User equipment and wireless communication method

Abstract

A first UE, a second UE and a wireless communication method are provided. The first UE includes a memory; a processor coupled with the memory and operable to execute the code to cause the first UE to receive signaling to support subsequent communication with the second UE over the sidelink, the signaling including first configuration information of a first set of open loop parameters usable by the second UE to calculate transmit power based on downlink path loss between the network node and the first UE, and including second configuration information of a second set of open-loop parameters usable by the second UE to calculate transmit power based on sidelink path loss between the second UE and the first UE; receiving a reference signal from the second UE over the sidelink; obtaining a reference signal received power measurement based on the received reference signal; transmitting a report indicating a reference signal received power measurement; and receiving, from the second UE, a sidelink transmission associated with a transmit power based on the reference signal received power measurement and the first set of open-loop parameters, the second set of open-loop parameters, or any combination thereof.

Description

[0001] This application is a divisional application of the invention patent application with the application date of August 12, 2020, application number 202080057437.2, and invention name “Side Link Power Control”.

[0002] Cross-references

[0003] This patent application claims priority to U.S. Provisional Patent Application No. 62 / 886,223, entitled “SIDELINK POWERCONTROL,” filed by FAKOORIAN et al. on August 13, 2019, and U.S. Patent Application No. 16 / 990,587, entitled “SIDELINK POWER CONTROL,” filed by FAKOORIAN et al. on August 11, 2020, each of which is assigned to the present assignee. Background Art

[0004] The following relates generally to wireless communications, and more particularly to sidelink power control.

[0005] Wireless communication systems are widely deployed to provide various types of communication content, such as voice, video, packet data, messaging, broadcast, etc. These systems are capable of supporting communication with multiple users by sharing available system resources (e.g., time, frequency, and power). Examples of such multiple access systems include fourth generation (4G) systems, such as long term evolution (LTE) systems, advanced LTE (LTE-A) systems, or LTE-A Pro systems, and fifth generation (5G) systems, known as new radio (NR) systems. These systems may employ techniques such as code division multiple access (CDMA), time division multiple access (TDMA), frequency division multiple access (FDMA), orthogonal frequency division multiple access (OFDMA), or discrete Fourier transform spread orthogonal frequency division multiplexing (DFT-S-OFDM).

[0006] A wireless multiple-access communication system may include several base stations or network access nodes, each of which simultaneously supports communications for multiple communication devices, which may be further referred to as user equipment (UE). Some wireless communication systems may support sidelink communications between two UEs (e.g., sidelink communications in addition to uplink and downlink communications between a UE and a base station). Summary of the invention

[0007] The described technology relates to improved methods, systems, devices and apparatuses for supporting sidelink power control. In general, the described technology provides for efficiently performing and reporting reference signal received power (RSRP) measurements. In particular, the technology described herein may allow a user equipment (UE) to effectively identify a reference signal on which to perform RSRP measurements (e.g., based on signaling from a base station), identify when to report RSRP measurements (e.g., aperiodically, periodically, or semi-persistently), and identify a channel on which to report RSRP measurements (e.g., a sidelink channel or an uplink channel). In addition, the technology described herein may also allow a UE to effectively identify open-loop parameters for determining an appropriate transmit power to transmit to another UE via a sidelink.

[0008] A method of wireless communication at a first UE is described. The method may include receiving signaling to support subsequent communication with a second UE via a sidelink, the signaling indicating a set of one or more types of reference signals that can be used for reference signal received power measurement; selecting at least one type of reference signal from the set for performing the reference signal received power measurement; receiving the at least one type of reference signal from the second UE via a sidelink; performing a reference signal received power measurement on the received reference signal; and reporting the reference signal received power measurement.

[0009] An apparatus for wireless communication at a first UE is described. The apparatus may include a processor, a memory coupled to the processor, and instructions stored in the memory. The instructions may be executed by the processor to cause the apparatus to receive signaling to support subsequent communication with a second UE via a side link, the signaling indicating a set of one or more types of reference signals that can be used for reference signal received power measurement; select at least one type of reference signal from the set for performing the reference signal received power measurement; receive the at least one type of reference signal from the second UE via a side link; perform reference signal received power measurement on the received reference signal; and report the reference signal received power measurement.

[0010] Another apparatus for wireless communication at a first UE is described. The apparatus may include a component for receiving signaling to support subsequent communication with a second UE via a sidelink, the signaling indicating a set of one or more types of reference signals that can be used for reference signal received power measurement; a component for selecting at least one type of reference signal from the set for performing the reference signal received power measurement; a component for receiving the at least one type of reference signal from the second UE via a sidelink; a component for performing reference signal received power measurement on the received reference signal; and a component for reporting the reference signal received power measurement.

[0011] A non-transitory computer-readable medium is described, storing code for wireless communication at a first UE. The code may include instructions, which are executed by a processor to receive signaling to support subsequent communication with a second UE via a side link, the signaling indicating a set of one or more types of reference signals that can be used for reference signal received power measurement; select at least one type of reference signal from the set for performing the reference signal received power measurement; receive at least the one type of reference signal from the second UE via the side link; perform reference signal received power measurement on the received reference signal; and report the reference signal received power measurement.

[0012] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, selecting at least one type of reference signal from the set for use in the reference signal received power measurement may include operations, features, components, or instructions for receiving control information indicating resources on which at least one type of reference signal may be received, and selecting at least one type of reference signal for performing the reference signal received power measurement based on receiving the control information.

[0013] In some examples of the methods, apparatuses, and non-transitory computer-readable media described herein, the resources on which the at least one type of reference signal is to be received include aperiodic resources, semi-persistent resources, or periodic resources. In some examples of the methods, apparatuses, and non-transitory computer-readable media described herein, the control information includes downlink control information from a base station or sidelink control information from the second UE. In some examples of the methods, apparatuses, and non-transitory computer-readable media described herein, the set of one or more types of reference signals includes a sounding reference signal (SRS), a demodulation reference signal (DMRS), a sidelink channel state information reference signal (SL-CSI-RS), a sidelink synchronization signal block (SL-SSB), or any combination thereof.

[0014] Some examples of the methods, apparatuses, and non-transitory computer-readable media described herein may also include operations, features, components, or instructions for receiving control information indicating that the first UE may report the reference signal power measurement in response to the received reference signal, and reporting the reference signal received power measurement based on receiving the control information. In some examples of the methods, apparatuses, and non-transitory computer-readable media described herein, the control information includes DCI from a base station or sidelink control information (SCI) from the second UE. Some examples of the methods, apparatuses, and non-transitory computer-readable media described herein may also include operations, features, components, or instructions for determining that the signal to interference noise ratio of the received reference signal may be above a threshold or below a threshold, and reporting the reference signal received power measurement based on the determination.

[0015] Some examples of the methods, apparatuses, and non-transitory computer-readable media described herein may also include operations, features, components, or instructions for identifying a periodicity for reporting the reference signal received power measurement, and reporting the reference signal received power measurement based on the identified periodicity. Some examples of the methods, apparatuses, and non-transitory computer-readable media described herein may also include operations, features, components, or instructions for identifying a periodicity and duration for reporting the reference signal received power measurement, receiving control information for activating reporting of the reference signal received power measurement, and reporting the reference signal received power measurement based on the identified periodicity and duration.

[0016] Some examples of methods, apparatuses, and non-transitory computer-readable media described herein may also include operations, features, components, or instructions for receiving control information indicating that the first UE may report a reference signal received power measurement on a PUSCH or a PUCCH, and reporting the reference signal received power measurement to a base station on the PUSCH or the PUCCH based on receiving the control information. In some examples of methods, apparatuses, and non-transitory computer-readable media described herein, the control information includes a DCI from a base station.

[0017] Some examples of methods, apparatuses, and non-transitory computer-readable media described herein may also include operations, features, components, or instructions for receiving control information indicating that the first UE may report the reference signal received power measurement on a physical sidelink shared channel (PSSCH) or a physical sidelink feedback channel (PSFCH), and reporting the reference signal received power measurement to the second UE on the PSSCH or the PSFCH based on receiving the control information. In some examples of methods, apparatuses, and non-transitory computer-readable media described herein, the control information includes sidelink control information (SCI) from the second UE.

[0018] Some examples of the methods, apparatuses, and non-transitory computer-readable media described herein may also include operations, features, components, or instructions for identifying a channel on which the reference signal received power measurement is to be reported based on an indication in the signaling, and reporting the reference signal received power measurement on the channel. Some examples of the methods, apparatuses, and non-transitory computer-readable media described herein may also include operations, features, components, or instructions for determining that the first UE can be scheduled to report the reference signal received power measurement and send uplink data or uplink control information (UCI) to the base station at the same time interval, and based on the determination, reporting the reference signal received power measurement to the second UE on a physical sidelink shared channel (PSSCH) or a physical sidelink feedback channel (PSFCH).

[0019] In some examples of the methods, apparatuses, and non-transitory computer-readable media described herein, the signaling configures a first set of open-loop parameter sets that can be used by the first UE to calculate a transmit power for transmissions to the base station on an uplink, and wherein the signaling configures a second set of open-loop parameter sets that can be used by the first UE to calculate a transmit power for transmissions to the second UE on a sidelink. Some examples of the methods, apparatuses, and non-transitory computer-readable media described herein may also include operations, features, components, or instructions for receiving control information indicating that the open-loop parameter sets in the first group are for the first UE to use to calculate the transmit power for reporting the reference signal received power measurement to the base station on the uplink, and receiving control information indicating that the open-loop parameter sets in the second group are for the first UE to use to calculate the transmit power for reporting the reference signal received power measurement to the second UE on the sidelink.

[0020] Some examples of the methods, apparatuses, and non-transitory computer-readable media described herein may also include operations, features, components, or instructions for receiving an indication of a transmit power used by the second UE to transmit the reference signal; determining a path loss associated with the sidelink based on the transmit power used by the second UE to transmit the reference signal and the reference signal received power measurement; and determining a transmit power for reporting the reference signal received power measurement based on the path loss, wherein the report may be to the second UE. Some examples of the methods, apparatuses, and non-transitory computer-readable media described herein may also include operations, features, components, or instructions for receiving an indication of an open-loop parameter set from the second UE for determining the transmit power for reporting the reference signal received power measurement; and determining a transmit power for reporting the reference signal received power measurement based on the open-loop parameter set.

[0021] Some examples of methods, apparatus, and non-transitory computer-readable media described herein may also include operations, features, components, or instructions for receiving a TPC indicating a transmit power for reporting the reference signal received power measurement; and determining a transmit power for reporting the reference signal received power measurement based on the TPC. In some examples of methods, apparatus, and non-transitory computer-readable media described herein, the signaling indicating a set of one or more types of reference signals that can be used to perform the reference signal received power measurement can be higher layer signaling.

[0022] A method for wireless communication at a second UE is described. The method may include identifying at least one type of reference signal from a set of one or more types of reference signals to send to a first UE via a sidelink, wherein the at least one type of reference signal will support reference signal received power measurement by the first UE; sending control information to the first UE via the sidelink indicating resources on which the at least one type of reference signal will be sent to the first UE; and sending the at least one type of reference signal to the first UE via the sidelink on the indicated resources.

[0023] An apparatus for wireless communication at a first UE is described. The apparatus may include a processor, a memory coupled to the processor, and instructions stored in the memory. The instructions may be executed by the processor to cause the apparatus to identify at least one type of reference signal from a set of one or more types of reference signals to be sent to a first UE via a sidelink, wherein the at least one type of reference signal will support reference signal received power measurement by the first UE; send control information to the second UE via the sidelink indicating resources on which the at least one type of reference signal will be sent to the first UE; and send the at least one type of reference signal to the first UE via the sidelink on the indicated resources.

[0024] Another apparatus for wireless communication at a second UE is described. The apparatus may include components for identifying at least one type of reference signal from a set of one or more types of reference signals to send to a first UE via a sidelink, wherein the at least one type of reference signal will support reference signal received power measurements by the first UE; components for sending to the first UE via the sidelink control information indicating resources on which the at least one type of reference signal will be sent to the first UE; and components for sending to the first UE via the sidelink the at least one type of reference signal on the indicated resources.

[0025] A non-transitory computer-readable medium is described that stores code for wireless communication at a second UE. The code may include instructions that are executed by a processor to identify at least one type of reference signal from a set of one or more types of reference signals to send to a first UE via a sidelink, wherein the at least one type of reference signal will support reference signal received power measurement by the first UE; send control information to the first UE via the sidelink indicating resources on which the at least one type of reference signal will be sent to the first UE; and send the at least one type of reference signal to the first UE via the sidelink on the indicated resources.

[0026] Some examples of methods, apparatuses, and non-transitory computer-readable media described herein may also include operations, features, components, or instructions for receiving a reference signal received power measurement from the first UE, the reference signal received power measurement being based on the reference signal. Some examples of methods, apparatuses, and non-transitory computer-readable media described herein may also include operations, features, components, or instructions for forwarding the reference signal received power measurement to a base station. Some examples of methods, apparatuses, and non-transitory computer-readable media described herein may also include operations, features, components, or instructions for determining a transmit power for subsequent transmissions to the first UE via the sidelink based on the reference signal received power measurement.

[0027] In some examples of the methods, apparatuses, and non-transitory computer-readable media described herein, the control information further indicates that the first UE may report the reference signal received power measurement based on the transmitted reference signal. In some examples of the methods, apparatuses, and non-transitory computer-readable media described herein, the control information further indicates that the first UE may report the reference signal received power measurement on a PUSCH, a PUCCH, a physical sidelink shared channel (PSSCH), or a physical sidelink feedback channel (PSFCH). Some examples of the methods, apparatuses, and non-transitory computer-readable media described herein may also include operations, features, components, or instructions for sending signaling indicating the set of one or more types of reference signals to the first UE via the sidelink, wherein the set of one or more types of reference signals corresponds to multiple types of reference signals for which reference signal received power measurements may be performed by the first UE.

[0028] In some examples of the methods, apparatuses, and non-transitory computer-readable media described herein, the signaling configures a first set of open-loop parameter sets, the first set of open-loop parameter sets being used by the first UE to calculate a transmit power for transmissions to a base station on an uplink, and wherein the signaling configures a second set of open-loop parameter sets, the second set of open-loop parameter sets being used by the first UE to calculate a transmit power for transmissions to the second UE on a sidelink. Some examples of the methods, apparatuses, and non-transitory computer-readable media described herein may also include operations, features, components, or instructions for sending an indication of an open-loop parameter set in the first group to the first UE via the sidelink, the open-loop parameter set in the first group being used by the first UE to calculate a transmit power for reporting the reference signal received power measurement to the base station on the uplink; and sending an indication of an open-loop parameter set in the second group to the first UE via the sidelink, the open-loop parameter set in the second group being used by the first UE to calculate a transmit power for reporting the reference signal received power measurement to the second UE on the sidelink.

[0029] In some examples of the methods, apparatuses, and non-transitory computer-readable media described herein, the signaling indicating a set of one or more types of reference signals that can be used to perform the reference signal received power measurement can be higher layer signaling. Some examples of the methods, apparatuses, and non-transitory computer-readable media described herein can also include operations, features, components, or instructions for sending an indication of the transmit power used to send the reference signal to the first UE via the sidelink.

[0030] Some examples of the methods, apparatuses, and non-transitory computer-readable media described herein may also include operations, features, components, or instructions for receiving, from the first UE via the sidelink, an indication of an open-loop parameter set for determining a transmit power for transmitting the reference signal; and determining the transmit power for transmitting the reference signal based on the open-loop parameter set. Some examples of the methods, apparatuses, and non-transitory computer-readable media described herein may also include operations, features, components, or instructions for receiving a TPC indicating a transmit power for transmitting the reference signal; and determining the transmit power for transmitting the reference signal based on the TPC.

[0031] A method of wireless communication at a base station is described. The method may include identifying a first UE communicating with a second UE via a sidelink; identifying at least one type of reference signal from a set of one or more types of reference signals for the second UE to send to the first UE, wherein the at least one type of reference signal is to be used by the first UE to perform reference signal received power measurements; and sending control information to the first UE and the second UE indicating resources on which the second UE is to send the at least one type of reference signal to the first UE.

[0032] An apparatus for wireless communication at a base station is described. The apparatus may include a processor, a memory coupled to the processor, and instructions stored in the memory. The instructions may be executed by the processor to cause the apparatus to identify a first UE communicating with a second UE via a sidelink; identify at least one type of reference signal from a set of one or more types of reference signals for the second UE to send to the first UE, wherein the at least one type of reference signal is to be used by the first UE to perform reference signal received power measurement; and send control information to the first UE and the second UE indicating resources on which the second UE is to send the at least one type of reference signal to the first UE.

[0033] Another apparatus for wireless communication at a base station is described. The apparatus may include means for identifying a first UE communicating with a second UE via a sidelink; means for identifying at least one type of reference signal from a set of one or more types of reference signals for the second UE to send to the first UE, wherein the at least one type of reference signal is to be used by the first UE to perform reference signal received power measurements; and means for sending control information to the first UE and the second UE indicating resources on which the second UE is to send the at least one type of reference signal to the first UE.

[0034] A non-transitory computer-readable medium is described that stores code for wireless communication at a base station. The code may include instructions that can be executed by a processor to identify a first UE that is communicating with a second UE via a side link; identify at least one type of reference signal from a set of one or more types of reference signals for the second UE to send to the first UE, wherein the at least one type of reference signal is to be used by the first UE to perform reference signal received power measurement; and send control information to the first UE and the second UE indicating resources on which the second UE is to send the at least one type of reference signal to the first UE.

[0035] Some examples of the methods, apparatuses, and non-transitory computer-readable media described herein may also include operations, features, components, or instructions for receiving a reference signal received power measurement performed by the first UE from the first UE or the second UE. Some examples of the methods, apparatuses, and non-transitory computer-readable media described herein may also include operations, features, components, or instructions for determining a transmit power for a subsequent transmission sent by the second UE to the first UE via the sidelink based on the reference signal received power measurement; and sending a TPC indicating a transmit power for a subsequent transmission by the second UE to the first UE.

[0036] In some examples of the methods, apparatuses, and non-transitory computer-readable media described herein, the control information further indicates that the first UE may report the reference signal received power measurement in response to the reference signal. In some examples of the methods, apparatuses, and non-transitory computer-readable media described herein, the control information further indicates that the first UE may report the reference signal received power measurement on a PUSCH, a PUCCH, a physical sidelink shared channel (PSSCH), or a physical sidelink feedback channel (PSFCH).

[0037] Some examples of the methods, apparatuses, and non-transitory computer-readable media described herein may also include operations, features, components, or instructions for sending signaling indicating a set of one or more types of reference signals, wherein the set of one or more types of reference signals corresponds to multiple types of reference signals for which reference signal received power measurements can be performed by the first UE. In some examples of the methods, apparatuses, and non-transitory computer-readable media described herein, the signaling configures a first set of open-loop parameter sets, which are used by the first UE or the second UE to calculate the transmit power of transmissions to the base station on the uplink, and wherein the signaling configures a second set of open-loop parameter sets, which are used by the first UE or the second UE to calculate the transmit power of transmissions through the sidelink.

[0038] Some examples of methods, apparatuses, and non-transitory computer-readable media described herein may also include operations, features, components, or instructions for sending an indication of a set of open-loop parameters in the first group for use by the first UE to calculate transmit power for reporting the reference signal received power measurement to the base station on the uplink, and sending an indication of open-loop parameters in the second set for use by the first UE to calculate the transmit power for reporting the reference signal received power measurement to the second UE on the sidelink. In some examples of methods, apparatuses, and non-transitory computer-readable media described herein, the signaling indicating a set of one or more types of reference signals that may be used for the reference signal received power measurement performed by the first UE may be higher layer signaling.

[0039] A first UE is described. The first UE includes: one or more memories storing processor executable code; and one or more processors coupled to the one or more memories and operable individually or collectively to execute the code so that the first UE: receives signaling to support subsequent communication with a second UE via a sidelink, wherein the signaling includes first configuration information of a first open-loop parameter set, the first open-loop parameter set can be used by the second UE to calculate transmit power based at least in part on a downlink path loss between a network node and the first UE, and wherein the signaling includes second configuration information of a second open-loop parameter set, the second open-loop parameter set can be used by the second UE to calculate transmit power based at least in part on a sidelink path loss between the second UE and the first UE; receives a reference signal from the second UE via the sidelink; obtains a reference signal received power measurement based at least in part on the received reference signal; sends a report indicating the reference signal received power measurement; and receives a sidelink transmission from the second UE, wherein the sidelink transmission is associated with a transmit power based at least in part on the reference signal received power measurement and the first open-loop parameter set, the second open-loop parameter set, or any combination thereof.

[0040] A second UE is described. The second UE includes: one or more memories storing processor executable code; and one or more processors coupled to the one or more memories and operable, individually or collectively, to execute the code so that the second UE: receives signaling to support subsequent communication with a first UE via a sidelink, wherein the signaling includes first configuration information of a first open-loop parameter set, the first open-loop parameter set being usable by the second UE to calculate a transmit power based at least in part on a downlink path loss between a network node and the first UE, and wherein the signaling includes second configuration information of a second open-loop parameter set, the second open-loop parameter set being usable by the second UE to calculate a transmit power based at least in part on a sidelink path loss between the second UE and the first UE; sends a reference signal to the first UE via the sidelink; receives a report indicating a reference signal received power measurement, the reference signal received power measurement being based at least in part on the reference signal; and sends a sidelink transmission to the first UE using a transmit power based at least in part on the reference signal received power measurement and the first open-loop parameter set, the second open-loop parameter set, or any combination thereof.

[0041] A method for wireless communication at a second UE is described, the method comprising: receiving signaling to support subsequent communication with a first UE on a sidelink, wherein the signaling includes first configuration information of a first open-loop parameter set, the first open-loop parameter set can be used by the second UE to calculate the transmit power based at least in part on a downlink path loss between a network node and the first UE, and wherein the signaling includes second configuration information of a second open-loop parameter set, the second open-loop parameter set can be used by the second UE to calculate the transmit power based at least in part on a sidelink path loss between the second UE and the first UE; sending a reference signal to the first UE via the sidelink; receiving a report indicating a reference signal received power measurement, the reference signal received power measurement being based at least in part on the reference signal; and sending a sidelink transmission to the first UE using a transmit power based at least in part on the reference signal received power measurement and the first open-loop parameter set, the second open-loop parameter set, or any combination thereof. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] Figure 1 and Figure 2 An example of a wireless communication system supporting sidelink power control according to aspects of the present disclosure is shown.

[0043] Figure 3 and Figure 4 An example of a process flow to support sidelink power control in accordance with aspects of the present disclosure is shown.

[0044] Figure 5 and Figure 6A block diagram of a device supporting sidelink power control according to aspects of the present disclosure is shown.

[0045] Figure 7 A block diagram of a communication manager supporting sidelink power control in accordance with aspects of the present disclosure is shown.

[0046] Figure 8 A diagram of a system including a device supporting sidelink power control in accordance with aspects of the present disclosure is shown.

[0047] Fig. 9 and Fig.10 A block diagram of a device supporting sidelink power control according to aspects of the present disclosure is shown.

[0048] Fig.11 A block diagram of a communication manager supporting sidelink power control in accordance with aspects of the present disclosure is shown.

[0049] Fig.12 A diagram of a system including a device supporting sidelink power control in accordance with aspects of the present disclosure is shown.

[0050] Figure 13 to Figure 15 A flow chart is shown illustrating a method of supporting sidelink power control according to aspects of the present disclosure. DETAILED DESCRIPTION

[0051] Some wireless communication systems may support sidelink communications between user equipment (UEs) (e.g., in addition to uplink and downlink communications between UEs and base stations). In some cases, a first UE may be scheduled (e.g., by a base station or another UE) to send data or control information to a second UE via a sidelink. In this case, if the power used by the first UE to send via the sidelink is too high, the sidelink transmission may interfere with other communications in the wireless communication system. Alternatively, if the power used by the first UE is too low, the second UE may not be able to correctly receive and decode the sidelink transmission. Therefore, the first UE may support techniques for sidelink power control so that the first UE can determine the appropriate power for sending to the second UE via the sidelink.

[0052] The UE may use the open loop parameters and the measured path loss to determine the transmit power for sidelink and uplink transmissions. However, the techniques used for uplink power control may not be applicable to sidelink power control. For example, in some cases, it may not be appropriate for the UE to use the same reference signal to determine the path loss associated with the uplink channel and the path loss associated with the sidelink channel for uplink and sidelink power control. In addition, it may not be appropriate for the UE to use the same procedure to report measurements for sidelink power control and uplink power control.

[0053] As described herein, a sidelink UE in a wireless communication system may support efficient techniques for sidelink power control. In particular, the sidelink UE may support efficient techniques for performing and reporting reference signal received power (RSRP) measurements for use by another UE or base station to determine path loss for calculating the transmit power of a sidelink transmission. The techniques described herein may allow a UE to effectively identify a reference signal on which to perform RSRP measurements (e.g., based on signaling from a base station), identify when to report RSRP measurements (e.g., aperiodically, periodically, or semi-persistently), and identify a channel on which to report RSRP measurements (e.g., a sidelink channel or an uplink channel). In addition, the techniques described herein may also allow a UE to identify open-loop parameters for use in determining an appropriate transmit power for performing a sidelink transmission to another UE.

[0054] The following describes various aspects of the present disclosure introduced above in the context of a wireless communication system. Examples of processes and signaling exchanges that support sidelink power control are then described. Various aspects of the present disclosure are further illustrated and described through device diagrams, system diagrams, and flow charts related to sidelink power control.

[0055] Figure 1 An example of a wireless communication system 100 supporting sidelink power control according to aspects of the present disclosure is shown. The wireless communication system 100 includes a base station 105, a UE 115, and a core network 130. In some examples, the wireless communication system 100 may be a long term evolution (LTE) network, an advanced LTE (LTE-A) network, an LTE-A Pro network, or a new radio (NR) network. In some cases, the wireless communication system 100 may support enhanced broadband communications, ultra-reliable (e.g., mission-critical) communications, low-latency communications, or communications with low-cost and low-complexity devices.

[0056] The base station 105 may communicate wirelessly with the UE 115 via one or more base station antennas. The base station 105 described herein may include or may be referred to by those skilled in the art as a base transceiver, a radio base station, an access point, a radio transceiver, a NodeB, an eNodeB (eNB), a next generation NodeB or a giga-NodeB (all may be referred to as a gNB), a home NodeB, a home eNodeB, or some other suitable term. The wireless communication system 100 may include different types of base stations 105 (e.g., macro cell base stations or small cell base stations). The UE 115 described herein may be able to communicate with various types of base stations 105 and network devices, including macro eNBs, small cell eNBs, gNBs, relay base stations, etc.

[0057] Each base station 105 may be associated with a particular geographic coverage area 110 in which communications with various UEs 115 are supported. Each base station 105 may provide communications coverage for a respective geographic coverage area 110 via a communications link 125, and the communications link 125 between the base station 105 and the UE 115 may utilize one or more carriers. The communications link 125 shown in the wireless communication system 100 may include an uplink transmission from the UE 115 to the base station 105 (e.g., in a physical uplink control channel (PUCCH) or a physical uplink shared channel (PUSCH)), or a downlink transmission from the base station 105 to the UE 115 (e.g., in a physical downlink control channel (PDCCH) or a physical downlink shared channel (PDSCH)). Downlink transmissions may also be referred to as forward link transmissions, and uplink transmissions may also be referred to as reverse link transmissions.

[0058] The geographic coverage area 110 for the base station 105 can be divided into sectors that constitute a portion of the geographic coverage area 110, and each sector can be associated with a cell. For example, each base station 105 can provide communication coverage for a macro cell, a small cell, a hotspot, or other type of cell, or various combinations thereof. In some examples, the base station 105 can be mobile, thereby providing communication coverage for a mobile geographic coverage area 110. In some examples, different geographic coverage areas 110 associated with different technologies can overlap, and overlapping geographic coverage areas 110 associated with different technologies can be supported by the same base station 105 or different base stations 105. The wireless communication system 100 may include, for example, a heterogeneous LTE / LTE-A / LTE-APro or NR network, in which different types of base stations 105 provide coverage for various geographic coverage areas 110.

[0059] The term "cell" may refer to a logical communication entity for communicating with a base station 105 (e.g., via a carrier), and may be associated with an identifier (e.g., a physical cell identifier (PCID), a virtual cell identifier (VCID)) for distinguishing adjacent cells operating via the same or different carriers. In some examples, an operator may support multiple cells, and different cells may be configured according to different protocol types that may provide access to different types of devices (e.g., machine type communication (MTC), narrowband Internet of Things (NB-IoT), enhanced mobile broadband (eMBB), etc.). In some cases, the term "cell" may refer to a portion (e.g., a sector) of a geographic coverage area 110 on which the logical entity operates.

[0060] The term "carrier" may refer to a set of radio spectrum resources with a defined physical layer structure for supporting communications over the communication link 125. For example, a carrier of the communication link 125 may include a portion of a radio spectrum band that operates according to a physical layer channel for a given radio access technology. Each physical layer channel may carry user data, control information, or other signaling. A carrier may be associated with a predefined frequency channel (e.g., an Evolved Universal Mobile Telecommunications System Terrestrial Radio Access (E-UTRA) Absolute Radio Frequency Channel Number (EARFCN)) and may be located according to a channel raster for discovery by a UE 115. A carrier may be downlink or uplink (e.g., in FDD mode), or configured to carry downlink and uplink communications (e.g., in TDD mode). In some examples, a signal waveform transmitted on a carrier may be composed of multiple subcarriers (e.g., using a multi-carrier modulation (MCM) technique such as orthogonal frequency division multiplexing (OFDM) or discrete Fourier transform spread OFDM (DFT-S-OFDM)).

[0061] UE 115 may be dispersed throughout the wireless communication system 100, and each UE 115 may be stationary or mobile. UE 115 may also be referred to as a mobile device, a wireless device, a remote device, a handheld device, or a subscriber device, or some other suitable term, where "device" may also be referred to as a unit, a station, a terminal, or a client. UE 115 may also be a personal electronic device, such as a cellular phone, a personal digital assistant (PDA), a tablet computer, a laptop computer, or a personal computer. In some examples, UE 115 may also refer to a wireless local loop (WLL) station, an Internet of Things (IoT) device, an Internet of Everything (IoE) device, or an MTC device, etc., which may be implemented in various items such as appliances, vehicles, meters, or the like.

[0062] In some cases, a UE 115 may also be able to communicate directly with other UEs 115 via a sidelink connection (e.g., using a point-to-point (P2P) or device-to-device (D2D) protocol). Such communications may be referred to as D2D or sidelink communications. One or more UEs in a group of UEs 115 utilizing D2D communications may be within a geographic coverage area 110 of a base station 105. In some cases, other UEs 115 in such a group may be outside of the geographic coverage area 110 of a base station 105 or otherwise unable to receive transmissions from the base station 105. In some cases, a group of UEs 115 communicating via D2D communications may utilize a one-to-many (1:M) system, in which each UE 115 transmits to each other UE 115 in the group.

[0063] In some cases, the base station 105 facilitates the scheduling of resources for D2D communications. In other cases, D2D communications are performed between UEs 115 without the involvement of the base station 105. In one example, the sidelink communications may include discovery expression transmissions on a physical sidelink discovery channel (PSSCH) (e.g., to allow near-end devices to discover each other's presence). In another example, the sidelink communications may include control information transmissions on a physical sidelink control channel (PSCCH). In another example, the sidelink communications may include data transmissions on a physical sidelink shared channel (PSSCH). In still another example, the sidelink communications may include feedback transmissions on a physical sidelink feedback channel (PSFCH).

[0064] The base stations 105 may communicate with the core network 130 and may communicate with each other. For example, the base stations 105 may be connected to the core network 130 via a backhaul link 132 (e.g., via S1, N2, N3, or other interface). The base stations 105 may communicate with each other directly (e.g., directly between the base stations 105) or indirectly (e.g., via the core network 130) via a backhaul link 134 (e.g., via X2, Xn, or other interface).

[0065] The core network 130 may provide user authentication, access authorization, tracking, Internet Protocol (IP) connectivity, and other access, routing, or mobility functions. The core network 130 may be an evolved packet core (EPC), which may include at least one mobility management entity (MME), at least one serving gateway (S-GW), and at least one packet data network (PDN) gateway (P-GW). The MME may manage non-access stratum (e.g., control plane) functions such as mobility, authentication, and bearer management for UEs 115 served by base stations 105 associated with the EPC. User IP packets may be transmitted through the S-GW, which itself may be connected to the P-GW. The P-GW may provide IP address allocation and other functions. The P-GW may be connected to the IP services of the network operator. The operator's IP services may include access to the Internet, an intranet, an IP multimedia subsystem (IMS), or a packet switched (PS) streaming service.

[0066] At least some of the network devices, such as base stations 105, may include subcomponents, such as access network entities, which may be examples of access node controllers (ANCs). Each access network entity may communicate with UE 115 through several other access network transport entities, which may be referred to as radio heads, smart radio heads, or transmission / reception points (TRPs). In some configurations, the various functions of each access network entity or base station 105 may be distributed across various network devices (e.g., radio heads and access network controllers) or merged into a single network device (e.g., base station 105).

[0067] In some cases, the wireless communication system 100 may be a packet-based network that operates according to a layered protocol stack. In the user plane, communications at the bearer or packet data convergence protocol (PDCP) layer may be IP-based. The radio link control (RLC) layer may perform packet segmentation and reassembly to communicate on logical channels. The medium access control (MAC) layer may perform priority processing and multiplex logical channels into transport channels. The MAC layer may also provide retransmissions at the MAC layer using hybrid automatic repeat request (HARQ) to improve link efficiency. In the control plane, the radio resource control (RRC) protocol layer may provide the establishment, configuration, and maintenance of an RRC connection between the UE 115 and the base station 105 or the core network 130 that supports the radio bearer of the user plane data. At the physical layer, transport channels may be mapped to physical channels.

[0068] The time interval in LTE or NR can be expressed as a multiple of the basic time unit. For example, the basic time unit can refer to T s =1 / 30,720,000 seconds sampling period. The time interval of communication resources can be organized according to the duration of each radio frame of 10 milliseconds (ms), where the frame period can be expressed as T f=307,200Ts. A radio frame may be identified by a system frame number (SFN) ranging from 0 to 1023. Each frame may include 10 subframes numbered from 0 to 9, and each subframe may have a duration of 1 millisecond. A subframe may be further divided into 2 slots, each slot having a duration of 0.5 milliseconds, and each slot may contain 6 or 7 modulation symbol periods (e.g., depending on the length of the cyclic prefix before each symbol period). In addition to the cyclic prefix, each symbol period may contain 2048 sampling periods. In some cases, a subframe may be the minimum scheduling unit of the wireless communication system 100 and may be referred to as a transmission time interval (TTI). In other cases, the minimum scheduling unit of the wireless communication system 100 may be shorter than a subframe or may be dynamically selected (e.g., in a burst transmission of a shortened TTI (sTTI) or in a selected component carrier using sTTI).

[0069] As described above, the wireless communication system 100 may support sidelink communications between UEs 115 (e.g., in addition to uplink and downlink communications between UEs 115 and base stations 105). In some cases, a first UE 115 may be scheduled (e.g., by a base station 105 or another UE 115) to transmit data or control information to a second UE 115 via a sidelink. In this case, if the power used by the first UE 115 to transmit via the sidelink is too high, the sidelink transmission may interfere with other communications in the wireless communication system 100. Alternatively, if the power used by the first UE 115 is too low, the second UE 115 may not be able to correctly receive and decode the sidelink transmission. Therefore, the first UE 115 may support techniques for sidelink power control so that the first UE 115 may be able to determine the appropriate power for transmitting to the second UE 115 via the sidelink. Sidelink power control may include transmission of a reference signal and reporting of feedback for determining the transmit power of the sidelink transmission.

[0070] In some cases, the wireless communication system may support at least a sidelink channel state information reference signal (CSI-RS) for channel quality indication (CQI) or rank indication (RI) measurement (e.g., where the sidelink CSI-RS is confined to the PSSCH transmission). In some examples (e.g., in LTE systems), for unicast, groupcast, or broadcast sidelink communications, sidelink power control (e.g., open-loop power control) may be based on the path loss between the transmitting UE 115 and the base station 105 (e.g., if the transmitting UE 115 is within coverage, then mitigating interference to uplink reception at the base station 105). In other examples, the sidelink power control may be based on the path loss between the transmitting UE and the receiving UE. In such examples, the receiving UE may report the sidelink RSRP to the transmitting UE, and the transmitting UE may derive the path loss estimate.

[0071] In addition, for sidelink power control, UE 115 can be configured to use only downlink path loss (i.e., between the transmitting UE 115 and the base station 105), only sidelink path loss (i.e., between the transmitting UE 115 and the receiving UE 115), or both downlink path loss and sidelink path loss. When the transmitting UE is configured to use downlink path loss and sidelink path loss for sidelink power control, the minimum value of the power value given by the open-loop power control based on the downlink path loss and the open-loop power control based on the sidelink path loss is used. Specifically, the downlink path loss and the sidelink path loss can be used together with the open-loop parameters in different equations to determine the transmit power, and the minimum transmit power can be used for sidelink transmission. In some cases, the open-loop parameters (P0 and α) can be pre-configured for the downlink path loss and the sidelink path loss (e.g., pre-configured together or separately).

[0072] In some cases, the UE 115 may use open loop parameters and measured path loss to determine the transmit power for sidelink and uplink transmissions. However, the same techniques used for uplink power control may not be applicable to sidelink power control. For example, in some cases, it may not be appropriate for the UE to use the same reference signal to determine the path loss for uplink power control and sidelink power control. In addition, it may not be appropriate for the UE to use the same procedure to report measurements (e.g., RSRP measurements) used to determine the path loss for sidelink power control and uplink power control. The UE 115 in the wireless communication system 100 may support effective techniques for sidelink power control.

[0073] Figure 2An example of a wireless communication system 200 supporting side link power control according to aspects of the present disclosure is shown. The wireless communication system 200 includes a base station 105-a, which may be a reference Figure 1 The wireless communication system 200 also includes UE 115-a and UE 115-b, which may be reference Figure 1 An example of a UE 115 is depicted. UE 115-a and UE 115-b may communicate with each other via a sidelink and may be referred to as sidelink UEs 115 (eg, where UE 115-a may be a transmitting UE and UE 115-b may be a receiving UE). Figure 2 An example is shown in which both sidelink UE 115-a and sidelink UE 115-b are within the coverage area 110-a of base station 105-a, but it should be understood that aspects of the technology described herein may also be used when only one of sidelink UE 115-a and sidelink UE 115-b is within the coverage area 110-a of base station 105-a and when neither sidelink UE 115-a nor sidelink UE 115-b is within the coverage area 110-a of base station 105-a.

[0074] The wireless communication system 200 may implement aspects of the wireless communication system 100. For example, the UE 115 in the wireless communication system 200 may support efficient techniques for sidelink power control. In particular, the UE 115-b may support efficient techniques for performing and reporting RSRP measurements for use by the UE 115-a or the base station 105-a to determine path loss for calculating transmit power for sidelink transmissions.

[0075] exist Figure 2 In an example of , sidelink UEs 115-a and 115-b may be configured to perform sidelink power control prior to a sidelink transmission to determine an appropriate transmit power for the sidelink transmission. As part of the sidelink power control process, sidelink UE 115-a may send a reference signal to sidelink UE 115-b for RSRP measurement. Sidelink UE 115-b may receive the reference signal, perform RSRP measurement, and report the RSRP measurement to sidelink UE 115-a. Sidelink UE 115-a may then determine a path loss between sidelink UE 115-a and sidelink UE 115-b. Sidelink UE 115-a may use the path loss to determine a transmit power for subsequent sidelink transmissions to UE 115-b.

[0076] The base station 105-a may send signaling (e.g., higher layer signaling, such as RRC signaling) indicating a set of one or more types of reference signals that the sidelink UE 115-a may use (can use) for transmission and for the sidelink UE 115-b to perform RSRP measurements. The signaling may also indicate whether each type of reference signal may be transmitted aperiodically, periodically, or semi-persistently. In some cases, the base station 105-a may send the signaling to the UE 115-a, and the UE 115-a may forward the indication of the set of one or more types of reference signals to the UE 115-b. Alternatively, the UE 115-a may independently identify the set of one or more types of reference signals and send the signaling to the UE 115-b (e.g., without receiving signaling from the base station 105-a). The set of one or more types of reference signals may include a sounding reference signal (SRS), a demodulation reference signal (DMRS), a sidelink channel state information reference signal (SL-CSI-RS), or a sidelink synchronization signal block (SL-SSB). If DMRS is used, the DMRS may be sent along with the data or control information (e.g., if the control information is sent by sidelink UE 115-a). If SL-SSB is used, it may be appropriate for sidelink UE 115-a to indicate to sidelink UE 115-b that the SL-SSB is sent by sidelink UE 115-a.

[0077] The base station 105-a may then send downlink control information (DCI) to the sidelink UE 115-a and the sidelink UE 115-b indicating which types of reference signals (e.g., CSI-RS and DMRS) from the set are to be used for RSRP measurement (e.g., all or a subset of the set of one or more types of reference signals). Alternatively, the base station 105-a may send the DCI to the sidelink UE 115-a, and the sidelink UE 115-a may send sidelink control information (SCI) to the sidelink UE 115-b indicating which types of reference signals from the set are to be used for RSRP measurement. For an aperiodic reference signal configuration, the DCI or SCI may indicate which reference signal is activated. In some cases, the indication to the sidelink UE 115-b of which types of reference signals from the set are to be used for RSRP measurement may be an indication of resources for the sidelink UE 115-b to monitor reference signals from the sidelink UE 115-a (e.g., where the resources may be aperiodic, periodic, or semi-persistent). In some examples, the DCI or SCI may not include signaling indicating the set of one or more types of reference signals that may be used for RSRP measurements, but may indicate which types of reference signals the sidelink UEs 115-a and 115-b are to use for RSRP measurements.

[0078] Once the sidelink UE 115-b is able to identify and receive the reference signal from the sidelink UE 115-a, the sidelink UE 115-b can perform RSRP measurements on the reference signal. The sidelink UE 115-b can then report the RSRP measurement to the sidelink UE 115-a or the base station 105-a. In some cases, the sidelink UE 115-b can be configured to report RSRP measurements aperiodically. In this case, the DCI or SCI may trigger the transmission of the RSRP report. That is, the DCI or SCI may indicate that the sidelink UE 115-b will measure the sidelink RSRP through the indicated reference signal symbol sent by the sidelink UE 115-a. As an example, the DCI or SCI may indicate that the sidelink UE 115-b will measure the sidelink RSRP through the reference signal from the sidelink UE 115-a starting from the n1 symbol after the PDCCH triggers the sidelink RSRP measurement until the n2 symbol before the start of the reporting channel for sending the RSRP report. In some examples, the aperiodic RSRP report may be triggered based on a soft ACK / NACK instead of being triggered by a DCI or SCI. For example, if the signal-to-interference-plus-noise ratio (SINR) of the received reference signal is higher than a first threshold ( 1) or below the second threshold ( 2), then the sidelink UE 115-a may report RSRP measurements. In some examples, the sidelink UE 115-b may be configured to periodically or semi-persistently report RSRP measurements (e.g., for Industrial Internet of Things (IIOT) applications where traffic characteristics are deterministic and periodic).

[0079] The RSRP report generated by the sidelink UE 115-b may be sent to the sidelink UE 115-a via a sidelink on the PSSCH or PSFCH, or may be sent to the base station 105-a via an uplink on the PUCCH or PUSCH (e.g., if the sidelink UE 115-b is within the coverage of the base station 105-a). In some cases, the sidelink UE 115-b may send the RSRP report on the PUCCH or PUSCH if the DCI or SCI used to schedule the PUCCH or PUSCH indicates that the RSRP report is to be multiplexed with the PUCCH or PUSCH. In this case, the base station 105-a may schedule and configure sidelink communications between the sidelink UE 115-a and the sidelink UE 115-b, and may determine the transmit power of the sidelink UE 115-a for sidelink transmissions (e.g., mode one scheduling). In some cases, if the DCI or SCI used to schedule the PSSCH or PSFCH indicates that the RSRP report is to be multiplexed with the PSSCH or PSFCH, the sidelink UE 115-b may send an RSRP report on the PSSCH or PSFCH. In this case, the sidelink UE 115-a may schedule and configure sidelink communications with UE 115-b, and may determine the transmit power for sidelink transmissions to the sidelink UE 115-b. (e.g., mode two scheduling, where the transmitting UE has at least some scheduling decision authority, or for partial coverage, where the receiving UE is not within the coverage area of ​​the base station).

[0080] If the sidelink UE 115-b is outside the coverage area of ​​the base station 105-a, the sidelink UE 115-b can trigger an RSRP report from the sidelink UE 115-b. In this case, for mode one scheduling, in which the base station 105-a performs scheduling of the sidelink communication, the RSRP report is sent by the sidelink UE 115-b to the sidelink UE 115-a, and the sidelink UE 115-a can forward the RSRP report to the base station 105-a on the PUCCH or PUSCH (e.g., as indicated by the DCI). In some cases, the above-mentioned signaling (e.g., higher layer signaling) sent by the base station 105-a or UE 115-a to UE 115-b can indicate the channel (or resource) used by the sidelink UE 115-b to send the RSRP report, and the sidelink UE 115-b can send the RSRP report on the indicated channel. Such signaling may be used to indicate the channel that the sidelink UE 115-b uses to send the RSRP report, in the case where a soft ACK / NACK triggers the RSRP report or in the case where the RSRP report is sent periodically.

[0081] In some examples, such signaling may not be used to indicate a channel for aperiodic RSRP reporting because the channel or resource may be reserved, and the sidelink UE 115-a may have to perform blind detection to receive the RSRP report even when the RSRP report is not sent by the sidelink UE. If the sidelink UE 115-b is configured for carrier aggregation or supports multiple simultaneous uplink or sidelink transmissions, and the sidelink UE 115-b is scheduled to perform an uplink transmission simultaneously with the RSRP report transmission, the sidelink UE 115-b may send (or multiplex) the RSRP report on a sidelink channel (e.g., PSSCH or PSFCH, rather than PUCCH or PUSCH). Then, if appropriate, based on the scheduling and coverage mode (e.g., mode one or mode two), or if the sidelink UE 115-a is closer to the base station 105-a than the sidelink UE 115-b, the sidelink UE 115-a may forward the RSRP report to the base station 105-a.

[0082] Figure 3 An example of a process flow 300 for supporting side link power control according to aspects of the present disclosure is shown. The process flow 300 shows aspects of a technique performed by a base station 105-b, which may be a reference to Figure 1 and Figure 2 The process flow 300 also illustrates aspects of the technique performed by the UE 115-c and the UE 115-d, which may be referenced. Figure 1 and Figure 2 An example of a UE 115 is described. Figure 3 In the example, UE 115-c can communicate with UE 115-d via a side link.

[0083] At 305, base station 105-b may send a sidelink configuration to UE 115-d indicating a set of one or more types of reference signals that may be used for RSRP measurement to support subsequent communications between UE 115-c and UE 115-d via the sidelink. Alternatively, UE 115-c may send a sidelink configuration indicating the set of one or more types of reference signals to UE 115-d via the sidelink (e.g., after receiving the sidelink configuration from base station 105-b). The sidelink configuration may be sent in higher layer signaling (e.g., RRC signaling), and the set of one or more types of reference signals may include SRS, DMRS, SL-CSI-RS, or SL-SSB.

[0084] At 315, the base station 105-b may send a DCI to the UE 115-d indicating at least one type of reference signal to use for performing the RSRP measurement. Additionally or alternatively, at 320, the base station 115-c may send an SCI to the UE 115-d indicating the at least one type of reference signal to use for performing the RSRP measurement. The UE 115-d may then select the at least one type of reference signal (e.g., from the set of one or more types of reference signals configured by the sidelink configuration) for performing the RSRP measurement based on receiving the DCI or SCI. Alternatively, the UE 115-d may select the at least one type of reference signal for performing the RSRP measurement regardless of signaling from the base station 105-b or the UE 115-c (e.g., based on a configuration at the UE 115-d).

[0085] At 325, UE 115-c may send a reference signal to UE 115-d via the sidelink, and at 330, UE 115-d may identify and receive the reference signal (e.g., based on the DCI or SCI). UE 115-d may then perform the RSRP measurement on the received reference signal. At 335, UE 115-d may identify a configuration (e.g., aperiodic, periodic, or semi-persistent configuration) and a channel for RSRP reporting. At 340, UE 115-d may send an RSRP report with RSRP measurement to UE 115-c via the sidelink based on the identified configuration and channel (e.g., where, if the base station 105-b schedules sidelink communications, UE 115-c may forward the RSRP report to base station 105-b). Alternatively, at 345, UE 115-d may send an RSRP report with RSRP measurement to base station 105-b based on the identified configuration and channel.

[0086] In some cases, UE 115-d may be configured to report RSRP measurements aperiodically, and UE 115-d may report the RSRP measurements in aperiodic transmissions. Specifically, the DCI or SCI may indicate that UE 115-d will report the RSRP measurements in response to the received reference signal (i.e., the DCI or SCI may trigger the reporting of the RSRP measurements), and UE 115-d may send the RSRP report based on receiving the DCI or SCI. In other cases, UE 115-d may be configured to report RSRP measurements periodically, and UE 115-d may identify the periodicity for reporting the RSRP measurements. UE 115-d may then report the RSRP measurements based on the periodicity (e.g., on periodic resources). In yet other cases, UE 115-d may be configured to report RSRP measurements semi-persistently, and UE 115-d may identify the periodicity and duration for reporting RSRP measurements. The UE 115-d may then report the RSRP measurements based on the periodicity and at the identified duration (e.g., on semi-persistent resources). In this case, the DCI or SCI may trigger the semi-persistent RSRP reporting.

[0087] In some cases, the DCI or SCI may indicate that the UE 115-d is to report the RSRP measurement on the PUSCH or PUCCH, and the UE 115-d may report the RSRP measurement on the PUSCH or PUCCH to the base station 105-b. In other cases, the DCI or SCI may indicate that the UE 115-d is to report the RSRP measurement on the PSSCH or PSFCH, and the UE 115-d may report the RSRP measurement on the PSSCH or PSFCH to the base station 115-c. In still other cases, the sidelink configuration at 305 or 310 may indicate the channel on which the UE 115-d is to report the RSRP measurement, and the UE 115-d may report the RSRP measurement on the indicated channel. In still other cases, if UE 115-d determines that the RSRP measurement is scheduled to be reported in the same time interval as uplink data or control transmission in PUCCH or PUSCH, UE 115-d may report the RSRP measurement to UE 115-c on the PSSCH or PSFCH.

[0088] Figure 4 An example of a process flow 400 for supporting side link power control according to aspects of the present disclosure is shown. The process flow 400 shows aspects of a technique performed by a base station 105-c, which may be a reference to Figure 1-Figure 3The process flow 400 also illustrates aspects of the techniques performed by the UE 115-e and the UE 115-f, which may be referenced. Figure 1-Figure 3 An example of a UE 115 is described. Figure 4 In the example of FIG. 1 , UE 115 - e may communicate with UE 115 - f via a side link.

[0089] At 405, base station 105-c may send an indication of a first set of open-loop parameter sets that may be used by UE 115-e and UE 115-f to calculate a transmit power for uplink transmissions to base station 105-c, and an indication of a second set of open-loop parameter sets that may be used by UE 115-e and UE 115-f to calculate a transmit power for sidelink transmissions to each other. The indications of the first and second sets of open-loop parameters may be sent in RRC signaling. The open-loop parameter sets in the first set and the corresponding open-loop parameter sets in the second set (e.g., corresponding to the same index) may correspond to transmit powers (e.g., {P0}) used by UE 115 to calculate transmit powers for uplink transmissions and sidelink transmissions, respectively. gNB , P0 SL} and {α gNB , α SL} or {P0 gNB , α gNB} and {P0 SL , α SL In some cases, indications of the first and second sets of open-loop parameters may be sent to UE 115-e and forwarded by UE 115-e to UE 115-f (e.g., if UE 115-f is not within the coverage area of ​​base station 105-c).

[0090] At 410, base station 105-c may send a DCI indicating an open-loop parameter set in a first group for use by UE 115-e and UE 115-f in calculating transmit power for transmissions on the uplink to base station 105-c, or an open-loop parameter set in a second group for use by UE 115-e and UE 115-f in calculating transmit power for transmissions on the sidelink. Specifically, the DCI may include an SRS resource indicator (SRI) indicating which pair of open-loop parameter sets to use. If the SRI is not configured or included in the DCI (e.g., for DCI format 0_0), the first pair in the configuration (i.e., the first pair of open-loop parameter sets in the first group and the second group {P0_0}) may be used. gNB , α gNB} and {P0 SL , α SL}). In some cases, sidelink UE 115-e and UE 115-f (i.e., both UEs) may use the same set of open-loop parameters (e.g., P0 and α values) to perform sidelink communications. In other cases, sidelink UE 115-e and UE 115-f may use different sets of open-loop parameters to perform sidelink communications. For example, the set of open-loop parameters used by UE 115-e may be based on whether UE 115-e is transmitting data or control information. For example, the transmit power used to transmit sidelink data may be greater than the transmit power used to transmit control information (e.g., ,in is configured (for example, ) of RRC).

[0091] At 415, UE 115-e may send a reference signal to UE 115-f, and at 420, UE 115-f may identify the reference signal and perform RSRP measurements on the reference signal. At 425, UE 115-f may then send an RSRP report to UE 115-e. In some cases, UE 115-f may determine a transmit power for sending the RSRP report based on a path loss between UE 115-e and UE 115-f and the set of open-loop parameters indicated at 410. In this case, UE 115-f may receive an indication of the transmit power used by UE 115-e to send the reference signal, and UE 115-f may calculate the path loss based on the transmit power and the RSRP measurement (e.g., the path loss may be equal to a difference between the transmit power and the RSRP measurement). The UE 115-e may receive the RSRP report, and at 430, the UE 115-e may determine a path loss based on the transmit power at which the reference signal was transmitted and the RSRP indicated in the RSRP report (e.g., the path loss may be equal to the difference between the transmit power and the RSRP indicated in the RSRP report). The UE 115-e may then determine a transmit power for subsequent transmissions to the UE 115-f based on the path loss between the UE 115-e and the UE 115-f and the set of open-loop parameters indicated at 410. At 435, the UE 115-e may transmit another side link transmission to the UE 115-f at the determined transmit power.

[0092] In some cases, UE 115-e may receive an open-loop parameter set ({P0 SL , α SL}), rather than using the open-loop parameter set indicated at 410 to determine the transmit power for the sidelink transmission. UE 115-e may use the open-loop parameter set received from UE 115-f to determine the transmit power for the sidelink transmission. Similarly, UE 115-f may receive a desired open-loop parameter set ({P0 SL , α SL}), rather than using the open loop parameter set indicated at 410 to determine the transmit power for sending the RSRP report, and UE 115-f may use the desired open loop parameter set to determine the transmit power for sending the RSRP report. In other cases, UE 115-e and UE 115-f may receive a transmit power command (TPC) indicating a transmit power for sidelink transmission, and UE 115-e and UE 115-f may determine the transmit power for sidelink transmission based on the TPC (e.g., for non-V2X sidelink communications, such as coverage enhancement, where power control parameters may be dynamically set). In some examples, TPC commands may not be supported for V2X sidelink communications because resource pools are associated with transmit power and distributed resource allocation. Additionally or alternatively, handling congestion and resource management between UEs may be challenging.

[0093] Figure 5 A block diagram 500 of a device 505 supporting sidelink power control according to aspects of the present disclosure is shown. The device 505 may be an example of aspects of a UE 115 as described herein. The device 505 may include a receiver 510, a communication manager 515, and a transmitter 520. The device 505 may also include a processor. Each of these components may communicate with each other (e.g., via one or more buses).

[0094] The receiver 510 may receive information such as packets, user data, or control information associated with various information channels (e.g., control channels, data channels, and information related to sidelink power control, etc.). The information may be passed to other components of the device 505. The receiver 510 may be a reference Figure 8 Examples of aspects of the transceiver 820 are described. The receiver 510 may utilize a single antenna or a collection of antennas.

[0095] In some cases, the device 505 may operate as a first (e.g., receiving) UE 115 in a sidelink configuration. The communication manager 515 may receive signaling to support subsequent communication with a second UE via the sidelink, the signaling indicating a set of one or more types of reference signals available for reference signal received power measurement; selecting at least one type of reference signal from the set for performing the reference signal received power measurement; receiving the at least one type of reference signal from the second UE via the sidelink; performing the reference signal received power measurement on the received reference signal; and reporting the reference signal received power measurement.

[0096] In some cases, the device 505 may operate as a second (e.g., transmitting) UE 115 in a sidelink configuration. The communication manager 515 may also identify at least one type of reference signal from a set of one or more types of reference signals to send to a first UE via a sidelink, wherein the at least one type of reference signal will support reference signal received power measurement by the first UE; send to the first UE via the sidelink control information indicating resources on which the at least one type of reference signal will be sent to the first UE; and send to the first UE via the sidelink the at least one type of reference signal on the indicated resources. The communication manager 515 may be an example of aspects of the communication manager 810 as described herein.

[0097] The actions performed by the communication manager 505 as described herein may be implemented to achieve one or more potential advantages. One embodiment may allow a receiving UE to identify a suitable reference signal for performing RSRP measurements and reporting the measurements to a transmitting UE. Thus, the transmitting UE may be able to determine a suitable transmit power for subsequent sidelink transmissions. In addition, a processor at the receiving UE may avoid performing RSRP measurements on all reference signals because the receiving UE may be configured to identify certain reference signals for performing RSRP measurements and reporting the measurements to the transmitting UE. Another embodiment may allow the transmitting UE to limit power consumption because the transmitting UE may be able to determine a suitable transmit power for sidelink transmissions. Another embodiment may allow the receiving UE to identify suitable timing and a suitable channel to report RSRP measurements to prevent interference and improve throughput in a wireless communication system.

[0098] The communication manager 515 or its subcomponents may be implemented in hardware, code executed by a processor (e.g., software or firmware), or any combination thereof. If implemented in code executed by a processor, the functions of the communication manager 515 or its subcomponents may be performed by a general purpose processor, a digital signal processor (DSP), an application specific integrated circuit (ASIC), a field programmable gate array (FPGA) or other programmable logic device, discrete gate or transistor logic, discrete hardware components, or any combination thereof designed to perform the functions described in the present disclosure.

[0099] The communication manager 515 or its subcomponents can be physically located in various locations, including being distributed so that portions of the functionality are implemented by one or more physical components at different physical locations. In some examples, according to various aspects of the present disclosure, the communication manager 515 or its subcomponents can be separate and distinct components. In some examples, according to various aspects of the present disclosure, the communication manager 515 or its subcomponents can be combined with one or more other hardware components, including but not limited to input / output (I / O) components, transceivers, network servers, another computing device, one or more other components disclosed herein, or any combination thereof.

[0100] The transmitter 520 can transmit signals generated by other components of the device 505. In some examples, the transmitter 520 can be collocated with the receiver 510 in a transceiver module. For example, the transmitter 520 can be a reference Figure 8 Examples of various aspects of the transceiver 820 are described. The transmitter 520 may utilize a single antenna or a collection of antennas.

[0101] Figure 6 A block diagram 600 of a device 605 supporting sidelink power control according to aspects of the present disclosure is shown. The device 605 may be an example of aspects of the device 505 or UE 115 as described herein. The device 605 may include a receiver 610, a communication manager 615, and a transmitter 640. The device 605 may also include a processor. Each of these components may communicate with each other (e.g., via one or more buses).

[0102] The receiver 610 may receive information such as packets, user data, or control information associated with various information channels (e.g., control channels, data channels, and information related to sidelink power control, etc.). The information may be passed to other components of the device 605. The receiver 610 may be a reference Figure 8 Examples of aspects of the transceiver 820 are described. The receiver 610 may utilize a single antenna or a group of antennas.

[0103] The communication manager 615 may be an example of aspects of the communication manager 515 as described herein. The communication manager 615 may include a reference signal manager 620, an RSRP measurement manager 625, an RSRP report manager 630, and a control information manager 635. The communication manager 615 may be an example of aspects of the communication manager 810 as described herein.

[0104] In some cases, the device 605 may operate as a first (e.g., receiving) UE 115 in a sidelink configuration. The reference signal manager 620 may receive signaling to support subsequent communication with a second UE via a sidelink, the signaling indicating a set of one or more types of reference signals that may be used for reference signal received power measurement; select at least one type of reference signal from the set for performing the reference signal received power measurement; and receive the at least one type of reference signal from the second UE via the sidelink. The RSRP measurement manager 625 may perform a reference signal received power measurement on the received reference signal. The RSRP reporting manager 630 may report the reference signal received power measurement.

[0105] In some cases, the device 605 may operate as a second (e.g., transmitting) UE 115 in a sidelink configuration. The reference signal manager 620 may identify at least one type of reference signal from a set of one or more types of reference signals to send to a first UE via a sidelink, wherein the at least one type of reference signal will support reference signal received power measurement by the first UE model. The control information manager 635 may send control information to the first UE via the sidelink indicating resources on which the at least one type of reference signal will be sent to the first UE. The reference signal manager 620 may send at least one type of reference signal to the first UE via the sidelink on the indicated resources.

[0106] The transmitter 640 can transmit signals generated by other components of the device 605. In some examples, the transmitter 640 can be collocated with the receiver 610 in a transceiver module. For example, the transmitter 640 can be a reference Figure 8 Examples of various aspects of the transceiver 820 are described. The transmitter 640 may utilize a single antenna or a collection of antennas.

[0107] Figure 7A block diagram 700 of a communication manager 705 supporting sidelink power control in accordance with aspects of the present disclosure is shown. The communication manager 705 may be an example of aspects of the communication manager 515, the communication manager 615, or the communication manager 810 as described herein. The communication manager 705 may include a reference signal manager 710, an RSRP measurement manager 715, an RSRP report manager 720, an RSRP configuration manager 725, a SINR manager 730, an RSRP channel manager 735, a transmit power manager 740, and a control information manager 745. Each of these modules may communicate with each other directly or indirectly (e.g., via one or more buses).

[0108] In some cases, the device 705 may operate as a first (e.g., receiving) UE 115 in a sidelink configuration. The reference signal manager 710 may receive signaling to support components for subsequent communication with a second UE via a sidelink, the signaling indicating a set of one or more types of reference signals that may be used for reference signal received power measurement. In some examples, the reference signal manager 710 may select at least one type of reference signal from the group for performing the reference signal received power measurement. In some examples, the reference signal manager 710 may receive at least one type of reference signal from the second UE via the sidelink. The RSRP measurement manager 715 may perform a reference signal received power measurement on the received reference signal. The RSRP reporting manager 720 may report the reference signal received power measurement.

[0109] The reference signal manager 710 may receive control information indicating a resource on which the at least one type of reference signal is to be received. In some examples, the reference signal manager 710 may select the at least one type of reference signal for performing the reference signal received power measurement based on receiving the control information. In some examples, the resource on which the at least one type of reference signal is to be received includes a non-periodic resource, a semi-persistent resource, or a periodic resource. In some examples, the control information includes downlink control information from a base station or sidelink control information from the second UE.

[0110] In some cases, the set of one or more types of reference signals includes a sounding reference signal (SRS), a demodulation reference signal (DMRS), a sidelink channel state information reference signal (SL-CSI-RS), a sidelink synchronization signal block (SL-SSB), or any combination thereof. The RSRP configuration manager 725 may receive control information indicating that the first UE is to report the reference signal power measurement in response to the received reference signal. In some examples, the RSRP reporting manager 720 may report the reference signal received power measurement based on receiving the control information. In some examples, the control information includes a DCI from a base station or an SCI from the second UE.

[0111] The SINR manager 730 may determine that the signal to interference noise ratio of the received reference signal is above a threshold or below a threshold. In some examples, the RSRP report manager 720 may report the reference signal received power measurement based on the determination. In some examples, the RSRP configuration manager 725 may identify a periodicity for reporting the reference signal received power measurement. In some examples, the RSRP report manager 720 may report the reference signal received power measurement based on the identified periodicity. In some examples, the RSRP configuration manager 725 may identify a periodicity and duration for reporting the reference signal received power measurement. In some examples, the RSRP configuration manager 725 may receive control information for activating reporting of reference signal received power measurement. In some examples, the RSRP report manager 720 may report the reference signal received power measurement based on the identified periodicity and duration.

[0112] The RSRP channel manager 735 may receive control information indicating that the first UE will report the reference signal received power measurement on the PUSCH or PUCCH. In some examples, the RSRP report manager 720 may report the reference signal received power measurement to the base station on the PUSCH or the PUCCH based on receiving the control information. In some examples, the control information includes DCI from the base station. In some examples, the RSRP channel manager 735 may receive control information indicating that the first UE will report the reference signal received power measurement on the PSSCH or PSFCH. In some examples, the RSRP report manager 720 may report the reference signal received power measurement to the second UE on the PSSCH or the PSFCH based on receiving the control information. In some examples, the control information includes SCI from the second UE.

[0113] In some examples, the RSRP channel manager 735 may identify the channel on which the reference signal received power measurement is to be reported based on an indication in the signaling. In some examples, the RSRP report manager 720 may report the reference signal received power measurement on the channel. In some examples, the RSRP channel manager 735 may determine that the first UE is scheduled to report the reference signal received power measurement and send uplink data or UCI to the base station at the same time interval. In some examples, the RSRP report manager 720 may report the reference signal received power measurement to the second UE on the PSSCH or the PSFCH based on the determination. In some examples, the signaling configures a first set of open-loop parameter sets, which are used by the first UE to calculate the transmit power of the transmission to the base station on the uplink, and wherein the signaling configures a second set of open-loop parameter sets, which are used by the first UE to calculate the transmit power of the transmission to the second UE on the sidelink.

[0114] The transmit power manager 740 may receive control information indicating an open-loop parameter set in a first group for the first UE to use to calculate a transmit power for reporting the reference signal received power measurement to the base station on the uplink, or the transmit power manager 740 may receive control information indicating an open-loop parameter set in a second group for the first UE to use to calculate a transmit power for reporting the reference signal received power measurement to the second UE on the side link. In some examples, the transmit power manager 740 may receive an indication of a transmit power used by the second UE to transmit the reference signal. In some examples, the transmit power manager 740 may determine a path loss associated with the side link based on a transmit power used by the second UE to transmit the reference signal and the reference signal received power measurement. In some examples, the transmit power manager 740 may determine a transmit power for reporting the reference signal received power measurement based on the path loss, wherein the report is to the second UE.

[0115] In some examples, the transmit power manager 740 may receive from the second UE an indication of an open-loop parameter set for determining the transmit power for reporting the reference signal received power measurement. In some examples, the transmit power manager 740 may determine the transmit power for reporting the reference signal received power measurement based on the open-loop parameter set. In some examples, the transmit power manager 740 may receive a TPC indicating the transmit power for reporting the reference signal received power measurement. In some examples, the transmit power manager 740 may determine the transmit power for reporting the reference signal received power measurement based on the TPC. In some examples, the signaling indicating a set of one or more types of reference signals that can be used to perform the reference signal received power measurement is higher layer signaling.

[0116] In some cases, the device 705 can operate as a second (e.g., transmitting) UE 115 in a sidelink configuration. In some examples, the reference signal manager 710 can identify at least one type of reference signal from a set of one or more types of reference signals to send to a first UE via a sidelink, wherein the at least one type of reference signal will support reference signal received power measurement by the first UE. The control information manager 745 can send control information to the first UE via the sidelink indicating resources on which the at least one type of reference signal will be sent to the first UE. In some examples, the reference signal manager 710 can send at least one type of reference signal to the first UE via the sidelink on the indicated resources.

[0117] In some examples, the RSRP report manager 720 may receive a reference signal received power measurement from the first UE, the reference signal received power measurement being based on the reference signal. In some examples, the RSRP report manager 720 may forward the reference signal received power measurement to a base station. In some examples, the transmit power manager 740 may determine a transmit power for subsequent transmissions to the first UE via the side link based on the reference signal received power measurement. In some examples, the control information further indicates that the first UE will report the reference signal received power measurement based at least in part on the transmitted reference signal. In some examples, the control information further indicates that the first UE will report the reference signal received power measurement on a PUSCH, PUCCH, PSSCH, or PSFCH.

[0118] In some examples, the reference signal manager 710 may send signaling indicating the set of one or more types of reference signals to the first UE via the side link, wherein the set of one or more types of reference signals corresponds to multiple types of reference signals for which reference signal received power measurement may be performed by the first UE. In some examples, the signaling configures a first set of open-loop parameter sets, which may be used by the first UE to calculate the transmit power of a transmission to a base station on an uplink, and wherein the signaling configures a second set of open-loop parameter sets, which may be used by the first UE to calculate the transmit power of a transmission to the second UE on a side link.

[0119] In some examples, the transmit power manager 740 may send an indication of an open-loop parameter set in the first group to the first UE via the side link, the open-loop parameter set in the first group being used by the first UE to calculate transmit power for reporting the reference signal received power measurement to the base station on the uplink, or the transmit power manager 740 may send an indication of an open-loop parameter set in the second group to the first UE via the side link, the open-loop parameter set in the second group being used by the first UE to calculate transmit power for reporting the reference signal received power measurement to the second UE on the side link. In some examples, the signaling indicating a set of one or more types of reference signals that can be used to perform the reference signal received power measurement is higher layer signaling.

[0120] In some examples, the transmit power manager 740 may send an indication of a transmit power for sending the reference signal to the first UE via the side link. In some examples, the transmit power manager 740 may receive an indication of an open-loop parameter set for determining the transmit power for sending the reference signal from the first UE via the side link. In some examples, the transmit power manager 740 may determine the transmit power for sending the reference signal based on the open-loop parameter set. In some examples, the transmit power manager 740 may receive a TPC indicating a transmit power for sending the reference signal. In some examples, the transmit power manager 740 may determine the transmit power for sending the reference signal based on the TPC.

[0121] Figure 8A diagram of a system 800 including a device 805 supporting sidelink power control according to aspects of the present disclosure is shown. The device 805 may be an example of or include a component of a device 505, device 605, or UE 115 described herein. The device 805 may include components for two-way voice and data communications, including components for sending and receiving communications, including a communication manager 810, an I / O controller 815, a transceiver 820, an antenna 825, a memory 830, and a processor 840. These components may be in electronic communication via one or more buses (e.g., bus 845).

[0122] The communication manager 810 can receive signaling to support subsequent communication with a second UE via a side link, the signaling indicating a set of one or more types of reference signals that can be used for reference signal received power measurement; select at least one type of reference signal from the set for performing the reference signal received power measurement; receive the at least one type of reference signal from the second UE via the side link; perform the reference signal received power measurement on the received reference signal; and report the reference signal received power measurement.

[0123] The communication manager 810 may also identify at least one type of reference signal from a set of one or more types of reference signals to send to the first UE via a side link, wherein the at least one type of reference signal will support reference signal received power measurement performed by the first UE; send the at least one type of reference signal to the second UE on the indicated resources via the side link; and send control information to the second UE via the side link indicating the resources on which the at least one type of reference signal will be sent to the second UE.

[0124] The I / O controller 815 can manage the input and output signals of the device 805. The I / O controller 815 can also manage the peripheral devices that are not integrated into the device 805. In some cases, the I / O controller 815 can represent the physical connection or port to the external peripheral device. In some cases, the I / O controller 815 can utilize an operating system, such as iOS, ANDROID, MS-DOS, MS-WINDOWS, OS / 2, UNIX, LINUX or another known operating system. In other cases, the I / O controller 815 can represent a modem, keyboard, mouse, touch screen or similar device, or interact with these devices. In some cases, the I / O controller 815 can be implemented as a part of a processor. In some cases, the user can interact with the device 805 via the I / O controller 815 or via the hardware components controlled by the I / O controller 815.

[0125] As described above, the transceiver 820 can communicate bidirectionally via one or more antennas, wired links, or wireless links. For example, the transceiver 820 can represent a wireless transceiver and can communicate bidirectionally with another wireless transceiver. The transceiver 820 may also include a modem to modulate packets, provide the modulated packets to an antenna for transmission, and demodulate packets received from an antenna.

[0126] In some cases, the wireless device may include a single antenna 825. However, in some cases, the device may have more than one antenna 825 that is capable of sending or receiving multiple wireless transmissions simultaneously.

[0127] The memory 830 may include random access memory (RAM) and read-only memory (ROM). The memory 830 may store computer-readable, computer-executable code 835 including instructions that, when executed, cause the processor to perform various functions described herein. In some cases, the memory 830 may also include BIOS, etc., which may control basic hardware or software operations, such as interaction with peripheral components or devices.

[0128] The processor 840 may include an intelligent hardware device (e.g., a general purpose processor, a DSP, a central processing unit (CPU), a microcontroller, an ASIC, an FPGA, a programmable logic device, a discrete gate or transistor logic component, a discrete hardware component, or any combination thereof). In some cases, the processor 840 may be configured to operate a memory array using a memory controller. In other cases, the memory controller may be integrated into the processor 840. The processor 840 may be configured to execute computer-readable instructions stored in a memory (e.g., the memory 830) to cause the device 805 to perform various functions (e.g., functions or tasks that support sidelink power control).

[0129] The code 835 may include instructions for implementing various aspects of the present disclosure, including instructions for supporting wireless communications. The code 835 may be stored in a non-transitory computer-readable medium, such as a system memory or other type of memory. In some cases, the code 835 may not be directly executed by the processor 840, but may cause a computer (e.g., when compiled and executed) to perform the functions described herein.

[0130] Fig. 9A block diagram 900 of a device 905 that supports sidelink power control according to aspects of the present disclosure is shown. The device 905 can be an example of aspects of the base station 105 described herein. The device 905 may include a receiver 910, a communication manager 915, and a transmitter 920. The device 905 may also include a processor. Each of these components may communicate with each other (e.g., via one or more buses).

[0131] The receiver 910 may receive information such as packets, user data, or control information associated with various information channels (e.g., control channels, data channels, and information related to sidelink power control, etc.). The information may be delivered to other components of the device 905. The receiver 910 may be a reference Fig.12 Examples of aspects of the transceiver 1220 are described. The receiver 910 may utilize a single antenna or a collection of antennas.

[0132] The communication manager 915 may identify a first UE communicating with a second UE via a side link; identify at least one type of reference signal from a set of one or more types of reference signals for the second UE to send to the first UE, wherein the at least one type of reference signal is to be used by the first UE to perform reference signal received power measurement; and send control information to the first UE and the second UE indicating a resource on which the second UE is to send the at least one type of reference signal to the first UE. The communication manager 915 may be an example of aspects of the communication manager 1210 as described herein.

[0133] The communication manager 915 or its subcomponents may be implemented by hardware, code executed by a processor (e.g., software or firmware), or any combination thereof. If implemented by code executed by a processor, the functions of the communication manager 915 or its subcomponents may be performed by a general purpose processor, DSP, ASIC, FPGA or other programmable logic device designed to perform the functions described in the present disclosure, discrete gate or transistor logic, discrete hardware components, or any combination thereof.

[0134] The communication manager 915 or its subcomponents can be physically located in various locations, including being distributed so that portions of the functionality are implemented by one or more physical components at different physical locations. In some examples, according to various aspects of the present disclosure, the communication manager 915 or its subcomponents can be separate and distinct components. In some examples, according to various aspects of the present disclosure, the communication manager 915 or its subcomponents can be combined with one or more other hardware components, including but not limited to input / output (I / O) components, transceivers, network servers, another computing device, one or more other components described in the present disclosure, or any combination thereof.

[0135] The transmitter 920 can transmit signals generated by other components of the device 905. In some examples, the transmitter 920 can be collocated with the receiver 910 in a transceiver module. For example, the transmitter 920 can be a reference Fig.12 Examples of various aspects of the transceiver 1220 are described. The transmitter 920 can utilize a single antenna or a collection of antennas.

[0136] Fig.10 A block diagram 1000 of a device 1005 supporting sidelink power control according to aspects of the present disclosure is shown. The device 1005 may be an example of aspects of the device 905 or base station 105 described herein. The device 1005 may include a receiver 1010, a communication manager 1015, and a transmitter 1035. The device 1005 may also include a processor. Each of these components may communicate with each other (e.g., via one or more buses).

[0137] The receiver 1010 may receive information such as packets, user data, or control information associated with various information channels (e.g., control channels, data channels, and information related to sidelink power control, etc.). The information may be delivered to other components of the device 1005. The receiver 1010 may be a reference Fig.12 Examples of aspects of the transceiver 1220 are described. The receiver 1010 may utilize a single antenna or a collection of antennas.

[0138] The communication manager 1015 may be an example of aspects of the communication manager 915 as described herein. The communication manager 1015 may include a side link manager 1020, a reference signal manager 1025, and a control information manager 1030. The communication manager 1015 may be an example of aspects of the communication manager 1210 as described herein.

[0139] The sidelink manager 1020 may identify a first UE communicating with a second UE via a sidelink. The reference signal manager 1025 may identify at least one type of reference signal from a set of one or more types of reference signals for the second UE to send to the first UE, wherein the at least one type of reference signal is to be used by the first UE to perform reference signal received power measurement. The control information manager 1030 may send control information to the first UE and the second UE indicating resources on which the second UE is to send the at least one type of reference signal to the first UE.

[0140] The transmitter 1035 can transmit signals generated by other components of the device 1005. In some examples, the transmitter 1035 can be co-located with the receiver 1010 in a transceiver module. For example, the transmitter 1035 can be a reference Fig.12 Examples of various aspects of the transceiver 1220 are described. The transmitter 1035 can utilize a single antenna or a collection of antennas.

[0141] Fig.11 A block diagram 1100 is shown of a communication manager 1105 that supports side link power control in accordance with aspects of the present disclosure. The communication manager 1105 may be an example of aspects of the communication manager 915, the communication manager 1015, or the communication manager 1210 as described herein. The communication manager 1105 may include a side link manager 1110, a reference signal manager 1115, a control information manager 1120, an RSRP report manager 1125, and a transmit power manager 1130. Each of these modules may communicate with each other directly or indirectly (e.g., via one or more buses).

[0142] The sidelink manager 1110 may identify a first UE communicating with a second UE via a sidelink. The reference signal manager 1115 may identify at least one type of reference signal from a set of one or more types of reference signals for the second UE to send to the first UE, wherein the at least one type of reference signal is to be used by the first UE to perform reference signal received power measurement. The control information manager 1120 may send control information to the first UE and the second UE indicating resources on which the second UE is to send the at least one type of reference signal to the first UE.

[0143] The RSRP report manager 1125 may receive a reference signal received power measurement performed by the first UE from the first UE or the second UE. The transmit power manager 1130 may determine the transmit power of the second UE for subsequent transmissions to the first UE via the side link based on the reference signal received power measurement. In some examples, the transmit power manager 1130 may send a TPC indicating the transmit power of the second UE for subsequent transmissions sent to the first UE. In some cases, the signaling indicating the group of one or more types of reference signals that can be used for the reference signal received power measurement of the first UE is higher layer signaling. In some examples, the control information also indicates that the first UE will report the reference signal received power measurement in response to the reference signal. In some examples, the control information also indicates that the first UE will report the reference signal received power measurement on PUSCH, PUCCH, PSSCH, or PSFCH.

[0144] In some examples, the reference signal manager 1115 may send signaling indicating a set of one or more types of reference signals, wherein the set of one or more types of reference signals corresponds to multiple types of reference signals for which reference signal received power measurements may be performed by the first UE. In some cases, the signaling configures a first set of open-loop parameter sets, which are used by the first UE or the second UE to calculate the transmit power of transmissions to the base station on the uplink, and wherein the signaling configures a second set of open-loop parameter sets, which are used by the first UE or the second UE to calculate the transmit power of transmissions through the sidelink.

[0145] In some examples, the transmit power manager 1130 may send an indication of an open-loop parameter set in the first group, where the open-loop parameter set in the first group is used by the first UE to calculate the transmit power for reporting the reference signal receive power measurement to the base station on the uplink, or the transmit power manager 1130 may send an indication of an open-loop parameter set in the second set, where the open-loop parameters in the second set are used by the first UE to calculate the transmit power for reporting the reference signal receive power measurement to the second UE on the side link.

[0146] Fig.12 A diagram of a system 1200 including a device 1205 supporting sidelink power control according to aspects of the present disclosure is shown. The device 1205 may be an example of or include components of the device 905, device 1005, or base station 105 described herein. The device 1205 may include components for two-way voice and data communications, including components for sending and receiving communications, including a communication manager 1210, a network communication manager 1215, a transceiver 1220, an antenna 1225, a memory 1230, a processor 1240, and an inter-station communication manager 1245. These components may be in electronic communication via one or more buses (e.g., bus 1250).

[0147] The communication manager 1210 can identify a first UE that communicates with a second UE via a side link; identify at least one type of reference signal from a set of one or more types of reference signals for the second UE to send to the first UE, wherein the at least one type of reference signal will be used by the first UE to perform reference signal received power measurement; and send control information to the first UE and the second UE indicating the resources on which the second UE will send the at least one type of reference signal to the first UE.

[0148] The network communications manager 1215 may manage communications with the core network (eg, via one or more wired backhaul links). For example, the network communications manager 1215 may manage the delivery of data communications for client devices (eg, one or more UEs 115).

[0149] As described above, the transceiver 1220 can communicate bidirectionally via one or more antennas, wired links, or wireless links. For example, the transceiver 1220 can represent a wireless transceiver and can communicate bidirectionally with another wireless transceiver. The transceiver 1220 may also include a modem to modulate packets, provide the modulated packets to an antenna for transmission, and demodulate packets received from an antenna.

[0150] In some cases, the wireless device may include a single antenna 1225. However, in some cases, the device may have more than one antenna 1225 that is capable of transmitting or receiving multiple wireless transmissions simultaneously.

[0151] The memory 1230 may include RAM, ROM, or any combination thereof. The memory 1230 may store computer readable code 1235, which includes instructions that, when executed by a processor (e.g., processor 1240), cause the device to perform various functions described herein. In some cases, the memory 1230 may also include BIOS, etc., which may control basic hardware or software operations, such as interaction with peripheral components or devices.

[0152] The processor 1240 may include an intelligent hardware device (e.g., a general purpose processor, a DSP, a CPU, a microcontroller, an ASIC, an FPGA, a programmable logic device, a discrete gate or transistor logic component, a discrete hardware component, or any combination thereof). In some cases, the processor 1240 may be configured to operate a memory array using a memory controller. In some cases, the memory controller may be integrated into the processor 1240. The processor 1240 may be configured to execute computer-readable instructions stored in a memory (e.g., memory 1230) to cause the device 1205 to perform various functions (e.g., functions or tasks that support sidelink power control).

[0153] The inter-site communication manager 1245 can manage communications with other base stations 105 and can include a controller or scheduler for controlling communications with UE 115 in collaboration with other base stations 105. For example, the inter-site communication manager 1245 can coordinate the scheduling of transmissions to UE 115 for various interference mitigation techniques such as beamforming or joint transmission. In some examples, the inter-site communication manager 1245 can provide an X2 interface within an LTE / LTE-A wireless communication network technology to provide communications between base stations 105.

[0154] The code 1235 may include instructions for implementing various aspects of the present disclosure, including instructions for supporting wireless communications. The code 1235 may be stored in a non-transitory computer-readable medium, such as a system memory or other type of memory. In some cases, the code 1235 may not be directly executed by the processor 1240, but may cause a computer (e.g., when compiled and executed) to perform the functions described herein.

[0155] Fig.13 1 is a flowchart illustrating a method 1300 for supporting side link power control according to aspects of the present disclosure. The operations of the method 1300 may be implemented by the UE 115 or a component thereof, as described herein. For example, the operations of the method 1300 may be implemented by reference to Figures 5 to 8 In some examples, the UE may execute a set of instructions to control the functional elements of the UE to perform the functions described below. Additionally or alternatively, the UE may use dedicated hardware to perform various aspects of the functions described below.

[0156] At 1305, the UE may receive signaling to support subsequent communication with a second UE via a sidelink, the signaling indicating a set of one or more types of reference signals that may be used for reference signal received power measurement. The operations of 1305 may be performed according to the methods described herein. In some examples, aspects of the operations of 1305 may be performed by reference Figures 5 to 8 The described reference signal manager is implemented.

[0157] At 1310, the UE may select at least one type of reference signal from the set for performing reference signal received power measurement. The operations of 1310 may be performed according to the methods described herein. In some examples, aspects of the operations of 1310 may be performed by reference signal receiving power measurement. Figures 5 to 8 The described reference signal manager is implemented.

[0158] At 1315, the UE may receive at least one type of reference signal from a second UE via a sidelink. The operations of 1315 may be performed according to the methods described herein. In some examples, aspects of the operations of 1315 may be performed by a reference signal. Figures 5 to 8 The described reference signal manager is implemented.

[0159] At 1320, the UE may perform reference signal received power measurements on the received reference signal. The operations of 1320 may be performed according to the methods described herein. In some examples, aspects of the operations of 1320 may be performed by reference Figures 5 to 8 The RSRP measurement manager described herein is used to perform the above operations.

[0160] At 1325, the UE may report the reference signal received power measurement. The operations of 1325 may be performed according to the methods described herein. In some examples, aspects of the operations of 1325 may be performed by reference Figures 5 to 8 The RSRP reporting manager described herein is used to perform the above operations.

[0161] Fig.14 1 is a flowchart illustrating a method 1400 for supporting side link power control according to aspects of the present disclosure. The operations of the method 1400 may be implemented by a UE 115 or a component thereof as described herein. For example, the operations of the method 1400 may be implemented by a UE 115 or a component thereof as described herein. Figures 5 to 8 In some examples, the UE may execute a set of instructions to control the functional elements of the UE to perform the functions described below. Additionally or alternatively, the UE may use dedicated hardware to perform various aspects of the functions described below.

[0162] At 1405, the UE may identify at least one type of reference signal from a set of one or more types of reference signals to send to the first UE via a sidelink, wherein the at least one type of reference signal will support reference signal received power measurement by the first UE. The operations of 1405 may be performed according to the methods described herein. In some examples, aspects of the operations of 1405 may be performed by reference to Figures 5 to 8 The described reference signal manager is implemented.

[0163] At 1410, the UE may send control information to the first UE via a sidelink indicating resources on which at least one type of reference signal is to be sent to the first UE. The operations of 1410 may be performed according to the methods described herein. In some examples, aspects of the operations of 1410 may be performed by reference to Figures 5 to 8 The described control information manager is executed.

[0164] At 1415, the UE may send at least one type of reference signal to the first UE via a sidelink on the indicated resources. The operations of 1415 may be performed according to the methods described herein. In some examples, aspects of the operations of 1415 may be performed by reference to Figures 5 to 8 The described reference signal manager is implemented.

[0165] Fig.15 1 is a flowchart illustrating a method 1500 for supporting side link power control according to aspects of the present disclosure. The operations of the method 1500 may be implemented by the base station 105 or components thereof as described herein. For example, the operations of the method 1500 may be implemented by reference to Figures 9 to 12 In some examples, the base station may execute a set of instructions to control the functional elements of the base station to perform the functions described below. Additionally or alternatively, the base station may use dedicated hardware to perform various aspects of the functions described below.

[0166] At 1505, the base station may identify a first UE that is communicating with a second UE via a side link. The operations of 1505 may be performed according to the methods described herein. In some examples, aspects of the operations of 1505 may be described with reference to Figures 9 to 12 The side link manager described is used to perform.

[0167] At 1510, the base station may identify at least one type of reference signal from a set of one or more types of reference signals for the second UE to send to the first UE, wherein the at least one type of reference signal is to be used by the first UE to perform reference signal received power measurement. The operations of 1510 may be performed according to the methods described herein. In some examples, aspects of the operations of 1510 may be performed by reference Figures 9 to 12 The described reference signal manager is implemented.

[0168] At 1515, the base station may send control information to the first UE and the second UE indicating resources on which the second UE will send at least one type of reference signal to the first UE. The operations of 1515 may be performed according to the methods described herein. In some examples, aspects of the operations of 1515 may be performed by reference to Figures 9 to 12 The described control information manager is executed.

[0169] It should be noted that the methods described herein describe possible implementations, and that operations and steps may be rearranged or otherwise modified, and other implementations are possible. Furthermore, aspects from two or more methods may be combined.

[0170] The techniques described herein can be used in various wireless communication systems, such as code division multiple access (CDMA), time division multiple access (TDMA), frequency division multiple access (FDMA), orthogonal frequency division multiple access (OFDMA), single carrier frequency division multiple access (SC-FDMA), and other systems. A CDMA system can implement radio technologies such as CDMA2000, Universal Terrestrial Radio Access (UTRA), etc. CDMA2000 covers IS-2000, IS-95, and IS-856 standards. IS-2000 Releases are commonly referred to as CDMA2000 1X, 1X, etc. IS-856 (TIA-856) is commonly referred to as CDMA2000 1xEV-DO, High Rate Packet Data (HRPD), etc. UTRA includes Wideband CDMA (WCDMA) and other variants of CDMA. A TDMA system can implement radio technologies such as Global System for Mobile Communications (GSM).

[0171] An OFDMA system may implement a radio technology such as Ultra Mobile Broadband (UMB), Evolved UTRA (E-UTRA), Institute of Electrical and Electronics Engineers (IEEE) 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802.20, Flash-OFDM, etc. UTRA and E-UTRA are part of the Universal Mobile Telecommunications System (UMTS). LTE, LTE-A, and LTE-A Pro are versions of UMTS that use E-UTRA. UTRA, E-UTRA, UMTS, LTE, LTE-A, LTE-A Pro, NR, and GSM are described in documents from an organization named "3rd Generation Partnership Project" (3GPP). CDMA2000 and UMB are described in documents from an organization named "3rd Generation Partnership Project 2" (3GPP2). The techniques described herein may be used for the systems and radio technologies mentioned herein as well as other systems and radio technologies. Although various aspects of LTE, LTE-A, LTE-A Pro, or NR systems may be described for example purposes, and LTE, LTE-A, LTE-A Pro, or NR terminology may be used in many of the descriptions, the techniques described herein may be applicable beyond LTE, LTE-A, LTE-A Pro, or NR applications.

[0172] A macro cell typically covers a relatively large geographic area (e.g., a radius of several kilometers) and may allow unrestricted access to UEs with service subscriptions to a network provider. Small cells may be associated with lower-power base stations than macro cells, and small cells may operate in the same or different frequency bands (e.g., licensed, unlicensed, etc.) as macro cells. According to various examples, small cells may include pico cells, femto cells, and micro cells. A pico cell, for example, may cover a smaller geographic area and may allow unrestricted access to UEs with service subscriptions to a network provider. A femto cell may also cover a smaller geographic area (e.g., a home) and may provide restricted access to UEs associated with the femto cell (e.g., UEs in a closed subscriber group (CSG), UEs of users in a home, etc.). An eNB for a macro cell may be referred to as a macro eNB. An eNB for a small cell may be referred to as a small cell eNB, a pico eNB, a femto eNB, or a home eNB. An eNB may support one or more (e.g., two, three, four, etc.) cells and may also support communications using one or more component carriers.

[0173] The wireless communication systems described herein may support synchronous or asynchronous operation. For synchronous operation, the base stations may have similar frame timing, and transmissions from different base stations may be approximately aligned in time. For asynchronous operation, the base stations may have different frame timing, and transmissions from different base stations may not be aligned in time. The techniques described herein may be used for synchronous or asynchronous operation.

[0174] The information and signals described herein may be represented using any of a variety of different technologies and techniques. For example, data, instructions, commands, information, signals, bits, symbols, and chips that may be referenced throughout the specification may be represented by voltages, currents, electromagnetic waves, magnetic fields or particles, optical fields or particles, or any combination thereof.

[0175] The various illustrative blocks and modules described in conjunction with the disclosure herein may be implemented or executed using a general purpose processor, a DSP, an ASIC, an FPGA or other programmable logic device, discrete gate or transistor logic, discrete hardware components, or any combination thereof, designed to perform the functions described herein. A general purpose processor may be a microprocessor, but alternatively, the processor may be any conventional processor, controller, microcontroller, or state machine. The processor may also be implemented as any combination of computing devices (e.g., any combination of a DSP and a microprocessor, multiple microprocessors, one or more microprocessors combined with a DSP core, or any other such configuration).

[0176] The functions described herein may be implemented by hardware, software executed by a processor, firmware, or any combination thereof. If implemented in software executed by a processor, the functions may be stored as one or more instructions or codes on or sent via a computer-readable medium. Other examples and implementations are within the scope of the present disclosure and the appended claims. For example, due to the nature of software, the functions described herein may be implemented using software executed by a processor, hardware, firmware, hard wiring, or any combination thereof. Features that implement the functions may also be physically located in various locations, including being distributed so that parts of the functions are implemented at different physical locations.

[0177] Computer-readable media include non-transitory computer storage media and communication media, and communication media include any media that helps to transfer a computer program from one place to another. Non-transitory storage media can be any available media that can be accessed by a general or special computer. As an example and not limitation, non-transitory computer-readable media can include RAM, ROM, electrically erasable programmable ROM (EEPROM), flash memory, compact disk (CD) ROM or other optical disk storage, disk storage or other magnetic storage devices, or any other non-transitory media that can be used to carry or store the required program code in the form of instructions or data structures and can be accessed by a general or special computer or a general or special processor. Moreover, any connection is appropriately referred to as a computer-readable medium. For example, if a coaxial cable, optical cable, twisted pair, digital subscriber line (DSL) or wireless technologies such as infrared, radio and microwaves are used to send software from a website, server or other remote source, then coaxial cable, optical fiber cable, twisted pair, DSL or wireless technologies such as infrared, radio and microwaves are included in the definition of medium. Disk and disc, as used herein, includes CD, laser disc, optical disc, digital versatile disc (DVD), floppy disk and Blu-ray disc where disks usually reproduce data magnetically, while discs reproduce data optically with lasers. Combinations of the above are also included within the scope of computer-readable media.

[0178] As used herein, including in the claims, "or" used in a list of items (e.g., a list of items beginning with a phrase such as "at least one" or "one or more") means an inclusive list. Thus, for example, a list of at least one of A, B, or C means A or B or C or AB or AC or BC or ABC (i.e., A and B and C). Moreover, as used herein, the phrase "based on" should not be interpreted as a reference to a closed set of conditions. For example, an exemplary step described as "based on condition A" can be based on both condition A and condition B without departing from the scope of this disclosure. In other words, as used herein, the phrase "based on" should be interpreted in the same manner as the phrase "based at least in part on."

[0179] In the drawings, similar parts or features may have the same reference label. In addition, various components of the same type may be distinguished by following the reference label with a dash and a second label that is used to distinguish between other similar components. If only the first reference label is used in the description, the description applies to any similar components having the same first reference label, regardless of the second or other subsequent reference labels.

[0180] The description described herein, in conjunction with the accompanying drawings, describes example configurations and does not represent all examples that may be implemented or within the scope of the claims. The term "exemplary" as used herein means "used as an example, instance, or illustration," rather than "preferred" or "superior to other examples." In order to provide an understanding of the described techniques, the detailed description includes specific details. However, these techniques may be practiced without these specific details. In some instances, well-known structures and devices are shown in block diagram form to avoid making the concepts of the described examples unclear.

[0181] The descriptions described herein are provided to enable those skilled in the art to make or use the present disclosure. Various modifications to the present disclosure will be apparent to those skilled in the art, and the general principles defined herein may be applied to other variations without departing from the scope of the present disclosure. Therefore, the present disclosure is not limited to the examples and designs described herein, but should be given the broadest scope consistent with the principles and novel features disclosed herein.

Claims

1. A first user equipment (UE), comprising: one or more memories storing processor-executable code; and One or more processors, which are coupled to the one or more memories and can operate individually or together to execute the code so that the first UE: receiving signaling to support subsequent communication with a second UE over a sidelink, wherein the signaling includes first configuration information of a first set of open-loop parameters usable by the second UE to calculate transmit power based at least in part on a downlink path loss between a network node and the first UE, and wherein the signaling includes second configuration information of a second set of open-loop parameters usable by the second UE to calculate transmit power based at least in part on a sidelink path loss between the second UE and the first UE; receiving a reference signal from the second UE via the sidelink; obtaining a reference signal received power measurement based at least in part on the received reference signal; sending a report indicating the reference signal received power measurement; and A sidelink transmission is received from the second UE, wherein the sidelink transmission is associated with a transmit power based at least in part on the reference signal received power measurement and the first set of open-loop parameters, the second set of open-loop parameters, or any combination thereof.

2. The first UE according to claim 1, wherein: The one or more processors may also individually or collectively operate to execute the code so that the first UE: Control signaling is received indicating that the first UE is to report the reference signal received power measurement, wherein the one or more processors are operable individually or collectively to execute the code to cause the first UE to send the report in response to the control signaling.

3. The first UE according to claim 2, wherein: The control signaling indicating that the first UE is to report the reference signal received power measurement includes downlink control information from a network entity or sidelink control information from the second UE.

4. The first UE according to claim 1, wherein: The one or more processors may also individually or collectively operate to execute the code so that the first UE: The report is sent based at least in part on a signal to interference plus noise ratio of the received reference signal being above a threshold or below a threshold.

5. The first UE according to claim 1, wherein: The one or more processors may also individually or collectively operate to execute the code so that the first UE: receiving control signaling indicating activation of reporting of reference signal received power measurements; as well as The report is sent based at least in part on the indicated activation.

6. The first UE according to claim 1, wherein: The one or more processors may also individually or collectively operate to execute the code so that the first UE: receiving control signaling indicating that the UE is to report reference signal received power measurements on a periodic basis; as well as The report is sent based at least in part on the periodic basis.

7. The first UE according to claim 1, wherein: The one or more processors may also individually or collectively operate to execute the code so that the first UE: Control information is received indicating resources on which the reference signal is to be received, wherein performing the reference signal received power measurement is based at least in part on receiving the control information.

8. The first UE according to claim 7, wherein: The control information includes downlink control information from a network entity or sidelink control information from the second UE.

9. A second user equipment (UE), comprising: one or more memories storing processor-executable code; and One or more processors coupled with the one or more memories and individually or collectively operable to execute the code so that the second UE: receiving signaling to support subsequent communication with a first UE over a sidelink, wherein the signaling includes first configuration information of a first set of open-loop parameters usable by the second UE to calculate transmit power based at least in part on a downlink path loss between a network node and the first UE, and wherein the signaling includes second configuration information of a second set of open-loop parameters usable by the second UE to calculate transmit power based at least in part on a sidelink path loss between the second UE and the first UE; Sending a reference signal to the first UE via the sidelink; receiving a report indicating a reference signal received power measurement based at least in part on the reference signal; and A sidelink transmission is sent to the first UE using a transmit power based at least in part on the reference signal received power measurement and the first set of open-loop parameters, the second set of open-loop parameters, or any combination thereof.

10. The second UE according to claim 9, wherein: The one or more processors may also individually or collectively operate to execute the code so that the second UE: sending control signaling indicating that the first UE is to report the reference signal received power measurement; as well as The reporting is monitored based at least in part on the control signaling.

11. The second UE according to claim 10, wherein: The control signaling indicating that the first UE is to report the reference signal received power measurement includes sidelink control information.

12. The second UE according to claim 9, wherein: The one or more processors may also individually or collectively operate to execute the code so that the second UE: The reporting is monitored based at least in part on sending the reference signal to the first UE.

13. The second UE according to claim 9, wherein: The one or more processors may also individually or collectively operate to execute the code so that the second UE: sending control signaling indicating activation of reporting of reference signal received power measurement; as well as The reporting is monitored based at least in part on the indicated activation.

14. The second UE according to claim 9, wherein: The one or more processors may also individually or collectively operate to execute the code so that the second UE: sending control signaling indicating that the UE is to report reference signal received power measurements on a periodic basis; as well as The reports are monitored based at least in part on the periodic basis.

15. The second UE according to claim 9, wherein: The one or more processors may also individually or collectively operate to execute the code so that the second UE: Control information indicating resources on which the reference signal is to be sent is sent to the first UE.

16. The second UE according to claim 15, wherein: The control information includes sidelink control information.

17. A method for wireless communication at a second user equipment (UE), comprising: receiving signaling to support subsequent communication with a first UE on a sidelink, wherein the signaling includes first configuration information of a first set of open-loop parameters usable by the second UE to calculate transmit power based at least in part on a downlink path loss between a network node and the first UE, and wherein the signaling includes second configuration information of a second set of open-loop parameters usable by the second UE to calculate transmit power based at least in part on a sidelink path loss between the second UE and the first UE; Sending a reference signal to the first UE via the sidelink; receiving a report indicating a reference signal received power measurement, the reference signal received power measurement being based at least in part on a reference signal; and A sidelink transmission is sent to the first UE using a transmit power based at least in part on the reference signal received power measurement and the first set of open-loop parameters, the second set of open-loop parameters, or any combination thereof.

18. The method according to claim 17, further comprising: sending control signaling indicating that the first UE is to report the reference signal received power measurement; as well as The reporting is monitored based at least in part on the control signaling.

19. The method according to claim 18, wherein: The control signaling indicating that the first UE is to report the reference signal received power measurement includes sidelink control information.

20. The method of claim 17, further comprising: The reporting is monitored based at least in part on sending the reference signal to the first UE.

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