User equipment (UE) and methods for vehicle-to-vehicle (V2V) sidelink communication in accordance with a short transmission time interval (TTI)

Patent metadata

Field	Value
Publication number	US-11452115-B2
Application number	US-201816496321-A
Country	US
Kind code	B2
Filing date	Mar 21, 2018
Priority date	Mar 23, 2017
Publication date	Sep 20, 2022
Grant date	Sep 20, 2022

Abstract

Embodiments of a User Equipment (UE) and methods for communication are generally described herein. The UE may select, from a plurality of short transmission time intervals (TTIs), a short TTI for a vehicle-to-vehicle (V2V) sidelink transmission by the UE. The short TTIs may occur within a legacy TTI. The short TTIs may be allocated for V2V sidelink transmissions by non-legacy UEs. The legacy TTI may be allocated for V2V sidelink transmissions by legacy UEs. The UE may transmit, in accordance with the legacy TTI, a legacy physical sidelink control channel (PSCCH) to indicate, to legacy UEs, the V2V sidelink transmission by the UE. The UE may transmit, in accordance with the selected short TTI, a short PSCCH (sPSCCH) to indicate, to non-legacy UEs, the V2V sidelink transmission by the UE.

First claim

What is claimed is:

1. A User Equipment (UE), comprising:
memory; and
processing circuitry, configured to:
select, from a plurality of short transmission time intervals (TTIs), a short TTI for a vehicle-to-vehicle (V2V) sidelink transmission by the UE, wherein the short TTIs occur within a legacy TTI, and wherein the short TTIs are allocated for V2V sidelink transmissions by non-legacy UEs and the legacy TTI is allocated for V2V sidelink transmissions by legacy UEs;
encode, for transmission in accordance with the legacy TTI, a legacy physical sidelink control channel (PSCCH) to indicate, to legacy UEs, the V2V sidelink transmission by the UE; and
encode, for transmission in accordance with the selected short TTI, a short PSCCH (sPSCCH) to indicate, to non-legacy UEs, the V2V sidelink transmission by the UE, and

wherein the memory is configured to store information that identifies the selected short TTI.

2. The UE according to claim 1 , the processing circuitry further configured to:
encode, for the V2V sidelink transmission by the UE, a short physical sidelink shared channel (sPSSCH) based on a block of data bits,
wherein the sPSSCH is encoded for transmission in accordance with the selected short TTI,
wherein the sPSSCH and the sPSCCH are encoded for transmission in separate frequency resources in accordance with a frequency division multiplexing (FDM) technique.

3. The UE according to claim I, the processing circuitry further configured to:
encode, for the V2V sidelink transmission by the UE, a short physical sidelink shared channel (sPSSCH) based on a block of data bits,
wherein the sPSSCH is encoded for transmission, in accordance with a time division multiplexing (TDM) technique, in a short TTI that occurs after the selected short TTI.

4. The UE according to claim 1 , the processing circuitry further configured to:
encode the legacy PSCCH for transmission in first frequency resources allocated for V2V sidelink transmissions by legacy UEs; and
encode the sPSCCH for transmission in second frequency resources allocated for V2V sidelink transmissions by non-legacy UEs.

5. The UE according to claim 4 , the processing circuitry further configured to:
determine one or more sensing or signal quality measurements for the plurality of short TTIs based on one or more channel sense operations prior to the legacy TTI; and
select the short for the V2V sidelink transmission by the UE based at least partly on the sensing or signal quality measurements.

6. The UE according to claim 1 ,
wherein the legacy TTI spans one millisecond (msec), and wherein the plurality of short TTIs includes four short TTIs.

7. The UE according to claim 1 ,
wherein the selected short TTI spans a plurality of symbol periods, wherein at least one of the symbol periods is based on demodulation reference signals (DMRS), and wherein at least one of the symbol periods is based on data bits.

8. The UE according to claim 1 , the processing circuitry further configured to:
encode, for transmission in a first chronological symbol period of the legacy TTI, an automatic gain control (AGC) element to enable AGC at legacy UEs in a shared AGC symbol.

9. The UE according to claim 8 , the processing circuitry further configured to:
encode the AGC element for transmission in the first chronological symbol period of the legacy TTI independent of a position of the selected TTI within the legacy TTI.

10. The UE according to claim 1 ,
wherein the sPSCCH includes a sidelink control information (SCI) that indicates first information related to the V2V sidelink transmission by the UE, and wherein the legacy PSCCH includes a sidelink control information (SCI) format-1 (SCI-F1 ) indicates second information related to the V2V sidelink transmission by the UE.

11. The UE according to claim 10 , the processing circuitry further configured to:
set a duration of a resource selection window according to a latency criteria, wherein the latency criteria is less than or equal to 20 milliseconds.

12. The UE according to claim 1 ,
wherein the UE further includes a transceiver to transmit the legacy PSCCH and the sPSCCH.

13. The UE according to claim 1 ,
wherein the processing circuitry includes a baseband processor to select the short TTI.

14. A non-transitory computer-readable storage medium that stores instructions for execution by one or more processors to perform operations for communication by a User Equipment (UE), the operations to configure the one or more processors to:
select, from candidate resource pools, a resource pool for a vehicle-to-vehicle (V2V) sidelink transmissions by the UE, wherein sub-frames of different candidate resource pools are non-overlapping, and wherein the candidate resource pools are allocated for V2V transmissions of different latencies per candidate resource pool;
during a sensing window before the selected resource pool, attempt to detect V2V sidelink transmissions by other UEs; and
determine, based on sidelink control information (SCI) included in V2V sidelink transmissions detected in the sensing window, one or more candidate sub-frames of a resource selection window available for the V2V sidelink transmission by the UE, wherein the resource selection window is subsequent to the sensing window.

15. The non-transitory computer-readable storage medium according to claim 14 , the operations to further configure the one or more processors to:
select, from the candidate sub-frames, one or more sub-frames for the V2V sidelink transmission by the UE in the resource selection window; and
encode, for transmission in the selected sub-frames, a physical sidelink shared channel (PSSCH) based on a block of data bits.

16. The non-transitory computer-readable storage medium according to claim 15 , the operations to further configure the one or more processors to:
select the one or more sub-frames for V2V sidelink transmissions by the UE in multiple resource selection windows that are shifted in time.

17. The non-transitory computer-readable storage medium according to claim 15 , the operations to further configure the one or more processors to:
select the one or more sub-frames to include the candidate sub-frame that is earliest in the resource selection window.

18. The non-transitory computer-readable; storage medium according to claim 14 ,
wherein the candidate resource pools are configured for sensing windows of different durations, and wherein the durations are based at least partly on reservation periods of the candidate resource pools.

19. The non-transitory computer-readable storage medium according to claim 14 , the operations to further configure the one or more processors to:
determine one or more signal quality or sensing measurements during the sensing window; and
determine the candidate sub-frames based at least partly on the signal quality or sensing measurements.

20. The non-transitory computer-readable storage medium according to claim 19 ,
wherein the resource pool includes multiple sub-channels per sub-frame, and wherein the signal quality or sensing measurements include a channel busy ratio (CBR) based at least partly , on a ratio, for the sub-channels during a window of sub-frames, of a total number of sub-channels for which a signal quality measurement is above a threshold and a total number of sub-channels.

21. The non-transitory computer-readable storage medium according to claim 14 , the operations to further configure the one or more processors to:
select the

Assignees

• Apple Inc

Inventors

• Khoryaev Alexey
• Shilov Mikhail
• Han Seunghee
• Panteleev Sergey
• Sosnin Sergey
• Dyakov Pavel

Classifications

• H04W76/14

  Direct-mode setup · CPC title

• H04W72/12 Primary

  Wireless traffic scheduling · CPC title

• H04W72/02 Primary

  Selection of wireless resources by user or terminal · CPC title

• H04L5/0051

  of dedicated pilots, i.e. pilots destined for a single user or terminal · CPC title

• H04W4/44

  for communication between vehicles and infrastructures, e.g. vehicle-to-cloud [V2C] or vehicle-to-home [V2H] · CPC title