Maximum transmit power signaling and configuration using virtual ports

Abstract

Aspects of the present disclosure generally relate to wireless communications. In some aspects, a user equipment (UE) may transmit to a base station an indication of whether the UE can use a virtual port to transmit uplink communications using a maximum transmit power according to a power class of the UE. The virtual port may be a combination of one or more antenna ports. The indication may be based at least in part on an operating mode of the UE. The UE may receive a sounding reference signal configuration from the base station based at least in part on the indication. Many other aspects are provided.

Description

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This patent application claims priority to U.S. Provisional Patent Application No. 62 / 937,641, filed on November 19, 2019, entitled “SIGNALING AND CONFIGURATION OF MAXIMUM TRANSMIT POWER USING VIRTUAL PORTS,” and filed on October 7, 2020, entitled “SIGNALING AND CONFIGURATION OF MAXIMUM TRANSMIT POWER USING VIRTUALPORTS,” which are hereby expressly incorporated herein by reference. Technical Field

[0003] Aspects of the present disclosure relate generally to wireless communications and, more particularly, to techniques and apparatus for signaling and configuration of maximum transmit power using virtual ports. Background Art

[0004] Wireless communication systems are widely deployed to provide various telecommunication services such as telephony, video, data, messaging, and broadcasting. Typical wireless communication systems may employ multiple access technologies that can support communication with multiple users by sharing available system resources (e.g., bandwidth, transmit power, etc.). Examples of such multiple access technologies include code division multiple access (CDMA) systems, time division multiple access (TDMA) systems, frequency division multiple access (FDMA) systems, orthogonal frequency division multiple access (OFDMA) systems, single carrier frequency division multiple access (SC-FDMA) systems, time division synchronous code division multiple access (TD-SCDMA) systems, and long term evolution (LTE). LTE / LTE-Advanced is a set of enhancements to the Universal Mobile Telecommunications System (UMTS) mobile standard promulgated by the Third Generation Partnership Project (3GPP).

[0005] A wireless communication network may include several base stations (BS) that can support communication of several 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, a gNB, an Access Point (AP), a Radio Head, a Transmit Receive Point (TRP), a New Radio (NR) BS, a 5G Node B, and the like.

[0006] The above multiple access technologies have been adopted in various telecommunication standards to provide common protocols that enable different user equipment to communicate at city, country, region, and even global levels. New Radio (NR) (which may also be referred to as 5G) is an enhancement set to the LTE mobile standard promulgated by the Third Generation Partnership Project (3GPP). NR is designed to better support mobile broadband Internet access by improving spectrum efficiency, reducing costs, improving services, utilizing new spectrum, and using orthogonal frequency division multiplexing (OFDM) (CP-OFDM) with cyclic prefix (CP) on the downlink (DL), using CP-OFDM and / or SC-FDM (e.g., also referred to as discrete Fourier transform spread OFDM (DFT-s-OFDM)) on the uplink (UL), and supporting beamforming, multiple input multiple output (MIMO) antenna technology and carrier aggregation to better integrate with other open standards. However, as the demand for mobile broadband access continues to grow, there is a need for further improvements in LTE and NR technologies. Preferably, these improvements should be applicable to other multiple access technologies and telecommunication standards that employ these technologies. Summary of the invention

[0007] In some aspects, a wireless communication method performed by a user equipment (UE) includes: transmitting to a base station an indication of whether the UE can use a virtual port to transmit uplink communications using a maximum transmit power according to a power class of the UE, wherein the virtual port is a combination of one or more antenna ports, and wherein the indication is based at least in part on an operating mode of the UE; and receiving a sounding reference signal configuration from the base station based at least in part on the indication.

[0008] In some aspects, a wireless communication method performed by a base station includes: receiving an indication from a UE as to whether the UE is able to use a virtual port to transmit uplink communications using a maximum transmit power according to a power class of the UE, wherein the virtual port is a combination of one or more antenna ports, and wherein the indication is based at least in part on an operating mode of the UE; and transmitting a sounding reference signal configuration to the UE based at least in part on the indication.

[0009] In some aspects, a UE for wireless communication includes: a memory; and one or more processors operatively coupled to the memory, the memory and the one or more processors being configured to: transmit to a base station an indication of whether the UE is able to use a virtual port to transmit uplink communications using a maximum transmit power according to a power class of the UE, wherein the virtual port is a combination of one or more antenna ports, and wherein the indication is based at least in part on an operating mode of the UE; and receive a sounding reference signal configuration from the base station based at least in part on the indication.

[0010] In some aspects, a base station for wireless communication includes: a memory; and one or more processors operatively coupled to the memory, the memory and the one or more processors being configured to: receive an indication from a UE as to whether the UE is able to use a virtual port to transmit uplink communications using a maximum transmit power according to a power class of the UE, wherein the virtual port is a combination of one or more antenna ports, and wherein the indication is based at least in part on an operating mode of the UE; and transmit a sounding reference signal configuration to the UE based at least in part on the indication.

[0011] In some aspects, a non-transitory computer-readable medium storing a set of instructions for wireless communication includes one or more instructions that, when executed by one or more processors of a UE, cause the UE to: transmit an indication to a base station regarding whether the UE is able to use a virtual port to transmit uplink communications using a maximum transmit power based on a power class of the UE, wherein the virtual port is a combination of one or more antenna ports, and wherein the indication is based at least in part on an operating mode of the UE; and receive a sounding reference signal configuration from the base station based at least in part on the indication.

[0012] In some aspects, a non-transitory computer-readable medium storing a set of instructions for wireless communication includes one or more instructions that, when executed by one or more processors of a base station, cause the base station to: receive an indication from a UE as to whether the UE is able to use a virtual port to transmit uplink communications using a maximum transmit power according to a power class of the UE, wherein the virtual port is a combination of one or more antenna ports, and wherein the indication is based at least in part on an operating mode of the UE; and transmit a sounding reference signal configuration to the UE based at least in part on the indication.

[0013] In some aspects, an apparatus for wireless communications includes: a device for transmitting an indication to a base station as to whether the UE is able to use a virtual port to transmit uplink communications using a maximum transmit power according to a power class of the UE, wherein the virtual port is a combination of one or more antenna ports, and wherein the indication is based at least in part on an operating mode of the UE; and a device for receiving a sounding reference signal configuration from the base station based at least in part on the indication.

[0014] In some aspects, an apparatus for wireless communications includes: a device for receiving an indication from a UE as to whether the UE is able to use a virtual port to transmit uplink communications using a maximum transmit power according to a power class of the UE, wherein the virtual port is a combination of one or more antenna ports, and wherein the indication is based at least in part on an operating mode of the UE; and a device for transmitting a sounding reference signal configuration to the UE based at least in part on the indication.

[0015] 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 substantially described herein with reference to and as illustrated in the accompanying drawings and specification.

[0016] The foregoing has broadly outlined the features and technical advantages of examples according to the present disclosure in an effort to make the following detailed description better understood. Additional features and advantages will be described hereinafter. The disclosed concepts and specific examples can be easily used as a basis for modifying or designing other structures for implementing the same purpose as the present disclosure. Such equivalent constructions do not depart from the scope of the appended claims. The characteristics of the concepts disclosed herein, both in terms of their organization and method of operation, and the associated advantages will be better understood by considering the following description in conjunction with the accompanying drawings. Each of the accompanying drawings is provided for the purpose of illustration and description and is not intended to define limitations on the claims. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to understand the above-stated features of the present disclosure in detail, the above briefly summarized content may be described in more detail with reference to various aspects, some of which are illustrated in the accompanying drawings. However, it should be noted that the accompanying drawings only illustrate certain typical aspects of the present disclosure and should not be considered to limit its scope, as the description may allow for other equally effective aspects. The same reference numerals in different drawings may identify the same or similar elements.

[0018] Figure 1 is a block diagram illustrating an example of a wireless communication network in accordance with various aspects of the present disclosure.

[0019] Figure 2 is a block diagram illustrating an example of a base station and a UE in communication in a wireless communication network according to various aspects of the present disclosure.

[0020] Figure 3 is a diagram illustrating an example of forming a virtual port by combining incoherent and / or partially coherent antenna ports according to various aspects of the present disclosure.

[0021] Figure 4 is a diagram illustrating an example of sounding reference signal resource sets according to various aspects of the present disclosure.

[0022] Figure 5A and Figure 5B is a simplified diagram illustrating an example of a UE hardware architecture that supports maximum transmit power using virtual ports in accordance with various aspects of the present disclosure.

[0023] Figures 6 to 10 is a simplified diagram illustrating an example of maximum transmit power signaling and configuration using virtual ports in accordance with various aspects of the present disclosure.

[0024] Figures 11 to 16 is a simplified diagram illustrating example procedures associated with maximum transmit power signaling and configuration using virtual ports in accordance with various aspects of the present disclosure. DETAILED DESCRIPTION

[0025] The various aspects of the present disclosure are described more fully below with reference to the accompanying drawings. However, the present disclosure can be implemented in many different forms and should not be interpreted as being limited to any specific structure or function given throughout the present disclosure. On the contrary, these aspects are provided to make the present disclosure thorough and complete, and it will fully convey the scope of the present disclosure to those skilled in the art. Based on the teachings herein, those skilled in the art will appreciate that the scope of the present disclosure is intended to cover any aspect of the present disclosure disclosed herein, whether it is implemented independently or 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 devices or methods practiced using supplements or other other structures, functionality, or structures and functionality as the various aspects of the present disclosure set forth herein. It should be understood that any aspect of the present disclosure disclosed herein can be implemented by one or more elements of the claims.

[0026] Several aspects of telecommunication systems will now be presented with reference to various devices and techniques. These devices and techniques will be described in the following detailed description and illustrated in the accompanying drawings by various blocks, modules, components, circuits, steps, processes, algorithms, etc. (collectively referred to as "elements"). These elements can be implemented using hardware, software, or a combination thereof. Whether such elements are implemented as hardware or software depends on the specific application and the design constraints imposed on the overall system.

[0027] It should be noted that although various aspects may be described herein using terminology typically associated with 3G and / or 4G wireless technologies, various aspects of the present disclosure may be applied in communication systems based on other generations, such as 5G and later generations, including NR technologies.

[0028] Figure 11 is a diagram illustrating a wireless network 100 in which various aspects of the present disclosure may be practiced. The wireless network 100 may be an LTE network or some other wireless network, such as a 5G or NR network. The wireless network 100 may include several BSs 110 (shown as BS 110a, BS 110b, BS 110c, and BS 110d) and other network entities. A BS is an entity that communicates with a user equipment (UE) and may also be referred to as a base station, NR BS, B node, gNB, 5G B node (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.

[0029] A BS may provide communication coverage for a macro cell, a pico cell, a femto cell, and / or another type of cell. A macro cell may cover a relatively large geographic area (e.g., several kilometers in radius) and may allow unrestricted access by UEs with service subscriptions. A pico cell may cover a relatively small geographic area and may allow unrestricted access by UEs with service subscriptions. A femto cell may cover a relatively small geographic area (e.g., a residence) and may allow restricted access by UEs associated with the femto cell (e.g., UEs in a closed subscriber group (CSG)). A BS for a macro cell may be referred to as a macro BS. A BS for a pico cell may be referred to as a pico BS. A BS for a femto cell may be referred to as a femto BS or a home BS. In Figure 1 In the example shown in , BS 110a may be a macro BS for macro cell 102a, BS 110b may be a pico BS for pico cell 102b, and BS 110c may be a femto BS for femto cell 102c. The BS may support one or more (e.g., three) cells. The terms "eNB", "base station", "NR BS", "gNB", "TRP", "AP", "B node", "5G NB", and "cell" may be used interchangeably herein.

[0030] In some aspects, the cells may not necessarily be stationary, and the geographic area of ​​the cells may move depending on the location of the mobile BS. In some aspects, the BSs may be interconnected to each other and / or to one or more other BSs or network nodes (not shown) in the wireless network 100 via various types of backhaul interfaces, such as direct physical connections, virtual networks, and / or the like using any suitable transport network.

[0031] The wireless network 100 may also include a relay station. A relay station is an entity that can receive transmissions of data from an upstream station (e.g., a BS or a UE) and send transmissions of the data to a downstream station (e.g., a UE or a BS). A relay station may also be a UE that can relay transmissions for other UEs. Figure 1 In the example shown in , a relay station 110d may communicate with a macro BS 110a and a UE 120d to facilitate communication between the BS 110a and the UE 120d. A relay station may also be referred to as a relay BS, a relay base station, a relay, or the like.

[0032] The wireless network 100 may be a heterogeneous network including different types of BSs (e.g., macro BSs, pico BSs, femto BSs, relay BSs, etc.). These different types of BSs may have different transmit power levels, different coverage areas, and different 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).

[0033] A network controller 130 may be coupled to a set of BSs and may provide coordination and control of these BSs. The network controller 130 may communicate with each BS via a backhaul. The BSs may also communicate with each other directly or indirectly, for example, via a wireless or wired backhaul.

[0034] UEs 120 (e.g., 120a, 120b, 120c) may be dispersed throughout the wireless network 100, and each UE may be stationary or mobile. UEs may also be referred to as access terminals, terminals, mobile stations, subscriber units, stations, etc. A UE may 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 biometric sensor / 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 equipment, a global positioning system device, or any other suitable device configured to communicate via a wireless or wired medium.

[0035] Some UEs may be considered as machine type communication (MTC) UEs, or evolved or enhanced machine type communication (eMTC) UEs. MTC and eMTC UEs include, for example, robots, drones, remote devices, sensors, meters, monitors, location tags, etc., which may communicate with a base station, another device (e.g., a remote device), or some other entity. A wireless node may provide connectivity to or to a network (e.g., a wide area network (such as the Internet) or a cellular network), for example, via a wired or wireless communication link. Some UEs may be considered as Internet of Things (IoT) devices, and / or may be implemented as NB-IoT (narrowband Internet of Things) devices. Some UEs may be considered as client equipment (CPE). UE 120 may be included inside a housing that houses components of UE 120, such as a processor component, a memory component, and the like.

[0036] In general, any number of wireless networks may be deployed in a given geographic area. Each wireless network may support a specific RAT and may operate on one or more frequencies. RAT may also be referred to as radio technology, air interface, etc. Frequency may also be referred to as carrier, frequency channel, etc. Each frequency may support a single RAT in a given geographic area to avoid interference between wireless networks of different RATs. In some cases, NR or 5G RAT networks may be deployed.

[0037] 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 to communicate 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.

[0038] As indicated above, Figure 1 are provided as examples. Other examples may differ from those described in Figure 1 Examples described.

[0039] Figure 2 A block diagram of a design 200 of a base station 110 and a UE 120 is shown, which may be Figure 1One for each base station and one for each UE in the base station 110. 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.

[0040] At the base station 110, the transmit processor 220 may receive data for one or more UEs from the data source 212, select one or more modulation and coding schemes (MCS) for each UE based at least in part on a channel quality indicator (CQI) received from the UE, process (e.g., encode and modulate) the data for each UE based at least in part on the MCS selected for the UE, and provide data symbols for all UEs. The transmit processor 220 may also process system information (e.g., for semi-static resource partitioning information (SRPI), etc.) and control information (e.g., CQI requests, grants, upper layer signaling, etc.), and provide overhead symbols and control symbols. The transmit processor 220 may also generate reference symbols for reference signals (e.g., cell-specific reference signals (CRS)) and synchronization signals (e.g., primary synchronization signals (PSS) and secondary synchronization signals (SSS)). The transmit (TX) multiple-input multiple-output (MIMO) processor 230 may perform spatial processing (e.g., precoding) on ​​data symbols, control symbols, overhead symbols, and / or reference symbols, where applicable, and may provide T output symbol streams to T modulators (MOD) 232a to 232t. Each modulator 232 may process a respective output symbol stream (e.g., for OFDM, etc.) to obtain an output sample stream. Each modulator 232 may further process (e.g., convert to analog, amplify, filter, and 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.

[0041] 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 where applicable, and provide detected symbols. A receive processor 258 may process (e.g., demodulate and decode) the detected symbols, provide decoded data for UE 120 to a data sink 260, and provide decoded control information and system information to a controller / processor 280. The channel processor may determine reference signal received power (RSRP), received signal strength indicator (RSSI), reference signal received quality (RSRQ), channel quality indicator (CQI), etc. In some aspects, one or more components of UE 120 may be included in a housing.

[0042] On the uplink, at the UE 120, a transmit processor 264 may receive and process data from a data source 262 and control information from a controller / processor 280 (e.g., for reports including RSRP, RSSI, RSRQ, CQI, etc.). The transmit processor 264 may also generate reference symbols for one or more reference signals. The symbols from the transmit processor 264 may be precoded by a TX MIMO processor 266, if applicable, further processed by modulators 254a through 254r (e.g., for DFT-s-OFDM, CP-OFDM, etc.), and transmitted to the base station 110. At the base station 110, uplink signals from the UE 120 as well as other UEs may be received by the antenna 234, processed by the demodulator 232, detected by the MIMO detector 236, if applicable, and further processed by the receive processor 238 to obtain decoded data and control information sent by the UE 120. The receive processor 238 may provide decoded data to a data sink 239 and provide decoded control information to a 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.

[0043] The controller / processor 240 of the base station 110, the controller / processor 280 of the UE 120, and / or Figure 2Any other component(s) of the base station 110 may perform one or more techniques associated with signaling and configuration of 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 of the Fig.11 Process 1100, Fig.12 The process 1200 Fig.13 Process 1300, Fig.14 The process of 1400 Fig.15 The process of 1500 Fig.16 1600, and / or operations of other processes as described herein. Memories 242 and 282 may store data and program codes for base station 110 and UE 120, respectively. In some aspects, memory 242 and / or memory 282 may include: a non-transitory computer-readable medium storing one or more instructions for wireless communication. For example, the one or more instructions, when executed by one or more processors of base station 110 and / or UE 120, may perform or direct, for example, Fig.11 Process 1100, Fig.12 The process 1200 Fig.13 Process 1300, Fig.14 The process of 1400 Fig.15 The process of 1500 Fig.16 The scheduler 246 may schedule UEs for data transmission on the downlink and / or uplink.

[0044] In some aspects, the UE includes: means for transmitting to a base station an indication of whether the UE is capable of transmitting uplink communications using a virtual port using a maximum transmit power according to a power class of the UE, wherein the virtual port is a combination of one or more antenna ports, and wherein the indication is based at least in part on an operating mode of the UE; and / or means for receiving a sounding reference signal configuration from the base station based at least in part on the indication. The UE means for performing the operations described herein may include, for example, antennas 252, demodulators 254, MIMO detectors 256, receive processors 258, transmit processors 264, TX MIMO processors 266, modulators 254, controllers / processors 280, and / or memory 282.

[0045] In some aspects, the base station includes: a device for receiving an indication from a UE as to whether the UE can use a virtual port to transmit uplink communications using a maximum transmit power according to a power class of the UE, wherein the virtual port is a combination of one or more antenna ports, and wherein the indication is based at least in part on an operating mode of the UE; and / or a device for transmitting a sounding reference signal configuration to the UE based at least in part on the indication. The base station's means for performing the operations described herein may include, for example, a transmit processor 220, a TX MIMO processor 230, a modulator 232, an antenna 234, a demodulator 232, a MIMO detector 236, a receive processor 238, a controller / processor 240, a memory 242, and / or a scheduler 246.

[0046] As indicated above, Figure 2 are provided as examples. Other examples may differ from those described in Figure 2 Examples described.

[0047] Figure 3 is a diagram illustrating an example 300 of forming a virtual port by combining incoherent and / or partially coherent antenna ports in accordance with various aspects of the present disclosure.

[0048] A multi-antenna UE 120 and / or a set of antenna ports of UE 120 may be classified into one of three groups depending on the coherence of the antenna ports of UE 120. A set of antenna ports (e.g., two antenna ports) is coherent if the relative phase between the antenna ports (e.g., between two antenna ports) remains the same between the time of a sounding reference signal (SRS) transmission from those antenna ports and the time of a subsequent physical uplink shared channel (PUSCH) transmission from those antenna ports. When this is the case, the SRS may be used (e.g., by UE 120 and / or base station 110) to determine an uplink precoder for precoding a PUSCH transmission, since the relative phase of the antenna ports will be the same for both SRS transmissions and PUSCH transmissions. In this case, precoding can span coherent antenna port sets (sometimes referred to herein as coherent ports). If the set of antenna ports is incoherent (ie, non-coherent), such uplink precoder determination becomes difficult because the relative phases of the antenna ports will change from SRS transmission to PUSCH transmission.

[0049] For example, if the relative phase between the antenna port set is different for SRS transmission and PUSCH transmission, the antenna port set is considered to be incoherent. In this case, precoding does not span the incoherent antenna port set (sometimes referred to as incoherent ports). In addition, if the first subset of the antenna port set is coherent with each other and the second subset of the antenna port set is coherent with each other, but the first antenna port subset and the second antenna port subset are incoherent with each other, the antenna port set is considered to be partially coherent. In this case, common precoding can be used within a subset of coherent ports, but not across a subset of incoherent ports. However, certain techniques can be applied to synthesize virtual antenna ports (sometimes referred to as virtual ports in this article) from antenna ports that lack coherence (for example, so that common precoding can be used on virtual ports and applied to incoherent antenna ports).

[0050] For example, as shown in reference numeral 305, precoding (e.g., uplink precoding) and cyclic delay diversity can be used to combine a set of non-coherent antenna ports (e.g., shown as two non-coherent antenna ports) into a single virtual port. The precoder can be determined by the UE 120 and / or signaled by the base station 110. "Cyclic delay diversity" (CDD) can refer to a technique that introduces a delay (e.g., cyclic delay) on one non-coherent port but not on other non-coherent ports. The delay can be measured by samples (e.g., 5 samples, 10 samples, etc.), sample parts, etc. For example, a first non-coherent port can transmit a first sample stream, and a second non-coherent port can transmit a second sample stream (e.g., which can 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 transmitted per codeword, a first non-coherent port may transmit 16 samples, the first of which transmits the first sample (e.g., [s1, s2, s3, s4, …, s16]), and a second non-coherent port may transmit 16 samples, the sixth of which transmits the first sample (e.g., with a delay of five samples) (e.g., [s12, s13, s14, s15, s16, s1, s2, s3, …, s11]).

[0051] Additionally or alternatively, as indicated by reference numeral 310, precoding (e.g., uplink precoding) and cyclic delay diversity may be used in a similar manner as described above to combine a set of partially coherent antenna ports (sometimes referred to herein as partially coherent ports) into a single virtual port. As shown, a first subset of ports may be coherent with each other, and a second subset of ports may be coherent with each other, but the two subsets may be incoherent with each other. As further shown, precoding may be applied to the individual subsets to generate a first virtual port and a second virtual port that are incoherent with each other. CDD may then be applied to the two virtual ports (e.g., by using CDD to transmit communications from the virtual ports), thereby forming a single virtual port from the partially coherent ports (e.g., using precoding and CDD).

[0052] When UE 120 is configured with multiple SRS ports for multiple-input multiple-output (MIMO) mode, UE 120 may be required to split the transmit power equally across all antenna ports used for PUSCH transmission using a power scaling factor. 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 is required to split the transmit power equally across all antenna ports on which the UE is configured to transmit PUSCH communications. For example, as shown by 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 precoding, the transmit power of the transmission on the single port (port 0) is scaled by a factor of 1 / 2 (half).

[0053] In some cases, base station 110 may need to instruct UE 120 to transmit at maximum power, such as when UE 120 is located near a cell edge or otherwise has poor link quality with base station 110. However, different UEs 120 may have different capabilities regarding virtual port synthesis and which virtual ports of UE 120 are capable of supporting maximum transmit power. For example, UE 120 may or may not be able to synthesize virtual ports that support a maximum transmit power (e.g., of the power class of UE 120) and / or may only be able to support a maximum transmit power of virtual ports that is a combination of a particular set of actual antenna ports of UE 120, depending on hardware components of UE 120, the number of transmit antennas of UE 120, the number of transmit chains of UE 120, the maximum transmit powers supported by different power amplifiers and / or different combinations of power amplifiers of UE 120, and so on.

[0054] In order for the base station 110 to instruct the UE 120 about the precoder to be used to transmit at maximum power (e.g., corresponding to the transmitted precoding matrix indicator (TPMI)), the base station 110 needs to know which precoder(s) of the UE 120 can support transmitting at maximum power. However, the base station 110 may not have information about such capabilities of the UE 120, which may result in instructions to transmit at maximum power using a precoder that the UE 120 is not capable of transmitting at maximum power. Some techniques and apparatus described herein permit the UE 120 to signal the capabilities of the UE 120 regarding the virtual ports of the UE 120 that support maximum transmit power, the precoders (e.g., TPMI) that support 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 the virtual ports and / or precoders that support maximum transmit power. In addition, despite the power scaling requirements described above, some techniques and apparatus described herein permit the UE 120 to transmit at maximum transmit power using the virtual ports.

[0055] although Figure 3 Antenna port pairs are shown in sets and subsets, but in some aspects, different numbers of antenna ports may be included in a set or subset. For example, an antenna port set or antenna port subset may include three antenna ports, four antenna ports, etc.

[0056] As indicated above, Figure 3 are provided as examples. Other examples may differ from those described in Figure 3 Examples described.

[0057] Figure 4 is a diagram illustrating an example 400 of sounding reference signal (SRS) resource sets in accordance with various aspects of the present disclosure.

[0058] The base station 110 may configure the UE 120 with one or more SRS resource sets to allocate resources for SRS transmission by 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.).

[0059] As indicated by reference numeral 410, the SRS resources may include one or more antenna ports (e.g., in time-frequency resources) over which the SRS is to be transmitted. Thus, the configuration for an SRS resource set may indicate one or more time-frequency resources in which the SRS is to be transmitted, and may indicate one or more antenna ports in those time-frequency resources over which the SRS is to be transmitted. 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 such as antenna switching, codebook, non-codebook, beam management, etc.

[0060] The antenna switching SRS resource set may be used to indicate downlink channel state information (CSI) with reciprocity between the uplink channel and the downlink channel. 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 transmitted using resources in the antenna switching SRS resource set) to acquire downlink CSI (e.g., to determine a downlink precoder to be used to communicate with the UE 120).

[0061] When base station 110 indicates an uplink precoder 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 precoder to UE 120 (e.g., using a precoder codebook), base station 110 may use a codebook SRS (e.g., an SRS transmitted using resources in a codebook SRS resource set) to acquire uplink CSI (e.g., to determine an uplink precoder to be indicated to the UE and used by UE 120 to communicate with base station 110). In some aspects, a virtual port (e.g., a combination of two or more antenna ports) with a maximum transmit power may be supported at least for codebook SRS.

[0062] 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 transmitted using resources in a non-codebook SRS resource set) to capture uplink CSI. In this case, the non-codebook SRS may be precoded using a precoder selected by UE 120 (e.g., the precoder may be indicated to base station 110).

[0063] The beam-managed SRS resource set may be used to indicate CSI for millimeter wave communications.

[0064] like Figure 4As shown in , in some aspects, different SRS resource sets (e.g., having different use cases) indicated to UE 120 may overlap (e.g., in time, frequency, etc., such as in the same time slot). For example, as shown by 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). Thus, the antenna switching SRS can be transmitted using antenna port 0 and antenna port 1 in SRS resource A (e.g., a first time-frequency resource), and can be transmitted using antenna port 2 and antenna port 3 in SRS resource B (e.g., a second time-frequency resource).

[0065] As indicated by 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 a first SRS resource (shown as SRS resource A). Thus, the codebook SRS may be transmitted in SRS resource A (e.g., a first time-frequency resource) using antenna port 0 and antenna port 1. In this case, the UE 120 may not transmit the codebook SRS in SRS resource B (e.g., a second time-frequency resource) using antenna port 2 and antenna port 3.

[0066] As above combined Figure 3 As described, when a UE 120 is configured with multiple SRS ports for MIMO mode, the UE 120 may be required to use a power scaling factor to split the transmit power equally across all antenna ports used for PUSCH transmission. In this case, the 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 the UE 120 is required to split the transmit power equally across all antenna ports on which the UE transmits PUSCH communications at non-zero transmit power. Some techniques and apparatus described herein permit the UE 120 to transmit at maximum transmit power using a virtual port that includes multiple ports (e.g., which are configured by an SRS configuration).

[0067] As indicated above, Figure 4 are provided as examples. Other examples may differ from those described in Figure 4 Examples described.

[0068] Figure 5A and Figure 5B is a simplified diagram illustrating an example 500 of a UE hardware architecture that supports maximum transmit power using virtual ports in accordance with various aspects of the present disclosure.

[0069] like Figure 5AAs 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 5A UE 120 is shown as 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 20dBm, a third power amplifier (PA3) supporting a maximum power of 17dBm, and a fourth power amplifier (PA4) supporting a maximum power of 17dBm.

[0070] 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, then 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.

[0071] Using this hardware architecture, for a power class 3 UE 120 with a maximum transmit power of 23 dBm, the maximum transmit power can 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 only one example of the hardware architecture of the UE 120, and different UEs 120 may have different hardware architectures, such as different numbers of transmit antennas (or transmit chains), different numbers 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 support the maximum transmit power, and different UEs 120 may be able to use different precoders (e.g., different combinations of antennas and / or power amplifiers) to synthesize a virtual port that supports the maximum transmit power.

[0072] As above combined Figure 3 As indicated, in order for the base station 110 to indicate to the UE 120 regarding the precoder (e.g., TPMI) to be used for transmitting at maximum power, 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 instructions to transmit at maximum power using precoders that the UE 120 cannot utilize to transmit at maximum power. Some techniques and devices 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.

[0073] like Figure 5BAs shown in , a 4Tx UE 120 may have four power amplifiers (and corresponding four transmit antennas and four transmit chains), but may behave like a 2Tx UE 120 (e.g., a UE 120 having two power amplifiers and corresponding two transmit antennas and two transmit chains). For example, as shown by reference numeral 505, the 4Tx UE 120 may synthesize a first virtual port (shown as virtual port A) using PA1 and PA2, and may synthesize a second virtual port (shown as virtual port B) using PA3 and PA4. In this case, the 4Tx UE 120 may transmit using two virtual ports, and thus may behave like a 2Tx UE.

[0074] As another example, and as shown at reference numeral 510, a 4Tx UE 120 may deactivate or disable two power amplifiers, two transmit chains, and / or two transmit antennas (e.g., to save power). In this case, the 4Tx UE 120 may transmit using two activated power amplifiers, transmit chains, and / or transmit antennas, and may thus behave like a 2Tx UE. As shown at reference numeral 515, in some aspects, the 4Tx UE 120 may be able to synthesize a virtual port (shown as virtual port C) using two activated power amplifiers, transmit chains, and / or transmit antennas.

[0075] In some cases, a 4Tx UE may transmit capability information (e.g., uplink transmit capability) that is different from that of a 2Tx UE to a base station. Some techniques and devices described herein allow a 4Tx UE to report capability information (e.g., uplink transmit capability) that is relevant to scenarios where the 4Tx UE behaves like a 2Tx UE, such as Figure 5B More generally, some techniques and devices described herein allow N Tx UEs to report capability information (eg, uplink transmit capability) related to a scenario where the N Tx UEs behave like K Tx UEs, where K is less than N.

[0076] As indicated above, provide Figure 5A and Figure 5B As an example. Other examples may be related to Figure 5A and Figure 5B The examples described are different.

[0077] Figure 6 6 is a diagram illustrating an example 600 of maximum transmit power signaling and configuration using virtual ports in accordance with various aspects of the present disclosure. Figure 6 As shown, UE 120 and base station 110 may communicate with each other.

[0078] As shown in reference numeral 605, UE 120 may transmit to base station 110 an indication of whether UE 120 is capable of transmitting uplink communications using a virtual port using a maximum transmit power. The maximum transmit power may be defined by the 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, precoding and / or cyclic delay diversity may be used to combine the two or more non-coherent or partially coherent antenna ports to synthesize a virtual port. Additionally or alternatively, a virtual port may be a combination of one or more antenna ports. For example, a virtual port may be a combination of multiple (e.g., two or more antenna ports) or a single actual antenna port powered by a power amplifier 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 a virtual port, but is capable of using non-coherent ports and / or partially coherent ports by utilizing cyclic delay diversity to support maximum transmit power using a fully coherent precoder. In some aspects, a Mode 1 UE may support maximum transmit power using a precoder that spans non-coherent antenna ports. For example, a Mode 1 UE may support maximum transmit power using precoding and cyclic delay diversity.

[0079] Additionally or alternatively, UE 120 may transmit to base station 110 an indication of the number of virtual ports that UE 120 can use to transmit uplink communications using the maximum transmit power. For example, UE 120 may indicate that UE 120 can synthesize only one (e.g., a single) virtual port that supports the maximum transmit power. As another example, UE 120 may indicate that UE 120 can synthesize 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 can use a virtual port to transmit uplink communications using the maximum transmit power, and to indicate the number of virtual ports that UE 120 can use to transmit uplink communications using the maximum transmit power.

[0080] As shown by reference numeral 610, as an example of a UE 120 having two transmit antennas (and / or two transmit chains), the UE 120 may transmit 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.

[0081] In some aspects, a UE 120 having four transmit antennas (and / or four transmit chains or power amplifiers) (referred to as a 4Tx UE) may be configured to operate as a 2Tx UE when the 4Tx UE behaves like a 2Tx UE (e.g., as described above in conjunction with Figure 5B In this case, a first value of the bit (e.g., 0) may indicate that the 4Tx UE cannot use the virtual port to transmit uplink communications using the maximum transmit power. A second value of the bit (e.g., 1) may indicate that the 4Tx UE can use at least one virtual port to transmit uplink communications using the maximum transmit power. For example, if the 4Tx UE is unable to transmit uplink communications using the maximum transmit power due to the synthesis of two virtual ports (e.g., Figure 5B As another example, if a 4Tx UE behaves like a 2Tx UE due to deactivating two power amplifiers, the second value of this bit may indicate that the 4Tx UE is able to use a single virtual port (e.g., Figure 5B Virtual port C, composed of two activated power amplifiers) is used to transmit uplink communications using maximum transmit power.

[0082] In some aspects, a 4Tx UE may use a multi-bit indication (e.g., two bits), wherein a first value of the bit indicates that the 4Tx UE cannot use a virtual port to transmit uplink communications using a maximum transmit power, and a second value of the bit indicates that the 4Tx UE can only use a first virtual port (e.g., Figure 5B The third value of the bit indicates that the 4Tx UE can use only the second virtual port (e.g., virtual port A or virtual port C) to transmit uplink communications using the maximum transmit power. Figure 5B The fourth value of the bit indicates that the 4Tx UE can use both the first virtual port and the second virtual port (respectively) to transmit uplink communications using the maximum transmit power.

[0083] In some aspects, an N Tx UE (e.g., a 4Tx UE) may indicate in a UE capability report that the N Tx UE behaves like a K Tx UE (e.g., a 2Tx UE), where K < N. Additionally or alternatively, the N Tx UE may indicate in the UE capability report whether the N Tx UE behaves like a K Tx UE due to synthesizing multiple virtual ports, whether the N Tx UE behaves like a K Tx UE due to deactivating a subset of the power amplifiers of the N Tx UE, etc.

[0084] As an example of the UE 120 having four transmit antennas (and / or four transmit chains) as shown by reference numeral 615, the UE 120 may transmit a two-bit indication. A first value of the indication (e.g., 00) may indicate that the UE 120 is not able to use virtual ports to transmit uplink communications using maximum transmit power. A second value of the indication (e.g., 01) may indicate that the UE 120 is able to use at least one virtual port (e.g., one or more virtual ports) to transmit uplink communications using maximum transmit power, such as when the UE 120 is a power class 3 UE having four power amplifiers, each power amplifier capable of transmitting up to 17 dBm (e.g., where all four 17 dBm power amplifiers are combined to generate 23 dBm of power). A third value of the indication (e.g., 10) may indicate that the UE 120 is able to use two virtual ports to transmit simultaneous uplink communications using maximum transmit power on each of the two virtual ports (e.g., using different MIMO layers), such as when the UE 120 is a power class 3 UE having four power amplifiers, each power amplifier capable of transmitting up to 20 dBm (e.g., where the first 20 dBm power amplifier and the second 20 dBm power amplifier are combined to generate 23 dBm of power, and the third 20 dBm power amplifier and the fourth 20 dBm power amplifier are combined to generate 23 dBm of power). 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 the UE 120 is able to use to transmit uplink communications using maximum transmit power, such as by using the value 11.

[0085] In some aspects, a 4Tx UE that behaves like a 2Tx UE due to the synthesis of two virtual ports may indicate the ability to transmit using the maximum transmit power of each of the two virtual ports. For example, the 4Tx UE may indicate that none of the two virtual ports supports the maximum transmit power, only one of the two virtual ports supports the maximum transmit power, only the first of the two virtual ports supports the maximum transmit power, only the second of the two virtual ports supports the maximum transmit power, both virtual ports (separately or independently) support the maximum transmit power, etc. Additionally or alternatively, a 4Tx UE that behaves like a 2Tx due to the synthesis of two virtual ports may indicate whether the two virtual ports are coherent or incoherent with each other (e.g., using a single-bit indication). Additionally or alternatively, a 4Tx UE behaving like a 2Tx UE may indicate the number of activated power amplifiers (or transmit chains or transmit antennas), the number of deactivated power amplifiers (or transmit chains or transmit antennas), the number of virtual ports that the 4Tx UE is capable of synthesizing, the number of virtual ports that the 4Tx UE is capable of using to transmit using a maximum transmit power, one or more virtual port identifiers indicating which virtual ports the 4Tx UE is capable of using to transmit using a maximum transmit power, whether a pair or a group of virtual ports are coherent (or incoherent) with each other, etc. These examples are generally also applicable to an N Tx UE behaving like a K Tx UE, where K is less than N.

[0086] As another example of UE signaling, as shown in reference numeral 620, UE 120 may transmit 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 one 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 using the two bits described below to indicate support for mode 1 or mode 2, does not need to signal any information about the TPMI that supports the maximum transmit power (e.g., as described below in conjunction with Figures 7 to 10 described), etc.

[0087] As further shown, UE 120 may transmit two bits indicating whether UE 120 supports only mode 1 and not mode 2, or only mode 2 and not mode 1, or both mode 1 and mode 2, or neither mode 1 nor mode 2. Details about mode 1 and mode 2 are described above. For example, "mode 1 capability" may refer to the ability to support maximum transmit power using a precoder 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 chains with full rated power amplifiers (sometimes referred to as capability 2 UEs) and / or if less than all transmit chains (e.g., a subset thereof) of UE 120 have full rated power amplifiers (sometimes referred to as capability 3 UEs), UE 120 may use these two bits. In contrast, if UE 120 is a capability 1 UE, UE 120 does not need to signal anything with these two bits, as described above. In some aspects, if UE 120 supports Mode 2 (eg, supports or does not support Mode 1), UE 120 may transmit 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 Figures 7 to 10 If UE 120 does not support Mode 2, UE 120 may not transmit the bitmap (eg, because UE 120 does not support virtual ports).

[0088] As further shown, UE 120 may transmit the above information (e.g., a single bit and / or two bits) per frequency band (e.g., per frequency band for each frequency band-band combination supported by UE 120) for frequency band-band combinations (e.g., frequency bands in a frequency band combination) supported by UE 120. For example, UE 120 may have different capabilities for different frequency bands in each frequency band-band combination. In some aspects, UE 120 may transmit the above information for each frequency band in each frequency band-band combination supported by UE 120.

[0089] In some aspects, UE 120 may transmit the 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., so a virtual port is not required to achieve the maximum transmit power), UE 120 may transmit the capability report with an empty or null value in this field, or transmit the capability report without this field.

[0090] As indicated by reference numeral 625, the base station 110 may transmit the SRS configuration to the UE 120 based at least in part on the indication of whether the UE 120 is capable of using the virtual port to transmit uplink communications using the maximum transmit power. For example, the base station 110 may determine the SRS configuration based at least in part on the indication of whether the UE 120 is capable of using the virtual port to transmit uplink communications using the maximum transmit power, and may transmit 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 the indication from the UE 120 of the number of virtual ports that the UE 120 is capable of using to transmit uplink communications using the maximum transmit power.

[0091] 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 transmitted to the UE 120.

[0092] 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 assigns 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, as shown in FIG. Figure 6 For example, if UE 120 is capable of synthesizing a single virtual port, base station 110 may configure UE 120 with additional SRS resources having a single port (e.g., for a single virtual port). As another example, if UE 120 is capable of synthesizing two virtual ports, base station 110 may configure UE 120 with additional SRS resources including either port, such as Figure 6 As shown in SRS resource 2 and SRS resource 3 in (eg, where UE 120 selects one of the two virtual ports to use the SRS resource for sounding to save SRS overhead), or two ports, such as Figure 6 1 (eg, one for each virtual port, which allows UE 120 to sound through both virtual ports).

[0093] As indicated above, provide Figure 6 As an example. Other examples may be related to Figure 6 The examples described are different.

[0094] Figure 7 is a diagram illustrating an example 700 of maximum transmit power signaling and configuration using virtual ports in accordance with various aspects of the present disclosure. Figure 7 As shown, UE 120 and base station 110 may communicate with each other.

[0095] As indicated by reference numeral 705, UE 120 may transmit a bitmap to base station 110 indicating a set of transmit precoding matrix indicators (TPMIs) that support 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 that support the maximum transmit power includes more TPMIs than the number of TPMIs explicitly indicated by UE 120 using the bitmap. As a result, at least one TPMI in the set of TPMIs that support the maximum transmit power is not represented by a single bit of the bitmap.

[0096] For example, the bitmap may not include a single 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 precoder [1,1,1,1], where a value of 1 in the precoding 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 a multi-layer TPMI. In this case, each bit in the bitmap corresponds to a single-layer 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 can 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.

[0097] As shown in 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 connection between the transmit chains and the transmit antennas is not reconfigurable (as described below in conjunction with Figures 8 to 10(described in more detail), the length of the bitmap can be 11 bits. In the example 11-bit bitmap, the first bit of the bitmap indicates that only the first antenna of UE 120 supports the maximum transmit power (shown as [1 0 00]), the second bit of the bitmap indicates that only the second antenna of UE 120 supports the maximum transmit power (shown as [0 1 00]), the third bit of the bitmap indicates that only the third antenna of UE 120 supports the maximum transmit power (shown as [0 0 10]), the fourth bit of the bitmap indicates that only the fourth antenna of UE 120 supports the maximum transmit power (shown as [0 0 01]), the fifth bit of the bitmap indicates that only the first antenna and the third antenna support the maximum transmit power (shown as [1 0 10]), the sixth bit of the bitmap indicates that only the second antenna and the fourth antenna support the maximum transmit power (shown as [0 1 01]), the seventh bit of the bitmap indicates that only the first antenna and the second antenna support the maximum transmit power (shown as [1 1 00]), the eighth bit of the bitmap indicates that only the first antenna and the fourth antenna support the maximum transmit power (shown as [1 0 01]), the ninth bit of the bitmap indicates that only the second antenna and the third antenna support the maximum transmit power (shown as [0 1 10]), the tenth bit of the bitmap indicates that only the third antenna and the fourth antenna support the maximum transmit power (shown as [0 0 11]), and the eleventh bit of the bitmap indicates that only the first antenna, the second antenna, and the third antenna support the maximum transmit power (shown as [1 1 1 0]). Using this combination of TPMIs (e.g., which can include a subset of the full set of TPMIs that support the maximum transmit power of UE 120), the base station 110 can derive the full set of TPMIs that support the maximum transmit power of UE 120.

[0098] In some aspects, the bitmap indicated by UE 120 can include a different number of bits than those described in connection with Figure 7 In some aspects, the number of bits included in the bitmap can depend on the number of transmit chains included in UE 120, the number of transmit antennas included in UE 120, whether the connection between the transmit chains of UE 120 and the transmit antennas of UE 120 is reconfigurable, whether UE 120 is an N Tx UE that behaves like a K Tx UE (where K < N), whether the N Tx UE behaves like a K Tx UE due to synthesizing multiple virtual ports, whether the N Tx UE behaves like a K Tx UE due to deactivating a subset of the power amplifiers of the N Tx UE, etc. In some aspects, UE 120 can convey an indication to the base station 110 as to whether the connection between the transmit chains of UE 120 and the transmit antennas of UE 120 is reconfigurable. Additional details are described below in connection with Figures 8 to 10 Additional details are described below in connection with

[0099] In some aspects, UE 120 may underreport TPMIs that support the maximum transmit power of UE 120. For example, the full 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 leaking details about the hardware architecture of UE 120.

[0100] As shown at reference numeral 715, base station 110 may determine a full set of TPMIs that support a maximum transmit power for UE 120. As shown at reference numeral 720, the full set of TPMIs may include a first set of TPMIs (e.g., an explicit set) that is explicitly represented by bits in a bitmap. In example 700, UE 120 transmits a 1 for the first bit of the bitmap corresponding to TPMI [1 0 0 0], a 1 for the tenth bit of the bitmap corresponding to TPMI [0 0 1 1], and zeros for all other bits in the bitmap. Thus, UE 120 explicitly indicates (e.g., using corresponding bits in the bitmap) that TPMIs [1 0 0 0] and [0 0 1 1] support a maximum transmit power for UE 120.

[0101] As indicated by reference numeral 725, the full set of TPMIs may include a second set of TPMIs (e.g., an implicit set) that is not explicitly indicated by a bit in the bitmap. The base station 110 may determine the second set of TPMIs using the first set of TPMIs 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 thus 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.

[0102] As indicated by reference numeral 730, the base station 110 may transmit 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 uplink transmission. The base station 110 may select a TPMI from the full set of TPMIs that support the maximum transmit power of the UE 120. Therefore, 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 transmitted to the base station 110. In the absence of 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, resulting in errors, UE incompatibility, uplink transmission at less than or greater than the maximum transmit power, etc.

[0103] As shown in the reference numeral 735, the UE 120 may transmit uplink communications using a TPMI included in the TPMI set. For example, the UE 120 may transmit uplink communications using a TPMI indicated by the base station 110, which TPMI is included in the full set of TPMIs supporting the maximum transmit power. The UE 120 may transmit uplink communications using the maximum transmit power in accordance with instructions from the base station 110. In this case, the UE 120 may transmit uplink communications using a power allocation procedure associated with transmission using the TPMI. For example, the UE 120 may transmit uplink communications by not performing power scaling on the uplink communications, by not applying a power scaling factor to the uplink communications, by not performing one or more power scaling steps when transmitting the uplink communications, and the like. In this way, although the uplink communications are transmitted using multiple antenna ports, the UE 120 may be able to transmit uplink communications using the maximum transmit power.

[0104] As indicated above, provide Figure 7 As an example. Other examples may be related to Figure 7 The examples described are different.

[0105] Figure 8 is a simplified diagram illustrating an example 800 of maximum transmit power signaling and configuration using virtual ports in accordance with various aspects of the present disclosure.

[0106] like Figure 8As 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 welded 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, the length of the bitmap used by UE 120 to indicate the maximum transmit power supported by UE 120 can be 11 bits, as described above in conjunction with Figure 7 In some aspects, when a 4Tx UE that behaves like a 2Tx UE due to the synthesis of two virtual ports does not support a reconfigurable connection between the transmit chain (or power amplifier) ​​and the antenna, the 4Tx UE may use a combination of Figure 8 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 can correctly interpret the bitmap to derive the full set of TPMIs that support the maximum transmit power.

[0107] As indicated above, provide Figure 8 As an example. Other examples may be related to Figure 8 The examples described are different.

[0108] Fig. 9 is a diagram illustrating an example 900 of maximum transmit power signaling and configuration using virtual ports in accordance with various aspects of the present disclosure.

[0109] 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. Alternatively, a 4Tx UE that behaves like a 2Tx UE due to deactivation of two power amplifiers may include two activated transmit chains and two activated transmit chains. Each activated 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 not reconfigurable, as described above in conjunction with Figure 8As described. In these cases (e.g., 2Tx UE or 4Tx UE that behaves like a 2Tx UE due to deactivation of two power amplifiers), the length of the bitmap used by UE 120 to indicate the TPMI that supports the maximum transmit power of UE 120 can be 2 bits. In some aspects, a 4Tx UE that behaves like a 2Tx UE due to synthesis of two virtual ports can use a bitmap with a length of 2 bits to indicate the TPMI that supports the maximum transmit power. In this case, each TPMI corresponds to a virtual port. Therefore, in some aspects, the TPMI can correspond to a virtual port instead of an actual port.

[0110] In the example 2-bit bitmap (e.g., for a 2Tx UE or a 4Tx UE that behaves like a 2Tx UE due to deactivation of two power amplifiers), 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 full set of TPMIs that support the maximum transmit power of UE 120), base station 110 is able to derive the full set of TPMIs that support the maximum transmit power of UE 120. For example, the full set of TPMIs may include [1 0] and [1 1], may include [0 1] and [1 1], or may include [1 0], [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 can correctly interpret the bitmap to derive the full set of TPMIs that support the maximum transmit power. In another example 2-bit bitmap (e.g., for a 4Tx UE that behaves like a 2Tx UE due to the synthesis of two virtual ports), the first bit of the bitmap indicates that only the first virtual port of UE 120 (e.g., Figure 5B The virtual port A of UE 120 supports the maximum transmit power, and the second bit of the bitmap indicates that only the second virtual port of UE 120 (eg, Figure 5B The virtual port B) supports the maximum transmit power.

[0111] In some aspects, UE 120 may be required to support maximum transmit power using TPMI [1 0] (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 antennas and / or transmit chains of UE 120 that support a maximum transmit power for the power class of UE 120 (e.g., 23 dBm in example 900). Thus, if UE 120 has only two transmit antennas and is capable of combining antenna ports to transmit uplink communications using maximum transmit power (e.g., using virtual ports), UE 120 may be required to support maximum transmit power using only (or at least) the first antenna of UE 120 (e.g., using TPMI [1 0]). 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 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 these TPMIs are [1 0] and [1 1].

[0112] As indicated above, provide Fig. 9 As an example. Other examples may be related to Fig. 9 The examples described are different.

[0113] Fig.10 is a simplified diagram illustrating an example 1000 of maximum transmit power signaling and configuration using virtual ports in accordance with various aspects of the present disclosure.

[0114] like Fig.10 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 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 with the antenna (e.g., a switched connection, a wired connection with a switch, etc.), the transmit chain may include a switch that allows the transmit chain and / or the 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. In some aspects, when a 4Tx UE that behaves like a 2Tx UE due to the synthesis of two virtual ports supports a reconfigurable connection between the transmit chain (or power amplifier) ​​and the antenna, the 4Tx UE may use a combination of Fig.10 TPMI signaling as described.

[0115] 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 this combination of TPMIs (e.g., which may include a subset of the full set of TPMIs that support the maximum transmit power of UE 120), base station 110 is able to derive the full set of TPMIs that support the maximum transmit power of UE 120. For example, if UE 120 indicates that a single antenna of UE 120 is used to support a maximum transmit power (e.g., TPMI[1 0 0 0]), the full set of TPMIs may include at least TPMI[1 0 0 0], TPMI[0 1 0 0], TPMI[0 0 1 0], 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 is able to correctly interpret the bitmap to derive the full set of TPMIs supporting the maximum transmit power.

[0116] As indicated above, provide Fig.10 As an example. Other examples may be related to Fig.10 The examples described are different.

[0117] Fig.11 is a simplified diagram illustrating an example process 1100, performed, for example, by a UE, in accordance with various aspects of the present disclosure. Example process 1100 is an example of a UE (eg, UE 120, etc.) performing operations associated with maximum transmit power signaling and configuration using a virtual port.

[0118] like Fig.11 As shown, in some aspects, process 1100 may include transmitting to a base station an indication of whether the UE is capable of transmitting uplink communications using a virtual port using a maximum transmit power according to a power class of the UE, wherein the virtual port is a combination of one or more antenna ports (block 1110). For example, the UE (e.g., using transmit processor 264, controller / processor 280, memory 282, etc.) may transmit to a base station an indication of whether the UE is capable of transmitting uplink communications using a virtual port using a maximum transmit power according to a power class of the UE, as described above. In some aspects, the virtual port is a combination of one or more antenna ports.

[0119] 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, 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, as described above.

[0120] Process 1100 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.

[0121] In a first aspect, an indication of whether the UE is capable of using a virtual port to transmit uplink communications using the maximum transmit power is transmitted if the UE is unable to support the maximum transmit power by setting the power scaling factor to 1 for all precoders supported by the UE.

[0122] In a second aspect, alone or in combination with the first aspect, the indication further indicates whether the UE can support the maximum transmit power using a precoder across non-coherent antenna ports.

[0123] 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 precoder across non-coherent antenna ports without 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 without using a precoder 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 a precoder 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 precoder 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.

[0124] In a fourth aspect, alone or in combination with one or more of the first to third aspects, the indication is per frequency band-by-frequency band combination supported by the UE.

[0125] In a fifth aspect, alone or in combination with one or more of the first to fourth aspects, process 1100 includes transmitting an indication of a number of virtual ports that the UE can use to transmit uplink communications using the maximum transmit power.

[0126] In a sixth aspect, either 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 transmit 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 transmit uplink communications using the maximum transmit power.

[0127] In a seventh aspect, alone or in combination with one or more of the first to sixth aspects, the indication is a single bit when the UE includes two transmit chains.

[0128] 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 able to use a virtual port to transmit uplink communications using the maximum transmit power, the second value of the indication indicates that the UE is able to use at least one virtual port to transmit uplink communications using the maximum transmit power, and the third value of the indication indicates that the UE is able to use two virtual ports to transmit simultaneous uplink communications using the maximum transmit power on each of the two virtual ports.

[0129] In a ninth aspect, alone or in combination with one or more of the first to eighth aspects, the indication is two bits when the UE includes four transmit chains.

[0130] In a tenth aspect, either alone or in combination with one or more of the first to ninth aspects, the indication is transmitted in a field of a capability report, and the field is empty or excluded from the capability report when each transmit chain of the UE includes a power amplifier capable of supporting the maximum transmit power.

[0131] 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 the sounding reference signal resource set indicated in the sounding reference signal configuration is at least partially based on the indication.

[0132] In a twelfth aspect, alone or in combination with one or more of the first to eleventh aspects, the UE is capable of synthesizing multiple virtual ports; and process 1100 includes: transmitting an indication of at least one of: which virtual port of the multiple virtual ports the UE is capable of using to transmit uplink communications using the maximum transmit power, whether a set of virtual ports in the multiple virtual ports are coherent, or a combination thereof.

[0133] 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 in the process 1100. Additionally or alternatively, two or more blocks of the process 1100 may be executed in parallel.

[0134] Fig.12 is a simplified diagram illustrating an example process 1200, performed, for example, by a UE, in accordance with various aspects of the present disclosure. The example process 1200 is an example of a UE (eg, UE 120, etc.) performing operations associated with maximum transmit power signaling and configuration using a virtual port.

[0135] like Fig.12 As shown, in some aspects, process 1200 may include transmitting a bitmap to a base station, the bitmap indicating a set of TPMIs that support a maximum transmit power for uplink communications 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 a single bit of the bitmap (block 1210). For example, the UE (e.g., using transmit processor 264, controller / processor 280, memory 282, etc.) may transmit a bitmap to a base station, the bitmap indicating a set of TPMIs that support a maximum transmit power for uplink communications according to a power class of the UE, as described above. In some aspects, at least one TPMI in the set of TPMIs that support the maximum transmit power is not represented by a single bit of the bitmap.

[0136] like Fig.12 As further shown, in some aspects, process 1200 may include transmitting uplink communications using a TPMI included in the TPMI set and using a power allocation procedure associated with transmission using the TPMI (block 1220). For example, the UE (e.g., using transmit processor 264, controller / processor 280, memory 282, etc.) may transmit uplink communications using a TPMI included in the TPMI set and using a power allocation procedure associated with transmission using the TPMI, as described above.

[0137] Process 1200 may include additional aspects, such as any single aspect or any combination of aspects described below and / or in conjunction with one or more other processes described elsewhere herein.

[0138] In a first aspect, the set of TPMIs supporting the maximum transmit power includes more TPMIs than the number of TPMIs explicitly indicated by the UE as supporting the maximum transmit power using the bitmap.

[0139] In a second aspect, alone or in combination with the first aspect, the at least one TPMI comprises a TPMI of all transmit chains in which the UE is used.

[0140] 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.

[0141] 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.

[0142] 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 corresponding connections between the transmit chains and transmit antennas are not reconfigurable, the length of the bitmap is 11 bits.

[0143] 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 only the first transmission chain of the UE is used to support the maximum transmission power, the second bit of the bitmap indicates that only the second transmission chain of the UE is used to support the maximum transmission power, the third bit of the bitmap indicates that only the third transmission chain of the UE is used to support the maximum transmission power, the fourth bit of the bitmap indicates that only the fourth transmission chain of the UE is used to support the maximum transmission power, the fifth bit of the bitmap indicates that only the first transmission chain and the third transmission chain are used to support the maximum transmission power, and the sixth bit of the bitmap indicates that Only the second transmission chain and the fourth transmission chain are used to support the maximum transmission power, the seventh bit of the bitmap indicates that only the first transmission chain and the second transmission chain are used to support the maximum transmission power, the eighth bit of the bitmap indicates that only the first transmission chain and the fourth transmission chain are used to support the maximum transmission power, the ninth bit of the bitmap indicates that only the second transmission chain and the third transmission chain are used to support the maximum transmission power, the tenth bit of the bitmap indicates that only the third transmission chain and the fourth transmission chain are used to support the maximum transmission power, and the eleventh bit of the bitmap indicates that only the first transmission chain, the second transmission chain, and the third transmission chain are used to support the maximum transmission power.

[0144] 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 the maximum transmit power of the UE.

[0145] 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 corresponding connections between the transmit chains and transmit antennas are not reconfigurable, the length of the bitmap is 2 bits.

[0146] In a ninth aspect, either alone or in combination with one or more of the first to eighth aspects, the first bit of the bitmap indicates that only the first transmission chain of the UE is used to support the maximum transmission power, and the second bit of the bitmap indicates that only the second transmission chain of the UE is used to support the maximum transmission power.

[0147] In a tenth aspect, either alone or in combination with one or more of the first to ninth aspects, the UE is required to use only the first transmit chain of the UE to support the maximum transmit power when the UE has only two transmit chains and is capable of combining antenna ports to transmit uplink communications using the maximum transmit power.

[0148] 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 corresponding connections between the transmit chains and transmit antennas are reconfigurable, the length of the bitmap is 3 bits.

[0149] In a twelfth aspect, alone or in combination with one or more of the first to eleventh aspects, the first bit of the bitmap indicates that only a single transmit chain of the UE is used to support the maximum transmit power, the second bit of the bitmap indicates that two transmit chains of the UE are used to support the maximum transmit power, and the third bit of the bitmap indicates that three transmit chains of the UE are used to support the maximum transmit power.

[0150] In a thirteenth aspect, alone or in combination with one or more of the first to twelfth aspects, process 1200 includes: transmitting to the base station an indication of whether a connection between a transmit chain of the UE and a transmit antenna of the UE is reconfigurable.

[0151] In a fourteenth aspect, either alone or in combination with one or more of the first to thirteenth aspects, the power allocation procedure includes: refraining from performing power scaling when transmitting using the TPMI, or employing a different power allocation procedure when transmitting using the TPMI than when transmitting using a TPMI not included in the TPMI set.

[0152] In a fifteenth aspect, alone or in combination with one or more of the first to fourteenth aspects, the TPMI set corresponds to a set of virtual ports synthesized by the UE.

[0153] although Fig.12 An example block diagram of process 1200 is shown, but in some aspects, process 1200 may include Fig.12 Additional blocks, fewer blocks, different blocks, or differently arranged blocks than those depicted in the process 1200. Additionally or alternatively, two or more blocks of the process 1200 may be executed in parallel.

[0154] Fig.13 is a simplified diagram illustrating an example process 1300, performed, for example, by a base station, in accordance with various aspects of the present disclosure. Example process 1300 is an example of a base station (eg, base station 110, etc.) performing operations associated with maximum transmit power signaling and configuration using a virtual port.

[0155] like Fig.13As shown, in some aspects, process 1300 may include receiving an indication from a UE as to 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, wherein the virtual port is a combination of one or more antenna ports (block 1310). For example, a base station (e.g., using receive processor 238, controller / processor 240, memory 242, etc.) may receive an indication from a UE as to 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, as described above. In some aspects, a virtual port is a combination of one or more antenna ports.

[0156] like Fig.13 As further shown, in some aspects, process 1300 may include transmitting a sounding reference signal configuration to the UE based at least in part on the indication (block 1320). For example, the base station (e.g., using transmit processor 220, controller / processor 240, memory 242, etc.) may transmit a sounding reference signal configuration to the UE based at least in part on the indication, as described above.

[0157] 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.

[0158] In a first aspect, the indication of whether the UE can use the virtual port to transmit uplink communications using the maximum transmit power is received when the UE is unable to support the maximum transmit power by setting the power scaling factor to 1 for all precoders supported by the UE.

[0159] In a second aspect, alone or in combination with the first aspect, the indication further indicates whether the UE can support the maximum transmit power using a precoder across non-coherent antenna ports.

[0160] 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 precoder across non-coherent antenna ports without 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 without using a precoder 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 a precoder 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 precoder 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.

[0161] In a fourth aspect, alone or in combination with one or more of the first to third aspects, the indication is per frequency band-by-frequency band combination supported by the UE.

[0162] 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 the maximum transmit power.

[0163] In a sixth aspect, either 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 capable of using a virtual port to transmit uplink communications using maximum transmit power, and the second value of the indication indicates that the UE is capable of using a single virtual port to transmit uplink communications using maximum transmit power.

[0164] In a seventh aspect, alone or in combination with one or more of the first to sixth aspects, the indication is a single bit when the UE includes two transmit chains.

[0165] 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 transmit uplink communications using maximum transmit power, the second value of the indication indicates that the UE is capable of using at least one virtual port to transmit uplink communications using maximum transmit power, and the third value of the indication indicates that the UE is capable of using two virtual ports to transmit simultaneous uplink communications using maximum transmit power on each of the two virtual ports.

[0166] In a ninth aspect, alone or in combination with one or more of the first to eighth aspects, the indication is two bits when the UE includes four transmit chains.

[0167] In a tenth aspect, either 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 the field is empty or excluded from the capability report when each transmit chain of the UE includes a power amplifier capable of supporting the maximum transmit power.

[0168] 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 the sounding reference signal resource set indicated in the sounding reference signal configuration is at least partially based on the indication.

[0169] In a twelfth aspect, alone or in combination with one or more of the first to eleventh aspects, the UE is capable of synthesizing multiple virtual ports; and process 1300 includes receiving an indication of at least one of: which virtual port of the multiple virtual ports the UE is capable of using to transmit uplink communications using the maximum transmit power, whether a set of virtual ports in the multiple virtual ports are coherent, or a combination thereof.

[0170] although Fig.13 Example blocks of process 1300 are shown, but in some aspects, process 1300 may include Fig.13 Additional blocks, fewer blocks, different blocks, or differently arranged blocks than those depicted in the process 1300. Additionally or alternatively, two or more blocks of the process 1300 may be executed in parallel.

[0171] Fig.14 is a simplified diagram illustrating an example process 1400, performed, for example, by a base station, in accordance with various aspects of the present disclosure. Example process 1400 is an example of a base station (eg, base station 110, etc.) performing operations associated with maximum transmit power signaling and configuration using a virtual port.

[0172] 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 communications 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 a single bit of the bitmap (block 1410). For example, 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 communications according to a power class of the UE, as described above. In some aspects, at least one TPMI in the set of TPMIs that support the maximum transmit power is not represented by a single bit of the bitmap.

[0173] like Fig.14 As further shown, in some aspects, process 1400 may include transmitting to the UE an instruction to transmit using the maximum transmit power and the TPMI included in the TPMI set (block 1420). For example, the base station (e.g., using transmit processor 220, controller / processor 240, memory 242, etc.) may transmit to the UE an instruction to transmit using the maximum transmit power and the TPMI included in the TPMI set, as described above.

[0174] Process 1400 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.

[0175] In a first aspect, the set of TPMIs supporting the maximum transmit power includes more TPMIs than the number of TPMIs explicitly indicated by the UE as supporting the maximum transmit power using the bitmap.

[0176] In a second aspect, alone or in combination with the first aspect, the at least one TPMI comprises a TPMI of all transmit chains in which the UE is used.

[0177] 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.

[0178] 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.

[0179] 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 corresponding connections between the transmit chains and transmit antennas are not reconfigurable, the length of the bitmap is 11 bits.

[0180] 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 only the first transmission chain of the UE is used to support the maximum transmission power, the second bit of the bitmap indicates that only the second transmission chain of the UE is used to support the maximum transmission power, the third bit of the bitmap indicates that only the third transmission chain of the UE is used to support the maximum transmission power, the fourth bit of the bitmap indicates that only the fourth transmission chain of the UE is used to support the maximum transmission power, the fifth bit of the bitmap indicates that only the first transmission chain and the third transmission chain are used to support the maximum transmission power, and the sixth bit of the bitmap indicates that Only the second transmission chain and the fourth transmission chain are used to support the maximum transmission power, the seventh bit of the bitmap indicates that only the first transmission chain and the second transmission chain are used to support the maximum transmission power, the eighth bit of the bitmap indicates that only the first transmission chain and the fourth transmission chain are used to support the maximum transmission power, the ninth bit of the bitmap indicates that only the second transmission chain and the third transmission chain are used to support the maximum transmission power, the tenth bit of the bitmap indicates that only the third transmission chain and the fourth transmission chain are used to support the maximum transmission power, and the eleventh bit of the bitmap indicates that only the first transmission chain, the second transmission chain, and the third transmission chain are used to support the maximum transmission power.

[0181] 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 the maximum transmit power of the UE.

[0182] 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 corresponding connections between the transmit chains and transmit antennas are not reconfigurable, the length of the bitmap is 2 bits.

[0183] In a ninth aspect, either alone or in combination with one or more of the first to eighth aspects, the first bit of the bitmap indicates that only the first transmission chain of the UE is used to support the maximum transmission power, and the second bit of the bitmap indicates that only the second transmission chain of the UE is used to support the maximum transmission power.

[0184] In a tenth aspect, either alone or in combination with one or more of the first to ninth aspects, the UE is required to use only the first transmit chain of the UE to support the maximum transmit power when the UE has only two transmit chains and is capable of combining antenna ports to transmit uplink communications using the maximum transmit power.

[0185] 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 corresponding connections between the transmit chains and transmit antennas are reconfigurable, the length of the bitmap is 3 bits.

[0186] In a twelfth aspect, alone or in combination with one or more of the first to eleventh aspects, the first bit of the bitmap indicates that only a single transmit chain of the UE is used to support the maximum transmit power, the second bit of the bitmap indicates that two transmit chains of the UE are used to support the maximum transmit power, and the third bit of the bitmap indicates that three transmit chains of the UE are used to support the maximum transmit power.

[0187] 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 as to whether a connection between a transmit chain of the UE and a transmit antenna of the UE is reconfigurable.

[0188] In a fourteenth aspect, alone or in combination with one or more of the first to thirteenth aspects, the TPMI set corresponds to a set of virtual ports synthesized by the UE.

[0189] although Fig.14 Example blocks of process 1400 are shown, but in some aspects, process 1400 may include Fig.14 Additional blocks, fewer blocks, different blocks, or differently arranged blocks than those depicted in the process 1400. Additionally or alternatively, two or more blocks of the process 1400 may be executed in parallel.

[0190] Fig.15is a simplified diagram illustrating an example process 1500 performed, for example, by a UE in accordance with various aspects of the present disclosure. Example process 1500 is an example of a UE (eg, UE 120) performing operations associated with maximum transmit power signaling and configuration using a virtual port.

[0191] like Fig.15 As shown, in some aspects, process 1500 may include transmitting to a base station an indication of 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, wherein the virtual port is a combination of one or more antenna ports, and wherein the indication is based at least in part on an operating mode of the UE (block 1510). For example, the UE (e.g., using antenna 252, transmit processor 264, TX MIMO processor 266, modulator 254, controller / processor 280, and / or memory 282) may transmit to a base station an indication of 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, as described above. In some aspects, the virtual port is a combination of one or more antenna ports. In some aspects, the indication is based at least in part on an operating mode of the UE.

[0192] like Fig.15 As further shown, in some aspects, process 1500 may include receiving a sounding reference signal configuration from a base station based at least in part on the indication (block 1520). For example, the UE (e.g., using antenna 252, demodulator 254, MIMO detector 256, receive processor 258, controller / processor 280, and / or memory 282) may receive a sounding reference signal configuration from a base station based at least in part on the indication, as described above.

[0193] Process 1500 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.

[0194] In a first aspect, the operating mode is based at least in part on a number of actual transmit antenna ports used by the UE or a number of virtual transmit antenna ports used by the UE.

[0195] In a second aspect, either alone or in combination with the first aspect, the indication comprises a first indication of a capability selected from a first set of capabilities based at least in part on the UE operating in a first operating mode, or wherein the indication comprises a second indication of a capability selected from a second set of capabilities based at least in part on the UE operating in a second operating mode.

[0196] In a third aspect, alone or in combination with one or more of the first and second aspects, the first operating mode uses a fewer number of transmit antennas than the number of transmit antennas used for the second operating mode.

[0197] In a fourth aspect, alone or in combination with one or more of the first to third aspects, a first indication is indicated using a smaller number of bits than a number of bits used to indicate a second indication.

[0198] In a fifth aspect, either alone or in combination with one or more of the first to fourth aspects, a first bit value of the first indication indicates that the UE is not capable of using a virtual port to transmit uplink communications using a maximum transmit power according to a power class of the UE, and wherein a second bit value of the first indication indicates that 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.

[0199] In the sixth aspect, alone or in combination with one or more of the first to fifth aspects, the first bit value of the second indication indicates that the UE is not able to use the virtual port to transmit uplink communications using the maximum transmit power according to the UE's power class, and wherein one or more other bit values ​​of the second indication indicate at least one of the following: which virtual port or virtual ports the UE can use to transmit uplink communications using the maximum transmit power, or the number of virtual ports that the UE can use to transmit uplink communications using the maximum transmit power.

[0200] In the seventh aspect, alone or in combination with one or more of the first to sixth aspects, the first bit value of the second indication indicates that the UE is not able to use the virtual port to transmit uplink communications using the maximum transmit power according to the power class of the UE, wherein the second bit value of the second indication indicates that the UE is able to use only the first virtual port to transmit uplink communications using the maximum transmit power, wherein the third bit value of the second indication indicates that the UE is able to use only the second virtual port to transmit uplink communications using the maximum transmit power, and wherein the fourth bit value of the second indication indicates that the UE is able to use both the first virtual port and the second virtual port, respectively, to transmit uplink communications using the maximum transmit power.

[0201] although Fig.15 An example block diagram of process 1500 is shown, but in some aspects, process 1500 may include Fig.15 The blocks depicted in the process 1500 may include additional blocks, fewer blocks, different blocks, or blocks arranged in a different manner than those depicted in the process 1500. Additionally or alternatively, two or more blocks of the process 1500 may be executed in parallel.

[0202] Fig.16is a simplified diagram illustrating an example process 1600, performed, for example, by a base station, in accordance with various aspects of the present disclosure. Example process 1600 is an example of a base station (eg, base station 110) performing operations associated with maximum transmit power signaling and configuration using a virtual port.

[0203] like Fig.16 As shown, in some aspects, process 1600 may include receiving an indication from a UE as to 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, wherein the virtual port is a combination of one or more antenna ports, and wherein the indication is based at least in part on an operating mode of the UE (block 1610). For example, a base station (e.g., using antenna 234, demodulator 232, MIMO detector 236, receive processor 238, controller / processor 240, and / or memory 242) may receive an indication from a user equipment (UE) as to 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, as described above. In some aspects, the virtual port is a combination of one or more antenna ports. In some aspects, the indication is based at least in part on an operating mode of the UE.

[0204] like Fig.16 As further shown, in some aspects, process 1600 may include transmitting a sounding reference signal configuration to the UE based at least in part on the indication (block 1620). For example, the base station (e.g., using transmit processor 220, TX MIMO processor 230, modulator 232, antenna 234, controller / processor 240, memory 242, and / or scheduler 246) may transmit a sounding reference signal configuration to the UE based at least in part on the indication, as described above.

[0205] Process 1600 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.

[0206] In a first aspect, the operating mode is based at least in part on a number of actual transmit antenna ports used by the UE or a number of virtual transmit antenna ports used by the UE.

[0207] In a second aspect, either alone or in combination with the first aspect, the indication comprises a first indication of a capability selected from a first set of capabilities based at least in part on the UE operating in a first operating mode, or wherein the indication comprises a second indication of a capability selected from a second set of capabilities based at least in part on the UE operating in a second operating mode.

[0208] In a third aspect, alone or in combination with one or more of the first and second aspects, the first operating mode uses a fewer number of transmit antennas than the number of transmit antennas used for the second operating mode.

[0209] In a fourth aspect, alone or in combination with one or more of the first to third aspects, a first indication is indicated using a smaller number of bits than a number of bits used to indicate a second indication.

[0210] In a fifth aspect, either alone or in combination with one or more of the first to fourth aspects, a first bit value of the first indication indicates that the UE is not capable of using a virtual port to transmit uplink communications using a maximum transmit power according to a power class of the UE, and wherein a second bit value of the first indication indicates that 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.

[0211] In the sixth aspect, alone or in combination with one or more of the first to fifth aspects, the first bit value of the second indication indicates that the UE is not able to use the virtual port to transmit uplink communications using the maximum transmit power according to the UE's power class, and wherein one or more other bit values ​​of the second indication indicate at least one of the following: which virtual port or virtual ports the UE can use to transmit uplink communications using the maximum transmit power, or the number of virtual ports that the UE can use to transmit uplink communications using the maximum transmit power.

[0212] In the seventh aspect, alone or in combination with one or more of the first to sixth aspects, the first bit value of the second indication indicates that the UE is not able to use the virtual port to transmit uplink communications using the maximum transmit power according to the power class of the UE, wherein the second bit value of the second indication indicates that the UE is able to use only the first virtual port to transmit uplink communications using the maximum transmit power, wherein the third bit value of the second indication indicates that the UE is able to use only the second virtual port to transmit uplink communications using the maximum transmit power, and wherein the fourth bit value of the second indication indicates that the UE is able to use both the first virtual port and the second virtual port, respectively, to transmit uplink communications using the maximum transmit power.

[0213] although Fig.16 An example block diagram of process 1600 is shown, but in some aspects, process 1600 may include Fig.16 The blocks depicted in the process 1600 may include additional blocks, fewer blocks, different blocks, or blocks arranged in a different manner than those depicted in the process 1600. Additionally or alternatively, two or more blocks of the process 1600 may be executed in parallel.

[0214] 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 by practice of the various aspects.

[0215] 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 with hardware, firmware, and / or a combination of hardware and software.

[0216] 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.

[0217] It will be apparent that the systems and / or methods described herein can be implemented in different forms of hardware, firmware, and / or a combination of hardware and software. The actual dedicated control hardware or software code used to implement these systems and / or methods does not limit the various aspects. Thus, the operation and behavior of these systems and / or methods are described herein without reference to specific software codes-it is understood that software and hardware can be designed to implement these systems and / or methods based at least in part on the description herein.

[0218] Although specific feature combinations are described in the claims and / or disclosed in the specification, these combinations are not intended to limit the disclosure of various aspects. In fact, many of these features can be combined in a manner not specifically described in the claims and / or not disclosed in the specification. Although each dependent claim listed below can be directly subordinate to only one claim, the disclosure of various aspects includes that each dependent claim is combined with each other claim in this group of claims. The phrase "at least one" quoted in a column of items refers to any combination of these items, including single members. As an example, "at least one of a, b or c" is intended to cover: a, b, c, ab, ac, bc and abc, and any combination with multiple identical elements (for example, aa, aaa, aab, aac, abb, acc, bb, bbb, bbc, cc and ccc, or any other sorting of a, b and c).

[0219] Elements, actions or instructions used herein should not be interpreted as critical or necessary unless explicitly described as such. Moreover, as used herein, the articles "one" and "a" are intended to include one or more items and can be used interchangeably with "one or more". In addition, as used herein, the terms "set" and "group" are intended to include one or more items (e.g., related items, non-related items, combinations of related and non-related items, etc.), and can be used interchangeably with "one or more". In the case of intending to have only one item, the phrase "only one" or similar language is used. Moreover, as used herein, the terms "having", "containing", "including", etc. are intended to be open terms. In addition, the phrase "based on" is intended to mean "based at least in part on", unless otherwise explicitly stated.

Claims

1. A wireless communication method performed by a user equipment UE, include: transmitting to a network node an indication of whether the UE can use a virtual port to transmit uplink communications using a maximum transmit power according to a power class of the UE, wherein the virtual port is a combination of one or more antenna ports, and wherein the indication is based at least in part on an operating mode of the UE; and A sounding reference signal configuration is received from the network node based at least in part on the indication.

2. The method according to claim 1, in, The operating mode is based at least in part on a number of actual transmit antenna ports used by the UE or a number of virtual transmit antenna ports used by the UE.

3. The method according to claim 1, in, The indication comprises a first indication of a capability selected from a first set of capabilities based at least in part on the UE operating in a first operating mode, or wherein the indication comprises a second indication of a capability selected from a second set of capabilities based at least in part on the UE operating in a second operating mode.

4. The method according to claim 3, in, The first mode of operation uses a fewer number of transmit antennas than a number of transmit antennas used for the second mode of operation.

5. The method according to claim 3, in, The first indication is indicated using a smaller number of bits than a number of bits used to indicate the second indication.

6. The method according to claim 3, in, The first bit value of the first indication indicates that the UE cannot use a virtual port to transmit uplink communications using the maximum transmit power according to the power class of the UE, and The second bit value of the first indication indicates that the UE can use a virtual port to transmit uplink communications using the maximum transmit power according to the power class of the UE.

7. The method according to claim 3, in, The first bit value of the second indication indicates that the UE is unable to use a virtual port to transmit uplink communications using the maximum transmit power according to the power class of the UE, and The one or more other bit values ​​of the second indication indicate at least one of the following: which virtual port or ports the UE can use to transmit uplink communications using the maximum transmit power, or The number of virtual ports that the UE can use to transmit uplink communications using the maximum transmit power.

8. The method according to claim 3, in, a first bit value of the second indication indicating that the UE is not capable of using a virtual port to transmit uplink communications using the maximum transmit power according to the power class of the UE, The second bit value of the second indication indicates that the UE can use only the first virtual port to transmit uplink communications using the maximum transmit power, wherein the third bit value of the second indication indicates that the UE can use only the second virtual port to transmit uplink communications using the maximum transmit power, and The fourth bit value of the second indication indicates that the UE can use both the first virtual port and the second virtual port to transmit uplink communications using the maximum transmit power.

9. A wireless communication method performed by a network node, include: receiving an indication from a user equipment (UE) as to whether the UE can use a virtual port to transmit uplink communications using a maximum transmit power according to a power class of the UE, wherein the virtual port is a combination of one or more antenna ports, and wherein the indication is based at least in part on an operating mode of the UE; and A sounding reference signal configuration is transmitted to the UE based at least in part on the indication.

10. The method according to claim 9, in, The operating mode is based at least in part on a number of actual transmit antenna ports used by the UE or a number of virtual transmit antenna ports used by the UE.

11. The method according to claim 9, in, The indication comprises a first indication of a capability selected from a first set of capabilities based at least in part on the UE operating in a first operating mode, or wherein the indication comprises a second indication of a capability selected from a second set of capabilities based at least in part on the UE operating in a second operating mode.

12. The method according to claim 11, in, The first mode of operation uses a fewer number of transmit antennas than a number of transmit antennas used for the second mode of operation.

13. The method according to claim 11, in, The first indication is indicated using a smaller number of bits than a number of bits used to indicate the second indication.

14. The method according to claim 11, in, The first bit value of the first indication indicates that the UE cannot use a virtual port to transmit uplink communications using the maximum transmit power according to the power class of the UE, and The second bit value of the first indication indicates that the UE can use a virtual port to transmit uplink communications using the maximum transmit power according to the power class of the UE.

15. The method according to claim 11, in, The first bit value of the second indication indicates that the UE is unable to use a virtual port to transmit uplink communications using the maximum transmit power according to the power class of the UE, and The one or more other bit values ​​of the second indication indicate at least one of the following: which virtual port or ports the UE can use to transmit uplink communications using the maximum transmit power, or The number of virtual ports that the UE can use to transmit uplink communications using the maximum transmit power.

16. The method of claim 11, in, a first bit value of the second indication indicating that the UE is not capable of using a virtual port to transmit uplink communications using the maximum transmit power according to the power class of the UE, The second bit value of the second indication indicates that the UE can use only the first virtual port to transmit uplink communications using the maximum transmit power, wherein the third bit value of the second indication indicates that the UE can use only the second virtual port to transmit uplink communications using the maximum transmit power, and The fourth bit value of the second indication indicates that the UE can use both the first virtual port and the second virtual port to transmit uplink communications using the maximum transmit power.

17. A user equipment UE for wireless communication, include: Memory; as well as one or more processors operatively coupled to the memory, the memory and the one or more processors being configured to: transmitting to a network node an indication of whether the UE can use a virtual port to transmit uplink communications using a maximum transmit power according to a power class of the UE, wherein the virtual port is a combination of one or more antenna ports, and wherein the indication is based at least in part on an operating mode of the UE; and A sounding reference signal configuration is received from the network node based at least in part on the indication.

18. The UE according to claim 17, in, The operating mode is based at least in part on a number of actual transmit antenna ports used by the UE or a number of virtual transmit antenna ports used by the UE.

19. The UE according to claim 17, in, The indication comprises a first indication of a capability selected from a first set of capabilities based at least in part on the UE operating in a first operating mode, or wherein the indication comprises a second indication of a capability selected from a second set of capabilities based at least in part on the UE operating in a second operating mode.

20. The UE according to claim 19, in, The first mode of operation uses a fewer number of transmit antennas than a number of transmit antennas used for the second mode of operation.

21. The UE according to claim 19, in, The first indication is indicated using a smaller number of bits than a number of bits used to indicate the second indication.

22. The UE according to claim 19, in, The first bit value of the first indication indicates that the UE cannot use a virtual port to transmit uplink communications using the maximum transmit power according to the power class of the UE, and The second bit value of the first indication indicates that the UE can use a virtual port to transmit uplink communications using the maximum transmit power according to the power class of the UE.

23. The UE according to claim 19, in, The first bit value of the second indication indicates that the UE is unable to use a virtual port to transmit uplink communications using the maximum transmit power according to the power class of the UE, and The one or more other bit values ​​of the second indication indicate at least one of the following: which virtual port or ports the UE can use to transmit uplink communications using the maximum transmit power, or The number of virtual ports that the UE can use to transmit uplink communications using the maximum transmit power.

24. The UE according to claim 19, in, The first bit value of the second indication indicates that the UE is not able to use a virtual port to transmit uplink communication using the maximum transmit power according to the power class of the UE, wherein the second bit value of the second indication indicates that the UE is able to use only the first virtual port to transmit uplink communication using the maximum transmit power, wherein the third bit value of the second indication indicates that the UE is able to use only the second virtual port to transmit uplink communication using the maximum transmit power, and wherein the fourth bit value of the second indication indicates that the UE is able to use both the first virtual port and the second virtual port to transmit uplink communication using the maximum transmit power.

25. A network node for wireless communication, comprising: a memory; and one or more processors operatively coupled to the memory, the memory and the one or more processors being configured to: receive, from a user equipment UE, an indication as to whether the UE is able to use a virtual port to transmit uplink communication using the maximum transmit power according to the power class of the UE, wherein the virtual port is a combination of one or more antenna ports, and wherein the indication is at least partially based on an operation mode of the UE; and transmit a sounding reference signal configuration to the UE at least partially based on the indication.

26. The network node according to claim 25, wherein the operation mode is at least partially based on the actual number of transmit antenna ports used by the UE or the number of virtual transmit antenna ports used by the UE.

27. The network node according to claim 25, wherein the indication includes a first indication of an ability selected at least partially based on the UE operating in a first operation mode from a first set of capabilities, or wherein the indication includes a second indication of an ability selected at least partially based on the UE operating in a second operation mode from a second set of capabilities.

28. The network node according to claim 27, wherein the first operation mode uses a smaller number of transmit antennas than the number of transmit antennas used for the second operation mode.

29. The network node according to claim 27, wherein the first indication is indicated using a smaller number of bits than the number of bits used to indicate the second indication.

30. The network node according to claim 27, wherein the first bit value of the first indication indicates that the UE is not able to use a virtual port to transmit uplink communication using the maximum transmit power according to the power class of the UE, and wherein the second bit value of the first indication indicates that the UE is able to use a virtual port to transmit uplink communication using the maximum transmit power according to the power class of the UE.

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