Enhancement of psfch for sidelink operations on unlicensed spectrum

Abstract

One aspect of the present disclosure relates to a method including: receiving control signaling that configures a sidelink transmission structure and one or more pathloss-based power control parameters for a physical sidelink feedback channel (PSFCH) transmission; determining a number of physical resource blocks (PRBs) for the PSFCH transmission based at least in part on the sidelink transmission structure; determining a transmission power for at least a subset of the PRBs based at least on the one or more pathloss-based power control parameters; and transmitting the PSFCH transmission via the subset of the PRBs using the determined transmission power.

Description

Attorney Docket No. 56990-0008WO1 / P65021WO1 ENHANCEMENT OF PSFCH FOR SIDELINK OPERATIONS ON UNLICENSED SPECTRUM CROSS-REFERENCE TO RELATED APPLICATIONS

[0001] This application claims the benefit of U.S. Provisional Patent Application No. 63 / 547,321, filed November 3, 2023, the entirety of which is incorporated herein by reference. BACKGROUND

[0002] Wireless communication networks provide integrated communication platforms and telecommunication services to wireless user devices. Example telecommunication services include telephony, data (e.g., voice, audio, and / or video data), messaging, and / or other services. The wireless communication networks have wireless access nodes that exchange wireless signals with the wireless user devices using wireless network protocols, such as protocols described in various telecommunication standards promulgated by the Third Generation Partnership Project (3GPP). Example wireless communication networks include time division multiple access (TDMA) networks, frequency-division multiple access (FDMA) networks, orthogonal frequency-division multiple access (OFDMA) networks, Long Term Evolution (LTE), and Fifth Generation New Radio (5G NR). The wireless communication networks facilitate mobile broadband service using technologies such as OFDM, multiple input multiple output (MIMO), advanced channel coding, massive MIMO, beamforming, and / or other features.Attorney Docket No. 56990-0008WO1 / P65021WO1 SUMMARY

[0003] This disclosure pertains to power control schemes for physical sidelink feedback channel (PSFCH) transmissions. In particular, the power control for PSFCH transmissions can be based on a number of physical resource blocks for transmitting PSFCH.

[0004] In accordance with one aspect of the present disclosure, a method performed by a user equipment (UE) to communicate with another UE using a sidelink in an unlicensed spectrum, the method including: determining a number of physical resource blocks for a physical shared feedback channel (PSFCH) transmission; and determining a PSFCH transmission power for sending the PSFCH transmission on the physical resource blocks.

[0005] In some implementations, the PSFCH transmission power is determined as:where PPSFCH,one is the power for transmitting dedicated PRBs for one PSFCH transmission, PO,PSFCHis a (pre-)configured value of nominal power defined by dl-P0-PSFCH set in a sidelink power control field, K3is the number of physical resource blocks for the PSFCH transmission, αPSFCH is a (pre-)configured value for pathloss defined by dl-alpha-PSFCH set in a sidelink power control field µ is the numerology of the sidelink and PL is the downlink pathloss.

[0006] Some implementations include determining that the PSFCH transmission power on dedicated PRBs should be adjusted to remain within a predetermined power spectral density value; and changing the determined PSFCH transmission power on dedicated PRBs based on the predetermined power spectral density limit.

[0007] In some implementations, determining that the PSFCH transmission power should be adjusted includes determining that !"#$%&,. / (D 1234567E9:B FGH I 12JKLM.

[0008] In some implementations, changing the determined PSFCH transmission power on dedicated PRBs includes changing the determined PSFCH transmission power to: 1234567E9:B FGH 012 dBm.

[0009] In some implementations, the power spectral density limit is 10 dBm or 17 dBm.

[0010] Some implementations include determining that a first dedicated physical resource block for transmitting PSFCH is adjacent to a second dedicated physical resource block forAttorney Docket No. 56990-0008WO1 / P65021WO1 transmitting another PSFCH by less than 1 megahertz; dropping a dedicated physical resource block for transmitting PSFCH with a lowest priority.

[0011] Some implementations include dropping a dedicated physical resource block for transmitting PSFCH until !"#$%&,. / (D 1234567E9:B FGH 01234567ECNH is less than 10 dBm.

[0012] Some implementations include determining a temporal transmission power of a common interlace for PSFCH transmission aswhere <>"?#$,)%.&PP. / is a number of physical resource blocks of the common interlace per RB set, R is a number of resource block sets for common interlace transmission, and β is a (pre- )configured offset between a power value of the common interlace and the transmission power of the dedicated physical resource blocks for PSFCH transmission.

[0013] In some implementations, <>"?#$,)%.&PP. / is 10 physical resource blocks or a minimum number of physical resource blocks per interlace in a resource pool or sidelink bandwidth part.

[0014] E In some implementations, <>"?#$,)%.&PP. / is 11 physical resource blocks or a maximum number of physical resource blocks per interlace in a resource pool or sidelink bandwidth part.

[0015] In some implementations, <>"?#$,)%.&PP. / includes a (pre-)configured number of physical resource blocks.

[0016] In some implementations, <>"?#$,)%.&PP. / includes a number of physical resource blocks based on a (pre-)configured interlace index of the common interlace.

[0017] Some implementations include identifying one or more PSFCH for transmission based on one or more of user equipment capabilities and total transmit power limit.

[0018] Some implementations include, for a PSFCH transmission associated with a physical sidelink shared channel or physical sidelink control channel transmission, where one physical sidelink shared channel or physical sidelink control channel transmission is performed over multiple resource block sets, then the PSFCH transmission includes one PSFCH transmission per resource block set for each physical sidelink shared channel or physical sidelink control channel transmission.

[0019] Some implementations include determining a number (M) of resource blocks in the common interlace that are to be transmitted after each dedicated physical resource block forAttorney Docket No. 56990-0008WO1 / P65021WO1 PSFCH transmission; and determining a transmission power for the M resource blocks in the common interlace aswhere M is counted over multiple resource block sets of the resource pool and overs skipped physical resource blocks that are skipped because of being within 1 MHz of another physical resource block for PSFCH transmission.

[0020] In some implementations, the PSFCH transmission power is determined as:where !"#$%&,. / (is the transmit power of the dedicated interlace for one PSFCH transmission, <>"?#$%&is a number of PRBs reserved for PSFCH transmission, PO,PSFCH is a value of dl-P0- PSFCH, A"#$%&is a value of dl-Alpha-PSFCH if provided; else A"#$%&is 1, µ is the numerology of the sidelink, and PL is the downlink pathloss.

[0021] In some implementations, <ZU[VWXYis a (pre-)configured reference number of PRBs of one interlace.

[0022] In some implementations, <ZU[VWXYincludes 10 or 11 PRBs.

[0023] A non-transitory computer storage medium encoded with instructions that, when executed by one or more computers, can cause the one or more computers to perform the operations of any preceding claim or described herein.

[0024] A user equipment (UE) can include one or more processors and one or more storage devices on which are stored instructions that are operable, when executed by the one or more computers, to cause the one or more computers to perform the method of any of claims 1 to 16.

[0025] A UE can include one or more processors and one or more storage devices on which are stored instructions that are operable, when executed by the one or more computers, to cause the one or more processors to perform one or more operations described in this specification.

[0026] The previously-described examples are implementable using a computer-implemented method; a non-transitory, computer-readable medium storing computer-readable instructions to perform the computer-implemented method; and a computer system including a computer memory interoperably coupled with a hardware processor configured to perform the computer- implemented method or the instructions stored on the non-transitory, computer-readable medium.Attorney Docket No. 56990-0008WO1 / P65021WO1

[0027] A system, e.g., a base station, or an apparatus including one or more baseband processors, and so forth, can be configured to perform particular operations or actions by virtue of having software, firmware, hardware, or a combination of them installed on the system that in operation causes or cause the system to perform the actions. The operations or actions performed either by the system can include the operations described herein.

[0028] The details of one or more embodiments of these systems and methods are set forth in the accompanying drawings and the description below. Other features, objects, and advantages of these systems and methods will be apparent from the description and drawings, and from the claims.Attorney Docket No. 56990-0008WO1 / P65021WO1 BRIEF DESCRIPTION OF THE FIGURES

[0029] FIG. 1A and FIG. 1B each illustrate example slots that include Physical Sidelink Feedback Channel (PSFCH) occasions, according to some implementations.

[0030] FIG.2A illustrates physical resources of a sidelink slot that includes a PSFCH occasion, according to some implementations.

[0031] FIG. 2B illustrates physical resources of a sidelink slot that does not include a PSFCH occasion, according to some implementations.

[0032] FIGS. 3A-C illustrate example transmission schemes for sidelink synchronization signal blocks (S-SSB) in accordance with some implementations of the present disclosure.

[0033] FIG. 4 illustrates an example communication system that includes sidelink communications, according to some implementations.

[0034] FIG. 5 is a schematic diagram illustrating an example of two dedicated interlaces for transmitting PSFCH in accordance with some implementations of the present disclosure.

[0035] FIG. 6 is a schematic diagram illustrating an example of a common interlace and two sets of dedicated physical resource blocks for transmitting PSFCH in accordance with some implementations of the present disclosure.

[0036] FIGs. 7A and 7B are process flow diagrams of methods for setting power control for PSFCH transmissions in accordance with some implementations of the present disclosure.

[0037] FIG. 8 is a schematic diagram illustrating the association of PSFCH between two PSSCH or PSCCH transmissions sent over different resource block sets in accordance with some implementations of the present disclosure.

[0038] FIG.9 is a schematic diagram illustrating monitoring of received PSFCH transmissions in accordance with some implementations of the present disclosure.

[0039] FIG. 10 is a schematic diagram illustrating support for multiple consecutive slot transmission in mode 1 in accordance with some implementations of the present disclosure.

[0040] FIG. 11 illustrates an example user equipment (UE), according to some implementations.

[0041] FIG. 12 illustrates an example access node, according to some implementations.Attorney Docket No. 56990-0008WO1 / P65021WO1 DETAILED DESCRIPTION

[0042] In some wireless communications systems, a first user equipment (UE) may receive a physical sidelink shared channel (PSSCH) transmission or a physical sidelink control channel (PSCCH) transmission from a second UE. In turn, the first UE may transmit a physical sidelink feedback channel (PSFCH) transmission containing hybrid automatic repeat request (HARQ) acknowledgement (HARQ-ACK) feedback for the PSSCH or PSCCH transmission. In some implementations, the first UE may use a common interlace pattern or a dedicated interlace pattern for the PSFCH transmission. With the common interlace pattern, the first UE may use a combination of common physical resource blocks (PRBs) and dedicated PRBs for the PSFCH transmission. With the dedicated interlace pattern, the first UE may use only dedicated PRBs for the PSFCH transmission. In some cases, however, it may be unclear how to distribute transmit power amongst the various PRBs of the PSFCH transmission.

[0043] In accordance with aspects of the present disclosure, a UE may receive radio resource control (RRC) signaling that configures a sidelink transmission structure (e.g., dedicated interlace or common interlace) for a PSFCH transmission. The RRC signaling may also indicate one or more pathloss-based power control parameters (such as dl-P0-PSFCH and dl- Alpha-PSFCH) to use for the PSFCH transmission. In turn, the UE may determine a number of PRBs (\"#$%&,. / () and a transmit power (!"#$%&,. / () for the PSFCH transmission based on the RRC signaling. The transmit power may be applicable to some or all of the PRBs allocated for the PSFCH transmission. Accordingly, the UE may transmit the PSFCH transmission via the corresponding PRBs using the determined transmit power.

[0044] FIG. 1A and FIG. 1B illustrates example sidelink slots 100, 110 that include PSFCH occasions, according to some implementations. The PSFCH occasions can occur periodically (e.g., in every other slot), as shown in FIG. 1A, or can occur in every slot, as shown in FIG. 1B. Each PSFCH occasion can be used by a receiving UE to transmit feedback, e.g., acknowledgement (ACK) or negative acknowledgement (NACK), related to a preceding sidelink transmission, e.g., a PSSCH or PSCCH transmission. As an example configuration of sidelink slots 100 in which PSFCH occasions occur periodically, a PSFCH occasion 102 can carry feedback related to a PSSCH / PSCCH transmission 104 that occurred in two slots before the slot of the PSFCH occasion 102. As another example configuration of sidelink slots 110 in which PSFCH occasions occur in every slot, a PSFCH occasion 112 can still carry feedback related to a PSSCH / PSCCH transmission 114 that occurred in two slots before the slot of theAttorney Docket No. 56990-0008WO1 / P65021WO1 PSFCH occasion 112. However, in some instances, not all scheduled PSFCH occasions are used. For example, a receiving UE may not have feedback to transmit on the PSFCH, thereby leaving the PSFCH empty.

[0045] This disclosure generally relates to sidelink on unlicensed spectrum for both mode 1 and mode 2, where Uu interface operation for mode 1 is limited to licensed spectrum. Specifically, this disclosure describes systems and methods for supporting sidelink communications on an unlicensed spectrum. Among other things, this disclosure describes systems and methods for (1) power control for PSFCH transmissions; (2) designs for PSFCH- like sequences to maintain COT; (3) UE behavior for transmitting or receiving PSFCH for PSSCH multi-consecutive slot (MCSt) transmissions; and (4) Support MCSt in mode 1 resource allocation.

[0046] Channel access mechanisms from NR-U can be reused for sidelink unlicensed operation. For sidelink operations, the applicability of sidelink resource reservation from Rel- 16 / Rel-17 is accessed for sidelink unlicensed operation within the boundaries of unlicensed channel access mechanism and operation.

[0047] One of the features being developed for the latest generation of wireless communication systems is sidelink communications on an unlicensed spectrum (SL-U). The unlicensed spectrum refers to a frequency band, e.g., 5 Gigahertz (GHz) and / or 6 GHz, that is not dedicated or licensed for use by only one technology or operator. Because the frequency band is not dedicated for use by only one technology, UEs operating on the unlicensed spectrum are configured with features for accessing and communicating on the unlicensed spectrum. These features includes channel access mechanisms, such as listen-before-talk (LBT) and channel occupancy time (COT), and channel access requirements, such as the occupied channel bandwidth (OCB) requirement. Generally, the channel access mechanisms involve an initiating UE obtaining access to a sidelink channel on the unlicensed spectrum to communicate with a responding UE. The initiating UE can be a transmitter UE and the responding UE can be a receiving UE, or vice versa.

[0048] Channel occupancy time (COT) procedures specify that an initiating UE that has accessed an unlicensed spectrum channel will maintain control of the channel until there is a threshold gap in the channel occupancy, e.g., 16 microseconds (us). Such a gap signals to other UEs attempting to access the channel that the channel is no longer occupied. As such, if the initiating UE does not use the channel (e.g., by transmitting or receiving on the channel) for atAttorney Docket No. 56990-0008WO1 / P65021WO1 least 16 us, the UE will lose control of the channel, even if the UE has additional data to transmit or receive. The occupied channel bandwidth (OCB) requirement specifies that an initiating UE must use a threshold percentage of the accessed channel bandwidth (e.g., 80%) when using the channel. If the initiating UE does not satisfy this requirement, then the UE can lose access to the channel.

[0049] Although these unlicensed spectrum features have been used in non-sidelink communications, e.g., New Radio-Unlicensed (NR-U), using them for SL-U presents challenges unique to sidelink. One issue is related to Physical Sidelink Feedback Channel (PSFCH). Generally, sidelink communications include, in some or all slots, PSFCH occasions for carrying feedback related to the successful or failed reception of a preceding sidelink transmission, e.g., on a Physical Sidelink Shared Channel (PSSCH) or a Physical Sidelink Control Channel (PSCCH).

[0050] FIG.2A illustrates physical resources of a sidelink slot that includes a PSFCH occasion, according to some implementations. As shown in FIG. 2A, the slot can include an automatic gain control (AGC) symbol, PSCCH symbols, PSSCH symbols, and two PSFCH symbols. The PSFCH symbols include resources for AGC training. For example, one symbol can be dedicated for AGC training and the other symbol can be dedicated to PSFCH. Further, the slot includes a gap symbol before the PSFCH symbols and a gap symbol after the PSFCH symbols. For reference, FIG. 2B illustrates physical resources of a sidelink slot that does not include a PSFCH occasion.

[0051] Returning to the issue related to PSFCH that arises in SL-U, in some instances, PSFCH occasions are not used. In particular, leaving a PSFCH occasion empty on the unlicensed spectrum may result in an initiating UE losing its access to channel because the UE not transmitting / receiving during the PSFCH occasion may result in a gap greater than the threshold gap for maintaining COT. This occurs even if the initiating UE has additional data to transmit / receive.

[0052] Another issue is related to satisfying the OCB requirement in SL-U. The unlicensed spectrum includes 20 Megahertz (MHz) channels called resource block (RB) sets. A sidelink bandwidth part (BWP) can include one or more than one RB set. In either scenario, a transmitting UE must occupy at least a threshold percentage of the accessed channel bandwidth to satisfy the OCB requirement. However, some communications may not occupy enough of the one or more RB sets to satisfy the OCB requirement.Attorney Docket No. 56990-0008WO1 / P65021WO1

[0053] A sidelink synchronization signal block (S-SSB), for example, is transmitted on 11 RBs, as shown in FIG. 3A. To meet the OCB requirement when accessing one RB set, the transmitting UE may repeat the S-SSB in frequency domain in the one RB set, as shown in FIG. 3B. And to meet the OCB requirement when accessing on more than one RB set, the transmitting UE may repeat the S-SSB in each RB set, as shown in FIG. 3C. If the UE only does so on one of the RB sets, the UE may lose control of the other RB sets. However, when repeating the S-SSB transmissions, the transmitting UE cannot use legacy S-SSB parameters (e.g., transmission power) as those parameters do not account for repeating signals. For example, using the same legacy transmission power for each S-SSB transmission will result in failure of the transmissions as the total transmission power will exceed UE capabilities.

[0054] For unlicensed spectrum, each transmission occupies 80% of the resource block set. Regarding power control for sidelink system synchronization block (S-SSB) transmission, a UE may transmit S-SSB repetition in more than one RB set. At least the power for S-SSB transmission on anchor RB sets is unchanged due to the number of used RB sets. On an anchor RB set, there is a (pre-)configured offset Poffset anchor to limit the maximum power accordingA#]##?B !CH [dBm], where i is a slot index and the value range of !.ffg(-_+ / )^.`is: {10log(N), [10log(N)+2, 10log(N)+4, …], 10log(W)}. For a non-anchor RB set, the UE first allocates power for S-SSB repetitions on an anchor RB set, and assumes the power of each S-SSB repetition is !#]##?_+ / )^.`.

[0055] Then, the UE allocates the remaining power !h(f-equally to other S-SSB repetitions on all other used RB sets, whereand !%cdeand !#]##?_+ / )^.`are converted to linear unit (i.e, Watt) in this formula. For both anchor RB set and non-anchor RB set transmissions, the same downlink pathloss is taken into account.

[0056] In the above (and forthcoming), M is the total number of RB sets within a sidelink BWP, N is the number of S-SSB repetitions within the anchor RB set, W is the maximum total number of S-SSB repetitions on RB sets within the sidelink BWP. The above power for S-SSB transmission refers to power of one S-SSB repetition. A UE at least attempts to transmit on the anchor RB set. An anchor RB set refers to an RB set where S-SSB indicated by sl- AbsoluteFrequencySSB-r16 is located. In the foregoing scenario, !%cdeis determined according to TS 38.101-1 for transmission of all S-SSB repetitions on all used RB sets.Attorney Docket No. 56990-0008WO1 / P65021WO1

[0057] Some aspects of the present disclosure relate to power control for PSFCH . Regarding PSFCH transmission with 15 kHz and 30 kHz subchannel spacing (SCS), one or more of the following options can be supported.

[0058] In some implementations, each PSFCH transmission occupies 1 common interlace and K3 dedicated PRB(s), where K3 is (pre-)configured to have a value range of {1, 2, 5}. K3 dedicated PRB(s) are on the same interlace. There can be some guard band PRB(s) between common PRB and dedicated PRB. The term (pre-)configured in this specification and claims implies that a feature can be pre-set or can be set or reset by altering a configuration through synchronization or agreement between a UE and another UE or between a UE and a base station.

[0059] On the K3 dedicated PRB(s), multiple cyclic shift (CS) pairs can be used, as in other NR sidelink PSFCH transmission schemes. When a PRB of a common interlace and a dedicated PRB are within the same 1 MHz bandwidth, the UE transmits on the dedicated PRB subject to meeting occupied channel bandwidth (OCB) constraints. Transmit power may, in some cases, be reduced on common PRBs. The number of guard band PRB(s) may be configurable. In some cases, a (pre-)configured gap (including 0) can be used. In other cases, this can be satisfied by (pre-)configuration without additional specification impact (e.g., setting proper bit values in bitmap for PSFCH PRB allocation), etc.

[0060] In some implementations, each PSFCH transmission occupies 1 dedicated interlace. PSSCH transmissions on non-overlapped resources can be mapped to orthogonal dedicated PRBs for PSFCH transmission. PRB-level cyclic shift hopping may be supported (as in NR- U) to reduce PAPR; it may also be possible to drop common PRBs if the dedicated PRBs satisfy OCB constraints.

[0061] In some implementations, the power control for PSFCH is determined based first on the overall structure for PSFCH transmissions (common interlace with K3 dedicated PRBs or dedicated interlace). Then, the power control for PSFCH transmissions can be determined based on a number of PRBs, a total power level, PRB spacing in frequency domain, and other factors, as discussed in more detail below.

[0062] When neither a COT-initiating UE nor a responding UE intends to transmit PSFCH on some PSFCH occasion(s) within a COT, to avoid COT interruption, one or more of the following options can be used. In some implementations, the COT-initiating UE or responding UE transmits PSSCH on such PSFCH occasion(s). In other implementations, the COT-Attorney Docket No. 56990-0008WO1 / P65021WO1 initiating UE or responding UE transmits a PSFCH-like signal on such PSFCH occasion(s). The present disclosure allows a UE to maintain COT using a PSFCH-like message. For one PSCCH / PSSCH transmission that has N associated candidate PSFCH occasion(s) via (pre- )configuration, a value range of N at least includes {1, 2, 3, 4}. When N is greater than 1, N associated candidate PSFCH occasion(s) for one PSCCH / PSSCH transmission have different time and / or frequency resources with the candidate PSFCH occasion(s) for another PSCCH / PSSCH transmission, at least if these two PSCCH / PSSCH transmissions are on non- overlapped resources.

[0063] Some aspects of the present disclosure relate to configuring PSFCH-like transmissions for a UE to maintain COT. The present disclosure also pertains to UE behavior during PSCCH or PSSCH transmission. If one PSCCH / PSSCH transmission has N associated candidate PSFCH occasion(s), the Rx UE may use one or more of the following approaches to receive PSFCH for the PSCCH / PSSCH transmission. For unicast monitoring, the Rx UE attempts to monitor candidate PSFCH occasion(s) until one PSFCH is detected or all candidate PSFCH occasion(s) are monitored. If one PSFCH is detected, the Rx UE can refrain from monitoring following candidate PSFCH occasion(s).

[0064] For reporting, if the Rx UE receives PSFCH, the Rx UE reports the same value as a value of HARQ-ACK information that the UE determines from PSFCH reception to higher layers; otherwise, the UE reports NACK to higher layer.

[0065] For groupcast monitoring (NACK only): the Rx UE attempts to monitor all candidate PSFCH occasions. If a NACK is detected, the Rx UE can refrain from monitoring the following candidate PSFCH occasion(s). For reporting, if the Rx UE does not detect any PSFCH in all candidate PSFCH occasions, the Rx UE reports ACK to higher layers; otherwise, the UE reports NACK to higher layers.

[0066] For groupcast monitoring (ACK / NACK): the Rx UE attempts to monitor PSFCH transmission occasions until PSFCH from all transmitters have been detected or all candidate PSFCH occasions are monitored. If the Rx UE detects PSFCH from one PSFCH transmitter, the Rx UE can skip PSFCH detection for the following PSFCH transmission occasions for this PSFCH transmitter. For reporting, if an ACK has been detected from at least one PSFCH occasion of each of all expected PSSCH receivers, the Rx UE reports ACK to higher layers; otherwise, the RX UE reports NACK to higher layers.Attorney Docket No. 56990-0008WO1 / P65021WO1

[0067] For unicast monitoring, the Rx UE attempts to monitor all candidate PSFCH occasion(s). If one PSFCH is detected, the Rx UE can refrain from monitoring the following candidate PSFCH occasion(s), if any. The Rx UE can also use a PSFCH prioritization rule.

[0068] For groupcast monitoring (ACK / NACK): the Rx UE attempts to monitor all PSFCH transmission occasions. If the Rx UE detects PSFCH from a PSFCH transmitter, the Rx UE can skip PSFCH detection for following PSFCH transmission occasions for this PSFCH transmitter, if any. The Rx UE can also use a PSFCH prioritization rule.

[0069] Each PSFCH transmission may occupy 1 common interlace and K3 dedicated PRB(s). If the UE transmits N PSFCH, the final Tx power on one common PRB is denoted as P_common, and the final Tx power on one dedicated PRB may be denoted as P_dedicated, where P_common <= P_dedicated; and an offset between P_common and P_dedicated is (pre- )configured.

[0070] In some implementations, the following power relationships between the power for resource blocks on the common interlace versus the resource blocks of the dedicated interlace can also be supported: P_common < P_dedicated; or P_common = P_dedicated.

[0071] As described herein, PSFCH can carry ACK, NACK, and HARQ feedback. This disclosure describes systems and methods for supporting sidelink communications on an unlicensed spectrum. This disclosure describes systems and methods for (1) power control for PSFCH transmissions; (2) designs for PSFCH-like sequences to maintain COT; and (3) UE behavior for transmitting or receiving PSFCH for PSSCH MCSt transmissions.

[0072] FIG. 4 illustrates an example communication system 400 that includes sidelink communications, according to some implementations. It is noted that the system of FIG. 4 is merely one example of a possible system, and that features of this disclosure may be implemented in other wireless communication systems.

[0073] The following description is provided for an example communication system that operates in conjunction with fifth generation (5G) networks as provided by 3GPP technical specifications. However, the example implementations are not limited in this regard and the described examples may apply to other networks that may benefit from the principles described herein, such as 3GPP Long Term Evolution (LTE) networks, Wi-Fi or Worldwide Interoperability for Microwave Access (WiMaX) networks, and the like. Furthermore, other types of communication standards are possible, including future 3GPP systems (e.g., SixthAttorney Docket No. 56990-0008WO1 / P65021WO1 Generation (6G)), IEEE 802.16 protocols, or the like. While aspects may be described herein using terminology commonly associated with 5G NR, aspects of the present disclosure can be applied to other systems, such as 3G, 4G, and / or systems subsequent to 5G (e.g., 6G).

[0074] Frequency bands for 5G NR may be separated into two different frequency ranges. Frequency Range 1 (FR1) may include frequency bands operating in sub-6 GHz frequencies, some of which are bands that may be used by previous standards, and may potentially be extended to cover new spectrum offerings from 410 MHz to 7125 MHz. Frequency Range 2 (FR2) may include frequency bands from 24.25 GHz to 52.6 GHz. Bands in the millimeter wave (mmWave) range of FR2 may have smaller coverage but potentially higher available bandwidth than bands in the FR1.

[0075] As shown, the communication system 400 includes a number of user devices. More specifically, the communication system 400 includes two UEs 405 (UE 405-1 and UE 405-2 are collectively referred to as “UE 405” or “UEs 405”), two base stations 410 (base station 410-1 and base station 410-2 are collectively referred to as “base station 410” or “base stations 410”), two cells 415 (cell 415-1 and cell 415-2 are collectively referred to as “cell 415” or “cells 415”), and one or more servers 435 in a core network (CN) 440 that is connected to the Internet 445.

[0076] In some implementations, the UEs 405 can directly communicate with base stations 410 via links 420 (link 420-1 and link 420-2 are collectively referred to as “link 420” or “links 420”), which utilize a direct interface with the base stations referred to as a “Uu interface.” Each of the links 420 can represent one or more channels. The links 420 are illustrated as an air interface to enable communicative coupling, and can be consistent with cellular communication protocols, such as a GSM protocol, a CDMA network protocol, a UMTS protocol, a 3GPP LTE protocol, an Advanced long term evolution (LTE-A) protocol, a LTE- based access to unlicensed spectrum (LTE-U), a 5G protocol, a NR protocol, an NR-based access to unlicensed spectrum (NR-U) protocol, and / or any of the other communications protocols discussed herein.

[0077] As shown, certain user devices may be able to conduct communications with one another directly, e.g., without an intermediary infrastructure device such as base station 410-1. In this example, UE 405-1 may conduct communications directly with UE 405-2. Similarly, the UE 405-2 may conduct communications directly with UE 405-1. Such peer-to-peer communications may utilize a “sidelink” interface such as a PC5 interface. In certainAttorney Docket No. 56990-0008WO1 / P65021WO1 implementations, the PC5 interface supports direct cellular communication between user devices (e.g., between UEs 405), while the Uu interface supports cellular communications with infrastructure devices such as base stations. For example, the UEs 405 may use the PC5 interface for a radio resource control (RRC) signaling exchange between the UEs (also called PC5-RRC signaling). The PC5 / Uu interfaces are used only as an example, and PC5 as used herein may represent various other possible wireless communications technologies that allow for direct sidelink communications between user devices, while Uu in turn may represent cellular communications conducted between user devices and infrastructure devices, such as base stations.

[0078] In some implementations, the UEs 405 may be configured with parameters for communicating via the Uu interface and / or the sidelink interface. In some examples, the UEs 405 may be “pre-configured” with some parameters. In these examples, the parameters may be hardwired into the UEs 405 or coded into spec. Additionally and / or alternatively, the UEs 405 may receive the parameters from the one or more of the base stations 410.

[0079] To transmit / receive data to / from one or more base stations 410 or UEs 405, the UEs 405 may include a transmitter / receiver (or alternatively, a transceiver), memory, one or more processors, and / or other like components that enable the UEs 405 to operate in accordance with one or more wireless communications protocols and / or one or more cellular communications protocols. The UEs 405 may have multiple antenna elements that enable the UEs 405 to maintain multiple links 420 and / or sidelinks 425 to transmit / receive data to / from multiple base stations 410 and / or multiple UEs 405. For example, as shown in FIG.4, UE 405-1 may connect with base station 410-1 via link 420 and simultaneously connect with UE 405-2 via sidelink 425.

[0080] In some implementations, one or more sidelink radio bearers may be established on the sidelink 425. The sidelink radio bearers can include signaling radio bearers (SRB) and / or data radio bearers (DRB).

[0081] The PC5 interface may alternatively be referred to as a sidelink interface and may include one or more logical channels, including but not limited to a Physical Sidelink Control Channel (PSCCH), a Physical Sidelink Shared Channel (PSSCH), a Physical Sidelink Discovery Channel (PSDCH), a Physical Sidelink Broadcast Channel (PSBCH), Physical Sidelink Feedback Channel (PSFCH), and / or any other like communications channels. The PSFCH carries feedback related to the successful or failed reception of a sidelink transmission.Attorney Docket No. 56990-0008WO1 / P65021WO1 The PSSCH can be scheduled by sidelink control information (SCI) carried in the sidelink PSCCH. In some examples, the sidelink interface can operate on an unlicensed spectrum (e.g., in the unlicensed 5 Gigahertz (GHz) and 6 GHz bands) or a (licensed) shared spectrum.

[0082] In one example, the sidelink interface implements vehicle-to-everything (V2X) communications. The V2X communications may, for example, adhere to 3GPP Cellular V2X (C-V2X) specifications, or to one or more other or subsequent standards whereby vehicles and other devices and network entities may communicate. V2X communications may utilize both long-range (e.g., cellular) communications as well as short- to medium-range (e.g., non- cellular) communications. Cellular-capable V2X communications may be called Cellular V2X (C-V2X) communications. C-V2X systems may use various cellular radio access technologies (RATs), such as 4G LTE or 5G NR RATs (or RATs subsequent to 5G, e.g., 6G RATs). Certain LTE standards usable in V2X systems may be called LTE-Vehicle (LTE-V) standards. As used herein in the context of V2X systems, and as defined above, the term “user devices” may refer generally to devices that are associated with mobile actors or traffic participants in the V2X system, e.g., mobile (able-to-move) communication devices such as vehicles, pedestrian user equipment (PUE) devices, and road side units (RSUs).

[0083] In some implementations, UEs 405 may be physical hardware devices capable of running one or more applications, capable of accessing network services via one or more radio links 420 with a corresponding base station 410 (also referred to as a “serving” base station), and capable of communicating with one another via sidelink 125. Link 420 may allow the UEs 405 to transmit and receive data from the base station 410 that provides the link 420. The sidelink 425 may allow the UEs 405 to transmit and receive data from one another. The sidelink 425 between the UEs 405 may include one or more channels for transmitting information from UE 405-1 to UE 405-2 and vice versa and / or between UEs 405 and UE-type RSUs and vice versa.

[0084] In some implementations, the base stations 410 are capable of communicating with one another over a backhaul connection 430 and may communicate with the one or more servers 435 within the CN 440 over another backhaul connection 433. The backhaul connections can be wired and / or wireless connections.

[0085] In some implementations, the UEs 405 are configured to use a resource pool for sidelink communications. A sidelink resource pool defines the time-frequency resources used for sidelink communications, and may be divided into multiple time slots, frequency channels, andAttorney Docket No. 56990-0008WO1 / P65021WO1 frequency sub-channels. In some examples, the UEs 405 are synchronized and perform sidelink transmissions aligned with slot boundaries. A UE may be expected to select several slots and sub-channels for transmission of the transport block (TB). In some examples, a UE may use different sub-channels for transmission of the TB across multiple slots within its own resource selection window.

[0086] In some implementations, an exceptional resource pool may be configured for the UEs 405, perhaps by the base stations 410. The exceptional resource pool includes resources that the UEs 405 can use in exceptional cases, such as Radio Link Failure (RLF). The exceptional resource pool may include resources selected based on a random allocation of resources.

[0087] In some implementations, a UE that is initiating a communication with another UE is referred to as a transmitter UE (TX UE), and the UE receiving the communication is referred to as a receiver UE (RX UE). For example, UE 405-1 may be a TX UE and UE 405-2 may be an RX UE. Although FIG. 4 illustrates a single TX UE communicating with a single RX UE, a TX UE may communicate with more than one RX UE via sidelink.

[0088] In some implementations, a TX UE that is initiating sidelink communication may determine the available resources (e.g., sidelink resources) and may select a subset of these resources to communicate with an RX UE based on a resource allocation scheme. Example resource allocation schemes include Mode 1 and Mode 2 resource allocation schemes. In Mode 1 resource allocation scheme (referred to as “Mode 1”), the resources are allocated by a network node for in-coverage UEs. In Mode 2 resource allocation scheme (referred to as “Mode 2”), the TX UE selects the sidelink resources (e.g., sidelink transmission resources).

[0089] In some implementations, the communication system 400 supports different cast types, including unicast, broadcast, and groupcast (or multicast) communications. Unicast refers to direction communications between two UEs. Broadcast refers to a communication that is broadcast by a single UE to a plurality of other UEs. Groupcast refers to communications that are sent from a single UE to a set of UEs that satisfy a certain condition (e.g., being a member of a particular group).

[0090] In Rel-16 NR sidelink, each PSFCH transmission occupies 1 PRB. In SL-U, each PSFCH transmission occupies 1 common interlace and K3 dedicated PRBs, or each PSFCH transmission occupies 1 dedicated interlace. In other words, each PSFCH transmission occupies more than 1 PRB. Hence, the existing power control formula for PSFCH does not consider the number of PRBs of each PSFCH transmission.Attorney Docket No. 56990-0008WO1 / P65021WO1

[0091] In some implementations, a PSFCH transmission may be composed of a dedicated interlace. This is depicted in FIG. 5. FIG. 5 is a schematic diagram illustrating an example of two dedicated interlaces for transmitting PSFCH in accordance with some implementations of the present disclosure. Each interlace includes a set of PRBs. Each set of PRBs can be used to send one PSFCH transmission.

[0092] PSFCH transmission power can be controlled based on the number of PRBs for the dedicated interlace. Different options exist for determining the number of PRBs for the dedicated interlace. If each PSFCH transmission occupies 1 dedicated interlace, the transmit power of each PSFCH is given byAUVWXYB !C, where !"#$%&,. / (is the transmit power of the dedicated interlace for one PSFCH transmission, <>"?#$%&is a number of PRBs reserved for PSFCH transmission, PO,PSFCHis a value of dl-P0- PSFCH, A"#$%&is a value of dl-Alpha-PSFCH if provided; else A"#$%&is 1. (TS 38.213 Section 16.2.3), µ is the numerology of the sidelink, (e.g., µ=0 for 15 kHz sub-carrier spacing, µ=1 for 30 kHz sub-carrier spacing), and PL is the downlink pathloss. <ZU[VWXYis a (pre- )configured reference number of PRBs of one interlace. An interlace could be either 10 PRBs or 11 PRBs. An RRC parameter numRefPRBOfInterlace can be introduced to indicate the reference number of PRBs of one interlace within 1 RB set for the purpose of sidelink transport block size (TBS). The same parameter can be reused to determine the PSFCH transmission power.

[0093] If one PSFCH transmission is associated with the dedicated interlace of 10 PRBs, and another PSFCH transmission is associated with the dedicated interlace of 11 PRBs, then !"#$%&,. / (value is not unique .

[0094] In some implementations, <>"?#$%&is always 10 PRBs, or the minimum number of PRBs per interlace in the resource pool / sidelink BWP.

[0095] In some implementations, <>"?#$%&is always 11 PRBs, or the maximum number of PRBs per interlace in the resource pool / sidelink BWP

[0096] In some implementations, <>"?#$%&is resource pool (pre)configured number of PRBs (e.g., either 10 PRBs or 11 PRBs).Attorney Docket No. 56990-0008WO1 / P65021WO1

[0097] It is possible that the (pre)configured number is the same as or different from the number of PRBs per interlace used for sidelink TBS determination (e.g., the parameter numRefPRBOfInterlace).

[0098] In some implementations, <>"?#$%&is sidelink BWP (pre)configured number of PRBs (e.g., either 10 PRBs or 11 PRBs).

[0099] It is possible that the (pre)configured number is the same as or different from the number of PRBs per interlace used for sidelink TBS determination (e.g., the parameter numRefPRBOfInterlace).

[0100] For a PSFCH occupying a dedicated interlace, the transmit power of each PSFCH is given as:AUVWXYB !C, where <ljmknopis given by the RRC parameter numRefPRBOfInterlace, indicating the reference number of PRBs of one interlace within 1 RB set.

[0101] In some cases, PSFCH is sent over multiple RB sets to maintain a COT. If the PSFCH transmission is for a PSSCH / PSCCH transmission, both PSSCH / PSCCH and PSFCH over multiple RB sets are supported. In such cases, the PSFCH transmission is considered as multiple PSFCH transmissions.

[0102] The PSFCH transmission power can be adjusted based on power spectral density (PSD) limit (e.g., 10 dBm / MHz or 17 dBm / MHz). To meet PSD limit (10 dBm / MHz), the following relationships can be defined.

[0103] If !"#$%&,. / (D 1234567E9:B <>"?#$%&H is larger than 10 dBm (e.g., PSD limitation),

[0104] If RBs from C (C q 1) dedicated interlaces for scheduled PSFCH transmissions is less thanlarger than 10 dBm (e.g., PSD limitation), update

[0105] In some implementations, the PSFCH transmission power can be adjusted if two RBs from two PSFCH transmissions are within 1 MHz.

[0106] If each PSFCH transmission occupies 1 common interlace and K3 dedicated PRBs, the number of PRBs for the common interlace and the number of dedicated PRBs may be different.Attorney Docket No. 56990-0008WO1 / P65021WO1 Furthermore, the transmit power on each common PRB may be less than or equal to the transmit power on each dedicated PRB. If a UE transmits multiple PSFCH transmissions simultaneously, it is possible to increase the transmit power on common PRBs due to multiple PSFCH transmissions.

[0107] The PSFCH transmission power of the common interlace and / or the PSFCH transmission power of dedicated PRB(s) can be adjusted based on the number of dedicated PRBs. This is shown in FIG. 6. FIG. 6 is a schematic diagram illustrating an example of a common interlace and two sets of dedicated PRBs for transmitting PSFCH in accordance with some implementations of the present disclosure. In this example, PSFCH is composed of a common interlace and K3 dedicated PRBs.

[0108] In accordance with aspects of the present disclosure, the Tx UE may separate the transmit power of the K3 dedicated PRBs and the transmit power of the resource blocks of the common interlace. FIG.7A is a process flow diagram of a method 700 for setting power control for PSFCH transmission in accordance with some implementations of the present disclosure.

[0109] At 702, the method 700 includes determining a transmit power for dedicated PRBs based on the (pre)configured number of dedicated PRBs for the PSFCH transmission. The transmit power of each PSFCH on K3 dedicated PRBs is given byis given by the existing RRC parameter numRefPRBOfInterlace indicating the number of dedicated PRBs for a PSFCH, PPSFCH,oneis the power for transmitting K3 PRBs for PSFCH transmission, PO,PSFCH is a (pre-)configured value of nominal power defined by dl- P0-PSFCH set in a sidelink power control field, K3 is the (pre-)configured number of PRBs for the PSFCH transmission, αPSFCHis a (pre-)configured value for pathloss defined by dl-alpha- PSFCH set in a sidelink power control field, and µ is the numerology of the sidelink, (e.g., µ=0 for 15 kHz sub-carrier spacing, µ=1 for 30 kHz sub-carrier spacing), and PL is the downlink pathloss.

[0110] The foregoing equation determines the PSFCH transmit power on dedicated PRBs based on a (pre-)configured number of dedicated PRBs for the PSFCH transmission.

[0111] For a PSFCH occupying a common interlace and K3 dedicated PRBs, the following procedure can be applied to determine the transmit power of PSFCH transmission on dedicated PRBs and the transmit power of PSFCH on the common interlace. The transmit power onAttorney Docket No. 56990-0008WO1 / P65021WO1 dedicated PRBs of each PSFCH transmission is determined by !"#$%&,'(')*+-(',. / (=given by the existing RRC parameter numDedicatedPRBsForPSFCH indicating the number of dedicated PRBs for a PSFCH transmission.

[0112] At 704, the method 700 includes adjusting the PSFCH transmit power on dedicated PRBs based on a PSD limit and multiple PSFCH transmissions. If the transmit power of each dedicated PRB, e.g., !"#$%&,. / (D 1234567E9:B FGH, is larger than 10 dBm (e.g., a PSD limit), the Tx UE may update / reduce !"#$%&,. / (to 1234567E9:B FGH 012 dBm. According to ETSI regulations, the maximum PSD is limited to 10 dBm / MHz and 17 dBm / MHz, in the 5150-5350 MHz band and 5470-5725 MHz band, respectively. If the transmit power of a PRB on a dedicated interlace is above this limit, the transmit power is upper bounded by PSD limit.

[0113] According to Rel-16 NR sidelink, the number of simultaneous PSFCH transmission is determined by !%cde, the number of scheduled PSFCH transmissions \g)^,xy,"#$%&, a maximum number of PSFCH transmissions \P+y,"#$%&and each PSFCH transmission power !"#$%&,. / (. If the value of !"#$%&,. / (is further upper bounded due to the PSD limit, the number of simultaneous PSFCHs transmission may be increased.

[0114] The transmit power on a PRB of dedicated interlace is upper bounded by the PSD limit. Specifically, !"#$%&,. / (is upper bounded by (PSD limitThe transmit power on a PRB is upper bounded by the PSD limit. For PSFCH occupying a dedicated interlace, lUVWXY,z{sis upper bounded by (PSD limit +12

[0115] For PSFCH occupying a common interlace and K3 dedicated PRBs, lUVWXY,rsrutvwsr,z{sis upper bounded by (PSD limit +12 |}~6789^; ^ZUV[W,rXsYrtuvwsr@).lUVWXY,uz^^z{,ws^^is upper bounded by (PSD limit + 12B j@, where lUVWXY,uz^^z{,ws^^is the temporally common interlace transmit power.luz^^z{is upper bounded by (PSD limit + 12 B |}~67E9^B ^ZUV[W,rXsYrtuvwsr^^ZUV[W,uXzY^^z{H), where lJuz^^z{is the transmit power on the common interlace.

[0116] If C dedicated RBs for a scheduled PSFCH transmissions are separated by less than 1 MHz, and if !"#$%&,. / (D 1234567E9:B FGH 01234567ECH is larger than 10 dBm (e.g., the PSD limitation), the dedicated RBs for PSFCH transmissions with the lowest priority can be dropped. The comparison to the PSD limitation and the dropping of lowest priority RBs canAttorney Docket No. 56990-0008WO1 / P65021WO1 continue until the remaining L’ dedicated RBs for scheduled PSFCH transmissions, e.g.,larger than 10 dBm.

[0117] In case of same priority between PSFCH PRBs, the UE can determine which dedicated RB to drop. Otherwise, the UE can drop dedicated RB associated with lower priority PSFCH.

[0118] At 706, the method 700 includes determining the transmission power of common interlace RBs and determining the transmission power of dedicated PRBs. First, the temporally common interlace transmit power can be determined as:where <>"?#$,)%.&PP. / is the number of PRBs of the common interlace per RB set, and β is the transmit power offset between common PRB and dedicated PRB, <>"?#$,)%.&PP. / ,-(PQis the number of PRBs of the common interlace, based on the (pre)configured interlace index of the common interlace, and S is the number of RB sets for common interlace transmissions. This maximum transmit power on common interlace over multiple RB sets is reserved when determining the simultaneous PSFCH transmissions.

[0119] In some implementations, the number of PRBs in the common interlace per RB set, <>"?#$,)%.&PP. / , is 10 PRBs, or the minimum number of PRBs per interlace in the resource pool / sidelink BWP.

[0120] In some implementation, <>"?#$,)%.&PP. / is 11 PRBs, or the maximum number of PRBs per interlace in the resource pool / sidelink BWP.

[0121] In some implementations, <>"?#$,)%.&PP. / is the resource pool (pre)configured number of PRBs (e.g., either 10 PRBs or 11 PRBs). It is possible that the (pre)configured number is the same or different from the number of PRBs per interlace used for sidelink TBS determination (e.g., the parameter numRefPRBOfInterlace).

[0122] In some implementations, <>"?#$,)%.&PP. / is the sidelink BWP (pre)configured number of PRBs (e.g., either 10 PRBs or 11 PRBs). It is possible that the (pre)configured number is the same as or different from the number of PRBs per interlace used for sidelink TBS determination (e.g., the parameter numRefPRBOfInterlace).

[0123] In some implementations, <>"?#$,)%.&PP. / is the actual number of PRBs, based on the (pre)configured interlace index of common interlace, where R is the number of RB sets forAttorney Docket No. 56990-0008WO1 / P65021WO1 common interlace transmissions. For example, R can be a resource pool (pre)configured value; or R is the maximum possible RB sets, over which UE may be scheduled to send PSFCH; or R is the total number of RB sets in a resource pool, where T is the (pre)configured offset between Pcommon and Pdedicated.

[0124] At 708, the method 700 includes determining which PSFCH transmissions are to be transmitted, depending on UE capabilities and total transmit power limit. To do so, !%cdemay be replaced by !%cdeD !).PP. / ,-(PQ. At 710, the method 700 involves determining the number of simultaneous PSFCH transmissions. According to Rel-16 NR sidelink, the number of simultaneous PSFCH transmissions is determined by !%cde, the number of scheduled PSFCH transmissions \g)^,xy,"#$%&, a maximum number of PSFCH transmissions \P+y,"#$%&and each PSFCH transmission power !"#$%&,. / (. This procedure can be reused, with the modification of !"#$%&,. / (replaced by !"#$%&,'('*)+-(',. / (, and !%cdereplaced by !%cdeD !).PP. / ,-(PQ.

[0125] If a PSFCH transmission for a PSSCH / PSCCH transmission is sent over multiple RB sets to maintain COT and both the PSSCH / PSCCH transmission and the PSFCH transmission over multiple RB sets are supported, the PSFCH transmission is considered as multiple PSFCH transmissions, one per RB set.

[0126] FIG. 7B illustrates a flowchart of an example method 701, according to some implementations. For clarity of presentation, the description that follows generally describes the method 701 in the context of the other figures in this description. For example, the method 701 can be performed by the UE 405 of FIG. 4, or any suitable system, environment, software, hardware, or combination thereof. In some implementations, various steps of the method 701 can be run in parallel, in combination, in loops, or in any order. The example method 701 shown in FIG. 7 can be modified or reconfigured to include additional, fewer, or different steps (not shown in FIG. 7), which can be performed in the order shown or in a different order.

[0127] At 714, the method 701 includes receiving control signaling that configures a sidelink transmission structure and one or more pathloss-based power control parameters for a PSFCH transmission.

[0128] At 716, the method 701 includes determining a number of PRBs for the PSFCH transmission based on the sidelink transmission structure.Attorney Docket No. 56990-0008WO1 / P65021WO1

[0129] At 718, the method 701 includes determining a transmission power for at least a subset of the PRBs based at least on the one or more pathloss-based power control parameters.

[0130] At 720, the method 701 includes transmitting the PSFCH transmission via the subset of the PRBs using the determined transmission power.

[0131] FIG. 8 is a schematic diagram illustrating the association of PSFCH between two PSSCH or PSCCH transmissions sent over different RB sets in accordance with some implementations of the present disclosure.

[0132] Once the set of PSFCH transmissions for simultaneous transmission is determined, the TX UE can determine the number of PRBs in common interlace for transmission. Considering that a PRB of common interlace and a dedicated PRB are within the same 1 MHz bandwidth, the UE transmits on the dedicated PRB subject to meeting OCB constraints. The transmit power on the common interlace can be determined aswhere <ZU[VW,uXzY^^z{is the number of PRBs of common interlace to be transmitted (e.g., PRBs not within 1 MHz bandwidth of any dedicated PRBs), and where M is counted over multiple RB sets of the resource pool and over skipped PRBs due to within 1 MHz of dedicated PRBs.

[0133] A UE with \^u^,^^,UVWXYscheduled PSFCH transmissions for HARQ-ACK information and conflict information, and capable of transmitting a maximum of \^v^,UVWXYPSFCHs, determines a number \^^,UVWXYof simultaneous PSFCH transmissions and a power !PSFCH,^EaH for a PSFCH transmission ^, 1 ^ ^ ^ \^^,UVWXY, on all the resource pools in PSFCH transmission occasion a on active sidelink BWP ^ of carrier ^ asif dl-P0-PSFCH is provided, where!O,"#$%&is a value of dl-P0-PSFCH-r17, if using the parameter is supported by the UE and the parameter is provided; else dl-P0-PSFCH-r16 if provided;JA"#$%&is a value of dl-Alpha-PSFCH, if provided; else, A"$#%&= 1, !C = !C^,f,)E^'H when the active sidelink BWP is on a serving cell ^, except that the reference signal resource is the one the UE uses for determining a power of a PUSCH transmission scheduled by a DCI format 0_0 in serving cell ^ when the UE is configured to monitor PDCCH for detection of DCI format 0_0 in serving cell ^, and the RS resource is the one corresponding toAttorney Docket No. 56990-0008WO1 / P65021WO1 the SS / PBCH block the UE uses to obtain MIB when the UE is not configured to monitor PDCCH for detection of DCI format 0_0 in serving cell ^.

[0134] In the foregoing equation, <>"?#$%&is equal to 1, if sl-PSFCH-Type is not provided; or is equal to a value of numRefPRBOfInterlace, if sl-PSFCH-Type = ‘type1’; or is equal to a value of numDedicatedPRBsForPSFCH, if sl-PSFCH-Type = ‘type2’. If sl-PSFCH-Type = type2, the temporary PSFCH transmission power for the common interlace is given as:T[dBm] where <>"?#$,)%.&PP. / ,-(PQis the number of PRBs of the interlace with index sl-PSFCH-Type2- CommonInterlace, T is provided by sl-PSFCH-Type2-PowerOffset, and S is the number of RB sets for the transmissions on a first interlace. Otherwise, !"#$%&,).PP. / ,-(PQ= 2.!"#$%&,).PP. / ,-(PQ, where !CMAXis determined for \^u^,^^,UVWXYPSFCH transmissions according to [8-1, TS 38.101-1], the number of PSFCH transmissions is given as: \xy,"#$%&= \g)^,xy,"#$%&and !"#$%&,^EaH = !"#$%&,. / ([dBm].

[0136] Otherwise, the Tx UE autonomously determines \^^,UVWXYPSFCH transmissions first with ascending order of corresponding priority field values over the PSFCH transmissions with HARQ-ACK information, if any, and then with ascending order of priority value over the PSFCH transmissions with conflict information, if any, such that \^^,UVWXYq ^^^E1, ^^*^6<*H where <*, for 1 ^ a ^ J^, is a number of PSFCHs with priority value a for PSFCH with HARQ- ACK information andfor a I ^, is a number of PSFCHs with priority value a D ^ for PSFCH with conflict information and F is defined as: the largest value satisfying !PSFCH,}^^0 1234567E^^^E1,^^*^6<*HH^ !CMAXD!"#$%&,).PP. / ,-(PQwhere !CMAXis determined according to [8-1, TS 38.101-1] for transmission of all PSFCHs in^^*^6<*, if any; or zero, otherwise.

[0137] In the foregoing equation, EaH = Mab8!CMAXD 12345678\^^,UVWXY@ D !"#$%&,).PP. / ,-(PQ, !PSFCH,one@ [dBm], where !%cdeis determined for the \^^,UVWXYPSFCH transmissions.Attorney Docket No. 56990-0008WO1 / P65021WO1

[0138] Alternatively, the UE can autonomously select \^v^,UVWXYPSFCH transmissions with ascending order of corresponding priority field values if !PSFCH,one012345678\^v^,UVWXY@ ^where !CMAXis determined for the \^v^,UVWXYPSFCH transmissions, \^^,UVWXY= \^v^,UVWXYand !PSFCH,kEaH = !PSFCH,one[dBm]

[0139] Otherwise, the UE autonomously selects \^^,UVWXYPSFCH transmissions in ascending order of corresponding priority field values over the PSFCH transmissions with HARQ-ACK information, if any, and then with ascending order of priority value over the PSFCH transmissions with conflict information, if any, such that \^^,UVWXYq ^^^E1,<*Hwhere number of PSFCHs with priority value a for PSFCH with HARQ-ACKa I ^, is a number of PSFCHs with priority value a D ^ for PSFCH with conflict information and F is defined as: the largest value satisfying !"#$%&,. / (0where !%cdeis determined for transmission of all PSFCHs in ^^*^6<*, if any; or zero, otherwise.

[0140] In the preceding description, the transmission power is given as:[dBm], where !%cdeis determined for the \^^,UVWXYsimultaneous PSFCH transmissions. Alternatively, the transmission power can be given as:where the UE autonomously determines \^^,UVWXYPSFCH transmissions with ascending order of corresponding priority field values over the PSFCH transmissions with HARQ-ACK information, if any, and then with ascending order of priority value over the PSFCH transmissions with conflict information, if any, such that \^^,UVWXYq 1 and where !o^^^is determined for the \^^,UVWXYPSFCH transmissions.

[0141] If sl-PSFCH-Type = ‘type2’, the power for a PSFCH transmission ^ on a second interlace is !PSFCH,^EaH, and the power for a PSFCH transmission!^ on a first interlace is given as:Attorney Docket No. 56990-0008WO1 / P65021WO1 where <ZU[VW,uXzY^^z{is the number of PRBs of a first interlace to be transmitted. The transmit power on a PRB is upper bounded by the PSD limit. For PSFCH occupying a dedicated interlace,J!"#$%&,. / (is upper bounded by (PSD limit +1234567E9:; <>"?#$%&H). For PSFCH occupying a common interlace and K3 dedicated PRBs, !"#$%&,'(')*+-(',. / (is upper bounded by (PSD limit+-('@). !"#$%&,).PP. / ,-(PQis upper bounded by (PSD upper bounded by (PSD limit + 12 B

[0142] Aspects of the present disclosure support using a PSFCH-like sequence to maintain COT. Some aspects of the present disclosure relate to a design for dummy PSFCH transmissions. More specifically, some aspects relate to power control of dummy PSFCH (no dedicated PRBs for PSFCH transmission). This involves determining the common interlace transmit power (for common interlace transmission of PSFCH). The transmit power can be expressed as:where <>"?#$,)%.&PP. / is the number of PRBs of the common interlace, where R is the number of RB set on which UE sends dummy PSFCH. PSD limitation),

[0144] Some aspects relate to prioritization of dummy PSFCH with uplink transmissions. Following existing prioritization rules, where the priority of dummy PSFCH is determined, the priorities for the values can be determined according to one or more of the following rules. In some implementations, the resource pool uses a (pre)configured priority value for dummy PSFCH. In some implementations, the same priority as the priority of the first PSSCH used to initiate the COT can be used. In some implementations, the same priority as the priority of the PSSCH transmission after the PSFCH occasion for dummy PSFCH transmission can be used. In some implementations, the same priority as the priority of the PSSCH transmission on the slot with the PSFCH occasion for dummy PSFCH transmission can be used. In some implementations, the priority is always lower than uplink transmissions.

[0145] Some aspects of the present disclosure relate to UE behavior for transmitting or receiving PSFCH for PSSCH MCSt transmission (in case of single TB). For a single TB overAttorney Docket No. 56990-0008WO1 / P65021WO1 MCSt, the behavior of the UE transmitting PSFCH can include attempting to transmit PSFCH on a PSFCH occasion corresponding to PSSCH MCSt, if and only if the UE fails to transmit on previous PSFCH occasion(s), e.g., due to LBT failure, or due to uplink / sidelink prioritization.

[0146] For the UE receiving the PSFCH via unicast, the UE attempts to monitor all PSFCH occasions corresponding to PSSCH transmissions in MCSt. If one PSFCH is detected, the UE can refrain from monitoring the following PSFCH occasion(s) corresponding to PSSCH MCSs transmission, if any. FIG. 9 is a schematic diagram illustrating a UE monitoring of received PSFCH transmissions in accordance with some implementations of the present disclosure.

[0147] If the UE receives a PSFCH transmission, the UE reports the same value as a value of HARQ-ACK information that the UE determines from PSFCH reception to higher layers. For groupcast (ACK / NACK), the UE can attempt to monitor all PSFCH transmission occasions corresponding to PSSCH transmissions in MCSt. If the UE detects a PSFCH transmission from a PSFCH transmitter, the UE can skip PSFCH detection for the following PSFCH transmission occasions for this PSFCH transmitter, if any. If an ACK has been detected from at least one PSFCH occasion of each of all expected PSSCH receivers, the UE may report an ACK to higher layers; otherwise, the UE can report a NACK to higher layers.

[0148] Some aspects of the present disclosure relate to multiple consecutive slot transmission (MCSt) in Mode 1. FIG. 10 is a schematic diagram illustrating support for MCSt in mode 1, in accordance with some implementations of the present disclosure. DCI format 3_0 may include a new field to indicate the number of consecutive slots or the number of HARQ processes. More specifically, this field can indicate the number of consecutive slots of the current sidelink grant. In sidelink configured grant type 1, a new field can indicate the number of consecutive slots. For example, in the information element SL-ConfiguredGrantConfig, the parameter rrc- ConfiguredSidelinkGrant may have a new field to indicate the number of consecutive slots.

[0149] To support sidelink operations in unlicensed spectrum with MCSt in Mode 1, a new field indicating the number of HARQ processes can be added to DCI format 3_0, with a field size of ^log2(\c%#-)^ bits. This may involve expanding the size of the new data indicator field in DCI format 3_0 to \c%#-bits, where \c%#-is the maximum number of consecutive slots for MCSt.Attorney Docket No. 56990-0008WO1 / P65021WO1

[0150] DCI format 3_0 is used for scheduling of NR PSCCH and NR PSSCH in one cell. The following information is transmitted by means of DCI format 3_0 with CRC scrambled by SL- RNTI or SL-CS-RNTI: resource pool index bits, where I is the total number of resource pools for transmission configured by the higher layer parameter sl-TxPoolScheduling, if configured, and sl-DiscTxPoolScheduling, if configured; time gap (3 bits) determined by higher layer parameter sl-DCI-ToSL-Trans; HARQ process number (4 bits); a new data indicator that occupies \c%#-bits, where \c%#-is the maximum number of consecutive slots for MCSt, if the higher layer parameter transmissionStructureForPSCCHandPSSCH in SL-BWP-Config is configured (1 bit otherwise); the lowest index of the subchannel allocation to the initial transmission, which occupies  345¡E\JJg#¢£^%^+ / / (hH¤ bits; the lowest index of the RB set allocation to the initial transmission, which occupies  345¡E\>?g(-H¤ bits if the higher layer parameter transmissionStructureForPSCCHandPSSCH in SL-BWP-Config is configured to 'interlaceRB' (0 bit otherwise); and the number of HARQ processes for MCSt, which occupies  345¡E\c%#-H¤ bits if the higher layer parameter transmissionStructureForPSCCHandPSSCH in SL-BWP-Config is configured (0 bits otherwise).

[0151] FIG. 11 illustrates an example UE 1100, according to some implementations. The UE 1100 may be similar to and substantially interchangeable with UEs 405 of FIG. 4.

[0152] The UE 1100 may be any mobile or non-mobile computing device, such as, for example, mobile phones, computers, tablets, industrial wireless sensors (for example, microphones, pressure sensors, thermometers, motion sensors, accelerometers, inventory sensors, electric voltage / current meters, etc.), video devices (for example, cameras, video cameras, etc.), wearable devices (for example, a smart watch), relaxed-IoT devices.

[0153] The UE 1100 may include processors 1102, RF interface circuitry 1104, memory / storage 1106, user interface 1108, sensors 1110, driver circuitry 1112, power management integrated circuit (PMIC) 1114, one or more antenna(s) 1116, and battery 1118. The components of the UE 1100 may be implemented as integrated circuits (ICs), portions thereof, discrete electronic devices, or other modules, logic, hardware, software, firmware, or a combination thereof. The block diagram of FIG. 11 is intended to show a high-level view of some of the components of the UE 1100. However, some of the components shown may be omitted, additional components may be present, and different arrangement of the components shown may occur in other implementations.Attorney Docket No. 56990-0008WO1 / P65021WO1

[0154] The components of the UE 1100 may be coupled with various other components over one or more interconnects 1120, which may represent any type of interface, input / output, bus (local, system, or expansion), transmission line, trace, optical connection, etc. that allows various circuit components (on common or different chips or chipsets) to interact with one another.

[0155] The processors 1102 may include processor circuitry such as, for example, baseband processor circuitry (BB) 1122A, central processor unit circuitry (CPU) 1122B, and graphics processor unit circuitry (GPU) 1122C. The processors 1102 may include any type of circuitry or processor circuitry that executes or otherwise operates computer-executable instructions, such as program code, software modules, or functional processes from memory / storage 1106 to cause the UE 1100 to perform operations as described herein.

[0156] In some implementations, the baseband processor circuitry 1122A may access a communication protocol stack 1124 in the memory / storage 1106 to communicate over a 3GPP compatible network. In general, the baseband processor circuitry 1122A may access the communication protocol stack to: perform user plane functions at a physical (PHY) layer, medium access control (MAC) layer, radio link control (RLC) layer, packet data convergence protocol (PDCP) layer, service data adaptation protocol (SDAP) layer, and PDU layer; and perform control plane functions at a PHY layer, MAC layer, RLC layer, PDCP layer, RRC layer, and a non-access stratum layer. In some implementations, the PHY layer operations may additionally / alternatively be performed by the components of the RF interface circuitry 1104. The baseband processor circuitry 1122A may generate or process baseband signals or waveforms that carry information in 3GPP-compatible networks. In some implementations, the waveforms for NR may be based cyclic prefix orthogonal frequency division multiplexing (OFDM) “CP-OFDM” in the uplink or downlink, and discrete Fourier transform spread OFDM “DFT-S-OFDM” in the uplink.

[0157] The memory / storage 1106 may include one or more non-transitory, computer-readable media that includes instructions (for example, communication protocol stack 1124) that may be executed by one or more of the processors 1102 to cause the UE 1100 to perform various operations described herein. The memory / storage 1106 include any type of volatile or non- volatile memory that may be distributed throughout the UE 1100. In some implementations, some of the memory / storage 1106 may be located on the processors 1102 themselves (for example, L1 and L2 cache), while other memory / storage 1106 is external to the processorsAttorney Docket No. 56990-0008WO1 / P65021WO1 1102 but accessible thereto via a memory interface. The memory / storage 1106 may include any suitable volatile or non-volatile memory such as, but not limited to, dynamic random access memory (DRAM), static random access memory (SRAM), erasable programmable read only memory (EPROM), electrically erasable programmable read only memory (EEPROM), Flash memory, solid-state memory, or any other type of memory device technology.

[0158] The RF interface circuitry 1104 may include transceiver circuitry and radio frequency front module (RFEM) that allows the UE 1100 to communicate with other devices over a radio access network. The RF interface circuitry 1104 may include various elements arranged in transmit or receive paths. These elements may include, for example, switches, mixers, amplifiers, filters, synthesizer circuitry, control circuitry, etc.

[0159] In the receive path, the RFEM may receive a radiated signal from an air interface via antenna(s) 1116 and proceed to filter and amplify (with a low-noise amplifier) the signal. The signal may be provided to a receiver of the transceiver that downconverts the RF signal into a baseband signal that is provided to the baseband processor of the processors 1102.

[0160] In the transmit path, the transmitter of the transceiver up-converts the baseband signal received from the baseband processor and provides the RF signal to the RFEM. The RFEM may amplify the RF signal through a power amplifier prior to the signal being radiated across the air interface via the antenna(s) 1116. In various implementations, the RF interface circuitry 1104 may be configured to transmit / receive signals in a manner compatible with NR access technologies.

[0161] The antenna(s) 1116 may include one or more antenna elements to convert electrical signals into radio waves to travel through the air and to convert received radio waves into electrical signals. The antenna elements may be arranged into one or more antenna panels. The antenna(s) 1116 may have antenna panels that are omnidirectional, directional, or a combination thereof to enable beamforming and multiple input, multiple output communications. The antenna(s) 1116 may include microstrip antennas, printed antennas fabricated on the surface of one or more printed circuit boards, patch antennas, phased array antennas, etc. The antenna(s) 1116 may have one or more panels designed for specific frequency bands including bands in FR1 or FR2.

[0162] The user interface 1108 includes various input / output (I / O) devices designed to enable user interaction with the UE 1100. The user interface 1108 includes input device circuitry and output device circuitry. Input device circuitry includes any physical or virtual means forAttorney Docket No. 56990-0008WO1 / P65021WO1 accepting an input including, inter alia, one or more physical or virtual buttons (for example, a reset button), a physical keyboard, keypad, mouse, touchpad, touchscreen, microphones, scanner, headset, or the like. The output device circuitry includes any physical or virtual means for showing information or otherwise conveying information, such as sensor readings, actuator position(s), or other like information. Output device circuitry may include any number or combinations of audio or visual display, including, inter alia, one or more simple visual outputs / indicators (for example, binary status indicators such as light emitting diodes “LEDs” and multi-character visual outputs), or more complex outputs such as display devices or touchscreens (for example, liquid crystal displays “LCDs,” LED displays, quantum dot displays, projectors, etc.), with the output of characters, graphics, multimedia objects, and the like being generated or produced from the operation of the UE 1100.

[0163] The sensors 1110 may include devices, modules, or subsystems whose purpose is to detect events or changes in its environment and send the information (sensor data) about the detected events to some other device, module, subsystem, etc. Examples of such sensors include, inter alia, inertia measurement units including accelerometers, gyroscopes, or magnetometers; microelectromechanical systems or nanoelectromechanical systems including 3-axis accelerometers, 3-axis gyroscopes, or magnetometers; level sensors; temperature sensors (for example, thermistors); pressure sensors; image capture devices (for example, cameras or lensless apertures); light detection and ranging sensors; proximity sensors (for example, infrared radiation detector and the like); depth sensors; ambient light sensors; ultrasonic transceivers; microphones or other like audio capture devices; etc.

[0164] The driver circuitry 1112 may include software and hardware elements that operate to control particular devices that are embedded in the UE 1100, attached to the UE 1100, or otherwise communicatively coupled with the UE 1100. The driver circuitry 1112 may include individual drivers allowing other components to interact with or control various input / output (I / O) devices that may be present within, or connected to, the UE 1100. For example, driver circuitry 1112 may include a display driver to control and allow access to a display device, a touchscreen driver to control and allow access to a touchscreen interface, sensor drivers to obtain sensor readings of sensors 1110 and control and allow access to sensors 1110, drivers to obtain actuator positions of electro-mechanic components or control and allow access to the electro-mechanic components, a camera driver to control and allow access to an embedded image capture device, audio drivers to control and allow access to one or more audio devices.Attorney Docket No. 56990-0008WO1 / P65021WO1

[0165] The PMIC 1114 may manage power provided to various components of the UE 1100. In particular, with respect to the processors 1102, the PMIC 1114 may control power-source selection, voltage scaling, battery charging, or DC-to-DC conversion.

[0166] In some implementations, the PMIC 1114 may control, or otherwise be part of, various power saving mechanisms of the UE 1100. A battery 1118 may power the UE 1100, although in some examples the UE 1100 may be mounted deployed in a fixed location, and may have a power supply coupled to an electrical grid. The battery 1118 may be a lithium ion battery, a metal-air battery, such as a zinc-air battery, an aluminum-air battery, a lithium-air battery, and the like. In some implementations, such as in vehicle-based applications, the battery 1118 may be a typical lead-acid automotive battery.

[0167] FIG.12 illustrates an example access node 1200 (e.g., a base station or gNB), according to some implementations. The access node 1200 may be similar to and substantially interchangeable with base stations 410. The access node 1200 may include processors 1202, RF interface circuitry 1204, core network (CN) interface circuitry 1206, memory / storage circuitry 1208, and one or more antenna(s) 1210.

[0168] The components of the access node 1200 may be coupled with various other components over one or more interconnects 1212. The processors 1202, RF interface circuitry 1204, memory / storage circuitry 1208 (including communication protocol stack 1214), antenna(s) 1210, and interconnects 1212 may be similar to like-named elements shown and described with respect to FIG. 11. For example, the processors 1202 may include processor circuitry such as, for example, baseband processor circuitry (BB) 1216A, central processor unit circuitry (CPU) 1216B, and graphics processor unit circuitry (GPU) 1216C.

[0169] The CN interface circuitry 1206 may provide connectivity to a core network, for example, a 5th Generation Core network (5GC) using a 5GC-compatible network interface protocol such as carrier Ethernet protocols, or some other suitable protocol. Network connectivity may be provided to / from the access node 1200 via a fiber optic or wireless backhaul. The CN interface circuitry 1206 may include one or more dedicated processors or FPGAs to communicate using one or more of the aforementioned protocols. In some implementations, the CN interface circuitry 1206 may include multiple controllers to provide connectivity to other networks using the same or different protocols.

[0170] As used herein, the terms “access node,” “access point,” or the like may describe equipment that provides the radio baseband functions for data and / or voice connectivityAttorney Docket No. 56990-0008WO1 / P65021WO1 between a network and one or more users. These access nodes can be referred to as BS, gNBs, RAN nodes, eNBs, NodeBs, RSUs, TRxPs or TRPs, and so forth, and can include ground stations (e.g., terrestrial access points) or satellite stations providing coverage within a geographic area (e.g., a cell). As used herein, the term “NG RAN node” or the like may refer to an access node 1200 that operates in an NR or 5G system (for example, a gNB), and the term “E-UTRAN node” or the like may refer to an access node 1200 that operates in an LTE or 4G system (e.g., an eNB). According to various implementations, the access node 1200 may be implemented as one or more of a dedicated physical device such as a macrocell base station, and / or a low power (LP) base station for providing femtocells, picocells or other like cells having smaller coverage areas, smaller user capacity, or higher bandwidth compared to macrocells.

[0171] In some implementations, all or parts of the access node 1200 may be implemented as one or more software entities running on server computers as part of a virtual network, which may be referred to as a CRAN and / or a virtual baseband unit pool (vBBUP). In V2X scenarios, the access node 1200 may be or act as a “Road Side Unit.” The term “Road Side Unit” or “RSU” may refer to any transportation infrastructure entity used for V2X communications. An RSU may be implemented in or by a suitable RAN node or a stationary (or relatively stationary) UE, where an RSU implemented in or by a UE may be referred to as a “UE-type RSU,” an RSU implemented in or by an eNB may be referred to as an “eNB-type RSU,” an RSU implemented in or by a gNB may be referred to as a “gNB-type RSU,” and the like.

[0172] Various components may be described as performing a task or tasks, for convenience in the description. Such descriptions should be interpreted as including the phrase “configured to.” Reciting a component that is configured to perform one or more tasks is expressly intended not to invoke 35 U.S.C. § 112(f) interpretation for that component.

[0173] For one or more embodiments, at least one of the components set forth in one or more of the preceding figures may be configured to perform one or more operations, techniques, processes, or methods as set forth in the example section below. For example, the baseband circuitry as described above in connection with one or more of the preceding figures may be configured to operate in accordance with one or more of the examples set forth below. For another example, circuitry associated with a UE, base station, network element, etc. as described above in connection with one or more of the preceding figures may be configured to operate in accordance with one or more of the examples set forth below.Attorney Docket No. 56990-0008WO1 / P65021WO1

[0174] Example 1 includes one or more processors configured to perform operations including: receiving control signaling that configures a sidelink transmission structure and one or more pathloss-based power control parameters for a PSFCH transmission; determining a number of PRBs for the PSFCH transmission based on the sidelink transmission structure; determining a transmission power for at least a subset of the PRBs based at least on the one or more pathloss- based power control parameters; and instructing RF circuitry to transmit the PSFCH transmission via the subset of the PRBs using the determined transmission power.

[0175] Example 2 includes the one or more processors of example 1, where the sidelink transmission structure for the PSFCH transmission includes a dedicated interlace sidelink transmission structure or a common interlace sidelink transmission structure.

[0176] Example 3 includes the one or more processors of any of examples 1 to 2, where the transmission power is applicable to at least one PRB of the PSFCH transmission for operation without shared spectrum channel access.

[0177] Example 4 includes the one or more processors of any of examples 1 to 3, where determining the number of PRBs includes determining a first interlace of PRBs for the PSFCH transmission in accordance with a dedicated interlace sidelink transmission structure.

[0178] Example 5 includes the one or more processors of example 4, where the transmission power is applicable to each PRB in the first interlace of PRBs for operation with shared spectrum channel access.

[0179] Example 6 includes the one or more processors of any of examples 1 to 5, where determining the number of PRBs includes determining a first interlace of PRBs and a second interlace of PRBs for the PSFCH transmission in accordance with a common interlace sidelink transmission scheme.

[0180] Example 7 includes the one or more processors of example 6, where the transmission power is applicable to each PRB in the second interlace of PRBs for operation with shared spectrum channel access.

[0181] Example 8 includes the one or more processors of any of examples 6 to 7, where the transmission power includes the transmission power on PRBs in both the first interlace and the second interlace.Attorney Docket No. 56990-0008WO1 / P65021WO1

[0182] Example 9 includes the one or more processors of any of examples 1 to 8, where receiving the control signaling includes receiving a sidelink resource pool configuration that indicates whether the PSFCH transmission occupies (i) a common interlace and a number of dedicated PRBs or (ii) a dedicated interlace.

[0183] Example 10 includes the one or more processors of example 9, where the sidelink resource pool configuration further indicates the number of dedicated PRBs to use for the PSFCH transmission.

[0184] Example 11 includes the one or more processors of any of examples 1 to 10, where receiving the control signaling includes receiving a sidelink resource pool configuration that indicates one or both of an alpha value or a power value for pathloss-based power control for the PSFCH transmission.

[0185] Example 12 includes the one or more processors of any of examples 1 to 11, where determining the number of PRBs for the PSFCH transmission includes determining the number of PRBs based at least on a PSFCH power offset value.

[0186] Example 13 includes the one or more processors of any of examples 1 to 12, where determining the number of PRBs for the PSFCH transmission includes determining the number of PRBs based at least on a maximum number of PSFCH transmissions supported by a UE.

[0187] Example 14 includes the one or more processors of any of examples 1 to 13, where determining the transmission power for at least the subset of the PRBs includes determining the transmission power based on a maximum transmission power configured for a UE.

[0188] Example 15 includes the one or more processors of any of examples 1 to 14, where determining the transmission power for at least the subset of the PRBs includes determining the transmission power based at least on a pathloss estimate of an active sidelink bandwidth part (BWP) including the subset of the PRBs.

[0189] Example 16 is a method including: receiving control signaling that configures a sidelink transmission structure and one or more pathloss-based power control parameters for a PSFCH transmission; determining a number of PRBs for the PSFCH transmission based on the sidelink transmission structure; determining a transmission power for at least a subset of the PRBs based at least on the one or more pathloss-based power control parameters; and causing transmission of the PSFCH transmission via the subset of the PRBs using the determined transmission power.Attorney Docket No. 56990-0008WO1 / P65021WO1

[0190] Example 17 includes the method of example 16, where the sidelink transmission structure for the PSFCH transmission includes a dedicated interlace sidelink transmission structure or a common interlace sidelink transmission structure.

[0191] Example 18 includes the method of any of examples 16 to 17, where the transmission power is applicable to at least one PRB of the PSFCH transmission for operation without shared spectrum channel access.

[0192] Example 19 includes the method of any of examples 16 to 18, where determining the number of PRBs includes determining a first interlace of PRBs for the PSFCH transmission in accordance with a dedicated interlace sidelink transmission structure.

[0193] Example 20 is a UE including: one or more processors; and memory storing instructions that, when executed by the one or more processors, cause the UE to perform operations including: receiving control signaling that configures a sidelink transmission structure and one or more pathloss-based power control parameters for a PSFCH transmission; determining a number of PRBs for the PSFCH transmission based on the sidelink transmission structure; determining a transmission power for at least a subset of the PRBs based at least on the one or more pathloss-based power control parameters; and transmitting the PSFCH transmission via the subset of the PRBs using the determined transmission power.

[0194] The previously-described examples are implementable using a computer-implemented method; a non-transitory, computer-readable medium storing computer-readable instructions to perform the computer-implemented method; and a computer system including a computer memory interoperably coupled with a hardware processor configured to perform the computer- implemented method or the instructions stored on the non-transitory, computer-readable medium.

[0195] A system, e.g., a base station, an apparatus including one or more baseband processors, and so forth, can be configured to perform particular operations or actions by virtue of having software, firmware, hardware, or a combination of them installed on the system that in operation causes or cause the system to perform the actions. The operations or actions performed either by the system can include the methods of any one of the preceding examples.

[0196] Any of the above-described examples may be combined with any other example (or combination of examples), unless explicitly stated otherwise. The foregoing description of one or more implementations provides illustration and description, but is not intended to beAttorney Docket No. 56990-0008WO1 / P65021WO1 exhaustive or to limit the scope of embodiments to the precise form disclosed. Modifications and variations are possible in light of the above teachings or may be acquired from practice of various embodiments.

[0197] Although the embodiments above have been described in considerable detail, numerous variations and modifications will become apparent to those skilled in the art once the above disclosure is fully appreciated. It is intended that the following claims be interpreted to embrace all such variations and modifications.

[0198] It is well understood that the use of personally identifiable information should follow privacy policies and practices that are generally recognized as meeting or exceeding industry or governmental requirements for maintaining the privacy of users. In particular, personally identifiable information data should be managed and handled so as to minimize risks of unintentional or unauthorized access or use, and the nature of authorized use should be clearly indicated to users.

Claims

Attorney Docket No. 56990-0008WO1 / P65021WO1 CLAIMS We Claim:

1. One or more processors configured to perform operations comprising: receiving control signaling that configures a sidelink transmission structure and one or more pathloss-based power control parameters for a physical sidelink feedback channel (PSFCH) transmission; determining a number of physical resource blocks (PRBs) for the PSFCH transmission based at least in part on the sidelink transmission structure; determining a transmission power for at least a subset of the PRBs based at least on the one or more pathloss-based power control parameters; and instructing radio frequency (RF) circuitry to transmit the PSFCH transmission via the subset of the PRBs using the determined transmission power.

2. The one or more processors of claim 1, wherein the sidelink transmission structure for the PSFCH transmission comprises a dedicated interlace sidelink transmission structure or a common interlace sidelink transmission structure.

3. The one or more processors of claim 1, wherein the transmission power is applicable to at least one PRB of the PSFCH transmission for operation without shared spectrum channel access.

4. The one or more processors of claim 1, wherein determining the number of PRBs comprises determining a first interlace of PRBs for the PSFCH transmission in accordance with a dedicated interlace sidelink transmission structure.

5. The one or more processors of claim 4, wherein the transmission power is applicable to each PRB in the first interlace of PRBs for operation with shared spectrum channel access.

6. The one or more processors of claim 1, wherein determining the number of PRBs comprises determining a first interlace of PRBs and a second interlace of PRBs for the PSFCH transmission in accordance with a common interlace sidelink transmission scheme.Attorney Docket No. 56990-0008WO1 / P65021WO1 7. The one or more processors of claim 6, wherein the transmission power is applicable to each PRB in the second interlace of PRBs for operation with shared spectrum channel access.

8. The one or more processors of claim 6, wherein the transmission power includes the transmission power on PRBs in both the first interlace and the second interlace.

9. The one or more processors of claim 1, wherein receiving the control signaling comprises receiving a sidelink resource pool configuration that indicates whether the PSFCH transmission occupies (i) a common interlace and a number of dedicated PRBs or (ii) a dedicated interlace.

10. The one or more processors of claim 9, wherein the sidelink resource pool configuration further indicates the number of dedicated PRBs to use for the PSFCH transmission.

11. The one or more processors of claim 1, wherein receiving the control signaling comprises receiving a sidelink resource pool configuration that indicates one or both of an alpha value or a power value for pathloss-based power control for the PSFCH transmission.

12. The one or more processors of claim 1, wherein determining the number of PRBs for the PSFCH transmission comprises determining the number of PRBs based at least on a PSFCH power offset value.

13. The one or more processors of claim 1, wherein determining the number of PRBs for the PSFCH transmission comprises determining the number of PRBs based at least on a maximum number of PSFCH transmissions supported by a user equipment (UE).

14. The one or more processors of claim 1, wherein determining the transmission power for at least the subset of the PRBs comprises determining the transmission power based at least in part on a maximum transmission power configured for a user equipment (UE).Attorney Docket No. 56990-0008WO1 / P65021WO1 15. The one or more processors of claim 1, wherein determining the transmission power for at least the subset of the PRBs comprises determining the transmission power based at least on a pathloss estimate of an active sidelink bandwidth part (BWP) comprising the subset of the PRBs.

16. A method comprising: receiving control signaling that configures a sidelink transmission structure and one or more pathloss-based power control parameters for a physical sidelink feedback channel (PSFCH) transmission; determining a number of physical resource blocks (PRBs) for the PSFCH transmission based at least in part on the sidelink transmission structure; determining a transmission power for at least a subset of the PRBs based at least on the one or more pathloss-based power control parameters; and causing transmission of the PSFCH transmission via the subset of the PRBs using the determined transmission power.

17. The method of claim 16, wherein the sidelink transmission structure for the PSFCH transmission comprises a dedicated interlace sidelink transmission structure or a common interlace sidelink transmission structure.

18. The method of claim 16, wherein the transmission power is applicable to at least one PRB of the PSFCH transmission for operation without shared spectrum channel access.

19. The method of claim 16, wherein determining the number of PRBs comprises determining a first interlace of PRBs for the PSFCH transmission in accordance with a dedicated interlace sidelink transmission structure.

20. A user equipment (UE) comprising: one or more processors; and memory storing instructions that, when executed by the one or more processors, cause the UE to perform operations comprising: receiving control signaling that configures a sidelink transmission structure and one or more pathloss-based power control parameters for a physical sidelink feedback channel (PSFCH) transmission;Attorney Docket No. 56990-0008WO1 / P65021WO1 determining a number of physical resource blocks (PRBs) for the PSFCH transmission based at least in part on the sidelink transmission structure; determining a transmission power for at least a subset of the PRBs based at least on the one or more pathloss-based power control parameters; and transmitting the PSFCH transmission via the subset of the PRBs using the determined transmission power.

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