Patent Description:
Sidelink (SL) communication is a communication scheme in which a direct link is established between User Equipments (UEs) and the UEs exchange voice and data directly with each other without intervention of an evolved Node B (eNB). SL communication is under consideration as a solution to the overhead of an eNB caused by rapidly increasing data traffic.

Vehicle-to-everything (V2X) refers to a communication technology through which a vehicle exchanges information with another vehicle, a pedestrian, an object having an infrastructure (or infra) established therein, and so on. The V2X may be divided into <NUM> types, such as vehicle-to-vehicle (V2V), vehicle-to-infrastructure (V2I), vehicle-to-network (V2N), and vehicle-to-pedestrian (V2P). The V2X communication may be provided via a PC5 interface and/or Uu interface.

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

For example, the CAM may include dynamic state information of the vehicle such as direction and speed, static data of the vehicle such as a size, and basic vehicle information such as an exterior illumination state, route details, or the like. For example, the UE may broadcast the CAM, and latency of the CAM may be less than <NUM>. For example, the UE may generate the DENM and transmit it to another UE in an unexpected situation such as a vehicle breakdown, accident, or the like. For example, all vehicles within a transmission range of the UE may receive the CAM and/or the DENM. In this case, the DENM may have a higher priority than the CAM.

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

For example, based on the vehicle platooning, vehicles may move together by dynamically forming a group. For example, in order to perform platoon operations based on the vehicle platooning, the vehicles belonging to the group may receive periodic data from a leading vehicle. For example, the vehicles belonging to the group may decrease or increase an interval between the vehicles by using the periodic data.

For example, based on the advanced driving, the vehicle may be semi-automated or fully automated. For example, each vehicle may adjust trajectories or maneuvers, based on data obtained from a local sensor of a proximity vehicle and/or a proximity logical entity. In addition, for example, each vehicle may share driving intention with proximity vehicles.

For example, based on the extended sensors, raw data, processed data, or live video data obtained through the local sensors may be exchanged between a vehicle, a logical entity, a UE of pedestrians, and/or a V2X application server. Therefore, for example, the vehicle may recognize a more improved environment than an environment in which a self-sensor is used for detection.

For example, based on the remote driving, for a person who cannot drive or a remote vehicle in a dangerous environment, a remote driver or a V2X application may operate or control the remote vehicle. For example, if a route is predictable such as public transportation, cloud computing based driving may be used for the operation or control of the remote vehicle. In addition, for example, an access for a cloud-based back-end service platform may be considered for the remote driving.

Meanwhile, a scheme of specifying service requirements for various V2X scenarios such as vehicle platooning, advanced driving, extended sensors, remote driving, or the like is discussed in NR-based V2X communication. The 3GPP Draft No. R1-<NUM>, entitled "Discussion on Physical Layer Procedures", discusses physical layer procedures on HARQ transmission, MIMO and CSI and power control for NR V2X sidelink.

Meanwhile, in SL communication, a transmitting UE needs to efficiently determine SL transmit power in consideration of pathloss between the transmitting UE and receiving UE(s).

According to a first aspect, a method for performing wireless communication by a first device is provided as set forth in the appended claims.

According to another aspect, a first device configured to perform wireless communication is provided as set forth in the appended claims. According to yet another aspect, an apparatus of a first UE is provided as set forth in the appended claims. In the following, embodiments and/or examples not falling within the scope of the claims should be understood as mere examples useful for understanding the present invention.

The user equipment (UE) may efficiently perform SL communication.

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

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

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

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

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

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

<FIG> shows a functional division between an NG-RAN and a 5GC, based on an embodiment of the present disclosure.

Referring to <FIG>, the gNB may provide functions, such as Inter Cell Radio Resource Management (RRM), Radio Bearer (RB) control, Connection Mobility Control, Radio Admission Control, Measurement Configuration & Provision, Dynamic Resource Allocation, and so on. An AMF may provide functions, such as Non Access Stratum (NAS) security, idle state mobility processing, and so on. A UPF may provide functions, such as Mobility Anchoring, Protocol Data Unit (PDU) processing, and so on. A Session Management Function (SMF) may provide functions, such as user equipment (UE) Internet Protocol (IP) address allocation, PDU session control, and so on.

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

<FIG> shows a radio protocol architecture, based on an embodiment of the present disclosure. Specifically, <FIG> shows a radio protocol architecture for a user plane, and <FIG> shows a radio protocol architecture for a control plane. The user plane corresponds to a protocol stack for user data transmission, and the control plane corresponds to a protocol stack for control signal transmission.

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., the MAC layer, the RLC layer, and the packet data convergence protocol (PDCP) layer) for data delivery between the UE and the network.

The physical channel includes several OFDM symbols in a time domain and several sub-carriers in a frequency domain. One sub-frame includes a plurality of OFDM symbols in the time domain. A resource block is a unit of resource allocation, and consists of a plurality of OFDM symbols and a plurality of sub-carriers. Further, each subframe may use specific sub-carriers of specific OFDM symbols (e.g., a first OFDM symbol) of a corresponding subframe for a physical downlink control channel (PDCCH), i.e., an L1/L2 control channel. A transmission time interval (TTI) is a unit time of subframe transmission.

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

Meanwhile, a radio interface between a UE and another UE or a radio interface between the UE and a network may consist of an L1 layer, an L2 layer, and an L3 layer. In various embodiments of the present disclosure, the L1 layer may imply a physical layer. In addition, for example, the L2 layer may imply at least one of a MAC layer, an RLC layer, a PDCP layer, and an SDAP layer. In addition, for example, the L3 layer may imply an RRC layer.

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

When using bandwidth adaptation (BA), a reception bandwidth and transmission bandwidth of a UE are not necessarily as large as a bandwidth of a cell, and the reception bandwidth and transmission bandwidth of the BS may be adjusted. For example, a network/BS may inform the UE of bandwidth adjustment. For example, the UE receive information/configuration for bandwidth adjustment from the network/BS. In this case, the UE may perform bandwidth adjustment based on the received information/configuration. For example, the bandwidth adjustment may include an increase/decrease of the bandwidth, a position change of the bandwidth, or a change in subcarrier spacing of the bandwidth.

For example, the bandwidth may be decreased during a period in which activity is low to save power. For example, the position of the bandwidth may move in a frequency domain. For example, the position of the bandwidth may move in the frequency domain to increase scheduling flexibility. For example, the subcarrier spacing of the bandwidth may be changed. For example, the subcarrier spacing of the bandwidth may be changed to allow a different service. A subset of a total cell bandwidth of a cell may be called a bandwidth part (BWP). The BA may be performed when the BS/network configures the BWP to the UE and the BS/network informs the UE of the BWP currently in an active state among the configured BWPs.

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

<FIG> shows a radio protocol architecture for a SL communication, based on an embodiment of the present disclosure. More specifically, <FIG> shows a user plane protocol stack, and <FIG> shows a control plane protocol stack.

Hereinafter, a sidelink synchronization signal (SLSS) and synchronization information will be described.

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

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

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

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

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

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

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

Referring to <FIG>, in the LTE transmission mode <NUM>, the LTE transmission mode <NUM>, or the NR resource allocation mode <NUM>, a BS may schedule an SL resource to be used by the UE for SL transmission. For example, the BS may perform resource scheduling to a UE <NUM> through a PDCCH (more specifically, downlink control information (DCI)), and the UE 1may perform V2X or SL communication with respect to a UE <NUM> according to the resource scheduling. For example, the UE <NUM> may transmit a sidelink control information (SCI) to the UE <NUM> through a physical sidelink control channel (PSCCH), and thereafter transmit data based on the SCI to the UE <NUM> through a physical sidelink shared channel (PSSCH).

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

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

Hereinafter, power control will be described.

A method in which a UE controls uplink transmit power thereof may include open loop power control (OLPC) and closed loop power control (CLPC). Based on the OLPC, the UE may estimate a downlink pathloss from a BS of a cell to which the UE belongs, and the UE may perform power control in such a manner that the pathloss is compensated for. For example, based on the OLPC, if a distance between the UE and the BS further increases and thus a downlink pathloss increases, the UE may control uplink power in such a manner that uplink transmit power is further increased. Based on the CLPC, the UE may receive information (e.g., a control signal) required to adjust uplink transmit power from the BS, and the UE may control uplink power based on the information received from the BS. That is, based on the CLPC, the UE may control the uplink power based on a direct power control command received from the BS.

The OLPC may be supported in SL. Specifically, when the transmitting UE is inside the coverage of the BS, the BS may enable OPLC for unicast, groupcast, and broadcast transmission based on the pathloss between the transmitting UE and a serving BS of the transmitting UE. If the transmitting UE receives information/configuration for enabling the OLPC from the BS, the transmitting UE may enable OLPC for unicast, groupcast, or broadcast transmission. This may be to mitigate interference for uplink reception of the BS.

Additionally, at least in case of unicast, a configuration may be enabled to use the pathloss between the transmitting UE and the receiving UE. For example, the configuration may be pre-configured for the UE. The receiving UE may report an SL channel measurement result (e.g., SL RSRP) to the transmitting UE, and the transmitting UE may derive pathloss estimation from the SL channel measurement result reported by the receiving UE. For example, in SL, if the transmitting UE transmits a reference signal to the receiving UE, the receiving UE may estimate a channel between the transmitting UE and the receiving UE based on the reference signal transmitted by the transmitting UE. In addition, the receiving UE may transmit the SL channel measurement result to the transmitting UE. In addition, the transmitting UE may estimate the SL pathloss from the receiving UE based on the SL channel measurement result. In addition, the transmitting UE may perform SL power control by compensating for the estimated pathloss, and may perform SL transmission for the receiving UE. Based on the OLPC in SL, for example, if a distance between the transmitting UE and the receiving UE further increases and thus the SL pathloss increases, the transmitting UE may control SL transmit power in such a manner that the SL transmit power is further increased. The power control may be applied in SL physical channel (e.g., PSCCH, PSSCH, physical sidelink feedback channel (PSFCH)) and/or SL signal transmission.

In order to support the OLPC, at least in case of unicast, long-term measurement (e.g., L3 filtering) may be supported on SL.

For example, total SL transmit power may be identical in symbols used for PSCCH and/or PSSCH transmission in a slot. For example, maximum SL transmit power may be configured for the transmitting UE or may be pre-configured.

For example, in case of the SL OLPC, the transmitting UE may be configured to use only a downlink pathloss (e.g., a pathloss between the transmitting UE and the BS). For example, in case of the SL OLPC, the transmitting UE may be configured to use only an SL pathloss (e.g., a pathloss between the transmitting UE and the receiving UE). For example, in case of the SL OLPC, the transmitting UE may be configured to use a downlink pathloss and the SL pathloss.

For example, if the SL OLPC is configured to use both the downlink pathloss and the SL pathloss, the transmitting UE may determine a minimum value as transmit power among power obtained based on the downlink pathloss and power obtained based on the SL pathloss. For example, P0 and an alpha value may be configured separately for the downlink pathloss and the SL pathloss or may be pre-configured. For example, P0 may be a user-specific parameter related to SINR received on average. For example, the alpha value may be a weight value for the pathloss.

Hereinafter, L3 filtering will be described.

A UE may measure reference signals received power (RSRP) based on reference signal(s). In addition, the UE may perform L1 filtering and/or L3 filtering for the RSRP. For example, based on Table <NUM>, the UE may perform L3 filtering for the RSRP measured based on the reference signal(s).

Referring to Table <NUM>, for each cell measurement quantity and for each beam measurement quantity that the UE performs measurements, the UE may perform filter the measured result, before using for evaluation of reporting criteria or for measurement reporting, based on Equation <NUM>.

For details on L3 filtering, refer to 3GPP TS <NUM> V15.

In the present disclosure, for example, a transmitting UE may be referred to as a TX UE, and a receiving UE may be referred to as a RX UE.

In the present disclosure, for example, "RSRP" may be replaced with "L3 RSRP measurement value", or vice versa. For example, "RSRP" may be replaced with "L1 RSRP measurement value", or vice versa.

In the present disclosure, for example, "configuration" may include that UE(s) receives or receives in advance information related to the configuration through pre-defined signaling from network(s). For example, "definition" may include that UE(s) receives or receives in advance information related to the definition through pre-defined signaling from network(s). For example, "definition" may include that information related to the definition is defined in advance for UE(s). For example, the network(s) may be base station(s) and/or V2X server(s). For example, the pre-defined signaling may include at least one of SIB, MAC signaling, and/or RRC signaling.

Based on an embodiment of the present disclosure, a TX UE performing SL communication is configured to determine transmit power based on a value of SL pathloss between the TX UE and a RX UE. The TX UE determines power for SL transmission based on the value of SL pathloss between the TX UE and the RX UE. For example, the TX UE may be a UE performing unicast communication with the RX UE. For example, the TX UE may be a UE performing groupcast communication with the RX UE. For example, the TX UE may estimate/obtain the value of SL pathloss between the TX UE and the RX UE based on value(s) of RSRP reported by the RX UE.

<FIG> shows a procedure for a UE to determine transmit power, based on an embodiment of the present disclosure.

Referring to <FIG>, in step S <NUM>, a TX UE may transmit reference signal(s) (RS(s)) to a RX UE. For example, the RS(s) may be RS(s) used for estimating/obtaining value(s) of RSRP. For example, the RS(s) may be RS(s) used by the RX UE to estimate/obtain value(s) of RSRP. For example, the RS(s) may be CSI-RS(s) and/or demodulation reference signal(s) (DM-RS(s)). For example, the DM-RS(s) may be PSSCH DM-RS(s) and/or PSCCH DM-RS(s). For example, transmit power of the RS(s) transmitted by the TX UE may be time-varying.

In step S <NUM>, the RX UE may estimate or obtain value(s) of RSRP based on the RS(s). In addition, the RX UE may transmit information related to RSRP to the TX UE. For example, the information related to RSRP may include value(s) of RSRP measured by the RX UE based on the RS(s).

In step S <NUM>, the TX UE calculates or estimates/obtains a value of pathloss between the TX UE and the RX UE. For example, the TX UE calculates or estimates/obtains a value of pathloss between the TX UE and the RX UE based on value(s) of RSRP and transmit power of the RS(s). For example, a procedure for the TX UE to obtain a value of pathloss may be one of the first case, the second case and/or the third case.

For example, transmit power of the RS(s) transmitted by the TX UE may be time-varying. In this case, the TX UE may receive value(s) of layer-<NUM> (L1) RSRP from the RX UE. Thereafter, the TX UE may perform L3 filtering or L3 averaging for value(s) of L1 RSRP, which is value(s) compensated by difference value(s) between a reference value of transmit power of RS(s) (hereinafter, RS_PW_REF value) and transmit power of RS(s) related to the value(s) of L1 RSRP (reported from the RX UE). Accordingly, the TX UE may obtain or determine an averaged value of RSRP based on L3 filtering. For example, the RS_PW_REF value may be pre-configured for the UE. In addition, finally, the TX UE may calculate or estimate/obtain a value of SL pathloss based on Equation <NUM>.

For example, transmit power of the RS(s) transmitted by the TX UE may be time-varying. In this case, the RX UE may obtain value(s) of RSRP based on the RS(s) transmitted by the TX UE, and the RX UE may perform L3 filtering or L3 averaging for the value(s) of RSRP. Thereafter, the TX UE may receive an averaged value of RSRP based on L3 filtering, from the RX UE. In addition, the TX UE may obtain or determine a UP_L3RSRP value, which is a value compensated by difference value(s) between the RS_PW_REF value and transmit power of RS(s) related to the L3 filtered or L3 averaged RSRP value (reported from the RX UE). In addition, finally, the TX UE may calculate or estimate/obtain a value of SL pathloss based on Equation <NUM>.

For example, transmit power of the RS(s) transmitted by the TX UE may be time-varying. In this case, the RX UE may obtain value(s) of RSRP based on the RS(s) transmitted by the TX UE, and the RX UE may perform L3 filtering or L3 averaging for the value(s) of RSRP. Thereafter, the TX UE may receive an averaged value of RSRP based on L3 filtering, from the RX UE. In addition, the TX UE may calculate or estimate/obtain a value of SL pathloss based on difference between the RS_PW_REF value and the L3 filtered or L3 averaged RSRP value (reported from the RX UE). For example, finally, the TX UE may calculate or estimate/obtain a value of SL pathloss based on Equation <NUM>.

In the various embodiments described above, for example, the RS_PW_REF value may be an average value of values of transmit power used by the TX UE to transmit one or more RSs within a pre-configured (previous) time window. For example, the RS_PW_REF value may be a weighted average value of values of transmit power used by the TX UE to transmit one or more RSs within a pre-configured (previous) time window. For example, the RS_PW_REF value may be a maximum value among values of transmit power used by the TX UE to transmit one or more RSs within a pre-configured (previous) time window. For example, the RS_PW_REF value may be a minimum value among values of transmit power used by the TX UE to transmit one or more RSs within a pre-configured (previous) time window.

For example, the RS_PW_REF value may be an average value of values of transmit power used by the TX UE to transmit one or more RSs within a pre-configured time window, before a time when the TX UE receives (L3 or L1) RSRP value(s) from the RX UE. For example, the RS_PW_REF value may be a weighted average value of values of transmit power used by the TX UE to transmit one or more RSs within a pre-configured time window, before a time when the TX UE receives (L3 or L1) RSRP value(s) from the RX UE. For example, the RS_PW_REF value may be a maximum value among values of transmit power used by the TX UE to transmit one or more RSs within a pre-configured time window, before a time when the TX UE receives (L3 or L1) RSRP value(s) from the RX UE. For example, the RS_PW_REF value may be a minimum value among values of transmit power used by the TX UE to transmit one or more RSs within a pre-configured time window, before a time when the TX UE receives (L3 or L1) RSRP value(s) from the RX UE.

For example, the RS_PW_REF value may be an average value of values of transmit power used by the TX UE to transmit one or more RSs within a pre-configured time window, before a pre-configured offset value from a time when the TX UE receives (L3 or L1) RSRP value(s) from the RX UE. For example, the RS_PW_REF value may be a weighted average value of values of transmit power used by the TX UE to transmit one or more RSs within a pre-configured time window, before a pre-configured offset value from a time when the TX UE receives (L3 or L1) RSRP value(s) from the RX UE. For example, the RS_PW_REF value may be a maximum value among values of transmit power used by the TX UE to transmit one or more RSs within a pre-configured time window, before a pre-configured offset value from a time when the TX UE receives (L3 or L1) RSRP value(s) from the RX UE. For example, the RS_PW_REF value may be a minimum value among values of transmit power used by the TX UE to transmit one or more RSs within a pre-configured time window, before a pre-configured offset value from a time when the TX UE receives (L3 or L1) RSRP value(s) from the RX UE.

In the various embodiments described above, for example, the RS_PW_REF value may be an average value of values of transmit power used by the TX UE (previously) for the pre-configured number of RS transmissions and/or transmitting the pre-configured number of RSs. For example, the RS_PW_REF value may be a weighted average value of values of transmit power used by the TX UE (previously) for the pre-configured number of RS transmissions and/or transmitting the pre-configured number of RSs. For example, the RS_PW_REF value may be a maximum value among values of transmit power used by the TX UE (previously) for the pre-configured number of RS transmissions and/or transmitting the pre-configured number of RSs. For example, the RS_PW_REF value may be a minimum value among values of transmit power used by the TX UE (previously) for the pre-configured number of RS transmissions and/or transmitting the pre-configured number of RSs.

For example, the RS_PW_REF value may be an average value of values of transmit power used by the TX UE for the pre-configured number of RS transmissions and/or transmitting the pre-configured number of RSs, at the closest time before a time when the TX UE receives (L3 or L1) RSRP value(s) from the RX UE. For example, the RS_PW_REF value may be a weighted average value of values of transmit power used by the TX UE for the pre-configured number of RS transmissions and/or transmitting the pre-configured number of RSs, at the closest time before a time when the TX UE receives (L3 or L1) RSRP value(s) from the RX UE. For example, the RS_PW_REF value may be a maximum value among values of transmit power used by the TX UE for the pre-configured number of RS transmissions and/or transmitting the pre-configured number of RSs, at the closest time before a time when the TX UE receives (L3 or L1) RSRP value(s) from the RX UE. For example, the RS_PW_REF value may be a minimum value among values of transmit power used by the TX UE for the pre-configured number of RS transmissions and/or transmitting the pre-configured number of RSs, at the closest time before a time when the TX UE receives (L3 or L1) RSRP value(s) from the RX UE. For example, the pre-configured number of RS transmission and/or the pre-configured number of RSs may be <NUM>.

For example, the RS_PW_REF value may be an average value of values of transmit power used by the TX UE for the pre-configured number of RS transmissions and/or transmitting the pre-configured number of RSs, at the closest time before a pre-configured offset value from a time when the TX UE receives (L3 or L1) RSRP value(s) from the RX UE. For example, the RS_PW_REF value may be a weighted average value of values of transmit power used by the TX UE for the pre-configured number of RS transmissions and/or transmitting the pre-configured number of RSs, at the closest time before a pre-configured offset value from a time when the TX UE receives (L3 or L1) RSRP value(s) from the RX UE. For example, the RS_PW_REF value may be a maximum value among values of transmit power used by the TX UE for the pre-configured number of RS transmissions and/or transmitting the pre-configured number of RSs, at the closest time before a pre-configured offset value from a time when the TX UE receives (L3 or L1) RSRP value(s) from the RX UE. For example, the RS_PW_REF value may be a minimum value among values of transmit power used by the TX UE for the pre-configured number of RS transmissions and/or transmitting the pre-configured number of RSs, at the closest time before a pre-configured offset value from a time when the TX UE receives (L3 or L1) RSRP value(s) from the RX UE.

In case the TX UE calculates or derives/obtains the RS_PW_REF value, e.g., in case the TX UE calculates or derives/obtains an (weight) average value of transmit power values of a plurality of RSs, the TX UE is configured to use or apply a coefficient (equally) which is used by the RX UE for L3 filtering or L3 averaging. For example, the coefficient may be a coefficient used by the RX UE to calculate or derive/obtain L3 filtered RSRP or L3 averaged RSRP. For example, if the RX UE calculates or derives/obtains L3 filtered RSRP or L3 averaged RSRP based on Equation <NUM>, the TX UE may calculate or derive/obtain an (weight) average value of transmit power values of a plurality of RSs by using the same coefficient (e.g., a).

For example, in case the TX UE calculates or derives/obtains the RS_PW_REF value, e.g., in case the TX UE calculates or derives/obtains an (weight) average value of transmit power values of a plurality of RSs, the TX UE may be configured to use or apply time window information (equally) which is used by the RX UE for L3 filtering or L3 averaging. For example, in case the TX UE calculates or derives/obtains the RS_PW_REF value, the TX UE may be configured to use or apply information regarding the number of samples (e.g., RS transmit power value(s) to which (weight) averaging is applied) (equally) which is used by the RX UE for L3 filtering or L3 averaging. For example, the information regarding the number of samples may be information regarding the maximum number of samples or information regarding the minimum number of samples.

For example, in case the TX UE calculates or derives/obtains the RS_PW_REF value, the TX UE may be configured to calculate or derive/obtain the RS_PW_REF value by using a coefficient pre-configured (independently or newly) for L3 filtering or L3 averaging. For example, in case the TX UE calculates or derives/obtains the RS_PW_REF value, the TX UE may be configured to calculate or derive/obtain the RS_PW_REF value by using time window information pre-configured (independently or newly) for L3 filtering or L3 averaging. For example, in case the TX UE calculates or derives/obtains the RS_PW_REF value, the TX UE may be configured to calculate or derive/obtain the RS_PW_REF value by using information regarding the number of samples pre-configured (independently or newly) for L3 filtering or L3 averaging. For example, the information regarding the number of samples may be information regarding the maximum number of samples or information regarding the minimum number of samples.

For example, the coefficient related to L3 filtering or L3 averaging may be configured for UE(s), independently or differently, based on at least one of a type of a service, a priority of a service, requirement related to a service, QoS related to a service, cast type, and/or congestion level. For example, the time window for L3 filtering or L3 averaging may be configured for UE(s), independently or differently, based on at least one of a type of a service, a priority of a service, requirement related to a service, QoS related to a service, cast type, and/or congestion level. For example, the number of samples to which L3 filtering or L3 averaging is applied (e.g., the minimum number of samples or the maximum number of samples) may be configured for UE(s), independently or differently, based on at least one of a type of a service, a priority of a service, requirement related to a service, QoS related to a service, cast type, and/or congestion level.

For example, in case the TX UE calculates or determines the RS_PW_REF value by using a coefficient or information pre-configured (independently or newly), a length of (averaging) time window used by the TX UE for (weight) averaging of RS transmit power may be configured for the TX UE to a relatively smaller value than a length of time window used by the RX UE for L3 filtering or L3 averaging. For example, in case the TX UE calculates or determines the RS_PW_REF value by using a coefficient or information pre-configured (independently or newly), a length of (averaging) time window used by the TX UE for (weight) averaging of RS transmit power may be configured for the TX UE to a relatively larger value than a length of time window used by the RX UE for L3 filtering or L3 averaging.

For example, in case the TX UE calculates or determines the RS_PW_REF value by using a coefficient or information pre-configured (independently or newly), the number of samples used by the TX UE for (weight) averaging of RS transmit power may be configured for the TX UE to a relatively smaller value than the number of samples used by the RX UE for L3 filtering or L3 averaging. For example, in case the TX UE calculates or determines the RS_PW_REF value by using a coefficient or information pre-configured (independently or newly), the number of samples used by the TX UE for (weight) averaging of RS transmit power may be configured for the TX UE to a relatively larger value than the number of samples used by the RX UE for L3 filtering or L3 averaging. For example, the number of samples may be the maximum number of samples. For example, the number of samples may be the minimum number of samples.

For example, in case the TX UE calculates or determines the RS_PW_REF value by using a coefficient or information pre-configured (independently or newly), a (averaging) coefficient used by the TX UE for (weight) averaging of RS transmit power may be configured for the TX UE to a relatively smaller value than a (averaging) coefficient used by the RX UE for L3 filtering or L3 averaging. For example, in case the TX UE calculates or determines the RS_PW_REF value by using a coefficient or information pre-configured (independently or newly), a (averaging) coefficient used by the TX UE for (weight) averaging of RS transmit power may be configured for the TX UE to a relatively larger value than a (averaging) coefficient used by the RX UE for L3 filtering or L3 averaging.

For example, in case the TX UE calculates or derives/obtains the RS_PW_REF value (described above), the TX UE may consider or use transmit power value(s) of RS(s) included in a pre-configured time window, before a time when the TX UE receives (L3 or L1) RSRP value(s) from the RX UE. For example, the TX UE may calculate or determine the RS_PW_REF value based on transmit power value(s) of RS(s) included in a pre-configured time window, before a time when the TX UE receives (L3 or L1) RSRP value(s) from the RX UE.

For example, in case the TX UE calculates or derives/obtains the RS_PW_REF value (described above), the TX UE may consider or use transmit power value(s) of RS(s) included in a pre-configured time window, before a pre-configured offset value from a time when the TX UE receives (L3 or L1) RSRP value(s) from the RX UE. For example, the TX UE may calculate or determine the RS_PW_REF value based on transmit power value(s) of RS(s) included in a pre-configured time window, before a pre-configured offset value from a time when the TX UE receives (L3 or L1) RSRP value(s) from the RX UE.

For example, in case the TX UE calculates or derives/obtains the RS_PW_REF value (described above), the TX UE may consider or use transmit power value(s) of the pre-configured number of RS transmissions and/or the pre-configured number of RSs, before a time when the TX UE receives (L3 or L1) RSRP value(s) from the RX UE. For example, the TX UE may calculate or determine the RS_PW_REF value based on transmit power value(s) of the pre-configured number of RS transmissions and/or the pre-configured number of RSs, before a time when the TX UE receives (L3 or L1) RSRP value(s) from the RX UE.

For example, in case the TX UE calculates or derives/obtains the RS_PW_REF value (described above), the TX UE may consider or use transmit power value(s) of the pre-configured number of RS transmissions and/or the pre-configured number of RSs, before a pre-configured offset value from a time when the TX UE receives (L3 or L1) RSRP value(s) from the RX UE. For example, the TX UE may calculate or determine the RS_PW_REF value based on transmit power value(s) of the pre-configured number of RS transmissions and/or the pre-configured number of RSs, before a pre-configured offset value from a time when the TX UE receives (L3 or L1) RSRP value(s) from the RX UE.

For example, in the second case and/or in the third case, the TX UE may already know at least one of a coefficient related to L3 filtering or L3 averaging used by the RX UE, information regarding a time window for which the RX UE performs L3 filtering or L3 averaging, and/or information regarding the number of samples (e.g., RS) used by the RX UE for L3 filtering or L3 averaging. For example, the information regarding the time window may include at least one of a length of the time window, a start time of the time window, and/or an end time of the time window. For example, the information regarding the number of samples may include the maximum number of samples and/or the minimum number of samples. For example, the TX UE may receive at least one of a coefficient related to L3 filtering or L3 averaging used by the RX UE, information regarding a time window for which the RX UE performs L3 filtering or L3 averaging, and/or information regarding the number of samples (e.g., RS) used by the RX UE for L3 filtering or L3 averaging, through pre-defined signaling. For example, the pre-defined signaling may be PC5 RRC signaling between the TX UE and the RX UE. For example, the pre-defined signaling may be (pre-)configuration(s) (e.g., SIB, RRC signaling) which is transmitted by the network to the TX UE.

For example, in the second case and/or in the third case, a coefficient related to L3 filtering or L3 averaging used by the RX UE and the TX UE, a length of a time window for which the RX UE and the TX UE perform L3 filtering or L3 averaging, a start time of a time window for which the RX UE and the TX UE perform L3 filtering or L3 averaging, an end time of a time window for which the RX UE and the TX UE perform L3 filtering or L3 averaging, and/or the number of samples used by the RX UE and the TX UE for L3 filtering or L3 averaging may be the same. For example, the number of samples may be the maximum number of samples and/or the minimum number of samples.

For example, a coefficient related to L3 filtering or L3 averaging may be configured for UE(s) per a carrier or per a (resource) pool. For example, a time window (e.g., a length of a time window, a start time of a time window, and/or an end time of a time window) for performing L3 filtering or L3 averaging may be configured for UE(s) per a carrier or per a (resource) pool. For example, a coefficient related to L3 filtering or L3 averaging may be configured for UE(s) per a carrier or per a (resource) pool. For example, the number of samples to which L3 filtering or L3 averaging is applied (e.g., the maximum number of samples and/or the minimum number of samples) may be configured for UE(s) per a carrier or per a (resource) pool.

In step S <NUM>, the TX UE determines transmit power based on the pathloss. In addition, the TX UE may perform SL transmission by using the value of transmit power.

Meanwhile, the TX UE may not be able to efficiently or normally determine transmit power based on SL pathloss. Therefore, if the TX UE is not able to efficiently or normally determine transmit power based on SL pathloss, a method for handling this may be required.

For example, only after the TX UE receives value(s) of RSRP from the RX UE, the TX UE may be configured to change or update the RS_PW_REF value. For example, only after the TX UE receives value(s) of (L3 or L1) RSRP a pre-configured number of times (e.g., <NUM>) from the RX UE, the TX UE may change or update the RS_PW_REF value. For example, only after the TX UE receives value(s) of (L3 or L1) RSRP from the RX UE within a pre-configured time window, the TX UE may change or update the RS_PW_REF value.

For example, only after the TX UE receives value(s) of RSRP from the RX UE, the TX UE may be configured to change or update a value of transmit power of RS(s). For example, only after the TX UE receives value(s) of (L3 or L1) RSRP a pre-configured number of times (e.g., <NUM>) from the RX UE, the TX UE may change or update a value of (actual) transmit power of RS(s) (on reserved/selected resource(s)). For example, only after the TX UE receives value(s) of (L3 or L1) RSRP from the RX UE within a pre-configured time window, the TX UE may change or update a value of (actual) transmit power of RS(s) (on reserved/selected resource(s)).

For example, only after a timer pre-configured for the TX UE expires, the TX UE may be configured to change or update the RS_PW_REF value. For example, only after a timer pre-configured for the TX UE expires, the TX UE may change or update the RS_PW_REF value.

For example, only after a timer pre-configured for the TX UE expires, the TX UE may be configured to change or update a value of transmit power of RS(s). For example, only after the timer pre-configured for the TX UE expires, the TX UE may change or update a value of (actual) transmit power of RS(s) (on reserved/selected resource(s)).

For example, only after passing a time window, the TX UE may be configured to change or update the RS_PW_REF value. For example, only after passing a time window, the TX UE may change or update the RS_PW_REF value.

For example, only after passing a time window, the TX UE may be configured to change or update a value of transmit power of RS(s). For example, only after passing a time window, the TX UE may change or update a value of (actual) transmit power of RS(s) (on reserved/selected resource(s)).

For example, if at least one of the conditions below is satisfied, the TX UE may fall back to a pre-defined transmit power determination method. For example, if at least one of the conditions below is satisfied, the TX UE may determine transmit power based on a pre-defined transmit power determination method, and the TX UE may perform SL transmission based on the transmit power.

For example, the pre-defined transmit power determination method may include: a method in which the TX UE performs SL transmission with the maximum transmit power value of the TX UE. For example, the pre-defined transmit power determination method may include: a method in which the TX UE determines transmit power based on a transmit power determination formula related to a pre-configured communication type (e.g., broadcast), and performs SL transmission with the determined transmit power value. For example, the pre-defined transmit power determination method may include: a method in which the TX UE determines transmit power based on parameters such as parameters related to open-loop power control (OLPC) (e.g., Po, alpha value) (excluding SL pathloss), the number of (scheduled) RBs, etc., and performs SL transmission with the determined transmit power value. For example, the pre-defined transmit power determination method may include: a method in which the TX UE determines transmit power based on SL pathloss after the TX UE estimates/obtains the SL pathloss based on RS(s) transmitted by the RX UE, and performs SL transmission with the determined transmit power value. In this case, it is assumed that the TX UE already knows a value of transmit power of RS(s) transmitted by the RX UE. For example, the TX UE may receive information related to the value of transmit power of the RS(s) transmitted by the RX UE through pre-defined signaling.

Based on various embodiments of the present disclosure, the TX UE may efficiently determine SL transmit power based on a pathloss value between the TX UE and the RX UE. Furthermore, if the TX UE cannot determine SL transmit power based on a pathloss value, the TX UE may efficiently determine SL transmit power based on other scheme(s).

<FIG> shows a method for a first device to determine transmit power, based on an embodiment of the present disclosure.

Referring to <FIG>, in step S1310, a first device may determine/calculate/obtain a value of SL transmit power. For example, the value of SL transmit power may be determined/calculated/obtained based on SL pathloss between the first device and a second device. For example, the first device may determine/calculate/obtain the value of SL transmit power based on various embodiments of the present disclosure.

In step S1320, the first device may perform SL transmission based on the value of SL transmit power.

Additionally, the first device may perform synchronization with a synchronization source, and the first device may perform the above-described operation based on the synchronization. Additionally, the first device may configure one or more BWPs, and the first device may perform the above-described operation based on the one or more BWPs.

The proposed method can be applied to device(s) described below. First, the processor (<NUM>) of the first device (<NUM>) may determine/calculate/obtain a value of SL transmit power. In addition, the processor (<NUM>) of the first device (<NUM>) may control the transceiver (<NUM>) to perform SL transmission based on the value of SL transmit power.

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

Referring to <FIG>, in step S <NUM>, a first device may transmit, to a second device, one or more reference signals (RSs) based on first transmit power.

In step S <NUM>, the first device may receive, from the second device, information related to a channel state measured based on the one or more RSs.

In step S1430, the first device may change the first transmit power to second transmit power based on the information related to the channel state.

In step S <NUM>, the first device may transmit, to the second device, the one or more RSs based on the second transmit power.

For example, the first transmit power may be changed to the second transmit power, based on the first device determining that the information related to the channel state is not valid. For example, the first transmit power may be changed to the second transmit power, based on the first device not receiving the information related to the channel state more than a threshold number of times. For example, the first transmit power may be changed to the second transmit power, based on accuracy of the information related to the channel state which does not satisfy a pre-configured criterion. For example, the first transmit power may be changed to the second transmit power, based on link quality between the first device and the second device which does not satisfy a pre-configured criterion.

For example, the first device may not receive the information related to the channel state measured based on the one or more RSs from the second device. For example, before a unicast session is established between the first device and the second device, the first device may not receive the information related to the channel state from the second device. For example, if the number of RSs transmitted by the first device is smaller than the number of RS s (e.g., the minimum number of RSs) required for the second device to measure the channel state, the second device may not measure the channel state based on RS(s) transmitted by the first device. Accordingly, the first device may not receive the information related to the channel state from the second device. For example, if the first device does not receive the information related to the channel state measured based on the one or more RSs from the second device, the first transmit power may be changed to the second transmit power.

For example, the second transmit power may be a maximum transmit power of the first device. For example, the second transmit power may be determined based on at least one of a parameter related to open loop power control (OLPC) or a number of resource blocks (RBs) allocated to the first device, and pathloss between the first device and the second device may be not used for determining the second transmit power.

Additionally, for example, the first device may obtain pathloss between the first device and the second device based on one or more RSs transmitted by the second device. In this case, the second transmit power may be determined based on the pathloss.

For example, the first transmit power may be a maximum transmit power of the first device. In this case, additionally, the first device may obtain pathloss between the first device and the second device based on the first transmit power and the information related to the channel state. In this case, for example, the first transmit power may be changed to the second transmit power based on the pathloss.

For example, the first transmit power may be time-varying. In this case, additionally, the first device may determine reference transmit power of the first transmit power. For example, a layer-<NUM> (L3) filter coefficient value used by the first device to determine the reference transmit power may be the same as a L3 filter coefficient value used by the second device to obtain the information related to the channel state. Additionally, the first device may obtain pathloss between the first device and the second device based on the reference transmit power and the information related to the channel state. In this case, for example, the first transmit power may be changed to the second transmit power based on the pathloss.

The proposed method can be applied to device(s) described below. First, the processor (<NUM>) of the first device (<NUM>) may control the transceiver (<NUM>) to transmit, to a second device, one or more reference signals (RSs) based on first transmit power. In addition, the processor (<NUM>) of the first device (<NUM>) may control the transceiver (<NUM>) to receive, from the second device, information related to a channel state measured based on the one or more RSs. In addition, the processor (<NUM>) of the first device (<NUM>) may change the first transmit power to second transmit power based on the information related to the channel state. In addition, the processor (<NUM>) of the first device (<NUM>) may control the transceiver (<NUM>) to transmit, to the second device, the one or more RSs based on the second transmit power.

Based on an embodiment of the present disclosure, a first device configured to perform wireless communication may be provided. For example, the first device may comprise: one or more memories storing instructions; one or more transceivers; and one or more processors connected to the one or more memories and the one or more transceivers. For example, the one or more processors may execute the instructions to: transmit, to a second device, one or more reference signals (RSs) based on first transmit power; receive, from the second device, information related to a channel state measured based on the one or more RSs; change the first transmit power to second transmit power based on the information related to the channel state; and transmit, to the second device, the one or more RSs based on the second transmit power.

Based on an embodiment of the present disclosure, an apparatus configured to control a first user equipment (UE) may be provided. For example, the apparatus may comprise: one or more processors; and one or more memories operably connected to the one or more processors and storing instructions. For example, the one or more processors may execute the instructions to: transmit, to a second UE, one or more reference signals (RSs) based on first transmit power; receive, from the second UE, information related to a channel state measured based on the one or more RSs; change the first transmit power to second transmit power based on the information related to the channel state; and transmit, to the second UE, the one or more RSs based on the second transmit power.

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: transmit, to a second device, one or more reference signals (RSs) based on first transmit power; receive, from the second device, information related to a channel state measured based on the one or more RSs; change the first transmit power to second transmit power based on the information related to the channel state; and transmit, to the second device, the one or more RSs based on the second transmit power.

Referring to <FIG>, in step S1510, a first device may transmit, to a second device, a reference signal (RS) based on first transmit power.

In step S <NUM>, the first device may transmit, to the second device, the RS based on second transmission power.

In step S <NUM>, the first device may determine reference transmit power based on the first transmit power and the second transmit power. For example, the reference transmit power may be determined based on a layer-<NUM> (L3) filter coefficient value.

For example, the L3 filter coefficient value used by the first device to determine the reference transmit power may be the same as a L3 filter coefficient value used by the second device to obtain information related to a channel state based on the RS.

The proposed method can be applied to device(s) described below. First, the processor (<NUM>) of the first device (<NUM>) may control the transceiver (<NUM>) to transmit, to a second device, a reference signal (RS) based on first transmit power. In addition, the processor (<NUM>) of the first device (<NUM>) may control the transceiver (<NUM>) to transmit, to the second device, the RS based on second transmission power. In addition, the processor (<NUM>) of the first device (<NUM>) may determine reference transmit power based on the first transmit power and the second transmit power.

Based on an embodiment of the present disclosure, a first device configured to perform wireless communication may be provided. For example, the first device may comprise: one or more memories storing instructions; one or more transceivers; and one or more processors connected to the one or more memories and the one or more transceivers. For example, the one or more processors may execute the instructions to: transmit, to a second device, a reference signal (RS) based on first transmit power; transmit, to the second device, the RS based on second transmission power; and determine reference transmit power based on the first transmit power and the second transmit power. For example, the reference transmit power may be determined based on a layer-<NUM> (L3) filter coefficient value.

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

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

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

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

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

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

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

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

For example, the communication unit <NUM> may receive map data, traffic information data, etc. from an external server. The autonomous driving unit 140d may generate an autonomous driving path and a driving plan from the obtained data. The control unit <NUM> may control the driving unit 140a such that the vehicle or the autonomous vehicle <NUM> may move along the autonomous driving path according to the driving plan (e.g., speed/direction control). In the middle of autonomous driving, the communication unit <NUM> may aperiodically/periodically acquire recent traffic information data from the external server and acquire surrounding traffic information data from neighboring vehicles. In the middle of autonomous driving, the sensor unit 140c may obtain a vehicle state and/or surrounding environment information. The autonomous driving unit 140d may update the autonomous driving path and the driving plan based on the newly obtained data/information. The communication unit <NUM> may transfer information about a vehicle position, the autonomous driving path, and/or the driving plan to the external server. The external server may predict traffic information data using AI technology, etc., based on the information collected from vehicles or autonomous vehicles and provide the predicted traffic information data to the vehicles or the autonomous vehicles.

Claim 1:
A method for performing wireless communication by a first device (<NUM>), the method comprising:
transmitting sidelink control information, SCI, to a second device (<NUM>) through a physical sidelink control channel, PSCCH;
transmitting, to the second device (<NUM>), a physical sidelink shared channel, PSSCH;
obtaining a reference signal power value for obtaining a sidelink, SL, pathloss from transmit power values for transmitting the PSSCH layer <NUM>, L3, filtered using L3 filter coefficient information of <NUM>-NR;
receiving, from the second device (<NUM>), a reference signal received power, RSRP, value;
obtaining the SL pathloss by subtracting the received RSRP value from the reference signal power value; and
determining first transmit power based on the SL pathloss,
wherein the L3 filter coefficient information used for obtaining the RSRP value and the reference signal power value corresponds to a same filter coefficient value.