US-12628154-B2 - Sidelink resource allocation in unlicensed spectrum

Abstract

Certain aspects of the present disclosure provide techniques for communicating using sidelink resources allocated in an unlicensed spectrum. A method that may be performed by a first UE includes establishing a connection with a second UE for sidelink communication in an unlicensed spectrum and communicating with the second UE via the connection using one or more sidelink sub-channels in the unlicensed spectrum according to a mapping between sidelink sub-channels and resource block (RB) sets of the unlicensed spectrum, wherein the unlicensed spectrum comprises a plurality of RB sets and one or more guard bands disposed between RB sets in the plurality RB sets.

Inventors

• Jing Sun
• Ozcan Ozturk
• Juan Montojo
• Tao Luo
• Xiaoxia Zhang
• Peter Gaal
• Changlong Xu

Assignees

• QUALCOMM INCORPORATED

Dates

Publication Date

20260512

Application Date

20201009

Claims (20)

1. 1 . A first user equipment (UE), comprising: one or more processors configured to execute instructions stored on at least one memory to cause the first UE to: receive an indication of a plurality of resource block (RB) sets in an unlicensed spectrum, wherein one or more guard bands are disposed between RB sets in the plurality of RB sets; and communicate with a second UE using one or more sidelink sub-channels in the unlicensed spectrum according to a mapping between the one or more sidelink sub-channels and the plurality of RB sets, wherein the mapping comprises the one or more sidelink sub-channels mapped continuously across the RB sets of the plurality of RB sets and the one or more guard bands in the unlicensed spectrum.
2. 2 . The first UE of claim 1 , wherein the mapping further comprises multiple sidelink sub-channels being mapped to at least one RB set of the plurality of RB sets.
3. 3 . The first UE of claim 1 , wherein, in order to communicate with the second UE using the one or more sidelink sub-channels, the one or more processors are configured to cause the first UE to: perform a listen before talk (LBT) procedure across a first RB set and a second RB set to determine whether resources in the first RB set and resources in the second RB set are available for use; and communicate with the second UE using the first RB set and the second RB set when, based on the LBT procedure, the resources in the first RB set are available for use and the resources in the second RB set are available for use.
4. 4 . The first UE of claim 3 , wherein, in order to communicate with the second UE, the one or more processors are configured to cause the first UE to additionally communicate with the second UE using a first guard band disposed between the first RB set and the second RB set.
5. 5 . The first UE of claim 3 , wherein, in order to communicate with the second UE, the one or more processors are configured to cause the first UE to refrain from communicating with the second UE using a first guard band disposed between the first RB set and the second RB set.
6. 6 . The first UE of claim 1 , wherein the mapping between the sidelink sub-channels and RB sets of the unlicensed spectrum comprises the sidelink sub-channels being mapped continuously across the plurality of RB sets and not the one or more guard bands in the unlicensed spectrum.
7. 7 . The first UE of claim 6 , wherein a first sidelink sub-channel of the one or more sidelink sub-channels and a second sidelink sub-channel of the one or more sidelink sub-channels map to a first RB set of the unlicensed spectrum.
8. 8 . The first UE of claim 7 , wherein the second sidelink sub-channel occupies less bandwidth than the first sidelink sub-channel.
9. 9 . The first UE of claim 8 , wherein the second sidelink sub-channel does not include a physical sidelink control channel (PSCCH) based on an amount of resources in the second sidelink sub-channel available for use being below a threshold.
10. 10 . The first UE of claim 7 , wherein an amount of bandwidth occupied by each of the sidelink sub-channels is based on a relative frequency location of the corresponding sidelink sub-channel with respect to the one or more guard bands.
11. 11 . The first UE of claim 7 , wherein: a first portion of the second sidelink sub-channel is included within the first RB set of the unlicensed spectrum; a second portion of the second sidelink sub-channel is included within a second RB set of the unlicensed spectrum; and a guard band of the one or more guard bands is disposed between the first RB set and the second RB set.
12. 12 . The first UE of claim 11 , wherein a bandwidth of the first sidelink sub-channel is equal to a sum of a bandwidth of the first portion of the second sidelink sub-channel and a bandwidth of the second portion of the second sidelink sub-channel.
13. 13 . The first UE of claim 11 , wherein: a physical sidelink control channel (PSCCH) in the second sidelink sub-channel is rate matched around the guard band; and a physical sidelink shared channel (PSSCH) in the second sidelink sub-channel is one of rate matched into the guard band or rate matched around the guard band based on at least one of a capability of the first UE or a capability of the second UE.
14. 14 . The first UE of claim 6 , wherein, in order to communicate with the second UE using the one or more sidelink sub-channels, the one or more processors are configured to cause the first UE to: perform a listen before talk (LBT) procedure across a first RB set and a second RB set to determine whether resources in the first RB set and resources in the second RB set are available for use; and communicate with the second UE using at least one of the one or more sidelink sub-channels spanning the first RB set and the second RB set when, based on the LBT procedure, the resources in the first RB set are available for use and the resources in the second RB set are available for use.
15. 15 . The first UE of claim 14 , wherein, in order to communicate with the second UE using the at least one of the one or more sidelink sub-channels, the one or more processors are further configured to cause the first UE to communicate with the second UE using a guard band disposed between the first RB set and the second RB set based on a capability of at least one of the first UE or the second UE.
16. 16 . The first UE of claim 14 , wherein, in order to communicate with the second UE using the at least one of the sidelink sub-channels, the one or more processors are configured to cause the first UE to refrain from communicating with the second UE using a guard band disposed between the first RB set and the second RB set based on a capability of at least one of the first UE or the second UE.
17. 17 . The first UE of claim 1 , wherein the mapping between the sidelink sub-channels and the RB sets of the unlicensed spectrum comprises each of the sidelink sub-channels being fully confined within a corresponding RB set of the plurality of RB sets such that no sidelink sub-channel spans a guard band disposed between two RB set of the plurality of RB sets.
18. 18 . The first UE of claim 17 , wherein: the one or more sidelink sub-channels comprise a first sidelink sub-channel confined within a first RB set of the unlicensed spectrum and a second sidelink sub-channel confined within a second RB set of the unlicensed spectrum; the first RB set is disposed adjacent to the second RB set; and the first sidelink sub-channel is disposed adjacent to the second sidelink sub-channel but separated from the second sidelink sub-channel by at least a guard band.
19. 19 . The first UE of claim 18 , wherein: the one or more processors are further configured to cause the first UE to communicate an assignment of resources for communicating with the second UE; and the assignment of resources includes resources disposed between the first sidelink sub-channel and the second sidelink sub-channel, including resources in the guard band, and resources in the first sidelink sub-channel and the second sidelink sub-channel.
20. 20 . The first UE of claim 19 , wherein, in order to communicate with the second UE, the one or more processors are configured to cause the first UE to communicate via the resources disposed between the first sidelink sub-channel and the second sidelink sub-channel based on at least one of a capability of the first UE or the second UE.

Description

CROSS-REFERENCE TO RELATED APPLICATION(S) This application is a national stage application under 35 U.S.C. 371 of PCT/CN2020/119928, filed Oct. 9, 2020, which is hereby expressly incorporated by reference herein in its entirety as if fully set forth below and for all applicable purposes. INTRODUCTION Aspects of the present disclosure relate to wireless communications, and more particularly, to techniques for sidelink resource allocation in unlicensed spectrum. Wireless communication systems are widely deployed to provide various telecommunication services such as telephony, video, data, messaging, broadcasts, etc. These wireless communication systems may employ multiple-access technologies capable of supporting communication with multiple users by sharing available system resources (e.g., bandwidth, transmit power, etc.). Examples of such multiple-access systems include 3rd Generation Partnership Project (3GPP) Long Term Evolution (LTE) systems, LTE Advanced (LTE-A) systems, code division multiple access (CDMA) systems, time division multiple access (TDMA) systems, frequency division multiple access (FDMA) systems, orthogonal frequency division multiple access (OFDMA) systems, single-carrier frequency division multiple access (SC-FDMA) systems, and time division synchronous code division multiple access (TD-SCDMA) systems, to name a few. These multiple access technologies have been adopted in various telecommunication standards to provide a common protocol that enables different wireless devices to communicate on a municipal, national, regional, and even global level. New radio (e.g., 5G NR) is an example of an emerging telecommunication standard. NR is a set of enhancements to the LTE mobile standard promulgated by 3GPP. NR is designed to better support mobile broadband Internet access by improving spectral efficiency, lowering costs, improving services, making use of new spectrum, and better integrating with other open standards using OFDMA with a cyclic prefix (CP) on the downlink (DL) and on the uplink (UL). To these ends, NR supports beamforming, multiple-input multiple-output (MIMO) antenna technology, and carrier aggregation. However, as the demand for mobile broadband access continues to increase, there exists a need for further improvements in NR and LTE technology. Preferably, these improvements should be applicable to other multi-access technologies and the telecommunication standards that employ these technologies. SUMMARY The systems, methods, and devices of the disclosure each have several aspects, no single one of which is solely responsible for its desirable attributes. Without limiting the scope of this disclosure as expressed by the claims which follow, some features will now be discussed briefly. After considering this discussion, and particularly after reading the section entitled “Detailed Description” one will understand how the features of this disclosure provide advantages that include improvements to sidelink resource allocation in an unlicensed spectrum. Certain aspects of the subject matter described in this disclosure can be implemented in a method for wireless communication by a user equipment (UE). The method generally includes establishing a connection with a second UE for sidelink communication in an unlicensed spectrum and communicating with the second UE via the connection using one or more sidelink sub-channels in the unlicensed spectrum according to a mapping between sidelink sub-channels and resource block (RB) sets of the unlicensed spectrum, wherein the unlicensed spectrum comprises a plurality of RB sets and one or more guard bands disposed between RB sets in the plurality RB sets. Certain aspects of the subject matter described in this disclosure can be implemented in a first user equipment (UE) for wireless communication. The first UE generally includes means for establishing a connection with a second UE for sidelink communication in an unlicensed spectrum and means for communicating with the second UE via the connection using one or more sidelink sub-channels in the unlicensed spectrum according to a mapping between sidelink sub-channels and resource block (RB) sets of the unlicensed spectrum, wherein the unlicensed spectrum comprises a plurality of RB sets and one or more guard bands disposed between RB sets in the plurality RB sets. Certain aspects of the subject matter described in this disclosure can be implemented in a first user equipment (UE) for wireless communication. The first UE generally includes a memory; and a processor coupled to the memory, the memory and the processor configured to: establish a connection with a second UE for sidelink communication in an unlicensed spectrum and communicate with the second UE via the connection using one or more sidelink sub-channels in the unlicensed spectrum according to a mapping between sidelink sub-channels and resource block (RB) sets of the unlicensed spectrum, wherein the unlicensed spectrum comprises a plu