Patent Description:
Sidelink (SL) communication is a communication scheme in which a direct link is established between User Equipments (UEs) and the UEs exchange voice and data directly with each other without intervention of an evolved Node B (eNB). SL communication is under consideration as a solution to the overhead of an eNB caused by rapidly increasing data traffic. Vehicle-to-everything (V2X) refers to a communication technology through which a vehicle exchanges information with another vehicle, a pedestrian, an object having an infrastructure (or infra) established therein, and so on. The V2X may be divided into <NUM> types, such as vehicle-to-vehicle (V2V), vehicle-to-infrastructure (V2I), vehicle-to-network (V2N), and vehicle-to-pedestrian (V2P). The V2X communication may be provided via a PC5 interface and/or Uu interface.

Regarding V2X communication, a scheme of providing a safety service, based on a V2X message such as Basic Safety Message (BSM), Cooperative Awareness Message (CAM), and Decentralized Environmental Notification Message (DENM) is focused in the discussion on the RAT used before the NR. The V2X message may include position information, dynamic information, attribute information, or the like. For example, a UE may transmit a periodic message type CAM and/or an event triggered message type DENM to another UE.

Thereafter, regarding V2X communication, various V2X scenarios are proposed in NR. For example, the various V2X scenarios may include vehicle platooning, advanced driving, extended sensors, remote driving, or the like.

<NPL>, discloses various aspects of sidelink HARQ procedures, including HARQ feedback for groupcast and CBG-based sidelink HARQ transmission and feedback.

<NPL> discusses the following issue on physical layer procedures for sidelink in NR V2X: Handling simultaneous SL and UL transmissions, TX and RX of multiple PSFCHs, Indication of HARQ feedback enable/disable, PSFCH occasion.

Meanwhile, if a PSFCH period (periodPSFCHresource) value is set to N, PSFCH resources may exist in every N SL slots belonging to a resource pool within <NUM>. For example, PSFCH resources may exist in SL slot #<NUM>, SL slot #N, SL slot #2N, etc. However, the total number of SL slots (T_NUM) included in the resource pool within <NUM> may not be a multiple of N. In this case, a PSFCH resource mapping rule for MODULO (T_NUM, N) SL slots (herein, MODULO (X, Y) is a function deriving a remainder after dividing X by Y) may be required.

Advantageous embodiments are outlined in the dependent claims.

In one embodiment, provided is a method for performing wireless communication by a first device. The method may comprise: allocating at least one resource block (RB) from a set of a plurality of RBs for physical sidelink feedback channel (PSFCH) in a PSFCH slot, to a physical sidelink shared channel (PSSCH) resource, wherein a period of the PSFCH slot is n, wherein a number of PSSCH slots related to the PSFCH slot is i, wherein a slot index of the PSSCH resource is one of <NUM> to i - <NUM>, and wherein a subchannel index of the PSSCH resource is one of <NUM> to j - <NUM>; performing, from a second device, PSSCH reception based on the PSSCH resource related to the PSFCH slot; and transmitting, to the second device, hybrid automatic repeat request acknowledgment (HARQ-ACK) information based on the at least one RB allocated to the PSSCH resource, in response to the PSSCH reception, wherein, based on the number of PSSCH slots related to the PSFCH slot which is less than the period of the PSFCH slot, one or more RBs related to one or more resources with a slot index i to n - <NUM> from the set of the plurality of RBs for the PSFCH are not allocated to PSFCH transmission or PSFCH reception, and wherein n, i and j are positive integers.

In one embodiment, provided is a first device configured to perform wireless communication. The first device may comprise: one or more memories storing instructions; one or more transceivers; and one or more processors connected to the one or more memories and the one or more transceivers. The one or more processors may execute the instructions to: allocate at least one resource block (RB) from a set of a plurality of RBs for physical sidelink feedback channel (PSFCH) in a PSFCH slot, to a physical sidelink shared channel (PSSCH) resource, wherein a period of the PSFCH slot is n, wherein a number of PSSCH slots related to the PSFCH slot is i, wherein a slot index of the PSSCH resource is one of <NUM> to i - <NUM>, and wherein a subchannel index of the PSSCH resource is one of <NUM> to j - <NUM>; perform, from a second device, PSSCH reception based on the PSSCH resource related to the PSFCH slot; and transmit, to the second device, hybrid automatic repeat request acknowledgment (HARQ-ACK) information based on the at least one RB allocated to the PSSCH resource, in response to the PSSCH reception, wherein, based on the number of PSSCH slots related to the PSFCH slot which is less than the period of the PSFCH slot, one or more RBs related to one or more resources with a slot index i to n - <NUM> from the set of the plurality of RBs for the PSFCH are not allocated to PSFCH transmission or PSFCH reception, and wherein n, i and j are positive integers.

The UE can efficiently perform SL communication.

In the present disclosure, "A or B" may mean "only A", "only B" or "both A and B. " In other words, in the present disclosure, "A or B" may be interpreted as "A and/or B". For example, in the present disclosure, "A, B, or C" may mean "only A", "only B", "only C", or "any combination of A, B, C".

A slash (/) or comma used in the present disclosure may mean "and/or". For example, "A, B, C" may mean "A, B, or C".

In the present disclosure, "at least one of A and B" may mean "only A", "only B", or "both A and B". In addition, in the present disclosure, the expression "at least one of A or B" or "at least one of A and/or B" may be interpreted as "at least one of A and B".

In addition, in the present disclosure, "at least one of A, B, and C" may mean "only A", "only B", "only C", or "any combination of A, B, and C". In addition, "at least one of A, B, or C" or "at least one of A, B, and/or C" may mean "at least one of A, B, and C".

In addition, a parenthesis used in the present disclosure may mean "for example". Specifically, when indicated as "control information (PDCCH)", it may mean that "PDCCH" is proposed as an example of the "control information". In other words, the "control information" of the present disclosure is not limited to "PDCCH", and "PDCCH" may be proposed as an example of the "control information". In addition, when indicated as "control information (i.e., PDCCH)", it may also mean that "PDCCH" is proposed as an example of the "control information".

A technical feature described individually in one figure in the present disclosure may be individually implemented, or may be simultaneously implemented.

Layers of a radio interface protocol between the UE and the network can be classified into a first layer (layer <NUM>, L1), a second layer (layer <NUM>, L2), and a third layer (layer <NUM>, L3) based on the lower three layers of the open system interconnection (OSI) model that is well-known in the communication system. Among them, a physical (PHY) layer belonging to the first layer provides an information transfer service by using a physical channel, and a radio resource control (RRC) layer belonging to the third layer serves to control a radio resource between the UE and the network. For this, the RRC layer exchanges an RRC message between the UE and the BS.

<FIG> shows a radio protocol architecture, based on an embodiment of the present disclosure. Specifically, (a) of <FIG> shows a radio protocol stack of a user plane for Uu communication, and (b) of <FIG> shows a radio protocol stack of a control plane for Uu communication. (c) of <FIG> shows a radio protocol stack of a user plane for SL communication, and (d) of <FIG> shows a radio protocol stack of a control plane for SL communication.

A radio resource control (RRC) layer is defined only in the control plane. The RRC layer serves to control the logical channel, the transport channel, and the physical channel in association with configuration, reconfiguration and release of RBs. The RB is a logical path provided by the first layer (i.e., the physical layer or the PHY layer) and the second layer (i.e., a MAC layer, an RLC layer, a packet data convergence protocol (PDCP) layer, and a service data adaptation protocol (SDAP) layer) for data delivery between the UE and the network.

<FIG> shows a structure of a radio frame of an NR, based on an embodiment of the present disclosure.

Table <NUM> shown below represents an example of a number of symbols per slot (Nslotsymb), a number slots per frame (Nframe,uslot), and a number of slots per subframe (Nsubframe,uslot) based on an SCS configuration (u), in a case where a normal CP is used.

The BWP may be a set of consecutive physical resource blocks (PRBs) in a given numerology. The PRB may be selected from consecutive sub-sets of common resource blocks (CRBs) for the given numerology on a given carrier.

Meanwhile, the BWP may be defined for SL. The same SL BWP may be used in transmission and reception. For example, a transmitting UE may transmit an SL channel or an SL signal on a specific BWP, and a receiving UE may receive the SL channel or the SL signal on the specific BWP. In a licensed carrier, the SL BWP may be defined separately from a Uu BWP, and the SL BWP may have configuration signaling separate from the Uu BWP. For example, the UE may receive a configuration for the SL BWP from the BS/network. For example, the UE may receive a configuration for the Uu BWP from the BS/network. The SL BWP may be (pre-)configured in a carrier with respect to an out-of-coverage NR V2X UE and an RRC_IDLE UE. For the UE in the RRC_CONNECTED mode, at least one SL BWP may be activated in the carrier.

A sidelink synchronization signal (SLSS) may include a primary sidelink synchronization signal (PSSS) and a secondary sidelink synchronization signal (SSSS), as an SL-specific sequence. The PSSS may be referred to as a sidelink primary synchronization signal (S-PSS), and the SSSS may be referred to as a sidelink secondary synchronization signal (S-SSS). For example, length-<NUM>-sequences may be used for the S-PSS, and length-<NUM> gold sequences may be used for the S-SSS. For example, a UE may use the S-PSS for initial signal detection and for synchronization acquisition. For example, the UE may use the S-PSS and the S-SSS for acquisition of detailed synchronization and for detection of a synchronization signal ID.

A physical sidelink broadcast channel (PSBCH) may be a (broadcast) channel for transmitting default (system) information which must be first known by the UE before SL signal transmission/reception. For example, the default information may be information related to SLSS, a duplex mode (DM), a time division duplex (TDD) uplink/downlink (UL/DL) configuration, information related to a resource pool, a type of an application related to the SLSS, a subframe offset, broadcast information, or the like. For example, for evaluation of PSBCH performance, in NR V2X, a payload size of the PSBCH may be <NUM> bits including <NUM>-bit cyclic redundancy check (CRC).

<FIG> shows a UE performing V2X or SL communication, based on an embodiment of the present disclosure.

Referring to <FIG>, in V2X or SL communication, the term 'UE' may generally imply a UE of a user. However, if a network equipment such as a BS transmits/receives a signal according to a communication scheme between UEs, the BS may also be regarded as a sort of the UE. For example, a UE <NUM> may be a first apparatus <NUM>, and a UE <NUM> may be a second apparatus <NUM>.

<FIG> shows a procedure of performing V2X or SL communication by a UE based on a transmission mode, based on an embodiment of the present disclosure. In various embodiments of the present disclosure, the transmission mode may be called a mode or a resource allocation mode. Hereinafter, for convenience of explanation, in LTE, the transmission mode may be called an LTE transmission mode. In NR, the transmission mode may be called an NR resource allocation mode.

For example, (a) of <FIG> shows a UE operation related to an LTE transmission mode <NUM> or an LTE transmission mode <NUM>. Alternatively, for example, (a) of <FIG> shows a UE operation related to an NR resource allocation mode <NUM>. For example, the LTE transmission mode <NUM> may be applied to general SL communication, and the LTE transmission mode <NUM> may be applied to V2X communication.

For example, (b) of <FIG> shows a UE operation related to an LTE transmission mode <NUM> or an LTE transmission mode <NUM>. Alternatively, for example, (b) of <FIG> shows a UE operation related to an NR resource allocation mode <NUM>.

Referring to (a) of <FIG>, in the LTE transmission mode <NUM>, the LTE transmission mode <NUM>, or the NR resource allocation mode <NUM>, a BS may schedule an SL resource to be used by the UE for SL transmission. For example, the BS may perform resource scheduling to a UE <NUM> through a PDCCH (e.g., downlink control information (DCI)) or RRC signaling (e.g., Configured Grant Type <NUM> or Configured Grant Type <NUM>), and the UE <NUM> may perform V2X or SL communication with respect to a UE <NUM> according to the resource scheduling. For example, the UE <NUM> may transmit a sidelink control information (SCI) to the UE <NUM> through a physical sidelink control channel (PSCCH), and thereafter transmit data based on the SCI to the UE <NUM> through a physical sidelink shared channel (PSSCH).

Referring to (b) of <FIG>, in the LTE transmission mode <NUM>, the LTE transmission mode <NUM>, or the NR resource allocation mode <NUM>, the UE may determine an SL transmission resource within an SL resource configured by a BS/network or a pre-configured SL resource. For example, the configured SL resource or the pre-configured SL resource may be a resource pool. For example, the UE may autonomously select or schedule a resource for SL transmission. For example, the UE may perform SL communication by autonomously selecting a resource within a configured resource pool. For example, the UE may autonomously select a resource within a selective window by performing a sensing and resource (re)selection procedure. For example, the sensing may be performed in unit of subchannels. In addition, the UE <NUM> which has autonomously selected the resource within the resource pool may transmit the SCI to the UE <NUM> through a PSCCH, and thereafter may transmit data based on the SCI to the UE <NUM> through a PSSCH.

<FIG> shows three cast types, based on an embodiment of the present disclosure. Specifically, (a) of <FIG> shows broadcast-type SL communication, (b) of <FIG> shows unicast type-SL communication, and (c) of <FIG> shows groupcast-type SL communication. In case of the unicast-type SL communication, a UE may perform one-to-one communication with respect to another UE. In case of the groupcast-type SL transmission, the UE may perform SL communication with respect to one or more UEs in a group to which the UE belongs. In various embodiments of the present disclosure, SL groupcast communication may be replaced with SL multicast communication, SL one-to-many communication, or the like.

Hereinafter, a sidelink control information (SCI) will be described.

Control information transmitted by a BS to a UE through a PDCCH may be referred to as downlink control information (DCI), whereas control information transmitted by the UE to another UE through a PSCCH may be referred to as SCI. For example, the UE may know in advance a start symbol of the PSCCH and/or the number of symbols of the PSCCH, before decoding the PSCCH. For example, the SCI may include SL scheduling information. For example, the UE may transmit at least one SCI to another UE to schedule the PSSCH. For example, one or more SCI formats may be defined.

For example, a transmitting UE may transmit the SCI to a receiving UE on the PSCCH. The receiving UE may decode one SCI to receive the PSSCH from the transmitting UE.

For example, the transmitting UE may transmit two consecutive SCIs (e.g., <NUM>-stage SCI) to the receiving UE on the PSCCH and/or the PSSCH. The receiving UE may decode the two consecutive SCIs (e.g., <NUM>-stage SCI) to receive the PSSCH from the transmitting UE. For example, if SCI configuration fields are divided into two groups in consideration of a (relatively) high SCI payload size, an SCI including a first SCI configuration field group may be referred to as a first SCI or a <NUM>st SCI, and an SCI including a second SCI configuration field group may be referred to as a second SCI or a <NUM>nd SCI. For example, the transmitting UE may transmit the first SCI to the receiving UE through the PSCCH. For example, the transmitting UE may transmit the second SCI to the receiving UE on the PSCCH and/or the PSSCH. For example, the second SCI may be transmitted to the receiving UE through an (independent) PSCCH, or may be transmitted in a piggyback manner together with data through the PSSCH. For example, two consecutive SCIs may also be applied to different transmissions (e.g., unicast, broadcast, or groupcast).

For example, the transmitting UE may transmit the entirety or part of information described below to the receiving UE through the SCI. Herein, for example, the transmitting UE may transmit the entirety or part of the information described below to the receiving UE through the first SCI and/or the second SCI.

For example, the first SCI may include information related to channel sensing. For example, the receiving UE may decode the second SCI by using a PSSCH DMRS. A polar code used in a PDCCH may be applied to the second SCI. For example, in a resource pool, a payload size of the first SCI may be identical for unicast, groupcast, and broadcast. After decoding the first SCI, the receiving UE does not have to perform blind decoding of the second SCI. For example, the first SCI may include scheduling information of the second SCI.

Meanwhile, in various embodiments of the present disclosure, since a transmitting UE may transmit at least one of a SCI, a first SCI, and/or a second SCI to a receiving UE through a PSCCH, the PSCCH may be replaced/substituted with at least one of the SCI, the first SCI and/or the second SCI. Additionally/alternatively, for example, the SCI may be replaced/substituted with at least one of the PSCCH, the first SCI, and/or the second SCI. Additionally/alternatively, for example, since a transmitting UE may transmit a second SCI to a receiving UE through a PSSCH, the PSSCH may be replaced/substituted with the second SCI.

Hereinafter, a hybrid automatic repeat request (HARQ) procedure will be described.

In case of SL unicast and groupcast, HARQ feedback and HARQ combining in the physical layer may be supported. For example, when a receiving UE operates in a resource allocation mode <NUM> or <NUM>, the receiving UE may receive the PSSCH from a transmitting UE, and the receiving UE may transmit HARQ feedback for the PSSCH to the transmitting UE by using a sidelink feedback control information (SFCI) format through a physical sidelink feedback channel (PSFCH).

For example, the SL HARQ feedback may be enabled for unicast. In this case, in a non-code block group (non-CBG) operation, if the receiving UE decodes a PSCCH of which a target is the receiving UE and if the receiving UE successfully decodes a transport block related to the PSCCH, the receiving UE may generate HARQ-ACK. In addition, the receiving UE may transmit the HARQ-ACK to the transmitting UE. Otherwise, if the receiving UE cannot successfully decode the transport block after decoding the PSCCH of which the target is the receiving UE, the receiving UE may generate the HARQ-NACK. In addition, the receiving UE may transmit HARQ-NACK to the transmitting UE.

For example, the SL HARQ feedback may be enabled for groupcast. For example, in the non-CBG operation, two HARQ feedback options may be supported for groupcast.

For example, if the groupcast option <NUM> is used in the SL HARQ feedback, all UEs performing groupcast communication may share a PSFCH resource. For example, UEs belonging to the same group may transmit HARQ feedback by using the same PSFCH resource.

For example, if the groupcast option <NUM> is used in the SL HARQ feedback, each UE performing groupcast communication may use a different PSFCH resource for HARQ feedback transmission. For example, UEs belonging to the same group may transmit HARQ feedback by using different PSFCH resources.

For example, when the SL HARQ feedback is enabled for groupcast, the receiving UE may determine whether to transmit the HARQ feedback to the transmitting UE based on a transmission-reception (TX-RX) distance and/or reference signal received power (RSRP).

For example, in the groupcast option <NUM>, in case of the TX-RX distance-based HARQ feedback, if the TX-RX distance is less than or equal to a communication range requirement, the receiving UE may transmit HARQ feedback for the PSSCH to the transmitting UE. Otherwise, if the TX-RX distance is greater than the communication range requirement, the receiving UE may not transmit the HARQ feedback for the PSSCH to the transmitting UE. For example, the transmitting UE may inform the receiving UE of a location of the transmitting UE through SCI related to the PSSCH. For example, the SCI related to the PSSCH may be second SCI. For example, the receiving UE may estimate or obtain the TX-RX distance based on a location of the receiving UE and the location of the transmitting UE. For example, the receiving UE may decode the SCI related to the PSSCH and thus may know the communication range requirement used in the PSSCH.

For example, in case of the resource allocation mode <NUM>, a time (offset) between the PSFCH and the PSSCH may be configured or pre-configured. In case of unicast and groupcast, if retransmission is necessary on SL, this may be indicated to a BS by an in-coverage UE which uses the PUCCH. The transmitting UE may transmit an indication to a serving BS of the transmitting UE in a form of scheduling request (SR)/buffer status report (BSR), not a form of HARQ ACK/NACK. In addition, even if the BS does not receive the indication, the BS may schedule an SL retransmission resource to the UE. For example, in case of the resource allocation mode <NUM>, a time (offset) between the PSFCH and the PSSCH may be configured or pre-configured.

For example, from a perspective of UE transmission in a carrier, TDM between the PSCCH/PSSCH and the PSFCH may be allowed for a PSFCH format for SL in a slot. For example, a sequence-based PSFCH format having a single symbol may be supported. Herein, the single symbol may not an AGC duration. For example, the sequence-based PSFCH format may be applied to unicast and groupcast.

For example, in a slot related to a resource pool, a PSFCH resource may be configured periodically as N slot durations, or may be pre-configured. For example, N may be configured as one or more values greater than or equal to <NUM>. For example, N may be <NUM>, <NUM>, or <NUM>. For example, HARQ feedback for transmission in a specific resource pool may be transmitted only through a PSFCH on the specific resource pool.

For example, if the transmitting UE transmits the PSSCH to the receiving UE across a slot #X to a slot #N, the receiving UE may transmit HARQ feedback for the PSSCH to the transmitting UE in a slot #(N+A). For example, the slot #(N+A) may include a PSFCH resource. Herein, for example, A may be a smallest integer greater than or equal to K. For example, K may be the number of logical slots. In this case, K may be the number of slots in a resource pool. Alternatively, for example, K may be the number of physical slots. In this case, K may be the number of slots inside or outside the resource pool.

For example, if the receiving UE transmits HARQ feedback on a PSFCH resource in response to one PSSCH transmitted by the transmitting UE to the receiving UE, the receiving UE may determine a frequency domain and/or code domain of the PSFCH resource based on an implicit mechanism in a configured resource pool. For example, the receiving UE may determine the frequency domain and/or code domain of the PSFCH resource, based on at least one of a slot index related to PSCCH/PSSCH/PSFCH, a sub-channel related to PSCCH/PSSCH, and/or an identifier for identifying each receiving UE in a group for HARQ feedback based on the groupcast option <NUM>. Additionally/alternatively, for example, the receiving UE may determine the frequency domain and/or code domain of the PSFCH resource, based on at least one of SL RSRP, SINR, L1 source ID, and/or location information.

For example, if HARQ feedback transmission through the PSFCH of the UE and HARQ feedback reception through the PSFCH overlap, the UE may select any one of HARQ feedback transmission through the PSFCH and HARQ feedback reception through the PSFCH based on a priority rule. For example, the priority rule may be based on at least priority indication of the related PSCCH/PSSCH.

For example, if HARQ feedback transmission of a UE through a PSFCH for a plurality of UEs overlaps, the UE may select specific HARQ feedback transmission based on the priority rule. For example, the priority rule may be based on at least priority indication of the related PSCCH/PSSCH.

In the present disclosure, the term "configuration/configured or definition/defined" may be interpreted as being (pre-)configured from the base station or the network (through predefined signaling (e.g., SIB, MAC signaling, RRC signaling)). For example, "A may be configured" may include "that the base station or the network (pre-)configures/defines or informs A to the UE". For example, the term "configuration/configured or definition/defined" may be interpreted as being pre-configured or pre-defined in the system. For example, "A may be configured" may include "that A is pre-configured/defined in the system". For example, the term "configuration/configured or definition/defined" may be interpreted that a UE informs other UEs of related information (through predefined signaling (e.g., PC5 RRC signaling, MAC CE signaling, PSCCH/PSSCH signaling)). For example, "A may be configured" may include "that a UE transmits information related to A to other UEs".

Meanwhile, in NR SL, for PSFCH transmission, a UE may determine a PSFCH resource domain related to a PSSCH resource domain.

<FIG> shows a procedure for a UE to transmit/receive HARQ-ACK information based on a PSFCH resource, based on an embodiment of the present disclosure.

Referring to <FIG>, in step S1010, a UE <NUM> may transmit a PSCCH to a UE <NUM>. For example, the UE <NUM> may transmit a first SCI to the UE <NUM> through the PSCCH.

In step S1020, the UE <NUM> may transmit a PSSCH to the UE <NUM>. For example, the UE <NUM> may transmit a second SCI and a MAC PDU to the UE <NUM> through the PSSCH.

In step S1030, the UE <NUM> may determine a PSFCH resource. For example, the UE <NUM> may determine a PSFCH resource. For example, the PSFCH resource may be related to a slot and subchannel(s) used to transmit the PSSCH.

In step S1040, the UE <NUM> may transmit HARQ-ACK information to the UE <NUM> based on the PSFCH resource. For example, the UE <NUM> may receive HARQ-ACK information from the UE <NUM> based on the PSFCH resource. For example, the HARQ-ACK information may include ACK or NACK. For example, the HARQ-ACK information may include only NACK.

In the embodiment of <FIG>, in order for the UE to transmit and receive HARQ-ACK, the UE may determine the PSFCH resource related to the PSSCH resource based on an implicit rule. Specifically, for PSFCH transmission/reception in NR SL, the PSFCH resource domain related to the PSSCH resource domain may be configured, as described in Table <NUM> below. For a specific method for the UE to configure/allocate PSFCH resource(s), refer to section <NUM> of 3GPP TS <NUM> V16.

Meanwhile, if a PSFCH period (periodPSFCHresource) value is set to N, PSFCH resources may exist in every N SL slots belonging to a resource pool within <NUM>. For example, PSFCH resources may exist in SL slot #<NUM>, SL slot #N, SL slot #2N, etc..

However, the total number of SL slots (T_NUM) included in the resource pool within <NUM> may not be a multiple of N. In this case, a PSFCH resource mapping rule for MODULO (T_NUM, N) SL slots (herein, MODULO (X, Y) is a function deriving a remainder after dividing X by Y) may be required.

<FIG> shows an example in which a period of a PSFCH resource and the number of PSSCH slots related to a PSFCH slot are different, based on an embodiment of the present disclosure.

Referring to <FIG>, if the period of the PSFCH resource is <NUM>, the PSFCH slot may exist in every <NUM> slots. In this case, the period of the PSFCH resource and the number of PSSCH slots related to the PSFCH slot may be different near the end time or the start time of <NUM>. In the embodiment of <FIG>, an example is shown in which the period of the PSFCH resource = <NUM> and the number of PSSCH slots related to the PSFCH slot = <NUM>, but this is only one embodiment, and the present disclosure is not limited to the above-described embodiment. In other words, various embodiments of the present disclosure may be applied when the period of the PSFCH resource and the number of PSSCH slots related to the PSFCH slot are different.

In the following description and drawings, for convenience of description, the size (and location) of a set of PRBs for PSSCH and a set of PRBs for PSFCH for HARQ-ACK transmission are expressed identically. However, a set of RBs with different sizes (and locations) may be configured between the PSSCH and the PSFCH. That is, the size (and location) of the set of RBs for the PSSCH and the set of RBs for the PSFCH may be configured independently.

<FIG> shows an example of a PSFCH resource domain related to a PSSCH resource domain, based on an embodiment of the present disclosure.

In the embodiment of <FIG>, it is assumed that periodPSFCHresource (N) = <NUM> (currently, N = <NUM> or <NUM> or <NUM> or <NUM>), NPSFCHPSSCH = <NUM>, and Nsubch = <NUM>.

As shown in <FIG>, if the value of N and the value of NPSFCHPSSCH are the same, the UE may be configured to transmit HARQ-ACK information by using all resources (e.g., RBs) within a set of RBs for PSFCH.

However, if the value of N and the value of NPSFCHPSSCH are not the same (e.g., if the value of NPSFCHPSSCH is less than the value of N), the UE may be configured to transmit HARQ-ACK information by using only some resources within a set of RBs for PSFCH.

<FIG> show an example of a PSFCH resource domain related to a PSSCH resource domain if a period of a PSFCH resource and the number of PSSCH slots related to a PSFCH slot are different, based on an embodiment of the present disclosure. The embodiments of <FIG> may be combined with various embodiments of the present disclosure.

For example, if the value of NPSFCHPSSCH is <NUM> and the value of N is <NUM>, the UE may be configured to transmit HARQ-ACK information by using only half of the resources of the set of the corresponding RBs. In the embodiments of <FIG>, it is assumed that periodPSFCHresource (N) = <NUM> (currently, N = <NUM> or <NUM> or <NUM> or <NUM>), NPSFCHPSSCH = <NUM>, and Nsubch = <NUM>.

Referring to <FIG>, the UE may be configured to transmit HARQ-ACK information by using resources from the lowest index in the set of the corresponding RBs.

Referring to <FIG>, the UE may be configured to transmit HARQ-ACK information by using resources from the highest index in the set of the corresponding RB.

(In the example described above (e.g., <FIG> or <FIG>)), if only two PSSCH slots are available within four slots that are the period of the PSFCH resource, the related PSFCH resource may be determined, assuming that the first two PSSCH slots are (virtually) used in the four slots that are the period of the PSFCH resource. Also, for example, under the same exemplary situation, the related PSFCH resource may be determined, assuming that the last two PSSCH slots are (virtually) used in the four slots that are the period of the PSFCH resource. This is represented in <FIG>.

For the purpose of reducing in-band emission (IBE) of the transmitted PSFCH (in the above description), it may be necessary to separate PSFCH resources from each other in the frequency domain. For example, as shown in <FIG> (or <FIG>), the UE may be configured to transmit HARQ-ACK information by using resources spaced apart by the same interval (or the same offset value) in the frequency domain.

Alternatively, if the value of N and the value of NPSFCHPSSCH are not the same (e.g., the value of NPSFCHPSSCH is less than the value of N), the UE may be configured to transmit HARQ-ACK information by using all resources within a set of RBs for PSFCH, as when the value of N and the value of NPSFCHPSSCH are the same.

For example, if the value of NPSFCHPSSCH is <NUM> and the value of N is <NUM>, the UE may be configured to transmit HARQ-ACK information by using resources as shown in <FIG>.

The above example may be implemented by removing the phrase 'provided by periodPSFCHresource' or changing the phrase to 'provided by NPSFCHPSSCH' in Table <NUM>.

In addition, in the above description, frequency division multiplexing (FDM) and/or code division multiplexing (CDM) of the PSFCH may be considered. For example, when FDM/CDM are performed together, FDM may be performed first, and then CDM may be performed. In this case, in the case of CDM of the PSFCH, the size of CDM applicable in one RB may be related to the ratio of the increased resources or the absolute size of the RB in the above embodiment. Alternatively, in the case of CDM of the PSFCH, the size of CDM applicable in one RB may be kept.

For example, assuming that the size of CDM applicable in one RB is A, if the RB is doubled (as in <FIG> as compared to <FIG> (or <FIG> or <FIG> or <FIG> or <FIG>)), the size of CDM applicable in one RB may be A/<NUM>.

For example, the size of CDM may be kept at A. In this case, there may be an effect of doubling the resources available for PSFCH transmission.

For example, if the value of N and the value of NPSFCHPSSCH are not the same (e.g., if the value of NPSFCHPSSCH is less than the value of N), specifically, if the value of NPSFCHPSSCH is <NUM> and the value of N is <NUM>, the UE may be configured to transmit HARQ-ACK information, as described in <FIG>. In the embodiments of <FIG>, it is assumed that periodPSFCHresource (N) = <NUM> (currently, N = <NUM> or <NUM> or <NUM> or <NUM>), NPSFCHPSSCH = <NUM>, and Nsubch = <NUM>.

In this case, the UE may be configured to transmit HARQ-ACK information by using resources from the lowest index in the set of the corresponding RB as shown in <FIG>. Alternatively, the UE may be configured to transmit HARQ-ACK information by using resources from the highest index in the set of the corresponding RB as shown in <FIG>.

Based on various embodiments of the present disclosure described above, a method for configuring PSFCH resources in the frequency domain has been described. On the other hand, when configuring PSFCH resources in the time domain, the following case should be considered.

<FIG> show a method for configuring PSFCH resources in the time domain, based on an embodiment of the present disclosure. The embodiments of <FIG> may be combined with various embodiments of the present disclosure.

If K SL (logical) slots exist within <NUM> (physical) slots or <NUM> (physical) slots, and if the value of K is a multiple of the value of N (in the description above), there is no particular problem in configuring the PSFCH resources in the time domain. For example, if K = <NUM> and N = <NUM>, PSFCH resources may be configured from the N-th slot (or a slot with a N-<NUM> slot index) in SL (logical) slots in the earliest order in the time domain, as shown in <FIG>.

However, if the value of K is not a multiple of the value of N, i.e., if mod (K/N) is not <NUM>, the location of PSFCH resources may be configured by a relationship of the value of K and/or the value of N and/or the value of mod (K/N). Herein, for example, mod (a/b) = y may be a function which derives a remainder of dividing a by b.

For example, in the case of K = <NUM> and N = <NUM>, PSFCH resources may be configured from the mod (K/N)-th slot (e.g., in the embodiment, <NUM>st slot) (or a slot with a mod (K/N)-<NUM> slot index) in SL (logical) slots in the earliest order in the time domain, as shown in <FIG>.

Alternatively, for example, in the case of K = <NUM> and N = <NUM>, PSFCH resources may be configured from the N-th slot (or a slot with a N-<NUM> slot index) in SL (logical) slots in the earliest order in the time domain, as shown in <FIG>, as when the value of K is a multiple of the value of N.

Also, for example, whether the (some) proposed method(s) of the present disclosure is applied and/or related parameter(s) may be configured (differently) for each cast type (e.g., unicast, groupcast, broadcast). For example, whether the (some) proposed method(s) of the present disclosure is applied and/or related parameter(s) may be configured (differently) for each QoS requirement (e.g., reliability, latency). For example, whether the (some) proposed method(s) of the present disclosure is applied and/or related parameter(s) may be configured (differently) for each service type. For example, whether the (some) proposed method(s) of the present disclosure is applied and/or related parameter(s) may be configured (differently) for each service priority. For example, whether the (some) proposed method(s) of the present disclosure is applied and/or related parameter(s) may be configured (differently) for each resource pool. For example, whether the (some) proposed method(s) of the present disclosure is applied and/or related parameter(s) may be configured (differently) for each congestion level (e.g., channel busy ratio (CBR)) (of a resource pool). For example, whether the (some) proposed method(s) of the present disclosure is applied and/or related parameter(s) may be configured (differently) for each HARQ feedback method (e.g., ACK/NACK feedback or NACK only feedback).

Based on an embodiment of the present disclosure, if the number of PSSCH slots related to the PSFCH slot is less than the period N of the PSFCH resource, the UE may map PSFCH RBs to PSSCH resources (sequentially), starting from a PSFCH RB corresponding to a slot of a small index, and perform PSFCH transmission/reception. Therefore, even if the total number of SL slots included in the resource pool within <NUM> is not a multiple of the period value of the PSFCH resource, the PSFCH resource related to the PSSCH slot can be clearly derived/defined.

<FIG> shows a method for a first device to perform wireless communication, based on an embodiment of the present disclosure and in accordance with the present invention.

Referring to <FIG>, in step S2510, the first device may allocate at least one resource block (RB) from a set of a plurality of RBs for physical sidelink feedback channel (PSFCH) in a PSFCH slot, to a physical sidelink shared channel (PSSCH) resource. For example, a period of the PSFCH slot may be n, and a number of PSSCH slots related to the PSFCH slot may be i, and a slot index of the PSSCH resource may be one of <NUM> to i - <NUM>, and a subchannel index of the PSSCH resource may be one of <NUM> to j - <NUM>.

In step S2520, the first device may perform, from a second device, PSSCH reception based on the PSSCH resource related to the PSFCH slot. In step S2530, the first device may transmit, to the second device, hybrid automatic repeat request acknowledgment (HARQ-ACK) information based on the at least one RB allocated to the PSSCH resource, in response to the PSSCH reception. For example, based on the number of PSSCH slots related to the PSFCH slot which is less than the period of the PSFCH slot, one or more RBs related to one or more resources with a slot index i to n - <NUM> from the set of the plurality of RBs for the PSFCH may not be allocated to PSFCH transmission or PSFCH reception. For example, n, i and j may be positive integers.

For example, the allocation of the at least one RB from the set of the plurality of RBs for the PSFCH to the PSSCH resource may start in an ascending order of a slot index of the PSSCH resource and may continue in an ascending order of a subchannel index.

For example, based on the number of PSSCH slots related to the PSFCH slot which is less than the period of the PSFCH slot, the at least one RB related to the PSSCH resource with one of slot index <NUM> to i-<NUM> from the set of the plurality of RBs for the PSFCH may be allocated to the PSFCH transmission or the PSFCH reception.

For example, based on the number of PSSCH slots related to the PSFCH slot which is a same as the period of the PSFCH slot, the plurality of RBs for the PSFCH may be allocated to the PSFCH transmission or the PSFCH reception.

For example, in accordance with the present invention, based on the number of PSSCH slots related to the PSFCH slot which is less than the period of the PSFCH slot, at least one RB related to at least one PSSCH resource with a subchannel index m may not be contiguous with at least one RB related to at least one PSSCH resource with a subchannel index m + <NUM>. For example, m may be a positive integer greater than or equal to zero and less than or equal to j - <NUM>.

For example, the HARQ-ACK information may include ACK or NACK. For example, the HARQ-ACK information may include only NACK.

For example, 1st slot of a resource pool configured for the first device may be the PSFCH slot. For example, the period of the PSFCH slot may be a logical slot unit. For example, the period of the PSFCH slot may be configured for each resource pool.

The proposed method may be applied to the device(s) based on various embodiments of the present disclosure. First, the processor <NUM> of the first device <NUM> may allocate at least one resource block (RB) from a set of a plurality of RBs for physical sidelink feedback channel (PSFCH) in a PSFCH slot, to a physical sidelink shared channel (PSSCH) resource. For example, a period of the PSFCH slot may be n, and a number of PSSCH slots related to the PSFCH slot may be i, and a slot index of the PSSCH resource may be one of <NUM> to i - <NUM>, and a subchannel index of the PSSCH resource may be one of <NUM> to j - <NUM>.

In addition, the processor <NUM> of the first device <NUM> may control the transceiver <NUM> to perform, from a second device, PSSCH reception based on the PSSCH resource related to the PSFCH slot. In addition, the processor <NUM> of the first device <NUM> may control the transceiver <NUM> to transmit, to the second device, hybrid automatic repeat request acknowledgment (HARQ-ACK) information based on the at least one RB allocated to the PSSCH resource, in response to the PSSCH reception. For example, based on the number of PSSCH slots related to the PSFCH slot which is less than the period of the PSFCH slot, one or more RBs related to one or more resources with a slot index i to n - <NUM> from the set of the plurality of RBs for the PSFCH may not be allocated to PSFCH transmission or PSFCH reception. For example, n, i and j may be positive integers.

Based on an embodiment of the present disclosure, a first device configured to perform wireless communication may be provided. For example, the first device may comprise: one or more memories storing instructions; one or more transceivers; and one or more processors connected to the one or more memories and the one or more transceivers. For example, the one or more processors may execute the instructions to: allocate at least one resource block (RB) from a set of a plurality of RBs for physical sidelink feedback channel (PSFCH) in a PSFCH slot, to a physical sidelink shared channel (PSSCH) resource, wherein a period of the PSFCH slot is n, wherein a number of PSSCH slots related to the PSFCH slot is i, wherein a slot index of the PSSCH resource is one of <NUM> to i - <NUM>, and wherein a subchannel index of the PSSCH resource is one of <NUM> to j - <NUM>; perform, from a second device, PSSCH reception based on the PSSCH resource related to the PSFCH slot; and transmit, to the second device, hybrid automatic repeat request acknowledgment (HARQ-ACK) information based on the at least one RB allocated to the PSSCH resource, in response to the PSSCH reception, wherein, based on the number of PSSCH slots related to the PSFCH slot which is less than the period of the PSFCH slot, one or more RBs related to one or more resources with a slot index i to n - <NUM> from the set of the plurality of RBs for the PSFCH are not allocated to PSFCH transmission or PSFCH reception, and wherein n, i and j are positive integers.

Based on an embodiment of the present disclosure, an apparatus configured to control a first user equipment (UE) may be provided. For example, the apparatus may comprise: one or more processors; and one or more memories operably connected to the one or more processors and storing instructions. For example, the one or more processors may execute the instructions to: allocate at least one resource block (RB) from a set of a plurality of RBs for physical sidelink feedback channel (PSFCH) in a PSFCH slot, to a physical sidelink shared channel (PSSCH) resource, wherein a period of the PSFCH slot is n, wherein a number of PSSCH slots related to the PSFCH slot is i, wherein a slot index of the PSSCH resource is one of <NUM> to i - <NUM>, and wherein a subchannel index of the PSSCH resource is one of <NUM> to j - <NUM>; perform, from a second UE, PSSCH reception based on the PSSCH resource related to the PSFCH slot; and transmit, to the second UE, hybrid automatic repeat request acknowledgment (HARQ-ACK) information based on the at least one RB allocated to the PSSCH resource, in response to the PSSCH reception, wherein, based on the number of PSSCH slots related to the PSFCH slot which is less than the period of the PSFCH slot, one or more RBs related to one or more resources with a slot index i to n - <NUM> from the set of the plurality of RBs for the PSFCH are not allocated to PSFCH transmission or PSFCH reception, and wherein n, i and j are positive integers.

Based on an embodiment of the present disclosure, a non-transitory computer-readable storage medium storing instructions may be provided. For example, the non-transitory computer-readable storage medium storing instructions, when executed, may cause a first device to: allocate at least one resource block (RB) from a set of a plurality of RBs for physical sidelink feedback channel (PSFCH) in a PSFCH slot, to a physical sidelink shared channel (PSSCH) resource, wherein a period of the PSFCH slot is n, wherein a number of PSSCH slots related to the PSFCH slot is i, wherein a slot index of the PSSCH resource is one of <NUM> to i - <NUM>, and wherein a subchannel index of the PSSCH resource is one of <NUM> to j - <NUM>; perform, from a second device, PSSCH reception based on the PSSCH resource related to the PSFCH slot; and transmit, to the second device, hybrid automatic repeat request acknowledgment (HARQ-ACK) information based on the at least one RB allocated to the PSSCH resource, in response to the PSSCH reception, wherein, based on the number of PSSCH slots related to the PSFCH slot which is less than the period of the PSFCH slot, one or more RBs related to one or more resources with a slot index i to n - <NUM> from the set of the plurality of RBs for the PSFCH are not allocated to PSFCH transmission or PSFCH reception, and wherein n, i and j are positive integers.

<FIG> shows a method for a second device to perform wireless communication, based on an embodiment of the present disclosure.

Referring to <FIG>, in step S2610, the second device may allocate at least one resource block (RB) from a set of a plurality of RBs for physical sidelink feedback channel (PSFCH) in a PSFCH slot, to a physical sidelink shared channel (PSSCH) resource. For example, a period of the PSFCH slot may be n, and a number of PSSCH slots related to the PSFCH slot may be i, and a slot index of the PSSCH resource may be one of <NUM> to i - <NUM>, and a subchannel index of the PSSCH resource may be one of <NUM> to j - <NUM>.

In step S2620, the second device may perform, to a first device, PSSCH transmission based on the PSSCH resource related to the PSFCH slot. In step S2630, the second device may receive, from the first device, hybrid automatic repeat request acknowledgment (HARQ-ACK) information based on the at least one RB allocated to the PSSCH resource, in response to the PSSCH transmission. For example, based on the number of PSSCH slots related to the PSFCH slot which is less than the period of the PSFCH slot, one or more RBs related to one or more resources with a slot index i to n - <NUM> from the set of the plurality of RBs for the PSFCH may not be allocated to PSFCH transmission or PSFCH reception. For example, n, i and j may be positive integers.

The proposed method may be applied to the device(s) based on various embodiments of the present disclosure. First, the processor <NUM> of the second device <NUM> may allocate at least one resource block (RB) from a set of a plurality of RBs for physical sidelink feedback channel (PSFCH) in a PSFCH slot, to a physical sidelink shared channel (PSSCH) resource. For example, a period of the PSFCH slot may be n, and a number of PSSCH slots related to the PSFCH slot may be i, and a slot index of the PSSCH resource may be one of <NUM> to i - <NUM>, and a subchannel index of the PSSCH resource may be one of <NUM> to j - <NUM>.

In addition, the processor <NUM> of the second device <NUM> may control the transceiver <NUM> to perform, to a first device, PSSCH transmission based on the PSSCH resource related to the PSFCH slot. In addition, the processor <NUM> of the second device <NUM> may control the transceiver <NUM> to receive, from the first device, hybrid automatic repeat request acknowledgment (HARQ-ACK) information based on the at least one RB allocated to the PSSCH resource, in response to the PSSCH transmission. For example, based on the number of PSSCH slots related to the PSFCH slot which is less than the period of the PSFCH slot, one or more RBs related to one or more resources with a slot index i to n - <NUM> from the set of the plurality of RBs for the PSFCH may not be allocated to PSFCH transmission or PSFCH reception. For example, n, i and j may be positive integers.

Based on an embodiment of the present disclosure, a second device configured to perform wireless communication may be provided. For example, the second device may comprise: one or more memories storing instructions; one or more transceivers; and one or more processors connected to the one or more memories and the one or more transceivers. For example, the one or more processors may execute the instructions to: allocate at least one resource block (RB) from a set of a plurality of RBs for physical sidelink feedback channel (PSFCH) in a PSFCH slot, to a physical sidelink shared channel (PSSCH) resource, wherein a period of the PSFCH slot is n, wherein a number of PSSCH slots related to the PSFCH slot is i, wherein a slot index of the PSSCH resource is one of <NUM> to i - <NUM>, and wherein a subchannel index of the PSSCH resource is one of <NUM> to j - <NUM>; perform, to a first device, PSSCH transmission based on the PSSCH resource related to the PSFCH slot; and receive, from the first device, hybrid automatic repeat request acknowledgment (HARQ-ACK) information based on the at least one RB allocated to the PSSCH resource, in response to the PSSCH transmission, wherein, based on the number of PSSCH slots related to the PSFCH slot which is less than the period of the PSFCH slot, one or more RBs related to one or more resources with a slot index i to n - <NUM> from the set of the plurality of RBs for the PSFCH are not allocated to PSFCH transmission or PSFCH reception, and wherein n, i and j are positive integers.

Based on an embodiment of the present disclosure, an apparatus configured to control a second user equipment (UE) may be provided. For example, the apparatus may comprise: one or more processors; and one or more memories operably connected to the one or more processors and storing instructions. For example, the one or more processors may execute the instructions to: allocate at least one resource block (RB) from a set of a plurality of RBs for physical sidelink feedback channel (PSFCH) in a PSFCH slot, to a physical sidelink shared channel (PSSCH) resource, wherein a period of the PSFCH slot is n, wherein a number of PSSCH slots related to the PSFCH slot is i, wherein a slot index of the PSSCH resource is one of <NUM> to i - <NUM>, and wherein a subchannel index of the PSSCH resource is one of <NUM> to j - <NUM>; perform, to a first UE, PSSCH transmission based on the PSSCH resource related to the PSFCH slot; and receive, from the first UE, hybrid automatic repeat request acknowledgment (HARQ-ACK) information based on the at least one RB allocated to the PSSCH resource, in response to the PSSCH transmission, wherein, based on the number of PSSCH slots related to the PSFCH slot which is less than the period of the PSFCH slot, one or more RBs related to one or more resources with a slot index i to n - <NUM> from the set of the plurality of RBs for the PSFCH are not allocated to PSFCH transmission or PSFCH reception, and wherein n, i and j are positive integers.

Based on an embodiment of the present disclosure, a non-transitory computer-readable storage medium storing instructions may be provided. For example, the non-transitory computer-readable storage medium storing instructions, when executed, may cause a second device to: allocate at least one resource block (RB) from a set of a plurality of RBs for physical sidelink feedback channel (PSFCH) in a PSFCH slot, to a physical sidelink shared channel (PSSCH) resource, wherein a period of the PSFCH slot is n, wherein a number of PSSCH slots related to the PSFCH slot is i, wherein a slot index of the PSSCH resource is one of <NUM> to i - <NUM>, and wherein a subchannel index of the PSSCH resource is one of <NUM> to j - <NUM>; perform, to a first device, PSSCH transmission based on the PSSCH resource related to the PSFCH slot; and receive, from the first device, hybrid automatic repeat request acknowledgment (HARQ-ACK) information based on the at least one RB allocated to the PSSCH resource, in response to the PSSCH transmission, wherein, based on the number of PSSCH slots related to the PSFCH slot which is less than the period of the PSFCH slot, one or more RBs related to one or more resources with a slot index i to n - <NUM> from the set of the plurality of RBs for the PSFCH are not allocated to PSFCH transmission or PSFCH reception, and wherein n, i and j are positive integers.

Various embodiments of the present disclosure may be combined with each other.

<FIG> shows a communication system <NUM>, based on an embodiment of the present disclosure.

Referring to <FIG>, a communication system <NUM> to which various embodiments of the present disclosure are applied includes wireless devices, Base Stations (BSs), and a network. Herein, the wireless devices represent devices performing communication using Radio Access Technology (RAT) (e.g., <NUM> New RAT (NR)) or Long-Term Evolution (LTE)) and may be referred to as communication/radio/<NUM> devices. The wireless devices may include, without being limited to, a robot 100a, vehicles 100b-<NUM> and 100b-<NUM>, an eXtended Reality (XR) device 100c, a hand-held device 100d, a home appliance 100e, an Internet of Things (IoT) device 100f, and an Artificial Intelligence (AI) device/server <NUM>. For example, the vehicles may include a vehicle having a wireless communication function, an autonomous vehicle, and a vehicle capable of performing communication between vehicles. Herein, the vehicles may include an Unmanned Aerial Vehicle (UAV) (e.g., a drone). The XR device may include an Augmented Reality (AR)/Virtual Reality (VR)/Mixed Reality (MR) device and may be implemented in the form of a Head-Mounted Device (HMD), a Head-Up Display (HUD) mounted in a vehicle, a television, a smartphone, a computer, a wearable device, a home appliance device, a digital signage, a vehicle, a robot, etc. The hand-held device may include a smartphone, a smartpad, a wearable device (e.g., a smartwatch or a smartglasses), and a computer (e.g., a notebook). For example, the BSs and the network may be implemented as wireless devices and a specific wireless device 200a may operate as a BS/network node with respect to other wireless devices.

Here, wireless communication technology implemented in wireless devices 100a to 100f of the present disclosure may include Narrowband Internet of Things for low-power communication in addition to LTE, NR, and <NUM>. In this case, for example, NB-IoT technology may be an example of Low Power Wide Area Network (LPWAN) technology and may be implemented as standards such as LTE Cat NB1, and/or LTE Cat NB2, and is not limited to the name described above. Additionally or alternatively, the wireless communication technology implemented in the wireless devices 100a to 100f of the present disclosure may perform communication based on LTE-M technology. In this case, as an example, the LTE-M technology may be an example of the LPWAN and may be called by various names including enhanced Machine Type Communication (eMTC), and the like. For example, the LTE-M technology may be implemented as at least any one of various standards such as <NUM>) LTE CAT <NUM>, <NUM>) LTE Cat M1, <NUM>) LTE Cat M2, <NUM>) LTE non-Bandwidth Limited (non-BL), <NUM>) LTE-MTC, <NUM>) LTE Machine Type Communication, and/or <NUM>) LTE M, and is not limited to the name described above. Additionally or alternatively, the wireless communication technology implemented in the wireless devices 100a to 100f of the present disclosure may include at least one of Bluetooth, Low Power Wide Area Network (LPWAN), and ZigBee considering the low-power communication, and is not limited to the name described above. As an example, the ZigBee technology may generate personal area networks (PAN) related to small/low-power digital communication based on various standards including IEEE <NUM>. <NUM>, and the like, and may be called by various names.

Wireless communication/connections 150a, 150b, or 150c may be established between the wireless devices 100a to 100f/BS <NUM>, or BS <NUM>/BS <NUM>. Herein, the wireless communication/connections may be established through various RATs (e.g., <NUM> NR) such as uplink/downlink communication 150a, sidelink communication 150b (or, D2D communication), or inter BS communication (e.g. relay, Integrated Access Backhaul (IAB)). The wireless devices and the BSs/the wireless devices may transmit/receive radio signals to/from each other through the wireless communication/connections 150a and 150b. For example, the wireless communication/connections 150a and 150b may transmit/receive signals through various physical channels. To this end, at least a part of various configuration information configuring processes, various signal processing processes (e.g., channel encoding/decoding, modulation/demodulation, and resource mapping/demapping), and resource allocating processes, for transmitting/receiving radio signals, may be performed based on the various proposals of the present disclosure.

<FIG> shows wireless devices, based on an embodiment of the present disclosure.

<FIG> shows a signal process circuit for a transmission signal, based on an embodiment of the present disclosure.

<FIG> shows another example of a wireless device, based on an embodiment of the present disclosure.

<FIG> shows a hand-held device, based on an embodiment of the present disclosure. The hand-held device may include a smartphone, a smartpad, a wearable device (e.g., a smartwatch or a smartglasses), or a portable computer (e.g., a notebook). The hand-held device may be referred to as a mobile station (MS), a user terminal (UT), a Mobile Subscriber Station (MSS), a Subscriber Station (SS), an Advanced Mobile Station (AMS), or a Wireless Terminal (WT).

<FIG> shows a vehicle or an autonomous vehicle, based on an embodiment of the present disclosure. The vehicle or autonomous vehicle may be implemented by a mobile robot, a car, a train, a manned/unmanned Aerial Vehicle (AV), a ship, etc..

Claim 1:
A method for performing wireless communication by a first device (<NUM>), the method comprising:
allocating (S2510) at least one resource block, RB, from a set of a plurality of RBs for physical sidelink feedback channel, PSFCH, in a PSFCH slot, to a physical sidelink shared channel, PSSCH, resource,
wherein a period of the PSFCH slot is n,
wherein a number of PSSCH slots related to the PSFCH slot is i,
wherein a slot index of the PSSCH resource is one of <NUM> to i - <NUM>, and
wherein a subchannel index of the PSSCH resource is one of <NUM> to j - <NUM>;
performing (S2520), from a second device, PSSCH reception based on the PSSCH resource related to the PSFCH slot; and
transmitting (S2530), to the second device, hybrid automatic repeat request acknowledgment, HARQ-ACK, information based on the at least one RB allocated to the PSSCH resource, in response to the PSSCH reception,
wherein, based on the number of PSSCH slots related to the PSFCH slot which is less than the period of the PSFCH slot, one or more RBs related to one or more resources with a slot index i to n - <NUM> from the set of the plurality of RBs for the PSFCH are not allocated to PSFCH transmission or PSFCH reception,
wherein n, i and j are positive integers,
wherein, based on the number of PSSCH slots related to the PSFCH slot which is less than the period of the PSFCH slot, at least one RB related to at least one PSSCH resource with a subchannel index m is not contiguous with at least one RB related to at least one PSSCH resource with a subchannel index m + <NUM>, and
wherein m is a positive integer greater than or equal to zero and less than or equal to j - <NUM>.