Downlink control information alignment for multi-panel uplink MIMO transmission

Abstract

Aspects of the present disclosure generally relate to wireless communications. In some aspects, a user device may: determine a first configuration for a first sounding reference signal (SRS) set and a second configuration for a second SRS set, the first SRS set to be transmitted using a first set of antennas of the UE, and the second SRS set to be transmitted using a second set of antennas of the UE; determine the size of a DCI field to be included in an uplink downlink control information (DCI) communication for scheduling a physical uplink shared channel (PUSCH) transmission, the DCI field indicating a selected SRS set; receive an uplink DCI communication for scheduling a PUSCH transmission; and identify the selected SRS set based at least in part on the size of the determined DCI field and the information carried in the DCI field. Many other aspects are also provided.

Description

Technical Field

[0001] Aspects of the present disclosure relate generally to wireless communications and to techniques and apparatus for downlink control information (DCI) alignment for multi-panel uplink multiple-input multiple-output (MIMO) transmissions. Background Art

[0002] Wireless communication systems are widely deployed to provide a variety of telecommunication services, such as telephony, video, data, messaging, and broadcasting. Typical wireless communication systems may employ multiple access technologies that can support communication with multiple users by sharing available system resources (e.g., bandwidth, transmission 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).

[0003] A wireless communication network may include multiple base stations (BS) that may support communication of multiple user equipments (UEs). User equipments (UEs) may communicate with base stations (BSs) via downlinks and uplinks. A downlink (or forward link) refers to a communication link from a BS to a UE, and an uplink (or reverse link) refers to a communication link from a UE to a 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, etc.

[0004] The above-mentioned multiple access technologies have been adopted in various telecommunication standards to provide a common protocol that enables different user equipment to communicate at municipal, national, regional 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 better integrating with orthogonal frequency division multiplexing (OFDM) (CP-OFDM) with cyclic prefix (CP) on the downlink (DL), CP-OFDM and / or SC-FDM (e.g., also known as discrete Fourier transform spread OFDM (DFT-s-OFDM)) on the uplink (UL), and other open standards that support beamforming, multiple input multiple output (MIMO) antenna technology and carrier aggregation. However, as the demand for mobile broadband access continues to increase, further improvements in LTE and NR technologies are needed. Preferably, these improvements should be applicable to other multiple access technologies and telecommunication standards that adopt these technologies. Summary of the invention

[0005] In some aspects, a method of wireless communication performed by a UE may include: determining a first configuration for a first sounding reference signal (SRS) set and a second configuration for a second SRS set, the first SRS set to be sent using a first group of antennas of the UE, and the second SRS set to be sent using a second group of antennas of the UE; determining a size of a DCI field to be included in an uplink downlink control information (DCI) communication for scheduling a physical uplink shared channel (PUSCH) transmission based at least in part on the first configuration and the second configuration, the DCI field indicating a selected SRS set; receiving an uplink DCI communication for scheduling a PUSCH transmission; and identifying a selected SRS set based at least in part on the determined size of the DCI field and information carried in the DCI field, the selected SRS set being the first SRS set or the second SRS set.

[0006] In some aspects, a UE for wireless communication may include a memory and one or more processors operably coupled to the memory. The memory and the one or more processors may be configured to: determine a first configuration for a first SRS set and a second configuration for a second SRS set, the first SRS set to be transmitted using a first set of antennas of the UE, and the second SRS set to be transmitted using a second set of antennas of the UE; determine a size of a DCI field to be included in an uplink DCI communication for scheduling a PUSCH transmission based at least in part on the first configuration and the second configuration, the DCI field indicating a selected SRS set; receive an uplink DCI communication for scheduling a PUSCH transmission; and identify the selected SRS set based at least in part on the size of the determined DCI field and the information carried in the DCI field, the selected SRS set being the first SRS set or the second SRS set.

[0007] 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: determine a first configuration for a first SRS set and a second configuration for a second SRS set, the first SRS set to be transmitted using a first set of antennas of the UE, and the second SRS set to be transmitted using a second set of antennas of the UE; determine a size of a DCI field to be included in an uplink DCI communication for scheduling a PUSCH transmission based at least in part on the first configuration and the second configuration, the DCI field indicating the selected SRS set; receive an uplink DCI communication for scheduling a PUSCH transmission; and identify the selected SRS set based at least in part on the size of the determined DCI field and the information carried in the DCI field, the selected SRS set being the first SRS set or the second SRS set.

[0008] In some aspects, an apparatus for wireless communication may include: a component for determining a first configuration for a first SRS set and a second configuration for a second SRS set, the first SRS set to be transmitted using a first group of antennas of the apparatus, and the second SRS set to be transmitted using a second group of antennas of the apparatus; a component for determining a size of a DCI field to be included in an uplink DCI communication for scheduling a PUSCH transmission based at least in part on the first configuration and the second configuration, the DCI field indicating a selected SRS set; a component for receiving an uplink DCI communication for scheduling a PUSCH transmission; and a component for identifying a selected SRS set based at least in part on the determined size of the DCI field and information carried in the DCI field, the selected SRS set being the first SRS set or the second SRS set.

[0009] Aspects generally include methods, apparatus, systems, computer program products, non-transitory computer-readable media, user equipment, base stations, wireless communication devices, and / or processing systems as generally described herein with reference to and as illustrated by the accompanying drawings, appendices, and description.

[0010] The features and technical advantages of the examples according to the present disclosure have been outlined quite broadly above so that the following specific embodiments may be better understood. Additional features and advantages will be described below. The disclosed concepts and specific examples may be easily used as the basis for modifying or designing other structures for achieving the same purpose as the present disclosure. Such equivalent constructions do not depart from the scope of the appended claims. The characteristics of the concepts disclosed herein, their organization and methods of operation, and associated advantages will be better understood from the following description when considered in conjunction with the accompanying drawings. Each of the accompanying drawings is provided for illustration and description purposes, and not as a definition of the limitations of the claims. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] In order that the above-mentioned features of the present disclosure may be understood in detail, a more specific description of the above briefly summarized aspects may be provided by reference to various aspects of which some are shown in the accompanying drawings. However, it should be noted that the accompanying drawings only show certain typical aspects of the present disclosure and therefore should not be considered as limiting the scope thereof, as the description may allow for other equally effective aspects. The same reference numerals in different drawings may represent the same or similar elements.

[0012] Figure 1 is a block diagram conceptually illustrating an example of a wireless communication network in accordance with aspects of the present disclosure.

[0013] Figure 2 is a block diagram conceptually illustrating an example of a base station communicating with a UE in a wireless communication network according to aspects of the present disclosure.

[0014] Figure 3A-3C is a diagram illustrating examples associated with DCI alignment for multi-panel uplink MIMO transmissions in accordance with aspects of the present disclosure.

[0015] Figure 4 is a schematic diagram illustrating an example process performed, for example, by a user device, according to aspects of the present disclosure. DETAILED DESCRIPTION

[0016] Aspects of the present disclosure are described more fully below with reference to the accompanying drawings. However, the present disclosure can be embodied in many different forms, and should not be construed as being limited to any specific structure or function presented throughout the present disclosure. Rather, these aspects are provided so that the present disclosure will be thorough and complete, and the scope of the present disclosure will be fully transmitted to those skilled in the art. Based on the teachings of this article, it should be understood by those skilled in the art that the scope of the present disclosure is intended to cover any aspect of the disclosure disclosed herein, whether it is implemented independently of any other aspect of the present disclosure or implemented in combination with any other aspect of the present disclosure. 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 a device or method that is practiced using other structures, functionality, or structures and functionality in addition to or different from the various aspects of the disclosure set forth herein. It should be understood that any aspect of the disclosure disclosed herein can be embodied by one or more elements of the claims.

[0017] Several aspects of telecommunication systems will now be presented with reference to various devices and techniques. These devices and techniques will be 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.

[0018] It should be noted that although various aspects may be described herein using terminology typically associated with 3G and / or 4G wireless technologies, aspects of the present disclosure may be applied to communication systems based on other generations, such as 5G and higher, including NR technology.

[0019] Figure 1 1 is a schematic diagram showing 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 a plurality of BSs 110 (shown as BSs 110a, BSs 110b, BSs 110c, and BSs 110d) and other network entities. A BS is an entity that communicates with a 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 receive point (TRP), etc. Each BS may provide communication coverage for a particular geographic area. In 3GPP, the term "cell" may refer to a coverage area of ​​a BS and / or a BS subsystem serving this coverage area, depending on the context in which the term is used.

[0020] 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., a radius of several kilometers) and may allow unrestricted access to UEs with service subscriptions. A pico cell may cover a relatively small geographic area and may allow unrestricted access to UEs with service subscriptions. A femto cell may cover a relatively small geographic area (e.g., a home) and may allow restricted access to 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 1 In the example shown in , 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.

[0021] In some aspects, the cell may not necessarily be fixed, and the geographic area of ​​the cell 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 similar interfaces using any suitable transport network.

[0022] 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 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 FIG. 1 , a relay station 110 d may communicate with a macro BS 110 a and a UE 120 d to facilitate communication between the BS 110 a and the UE 120 d. A relay station may also be referred to as a relay BS, a relay base station, a relay, or the like.

[0023] The wireless network 100 may be a heterogeneous network including different types of BSs, for example, a macro BS, a pico BS, a femto BS, a relay BS, etc. These different types of BSs may have different transmission power levels, different coverage areas, and different effects on interference in the wireless network 100. For example, a macro BS may have a high transmission power level (e.g., 5 to 40 watts), while a pico BS, a femto BS, and a relay BS may have a lower transmission power level (e.g., 0.1 to 2 watts).

[0024] A network controller 130 may be coupled to a set of BSs and may provide coordination and control for these BSs. The network controller 130 may communicate with the BSs via a backhaul. The BSs may also communicate with each other, for example, directly or indirectly via a wireless or wired backhaul.

[0025] UE 120 (e.g., 120a, 120b, 120c) can be dispersed throughout the wireless network 100, and each UE can be fixed or mobile. UE can also be referred to as an access terminal, terminal, mobile station, subscriber unit, station, etc. UE can be a cellular phone (e.g., a smart phone), 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 computer, a camera, a gaming device, a netbook, a smartbook, an ultrabook, a medical device or equipment, a biosensor / device, a wearable device (smart watch, smart clothing, smart glasses, smart wristband, smart jewelry (e.g., smart ring, smart bracelet)), an entertainment device (e.g., a music or video device, or a satellite radio), a vehicle-mounted 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.

[0026] Some UEs may be considered as machine type communication (MTC) or evolved or enhanced machine type communication (eMTC) UEs. MTC and eMTC UEs include, for example, robots, drones, remote devices, sensors, meters, monitors, positioning tags, etc., which may communicate with a base station, another device (e.g., a remote device), or some other entity. For example, a wireless node may provide connectivity to a network or to a network (e.g., a wide area network such as the Internet or a cellular network) via a wired or wireless communication link. Some UEs may be considered as Internet of Things (IoT) devices, and / or may be implemented as NB-IoT (narrowband Internet of Things) devices. Some UEs may be considered as 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.

[0027] Generally, any number of wireless networks can be deployed in a given geographic area. Each wireless network can support a specific radio access technology (RAT) and can operate on one or more frequencies. RAT can also be referred to as radio technology, air interface, etc. Frequency can also be referred to as carrier, frequency channel, etc. Each frequency can 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 can be deployed.

[0028] 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 for mutual communication) using one or more sidelink channels. For example, UE 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 case, UE 120 may perform scheduling operations, resource selection operations, and / or other operations described elsewhere herein as being performed by base station 110.

[0029] As indicated above, provide Figure 1 As an example. Other examples can be related to Figure 1 Different than described.

[0030] Figure 2 A block diagram shows a design 200 of a base station 110 and a UE 120, which may be Figure 1 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.

[0031] At the base station 110, the transmit processor 220 may receive data for one or more UEs from the 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. The transmit processor 220 may also process system information (e.g., for semi-static resource partitioning information (SRPI), etc.) and control information (e.g., CQI requests, grants, upper layer signaling, etc.), and provide overhead symbols and control symbols. The transmit processor 220 may also generate reference symbols for reference signals (e.g., cell-specific reference signals (CRS)) and synchronization signals (e.g., primary synchronization signals (PSS) and secondary synchronization signals (SSS)). The 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, if applicable, and may provide T output symbol streams to T modulators (MOD) 232a to 232t. Each modulator 232 may process a corresponding 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 up-convert) the output sample stream to obtain a downlink signal. The T downlink signals from modulators 232a to 232t may be transmitted via T antennas 234a to 234t, respectively. According to various aspects described in more detail below, positioning coding may be used to generate synchronization signals to transmit additional information.

[0032] At UE 120, antennas 252a to 252r may receive downlink signals from base station 110 and / or other base stations and may provide received signals to demodulators (DEMOD) 254a to 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 to 254r, perform MIMO detection on the received symbols (if 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.

[0033] On the uplink, at the UE 120, a transmit processor 264 may receive and process data from a data source 262 and control information from a controller / processor 280 (e.g., for reports including RSRP, RSSI, RSRQ, CQI, etc.). 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 transmitted by the UE 120. The receive processor 238 may provide decoded data to a data sink 239 and decoded control information to the controller / processor 240. The base station 110 may include a communication unit 244 and communicate with the network controller 130 via the communication unit 244. The network controller 130 may include a communication unit 294, a controller / processor 290, and a memory 292.

[0034] The controller / processor 240 of the base station 110, the controller / processor 280 of the UE 120, and / or Figure 2Any other components of the controller / processor 240 of the base station 110, the controller / processor 280 of the UE 120, and / or Figure 2 Any other component of the can perform or direct e.g. Figure 4 400 and / or other processes 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 4 The scheduler 246 may schedule UEs for data transmission on the downlink and / or uplink.

[0035] In some aspects, UE 120 may include: components for determining a first configuration for a first SRS set and a second configuration for a second SRS set, the first SRS set to be transmitted using a first set of antennas of UE 120, and the second SRS set to be transmitted using a second set of antennas of UE 120; components for determining a size of a DCI field to be included in an uplink DCI communication scheduling a PUSCH transmission based at least in part on the first configuration and the second configuration, the DCI field indicating the selected SRS set; components for receiving an uplink DCI communication scheduling a PUSCH transmission; components for identifying the selected SRS set based at least in part on the determined size of the DCI field and information carried in the DCI field, the selected SRS set being the first SRS set or the second SRS set; and so on. In some aspects, such components may include combining Figure 2 One or more components of UE 120 are depicted, such as controller / processor 280, transmit processor 264, TX MIMO processor 266, MOD 254, antenna 252, DEMOD 254, MIMO detector 256, receive processor 258, etc.

[0036] As indicated above, provide Figure 2 As an example. Other examples can be related to Figure 2 Different than described.

[0037] In some cases, a UE (e.g., UE 120) may have heterogeneous two-group antennas (sometimes also referred to as panels), meaning that the UE may include multiple groups of antennas with different numbers of antenna ports. For example, a UE with heterogeneous two-group antennas may include a first group of antennas with four antenna ports and a second group of antennas with two antenna ports. Such a UE may help, for example, reduce the cost of the UE (e.g., because increasing the number of antenna ports increases the cost of the UE), reduce the area requirements of the UE antenna group (e.g., so that space can be saved for use by another component of the UE, such as a camera array), etc. In the case of a UE with multiple groups of antennas, a given uplink downlink control information (DCI) communication may schedule any group of antennas for uplink transmission (e.g., uplink MIMO transmission).

[0038] However, in the case where the UE has a heterogeneous antenna group (i.e., a panel with a different number of antenna ports), the size of one or more fields of the uplink DCI communication may be different in length (i.e., using a different number of bits), depending on which group of antennas the uplink DCI communication is scheduling. For example, the UE may have a first group of antennas including four antenna ports and a second group of antennas including two antenna ports. Here, the uplink DCI communication that schedules uplink transmissions using the first group of antennas may include a field indicating a selected sounding reference signal (SRS) set as a set of SRSs to be sent using the first group of antennas, and the size of the DCI field may be, for example, four bits. Conversely, the uplink DCI communication that schedules uplink transmissions using the second group of antennas may include a field indicating a selected set of SRSs as a set of SRSs to be sent using the second group of antennas, and the size of the DCI field may be, for example, two bits. It is possible that the UE may perform blind detection on DCIs of various lengths to determine which group of antennas the uplink DCI is scheduling. However, such techniques increase complexity and / or power consumption at the UE and are therefore undesirable.

[0039] Some aspects described herein provide techniques and apparatus for DCI alignment of multi-panel uplink MIMO transmissions. In some aspects, a UE may determine a configuration for a first SRS set and a second SRS set, wherein the first SRS set will be transmitted using a first group of antennas, and the second SRS set will be transmitted using a second group of antennas. In some aspects, the UE may determine the size of a DCI field to be included in an uplink DCI communication for scheduling uplink transmissions based at least in part on the first configuration and the second configuration, wherein the DCI field is used to indicate a selected SRS set. Here, the UE may receive an uplink DCI communication for scheduling uplink transmissions, and may identify the selected SRS set based at least in part on the size of the determined DCI field and the information carried in the DCI field. Because the size of the DCI field is determined by the UE at least in part based on the first configuration and the second configuration, potential DCI field size mismatches are avoided, thereby eliminating the need for the UE to perform blind decoding associated with identifying the selected SRS set. Additional details are provided below.

[0040] Figure 3A-3C is a schematic diagram illustrating an example associated with DCI alignment for multi-panel uplink MIMO transmissions according to aspects of the present disclosure. Figure 3A In the illustrated example, a UE (eg, UE 120) includes a first set of antennas and a second set of antennas, either set of antennas being scheduled for uplink transmissions (eg, PUSCH transmissions).

[0041] In some aspects, the UE may be configured for non-codebook based PUSCH transmission, and the use of the SRS set may be configured as non-codebook based. Such a situation is referred to herein as a non-codebook based situation. Alternatively, in some aspects, the UE may be configured for codebook based PUSCH transmission, and the use of the SRS set may be configured as codebook based. Such a situation is referred to herein as a codebook based situation. Examples associated with non-codebook based and codebook based situations are described below.

[0042] As shown by reference numeral 305, the UE may determine a first configuration for a first SRS set and a second configuration for a second SRS set. In some aspects, the first SRS set is a set of SRS to be transmitted using a first set of antennas of the UE, and the second SRS set is a set of SRS to be transmitted using a second set of antennas of the UE.

[0043] In some aspects, in a non-codebook based scenario, the first configuration may include information identifying the number of SRSs in the first SRS set (Nsrs1) and the maximum number of layers associated with the first SRS set (Lmax1). Similarly, the second configuration may include information identifying the number of SRSs in the second SRS set (Nsrs2) and the maximum number of layers associated with the second SRS set (Lmax2).

[0044] In some aspects, in a codebook-based scenario, the first configuration may include information identifying the number of ports of the first SRS set, the value of the maximum rank parameter associated with the first SRS set (maxRank), and the setting of the codebook subset parameter associated with the first SRS set (e.g., indicating whether the codebook subset parameter is set to fullyAndPartialAndNonCoherent, PartialAndNonCoherent, or nonCoherent). Similarly, the second configuration may include information identifying the number of ports of the second SRS set, the value of the maximum rank parameter associated with the second SRS set, and the setting of the codebook subset parameter associated with the second SRS set.

[0045] In some aspects, the first configuration and / or the second configuration may be based at least in part on UE capabilities. For example, in a non-codebook based scenario, the first configuration and / or the second configuration may be based at least in part on UE capabilities associated with the number of SRS per group of antennas, UE capabilities associated with the maximum number of SRS resources that can be configured to the UE for simultaneous transmission in the same symbol, UE capabilities associated with the maximum number of SRS resources, etc. In some aspects, the UE may provide one or more reports associated with such UE capabilities. Here, a base station (e.g., base station 110) may receive one or more reports, may determine a first configuration and / or a second configuration based at least in part on one or more reported UE capabilities, and may signal the UE with the first configuration and / or the second configuration (e.g., via radio resource control (RRC) signaling).

[0046] In some aspects, in a non-codebook based scenario, the first SRS set may have up to four SRSs and the second SRS set may have up to four SRSs (e.g., when the UE has two groups of antennas, each group of antennas includes four antenna ports). Alternatively, in a non-codebook based scenario, in some aspects (e.g., when the UE has a first group of antennas including four antenna ports and a second group of antennas including two antenna ports), the first SRS set may have up to four SRSs and the second SRS set may have up to two SRSs.

[0047] As another example, in a codebook-based scenario, the first configuration and / or the second configuration may be based at least in part on UE capabilities associated with the number of ports per group of antennas of the UE, UE capabilities associated with codebook subset parameters, etc. In some aspects, the UE may provide one or more reports associated with such UE capabilities. Here, the base station may receive the one or more reports, may determine the first configuration and / or the second configuration based at least in part on the one or more reported UE capabilities, and may signal the first configuration and / or the second configuration to the UE (e.g., via RRC signaling).

[0048] In some aspects, in a codebook-based scenario, the first SRS set may have up to four ports and the second SRS set may have up to four ports (e.g., when the UE has two antenna groups, each antenna group includes four antenna ports). Alternatively, in a non-codebook-based scenario, in some aspects (e.g., when the UE has a first antenna group including four antenna ports and a second antenna group including two antenna ports), the first SRS set may have up to four ports and the second SRS set may have up to two ports.

[0049] As shown in reference numerals 310 and 315, respectively, the UE may transmit a first SRS set and may transmit a second SRS set. In some aspects, the UE may transmit the first SRS set using a first set of antennas and based at least in part on a first configuration. Similarly, the UE may transmit the second SRS set using a second set of antennas and based at least in part on a second configuration.

[0050] As indicated by reference numeral 320, the UE may determine a size of a DCI field associated with indicating the selected SRS set to be included in an uplink DCI communication that schedules an uplink transmission (e.g., a PUSCH transmission). In some aspects, the UE may determine the size of the DCI field based at least in part on the first configuration and the second configuration.

[0051] For example, in a non-codebook based scenario, a first configuration may configure a first SRS set to include four SRSs (Nsrs1=1) and have a maximum of four layers (Lmax1=4), while a second configuration may configure a second SRS to include two SRSs (Nsrs2=2) and have a maximum of two layers (Lmax2=2). Here, the UE may determine (e.g., based at least in part on a table identifying the size of an SRS resource indicator (SRI) field for non-codebook based PUSCH transmissions with a maximum of four layers) that the size of the SRI field associated with the first configuration is four bits. The UE may also determine (e.g., based at least in part on a table identifying the size of an SRI field for non-codebook based PUSCH transmissions with a maximum of two layers) that the size of the SRI field associated with the second configuration is two bits. Here, the UE may determine the size of a DCI field associated with indicating the selected SRS to be four bits (e.g., the larger of the two SRI field sizes). In some aspects, the UE may identify the selected SRS set based at least in part on the determined size of the DCI field, as described below.

[0052] Additionally or alternatively, in a non-codebook based scenario, the size of the DCI may be determined by evaluating the following formula:

[0053]

[0054] As another example, in a codebook-based scenario, a first configuration may configure a first SRS set in which a transform precoder is disabled and includes four ports, a maximum rank parameter is 4 (maxRank=4) and a codebook subset parameter is set to "fullyAndPartialAndNoncoherent", while a second configuration may configure a second SRS in which a transform precoder is disabled and includes two ports, a maximum rank parameter is 2 (maxRank=2) and a codebook subset parameter is set to "fullyAndPartialAndNoncoherent". Here, the UE may determine (e.g., based at least in part on a table identifying a size of a transmit precoder matrix indicator (TPMI) / transmit rank indicator (TRI) field for a codebook-based PUSCH transmission having four antenna ports and a maxRank of 2, 3, or 4) that the size of the TPMI field associated with the first configuration is six bits. The UE may also determine (e.g., based at least in part on a table identifying a size of a TPMI / TRI field for a codebook-based PUSCH transmission with two antenna ports and a maxRank of 2) that the size of the TPMI field associated with the second configuration is four bits. Here, the UE may determine the size of the DCI field associated with indicating the selected SRS to be six bits (e.g., the larger of the two TPMI field sizes). In some aspects, the UE may identify the selected SRS set based at least in part on the determined size of the DCI field, as described below.

[0055] As shown in reference numeral 325, the UE may receive an uplink DCI communication that schedules a PUSCH transmission. For example, a base station may receive a first SRS set and a second SRS set sent by the UE. The base station may measure the first SRS set and the second SRS set, and based at least in part on these measurements, may identify an SRS set that uses a set of antennas suitable for transmission of an uplink transmission. The base station may then provide an uplink DCI communication indicating the selected SRS and schedule the uplink transmission. In some aspects, the base station may determine the size of the DCI field associated with the indicated selected SRS set in a manner similar to that of the UE as described above. In some aspects, the base station may include one or more padding bits in the DCI field associated with the indicated selected SRS set, as described below. Accordingly, the UE may receive an uplink DCI communication from the base station.

[0056] As indicated by reference numeral 325, the UE may identify the selected SRS set based at least in part on the determined size of the DCI field and information carried in the DCI field, the selected SRS set being the first SRS set or the second SRS set.

[0057] For example, in the above example based on the non-codebook scenario, the UE determines that the size of the DCI field is four bits (e.g., based at least in part on determining that the size of the SRI field associated with the first configuration is four bits and the size of the SRI field associated with the second configuration is two bits). In this example, the UE may receive an uplink DCI communication and process a DCI field associated with an indication of a selected SRS set to determine whether the DCI field includes two padding bits (e.g., whether the two most significant bits (MSBs) of the DCI field carrying the SRI include a specific sequence, such as 00). Here, when the DCI field includes two padding bits, the UE may identify the selected SRS set as the second SRS set (e.g., because only two of the four bits are required to convey the indication associated with the second SRS set). Conversely, when the DCI field does not include any padding bits, the UE may identify the selected SRS set as the first SRS set (e.g., because four bits are required to convey the indication associated with the first SRS set). Thus, in some aspects, in a non-codebook based scenario, the DCI field may include an SRI field that indicates the precoder used for uplink transmission and the number of layers associated with the uplink transmission, and the length of the SRI field may be used as an indicator of the selected SRS set. In this way, the DCI field may include one or more padding bits associated with avoiding DCI size mismatches in a non-codebook based scenario.

[0058] Figure 3B is a table showing examples of the number of padding bits associated with indicating a selected SRS set that may be included in a DCI field in various non-codebook based scenarios when the UE has a first set of four antennas and a second set of two antennas.

[0059] As another example, in the above example of a codebook-based scenario, the UE determines that the size of the DCI field is six bits (e.g., based at least in part on determining that the size of the TPMI / TRI field associated with the first configuration is six bits and the size of the TPMI / TRI field associated with the second configuration is four bits). In this example, the UE may receive an uplink DCI communication and process a DCI field associated with an indication of a selected SRS set to determine whether the DCI field includes two padding bits. Here, when the DCI field includes two padding bits, the UE may identify the selected SRS set as the second SRS set (e.g., because only four of the six bits are required to convey the indication associated with the second SRS set). Conversely, when the DCI field does not include any padding bits, the UE may identify the selected SRS set as the first SRS set (e.g., because six bits are required to convey the indication associated with the first SRS set). Thus, in some aspects, in a codebook-based scenario, the DCI field may include a TPMI / TRI field that indicates the precoder used for uplink transmission and the number of layers associated with the uplink transmission, and the length of the TPMI / TRI field may be used as an indicator of the selected SRS set. In this way, the DCI field may include one or more padding bits associated with avoiding DCI size mismatches. In this way, the DCI field may include one or more padding bits associated with avoiding DCI size mismatches in a codebook-based scenario.

[0060] Figure 3C is a table showing examples of the number of padding bits associated with indicating a selected SRS set that may be included in a DCI field in various codebook-based scenarios when the UE has a first set of four antennas and a second set of two antennas.

[0061] return Figure 3A In some aspects, as shown by reference numeral 330, the UE may send an uplink transmission based at least in part on the identified selected SRS set. For example, the UE may identify the selected SRS set based at least in part on the uplink DCI communication, and accordingly may send an uplink transmission based at least in part on the selected SRS set. As a specific example, when the first SRS set is the selected SRS set, the UE may use a first group of antennas to send the uplink transmission, and when the second SRS set is the selected SRS set, the UE may use a second group of antennas to send the uplink transmission.

[0062] As shown above, providing Figure 3A-3C As an example. Other examples can be related to Figure 3A-3C Different than described.

[0063] Figure 4 is a diagram illustrating an example process 400, for example, performed by a UE, in accordance with aspects of the present disclosure. Example process 400 is an example of a UE (eg, UE 120, etc.) performing operations associated with DCI alignment for multi-panel uplink MIMO transmissions.

[0064] like Figure 4 As shown in , in some aspects, process 400 may include determining a first configuration for a first SRS set and a second configuration for a second SRS set, the first SRS set to be transmitted using a first set of antennas of the UE, and the second SRS set to be transmitted using a second set of antennas of the UE (block 410). For example, the UE (e.g., using receive processor 258, transmit processor 264, controller / processor 280, memory 282, etc.) may determine a first configuration for the first SRS set and a second configuration for the second SRS set, as described above. In some aspects, the first SRS set is to be transmitted using a first set of antennas of the UE, and the second SRS set is to be transmitted using a second set of antennas of the UE.

[0065] like Figure 4 As further shown in FIG. 4 , in some aspects, process 400 may include determining, based at least in part on the first configuration and the second configuration, a size of a DCI field to be included in an uplink DCI communication scheduling a PUSCH transmission, the DCI field indicating the selected SRS set (block 420). For example, the UE (e.g., using receive processor 258, transmit processor 264, controller / processor 280, memory 282, etc.) may determine, based at least in part on the first configuration and the second configuration, a size of a DCI field to be included in an uplink DCI communication scheduling a PUSCH transmission, as described above. In some aspects, the DCI field is used to indicate the selected SRS set.

[0066] like Figure 4 As further shown in FIG. 4 , in some aspects, process 400 may include receiving an uplink DCI communication scheduling a PUSCH transmission (block 430). For example, the UE (e.g., using receive processor 258, controller / processor 280, memory 282, etc.) may receive an uplink DCI communication scheduling a PUSCH transmission, as described above.

[0067] like Figure 4As further shown in , in some aspects, process 400 may include identifying the selected SRS set based at least in part on the determined size of the DCI field and the information carried in the DCI field, the selected SRS set being the first SRS set or the second SRS set (block 440). For example, the UE (e.g., using receive processor 258, transmit processor 264, controller / processor 280, memory 282, etc.) may identify the selected SRS set based at least in part on the determined size of the DCI field and the information carried in the DCI field, as described above. In some aspects, the selected SRS set is the first SRS set or the second SRS set.

[0068] Process 400 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.

[0069] In a first aspect, process 400 includes sending a PUSCH transmission based at least in part on an identified selected SRS set, wherein the PUSCH transmission is sent using a first set of antennas when a first SRS set is the selected SRS set, and wherein the PUSCH transmission is sent using a second set of antennas when a second SRS set is the selected SRS set.

[0070] In a second aspect, either alone or in combination with the first aspect, process 400 includes transmitting a first set of SRS using a first set of antennas and based at least in part on a first configuration; and transmitting a second set of SRS using a second set of antennas and based at least in part on a second configuration.

[0071] In a third aspect, alone or in combination with one or more of the first and second aspects, the DCI field includes one or more padding bits associated with avoiding DCI size mismatch.

[0072] In a fourth aspect, alone or in combination with one or more of the first to third aspects, the UE is configured for non-codebook based PUSCH transmission, and usage of the first SRS set and the second SRS set is configured as non-codebook based.

[0073] In a fifth aspect, alone or in combination with one or more of the first to fourth aspects, the first SRS set has up to four SRSs, and the second SRS set has up to four SRSs.

[0074] In a sixth aspect, alone or in combination with one or more of the first to fifth aspects, the first SRS set has up to four SRSs, and the second SRS set has up to two SRSs.

[0075] In a seventh aspect, either alone or in combination with one or more of the first to sixth aspects, process 400 includes providing a report including UE capability information associated with the number of SRSs for each group of antennas of the UE, wherein the first configuration and the second configuration are based at least in part on the UE capability information associated with the number of SRSs for each group of antennas.

[0076] In the eighth aspect, alone or in combination with one or more of the first to seventh aspects, the first configuration includes information identifying the number of SRSs in a first SRS set and the maximum number of layers associated with the first SRS set, and the second configuration includes information identifying the number of SRSs in a second SRS set and the maximum number of layers associated with the second SRS set.

[0077] In a ninth aspect, alone or in combination with one or more of the first to eighth aspects, process 400 includes providing a report including UE capability information associated with a maximum number of SRS resources that can be configured to the UE for simultaneous transmission in the same symbol and a maximum number of SRS resources, wherein the first configuration and the second configuration are based at least in part on the UE capability information.

[0078] In a tenth aspect, alone or in combination with one or more of the first to ninth aspects, the DCI field includes an SRS resource indicator indicating a precoder for PUSCH transmission and a number of layers associated with the PUSCH transmission.

[0079] In an eleventh aspect, alone or in combination with one or more of the first to tenth aspects, the UE is configured for codebook-based PUSCH transmission, and usage of the first SRS set and the second SRS set is configured to be codebook-based.

[0080] In a twelfth aspect, alone or in combination with one or more of the first to eleventh aspects, the first SRS set has up to four ports and the second SRS set has up to four ports.

[0081] In a thirteenth aspect, alone or in combination with one or more of the first to twelfth aspects, the first SRS set has up to four ports and the second SRS set has up to two ports.

[0082] In a fourteenth aspect, either alone or in combination with one or more of the first to thirteenth aspects, process 400 includes providing a report including UE capability information associated with a number of ports for each group of antennas of the UE, wherein the first configuration and the second configuration are based at least in part on the UE capability information associated with the number of ports for each group of antennas.

[0083] In the fifteenth aspect, alone or in combination with one or more of the first to fourteenth aspects, the first configuration includes information identifying the number of ports of the first SRS set, the value of the maximum rank parameter associated with the first SRS set, and the setting of the codebook subset parameters associated with the first SRS set, and the second configuration includes information identifying the number of ports of the second SRS set, the value of the maximum rank parameter associated with the second SRS set, and the setting of the codebook subset parameters associated with the second SRS set.

[0084] In a sixteenth aspect, either alone or in combination with one or more of the first to fifteenth aspects, process 400 includes providing a report including UE capability information associated with a codebook subset parameter, wherein the first configuration and the second configuration are based at least in part on the UE capability information associated with the codebook subset parameter.

[0085] In a seventeenth aspect, alone or in combination with one or more of the first to sixteenth aspects, the DCI field includes a transmit precoder matrix indicator indicating a precoder for PUSCH transmission and a transmit rank indicator indicating a number of layers associated with the PUSCH transmission.

[0086] although Figure 4 Exemplary blocks of process 400 are shown, but in some aspects, process 400 may include additional blocks, fewer blocks, different blocks, or different blocks. Figure 4 Additionally or alternatively, two or more of the blocks of process 400 may be performed in parallel.

[0087] The foregoing disclosure provides illustration and description, but is not intended to be exhaustive or to limit the aspects to the precise forms disclosed. Modifications and variations may be made in light of the above disclosure or may be acquired from practice of these aspects.

[0088] As used herein, the term "component" is intended to be broadly construed as hardware, firmware, and / or a combination of hardware and software. As used herein, a processor is implemented in hardware, firmware, and / or a combination of hardware and software.

[0089] 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.

[0090] It will be apparent that the systems and / or methods described herein may 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 the systems and / or methods is not limited in these respects. Thus, the operation and behavior of the systems and / or methods described herein are not referenced to specific software code—it should be understood that software and hardware may be designed to implement the systems and / or methods based, at least in part, on the description herein.

[0091] Even if the specific combination of features is recorded in the claims and / or disclosed in the specification, these combinations are not intended to limit the disclosure of various aspects. In fact, many of these features can be combined in a manner that is not specifically recorded in the claims and / or not disclosed in the specification. Although each dependent claim listed below can be directly attached to only one claim, the disclosure of various aspects includes the combination of each dependent claim with each other claim in the claims. The phrase "at least one of" the referenced item list refers to any combination of those items, including a single member. As an example, "at least one of a, b or c" is intended to cover a, b, c, ab, ac, bc and abc, and any combination of multiples of the same element (e.g., aa, aaa, aab, aac, abb, acc, bb, bbb, bbc, cc and ccc, or any other sorting of a, b and c).

[0092] Unless explicitly stated, the elements, actions or instructions used herein should not be interpreted as critical or essential. In addition, as used herein, the articles "one" and "an" are intended to include one or more items and can be used interchangeably with "one or more". In addition, as used herein, the terms "set" and "group" are intended to include one or more items (e.g., related items, unrelated items, combinations of related and unrelated items, etc.), and can be used interchangeably with "one or more". When only one item is expected, the phrase "only one" or similar language is used. In addition, as used herein, the term "having" and / or similar terms are intended to be open terms. In addition, the phrase "based on" is intended to mean "based at least in part on", unless otherwise explicitly stated.

Claims

1. A method of wireless communication performed by a user equipment (UE), comprising: determining a first configuration for a first sounding reference signal (SRS) set and a second configuration for a second SRS set, The first SRS set is to be transmitted using a first set of antennas of the UE, and the second SRS set is to be transmitted using a second set of antennas of the UE; determining, based at least in part on the first configuration and the second configuration, a size of a DCI field to be included in an uplink downlink control information (DCI) communication scheduling a physical uplink shared channel (PUSCH) transmission, The DCI field indicates the selected SRS set; receiving uplink DCI communications scheduling PUSCH transmissions; as well as identifying the selected SRS set based at least in part on the determined size of the DCI field and information carried in the DCI field, The selected SRS set is the first SRS set or the second SRS set.

2. The method according to claim 1, further comprising: sending the PUSCH transmission based at least in part on the identified selected SRS set, wherein, when the first SRS set is the selected SRS set, the PUSCH transmission is sent using the first group of antennas, and Wherein, when the second SRS set is the selected SRS set, the PUSCH transmission is sent using the second group of antennas.

3. The method according to claim 1, further comprising: transmitting the first set of SRS using the first group of antennas and based at least in part on the first configuration; as well as The second set of SRS is transmitted using the second group of antennas and based at least in part on the second configuration.

4. The method according to claim 1, wherein: The DCI field includes one or more padding bits associated with avoiding DCI size mismatch.

5. The method according to claim 1, wherein: The UE is configured for non-codebook based PUSCH transmission, and usage of the first SRS set and the second SRS set is configured as non-codebook based.

6. The method according to claim 1, wherein: The first SRS set has up to four SRSs, and the second SRS set has up to four SRSs.

7. The method according to claim 1, wherein: The first SRS set has up to four SRSs, and the second SRS set has up to two SRSs.

8. The method according to claim 1, further comprising: providing a report including UE capability information associated with the number of SRSs per group of antennas of the UE, The first configuration and the second configuration are based at least in part on the UE capability information associated with the number of SRSs per group of antennas.

9. The method according to claim 1, wherein: The first configuration includes information identifying a number of SRSs in the first SRS set and a maximum number of layers associated with the first SRS set, and The second configuration includes information identifying a number of SRSs in the second SRS set and a maximum number of layers associated with the second SRS set.

10. The method according to claim 1, further comprising: providing a report including UE capability information associated with a maximum number of SRS resources that may be configured to the UE for simultaneous transmission in the same symbol and a maximum number of SRS resources, The first configuration and the second configuration are at least partially based on the UE capability information.

11. The method according to claim 1, wherein: The DCI field includes an SRS resource indicator indicating a precoder for the PUSCH transmission and a number of layers associated with the PUSCH transmission.

12. The method according to claim 1, wherein: The UE is configured for codebook-based PUSCH transmission, and usage of the first SRS set and the second SRS set is configured to be codebook-based.

13. The method according to claim 1, wherein: The first SRS set has up to four ports, and the second SRS set has up to four ports.

14. The method according to claim 1, wherein: The first SRS set has up to four ports, and the second SRS set has up to two ports.

15. The method according to claim 1, further comprising: providing a report including UE capability information associated with the number of ports per antenna group of the UE, The first configuration and the second configuration are based at least in part on the UE capability information associated with the number of ports per antenna group.

16. The method of claim 1, wherein: The first configuration includes information identifying a number of ports of the first SRS set, a value of a maximum rank parameter associated with the first SRS set, and a setting of a codebook subset parameter associated with the first SRS set, and The second configuration includes information identifying a number of ports of the second SRS set, a value of a maximum rank parameter associated with the second SRS set, and a setting of a codebook subset parameter associated with the second SRS set.

17. The method according to claim 1, further comprising: providing a report including UE capability information associated with a codebook subset parameter, The first configuration and the second configuration are based at least in part on the UE capability information associated with the codebook subset parameter.

18. The method according to claim 1, wherein: The DCI field includes a transmit precoder matrix indicator indicating a precoder of the PUSCH transmission and a transmit rank indicator indicating a number of layers associated with the PUSCH transmission.

19. A user equipment (UE) for wireless communication, comprising: Memory; as well as one or more processors operably coupled to the memory, the memory and the one or more processors being configured to: determining a first configuration for a first sounding reference signal (SRS) set and a second configuration for a second SRS set, The first SRS set is to be transmitted using a first set of antennas of the UE, and the second SRS set is to be transmitted using a second set of antennas of the UE; determining, based at least in part on the first configuration and the second configuration, a size of a DCI field to be included in an uplink downlink control information (DCI) communication scheduling a physical uplink shared channel (PUSCH) transmission, The DCI field indicates the selected SRS set; receiving uplink DCI communications scheduling PUSCH transmissions; as well as identifying the selected SRS set based at least in part on the determined size of the DCI field and information carried in the DCI field, The selected SRS set is the first SRS set or the second SRS set.

20. A non-transitory computer readable medium storing one or more instructions for wireless communication, the one or more instructions comprising: One or more instructions, when executed by one or more processors of a user equipment (UE), cause the one or more processors to: determining a first configuration for a first sounding reference signal (SRS) set and a second configuration for a second SRS set, The first SRS set is to be transmitted using a first set of antennas of the UE, and the second SRS set is to be transmitted using a second set of antennas of the UE; determining, based at least in part on the first configuration and the second configuration, a size of a DCI field to be included in an uplink downlink control information (DCI) communication scheduling a physical uplink shared channel (PUSCH) transmission, The DCI field indicates the selected SRS set; receiving uplink DCI communications scheduling PUSCH transmissions; as well as identifying the selected SRS set based at least in part on the determined size of the DCI field and information carried in the DCI field, The selected SRS set is the first SRS set or the second SRS set.

21. An apparatus for wireless communication, comprising: means for determining a first configuration for a first sounding reference signal (SRS) set and a second configuration for a second SRS set, The first set of SRS is to be transmitted using a first set of antennas of the apparatus, and the second set of SRS is to be transmitted using a second set of antennas of the apparatus; means for determining a size of a DCI field to be included in an uplink downlink control information (DCI) communication scheduling a physical uplink shared channel (PUSCH) transmission based at least in part on the first configuration and the second configuration, The DCI field indicates the selected SRS set; means for receiving an uplink DCI communication scheduling a PUSCH transmission; as well as means for identifying the selected SRS set based at least in part on the determined size of the DCI field and information carried in the DCI field, The selected SRS set is the first SRS set or the second SRS set.

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