User Equipment and Wireless Communication Method

Abstract

A user equipment and a wireless communication method related to power control of sidelink transmissions and any other sidelink operations in NR V2X are provided. The user equipment includes: a receiver that receives indication information for a sidelink transmission power determination basis, the indication information indicating a set of (multiple) downlink reference signals for determining a path loss for power control of a sidelink channel to be transmitted by the user equipment or that the path loss for power control of the sidelink channel is determined based on sidelink reference signals; and circuitry that determines a path loss for power control of the sidelink channel based on the indication information.

Description

Technical Field

[0001] The present disclosure relates to the field of wireless communication, and more particularly, to wireless communication devices such as user equipment and base stations, and wireless communication methods related to determining power control of sidelink channels or any other sidelink operations in a new radio (NR) access technology. Background Art

[0002] In mode 3 (i.e., base station scheduling) in LTE V2X, the power of the physical sidelink shared channel (PSSCH) is based on the path loss from the base station to the user equipment (UE) and other parameters such as P0 and alpha, and the power of the physical sidelink control channel (PSCCH) has a fixed relationship with the power of the PSSCH.

[0003] So far, power control for sidelink transmission in NR V2X is still in a very initial stage, and how to determine the power for sidelink transmission for a user equipment is being discussed. Summary of the Invention

[0004] A non-limiting and exemplary embodiment helps to determine parameters (especially path loss) for power control of sidelink channels to be transmitted by a user equipment in NR to optimize system performance.

[0005] In an embodiment of the present disclosure, the technology disclosed herein includes a user equipment, comprising: a receiver that receives indication information for a basis of power determination for sidelink transmission, the indication information indicating a set of (multiple) downlink reference signals for determining a path loss for power control of a sidelink channel to be transmitted by the user equipment or that the path loss for power control of the sidelink channel is determined based on (multiple) sidelink reference signals; and circuitry that determines a path loss for power control of the sidelink channel based on the indication information.

[0006] In another embodiment of the present disclosure, the technology disclosed herein is a user equipment, comprising: a receiver that receives multiple downlink or sidelink beams; and circuitry that determines a path loss for power control of the sidelink channel based on a set of (multiple) reference signals associated with the best downlink or sidelink beam determined by the user equipment among the multiple downlink or sidelink beams.

[0007] In another embodiment of the present disclosure, the technology disclosed herein is a wireless communication method for a user equipment, including: receiving indication information for a power determination basis for sidelink transmission, the indication information indicating a set of (multiple) downlink reference signals for determining a path loss for power control of a sidelink channel to be transmitted by the user equipment or the path loss for power control of the sidelink channel is determined based on (multiple) sidelink reference signals; and determining a path loss for power control of the sidelink channel based on the indication information.

[0008] In another embodiment of the present disclosure, the technology disclosed herein is a wireless communication method for a user equipment, including: receiving multiple downlink or sidelink beams; and determining a path loss for power control of a sidelink channel based on a set of (multiple) reference signals associated with the best downlink or sidelink beam determined by the user equipment among the multiple downlink or sidelink beams.

[0009] It should be noted that the general or specific embodiments can be implemented as a system, a method, an integrated circuit, a computer program, a storage medium, or any selective combination thereof.

[0010] From the specification and the drawings, additional benefits and advantages of the disclosed embodiments will become apparent. The benefits and / or advantages can be obtained separately by various embodiments and features of the specification and the drawings. To obtain one or more such benefits and / or advantages, it is not necessary to provide all of these embodiments and features. Description of the Drawings

[0011] In conjunction with the drawings, from the following description and the appended claims, the foregoing and other features of the present disclosure will become more fully apparent. It should be understood that these drawings only depict several embodiments according to the present disclosure, and thus these drawings should not be considered as limiting its scope. The present disclosure will be described with additional features and details by using the drawings, where:

[0012] Figure 1 An exemplary scenario of sidelink transmission in NR is schematically shown;

[0013] Figure 2 A block diagram showing details of a user equipment in the case of power control of sidelink transmission according to an embodiment of the present disclosure is shown;

[0014] Figure 3 Options of an exemplary scenario of sidelink transmission of a user equipment according to an embodiment of the present disclosure are schematically shown;

[0015] Figure 4 Another exemplary scenario of sidelink transmission of a user equipment according to an embodiment of the present disclosure is schematically shown;

[0016] Figure 5A A flowchart of a wireless communication method performed by a user equipment according to an embodiment of the present disclosure is shown;

[0017] Figure 5B A flowchart of a wireless communication method performed by a user equipment according to an embodiment of the present disclosure is shown;

[0018] Figure 6 A flowchart of a wireless communication method for a user equipment according to another embodiment of the present disclosure is shown;

[0019] Figure 7A An example of a flowchart of communication between a base station and a user equipment according to an embodiment of the present disclosure is schematically shown;

[0020] Figure 7B An example of a flowchart of communication between a user equipment and another user equipment according to an embodiment of the present disclosure is schematically shown;

[0021] Figure 8 An example of a flowchart of communication between a base station / user equipment and another user equipment according to another embodiment of the present disclosure is schematically shown; and

[0022] Figure 9 An example of a user equipment according to an embodiment of the present disclosure is systematically shown. Detailed Description

[0023] In the following detailed description, reference is made to the accompanying drawings, which form a part of the detailed description. In the drawings, unless the context otherwise requires, like reference symbols generally identify like components. It is readily understood that the aspects of the present disclosure can be arranged, substituted, combined, and designed in a wide variety of different configurations, all of which are expressly contemplated and form a part of the present disclosure.

[0024] In the NR V2X research project of Release 16, two modes of resource allocation for sidelink were discussed. One mode is Mode 1, where sidelink resource allocation is based on gNB scheduling (which is similar to Mode 3 in LTE V2X). For Mode 1, a typical scenario is that the gNB controls the sidelink resource allocation of the transmitting UE (Tx UE), and the transmitting UE should be in the RRC_CONNECTED state. For the receiving UE (Rx UE), it can be in any RRC state (e.g., RRC_CONNECTED, RRC_IDLE, or RRC_INACTIVE). The other mode is Mode 2, where sidelink resource allocation is in principle based on UE autonomous scheduling (which is similar to Mode 4 in LTE V2X). Here, in Mode 2, sub-modes can be included, where the sub-modes can include the UE autonomously selecting the sidelink resources for transmission; the UE assisting in the sidelink resource selection for (multiple) other UEs; the UE being configured with an NR configured grant for sidelink transmission (such as Type 1), which means deactivation / activation based on RRC configuration and sidelink transmission; and the case where the UE schedules the sidelink transmission of (multiple) other UEs.

[0025] In LTE V2X, for sidelink transmission mode 3, the power of the PSSCH is based on the path loss from the eNB to the UE (e.g., "PL" in the following power control formula) and other parameters such as P0 and alpha. In particular, the UE transmit power P PSSCH is given by:

[0026]

[0027] where P CMAX is defined in 3GPP TS 36.101: "Evolved Universal Terrestrial Radio Access (E-UTRA); User Equipment (UE) radio transmission and reception" (e.g., Release 15.5.0), and M PSSCH is the bandwidth of the PSSCH resource assignment in terms of the number of resource blocks, and PL = PL c , where PL c is defined in Subclause 5.1.1.1 of 3GPP TS 36.213 (e.g., Release 15.4.0). P O_PSSCH,3 and α PSSCH,3It is provided by the higher layer parameters p0SL-V2V and alphaSL-V2V respectively, and is associated with the corresponding PSSCH resource configuration.

[0028] The UE transmit power P for PSCCH transmission PSCCH is related to the P for PSSCH transmission PSSCH has a fixed relationship, and the UE transmit power P for PSCCH transmission in sidelink transmission mode 3 in LTE V2X PSCCH is given by:

[0029]

[0030] where P CMAX is defined in 3GPP TS 36.101: "Evolved Universal Terrestrial Radio Access (E-UTRA); User Equipment (UE) radio transmission and reception" (e.g., version 15.5.0), M PSSCH is the bandwidth of the PSSCH resource allocation indicated by the number M PSCCH = 2 of resource blocks, and PL = PL c where PL c is defined in subclause 5.1.1.1 of 3GPP TS 36.101 (e.g., version 15.4.0). P O_PSSCH,3 and α PSSCH,3 It is provided by the higher layer parameters p0SL-V2V and alphaSL-V2V respectively, and is associated with the corresponding PSSCH resource configuration.

[0031] However, for NR sidelink, how to determine power control is still unclear. For example, for downlink, there may be multiple downlink RSs associated with different beams, and it will be studied which downlink RS (or beam) is used for power control determination. In addition, power control based on the sidelink path between the Tx UE and the Rx UE may also be required.

[0032] In view of the above, the present disclosure is provided. However, in addition to V2X, the present disclosure can also be applied to other D2D communications. Additionally, note that although the following embodiments may be described as being in NR sidelink mode 1 or NR sidelink mode 2, they can be applicable to both NR sidelink mode 1 and mode 2 without being specified, or any other suitable mode specified in a further version.

[0033] Figure 1An exemplary scenario of sidelink transmission in NR is schematically shown. As Figure 1 shown, the gNB 200 may transmit a downlink signal to the vehicle 101 via downlink transmission. The downlink signal may be, for example, an RS, control information such as DCI, etc. There may be one or more beams for downlink transmission from the gNB 200 to the vehicle 101, and each beam may have a corresponding downlink RS. In addition, signal transmission may also be sent from the vehicle 101 to another vehicle 102 via sidelink, as indicated by the two opposite arrows called "sidelink transmission". Here, the vehicle 101 may be any user equipment appropriately selected, and the term "vehicle" should not be considered restrictive. In addition, multiple beams from the gNB 200 to the vehicle 101 or between the vehicles 101 and 102 may be supported.

[0034] For example, in one embodiment, the gNB 200 may transmit PDCCH and PDSCH to the vehicle 101 as downlink transmission, and the vehicle 101 transmits PUCCH and PUSCH to the gNB 200. The vehicles 101 and 102 may also transmit PSSCH, PSCCH, and / or PSFCH to each other as sidelink transmission.

[0035] Details of the vehicle 101 may be referred to Figure 2 . Figure 2 A block diagram showing details of the UE 100 (e.g., vehicles 101 and 102) in the case of power control of sidelink transmission according to an embodiment of the present disclosure is shown. In particular, the UE 100 may include a receiver 110 and a circuit 120. The receiver 110 receives indication information for a power determination basis for sidelink transmission, where the indication information indicates a set of downlink RSs for determining the path loss for power control of a sidelink channel to be transmitted by the user equipment, or the indication information indicates that the path loss for power control of the sidelink channel is determined based on sidelink RS. The circuit 120 determines the path loss for power control of the sidelink channel based on the indication information. Here, the set of downlink RSs may include one or more downlink RSs.

[0036] For example, Figure 1The gNB 200 in [the above] can dynamically indicate indication information to the vehicle 101 (e.g., via downlink control information (DCI) or medium access control - control element (MAC - CE)). This indication information can point to a specific downlink RS (i.e., a determination basis) on which the determination of the path loss for power control of a certain sidelink channel is based, or this indication information can also indicate that the path loss for power control of the sidelink channel is determined based on the sidelink RS (i.e., another determination basis). In an embodiment of the present disclosure, the gNB 200 can also semi - dynamically indicate the indication information (e.g., via radio resource control (RRC) information).

[0037] In the case where the indication information indicates that the path loss for power control of the sidelink channel is determined based on the sidelink RS, when there are multiple sidelink RSs associated with different sidelink beams from another UE (e.g., vehicle 102 (i.e., beam scanning) or from multiple UEs (i.e., groupcast)), the vehicle 101 can then decide, based on, for example, the implementation of the vehicle 101, which specific sidelink RS will be used to determine the path loss for power control of the sidelink channel. Here, the "specific downlink RS" and "specific sidelink RS" can be a specific combination of multiple downlink RSs or sidelink RSs.

[0038] Through the configuration of the above - mentioned embodiments, the present invention realizes the advantages of indicating the (multiple) reference signals or power determination basis of the path loss for power control determination of the sidelink channel, and for the case where there is more than one reference signal (or more than one beam), it has the flexibility for the gNB to control the power of the UE based on different purposes.

[0039] In an embodiment, for different resource allocation modes, the power control of the user equipment is performed differently. For example, the power control of the UE in NR mode 1 is performed differently from the power control of the UE in NR mode 2. Through the configuration of the above - mentioned embodiments, the present invention realizes the advantages of optimizing the power control of the UE in different modes.

[0040] In an embodiment, the set of the downlink RSs can include a primary synchronization signal (PSS), a secondary synchronization signal (PSS), and / or a channel state information reference signal (CSI - RS). Note that any other downlink RS can also be selected as appropriate. And in an embodiment, the PSS, SSS, and / or CSI - RS can come from one or more downlink beams.

[0041] In one embodiment, the indication information indicates, via DCI, an index as the basis for power determination for sidelink transmission, and the association between the basis for power determination for sidelink transmission and the index is configured, pre-configured, or specified via RRC information. For example, the indication information may indicate, via DCI, a 2-bit field as the basis for power determination for sidelink transmission, as shown in Table 1 below:

[0042]

[0043]

[0044] Table 1

[0045] Through the configuration of the above embodiments, the present invention realizes the advantages of dynamic power control for different purposes, with less indication information (i.e., only the index) sent from the gNB to the UE via downlink transmission, thus saving downlink transmission resources.

[0046] In the embodiment of Table 1, all or some of the sidelink paths use the same basis for power determination. However, the basis for power determination for sidelink transmission can also be determined individually by the indication information. In one embodiment, the indication information may indicate, via DCI in the form of a 2-bit field per sidelink channel, the basis for power determination for sidelink transmission for each individual sidelink channel. For example, the first two bits of the indication information may indicate the basis for power determination for PSSCH, as shown in Table 1, the second two bits of the indication information may indicate the basis for power determination for PSCCH, and the third two bits of the indication information may indicate the basis for power determination for PSFCH.

[0047] In addition, in cases where the basis for power determination for sidelink transmission can be determined individually, the index is not limited to corresponding to the downlink RS / in cases where the path loss is determined only based on the sidelink RS or the 2-bit interpretation is used for the sidelink channel, but can also correspond to a combination of RS assignments for different sidelink channels. For example, the indication information may indicate, via DCI, a 2-bit field as the basis for power determination for sidelink transmission, as shown in Table 2 below:

[0048]

[0049] Table 2

[0050] In the above example, the mapping between each index and the basis for power determination can be configured via RRC configuration, pre-configured in the user equipment, or specified according to standards or any combination thereof.

[0051] In the example shown in Table 2, the indication information separately indicates the power determination basis for sidelink transmission for the PSCCH and the PSSCH. That is, the (multiple) reference signals for determining the path loss for power control of the PSCCH and the PSSCH may be different (multiple) reference signals or different combinations of (multiple) reference signals. In yet another embodiment, the indication information may indicate the power determination basis for sidelink transmission of the physical sidelink feedback channel (PSFCH) separated from the power determination basis for sidelink transmission of the PSCCH and the PSSCH. Note that even when the indication information indicates power determination for each sidelink channel separately, the indication information may also indicate the same power determination basis for any two or three of the PSCCH, the PSSCH, and the PSFCH.

[0052] Note that the term "2-bit field" mentioned in the embodiments of the present invention should not be regarded as a limitation. Specifically, the indication information may indicate the power determination basis for sidelink transmission by any appropriately selected bit number field. In addition, the indication information may indicate the power determination basis for sidelink transmission of each individual sidelink channel by each N-bit field, and N may also be appropriately selected. Alternatively, the indication information may indicate the power determination basis for the first sidelink channel by the first N1-bit field and the power determination basis for the second sidelink channel by the next N2-bit field, where N1, N2... may be the same or different.

[0053] Through the configuration of the above embodiments, the present invention realizes the advantage of better flexibility in power control on different channels (especially sidelink channels), because different channels may have different power determination bases for each other, and additionally, for the example of Table 2, the use of indexes allows less indication information (i.e., only one index indicating the power determination basis for multiple sidelink channels) to be transmitted from the gNB to the UE via the downlink.

[0054] In yet another embodiment, even when the indication information indicates the same power determination basis (e.g., the same downlink RS) for the PSCCH and the PSSCH, the path loss for power control of the PSCCH and the path loss for power control of the PSSCH are in a fixed relationship. For example, the path loss of the PSCCH = the path loss of the PSSCH + offset. Here, the offset may be a constant and may be configured by the gNB via RRC signaling, pre-configured in the user equipment, or specified according to the standard.

[0055] With the configurations of the above embodiments, the present invention can rely on fewer reference signals for power control of multiple sidelink channels, and at the same time can also reflect the differences in the reference signals for power control between different channels, thereby allowing simpler UE behavior and flexibility in power control for different sidelink channels, and saving signaling overhead.

[0056] Refer to Figure 3 Discuss the applications of the above embodiments. Figure 3 Options for an exemplary scenario of sidelink transmission for a user equipment according to an embodiment of the present disclosure are schematically shown. As Figure 3 shown, options 1A, 1B, and 3 for PSSCH / PSCCH multiplexing all relate to the case where PSCCH and PSSCH are time division multiplexed (TDM). In option 1B, PSCCH and PSSCH are TDM and have different bandwidths. In this case, embodiments of the present invention based on power determination bases can be applied to determine the power control for PSCCH and PSSCH.

[0057] With the above embodiments, for the case of different coverages of different channels, the present invention can flexibly indicate the power determination bases for each channel while saving the transmission resources of the downlink channel.

[0058] For Figure 3 For the case of option 3 shown, embodiments of the present invention based on the same RS can be applied to determine the power control for PSCCH and PSSCH. By embodiments of the present invention based on the same power determination bases to determine the power control for PSCCH and PSSCH, a constant power can be achieved for symbols with or without PSCCH.

[0059] With the configurations of the above embodiments, the present invention can maintain a constant power for symbols with or without PSCCH.

[0060] Refer to Figure 4 Discuss additional applications of the above embodiments. Figure 4Another exemplary scenario of sidelink transmission of a user equipment according to an embodiment of the present disclosure is schematically shown. In particular, in this scenario, two-phase sidelink control information (SCI) is shown, where the SCI in the first phase is used to indicate broadcasting and sensing, and the SCI in the second phase is used to indicate unicast / multicast specific information. In such a scenario, for example, the PSSCH and PSCCH carrying the SCI in the first phase determine power control based on the same power determination basis, while the PSSCH and PSCCH carrying the SCI in the second phase determine power control based on different power determination bases. Alternatively, the PSSCH and PSCCH carrying the SCI in the first and second phases determine power control based on different power determination bases.

[0061] Through the above embodiments, the present invention can achieve different coverage for different sidelink channels, which allows for flexible power control for individual sidelink channels as needed.

[0062] In one embodiment, parameters other than path loss, such as P0 and alpha defined in Equation 1 or 2, can also be used for power control of sidelink channels, which can be configured, pre-configured, or associated with the path loss for power control of sidelink channels. P0 represents the target value of the received SINR, and alpha represents the coefficient of the path loss. For example, P in Equations 1 and 2 O_PSSCH,3 and α PSSCH,3 [[ID=ID=10]]parameters can be configured by the gNB, pre-configured in the UE, or specified according to the standard. That is, P O_PSSCH,3 and α PSSCH,3 parameters are common to all beams or RSs used to determine the path loss. In another example, parameters other than path loss (such as P0 and alpha) for power control of sidelink channels are associated with the power determination basis of the sidelink transmission (such as a specific downlink RS) used to determine the path loss. In this way, once the power determination basis for the sidelink transmission is indicated by, for example, DCI, the combination of path loss, P0, and alpha for power control of the sidelink channel to be transmitted is selected. Note that the same or similar equations as Equation 1 or 2 can be used for power control of sidelink transmission, or different equations with parameters of path loss and optional P0 and alpha can be used.

[0063] Now back to Figure 1 , vehicle 101 can also send indication information to vehicle 102 for indicating the power determination basis of vehicle 102. Specifically referring to Figure, the UE 100 (e.g., the vehicle 102) includes a receiver 110 and a circuit 120, where the receiver 110 receives indication information for the power determination basis of sidelink transmission, and the indication information indicates a set of (multiple) sidelink reference signals for determining the path loss for power control of the sidelink channel to be transmitted by the user equipment; and the circuit 120 determines the path loss for power control of the sidelink channel based on the indication information.

[0064] In one embodiment, the indication information is sent via sidelink control information. In another embodiment, the sidelink channel is a Physical Sidelink Feedback Channel (PSFCH). Through the configuration of the above embodiments, when the transmitting UE sends sidelink data to the receiving UE each time, even when both UEs are in the RRC_IDLE mode, the power control of certain sidelink channels (e.g., PSFCH) of the receiving UE can be determined in a more flexible manner.

[0065] In another embodiment, refer to ​ , for example, the vehicle 101 may not receive indication information about the power determination basis for sidelink transmission from the gNB (e.g., when the UE is in the RRC_IDLE mode). In this case, the vehicle 101 can determine the RS of the path loss by itself. Specifically refer to ​ , in one embodiment, the UE 100 includes a receiver 110 and a circuit 120, where the receiver 110 receives multiple downlink or sidelink beams, and the circuit 120 determines the path loss for power control of the sidelink channel based on a set of (multiple) reference signals associated with the best downlink or sidelink beam determined by the user equipment among the multiple downlink or sidelink beams.

[0066] More specifically, in one embodiment, the receiver 110 of the UE 100 can receive multiple downlink beams from the gNB. Then, the circuit 120 of the UE 100 can determine the path loss for power control of the sidelink channel based on a set of (multiple) reference signals associated with the best downlink beam determined by the UE among the multiple downlink beams.

[0067] In another embodiment, the receiver 110 of the UE 100 can receive multiple sidelink beams from another UE. Then, the circuit 120 of the UE 100 can determine the path loss for power control of the sidelink channel based on a set of (multiple) reference signals associated with the best sidelink beam determined by the UE among the multiple sidelink beams received from another UE.

[0068] With the configuration of the above embodiments, the present invention allows the UE to implement power determination basis selection without receiving indication information from the gNB, and can also implement optimization based on the actual information on the beam. In addition, when the UE is in the RRC_IDLE mode, the UE can autonomously determine the power determination basis.

[0069] In one embodiment, the best downlink beam is the best beam for receiving the Synchronization Signal Block (SSB) measured by the user equipment in a specific time window; or the best sidelink beam is the best beam according to beam management between the UE (e.g., vehicle 101) and another UE (e.g., vehicle 102) communicating with the UE 100. Here, the specific time window can be configured by the gNB, pre-configured in the UE, or specified according to the standard.

[0070] Note that the "indication information" in the present disclosure is not necessarily the latest indication information sent from the gNB or another UE. For example, in the case where the UE does not properly receive the indication information for subsequent sidelink transmissions, the UE can use, for example, the indication information received from the last transmission of, for example, DCI from the gNB. Also note that the default power determination basis can be in various forms (e.g., downlink RS or RRC configuration associated with the best beam), and is not limited to the above examples.

[0071] ​ A flowchart of a wireless communication method performed by a user equipment according to an embodiment of the present disclosure is shown.

[0072] As ​ shown, the wireless communication method performed by the user equipment starts at step S1001: receiving indication information for a power determination basis for sidelink transmission, the indication information indicating a set of (multiple) downlink reference signals for determining the path loss for power control of a sidelink channel to be transmitted by the user equipment or that the path loss for power control of the sidelink channel is determined based on (multiple) sidelink reference signals.

[0073] Then, at step S1002, the UE determines the path loss for power control of the sidelink channel based on the indication information. Here, the UE can be the UE 100 as ​ shown or the vehicle 101 as ​ shown. Similar advantages associated with the above embodiments of the UE 100 or the vehicle 101 can also be achieved, with details omitted.

[0074] In one embodiment, a UE may receive indication information (e.g., via downlink control information (DCI) or a media access control control element (MAC-CE)). The indication information may point to a specific downlink RS (i.e., a determination basis) on which the determination of the path loss for power control of a certain sidelink channel is based, or the indication information may further indicate that the path loss for power control of the sidelink channel is determined based on a sidelink RS (i.e., another determination basis). In one embodiment of the present disclosure, the indication information may be sent to the UE via radio resource control (RRC) information.

[0075] In the case where the indication information indicates that the path loss for power control of the sidelink channel is determined based on a sidelink RS, when there are multiple sidelink RSs associated with different sidelink beams from another UE (i.e., beam scanning) or from multiple UEs (i.e., multicast), the UE may then decide, based on, for example, the implementation manner of the UE, which specific sidelink RS will be used to determine the path loss for power control of the sidelink channel. Here, the "specific downlink RS" and the "specific sidelink RS" may be a specific combination of multiple downlink RSs or sidelink RSs.

[0076] ​ A flowchart of a wireless communication method performed by a user equipment according to an embodiment of the present disclosure is shown.

[0077] As ​ shown, the wireless communication method performed by the user equipment begins at step S1101: receiving indication information for a power determination basis for sidelink transmission, the indication information indicating a set of (multiple) downlink reference signals for determining a path loss for power control of a sidelink channel to be transmitted by the user equipment.

[0078] Then, at step S1102, the UE determines the path loss for power control of the sidelink channel based on the indication information. Here, the UE may be the UE 100 as ​ shown or the vehicle 102 as ​ shown. Similar advantages associated with the above embodiments of the UE 100 or the vehicle 102 may also be achieved, with details omitted.

[0079] In one embodiment, a UE may receive indication information (e.g., via SCI). The indication information may point to a specific downlink RS (i.e., a determination basis) on which the determination of the path loss for power control of a certain sidelink channel is based. In one embodiment of the present disclosure, the sidelink channel for which power control is performed is the PSFCH.

[0080] In one embodiment, when there are multiple sidelink reference signals (RSs) associated with different sidelink beams from another UE (i.e., beam scanning) or from multiple UEs (i.e., multicast), the UE can then decide, based on, for example, the implementation of the UE, which specific sidelink RS will be used to determine the path loss for power control of the sidelink channel. The "specific sidelink RS" here can be a specific combination of multiple sidelink RSs.

[0081] ​ FIG. 4 shows a flowchart of a wireless communication method 2000 of a user equipment according to another embodiment of the present disclosure.

[0082] As ​ shown, the wireless communication method performed by the UE begins at step ST2001: receiving multiple downlink or sidelink beams. Here, each downlink or sidelink beam can be associated with a set of downlink reference signals (RSs) or a set of sidelink RSs. Here, the user equipment can be the UE 100 as ​ shown or the vehicle 101 as ​ shown. Similar advantages associated with the above embodiments of the UE 100 or the vehicle 101 can also be achieved, and details are omitted.

[0083] Then, at step S2002, the UE determines the path loss for power control of the sidelink channel based on the set of RSs associated with the best downlink or sidelink beam determined by the UE among the multiple downlink or sidelink beams.

[0084] In one embodiment, if the path loss for power control of the sidelink channel is determined based on the best downlink beam (e.g., in mode 1), the best downlink beam is the best beam for receiving the synchronization signal block (SSB) measured by the UE in a specific time window; if the power for power control of the sidelink channel is determined based on the best sidelink beam (e.g., in mode 2), the best sidelink beam is the best beam according to beam management between the UE and another UE communicating with the UE.

[0085] In one embodiment, if there is no beam management for the case of determining the path loss for power control of the sidelink channel based on the best sidelink, which reported reference signal received power received from another UE will be used for the path loss is based on the implementation of the UE.

[0086] ​FIG. 0 schematically shows an example of a flowchart of communication between a base station and a user equipment according to an embodiment of the present disclosure. In particular, an example of a flowchart of a communication method between a gNB 700 and a UE 710 according to an embodiment of the present disclosure is shown. The UE 710 may be, for example, the UE 100 as shown in ​ or the vehicle 101 as shown in ​ , and the gNB 700 may be, for example, the gNB 200 as shown in ​ . Similar advantages associated with the above embodiments of the UE 100 or the vehicle 101 can also be achieved, and details are omitted.

[0087] As shown in ​ , at step ST 1101, the gNB 700 may send indication information for a power determination basis for sidelink transmission to the UE 710, where the indication information indicates a set of (a plurality of) downlink reference signals for determining a path loss for power control of a sidelink channel to be transmitted by the user equipment, or determines a path loss for power control of the sidelink channel based on (a plurality of) sidelink reference signals. In response, the UE 710 may receive the indication information from the gNB 700. Here, the set of downlink RSs may include one or more downlink RSs. The UE 710 may be the UE 100 as shown in ​ or the vehicle 101 as shown in ​ .

[0088] Once the UE 710 receives the indication information from the gNB 700, at step ST 1102, the UE 710 may determine a path loss for power control of the sidelink channel based on the indication information. Specifically, the UE 710 may determine a path loss for power control of the sidelink channel based on a specific set of downlink RSs indicated by the indication information or a sidelink RS further determined by a specific set of sidelink RSs to be used.

[0089] For example, ​ the gNB 700 in

[0090] In a case where the indication information indicates that the path loss for power control of the sidelink channel is determined based on the sidelink RS, when there are multiple sidelink RSs associated with different sidelink beams from another UE (e.g., vehicle 102) (i.e., beam scanning) or from multiple UEs (i.e., multicast), the UE 700 can then decide, based on, for example, the implementation of the UE 700, which specific sidelink RS will be used to determine the path loss for power control of the sidelink channel. Here, the "specific downlink RS" and "specific sidelink RS" can be a specific combination of multiple downlink RSs or sidelink RSs.

[0091] As ​ shown, at step ST 1111, the UE 710 can send indication information for the basis of power determination for sidelink transmission to the UE 720, and the indication information indicates a set of (multiple) downlink reference signals for determining the path loss for power control of the sidelink channel to be transmitted by the user equipment. In response, the UE 720 can receive the indication information from the UE 710. Here, the set of downlink RSs can include one or more downlink RSs. The UE 720 can be the UE 100 as ​ shown or the vehicle 102 as ​ shown.

[0092] Once the UE 720 receives the indication information from the UE 710, then at step ST 1112, the UE 720 can determine the path loss for power control of the sidelink channel based on the indication information. Specifically, the UE 720 can determine the path loss for power control of the sidelink channel based on the specific set of sidelink RSs indicated by the indication information.

[0093] For example, ​ the UE 710 in

[0094]

[0095] ​ can dynamically indicate the indication information to the UE 720 (e.g., via SCI). The indication information can point to the specific downlink RS based on which the path loss for power control of a certain sidelink channel is determined. In one embodiment of the present disclosure, the sidelink channel for which power control is performed is the PSFCH.

[0094] In one embodiment, when there are multiple sidelink RSs associated with different sidelink beams from another UE (i.e., beam scanning) or from multiple UEs (i.e., multicast), the UE can then decide, based on, for example, the implementation of the UE, which specific sidelink RS to use to determine the path loss for power control of the sidelink channel. The "specific sidelink RS" here can be a specific combination of multiple sidelink RSs.

[0095] ​FIG. 0 schematically shows an example of a flowchart of communication between a base station / user equipment and another user equipment according to another embodiment of the present disclosure. In particular, an example of a flowchart of a communication method between gNB 800 and UE 810 according to an embodiment of the present disclosure is shown. Alternatively, ​ the example shown can also be applied to communication between UE 810 and another UE 820. UE 810 can be, for example, UE 100 as shown in ​ FIG. or vehicle 101 as shown in ​ FIG., gNB 800 can be, for example, gNB 200 as shown in ​ FIG., and UE 820 can be vehicle 102 as shown in ​ FIG. Similar advantages associated with the above embodiments of UE100 or vehicle 101 can also be achieved, and details are omitted.

[0096] As shown in ​ FIG., gNB 800 / UE 820 sends multiple downlink or sidelink beams to UE 810. In response, UE 810 receives multiple downlink beams from gNB 800 or multiple sidelink beams from another UE 820. Here, each downlink or sidelink beam can be associated with a set of downlink RSs or a set of sidelink RSs.

[0097] After receiving multiple downlink or sidelink beams, UE 810 determines a path loss for power control of the sidelink channel based on a set of (multiple) reference signals associated with the best downlink or sidelink beam determined by UE 810 among the multiple downlink or sidelink beams.

[0098] In one embodiment, if the path loss for power control of the sidelink channel is determined based on the best downlink beam (e.g., in mode 1), the best downlink beam is the best beam for receiving a synchronization signal block (SSB) measured by the user equipment in a specific time window; if the power for power control of the sidelink channel is determined based on the best sidelink beam (e.g., in mode 2), the best sidelink beam is the best beam according to beam management between the user equipment and another user equipment communicating with the user equipment.

[0099] In one embodiment, if there is no beam management for the case of determining the path loss for power control of the sidelink channel based on the best sidelink, the received power of the reference signal reported from another UE will be used for the path loss based on the implementation of the UE.

[0100] ​Systematically shows an example of a user equipment according to an embodiment of the present disclosure. As ​ shown, the UE 100 includes an encoder 901, a modulator 902, a resource mapper 903, a resource multiplexer 904, a first signal processor 905, a transmitter 906, an antenna 907, a receiver 908, a second signal processor 909, a resource demultiplexer 910, a resource demapper 911, a demodulator 912, a decoder 913, and a control circuit 914.

[0101] For example, the encoder 901 performs an encoding process on the transmission data, and the modulator 902 performs a modulation process on the encoded transmission data to generate data symbols. The resource mapper 903 maps the data symbols to physical resources. For example, when the transmission data belongs to uplink data to be transmitted to the gNB, the resource mapper 903 maps the data symbols to a bandwidth part (BWP) allocated for uplink transmission and reception. The resource multiplexer 904 multiplexes the data symbols and possible control information and / or synchronization information. The first signal processor 905 performs signal processing on the multiplexed signal output from the resource multiplexer 904. The transmitter 906 transmits the processed uplink signal to, for example, the gNB via the antenna 907.

[0102] In addition, the receiver 908 may receive a downlink transmission from the gNB via the antenna 907. The downlink transmission may include indication information for a power determination basis for sidelink transmission, the indication information indicating a set of (a plurality of) downlink reference signals for determining a path loss for power control of a sidelink channel to be transmitted by the user equipment, or determining a path loss for power control of a sidelink channel based on the (a plurality of) sidelink reference signals. The second signal processor 909 performs signal processing on the downlink signal received by the receiver 908. The resource demultiplexer 910 demultiplexes the processed downlink signal into downlink data and possible downlink control information and / or synchronization information. The resource demapper 911 demaps sidelink data symbols and possible downlink control information and / or synchronization information from physical resources. The demodulator 912 performs a demodulation process on the downlink data symbols, and the decoder 913 performs a decoding process on the demodulated downlink data symbols to obtain received data. In addition, the demodulator 912 may also perform a demodulation process on possible downlink control information and / or synchronization information, and the decoder 913 performs a decoding process on the demodulated downlink control information and / or synchronization information to output the indication information to the circuit 914 for controlling sidelink transmission and reception. Then, the circuit 914 may determine a path loss for power control of a sidelink channel based on the indication information, and further control the power of the transmitter 906 for transmission of the sidelink channel.

[0103] In one embodiment, when the transmission data executed by the encoder 901 belongs to sidelink data to be transmitted to another UE, the resource mapper 903 maps the data symbols to the BWP allocated for sidelink transmission and reception. The resource multiplexer 904 multiplexes the data symbols and possible control information and / or synchronization information. The first signal processor 905 performs signal processing on the multiplexed signal output from the resource multiplexer 904. The transmitter 906 transmits the processed sidelink signal to another UE, for example, via the antenna 907.

[0104] In one embodiment, the receiver 908 may receive a sidelink transmission from another UE via the antenna 907. The sidelink transmission may include a plurality of sidelink beams. In this case, the circuit 914 may determine the path loss for power control of the sidelink channel based on a set of (multiple) reference signals associated with the best sidelink beam determined by the UE 100 among the plurality of sidelink beams. In one embodiment, the best sidelink beam is the best beam according to beam management between the user equipment and another UE communicating with the UE 100. Similarly, based on this determination, the circuit 914 may control the power of the transmitter 906 for transmission of the sidelink channel.

[0105] In another embodiment, the receiver 908 may receive a downlink transmission from the gNB via the antenna 907. The downlink transmission may include a plurality of downlink beams. In this case, the circuit 914 may determine the path loss for power control of the sidelink channel based on a set of (multiple) reference signals associated with the best downlink beam determined by the UE 100 among the plurality of downlink beams. In one embodiment, the best downlink beam is the best beam for receiving the synchronization signal block (SSB) measured by the user equipment in a specific time window.

[0106] Note that ​ the UE 100 shown in ​ can be used as ​ the UE 100 shown in

[0107] The present disclosure can be implemented by software, hardware, or the cooperation of software and hardware. Each functional block used in the description of each of the above embodiments can be partially or entirely implemented by LSI such as an integrated circuit, and each process described in each embodiment can be partially or entirely controlled by the same LSI or a combination of LSIs. The LSI can be formed as a single chip, or can be formed as one chip to include some or all of the functional blocks. The LSI can include data input and output coupled thereto. Depending on the degree of integration, the LSI here can be referred to as an IC, a system LSI, a super LSI, or an ultra LSI. However, the technology for implementing integrated circuits is not limited to LSI and can be achieved by using dedicated circuits, general-purpose processors, or dedicated processors. Additionally, an FPGA (field programmable gate array) that can be programmed after manufacturing the LSI or a reconfigurable processor that can reconfigure the connection and setting of circuit units inside the LSI can be used. The present disclosure can be implemented as digital processing or analog processing. If future integrated circuit technology replaces LSI due to advancements in semiconductor technology or other derivative technologies, future integrated circuit technology can be used to integrate functional blocks. Biotechnology can also be applied.

[0108] The present disclosure can be implemented by any kind of device, equipment, or system having a communication function, which is referred to as a communication device.

[0109] Some non-limiting examples of such communication devices include telephones (e.g., cellular (cell) phones, smart phones), tablet computers, personal computers (PCs) (e.g., laptops, desktops, netbooks), cameras (e.g., digital still / video cameras), digital players (digital audio / video players), wearable devices (e.g., wearable cameras, smart watches, tracking devices), game consoles, digital book readers, remote health / telemedicine (remote healthcare and medicine) devices, and transportation vehicles (e.g., cars, airplanes, ships) that provide a communication function, and various combinations thereof.

[0110] The communication device is not limited to being portable or mobile, and can also include any kind of non-portable or fixed device, equipment, or system, such as smart home devices (e.g., appliances, lighting, smart meters, control panels), vending machines, and any other "things" in the "Internet of Things (IoT)" network.

[0111] Communication can include exchanging data through, for example, cellular systems, wireless LAN systems, satellite systems, etc., and various combinations thereof.

[0112] The communication apparatus may include a device such as a controller or a sensor that is coupled to a communication device that performs the communication functions described in the present disclosure. For example, the communication apparatus may include a controller or a sensor that generates a control signal or a data signal used by the communication device that performs the communication functions of the communication apparatus.

[0113] Communication devices may also include infrastructure equipment such as base stations, access points, and any other device, equipment, or system that communicates with or controls devices such as the non-limiting examples above.

[0114] The embodiments of the present disclosure can at least provide the following topics:

[0115] (1) A user device comprising:

[0116] a receiver that receives indication information of a power determination basis for sidelink transmission, the indication information indicating a set of downlink reference signals used for determining a path loss for power control of a sidelink channel to be transmitted by a user equipment, or the path loss for power control of the sidelink channel is determined based on the sidelink reference signal(s); and

[0117] The circuit determines a path loss for power control of a sidelink channel based on the indication information.

[0118] (2) The user equipment according to (1), wherein

[0119] For different resource allocation modes, power control of the user equipment is performed differently.

[0120] (3) The user equipment according to (1) or (2), wherein

[0121] The indication information is transmitted through at least one of downlink control information (DCI), radio resource control (RRC) information, medium access control (MAC) information, or any combination thereof.

[0122] (4) The user equipment according to (3), wherein

[0123] The indication information indicates a power determination basis for sidelink transmission by an index through downlink control information (DCI), and

[0124] The association of the power determination basis for sidelink transmission with the index is configured, preconfigured, or specified through radio resource control (RRC) information.

[0125] (5) A user device according to any one of (1) to (3), wherein

[0126] The set of (multiple) downlink reference signals includes at least one of a primary synchronization signal (PSS), a secondary synchronization signal (SSS), and a channel state information reference signal (CSI-RS).

[0127] (6). The user equipment according to (5), wherein

[0128] The primary synchronization signal (PSS), the secondary synchronization signal (SSS), and / or the channel state information reference signal (CSI-RS) in the set of (multiple) downlink reference signals are from one or more downlink beams.

[0129] (7). The user equipment according to any one of (1)-(6), wherein the indication information separately indicates a power determination basis for sidelink transmission for a physical sidelink control channel (PSCCH) and a physical sidelink shared channel (PSSCH).

[0130] (8). The user equipment according to any one of (1)-(7), wherein the indication information indicates a power determination basis for sidelink transmission for a physical sidelink feedback channel (PSFCH) separated from the power determination basis for sidelink transmission for PSCCH and PSSCH.

[0131] (9). The user equipment according to any one of (1) to (8), wherein the indication information indicates the same power determination basis for any two or three of a physical sidelink control channel (PSCCH), a physical sidelink shared channel (PSSCH), and a physical sidelink feedback channel (PSFCH).

[0132] (10). The user equipment according to (7), wherein the path loss for power control of PSCCH and the path loss for power control of PSSCH are in a fixed relationship.

[0133] (11). The user equipment according to (1), wherein the parameters P(0) and alpha for power control of the sidelink channel are configured, pre-configured, or associated with the path loss for power control of the sidelink channel.

[0134] (12). A user equipment, comprising:

[0135] A receiver that receives indication information of a power determination basis for sidelink transmission, the indication information indicating a set of (multiple) downlink reference signals for determining a path loss for power control of a sidelink channel to be transmitted by the user equipment; and

[0136] A circuit that determines a path loss for power control of the sidelink channel based on the indication information.

[0137] (13). The user equipment according to (12), wherein

[0138] The indication information is sent via sidelink control information (SCI).

[0139] (14). The user equipment according to (12) or (13), wherein

[0140] The sidelink channel is a physical sidelink feedback channel (PSFCH).

[0141] (15). A user equipment, comprising:

[0142] A receiver that receives a plurality of downlink or sidelink beams; and

[0143] A circuit that determines a path loss for power control of a sidelink channel based on a set of (multiple) reference signals associated with the best downlink or sidelink beam determined by the user equipment among the plurality of downlink or sidelink beams.

[0144] (16). The user equipment according to (13), wherein

[0145] The best downlink beam is the best beam for receiving a synchronization signal block (SSB) measured by the user equipment within a specific time window; or

[0146] The best sidelink beam is the best beam according to beam management between the user equipment and another user equipment communicating with the user equipment.

[0147] (17). A wireless communication method for a user equipment, comprising:

[0148] Receiving indication information for a basis of power determination for sidelink transmission, the indication information indicating a set of (multiple) downlink reference signals for determining a path loss for power control of a sidelink channel to be sent by the user equipment, or the path loss for power control of the sidelink channel is determined based on (multiple) sidelink reference signals; and

[0149] Determining a path loss for power control of the sidelink channel based on the indication information.

[0150] (18). The wireless communication method according to (17), wherein

[0151] For different resource allocation modes, power control of the user equipment is performed differently.

[0152] (19). The wireless communication method according to (17) or (18), wherein

[0153] The indication information is sent by at least one of downlink control information (DCI), radio resource control (RRC) information, medium access control (MAC) information, or any combination thereof.

[0154] (20). The user equipment according to (19), wherein

[0155] the indication information indicates, by means of downlink control information (DCI), an index for a power determination basis for sidelink transmission, and

[0156] the association between the power determination basis for sidelink transmission and the index is configured, preconfigured, or specified by radio resource control (RRC) information.

[0157] (21). The user equipment according to any one of (17)-(19), wherein

[0158] the set of (multiple) downlink reference signals includes at least one of a primary synchronization signal (PSS), a secondary synchronization signal (SSS), and a channel state information reference signal (CSI-RS).

[0159] (22). The user equipment according to (21), wherein

[0160] the primary synchronization signal (PSS), the secondary synchronization signal (SSS), and / or the channel state information reference signal (CSI-RS) in the set of (multiple) downlink reference signals are from one or more downlink beams.

[0161] (23). The user equipment according to any one of (17)-(22), wherein the indication information separately indicates a power determination basis for sidelink transmission for a physical sidelink control channel (PSCCH) and a physical sidelink shared channel (PSSCH).

[0162] (24). The user equipment according to any one of (17)-(23), wherein the indication information indicates a power determination basis for sidelink transmission for a physical sidelink feedback channel (PSFCH) that is separated from the power determination basis for sidelink transmission for PSCCH and PSSCH.

[0163] (25). The user equipment according to any one of (17) to (24), wherein the indication information indicates the same power determination basis for any two or three of a physical sidelink control channel (PSCCH), a physical sidelink shared channel (PSSCH), and a physical sidelink feedback channel (PSFCH).

[0164] (26). The user equipment according to (25), wherein the path loss for power control of the PSCCH and the path loss for power control of the PSSCH are in a fixed relationship.

[0165] (27). The user equipment according to (17), wherein the parameters P(0) and alpha for power control of the sidelink channel are configured, pre-configured, or associated with the path loss for power control of the sidelink channel.

[0166] (28). A wireless communication method for a user equipment, comprising:

[0167] Receiving indication information for a power determination basis for sidelink transmission, the indication information indicating a set of (multiple) downlink reference signals for determining the path loss for power control of the sidelink channel to be transmitted by the user equipment; and

[0168] Determining the path loss for power control of the sidelink channel based on the indication information.

[0169] (29). The wireless communication according to (28), wherein

[0170] The indication information is transmitted via sidelink control information (SCI).

[0171] (30). The wireless communication method according to (28) or (29), wherein

[0172] The sidelink channel is a physical sidelink feedback channel (PSFCH).

[0173] (31). A wireless communication method for a user equipment, comprising:

[0174] Receiving multiple downlink or sidelink beams; and

[0175] Determining the path loss for power control of the sidelink channel based on a set of (multiple) reference signals associated with the best downlink or sidelink beam determined by the user equipment among the multiple downlink or sidelink beams.

[0176] (32). The wireless communication method according to (31), wherein

[0177] The best downlink beam is the best beam for receiving a synchronization signal block (SSB) measured by the user equipment within a specific time window; or

[0178] The best sidelink beam is the best beam according to beam management between the user equipment and another user equipment communicating with the user equipment.

Claims

1. A terminal, comprising: a receiver, receiving indication information for power control of transmission on a sidelink channel; and a control circuit, when the indication information indicates that a downlink reference signal is used for determination of path loss in the power control of the sidelink channel, determining the path loss according to a downlink reference signal determined from a plurality of downlink reference signals, wherein each of the plurality of downlink reference signals is respectively associated with one of a plurality of beams, and parameters P0 and parameter alpha for the power control of the sidelink channel are common among the plurality of beams.

2. The terminal according to claim 1, wherein the indication information is sent via downlink control information DCI, radio resource control RRC information, media access control MAC information, or any combination thereof.

3. The terminal according to claim 1, wherein the set of downlink reference signals includes a primary synchronization signal PSS and / or a secondary synchronization signal SSS.

4. The terminal according to claim 3, wherein the primary synchronization signal PSS and / or the secondary synchronization signal SSS in the set of downlink reference signals are from one or more downlink beams.

5. The terminal according to claim 1, wherein the indication information respectively indicates the power control for a physical sidelink feedback channel PSFCH and the power control for a physical sidelink shared channel PSSCH.

6. The terminal according to claim 1, wherein parameters P0 and parameter alpha for the power control of the sidelink channel are selected according to the indication information.

7. The terminal according to claim 1, wherein in a first case where a sidelink reference signal is used for the determination of the path loss and in a second case where a downlink reference signal is used for the determination of the path loss, different formulas are used for the power control of the sidelink channel.

8. A communication method, comprising: receiving indication information for power control of transmission on a sidelink channel; and when the indication information indicates that a downlink reference signal is used for determination of path loss in the power control of the sidelink channel, determining the path loss according to a downlink reference signal determined from a plurality of downlink reference signals, wherein each of the plurality of downlink reference signals is respectively associated with one of a plurality of beams, and parameters P0 and parameter alpha for the power control of the sidelink channel are common among the plurality of beams.

9. A base station, comprising: a circuit, generating indication information related to power control of transmission on a sidelink channel; and a transmitter, sending the indication information to a terminal. In a case where the indication information indicates determination of path loss in the power control of the sidelink channel using a downlink reference signal, the path loss is determined at the terminal according to a downlink reference signal determined from a plurality of downlink reference signals, where each of the plurality of downlink reference signals is respectively associated with one of a plurality of beams, and a parameter P0 and a parameter alpha for the power control of the sidelink channel are common among the plurality of beams.

10. The base station according to claim 9, wherein the indication information is sent by downlink control information DCI, radio resource control RRC information, media access control MAC information, or any combination thereof.

11. The base station according to claim 9, wherein the set of downlink reference signals includes a primary synchronization signal PSS and / or a secondary synchronization signal SSS.

12. The base station according to claim 11, wherein the primary synchronization signal PSS and / or the secondary synchronization signal SSS in the set of downlink reference signals are from one or more downlink beams.

13. The base station according to claim 9, wherein the indication information respectively indicates the power control for a physical sidelink feedback channel PSFCH and the power control for a physical sidelink shared channel PSSCH.

14. The base station according to claim 9, wherein the parameter P0 and the parameter alpha for the power control of the sidelink channel are selected according to the indication information.

15. The base station according to claim 9, wherein in a first case of using the sidelink reference signal for the determination of the path loss and in a second case of using a downlink reference signal for the determination of the path loss, different formulas are used for the power control of the sidelink channel.

16. A communication method, comprising: generating indication information related to power control for transmission of a sidelink channel; and sending the indication information to a terminal, in a case where the indication information indicates determination of path loss in the power control of the sidelink channel using a downlink reference signal, determining the path loss according to a downlink reference signal determined from a plurality of downlink reference signals, where each of the plurality of downlink reference signals is respectively associated with one of a plurality of beams, and a parameter P0 and a parameter alpha for the power control of the sidelink channel are common among the plurality of beams.

17. An integrated circuit, comprising: a receiving circuit that controls reception of indication information for power control of transmission of a sidelink channel; and Determination circuit, which is controlled as follows: when the indication information indicates the determination of path loss in the power control of the sidelink channel using a downlink reference signal, the path loss is determined according to a downlink reference signal determined from a plurality of downlink reference signals, wherein each of the plurality of downlink reference signals is respectively associated with one of a plurality of beams, and the parameter P0 and the parameter alpha for the power control of the sidelink channel are common among the plurality of beams.

18. An integrated circuit, comprising: A generation circuit, which controls the generation of indication information related to the power control for the transmission of the sidelink channel; And A transmission circuit, which controls the transmission of the indication information to a terminal. When the indication information indicates the determination of path loss in the power control of the sidelink channel using a downlink reference signal, the path loss is determined according to a downlink reference signal determined from a plurality of downlink reference signals, wherein each of the plurality of downlink reference signals is respectively associated with one of a plurality of beams, and the parameter P0 and the parameter alpha for the power control of the sidelink channel are common among the plurality of beams.

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