Media Access Control Layer Mapping for Path Loss Reference Signal

Abstract

Various aspects of the present disclosure generally relate to wireless communications. In some aspects, a user equipment may receive a medium access control layer message indicating a set of mappings between a set of path loss reference signals and one of the following: a set of physical uplink shared channel identifiers or a set of sounding reference signal identifiers; receive downlink control information activating a mapping in the set of mappings; and perform path loss measurements using the path loss reference signal identified by the activated mapping. Numerous other aspects are provided.

Description

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This patent application claims priority to PCT Patent Application No. PCT / CN2019 / 126997, entitled “MEDIUM ACCESS CONTROL LAYERMAPPING FOR PATHLOSS REFERENCE SIGNAL,” filed on December 20, 2019, and assigned to the assignee of this application. The disclosures of these prior applications are considered a part of and incorporated by reference into this patent application.

[0003] public domain

[0004] Aspects of the present disclosure relate generally to wireless communications and to techniques and apparatus for medium access control (MAC) layer mapping of path loss reference signals (RSs).

[0005] background

[0006] Wireless communication systems are widely deployed to provide a variety of telecommunication services, such as telephony, video, data, messaging, and broadcasts. Typical wireless communication systems may employ multiple access technologies capable of supporting communication with multiple users by sharing available system resources (e.g., bandwidth, transmit power, etc.). Examples of such multiple access technologies include code division multiple access (CDMA) systems, time division multiple access (TDMA) systems, frequency division multiple access (FDMA) systems, orthogonal frequency division multiple access (OFDMA) systems, single-carrier frequency division multiple access (SC-FDMA) systems, time division synchronous code division multiple access (TD-SCDMA) systems, and long term evolution (LTE). LTE / LTE-Advanced is a set of enhancements to the Universal Mobile Telecommunications System (UMTS) mobile standard promulgated by the Third Generation Partnership Project (3GPP).

[0007] A wireless communication network may include several base stations (BSs) capable of supporting communications for several user equipment (UEs). User equipment (UEs) may communicate with the base stations (BSs) via downlinks and uplinks. The downlink (or forward link) refers to the communication link from the BS to the UE, while the uplink (or reverse link) refers to the communication link from the UE to the BS. As will be described in more detail herein, a BS may be referred to as a Node B, gNB, access point (AP), radio head, transmit / receive point (TRP), new radio (NR) BS, 5G Node B, and so on.

[0008] The above multiple access technologies have been adopted in various telecommunication standards to provide a common protocol that enables different user equipment to communicate at the city, country, region, and even global levels. New Radio (NR) (which may also be referred to as 5G) is a set of enhancements to the LTE mobile standard promulgated by the Third Generation Partnership Project (3GPP). NR is designed to better support mobile broadband Internet access by improving spectrum efficiency, reducing costs, improving services, utilizing new spectrum, and using orthogonal frequency division multiplexing (OFDM) (CP-OFDM) with a cyclic prefix (CP) on the downlink (DL), using CP-OFDM and / or SC-FDM (e.g., also known as discrete Fourier transform spread OFDM (DFT-s-OFDM)) on the uplink (UL), and supporting beamforming, multiple input multiple output (MIMO) antenna technology and carrier aggregation for better integration with other open standards. However, as the demand for mobile broadband access continues to grow, there is a need for further improvements to LTE and NR technologies. Preferably, these improvements should be applicable to other multiple access technologies and telecommunication standards that adopt these technologies.

[0009] Overview

[0010] In some aspects, a wireless communication method performed by a user equipment (UE) may include: receiving a medium access control (MAC) layer message indicating a mapping set between a path loss reference signal (RS) identifier set and one of the following: a physical uplink shared channel (PUSCH) identifier set, or a sounding reference signal (SRS) identifier set; receiving downlink control information (DCI) activating a mapping in the mapping set; and performing path loss measurement using the path loss reference RS identified by the activated mapping.

[0011] In some aspects, a wireless communication method performed by a base station may include: transmitting a MAC layer message indicating a mapping set between a path loss reference RS identifier set and one of the following: a PUSCH power control identifier set, or a SRS resource set identifier set; transmitting a DCI that activates the mapping in the mapping set; and transmitting a path loss reference RS for path loss measurement based on the activated mapping.

[0012] In some aspects, a UE for wireless communication may include a memory and one or more processors operatively coupled to the memory. The memory and the at least one processor may be configured to: receive a MAC layer message indicating a set of mappings between a set of path loss reference RS identifiers and one of: a set of PUSCH power control identifiers or a set of SRS resource set identifiers; receive a DCI activating a mapping in the set of mappings; and perform path loss measurement using the path loss reference RS identified by the activated mapping.

[0013] In some aspects, a base station for wireless communication may include a memory and one or more processors operatively coupled to the memory. The memory and the at least one processor may be configured to: transmit a MAC layer message indicating a set of mappings between a set of path loss reference RS identifiers and one of: a set of PUSCH power control identifiers or a set of SRS resource set identifiers; transmit a DCI activating a mapping in the set of mappings; and transmit a path loss reference RS for path loss measurement according to the activated mapping.

[0014] In some aspects, a non-transitory computer-readable medium may store one or more instructions for wireless communication. The one or more instructions, when executed by one or more processors of a UE, may cause the one or more processors to: receive a MAC layer message indicating a set of mappings between a set of path loss reference RS identifiers and one of: a set of PUSCH power control identifiers or a set of SRS resource set identifiers; receive a DCI activating a mapping in the set of mappings; and perform path loss measurement using the path loss reference RS identified by the activated mapping.

[0015] In some aspects, a non-transitory computer-readable medium may store one or more instructions for wireless communication. The one or more instructions, when executed by one or more processors of a base station, may cause the one or more processors to: transmit a MAC layer message indicating a set of mappings between a set of path loss reference RS identifiers and one of the following: a set of PUSCH power control identifiers or a set of SRS resource set identifiers; transmit a DCI activating a mapping in the set of mappings; and transmit a path loss reference RS for path loss measurement according to the activated mapping.

[0016] In some aspects, an apparatus for wireless communication may include a device for receiving a MAC layer message indicating a mapping set between a path loss reference RS identifier set and one of: a PUSCH power control identifier set, or a SRS resource set identifier set; a device for receiving a DCI activating a mapping in the mapping set; and a device for performing path loss measurements using the path loss reference RS identified by the activated mapping.

[0017] In some aspects, an apparatus for wireless communication may include a device for transmitting a MAC layer message indicating a mapping set between a path loss reference RS identifier set and one of: a PUSCH power control identifier set, or a SRS resource set identifier set; a device for transmitting a DCI that activates a mapping in the mapping set; and a device for transmitting a path loss reference RS for path loss measurement based on the activated mapping.

[0018] Aspects generally include methods, apparatus (devices), systems, computer program products, non-transitory computer-readable media, user equipment, base stations, wireless communication devices, and / or processing systems as substantially described herein with reference to and as illustrated in the accompanying figures and description.

[0019] The foregoing has broadly outlined the features and technical advantages of examples according to the present disclosure in an effort to make the following detailed description better understood. Additional features and advantages will be described hereinafter. The concepts and specific examples disclosed can be readily used as a basis for modifying or designing other structures for implementing the same purposes as the present disclosure. Such equivalent constructions do not depart from the scope of the appended claims. The characteristics of the concepts disclosed herein, both in terms of their organization and method of operation, as well as the associated advantages, will be better understood by considering the following description in conjunction with the accompanying drawings. Each of the figures is provided for illustration and description purposes and is not intended to define limitations on the claims. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to understand in detail the features of the present disclosure set forth above, a more particular description of the content briefly summarized above may be obtained with reference to various aspects, some of which are illustrated in the accompanying drawings. It should be noted, however, that the accompanying drawings illustrate only certain typical aspects of the present disclosure and are not to be considered limiting of its scope, as the description may admit to other equally effective aspects. The same reference numerals in different drawings may identify the same or similar elements.

[0022] Figure 1 is a block diagram conceptually illustrating an example of a wireless communication network in accordance with various aspects of the present disclosure.

[0023] Figure 2is a block diagram conceptually illustrating an example of a base station and a UE in communication in a wireless communication network according to various aspects of the present disclosure.

[0024] Figure 3 is a diagram illustrating an example of signaling for MAC layer mapping of a path loss RS according to various aspects of the present disclosure.

[0025] Figure 4-7 is a diagram illustrating an example signal structure of a MAC layer message for indicating mapping of a path loss reference RS identifier to a physical uplink shared channel identifier according to various aspects of the present disclosure.

[0026] Figure 8-11 is a diagram illustrating an example signal structure of a MAC layer message for indicating mapping of a path loss reference RS identifier to a sounding reference signal identifier according to various aspects of the present disclosure.

[0027] Figure 12 is a diagram illustrating an example process, eg, performed by user equipment, in accordance with various aspects of the present disclosure.

[0028] Figure 13 is a diagram illustrating example processes performed, for example, by a base station, according to various aspects of the present disclosure.

[0029] Detailed description

[0030] The various aspects of the present disclosure are described more fully below with reference to the accompanying drawings. However, the present disclosure can be implemented in many different forms and should not be interpreted as being limited to any specific structure or function given throughout the present disclosure. On the contrary, these aspects are provided to make the present disclosure thorough and complete, and they will fully convey the scope of the present disclosure to those skilled in the art. Based on the teachings herein, those skilled in the art will appreciate that the scope of the present disclosure is intended to cover any aspect of the present disclosure disclosed herein, whether it is implemented independently of any other aspect of the present disclosure or implemented in combination. For example, any number of aspects set forth herein can be used to implement a device or practice method. In addition, the scope of the present disclosure is intended to cover such devices or methods that are practiced using a supplement to the various aspects of the present disclosure set forth herein or other other structures, functionality, or structure and functionality. It should be understood that any aspect of the present disclosure disclosed herein can be implemented by one or more elements of the claims.

[0031] Several aspects of telecommunications systems will now be presented with reference to various devices and techniques. These devices and techniques are described in the following detailed description and illustrated in the accompanying drawings by various blocks, modules, components, circuits, steps, processes, algorithms, etc. (collectively referred to as "elements"). These elements can be implemented using hardware, software, or a combination thereof. Whether such elements are implemented as hardware or software depends on the specific application and the design constraints imposed on the overall system.

[0032] It should be noted that while various aspects may be described herein using terminology typically associated with 3G and / or 4G wireless technologies, various aspects of the present disclosure may be applicable in communication systems based on other generations, such as 5G and later generations, including NR technology.

[0033] Figure 1 1 is a diagram illustrating a wireless network 100 in which various aspects of the present disclosure may be practiced. The wireless network 100 may be an LTE network or some other wireless network, such as a 5G or NR network. The wireless network 100 may include several BSs 110 (shown as BS 110a, BS 110b, BS 110c, and BS 110d) and other network entities. A BS is an entity that communicates with user equipment (UE) and may also be referred to as a base station, NR BS, Node B, gNB, 5G Node B (NB), access point, transmit reception point (TRP), etc. Each BS may provide communication coverage for a particular geographic area. In 3GPP, the term "cell" may refer to the coverage area of ​​a BS and / or the BS subsystem serving that coverage area, depending on the context in which the term is used.

[0034] A BS may provide communication coverage for a macro cell, a pico cell, a femto cell, and / or another type of cell. A macro cell may cover a relatively large geographic area (e.g., several kilometers in radius) and may allow unrestricted access by UEs with service subscriptions. A pico cell may cover a relatively small geographic area and may allow unrestricted access by UEs with service subscriptions. A femto cell may cover a relatively small geographic area (e.g., a residence) and may allow restricted access by UEs associated with the femto cell (e.g., UEs in a closed subscriber group (CSG)). A BS for a macro cell may be referred to as a macro BS. A BS for a pico cell may be referred to as a pico BS. A BS for a femto cell may be referred to as a femto BS or a home BS. In Figure 1In the example shown in FIG, BS 110a may be a macro BS for macro cell 102a, BS 110b may be a pico BS for pico cell 102b, and BS 110c may be a femto BS for femto cell 102c. A BS may support one or more (e.g., three) cells. The terms "eNB," "base station," "NR BS," "gNB," "TRP," "AP," "Node B," "5G NB," and "cell" may be used interchangeably herein.

[0035] In some aspects, the cells may not necessarily be stationary, and the geographic area of ​​the cells may move depending on the location of the mobile BS. In some aspects, the BSs may be interconnected to each other and / or to one or more other BSs or network nodes (not shown) in the wireless network 100 via various types of backhaul interfaces, such as direct physical connections, virtual networks, and / or the like using any suitable transport network.

[0036] The wireless network 100 may also include a relay station. A relay station is an entity that can receive transmissions of data from an upstream station (e.g., a BS or a UE) and send transmissions of the data to a downstream station (e.g., a UE or a BS). A relay station may also be a UE that can relay transmissions for other UEs. Figure 1 In the example shown in , relay BS 110d may communicate with macro BS 110a and UE 120d to facilitate communication between BS 110a and UE 120d. A relay BS may also be referred to as a relay station, relay base station, relay, etc.

[0037] The wireless network 100 may be a heterogeneous network including different types of BSs (e.g., macro BSs, pico BSs, femto BSs, relay BSs, etc.). These different types of BSs may have different transmit power levels, different coverage areas, and different impacts on interference in the wireless network 100. For example, a macro BS may have a high transmit power level (e.g., 5 to 40 watts), while a pico BS, a femto BS, and a relay BS may have a lower transmit power level (e.g., 0.1 to 2 watts).

[0038] The network controller 130 may be coupled to a set of BSs and may provide coordination and control of these BSs. The network controller 130 may communicate with each BS via a backhaul. These BSs may also communicate with each other directly or indirectly, for example, via a wireless or wired backhaul.

[0039] UEs 120 (e.g., 120a, 120b, 120c) may be dispersed throughout the wireless network 100, and each UE may be stationary or mobile. A UE may also be referred to as an access terminal, terminal, mobile station, subscriber unit, station, etc. A UE may be a cellular phone (e.g., a smartphone), a personal digital assistant (PDA), a wireless modem, a wireless communication device, a handheld device, a laptop computer, a cordless phone, a wireless local loop (WLL) station, a tablet, a camera, a gaming device, a netbook, a smartbook, an ultrabook, a medical device or equipment, a biometric sensor / device, a wearable device (e.g., a smart watch, smart clothing, smart glasses, a smart wristband, smart jewelry (e.g., a smart ring, a smart bracelet)), an entertainment device (e.g., a music or video device, or a satellite radio), a vehicle component or sensor, a smart meter / sensor, industrial manufacturing equipment, a global positioning system device, or any other suitable device configured to communicate via a wireless or wired medium.

[0040] Some UEs may be considered machine type communication (MTC) UEs, or evolved or enhanced machine type communication (eMTC) UEs. MTC and eMTC UEs include, for example, robots, drones, remote devices, sensors, meters, monitors, location tags, etc., which can communicate with a base station, another device (e.g., a remote device), or some other entity. A wireless node may provide connectivity to or to a network (e.g., a wide area network (such as the Internet) or a cellular network), for example, via a wired or wireless communication link. Some UEs may be considered Internet of Things (IoT) devices and / or may be implemented as NB-IoT (narrowband Internet of Things) devices. Some UEs may be considered customer premises equipment (CPE). UE 120 may be included inside a housing that houses components of UE 120, such as a processor component, a memory component, etc.

[0041] In general, any number of wireless networks may be deployed in a given geographic area. Each wireless network may support a specific radio access technology (RAT) and may operate on one or more frequencies. A RAT may also be referred to as a radio technology, air interface, etc. A frequency may also be referred to as a carrier, frequency channel, etc. Each frequency may support a single RAT in a given geographic area to avoid interference between wireless networks of different RATs. In some cases, NR or 5G RAT networks may be deployed.

[0042] In some aspects, two or more UEs 120 (e.g., shown as UE 120a and UE 120e) may communicate directly (e.g., without using base station 110 as an intermediary) using one or more sidelink channels. For example, the UEs 120 may communicate using peer-to-peer (P2P) communication, device-to-device (D2D) communication, vehicle-to-everything (V2X) protocols (e.g., which may include vehicle-to-vehicle (V2V) protocols, vehicle-to-infrastructure (V2I) protocols, etc.), mesh networks, etc. In this scenario, the UEs 120 may perform scheduling operations, resource selection operations, and / or other operations described elsewhere herein as being performed by the base station 110.

[0043] As indicated above, Figure 1 are provided as examples. Other examples may differ from those described in Figure 1 Examples described.

[0044] Figure 2 A block diagram shows a design 200 of a base station 110 and a UE 120, which may be Figure 1 One for each base station and one for each UE in . Base station 110 may be equipped with T antennas 234a through 234t, and UE 120 may be equipped with R antennas 252a through 252r, where in general T≧1 and R≧1.

[0045] At base station 110, transmit processor 220 may receive data for one or more UEs from data source 212, select one or more modulation and coding schemes (MCS) for each UE based at least in part on a channel quality indicator (CQI) received from the UE, process (e.g., encode and modulate) the data for each UE based at least in part on the MCS selected for the UE, and provide data symbols for all UEs. Transmit processor 220 may also process system information (e.g., for semi-static resource partitioning information (SRPI)) and control information (e.g., CQI requests, grants, upper layer signaling, etc.), and provide overhead symbols and control symbols. Transmit processor 220 may also generate reference symbols for reference signals (e.g., a cell-specific reference signal (CRS)) and synchronization signals (e.g., a primary synchronization signal (PSS) and a secondary synchronization signal (SSS)). A transmit (TX) multiple-input, multiple-output (MIMO) processor 230 may perform spatial processing (e.g., precoding) on ​​data symbols, control symbols, overhead symbols, and / or reference symbols, as applicable, and may provide T output symbol streams to T modulators (MODs) 232a through 232t. Each modulator 232 may process a respective output symbol stream (e.g., for OFDM, etc.) to obtain an output sample stream. Each modulator 232 may further process (e.g., convert to analog, amplify, filter, and frequency upconvert) the output sample stream to obtain a downlink signal. The T downlink signals from modulators 232a through 232t may be transmitted via T antennas 234a through 234t, respectively. According to various aspects described in greater detail below, position coding may be utilized to generate synchronization signals to convey additional information.

[0046] At UE 120, antennas 252a through 252r may receive downlink signals from base station 110 and / or other base stations and may provide received signals to demodulators (DEMODs) 254a through 254r, respectively. Each demodulator 254 may condition (e.g., filter, amplify, downconvert, and digitize) the received signal to obtain input samples. Each demodulator 254 may further process the input samples (e.g., for OFDM, etc.) to obtain received symbols. A MIMO detector 256 may obtain received symbols from all R demodulators 254a through 254r, perform MIMO detection on the received symbols where applicable, and provide detected symbols. A receive processor 258 may process (e.g., demodulate and decode) the detected symbols, provide decoded data for UE 120 to a data sink 260, and provide decoded control information and system information to a controller / processor 280. The channel processor may determine reference signal received power (RSRP), received signal strength indicator (RSSI), reference signal received quality (RSRQ), channel quality indicator (CQI), etc. In some aspects, one or more components of UE 120 may be included in a housing.

[0047] On the uplink, at the UE 120, a transmit processor 264 may receive and process data from a data source 262 and control information (e.g., for reports including RSRP, RSSI, RSRQ, CQI, etc.) from the controller / processor 280. The transmit processor 264 may also generate reference symbols for one or more reference signals. The symbols from the transmit processor 264 may be precoded by a TX MIMO processor 266, if applicable, further processed by modulators 254a through 254r (e.g., for DFT-s-OFDM, CP-OFDM, etc.), and transmitted to the base station 110. At the base station 110, uplink signals from the UE 120 and other UEs may be received by the antenna 234, processed by the demodulator 232, detected by the MIMO detector 236, if applicable, and further processed by the receive processor 238 to obtain decoded data and control information sent by the UE 120. Receive processor 238 may provide decoded data to data sink 239 and decoded control information to controller / processor 240. Base station 110 may include communication unit 244 and communicate with network controller 130 via communication unit 244. Network controller 130 may include communication unit 294, controller / processor 290, and memory 292.

[0048] The controller / processor 240 of the base station 110, the controller / processor 280 of the UE 120, and / or Figure 2Any other component(s) of the controller / processor 240 of the base station 110, the controller / processor 280 of the UE 120, and / or the like may perform one or more techniques associated with medium access control (MAC) layer indication for mapping of path loss reference signals, as described in more detail elsewhere herein. Figure 2 Any other component of the may perform or direct e.g. Figure 12 The process of 1200 Figure 13 1300, and / or operations of other processes as described herein. Memories 242 and 282 may store data and program codes for base station 110 and UE 120, respectively. In some aspects, memory 242 and / or memory 282 may include: a non-transitory computer-readable medium storing one or more instructions for wireless communication. For example, the one or more instructions, when executed by one or more processors of base station 110 and / or UE 120, may perform or direct, for example, Figure 12 The process of 1200 Figure 13 The scheduler 246 may schedule UEs for data transmission on the downlink and / or uplink.

[0049] In some aspects, UE 120 may include: means for receiving a MAC layer message indicating a mapping set between a path loss reference signal (RS) set and one of: a physical uplink shared channel (PUSCH) identifier set or a sounding reference signal (SRS) identifier set; means for receiving downlink control information (DCI) activating a mapping in the mapping set; means for performing path loss measurement using the path loss RS identified by the activated mapping; means for receiving information configuring a maximum number of path loss reference RS identifiers that can be configured in the MAC layer message; and the like. In some aspects, such means may include in conjunction with Figure 2 One or more components of the UE 120 are depicted, such as the controller / processor 280, transmit processor 264, TX MIMO processor 266, MOD 254, antenna 252, DEMOD 254, MIMO detector 256, receive processor 258, and so forth.

[0050] In some aspects, the base station 110 may include: means for transmitting a MAC layer message indicating a mapping set between a path loss reference RS identifier set and one of the following: a PUSCH power control identifier set or an SRS resource set identifier set; means for transmitting DCI activating a mapping in the mapping set; means for transmitting a path loss RS for path loss measurement according to the activated mapping; means for transmitting information configuring a maximum number of path loss reference RS identifiers that can be configured in a MAC layer message; and the like. In some aspects, such means may include in combination Figure 2 One or more components of base station 110 are depicted, such as antenna 234, DEMOD 232, MIMO detector 236, receive processor 238, controller / processor 240, transmit processor 220, TX MIMO processor 230, MOD 232, antenna 234, and so forth.

[0051] As indicated above, Figure 2 are provided as examples. Other examples may differ from those described in Figure 2 Examples described.

[0052] A UE may perform path loss measurement to determine a path loss value for a channel between the UE and a base station. For example, the UE may perform path loss measurement for power control and beam measurement purposes for uplink transmissions such as PUSCH, SRS (e.g., aperiodic SRS (AP-SRS) or semi-persistent SRS (SP-SRS)), physical uplink control channel (PUCCH), etc.

[0053] The UE may use the path loss RS to perform path loss measurement. The path loss RS may be mapped to a synchronization signal block (SSB) index or a channel state information reference signal (CSI-RS) resource index with reference to the path loss reference RS identifier of the path loss RS. For example, the UE may be configured (e.g., using radio resource control (RRC) signaling, etc.) with one or more configurations for mapping the path loss reference RS identifier to different SSB indices or CSI-RS resource indices. In addition, the UE may be configured with one or more mappings between a path loss reference RS identifier (which is mapped to different SSB indices or CSI-RS indices) and a corresponding PUSCH power control identifier or SRS resource set identifier. The PUSCH power control identifier may be used when the UE is to perform PUSCH power control or beam measurement, and the SRS resource set identifier may be used when the UE is to perform SRS power control or beam management.

[0054] The UE may receive downlink control information (DCI) including an SRS resource indicator field indicating a PUSCH power control identifier or an SRS resource set identifier, and may use a CSI-RS or SSB index corresponding to a path loss reference RS identifier mapped to the PUSCH power control identifier or SRS resource set identifier indicated by the DCI. This may be referred to as activating the mapping or updating the mapping. In other words, the DCI may indicate a PUSCH power control identifier or an SRS resource set identifier (depending on the type of power control to be performed by the UE), and the UE may determine the path loss reference RS index mapped to the PUSCH power control identifier or the SRS resource set identifier, and may then identify an RS to be used as a path loss RS based at least in part on which RS (of the CSI-RS and SSB) is configured to be associated with the path loss reference RS index.

[0055] Reconfiguring the mapping between the path loss reference RS index and the PUSCH power control identifier or SRS resource set identifier can be beneficial. For example, the UE may be configured with a limited number of mappings, or the UE's operating conditions may change, requiring an updated mapping. However, reconfiguring the mapping using higher-layer communication (such as RRC signaling) can involve significant latency and complexity, thereby consuming radio and computing resources of the UE and the corresponding base station.

[0056] Some of the techniques and apparatus described herein provide for medium access control (MAC) layer reconfiguration of the mapping for path loss RS measurements. For example, some of the techniques and apparatus described herein provide signaling structures and procedures for MAC layer reconfiguration, such as various explicit and implicit signaling techniques. In this way, the configuration flexibility of the mapping for path loss RS measurements can be improved and latency can be reduced, thereby reducing computational resource usage.

[0057] Figure 3 is a diagram illustrating an example 300 of signaling for MAC layer mapping of a path loss RS according to various aspects of the present disclosure. As shown, example 300 includes a UE 120 and a BS 110.

[0058] like Figure 3, and indicated by reference numeral 310, BS 110 may provide configuration information to UE 120. For example, the configuration information may include RRC signaling, etc. The configuration information may identify a mapping between a path loss reference RS identifier (or a set of path loss reference RS identifiers) and RSs (such as an SSB identified by an SSB index, a CSI-RS identified by a CSI-RS index, etc.). In some aspects, when the path loss reference RS identifier is to be used for PUSCH power control, the path loss reference RS identifier may be a value of a parameter PUSCH-PathlossReferenceRS-ID. In some aspects, when the path loss reference RS identifier is to be used for AP-SRS / SP-SRS power control, the path loss reference RS identifier may be a value of a parameter pathlossReferenceRS. In some aspects, the path loss reference RS identifier may be referred to as a path loss RS identifier.

[0059] As indicated by reference numeral 320, BS 110 may provide a MAC layer message to UE 120. The MAC layer message may include a MAC control element (CE) or multiple MAC-CEs. In some aspects, the MAC layer message may identify a set of mappings between a set of pathloss reference RS identifiers and a set of PUSCH power control identifiers (e.g., in a one-to-one configuration, a many-to-one configuration, or a one-to-many configuration). For example, the MAC layer message may identify a set of mappings between PUSCH-PathlossReferenceRS-ID and a parameter sri-PUSCH-PowerControlId. In some aspects, the MAC layer message may identify a set of mappings between a set of pathloss reference RS identifiers and a set of SRS resource set identifiers. For example, the MAC layer message may identify a set of mappings between pathlossReferenceRS and a set of values ​​for srs-ResourceSetID.

[0060] An example of a message structure for a MAC layer message that provides a mapping between a path loss reference RS identifier and a PUSCH power control identifier is given in Figure 4-7 An example of the message structure of a MAC layer message used to provide a mapping between a path loss reference RS identifier and an SRS resource set identifier is shown in Figure 8-11 Shown in.

[0061] As shown by reference numeral 330, BS 110 may provide a DCI activating a PUSCH power control identifier or an SRS resource set identifier. For example, the SRS Resource Indicator (SRI) field of the DCI may indicate the value of sri-PUSCH-PowerControlId associated with a mapping in the mapping set provided to UE 120 in conjunction with reference numeral 320. As another example, a field of the DCI may indicate an SRS resource set identifier or a value related to srs-ResourceSetID. As shown by reference numeral 340, BS 110 may transmit a path loss RS to UE 120. The path loss RS may include an RS corresponding to the PUSCH power control identifier or SRS resource set identifier activated by the DCI, and UE 120 may identify the RS by referring to the mapping associated with the activated PUSCH power control identifier or SRS resource set identifier and the configuration of the path loss reference RS identifier to which the PUSCH power control identifier or SRS resource set identifier is mapped. As shown by reference numeral 350, UE 120 may use the path loss RS to perform path loss measurement. In some aspects, UE 120 may use the path loss RS to perform power control operations or beam measurement operations, or may perform uplink transmissions (e.g., PUSCH, AP-SRS, SP-SRS, PUCCH, etc.) based on the power control operations (not shown). In this way, BS 110 may use MAC layer signaling to signal the UE with a mapping for path loss measurement, which reduces latency and saves computational resources relative to RRC layer signaling.

[0062] As indicated above, Figure 3 are provided as examples. Other examples may differ from those described in Figure 3 Examples described.

[0063] Figure 4-7 are diagrams illustrating examples 400 , 500 , 600 , 700 of signal structures of a MAC layer message for indicating mapping of a path loss reference RS identifier to a PUSCH power control identifier according to various aspects of the present disclosure. Figure 8-11 1 is a diagram illustrating examples 800, 900, 1000, 1100 of signal structures of MAC layer messages for indicating mapping of path loss RS to sounding reference signal identifiers according to various aspects of the present disclosure. Figure 4-11 For example, Figure 4 The horizontal axis shown in the reference numeral 410 indicates a bit column. For example, Figure 4 The rightmost column in may represent the corresponding octets 1 to N (in Figure 4 The right side of is shown as the first bit of Oct 1 to Oct N), and so on.

[0064] Figure 4 An example of an explicit indication of a mapping between a path loss reference RS identifier (shown as PUSCH Path Loss Reference RS ID) and a PUSCH power control identifier (shown as SRI PUSCH Power Control ID) is shown. As shown by reference numeral 420, in some aspects, a MAC layer message may indicate a serving cell identifier and a bandwidth part (BWP) identifier regarding the mapping (as also in Examples 500 through 1100). In Example 400, the MAC layer message explicitly identifies a set of path loss reference RS identifiers (shown as PUSCH Path Loss Reference RS ID1 through PUSCH Path Loss Reference RS ID M ) and a corresponding set of PUSCH power control identifiers (shown as SRI PUSCH power control ID1 to SRI PUSCH power control ID M ). For example, there may be a one-to-one mapping between each PUSCH path loss reference RS ID and each SRI PUSCH power control ID (e.g., PUSCH path loss reference RS ID1 may be mapped to SRI PUSCH power control ID1, and so on). The MAC layer message of example 400 may be particularly helpful for explicitly reconfiguring a large number of mappings without the overhead associated with additional or different messages.

[0065] Figure 5 An example of indicating the mapping between the path loss reference RS identifier and the PUSCH power control identifier using a bitmap is shown. For example, the P i The field may correspond to a corresponding path loss reference RS identifier. The UE (eg, UE 120) may be configured (eg, using RRC signaling, etc.) with an indication of the P i The mapping between the field and the corresponding path loss reference RS identifier. i field is activated (for example, if P i field is set to a specific value), the MAC layer message may include the i The PUSCH power control identifier corresponding to the path loss reference RS identifier of the field. As an example, assuming that P1 and P2 are activated, assuming that P1 is mapped to the first path loss reference RS identifier, and assuming that P2 is mapped to the second path loss reference RS identifier. In this case, the PUSCH power control identifier shown by reference numeral 520 may be mapped to the first path loss reference RS identifier, and the PUSCH power control identifier shown by reference numeral 530 may be mapped to the second path loss reference RS identifier. For example, the PUSCH power control identifier may be mapped according to the activated P iThe order of the field values ​​is mapped to a path loss reference RS identifier.The example 500 may provide lower overhead than, for example, explicit signaling schemes.

[0066] Figure 6 An example of indicating a mapping set based at least in part on the order or sequence of a set of path loss reference RS identifiers in a MAC layer message is shown. For example, in example 600, the MAC layer message may indicate the respective path loss reference RS identifiers, and the UE may determine these mappings based at least in part on the order associated with the corresponding PUSCH power control identifiers. For example, a first path loss reference RS identifier (e.g., PUSCH path loss reference RS ID1 shown by reference numeral 610) may be mapped to a first PUSCH power control identifier (e.g., SRI-PUSCH-PowerControlId1), a second path loss reference RS identifier shown by reference numeral 620 may be mapped to a second PUSCH power control identifier, and so on. In this case, the UE may be configured (e.g., using RRC signaling, etc.) with a set of path loss reference RS identifiers, and the MAC layer message may indicate or select how the set of path loss reference RS identifiers will be mapped to the set of PUSCH power control identifiers. In some aspects, the UE may be configured with a list of PUSCH power control identifiers (e.g., that identifies the order or sequence of the PUSCH power control identifiers), or may receive information identifying or indicating the list of PUSCH power control identifiers. Example 600 may use a smaller message size than explicit or bitmap-based indications and may involve more configuration overhead.

[0067] Figure 7 An example of an indication of a mapping set based at least in part on a set of table entries identifying a mapping set between a set of path loss reference RS identifiers and a set of PUSCH power control identifiers is shown. In example 700, the UE may be configured (e.g., using RRC signaling, etc.) with a table having multiple rows. The rows of the table may identify mappings between path loss reference RS identifiers and PUSCH power control identifiers. In some aspects, the table may exhaustively list mappings between path loss reference RS identifiers and PUSCH power control identifiers. For example, assuming the path loss reference RS identifier is {ABC} and the PUSCH power control identifier is {DEF}, the table may include [AD, AE, AF, BD, BE, BF, CD, CE, CF]. This may improve the versatility of the mapping procedure. In some aspects, the table may include a subset of possible mappings between path loss reference RS identifiers and PUSCH power control identifiers. This may reduce the size of the table, thereby saving computational resources.

[0068] The MAC layer message may identify one or more table entries. For example, the MAC layer message may include a field (shown as T ) indicating the corresponding mapping between the path loss reference RS identifier and the corresponding PUSCH power control identifier. i The table-based approach can reduce the size of MAC layer messages and may increase RRC layer overhead.

[0069] Figure 8 An example of an explicit indication of a mapping between a path loss reference RS identifier (shown as Path Loss Reference RS ID) and an SRS resource set identifier (shown as SRS Resource Set ID) is shown. In example 800, a MAC layer message explicitly identifies a set of path loss reference RS identifiers (shown as Path Loss Reference RS ID1 to Path Loss Reference RS ID M ) and a corresponding set of SRS resource set identifiers (shown as SRS resource set ID1 to SRS resource set ID M For example, there may be a one-to-one mapping between each path loss reference RS ID and each SRS resource set ID (e.g., path loss reference RS ID1 may be mapped to SRS resource set ID1, and so on). The MAC layer message of example 800 may be particularly useful for explicitly reconfiguring a large number of mappings without the overhead associated with additional or different messages.

[0070] Figure 9 An example of indicating the mapping between the path loss reference RS identifier and the SRS resource set identifier using a bitmap is shown. For example, the P shown by reference numeral 910 i The field may correspond to a corresponding path loss reference RS identifier. The UE (eg, UE 120) may be configured (eg, using RRC signaling, etc.) with an indication of the P i The mapping between the field and the corresponding path loss reference RS identifier. i field is activated (for example, if P i field is set to a specific value), the MAC layer message may include the i The SRS resource set identifier corresponding to the path loss reference RS identifier of the field. As an example, assuming that P1 and P2 are activated, assuming that P1 is mapped to the first path loss reference RS identifier, and assuming that P2 is mapped to the second path loss reference RS identifier. In this case, the SRS resource set identifier shown by reference numeral 920 may be mapped to the first path loss reference RS identifier, and the SRS resource set identifier shown by reference numeral 930 may be mapped to the second path loss reference RS identifier. For example, the SRS resource set identifier may be mapped according to the activated P iThe order of the field values ​​is mapped to a path loss reference RS identifier.The example 900 may provide lower overhead than, for example, explicit signaling schemes.

[0071] Figure 10 An example of indicating a mapping set based at least in part on the order or sequence of a set of path loss reference RS identifiers in a MAC layer message is shown. For example, in example 1000, the MAC layer message may indicate the respective path loss reference RS identifiers, and the UE may determine these mappings based at least in part on the order associated with the corresponding SRS resource set identifiers. For example, a first path loss reference RS identifier (e.g., path loss reference RS ID1) may be mapped to a first SRS resource set identifier (e.g., SRS resource set ID1), a second path loss reference RS identifier may be mapped to a second SRS resource set identifier, and so on. In this scenario, the UE may be configured (e.g., using RRC signaling, etc.) with a set of path loss reference RS identifiers, and the MAC layer message may indicate how the set of path loss reference RS identifiers will be mapped to a set of SRS resource set identifiers. In some aspects, the UE may be configured with a list of SRS resource set identifiers (e.g., which identifies the order or sequence of the SRS resource set identifiers), or may receive information identifying or indicating the list of SRS resource set identifiers. Example 1000 may use smaller message sizes than explicit or bitmap-based indications and may involve more configuration overhead.

[0072] Figure 11 An example of an indication of a mapping set based at least in part on a set of table entries identifying a mapping set between a set of path loss reference RS identifiers and a set of SRS resource set identifiers is shown. In example 1100, the UE may be configured (e.g., using RRC signaling, etc.) with a table having multiple rows. The rows of the table may identify mappings between path loss reference RS identifiers and SRS resource set identifiers. In some aspects, the table may exhaustively list mappings between path loss reference RS identifiers and SRS resource set identifiers. For example, assuming the path loss reference RS identifier is {ABC} and the SRS resource set identifier is {D EF}, the table may include [AD, AE, AF, BD, BE, BF, CD, CE, CF]. This may improve the versatility of the mapping procedure. In some aspects, the table may include a subset of possible mappings between path loss reference RS identifiers and SRS resource set identifiers. This may reduce the size of the table, thereby saving computational resources.

[0073] The MAC layer message may identify one or more table entries. For example, the MAC layer message may include a field (shown as T ) indicating the corresponding mapping between the path loss reference RS identifier and the corresponding SRS resource set identifier. iThe table-based approach can reduce the size of MAC layer messages and may increase RRC layer overhead.

[0074] Figure 12 is a diagram illustrating an example process 1200, performed, for example, by a UE, in accordance with various aspects of the present disclosure. Example process 1200 is an example in which a UE (eg, UE 120, etc.) performs operations associated with MAC layer mapping for path loss reference signals.

[0075] like Figure 12 As shown in , in some aspects, process 1200 may include receiving a MAC layer message indicating a set of mappings between a set of path loss reference RS identifiers and one of: a set of PUSCH power control identifiers or a set of SRS resource set identifiers (block 1210). For example, a UE (e.g., using antenna 252, DEMOD 254, MIMO detector 256, receive processor 258, controller / processor 280, etc.) may receive a MAC layer message indicating a set of mappings between a set of path loss reference RS identifiers and one of: a set of PUSCH power control identifiers or a set of SRS resource set identifiers, as described above.

[0076] like Figure 12 As further shown in FIG. 1 , in some aspects, process 1200 may include receiving a DCI activating a mapping in the set of mappings (block 1220). For example, the UE (e.g., using antenna 252, DEMOD 254, MIMO detector 256, receive processor 258, controller / processor 280, etc.) may receive the DCI activating a mapping in the set of mappings, as described above.

[0077] like Figure 12 As further shown in FIG. 1 , in some aspects, process 1200 may include performing path loss measurements using the path loss RS identified by the activated mapping (block 1230). For example, the UE (e.g., using antenna 252, DEMOD 254, MIMO detector 256, receive processor 258, controller / processor 280, etc.) may perform path loss measurements using the path loss RS identified by the activated mapping, as described above.

[0078] Process 1200 may include additional aspects, such as any single aspect or any combination of aspects described below and / or in conjunction with one or more other processes described elsewhere herein.

[0079] In a first aspect, the MAC layer message explicitly identifies a path loss reference RS identifier set and a PUSCH power control identifier set.

[0080] In a second aspect, alone or in combination with the first aspect, the path loss reference RS identifier set is included in a plurality of path loss reference RS identifiers, the MAC layer message indicates that a mapping set for the path loss reference RS identifier set is to be updated, and the MAC layer message identifies a PUSCH power control identifier set.

[0081] In a third aspect, alone or in combination with one or more of the first and second aspects, the MAC layer message indicates the mapping set using a bitmap.

[0082] In a fourth aspect, alone or in combination with one or more of the first to third aspects, process 1200 includes receiving information configuring a maximum number of path loss reference RS identifiers that can be configured in a MAC layer message.

[0083] In a fifth aspect, alone or in combination with one or more of the first to fourth aspects, information configuring a maximum number of path loss reference RS identifiers configurable in a MAC layer message is received using radio resource control signaling.

[0084] In a sixth aspect, alone or in combination with any one or more of the first to fifth aspects, the MAC layer message indicates the mapping set based at least in part on an order or sequence of the path loss reference RS identifier set in the MAC layer message.

[0085] In a seventh aspect, either alone or in combination with any one or more of the first to sixth aspects, the order or sequence of the path loss reference RS identifier sets in the MAC layer message corresponds to the order or sequence of the PUSCH power control identifier sets or the SRS resource set identifier sets, and wherein the information identifying the order or sequence of the PUSCH power control identifier sets or the SRS resource set identifier sets is received using radio resource control signaling.

[0086] In an eighth aspect, alone or in combination with any one or more of the first to seventh aspects, the MAC layer message indicates a set of table entries identifying a set of mappings between a set of path loss reference RS identifiers and a set of PUSCH power control identifiers.

[0087] In a ninth aspect, alone or in combination with one or more of the first to eighth aspects, the set of table entries is selected from a table, and the information identifying the table is received using radio resource control signaling.

[0088] In a tenth aspect, alone or in combination with one or more of the first to ninth aspects, the set of SRS resource set identifiers is associated with a semi-persistent SRS resource set or an aperiodic SRS resource set.

[0089] In an eleventh aspect, alone or in combination with one or more of the first to tenth aspects, the MAC layer message explicitly identifies a path loss reference RS identifier set and an SRS resource set identifier set.

[0090] In the twelfth aspect, alone or in combination with the first to eleventh aspects, the path loss reference RS identifier set is included in a plurality of path loss reference RS identifiers, the MAC layer message indicates that a mapping set for the path loss reference RS identifier set is to be updated, and the MAC layer message identifies the SRS resource set identifier set.

[0091] In a thirteenth aspect, alone or in combination with one or more of the first to twelfth aspects, the MAC layer message indicates the mapping set using a bitmap.

[0092] In a fourteenth aspect, alone or in combination with any one or more of the first to thirteenth aspects, the MAC layer message indicates a set of table entries identifying a set of mappings between a set of path loss reference RS identifiers and a set of SRS resource set identifiers.

[0093] although Figure 12 Example blocks of process 1200 are shown, but in some aspects, process 1200 may include Figure 12 12. In some embodiments, the process 1200 may include additional blocks, fewer blocks, different blocks, or differently arranged blocks than those depicted in FIG. Additionally or alternatively, two or more blocks of process 1200 may be executed in parallel.

[0094] Figure 13 is a diagram illustrating an example process 1300, performed, for example, by a base station, in accordance with various aspects of the present disclosure. Example process 1300 is an example in which a base station (eg, BS 110, etc.) performs operations associated with MAC layer mapping for path loss reference signals.

[0095] like Figure 13 As shown, in some aspects, process 1300 may include transmitting a MAC layer message indicating a set of mappings between a set of path loss reference RS identifiers and one of: a set of PUSCH power control identifiers or a set of SRS resource set identifiers (block 1310). For example, a base station (e.g., using controller / processor 240, transmit processor 220, TX MIMO processor 230, MOD 232, antenna 234, etc.) may transmit a MAC layer message indicating a set of mappings between a set of path loss reference RS identifiers and one of: a set of PUSCH power control identifiers or a set of SRS resource set identifiers, as described above.

[0096] like Figure 13 As further shown, in some aspects, process 1300 may include transmitting DCI activating a mapping in the set of mappings (block 1320). For example, a base station (e.g., using controller / processor 240, transmit processor 220, TX MIMO processor 230, MOD 232, antenna 234, etc.) may transmit DCI activating a mapping in the set of mappings, as described above.

[0097] like Figure 13 As further shown, in some aspects, process 1300 may include transmitting a path loss RS for path loss measurement according to the activated mapping (block 1330). For example, a base station (e.g., using controller / processor 240, transmit processor 220, TX MIMO processor 230, MOD 232, antenna 234, etc.) may transmit a path loss RS for path loss measurement according to the activated mapping, as described above.

[0098] Process 1300 may include additional aspects, such as any single aspect or any combination of aspects described below and / or in conjunction with one or more other processes described elsewhere herein.

[0099] In a first aspect, the MAC layer message explicitly identifies a path loss reference RS identifier set and a PUSCH power control identifier set.

[0100] In a second aspect, alone or in combination with the first aspect, the path loss reference RS identifier set is included in a plurality of path loss reference RS identifiers, the MAC layer message indicates that a mapping set for the path loss reference RS identifier set is to be updated, and the MAC layer message identifies a PUSCH power control identifier set.

[0101] In a third aspect, alone or in combination with one or more of the first and second aspects, the MAC layer message indicates the mapping set using a bitmap.

[0102] In a fourth aspect, alone or in combination with one or more of the first to third aspects, process 1300 includes transmitting information configuring a maximum number of path loss reference RS identifiers that can be configured in a MAC layer message.

[0103] In a fifth aspect, alone or in combination with one or more of the first to fourth aspects, information configuring a maximum number of path loss reference RS identifiers configurable in a MAC layer message is transmitted using radio resource control signaling.

[0104] In a sixth aspect, alone or in combination with any one or more of the first to fifth aspects, the MAC layer message indicates the mapping set based at least in part on an order or sequence of the path loss reference RS identifier set in the MAC layer message.

[0105] In a seventh aspect, either alone or in combination with any one or more of the first to sixth aspects, the order or sequence of the path loss reference RS identifier sets in the MAC layer message corresponds to the order or sequence of the PUSCH power control identifier sets or the SRS resource set identifier sets, and wherein the information identifying the order or sequence of the PUSCH power control identifier sets or the SRS resource set identifier sets is transmitted using radio resource control signaling.

[0106] In an eighth aspect, alone or in combination with any one or more of the first to seventh aspects, the MAC layer message indicates a set of table entries identifying a set of mappings between a set of path loss reference RS identifiers and a set of PUSCH power control identifiers.

[0107] In a ninth aspect, alone or in combination with one or more of the first to eighth aspects, the set of table entries is selected from a table, and the information identifying the table is transmitted using radio resource control signaling.

[0108] In a tenth aspect, alone or in combination with one or more of the first to ninth aspects, the set of SRS resource set identifiers is associated with a semi-persistent SRS resource set or an aperiodic SRS resource set.

[0109] In an eleventh aspect, alone or in combination with one or more of the first to tenth aspects, the MAC layer message explicitly identifies a path loss reference RS identifier set and an SRS resource set identifier set.

[0110] In the twelfth aspect, alone or in combination with the first to eleventh aspects, the path loss reference RS identifier set is included in a plurality of path loss reference RS identifiers, the MAC layer message indicates that a mapping set for the path loss reference RS identifier set is to be updated, and the MAC layer message identifies the SRS resource set identifier set.

[0111] In a thirteenth aspect, alone or in combination with one or more of the first to twelfth aspects, the MAC layer message indicates the mapping set using a bitmap.

[0112] In a fourteenth aspect, alone or in combination with any one or more of the first to thirteenth aspects, the MAC layer message indicates a set of table entries identifying a set of mappings between a set of path loss reference RS identifiers and a set of SRS resource set identifiers.

[0113] although Figure 13 Example blocks of process 1300 are shown, but in some aspects, process 1300 may include Figure 13 1300. In some embodiments, the process 1300 may include additional blocks, fewer blocks, different blocks, or differently arranged blocks than those depicted in FIG. Additionally or alternatively, two or more blocks of process 1300 may be executed in parallel.

[0114] The foregoing disclosure provides illustration and description, but is not intended to be exhaustive or to limit the aspects to the precise form disclosed. Modifications and variations may be made in light of the above disclosure or may be acquired from practice of the aspects.

[0115] As used herein, the term "component" is intended to be broadly interpreted as hardware, firmware, and / or a combination of hardware and software. As used herein, a processor is implemented using hardware, firmware, and / or a combination of hardware and software.

[0116] As used herein, satisfying a threshold may refer to a value being greater than a threshold, greater than or equal to a threshold, less than a threshold, less than or equal to a threshold, equal to a threshold, not equal to a threshold, etc., depending on the context.

[0117] It will be apparent that the systems and / or methods described herein can be implemented in various forms of hardware, firmware, and / or a combination of hardware and software. The actual dedicated control hardware or software code used to implement these systems and / or methods does not limit the aspects. Thus, the operation and behavior of these systems and / or methods are described herein without reference to specific software code—it is understood that software and hardware can be designed to implement these systems and / or methods based, at least in part, on the description herein.

[0118] Although specific feature combinations are described in the claims and / or disclosed in the specification, these combinations are not intended to limit the disclosure of the various aspects. In fact, many of these features can be combined in a manner not specifically described in the claims and / or not disclosed in the specification. Although each dependent claim listed below can be directly subordinate to only one claim, the disclosure of the various aspects includes that each dependent claim is combined with each other claim in this group of claims. A phrase quoting "at least one of" a list of items refers to any combination of these items, including single members. As an example, "at least one of a, b or c" is intended to cover: a, b, c, ab, ac, bc, and abc, as well as any combination with multiple identical elements (e.g., aa, aaa, aab, aac, abb, acc, bb, bbb, bbc, cc, and ccc, or any other arrangement of a, b and c).

[0119] The elements, actions or instructions used herein should not be interpreted as critical or necessary unless explicitly described as such. Moreover, as used herein, the articles "one" and "a" are intended to include one or more items and can be used interchangeably with "one or more". Furthermore, as used herein, the terms "set" and "group" are intended to include one or more items (e.g., related items, non-related items, a combination of related and non-related items, etc.) and can be used interchangeably with "one or more". Where intended to have only one item, the phrase "only one" or similar language is used. Furthermore, as used herein, the terms "having", "containing", "comprising" etc. are intended to be open terms. Furthermore, the phrase "based on" is intended to mean "based at least in part on", unless otherwise explicitly stated.

Claims

1. A method for performing wireless communication by a user equipment (UE), comprising: A medium access control (MAC) layer message is received, the MAC layer message indicating a set of mappings between a set of path loss reference signal (RS) identifiers and one of: Physical Uplink Shared Channel (PUSCH) power control identifier set, or a sounding reference signal (SRS) resource set identifier set; receiving downlink control information (DCI) activating a mapping in the set of mappings; as well as Path loss measurements are performed using the path loss RS identified by the activated mapping.

2. The method of claim 1, wherein the MAC layer message explicitly identifies the path loss reference RS identifier set and the PUSCH power control identifier set.

3. The method of claim 1, wherein the path loss reference RS identifier set is included in a plurality of path loss reference RS identifiers, wherein the MAC layer message indicates that the mapping set for the path loss reference RS identifier set is to be updated, and wherein the MAC layer message identifies the PUSCH power control identifier set.

4. The method of claim 1, further comprising: Information configuring a maximum number of path loss reference RS identifiers that can be configured in the MAC layer message is received. 5 . The method of claim 4 , wherein the information configuring the maximum number of path loss reference RS identifiers configurable in the MAC layer message is received using radio resource control signaling. The method of claim 1 , wherein the set of SRS resource set identifiers is associated with a semi-persistent SRS resource set or an aperiodic SRS resource set.

7. The method of claim 1, wherein the MAC layer message explicitly identifies the path loss reference RS identifier set and the SRS resource set identifier set.

8. A method as claimed in claim 1, wherein the path loss reference RS identifier set is included in a plurality of path loss reference RS identifiers, wherein the MAC layer message indicates that the mapping set for the path loss reference RS identifier set is to be updated, and wherein the MAC layer message identifies the SRS resource set identifier set.

9. A wireless communication method performed by a base station, comprising: Transmitting a medium access control (MAC) layer message indicating a set of mappings between a set of path loss reference signal (RS) identifiers and one of: A set of Physical Uplink Shared Channel (PUSCH) identifiers, or a set of sounding reference signal (SRS) identifiers; transmitting downlink control information (DCI) activating a mapping in the mapping set; as well as The path loss RS for path loss measurement is transmitted according to the activated mapping.

10. The method of claim 9, wherein the MAC layer message explicitly identifies the path loss reference RS identifier set and the PUSCH power control identifier set.

11. A method as claimed in claim 9, wherein the path loss reference RS identifier set is included in a plurality of path loss reference RS identifiers, wherein the MAC layer message indicates that the mapping set for the path loss reference RS identifier set is to be updated, and wherein the MAC layer message identifies the PUSCH power control identifier set.

12. The method of claim 9, further comprising: The information configuring the maximum number of path loss reference RS identifiers that can be configured in the MAC layer message is transmitted. 13 . The method of claim 12 , wherein the information configuring the maximum number of path loss reference RS identifiers configurable in the MAC layer message is transmitted using radio resource control signaling.

14. The method of claim 9, wherein the MAC layer message indicates the mapping set based at least in part on an order or sequence of the path loss reference RS identifier sets in the MAC layer message. 15 . The method of claim 9 , wherein the set of SRS resource set identifiers is associated with a semi-persistent SRS resource set or an aperiodic SRS resource set.

16. The method of claim 9, wherein the MAC layer message explicitly identifies the path loss reference RS identifier set and the SRS resource set identifier set.

17. A method as claimed in claim 9, wherein the path loss reference RS identifier set is included in a plurality of path loss reference RS identifiers, wherein the MAC layer message indicates that the mapping set for the path loss reference RS identifier set is to be updated, and wherein the MAC layer message identifies the SRS resource set identifier set.

18. A user equipment (UE) for wireless communication, comprising: Memory; as well as one or more processors operatively coupled to the memory, the memory and the one or more processors being configured to: A medium access control (MAC) layer message is received, the MAC layer message indicating a set of mappings between a set of path loss reference signal (RS) identifiers and one of: A set of Physical Uplink Shared Channel (PUSCH) identifiers, or a set of sounding reference signal (SRS) identifiers; receiving downlink control information (DCI) activating a mapping in the set of mappings; as well as Path loss measurements are performed using the path loss RS identified by the activated mapping.

19. The UE of claim 18, wherein the MAC layer message explicitly identifies the path loss reference RS identifier set and the PUSCH power control identifier set.

20. The UE of claim 18, wherein the path loss reference RS identifier set is included in a plurality of path loss reference RS identifiers, wherein the MAC layer message indicates that the mapping set for the path loss reference RS identifier set is to be updated, and wherein the MAC layer message identifies the PUSCH power control identifier set.

21. The UE of claim 18, wherein the one or more processors are further configured to: Information configuring a maximum number of path loss reference RS identifiers that can be configured in the MAC layer message is received.

22. The UE of claim 21, wherein the information configuring the maximum number of path loss reference RS identifiers configurable in the MAC layer message is received using radio resource control signaling.

23. The UE of claim 18, wherein the set of SRS resource set identifiers is associated with a semi-persistent SRS resource set or an aperiodic SRS resource set.

24. The UE of claim 18, wherein the MAC layer message explicitly identifies the path loss reference RS identifier set and the SRS resource set identifier set.

25. The UE of claim 18, wherein the path loss reference RS identifier set is included in a plurality of path loss reference RS identifiers, wherein the MAC layer message indicates that the mapping set for the path loss reference RS identifier set is to be updated, and wherein the MAC layer message identifies the SRS resource set identifier set.

26. A base station for wireless communication, comprising: Memory; as well as one or more processors operatively coupled to the memory, the memory and the one or more processors being configured to: Transmitting a medium access control (MAC) layer message indicating a set of mappings between a set of path loss reference signal (RS) identifiers and one of: A set of Physical Uplink Shared Channel (PUSCH) identifiers, or a set of sounding reference signal (SRS) identifiers; transmitting downlink control information (DCI) activating a mapping in the mapping set; as well as The path loss RS for path loss measurement is transmitted according to the activated mapping.

27. The base station of claim 26, wherein the MAC layer message explicitly identifies the path loss reference RS identifier set and the PUSCH power control identifier set.

28. A base station as claimed in claim 26, wherein the path loss reference RS identifier set is included in a plurality of path loss reference RS identifiers, wherein the MAC layer message indicates that the mapping set for the path loss reference RS identifier set is to be updated, and wherein the MAC layer message identifies the PUSCH power control identifier set.

29. The base station of claim 26, wherein the one or more processors are further configured to: The information configuring the maximum number of path loss reference RS identifiers that can be configured in the MAC layer message is transmitted.

30. The base station of claim 29, wherein the information configuring the maximum number of path loss reference RS identifiers configurable in the MAC layer message is transmitted using radio resource control signaling.

Images