US-12621805-B2 - Resource configuration and reservation for sidelink communications

US12621805B2US 12621805 B2US12621805 B2US 12621805B2US-12621805-B2

Abstract

Methods, systems, and devices for wireless communications are described. Generally, the described techniques provide for efficiently selecting resources for sidelink communications in a shared spectrum while allowing other user equipment (UEs) a chance to gain access to the shared spectrum. In one aspect, a UE may transmit sidelink data to another UE in accordance with a frequency hopping pattern to randomize interference and improve throughput. According to some aspects, the first UE may transmit the sidelink data on a first set of interleaved frequency resources in a first time interval and a second, different set of interleaved frequency resources in a second time interval. In another aspect, a UE may rely on feedback from other UEs to determine when reserved resources are released, and the UE may use the released resources for sidelink communications.

Inventors

Seyed Ali Akbar FAKOORIAN
Jing Sun
Xiaoxia Zhang

Assignees

QUALCOMM INCORPORATED

Dates

Publication Date: 20260505
Application Date: 20230414

Claims (20)

1 . A method for wireless communication implemented by a first user equipment (UE), comprising: identifying a resource pool configuration indicating resources in a shared radio frequency spectrum band available to the first UE for sidelink communications, the resources comprising a plurality of contiguous time intervals; performing a listen-before-talk procedure to gain access to the shared radio frequency spectrum band for a channel occupancy time to transmit sidelink data to a second UE, the channel occupancy time spanning at least a first time interval and a second time interval of the plurality of contiguous time intervals; identifying a frequency hopping pattern comprising a first set of interleaved frequency resources for transmitting the sidelink data in the first time interval of the plurality of contiguous time intervals and a second set of interleaved frequency resources for transmitting the sidelink data in the second time interval of the plurality of contiguous time intervals; and transmitting, to the second UE, the sidelink data on the first set of interleaved frequency resources in the first time interval and the second set of interleaved frequency resources in the second time interval based at least in part on the frequency hopping pattern.
2 . The method of claim 1 , further comprising: receiving control information indicating at least one set of interleaved frequency resources that is available for each time interval of the plurality of contiguous time intervals, wherein identifying the frequency hopping pattern comprising the first set of interleaved frequency resources in the first time interval and the second set of interleaved frequency resources in the second time interval is based at least in part on receiving the control information.
3 . The method of claim 1 , further comprising: transmitting, in the first time interval, an indication of the first set of interleaved frequency resources used for transmitting the sidelink data in the first time interval; and transmitting, in the second time interval, an indication of the second set of interleaved frequency resources used for transmitting the sidelink data in the second time interval.
4 . The method of claim 1 , further comprising: transmitting, in the first time interval, an indication of the second set of interleaved frequency resources used for transmitting the sidelink data in the second time interval.
5 . A method for wireless communication implemented by a first user equipment (UE), comprising: identifying a resource pool configuration indicating resources in a shared radio frequency spectrum band available to the first UE for sidelink communications, the resources comprising a plurality of contiguous time intervals; identifying a frequency hopping pattern comprising a first set of interleaved frequency resources for transmitting sidelink data in a first time interval of the plurality of contiguous time intervals and a second set of interleaved frequency resources for transmitting the sidelink data in a second time interval of the plurality of contiguous time intervals; transmitting, to a second UE, the sidelink data on the first set of interleaved frequency resources in the first time interval and the second set of interleaved frequency resources in the second time interval based at least in part on the frequency hopping pattern; and transmitting, in the first time interval, the second time interval, or both, an indication of the frequency hopping pattern used by the first UE to transmit the sidelink data on the first set of interleaved frequency resources in the first time interval and on the second set of interleaved frequency resources in the second time interval.
6 . The method of claim 1 , further comprising: transmitting an indication of gaps in the first time interval, the second time interval, or both, allocated for other UEs to perform listen-before-talk procedures to gain access to the shared radio frequency spectrum band.
7 . The method of claim 1 , wherein: respective sets of interleaved frequency resources available to the first UE for sidelink communications in each time interval of the plurality of contiguous time intervals are based at least in part on a subcarrier spacing of a respective time interval, a sidelink identification (ID) of the first UE, a resource pool ID of a respective set of interleaved frequency resources, one or more parameters associated with group hopping of frequency resources, or a combination thereof.
8 . An apparatus for wireless communication at a first user equipment (UE), comprising: one or more processors; and memory coupled with the one or more processors, wherein the memory comprises instructions executable by the one or more processors to cause the apparatus to: receive a resource pool configuration indicating resources in a shared radio frequency spectrum band available to the first UE for sidelink communications, the resources comprising a plurality of contiguous time intervals; perform a listen-before-talk procedure to gain access to the shared radio frequency spectrum band for a channel occupancy time to transmit sidelink data to a second UE, the channel occupancy time spanning at least a first time interval and a second time interval of the plurality of contiguous time intervals; identify a frequency hopping pattern comprising a first set of interleaved frequency resources for transmitting the sidelink data in the first time interval of the plurality of contiguous time intervals and a second set of interleaved frequency resources for transmitting the sidelink data in the second time interval of the plurality of contiguous time intervals; and transmit, to the second UE, the sidelink data on the first set of interleaved frequency resources in the first time interval and the second set of interleaved frequency resources in the second time interval based at least in part on the frequency hopping pattern.
9 . The apparatus of claim 8 , wherein the instructions are further executable by the one or more processors to cause the apparatus to: receive control information indicating at least one set of interleaved frequency resources that is available for each time interval of the plurality of contiguous time intervals, wherein identifying the frequency hopping pattern comprising the first set of interleaved frequency resources in the first time interval and the second set of interleaved frequency resources in the second time interval is based at least in part on receiving the control information.
10 . The apparatus of claim 8 , wherein the instructions are further executable by the one or more processors to cause the apparatus to: transmit, in the first time interval, an indication of the first set of interleaved frequency resources used for transmitting the sidelink data in the first time interval; and transmit, in the second time interval, an indication of the second set of interleaved frequency resources used for transmitting the sidelink data in the second time interval.
11 . The apparatus of claim 8 , wherein the instructions are further executable by the one or more processors to cause the apparatus to: transmit, in the first time interval, an indication of the second set of interleaved frequency resources used for transmitting the sidelink data in the second time interval.
12 . An apparatus for wireless communication at a first user equipment (UE), comprising: one or more processors; and memory coupled with the one or more processors, wherein the memory comprises instructions executable by the one or more processors to cause the apparatus to: receive a resource pool configuration indicating resources in a shared radio frequency spectrum band available to the first UE for sidelink communications, the resources comprising a plurality of contiguous time intervals; identify a frequency hopping pattern comprising a first set of interleaved frequency resources for transmitting sidelink data in a first time interval of the plurality of contiguous time intervals and a second set of interleaved frequency resources for transmitting the sidelink data in a second time interval of the plurality of contiguous time intervals; transmit, to a second UE, the sidelink data on the first set of interleaved frequency resources in the first time interval and the second set of interleaved frequency resources in the second time interval based at least in part on the frequency hopping pattern; and transmit, in the first time interval, the second time interval, or both, an indication of the frequency hopping pattern used by the first UE to transmit the sidelink data on the first set of interleaved frequency resources in the first time interval and on the second set of interleaved frequency resources in the second time interval.
13 . The apparatus of claim 8 , wherein the instructions are further executable by the one or more processors to cause the apparatus to: transmit an indication of gaps in the first time interval, the second time interval, or both, allocated for other UEs to perform listen-before-talk procedures to gain access to the shared radio frequency spectrum band.
14 . The apparatus of claim 8 , wherein respective sets of interleaved frequency resources available to the first UE for sidelink communications in each time interval of the plurality of contiguous time intervals are based at least in part on a subcarrier spacing of a respective the time interval, a sidelink identification (ID) of the first UE, a resource pool ID of a respective set of interleaved frequency resources, one or more parameters associated with group hopping of frequency resources, or a combination thereof.
15 . An apparatus for wireless communication implemented by a first user equipment (UE), comprising: means for identifying a resource pool configuration indicating resources in a shared radio frequency spectrum band available to the first UE for sidelink communications, the resources comprising a plurality of contiguous time intervals; means for performing a listen-before-talk procedure to gain access to the shared radio frequency spectrum band for a channel occupancy time to transmit sidelink data to a second UE, the channel occupancy time spanning at least a first time interval and a second time interval of the plurality of contiguous time intervals; means for identifying a frequency hopping pattern comprising a first set of interleaved frequency resources for transmitting the sidelink data in the first time interval of the plurality of contiguous time intervals and a second set of interleaved frequency resources for transmitting the sidelink data in the second time interval of the plurality of contiguous time intervals; and means for transmitting, to the second UE, the sidelink data on the first set of interleaved frequency resources in the first time interval and the second set of interleaved frequency resources in the second time interval based at least in part on the frequency hopping pattern.
16 . The apparatus of claim 15 , further comprising: means for receiving control information indicating at least one set of interleaved frequency resources that is available for each time interval of the plurality of contiguous time intervals, wherein identifying the frequency hopping pattern comprising the first set of interleaved frequency resources in the first time interval and the second set of interleaved frequency resources in the second time interval is based at least in part on receiving the control information.
17 . The apparatus of claim 15 , further comprising: means for transmitting, in the first time interval, an indication of the first set of interleaved frequency resources used for transmitting the sidelink data in the first time interval; and means for transmitting, in the second time interval, an indication of the second set of interleaved frequency resources used for transmitting the sidelink data in the second time interval.
18 . The apparatus of claim 15 , further comprising: means for transmitting, in the first time interval, an indication of the second set of interleaved frequency resources used for transmitting the sidelink data in the second time interval.
19 . An apparatus for wireless communication implemented by a first user equipment (UE), comprising means for identifying a resource pool configuration indicating resources in a shared radio frequency spectrum band available to the first UE for sidelink communications, the resources comprising a plurality of contiguous time intervals; means for identifying a frequency hopping pattern comprising a first set of interleaved frequency resources for transmitting sidelink data in a first time interval of the plurality of contiguous time intervals and a second set of interleaved frequency resources for transmitting the sidelink data in a second time interval of the plurality of contiguous time intervals; means for transmitting, to a second UE, the sidelink data on the first set of interleaved frequency resources in the first time interval and the second set of interleaved frequency resources in the second time interval based at least in part on the frequency hopping pattern; and means for transmitting, in the first time interval, the second time interval, or both, an indication of the frequency hopping pattern used by the first UE to transmit the sidelink data on the first set of interleaved frequency resources in the first time interval and on the second set of interleaved frequency resources in the second time interval.
20 . The apparatus of claim 15 , further comprising: means for transmitting an indication of gaps in the first time interval, the second time interval, or both, allocated for other UEs to perform listen-before-talk procedures to gain access to the shared radio frequency spectrum band.

Description

CROSS REFERENCE The present application for patent is a divisional of U.S. patent application Ser. No. 17/081,838 by FAKOORIAN et al., entitled “RESOURCE CONFIGURATION AND RESERVATION FOR SIDELINK COMMUNICATIONS,” filed Oct. 27, 2020, which claims the benefit of U.S. Provisional Patent Application No. 62/929,661 by FAKOORIAN et al., entitled “RESOURCE CONFIGURATION AND RESERVATION FOR SIDELINK COMMUNICATIONS,” filed Nov. 1, 2019, each of which is assigned to the assignee hereof, and each of which is expressly incorporated by reference herein. BACKGROUND The following relates generally to wireless communications and more specifically to resource configuration and reservation for sidelink communications. Wireless communications systems are widely deployed to provide various types of communication content such as voice, video, packet data, messaging, broadcast, and so on. These systems may be capable of supporting communication with multiple users by sharing the available system resources (e.g., time, frequency, and power). Examples of such multiple-access systems include fourth generation (4G) systems such as Long-Term Evolution (LTE) systems, LTE-Advanced (LTE-A) systems, or LTE-A Pro systems, and fifth generation (5G) systems which may be referred to as New Radio (NR) systems. These systems may employ technologies such as code division multiple access (CDMA), time division multiple access (TDMA), frequency division multiple access (FDMA), orthogonal frequency division multiple access (OFDMA), or discrete Fourier transform spread orthogonal frequency division multiplexing (DFT-S-OFDM). A wireless multiple-access communications system may include a number of base stations or network access nodes, each simultaneously supporting communication for multiple communication devices, which may be otherwise known as user equipment (UEs). Some wireless communications systems may support sidelink communications between UEs over a shared radio frequency spectrum. In such systems, a UE may contend for access to the shared radio frequency spectrum to transmit sidelink data to another UE, and it may be challenging for the UE to gain access to the shared radio frequency spectrum. Improved techniques for facilitating sidelink communications over a shared radio frequency spectrum may be desirable. SUMMARY The present disclosure relates to methods, systems, devices, and apparatuses that support resource configuration and reservation for sidelink communications. Generally, the described techniques provide for efficiently selecting resources for sidelink communications in a shared spectrum while allowing other UEs a chance to gain access to the shared spectrum. In one aspect, a UE may transmit sidelink data to another UE in accordance with a frequency hopping pattern to randomize interference and improve throughput. For instance, the UE may transmit the sidelink data on a first set of interleaved frequency resources in a first time interval and a second, different set of interleaved frequency resources in a second time interval. In another aspect, a UE may rely on hybrid automatic repeat request (HARQ) feedback from other UEs to determine when reserved resources are released, and the UE may use the released resources for sidelink communications. For instance, when a first UE receives HARQ feedback indicating that a transmission from a second UE was successfully received by a third UE, the first UE may use resources reserved by the second UE (e.g., for a subsequent retransmission) to transmit sidelink data to a fourth UE. A method of wireless communication implemented by a first UE is described. The method may include identifying a resource pool configuration indicating resources in a shared radio frequency spectrum band available to the first UE for sidelink communications, the resources comprising a plurality of contiguous time intervals, identifying a frequency hopping pattern including a first set of interleaved frequency resources for transmitting sidelink data in a first time interval of the set of contiguous time intervals and a second set of interleaved frequency resources for transmitting the sidelink data in a second time interval of the set of contiguous time intervals, and transmitting, to a second UE, the sidelink data on the first set of interleaved frequency resources in the first time interval and the second set of interleaved frequency resources in the second time interval based on the frequency hopping pattern. An apparatus for wireless communication at a first UE is described. The apparatus may include a processor, memory coupled with the processor, and instructions stored in the memory. The instructions may be executable by the processor to cause the apparatus to identify a resource pool configuration indicating resources in a shared radio frequency spectrum band available to the first UE for sidelink communications, the resources comprising a plurality of contiguous time intervals, identify a frequency hopping