Default path loss reference signal for multi-panel uplink transmission

Abstract

Methods, systems, and devices for wireless communications are described herein. A user equipment (UE) may identify a corresponding TRP index value corresponding to a first transmit / receive point (TRP) and a second TRP, wherein the UE may be configured at least for a first transmission of an uplink signal to the first TRP using a first antenna panel and a second transmission of an uplink signal to the second TRP using a second antenna panel. The UE may determine a default PLRS resource for one or more path loss reference signal (PLRS) resources associated with the first transmission and the second transmission of the uplink signal. In some cases, the default PLRS resource may be determined based on whether the UE is configured with the PLRS, the corresponding TRP index value, and a resource selection rule. The UE may use the default PLRS resource to send one or more PLRS.

Description

Technical Field

[0001] The following relates to wireless communications, including a default path loss reference signal for multi-panel uplink transmissions. Background Art

[0002] Wireless communication systems are widely deployed to provide various types of communication content, such as voice, video, packet data, messaging, broadcast, etc. These systems may be able to support 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, which are referred to 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).

[0003] A wireless multiple access communication system may include one or more base stations or one or more network access nodes, each of which simultaneously supports communication for multiple communication devices, which may be referred to as user equipment (UE). The UE may send a reference signal to the base station. However, in some cases, the UE may not know the reference signal resource used for the reference signal. Summary of the invention

[0004] The described techniques relate to improved methods, systems, devices, and apparatuses for supporting default path loss reference signals for multi-panel uplink transmissions. In general, the described techniques provide for reducing signaling overhead and default resource selection schemes for default path loss reference signal (PLRS) transmissions, including determining default PLRS resources for multiple transmit / receive point (TRP) transmissions. In some examples, a user equipment (UE) may use a first antenna panel to make a first transmission to a first TRP and use a second antenna panel to send a second transmission to a second different TRP. The UE may determine a default PLRS resource set of one or more PLRS associated with a first transmission and a second transmission of an uplink signal (e.g., data on a physical uplink shared channel (PUSCH), control information on a physical uplink control channel (PUCCH), a sounding reference signal (SRS), or the like), wherein the default PLRS resources may be determined based on a TRP index, whether the UE is configured with PLRS resources, and one or more rules. For example, the UE may identify corresponding TRP index values ​​corresponding to a first TRP and a second TRP, wherein the UE is at least configured (e.g., via one or more downlink control information (DCI)) for a first transmission of an uplink signal to the first TRP using a first antenna panel and a second transmission of an uplink signal to the second TRP using a second antenna panel. That is, a multi-panel transmission by the UE may include uplink transmissions to two or more TRPs using corresponding antenna panels (e.g., antenna arrays) at the UE. The UE may determine a default PLRS resource for one or more PLRS associated with the first transmission and the second transmission of the uplink signal. In this case, the UE may determine whether the PLRS is configured, and if so, whether additional signaling or configuration indicates which PLRS resources to use. The UE may further identify a corresponding TRP index value for the TRP receiving the uplink transmission, and the UE may use a resource selection rule for selecting a default PLRS resource, wherein the resource selection rule may be based on various configurations or parameters available to the UE for selecting the default PLRS resource. The UE may use the default PLRS resource to send one or more PLRS.

[0005] A method of wireless communication at a UE is described. The method may include identifying respective TRP index values ​​corresponding to a first TRP and a second TRP, wherein the UE is configured to at least send a first transmission of an uplink signal to the first TRP using a first antenna panel and send a second transmission of the uplink signal to the second TRP using a second antenna panel different from the first antenna panel, determining a default PLRS resource for one or more PLRSs associated with the first transmission and the second transmission of the uplink signal, the default PLRS resource being based on a determination of whether PLRS is configured, the respective TRP index value, and a resource selection rule, and sending the one or more PLRSs using the default PLRS resource.

[0006] An apparatus for wireless communication at a UE is described. The apparatus may include a processor, a memory coupled to the processor, and instructions stored in the memory. The instructions are executable by the processor to cause the apparatus to identify corresponding TRP index values ​​corresponding to a first TRP and a second TRP, wherein the UE is configured to at least send a first transmission of an uplink signal to the first TRP using a first antenna panel and send a second transmission of an uplink signal to the second TRP using a second antenna panel different from the first antenna panel, determine a default PLRS resource of one or more PLRS associated with the first transmission and the second transmission of the uplink signal, the default PLRS resource is based on a determination of whether PLRS is configured, the corresponding TRP index value, and a resource selection rule, and use the default PLRS resource to send the one or more PLRS.

[0007] Another apparatus for wireless communication at a UE is described. The apparatus may include components for identifying respective TRP index values ​​corresponding to a first TRP and a second TRP, wherein the UE is configured to at least send a first transmission of an uplink signal to the first TRP using a first antenna panel and send a second transmission of the uplink signal to the second TRP using a second antenna panel different from the first antenna panel, determine a default PLRS resource for one or more PLRS associated with the first transmission and the second transmission of the uplink signal, the default PLRS resource being based on a determination of whether PLRS is configured, the respective TRP index value, and a resource selection rule, and send the one or more PLRS using the default PLRS resource.

[0008] A non-transitory computer-readable medium storing code for wireless communication at a UE is described. The code may include instructions executable by a processor to identify corresponding TRP index values ​​corresponding to a first TRP and a second TRP, wherein the UE is configured to at least send a first transmission of an uplink signal to the first TRP using a first antenna panel and send a second transmission of the uplink signal to the second TRP using a second antenna panel different from the first antenna panel, determine a default PLRS resource for one or more PLRS associated with the first transmission and the second transmission of the uplink signal, the default PLRS resource being based on a determination of whether PLRS is configured, the corresponding TRP index value, and a resource selection rule, and send the one or more PLRS using the default PLRS resource.

[0009] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, determining a default PLRS resource may include operations, features, components, or instructions for determining that the PLRS can be configured via radio resource control signaling, determining that downlink control information or additional radio resource control signaling associated with a corresponding TRP index value excludes configuration information for sending one or more default PLRSs, and based on the PLRS being configured and the configuration information being excluded, selecting a default PLRS resource according to a resource selection rule and a corresponding TRP index value.

[0010] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, selecting a default PLRS resource based on a resource selection rule may include operations, features, components, or instructions for: identifying a PLRS identifier value associated with a corresponding TRP index value, and selecting a default PLRS resource based on the PLRS identifier value, wherein the selected default PLRS resource includes resources of a serving cell.

[0011] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, each PLRS identifier value comprises a lowest PLRS identifier associated with a corresponding TRP index value.

[0012] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, selecting a default PLRS resource based on a resource selection rule may include operations, features, components, or instructions for: identifying a set of control resource sets for monitoring downlink control information, identifying a control resource set from a set of control resource sets having a control resource set pool index value associated with a corresponding TRP index value, and selecting a default PLRS resource based on the control resource set pool index value, wherein the default PLRS resource includes a periodic resource, which can be selected based on a spatial quasi-co-location relationship associated with the identified control resource set.

[0013] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, a control resource set having a control resource set pool index value associated with a corresponding TRP index value may be located in an active downlink portion of a scheduling cell.

[0014] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, a control resource set having a control resource set pool index value associated with a corresponding TRP index value may be located in an active downlink portion of a primary cell, and wherein the configuration information excluded from the downlink control information includes spatial beam information regarding an active uplink bandwidth portion of the primary cell.

[0015] Some examples of the methods, apparatus, and non-transitory computer-readable media described herein may also include operations, features, components, or instructions for determining that configuration information excluded from downlink control information includes a sounding reference signal resource indicator field associated with a corresponding TRP index value, wherein selecting a default PLRS resource according to the resource selection rule includes: identifying a mapping between a power control identifier value and a PLRS identifier value associated with the corresponding TRP index value, and selecting the default PLRS resource based at least in part on the PLRS identifier value and according to the mapping.

[0016] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, the downlink control information may be part of a multiple downlink control information scheme for scheduling a first transmission and a second transmission of an uplink signal.

[0017] Some examples of the methods, apparatus, and non-transitory computer-readable media described herein may also include operations, features, components, or instructions for determining the format of configuration information excluded from additional radio resource control signaling, including uplink configuration authorization parameters, downlink control information for activating a first transmission and a second transmission of an uplink signal, wherein selecting the default PLRS resource according to a resource selection rule includes: identifying a mapping between a sounding reference signal resource indicator field associated with a corresponding TRP index value and a PLRS indicator value, and selecting the default PLRS resource based at least in part on the PLRS identifier value and according to the mapping, wherein the selected default PLRS resource includes resources of a serving cell.

[0018] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, the downlink control information may be part of a single downlink control information scheme for scheduling a first transmission and a second transmission of an uplink signal.

[0019] Some examples of the methods, apparatus, and non-transitory computer-readable media described herein may also include operations, features, apparatus, or instructions for determining that configuration information excluded from additional radio resource control signaling includes one or more configuration authorization parameters, a format of downlink control information that activates a first transmission and a second transmission of an uplink signal, wherein selecting a default PLRS resource according to a resource selection rule includes: identifying a PLRS identifier value associated with a corresponding TRP index value, and selecting a default PLRS resource based at least in part on the PLRS identifier value, wherein the selected default PLRS resource includes resources of a serving cell.

[0020] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, the downlink control information may be part of a single downlink control information scheme for scheduling a first transmission and a second transmission of an uplink signal.

[0021] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, determining a default PLRS resource may include operations, features, components, or instructions for determining that the PLRS may not be configured via radio resource control signaling, determining that downlink control information excludes configuration information for sending one or more default PLRSs, the configuration information including a sounding reference signal resource indicator field, and selecting a default PLRS resource according to a resource selection rule and a corresponding TRP index value based on the PLRS not being configured and the configuration information being excluded.

[0022] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, selecting a default PLRS resource based on a resource selection rule may include operations, features, components, or instructions for: identifying a set of control resource sets for monitoring downlink control information, wherein the downlink control information may be part of a multi-downlink control information scheme for scheduling a first transmission and a second transmission of an uplink signal, identifying a control resource set from a set of control resource sets having a control resource set pool index value associated with a corresponding TRP index value, wherein the identified control resource set may be within an active downlink bandwidth portion, and selecting a default PLRS resource based on the control resource set pool index value, wherein the default PLRS resource includes a periodic resource, which may be selected based on a spatial quasi-co-location relationship associated with the identified control resource set.

[0023] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, selecting a default PLRS resource based on a resource selection rule may include operations, features, components, or instructions for: identifying a set of transmission configuration indicator states for a physical downlink shared channel, wherein the downlink control information may be part of a multi-downlink control information scheme for scheduling a first transmission and a second transmission of an uplink signal, identifying a transmission configuration identifier associated with a corresponding TRP index value from the set of transmission configuration indicator states, and selecting a default PLRS resource based on the transmission configuration identifier, wherein the set of control resources associated with the corresponding TRP index value may be in a downlink bandwidth portion that is different from an active downlink bandwidth portion.

[0024] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, selecting a default PLRS resource based on a resource selection rule may include operations, features, components, or instructions for: identifying a set of transmission configuration indicator states for a physical downlink shared channel, wherein the downlink control information may be part of a single downlink control information scheme for scheduling a first transmission and a second transmission of an uplink signal, identifying a transmission configuration identifier associated with a corresponding TRP index value from the set of transmission configuration indicator states, wherein each transmission configuration identifier may be within a transmission configuration indicator code point of a pair of transmission configuration indicator states, and selecting a default PLRS resource based on the transmission configuration identifier, wherein the set of control resources associated with the corresponding TRP index value may be in a downlink bandwidth portion that is different from an active downlink bandwidth portion.

[0025] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, the transmission configuration identifier may have a lowest value of the transmission configuration indicator code points of the pair of transmission configuration indicator states.

[0026] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, selecting a default PLRS resource based on a resource selection rule may include operations, features, components, or instructions for: identifying a set of control resource sets for monitoring downlink control information, wherein the downlink control information may be part of a single downlink control information scheme for scheduling a first transmission and a second transmission of an uplink signal, identifying a control resource set from a set of control resource sets having a control resource set pool index value associated with a corresponding TRP index value, wherein the identified control resource set may be within an active downlink bandwidth portion, and selecting a default PLRS resource based on the control resource set pool index value, wherein the default PLRS resource includes a periodic resource, which may be selected based on a spatial quasi-co-location relationship associated with the identified control resource set.

[0027] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, determining a default PLRS resource may include operations, features, components, or instructions for: determining that the PLRS may be configured via radio resource control signaling, determining that additional radio resource control signaling associated with a corresponding TRP index value excludes configuration information for sending one or more default PLRSs, the configuration information including spatial relationship information, and based on the PLRS being configured and the configuration information being excluded, selecting a default PLRS resource according to a resource selection rule and a corresponding TRP index value, wherein selecting the default PLRS resource according to the resource selection rule includes: identifying a PLRS identifier value associated with the corresponding TRP index value, and selecting the default PLRS resource based at least in part on the PLRS identifier value, wherein the selected default PLRS resource includes resources of a serving cell.

[0028] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, determining a default PLRS resource may include operations, features, components, or instructions for: determining that the PLRS may not be configured via radio resource control signaling, determining that additional radio resource control signaling associated with a corresponding TRP index value excludes configuration information for sending one or more default PLRSs, the configuration information including spatial relationship information, and based on the PLRS not being configured and the configuration information being excluded, selecting a default PLRS resource according to a resource selection rule and a corresponding TRP index value, wherein selecting the default PLRS resource according to the resource selection rule includes: identifying multiple control resource sets for monitoring downlink control information, identifying a control resource set from a group of control resource sets having a control resource set pool index value associated with the corresponding TRP index value, and selecting a default PLRS resource based on the control resource set pool index value, wherein the default PLRS resource includes a periodic resource, which may be selected based on a spatial quasi-co-location relationship associated with the identified control resource set.

[0029] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, determining a default PLRS resource may include operations, features, components, or instructions for: determining that the PLRS may not be configured via radio resource control signaling, determining that additional radio resource control signaling associated with a corresponding TRP index value excludes configuration information for sending one or more default PLRSs, the configuration information being used for a sounding reference signal associated with the corresponding TRP index value, and based on the PLRS not being configured and the configuration information being excluded, selecting a default PLRS resource according to a resource selection rule and the corresponding TRP index value, wherein selecting the default PLRS resource according to the resource selection rule includes: identifying a synchronization signal block used to receive a master information block associated with the corresponding TRP index value, and selecting the default PLRS resource based at least in part on the identified synchronization signal block.

[0030] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, determining a default PLRS resource may include operations, features, components, or instructions for: determining that one or more higher layer parameters are not received at the UE, and based on the one or more higher layer parameters not being received, selecting a default PLRS resource according to a resource selection rule and a corresponding TRP index value, wherein selecting the default PLRS resource according to the resource selection rule includes: identifying a synchronization signal block used to receive a master information block associated with the corresponding TRP index value, and selecting the default PLRS resource based at least in part on the identified synchronization signal block.

[0031] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, determining a default PLRS resource may include operations, features, components, or instructions for determining that the PLRS may not be configured via radio resource control signaling, determining that additional radio resource control signaling associated with a corresponding TRP index value excludes configuration information for sending one or more default PLRSs, the configuration information being used for a sounding reference signal associated with the corresponding TRP index value, and selecting a default PLRS resource according to a resource selection rule and the corresponding TRP index value based on the PLRS not being configured and the configuration information being excluded.

[0032] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, selecting a default PLRS resource based on a resource selection rule may include operations, features, components, or instructions for: identifying a set of control resource sets for monitoring downlink control information, identifying a control resource set from a set of control resource sets having a lowest control resource set pool index value associated with a corresponding TRP index value, wherein the identified control resource set may be within an active downlink bandwidth portion, and selecting a default PLRS resource based on the lowest control resource set pool index value, wherein the default PLRS resource includes a periodic resource, which may be selected based on a spatial quasi-co-location relationship associated with the identified control resource set.

[0033] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, selecting a default PLRS resource based on a resource selection rule may include operations, features, components, or instructions for identifying a set of transmission configuration indicator states for a physical downlink shared channel, identifying a transmission configuration identifier associated with a corresponding TRP index value from the set of transmission configuration indicator states, and selecting a default PLRS resource based on the transmission configuration identifier, wherein the control resource set associated with the corresponding TRP index value may be in a downlink bandwidth portion that is different from an active downlink bandwidth portion.

[0034] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, determining a default PLRS resource may include operations, features, components, or instructions for determining that PLRS may not be configured for a first transmission and a second transmission of an uplink signal, wherein the first transmission and the second transmission of the uplink signal may be based on downlink control information received according to a single downlink control information scheme, and based on the PLRS not being configured, selecting a default PLRS resource according to a resource selection rule and a corresponding TRP index value.

[0035] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, selecting a default PLRS resource based on a resource selection rule may include operations, features, components, or instructions for determining a first periodic reference signal resource set for a first transmission of an uplink signal based on a first transmission configuration indicator identifier value from a first pair of transmission configuration indicators, determining a second periodic reference signal resource set for a second transmission of the uplink signal based on a second transmission configuration indicator identifier value from a second pair of transmission configuration indicators, and selecting the default PLRS resource based on the first periodic reference signal resource set and the second periodic reference signal resource set.

[0036] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, the first transmission configuration indicator identifier value may be a lowest transmission configuration indicator identifier value of a first pair of transmission configuration indicators, and wherein the second transmission configuration indicator identifier value may be a lowest transmission configuration indicator identifier value of a second pair of transmission configuration indicators.

[0037] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, selecting a default PLRS resource based on a resource selection rule may include operations, features, components, or instructions for determining a set of periodic reference signal resource sets for a first transmission and a second transmission of an uplink signal based on a pair of transmission configuration indicators from a set of transmission configuration indicator pairs, and selecting a default PLRS resource based on the periodic reference signal resource set.

[0038] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, the pair of transmission configuration indicators may have a lowest sum of transmission configuration indicator identifier values, or may have a highest sum of transmission configuration indicator identifier values, or correspond to a first transmission configuration indicator code point having a multiple transmission configuration indicator state.

[0039] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, selecting a default PLRS resource according to a resource selection rule may include operations, features, components, or instructions for determining, for a first transmission and a second transmission of an uplink signal, a first reference signal resource set that may be based on a single-panel transmission and a second reference signal resource set that may be based on a predefined mapping between the first reference signal resource set and the second reference signal resource set, and selecting the default PLRS resource based on the first reference signal resource set or the second reference signal resource set or any combination thereof.

[0040] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, the predefined mapping may be based on one or more pairs of transmission configuration indicator states.

[0041] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, the uplink signal includes data on a physical uplink shared channel, or control information on a physical uplink control channel, or a sounding reference signal. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] Figure 1 An example of a wireless communication system supporting a default path loss reference signal (PLRS) for multi-panel uplink transmissions according to aspects of the present disclosure is shown.

[0043] Figure 2A and Figure 2B An example of a wireless communication system supporting a default PLRS for multi-panel uplink transmission according to aspects of the present disclosure is shown.

[0044] Figure 3 An example of a process flow supporting a default PLRS for multi-panel uplink transmissions according to aspects of the present disclosure is shown.

[0045] Figure 4 and Figure 5 A block diagram of an apparatus supporting a default PLRS for multi-panel uplink transmissions according to aspects of the present disclosure is shown.

[0046] Figure 6 A block diagram of a communication manager supporting a default PLRS for multi-panel uplink transmissions according to aspects of the present disclosure is shown.

[0047] Figure 7 A diagram of a system including devices supporting a default PLRS for multi-panel uplink transmissions according to aspects of the present disclosure is shown.

[0048] Figures 8 to 10 A flow chart of a method of supporting a default PLRS for multi-panel uplink transmission according to aspects of the present disclosure is shown. DETAILED DESCRIPTION

[0049] In some wireless communication systems, a user equipment (UE) may be configured to communicate with multiple transmit / receive points (TRPs) of one or more base stations. In such a system, communication with multiple TRPs may be performed using different antenna panels (e.g., antenna arrays) at the UE, where different antenna panels may be used to communicate with different TRPs. This communication scheme may be referred to as multi-TRP communication, multi-panel communication, mTRP, multi-TRP transmit and receive, multi-panel transmit and receive, or other similar terms. Multi-TRP / multi-panel communication may be scheduled by one or more control signals received at the UE, which may include one downlink control information (DCI) for scheduling each communication using different antenna panels of the UE, or may include multiple (e.g., two) DCIs for separately scheduling each communication using different antenna panels of the UE.

[0050] The UE may send various reference signals in the system, which may include various reference signals used for channel and link measurements and reference signals (e.g., path loss reference signals (PLRS)) used to determine some path loss or attenuation of one or more communication links (e.g., beams). PLRS may be beam-specific and may be associated with other signals sent by the UE, such as data on a physical uplink shared channel (PUSCH), control information on a physical uplink control channel (PUCCH), a sounding reference signal (SRS), or other signaling and messages. In some cases, the resources used to transmit one or more PLRS for the corresponding beam may be configured by the network. For example, the UE may receive an indication of a PLRS resource configuration from a TRP of a base station, and the UE may send one or more PLRS to one or more TRPs based on the configuration of the PLRS resources. However, in some cases, the UE may not configure PLRS resources for a period of time, or the base station may refrain from configuring the UE with PLRS resources to reduce signaling overhead. The lack of PLRS resources may prevent the UE from sending one or more PLRS, which may reduce transmission quality or increase transmission delay.

[0051] Various aspects of the present disclosure provide techniques for determining PLRS resources (e.g., default PLRS resources and corresponding resource indexes) in the context of multiple TRP communication schemes. In some cases, the UE may be configured to send uplink signals (e.g., PUSCH, PUCCH, SRS) to multiple TRPs using different antenna panels. For example, the UE may receive one or more control messages (e.g., DCI, uplink grant, etc.) from the TRP that schedules the uplink signal, and the UE may determine the PLRS resources based on the control message. The TRP may send a control message to the UE, and the control message may indicate or otherwise be associated with a TRP index value corresponding to the TRP that sends the control message. In other cases, the control message may include or indicate information of multiple TRPs, and the TRP index value may be determined from the indicated information. In some examples, the UE may be configured with multiple PLRSs, and the UE may determine the default PLRS resources based on multiple configured PLRSs, TRP index values, and resource selection rules. In some additional or alternative examples, the UE may identify multiple control resource sets (CORESETs) and determine the PLRS resources based on multiple CORESETs, TRP index values, and resource selection rules. In some cases, the UE may determine the default PLRS resources for the TRP based on the lowest identifier of the configured PLRS corresponding to the TRP, while in some other cases, the UE may determine the PLRS resources for the TRP based on the lowest index of the control resource set corresponding to the TRP.

[0052] Such a technique may include, at a UE configured for multiple transmissions of uplink signals to multiple TRPs, identifying multiple TRP index values ​​corresponding to multiple TRPs. The UE may determine the default PLRS resources of one or more PLRSs associated with the multiple transmissions of the uplink signal and use the default PLRS resources to send the one or more PLRSs. In some cases, the UE may receive a control message from a first TRP and determine the default PLRS resources of the first TRP and the second TRP based on the control message. In some other cases, the UE may receive a first control message from the first TRP and a second control message from the second TRP, and the UE may determine the default PLRS resources of the first TRP based on the first control message and determine the default PLRS resources of the second TRP based on the second control message. As described herein, determining the PLRS resources of multiple TRPs may reduce signaling overhead and improve radio resource efficiency.

[0053] Various aspects of the subject matter described herein can be implemented to achieve one or more of the following potential improvements and advantages, as well as other benefits. For example, such a technique can provide benefits and enhancements for the operation of a UE. For example, when a UE lacks explicit configuration of reference signal resources, the technique can provide a resource selection scheme. Such a technique can accordingly implement effective identification of reference signal resources, thereby ensuring the transmission of reference signals that can be used to improve and manage link quality and efficiency. In some examples, the default resource selection scheme can reduce signaling overhead by reducing or limiting the number of configurations provided to the UE, so that the UE can continue to operate without such a configuration (e.g., by falling back to the default resource selection scheme described herein). In some other examples, the selection of default PLRS resources can provide power consumption improvements, increased data rates, improved efficiency of high reliability and low latency operations, and other benefits provided by enhancing communication links to prevent failures.

[0054] Various aspects of the disclosure are first described in the context of a wireless communication system. Various aspects of the disclosure are then described in the context of a process flow. Various aspects of the disclosure are further illustrated and described with reference to apparatus diagrams, system diagrams, and flow diagrams related to a default path loss reference signal for multi-panel uplink transmissions.

[0055] Figure 1 An example of a wireless communication system 100 supporting a default path loss reference signal for multi-panel uplink transmission according to aspects of the present disclosure is shown. The wireless communication system 100 may include one or more base stations 105, one or more UEs 115, and a core network 130. In some examples, the wireless communication system 100 may be a long term evolution (LTE) network, an LTE-Advanced (LTE-A) network, an LTE-A Pro network, or a new radio (NR) network. In some examples, the wireless communication system 100 may support enhanced broadband communications, ultra-reliable (e.g., mission-critical) communications, low-latency communications, communications with low-cost and low-complexity devices, or a combination thereof.

[0056] The base stations 105 may be dispersed throughout a geographic area to form the wireless communication system 100, and may be devices of different forms or with different capabilities. The base stations 105 and the UEs 115 may communicate wirelessly via one or more communication links 125. Each base station 105 may provide a coverage area 110 over which the UEs 115 and the base stations 105 may establish one or more communication links 125. The coverage area 110 may be an example of a geographic area over which the base stations 105 and the UEs 115 may support communication of signals according to one or more radio access technologies.

[0057] The UEs 115 may be dispersed throughout the coverage area 110 of the wireless communication system 100, and each UE 115 may be stationary or mobile, or both, at different times. The UEs 115 may be devices of different forms or with different capabilities. Figure 1 Some example UEs 115 are shown in FIG. 1. The UEs 115 described herein may be able to communicate with various types of devices, such as other UEs 115, base stations 105, or network devices (e.g., core network nodes, relay devices, integrated access and backhaul (IAB) nodes, or other network devices), such as Figure 1 as shown in .

[0058] Base stations 105 may communicate with core network 130, or with each other, or both. For example, base stations 105 may interface with core network 130 via one or more backhaul links 120 (e.g., via S1, N2, N3, or other interfaces). Base stations 105 may communicate with each other via backhaul links 120 (e.g., via X2, Xn, or other interfaces) directly (e.g., directly between base stations 105) or indirectly (e.g., via core network 130), or both. In some examples, backhaul links 120 may be or may include one or more wireless links.

[0059] One or more of the base stations 105 described herein may include or be referred to by a person of ordinary skill in the art as a base transceiver station, a radio base station, an access point, a radio transceiver, a NodeB, an eNodeB (eNB), a next generation NodeB or a giga NodeB (any of which may be referred to as a gNB), a Home NodeB, a Home eNodeB, or other suitable terminology.

[0060] UE 115 may include or be referred to as a mobile device, a wireless device, a remote device, a handheld device, or a subscriber device, or some other suitable terminology, where a "device" may also be referred to as a unit, a station, a terminal, or a client, etc. UE 115 may also include or be referred to as 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 include or be referred to as a wireless local loop (WLL) station, an Internet of Things (IoT) device, an Internet of Everything (IoE) device, or a machine type communication (MTC) device, etc., which may be implemented in various objects, such as appliances, vehicles, meters, etc.

[0061] The UE 115 described herein may be capable of communicating with various types of devices, such as other UEs 115 and base stations 105, which may sometimes act as relays, and network devices including macro eNBs or gNBs, small cell eNBs or gNBs, or relay base stations, such as Figure 1 as shown in .

[0062] The UE 115 and the base station 105 can communicate with each other wirelessly via one or more communication links 125 on one or more carriers. The term "carrier" can refer to a set of radio spectrum resources with a defined physical layer structure for supporting the communication link 125. For example, the carrier used for the communication link 125 can include a portion of the radio spectrum band (e.g., bandwidth portion (BWP)) that operates according to one or more physical layer channels for a given radio access technology (e.g., LTE, LTE-a, LTE-a Pro, NR). Each physical layer channel can carry acquisition signaling (e.g., synchronization signals, system information), control signaling for coordinating carrier operations, user data, or other signaling. The wireless communication system 100 can use carrier aggregation or multi-carrier operation to support communication with the UE 115. According to the carrier aggregation configuration, the UE 115 can be configured with multiple downlink component carriers and one or more uplink component carriers. Carrier aggregation can be used with frequency division duplex (FDD) and time division duplex (TDD) component carriers.

[0063] In some examples (e.g., in a carrier aggregation configuration), a carrier may also have acquisition signaling or control signaling that coordinates the operation of other carriers. A carrier may be associated with a 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 grid for discovery by a UE 115. A carrier may operate in a standalone mode, where initial acquisition and connection may be performed by a UE 115 via the carrier, or a carrier may operate in a non-standalone mode, where a different carrier (e.g., with the same or different radio access technology) is used to anchor the connection.

[0064] The communication link 125 shown in the wireless communication system 100 may include an uplink transmission from the UE 115 to the base station 105, or a downlink transmission from the base station 105 to the UE 115. A carrier may carry downlink or uplink communications (e.g., in FDD mode), or may be configured to carry both downlink and uplink communications (e.g., in TDD mode).

[0065] A carrier may be associated with a particular bandwidth of a radio frequency spectrum, and in some examples, the carrier bandwidth may be referred to as a "system bandwidth" of a carrier or wireless communication system 100. For example, a carrier bandwidth may be one of a plurality of determined bandwidths (e.g., 1.4, 3, 5, 10, 15, 20, 40, or 80 megahertz (MHz)) of a carrier for a particular radio access technology. A device (e.g., a base station 105 or a UE 115 or both) of the wireless communication system 100 may have a hardware configuration that supports communications on a particular carrier bandwidth, or may be configured to support communications on one of a set of carrier bandwidths. In some examples, the wireless communication system 100 may include a base station 105 and or a UE 115 that may support simultaneous communications via a carrier associated with multiple carrier bandwidths. In some examples, each served UE 115 may be configured to operate on a portion (e.g., a subband, a BWP) or all of a carrier bandwidth.

[0066] The signal waveform transmitted on the carrier may be composed of multiple subcarriers (e.g., using multi-carrier modulation (MCM) techniques, such as orthogonal frequency division multiplexing (OFDM) or discrete Fourier transform spread OFDM (DFT-S-OFDM)). In a system employing MCM techniques, a resource element may include a symbol period (e.g., the duration of a modulation symbol) and a subcarrier, where the symbol period and the subcarrier spacing are inversely related. The number of bits carried by each resource element may depend on the modulation scheme (e.g., the order of the modulation scheme, the coding rate of the modulation scheme, or both). Therefore, the more resource elements received by UE 115 and the higher the order of the modulation scheme, the higher the data rate of UE 115. Wireless communication resources may refer to a combination of radio spectrum resources, time resources, and spatial resources (e.g., spatial layers or beams), and the use of multiple spatial layers may further increase the data rate or data integrity used to communicate with UE 115.

[0067] One or more parameter sets for a carrier may be supported, where the parameter set may include a subcarrier spacing (Δf) and a cyclic prefix. A carrier may be divided into one or more BWPs with the same or different parameter sets. In some examples, a UE 115 may be configured with multiple BWPs. In some examples, a single BWP for a carrier may be active at a given time, and communications for a UE 115 may be limited to the one or more active BWPs.

[0068] The time interval of the base station 105 or the UE 115 can be expressed as a multiple of a basic time unit, which can be, for example, T s =1 / (Δf max ·N f ) seconds sampling period, where Δf max It can represent the maximum supported subcarrier spacing, and Nf The maximum supported discrete Fourier transform (DFT) size may be indicated. The time intervals of the communication resources may be organized according to radio frames each having a specified duration (e.g., 10 milliseconds (ms)). Each radio frame may be identified by a system frame number (SFN) (e.g., ranging from 0 to 1023).

[0069] Each frame may include multiple consecutively numbered subframes or time slots, and each subframe or time slot may have the same duration. In some examples, the frame may be divided (e.g., in the time domain) into subframes, and each subframe may be further divided into multiple time slots. Alternatively, each frame may include a variable number of time slots, and the number of time slots may depend on the subcarrier spacing. Each time slot may include multiple symbol periods (e.g., depending on the length of the cyclic prefix appended to each symbol period). In some wireless communication systems 100, the time slot may be further divided into multiple small time slots containing one or more symbols. In addition to the cyclic prefix, each symbol period may contain one or more (e.g., N f ) sampling period. The duration of a symbol period may depend on the subcarrier spacing or frequency band of operation.

[0070] A subframe, a time slot, a mini-slot, or a symbol may be the smallest scheduling unit (e.g., in the time domain) of the wireless communication system 100 and may be referred to as a transmission time interval (TTI). In some examples, the TTI duration (i.e., the number of symbol periods in a TTI) may be variable. Additionally or alternatively, the smallest scheduling unit of the wireless communication system 100 may be dynamically selected (e.g., in a burst of a shortened TTI (sTTI)).

[0071] Physical channels may be multiplexed on a carrier according to various techniques. Physical control channels and physical data channels may be multiplexed on a downlink carrier, for example, using one or more of a time division multiplexing (TDM) technique, a frequency division multiplexing (FDM) technique, or a hybrid TDM-FDM technique. A control region (e.g., a control resource set (CORESET)) of a physical control channel may be defined by a plurality of symbol periods and may extend across a subset of a system bandwidth or a system bandwidth of a carrier. One or more control regions (e.g., CORESETs) may be configured for a group of UEs 115. For example, one or more of the UEs 115 may monitor or search a control region for control information according to one or more search space sets, and each search space set may include one or more control channel candidates in one or more aggregation levels arranged in a cascaded manner. The aggregation level of a control channel candidate may refer to a plurality of control channel resources (e.g., control channel elements (CCEs)) associated with coded information of a control information format having a given payload size. A search space set may include a common search space set configured to send control information to a plurality of UEs 115 and a UE-specific search space set for sending control information to a particular UE 115. In some examples, one or more CORESETs may be associated with a particular pool index (eg, a CORESET pool index value).

[0072] Each base station 105 may provide communication coverage via one or more cells, such as macro cells, small cells, hot spots, or other types of cells, or any combination thereof. The term "cell" may refer to a logical communication entity used to communicate 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), or other) used to distinguish adjacent cells. In some examples, a cell may also refer to a geographic coverage area 110 or a portion of a geographic coverage area 110 (e.g., a sector) on which a logical communication entity operates. Depending on various factors (such as the capabilities of the base station 105), such a cell range may range from a smaller area (e.g., a structure, a subset of a structure) to a larger area. For example, a cell may be or may include a building, a subset of a building, or an external space between or overlapping a geographic coverage area 110, etc.

[0073] A macro cell typically covers a relatively large geographic area (e.g., a radius of several kilometers) and may allow UE 115 to access the network without restriction by subscribing to a service provided by a network provider supporting the macro cell. A small cell may be associated with a base station 105 with lower power than a macro cell, and the small cell may operate in a frequency band that is the same or different (e.g., licensed, unlicensed) from the macro cell. A small cell may provide unrestricted access to a UE 115 with a service subscription to a network provider, or may provide restricted access to a UE 115 associated with a small cell (e.g., a UE 115 in a closed user group (CSG), a UE 115 associated with a user in a home or office). A base station 105 may support one or more cells, and may also support communications on one or more cells using one or more component carriers.

[0074] In some examples, a carrier may support multiple cells, and different cells may be configured according to different protocol types (e.g., MTC, narrowband Internet of Things (NB-IoT), enhanced mobile broadband (eMBB)) that may provide access to different types of devices.

[0075] In some examples, base stations 105 may be mobile and, therefore, provide communication coverage for mobile geographic coverage areas 110. In some examples, different geographic coverage areas 110 associated with different technologies may overlap, but the different geographic coverage areas 110 may be supported by the same base station 105. In other examples, overlapping geographic coverage areas 110 associated with different technologies may be supported by different base stations 105. The wireless communication system 100 may include, for example, a heterogeneous network in which different types of base stations 105 provide coverage for various geographic coverage areas 110 using the same or different radio access technologies.

[0076] The wireless communication system 100 may support synchronous or asynchronous operation. For synchronous operation, the base stations 105 may have similar frame timing, and transmissions from different base stations 105 may be approximately aligned in time. For asynchronous operation, the base stations 105 may have different frame timing, and transmissions from different base stations 105 may not be aligned in time in some examples. The techniques described herein may be used for synchronous or asynchronous operation.

[0077] Some UEs 115, such as MTC or IoT devices, may be low-cost or low-complexity devices and may provide automatic communication between machines (e.g., via machine-to-machine (M2M) communication). M2M communication or MTC may refer to data communication technology that allows devices to communicate with each other or with a base station 105 without human intervention. In some examples, M2M communication or MTC may include communications from devices that integrate sensors or meters to measure or capture information and relay such information to a central server or application, which may utilize or present the information to a person interacting with the application. Some UEs 115 may be designed to collect information or implement automatic behavior of machines or other devices. Examples of applications for MTC devices include smart metering, inventory monitoring, water level monitoring, equipment monitoring, healthcare monitoring, wildlife monitoring, weather and geological event monitoring, fleet management and tracking, remote security sensing, physical access control, and transaction-based business charging.

[0078] Some UEs 115 may be configured to employ a reduced power consumption mode of operation, such as half-duplex communication (e.g., a mode that supports unidirectional communication via transmission or reception but not simultaneous transmission and reception). In some examples, half-duplex communication may be performed at a reduced peak rate. Other power saving techniques for UE 115 include entering a power-saving deep sleep mode when not engaged in active communication, operating over a limited bandwidth (e.g., in accordance with narrowband communication), or a combination of these techniques. For example, some UEs 115 may be configured to operate using a narrowband protocol type associated with a defined portion or range (e.g., a set of subcarriers or resource blocks (RBs)) within a carrier, within a guard band of a carrier, or outside a carrier.

[0079] The wireless communication system 100 can be configured to support ultra-reliable communication or low-delay communication or various combinations thereof. For example, the wireless communication system 100 can be configured to support ultra-reliable low-delay communication (URLLC) or mission-critical communication. UE 115 can be designed to support ultra-reliable, low-delay or critical functions (e.g., mission-critical functions). Ultra-reliable communication can include dedicated communication or group communication, and can be supported by one or more mission-critical services, such as mission-critical push-to-talk (MCPTT), mission-critical video (MCVideo) or mission-critical data (MCData). Support for mission-critical functions can include the priority of the service, and mission-critical services can be used for public safety or general commercial applications. The terms ultra-reliable, low-delay, mission-critical and ultra-reliable low-delay can be used interchangeably in this article.

[0080] In some examples, UE 115 is also able to communicate directly with other UE 115 via a device-to-device (D2D) communication link 135 (e.g., using a peer-to-peer (P2P) or D2D protocol). One or more UEs 115 utilizing D2D communication may be within a geographic coverage area 110 of a base station 105. Other UEs 115 in such a group may be outside the geographic coverage area 110 of the base station 105 or otherwise unable to receive transmissions from the base station 105. In some examples, a group of UEs 115 communicating via D2D communication may utilize a one-to-many (1:M) system, in which each UE 115 transmits to each other UE 115 in the group. In some examples, the base station 105 facilitates the scheduling of resources for D2D communication. In other cases, D2D communication is performed between UEs 115 without the involvement of the base station 105.

[0081] In some systems, the D2D communication link 135 can be an example of a communication channel between vehicles (e.g., UE 115), such as a sidelink communication channel. In some examples, vehicles can communicate using vehicle-to-everything (V2X) communication, vehicle-to-vehicle (V2V) communication, or some combination of these communications. Vehicles can send information related to traffic conditions, signal scheduling, weather, safety, emergency situations, or any other information related to the V2X system. In some examples, vehicles in a V2X system can communicate with roadside infrastructure (such as roadside units), communicate with a network via one or more network nodes (e.g., base station 105) using vehicle-to-network (V2N) communication, or both.

[0082] 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) or a 5G core (5GC), which may include at least one control plane entity (e.g., a mobility management entity (MME), an access and mobility management function (AMF)) for managing access and mobility, and at least one user plane entity (e.g., a serving gateway (S-GW), a packet data network (PDN) gateway (P-GW), or a user plane function (UPF)) for routing packets or interconnections to an external network. The control plane entity may manage non-access stratum (NAS) functions of the UE 115 served by the base station 105 associated with the core network 130, such as mobility, authentication, and bearer management. User IP packets may be transmitted through the user plane entity, which may provide IP address allocation and other functions. The user plane entity may be connected to IP services 150 of one or more network operators. The IP services 150 may include access to the Internet, (multiple) intranets, IP multimedia subsystems (IMS), or packet switched (PS) streaming services.

[0083] Some network devices, such as base stations 105, may include subcomponents such as access network entities 140, which may be examples of access node controllers (ANCs). Each access network entity 140 may communicate with UE 115 through one or more other access network transport entities 145, which may be referred to as radio heads, smart radio heads, or transmit / receive points (TRPs). Each access network transport entity 145 may include one or more antenna panels. In some configurations, the various functions of each access network entity 140 or base station 105 may be distributed across various network devices (e.g., radio heads and ANCs), or merged into a single network device (e.g., base station 105).

[0084] The wireless communication system 100 can operate using one or more frequency bands, for example, in the range of 300 megahertz (MHz) to 300 gigahertz (GHz). Typically, the region from 300 MHz to 3 GHz is referred to as the ultra-high frequency (UHF) region or decimeter band, because the length of the wavelength ranges from about one decimeter to one meter. UHF waves can be blocked or redirected by buildings and environmental features, but the waves can penetrate the structure sufficiently so that the macro cell provides service to the UE 115 located indoors. Compared to transmissions of smaller frequencies and longer waves using the high frequency (HF) or very high frequency (VHF) portion of the spectrum below 300 MHz, transmissions of UHF waves can be associated with smaller antennas and shorter ranges (e.g., less than 100 kilometers).

[0085] The wireless communication system 100 may also operate in a super high frequency (SHF) region using a frequency band from 3 GHz to 30 GHz (also referred to as a centimeter band), or in an extremely high frequency (EHF) region of the spectrum (e.g., from 30 GHz to 300 GHz) (also referred to as a millimeter band). In some examples, the wireless communication system 100 may support millimeter wave (mmW) communications between UE 115 and base station 105, and the EHF antennas of each device may be smaller and more closely spaced than UHF antennas. In some examples, this may facilitate the use of antenna arrays within the device. However, the propagation of EHF transmissions may suffer greater atmospheric attenuation than SHF or UHF transmissions and have a shorter range. The techniques disclosed herein may be employed between transmissions using one or more different frequency regions, and the designated use of frequency bands spanning these frequency regions may vary from country to country or regulatory agency.

[0086] The wireless communication system 100 can utilize licensed and unlicensed radio spectrum bands. For example, the wireless communication system 100 can employ license assisted access (LAA), LTE unlicensed (LTE-U) radio access technology, or NR technology in an unlicensed band such as the 5 GHz industrial, scientific, and medical (ISM) band. When operating in an unlicensed radio spectrum band, devices such as base stations 105 and UEs 115 can use carrier sensing for conflict detection and avoidance. In some examples, operations in unlicensed bands can be combined with component carriers operating in licensed bands (e.g., LAA) based on a carrier aggregation configuration. Operations in unlicensed spectrum can include downlink transmissions, uplink transmissions, P2P transmissions, or D2D transmissions, etc.

[0087] The base station 105 or UE 115 may be equipped with multiple antennas, which may be used to employ technologies such as transmit diversity, receive diversity, multiple-input multiple-output (MIMO) communications, or beamforming. The antennas of the base station 105 or UE 115 may be located within one or more antenna arrays or antenna panels, which may support MIMO operations, or transmit or receive beamforming. For example, one or more base station antennas or antenna arrays may be co-located at an antenna assembly such as an antenna tower. In some examples, the antennas or antenna arrays associated with the base station 105 may be located at different geographical locations. The base station 105 may have an antenna array with several rows and columns of antenna ports, which the base station 105 may use to support beamforming for communications with the UE 115. Similarly, the UE 115 may have one or more antenna arrays, which may support various MIMO or beamforming operations. Additionally or alternatively, the antenna panel may support radio frequency beamforming of signals sent via the antenna ports.

[0088] The base station 105 or UE 115 can use MIMO communication to exploit multipath signal propagation and improve spectral efficiency by sending or receiving multiple signals via different spatial layers. This technology can be referred to as spatial multiplexing. Multiple signals can be sent, for example, by a transmitting device via different antennas or different combinations of antennas. Similarly, multiple signals can be received by a receiving device via different antennas or different combinations of antennas. Each of the multiple signals can be referred to as a separate spatial stream and can carry bits associated with the same data stream (e.g., the same codeword) or different data streams (e.g., different codewords). Different spatial layers can be associated with different antenna ports for channel measurement and reporting. MIMO technology includes single-user MIMO (SU-MIMO) that sends multiple spatial layers to the same receiving device, and multi-user MIMO (MU-MIMO) that sends multiple spatial layers to multiple devices.

[0089] Beamforming, which may also be referred to as spatial filtering, directional transmission, or directional reception, is a signal processing technique that may be used at a transmitting device or a receiving device (e.g., a base station 105, a UE 115) to form or direct an antenna beam (e.g., a transmit beam or a receive beam) along a spatial path between the transmitting device and the receiving device. Beamforming may be achieved by combining signals transmitted via antenna elements of an antenna array so that some signals propagating in a particular direction relative to the antenna array experience coherent interference and other signals experience destructive interference. Adjustments to signals communicated via antenna elements may include a transmitting device or a receiving device applying an amplitude offset, a phase offset, or both to a signal carried via each antenna element associated with the device. The adjustments associated with each antenna element may be defined by a set of beamforming weights associated with a particular direction (e.g., with respect to an antenna array of a transmitting device or a receiving device, or with respect to some other direction).

[0090] The base station 105 or the UE 115 may use beam scanning techniques as part of a beamforming operation. For example, the base station 105 may use multiple antennas or antenna arrays (e.g., antenna panels) to perform beamforming operations for directional communications with the UE 115. Some signals (e.g., synchronization signals, reference signals, beam selection signals, or other control signals) may be sent multiple times by the base station 105 in different directions. For example, the base station 105 may send signals according to different sets of beamforming weights associated with different transmission directions. Transmissions in different beam directions may be used to identify (e.g., by a transmitting device such as the base station 105 or a receiving device such as the UE 115) the beam direction for subsequent transmission or reception by the base station 105.

[0091] Base station 105 may transmit some signals, such as data signals associated with a particular receiving device, in a single beam direction (e.g., a direction associated with a receiving device such as UE 115). In some examples, a beam direction associated with transmissions along a single beam direction may be determined based on signals transmitted in one or more beam directions. For example, UE 115 may receive one or more signals transmitted by base station 105 in different directions and may report to base station 105 an indication of the signal received by UE 115 with the highest signal quality or other acceptable signal quality.

[0092] In some examples, transmission by a device (e.g., by a base station 105 or a UE 115) may be performed using multiple beam directions, and the device may generate a combined beam for transmission (e.g., from the base station 105 to the UE 115) using a combination of digital precoding or radio frequency beamforming. The UE 115 may report feedback indicating precoding weights for one or more beam directions, and the feedback may correspond to a configured number of beams across a system bandwidth or one or more subbands. The base station 105 may send a reference signal (e.g., a cell-specific reference signal (CRS), a channel state information reference signal (CSI-RS)), which may be precoded or non-precoded. The UE 115 may provide feedback for beam selection, which may be a precoding matrix indicator (PMI) or codebook-based feedback (e.g., a multi-panel type codebook, a linear combination type codebook, or a port selection type codebook). Although these techniques are described with reference to signals sent by base station 105 in one or more directions, UE 115 may employ similar techniques for sending signals multiple times in different directions (e.g., for identifying a beam direction for subsequent transmission or reception by UE 115), or for sending signals in a single direction (e.g., for sending data to a receiving device).

[0093] When receiving various signals (such as synchronization signals, reference signals, beam selection signals, or other control signals) from the base station 105, the receiving device (e.g., UE 115) can try multiple reception configurations (e.g., directional listening). For example, the receiving device can try multiple reception directions by receiving via different antenna subarrays, by processing the received signal according to different antenna subarrays, by receiving according to different reception beamforming weight sets (e.g., different directional listening weight sets) applied to the signal received at multiple antenna elements of the antenna array, or by processing the received signal according to different reception beamforming weight sets applied to the signal received at multiple antenna elements of the antenna array, any of which can be referred to as "listening" according to different reception configurations or reception directions. In some examples, the receiving device can receive along a single beam direction using a single reception configuration (e.g., when receiving a data signal). The single reception configuration can be aligned with a beam direction in a beam direction determined based on listening according to different reception configuration directions (e.g., a beam direction determined to have the highest signal strength, the highest signal-to-noise ratio (SNR), or other acceptable signal quality based on listening according to multiple beam directions).

[0094] The wireless communication system 100 may be a packet-based network that operates according to a layered protocol stack. In the user plane, communications on a bearer or packet data convergence protocol (PDCP) layer may be based on IP. The radio link control (RLC) layer may perform packet segmentation and reassembly to communicate over a logical channel. The medium access control (MAC) layer may perform priority processing and multiplex logical channels into transport channels. The MAC layer may also support retransmission at the MAC layer using error detection techniques, error correction techniques, or both to improve link efficiency. In the control plane, a radio resource control (RRC) protocol layer may provide the establishment, configuration, and maintenance of an RRC connection between a UE 115 and a base station 105 or a core network 130 that supports a radio bearer for user plane data. At the physical layer, a transport channel may be mapped to a physical channel.

[0095] UE 115 and base station 105 may support retransmission of data to increase the likelihood of successfully receiving the data. Hybrid automatic repeat request (HARQ) feedback is a technique that increases the likelihood of correctly receiving data over communication link 125. HARQ may include a combination of error detection (e.g., using a cyclic redundancy check (CRC)), forward error correction (FEC), and retransmission (e.g., automatic repeat request (ARQ)). HARQ may improve the throughput of the MAC layer under poor radio conditions (e.g., low signal-to-noise ratio conditions). In some examples, a device may support HARQ feedback for the same time slot, wherein the device may provide HARQ feedback in a particular time slot for data received in a previous symbol in the time slot. In other cases, the device may provide HARQ feedback in a subsequent time slot or according to some other time intervals.

[0096] A quasi-co-sited (QCL) relationship between one or more transmissions or signals may refer to a relationship between antenna ports (and corresponding signaling beams) of the corresponding transmissions. For example, one or more antenna ports may be implemented by a base station 105 for sending at least one or more reference signals (such as a downlink reference signal, a synchronization signal block (SSB) or the like) and control information transmissions to a UE 115. However, the channel characteristics of signals sent via different antenna ports may be interpreted as being the same (e.g., by a receiving device) (e.g., although the signals are sent from different antenna ports), and the antenna ports (and corresponding beams) may be determined to be quasi-co-sited (QCLized). In this case, a UE 115-b may have a corresponding antenna port for receiving a receive beam of a QCLized transmission (e.g., a reference signal). The QCLized signal may enable the UE 115 to derive characteristics of a first signal sent on a first antenna port (e.g., delay spread, Doppler spread, frequency shift, average power, etc.) from measurements on a second signal sent via a second antenna port. Additionally or alternatively, both antenna ports are spatially QCLed, wherein characteristics of a signal transmitted via a directional beam can be derived from characteristics of a different signal on another, different directional beam.

[0097] Different types of QCL relationships can describe the relationship between two different signals or antenna ports. For example, QCL-TypeA can refer to a QCL relationship between signals including Doppler shift, Doppler spread, average delay, and delay spread. QCL-TypeB can refer to a QCL relationship including Doppler shift and Doppler spread, while QCL-TypeC can refer to a QCL including Doppler shift and average delay. QCL-TypeD can refer to a QCL relationship of spatial parameters, which can indicate the relationship between two or more directional beams used for communication signals. Here, the spatial parameters indicate that the first beam used to send a first signal can be similar (or the same) as another beam used to send a second, different signal, or that the first and second signals can be received with the same receiving beam. Therefore, beam information of various beams can be derived by receiving signals from a transmitting device, where in some cases, QCL information or spatial information can help the receiving device effectively identify the communication beam (e.g., without having to scan a large number of beams to identify the best beam (e.g., the beam with the highest signal quality)). Furthermore, QCL relations may exist for both uplink and downlink transmissions, and in some cases, the QCL relations may also be referred to as spatial relation information.

[0098] In some examples, a transmission configuration indication (TCI) state configuration may include one or more parameters associated with a QCL relationship between transmitted signals. Here, the base station 105 may configure, for example, a QCL relationship that provides a mapping between a reference signal and an antenna port of another signal (e.g., a demodulation reference signal (DMRS) antenna port for a PDCCH, a DMRS antenna port for a physical downlink shared channel (PDSCH), a CSI-RS antenna port for a CSI-RS, or the like), and the base station 105 may indicate the TCI state to the UE 115. In this case, the TCI state may be indicated via a DCI (e.g., within a CORESET), and the QCL relationship associated with the TCI state (and further established by higher layer parameters) may provide the UE 115 with the QCL relationship of the corresponding antenna port and signal transmitted by the base station 105. In some examples, the TCI state may be indicated via a medium access control (MAC)-control element (CE).

[0099] The UE 115 may determine one or more reference signal resources (e.g., path loss reference signal (PLRS) resources) using TCI information indicated in a MAC-CE (e.g., a control message). The MAC-CE may correspond to a CORESET (e.g., as indicated by a CORESET Pool ID field) and indicate TCI state information for the corresponding CORESET. In some examples, the UE 115 may determine one reference signal resource from the MAC-CE, and thus the UE 115 may determine multiple reference signal resources for multiple TRPs based on multiple MAC-CEs. For example, the UE 115 may determine a first reference signal resource for a first TRP based on an active TCI state of a MAC-CE corresponding to a first TRP index (e.g., a MAC-CE corresponding to the same CORESET ID as the first TRP), and determine a second reference signal resource for a second TRP based on an active TCI state of a different MAC-CE corresponding to a second TRP index (e.g., a MAC-CE corresponding to the same CORESET ID as the second TRP).

[0100] In some other examples, the UE 115 may determine multiple reference signal resources corresponding to multiple TRPs from the MAC-CE. In such an example, the MAC-CE may indicate TCI states corresponding to multiple to multiple TRP indexes (e.g., multiple groups of TCI state information). In some cases, the MAC-CE may include a TCI code point indicating whether the TCI group includes TCI information corresponding to one TRP index or TCI information corresponding to two TCI indexes (e.g., a pair of TCI states). In some cases, the UE 115 may determine an uplink beam (e.g., a reference signal resource) based on an implicit or explicit indication of an uplink beam that is QCLed with a downlink beam. The UE 115 may select an uplink beam as a default PLRS and send one or more reference signals to one or more TRPs via the uplink beam. In some cases, the UE 115 may send one or more uplink signals (e.g., PUCCH, PUSCH, SRS) to one or more TRPs based on sending one or more reference signals.

[0101] Uplink signals (e.g., PUCCH, PUSCH, SRS) may be sent to one or more TRPs using multiple transmission resources. In some cases, each transmission resource may be associated with a TRP. In some examples, UE 115 may determine the association between a transmission resource and a TRP based on a signal resource ID (e.g., a PUCCH resource ID, a PUSCH resource ID, or an SRS resource ID) and a predetermined rule. In some examples, the predetermined rule may divide the signal resource ID by the number of TRPs (e.g., for a dual TRP configuration, the first half of the signal ID is used for the first TRP and the second half of the signal ID is used for the second TRP). In another example, UE 115 may determine the association between a transmission resource and a TRP based on assigning or otherwise associating a power control (PC) index (e.g., a closed-loop PC) to the transmission resource. For example, the first and second closed-loop PC indexes may be assigned to the first and second TRPs, respectively.

[0102] In a further example, UE 115 may determine the association between a transmission resource and a TRP based on an uplink resource group identifier (e.g., a PUCCH group ID). In some examples, the association may be determined based on the PUCCH group ID in a single spatial relationship update per PUCCH group. For example, the first and second PUCCH groups may be associated with the first and second TRPs, respectively. In some other cases, each transmission resource may be associated with multiple TRPs. In some examples, UE 115 may be configured as a multi-TRP mode (e.g., spatial division multiplexing (SDM), time division multiplexing (TDM), and / or frequency division multiplexing (FDM)), and UE 115 may switch beam modes (e.g., switch transmission resources) based on resource configuration (e.g., preconfigured resources) or resource configuration indicated in the DCI. It should be understood that the transmission resource association described herein may be applied to multi-TRP transmissions based on single DCI and multi-DCI. In some examples, a single DCI multi-TRP may be identified based on (one or more) TCI code points mapped to two or more TCI states. In some other examples, multi-DCI multi-TRP may be identified based on a higher layer TRP index for each CORESET that is configured and differs between CORESETs in the "PDCCH-config". In a further example, uplink signal (e.g., PUCCH, PUSCH, SRS) resources may be associated with a TRP index by explicitly configuring the TRP index for each uplink signal resource or by following the TRP index of the scheduling CORESET.

[0103] UE 115 may identify corresponding TRP index values ​​corresponding to a first TRP and a second TRP, wherein UE 115 is configured to at least use a first antenna panel to send a first transmission of an uplink signal to the first TRP and use a second antenna panel different from the first antenna panel to send a second transmission of an uplink signal to the second TRP. UE 115 may determine a default PLRS resource of one or more PLRS associated with the first transmission and the second transmission of the uplink signal, the default PLRS resource being based on whether PLRS is configured, the corresponding TRP index value, and the determination of the resource selection rule. UE 115 may use the default PLRS resource to send one or more PLRS. Note that although UE 115 may determine the default PLRS resource for transmission of uplink signaling, the technology may be used for other transmissions and signaling by UE 115 or other devices. For example, the technology described herein may be applied to sidelink communications, which may include D2D communications, V2X communications, V2E communications, or the like. In other examples, UE 115 may be an example of a repeater or a relay node, and the technology described herein may be utilized. As such, the described techniques associated with PLRS resources associated with uplink transmissions should not be considered limiting.

[0104] In some cases, a TRP index (e.g., a TRP index, such as at a base station 105 having one or more TRPs) or a panel index (e.g., an index corresponding to an antenna panel at a UE 115, which may be represented using a value of k (e.g., k=0, 1)) may be implicitly indicated to one or more devices in the wireless communication system 100. For example, the UE 115 may determine the TRP index based on an indirect or implicit indication of the TRP index, or the UE 115 may determine the TRP index based on various parameters, identifiers, index values, or other configurations or signaling associated with the TRP index. As an example, the UE may determine the TRP index based on a resource set identifier or index (e.g., a CORESET pool index), where the CORESET pool index may, for example, have values ​​0 and 1 associated with different TRPs and / or UE panels. In other examples, a reference signal resource set identifier (ID) (e.g., a sounding reference signal (SRS) set ID) and / or a reference signal resource ID (e.g., an SRS resource ID) may indicate a TRP index or a UE panel index. In this case, an SRS set ID or an SRS resource ID may be associated with a UE panel / TRP, and another SRS set ID or SRS resource ID may be associated with another UE panel / TPP. The beam ID and / or beam group ID may also implicitly indicate a panel index or a TRP index, where some beam IDs or beam group IDs may be associated with a UE panel, and another beam ID or beam group ID may be associated with another UE panel. In some examples, a beam may be associated with a TCI state or spatial relationship information (e.g., where transmit and receive beams may have correspondence or reciprocity).

[0105] Additionally or alternatively, a closed-loop index for power control (e.g., an uplink transmit power control configuration may be configured with a closed-loop index) may also provide an implicit indication of a panel index and / or a TRP index. Here, different values ​​of the closed-loop index (e.g., 0, 1) may be associated with different UE panels / TRPs. The antenna port may also provide an implicit indication of a UE antenna panel and / or TRP index, where an antenna port ID or an antenna port group ID may be associated with a UE panel / TRP, and another antenna port ID or antenna port group ID may be associated with another UE panel / TRP. In this case, the antenna port may be associated with various signals, including PUSCH, SRS, phase tracking reference signal (PTRS), etc.

[0106] In some cases, the UE panel index or TRP index can be indicated by a DMRS code division multiplexing (CDM) group ID (e.g., implicitly), such that a first DMRS CDM group ID can be associated with a first UE antenna panel or TRP, and a second, different DMRS CDM group ID can be associated with a second UE antenna panel or TRP. In other examples, a timing advance (TA) group ID (e.g., a TAG ID configured for a panel-specific TA) can indicate a UE panel index or TRP index, where different TAG IDs can be associated with different UE antenna panels or TRPs.

[0107] Similarly, PUCCH resource ID and / or PUCCH group ID can be associated with different UE antenna panels and / or TRPs, and different ID values ​​can correspond to different panels or TRPs. Additionally or alternatively, two or more radio network temporary identifiers (RNTIs) can be associated with corresponding UE panels or TRPs. In some examples, a physical cell identifier (PCI), a synchronization signal block (SSB) set ID, etc. can provide an indication of a UE panel or TRP, wherein a PCI or SSB set ID can be associated with a UE panel / TRP, and another PCI or SSA set ID can be associated with another UE panel / TPP. In some cases, UE 115 can determine an implicit TRP index, which can reduce signaling overhead and network congestion. In other examples, an explicit TRP index that can be used to select a default PLRS resource can be provided to the UE.

[0108] Figure 2A and Figure 2B Examples of wireless communication systems 201 and 202 supporting PLRS for multi-panel uplink transmissions according to aspects of the present disclosure are shown, respectively. In some examples, the wireless communication systems 201 and 202 can implement aspects of the wireless communication system 100. For example, the wireless communication systems 201 and 202 can include a UE 115 and a base station 105 that support a multi-panel / multi-TRP communication scheme, where one or more messages including a DCI can be used to schedule multiple uplink transmissions.

[0109] The wireless communication system 201 may include a base station 105-a and a UE 115-a, which may be as described in reference Figure 1Examples of base stations 105 and UEs 115 are described. Base station 105-a can be associated with coverage area 110-a, and UE 115-a can receive control message 210 on communication link 205. Base station 105-a can be associated with multiple TRPs 215 (e.g., TRP 215-a and TRP 215-b), and multiple TRPs 215 can send control messages 210 (e.g., control message 210-a and control message 210-b) to UE 115-a using communication links 205 (e.g., communication links 205-a and 205-b). In other examples, TRP 215-a and TRP 215-b can be associated with different base stations 105.

[0110] Figure 2A The wireless communication system 201 may support a technique for determining a default PLRS resource for a multi-panel transmission based on a multi-DCI. Specifically, the UE 115-a may be configured for multiple uplink transmissions (e.g., PUSCH, PUCCH, SRS), and the UE 115-a may determine a default PLRS resource 220 for a PLRS transmission associated with the multiple uplink transmissions. For example, the UE 115-a may receive a control message 210-a (e.g., a first DCI) for an uplink transmission (e.g., a first PUSCH) scheduled to the TRP 215-a and a control message 210-b (e.g., a second DCI) for an uplink transmission (e.g., a second PUSCH) scheduled to the TRP 215-b. The UE 115-a may receive the control message 210-a on the communication link 205-a and the control message 210-b on the communication link 205-b. In some examples, UE 115-a may not be configured with some configuration information for a particular PLRS resource (e.g., within a time period), or UE 115-a may lose such configuration information. As a result, UE 115-a may, for example, determine some default PLRS resources 220 (e.g., PLRS resource 220-a and PLRS resource 210-b) for transmitting one or more PLRS to TRPs 215-a and 215-b on respective beams corresponding to the first uplink transmission and the second uplink transmission.

[0111] The PLRS resources determined by the UE 115-a may be beam-specific and may be based on the TRP index of the corresponding TRP 215. In addition, the UE 115-a may determine the default PLRS resources based on the resource selection rules and the determination of whether the PLRS is configured (e.g., via RRC or other signaling). The UE 115-a may determine the default PLRS resources 220-a based on the TRP index of the TRP 215-a, and determine the default PLRS resources 220-b based on the TRP index of the TRP 215-b. For example, the UE 115-a may determine the default PLRS resources 220-a based on the lowest PLRS identifier (e.g., the lowest ID of "PUSCH-PathlossReferenceRS-Id") associated with the TRP index of the TRP 215-a, and may determine the default PLRS resources 220-b based on the lowest PLRS identifier associated with the TRP index of the TRP 215-b. Additionally, the resource selection rules may include an identification of the format of the DCI provided to the UE 115-a, whether the DCI includes certain fields, and / or whether additional RRC configurations are provided to the UE 115-a.

[0112] As an example, UE 115-a may be configured with multiple PLRSs (e.g., a "PUSCH-PathlossReferenceRS-Id" configuration) via higher layer signaling, and multi-panel transmissions of the PUSCH may be scheduled by multiple control messages 210 (e.g., multiple DCIs). PUSCH transmissions may be scheduled by DCI format "0_0" associated with a TRP index, and spatial settings for PUCCH transmissions associated with the same TRP index may not be provided to UE 115-a. In another example, PUSCH transmissions may be scheduled by DCI format "0_1" associated with a TRP index, and the DCI may not indicate a PLRS for the PUSCH transmission (e.g., a sounding reference signal (SRS) resource indicator (SRI) field may not be included). In another example, a power control configuration associated with a TRP index (e.g., a "SRI-PUSCH-PowerControl" configuration that maps a set of PLRSs to a set of SRI code points in the DCI) may not be provided to UE115-a. In such an example, UE 115-a can determine the PLRS resource index that has a corresponding “PUSCH-PathlossReferenceRS-Id” value that is equal to the lowest ID associated with the TRP index, where the PLRS resource is located on the serving cell, or if provided, on the serving cell indicated by the value of the linking configuration (e.g., “pathlossReferenceLinking”).

[0113] In some other examples, UE 115-a may determine the default PLRS resource 220-a based on control message 210-a (e.g., DCI) and determine the default PLRS resource 220-b based on control message 210-b (e.g., DCI), for example when transmitting a PUSCH. UE 115-a may also determine that control message 210-a corresponds to a TRP index of TRP 215-a and that control message 210-b corresponds to a TRP index of TRP 215-b. In this case, UE 115-a may determine the default PLRS resource 220-a based on a CORESET ID (e.g., the lowest CORESET ID) associated with the TRP index of TRP 215-a and corresponding to a TCI state indicating “QCL-TypeD”, and UE 115-a may determine the default PLRS resource 220-b based on a lowest ID CORESET associated with the TRP index of TRP 215-b and corresponding to a TCI state indicating “QCL-TypeD”.

[0114] In other words, UE 115-a can be configured with a default beam configuration (e.g., "enableDefaultBeamPlForPUSCH0_0"), where the beam used for uplink transmission is not explicitly indicated, and communicates with base station 105-a via a scheduling cell. UE 115-a can receive multiple control messages 210 (e.g., multiple DCIs) and send one or more uplink signals (e.g., via PUSCH) based on the control messages 210. For example, PUSCH transmission can be scheduled via DCI format "0_0" associated with a TRP index, and PUCCH resources for an active uplink BWP associated with the TRP index may not be provided to the UE. In the same example, additional RRC configuration information (e.g., "enableDefaultBeamPlForPUSCH0_0") can be provided to UE 115-a. UE 115-a may determine a PLRS resource index for providing periodic reference signal resources with "QCL-TypeD" in a TCI state, or using a QCL assumption of a CORESET with the lowest index associated with the TRP index in the active downlink BWP of the scheduling cell of the serving cell. In some examples, DCI format 0_0 may not schedule multiple TRP transmissions as a single DCI.

[0115] In other examples of determining default PLRS resources based on the TRP index and resource selection rules, for example, when sending data on the PUSCH, the UE 115-a can be configured to have a default beam configuration (e.g., enableDefaultBeamPlForPUSCH0_0) and communicate with the base station 105-a via (primary cell). The UE 115-a can receive multiple control messages 210 (e.g., multiple DCIs) and send one or more uplink signals (e.g., PUSCH) based on the control messages 210. For example, the PUSCH transmission can be scheduled by the DCI format "0_0" associated with the TRP index. In the same example, the UE 115-a may not be provided with a spatial setting of the PUCCH resources associated with the TRP index on the active UL BWP of the primary cell. In addition, the configuration "enableDefaultBeamPlForPUSCH0_0" may be provided to the UE 115-a. Here, the UE may determine a PLRS resource index that provides a periodic reference signal resource with "QCL-TypeD" in a TCI state, or a QCL assumption of a CORESET with the lowest index associated with a TRP index in an active downlink BWP of the primary cell. In other words, UE 115-a may determine default PLRS resources 220-a and 220-b based on periodic reference signal resources, where the resources may be determined using a spatial QCL relationship (e.g., "QCL-TypeD") in a TCI state associated with a CORESET monitored by UE 115-a (or using a QCL assumption). In this case, multiple CORESETs may correspond to the same pool index, and UE 115-a may rely on the QCL relationship of a CORESET with an index associated with a TRP index (e.g., the lowest index) when determining the default PLRS resources, where the QCL relationship of the CORESET may indicate uplink resources for the corresponding PLRS.

[0116] In some cases, UE 115-a may be configured with multiple power control identifiers (e.g., “sri-PUSCH-PowerControlId”) that map a set of power control parameters such as a PLRS identifier (e.g., “PUSCH-PathlossReferenceRS-Id”) to a set of SRI code points in the DCI, and if the DCI does not indicate an SRI code point, UE 115-a may use the mapping to determine a default PLRS resource 220-a and a default PLRS resource 220-b. For example, UE 115-a may determine the default PLRS resource 220-a based on the lowest value of “PUSCH-PathlossReferenceRS-Id” associated with the TRP index of TRP 215-a, where the lowest value of “PUSCH-PathlossReferenceRS-Id” is identified based on the mapping. UE 115-a may determine the default PLRS resource 220-b based on a lowest value of "PUSCH-PathlossReferenceRS-Id" associated with a TRP index of TRP 215-b, wherein the lowest value of "PUSCH-PathlossReferenceRS-Id" is identified based on a mapping.

[0117] In other words, using the resource selection rules (e.g., mapping between configuration parameters) and the corresponding TRP indexes of TRP215-a and 215-b, UE 115-a can select a default PLRS resource for sending PLRS when sending data on PUSCH. In this case, multiple control messages 210-a and 210-b may correspond to DCI and may not indicate SRI (e.g., excluding the SRI field) of a dynamic grant (DG) or a configuration grant (CG) for PUSCH (i.e., PUSCH may be associated with a DG or CG communication scheme, where in the case of a CG scheme, the DCI of the control message 210 may or may activate a triggering PUSCH transmission). If UE115-a is provided with "enablePLRSupdateForPUSCHSRS", UE 115-a can accordingly identify or infer a mapping between configured identifier values ​​(e.g., between "sri-PUSCH PowerControlId" and "PUSCH-PathlossReferenceRS-Id" values ​​associated with the TRP index), where the mapping can be updated by MAC-CE. For a PUSCH transmission associated with a TRP index that is scheduled by a control message 210 (e.g., DCI) format that does not include an SRI field associated with the TRP index, or for a PUSCH transmission associated with a TRP index that is configured by "ConfiguredGrantConfig" and activated by a DCI format that does not include an SRI field associated with the TRP index, UE 115-a may determine the PLRS resource index based on the "PUSCH-PathlossReferenceRS-Id" mapped to the "sri-PUSCH-PowerControlId", e.g., the lowest identifier value associated with the TRP index. Note that although the lowest index or identifier may be used in the examples described herein, any index or identifier value may be used when selecting a default resource.

[0118] In some cases, UE 115-a may determine the default PLRS resource 220-a based on control message 210-a (e.g., DCI) and determine the default PLRS resource 220-b based on control message 210-b (e.g., DCI). UE 115-a may also determine that control message 210-a corresponds to TRP 215-a and that control message 210-b corresponds to TRP 215-b. In some examples, UE 115-a may determine the default PLRS resource 220-a based on a lowest ID CORESET associated with a TRP index of TRP 215-a and having a TCI state indicating “QCL-TypeD”, and UE 115-a may determine the default PLRS resource 220-b based on a lowest ID CORESET associated with a TRP index of TRP 215-b and corresponding to a TCI state indicating “QCL-TypeD”, where the two lowest ID CORESETs may be provided in an active downlink BWP of UE 115-a. In some other examples, UE 115-a may determine a default PLRS resource 220-a based on a lowest ID active PDSCH TCI state associated with the TRP index of TRP 215-a and indicating “QCL-TypeD,” and UE 115-a may determine a default PLRS resource 220-b based on a lowest ID active PDSCH TCI state associated with the TRP index of TRP 215-b and indicating “QCL-TypeD,” wherein a CORESET associated with the TRP indexes of TRP 215-a and 215-b is not provided in the active DL BWP of UE 115-a.

[0119] In such an example, when data is transmitted on the PUSCH, the multiple control messages 210-a and 210-b may correspond to a DCI that does not include an SRI field associated with the TRP index of the TRP 215, and the UE 115-a may not be configured with a "PUSCH-PathlossReferenceRS-Id." For a PUSCH transmission associated with a TRP index scheduled by a DCI format that does not include an SRI field associated with the TRP index, or for a PUSCH transmission associated with a TRP index configured, for example, by “ConfiguredGrantConfig” and activated by a DCI format that does not include an SRI field associated with the TRP index, if CORESETs associated with two TRP indices (e.g., a TRP index of TRP 215-a and a TRP index of TRP 215-b) are provided in an active downlink BWP, UE 115-a may determine a PLRS resource index for providing a periodic reference signal resource with “QCL-TypeD” in a TCI state using the QCL assumption of the CORESET with the lowest index associated with the TRP index. In another example, if a CORESET associated with the TRP index is not provided in the active DL BWP, UE 115-a may determine a PLRS resource index for providing a periodic reference signal resource with “QCL-TypeD” that is an active PDSCH TCI state with the lowest ID associated with the TRP index.

[0120] Figure 2BThe wireless communication system 202 may support techniques for determining default PLRS resources for multi-panel transmissions based on a single DCI. The base station 105-b may be associated with the coverage area 110-b, and the UE 115-b may receive a control message 210-c on the communication link 205-c. The base station 105-a may also be associated with multiple TRPs 215, and the multiple TRPs 215 may send the control message 210-c to the UE 115-b using the communication link 205-c. As discussed herein, the TRPs 215-a and 215-b may additionally or alternatively be associated with different base stations 105. In some cases, the UE 115-b may be configured for multiple uplink transmissions from different antenna panels, and the UE 115-b may determine the default PLRS resources 220 for the multiple PLRS transmissions associated with the multiple uplink transmissions. For example, UE 115-b may receive a control message 210-c (e.g., DCI) scheduling an uplink transmission to TRP 215-c (e.g., a first PUSCH) and an uplink transmission to TRP 215-d (e.g., a second PUSCH). UE 115-b may determine a default PLRS resource 220-c based on a TRP index corresponding to TRP 215-c and determine a default PLRS resource 220-d based on a TRP index corresponding to TRP 215-d. In this way, the PLRS resources determined by UE 115-b may be beam-specific and may be based on the TRP index of the corresponding TRP 215. In addition, UE 115-a may determine the default PLRS resources based on a resource selection rule and a determination of whether PLRS is configured (e.g., via RRC signaling).

[0121] In one example, when sending data on the PUSCH, UE 115-b can determine the default PLRS resource 220-c based on mapping the SRI field value of the control message 210-c associated with the TRP index of TRP 215-c to the configured value of multiple PLRS (e.g., "PUSCH-PathlossReferenceRS-Id"), and UE 115-b can determine the default PLRS resource 220-d based on mapping the SRI field value of the control message 210-c associated with the TRP index of TRP 215-d to the value of "PUSCH-PathlossReferenceRS-Id". In some other cases, UE 115-b may determine the default PLRS resource 220-c based on the lowest value of “PUSCH-PathlossReferenceRS-Id” associated with the TRP index of TRP 215-c, and UE 115-b may determine the default PLRS resource 220-d based on the lowest value of “PUSCH-PathlossReferenceRS-Id” associated with the TRP index of TRP 215-d.

[0122] In this case, the control message 210-c may correspond to a DCI that may or may not indicate an SRI, and in some other examples, the control message 210-c may correspond to a DCI that activates a CG PUSCH transmission. For a PUSCH transmission associated with a TRP index configured by a CG configuration (e.g., “ConfiguredGrantConfig”), the CG configuration may not include additional configuration information (e.g., “rrc-ConfiguredUplinkGrant”), and the UE 115-b may determine the PLRS resource index based on the value of “PUSCH-PathlossReferenceRS-Id”, which may be mapped to an SRI field value associated with the TRP index in the DCI format that activates the PUSCH transmission. In the event that the DCI format activating PUSCH transmission may not include an SRI field associated with a TRP index, UE 115-b may determine the PLRS resource index having a corresponding “PUSCH-PathlossReferenceRS-Id” value equal to the lowest value associated with the TRP index, where the reference signal resource is located on the serving cell, or if provided, on the serving cell indicated by the value of the linking configuration (e.g., “pathlossReferenceLinking”).

[0123] In another example, when sending a PUSCH to each TRP 215, the UE 115-b may determine the default PLRS resources 220-c and 220-d based on the TCI state within the TCI code point, wherein the TCI state may have a lowest ID associated with the corresponding TRP index and further correspond to a pair of TCI states, and the default PLRS resources 220-c and 220-d may be periodic resources with a QCL relationship (e.g., "QCL-TypeD"). For example, the default PLRS resource 220-c may be a periodic resource based on a TCI state corresponding to a TCI code point (e.g., indicating multiple TCI states), and the default PLRS resource 220-d may also be a periodic resource based on a TCI state corresponding to the TCI code point. In some examples, the control message 210-c may correspond to a DCI that does not include an SRI field associated with a TRP index corresponding to the TRP 215, and the UE 115-b may not be configured with a "PUSCH-PathlossReferenceRS-Id". For PUSCH transmissions associated with a TRP index scheduled by a DCI format that may not include an SRI field associated with the TRP index, or PUSCH transmissions associated with a TRP index configured with “ConfiguredGrantConfig” and activated by a DCI format that may not include an SRI field associated with the TRP index, if CORESET is not provided in the active DL BWP of UE 115-b, UE 115-b may determine a PLRS resource index that provides a reference signal resource with “QCL-TypeD” in an active PDSCH TCI state associated with a TRP index in a TCI code point having a lowest ID in a pair of TCI states. In some examples, if a CORESET is provided in the active downlink BWP, UE 115 may determine the PLRS resource index of the periodic reference signal resource with "QCL-TypeD" provided in the TCI state using the QCL assumption of the CORESET with the lowest index associated with the TRP index, and if a CORESET associated with the TRP index is not provided in the active BWP, UE 115 may additionally determine the PLRS based on the active TCI state with the lowest ID associated with the TRP index.

[0124] Although the above examples describe aspects of determining default PLRS resources associated with PUSCH transmissions, for example in multi-DCI and single DCI schemes for multi-panel transmissions, UE 115-a and UE 115-b may also determine default PLRS resources associated with other uplink transmissions (such as, PUCCH, SRS, etc.). For example, UE 115-b may receive control message 210-c (e.g., DCI) scheduling uplink transmissions to TRP 215-c (e.g., a first PUCCH) and uplink transmissions to TRP 215-d (a second PUCCH). Additionally or alternatively, UE 115-a may receive control message 210-a (e.g., a first DCI) and receive control message 210-b (e.g., a second DCI) that provide different uplink transmissions of control information to TRP 215-a and TRP 215-b via PUCCH (e.g., from respective UE antenna panels). In either case, UE 115 - a and UE 115 - b may determine the default PLRS resources 220 based on the TRP index of the corresponding TRP 215 .

[0125] In one example, the UE 115 may transmit one or more PLRS associated with the PUCCH, and the UE 115 may determine a default PLRS resource for PLRS transmission. For example, the UE 115 may receive one or more control messages 210 scheduling uplink transmissions to multiple TRPs 215. The UE 115 may determine that the control message 210 corresponds to a TRP index of the TRP 215. In some examples, the UE 115 may determine multiple PLRS resources 220 based on the control message 210, while in some other examples, the UE 115 may determine a first PLRS resource 220 based on a first control message 210, and determine a second PLRS resource 220 based on a second control message 210. In either case, UE 115-b may determine PLRS resource 220-a based on the lowest identifier of “PUCCH-PathlossReferenceRS” associated with the TRP index of TRP 215-a (e.g., the TRP index indicated in control message 210-a), and UE 115-b may determine PLRS resource 220-b based on the lowest identifier of “PUCCH-PathlossReferenceRS” associated with the TRP index of TRP 215-b (e.g., the TRP index indicated in control message 210-b). In other words, UE 115 may be provided with the RRC configuration “PathlossReferenceRS”, but may not be provided with additional RRC configuration information (e.g., “PUCCH-SpatialRelationInfo”) for the PUCCH associated with the TRP index of TRP 215. The UE 115 may obtain the "PL-referenceSignal" value in the "PUCCH-PathlossReferenceRS" from the "PUCCH-PathlossReferenceRS-Id" with the lowest index ID associated with the TRP index in the "PUCCH-PathlossReferenceRS", where the reference signal resource is located on the same serving cell, or if provided, on the serving cell indicated by the "pathlossReferenceLinking" value. In this case, the UE 115 may utilize other configurations when determining which resources to use for the default PLRS resources 220.

[0126] In some cases, the UE 115 may determine the default PLRS resource 220 based on the control message 210. The UE 115 may also determine that the control message 210 corresponds to a TRP index of the TRP 215. In some examples, the UE 115 may determine the default PLRS resource 220 based on the lowest ID CORESET associated with the TRP index of the TRP 215 and corresponding to the TCI state indicating "QCL-TypeD". For example, when sending PUCCH using multi-panel transmission, the UE 115 may not be provided with the configuration "PathlossReferenceRS", and the UE 115 may also not be provided with "PUCCH-SpatialRelationInfo". In this example, the UE 115 may also not be provided with additional configuration information "enableDefaultBeamPlForPUCCH". As a result, the UE 115 may determine a PLRS resource index that provides a periodic reference signal resource with "QCL-TypeD" in the TCI, or use the QCL assumption of the CORESET with the lowest index associated with the TRP index in the active DL BWP of the primary cell.

[0127] In some cases, UE 115 may transmit PLRS associated with SRS to multiple TRPs 215, and UE 115 may determine a default PLRS resource 220 for uplink transmission of the SRS. In some examples, UE 115 may calculate path loss using the default PLRS resource 220 obtained from a synchronization signal (SS) and / or physical broadcast channel (PBCH) block used to obtain a master information block (MIB) associated with a TRP index of TRP 215. For example, UE 115-b may receive a first MIB associated with TRP 215-c on a first communication resource and a second MIB associated with TRP 215-d on a second communication resource, and UE 115-b may determine the default PLRS resource 220-c based on the first communication resource and determine the default PLR resource 220-d based on the second communication resource. In some examples, the "PathlossReferenceRS" or "SRS-PathlossReferenceRS" for the SRS associated with the TRP index may not be provided to the UE 115, or before providing dedicated higher layer parameters to the UE 115, the UE 115 may use the PLRS resource index obtained from the SS / PBCH block to calculate the path loss, which the UE 115 uses to obtain the MIB associated with the TRP index.

[0128] In some cases, the UE 115 may determine the default PLRS resource 220 based on the one or more control messages 210, and the UE 115 may also determine that the control message 210 corresponds to a TRP index of the TRP 215. In some examples, the UE 115 may determine the default PLRS resource 220 based on the lowest ID CORESET associated with the TRP index of the TRP 215 and corresponding to a TCI state indicating "QCL-TypeD". In some other examples, the UE 115 may determine the default PLRS resource 220 based on the lowest ID active PDSCH TCI state associated with the TRP index of the TRP 215 and indicating "QCL-TypeD". In some other examples, the UE 115 may determine the default PLRS resource 220 based on a TCI code point having a lowest ID associated with the TRP index and corresponding to a pair of TCI states indicating "QCL-TypeD".

[0129] The UE 115 may determine a default PLRS resource 220 for SRS transmission to multiple TRPs 215. In some examples, "PathlossReferenceRS" or "SRS-PathlossReferenceRS" may not be provided to the UE 115. In the same example, the UE 115 may not be provided with "spatialRelationInfo", while the UE 115 may be provided with "enableDefaultBeamPlForSRS". In some cases, the UE 115 may determine to provide a reference signal resource index of a periodic reference signal resource with "QCL-TypeD" in a TCI state, or to use a QCL assumption of a CORESET with a lowest index associated with a TRP index, such as if a CORESET associated with a TRP index is provided in an active downlink BWP. In some other cases, UE 115 may determine a reference signal resource index for a periodic reference signal resource with "QCL-TypeD" provided in an active PDSCH TCI state associated with a TRP index or in a TCI code point with the lowest ID among a pair of TCI states (if CORESET is not provided in the active downlink BWP).

[0130] In some cases, the UE 115 may determine the default PLRS resource 220 of the PLRS corresponding to the uplink signal (e.g., PUSCH, PUCCH, SRS) associated with the TRP 215, where the PLRS may not be configured (e.g., by the network) using multi-panel transmission based on a single DCI. In this case, the UE 115 may determine the default PLRS resource based on the TCI state information and / or the predetermined mapping. For example, the UE 115 may select a plurality of periodic reference signals separately from the first and second TCIs. In such a case, the TCI state of the first value of all 2-TCI pairs (e.g., the TCI state with the lowest ID) may be selected for the first TRP 215, and the TCI state of the second value of all 2-TCPI pairs (e.g., the TCI state with the lowest ID) may be selected for the second TRP 215. In some other examples, the UE 115 may select a plurality of periodic reference signals from the 2-TCI pairs. The UE 115 may select a pair of TCI states with the sum of the lowest or highest TCI state IDs as the periodic reference signal. UE 115 may select a pair of TCI states corresponding to a first TCI code point having two TCIs as a periodic reference signal. In some other examples, UE 115 may select a primary default PLRS and a secondary default PLRS as indicated in a standard protocol (e.g., Release 15) based on a predetermined mapping. The predetermined mapping may be based on an existing 2-TCI pair. For example, if the primary default PLRS corresponds to one TCI in any 2-TCI pair, the secondary default PLRS may correspond to the other TCI states of the same TCI pair.

[0131] Figure 3 An example of a process flow 300 for supporting PLRS for multi-panel uplink transmissions according to aspects of the present disclosure is shown. In some examples, the process flow 300 can implement aspects of the wireless communication system 100. The process flow 300 includes a UE 115-c, a base station 105-c, which can be a reference Figure 1 , Figure 2A and Figure 2B Examples of corresponding devices described. UE 115-c can determine default PLRS resources for TRP 305-a and TRP 305-b to improve network efficiency and reduce latency. The following alternative examples can be implemented in which some steps are performed in an order different from the order described, or the steps are not performed at all. In some cases, the steps may include additional features not mentioned below, or other steps may be added. Processing flow 300 can support techniques for default reference signal resource selection for transmission of PLRS associated with various signals (e.g., via PUCCH, via PUSCH, SRS, or the like).

[0132] UE 115-c and base station 105-c can support a multi-panel / multi-TRP communication scheme, in which a first transmission of a signal sent to a first TRP 305-a can be sent using a first panel of UE 115-c. In addition, a second transmission of a signal sent to a second TRP 305-b can be sent using a second panel of UE 115-c. Multiple transmissions can be scheduled or activated by one or more DCIs from base station 105-c (such as in the case of a CG scheme). Therefore, at 307, base station 105-c can send one DCI or multiple DCIs for multiple uplink transmissions, and UE 115-c can receive one DCI or multiple DCIs for multiple uplink transmissions. Specifically, one DCI can schedule uplink transmissions to corresponding TRPs 305-a and 305-b on multiple UE antenna panels. Alternatively, different DCIs can schedule corresponding link transmissions to corresponding TRPs 305-a and 305-b on multiple UE antenna panels.

[0133] At 310, UE 115-c may identify respective TRP index values ​​corresponding to a first TRP (e.g., TRP 305-a) and a second TRP (e.g., TRP 305-b). UE 115-c may be configured at least for transmission of uplink signals (e.g., PUSCH, PUCCH, SRS, etc.) to the first TRP 305-a using a first antenna panel and for a second transmission of uplink signals to the second TRP 305-b using a second antenna panel different from the first antenna panel.

[0134] At 315, the UE 115-c may determine whether PLRS is configured in the system. For example, the UE 115-c may receive various configurations that may configure at least one set of PLRS. However, the configuration may not indicate PLRS resources for transmitting one or more PLRS associated with the uplink signal. In other cases, the UE 115-c may not have a configuration for PLRS.

[0135] In addition, even in the case where PLRS is configured (e.g., via RRC signaling), at 320, it can be determined whether the DCI or additional signaling (e.g., RRC signaling) indicates PLRS resources for sending one or more PLRS. In some examples, the DCI or other signaling may not provide additional configuration. For example, the DCI format may not include an SRI field associated with a TRP index. Additionally or alternatively, UE 115-c may not be provided with a beam configuration or spatial setting for uplink resources. In other examples, UE 115-c may not have a power control configuration. In any case, UE 115-c can still send PLRS to TRP 305-a and TRP 305-b by determining some default PLRS resources based on the TRP index of TRP 305.

[0136] At 315, the UE 115-c may determine a default PLRS resource for one or more PLRSs associated with the first transmission and the second transmission of the uplink signal. The UE 115-c may determine the default PLRS resource based on a determination of whether the PLRS is configured (e.g., whether a “PathlossReferenceRS-Id” is configured), a corresponding TRP index value, and a resource selection rule (e.g., selecting a PLRS resource based on the highest resource ID, selecting a PLRS resource based on a downlink resource and a QCL relationship, selecting a PLRS resource based on a mapping, etc.).

[0137] At 320, UE 115-c transmits one or more PLRS using default PLRS resources. For example, UE 115-c may transmit a first PLRS of one or more PLRS using PLRS resources associated with the TRP index of TRP 305-a, and transmit a second PLRS of one or more PLRS using PLRS resources associated with the TRP index of TRP 305-b. In some cases, the default PLRS resources may be determined based on resources indicated by or associated with a control message (e.g., DCI, MAC CE, etc.). Determining the default PLRS resources may reduce signaling overhead and reduce configuration time for UE 115.

[0138] Figure 4 A block diagram 400 of a device 405 supporting a default path loss reference signal for multi-panel uplink transmission according to aspects of the present disclosure is shown. The device 405 can be an example of aspects of a UE 115 as described herein. The device 405 can include a receiver 410, a communication manager 415, and a transmitter 420. The device 405 can also include a processor. Each of these components can communicate with each other (e.g., via one or more buses).

[0139] Receiver 410 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 a default path loss reference signal for multi-panel uplink transmissions, etc.). The information may be passed to other components of device 405. Receiver 410 may be a reference Figure 7 Examples of aspects of transceiver 720 are described. Receiver 410 may utilize a single antenna or a group of antennas.

[0140] The communication manager 415 may identify (e.g., for a UE) corresponding TRP index values ​​corresponding to a first TRP and a second TRP. In some cases, the UE may be configured to at least send a first transmission of an uplink signal to a first TRP using a first antenna panel and a second transmission of an uplink signal to a second TRP using a second antenna panel different from the first antenna panel (e.g., multi-panel / multi-TRP communication). In some cases, the communication manager 415 may determine a default PLRS resource for one or more PLRS associated with the first and second transmissions of the uplink signal, the default PLRS resource being based on whether the PLRS is configured, the corresponding TRP index value, and a determination of a resource selection rule. In some examples, the communication manager 415 may send one or more PLRS using a default PLRS resource. The communication manager 415 may be an example of various aspects of the communication manager 710 described herein.

[0141] The communication manager 415 or its subcomponents may be implemented in hardware, in code (e.g., software or firmware) executed by a processor, or any combination thereof. If implemented in code executed by a processor, the functions of the communication manager 415 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 herein.

[0142] The communication manager 415 or its subcomponents can be physically located in various locations, including being distributed so that a portion of the functionality is implemented by one or more physical components at different physical locations. In some examples, the communication manager 415 or its subcomponents can be separate and distinct components according to various aspects of the present disclosure. In some examples, the communication manager 415 or its subcomponents can be combined with one or more other hardware components, including but not limited to input / output (I / O) components, a transceiver, a network server, another computing device, one or more other components described in the present disclosure, or a combination thereof according to various aspects of the present disclosure.

[0143] Transmitter 420 can transmit signals generated by other components of device 405. In some examples, transmitter 420 can be collocated with receiver 410 in a transceiver module. For example, transmitter 420 can be a reference Figure 7 Examples of aspects of the transceiver 720 are described. The transmitter 420 may utilize a single antenna or a group of antennas.

[0144] The communication manager 415 may be implemented as an integrated circuit or chipset of the device 405, and the receiver 410 and the transmitter 420 may be implemented as analog components (e.g., amplifiers, filters, antennas) coupled to the device 405 modem to implement wireless transmission and reception. The actions performed by the communication manager 415 as described herein may be implemented to achieve one or more potential advantages. At least one implementation may enable the communication manager 415 to determine the resource index of the resource to be used when the configuration of the PLRS does not exist or does not specify which resources to use. Based on the technology for selecting the default and / or fallback PLRS resources described herein, one or more processors of the device 405 (e.g., controlling the communication manager 415 or (multiple) processors in conjunction with the communication manager) may promote improvements in signaling reliability, and in some examples, may promote reduced power consumption, increased data rates, and enhanced efficiency of high reliability and low latency operations, as well as other benefits generated by ensuring that the PLRS can be efficiently transmitted by the UE. In addition, the communication manager 415 may increase the available battery power, communication quality, and data throughput at the wireless device (e.g., UE 115) by supporting the determination of the default PLRS resources for multi-TRP transmission. For example, as described herein, by providing a technique for quickly determining PLRS resources without performing additional control signaling with a base station (e.g., base station 105) to configure PLRS resources, the determination of default PLRS resources can increase data throughput and reduce delays associated with multi-TRP transmissions. Based on determining the default PLRS resources, the increase in data throughput can result in improved link performance and reduced signaling overhead. Therefore, the communication manager 415 can save power and increase battery life at a wireless device (e.g., UE 115) by strategically improving the communication quality at the wireless device (e.g., UE 115).

[0145] Figure 5 A block diagram 500 of a device 505 supporting a default path loss reference signal for multi-panel uplink transmission according to aspects of the present disclosure is shown. The device 505 may be an example of aspects of the device 405 or UE 115 as described herein. The device 505 may include a receiver 510, a communication manager 515, and a transmitter 535. The device 505 may also include a processor. Each of these components may communicate with each other (e.g., via one or more buses).

[0146] 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 a default path loss reference signal for multi-panel uplink transmissions, etc.). The information may be passed to other components of device 505. Receiver 510 may be a reference Figure 7 Examples of aspects of transceiver 720 are described. Receiver 510 may utilize a single antenna or a group of antennas.

[0147] Communications manager 515 may be an example of aspects of communications manager 415 described herein. Communications manager 515 may include configuration manager 520, reference signal resource manager 525, and schedule manager 530. Communications manager 515 may be an example of aspects of communications manager 710 described herein.

[0148] The configuration manager 520 may identify (e.g., for the UE) respective TRP index values ​​corresponding to the first TRP and the second TRP. In some cases, the UE may be configured to at least send a first transmission of an uplink signal to the first TRP using a first antenna panel and send a second transmission of an uplink signal to the second TRP using a second antenna panel different from the first antenna panel. That is, the configuration manager 520 may identify the TRP index value of the TRP used in the case where the UE is configured for or supports a multi-TRP / multi-panel communication scheme.

[0149] The reference signal resource manager 525 may determine a default PLRS resource for one or more PLRSs associated with a first transmission and a second transmission of an uplink signal, the default PLRS resource being based on a determination of whether PLRS is configured, a corresponding TRP index value, and a resource selection rule.

[0150] The schedule manager 530 may use the default PLRS resources to transmit one or more PLRS.

[0151] Transmitter 535 can transmit signals generated by other components of device 505. In some examples, transmitter 535 can be collocated with receiver 510 in a transceiver module. For example, transmitter 535 can be a reference Figure 7 Examples of aspects of the transceiver 720 are described. The transmitter 535 may utilize a single antenna or a group of antennas.

[0152] Figure 6A block diagram 600 of a communication manager 605 supporting a default path loss reference signal for multi-panel uplink transmissions according to aspects of the present disclosure is shown. The communication manager 605 can be an example of aspects of the communication manager 415, the communication manager 515, or the communication manager 710 described herein. The communication manager 605 can include a configuration manager 610, a reference signal resource manager 615, a scheduling manager 620, and a resource set manager 625. Each of these modules can communicate with each other directly or indirectly (e.g., via one or more buses).

[0153] The configuration manager 610 can identify corresponding TRP index values ​​corresponding to the first TRP and the second TRP, wherein the communication manager 605 can be configured to at least send a first transmission of an uplink signal to the first TRP using a first antenna panel and send a second transmission of an uplink signal to the second TRP using a second antenna panel different from the first antenna panel.

[0154] In some examples, configuration manager 610 may determine that the PLRS is configured via RRC signaling. In some examples, configuration manager 610 may determine that the DCI or additional RRC signaling associated with the corresponding TRP index value excludes configuration information for sending one or more default PLRS.

[0155] In some examples, the configuration manager 610 may determine that the PLRS is not configured via RRC signaling. In some examples, the configuration manager 610 may determine that the DCI excludes configuration information for sending one or more default PLRS, the configuration information including the SRI field. In some examples, the configuration manager 610 may identify a set of TCI states for a physical downlink shared channel, wherein the DCI is part of a multi-DCI scheme for scheduling a first transmission and a second transmission of an uplink signal.

[0156] In some examples, configuration manager 610 may identify a transmission configuration identifier (e.g., a TCI state ID) associated with a corresponding TRP index value from a set of TCI states. In some examples, configuration manager 610 may identify a set of TCI states for a PDSCH, where the DCI is part of a single DCI scheme for scheduling a first transmission and a second transmission of an uplink signal.

[0157] In some examples, the configuration manager 610 may identify a transmission configuration identifier associated with a corresponding TRP index value from a set of TCI states, wherein each transmission configuration identifier is within a TCI code point of a pair of TCI states. In some examples, the configuration manager 610 may determine that the additional RRC signaling associated with the corresponding TRP index value excludes configuration information for sending one or more default PLRSs, the configuration information including spatial relationship information.

[0158] In some examples, the configuration manager 610 may determine that additional RRC signaling associated with the corresponding TRP index value excludes configuration information for sending one or more default PLRS, which is used for the detection reference signal associated with the corresponding TRP index value. In some examples, the configuration manager 610 may determine that one or more higher layer parameters are not received at the UE. In some examples, the configuration manager 610 may identify a set of TCI states for the PDSCH. In some cases, the DCI is part of a multi-DCI scheme for scheduling a first transmission and a second transmission of an uplink signal. In some cases, the transmission configuration identifier has a lowest value of the TCI code point of a pair of TCI states.

[0159] The reference signal resource manager 615 may determine a default PLRS resource for one or more PLRSs associated with the first transmission and the second transmission of the uplink signal, the default PLRS resource being based on whether the PLRS is configured, the corresponding TRP index value, and the resource selection rule. In some examples, the reference signal resource manager 615 may select the default PLRS resource based on the resource selection rule and the corresponding TRP index value based on the PLRS being configured and the configuration information being excluded.

[0160] In some examples, the reference signal resource manager 615 may identify a PLRS identifier value (e.g., PathlossReferenceRS-Id) associated with a corresponding TRP index value. In some cases, the PathlossReferenceRS-Id may be a lowest ID value in a set of ID values. In some examples, the reference signal resource manager 615 may select a default PLRS resource based on the PLRS identifier value, wherein the selected default PLRS resource includes resources of the serving cell.

[0161] In some examples, the reference signal resource manager 615 may select a default PLRS resource based on a CORESET pool index value, where the default PLRS resource comprises a periodic resource selected based on a spatial QCL relationship associated with an identified CORESET.

[0162] In some examples, the configuration manager 610 may determine that the configuration information excluded from the DCI includes an SRI field associated with a corresponding TRP index value. In this case, the reference signal resource manager 615 may identify a mapping between a power control identifier value and a PLRS identifier value associated with the corresponding TRP index value. In some examples, the reference signal resource manager 615 may select a default PLRS resource based on the PLRS identifier value and according to the mapping.

[0163] In some examples, the configuration manager 610 may determine that the configuration information excluded from the additional RRC signaling includes an uplink configuration grant parameter, wherein the format of the DCI may activate a first transmission and a second transmission of an uplink signal. In some examples, the reference signal resource manager 615 may identify a mapping between an SRI field associated with a corresponding TRP index value and a PLRS indicator value. In some examples, the reference signal resource manager 615 may select a default PLRS resource based on the PLRS identifier value and according to the mapping, wherein the selected default PLRS resource includes a resource of a serving cell.

[0164] In some examples, the configuration manager 610 may determine that the configuration information excluded from the additional RRC signaling includes one or more uplink configuration grant parameters, wherein the format of the DCI may activate a first transmission and a second transmission of an uplink signal. In this case, the reference signal resource manager 615 may identify a PLRS identifier value associated with a corresponding TRP index value. In some examples, the reference signal resource manager 615 may select a default PLRS resource based on the PLRS identifier value, wherein the selected default PLRS resource includes a resource of a serving cell.

[0165] In some examples, the reference signal resource manager 615 can select a default PLRS resource based on a resource selection rule and a corresponding TRP index value based on the PLRS not being configured and the configuration information being excluded. In some examples, the reference signal resource manager 615 can select a default PLRS resource based on a transmission configuration identifier, wherein the CORESET associated with the corresponding TRP index value is located in a downlink BWP different from the active downlink BWP.

[0166] In some examples, the reference signal resource manager 615 can select a default PLRS resource according to a resource selection rule and a corresponding TRP index value based on the PLRS being configured and the configuration information being excluded. In some examples, selecting a default PLRS resource according to the resource selection rule includes identifying a PLRS identifier value associated with the corresponding TRP index value, and selecting a default PLRS resource based on the PLRS identifier value, wherein the selected default PLRS resource includes a resource of the serving cell.

[0167] In some examples, selecting a default PLRS resource according to a resource selection rule includes identifying a set of CORESETs for monitoring DCI, identifying a CORESET from a plurality of CORESETs having a CORESET pool index value associated with a corresponding TRP index value, and selecting a default PLRS resource based on the CORESET pool index value, wherein the default PLRS resource includes a periodic resource selected based on a spatial QCL relationship associated with the identified CORESET.

[0168] In some examples, based on one or more higher layer parameters not being received, a default PLRS resource is selected according to a resource selection rule and a corresponding TRP index value, wherein selecting the default PLRS resource according to the resource selection rule includes identifying an SSB used to receive a MIB associated with the corresponding TRP index value, and selecting the default PLRS resource based on the identified SSB.

[0169] In some examples, the reference signal resource manager 615 may select a default PLRS resource based on a lowest CORESET pool index value, wherein the default PLRS resource comprises a periodic resource selected based on a spatial quasi-co-location relationship associated with the identified CORESET. In some examples, the reference signal resource manager 615 may determine that the PLRS is not configured for a first transmission and a second transmission of an uplink signal, wherein the first transmission and the second transmission of the uplink signal are based on a DCI received according to a single DCI scheme.

[0170] In some examples, the reference signal resource manager 615 may select a default PLRS resource based on the resource selection rule and the corresponding TRP index value based on the PLRS not being configured. In some examples, for a first transmission of an uplink signal, the reference signal resource manager 615 may determine a first periodic reference signal resource set based on a first TCI identifier value from a first pair of TCIs.

[0171] In some examples, for a second transmission of the uplink signal, the reference signal resource manager 615 may determine a second set of periodic reference signal resources based on a second TCI identifier value from a second pair of TCIs. In some examples, the reference signal resource manager 615 may select a default PLRS resource based on the first set of periodic reference signal resources and the second set of periodic reference signal resources.

[0172] In some examples, for the first transmission and the second transmission of the uplink signal, the reference signal resource manager 615 can determine a periodic reference signal resource set based on a pair of TCIs from a set of TCI pairs. In some examples, the reference signal resource manager 615 can select a default PLRS resource based on the periodic reference signal resource set.

[0173] In some examples, for the first transmission and the second transmission of the uplink signal, the reference signal resource manager 615 may determine a first reference signal resource set based on a single panel transmission and a second reference signal resource set based on a predefined mapping between the first reference signal resource set and the second reference signal resource set. In some examples, the reference signal resource manager 615 may select a default PLRS resource based on the first reference signal resource set or the second reference signal resource set or any combination thereof. In some cases, each PLRS identifier value includes a lowest PLRS identifier associated with a corresponding TRP index value.

[0174] In some cases, the DCI is part of a single DCI scheme for scheduling a first transmission and a second transmission of an uplink signal. In some cases, the first TCI identifier value is the lowest TCI identifier of the first pair of TCIs, and wherein the second TCI identifier value is the lowest TCI identifier of the second pair of TCIs. In some cases, the pair of TCIs has the lowest sum of TCI identifier values, or has the highest sum of TCI identifier values, or corresponds to a first TCI code point with multiple TCI states. In some cases, the predefined mapping is based on one or more pairs of TCI states. In some cases, the uplink signal includes data on a physical uplink shared channel, or control information on a physical uplink control channel, or a sounding reference signal.

[0175] The scheduling manager 620 may use the default PLRS resources to send one or more PLRS. The resource set manager 625 may identify a set of CORESETs for monitoring DCI. In some examples, the resource set manager 625 may identify a CORESET having a CORESET pool index value associated with a corresponding TRP index value from a set of CORESETs.

[0176] In some examples, the resource set manager 625 may identify a set of CORESETs for monitoring DCI, wherein the DCI is part of a multi-DCI scheme for scheduling a first transmission and a second transmission of an uplink signal. In some examples, the resource set manager 625 may identify a CORESET having a CORESET pool index value associated with a corresponding TRP index value from a set of CORESETs, wherein the identified CORESET is within an active downlink BWP.

[0177] In some examples, the resource set manager 625 may identify a set of CORESETs for monitoring DCI that is part of a single DCI scheme for scheduling a first transmission and a second transmission of an uplink signal. In some examples, the resource set manager 625 may identify a set of CORESETs for monitoring DCI.

[0178] In some examples, the resource set manager 625 may identify a CORESET having a lowest CORESET pool index value associated with a corresponding TRP index value from a set of CORESETs, wherein the identified CORESET is within an active downlink BWP. In some cases, the CORESET having the CORESET pool index value associated with the corresponding TRP index value is located in an active downlink portion of a scheduling cell. In some cases, the CORESET having the CORESET pool index value associated with the corresponding TRP index value is located in an active downlink portion of a primary cell, and wherein the configuration information excluded from the DCI includes spatial beam information about an active uplink BWP of the primary cell.

[0179] Figure 7 A diagram of a system 700 including a device 705 supporting a default path loss reference signal for multi-panel uplink transmissions according to aspects of the present disclosure is shown. The device 705 may be an example of or include components of the device 405, device 505, or UE 115 described herein. The device 705 may include components for two-way voice and data communications, including components for sending and receiving communications, including a communication manager 710, an I / O controller 715, a transceiver 720, an antenna 725, a memory 730, and a processor 740. These components may be in electronic communication via one or more buses (e.g., bus 745).

[0180] The communication manager 710 may identify (e.g., for a UE) corresponding TRP index values ​​corresponding to a first TRP and a second TRP, wherein the UE is configured to at least send a first transmission of an uplink signal to the first TRP using a first antenna panel and send a second transmission of an uplink signal to the second TRP using a second antenna panel different from the first antenna panel. The communication manager 710 may determine a default PLRS resource for one or more PLRS associated with the first transmission and the second transmission of the uplink signal, the default PLRS resource being based on whether the PLRS is configured, the corresponding TRP index value, and a determination of a resource selection rule. In some cases, the communication manager 710 may use the default PLRS resource to send one or more PLRS.

[0181] I / O controller 715 can manage input and output signals for device 705. I / O controller 715 can also manage peripheral devices that are not integrated into device 705. In some cases, I / O controller 715 can represent a physical connection or port to an external peripheral device. In some cases, I / O controller 715 can utilize an operating system, such as Or another known operating system. In other cases, I / O controller 715 can represent or interact with a modem, keyboard, mouse, touch screen, or similar device. In some cases, I / O controller 715 can be implemented as part of a processor. In some cases, a user can interact with device 705 via I / O controller 715 or via hardware components controlled by I / O controller 715.

[0182] The transceiver 720 can communicate bidirectionally via one or more antennas, wired or wireless links, as described above. For example, the transceiver 720 can represent a wireless transceiver and can communicate bidirectionally with another wireless transceiver. The transceiver 720 may also include a modem to modulate packets and provide the modulated packets to the antenna for transmission, and demodulate the packets received from the antenna. In some cases, the device 705 may include a single antenna 725. However, in some cases, the device may have more than one antenna 725, which may be able to send or receive multiple wireless transmissions simultaneously. In some examples, the device 705 may include one or more antenna panels or antenna arrays containing a set of antenna elements.

[0183] The memory 730 may include random access memory (RAM) and read-only memory (ROM). The memory 730 may store computer-readable, computer-executable code 735 including instructions that, when executed, cause the processor to perform the various functions described herein. In some cases, the memory 730 may contain, among other things, a basic input / output system (BIOS), which may control basic hardware or software operations, such as interaction with peripheral components or devices.

[0184] Processor 740 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, processor 740 may be configured to operate a memory array using a memory controller. In other cases, the memory controller may be integrated into processor 740. Processor 740 may be configured to execute computer-readable instructions stored in a memory (e.g., memory 730) to cause device 705 to perform various functions (e.g., a function or task of supporting a default path loss reference signal for multi-panel uplink transmission).

[0185] The code 735 may include instructions for implementing various aspects of the present disclosure, including instructions for supporting wireless communications. The code 735 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 735 may not be directly executable by the processor 740, but may cause a computer (e.g., when compiled and executed) to perform the functions described herein.

[0186] Figure 8 A flow chart illustrating a method 800 for supporting a default path loss reference signal for multi-panel uplink transmission according to aspects of the present disclosure is shown. The operations of the method 800 may be implemented by a UE 115 or a component thereof as described herein. For example, the operations of the method 800 may be performed by a communication manager, as described in reference to Figures 4 to 7 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 aspects of the functions described below.

[0187] At 805, the UE may identify respective TRP index values ​​corresponding to a first TRP and a second TRP, wherein the UE is configured to at least send a first transmission of an uplink signal to the first TRP using a first antenna panel and send a second transmission of an uplink signal to the second TRP using a second antenna panel different from the first antenna panel. The operations of 805 may be performed according to the methods described herein. In some examples, aspects of the operations of 805 may be performed by a configuration manager, such as with reference to Figures 4 to 7 described.

[0188] At 810, the UE may determine a default PLRS resource for one or more PLRSs associated with a first transmission and a second transmission of an uplink signal, the default PLRS resource being based on a determination of whether PLRS is configured, a corresponding TRP index value, and a resource selection rule. The operations of 810 may be performed according to the methods described herein. In some examples, aspects of the operations of 810 may be performed by a reference signal resource manager, such as a reference signal resource manager. Figures 4 to 7 described.

[0189] At 815, the UE may use the default PLRS resource to transmit one or more PLRS. The operations of 815 may be performed according to the methods described herein. In some examples, aspects of the operations of 815 may be performed by a scheduling manager, such as reference Figures 4 to 7 described.

[0190] Fig. 9A flow chart illustrating a method 900 for supporting a default path loss reference signal for multi-panel uplink transmission according to aspects of the present disclosure is shown. The operations of the method 900 may be implemented by a UE 115 or a component thereof as described herein. For example, the operations of the method 900 may be performed by a communication manager, as described in reference to Figures 4 to 7 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 aspects of the functions described below.

[0191] At 905, the UE may identify respective TRP index values ​​corresponding to a first TRP and a second TRP, wherein the UE is configured to at least send a first transmission of an uplink signal to the first TRP using a first antenna panel and send a second transmission of an uplink signal to the second TRP using a second antenna panel different from the first antenna panel. The operations of 905 may be performed according to the methods described herein. In some examples, aspects of the operations of 905 may be performed by a configuration manager, such as with reference to Figures 4 to 7 described.

[0192] At 910, the UE may determine a default PLRS resource for one or more PLRSs associated with a first transmission and a second transmission of an uplink signal, the default PLRS resource being based on a determination of whether PLRS is configured, a corresponding TRP index value, and a resource selection rule. The operations of 910 may be performed according to the methods described herein. In some examples, aspects of the operations of 910 may be performed by a reference signal resource manager, such as a reference signal resource manager. Figures 4 to 7 described.

[0193] At 915, the UE may determine that the PLRS is configured via RRC signaling. The operations of 915 may be performed according to the methods described herein. In some examples, aspects of the operations of 915 may be performed by a configuration manager, such as with reference to Figures 4 to 7 described.

[0194] At 920, the UE may determine that the DCI or additional RRC signaling associated with the corresponding TRP index value excludes configuration information for sending one or more default PLRS. The operations of 920 may be performed according to the methods described herein. In some examples, aspects of the operations of 920 may be performed by a configuration manager, such as reference Figures 4 to 7 described.

[0195] At 925, the UE may select a default PLRS resource based on the PLRS being configured and the configuration information being excluded according to the resource selection rule and the corresponding TRP index value. The operation of 925 may be performed according to the method described herein. In some examples, aspects of the operation of 925 may be performed by a reference signal resource manager, such as a reference signal resource manager. Figures 4 to 7 described.

[0196] At 930, the UE may use the default PLRS resources to transmit one or more PLRS. The operations of 930 may be performed according to the methods described herein. In some examples, aspects of the operations of 930 may be performed by a scheduling manager, such as reference Figures 4 to 7 described.

[0197] Fig.10 A flow chart illustrating a method 1000 for supporting a default path loss reference signal for multi-panel uplink transmission according to aspects of the present disclosure is shown. The operations of the method 1000 may be implemented by a UE 115 or a component thereof as described herein. For example, the operations of the method 1000 may be performed by a communication manager, as described in reference to Figures 4 to 7 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 aspects of the functions described below.

[0198] At 1005, the UE may identify respective TRP index values ​​corresponding to a first TRP and a second TRP, wherein the UE is configured to at least send a first transmission of an uplink signal to the first TRP using a first antenna panel and send a second transmission of an uplink signal to the second TRP using a second antenna panel different from the first antenna panel. The operations of 1005 may be performed according to the methods described herein. In some examples, aspects of the operations of 1005 may be performed by a configuration manager, such as with reference to Figures 4 to 7 described.

[0199] At 1010, the UE may determine a default PLRS resource for one or more PLRSs associated with a first transmission and a second transmission of an uplink signal, the default PLRS resource being based on a determination of whether PLRS is configured, a corresponding TRP index value, and a resource selection rule. The operations of 1010 may be performed according to the methods described herein. In some examples, aspects of the operations of 1010 may be performed by a reference signal resource manager, such as a reference signal resource manager. Figures 4 to 7 described.

[0200] At 1015, the UE may determine that the PLRS is not configured via RRC signaling. The operations of 1015 may be performed according to the methods described herein. In some examples, aspects of the operations of 1015 may be performed by a configuration manager, such as with reference to Figures 4 to 7 described.

[0201] At 1020, the UE may determine that the DCI excludes configuration information for sending one or more default PLRS. The operations of 1020 may be performed according to the methods described herein. In some examples, aspects of the operations of 1020 may be performed by a configuration manager, such as reference Figures 4 to 7 described.

[0202] At 1025, the UE may select a default PLRS resource according to a resource selection rule and a corresponding TRP index value based on the PLRS not being configured and the configuration information being excluded. The operation of 1025 may be performed according to the method described herein. In some examples, aspects of the operation of 1025 may be performed by a reference signal resource manager, such as a reference signal resource manager. Figures 4 to 7 described.

[0203] At 1030, the UE may use the default PLRS resources to transmit one or more PLRS. The operations of 1030 may be performed according to the methods described herein. In some examples, aspects of the operations of 1030 may be performed by a scheduling manager, such as in reference to Figures 4 to 7 described.

[0204] It should be noted that the methods described herein describe possible implementations, and that the operations and steps may be rearranged or otherwise modified, and that other implementations are possible. Furthermore, aspects from two or more methods may be combined.

[0205] 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 descriptions, the techniques described herein are applicable beyond LTE, LTE-A, LTE-A Pro, or NR networks. For example, the techniques described may be applied to various other wireless communication systems, such as Ultra Mobile Broadband (UMB), Institute of Electrical and Electronics Engineers (IEEE) 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802.20, Flash-OFDM, and other systems and radio technologies not explicitly mentioned herein.

[0206] 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 voltage, current, electromagnetic waves, magnetic fields or particles, optical fields or particles, or any combination thereof.

[0207] The various illustrative blocks and components described in conjunction with the present disclosure may be implemented or executed using a general purpose processor, a DSP, an ASIC, a CPU, 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 processor, controller, microcontroller, or state machine. The processor may also be implemented as a combination of computing devices (e.g., a combination of a DSP and a microprocessor, a plurality of microprocessors, one or more microprocessors combined with a DSP core, or any other such configuration).

[0208] The functions described herein may be implemented in hardware, software executed by a processor, firmware, or any combination thereof. If implemented in software executed by a processor, the functions may be stored on or sent via a computer-readable medium as one or more instructions or codes. Other examples and implementations are within the scope of this 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.

[0209] Computer-readable media include non-transitory computer storage media and communication media, including any media that helps 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 may include random access memory (RAM), read-only memory (ROM), electrically erasable programmable ROM (EEPROM), flash memory, compact disk (CD) ROM or other optical disk storage, disk storage or other magnetic storage device, or any other non-transitory medium, which can be used to carry or store the required program code components in the form of instructions or data structures, and can be accessed by a general or special computer or a general or special processor. Similarly, any connection can be appropriately referred to as a computer-readable medium. For example, if a coaxial cable, fiber optic cable, twisted pair, digital subscriber line (DSL) or wireless technology (such as infrared, radio and microwave) is used to send software from a website, server or other remote source, then coaxial cable, fiber optic cable, twisted pair, DSL or wireless technology (such as infrared, radio and microwave) are included in the definition of computer-readable media. Disk and disc as used herein include CD, laser disc, optical disc, digital versatile disc (DVD), floppy disk and Blu-ray disc, where disks usually reproduce data magnetically and discs reproduce data optically using lasers. Combinations of the above are also included within the scope of computer-readable media.

[0210] 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, so that, 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 example 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."

[0211] In the drawings, similar components or features may have the same reference number. In addition, various components of the same type may be distinguished by following the reference number with a dash and a second reference number to distinguish between similar components. If only the first reference number is used in the specification, the description applies to any similar components having the same first reference number, regardless of the second reference number or other subsequent reference numbers.

[0212] The description set forth 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 "example" as used herein means "used as an example, instance, or illustration," rather than "preferred" or "superior to other examples." For the purpose of providing an understanding of the described technology, the detailed description includes specific details. However, these technologies may be practiced without these specific details. In some instances, known structures and devices are shown in block diagram form to avoid making the concepts of the described examples unclear.

[0213] The description herein is provided to enable one of ordinary skill in the art to make or use the present disclosure. Various modifications of the present disclosure will be apparent to one of ordinary skill 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 widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A method for wireless communication at a user equipment UE, comprising: identifying respective transmit / receive point index values ​​corresponding to a first transmit / receive point and a second transmit / receive point, wherein the UE is configured to at least send a first transmission of an uplink signal to the first transmit / receive point using a first antenna panel and send a second transmission of the uplink signal to the second transmit / receive point using a second antenna panel different from the first antenna panel; determining a default path loss reference signal resource for one or more path loss reference signals associated with the first transmission and the second transmission of the uplink signal, the default path loss reference signal resource being based at least in part on a determination of whether a path loss reference signal is configured, the corresponding transmit / receive point index value, and a resource selection rule; and sending the one or more path loss reference signals using the default path loss reference signal resource, Wherein determining the default path loss reference signal resource further comprises: Determining that a control message associated with the corresponding transmission / reception point index value excludes configuration information for transmitting the one or more default path loss reference signals.

2. The method according to claim 1, wherein the control message is downlink control information or additional radio resource control signaling, and Wherein determining the default path loss reference signal resource further comprises: determining that the path loss reference signal is configured via radio resource control signaling; and Based at least in part on the path loss reference signal being configured and the configuration information being excluded, the default path loss reference signal resource is selected according to the resource selection rule and the corresponding transmission / reception point index value.

3. The method according to claim 2, wherein selecting the default path loss reference signal resource according to the resource selection rule comprises: identifying a path loss reference signal identifier value associated with the corresponding transmission / reception point index value; and The default path loss reference signal resource is selected based at least in part on the path loss reference signal identifier value, wherein the selected default path loss reference signal resource comprises a resource of a serving cell.

4. The method of claim 3, wherein each of the path loss reference signal identifier values ​​comprises a lowest path loss reference signal identifier value associated with the corresponding transmission / reception point index value.

5. The method according to claim 2, wherein selecting the default path loss reference signal resource according to the resource selection rule comprises: identifying a plurality of control resource sets for monitoring the downlink control information; identifying a control resource set from a plurality of control resource sets having a control resource set pool index value associated with the corresponding transmission / reception point index value; and The default path loss reference signal resource is selected based at least in part on the control resource set pool index value, wherein the default path loss reference signal resource comprises a periodic resource selected based at least in part on a spatial quasi co-location relationship associated with the identified control resource set.

6. The method of claim 5, wherein the control resource set having the control resource set pool index value associated with the corresponding transmission / reception point index value is located in an active downlink portion of a scheduling cell.

7. A method according to claim 5, wherein the control resource set having the control resource set pool index value associated with the corresponding transmit / receive point index value is in the active downlink portion of the primary cell, and wherein the configuration information excluded from the downlink control information includes spatial beam information about the active uplink bandwidth portion of the primary cell.

8. The method according to claim 2, further comprising: Determining that the configuration information excluded from the downlink control information includes a sounding reference signal resource indicator field associated with the corresponding transmission / reception point index value, wherein selecting the default path loss reference signal resource according to the resource selection rule comprises: identifying a mapping between power control identifier values ​​and path loss reference signal identifier values ​​associated with the corresponding transmission / reception point index values; and The default path loss reference signal resource is selected based at least in part on the path loss reference signal identifier value and in accordance with the mapping.

9. The method of claim 2, wherein the downlink control information is part of a multiple downlink control information scheme for scheduling the first transmission and the second transmission of the uplink signal.

10. The method according to claim 2, further comprising: Determining that the configuration information excluded from the additional radio resource control signaling includes an uplink configuration grant parameter, a format of the downlink control information activating the first transmission and the second transmission of the uplink signal, wherein selecting the default path loss reference signal resource according to the resource selection rule comprises: identifying a mapping between a sounding reference signal resource indicator field and a path loss reference signal identifier value associated with the corresponding transmission / reception point index value; and The default path loss reference signal resource is selected based at least in part on the path loss reference signal identifier value and in accordance with the mapping, wherein the selected default path loss reference signal resource comprises a resource of a serving cell.

11. The method of claim 10, wherein the downlink control information is part of a single downlink control information scheme for scheduling the first transmission and the second transmission of the uplink signal.

12. The method according to claim 2, further comprising: determining that the configuration information excluded from the additional radio resource control signaling includes one or more configuration authorization parameters, a format of the downlink control information activating the first transmission and the second transmission of the uplink signal, wherein selecting the default path loss reference signal resource according to the resource selection rule comprises: identifying a path loss reference signal identifier value associated with the corresponding transmission / reception point index value; and The default path loss reference signal resource is selected based at least in part on the path loss reference signal identifier value, wherein the selected default path loss reference signal resource comprises a resource of a serving cell.

13. The method of claim 12, wherein the downlink control information is part of a single downlink control information scheme for scheduling the first transmission and the second transmission of the uplink signal.

14. The method of claim 1, wherein the control message is downlink control information, and wherein the configuration information includes a sounding reference signal resource indicator field, and Wherein determining the default path loss reference signal resource further comprises: determining that the path loss reference signal is not configured via radio resource control signaling; and Based at least in part on the fact that the path loss reference signal is not configured and the configuration information is excluded, the default path loss reference signal resource is selected according to the resource selection rule and the corresponding transmission / reception point index value.

15. The method according to claim 14, wherein selecting the default path loss reference signal resource according to the resource selection rule comprises: identifying a plurality of sets of control resources for monitoring the downlink control information, wherein the downlink control information is part of a multiple downlink control information scheme for scheduling the first transmission and the second transmission of the uplink signal; identifying a control resource set from a plurality of control resource sets having a control resource set pool index value associated with the corresponding transmission / reception point index value, wherein the identified control resource set is within an active downlink bandwidth portion; and The default path loss reference signal resource is selected based at least in part on the control resource set pool index value, wherein the default path loss reference signal resource comprises a periodic resource selected based at least in part on a spatial quasi co-location relationship associated with the identified control resource set.

16. The method according to claim 14, wherein selecting the default path loss reference signal resource according to the resource selection rule comprises: identifying a set of transmission configuration indicator states for a physical downlink shared channel, wherein the downlink control information is part of a multiple downlink control information scheme for scheduling the first transmission and the second transmission of the uplink signal; identifying, from the set of transmission configuration indicator states, a transmission configuration identifier associated with the corresponding transmission / reception point index value; and The default path loss reference signal resource is selected based at least in part on the transmission configuration identifier, wherein a control resource set associated with the corresponding transmission / reception point index value is located in a downlink bandwidth portion different from an active downlink bandwidth portion.

17. The method according to claim 14, wherein selecting the default path loss reference signal resource according to the resource selection rule comprises: identifying a set of transmission configuration indicator states for a physical downlink shared channel, wherein the downlink control information is part of a single downlink control information scheme for scheduling the first transmission and the second transmission of the uplink signal; identifying, from the set of transmission configuration indicator states, a transmission configuration identifier associated with the corresponding transmission / reception point index value, wherein each of the transmission configuration identifiers is within a transmission configuration indicator code point for a pair of transmission configuration indicator states; and The default path loss reference signal resource is selected based at least in part on the transmission configuration identifier, wherein a control resource set associated with the corresponding transmission / reception point index value is located in a downlink bandwidth portion different from an active downlink bandwidth portion.

18. The method of claim 17, wherein the transmission configuration identifier may have a lowest value of the transmission configuration indicator code points of the pair of transmission configuration indicator states.

19. The method according to claim 14, wherein selecting the default path loss reference signal resource according to the resource selection rule comprises: identifying a plurality of sets of control resources for monitoring the downlink control information, wherein the downlink control information is part of a single downlink control information scheme for scheduling the first transmission and the second transmission of the uplink signal; identifying a control resource set from a plurality of control resource sets having a control resource set pool index value associated with the corresponding transmission / reception point index value, wherein the identified control resource set is within an active downlink bandwidth portion; and The default path loss reference signal resource is selected based at least in part on the control resource set pool index value, wherein the default path loss reference signal resource comprises a periodic resource selected based at least in part on a spatial quasi co-location relationship associated with the identified control resource set.

20. The method of claim 1, wherein the control message is additional radio resource control signaling associated with the corresponding transmission / reception point index value, and wherein the configuration information includes spatial relationship information, and Wherein determining the default path loss reference signal resource further comprises: determining that the path loss reference signal is configured via radio resource control signaling; and At least in part based on the path loss reference signal being configured and the configuration information being excluded, selecting the default path loss reference signal resource according to the resource selection rule and the corresponding transmission / reception point index value, wherein selecting the default path loss reference signal resource according to the resource selection rule comprises: identifying a path loss reference signal identifier value associated with the corresponding transmission / reception point index value; and The default path loss reference signal resource is selected based at least in part on the path loss reference signal identifier value, wherein the selected default path loss reference signal resource comprises a resource of a serving cell.

21. The method of claim 1, wherein the control message is additional radio resource control signaling associated with the corresponding transmission / reception point index value, and wherein the configuration information includes spatial relationship information, and Wherein determining the default path loss reference signal resource further comprises: determining that the path loss reference signal is not configured via radio resource control signaling; and At least in part based on the path loss reference signal not being configured and the configuration information being excluded, selecting the default path loss reference signal resource according to the resource selection rule and the corresponding transmission / reception point index value, wherein selecting the default path loss reference signal resource according to the resource selection rule comprises: identifying a plurality of control resource sets for monitoring downlink control information; identifying a control resource set from a plurality of control resource sets having a control resource set pool index value associated with the corresponding transmission / reception point index value; and The default path loss reference signal resource is selected based at least in part on the control resource set pool index value, wherein the default path loss reference signal resource comprises a periodic resource selected based at least in part on a spatial quasi co-location relationship associated with the identified control resource set.

22. The method according to claim 1, wherein the control message is an additional radio resource control signaling associated with the corresponding transmission / reception point index value, and wherein the configuration information is for a sounding reference signal associated with the corresponding transmission / reception point index value, and Wherein determining the default path loss reference signal resource further comprises: determining that the path loss reference signal is not configured via radio resource control signaling; and selecting the default path loss reference signal resource according to the resource selection rule and the corresponding transmission / reception point index value based at least in part on the fact that the path loss reference signal is not configured and the configuration information is excluded, wherein selecting the default path loss reference signal resource according to the resource selection rule comprises: identifying a synchronization signal block used to receive a master information block associated with the corresponding transmission / reception point index value; and The default path loss reference signal resource is selected based at least in part on the identified synchronization signal block.

23. The method of claim 1, wherein determining the default path loss reference signal resource further comprises: determining that one or more higher layer parameters are not received at the UE; At least in part based on one or more higher layer parameters not being received, selecting the default path loss reference signal resource according to the resource selection rule and the corresponding transmission / reception point index value, wherein selecting the default path loss reference signal resource according to the resource selection rule comprises: identifying a synchronization signal block used to receive a master information block associated with the corresponding transmission / reception point index value; and The default path loss reference signal resource is selected based at least in part on the identified synchronization signal block.

24. The method according to claim 1, wherein the control message is an additional radio resource control signaling associated with the corresponding transmission / reception point index value, and wherein the configuration information is for a sounding reference signal associated with the corresponding transmission / reception point index value, and Wherein determining the default path loss reference signal resource further comprises: determining that the path loss reference signal is not configured via radio resource control signaling; and Based at least in part on the fact that the path loss reference signal is not configured and the configuration information is excluded, the default path loss reference signal resource is selected according to the resource selection rule and the corresponding transmission / reception point index value.

25. The method according to claim 24, wherein selecting the default path loss reference signal resource according to the resource selection rule comprises: identifying a plurality of control resource sets for monitoring downlink control information; identifying a control resource set from a plurality of control resource sets having a lowest control resource set pool index value associated with the corresponding transmission / reception point index value, wherein the identified control resource set is within an active downlink bandwidth portion; and The default path loss reference signal resource is selected based at least in part on the lowest control resource set pool index value, wherein the default path loss reference signal resource comprises a periodic resource selected based at least in part on a spatial quasi co-located relationship associated with the identified control resource set.

26. The method according to claim 24, wherein selecting the default path loss reference signal resource according to the resource selection rule comprises: identifying a set of transmission configuration indicator states for a physical downlink shared channel; identifying, from the set of transmission configuration indicator states, a transmission configuration identifier associated with the corresponding transmission / reception point index value; and The default path loss reference signal resource is selected based at least in part on the transmission configuration identifier, wherein a control resource set associated with the corresponding transmission / reception point index value is located in a downlink bandwidth portion different from an active downlink bandwidth portion.

27. The method of claim 1, wherein determining the default path loss reference signal resource further comprises: determining that the path loss reference signal is not configured for the first transmission and the second transmission of the uplink signal, wherein the first transmission and the second transmission of the uplink are based at least in part on downlink control information received according to a single downlink control information scheme; and Based at least in part on the path loss reference signal not being configured, the default path loss reference signal resource is selected according to the resource selection rule and the corresponding transmission / reception point index value.

28. The method according to claim 27, wherein selecting the default path loss reference signal resource according to the resource selection rule comprises: for said first transmission of said uplink signal, determining a first set of periodic reference signal resources based at least in part on a first transmission configuration indicator identifier value from a first pair of transmission configuration indicators; for the second transmission of the uplink signal, determining a second set of periodic reference signal resources based at least in part on a second transmission configuration indicator identifier value from a second pair of transmission configuration indicators; and The default path loss reference signal resource is selected based at least in part on the first set of periodic reference signal resources and the second set of periodic reference signal resources.

29. The method of claim 28, wherein the first transmission configuration indicator identifier value is a lowest transmission configuration indicator identifier value of the first pair of transmission configuration indicators, and wherein the second transmission configuration indicator identifier value is a lowest transmission configuration indicator identifier value of the second pair of transmission configuration indicators.

30. The method of claim 27, wherein selecting the default path loss reference signal resource according to the resource selection rule comprises: for the first transmission and the second transmission of the uplink signal, determining a set of periodic reference signal resources based at least in part on a pair of transmission configuration indicators from a plurality of pairs of transmission configuration indicators; and The default path loss reference signal resource is selected based at least in part on the set of periodic reference signal resources.

31. The method of claim 30, wherein the pair of transmission configuration indicators has a lowest sum of transmission configuration indicator identifier values, or has a highest sum of transmission configuration indicator identifier values, or corresponds to a first transmission configuration indicator code point having a multiple transmission configuration indicator state.

32. The method of claim 27, wherein selecting the default path loss reference signal resource according to the resource selection rule comprises: for the first transmission and the second transmission of the uplink signal, determining a first reference signal resource set based at least in part on single panel transmission and a second reference signal resource set based on a predefined mapping between the first reference signal resource set and the second reference signal resource set; and The default path loss reference signal resource is selected based at least in part on the first set of reference signal resources or the second set of reference signal resources, or any combination thereof.

33. The method of claim 32, wherein the predefined mapping is based at least in part on one or more pairs of transmission configuration indicator states.

34. The method of claim 27, wherein the uplink signal comprises data on a physical uplink shared channel, or control information on a physical uplink control channel, or a sounding reference signal.

35. An apparatus for wireless communication at a user equipment UE, comprising: processor, a memory coupled to the processor; as well as instructions stored in the memory and executable by the processor to cause the device to: identifying respective transmit / receive point index values ​​corresponding to a first transmit / receive point and a second transmit / receive point, wherein the UE is configured to at least send a first transmission of an uplink signal to the first transmit / receive point using a first antenna panel and send a second transmission of the uplink signal to the second transmit / receive point using a second antenna panel different from the first antenna panel; determining a default path loss reference signal resource for one or more path loss reference signals associated with the first transmission and the second transmission of the uplink signal, the default path loss reference signal resource being based at least in part on a determination of whether a path loss reference signal is configured, the corresponding transmit / receive point index value, and a resource selection rule; and sending the one or more path loss reference signals using the default path loss reference signal resource, Wherein determining the default path loss reference signal resource further comprises: Determining that a control message associated with the corresponding transmission / reception point index value excludes configuration information for transmitting the one or more default path loss reference signals.

36. The apparatus of claim 35, wherein the control message is downlink control information or additional radio resource control signaling, and The instructions for determining the default path loss reference signal resource may also be executed by the processor to cause the apparatus to: determining that the path loss reference signal is configured via radio resource control signaling; and Based at least in part on the path loss reference signal being configured and the configuration information being excluded, the default path loss reference signal resource is selected according to the resource selection rule and the corresponding transmission / reception point index value.

37. The apparatus of claim 36, wherein the instructions for selecting the default path loss reference signal resource according to the resource selection rule are executable by the processor to cause the apparatus to: identifying a path loss reference signal identifier value associated with the corresponding transmission / reception point index value; and The default path loss reference signal resource is selected based at least in part on the path loss reference signal identifier value, wherein the selected default path loss reference signal resource comprises a resource of a serving cell.

38. The apparatus of claim 37, wherein each of the path loss reference signal identifier values ​​comprises a lowest path loss reference signal identifier value associated with the corresponding transmission / reception point index value.

39. The apparatus of claim 36, wherein the instructions for selecting the default path loss reference signal resource according to the resource selection rule are executable by the processor to cause the apparatus to: identifying a plurality of control resource sets for monitoring the downlink control information; identifying a control resource set from a plurality of control resource sets having a control resource set pool index value associated with the corresponding transmission / reception point index value; and The default path loss reference signal resource is selected based at least in part on the control resource set pool index value, wherein the default path loss reference signal resource comprises a periodic resource selected based at least in part on a spatial quasi co-location relationship associated with the identified control resource set.

40. The apparatus of claim 39, wherein the control resource set having the control resource set pool index value associated with the corresponding transmission / reception point index value is located in an active downlink portion of a scheduling cell.

41. An apparatus according to claim 39, wherein the control resource set having the control resource set pool index value associated with the corresponding transmit / receive point index value is in the active downlink portion of a primary cell, and wherein the configuration information excluded from the downlink control information includes spatial beam information about the active uplink bandwidth portion of the primary cell.

42. The apparatus of claim 36, wherein the instructions are further executable by the processor to cause the apparatus to: determining the configuration information to be excluded from the downlink control information is executable by the processor to cause the apparatus to detect a reference signal resource indicator field associated with the corresponding transmission / reception point index value, wherein the instructions to select the default path loss reference signal resource according to the resource selection rule are executable by the processor to cause the apparatus to: identifying a mapping between power control identifier values ​​and path loss reference signal identifier values ​​associated with the corresponding transmission / reception point index values; and The default path loss reference signal resource is selected based at least in part on the path loss reference signal identifier value and in accordance with the mapping.

43. The apparatus of claim 36, wherein the downlink control information is part of a multiple downlink control information scheme for scheduling the first transmission and the second transmission of the uplink signal.

44. The apparatus of claim 36, wherein the instructions are further executable by the processor to cause the apparatus to: determining that the configuration information excluded from the additional radio resource control signaling includes an uplink configuration grant parameter, a format of the downlink control information activating the first transmission and the second transmission of the uplink signal, wherein the instructions for selecting the default path loss reference signal resource according to the resource selection rule are executable by the processor to cause the apparatus to: identifying a mapping between a sounding reference signal resource indicator field and a path loss reference signal identifier value associated with the corresponding transmission / reception point index value; and The default path loss reference signal resource is selected based at least in part on the path loss reference signal identifier value and in accordance with the mapping, wherein the selected default path loss reference signal resource comprises a resource of a serving cell.

45. The apparatus of claim 44, wherein the downlink control information is part of a single downlink control information scheme for scheduling the first and second transmissions of the uplink signal.

46. ​​The apparatus of claim 36, wherein the instructions are further executable by the processor to cause the apparatus to: determining that the configuration information excluded from the additional radio resource control signaling includes one or more configuration authorization parameters, a format of the downlink control information activating the first transmission and the second transmission of the uplink signal, wherein the instructions for selecting the default path loss reference signal resource according to the resource selection rule are executable by the processor to cause the apparatus to: identifying a path loss reference signal identifier value associated with the corresponding transmission / reception point index value; and The default path loss reference signal resource is selected based at least in part on the path loss reference signal identifier value, wherein the selected default path loss reference signal resource comprises a resource of a serving cell.

47. The apparatus of claim 46, wherein the downlink control information is part of a single downlink control information scheme for scheduling the first and second transmissions of the uplink signal.

48. The apparatus of claim 35, wherein the control message is downlink control information, and wherein the configuration information includes a sounding reference signal resource indicator field, and The instructions for determining the default path loss reference signal resource may also be executed by the processor to cause the apparatus to: determining that the path loss reference signal is not configured via radio resource control signaling; and Based at least in part on the fact that the path loss reference signal is not configured and the configuration information is excluded, the default path loss reference signal resource is selected according to the resource selection rule and the corresponding transmission / reception point index value.

49. The apparatus of claim 48, wherein the instructions for selecting the default path loss reference signal resource according to the resource selection rule are executable by the processor to cause the apparatus to: identifying a plurality of sets of control resources for monitoring the downlink control information, wherein the downlink control information is part of a multiple downlink control information scheme for scheduling the first transmission and the second transmission of the uplink signal; identifying a control resource set from a plurality of control resource sets having a control resource set pool index value associated with the corresponding transmission / reception point index value, wherein the identified control resource set is within an active downlink bandwidth portion; and The default path loss reference signal resource is selected based at least in part on the control resource set pool index value, wherein the default path loss reference signal resource comprises a periodic resource selected based at least in part on a spatial quasi co-location relationship associated with the identified control resource set.

50. The apparatus of claim 48, wherein the instructions to select the default path loss reference signal resource according to the resource selection rule are executable by the processor to cause the apparatus to: identifying a set of transmission configuration indicator states for a physical downlink shared channel, wherein the downlink control information is part of a multiple downlink control information scheme for scheduling the first transmission and the second transmission of the uplink signal; identifying, from the set of transmission configuration indicator states, a transmission configuration identifier associated with the corresponding transmission / reception point index value; and The default path loss reference signal resource is selected based at least in part on the transmission configuration identifier, wherein a control resource set associated with the corresponding transmission / reception point index value is located in a downlink bandwidth portion different from an active downlink bandwidth portion.

51. The apparatus of claim 48, wherein the instructions for selecting the default path loss reference signal resource according to the resource selection rule are executable by the processor to cause the apparatus to: identifying a set of transmission configuration indicator states for a physical downlink shared channel, wherein the downlink control information is part of a single downlink control information scheme for scheduling the first transmission and the second transmission of the uplink signal; identifying, from the set of transmission configuration indicator states, a transmission configuration identifier associated with the corresponding transmission / reception point index value, wherein each of the transmission configuration identifiers is within a transmission configuration indicator code point for a pair of transmission configuration indicator states; and The default path loss reference signal resource is selected based at least in part on the transmission configuration identifier, wherein a control resource set associated with the corresponding transmission / reception point index value is located in a downlink bandwidth portion different from an active downlink bandwidth portion.

52. The apparatus of claim 51, wherein the transmission configuration identifier may have a lowest value of the transmission configuration indicator code points of the pair of transmission configuration indicator states.

53. The apparatus of claim 48, wherein the instructions for selecting the default path loss reference signal resource according to the resource selection rule are executable by the processor to cause the apparatus to: identifying a plurality of sets of control resources for monitoring the downlink control information, wherein the downlink control information is part of a single downlink control information scheme for scheduling the first transmission and the second transmission of the uplink signal; identifying a control resource set from a plurality of control resource sets having a control resource set pool index value associated with the corresponding transmission / reception point index value, wherein the identified control resource set is within an active downlink bandwidth portion; and The default path loss reference signal resource is selected based at least in part on the control resource set pool index value, wherein the default path loss reference signal resource comprises a periodic resource selected based at least in part on a spatial quasi co-location relationship associated with the identified control resource set.

54. The apparatus of claim 35, wherein the control message is additional radio resource control signaling associated with the corresponding transmission / reception point index value, and wherein the configuration information includes spatial relationship information, and The instructions for determining the default path loss reference signal resource may also be executed by the processor to cause the apparatus to: determining that the path loss reference signal is configured via radio resource control signaling; and selecting the default path loss reference signal resource according to the resource selection rule and the corresponding transmission / reception point index value based at least in part on the path loss reference signal being configured and the configuration information being excluded, wherein the instructions for selecting the default path loss reference signal resource according to the resource selection rule are executable by the processor to cause the apparatus to: identifying a path loss reference signal identifier value associated with the corresponding transmission / reception point index value; and The default path loss reference signal resource is selected based at least in part on the path loss reference signal identifier value, wherein the selected default path loss reference signal resource comprises a resource of a serving cell.

55. The apparatus of claim 35, wherein the control message is additional radio resource control signaling associated with the corresponding transmission / reception point index value, and wherein the configuration information includes spatial relationship information, and The instructions for determining the default path loss reference signal resource may also be executed by the processor to cause the apparatus to: determining that the path loss reference signal is not configured via radio resource control signaling; and selecting the default path loss reference signal resource according to the resource selection rule and the corresponding transmission / reception point index value based at least in part on the path loss reference signal not being configured and the configuration information being excluded, wherein the instructions for selecting the default path loss reference signal resource according to the resource selection rule are executable by the processor to cause the apparatus to: identifying a plurality of control resource sets for monitoring downlink control information; identifying a control resource set from a plurality of control resource sets having a control resource set pool index value associated with the corresponding transmission / reception point index value; and The default path loss reference signal resource is selected based at least in part on the control resource set pool index value, wherein the default path loss reference signal resource comprises a periodic resource selected based at least in part on a spatial quasi co-location relationship associated with the identified control resource set.

56. The apparatus of claim 35, wherein the control message is additional radio resource control signaling associated with the corresponding transmission / reception point index value, and wherein the configuration information is for a sounding reference signal associated with the corresponding transmission / reception point index value, and The instructions for determining the default path loss reference signal resource may also be executed by the processor to cause the apparatus to: determining that the path loss reference signal is not configured via radio resource control signaling; and selecting the default path loss reference signal resource according to the resource selection rule and the corresponding transmission / reception point index value based at least in part on the path loss reference signal not being configured and the configuration information being excluded, wherein the instructions for selecting the default path loss reference signal resource according to the resource selection rule are executable by the processor to cause the apparatus to: identifying a synchronization signal block used to receive a master information block associated with the corresponding transmission / reception point index value; and The default path loss reference signal resource is selected based at least in part on the identified synchronization signal block.

57. The apparatus of claim 35, wherein the instructions for determining the default path loss reference signal resource are further executable by the processor to cause the apparatus to: determining that one or more higher layer parameters are not received at the UE; and selecting the default path loss reference signal resource according to the resource selection rule and the corresponding transmission / reception point index value based at least in part on the one or more higher layer parameters not being received, wherein the instructions for selecting the default path loss reference signal resource according to the resource selection rule are executable by the processor to cause the apparatus to: identifying a synchronization signal block used to receive a master information block associated with the corresponding transmission / reception point index value; and The default path loss reference signal resource is selected based at least in part on the identified synchronization signal block.

58. The apparatus of claim 35, wherein the control message is additional radio resource control signaling associated with the corresponding transmission / reception point index value, and wherein the configuration information is for a sounding reference signal associated with the corresponding transmission / reception point index value, and The instructions for determining the default path loss reference signal resource may also be executed by the processor to cause the apparatus to: determining that the path loss reference signal is not configured via radio resource control signaling; and Based at least in part on the fact that the path loss reference signal is not configured and the configuration information is excluded, the default path loss reference signal resource is selected according to the resource selection rule and the corresponding transmission / reception point index value.

59. The apparatus of claim 58, wherein the instructions for selecting the default path loss reference signal resource according to the resource selection rule are executable by the processor to cause the apparatus to: identifying a plurality of control resource sets for monitoring downlink control information; identifying a control resource set from a plurality of control resource sets having a lowest control resource set pool index value associated with the corresponding transmission / reception point index value, wherein the identified control resource set is within an active downlink bandwidth portion; and The default path loss reference signal resource is selected based at least in part on the lowest control resource set pool index value, wherein the default path loss reference signal resource comprises a periodic resource selected based at least in part on a spatial quasi co-located relationship associated with the identified control resource set.

60. The apparatus of claim 58, wherein the instructions to select the default path loss reference signal resource according to the resource selection rule are executable by the processor to cause the apparatus to: identifying a set of transmission configuration indicator states for a physical downlink shared channel; identifying, from the set of transmission configuration indicator states, a transmission configuration identifier associated with the corresponding transmission / reception point index value; and The default path loss reference signal resource is selected based at least in part on the transmission configuration identifier, wherein a control resource set associated with the corresponding transmission / reception point index value is located in a downlink bandwidth portion different from an active downlink bandwidth portion.

61. The apparatus of claim 35, wherein the instructions for determining the default path loss reference signal resource are further executable by the processor to cause the apparatus to: determining that the path loss reference signal is not configured for the first transmission and the second transmission of the uplink signal, wherein the first transmission and the second transmission of the uplink are based at least in part on downlink control information received according to a single downlink control information scheme; and Based at least in part on the path loss reference signal not being configured, the default path loss reference signal resource is selected according to the resource selection rule and the corresponding transmission / reception point index value.

62. The apparatus of claim 61 , wherein the instructions for selecting the default path loss reference signal resource according to the resource selection rule are executable by the processor to cause the apparatus to: for said first transmission of said uplink signal, determining a first set of periodic reference signal resources based at least in part on a first transmission configuration indicator identifier value from a first pair of transmission configuration indicators; for the second transmission of the uplink signal, determining a second set of periodic reference signal resources based at least in part on a second transmission configuration indicator identifier value from a second pair of transmission configuration indicators; and The default path loss reference signal resource is selected based at least in part on the first set of periodic reference signal resources and the second set of periodic reference signal resources.

63. The apparatus of claim 62, wherein the first transmission configuration indicator identifier value is a lowest transmission configuration indicator identifier value of the first pair of transmission configuration indicators, and wherein the second transmission configuration indicator identifier value is a lowest transmission configuration indicator identifier value of the second pair of transmission configuration indicators.

64. The apparatus of claim 61, wherein the instructions for selecting the default path loss reference signal resource according to the resource selection rule are executable by the processor to cause the apparatus to: for the first transmission and the second transmission of the uplink signal, determining a set of periodic reference signal resources based at least in part on a pair of transmission configuration indicators from a plurality of pairs of transmission configuration indicators; and The default path loss reference signal resource is selected based at least in part on the set of periodic reference signal resources.

65. The apparatus of claim 64, wherein the pair of transmission configuration indicators has a lowest sum of transmission configuration indicator identifier values, or has a highest sum of transmission configuration indicator identifier values, or corresponds to a first transmission configuration indicator code point having a multiple transmission configuration indicator state.

66. The apparatus of claim 61, wherein the instructions to select the default path loss reference signal resource according to the resource selection rule are executable by the processor to cause the apparatus to: for the first transmission and the second transmission of the uplink signal, determining a first reference signal resource set based at least in part on a single panel transmission and a second reference signal resource set based on a predefined mapping between the first reference signal resource set and the second reference signal resource set; and The default path loss reference signal resource is selected based at least in part on the first set of reference signal resources or the second set of reference signal resources, or any combination thereof.

67. The apparatus of claim 66, wherein the predefined mapping is based at least in part on one or more pairs of transmission configuration indicator states.

68. The apparatus of claim 61, wherein the uplink signal comprises data on a physical uplink shared channel, or control information on a physical uplink control channel, or a sounding reference signal.

69. An apparatus for wireless communication at a user equipment UE, comprising: means for identifying respective transmit / receive point index values ​​corresponding to a first transmit / receive point and a second transmit / receive point, wherein the UE is configured to at least transmit a first transmission of an uplink signal to the first transmit / receive point using a first antenna panel and transmit a second transmission of the uplink signal to the second transmit / receive point using a second antenna panel different from the first antenna panel; means for determining a default path loss reference signal resource for one or more path loss reference signals associated with the first transmission and the second transmission of the uplink signal, the default path loss reference signal resource being based at least in part on a determination of whether a path loss reference signal is configured, the corresponding transmission / reception point index value, and a resource selection rule; as well as means for transmitting the one or more path loss reference signals using the default path loss reference signal resource, The component for determining the default path loss reference signal resource further includes: The means for determining that the control message associated with the corresponding transmission / reception point index value excludes configuration information for transmitting the one or more default path loss reference signals.

70. The apparatus of claim 69, wherein the control message is downlink control information or additional radio resource control signaling, and The component for determining the default path loss reference signal resource further includes: means for determining that the path loss reference signal is configured via radio resource control signaling; as well as means for selecting the default path loss reference signal resource according to the resource selection rule and the corresponding transmission / reception point index value based at least in part on the path loss reference signal being configured and the configuration information being excluded.

71. The apparatus of claim 70, wherein the means for selecting the default path loss reference signal resource according to the resource selection rule comprises: means for identifying a path loss reference signal identifier value associated with said corresponding transmission / reception point index value; as well as Means for selecting the default path loss reference signal resource based at least in part on the path loss reference signal identifier value, wherein the selected default path loss reference signal resource comprises a resource of a serving cell.

72. The apparatus of claim 71, wherein each of the path loss reference signal identifier values ​​comprises a lowest path loss reference signal identifier value associated with the corresponding transmission / reception point index value.

73. The apparatus of claim 70, wherein the means for selecting the default path loss reference signal resource according to the resource selection rule comprises: means for identifying a plurality of control resource sets for monitoring said downlink control information; means for identifying a control resource set from a plurality of control resource sets having a control resource set pool index value associated with the corresponding transmission / reception point index value; as well as means for selecting the default path loss reference signal resource based at least in part on the control resource set pool index value, wherein the default path loss reference signal resource comprises a periodic resource selected based at least in part on a spatial quasi co-located relationship associated with the identified set of control resources.

74. The apparatus of claim 73, wherein the control resource set having the control resource set pool index value associated with the corresponding transmit / receive point index value is located in an active downlink portion of a scheduling cell.

75. An apparatus according to claim 73, wherein the control resource set having the control resource set pool index value associated with the corresponding transmit / receive point index value is in the active downlink portion of a primary cell, and wherein the configuration information excluded from the downlink control information includes spatial beam information about the active uplink bandwidth portion of the primary cell.

76. The apparatus of claim 70, further comprising: The means for determining that the configuration information excluded from the downlink control information includes a sounding reference signal resource indicator field associated with the corresponding transmission / reception point index value, wherein the means for selecting the default path loss reference signal resource according to the resource selection rule comprises: means for identifying a mapping between a power control identifier value and a path loss reference signal identifier value associated with said corresponding transmission / reception point index value; and Means for selecting the default path loss reference signal resource based at least in part on the path loss reference signal identifier value and in accordance with the mapping.

77. The apparatus of claim 70, wherein the downlink control information is part of a multiple downlink control information scheme for scheduling the first and second transmissions of the uplink signal.

78. The apparatus of claim 70, further comprising: means for determining that the configuration information excluded from the additional radio resource control signaling includes an uplink configuration grant parameter, a format of the downlink control information activating the first transmission and the second transmission of the uplink signal, wherein the means for selecting the default path loss reference signal resource according to the resource selection rule comprises: means for identifying a mapping between a sounding reference signal resource indicator field and a path loss reference signal identifier value associated with the corresponding transmission / reception point index value; and means for selecting the default path loss reference signal resource based at least in part on the path loss reference signal identifier value and in accordance with the mapping, wherein the selected default path loss reference signal resource comprises a resource of a serving cell.

79. The apparatus of claim 78, wherein the downlink control information is part of a single downlink control information scheme for scheduling the first and second transmissions of the uplink signal.

80. The apparatus of claim 70, further comprising: means for determining that the configuration information excluded from the additional radio resource control signaling includes one or more configuration authorization parameters, a format of the downlink control information activating the first transmission and the second transmission of the uplink signal, wherein the means for selecting the default path loss reference signal resource according to the resource selection rule comprises: means for identifying a path loss reference signal identifier value associated with said corresponding transmission / reception point index value; and Means for selecting the default path loss reference signal resource based at least in part on the path loss reference signal identifier value, wherein the selected default path loss reference signal resource comprises a resource of a serving cell.

81. The apparatus of claim 80, wherein the downlink control information is part of a single downlink control information scheme for scheduling the first and second transmissions of the uplink signal.

82. The apparatus of claim 69, wherein the control message is downlink control information, and wherein the configuration information includes a sounding reference signal resource indicator field, and The component for determining the default path loss reference signal resource further includes: means for determining that the path loss reference signal is not configured via radio resource control signaling; as well as means for selecting the default path loss reference signal resource according to the resource selection rule and the corresponding transmission / reception point index value based at least in part on the path loss reference signal not being configured and the configuration information being excluded.

83. The apparatus of claim 82, wherein the means for selecting the default path loss reference signal resource according to the resource selection rule comprises: means for identifying a plurality of sets of control resources for monitoring the downlink control information, wherein the downlink control information is part of a multiple downlink control information scheme for scheduling the first transmission and the second transmission of the uplink signal; means for identifying a control resource set from a plurality of control resource sets having a control resource set pool index value associated with the corresponding transmission / reception point index value, wherein the identified control resource set is within an active downlink bandwidth portion; and means for selecting the default path loss reference signal resource based at least in part on the control resource set pool index value, wherein the default path loss reference signal resource comprises a periodic resource selected based at least in part on a spatial quasi co-located relationship associated with the identified set of control resources.

84. The apparatus of claim 82, wherein the means for selecting the default path loss reference signal resource according to the resource selection rule comprises: means for identifying a set of transmission configuration indicator states for a physical downlink shared channel, wherein the downlink control information is part of a multiple downlink control information scheme for scheduling the first transmission and the second transmission of the uplink signal; means for identifying, from said set of transmission configuration indicator states, a transmission configuration identifier associated with said corresponding transmission / reception point index value; as well as Means for selecting the default path loss reference signal resource based at least in part on the transmission configuration identifier, wherein a set of control resources associated with the corresponding transmission / reception point index value is located in a downlink bandwidth portion different from an active downlink bandwidth portion.

85. The apparatus of claim 82, wherein the means for selecting the default path loss reference signal resource according to the resource selection rule comprises: means for identifying a set of transmission configuration indicator states for a physical downlink shared channel, wherein the downlink control information is part of a single downlink control information scheme for scheduling the first transmission and the second transmission of the uplink signal; means for identifying, from said set of transmission configuration indicator states, a transmission configuration identifier associated with said corresponding transmission / reception point index value, wherein each of said transmission configuration identifiers is within a transmission configuration indicator code point for a pair of transmission configuration indicator states; and Means for selecting the default path loss reference signal resource based at least in part on the transmission configuration identifier, wherein a set of control resources associated with the corresponding transmission / reception point index value is located in a downlink bandwidth portion different from an active downlink bandwidth portion.

86. The apparatus of claim 85, wherein the transmission configuration identifier may have a lowest value of the transmission configuration indicator code points of the pair of transmission configuration indicator states.

87. The apparatus of claim 82, wherein the means for selecting the default path loss reference signal resource according to the resource selection rule comprises: means for identifying a plurality of sets of control resources for monitoring the downlink control information, wherein the downlink control information is part of a single downlink control information scheme for scheduling the first transmission and the second transmission of the uplink signal; means for identifying a control resource set from a plurality of control resource sets having a control resource set pool index value associated with the corresponding transmission / reception point index value, wherein the identified control resource set is within an active downlink bandwidth portion; and means for selecting the default path loss reference signal resource based at least in part on the control resource set pool index value, wherein the default path loss reference signal resource comprises a periodic resource selected based at least in part on a spatial quasi co-located relationship associated with the identified set of control resources.

88. The apparatus of claim 69, wherein the control message is additional radio resource control signaling associated with the corresponding transmission / reception point index value, and wherein the configuration information includes spatial relationship information, and The component for determining the default path loss reference signal resource further includes: means for determining that the path loss reference signal is configured via radio resource control signaling; as well as Based at least in part on the path loss reference signal being configured and the configuration information being excluded, a component for selecting the default path loss reference signal resource according to the resource selection rule and the corresponding transmission / reception point index value, wherein the component for selecting the default path loss reference signal resource according to the resource selection rule comprises: means for identifying a path loss reference signal identifier value associated with said corresponding transmission / reception point index value; as well as Means for selecting the default path loss reference signal resource based at least in part on the path loss reference signal identifier value, wherein the selected default path loss reference signal resource comprises a resource of a serving cell.

89. The apparatus of claim 69, wherein the control message is additional radio resource control signaling associated with the corresponding transmission / reception point index value, and wherein the configuration information includes spatial relationship information, and The component for determining the default path loss reference signal resource further includes: means for determining that the path loss reference signal is not configured via radio resource control signaling; as well as Based at least in part on the fact that the path loss reference signal is not configured and the configuration information is excluded, a component for selecting the default path loss reference signal resource according to the resource selection rule and the corresponding transmission / reception point index value, wherein the component for selecting the default path loss reference signal resource according to the resource selection rule comprises: means for identifying a plurality of control resource sets for monitoring downlink control information; means for identifying a control resource set from a plurality of control resource sets having a control resource set pool index value associated with the corresponding transmission / reception point index value; and means for selecting the default path loss reference signal resource based at least in part on the control resource set pool index value, wherein the default path loss reference signal resource comprises a periodic resource selected based at least in part on a spatial quasi co-located relationship associated with the identified set of control resources.

90. The apparatus of claim 69, wherein the control message is additional radio resource control signaling associated with the corresponding transmission / reception point index value, and wherein the configuration information is for a sounding reference signal associated with the corresponding transmission / reception point index value, and The component for determining the default path loss reference signal resource further includes: means for determining that the path loss reference signal is not configured via radio resource control signaling; as well as A means for selecting the default path loss reference signal resource according to the resource selection rule and the corresponding transmission / reception point index value based at least in part on the fact that the path loss reference signal is not configured and the configuration information is excluded, wherein the means for selecting the default path loss reference signal resource according to the resource selection rule comprises: means for identifying a synchronization signal block used to receive a master information block associated with said corresponding transmission / reception point index value; as well as Means for selecting the default path loss reference signal resource based at least in part on the identified synchronization signal block.

91. The apparatus of claim 69, wherein the means for determining the default path loss reference signal resource further comprises: means for determining that one or more higher layer parameters are not received at the UE; as well as means for selecting the default path loss reference signal resource according to the resource selection rule and the corresponding transmission / reception point index value based at least in part on one or more higher layer parameters not being received, wherein selecting the default path loss reference signal resource according to the resource selection rule comprises: means for identifying a synchronization signal block used to receive a master information block associated with said corresponding transmission / reception point index value; as well as Means for selecting the default path loss reference signal resource based at least in part on the identified synchronization signal block.

92. The apparatus of claim 69, wherein the control message is additional radio resource control signaling associated with the corresponding transmission / reception point index value, and wherein the configuration information is for a sounding reference signal associated with the corresponding transmission / reception point index value, and The component for determining the default path loss reference signal resource further includes: means for determining that the path loss reference signal is not configured via radio resource control signaling; as well as means for selecting the default path loss reference signal resource according to the resource selection rule and the corresponding transmission / reception point index value based at least in part on the path loss reference signal not being configured and the configuration information being excluded.

93. The apparatus of claim 92, wherein the means for selecting the default path loss reference signal resource according to the resource selection rule comprises: means for identifying a plurality of control resource sets for monitoring downlink control information; means for identifying a control resource set from a plurality of control resource sets having a lowest control resource set pool index value associated with the respective transmission / reception point index value, wherein the identified control resource set is within an active downlink bandwidth portion; as well as means for selecting the default path loss reference signal resource based at least in part on the lowest control resource set pool index value, wherein the default path loss reference signal resource comprises a periodic resource selected based at least in part on a spatial quasi co-located relationship associated with the identified set of control resources.

94. The apparatus of claim 92, wherein the means for selecting the default path loss reference signal resource according to the resource selection rule comprises: means for identifying a set of transmission configuration indicator states for a physical downlink shared channel; means for identifying, from said set of transmission configuration indicator states, a transmission configuration identifier associated with said corresponding transmission / reception point index value; as well as Means for selecting the default path loss reference signal resource based at least in part on the transmission configuration identifier, wherein a set of control resources associated with the corresponding transmission / reception point index value is located in a downlink bandwidth portion different from an active downlink bandwidth portion.

95. The apparatus of claim 69, wherein the means for determining the default path loss reference signal resource further comprises: means for determining that the path loss reference signal is not configured for the first transmission and the second transmission of the uplink signal, wherein the first transmission and the second transmission of the uplink are based at least in part on downlink control information received according to a single downlink control information scheme; and means for selecting the default path loss reference signal resource according to the resource selection rule and the corresponding transmission / reception point index value based at least in part on the path loss reference signal not being configured.

96. The apparatus of claim 95, wherein the means for selecting the default path loss reference signal resource according to the resource selection rule comprises: for said first transmission of said uplink signal, means for determining a first set of periodic reference signal resources based at least in part on a first transmission configuration indicator identifier value from a first pair of transmission configuration indicators; for said second transmission of said uplink signal, means for determining a second set of periodic reference signal resources based at least in part on a second transmission configuration indicator identifier value from a second pair of transmission configuration indicators; as well as Means for selecting the default path loss reference signal resource based at least in part on the first set of periodic reference signal resources and the second set of periodic reference signal resources.

97. The apparatus of claim 96, wherein the first transmission configuration indicator identifier value is a lowest transmission configuration indicator identifier value of the first pair of transmission configuration indicators, and wherein the second transmission configuration indicator identifier value is a lowest transmission configuration indicator identifier value of the second pair of transmission configuration indicators.

98. The apparatus of claim 95, wherein the means for selecting the default path loss reference signal resource according to the resource selection rule comprises: for the first transmission and the second transmission of the uplink signal, means for determining a set of periodic reference signal resources based at least in part on a pair of transmission configuration indicators from a plurality of pairs of transmission configuration indicators; and Means for selecting the default path loss reference signal resource based at least in part on the set of periodic reference signal resources.

99. The apparatus of claim 98, wherein the pair of transmission configuration indicators has a lowest sum of transmission configuration indicator identifier values, or has a highest sum of transmission configuration indicator identifier values, or corresponds to a first transmission configuration indicator code point having a multiple transmission configuration indicator state.

100. The apparatus of claim 95, wherein the means for selecting the default path loss reference signal resource according to the resource selection rule comprises: for the first transmission and the second transmission of the uplink signal, means for determining a first set of reference signal resources based at least in part on a single panel transmission and a second set of reference signal resources based on a predefined mapping between the first set of reference signal resources and the second set of reference signal resources; and Means for selecting the default path loss reference signal resource based at least in part on the first set of reference signal resources or the second set of reference signal resources, or any combination thereof.

101. The apparatus of claim 100, wherein the predefined mapping is based at least in part on one or more pairs of transmission configuration indicator states.

102. The apparatus of claim 95, wherein the uplink signal comprises data on a physical uplink shared channel, or control information on a physical uplink control channel, or a sounding reference signal.

103. A non-transitory computer readable medium storing code for wireless communication at a user equipment (UE), the code comprising instructions executable by a processor to: identifying respective transmit / receive point index values ​​corresponding to a first transmit / receive point and a second transmit / receive point, wherein the UE is configured to at least send a first transmission of an uplink signal to the first transmit / receive point using a first antenna panel and send a second transmission of the uplink signal to the second transmit / receive point using a second antenna panel different from the first antenna panel; determining a default path loss reference signal resource for one or more path loss reference signals associated with the first transmission and the second transmission of the uplink signal, the default path loss reference signal resource being based at least in part on a determination of whether a path loss reference signal is configured, the corresponding transmit / receive point index value, and a resource selection rule; and sending the one or more path loss reference signals using the default path loss reference signal resource, The instruction for determining the default path loss reference signal resource may be executed by the processor to perform the following operations: Determining that a control message associated with the corresponding transmission / reception point index value excludes configuration information for transmitting the one or more default path loss reference signals.

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