User equipment and network node and wireless communication method performed thereby

Abstract

A UE and a network node for wireless communication and a wireless communication method performed by the same are provided. The UE comprises: a memory; and one or more processors, coupled to the memory, configured to transmit to a network node a bitmap associated with transmitting a subset of a set of precoding matrix indicators (TPMIs), where each TPMI in the set of TPMIs supports a maximum transmit power for uplink communications according to a power level of the UE, and wherein at least one TPMI of the set of TPMIs supporting the maximum transmit power is not represented by any individual bits of the bitmap; and transmitting an uplink communication using a first TPMI included in the set of TPMIs and using a power allocation process associated with a transmission using the first TPMI.

Description

[0001] This application is a divisional application of an invention patent application with an application date of August 12, 2020, application number 202080057656.0, and invention name “Signaling and configuration of maximum transmit power using a virtual port”.

[0002] CROSS-REFERENCE TO RELATED APPLICATIONS

[0003] This patent application claims priority to U.S. Provisional Patent Application No. 62 / 888,169, filed on August 16, 2019, entitled “SIGNALING AND CONFIGURATION OF MAXIMUM TRANSMIT POWER USING VIRTUAL PORTS,” and priority to U.S. Non-Provisional Patent Application No. 16 / 990,376, filed on August 11, 2020, entitled “SIGNALING AND CONFIGURATION OF MAXIMUM TRANSMIT POWER USING VIRTUAL PORTS,” which are expressly incorporated herein by reference. Technical Field

[0004] Aspects of the present disclosure relate generally to wireless communications, and to techniques and apparatus for signaling and configuration of maximum transmit power using virtual ports. Background Art

[0005] Wireless communication systems are widely deployed to provide a variety of telecommunication services, such as telephone, 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, 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 announced by the Third Generation Partnership Project (3GPP).

[0006] A wireless communication network may include multiple base stations (BS) that can support communication of multiple user equipments (UEs). User equipments (UEs) may communicate with base stations (BSs) via downlinks and uplinks. Downlinks (or forward links) refer to the communication link from a BS to a UE, while uplinks (or reverse links) refer to the 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.

[0007] The above-mentioned multiple access technologies have been adopted in various telecommunication standards to provide a common protocol that enables different user devices 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 published 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 other open standards using orthogonal frequency division multiplexing (OFDMA) with cyclic prefix (CP) (CP-OFDMA) on the downlink (DL), using CP-OFDMA and / or SC-FDM (e.g., also known as discrete Fourier transform spread OFDM (DFT-s-OFDM)) on the uplink (UL), as well as supporting 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

[0008] In some aspects, a wireless communication method performed by a user equipment (UE) may include: sending an indication to a base station as to whether the UE can use a virtual port to send uplink communications using a maximum transmit power according to a power class of the UE, wherein the virtual port is a combination of two or more antenna ports; and receiving a sounding reference signal configuration from the base station based at least in part on the indication.

[0009] In some aspects, a wireless communication method performed by a UE may include: sending a bitmap to a base station, the bitmap indicating a set of transmit precoding matrix indicators (TPMIs) that support a maximum transmit power for uplink communication according to a power class of the UE, wherein at least one TPMI in the TPMI set that supports the maximum transmit power is not represented by any individual bit of the bitmap; and sending uplink communication using a first TPMI included in the TPMI set and using a power allocation process associated with transmission using the first TPMI.

[0010] In some aspects, a wireless communication method performed by a base station may include: receiving an indication from a UE as to whether the UE is able to use a virtual port to send uplink communications using a maximum transmit power based on a power class of the UE, wherein the virtual port is a combination of two or more antenna ports; and sending a sounding reference signal configuration to the UE based at least in part on the indication.

[0011] In some aspects, a wireless communication method performed by a base station may include: receiving a bitmap from a UE, the bitmap indicating a set of TPMIs that support a maximum transmit power for uplink communication according to a power class of the UE, wherein at least one TPMI in the set of TPMIs that supports the maximum transmit power is not represented by any individual bit of the bitmap; and sending an instruction to the UE to transmit using the maximum transmit power and a TPMI included in the set of TPMIs.

[0012] 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: send an indication to a base station of whether the UE can use a virtual port to send uplink communications using a maximum transmit power according to a power class of the UE, wherein the virtual port is a combination of two or more antenna ports; and receive a sounding reference signal configuration from the base station based at least in part on the indication.

[0013] 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: send a bitmap to a base station, the bitmap indicating a set of TPMIs supporting a maximum transmit power for uplink communication according to a power class of the UE, wherein at least one TPMI in the set of TPMIs supporting the maximum transmit power is not represented by any individual bit of the bitmap; and send uplink communication using a first TPMI included in the set of TPMIs and using a power allocation procedure associated with transmission using the first TPMI.

[0014] In some aspects, a base station 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: receive from a UE an indication of whether the UE can use a virtual port to send uplink communications using a maximum transmit power according to a power class of the UE, wherein the virtual port is a combination of two or more antenna ports; and send a sounding reference signal configuration to the UE based at least in part on the indication.

[0015] In some aspects, a base station 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: receive a bitmap from a UE, the bitmap indicating a TPMI set supporting a maximum transmit power for uplink communication according to a power class of the UE, wherein at least one TPMI in the TPMI set supporting the maximum transmit power is not represented by any individual bit of the bitmap; and send an instruction to the UE to transmit using the maximum transmit power and a TPMI included in the TPMI set.

[0016] In some aspects, a non-transitory computer-readable medium may store one or more instructions for wireless communication. When executed by one or more processors of a UE, the one or more instructions may cause the one or more processors to: send an indication to a base station of whether the UE can use a virtual port to send uplink communications using a maximum transmit power according to a power class of the UE, wherein the virtual port is a combination of two or more antenna ports; and receive a sounding reference signal configuration from the base station based at least in part on the indication.

[0017] In some aspects, a non-transitory computer-readable medium may store one or more instructions for wireless communication. When executed by one or more processors of a UE, the one or more instructions may cause the one or more processors to: send a bitmap to a base station, the bitmap indicating a set of TPMIs that support a maximum transmit power for uplink communication according to a power class of the UE, wherein at least one TPMI in the set of TPMIs that supports the maximum transmit power is not represented by any individual bit of the bitmap; and send uplink communication using a first TPMI included in the set of TPMIs and using a power allocation procedure associated with transmission using the first TPMI.

[0018] In some aspects, a non-transitory computer-readable medium may store one or more instructions for wireless communication. When executed by one or more processors of a base station, the one or more instructions may cause the one or more processors to: receive from a UE an indication of whether the UE can use a virtual port to send uplink communications using a maximum transmit power according to a power class of the UE, wherein the virtual port is a combination of two or more antenna ports; and send a sounding reference signal configuration to the UE based at least in part on the indication.

[0019] In some aspects, a non-transitory computer-readable medium may store one or more instructions for wireless communication. When executed by one or more processors of a base station, the one or more instructions may cause the one or more processors to: receive a bitmap from a UE, the bitmap indicating a TPMI set supporting a maximum transmit power for uplink communication according to a power class of the UE, wherein at least one TPMI in the TPMI set supporting the maximum transmit power is not represented by any individual bit of the bitmap; and send an instruction to the UE to transmit using the maximum transmit power and a TPMI included in the TPMI set.

[0020] In some aspects, an apparatus for wireless communication may include: a component for sending an indication to a base station as to whether the apparatus can use a virtual port to send uplink communications using a maximum transmit power based on a power class of the apparatus, wherein the virtual port is a combination of two or more antenna ports; and a component for receiving a sounding reference signal configuration from the base station based at least in part on the indication.

[0021] In some aspects, an apparatus for wireless communication may include: a component for sending a bitmap to a base station, the bitmap indicating a set of TPMIs that support a maximum transmit power for uplink communication according to a power class of the apparatus, wherein at least one TPMI in the set of TPMIs that support the maximum transmit power is not represented by any individual bit of the bitmap; and a component for sending uplink communication using a first TPMI included in the set of TPMIs and using a power allocation process associated with sending using the first TPMI.

[0022] In some aspects, an apparatus for wireless communication may include: a component for receiving an indication from a UE whether the UE can use a virtual port to send uplink communications using a maximum transmit power based on a power class of the UE, wherein the virtual port is a combination of two or more antenna ports; and a component for sending a sounding reference signal configuration to the UE based at least in part on the indication.

[0023] In some aspects, an apparatus for wireless communication may include: a component for receiving a bitmap from a UE, the bitmap indicating a set of TPMIs that support a maximum transmit power for uplink communication according to a power class of the UE, wherein at least one TPMI in the set of TPMIs that support the maximum transmit power is not represented by any individual bit of the bitmap; and a component for sending an instruction to the UE to transmit using the maximum transmit power and a TPMI included in the set of TPMIs.

[0024] In some aspects, a user equipment (UE) for wireless communication may include: a memory; and one or more processors coupled to the memory, configured to: send a bitmap associated with a subset of a transmit precoding matrix indicator (TPMI) set to a network node, wherein each TPMI in the TPMI set supports a maximum transmit power for uplink communication according to a power class of the UE, and wherein at least one TPMI in the TPMI set that supports the maximum transmit power is not represented by any individual bit of the bitmap; and send uplink communication using a first TPMI included in the TPMI set and using a power allocation process associated with transmission using the first TPMI.

[0025] In some aspects, a wireless communication method performed by a user equipment (UE) may include: sending a bitmap associated with a subset of a transmit precoding matrix indicator (TPMI) set to a network node, wherein each TPMI in the TPMI set supports a maximum transmit power for uplink communications according to a power class of the UE, and wherein at least one TPMI in the TPMI set that supports the maximum transmit power is not represented by any individual bit of the bitmap; and sending uplink communications using a first TPMI included in the TPMI set and using a power allocation process associated with transmission using the first TPMI.

[0026] In some aspects, a network node for wireless communication may include: a memory; and one or more processors coupled to the memory, configured to: receive a bitmap associated with a subset of a transmit precoding matrix indicator (TPMI) set from a user equipment (UE), wherein each TPMI in the TPMI set supports a maximum transmit power for uplink communication according to a power class of the UE, and wherein at least one TPMI in the TPMI set that supports the maximum transmit power is not represented by any individual bit of the bitmap; and send an instruction to the UE to transmit using the maximum transmit power and the TPMIs included in the TPMI set.

[0027] In some aspects, a wireless communication method performed by a network node may include: receiving from a user equipment (UE) a bitmap associated with a subset of a transmit precoding matrix indicator (TPMI) set, wherein each TPMI in the TPMI set supports a maximum transmit power for uplink communication according to a power class of the UE, and wherein at least one TPMI in the TPMI set that supports the maximum transmit power is not represented by any individual bit of the bitmap; and sending an instruction to the UE to transmit using the maximum transmit power and a TPMI included in the TPMI set.

[0028] 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 illustrated by the accompanying figures and description.

[0029] The features and technical advantages of examples according to the present disclosure have been outlined quite broadly above so that the following detailed description may be better understood. Additional features and advantages will be described below. The disclosed concepts and specific examples may be readily used as a basis for modifying or designing other structures for achieving the same purpose as the present disclosure. Such equivalent structures do not depart from the scope of the appended claims. The characteristics of the concepts disclosed herein, their organization and methods of operation, and related 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 the purpose of illustration and description and not as a definition of limitations of the claims. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to be able to understand the above-mentioned features of the present disclosure in detail, a more specific description briefly summarized above can be obtained by reference to various aspects, some of which 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 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 identify the same or similar elements.

[0031] Figure 1 is a block diagram illustrating an example of a wireless communication network according to aspects of the present disclosure.

[0032] Figure 2 is a block diagram illustrating an example of a base station communicating with a UE in a wireless communication network according to aspects of the present disclosure.

[0033] Figure 3 is a diagram illustrating an example of forming a virtual port by combining incoherent and / or partially coherent antenna ports according to aspects of the present disclosure.

[0034] Figure 4 is a diagram illustrating an example of a sounding reference signal resource set according to aspects of the present disclosure.

[0035] Figure 5 is a diagram illustrating an example of a UE hardware architecture using virtual ports to support maximum transmit power according to aspects of the present disclosure.

[0036] Figure 6-Figure 10 is a diagram illustrating an example of signaling and configuration using maximum transmit power of a virtual port according to aspects of the present disclosure.

[0037] Fig.11 and Fig.12 is a diagram illustrating an example process performed, for example, by a user device, according to aspects of the present disclosure.

[0038] Fig.13 and Fig.14 is a diagram illustrating example processes performed, for example, by a base station according to aspects of the present disclosure. DETAILED DESCRIPTION

[0039] The various aspects of the present disclosure will be 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 interpreted as being limited to any specific structure or function presented throughout the present disclosure. On the contrary, these aspects are provided so that the present disclosure will be comprehensive and complete, and the scope of the present disclosure will be fully conveyed to those skilled in the art. Based on the teachings herein, 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 present disclosure disclosed herein, whether 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: the device or method uses other structures, functions, or structures plus functions in addition to or different from the various aspects of the present disclosure set forth herein to practice. It should be understood that any aspect of the present disclosure can be embodied by one or more elements of the claims.

[0040] 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 may be implemented using hardware, software, or a combination thereof. Whether these elements are implemented as hardware or software depends on the specific application and the design constraints imposed on the overall system.

[0041] It should be noted that although various aspects may be described herein using terms typically associated with 3G and / or 4G wireless technologies, various aspects of the present disclosure may be applied to other generation-based communication systems, such as 5G and later communication systems, including NR technologies.

[0042] Figure 1is a 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 the coverage area, depending on the context in which the term is used.

[0043] 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 subscription. A pico cell may cover a relatively small geographic area and may allow unrestricted access by UEs with service subscription. A femto cell may cover a relatively small geographic area (e.g., a home) 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 1 In the example shown, 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.

[0044] In some aspects, the cell is not necessarily 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 with each other and / or with one or more other BSs or network nodes (not shown) in the wireless network 100 through various types of backhaul interfaces (such as direct physical connections, virtual networks, etc.) using any suitable transport network.

[0045] The wireless network 100 may also include a relay station. A relay station is an entity that can receive data transmissions from an upstream station (e.g., a BS or a UE) and send data transmissions 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, 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, or the like.

[0046] The wireless network 100 may be a heterogeneous network including different types of BSs, such as a macro BS, a pico BS, a femto BS, a relay BS, etc. These different types of BSs may have different transmit power levels, different coverage areas, and different effects 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).

[0047] 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.

[0048] 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, 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 component or sensor, a smart meter / sensor, an industrial manufacturing device, a global positioning system device, or any other suitable device configured to communicate via a wireless or wired medium.

[0049] 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, location 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 a connection to a network (e.g., a wide area network such as the Internet or a cellular network) or to the 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 narrowband Internet of Things (NB-IoT) devices. Some UEs may be considered as user premises equipment (CPE). UE 120 may be included in a housing that houses components of UE 120 (e.g., processor components, memory components, etc.).

[0050] Generally, any number of wireless networks can be deployed in a given geographic area. Each wireless network can support a specific 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.

[0051] 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 communicating with each other) 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.

[0052] As noted above, providing Figure 1 As an example. Other examples may differ from the Figure 1 as described.

[0053] Figure 2 A block diagram of a design 200 of a base station 110 and a UE 120 is shown, 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.

[0054] 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 (one or more) 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) and the like) 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., pre-coding) 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, position coding may be used to generate synchronization signals to convey additional information.

[0055] 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 (DEMODs) 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.

[0056] 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., including reports of RSRP, RSSI, RSRQ, CQI, etc.) from a 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 pre-decoded 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 the decoded data to the data sink 239 and provide the 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.

[0057] The controller / processor 240 of the base station 110, the controller / processor 280 of the UE 120, and / or Figure 2Any other component of the base station 110 may perform one or more techniques associated with signaling and configuring the maximum transmit power using the virtual port, as described in more detail elsewhere herein. For example, the controller / processor 240 of the base station 110, the controller / processor 280 of the UE 120, and / or Figure 2 Any other component(s) of may perform or direct e.g. Fig.11 Process 1100, Fig.12 The process 1200 Fig.13 The process of 1300 Fig.14 The operations of process 1400 and / or other processes described herein may be performed by the memory 242 and 282. The memories 242 and 282 may store data and program codes for the base station 110 and the UE 120, respectively. In some aspects, the memory 242 and / or the memory 282 may include a non-transitory computer-readable medium storing one or more instructions for wireless communication. For example, when executed by one or more processors of the base station 110 and / or the UE 120, the one or more instructions may perform or direct, for example, Fig.11 Process 1100, Fig.12 The process 1200 Fig.13 The process of 1300 Fig.14 The operations of process 1400 and / or other processes described herein. Scheduler 246 may schedule UEs to transmit data on the downlink and / or uplink.

[0058] In some aspects, UE 120 may include: a component for sending an indication to a base station of whether UE 120 can use a virtual port to send uplink communications using a maximum transmit power according to a power class of UE 120, wherein the virtual port is a combination of two or more antenna ports; a component for receiving a sounding reference signal configuration from the base station based at least in part on the indication, etc. Additionally or alternatively, UE 120 may include: a component for sending a bitmap to the base station, the bitmap indicating a set of TPMIs that support a maximum transmit power for uplink communications according to a power class of UE 120, wherein at least one TPMI in the set of TPMIs that support the maximum transmit power is not represented by any individual bit of the bitmap; and a component for sending uplink communications using a first TPMI included in the set of TPMIs and using a power allocation process associated with transmission using the first TPMI, etc. In some aspects, the component may include combining Figure 2 One or more components of the UE 120 described herein, such as the controller / processor 280, the transmit processor 264, the TX MIMO processor 266, the MOD 254, the antenna 252, the DEMOD 254, the MIMO detector 256, the receive processor 258, etc. Figure 3 Describes virtual ports and TPMI in more detail.

[0059] In some aspects, the base station 110 may include: a component for receiving an indication from the UE whether the UE can use a virtual port to transmit uplink communications using a maximum transmit power according to the power class of the UE, wherein the virtual port is a combination of two or more antenna ports; and a component for sending a sounding reference signal configuration to the UE based at least in part on the indication, etc. Additionally or alternatively, the base station 110 may include: a component for receiving a bitmap from the UE, the bitmap indicating a set of TPMIs that support a maximum transmit power for uplink communications according to the power class of the UE, wherein at least one TPMI in the set of TPMIs that support the maximum transmit power is not represented by any individual bit of the bitmap; and a component for sending an instruction to the UE to transmit using the maximum transmit power and a TPMI included in the set of TPMIs, etc. In some aspects, the component may include a combination of 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 the like.

[0060] As noted above, providing Figure 2 As an example. Other examples may differ from the Figure 2 as described.

[0061] Figure 3 is a diagram illustrating an example 300 of forming virtual ports by combining incoherent and / or partially coherent antenna ports in accordance with aspects of the present disclosure.

[0062] Depending on the coherence of the antenna ports of the UE 120, the multi-antenna UE 120 and / or the antenna port set of the UE 120 can be classified into one of three groups. If the relative phase between the antenna port set (e.g., between two antenna ports) remains the same between the time of the sounding reference signal (SRS) transmission from these antenna ports and the subsequent physical uplink shared channel (PUSCH) transmission from these antenna ports, then the antenna port set (e.g., two antenna ports) is coherent. When this is the case, since the relative phase of the antenna ports will be the same for the SRS transmission and the PUSCH transmission, the uplink predecoder for pre-decoding the PUSCH transmission can be determined (e.g., by the UE 120 and / or the base station 110) using the SRS. In this case, the pre-decoding can span the coherent antenna port (sometimes referred to as the coherent port) set. If the antenna port set is incoherent (i.e., non-coherent), then the determination of the uplink predecoder becomes difficult because the relative phase of the antenna ports will change from the SRS transmission to the PUSCH transmission.

[0063] For example, if the relative phase between a set of antenna ports is different for SRS transmission and PUSCH transmission, the set of antenna ports is considered to be incoherent. In this case, precoding does not span the set of incoherent antenna ports (sometimes referred to as incoherent ports). In addition, if a first subset of the set of antenna ports are coherent with each other, and a second subset of the set of antenna ports are coherent with each other, but the first subset of antenna ports and the second subset of antenna ports are incoherent with each other, the set of antenna ports is considered to be partially coherent. In this case, common precoding can be used within a subset of coherent ports, but cannot be used across a subset of incoherent ports. However, certain techniques can be applied to synthesize virtual antenna ports (sometimes referred to herein as virtual ports) from antenna ports that lack coherence (e.g., so that common precoding can be used on virtual ports and applied to incoherent antenna ports).

[0064] For example, as shown in reference numeral 305, a set of non-coherent antenna ports (e.g., shown as two non-coherent antenna ports) may be combined into a single virtual port using pre-coding (e.g., uplink pre-coding, pre-coding for sub-channel weighting using TPMI, pre-coding for space division multiplexing, etc.) and cyclic delay diversity. The pre-decoder may be determined by UE120 and / or signaled by base station 110. Cyclic delay diversity (CDD) may refer to a technique in which a delay (e.g., a cyclic delay) is introduced to one of the non-coherent ports but not to another non-coherent port. The delay may be measured in samples (e.g., 5 samples, 10 samples, etc.), fractions of samples, etc. For example, a first non-coherent port may send a first sample stream, and a second non-coherent port may send a second sample stream (e.g., which may be the same stream) with a slight cyclic delay (e.g., a delay of 5 samples, 10 samples, etc.). For example, for a cyclic delay of 5 samples, where 16 samples are sent per symbol, a first non-coherent port may send 16 samples, where the first sample is sent first (e.g., [s1, s2, s3, s4, ..., s16]), and a second non-coherent port may send 16 samples, where the first sample is sent sixth (e.g., with a delay of 5 samples) (e.g., [s12, s13, s14, s15, s16, s1, s2, s3, ..., s11]).

[0065] Additionally or alternatively, as shown in reference numeral 310, a set of partially coherent antenna ports (sometimes referred to herein as partially coherent ports) can be combined into a single virtual port using precoding (e.g., uplink precoding) and cyclic delay diversity in a similar manner as described above. As shown, a first subset of ports can be coherent to each other, and a second subset of ports can be coherent to each other, but the two subsets can be incoherent to each other. As further shown, precoding can be applied to each subset to generate a first virtual port and a second virtual port that are incoherent to each other. CDD can then be applied to the two virtual ports (e.g., by sending communications from the virtual ports using CDD), thereby forming a single virtual port from the partially coherent ports (e.g., using precoding and CDD).

[0066] When UE 120 is configured with multiple SRS ports for multiple-input multiple-output (MIMO) mode, UE 120 may need to use a power scaling factor to evenly divide the transmit power among all antenna ports used for PUSCH transmission. The power scaling factor may be equal to the number of antenna ports with non-zero PUSCH transmit power divided by the maximum number of SRS ports supported by UE 120 in one SRS resource. In this case, UE 120 may not be able to transmit at the maximum transmit power because UE 120 needs to evenly divide the transmit power among all antenna ports on which the UE is configured to transmit PUSCH communications. For example, as shown in reference numeral 315, when UE 120 transmits on a single port (shown as port 0) of two configured ports (port 0 and port 1) using pre-coding, the transmit power of the transmission on the single port (port 0) is scaled by a factor of 1 / 2 (half).

[0067] In some cases, the base station 110 may need to instruct the UE 120 to transmit at maximum power, such as when the UE 120 is near a cell edge or otherwise has poor link quality with the base station 110. However, different UEs 120 may have different capabilities regarding virtual port synthesis and which virtual ports of the UE 120 are capable of supporting maximum transmit power. For example, depending on the hardware components of the UE 120, the number of transmit antennas of the UE 120, the number of transmit chains of the UE 120, the maximum transmit power supported by different power amplifiers and / or different combinations of power amplifiers of the UE 120, etc., the UE 120 may or may not be able to synthesize virtual ports that support the maximum transmit power (e.g., of the power class of the UE 120) and / or may only support the maximum transmit power for virtual ports that are a combination of a specific set of actual antenna ports of the UE 120.

[0068] In order for the base station 110 to instruct the UE 120 about the precoder to be used for transmission at maximum power (e.g., corresponding to the transmit precoding matrix indicator (TPMI)), the base station 110 needs to know which precoder(s) of the UE 120 are capable of supporting transmission at maximum power. However, the base station 110 may not have information about such capabilities of the UE 120, which may result in an instruction to use the UE 120 to transmit at maximum power using a precoder that is not capable of transmitting at maximum power. Some techniques and apparatus described herein allow the UE 120 to signal capabilities regarding a virtual port of the UE 120 that supports maximum transmit power, a precoder that supports the maximum transmit power of the UE 120 (e.g., TPMI), etc. In this way, the base station 110 can configure and / or instruct the UE 120 to transmit at maximum transmit power using a virtual port and / or precoder that supports maximum transmit power. In addition, some techniques and apparatus described herein allow the UE 120 to transmit at maximum transmit power using a virtual port without being limited by the power scaling requirements described above.

[0069] Although Figure 3 Antenna port pairs are shown in sets and subsets, but in some aspects, a set or subset may include a different number of antenna ports. For example, an antenna port set or antenna port subset may include three antenna ports, four antenna ports, etc.

[0070] As indicated above, provide Figure 3 As an example. Other examples may differ from the Figure 3 as described.

[0071] Figure 4 is a diagram illustrating an example 400 of sounding reference signal (SRS) resource sets in accordance with aspects of the present disclosure.

[0072] The base station 110 may configure one or more SRS resource sets for the UE 120 so as to allocate resources for SRS transmission of the UE 120. For example, the configuration for the SRS resource set may be indicated in a radio resource control (RRC) message (e.g., an RRC configuration message, an RRC reconfiguration message, etc.). As indicated by reference numeral 405, the SRS resource set may include one or more resources (e.g., shown as SRS resources), which may include time resources and / or frequency resources (e.g., time slots, symbols, resource blocks, periodicity of time resources, etc.).

[0073] As indicated by reference numeral 410, the SRS resource may include one or more antenna ports on which the SRS is to be transmitted (e.g., in a time-frequency resource). Thus, the configuration for an SRS resource set may indicate one or more time-frequency resources on which the SRS is to be transmitted, and may indicate one or more antenna ports on which the SRS is to be transmitted in those time-frequency resources. In some aspects, the configuration for an SRS resource set may indicate a use case for the SRS resource set (e.g., in an SRS-SetUse information element). For example, an SRS resource set may have use cases for antenna switching, codebook, non-codebook, beam management, etc.

[0074] The antenna switching SRS resource set may be used to indicate downlink channel state information (CSI) with reciprocity between uplink and downlink channels. For example, when there is reciprocity between the uplink channel and the downlink channel, the base station 110 may use the antenna switching SRS (e.g., an SRS sent using resources of the antenna switching SRS resource set) to obtain downlink CSI (e.g., to determine a downlink precoder to be used for communication with the UE 120) based at least in part on the uplink CSI determined using the antenna switching SRS.

[0075] When base station 110 indicates an uplink pre-decoder to UE 120, the codebook SRS resource set may be used to indicate uplink CSI. For example, when base station 110 is configured to indicate an uplink pre-decoder to UE 120 (e.g., using a pre-decoder codebook), base station 110 may use a codebook SRS (e.g., an SRS sent using resources of a codebook SRS resource set) to obtain uplink CSI (e.g., to determine an uplink pre-decoder to be indicated to UE 120 and used by UE 120 to communicate with base station 110). In some aspects, at least for codebook SRS, a virtual port (e.g., a combination of two or more antenna ports) with maximum transmit power may be supported.

[0076] When UE 120 selects an uplink precoder (e.g., instead of base station 110 indicating an uplink precoder to be used by UE 120), a non-codebook SRS resource set may be used to indicate uplink CSI. For example, when UE 120 is configured to select an uplink precoder, base station 110 may use a non-codebook SRS (e.g., an SRS sent using resources of a non-codebook SRS resource set) to obtain uplink CSI. In this case, the non-codebook SRS may be precoded using a precoder selected by UE 120 (e.g., which may be indicated to base station 110).

[0077] The beam-managed SRS resource set may be used to indicate CSI for millimeter wave communications.

[0078] like Figure 4 As shown, in some aspects, different SRS resource sets (e.g., having different use cases) indicated to UE 120 can overlap (e.g., in time, frequency, etc., such as in the same time slot). For example, as shown in reference numeral 415, a first SRS resource set (e.g., shown as SRS resource set 1) is shown as having an antenna switching use case. As shown, the example antenna switching SRS resource set includes a first SRS resource (shown as SRS resource A) and a second SRS resource (shown as SRS resource B). Therefore, the antenna switching SRS can be sent in SRS resource A (e.g., a first time-frequency resource) using antenna port 0 and antenna port 1, and can be sent in SRS resource B (e.g., a second time-frequency resource) using antenna port 2 and antenna port 3.

[0079] As shown in reference numeral 420, a second SRS resource set (e.g., shown as SRS resource set 2) may be a codebook use case. As shown, the example codebook SRS resource set includes only the first SRS resource (shown as SRS resource A). Therefore, the codebook SRS may be sent in SRS resource A (e.g., the first time-frequency resource) using antenna port 0 and antenna port 1. In this case, UE 120 may not use antenna port 2 and antenna port 3 to send the codebook SRS in codebook resource B (e.g., the second time-frequency resource).

[0080] As above combined Figure 3 As described, when UE 120 is configured with multiple SRS ports for MIMO mode, UE 120 may be required to use a power scaling factor to evenly divide the transmit power among all antenna ports used for PUSCH transmission. In this case, UE 120 may not be able to transmit at maximum transmit power using a virtual port that is a combination of multiple non-coherent ports and / or multiple partially coherent ports because UE 120 is required to evenly divide the transmit power among all antenna ports on which the UE transmits PUSCH communications at non-zero transmit power. Some techniques and apparatus described herein allow UE 120 to transmit at maximum transmit power using a virtual port that includes multiple ports (e.g., configured by an SRS configuration).

[0081] As indicated above, provide Figure 4 As an example. Other examples may differ from the Figure 4 as described.

[0082] Figure 5 is a diagram illustrating an example 500 of a UE hardware architecture using virtual ports to support maximum transmit power in accordance with aspects of the present disclosure.

[0083] like Figure 5 As shown, the ability of UE 120 to use a virtual port to support a maximum transmit power for a power class of UE 120 may depend on the hardware architecture of UE 120. Specifically, such ability of UE 120 may depend on the number of transmit antennas (or transmit chains) of UE 120, the number of power amplifiers of UE 120, the transmit power that can be supplied by each of these power amplifiers, etc. As an example, Figure 5 UE 120 is shown having a first power amplifier (PA1) supporting a maximum power of 20 decibel-milliwatt (dBm), a second power amplifier (PA2) supporting a maximum power of 20 dBm, a third power amplifier (PA3) supporting a maximum power of 17 dBm, and a fourth power amplifier (PA4) supporting a maximum power of 17 dBm.

[0084] In some aspects, the UE 120 described herein may have a hardware architecture in which a subset (e.g., less than all) of the power amplifiers of the UE 120 individually support a maximum transmit power of the UE 120 (e.g., without combining antenna ports). For example, if the UE 120 is power class 3 with a maximum transmit power of 23 dBm, less than all of the power amplifiers of the UE 120 may individually support a transmit power of 23 dBm. In example 500, none of the power amplifiers of the UE 120 individually (e.g., without combining antenna ports) supports a maximum transmit power of 23 dBm. However, in other examples, one of the four power amplifiers may individually support a maximum transmit power of 23 dBm, two of the four power amplifiers may individually support a maximum transmit power of 23 dBm, or three of the four power amplifiers may individually support a maximum transmit power of 23 dBm. For a UE 120 having two power amplifiers (and two corresponding antennas), either none of the two power amplifiers can independently support a maximum transmit power of 23 dBm, or one of the two power amplifiers can independently support a maximum transmit power of 23 dBm.

[0085] Using this hardware architecture, for a UE 120 at power class 3 having a maximum transmit power of 23 dBm, the maximum transmit power may be achieved by synthesizing a virtual port using PA1 and PA2 (shown as virtual port 1), synthesizing a virtual port using PA2, PA3, and PA4 (shown as virtual port 2), synthesizing a virtual port using all four power amplifiers (shown as virtual port 3), etc. However, this is merely one example of a hardware architecture of the UE 120, and different UEs 120 may have different hardware architectures, such as a different number of transmit antennas (or transmit chains), a different number of power amplifiers, different transmit powers that can be supplied by different power amplifiers, etc. Therefore, some UEs 120 may not be able to synthesize a virtual port that supports the maximum transmit power for the power class of the UE 120, different UEs 120 may be able to synthesize a different number of virtual ports that supports the maximum transmit power, and different UEs 120 may be able to synthesize a virtual port that supports the maximum transmit power using different precoders (e.g., different combinations of antennas and / or power amplifiers).

[0086] As above combined Figure 3 As indicated, in order for the base station 110 to instruct the UE 120 regarding the precoder to be used for transmitting at maximum power (e.g., TPMI), the base station 110 needs to know which precoder(s) of the UE 120 are capable of supporting transmitting at maximum power. However, the base station 110 may not have information about such capabilities of the UE 120, which may result in an instruction to use the UE 120 to transmit at maximum power using a precoder that is not capable of transmitting at maximum power. Some techniques and apparatuses described herein allow the UE 120 to signal capabilities regarding a virtual port of the UE 120 that supports maximum transmit power, a precoder (e.g., TPMI) that supports the maximum transmit power of the UE 120, and the like. In this way, the base station 110 can configure and / or instruct the UE 120 to transmit at maximum transmit power using a virtual port and / or precoder that supports maximum transmit power.

[0087] As indicated above, provide Figure 5 As an example. Other examples may differ from the Figure 5 as described.

[0088] Figure 6 6 is a diagram illustrating an example 600 of signaling and configuration using maximum transmit power of a virtual port according to aspects of the present disclosure. Figure 6 As shown, UE 120 and base station 110 may communicate with each other.

[0089] As indicated by reference numeral 605, UE 120 may send an indication to base station 110 of whether UE 120 can use a virtual port to send uplink communications using a maximum transmit power. The maximum transmit power may be defined by a power class of UE 120. For example, for a UE 120 of power class 3, the maximum transmit power may be 23 dBm. As described elsewhere herein, a virtual port may be a combination of two or more non-coherent or partially coherent antenna ports of UE 120. For example, two or more non-coherent or partially coherent antenna ports may be combined (e.g., synthesized, aggregated, used together, etc.) using precoding and / or cyclic delay diversity to synthesize a virtual port. Thus, in some aspects, a virtual port may be a combination of multiple antenna ports (e.g., two or more antenna ports combined using precoding and / or cyclic delay diversity). Alternatively, the virtual port may be a single actual antenna port, where the single actual antenna port is switched and powered by a power amplifier (e.g., a higher rated power amplifier than the power amplifier from which the single actual antenna port is switched) that is capable of transmitting at maximum transmit power without combining with another antenna port. In some aspects, a UE 120 that is capable of using a virtual port to transmit uplink communications using maximum transmit power may be referred to as a Mode 2 UE, while a Mode 1 UE may refer to a UE 120 that is not capable of synthesizing virtual ports but is capable of supporting maximum transmit power by using non-coherent ports and / or partially coherent ports and cyclic delay diversity to implement a fully interfering decoder. In some aspects, a Mode 1 UE may support maximum transmit power using a pre-decoder that spans non-coherent antenna ports. For example, a Mode 1 UE may support maximum transmit power using pre-decoding and cyclic delay diversity.

[0090] Additionally or alternatively, UE 120 may send to base station 110 an indication of the number of virtual ports that UE 120 can use to send uplink communications using the maximum transmit power. For example, UE 120 may indicate that UE 120 is capable of synthesizing only one (e.g., a single) virtual port that supports the maximum transmit power. As another example, UE 120 may indicate that UE 120 is capable of synthesizing multiple virtual ports that support the maximum transmit power. In some aspects, UE 120 may use a single message, a single bit set, and / or a single field of a message to indicate whether UE 120 is capable of using a virtual port to send uplink communications using the maximum transmit power, and to indicate the number of virtual ports that UE 120 is capable of using to send uplink communications using the maximum transmit power.

[0091] As shown in reference numeral 610, as an example of a UE 120 having two transmit antennas (and / or two transmit chains), the UE 120 may send a one-bit indication (e.g., a single bit). A first value of the bit (e.g., 0) may indicate that the UE 120 is not capable of using a virtual port to transmit uplink communications using a maximum transmit power. A second value of the bit (e.g., 1) may indicate that the UE 120 is capable of using a single virtual port to transmit uplink communications using a maximum transmit power.

[0092] As shown in reference numeral 615, as an example of a UE 120 having four transmit antennas (and / or four transmit chains), the UE 120 may send a two-bit indication. A first value of the indication (e.g., 00) may indicate that the UE 120 is not capable of using a virtual port to transmit uplink communications using a maximum transmit power. A second value of the indication (e.g., 01) may indicate that the UE 120 is capable of using at least one virtual port (e.g., one or more virtual ports) to transmit uplink communications using a maximum transmit power, such as when the UE 120 is a power class 3 UE having four power amplifiers, each capable of a maximum of 17 dBm of transmission (e.g., where all four 17 dBm power amplifiers are combined to produce a power of 23 dBm). A third value of the indication (e.g., 10) may indicate that UE 120 is capable of using two virtual ports to transmit simultaneous uplink communications (e.g., using different MIMO layers) using maximum transmit power on each of the two virtual ports, such as when UE 120 is a power class 3 UE with four power amplifiers, each capable of a maximum 20 dBm transmit (e.g., where a first 20 dBm power amplifier and a second 20 dBm power amplifier are combined to produce a power of 23 dBm, and a third 20 dBm power amplifier and a fourth 20 dBm power amplifier are combined to produce a power of 23 dBm). In some aspects, the value of the indication may indicate the exact number of virtual ports (e.g., one virtual port, two virtual ports, three virtual ports, etc.) that UE 120 is capable of using to transmit uplink communications using the maximum transmit power, such as by using a fourth value of 11. For example, UE 120 and base station 110 may store in a memory information indicating an association between a fourth value (e.g., 11) and a specific number (e.g., one) of virtual ports that UE 120 can use to send uplink communications using the maximum transmit power. UE 120 may then signal that UE 120 can use the specific number of virtual ports (e.g., one) to send uplink communications using the maximum transmit power.

[0093] As another example of UE signaling, as shown in reference numeral 620, UE 120 may send a single bit to indicate whether UE 120 supports full power (e.g., a maximum transmit power for a power class of UE 120) by setting a power scaling factor in power control to 1 for all precoders. For example, this may indicate whether all transmit chains of UE 120 include corresponding power amplifiers that support the maximum transmit power. In some aspects, a UE 120 having a fully rated power amplifier (e.g., a power amplifier that supports the maximum transmit power) included in each transmit chain of UE 120 may be referred to as a capability 1 UE. If UE 120 is a capability 1 UE, UE 120 does not need to signal any additional information about the full power capability of UE 120. For example, if UE 120 is a capability 1 UE, UE 120 does not need to signal any information in the two bits described below for indicating support for mode 1 or mode 2, and does not need to signal any information about the TPMI that supports the maximum transmit power (e.g., as described below in conjunction with Figure 7-10 described), etc.

[0094] As further shown, UE 120 may send two bits indicating whether UE 120 supports only mode 1 and not mode 2, only supports mode 2 and not mode 1, supports both mode 1 and mode 2, or does not support both mode 1 and mode 2. Details about mode 1 and mode 2 have been described above. For example, mode 1 capability may refer to the ability to support maximum transmit power using a pre-decoder across non-coherent antenna ports. As another example, mode 2 capability may refer to the ability to support maximum transmit power using a virtual port. In some aspects, if UE 120 does not have any transmit chain with a full rated power amplifier (sometimes referred to as capability 2 UE), and / or if less than all (e.g., a subset) of the transmit chains of UE 120 have a full rated power amplifier (sometimes referred to as capability 3 UE), UE 120 may use these two bits. On the contrary, if UE 120 is a capability 1 UE, UE 120 does not need to signal anything in these two bits, as described above. In some aspects, if UE 120 supports Mode 2 (e.g., supports or does not support Mode 1), UE 120 may send a bitmap to base station 110 indicating a set of TPMIs that support a maximum transmit power for uplink communications, as described below in conjunction with Figure 7-10 If UE 120 does not support Mode 2, UE 120 may avoid sending the bitmap (eg, because UE 120 does not support virtual ports).

[0095] As further shown, the UE 120 may send the above information (e.g., a single bit and / or two bits) for each frequency band (e.g., frequency bands in a frequency band combination) of a frequency band-band combination supported by the UE 120 (e.g., each frequency band of each frequency band-band combination supported by the UE 120). For example, the UE 120 may have different capabilities for different frequency bands in each frequency band-band combination. In some aspects, the UE 120 may send the above information for each frequency band in each frequency band-band combination supported by the UE 120. The frequency band-band combination may indicate a combination (e.g., a pair of frequency bands) of frequency bands supported by the UE 120 (e.g., for dual connectivity, carrier aggregation, etc.).

[0096] In some aspects, UE 120 may send an indication in a field of a capability report (e.g., UE capability report). In some aspects, when each transmit chain of UE 120 includes a power amplifier capable of supporting the maximum transmit power (e.g., and thus a virtual port is not necessary to achieve the maximum transmit power), UE 120 may send a capability report with a null or invalid value in the field, or with the field excluded.

[0097] As indicated by reference numeral 625, the base station 110 may send an SRS configuration to the UE 120 based at least in part on an indication of whether the UE 120 can use the virtual port to send uplink communications using the maximum transmit power. For example, the base station 110 may determine the SRS configuration based at least in part on an indication of whether the UE 120 can use the virtual port to send uplink communications using the maximum transmit power, and may send the determined SRS configuration to the UE 120. Additionally or alternatively, the base station 110 may determine the SRS configuration based at least in part on an indication from the UE 120 of the number of virtual ports that the UE 120 can use to send uplink communications using the maximum transmit power. The UE 120 may send uplink communications (e.g., SRS, data communications, etc.) based at least in part on the SRS configuration. Additionally or alternatively, the UE 120 may send uplink communications using the virtual port. Additionally or alternatively, the UE 120 may send uplink communications using the maximum transmit power.

[0098] In some aspects, the base station 110 may determine, based at least in part on the indication, a number of SRS resources to be configured for the SRS resource set of the UE 120. Additionally or alternatively, the base station 110 may determine, based at least in part on the indication, a type (e.g., a use case, etc.) of SRS resources to be configured for the SRS resource set of the UE 120. The base station 110 may indicate the determined number and / or the determined type of SRS resources to be configured for the SRS resource set in an SRS configuration sent to the UE 120. The type of SRS resources may include, for example, antenna switching SRS resources, codebook SRS resources, non-codebook SRS resources, beam management SRS resources, etc., as described elsewhere herein.

[0099] For example, the base station 110 may generally configure the SRS resources with the same number of ports as the number of antenna ports of the UE 120 (e.g., at least for the SRS resources with the codebook use case). For example, for a UE 120 with four transmit antennas, the base station 110 allocates SRS resources (e.g., first SRS resources) including four antenna ports. However, if the UE 120 is capable of synthesizing one or more virtual ports, the base station 110 may configure additional SRS resources (e.g., second SRS resources) for the one or more virtual ports, such as Figure 6 As shown in SRS resource 2 and SRS resource 3 in FIG. 1 . For example, if UE 120 is capable of synthesizing a single virtual port, base station 110 may configure additional SRS resources with a single port (e.g., for a single virtual port) for UE 120. As another example, if UE 120 is capable of synthesizing two virtual ports, base station 110 may configure such additional SRS resources for UE 120, the additional SRS resources including Figure 6 2 and SRS resource 3 in the example (e.g., where UE 120 selects one of the two virtual ports to use the SRS resource for detection to save SRS overhead), or Figure 6 The two ports shown in SRS resource 1 in FIG. 1 (eg, one for each virtual port to allow UE 120 to detect both ports).

[0100] As indicated above, provide Figure 6 As an example. Other examples may differ from the Figure 6 as described.

[0101] Figure 7 is a diagram illustrating an example 700 of signaling and configuration using maximum transmit power of a virtual port according to aspects of the present disclosure. Figure 7 As shown, UE 120 and base station 110 may communicate with each other.

[0102] As shown in reference numeral 705, UE 120 may send a bitmap to base station 110 indicating a set of transmit precoding matrix indicators (TPMIs) supporting a maximum transmit power for uplink communications. As described above, the maximum transmit power may be defined by a power class of UE 120. The TPMI may indicate a precoder, such as an uplink precoder used to transmit (e.g., precode) uplink communications. In some aspects, the set of TPMIs supporting the maximum transmit power includes more TPMIs than the multiple TPMIs explicitly indicated by UE 120 using a bitmap. As a result, at least one TPMI in the set of TPMIs supporting the maximum transmit power is not represented by a separate bit of the bitmap. In other words, at least one TPMI in the set of TPMIs supporting the maximum transmit power is not represented by any separate bit of the bitmap.

[0103] For example, the bitmap may not include (e.g., may exclude) a separate bit indicating a TPMI in which all antennas (and / or all transmit chains) of the UE 120 are used. In this case, if the UE 120 includes four antennas (and / or four transmit chains), the bitmap may not include a bit indicating a predecoder [1, 1, 1, 1], where a value of 1 in the predecoding matrix indicates that the corresponding antenna (and / or transmit chain) is used for uplink communication. Additionally or alternatively, the bitmap may not include any bits that explicitly indicate multiple layers of TPMI. In this case, each bit in the bitmap corresponds to a single layer of TPMI. By using a bitmap that does not have a bit that explicitly indicates each possible TPMI that can support a maximum transmit power, signaling overhead can be reduced. In addition, the base station 110 may be able to use the TPMI explicitly indicated by the corresponding bit to derive a TPMI that supports the maximum transmit power and is not explicitly indicated by the corresponding bit, as described in more detail below.

[0104] As shown by reference numeral 710, in some aspects, the length of the bitmap can be 11 (eleven) bits. For example, when UE 120 includes four transmit chains and four transmit antennas, and when the connections between the transmit chains and the transmit antennas are not reconfigurable (as described below in conjunction with Figure 8-Figure 10), the length of the bitmap may be 11 bits. In the example 11-bit bitmap, the first bit of the bitmap indicates that only the first antenna of UE 120 is used to support the maximum transmit power (shown as [1 0 0 0]), the second bit of the bitmap indicates that only the second antenna of UE 120 is used to support the maximum transmit power (shown as [0 1 0 0]), the third bit of the bitmap indicates that only the third antenna of UE 120 is used to support the maximum transmit power (shown as [0 0 1 0]), the fourth bit of the bitmap indicates that only the fourth antenna of UE 120 is used to support the maximum transmit power (shown as [00 0 1]), the fifth bit of the bitmap indicates that only the first antenna and the third antenna are used to support the maximum transmit power (shown as [1 0 1 0]), the sixth bit of the bitmap indicates that only the second antenna and the fourth antenna are used to support the maximum transmit power (shown as [0 1 0 1]), the seventh bit of the bitmap indicates that only the first antenna and the second antenna are used to support the maximum transmit power (shown as [1 1 0 0]), the eighth bit of the bitmap indicates that the maximum transmit power is supported using only the first antenna and the fourth antenna (shown as [1 0 0 1]), the ninth bit of the bitmap indicates that the maximum transmit power is supported using only the second antenna and the third antenna (shown as [0 1 1 0]), the tenth bit of the bitmap indicates that the maximum transmit power is supported using only the third antenna and the fourth antenna (shown as [0 0 1 1]), and the eleventh bit of the bitmap indicates that the maximum transmit power is supported using only the first antenna, the second antenna, and the third antenna (shown as [1 1 10]). Using such a combination of TPMIs (e.g., which may include a subset of the complete set of TPMIs that support the maximum transmit power of the UE 120), the base station 110 may be able to derive the complete set of TPMIs that support the maximum transmit power of the UE 120. In some aspects, the first antenna has the largest maximum transmit power and the fourth antenna has the smallest maximum transmit power. Therefore, [11 1 0] may be indicated instead of [1 1 0 1], [1 0 1 1], and / or [0 1 1 1].

[0105] In some aspects, the bitmap indicated by UE 120 may include a bitmap associated with Figure 7 In some aspects, the number of bits included in the bitmap may depend on the number of transmit chains included in UE 120, the number of transmit antennas included in UE 120, whether the connections between the transmit chains of UE 120 and the transmit antennas of UE 120 are reconfigurable, etc. In some aspects, UE 120 may send an indication to base station 110 of whether the connections between the transmit chains of UE 120 and the transmit antennas of UE 120 are reconfigurable. Figure 8-Figure 10 Describe additional details.

[0106] In some aspects, UE 120 may under-report TPMIs that support the maximum transmit power of UE 120. For example, a complete set of TPMIs indicated by UE 120 (e.g., explicitly and / or implicitly) may include fewer TPMIs than all TPMIs that actually support the maximum transmit power of UE 120. In this way, UE 120 may avoid exposing details about the hardware architecture of UE 120.

[0107] As indicated by reference numeral 715, the base station 110 may determine a complete set of TPMIs that support the maximum transmit power of the UE 120. As indicated by reference numeral 720, the complete set of TPMIs may include a first set of TPMIs (e.g., an explicit set) that is explicitly indicated by bits in a bitmap. In example 700, the UE 120 sends a 1 for the first bit of the bitmap corresponding to TPMI [1 0 0 0], sends a 1 for the tenth bit of the bitmap corresponding to TPMI [00 1 1], and sends 0 for all other bits in the bitmap. Thus, the UE 120 explicitly indicates (e.g., using corresponding bits in the bitmap) that TPMIs [1 0 0 0] and [0 0 1 1] support the maximum transmit power of the UE 120.

[0108] As indicated by reference numeral 725, the complete TPMI set may include a second TPMI set (e.g., an implicit set) that is not explicitly represented by a bit in the bitmap. The base station 110 may determine the second TPMI set using the first TPMI set explicitly indicated by the UE 120. For example, by explicitly indicating that TPMIs [1 0 0 0] and [0 0 1 1] support the maximum transmit power of the UE 120, the UE 120 may implicitly indicate that single-layer TPMIs [1 0 1 1] and [1 1 1 1] also support the maximum transmit power of the UE 120. In some aspects, TPMI [1 1 1 1] may always support the maximum transmit power of the UE 120 and therefore need not be explicitly indicated using a bitmap. Furthermore, by explicitly indicating that TPMIs [1 0 0 0] and [0 0 1 1] support the maximum transmit power of UE 120, UE 120 may implicitly indicate that a multi-layer TPMI having a first layer [1 0 0 0] and a second layer [0 0 1 1] also supports the maximum transmit power of UE 120. These implicitly indicated TPMIs are provided as examples, and base station 110 may determine other implicit TPMIs based at least in part on the explicit TPMIs.

[0109] As another example, if UE 120 explicitly indicates that TPMIs [1 0 0 0] and [0 1 1 0] support the maximum transmit power of UE 120, this means that TPMIs [1 1 1 0] and [1 1 1 1] also support the maximum transmit power of UE 120. However, [1 1 1 0] may still be included in the 11-bit bitmap in case none of the other TPMIs in the 11-bit bitmap supports the maximum transmit power and UE 120 is able to achieve the maximum transmit power using TPMI [1 1 1 0].

[0110] As indicated by reference numeral 730, the base station 110 may send an instruction to the UE 120 to cause the UE 120 to transmit uplink communications using the maximum transmit power. The base station 110 may also indicate the TPMI to be used for the uplink transmission. The base station 110 may select the TPMI from a complete set of TPMIs that support the maximum transmit power of the UE 120. Thus, when the base station 110 instructs the UE 120 to transmit using the maximum transmit power, the base station 110 may also indicate a TPMI that supports the maximum transmit power due to the UE bitmap indication sent to the base station 110. Without such an indication, the base station 110 may instruct the UE 120 to transmit uplink communications using the maximum transmit power and a TPMI that does not support the maximum transmit power, which may result in errors, UE incompatibility, uplink transmissions at less than the maximum transmit power, etc.

[0111] As shown in reference numeral 735, UE 120 may send uplink communications using a TPMI (e.g., a first TPMI) included in the TPMI set. For example, UE 120 may send uplink communications using a TPMI indicated by base station 110, which is included in the complete TPMI set supporting the maximum transmit power. UE 120 may send uplink communications using the maximum transmit power according to instructions from base station 110. In this case, UE 120 may send uplink communications using a power allocation process associated with transmission using the TPMI. For example, UE 120 may send uplink communications by avoiding power scaling for uplink communications, avoiding applying a power scaling factor to uplink communications, avoiding performing one or more power scaling steps when sending uplink communications, and the like. In this way, even though the uplink communications are sent using multiple antenna ports, UE 120 is still able to send uplink communications using the maximum transmit power.

[0112] As indicated above, provide Figure 7 As an example. Other examples may differ from the Figure 7 as described.

[0113] Figure 8is a diagram illustrating an example 800 of signaling and configuration using maximum transmit power for a virtual port in accordance with aspects of the present disclosure.

[0114] like Figure 8 As shown, in some aspects, UE 120 may include four transmit antennas and four transmit chains. Each transmit chain may include a power amplifier. In example 800, due to the hardware architecture of UE 120, the connection between the transmit chain (or power amplifier) ​​and the antenna is not reconfigurable. For example, the power amplifier of the transmit chain may have a fixed connection to the antenna (e.g., a soldered connection, a wired connection without a switch, etc.), the transmit chain may not include a switch that allows the transmit chain and / or power amplifier to be connected to different antennas, etc. In this case, as described above in conjunction with Figure 7 As described, the length of the bitmap used by UE 120 to indicate the TPMIs supporting the maximum transmit power of UE 120 may be 11 bits. In example 800, UE 120 may indicate to base station 110 that the connection between the transmit chain of UE 120 and the transmit antenna of UE 120 is not reconfigurable. In this way, base station 110 may be able to correctly interpret the bitmap to derive a complete set of TPMIs supporting the maximum transmit power.

[0115] As indicated above, provide Figure 8 As an example. Other examples may differ from the Figure 8 as described.

[0116] Fig. 9 is a diagram illustrating an example 900 of signaling and configuration using maximum transmit power for a virtual port in accordance with aspects of the present disclosure.

[0117] like Fig. 9 As shown, in some aspects, UE 120 may include two transmit antennas and two transmit chains. Each transmit chain may include a power amplifier. In example 900, as described above in conjunction with Figure 8 As described above, the connection between the transmit chain (or power amplifier) ​​and the antenna is not reconfigurable due to the hardware architecture of UE 120. In this case, the length of the bitmap of the TPMI used by UE 120 to indicate the maximum transmit power supported by UE 120 may be 2 bits.

[0118] In the example 2 bitmap, the first bit of the bitmap indicates that the maximum transmit power is supported using only the first antenna of UE 120 (shown as [1 0]), and the second bit of the bitmap indicates that the maximum transmit power is supported using only the second antenna of UE 120 (shown as [0 1]). Using this combination of TPMIs (e.g., which may include a subset of the complete set of TPMIs that support the maximum transmit power of UE 120), base station 110 may be able to derive a complete set of TPMIs that support the maximum transmit power of UE 120. For example, the complete set of TPMIs may include [1 0] and [1 1], may include [0 1] and [1 1], or may include

[10] , [0 1], and [1 1]. In example 900, UE 120 may indicate to base station 110 that the connection between the transmit chain of UE 120 and the transmit antenna of UE 120 is not reconfigurable. In this way, base station 110 may be able to correctly interpret the bitmap to derive the complete set of TPMIs that support the maximum transmit power.

[0119] In some aspects, UE 120 may be required to use TPMI [1 0] to support maximum transmit power (e.g., using only the first antenna of UE 120). For example, UE 120 may be required to configure the initial bits of the TPMI to indicate the antennas and / or transmit chains of UE 120 that support the maximum transmit power for the power class of UE 120 (e.g., 23 dBm in the example 900). Therefore, if UE 120 has only two transmit antennas and is able to combine antenna ports to transmit uplink communications using the maximum transmit power (e.g., using a virtual port), UE 120 may be required to use only (or at least use) the first antenna of UE 120 (e.g., using TPMI [1 0]) to support the maximum transmit power. In this case, if UE 120 indicates to base station 110 that UE 120 includes only two transmit antennas, and UE 120 is capable of combining antenna ports to transmit uplink communications using a maximum transmit power, then UE 120 does not need to signal the TPMIs that support the maximum transmit power because base station 110 can infer that those TPMIs are [1 0] and [1 1].

[0120] As indicated above, provide Fig. 9 As an example. Other examples may differ from the Fig. 9 as described.

[0121] Fig.10 is a diagram illustrating an example 1000 of signaling and configuration using maximum transmit power for a virtual port in accordance with aspects of the present disclosure.

[0122] like Fig.10As shown, in some aspects, UE 120 may include four transmit antennas and four transmit chains. Each transmit chain may include a power amplifier. In example 900, due to the hardware architecture of UE 120, the connection between the transmit chain (or power amplifier) ​​and the antenna is reconfigurable. For example, the power amplifier of the transmit chain may have a reconfigurable connection to the antenna (e.g., a switch connection, a wired connection with a switch, etc.), and the transmit chain may include a switch that allows the transmit chain and / or power amplifier to be connected to different antennas, etc. In this case, the length of the bitmap of the TPMI used by UE 120 to indicate the maximum transmit power supported by UE 120 may be 3 bits.

[0123] In the example 3-bit bitmap, the first bit of the bitmap indicates that the maximum transmit power is supported using a single antenna of UE 120 (shown as [1 0 0 0]), the second bit of the bitmap indicates that the maximum transmit power is supported using exactly two antennas of UE 120 (shown as [1 1 0 0]), and the third bit of the bitmap indicates that the maximum transmit power is supported using exactly three antennas of the UE (shown as [1 1 1 0]). Using such a combination of TPMIs (e.g., which may include a subset of the complete set of TPMIs that support the maximum transmit power of UE 120), base station 110 may be able to derive the complete set of TPMIs that support the maximum transmit power of UE 120. For example, if UE 120 indicates that the maximum transmit power is supported using a single antenna of UE 120 (e.g., TPMI[1 0 0 0]), the complete TPMI set may include at least TPMI[1 0 00], TPMI[0 1 0 0], TPMI[0 0 10], and TPMI[0 0 0 1], because a power amplifier supporting the maximum transmit power (e.g., a 23 dBm power amplifier for a power class 3 UE) may be connected to any of the four antennas of UE 120. In example 1000, UE 120 may indicate to base station 110 that the connection between the transmit chain of UE 120 and the transmit antenna of UE 120 is reconfigurable. In this way, base station 110 may be able to correctly interpret the bitmap to derive the complete TPMI set supporting the maximum transmit power.

[0124] As indicated above, provide Fig.10 As an example. Other examples may differ from the Fig.10 as described.

[0125] Fig.11 is a diagram illustrating an example process 1100 performed, for example, by a UE in accordance with aspects of the present disclosure. Example process 1100 is an example of operations in which a UE (eg, UE 120, etc.) performs signaling and operations associated with using a maximum transmit power of a virtual port.

[0126] like Fig.11 As shown, in some aspects, process 1100 may include: sending an indication to a base station whether the UE can use a virtual port to send uplink communications using a maximum transmit power according to a power class of the UE, where the virtual port is a combination of two or more antenna ports (block 1110). For example, as described above, the UE (e.g., using transmit processor 264, controller / processor 280, memory 282, etc.) may send an indication to a base station whether the UE can use a virtual port to send uplink communications using a maximum transmit power according to a power class of the UE. In some aspects, the virtual port is a combination of two or more antenna ports.

[0127] like Fig.11 As further shown, in some aspects, process 1100 may include receiving a sounding reference signal configuration from a base station based at least in part on the indication (block 1120). For example, as described above, the UE (e.g., using receive processor 258, controller / processor 280, memory 282, etc.) may receive a sounding reference signal configuration from a base station based at least in part on the indication.

[0128] Process 1100 may include additional aspects, such as any single aspect or any combination of aspects described below and / or in combination with one or more other processes described elsewhere herein.

[0129] In a first aspect, if the UE cannot support the maximum transmit power, an indication of whether the UE can use the virtual port to transmit uplink communications using the maximum transmit power is sent by setting the power scaling factor to 1 for all precoders supported by the UE.

[0130] In a second aspect, alone or in combination with the first aspect, the indication further indicates whether the UE can support a maximum transmit power using a precoder across non-coherent antenna ports.

[0131] In a third aspect, alone or in combination with one or more of the first and second aspects, the indication comprises two bits, and a first value of the two bits indicates that the UE is capable of using a predecoder across non-coherent antenna ports and does not use a virtual port to support the maximum transmit power, a second value of the two bits indicates that the UE is capable of using a virtual port and does not use a predecoder across non-coherent antenna ports to support the maximum transmit power, a third value of the two bits indicates that the UE is capable of using both a predecoder across non-coherent antenna ports and a virtual port to support the maximum transmit power, and a fourth value of the two bits indicates that the UE is not capable of using a predecoder across non-coherent antenna ports to support the maximum transmit power and is not capable of using a virtual port to support the maximum transmit power.

[0132] In a fourth aspect, either alone or in combination with one or more of the first to third aspects, the indication is for each frequency band-band combination supported by the UE, and / or the indication is sent for each frequency band in each frequency band-band combination supported by the UE.

[0133] In a fifth aspect, alone or in combination with one or more of the first to fourth aspects, the indication further indicates a number of virtual ports that the UE can use to transmit uplink communications using a maximum transmit power.

[0134] In the sixth aspect, alone or in combination with one or more of the first to fifth aspects, the first value of the indication indicates that the UE is not able to use a virtual port to send uplink communications using the maximum transmit power, and the second value of the indication indicates that the UE is able to use a single virtual port to send uplink communications using the maximum transmit power.

[0135] In a seventh aspect, alone or in combination with one or more of the first to sixth aspects, when the UE includes two transmit chains, the indication is a single bit.

[0136] In the eighth aspect, alone or in combination with one or more of the first to seventh aspects, the first value of the indication indicates that the UE cannot use a virtual port to send uplink communications using a maximum transmit power, the second value of the indication indicates that the UE can use at least one virtual port to send uplink communications using a maximum transmit power, and the third value of the indication indicates that the UE can use two virtual ports to send simultaneous uplink communications using the maximum transmit power on each of the two virtual ports.

[0137] In a ninth aspect, alone or in combination with one or more of the first to eighth aspects, when the UE includes four transmission chains, the indication is two bits.

[0138] In a tenth aspect, alone or in combination with one or more of the first to ninth aspects, the indication is sent in a field of a capability report, and when each transmit chain of the UE includes a power amplifier capable of supporting a maximum transmit power, the field is empty or excluded from the capability report.

[0139] In an eleventh aspect, alone or in combination with one or more of the first to tenth aspects, at least the number or type of sounding reference signal resources configured for a sounding reference signal resource set indicated in a sounding reference signal configuration is at least partially based on the indication.

[0140] In a twelfth aspect, alone or in combination with one or more of the first to eleventh aspects, two or more antenna ports are combined using at least one of precoding or cyclic delay diversity to synthesize a virtual port.

[0141] In a thirteenth aspect, alone or in combination with one or more of the first to twelfth aspects, two or more antenna ports are incoherent or partially coherent.

[0142] In a fourteenth aspect, alone or in combination with one or more of the first to thirteenth aspects, process 1100 can include sending uplink communications (eg, SRS, data communications, etc.) based at least in part on the SRS configuration.

[0143] In a fifteenth aspect, alone or in combination with one or more of the first to fourteenth aspects, process 1100 may include sending uplink communications using a virtual port.

[0144] In a sixteenth aspect, alone or in combination with one or more of the first to fifteenth aspects, uplink communications are transmitted using a maximum transmit power.

[0145] although Fig.11 An example block diagram of process 1100 is shown, but in some aspects, process 1100 may include Fig.11 Additional blocks, fewer blocks, different blocks, or differently arranged blocks than those depicted. Additionally or alternatively, two or more blocks of process 1100 may be performed in parallel.

[0146] Fig.12 is a diagram illustrating an example process 1200 performed, for example, by a UE, in accordance with aspects of the present disclosure. Example process 1200 is an example of operations in which a UE (eg, UE 120, etc.) performs signaling and operations associated with using a maximum transmit power of a virtual port.

[0147] like Fig.12 As shown, in some aspects, process 1200 may include sending a bitmap to a base station, the bitmap indicating a set of TPMIs that support a maximum transmit power for uplink communication according to a power class of the UE, wherein at least one TPMI in the set of TPMIs that support the maximum transmit power is not represented by any individual bit of the bitmap (block 1210). For example, as described above, a UE (e.g., using transmit processor 264, controller / processor 280, memory 282, etc.) may send a bitmap to a base station, the bitmap indicating a set of TPMIs that support a maximum transmit power for uplink communication according to a power class of the UE. In some aspects, at least one TPMI in the set of TPMIs that support the maximum transmit power is not represented by any individual bit of the bitmap.

[0148] like Fig.12As further shown in FIG. 1 , in some aspects, process 1200 may include transmitting uplink communications using a first TPMI included in the set of TPMIs and using a power allocation procedure associated with transmitting using the first TPMI (block 1220). For example, as described above, the UE (e.g., using transmit processor 264, controller / processor 280, memory 282, etc.) may transmit uplink communications using a first TPMI included in the set of TPMIs and using a power allocation procedure associated with transmitting using the first TPMI.

[0149] Process 1200 may include additional aspects, such as any single aspect or any combination of aspects described below and / or in combination with one or more other processes described elsewhere herein.

[0150] In a first aspect, the set of TPMIs supporting the maximum transmit power includes more TPMIs than a plurality of TPMIs explicitly indicated by the UE as supporting the maximum transmit power using a bitmap.

[0151] In a second aspect, alone or in combination with the first aspect, the at least one TPMI comprises a TPMI in which all transmit chains of the UE are used.

[0152] In a third aspect, alone or in combination with one or more of the first and second aspects, each bit in the bitmap corresponds to a single layer TPMI.

[0153] In a fourth aspect, alone or in combination with one or more of the first to third aspects, the at least one TPMI comprises a multi-layer TPMI.

[0154] In a fifth aspect, alone or in combination with one or more of the first to fourth aspects, when the UE includes four transmit chains and when corresponding connections between the transmit chains and transmit antennas are not reconfigurable, the length of the bitmap is 11 bits.

[0155] In a sixth aspect, alone or in combination with one or more of the first to fifth aspects, the first bit of the bitmap indicates that the maximum transmit power is supported using only the first transmit chain of the UE, the second bit of the bitmap indicates that the maximum transmit power is supported using only the second transmit chain of the UE, the third bit of the bitmap indicates that the maximum transmit power is supported using only the third transmit chain of the UE, the fourth bit of the bitmap indicates that the maximum transmit power is supported using only the fourth transmit chain of the UE, the fifth bit of the bitmap indicates that the maximum transmit power is supported using only the first transmit chain and the third transmit chain, the sixth bit of the bitmap indicates that the maximum transmit power is supported using only the second transmit chain and the fourth transmit chain, the seventh bit of the bitmap indicates that the maximum transmit power is supported using only the first transmit chain and the second transmit chain, the eighth bit of the bitmap indicates that the maximum transmit power is supported using only the first transmit chain and the fourth transmit chain, the ninth bit of the bitmap indicates that the maximum transmit power is supported using only the second transmit chain and the third transmit chain, the tenth bit of the bitmap indicates that the maximum transmit power is supported using only the third transmit chain and the fourth transmit chain, and the eleventh bit of the bitmap indicates that the maximum transmit power is supported using only the first transmit chain, the second transmit chain, and the third transmit chain.

[0156] In a seventh aspect, alone or in combination with one or more of the first to sixth aspects, the TPMI set indicated by the UE includes fewer TPMIs than all TPMIs supporting a maximum transmit power of the UE.

[0157] In an eighth aspect, alone or in combination with one or more of the first to seventh aspects, when the UE includes two transmit chains and when the corresponding connections between the transmit chains and the transmit antennas are not reconfigurable, the length of the bitmap is 2 bits.

[0158] In a ninth aspect, either alone or in combination with one or more of the first to eighth aspects, a first bit of the bitmap indicates that only a first transmission chain of the UE is used to support a maximum transmission power, and a second bit of the bitmap indicates that only a second transmission chain of the UE is used to support a maximum transmission power.

[0159] In the tenth aspect, either alone or in combination with one or more of the first to ninth aspects, if the UE has only two transmit chains and is capable of combining antenna ports to transmit uplink communications using a maximum transmit power, the UE is required to use only the first transmit chain of the UE to support the maximum transmit power.

[0160] In an eleventh aspect, alone or in combination with one or more of the first to tenth aspects, when the UE includes four transmit chains and when corresponding connections between the transmit chains and transmit antennas are reconfigurable, the length of the bitmap is 3 bits.

[0161] In the twelfth aspect, alone or in combination with one or more of the first to eleventh aspects, the first bit of the bitmap indicates that the maximum transmit power is supported using a single transmit chain of the UE, the second bit of the bitmap indicates that the maximum transmit power is supported using two transmit chains of the UE, and the third bit of the bitmap indicates that the maximum transmit power is supported using three transmit chains of the UE.

[0162] In a thirteenth aspect, alone or in combination with one or more of the first to twelfth aspects, the process 1200 includes sending an indication to a base station whether a connection between a transmit chain of the UE and a transmit antenna of the UE is reconfigurable.

[0163] In a fourteenth aspect, either alone or in combination with one or more of the first to thirteenth aspects, the power allocation process includes avoiding performing power scaling when transmitting using the first TPMI, or when transmitting using the first TPMI, adopting a different power allocation process than when transmitting using a TPMI not included in the TPMI set.

[0164] In a fifteenth aspect, alone or in combination with one or more of the first to fourteenth aspects, the process 1200 includes receiving an instruction to transmit using a maximum transmit power and a TPMI included in a TPMI set.

[0165] although Fig.12 An example block diagram of process 1200 is shown, but in some aspects, process 1200 may include Fig.12 The blocks depicted may include additional blocks, fewer blocks, different blocks, or differently arranged blocks than those depicted. Additionally or alternatively, two or more blocks of process 1200 may be performed in parallel.

[0166] Fig.13 is a diagram illustrating an example process 1300 performed, for example, by a base station, according to aspects of the present disclosure. Example process 1300 is an example of operations in which a base station (eg, base station 110, etc.) performs signaling and operations associated with using maximum transmit power for a virtual port.

[0167] like Fig.13 As shown, in some aspects, process 1300 may include receiving an indication from a UE whether the UE is capable of using a virtual port to transmit uplink communications using a maximum transmit power according to a power class of the UE, where the virtual port is a combination of two or more antenna ports (block 1310). For example, as described above, a base station (e.g., using receive processor 238, controller / processor 240, memory 242, etc.) may receive an indication from a UE whether the UE is capable of using a virtual port to transmit uplink communications using a maximum transmit power according to a power class of the UE. In some aspects, a virtual port is a combination of two or more antenna ports.

[0168] like Fig.13 As further shown, in some aspects, process 1300 may include sending a sounding reference signal configuration to the UE based at least in part on the indication (block 1320). For example, as described above, the base station (e.g., using transmit processor 220, controller / processor 240, memory 242, etc.) may send a sounding reference signal configuration to the UE based at least in part on the indication.

[0169] 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.

[0170] In a first aspect, if the UE cannot support the maximum transmit power, an indication of whether the UE can use a virtual port to transmit uplink communications using the maximum transmit power is received by setting a power scaling factor to 1 for all precoders supported by the UE.

[0171] In a second aspect, alone or in combination with the first aspect, the indication further indicates whether the UE can support a maximum transmit power using a precoder across non-coherent antenna ports.

[0172] In a third aspect, alone or in combination with one or more of the first and second aspects, the indication comprises two bits, and a first value of the two bits indicates that the UE is capable of using a predecoder across non-coherent antenna ports and not using a virtual port to support the maximum transmit power, a second value of the two bits indicates that the UE is capable of using a virtual port and not using a predecoder across non-coherent antenna ports to support the maximum transmit power, a third value of the two bits indicates that the UE is capable of using both a predecoder across non-coherent antenna ports and using a virtual port to support the maximum transmit power, and a fourth value of the two bits indicates that the UE is not capable of using a predecoder across non-coherent antenna ports to support the maximum transmit power and is not capable of using a virtual port to support the maximum transmit power.

[0173] In a fourth aspect, alone or in combination with one or more of the first to third aspects, the indication is for each frequency band-frequency band combination supported by the UE.

[0174] In a fifth aspect, alone or in combination with one or more of the first to fourth aspects, process 1300 includes receiving an indication of a number of virtual ports that the UE can use to transmit uplink communications using a maximum transmit power.

[0175] In the sixth aspect, alone or in combination with one or more of the first to fifth aspects, the first value of the indication indicates that the UE is not able to use a virtual port to send uplink communications using the maximum transmit power, and the second value of the indication indicates that the UE is able to use a single virtual port to send uplink communications using the maximum transmit power.

[0176] In a seventh aspect, alone or in combination with one or more of the first to sixth aspects, when the UE includes two transmit chains, the indication is a single bit.

[0177] In the eighth aspect, alone or in combination with one or more of the first to seventh aspects, the first value of the indication indicates that the UE is not capable of using a virtual port to send uplink communications using a maximum transmit power, the second value of the indication indicates that the UE is capable of using at least one virtual port to send uplink communications using a maximum transmit power, and the third value of the indication indicates that the UE is capable of using two virtual ports to send simultaneous uplink communications using the maximum transmit power on each of the two virtual ports.

[0178] In a ninth aspect, alone or in combination with one or more of the first to eighth aspects, when the UE includes four transmission chains, the indication is two bits.

[0179] In a tenth aspect, alone or in combination with one or more of the first to ninth aspects, the indication is received in a field of a capability report, and when each transmit chain of the UE includes a power amplifier capable of supporting a maximum transmit power, the field is empty or excluded from the capability report.

[0180] In an eleventh aspect, alone or in combination with one or more of the first to tenth aspects, at least the number or type of sounding reference signal resources configured for a sounding reference signal resource set indicated in a sounding reference signal configuration is based at least in part on the indication.

[0181] In a twelfth aspect, alone or in combination with one or more of the first to eleventh aspects, two or more antenna ports are combined using at least one of pre-coding or cyclic delay diversity to synthesize a virtual port.

[0182] In a thirteenth aspect, alone or in combination with one or more of the first to twelfth aspects, the two or more antenna ports are incoherent or partially coherent.

[0183] although Fig.13 An example block diagram of process 1300 is shown, but in some aspects, process 1300 may include Fig.13 The blocks depicted may include additional blocks, fewer blocks, different blocks, or differently arranged blocks than those depicted. Additionally or alternatively, two or more blocks of process 1300 may be performed in parallel.

[0184] Fig.14 is a diagram illustrating an example process 1400, performed, for example, by a base station, in accordance with aspects of the present disclosure. Example process 1400 is an example of operations in which a base station (eg, base station 110, etc.) performs signaling and operations associated with using maximum transmit power for a virtual port.

[0185] like Fig.14 As shown, in some aspects, process 1400 may include receiving a bitmap from a UE, the bitmap indicating a set of TPMIs that support a maximum transmit power for uplink communication according to a power class of the UE, wherein at least one TPMI in the set of TPMIs that support the maximum transmit power is not represented by any individual bit of the bitmap (block 1410). For example, as described above, a base station (e.g., using receive processor 238, controller / processor 240, memory 242, etc.) may receive a bitmap from a UE, the bitmap indicating a set of TPMIs that support a maximum transmit power for uplink communication according to a power class of the UE. In some aspects, at least one TPMI in the set of TPMIs that support the maximum transmit power is not represented by any individual bit of the bitmap.

[0186] like Fig.14 As further shown in FIG. 14 , in some aspects, process 1400 may include sending an instruction to the UE to transmit using the maximum transmit power and a TPMI included in the TPMI set (block 1420). For example, as described above, the base station (e.g., using transmit processor 220, controller / processor 240, memory 242, and / or the like) may send an instruction to the UE to transmit using the maximum transmit power and a TPMI included in the TPMI set.

[0187] Process 1400 may include additional aspects, such as any single aspect or any combination of aspects described below and / or in combination with one or more other processes described elsewhere herein.

[0188] In a first aspect, the set of TPMIs supporting the maximum transmit power includes more TPMIs than a plurality of TPMIs explicitly indicated by the UE as supporting the maximum transmit power using a bitmap.

[0189] In a second aspect, alone or in combination with the first aspect, the at least one TPMI comprises a TPMI in which all transmit chains of the UE are used.

[0190] In a third aspect, alone or in combination with one or more of the first and second aspects, each bit in the bitmap corresponds to a single layer TPMI.

[0191] In a fourth aspect, alone or in combination with one or more of the first to third aspects, the at least one TPMI comprises a multi-layer TPMI.

[0192] In a fifth aspect, alone or in combination with one or more of the first to fourth aspects, when the UE includes four transmit chains and when corresponding connections between the transmit chains and transmit antennas are not reconfigurable, the length of the bitmap is 11 bits.

[0193] In a sixth aspect, alone or in combination with one or more of the first to fifth aspects, the first bit of the bitmap indicates that the maximum transmit power is supported using only the first transmit chain of the UE, the second bit of the bitmap indicates that the maximum transmit power is supported using only the second transmit chain of the UE, the third bit of the bitmap indicates that the maximum transmit power is supported using only the third transmit chain of the UE, the fourth bit of the bitmap indicates that the maximum transmit power is supported using only the fourth transmit chain of the UE, the fifth bit of the bitmap indicates that the maximum transmit power is supported using only the first transmit chain and the third transmit chain, the sixth bit of the bitmap indicates that the maximum transmit power is supported using only the second transmit chain and the fourth transmit chain, the seventh bit of the bitmap indicates that the maximum transmit power is supported using only the first transmit chain and the second transmit chain, the eighth bit of the bitmap indicates that the maximum transmit power is supported using only the first transmit chain and the fourth transmit chain, the ninth bit of the bitmap indicates that the maximum transmit power is supported using only the second transmit chain and the third transmit chain, the tenth bit of the bitmap indicates that the maximum transmit power is supported using only the third transmit chain and the fourth transmit chain, and the eleventh bit of the bitmap indicates that the maximum transmit power is supported using only the first transmit chain, the second transmit chain, and the third transmit chain.

[0194] In a seventh aspect, alone or in combination with one or more of the first to sixth aspects, the TPMI set indicated by the UE includes fewer TPMIs than all TPMIs supporting a maximum transmit power of the UE.

[0195] In an eighth aspect, alone or in combination with one or more of the first to seventh aspects, when the UE includes two transmit chains and when the corresponding connections between the transmit chains and the transmit antennas are not reconfigurable, the length of the bitmap is 2 bits.

[0196] In a ninth aspect, either alone or in combination with one or more of the first to eighth aspects, a first bit of the bitmap indicates that only a first transmission chain of the UE is used to support a maximum transmission power, and a second bit of the bitmap indicates that only a second transmission chain of the UE is used to support a maximum transmission power.

[0197] In the tenth aspect, either alone or in combination with one or more of the first to ninth aspects, if the UE has only two transmit chains and is capable of combining antenna ports to transmit uplink communications using a maximum transmit power, the UE is required to use only the first transmit chain of the UE to support the maximum transmit power.

[0198] In an eleventh aspect, alone or in combination with one or more of the first to tenth aspects, when the UE includes four transmit chains and when corresponding connections between the transmit chains and transmit antennas are reconfigurable, the length of the bitmap is 3 bits.

[0199] In the twelfth aspect, alone or in combination with one or more of the first to eleventh aspects, the first bit of the bitmap indicates that the maximum transmit power is supported using a single transmit chain of the UE, the second bit of the bitmap indicates that the maximum transmit power is supported using two transmit chains of the UE, and the third bit of the bitmap indicates that the maximum transmit power is supported using three transmit chains of the UE.

[0200] In a thirteenth aspect, alone or in combination with one or more of the first to twelfth aspects, the process 1400 includes receiving an indication from the UE whether a connection between a transmit chain of the UE and a transmit antenna of the UE is reconfigurable.

[0201] although Fig.14 An example block diagram of process 1400 is shown, but in some aspects, process 1400 may include Fig.14 The blocks depicted may include additional blocks, fewer blocks, different blocks, or differently arranged blocks than those depicted. Additionally or alternatively, two or more blocks of process 1400 may be performed in parallel.

[0202] 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.

[0203] 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 in hardware, firmware, and / or a combination of hardware and software.

[0204] 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.

[0205] It will be apparent that the systems and / or methods described herein may be implemented in various forms of hardware, firmware, and / or combinations of hardware and software. The actual dedicated control hardware or software code used to implement these systems and / or methods is not limited in these respects. Therefore, the operation and behavior of the systems and / or methods are described herein without reference to specific software code—it should be understood that software and hardware can be designed to implement the systems and / or methods based at least in part on the description herein.

[0206] Although 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 specifically disclosed in the specification. Although each dependent claim listed below can be directly subordinate to only one claim, the disclosure of various aspects includes that each dependent claim is combined with each other claim in the claim set. The phrase "at least one" mentioned in the list of items refers to any combination of those items, including single members. For example, "at least one of a, b or c" is intended to cover a, b, c, ab, ac, bc and abc, and any combination with multiples of the same elements (for example, aa, aaa, aab, aac, abb, acc, bb, bbb, bbc, cc and ccc, or any other ordering of a, b and c).

[0207] Unless explicitly described as such, the elements, actions or instructions used herein should not be interpreted as critical or essential. In addition, as used herein, the articles "a" 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 meant, the phrase "only one" or similar language is used. In addition, as used herein, the terms "has", "have", "having" etc. are open terms. In addition, the phrase "based on" is intended to represent "based at least in part on", unless otherwise explicitly stated.

Claims

1. A user equipment UE for wireless communication, comprising: Memory; and One or more processors coupled to the memory, configured to: sending a bitmap associated with a subset of a set of transmit precoding matrix indicators TPMIs to a network node, wherein each TPMI in the set of TPMIs supports a maximum transmit power for uplink communications according to a power class of the UE, and wherein at least one TPMI in the set of TPMIs supporting the maximum transmit power is not represented by any individual bit of the bitmap; as well as An uplink communication is transmitted using a first TPMI included in the set of TPMIs and using a power allocation procedure associated with transmission using the first TPMI. 2 . The UE according to claim 1 , wherein when the UE includes two transmission chains, the length of the bitmap is 2 bits. 3 . The UE of claim 1 , wherein when the UE includes two transmit chains and when corresponding connections between transmit chains and transmit antennas are not reconfigurable, the length of the bitmap is 2 bits. 4 . The UE of claim 1 , wherein the at least one TPMI comprises a TPMI in which all transmission chains of the UE are used. The UE according to claim 1 , wherein each bit in the bitmap corresponds to a single-layer TPMI. The UE of claim 1 , wherein the at least one TPMI comprises a multi-layer TPMI. 7 . The UE of claim 1 , wherein when the UE includes four transmit chains and when corresponding connections between transmit chains and transmit antennas are not reconfigurable, the length of the bitmap is 11 bits. 8 . The UE of claim 1 , wherein the TPMI set indicated by the UE includes fewer TPMIs than all TPMIs that support the maximum transmit power of the UE.

9. The UE of claim 1, wherein if the UE has only two transmit chains and is capable of combining antenna ports to transmit uplink communications using the maximum transmit power, the UE is required to use only a first transmit chain of the UE to support the maximum transmit power.

10. The UE of claim 1, wherein when the UE includes four transmit chains and when corresponding connections between transmit chains and transmit antennas are reconfigurable, the length of the bitmap is 3 bits.

11. The UE of claim 1 , wherein the one or more processors are further configured to send an indication to the network node of whether a connection between a transmit chain of the UE and a transmit antenna of the UE is reconfigurable.

12. A wireless communication method performed by a user equipment UE, comprising: sending a bitmap associated with a subset of a set of transmit precoding matrix indicators TPMIs to a network node, wherein each TPMI in the set of TPMIs supports a maximum transmit power for uplink communications according to a power class of the UE, and wherein at least one TPMI in the set of TPMIs supporting the maximum transmit power is not represented by any individual bit of the bitmap; as well as An uplink communication is transmitted using a first TPMI included in the set of TPMIs and using a power allocation procedure associated with transmission using the first TPMI. 13 . The method according to claim 12 , wherein when the UE includes two transmission chains, the length of the bitmap is 2 bits.

14. The method of claim 12, wherein when the UE includes two transmit chains and when corresponding connections between transmit chains and transmit antennas are not reconfigurable, the length of the bitmap is 2 bits.

15. The method of claim 12, wherein the at least one TPMI comprises a TPMI in which all transmit chains of the UE are used.

16. The method of claim 12, wherein each bit in the bitmap corresponds to a single layer of TPMI.

17. The method of claim 12, wherein the at least one TPMI comprises a multi-layer TPMI.

18. The method of claim 12, wherein when the UE includes four transmit chains and when corresponding connections between transmit chains and transmit antennas are not reconfigurable, the length of the bitmap is 11 bits.

19. The method of claim 12, wherein the set of TPMIs indicated by the UE includes fewer TPMIs than all TPMIs that support the maximum transmit power of the UE.

20. The method of claim 12, wherein if the UE has only two transmit chains and is capable of combining antenna ports to transmit uplink communications using the maximum transmit power, the UE is required to use only a first transmit chain of the UE to support the maximum transmit power.

21. The method of claim 12, wherein when the UE includes four transmit chains and when corresponding connections between transmit chains and transmit antennas are reconfigurable, the length of the bitmap is 3 bits.

22. The method of claim 12, further comprising sending an indication to the network node whether a connection between a transmit chain of the UE and a transmit antenna of the UE is reconfigurable.

23. A network node for wireless communication, comprising: Memory; and One or more processors coupled to the memory, configured to: receiving, from a user equipment (UE), a bitmap associated with a subset of a set of transmit precoding matrix indicators (TPMIs), wherein each TPMI in the set of TPMIs supports a maximum transmit power for uplink communications according to a power class of the UE, and wherein at least one TPMI in the set of TPMIs supporting the maximum transmit power is not represented by any individual bit of the bitmap; as well as An instruction is sent to the UE to transmit using the maximum transmit power and the TPMI included in the TPMI set.

24. The network node of claim 23, wherein the set of TPMIs supporting the maximum transmit power includes more TPMIs than the number of TPMIs explicitly indicated by the UE using the bitmap as supporting the maximum transmit power.

25. The network node of claim 23, wherein the at least one TPMI comprises a TPMI in which all transmit chains of the UE are used.

26. The network node of claim 23, wherein each bit in the bitmap corresponds to a single layer of TPMI.

27. A wireless communication method performed by a network node, comprising: receiving, from a user equipment (UE), a bitmap associated with a subset of a set of transmit precoding matrix indicators (TPMIs), wherein each TPMI in the set of TPMIs supports a maximum transmit power for uplink communications according to a power class of the UE, and wherein at least one TPMI in the set of TPMIs supporting the maximum transmit power is not represented by any individual bit of the bitmap; as well as An instruction is sent to the UE to transmit using the maximum transmit power and the TPMI included in the TPMI set.

28. The network node of claim 27, wherein the set of TPMIs supporting the maximum transmit power includes more TPMIs than the number of TPMIs explicitly indicated by the UE using the bitmap as supporting the maximum transmit power.

29. The network node of claim 27, wherein the at least one TPMI comprises a TPMI in which all transmit chains of the UE are used.

30. The network node of claim 27, wherein each bit in the bitmap corresponds to a single layer of TPMI.

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