Sounding Reference Signal Carrier Switching

Abstract

Techniques for reference signaling related to transmit power control for a communication device are discussed and provided. A user equipment (UE) receives one or more sounding reference signal (SRS) transmit power control (TPC) configurations for uplink carriers. The SRS TPC configuration may include a mapping from one uplink carrier to one or more component carrier sets. The UE receives downlink control information (DCI) from a monitoring cell, the DCI including a request for SRS transmission on an uplink carrier and / or a TPC command for SRS transmission on an uplink carrier. The UE determines an uplink carrier corresponding to the SRS request and / or TPC command based at least on a correspondence between the SRS TPC configuration and one or more uplink carriers or based on start bit information.

Description

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims the benefit of U.S. Provisional Application Serial No. 63 / 005,171, filed on April 3, 2020, and entitled “Sounding Reference Signal Carrier Switching,” and U.S. Patent Application No. 17 / 220,895, filed on April 1, 2021, and entitled “Sounding Reference Signal Carrier Switching,” the entire contents of which are expressly incorporated herein by reference. Technical Field

[0003] The present disclosure generally relates to wireless communications, and more particularly, to wireless communications including sounding reference signal (SRS) carrier switching. Various aspects and features may enable and provide efficient wireless communication techniques, an improved user experience, and wireless communication devices configured to perform improved SRS carrier switching at high data rates and improved processing time. Background Art

[0004] Wireless communication systems are widely deployed to provide a variety of telecommunication services, such as telephony, video, data, messaging, and broadcasting. Typical wireless communication systems may employ multiple access technologies capable of supporting communication with multiple users by sharing available system resources. 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, and time division synchronous code division multiple access (TD-SCDMA) systems.

[0005] These multiple access technologies have been adopted in various telecommunication standards to provide a common protocol that enables different wireless devices to communicate at municipal, national, regional and even global levels. An example of a telecommunication standard is 5G New Radio (NR). 5G NR is part of the continuous mobile broadband evolution released by the Third Generation Partnership Project (3GPP) to meet new requirements related to latency, reliability, security, scalability (e.g., Internet of Things (IoT)) and other requirements. 5G NR includes services associated with enhanced mobile broadband (eMBB), massive machine type communications (mMTC) and ultra-reliable low latency communications (URLLC). Some aspects of 5G NR may be based on the 4G Long Term Evolution (LTE) standard. Further improvements to 5G NR technology are needed. These improvements may also be applicable to other multiple access technologies and telecommunication standards that employ these technologies. Summary of the Invention

[0006] The following is a brief summary of one or more aspects in order to provide a basic understanding of such aspects. This summary is not an extensive overview of all contemplated aspects and is neither intended to identify key or critical elements of all aspects nor to delineate the scope of any or all aspects. Its sole purpose is to present some concepts of one or more aspects in a simplified form as a prelude to the more detailed description that will be presented later.

[0007] In one aspect of the present disclosure, methods, computer-readable media, and apparatus for wireless communications are provided. In some aspects, the method may be performed at a user equipment (UE). The apparatus receives one or more sounding reference signal (SRS) transmit power control (TPC) configurations for one or more uplink carriers. In some cases, each or some SRS TPC configurations may include a mapping from one uplink carrier to one or more component carrier (CC) sets. The apparatus may also determine a correspondence between each SRS TPC configuration and each uplink carrier. The apparatus receives downlink control information (DCI). The DCI may include at least one of a request for SRS transmission on one or more uplink carriers. Additionally and / or alternatively, the DCI may include one or more transmit power control (TPC) commands for the sounding reference signal (SRS) transmission. The SRS transmission may be on one or more uplink carriers. The apparatus may also determine one or more uplink carriers to which at least one of the SRS request or one or more TPC commands corresponds (e.g., based at least on the correspondence between multiple SRS TPC configurations and multiple uplink carriers). The apparatus may transmit the SRS on the one or more uplink carriers using the corresponding TPC commands. The UE may perform, for example, Type A SRS carrier switching.

[0008] In another aspect of the present disclosure, a method, computer-readable medium, and apparatus for wireless communication (e.g., at a UE and / or BS) are provided. The apparatus receives one or more SRS TPC configurations for multiple uplink carriers. The apparatus then receives a DCI including a request for SRS transmission on one or more uplink carriers or at least one of one or more TPC commands for SRS transmission on one or more uplink carriers. The apparatus may determine, based at least on start bit information, one or more uplink carriers corresponding to the SRS request or at least one of the one or more TPC commands. The apparatus then transmits the SRS on the one or more uplink carriers using the corresponding TPC commands. The UE may perform, for example, type B SRS carrier switching.

[0009] In another aspect of the present disclosure, a method, computer-readable medium, and apparatus for wireless communication (e.g., at a base station and / or a UE) are provided. The apparatus may send (e.g., to a UE) multiple SRS TPC configurations for one or more uplink carriers. Each or some SRS TPC configurations may include a mapping from one uplink carrier to one or more CC sets. In some cases, a correspondence may be provided between each SRS TPC configuration and each uplink carrier. The apparatus may send a DCI to the UE. The DCI may include at least one of a request for SRS transmission on one or more uplink carriers or one or more TPC commands for SRS transmission on one or more uplink carriers. In some scenarios, at least one of the SRS request or one or more TPC commands is applied to the uplink carrier (e.g., based at least on the correspondence between the one or more SRS TPC configurations and the one or more uplink carriers). The apparatus may then receive SRS on the one or more uplink carriers in response to the corresponding TPC command. The base station may configure the UE to perform, for example, Type A SRS carrier switching.

[0010] In another aspect of the present disclosure, a method, computer-readable medium, and apparatus for wireless communication (e.g., at a base station and / or UE) are provided. The apparatus may send (e.g., to a UE) one or more SRS TPC configurations for one or more uplink carriers and send a DCI to the UE. The DCI may include at least one of a request for SRS transmission on one or more uplink carriers or one or more TPC commands for SRS transmission on one or more uplink carriers. In some scenarios, the start bit of each of the one or more TPC commands may indicate the correspondence with a corresponding uplink carrier from a plurality of carriers. The apparatus may receive SRS on one or more uplink carriers in response to the corresponding TPC command. The base station may configure the UE to perform, for example, type B SRS carrier switching.

[0011] To accomplish the foregoing and related objectives, one or more aspects include the features hereinafter fully described and particularly pointed out in the claims. The following description and accompanying drawings set forth certain illustrative features of one or more aspects. However, these features are indicative of but some of the various ways in which the principles of various aspects may be employed, and this description is intended to include all such aspects and their equivalents. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 is a diagram illustrating an example of a wireless communication system and access network according to aspects of the present disclosure.

[0013] Figure 2A、 2B 2C, 2D are schematic diagrams showing examples of a first 5G / NR frame, a downlink channel within a 5G / NR subframe, a second 5G / NR frame, and an uplink channel within a 5G / NR subframe, respectively.

[0014] Figure 3 is a schematic diagram illustrating an example of a base station and a user equipment (UE) in an access network according to aspects of the present disclosure.

[0015] Figure 4 is an example communication flow between a UE and a base station including SRS carrier switching according to aspects of the present disclosure.

[0016] Figure 5 is an example communication flow between a UE and a base station including SRS carrier switching according to aspects of the present disclosure.

[0017] Figure 6 is a flow chart of a wireless communication method at a UE including SRS carrier switching according to aspects of the present disclosure.

[0018] Figure 7 is a flow chart of a wireless communication method at a UE including SRS carrier switching according to aspects of the present disclosure.

[0019] Figure 8 is a flow chart of a wireless communication method at a base station including SRS carrier switching according to aspects of the present disclosure.

[0020] Figure 9 is a flow chart of a wireless communication method at a base station including SRS carrier switching according to aspects of the present disclosure.

[0021] Figure 10 is a diagram illustrating an example of a hardware implementation for an example apparatus configured to perform SRS carrier switching according to aspects of the present disclosure.

[0022] Figure 11 is a diagram illustrating an example of a hardware implementation of an example apparatus having aspects to configure a UE to perform SRS carrier switching in accordance with aspects of the present disclosure. DETAILED DESCRIPTION

[0023] The detailed description set forth below in conjunction with the accompanying drawings is intended as a description of various configurations and is not intended to represent the only configurations in which the concepts described herein may be practiced. For the purpose of providing a comprehensive understanding of the various concepts, the detailed description includes specific details. However, it will be apparent to those skilled in the art that these concepts may be practiced without these specific details. In some instances, well-known structures and components are shown in block diagram form to avoid obscuring such concepts.

[0024] Several aspects of telecommunications systems will now be presented with reference to various apparatuses and methods. These apparatuses and methods will be described in the following detailed description by means of various blocks, components, circuits, processes, algorithms, etc. (collectively referred to as "elements") and illustrated in the accompanying drawings. These elements may be implemented using electronic hardware, computer software, or any 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.

[0025] By way of example, an element, or any part of an element, or any combination of elements, can be implemented as a "processing system" comprising one or more processors. Examples of processors include microprocessors, microcontrollers, graphics processing units (GPUs), central processing units (CPUs), application processors, digital signal processors (DSPs), reduced instruction set computing (RISC) processors, systems on chip (SoCs), baseband processors, field programmable gate arrays (FPGAs), programmable logic devices (PLDs), state machines, gating logic, discrete hardware circuits, and other suitable hardware configured to perform the various functions described throughout this disclosure. One or more processors in a processing system can execute software. Whether referred to as software, firmware, middleware, microcode, hardware description language, or other names, software should be broadly interpreted as meaning instructions, instruction sets, codes, code segments, program codes, programs, subroutines, software components, applications, software applications, software packages, routines, subroutines, objects, executable files, threads of execution, processes, functions, etc.

[0026] Accordingly, in one or more exemplary embodiments, the functions described can be implemented in hardware, software, or any combination thereof. If implemented in software, the functions can be stored or encoded as one or more instructions or codes on a computer-readable medium. Computer-readable media include computer storage media. Storage media can be any available media that can be accessed by a computer. By way of example and not limitation, such computer-readable media can include random access memory (RAM), read-only memory (ROM), electrically erasable programmable ROM (EEPROM), optical disk storage, magnetic disk storage, other magnetic storage devices, a combination of computer-readable media of the type described, or any other medium that can be used to store computer-executable code in the form of instructions or data structures that can be accessed by a computer.

[0027] Although various aspects and embodiments are described in this application by illustrating some examples, it will be understood by those skilled in the art that additional implementation schemes and use cases can appear in many different arrangements and scenarios. The innovative solutions described herein can be implemented on many different platform types, devices, systems, shapes, sizes, and packaging arrangements. For example, embodiments and / or uses can be implemented via integrated chip embodiments and other devices based on non-module components (e.g., end-user devices, vehicles, communication devices, computing devices, industrial equipment, retail / purchasing equipment, medical equipment, devices supporting artificial intelligence (AI), etc.). Although some examples may or may not be specifically for use cases or applications, a variety of applicability of the described innovative solutions can occur. The scope of implementation schemes can be extended from chip-level or modular components to non-modular, non-chip-level implementation schemes, and further to aggregated, distributed, or OEM devices or systems that include one or more aspects of the described innovative solutions. In some actual settings, the devices including the described aspects and features may also necessarily include additional components and features for implementing and enforcing the claimed and described embodiments. For example, the transmission and reception of wireless signals necessarily include several components for analog and digital purposes (e.g., hardware components including antennas, RF chains, power amplifiers, modulators, buffers, processors, interleavers, adders / summers, etc.). It is contemplated that the innovations described herein can be implemented in a variety of devices, chip-level components, systems, distributed arrangements, end-user devices, etc., of varying sizes, shapes, and structures.

[0028] Figure 1is a diagram illustrating an example of a wireless communication system and access network 100 including a UE 104 and a base station 102 or 180. The base station 102 / 180 can configure the UE 104 for SRS carrier switching. Various aspects presented herein enable the UE 104 to receive DCI from a monitoring cell, the DCI including a request for SRS transmission on different uplink carriers and / or a TPC command for SRS transmission on different uplink carriers, to more accurately identify the uplink carrier to which the SRS request and / or TPC command applies. Carrier switching techniques and configurations can be pre-set, can be device-specific, can take into account operational objectives, and can be specified in standards. The techniques discussed herein can include various carrier switching methods and deployments.

[0029] In some examples, UE 104 can be configured for Type A carrier switching, such as in conjunction with Figure 4 In more detail, the UE may include a carrier determination component 198. In some aspects, the carrier determination component 198 may be configured to receive multiple SRS TPC configurations for Type A SRS carrier switching. The SRS TPC configurations may be for multiple uplink carriers, where each SRS TPC configuration includes a mapping from one uplink carrier to one or more CC sets. The carrier determination component 198 may be configured to determine a correspondence relationship between each SRS TPC configuration and each uplink carrier. The UE 104 may receive DCI from a monitoring cell, the DCI including at least one of a request for SRS transmission on one or more uplink carriers or one or more TPC commands for SRS transmission on one or more uplink carriers. The carrier determination component 198 may be configured to determine, based at least on the correspondence relationship between the multiple SRS TPC configurations and the multiple uplink carriers, one or more uplink carriers from the multiple carriers to which the at least one of the SRS request or the one or more TPC commands corresponds. The UE 104 may then transmit the SRS on the one or more uplink carriers using the corresponding TPC commands.

[0030] Similarly, base station 102 or 180 may include an SRS carrier switching configuration component 199 that configures UE 104, for example, for Type A SRS carrier switching. SRS carrier switching configuration component 199 may be configured to send a plurality of SRS TPC configurations for a plurality of uplink carriers to the UE, wherein each SRS TPC configuration includes a mapping from one uplink carrier to one or more CC sets, wherein a correspondence relationship is provided between each SRS-TPC configuration and each uplink carrier. SRS carrier switching configuration component 199 may also be configured to send a DCI to the UE on a monitoring cell, the DCI including at least one of a request for SRS transmission on the one or more uplink carriers or a TPC command for SRS transmission on the one or more uplink carriers, wherein at least one of the SRS request or the one or more TPC commands applies to the uplink carriers based at least on the correspondence relationship between the plurality of SRS TPC configurations and the plurality of uplink carriers. Base station 102 or 180 may then receive SRS on the one or more uplink carriers in response to the corresponding TPC command.

[0031] In some examples, UE 104 can be configured for Type B carrier switching, such as in conjunction with Figure 5 Described in more detail. In this example, the carrier determination component 198 can be configured to receive multiple SRS TPC configurations for multiple uplink carriers. The carrier determination component 198 can be configured to receive DCI from a monitoring cell, the DCI including at least one of a request for SRS transmission on one or more uplink carriers or one or more TPC commands for SRS transmission on one or more uplink carriers. The carrier determination component 198 can be configured to determine, based at least on the start bit information, one or more uplink carriers from the multiple carriers to which the SRS request or at least one of the one or more TPC commands corresponds. The UE 104 can then use the corresponding TPC command to send SRS on the one or more uplink carriers.

[0032] Similarly, SRS carrier switching configuration component 199 can configure UE 104, for example, for Type B SRS carrier switching. In this example, SRS carrier switching configuration component 199 can be configured to send a plurality of SRS TPC configurations for a plurality of uplink carriers to the UE, wherein each SRS TPC configuration includes a mapping from one uplink carrier to one or more CC sets, wherein a correspondence relationship is provided between each SRS TPC configuration and each uplink carrier. SRS carrier switching configuration component 199 can be configured to send a DCI to the UE on a monitoring cell, the DCI including at least one of a request for SRS transmission on one or more uplink carriers or one or more TPC commands for SRS transmission on one or more uplink carriers, wherein the SRS request or at least one of the one or more TPC commands applies to the uplink carriers based at least on the correspondence relationship between the plurality of SRS TPC configurations and the plurality of uplink carriers. Base station 102 or 180 can then receive SRS from UE 104 on the one or more uplink carriers in response to the corresponding TPC commands.

[0033] The wireless communication system (also referred to as a wireless wide area network (WWAN)) includes a base station 102, a UE 104, an evolved packet core (EPC) 160, and another core network 190 (e.g., a 5G core (5GC)). The base station 102 may include a macro cell (a high-power cellular base station) and / or a small cell (a low-power cellular base station). A macro cell includes a base station. A small cell includes a femto cell, a pico cell, and a micro cell.

[0034] A base station 102 configured for 4G LTE (collectively referred to as the Evolved Universal Mobile Telecommunications System (UMTS) Terrestrial Radio Access Network (E-UTRAN)) can interface with the EPC 160 via a first backhaul link 132 (such as an S1 interface). A base station 102 configured for 5G NR (collectively referred to as the Next Generation RAN (NG-RAN)) can interface with the core network 190 via a second backhaul link 184. Among other functions, the base station 102 can also perform one or more of the following functions: transmission of user data, radio channel encryption and decryption, integrity protection, header compression, mobility control functions (e.g., handover, dual connectivity), inter-cell interference coordination, connection establishment and release, load balancing, distribution of non-access stratum (NAS) messages, NAS node selection, synchronization, radio access network (RAN) sharing, multimedia broadcast multicast service (MBMS), user and device tracking, RAN information management (RIM), paging, positioning, and delivery of warning messages. The base stations 102 can communicate with each other directly or indirectly (eg, through the EPC 160 or the core network 190) via a third backhaul link 134 (eg, an X2 interface). The third backhaul link 134 can be wired or wireless.

[0035] Base stations 102 can communicate wirelessly with UEs 104. Each of base stations 102 can provide communication coverage for a corresponding geographic coverage area 110. There can be overlapping geographic coverage areas 110. For example, a small cell 102′ can have a coverage area 110′ that overlaps with the coverage area 110 of one or more macro base stations 102. A network that includes both small cells and macro cells can be referred to as a heterogeneous network. A heterogeneous network can also include home evolved Node Bs (eNBs) (HeNBs), which can provide services to a restricted group called a closed subscriber group (CSG). The communication link 120 between base station 102 and UE 104 can include uplink (UL) (also known as reverse link) transmissions from UE 104 to base station 102 and / or downlink (DL) (also known as forward link) transmissions from base station 102 to UE 104. The communication link 120 can use multiple-input multiple-output (MIMO) antenna technology, including spatial multiplexing, beamforming, and / or transmit diversity. The communication link may be through one or more carriers. The base station 102 / UE 104 may use a spectrum of up to Y MHz (e.g., 5, 10, 15, 20, 100, 400, etc. MHz) bandwidth per carrier allocated in a carrier aggregation of up to Yx MHz (x component carriers) for transmission in each direction. The carriers may be adjacent to each other or may not be adjacent to each other. The allocation of carriers may be asymmetric with respect to the downlink (DL) and uplink (UL) (e.g., more or fewer carriers may be allocated for DL ​​than for UL). The component carrier may include a primary component carrier and one or more secondary component carriers. The primary component carrier may be referred to as a primary cell (PCell), and the secondary component carrier may be referred to as a secondary cell (SCell).

[0036] Some UEs 104 can communicate with each other using device-to-device (D2D) communication links 158. The D2D communication links 158 can use the DL / UL WWAN spectrum. The D2D communication links 158 can use one or more sidelink channels, such as a physical sidelink broadcast channel (PSBCH), a physical sidelink discovery channel (PSDCH), a physical sidelink shared channel (PSSCH), and a physical sidelink control channel (PSCCH). D2D communication can be achieved through various wireless D2D communication systems, such as, for example, WiMedia, Bluetooth, ZigBee, Wi-Fi based on the Institute of Electrical and Electronics Engineers (IEEE) 802.11 standard, LTE, or NR.

[0037] The wireless communication system may also include a Wi-Fi access point (AP) 150 that communicates with a Wi-Fi station (STA) 152 in the 5 GHz unlicensed spectrum via a communication link 154. When communicating in the unlicensed spectrum, the STA 152 / AP 150 may perform a clear channel assessment (CCA) to determine whether the channel is available before communicating.

[0038] The small cell 102′ can operate in a licensed spectrum and / or an unlicensed spectrum. When operating in an unlicensed spectrum, the small cell 102′ can employ NR and use the same 5 GHz unlicensed spectrum as used by the Wi-Fi AP 150. The small cell 102′ employing NR in the unlicensed spectrum can improve access network coverage and / or increase access network capacity.

[0039] The electromagnetic spectrum is typically subdivided into various categories, bands, channels, etc. based on frequency / wavelength. In 5G NR, two initial operating bands have been identified with the frequency range names FR1 (410 MHz - 7.125 GHz) and FR2 (24.25 GHz - 52.6 GHz). Although a portion of FR1 is greater than 6 GHz, FR1 is often (interchangeably) referred to as the "sub-6 GHz" band in various documents and articles. Similar naming issues sometimes arise with respect to FR2, which is often (interchangeably) referred to as the "millimeter wave" band in documents and articles, although it is different from the extremely high frequency (EHF) band (30 GHz - 300 GHz), which is identified as the "millimeter wave" band by the International Telecommunication Union (ITU).

[0040] Frequencies between FR1 and FR2 are generally referred to as mid-band frequencies. Recent 5G NR research has identified the operating bands of these mid-band frequencies as the frequency range designation FR3 (7.125 GHz–24.25 GHz). Frequency bands falling within FR3 can inherit FR1 characteristics and / or FR2 characteristics, and thus can effectively extend the characteristics of FR1 and / or FR2 to mid-band frequencies. In addition, higher frequency bands are currently being explored to extend 5G NR operation above 52.6 GHz. For example, three higher operating bands have been identified with the frequency range designations FR4a or FR4-1 (52.6 GHz–71 GHz), FR4 (52.6 GHz–114.25 GHz), and FR5 (114.25 GHz–300 GHz). Each of these higher frequency bands falls within the EHF band.

[0041] In view of the above, unless otherwise specified, it should be understood that if the term "sbu-6GHz" or the like is used herein, it can be broadly referred to as a frequency that may be less than 6GHz, may be within FR1, or may include mid-band frequencies. In addition, unless otherwise specified, it should be understood that if the term "millimeter wave" or the like is used herein, it can be broadly referred to as a frequency that may include mid-band frequencies, may be within FR2, FR4, FR4-a or FR4-1 and / or FR5, or may be within the EHF band.

[0042] Base station 102 (whether a small cell 102′ or a large cell (e.g., a macro base station)) may include or be referred to as an eNB, gNodeB (gNB), or another type of base station. Some base stations, such as gNB 180, may operate in the traditional sub-6 GHz spectrum, in millimeter wave (mmW) frequencies, or in near-mmW frequencies to communicate with UE 104. When gNB 180 operates in mmW or near-mmW frequencies, gNB 180 may be referred to as a mmW base station. Extremely high frequency (EHF) is a portion of the RF spectrum in the electromagnetic spectrum. EHF ranges from 30 GHz to 300 GHz, with wavelengths between 1 mm and 10 mm. Radio waves in this band may be referred to as millimeter waves. Near-mmW can extend down to frequencies of 3 GHz, with wavelengths of 100 mm. Super high frequency (SHF) bands extend between 3 GHz and 30 GHz and are also referred to as centimeter waves. Communications using the mmW / near-mmW radio frequency (RF) bands (e.g., 3 GHz-300 GHz) have extremely high path loss and short range. The mmW base station 180 may utilize beamforming 182 with the UE 104 to compensate for the extremely high path loss and short range. The base station 180 and the UE 104 may each include multiple antennas, such as antenna elements, antenna panels, or antenna arrays to facilitate beamforming.

[0043] Base station 180 may transmit beamformed signals in one or more transmit directions 182′ to UE 104. UE 104 may receive beamformed signals from base station 180 in one or more receive directions 182″. UE 104 may also transmit beamformed signals in one or more transmit directions to base station 180. Base station 180 may receive beamformed signals in one or more receive directions from UE 104. Base station 180 / UE 104 may perform beam training to determine optimal receive and transmit directions for each of base station 180 / UE 104. The transmit direction and receive direction for base station 180 may be the same or different. The transmit direction and receive direction for UE 104 may be the same or different.

[0044] EPC 160 may include a Mobility Management Entity (MME) 162, other MMEs 164, a Serving Gateway 166, a Multimedia Broadcast Multicast Service (MBMS) Gateway 168, a Broadcast Multicast Service Center (BM-SC) 170, and a Packet Data Network (PDN) Gateway 172. MME 162 may communicate with a Home Subscriber Server (HSS) 174. MME 162 is a control node that handles signaling between UE 104 and EPC 160. Generally, MME 162 provides bearer and connection management. All user Internet Protocol (IP) packets are transferred through Serving Gateway 166, which itself is connected to PDN Gateway 172. PDN Gateway 172 provides IP address allocation and other functions to UEs. PDN Gateway 172 and BM-SC 170 are connected to IP Services 176. IP Services 176 may include the Internet, an intranet, an IP Multimedia Subsystem (IMS), PS streaming services, and / or other IP services. The BM-SC 170 may provide functionality for MBMS user service provision and delivery. The BM-SC 170 may serve as an entry point for content provider MBMS transmissions, may be used to admit and initiate MBMS bearer services within a public land mobile network (PLMN), and may be used to schedule MBMS transmissions. The MBMS gateway 168 may be used to distribute MBMS services to base stations 102 belonging to a multicast broadcast single frequency network (MBSFN) area broadcasting a particular service, and may be responsible for session management (start / stop) and collecting eMBMS-related billing information.

[0045] The core network 190 may include an access and mobility management function (AMF) 192, other AMFs 193, a session management function (SMF) 194, and a user plane function (UPF) 195. The AMF 192 may communicate with a unified data management (UDM) 196. The AMF 192 is a control node that handles signaling between the UE 104 and the core network 190. Generally, the AMF 192 provides QoS flow and session management. All user Internet Protocol (IP) packets are transported through the UPF 195. The UPF 195 provides UE IP address allocation and other functions. The UPF 195 is connected to the IP services 197. The IP services 197 may include the Internet, an intranet, an IP multimedia subsystem (IMS), packet switched (PS) stream (PSS) services, and / or other IP services.

[0046] A base station may include and / or be referred to as a gNB, a Node B, an eNB, an access point, a base transceiver station, a radio base station, a radio transceiver, a transceiver function, a basic service set (BSS), an extended service set (ESS), a transmit reception point (TRP), or some other appropriate terminology. Base station 102 provides an access point to EPC 160 or core network 190 for UE 104. Examples of UE 104 include a cellular phone, a smartphone, a Session Initiation Protocol (SIP) phone, a laptop, a personal digital assistant (PDA), a satellite radio unit, a global positioning system, a multimedia device, a video device, a digital audio player (e.g., an MP3 player), a camera, a game console, a tablet device, a smart device, a wearable device, a vehicle, an electric meter, a gas pump, a large or small kitchen appliance, a healthcare device, an implant, a sensor / actuator, a display, or any other similarly functional device. Some of UE 104 may be referred to as IoT devices (e.g., a parking meter, a gas pump, an oven, a vehicle, a heart monitor, etc.). UE 104 may also be referred to as a station, a mobile station, a user station, a mobile unit, a user unit, a wireless unit, a remote unit, a mobile device, a wireless device, a wireless communication device, a remote device, a mobile user station, an access terminal, a mobile terminal, a wireless terminal, a remote terminal, a handheld device, a user agent, a mobile client, a client, or some other appropriate terminology.

[0047] Although the following description may focus on 5G NR, the concepts described herein may be applicable to other similar areas such as LTE, LTE-A, CDMA, GSM, and other wireless technologies.

[0048] Figure 2A is a diagram 200 illustrating an example of a first subframe within a 5G NR frame structure. Figure 2B is a diagram 230 illustrating an example of DL channels within a 5G NR subframe. Figure 2C is a diagram 250 illustrating an example of a second subframe within a 5G NR frame structure. Figure 2D is a diagram 280 illustrating an example of UL channels within a 5G NR subframe.

[0049] like Figures 2A-2D As shown in , the 5G NR frame structure can be frequency division multiplexing (FDD) (wherein, for a particular set of subcarriers (carrier system bandwidth), subframes within a subcarrier set are dedicated to either DL or UL), or can be time division multiplexing (TDD) (wherein, for a particular set of subcarriers (carrier system bandwidth), subframes within a subcarrier set are dedicated to both DL and UL). Figure 2A 、 2CIn the example provided, the 5G NR frame structure is assumed to be TDD, where subframe 4 is configured with slot format 28 (most of which are DL), where D is DL, U is UL, and X is flexible between DL / UL, and subframe 3 is configured with slot format 34 (most of which are UL). Although subframes 3 and 4 are shown as having slot formats 34 and 28, respectively, any particular subframe can be configured with any of the various available slot formats 0-61. Slot formats 0 and 1 are full DL and full UL, respectively. Other slot formats 2-61 include a mix of DL, UL, and flexible symbols. The UE is configured with the slot format (dynamically configured via DL control information (DCI) or semi-statically / statically configured via radio resource control (RRC) signaling) via the received slot format indicator (SFI). The example description also applies to the 5G NR frame structure for TDD.

[0050] A frame (10ms) can be divided into 10 equally sized subframes (1ms). Each subframe can include one or more time slots. A subframe can also include mini-slots, which can include 7, 4, or 2 symbols. Each time slot can include 7 or 14 symbols, depending on the time slot configuration. For time slot configuration 0, each time slot can include 14 symbols, and for time slot configuration 1, each time slot can include 7 symbols. The symbols on the DL can be cyclic prefix (CP) OFDM (CP-OFDM) symbols. The symbols on the UL can be CP-OFDM symbols (for high throughput scenarios) or discrete Fourier transform (DFT) spread OFDM (DFT-s-OFDM) symbols (also known as single carrier frequency division multiple access (SC-FDMA) symbols) (for power-limited scenarios; limited to single stream transmission). The number of time slots within a subframe can be based on the time slot configuration and numerology. For slot configuration 0, different digital schemes μ0 to 5 allow 1, 2, 4, 8, 16, and 32 slots per subframe, respectively. For slot configuration 1, different digital schemes 0 to 2 allow 2, 4, and 8 slots per subframe, respectively. Accordingly, for slot configuration 0 and digital scheme μ, there are 14 symbols / slot and 2 μ time slots / subframes. The subcarrier spacing and symbol length / duration are functions of the digital scheme. The subcarrier spacing can be equal to 2 μ *15kHz, where μ is the digital scheme 0 to 5. Thus, digital scheme μ=0 has a subcarrier spacing of 15kHz, and digital scheme μ=5 has a subcarrier spacing of 480kHz. The symbol length / duration is inversely related to the subcarrier spacing. Figures 2A-2DAn example is provided for slot configuration 0 (14 symbols per slot) and digital scheme μ=2 (4 slots per subframe). The slot duration is 0.25 ms, the subcarrier spacing is 60 kHz, and the symbol duration is approximately 16.67 μs. Figures 2A-2D Example aspects of the frame structure and example channels for 5G NR are shown. Other wireless communication technologies may have different frame structures and / or different channels, and the aspects disclosed herein are not limited to application to 5G NR. Figures 2A-2D The frame structure in .

[0051] The resource grid can be used to represent the frame structure. Each time slot includes a resource block (RB) (also called a physical RB (PRB)), which includes 12 consecutive subcarriers. The resource grid is divided into multiple resource elements (REs). The number of bits carried by each RE depends on the modulation scheme.

[0052] As in Figure 2A As shown in , some of the REs carry reference (pilot) signals (RS) for the UE. The RS may include a demodulation RS (DM-RS) for channel estimation at the UE (indicated as R for a specific configuration). x , where 100x is the port number, but other DM-RS configurations are possible) and channel state information reference signal (CSI-RS). RS may also include beam measurement RS (BRS), beam refinement RS (BRRS), and phase tracking RS (PT-RS).

[0053] Figure 2B Examples of various DL channels within a subframe of a frame are shown. The physical downlink control channel (PDCCH) carries DCI within one or more control channel elements (CCEs), each CCE includes nine RE groups (REGs), and each REG includes four consecutive REs in one OFDM symbol. The primary synchronization signal (PSS) can be within symbol 2 of a specific subframe of the frame. The PSS is used by the UE 104 to determine the subframe / symbol timing and the physical layer identification. The secondary synchronization signal (SSS) can be within symbol 4 of a specific subframe of the frame. The SSS is used by the UE to determine the physical layer cell identification group number and the radio frame timing. Based on the physical layer identification and the physical layer cell identification group number, the UE can determine the physical cell identifier (PCI). Based on the PCI, the UE can determine the location of the DM-RS. The physical broadcast channel (PBCH) carrying the master information block (MIB) can be logically grouped with the PSS and SSS to form a synchronization signal (SS) / PBCH block. The MIB provides the number of RBs in the system bandwidth and the system frame number (SFN). The Physical Downlink Shared Channel (PDSCH) carries user data, broadcast system information (eg, System Information Block (SIB)) that is not transmitted through the PBCH, and paging messages.

[0054] As in Figure 2C As shown in , some of the REs carry DM-RSs for channel estimation at the base station (indicated as R for one specific configuration, but other DM-RS configurations are possible). The UE may send DM-RSs for the physical uplink control channel (PUCCH) and DM-RSs for the physical uplink shared channel (PUSCH). The PUSCH DM-RS may be sent in the first one or two symbols of the PUSCH. The PUCCH DM-RS may be sent in different configurations depending on whether a short PUCCH or a long PUCCH is sent and depending on the specific PUCCH format used. The UE may send a sounding reference signal (SRS). The SRS may be sent in the last symbol of the subframe. The SRS may have a comb structure, and the UE may send the SRS on one of the comb structures. The SRS may be used by the base station for channel quality estimation to enable frequency-dependent scheduling on the UL.

[0055] Figure 2D An example of various UL channels within a subframe of a frame is shown. The PUCCH may be positioned as indicated in one configuration. The PUCCH carries uplink control information (UCI), such as scheduling requests, channel quality indicator (CQI), precoding matrix indicator (PMI), rank indicator (RI), and hybrid automatic repeat request (HARQ) ACK / NACK feedback. The PUSCH carries data and may additionally be used to carry buffer status reports (BSRs), power headroom reports (PHRs), and / or UCI.

[0056] Figure 33 is a block diagram of a base station 310 communicating with a UE 350 in an access network. In the DL, IP packets from the EPC 160 may be provided to the controller / processor 375. The controller / processor 375 implements layer 3 and layer 2 functions. Layer 3 includes the radio resource control (RRC) layer, and layer 2 includes the service data adaptation protocol (SDAP) layer, the packet data convergence protocol (PDCP) layer, the radio link control (RLC) layer, and the medium access control (MAC) layer. The controller / processor 375 provides: RRC layer functions associated with the following: broadcast of system information (e.g., MIB, SIB), RRC connection control (e.g., RRC connection paging, RRC connection establishment, RRC connection modification, and RRC connection release), inter-radio access technology (RAT) mobility, and measurement configuration for UE measurement reporting; PDCP layer functions associated with the following: header compression / decompression, security (ciphering, deciphering, integrity protection, integrity verification), and handover support functions; RLC layer functions associated with the following: transmission of upper layer packet data units (PDUs), error correction through ARQ, concatenation, segmentation and reassembly of RLC service data units (SDUs), resegmentation of RLC data PDUs, and reordering of RLC data PDUs; and MAC layer functions associated with the following: mapping between logical channels and transport channels, multiplexing of MAC SDUs onto transport blocks (TBs), demultiplexing of MAC SDUs from TBs, scheduling information reporting, error correction through HARQ, priority handling, and logical channel prioritization.

[0057] The transmit (TX) processor 316 and receive (RX) processor 370 implement layer 1 functions associated with various signal processing functions. Layer 1, including the physical (PHY) layer, may include error detection for transmission channels, forward error correction (FEC) encoding / decoding for transmission channels, interleaving, rate matching, mapping onto physical channels, modulation / demodulation of physical channels, and MIMO antenna processing. The TX processor 316 handles the mapping to the signal constellation based on various modulation schemes (e.g., binary phase shift keying (BPSK), quadrature phase shift keying (QPSK), M-phase shift keying (M-PSK), and M-order quadrature amplitude modulation (M-QAM)). The coded and modulated symbols can then be divided into parallel streams. Each stream can then be mapped to an OFDM subcarrier, multiplexed with a reference signal (e.g., a pilot) in the time and / or frequency domain, and then combined using an inverse fast Fourier transform (IFFT) to produce a physical channel carrying a time-domain OFDM symbol stream. The OFDM stream is spatially precoded to produce multiple spatial streams. The channel estimate from the channel estimator 374 may be used to determine the coding and modulation schemes, as well as for spatial processing. The channel estimate may be derived based on a reference signal and / or channel condition feedback transmitted by the UE 350. Each spatial stream may then be provided to a different antenna 320 via a separate transmitter 318TX. Each transmitter 318TX may modulate an RF carrier with a corresponding spatial stream for transmission.

[0058] At the UE 350, each receiver 354RX receives a signal via its respective antenna 352. Each receiver 354RX recovers the information modulated onto the RF carrier and provides the information to a receive (RX) processor 356. The TX processor 368 and the RX processor 356 implement layer 1 functions associated with various signal processing functions. The RX processor 356 can perform spatial processing on the information to recover any spatial streams destined for the UE 350. If multiple spatial streams are destined for the UE 350, they can be combined into a single OFDM symbol stream by the RX processor 356. The RX processor 356 then converts the OFDM symbol stream from the time domain to the frequency domain using a fast Fourier transform (FFT). The frequency domain signal includes a separate OFDM symbol stream for each subcarrier of the OFDM signal. The symbols and reference signals on each subcarrier are recovered and demodulated by determining the most likely signal constellation point transmitted by the base station 310. These soft decisions can be based on channel estimates calculated by the channel estimator 358. The soft decisions are then decoded and deinterleaved to recover the data and control signals originally sent on the physical channel by base station 310. The data and control signals are then provided to controller / processor 359 which implements layer 3 and layer 2 functionality.

[0059] The controller / processor 359 may be associated with a memory 360 that stores program codes and data. The memory 360 may be referred to as a computer-readable medium. In the UL, the controller / processor 359 provides demultiplexing between transport and logical channels, packet reassembly, decryption, header decompression, and control signal processing to recover IP packets from the EPC 160. The controller / processor 359 is also responsible for error detection using ACK and / or NACK protocols to support HARQ operations.

[0060] Similar to the functions described in conjunction with DL transmissions performed by the base station 310, the controller / processor 359 provides RRC layer functions associated with system information (e.g., MIB, SIB) acquisition, RRC connection, and measurement reporting; PDCP layer functions associated with header compression / decompression, and security (encryption, decryption, integrity protection, integrity verification); RLC layer functions associated with transmission of upper layer PDUs, error correction through ARQ, concatenation, segmentation and reassembly of RLC SDUs, resegmentation of RLC data PDUs, and reordering of RLC data PDUs; and MAC layer functions associated with mapping between logical channels and transport channels, multiplexing of MAC SDUs onto TBs, demultiplexing of MAC SDUs from TBs, scheduling information reporting, error correction through HARQ, priority processing, and logical channel prioritization.

[0061] Channel estimates derived by the channel estimator 358 based on a reference signal or feedback transmitted by the base station 310 may be used by the TX processor 368 to select an appropriate coding and modulation scheme and to facilitate spatial processing. The spatial streams generated by the TX processor 368 may be provided to different antennas 352 via separate transmitters 354TX. Each transmitter 354TX may modulate an RF carrier with a corresponding spatial stream for transmission.

[0062] UL transmissions are processed at the base station 310 in a manner similar to that described in conjunction with the receiver functionality at the UE 350. Each receiver 318RX receives a signal through its respective antenna 320. Each receiver 318RX recovers information modulated onto an RF carrier and provides the information to the RX processor 370.

[0063] The controller / processor 375 may be associated with a memory 376 that stores program codes and data. The memory 376 may be referred to as a computer-readable medium. In the UL, the controller / processor 375 provides demultiplexing between transport and logical channels, packet reassembly, decryption, header decompression, and control signal processing to recover IP packets from the UE 350. The IP packets from the controller / processor 375 may be provided to the EPC 160. The controller / processor 375 is also responsible for error detection using an ACK and / or NACK protocol to support HARQ operations.

[0064] At least one of the TX processor 368, the RX processor 356, and the controller / processor 359 may be configured to perform operations related to Figure 1 198 related aspects.

[0065] At least one of the TX processor 316, the RX processor 370, and the controller / processor 375 may be configured to perform operations related to Figure 1 199 related aspects.

[0066] The UE may transmit an SRS, which the base station may use to measure uplink channel characteristics, such as uplink channel quality. The base station may use the measurement results of the SRS transmitted by the UE to determine aspects of uplink scheduling, link adaptation, and / or downlink scheduling. The base station may configure one or more parameters for SRS transmission in RRC signaling to the UE. The UE may transmit the SRS using time and / or frequency resources, transmission mode, etc. based on the RRC configuration from the base station. The UE may receive a cell-specific SRS configuration and / or a UE-specific SRS configuration. The cell-specific configuration may indicate which subframes the UE may use for SRS transmission within the cell. The UE may support carrier aggregation (CA). The allocation of carriers may be asymmetric with respect to support for downlink and uplink (e.g., more or fewer carriers may be allocated for downlink communications than for uplink communications). A component carrier may include a primary component carrier and one or more secondary component carriers. The primary component carrier may be referred to as a primary cell (PCell), and the secondary component carrier may be referred to as a secondary cell (SCell). As used herein, the term carrier may be used interchangeably with the term "component carrier" or "CC." Additionally, the term "carrier" may be used to refer to a "cell."

[0067] A UE may be triggered in one carrier (e.g., a downlink carrier) to transmit an SRS in another carrier (e.g., an uplink carrier). In some scenarios, the UE may switch to another carrier to transmit the SRS. Switching from the first carrier on which the SRS is triggered to transmitting the SRS on another carrier may generally be referred to as SRS carrier switching. Providing a trigger in an alternating or different carrier for receiving a reference signal via one or more different carriers enables the reference signal to be provided quickly and efficiently. Various switching methods may be implemented according to the techniques discussed herein.

[0068] As a specific example, the first carrier on which the UE receives the trigger may not include PUCCH and / or PUSCH. For example, the base station may configure the UE for SRS carrier switching when PUSCH is not configured, and / or configure SRS power control independent of PUSCH power control.

[0069] In another specific example, a TPC command may be provided to a UE on one carrier for use on another carrier. The base station may configure the UE for different types of SRS carrier switching. For example, the base station may configure the UE for Type A SRS carrier switching and / or Type B SRS carrier switching. The base station may provide a parameter to the UE to indicate the type of SRS carrier switching.

[0070] In some aspects, a base station may configure a UE for type A SRS carrier switching and / or type B SRS carrier switching. For example, the base station may configure the UE with higher-layer parameters indicating type A or type B. An example of a parameter may include an SRS TPC PDCCH group to indicate type A SRS carrier switching (e.g., srs-TPC-PDCCH-Group=typeA) or type B SRS carrier switching (e.g., srs-TPC-PDCCH-Group=typeB).

[0071] Table 1 shows an example of SRS request fields that a base station may send and corresponding SRS resources for a UE for Type A and Type BSRS carrier switching triggers. The specific parameter names shown in Table 1 are merely examples to illustrate the disclosed concepts.

[0072] Table 1

[0073]

[0074] In some deployments, when a base station sends a set of TPC commands to a UE, the UE may not be able to determine which carrier corresponds to a particular TPC command. Various aspects presented herein enable the UE to determine a correspondence relationship that enables the UE to determine the correspondence between the TPC command and a particular uplink carrier.

[0075] Type A Switching Example

[0076] For example, for Type A SRS carrier switching, the base station may configure the UE with a higher-layer parameter indicating whether the SRS carrier switching is Type A or Type B. An example of a parameter may include an SRS TPC PDCCH group (e.g., srs-TPC-PDCCH-Group=typeA) to indicate Type A SRS carrier switching. The base station may configure the UE for Type A SRS carrier switching for an uplink carrier that does not have PUCCH and PUSCH or an uplink carrier on which SRS power control is not bundled with PUSCH power control. In a Type A configuration, the base station may provide a block configured by higher layers for the UE. A single block may include an SRS request and / or a set of one or more TPC commands. The SRS request may include 0 or 2 bits, for example, the SRS request field may or may not be present in the block sent to the UE. As an example, the block may include TPC command number 1, TPC command number 2, TPC command number 3... and so on, up to TPC command number N. Each TPC command may be applied to a corresponding uplink carrier provided to the UE from the base station via higher-layer parameters. A higher-layer parameter may indicate a CC set using an index (e.g., "cc-IndexInOneCC-Set"), which may indicate a CC index in one CC set for type A SRS carrier switching. The base station may provide a field related to a CC set (e.g., cc-IndexInOneCC-Set) to the UE to indicate the CC index for one CC set when indicating a type A SRS carrier switching configuration to the UE (e.g., when sending SRS carrier switching type A configuration information (e.g., "srs-TPC-PDCCH-Group=type A") to the UE).

[0077] For type A SRS carrier switching, the base station may provide the UE with an index for the serving cell set (e.g., "cc-SetIndex"), which includes the index of the serving cell in the serving cell set provided by the parameter regarding the CC set (e.g., "cc-IndexInOneCC-Set"). The base station may send a DCI field, such as a DCI format 2_3 field, to the UE, which includes a TPC command for each serving cell from the serving cell set and may also include an SRS request for SRS transmission on the serving cell set.

[0078] As an example, for a particular uplink carrier, the base station may send a high-level parameter for uplink configuration (e.g., "UplinkConfig"), which includes a carrier switching parameter (e.g., "carrierswitching") indicating that the UE is configured for SRS carrier switching. The UE may be configured with a carrier to monitor for triggers for sending SRS on the uplink carrier. The carrier monitored by the UE for SRS requests and / or TPC commands may be referred to as a "monitoring cell" or "monitoring carrier." The uplink carrier for which the base station is requesting SRS may be referred to as a "target carrier" or "target cell." If the base station configures the UE for SRS carrier switching, the base station may send the SRS carrier switching parameters to the UE, for example, in an SRS carrier switching information element (IE) (e.g., "SRS-CarrierSwitching IE"). The base station may use the SRS carrier switching IE to configure the UE for SRS carrier switching (e.g., when PUSCH is not configured for the carrier) and / or to provide SRS power control for the carrier that is independent of PUSCH power control.

[0079] For each target carrier (which may be interchangeably referred to as a target cell), the SRS carrier switching IE may include an indication of a serving cell whose uplink transmission may be interrupted during SRS transmission on a PUSCH-free carrier (e.g., a PUSCH-free SCell) to transmit SRS on the target carrier. The serving cell that may be interrupted may be indicated by a serving cell index (e.g., in the "SRS-SwitchFromServCellIndex" parameter). For the target carrier, the base station may also send an indication of the SRS carrier switching type (e.g., Type A or Type B). For Type A SRS carrier switching, the base station may send an SRS TPC PDCCH group configuration (e.g., srs-TPC-PDCCH-Group) including a sequence of SRS TPC PDCCH configurations. In contrast, for Type B SRS carrier switching, the base station may send a single srs-TPC-PDCCH-Group configuration. For each target carrier, the base station may configure the UE to monitor one or more other carriers for SRS requests and / or TPC commands. The indicated carrier may be referred to as a monitoring carrier or monitoring cell. The UE will monitor the indicated monitoring cell for DCI with an SRS request or TPC command for the target carrier from the base station. For type A SRS carrier switching, the sequence of SRS-TPC-PDCCH configuration may include an index for a CC set (e.g., "srs-CC-SetIndexList"). For the index for the CC set, the base station may also indicate an index for the CC set (e.g., "cc-SetIndex") and an indication of the CC index in one CC set for type A (e.g., "cc-IndexInOneCC-Set"). The base station may configure SRS carrier switching parameters for the UE, for example, in RRC signaling.

[0080] Figure 4An example communication flow 400 between a base station 402 and a UE 404 including Type A SRS carrier switching is shown. As shown in 403, the base station may configure the UE for SRS carrier switching for at least one target carrier. Each target carrier may include an uplink carrier. For each target carrier, the base station may send an RRC configuration including an indication of a carrier for which SRS transmission is to be interrupted ("SRS-SwitchFromServCellIndex"), an SRS carrier switching type (e.g., Type A / B), an indication of one or more monitoring cells to monitor for DCI with an SRS request or TPC command for the target carrier, an SRS TPC PDCCH configuration (e.g., "SRS-TPC-PDCCH-Config") including an index for a CC set (e.g., "srs-CC-SetIndexList"), an indication of a CC index in one CC set for Type A (e.g., "ss-IndexInOneCC-Set"), and / or an indication of a CC set index for Type A ("cc-SetIndex").

[0081] As shown at 405 , the UE may use the RRC configuration 403 to determine a correspondence correlation between each SRS TPC configuration and each uplink carrier (eg, each target carrier).

[0082] Base station 402 may send DCI 407 to UE 404, the DCI including a request for SRS transmission on a target carrier and / or a TPC command for SRS transmission on a target carrier. The DCI may be based on DCI format 2_3, for example. As an example, DCI 407 may include a sequence of TPC commands, such as TPC command number 1, TPC command number 2, TPC command number 3, ..., and so on, up to TPC command number N. Each TPC command may be applied to a corresponding uplink carrier (e.g., a target carrier) in a CC set, which may be provided, for example, by a higher-layer parameter such as cc-IndexInOneCC-Set.

[0083] At 409, the UE determines which of the configured SRS TPC PDCCH configurations (e.g., "srs-TPC-PDCCH-Config") are triggered by the DCI and which target carriers the DCI applies to. The DCI may indicate a CC set index, and the UE may have identified at 405 which of the target carrier configurations include the indicated CC set index. The UE may store or otherwise maintain the corresponding index in one CC value. Then, at 409, the UE may determine that the kth TPC command included in the DCI will be applied to carrier "i", whose typeA[i] includes a sub-element with a CC set index corresponding to the indicated CC set index and having cc-IndexInOneCC-Set=k.

[0084] The UE may identify the "i" carrier in any of a number of different ways. In a first example, the typeA[i] carrier may correspond to the i-th configured serving cell. Thus, the determination may be based on the relative order of the configured serving cells. The configured serving cells may be ordered based on increasing cell indexes, and TPC commands may be applied to the ordered, configured serving cells in order. In this first example, the number of SRSTPC PDCCH configurations configured by type A may be equal to the number of configured serving cells.

[0085] In a second example, a typeA[i] carrier may correspond to a carrier having a serving cell index (e.g., "servCellIndex") equal to i. Thus, this second example may use an absolute correspondence with a serving cell index (e.g., the i-th serving cell), whereas the first example uses a relative correspondence.

[0086] In a third example, when ordered by increasing serving cell index, a typeA[i] carrier may correspond to the i-th serving cell, which is configured to monitor the monitoring cell carrying the DCI. Thus, upon receiving DCI 407 on the monitoring cell, the UE may first determine which target carriers are configured to monitor the monitoring cell for SRS carrier switching DCI. The UE may then sequentially apply the TPC commands in the DCI to the ordered subset of target carriers used to monitor the monitoring cells.

[0087] In a first example, if the UE receives a sequence of SRS requests and / or TPC commands for type ASRS carrier switching including typeA[0], typeA[1], typeA[2] in DCI 407, and the UE is configured with serving cell index / carrier index {0, 10, 20}, then the typeA[0] SRS request / TPC command is for carrier index 0, the typeA[1] SRS request / TPC command is for carrier index 10, and the typeA[2] SRS request / TPC command is for carrier index 20. For example, TPC command number 1, TPC command number 2, ..., TPC command number N may be applied, where each TPC command is applied to a corresponding UL carrier provided by a higher layer parameter cc-IndexInOneCC-Set, such that the number of SRS-TPC-PDCCH-Configs configured by typeA within the IE SRS-CarrierSwitching is equal to the number of configured serving cells, and the i-th SRS-TPC-PDCCH-Config corresponds to the i-th configured serving cell.

[0088] In a second example, if the UE is configured with serving cell index / carrier index {0, 10, 20}, the DCI may include a typeA[0] SRS request / TPC command for carrier index 0, a typeA[1] SRS request / TPC command including dummy information for carrier index 1, and a typeA[2] SRS request / TPC command including dummy information for carrier index 2. Similar dummy information may be provided for carrier indexes 3-9. A typeA

[10] SRS request / TPC command corresponds to carrier index 10, with dummy information for carrier indexes 11-19. A typeA

[20] SRS request / TPC command corresponds to carrier index 2.

[0089] In a third example, if the UE identifies the target carrier subset of carriers to be configured to monitor on which DCI is received as {1, 5, 20}, then the typeA[0] SRS request / TPC command is used for carrier index 1, the typeA[1] SRS request / TPC command is used for carrier index 5, and the typeA[2] SRS request / TPC command is used for carrier index 20.

[0090] The UE 404 may use the corresponding SRS request and / or TPC command from the DCI 407 to send an SRS 411 on the corresponding target carrier identified at 409 .

[0091] Type B switching example

[0092] If the UE is configured with a higher layer parameter (e.g., "srs-TPC-PDCCH-Group=typeB") indicating type B SRS carrier switching for an uplink carrier / target carrier without PUCCH and PUSCH or an uplink carrier / target carrier on which SRS power control is not bundled with PUSCH power control, then the higher layer may configure one or more blocks for the UE, where each block is applied to the UL carrier. Each block includes an SRS request and / or a TPC command. If present, the SRS request may include two bits. If present, the TPC command may include two bits. Compared to type A, which includes a single block with a sequence of TPC commands, in type B, the base station sends one or more blocks, where each block includes only a single TPC command. Therefore, each block is applied to a single target carrier. For example, the DCI format 2_3 field may include a TPC command for a serving cell index and may also include an SRS request for SRS transmission on the serving cell.

[0093] Various aspects presented herein enable a UE to determine which block applies to a specific target carrier.For type BDCI, the UE may use start bit information about the block to determine the target carrier to which a specific block applies.

[0094] Figure 5 An example communication flow 500 is shown between a base station 502 and a UE 504 that includes Type B SRS carrier switching. As shown at 503, the base station may configure the UE for SRS carrier switching to at least one target carrier. Each target carrier may include an uplink carrier. Along with the RRC configuration, the base station 502 may provide start bit information that the UE uses to determine the correspondence between a particular block of DCI and a target carrier.

[0095] RRC configuration 503 may include similar information as RRC configuration 403 with the addition of start bit information, but without CC set information.

[0096] Base station 502 transmits DCI 505 to UE 504, including a type BSRS switching request for SRS transmission on a target carrier and / or a TPC command for SRS transmission on a target carrier. The DCI may be based on, for example, DCI format 2-3. The DCI may include one or more blocks, each of which includes an SRS request and / or TPC command for a single target carrier. UE 504 may use the starting bit information of a block of DCI 505 to determine the target carrier to which a specific SRS request or TPC command applies.

[0097] In a first example, at 507 , the UE 504 may use the start bit information for each target cell to determine which block of the DCI corresponds to each target cell.

[0098] If, at 503, each target cell has been configured with starting bit information (e.g., "startingBitOffFormat2-3") in the TPC SRS configuration (e.g., "tpc-SRS") in the PDCCH configuration (e.g., "PDCCH-Config"), the starting bit information can be used to index the block for a specific monitoring cell (e.g., a target cell configured to monitor a monitoring cell on which DCI is received). The starting bit information can be configured independently of whether the cell is a monitoring cell of DCI format 2_3.

[0099] A UE may not expect to receive configurations of two different cells with different carrier switching types (e.g., Type A and Type B) and the same configured monitoring cell (e.g., in its "monitoringCells" configuration). Therefore, when DCI is received on a particular monitoring cell, the UE may apply it to either the configured Type A carrier or the configured Type B carrier, but not to both.

[0100] When the UE receives DCI format 2_3 (e.g., DCI 505) in monitoring cell X, UE 504 may scan cells that configure cell X as a monitoring cell on which DCI may be received. The UE may determine that the monitoring cell is a monitoring cell for Type-A or Type-B SRS carrier switching.

[0101] If the monitoring cell is for type B, the UE 504 can use the starting bit information (e.g., "startingBitOffFormat2-3") configured in each target carrier to map the block to the corresponding target carrier. The starting bit information can be, for example, up to 32 bits, so up to 8 cells with 4 bits per block can be configured.

[0102] Compared to the determination for type A at 409, the determination at 507 is different for type B. For example, both target carrier 1 and target carrier 2 may have carrier 0 as a monitoring cell. In type A, the UE may use the start bit information configured in carrier 0 to find the start bit of a single block containing commands for target carrier 1 and target carrier 2 within the DCI received in carrier 0. In contrast, in this first example for type B, the UE may use the corresponding start bit information configured for target carrier 1 and target carrier 2 to find the start bit of a block corresponding to target carrier 1 or target carrier 2, respectively, within the DCI received in carrier 0.

[0103] In a second example for Type B SRS switching, at 509, the UE 504 may determine the uplink carrier to which the SRS request or TPC command applies based on the starting bit information configured for the monitoring cell. The starting bit information configured at 503 (e.g., "startingBitOffFormat2-3") may be configured in the monitoring cell. At 509, the UE may use the starting bit information configured for the monitoring cell to find the starting bit of the first block within the DCI 505 containing commands for multiple target cells. The DCI may include one or more consecutive blocks of SRS requests / TPC commands. If the UE receives DCI (e.g., DCI format 2_3) in the monitoring cell X, the UE scans for target cells that configure cell X as the monitoring cell. For example, if the target cells for carrier 1, carrier 3, carrier 5, and carrier 7 are each configured to monitor DCI on the cell on which DCI 505 is received, the UE may map each consecutive block starting from the block indicated by the start bit information of the monitored cell to an ordered subset of the target carriers, e.g., the i-th CC ordered by increasing serving cell index (i.e., carrier 1, carrier 3, carrier 5, carrier 7).

[0104] The UE 504 may use the corresponding SRS request and / or TPC command from the DCI 505 to send an SRS 511 on the corresponding target carrier identified at 507 or 509 .

[0105] Figure 6 Flowchart 600 of a method of wireless communication. The method may be performed by a UE or a component of a UE (e.g., UE 104, 350, 404, 504; apparatus 1002; a processing system, which may include memory 360 and may be the entire UE 350 or a component of the UE 350, such as the TX processor 368, the RX processor 356, and / or the controller / processor 359). Optional aspects are shown with dashed lines. The method may enable the UE to determine the correspondence between an SRS request and / or TPC command received in a DCI and a target carrier for a Type A SRS carrier switch. For Type A SRS carrier switch, the DCI (e.g., which may be DCI format 2_3) may indicate that an index for a serving cell set is provided by cc-SetIndex, an index for a serving cell in the serving cell set is provided by cc-IndexInOneCC-Set, and that the DCI format 2_3 field includes a TPC command for each serving cell from the serving cell set and may also include an SRS request for SRS transmission on the serving cell set.

[0106] At 602, the UE receives one or more SRS TPC configurations for one or more uplink carriers, wherein each SRS TPC configuration includes a mapping from one uplink carrier to one or more CC sets. In some aspects, the UE may receive multiple SRS TPC configurations for multiple uplink carriers, wherein each SRS TPC configuration includes a mapping from one uplink carrier to one or more CC sets. Receipt of multiple SRS TPC configurations may be, for example, by Figure 10 The SRS TPC component 1040 of the apparatus 1002 is executed. For example, as combined Figure 4 The configuration may be for type A SRS carrier switching. The configuration may correspond to Figure 4 The UE may receive an SRS TPC configuration in RRC signaling 403 from the base station. The UE may also receive a configuration for SRS carrier switching. For example, the UE may receive a configuration indicating type A SRS carrier switching.

[0107] At 604, the UE may determine the correspondence between each SRS TPC configuration and each uplink carrier. In some aspects, this correspondence may also be referred to as a correspondence relationship or correlation. This determination may include combining Figure 4 Any aspect of the description of 405 in the above. This determination can be made, for example, by Figure 10 The corresponding component 1042 of the device 1002 in is executed.

[0108] At 606, the UE receives a DCI including at least one of a request for SRS transmission on one or more uplink carriers or one or more TPC commands for SRS transmission on one or more uplink carriers. In some aspects, for example, the DCI may be received from a monitoring cell. The one or more TPC commands may be received for Type A SRS carrier switching, for example, as described in conjunction with Figure 4 For example, the DCI may include a specific format, such as DCI format 2_3. In some aspects, the UE may receive the DCI on a carrier different from the carrier on which the UE will send the SRS transmission. The reception of the DCI may be performed, for example, by Figure 10 The DCI component 1044 of the device 1002 is executed.

[0109] At 608, the UE may determine, based at least on the correspondence between the one or more SRS TPC configurations and the one or more uplink carriers, one or more uplink carriers to which at least one of the SRS request or the one or more TPC commands corresponds, for example, from a plurality of carriers. In some aspects, the UE may determine the one or more uplink carriers based on the correspondence between the plurality of SRS TPC configurations and the plurality of uplink carriers. The determination may be based on information in an RRC configuration (e.g., RRC configuration 403) and a DCI (e.g., DCI 407), for example, of an SRS switching parameter. The determination may include combining Figure 4 The uplink carrier may be determined, for example, by Figure 10 The uplink carrier component 1046 of the device 1002 is executed.

[0110] In a first example, determining the correspondence relationship between each SRS TPC configuration and each uplink carrier at 608 may include associating the i-th SRS TPC configuration with the i-th configured serving cell when arranged in increasing order of serving cell index. For example, at 610, the UE may apply the corresponding TPC command to the uplink carrier when transmitting the SRS.

[0111] In a second example, determining the correspondence relationship between each of the one or more SRS TPC configurations and each of the multiple uplink carriers at 608 may include associating the i-th SRS-TPC configuration with a serving cell having a serving cell index “i”, and applying one or more TPC commands to the one or more uplink carriers based on the serving cell index.

[0112] In a third example, the UE may determine a subset of carriers configured to receive SRS transmission commands or TPC commands from a monitoring cell. Determining the correspondence between each SRS TPC configuration and each uplink carrier at 608 may include associating the i-th SRS TPC configuration with the i-th uplink carrier of the carrier subset when arranged in increasing order of serving cell index.

[0113] The UE may determine that each TPC command applies to a corresponding uplink carrier provided by a higher layer parameter indicating a CC index in a CC set for type A, such that the number of SRS TPC PDCCH configurations configured by type A within the SRS carrier switching IE (e.g., "SRS-TPC-PDCCH-Config") is equal to the number of configured serving cells, and the i-th SRS TPC PDCCH configuration corresponds to the i-th configured serving cell. Thus, the UE may receive a higher layer parameter indicating a CC index in a CC set for type A SRS carrier switching. For example, the number of multiple SRS TPC configurations configured for type A SRS carrier switching within the SRS carrier switching IE is equal to the number of configured serving cells, and transmitting the SRS on one or more uplink carriers at 610 may include applying each TPC command received in the DCI to a corresponding uplink carrier provided by the higher layer parameter, such that the i-th SRS TPC configuration corresponds to the i-th configured serving cell for the UE. In some aspects, a UE may receive one SRS carrier switching IE, and the number of multiple SRS TPC configurations configured for Type A SRS carrier switching within the SRS carrier switching IE may be equal to the number of configured serving cells. This concept may also be applied to multiple SRS carrier switching IEs. Thus, in some aspects, a UE may receive multiple SRS carrier switching IEs, and the number of multiple SRS TPC configurations configured for Type A SRS carrier switching within the SRS carrier switching IE may be equal to the number of configured serving cells.

[0114] At 610, in response to receiving the DCI at 606, the UE transmits an SRS on one or more uplink carriers (e.g., from the multiple uplink carriers configured at 602) using the corresponding TPC command. For example, the UE may transmit the SRS on the uplink carriers based on the correspondence relationship between the multiple SRS TPC configurations and the multiple uplink carriers. The transmission of the SRS may include combining Figure 4 The transmission of SRS may be performed by, for example, Figure 10 The SRS component 1048 of the apparatus 1002 in FIG. 10A may perform the SRS. In some aspects, the UE may switch from the carrier on which the DCI was received to the one or more uplink carriers determined at 608 to transmit the SRS.

[0115] For example, transmitting an SRS on one or more uplink carriers may include applying each TPC command received in the DCI to the corresponding uplink carrier provided by the higher layer parameters, such that the i-th SRS TPC configuration corresponds to the i-th configured serving cell for the UE in the CC set for Type A SRS carrier switching. For example, the number of multiple SRS TPC configurations configured for Type A within the SRS carrier switching IE may be equal to the number of configured serving cells. In some aspects, the UE may also receive a higher layer parameter indicating a CC index in the CC set for Type A SRS carrier switching. As described in conjunction with 608, when transmitting the SRS, the UE may apply each TPC command to the corresponding uplink carrier provided by the higher layer parameter indicating a CC index in the CC set for Type A, such that the number of SRS TPC PDCCH configurations configured for Type A within the SRS carrier switching IE (e.g., SRS-TPC-PDCCH-Configuration) is equal to the number of configured serving cells, and the i-th SRS-TPC-PDCCH-Configuration corresponds to the i-th configured serving cell.

[0116] In other aspects, the UE may send SRS based on a correspondence relationship between each SRS TPC configuration and each uplink carrier, including associating the i-th SRS TPC configuration with the i-th configured serving cell when arranged in increasing order of serving cell index, e.g., as described in conjunction with 608.

[0117] In other aspects, the UE may send an SRS based on a correspondence relationship between each SRS TPC configuration in a plurality of SRS TPC configurations and each uplink carrier in a plurality of uplink carriers, including associating the i-th SRS TPC configuration with a serving cell having a serving cell index "i", wherein the UE sends the SRS by applying one or more TPC commands to one or more uplink carriers based on the serving cell index.

[0118] Figure 7700 is a flow chart of a method of wireless communication. The method may be performed by a UE or a component of a UE (e.g., UE 104, 350, 404, 504; apparatus 1002; a processing system, which may include memory 360 and may be the entire UE 350 or a component of the UE 350, such as the TX processor 368, the RX processor 356, and / or the controller / processor 359). Optional aspects are shown with dashed lines. The method may enable the UE to determine the correspondence between an SRS request and / or TPC command received in a DCI and a target carrier for a Type B SRS carrier switch. For Type B SRS carrier switch, the DCI (e.g., which may be DCI format 2_3) may include a TPC command for a serving cell index and may also include an SRS request for SRS transmission on the serving cell.

[0119] At 702, the UE receives one or more SRS TPC configurations for one or more uplink carriers. In some aspects, the UE may receive multiple SRS TPC configurations for multiple uplink carriers. The configurations may be for type BSRS carrier switching, for example, as combined with Figure 5 This configuration may correspond to Figure 5 RRC configuration 503 in. Reception of one or more SRS TPC configurations may be performed, for example, by Figure 10 The SRS TPC component 1040 of the apparatus 1002 is executed.

[0120] At 706, the UE receives DCI from the monitoring cell, the DCI including at least one of a request for SRS transmission on one or more uplink carriers or one or more TPC commands for SRS transmission on one or more uplink carriers. The reception of the DCI may be performed by, for example, Figure 10 The DCI component 1044 of the apparatus 1002 is executed. The DCI may include a combination of Figure 5 505 in the DCI. One or more TPC commands may be received in control signaling for a Type B SRS carrier switch, the control signaling comprising one or more blocks, each block comprising a TPC command for an uplink carrier. The UE may not desire to receive configurations of two different uplink cells having different carrier switch types and the same configured monitoring cell. For example, the DCI may include a specific format, such as DCI format 2_3. In some aspects, the UE may receive the DCI on a different carrier than the carrier on which the UE will send an SRS transmission.

[0121] At 708, the UE may determine, based at least on the start bit information, one or more uplink carriers, e.g., from a plurality of carriers, to which at least one of the SRS request or the one or more TPC commands corresponds. The SRS TPC configuration for each of the one or more uplink carriers may include a start bit indication indicating a start bit of a corresponding block within the one or more blocks, e.g., as described in conjunction with Figure 5 As described in 507. For example, Figure 10 The determination of the uplink carrier is performed by the uplink carrier component 1046 of the device 1002.

[0122] At 704, the UE may receive a monitoring cell configuration including a start bit indication indicating a start bit of a first block of the one or more blocks. The UE may apply a TPC command to one or more uplink carriers based on a mapping between a consecutive order of the one or more blocks and an order of a subset of cells configured to receive SRS information from the monitoring cell, for example, as described in conjunction with Figure 5 The order of the cell subsets may be based on the increasing order of the serving cell index for the cell subsets. The receiving of the start bit indication may be performed by the start bit indication component 1050.

[0123] At 710, the UE transmits an SRS on one or more uplink carriers (e.g., from a plurality of uplink carriers) using the corresponding TPC command and start bit information. The correspondence between the TPC command and the uplink carrier may be determined based on any of the aspects described in conjunction with 708. The transmission of the SRS may include combining Figure 5 The transmission of SRS can be performed by, for example, Figure 10 The SRS component 1048 of the apparatus 1002 in FIG. 10A may perform the SRS. In some aspects, the UE may switch from the carrier on which the DCI was received to the one or more uplink carriers determined at 708 to transmit the SRS.

[0124] An apparatus may include a device for performing Figure 6 、 Figure 7 and / or by Figure 4 and / or additional components of each block of the algorithm in the flowchart of each aspect of the UE execution in 5. Therefore, Figure 6 、 Figure 7 and / or by Figure 4Each block in the flowchart of each aspect performed by the UE in 5 and / or 6 may be performed by a component, and the apparatus may include one or more of these components. The component may be one or more hardware components specifically configured to perform the process / algorithm, implemented by a processor configured to perform the process / algorithm, stored in a computer-readable medium for processor implementation, or some combination thereof.

[0125] Figure 8 Flowchart 800 of a method of wireless communication. The method may be performed by a base station or a component of a base station (e.g., base station 102, 180, 310, 402, 502; apparatus 1102; a processing system, which may include memory 376 and may be the entire base station 310 or a component of base station 310, such as TX processor 316, RX processor 370, and / or controller / processor 375). The method may enable the base station to indicate the correspondence between an SRS request and / or TPC command received in a DCI and a target carrier for Type A SRS carrier switching. For Type A SRS carrier switching, the DCI (e.g., which may be DCI format 2_3) may indicate that the index for the serving cell set is provided by cc-SetIndex, the index of the serving cell in the serving cell set is provided by cc-IndexInOneCC-Set, and the DCI format 2_3 field includes a TPC command for each serving cell from the serving cell set and may also include an SRS request for SRS transmission on the serving cell set.

[0126] At 802, a base station transmits one or more SRS TPC configurations for one or more uplink carriers to a UE, wherein each SRS TPC configuration includes a mapping from one uplink carrier to one or more CC sets. In some aspects, the base station may transmit multiple SRS TPC configurations for multiple uplink carriers, wherein each SRS TPC configuration includes a mapping from one uplink carrier to one or more CC sets. The configuration may be for type A SRS carrier switching, for example, as combined with Figure 4 This configuration may correspond to Figure 4 RRC configuration 403 in. The transmission of the SRS TPC configuration may be performed by, for example Figure 11 The SRS TPC configuration component 1140 of the device 1102 is executed.

[0127] At 804, the base station transmits a DCI to the UE, the DCI including at least one of a request for SRS transmission on one or more uplink carriers or one or more TPC commands for SRS transmission on one or more uplink carriers, wherein the SRS request or at least one of the one or more TPC commands is applied to the uplink carrier based on at least a correspondence relationship between multiple SRS TPC configurations and multiple uplink carriers. In some aspects, the base station may transmit the DCI on a monitoring cell for the UE. For type A SRS carrier switching, the one or more TPC commands may be transmitted, for example, in conjunction with Figure 4 The DCI may be sent, for example, by Figure 11 The DCI component 1142 of the device is executed.

[0128] The correspondence may be based on, for example, information in the RRC configuration (eg, RRC configuration 403) and the DCI (eg, DCI 407) of the SRS switching parameters.

[0129] In a first example, the correspondence between each SRS TPC configuration and each uplink carrier can associate the i-th SRS TPC configuration with the i-th configured serving cell when arranged in increasing order of serving cell index, wherein the transmitting device applies the corresponding TPC command to the uplink carrier when transmitting the SRS.

[0130] In a second example, the correspondence relationship between each of the plurality of SRS TPC configurations and each of the one or more uplink carriers may associate the i-th SRS-TPC configuration with a serving cell having a serving cell index “i” and apply one or more TPC commands to the one or more uplink carriers based on the serving cell index, for example, as combined with Figure 4 and / or Figure 6 As stated.

[0131] In a third example, the carrier subset may be configured to receive a command or TPC command for SRS transmission from a monitoring cell, and the correspondence relationship between each SRS TPC configuration and each uplink carrier may associate the i-th SRS TPC configuration with the i-th uplink carrier of the carrier subset when arranged in increasing order of serving cell index, e.g., as combined with Figure 4 and / or Figure 6 As stated.

[0132] Each TPC command may be applied to a corresponding uplink carrier provided by a higher layer parameter indicating a CC index in a CC set for type A, such that the number of SRS TPC PDCCH configurations configured by type A (e.g., "SRS-TPC-PDCCH-Configuration") within the SRS carrier switching IE of the monitoring cell is equal to the number of configured serving cells, and the i-th SRS TPC PDCCH configuration corresponds to the i-th configured serving cell, e.g., as described in conjunction with Figure 4 and / or Figure 6 As stated.

[0133] At 806, the base station receives an SRS on one or more uplink carriers in response to the corresponding TPC command. The SRS may include a combination of Figure 4 The reception of SRS can be performed by, for example, Figure 11 The SRS component 1144 of the apparatus 1102 in the embodiment of the present invention is performed. The base station can perform measurements on the received SRS, for example, to determine one or more parameters of the uplink channel. The base station can use the measurement results for uplink scheduling, for example, when selecting resources for communicating with the UE.

[0134] Figure 9 Flowchart 900 of a method of wireless communication. The method may be performed by a base station or a component of a base station (e.g., base station 102, 180, 310, 402, 502; apparatus 1102; a processing system, which may include memory 376 and may be the entire base station 310 or a component of base station 310, such as TX processor 316, RX processor 370, and / or controller / processor 375). Optional aspects are shown with dashed lines. The method may enable a base station to indicate a correspondence between an SRS request and / or TPC command received in a DCI and a target carrier for a Type B SRS carrier switch. For a Type B SRS carrier switch, the DCI (e.g., which may be DCI format 2_3) may include a TPC command for a serving cell index and may also include an SRS request for SRS transmission on the serving cell.

[0135] At 902, the base station sends one or more SRS TPC configurations for one or more uplink carriers to the UE. In some aspects, the base station may send multiple SRS TPC configurations for multiple uplink carriers. The configuration may be for type B SRS carrier switching, for example, as combined with Figure 5 This configuration may correspond to Figure 5 The RRC configuration 503 in the SRS TPC configuration can be sent, for example, by Figure 11 The SRS TPC configuration component 1140 of the device 1102 is executed.

[0136] At 906, the base station transmits a DCI on the monitoring cell, the DCI including at least one of a request for SRS transmission on one or more uplink carriers or one or more TPC commands for SRS transmission on one or more uplink carriers, wherein a start bit of each of the one or more TPC commands indicates correspondence with a corresponding uplink carrier from the plurality of carriers. The transmission of the DCI may be performed, for example, by Figure 11 The DCI component 1142 of the device is executed. DCI may include Figure 5 The one or more TPC commands for type B SRS carrier switching may be sent in control signaling comprising one or more blocks, each block comprising a TPC command for an uplink carrier. The base station may not configure two different uplink cells for the UE with different carrier switching types and with the same configured monitoring cell. The SRS TPC configuration for each uplink carrier of the one or more uplink carriers may include a start bit indication indicating a start bit of a corresponding block within the one or more blocks, for example, as described in conjunction with Figure 5 As described in 507.

[0137] At 904, the base station may transmit a monitoring cell configuration including a start bit indication indicating a start bit of a first block of the one or more blocks. The TPC command may be applied to one or more uplink carriers based on a mapping between a sequential order of the one or more blocks and an order of a subset of cells configured to receive SRS information from the monitoring cell, for example, as combined with Figure 5 The order of the cell subsets may be based on the increasing order of the serving cell index for the cell subsets. The transmission may be performed, for example, by Figure 11 The start bit of the device 1102 instructs the component 1146 to execute.

[0138] At 908, the base station receives an SRS on one or more uplink carriers in response to the corresponding TPC command. The transmission of the SRS may include combining Figure 5 The reception of SRS can be performed by, for example, Figure 11 The SRS component 1144 of the apparatus 1102 in the embodiment of the present invention is performed. The base station can perform measurements on the received SRS, for example, to determine one or more parameters of the uplink channel. The base station can use the measurement results for uplink scheduling, for example, when selecting resources for communicating with the UE.

[0139] An apparatus may include a device for performing Figure 8 、 Figure 9 and / or by Figure 4 and / or additional components of each block of the algorithm in the flowchart of each aspect of the base station execution in 5. Thus, Figure 8 、 Figure 9 and / or by Figure 4 Each block in the flowchart of various aspects performed by the base station in 5 and / or 5 may be performed by a component, and the apparatus may include one or more of these components. The component may be one or more hardware components specifically configured to perform the process / algorithm, implemented by a processor configured to perform the process / algorithm, stored in a computer-readable medium for processor implementation, or some combination thereof.

[0140] Figure 10 1 is a schematic diagram 1000 illustrating an example of a hardware implementation for an apparatus 1002. Apparatus 1002 is a UE or a component of a UE and includes a cellular baseband processor 1004 (also referred to as a modem) coupled to a cellular RF transceiver 1022. Apparatus 1002 may also include one or more subscriber identity module (SIM) cards 1020, an application processor 1006 coupled to a secure digital (SD) card 1008 and a screen 1010, a Bluetooth module 1012, a wireless local area network (WLAN) module 1014, a global positioning system (GPS) module 1016, and a power supply 1018. Cellular baseband processor 1004 communicates with UE 104 and / or BS 102 / 180 via cellular RF transceiver 1022. Cellular baseband processor 1004 may include computer-readable media / memory. The computer-readable media / memory may be non-transitory. Cellular baseband processor 1004 is responsible for general processing, including executing software stored on the computer-readable media / memory. When executed by the cellular baseband processor 1004, the software causes the cellular baseband processor 1004 to perform the various functions described herein. The computer-readable medium / memory may also be used to store data that is manipulated by the cellular baseband processor 1004 when executing the software. The cellular baseband processor 1004 also includes a receiving component 1030, a communication manager 1032, and a transmitting component 1034. The communication manager 1032 includes one or more of the components shown. The components within the communication manager 1032 may be stored in a computer-readable medium / memory and / or configured as hardware within the cellular baseband processor 1004. The cellular baseband processor 1004 may be a component of the UE 350 and may include at least one of the TX processor 368, the RX processor 356, and the controller / processor 359 and / or the memory 360. In one configuration, the apparatus 1002 may be a modem chip and include only the baseband processor 1004, while in another configuration, the apparatus 1002 may be the entire UE (e.g., see Figure 3 350) and includes additional modules of the device 1002 discussed herein.

[0141] The communication manager 1032 includes an SRS TPC component 1040 configured to receive one or more SRS TPC configurations for one or more uplink carriers, such as, for example, in conjunction with Figure 6 The communication manager 1032 may further include a correspondence component 1042 configured to determine a correspondence relationship between each SRS TPC configuration and each uplink carrier, for example, as described in conjunction with Figure 6 The communication manager 1032 also includes a DCI component 1044 configured to receive a DCI including at least one of a request for SRS transmission on one or more uplink carriers or one or more TPC commands for SRS transmission on one or more uplink carriers, for example, as described in conjunction with Figure 6 The communication manager 1032 further includes an uplink carrier component 1046 configured to determine one or more uplink carriers corresponding to at least one of the request for SRS transmission or one or more TPC commands, as described in conjunction with Figure 6 or Figure 7 In some aspects, the uplink carrier component 1046 may determine the one or more uplink carriers corresponding to at least one of the request for SRS transmission or the one or more TPC commands based at least on the correspondence between the one or more SRS TPC configurations and the one or more uplink carriers, as described in conjunction with Figure 6 In some aspects, the uplink carrier component 1046 may be configured to determine one or more uplink carriers corresponding to at least one of the SRS request or one or more TPC commands based at least on the start bit information, for example, as described in conjunction with Figure 7 The communication manager 1032 also includes an SRS component 1048 configured to transmit an SRS on one or more uplink carriers in response to receiving the DCI, for example, as described in conjunction with Figure 6 In some aspects, the SRS component 1048 may be configured to transmit an SRS on one or more uplink carriers based on a correspondence between a plurality of SRS TPC configurations and a plurality of uplink carriers, for example, as described in conjunction with Figure 6In some aspects, the SRS component 1048 can be configured to transmit an SRS on one or more uplink carriers using corresponding TPC commands and start bit information, e.g., as described in conjunction with 710. In some aspects, the communications manager 1032 can also include a start bit indication component 1050 configured to receive a monitoring cell configuration, the monitoring cell configuration including a start bit indication indicating a start bit of a first block of the one or more blocks, wherein the one or more TPC commands are determined to be applied to the one or more uplink carriers based on a mapping between a consecutive order of the one or more blocks and an order of a subset of cells configured to receive SRS information from the monitoring cells, e.g., as described in conjunction with Figure 7 In some aspects, the receiving component 1030 can be configured to receive a higher layer parameter indicating a CC index in a CC set for type A SRS carrier switching, for example, as described in conjunction with Figure 6 As stated.

[0142] The apparatus may include a device for performing Figure 6 and / or 7, or by Figure 4 and / or additional components of each of the blocks of the algorithm in the flowchart of each aspect of the UE execution in 5. Therefore, in Figure 6 and / or 7, or by Figure 4 Each block in the flowchart of each aspect of the UE execution in and / or 5 may be performed by a component, and the apparatus may include one or more of those components. The component may be one or more hardware components specifically configured to execute the process / algorithm, implemented by a processor configured to execute the process / algorithm, stored in a computer-readable medium for implementation by a processor, or some combination thereof.

[0143] In some aspects, the apparatus 1002, and in particular the cellular baseband processor 1004, may include means for receiving one or more SRS TPC configurations for a plurality of uplink carriers, wherein the one or more SRS TPC configurations include a mapping from one uplink carrier to one or more CC sets; means for receiving a DCI including at least one of a request for SRS transmission on the one or more uplink carriers or one or more TPC commands for SRS transmission on the one or more uplink carriers; and means for transmitting SRS on the one or more uplink carriers based on a correspondence relationship between the one or more SRS TPC configurations and the one or more uplink carriers. The apparatus 1002 may also include means for receiving a higher layer parameter indicating a CC index in a CC set for Type A SRS carrier switching. The apparatus may also include means for determining a correspondence between each SRS TPC configuration and each uplink carrier. The apparatus may also include determining a subset of carriers configured to receive commands or TPC commands for SRS transmission from a monitoring cell, wherein the correspondence relationship between each SRS TPC configuration and each uplink carrier includes a correlation between the i-th SRS TPC configuration and the i-th uplink carrier of the carrier subset when arranged in increasing order of the serving cell index. The apparatus may also include means for determining, based at least on the correspondence relationship between the plurality of SRS TPC configurations and the plurality of uplink carriers, one or more uplink carriers from the plurality of uplink carriers to which at least one of the request for SRS transmission or the one or more TPC commands corresponds. In some aspects, the apparatus 1002, and in particular the cellular baseband processor 1004, may include means for receiving one or more SRS TPC configurations for the one or more uplink carriers; means for receiving DCI from the monitoring cell, the DCI including at least one of a request for SRS transmission on the one or more uplink carriers or one or more TPC commands for SRS transmission on the one or more uplink carriers; and means for transmitting the SRS on the one or more uplink carriers using the corresponding TPC commands and start bit information. In some aspects, the apparatus 1002 may further include means for determining, based at least on the start bit information, one or more uplink carriers to which at least one of the SRS request or the one or more TPC commands corresponds. In some aspects, the apparatus 1002 may further include means for receiving a monitoring cell configuration including a start bit indication indicating a start bit of a first block of the one or more blocks, wherein the one or more TPC commands are determined to be applied to the one or more uplink carriers based on a mapping between a sequential order of the one or more blocks and an order of a subset of cells configured to receive SRS information from the monitoring cell.The means may be one or more components of the apparatus 1002 configured to perform the functions recited by the means. As described herein, the apparatus 1002 may include the TX processor 368, the RX processor 356, and the controller / processor 359. Thus, in one configuration, the means may be the TX processor 358, the RX processor 356, and the controller / processor configured to perform the functions recited by the means.

[0144] Figure 11 11 is a schematic diagram 1100 illustrating an example hardware implementation for an apparatus 1102. Apparatus 1102 may be a base station and include a baseband unit 1104. Baseband unit 1104 may communicate with UE 104 via a cellular RF transceiver 1122. Baseband unit 1104 may include computer-readable media / memory. Baseband unit 1104 is responsible for general processing, including executing software stored on the computer-readable media / memory. When executed by baseband unit 1104, the software enables baseband unit 1104 to perform the various functions described herein. The computer-readable media / memory may also be used to store data manipulated by baseband unit 1104 when executing the software. Baseband unit 1104 also includes a receiving component 1130, a communication manager 1132, and a transmitting component 1134. Communication manager 1132 includes one or more of the components shown. Components within communication manager 1132 may be stored in computer-readable media / memory and / or configured as hardware within baseband unit 1104. The baseband unit 1104 may be a component of the base station 310 and may include at least one of the TX processor 316 , the RX processor 370 , and the controller / processor 375 , and / or the memory 376 .

[0145] The communication manager 1132 includes an SRS TPC configuration component 1140 configured to send one or more TPC configurations for one or more uplink carriers, e.g., as described in conjunction with Figure 8 In some aspects, each SRS TPC configuration may include a mapping from one uplink carrier to one or more CC sets, wherein a correspondence relationship is provided between each SRS TPC configuration and each uplink carrier, for example, as described in conjunction with 802. The communication manager 1132 also includes a DCI component 1142 configured to send a DCI including at least one of a request for SRS transmission on one or more uplink carriers or one or more TPC commands for SRS transmission on one or more uplink carriers, for example, as described in conjunction with Figure 8 or Figure 9In some aspects, the DCI component 1142 can be configured to send a DCI to the UE, the DCI including at least one of a request for SRS transmission on one or more uplink carriers or one or more TPC commands for SRS transmission on the one or more uplink carriers, wherein the at least one of the SRS request or the one or more TPC commands is applied to the uplink carrier based at least on a correspondence between the one or more SRS TPC configurations and the one or more uplink carriers, for example, as described in conjunction with Figure 8 In some aspects, the start bit of each of the one or more TPC commands may indicate correspondence with a corresponding uplink carrier from the one or more uplink carriers, for example, as described in conjunction with Figure 8 The communication manager 1132 also includes an SRS component 1144 configured to receive SRS on one or more uplinks in response to corresponding TPC commands, as described in conjunction with Figure 8 In some aspects, the apparatus 1102 may further include a start bit indication component 1146 configured to transmit a monitoring cell configuration including a start bit indication indicating a start bit of a first block of the one or more blocks, wherein the one or more TPC commands are applied to the one or more uplink carriers based on a mapping between a consecutive order of the one or more blocks and an order of a subset of cells configured to receive SRS information from the monitoring cell, for example, as described in conjunction with Figure 9 As described in 904.

[0146] The apparatus may include a device for performing Figure 8 and / or 9 and by Figure 4 and / or additional components of each block of the algorithm in the flowchart of each aspect of the base station execution in 5. Thus, Figure 8 and / or 9 and by Figure 4 Each block in the flowchart of various aspects performed by the base station in 5 and / or 5 may be performed by a component, and the apparatus may include one or more of these components. The component may be one or more hardware components specifically configured to perform the process / algorithm, implemented by a processor configured to perform the process / algorithm, stored in a computer-readable medium for processor implementation, or some combination thereof.

[0147] In some aspects, the apparatus 1102, and in particular the baseband unit 1104, may include a unit for sending one or more SRS TPC configurations for one or more uplink carriers to a UE, wherein each SRS TPC configuration includes a mapping from one uplink carrier to one or more CC sets, wherein a correspondence relationship is provided between each SRS TPC configuration and each uplink carrier; a unit for sending a DCI to the UE, the DCI including at least one of a request for SRS transmission on one or more uplink carriers or one or more TPC commands for SRS transmission on one or more uplink carriers, wherein the SRS request or at least one of the one or more TPC commands is applied to the uplink carrier based at least on the correspondence relationship between the one or more SRS TPC configurations and the one or more uplink carriers; and a unit for receiving the SRS on the one or more uplink carriers in response to the corresponding TPC command. In some aspects, apparatus 1102, and in particular baseband unit 1104, may include means for transmitting one or more SRS TPC configurations for one or more uplink carriers to a UE; means for transmitting DCI to the UE on a monitoring cell, the DCI including at least one of a request for SRS transmission on the one or more uplink carriers or one or more TPC commands for SRS transmission on the one or more uplink carriers, wherein a start bit of each of the one or more TPC commands indicates correspondence with a corresponding uplink carrier; and means for receiving SRS on the one or more uplink carriers in response to the corresponding TPC commands. The means may be one or more components of apparatus 1102 configured to perform the functions recited by the means. As described herein, apparatus 1102 may include TX processor 316, RX processor 370, and controller / processor 375. Thus, in one configuration, the means may be TX processor 316, RX processor 377, and controller / processor 375 configured to perform the functions recited by the means.

[0148] The following examples are merely illustrative, and aspects thereof may be combined with other examples, aspects, or aspects of the teachings described herein, but are not limited thereto.

[0149] Aspect 1 is a method for wireless communication at a UE, comprising: receiving multiple SRS TPC configurations for multiple uplink carriers, wherein each SRS TPC configuration includes a mapping from one uplink carrier to one or more CC sets; determining a correspondence relationship between each SRS TPC configuration and each uplink carrier; receiving DCI from a monitoring cell, wherein the DCI includes a request for SRS transmission on one or more uplink carriers or at least one of one or more TPC commands for SRS transmission on one or more uplink carriers; determining one or more uplink channel carriers from the multiple uplink carriers to which the SRS request or at least one of the one or more TPC commands corresponds based at least on the correspondence relationship between the multiple SRS TPC configurations and the multiple uplink carriers; and sending SRS on the one or more uplink carriers using the corresponding TPC command.

[0150] In aspect 2, the method of aspect 1 further includes: the one or more TPC commands are received for type A SRS carrier switching.

[0151] In aspect 3, the method of aspect 1 or aspect 2 also includes: determining the correspondence relationship between each SRS TPC configuration and each uplink carrier includes: when arranged in ascending order of service cell index, associating the i-th SRS TPC configuration with the i-th configured service cell, wherein the UE applies the corresponding TPC command to the uplink carrier when sending the SRS.

[0152] In aspect 4, the method of any aspect 1-3 also includes: the correspondence relationship between each SRS TPC configuration in multiple SRS TPC configurations and each uplink carrier in multiple uplink carriers includes: associating the i-th SRS-TPC configuration with a serving cell with a serving cell index "i", and applying one or more TPC commands to one or more uplink carriers based on the serving cell index.

[0153] In aspect 5, the method of any of aspects 1-4 further includes: determining a carrier subset configured to receive a command or TPC command for SRS transmission from a monitoring cell, and the correspondence relationship between each SRS TPC configuration and each uplink carrier includes: when arranged in ascending order of serving cell index, associating the i-th SRS TPC configuration with the i-th uplink carrier of the carrier subset.

[0154] In aspect 6, the method of any of aspects 1-5 further includes: each TPC command is applied to the corresponding uplink carrier provided by the higher layer parameters, so that the number of SRS-TPC-PDCCH-Configurations configured by type A within the SRS carrier switching information element (IE) of the monitoring cell is equal to the number of configured serving cells, and the i-th SRS-TPC-PDCCH-Configuration corresponds to the i-th configured serving cell.

[0155] Aspect 7 is a device comprising one or more processors and one or more memories in electronic communication with the one or more processors, the one or more memories storing instructions executable by the one or more processors to cause the device to implement the method as in any of aspects 1-6.

[0156] Aspect 8 is a system or apparatus comprising means for implementing the method or apparatus as in any of aspects 1-6.

[0157] Aspect 9 is a non-transitory computer-readable medium storing instructions executable by one or more processors to cause the one or more processors to implement the method as in any of aspects 1-6.

[0158] Aspect 10 includes a method for wireless communication at a user equipment (UE), comprising: receiving multiple SRS TPC configurations for multiple uplink carriers; receiving DCI from a monitoring cell, the DCI including a request for SRS transmission on one or more uplink carriers or at least one of one or more TPC commands for SRS transmission on one or more uplink carriers; determining, based at least on start bit information, one or more uplink carriers from a plurality of uplink carriers to which the SRS request or at least one of the one or more TPC commands corresponds; and sending SRS on the one or more uplink carriers using the corresponding TPC commands.

[0159] In aspect 11, the method of aspect 10 further includes: the one or more TPC commands are received for Type B SRS carrier switching in control signaling comprising one or more blocks, each block comprising a TPC command for an uplink carrier.

[0160] In aspect 12, the method of aspect 10 or aspect 11 further includes: the SRS TPC configuration for each uplink carrier of the plurality of uplink carriers includes a start bit indication indicating a start bit of a corresponding block within the one or more blocks.

[0161] In aspect 13, the method of any of aspects 10-12 further includes: receiving a monitoring cell configuration including a start bit indication, the start bit indication indicating a start bit of a first block of one or more blocks, wherein one or more TPC commands are determined to be applied to one or more uplink carriers based on a mapping between a consecutive order of the one or more blocks and an order of a subset of cells configured to receive SRS information from the monitoring cell.

[0162] In aspect 14, the method of any of aspects 10-13 further comprises: the order of the cell subsets being based on an increasing order of serving cell indices for the cell subsets.

[0163] In aspect 15, the method of any of aspects 10-14 further includes: the UE does not desire to receive configuration of two different uplink cells having different carrier switching types and having the same configured monitoring cell.

[0164] Aspect 16 is a device comprising one or more processors and one or more memories in electronic communication with the one or more processors, the one or more memories storing instructions executable by the one or more processors to cause the device to implement the method as in any of aspects 10-15.

[0165] Aspect 17 is a system or apparatus comprising means for implementing the method or apparatus as in any of aspects 10-15.

[0166] Aspect 18 is a non-transitory computer-readable medium storing instructions executable by one or more processors to cause the one or more processors to implement the method as in any of aspects 10-15.

[0167] Aspect 19 is a method of wireless communication at a base station, comprising: sending multiple SRS TPC configurations for multiple uplink carriers to a UE, wherein each SRS TPC configuration includes a mapping from one uplink carrier to one or more CC sets, wherein a correspondence relationship is provided between each SRS-TPC configuration and each uplink carrier; sending DCI to the UE on a monitoring cell, wherein the DCI includes a request for SRS transmission on one or more uplink carriers or at least one of one or more TPC commands for SRS transmission on one or more uplink carriers, wherein the SRS request or at least one of the one or more TPC commands is applied to the uplink carrier based at least on the correspondence relationship between the multiple SRS TPC configurations and the multiple uplink carriers; and receiving SRS on the one or more uplink carriers in response to the corresponding TPC command.

[0168] In aspect 20, the method of aspect 19 further includes: the one or more TPC commands are for type A SRS carrier switching.

[0169] In aspect 21, the method of aspect 19 or aspect 20 further includes: the correspondence relationship between each SRS TPC configuration and each uplink carrier includes: when arranged in increasing order of serving cell index, associating the i-th SRS TPC configuration with the i-th configured serving cell.

[0170] In aspect 22, the method of any aspect 19-21 also includes: the correspondence relationship between each SRS TPC configuration in multiple SRS TPC configurations and each uplink carrier in multiple uplink carriers includes: associating the i-th SRS-TPC configuration with a serving cell with a serving cell index "i", and applying one or more TPC commands to one or more uplink carriers based on the serving cell index.

[0171] In aspect 23, the method of any of aspects 19-22 further includes: the carrier subset is configured to receive a command or one or more TPC commands for SRS transmission from a monitoring cell, and the correspondence relationship between each SRS TPC configuration and each uplink carrier includes: when arranged in increasing order of serving cell index, associating the i-th SRS TPC configuration with the i-th uplink carrier of the carrier subset.

[0172] In aspect 24, the method of any of aspects 19-23 further includes: each TPC command is applied to the corresponding uplink carrier provided by the higher layer parameters, so that the number of SRS-TPC-PDCCH-Configurations configured by type A within the SRS carrier switching information element (IE) of the monitoring cell is equal to the number of configured serving cells, and the i-th SRS-TPC-PDCCH-Configuration corresponds to the i-th configured serving cell.

[0173] Aspect 25 is a device or apparatus comprising one or more processors and one or more memories in electronic communication with the one or more processors, the one or more memories storing instructions executable by the one or more processors to cause the device to implement the method as in any of aspects 19-24.

[0174] Aspect 26 is a system or apparatus comprising means for implementing the method or apparatus as in any of aspects 19-24.

[0175] Aspect 27 is a non-transitory computer-readable medium storing instructions executable by one or more processors to cause the one or more processors to implement the method as in any of Aspects 19-24.

[0176] Aspect 28 is a method of wireless communication at a base station, comprising: sending multiple SRS TPC configurations for multiple uplink carriers to a UE; on a monitoring cell, sending DCI to the UE, wherein the DCI includes a request for SRS transmission on one or more uplink carriers or at least one of one or more TPC commands for SRS transmission on one or more uplink carriers, wherein a start bit of each of the one or more TPC instructions indicates a correspondence with a corresponding uplink carrier from the multiple uplink carriers; and receiving SRS on the one or more uplink carriers in response to the corresponding TPC command.

[0177] In aspect 29, the method of aspect 28 further includes: the one or more TPC commands are switched for the type B SRS carrier in control signaling, the control signaling comprising one or more blocks, each block comprising a TPC command for an uplink carrier.

[0178] In aspect 30, the method of aspect 28 or aspect 29 further comprises: the SRS TPC configuration for each uplink carrier of the plurality of uplink carriers comprising a start bit indication indicating a first block start bit of a corresponding block within the one or more blocks.

[0179] In aspect 31, the method of any of aspects 28-30 further includes: sending a monitoring cell configuration including a start bit indication, the start bit indication indicating a start bit of a first block of one or more blocks, wherein the one or more TPC commands are applied to the one or more uplink carriers based on a mapping between a consecutive order of the one or more blocks and an order of a subset of cells configured to receive SRS information from the monitoring cell.

[0180] In aspect 32, the method of any of aspects 28-31 further comprises: the order of the cell subsets being based on an increasing order of serving cell indices for the cell subsets.

[0181] In aspect 33, the method of any of aspects 28-32 further includes: the base station does not configure, for the UE, two different uplink cells having different carrier switching types and having the same configured monitoring cell.

[0182] Aspect 34 is a device comprising one or more processors and one or more memories in electronic communication with the one or more processors, the one or more memories storing instructions executable by the one or more processors to cause the device to implement the method as in any of aspects 28-33.

[0183] Aspect 35 is a system or apparatus comprising means for implementing the method or apparatus as in any of aspects 28-33.

[0184] Aspect 36 is a non-transitory computer-readable medium storing instructions executable by one or more processors to cause the one or more processors to implement the method as in any of Aspects 28-33.

[0185] Aspect 37 is a method of wireless communication at a UE, comprising: receiving one or more SRS TPC configurations for multiple uplink carriers, wherein the one or more SRS TPC configurations include a mapping from one uplink carrier to one or more CC sets; receiving DCI, wherein the DCI includes at least one of a request for SRS transmission on the one or more uplink carriers or one or more TPC commands for SRS transmission on the one or more uplink carriers; and sending SRS on the one or more uplink carriers based on the correspondence between the one or more SRS TPC configurations and the one or more uplink carriers.

[0186] In aspect 38, the method of aspect 37 further includes: the one or more TPC commands are received for type A SRS carrier switching.

[0187] In aspect 39, the method of aspect 38 also includes: the number of one or more SRS TPC configurations configured by type ASRS carrier switching within at least one SRS carrier switching IE is equal to the number of configured service cells, and wherein, sending SRS on one or more uplink carriers includes: applying each TPC command received in the DCI to the corresponding uplink carrier provided by the higher layer parameters, so that the i-th SRS TPC configuration corresponds to the i-th configured service cell for the UE.

[0188] In aspect 40, the method of any of aspects 37-39 further includes receiving a higher layer parameter indicating a CC index in a CC set for Type A SRS carrier switching.

[0189] In aspect 41, the method of any of aspects 37-40 further includes: each TPC command is applied to a corresponding uplink carrier provided by a higher layer parameter, so that the number of SRS TPC physical downlink control channel (PDCCH) configurations configured for type A within the SRS carrier switching information element (IE) is equal to the number of configured serving cells, and the i-th SRS TPC PDCCH configuration corresponds to the i-th configured serving cell.

[0190] In aspect 42, the method of any of aspects 37-41 further comprises determining a correspondence between each SRS TPC configuration and each uplink carrier.

[0191] In aspect 43, the method of aspect 42 also includes: sending the SRS includes: applying the corresponding TPC command to the uplink carrier based on the correspondence between each SRS TPC configuration and each uplink carrier, including: associating the i-th SRS TPC configuration with the i-th configured serving cell when arranged in ascending order of serving cell index.

[0192] In aspect 44, the method of aspect 42 also includes: correspondence between each SRS TPC configuration in one or more SRS TPC configurations and each uplink carrier in one or more uplink carriers, including: associating the i-th SRS-TPC configuration with a serving cell with a serving cell index "i", and wherein sending the SRS includes: applying one or more TPC commands to the one or more uplink carriers based on the serving cell index.

[0193] In aspect 45, the method of aspect 42 further includes: the carrier subset is configured to receive a command or a TPC command for SRS transmission from a monitoring cell, and the correspondence between each SRS TPC configuration and each uplink carrier includes: when arranged in increasing order of serving cell index, the correlation between the i-th SRS TPC configuration of the carrier subset and the i-th uplink carrier.

[0194] In aspect 46, the method of any of aspects 37-46 further includes: based at least on the correspondence between the one or more SRS TPC configurations and the one or more uplink carriers, corresponding to at least one of the request for SRS transmission or the one or more TPC commands.

[0195] Aspect 47 is an apparatus for wireless communication at a UE, comprising: a memory; and at least one processor coupled to the memory, wherein the memory and the at least one processor are configured to perform the method of any of aspects 37-46.

[0196] Aspect 48 is an apparatus for wireless communication at a UE, comprising means for performing the method of any of aspects 37-46.

[0197] Aspect 49 is a non-transitory computer-readable storage medium storing computer-executable code for wireless communication at a UE, which, when executed by a processor, causes the processor to perform the method of any of aspects 37-46.

[0198] Aspect 50 is a method of wireless communication at a UE, comprising: receiving one or more SRS TPC configurations for one or more uplink carriers; receiving DCI, wherein the DCI includes at least one of a request for SRS transmission on the one or more uplink carriers or one or more TPC commands for SRS transmission on the one or more uplink carriers; and sending SRS on the one or more uplink carriers using corresponding TPC commands and start bit information.

[0199] In aspect 51, the method of aspect 50 further includes: the UE receiving one or more TPC commands for type BSRS carrier switching in control signaling including one or more blocks, each block including a TPC command for an uplink carrier.

[0200] In aspect 52, the method of aspect 50 or aspect 51 further includes: the SRS TPC configuration for each uplink carrier of the one or more uplink carriers includes start bit information, the start bit information indicating a start bit of a corresponding block for the corresponding uplink carrier within the one or more blocks.

[0201] In aspect 53, the method of any of aspects 50-52 further includes determining, based at least on the start bit information, one or more uplink carriers from the one or more uplink carriers to which at least one of the SRS request or the one or more TPC commands corresponds.

[0202] In aspect 54, the method of any of aspects 50-53 further includes: receiving a monitoring cell configuration including a start bit indication, the start bit indication indicating a start bit of a first block of one or more blocks, wherein one or more TPC commands are determined to be applied to one or more uplink carriers based on a mapping between a consecutive order of the one or more blocks and an order of a subset of cells configured to receive SRS information from the monitoring cell.

[0203] In aspect 55, the method of aspect 54 further comprises: the order of the cell subsets being based on an increasing order of serving cell indices for the cell subsets.

[0204] In aspect 56, the method of any of aspects 50-55 further includes: the UE does not desire to receive configuration of two different uplink cells having different carrier switching types and having the same configured monitoring cell.

[0205] Aspect 57, in an apparatus for wireless communication at a UE, comprising: a memory; and at least one processor coupled to the memory, wherein the memory and the at least one memory are configured to perform the method of any of aspects 50-56.

[0206] Aspect 58 is an apparatus for wireless communication at a UE, comprising means for performing the method of any of aspects 50-56.

[0207] Aspect 59 is a non-transitory computer-readable storage medium storing computer-executable code for wireless communication at a UE, which, when executed by a processor, causes the processor to perform the method of any of aspects 50-56.

[0208] The specific order or hierarchy of blocks in the disclosed process / flow diagrams is illustrative of example methods. Based on design preferences, the specific order or hierarchy of blocks in the process / flow diagrams may be rearranged. Additionally, some blocks may be combined or omitted. The accompanying method claims present elements of the various blocks in an example order and are not meant to be limited to the specific order or hierarchy presented.

[0209] The foregoing description is provided to enable any person skilled in the art to implement the various aspects described herein. Various modifications to these aspects will be apparent to those skilled in the art, and the general principles defined herein can be applied to other aspects. Therefore, the claims are not intended to be limited to the various aspects shown herein, but rather to be given the full scope consistent with the text of the claims, wherein, unless explicitly stated otherwise, references to singular elements are not intended to mean "one and only one," but rather "one or more." The word "exemplary" is used herein to mean "serving as an example, instance, or illustration." Any aspect described herein as "exemplary" is not necessarily to be construed as being preferred over or having advantages over other aspects. Unless otherwise explicitly stated, the term "some" refers to one or more. Combinations such as "at least one of A, B, or C," "one or more of A, B, or C," "at least one of A, B, and C," and "A, B, C, or any combination thereof" include any combination of A, B, or C, and may include multiples of A, multiples of B, or multiples of C. Specifically, combinations such as "at least one of A, B, or C," "one or more of A, B, or C," "at least one of A, B and C," "one or more of A, B and C," and "A, B, C, or any combination thereof" may be A only, B only, C only, A and B, A and C, B and C, or A and B and C, where any such combination may include one or more members of A, B, or C. All structural and functional equivalents of the elements of the various aspects described throughout this disclosure that are known or later become known to those of ordinary skill in the art are expressly incorporated herein by reference and are intended to be encompassed by the claims. In addition, nothing disclosed herein is intended to be dedicated to the public regardless of whether such disclosure is explicitly recited in the claims. The words "module," "mechanism," "element," "device," and the like are not substitutes for the word "unit." Thus, no claim element is to be construed as a functional unit unless the element is explicitly recited using the phrase "unit for..."

Claims

1. A method of wireless communication at a user equipment (UE), comprising: receiving one or more sounding reference signal (SRS) transmit power control (TPC) configurations for type A SRS carrier switching on one or more uplink carriers, wherein the one or more SRS TPC configurations include a mapping from one uplink carrier to one or more component carrier (CC) sets; receiving downlink control information (DCI), the DCI comprising at least one of: a request for SRS transmission on one or more uplink carriers; or one or more TPC commands for SRS transmission on the one or more uplink carriers; and transmitting an SRS on the one or more uplink carriers based on the correspondence between the one or more SRS TPC configurations and the one or more uplink carriers; wherein the number of the one or more SRS TPC configurations configured for the Type A SRS carrier switching within at least one SRS carrier switching information element (IE) is equal to the number of configured serving cells, and wherein transmitting the SRS on the one or more uplink carriers comprises: Each TPC command received in the DCI is applied to a corresponding uplink carrier provided by higher layer parameters, such that an i-th SRS TPC configuration corresponds to an i-th configured serving cell for the UE.

2. The method according to claim 1, further comprising: The higher layer parameter indicating a CC index in a CC set for the Type A SRS carrier switching is received.

3. The method according to claim 1, wherein Each TPC command is applied to the corresponding uplink carrier provided by the higher layer parameter indicating the CC index in the component carrier (CC) set for type A, such that the number of SRS TPC physical downlink control channel (PDCCH) configurations for type A configuration within the SRS carrier switching information element (IE) is equal to the number of configured serving cells, and the i-th SRS-TPC-PDCCH-Configuration corresponds to the i-th configured serving cell.

4. The method according to claim 1, further comprising: The correspondence between each SRS TPC configuration and each uplink carrier is determined.

5. The method according to claim 1, wherein Sending the SRS includes applying a corresponding TPC command to an uplink carrier based on the correspondence between each SRS TPC configuration and each uplink carrier, including associating an i-th SRS TPC configuration with an i-th configured serving cell when arranged in increasing order of serving cell index.

6. The method according to claim 1, wherein Sending the SRS includes: applying the one or more TPC commands to the one or more uplink carriers based on the serving cell index and based on the correspondence between each SRS TPC configuration in the one or more SRS TPC configurations and each uplink carrier in the one or more uplink carriers, including: associating the i-th SRS TPC configuration with the serving cell with serving cell index "i".

7. The method according to claim 4, wherein: The carrier subset is configured to receive a command or TPC command for the SRS transmission from a monitoring cell, and the correspondence between each SRS TPC configuration and each uplink carrier includes: when arranged in increasing order of serving cell index, the correlation of the i-th SRS TPC configuration with the i-th uplink carrier of the carrier subset.

8. The method according to claim 1, wherein The one or more uplink carriers to which at least one of the request for the SRS transmission or the one or more TPC commands corresponds is based on the correspondence between the one or more SRS TPC configurations and the one or more uplink carriers.

9. An apparatus for wireless communication at a user equipment (UE), comprising: Memory; as well as at least one processor coupled to the memory and configured to: receiving one or more sounding reference signal (SRS) transmit power control (TPC) configurations for type A SRS carrier switching on one or more uplink carriers, wherein the one or more SRS TPC configurations include a mapping from one uplink carrier to one or more component carrier (CC) sets; receiving downlink control information (DCI) from a monitoring cell, the DCI comprising at least one of a request for SRS transmission on one or more uplink carriers or one or more TPC commands for the SRS transmission on the one or more uplink carriers; and In response to receiving the DCI, transmitting an SRS on the one or more uplink carriers based on the correspondence between the one or more TPC configurations and the one or more uplink carriers; wherein the number of the one or more SRS TPC configurations configured for the Type A SRS carrier switching within at least one SRS carrier switching information element (IE) is equal to the number of configured serving cells, and wherein, to transmit the SRS on the one or more uplink carriers, the at least one processor is further configured to: Each TPC command received in the DCI is applied to a corresponding uplink carrier provided by higher layer parameters, such that an i-th SRS TPC configuration corresponds to an i-th configured serving cell for the UE.

10. The device according to claim 9, wherein The at least one processor is further configured to: The higher layer parameter indicating a CC index in a CC set for the Type A SRS carrier switching is received.

11. The device according to claim 9, wherein Each TPC command is applied to the corresponding uplink carrier provided by the higher layer parameter indicating the CC index in the component carrier (CC) set for type A, such that the number of SRS TPC physical downlink control channel (PDCCH) configurations for type A configuration within the SRS carrier switching information element (IE) is equal to the number of configured serving cells, and the i-th SRS-TPC-PDCCH-Configuration corresponds to the i-th configured serving cell.

12. The device according to claim 9, wherein The at least one processor is further configured to: The correspondence between each SRS TPC configuration and each uplink carrier is determined.

13. The device according to claim 9, wherein In order to send the SRS, the at least one processor is further configured to: apply the corresponding TPC command to the uplink carrier based on the correspondence between each SRS TPC configuration and each uplink carrier, including: when arranged in ascending order of service cell index, associating the i-th SRS TPC configuration with the i-th configured service cell.

14. The device according to claim 9, wherein In order to send the SRS, the at least one processor is further configured to: apply the one or more TPC commands to the one or more uplink carriers based on a serving cell index and based on the correspondence between each of the one or more SRS TPC configurations and each of the one or more uplink carriers, including associating the i-th SRS TPC configuration with a serving cell having a serving cell index "i".

15. The device according to claim 12, wherein The carrier subset is configured to receive a command or TPC command for the SRS transmission from the monitoring cell, and the correspondence between each SRS TPC configuration and each uplink carrier includes: when arranged in increasing order of serving cell index, the correlation of the i-th SRS TPC configuration with the i-th uplink carrier of the carrier subset.

16. The device according to claim 9, wherein The one or more uplink carriers to which at least one of the request for the SRS transmission or the one or more TPC commands corresponds is based on the correspondence between the one or more SRS TPC configurations and the one or more uplink carriers.

17. A method of wireless communication at a user equipment (UE), comprising: receiving one or more sounding reference signal (SRS) transmit power control (TPC) configurations for one or more uplink carriers; receiving a monitoring cell configuration including a start bit indication indicating a start bit of a first block of one or more blocks; receiving downlink control information (DCI) from a monitoring cell, the DCI comprising at least one of a request for SRS transmission on the one or more uplink carriers or one or more TPC commands for the SRS transmission on the one or more uplink carriers, wherein the one or more TPC commands are determined to apply to the one or more uplink carriers based on a mapping between a consecutive order of the one or more blocks and an order of a subset of cells configured to receive SRS information from the monitoring cell; and An SRS is transmitted from the one or more uplink carriers on the one or more uplink carriers based on the corresponding TPC command and the corresponding start bit information.

18. The method according to claim 17, wherein The UE receives the one or more TPC commands for Type B SRS carrier switching in control signaling comprising the one or more blocks, each block comprising a TPC command for an uplink carrier.

19. The method according to claim 18, wherein One or more SRS TPC configurations for each of the one or more uplink carriers include the corresponding start bit information indicating the start bit of a corresponding block for the corresponding uplink carrier within the one or more blocks.

20. The method of claim 18, further comprising: The one or more uplink carriers from the one or more uplink carriers corresponding to the request for the SRS transmission or the at least one of the one or more TPC commands are determined based at least on the corresponding start bit information.

21. The method according to claim 17, wherein The order of the cell subsets is based on an increasing order of serving cell indices for the cell subsets.

22. The method according to claim 17, wherein The UE does not expect to receive configuration of two different uplink cells having different carrier switching types and having the same configured monitoring cell.

23. An apparatus for wireless communication at a user equipment (UE), comprising: Memory; as well as at least one processor coupled to the memory and configured to: receiving one or more sounding reference signal (SRS) transmit power control (TPC) configurations for one or more uplink carriers; receiving a monitoring cell configuration including a start bit indication indicating a start bit of a first block of one or more blocks; receiving downlink control information (DCI) from a monitoring cell, the DCI comprising at least one of a request for SRS transmission on one or more uplink carriers or one or more TPC commands for the SRS transmission on the one or more uplink carriers, wherein the one or more TPC commands are applied to the one or more uplink carriers based on a mapping between a consecutive order of the one or more blocks and an order of a subset of cells configured to receive SRS information from the monitoring cell; as well as An SRS is transmitted from the one or more uplink carriers on the one or more uplink carriers based on the corresponding TPC command and the corresponding start bit information.

24. The device according to claim 23, wherein The at least one processor is configured to receive the one or more TPC commands for Type B SRS carrier switching in control signaling comprising the one or more blocks, each block comprising a TPC command for an uplink carrier.

25. The apparatus according to claim 24, wherein One or more SRS TPC configurations for each of the one or more uplink carriers include the corresponding start bit information indicating the start bit of a corresponding block for the corresponding uplink carrier within the one or more blocks.

26. The apparatus according to claim 24, wherein The at least one processor is further configured to: The one or more uplink carriers from the one or more uplink carriers corresponding to the request for the SRS transmission or the at least one of the one or more TPC commands are determined based at least on the corresponding start bit information.

27. The apparatus according to claim 23, wherein The order of the cell subsets is based on an increasing order of serving cell indices for the cell subsets.

28. The apparatus according to claim 23, wherein The apparatus is configured not to receive configuration of two different uplink cells having different carrier switching types and having the same configured monitoring cell.

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