METHOD AND DEVICE FOR COMMUNICATING ON BASIS OF INTER-UE COORDINATION INFORMATION IN NR V2X

A method by which a first device performs wireless communication and a device for supporting same are provided. The method may comprise the steps of: acquiring a configuration for partial sensing-based resource selection, the partial sensing including periodic-based partial sensing (PBPS) or contiguous partial sensing (CPS); receiving, from a second device, inter-UE coordination (IUC) information including information related to a preferred resource set; acquiring sidelink (SL) data; and selecting, on the basis that the partial sensing is skipped for power saving, a transmission resource for the SL data from among resources belonging to the preferred resource set included in the IUC information.

TECHNICAL FIELD

This disclosure relates to a wireless communication system.

BACKGROUND ART

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 4 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.

DISCLOSURE

Technical Problem

Meanwhile, according to the prior art, when selecting a method of allocating resource(s), the UE does not use inter-UE coordination information. For this reason, when the UE selects/allocates resource(s) based on partial sensing or the like, a problem in which resource collisions cannot be effectively avoided may occur.

Technical Solution

In one embodiment, provided is a method for performing wireless communication based on partial sensing by a first device. The method may comprise: obtaining a configuration for resource selection based on partial sensing, wherein the partial sensing includes periodic-based partial sensing (PBPS) or contiguous partial sensing (CPS); receiving, from a second device, inter-UE coordination (IUC) information including information related to a preferred resource set; obtaining sidelink (SL) data; and selecting a transmission resource for the SL data from resources belonging to the preferred resource set included in the IUC information, based on skipping the partial sensing for power saving.

In one embodiment, provided is a first device adapted to perform wireless communication. The first device may comprise: one or more memories storing instructions; one or more transceivers; and one or more processors connected to the one or more memories and the one or more transceivers, wherein the one or more processors execute the instructions to: obtain a configuration for resource selection based on partial sensing, wherein the partial sensing includes periodic-based partial sensing (PBPS) or contiguous partial sensing (CPS); control the one or more transceivers to receive, from a second device, inter-UE coordination (IUC) information including information related to a preferred resource set; obtain sidelink (SL) data; and select a transmission resource for the SL data from resources belonging to the preferred resource set included in the IUC information, based on skipping the partial sensing for power saving.

In one embodiment, provided is a processing device adapted to control a first device. The processing device may comprise: 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: obtain a configuration for resource selection based on partial sensing, wherein the partial sensing includes periodic-based partial sensing (PBPS) or contiguous partial sensing (CPS): receive, from a second device, inter-UE coordination (IUC) information including information related to a preferred resource set; obtain sidelink (SL) data; and select a transmission resource for the SL data from resources belonging to the preferred resource set included in the IUC information, based on skipping the partial sensing for power saving.

Advantageous Effects

The power saving gain of the UE can be maximized and the reliability of SL communication can be secured.

MODE FOR INVENTION

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 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.

FIG.1shows a structure of an NR system, based on an embodiment of the present disclosure. The embodiment ofFIG.1may be combined with various embodiments of the present disclosure.

Referring toFIG.1, a next generation-radio access network (NG-RAN) may include a BS20providing a UE10with a user plane and control plane protocol termination. For example, the BS20may include a next generation-Node B (gNB) and/or an evolved-NodeB (eNB). For example, the UE10may be fixed or mobile and may be referred to as other terms, such as a mobile station (MS), a user terminal (UT), a subscriber station (SS), a mobile terminal (MT), wireless device, and so on. For example, the BS may be referred to as a fixed station which communicates with the UE10and may be referred to as other terms, such as a base transceiver system (BTS), an access point (AP), and so on.

The embodiment ofFIG.1exemplifies a case where only the gNB is included. The BSs20may be connected to one another via Xn interface. The BS20may be connected to one another via 5th generation (5G) core network (5GC) and NG interface. More specifically, the BSs20may be connected to an access and mobility management function (AMF)30via NG-C interface, and may be connected to a user plane function (UPF)30via NG-U interface.

Layers of a radio interface protocol between the UE and the network can be classified into a first layer (layer 1, L1), a second layer (layer 2, L2), and a third layer (layer 3, 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.2shows a radio protocol architecture, based on an embodiment of the present disclosure. The embodiment ofFIG.2may be combined with various embodiments of the present disclosure. Specifically, (a) ofFIG.2shows a radio protocol stack of a user plane for Uu communication, and (b) ofFIG.2shows a radio protocol stack of a control plane for Uu communication. (c) ofFIG.2shows a radio protocol stack of a user plane for SL communication, and (d) ofFIG.2shows 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.3shows a structure of a radio frame of an NR, based on an embodiment of the present disclosure. The embodiment ofFIG.3may be combined with various embodiments of the present disclosure.

Table 1 shown below represents an example of a number of symbols per slot (Nslotsymb), a number slots per frame (Nframe,μslot), and a number of slots per subframe (Nsubframe,μslot) based on an SCS configuration (u), in a case where a normal CP is used.

Table 2 shows an example of a number of symbols per slot, a number of slots per frame, and a number of slots per subframe based on the SCS, in a case where an extended CP is used.

In an NR system, OFDMA(A) numerologies (e.g., length, and so on) between multiple cells being integrate to one UE may be differently configured. Accordingly, a (absolute time) duration (or section) of a time resource (e.g., subframe, slot or TTI) (collectively referred to as a time unit (TU) for simplicity) being configured of the same number of symbols may be differently configured in the integrated cells.

FIG.4shows a structure of a slot of an NR frame, based on an embodiment of the present disclosure. The embodiment ofFIG.4may be combined with various embodiments of the present disclosure.

For example, the BWP may be at least any one of an active BWP, an initial BWP, and/or a default BWP. For example, the UE may not monitor downlink radio link quality in a DL BWP other than an active DL BWP on a primary cell (PCell). For example, the UE may not receive PDCCH, physical downlink shared channel (PDSCH), or channel state information-reference signal (CSI-RS) (excluding RRM) outside the active DL BWP. For example, the UE may not trigger a channel state information (CSI) report for the inactive DL BWP. For example, the UE may not transmit physical uplink control channel (PUCCH) or physical uplink shared channel (PUSCH) outside an active UL BWP. For example, in a downlink case, the initial BWP may be given as a consecutive RB set for a remaining minimum system information (RMSI) control resource set (CORESET) (configured by physical broadcast channel (PBCH)). For example, in an uplink case, the initial BWP may be given by system information block (SIB) for a random access procedure. For example, the default BWP may be configured by a higher layer. For example, an initial value of the default BWP may be an initial DL BWP. For energy saving, if the UE fails to detect downlink control information (DCI) during a specific period, the UE may switch the active BWP of the UE to the default BWP.

FIG.5shows an example of a BWP, based on an embodiment of the present disclosure. The embodiment ofFIG.5may be combined with various embodiments of the present disclosure. It is assumed in the embodiment ofFIG.5that the number of BWPs is 3.

Hereinafter, V2X or SL communication will be described.

For example, (a) ofFIG.6shows a UE operation related to an LTE transmission mode 1 or an LTE transmission mode 3. Alternatively, for example, (a) ofFIG.6shows a UE operation related to an NR resource allocation mode 1. For example, the LTE transmission mode 1 may be applied to general SL communication, and the LTE transmission mode 3 may be applied to V2X communication.

For example, (b) ofFIG.6shows a UE operation related to an LTE transmission mode 2 or an LTE transmission mode 4. Alternatively, for example, (b) ofFIG.6shows a UE operation related to an NR resource allocation mode 2.

Referring to (a) ofFIG.6, in the LTE transmission mode 1, the LTE transmission mode 3, or the NR resource allocation mode 1, 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 1 resource(s) or CG type 2 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 1 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 2 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.

Hereinafter, an example of DCI format 3_0 will be described.

DCI format 3_0 is used for scheduling of NR PSCCH and NR PSSCH in one cell.

The following information is transmitted by means of the DCI format 3_0 with CRC scrambled by SL-RNTI or SL-CS-RNTI:Resource pool index—ceiling (log2I) bits, where I is the number of resource pools for transmission configured by the higher layer parameter sl-TxPoolScheduling.Time gap—3 bits determined by higher layer parameter sl-DCI-ToSL-TransHARQ process number—4 bitsNew data indicator—1 bitLowest index of the subchannel allocation to the initial transmission—ceiling (log2(NSLubaCamne)) bitsSCI format 1-A fields: frequency resource assignment, time resource assignmentPSFCH-to-HARQ feedback timing indicator—ceiling (log2Nfb_timing) bits, where Nfb_timingis the number of entries in the higher layer parameter sl-PSFCH-ToPUCCH.PUCCH resource indicator—3 bitsConfiguration index—0 bit if the UE is not configured to monitor DCI format 3_0 with CRC scrambled by SL-CS-RNTI: otherwise 3 bits. If the UE is configured to monitor DCI format 3_0 with CRC scrambled by SL-CS-RNTI, this field is reserved for DCI format 3_0 with CRC scrambled by SL-RNTI.Counter sidelink assignment index—2 bits, 2 bits if the UE is configured with pdsch-HARQ-ACK-Codebook=dynamic, 2 bits if the UE is configured with pdsch-HARQ-ACK-Codebook=semi-staticPadding bits, if required

Referring to (b) ofFIG.6, in the LTE transmission mode 2, the LTE transmission mode 4, or the NR resource allocation mode 2, 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) ofFIG.6, 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., 2-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., 2-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 1stSCI, 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 2ndSCI, 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 1-A, and the 2nd-stage SCI format may include a SCI format 2-A and/or a SCI format 2-B.

Hereinafter, an example of SCI format 1-A will be described.

SCI format 1-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 1-A:Priority—3 bitsFrequency resource assignment—ceiling (log2(NSLsubChannel+1)/2)) bits when the value of the higher layer parameter sl-MaxNumPerReserve is configured to 2; otherwise ceiling log2(NSLsubChannel(NSLsubChannel+1)(2NSLsubChannel+1)/6) bits when the value of the higher layer parameter sl-MaxNumPerReserve is configured to 3Time resource assignment—5 bits when the value of the higher layer parameter sl-MaxNumPerReserve is configured to 2; otherwise 9 bits when the value of the higher layer parameter sl-MaxNumPerReserve is configured to 3Resource reservation period—ceiling (log2Nrsv_period) bits, where Nrsv_periodis the number of entries in the higher layer parameter sl-ResourceReservePeriodList, if higher layer parameter sl-MultiReserveResource is configured: 0 bit otherwiseDMRS pattern—ceiling (log2Npattern) bits, where Npatternis the number of DMRS patterns configured by higher layer parameter sl-PSSCH-DMRS-TimePattemList2nd-stage SCI format—2 bits as defined in Table 5Beta_offset indicator—2 bits as provided by higher layer parameter sl-BetaOffsets2ndSCiNumber of DMRS port—1 bit as defined in Table 6Modulation and coding scheme—5 bitsAdditional MCS table indicator—1 bit if one MCS table is configured by higher layer parameter sl-Additional-MCS-Table; 2 bits if two MCS tables are configured by higher layer parameter sl-Additional-MCS-Table; 0 bit otherwisePSFCH overhead indication—1 bit if higher layer parameter sl-PSFCH-Period=2 or 4; 0 bit otherwiseReserved—a number of bits as determined by higher layer parameter sl-NumReservedBits, with value set to zero.

TABLE 6Value of the Numberof DMRS port fieldAntenna ports0100011000 and 1001

Hereinafter, an example of SCI format 2-A will be described.

SCI format 2-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.

The following information is transmitted by means of the SCI format 2-A:HARQ process number—4 bitsNew data indicator—I bitRedundancy version—2 bitsSource ID—8 bitsDestination ID—16 bitsHARQ feedback enabled/disabled indicator—1 bitCast type indicator—2 bits as defined in Table 7CST request—1 bit

Hereinafter, an example of SCI format 2-B will be described.

SCI format 2-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 2-B:HARQ process number—4 bitsNew data indicator—1 bitRedundancy version—2 bitsSource ID—8 bitsDestination ID—16 bitsHARQ feedback enabled/disabled indicator—1 bitZone ID—12 bitsCommunication range requirement—4 bits determined by higher layer parameter sl-ZoneConfigMCR-Index

Referring to (a) or (b) ofFIG.6, 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) ofFIG.6, in step S640, the first UE may transmit SL HARQ feedback to the base station through the PUCCH and/or the PUSCH.

FIG.7shows three cast types, based on an embodiment of the present disclosure. The embodiment ofFIG.7may be combined with various embodiments of the present disclosure. Specifically, (a) ofFIG.7shows broadcast-type SL communication, (b) ofFIG.7shows unicast type-SL communication, and (c) ofFIG.7shows groupcast-type SL communication. In case of the unicast-type SL communication, a UE may perform one-to-one communication with respect to another UE. In case of the groupcast-type SL transmission, the UE may perform SL communication with respect to one or more UEs in a group to which the UE belongs. In various embodiments of the present disclosure, SL groupcast communication may be replaced with SL multicast communication, SL one-to-many communication, or the like.

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

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

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

(1) Groupcast option 1: After the receiving UE decodes the PSCCH of which the target is the receiving UE, if the receiving UE fails in decoding of a transport block related to the PSCCH, the receiving UE may transmit HARQ-NACK to the transmitting UE through a PSFCH. Otherwise, if the receiving UE decodes the PSCCH of which the target is the receiving UE and if the receiving UE successfully decodes the transport block related to the PSCCH, the receiving UE may not transmit the HARQ-ACK to the transmitting UE.

(2) Groupcast option 2: After the receiving UE decodes the PSCCH of which the target is the receiving UE, if the receiving UE fails in decoding of the transport block related to the PSCCH, the receiving UE may transmit HARQ-NACK to the transmitting UE through the PSFCH. In addition, if the receiving UE decodes the PSCCH of which the target is the receiving UE and if the receiving UE successfully decodes the transport block related to the PSCCH, the receiving UE may transmit the HARQ-ACK to the transmitting UE through the PSFCH.

For example, if the groupcast option 1 is used in the SL HARQ feedback, all UEs performing groupcast communication may share a PSFCH resource. For example, UEs belonging to the same group may transmit HARQ feedback by using the same PSFCH resource.

For example, if the groupcast option 2 is used in the SL HARQ feedback, each UE performing groupcast communication may use a different PSFCH resource for HARQ feedback transmission. For example, UEs belonging to the same group may transmit HARQ feedback by using different PSFCH resources.

In the present disclosure, HARQ-ACK may be referred to as ACK. ACK information, or positive-ACK information, and HARQ-NACK may be referred to as NACK, NACK information, or negative-ACK information.

Hereinafter, UE procedure for reporting HARQ-ACK on sidelink will be described.

A UE can be indicated by an SC format scheduling a PSSCH reception, in one or more sub-channels from a number of NPSSCHsubchsub-channels, to transmit a PSFCH with HARQ-ACK information in response to the PSSCH reception. The UE provides HARQ-ACK information that includes ACK or NACK, or only NACK.

A UE can be provided, by sl-PSFCH-Period-r16, a number of slots in a resource pool for a period of PSFCH transmission occasion resources. If the number is zero, PSFCH transmissions from the UE in the resource pool are disabled. A UE expects that a slot t′kSL(0≤k<Tmax) has a PSFCH transmission occasion resource if k mod NPSFCHPSSCH=0, where t′kSLis a slot that belongs to the resource pool, Tmaxis a number of slots that belong to the resource pool within 10240 msec, and NPSFCHPSSCHis provided by sl-PSFCH-Period-r16. A UE may be indicated by higher layers to not transmit a PSFCH in response to a PSSCH reception. If a UE receives a PSSCH in a resource pool and the HARQ feedback enabled/disabled indicator field in an associated SCI format 2-A or a SCI format 2-B has value 1, the UE provides the HARQ-ACK information in a PSFCH transmission in the resource pool. The UE transmits the PSFCH in a first slot that includes PSFCH resources and is at least a number of slots, provided by sl-MinTimeGapPSFCH-r16, of the resource pool after a last slot of the PSSCH reception.

A UE is provided by sl-PSFCH-RB-Set-r16 a set of MPSFCHPRB,setPRBs in a resource pool for PSFCH transmission in a PRB of the resource pool. For a number of Nsubchsub-channels for the resource pool, provided by sl-NumSubchannel, and a number of PSSCH slots associated with a PSFCH slot that is less than or equal to NPSFCHPSSCH, the UE allocates the [(i+j·NPSFCHPSSCH)·MPSFCHsubch,set, (i+1+j·NPSFCHPSSCH)·MPSFCHsubch,slot−1] PRBs from the MPRB,setPSFCHPRBs to slot i among the PSSCH slots associated with the PSFCH slot and sub-channel j, where MPSFCHsubch,slot=MPSFCHPRB,set/(Nsubch·NPSFCHPSSCH), 0≤i<NPSFCHPSSCH, 0≤j<Nsubch, and the allocation starts in an ascending order of i and continues in an ascending order of j. The UE expects that MPSFCHPRB,setis a multiple of Nsubch·NPSFCHPSSCH.

A UE determines a number of PSFCH resources available for multiplexing HARQ-ACK information in a PSFCH transmission as RPSFCHPRB,CS=NPSFCHtype·MPSFCHsubch,slot·NPSFCHCSwhere NPSFCHCSis a number of cyclic shift pairs for the resource pool and, based on an indication by higher layers,NPSFCHtype=1 and the MPSFCHsubch,setPRBs are associated with the starting sub-channel of the corresponding PSSCHNPSFCHtype=NPSSCHsubchand the NPSSCHsubch·MPSFCHsubch,setPRBs are associated with one or more sub-channels from the NPSSCHsubchsub-channels of the corresponding PSSCH

The PSFCH resources are first indexed according to an ascending order of the PRB index, from the NPSFCHtype·MPSFCHsubch,slotPRBs, and then according to an ascending order of the cyclic shift pair index from the NPSFCHCScyclic shift pairs.

A UE determines an index of a PSFCH resource for a PSFCH transmission in response to a PSSCH reception as (PID+MID) mod RPSFCHPRB,CSwhere PIDis a physical layer source ID provided by SC format 2-A or 2-B scheduling the PSSCH reception, and MIDis the identity of the UE receiving the PSSCH as indicated by higher layers if the UE detects a SCI format 2-A with Cast type indicator field value of “01”; otherwise, MIDis zero.

A UE determines a m0value, for computing a value of cyclic shift α, from a cyclic shift pair index corresponding to a PSFCH resource index and from NPSFCHCSusing Table 8.

A UE determines a mes, value, for computing a value of cyclic shift α, as in Table 9 if the UE detects a SCI format 2-A with Cast type indicator field value of “01” or “10”, or as in Table 10 if the UE detects a SCI format 2-B or a SCI format 2-A with Cast type indicator field value of “11”. The UE applies one cyclic shift from a cyclic shift pair to a sequence used for the PSFCH transmission.

Hereinafter, UE procedure for determining the subset of resources to be reported to higher layers in PSSCH resource selection in sidelink resource allocation mode 2 will be described.

In resource allocation mode 2, the higher layer can request the UE to determine a subset of resources from which the higher layer will select resources for PSSCH/PSCCH transmission. To trigger this procedure, in slot n, the higher layer provides the following parameters for this PSSCH/PSCCH transmission:the resource pool from which the resources are to be reported;L1 priority, prioTX;the remaining packet delay budget;the number of sub-channels to be used for the PSSCH/PSCCH transmission in a slot, LsubCH,optionally, the resource reservation interval, PmvpTX, in units of msec.if the higher layer requests the UE to determine a subset of resources from which the higher layer will select resources for PSSCH/PSCCH transmission as part of re-evaluation or pre-emption procedure, the higher layer provides a set of resources (r0, r1, r2, . . . ) which may be subject to re-evaluation and a set of resources (r′0, r′1, r′2, . . . ) which may be subject to pre-emption.it is up to UE implementation to determine the subset of resources as requested by higher layers before or after the slot r1″−T3where r1″ is the slot with the smallest slot index among (r0, r1, r2, . . . ) and (r′0, r′1, r′2, . . . ), and T3is equal to TSLproc,1, where TSLproc,1is defined as the number of slots according to SCS, where μSLis the SCS configuration of the SL BWP.

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

(t′SL0, t′SL1, t′SL2, . . . ) denotes the set of slots which belongs to the sidelink resource pool.

For example, the UE may select a set of candidate resources (SA) based on Table 11. For example, if resource (re)selection is triggered, the UE may select a set of candidate resources (SA) based on Table 11. For example, if re-evaluation or pre-emption is triggered, the UE may select a set of candidate resources (SA %) based on Table 11.

TABLE 11The following steps are used:1)A candidate single-slot resource for transmission Rx,yis defined as a set of LsubCHcontiguous sub-channels with sub-channel x + j in slot ty′SLwhere j = 0, ... ,LsubCH− 1. The UE shall assume that any set of LsubCHcontiguous sub-channels included in the corresponding resource pool within the time interval [n + T1, n +T2] correspond to one candidate single-slot resource, where- selection of T1is up to UE implementation under 0 ≤ T1≤ Tproc,1SL, where Tproc,1SLis defined in slots in Table8.1.4-2 where μSLis the SCS configuration of the SL BWP;- if T2minis shorter than the remaining packet delay budget (in slots) then T2is up to UE implementationsubject to T2min≤ T2remaining packet delay budget (in slots); otherwise T2is set to the remaining packetdelay budget (in slots).The total number of candidate single-slot resources is denoted by Mtotal.2)The sensing window is defined by the range of slots [n − T0, n − Tproc,0SL) where T0is defined above and Tproc,0SLisdefined in slots in Table 8.1.4-1 where μSLis the SCS configuration of the SL BWP. The UE shall monitor slotswhich belongs to a sidelink resource pool within the sensing window except for those in which its own transmissionsoccur. The UE shall perform the behaviour in the following steps based on PSCCH decoded and RSRP measuredin these slots.3)The internal parameter Th(pi, pj) is set to the corresponding value of RSRP threshold indicated by the i-th field insl-Thres-RSRP-List, where i = pi+ (pj− 1) * 8.4)The set SAis initialized to the set of all the candidate single-slot resources.5)The UE shall exclude any candidate single-slot resource Rx,yfrom the set SAif it meets all the following conditions:-  the UE has not monitored slot tm′SLin Step 2.-  for any periodicity value allowed by the higher layer parameter sl-ResourceReservePeriodList and a hypotheticalSCI format 1-A received in slot tm′SLwith ′Resource reservation period′ field set to that periodicity value andindicating all subchannels of the resource pool in this slot, condition c in step 6 would be met.5a)If the number of candidate single-slot resources Rx,yremaining in the set SAis smaller than X · Mtotalthe set SAisinitialized to the set of all the candidate single-slot resources as in step 4.6)The UE shall exclude any candidate single-slot resource Rx,yfrom the set SAif it meets all the following conditions:a) the UE receives an SCI format 1-A in slot tm′SL, and ′Resource reservation period′ field, if present, and ′Priority′field in the received SCI format 1-A indicate the values Prsvp_RX and prioRX, respectively according to Clause16.4 in [6, TS 38.213];b) the RSRP measurement performed, according to clause 8.4.2. 1 for the received SCI format I-A, is higher thanTh(prioRX, prioTX);c) the SCI format received in slot tm′SLor the same SCI format which, if and only if the ′Resource reservationperiod′ field is present in the received SCI format 1-A, is assumed to be received in slot(s) tm+q×prsvp_RX′′SLdetermines according to clause 8.1.5 the set of resource blocks and slots which overlaps with Rx,y+j×Prsvp_TX′for q = 1, 2, ... , Q and j = 0, 1, ... ,Cresel-1.Here,Prsvp_RX′⁢is⁢Prsvp_RX⁢converted⁢to⁢units⁢⁢of⁢logical⁢slots⁢according⁢to⁢clause⁢8.1.7,Q=⌈TscalPrsvp⁢_⁢RX⌉if Prsvp_RX < Tscaland n′ − m ≤ Prsvp_RX′, where tn′′SL= n if slot n belongs to the set (t0'SL, t1′SL, ... ,tT′max-1′SL),otherwise slot tn′′SLis the first slot after slot n belonging to the set (t0'SL, t1′SL, ... , tT′max-1′SL); otherwise Q = 1.Tscalis set to selection window size T2converted to units of msec.7)If the number of candidate single-slot resources remaining in the set SAis smaller than X · Mtotal, then Th(pi, pj) isincreased by 3 dB for each priority value Th(pi, pj) and the procedure continues with step 4.The UE shall report set SAto higher layers.If a resource rifrom the set (r0, r1, r2, ... ) is not a member of SA, then the UE shall report re-evaluation of the resource ritohigher layers.If a resource ri′ from the set (r0′, r1′, r2′, ... ) meets the conditions below then the UE shall report pre-emption of the resourceri′ to higher layers-ri′ is not a member of SA, and-ri′ meets the conditions for exclusion in step 6, with Th(prioRX, prioTX) set to the final threshold after executing steps1)-7), i.e. including all necessary increments for reaching X · Mtotal, and-the associated priority prioRX, satisfies one of the following conditions:- sl-PreemptionEnable is provided and is equal to ′enabled′ and prioTX> prioRX- sl-PreemptionEnable is provided and is not equal to ′enabled′, and prioRX< priopreand prioTX> prioRX

Meanwhile, partial sensing may be supported for power saving of the UE. For example, in LTE SL or LTE V2X, the UE may perform partial sensing based on Tables 12 and 13.

TABLE 12In sidelink transmission mode 4, when requested by higher layers in subframe n for a carrier, the UE shall determine the set ofresources to be reported to higher layers for PSSCH transmission according to the steps described in this Subclause. ParametersLsubCHthe number of sub-channels to be used for the PSSCH transmission in a subframe, Prsvp_TX the resource reservationinterval, and prioTXthe priority to be transmitted in the associated SCI format I by the UE are all provided by higher layers.In sidelink transmission mode 3, when requested by higher layers in subframe n for a carrier, the UE shall determine the set ofresources to be reported to higher layers in sensing measurement according to the steps described in this Subclause. ParametersLsubCH, Prsvp_TX and prioTXare all provided by higher layers. Cresel is determined by Cresel= 10*SL RESOURCE_RESELECTION_COUNTER, where SL_RESOURCE_RESELECTION_COUNTER is provided by higher layers....If partial sensing is configured by higher layers then the following steps are used:1)  A candidate single-subframe resource for PSSCH transmission Rx,yis defined as a set of LsubCHcontiguous sub-channels with sub-channel x + j in subframe where j = 0, ... ,LsubCH−1. The UE shall determine by itsimplementation a set of subframes which consists of at least Y subframes within the time interval [n + T1, n + T2]where selections of T1and T2are up to UE implementations under T1≤ 4 and T2min(prioTX) ≤ T2≤100,if T2min(prioTX) is provided by higher layers for prioTX, otherwise 20 ≤ T2≤ 100. UE selection of T2shall fulfil the latency requirement and Y shall be greater than or equal to the high layer parameterminNumCandidateSF. The UE shall assume that any set of LsubCHcontiguous sub-channels included in thecorresponding PSSCH resource pool within the determined set of subframes correspond to one candidate single-subframeresource. The total number of the candidate single-subframe resources is denoted by Mtotal.2)⁢If⁢a⁢subframe⁢tySL⁢i⁢s⁢included⁢in⁢the⁢set⁢of⁢subframes⁢in⁢Step1.the⁢UE⁢shall⁢monitor⁢any⁢subframe⁢⁢ty-k×PstepSL⁢if⁢k-th⁢bitof the high layer parameter gapCandidateSensing is set to 1. The UE shall perform the behaviour in the following stepsbased on PSCCH decoded and S-RSSI measured in these subframes.3)  The parameteris set to the value indicated by the i-th SL-ThresPSSCH-RSRP field in SL-ThresPSSCH-RSRP-Listwhere i = (a − 1) * 8 + b.4)  The set SAis initialized to the union of all the candidate single-subframe resources. The set SBis initialized to anempty set.5)  The UE shall exclude any candidate single-subframe resource Rx,yfrom the set SAif it meets all the followingconditions:- the UE receives an SCI format 1 in subframe tmSL, and ″Resource reservation″ field and ″Priority″ field in the receivedSCI⁢format⁢1⁢indicate⁢the⁢values⁢Prsvp_RX⁢and⁢prioRX,respectively.- PSSCH-RSRP measurement according to the received SCI format 1 is higher than ThprioTX,prioRX.- the SCI format received in subframe tmSLor the same SCI format 1 which is assumed to be received in subframe(s)tm+q×Pstep×Prsvp⁢_⁢RXSL⁢determines⁢according⁢to14.1.1.4C⁢the⁢set⁢of⁢resource⁢blocks⁢and⁢subframes⁢which⁢overlaps⁢withRx,y+j×Prsvp⁢_⁢TX′⁢for⁢q=1,2,…,Q⁢and⁢j=0,1,…,Cresel-1.Here,Q=1Prsvp⁢_⁢RX⁢if⁢Prsvp⁢_⁢RX<1⁢andy′ − m ≤ Pstep× Prsvp_RX + Pstep, where ty′SLis the last subframe of the Y subframes , andQ = 1 otherwise.6)  If the number of candidate single-subframe resources remaining in the set SAis smaller than 0.2 · Mtotal, then Step4 is repeated with Tha,bincreased by 3 dB.

TABLE 137) For a candidate single-subframe resource Rx,yremaining in the set SA, the metric Ex,yis defined as the linearaverage of S-RSSI measured in sub-channels x + k for k=0, ... ,LsubCH−1 in the monitored subframes in Step 2 thatcan⁢be⁢expressed⁢by⁢ty-PstepSL*j⁢for⁢a⁢non-negative⁢integer⁢j.8) The UE moves the candidate single-subframe resource Rx,ywith the smallest metric Ex,yfrom the set SAtoSB. This step is repeated until the number of candidate single-subframe resources in the set SBbecomes greater than or equal to 0.2 · Mtotal.9) When the UE is configured by upper layers to transmit using resource pools on multiple carriers, it shall excludea candidate single-subframe resource Rx,yfrom SBif the UE does not support transmission in the candidate single-subframe resource in the carrier under the assumption that transmissions take place in other carrier(s) using thealready selected resources due to its limitation in the number of simultaneous transmission carriers, its limitationin the supported carrier combinations, or interruption for RF retuning time.The UE shall report set SBto higher layers.If transmission based on random selection is configured by upper layers and when the UE is configured by upper layersto transmit using resource pools on multiple carriers, the following steps are used:1) A candidate single-subframe resource for PSSCH transmission Rx,yis defined as a set of LsubCHcontiguoussub-channels with sub-channel x + j in subframe tySLwhere j = 0, ... ,LsubCH−1. The UE shall assume that anyset of LsubCHcontiguous sub-channels included in the corresponding PSSCH resource pool within the timeinterval [n+T1, n+T2] corresponds to one candidate single-subframe resource, where selections of T1and T2are up to UE implementations under T1≤ 4 and T2min(prioTX) ≤T2≤ 100, if T2min(prioTX) is providedby higher layers for prioTX, otherwise 20 ≤ T2≤ 100 UE selection of T2shall fulfil the latency requirement.The total number of the candidate single-subframe resources is denoted by Mtotal.2) The set SA, is initialized to the union of all the candidate single-subframe resources. The set SBis initialized toan empty set.3) The UE moves the candidate single-subframe resource Rx,yfrom the set SAto SB.4) The UE shall exclude a candidate single-subframe resource Rx,yfrom SBif the UE does not support transmissionin the candidate single-subframe resource in the carrier under the assumption that transmissions take place inother carrier(s) using the already selected resources due to its limitation in the number of simultaneoustransmission carriers, its limitation in the supported carrier combinations, or interruption for RF retuning time].The UE shall report set SBto higher layers.

FIG.8shows a method for a UE to reselect a resource through a re-evaluation procedure or a pre-emption procedure, based on an embodiment of the present disclosure. The embodiment ofFIG.8may be combined with various embodiments of the present disclosure.

Referring toFIG.8, it is assumed that the UE selects a first resource (i.e., initially selected resource) in the slot m within the selection window. In this case, the UE may continuously perform sensing through the re-evaluation procedure or the pre-emption procedure before the first resource is actually used, and the UE may detect a collision for the first resource. In this case, the UE may reselect the first resource in the slot m as a second resource (i.e., new selected resource) in the slot m′. The re-evaluation procedure or the pre-emption procedure is specifically described in Table 11.

Meanwhile, according to the prior art, when selecting a method of allocating resource(s), the UE does not use inter-UE coordination information. For this reason, when the UE selects/allocates resource(s) based on partial sensing or the like, a problem in which resource collisions cannot be effectively avoided may occur.

Based on an embodiment of the present disclosure, a method for selecting a resource allocation method based on coordination information between UEs and an apparatus supporting the same are proposed.

For example, in various embodiments of the present disclosure, periodic-based partial sensing (PPS) may refer to an operation of performing sensing at the time corresponding to an integer multiple k of each period based on the number of periods corresponding to a specific configured value when performing sensing for resource selection. For example, the periods may be periods of transmission resources configured in a resource pool. For example, the UE may sense resource(s) at the time that is earlier in time by an integer multiple k of each period from the time of candidate resource(s) to be determined whether or not a resource collision occurs. For example, the k value may be configured in the form of a bitmap. In the present disclosure, the PPS may be referred to as PBPS.

FIG.9andFIG.10show a method for a UE to perform PBPS, based on an embodiment of the present disclosure. The embodiments ofFIG.9andFIG.10may be combined with various embodiments of the present disclosure.

In the embodiments ofFIG.9andFIG.10, it is assumed that resource reservation periods allowed for a resource pool or resource reservation periods configured for PBPS is P1 and P2. Furthermore, it is assumed that the UE performs partial sensing (i.e., PBPS) for selecting a SL resource in the slot #Y1.

Referring toFIG.9, the UE may perform sensing for a slot located before P1 from the slot #Y1 and a slot located before P2 from the slot #Y1. In the embodiment ofFIG.9, the UE may perform monitoring for the most recent sensing occasion.

Referring toFIG.10, the UE may perform sensing for a slot located before Pt from the slot #Y1 and a slot located before P2 from the slot #Y1. Furthermore, optionally, the UE may perform sensing for a slot located before 2*P1 from the slot #Y1 and a slot located before 2*P2 from the slot #Y1. In the embodiment ofFIG.10, the UE may perform monitoring for the most recent sensing occasion and the last sensing occasion before the most recent sensing occasion.

For example, in various embodiments of the present disclosure, continuous partial sensing (CPS) may refer to an operation of sensing all or a part of a time domain given as a specific configured value. For example, the CPS may include a short-term sensing operation in which sensing is performed for a relatively short duration.

FIG.11shows a method for a UE to perform CPS, based on an embodiment of the present disclosure. The embodiment ofFIG.11may be combined with various embodiments of the present disclosure.

In the embodiment ofFIG.11, it is assumed that Y candidate slots selected by the UE are the slot #M, the slot #(M+T1), and the slot #(M+T1+T2). In this case, slots in which the UE needs to perform sensing may be determined based on the first slot (i.e., slot #M) among Y candidate slots. For example, after determining the first slot among Y candidate slots as a reference slot, the UE may perform sensing for (previous) N slots from the reference slot.

Referring toFIG.11, based on the first slot (i.e., slot #M) among Y candidate slots, the UE may perform sensing for N slots. For example, the UE may perform sensing for N slots before the slot #M, and the UE may select at least one SL resource from among Y candidate slots (i.e., slot #M, slot #(M+T1), and slot #(M+T1+T2)) based on a result of the sensing. For example, N may be configured or pre-configured for the UE. For example, a time gap for processing may exist between the last slot among the N slots and the slot #M.

In the present disclosure, partial sensing may include PBPS or CPS.

In the present disclosure, partial sensing may refer to partial sensing including the PBPS operation and/or the CPS operation.

In the present disclosure. REV may refer to resource re-evaluation, and PEC may refer to resource pre-emption checking.

Hereinafter, the “candidate resource/slot” refers to a resource selected by the UE, which has selected a resource selection window to perform partial sensing, to detect whether there is a resource collision within the resource selection window when transmission resource selection is triggered for the first time to transmit any packet. The “available resource/slot” may refer to a resource which is determined to be available for transmission and reported from the PHY layer to the MAC layer because no resource collision is detected among candidate resources based on the partial sensing. The “transmission resource/slot” may refer to a resource finally selected by the MAC layer for SL transmission among the reported resources.

When a UE A performing a power saving operation selects transmission resource(s) from a SL resource pool in order to perform SL communication, the UE A may receive Inter-UE Coordination (IUC) information used/considered for resource selection of the UE A from other UE(s), and the UE A may select transmission resource(s) by considering the IUC information.

FIG.12shows a procedure in which a UE A performing a power saving operation selects transmission resource(s) from a SL resource pool in order to perform SL communication, based on an embodiment of the present disclosure. The embodiment ofFIG.12may be combined with various embodiments of the present disclosure.

Referring toFIG.12, in step S1200, the UE A and other UE(s) may obtain SL discontinuous reception (DRX) configuration. For example, the other UE(s) may be a UE B receiving data transmitted through transmission resource(s) to be selected by the UE A. For example, the other UE(s) may be a UE C which is performing another SL communication with the UE A, separately from SL communication through the transmission resource(s). For example, the other UE(s) may be a UE D which is monitoring a SL communication channel such as PSCCH/PSSCH/PSFCH transmitted for SL communication between the UE A and the UE B and/or the UE C.

For example, the SL DRX configuration may include at least one of information related to a SL DRX timer, information related to a SL DRX slot offset, information related to a SL DRX start offset, and/or information related to a SL DRX cycle

For example, the SL DRX timer may include at least one of a SL DRX onduration timer, a SL DRX inactivity timer, a SL DRX retransmission timer, and/or a SL DRX HARQ RTT timer. For example, the SL DRX onduration timer may be the duration at the beginning of an SL DRX cycle. For example, the SL DRX inactivity timer may be the duration after the first slot of SCI reception in which an SCI indicates a new SL transmission for the MAC entity. For example, the SL DRX retransmission timer may be the maximum duration until an SL retransmission is received. For example, the SL DRX HARQ RTT timer may be the minimum duration before an SL HARQ retransmission is expected by the MAC entity. For example, the SL DRX retransmission timer and the SL DRX HARQ RTT timer may be configured per sidelink process. For example, the SL DRX inactivity timer, SL DRX retransmission timer, and SL DRX HARQ RTT timer may not be applied to broadcast transmission. For example, the UE may start the SL DRX retransmission timer after the SL DRX HARQ RTT timer expires.

For example, the SL DRX slot offset may be a delay before the start of the SL DRX onduration timer. For example, the SL DRX start offset may be the slot where the SL DRX cycle starts.

For example, the running time of at least one of the SL DRX onduration timer, the SL DRX inactivity timer, and/or the SL DRX retransmission timer may be an active time. However, in various embodiments of the present disclosure, the active time is not limited to a time during which at least one of the SL DRX onduration timer, the SL DRX inactivity timer, and/or the SL DRX retransmission timer is running. For example, even if the SL DRX onduration timer, SL DRX inactivity timer, and SL DRX retransmission timer are not running, the RX UE may operate in an active time, and the RX UE may monitor a PSCCH from the TX UE.

In step S1210, the UE A may receive IUC information used/considered for resource selection of the UE A from the other UE(s). Alternatively, the UE A may not receive IUC information used/considered for resource selection of the UE A from the other UE(s). For example, the IUC information may include a preferred resource set and/or a non-preferred resource set.

In step S1220, the UE A may select transmission resource(s) by considering the IUC information. Based on various embodiments of the present disclosure, the UE A may perform the following operation based on reception of the IUC information or whether the IUC information is received.

1) In Case that the UE A (Re)Selects Transmission Resource(s) for Periodic Transmission

A. If the UE A receives the IUC information that can be used to (re)select transmission resource(s),

i. The UE A may not perform PPS for detecting resource collisions caused by predictable transmission of other UEs, and the UE A may perform only CPS for detecting resource collisions caused by unpredictable transmission of other UEs. Through this, the UE A may (re)select candidate/available/transmission resource(s) based on available sensing results such as the IUC information and the CPS result.

ii. The UE A may not perform CPS corresponding to short-term sensing, which is easy for other UEs to perform and to provide through IUC information, and the UE A may perform only PPS corresponding to long-term sensing, which is difficult for other UEs to perform and to provide through IUC information. Through this, the UE A may (re)select candidate/available/transmission resource(s) based on available sensing results such as the IUC information and the PPS result.

iii. For power saving, the UE A may not perform partial sensing such as PPS and CPS, and the UE A may (re)select candidate/available/transmission resource(s) based on the IUC information. For example, the UE A may randomly (re)select candidate/available/transmission resource(s) among resources within a packet delay budget (PDB) of a packet to be transmitted, among resources indicated/represented as preferred resources by the other UE(s) based on the TUC information. For example, the UE A may exclude resources indicated/represented by the other UE(s) as non-preferred resources or detected resources in the past/future, among resources indicated/represented as preferred resources by the other UE(s) based on the IUC information, from candidate/available/transmission resource(s).

iv. If the UE A performs PPS for transmission resource selection, and if the number of candidate resources for which a result of partial sensing or PPS is available is less than a specific threshold Ymin,

iv.1. If the UE A receives IUC information available for the transmission resource selection, the UE A may (re)select candidate/available/transmission resource(s) based on the IUC information and candidate resources for which the result of partial sensing or PPS is available.

iv.2. If the UE A receives TUC information available for the transmission resource selection, the UE A may (re)select candidate/available/transmission resource(s) based on the IUC information.

iv.3. If the UE A does not receive TUC information available for the transmission resource selection, the UE A may randomly select resource(s) in the SL resource pool, or the UE A may randomly (re)select resource(s) in the SL resource pool or an exceptional resource pool based on a priority of a transmission packet.

iv.4. If the UE A does not receive IUC information available for the transmission resource selection, and if a priority value of a transmission packet is less than or equal to a specific threshold, the UE A may randomly (re)select resource(s) in the SL resource pool. On the other hand, if a priority value of a transmission packet is greater than a specific threshold, the UE A may randomly (re)select resource(s) in an exceptional resource pool, or the UE A may randomly (re)select resource(s) in another SL resource pool that allows random resource selection for transmission of a transmission packet having the priority value.

v. If the length of a resource selection window selected by the UE A for periodic transmission resource selection is less than a specific threshold T2_min,

v.1. The UE A may (re)select resource(s) within a PDB required for a transmission packet, among transmittable resources related to the IUC information or preferred resources of the UE B, as candidate/available/transmission resource(s).

v.2. If there is no resource within the PDB required for the transmission packet among transmittable resources related to the IUC information or preferred resources of the UE B, the UE A may drop the transmission.

B. (Only) if the UE A does not receive the IUC information that can be used to (re)select transmission resource(s), the UE A may (re)select candidate/available/transmission resource(s) based on available sensing results such as the PPS and CPS results by performing partial sensing such as PPS and CPS.

2) In Case that the UE a (Re)Selects Transmission Resource(s) for Aperiodic Transmission

A. If the UE A receives the IUC information that can be used to (re)select transmission resource(s), the UE A may not perform CPS for aperiodic transmission, and the UE A may (re)select candidate/available/transmission resource(s) based on the IUC information.

B. (Only) if the UE A does not receive the IUC information that can be used to (re)select transmission resource(s),

i. The UE A may (re)select candidate/available/transmission resource(s) based on available sensing results such as the CPS result.

ii. If there is no available sensing result such as the CPS result or the number of available sensing results is less than a specific threshold,

ii.1. The UE A may randomly select resource(s) in the SL resource pool, or the UE A may randomly (re)select resource(s) in the SL resource pool or an exceptional resource pool based on a priority of a transmission packet.

ii.2. If a priority value of a transmission packet is less than or equal to a specific threshold, the UE A may randomly (re)select resource(s) in the SL resource pool. If a priority value of a transmission packet is greater than a specific threshold, the UE A may randomly (re)select resource(s) in an exceptional resource pool, or the UE A may randomly (re)select resource(s) in another SL resource pool that allows random resource selection for transmission of a transmission packet having the priority value.

3) In Case that the UE a Reselects Resource(s) Based on REV and/or PEC for the Selected Resource(s)

A. If the UE A receives the IUC information that can be used to reselect transmission resource(s) based on REV and/or PEC,

i. The UE A may not perform PPS for REV and/or PEC for detecting resource collisions caused by predictable transmission of other UEs, and the UE A may perform only CPS for REV and/or PEC for detecting resource collisions caused by unpredictable transmission of other UEs. Through this, the UE A may reselect candidate/available/transmission resource(s) based on available sensing results such as the TUC information and CPS results for the REV and/or PEC.

ii. The UE A may not perform CPS for REV and/or PEC corresponding to short-term sensing, which is easy for other UEs to perform and to provide through IUC information, and the UE A may perform only PPS for REV and/or PEC corresponding to long-term sensing, which is difficult for other UEs to perform and to provide through TUC information. Through this, the UE A may reselect candidate/available/transmission resource(s) based on available sensing results such as the IUC information and PPS results for the REV and/or PEC.

iii. For power saving, the UE A may not perform partial sensing such as PPS and CPS for REV and/or PEC, and the UE A may reselect candidate/available/transmission resource(s) based on the IUC information.

iv. If the UE A performs PPS for REV and/or PEC for reselection of transmission resource(s) based on REV and/or PEC, and if the number of candidate resources for which a result of partial sensing or PPS is available is less than a specific threshold Ymin,

iv.1. If the UE A receives IUC information available for the transmission resource selection, the UE A may reselect candidate/available/transmission resource(s) based on the TUC information and candidate resources for which the result of partial sensing or PPS is available.

iv.2. If the UE A receives TUC information available for the transmission resource selection, the UE A may reselect candidate/available/transmission resource(s) based on the IUC information.

iv.3. If the UE A does not receive IUC information available for the transmission resource selection, the UE A may randomly select resource(s) in the SL resource pool, or the UE A may randomly reselect resource(s) in the SL resource pool or an exceptional resource pool based on a priority of a transmission packet.

iv.4. If the UE A does not receive IUC information available for the transmission resource selection, and if a priority value of a transmission packet is less than or equal to a specific threshold, the UE A may randomly reselect resource(s) in the SL resource pool. On the other hand, if a priority value of a transmission packet is greater than a specific threshold, the UE A may randomly reselect resource(s) in an exceptional resource pool, or the UE A may randomly reselect resource(s) in another SL resource pool that allows random resource selection for transmission of a transmission packet having the priority value.

v. If the length of a resource selection window selected by the UE A for periodic transmission resource reselection for REV and/or PEC is less than a specific threshold T2_min,

v.1. The UE A may (re)select resource(s) within a PDB required for a transmission packet, among transmittable resources related to the IUC information or preferred resources of the UE B, as candidate/available/transmission resource(s).

v.2. If there is no resource within the PDB required for the transmission packet among transmittable resources related to the TUC information or preferred resources of the UE B, the UE A may drop the transmission.

B. (Only) if the UE A does not receive the IUC information that can be used to reselect transmission resource(s) based on REV and/or PEC, the UE A may perform partial sensing such as PPS and CPS for REV and/or PEC. Through this, the UE A may reselect candidate/available/transmission resource(s) based on available sensing results such as the PPS and CPS results.

Table 14 shows an example of SL channel busy ratio (CBR) and SL RSSI.

TABLE 14SL CBRDefinitionSL Channel Busy Ratio (SL CBR) measured in slot n is definedas the portion of sub-channels in the resource pool whose SLRSSI measured by the UE exceed a (pre-)configured thresholdsensed over a CBR measurement window [n − a, n − 1], whereina is equal to 100 or 100 · 2μslots, according to higherlayer parameter timeWindowSize-CBR.Applicable forRRC_IDLE intra-frequency,RRC_IDLE inter-frequency,RRC_CONNECTED intra-frequency,RRC_CONNECTED inter-frequencySL RSSIDefinitionSidelink Received Signal Strength Indicator (SL RSSI) is definedas the linear average of the total received power (in [W])observed in the configured sub-channel in OFDM symbols of a slotconfigured for PSCCH and PSSCH, starting from the 2nd OFDM symbol.For frequency range 1, the reference point for the SL RSSI shallbe the antenna connector of the UE. For frequency range 2, SL RSSIshall be measured based on the combined signal from antenna elementscorresponding to a given receiver branch. For frequency range 1 and2, if receiver deversity is in use by the UE, the reported SL RSSIvalue shall not be lower than the corresponding SL RSSI of any ofthe individual receiver branches.Applicable forRRC_IDLE intra-frequency,RRC_IDLE inter-frequency,RRC_CONNECTED intra-frequency,RRC_CONNECTED inter-frequency

Referring to Table 14, the slot index may be based on a physical slot index.

Table 15 shows an example of SL Channel Occupancy Ratio (CR).

TABLE 15DefinitionSideline Channel Occupancy Ratio (SL CR) evaluated at slotn is defined as the total number of sub-channels used forits transmissions in slots [n − a, n − 1]and granted in slots [n, n + b] divided bythe total number of configured sub-channels in thetransmission pool over [n − a, n + b].Applicable forRRC_IDLE intra-frequency,RRC_IDLE inter-frequency,RRC_CONNECTED intra-frequency,RRC_CONNECTED inter-frequencyNOTE 1:a is a positive integer and b is 0 or a positive integer; a and b are determined by UE implementation with a + b + 1 = 1000 or 1000 · 2μslots, according to higher layer parameter sl-TimeWindowSizeCR, b < (a + b + 1)/2, and n + b shall not exceed the last transmission opportunity of the grant for the current transmission.NOTE 2:SL CR is evaluated for each (re)transmission.NOTE 3:In evaluating SL CR, the UE shall assume the transmission parameter used at slot n is reused according to the existing grant(s) in slot [n + 1, n + b] without packet dropping.NOTE 4:The slot index is based on physical slot index.NOTE 5:SL CR can be computed per priority levelNOTE 6:A resource is considered granted if it is a member of a selected sidelink grant as defined in TS 38.321 [7].

4) In case that the UE A measures a channel busy ratio (CBR) for a transmission channel

A. If the UE A receives the IUC information that can be used for CBR measurement,

i. The UE A may calculate a CBR measurement value based on the IUC information.

ii. The UE A may calculate a final CBR measurement value based on the IUC information and a CBR measurement value measured by the UE A.

iii. The UE A may calculate a final CBR measurement value based on the IUC information and a CBR value configured to a specific configuration value.

iv. The UE A may calculate a final CBR measurement value based on the IUC information, the CBR value configured to the specific configuration value, and the CBR measurement value measured by the UE A.

v. The UE A may calculate a final CBR measurement value based on the IUC information and the CBR measurement value measured by the UE A (only) if the number of measurement values for CBR measurement is insufficient.

vi. The UE A may calculate a final CBR measurement value based on the IUC information and the CBR value configured to the specific configuration value (only) if the number of measurement values for CBR measurement is insufficient.

vii. The UE A may calculate a final CBR measurement value based on the IUC information, the CBR value configured to the specific configuration value, and the CBR measurement value measured by the UE A (only) if the number of measurement values for CBR measurement is insufficient.

B. (Only) if the UE A does not receive the TUC information that can be used for CBR measurement,

i. The UE A may calculate a final CBR measurement value based on a CBR measurement value measured by the UE A.

ii. The UE A may calculate a final CBR measurement value based on a CBR value configured to a specific configuration value.

iii. The UE A may calculate a final CBR measurement value based on the CBR value configured to the specific configuration value and the CBR measurement value measured by the UE A.

iv. The UE A may calculate a final CBR measurement value based on the CBR measurement value measured by the UE A (only) if the number of measurement values for CBR measurement is insufficient.

v. The UE A may calculate a final CBR measurement value based on the CBR value configured to the specific configuration value (only) if the number of measurement values for CBR measurement is insufficient.

vi. The UE A may calculate a final CBR measurement value based on the CBR value configured to the specific configuration value and the CBR measurement value measured by the UE A (only) if the number of measurement values for CBR measurement is insufficient.

5) In Case that the UE A Performs a SL DRX Operation

A. If the UE A receives the IUC information that can be used to (re)select transmission resource(s),

i. The UE A may perform partial sensing such as PPS and/or CPS as described above in steps 1), 2), and 3) only in a SL DRX onduration and/or an active duration of the UE A. and the UE A may utilize the IUC information as partial sensing information for the corresponding duration in a SL DRX off duration and/or an inactive duration of the UE A. For example, the UE A may (re)select candidate/available/transmission resource(s) for a packet to be transmitted, based on the TUC information and the result of the partial sensing performed by the UE A in the onduration and/or the active duration.

B. (Only) if the UE A does not receive the IUC information that can be used to (re)select transmission resource(s),

i. The UE A may perform a partial sensing operation required for periodic/aperiodic packet transmission, in a SL DRX onduration and/or an active duration and a SL DRX off duration and/or an inactive duration, and the UE A may (re)select candidate/available/transmission resource(s) for a packet to be transmitted based on the result of the partial sensing.

6) In Case that the UE B Performs a SL DRX Operation

A. If the UE A receives the IUC information that can be used to (re)select transmission resource(s),

i. The UE A may (re)select the number of candidate/available/transmission resources greater than or equal to a specific threshold, based on the result of the partial sensing performed by the UE A, only within a SL DRX onduration and/or an active onduration of the UE B at the time of selecting transmission resource(s). The UE A may (re)select remaining candidate/available/transmission resources, based on the IUC information, within an extended active duration of the UE B that can be extended by the UE B after the above duration, wherein the number of remaining candidate/available/transmission resources is equal to a value obtained by subtracting the number of candidate/available/transmission resources selected within the SL DRX onduration and/or the active duration of the UE B from the total number of minimum candidate/available/transmission resources required for successful packet transmission. For example, the SL DRX onduration and/or the active duration of the UE B at the time of selecting transmission resource(s) may be referred to as a current active time, and the extended active duration of the UE B that can be extended by the UE B may be referred to as a future active time.

B. (Only) if the UE A does not receive the TUC information that can be used to (re)select transmission resource(s),

i. The UE A may (re)select the number of candidate/available/transmission resources greater than or equal to a specific threshold, based only on the result of the partial sensing performed by the UE A, only within a SL DRX onduration and/or an active onduration of the UE B at the time of selecting transmission resource(s). The UE A may (re)select remaining candidate/available/transmission resources, within an extended active duration of the UE B that can be extended by the UE B after the above duration, wherein the number of remaining candidate/available/transmission resources is equal to a value obtained by subtracting the number of candidate/available/transmission resources selected within the SL DRX onduration and/or the active duration of the UE B from the total number of minimum candidate/available/transmission resources required for successful packet transmission.

Based on various embodiments of the present disclosure, the UE may select a resource allocation scheme based on inter-UE coordination information. Through this, there is an effect of avoiding transmission collision as much as possible by excluding resources according to transmission collision. Specifically, for example, even if resource selection based on partial sensing is configured for the UE A, the UE A may skip performing the partial sensing for power saving. In this case, if the UE A receives IUC information including information related to a preferred resource set, the UE A not having a sensing result may select transmission resource(s) from resources belonging to the preferred resource set included in the IUC information. Through this, the power saving gain of the UE A can be maximized, and resource collision can be minimized, and reliability of SL communication can be improved.

For example, whether the rule is applied and/or the parameter value related to the proposed method/rule may be configured/allowed specifically (or differently or independently) for a service type. For example, whether the rule is applied and/or the parameter value related to the proposed method/rule may be configured/allowed specifically (or differently or independently) for a (LCH or service) priority. For example, whether the rule is applied and/or the parameter value related to the proposed method/rule may be configured/allowed specifically (or differently or independently) for a QoS requirement (e.g., latency, reliability, minimum communication range). For example, whether the rule is applied and/or the parameter value related to the proposed method/rule may be configured/allowed specifically (or differently or independently) for a PQI parameter. For example, whether the rule is applied and/or the parameter value related to the proposed method/rule may be configured/allowed specifically (or differently or independently) for HARQ feedback enabled LCH/MAC PDU (transmission). For example, whether the rule is applied and/or the parameter value related to the proposed method/rule may be configured/allowed specifically (or differently or independently) for HARQ feedback disabled LCH/MAC PDU (transmission). For example, whether the rule is applied and/or the parameter value related to the proposed method/rule may be configured/allowed specifically (or differently or independently) for a CBR measurement value of a resource pool. For example, whether the rule is applied and/or the parameter value related to the proposed method/rule may be configured/allowed specifically (or differently or independently) for a SL cast type (e.g., unicast, groupcast, broadcast). For example, whether the rule is applied and/or the parameter value related to the proposed method/rule may be configured/allowed specifically (or differently or independently) for a SL groupcast HARQ feedback option (e.g., NACK only feedback, ACK/NACK feedback, NACK only feedback based on TX-RX distance). For example, whether the rule is applied and/or the parameter value related to the proposed method/rule may be configured/allowed specifically (or differently or independently) for a SL mode 1 CG type (e.g., SL CG type 1 or SL CG type 2). For example, whether the rule is applied and/or the parameter value related to the proposed method/rule may be configured/allowed specifically (or differently or independently) for a SL mode type (e.g., mode 1 or mode 2). For example, whether the rule is applied and/or the parameter value related to the proposed method/rule may be configured/allowed specifically (or differently or independently) for a resource pool. For example, whether the rule is applied and/or the parameter value related to the proposed method/rule may be configured/allowed specifically (or differently or independently) for whether a PSFCH resource is configured in a resource pool. For example, whether the rule is applied and/or the parameter value related to the proposed method/rule may be configured/allowed specifically (or differently or independently) for a source (L2) ID. For example, whether the rule is applied and/or the parameter value related to the proposed method/rule may be configured/allowed specifically (or differently or independently) for a destination (L2) ID. For example, whether the rule is applied and/or the parameter value related to the proposed method/rule may be configured/allowed specifically (or differently or independently) for a PC5 RRC connection link. For example, whether the rule is applied and/or the parameter value related to the proposed method/rule may be configured/allowed specifically (or differently or independently) for a SL link. For example, whether the rule is applied and/or the parameter value related to the proposed method/rule may be configured/allowed specifically (or differently or independently) for a connection state (with a base station)(e.g., RRC CONNECTED state, IDLE state, INACTIVE state). For example, whether the rule is applied and/or the parameter value related to the proposed method/rule may be configured/allowed specifically (or differently or independently) for a SL HARQ process (ID). For example, whether the rule is applied and/or the parameter value related to the proposed method/rule may be configured/allowed specifically (or differently or independently) for whether to perform SL DRX operation (of TX UE or RX UE). For example, whether the rule is applied and/or the parameter value related to the proposed method/rule may be configured/allowed specifically (or differently or independently) for whether a UE is a power saving (TX or RX) UE. For example, whether the rule is applied and/or the parameter value related to the proposed method/rule may be configured/allowed specifically (or differently or independently) for a case in which PSFCH TX and PSFCH RX (and/or a plurality of PSFCH TXs (exceeding UE capability)) overlap (and/or a case in which PSFCH TX (and/or PSFCH RX) is skipped)(from a specific UE perspective). For example, whether the rule is applied and/or the parameter value related to the proposed method/rule may be configured/allowed specifically (or differently or independently) for a case in which the RX UE actually (successfully) receives PSCCH (and/or PSSCH) (re)transmission from the TX UE.

For example, in the present disclosure, the term “configured/configuration (or designated/designation)” can be extended/interpreted to/as that the base station informs the UE through a pre-defined (physical layer or higher layer) channel/signal (e.g., SIB, RRC, MAC CE) (and/or being provided through pre-configuration and/or that the UE informs other UEs through a pre-defined (physical layer or higher layer) channel/signal (e.g., SL MAC CE, PC5 RRC)).

For example, in the present disclosure, the term “PSFCH” can be extended/interpreted to/as (NR or LTE) PSSCH (and/or (NR or LTE) PSCCH) (and/or (NR or LTE) SL SSB (and/or UL channel/signal)). In addition, the proposed methods of the present disclosure can be used in combination with each other (as a new type of manner).

For example, in the present disclosure, the specific threshold may refer to a threshold pre-defined or (pre-)configured by a higher layer (including an application layer) of the network, the base station, or the UE. For example, in the present disclosure, the specific configured value may refer to a value pre-defined or (pre-)configured by a higher layer (including an application layer) of the network, the base station, or the UE. For example, the operation configured by the network/base station may refer to that the base station (pre-)configures to the UE through higher layer RRC signaling or the base station configures/signals to the UE through MAC CE or the base station signals to the UE through DCI.

FIG.13shows a method for performing wireless communication by a first device, based on an embodiment of the present disclosure. The embodiment ofFIG.13may be combined with various embodiments of the present disclosure.

Referring toFIG.13, in step S1310, the first device may obtain a configuration for resource selection based on partial sensing. For example, the partial sensing may include periodic-based partial sensing (PBPS) or contiguous partial sensing (CPS). In step S1320, the first device may receive, from a second device, inter-UE coordination (IUC) information including information related to a preferred resource set. In step S1330, the first device may obtain sidelink (SL) data. In step S1340, the first device may select a transmission resource for the SL data from resources belonging to the preferred resource set included in the IUC information, based on skipping the partial sensing for power saving. For example, the SL data may be SL-SCH data.

For example, the first device may not have its own sensing result based on skipping the partial sensing for the power saving.

For example, the transmission resource for the SL data may be randomly selected from the resources belonging to the preferred resource set based on a packet delay budget (PDB) of available SL data. Additionally, for example, the first device may obtain a medium access control (MAC) protocol data unit (PDU) based on the available SL data.

For example, based on that a number of available candidate resources selected based on the partial sensing is less than a threshold, the transmission resource for the SL data may be selected based on the available candidate resources and the IUC information.

For example, based on that a number of available candidate resources selected based on the partial sensing is less than a threshold, the transmission resource for the SL data may be selected based on the TUC information.

For example, based on the reception of the IUC information including the information related to the preferred resource set, the first device may not be allowed to perform the partial sensing.

Additionally, for example, the first device may perform CBR measurement for obtaining a channel busy ratio (CBR) value based on the IUC information. For example, based on that a number of measurement values for the CBR measurement is less than or equal to a threshold, the CBR value may be obtained based on the TUC information and a CBR measurement value measured by the first device. For example, based on that a number of measurement values for the CBR measurement is less than or equal to a threshold, the CBR value may be obtained based on the IUC information and a CBR value configured for the first device.

Additionally, for example, the first device may obtain a SL discontinuous reception (DRX) configuration including information related to a timer for an active time. For example, outside of the active time, the transmission resource for the SL data may be selected based on the IUC information. For example, within the active time, the transmission resource for the SL data may be selected based on the IUC information and a result of the partial sensing.

Additionally, for example, the first device may obtain information related to a minimum number of resources for SL transmission. For example, N resources may be selected by the first device within a current active time based on a result of the partial sensing, and M resources may be selected by the first device within a future active time based on the IUC information, and a sum of N and M may be equal to the minimum number.

The proposed method can be applied to the device(s) based on various embodiments of the present disclosure. First, the processor102of the first device100may obtain a configuration for resource selection based on partial sensing. For example, the partial sensing may include periodic-based partial sensing (PBPS) or contiguous partial sensing (CPS). In addition, the processor102of the first device100may control the transceiver106to receive, from a second device, inter-UE coordination (IUC) information including information related to a preferred resource set. In addition, the processor102of the first device100may obtain sidelink (SL) data. In addition, the processor102of the first device100may select a transmission resource for the SL data from resources belonging to the preferred resource set included in the IUC information, based on skipping the partial sensing for power saving.

Based on an 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: obtain a configuration for resource selection based on partial sensing, wherein the partial sensing includes periodic-based partial sensing (PBPS) or contiguous partial sensing (CPS); control the one or more transceivers to receive, from a second device, inter-UE coordination (IUC) information including information related to a preferred resource set; obtain sidelink (SL) data and select a transmission resource for the SL data from resources belonging to the preferred resource set included in the IUC information, based on skipping the partial sensing for power saving.

Based on an embodiment of the present disclosure, a processing device adapted to control a first device may be provided. For example, the processing device 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: obtain a configuration for resource selection based on partial sensing, wherein the partial sensing includes periodic-based partial sensing (PBPS) or contiguous partial sensing (CPS): receive, from a second device, inter-UE coordination (IUC) information including information related to a preferred resource set; obtain sidelink (SL) data; and select a transmission resource for the SL data from resources belonging to the preferred resource set included in the IUC information, based on skipping the partial sensing for power saving.

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 first device to: obtain a configuration for resource selection based on partial sensing, wherein the partial sensing includes periodic-based partial sensing (PBPS) or contiguous partial sensing (CPS): receive, from a second device, inter-UE coordination (IUC) information including information related to a preferred resource set; obtain sidelink (SL) data; and select a transmission resource for the SL data from resources belonging to the preferred resource set included in the IUC information, based on skipping the partial sensing for power saving.

FIG.14shows a method for performing wireless communication by a second device, based on an embodiment of the present disclosure. The embodiment ofFIG.14may be combined with various embodiments of the present disclosure.

Referring toFIG.14, in step S1410, the second device may transmit, to a first device, inter-UE coordination (IUC) information including information related to a preferred resource set. In step S1420, the second device may receive, from the 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, based on a sidelink (SL) resource. In step S1430, the second device may receive, from the first device through the PSSCH, the second SCI and SL data based on the SL resource. For example, based on that partial sensing is skipped by the first device for power saving, the SL resource may be selected from resources belonging to the preferred resource set included in the IUC information.

The proposed method can be applied to the device(s) based on various embodiments of the present disclosure. First, the processor202of the second device200may control the transceiver206to transmit, to a first device, inter-UE coordination (IUC) information including information related to a preferred resource set. In addition, the processor202of the second device200may control the transceiver206to receive, from the 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, based on a sidelink (SL) resource. In addition, the processor202of the second device200may control the transceiver206to receive, from the first device through the PSSCH, the second SCI and SL data based on the SL resource. For example, based on that partial sensing is skipped by the first device for power saving, the SL resource may be selected from resources belonging to the preferred resource set included in the IUC information. For example, the SL data may be SL-SCH data.

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: control the one or more transceivers to transmit, to a first device, inter-UE coordination (IUC) information including information related to a preferred resource set; control the one or more transceivers to receive, from the 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, based on a sidelink (SL) resource; and control the one or more transceivers to receive, from the first device through the PSSCH, the second SCI and SL data based on the SL resource. For example, based on that partial sensing is skipped by the first device for power saving, the SL resource may be selected from resources belonging to the preferred resource set included in the IUC information.

Based on an embodiment of the present disclosure, a processing device adapted to control a second device may be provided. For example, the processing device 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: transmit, to a first device, inter-UE coordination (IUC) information including information related to a preferred resource set; receive, from the 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, based on a sidelink (SL) resource; and receive, from the first device through the PSSCH, the second SCI and SL data based on the SL resource. For example, based on that partial sensing is skipped by the first device for power saving, the SL resource may be selected from resources belonging to the preferred resource set included in the IUC information.

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: transmit, to a first device, inter-UE coordination (IUC) information including information related to a preferred resource set: receive, from the 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, based on a sidelink (SL) resource; and receive, from the first device through the PSSCH, the second SCI and SL data based on the SL resource. For example, based on that partial sensing is skipped by the first device for power saving, the SL resource may be selected from resources belonging to the preferred resource set included in the TUC information.

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

Hereinafter, device(s) to which various embodiments of the present disclosure can be applied will be described.

FIG.15shows a communication system1, based on an embodiment of the present disclosure. The embodiment ofFIG.15may be combined with various embodiments of the present disclosure.

Here, wireless communication technology implemented in wireless devices100ato100fof the present disclosure may include Narrowband Internet of Things for low-power communication in addition to LTE. NR, and 6G. 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 devices100ato100fof 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 1) LTE CAT 0, 2) LTE Cat M1, 3) LTE Cat M2, 4) LTE non-Bandwidth Limited (non-BL), 5) LTE-MTC, 6) LTE Machine Type Communication, and/or 7) LTE M. and is not limited to the name described above. Additionally or alternatively, the wireless communication technology implemented in the wireless devices100ato100fof 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 802.15.4, and the like, and may be called by various names.

FIG.16shows wireless devices, based on an embodiment of the present disclosure. The embodiment ofFIG.16may be combined with various embodiments of the present disclosure.

FIG.17shows a signal process circuit for a transmission signal, based on an embodiment of the present disclosure. The embodiment ofFIG.17may be combined with various embodiments of the present disclosure.

Referring toFIG.17, a signal processing circuit1000may include scramblers1010, modulators1020, a layer mapper1030, a precoder1040, resource mappers1050, and signal generators1060. An operation/function ofFIG.17may be performed, without being limited to, the processors102and202and/or the transceivers106and206ofFIG.16. Hardware elements ofFIG.17may be implemented by the processors102and202and/or the transceivers106and206ofFIG.16. For example, blocks1010to1060may be implemented by the processors102and202ofFIG.16. Alternatively, the blocks1010to1050may be implemented by the processors102and202ofFIG.16and the block1060may be implemented by the transceivers106and206ofFIG.16.

FIG.18shows another example of a wireless device, based on an embodiment of the present disclosure. The wireless device may be implemented in various forms according to a use-case/service (refer toFIG.15). The embodiment ofFIG.18may be combined with various embodiments of the present disclosure.

Hereinafter, an example of implementingFIG.18will be described in detail with reference to the drawings.

Referring toFIG.20, a vehicle or autonomous vehicle10may include an antenna unit108, a communication unit110, a control unit120, a driving unit140a, a power supply unit140b, a sensor unit140c, and an autonomous driving unit140d. The antenna unit108may be configured as apart of the communication unit110. The blocks110/130/140ato140dcorrespond to the blocks110/130/140ofFIG.18, respectively.