WO2021217287A1

WO2021217287A1 - Channel state information reporting timing configuration

Info

Publication number: WO2021217287A1
Application number: PCT/CN2020/086918
Authority: WO
Inventors: Bo Chen; Yu Zhang; Jay Kumar Sundararajan; Ruifeng MA; Pavan Kumar Vitthaladevuni; Yeliz Tokgoz; Krishna Kiran Mukkavilli; Hao Xu; Tingfang Ji
Original assignee: Qualcomm Incorporated
Priority date: 2020-04-26
Filing date: 2020-04-26
Publication date: 2021-11-04

Abstract

Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment may receive, in a first set of symbols of a downlink channel, configuration information triggering an interference measurement resource (IMR)-only aperiodic channel state information report associated with a latency class of a plurality of latency classes; perform, during at least a portion of a second set of symbols, a measurement of a channel state information reference signal; and transmit, in a third set of symbols of an uplink channel, the IMR-only channel state information report based at least in part on performing the measurement, wherein a timing of the third set of symbols relative to the first set of symbols or the second set of symbols is based at least in part on the IMR-only aperiodic channel state information report and the latency class. Numerous other aspects are provided.

Description

CHANNEL STATE INFORMATION REPORTING TIMING CONFIGURATION

FIELD OF THE DISCLOSURE

Aspects of the present disclosure generally relate to wireless communication and to techniques and apparatuses for channel state information reporting timing configuration.

BACKGROUND

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

A wireless communication network may include a number of base stations (BSs) that can support communication for a number of user equipment (UEs) . A user equipment (UE) may communicate with a base station (BS) via the downlink and uplink. The downlink (or forward link) refers to the communication link from the BS to the UE, and the uplink (or reverse link) refers to the communication link from the UE to the BS. As will be described in more detail herein, a BS may be referred to as a Node B, a gNB, an access point (AP) , a radio head, a transmit receive point (TRP) , a New Radio (NR) BS, a 5G Node B, and/or the like.

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

BRIEF DESCRIPTION OF THE DRAWINGS

So that the above-recited features of the present disclosure can be understood in detail, a more particular description, briefly summarized above, may be had by reference to aspects, some of which are illustrated in the appended drawings. It is to be noted, however, that the appended drawings illustrate only certain typical aspects of this disclosure and are therefore not to be considered limiting of its scope, for the description may admit to other equally effective aspects. The same reference numbers in different drawings may identify the same or similar elements.

Fig. 1 is a block diagram conceptually illustrating an example of a wireless communication network, in accordance with various aspects of the present disclosure.

Fig. 2 is a block diagram conceptually illustrating an example of a base station in communication with a UE in a wireless communication network, in accordance with various aspects of the present disclosure.

Fig. 3 is a diagram illustrating an example of channel state information reporting timing configuration, in accordance with various aspects of the present disclosure.

Fig. 4 is a diagram illustrating an example process performed, for example, by a user equipment, in accordance with various aspects of the present disclosure.

SUMMARY

In some aspects, a method of wireless communication, performed by a user equipment, may include receiving, in a first set of symbols of a downlink channel, configuration information triggering an interference measurement resource (IMR) -only aperiodic channel state information report associated with a latency class of a plurality of latency classes; performing, during at least a portion of a second set of symbols, a measurement of a channel state information reference signal based at least in part on receiving the configuration information triggering the IMR-only aperiodic channel state information report; and transmitting, in a third set of symbols of an uplink channel, the IMR-only channel state information report based at least in part on performing the measurement, wherein a timing of the third set of symbols relative to the first set of symbols or the second set of symbols is based at least in part on the IMR-only aperiodic channel state information report and the latency class.

In some aspects, a user equipment for wireless communication may include a memory and one or more processors operatively coupled to the memory. The memory and the one or more processors may be configured to receive, in a first set of symbols of a downlink channel, configuration information triggering an IMR-only aperiodic channel state information report associated with a latency class of a plurality of latency classes; perform, during at least a portion of a second set of symbols, a measurement of a channel state information reference signal based at least in part on receiving the configuration information triggering the IMR-only aperiodic channel state information report; and transmit, in a third set of symbols of an uplink channel, the IMR-only channel state information report based at least in part on performing the measurement, wherein a timing of the third set of symbols relative to the first set of symbols or the second set of symbols is based at least in part on the IMR-only aperiodic channel state information report and the latency class.

In some aspects, a non-transitory computer-readable medium may store one or more instructions for wireless communication. The one or more instructions, when executed by one or more processors of a user equipment, may cause the one or more processors to receive, in a first set of symbols of a downlink channel, configuration information triggering an IMR-only aperiodic channel state information report associated with a latency class of a plurality of latency classes; perform, during at least a portion of a second set of symbols, a measurement of a channel state information reference signal based at least in part on receiving the configuration information triggering the IMR-only aperiodic channel state information report; and transmit, in a third set of symbols of an uplink channel, the IMR-only channel state information report based at least in part on performing the measurement, wherein a timing of the third set of symbols relative to the first set of symbols or the second set of symbols is based at least in part on the IMR-only aperiodic channel state information report and the latency class.

In some aspects, an apparatus for wireless communication may include means for receiving, in a first set of symbols of a downlink channel, configuration information triggering an IMR-only aperiodic channel state information report associated with a latency class of a plurality of latency classes; means for performing, during at least a portion of a second set of symbols, a measurement of a channel state information reference signal based at least in part on receiving the configuration information triggering the IMR-only aperiodic channel state information report; and means for transmitting, in a third set of symbols of an uplink channel, the IMR-only channel state information report based at least in part on performing the measurement, wherein a timing of the third set of symbols relative to the first set of symbols or the second set of symbols is based at least in part on the IMR-only aperiodic channel state information report and the latency class.

Aspects generally include a method, apparatus, system, computer program product, non-transitory computer-readable medium, user equipment, base station, wireless communication device, and/or processing system as substantially described herein with reference to and as illustrated by the drawings and specification.

The foregoing has outlined rather broadly the features and technical advantages of examples according to the disclosure in order that the detailed description that follows may be better understood. Additional features and advantages will be described hereinafter. The conception and specific examples disclosed may be readily utilized as a basis for modifying or designing other structures for carrying out the same purposes of the present disclosure. Such equivalent constructions do not depart from the scope of the appended claims. Characteristics of the concepts disclosed herein, both their organization and method of operation, together with associated advantages will be better understood from the following description when considered in connection with the accompanying figures. Each of the figures is provided for the purposes of illustration and description, and not as a definition of the limits of the claims.

DETAILED DESCRIPTION

Various aspects of the disclosure are described hereinafter with reference to the accompanying drawings. This disclosure may, however, be embodied in many different forms and should not be construed as limited to any specific structure or function presented throughout this disclosure. Rather, these aspects are provided so that this disclosure will be thorough and complete, and will convey the scope of the disclosure to those skilled in the art. Based on the teachings herein one skilled in the art should appreciate that the scope of the disclosure is intended to cover any aspect of the disclosure disclosed herein, whether implemented independently of or combined with any other aspect of the disclosure. For example, an apparatus may be implemented or a method may be practiced using any number of the aspects set forth herein. In addition, the scope of the disclosure is intended to cover such an apparatus or method which is practiced using other structure, functionality, or structure and functionality in addition to or other than the various aspects of the disclosure set forth herein. It should be understood that any aspect of the disclosure disclosed herein may be embodied by one or more elements of a claim.

Several aspects of telecommunication systems will now be presented with reference to various apparatuses and techniques. These apparatuses and techniques will be described in the following detailed description and illustrated in the accompanying drawings by various blocks, modules, components, circuits, steps, processes, algorithms, and/or the like (collectively referred to as “elements” ) . These elements may be implemented using hardware, software, or combinations thereof. Whether such elements are implemented as hardware or software depends upon the particular application and design constraints imposed on the overall system.

It should be noted that while aspects may be described herein using terminology commonly associated with 3G and/or 4G wireless technologies, aspects of the present disclosure can be applied in other generation-based communication systems, such as 5G and later, including NR technologies.

Fig. 1 is a diagram illustrating a wireless network 100 in which aspects of the present disclosure may be practiced. The wireless network 100 may be an LTE network or some other wireless network, such as a 5G or NR network. The wireless network 100 may include a number of BSs 110 (shown as BS 110a, BS 110b, BS 110c, and BS 110d) and other network entities. A BS is an entity that communicates with user equipment (UEs) and may also be referred to as a base station, a NR BS, a Node B, a gNB, a 5G node B (NB) , an access point, a transmit receive point (TRP) , and/or the like. Each BS may provide communication coverage for a particular geographic area. In 3GPP, the term “cell” can refer to a coverage area of a BS and/or a BS subsystem serving this coverage area, depending on the context in which the term is used.

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

In some aspects, a cell may not necessarily be stationary, and the geographic area of the cell may move according to the location of a mobile BS. In some aspects, the BSs may be interconnected to one another and/or to one or more other BSs or network nodes (not shown) in the wireless network 100 through various types of backhaul interfaces such as a direct physical connection, a virtual network, and/or the like using any suitable transport network.

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

Wireless network 100 may be a heterogeneous network that includes BSs of different types, e.g., macro BSs, pico BSs, femto BSs, relay BSs, and/or the like. These different types of BSs may have different transmit power levels, different coverage areas, and different impacts on interference in wireless network 100. For example, macro BSs may have a high transmit power level (e.g., 5 to 40 watts) whereas pico BSs, femto BSs, and relay BSs may have lower transmit power levels (e.g., 0.1 to 2 watts) .

A network controller 130 may couple to a set of BSs and may provide coordination and control for these BSs. Network controller 130 may communicate with the BSs via a backhaul. The BSs may also communicate with one another, e.g., directly or indirectly via a wireless or wireline backhaul.

UEs 120 (e.g., 120a, 120b, 120c) may be dispersed throughout wireless network 100, and each UE may be stationary or mobile. A UE may also be referred to as an access terminal, a terminal, a mobile station, a subscriber unit, a station, and/or the like. A UE may be a cellular phone (e.g., a smart phone) , a personal digital assistant (PDA) , a wireless modem, a wireless communication device, a handheld device, a laptop computer, a cordless phone, a wireless local loop (WLL) station, a tablet, a camera, a gaming device, a netbook, a smartbook, an ultrabook, a medical device or equipment, biometric sensors/devices, wearable devices (smart watches, smart clothing, smart glasses, smart wrist bands, smart jewelry (e.g., smart ring, smart bracelet) ) , an entertainment device (e.g., a music or video device, or a satellite radio) , a vehicular component or sensor, smart meters/sensors, industrial manufacturing equipment, a global positioning system device, or any other suitable device that is configured to communicate via a wireless or wired medium.

Some UEs may be considered machine-type communication (MTC) or evolved or enhanced machine-type communication (eMTC) UEs. MTC and eMTC UEs include, for example, robots, drones, remote devices, sensors, meters, monitors, location tags, and/or the like, that may communicate with a base station, another device (e.g., remote device) , or some other entity. A wireless node may provide, for example, connectivity for or to a network (e.g., a wide area network such as Internet or a cellular network) via a wired or wireless communication link. Some UEs may be considered Internet-of-Things (IoT) devices, and/or may be implemented as NB-IoT (narrowband internet of things) devices. Some UEs may be considered a Customer Premises Equipment (CPE) . UE 120 may be included inside a housing that houses components of UE 120, such as processor components, memory components, and/or the like. In some aspects, the processor components and the memory components may be coupled together. For example, the processor components (e.g., one or more processors) and the memory components (e.g., a memory) may be operatively coupled, communicatively coupled, electronically coupled, electrically coupled, and/or the like.

In general, any number of wireless networks may be deployed in a given geographic area. Each wireless network may support a particular radio access technology (RAT) and may operate on one or more frequencies. A RAT may also be referred to as a radio technology, an air interface, and/or the like. A frequency may also be referred to as a carrier, a frequency channel, and/or the like. Each frequency may support a single RAT in a given geographic area in order to avoid interference between wireless networks of different RATs. In some cases, NR or 5G RAT networks may be deployed.

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

As indicated above, Fig. 1 is provided as an example. Other examples may differ from what is described with regard to Fig. 1.

Fig. 2 shows a block diagram of a design 200 of base station 110 and UE 120, which may be one of the base stations and one of the UEs in Fig. 1. Base station 110 may be equipped with T antennas 234a through 234t, and UE 120 may be equipped with R antennas 252a through 252r, where in general T ≥ 1 and R ≥ 1.

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

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

Network controller 130 may include communication unit 294, controller/processor 290, and memory 292. Network controller 130 may include, for example, one or more devices in a core network. Network controller 130 may communicate with base station 110 via communication unit 294.

On the uplink, at UE 120, a transmit processor 264 may receive and process data from a data source 262 and control information (e.g., for reports comprising RSRP, RSSI, RSRQ, CQI, and/or the like) from controller/processor 280. Transmit processor 264 may also generate reference symbols for one or more reference signals. The symbols from transmit processor 264 may be precoded by a TX MIMO processor 266 if applicable, further processed by modulators 254a through 254r (e.g., for DFT-s-OFDM, CP-OFDM, and/or the like) , and transmitted to base station 110. In some aspects, the UE 120 includes a transceiver. The transceiver may include any combination of antenna (s) 252, modulators and/or demodulators 254, MIMO detector 256, receive processor 258, transmit processor 264, and/or TX MIMO processor 266. The transceiver may be used by a processor (e.g., controller/processor 280) and memory 282 to perform aspects of any of the methods described herein, for example, as described with reference to Figs. 3-4.

At base station 110, the uplink signals from UE 120 and other UEs may be received by antennas 234, processed by demodulators 232, detected by a MIMO detector 236 if applicable, and further processed by a receive processor 238 to obtain decoded data and control information sent by UE 120. Receive processor 238 may provide the decoded data to a data sink 239 and the decoded control information to controller/processor 240. Base station 110 may include communication unit 244 and communicate to network controller 130 via communication unit 244. In some aspects, the base station 110 includes a transceiver. The transceiver may include any combination of antenna (s) 234, modulators and/or demodulators 232, MIMO detector 236, receive processor 238, transmit processor 220, and/or TX MIMO processor 230. The transceiver may be used by a processor (e.g., controller/processor 240) and memory 242 to perform aspects of any of the methods described herein, for example, as described with reference to Figs. 3-4.

Controller/processor 240 of base station 110, controller/processor 280 of UE 120, and/or any other component (s) of Fig. 2 may perform one or more techniques associated with channel state information reporting timing configuration, as described in more detail elsewhere herein. For example, controller/processor 240 of base station 110, controller/processor 280 of UE 120, and/or any other component (s) of Fig. 2 may perform or direct operations of, for example, process 400 of Fig. 4 and/or other processes as described herein.

Memories

242 and 282 may store data and program codes for base station 110 and UE 120, respectively. In some aspects, memory 242 and/or memory 282 may comprise a non-transitory computer-readable medium storing one or more instructions for wireless communication. For example, the one or more instructions, when executed (e.g., directly, or after compiling, converting, interpreting, and/or the like) by one or more processors of the base station 110 and/or the UE 120, may perform or direct operations of, for example, process 400 of Fig. 4 and/or other processes as described herein. In some aspects, executing instructions may include running the instructions, converting the instructions, compiling the instructions, interpreting the instructions, and/or the like. A scheduler 246 may schedule UEs for data transmission on the downlink and/or uplink.

In some aspects, UE 120 may include means for receiving, in a first set of symbols of a downlink channel, configuration information triggering an interference measurement resource (IMR) -only aperiodic channel state information report associated with a latency class of a plurality of latency classes, means for performing, during at least a portion of a second set of symbols, a measurement of a channel state information reference signal based at least in part on receiving the configuration information triggering the IMR-only aperiodic channel state information report, means for transmitting, in a third set of symbols of an uplink channel, the IMR-only channel state information report based at least in part on performing the measurement, wherein a timing of the third set of symbols relative to the first set of symbols or the second set of symbols is based at least in part on the IMR-only aperiodic channel state information report and the latency class, and/or the like. In some aspects, such means may include one or more components of UE 120 described in connection with Fig. 2, such as controller/processor 280, transmit processor 264, TX MIMO processor 266, MOD 254, antenna 252, DEMOD 254, MIMO detector 256, receive processor 258, and/or the like.

As indicated above, Fig. 2 is provided as an example. Other examples may differ from what is described with regard to Fig. 2.

In some communications systems, such as 5G, a UE may perform and report a plurality of different types of channel state information (CSI) measurements. For example, in a single downlink bandwidth part with a single CSI reporting band, a UE may determine a CSI reference signal (RS) resource indicator (CRI) for a CSI interference measurement (IM) reference signal received power (RSRP) measurement. In this case, the UE may perform the CRI-CSI-IM RSRP as an inter-cell interference measurement using resources shared with other UEs in a serving cell. Additionally, or alternatively, the UE may determine a CRI for a non-zero-power (NZP) CSI RS RSRP measurement. In this case, the UE may perform the CRI-NZP-CSI-RS RSRP measurement as an intra-cell multi-user multiple-input multiple-output (MU-MIMO) inter-UE interference measurement using UE-specific configured NZP CSI-RS resources. Additionally, or alternatively, the UE may determine a CRI-IM-RSRP value, which may be a composite interference measurement of accumulated interference from both an NZP CSI-RS and a CSI-IM.

The UE may provide information identifying a result of one or more CSI measurements to enable a BS to generate a downlink precoder. Low-latency CSI feedback may be configured to enable accurate generation of the downlink precoder in cases where interference is varying rapidly with time (e.g., in burst traffic scenarios, such as with extended reality and augmented reality use cases) . A UE may include one or more CSI processing units (which may sometimes be termed CPUs) to process the CSI measurements, to enable generation of a CSI report for transmission to a BS. However, the UE may use the same quantity of CSI processing units and/or the same timing for processing each type of CSI measurement. As a result, the UE may use excessive CSI processing unit resources and/or allocate excessive time for processing a CSI measurement when performing some types of CSI measurements under some network conditions.

Some aspects described herein provide CSI reporting timing configuration. For example, a UE may receive a downlink transmission (e.g., a physical downlink control channel (PDCCH) transmission) triggering an interference measurement resource (IMR) -only aperiodic CSI report, and may determine a quantity of CSI processing units and/or a timing for performing an IMR-only aperiodic CSI measurement and transmitting an IMR-only aperiodic CSI report (e.g., via a physical uplink shared channel (PUSCH) message) . In some aspects, an IMR-only aperiodic CSI report may include a report regarding a measurement of a CSI-IM resource (and not a CSI-RS resource) . In some aspects, configuration information identifying the CSI report timing may include information identifying a quantity of symbols between a PDCCH and a CSI-IM resource, a CSI-IM resource and a PUSCH, a PDCCH and a PUSCCH, and/or the like. In this case, the UE may determine the quantity of CSI processing units and/or the timing based at least in part on a latency class of the IMR-only aperiodic CSI report, a UE capability, and/or the like. For example, the IMR-only aperiodic CSI report may be associated with a latency class of a plurality of latency classes (e.g., high, medium, low, or any other type of latency classification) , which may relate to a condition for a CSI timeline requirement, as described in more detail below. In this way, the UE may enable reduced latency and/or improved CSI processing unit efficiency relative to using the same quantity of CSI processing units and timing for each type of CSI measurement.

Fig. 3 is a diagram illustrating an example 300 of channel state information reporting timing configuration, in accordance with various aspects of the present disclosure. As shown in Fig. 3, example 300 includes a BS 110 and a UE 120.

As further shown in Fig. 3, and by reference number 310, UE 120 may receive a downlink channel transmission triggering a CSI IM measurement and CSI reporting on an uplink channel. For example, UE 120 may receive a PDCCH message in a first set of resources (e.g., one or more first symbols) associated with triggering a CSI IM measurement in a second set of resources (e.g., one or more second symbols of a plurality of second symbols) . In this case, UE 120 may be triggered to transmit an IMR-only CSI report using PUSCH resources in a third set of resources (e.g., one or more third symbols) .

As further shown in Fig. 3, and by reference number 320, UE 120 may determine a timing for performing a CSI IM measurement and transmitting an IMR-only CSI report. For example, based at least in part on UE capability (e.g., a type of UE of UE 120, an IMR-only measurement capability of UE 120, and/or the like) , UE 120 may determine a quantity of symbols between receiving the PDCCH message triggering and transmitting a PUSCH to convey an IMR-only CSI report (shown as Z) , a timing between performing a CSI IM measurement and transmitting the PUSCH (show as Z') , and/or the like. In some aspects, UE capability information from which UE 120 may determine the UE capability may include information identifying the type of UE 120, the IMR-only measurement capability of UE 120, and/or the like. Additionally, or alternatively, UE 120 may determine the timing based at least in part on a latency class of the IMR-only CSI report. For example, UE 120 may determine a latency class for the IMR-only CSI report and may select a quantity of symbols for the gap between the PDCCH and the PUSCH based at least in part on the latency class. In some aspects, the latency class may be based on a resource configuration (e.g., whether a single resource is configured or a plurality of resources are configured for performing a CSI-IM measurement) , a quantity of CSI processing units (e.g., processing chains for processing CSI measurements) that are available, a feedback frequency configuration (e.g., a whether feedback is to be provided using a wideband frequency or granularity) , and/or the like.

In some aspects, for a particular latency class, UE 120 may determine a quantity of symbols between an end of the PDCCH and a beginning of the PUSCH (e.g., greater than 22 symbols, 33 symbols, 44 symbols, 97 symbols, and/or the like) . Similarly, for the particular latency class UE 120 may determine a quantity of symbols between an end of a resource in which a CSI IM measurement is performed and the beginning of the PUSCH (e.g., greater than 16 symbols, 30 symbols, 42 symbols, 85 symbols, and/or the like) . In some aspects, UE 120 may determine the timing with respect to a particular subcarrier configuration. For example, UE 120 may determine the quantity of symbols (e.g., orthogonal frequency division multiplexing (OFDM) symbols) based at least in part on smallest subcarrier spacing of a group of subcarrier spacings that includes subcarrier spacings of the PDCCH, a physical uplink control channel (PUCCH) , and/or the CSI IM or NZP CSI RS.

In some aspects, UE 120 may determine the latency class based at least in part on a resource configuration of a CSI IM resource (e.g., identified in the PDCCH message) , a quantity of CSI processing units that are available for processing the CSI IM measurement, a feedback frequency (e.g., a granularity with which CSI IM feedback is configured to be provided) , and/or the like. For example, UE 120 may determine that the latency class is an ultra-low latency class when a CSI report is aperiodically triggered without UE 120 having transmitted a PUSCH with a transport block and/or a hybrid automatic repeat request (HARQ) acknowledgement (ACK) , when no CSI processing units are already occupied with processing other CSI measurements, when the CSI IM resource for measurement corresponds to a single CSI with a wideband frequency (e.g., a wideband granularity) , and when the CSI report is triggered for no more than 4 CSI RS ports in a single resource without a CRI report. Additionally, or alternatively, UE 120 may determine that the latency class is a low-latency class when the PDCCH triggers a CSI IM or an NZP CSI RS with a single resource configuration or when the PDCCH triggers a CSI IM with a plurality of resource configurations. Additionally, or alternatively, UE 120 may determine that the latency class is a normal (non-low latency) latency class when the PDCCH triggers an IMR-only CSI report that does not satisfy criteria for an ultra-low latency class or a low-latency class.

As further shown in Fig. 3, and by reference number 330, UE 120 may perform and process a CSI measurement. For example, UE 120 may perform a measurement of a CSI IM resource, an NZP CSI RS resource, and/or the like. In this case, UE 120 determine a quantity of CSI processing units for processing an IMR-only CSI report based at least in part on a quantity of configured CSI IM or NZP CSI resources, a CSI reporting type (e.g., whether the CSI reporting is periodic, semi-persistent, or aperiodic) , a determined timing, and/or the like. As an example, for a single resource configuration (e.g., a single CSI IM resource or NZP CSI RS resource, such as in a normal latency class scenario) , UE 120 may determine to use a single CSI processing unit for CSI reporting (e.g., including sub-band granularity reporting) . In some aspects, such as when an ultra-low latency class is determined for the CSI reporting, UE 120 may use all available CSI processing units. Additionally, or alternatively, for a low-latency class scenario, UE 120 may select either a single CSI processing unit (e.g., for a single CSI IM or NZP CSI RS resource) or a quantity of CSI processing units corresponding to a quantity of CSI IM or NZP CSI RS resources (e.g., when a plurality of resources are configured) in an interference measurement resource set.

As further shown in Fig. 3, and by reference number 340, UE 120 may transmit a CSI report. For example, based at least in part on performing a CSI measurement and processing a CSI report, UE 120 may transmit the CSI report after a threshold quantity of symbols corresponding to a determined timing. In this way, UE 120 ensures that the timing for transmitting the CSI report accounts for characteristics of the CSI report, such as a latency class, a UE capability, and/or the like.

As indicated above, Fig. 3 is provided as an example. Other examples may differ from what is described with respect to Fig. 3.

Fig. 4 is a diagram illustrating an example process 400 performed, for example, by a UE, in accordance with various aspects of the present disclosure. Example process 400 is an example where the UE (e.g., UE 120 and/or the like) performs operations associated with channel state information reporting timing configuration.

As shown in Fig. 4, in some aspects, process 400 may include receiving, in a first set of symbols of a downlink channel, configuration information triggering an IMR-only aperiodic channel state information report associated with a latency class of a plurality of latency classes (block 410) . For example, the UE (e.g., using receive processor 258, transmit processor 264, controller/processor 280, memory 282, and/or the like) may receive, in a first set of symbols of a downlink channel, configuration information triggering an IMR-only aperiodic channel state information report associated with a latency class of a plurality of latency classes, as described above.

As further shown in Fig. 4, in some aspects, process 400 may include performing, during at least a portion of a second set of symbols, a measurement of a channel state information reference signal based at least in part on receiving the configuration information triggering the IMR-only aperiodic channel state information report (block 420) . For example, the UE (e.g., using receive processor 258, transmit processor 264, controller/processor 280, memory 282, and/or the like) may perform, during at least a portion of a second set of symbols, a measurement of a channel state information reference signal based at least in part on receiving the configuration information triggering the IMR-only aperiodic channel state information report, as described above.

As further shown in Fig. 4, in some aspects, process 400 may include transmitting, in a third set of symbols of an uplink channel, the IMR-only channel state information report based at least in part on performing the measurement, wherein a timing of the third set of symbols relative to the first set of symbols or the second set of symbols is based at least in part on the IMR-only aperiodic channel state information report and the latency class (block 430) . For example, the UE (e.g., using receive processor 258, transmit processor 264, controller/processor 280, memory 282, and/or the like) may transmit, in a third set of symbols of an uplink channel, the IMR-only channel state information report based at least in part on performing the measurement, as described above. In some aspects, a timing of the third set of symbols relative to the first set of symbols or the second set of symbols is based at least in part on the IMR-only aperiodic channel state information report and the latency class.

Process 400 may include additional aspects, such as any single aspect or any combination of aspects described below and/or in connection with one or more other processes described elsewhere herein.

In a first aspect, process 400 includes transmitting UE capability information identifying a capability of the UE, and receiving the configuration information triggering the IMR-only aperiodic channel state information report includes receiving the configuration information triggering the IMR-only aperiodic channel state information report based at least in part on the capability of the UE.

In a second aspect, alone or in combination with the first aspect, the plurality of latency classes includes at least one of: an ultra-low latency class, a low latency class, or a high latency class.

In a third aspect, alone or in combination with one or more of the first and second aspects, the latency class is based at least in part on at least one of: a resource configuration, a channel state information processing unit, or a feedback frequency configuration.

In a fourth aspect, alone or in combination with one or more of the first through third aspects, the latency class is based at least in part on a configuration of the IMR-only channel state information report.

In a fifth aspect, alone or in combination with one or more of the first through fourth aspects, the configuration of the IMR-only channel state information report is aperiodically triggered without a transmission of a physical uplink shared channel including at least one of a transport block or a hybrid automatic repeat request acknowledgement message.

In a sixth aspect, alone or in combination with one or more of the first through fifth aspects, the configuration of the IMR-only channel state information report is related to a quantity of occupied channel state information processing units.

In a seventh aspect, alone or in combination with one or more of the first through sixth aspects, the configuration of the IMR-only channel state information report is related to at least one of: a quantity of channel state information reference signals with a wideband frequency-granularity, or a quantity of channel state information reference signal ports in a single resource without a channel state information reference signal resource indicator report.

In an eighth aspect, alone or in combination with one or more of the first through seventh aspects, the configuration of the IMR-only channel state information report is related to a resource configuration and a type of the IMR-only channel state information report.

In a ninth aspect, alone or in combination with one or more of the first through eighth aspects, the timing is based at least in part on a quantity of symbols with a subcarrier configuration.

In a tenth aspect, alone or in combination with one or more of the first through ninth aspects, the subcarrier configuration is based at least in part on a subcarrier spacing of at least one of: a physical downlink control channel, a physical uplink shared channel, a channel state information interference measurement resource, or a non-zero power channel state information reference signal.

In an eleventh aspect, alone or in combination with one or more of the first through tenth aspects, process 400 includes processing, using one or more channel state information processing units of the UE, the measurement, wherein a quantity of the one or more channel state information processing units is based at least in part on at least one of a quantity of configured channel state information resources, a reporting type, or the timing.

Although Fig. 4 shows example blocks of process 400, in some aspects, process 400 may include additional blocks, fewer blocks, different blocks, or differently arranged blocks than those depicted in Fig. 4. Additionally, or alternatively, two or more of the blocks of process 400 may be performed in parallel.

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

As used herein, the term “component” is intended to be broadly construed as hardware, firmware, and/or a combination of hardware and software. As used herein, a processor is implemented in hardware, firmware, and/or a combination of hardware and software.

As used herein, satisfying a threshold may, depending on the context, refer to a value being greater than the threshold, greater than or equal to the threshold, less than the threshold, less than or equal to the threshold, equal to the threshold, not equal to the threshold, and/or the like.

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

Even though particular combinations of features are recited in the claims and/or disclosed in the specification, these combinations are not intended to limit the disclosure of various aspects. In fact, many of these features may be combined in ways not specifically recited in the claims and/or disclosed in the specification. Although each dependent claim listed below may directly depend on only one claim, the disclosure of various aspects includes each dependent claim in combination with every other claim in the claim set. A phrase referring to “at least one of” a list of items refers to any combination of those items, including single members. As an example, “at least one of: a, b, or c” is intended to cover a, b, c, a-b, a-c, b-c, and a-b-c, as well as any combination with multiples of the same element (e.g., a-a, a-a-a, a-a-b, a-a-c, a-b-b, a-c-c, b-b, b-b-b, b-b-c, c-c, and c-c-c or any other ordering of a, b, and c) .

No element, act, or instruction used herein should be construed as critical or essential unless explicitly described as such. Also, as used herein, the articles “a” and “an” are intended to include one or more items, and may be used interchangeably with “one or more. ” Furthermore, as used herein, the terms “set” and “group” are intended to include one or more items (e.g., related items, unrelated items, a combination of related and unrelated items, and/or the like) , and may be used interchangeably with “one or more. ” Where only one item is intended, the phrase “only one” or similar language is used. Also, as used herein, the terms “has, ” “have, ” “having, ” and/or the like are intended to be open-ended terms. Further, the phrase “based on” is intended to mean “based, at least in part, on” unless explicitly stated otherwise.

Claims

A method of wireless communication performed by a user equipment (UE) , comprising:

receiving, in a first set of symbols of a downlink channel, configuration information triggering an interference measurement resource (IMR) -only aperiodic channel state information report associated with a latency class of a plurality of latency classes;

performing, during at least a portion of a second set of symbols, a measurement of a channel state information reference signal based at least in part on receiving the configuration information triggering the IMR-only aperiodic channel state information report; and

transmitting, in a third set of symbols of an uplink channel, the IMR-only channel state information report based at least in part on performing the measurement, wherein a timing of the third set of symbols relative to the first set of symbols or the second set of symbols is based at least in part on the IMR-only aperiodic channel state information report and the latency class.
The method of claim 1, further comprising:

transmitting UE capability information identifying a capability of the UE; and

wherein receiving the configuration information triggering the IMR-only aperiodic channel state information report comprises:

receiving the configuration information triggering the IMR-only aperiodic channel state information report based at least in part on the capability of the UE.
The method of claim 1, wherein the plurality of latency classes includes at least one of:

an ultra-low latency class,

a low latency class, or

a high latency class.
The method of claim 1, wherein the latency class is based at least in part on at least one of:

a resource configuration,

a channel state information processing unit, or

a feedback frequency configuration.
The method of claim 1, wherein the latency class is based at least in part on a configuration of the IMR-only channel state information report.
The method of claim 5, wherein the configuration of the IMR-only channel state information report is aperiodically triggered without a transmission of a physical uplink shared channel including at least one of a transport block or a hybrid automatic repeat request acknowledgement message.
The method of claim 5, wherein the configuration of the IMR-only channel state information report is related to a quantity of occupied channel state information processing units.
The method of claim 5, wherein the configuration of the IMR-only channel state information report is related to at least one of: a quantity of channel state information reference signals with a wideband frequency-granularity or a quantity of channel state information reference signal ports in a single resource without a channel state information reference signal resource indicator report.
The method of claim 5, wherein the configuration of the IMR-only channel state information report is related to a resource configuration and a type of the IMR-only channel state information report.
The method of claim 1, wherein the timing is based at least in part on a quantity of symbols with a subcarrier configuration.
The method of claim 10, wherein the subcarrier configuration is based at least in part on a subcarrier spacing of at least one of:

a physical downlink control channel,

a physical uplink shared channel,

a channel state information interference measurement resource, or

a non-zero power channel state information reference signal.
The method of claim 1, further comprising:

processing, using one or more channel state information processing units of the UE, the measurement, wherein a quantity of the one or more channel state information processing units is based at least in part on at least one of a quantity of configured channel state information resources, a reporting type, or the timing.
A user equipment (UE) for wireless communication, comprising:

a memory; and

one or more processors operatively coupled to the memory, the memory and the one or more processors configured to:

receive, in a first set of symbols of a downlink channel, configuration information triggering an interference measurement resource (IMR) -only aperiodic channel state information report associated with a latency class of a plurality of latency classes;

perform, during at least a portion of a second set of symbols, a measurement of a channel state information reference signal based at least in part on receiving the configuration information triggering the IMR-only aperiodic channel state information report; and

transmit, in a third set of symbols of an uplink channel, the IMR-only channel state information report based at least in part on performing the measurement, wherein a timing of the third set of symbols relative to the first set of symbols or the second set of symbols is based at least in part on the IMR-only aperiodic channel state information report and the latency class.
The UE of claim 13, wherein the one or more processors are further configured to:

transmit UE capability information identifying a capability of the UE; and

wherein the one or more processors, when receiving the configuration information triggering the IMR-only aperiodic channel state information report, are configured to:

receive the configuration information triggering the IMR-only aperiodic channel state information report based at least in part on the capability of the UE.
The UE of claim 13, wherein the plurality of latency classes includes at least one of:

an ultra-low latency class,

a low latency class, or

a high latency class.
The UE of claim 13, wherein the latency class is based at least in part on at least one of:

a resource configuration,

a channel state information processing unit, or

a feedback frequency configuration.
The UE of claim 13, wherein the latency class is based at least in part on a configuration of the IMR-only channel state information report.
The UE of claim 17, wherein the configuration of the IMR-only channel state information report is aperiodically triggered without a transmission of a physical uplink shared channel including at least one of a transport block or a hybrid automatic repeat request acknowledgement message.
The UE of claim 17, wherein the configuration of the IMR-only channel state information report is related to a quantity of occupied channel state information processing units.
The UE of claim 17, wherein the configuration of the IMR-only channel state information report is related to at least one of: a quantity of channel state information reference signals with a wideband frequency-granularity or a quantity of channel state information reference signal ports in a single resource without a channel state information reference signal resource indicator report.
The UE of claim 17, wherein the configuration of the IMR-only channel state information report is related to a resource configuration and a type of the IMR-only channel state information report.
The UE of claim 13, wherein the timing is based at least in part on a quantity of symbols with a subcarrier configuration.
The UE of claim 22, wherein the subcarrier configuration is based at least in part on a subcarrier spacing of at least one of:

a physical downlink control channel,

a physical uplink shared channel,

a channel state information interference measurement resource, or

a non-zero power channel state information reference signal.
The UE of claim 13, wherein the one or more processors are further configured to:

process, using one or more channel state information processing units of the UE, the measurement, wherein a quantity of the one or more channel state information processing units is based at least in part on at least one of a quantity of configured channel state information resources, a reporting type, or the timing.
A non-transitory computer-readable medium storing one or more instructions for wireless communication, the one or more instructions comprising:

one or more instructions that, when executed by one or more processors of a user equipment, cause the one or more processors to:

receive, in a first set of symbols of a downlink channel, configuration information triggering an interference measurement resource (IMR) -only aperiodic channel state information report associated with a latency class of a plurality of latency classes;

perform, during at least a portion of a second set of symbols, a measurement of a channel state information reference signal based at least in part on receiving the configuration information triggering the IMR-only aperiodic channel state information report; and

transmit, in a third set of symbols of an uplink channel, the IMR-only channel state information report based at least in part on performing the measurement, wherein a timing of the third set of symbols relative to the first set of symbols or the second set of symbols is based at least in part on the IMR-only aperiodic channel state information report and the latency class.
The non-transitory computer-readable medium of claim 25, wherein the one or more instructions, when executed by the one or more processors, further cause the one or more processors to:

transmit UE capability information identifying a capability of the UE; and

wherein the one or more instructions, that cause the one or more processors to receive the configuration information triggering the IMR-only aperiodic channel state information report, cause the one or more processors to:

receive the configuration information triggering the IMR-only aperiodic channel state information report based at least in part on the capability of the UE.
The non-transitory computer-readable medium of claim 25, wherein the plurality of latency classes includes at least one of:

an ultra-low latency class,

a low latency class, or

a high latency class.
The non-transitory computer-readable medium of claim 25, wherein the latency class is based at least in part on at least one of:

a resource configuration,

a channel state information processing unit, or

a feedback frequency configuration.
The non-transitory computer-readable medium of claim 25, wherein the latency class is based at least in part on a configuration of the IMR-only channel state information report.
The non-transitory computer-readable medium of claim 29, wherein the configuration of the IMR-only channel state information report is aperiodically triggered without a transmission of a physical uplink shared channel including at least one of a transport block or a hybrid automatic repeat request acknowledgement message.
The non-transitory computer-readable medium of claim 29, wherein the configuration of the IMR-only channel state information report is related to a quantity of occupied channel state information processing units.
The non-transitory computer-readable medium of claim 29, wherein the configuration of the IMR-only channel state information report is related to at least one of: a quantity of channel state information reference signals with a wideband frequency-granularity or a quantity of channel state information reference signal ports in a single resource without a channel state information reference signal resource indicator report.
The non-transitory computer-readable medium of claim 29, wherein the configuration of the IMR-only channel state information report is related to a resource configuration and a type of the IMR-only channel state information report.
The non-transitory computer-readable medium of claim 25, wherein the timing is based at least in part on a quantity of symbols with a subcarrier configuration.
The non-transitory computer-readable medium of claim 34, wherein the subcarrier configuration is based at least in part on a subcarrier spacing of at least one of:

a physical downlink control channel,

a physical uplink shared channel,

a channel state information interference measurement resource, or

a non-zero power channel state information reference signal.
The non-transitory computer-readable medium of claim 25, wherein the one or more instructions, when executed by the one or more processors, further cause the one or more processors to:

process, using one or more channel state information processing units of the UE, the measurement, wherein a quantity of the one or more channel state information processing units is based at least in part on at least one of a quantity of configured channel state information resources, a reporting type, or the timing.
An apparatus for wireless communication, comprising:

means for receiving, in a first set of symbols of a downlink channel, configuration information triggering an interference measurement resource (IMR) -only aperiodic channel state information report associated with a latency class of a plurality of latency classes;

means for performing, during at least a portion of a second set of symbols, a measurement of a channel state information reference signal based at least in part on receiving the configuration information triggering the IMR-only aperiodic channel state information report; and

means for transmitting, in a third set of symbols of an uplink channel, the IMR-only channel state information report based at least in part on performing the measurement, wherein a timing of the third set of symbols relative to the first set of symbols or the second set of symbols is based at least in part on the IMR-only aperiodic channel state information report and the latency class.
The apparatus of claim 37, further comprising:

means for transmitting user equipment capability information identifying a capability of the apparatus; and

wherein the means for receiving the configuration information triggering the IMR-only aperiodic channel state information report comprises:

means for receiving the configuration information triggering the IMR-only aperiodic channel state information report based at least in part on the capability of the apparatus.
The apparatus of claim 37, wherein the plurality of latency classes includes at least one of:

an ultra-low latency class,

a low latency class, or

a high latency class.
The apparatus of claim 37, wherein the latency class is based at least in part on at least one of:

a resource configuration,

a channel state information processing unit, or

a feedback frequency configuration.
The apparatus of claim 37, wherein the latency class is based at least in part on a configuration of the IMR-only channel state information report.
The apparatus of claim 41, wherein the configuration of the IMR-only channel state information report is aperiodically triggered without a transmission of a physical uplink shared channel including at least one of a transport block or a hybrid automatic repeat request acknowledgement message.
The apparatus of claim 41, wherein the configuration of the IMR-only channel state information report is related to a quantity of occupied channel state information processing units.
The apparatus of claim 41, wherein the configuration of the IMR-only channel state information report is related to at least one of: a quantity of channel state information reference signals with a wideband frequency-granularity or a quantity of channel state information reference signal ports in a single resource without a channel state information reference signal resource indicator report.
The apparatus of claim 41, wherein the configuration of the IMR-only channel state information report is related to a resource configuration and a type of the IMR-only channel state information report.
The apparatus of claim 37, wherein the timing is based at least in part on a quantity of symbols with a subcarrier configuration.
The apparatus of claim 46, wherein the subcarrier configuration is based at least in part on a subcarrier spacing of at least one of:

a physical downlink control channel,

a physical uplink shared channel,

a channel state information interference measurement resource, or

a non-zero power channel state information reference signal.
The apparatus of claim 37, further comprising:

means for processing, using one or more channel state information processing units of the UE, the measurement, wherein a quantity of the one or more channel state information processing units is based at least in part on at least one of a quantity of configured channel state information resources, a reporting type, or the timing.