Techniques for configuring or transmitting grantless transmissions on beams in uplink subframes

• US 10,667,288 B2
• Filed: 02/19/2018
• Issued: 05/26/2020
• Est. Priority Date: 02/21/2017
• Status: Active Grant

• Current Assignee: Qualcomm, Inc.
• Original Assignee: Qualcomm, Inc.
• Inventors: Chendamarai Kannan, Arumugam, Radulescu, Andrei Dragos, Patel, Chirag Sureshbhai, Kadous, Tamer
• Primary Examiner(s): Banks Harold, Marsha D
• Assistant Examiner(s): Williams, Elton
• Application Number:
  US15/899,257
• Publication Number:
  US 20180242348A1
• Time in Patent Office: 827 Days
• CPC Class Codes: H04L 5/0007 the frequencies being orthogonal, e.g. OFDM(A), DMT
• CPC Class Codes: H04L 5/005 of common pilots, i.e. pilots destined for multiple users or terminals
• CPC Class Codes: H04L 5/0053 Allocation of signaling, i.e. of overhead other than pilot signals
• CPC Class Codes: H04W 72/044 based on the type of the allocated resource
• CPC Class Codes: H04W 72/1268 of uplink data flows
• CPC Class Codes: H04W 72/23 in the downlink direction of a wireless link, i.e. towards a terminal
• CPC Class Codes: H04W 74/0808 using carrier sensing, e.g. carrier sense multiple access [CSMA]

Abstract

A method for wireless communication at a user equipment (UE) includes receiving timing information and a time-frequency resource configuration for an uplink subframe; selecting at least a first set of time-frequency resources of the uplink subframe on which to transmit; and transmitting a grantless transmission on at least the first set of time-frequency resources. The time-frequency resource configuration identifies a correspondence between at least one receive beam in a set of one or more receive beams and at least one set of time-frequency resources in one or more sets of time-frequency resources of the uplink subframe. The first set of time-frequency resources is selected based at least in part on a transmit beam of the UE, a correspondence of the transmit beam to a receive beam in the set of one or more receive beams, and a correspondence of the receive beam to the selected first set of time-frequency resources.

Claims

1. A method for wireless communication at a user equipment (UE), comprising:

receiving timing information for an uplink subframe and a time-frequency resource configuration for the uplink subframe, the timing information indicating when to transmit over the uplink subframe, the time-frequency resource configuration identifying a correspondence between at least one receive beam in a set of one or more receive beams and at least one set of time-frequency resources in one or more sets of time-frequency resources of the uplink subframe;

identifying a transmit beam of the UE to use for transmitting a grantless transmission;

selecting at least a first set of time-frequency resources of the uplink subframe on which to transmit, the first set of time-frequency resources selected based at least in part on the identified transmit beam of the UE using a correspondence of the identified transmit beam of the UE to a receive beam in the set of one or more receive beams, and a correspondence of the receive beam to the selected first set of time-frequency resources; and

transmitting, according to the received timing information for the uplink subframe, the grantless transmission on at least the selected first set of time-frequency resources.

2. The method of claim 1, wherein receiving the timing information for the uplink subframe comprises:

receiving an indication of;

a fixed timing of the uplink subframe, a first timing offset of the uplink subframe relative to a discovery reference signal (DRS) transmission, or a second timing offset of the uplink subframe relative to a trigger transmission that triggers the transmitting of the grantless transmission.

3. The method of claim 2, further comprising:

receiving the trigger transmission in at least one of;

a broadcast transmission or a UE-specific transmission.

4. The method of claim 1, further comprising:

receiving a system information transmission comprising at least one of;

at least a portion of the timing information for the uplink subframe, at least a portion of the time-frequency resource configuration for the uplink subframe, or a combination thereof.

5. The method of claim 1, wherein the time-frequency resource configuration for the uplink subframe further identifies a correspondence between at least one transmission type and the at least one set of time-frequency resources in the one or more sets of time-frequency resources of the uplink subframe.

6. The method of claim 5, wherein the first set of time-frequency resources of the uplink subframe is further selected based at least in part on a first transmission type of the UE, and on a correspondence between the first transmission type and the first set of time-frequency resources of the uplink subframe.

7. The method of claim 5, wherein the at least one transmission type comprises at least one of:

an acknowledgement/non-acknowledgement (ACK/NACK) transmission type, a random access transmission type, a channel quality information (CQI) transmission type, a scheduling request (SR) transmission type, a sounding reference signal (SRS) transmission type, a grantless physical uplink shared channel (PUSCH) transmission type, or a combination thereof.

8. The method of claim 5, wherein the correspondence between the at least one transmission type and the at least one set of time-frequency resources is based at least in part on:

a first pre-allocation of different bandwidths to different transmission types, a second pre-allocation of different code division multiplexing (CDM) codes to different transmission types, a third pre-allocation of different orthogonal cover codes (OCCs) to different transmission types, or a combination thereof.

9. The method of claim 1, wherein the time-frequency resource configuration for the uplink subframe further identifies a correspondence between at least one UE and the at least one set of time-frequency resources in one or more sets of time-frequency resources of the uplink subframe.

10. The method of claim 9, wherein the first set of time-frequency resources of the uplink subframe is further selected based at least in part on the UE, and on a correspondence between the UE and the first set of time-frequency resources of the uplink subframe.

11. The method of claim 1, further comprising:

performing a Listen Before Talk (LBT) procedure prior to the transmitting.

12. The method of claim 11, wherein the LBT procedure is performed at least one of:

for at least one beam direction and prior to all of the one or more sets of time-frequency resources corresponding to the one or more receive beams, for all beam directions and prior to all of the one or more sets of time-frequency resources corresponding to the one or more receive beams, or for at least the transmit beam or the receive beam and in a LBT gap prior to the first set of time-frequency resources.

13. The method of claim 11, further comprising:

selecting a type of the LBT procedure based at least in part on a transmission type.

14. The method of claim 1, further comprising:

determining, based at least in part on a transmission type, whether to perform a LBT procedure prior to the transmitting.

15. The method of claim 1, wherein the time-frequency resource configuration identifies at least one of:

a first timing of a first Listen Before Talk (LBT) gap associated with more than one receive beam, a second timing of a second LBT gap associated with a single receive beam, a transmission start time associated with at least one of the plurality of receive beams, or a combination thereof.

16. The method of claim 1, wherein the timing information for the uplink subframe comprises an indication of a time window in which the uplink subframe is to be transmitted.

17. The method of claim 16, further comprising:

receiving, during the time window, a trigger transmission that triggers the transmitting of the grantless transmission;

wherein the timing information for the uplink subframe is relative to the trigger transmission.

30. The method of claim 2, wherein at least a portion of the timing information for the uplink subframe, at least a portion of the time-frequency resource configuration for the uplink subframe, or a combination thereof, is received via the trigger transmission.

18. An apparatus for wireless communication at a user equipment (UE), comprising:

a processor;

memory in electronic communication with the processor; and

instructions stored in the memory, wherein the instructions are executable by the processor to;

receive timing information for an uplink subframe and a time-frequency resource configuration for the uplink subframe, the timing information indicating when to transmit over the uplink subframe, the time-frequency resource configuration identifying a correspondence between at least one receive beam in a set of one or more receive beams and at least one set of time-frequency resources in one or more sets of time-frequency resources of the uplink subframe;

identify a transmit beam of the UE to use for transmitting a grantless transmission;

select at least a first set of time-frequency resources of the uplink subframe on which to transmit, the first set of time-frequency resources selected based at least in part on the identified transmit beam of the UE using a correspondence of the identified transmit beam of the UE to a receive beam in the set of one or more receive beams, and a correspondence of the receive beam to the selected first set of time-frequency resources; and

transmit, according to the received timing information for the uplink subframe, the grantless transmission on at least the selected first set of time-frequency resources.

19. A method for wireless communication at a base station, comprising:

determining timing information for an uplink subframe and a time-frequency resource configuration for the uplink subframe, the timing information indicating when to transmit over the uplink subframe, the time-frequency resource configuration identifying a correspondence between at least one receive beam in a set of one or more receive beams and at least one set of time-frequency resources in one or more sets of time-frequency resources of the uplink subframe;

transmitting the timing information for the uplink subframe and the time-frequency resource configuration for the uplink subframe, the timing information comprising an indication of a timing offset of the uplink subframe relative to a trigger transmission that triggers transmitting of a grantless transmission by a user equipment (UE) on the at least one receive beam;

transmitting the trigger transmission to trigger transmitting of the grantless transmission by the UE; and

monitoring for transmissions on the at least one receive beam in accordance with the correspondence between the at least one receive beam and the at least one set of time-frequency resources.

20. The method of claim 19, wherein the trigger transmission is transmitted in at least one of a broadcast transmission or a UE-specific transmission.

21. The method of claim 19, further comprising:

transmitting a system information transmission comprising at least one of;

at least a portion of the timing information for the uplink subframe, at least a portion of the time-frequency resource configuration for the uplink subframe, or a combination thereof.

22. The method of claim 19, wherein the time-frequency resource configuration for the uplink subframe further identifies a correspondence between at least one transmission type and the at least one set of time-frequency resources in the one or more sets of time-frequency resources of the uplink subframe.

23. The method of claim 22, wherein the at least one transmission type comprises at least one of:

an acknowledgement/non-acknowledgement (ACK/NACK) transmission type, a random access transmission type, a channel quality information (CQI) transmission type, a scheduling request (SR) transmission type, a sounding reference signal (SRS) transmission type, a grantless physical uplink shared channel (PUSCH) transmission type, or a combination thereof.

24. The method of claim 19, wherein the time-frequency resource configuration for the uplink subframe further identifies a correspondence between at least one UE and the at least one set of time-frequency resources in one or more sets of time-frequency resources of the uplink subframe.

25. The method of claim 19, wherein the time-frequency resource configuration for the uplink subframe further comprises:

a first Listen Before Talk (LBT) gap allocated for at least one beam direction and located prior to all of the one or more sets of time-frequency resources corresponding to the one or more receive beams, a second LBT gap allocated for all beam directions and located prior to all of the one or more sets of time-frequency resources corresponding to the one or more receive beams, or a third LBT gap allocated for a single beam direction and located prior to a set of time-frequency resources corresponding to the single beam direction.

26. The method of claim 19, wherein the time-frequency resource configuration identifies at least one of:

a first timing of a first Listen Before Talk (LBT) gap associated with more than one receive beam, a second timing of a second LBT gap associated with a single receive beam, a transmission start time associated with at least one of the plurality of receive beams, or a combination thereof.

27. The method of claim 19, wherein the timing information for the uplink subframe comprises an indication of a time window in which the uplink subframe is to be transmitted.

28. The method of claim 27, further comprising:

transmitting the trigger transmission during the time window;

wherein the timing information for the uplink subframe is relative to the trigger transmission.

31. The method of claim 19, wherein at least a portion of the timing information for the uplink subframe, at least a portion of the time-frequency resource configuration for the uplink subframe, or a combination thereof, is transmitted via the trigger transmission.

29. An apparatus for wireless communication at a base station, comprising:

a processor;

memory in electronic communication with the processor; and

instructions stored in the memory, wherein the instructions are executable by the processor to;

determine timing information for an uplink subframe and a time-frequency resource configuration for the uplink subframe, the timing information indicating when to transmit over the uplink subframe, the time-frequency resource configuration identifying a correspondence between at least one receive beam in a set of one or more receive beams and at least one set of time-frequency resources in one or more sets of time-frequency resources of the uplink subframe;

transmit the timing information for the uplink subframe and the time-frequency resource configuration for the uplink subframe, the timing information comprising an indication of a timing offset of the uplink subframe relative to a trigger transmission that triggers transmitting of a grantless transmission by a user equipment (UE) on the at least one receive beam;

transmit the trigger transmission to trigger transmitting by the UE; and

monitor for transmissions on the at least one receive beam in accordance with the correspondence between the at least one receive beam and the at least one set of time-frequency resources.

32. The apparatus of claim 29, wherein the instructions are further executable by the processor to:

transmit the trigger transmission in at least one of;

a broadcast transmission or a UE-specific transmission.

33. The apparatus of claim 29, wherein at least a portion of the timing information for the uplink subframe, at least a portion of the time-frequency resource configuration for the uplink subframe, or a combination thereof, is transmitted via the trigger transmission.