SIDELINK SYNCHRONIZATION SIGNAL BLOCK TRANSMISSION IN AN UNLICENSED BAND

Methods, systems, and devices for wireless communications are described. In some examples, a first UE may be configured to transmit multiple sidelink synchronization signal blocks (S-SSBs) within an S-SSB period, the transmissions back-to-back or non-back-to-back. The first UE may determine one or more listen-before-talk occasions associated with the S-SSBs, participate in at least one listen-before-talk procedure during a listen-before-talk occasion, and transmit the multiple S-SSBs to a second UE. In some other examples, the first UE may identify a reference frequency position of a reference S-SSB in a sidelink BWP. The first UE may transmit the reference S-SSB and one or more additional S-SSBs to a second UE, the one or more additional S-SSBs having frequency positions following the reference frequency position.

FIELD OF TECHNOLOGY

The following relates to wireless communications, including sidelink synchronization signal block (S-SSB) transmission in an unlicensed band.

BACKGROUND

In some cases, multiple UEs may perform sidelink communications, which may include sidelink synchronization signal block (S-SSB) transmissions. In some cases, signal strength of the S-SSBs and transmission success rates may be improved.

SUMMARY

The described techniques relate to improved methods, systems, devices, and apparatuses that support sidelink synchronization signal block (S-SSB) transmission in an unlicensed band. For example, the described techniques provide for a first user equipment (UE) (e.g., a transmit UE) to transmit multiple S-SSB repetitions to increase the received signal strength of the transmissions. For example, the UE may transmit multiple S-SSB repetitions in the time domain. The first UE may receive a message from a network entity indicating that the first UE is to transmit multiple S-SSBs, back-to-back or with an offset between each S-SSB, within an S-SSB period. The first UE may determine one or more listen-before-talk (LBT) occasions, where a timing for each LBT occasion may be based on whether the S-SSBs are to be transmitted back-to-back or with the offset. In some examples, the first UE may participate in an LBT procedure during the one or more LBT occasions and transmit the multiple S-SSBs to a second UE (e.g., a receive UE). In some other examples, the first UE may transmit multiple S-SSB repetitions in the frequency domain. For example, the first UE may identify a reference position of a reference S-SSB in a sidelink bandwidth part (BWP) in frequency, and transmit the reference S-SSB and one or more additional S-SSBs to the second UE, where the frequency positions of the one or more additional S-SSBs are different from but based on the reference frequency position (e.g., following the reference frequency position).

A method for wireless communication at a first user equipment (UE) is described. The method may include receiving, from a network entity, a message indicating that the first UE is to transmit multiple S-SSBs within an S-SSB period, the message also indicative of whether the multiple S-SSBs are to be transmitted back-to-back or with an offset between consecutive ones of the multiple S-SSBs, determining one or more LBT occasions in association with the multiple S-SSBs, where a timing of the one or more LBT occasions is based on whether the multiple S-SSBs are to be transmitted back-to-back or with the offset between the consecutive ones of the multiple S-SSBs, participating in at least one LBT procedure during the one or more LBT occasions, and transmitting, to a second UE, the multiple S-SSBs.

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 receive, from a network entity, a message indicating that the first UE is to transmit multiple S-SSBs within an SSB period, the message also indicative of whether the multiple S-SSBs are to be transmitted back-to-back or with an offset between consecutive ones of the multiple S-SSBs, determine one or more LBT occasions in association with the multiple S-SSBs, where a timing of the one or more LBT occasions is based on whether the multiple S-SSBs are to be transmitted back-to-back or with the offset between the consecutive ones of the multiple S-SSBs, participate in at least one LBT procedure during the one or more LBT occasions, and transmit, to a second UE, the multiple S-SSBs.

Another apparatus for wireless communication at a first UE is described. The apparatus may include means for receiving, from a network entity, a message indicating that the first UE is to transmit multiple S-SSBs within an S-SSB period, the message also indicative of whether the multiple S-SSBs are to be transmitted back-to-back or with an offset between consecutive ones of the multiple S-SSBs, means for determining one or more LBT occasions in association with the multiple S-SSBs, where a timing of the one or more LBT occasions is based on whether the multiple S-SSBs are to be transmitted back-to-back or with the offset between the consecutive ones of the multiple S-SSBs, means for participating in at least one LBT procedure during the one or more LBT occasions, and means for transmitting, to a second UE, the multiple S-SSBs.

A non-transitory computer-readable medium storing code for wireless communication at a first UE is described. The code may include instructions executable by a processor to receive, from a network entity, a message indicating that the first UE is to transmit multiple S-SSBs within an S-SSB period, the message also indicative of whether the multiple S-SSBs are to be transmitted back-to-back or with an offset between consecutive ones of the multiple S-SSBs, determine one or more LBT occasions in association with the multiple S-SSBs, where a timing of the one or more LBT occasions is based on whether the multiple S-SSBs are to be transmitted back-to-back or with the offset between the consecutive ones of the multiple S-SSBs, participate in at least one LBT procedure during the one or more LBT occasions, and transmit, to a second UE, the multiple S-SSBs.

In some examples of the method, apparatuses, and non-transitory computer-readable medium described herein, receiving the message indicating that the first UE may be to transmit multiple S-SSBs within the S-SSB period may include operations, features, means, or instructions for receiving an indication of a sidelink configuration, the sidelink configuration indicating that the first UE may be to transmit the multiple S-SSBs within an S-SSB instance of the S-SSB period.

Some examples of the method, apparatuses, and non-transitory computer-readable medium described herein may further include operations, features, means, or instructions for determining, based at least on a radio resource control (RRC) parameter of the sidelink configuration, a determined quantity of the multiple S-SSBs for inclusion within the S-SSB instance.

In some examples of the method, apparatuses, and non-transitory computer-readable medium described herein, the sidelink configuration defines an interval between starting times of consecutive S-SSB instances, where the interval allows for the multiple S-SSBs to be included within a first S-SSB instance without overlapping a second S-SSB instance of the consecutive S-SSB instances.

In some examples of the method, apparatuses, and non-transitory computer-readable medium described herein, the sidelink configuration indicating that the multiple S-SSBs may be to transmitted within the S-SSB instance may be indicative that the multiple S-SSBs is to be transmitted back-to-back.

In some examples of the method, apparatuses, and non-transitory computer-readable medium described herein, receiving the message indicating that the first UE may be to transmit multiple S-SSBs within the S-SSB period may include operations, features, means, or instructions for receiving an indication of a sidelink configuration, the sidelink configuration indicating that the first UE may be to transmit the multiple S-SSBs within a corresponding multiple S-SSB instances of the S-SSB period.

In some examples of the method, apparatuses, and non-transitory computer-readable medium described herein, transmitting the multiple S-SSBs may include operations, features, means, or instructions for transmitting the multiple S-SSBs back-to-back within the S-SSB period.

In some examples of the method, apparatuses, and non-transitory computer-readable medium described herein, determining the one or more LBT occasions may include operations, features, means, or instructions for identifying a first LBT occasion associated with a temporally first of the multiple S-SSBs, where the at least one LBT occasion during which the first UE participates in the listen-to-talk procedure may be the first LBT occasion, the transmitting of the multiple S-SSBs based on the first UE participating in the LBT procedure during only the first LBT occasion.

In some examples of the method, apparatuses, and non-transitory computer-readable medium described herein, determining the one or more LBT occasions may include operations, features, means, or instructions for identifying a first LBT occasion associated with a temporally first of the multiple S-SSBs, where the first UE participates in an unsuccessful LBT procedure during the first LBT occasion and identifying one or more additional LBT occasions that temporally follow the first LBT occasion, where the at least one LBT occasion during which the first UE participates in the listen-to-talk procedure includes one of the one or more additional LBT occasions after also participating in the unsuccessful LBT procedure.

Some examples of the method, apparatuses, and non-transitory computer-readable medium described herein may further include operations, features, means, or instructions for determining, based on the message, a quantity of the multiple S-SSBs for transmission, where less than the quantity may be transmitted based on the first UE participating in the unsuccessful LBT procedure during the first LBT occasion.

Some examples of the method, apparatuses, and non-transitory computer-readable medium described herein may further include operations, features, means, or instructions for determining that one or more automatic gain control (AGC) or gap symbols may be during a transmission interval for the multiple S-SSBs and transmitting a sidelink broadcast channel during the one or more AGC or gap symbols based on the multiple S-SSBs being transmitted back-to-back.

In some examples of the method, apparatuses, and non-transitory computer-readable medium described herein, transmitting the sidelink broadcast channel may include operations, features, means, or instructions for transmitting the sidelink broadcast channel during a gap symbol by including resource elements of the gap symbol in rate matching or by duplicating a previously transmitted sidelink broadcast channel.

In some examples of the method, apparatuses, and non-transitory computer-readable medium described herein, transmitting the multiple S-SSBs may include operations, features, means, or instructions for transmitting the multiple S-SSBs with the offset between consecutive ones of the multiple S-SSBs.

In some examples of the method, apparatuses, and non-transitory computer-readable medium described herein, determining the one or more LBT occasions may include operations, features, means, or instructions for identifying a set of multiple LBT occasions, each associated with one of the multiple S-SSBs, the transmitting of the multiple S-SSBs based on the first UE participating in the LBT procedure during multiple ones of the set of multiple LBT occasions.

Some examples of the method, apparatuses, and non-transitory computer-readable medium described herein may further include operations, features, means, or instructions for extending a first bandwidth of a primary synchronization signal (PSS) of an S-SSB, a second bandwidth of a secondary synchronization signal (SSS) of one or more of the multiple S-SSBs, and a third bandwidth of a sidelink broadcast channel of the S-SSB within a sidelink BWP based on lowering a coding rate, increasing a payload size, or both.

Some examples of the method, apparatuses, and non-transitory computer-readable medium described herein may further include operations, features, means, or instructions for determining a power for transmitting the one or more S-SSBs or a sidelink broadcast channel based on a quantity of resource blocks for transmitting the one or more S-SSBs or the sidelink broadcast channel for an identified sub-carrier spacing configuration.

A method for wireless communication at a first UE is described. The method may include identifying, via a message, that a second UE is to transmit multiple S-SSBs within an S-SSB period, the message also indicative of whether the multiple S-SSBs are to be transmitted back-to-back or with an offset between consecutive ones of the multiple S-SSBs, monitoring for the multiple S-SSBs transmitted by the second UE in accordance with the message, and receiving, from the second UE, at least one of the multiple S-SSBs.

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, via a message, that a second UE is to transmit multiple S-SSBs within an S-SSB period, the message also indicative of whether the multiple S-SSBs are to be transmitted back-to-back or with an offset between consecutive ones of the multiple S-SSBs, monitor for the multiple S-SSBs transmitted by the second UE in accordance with the message, and receive, from the second UE, at least one of the multiple S-SSBs.

Another apparatus for wireless communication at a first UE is described. The apparatus may include means for identifying, via a message, that a second UE is to transmit multiple S-SSBs within an S-SSB period, the message also indicative of whether the multiple S-SSBs are to be transmitted back-to-back or with an offset between consecutive ones of the multiple S-SSBs, means for monitoring for the multiple S-SSBs transmitted by the second UE in accordance with the message, and means for receiving, from the second UE, at least one of the multiple S-SSBs.

A non-transitory computer-readable medium storing code for wireless communication at a first UE is described. The code may include instructions executable by a processor to identify, via a message, that a second UE is to transmit multiple S-SSBs within an S-SSB period, the message also indicative of whether the multiple S-SSBs are to be transmitted back-to-back or with an offset between consecutive ones of the multiple S-SSBs, monitor for the multiple S-SSBs transmitted by the second UE in accordance with the message, and receive, from the second UE, at least one of the multiple S-SSBs.

In some examples of the method, apparatuses, and non-transitory computer-readable medium described herein, identifying that the second UE may be to transmit multiple S-SSBs within the S-SSB period may include operations, features, means, or instructions for receiving an indication of a sidelink configuration, the sidelink configuration indicating that the second UE may be to transmit the multiple S-SSBs within an S-SSB instance of the S-SSB period.

In some examples of the method, apparatuses, and non-transitory computer-readable medium described herein, the sidelink configuration defines an interval between starting times of consecutive S-SSB instances, where the interval allows for the multiple S-SSBs to be included within a first S-SSB instance without overlapping a second S-SSB instance of the consecutive S-SSB instances.

In some examples of the method, apparatuses, and non-transitory computer-readable medium described herein, the sidelink configuration indicating that the multiple S-SSBs may be to transmitted within the S-SSB instance may be indicative that the multiple S-SSBs is to be transmitted back-to-back.

In some examples of the method, apparatuses, and non-transitory computer-readable medium described herein, identifying that the second UE may be to transmit multiple S-SSBs within the S-SSB period may include operations, features, means, or instructions for receiving an indication of a sidelink configuration, the sidelink configuration indicating that the second UE may be to transmit the multiple S-SSBs within a corresponding multiple S-SSB instances of the S-SSB period.

In some examples of the method, apparatuses, and non-transitory computer-readable medium described herein, receiving at least one of the multiple S-SSBs may include operations, features, means, or instructions for receiving a set of multiple the multiple S-SSBs back-to-back within the S-SSB period.

Some examples of the method, apparatuses, and non-transitory computer-readable medium described herein may further include operations, features, means, or instructions for receiving a sidelink broadcast channel during one or more AGC or gap symbols based on the multiple S-SSBs being received back-to-back.

In some examples of the method, apparatuses, and non-transitory computer-readable medium described herein, receiving at least one of the multiple S-SSBs may include operations, features, means, or instructions for receiving a set of multiple the multiple S-SSBs with the offset between consecutive ones of the multiple S-SSBs.

In some examples of the method, apparatuses, and non-transitory computer-readable medium described herein, receiving at least one of the multiple S-SSBs may include operations, features, means, or instructions for blind detecting for the multiple S-SSBs and determining that a received signal may be one of the multiple S-SSBs based on a comparison of a correlation energy of the received signal with a threshold.

A method for wireless communication at a first UE is described. The method may include identifying a reference frequency position of a reference S-SSB in a sidelink BWP, transmitting, to a second UE, the reference S-SSB in accordance with the reference frequency position, and transmitting, to the second UE, one or more additional S-SSBs whose frequency positions are different from but based on the reference frequency position.

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 reference frequency position of a reference S-SSB in a sidelink BWP, transmit, to a second UE, the reference S-SSB in accordance with the reference frequency position, and transmit, to the second UE, one or more additional S-SSBs whose frequency positions are different from but based on the reference frequency position.

Another apparatus for wireless communication at a first UE is described. The apparatus may include means for identifying a reference frequency position of a reference S-SSB in a sidelink BWP, means for transmitting, to a second UE, the reference S-SSB in accordance with the reference frequency position, and means for transmitting, to the second UE, one or more additional S-SSBs whose frequency positions are different from but based on the reference frequency position.

A non-transitory computer-readable medium storing code for wireless communication at a first UE is described. The code may include instructions executable by a processor to identify a reference frequency position of a reference S-SSB in a sidelink BWP, transmit, to a second UE, the reference S-SSB in accordance with the reference frequency position, and transmit, to the second UE, one or more additional S-SSBs whose frequency positions are different from but based on the reference frequency position.

Some examples of the method, apparatuses, and non-transitory computer-readable medium described herein may further include operations, features, means, or instructions for receiving, from a network entity, a message indicating the reference frequency position of the reference S-SSB in the sidelink BWP.

In some examples of the method, apparatuses, and non-transitory computer-readable medium described herein, transmitting the one or more additional S-SSBs may include operations, features, means, or instructions for transmitting the one or more additional S-SSBs whose frequency positions may be different from but based on the reference frequency position, where the one or more additional S-SSBs may be continuous in frequency.

Some examples of the method, apparatuses, and non-transitory computer-readable medium described herein may further include operations, features, means, or instructions for receiving, from a network entity, signaling indicating a sub-carrier spacing configuration, the sub-carrier spacing configuration indicative of a quantity of S-SSBs to be transmitted in the sidelink BWP by the first UE, the S-SSBs including the reference S-SSB and the one or more additional S-SSBs and identifying the quantity of S-SSBs to be transmitted in the sidelink BWP by the first UE based on receiving the signaling.

Some examples of the method, apparatuses, and non-transitory computer-readable medium described herein may further include operations, features, means, or instructions for receiving, from a network entity, signaling indicating a quantity of S-SSBs to be transmitted in the sidelink BWP by the first UE, the S-SSBs including the reference S-SSB and the one or more additional S-SSBs.

Some examples of the method, apparatuses, and non-transitory computer-readable medium described herein may further include operations, features, means, or instructions for identifying a quantity of S-SSBs to be transmitted in the sidelink BWP by the first UE, where the quantity of S-SSBs may be pre-configured, and where the S-SSBs include the reference S-SSB and the one or more additional S-SSBs.

In some examples of the method, apparatuses, and non-transitory computer-readable medium described herein, transmitting the one or more additional S-SSBs may include operations, features, means, or instructions for transmitting the one or more additional S-SSBs whose frequency positions may be different from but based on the reference frequency position, where the one or more additional S-SSBs may be at least partially discontinuous in frequency.

In some examples of the method, apparatuses, and non-transitory computer-readable medium described herein, a quantity of S-SSBs may be based on a mode of the first UE, where the mode includes a low power indoor mode or a very low power mode, and where the S-SSBs include the reference S-SSBs and the one or more additional S-SSBs.

Some examples of the method, apparatuses, and non-transitory computer-readable medium described herein may further include operations, features, means, or instructions for receiving, from a network entity, signaling indicating a bitmap indicative of a quantity of S-SSBs to be transmitted in the sidelink BWP by the first UE, the S-SSBs including the reference S-SSB and the one or more additional S-SSBs, and where a first bit of the bitmap corresponds to the reference S-SSB.

Some examples of the method, apparatuses, and non-transitory computer-readable medium described herein may further include operations, features, means, or instructions for extending a first bandwidth of a PSS of an S-SSB, a second bandwidth of an SSS of one or more multiple S-SSBs, and a third bandwidth of a sidelink broadcast channel of the S-SSB within a sidelink BWP based on lowering a coding rate, increasing a payload size, or both.

Some examples of the method, apparatuses, and non-transitory computer-readable medium described herein may further include operations, features, means, or instructions for determining a power for transmitting an S-SSB or a sidelink broadcast channel based on a quantity of resource blocks for transmitting the S-SSB or the sidelink broadcast channel with a sub-carrier spacing configuration.

A method for wireless communication at a first UE is described. The method may include identifying a reference frequency position of a reference S-SSB in a sidelink BWP, receiving, from a second UE, the reference S-SSB in accordance with the reference frequency position, and receiving, from the second UE, one or more additional S-SSBs whose frequency positions are different from but based on the reference frequency position.

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 reference frequency position of a reference S-SSB in a sidelink BWP, receive, from a second UE, the reference S-SSB in accordance with the reference frequency position, and receive, from the second UE, one or more additional S-SSBs whose frequency positions are different from but based on the reference frequency position.

Another apparatus for wireless communication at a first UE is described. The apparatus may include means for identifying a reference frequency position of a reference S-SSB in a sidelink BWP, means for receiving, from a second UE, the reference S-SSB in accordance with the reference frequency position, and means for receiving, from the second UE, one or more additional S-SSBs whose frequency positions are different from but based on the reference frequency position.

A non-transitory computer-readable medium storing code for wireless communication at a first UE is described. The code may include instructions executable by a processor to identify a reference frequency position of a reference S-SSB in a sidelink BWP, receive, from a second UE, the reference S-SSB in accordance with the reference frequency position, and receive, from the second UE, one or more additional S-SSBs whose frequency positions are different from but based on the reference frequency position.

Some examples of the method, apparatuses, and non-transitory computer-readable medium described herein may further include operations, features, means, or instructions for receiving, from a network entity, a message indicating the reference frequency position of the reference S-SSB in the sidelink BWP.

In some examples of the method, apparatuses, and non-transitory computer-readable medium described herein, receiving the one or more additional S-SSBs may include operations, features, means, or instructions for receiving the one or more additional S-SSBs whose frequency positions may be different from but based on the reference frequency position, where the one or more additional S-SSBs may be continuous in frequency.

Some examples of the method, apparatuses, and non-transitory computer-readable medium described herein may further include operations, features, means, or instructions for decoding the one or more additional S-SSBs to identify pseudo-noise sequence-based scrambling added to each S-SSB of the one or more additional S-SSBs, where a pseudo-noise sequence of the pseudo-noise sequence-based scrambling may be different for each S-SSB of the one or more additional S-SSBs.

In some examples of the method, apparatuses, and non-transitory computer-readable medium described herein, receiving the one or more additional S-SSBs may include operations, features, means, or instructions for receiving the one or more additional S-SSBs whose frequency positions may be different from but based on the reference frequency position, where the one or more additional S-SSBs may be at least partially discontinuous in frequency.

In some examples of the method, apparatuses, and non-transitory computer-readable medium described herein, a quantity of S-SSBs may be based on a mode of the first UE, where the mode includes a low power indoor mode or a very low power mode, and where the S-SSBs include the reference S-SSBs and the one or more additional S-SSBs.

DETAILED DESCRIPTION

In some wireless communications systems, a user equipment (UE) may perform sidelink communications in an unlicensed band. The UE, if operating in a low power indoor (LPI) mode or a very low power (VLP) mode in an unlicensed, 6 GHz band, may have power spectral density (PSD) and effective isotropic radiated power (EIRP) limitations. For example, a UE operating in the LPI mode in a 6 GHz band may be limited to a PSD of −1 dBm per MHz and a maximum EIRP of 24 dBm. As a result, the UE may transmit 320 MHz to reach the peak power. However, if the UE uses a sidelink synchronization signal block (S-SSB) with a particular bandwidth for sidelink communications in an unlicensed band, the transmit power may be very small such that receiving UEs may be unable to successfully decode the transmissions. In addition, a UE operating in the VLP mode in the 6 GHz band may be limited to a PSD of approximately −18 dBm to −8 dBm per MHz and a maximum EIRP of approximately 4 dBm to 14 dBm, which may cause the UE115to transmit 160 MHz to reach the peak power. As a result, the signal strength of transmitted S-SSBs may decrease, causing receiving UEs to increasingly fail to decode the transmissions.

Techniques described herein enable UEs to transmit S-SSBs in an unlicensed band to support improved sidelink communications. In some examples, a first UE (e.g., a transmit UE) may transmit multiple S-SSB repetitions in the time domain to increase the received signal strength of the transmissions. For example, the first UE may receive a message from a network entity indicating that the first UE is to transmit multiple S-SSBs, back-to-back or with an offset between each S-SSB, within an S-SSB period. The first UE may determine one or more listen-before-talk (LBT) occasions, where a timing for each LBT occasion may be based on whether the S-SSBs are to be transmitted back-to-back or with the offset. In some examples, the first UE may participate in an LBT procedure during the one or more LBT occasions and transmit the multiple S-SSBs to a second UE (e.g., a receive UE). In some other examples, the first UE may transmit multiple S-SSB repetitions in the frequency domain. For example, the first UE may identify a reference position of a reference S-SSB in a sidelink bandwidth part (BWP) in frequency, and transmit the reference S-SSB and one or more additional S-SSBs to the second UE, where the frequency positions of the one or more additional S-SSBs are different from but based on the reference frequency position (e.g., following the reference frequency position).

In some cases, an S-SSB may include multiple synchronization signals, including at least one of a sidelink primary synchronization signal (S-PSS), a sidelink secondary synchronization signal (S-SSS), a physical sidelink broadcast channel (PSBCH), or any combination thereof. To support a wideband S-SSB, the bandwidth of the at least one S-PSS, the at least one S-SSS, and the at least one PSBCH may be extended to span more resource blocks within the sidelink BWP. Additionally, or alternatively, the transmitting UE may determine a power of an S-SSB transmission or a PSBCH transmission based on a quantity of resource blocks for the transmission for a particular sub-carrier spacing (SCS).

Aspects of the disclosure are initially described in the context of wireless communications systems. Aspects of the disclosure are then described in the context of S-SSB repetition schemes, S-SSBs, and process flows. Aspects of the disclosure are further illustrated by and described with reference to apparatus diagrams, system diagrams, and flowcharts that relate to S-SSB transmission in an unlicensed band.

FIG.1illustrates an example of a wireless communications system100that supports S-SSB transmission in an unlicensed band in accordance with one or more aspects of the present disclosure. The wireless communications system100may include one or more network entities105, one or more UEs115, and a core network130. In some examples, the wireless communications system100may be a Long Term Evolution (LTE) network, an LTE-Advanced (LTE-A) network, an LTE-A Pro network, a New Radio (NR) network, or a network operating in accordance with other systems and radio technologies, including future systems and radio technologies not explicitly mentioned herein.

One or more of the network entities105described herein may include or may be referred to as a base station140(e.g., a base transceiver station, a radio base station, an access point, a radio transceiver, a NodeB, an eNodeB (eNB), a next-generation NodeB or a giga-NodeB (either of which may be referred to as a gNB), a next-generation eNB (ng-eNB), a Home NodeB, a Home eNodeB, or other suitable terminology). A network entity105(e.g., a base station140) may be implemented in an aggregated or monolithic base station architecture, or alternatively, in a disaggregated base station architecture. For example, a network entity105may include one or more of a central unit (CU)160, a distributed unit (DU)165, a radio unit (RU)170, a Radio Access Network (RAN) Intelligent Controller (RIC)175(e.g., a Near-Real Time RIC (Near-RT RIC), a Non-Real Time RIC (Non-RT RIC), a Service Management and Orchestration (SMO)180system, or any combination thereof. An RU170may also be referred to as a radio head, a smart radio head, a remote radio head (RRH), a remote radio unit (RRU), or a transmission/reception point (TRP). One or more components of the network entities105of a disaggregated RAN may be co-located, or one or more components of the network entities105may be located in distributed locations.

In some wireless communications systems100, a UE115may transmit sidelink communication in an unlicensed band, which may include a 5 GHz band and a 6 GHz band (e.g., an expanded unlicensed use of the 6 GHz band). Multiple UEs115in the wireless communications system100may perform sidelink communications by transmitting S-SSBs. A bandwidth of an SSB may have a bandwidth spanning 11 physical resource blocks (PRBs) which include a combination of PSBCHs, S-PSSs, S-SSSs, and demodulation reference signals (DMRSs). For example, the S-SSB may include 11 PRBs and 9 OFDM symbols for a normal cyclic prefix (NCP) or 7 OFDM symbols for an extended cyclic prefix (ECP), where a first PSBCH symbol may be used for automatic gain control (AGC) training at a receiving UE115. A PSBCH may include 56 payload bits which include bits for a direct frame number (DFN) (e.g., 10 bits), an indication of a TDD configuration (e.g., 12 bits, which may include system-wide information including a TDD-uplink-downlink common configuration, potential sidelink slots, or both), a slot index (e.g., 7 bits), an in-coverage indicator (e.g., 1 bit), reserve bits (e.g., 2 bits), and a CRC (e.g., 24 bits). In addition, the S-SSB may include S-PSSs, which may span a bandwidth of 127 (e.g., a maximum-length sequence) PRBs, have a same generator or initial value as some Uu PSSs (e.g., with cyclic shifts of 22 and 65), and be repeated on two consecutive symbols. The S-SSB may also include S-SSSs, which may span a bandwidth of 127 (e.g., a Gold-code sequence), have a same generator or initial value and same cyclic shifts as Uu SSSs, and be repeated on two consecutive symbols. Additionally, the S-SSB may include a DMRS in each PSBCH symbol and each fourth resource element, and the last symbol of the S-SSB may include a gap symbol.

In some examples, a UE115may transmit an S-SSB with a periodicity of 160 ms for any SCS. A network entity may configure a quantity of S-SSBs that UEs115may transmit within a period (e.g., 160 ms) for a given SCS. For example, in frequency range 1 (FR1), the UE115may transmit 1 S-SSB in a period for a 15 kHz SCS, 1 or 2 S-SSBs in a period for a 30 kHz SCS, and 1, 2, or 4 S-SSBs in a period for a 60 kHz SCS. In frequency range 2 (FR2), the UE115may transmit up to 32 S-SSBs (e.g., 1, 2, 4, 8, 16, or 32 S-SSBs) in a period for a 60 kHz SCS, and up to 64 S-SSBs (e.g., 1, 2, 4, 8, 16, 32, or 64 S-SSBs) in a period for a 120 kHz SCS. In some examples, a transmit UE115may transmit an S-SSB to a receive UE115(e.g., in sidelink communications with the transmit UE115) to perform a synchronization procedure.

Additionally, or alternatively, a UE115may determine a power for an S-SSB or a PSBCH transmission occasion in a slot. The power may be based on a fixed quantity of PRBs (e.g., 11 PRBs) used for the S-SSB or PSBCH transmission, with a given SCS configuration p. In addition, Point A may serve as a common reference point for resource block grids, where a center of a subcarrier 0 of a common resource block 0 for the SCS configuration μ may coincide with Point A. That is, Point A may be located at the center of the common resource block 0.

In some examples, because of PSD and EIRP limitations on a UE115in the 6 GHz band, the UE115may fail to reach a maximum power for a 20 MHz transmission in an LPI mode or a VLP mode. For example, a UE115operating in the LPI mode in a 6 GHz band may be limited to a PSD of −1 dBm per MHz and a maximum EIRP of 24 dBm, where the PSD (when converted to a linear value), multiplied by the bandwidth, results in the EIRP. As a result, the UE115may transmit 320 MHz to reach the peak power. However if the UE115uses the S-SSB structure of an 11 PRB bandwidth for sidelink communications in an unlicensed band, as described above, the transmit power may be very small such that receiving UEs115may be unable to successfully decode the transmissions. In addition, a UE115operating in the VLP mode in the 6 GHz band may be limited to a PSD of approximately −18 dBm to −8 dBm per MHz and a maximum EIRP of approximately 4 dBm to 14 dBm, which may cause the UE115to transmit 160 MHz to reach the peak power.

The wireless communications system100supports techniques that enable UEs115to transmit S-SSBs in an unlicensed band to support improved sidelink communications. In some examples, a first UE115(e.g., a transmit UE115) may transmit multiple S-SSB repetitions in the time domain to increase the received signal strength of the transmissions. For example, the first UE115may receive a message from a network entity105indicating that the first UE115is to transmit multiple S-SSBs, back-to-back or with an offset between each S-SSB, within an S-SSB period. The first UE115may determine one or more LBT occasions, where a timing for each LBT occasion may be based on whether the S-SSBs are to be transmitted back-to-back or with the offset. In some examples, the first UE115may participate in an LBT procedure during the one or more LBT occasions and transmit the multiple S-SSBs to a second UE115(e.g., a receive UE115). In some other examples, the first UE115may transmit multiple S-SSB repetitions in the frequency domain. For example, the first UE115may identify a reference position of a reference S-SSB in a sidelink BWP in frequency, and transmit the reference S-SSB and one or more additional S-SSBs to the second UE115, where the frequency positions of the one or more additional S-SSBs are different from but based on the reference frequency position (e.g., following the reference frequency position). Accordingly, the transmit UE115may transmit S-SSBs with an increased signal strength, which may improve a success rate of the S-SSB transmissions.

FIG.2illustrates an example of a wireless communications system200that supports S-SSB transmission in an unlicensed band in accordance with one or more aspects of the present disclosure. In some examples, the wireless communications system200may implement aspects of the wireless communications system100or may be implemented by aspects of the wireless communications system100. For example, the wireless communications system200may include a network entity105-a, a UE115-a, and a UE115-b, which may be examples of corresponding devices described herein.

In some examples, the network entity105-a(e.g., a base station, a gNB) may communicate with the UE115-avia a communications link205(e.g., a downlink), and the UE115-amay communicate with the UE115-bvia a sidelink link210. In some examples, the UE115-aand the UE115-bmay operate in an unlicensed band (e.g., a 6 GHz band). As described herein, the UE115-a(e.g., a transmit UE) may transmit multiple S-SSB220repetitions to the UE115-b(e.g., a receive UE) in the time domain or the frequency domain such that the signal strength of an S-SSB220and the success rate of the S-SSB transmission may be improved.

In some cases, the UE115-amay transmit repetitions of the S-SSBs220to the UE115-bin the time domain. The UE115-amay receive a message215from the network entity105-aindicating that the UE115-ais to transmit the S-SSBs220within an S-SSB period to the UE115-b, for example, in multiple slots. The UE115-amay transmit the S-SSBs220back-to-back or non-back-to-back (e.g., with an offset between consecutive S-SSBs220). In some examples, the UE115-amay perform an LBT procedure before transmitting the S-SSBs220to the UE115-b. To do so, the UE115-amay determine one or more LBT occasions in association with the S-SSBs220, where a timing of an LBT procedure is based on whether the S-SSBs220are to be transmitted back-to-back or non-back-to-back.

In some examples, the UE115-amay participate in an LBT procedure during one or more LBT occasions. For example, the UE115-amay participate in a successful LBT procedure during a first LBT occasion before transmitting a first S-SSB220(e.g., an S-SSB220-a). If the LBT procedure fails during the first LBT occasion, the UE115-amay participate in the LBT procedure in one or more additional LBT occasions until the LBT procedure is successful. Following a successful LBT procedure, the UE115-amay transmit at least one of the S-SSB220-a, an S-SSB220-b, and an S-SSB220-cthe UE115-b. For example, if the LBT procedure is successful in the first LBT occasion, the UE115-amay transmit the S-SSB220-a, the S-SSB220-b, the S-SSB220-c, and any other UEs115scheduled to be transmitted within the S-SSB period. If the LBT procedure initially fails in one or more LBT occasions, the UE115-amay transmit fewer LBTs than a quantity initially indicated by the network entity in the message215.

In some examples, the UE115-bmay perform a blind detection procedure for the S-SSBs220transmitted by the UE115-a. For example, the UE115-bmay determine that a received signal is one of the S-SSB220-a, the S-SSB220-b, or the S-SSB220-cbased on a comparison of a correlation energy of the received signal with a threshold. If the correlation energy exceeds a threshold, then the UE115-bmay detect a valid S-SSB.

In some cases, the UE115-amay perform S-SSB repetitions in the frequency domain (e.g., in one resource block set). For example, the UE115-amay identify a reference frequency position of a reference S-SSB in a sidelink BWP. In some examples, the reference S-SSB may be the S-SSB220-a. The UE115-amay transmit the S-SSB220-a(e.g., the reference S-SSB) to the UE115-bvia the sidelink link210in accordance with the reference frequency position. That is, the UE115-amay transmit the reference S-SSB at the beginning of the sidelink BWP. In some cases, the UE115-amay receive the message215from the network entity105-a, which may indicate the reference frequency position. In some examples, the UE115-amay transmit one or more additional S-SSBs220(e.g., the S-SSB220-band the S-SSB220-c) to the UE115-a, where the frequency positions of the one or more additional S-SSBs220may be different from but based on the reference frequency position of the S-SSB220-a. That is, the UE115-amay transmit the S-SSB220-band the S-SSB220-cafter the S-SSB220-a, where the S-SSB220-band the S-SSB220-c(e.g., and any other additional S-SSBs220) may be continuous or discontinuous in the frequency band.

In some cases, the UEs115may extend a bandwidth of an S-PSS, an S-SSS, a PSBCH, or any combination thereof (e.g., in the frequency domain) to support a wideband S-SSB and increase transmit power of the synchronization signals. Additionally, or alternatively, the UE115-amay perform S-SSB or PSBCH power control based on a quantity of resource blocks used to transmit the S-SSB or the PSBCH. For example, the UE115-amay determine a power PS-SSB(i) for an S-SSB transmission or a PSBCH transmission occasion in a slot i by PS-SSB(i)=min(PCMAX, PO,S-SSB+10 log10(2μ·MRBS-SSB)+αS-SSB·PL)[dBm], where PCMAXmay represent a defined maximum power, PO,S-SSBmay represent a value of dl-P0-PSBCH (e.g., if provided, else PS-SSB(i)=PCMAX, αS-SSBmay represent a value of dl-Alpha-PSBCH (e.g., if provided, else αS-SSB=1), PL may represent a value based on a particular resource block, and MRBS-SSBmay represent a quantity of resource blocks for the S-SSB or PSBCH transmission with an SCS configuration μ. As such, the UE115-amay determine the power for the S-SSB or PSBCH transmission based on a particular quantity of resource blocks used for the transmission with a particular SCS configuration, rather than a fixed quantity of resource blocks. In some examples, the UE115-amay control the power in cases where the first UE transmits multiple S-SSB repetitions in the time domain or the frequency domain, or for single S-SSB transmissions.

FIG.3illustrates an example of an S-SSB repetition scheme300that supports S-SSB transmission in an unlicensed band in accordance with one or more aspects of the present disclosure. In some examples, the S-SSB repetition scheme300may implement aspects of the wireless communications systems100and200or may be implemented by aspects of the wireless communications systems100and200. For example, a first UE (e.g., a transmit UE) may transmit S-SSB repetitions to a second UE (e.g., a receive UE) in the time domain according to the S-SSB repetition scheme300.

As described herein, the first UE and the second UE may perform sidelink communications in an unlicensed band. In some examples, the first UE may receive a message from a network entity indicating that the first UE is to transmit S-SSBs305(e.g., multiple S-SSB repetitions) within an S-SSB period315(e.g., spanning 160 ms). In some cases, the message may indicate that the first UE is transmit the repetitions of the S-SSBs305in the time domain (e.g., in multiple slots), for example, to increase a received signal strength of the S-SSBs305. In some examples, the message from the network entity may include a sidelink configuration indicating that the first UE is to transmit the S-SSBs305within an S-SSB instance310of an S-SSB period315. For example, the sidelink configuration may indicate that the first UE is to transmit four S-SSBs305, including an S-SSB305-a(e.g., S-SSB 0) and three other S-SSBs within an S-SSB instance310-aof an S-SSB period315-a, where the S-SSB period315-aspans 160 ms. That is, the sidelink configuration may indicate that the first UE is to transmit four repetitions of the S-SSB305-awithin the S-SSB instance310-a. In some examples, the S-SSB instance310-amay be offset from the beginning of the S-SSB period315-a.

In some examples, a quantity of S-SSB instances310within an S-SSB period315may remain unchanged, where the quantity of S-SSB repetitions (e.g., a repetition number) may be indicated in an RRC parameter (e.g., SL-NumRepetitionSSB in SL-SyncConfig). For example, the first UE may use the RRC parameter to indicate a quantity of S-SSBs305for inclusion within each S-SSB instance (e.g., a repetition number). The first UE may determine the quantity of S-SSBs305for inclusion within each S-SSB instance310based on an RRC parameter of the sidelink configuration indicated by the network entity.

In addition, a time interval320(e.g., sl-TimeInterval) may be configured such that the S-SSBs305in an S-SSB instance310refrain from overlapping with each other after a repetition. For example, a time interval320-amay span the S-SSB instance310-aplus a gap after the S-SSB instance310-a, where the gap provides space between the S-SSB instance310-aand the S-SSB instance310-bto prevent the S-SSB instances310from overlapping with each other. Put another way, the time interval320-amay define an interval between starting times of consecutive S-SSB instances310, such that S-SSBs305may be included in each of the consecutive S-SSB instances310without overlapping.

In some examples, the sidelink configuration indicated by the network entity may indicate that the S-SSBs305in the S-SSB instances310are to be transmitted back-to-back. That is, the first UE may transmit the S-SSBs305(e.g., including the S-SSB305-a) in the S-SSB instance310-aback-to-back with the S-SSBs305(e.g., including an S-SSB305-b) in the S-SSB instance310-b, in accordance with the time interval320-aand during the S-SSB period315-a. The S-SSB instance310-bmay also include four S-SSBs305, including the S-SSB305-b(e.g., S-SSB 1). Additionally, the first UE may transmit the S-SSBs305(e.g., including an S-SSB305-c) in the S-SSB instance310-cback-to-back with the S-SSBs305(e.g., including an S-SSB305-d) in the S-SSB instance310-d, in accordance with a time interval320-band during the S-SSB period315-b(e.g., 160 ms). The S-SSB instance310-cmay be offset from the beginning of the S-SSB period315-b.

FIG.4illustrates an example of an S-SSB repetition scheme400that supports S-SSB transmission in an unlicensed band in accordance with one or more aspects of the present disclosure. In some examples, the S-SSB repetition scheme400may implement aspects of the wireless communications systems100and200or may be implemented by aspects of the wireless communications systems100and200. For example, a first UE (e.g., a transmit UE) may transmit repetitions of S-SSBs405to a second UE (e.g., a receive UE) in the time domain according to the S-SSB repetition scheme400.

In some examples, the first UE and the second UE may perform sidelink communications in an unlicensed band. In some examples, the first UE may receive a message from a network entity indicating that the first UE is to transmit S-SSBs405(e.g., multiple S-SSB repetitions) within an S-SSB period415(e.g., spanning 160 ms) in the time domain (e.g., in multiple slots). The message from the network entity may include a sidelink configuration indicating that the first UE is to transmit the S-SSBs405in multiple S-SSB instances410of an S-SSB period415(e.g., 160 ms). In some examples, the sidelink configuration may indicate that the first UE is to transmit four S-SSBs405in four corresponding S-SSB instances410in an S-SSB period415-a. For example, the sidelink configuration may indicate that the first UE is to transmit an S-SSB405-ain an S-SSB instance410-a(e.g., an S-SSB instance 0), an S-SSB405-bin an S-SSB instance410-b(e.g., an S-SSB instance 1), an S-SSB405-cin an S-SSB instance410-c(e.g., an S-SSB instance 2), and an S-SSB405-din an S-SSB instance410-d(e.g., an S-SSB instance 3) during the S-SSB period415-a. That is, the first UE may transmit four repetitions of the S-SSBs405in four repeated S-SSB instances410during the S-SSB period415-a(e.g., with a repetition number, K=4) back-to-back. In some other cases, the S-SSBs405may be transmitted non-back-to-back (e.g., with an offset between each S-SSB405). In addition, the S-SSB instances410may be offset from the beginning of the S-SSB period415-a.

In addition, the sidelink configuration may indicate that the first UE is to transmit four additional S-SSBs repetitions in four corresponding S-SSB instances410in an S-SSB period415-b. For example, the sidelink configuration may indicate that the first UE is to transmit an S-SSB405-ein an S-SSB instance410-e(e.g., an S-SSB instance 0), an S-SSB405-fin an S-SSB instance410-f(e.g., an S-SSB instance 1), an S-SSB405-gin an S-SSB instance410-g(e.g., an S-SSB instance 2), and an S-SSB405-hin an S-SSB instance410-h(e.g., an S-SSB instance 3) during the S-SSB period415-b. That is, the first UE may transmit four repetitions of the S-SSBs405in four repeated S-SSB instances410during the S-SSB period415-b(e.g., with a repetition number, K=4) back-to-back. In some other cases, the S-SSBs405may be transmitted non-back-to-back (e.g., with an offset between each S-SSB405). In addition, the S-SSB instances410may be offset from the beginning of the S-SSB period415-b.

In some examples, the quantity of S-SSBs repetitions repeated in multiple S-SSB instances410within an S-SSB period415may be increased. For example, instead of transmitting a single S-SSB repetition, the first UE may transmit multiple repetitions of the S-SSBs405in multiple S-SSB instances410according to a repetition number K, which may be increased to K={1, 2, 4} for a 15 kHz SCS and to K={1, 2, 4, 8} for a 30 kHz SCS. That is, using the example inFIG.4, the first UE may transmit up to 4 repetitions of S-SSBs405in the corresponding S-SSB instances410during the S-SSB period415-aor the S-SSB period415-bfor a 15 kHz SCS and up to 8 repetitions of S-SSBs405in the corresponding S-SSB instances410during the S-SSB period415-aor the S-SSB period415-bfor a 30 kHz SCS.

FIG.5illustrates an example of an S-SSB repetition scheme500that supports S-SSB transmission in an unlicensed band in accordance with one or more aspects of the present disclosure. In some examples, the S-SSB repetition scheme500may implement aspects of the wireless communications systems100and200or may be implemented by aspects of the wireless communications systems100and200. For example, a first UE (e.g., a transmit UE) may transmit repetitions of an S-SSB505to a second UE (e.g., a receive UE) in the time domain and according to the S-SSB repetition scheme500.

The first UE and the second UE may perform sidelink communications in an unlicensed band. In some examples, the first UE may receive a message from a network entity indicating that the first UE is to transmit multiple S-SSBs505(e.g., S-SSB repetitions) within an S-SSB period510(e.g., spanning 160 ms). In some cases, the message may indicate that the first UE is to transmit the repetitions of the S-SSBs505back-to-back in the time domain (e.g., in multiple slots) within an S-SSB period510. For example, the first UE may be configured to transmit an S-SSB505-a, an S-SSB505-b, an S-SSB505-c, and an S-SSB505-dwithin an S-SSB period510-awithout an offset between each consecutive S-SSB505.

The first UE may determine one or more LBT occasions515in association with the S-SSBs505, where a timing of the LBT occasions515may be based on the first UE transmitting the S-SSBs505back-to-back. For example, the first UE may identify an LBT occasion515-a(e.g., a first LBT occasion) associated with a temporally first S-SSB505transmitted within the S-SSB period510-a(e.g., the S-SSB505-a). The first UE may participate in an LBT procedure during the LBT occasion515-a. If the LBT procedure is successful, the first UE may transmit the S-SSB505-a, the S-SSB505-b, the S-SSB505-c, and the S-SSB505-dto the second UE. As such, the first UE may refrain from performing additional LBT procedures before transmitting the S-SSB505-b, the S-SSB505-c, and the S-SSB505-d.

In some cases, the first UE may perform one or more LBT procedures at different times (e.g., starting points) to prevent LBT failure, where the different times may correspond to LBT occasions515. As the timing of the LBT occasions515may be based on the S-SSBs505being transmitted back-to-back, the LBT occasions515may occur before each S-SSB505is to be transmitted before the first UE. If an LBT procedure fails during the LBT occasion515-a, the first UE may participate in a second LBT procedure before a different S-SSB505. For example, the message from the network entity may indicate that the first UE is to transmit an S-SSB505-e, an S-SSB505-f, an S-SSB505-g, and an S-SSB505-hwithin an S-SSB period510-b.

The first UE may identify an LBT occasion515-b(e.g., a first LBT occasion) associated with a temporally first S-SSB505transmitted within the S-SSB period510-b(e.g., the S-SSB505-e). The first UE may participate in a first LBT procedure during the LBT occasion515-b, which may be unsuccessful. Accordingly, the first UE may identify one or more additional LBT occasions515that temporally follow the LBT occasion515-b, including an LBT occasion515-c. The first UE may participate in an LBT procedure during the LBT occasion515-c, and transmit the S-SSB505-f, the S-SSB505-g, and the S-SSB505-hwithin the S-SSB period510-bto the second UE if the LBT procedure during the LBT occasion515-cis successful. That is, the quantity of S-SSB repetitions (e.g., repeated S-SSBs505) transmitted by the first UE (e.g., three S-SSBs, including the S-SSB505-f, the S-SSB505-g, and the S-SSB505-h) may be less than a quantity of S-SSB repetitions indicated by a network entity (e.g., the initial four S-SSBs, including the S-SSB505-e, the S-SSB505-f, the S-SSB505-g, and the S-SSB505-h). Put another way, the first UE may transmit a quantity of S-SSBs505that is less than the quantity indicated by the network entity based on participating in the unsuccessful LBT procedure during the LBT occasion515-b.

In some examples, the first UE may perform an unsuccessful LBT procedure during LBT occasions515. For example, message from the network entity may indicate that the first UE is to transmit an S-SSB505-i, an S-SSB505-j, an S-SSB505-k, and an S-SSB505-lwithin an S-SSB period510-c. The first UE may identify an LBT occasion515-d(e.g., a first LBT occasion) associated with a temporally first S-SSB505within the S-SSB period510-c(e.g., the S-SSB505-i). The first UE may participate in a first LBT procedure during the LBT occasion515-d, which may be unsuccessful. After the unsuccessful first LBT procedure during the LBT occasion515-d, the first UE may identify one or more additional LBT occasions515that temporally follow the LBT occasion515-d, including an LBT occasion515-e, an LBT occasion515-f, and an LBT occasion515-g. The first UE may participate in an unsuccessful LBT procedure during each of the LBT occasion515-eand the LBT occasion515-fand a successful LBT procedure during the LBT occasion515-g. Based on performing the successful LBT procedure during the LBT occasion515-g, the first UE may transmit the S-SSB505-lto the second UE. As such, the quantity of S-SSB repetitions (e.g., repeated S-SSBs505) transmitted by the first UE (e.g., one S-SSB505-l) may be less than a quantity of S-SSB repetitions indicated by a network entity based on participating in the unsuccessful LBT procedure during the LBT occasion515-d, the LBT occasion515-e, and the LBT occasion515-f.

FIG.6illustrates an example of an S-SSB repetition scheme600that supports S-SSB transmission in an unlicensed band in accordance with one or more aspects of the present disclosure. In some examples, the S-SSB repetition scheme600may implement aspects of the wireless communications systems100and200or may be implemented by aspects of the wireless communications systems100and200. For example, a first UE (e.g., a transmit UE) may transmit an S-SSB605to a second UE (e.g., a receive UE), where multiple S-SSBs605may be repeated in the time domain.

In some examples, the first UE may transmit more than one S-SSB605continuously. For example, the first UE may continuously transmit an S-SSB605-aand an S-SSB605-b, or the first UE may continuously transmit an S-SSB605-cand an S-SSB605-d. Each S-SSB605may each include at least one of an S-PSS symbol615, an S-SSS symbol620, a PSBCH symbol625, and a gap symbol630. In some examples, one AGC symbol610may be included in a continuous transmission of S-SSBs605. For example, if the S-SSB605-aand the S-SSB605-bare transmitted continuously, the AGC symbol610-amay be the only AGC symbol610in both S-SSBs605. In some examples, when multiple S-SSBs605are transmitted continuously, any internal AGC symbols (e.g., the AGC symbol610-a), gap symbols630, or both included between the continuously transmitted S-SSBs605may be used for a PSBCH transmission (e.g., may effectively be PSBCH symbols625).

In the case that the first UE transmits the S-SSB605-aand the S-SSB605-bcontinuously, the first symbol of the S-SSB605-amay be the AGC symbol610-a, which in some cases may be used for PSBCH transmissions. Additionally, or alternatively, the last symbol of the S-SSB605-amay be a gap symbol630, and as such, may be used for a PSBCH transmission as a PSBCH symbol625-a. For example, the resource elements in the gap symbol630may be considered in a rate matching procedure to achieve a lower coding rate. As such, the first UE may select a specific set of bits associated with the resource elements for transmission of a PSBCH. The last symbol of the S-SSB605-bmay include a gap symbol630-a, which may be the end of the continuous transmission of the S-SSB605-aand the S-SSB605-b.

In the case that the first UE transmits the S-SSB605-cand the S-SSB605-dcontinuously, an AGC symbol610-bmay be the only AGC symbol610for both S-SSBs605. That is, the first symbol of the S-SSB605-cmay be the AGC symbol610-b, which in some cases may be used for PSBCH transmissions. Additionally, or alternatively, the last symbol of the S-SSB605-cmay be a gap symbol630, and as such, may be used for a PSBCH transmission as a PSBCH symbol625-b. For example, the first UE may duplicate the PSBCH symbol625-c(e.g., the previous symbol) onto the last symbol of the S-SSB605-csuch that the PSBCH symbol625-bis a duplicate of the PSBCH symbol625-c. The last symbol of the S-SSB605-dmay include a gap symbol630-b, which may be the end of the continuous transmission of the S-SSB605-cand the S-SSB605-d.

In some cases, when transmitting the repetitions of the S-SSBs605, timing information associated with the S-SSBs605may be in increasing order and independent of a PSBCH payload. In some examples, an N quantity of least-significant bits (LSBs) of a slot index may be used for DMRS scrambling. For example, if there are four repetitions of the S-SSBs605and the first UE transmits the S-SSBs605back-to-back, then two LSBs of the slot index may be used for DMRS scrambling. In this case, five most-significant bits (MSBs) of the slot index may be the same for each of the four S-SSBs, different timing information may be carried in the DMRS. As such, the S-SSB combination may be performed directly. Put another way, the MSBs may be carried in a PSBCH payload, and the LSBs may be carried in the DMRS.

FIG.7illustrates an example of an S-SSB repetition scheme700that supports S-SSB transmission in an unlicensed band in accordance with one or more aspects of the present disclosure. In some examples, the S-SSB repetition scheme700may implement aspects of the wireless communications systems100and200or may be implemented by aspects of the wireless communications systems100and200. For example, a first UE (e.g., a transmit UE) may transmit repetitions of S-SSBs705to a second UE (e.g., a receive UE) according to the S-SSB repetition scheme700.

As described herein, the first UE and the second UE may perform sidelink communications in an unlicensed band. In some examples, the first UE may receive a message from a network entity indicating that the first UE is to transmit multiple S-SSBs705(e.g., S-SSB repetitions) within an S-SSB period710. In some cases, the message may indicate that the first UE is to transmit the repetitions of the S-SSBs705in the time domain (e.g., in multiple slots). For example, the message may indicate that the first UE is to transmit an S-SSB705-a, an S-SSB705-b, an S-SSB705-c, and an S-SSB705-dwithin the S-SSB period710. The first UE may transmit the S-SSBs705non-back-to-back (e.g., with an offset between consecutive S-SSBs705). That is, the first UE may transmit the S-SSB705-a, and after an offset, the first UE may transmit the S-SSB705-b, and so on.

In some cases, the first UE may determine one or more LBT occasions715in association with the S-SSBs705, where a timing of the LBT occasions715may be based on the first UE transmitting the S-SSBs705non-back-to-back. The first UE may identify multiple LBT occasions715, each associated with one of the multiple S-SSBs705to be transmitted by the first UE. For example, the first UE may identify an LBT occasion715-aassociated with the S-SSB705-a, an LBT occasion715-bassociated with the S-SSB705-b, an LBT occasion715-cassociated with the S-SSB705-c, and an LBT occasion715-dassociated with the S-SSB705-d. The first UE may participate in an LBT procedure during the LBT occasion715-a(e.g., a first LBT occasion). If the first LBT procedure is unsuccessful, the first UE may have a higher probability of performing a successful LBT procedure during the LBT occasion715-bas the LBT occasion715-bmay experience less interference than the LBT occasion715-a(e.g., a time interval between two LBT occasions715is much larger than a time interval between back-to-back S-SSB transmissions). That is, the LBT occasion715-amay experience greater interference since it occurs before any S-SSB transmissions.

In some examples, the first UE may participate in an LBT procedure between other LBT occasions715. For example, if the LBT procedure is unsuccessful during the LBT occasion715-a, the first UE may participate in the LBT procedure during the LBT occasion715-bor the LBT occasion715-cand the LBT occasion715-d. The first UE may transmit the S-SSBs705based on the first UE participating in the LBT procedure during multiple LBT occasions715. For example, if the LBT procedure is successful during the LBT occasion715-b, the first UE may transmit the S-SSB705-b, the S-SSB705-c, and the S-SSB705-d.

FIG.8illustrates an example of an S-SSB repetition scheme800that supports S-SSB transmission in an unlicensed band in accordance with one or more aspects of the present disclosure. In some examples, the S-SSB repetition scheme800may implement aspects of the wireless communications systems100and200or may be implemented by aspects of the wireless communications systems100and200. For example, a first UE (e.g., a transmit UE) may transmit repetitions of S-SSBs805to a second UE (e.g., a receive UE) in the frequency domain according to the S-SSB repetition scheme800.

As described herein, the first UE may identify a reference frequency position of a reference S-SSB in a sidelink BWP. The reference S-SSB may be an S-SSB805-a(e.g., located at one side of the sidelink BWP). In some cases, the reference frequency position may be pre-configured, or the first UE may receive a message from a network entity indicating the reference frequency position. The first UE may transmit the S-SSB805-ato the second UE in accordance with the reference frequency position. In addition, the first UE may transmit one or more additional S-SSBs805to the second UE, where the frequency positions of the one or more additional S-SSBs805may be different from but based on the reference frequency position. For example, the first UE may transmit an S-SSB805-b, an S-SSB805-c, and an S-SSB805-dafter the S-SSB805-a(e.g., the S-SSB repetitions begin after the S-SSB805-a). In addition, the S-SSB805-b, the S-SSB805-c, and the S-SSB805-d(e.g., and any other S-SSBs805after the S-SSB805-a) may be continuous in frequency.

In some examples, a quantity of S-SSBs805to be transmitted in one resource block set (e.g., in the sidelink BWP) may be hardcoded in association with an SCS. For example, the first UE may receive signaling from a network entity indicating an SCS configuration, the SCS configuration indicative of a quantity of S-SSBs805to be transmitted in the sidelink BWP by the first UE. The quantity of S-SSBs805may include the reference S-SSB (e.g., the S-SSB805-a) and the one or more additional S-SSBs805(e.g., the S-SSB805-b, the S-SSB805-c, and the S-SSB805-d). For example, the network entity may indicate a quantity of eight S-SSBs805for a 15 kHz SCS and four S-SSBs805for a 30 kHz SCS. In some examples, the network entity may transmit the indication of the SCS configuration in RRC signaling. In some cases, the quantity of S-SSBs805to be transmitted in the sidelink BWP by the first UE may be indicated directly via signaling (e.g., RRC signaling). That is, the network entity may transmit the signaling to the first UE indicating the quantity of S-SSBs805. In some other cases, the quantity of S-SSBs805to be transmitted in the sidelink BWP by the first UE may be pre-configured.

To reduce a peak-to-average-power ratio (PAPR) associated with transmitting the multiple S-SSBs805, the first UE may add a pseudo-noise sequence-based scrambling to each S-SSB805to encode each S-SSB805. In some examples, a long scrambling sequence may be generated that spans across a quantity of N S-SSBs805, where the long scrambling sequence may be divided into N pieces and applied to each S-SSB805individually. For example, the S-SSB805-amay be associated with a first sequence (e.g., sequence #1), the S-SSB805-bmay be associated with a second sequence (e.g., sequence 2), the S-SSB805-cmay be associated with a third sequence (e.g., sequence #3), and the S-SSB805-dmay be associated with a fourth sequence (e.g., sequence #4). If the second UE is aware of at least one of the sequences applied to an S-SSB805, the second UE may determine the other three sequences. That is, the second UE may decode the S-SSB805-b, the S-SSB805-c, and the S-SSB805-dto identify the pseudo-noise sequence-based scrambling added to each S-SSB805, where the pseudo-noise sequence-based scrambling may be different for each S-SSB805.

FIG.9illustrates an example of an S-SSB repetition scheme900that supports S-SSB transmission in an unlicensed band in accordance with one or more aspects of the present disclosure. In some examples, the S-SSB repetition scheme900may implement aspects of the wireless communications systems100and200or may be implemented by aspects of the wireless communications systems100and200. For example, a first UE (e.g., a transmit UE) may transmit multiple repetitions of an S-SSB905to a second UE (e.g., a receive UE) in the frequency domain (e.g., in multiple resource block sets) in accordance with the S-SSB repetition scheme900.

In some examples, the first UE may identify a reference frequency position of a reference S-SSB in a sidelink BWP. The reference S-SSB may be the S-SSB905-a, and may be located in a particular resource block set910in a sidelink BWP. For example, the sidelink BWP may include a resource block set910-a(e.g., resource block set #1), a resource block set910-b(e.g., resource block set #2), a resource block set910-c(e.g., resource block set #3), a resource block set910-d(e.g., resource block set #4), and a resource block set910-e(e.g., resource block set #5). As such, the S-SSB905-amay be located in the resource block set910-b(e.g., a second resource block set910) in the sidelink BWP, and the resource block set910-a(e.g., a first resource block set910) may be empty. In addition, the S-SSB905-amay be located closest to a point A, where the point A may serve as a common reference point for resource block grids, and where a center of a subcarrier 0 of a common resource block 0 for the SCS configuration μ may coincide with the point A.

In some cases, the reference frequency position may be pre-configured, or the first UE may receive a message from a network entity indicating the reference frequency position. The first UE may transmit the S-SSB905-ato the second UE in accordance with the reference frequency position (e.g., using the resource block set910-b). In addition, the first UE may transmit one or more additional S-SSBs905to the second UE, where the frequency positions of the one or more additional S-SSBs905may be different from but based on the reference frequency position. For example, the first UE may transmit an S-SSB905-bin the resource block set910-dand an S-SSB905-cin the resource block set910-e, such that the repetitions of the S-SSBs905may be transmitted after the S-SSB905-aand the resource block set910-cmay be empty. In addition, the S-SSB905-band the S-SSB905-cmay be continuous or discontinuous in frequency (e.g., at least partially discontinuous in frequency).

In some examples, a quantity of S-SSBs905to be transmitted in the multiple resource block sets910in the sidelink BWP may be hardcoded in association with a mode of the first UE (e.g., a device mode). The quantity of S-SSBs905may include the reference S-SSB (e.g., the S-SSB905-a) and the one or more additional S-SSBs905(e.g., the S-SSB905-band the S-SSB805-c). For example, sixteen S-SSBs905may be configured for an LPI and eight S-SSBs905may be configured for a VLP mode. In some other examples, the quantity of S-SSBs905to be transmitted in the sidelink BWP by the first UE may be pre-configured.

In some cases, the network entity may transmit an indication of the quantity of S-SSBs905to be transmitted in the sidelink BWP by the first UE via signaling (e.g., RRC signaling). The signaling may include a bitmap used to indicate the quantity of S-SSBs905. In some examples, each bit in the bitmap may correspond to one resource block set910. As such, a “1” bit may indicate that an S-SSB905is to be transmitted in a corresponding resource block set910, and a “0” but may indicate that a corresponding resource block set910is empty (e.g., no S-SSB905may be transmitted in that resource blocks set910). In addition, to reduce signaling overhead, a first bit of the bitmap may correspond to the resource block set910that includes the S-SSB905-a(e.g., the reference S-SSB). For example, the signaling may include a bitmap1011, and the corresponding bits (e.g., 1, 0, 1, 1) may correspond to the resource block set910-b, the resource block set910-c, the resource block set910-d, and the resource block set910-e, respectively, such that the first bit corresponds to the second resource block set910(e.g., the resource block set910-b) and the first resource block set910(e.g., the resource block set910-a) may lack association with a bit in the bitmap.

To reduce a PAPR associated with transmitting the multiple S-SSBs905, the first UE may add a pseudo-noise sequence-based scrambling to each S-SSB905to encode each S-SSB905. In some examples, a long scrambling sequence may be generated that spans across a quantity of N S-SSBs905, where the long scrambling sequence may be divided into N pieces and applied to each S-SSB905individually. For example, the S-SSB905-amay be associated with a first sequence (e.g., sequence #1), the S-SSB905-bmay be associated with a second sequence (e.g., sequence 2), and the S-SSB905-cmay be associated with a third sequence (e.g., sequence #3). If the second UE is aware of at least one of the sequences applied to an S-SSB905, the second UE may determine the other three sequences. That is, the second UE may decode the S-SSB905-band the S-SSB905-cto identify the pseudo-noise sequence-based scrambling added to each S-SSB905, where the pseudo-noise sequence-based scrambling may be different for each S-SSB905.

FIG.10illustrates an example of an S-SSB1000that supports S-SSB transmission in an unlicensed band in accordance with one or more aspects of the present disclosure. In some examples, the S-SSB1000may implement aspects of the wireless communications systems100and200or may be implemented by aspects of the wireless communications systems100and200. In some examples, the S-SSB1000may include at least one of an S-PSS symbol1005, an S-SSS symbol1010, a PSBCH symbol1015, and a gap symbol1020.

In some examples, a first UE (e.g., a transmit UE) may extend a bandwidth of an S-PSS symbol1005, an S-SSS symbol1010, a PSBCH symbol1015, or any combination thereof (e.g., in the frequency domain) to support a wideband S-SSB. For example, the first UE may extend the bandwidth of an S-PSS symbol1005and an S-SSS symbol1010from 127 resource blocks to X resource blocks, where X=2n−1, 7≤n≤9 (e.g., in some examples, X=511). Based on increasing the bandwidths used for transmitting P-SSSs and S-SSSs, an associated transmit power may also be increased. In the frequency domain, the S-SSB1000may span a quantity of M=[X/12] resource blocks within a sidelink BWP (e.g., M=43 resource blocks). In addition, the first UE may extend the bandwidth of a PSBCH symbol1015to [X/12] resource blocks. In some cases, a wideband PSBCH in this way may be implemented via a lower coding rate or a larger payload size. In some examples, the wideband S-SSB may be implemented in cases where the first UE transmits multiple S-SSB repetitions in the time domain or the frequency domain, or the wideband S-SSB may be implemented for single S-SSB transmissions.

FIG.11illustrates an example of a process flow1100that supports S-SSB transmission in an unlicensed band in accordance with one or more aspects of the present disclosure. The process flow1100may implement aspects of wireless communications systems100and200, or may be implemented by aspects of the wireless communications system100and200. For example, the process flow1100may illustrate operations between a UE115-c, a UE115-d, and a network entity105-b, which may be examples of corresponding devices described herein. In the following description of the process flow1100, the operations between the UE115-c, the UE115-d, and the network entity105-bmay be transmitted in a different order than the example order shown, or the operations performed by the UE115-c, the UE115-d, and the network entity105-bmay be performed in different orders or at different times. Some operations may also be omitted from the process flow1100, and other operations may be added to the process flow1100.

At1105, the UE115-c(e.g., a transmit UE) may receive, from the network entity105-b, a message indicating that the UE115-cis to transmit multiple S-SSBs within an S-SSB period, the message also indicative of whether the multiple S-SSBs are to be transmitted back-to-back or with an offset between consecutive ones of the multiple S-SSBs (e.g., non-back-to-back). In some examples, the message may indicate that the UE115-cis to transmit the multiple S-SSBs in an S-SSB instance within the S-SSB period. At1110, the UE115-d(e.g., a receive UE) may identify (e.g., via a message) that the UE115-cis to transmit the multiple S-SSBs within the S-SSB period.

At1115, the UE115-cmay determine one or more LBT occasions in association with the multiple S-SSBs, where a timing of the one or more LBT occasions is based on whether the multiple S-SSBs are to be transmitted back-to-back or with the offset between the consecutive ones of the multiple S-SSBs. For example, the UE115-cmay identify a first LBT occasion associated with a temporally first of the multiple S-SSBs. In addition, the UE115-cmay identify multiple other LBT occasions after the first LBT occasion, during which the UE115-cmay participate in LBT procedures if a first LBT procedure during the first LBT occasion is unsuccessful.

At1120, the UE115-cmay participate in at least one LBT procedure during the one or more LBT occasions. For example, the UE115-cmay participate in an LBT procedure during the first LBT occasion, which may be successful or unsuccessful. In the case that the first LBT procedure is unsuccessful, the UE115-cmay participate in the LBT procedure during one or more additional LBT occasions until it is successful.

At1125, the UE115-dmay monitor for the multiple S-SSBs transmitted by the UE115-c. At1130, the UE115-cmay transmit the multiple S-SSBs to the UE115-d. In some examples, the UE115-cmay transmit the multiple S-SSBs back-to-back or with the offset between consecutive S-SSBs within an S-SSB period. In addition, the UE115-cmay transmit the multiple S-SSBs continuously, in which case internal AGC or gap symbols may be used for PSBCH transmissions.

At1135, the UE115-cmay extend a first bandwidth of a P-SSS of an S-SSB, a second bandwidth of an S-SSS of an S-SSB, or a third bandwidth of a PSBCH of an S-SSB within a sidelink BWP. For example, the third bandwidth of the PSBCH may be extended based on lowering a coding rate, increasing a payload size, or both. The UE115-cmay extend the bandwidths of the P-SSS, the S-SSS, the PSBCH, or any combination thereof in cases where the UE115-ctransmits multiple repetitions of the S-SSB in the time domain, or in cases where the UE115-ctransmits a single S-SSB.

At1140, the UE115-cmay determine a power for transmitting the multiple S-SSBs or a PSBCH based on a quantity of resource blocks for transmitting the multiple S-SSBs or the PSBCH for an identified SCS configuration. That is, the power may be based on a particular quantity of resource blocks rather than a fixed quantity representing a bandwidth of an S-SSB.

FIG.12illustrates an example of a process flow1200that supports S-SSB transmission in an unlicensed band in accordance with one or more aspects of the present disclosure. The process flow1200may implement aspects of wireless communications systems100and200, or may be implemented by aspects of the wireless communications system100and200. For example, the process flow1200may illustrate operations between a UE115-e, a UE115-f, and a network entity105-c, which may be examples of corresponding devices described herein. In the following description of the process flow1200, the operations between the UE115-e, the UE115-f, and the network entity105-cmay be transmitted in a different order than the example order shown, or the operations performed by the UE115-e, the UE115-f, and the network entity105-cmay be performed in different orders or at different times. Some operations may also be omitted from the process flow1200, and other operations may be added to the process flow1200.

At1205, the UE115-e(e.g., a transmit UE) may identify a reference position of a reference S-SSB in a sidelink BWP. For example, the reference position may be at the start of the sidelink BWP. In some examples, the reference position may be indicated in a message transmitted the network entity105-c. At1210, the UE115-f(e.g., a receive UE) may identify a reference position of a reference S-SSB in a sidelink BWP. For example, the reference position may be at the start of the sidelink BWP. In some examples, the reference position may be indicated in a message transmitted by the network entity105-c.

At1215, the UE115-emay receive signaling from the network entity105-cindicating an SCS configuration indicative of a quantity of S-SSBs to be transmitted in the sidelink BWP by the UE115-e, where the quantity of S-SSBs may include the reference S-SSB and one or more additional S-SSBs, and where the UE115-emay identify the quantity of S-SSBs to transmit based on receiving the signaling. Additionally, or alternatively, the signaling may directly indicate the quantity of S-SSBs to be transmitted in the sidelink BWP by the UE115-e(e.g., via RRC signaling).

At1220, the UE115-emay transmit, to the UE115-f, the reference S-SSB in accordance with the reference frequency position. For example, the UE115-emay transmit the reference S-SSB at the beginning of the sidelink BWP.

At1225, the UE115-emay transmit, to the UE115-f, the one or more additional S-SSBs whose frequency positions are different from but based on the reference frequency position. For example, the frequency positions of the one or more additional S-SSBs may be after the reference S-SSB in the frequency domain. In addition, the one or more additional S-SSBs may be continuous or at least partially discontinuous in frequency, and may be transmitted per resource block or per resource block set.

At1230, the UE115-emay extend a first bandwidth of a P-SSS of an S-SSB, a second bandwidth of an S-SSS of an S-SSB, or a third bandwidth of a PSBCH of an S-SSB within a sidelink BWP. For example, the third bandwidth of the PSBCH may be extended based on lowering a coding rate, increasing a payload size, or both. The UE115-emay extend the bandwidths of the P-SSS, the S-SSS, the PSBCH, or any combination thereof in cases where the UE115-etransmits the one or more additional S-SSBs, or in cases where the UE115-etransmits a single S-SSB.

At1235, the UE115-emay determine a power for transmitting the one or more additional S-SSBs or a PSBCH based on a quantity of resource blocks for transmitting the one or more additional S-SSBs or the PSBCH for an identified SCS configuration. That is, the power may be based on a particular quantity of resource blocks rather than a fixed quantity representing a bandwidth of an S-SSB.

FIG.13shows a block diagram1300of a device1305that supports S-SSB transmission in an unlicensed band in accordance with one or more aspects of the present disclosure. The device1305may be an example of aspects of a UE115as described herein. The device1305may include a receiver1310, a transmitter1315, and a communications manager1320. The device1305may also include a processor. Each of these components may be in communication with one another (e.g., via one or more buses).

The receiver1310may provide a means for receiving information such as packets, user data, control information, or any combination thereof associated with various information channels (e.g., control channels, data channels, information channels related to S-SSB transmission in an unlicensed band). Information may be passed on to other components of the device1305. The receiver1310may utilize a single antenna or a set of multiple antennas.

The transmitter1315may provide a means for transmitting signals generated by other components of the device1305. For example, the transmitter1315may transmit information such as packets, user data, control information, or any combination thereof associated with various information channels (e.g., control channels, data channels, information channels related to S-SSB transmission in an unlicensed band). In some examples, the transmitter1315may be co-located with a receiver1310in a transceiver module. The transmitter1315may utilize a single antenna or a set of multiple antennas.

The communications manager1320, the receiver1310, the transmitter1315, or various combinations thereof or various components thereof may be examples of means for performing various aspects of S-SSB transmission in an unlicensed band as described herein. For example, the communications manager1320, the receiver1310, the transmitter1315, or various combinations or components thereof may support a method for performing one or more of the functions described herein.

In some examples, the communications manager1320may be configured to perform various operations (e.g., receiving, obtaining, monitoring, outputting, transmitting) using or otherwise in cooperation with the receiver1310, the transmitter1315, or both. For example, the communications manager1320may receive information from the receiver1310, send information to the transmitter1315, or be integrated in combination with the receiver1310, the transmitter1315, or both to obtain information, output information, or perform various other operations as described herein.

The communications manager1320may support wireless communication at a first UE in accordance with examples as disclosed herein. For example, the communications manager1320may be configured as or otherwise support a means for receiving, from a network entity, a message indicating that the first UE is to transmit multiple S-SSBs within an S-SSB period, the message also indicative of whether the multiple S-SSBs are to be transmitted back-to-back or with an offset between consecutive ones of the multiple S-SSBs. The communications manager1320may be configured as or otherwise support a means for determining one or more LBT occasions in association with the multiple S-SSBs, where a timing of the one or more LBT occasions is based on whether the multiple S-SSBs are to be transmitted back-to-back or with the offset between the consecutive ones of the multiple S-SSBs. The communications manager1320may be configured as or otherwise support a means for participating in at least one LBT procedure during the one or more LBT occasions. The communications manager1320may be configured as or otherwise support a means for transmitting, to a second UE, the multiple S-SSBs.

Additionally, or alternatively, the communications manager1320may support wireless communication at a first UE in accordance with examples as disclosed herein. For example, the communications manager1320may be configured as or otherwise support a means for identifying, via a message, that a second UE is to transmit multiple S-SSBs within an S-SSB period, the message also indicative of whether the multiple S-SSBs are to be transmitted back-to-back or with an offset between consecutive ones of the multiple S-SSBs. The communications manager1320may be configured as or otherwise support a means for monitoring for the multiple S-SSBs transmitted by the second UE in accordance with the message. The communications manager1320may be configured as or otherwise support a means for receiving, from the second UE, at least one of the multiple S-SSBs.

Additionally, or alternatively, the communications manager1320may support wireless communication at a first UE in accordance with examples as disclosed herein. For example, the communications manager1320may be configured as or otherwise support a means for identifying a reference frequency position of a reference S-SSB in a sidelink BWP. The communications manager1320may be configured as or otherwise support a means for transmitting, to a second UE, the reference S-SSB in accordance with the reference frequency position. The communications manager1320may be configured as or otherwise support a means for transmitting, to the second UE, one or more additional S-SSBs whose frequency positions are different from but based on the reference frequency position.

Additionally, or alternatively, the communications manager1320may support wireless communication at a first UE in accordance with examples as disclosed herein. For example, the communications manager1320may be configured as or otherwise support a means for identifying a reference frequency position of a reference S-SSB in a sidelink BWP. The communications manager1320may be configured as or otherwise support a means for receiving, from a second UE, the reference S-SSB in accordance with the reference frequency position. The communications manager1320may be configured as or otherwise support a means for receiving, from the second UE, one or more additional S-SSBs whose frequency positions are different from but based on the reference frequency position.

By including or configuring the communications manager1320in accordance with examples as described herein, the device1305(e.g., a processor controlling or otherwise coupled with the receiver1310, the transmitter1315, the communications manager1320, or a combination thereof) may support techniques for transmitting S-SSB repetitions in an unlicensed band, which may increase the signal strength of S-SSB transmissions, thereby increasing the success rates of the transmissions.

FIG.14shows a block diagram1400of a device1405that supports S-SSB transmission in an unlicensed band in accordance with one or more aspects of the present disclosure. The device1405may be an example of aspects of a device1305or a UE115as described herein. The device1405may include a receiver1410, a transmitter1415, and a communications manager1420. The device1405may also include a processor. Each of these components may be in communication with one another (e.g., via one or more buses).

The receiver1410may provide a means for receiving information such as packets, user data, control information, or any combination thereof associated with various information channels (e.g., control channels, data channels, information channels related to S-SSB transmission in an unlicensed band). Information may be passed on to other components of the device1405. The receiver1410may utilize a single antenna or a set of multiple antennas.

The transmitter1415may provide a means for transmitting signals generated by other components of the device1405. For example, the transmitter1415may transmit information such as packets, user data, control information, or any combination thereof associated with various information channels (e.g., control channels, data channels, information channels related to S-SSB transmission in an unlicensed band). In some examples, the transmitter1415may be co-located with a receiver1410in a transceiver module. The transmitter1415may utilize a single antenna or a set of multiple antennas.

The device1405, or various components thereof, may be an example of means for performing various aspects of S-SSB transmission in an unlicensed band as described herein. For example, the communications manager1420may include a message reception component1425, an LBT component1430, an S-SSB communication component1435, an S-SSB identification component1440, a monitoring component1445, a reference frequency position component1450, a reference S-SSB component1455, or any combination thereof. The communications manager1420may be an example of aspects of a communications manager1320as described herein. In some examples, the communications manager1420, or various components thereof, may be configured to perform various operations (e.g., receiving, obtaining, monitoring, outputting, transmitting) using or otherwise in cooperation with the receiver1410, the transmitter1415, or both. For example, the communications manager1420may receive information from the receiver1410, send information to the transmitter1415, or be integrated in combination with the receiver1410, the transmitter1415, or both to obtain information, output information, or perform various other operations as described herein.

The communications manager1420may support wireless communication at a first UE in accordance with examples as disclosed herein. The message reception component1425may be configured as or otherwise support a means for receiving, from a network entity, a message indicating that the first UE is to transmit multiple S-SSBs within an S-SSB period, the message also indicative of whether the multiple S-SSBs are to be transmitted back-to-back or with an offset between consecutive ones of the multiple S-SSBs. The LBT component1430may be configured as or otherwise support a means for determining one or more LBT occasions in association with the multiple S-SSBs, where a timing of the one or more LBT occasions is based on whether the multiple S-SSBs are to be transmitted back-to-back or with the offset between the consecutive ones of the multiple S-SSBs. The LBT component1430may be configured as or otherwise support a means for participating in at least one LBT procedure during the one or more LBT occasions. The S-SSB communication component1435may be configured as or otherwise support a means for transmitting, to a second UE, the multiple S-SSBs.

Additionally, or alternatively, the communications manager1420may support wireless communication at a first UE in accordance with examples as disclosed herein. The S-SSB identification component1440may be configured as or otherwise support a means for identifying, via a message, that a second UE is to transmit multiple S-SSBs within an S-SSB period, the message also indicative of whether the multiple S-SSBs are to be transmitted back-to-back or with an offset between consecutive ones of the multiple S-SSBs. The monitoring component1445may be configured as or otherwise support a means for monitoring for the multiple S-SSBs transmitted by the second UE in accordance with the message. The S-SSB communication component1435may be configured as or otherwise support a means for receiving, from the second UE, at least one of the multiple S-SSBs.

Additionally, or alternatively, the communications manager1420may support wireless communication at a first UE in accordance with examples as disclosed herein. The reference frequency position component1450may be configured as or otherwise support a means for identifying a reference frequency position of a reference S-SSB in a sidelink BWP. The reference S-SSB component1455may be configured as or otherwise support a means for transmitting, to a second UE, the reference S-SSB in accordance with the reference frequency position. The S-SSB communication component1435may be configured as or otherwise support a means for transmitting, to the second UE, one or more additional S-SSBs whose frequency positions are different from but based on the reference frequency position.

Additionally, or alternatively, the communications manager1420may support wireless communication at a first UE in accordance with examples as disclosed herein. The reference frequency position component1450may be configured as or otherwise support a means for identifying a reference frequency position of a reference S-SSB in a sidelink BWP. The reference S-SSB component1455may be configured as or otherwise support a means for receiving, from a second UE, the reference S-SSB in accordance with the reference frequency position. The S-SSB communication component1435may be configured as or otherwise support a means for receiving, from the second UE, one or more additional S-SSBs whose frequency positions are different from but based on the reference frequency position.

FIG.15shows a block diagram1500of a communications manager1520that supports S-SSB transmission in an unlicensed band in accordance with one or more aspects of the present disclosure. The communications manager1520may be an example of aspects of a communications manager1320, a communications manager1420, or both, as described herein. The communications manager1520, or various components thereof, may be an example of means for performing various aspects of S-SSB transmission in an unlicensed band as described herein. For example, the communications manager1520may include a message reception component1525, an LBT component1530, an S-SSB communication component1535, an S-SSB identification component1540, a monitoring component1545, a reference frequency position component1550, a reference S-SSB component1555, a sidelink configuration component1560, a bandwidth extension component1565, a power determination component1570, an LBT determination component1575, a signaling reception component1580, or any combination thereof. Each of these components may communicate, directly or indirectly, with one another (e.g., via one or more buses).

The communications manager1520may support wireless communication at a first UE in accordance with examples as disclosed herein. The message reception component1525may be configured as or otherwise support a means for receiving, from a network entity, a message indicating that the first UE is to transmit multiple S-SSBs within an S-SSB period, the message also indicative of whether the multiple S-SSBs are to be transmitted back-to-back or with an offset between consecutive ones of the multiple S-SSBs. The LBT component1530may be configured as or otherwise support a means for determining one or more LBT occasions in association with the multiple S-SSBs, where a timing of the one or more LBT occasions is based on whether the multiple S-SSBs are to be transmitted back-to-back or with the offset between the consecutive ones of the multiple S-SSBs. In some examples, the LBT component1530may be configured as or otherwise support a means for participating in at least one LBT procedure during the one or more LBT occasions. The S-SSB communication component1535may be configured as or otherwise support a means for transmitting, to a second UE, the multiple S-SSBs.

In some examples, to support receiving the message indicating that the first UE is to transmit multiple S-SSBs within the S-SSB period, the sidelink configuration component1560may be configured as or otherwise support a means for receiving an indication of a sidelink configuration, the sidelink configuration indicating that the first UE is to transmit the multiple S-SSBs within an S-SSB instance of the S-SSB period.

In some examples, the sidelink configuration component1560may be configured as or otherwise support a means for determining, based at least on an RRC parameter of the sidelink configuration, a determined quantity of the multiple S-SSBs for inclusion within the S-SSB instance.

In some examples, the sidelink configuration defines an interval between starting times of consecutive S-SSB instances, where the interval allows for the multiple S-SSBs to be included within a first S-SSB instance without overlapping a second S-SSB instance of the consecutive S-SSB instances.

In some examples, the sidelink configuration indicating that the multiple S-SSBs are to transmitted within the S-SSB instance is indicative that the multiple S-SSBs are to be transmitted back-to-back.

In some examples, to support receiving the message indicating that the first UE is to transmit multiple S-SSBs within the S-SSB period, the sidelink configuration component1560may be configured as or otherwise support a means for receiving an indication of a sidelink configuration, the sidelink configuration indicating that the first UE is to transmit the multiple S-SSBs within a corresponding multiple S-SSB instances of the S-SSB period.

In some examples, to support transmitting the multiple S-SSBs, the S-SSB communication component1535may be configured as or otherwise support a means for transmitting the multiple S-SSBs back-to-back within the S-SSB period.

In some examples, to support determining the one or more LBT occasions, the LBT determination component1575may be configured as or otherwise support a means for identifying a first LBT occasion associated with a temporally first of the multiple S-SSBs, where the at least one LBT occasion during which the first UE participates in the listen-to-talk procedure is the first LBT occasion, the transmitting of the multiple S-SSBs based on the first UE participating in the LBT procedure during only the first LBT occasion.

In some examples, to support determining the one or more LBT occasions, the LBT determination component1575may be configured as or otherwise support a means for identifying a first LBT occasion associated with a temporally first of the multiple S-SSBs, where the first UE participates in an unsuccessful LBT procedure during the first LBT occasion. In some examples, to support determining the one or more LBT occasions, the LBT determination component1575may be configured as or otherwise support a means for identifying one or more additional LBT occasions that temporally follow the first LBT occasion, where the at least one LBT occasion during which the first UE participates in the listen-to-talk procedure includes one of the one or more additional LBT occasions after also participating in the unsuccessful LBT procedure.

In some examples, the S-SSB communication component1535may be configured as or otherwise support a means for determining, based on the message, a quantity of the multiple S-SSBs for transmission, where less than the quantity is transmitted based on the first UE participating in the unsuccessful LBT procedure during the first LBT occasion.

In some examples, the S-SSB communication component1535may be configured as or otherwise support a means for determining that one or more AGC or gap symbols are during a transmission interval for the multiple S-SSBs. In some examples, the S-SSB communication component1535may be configured as or otherwise support a means for transmitting a sidelink broadcast channel during the one or more AGC or gap symbols based on the multiple S-SSBs being transmitted back-to-back.

In some examples, to support transmitting the sidelink broadcast channel, the S-SSB communication component1535may be configured as or otherwise support a means for transmitting the sidelink broadcast channel during a gap symbol by including resource elements of the gap symbol in rate matching or by duplicating a previously transmitted sidelink broadcast channel.

In some examples, to support transmitting the multiple S-SSBs, the S-SSB communication component1535may be configured as or otherwise support a means for transmitting the multiple S-SSBs with the offset between consecutive ones of the multiple S-SSBs.

In some examples, to support determining the one or more LBT occasions, the LBT determination component1575may be configured as or otherwise support a means for identifying a set of multiple LBT occasions, each associated with one of the multiple S-SSBs, the transmitting of the multiple S-SSBs based on the first UE participating in the LBT procedure during multiple ones of the set of multiple LBT occasions.

In some examples, the bandwidth extension component1565may be configured as or otherwise support a means for extending a first bandwidth of a PSS of an S-SSB, a second bandwidth of an SSS of one or more of the multiple S-SSBs, and a third bandwidth of a sidelink broadcast channel of the S-SSB within a sidelink BWP based on lowering a coding rate, increasing a payload size, or both.

In some examples, the power determination component1570may be configured as or otherwise support a means for determining a power for transmitting the one or more S-SSBs or a sidelink broadcast channel based on a quantity of resource blocks for transmitting the one or more S-SSBs or the sidelink broadcast channel for an identified sub-carrier spacing configuration.

Additionally, or alternatively, the communications manager1520may support wireless communication at a first UE in accordance with examples as disclosed herein. The S-SSB identification component1540may be configured as or otherwise support a means for identifying, via a message, that a second UE is to transmit multiple S-SSBs within an S-SSB period, the message also indicative of whether the multiple S-SSBs are to be transmitted back-to-back or with an offset between consecutive ones of the multiple S-SSBs. The monitoring component1545may be configured as or otherwise support a means for monitoring for the multiple S-SSBs transmitted by the second UE in accordance with the message. In some examples, the S-SSB communication component1535may be configured as or otherwise support a means for receiving, from the second UE, at least one of the multiple S-SSBs.

In some examples, to support identifying that the second UE is to transmit multiple S-SSBs within the S-SSB period, the sidelink configuration component1560may be configured as or otherwise support a means for receiving an indication of a sidelink configuration, the sidelink configuration indicating that the second UE is to transmit the multiple S-SSBs within an S-SSB instance of the S-SSB period.

In some examples, the sidelink configuration defines an interval between starting times of consecutive S-SSB instances, where the interval allows for the multiple S-SSBs to be included within a first S-SSB instance without overlapping a second S-SSB instance of the consecutive S-SSB instances.

In some examples, the sidelink configuration indicating that the multiple S-SSBs are to transmitted within the S-SSB instance is indicative that the multiple S-SSBs are to be transmitted back-to-back.

In some examples, to support identifying that the second UE is to transmit multiple S-SSBs within the S-SSB period, the sidelink configuration component1560may be configured as or otherwise support a means for receiving an indication of a sidelink configuration, the sidelink configuration indicating that the second UE is to transmit the multiple S-SSBs within a corresponding multiple S-SSB instances of the S-SSB period.

In some examples, to support receiving at least one of the multiple S-SSBs, the S-SSB communication component1535may be configured as or otherwise support a means for receiving a set of multiple the multiple S-SSBs back-to-back within the S-SSB period.

In some examples, the S-SSB communication component1535may be configured as or otherwise support a means for receiving a sidelink broadcast channel during one or more AGC or gap symbols based on the multiple S-SSBs being received back-to-back.

In some examples, to support receiving at least one of the multiple S-SSBs, the S-SSB communication component1535may be configured as or otherwise support a means for receiving a set of multiple the multiple S-SSBs with the offset between consecutive ones of the multiple S-SSBs.

In some examples, to support receiving at least one of the multiple S-SSBs, the S-SSB communication component1535may be configured as or otherwise support a means for blind detecting for the multiple S-SSBs. In some examples, to support receiving at least one of the multiple S-SSBs, the S-SSB communication component1535may be configured as or otherwise support a means for determining that a received signal is one of the multiple S-SSBs based on a comparison of a correlation energy of the received signal with a threshold.

Additionally, or alternatively, the communications manager1520may support wireless communication at a first UE in accordance with examples as disclosed herein. The reference frequency position component1550may be configured as or otherwise support a means for identifying a reference frequency position of a reference S-SSB in a sidelink BWP. The reference S-SSB component1555may be configured as or otherwise support a means for transmitting, to a second UE, the reference S-SSB in accordance with the reference frequency position. In some examples, the S-SSB communication component1535may be configured as or otherwise support a means for transmitting, to the second UE, one or more additional S-SSBs whose frequency positions are different from but based on the reference frequency position.

In some examples, the message reception component1525may be configured as or otherwise support a means for receiving, from a network entity, a message indicating the reference frequency position of the reference S-SSB in the sidelink BWP.

In some examples, to support transmitting the one or more additional S-SSBs, the S-SSB communication component1535may be configured as or otherwise support a means for transmitting the one or more additional S-SSBs whose frequency positions are different from but based on the reference frequency position, where the one or more additional S-SSBs are continuous in frequency.

In some examples, the signaling reception component1580may be configured as or otherwise support a means for receiving, from a network entity, signaling indicating a sub-carrier spacing configuration, the sub-carrier spacing configuration indicative of a quantity of S-SSBs to be transmitted in the sidelink BWP by the first UE, the S-SSBs including the reference S-SSB and the one or more additional S-SSBs. In some examples, the signaling reception component1580may be configured as or otherwise support a means for identifying the quantity of S-SSBs to be transmitted in the sidelink BWP by the first UE based on receiving the signaling.

In some examples, the signaling reception component1580may be configured as or otherwise support a means for receiving, from a network entity, signaling indicating a quantity of S-SSBs to be transmitted in the sidelink BWP by the first UE, the S-SSBs including the reference S-SSB and the one or more additional S-SSBs.

In some examples, the S-SSB communication component1535may be configured as or otherwise support a means for identifying a quantity of S-SSBs to be transmitted in the sidelink BWP by the first UE, where the quantity of S-SSBs is pre-configured, and where the S-SSBs include the reference S-SSB and the one or more additional S-SSBs.

In some examples, to support transmitting the one or more additional S-SSBs, the S-SSB communication component1535may be configured as or otherwise support a means for transmitting the one or more additional S-SSBs whose frequency positions are different from but based on the reference frequency position, where the one or more additional S-SSBs are at least partially discontinuous in frequency.

In some examples, a quantity of S-SSBs is based on a mode of the first UE, where the mode includes a low power indoor mode or a very low power mode, and where the S-SSBs include the reference S-SSBs and the one or more additional S-SSBs.

In some examples, the S-SSB communication component1535may be configured as or otherwise support a means for receiving, from a network entity, signaling indicating a bitmap indicative of a quantity of S-SSBs to be transmitted in the sidelink BWP by the first UE, the S-SSBs including the reference S-SSB and the one or more additional S-SSBs, and where a first bit of the bitmap corresponds to the reference S-SSB.

In some examples, the bandwidth extension component1565may be configured as or otherwise support a means for extending a first bandwidth of a PSS of an S-SSB, a second bandwidth of an SSS of one or more multiple S-SSBs, and a third bandwidth of a sidelink broadcast channel of the S-SSB within a sidelink BWP based on lowering a coding rate, increasing a payload size, or both.

In some examples, the power determination component1570may be configured as or otherwise support a means for determining a power for transmitting an S-SSB or a sidelink broadcast channel based on a quantity of resource blocks for transmitting the S-SSB or the sidelink broadcast channel with a sub-carrier spacing configuration.

Additionally, or alternatively, the communications manager1520may support wireless communication at a first UE in accordance with examples as disclosed herein. In some examples, the reference frequency position component1550may be configured as or otherwise support a means for identifying a reference frequency position of a reference S-SSB in a sidelink BWP. In some examples, the reference S-SSB component1555may be configured as or otherwise support a means for receiving, from a second UE, the reference S-SSB in accordance with the reference frequency position. In some examples, the S-SSB communication component1535may be configured as or otherwise support a means for receiving, from the second UE, one or more additional S-SSBs whose frequency positions are different from but based on the reference frequency position.

In some examples, the message reception component1525may be configured as or otherwise support a means for receiving, from a network entity, a message indicating the reference frequency position of the reference S-SSB in the sidelink BWP.

In some examples, to support receiving the one or more additional S-SSBs, the S-SSB communication component1535may be configured as or otherwise support a means for receiving the one or more additional S-SSBs whose frequency positions are different from but based on the reference frequency position, where the one or more additional S-SSBs are continuous in frequency.

In some examples, the S-SSB communication component1535may be configured as or otherwise support a means for decoding the one or more additional S-SSBs to identify pseudo-noise sequence-based scrambling added to each S-SSB of the one or more additional S-SSBs, where a pseudo-noise sequence of the pseudo-noise sequence-based scrambling is different for each S-SSB of the one or more additional S-SSBs.

In some examples, to support receiving the one or more additional S-SSBs, the S-SSB communication component1535may be configured as or otherwise support a means for receiving the one or more additional S-SSBs whose frequency positions are different from but based on the reference frequency position, where the one or more additional S-SSBs are at least partially discontinuous in frequency.

In some examples, a quantity of S-SSBs is based on a mode of the first UE, where the mode includes a low power indoor mode or a very low power mode, and where the S-SSBs include the reference S-SSBs and the one or more additional S-SSBs.

FIG.16shows a diagram of a system1600including a device1605that supports S-SSB transmission in an unlicensed band in accordance with one or more aspects of the present disclosure. The device1605may be an example of or include the components of a device1305, a device1405, or a UE115as described herein. The device1605may communicate (e.g., wirelessly) with one or more network entities105, one or more UEs115, or any combination thereof. The device1605may include components for bi-directional voice and data communications including components for transmitting and receiving communications, such as a communications manager1620, an input/output (I/O) controller1610, a transceiver1615, an antenna1625, a memory1630, code1635, and a processor1640. These components may be in electronic communication or otherwise coupled (e.g., operatively, communicatively, functionally, electronically, electrically) via one or more buses (e.g., a bus1645).

The I/O controller1610may manage input and output signals for the device1605. The I/O controller1610may also manage peripherals not integrated into the device1605. In some cases, the I/O controller1610may represent a physical connection or port to an external peripheral. In some cases, the I/O controller1610may utilize an operating system such as iOS®, ANDROID®, MS-DOS®, MS-WINDOWS®, OS/2®, UNIX®, LINUX®, or another known operating system. Additionally, or alternatively, the I/O controller1610may represent or interact with a modem, a keyboard, a mouse, a touchscreen, or a similar device. In some cases, the I/O controller1610may be implemented as part of a processor, such as the processor1640. In some cases, a user may interact with the device1605via the I/O controller1610or via hardware components controlled by the I/O controller1610.

In some cases, the device1605may include a single antenna1625. However, in some other cases, the device1605may have more than one antenna1625, which may be capable of concurrently transmitting or receiving multiple wireless transmissions. The transceiver1615may communicate bi-directionally, via the one or more antennas1625, wired, or wireless links as described herein. For example, the transceiver1615may represent a wireless transceiver and may communicate bi-directionally with another wireless transceiver. The transceiver1615may also include a modem to modulate the packets, to provide the modulated packets to one or more antennas1625for transmission, and to demodulate packets received from the one or more antennas1625. The transceiver1615, or the transceiver1615and one or more antennas1625, may be an example of a transmitter1315, a transmitter1415, a receiver1310, a receiver1410, or any combination thereof or component thereof, as described herein.

The memory1630may include random access memory (RAM) and read-only memory (ROM). The memory1630may store computer-readable, computer-executable code1635including instructions that, when executed by the processor1640, cause the device1605to perform various functions described herein. The code1635may be stored in a non-transitory computer-readable medium such as system memory or another type of memory. In some cases, the code1635may not be directly executable by the processor1640but may cause a computer (e.g., when compiled and executed) to perform functions described herein. In some cases, the memory1630may contain, among other things, a basic I/O system (BIOS) which may control basic hardware or software operation such as the interaction with peripheral components or devices.

The processor1640may include an intelligent hardware device (e.g., a general-purpose processor, a DSP, a CPU, a microcontroller, an ASIC, an FPGA, a programmable logic device, a discrete gate or transistor logic component, a discrete hardware component, or any combination thereof). In some cases, the processor1640may be configured to operate a memory array using a memory controller. In some other cases, a memory controller may be integrated into the processor1640. The processor1640may be configured to execute computer-readable instructions stored in a memory (e.g., the memory1630) to cause the device1605to perform various functions (e.g., functions or tasks supporting S-SSB transmission in an unlicensed band). For example, the device1605or a component of the device1605may include a processor1640and memory1630coupled with or to the processor1640, the processor1640and memory1630configured to perform various functions described herein.

The communications manager1620may support wireless communication at a first UE in accordance with examples as disclosed herein. For example, the communications manager1620may be configured as or otherwise support a means for receiving, from a network entity, a message indicating that the first UE is to transmit multiple S-SSBs within an S-SSB period, the message also indicative of whether the multiple S-SSBs are to be transmitted back-to-back or with an offset between consecutive ones of the multiple S-SSBs. The communications manager1620may be configured as or otherwise support a means for determining one or more LBT occasions in association with the multiple S-SSBs, where a timing of the one or more LBT occasions is based on whether the multiple S-SSBs are to be transmitted back-to-back or with the offset between the consecutive ones of the multiple S-SSBs. The communications manager1620may be configured as or otherwise support a means for participating in at least one LBT procedure during the one or more LBT occasions. The communications manager1620may be configured as or otherwise support a means for transmitting, to a second UE, the multiple S-SSBs.

Additionally, or alternatively, the communications manager1620may support wireless communication at a first UE in accordance with examples as disclosed herein. For example, the communications manager1620may be configured as or otherwise support a means for identifying, via a message, that a second UE is to transmit multiple S-SSBs within an S-SSB period, the message also indicative of whether the multiple S-SSBs are to be transmitted back-to-back or with an offset between consecutive ones of the multiple S-SSBs. The communications manager1620may be configured as or otherwise support a means for monitoring for the multiple S-SSBs transmitted by the second UE in accordance with the message. The communications manager1620may be configured as or otherwise support a means for receiving, from the second UE, at least one of the multiple S-SSBs.

Additionally, or alternatively, the communications manager1620may support wireless communication at a first UE in accordance with examples as disclosed herein. For example, the communications manager1620may be configured as or otherwise support a means for identifying a reference frequency position of a reference S-SSB in a sidelink BWP. The communications manager1620may be configured as or otherwise support a means for transmitting, to a second UE, the reference S-SSB in accordance with the reference frequency position. The communications manager1620may be configured as or otherwise support a means for transmitting, to the second UE, one or more additional S-SSBs whose frequency positions are different from but based on the reference frequency position.

Additionally, or alternatively, the communications manager1620may support wireless communication at a first UE in accordance with examples as disclosed herein. For example, the communications manager1620may be configured as or otherwise support a means for identifying a reference frequency position of a reference S-SSB in a sidelink BWP. The communications manager1620may be configured as or otherwise support a means for receiving, from a second UE, the reference S-SSB in accordance with the reference frequency position. The communications manager1620may be configured as or otherwise support a means for receiving, from the second UE, one or more additional S-SSBs whose frequency positions are different from but based on the reference frequency position.

By including or configuring the communications manager1620in accordance with examples as described herein, the device1605may support techniques for transmitting S-SSB repetitions in an unlicensed band, which may increase the signal strength of S-SSB transmissions, thereby increasing the success rates of the transmissions.

In some examples, the communications manager1620may be configured to perform various operations (e.g., receiving, monitoring, transmitting) using or otherwise in cooperation with the transceiver1615, the one or more antennas1625, or any combination thereof. Although the communications manager1620is illustrated as a separate component, in some examples, one or more functions described with reference to the communications manager1620may be supported by or performed by the processor1640, the memory1630, the code1635, or any combination thereof. For example, the code1635may include instructions executable by the processor1640to cause the device1605to perform various aspects of S-SSB transmission in an unlicensed band as described herein, or the processor1640and the memory1630may be otherwise configured to perform or support such operations.

At1705, the method may include receiving, from a network entity, a message indicating that the first UE is to transmit multiple S-SSBs within an S-SSB period, the message also indicative of whether the multiple S-SSBs are to be transmitted back-to-back or with an offset between consecutive ones of the multiple S-SSBs. The operations of1705may be performed in accordance with examples as disclosed herein. In some examples, aspects of the operations of1705may be performed by a message reception component1525as described with reference toFIG.15.

At1710, the method may include determining one or more LBT occasions in association with the multiple S-SSBs, where a timing of the one or more LBT occasions is based on whether the multiple S-SSBs are to be transmitted back-to-back or with the offset between the consecutive ones of the multiple S-SSBs. The operations of1710may be performed in accordance with examples as disclosed herein. In some examples, aspects of the operations of1710may be performed by an LBT component1530as described with reference toFIG.15.

At1715, the method may include participating in at least one LBT procedure during the one or more LBT occasions. The operations of1715may be performed in accordance with examples as disclosed herein. In some examples, aspects of the operations of1715may be performed by an LBT component1530as described with reference toFIG.15.

At1720, the method may include transmitting, to a second UE, the multiple S-SSBs. The operations of1720may be performed in accordance with examples as disclosed herein. In some examples, aspects of the operations of1720may be performed by an S-SSB communication component1535as described with reference toFIG.15.

At1805, the method may include receiving, from a network entity, a message indicating that the first UE is to transmit multiple S-SSBs within an S-SSB period, the message also indicative of whether the multiple S-SSBs are to be transmitted back-to-back or with an offset between consecutive ones of the multiple S-SSBs. The operations of1805may be performed in accordance with examples as disclosed herein. In some examples, aspects of the operations of1805may be performed by a message reception component1525as described with reference toFIG.15.

At1810, the method may include determining one or more LBT occasions in association with the multiple S-SSBs, where a timing of the one or more LBT occasions is based on whether the multiple S-SSBs are to be transmitted back-to-back or with the offset between the consecutive ones of the multiple S-SSBs. The operations of1810may be performed in accordance with examples as disclosed herein. In some examples, aspects of the operations of1810may be performed by an LBT component1530as described with reference toFIG.15.

At1815, the method may include participating in at least one LBT procedure during the one or more LBT occasions. The operations of1815may be performed in accordance with examples as disclosed herein. In some examples, aspects of the operations of1815may be performed by an LBT component1530as described with reference toFIG.15.

At1820, the method may include transmitting the multiple S-SSBs back-to-back within the S-SSB period. The operations of1820may be performed in accordance with examples as disclosed herein. In some examples, aspects of the operations of1820may be performed by an S-SSB communication component1535as described with reference toFIG.15.

At1905, the method may include receiving, from a network entity, a message indicating that the first UE is to transmit multiple S-SSBs within an S-SSB period, the message also indicative of whether the multiple S-SSBs are to be transmitted back-to-back or with an offset between consecutive ones of the multiple S-SSBs. The operations of1905may be performed in accordance with examples as disclosed herein. In some examples, aspects of the operations of1905may be performed by a message reception component1525as described with reference toFIG.15.

At1910, the method may include determining one or more LBT occasions in association with the multiple S-SSBs, where a timing of the one or more LBT occasions is based on whether the multiple S-SSBs are to be transmitted back-to-back or with the offset between the consecutive ones of the multiple S-SSBs. The operations of1910may be performed in accordance with examples as disclosed herein. In some examples, aspects of the operations of1910may be performed by an LBT component1530as described with reference toFIG.15.

At1915, the method may include participating in at least one LBT procedure during the one or more LBT occasions. The operations of1915may be performed in accordance with examples as disclosed herein. In some examples, aspects of the operations of1915may be performed by an LBT component1530as described with reference toFIG.15.

At1920, the method may include transmitting, to a second UE, the multiple S-SSBs. The operations of1920may be performed in accordance with examples as disclosed herein. In some examples, aspects of the operations of1920may be performed by an S-SSB communication component1535as described with reference toFIG.15.

At1925, the method may include determining that one or more AGC or gap symbols are during a transmission interval for the multiple S-SSBs. The operations of1925may be performed in accordance with examples as disclosed herein. In some examples, aspects of the operations of1925may be performed by an S-SSB communication component1535as described with reference toFIG.15.

At1930, the method may include transmitting a sidelink broadcast channel during the one or more AGC or gap symbols based on the multiple S-SSBs being transmitted back-to-back. The operations of1930may be performed in accordance with examples as disclosed herein. In some examples, aspects of the operations of1930may be performed by an S-SSB communication component1535as described with reference toFIG.15.

At2005, the method may include receiving, from a network entity, a message indicating that the first UE is to transmit multiple S-SSBs within an S-SSB period, the message also indicative of whether the multiple S-SSBs are to be transmitted back-to-back or with an offset between consecutive ones of the multiple S-SSBs. The operations of2005may be performed in accordance with examples as disclosed herein. In some examples, aspects of the operations of2005may be performed by a message reception component1525as described with reference toFIG.15.

At2010, the method may include determining one or more LBT occasions in association with the multiple S-SSBs, where a timing of the one or more LBT occasions is based on whether the multiple S-SSBs are to be transmitted back-to-back or with the offset between the consecutive ones of the multiple S-SSBs. The operations of2010may be performed in accordance with examples as disclosed herein. In some examples, aspects of the operations of2010may be performed by an LBT component1530as described with reference toFIG.15.

At2015, the method may include participating in at least one LBT procedure during the one or more LBT occasions. The operations of2015may be performed in accordance with examples as disclosed herein. In some examples, aspects of the operations of2015may be performed by an LBT component1530as described with reference toFIG.15.

At2020, the method may include transmitting, to a second UE, the multiple S-SSBs. The operations of2020may be performed in accordance with examples as disclosed herein. In some examples, aspects of the operations of2020may be performed by an S-SSB communication component1535as described with reference toFIG.15.

At2025, the method may include extending a first bandwidth of a PSS of an S-SSB, a second bandwidth of an SSS of one or more of the multiple S-SSBs, and a third bandwidth of a sidelink broadcast channel of the S-SSB within a sidelink BWP based on lowering a coding rate, increasing a payload size, or both. The operations of2025may be performed in accordance with examples as disclosed herein. In some examples, aspects of the operations of2025may be performed by a bandwidth extension component1565as described with reference toFIG.15.

At2105, the method may include receiving, from a network entity, a message indicating that the first UE is to transmit multiple S-SSBs within an S-SSB period, the message also indicative of whether the multiple S-SSBs are to be transmitted back-to-back or with an offset between consecutive ones of the multiple S-SSBs. The operations of2105may be performed in accordance with examples as disclosed herein. In some examples, aspects of the operations of2105may be performed by a message reception component1525as described with reference toFIG.15.

At2110, the method may include determining one or more LBT occasions in association with the multiple S-SSBs, where a timing of the one or more LBT occasions is based on whether the multiple S-SSBs are to be transmitted back-to-back or with the offset between the consecutive ones of the multiple S-SSBs. The operations of2110may be performed in accordance with examples as disclosed herein. In some examples, aspects of the operations of2110may be performed by an LBT component1530as described with reference toFIG.15.

At2115, the method may include participating in at least one LBT procedure during the one or more LBT occasions. The operations of2115may be performed in accordance with examples as disclosed herein. In some examples, aspects of the operations of2115may be performed by an LBT component1530as described with reference toFIG.15.

At2120, the method may include transmitting, to a second UE, the multiple S-SSBs. The operations of2120may be performed in accordance with examples as disclosed herein. In some examples, aspects of the operations of2120may be performed by an S-SSB communication component1535as described with reference toFIG.15.

At2125, the method may include determining a power for transmitting the one or more S-SSBs or a sidelink broadcast channel based on a quantity of resource blocks for transmitting the one or more S-SSBs or the sidelink broadcast channel for an identified sub-carrier spacing configuration. The operations of2125may be performed in accordance with examples as disclosed herein. In some examples, aspects of the operations of2125may be performed by a power determination component1570as described with reference toFIG.15.

At2205, the method may include identifying, via a message, that a second UE is to transmit multiple S-SSBs within an S-SSB period, the message also indicative of whether the multiple S-SSBs are to be transmitted back-to-back or with an offset between consecutive ones of the multiple S-SSBs. The operations of2205may be performed in accordance with examples as disclosed herein. In some examples, aspects of the operations of2205may be performed by an S-SSB identification component1540as described with reference toFIG.15.

At2210, the method may include monitoring for the multiple S-SSBs transmitted by the second UE in accordance with the message. The operations of2210may be performed in accordance with examples as disclosed herein. In some examples, aspects of the operations of2210may be performed by a monitoring component1545as described with reference toFIG.15.

At2215, the method may include receiving, from the second UE, at least one of the multiple S-SSBs. The operations of2215may be performed in accordance with examples as disclosed herein. In some examples, aspects of the operations of2215may be performed by an S-SSB communication component1535as described with reference toFIG.15.

At2305, the method may include identifying a reference frequency position of a reference S-SSB in a sidelink BWP. The operations of2305may be performed in accordance with examples as disclosed herein. In some examples, aspects of the operations of2305may be performed by a reference frequency position component1550as described with reference toFIG.15.

At2310, the method may include transmitting, to a second UE, the reference S-SSB in accordance with the reference frequency position. The operations of2310may be performed in accordance with examples as disclosed herein. In some examples, aspects of the operations of2310may be performed by a reference S-SSB component1555as described with reference toFIG.15.

At2315, the method may include transmitting, to the second UE, one or more additional S-SSBs whose frequency positions are different from but based on the reference frequency position. The operations of2315may be performed in accordance with examples as disclosed herein. In some examples, aspects of the operations of2315may be performed by an S-SSB communication component1535as described with reference toFIG.15.

At2405, the method may include identifying a reference frequency position of a reference S-SSB in a sidelink BWP. The operations of2405may be performed in accordance with examples as disclosed herein. In some examples, aspects of the operations of2405may be performed by a reference frequency position component1550as described with reference toFIG.15.

At2410, the method may include transmitting, to a second UE, the reference S-SSB in accordance with the reference frequency position. The operations of2410may be performed in accordance with examples as disclosed herein. In some examples, aspects of the operations of2410may be performed by a reference S-SSB component1555as described with reference toFIG.15.

At2415, the method may include transmitting the one or more additional S-SSBs whose frequency positions are different from but based on the reference frequency position, where the one or more additional S-SSBs are continuous in frequency. The operations of2415may be performed in accordance with examples as disclosed herein. In some examples, aspects of the operations of2415may be performed by an S-SSB communication component1535as described with reference toFIG.15.

At2505, the method may include identifying a reference frequency position of a reference S-SSB in a sidelink BWP. The operations of2505may be performed in accordance with examples as disclosed herein. In some examples, aspects of the operations of2505may be performed by a reference frequency position component1550as described with reference toFIG.15.

At2510, the method may include transmitting, to a second UE, the reference S-SSB in accordance with the reference frequency position. The operations of2510may be performed in accordance with examples as disclosed herein. In some examples, aspects of the operations of2510may be performed by a reference S-SSB component1555as described with reference toFIG.15.

At2515, the method may include transmitting the one or more additional S-SSBs whose frequency positions are different from but based on the reference frequency position, where the one or more additional S-SSBs are at least partially discontinuous in frequency. The operations of2515may be performed in accordance with examples as disclosed herein. In some examples, aspects of the operations of2515may be performed by an S-SSB communication component1535as described with reference toFIG.15.

At2605, the method may include identifying a reference frequency position of a reference S-SSB in a sidelink BWP. The operations of2605may be performed in accordance with examples as disclosed herein. In some examples, aspects of the operations of2605may be performed by a reference frequency position component1550as described with reference toFIG.15.

At2610, the method may include receiving, from a second UE, the reference S-SSB in accordance with the reference frequency position. The operations of2610may be performed in accordance with examples as disclosed herein. In some examples, aspects of the operations of2610may be performed by a reference S-SSB component1555as described with reference toFIG.15.

At2615, the method may include receiving, from the second UE, one or more additional S-SSBs whose frequency positions are different from but based on the reference frequency position. The operations of2615may be performed in accordance with examples as disclosed herein. In some examples, aspects of the operations of2615may be performed by an S-SSB communication component1535as described with reference toFIG.15.

Aspect 1: A method for wireless communication at a first UE, comprising: receiving, from a network entity, a message indicating that the first UE is to transmit multiple S-SSBs within an S-SSB period, the message also indicative of whether the multiple S-SSBs are to be transmitted back-to-back or with an offset between consecutive ones of the multiple S-SSBs; determining one or more LBT occasions in association with the multiple S-SSBs, wherein a timing of the one or more LBT occasions is based at least in part on whether the multiple S-SSBs are to be transmitted back-to-back or with the offset between the consecutive ones of the multiple S-SSBs; participating in at least one LBT procedure during the one or more LBT occasions; and transmitting, to a second UE, the multiple S-SSBs.

Aspect 2: The method of aspect 1, wherein receiving the message indicating that the first UE is to transmit multiple S-SSBs within the S-SSB period comprises: receiving an indication of a sidelink configuration, the sidelink configuration indicating that the first UE is to transmit the multiple S-SSBs within an S-SSB instance of the S-SSB period.

Aspect 3: The method of aspect 2, further comprising: determining, based at least on an RRC parameter of the sidelink configuration, a determined quantity of the multiple S-SSBs for inclusion within the S-SSB instance.

Aspect 4: The method of any of aspects 2 through 3, wherein the sidelink configuration defines an interval between starting times of consecutive S-SSB instances, wherein the interval allows for the multiple S-SSBs to be included within a first S-SSB instance without overlapping a second S-SSB instance of the consecutive S-SSB instances.

Aspect 5: The method of any of aspects 2 through 4, wherein the sidelink configuration indicating that the multiple S-SSBs are to transmitted within the S-SSB instance is indicative that the multiple S-SSBs are to be transmitted back-to-back.

Aspect 6: The method of any of aspects 1 through 5, wherein receiving the message indicating that the first UE is to transmit multiple S-SSBs within the S-SSB period comprises: receiving an indication of a sidelink configuration, the sidelink configuration indicating that the first UE is to transmit the multiple S-SSBs within a corresponding multiple S-SSB instances of the S-SSB period.

Aspect 7: The method of any of aspects 1 through 6, wherein transmitting the multiple S-SSBs comprises: transmitting the multiple S-SSBs back-to-back within the S-SSB period.

Aspect 8: The method of aspect 7, wherein determining the one or more LBT occasions further comprises: identifying a first LBT occasion associated with a temporally first of the multiple S-SSBs, wherein the at least one LBT occasion during which the first UE participates in the listen-to-talk procedure is the first LBT occasion, the transmitting of the multiple S-SSBs based at least in part on the first UE participating in the LBT procedure during only the first LBT occasion.

Aspect 9: The method of any of aspects 7 through 8, wherein determining the one or more LBT occasions further comprises: identifying a first LBT occasion associated with a temporally first of the multiple S-SSBs, wherein the first UE participates in an unsuccessful LBT procedure during the first LBT occasion; and identifying one or more additional LBT occasions that temporally follow the first LBT occasion, wherein the at least one LBT occasion during which the first UE participates in the listen-to-talk procedure includes one of the one or more additional LBT occasions after also participating in the unsuccessful LBT procedure.

Aspect 10: The method of aspect 9, further comprising: determining, based at least in part on the message, a quantity of the multiple S-SSBs for transmission, wherein less than the quantity is transmitted based at least in part on the first UE participating in the unsuccessful LBT procedure during the first LBT occasion.

Aspect 11: The method of any of aspects 7 through 10, further comprising: determining that one or more AGC or gap symbols are during a transmission interval for the multiple S-SSBs; and transmitting a sidelink broadcast channel during the one or more AGC or gap symbols based at least in part on the multiple S-SSBs being transmitted back-to-back.

Aspect 12: The method of aspect 11, wherein transmitting the sidelink broadcast channel comprises: transmitting the sidelink broadcast channel during a gap symbol by including resource elements of the gap symbol in rate matching or by duplicating a previously transmitted sidelink broadcast channel.

Aspect 13: The method of any of aspects 1 through 12, wherein transmitting the multiple S-SSBs comprises: transmitting the multiple S-SSBs with the offset between consecutive ones of the multiple S-SSBs.

Aspect 14: The method of aspect 13, wherein determining the one or more LBT occasions further comprises: identifying a plurality of LBT occasions, each associated with one of the multiple S-SSBs, the transmitting of the multiple S-SSBs based at least in part on the first UE participating in the LBT procedure during multiple ones of the plurality of LBT occasions.

Aspect 15: The method of any of aspects 1 through 14, further comprising: extending a first bandwidth of a PSS of an S-SSB, a second bandwidth of an SSS of one or more of the multiple S-SSBs, and a third bandwidth of a sidelink broadcast channel of the S-SSB within a sidelink BWP based at least in part on lowering a coding rate, increasing a payload size, or both.

Aspect 16: The method of any of aspects 1 through 15, further comprising: determining a power for transmitting the one or more S-SSBs or a sidelink broadcast channel based at least in part on a quantity of resource blocks for transmitting the one or more S-SSBs or the sidelink broadcast channel for an identified sub-carrier spacing configuration.

Aspect 17: A method for wireless communication at a first UE, comprising: identifying, via a message, that a second UE is to transmit multiple S-SSBs within an S-SSB period, the message also indicative of whether the multiple S-SSBs are to be transmitted back-to-back or with an offset between consecutive ones of the multiple S-SSBs; monitoring for the multiple S-SSBs transmitted by the second UE in accordance with the message; and receiving, from the second UE, at least one of the multiple S-SSBs.

Aspect 18: The method of aspect 17, wherein identifying that the second UE is to transmit multiple S-SSBs within the S-SSB period comprises: receiving an indication of a sidelink configuration, the sidelink configuration indicating that the second UE is to transmit the multiple S-SSBs within an S-SSB instance of the S-SSB period.

Aspect 19: The method of aspect 18, wherein the sidelink configuration defines an interval between starting times of consecutive S-SSB instances, wherein the interval allows for the multiple S-SSBs to be included within a first S-SSB instance without overlapping a second S-SSB instance of the consecutive S-SSB instances.

Aspect 20: The method of any of aspects 18 through 19, wherein the sidelink configuration indicating that the multiple S-SSBs are to transmitted within the S-SSB instance is indicative that the multiple S-SSBs are to be transmitted back-to-back.

Aspect 21: The method of any of aspects 17 through 20, wherein identifying that the second UE is to transmit multiple S-SSBs within the S-SSB period comprises: receiving an indication of a sidelink configuration, the sidelink configuration indicating that the second UE is to transmit the multiple S-SSBs within a corresponding multiple S-SSB instances of the S-SSB period.

Aspect 22: The method of any of aspects 17 through 21, wherein receiving at least one of the multiple S-SSBs comprises: receiving a plurality of the multiple S-SSBs back-to-back within the S-SSB period.

Aspect 23: The method of aspect 22, further comprising: receiving a sidelink broadcast channel during one or more AGC or gap symbols based at least in part on the multiple S-SSBs being received back-to-back.

Aspect 24: The method of any of aspects 17 through 23, wherein receiving at least one of the multiple S-SSBs comprises: receiving a plurality of the multiple S-SSBs with the offset between consecutive ones of the multiple S-SSBs.

Aspect 25: The method of any of aspects 17 through 24, wherein receiving at least one of the multiple S-SSBs comprises: blind detecting for the multiple S-SSBs; and determining that a received signal is one of the multiple S-SSBs based at least in part on a comparison of a correlation energy of the received signal with a threshold.

Aspect 26: A method for wireless communication at a first UE, comprising: identifying a reference frequency position of a reference S-SSB in a sidelink BWP; transmitting, to a second UE, the reference S-SSB in accordance with the reference frequency position; and transmitting, to the second UE, one or more additional S-SSBs whose frequency positions are different from but based at least in part on the reference frequency position.

Aspect 27: The method of aspect 26, further comprising: receiving, from a network entity, a message indicating the reference frequency position of the reference S-SSB in the sidelink BWP.

Aspect 28: The method of any of aspects 26 through 27, wherein transmitting the one or more additional S-SSBs comprises: transmitting the one or more additional S-SSBs whose frequency positions are different from but based at least in part on the reference frequency position, wherein the one or more additional S-SSBs are continuous in frequency.

Aspect 29: The method of aspect 28, further comprising: receiving, from a network entity, signaling indicating a sub-carrier spacing configuration, the sub-carrier spacing configuration indicative of a quantity of S-SSBs to be transmitted in the sidelink BWP by the first UE, the S-SSBs comprising the reference S-SSB and the one or more additional S-SSBs; and identifying the quantity of S-SSBs to be transmitted in the sidelink BWP by the first UE based at least in part on receiving the signaling.

Aspect 30: The method of any of aspects 28 through 29, further comprising: receiving, from a network entity, signaling indicating a quantity of S-SSBs to be transmitted in the sidelink BWP by the first UE, the S-SSBs comprising the reference S-SSB and the one or more additional S-SSBs.

Aspect 31: The method of any of aspects 28 through 30, further comprising: identifying a quantity of S-SSBs to be transmitted in the sidelink BWP by the first UE, wherein the quantity of S-SSBs is pre-configured, and wherein the S-SSBs comprise the reference S-SSB and the one or more additional S-SSBs.

Aspect 32: The method of any of aspects 26 through 31, wherein transmitting the one or more additional S-SSBs comprises: transmitting the one or more additional S-SSBs whose frequency positions are different from but based at least in part on the reference frequency position, wherein the one or more additional S-SSBs are at least partially discontinuous in frequency.

Aspect 33: The method of aspect 32, wherein a quantity of S-SSBs is based at least in part on a mode of the first UE, wherein the mode comprises a low power indoor mode or a very low power mode, and wherein the S-SSBs comprise the reference S-SSBs and the one or more additional S-SSBs.

Aspect 34: The method of any of aspects 32 through 33, further comprising: receiving, from a network entity, signaling indicating a bitmap indicative of a quantity of S-SSBs to be transmitted in the sidelink BWP by the first UE, the S-SSBs comprising the reference S-SSB and the one or more additional S-SSBs, and wherein a first bit of the bitmap corresponds to the reference S-SSB.

Aspect 35: The method of any of aspects 26 through 34, further comprising: extending a first bandwidth of a PSS of an S-SSB, a second bandwidth of an SSS of one or more multiple S-SSBs, and a third bandwidth of a sidelink broadcast channel of the S-SSB within a sidelink BWP based at least in part on lowering a coding rate, increasing a payload size, or both.

Aspect 36: The method of any of aspects 26 through 35, further comprising: determining a power for transmitting an S-SSB or a sidelink broadcast channel based at least in part on a quantity of resource blocks for transmitting the S-SSB or the sidelink broadcast channel with a sub-carrier spacing configuration.

Aspect 37: A method for wireless communication at a first UE, comprising: identifying a reference frequency position of a reference S-SSB in a sidelink BWP; receiving, from a second UE, the reference S-SSB in accordance with the reference frequency position; and receiving, from the second UE, one or more additional S-SSBs whose frequency positions are different from but based at least in part on the reference frequency position.

Aspect 38: The method of aspect 37, further comprising: receiving, from a network entity, a message indicating the reference frequency position of the reference S-SSB in the sidelink BWP.

Aspect 39: The method of any of aspects 37 through 38, wherein receiving the one or more additional S-SSBs comprises: receiving the one or more additional S-SSBs whose frequency positions are different from but based at least in part on the reference frequency position, wherein the one or more additional S-SSBs are continuous in frequency.

Aspect 40: The method of aspect 39, further comprising: decoding the one or more additional S-SSBs to identify pseudo-noise sequence-based scrambling added to each S-SSB of the one or more additional S-SSBs, wherein a pseudo-noise sequence of the pseudo-noise sequence-based scrambling is different for each S-SSB of the one or more additional S-SSBs.

Aspect 41: The method of any of aspects 37 through 40, wherein receiving the one or more additional S-SSBs comprises: receiving the one or more additional S-SSBs whose frequency positions are different from but based at least in part on the reference frequency position, wherein the one or more additional S-SSBs are at least partially discontinuous in frequency.

Aspect 42: The method of aspect 41, wherein a quantity of S-SSBs is based at least in part on a mode of the first UE, wherein the mode comprises a low power indoor mode or a very low power mode, and wherein the S-SSBs comprise the reference S-SSBs and the one or more additional S-SSBs.

Aspect 47: An apparatus for wireless communication at a first UE, comprising at least one means for performing a method of any of aspects 17 through 25.

Aspect 50: An apparatus for wireless communication at a first UE, comprising at least one means for performing a method of any of aspects 26 through 36.

Aspect 51: A non-transitory computer-readable medium storing code for wireless communication at a first UE, the code comprising instructions executable by a processor to perform a method of any of aspects 26 through 36.

Aspect 53: An apparatus for wireless communication at a first UE, comprising at least one means for performing a method of any of aspects 37 through 42.

The term “determine” or “determining” encompasses a variety of actions and, therefore, “determining” can include calculating, computing, processing, deriving, investigating, looking up (such as via looking up in a table, a database or another data structure), ascertaining and the like. Also, “determining” can include receiving (such as receiving information), accessing (such as accessing data in a memory) and the like. Also, “determining” can include resolving, obtaining, selecting, choosing, establishing and other such similar actions.