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.

<NPL>" introduces the support of Rel17 features for SL DRX and resource allocation enhancements.

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".

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 this specification, a wireless communication standard document published before the present specification is filed 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.

When an RRC connection is established between an RRC layer of the UE and an RRC layer of the E-UTRAN, the UE is in an RRC _CONNECTED state, and, otherwise, the UE may be in an RRC_IDLE state. In case of the NR, an RRC_INACTIVE state is additionally defined, and a UE being in the RRC _INACTIVE state may maintain its connection with a core network whereas its connection with the BS is released.

<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 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 1st-stage SCI) to a second UE based on the resource scheduling. In step S620, the first UE may transmit a PSSCH (e.g., 2nd-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 1st-stage SCI) to a second UE by using the resource(s). In step S620, the first UE may transmit a PSSCH (e.g., 2nd-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 1st SCI, a first SCI, a 1st-stage SCI or a 1st-stage SCI format, and a SCI transmitted through a PSSCH may be referred to as a 2nd SCI, a second SCI, a 2nd-stage SCI or a 2nd-stage SCI format. For example, the 1st-stage SCI format may include a SCI format <NUM>-A, and the 2nd-stage SCI format may include a SCI format <NUM>-A and/or a SCI format <NUM>-B.

Hereinafter, an example of SCI format <NUM>-A will be described.

SCI format <NUM>-A is used for the scheduling of PSSCH and 2nd-stage-SCI on PSSCH.

The following information is transmitted by means of the SCI format <NUM>-A:.

SCI format <NUM>-A is used for the decoding of PSSCH, with HARQ operation when HARQ-ACK information includes ACK or NACK, when HARQ-ACK information includes only NACK, or when there is no feedback of HARQ-ACK information.

Hereinafter, an example of SCI format <NUM>-B will be described.

SCI format <NUM>-B is used for the decoding of PSSCH, with HARQ operation when HARQ-ACK information includes only NACK, or when there is no feedback of HARQ-ACK information.

The following information is transmitted by means of the SCI format <NUM>-B:.

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.

Hereinafter, a UE procedure for determining a subset of resources to be reported to a higher layer in PSSCH resource selection in sidelink resource allocation mode <NUM> will be described.

In resource allocation mode <NUM>, a higher layer may request a UE to determine a subset of resources, from which the higher layer will select a resource for PSSCH/PSCCH transmission. To trigger this procedure, in slot n, a higher layer provides the following parameters for a PSSCH/PSCCH transmission.

Following higher layer parameters affect this procedure:.

The resource reservation interval, Prsvp_TX, if provided, is converted from units of msec to units of logical slots, resulting in P'rsvp_TX.

<MAT> denotes the set of slots which belongs to the sidelink resource pool.

For example, a UE may select a set of candidate resources (SA) based on Table <NUM>. For example, when resource (re)selection is triggered, a UE may select a candidate resource set (SA) based on Table <NUM>. For example, when re-evaluation or pre-emption is triggered, a UE may select a candidate resource set (SA) based on Table <NUM>.

Meanwhile, partial sensing may be supported for power saving of a UE. For example, in LTE SL or LTE V2X, a UE may perform partial sensing based on Tables <NUM> and <NUM>.

<FIG> shows three cast types, in accordance with an embodiment of the present disclosure. Specifically, <FIG> shows broadcast-type SL communication, <FIG> shows unicast type-SL communication, and <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.

In this specification, the "configure or define" wording may be interpreted as being (pre)configured (via pre-defined signaling (e.g., SIB, MAC signaling, RRC signaling)) from a base station or a network. For example, "A may be configured" may include "that a base station or network (pre-)configures/defines or informs A for a UE". Alternatively, the wording "configure or define" may be interpreted as being configured or defined in advance by a system. For example, "A may be configured" may include "A is configured/defined in advance by a system".

Referring to the standard document, some procedures and technical specifications related to the present disclosure are as follows.

Meanwhile, in Release <NUM> NR sidelink (SL) operation, SL DRX operation will be newly supported. In the embodiment(s) of the present disclosure, an SL DRX command MAC CE operation method is proposed. In the following description, 'when, if, in case of may be replaced with 'based on'.

In addition, in the embodiment(s) of the present disclosure, a method for transferring recommended (or preferred) transmission resource information or assistance information for transmission resource selection for a UE performing an SL DRX operation to a counterpart UE through an inter UE coordination (IUC) MAC CE is proposed.

In addition, in the embodiment (s) of the present disclosure, when UEs transmit an IUC message to perform an IUC operation in NR V2X communication, logical channel (LCH) priority of an IUC message is newly defined so that the IUC message has a different priority from other sidelink messages (PC5 RRC message, MAC CE, SL Data), and an SL logical channel prioritization (LCP) operation based on the LCH priority of the newly defined IUC message is proposed. In the following description, 'when, if, in case of may be replaced with 'based on'.

According to an embodiment of the present disclosure, when UE-B (SL data transmitting UE) receives an IUC MAC CE from UE-A (UE transmitting the IUC MAC CE), UE-B may select a resource for SL data transmission by referring to the received IUC MAC CE information. In addition, UE-B may request transmission of an IUC MAC from UE-A by transmitting an IUC request MAC CE requesting IUC MAC transmission. For example, upon receiving the IUC request MAC CE from UE-B, UE-A may transmit an IUC MAC CE to UE-B.

For example, in the present disclosure, an IUC MAC CE refers to a MAC CE including IUC information (e.g., including preferred/non-preferred recommendation resource information), an IUC request MAC CE may refer to a MAC CE requesting an IUC MAC CE.

According to an embodiment of the present disclosure, a priority order of IUC messages and an LCP operation method may be provided.

In the present disclosure, the SL priority (or SL LCH priority) of an IUC message is defined as follows for an LCP operation of a MAC entity for an IUC message.

The following shows the SL priority of an IUC message. They are displayed in order of highest priority, i.e., data from SCCH may have the highest priority.

In the present disclosure, an LCP operation may be performed as follows according to the LCH priority of an IUC message proposed above.

For example, if a MAC entity of a UE has a plurality of MAC SDUs and MAC CEs for new transmission, the MAC entity may configure a MAC PDU by selecting a MAC SDU or a MAC CE in the order of a destination having the highest LCH priority (that is, according to the descending order of the SL LCH priorities or based on the descending order of the SL LCH priorities. For example, if a MAC entity of a UE has a plurality of MAC SDUs and MAC CEs as follows, the MAC entity may perform an LCP operation (an operation of generating a MAC PDU) according to the LCH priority of the IUC MAC CE proposed in the present disclosure as follows.

For example, a MAC entity of a UE may have a plurality of MAC SDUs and MAC CEs as follows.

For example, according to the SL priority (or SL LCH priority) of an IUC MAC CE message proposed in this disclosure, a MAC entity can first fill a MAC PDU with the SDU for data from the SCCH. After filling the MAC PDU with the SDU for data from the SCCH, if space remains in the MAC PDU, the MAC entity can fill the MAC PDU with the IUC MAC CE message and the SL CSI reporting MAC CE in order. If all MAC SDUs and MAC CEs (data from SCCH, IUC MAC CE message, SL CSI reporting MAC CE) are not filled in one MAC PDU, the MAC entity may fill the MAC SDU and MAC CE into the MAC PDU in the order of SL priority proposed in the present disclosure. That is, a MAC PDU can be filled as much as possible in descending order of SL priority order.

For example, in Embodiment <NUM> is an embodiment where the SL priority of an IUC MAC CE message is higher than an SL CSI reporting MAC CE. If a proposal where the SL priority of an SL CSI reporting MAC CE is set to be higher than an IUC MAC CE message is applied, when a MAC entity configures a MAC PDU, the MAC PDU may be generated by first including the SL CSI reporting MAC CE in the MAC PDU rather than the IUC MAC CE message.

For example, according to the SL priority (or SL LCH priority) of an IUC MAC CE message proposed in the present disclosure, a MAC entity may first fill a MAC PDU with the IUC MAC CE message. If space remains in a MAC PDU after filling the MAC PDU with an IUC MAC CE message, the MAC entity may sequentially fill the MAC PDU with an SL CSI MAC CE and an MAC SDU for data from an STCH. If one MAC PDU cannot be filled with all MAC CEs and MAC SDUs (IUC MAC CE message, SL CSI reporting MAC CE, data from STCH), the MAC entity may fill the MAC PDU with the MAC CE and the MAC SDU in the order of SL priority proposed in the present disclosure.

For example, the Embodiment <NUM> is an embodiment where the SL priority of an IUC MAC CE message is higher than that of an SL CSI reporting MAC CE. If a proposal where the SL priority of an SL CSI reporting MAC CE is set to be higher than an IUC MAC CE message is applied, when a MAC entity configures a MAC PDU, the MAC PDU may be generated by first including the SL CSI reporting MAC CE in the MAC PDU rather than the IUC MAC CE message.

According to an embodiment of the present disclosure, if a MAC entity of a UE has multiple MAC CEs, MAC SDUs, and IUC MAC CE messages to be transmitted to destination UEs, a method of configuring a MAC PDU by the MAC entity selecting a destination SDU or a destination MAC CE having the highest LCH priority based on the SL priority (or SL LCH priority) order proposed in this disclosure has been proposed.

For example, Embodiments <NUM> and <NUM> are each only just one embodiment, a UE may perform an operation of configuring or generating a MAC PDU according to various priority sequences for an IUC MAC CE proposed in the present disclosure.

According to an embodiment of the present disclosure, the following order of priority is also proposed.

For example, the following shows the SL priority of an IUC message. They are displayed in order of highest priority, that is, data from SCCH may have the highest priority.

<FIG> shows a procedure for a second UE to select a transmission resource based on IUC information according to an embodiment of the present disclosure.

Referring to <FIG>, a first UE reporting IUC information based on an IUC request and a second UE transmitting an IUC request to select a transmission resource are represented. In step S810, a second UE may transmit an IUC request to a first UE. For example, the IUC request may include an IUC request MAC CE. In step S820, the first UE triggers an IUC information reporting procedure based on reception of the IUC request. For example, the IUC reporting procedure may be the request-based IUC information reporting procedure described in the present disclosure.

In step S830, the first UE generates a MAC PDU for reporting IUC information. Here, the first UE generates the MAC PDU based on an LCP procedure. Here, for example, the LCP procedure may be performed based on priorities between MAC SDUs and MAC CEs described in this disclosure. For example, when a plurality of MAC SDUs and MAC CEs to be transmitted are pending, they may be included in the MAC PDU in order of highest priority. For example, an IUC reporting MAC CE may have the highest priority, next, the priority of data from SCCH may be high, next, the priority of an SL SCI reporting MAC CE may be high, next, the priority of an SL DRX command MAC CE may be high, and next, the priority of data from STCH may be high. In this embodiment, it is assumed that the IUC reporting MAC CE is included in the MAC PDU as a result of the LCP procedure.

In step S840, the first UE transmits the generated MAC PDU to the second UE. That is, the first UE performs IUC report. For example, the IUC report MAC CE may include information related to a preferred resource set and/or a non-preferred resource set of the first UE. In step S850, the second UE may select a transmission resource based on the received IUC report, that is, the IUC report MAC CE included in the MAC PDU. Thereafter, the second UE may perform SL communication with the first UE based on the selected transmission resource. Here, since the preferred resource set and/or the non-preferred resource set are considered in the transmission resource selection, SL communication between the first UE and the second UE can be performed more smoothly.

<FIG> shows an embodiment in which a MAC PDU is generated based on an LCP procedure according to an embodiment of the present disclosure.

Referring to <FIG>, the priority order between MAC CE and MAC SDU proposed in this disclosure is shown. Also, an example of generating a MAC PDU is shown. For example, an IUC reporting MAC CE may have the highest priority, next, the priority of data from SCCH may be high, next, the priority of an SL SCI reporting MAC CE may be high, next, the priority of an SL DRX command MAC CE may be high, and next, the priority of data from STCH may be high.

Among the portions showing the priority order on the left side of <FIG>, blocks with solid lines represent MAC CEs or MAC SDUs that are pending to be included in MAC PDUs in a MAC entity. That is, in this embodiment, it is assumed that the IUC reporting MAC CE, SL SCI reporting MAC CE, and SL DRX command MAC CE are pending in the MAC entity.

Referring to the right side of <FIG>, a MAC PDU is shown, and the horizontal length of the MAC PDU block represents the space of the MAC PDU described in this disclosure. That is, it can be interpreted that the space of the MAC PDU is insufficient to include all of the IUC report MAC CE, SL SCI report MAC CE, and SL DRX command MAC CE in the MAC PDU. Here, according to an LCP procedure, the MAC entity includes to a MAC PDU in the order of highest priority, and when there is insufficient space, it can generate the MAC PDU without including MAC CEs or MAC SDUs with low priorities. That is, in this embodiment, since the remaining space of the MAC PDU is insufficient to include the SL DRX command MAC CE having the lowest priority among MAC CEs or MAC SDUs pending in the MAC entity, the MAC entity may generate a MAC PDU by including only the IUC reporting MAC CE and the SL SCI reporting MAC CE.

UL/SL prioritization may be performed based on the SL priority value (or order) of an IUC message proposed in this disclosure. For example, the prioritization may be an operation of determining a transmission priority when uplink (UL) transmission and SL transmission are simultaneously pending in a UE.

According to an embodiment of the present disclosure, a Destination L(layer) <NUM> ID included in a MAC header, when transmitting an IUC message, is newly defined as an independent L2 ID for distinguishing transmission of an IUC message. For example, in the prior art, a destination L2 ID for a broadcast message, a destination L2 ID for a groupcast message, and a destination L2 ID for a unicast message are separately defined. Also, in the prior art, when multiplexing MAC PDUs, multiplexing (MUX) is supported only for the same cast type. That is, in unicast, MUX was possible only between unicasts, in groupcasts, MUX was possible only between groupcasts, and in broadcasts, MUX was possible only between broadcasts.

In this disclosure, an independent destination L2 ID for only IUC messages is defined. That is, according to an embodiment of the present disclosure, a method of allowing only IUC messages to be MUXed when a MAC entity performs MUX of a MAC PDU is proposed. That is, a method in which MAC PDUs other than IUC messages and IUC messages are not MUXed to the same MAC PDU is proposed. In addition, the independent destination L2 ID for only an IUC message may be a common destination L2 ID regardless of broadcast/groupcast/unicast (ie, cast type). That is, for example, a UE can perform broadcast/groupcast/unicast based on the common destination L2 ID. That is, the common destination L2 ID may be available in all cast types.

Alternatively, for example, the independent destination L2 ID for only an IUC message may be defined as an individual destination L2 ID separately divided into broadcast/groupcast/unicast. That is, in order to transmit an IUC message by unicast, an unicast destination L2 ID for an IUC message may be used, in order to transmit an IUC message by groupcast, a groupcast destination L2 ID for an IUC message may be used, in order to transmit an IUC message by broadcast, a broadcast destination L2 ID for an IUC message may be used.

According to an embodiment of the present disclosure, a method of transmitting an IUC message using the same unicast destination L2 ID, groupcast destination L2 ID, and broadcast L2 ID used in the prior art (Release <NUM> NR V2X) is also proposed. When an IUC message is transmitted using a conventional (unicast/groupcast/broadcast) destination L2 ID, a receiving UE receives the corresponding message and may not be able to distinguish whether the message is an IUC message or not. Therefore, in the present disclosure, a method of adding a classification identifier, indicating that the PSSCH related to the corresponding SCI is an IUC message, in SCI is proposed. For example, through this, even if a transmitting UE transmits an IUC message using the same unicast destination L2 ID, groupcast destination L2 ID, and broadcast L2 ID used in the prior art (Release <NUM> NR V2X), a receiving UE may receive the message and may be able to determine whether the corresponding message is an IUC message through SCI.

According to an embodiment of the present disclosure, a method of configuring, by a MAC entity, a MAC PDU by selecting a destination SDU or a destination MAC CE having the highest LCH priority based on the SL priority (or SL LCH priority) order proposed in the present disclosure, if the UE MAC entity has multiple MAC CEs, MAC SDUs, and IUC MAC CE messages to be transmitted to destination UEs is proposed. In addition, a method in which a receiving UE can distinguish and receive an IUC message has also been proposed.

For example, the operation of the proposal of the present disclosure may be limitedly applied for each PC5-RRC connection (or SL unicast link, or source/destination L2 ID pair, or direction of a source/destination L2 ID pair, or direction). For example, the operation of the proposal of the present disclosure may be limitedly applied for each of all PC5-RRC connections (or all SL unicast link, or all source/destination L2 ID pair).

The SL DRX configuration mentioned in this disclosure may include at least one or more of the following parameters.

For example, a Uu DRX timer mentioned in this disclosure may be used for the following purposes.

drx-HARQ-RTT-TimerSL timer: it may represent a period in which a transmitting UE (UE that supports Uu DRX operation) performing sidelink communication based on sidelink resource allocation mode <NUM> does not perform PDCCH (or DCI) monitoring for sidelink mode <NUM> resource allocation from a base station.

drx-RetransmissionTimerSL timer: it may represent a period in which a transmitting UE (UE that supports Uu DRX operation) performing sidelink communication based on sidelink resource allocation mode <NUM> performs PDCCH (or DCI) monitoring for sidelink mode <NUM> resource allocation from a base station. For example, the drx-RetransmissionTimerSL timer may start when drx-HARQ-RTT-TimerSL expires.

For example, the following SL DRX timer mentioned in this disclosure may be used for the following purposes.

SL DRX on-duration timer: it may represent a period in which a UE performing SL DRX operation should operate in active time by default to receive a PSCCH/PSSCH of the other UE.

SL DRX inactivity timer: it may represent a period in which a UE performing SL DRX operation extends an SL DRX on-duration period, which is a period in which the UE must operate in active time by default to receive the PSCCH/PSSCH of the other UE. That is, an SL DRX on-duration timer may be extended by the SL DRX inactivity timer period. In addition, when a UE receives a PSCCH (1st SCI and 2nd SCI) for a new TB from the counterpart UE or receives a new packet (new PSSCH transmission), the UE may extend the SL DRX on-duration timer by starting the SL DRX inactivity timer.

SL DRX HARQ RTT timer: it may represent a period in which a UE performing SL DRX operation operates in sleep mode until receiving a retransmission packet (or PSSCH assignment) transmitted by the other UE. That is, when a UE starts an SL DRX HARQ RTT timer, the UE can operate in sleep mode during the timer running time, by determining that the counterpart UE will not transmit an SL retransmission packet to itself until the SL DRX HARQ RTT timer expires. Alternatively, the UE may not perform monitoring of a sidelink channel/signal transmitted by a transmitting UE.

SL DRX retransmission timer: it may represent a period in which a UE performing SL DRX operation operates as an active time to receive a retransmission packet (or PSSCH allocation) transmitted by the other UE. For example, when an SL DRX HARQ RTT timer expires, an SL DRX retransmission timer may start. During the corresponding timer period, the UE may monitor reception of a retransmitted SL packet (or PSSCH allocation) transmitted by the counterpart UE. For example, an SL DRX retransmission timer may start when an SL DRX HARQ RTT timer expires.

In addition, in the following description, the names of the timers (SL DRX on-duration timer, SL DRX inactivity timer, SL DRX HARQ RTT timer, SL DRX retransmission timer, etc.) are exemplary, timers performing the same/similar functions based on the contents described in each timer may be regarded as the same/similar timers regardless of their names.

The proposal of the present disclosure is a solution that can be applied and extended as a way to solve a problem in which loss occurs due to interference occurring when switching a Uu bandwidth part (BWP).

In addition, for example, when a UE supports a plurality of SL BWPs, it is a solution that can be applied and extended as a method to solve the problem of loss due to interference occurring during SL BWP switching.

The proposal of the present disclosure may be extended and applied to parameters (and timers) included in UE pair specific SL DRX configuration, UE pair specific SL DRX pattern, or UE pair specific SL DRX configuration, not only to parameters (and timers) included in default/common SL DRX configurations or default/common SL DRX patterns or default/common SL DRX configurations.

Also, for example, the on-duration term mentioned in the proposal of the present disclosure may be interpreted as an active time interval, and the off-duration term may be interpreted as a sleep time interval. For example, an active time may mean a period in which a UE operates in a wake up state (a state in which an RF module is On) to receive/transmit a radio signal. For example, a sleep time may mean a period in which a UE operates in a sleep mode state (a state in which an RF module is off) for power saving. For example, a sleep time interval does not mean that a transmitting UE must operate in a sleep mode. That is, if necessary, the UE may be allowed to operate in an active time for a while to perform a sensing operation/transmission operation even during a sleep time period.

For example, whether the (a part of) proposed method/rule of the present disclosure is applied and/or related parameters (e.g., threshold values) may be configured specifically (or differently, or independently) according to resource pool, congestion level, service priority (and/or type), QoS requirements (e.g., delay, reliability) or PQI, traffic type (e.g., (non-) periodic generation), SL transmission resource allocation mode (Mode <NUM>, Mode <NUM>), Tx profile (e.g., a Tx profile indicating that it is service supporting an SL DRX operation, a Tx profile indicating that it is service do not need to support an SL DRX operation), etc..

For example, whether the proposed rule of the present disclosure is applied (and/or related parameter configuration value) may be configured specifically (and/or independently and/or differently) for at least one of whether a UL BWP is activated/inactivated, whether an SL BWP is activated/inactivated, a resource pool (e.g., a resource pool where a PSFCH is configured, a resource pool where a PSFCH is not configured), service/packet type (and/or priority), QoS profile or QoS requirements (e.g., URLLC/EMBB traffic, reliability, delay), PQI, PFI, cast type (e.g., unicast, groupcast, broadcast), (resource pool) congestion level (e.g., CBR), SL HARQ feedback scheme (e.g., NACK Only feedback) , ACK/NACK feedback), the case of HARQ feedback enabled MAC PDU (and/or HARQ feedback disabled MAC PDU) transmission, the case of PUCCH-based SL HARQ feedback reporting operation configuration, pre-emption (and/or re-evaluation) (non-)performance (or based resource reselection), (L2 or L1) (source and/or destination) identifier, (L2 or L1) (combination of source layer ID and destination layer ID) identifier, (L2 or L1) (source layer ID and destination layer ID pair, and cast type combination) identifier, a direction of a pair of source layer ID and destination layer ID, PC5 RRC connection/link, SL DRX (non) performing (or supporting) case, an SL mode type (resource allocation mode <NUM>, resource allocation mode <NUM>), (a)periodic resource reservation execution, a Tx profile (e.g., a Tx profile indicating that it is service supporting an SL DRX operation, a Tx profile indicating that it is service do not need to support an SL DRX operation).

For example, the certain time term mentioned in the proposal of this disclosure may represent a time during which a UE operates as an active time for a predefined time or a specific timer (SL DRX retransmission timer, SL DRX inactivity timer, or timer guaranteeing to operate as active time in DRX operation of a receiving UE) time to receive an SL signal or SL data from a counterpart UE.

Also, for example, whether the proposal and proposal rule of the present disclosure are applied (and/or related parameter configuration values) may also be applied to mmWave SL operation.

According to the existing technology, there may be a problem in that a receiving UE performing sidelink communication performs a receiving operation based on a resource selected by a transmitting UE regardless of whether the receiving UE prefers the resource or not. According to an embodiment of the present disclosure, a transmitting UE may select a transmission resource based on a set of preferred resources (or non-preferred resources) included in IUC information provided by a receiving UE, so an effect of allowing a receiving UE to perform a receiving operation based on its preferred resource may occur.

<FIG> shows a procedure for performing wireless communication by a first device according to an embodiment of the present disclosure.

Referring to <FIG>, in step S1010, a first device receives, from a second device, an inter UE coordination, IUC, request. In step S <NUM>, the first device triggers an IUC information report based on the IUC request. In step S1030, the first device generates a medium access control, MAC, protocol data unit, PDU, including an IUC report MAC control element, CE, based on logical channel prioritization, LCP. In step S <NUM>, the first device transmits, to the second device, first sidelink control information, SCI, for scheduling of a physical sidelink shared channel, PSSCH, through a physical sidelink control channel, PSCCH. In step S <NUM>, the first device transmits, to the second device, the MAC PDU and second SCI through the PSSCH. For example, in a procedure related to the LCP: a priority of the IUC report MAC CE may be lower than a priority of data from a sidelink control channel, SCCH, and a priority of a MAC CE for an SL channel state information, CSI, report; and the priority of the IUC report MAC CE may be higher than a priority of an SL discontinuous reception, DRX, command MAC CE and a priority of data from a sidelink traffic channel, STCH.

For example, the priority of data from an SCCH may be higher than the priority of a MAC CE for an SL CSI report.

For example, the priority of an SL DRX command MAC CE may be higher than the priority of data from an STCH.

For example, a priority of a request based IUC report MAC CE may be higher than a priority of a condition based IUC report MAC CE.

For example, the procedure related to the LCP may be performed based on remaining space of a MAC PDU.

For example, at least one transmission resource may be selected by the second device, based on the IUC report MAC CE.

For example, the IUC report MAC CE may include information related to a preferred resource set.

According to the invention, the IUC report MAC CE includes information related to a non-preferred resource set.

For example, the procedure related to the LCP may be for including a MAC serving data unit, SDU, or a MAC CE in the MAC PDU in order of priority of a related logical channel, LCH.

For example, a MAC PDU including an IUC report MAC CE being multiplexed based on a same destination layer, L, <NUM> ID as a MAC PDU not including an IUC report MAC CE may be not allowed.

For example, a destination L2 ID related to the MAC PDU including the IUC report MAC CE may be available for broadcast, groupcast, and unicast.

For example, the first SCI or the second SCI may include information related to whether the MAC PDU includes the IUC report MAC CE.

For example, the MAC PDU may be generated based on a radio resource control, RRC, connection being established between the first device and the second device.

The above-described embodiment may be applied to various devices described below. First, a processor <NUM> of a first device <NUM> may control a transceiver <NUM> to receive, from a second device <NUM>, an inter UE coordination, IUC, request. And, the processor <NUM> of the first device <NUM> may trigger an IUC information report based on the IUC request. And, the processor <NUM> of the first device <NUM> may generate a medium access control, MAC, protocol data unit, PDU, including an IUC report MAC control element, CE, based on logical channel prioritization, LCP. And, the processor <NUM> of the first device <NUM> may control the transceiver <NUM> to transmit, to the second device <NUM>, first sidelink control information, SCI, for scheduling of a physical sidelink shared channel, PSSCH, through a physical sidelink control channel, PSCCH. And, the processor <NUM> of the first device <NUM> may control the transceiver <NUM> to transmit, to the second device <NUM>, the MAC PDU and second SCI through the PSSCH. For example, in a procedure related to the LCP: a priority of the IUC report MAC CE may be lower than a priority of data from a sidelink control channel, SCCH, and a priority of a MAC CE for an SL channel state information, CSI, report; and the priority of the IUC report MAC CE may be higher than a priority of an SL discontinuous reception, DRX, command MAC CE and a priority of data from a sidelink traffic channel, STCH.

According to an embodiment of the present disclosure, a first device for performing wireless communication may be proposed. 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: receive, from a second device, an inter UE coordination, IUC, request; trigger an IUC information report based on the IUC request; generate a medium access control, MAC, protocol data unit, PDU, including an IUC report MAC control element, CE, based on logical channel prioritization, LCP; transmit, to the second device, first sidelink control information, SCI, for scheduling of a physical sidelink shared channel, PSSCH, through a physical sidelink control channel, PSCCH; and transmit, to the second device, the MAC PDU and second SCI through the PSSCH, wherein in a procedure related to the LCP: a priority of the IUC report MAC CE may be lower than a priority of data from a sidelink control channel, SCCH, and a priority of a MAC CE for an SL channel state information, CSI, report; and the priority of the IUC report MAC CE may be higher than a priority of an SL discontinuous reception, DRX, command MAC CE and a priority of data from a sidelink traffic channel, STCH.

For example, the IUC report MAC CE may include information related to a non-preferred resource set.

For example, a MAC PDU including an IUC report MAC CE being multiplexed based on a same destination layer(L)<NUM> ID as a MAC PDU not including an IUC report MAC CE may be not allowed.

According to an embodiment of the present disclosure, a device adapted to control a first user equipment, UE, may be proposed. For example, the device may comprise: one or more processors; and one or more memories operably connectable to the one or more processors and storing instructions. For example, the one or more processors may execute the instructions to: receive, from a second UE, an inter UE coordination, IUC, request; trigger an IUC information report based on the IUC request; generate a medium access control, MAC, protocol data unit, PDU, including an IUC report MAC control element, CE, based on logical channel prioritization, LCP; transmit, to the second UE, first sidelink control information, SCI, for scheduling of a physical sidelink shared channel, PSSCH, through a physical sidelink control channel, PSCCH; and transmit, to the second UE, the MAC PDU and second SCI through the PSSCH, wherein in a procedure related to the LCP: a priority of the IUC report MAC CE may be lower than a priority of data from a sidelink control channel, SCCH, and a priority of a MAC CE for an SL channel state information, CSI, report; and the priority of the IUC report MAC CE may be higher than a priority of an SL discontinuous reception, DRX, command MAC CE and a priority of data from a sidelink traffic channel, STCH.

According to an embodiment of the present disclosure, a non-transitory computer-readable storage medium storing instructions may be proposed. For example, the instructions, when executed, may cause a first device to: receive, from a second device, an inter UE coordination, IUC, request; trigger an IUC information report based on the IUC request; generate a medium access control, MAC, protocol data unit, PDU, including an IUC report MAC control element, CE, based on logical channel prioritization, LCP; transmit, to the second device, first sidelink control information, SCI, for scheduling of a physical sidelink shared channel, PSSCH, through a physical sidelink control channel, PSCCH; and transmit, to the second device, the MAC PDU and second SCI through the PSSCH, wherein in a procedure related to the LCP: a priority of the IUC report MAC CE may be lower than a priority of data from a sidelink control channel, SCCH, and a priority of a MAC CE for an SL channel state information, CSI, report; and the priority of the IUC report MAC CE may be higher than a priority of an SL discontinuous reception, DRX, command MAC CE and a priority of data from a sidelink traffic channel, STCH.

<FIG> shows a procedure for performing wireless communication by a second device according to an embodiment of the present disclosure.

Referring to <FIG>, in step S1110, a second device may transmit, to a first device, an inter UE coordination, IUC, request. In step S1 <NUM>, the second device may receive, from the first device, first sidelink control information, SCI, for scheduling of a physical sidelink shared channel, PSSCH, through a physical sidelink control channel, PSCCH. In step S1130, the second device may receive, from the first device, a medium access control, MAC, protocol data unit, PDU, including an IUC report MAC control element, CE, and second SCI through the PSSCH. In step S1140, the second device may select at least one transmission resource based on the IUC report MAC CE. For example, the MAC PDU may be generated based on logical channel prioritization (LCP), and wherein in a procedure related to the LCP: a priority of the IUC report MAC CE may be lower than a priority of data from a sidelink control channel, SCCH, and a priority of a MAC CE for an SL channel state information, CSI, report; and the priority of the IUC report MAC CE may be higher than a priority of an SL discontinuous reception, DRX, command MAC CE and a priority of data from a sidelink traffic channel, STCH.

For example, the priority of data from an SCCH may be higher than the priority of a MAC CE for an SL CSI report, and the priority of an SL DRX command MAC CE may be higher than the priority of data from an STCH.

The above-described embodiment may be applied to various devices described below. First, a processor <NUM> of a second device <NUM> may control a transceiver <NUM> to transmit, to a first device <NUM>, an inter UE coordination, IUC, request. And, the processor <NUM> of the second device <NUM> may control the transceiver <NUM> to receive, from the first device <NUM>, first sidelink control information, SCI, for scheduling of a physical sidelink shared channel, PSSCH, through a physical sidelink control channel, PSCCH. And, the processor <NUM> of the second device <NUM> may control the transceiver <NUM> to receive, from the first device <NUM>, a medium access control, MAC, protocol data unit, PDU, including an IUC report MAC control element, CE, and second SCI through the PSSCH. And, the processor <NUM> of the second device <NUM> may select at least one transmission resource based on the IUC report MAC CE. For example, the MAC PDU may be generated based on logical channel prioritization, LCP, and wherein in a procedure related to the LCP: a priority of the IUC report MAC CE may be lower than a priority of data from a sidelink control channel, SCCH, and a priority of a MAC CE for an SL channel state information, CSI, report; and the priority of the IUC report MAC CE may be higher than a priority of an SL discontinuous reception, DRX, command MAC CE and a priority of data from a sidelink traffic channel, STCH.

According to an embodiment of the present disclosure, a second device for performing wireless communication may be proposed. 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: transmit, to a first device, an inter UE coordination, IUC, request; receive, from the first device, first sidelink control information, SCI, for scheduling of a physical sidelink shared channel, PSSCH, through a physical sidelink control channel, PSCCH; receive, from the first device, a medium access control, MAC, protocol data unit, PDU, including an IUC report MAC control element, CE, and second SCI through the PSSCH; and select at least one transmission resource based on the IUC report MAC CE, wherein the MAC PDU is generated based on logical channel prioritization, LCP, and wherein in a procedure related to the LCP: a priority of the IUC report MAC CE may be lower than a priority of data from a sidelink control channel, SCCH, and a priority of a MAC CE for an SL channel state information, CSI, report; and the priority of the IUC report MAC CE may be higher than a priority of an SL discontinuous reception, DRX, command MAC CE and a priority of data from a sidelink traffic channel, STCH.

For example, the priority of data from an SCCH may be higher than the priority of a MAC CE for an SL CSI report, and wherein the priority of an SL DRX command MAC CE may be higher than the priority of data from an STCH.

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/SG 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 100fBS <NUM>, or BS 200BS <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, by a first device (<NUM>), wireless communication, the method comprising:
receiving (S810, S1010), from a second device (<NUM>), an inter UE coordination, IUC, request;
triggering (S820, S1020) an IUC information report based on the IUC request;
generating (S830, S1030) a medium access control, MAC, protocol data unit, PDU, including an IUC report MAC control element, CE, based on logical channel prioritization, LCP;
transmitting (S1040), to the second device (<NUM>), first sidelink control information, SCI, for scheduling of a physical sidelink shared channel, PSSCH, through a physical sidelink control channel, PSCCH; and
transmitting (S840, S1050), to the second device (<NUM>) through the PSSCH, i) the MAC PDU and ii) second SCI including a destination layer-<NUM> ID related to the transmission of the IUC report MAC CE only,
wherein the IUC report MAC CE includes information related to a preferred resource set.