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.

Prior art is found in <CIT> which generally relates to a two-stage physical sidelink control channel (PSCCH) for sidelink communications, and in LG Electronics Inc, "Discussion on measurement and report in NR SL", R2-<NUM>.

preferred embodiments of the invention are set out in the dependent claims.

Meanwhile, an inter-UE coordination message may be transmitted by being included in a medium access control (MAC) service data unit (SDU) or a MAC control element (CE) within a MAC protocol data unit (PDU). For example, in case that the inter-UE coordination message is included in the MAC CE, since the MAC CE does not have a mapping logical channel (e.g., sidelink traffic channel (STCH), sidelink control channel (SCCH)), a problem in which a priority of the MAC CE is ambiguous may occur when the UE includes the MAC CE for the inter-UE coordination message in the MAC PDU based on a logical channel prioritization (LCP) procedure. For example, in case that the inter-UE coordination message is included in the MAC SDU, since a logical channel (e.g., sidelink traffic channel (STCH), sidelink control channel (SCCH)) to which the inter-UE coordination message is mapped is not currently defined, a problem in which a priority of the MAC SDU is ambiguous may occur when the UE includes the MAC SDU for the inter-UE coordination message in the MAC PDU based on a logical channel prioritization (LCP) procedure. As described above, if a priority related to the inter-UE coordination message is not clearly defined, the UE cannot perform the LCP procedure for generating the MAC PDU.

Furthermore, if the UE-A transmits an inter-UE coordination message to the UE-B, the UE-B may not be able to distinguish whether the message transmitted by the UE-A is an inter-UE coordination message or a general data/message. Since an inter-UE coordination message is information considered for efficiently selecting SL resources, the UE-B needs to quickly recognize that the message transmitted by the UE-A is an inter-UE coordination message.

According to a first aspect, we describe a method for performing wireless communication by a first device, the method comprising: generating a medium access control, MAC, protocol data unit, PDU, including a MAC control element, CE, for inter-UE coordination information, based on logical channel prioritization, LCP; transmitting, to a second device through a physical sidelink control channel, PSCCH, first sidelink control information, SCI, for scheduling of a physical sidelink shared channel, PSSCH, and second SCI, wherein the first SCI includes information related to frequency resource assignment, information related to time resource assignment and information related to a format of the second SCI; and transmitting, to the second device through the PSSCH, the second SCI including a source ID and a destination ID, and the MAC PDU, wherein the inter-UE coordination information is included in the MAC CE for the inter-UE coordination information in the MAC PDU, wherein the inter-UE coordination information includes information related to a preferred resource or information related to a non-preferred resource, and wherein, in the LCP, a priority of the MAC CE for the inter-UE coordination information is lower than a priority of data from a sidelink control channel, SCCH, and a priority of a MAC CE for sidelink, SL, channel state information, CSI, reporting, and the priority of the MAC CE for the inter-UE coordination information is higher than a priority of data from a sidelink traffic channel, STCH.

According to a second aspect, we describe a processing device adapted to control a first device, the processing device comprising: one or more processors; and one or more memories operably connected to the one or more processors and storing instructions, wherein the one or more processors execute the instructions to: generate a medium access control, MAC, protocol data unit, PDU, including a MAC control element, CE, for inter-UE coordination information, based on logical channel prioritization, LCP; transmit, to a second device through a physical sidelink control channel, PSCCH, first sidelink control information, SCI, for scheduling of a physical sidelink shared channel, PSSCH, and second SCI, wherein the first SCI includes information related to frequency resource assignment, information related to time resource assignment and information related to a format of the second SCI; and transmit, to the second device through the PSSCH, the second SCI including a source ID and a destination ID, and the MAC PDU, wherein the inter-UE coordination information is included in the MAC CE for the inter-UE coordination information in the MAC PDU, wherein the inter-UE coordination information includes information related to a preferred resource or information related to a non-preferred resource, andwherein, in the LCP, a priority of the MAC CE for the inter-UE coordination information is lower than a priority of data from a sidelink control channel, SCCH, and a priority of a MAC CE for sidelink, SL, channel state information, CSI, reporting, and the priority of the MAC CE for the inter-UE coordination information is higher than a priority of data from a sidelink traffic channel, STCH.

According to a third aspect, we describe a non-transitory computer-readable storage medium storing instructions that, when executed, cause a first device to: generate a medium access control, MAC, protocol data unit, PDU, including a MAC control element, CE, for inter-UE coordination information, based on logical channel prioritization, LCP; transmit, to a second device through a physical sidelink control channel, PSCCH, first sidelink control information, SCI, for scheduling of a physical sidelink shared channel, PSSCH, and second SCI, wherein the first SCI includes information related to frequency resource assignment, information related to time resource assignment and information related to a format of the second SCI; and transmit, to the second device through the PSSCH, the second SCI including a source ID and a destination ID, and the MAC PDU, wherein the inter-UE coordination information is included in the MAC CE for the inter-UE coordination information in the MAC PDU, wherein the inter-UE coordination information includes information related to a preferred resource or information related to a non-preferred resource, andwherein, in the LCP, a priority of the MAC CE for the inter-UE coordination information is lower than a priority of data from a sidelink control channel, SCCH, and a priority of a MAC CE for sidelink, SL, channel state information, CSI, reporting, and the priority of the MAC CE for the inter-UE coordination information is higher than a priority of data from a sidelink traffic channel, STCH.

The UE can efficiently perform SL communication.

Figures describing non-claimed embodiments are not according to the present invention and are present for illustrative purposes only.

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". Accordingly, "A/B" may mean "only A", "only B": or "both A and B". 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".

In the following description, 'when, if, or in case of' may be replaced with 'based on'.

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

In the present disclosure, a higher layer parameter may be a parameter which is configured, pre-configured or pre-defined for a UE. For example, a base station or a network may transmit the higher layer parameter to the UE. For example, the higher layer parameter may be transmitted through radio resource control (RRC) signaling or medium access control (MAC) signaling.

For terms and techniques not specifically described among terms and techniques used in the present disclosure, reference may be made to a wireless communication standard document published before the present disclosure is filed. For example, the documents in Table <NUM> below may be referred to.

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 a SL channel or a 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 a 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 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 base station may schedule SL resource(s) to be used by a UE for SL transmission. For example, in step S600, a base station may transmit information related to SL resource(s) and/or information related to UL resource(s) to a first UE. For example, the UL resource(s) may include PUCCH resource(s) and/or PUSCH resource(s). For example, the UL resource(s) may be resource(s) for reporting SL HARQ feedback to the base station.

For example, the first UE may receive information related to dynamic grant (DG) resource(s) and/or information related to configured grant (CG) resource(s) from the base station. For example, the CG resource(s) may include CG type <NUM> resource(s) or CG type <NUM> resource(s). In the present disclosure, the DG resource(s) may be resource(s) configured/allocated by the base station to the first UE through a downlink control information (DCI). In the present disclosure, the CG resource(s) may be (periodic) resource(s) configured/allocated by the base station to the first UE through a DCI and/or an RRC message. For example, in the case of the CG type <NUM> resource(s), the base station may transmit an RRC message including information related to CG resource(s) to the first UE. For example, in the case of the CG type <NUM> resource(s), the base station may transmit an RRC message including information related to CG resource(s) to the first UE, and the base station may transmit a DCI related to activation or release of the CG resource(s) to the first UE.

In step S610, the first UE may transmit a PSCCH (e.g., sidelink control information (SCI) or <NUM>st-stage SCI) to a second UE based on the resource scheduling. In step S620, the first UE may transmit a PSSCH (e.g., <NUM>nd-stage SCI, MAC PDU, data, etc.) related to the PSCCH to the second UE. In step S630, the first UE may receive a PSFCH related to the PSCCH/PSSCH from the second UE. For example, HARQ feedback information (e.g., NACK information or ACK information) may be received from the second UE through the PSFCH. In step S640, the first UE may transmit/report HARQ feedback information to the base station through the PUCCH or the PUSCH. For example, the HARQ feedback information reported to the base station may be information generated by the first UE based on the HARQ feedback information received from the second UE. For example, the HARQ feedback information reported to the base station may be information generated by the first UE based on a pre-configured rule. For example, the DCI may be a DCI for SL scheduling. For example, a format of the DCI may be a DCI format 3_0 or a DCI format 3_1.

Referring to (b) of <FIG>, in the LTE transmission mode <NUM>, the LTE transmission mode <NUM>, or the NR resource allocation mode <NUM>, a UE may determine SL transmission resource(s) within SL resource(s) configured by a base station/network or pre-configured SL resource(s). For example, the configured SL resource(s) or the pre-configured SL resource(s) may be a resource pool. For example, the UE may autonomously select or schedule resource(s) for SL transmission. For example, the UE may perform SL communication by autonomously selecting resource(s) within the configured resource pool. For example, the UE may autonomously select resource(s) within a selection window by performing a sensing procedure and a resource (re)selection procedure. For example, the sensing may be performed in a unit of subchannel(s). For example, in step S610, a first UE which has selected resource(s) from a resource pool by itself may transmit a PSCCH (e.g., sidelink control information (SCI) or <NUM>st-stage SCI) to a second UE by using the resource(s). In step S620, the first UE may transmit a PSSCH (e.g., <NUM>nd-stage SCI, MAC PDU, data, etc.) related to the PSCCH to the second UE. In step S630, the first UE may receive a PSFCH related to the PSCCH/PSSCH from the second UE.

Referring to (a) or (b) of <FIG>, for example, the first UE may transmit a SCI to the second UE through the PSCCH. Alternatively, for example, the first UE may transmit two consecutive SCIs (e.g., <NUM>-stage SCI) to the second UE through the PSCCH and/or the PSSCH. In this case, the second UE may decode two consecutive SCIs (e.g., <NUM>-stage SCI) to receive the PSSCH from the first UE. In the present disclosure, a SCI transmitted through a PSCCH may be referred to as a <NUM>st SCI, a first SCI, a <NUM>st-stage SCI or a <NUM>st-stage SCI format, and a SCI transmitted through a PSSCH may be referred to as a <NUM>nd SCI, a second SCI, a <NUM>nd-stage SCI or a <NUM>nd-stage SCI format. For example, the <NUM>st-stage SCI format may include a SCI format <NUM>-A, and the <NUM>nd-stage SCI format may include a SCI format <NUM>-A and/or a SCI format <NUM>-B.

Table <NUM> shows an example of the <NUM>st-stage SCI format.

Table <NUM> shows an example of the <NUM>nd-stage SCI format.

Referring to (a) or (b) of <FIG>, in step S630, the first UE may receive the PSFCH. For example, the first UE and the second UE may determine a PSFCH resource, and the second UE may transmit HARQ feedback to the first UE using the PSFCH resource.

Referring to (a) of <FIG>, in step S640, the first UE may transmit SL HARQ feedback to the base station through the PUCCH and/or the PUSCH.

<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.

Meanwhile, an inter-UE coordination operation may be supported in NR V2X. For example, in inter-UE coordination, a UE-A may determine a set of resources, and the UE-A may transmit the set to a UE-B in the resource allocation mode <NUM>. In addition, the UE-B may consider the set for resource selection for its own transmission. For example, according to inter-UE coordination, the UE may inform other UEs of information related to preferred resource(s) or information related to non-preferred resource(s) (hereinafter, it is referred to as a candidate resource or a recommended resource) in the form of assistance information. For example, upon receiving information related to an excluding resource and/or a candidate resource, the UE may select its own transmission resource in consideration of the excluding resource and/or the candidate resource.

For example, in order to assist a sensing operation and/or a resource selection operation of a first UE, a second UE may transmit assistance information. The first UE may use the assistance information received from the second UE, in order to improve PSSCH detection performance and/or reduce half-duplex limit and/or select a reserve resource for transmitting and receiving a specific signal. In an embodiment of the present disclosure, for convenience of description, it is assumed that the UE-A transmits assistance information to the UE-B. It is assumed that the UE-B selects a resource for PSCCH/PSSCH to be transmitted to the UE-A and/or a resource for PSCCH/PSSCH to be transmitted to a UE-C (i.e., a third UE) based on the assistance information received from the UE-A.

<FIG> shows a procedure for a UE-A to transmit assistance information to a UE-B, based on an embodiment of the present disclosure.

Referring to <FIG>, in step S810, the UE-A may transmit assistance information to the UE-B. In step S820, the UE-B may select a resource for PSCCH/PSSCH based on the assistance information received from the UE-A. In step S830, the UE-B may perform SL transmission by using the resource. For example, the UE-B may select a resource for PSCCH/PSSCH to be transmitted to the UE-A based on the assistance information received from the UE-A, and the UE-B may perform SL transmission by using the resource. For example, the UE-B may select a resource for PSCCH/PSSCH to be transmitted to the UE-C based on the assistance information received from the UE-A, and the UE-B may perform SL transmission by using the resource. In step S840, the UE-A or the UE-C may perform SL reception on the resource determined based on the assistance information.

As described above, the UE-A may transmit information related to recommended resource(s) and/or candidate resource(s) to the UE-B, and the UE-B may select a transmission resource based on the received resource information. In this situation, in case that the UE-A transmits information related to excluding resource(s) and/or candidate resource(s) based on a coordination message, a method for efficiently transmitting the corresponding information and a device supporting the same may be required. For example, if the UE-A frequently transmits an inter-UE coordination message, the use of resources for the transmission may increase, and thus interference may occur. Furthermore, power consumption of the UE-A for the transmission may also occur. Furthermore, since the UE-A cannot perform reception while the UE-A transmits a message (due to a half-duplex problem), a problem in which reception efficiency of the UE-A deteriorates may occur. In the present disclosure, an efficient operation of the UE is defined based on this problem. In the present disclosure, the coordination message may be referred to by various terms such as an inter-UE coordination message, inter-UE coordination information, assistance information, a candidate message, etc. In the present invention, the term "inter-UE coordination information" is used.

Based on various embodiments of the present disclosure, a method for the UE-A and the UE-B to perform SL communication based on assistance information and a device supporting the same are proposed.

Based on an embodiment of the present disclosure, the UE-A may transmit an inter-UE coordination message for inter-UE coordination. For example, the message may include the following two types of information (e.g., excluding resource(s) and/or candidate resource(s)). For example, the UE-A may transmit the inter-UE coordination message to the UE-B through a physical layer signal or a higher layer signal. Herein, for example, for excluding resource(s) and/or candidate resource(s), resources may be configured separately. Or, for example, excluding resource(s) and/or candidate resource(s) may be configured by one resource (indication). If the resources are configured separately, information representing whether an indicated resource is an excluding resource or a candidate resource may be included/transmitted. Or, for example, whether an indicated resource is an excluding resource or a candidate resource may be recognized through information itself.

Based on an embodiment of the present disclosure, after the UE-A knows that the UE-B performs power saving (in unicast) (through a PC5 connection) or after the UE-B notifies the UE-A to perform a power saving operation, all or partial resource information of the UE-B may be transmitted. In this case, the UE-A may perform the following procedure.

Based on an embodiment of the present disclosure, when the UE-A performs transmission based on groupcast or broadcast (in groupcast or broadcast), if the UE-A determines that receiving UEs need to perform a power saving operation, the UE-A may perform the following operation.

For example, in the procedure in which the UE-A transmits the aforementioned inter-UE coordination message, if inter-UE coordination information transmitted by neighboring UEs is the same as information to be transmitted by the UE-A, the UE-A may save power by skipping (periodic or event-based) transmission.

<FIG> shows a procedure for a UE to perform SL communication based on assistance information, based on an embodiment of the present disclosure.

Referring to <FIG>, in step S910, the UE-B may receive SCI from the UE-A through a PSCCH. For example, the SCI may include information for scheduling a PSSCH. In step S920, the UE-B may receive assistance information from the UE-A through the PSSCH. For example, the assistance information may be included in a MAC PDU. For example, the assistance information may include information proposed in various embodiments of the present disclosure. In step S930, the UE-B may select an SL resource based on the assistance information.

In step S940, the UE-B may transmit a PSCCH and/or a PSSCH to the UE-C based on the selected SL resource. Alternatively/additionally, in step S950, the UE-B may transmit a PSCCH and/or a PSSCH to the UE-A based on the selected SL resource.

For example, first SCI transmitted in step S910 may include information representing that the assistance information is transmitted through the PSSCH in step S920. For example, the information representing that the assistance information is transmitted through the PSSCH may be transmitted based on a reserved bit included in the first SCI. For example, the information representing that the assistance information is transmitted through the PSSCH may be information related to a second SCI format included in the first SCI. Specifically, for example, second SCI having a specific format among a plurality of second SCI formats may be used to schedule transmission of assistance information.

For example, the second SCI transmitted in step S920 may include information representing that the assistance information is transmitted through the PSSCH in step S920.

Referring to <FIG>, in step S1010, the UE-A may transmit SCI to the UE-B through a PSCCH. For example, the SCI may include information for scheduling a PSSCH.

In step S1020, the UE-A may transmit first assistance information to the UE-B through a PSSCH. For example, the first assistance information may be included in a MAC PDU. For example, the first assistance information may include information proposed in various embodiments of the present disclosure. For example, the first assistance information may include information related to excluding resource(s) and/or candidate resource(s). For example, the candidate resource may be a resource which is preferred by the UE-A. For example, the excluding resource may be a resource which is not preferred by the UE-A. For example, the candidate resource may be a resource which is preferred by the UE-C. For example, the excluding resource may be a resource which is not preferred by the UE-C. For example, the UE-B may receive information related to resource(s) preferred by other UEs (i.e., candidate resource(s)) and/or information related to resource(s) not preferred by other UEs (i.e., excluding resource(s)) from the UE-A.

In step S1030, the UE-B may select an SL resource based on the first assistance information. For example, in case that the UE-B operates in a power saving mode, the UE-B that has received the inter-UE coordination message may perform the following operation.

In step S1040, the UE-B may determine whether to request assistance information. For example, the UE-B may determine whether to request additional assistance information. For example, if resource reselection is performed after the UE-B receives the inter-UE coordination message, step S1050 may be performed.

In step S1050, the UE-B may inform that resource reselection has been performed. For example, the UE-B may request (re)transmission of an inter-UE coordination message. For example, the UE-B may transmit information for requesting (re)transmission of an inter-UE coordination message to the UE-A.

For example, if the UE-A receives the request from the UE-B or resource reselection is performed, the UE-A may perform the following procedure.

In step S1080, the UE-B may select an SL resource based on the first assistance information and/or the second assistance information. In addition, the UE-B may transmit a PSCCH and/or a PSSCH to the UE-A or the UE-C based on the SL resource.

Meanwhile, the proposed inter-UE coordination message may be a message including coordination information (e.g., resource information, channel state information, etc.) to be newly applied by the counterpart UE which has received the message. For example, the inter-UE coordination message may be a PC5 RRC message. In this case, the inter-UE coordination message may be transmitted through PC5 RRC signaling. For example, the inter-UE coordination message may be a MAC CE message. In this case, the inter-UE coordination message may be transmitted through a MAC CE. Accordingly, the inter-UE coordination message may have an SL priority different from that of a PC5 RRC message, a MAC CE message, and/or SL data for other purposes used in SL communication.

As described above, an inter-UE coordination message may be transmitted by being included in a medium access control (MAC) service data unit (SDU) or a MAC control element (CE) within a MAC protocol data unit (PDU). For example, in case that the inter-UE coordination message is included in the MAC CE, since the MAC CE does not have a mapping logical channel (e.g., sidelink traffic channel (STCH), sidelink control channel (SCCH)), a problem in which a priority of the MAC CE is ambiguous may occur when the UE includes the MAC CE for the inter-UE coordination message in the MAC PDU based on a logical channel prioritization (LCP) procedure. For example, in case that the inter-UE coordination message is included in the MAC SDU, since a logical channel (e.g., sidelink traffic channel (STCH), sidelink control channel (SCCH)) to which the inter-UE coordination message is mapped is not currently defined, a problem in which a priority of the MAC SDU is ambiguous may occur when the UE includes the MAC SDU for the inter-UE coordination message in the MAC PDU based on a logical channel prioritization (LCP) procedure. As described above, if a priority related to the inter-UE coordination message is not clearly defined, the UE cannot perform the LCP procedure for generating the MAC PDU.

Therefore, based on various embodiments of the present disclosure, when UEs transmit the inter-UE coordination message to perform an inter-UE coordination operation in NR V2X communication, the inter-UE coordination message may have a different priority from other sidelink messages (e.g., PC5 RRC message, MAC CE, and SL data). To this end, a method of newly defining a logical channel (LCH) priority of an inter-UE coordination message and performing sidelink logical channel prioritization (SL LCP) based on the newly defined LCH priority of the inter-UE coordination message, and device(s) supporting the same are proposed. Hereinafter, an SL LCH priority and an LCP operation method of an inter-UE coordination message will be described in detail.

In the present disclosure, for an LCP operation of the UE (e.g., MAC entity) for an inter-UE coordination message, an SL priority (or SL LCH priority) of the inter-UE coordination message may be defined as follows.

For example, the SL priority of the inter-UE coordination message may be defined as shown in Table <NUM>. For example, priorities may be described in following order, with the highest priority listed first. That is, in the embodiment of Table <NUM>, data from SCCH may have the highest priority. For example, in the embodiment of Table <NUM>, it is assumed that an inter-UE coordination message is transmitted through a MAC CE (i.e., by being included in the MAC CE).

For example, an SL priority of an inter-UE coordination message may be defined as shown in Table <NUM>. For example, priorities may be described in following order, with the highest priority listed first. That is, in the embodiment of Table <NUM>, data from SCCH may have the highest priority. For example, in the embodiment of Table <NUM>, it is assumed that an inter-UE coordination message is transmitted through a MAC CE (i.e., by being included in the MAC CE).

For example, an SL priority of an inter-UE coordination message may be defined as shown in Table <NUM>. For example, priorities may be described in following order, with the highest priority listed first. That is, in the embodiment of Table <NUM>, data from SCCH may have the highest priority. For example, in the embodiment of Table <NUM>, it is assumed that an inter-UE coordination message is transmitted through PC5 RRC signaling (i.e., by being included in a PC5 RRC message).

Based on an embodiment of the present disclosure, the UE may perform an LCP operation as follows based on an LCH priority of an inter-UE coordination message proposed above. For example, if the UE (e.g., MAC entity) has at least one MAC SDU and at least one MAC CE for new transmission, the UE may generate a MAC PDU by selecting MAC SDUs or MAC CEs in the order of destinations having the highest LCH priority (i.e., based on/according to the descending order of the SL LCH priorities). For example, if the UE (e.g., MAC entity) has at least one MAC SDU and at least one MAC CE as below, the UE may perform an LCP operation (e.g., an operation of generating a MAC PDU) based on an LCH priority of an inter-UE coordination message proposed in the present disclosure as follows.

It is assumed that the UE (e.g., MAC entity) has at least one MAC SDU and at least one MAC CE as follows. The highest priority may be listed first.

Based on an SL priority (or an SL LCH priority) of an inter-UE coordination MAC CE message proposed in the present disclosure, the UE (e.g., MAC entity) may first fill a MAC PDU with an SDU for data from SCCH. If space remains in the MAC PDU even after filling the SDU for data from SCCH into the MAC PDU, the UE (e.g., MAC entity) may fill the MAC PDU in the order of an inter-UE coordination MAC CE message and an SL CSI reporting MAC CE. If one MAC PDU cannot be filled with both the MAC SDU and the MAC CE (i.e., data from SCCH, inter-UE coordination MAC CE message, SL CSI reporting MAC CE), the UE may fill the MAC PDU with the MAC SDU and the MAC CE in the order of SL priorities proposed in the present disclosure.

Embodiment <NUM> is an embodiment for a case where an SL priority of an inter-UE coordination MAC CE message is higher than an SL priority of an SL CSI reporting MAC CE. If the proposal configuring the SL priority of the SL CSI reporting MAC CE higher than the SL priority of the inter-UE coordination MAC CE message is applied, when the UE (e.g., MAC entity) generates a MAC PDU, the UE may generate the MAC PDU by first including the SL CSI reporting MAC CE in the MAC PDU rather than the inter-UE coordination MAC CE message.

Based on an SL priority (or an SL LCH priority) of an inter-UE coordination MAC CE message proposed in the present disclosure, the UE (e.g., MAC entity) may first fill a MAC PDU with an inter-UE coordination MAC CE message. If space remains in the MAC PDU even after filling the MAC CE message in the MAC PDU, the UE (e.g., MAC entity) may fill the MAC PDU in the order of an SL CSI reporting MAC CE and a MAC SDU for data from STCH. If one MAC PDU cannot be filled with both the MAC CE and the MAC SDU (i.e., inter-UE coordination MAC CE message, SL CSI reporting MAC CE, data from STCH), the UE may fill the MAC PDU with the MAC CE and the MAC SDU in the order of SL priorities proposed in the present disclosure.

Based on an SL priority (or an SL LCH priority) of an inter-UE coordination PC5 RRC message proposed in the present disclosure, the UE (e.g., MAC entity) may first fill a MAC PDU with an SDU for data from SCCH. If space remains in the MAC PDU even after filling the SDU for data from SCCH into the MAC PDU, the UE (e.g., MAC entity) may fill the MAC PDU in the order of an SL CSI reporting MAC CE and data from any STCH. If one MAC PDU cannot be filled with both the MAC SDU and the MAC CE (i.e., data from SCCH including inter-UE coordination PC5 RRC message, SL CSI reporting MAC CE, data from any STCH), the UE may fill the MAC PDU with the MAC SDU and the MAC CE in the order of SL priorities proposed in the present disclosure.

In addition, based on the SL priority value of the inter-UE coordination message proposed in the present disclosure, the UE may perform UL/SL prioritization (e.g., an operation of determining transmission priority when the UE needs to simultaneously perform uplink transmission and sidelink transmission).

Based on an embodiment of the present disclosure, in case that the UE transmits an inter-UE coordination message, a destination layer <NUM> ID included in a MAC header may be newly proposed. For example, an independent layer <NUM> ID for distinguishing transmission of the inter-UE coordination message only may be newly defined. For example, according to the prior art, a destination layer <NUM> ID for a broadcast message, a destination layer <NUM> ID for a groupcast message, and a destination layer <NUM> ID for a unicast message are separately defined. Also, according to the prior art, when multiplexing a MAC PDU, multiplexing (MUX) is supported only for the same cast type. That is, unicast data/messages may only be multiplexed with unicast data/messages, and groupcast data/messages may only be multiplexed with groupcast data/messages, and broadcast data/messages may only be multiplexed with broadcast data/messages. In the present disclosure, an independent destination layer <NUM> ID only for the inter-UE coordination message may be defined. That is, based on an embodiment of the present disclosure, when the UE (e.g., MAC entity) performs multiplexing of a MAC PDU, the UE may perform multiplexing only for inter-UE coordination messages. That is, other MAC PDUs other than the inter-UE coordination message and the inter-UE coordination message may not be multiplexed into the same MAC PDU. In addition, an independent destination layer <NUM> ID only for the inter-UE coordination message may be a common destination layer <NUM> ID regardless of broadcast/groupcast/unicast. For example, the UE may perform broadcast/groupcast/unicast by using a common destination layer <NUM> ID. Or, an independent destination layer <NUM> ID only for the inter-UE coordination message may be defined as an individual destination layer <NUM> ID separately divided into broadcast/groupcast/unicast. That is, for example, in order to transmit the inter-UE coordination message in unicast, the UE may use a unicast destination layer <NUM> ID for the inter-UE coordination message. For example, in order to transmit the inter-UE coordination message in groupcast, the UE may use a groupcast destination layer <NUM> ID for the inter-UE coordination message. For example, in order to transmit the inter-UE coordination message in broadcast, the UE may use a broadcast destination layer <NUM> ID for the inter-UE coordination message.

Based on an embodiment of the present disclosure, the UE may transmit an inter-UE coordination message by using a unicast destination layer <NUM> ID, a groupcast destination layer <NUM> ID, or a broadcast layer <NUM> ID equally used in the prior art (e.g., release <NUM> NR V2X). Meanwhile, if the UE transmits an inter-UE coordination message by using a conventional destination layer <NUM> ID (for unicast/groupcast/broadcast), the UE which has received the corresponding message cannot distinguish whether the message is an inter-UE coordination message or not. Therefore, based on an embodiment of the present disclosure, an identifier for identification may be included in SCI to indicate that a PSSCH associated with the corresponding SCI is an inter-UE coordination message. For example, the transmitting UE which transmits an inter-UE coordination message may indicate/inform the receiving UE that an inter-UE coordination message is transmitted through a PSSCH related to SCI, by using the SCI. Through this, even if the transmitting UE transmits an inter-UE coordination message by using a unicast destination layer <NUM> ID, a groupcast destination layer <NUM> ID, or a broadcast layer <NUM> ID equally used in the prior art (e.g., release <NUM> NR V2X), the receiving UE which has received the message can distinguish that the corresponding message is an inter-UE coordination message based on the SCI.

For example, the SCI may be first SCI transmitted through a PSCCH. For example, the SCI may be second SCI transmitted through a PSCCH. For example, transmission of an inter-UE coordination message may be explicitly indicated by the SCI. That is, the SCI may include information indicating transmission of the inter-UE coordination message. Alternatively, for example, transmission of the inter-UE coordination message may be implicitly indicated by the SCI. For example, based on the format information of the second SCI included in the first SCI, transmission of the inter-UE coordination message may be implicitly indicated by the first SCI. In this case, the format of the second SCI for the inter-UE coordination message may be configured/defined separately.

Based on various embodiments of the present disclosure, in case that the UE (e.g., MAC entity) has at least one MAC CE, at least one MAC SDU, and at least one inter-UE coordination MAC CE message to be transmitted to destination UEs, the UE (e.g., MAC entity) can select the destination SDU or the destination MAC CE having the highest LCH priority based on the SL priority (or SL LCH priority) order proposed in the present disclosure, the UE can generate a MAC PDU based on this. Furthermore, the receiving UE can efficiently identify and receive an inter-UE coordination message.

Whether or not the (some) proposed method/rule of the present disclosure is applied or not and/or the related parameter (e.g., threshold) may be configured specifically (or differently or independently) based on a resource pool, a congestion level, a service priority (and/or type), a requirement (e.g., latency, reliability), a traffic type (e.g., (a)periodic generation), an SL mode, etc..

<FIG> shows a method for performing wireless communication by a first device, based on an embodiment of the present invention.

Referring to <FIG>, in step S1110, the first device transmits, to a second device through a physical sidelink control channel (PSCCH), first sidelink control information (SCI) for scheduling of a physical sidelink shared channel (PSSCH) and second SCI. The first SCI includes information related to frequency resource assignment, information related to time resource assignment and information related to a format of the second SCI. In step S1120, the first device transmits, to the second device through the PSSCH, the second SCI including a source ID and a destination ID and an inter-UE coordination message. The inter-UE coordination message includes information related to a preferred resource or information related to a non-preferred resource, and information representing that the inter-UE coordination message is transmitted may be included in the first SCI or the second SCI.

Additionally, the first device generates based on logical channel prioritization (LCP), a medium access control (MAC) protocol data unit (PDU) including the inter-UE coordination message.

The inter-UE coordination message is included in a MAC control element (CE) for the inter-UE coordination message in the MAC PDU. A priority of the MAC CE for the inter-UE coordination message is lower than a priority of data from a sidelink control channel (SCCH) and higher than a priority of data from a sidelink traffic channel (STCH). The priority of the MAC CE for the inter-UE coordination message is lower than a priority of a MAC CE for sidelink (SL) channel state information (CSI) reporting. In a non-claimed example, the priority of the MAC CE for the inter-UE coordination message may be higher than a priority of a MAC CE for sidelink (SL) channel state information (CSI) reporting.

For example, the inter-UE coordination message may be included in a MAC service data unit (SDU) for the inter-UE coordination message in the MAC PDU. For example, a priority of the inter-UE coordination message may be a priority of data from a sidelink control channel (SCCH). For example, a priority of the inter-UE coordination message may be higher than a priority of a MAC control element (CE) for sidelink (SL) channel state information (CSI) reporting and higher than a priority of data from a sidelink traffic channel (STCH).

For example, the information included in the first SCI may represent that the inter-UE coordination message is transmitted through the PSSCH.

For example, the information included in the second SCI may represent that the inter-UE coordination message is transmitted through the PSSCH.

For example, the information related to the format of the second SCI may represent a format of the second SCI related to the inter-UE coordination message.

For example, the destination ID may represent that the inter-UE coordination message is transmitted.

The proposed method can be applied to the device(s) based on various embodiments of the present disclosure. First, the processor <NUM> of the first device <NUM> controls the transceiver <NUM> to transmit, to a second device through a physical sidelink control channel (PSCCH), first sidelink control information (SCI) for scheduling of a physical sidelink shared channel (PSSCH) and second SCI. The first SCI includes information related to frequency resource assignment, information related to time resource assignment and information related to a format of the second SCI. In addition, the processor <NUM> of the first device <NUM> controls the transceiver <NUM> to transmit, to the second device through the PSSCH, the second SCI including a source ID and a destination ID and an inter-UE coordination message. The inter-UE coordination message includes information related to a preferred resource or information related to a non-preferred resource, and information representing that the inter-UE coordination message is transmitted may be included in the first SCI or the second SCI.

Based on a non-claimed embodiment of the present disclosure, a first device adapted 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: transmit, to a second device through a physical sidelink control channel (PSCCH), first sidelink control information (SCI) for scheduling of a physical sidelink shared channel (PSSCH) and second SCI, wherein the first SCI includes information related to frequency resource assignment, information related to time resource assignment and information related to a format of the second SCI; and transmit, to the second device through the PSSCH, the second SCI including a source ID and a destination ID and an inter-UE coordination message. For example, the inter-UE coordination message may include information related to a preferred resource or information related to a non-preferred resource, and information representing that the inter-UE coordination message is transmitted may be included in the first SCI or the second SCI.

Based on an embodiment of the present invention, an apparatus adapted to control a first user equipment (UE) is provided. The apparatus may comprise: one or more processors; and one or more memories operably connected to the one or more processors and storing instructions. The one or more processors execute the instructions to: transmit, to a second UE through a physical sidelink control channel (PSCCH), first sidelink control information (SCI) for scheduling of a physical sidelink shared channel (PSSCH) and second SCI, wherein the first SCI includes information related to frequency resource assignment, information related to time resource assignment and information related to a format of the second SCI; and transmit, to the second UE through the PSSCH, the second SCI including a source ID and a destination ID and an inter-UE coordination message. The inter-UE coordination message includes information related to a preferred resource or information related to a non-preferred resource, and information representing that the inter-UE coordination message is transmitted may be included in the first SCI or the second SCI.

Based on an embodiment of the present invention, a non-transitory computer-readable storage medium storing instructions is provided. The instructions, when executed, cause a first device to: transmit, to a second device through a physical sidelink control channel (PSCCH), first sidelink control information (SCI) for scheduling of a physical sidelink shared channel (PSSCH) and second SCI, wherein the first SCI includes information related to frequency resource assignment, information related to time resource assignment and information related to a format of the second SCI; and transmit, to the second device through the PSSCH, the second SCI including a source ID and a destination ID and an inter-UE coordination message. The inter-UE coordination message includes information related to a preferred resource or information related to a non-preferred resource, and information representing that the inter-UE coordination message is transmitted may be included in the first SCI or the second SCI.

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

Referring to <FIG>, in step S1210, the second device may receive, from a first device through a physical sidelink control channel (PSCCH), first sidelink control information (SCI) for scheduling of a physical sidelink shared channel (PSSCH) and second SCI. For example, the first SCI may include information related to frequency resource assignment, information related to time resource assignment and information related to a format of the second SCI. In step S1220, the second device may receive, from the first device through the PSSCH, the second SCI including a source ID and a destination ID and an inter-UE coordination message. For example, the inter-UE coordination message may include information related to a preferred resource or information related to a non-preferred resource, and information representing that the inter-UE coordination message is transmitted may be included in the first SCI or the second SCI.

The proposed method can be applied to the device(s) based on various embodiments of the present disclosure. First, the processor <NUM> of the second device <NUM> may control the transceiver <NUM> to receive, from a first device through a physical sidelink control channel (PSCCH), first sidelink control information (SCI) for scheduling of a physical sidelink shared channel (PSSCH) and second SCI. For example, the first SCI may include information related to frequency resource assignment, information related to time resource assignment and information related to a format of the second SCI. In addition, the processor <NUM> of the second device <NUM> may control the transceiver <NUM> to receive, from the first device through the PSSCH, the second SCI including a source ID and a destination ID and an inter-UE coordination message. For example, the inter-UE coordination message may include information related to a preferred resource or information related to a non-preferred resource, and information representing that the inter-UE coordination message is transmitted may be included in the first SCI or the second SCI.

Based on an embodiment of the present disclosure, a second device adapted 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: receive, from a first device through a physical sidelink control channel (PSCCH), first sidelink control information (SCI) for scheduling of a physical sidelink shared channel (PSSCH) and second SCI, wherein the first SCI includes information related to frequency resource assignment, information related to time resource assignment and information related to a format of the second SCI; and receive, from the first device through the PSSCH, the second SCI including a source ID and a destination ID and an inter-UE coordination message. For example, the inter-UE coordination message may include information related to a preferred resource or information related to a non-preferred resource, and information representing that the inter-UE coordination message is transmitted may be included in the first SCI or the second SCI.

Based on an embodiment of the present disclosure, an apparatus adapted 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: receive, from a first UE through a physical sidelink control channel (PSCCH), first sidelink control information (SCI) for scheduling of a physical sidelink shared channel (PSSCH) and second SCI, wherein the first SCI includes information related to frequency resource assignment, information related to time resource assignment and information related to a format of the second SCI; and receive, from the first UE through the PSSCH, the second SCI including a source ID and a destination ID and an inter-UE coordination message. For example, the inter-UE coordination message may include information related to a preferred resource or information related to a non-preferred resource, and information representing that the inter-UE coordination message is transmitted may be included in the first SCI or the second SCI.

Based on an embodiment of the present disclosure, a non-transitory computer-readable storage medium storing instructions may be provided. For example, the instructions, when executed, may cause a second device to: receive, from a first device through a physical sidelink control channel (PSCCH), first sidelink control information (SCI) for scheduling of a physical sidelink shared channel (PSSCH) and second SCI, wherein the first SCI includes information related to frequency resource assignment, information related to time resource assignment and information related to a format of the second SCI; and receive, from the first device through the PSSCH, the second SCI including a source ID and a destination ID and an inter-UE coordination message. For example, the inter-UE coordination message may include information related to a preferred resource or information related to a non-preferred resource, and information representing that the inter-UE coordination message is transmitted may be included in the first SCI or the second SCI.

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. The embodiment of <FIG> may be combined with various embodiments of the present disclosure.

Claim 1:
A method for performing wireless communication by a first device (<NUM>), the method comprising:
generating a medium access control, MAC, protocol data unit, PDU, including a MAC control element, CE, for inter-UE coordination information, based on logical channel prioritization, LCP;
transmitting (S1110), to a second device through a physical sidelink control channel, PSCCH, first sidelink control information, SCI, for scheduling of a physical sidelink shared channel, PSSCH, and second SCI, wherein the first SCI includes information related to frequency resource assignment, information related to time resource assignment and information related to a format of the second SCI; and
transmitting (S1120), to the second device through the PSSCH, the second SCI including a source ID and a destination ID, and the MAC PDU,
wherein the inter-UE coordination information is included in the MAC CE for the inter-UE coordination information in the MAC PDU,
wherein the inter-UE coordination information includes information related to a preferred resource or information related to a non-preferred resource, and
wherein, in the LCP, a priority of the MAC CE for the inter-UE coordination information is lower than a priority of data from a sidelink control channel, SCCH, and a priority of a MAC CE for sidelink, SL, channel state information, CSI, reporting, and the priority of the MAC CE for the inter-UE coordination information is higher than a priority of data from a sidelink traffic channel, STCH.