TRIGGER AND REPORTING OF CHANNEL STATE INFORMATION

Abstract

Methods related to wireless communication systems and scheduling the operation and transmission of channel state information. A user equipment (UE) receives, from a base station (BS), a channel state information (CSI) calculation request. The UE then identifies a first CSI measurement source based on the CSI calculation request. The UE determines a CSI based on the first CSI measurement source, and receives, from the BS, a CSI report transmission request associated with the first CSI measurement source. The UE additionally transmits the CSI report to the BS based on the first CSI measurement source or a different CSI measurement source. Other features are also claimed and described.

Description

Description TRIGGER AND REPORTING OF CHANNEL STATE INFORMATION Invention Engineering Field The technology described below relates generally to wireless communication systems, and more specifically to the triggering and reporting of channel state information. Certain embodiments may enable and provide techniques that allow a base station to efficiently obtain channel state information from user equipment (for example, without unnecessarily hindering the scheduling of other uplinks during the calculation of channel state information). Background of the Invention Wireless communication systems are widely used to provide various types of communication content such as voice, video, packet data, messages, broadcasts, and so on. These systems may be able to support communication with multiple users by sharing available system resources (for example, time, frequency, and power). A wireless multi-access communication system may include a number of base stations (BS), each of which simultaneously supports communication for multiple communication devices (for example, user equipment (UE)). To meet the growing demand for expanded mobile broadband connectivity, wireless communication technologies are evolving from long-term evolution (LTE) to the next generation of radio (NR) technology, which can be referred to as 5th Generation (5G). For example, NR is designed to provide lower latency, higher bandwidth or throughput, and higher reliability than LTE. NR is designed to operate across a wide range of spectrum bands, for example, from low-frequency bands below about 1 gigahertz (GHz) and mid-frequency bands from about 1 GHz to about 6 GHz, to high-frequency bands such as millimeter-wave (mmWave). NR is also designed to operate across a wide range of spectrum types, from licensed to unlicensed and shared spectrum. As diverse use cases and deployment scenarios continue to evolve in wireless communications, improvements in coding techniques can also yield benefits. Brief Description of the Invention The following summarizes some aspects of this disclosure to provide a basic understanding of the technology discussed. This summary is not an extensive review of all features of the intended disclosure and is not intended to identify key or critical elements of all aspects of the disclosure or to describe the scope of any or all aspects of the disclosure. Its primary purpose is to present some concepts of one or more aspects of the disclosure in summary form as an introduction to the more detailed explanation presented later. Some aspects of the present disclosure enable and provide mechanisms and techniques that enable a UE to determine and provide a CSI to a BS upon the BS's request. For example, a UE may provide a CSI report without the BS allocating and scheduling an uplink resource for the transmission of the CSI report when the BS requests a CSI from the UE. This allows the BS to schedule the UE to transmit other types of uplink data (e.g., ultra-reliable low latency communications (URLLC) data) after requesting a CSI, but before scheduling a CSI report. Instead of simultaneously triggering the generation of a CSI report and scheduling an uplink resource (UL) for the transmission of the CSI report in granting a UL, the BS may instead divide the process into separate steps. These steps may include triggering the generation of a CSI report by sending a CSI calculation request to the UE, and requesting the transmission of a CSI report by sending a CSI report transmission request to the UE.A CSI calculation request may cause the UE to determine the CSI, but may not schedule any UL source for CSI report transmission. The UE may store the CSI pending receipt of a CSI report transmission request. Once the CSI report transmission request is received by the UE, the UE may transmit the stored CSI report using a UL source (for example, a source in a physical uplink shared channel) specified by the BS. For example, in an aspect of the disclosure, a method of wireless communication performed by a user equipment (UE) includes receiving, from a base station (BS), a channel state information (CSI) calculation request. The method further includes identifying, based on the CSI calculation request, a first CSI measurement source. The method further includes determining a CSI based on the first CSI measurement source, and receiving, from the BS following the CSI calculation request, a CSI report transmission request associated with the first CSI measurement source. In another example, aspects may include a wireless communication method for providing channel state information. The method may include determining the channel state information based on one or more CSI measurement sources (e.g., first, second, third, etc.). The method may also include receiving or transmitting a CSI report. The receipt or transmission of a CSI report may be preceded by a CSI report request in some scenarios. The method may also additionally include receiving a CSI calculation request and / or identifying a first CSI measurement source. The first CSI measurement source may be based on the CSI calculation request. In an additional aspect of the disclosure, a wireless communication method performed by a BS includes transmitting, to a UE, a CSI calculation request. The method further includes sending, to the UE, a CSI report transmission request associated with a first CSI measurement source. The method further includes receiving, from the UE in response to the CSI report transmission request, a CSI report associated with the first CSI measurement source. In an additional aspect of the disclosure, the UE includes a processor and a transceiver. The transceiver is configured to receive, from the BS, a CSI calculation request. The processor is configured to identify, based on the CSI calculation request, a first CSI measurement source, and determine a CSI based on the first CSI measurement source. The transceiver is further configured to receive, from the BS following the CSI calculation request, a CSI report transmission request associated with the first CSI measurement source. In an additional aspect of the disclosure, the BS includes a processor and a transceiver. The transceiver is configured to transmit, to the UE, a CSI calculation request. The transceiver is further configured to send, to the UE, a CSI report transmission request associated with a first CSI measurement source, and to receive, from the UE in response to the CSI report transmission request, a CSI report associated with the first CSI measurement source. In an additional aspect of the disclosure, a non-transitory computer-readable medium has program code recorded thereon. The program code includes code for causing the UE to receive, from the BS, a request for computation. CSI. The program code further includes code to cause the UE to identify, based on the CSI calculation request, a first CSI measurement source. The program code further includes code to cause the UE to determine the CSI based on the first CSI measurement source. The program code further includes code to cause the UE to receive, from the BS following the CSI calculation request, a CSI report transmission request associated with the first CSI measurement source. In an additional aspect of the disclosure, a non-transitory computer-readable medium has program code recorded thereon. The program code includes code for causing the BS to transmit, to the UE, a CSI calculation request. The program code further includes code for causing the BS to transmit, to the UE, a CSI report transmission request associated with a first CSI measurement source. The program code further includes code for causing the BS to receive, from the UE in response to the CSI report transmission request, a CSI report associated with the first CSI measurement source. In an additional disclosure aspect, the UE includes means for receiving, from the BS, a CSI calculation request. The UE further includes means for identifying, based on the CSI calculation request, a first CSI measurement source. The UE further includes means for determining a CSI based on the first CSI measurement source. The UE further includes means for receiving, from the BS following the CSI calculation request, a request for transmission of a CSI report associated with the first CSI measurement source. In an additional disclosure aspect, the BS includes means for transmitting, to the UE, a CSI calculation request. The BS further includes means for transmitting, to the UE, a CSI report transmission request associated with a first CSI measurement source. The BS further includes means for receiving, from the UE in response to the CSI report transmission request, a CSI report associated with the first CSI measurement source. Other aspects, features, and embodiments will become apparent to those having ordinary skill in the art, after reviewing the following descriptions of specific and exemplary embodiments in conjunction with the accompanying drawings. While features may be discussed relative to the particular embodiments and drawings below, all embodiments may include one or more of the advantageous features discussed herein. In other words, while one or more embodiments may be discussed as having a particular advantageous feature, one or more of those features may also be used in accordance with various embodiments discussed herein. Similarly, while exemplary embodiments may be discussed below as embodiments of devices, systems, or methods, it should be understood that such exemplary embodiments may be implemented in a variety of devices, systems, and methods. Short Description of Image Figure 1 illustrates a wireless communications network according to some aspects of the present disclosure. Figure 2A illustrates a channel state information (CSI) request and resource allocation method according to some aspects of the present disclosure. Figure 2B illustrates the method of allocating resources according to several aspects of this disclosure. Figure 3 illustrates the CSI request and resource allocation method according to several aspects of this disclosure. Figure 4 is an example of a sequence diagram illustrating the sequence of communications according to several aspects of this disclosure. Figure 5 is a flow diagram of wireless communications according to some aspects of the present disclosure. Figure 6 is a block diagram of an equivalent base station (BS) according to some aspects of the present disclosure. Figure 7 is a block diagram of an equivalent user equipment (UE) according to some aspects of the present disclosure. Figure 8 is a flow diagram of wireless communications according to some aspects of the present disclosure. Figure 9 is a flow diagram of wireless communications according to some aspects of the present disclosure. Complete Description of the Invention The detailed descriptions set forth below, in conjunction with the accompanying drawings, are intended as descriptions of various configurations and are not intended to represent the only configurations in which the concepts described herein can be implemented. The detailed descriptions include specific details for the purpose of providing a comprehensive understanding of the various concepts. However, it will be apparent to those skilled in the art that these concepts can be implemented without these specific details. In some cases, well-known structures and components are shown in block diagram form to avoid obscuring the concepts. A base station (BS) may request channel state information (CSI) from the UE to determine the current channel state for communication between the BS and the UE based on a CSI measurement source. The CSI measurement source may be, for example, a non-zero power channel state information reference signal (NZP CSI-RS) and / or a channel state information interference measurement source (CSI-IM). The BS may transmit one physical downlink control channel (PDCCH) downlink control information (DCI) to request the UE to measure and / or collect CSI from the corresponding CSI measurement source and schedule an uplink source for the UE to transmit the resulting CSI report. The uplink scheduling is typically pre-ordered (sent earlier than the actual scheduled time).Since the CSI calculation at the UE may take a considerable amount of time, the BS may take into account the CSI calculation time and transmit the DCI (including the CSI measurement and reporting trigger) at a time even earlier than the scheduled source of the CSI report, for example, up to about 11 slots in advance depending on the subcarrier distance. Thus, there may be a very long duration between the time the CSI request is sent to the UE and the scheduled source of the CSI report. Since uplink scheduling is expected to be sequential, the BS may not schedule the UE with any other uplink transmissions between the time the UE receives the CSI request and the time the UE transmits the CSI report. This effectively gives CSI data a higher priority than other data types, making highly reliable low latency communication (URLLC) difficult for the UE. The present disclosure generally relates to wireless communication systems, also referred to as wireless communication networks. In various embodiments, techniques and apparatus may be used for wireless communication networks such as code division multiple access (CDMA) networks, time division multiple access (TDMA) networks, frequency division multiple access (FDMA) networks, orthogonal FDMA (OFDMA) networks, single carrier FDMA (SC-FDMA) networks, LTE networks, Global System for Mobile Communications (GSM) networks, 5th Generation (5G) or new radio (NR) networks, as well as other communication networks. As described herein, the terms network and system may be used interchangeably. OFDMA networks can implement radio technologies such as Evolved Ultra-Range Transmitter (E-UTRA), Institute of Electrical and Electronics Engineers (IEEE) 802.11, IEEE 802.16, IEEE 802.20, flash-OFDM, and similar standards. Ultra-Range Transmitter (UTRA), E-UTRA, and GSM are all part of the Universal Mobile Telecommunications System (UMTS). Specifically, Long Term Evolution (LTE) is a release of UMTS that uses E-UTRA. Ultra-Range Transmitter (UTRA), E-UTRA, GSM, UMTS, and LTE are described in documents provided by the 3rd Generation Partnership Project (3GPP), and cdma2000 is described in documents from the 3rd Generation Partnership Project (3GPP2). Various radio technologies and standards are known or under development. For example, the 3rd Generation Partnership Project (3GPP) is a collaboration between a group of telecommunications associations aimed at defining globally applicable third-generation (3G) mobile phone specifications.3GPP long term evolution (LTE) is a 3GPP project aimed at improving the UMTS mobile standard. 3GPP can define specifications for the next generation of mobile networks, mobile systems, and mobile devices. This disclosure relates to the evolution of wireless technologies from LTE, 4G, 5G, NR, and beyond with shared access to wireless spectrum between networks using a set of new and different radio access technologies or radio air interfaces. Specifically, 5G networks consider diverse deployments, diverse spectrum, and a wide variety of services and devices that can be implemented using an OFDM-based unified air interface. To achieve these goals, further enhancements to LTE and LTE-A are being considered in addition to the development of new radio technologies for 5G NR networks.5G NR will be able to scale to provide coverage (1) to the massive Internet of Things (IoT) with very high density (e.g., ~1M nodes / km 2), very low complexity (e.g., ~10s of bits / s), very low energy (e.g., ~10+ years of battery life), and deep coverage with the ability to reach challenging locations; (2) encompassing mission-critical control with strong security to protect sensitive personal, financial, or confidential information, very high reliability (e.g., ~99.9999% reliability), very low latency (e.g., ~1 ms), and users with a wide range of mobility or lack thereof; and (3) with enhanced mobile broadband including very high capacity (e.g., ~10 Tbps / km 2), extreme data rates (e.g., multi-Gbps speeds, 100+ Mbps user experience levels), and deep awareness with advanced discovery and optimization. 5G NR communication systems can be implemented to use OFDM-based waveforms optimized with scalable numerology and transmission time interval (TTI). Additional features may also include having a flexible common framework for services and efficient multiplexing features with dynamic low-latency time-division duplex (TDD) / frequency-division duplex (FDD) designs; and with advanced wireless technologies, such as massive multiple input, multiple output (MIMO), robust millimeter wave (mmWave) transmission, advanced channel coding, and device-centric mobility. Numerological scalability in 5G NR, with subcarrier spacing (SCS), can handle the operation of diverse services efficiently across diverse spectrum and deployments. For example, in various outdoor and macro coverage deployments with FDD / TDD implementations less than 3GHz, subcarrier spacing can occur with 15 kHz, for example, over 5, 10, 20 kHz. MHz, and similar bandwidth (BW). For various small cell and other outdoor coverage implementations of TDD greater than 3 GHz, subcarrier spacing may occur with 30 kHz over 80 / 100 MHz BW. For various other indoor broadband implementations, using TDD over the unlicensed portion of the 5 GHz band, subcarrier spacing may occur with 60 kHz at 160 MHz BW. Finally, for various applications transmitting with mmWave components at 28 GHz TDD, subcarrier spacing can occur with 120 kHz at 500 MHz BW. The scalable numerology of 5G NR facilitates scalable TTIs for varying latency and quality of service (QoS) requirements. For example, shorter TTIs can be used for low latency and high reliability, while longer TTIs can be used for higher spectral efficiency. Efficient multiplexing of long and short TTIs allows transmission to start at symbol boundaries. 5G NR also considers the design of self-integrated subframes with UL / downlink scheduling information, data, and acknowledgments in the same subframe. Self-integrated subframes support unlicensed or contention-based shared spectrum communications, adaptive UL / downlinks that can be flexibly configured on a per-cell basis to dynamically switch between UL and downlink to meet current traffic needs. Various other aspects and features of the disclosure are further explained below. It should be clear that the teachings herein may be embodied in various forms and that any structure, function, or both disclosed herein are merely representative and not limiting. Based on the teachings herein, one of ordinary skill in the art should understand that any aspect disclosed herein may be implemented independently of other aspects and that two or more of these aspects may be combined in various ways. For example, an apparatus may be implemented or a method may be practiced using any number of aspects set forth herein. In addition, such apparatus may be implemented or such method may be practiced using other structures, functions, or structures and functions in addition to or in addition to one or more of the aspects set forth herein.For example, the method may be implemented as part of a system, device, apparatus, and / or as instructions stored on a computer-readable medium for execution on a processor or computer. Additionally, the aspect may comprise at least one claim element. A base station (BS) in 5G NR may request channel state information from a user equipment (UE). The BS may use the CSI to determine the operating conditions or channel state to aid communication between the BS and the UE and / or to obtain interference measurements. The BS may request that the UE perform channel estimation and / or interference measurements by including an aperiodic channel state information (ACSI) trigger as part of the uplink grant (UL) to the UE. The UL grant with the trigger may be sent in the physical downlink control channel (PDCCH) transmission, and the grant may include a UL scheduling offset indicating the number of slots between when the grant is sent and when the UE is scheduled to transmit the CSI report in the physical uplink shared channel (PUSCH). The UL grant may be accompanied by the presence of a channel state information reference signal (CSI-RS) and / or the presence of a channel state information interference measurement source (CSI-IM).When a UL grant includes an A-CSI trigger (for example, indicated by the CSI trigger field having a non-zero value), the scheduling offset is larger than for UL grants not associated with an A-CSI trigger, to account for the time required for the UE to prepare the requested CSI report. Currently, out-of-order PUSCH transmissions are prohibited, so the BS cannot schedule the UE to transmit any PUSCH data during the scheduling offset (i.e., before the UE is scheduled to transmit the requested CSI report). In addition to the resulting inefficiency, CSI data is effectively given higher priority than other uplink data types, which may be problematic for highly reliable low latency communication (URLLC). Thus, the aspects and embodiments described herein provide techniques that enable and enable the BS to request CSI without the BS allocating and scheduling uplink resources for CSI reports when requesting CSI. This allows the BS to schedule the UE to transmit other uplink data types (e.g., URLLC data) after requesting the CSI request, but before scheduling the CSI, fulfilling the sequential transmission scheduling of PUSCH reports. This disclosure provides techniques for a UE to determine and provide a CSI to a BS. In some scenarios, the UE may provide a CSI to the BS upon the BS's request. The UE's provision of a CSI may occur without the BS reserving an uplink resource for the CSI report when requesting the CSI. This allows the UE to transmit other types of uplink data (for example, URLLC data) after receiving the request for the CSI, but before transmitting the CSI report. Instead of simultaneously triggering the generation of a CSI report and scheduling an UL resource for the transmission of the CSI report in the UL grant, the BS may instead divide the process into separate steps. These steps may include triggering the generation of a CSI report by sending a CSI calculation request to the UE, and requesting the transmission of a CSI report by sending a CSI report transmission request to the UE.The BS may transmit a CSI count request as a downlink control information (DCI) message on the PDCCH (referred to herein as a count-only DCI). In addition or alternatively, the BS may, at a later time, transmit a CSI report transmission request as part of a DCI message on the PDCCH (referred to herein as a report-only DCI). A count-only DCI may trigger the generation of a CSI report by the UE. However, in some cases, it will not schedule a UL source for CSI report transmission. The UE may generate a CSI report and store it, pending the receipt of a report-only DCI. Once the report-only DCI indicating which CSI report to transmit is received by the UE, the UE may transmit the stored CSI report using the UL source (for example, a source in the physical uplink shared channel (PUSCH)) specified in the report-only DCI.In the example, a report-only DCI includes a CSI request column containing values ​​mapped to CSI trigger states. The CSI trigger state may be associated with one or more CSI report configurations. Each CSI report configuration can reference the CSI measurement source that the BS requests for the report. For example, according to an aspect of the present disclosure, the BS may request that the UE calculate the CSI by transmitting a first CSI calculation request to the UE (for example, as a DCI message in the PDCCH). The first CSI calculation request may indicate one or more CSI measurement sources that the UE may use to measure the CSI, but may not indicate any sources for the UE to transmit CSI reports from. Based on the first CSI calculation request, the UE may then identify a CSI measurement source, which may be, for example, a channel state information reference signal (CSI-RS) source and / or a channel state information interference measurement (CSI-IM) source. Based on the CSI measurement source, the UE may perform channel estimation and / or interference measurements, but rather than directly transmitting the results to the BS, the UE may store the resulting CSI in memory within the UE.During the CSI calculation time, the BS may schedule the UE for other types of uplink data (for example, URLLC data) by transmitting a scheduling grant to the UE and the UE may transmit uplink data based on the scheduling grant. At a later time, the BS may send a first CSI report transmission request to the UE (for example, as a DCI message on the PDDCH), requesting the UE to transmit a report including the CSI calculated in response to the first CSI calculation request. The CSI report transmission request may indicate which uplink source (for example, the PUSCH source) the UE should use to transmit the report. In some aspects, the UE may store multiple CSIs in its memory corresponding to different CSI calculation requests and CSI measurement sources. For example, some time after transmitting the first CSI calculation request, the BS may transmit a second CSI calculation request and indicate a second CSI measurement source corresponding to the second CSI calculation request. The UE may perform channel and / or interference measurements based on the second CSI measurement source and store the resulting CSI in its memory without deleting the CSI corresponding to the first CSI calculation request. The UE may store and maintain multiple CSIs in its memory, which may be useful, for example, if the interval between the CSI calculation request and the CSI report transmission request is too short for the UE to determine the CSI. In such circumstances, it may be appropriate for the UE to transmit the stored older CSI.In some aspects, there may be a limit to the number of CSIs that can be stored by the UE, and the UE may delete stored CSIs or not store newly computed CSIs if the number of CSIs in memory exceeds the limit. In some aspects, the UE may use a timer to determine which, if any, stored CSIs to send to the BS in response to a CSI transmission request. The timer mechanism may assist the UE in responding to a CSI report transmission request that arrives too early (for example, before the UE can determine the CSI) or too late (for example, when the CSI data is stale or expired). Aspects may include further time-related features. For example, the UE may start (or reset) a timer after some period (or duration) has elapsed from the end time of the CSI measurement source (for example, the end of the last symbol on the CSI measurement source). The period may be (approximately) the minimum distance between the end time of the CSI measurement source and the time when the UE can determine the CSI. The timer duration may be preconfigured (for example, to a value defined in the 3rd Generation Partnership Project (3GPP) specifications). Additionally or alternatively, the timer value may be semi-statically configured by the BS (for example, via RRC signaling) or dynamically indicated by the BS (for example, as part of a CSI calculation request, or via a MAC CE).The timer duration may be based on the information (for example, the content of the CSI report) that the UE will enter into the CSI report (for example, the timer duration may be greater when the UE enters more information or more complex information in the CSI report). The timer duration can also be based on the codebook type, number of antenna ports, channel quality indicator (CQI) type, and / or precoding matrix indicator (PMI) type associated with the CSI report. In general, the content of a CSI report can vary depending on the codebook type used for CSI calculation, the number of antenna ports associated with the CSI measurement source, and / or the type of CQI and / or PMI to be reported. In other words, the CSI calculation time can vary depending on the content of the CSI report. The time period the timer runs may correspond to the time period the current CSI report should be sent to The BS responds to a CSI report transmission request. For example, if a CSI report transmission request arrives while a timer is running, the UE may transmit the most recently computed CSI in the CSI report. However, if the UE receives a CSI report transmission request before the timer starts, it may not have been able to complete the requested channel estimation and / or interference measurements. If a CSI report transmission request is received after the timer has expired, this may indicate that the most recently computed CSI data is now stale. In either case—when a CSI transmission request is received before the timer starts or after the timer has expired—the UE may transmit a CSI that may not be current (for example, the most recently stored CSI—now stale, or a previously stored CSI).and based on older CSI calculation requests and corresponding CSI measurement sources) or placeholder data (without useful CSI) in the CSI report. Transmission of stale or useless CSI is to satisfy the CSI report transmission request as the UE will transmit as scheduled by the BS. Transmitting older CSI data or placeholders may be appropriate when, for example, the transmission in which the CSI report transmission request arrives also includes an allowance for transmitting uplink-sharing channel (UL-SCH) data or a hybrid auto-repeat request (HARQ). In this case, the BS may determine that the CSI report is not based on the most recent CSI count request. Because the BS knows the timeline of the CSI count request and the CSI report transmission request, it can determine whether the CSI report is valid. In general, the BS may not schedule the UE such that the CSI report transmission request falls outside the period when the UE's report timer is running. Alternately, the UE may ignore the CSI report transmission request altogether (i.e., refrain from transmitting the CSI report), for example, if the CSI transmit request only includes an allowance for CSI report transmission.In some aspects, the UE may delete a stored CSI from memory based on an expired timer. In some aspects, the resource occupancy reporting rules may be updated to reflect aspects of the current disclosure. 5G NR provides rules for the UE to determine resources (e.g., the maximum number of central processing units (CPUs) and / or the maximum number of simultaneous memory resources) to implement a two-step CSI trigger (with separate CSI count requests and CSI report requests transmitted) and to report its capabilities in relation to the two-step CSI trigger. In accordance with the current disclosure, CPU resources are occupied from the end of the last symbol of the PDCCH (or control resource set (CORESET)) on which a CSI count request (e.g., DCI only count) is performed, for a duration of Z symbols, where Z is the minimum distance between the time when the CSI count request is transmitted and the time when the UE can provide a CSI report. In other words, Z symbols are the amount of time to complete the CSI count.The Z value may vary depending on the UE's capabilities. The UE may determine the Z value based on CPU resource usage rules and report the Z value to the BS. For example, a UE with high processing capability may report a smaller Z value than a UE with low processing capability. Memory resources may be occupied by CSI operations from the end of the last symbol of the PDCCH (or control resource set (CORESET)) for which a CSI calculation request (for example, a DCI calculation only) is performed, for the duration of Z + Texp of the symbol, where Z is defined as above in terms of CPU usage and Texp is the duration of the window during which the UE waits for a CSI report transmission request (i.e., the duration of the timer discussed above, during which the UE can provide the most recently calculated CSI to the BS).The memory resources occupied for CSI operations become free at the end of the window, or after the UE transmits a CSI report to the BS (in response to receiving a CSI request report sent during the window). Aspects of the present disclosure can provide multiple benefits. For example, aspects of the present disclosure allow the BS to schedule the UE to send uplink data within the time period between receiving a CSI request and transmitting the request result. This can occur, for example, by decoupling the A-CSI triggering mechanism from the allocation of UL resources for reporting CSI. This allows the UE to communicate URLLC data better (for example, with lower latency), as CSI data is no longer de-facto prioritized by locking the UE to determine and transmit CSI without interruption. While aspects and embodiments are described in this application with illustrations of several examples, those skilled in the art will appreciate that additional implementations and use cases may occur in many different settings and scenarios. The innovations described herein may be implemented across different types of platforms, devices, systems, form factors, sizes, and packaging arrangements. For example, embodiments and / or uses may occur through embodiments of integrated chips and other non-module component-based devices (e.g., end-user devices, vehicles, communications devices, computing devices, industrial equipment, retail / purchasing devices, medical devices, AI-enabled devices, and so forth). While some examples may or may not be specifically directed to use cases or applications, a variety of implementations of the described innovations may occur.Implementations may range across the spectrum from chip-level or modular components to non-modular, non-chip-level implementations and further to aggregated, distributed, or OEM devices or systems incorporating one or more aspects of the described innovations. In some practical settings, devices incorporating the described aspects and features may also include additional components and features for the implementation and practice of the claimed and described embodiments. For example, wireless signal transmission and reception may necessarily include a number of components for both analog and digital purposes (e.g., hardware components include antennas, RF circuits, power amplifiers, modulators, buffers, processors, interleavers, adders / summers, and so forth).It is intended that the innovations described herein can be implemented in a variety of devices, chip-level components, systems, distributed arrangements, end-user devices, and so on of various sizes, shapes, and constitutions. Figure 1 illustrates a wireless communication network 100 according to some aspects of the present disclosure. The network 100 may be a 5G network. The network 100 includes a plurality of base stations (BSs) 105 (individually labeled as 105a, 105b, 105c, 105d, 105e, and 105f) and other network entities. The BSs 105 may be stations that communicate with the UE 115 and may also be referred to as evolved node Bs (eNBs), next-generation eNBs (gNBs), access points, and the like. Each BS 105 may provide communication coverage for a specific geographic area. In 3GPP, the term cell may refer to a specific geographic coverage area of ​​the BS 105 and / or a BS subsystem serving the coverage area, depending on the context in which the term is used. BS 105 may provide communications coverage for macro cells or small cells, such as pico cells or femto cells, and / or other cell types. Macro cells generally cover a relatively large geographical area (for example, a radius of several kilometers) and allow unrestricted access by UEs with a service subscription with a network provider. Small cells, such as pico cells, will generally cover a relatively smaller geographical area and allow unrestricted access by UEs with a service subscription with a network provider. Small cells, such as femto cells, will generally also cover a relatively small geographical area (for example, a home) and, in addition to unrestricted access, may also provide restricted access by UEs associated with the femto cell (for example, UEs in a closed subscriber group (CSG), UEs for users in a home, and the like). The BS for macro cells may be referred to as a macro BS.A BS for small cells may be referred to as a small cell BS, pico BS, femto BS, or home BS. In the example shown in Figure 1, BSs 105d and 105e may be regular macro BSs, while BSs 105a-105c may be macro BSs enabled with one of three-dimensional (3D), full-dimensional (FD), or massive MIMO. BSs 105a-105c may leverage higher-dimensional MIMO capabilities to exploit 3D beamforming in elevation and azimuth beamforming to increase coverage and capacity. BS 105f may be a small cell BS that may be a home node or a portable access point. BS 105 may support one or multiple cells (for example, two, three, four, and the like). Network 100 may support synchronous or asynchronous operation. For synchronous operation, base stations may have similar frame times, and transmissions from different base stations may be approximately synchronized in time. For asynchronous operation, base stations may have different frame times, and transmissions from different base stations may be misaligned in time. The UEs 115 may be distributed throughout the wireless network 100, and each UE 115 may be stationary or mobile. The UEs may take various shapes and various form factors. The UEs 115 may also be referred to as terminals, mobile stations, subscriber units, stations, or the like. The UEs 115 may be cellular telephones, personal digital assistants (PDAs), wireless modems, wireless communication devices, handheld devices, tablet computers, laptop computers, cordless telephones, wireless local loop stations (WLLs), or the like. In one aspect, the UEs 115 may be devices that include a Universal Integrated Circuit Card (UICC). In another aspect, the UEs may be devices that do not include a UICC. In some aspects, the UEs 115 that do not include a UICC may also be referred to as IoT devices or mobile internet of everything (IoE) devices. UEs 115a115d are examples of mobile smartphone-type devices that access the network 100.UE 115 may also be a machine specifically configured for connected communications, including machine-type communications (MTC), enhanced MTC (eMTC), narrowband IoT (NB-IoT) and the like. UE 115e-115h are examples of various machines configured for communications accessing network 100. UE 115i-115k are examples of vehicles equipped with wireless communications devices configured for communications accessing network 100. UE 115 may be able to communicate with any type of BS, whether a macro BS, a small cell, or the like. In Figure 1, the lightning bolt (for example, a communication link) indicates wireless transmission between UE 115 and a serving BS 105, which is a BS intended to serve UE 115 on the downlink (DL) and / or uplink (UL), desired transmission between BS 105, backhaul transmission between BSs, or sidelink transmission between UE 115. In operation, the BS 105a-105c can serve UEs 115a and 115b using 3D beamforming and coordinated spatial techniques, such as coordinated multipoint (CoMP) or multiconnectivity. The macro BS 105d can perform backhaul communications with BSs 105a-105c, as well as the small cell, BS 105f. The macro BS 105d can also transmit multicast services subscribed to and received by UEs 115c and 115d. Such multicast services may include mobile television or video streaming, or may include other services to provide community information, such as weather warnings or emergencies, such as Amber alerts or Grey alerts. The BS 105 may also communicate with the core network. The core network may provide user authentication, access authorization, tracking, Internet Protocol (IP) connectivity, and other access, routing, or mobility functions. At least some BSs 105 (for example, which may be instances of gNBs or access node controllers (ANCs)) may interact with the core network via backhaul links (for example, NG-C, NG-U, and so on) and may perform radio configuration and scheduling for communication with the UE 115. In various examples, the BSs 105 may communicate, either directly or indirectly (for example, via the core network), with each other via backhaul links (for example, X1, X2, and so on), which may be wired or wireless communication links. Network 100 may also support mission-critical communications with highly reliable and redundant links for mission-critical devices, such as UE 115e, which may be drones. Redundant communication links with UE 115e may include links from macro BSs 105d and 105e, as well as links from small cell BSs 105f. Other machine-type devices, such as UE 115f (e.g., thermometers), UE 115g (e.g., smart meters), and UE 115h (e.g., wearables) may communicate over network 100 either directly with a BS, such as small cell BS 105f, and Macro BS 105e, or in a multi-step size configuration by communicating with other user devices that relay their information to the network, such as UE 115f communicating temperature measurement information to a smart meter, UE 115g, which is then reported to the network via small cell BS 105f. Network 100 may also provide additional network efficiency through dynamic low-latency TDD / FDD communications, such as V2V, V2X, C-V2X communications between UE 115i, 115j, or 115k and another UE 115, and / or vehicle-to-infrastructure (V2I) communications between UE 115i, 115j, or 115k and BS 105. In some implementations, the network 100 uses OFDM-based waveforms for communication. OFDM-based systems can partition the BW system into multiple (K) orthogonal subcarriers, also commonly referred to as subcarriers, tones, bins, or the like. Each subcarrier can be modulated with data. In some cases, the subcarrier spacing between adjacent subcarriers can be fixed, and the total number of subcarriers (K) may depend on the BW system. The BW system can also be partitioned into subbands. In other cases, the subcarrier spacing and / or TTI duration can be scalable. In some aspects, the BS 105 may assign or schedule transmission resources (e.g., in the form of time-frequency resource blocks (RBs)) for downlink (DL) and uplink (UL) transmissions in the network 100. DL refers to the transmission direction from the BS 105 to the UE 115, while UL refers to the transmission direction from the UE 115 to the BS 105. The communication may be in the form of radio frames. The radio frames may be divided into a number of sub-frames or slots, for example, approximately 10. Each slot may be further divided into mini-slots. In FDD mode, UL and DL transmissions may simultaneously occur in different frequency bands. For example, each subframe includes a UL subframe in the UL frequency band and a DL subframe in the DL frequency band. In TDD mode, UL and DL transmissions occur at different time periods using the same frequency band.For example, a subset of subframes (for example, DL subframes) in a radio frame can be used for DL ​​transmissions and another subset of subframes (for example, UL subframes) in a radio frame can be used for UL transmissions. DL subframes and UL subframes can be further divided into regions. For example, each DL or UL subframe may have predefined regions for the transmission of reference signals, control information, and data. Reference signals are predefined signals that facilitate communication between the BS 105 and the UE 115. For example, the reference signals may have a specific pilot pattern or structure, where the pilot tones may span the entire operational BW or frequency band, each positioned at a predetermined time and a predetermined frequency. For example, the BS 105 may transmit a cell-specific reference signal (CRS) and / or a channel state information reference signal (CSI-RS) to enable the UE 115 to estimate a DL channel. Similarly, the UE 115 may transmit a beeping reference signal (SRS) to enable the BS 105 to estimate a UL channel.Control information may include source assignment and protocol control. Data may include protocol data and / or operational data. In some aspects, the BS 105 and UE 115 may communicate using self-contained subframes. The self-contained subframes may include a portion for DL ​​communication and a portion for UL communication. The self-contained subframes may be DL-centric or UL-centric. The DL-centric subframes may include a longer duration for DL ​​communication than for UL communication. The UL-centric subframes may include a longer duration for UL communication than for UL communication. In some aspects, the network 100 may be an NR network deployed over licensed spectrum. The BS 105 may transmit synchronization signals (e.g., including a primary synchronization signal (PSS) and a secondary synchronization signal (SSS)) within the network 100 to facilitate synchronization. The BS 105 may broadcast system information associated with the network 100 (e.g., including a master information block (MIB), remaining system information (RMSI), and other system information (OSI)) to facilitate initial network access. In some cases, the BSs 105 may broadcast the PSS, SSS, and / or MIB in the form of a synchronization signal block (SSB) over the physical broadcast channel (PBCH) and may broadcast the RMSI and / or OSI over the physical downlink shared channel (PDSCH). In some aspects, a UE 115 attempting to access a network 100 may perform an initial cell search by detecting the PSS from the BS 105. The PSS may enable period time synchronization and may indicate a physical layer identity value. The UE 115 may then receive the SSS. The SSS may enable radio frame synchronization and may provide a cell identity value, which may be combined with the physical layer identity value to identify the cell. The PSS and SSS may be located in the middle of the carrier or on corresponding frequencies within the carrier. After receiving the PSS and SSS, the UE 115 may receive the MIB. The MIB may include system information for initial network access and scheduling information for the RMSI and / or OSI. After decoding the MIB, the UE 115 may receive the RMSI and / or OSI. The RMSI and / or OSI may include radio source control (RRC) information related to random access channel (RACH) procedures, paging, control source set (CORESET) for monitoring the physical downlink control channel (PDCCH), physical UL control channel (PUCCH), physical UL shared channel (PUSCH), power control, and SRS. After obtaining the MIB, RMSI, and / or OSI, the UE 115 may perform a random access procedure to establish a connection with the BS 105. The random access procedure (or RACH procedure) may be a single-step or a multiple-step process. In some examples, the random access procedure may be a four-step random access procedure. For example, the UE 115 may transmit a random access preamble and the BS 105 may respond with a random access response. The random access response (RAR) may include a random access preamble identifier (ID) detected corresponding to the random access preamble, forward timing information (TA), a UL grant, a temporary cell radio network identifier (C-RNTI), and / or a fallback indicator. After receiving the random access response, the UE 115 may transmit a connection request to the BS 105 and the BS 105 may respond with a connection response. The connection response may indicate the resolution of the contention.In some examples, the random access preamble, RAR, connection request, and connection response may be referred to as message 1 (MSG1), message 2 (MSG2), message 3 (MSG3), and message 4 (MSG4), respectively. In some examples, the random access procedure may be a two-step random access procedure, wherein the UE 115 may transmit the random access preamble and the connection request in one transmission and the BS 105 may respond by transmitting the random access response and the connection response in one transmission. After establishing a connection, the UE 115 and the BS 105 can enter the normal operation phase, where operational data can be exchanged. For example, the BS 105 can schedule the UE 115 for UL and / or DL ​​communication. The BS 105 can send UL and / or DL ​​scheduling grants to the UE 115 over the PDCCH. The scheduling grants can be transmitted in the form of DL control information (DCI). The BS 105 can send DL communication signals (for example, carrying data) to the UE 115 over the PDSCH according to the DL scheduling grants. The UE 115 can send communication signals UL to BS 105 via PUSCH and / or PUCCH according to UL scheduling provision. In some aspects, the network 100 may operate over a BW system or a BW component operator (CC). The network 100 may partition the BW system into multiple BWPs (e.g., portions). The BS 105 may dynamically assign the UE 115 to operate on a particular BWP (e.g., a particular portion of the BW system). The assigned BWP may be referred to as the active BWP. The UE 115 may monitor the active BWP for signaling information from the BS 105. The BS 105 may schedule the UE 115 for UL or DL ​​communication on the active BWP. In some aspects, the BS 105 may assign a pair of BWPs within the CC to the UE 115 for UL and DL communication. For example, the BWP pair may include one BWP for UL communication and one BWP for DL ​​communication. In some aspects, the BS 105 may request that the UE 115 calculate the CSI by transmitting a CSI calculation request to the UE 115 (for example, as a DCI message on the PDDCH). The CSI calculation request may indicate the presence of at least one CSI measurement source from which the UE 115 will perform CSI measurements, but may not indicate any source for the UE 115 to transmit the CSI report. The UE 115 may then identify, based on the CSI calculation request, the source of the CSI measurements. Based on the source of the CSI measurements, the UE 115 may perform channel measurements and / or interference measurements, but instead of immediately transmitting the results to the BS 105, the UE 115 may store the CSI results in memory within the UE 115. Thereafter, the UE 115 may continue to transmit other types of uplink data (for example, URLLC data). For example, the BS 105 may transmit a scheduling grant to the UE 115 and the UE 115 may transmit uplink data based on the scheduling grant.At a later time, the BS 105 may send a CSI report transmission request to the UE 115 (for example, as a DCI message on the PDDCH), indicating that the UE 115 should now send a report including a CSI calculated based on the measurement source CSI. The CSI report transmission request may indicate which uplink source (for example, a PUSCH source) the UE 115 should use when sending the report. In addition, the CSI report transmission request may include a CSI request field including a value that maps to a CSI trigger state. The CSI trigger state may be associated with one or more CSI report configurations. Each CSI report configuration may reference a CSI measurement source that the BS requests the report from. For example, the CSI report transmission request may reference the same CSI measurement source as the CSI calculation request.Therefore, the UE 115 may transmit a CSI report based on the CSI measurement source indicated by the CSI report transmission request. Depending on the time when the CSI report transmission request is received, the UE 115 may transmit a CSI report based on the CSI measurement source indicated by the CSI report transmission request, or based on a previous CSI measurement source, depending on when the UE 115 received the CSI report transmission request, as discussed in connection with Figures 4-5, 7, and 8. In some cases, the UE 115 may ignore the CSI report transmission request and refrain from transmitting the CSI report altogether (for example, if the CSI report transmission request does not arrive while the timer is running, as described above). Figure 2A illustrates a CSI request and resource allocation method 200A according to some aspects of the present disclosure. When requesting a CSI from UE 115 using an aperiodic CSI request, BS 105 may include an A-CSI trigger 202 (for example, as part of a DCI) in the PDCCH transmission during S0 slot 212. In an example, the DCI may include a CSI request field including values ​​that map to CSI trigger states. The CSI trigger states may be associated with one or more CSI report configurations. Each CSI report configuration may reference a CSI measurement source that BS 105 requests for the CSI report. The uplink grant may be accompanied by an ACSI trigger 202, which indicates which UL source 206 the UE 115 uses in the PUSCH when transmitting the CSI report to the BS 105. The BS may indicate that the reported CSI may be based on a CSI measurement source 204 (for example, an NZP CSI-RS source and / or a CSI-IM source) by the A-CSI trigger 202.A CSI measurement source is a set of source elements (including a plurality of subcarriers in frequency and a number of symbols in time) from which the UE 115 can perform measurements. When the CSI measurement source 204 is a CSI-RS or NZP CSI-RS source, the BS 105 can transmit CSI-RS in the CSI measurement source 204 for the UE 115 to determine channel response. When the CSI measurement source 204 is a CSI-IM source, the UE 115 can measure interference from the CSI measurement source 204. The BS can indicate (for example, as part of the uplink provisioning) a scheduling offset 208, which can be referred to as Y, indicating the delay between the time the A-CSI trigger is transmitted and the time the CSI report must be transmitted in the PUSCH. The BS 105 may have to pre-reserve a number of slots of UL 206 resources in advance (for example, before transmitting an A-CSI 202 trigger in S0 slot 212) and the BS 105 is expected to perform sequential uplink scheduling.As a result, from the end time of the CSI measurement source 204 until the time the UE 115 transmits the CSI report on the UL source 206, the BS 105 may not schedule the UE 115 to transmit any additional UL data during the gap time. The gap between the CSI measurement source 204 and the CSI report transmitted on the UL source 206 (for example, a PUSCH transmission) may be referred to as Y'. For example, the BS 105 may not schedule the UE 115 to transmit additional UL data for the remainder of the S0 slot 212, or the S1 slot 214, the S2 slot 216, the S3 slot 218, or the S4 slot 220. Thus, the UE 115 may not transmit other types of UL data until after it has transmitted the CSI report during the S5 slot 222. As a result, the CSI data is effectively given higher priority than other types of data, which may be problematic for the UE 115 involved in URLLC communications. Figure 2B illustrates a resource allocation method 200B according to some aspects of the present disclosure. In contrast to Figure 2A, a UL grant 250—without an A-CSI trigger—is included in the PDCCH transmission. Because the UE 115 is not used to determine the CSI, the UE 115 can transmit data using the UL source 252 (for example, on a PUSCH) much sooner after the UL grant 250 when compared to method 200A. Here, the UE 115 can transmit data on the UL source 252 after a period N 2, which is defined as the gap 254 between the end of the PDCCH transmission (i.e., the UL grant 250) and the beginning of the scheduled UL source 252 (for example, the PUSCH). In this example, the UL grant 250 is received in the S0 slot 260, and the UE can transmit UL data in the next slot, the S1 slot 262. As illustrated in Figures 2A and 2B, the scheduling offset between the time a UL grant is transmitted and the time the UE 115 can transmit data on the resource indicated by the UL grant depends on whether an A-CSI trigger is included along with the UL grant. If an A-CSI trigger 202 is included as in Figure 2A, the minimum scheduling offset is Z symbols, which depends on the SCS used and the type of CSI to be defined (for example, the number of antenna ports and the type of codebook considered). Different CSI types may have different computational complexities, and therefore may have different computation times. For example, for a high-latency CSI, Z may be set to Z2 as illustrated in Table 1 below for various SCS values. The UE 115 may ignore the A-CSI trigger if the CSI computation time requirements are not met. SCS (kHz) Z2 (Symbol) 15 40 30 72 60 141 120 152 Table 1 For low latency CSIs (e.g., Wideband Type 1 CSIs with up to 4 antenna ports), Z can be set to a value smaller than Z2, but may still be very large (for example, long duration). If no A-CSI trigger is included along with the UL grant, the minimum scheduling offset depends on the SCS and may be approximately N2, as illustrated in Table 2 below for various SCS values. SCS (kHz) N 2 (Symbol) 15 10 30 12 60 23 120 36 Table 2 In some aspects, the CSI Z or Z 2 calculation time and the UE PUSCH (without A-CSI trigger) N 2 preparation time may be described in the 3GPP TS 38.214 Release 16 document, titled “3rd Generation Partnership Project; Group Radio Access Network Technical Specification; NR; Physical layer procedures for data,” April 2020, Section 5.4 and Section 6.4, (“3GPP TS 38.214 document”) which is incorporated herein by reference. The significantly longer timeline for the 200A method (when an A-CSI trigger is included along with the UL grant) compared to the 200B method (when no A-CSI trigger is included) creates a number of scheduling issues. For example, BS 105 may be interested in acquiring CSIs for a large number of antenna ports and / or CQI and PMI subbands, which would be high-latency CSIs following the longer Z2 timeline described above. And the PUSCH source for the CSI transmission needs to be pre-booked several slots in advance as illustrated in Figure 2A (for example, 6 slots in advance when using an SCS value of 30 kHz) and Table 1. As a result, UL data cannot be transmitted in any of the pre-booked slots. Out-of-order PUSCH scheduling is not supported, so a UE cannot be scheduled with a PUSCH transmission carrying only ULSCH in the slots between the time the UL grant and A-CSI trigger are transmitted, and the time the CSI report is scheduled.Thus, if UE 115 has URLLC data ready for transmission, the URLLC data transmission will be delayed, which may be undesirable because the URLLC transmission latency requirements may not be met. Scheduling issues may be due to the time required by UE 115 to determine the requested CSI, and to simultaneously signal the A-CSI trigger and UL grant in a single PDCCH as in method 200A. Figure 3 illustrates a CSI request and resource allocation method 300 according to some aspects of the present disclosure. Method 300 addresses some of the problems caused by co-signaling an A-CSI trigger and a UL grant in a single PDCCH as in method 200A. Instead of co-signaling an A-CSI trigger and a UL grant in a single PDDCH, method 300 divides the process into separate steps: triggering the generation of a CSI report by sending a CSI count request 302 to the UE (for example, as a DCI in the PDCCH), and requesting the transmission of a CSI report by sending the UE a CSI report transmission request 310 (for example, as a DCI in the PDCCH). BS 105 may include in the CSI count request 302 information (for example, in the CSI request field) indicating which downlink source 304 (for example, CSIRS or CSI-IM) the UE 115 may use to measure the CSI.The CSI calculation request 302, however, may not include an indication of which uplink source is to be used to transmit the CSI report. Although Figure 3 illustrates a CSI measurement source 304 to be located at a time after the CSI calculation request 302, it should be understood that in other examples the CSI measurement source 304 (for example, an RRC-configured semi-persistent source) may be located at a time before the CSI calculation request 302. The UE 115 may determine the CSI and store the result as described in Figure 4-8, but refrain from transmitting the CSI immediately. Otherwise, the UE 115 is free to make other uplink transmissions (as scheduled by the BS 105) including, for example, URLLC data or other types of uplink data, until it receives a CSI report transmission request 310. In the example method 300, the BS 105 may schedule the UE 115 to send uplink data in the remaining S0 slots 340, S1 slots 342, S2 slots 344, and S3 slots 346.During S4 slot 348, UE 115 may receive a CSI report transmission request 310, including allocation of resource 312 (for example, in PUSCH) to transmit the CSI report, and in S5 slot 350, UE 115 may transmit the CSI report. BS 105 may not transmit the CSI report transmission request 310 until the CSI calculation time expires, here defined in Z'' 306, where Z'' is the minimum gap between the CSI measurement source 304 and the CSI report transmission request. Z'' 306 provides time for UE 115 to perform the CSI calculation, rather than Z 314 or Z' 316 as discussed in Figures 2A and 2B. UE 115 may also use a shortened timeline for reporting the CSI after receiving the CSI report transmission request 310, in accordance with N2 as described in Figure 2B and using the sample values ​​in Table 2 above. The minimum gap Z'' 306 may be a predetermined duration known to BS 105 and UE 115. For example, the minimum gap Z'' 306 may be defined by a wireless communication standard, such as 3GPP. In some aspects, the minimum gap Z'' 306 may be defined as the minimum gap from the end of the last symbol on the CSI measurement source 304 to the beginning of the earliest symbol of the PDCCH (or CORESET) carrying the CSI report transmission request 310. In some other aspects, the minimum gap Z'' 306 may be defined as the minimum gap from the end of the PDCCH (or CORESET) carrying the CSI count request 302 to the beginning of the earliest symbol of the PDCCH (or CORESET) carrying the CSI report transmission request 310. As discussed above, in some examples, the CSI measurement source 304 may be located at a time before the CSI count request 302.When the CSI measurement source 304 is placed at a time before the CSI calculation request 302, the minimum gap Z'' 306 may be defined as the minimum gap from the end of the PDCCH (or CORESET) carrying the CSI calculation request 302 to reduce implementation complexity at UE 115. Method 300 may use a timer mechanism as described in Figure 4-9 to determine which, if any, CSIs to transmit as part of the channel state report. For example, UE 115 may start the timer at the end 320 of the Z'' timeline 306, and the timer may run for duration 308 and end at the end 322 of duration 308. The timer duration may be preconfigured (for example, to a value specified in a 3GPP specification). Alternatively, the timer value may be configured by BS 105 (for example, via RRC signaling) or indicated by BS 105 (for example, as part of the CSI count request 302). The timer duration may be based on the information (for example, the contents of the CSI report) UE 115 will include in the CSI report (for example, the timer duration may be greater when the UE will include more information in the CSI report).The timer duration can also be based on the codebook type, number of antenna ports, channel quality indicator (CQI) type, and / or precoding matrix indicator (PMI) type associated with the CSI report. For example, a type II codebook-based CSI may be associated with a longer processing or calculation time (and therefore a longer timer duration) than a type I codebook-based CSI. In some aspects, the minimum gap Z'' 306 may be determined using a mechanism similar to that described in 3GPP document TS 38.214 Section 5.4. For example, the UE 115 may start a timer on symbol Z''ref, where Z''ref is defined as the next DL symbol with a cyclic prefix (CP) starting after a duration (for example, c) has elapsed from the last symbol of the PDCCH (or CORESET) carrying the CSI calculation request 302 triggering the CSI calculation. The duration c )' may be expressed as shown below: T”>c= Z” x (2048 + 144) χ κ2“^ x Tt, (1) where Z' ' represents Z'' 306 in OFDM symbol units, K is a constant, μ represents the SCS configuration, and Tc represents the time unit in NR. In some examples, the parameter μ can be defined as the minimum value between the SCS configuration for μρπααπ / denoted as pPDCCH, and the SCS configuration for CSI-RS, denoted as μ (csi-rs), which can be expressed as minQip ,μς _R). The parameter μ may be independent of the SCS configuration for PUSCH because there is no scheduled PUSCH source in the DCI carrying the CSI 302 count request. If a CSI report transmission request 310 arrives while the timer is running (as illustrated here), the UE 115 may transmit the most recently calculated CSI (based on the CSI measurement source 304) in the CSI report. However, if the UE 115 receives the CSI report transmission request 310 before the timer starts, it may be unable to complete the requested channel estimation and / or interference measurements or the UE 115 may have missed a previous CSI calculation request. If a CSI report transmission request is received after the timer has expired, this may indicate that the most recently calculated CSI data is now stale, or the UE 115 may have missed a previous CSI report request.In both cases—when a CSI transmission request 310 is received before the timer starts or after the timer expires—the UE 115 may transmit a CSI that may not be current (for example, the most recently stored CSI—now stale, or a previously stored CSI and based on an old CSI calculation request and associated CSI measurement source) CSI or placeholder data in the CSI report. Transmission of the stale CSI is to satisfy the CSI report transmission request as the UE will transmit as scheduled by the BS. Transmitting a non-current CSI or placeholder data may be appropriate when, for example, the transmission receiving the CSI report transmission request also includes an allowance for transmitting uplink shared channel (UL-SCH) data or a hybrid auto-repeat request (HARQ) acknowledgment. The placeholder CSI may serve as filler because the BS expects the PUSCH transmission to include CSI and UL-SCH or CSI and HARQ ACK data.It may be undesirable for the UE to discard UL-SCH or HARQ ACK data because the CSI report transmission request fails to meet the CSI report timeline. In this case, the BS 105 may determine that the CSI report is not based on the most recent CSI count request. Alternately, the UE may ignore the CSI report transmission request altogether (i.e., refrain from transmitting the CSI report), for example, if the CSI transmit request only includes a grant for CSI report transmission. In some aspects, the UE 115 may delete a stored CSI from memory based on an expired timer. Figure 4 is an example sequence diagram illustrating a communication method 400 between a BS 105 and a UE 115 according to some aspects of the present disclosure. Method 400 may use the same mechanism as method 300 discussed above in connection with Figure 3. As illustrated, method 400 includes a plurality of the actions mentioned, but embodiments of method 400 may include additional actions before, after, and between the actions mentioned. In some embodiments, one or more of the actions mentioned may be omitted or performed in a different order. In step 402, the BS 105 may transmit to the UE 115 a first CSI calculation request (also referred to as a calculation trigger), which may include an indication of the CSI measurement source on which the UE 115 should perform the CSI measurement. The BS 105 may transmit the first CSI calculation request as a downlink control information (DCI) message on the PDCCH (also referred to herein as a calculation-only DCI), and the first CSI calculation request may not include the assignment of a UL source for the transmission of the CSI report. In other words, the first CSI calculation request may not include any scheduling information for transmitting the CSI report. In step 404, the UE 115 may identify a first CSI measurement source based on the CSI calculation request. The first CSI measurement source may correspond to a CSI-RS source (for example, NZP CSI-RS) that the UE 115 may use for channel response measurements and / or a CSI-IM source that the UE 115 may use for interference measurements. The first CSI measurement source may be located after the first CSI calculation request. Alternatively, the first CSI measurement source may be located at a time before the CSI calculation request (for example, if the CSI is based on a periodic or semi-persistent CSI-RS configured via RRC). In step 406, the UE 115 may determine a first CSI based on the first CSI measurement source. The UE may perform channel and / or interference measurements to determine the CSI. The UE 115 may store the resulting CSI in a memory within the UE 115. While the UE 115 is calculating the first CSI and / or after the UE 115 has calculated the first CSI, the UE 115 may receive a scheduling grant (for example, for URLLC data) from the BS 105 and may transmit uplink data based on the scheduling grant. In some examples, the UE 115 may have multiple CSIs stored in its memory (for example, memory 704 of Figure 7) corresponding to different CSI calculation requests and CSI measurement sources. The UE 115 may store and retain multiple CSIs in its memory.In some cases, there may be a limit to the number of CSIs that can be stored by the UE, and the UE may delete stored CSIs (for example, the oldest stored CSIs) or not store newly computed CSIs if the number of CSIs in memory exceeds the limit. In step 408, the UE 115 may receive from the BS 105 (for example, as a DCI message on the PDDCH) a channel state report transmission request associated with a first CSI measurement source. The channel state report transmission request may indicate that the UE 115 may transmit a report including a first CSI calculated based on the first CSI measurement source. The CSI report transmission request may indicate which uplink source (for example, a PUSCH source) the UE 115 may use to transmit the report. In an example, the channel state report transmission request (for example, a report-specific DCI) includes a CSI request field including a value that maps to a CSI trigger state. The CSI trigger state may be associated with a CSI report configuration that references the first CSI measurement source used to report the CSI. Thus, the UE 115 may determine that the BS 105 is requesting a CSI for the first CSI measurement source. In step 410, the UE 115 may transmit a channel state report including the first CSI to the BS 105. In some examples, the UE 115 may use a timer as described below in detail in connection with method 500 (illustrated in Figure 5) to determine which, if any, stored CSI to transmit to the BS 105 in response to the CSI transmission request, as described in step 418 below. In step 412, BS 105 may send a second CSI calculation request in the same manner as the first calculation request. In step 414, the UE 115 may identify the second CSI measurement source in the same manner as the first CSI measurement source. The UE 115 may perform channel and / or interference measurements to determine the CSI. While and / or after the UE 115 calculates the CSI based on the second CSI measurement source, the UE 115 may receive a scheduling grant (for example, for URLLC data) from the BS 105 and may transmit uplink data based on the scheduling grant. The UE 115 may store the CSI determined based on the second CSI measurement source in memory (for example, memory 704 of FIG. 7). As described in step 406, the number of CSIs that the UE 115 may store may be limited. For example, if the limit is reached, the UE 115 may delete the old CSI (for example, the CSI from step 406) or not store the newly calculated CSI. In step 416, the UE 115 may determine and store a second CSI based on the second CSI measurement source. In step 418, the UE 115 may receive from the BS 105 (for example, as a DCI message on the PDCCH) a second channel state report transmission request associated with a second CSI measurement source. The second channel state report transmission request may indicate that the UE 115 may now transmit a CSI report including a second CSI calculated in response to the second CSI calculation request based on the second CSI measurement source. The second CSI report transmission request may indicate which uplink source (for example, a PUSCH source) the UE 115 may use to transmit the report. In some cases, the UE 115 may use a timer mechanism to determine whether to transmit the second CSI as requested by BS 105, the first CSI, or a different CSI or no CSI. For example, the UE 115 may start (or reset) the timer after some period (or duration) has elapsed from the end time of the second CSI measurement source. The period may be (approximately) the minimum distance between the end time of the second CSI measurement source and the time when the UE 115 can determine the second CSI. The timer duration may be preconfigured (for example, to a value defined in a 3GPP specification). Alternatively, the timer value may be indicated by BS 105 (for example, via RRC signaling) or configured by BS 105 (for example, as part of the CSI calculation request).The timer duration may be based on the information that the UE 115 will include in the second CSI report (for example, the timer duration may be greater when the UE will include more information in the second CSI report). The timer duration may also be based on the codebook type, number of antenna ports, channel quality indicator (CQI) type, and / or precoding matrix indicator (PMI) type associated with the second CSI report. In some cases, the time period during which the timer is running may correspond to the time period during which a second CSI report must be sent to the BS 105 in response to receiving a second CSI report transmission request. For example, if a second CSI report transmission request arrives while the timer is running, the UE 115 may transmit the second CSI (i.e., the most recently calculated CSI) in the CSI report. However, if the UE 115 receives the second CSI report transmission request before the timer has started, it may not have been able to complete the requested channel estimation and / or interference measurements corresponding to the second CSI measurement source. If the second CSI report transmission request is received after the timer has ended, this may indicate that the second CSI is now stale.In either case—when a second CSI transmission request is received before the timer starts or after the timer expires—the UE 115 may transmit a CSI that may not be current (for example, the most recently stored CSI—now stale, or a previously stored CSI and based on an older CSI calculation request and a corresponding CSI measurement source). For example, the UE 115 may determine to transmit the first CSI determined and stored in step 406. The UE 115 may also determine to transmit placeholder data in the CSI report instead of the second CSI. Transmitting the first CSI or placeholder data may be appropriate if, for example, the transmission receiving the second CSI transmission request also includes an allowance for transmitting UL-SCH data or a HARQ acknowledgment.Alternatively, the UE 115 may completely ignore the second CSI report transmission request (i.e., refrain from transmitting the CSI report), for example, if the second CSI transmission request only includes a grant for the transmission of the CSI report. In some cases, the UE 115 may also delete the stored CSI from memory based on an expired timer. At block 420, UE 115 additionally transmits a second channel state report (for example, in the uplink source indicated in the second CSI report transmission request) including the CSI (or placeholder data) determined to be included after step 418. Figure 5 is a flow diagram of a wireless communication method 500 according to some aspects of the present disclosure. Aspects of the method may be carried out with UE 115 alone or in combination with BS 105. At block 502, UE 115 may receive a CSI calculation request (for example, in a DCI message at PDCCH) of BS 105, as described in detail in Figure 6-9. The CSI enumeration request may not indicate any source for the UL transmission of CSI data. At block 504, the UE 115 may identify a CSI measurement source based on the CSI calculation request. The CSI measurement source may correspond to a CSI-RS source (for example, NZP CSI-RS) that the UE 115 may use for channel response measurements and / or a CSI-IM source that the UE 115 may use for interference measurements. The first CSI measurement source may be located after the first CSI calculation request. Alternatively, the first CSI measurement source may be located at a time before the CSI calculation request (for example, if the CSI is based on a periodic or semi-persistent CSI-RS configured via RRC). The method then proceeds to blocks 506 and 510. For example, the UE 115 may execute blocks 506 and 510 in parallel. In block 506, the UE 115 starts a timer after the Z'' symbol, where Z'' is the minimum interval between the end of the CSI measurement source (for example, the CSI-RS source and / or the CSI-IM source) and the start of the CSI report transmission request (for example, the earliest time the UE 115 can complete the CSI determination). After the Z'' symbol has elapsed, the UE 115 starts (or resets) a timer after which it expects to receive a CSI report transmission request. The timer may help the UE 115 determine which, if any, stored CSIs to transmit to the BS in response to a CSI transmission request as described herein. The timer duration may be preconfigured (for example, to a value specified in a 3GPP specification). Alternatively, the timer value may be indicated by the BS 105 (for example, via RRC signaling) or configured by the BS 105 (for example, as part of the CSI calculation request).The timer duration may be based on the information the UE 115 will include in the CSI report (for example, the timer duration may be greater when the UE will include more information in the CSI report). The timer duration may also be based on the codebook type, number of antenna ports, channel quality indicator (CQI) type, and / or precoding matrix indicator (PMI) type associated with the CSI report. In block 510, UE 115 determines the CSI based on the CSI measurement source. UE 115 may perform channel measurements and / or interference measurements on the CSI measurement source. For example, if the CSI measurement source includes a CSI-RS measurement source, UE 115 may perform channel measurements based on the CSI-RS transmitted in the CSI-RS measurement source. Additionally or alternatively, if the CSI measurement source includes a CSI-IM source, UE 116 may measure interference on the CSI-IM source. While performing the channel measurements (or thereafter), UE 115 may transmit UL data (for example, URLLC data unrelated to the CSI data) to BS 105. For example, BS 105 may transmit UL grants to UE 115 during this time (for example, during gap 306 of Figure 3), and UE 115 may transmit uplink data to BS 105 (for example, on PUSCH).Although Figure 5 illustrates UE 115 determining the CSI after receiving a CSI calculation request, it should be understood that in other examples, the CSI calculation request may reference a CSI measurement source (for example, an RRC-configured semi-persistent CSI source) located some time prior to the CSI calculation request. Thus, UE 115 may have already initiated or completed a CSI calculation when UE 115 receives the CSI calculation request. At block 512, UE 115 may receive a request to transmit a CSI report. If UE 115 has not yet received the request, it may remain in this block until it does. Once UE 115 receives the CSI report transmission, it may proceed to block 514. At block 514, UE 115 determines whether a CSI report transmission request was received before the timer (from block 508) started, which may indicate that UE 115 has not had time to complete the CSI determination. If a CSI report transmission request was received before the timer started, UE 115 proceeds to block 518. Otherwise, UE 115 proceeds to block 516. At block 516, UE 115 determines whether the timer (from block 508) is running. If the timer is running, UE 115 proceeds to block 520. If the timer is not running (i.e., expired), the CSI specified by the UE in block 510 may be stale, and UE 115 proceeds to block 518. In block 518, the UE 115 may transmit an old CSI (for example, previously stored and based on a previous CSI calculation request and a corresponding previous CSI measurement source) or placeholder data in the CSI report, based on the CSI report transmission request arriving too early (as determined in block 514) or too late (as determined in block 516). Transmitting the older CSI or placeholder data may be appropriate when, for example, the transmission in which the CSI transmission request arrives also includes permission to transmit uplink shared channel (UL-SCH) data or hybrid auto-repeat request (HARQ). Alternatively, the UE 115 may ignore the CSI report transmission request altogether (i.e., refrain from transmitting the CSI report), for example, if the CSI transmission request only includes permission for the transmission of the CSI report. At block 520, UE 115 may transmit a CSI report based on the current CSI. Figure 6 is a block diagram of an equivalent BS 600 according to some aspects of the present disclosure. The BS 600 may be a BS 105 in a network 100 as discussed above in Figure 1. As shown, the BS 600 may include a processor 602, a memory 604, a channel state module 608, a transceiver 610 including a modem subsystem 612 and an RF unit 614, and one or more antennas 616. These elements may be in direct or indirect communication with each other, for example via one or more buses. Processor 602 may have various features as a specialized type of processor. For example, it may include a CPU, a DSP, an ASIC, a controller, an FPGA device, other hardware devices, firmware devices, or combinations thereof configured to perform the operations described herein. Processor 602 may also be implemented as a combination of computing devices, for example, a combination of a DSP and a microprocessor, a plurality of microprocessors, one or more microprocessors in conjunction with a DSP core, or other such configurations. Memory 604 may include cache memory (for example, processor cache memory 602), RAM, MRAM, ROM, PROM, EPROM, EEPROM, flash memory, solid state memory devices, one or more hard disk drives, memristor-based arrays, other forms of volatile and non-volatile memory, or combinations of various memory types. In some aspects, memory 604 may include non-transient computer-readable media. Memory 604 may store instructions 606. Instructions 606 may include instructions that, when executed by processor 602, cause processor 602 to perform the operations described herein, for example, aspects of FIGS. 6-9 and 11. Instructions 606 may also be referred to as program code. The program code may be for causing the wireless communication device to perform these operations, for example by causing one or more processors (such as processor 602) to control or command the wireless communication device to do so.The terms instruction and code should be interpreted broadly to include any type of computer-readable statement. For example, the terms instruction and code may refer to one or more programs, routines, subroutines, functions, procedures, and so on. Instructions and code may include a single computer-readable statement or many computer-readable statements. The channel state module 608 may be implemented through hardware, software, or a combination thereof. For example, the channel state module 608 may be implemented as a processor, circuitry, and / or instructions 606 stored in memory 604 and executed by processor 602. In some examples, the channel state module 608 may be integrated within the modem subsystem 612. For example, the channel state module 608 may be implemented with a combination of software components (for example, executed by a DSP or general-purpose processor) and hardware components (for example, logic gates and circuitry) within the modem subsystem 612. The channel state module 608 may be used for various aspects of the present disclosure, for example, aspects of Figures 3-5 and 9. For example, the channel state module 608 may transmit a CSI count request (for example, in coordination with the transceiver 610). The channel state module 608 may transmit the CSI count request as a downlink control information (DCI) message on the PDCCH (also referred to herein as count-only DCI), and the CSI count request may not include the provision of a UL resource for the transmission of the CSI report by the UE 115. In other words, the CSI count request may not indicate any scheduling or resource information for transmitting the CSI report. The channel state module 608 may also be configured to transmit (for example, in coordination with the transceiver 610), to the UE 115 (for example, as a DCI message on the PDDCH), a channel state report transmission request associated with the first CSI measurement source. The first CSI measurement source may include a CSI-RS source (for example, NZP CSI-RS) and / or a CSI-IM source. The channel state report transmission request may indicate that the UE 115 should transmit a report including a CSI calculated based on the first CSI measurement source. The CSI report transmission request may indicate which uplink source (for example, a PUSCH source) the UE 115 should use when transmitting the report. In some cases, the channel state module 608 may transmit the channel state report transmission request after a first duration has elapsed since the first CSI measurement source was located (for example, the beginning or end of the first CSI measurement source).The first duration may be based on a CSI calculation timeline (for example, as may be defined in a 3GPP specification), as described in connection with Figure 3. In some cases, the channel state module 608 may also indicate to the UE 115 a configuration for a timer duration for connecting the CSI report to the first CSI measurement source (for example, via RRC signaling, or as part of a CSI calculation request). The timer duration may be based on the information (CSI report type) to be included in the CSI report (for example, the timer duration may be longer if there is more information in the CSI report). The timer duration may also be based on the codebook type, number of antenna ports, channel quality indicator (CQI) type, and / or precoding matrix indicator (PMI) type associated with the CSI report. The channel state module 608 may also be configured to receive (for example, in coordination with the transceiver 610, on PUSCH, using the source indicated by the channel state module 608 in the channel state report transmission request), in response to the channel state report transmission request, a channel state report associated with a first CSI measurement source. In some aspects, the channel state report may instead be associated with a different CSI measurement source. For example, the channel state module 608 may transmit to UE 115 an indication of a second CSI measurement source before the first CSI measurement source. Depending on when the channel state module 608 transmits the CSI report transmission request, the channel state report may be based on the second CSI measurement source.For example, if the channel state module 608 transmits a CSI report transmission request while a timer is running (for example, the timer described in Figure 5, which may be configured by the channel state module 608 ), the channel state report may be based on the first CSI measurement resource. However, if the CSI report transmission request is transmitted before the timer starts (perhaps too early for the UE 115 to complete the CSI determination) or after the timer has expired (perhaps when the CSI is stale), the channel state module 608 may instead receive a CSI report based on a second CSI measurement resource, or placeholder data. This may occur when, for example, BS 105 includes an allowance for transmitting UL-SCH data or a HARQ acknowledgment along with an allowance for transmitting the CSI report.In some cases, the channel state module 608 may not receive CSI reports at all, for example, if the channel state module 608 schedules uplink resources only for CSI reports. In some aspects, the BS 105 may transmit to the UE 115 (for example, in coordination with a transceiver 610) grants scheduling after the channel state module 608 transmits the CSI calculation request and before the channel state module 608 transmits the CSI report transmission request. The BS 115 may then receive uplink transmissions (for example, transmissions associated with URLLC data) from the UE 115 based on the scheduling grant. As shown, transceiver 610 may include a modem subsystem 612 and an RF unit 614. Transceiver 610 may be configured to communicate bidirectionally with other devices, such as UEs 115 and / or 500 and / or other core network elements. Modem subsystem 612 may be configured to modulate and / or encode data according to an MCS, for example, an LDPC coding scheme, a turbo coding scheme, a convolutional coding scheme, a digital waveform scheme, and so on.RF unit 614 may be configured to process (for example, perform analog-to-digital conversion or digital-to-analog conversion, etc.) modulated / encoded data (for example, PDCCH signals, DL data, scheduling grants, RRC configurations, reference signals, CSI-RS, CSI count requests, CSI transmit request reports, CSI-DCI count-only, CSI-report-only, etc.) from modem subsystem 612 (on outgoing transmissions) or transmissions originating from other sources such as UE 115 and / or UE 700. RF unit 614 may be further configured to perform analog beamforming in conjunction with digital beamforming. Although shown as integrated together in transceiver 610, modem subsystem 612 and / or RF unit 614 may be separate devices coupled together in BS 105 to enable BS 105 to communicate with other devices. RF unit 614 may provide modulated and / or processed data, e.g., data packets (or, more generally, data messages that may contain one or more data packets and other information), to antenna 616 for transmission to one or more other devices. Antenna 616 may then receive data messages transmitted from other devices and provide the received data messages for processing and / or demodulation at transceiver 610. Transceiver 610 may provide demodulated and decoded data (e.g., PUSCH signals, UL data, UL URLLC, CSI reports) to channel state module 608 for processing. Antenna 616 may include multiple antennas of the same or different designs to support multiple transmission links. In an example, transceiver 610 is configured to send, to UE 115, a CSI calculation request. Transceiver 610 is further configured to send, to UE 115, a CSI report transmission request associated with a first CSI measurement source, and receive, from UE 115 in response to the CSI report transmission request, a CSI report associated with the first CSI measurement source. Figure 7 is a block diagram of a UE 700 equivalent according to some aspects of the present disclosure. The UE 700 may be the UE 115 discussed above in Figure 1. As shown, the UE 700 may include a processor 702, memory 704, a channel state module 708, a transceiver 710 including a modem subsystem 712 and a radio frequency (RF) unit 714, and one or more antennas 716. These elements may be in direct or indirect communication with each other, for example via one or more buses. Processor 702 may include a central processing unit (CPU), a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a controller, a field-programmable gate array device (FPGA), other hardware devices, firmware devices, or combinations thereof configured to perform the operations described herein. Processor 702 may also be implemented as a combination of computing devices, for example, a combination of DSP and microprocessor, a number of microprocessors, one or more microprocessors in conjunction with a DSP core, or other such configuration. Memory 704 may include cache memory (for example, the cache memory of a processor 702), random access memory (RAM), magnetoresistive RAM (MRAM), read-only memory (ROM), programmable read-only memory (PROM), erasable programmable read-only memory (EPROM), electrically erasable programmable read-only memory (EEPROM), flash memory, solid state memory devices, hard disk drives, other forms of volatile and non-volatile memory, or combinations of various types of memory. In aspects, memory 704 includes non-transient computer-readable media. Memory 704 may store, or have recorded, instructions 706. Instructions 706 may include instructions that, when executed by processor 702, cause processor 702 to perform the operations described herein with reference to UE 115 in connection with aspects of the present disclosure, for example, aspects of FIGS. 6-8, 10, and 12.Instruction 706 can also be referred to as program code, which can be interpreted broadly to include all types of computer-readable statements as discussed above in relation to Figure 4. The channel state module 708 may be implemented through hardware, software, or a combination thereof. For example, the channel state module 708 may be implemented as a processor, circuitry, and / or instructions 706 stored in memory 704 and executed by processor 702. In some examples, the channel state module 708 may be integrated within the modem subsystem 712. For example, the channel state module 708 may be implemented with a combination of software components (for example, executed by a DSP or general-purpose processor) and hardware components (for example, logic gates and circuitry) within the modem subsystem 712. The operations described as being performed by the channel state module 708 may be performed by, or in conjunction with, a different module, for example, transceiver 710. Channel state module 708 may be used for various aspects of the present disclosure, for example, aspects of Figures 3-5 and 8. For example, channel state module 708 may be configured to receive (for example, in coordination with transceiver 710), from BS 105, a CSI count request. Channel state module 708 may receive the CSI count request as a downlink control information (DCI) message on the PDCCH (also referred to herein as a count-only DCI), and the CSI count request may not include the provision of a UL resource for the transmission of the CSI report. In other words, the CSI count request may not include any scheduling information for transmitting the CSI report. The channel state module 708 may also be configured to identify, upon a CSI calculation request, a first CSI measurement source. The CSI measurement sources may include CSI-RS and / or CSI-IM sources. The channel state module 708 may receive from BS 105 a configuration for the first CSI measurement source (for example, included in the CSI calculation request, or separately). The channel state module 708 may also be configured to determine the CSI based on the first CSI measurement source (for example, in coordination with the processor 702). The channel state module 708 may perform channel and / or interference measurements to determine the CSI. In some examples, the channel state module 708 may store the resulting CSI in memory 704. Thereafter, the UE 115 may continue to transmit other types of uplink data (for example, URLLC data). For example, the UE 115 may receive a scheduling grant from the BS 105 and may transmit uplink data based on the scheduling grant. In some cases, the channel state module 708 may have multiple CSIs stored in its memory corresponding to different CSI calculation requests and CSI measurement sources. For example, the channel state module 708 may have received an indication of the second CSI measurement source before the first CSI measurement source.The channel state module 708 may perform channel and / or interference measurements based on a second reference CSI measurement source and store the resulting CSI in memory 704. The channel state module 708 may store and maintain multiple CSIs in its memory 704. In some cases, there may be a limit to the number of CSIs that the channel state module 708 may store, and the channel state module 708 may delete a stored CSI or not store a newly calculated CSI if the number of CSIs in memory 704 exceeds the limit. The channel state module 708 may also be configured to receive, from the BS 105 (for example, in coordination with the transceiver 710, as a DCI message on the PDDCH), a channel state report transmission request associated with a first CSI measurement source. The channel state report transmission request may indicate that the channel state module 708 should now transmit a report including the CSI calculated based on the first CSI measurement source. The CSI report transmission request may indicate which uplink source (for example, a PUSCH source) the channel state module 708 should use when transmitting the report. The channel state module 708 may then transmit the channel state report including the CSI to the BS 105 (for example, in coordination with the transceiver 710). In some examples, the channel state module 708 may use a timer as described in method 500 (illustrated in FIG. 5) to determine which, if any, stored CSIs are to be transmitted to the BS 105 in response to a CSI transmission request. For example, the channel state module 708 may start (or reset) the timer after a period (or duration) has elapsed from the time at which the first CSI measurement source is located (e.g., the start or end of the first CSI measurement source). The period may be (approximately) the minimum gap between the end time of the CSI measurement source and the time at which the channel state module 708 can determine the CSI. The timer duration may be preconfigured (e.g., to a value specified in a 3GPP specification).Alternately, the timer value may be indicated by BS 105 (for example, via RRC signaling) or configured by BS 105 (for example, as part of a CSI calculation request). The timer duration may be based on the information the channel state module 708 will include in the CSI report (for example, the timer duration may be greater when the channel state module 708 will include more information in the CSI report). The timer duration may also be based on the codebook type, number of antenna ports, channel quality indicator (CQI) type, and / or precoding matrix indicator (PMI) type associated with the CSI report. The timer's running time period may correspond to the time period the current CSI report must be sent to the BS 105 in response to receiving a CSI report transmission request. For example, if a CSI report transmission request arrives while the timer is running, the channel state module 708 may transmit the most recently calculated CSI (i.e., based on the first CSI measurement source) in the CSI report. However, if the channel state module 708 receives the CSI report transmission request before the timer has started, it may be unable to complete the requested channel estimation and / or interference measurement. If a CSI report transmission request is received after the timer has expired, this may indicate that the most recently calculated CSI data is now stale.In both cases—when a CSI transmission request is received before the timer starts or after the timer expires—the channel state module 708 may transmit a CSI that is not the current (for example, previously stored) CSI. For example, the channel state module 708 may transmit a CSI determined in connection with the second (earlier) CSI measurement source rather than the first (later) most recent CSI measurement source. The channel state module 708 may also transmit placeholder data in the CSI report rather than the actual CSI. Transmitting an older CSI or placeholder data may be appropriate if, for example, the transmission in which the CSI transmission request arrives also includes permission to transmit UL-SCH data or a HARQ acknowledgment.Alternately, the channel state module 708 may ignore the CSI report transmission request altogether (i.e., refrain from transmitting the CSI report), for example, if the CSI transmission request only includes a grant to transmit the CSI report. In some cases, the channel state module 708 may also delete the stored CSI from memory based on an expiration time. As shown, transceiver 710 may include modem subsystem 712 and RF unit 714. Transceiver 710 may be configured to communicate bidirectionally with other devices, such as BSs 105. Modem subsystem 712 may be configured to modulate and / or encode data from memory 704 and / or channel state module 708 according to a modulation and coding scheme (MCS), for example, a low-density parity check (LDPC) coding scheme, a turbo coding scheme, a convolutional coding scheme, a digital beamforming scheme, and so on. RF unit 714 may be configured to process (for example, perform analog-to-digital conversion or digital-to-analog conversion, and so on) modulated / encoded data (for example, PUSCH signals, UL data, UL URLLC data, CSI reports) from modem subsystem 712 (on outgoing transmission) or from transmissions originating from other sources such as UE 115 or BS 105.The RF unit 714 may be further configured to perform analog beamforming in conjunction with digital beamforming. Although shown as integrated together in the transceiver 710, the modem subsystem 712 and the RF unit 714 may be separate devices combined together in the UE 115 to enable the UE 115 to communicate with other devices. RF unit 714 may provide modulated and / or processed data, e.g., data packets (or, more generally, data messages that may contain one or more data packets and other information), to antenna 716 for transmission to one or more other devices. Antenna 716 may then receive data messages transmitted from other devices. Antenna 716 may provide the received data messages for processing and / or demodulation at transceiver 710. Transceiver 710 may provide demodulated and decoded data (e.g., PDCCH signals, DL data, scheduling grants, CSI-RS, CSI report requests, CSI report transmission requests, CSI-DCI count-only, CSI-report-only, and so on) to channel state module 708 for processing. Antenna 716 may include multiple antennas of the same or different designs to maintain multiple transmission links. RF unit 714 may configure antenna 716. In an aspect, the UE 700 may include multiple transceivers 710 that implement different RATs (for example, NR and LTE). In an aspect, the UE 700 may include a single transceiver 710 that implements multiple RATs (for example, NR and LTE). In an aspect, the transceiver 710 may include multiple components, where different combinations of components may implement different RATs. In an example, transceiver 710 is configured to receive, from BS 105, a CSI calculation request. Processor 702 is configured to identify, based on the CSI calculation request, a first CSI measurement source, and determine a CSI based on the first CSI measurement source. Transceiver 710 is further configured to receive, from BS 105 after the CSI calculation request, a CSI report transmission request associated with the first CSI measurement source. Figure 8 is a flow diagram of a wireless communication method 800 according to some aspects of the present disclosure. Aspects of method 800 may be executed by computing devices (e.g., processors, processing circuits, and / or other suitable components) of a wireless communication device or other suitable means for performing the steps. For example, a wireless communication device, such as a UE 115 or 700, may use one or more components, such as a processor 702, memory 704, a channel state module 708, a transceiver 710, a modem 712, and one or more antennas 716, to execute the steps of method 800. Method 800 may use the same mechanism as method 300, sequence 400, and method 500 as described above in connection with Figures 3-5. As illustrated, method 800 includes some of the steps mentioned, but aspects of method 800 may include additional steps before, after, and between the steps mentioned.In some aspects, one or more of the steps mentioned may be omitted or performed in a different order. In block 802, the UE 115 may receive, from the BS 105, a CSI count request. The UE 115 may receive the CSI count request as a downlink control information (DCI) message on the PDCCH (also referred to herein as count-only DCI), and the CSI count request may not include a UL resource assignment for the transmission of the CSI report. In other words, the CSI count request may not include any scheduling information for transmitting the CSI report. In some cases, the UE 115 may use one or more components, such as a processor 702, a memory 704, a channel state module 708, a transceiver 710, a modem 712, and one or more antennas 716 to perform aspects of block 802. In block 804, the UE 115 may identify a first CSI measurement source based on a CSI calculation request. The first CSI measurement source may include a CSI-RS source (for example, NZP CSI-RS) and / or a CSI-IM source. The UE 115 may receive, from the BS, a configuration for the first CSI measurement source as part of the CSI calculation request, or independently. In some cases, the UE 115 may use one or more components, such as a processor 702 and a channel state module 708 to perform aspects of block 802. In block 806, the UE 115 may determine a CSI based on a first CSI measurement source. The UE 115 may perform channel and / or interference measurements to determine the CSI. In some cases, the UE 115 may store the resulting CSI in memory (e.g., memory 704) within the UE 115. Thereafter, the UE 115 may continue to transmit other types of uplink data (e.g., URLLC data). For example, the UE 115 may receive a scheduling grant from the BS 105 and may transmit uplink data based on the scheduling grant. In some cases, the UE 115 may have multiple CSIs stored in its memory according to different CSI calculation requests and CSI measurement sources. For example, prior to a CSI measurement source, the UE 115 may have received an indication of a second CSI measurement source. The UE 115 may have performed channel estimation and / or interference measurements based on the second CSI measurement source and stored the resulting CSI in memory.The UE 115 may store and maintain multiple CSIs in its memory. In some cases, there may be a limit to the number of CSIs that the UE 115 may store, and the UE 115 may delete stored CSIs or not store newly computed CSIs if the number of CSIs in its memory exceeds the limit. In some cases, the UE 115 may utilize one or more components, such as a processor 702, a memory 704, and a channel state module 708 to perform aspects of block 806. In block 808, the UE 115 may receive, from the BS 105 (for example, as a DCI message on the PDDCH), a channel state report transmission request associated with a CSI measurement source. In an example, the channel state report transmission request (for example, a report-specific DCI) includes a CSI request field including values ​​mapped to CSI trigger states. The CSI trigger states may be associated with one or more CSI report configurations. Each CSI report configuration may reference a CSI measurement source that the BS 105 requests for the report. The channel state report transmission request may indicate that the UE 115 should send a report including a CSI calculated based on the CSI measurement source. The CSI report transmission request may indicate which uplink source (for example, a PUSCH source) the UE 115 should use when sending the report. The UE 115 may then send the channel state report including the CSI to the BS 105. In some examples, the UE 115 may use a timer as described in method 500 (illustrated in Figure 5) to determine which, if any, stored CSIs to transmit to the BS 105 in response to a CSI report transmission request. For example, the UE 115 may start (or reset) a timer after some period (or duration) has elapsed from the end time of the first CSI measurement source (for example, the end of the last symbol on the CSI measurement source). The period may be (approximately) the minimum gap from the end time of the last symbol on the first CSI measurement source or the end time of the PDCCH (or CORESET) that carries the CSI count request to the start time of the earliest symbol of the PDCCH (or CORESET) that carries the CSI report transmission request, for example, as shown in equation (1) discussed above with reference to Figure 3. The timer duration may be preconfigured (for example, to a value defined in a 3GPP specification). Alternatively, the timer value may be indicated by BS 105 (for example, via RRC signaling) or configured by BS 105 (for example, as part of the CSI count request).The timer duration may be based on the information the UE 115 will include in the CSI report (for example, the timer duration may be greater when the UE will include more information in the CSI report). The timer duration may also be based on the codebook type, number of antenna ports, channel quality indicator (CQI) type, and / or precoding matrix indicator (PMI) type associated with the CSI report. The time period during which the timer runs may correspond to the time period during which the current CSI report must be sent to the BS 105 in response to receiving a CSI report transmission request. For example, if a CSI report transmission request arrives while the timer is running, the UE 115 may transmit the most recently calculated CSI (i.e., based on the source of the first CSI measurement) in the CSI report. However, if the UE 115 receives the CSI report transmission request before the timer starts, it may be unable to complete the requested channel and / or interference measurements. If the CSI report transmission request is received after the timer has expired, this may indicate that the most recently calculated CSI data is now stale. In both cases—when the CSI transmission request is received before the timer starts or after the timer has expired—the UE 115 may transmit a CSI that is not the current CSI (for example, previously stored).For example, the UE 115 may transmit a CSI determined with respect to a second (earlier) CSI measurement source, rather than a first (later) CSI measurement source. The UE 115 may also transmit placeholder data in the CSI report instead of the actual CSI. Transmitting older CSI or placeholder data may be appropriate if, for example, the transmission in which the CSI transmission request arrives also includes permission to transmit UL-SCH data or a HARQ acknowledgment. Alternatively, the UE 115 may ignore the CSI report transmission request altogether (i.e., refrain from transmitting the CSI report), for example, if the CSI transmission request only includes permission for the transmission of the CSI report. In some cases, the UE 115 may also delete the stored CSI from memory based on a timer expiration (because no CSI report transmission request has been received for the CSI). In some cases, the UE 115 may use one or more components, such as a processor 702, memory 704, a channel state module 708, a transceiver 710, a modem 712, and one or more antennas 716 to perform aspects of block 808. Figure 9 is a flow diagram of a wireless communication method 900 according to some aspects of the present disclosure. Aspects of method 900 may be executed by a computing device (e.g., a processor, processing circuit, and / or other suitable components) of a wireless communication device or other suitable means for performing the steps. For example, a wireless communication device, such as BS 105 or 600, may use one or more components, such as a processor 602, a memory 604, a channel state module 608, a transceiver 610, a modem 612, and one or more antennas 616, to execute the steps of method 900. Method 900 may use the same mechanism as method 300, sequence 400, and method 500 as described above in connection with Figure 35.As illustrated, method 900 includes some of the steps mentioned, but aspects of method 900 may include additional steps before, after, and between the steps mentioned. In some aspects, one or more of the steps mentioned may be omitted or performed in a different order. At block 902, the BS 105 may send a CSI calculation request to the UE 115. The BS 115 may send the CSI calculation request as a downlink control information (DCI) message on the PDCCH (also referred to herein as calculation-only DCI), and the CSI calculation request may not include the assignment of a UL source for the transmission of the CSI report by the UE 115. In other words, the CSI calculation request may not indicate any scheduling or source information for transmitting the CSI report. In some embodiments, the CSI calculation request may include the configuration of a first CSI measurement source, which may include a CSI-RS (for example, NZP CSIRS) or CSI-IM source. In some embodiments, the BS 105 may transit to the UE 115 configuration for the first CSI measurement source separately.In some cases, BS 105 may use one or more components, such as processor 602, memory 604, channel state module 608, transceiver 610, modem 612, and one or more antennas 616, to perform aspects of block 902. In block 906, the BS 105 may transmit, to the UE 115 (for example, as a DCI message on the PDDCH), a channel state report transmission request associated with a first CSI measurement source. In an example, the channel state report transmission request (for example, a report-specific DCI) includes a CSI request field including values ​​mapped to CSI trigger states. The CSI trigger states may be associated with one or more CSI report configurations. Each CSI report configuration may reference a CSI measurement source that the BS 105 requests for the report. The CSI measurement source referenced by the CSI report transmission request may correspond to the first CSI measurement source referenced by the CSI calculation request. The channel state report transmission request may indicate that the UE 115 should transmit a report including a CSI calculated based on the first CSI measurement source.The CSI report transmission request may indicate which uplink source (for example, a PUSCH source) the UE 115 should use when sending the report. In some cases, the BS 105 may transmit the channel state report transmission request after a first duration has elapsed from the end time of the first CSI measurement source (for example, from the end of the last symbol on the CSI measurement source). The first duration may be based on a CSI counting timeline, as described in connection with Figure 3. In some cases, the BS 105 may also indicate to the UE 115 a configuration for a timer duration for associating the CSI report to the first CSI measurement source (for example, via RRC signaling, or as part of the CSI counting request).The timer duration may be based on the information to be included in the CSI report (for example, the timer duration may be longer if more information is to be included in the CSI report). The timer duration may also be based on the codebook type, number of antenna ports, channel quality indicator (CQI) type, and / or precoding matrix indicator (PMI) type associated with the CSI report. In some cases, BS 105 may use one or more components, such as processor 602, memory 604, channel state module 608, transceiver 610, modem 612, and one or more antennas 616, to perform aspects of block 904. In block 908, the BS 105 may receive (for example, in PUSCH, using the source indicated by the BS 105 in the channel state report transmission request), in response to the channel state report transmission request, a channel state report associated with a first CSI measurement source. In some aspects, the channel state report may instead be associated with a different CSI measurement source. For example, the BS 105 may indicate to the UE 115 a second CSI measurement source before the first CSI measurement source. Depending on when the BS 115 transmits the CSI report transmission request, the channel state report may be based on the second CSI measurement source.For example, if the UE 115 receives a CSI report transmission request while a timer (e.g., the timer described in Figure 5, which may be configured by the BS 105 as discussed in connection with block 906) is running, the channel state report may be based on the first CSI measurement source. However, if the CSI report transmission request is received by the UE 115 before the timer starts (perhaps too early for the UE 115 to complete the CSI determination) or after the timer has expired (perhaps when the CSI is stale), the BS 105 may instead receive a CSI report based on a second CSI measurement source, or placeholder data. This may occur when, for example, the BS 105 includes a grant to transmit UL-SCH data or a HARQ acknowledgment along with a grant to transmit the CSI report.In some cases, the BS 105 may not receive CSI reports at all, for example, if the BS 105 schedules an uplink source only for CSI reports. In some cases, the BS 105 may transmit to the UE 115 a scheduling grant after the CSI calculation request and before the CSI report transmission request. The BS 115 may then receive uplink transmissions (for example, transmissions associated with URLLC data) from the UE 115 based on the scheduling grant. Information and signals can be represented using any of a variety of different technologies and techniques. For example, the data, instructions, commands, information, signals, bits, symbols, and chips that may be referred to throughout the above description can be represented by voltages, currents, electromagnetic waves, magnetic fields or particles, optical fields or particles, or combinations thereof. The various illustrative blocks and modules described in connection with the disclosure herein may be implemented or performed by general purpose processors, DSPs, ASICs, FPGAs or other programmable logic devices, discrete gates or transistor logic, discrete hardware components, or any combination thereof designed to perform the functions described herein. The general purpose processor may be a microprocessor, but alternatively, it may be a conventional processor, controller, microcontroller, or state machine. The processor may also be implemented as a combination of computing devices (for example, a combination of a DSP and a microprocessor, multiple microprocessors, one or more microprocessors in conjunction with a DSP core, or other configurations). The functions described herein may be implemented in hardware, processor-executed software, firmware, or a combination thereof. If implemented in processor-executed software, the functions may be stored or transmitted as one or more instructions or codes on a computer-readable medium. Other examples and implementations are within the scope of the disclosure and accompanying claims. For example, due to the nature of software, the functions described above may be implemented using processor-executed software, hardware, firmware, hard wiring, or a combination thereof. The feature implementation functions may also be physically located in various locations, including being distributed such that portions of the functions are implemented in different physical locations.Also, as used herein, includes in the claims, or as used in a list of items (for example, a list of items preceded by a phrase such as at least one of or one or more of) indicates an inclusive list so that, for example, the list [at least one of A, B, or C] means A or B or C or AB or AC or BC or ABC (i.e., A and B and C). As those skilled in the art will now appreciate and depending on the particular application at hand, numerous modifications, substitutions and variations may be made in and to the materials, apparatus, configurations and methods of use of the devices of the present disclosure without departing from the spirit and scope thereof. In view of this, the scope of the present disclosure shall not be limited to the particular embodiments illustrated and described herein, as by way of only a few examples thereof, but shall be fully commensurate with the claims. appended hereinafter and their functional equivalents.

Claims

Claim:

1. A wireless communication method performed by a user equipment (UE), comprising: receiving, from a base station (BS), a channel state information (CSI) calculation request; identifying, based on the CSI calculation request, a first CSI measurement source; determining, based on the first CSI measurement source, a CSI; and receiving, from the BS following the CSI calculation request, a CSI report transmission request associated with the first CSI measurement source.

2. The method of claim 1, wherein receiving a CSI calculation request comprises: receiving, from the BS, a CSI calculation request comprising a first CSI measurement source configuration.

3. The method of claim 1, further comprising: starting, after a first duration has elapsed from the end time of the first CSI measurement source, a timer.

4. The method of claim 3, wherein the end time of the first CSI measurement source is the end of the last symbol on the CSI measurement source.

5. The method of claim 3, further comprising: storing, in UE memory, the specified CSI; and transmitting, to the BS in response to a CSI report transmission request, the CSI report comprising the CSI stored based on the CSI report transmission request received while the timer is in progress.

6. The method of claim 3, further comprising: refraining from transmitting a CSI report based on a CSI report transmission request received before the timer starts or after the timer expires.

7. The method of claim 3, further comprising: receiving, from the BS, an indication of a second CSI measurement source earlier than the first CSI measurement source; and transmitting, to the BS in response to a CSI report transmission request, the CSI report comprising a CSI associated with the second CSI measurement source based on the CSI report transmission request received before the timer starts or after the timer expires.

8. The method of claim 3, wherein the timer duration is based on information to be included in the CSI report based on the CSI.

9. The method of claim 1, wherein: receiving a CSI calculation request comprises: receiving a first downlink control information (DCI) including a CSI calculation request; and receiving a CSI report transmission request comprises: receiving a second DCI including a CSI report transmission request.

10. The method of claim 1, further comprising: receiving, from the BS after the CSI calculation request and before the CSI report transmission request, a scheduling grant; transmitting, to the BS, an uplink data transmission based on the scheduling grant.

11. The method of claim 10, wherein the uplink data transmission is associated with ultra-reliable low latency communication (URLLC).

12. A wireless communication method performed by a base station (BS), comprising: transmitting, to a user equipment (UE), a request for calculating channel state information (CSI); transmitting, to the UE, a request for transmitting a CSI report associated with a first CSI measurement source; and receiving, from the UE in response to the request for transmitting a CSI report, a CSI report associated with the first CSI measurement source.

13. The method of claim 12, wherein the transmission of the CSI calculation request comprises: transmitting, to the UE, a CSI calculation request comprising a first CSI measurement source configuration.

14. The method of claim 12, further comprising: transmitting, to the UE, a configuration for a first CSI measurement source.

15. The method of claim 12, wherein the transmission of a CSI report transmission request comprises: transmitting, after a first duration has elapsed from the end time of the first CSI measurement source, a CSI report transmission request.

16. The method of claim 15, wherein the end time of the first CSI measurement source is the end of the last symbol on the CSI measurement source.

17. The method of claim 12, further comprising: transmitting, to the UE, a configuration for a timer duration for connecting the CSI report to a first CSI measurement source.

18. The method of claim 17, further comprising: determining a timer duration based on information to be included in a CSI report based on the CSI.

19. The method of claim 12, further comprising: transmitting, to the UE, an indication of a second CSI measurement source earlier than the first CSI measurement source; and receiving, from the UE in response to a request for transmission of a CSI report, a CSI report including a CSI associated with the second CSI measurement source.

20. The method of claim 12, wherein: the transmission of a CSI calculation request comprises: transmitting a first downlink control information (DCI) including a CSI calculation request; and the transmission of a CSI report transmission request comprises: transmitting a second DCI including a CSI report transmission request.

21. User Equipment (UE), comprising: a transceiver configured to: receive, from a base station (BS), a channel state information (CSI) calculation request; and a processor configured to: identify, based on the CSI calculation request, a first CSI measurement source; determine, based on the first CSI measurement source, a CSI, wherein the transceiver is further configured to: receive, from the BS following the CSI calculation request, a CSI report transmission request associated with the first CSI measurement source.

22. The UE of claim 21, wherein the transceiver configured to receive the CSI measurement request is further configured to: receive, from the BS, the CSI measurement request comprising a first CSI measurement source configuration.

23. The UE in claim 21, wherein the transceiver is further configured to: receive, from the BS, a configuration for a first CSI measurement source.

24. The UE of claim 21, wherein the transceiver is further configured to: transmit, to the BS in response to a CSI report transmission request, the CSI report including the CSI.

25. The UE of claim 21, wherein the processor is further configured to: start, after a first duration has elapsed from the end time of the first CSI measurement source, a timer.

26. The UE in claim 21, wherein the end time of the first CSI measurement source is the end of the last symbol on the CSI measurement source.

27. The UE of claim 25, further comprising a memory, wherein: the processor is further configured to: store, in the memory, the specified CSI; and the transceiver is further configured to: transmit, to the BS in response to a CSI report transmission request, the CSI report including a CSI stored based on the CSI report transmission request received while the timer is in progress.

28. The UE of claim 25, wherein the processor is further configured to: refrain from transmitting a CSI report based on a CSI report transmission request received before the timer starts or after the timer expires.

29. The UE of claim 25, wherein the transceiver is further configured to: receive, from the BS, an indication of a second CSI measurement source earlier than the first CSI measurement source; and transmit, to the BS in response to a CSI report transmission request, the CSI report including a CSI associated with the second CSI measurement source based on the CSI report transmission request received before the timer starts or after the timer expires.

30. A base station (BS), comprising: a processor; and a transceiver configured to: transmit, to a user equipment (UE), a request for a channel state information (CSI) calculation; transmit, to the UE, a request for a CSI report transmission associated with a first CSI measurement source; and receive, from the UE in response to the CSI report transmission request, a CSI report associated with the first CSI measurement source.

31. The BS of claim 30, wherein the transceiver configured to transmit the CSI measurement request is further configured to: transmit, to the UE, the CSI calculation request comprising a first CSI measurement source configuration.

32. The BS in claim 30, wherein the transceiver is further configured to: transmit, to the UE, a configuration for the first CSI measurement source.

33. The BS of claim 30, wherein the transceiver transmission configured to transmit a CSI report transmission request is configured to: transmit, after a first duration has elapsed from the end time of the first CSI measurement source, a CSI report transmission request.

34. The BS in claim 33, wherein the end time of the first CSI measurement source is the end of the last symbol on the CSI measurement source.

35. User Equipment (UE), comprising: means for receiving, from a base station (BS), a channel state information (CSI) calculation request; means for identifying, based on the CSI calculation request, a first CSI measurement source; means for determining, based on the first CSI measurement source, a CSI; and means for receiving, from the BS following the CSI calculation request, a CSI report transmission request associated with the first CSI measurement source.

Images