench filling with polycristalline silicon H01L21/763; together with vertical isolation, e.g. trench refilling in a SOI substrate H01L21/76264
• CPC Class Codes: H04B 7/0408 using two or more beams, i.e. beam diversity
• CPC Class Codes: H04B 7/0617 for beam forming
• CPC Class Codes: H04B 7/0695 using beam selection
• CPC Class Codes: H04B 7/06966 using beam correspondence; using channel reciprocity, e.g. downlink beam training based on uplink sounding reference signal [SRS]
• CPC Class Codes: H04L 25/0226 sounding signals per se
• CPC Class Codes: H04L 5/0051 of dedicated pilots, i.e. pilots destined for a single user or terminal
• CPC Class Codes: H04W 24/10 Scheduling measurement reports ; Arrangements for measurement reports
• CPC Class Codes: H04W 74/0833 Random access procedures, e.g. with 4-step access

Abstract

Systems, methods and instrumentalities are disclosed for uplink beam management. A wireless transmit/receive unit (WTRU) may send a beam correspondence indication to a network device. The beam correspondence indication may indicate a beam correspondence associated with one or more receive beams and one or more transmit beams of the WTRU. The WTRU may determine an uplink time synchronization status associated with the WTRU. The uplink time synchronization status may indicate whether the WTRU is uplink time synchronized. The WTRU may receive, from the network device, a reference signal type in accordance with the determined uplink time synchronization status. The WTRU may receive, from the network device, a beam management indication in response to the beam correspondence indication. The WTRU may perform an uplink beam management based on the received beam management indication.

Claims

1-15. -15. (canceled)

16. A wireless transmit/receive unit (WTRU) comprising:

a memory; and

a processor configured to;

send, to a network device, a first beam correspondence indication that indicates a beam correspondence associated with one or more receive beams and one or more transmit beams of the WTRU;

determine an uplink time synchronization status associated with the WTRU;

send, to the network device, the determined uplink time synchronization status;

receive, from the network device, a reference signal type in accordance with the determined uplink time synchronization status;

receive, from the network device, a first beam management indication in response to the first beam correspondence indication;

perform an uplink beam management based on the received first beam management indication, wherein the uplink beam management comprises being configured to send reference signals having the reference signal type from a subset of WTRU transmit beams based on the beam correspondence;

determine a loss of the beam correspondence;

send, to the network device, a second beam correspondence indication that indicates the loss of the beam correspondence; and

adjust the uplink beam management based on the determined loss of the beam correspondence.

17. The WTRU of claim 16, wherein the uplink beam management comprises a reduced set of beam measurements when compared to an uplink beam management with no beam correspondence.

18. The WTRU of claim 16, wherein the uplink beam management comprises the processor being configured to:

skip one or more beam measurements based on the beam correspondence; and

use one or more downlink measurements for the one or more skipped beam measurements.

19. The WTRU of claim 16, wherein the beam correspondence indicates that the processor is configured to one or more of:

determine a transmit beam based on a downlink measurement on one or more receive beams of the WTRU;

or

determine a receive beam based on an uplink measurement on one or more transmit beams.

20. The WTRU of claim 16, wherein the uplink time synchronization status indicates whether the WTRU is uplink time synchronized.

21. The WTRU of claim 20, wherein the received reference signal type is a new radio (NR) sounding reference signal (SRS) when the WTRU is uplink time synchronized, and wherein the received reference signal type is a NR physical random access channel (PRACH) preamble when the WTRU is not uplink time synchronized.

22. The WTRU of claim 16, wherein the network device is a transmission/reception point (TRP).

23. The WTRU of claim 16, wherein the processor is further configured to receive, from the network device, a second beam management indication, and wherein the beam management is adjusted based on the second beam management indication.

24. A method comprising:

sending, from a wireless transmit/receive unit (WTRU) to a network device, a first beam correspondence indication that indicates a beam correspondence associated with one or more receive beams and one or more transmit beams of the WTRU;

determining an uplink time synchronization status associated with the WTRU;

sending, to the network device, the determined uplink time synchronization status;

receiving, from the network device, a reference signal type in accordance with the determined uplink time synchronization status;

receiving, from the network device, a first beam management indication in response to the first beam correspondence indication;

performing an uplink beam management based on the received first beam management indication, wherein the uplink beam management comprises sending reference signals having the reference signal type from a subset of WTRU transmit beams based on the beam correspondence;

determining a loss of the beam correspondence;

sending, to the network device, a second beam correspondence indication that indicates the loss of the beam correspondence; and

adjusting the uplink beam management based on the determined loss of the beam correspondence.

25. The method of claim 24, wherein the uplink beam management comprises a reduced set of measurements when compared to an uplink beam management with no beam correspondence.

26. The method of claim 24, wherein the uplink beam management comprises:

skipping one or more beam measurements based on the beam correspondence; and

using one or more downlink measurements for the one or more skipped beam measurements.

27. The method of claim 24, wherein the beam correspondence indicates one or more of:

determining a transmit beam based on a downlink measurement on one or more receive beams of the WTRU;

or

determining a receive beam based on an uplink measurement on one or more transmit beams.

28. The method of claim 24, wherein the uplink time synchronizations status indicates whether the WTRU is uplink time synchronized.

29. The method of claim 28, wherein the received reference signal type is a new radio (NR) sounding reference signal (SRS) when the WTRU is uplink time synchronized, and wherein the received reference signal type is a NR physical random access channel (PRACH) preamble when the WTRU is not uplink time synchronized.

30. The method of claim 24, further comprising receiving, from the network device, a second beam management indication, and wherein the beam management is adjusted based on the second beam management indication.