Subband-specific sounding reference signal resource indicator indication for non-codebook based frequency selective uplink precoding

Abstract

Various aspects of the present disclosure generally relate to wireless communications. In some aspects, a user device may receive a subband-specific SRS resource indicator that identifies a subset of SRS resources in a sounding reference signal (SRS) resource set, the SRS resource subset being associated with precoding a PUSCH communication to be sent in a physical uplink shared channel (PUSCH) resource. The user device may precode the PUSCH communication based at least in part on the subband-specific SRS resource indicator. The user device may send the PUSCH communication after precoding the PUSCH communication based at least in part on the subband-specific SRS resource indicator. Numerous other aspects are provided.

Description

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This patent application claims priority to Patent Cooperation Treaty (PCT) Application No. PCT / CN2019 / 099945, entitled "SUB-BAND SPECIFICSOUNDING REFERENCE SIGNAL RESOURCE INDICATOR INDICATION FOR NON-CODEBOOKBASED FREQUENCY-SELECTIVE UPLINK PRECODING", filed on August 9, 2019, which has been assigned to the assignee of this application. The disclosure of the prior application is considered a part of this patent application and is incorporated by reference into this patent application. Technical Field

[0003]

[0006] Generally speaking, aspects of the present disclosure relate to wireless communications and to techniques and apparatus for subband-specific sounding reference signal (SRS) resource indicator indication for non-codebook (NCB) based frequency selective uplink precoding. Background Art

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

[0005] A wireless communication network may include multiple base stations (BSs) that may support communications for multiple user equipments (UEs). User equipments (UEs) may communicate with base stations (BSs) via downlinks and uplinks. A downlink (or forward link) refers to a communication link from a BS to a UE, and an uplink (or reverse link) refers to a communication link from a UE to a BS. As will be described in more detail herein, a BS may be referred to as a Node B, gNB, access point (AP), radio head, transmit receive point (TRP), new radio (NR) BS, 5G Node B, etc.

[0006] The above multiple access technologies have been adopted by various telecommunication standards to provide a common protocol that enables different user equipment to communicate at the municipal, national, regional and even global levels. New Radio (NR) (which may also be referred to as 5G) is a set of enhancements to the LTE mobile standard promulgated by the Third Generation Partnership Project (3GPP). NR is designed to be better integrated with other open standards by improving spectrum efficiency, reducing costs, improving services, utilizing new spectrum, and using orthogonal frequency division multiplexing (OFDM) (CP-OFDM) with cyclic prefix (CP) on the downlink (DL), using CP-OFDM or SC-FDM (e.g., also referred to as discrete Fourier transform spread OFDM (DFT-s-OFDM)) on the uplink (UL), and supporting beamforming, multiple input multiple output (MIMO) antenna technology and carrier aggregation to better support mobile broadband network access. However, as the requirements for mobile broadband access continue to increase, there is a need for further improvements in LTE and NR technologies. Better, these improvements should be applicable to other multiple access technologies and telecommunication standards that adopt these technologies.

[0007] In some wireless communication systems, frequency selective uplink precoding based on non-codebook (NCB) can be supported. Frequency selective uplink precoding based on NCB allows UE to use different NCB-based precoders in different allocated subbands of a given frequency band. Here, the UE and the base station should reach an agreement on the method used by the UE to select the NCB-based precoder across the allocated frequency resources. In some cases, frequency selective uplink precoding based on NCB can be performed as follows: an SRS resource can be composed of multiple SRS frequency hopping, where different hopping can be based on different precoders, and the base station indicates a broadband SRI. Here, the UE can implement frequency selective precoding based on the indicated broadband SRI. One disadvantage of this technology is that each frequency subband uses the same SRS resource. Therefore, the base station may not be able to optimize the subband-specific precoder, because the subband-specific precoder is determined by the UE when sending the SRS hopping. In other words, the current implementation of frequency selective uplink precoding based on NCB does not provide control of the frequency selective precoder, which may cause significant UE-to-UE interference. Summary of the invention

[0008] In some aspects, a method of wireless communication performed by a user equipment may include: determining whether the bandwidth of a sounding reference signal (SRS) resource is less than the bandwidth of a physical uplink shared channel (PUSCH) resource or greater than or equal to the bandwidth of the PUSCH resource. The method may include: precoding a PUSCH communication to be sent in the PUSCH resource using any of the following: based on determining that the bandwidth of the SRS resource is less than the bandwidth of the PUSCH resource, using a wideband precoder; or based on determining that the bandwidth of the SRS resource is greater than or equal to the bandwidth of the PUSCH resource, using a subband-specific precoder. The method may include: sending the precoded PUSCH communication.

[0009] In some aspects, a method of wireless communication performed by a user equipment may include: using a first precoder to precode a first portion of a PUSCH communication to be sent in a portion of a PUSCH resource that overlaps a bandwidth of an SRS resource. The method may include: using a second precoder to precode a second portion of the PUSCH communication to be sent in a portion of the PUSCH resource that does not overlap the bandwidth of the SRS resource. The method may include: sending the precoded PUSCH communication.

[0010] In some aspects, a method of wireless communication performed by a user equipment may include: receiving a subband-specific SRS resource indicator identifying a subset of SRS resources in a set of SRS resources, wherein the SRS resource subset is associated with precoding of a PUSCH communication to be transmitted in a PUSCH resource. The method may include: precoding the PUSCH communication based at least in part on the subband-specific SRS resource indicator. The method may include: sending the precoded PUSCH communication.

[0011] In some aspects, a user equipment for wireless communication may include a memory and one or more processors operatively coupled to the memory. The memory and the one or more processors may be configured to determine whether the bandwidth of an SRS resource is less than the bandwidth of a PUSCH resource or greater than or equal to the bandwidth of the PUSCH resource. The memory and the one or more processors may be configured to precode the PUSCH communication to be sent in the PUSCH resource using any of the following methods: based on determining that the bandwidth of the SRS resource is less than the bandwidth of the PUSCH resource, using a wideband precoder; or based on determining that the bandwidth of the SRS resource is greater than or equal to the bandwidth of the PUSCH resource, using a subband-specific precoder. The memory and the one or more processors may be configured to send the precoded PUSCH communication.

[0012] In some aspects, a user device for wireless communication may include a memory and one or more processors operatively coupled to the memory. The memory and the one or more processors may be configured to use a first precoder to precode a first portion of a PUSCH communication to be sent in a portion of a PUSCH resource that overlaps with a bandwidth of an SRS resource. The memory and the one or more processors may be configured to use a second precoder to precode a second portion of the PUSCH communication to be sent in a portion of the PUSCH resource that does not overlap with the bandwidth of the SRS resource. The memory and the one or more processors may be configured to send the precoded PUSCH communication.

[0013] In some aspects, a user equipment for wireless communication may include a memory and one or more processors operatively coupled to the memory. The memory and the one or more processors may be configured to: receive a subband-specific SRS resource indicator identifying a subset of SRS resources in an SRS resource set, the SRS resource subset being associated with precoding a PUSCH communication to be sent in a PUSCH resource. The memory and the one or more processors may be configured to: precode the PUSCH communication based at least in part on the subband-specific SRS resource indicator. The memory and the one or more processors may be configured to: send the precoded PUSCH communication.

[0014] In some aspects, a non-transitory computer-readable medium may store one or more instructions for wireless communication. When the one or more instructions are executed by one or more processors of a user device, the one or more processors may determine whether the bandwidth of the SRS resource is less than the bandwidth of the PUSCH resource or greater than or equal to the bandwidth of the PUSCH resource. When the one or more instructions are executed by one or more processors of a user device, the one or more processors may use any of the following methods to precode the PUSCH communication to be sent in the PUSCH resource: based on determining that the bandwidth of the SRS resource is less than the bandwidth of the PUSCH resource, a wideband precoder is used; or based on determining that the bandwidth of the SRS resource is greater than or equal to the bandwidth of the PUSCH resource, a subband-specific precoder is used. When the one or more instructions are executed by one or more processors of a user device, the one or more processors may send the precoded PUSCH communication.

[0015] In some aspects, a non-transitory computer-readable medium may store one or more instructions for wireless communication. When the one or more instructions are executed by one or more processors of a user device, the one or more processors may use a first precoder to precode a first portion of a PUSCH communication to be sent in a portion of a PUSCH resource that overlaps with a bandwidth of an SRS resource. When the one or more instructions are executed by one or more processors of a user device, the one or more processors may use a second precoder to precode a second portion of the PUSCH communication to be sent in a portion of the PUSCH resource that does not overlap with the bandwidth of the SRS resource. When the one or more instructions are executed by one or more processors of a user device, the one or more processors may send the precoded PUSCH communication.

[0016] In some aspects, a non-transitory computer-readable medium may store one or more instructions for wireless communication. The one or more instructions, when executed by one or more processors of a user device, may cause the one or more processors to receive a subband-specific SRS resource indicator that identifies a subset of SRS resources in an SRS resource set, the SRS resource subset being associated with precoding a PUSCH communication to be sent in a PUSCH resource. The one or more instructions, when executed by one or more processors of a user device, may cause the one or more processors to precode the PUSCH communication based at least in part on the subband-specific SRS resource indicator. The one or more instructions, when executed by one or more processors of a user device, may cause the one or more processors to send the precoded PUSCH communication.

[0017] In some aspects, an apparatus for wireless communication may include: a unit for determining whether a bandwidth of an SRS resource is less than a bandwidth of a PUSCH resource or greater than or equal to the bandwidth of the PUSCH resource. The apparatus may include: a unit for precoding a PUSCH communication to be sent in the PUSCH resource using either: a wideband precoder based on a determination that the bandwidth of the SRS resource is less than the bandwidth of the PUSCH resource; or a subband-specific precoder based on a determination that the bandwidth of the SRS resource is greater than or equal to the bandwidth of the PUSCH resource. The apparatus may include: a unit for sending the precoded PUSCH communication.

[0018] In some aspects, an apparatus for wireless communication may include: means for precoding a first portion of a PUSCH communication to be sent in a portion of a PUSCH resource that overlaps a bandwidth of an SRS resource using a first precoder. The apparatus may include: means for precoding a second portion of the PUSCH communication to be sent in a portion of the PUSCH resource that does not overlap the bandwidth of the SRS resource using a second precoder. The apparatus may include: means for sending the precoded PUSCH communication.

[0019] In some aspects, an apparatus for wireless communication may include: means for receiving a subband-specific SRS resource indicator identifying a subset of SRS resources in a set of SRS resources, the SRS resource subset associated with precoding a PUSCH communication to be sent in a PUSCH resource. The apparatus may include: means for precoding the PUSCH communication based at least in part on the subband-specific SRS resource indicator. The apparatus may include: means for sending the precoded PUSCH communication.

[0020] In some aspects, a method of wireless communication performed by a base station may include determining whether a bandwidth of an SRS resource is less than a bandwidth of a PUSCH resource or greater than or equal to the bandwidth of the PUSCH resource. The method may include receiving a PUSCH communication sent in the PUSCH resource using any of the following: based on determining that the bandwidth of the SRS resource is less than the bandwidth of the PUSCH resource, using a wideband precoder; or based on determining that the bandwidth of the SRS resource is greater than or equal to the bandwidth of the PUSCH resource, using a subband-specific precoder.

[0021] In some aspects, a method of wireless communication performed by a base station may include: using a first precoder to receive a first portion of a PUSCH communication sent in a portion of a PUSCH resource that overlaps with a bandwidth of an SRS resource, wherein the first portion of the PUSCH communication is precoded using the first precoder. The method may include: using a second precoder to receive a second portion of the PUSCH communication sent in a portion of the PUSCH resource that does not overlap with the bandwidth of the SRS resource, wherein the second portion of the PUSCH communication is precoded using the second precoder.

[0022] In some aspects, a method of wireless communication performed by a base station may include: transmitting a subband-specific SRS resource indicator identifying a subset of SRS resources in a set of SRS resources, the SRS resource subset being associated with precoding of PUSCH communications to be sent in PUSCH resources. The method may include: receiving the PUSCH communications after transmitting the subband-specific SRS resource indicator, wherein the PUSCH communications are precoded based at least in part on the subband-specific SRS resource indicator.

[0023] In some aspects, a base station for wireless communication may include a memory and one or more processors operatively coupled to the memory. The memory and the one or more processors may be configured to determine whether a bandwidth of an SRS resource is less than a bandwidth of a PUSCH resource or greater than or equal to the bandwidth of the PUSCH resource. The memory and the one or more processors may be configured to receive a PUSCH communication sent in the PUSCH resource using any of the following methods: based on determining that the bandwidth of the SRS resource is less than the bandwidth of the PUSCH resource, using a wideband precoder; or based on determining that the bandwidth of the SRS resource is greater than or equal to the bandwidth of the PUSCH resource, using a subband-specific precoder.

[0024] In some aspects, a base station for wireless communication may include a memory and one or more processors operatively coupled to the memory. The memory and the one or more processors may be configured to receive, using a first precoder, a first portion of a PUSCH communication sent in a portion of a PUSCH resource that overlaps a bandwidth of an SRS resource, wherein the first portion of the PUSCH communication is precoded using the first precoder. The memory and the one or more processors may be configured to receive, using a second precoder, a second portion of the PUSCH communication sent in a portion of the PUSCH resource that does not overlap the bandwidth of the SRS resource, wherein the second portion of the PUSCH communication is precoded using the second precoder.

[0025] In some aspects, a base station for wireless communication may include a memory and one or more processors operatively coupled to the memory. The memory and the one or more processors may be configured to: send a subband-specific SRS resource indicator identifying a subset of SRS resources in a set of SRS resources, the SRS resource subset being associated with a precoding of a PUSCH communication to be sent in a PUSCH resource. The memory and the one or more processors may be configured to receive the PUSCH communication after sending the subband-specific SRS resource indicator, wherein the PUSCH communication is precoded based at least in part on the subband-specific SRS resource indicator.

[0026] In some aspects, a non-transitory computer-readable medium may store one or more instructions for wireless communication. The one or more instructions, when executed by one or more processors of a base station, may cause the one or more processors to determine whether the bandwidth of an SRS resource is less than the bandwidth of a PUSCH resource or greater than or equal to the bandwidth of the PUSCH resource. The one or more instructions, when executed by one or more processors of a base station, may cause the one or more processors to receive a PUSCH communication sent in the PUSCH resource using any of the following methods: based on determining that the bandwidth of the SRS resource is less than the bandwidth of the PUSCH resource, using a wideband precoder; or based on determining that the bandwidth of the SRS resource is greater than or equal to the bandwidth of the PUSCH resource, using a subband-specific precoder.

[0027] In some aspects, a non-transitory computer-readable medium may store one or more instructions for wireless communication. The one or more instructions, when executed by one or more processors of a base station, may cause the one or more processors to use a first precoder to receive a first portion of a PUSCH communication sent in a portion of a PUSCH resource that overlaps with a bandwidth of an SRS resource, wherein the first portion of the PUSCH communication is precoded using the first precoder. The one or more instructions, when executed by one or more processors of a base station, may cause the one or more processors to use a second precoder to receive a second portion of the PUSCH communication sent in a portion of the PUSCH resource that does not overlap with the bandwidth of the SRS resource, wherein the second portion of the PUSCH communication is precoded using the second precoder.

[0028] In some aspects, a non-transitory computer-readable medium may store one or more instructions for wireless communication. The one or more instructions, when executed by one or more processors of a base station, may cause the one or more processors to send a subband-specific SRS resource indicator that identifies a subset of SRS resources in a sounding reference signal (SRS) resource set, the SRS resource subset being associated with precoding of a PUSCH communication to be sent in a PUSCH resource. The one or more instructions, when executed by one or more processors of the base station, may cause the one or more processors to receive the PUSCH communication after sending the subband-specific SRS resource indicator, wherein the PUSCH communication is precoded based at least in part on the subband-specific SRS resource indicator.

[0029] In some aspects, an apparatus for wireless communication may include: means for determining whether a bandwidth of an SRS resource is less than a bandwidth of a PUSCH resource or greater than or equal to the bandwidth of the PUSCH resource. The apparatus may include: means for receiving a PUSCH communication sent in the PUSCH resource using either: based on determining that the bandwidth of the SRS resource is less than the bandwidth of the PUSCH resource, using a wideband precoder; or based on determining that the bandwidth of the SRS resource is greater than or equal to the bandwidth of the PUSCH resource, using a subband-specific precoder.

[0030] In some aspects, an apparatus for wireless communication may include: means for receiving, using a first precoder, a first portion of a PUSCH communication sent in a portion of a PUSCH resource that overlaps a bandwidth of an SRS resource, wherein the first portion of the PUSCH communication is precoded using the first precoder. The apparatus may include: means for receiving, using a second precoder, a second portion of the PUSCH communication sent in a portion of the PUSCH resource that does not overlap the bandwidth of the SRS resource, wherein the second portion of the PUSCH communication is precoded using the second precoder.

[0031] In some aspects, an apparatus for wireless communication may include: means for transmitting a subband-specific sounding reference signal (SRS) resource indicator identifying a subset of SRS resources in a set of SRS resources, the SRS resource subset being associated with precoding a PUSCH communication to be sent in a PUSCH resource. The apparatus may include: means for receiving the PUSCH communication after transmitting the subband-specific SRS resource indicator, wherein the PUSCH communication is precoded based at least in part on the subband-specific SRS resource indicator.

[0032] Aspects generally include methods, apparatuses, systems, computer program products, non-transitory computer-readable media, user equipment, base stations, wireless communication devices, or processing systems as generally described herein with reference to and as illustrated by the accompanying drawings and description.

[0033] The features and technical advantages of the examples have been outlined quite extensively above in accordance with the present disclosure so that the specific embodiments that follow can be better understood. Additional features and advantages will be described below. For the same purpose of achieving the present disclosure, the disclosed concepts and specific examples may be readily utilized as a basis for modifying or designing other structures. Such equivalent constructions do not depart from the scope of the appended claims. When considered in conjunction with the accompanying drawings, the characteristics of the concepts disclosed herein (both their organization and method of operation) together with the associated advantages will be better understood from the following description. Each of the figures in the accompanying drawings is provided for the purpose of illustration and description, and is not intended to limit the scope of the claims. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] In order to understand the above-mentioned features of the present disclosure in detail, the contents briefly summarized above may be described in more detail with reference to various aspects, some of which are shown in the accompanying drawings. However, it should be noted that the accompanying drawings only illustrate certain typical aspects of the present disclosure and are therefore not to be considered as limiting the scope thereof, as the specification may admit other equally effective aspects. The same reference numerals in different drawings may identify the same or similar elements.

[0035] Figure 1 is a block diagram conceptually illustrating an example of a wireless communication network in accordance with various aspects of the present disclosure.

[0036] Figure 2 is a block diagram conceptually illustrating an example of a base station communicating with a UE in a wireless communication network according to various aspects of the present disclosure.

[0037] Figure 3 , 4A -4C, 5, 6A-6G, 7A and Figure 7B is a schematic diagram associated with subband-specific SRS resource indicator indication for NCB-based frequency selective uplink precoding according to various aspects of the present disclosure.

[0038] Figure 8 is a schematic diagram illustrating an example process, for example, performed by a user device, according to various aspects of the present disclosure.

[0039] Fig. 9 is a schematic diagram illustrating an example process, for example, performed by a user device, according to various aspects of the present disclosure.

[0040] Fig.10 is a schematic diagram illustrating an example process, for example, performed by a user device, according to various aspects of the present disclosure.

[0041] Fig.11 is a diagram illustrating example processes performed, for example, by a base station according to various aspects of the present disclosure.

[0042] Fig.12 is a schematic diagram illustrating an example process, for example, performed by a user device, according to various aspects of the present disclosure.

[0043] Fig.13 is a schematic diagram illustrating an example process, for example, performed by a user device, according to various aspects of the present disclosure.

[0044] Fig.14 and Fig.15 is a block diagram of an example apparatus for wireless communications in accordance with various aspects of the present disclosure. DETAILED DESCRIPTION

[0045] The various aspects of the present disclosure are described more fully below with reference to the accompanying drawings. However, the present disclosure can be embodied in a variety of different forms, and should not be interpreted as being limited to any specific structure or function given throughout the present disclosure. On the contrary, these aspects are provided so that the present disclosure will become thorough and complete, and the scope of the present disclosure will be fully conveyed to those skilled in the art. Based on the teachings herein, it should be appreciated by those skilled in the art that the scope of the present disclosure is intended to cover any aspect of the disclosure disclosed herein, whether it is implemented independently or in combination with any other aspect of the present disclosure. For example, a device or method can be implemented using any number of aspects set forth herein. In addition, the scope of the present disclosure is intended to cover such a device or method implemented using other structures, functions, or structures and functions of various aspects of the present disclosure set forth herein, or structures and functions of various aspects of the present disclosure set forth herein that are different from those set forth herein. It should be understood that any aspect of the disclosure disclosed herein can be embodied by one or more elements of the claims.

[0046] Several aspects of telecommunication systems will now be presented with reference to various devices and techniques. These devices and techniques will be described in the following detailed description and illustrated in the accompanying drawings by various blocks, modules, components, circuits, steps, processes, algorithms, etc. (collectively referred to as "elements"). These elements may be implemented using hardware, software, or any combination thereof. Whether these elements are implemented as hardware or software depends on the specific application and the design constraints imposed on the overall system.

[0047] Various aspects generally relate to SRS resource indicator (SRI) indications. Some aspects more specifically relate to subband-specific SRI indications for frequency selective uplink precoding based on NCB. In general, NCB-based precoding provides the UE with the flexibility to select a precoder that is well suited for the transmission channel. Using NCB-based uplink precoding reduces downlink signaling because the base station does not need to signal a precoding matrix indicator (PMI) or precoder to the UE. NCB-based frequency selective uplink precoding allows the UE to use different NCB-based precoders in different allocated subbands of a given frequency band, which means that the UE has the flexibility to select a precoder that is well suited for transmission in a given subband. In order to support frequency selective uplink precoding, the UE and the base station should agree on the method used by the UE to select an NCB-based precoder across allocated frequency resources.

[0048] In one example aspect for implementing subband-specific SRI indication for frequency selective precoding based on NCB, the UE may precode PUSCH communications to be sent in physical uplink shared channel (PUSCH) resources using a wideband precoder (e.g., based on determining that a bandwidth of SRS resources is less than a bandwidth of PUSCH resources) or a subband-specific precoder (e.g., based on determining that a bandwidth of SRS resources is greater than or equal to a bandwidth of PUSCH resources). In another example aspect for implementing subband-specific SRI indication for frequency selective precoding based on NCB, the UE may precode a first portion of PUSCH communications to be sent in a portion of PUSCH resources that overlaps with a bandwidth of SRS resources using a first precoder, and may precode a second portion of PUSCH communications to be sent in a portion of PUSCH resources that does not overlap with a bandwidth of SRS resources using a second precoder. In another example aspect for implementing subband-specific SRI indication for NCB-based frequency selective precoding, a UE may precode PUSCH communications to be sent in PUSCH resources based at least in part on a subband-specific SRS resource indicator that identifies a subset of SRS resources associated with precoding the PUSCH communications.

[0049] Certain aspects of the subject matter described in this disclosure may be implemented to achieve one or more of the following potential advantages. In some examples, the described techniques may be used to improve control of a frequency selective precoder. In some aspects, the improved control of the frequency selective precoder enables reduced inter-UE interference when implementing NCB-based frequency selective precoding.

[0050] Figure 1 1 is a schematic diagram showing a wireless network 100 in which various aspects of the present disclosure may be implemented. The wireless network 100 may be an LTE network or some other wireless network (such as a 5G or NR network). The wireless network 100 may include a plurality of BSs 110 (shown as BS 110a, BS 110b, BS 110c, and BS 110d) and other network entities. A BS is an entity that communicates with a user equipment (UE), and a BS may also be referred to as a base station, NR BS, Node B, gNB, 5G Node B (NB), access point, transmit receive point (TRP), and the like. Each BS may provide communication coverage for a particular geographic area. In 3GPP, the term "cell" may refer to a coverage area of ​​a BS or a BS subsystem serving the coverage area, depending on the context in which the term is used.

[0051] A BS may provide communication coverage for a macro cell, a pico cell, a femto cell, or another type of cell. A macro cell may cover a relatively large geographic area (e.g., several kilometers in radius) and may allow unrestricted access by UEs with service subscription. A pico cell may cover a relatively small geographic area and may allow unrestricted access by UEs with service subscription. A femto cell may cover a relatively small geographic area (e.g., a residence) and may allow restricted access by UEs associated with the femto cell (e.g., UEs in a closed subscriber group (CSG)). A BS for a macro cell may be referred to as a macro BS. A BS for a pico cell may be referred to as a pico BS. A BS for a femto cell may be referred to as a femto BS or a home BS. In Figure 1 In the example shown, BS 110a may be a macro BS for macro cell 102a, BS 110b may be a pico BS for pico cell 102b, and BS 110c may be a femto BS for femto cell 102c. A BS may support one or more (e.g., three) cells. The terms "eNB", "base station", "NR BS", "gNB", "TRP", "AP", "Node B", "5G NB", and "cell" may be used interchangeably herein.

[0052] In some aspects, the cells may not necessarily be stationary, and the geographic area of ​​the cells may move depending on the location of the mobile BS. In some aspects, the BSs may be interconnected to each other or to one or more other BSs or network nodes (not shown) in the wireless network 100 through various types of backhaul interfaces (such as direct physical connections, virtual networks, and other examples) using any suitable transport network.

[0053] The wireless network 100 may also include a relay station. A relay station is an entity that can receive transmissions of data from an upstream station (e.g., a BS or a UE) and send transmissions of the data to a downstream station (e.g., a UE or a BS). A relay station may also be a UE that can relay transmissions of other UEs. Figure 1 In the example shown, a relay station 110d may communicate with a macro BS 110a and a UE 120d to facilitate communication between the BS 110a and the UE 120d. A relay station may also be referred to as a relay BS, a relay base station, a relay, or the like.

[0054] The wireless network 100 may be a heterogeneous network including different types of BSs (e.g., macro BSs, pico BSs, femto BSs, relay BSs, etc.). These different types of BSs may have different transmit power levels, different coverage areas, and different effects on interference in the wireless network 100. For example, a macro BS may have a high transmit power level (e.g., 5 watts to 40 watts), while a pico BS, a femto BS, and a relay BS may have a lower transmit power level (e.g., 0.1 watts to 2 watts).

[0055] The network controller 130 may be coupled to a set of BSs and may provide coordination and control for these BSs. The network controller 130 may communicate with the BSs via a backhaul. The BSs may also communicate with each other indirectly, for example, directly or via a wireless backhaul or a wired backhaul.

[0056] UE 120 (e.g., UE 120a, UE 120b, UE 120c, UE 120d, UE 120e) can be dispersed throughout the wireless network 100, and each UE can be stationary or mobile. UE can also be referred to as an access terminal, terminal, mobile station, subscriber unit, station, etc. UE can be a cellular phone (e.g., a smart phone), a personal digital assistant (PDA), a wireless modem, a wireless communication device, a handheld device, a laptop computer, a cordless phone, a wireless local loop (WLL) station, a tablet device, a camera, a gaming device, a netbook, a smartbook, an ultrabook, a medical device or equipment, a biosensor / device, a wearable device (smart watch, smart clothing, smart glasses, smart wristband, smart jewelry (e.g., smart ring, smart bracelet)), an entertainment device (e.g., a music or video device, or a satellite radio device), a vehicle component or sensor, a smart meter / sensor, an industrial manufacturing device, a global positioning system device, or any other suitable device configured to communicate via a wireless medium or a wired medium.

[0057] Some UEs may be considered to be machine type communication (MTC) UEs or evolved or enhanced machine type communication (eMTC) UEs. For example, MTC UEs and eMTC UEs include robots, drones, remote devices, sensors, meters, monitors, location tags, etc. that can communicate with a base station, another device (e.g., a remote device), or some other entity. For example, a wireless node may provide a connection to a network (e.g., a wide area network such as the Internet or a cellular network) or provide a connection to a network (e.g., a wide area network such as the Internet or a cellular network) via a wired communication link or a wireless communication link. Some UEs may be considered to be Internet of Things (IoT) devices, and / or may be implemented as NB-IoT (narrowband Internet of Things) devices. Some UEs may be considered to be user premises equipment (CPE). UE 120 may be included in a housing that houses components of UE 120 (such as a processor component, a memory component, etc.).

[0058] Generally, any number of wireless networks can be deployed in a given geographic area. Each wireless network can support a specific RAT and can operate on one or more frequencies. RAT can also be referred to as radio technology, air interface, etc. Frequency can also be referred to as carrier, frequency channel, etc. Each frequency can support a single RAT in a given geographic area to avoid interference between wireless networks of different RATs. In some cases, NR or 5G RAT networks can be deployed.

[0059] In some aspects, (e.g., without using base station 110 as an intermediary to communicate with each other) two or more UEs 120 (e.g., shown as UE 120a and UE 120e) can communicate directly using one or more sidelink channels. For example, UE 120 can communicate using peer-to-peer (P2P) communication, device-to-device (D2D) communication, vehicle-to-everything (V2X) protocol (e.g., which may include vehicle-to-vehicle (V2V) protocol, vehicle-to-infrastructure (V2I) protocol, etc.), mesh network, etc. In this case, UE 120 can perform scheduling operations, resource selection operations, and / or other operations described elsewhere herein performed by base station 110.

[0060] Figure 2 A block diagram 200 shows a design 200 of a base station 110 and a UE 120, where the base station 110 and the UE 120 may be Figure 1 A base station in the base station and Figure 1 Base station 110 may be equipped with T antennas 234a through 234t, and UE 120 may be equipped with R antennas 252a through 252r, where in general T ≥ 1 and R ≥ 1.

[0061] At the base station 110, the transmit processor 220 may receive data for one or more UEs from the data source 212, select one or more modulation and coding schemes (MCS) for the UE based at least in part on a channel quality indicator (CQI) received from the UE, process (e.g., encode and modulate) the data for each UE based at least in part on the MCS selected for the UE, and provide data symbols for all UEs. The transmit processor 220 may also process system information (e.g., for semi-static resource partitioning information (SRPI), etc.) and control information (e.g., CQI requests, grants, upper layer signaling, etc.), and provide overhead symbols and control symbols. The transmit processor 220 may also generate reference symbols for reference signals (e.g., cell-specific reference signals (CRS)) and synchronization signals (e.g., primary synchronization signals (PSS) and secondary synchronization signals (SSS)). The transmit (TX) multiple-input multiple-output (MIMO) processor 230 may perform spatial processing (e.g., precoding) on ​​data symbols, control symbols, overhead symbols, or reference symbols (if applicable), and may provide T output symbol streams to T modulators (MOD) 232a to 232t. Each modulator 232 may process a respective output symbol stream (e.g., for OFDM, etc.) to obtain an output sample stream. Each modulator 232 may further process (e.g., convert to an analog signal, amplify, filter, and up-convert) the output sample stream to obtain a downlink signal. The T downlink signals from modulators 232a to 232t may be transmitted via T antennas 234a to 234t, respectively. According to various aspects described in detail below, position coding may be used to generate synchronization signals to transmit additional information.

[0062] At UE 120, antennas 252a to 252r can receive downlink signals from base station 110 or other base stations and can provide received signals to demodulators (DEMOD) 254a to 254r, respectively. Each demodulator 254 can condition (e.g., filter, amplify, down-convert and digitize) the received signal to obtain input samples. Each demodulator 254 can further process the input samples (e.g., for OFDM, etc.) to obtain received symbols. MIMO detector 256 can obtain received symbols from all R demodulators 254a to 254r, perform MIMO detection on the received symbols (if applicable), and provide detected symbols. Receive processor 258 can process (e.g., demodulate and decode) the detected symbols, provide decoded data for UE 120 to data sink 260, and provide decoded control information and system information to controller / processor 280. The channel processor may determine reference signal received power (RSRP), received signal strength indicator (RSSI), reference signal received quality (RSRQ), channel quality indicator (CQI), etc. In some aspects, one or more components of UE 120 may be included in a housing.

[0063] On the uplink, at the UE 120, a transmit processor 264 may receive and process data from a data source 262 and control information (e.g., for reports including RSRP, RSSI, RSRQ, CQI, etc.) from a controller / processor 280. The transmit processor 264 may also generate reference symbols for one or more reference signals. The symbols from the transmit processor 264 may be precoded by a TX MIMO processor 266 (if applicable), further processed by modulators 254a through 254r (e.g., for DFT-s-OFDM, CP-OFDM, etc.), and transmitted to the base station 110. At the base station 110, uplink signals from the UE 120 and other UEs may be received by the antenna 234, processed by the demodulator 232, detected by the MIMO detector 236 (if applicable), and further processed by the receive processor 238 to obtain decoded data and control information sent by the UE 120. The receive processor 238 may provide decoded data to a data sink 239 and decoded control information to a controller / processor 240. The base station 110 may include a communication unit 244 and transmit to the network controller 130 via the communication unit 244. The network controller 130 may include a communication unit 294, a controller / processor 290, and a memory 292.

[0064] Figure 2The controller / processor 240 of the base station 110, the controller / processor 280 of the UE 120, or any other component may perform one or more techniques associated with subband-specific sounding reference signal (SRS) resource indicator indication for non-codebook (NCB) based frequency selective uplink precoding, as further described in detail elsewhere herein. For example, the controller / processor 240 of the base station 110, the controller / processor 280 of the UE 120, or Figure 2 Any other component may perform or direct e.g. Figure 8 The process of 800 Fig. 9 The process of 900 Fig.10 The process of 1000 Fig.11 Process 1100, Fig.12 The process 1200 Fig.13 1300, or other processes as described herein. Memory 242 and memory 282 may store data and program codes for base station 110 and UE 120, respectively. In some aspects, memory 242 or memory 282 may include a non-transitory computer-readable medium storing one or more instructions for wireless communication. For example, the one or more instructions, when executed by one or more processors of base station 110 or UE 120, may perform or direct, for example, Figure 8 The process of 800 Fig. 9 The process of 900 Fig.10 The process of 1000 Fig.11 Process 1100, Fig.12 The process 1200 Fig.13 The scheduler 246 may schedule UEs for data transmission on the downlink or uplink.

[0065] In some aspects, UE 120 may include: a unit for determining whether the bandwidth of the SRS resources is less than the bandwidth of the PUSCH resources or greater than or equal to the bandwidth of the PUSCH resources; a unit for precoding PUSCH communications to be sent in the PUSCH resources using either: a wideband precoder based on a determination that the bandwidth of the SRS resources is less than the bandwidth of the PUSCH resources; or a subband-specific precoder based on a determination that the bandwidth of the SRS resources is greater than or equal to the bandwidth of the PUSCH resources; a unit for sending precoded PUSCH communications; and other examples. In some aspects, these units may include combining Figure 2One or more components of UE 120 are depicted, such as controller / processor 280, transmit processor 264, TX MIMO processor 266, MOD 254, antenna 252, DEMOD 254, MIMO detector 256, receive processor 258, and other examples.

[0066] In some aspects, the UE 120 may include: means for precoding a first portion of a PUSCH communication to be sent in a portion of the PUSCH resources that overlaps with a bandwidth of the SRS resources using a first precoder; means for precoding a second portion of a PUSCH communication to be sent in a portion of the PUSCH resources that does not overlap with a bandwidth of the SRS resources using a second precoder; means for sending the precoded PUSCH communication; and other examples. In some aspects, these means may include combining Figure 2 One or more components of UE 120 are depicted, such as controller / processor 280, transmit processor 264, TX MIMO processor 266, MOD 254, antenna 252, DEMOD 254, MIMO detector 256, receive processor 258, and other examples.

[0067] In some aspects, the UE 120 may include: means for receiving an SRS resource indicator identifying a subset of SRS resources in a set of SRS resources associated with precoding of PUSCH communications to be sent in PUSCH resources; means for precoding PUSCH communications based at least in part on the subband-specific SRS resource indicator; means for sending the precoded PUSCH communications; and other examples. In some aspects, these means may include combining Figure 2 One or more components of UE 120 are depicted, such as controller / processor 280, transmit processor 264, TX MIMO processor 266, MOD 254, antenna 252, DEMOD 254, MIMO detector 256, receive processor 258, and other examples.

[0068] In some aspects, the base station 110 may include: a unit for determining whether the bandwidth of the SRS resources is less than the bandwidth of the PUSCH resources or greater than or equal to the bandwidth of the PUSCH resources; a unit for receiving PUSCH communications sent in the PUSCH resources using any of the following methods: based on determining that the bandwidth of the SRS resources is less than the bandwidth of the PUSCH resources, using a wideband precoder; or based on determining that the bandwidth of the SRS resources is greater than or equal to the bandwidth of the PUSCH resources, using a subband-specific precoder; and other examples. In some aspects, these units may include combining Figure 2One or more components of base station 110 are depicted, such as antenna 234, DEMOD 232, MIMO detector 236, receive processor 238, controller / processor 240, transmit processor 220, TX MIMO processor 230, MOD 232, antenna 234, and other examples.

[0069] In some aspects, the base station 110 may include: a unit for receiving a first portion of a PUSCH communication sent in a portion of a PUSCH resource that overlaps with a bandwidth of an SRS resource using a first precoder, wherein the first portion of the PUSCH communication is precoded using the first precoder; and a unit for receiving a second portion of a PUSCH communication sent in a portion of a PUSCH resource that does not overlap with a bandwidth of an SRS resource using a second precoder, wherein the second portion of the PUSCH communication is precoded using the second precoder; and other examples. In some aspects, these units may include combining Figure 2 One or more components of base station 110 are depicted, such as antenna 234, DEMOD 232, MIMO detector 236, receive processor 238, controller / processor 240, transmit processor 220, TX MIMO processor 230, MOD 232, antenna 234, and other examples.

[0070] In some aspects, the base station 110 may include: means for transmitting an SRS resource indicator identifying a subset of SRS resources in a set of SRS resources associated with precoding a PUSCH communication to be transmitted in a PUSCH resource; means for receiving a PUSCH communication after transmitting a subband-specific SRS resource indicator, wherein the PUSCH communication is precoded based at least in part on the subband-specific SRS resource indicator; and other examples. In some aspects, these means may include combining Figure 2 One or more components of base station 110 are depicted, such as antenna 234, DEMOD 232, MIMO detector 236, receive processor 238, controller / processor 240, transmit processor 220, TX MIMO processor 230, MOD 232, antenna 234, and other examples.

[0071] In some wireless communication systems, a wireless communication device (e.g., UE 120, base station 110) is capable of simultaneously transmitting one or more data streams from multiple different antennas. Typically, precoding is applied to the data stream to distribute the data stream between the antennas. That is, the data stream is multiplied with different weights and phase offsets before being transmitted from the corresponding antenna. Precoding is the process of distributing incoming data (e.g., layered data) to different antenna ports. This can provide single-stream beamforming, in which the same data stream is transmitted on each antenna. Here, the linear combination signal transmitted from multiple antennas produces a directional radiation beam. This is generally referred to as beamforming. In another example, referred to as multiple-input multiple-output (MIMO), multiple data streams can be precoded and transmitted from different antennas. With the help of spatial diversity provided by individually positioned antennas, the total capacity of the channel can be multiplied by the number of layers or streams.

[0072] In some cases, associated with performing uplink precoding, the base station may provide the UE with a precoding matrix indicator (PMI) from a predefined codebook. The UE may then select a precoder for uplink transmission (e.g., uplink MIMO transmission) from the codebook based on the PMI. Alternatively, in some cases, the UE may select a precoder that is not necessarily limited to the codebook. This non-codebook (NCB) based precoding provides the UE with the flexibility to select a precoder that is well suited for the transmission channel. In the case of NCB based uplink precoding, downlink signaling is reduced because the base station does not need to signal the PMI or precoder to the UE.

[0073] In some cases, in order to implement NCB-based uplink precoding, only the use of a wideband sounding reference signal (SRS) resource indicator field is supported. The wideband SRS resource indicator (SRI) field corresponds to a predetermined combination of SRS resources in a configuration set of SRS resources. Here, the UE can be configured to determine the precoder and transmission rank based on the wideband SRI field. The UE can receive a wideband SRI in the downlink control information (DCI). In order to determine the PUSCH precoder in the NCB-based uplink MIMO, only the signaling of SRI can be supported (in the case of a transmitted PMI (TPMI) indication). Here, only one SRS port can be configured for each SRS resource, and the maximum number of SRS resources that can be configured for NCB-based uplink transmission is 4. Therefore, up to 4 SRS ports can be indicated by SRI using one DCI field. Note that in order to support higher rank transmission, multiple SRS resources should be indicated, and the UE can use specific SRS resources to be associated with precoding for a specific PUSCH layer. Typically, a UE may be configured with only one set of SRS resources with the following details: the UE may be configured to send up to n SRS resources simultaneously, where n is part of the UE capability signaling; and the SRS resources sent simultaneously occupy the same resource block (RB). The rank of the uplink transmission may be derived from the SRI field, and the encoding of the demodulation reference signal (DMRS) indicator may be determined based on the derived rank. The base station may be configured to determine the precoder used by the UE based on the DMRS indicator.

[0074] In some wireless communication systems, frequency selective uplink precoding based on NCB can be supported. Frequency selective uplink precoding based on NCB allows UE to use different NCB-based precoders in different allocated subbands of a given frequency band. Here, the UE and the base station should agree on the method used by the UE to select the NCB-based precoder across the allocated frequency resources. In some cases, frequency selective uplink precoding based on NCB can be performed as follows: an SRS resource can be composed of multiple SRS frequency hopping, where different hopping can be based on different precoders, and the base station indicates a broadband SRI. Here, the UE can implement frequency selective precoding based on the indicated broadband SRI. However, one disadvantage of this technology is that each frequency subband uses the same SRS resource. Therefore, the base station may not be able to optimize the subband-specific precoder, because the subband-specific precoder is determined by the UE when sending the SRS hopping. In other words, the current implementation of frequency selective uplink precoding based on NCB does not provide control of the frequency selective precoder, which may cause significant UE-to-UE interference.

[0075] Some aspects described herein provide techniques and apparatus for subband-specific SRI indication for frequency selective uplink precoding based on NCB. In some aspects, subband-specific SRI indication for frequency selective precoding based on NCB provides improved control of the frequency selective precoder, thereby enabling reduction of inter-UE interference. Example aspects for implementing subband-specific SRI indication for frequency selective precoding based on NCB in various scenarios are described below.

[0076] Figure 3 , 4A -4C, 5A-5D, 6A-6D, 7A and Figure 7B is a schematic diagram associated with subband-specific SRI indication for NCB-based frequency selective uplink precoding in accordance with various aspects of the present disclosure.

[0077] In some aspects, a UE (e.g., UE 120) may be configured to precode PUSCH communications using a wideband precoder or using one or more subband-specific precoders based at least in part on a bandwidth of SRS resources and a bandwidth of PUSCH resources associated with transmitting the PUSCH communications.

[0078] Figure 3 is a schematic diagram illustrating a first example of precoding a PUSCH communication based at least in part on a bandwidth of an SRS resource and a bandwidth of a PUSCH resource associated with transmitting the PUSCH communication. Figure 3 In the present invention, a UE (eg, UE 120) is configured with SRS resources by a base station (eg, base station 110) and is scheduled by the base station to send PUSCH communications in PUSCH resources.

[0079] like Figure 3 As shown, in the first operation 305, the UE may determine whether the bandwidth of the SRS resource configured for the UE is less than the bandwidth of the PUSCH resource or greater than or equal to the bandwidth of the PUSCH resource. For example, the UE may compare the bandwidth of the configured SRS resource with the bandwidth of the PUSCH resource to determine whether the bandwidth of the SRS resource is less than, greater than or equal to the bandwidth of the PUSCH resource.

[0080] In a second operation 310, in some aspects, when the UE determines that the bandwidth of the SRS resources is less than the bandwidth of the PUSCH resources, the UE may precode the PUSCH communication using a wideband precoder (e.g., based at least in part on a wideband SRI indication signaled by the base station 110). Alternatively, as further indicated by operation 310, when the UE determines that the bandwidth of the SRS resources is greater than or equal to the bandwidth of the PUSCH resources, the UE may precode the PUSCH communication using a subband-specific precoder. In some aspects, the subband-specific precoder may be signaled to the UE in the subband-specific SRI using techniques described below.

[0081] In a third operation 315, in some aspects the UE may send the PUSCH communication in the PUSCH resources after precoding the PUSCH communication (eg, using a wideband precoder or a subband-specific precoder).

[0082] In some aspects, a base station (e.g., base station 110) may receive a PUSCH communication after a UE sends a PUSCH communication. For example, the base station may determine whether the bandwidth of the SRS resources is less than the bandwidth of the PUSCH resources or greater than or equal to the bandwidth of the PUSCH resources (e.g., in a manner similar to the UE). The base station may then receive the PUSCH communication in the PUSCH resources using a wideband precoder (when the bandwidth of the SRS resources is determined to be less than the bandwidth of the PUSCH resources) or using a subband-specific precoder (when the bandwidth of the SRS resources is determined to be greater than or equal to the bandwidth of the PUSCH resources).

[0083] Figures 4A-4C is a schematic diagram associated with a second example, which illustrates precoding a PUSCH communication based at least in part on a bandwidth of an SRS resource and a bandwidth of a PUSCH resource associated with transmitting the PUSCH communication. Figures 4A-4C In the present invention, the UE is configured with SRS resources and is scheduled to send PUSCH communications in PUSCH resources.

[0084] like Figure 4AAs shown in, in the first operation 405, the UE may precode the first part of the PUSCH communication using a first precoder. Here, the first part of the PUSCH communication will be sent in a portion of the PUSCH resources that overlaps with the bandwidth of the SRS resources. In some aspects, the first precoder may include one or more subband-specific precoders. Therefore, in some aspects, the UE may perform subband-specific precoding on a portion of the PUSCH communication that overlaps with the SRS resources. In some aspects, the first precoder may be associated with an SRI provided by the base station (e.g., an SRI indicated by signaling that schedules the PUSCH resources). In some aspects, the techniques described below may be used to signal the subband-specific precoder to the UE in the subband-specific SRI.

[0085] In a second operation 410, the UE may precode a second portion of the PUSCH communication using a second precoder. Here, the second portion of the PUSCH communication is to be sent in a portion of the PUSCH resource that does not overlap with the bandwidth of the SRS resource. In some aspects, the second precoder may be a wideband precoder. Thus, in some aspects, the UE may perform wideband precoding on a portion of the PUSCH communication that does not overlap with the SRS resource.

[0086] In a third operation 415, the UE may send the PUSCH communication in the PUSCH resources after precoding the first and second parts of the PUSCH communication.

[0087] In some aspects, when the bandwidth of the SRS resources overlaps with the bandwidth of the PUSCH resources and when the bandwidth of the SRS resources is less than the bandwidth of the PUSCH resources, the UE may precode the first part and the second part of the PUSCH communication in the manner described above. For example, the UE may compare the bandwidth of the configured SRS resources and the bandwidth of the PUSCH resources, and determine that the bandwidth of the SRS resources overlaps with the bandwidth of the PUSCH resources and is less than the bandwidth of the PUSCH resources, and may proceed accordingly.

[0088] Figure 4B and Figure 4C It shows that the UE can Figure 4A The associated description provides a manner of precoding the first part and the second part of the PUSCH communication. Figure 4B The SRS resources are shown to have a smaller bandwidth compared to the PUSCH resource bandwidth. Figure 4C FIG. 4 shows how the UE can precode PUSCH communications. Figure 4CAs shown, the UE can use one or more subband-specific precoders to precode the portion of the PUSCH communication that overlaps with the bandwidth of the SRS resources (identified as SB precoding 1A to 1C), and can use one or more wideband precoders to precode the portion of the PUSCH communication that does not overlap with the SRS resources (identified as WB precoding 0 and 1).

[0089] In some aspects, a base station (e.g., base station 110) may receive a first portion and a second portion of a PUSCH communication after a UE transmits a PUSCH communication. For example, the base station may receive a first portion of a PUSCH communication transmitted in a portion of a PUSCH resource that overlaps a bandwidth of an SRS resource using a first precoder (e.g., because the first portion of the PUSCH communication is precoded using the first precoder). Similarly, the base station may receive a second portion of a PUSCH communication transmitted in a portion of a PUSCH resource that does not overlap a bandwidth of an SRS resource using a second precoder (e.g., because the second portion of the PUSCH communication is precoded using the second precoder).

[0090] In some aspects, a UE (e.g., UE 120) may precode (at least a portion of) a PUSCH communication based at least in part on a subband-specific SRI. In some aspects, the subband-specific SRI may identify a subset of SRS resources in a set of SRS resources that are associated with precoding a PUSCH communication (to be sent in a PUSCH resource).

[0091] Figure 5 is a diagram illustrating an example of precoding (at least a portion of) a PUSCH communication based at least in part on a subband-specific SRI.

[0092] like Figure 5 As shown, in a first operation 505, the UE may receive a subband-specific SRI. In some aspects, the subband-specific SRI may identify one or more SRS resource subsets associated with precoding PUSCH communications in a set of SRS resources configured on the UE. In other words, in some aspects, the subband-specific SRI may identify a subset of SRS resources associated with precoded data to be sent in a given subband. Figures 6A-6G , 7A and Figure 7B To provide additional details about the sub-band specific SRI.

[0093] In a second operation 510, the UE may precode the PUSCH communication based at least in part on the subband-specific SRS resource indicator. For example, the UE may precode one or more portions of the PUSCH communication using one or more subband-specific precoders, as indicated by the subband-specific SRI. In a third operation 515, the UE may send the PUSCH communication after precoding the PUSCH communication based at least in part on the subband-specific SRS resource indicator.

[0094] In some aspects, a base station (e.g., base station 110) may receive a portion of a PUSCH communication after a UE transmits a PUSCH communication. For example, the base station may transmit a subband-specific SRS resource indicator that identifies a subset of SRS resources associated with precoding of the PUSCH communication to be transmitted in the PUSCH resources. The base station may then receive the portion of the PUSCH communication after transmitting the subband-specific SRS resource indicator (e.g., after the UE precodes the PUSCH communication based at least in part on the identified SRS resources).

[0095] In some aspects, when the bandwidth of the SRS resource set is greater than or equal to the bandwidth of the PUSCH resources, a subband-specific SRI may be used. Fig. 6A This situation is shown in , where the bandwidth of the set of SRS resources (SRS0 to SRS3) is equal to the bandwidth of the PUSCH resources (including the bandwidth of subbands SB0 to SB3).

[0096] In such an aspect, the subband-specific SRI may include information identifying a joint rank associated with all subbands of the PUSCH resources and information identifying a subset of the SRS resource set for each subband of the PUSCH resources. Figure 6B is a diagram illustrating an example associated with a subband-specific SRI, which includes information identifying a joint rank associated with all subbands of PUSCH resources and information identifying a subset in an SRS resource set for each subband of PUSCH resources.

[0097] Similarly, in some aspects, the subband-specific SRI may include information identifying the joint rank and subset of the set of SRS resources for each subband of PUSCH resources.

[0098] In some aspects, the subband-specific SRI may include information identifying a joint rank associated with all subbands of the PUSCH resources and information identifying a differential subband-specific SRI for each subband of the PUSCH resources. Here, the differential subband-specific SRS resource indication may include at least one wideband SRS resource indication (which identifies an SRS resource common to all subbands) and a subband-specific subset of the SRS resource set for each subband. Figure 6C is a schematic diagram showing an example associated with a subband-specific SRI, which includes: information identifying a joint rank associated with all subbands of PUSCH resources, and information identifying a differential subband-specific SRI for each subband of the PUSCH resources.

[0099] Similarly, in some aspects, the subband-specific SRI may include information identifying the joint rank and differential subband-specific SRS resource indication for each subband for PUSCH resources. Here, the differential subband-specific SRS resource indication may include at least one wideband SRS resource indication identifying an SRS resource common to all subbands and a subband-specific subset of the SRS resource set for each subband.

[0100] Figure 6D-6G Example details for generating an SRI are provided, including identifying a differential subband-specific SRI for each subband of PUSCH resources for various maximum PUSCH ranks (L_max) and various numbers of SRS resources (N_srs) for NCB-based sounding.

[0101] exist Fig.6D In the example shown, the maximum rank is 1 (L_max=1), the number of NCB-based SRS resources is 3 (N_srs=3), 2 bits are used to indicate the SRS resource indicator common to all subbands (WB-SRI=2 bits), and 1 bit is used to indicate the subband-specific SRS resource indicator (SB_SRI=1 bit). Here, the WB_SRI set to 0, 1, or 2 corresponds to the case where the subband-specific SRS resource can only be selected from the SRS resource pairs of (1,2), (0,2), or (0,1), respectively, and the 1-bit SB_SRI further identifies the subband-specific SRS resource from the corresponding SRS resource pair.

[0102] exist Fig. 6E In the example shown, the maximum rank is 2 (L_max=2). Fig. 6EIn the example shown in the upper left corner, the number of SRS resources based on NCB is 2 (N_srs=2), 1 bit is used to indicate the SRS resource indicator common to all subbands (WB-SRI=1 bit), and 1 bit is used to indicate the subband-specific SRS resource indicator (SB_SRI=1 bit). When the rank is 1 (Rank=1), the WB-SRI is set to 0 (WB_SRI=0), and the 1-bit SB_SRI identifies the subband-specific SRS resource from two possible SRS resources. When the rank is 2 (Rank=2), the WB-SRI is set to 1 (WB_SRI=1), and since there are only two SRS resources, the 1-bit SB_SRI is not used (for example, because both SRS resources should be used to send PUSCH communications of rank 2).

[0103] exist Fig. 6E In the example shown in the upper right corner, the number of NCB-based SRS resources is 3 (N_srs=3), 3 bits are used to indicate the SRS resource indicator common to all subbands (WB-SRI=3 bits), and 1 bit is used to indicate the subband-specific SRS resource indicator (SB_SRI=1 bit). When the rank is 2 (Rank=2), the WB_SRI set to 0, 1, or 2 corresponds to selecting a single common SRS resource for all subbands from resources (0, 1, 2) from three corresponding SRS resources. The 1-bit SB_SRI further identifies another subband-specific SRS resource from the remaining two SRS resources. When the rank is 1 (Rank=1), the WB_SRI set to 3, 4, or 5 corresponds to the case where a subband-specific SRS resource can only be selected from the SRS resource pairs of (0,1), (0,2), or (1,2), respectively, and the 1-bit SB_SRI further identifies the subband-specific SRS resource from the corresponding SRS resource pair.

[0104] exist Fig. 6E In the example shown at the bottom, the number of NCB-based SRS resources is 4 (N_srs=4), 3 bits are used to indicate the SRS resource indicator common to all subbands (WB-SRI=3 bits), and 2 bits are used to indicate the subband-specific SRS resource indicator (SB_SRI=2 bits). When the rank is 2 (Rank=2), WB_SRI set to 0, 1, 2, or 3 corresponds to selecting a single common SRS resource for all subbands from the resources (0, 1, 2, 3) from the four corresponding SRS resources. The 2-bit SB_SRI further identifies the subband-specific SRS resource from the remaining three SRS resources. When the rank is 1 (Rank=1), WB_SRI is set to 4, and the 2-bit SB_SRI identifies one SRS resource among the four SRS resources.

[0105] exist Fig. 6F In the example shown, the maximum rank is 3 (L_max=3). Fig. 6F In the example shown at the top, the number of NCB-based SRS resources is 3 (N_srs=3), 3 bits are used to indicate an SRS resource indicator common to all subbands (WB-SRI=3 bits), and 1 bit is used to indicate a subband-specific SRS resource indicator (SB_SRI=1 bit). When the rank is 1 (Rank=1), the WB_SRI set to 0, 1, or 2 corresponds to the case where the subband-specific SRS resource can only be selected from the SRS resource pairs of (1,2), (0,2), or (0,1), respectively, and the 1-bit SB_SRI further identifies the subband-specific SRS resource from the corresponding SRS resource pair. When the rank is 2 (Rank=2), the WB-SRI set to 3, 4, or 5 corresponds to selecting a single common SRS resource for all subbands from resources (0, 1, 2) from three corresponding SRS resources. The 1-bit SB_SRI further identifies another subband-specific SRS resource from the remaining two SRS resources. When the rank is 3 (Rank=3), the WB-SRI is set to 6 (WB_SRI=6), and since there are only three SRS resources, the 1-bit SB_SRI is not used (eg, since all three SRS resources should be used to send rank 3 PUSCH communications).

[0106] exist Fig. 6F In the example shown at the bottom, the number of NCB-based SRS resources is 4 (N_srs=4), 4 bits are used to indicate the SRS resource indicator common to all subbands (WB-SRI=4 bits), and 2 bits are used to indicate the subband-specific SRS resource indicator (SB_SRI=2 bits). When the rank is 1 (Rank=1), the WB_SRI is set to 0 (WB_SRI=0), and the 2-bit SB_SRI identifies the subband-specific SRS resource from four possible SRS resources. When the rank is 2 (Rank=2), the WB_SRI set to 1, 2, 3, or 4 corresponds to selecting a single common SRS resource for all subbands from the four corresponding SRS resources (0, 1, 2, 3). The 2-bit SB_SRI further identifies the subband-specific SRS resource from the remaining three SRS resources. When Rank=3, WB_SRI set to 5, 6, 7 or 8 corresponds to selecting a single common SRS resource for all subbands from among the four corresponding SRS resources (0, 1, 2, 3). The 2-bit SB_SRI further identifies a pair of subband-specific SRS resources from among the remaining three SRS resources.

[0107] exist Figure 6GIn the example shown, the maximum rank is 4 (L_max=4), the number of NCB-based SRS resources is 4 (N_srs=4), 4 bits are used to indicate the SRS resource indicator common to all subbands (WB-SRI=4 bits), and 2 bits are used to indicate the subband-specific SRS resource indicator (SB_SRI=2 bits). When the rank is 1 (Rank=1), the WB_SRI is set to 0 (WB_SRI=0), and the 2-bit SB_SRI identifies the subband-specific SRS resource from four possible SRS resources. When the rank is 2 (Rank=2), the WB_SRI set to 1, 2, 3, or 4 corresponds to selecting a single common SRS resource for all subbands from the four corresponding SRS resources (0, 1, 2, 3). The 2-bit SB_SRI further identifies the subband-specific SRS resource from the remaining three SRS resources. When the rank is 3 (Rank=3), WB_SRI set to 5, 6, 7 or 8 corresponds to selecting a single common SRS resource for all subbands from the four corresponding SRS resources (0, 1, 2, 3). The 2-bit SB_SRI further identifies a pair of subband-specific SRS resources from the remaining three SRS resources. When the rank is 4 (Rank=4), the WB-SRI is set to 9 (WB_SRI=9), and since there are only four SRS resources, the 2-bit SB_SRI is not used (for example, because all four SRS resources should be used to send rank 4 PUSCH communications).

[0108] In some aspects, when multiple SRS resources in an SRS resource set occupy different frequency resources and include a bandwidth that is greater than or equal to the bandwidth of the PUSCH resource, a subband-specific SRI may be used. Fig. 7A This situation is shown in , where the bandwidth of the SRS resource set (SRS0 to SRS15) is equal to the bandwidth of the PUSCH resources (which includes the bandwidth of subbands SB0 to SB3).

[0109] In such aspects, the subband-specific SRI may include information for associating a layer of a PUSCH communication with a subset of a set of SRS resources, wherein the subset of the set of SRS resources includes a bandwidth that is greater than or equal to a bandwidth of the PUSCH resources. Figure 7B is a diagram illustrating an example of associating with a subband-specific SRI including information associating a layer of a PUSCH communication with a subset of a set of SRS resources including a bandwidth greater than or equal to that of a PUSCH resource.

[0110] Figure 88 is a diagram illustrating an example process 800 performed, for example, by a user equipment according to various aspects of the present disclosure. Example process 800 is an example of a user equipment (e.g., user equipment 120 and other examples) performing operations associated with subband-specific SRI indication for frequency selective uplink precoding based on NCB.

[0111] like Figure 8 As shown, in some aspects, process 800 may include determining whether a bandwidth of SRS resources is less than a bandwidth of PUSCH resources or greater than or equal to a bandwidth of PUSCH resources (block 810). For example, the user equipment may determine (e.g., using receive processor 258, transmit processor 264, controller / processor 280, memory 282, and other examples) whether a bandwidth of SRS resources is less than a bandwidth of PUSCH resources or greater than or equal to a bandwidth of PUSCH resources, as described above.

[0112] like Figure 8 As further shown, in some aspects, process 800 may include precoding PUSCH communications to be sent in PUSCH resources using either a wideband precoder based on a determination that the bandwidth of the SRS resources is less than the bandwidth of the PUSCH resources or a subband-specific precoder based on a determination that the bandwidth of the SRS resources is greater than or equal to the bandwidth of the PUSCH resources (block 820). For example, the user equipment may (e.g., using transmit processor 264, controller / processor 280, memory 282, and other examples) precode PUSCH communications to be sent in PUSCH resources using either a wideband precoder based on a determination that the bandwidth of the SRS resources is less than the bandwidth of the PUSCH resources or a subband-specific precoder based on a determination that the bandwidth of the SRS resources is greater than or equal to the bandwidth of the PUSCH resources, as described above.

[0113] like Figure 8 As further shown, in some aspects, process 800 may include sending a precoded PUSCH communication (block 830). For example, the user equipment may (e.g., using transmit processor 264, controller / processor 280, memory 282, and other examples) send the precoded PUSCH communication after precoding the PUSCH communication, as described above.

[0114] Although Figure 8 Example blocks of process 800 are shown, but in some aspects, Figure 8 Compared with the description in the above, process 800 may include additional blocks, fewer blocks, different blocks, or blocks in a different arrangement. Additionally or alternatively, two or more blocks in the blocks of process 800 may be performed in parallel.

[0115] Fig. 9 9 is a diagram illustrating an example process 900 performed, for example, by a user equipment according to various aspects of the present disclosure. Example process 900 is an example of a user equipment (e.g., user equipment 120 and other examples) performing operations associated with subband-specific SRI indication for frequency selective uplink precoding based on NCB.

[0116] like Fig. 9 As shown, in some aspects, process 900 may include: using a first precoder to precode a first portion of a PUSCH communication to be sent in a portion of the PUSCH resources that overlaps with a bandwidth of the SRS resources (block 910). For example, the user equipment may (e.g., using the transmit processor 264, the controller / processor 280, the memory 282, and other examples) use the first precoder to precode a first portion of a PUSCH communication to be sent in a portion of the PUSCH resources that overlaps with a bandwidth of the SRS resources, as described above.

[0117] like Fig. 9 As further shown, in some aspects, process 900 may include: precoding a second portion of PUSCH communications to be sent in a portion of the PUSCH resources that does not overlap with a bandwidth of the SRS resources using a second precoder (block 920). For example, the user equipment may (e.g., using transmit processor 264, controller / processor 280, memory 282, and other examples) precode a second portion of PUSCH communications to be sent in a portion of the PUSCH resources that does not overlap with a bandwidth of the SRS resources using a second precoder, as described above.

[0118] like Fig. 9 As further shown, in some aspects, process 900 may include sending a precoded PUSCH communication (block 930). For example, the user equipment may (e.g., using transmit processor 264, controller / processor 280, memory 282, and other examples) send the precoded PUSCH communication after precoding the first portion of the PUSCH communication and the second portion of the PUSCH communication, as described above.

[0119] Process 900 may include additional aspects, such as any single aspect or any combination of aspects described below or in combination with one or more other processes described elsewhere herein.

[0120] In a first additional aspect, the bandwidth of the SRS resources is smaller than the bandwidth of the PUSCH resources.

[0121] In a second further aspect, alone or in combination with the first aspect, the first precoder is associated with an SRS resource indicator indicated by signaling scheduling the PUSCH resources.

[0122] In a third further aspect, alone or in combination with one or more of the first and second aspects, the first precoder comprises a plurality of subband-specific precoders.

[0123] In a fourth further aspect, alone or in combination with one or more of the first to third aspects, the second precoder is a wideband precoder.

[0124] although Fig. 9 Example blocks of process 900 are shown, but in some aspects process 900 may include Fig. 9 The blocks depicted in the process 900 may be additional blocks, fewer blocks, different blocks, or differently arranged blocks than those depicted in the process 900. Additionally or alternatively, two or more blocks of the blocks in the process 900 may be executed in parallel.

[0125] Fig.10 1 is a diagram illustrating an example process 1000 performed, for example, by a user equipment according to various aspects of the present disclosure. Example process 1000 is an example of a user equipment (e.g., user equipment 120 and other examples) performing operations associated with subband-specific SRI indication for frequency selective uplink precoding based on NCB.

[0126] like Fig.10 As shown, in some aspects, process 1000 may include receiving a sub-band SRS resource indicator identifying a subset of SRS resources in a set of SRS resources, the subset of SRS resources being associated with precoding of PUSCH communications to be sent in PUSCH resources (block 1010). For example, a user device may (e.g., using receive processor 258, controller / processor 280, memory 282, and other examples) receive a sub-band SRS resource indicator identifying a subset of SRS resources in a set of SRS resources, wherein the subset of SRS resources is associated with precoding of PUSCH communications to be sent in PUSCH resources, as described above.

[0127] like Fig.10 As further shown, in some aspects, process 1000 may include precoding PUSCH communications based at least in part on the subband-specific SRS resource indicator (block 1020). For example, the user equipment may (e.g., using transmit processor 264, controller / processor 280, memory 282, and other examples) precode PUSCH communications based at least in part on the subband-specific SRS resource indicator, as described above.

[0128] like Fig.10 As further shown, in some aspects, process 1000 may include sending a precoded PUSCH communication (block 1030). For example, the user equipment may (e.g., using transmit processor 264, controller / processor 280, memory 282, and other examples) send the PUSCH communication after precoding the PUSCH communication based at least in part on the subband-specific SRS resource indicator, as described above.

[0129] Process 1000 may include additional aspects, such as any single aspect or any combination of aspects described below or in combination with one or more other processes described elsewhere herein.

[0130] In a first additional aspect, a bandwidth of the SRS resource set is greater than or equal to a bandwidth of the PUSCH resources.

[0131] In a second further aspect, either alone or in combination with the first aspect, the subband-specific SRS resource indicator comprises information identifying a joint rank associated with all subbands of the PUSCH resources, and information identifying a subset of the SRS resource set for each subband of the PUSCH resources.

[0132] In a third further aspect, alone or in combination with one or more of the first and second aspects, the subband-specific SRS resource indicator comprises information identifying a joint rank and a subset of the SRS resource set for each subband of the PUSCH resources.

[0133] In a fourth additional aspect, alone or in combination with one or more of the first to third aspects, the subband-specific SRS resource indicator comprises information identifying a joint rank associated with all subbands of the PUSCH resources, and information identifying a differential subband-specific SRS resource indication for each subband of the PUSCH resources. In some aspects, the differential subband-specific SRS resource indication comprises at least one wideband SRS resource indication identifying an SRS resource common to all subbands and a subband-specific subset of the SRS resource set for each subband.

[0134] In a fifth additional aspect, alone or in combination with one or more of the first to fourth aspects, the subband-specific SRS resource indicator comprises information identifying a joint rank and a differential subband-specific SRS resource indication for each subband of the PUSCH resources. In some aspects, the differential subband-specific SRS resource indication comprises at least one wideband SRS resource indication identifying an SRS resource common to all subbands and a subband-specific subset of the SRS resource set for each subband.

[0135] In a sixth additional aspect, either alone or in combination with one or more of the first to fifth aspects, the multiple SRS resources in the SRS resource set occupy different frequency resources and include a bandwidth that is greater than or equal to the bandwidth of the PUSCH resources.

[0136] In a seventh additional aspect, either alone or in combination with one or more of the first to sixth aspects, the subband-specific SRS resource indicator comprises information associating a layer of the PUSCH communication with a subset of the SRS resource set, the bandwidth of the subset of the SRS resource set being greater than or equal to the bandwidth of the PUSCH resources.

[0137] although Fig.10 Example blocks of process 1000 are shown, but in some aspects, process 1000 may include Fig.10 The blocks depicted in the process 1000 may be additional blocks, fewer blocks, different blocks, or differently arranged blocks than those depicted in the process 1000. Additionally or alternatively, two or more blocks of the blocks in the process 1000 may be executed in parallel.

[0138] Fig.11 1 is a diagram illustrating an example process 1100, for example, performed by a base station, in accordance with various aspects of the present disclosure. Example process 1100 is an example of a base station (e.g., base station 110 and other examples) performing operations associated with subband-specific SRI indication for frequency selective uplink precoding based on NCB.

[0139] like Fig.11 As shown, in some aspects, process 1100 may include determining whether a bandwidth of SRS resources is less than a bandwidth of PUSCH resources or greater than or equal to a bandwidth of PUSCH resources (block 1110). For example, a base station may determine (e.g., using transmit processor 220, receive processor 238, controller / processor 240, memory 242, and other examples) whether a bandwidth of SRS resources is less than a bandwidth of PUSCH resources or greater than or equal to a bandwidth of PUSCH resources, as described above.

[0140] like Fig.11As further shown, in some aspects, process 1100 may include receiving PUSCH communications sent in PUSCH resources using either: a wideband precoder based on a determination that the bandwidth of the SRS resources is less than the bandwidth of the PUSCH resources; or a subband-specific precoder based on a determination that the bandwidth of the SRS resources is greater than or equal to the bandwidth of the PUSCH resources (block 1120). For example, the base station may (e.g., using receive processor 238, controller / processor 240, memory 242, and other examples) receive PUSCH communications sent in PUSCH resources using either: a wideband precoder based on a determination that the bandwidth of the SRS resources is less than the bandwidth of the PUSCH resources; or a subband-specific precoder based on a determination that the bandwidth of the SRS resources is greater than or equal to the bandwidth of the PUSCH resources, as described above.

[0141] although Fig.11 Example blocks of process 1100 are shown, but in some aspects process 1100 may include Fig.11 The blocks depicted in the process 1100 may be additional blocks, fewer blocks, different blocks, or differently arranged blocks than those depicted in the process 1100. Additionally or alternatively, two or more blocks in the blocks of process 1100 may be executed in parallel.

[0142] Fig.12 1 is a diagram illustrating an example process 1200 performed, for example, by a base station in accordance with various aspects of the present disclosure. Example process 1200 is an example of a base station (eg, base station 110 and other examples) performing operations associated with subband-specific SRI indication for frequency selective uplink precoding based on NCB.

[0143] like Fig.12 As shown, in some aspects, process 1200 may include: using a first precoder to receive a first portion of a PUSCH communication sent in a portion of a PUSCH resource that overlaps a bandwidth of an SRS resource, wherein the first portion of the PUSCH communication is precoded using the first precoder (block 1210). For example, a base station may (e.g., using receive processor 238, controller / processor 240, memory 242, and other examples) use a first precoder to receive a first portion of a PUSCH communication sent in a portion of a PUSCH resource that overlaps a bandwidth of an SRS resource, wherein the first portion of the PUSCH communication is precoded using the first precoder, as described above.

[0144] like Fig.12As further shown, in some aspects, process 1200 may include: using a second precoder to receive a second portion of a PUSCH communication sent in a portion of the PUSCH resources that does not overlap with a bandwidth of the SRS resources, wherein the second portion of the PUSCH communication is precoded using the second precoder (block 1220). For example, the base station may (e.g., using receive processor 238, controller / processor 240, memory 242, and other examples) use a second precoder to receive a second portion of a PUSCH communication sent in a portion of the PUSCH resources that does not overlap with a bandwidth of the SRS resources, wherein the second portion of the PUSCH communication is precoded using the second precoder, as described above.

[0145] Process 1200 may include additional aspects, such as any single aspect or any combination of aspects described below or in combination with one or more other processes described elsewhere herein.

[0146] In a first additional aspect, the bandwidth of the SRS resources is smaller than the bandwidth of the PUSCH resources.

[0147] In a second further aspect, alone or in combination with the first aspect, the first precoder is associated with an SRS resource indicator indicated by signaling scheduling the PUSCH resources.

[0148] In a third further aspect, alone or in combination with one or more of the first and second aspects, the first precoder comprises a plurality of subband-specific precoders.

[0149] In a fourth further aspect, alone or in combination with one or more of the first to third aspects, the second precoder is a wideband precoder.

[0150] although Fig.12 Example blocks of process 1200 are shown, but in some aspects, process 1200 may include Fig.12 The blocks depicted in the process 1200 may be additional blocks, fewer blocks, different blocks, or differently arranged blocks than those depicted in the process 1200. Additionally or alternatively, two or more blocks in the blocks of process 1200 may be executed in parallel.

[0151] Fig.13 1 is a diagram illustrating an example process 1300, for example, performed by a base station, in accordance with various aspects of the present disclosure. Example process 1300 is an example of a base station (e.g., base station 110 and other examples) performing operations associated with subband-specific SRI indication for frequency selective uplink precoding based on NCB.

[0152] like Fig.13As shown, in some aspects, process 1300 may include sending a subband-specific SRS resource indicator identifying a subset of SRS resources in a set of SRS resources, the subset of SRS resources being associated with precoding a PUSCH communication to be sent in a PUSCH resource (block 1310). For example, a base station may (e.g., using transmit processor 220, controller / processor 240, memory 242, and other examples) send a subband-specific SRS resource indicator identifying a subset of SRS resources in a set of SRS resources, the subset of SRS resources being associated with precoding a PUSCH communication to be sent in a PUSCH resource, as described above.

[0153] like Fig.13 As further shown, in some aspects, process 1300 may include receiving a PUSCH communication after sending the subband-specific SRS resource indicator, wherein the PUSCH communication is precoded based at least in part on the subband-specific SRS resource indicator (block 1320). For example, the base station may (e.g., using receive processor 238, controller / processor 240, memory 242, and other examples) receive a PUSCH communication after sending the subband-specific SRS resource indicator, wherein the PUSCH communication is precoded based at least in part on the subband-specific SRS resource indicator, as described above.

[0154] Process 1300 may include additional aspects, such as any single aspect or any combination of aspects described below or in combination with one or more other processes described elsewhere herein.

[0155] In a first additional aspect, a bandwidth of the SRS resource set is greater than or equal to a bandwidth of the PUSCH resources.

[0156] In a second further aspect, either alone or in combination with the first aspect, the subband-specific SRS resource indicator comprises information identifying a joint rank associated with all subbands of the PUSCH resources, and information identifying a subset of the SRS resource set for each subband of the PUSCH resources.

[0157] In a third further aspect, alone or in combination with one or more of the first and second aspects, the subband-specific SRS resource indicator comprises information identifying a joint rank and a subset of the SRS resource set for each subband of the PUSCH resources.

[0158] In a fourth additional aspect, alone or in combination with one or more of the first to third aspects, the subband-specific SRS resource indicator comprises information identifying a joint rank associated with all subbands of the PUSCH resource, and information identifying a differential subband-specific SRS resource indication for each subband of the PUSCH resource. In this aspect, the differential subband-specific SRS resource indication comprises at least one wideband SRS resource indication identifying an SRS resource common to all subbands and a subband-specific subset of the SRS resource set for each subband.

[0159] In a fifth additional aspect, alone or in combination with one or more of the first to fourth aspects, the subband-specific SRS resource indicator comprises information identifying a joint rank and a differential subband-specific SRS resource indication for each subband of the PUSCH resources. In this aspect, the differential subband-specific SRS resource indication comprises at least one wideband SRS resource indication identifying an SRS resource common to all subbands and a subband-specific subset of the SRS resource set for each subband.

[0160] In a sixth additional aspect, either alone or in combination with one or more of the first to fifth aspects, the multiple SRS resources in the SRS resource set occupy different frequency resources and include a bandwidth that is greater than or equal to the bandwidth of the PUSCH resources.

[0161] In a seventh additional aspect, either alone or in combination with one or more of the first to sixth aspects, the subband-specific SRS resource indicator comprises information associating a layer of the PUSCH communication with a subset of the SRS resource set, the bandwidth of the subset of the SRS resource set being greater than or equal to the bandwidth of the PUSCH resources.

[0162] although Fig.13 Example blocks of process 1300 are shown, but in some aspects process 1300 may include Fig.13 The blocks depicted in the process 1300 may be additional blocks, fewer blocks, different blocks, or differently arranged blocks than those depicted in the process 1300. Additionally or alternatively, two or more blocks in the blocks of process 1300 may be executed in parallel.

[0163] Fig.141 is a block diagram of an example apparatus 1400 for wireless communication according to various aspects of the present disclosure. Apparatus 1400 may be a UE, or a UE may include apparatus 1400. In some aspects, apparatus 1400 includes a receiving component 1402, a communication manager 1404, and a sending component 1406 that may communicate with each other (e.g., via one or more buses). As shown, apparatus 1400 may communicate with another apparatus 1408 (such as a UE, a base station, or another wireless communication device) using receiving component 1402 and sending component 1406.

[0164] In some aspects, the apparatus 1400 may be configured to perform the Figure 3 , 4A -4C, 5, 6A-6C, 7A and Figure 7B Additionally or alternatively, the apparatus 1400 may be configured to perform one or more of the processes described herein (such as Figure 8 The process of 800 Fig. 9 The process of 900 Fig.10 In some aspects, the apparatus 1400 may include the above combined Figure 2 One or more components of a UE are described.

[0165] The receiving component 1402 may receive communications (such as reference signals, control information, data communications, or combinations thereof) from the device 1408. The receiving component 1402 may provide the received communications to one or more other components of the device 1400, such as the communications manager 1404. In some aspects, the receiving component 1402 may perform signal processing (such as filtering, amplification, demodulation, analog-to-digital conversion, demultiplexing, deinterleaving, demapping, equalization, interference cancellation, or decoding, among other examples) on the received communications and may provide the processed signals to one or more other components. In some aspects, the receiving component 1402 may include the above in combination with the communication manager 1404. Figure 2 One or more antennas, demodulators, MIMO detectors, receive processors, controllers / processors, memories, or combinations thereof of the described UE.

[0166] The transmission component 1406 may transmit communications (such as reference signals, control information, data communications, or a combination thereof) to the device 1408. In some aspects, the communication manager 1404 may generate communications and may transmit the generated communications to the transmission component 1406 for transmission to the device 1408. In some aspects, the transmission component 1406 may perform signal processing (such as filtering, amplification, modulation, digital-to-analog conversion, multiplexing, interleaving, mapping, or encoding, among other examples) on the generated communications and may transmit the processed signals to the device 1408. In some aspects, the transmission component 1406 may include the above in combination with Figure 2 One or more antennas, modulators, transmit MIMO processors, transmit processors, controllers / processors, memory, or combinations thereof of the described UE. In some aspects, the transmitting component 1406 can be co-located with the receiving component 1402 in a transceiver.

[0167] In some aspects, the communication manager 1404 may determine whether the bandwidth of the SRS resources is less than the bandwidth of the PUSCH resources or greater than or equal to the bandwidth of the PUSCH resources. In some aspects, the communication manager 1404 may precode the PUSCH communication to be sent in the PUSCH resources using either a wideband precoder based on a determination that the bandwidth of the SRS resources is less than the bandwidth of the PUSCH resources or a subband-specific precoder based on a determination that the bandwidth of the SRS resources is greater than or equal to the bandwidth of the PUSCH resources. In some aspects, after precoding the PUSCH communication, the communication manager 1404 may send or cause the sending component 1406 to send the PUSCH communication.

[0168] In some aspects, the communication manager 1404 may use a first precoder to precode a first portion of a PUSCH communication to be sent in a portion of the PUSCH resources that overlaps with the bandwidth of the SRS resources. In some aspects, the communication manager 1404 may use a second precoder to precode a second portion of a PUSCH communication to be sent in a portion of the PUSCH resources that does not overlap with the bandwidth of the SRS resources. In some aspects, after precoding the first portion of the PUSCH communication and the second portion of the PUSCH communication, the communication manager 1404 may send or cause the sending component 1406 to send the precoded PUSCH communication (for example).

[0169] In some aspects, the communication manager 1404 may receive or may cause the receiving component 1402 to receive a subband-specific SRS resource indicator identifying a subset of SRS resources in a set of SRS resources associated with precoding a PUSCH communication to be sent in a PUSCH resource. In some aspects, the communication manager 1404 may precode the PUSCH communication based at least in part on the subband-specific SRS resource indicator. In some aspects, after precoding the PUSCH communication based at least in part on the subband-specific SRS resource indicator, the communication manager 1404 may send or may cause the sending component 1406 to send the PUSCH communication.

[0170] In some aspects, the communications manager 1404 may include the above in combination with Figure 2 A controller / processor, a memory, or a combination thereof of a UE is described.

[0171] In some aspects, the communication manager 1404 may include a set of components such as the SRS component 1410, the precoding component 1412, or a combination thereof. Alternatively, the set of components may be separate and distinct components from the communication manager 1404. In some aspects, one or more of the components in the set of components may include the above combined components. Figure 2 The controller / processor, memory, scheduler, communication unit or combination thereof of the UE described, or may be combined with the above Figure 2 The controller / processor, memory, scheduler, communication unit, or a combination thereof of the UE described herein may be implemented in the controller / processor, memory, scheduler, communication unit, or a combination thereof. Additionally or alternatively, one or more components in the set of components may be at least partially implemented as software stored in the memory. For example, a component (or a portion of a component) may be implemented as an instruction or code stored in a non-transitory computer-readable medium and executable by a controller or processor to perform the function or operation of the component.

[0172] In some aspects, the SRS component 1410 can determine whether the bandwidth of the SRS resources is less than the bandwidth of the PUSCH resources or greater than or equal to the bandwidth of the PUSCH resources. In some aspects, the precoding component 1412 can precode the PUSCH communication to be sent in the PUSCH resources using either a wideband precoder based on a determination that the bandwidth of the SRS resources is less than the bandwidth of the PUSCH resources or a subband-specific precoder based on a determination that the bandwidth of the SRS resources is greater than or equal to the bandwidth of the PUSCH resources. In some aspects, the transmitting component 1406 can transmit the precoded PUSCH communication.

[0173] In some aspects, precoding component 1412 may use a first precoder to precode a first portion of a PUSCH communication to be sent in a portion of the PUSCH resources that overlaps with a bandwidth of the SRS resources. In some aspects, precoding component 1412 may use a second precoder to precode a second portion of a PUSCH communication to be sent in a portion of the PUSCH resources that does not overlap with a bandwidth of the SRS resources. In some aspects, after precoding the first portion of the PUSCH communication and the second portion of the PUSCH communication, transmitting component 1406 may transmit the PUSCH communication.

[0174] In some aspects, receiving component 1402 may receive a subband-specific SRS resource indicator identifying a subset of SRS resources in a set of SRS resources, the subset of SRS resources being associated with precoding a PUSCH communication to be sent in a PUSCH resource. In some aspects, precoding component 1412 may precode the PUSCH communication based at least in part on the subband-specific SRS resource indicator. In some aspects, after precoding the PUSCH communication based at least in part on the subband-specific SRS resource indicator, transmitting component 1406 may transmit the PUSCH communication.

[0175] Fig.14 The number and arrangement of components shown are provided as examples. Fig.14 There may be additional components, fewer components, different components, or differently arranged components than those shown in . Fig.14 Two or more components shown in may be implemented in a single component, or Fig.14 The single component shown may be implemented as multiple distributed components. Additionally or alternatively, Fig.14 The illustrated set of components (e.g., one or more components) may perform the operations described as being performed by Fig.14 One or more functions performed by another set of components shown in FIG.

[0176] Fig.15 1 is a block diagram of an example apparatus 1500 for wireless communication in accordance with various aspects of the present disclosure. Apparatus 1500 may be a base station, or a base station may include apparatus 1500. In some aspects, apparatus 1500 includes a receiving component 1502, a communication manager 1504, and a sending component 1506 that may communicate with each other (e.g., via one or more buses). As shown, apparatus 1500 may use receiving component 1502 and sending component 1506 to communicate with another apparatus 1508 (such as a UE, a base station, or another wireless communication device).

[0177] In some aspects, the apparatus 1500 may be configured to perform the Figure 3 , 4A -4C, 5, 6A-6C, 7A and Figure 7B Additionally or alternatively, the apparatus 1500 may be configured to perform one or more of the processes described herein (e.g., Fig.11 Process 1100, Fig.12 The process 1200 Fig.13 In some aspects, the apparatus 1500 may include the above combined Figure 2 One or more components of a base station are described.

[0178] The receiving component 1502 may receive communications (such as reference signals, control information, data communications, or combinations thereof) from the apparatus 1508. The receiving component 1502 may provide the received communications to one or more other components of the apparatus 1500, such as the communications manager 1504. In some aspects, the receiving component 1502 may perform signal processing (such as filtering, amplification, demodulation, analog-to-digital conversion, demultiplexing, deinterleaving, demapping, equalization, interference cancellation, or decoding, among other examples) on the received communications and may provide the processed signals to one or more other components. In some aspects, the receiving component 1502 may include the above in combination with the communication manager 1504. Figure 2 One or more antennas, demodulators, MIMO detectors, receive processors, controllers / processors, memories, or combinations thereof of the described base stations.

[0179] The transmission component 1506 may transmit communications (such as reference signals, control information, data communications, or a combination thereof) to the device 1508. In some aspects, the communication manager 1504 may generate communications and may transmit the generated communications to the transmission component 1506 for transmission to the device 1508. In some aspects, the transmission component 1506 may perform signal processing (such as filtering, amplification, modulation, digital-to-analog conversion, multiplexing, interleaving, mapping, or encoding, among other examples) on the generated communications and may transmit the processed signals to the device 1508. In some aspects, the transmission component 1506 may include the above in combination with Figure 2 One or more antennas, modulators, transmit MIMO processors, transmit processors, controllers / processors, memories, or combinations thereof of the described BS. In some aspects, the transmitting component 1506 can be co-located with the receiving component 1502 in a transceiver.

[0180] In some aspects, the communication manager 1504 may determine whether the bandwidth of the SRS resources is less than the bandwidth of the PUSCH resources or greater than or equal to the bandwidth of the PUSCH resources. In some aspects, the communication manager 1504 may receive or cause the receiving component 1502 to receive PUSCH communications sent in the PUSCH resources using any of the following: based on determining that the bandwidth of the SRS resources is less than the bandwidth of the PUSCH resources, using a wideband precoder; or based on determining that the bandwidth of the SRS resources is greater than or equal to the bandwidth of the PUSCH resources, using a subband-specific precoder.

[0181] In some aspects, the communication manager 1504 may receive a first portion of a PUSCH communication sent in a portion of the PUSCH resources that overlaps with a bandwidth of the SRS resources using a first precoder, or may cause the receiving component 1502 to receive a first portion of a PUSCH communication sent in a portion of the PUSCH resources that overlaps with a bandwidth of the SRS resources using a first precoder, wherein the first portion of the PUSCH communication is precoded using the first precoder. In some aspects, the communication manager 1504 may receive a second portion of a PUSCH communication sent in a portion of the PUSCH resources that does not overlap with a bandwidth of the SRS resources using a second precoder, or may cause the receiving component 1502 to receive a second portion of a PUSCH communication sent in a portion of the PUSCH resources that does not overlap with a bandwidth of the SRS resources using a second precoder, wherein the second portion of the PUSCH communication is precoded using the second precoder.

[0182] In some aspects, the communication manager 1504 may send or may cause the sending component 1506 to send a subband-specific SRS resource indicator identifying a subset of SRS resources in a set of SRS resources associated with precoding a PUSCH communication to be sent in a PUSCH resource. In some aspects, after sending the subband-specific SRS resource indicator, the communication manager 1504 may receive or may cause the receiving component 1502 to receive a PUSCH communication, wherein the PUSCH communication is precoded based at least in part on the subband-specific SRS resource indicator.

[0183] In some aspects, the communications manager 1504 may include the above in combination with Figure 2 A controller / processor, a memory, a scheduler, a communication unit, or a combination thereof of the described base station.

[0184] In some aspects, the communication manager 1504 may include a set of components such as the SRS component 1510. Alternatively, the set of components may be separate and distinct components from the communication manager 1504. In some aspects, one or more of the components in the set of components may include the above combined components. Figure 2 The controller / processor, memory, scheduler, communication unit or combination thereof of the base station described, or can be combined in the surface Figure 2 The controller / processor, memory, scheduler, communication unit, or a combination thereof of the base station described herein may be implemented in the controller / processor, memory, scheduler, communication unit, or a combination thereof. Additionally or alternatively, one or more components in the set of components may be at least partially implemented as software stored in the memory. For example, a component (or a portion of a component) may be implemented as an instruction or code stored in a non-transitory computer-readable medium and executable by a controller or processor to implement the function or operation of the component.

[0185] In some aspects, the SRS component 1510 can determine whether the bandwidth of the SRS resources is less than the bandwidth of the PUSCH resources or greater than or equal to the bandwidth of the PUSCH resources. In some aspects, the receiving component 1502 can receive the PUSCH communication sent in the PUSCH resources using any of the following methods: based on determining that the bandwidth of the SRS resources is less than the bandwidth of the PUSCH resources, using a wideband precoder; or based on determining that the bandwidth of the SRS resources is greater than or equal to the bandwidth of the PUSCH resources, using a subband-specific precoder.

[0186] In some aspects, receiving component 1502 may receive a first portion of a PUSCH communication sent in a portion of the PUSCH resources that overlaps a bandwidth of the SRS resources using a first precoder, wherein the first portion of the PUSCH communication is precoded using the first precoder. In some aspects, receiving component 1502 may receive a second portion of a PUSCH communication sent in a portion of the PUSCH resources that does not overlap a bandwidth of the SRS resources using a second precoder, wherein the second portion of the PUSCH communication is precoded using the second precoder.

[0187] In some aspects, transmitting component 1506 may transmit a subband-specific SRS resource indicator identifying a subset of SRS resources in a set of SRS resources associated with precoding a PUSCH communication to be transmitted in a PUSCH resource. In some aspects, after transmitting the subband-specific SRS resource indicator, receiving component 1502 may receive the PUSCH communication, wherein the PUSCH communication is precoded based at least in part on the subband-specific SRS resource indicator.

[0188] Fig.15The number and arrangement of components shown are provided as examples. Fig.15 There may be additional components, fewer components, different components, or differently arranged components than those shown in FIG. Fig.15 Two or more components shown in may be implemented in a single component, or Fig.15 The single component shown in can be implemented as multiple distributed components. Additionally or alternatively, Fig.15 A set (one or more components) of components shown in the figure may be executed as described by Fig.15 One or more functions performed by another set of components shown in FIG.

[0189] The foregoing disclosure provides illustration and description, but is not intended to be exhaustive or to limit the aspects to the precise forms disclosed. Modifications and variations may be made in light of the above disclosure, or may be acquired from implementation of the various aspects.

[0190] As used herein, the term "component" is intended to be broadly interpreted as hardware, firmware, or a combination of hardware and software. As used herein, a processor is implemented in hardware, firmware, or a combination of hardware and software.

[0191] As used herein, satisfying a threshold may refer to a value greater than a threshold, greater than or equal to a threshold, less than a threshold, less than or equal to a threshold, equal to a threshold, not equal to a threshold, etc., depending on the context.

[0192] It will be apparent that the systems or methods described herein may be implemented in different forms of hardware, firmware, or a combination of hardware and software. The actual specialized control hardware or software code used to implement these systems or methods is not a limitation of the various aspects. Therefore, the operation and behavior of the systems or methods are described herein without reference to specific software code - it is to be understood that software and hardware may be designed to implement the systems or methods based, at least in part, on the description herein.

[0193] Even if the specific combination of features is recorded in the claims or disclosed in the specification, these combinations are not intended to limit the disclosure of various aspects. In fact, many of these features can be combined in a manner that is not clearly recorded in the claims or not disclosed in the specification. Although each dependent claim listed below may directly depend on only one claim, the disclosure of various aspects includes each dependent claim combined with each other claim in the claim set. The phrase "at least one of" referred to as the list of items refers to any combination of these items, including a single member. For example, "at least one of a, b or c" is intended to cover: a, b, c, ab, ac, bc and abc, and any combination of the same elements with multiples (for example, aa, aaa, aab, aac, abb, acc, bb, bbb, bbc, cc and ccc or any other ordering of a, b and c).

[0194] Unless explicitly described as such, the elements, actions or instructions used herein should not be interpreted as decisive or essential. In addition, as used herein, the articles "a" and "an" are intended to include one or more entries, and can be used interchangeably with "one or more". In addition, as used herein, the terms "set" and "group" are intended to include one or more entries (e.g., related entries, unrelated entries, combinations of related entries and unrelated entries, etc.), and can be used interchangeably with "one or more". In places where only one entry is meant, the phrase "only one" or similar language is used. In addition, as used herein, the terms "has", "have", "having" etc. are intended to be open-ended terms. Further, unless otherwise expressly provided, the phrase "based on" is intended to mean "based at least in part on".

Claims

1. A method of wireless communication performed by a user equipment, comprising: comparing a bandwidth of a configured sounding reference signal (SRS) resource with a bandwidth of a physical uplink shared channel (PUSCH) resource in which a PUSCH communication is to be sent; precoding, using a first precoder, a first portion of the PUSCH communication to be sent in a portion of the PUSCH resources that overlaps with a bandwidth of the SRS resources; precoding, using a second precoder, a second portion of the PUSCH communication to be sent in a portion of the PUSCH resources that does not overlap the bandwidth of the SRS resources; as well as The precoded PUSCH communication is transmitted.

2. The method according to claim 1, wherein: The bandwidth of the SRS resources is smaller than the bandwidth of the PUSCH resources.

3. The method according to claim 1, wherein: The first precoder is associated with an SRS resource indicator indicated by signaling for scheduling the PUSCH resource.

4. The method according to claim 1, wherein: The first precoder includes a plurality of subband-specific precoders.

5. The method according to claim 1, wherein: The second precoder is a wideband precoder.

6. A user equipment, comprising: one or more memories; as well as One or more processors communicatively coupled to the one or more memories, the one or more memories and the one or more processors configured to perform the following operations: comparing a bandwidth of a configured sounding reference signal (SRS) resource with a bandwidth of a physical uplink shared channel (PUSCH) resource in which a PUSCH communication is to be sent; precoding, using a first precoder, a first portion of the PUSCH communication to be sent in a portion of the PUSCH resources that overlaps with a bandwidth of the SRS resources; precoding, using a second precoder, a second portion of the PUSCH communication to be sent in a portion of the PUSCH resources that does not overlap the bandwidth of the SRS resources; as well as The precoded PUSCH communication is transmitted.

7. The UE according to claim 6, wherein: The bandwidth of the SRS resources is smaller than the bandwidth of the PUSCH resources.

8. The UE according to claim 6, wherein: The first precoder is associated with an SRS resource indicator indicated by signaling for scheduling the PUSCH resource.

9. The UE according to claim 6, wherein: The first precoder includes a plurality of subband-specific precoders.

10. The UE according to claim 6, wherein: The second precoder is a wideband precoder.

11. An apparatus comprising: means for comparing a bandwidth of a configured sounding reference signal (SRS) resource with a bandwidth of a physical uplink shared channel (PUSCH) resource in which a PUSCH communication is to be transmitted; means for precoding, using a first precoder, a first portion of the PUSCH communication to be transmitted in a portion of the PUSCH resources overlapping a bandwidth of the SRS resources; means for precoding, using a second precoder, a second portion of the PUSCH communication to be sent in a portion of the PUSCH resources that does not overlap the bandwidth of the SRS resources; as well as Means for transmitting the precoded PUSCH communication.

12. The device according to claim 11, wherein The bandwidth of the SRS resources is smaller than the bandwidth of the PUSCH resources.

13. The device according to claim 11, wherein: The first precoder is associated with an SRS resource indicator indicated by signaling for scheduling the PUSCH resource.

14. The device according to claim 11, wherein: The first precoder includes a plurality of subband-specific precoders.

15. The device according to claim 11, wherein The second precoder is a wideband precoder.

16. A method of wireless communication performed by a network entity, comprising: receiving, using a first precoder, a first portion of a physical uplink shared channel (PUSCH) communication sent in a portion of a PUSCH resource that overlaps a bandwidth of a sounding reference signal (SRS) resource; wherein the first portion of the PUSCH communication is precoded using the first precoder; and a second portion of the PUSCH communication sent in a portion of the PUSCH resource that does not overlap with the bandwidth of the SRS resource is received using a second precoder, wherein the second part of the PUSCH communication is precoded using the second precoder, The precoding is based on a comparison, by a user equipment (UE), of a bandwidth of the SRS resource with a bandwidth of the PUSCH resource in which the PUSCH communication is to be transmitted.

17. The method according to claim 16, wherein: The bandwidth of the SRS resources is smaller than the bandwidth of the PUSCH resources.

18. The method according to claim 16, wherein: The first precoder is associated with an SRS resource indicator indicated by signaling for scheduling the PUSCH resource.

19. The method according to claim 16, wherein: The first precoder includes a plurality of subband-specific precoders.

20. The method according to claim 16, wherein: The second precoder is a wideband precoder.

21. A network entity for wireless communication, comprising: Memory; as well as One or more processors operatively coupled to the memory, the memory and the one or more processors being configured to perform the following operations: receiving, using a first precoder, a first portion of a physical uplink shared channel (PUSCH) communication sent in a portion of a PUSCH resource that overlaps a bandwidth of a sounding reference signal (SRS) resource; wherein the first part of the PUSCH communication is precoded using the first precoder; and receiving, using a second precoder, a second portion of the PUSCH communication sent in a portion of the PUSCH resources that does not overlap the bandwidth of the SRS resources, wherein the second part of the PUSCH communication is precoded using the second precoder, The precoding is based on a comparison, by a user equipment (UE), of a bandwidth of the SRS resource with a bandwidth of the PUSCH resource in which the PUSCH communication is to be transmitted.

22. The network entity according to claim 21, wherein: The bandwidth of the SRS resources is smaller than the bandwidth of the PUSCH resources.

23. The network entity according to claim 21, wherein: The first precoder is associated with an SRS resource indicator indicated by signaling for scheduling the PUSCH resource.

24. The network entity according to claim 21, wherein: The first precoder includes a plurality of subband-specific precoders.

25. The network entity according to claim 21, wherein: The second precoder is a wideband precoder.

26. An apparatus for wireless communication, comprising: means for receiving, using a first precoder, a first portion of a physical uplink shared channel (PUSCH) communication transmitted in a portion of a PUSCH resource that overlaps a bandwidth of a sounding reference signal (SRS) resource; wherein the first portion of the PUSCH communication is precoded using the first precoder; and means for receiving, using a second precoder, a second portion of the PUSCH communication sent in a portion of the PUSCH resource that does not overlap with the bandwidth of the SRS resource, wherein the second part of the PUSCH communication is precoded using the second precoder, The precoding is based on a comparison, by a user equipment (UE), of a bandwidth of the SRS resource with a bandwidth of the PUSCH resource in which the PUSCH communication is to be transmitted.

27. The device according to claim 26, wherein The bandwidth of the SRS resources is smaller than the bandwidth of the PUSCH resources.

28. The device according to claim 26, wherein The first precoder is associated with an SRS resource indicator indicated by signaling for scheduling the PUSCH resource.

29. The device according to claim 26, wherein: The first precoder includes a plurality of subband-specific precoders.

30. The device according to claim 26, wherein: The second precoder is a wideband precoder.

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