Method and apparatus for enhanced sounding

Abstract

Methods, systems, and devices for wireless communications are described. A user equipment (UE) may receive a configuration identifying a first set of frequency resources for transmitting a sounding reference signal, wherein the sounding reference signal may be used for at least downlink channel state information acquisition. The UE may receive an indication of an association between the configuration for the sounding reference signal and a second set of frequency resources, and determine values ​​of one or more sounding reference signal transmission parameters for the first set of frequency resources based on the association. The UE may transmit the sounding reference signal on the first set of frequency resources based on the determined one or more values.

Description

[0001] background

[0002] The following relates generally to wireless communications and, more particularly, to reference signal resource association options for enhanced sounding.

[0003] Wireless communication systems are widely deployed to provide various types of communication content, such as voice, video, packet data, messaging, broadcasting, etc. These systems may be able to support communication with multiple users by sharing available system resources (e.g., time, frequency, and power). Examples of such multiple access systems include fourth generation (4G) systems (such as long term evolution (LTE) systems, advanced LTE (LTE-A) systems, or LTE-A Pro systems), and fifth generation (5G) systems that may be referred to as new radio (NR) systems. These systems may use various technologies, such as code division multiple access (CDMA), time division multiple access (TDMA), frequency division multiple access (FDMA), orthogonal frequency division multiple access (OFDMA), or discrete Fourier transform spread orthogonal frequency division multiplexing (DFT-S-OFDM). A wireless multiple access communication system may include several base stations or network access nodes, each of which simultaneously supports the communication of multiple communication devices, which may be referred to as user equipment (UE).

[0004] The UE may be configured to transmit a reference signal on a channel to the base station, and the base station may obtain channel state information for the channel based on the reference signal.Some techniques for obtaining channel state information may be improved.

[0005] Overview

[0006] The described techniques relate to improved methods, systems, devices and apparatus (equipment) that support reference signal resource association options for enhanced sounding. In general, the described techniques are used to indicate to a user equipment (UE) how to use a sounding reference signal (SRS). In some wireless communication systems, the UE can transmit an SRS to a base station on an uplink channel, and the base station can determine the channel condition of the uplink channel based on the SRS. It may not be supported for the UE to transmit SRS on all carriers, frequency bands, bandwidth portions, or other frequencies of the wireless communication system. However, due to partial channel reciprocity, channel estimates on closely spaced component carriers may be correlated. Therefore, SRS transmissions on one component carrier can be used for downlink beamforming on other component carriers (such as adjacent component carriers or component carriers that are nearby in frequency).

[0007] The various techniques described herein support enhanced reference signal sounding based on the association of SRS frequency resources with associated bandwidths. These techniques can be implemented based on the base station indicating the association to the UE. When the UE is configured for an SRS used to derive downlink channel state information (CSI) of the associated bandwidth, the base station can send an indication of how the SRS is used. In general, the indication can indicate to the UE that the SRS is being used to derive CSI on another specific frequency that replaces or is in addition to the frequency resources on which the SRS is transmitted. The indication can be explicit or implicit, indicating that the CSI is derived based on the bandwidth of the SRS within the active bandwidth part (BWP), different BWPs, different component carriers of the same RF spectrum band, or different component carriers of different RF spectrum bands. This can enable the UE to adjust the SRS transmission to align with the channel conditions on other bandwidths. For example, the UE can apply one or more uplink precodings, make path loss adjustments, or adjust the spatial transmit beam.

[0008] A method of wireless communication at a UE is described. The method may include receiving a configuration that identifies a first set of frequency resources for transmitting a sounding reference signal to be used for at least downlink channel state information acquisition; receiving an indication of an association between the configuration for the sounding reference signal and a second set of frequency resources; determining values ​​of one or more sounding reference signal transmission parameters for the first set of frequency resources based on the association; and transmitting the sounding reference signal on the first set of frequency resources based on the determined one or more values.

[0009] An apparatus for wireless communication at a UE is described. The apparatus may include a processor, a memory coupled to the processor, and instructions stored in the memory. The instructions may be executable by the processor to cause the apparatus to: receive a configuration identifying a first set of frequency resources for transmitting a sounding reference signal to be used at least for downlink channel state information acquisition; receive an indication of an association between the configuration for the sounding reference signal and a second set of frequency resources; determine values ​​of one or more sounding reference signal transmission parameters of the first set of frequency resources based on the association; and transmit a sounding reference signal on the first set of frequency resources based on the determined one or more values.

[0010] Another apparatus for wireless communication at a UE is described. The apparatus may include means for: receiving a configuration identifying a first set of frequency resources for transmitting a sounding reference signal to be used at least for downlink channel state information acquisition; receiving an indication of an association between the configuration for the sounding reference signal and a second set of frequency resources; determining values ​​of one or more sounding reference signal transmission parameters for the first set of frequency resources based on the association; and transmitting a sounding reference signal on the first set of frequency resources based on the determined one or more values.

[0011] A non-transitory computer-readable medium storing code for wireless communication at a UE is described. The code may include instructions executable by a processor for the following operations: receiving a configuration identifying a first set of frequency resources for transmitting a sounding reference signal to be used for at least downlink channel state information acquisition; receiving an indication of an association between the configuration for the sounding reference signal and a second set of frequency resources; determining values ​​of one or more sounding reference signal transmission parameters of the first set of frequency resources based on the association; and transmitting a sounding reference signal on the first set of frequency resources based on the determined one or more values.

[0012] In some examples of the methods, equipment (devices), and non-transitory computer-readable media described herein, determination of transmission parameters may be based at least in part on measurement of channel quality or interference or both of a received physical channel or a received physical signal or both within a second set of frequency resources.

[0013] In some examples of the methods, apparatuses, and non-transitory computer-readable media described herein, the second set of frequency resources includes frequency resources that may not be included in the first set of frequency resources.

[0014] In some examples of the methods, apparatuses, and non-transitory computer-readable media described herein, the second set of frequency resources may be a superset of the first set of frequency resources.

[0015] In some examples of the methods, equipment (devices), and non-transitory computer-readable media described herein, determining the values ​​of one or more sounding reference signal transmission parameters may further include operations, features, devices, or instructions for: determining one or more uplink precoders for transmitting a sounding reference signal based on an association between a first frequency resource set and a second frequency resource set; and applying the one or more uplink precoders when transmitting a sounding reference signal on the first frequency resource set.

[0016] In some examples of the methods, equipment (devices), and non-transitory computer-readable media described herein, one or more sounding reference signal transmission parameters include one or more uplink precoders, uplink transmit power, one or more spatial transmit directions, or any combination thereof.

[0017] Some examples of the methods, equipment (devices), and non-transitory computer-readable media described herein may further include operations, features, devices, or instructions for the following actions: receiving a configuration identifying resources to be used to receive a channel state information reference signal, wherein an indication of the association may be based on the configuration for the channel state information reference signal.

[0018] Some examples of the methods, equipment (devices), and non-transitory computer-readable media described herein may further include operations, features, devices, or instructions for the following actions: receiving a channel state information reference signal, wherein the values ​​of one or more sounding reference signal transmission parameters can be determined based on the received channel state information reference signal.

[0019] Some examples of the methods, equipment (devices), and non-transitory computer-readable media described herein may further include operations, features, devices, or instructions for the following actions: receiving a configuration for one or more channel state information reference signals associated with a second set of frequency resources in conjunction with a configuration identifying a first set of frequency resources, wherein an association between the first set of frequency resources and the second set of frequency resources may be determined based on the jointly received configuration.

[0020] Some examples of the methods, equipment (devices), and non-transitory computer-readable media described herein may further include operations, features, devices, or instructions for the following actions: receiving a media access control control element that activates a semi-persistent opportunity for a first set of frequency resources and a second set of frequency resources.

[0021] In some examples of the methods, equipment (devices), and non-transitory computer-readable media described herein, the first set of frequency resources and the second set of frequency resources include different bandwidths, bandwidth parts, component carriers, radio frequency spectrum bands, or any combination thereof.

[0022] Some examples of the methods, equipment (devices), and non-transitory computer-readable media described herein may further include operations, features, devices, or instructions for the following actions: identifying that the first set of frequency resources and the second set of frequency resources can be in the same bandwidth portion, different bandwidth portions, different component carriers of the same radio frequency spectrum band, or different component carriers of different radio frequency spectrum bands.

[0023] Some examples of the methods, equipment (devices), and non-transitory computer-readable media described herein may further include operations, features, means, or instructions for the following actions: transmitting an indication of UE capabilities associated with a frequency domain gap between a first set of frequency resources and a second set of frequency resources.

[0024] In some examples of the methods, equipment (devices), and non-transitory computer-readable media described herein, the first set of frequency resources corresponds to a first subset of resources within a first downlink component carrier and a second subset of resources within a second downlink component carrier, and wherein a set of transmission opportunities for transmitting a sounding reference signal on the first downlink component carrier and the second downlink component carrier may be based on a sounding reference signal carrier switching indication triggered by a third uplink component carrier.

[0025] In some examples of the methods, equipment (devices), and non-transitory computer-readable media described herein, the second set of frequency resources includes a bandwidth that may be higher in frequency than a subset of resources of the first downlink component carrier, and the bandwidth may be lower in frequency than a subset of resources of the second downlink component carrier.

[0026] Some examples of the methods, equipment (devices), and non-transitory computer-readable media described herein may further include operations, features, devices, or instructions for the following actions: identifying, based on the configuration of the second frequency resource set and the sounding reference signal used for downlink channel state information acquisition, that the sounding reference signal may have a higher priority than other sounding reference signals.

[0027] Some examples of the methods, equipment (devices), and non-transitory computer-readable media described herein may further include operations, features, devices, or instructions for the following actions: determining that the second set of frequency resources includes frequency resources within one or more different bandwidth parts or within one or more component carriers, or frequency resources that may not be part of the first set of frequency resources, wherein based on the second set of frequency resources including frequency resources within the one or more different bandwidth parts or within the one or more component carriers, or frequency resources that may not be part of the first set of frequency resources, the sounding reference signal may be identified as having a higher priority than other sounding reference signals.

[0028] In some examples of the methods, apparatuses, and non-transitory computer-readable media described herein, the higher priority may be associated with a higher priority regarding transmission power reduction due to carrier aggregation power scaling priority.

[0029] In some examples of the methods, apparatuses, and non-transitory computer-readable media described herein, an indication of an association between a first set of frequency resources and a second set of frequency resources may be received along with a configuration identifying a first set of frequency resources for transmitting a sounding reference signal.

[0030] A method of wireless communication at a base station is described. The method may include transmitting a configuration to a UE, the configuration identifying a first set of frequency resources for the UE to use to transmit a sounding reference signal to be used for at least downlink channel state information acquisition; transmitting an indication of an association between the first set of frequency resources and a second set of frequency resources; based on the association, receiving a sounding reference signal from the UE on the first set of frequency resources; and determining channel state information of at least the second set of frequency resources based on the received sounding reference signal.

[0031] An apparatus for wireless communication at a base station is described. The apparatus may include a processor, a memory coupled to the processor, and instructions stored in the memory. The instructions may be executable by the processor to cause the apparatus to: transmit a configuration to a UE, the configuration identifying a first set of frequency resources for the UE to transmit a sounding reference signal to be used at least for downlink channel state information acquisition; transmit an indication of an association between the first set of frequency resources and a second set of frequency resources; based on the association, receive a sounding reference signal from the UE on the first set of frequency resources; and determine channel state information of at least the second set of frequency resources based on the received sounding reference signal.

[0032] Another apparatus for wireless communication at a base station is described. The apparatus may include means for: transmitting a configuration to a UE, the configuration identifying a first set of frequency resources for the UE to use to transmit a sounding reference signal to be used for at least downlink channel state information acquisition; transmitting an indication of an association between the first set of frequency resources and a second set of frequency resources; based on the association, receiving a sounding reference signal from the UE on the first set of frequency resources; and determining channel state information of at least the second set of frequency resources based on the received sounding reference signal.

[0033] A non-transitory computer-readable medium storing code for wireless communication at a base station is described. The code may include instructions executable by a processor for the following operations: transmitting a configuration to a UE, the configuration identifying a first set of frequency resources for the UE to transmit a sounding reference signal to be used for at least downlink channel state information acquisition; transmitting an indication of an association between the first set of frequency resources and a second set of frequency resources; based on the association, receiving a sounding reference signal from the UE on the first set of frequency resources; and determining channel state information of at least the second set of frequency resources based on the received sounding reference signal.

[0034] Some examples of the methods, equipment (devices), and non-transitory computer-readable media described herein may further include operations, features, devices, or instructions for the following actions: transmitting an indication of a configuration of resources for a channel state information reference signal, wherein the indication of the association may be based on the configuration for the channel state information reference signal.

[0035] Some examples of the methods, equipment (devices), and non-transitory computer-readable media described herein may further include operations, features, devices, or instructions for the following actions: jointly transmitting a configuration for one or more channel state information reference signals associated with a second set of frequency resources with a configuration identifying a first set of frequency resources, wherein the association between the first set of frequency resources and the second set of frequency resources may be implicitly indicated based on the jointly transmitted configuration.

[0036] Some examples of the methods, equipment (devices), and non-transitory computer-readable media described herein may further include operations, features, devices, or instructions for the following actions: transmitting a media access control control element for activating a semi-persistent opportunity for a first set of frequency resources and a second set of frequency resources.

[0037] In some examples of the methods, equipment (devices), and non-transitory computer-readable media described herein, the first set of frequency resources and the second set of frequency resources include different bandwidths, bandwidth parts, component carriers, radio frequency spectrum bands, or any combination thereof.

[0038] In some examples of the methods, equipment (devices) and non-transitory computer-readable media described herein, the association indicates that the first set of frequency resources and the second set of frequency resources can be in the same bandwidth part, different bandwidth parts, different component carriers of the same radio frequency spectrum band, or different component carriers of different radio frequency spectrum bands.

[0039] Some examples of the methods, equipment (devices), and non-transitory computer-readable media described herein may further include operations, features, devices, or instructions for the following actions: receiving an indication of UE capabilities associated with a gap between a first set of frequency resources and a second set of frequency resources, wherein a configuration identifying the first set of frequency resources may be based on the UE capabilities.

[0040] In some examples of the methods, equipment (devices), and non-transitory computer-readable media described herein, the first set of frequency resources includes a first uplink component carrier and a second downlink component carrier, and wherein a sounding reference signal can be received on the first uplink component carrier and the second downlink component carrier based on sounding reference signal carrier switching.

[0041] In some examples of the methods, apparatuses, and non-transitory computer-readable media described herein, an indication of an association between a first set of frequency resources and a second set of frequency resources may be received along with a configuration identifying a first set of frequency resources for transmitting a sounding reference signal. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] Figure 1

[0013] An example of a wireless communication system supporting a reference signal resource association option for enhanced sounding in accordance with aspects of the present disclosure is illustrated.

[0044] Figure 2

[0013] An example of a wireless communication system supporting a reference signal resource association option for enhanced sounding in accordance with aspects of the present disclosure is illustrated.

[0045] Figure 3 An example of a bandwidth association configuration supporting a reference signal resource association option for enhanced sounding in accordance with aspects of the present disclosure is illustrated.

[0046] Figure 4 An example of a process flow supporting reference signal resource association options for enhanced sounding in accordance with aspects of the present disclosure is illustrated.

[0047] Figure 5 and 6 A block diagram of a device supporting reference signal resource association options for enhanced sounding is shown in accordance with aspects of the present disclosure.

[0048] Figure 7 A block diagram of a communications manager supporting a reference signal resource association option for enhanced sounding is shown in accordance with aspects of the present disclosure.

[0049] Figure 8 A diagram of a system including a device supporting a reference signal resource association option for enhanced sounding is shown in accordance with aspects of the present disclosure.

[0050] Fig. 9 and 10 A block diagram of a device supporting reference signal resource association options for enhanced sounding is shown in accordance with aspects of the present disclosure.

[0051] Fig.11 A block diagram of a communications manager supporting a reference signal resource association option for enhanced sounding is shown in accordance with aspects of the present disclosure.

[0052] Fig.12 A diagram of a system including a device supporting a reference signal resource association option for enhanced sounding is shown in accordance with aspects of the present disclosure.

[0053] Figures 13 to 16A flow chart illustrating a method of supporting reference signal resource association options for enhanced sounding in accordance with aspects of the present disclosure is shown.

[0054] Detailed Description

[0055] In some wireless communication systems, a user equipment (UE) may transmit a sounding reference signal (SRS) to a base station on an uplink channel, and the base station may determine the channel condition of the uplink channel based on the SRS. However, it may not be supported for the UE to transmit SRS on all carriers or frequencies of the wireless communication system. For example, some carriers used by the UE may be configured for downlink communication instead of uplink communication. Due to the partial reciprocity between the channels, channel estimates on closely spaced component carriers may be related. Therefore, SRS transmission in one frequency resource set (e.g., on one component carrier) may be used for downlink beamforming in another adjacent or nearby frequency resource set (e.g., on other component carriers (such as adjacent component carriers or nearby component carriers on frequencies)). In some cases, the UE may transmit an antenna switching SRS for the base station to obtain a downlink channel from an SRS signal assuming channel reciprocity. Additionally, when configuring the SRS, the base station may indicate some uses for the SRS, such as whether the SRS is used for beam management, codebook-based or non-codebook-based transmission, or antenna switching. However, current systems may not support indicating to the UE that the SRS is being used to derive downlink channel state information (CSI) for an associated bandwidth, which may be in a different bandwidth, bandwidth portion, carrier, frequency range, etc. Without knowing that the SRS is being used to determine the downlink CSI for the associated bandwidth, the UE may not consider the channel conditions or interference that may exist on the associated bandwidth when transmitting the SRS.

[0056] The various technologies described herein support enhanced reference signal sounding based on the association of SRS frequency resources with associated bandwidths and the base station indicating the association. When the UE is configured for an SRS for deriving downlink CSI for an associated bandwidth, the base station may send an indication of how the SRS is used. For example, the base station may indicate that the SRS is used to derive downlink CSI for an associated bandwidth. The indication may be explicit or implicit, indicating that the CSI is derived over bandwidths within an active bandwidth part (BWP), different BWPs, different component carriers of the same radio frequency spectrum band, or different component carriers of different radio frequency spectrum bands. In general, the indication may indicate to the UE that the SRS is being used to derive CSI on a specific frequency that replaces or is in addition to the frequency resources on which the SRS is transmitted. This may enable the UE to adjust the SRS transmission to align with channel conditions on other bandwidths. For example, the UE may apply a certain uplink precoding, make path loss adjustments, or adjust the spatial transmit beam.

[0057] Aspects of the disclosure are initially described in the context of wireless communication systems. Aspects of the disclosure are further illustrated and described by and with reference to apparatus diagrams, system diagrams, and flow diagrams related to reference signal resource association options for enhanced sounding.

[0058] Figure 1 An example of a wireless communication system 100 supporting reference signal resource association options for enhanced sounding according to various aspects of the present disclosure is illustrated. The wireless communication system 100 includes a base station 105, a UE 115, and a core network 130. In some examples, the wireless communication system 100 may be a long term evolution (LTE) network, an advanced LTE (LTE-A) network, an LTE-A Pro network, or a new radio (NR) network. In some cases, the wireless communication system 100 may support enhanced broadband communications, ultra-reliable (e.g., mission-critical) communications, low latency communications, or communications with low-cost and low-complexity devices.

[0059] The base station 105 may communicate wirelessly with the UE 115 via one or more base station antennas. The base station 105 described herein may include or may be referred to by those skilled in the art as a base transceiver station, a radio base station, an access point, a radio transceiver, a Node B, an evolved Node B (eNB), a next generation Node B, or a Gigabit Node B (any of which may be referred to as a gNB), a Home Node B, a Home Evolved Node B, or some other suitable terminology. The wireless communication system 100 may include different types of base stations 105 (e.g., macro cell base stations or small cell base stations). The UE 115 described herein may be able to communicate with various types of base stations 105 and network equipment (including macro eNBs, small cell eNBs, gNBs, relay base stations, etc.).

[0060] Each base station 105 may be associated with a particular geographic coverage area 110 in which it supports communications with various UEs 115. Each base station 105 may provide communications coverage for a respective geographic coverage area 110 via a communications link 125, and the communications link 125 between the base station 105 and the UE 115 may utilize one or more carriers. The communications link 125 shown in the wireless communication system 100 may include an uplink transmission from the UE 115 to the base station 105, or a downlink transmission from the base station 105 to the UE 115. Downlink transmissions may also be referred to as forward link transmissions, and uplink transmissions may also be referred to as reverse link transmissions.

[0061] The geographic coverage area 110 of the base station 105 may be divided into sectors that constitute a portion of the geographic coverage area 110, and each sector may be associated with a cellular cell. For example, each base station 105 may provide communication coverage for a macrocellular cell, a small cellular cell, a hotspot, or other types of cellular cells, or various combinations thereof. In some examples, the base station 105 may be mobile and therefore provide communication coverage for a mobile geographic coverage area 110. In some examples, different geographic coverage areas 110 associated with different technologies may overlap, and the overlapping geographic coverage areas 110 associated with different technologies may be supported by the same base station 105 or different base stations 105. The wireless communication system 100 may include, for example, a heterogeneous LTE / LTE-A / LTE-A Pro or NR network, in which different types of base stations 105 provide coverage for various geographic coverage areas 110.

[0062] The term "cell" refers to a logical communication entity used to communicate with base station 105 (e.g., on a carrier), and may be associated with an identifier to distinguish adjacent cells operating via the same or different carriers (e.g., physical cell identifier (PCID), virtual cell identifier (VCID)). In some examples, a carrier may support multiple cells, and different cells may be configured according to different protocol types that may provide access to different types of devices (e.g., machine type communication (MTC), narrowband Internet of Things (NB-IoT), enhanced mobile broadband (eMBB), or others). In some cases, the term "cell" may refer to a portion (e.g., a sector) of a geographic coverage area 110 on which the logical entity operates.

[0063] Each UE 115 can be dispersed throughout the wireless communication system 100, and each UE 115 can be stationary or mobile. UE 115 can also be referred to as a mobile device, a wireless device, a remote device, a handheld device, or a subscriber device, or some other suitable term, wherein "device" can also be referred to as a unit, a station, a terminal, or a client. UE 115 can also be a personal electronic device, such as a cellular phone, a personal digital assistant (PDA), a tablet computer, a laptop computer, or a personal computer. In some examples, UE 115 can also refer to a wireless local loop (WLL) station, an Internet of Things (IoT) device, an Internet of Everything (IoE) device, or an MTC device, etc., which can be implemented in various items (such as electrical appliances, vehicles, meters, etc.).

[0064] Some UEs 115, such as MTC or IoT devices, may be low-cost or low-complexity devices and may provide automated communication between machines (e.g., via machine-to-machine (M2M) communication). M2M communication or MTC may refer to data communication technology that allows devices to communicate with each other or with a base station 105 without human intervention. In some examples, M2M communication or MTC may include communications from devices that integrate sensors or meters to measure or capture information and relay the information to a central server or application, which may utilize the information or present the information to a person interacting with the program or application. Some UEs 115 may be designed to collect information or implement automated behavior of machines. Examples of applications for MTC devices include: smart metering, inventory monitoring, water level monitoring, equipment monitoring, health care monitoring, field survival monitoring, weather and geographic event monitoring, queue management and tracking, remote security sensing, physical access control, and transaction-based commercial charging.

[0065] Some UEs 115 may be configured to employ a reduced power consumption mode of operation, such as half-duplex communication (e.g., a mode that supports unidirectional communication via transmission or reception but not simultaneous transmission and reception). In some examples, half-duplex communication may be performed with a reduced peak rate. Other power saving techniques for UE 115 include entering a power saving "deep sleep" mode when not engaged in active communications, or operating over a limited bandwidth (e.g., in accordance with narrowband communications). In some cases, UE 115 may be designed to support critical functions (e.g., mission critical functions), and the wireless communication system 100 may be configured to provide ultra-reliable communications for these functions.

[0066] In some cases, UE 115 may also be able to communicate directly with other UE 115 (e.g., using a peer-to-peer (P2P) or device-to-device (D2D) protocol). One or more UEs in a group of UEs 115 utilizing D2D communication may be within the geographic coverage area 110 of the base station 105. Other UEs 115 in the group may be outside the geographic coverage area 110 of the base station 105, or may not be able to receive transmissions from the base station 105 for other reasons. In some cases, each group of UEs 115 communicating via D2D communication may utilize a one-to-many (1:M) system, in which each UE 115 transmits to each other UE 115 in the group. In some cases, the base station 105 facilitates the scheduling of resources for D2D communication. In other cases, D2D communication is performed between each UE 115 without involving the base station 105.

[0067] The base stations 105 may communicate with the core network 130 and with each other. For example, the base stations 105 may interface with the core network 130 via a backhaul link 132 (e.g., via S1, N2, N3, or other interfaces). The base stations 105 may communicate with each other over a backhaul link 134 (e.g., via X2, Xn, or other interfaces) directly (e.g., directly between the base stations 105) or indirectly (e.g., via the core network 130).

[0068] The core network 130 may provide user authentication, access authorization, tracking, Internet Protocol (IP) connectivity, and other access, routing, or mobility functions. The core network 130 may be an evolved packet core (EPC), which may include at least one mobility management entity (MME), at least one serving gateway (S-GW), and at least one packet data network (PDN) gateway (P-GW). The MME may manage non-access layer (e.g., control plane) functions such as mobility, authentication, and bearer management of UEs 115 served by base stations 105 associated with the EPC. User IP packets may be delivered through the S-GW, which itself may be connected to the P-GW. The P-GW may provide IP address allocation and other functions. The P-GW may be connected to network operator IP services. Operator IP services may include access to the Internet, an intranet, an IP multimedia subsystem (IMS), or packet switched (PS) streaming services.

[0069] At least some network devices (such as base stations 105) may include subcomponents, such as access network entities, which may be examples of access node controllers (ANCs). Each access network entity may communicate with each UE 115 through a number of other access network transport entities, which may be referred to as radio heads, smart radio heads, or transmission / reception points (TRPs). In some configurations, the various functions of each access network entity or base station 105 may be distributed across various network devices (e.g., radio heads and access network controllers) or merged into a single network device (e.g., base station 105).

[0070] The wireless communication system 100 may operate using one or more frequency bands, typically in the range of 300 megahertz (MHz) to 300 gigahertz (GHz). In general, the 300 MHz to 3 GHz region is referred to as the ultra-high frequency (UHF) region or decimeter band because the wavelengths are in the range of from about 1 decimeter to 1 meter long. UHF waves may be blocked or redirected by buildings and environmental features. However, these waves may penetrate various structures sufficiently for macro cells to provide services to UEs 115 located indoors. Transmission of UHF waves may be associated with smaller antennas and shorter ranges (e.g., less than 100 km) compared to transmission using lower frequencies and longer waves in the high frequency (HF) or very high frequency (VHF) portion of the spectrum below 300 MHz.

[0071] The wireless communication system 100 may also operate in the Super High Frequency (SHF) region using frequency bands from 3 GHz to 30 GHz, also known as centimeter bands. The SHF region includes frequency bands that may be opportunistically used by devices that may be able to tolerate interference from other users, such as the 5 GHz Industrial, Scientific, and Medical (ISM) band.

[0072] The wireless communication system 100 may also operate in the extremely high frequency (EHF) division of the spectrum (e.g., from 30 GHz to 300 GHz), which is also referred to as the millimeter band. In some examples, the wireless communication system 100 may support millimeter wave (mmW) communications between the UE 115 and the base station 105, and the EHF antenna of the corresponding device may be even smaller and more closely spaced than the UHF antenna. In some cases, this may facilitate the use of antenna arrays within the UE 115. However, the propagation of EHF transmissions may be subject to even greater atmospheric attenuation and shorter range than SHF or UHF transmissions. The technology disclosed herein may be adopted across transmissions using one or more different frequency divisions, and the use of frequency bands specified across these frequency divisions may differ by country or regulatory agency.

[0073] In some cases, the wireless communication system 100 may utilize both licensed and unlicensed radio frequency spectrum bands. For example, the wireless communication system 100 may employ license assisted access (LAA), LTE unlicensed (LTE-U) radio access technology, or NR technology in an unlicensed band (such as a 5 GHz ISM band). When operating in an unlicensed radio frequency spectrum band, wireless devices (such as base stations 105 and UE 115) may employ a listen-before-talk (LBT) procedure to ensure that the frequency channel is clear before transmitting data. In some cases, operations in unlicensed bands may be based on carrier aggregation configuration (e.g., LAA) in coordination with component carriers operating in licensed bands. Operations in unlicensed spectrum may include downlink transmissions, uplink transmissions, peer-to-peer transmissions, or a combination of these. Duplexing in unlicensed spectrum may be based on frequency division duplexing (FDD), time division duplexing (TDD), or a combination of the two.

[0074] In some examples, the base station 105 or the UE 115 may be equipped with multiple antennas, which may be used to employ techniques such as transmit diversity, receive diversity, multiple-input multiple-output (MIMO) communication, or beamforming. For example, the wireless communication system 100 may use a transmission scheme between a transmitting device (e.g., the base station 105) and a receiving device (e.g., the UE 115), wherein the transmitting device is equipped with multiple antennas and the receiving device is equipped with one or more antennas. MIMO communication may employ multipath signal propagation to increase spectral efficiency by transmitting or receiving multiple signals via different spatial layers, which may be referred to as spatial multiplexing. For example, the transmitting device may transmit multiple signals via different antennas or different antenna combinations. Similarly, the receiving device may receive multiple signals via different antennas or different antenna combinations. Each of these multiple signals may be referred to as a separate spatial stream and may carry bits associated with the same data stream (e.g., the same codeword) or different data streams. Different spatial layers may be associated with different antenna ports for channel measurement and reporting. MIMO technology includes single-user MIMO (SU-MIMO), in which multiple spatial layers are transmitted to the same receiving device, and multi-user MIMO (MU-MIMO), in which multiple spatial layers are transmitted to multiple devices.

[0075] Beamforming (which may also be referred to as spatial filtering, directional transmission, or directional reception) is a signal processing technique that may be used at a transmitting device or a receiving device (e.g., a base station 105 or a UE 115) to shape or direct an antenna beam (e.g., a transmit beam or a receive beam) along a spatial path between the transmitting device and the receiving device. Beamforming may be achieved by combining signals communicated via antenna elements of an antenna array so that signals propagating at a particular orientation relative to the antenna array experience constructive interference, while other signals experience destructive interference. Adjustments to signals communicated via antenna elements may include the transmitting device or the receiving device applying a particular amplitude and phase shift to the signal carried via each antenna element associated with the device. Adjustments associated with each antenna element may be defined by a set of beamforming weights associated with a particular orientation (e.g., relative to the antenna array of the transmitting device or the receiving device, or relative to some other orientation).

[0076] In one example, the base station 105 may use multiple antennas or antenna arrays to perform beamforming operations for directional communication with the UE 115. For example, some signals (e.g., synchronization signals, reference signals, beam selection signals, or other control signals) may be transmitted multiple times by the base station 105 in different directions, which may include a signal being transmitted according to different beamforming weight sets associated with different transmission directions. The transmissions in different beam directions may be used (e.g., by the base station 105 or a receiving device, such as the UE 115) to identify the beam direction used by the base station 105 for subsequent transmission and / or reception.

[0077] Some signals, such as data signals associated with a particular recipient device, may be transmitted by base station 105 in a single beam direction (e.g., a direction associated with a recipient device, such as UE 115). In some examples, a beam direction associated with transmissions along a single beam direction may be determined based at least in part on signals transmitted in different beam directions. For example, UE 115 may receive one or more signals transmitted by base station 105 in different directions, and UE 115 may report to base station 105 an indication of the signals received by it with the highest signal quality or other acceptable signal quality. Although these techniques are described with reference to signals transmitted by base station 105 in one or more directions, UE 115 may use similar techniques for transmitting signals multiple times in different directions (e.g., for identifying a beam direction used by UE 115 for subsequent transmission or reception) or for transmitting signals in a single direction (e.g., for transmitting data to a recipient device).

[0078] A receiving device (e.g., UE 115, which may be an example of a mmW receiving device) may try multiple receive beams when receiving various signals (such as synchronization signals, reference signals, beam selection signals, or other control signals) from base station 105. For example, the receiving device may try multiple receive directions by receiving via different antenna subarrays, processing received signals according to different antenna subarrays, receiving according to different receive beamforming weight sets applied to signals received at multiple antenna elements of an antenna array, or processing received signals according to different receive beamforming weight sets applied to signals received at multiple antenna elements of an antenna array, any of which may be referred to as "listening" according to different receive beams or receive directions. In some examples, the receiving device may use a single receive beam to receive along a single beam direction (e.g., when receiving a data signal). A single receive beam may be aligned in a beam direction determined based at least in part on listening according to different receive beam directions (e.g., a beam direction determined to have the highest signal strength, highest signal-to-noise ratio, or other acceptable signal quality based at least in part on listening according to multiple beam directions).

[0079] In some cases, the antennas of a base station 105 or a UE 115 may be located within one or more antenna arrays that may support MIMO operations or transmit or receive beamforming. For example, one or more base station antennas or antenna arrays may be co-located at an antenna assembly, such as an antenna tower. In some cases, the antennas or antenna arrays associated with a base station 105 may be located at different geographic locations. A base station 105 may have an antenna array having several rows and columns of antenna ports that the base station 105 may use to support beamforming for communications with a UE 115. Similarly, a UE 115 may have one or more antenna arrays that may support various MIMO or beamforming operations.

[0080] In some cases, the wireless communication system 100 may be a packet-based network that operates according to a layered protocol stack. In the user plane, the communication of the bearer or packet data convergence protocol (PDCP) layer may be IP-based. The radio link control (RLC) layer may perform packet segmentation and reassembly to communicate on a logical channel. The media access control (MAC) layer may perform priority handling and multiplex logical channels into transport channels. The MAC layer may also use a hybrid automatic repeat request (HARQ) to provide retransmission of the MAC layer, thereby improving link efficiency. In the control plane, the radio resource control (RRC) protocol layer may provide the establishment, configuration and maintenance of an RRC connection for a radio bearer that supports user plane data between UE115 and base station 105 or core network 130. At the physical layer, transport channels may be mapped to physical channels.

[0081] In some cases, UE 115 and base station 105 may support retransmission of data to increase the likelihood that the data is successfully received. HARQ feedback is a technique that increases the likelihood of correctly receiving data on communication link 125. HARQ may include a combination of error detection (e.g., using cyclic redundancy check (CRC)), forward error correction (FEC), and retransmission (e.g., automatic repeat request (ARQ)). HARQ can improve the throughput of the MAC layer in poor radio conditions (e.g., signal-to-noise ratio conditions). In some cases, a wireless device may support simultaneous slot HARQ feedback, where the device may provide HARQ feedback in a specific time slot for data received in a previous symbol in the time slot. In other cases, the device may provide HARQ feedback in a subsequent time slot or according to some other time interval.

[0082] The time interval in LTE or NR can be represented by a basic time unit (which may refer to a sampling period T, for example). s =1 / 30,720,000 seconds). The time intervals of the communication resources may be organized according to radio frames each having a duration of 10 milliseconds (ms), where the frame period may be expressed as T f =307,200T s . A radio frame may be identified by a system frame number (SFN) ranging from 0 to 1023. Each frame may include 10 subframes numbered from 0 to 9, and each subframe may have a duration of 1 ms. A subframe may be further divided into 2 slots, each slot having a duration of 0.5 ms, and each slot may contain 6 or 7 modulation symbol periods (e.g., depending on the length of a cyclic prefix prepended to each symbol period). Excluding the cyclic prefix, each symbol period may contain 2048 sampling periods. In some cases, a subframe may be the minimum scheduling unit of the wireless communication system 100 and may be referred to as a transmission time interval (TTI). In other cases, the minimum scheduling unit of the wireless communication system 100 may be shorter than a subframe or may be dynamically selected (e.g., in a burst of a shortened TTI (sTTI) or in a selected component carrier using sTTI).

[0083] In some wireless communication systems, a time slot may be further divided into a plurality of mini-slots containing one or more symbols. In some instances, a symbol of a mini-slot or a mini-slot may be the minimum scheduling unit. For example, each symbol may vary in duration depending on the subcarrier spacing or the operating frequency band. Further, some wireless communication systems may implement time slot aggregation, wherein a plurality of time slots or mini-slots are aggregated together and used for communication between UE 115 and base station 105.

[0084] The term "carrier" refers to a set of radio frequency spectrum resources having a defined physical layer structure for supporting communications on the communication link 125. For example, a carrier of the communication link 125 may include a portion of a radio frequency spectrum band that operates according to a physical layer channel for a given radio access technology. Each physical layer channel may carry user data, control information, or other signaling. A carrier may be associated with a predefined frequency channel (e.g., an Evolved Universal Mobile Telecommunications System Terrestrial Radio Access (E-UTRA) Absolute Radio Frequency Channel Number (EARFCN)) and may be located according to a channel grid for discovery by a UE 115. A carrier may be downlink or uplink (e.g., in FDD mode), or configured to carry downlink communications and uplink communications (e.g., in TDD mode). In some examples, a signal waveform transmitted on a carrier may include multiple subcarriers (e.g., using a multi-carrier modulation (MCM) technique such as orthogonal frequency division multiplexing (OFDM) or discrete Fourier transform spread OFDM (DFT-S-OFDM)).

[0085] For different radio access technologies (e.g., LTE, LTE-A, LTE-A Pro, NR), the organizational structure of the carrier can be different. For example, the communication on the carrier can be organized according to TTIs or time slots, each of which can include user data and control information or signaling to support decoding of the user data. The carrier can also include dedicated acquisition signaling (e.g., synchronization signals or system information, etc.) and control signaling to coordinate the operation of the carrier. In some examples (e.g., in a carrier aggregation configuration), the carrier may also have acquisition signaling or control signaling to coordinate the operation of other carriers.

[0086] Physical channels may be multiplexed on a carrier according to various techniques. Physical control channels and physical data channels may be multiplexed on a downlink carrier, for example, using a time division multiplexing (TDM) technique, a frequency division multiplexing (FDM) technique, or a hybrid TDM-FDM technique. In some examples, control information transmitted in a physical control channel may be distributed in a cascaded manner between different control regions (e.g., between a common control region or a common search space and one or more UE-specific control regions or UE-specific search spaces).

[0087] A carrier may be associated with a particular bandwidth of the radio frequency spectrum, and in some examples, the carrier bandwidth may be referred to as the "system bandwidth" of the carrier or wireless communication system 100. For example, the carrier bandwidth may be one of a plurality of predetermined bandwidths of a carrier for a particular radio access technology (e.g., 1.4, 3, 5, 10, 15, 20, 40, or 80 MHz). In some examples, each served UE 115 may be configured to operate on part or all of the carrier bandwidth. In other examples, some UEs 115 may be configured to operate using a narrowband protocol type associated with a predefined portion or range (e.g., a set of subcarriers or RBs) within a carrier (e.g., an "in-band" deployment of a narrowband protocol type).

[0088] In a system using MCM technology, a resource element may include a symbol period (e.g., the duration of a modulation symbol) and a subcarrier, where the symbol period and the subcarrier spacing are inversely related. The number of bits carried by each resource element may depend on the modulation scheme (e.g., the order of the modulation scheme). Thus, the more resource elements received by UE 115 and the higher the order of the modulation scheme, the higher the data rate of UE 115 can be. In a MIMO system, wireless communication resources may refer to a combination of radio frequency spectrum resources, time resources, and space resources (e.g., space layers), and the use of multiple space layers may further increase the data rate of communication with UE 115.

[0089] A device (e.g., base station 105 or UE 115) of wireless communication system 100 may have a hardware configuration that supports communication on a particular carrier bandwidth, or may be configurable to support communication on one of a set of carrier bandwidths. In some examples, wireless communication system 100 may include base stations 105 and / or UEs 115 that support simultaneous communication via carriers associated with more than one different carrier bandwidths.

[0090] The wireless communication system 100 may support communication with the UE 115 on multiple cells or carriers, a feature that may be referred to as carrier aggregation or multi-carrier operation. The UE 115 may be configured with multiple downlink component carriers and one or more uplink component carriers according to a carrier aggregation configuration. Carrier aggregation may be used with both FDD and TDD component carriers.

[0091] In some cases, the wireless communication system 100 may utilize an enhanced component carrier (eCC). An eCC may be characterized by one or more features including a wider carrier or frequency channel bandwidth, a shorter symbol duration, a shorter TTI duration, or a modified control channel configuration. In some cases, an eCC may be associated with a carrier aggregation configuration or a dual connectivity configuration (e.g., when multiple serving cells have suboptimal or non-ideal backhaul links). An eCC may also be configured for use in an unlicensed spectrum or a shared spectrum (e.g., where more than one operator is allowed to use the spectrum). An eCC characterized by a wide carrier bandwidth may include one or more segments that may be utilized by a UE 115 that is not capable of monitoring the entire carrier bandwidth or is otherwise configured to use a limited carrier bandwidth (e.g., to save power).

[0092] In some cases, an eCC may utilize a different symbol duration than other component carriers, which may include using a reduced symbol duration compared to the symbol duration of other component carriers. A shorter symbol duration may be associated with an increased spacing between adjacent subcarriers. A device utilizing an eCC (such as a UE 115 or a base station 105) may transmit a wideband signal (e.g., according to a frequency channel or carrier bandwidth of 20, 40, 60, 80 MHz, etc.) with a reduced symbol duration (e.g., 16.67 microseconds). A TTI in an eCC may include one or more symbol periods. In some cases, the TTI duration (i.e., the number of symbol periods in a TTI) may be variable.

[0093] The wireless communication system 100 may be an NR system that may utilize any combination of licensed, shared, and unlicensed spectrum bands, etc. The flexibility of eCC symbol duration and subcarrier spacing may allow eCC to be used across multiple spectrums. In some examples, NR shared spectrum may improve spectrum utilization and spectrum efficiency, particularly through dynamic vertical (e.g., across frequency domain) and horizontal (e.g., across time domain) sharing of resources.

[0094] In some wireless communication systems, such as the wireless communication system 100, the UE 115 may transmit an SRS to the base station 105 on an uplink channel, and the base station 105 may determine the channel condition of the uplink channel based on the SRS. The UE 115 may not be supported to transmit SRS on all carriers or frequencies of the wireless communication system 100, but due to partial channel reciprocity, channel estimates on closely spaced component carriers may be correlated. Therefore, SRS transmissions on one component carrier may be used for downlink beamforming on other component carriers, such as adjacent component carriers or component carriers that are nearby in frequency.

[0095] The UE 115 and base station 105 described herein may implement various techniques to support enhanced reference signal sounding based on the association of SRS frequency resources with associated bandwidths and based on indications about the association. When the UE 115 is configured for an SRS used to derive downlink CSI for an associated bandwidth, the base station 105 may send an indication of how the SRS is used. In general, the indication may indicate to the UE 115 that the SRS is being used to derive CSI on a specific frequency that replaces or is in addition to the frequency resources on which the SRS is transmitted. The indication may be explicit or implicit, indicating that the CSI is derived over bandwidths within an active BWP, a different BWP, different component carriers of the same radio frequency spectrum band, or different component carriers of different radio frequency spectrum bands. This may enable the UE 115 to adjust the SRS transmission to align with channel conditions on other bandwidths. For example, the UE 115 may apply a certain uplink precoding, make a path loss adjustment, or adjust the spatial transmit beam.

[0096] Figure 2 An example of a wireless communication system 200 that supports reference signal resource association options for enhanced sounding according to aspects of the present disclosure is illustrated. In some examples, the wireless communication system 200 can implement aspects of the wireless communication system 100. The wireless communication system 200 can include a UE 115-a and a base station 105-a, which can be a reference signal resource association option. Figure 1 Examples of corresponding devices described.

[0097] The base station 105-a may configure component carriers for the UE 115-a. For example, the UE 115-a may be configured with an uplink carrier 205 (e.g., CC0) and a downlink carrier 210 (e.g., CC1). Although the communication between the UE 115-a and the base station 105-a is shown as an example of FDD communication, the techniques described herein may also be applicable to TDD communication.

[0098] The wireless communication system 200 can support a variety of different ways to provide channel measurements or determine channel state information. For example, the base station 105-a can transmit a CSI-RS to the UE 115-a on a downlink channel. The UE 115-a can receive the CSI-RS, measure the downlink channel based on the CSI-RS, and provide a CSI report to the base station 105-a based on the measurement. SRS can be transmitted in another example of channel measurement technology, in which the UE 115-a can transmit the SRS to the base station 105-a on an uplink channel. The base station 105-a can receive the SRS and perform channel measurements based on the SRS. Based on the channel measurement, the base station 105-a can adjust the channel configuration, mobility configuration, or other configuration for the UE 115-a.

[0099] SRS may have multiple uses for uplink communications. For example, SRS may be used for uplink beam management, codebook-based uplink transmission, and non-codebook-based uplink transmission. For beam management, UE 115-a may apply different transmit beams to different SRS resources, and base station 105-a may determine the uplink transmit beam for UE 115-a based on SRS. For codebook-based uplink transmission, base station 105-a may determine an SRS resource identifier (SRI), a transmission rank indicator (TRI), and a transmission precoder matrix indicator (TPMI) based on the SRS resources, and UE 115-a may determine a PUSCH transmission precoder based on feedback from base station 105-a. For non-codebook-based uplink transmission, base station 105-a may indicate a downlink CSI-RS for UE 115-a to calculate an uplink precoder, and UE 115-a may adopt a candidate uplink precoder to transmit a beamformed SRS. UE 115 - a may determine the uplink shared channel precoder and transmission rank based on the wideband SRI field in the downlink control information from base station 105 - a .

[0100] For some uplink communication purposes, there may be a link between the downlink CSI-RS and the uplink SRS for UE 115-a to generate an SRS precoder matrix based on the associated downlink CSI-RS. For example, some systems may support a link between the downlink CSI-RS and the SRS for non-codebook based uplink transmissions and a spatial relationship between the CSI-RS and the SRS for uplink beam management. The CSI-RS (e.g., non-zero power (NZP) CSI-RS) may be associated with the SRS for non-codebook based uplink communications to assist UE 115-a in deriving the uplink precoder. If a higher layer parameter (e.g., SRS-ResourceSet) is configured to indicate that the SRS is used for non-codebook based uplink transmissions (e.g., if SRS-ResourceSet is set to 'nonCodebook'), the UE 115 may be configured with a single NZP CSI-RS resource for the SRS resource set. If the SRS is aperiodic and associated with an aperiodic NZP CSIRS resource, the scheduling DCI may not be used for cross-carrier or cross-BWP scheduling, and the CSI-RS may be located in the same slot as the SRS request field. If the UE 115 is configured with an aperiodic SRS associated with an aperiodic NZP CSI-RS resource, any TCI state configured in the scheduling component carrier may not be configured for Type D QCL association. In addition, when associating CSI-RS with SRS for non-codebook uplink transmissions, the CSI-RS resources may be configured on the same component carrier as the SRS resources.

[0101] In some cases, SRS may also be used for downlink communications. For example, SRS may be transmitted for base station 105-a to obtain a downlink channel from an SRS signal assuming downlink / uplink channel reciprocity. In some cases, UE 115-a may be configured with multiple SRS resources that may have different frequencies, and UE 115-a may transmit SRS on the multiple SRS resources by applying antenna switching. Antenna switching SRS may be used by base station 105-a to obtain or implement a downlink channel by estimating an uplink SRS channel and using downlink / uplink channel reciprocity. Antenna switching for SRS may support UE 115-a to transmit SRS on a component carrier that is not configured with an uplink. For example, UE 115-a may be able to sound antenna switching SRS on a downlink carrier that is not configured with uplink resources. Some conventional systems may not support a link between SRS and CSI-RS for downlink communication purposes (e.g., for base station 105 to estimate a downlink channel based on channel reciprocity).

[0102] UE 115-a may not be able to transmit SRS on all carriers or frequencies of the system. For example, some carriers used by UE 115-a may be configured for downlink communication rather than uplink communication. However, some channels configured for UE115-a may have at least partial reciprocity, so that channel estimates on closely spaced component carriers may be related. Therefore, SRS transmission on one component carrier may be used for downlink beamforming on other component carriers (such as adjacent component carriers). In one example, SRS on one component carrier may be useful for downlink beamforming W1 vectors on other adjacent component carriers, such as for type IICSI. Similarly, in an FDD system, an SRS-based precoding vector may be used as a W1 vector for downlink type IICSI. In some cases, SRS-based CSI determination using partial reciprocity in an FDD system can provide performance similar to TDD reciprocity. The wireless communication system 200 can support enhancements for sounding technology so that partial reciprocity enhancements can be provided for both FDD and multi-carrier TDD systems.

[0103] Therefore, in some systems, an antenna switching SRS may be transmitted for the base station 105 to obtain a downlink channel from the SRS signal assuming DL-UL reciprocity. The base station 105 may indicate some uses for the SRS, such as whether the SRS is used for beam management, codebook-based or non-codebook-based transmission, or antenna switching. However, the base station 105 of these systems may not be able to indicate to the UE 115 that the SRS is being used to derive downlink CSI for an associated bandwidth, which may be in another bandwidth, bandwidth portion, carrier, frequency range, etc. In contrast, the antenna switching SRS of these conventional systems may always be in the same component carrier, and the UE 115 may not be aware that the antenna switching SRS is being used to derive downlink CSI. Without knowing that the SRS is being used for downlink CSI for an associated bandwidth, the SRS transmission may not take into account the channel conditions and interference that may exist on the associated bandwidth.

[0104] By implementing the various techniques described herein, the wireless communication system 200 can support an enhanced sounding procedure. In general, when the base station 105 uses SRS transmission to acquire a downlink channel, the wireless communication system can support an association between a frequency resource set used for SRS transmission and another frequency resource set. The base station 105 can acquire channel state information of the associated frequency resources based on the SRS and the partial channel reciprocity between the frequency resource set and the associated frequency resources for the SRS.

[0105] When UE 115-a is configured for an SRS on an SRS resource 220 that is used to derive downlink CSI for an associated bandwidth 225, the base station 105-a may send an indication that the SRS is used to derive downlink CSI for the associated bandwidth. This may enable UE 115-a to adjust the SRS transmission to align the conditions of the SRS resource 220 with the channel conditions on the associated bandwidth 225. For example, UE 115-a may apply some uplink precoding, make path loss adjustments, or adjust spatial transmit beams. For example, if the downlink carrier 210 is known to have highly directional interference, the SRS on the uplink carrier 205 may be precoded in a direction orthogonal to the interference on the downlink carrier 210, such as on an SRS resource that may be configured to serve as a downlink beam initiator (e.g., a W1 beam) on the downlink carrier 210.

[0106] The SRS resources 220 may be associated with bandwidths of different carriers. For example, the SRS resources 220 may be on the uplink carrier 205, and the associated resources 225 may be on the downlink carrier 210. The base station 105-a may transmit an indication to the UE 115-a that the CSI is derived over a bandwidth within an active BWP, a different BWP, a different component carrier of the same frequency band, or a different component carrier of a different frequency band. In some cases, one or more bandwidths, bandwidth portions, component carriers, radio frequency spectrum bands, or CSI-RS bandwidths may be examples of associated bandwidths 225. The associated bandwidth 225 may or may not be an example of a CSI-RS bandwidth 215. In some cases, the associated bandwidth 225 may at least partially overlap with the CSI-RS bandwidth 215, or the associated bandwidth 225 may not overlap with the CSI-RS bandwidth 215.

[0107] In some cases, SRS resources configured for downlink CSI acquisition (eg, antenna switching SRS) may have an association with the associated bandwidth 225. For example, other SRS resources (eg, not used for downlink CSI acquisition) may not have this association.

[0108] In some cases, if the SRS is associated with the NZP CSI-RS, the two resources may be jointly configured or activated. The base station 105-a may send signaling to configure or activate the two resources in the bundle. For example, the base station 105-a may configure the SRS resources 220 and the CSI-RS bandwidth 215 with a single signaling. The resources may be jointly configured to ensure that there is a certain reciprocity (e.g., Doppler, delay power profile (PDP), etc.) for periodic or semi-periodic situations. For example, the base station 105-a may configure the CSI-RS and SRS to have the same periodicity and within a certain number of time slots of the corresponding configured time slot offset. In some cases, the semi-periodic CSI-RS and the semi-periodic SRS may be activated by the same MAC CE command.

[0109] The association between the SRS resource 220 and the associated bandwidth 225 may be indicated explicitly or implicitly. In some cases, the SRS resource 220 may be associated with a bandwidth index or identifier for which the SRS is used for CSI derivation. The association may be associated with one or more bandwidth part identifiers, component carrier identifiers, or radio frequency spectrum band identifiers used to perform downlink CSI acquisition. In some cases, the association may be associated with one or more NZP CSI-RS resources, CSI report configurations, or CSI-RS resource settings, which may correspond to specific BWP identifiers, component carrier identifiers, or radio frequency spectrum band identifiers. The association may be indicated when the UE 115-a is configured with resources for SRS transmission, when the UE 115-a is configured with resources for CSI-RS, or when both.

[0110] In some cases, the gap between the center bandwidth of SRS resources 220 and the associated bandwidth 225 (or multiple associated bandwidths) may be within a gap that is signaled with UE capabilities. For example, UE 115-a may transmit an indicator regarding UE capabilities, and the UE capabilities may indicate a maximum bandwidth gap for which UE 115-a may perform association. In some cases, UE capabilities may indicate whether UE 115-a may perform association on a per-band basis.

[0111] In one example, the base station 105-a may configure the UE 115-a with an SRS resource 220 on the uplink carrier 205. The base station 105-a may send an indication of an association between the SRS resource 220 and the associated bandwidth 225. In some cases, the base station 105-a may indicate that the SRS transmitted on the SRS resource 220 is used to acquire CSI for the associated bandwidth 225. The UE 115-a may then determine a set of parameters for transmitting the SRS on the SRS resource 220. For example, the UE 115-a may determine an uplink precoder to be used to transmit the SRS. In some cases, the UE 115-a may adjust the SRS transmission so that the channel conditions of the SRS resource 220 reflect the channel conditions of the associated bandwidth 225. The UE 115-a may then apply the determined transmission parameters and transmit the SRS on the SRS resource 220 (e.g., using an uplink precoder determined based on the association).

[0112] The base station 105-a may receive the SRS on the SRS resource 220. The base station 105-a may perform channel estimation for the associated bandwidth 225 based on the SRS on the SRS resource 220. For example, based on partial channel reciprocity between the SRS resource 220 and the associated bandwidth 225, the SRS on the SRS resource 220 may be used to acquire CSI for the associated bandwidth 225. In some cases, the base station 105-a may perform CSI acquisition based on the association. For example, the base station 105-a may account for some possible differences between the SRS resource 220 and the associated bandwidth 225.

[0113] Figure 3 1 illustrates examples of bandwidth association configurations 300, 301, and 302 that support reference signal resource association options for enhanced sounding in accordance with aspects of the present disclosure. In some examples, the bandwidth association configurations 300, 301, and 302 can implement aspects of the wireless communication system 100. The bandwidth association configurations 300, 301, and 302 can illustrate wireless communications between a UE 115 and a base station 105, as described with reference to FIG. Figure 1 and Figure 2 as described.

[0114] Each configuration generally describes an association between an SRS frequency resource and an associated frequency resource, wherein the SRS frequency resource and the associated frequency resource may have at least partial channel reciprocity. The association may be configured such that the base station 105 may acquire CSI for the associated frequency resource based on the UE 115 transmitting an SRS on the SRS frequency resource using partial frequency information. The base station 105 may transmit an explicit or implicit indication that the SRS is used to acquire CSI on the associated bandwidth. In some cases, the UE 115 may adjust the SRS transmission to align with the channel conditions on the associated bandwidth.

[0115] In some examples, there may be an asymmetric downlink / uplink configuration. For example, there may be a different number of downlink carriers than uplink carriers. Bandwidth association configurations 300, 301, and 302 illustrate different examples of SRS association configurations in an asymmetric configuration.

[0116] The bandwidth association configuration 300 may include two downlink carriers, including CC1 305 and CC2 310. The bandwidth association configuration 300 may illustrate an example of a first scenario of enhanced sounding in an asymmetric configuration of two downlink carriers and one uplink carrier, where the UE 115 transmits SRS on the two downlink carriers via antenna switching 330. The UE 115 may be supported to transmit antenna-switched SRS on the SRS bandwidth 320. For example, the UE 115-a may be configured to transmit SRS on the SRS bandwidth 320-a in CC1 305 and the SRS bandwidth 320-b in CC2 310 by performing antenna switching 330. These SRS bandwidths 320 may be configured to be associated with an associated bandwidth 325. The base station 105 may obtain CSI for the associated bandwidth 325 based on extrapolating the sounded SRS on the SRS bandwidth 320.

[0117] The bandwidth association configuration 301 may include two downlink carriers CC1 305 and CC2 310. The bandwidth association configuration 301 may illustrate another example of this first scenario of enhanced sounding in an asymmetric configuration of two downlink carriers and one uplink carrier, where the UE 115 transmits SRS on the two downlink carriers via antenna switching 345. The UE 115 may be supported to transmit antenna switching SRS on the SRS bandwidth 335. For example, the UE 115-a may be configured to transmit SRS on the SRS bandwidth 335-a in CC1 305 and the SRS bandwidth 335-b in CC2 310 by performing antenna switching 345. These SRS bandwidths 335 may be configured to be associated with an associated bandwidth 340, which may be outside the downlink carrier. The base station 105 may obtain CSI for the associated bandwidth 340 based on interpolating the sounded SRS on the SRS bandwidth 335.

[0118] The bandwidth association configuration 302 may include two downlink carriers (including CC1 305 and CC2 310) and one uplink carrier CC0 315. The bandwidth association configuration 300 may illustrate an example of a second scenario of enhanced sounding in an asymmetric configuration of two downlink carriers and one uplink carrier, where the UE 115 transmits SRS only on the uplink carrier (e.g., CC0 315). The UE 115-a may be configured to transmit SRS on an SRS bandwidth 350 in CC0 315, which may be associated with an associated bandwidth 355. In some cases, the associated bandwidth 355 may be outside of a component carrier (e.g., CC0 315) of the uplink configuration. In some examples, the associated bandwidth 355 may span multiple component carriers (e.g., spanning CC1 305 and CC2 310). The base station 105 may acquire CSI for the associated bandwidth 355 based on the SRS transmitted on the SRS bandwidth 350.

[0119] Figure 4 An example of a process flow 400 for supporting reference signal resource association options for enhanced sounding in accordance with aspects of the present disclosure is illustrated. In some examples, the process flow 400 may implement aspects of the wireless communication system 100. The process flow 400 may include a UE 115-b and a base station 105-b, which may be respective examples of a UE 115 and a base station 105 as described herein.

[0120] At 405, base station 105-b may transmit a configuration to UE 115-b that identifies a first set of frequency resources for UE 115-a to use to transmit an SRS to be used at least for downlink CSI acquisition. The first set of resources may be an example of an SRS resource or an SRS frequency resource as described herein. At 410, base station 105-b may transmit an indication of an association between the first set of frequency resources and a second set of frequency resources used by the UE to acquire channel state information. The second set of frequency resources may be an example of an associated bandwidth as described herein.

[0121] In some cases, the first set of frequency resources and the second set of frequency resources may include different bandwidths, bandwidth portions, component carriers, radio frequency spectrum bands, or any combination thereof. In some examples, the second set of frequency resources may include one or more bandwidths, bandwidth portions, component carriers, or radio frequency spectrum bands. For example, the second set of frequency resources may include frequency resources that are not included in the first set of frequency resources. In some other examples, the second set of resources may be a superset of the first set of frequency resources. In some cases, the base station 105-b may transmit an indication of a configuration of resources for a CSI-RS, wherein the indication of the association is based on the configuration for the CSI-RS.

[0122] At 415, UE 115-b may determine values ​​of one or more SRS transmission parameters for the first set of frequency resources based on the association. In some cases, the transmission parameters may be determined based on a measurement of channel quality or interference or both of a received physical channel or a received physical signal or both within the second set of frequency resources. At 420, UE 115-b may transmit the SRS on the first set of frequency resources based on the determined one or more values. In some examples, UE 115-b may determine an uplink precoder for transmitting the SRS based on the association between the first set of frequency resources and the second set of frequency resources. UE 115-b may apply the uplink precoder when transmitting the SRS on the first set of frequency resources.

[0123] The base station 105-b may receive the SRS on the first set of frequency resources based on the association. The base station 105-b may determine channel state information of at least the second set of frequency resources based on the received SRS. In some cases, the base station 105-b may determine the channel state information of the second set of frequency resources based on at least partial channel reciprocity between the first set of frequency resources and the second set of frequency resources.

[0124] Figure 5 A block diagram 500 of a device 505 supporting a reference signal resource association option for enhanced sounding according to aspects of the present disclosure is shown. The device 505 may be an example of aspects of a UE 115 as described herein. The device 505 may include a receiver 510, a communication manager 515, and a transmitter 520. The device 505 may also include a processor. Each of these components may be in communication with each other (e.g., via one or more buses).

[0125] The receiver 510 may receive information such as packets, user data, or control information associated with various information channels (e.g., control channels, data channels, and information related to reference signal resource association options for enhanced sounding, etc.). The information may be passed to other components of the device 505. The receiver 510 may be a reference signal receiver. Figure 8 Examples of aspects of the described transceiver 820. The receiver 510 may utilize a single antenna or a collection of antennas.

[0126] The communication manager 515 may receive a configuration identifying a first set of frequency resources for transmitting a sounding reference signal to be used at least for downlink channel state information acquisition; receive an indication of an association between the configuration for the sounding reference signal and a second set of frequency resources; determine values ​​of one or more sounding reference signal transmission parameters for the first set of frequency resources based on the association; and transmit the sounding reference signal on the first set of frequency resources based on the determined one or more values. The communication manager 515 may be an example of aspects of the communication manager 810 described herein.

[0127] The communication manager 515 or its subcomponents may be implemented in hardware, in code (e.g., software or firmware) executed by a processor, or any combination thereof. If implemented in code executed by a processor, the functions of the communication manager 515 or its subcomponents may be performed by a general purpose processor, a DSP, an application specific integrated circuit (ASIC), an FPGA or other programmable logic device designed to perform the functions described in the present disclosure, discrete gate or transistor logic, discrete hardware components, or any combination thereof.

[0128] The communication manager 515 or its subcomponents may be physically located at various locations, including being distributed such that portions of functionality are implemented by one or more physical components at different physical locations. In some examples, according to various aspects of the present disclosure, the communication manager 515 or its subcomponents may be separate and distinct components. In some examples, according to various aspects of the present disclosure, the communication manager 515 or its subcomponents may be combined with one or more other hardware components, including but not limited to input / output (I / O) components, a transceiver, a network server, another computing device, one or more other components described in the present disclosure, or a combination thereof.

[0129] The transmitter 520 may transmit signals generated by other components of the device 505. In some examples, the transmitter 520 may be co-located with the receiver 510 in a transceiver module. For example, the transmitter 520 may be a reference Figure 8 Examples of aspects of the described transceiver 820. The transmitter 520 may utilize a single antenna or a collection of antennas.

[0130] Figure 6 A block diagram 600 of a device 605 supporting a reference signal resource association option for enhanced sounding according to aspects of the present disclosure is shown. The device 605 may be an example of aspects of the device 505 or UE 115 as described herein. The device 605 may include a receiver 610, a communication manager 615, and a transmitter 640. The device 605 may also include a processor. Each of these components may be in communication with each other (e.g., via one or more buses).

[0131] The receiver 610 may receive information such as packets, user data, or control information associated with various information channels (e.g., control channels, data channels, and information related to reference signal resource association options for enhanced sounding, etc.). The information may be passed to other components of the device 605. The receiver 610 may be a reference signal receiving device. Figure 8 Examples of aspects of the described transceiver 820. The receiver 610 may utilize a single antenna or a collection of antennas.

[0132] The communication manager 615 can be an example of aspects of the communication manager 515 as described herein. The communication manager 615 can include an SRS configuration component 620, an association indication component 625, an SRS transmission parameter component 630, and an SRS transmission component 635. The communication manager 615 can be an example of aspects of the communication manager 810 described herein.

[0133] The SRS configuration component 620 may receive a configuration identifying a first set of frequency resources for transmitting a sounding reference signal to be used at least for downlink channel state information acquisition. The association indication component 625 may receive an indication of an association between the configuration for the sounding reference signal and the second set of frequency resources. The SRS transmission parameter component 630 may determine the value of one or more sounding reference signal transmission parameters of the first set of frequency resources based on the association. The SRS transmission component 635 may transmit a sounding reference signal on the first set of frequency resources based on the determined one or more values.

[0134] The transmitter 640 may transmit signals generated by other components of the device 605. In some examples, the transmitter 640 may be co-located with the receiver 610 in a transceiver module. For example, the transmitter 640 may be a reference Figure 8 Examples of aspects of the described transceiver 820. The transmitter 640 may utilize a single antenna or a collection of antennas.

[0135] Figure 7 A block diagram 700 of a communication manager 705 supporting reference signal resource association options for enhanced sounding in accordance with aspects of the present disclosure is shown. The communication manager 705 can be an example of aspects of the communication manager 515, the communication manager 615, or the communication manager 810 described herein. The communication manager 705 can include an SRS configuration component 710, an association indication component 715, an SRS transmission parameter component 720, an SRS transmission component 725, a CSI-RS configuration component 730, a UE capability component 735, and an SRS priority component 740. Each of these modules can communicate directly or indirectly with each other (e.g., via one or more buses).

[0136] SRS configuration component 710 may receive a configuration identifying a first set of frequency resources for transmitting a sounding reference signal to be used for at least downlink channel state information acquisition.Association indication component 715 may receive an indication of an association between the configuration for a sounding reference signal and a second set of frequency resources.

[0137] In some examples, the association indication component 715 can identify that the first set of frequency resources and the second set of frequency resources are in the same bandwidth portion, different bandwidth portions, different component carriers of the same radio frequency spectrum band, or different component carriers of different radio frequency spectrum bands. In some cases, the second set of frequency resources includes frequency resources that are not included in the first set of frequency resources. In some cases, the second set of frequency resources is a superset of the first set of frequency resources.

[0138] In some cases, the first set of frequency resources and the second set of frequency resources include different bandwidths, bandwidth portions, component carriers, radio frequency spectrum bands, or any combination thereof. In some cases, an indication of an association between the first set of frequency resources and the second set of frequency resources is received along with a configuration identifying the first set of frequency resources for transmitting a sounding reference signal.

[0139] The SRS transmission parameter component 720 can determine the value of one or more sounding reference signal transmission parameters of the first frequency resource set based on the association. In some examples, the SRS transmission parameter component 720 can determine one or more uplink precoders for transmitting the sounding reference signal based on the association between the first frequency resource set and the second frequency resource set. In some examples, the SRS transmission parameter component 720 can apply the one or more uplink precoders when transmitting the sounding reference signal on the first frequency resource set. In some cases, the determination of the transmission parameters can be based at least in part on the measurement of the channel quality or interference or both of the physical channel received or the received physical signal or both within the second frequency resource set. In some cases, one or more sounding reference signal transmission parameters include one or more uplink precoders, uplink transmit power, one or more spatial transmission directions, or any combination thereof.

[0140] The SRS transmitting component 725 may transmit a sounding reference signal on a first set of frequency resources based on the determined one or more values. In some cases, the first set of frequency resources corresponds to a first resource subset within a first downlink component carrier and a second resource subset within a second downlink component carrier, and wherein a set of transmission opportunities for transmitting the sounding reference signal on the first downlink component carrier and the second downlink component carrier is based on a sounding reference signal carrier switching indication triggered by a third uplink component carrier. In some cases, the second set of frequency resources includes a bandwidth that is higher in frequency than a resource subset of the first downlink component carrier, and the bandwidth is lower in frequency than a resource subset of the second downlink component carrier.

[0141] The CSI-RS configuration component 730 can receive a configuration identifying resources to be used to receive a channel state information reference signal, wherein the indication of the association is based on the configuration for the channel state information reference signal. In some examples, the CSI-RS configuration component 730 can receive a channel state information reference signal, wherein values ​​of one or more sounding reference signal transmission parameters are determined based on the received channel state information reference signal.

[0142] In some examples, CSI-RS configuration component 730 can receive a configuration for one or more channel state information reference signals associated with a second set of frequency resources jointly with a configuration identifying a first set of frequency resources, wherein an association between the first set of frequency resources and the second set of frequency resources is determined based on the jointly received configuration. In some examples, CSI-RS configuration component 730 can receive a media access control control element that activates a semi-persistent opportunity for the first set of frequency resources and the second set of frequency resources.

[0143] The UE capability component 735 may transmit an indication of UE capabilities associated with a frequency domain gap between a first frequency resource set and a second frequency resource set. The SRS priority component 740 may identify the sounding reference signal as having a higher priority than other sounding reference signals based on the configuration of the second frequency resource set and the sounding reference signal used for downlink channel state information acquisition. In some examples, it is determined that the second frequency resource set includes frequency resources within one or more different bandwidth parts or within one or more component carriers, or frequency resources that are not part of the first frequency resource set, wherein the sounding reference signal is identified as having a higher priority than other sounding reference signals based on the second frequency resource set including frequency resources within one or more different bandwidth parts or within one or more component carriers, or frequency resources that are not part of the first frequency resource set. In some cases, the higher priority is associated with a higher priority regarding a reduction in transmission power due to carrier aggregation power scaling priority.

[0144] Figure 8 A diagram of a system 800 including a device 805 supporting a reference signal resource association option for enhanced sounding according to aspects of the present disclosure is shown. The device 805 may be an example of a device 505, a device 605, or a UE 115 as described herein or include a component of the device 505, the device 605, or the UE 115. The device 805 may include components for two-way voice and data communications, including components for transmitting and receiving communications, including a communication manager 810, an I / O controller 815, a transceiver 820, an antenna 825, a memory 830, and a processor 840. These components may be in electronic communication via one or more buses (e.g., a bus 845).

[0145] The communication manager 810 can receive a configuration that identifies a first set of frequency resources for transmitting a sounding reference signal to be used at least for downlink channel state information acquisition; receive an indication of an association between the configuration for the sounding reference signal and a second set of frequency resources; determine values ​​of one or more sounding reference signal transmission parameters of the first set of frequency resources based on the association; and transmit the sounding reference signal on the first set of frequency resources based on the determined one or more values.

[0146] I / O controller 815 can manage input and output signals of device 805. I / O controller 815 can also manage peripheral devices that are not integrated into device 805. In some cases, I / O controller 815 can represent a physical connection or port to an external peripheral device. In some cases, I / O controller 815 can utilize an operating system, such as Or another known operating system. In other cases, I / O controller 815 may represent or interact with a modem, keyboard, mouse, touch screen, or similar device. In some cases, I / O controller 815 may be implemented as part of a processor. In some cases, a user may interact with device 815 via I / O controller 805 or via hardware components controlled by I / O controller 815.

[0147] The transceiver 820 may communicate bidirectionally via one or more antennas, wired or wireless links, as described above. For example, the transceiver 820 may represent a wireless transceiver and may communicate bidirectionally with another wireless transceiver. The transceiver 820 may also include a modem to modulate packets and provide the modulated packets to an antenna for transmission, and demodulate packets received from an antenna.

[0148] In some cases, a wireless device may include a single antenna 825. However, in some cases, the device may have more than one antenna 825, which may be capable of transmitting or receiving multiple wireless transmissions concurrently.

[0149] The memory 830 may include RAM and ROM. The memory 830 may store computer-readable, computer-executable code 835 including instructions that, when executed, cause the processor to perform the various functions described herein. In some cases, the memory 830 may include, among other things, a BIOS that may control basic hardware or software operations, such as interaction with peripheral components or devices.

[0150] The processor 840 may include an intelligent hardware device (e.g., a general purpose processor, a DSP, a CPU, a microcontroller, an ASIC, an FPGA, a programmable logic device, a discrete gate or transistor logic component, a discrete hardware component, or any combination thereof). In some cases, the processor 840 may be configured to operate a memory array using a memory controller. In other cases, the memory controller may be integrated into the processor 840. The processor 840 may be configured to execute computer-readable instructions stored in a memory (e.g., memory 830) to cause the device 805 to perform various functions (e.g., various functions or tasks that support the reference signal resource association option for enhanced sounding).

[0151] The code 835 may include instructions for implementing various aspects of the present disclosure, including instructions for supporting wireless communications. The code 835 may be stored in a non-transitory computer-readable medium, such as a system memory or other type of memory. In some cases, the code 835 may not be directly executed by the processor 840, but may cause a computer (e.g., when compiled and executed) to perform the functions described herein.

[0152] Fig. 9 A block diagram 900 of a device 905 supporting a reference signal resource association option for enhanced sounding according to aspects of the present disclosure is shown. The device 905 may be an example of aspects of a base station 105 as described herein. The device 905 may include a receiver 910, a communication manager 915, and a transmitter 920. The device 905 may also include a processor. Each of these components may be in communication with each other (e.g., via one or more buses).

[0153] The receiver 910 may receive information such as packets, user data, or control information associated with various information channels (e.g., control channels, data channels, and information related to reference signal resource association options for enhanced sounding, etc.). The information may be passed to other components of the device 905. The receiver 910 may be a reference signal receiving device. Fig.12 Examples of various aspects of the described transceiver 1220. The receiver 910 may utilize a single antenna or a collection of antennas.

[0154] The communication manager 915 may transmit a configuration to the UE, the configuration identifying a first set of frequency resources for the UE to transmit a sounding reference signal to be used at least for downlink channel state information acquisition; transmit an indication of an association between the first set of frequency resources and a second set of frequency resources; based on the association, receive a sounding reference signal from the UE on the first set of frequency resources; and determine channel state information of at least the second set of frequency resources based on the received sounding reference signal. The communication manager 915 may be an example of aspects of the communication manager 1210 described herein.

[0155] The communication manager 915 or its subcomponents may be implemented in hardware, in code (e.g., software or firmware) executed by a processor, or any combination thereof. If implemented in code executed by a processor, the functions of the communication manager 915 or its subcomponents may be performed by a general purpose processor, a DSP, an application specific integrated circuit (ASIC), an FPGA or other programmable logic device designed to perform the functions described in the present disclosure, discrete gate or transistor logic, discrete hardware components, or any combination thereof.

[0156] The communication manager 915 or its subcomponents may be physically located at various locations, including being distributed such that portions of functionality are implemented by one or more physical components at different physical locations. In some examples, according to various aspects of the present disclosure, the communication manager 915 or its subcomponents may be separate and distinct components. In some examples, according to various aspects of the present disclosure, the communication manager 915 or its subcomponents may be combined with one or more other hardware components, including but not limited to input / output (I / O) components, a transceiver, a network server, another computing device, one or more other components described in the present disclosure, or a combination thereof.

[0157] The transmitter 920 may transmit signals generated by other components of the device 905. In some examples, the transmitter 920 may be co-located with the receiver 910 in a transceiver module. For example, the transmitter 920 may be a reference Fig.12 Examples of various aspects of the described transceiver 1220. The transmitter 920 may utilize a single antenna or a collection of antennas.

[0158] Fig.10 A block diagram 1000 of a device 1005 supporting a reference signal resource association option for enhanced sounding according to aspects of the present disclosure is shown. The device 1005 may be an example of aspects of the device 905 or base station 105 as described herein. The device 1005 may include a receiver 1010, a communication manager 1015, and a transmitter 1040. The device 1005 may also include a processor. Each of these components may be in communication with each other (e.g., via one or more buses).

[0159] The receiver 1010 may receive information such as packets, user data, or control information associated with various information channels (e.g., control channels, data channels, and information related to reference signal resource association options for enhanced sounding, etc.). The information may be passed to other components of the device 1005. The receiver 1010 may be a reference signal receiving device. Fig.12 Examples of various aspects of the described transceiver 1220. The receiver 1010 may utilize a single antenna or a collection of antennas.

[0160] The communication manager 1015 may be an example of aspects of the communication manager 915 as described herein. The communication manager 1015 may include an SRS configuration component 1020, an association indication component 1025, an SRS receiving component 1030, and a CSI determining component 1035. The communication manager 1015 may be an example of aspects of the communication manager 1210 described herein.

[0161] The SRS configuration component 1020 may transmit a configuration to the UE that identifies a first set of frequency resources for the UE to transmit a sounding reference signal to be used at least for downlink channel state information acquisition. The association indication component 1025 may transmit an indication of an association between the first set of frequency resources and the second set of frequency resources. The SRS reception component 1030 may receive a sounding reference signal from the UE on the first set of frequency resources based on the association. The CSI determination component 1035 may determine channel state information of at least the second set of frequency resources based on the received sounding reference signal.

[0162] Transmitter 1040 can transmit signals generated by other components of device 1005. In some examples, transmitter 1040 can be co-located with receiver 1010 in a transceiver module. For example, transmitter 1040 can be a reference Fig.12 Examples of various aspects of the described transceiver 1220. The transmitter 1040 may utilize a single antenna or a collection of antennas.

[0163] Fig.11 A block diagram 1100 of a communication manager 1105 supporting reference signal resource association options for enhanced sounding in accordance with aspects of the present disclosure is shown. The communication manager 1105 can be an example of aspects of the communication manager 915, the communication manager 1015, or the communication manager 1210 described herein. The communication manager 1105 can include an SRS configuration component 1110, an association indication component 1115, an SRS reception component 1120, a CSI determination component 1125, a CSI-RS configuration component 1130, and a UE capabilities component 1135. Each of these modules can communicate directly or indirectly with each other (e.g., via one or more buses).

[0164] SRS configuration component 1110 can transmit a configuration to a UE that identifies a first set of frequency resources for the UE to use to transmit a sounding reference signal to be used for at least downlink channel state information acquisition.

[0165] The association indication component 1115 can transmit an indication of an association between a first set of frequency resources and a second set of frequency resources. In some cases, the first set of frequency resources and the second set of frequency resources include different bandwidths, bandwidth portions, component carriers, radio frequency spectrum bands, or any combination thereof. In some cases, the association indication first set of frequency resources and second set of frequency resources are in the same bandwidth portion, different bandwidth portions, different component carriers of the same radio frequency spectrum band, or different component carriers of different radio frequency spectrum bands. In some cases, the indication of the association between the first set of frequency resources and the second set of frequency resources is received together with a configuration identifying the first set of frequency resources for transmitting a sounding reference signal.

[0166] The SRS receiving component 1120 can receive a sounding reference signal from the UE on a first set of frequency resources based on the association. In some cases, the first set of frequency resources includes a first uplink component carrier and a second downlink component carrier, and wherein the sounding reference signal is received on the first uplink component carrier and the second downlink component carrier based on a sounding reference signal carrier switching.

[0167] The CSI determining component 1125 can determine channel state information for at least a second set of frequency resources based on the received sounding reference signal. The CSI-RS configuring component 1130 can transmit an indication of a configuration of resources for a channel state information reference signal, wherein the indication of the association is based on the configuration for the channel state information reference signal.

[0168] In some examples, the CSI-RS configuration component 1130 can transmit a configuration for one or more channel state information reference signals associated with the second set of frequency resources jointly with a configuration identifying the first set of frequency resources, wherein the association between the first set of frequency resources and the second set of frequency resources is implicitly indicated based on the jointly transmitted configuration. In some examples, the CSI-RS configuration component 1130 can transmit a media access control control element for activating a semi-persistent opportunity for the first set of frequency resources and the second set of frequency resources. The UE capability component 1135 can receive an indication of a UE capability associated with a gap between the first set of frequency resources and the second set of frequency resources, wherein the configuration identifying the first set of frequency resources is based on the UE capability.

[0169] Fig.12A diagram of a system 1200 including a device 1205 supporting a reference signal resource association option for enhanced sounding according to aspects of the present disclosure is shown. The device 1205 may be an example of a device 905, a device 1005, or a base station 105 as described herein or include components of the above devices. The device 1205 may include components for two-way voice and data communications, including components for transmitting and receiving communications, including a communication manager 1210, a network communication manager 1215, a transceiver 1220, an antenna 1225, a memory 1230, a processor 1240, and an inter-station communication manager 1245. These components may be in electronic communication via one or more buses (e.g., bus 1250).

[0170] The communication manager 1210 can transmit a configuration to the UE, which identifies a first frequency resource set for the UE to transmit a sounding reference signal to be used at least for downlink channel state information acquisition; transmit an indication of an association between the first frequency resource set and a second frequency resource set; based on the association, receive a sounding reference signal from the UE on the first frequency resource set; and determine channel state information of at least the second frequency resource set based on the received sounding reference signal.

[0171] The network communications manager 1215 may manage communications with the core network (eg, via one or more wired backhaul links). For example, the network communications manager 1215 may manage the delivery of data communications for client devices, such as one or more UEs 115.

[0172] The transceiver 1220 may communicate bidirectionally via one or more antennas, wired or wireless links, as described above. For example, the transceiver 1220 may represent a wireless transceiver and may communicate bidirectionally with another wireless transceiver. The transceiver 1220 may also include a modem to modulate packets and provide the modulated packets to an antenna for transmission, and demodulate packets received from an antenna.

[0173] In some cases, a wireless device may include a single antenna 1225. However, in some cases, the device may have more than one antenna 1225, which may be capable of transmitting or receiving multiple wireless transmissions concurrently.

[0174] The memory 1230 may include RAM, ROM, or a combination thereof. The memory 1230 may store computer readable code 1235 including instructions that, when executed by a processor (e.g., processor 1240), cause the device to perform various functions described herein. In some cases, the memory 1230 may include, among other things, a BIOS that may control basic hardware or software operations, such as interaction with peripheral components or devices.

[0175] The processor 1240 may include an intelligent hardware device (e.g., a general purpose processor, a DSP, a CPU, a microcontroller, an ASIC, an FPGA, a programmable logic device, a discrete gate or transistor logic component, a discrete hardware component, or any combination thereof). In some cases, the processor 1240 may be configured to operate a memory array using a memory controller. In some cases, the memory controller may be integrated into the processor 1240. The processor 1240 may be configured to execute computer-readable instructions stored in a memory (e.g., memory 1230) to cause the device 1205 to perform various functions (e.g., various functions or tasks that support the reference signal resource association option for enhanced sounding).

[0176] The inter-site communication manager 1245 may manage communications with other base stations 105 and may include a controller or scheduler for controlling communications with UE 115 in cooperation with other base stations 105. For example, the inter-site communication manager 1245 may coordinate the scheduling of transmissions to UE 115 for various interference mitigation techniques such as beamforming or joint transmission. In some examples, the inter-site communication manager 1245 may provide an X2 interface within an LTE / LTE-A wireless communication network technology to provide communications between base stations 105.

[0177] The code 1235 may include instructions for implementing various aspects of the present disclosure, including instructions for supporting wireless communications. The code 1235 may be stored in a non-transitory computer-readable medium, such as a system memory or other type of memory. In some cases, the code 1235 may not be directly executed by the processor 1240, but may cause a computer (e.g., when compiled and executed) to perform the functions described herein.

[0178] Fig.13 1 is a flow chart illustrating a method 1300 for supporting reference signal resource association options for enhanced sounding according to aspects of the present disclosure. The operations of the method 1300 may be implemented by a UE 115 or components thereof as described herein. For example, the operations of the method 1300 may be implemented by a UE 115 or components thereof as described herein. Figures 5 to 8 In some examples, the UE may execute an instruction set to control the functional elements of the UE to perform the following functions. Additionally or alternatively, the UE may use dedicated hardware to perform various aspects of the following functions.

[0179] At 1305, the UE may receive a configuration that identifies a first set of frequency resources for transmitting a sounding reference signal to be used for at least downlink channel state information acquisition. The operations of 1305 may be performed according to the methods described herein. In some examples, aspects of the operations of 1305 may be performed as described in reference to Figures 5 to 8 The described SRS configuration components are executed.

[0180] At 1310, the UE may receive an indication of an association between a configuration for a sounding reference signal and a second set of frequency resources. The operations of 1310 may be performed according to the methods described herein. In some examples, aspects of the operations of 1310 may be performed as described with reference to Figures 5 to 8 The described associations instruct the components to perform.

[0181] At 1315, the UE may determine values ​​of one or more sounding reference signal transmission parameters for the first set of frequency resources based on the association. The operations of 1315 may be performed according to the methods described herein. In some examples, aspects of the operations of 1315 may be performed as described in reference to Figures 5 to 8 The described SRS transmission parameter components are performed.

[0182] At 1320, the UE may transmit a sounding reference signal on a first set of frequency resources based on the determined one or more values. The operations of 1320 may be performed according to the methods described herein. In some examples, aspects of the operations of 1320 may be performed as described in reference to Figures 5 to 8 The described SRS transmission component is performed.

[0183] Fig.14 1 is a flow chart illustrating a method 1400 for supporting reference signal resource association options for enhanced sounding according to aspects of the present disclosure. The operations of the method 1400 may be implemented by a UE 115 or components thereof as described herein. For example, the operations of the method 1400 may be implemented by a UE 115 or components thereof as described herein. Figures 5 to 8 In some examples, the UE may execute an instruction set to control the functional elements of the UE to perform the following functions. Additionally or alternatively, the UE may use dedicated hardware to perform various aspects of the following functions.

[0184] At 1405, the UE may receive a configuration that identifies a first set of frequency resources for transmitting a sounding reference signal to be used for at least downlink channel state information acquisition. The operations of 1405 may be performed according to the methods described herein. In some examples, aspects of the operations of 1405 may be performed as described in reference to Figures 5 to 8 The described SRS configuration components are executed.

[0185] At 1410, the UE may receive an indication of an association between a configuration for a sounding reference signal and a second set of frequency resources. The operations of 1410 may be performed according to the methods described herein. In some examples, aspects of the operations of 1410 may be performed as described with reference to Figures 5 to 8 The described associations instruct the components to perform.

[0186] At 1415, the UE may determine values ​​of one or more sounding reference signal transmission parameters for the first set of frequency resources based on the association. The operations of 1415 may be performed according to the methods described herein. In some examples, aspects of the operations of 1415 may be performed as described in reference to Figures 5 to 8 The described SRS transmission parameter components are performed.

[0187] At 1420, the UE may determine one or more uplink precoders for transmitting a sounding reference signal based on an association between the first set of frequency resources and the second set of frequency resources. The operations of 1420 may be performed according to the methods described herein. In some examples, aspects of the operations of 1420 may be performed as described in reference to Figures 5 to 8 The described SRS transmission parameter components are performed.

[0188] At 1425, the UE may apply the one or more uplink precoders when transmitting a sounding reference signal on the first set of frequency resources. The operations of 1425 may be performed according to the methods described herein. In some examples, aspects of the operations of 1425 may be performed as described in reference to Figures 5 to 8 The described SRS transmission parameter components are performed.

[0189] At 1430, the UE may transmit a sounding reference signal on a first set of frequency resources based on the determined one or more values. The operations of 1430 may be performed according to the methods described herein. In some examples, aspects of the operations of 1430 may be performed as described in reference to Figures 5 to 8 The described SRS transmission component is performed.

[0190] Fig.15 1 is a flow chart illustrating a method 1500 for supporting reference signal resource association options for enhanced sounding according to aspects of the present disclosure. The operations of the method 1500 may be implemented by a UE 115 or components thereof as described herein. For example, the operations of the method 1500 may be implemented by a UE 115 or components thereof as described herein. Figures 5 to 8 In some examples, the UE may execute an instruction set to control the functional elements of the UE to perform the following functions. Additionally or alternatively, the UE may use dedicated hardware to perform various aspects of the following functions.

[0191] At 1505, the UE may transmit an indication of UE capabilities associated with a frequency domain gap between a first set of frequency resources and a second set of frequency resources. The operations of 1505 may be performed according to the methods described herein. In some examples, aspects of the operations of 1505 may be performed as described with reference to Figures 5 to 8 The UE capability components described are used to perform the above operations.

[0192] At 1510, the UE may receive a configuration that identifies a first set of frequency resources for transmitting a sounding reference signal to be used for at least downlink channel state information acquisition. The operations of 1510 may be performed according to the methods described herein. In some examples, aspects of the operations of 1510 may be performed as described in reference to Figures 5 to 8 The described SRS configuration components are executed.

[0193] At 1515, the UE may receive an indication of an association between a configuration for a sounding reference signal and a second set of frequency resources. The operations of 1515 may be performed according to the methods described herein. In some examples, aspects of the operations of 1515 may be performed as described with reference to Figures 5 to 8 The described associations instruct the components to perform.

[0194] At 1520, the UE may determine values ​​of one or more sounding reference signal transmission parameters for the first set of frequency resources based on the association. The operations of 1520 may be performed according to the methods described herein. In some examples, aspects of the operations of 1520 may be performed as described in reference to Figures 5 to 8 The described SRS transmission parameter components are performed.

[0195] At 1525, the UE may transmit a sounding reference signal on a first set of frequency resources based on the determined one or more values. The operations of 1525 may be performed according to the methods described herein. In some examples, aspects of the operations of 1525 may be performed as described in reference to Figures 5 to 8 The described SRS transmission component is performed.

[0196] Fig.16 A flow chart illustrating a method 1600 for supporting reference signal resource association options for enhanced sounding according to aspects of the present disclosure is shown. The operations of the method 1600 may be implemented by a base station 105 or components thereof as described herein. For example, the operations of the method 1600 may be implemented by a base station 105 or components thereof as described herein. Figures 9 to 12 In some examples, the base station may execute an instruction set to control the functional elements of the base station to perform the functions described below. Additionally or alternatively, the base station may use dedicated hardware to perform various aspects of the functions described below.

[0197] At 1605, the base station may transmit a configuration to the UE, the configuration identifying a first set of frequency resources for the UE to use to transmit a sounding reference signal to be used at least for downlink channel state information acquisition. The operations of 1605 may be performed according to the methods described herein. In some examples, aspects of the operations of 1605 may be performed as described in reference to Figures 9 to 12 The described SRS configuration components are executed.

[0198] At 1610, the base station may transmit an indication of an association between the first set of frequency resources and the second set of frequency resources. The operations of 1610 may be performed according to the methods described herein. In some examples, aspects of the operations of 1610 may be performed as described with reference to Figures 9 to 12 The described associations instruct the components to perform.

[0199] At 1615, the base station may receive a sounding reference signal from the UE on the first set of frequency resources based on the association. The operations of 1615 may be performed according to the methods described herein. In some examples, aspects of the operations of 1615 may be performed as described with reference to Figures 9 to 12 The SRS receiving component described is executed.

[0200] At 1620, the base station may determine channel state information of at least a second set of frequency resources based on the received sounding reference signal. The operations of 1620 may be performed according to the methods described herein. In some examples, aspects of the operations of 1620 may be performed as described with reference to Figures 9 to 12 The CSI determination component described is performed.

[0201] It should be noted that the methods described herein describe possible implementations, and that the various operations and steps may be rearranged or otherwise modified and other implementations are possible. Furthermore, aspects from two or more methods may be combined.

[0202] The technology described herein can be used in various wireless communication systems, such as code division multiple access (CDMA), time division multiple access (TDMA), frequency division multiple access (FDMA), orthogonal frequency division multiple access (OFDMA), single carrier frequency division multiple access (SC-FDMA) and other systems. CDMA systems can implement radio technologies such as CDMA2000, Universal Terrestrial Radio Access (UTRA). CDMA2000 covers IS-2000, IS-95 and IS-856 standards. IS-2000 versions are generally referred to as CDMA2000 1X, 1X, etc. IS-856 (TIA-856) is generally referred to as CDMA2000 1xEV-DO, High Rate Packet Data (HRPD), etc. UTRA includes Wideband CDMA (WCDMA) and other variants of CDMA. TDMA systems can implement radio technologies such as Global System for Mobile Communications (GSM).

[0203] OFDMA systems can implement radio technologies such as Ultra Mobile Broadband (UMB), Evolved UTRA (E-UTRA), Institute of Electrical and Electronics Engineers (IEEE) 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802.20, Flash-OFDM, etc. UTRA and E-UTRA are part of Universal Mobile Telecommunications System (UMTS). LTE, LTE-A, and LTE-A Pro are versions of UMTS that use E-UTRA. UTRA, E-UTRA, UMTS, LTE, LTE-A, LTE-A Pro, NR, and GSM are described in documents from an organization named "3rd Generation Partnership Project" (3GPP). CDMA2000 and UMB are described in documents from an organization named "3rd Generation Partnership Project 2" (3GPP2). The techniques described herein may be used for systems and radio technologies mentioned herein as well as for other systems and radio technologies. Although aspects of LTE, LTE-A, LTE-A Pro, or NR systems may be described for example purposes and LTE, LTE-A, LTE-A Pro, or NR terminology may be used in much of the description, the techniques described herein may also be applicable to applications other than LTE, LTE-A, LTE-A Pro, or NR applications.

[0204] A macro cell generally covers a relatively large geographic area (e.g., a radius of several kilometers) and may allow unrestricted access by UEs with service subscriptions to a network provider. A small cell may be associated with a lower power base station (compared to a macro cell), and the small cell may operate in the same or different (e.g., licensed, unlicensed, etc.) frequency band as the macro cell. According to various examples, a small cell may include a pico cell, a femto cell, and a micro cell. A pico cell, for example, may cover a smaller geographic area and may allow unrestricted access by UEs with service subscriptions to a network provider. A femto cell may also cover a smaller geographic area (e.g., a residence) and may provide restricted access by UEs associated with the femto cell (e.g., UEs in a closed subscriber group (CSG), UEs of users in the residence, etc.). An eNB for a macro cell may be referred to as a macro eNB. An eNB for a small cell may be referred to as a small cell eNB, a pico eNB, a femto eNB, or a home eNB. An eNB may support one or more (eg, two, three, four, etc.) cells and may also support communication using one or more component carriers.

[0205] The wireless communication systems described herein may support synchronous or asynchronous operation. For synchronous operation, each base station may have similar frame timing, and transmissions from different base stations may be roughly aligned in time. For asynchronous operation, each base station may have different frame timing, and transmissions from different base stations may not be aligned in time. The techniques described herein may be used for synchronous or asynchronous operation.

[0206] The information and signals described herein may be represented using any of a variety of different techniques and technologies. For example, data, instructions, commands, information, signals, bits, symbols, and chips that may be referred to throughout this description may be represented by voltages, currents, electromagnetic waves, magnetic fields or particles, optical fields or particles, or any combination thereof.

[0207] The various illustrative blocks and modules described in conjunction with the disclosure herein may be implemented or executed with a general purpose processor, a DSP, an ASIC, an FPGA or other programmable logic device, discrete gate or transistor logic, discrete hardware components, or any combination thereof designed to perform the functions described herein. A general purpose processor may be a microprocessor, but in an alternative, the processor may be any conventional processor, controller, microcontroller, or state machine. The processor may also be implemented as a combination of computing devices (e.g., a combination of a DSP and a microprocessor, a plurality of microprocessors, one or more microprocessors in conjunction with a DSP core, or any other such configuration).

[0208] The functions described herein may be implemented in hardware, software executed by a processor, firmware, or any combination thereof. If implemented in software executed by a processor, the functions may be stored on or transmitted by a computer-readable medium as one or more instructions or codes. Other examples and implementations fall within the scope of the present disclosure and the appended claims. For example, due to the nature of software, the functions described herein may be implemented using software executed by a processor, hardware, firmware, hardwiring, or any combination thereof. Features that implement the functions may also be physically located in various locations, including being distributed so that parts of the functions are implemented at different physical locations.

[0209] Computer-readable medium includes both non-transient computer storage medium and communication medium, and it includes any medium that facilitates computer program to transfer from one place to another place.Non-transient storage medium can be any available medium that can be accessed by general or special-purpose computer.As an example and not limitation, non-transient computer-readable medium can include random access memory (RAM), read-only memory (ROM), electrically erasable programmable ROM (EEPROM), flash memory, compact disk (CD) ROM or other optical disk storage, disk storage or other magnetic storage device, or can be used to carry or store instruction or data structure form of desired program code means and can be accessed by general or special-purpose computer or general or special-purpose processor any other non-transient medium.Similarly, any connection is also properly referred to as computer-readable medium.For example, if software is transmitted from website, server or other remote source using coaxial cable, optical fiber cable, twisted pair, digital subscriber line (DSL) or wireless technology such as infrared, radio and microwave, then the coaxial cable, optical fiber cable, twisted pair, DSL or wireless technology such as infrared, radio and microwave are just included in the definition of medium. Disk and disc as used herein include CDs, laser discs, optical discs, digital versatile discs (DVDs), floppy disks, and Blu-ray discs, where disks usually reproduce data magnetically, while discs reproduce data optically with lasers. Combinations of the above are also included within the scope of computer-readable media.

[0210] As used herein (including in the claims), "or" used in a list of items (e.g., a list of items with a phrase such as "at least one of" or "one or more of") indicates an inclusive list, so that, for example, a list of at least one of A, B, or C means A or B or C or AB or AC or BC or ABC (i.e., A and B and C). Similarly, as used herein, the phrase "based on" should not be interpreted as referring to a closed set of conditions. For example, an exemplary step described as being based on condition "A" may be based on both condition A and condition B without departing from the scope of the present disclosure. In other words, as used herein, the phrase "based on" should be interpreted in the same manner as the phrase "based at least in part on."

[0211] In the accompanying drawings, similar components or features may have the same reference number. In addition, various components of the same type may be distinguished by following the reference number with a dash and a second reference number that distinguishes between similar components. If only the first reference number is used in the specification, the description may apply to any of the similar components having the same first reference number regardless of the second reference number, or other subsequent reference numbers.

[0212] The descriptions set forth herein in conjunction with the accompanying drawings describe example configurations and do not represent all examples that may be implemented or that fall within the scope of the claims. The term "exemplary" as used herein means "used as an example, instance, or illustration" and does not mean "better than" or "better than other examples." This detailed description includes specific details to provide an understanding of the described techniques. However, these techniques may be practiced without these specific details. In some instances, well-known structures and devices are shown in block diagram form to avoid obscuring the concepts of the described examples.

[0213] The description herein is provided to enable those skilled in the art to make or use the present disclosure. Various modifications to the present disclosure will be apparent to those skilled in the art, and the universal principles defined herein may be applied to other variations without departing from the scope of the present disclosure. Thus, the present disclosure is not limited to the examples and designs described herein, but should be granted the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A method for wireless communication at a user equipment (UE), comprising: transmitting an indication of UE capabilities associated with a gap between a first set of frequency resources and a second set of frequency resources; receiving a configuration, the configuration identifying the first set of frequency resources for transmitting a sounding reference signal to be used at least for downlink channel state information acquisition; receiving an indication of an association between the configuration for the sounding reference signal and the second set of frequency resources; determining, based at least in part on the association, values ​​of one or more sounding reference signal transmission parameters for the first set of frequency resources; as well as Based at least in part on the determined one or more values, the sounding reference signal is transmitted on the first set of frequency resources.

2. The method of claim 1, wherein: The determination of the transmission parameter is based at least in part on measuring channel quality, interference, or both of a received physical channel or a received physical signal, or both, within the second set of frequency resources.

3. The method of claim 1, wherein: The second frequency resource set includes frequency resources not included in the first frequency resource set.

4. The method of claim 1, wherein: The second frequency resource set is a superset of the first frequency resource set.

5. The method of claim 1, wherein: Determining the value of the one or more sounding reference signal transmission parameters further comprises: determining one or more uplink precoders for transmitting the sounding reference signal based at least in part on the association between the first set of frequency resources and the second set of frequency resources; and The one or more uplink precoders are applied when transmitting the sounding reference signal on the first set of frequency resources.

6. The method of claim 1, wherein: The one or more sounding reference signal transmission parameters include one or more uplink precoders, uplink transmit power, one or more spatial transmit directions, or any combination thereof.

7. The method of claim 1, further comprising: A configuration identifying resources to be used to receive a channel state information reference signal is received, wherein the indication of the association is based at least in part on the configuration for the channel state information reference signal.

8. The method of claim 7, further comprising: The channel state information reference signal is received, wherein values ​​of the one or more sounding reference signal transmission parameters are determined based at least in part on the received channel state information reference signal.

9. The method of claim 1, further comprising: A configuration for one or more channel state information reference signals associated with the second set of frequency resources is received jointly with the configuration identifying the first set of frequency resources, wherein the association between the first set of frequency resources and the second set of frequency resources is determined at least in part based on the jointly received configuration.

10. The method of claim 9, further comprising: A medium access control element is received that activates a semi-persistent opportunity for the first set of frequency resources and the second set of frequency resources.

11. The method of claim 1, wherein: The first set of frequency resources and the second set of frequency resources include different bandwidths, bandwidth parts, component carriers, radio frequency spectrum bands or any combination thereof.

12. The method of claim 1, further comprising: Identify that the first frequency resource set and the second frequency resource set are in the same bandwidth part, different bandwidth parts, different component carriers of the same radio frequency spectrum band, or different component carriers of different radio frequency spectrum bands.

13. The method of claim 1, wherein: The first set of frequency resources corresponds to a first subset of resources within a first downlink component carrier and a second subset of resources within a second downlink component carrier, and wherein a plurality of transmission opportunities for the sounding reference signal are transmitted on the first downlink component carrier and the second downlink component carrier based at least in part on a sounding reference signal carrier switching indication triggered by a third uplink component carrier.

14. The method of claim 13, wherein: The second set of frequency resources includes a bandwidth having a higher frequency than a resource subset of the first downlink component carrier, and the bandwidth having a lower frequency than a resource subset of the second downlink component carrier.

15. The method of claim 1, further comprising: The sounding reference signal is identified as having a higher priority than other sounding reference signals based at least in part on the configuration of the second set of frequency resources and the sounding reference signal used for downlink channel state information acquisition.

16. The method of claim 15, further comprising: and determining that the second set of frequency resources includes frequency resources within one or more different bandwidth parts or within one or more component carriers, or frequency resources that are not part of the first set of frequency resources, wherein the sounding reference signal is identified as having a higher priority than the other sounding reference signals based at least in part on the second set of frequency resources including frequency resources within one or more different bandwidth parts or within one or more component carriers, or frequency resources that are not part of the first set of frequency resources.

17. The method of claim 15, wherein: The higher priority is associated with a higher priority with respect to transmission power reduction due to carrier aggregation power scaling priority.

18. The method of claim 1, wherein: The indication of the association between the first set of frequency resources and the second set of frequency resources is received together with a configuration identifying the first set of frequency resources for transmitting the sounding reference signal.

19. A method for wireless communication at a base station, comprising: receiving an indication of UE capabilities associated with a gap between a first set of frequency resources and a second set of frequency resources; transmitting a configuration to a user equipment (UE) based on the UE capabilities, the configuration identifying the first set of frequency resources for the UE to use to transmit a sounding reference signal to be used for at least downlink channel state information acquisition; transmitting an indication of an association between the first set of frequency resources and the second set of frequency resources; receiving the sounding reference signal from the UE on the first set of frequency resources based at least in part on the association; as well as Channel state information for at least the second set of frequency resources is determined based at least in part on the received sounding reference signal.

20. The method of claim 19, further comprising: Transmitting indicates a configuration of resources for a channel state information reference signal, wherein the indication regarding the association is based at least in part on the configuration for the channel state information reference signal.

21. The method of claim 19, further comprising: A configuration for one or more channel state information reference signals associated with the second set of frequency resources is transmitted jointly with the configuration identifying the first set of frequency resources, wherein the association between the first set of frequency resources and the second set of frequency resources is implicitly indicated at least in part based on the jointly transmitted configuration.

22. The method of claim 21, further comprising: A medium access control control element for activating a semi-persistent opportunity for the first set of frequency resources and the second set of frequency resources is transmitted.

23. The method of claim 19, wherein: The first set of frequency resources and the second set of frequency resources include different bandwidths, bandwidth parts, component carriers, radio frequency spectrum bands or any combination thereof.

24. The method of claim 19, wherein: The association indicates that the first set of frequency resources and the second set of frequency resources are in the same bandwidth part, different bandwidth parts, different component carriers of the same radio frequency spectrum band, or different component carriers of different radio frequency spectrum bands.

25. The method of claim 19, wherein: The first set of frequency resources includes a first uplink component carrier and a second downlink component carrier, and wherein the sounding reference signal is received on the first uplink component carrier and the second downlink component carrier based at least in part on a sounding reference signal carrier switching.

26. The method of claim 19, wherein: The indication of the association between the first set of frequency resources and the second set of frequency resources is received together with a configuration identifying the first set of frequency resources for transmitting the sounding reference signal.

27. An apparatus for wireless communication at a user equipment (UE), comprising: processor; a memory coupled to the processor; as well as instructions stored in the memory and executable by the processor to cause the apparatus to: transmitting an indication of UE capabilities associated with a gap between a first set of frequency resources and a second set of frequency resources; receiving a configuration, the configuration identifying the first set of frequency resources for transmitting a sounding reference signal to be used at least for downlink channel state information acquisition; receiving an indication of an association between the configuration for the sounding reference signal and the second set of frequency resources; determining, based at least in part on the association, values ​​of one or more sounding reference signal transmission parameters for the first set of frequency resources; as well as Based at least in part on the determined one or more values, the sounding reference signal is transmitted on the first set of frequency resources.

28. An apparatus for wireless communication at a base station, comprising: processor; a memory coupled to the processor; as well as instructions stored in the memory and executable by the processor to cause the apparatus to: receiving an indication of UE capabilities associated with a gap between a first set of frequency resources and a second set of frequency resources; transmitting a configuration to a user equipment (UE) based on the UE capabilities, the configuration identifying the first set of frequency resources for the UE to use to transmit a sounding reference signal to be used for at least downlink channel state information acquisition; transmitting an indication of an association between the first set of frequency resources and the second set of frequency resources; receiving the sounding reference signal from the UE on the first set of frequency resources based at least in part on the association; as well as Channel state information for at least the second set of frequency resources is determined based at least in part on the received sounding reference signal.

29. An apparatus for wireless communication at a user equipment (UE), comprising: means for transmitting an indication of UE capabilities associated with a gap between a first set of frequency resources and a second set of frequency resources; means for receiving a configuration, the configuration identifying the first set of frequency resources for transmitting a sounding reference signal to be used for at least downlink channel state information acquisition; means for receiving an indication of an association between the configuration for the sounding reference signal and the second set of frequency resources; means for determining values ​​of one or more sounding reference signal transmission parameters for the first set of frequency resources based at least in part on the association; as well as means for transmitting the sounding reference signal on the first set of frequency resources based at least in part on the determined one or more values.

30. An apparatus for wireless communication at a base station, comprising: means for receiving an indication of UE capabilities associated with a gap between a first set of frequency resources and a second set of frequency resources; means for transmitting a configuration to a user equipment (UE) based on the UE capabilities, the configuration identifying the first set of frequency resources for the UE to use to transmit a sounding reference signal to be used for at least downlink channel state information acquisition; means for transmitting an indication of an association between the first set of frequency resources and the second set of frequency resources; means for receiving the sounding reference signal from the UE on the first set of frequency resources based at least in part on the association; as well as Means for determining channel state information for at least the second set of frequency resources based at least in part on the received sounding reference signal.

31. A non-transitory computer-readable medium storing code for wireless communication at a user equipment (UE), the code comprising instructions executable by a processor to: transmitting an indication of UE capabilities associated with a gap between a first set of frequency resources and a second set of frequency resources; receiving a configuration, the configuration identifying the first set of frequency resources for transmitting a sounding reference signal to be used at least for downlink channel state information acquisition; receiving an indication of an association between the configuration for the sounding reference signal and the second set of frequency resources; determining, based at least in part on the association, values ​​of one or more sounding reference signal transmission parameters for the first set of frequency resources; as well as Based at least in part on the determined one or more values, the sounding reference signal is transmitted on the first set of frequency resources.

32. A non-transitory computer-readable medium storing code for wireless communication at a base station, the code comprising instructions executable by a processor to: receiving an indication of UE capabilities associated with a gap between a first set of frequency resources and a second set of frequency resources; transmitting a configuration to a user equipment (UE) based on the UE capabilities, the configuration identifying the first set of frequency resources for the UE to use to transmit a sounding reference signal to be used for at least downlink channel state information acquisition; transmitting an indication of an association between the first set of frequency resources and the second set of frequency resources; receiving the sounding reference signal from the UE on the first set of frequency resources based at least in part on the association; as well as Channel state information for at least the second set of frequency resources is determined based at least in part on the received sounding reference signal.

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