QCL assumptions for A-CSI-RS configured with multiple TRPs

Abstract

Certain aspects of the present disclosure provide techniques for quasi-co-location (QCL) assumptions for aperiodic channel state information (A-CSI) reference signals (RS) configured with multiple transmit-receive points (mTRPs). A user equipment (UE) may receive signaling configuring a plurality of index values associated with different control resource sets (CORESETs) for the UE. The UE may receive first downlink control information (DCI) from a base station (BS) triggering an A-CSI-RS resource set for A-CSI reporting. The first DCI is received in a first CORESET among the different CORESETs, the first CORESET being associated with a first index value among the plurality of index values. The UE may determine a first time offset between the first DCI and the A-CSI-RS resource set. When the first time offset is less than a threshold time offset, the UE may determine a QCL assumption for receiving the A-CSI-RS based at least in part on the first index value.

Description

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority to U.S. application No. 17 / 152,571, filed on January 29, 2021, which claims the benefit of and priority to U.S. Provisional Patent Application No. 62 / 976,309, filed on February 13, 2020, the entire contents of both applications are hereby incorporated by reference herein.

[0003] background

[0004] public domain

[0005] Various aspects of the present disclosure relate to wireless communications, and more particularly, to techniques for quasi-co-location (QCL) assumption of aperiodic channel state information (A-CSI) reference signals (RSs) configured with multiple transmit reception points (mTRPs).

[0006] Related technical description

[0007] Wireless communication systems are widely deployed to provide various telecommunication services such as telephony, video, data, messaging, broadcasts, etc. These 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, etc.). Examples of such multiple-access systems include 3rd Generation Partnership Project (3GPP) Long Term Evolution (LTE) systems, LTE-Advanced (LTE-A) systems, Code Division Multiple Access (CDMA) systems, Time Division Multiple Access (TDMA) systems, Frequency Division Multiple Access (FDMA) systems, Orthogonal Frequency Division Multiple Access (OFDMA) systems, Single Carrier Frequency Division Multiple Access (SC-FDMA) systems, and Time Division Synchronous Code Division Multiple Access (TD-SCDMA) systems, to name a few.

[0008] These multiple access technologies have been adopted in various telecommunication standards to provide a common protocol that enables different wireless devices to communicate at a city, country, region, and even global level. New radio (e.g., 5G NR) is an example of an emerging telecommunication standard. NR is an enhancement to the LTE mobile standard promulgated by 3GPP. NR is designed to better support mobile broadband Internet access by using OFDMA with a cyclic prefix (CP) on the downlink (DL) and uplink (UL) to improve spectrum efficiency, reduce costs, improve services, utilize new spectrum, and better integrate with other open standards. To this end, NR supports beamforming, multiple-input multiple-output (MIMO) antenna technology, and carrier aggregation.

[0009] However, as the demand for mobile broadband access continues to grow, there is a need for further improvements to NR and LTE technologies. Preferably, these improvements should also apply to other multiple access technologies and the telecommunication standards that employ them.

[0010] Overview

[0011] The systems, methods, and apparatus of the present disclosure each have several aspects, no single one of which is solely responsible for its desirable attributes. After considering this discussion, and particularly after reading the section entitled "Detailed Description," one will understand how the features of the present disclosure provide advantages including improvements and favorable quasi-co-location (QCL) assumptions for aperiodic channel state information (A-CSI) reference signals (RS) configured with multiple transmit receive points (mTRPs).

[0012] Certain aspects of the subject matter described in the present disclosure may be implemented in a method for wireless communication by a user equipment (UE). The method generally includes receiving signaling for configuring a plurality of index values associated with different control resource sets (CORESETs) for the UE. The method generally includes receiving first downlink control information (DCI) from a base station (BS) that triggers an A-CSI-RS resource set for A-CSI reporting. The first DCI is received in a first CORESET among different CORESETs, the first CORESET being associated with a first index value among a plurality of index values. The method generally includes determining a QCL hypothesis for receiving an A-CSI-RS using the A-CSI-RS resource set based at least in part on the first index value when a time offset between the first DCI and the A-CSI-RS resource set is less than a first threshold time offset.

[0013] Certain aspects of the subject matter described in this disclosure may be implemented in a method for wireless communication by a base station. The method generally includes configuring a user equipment (UE) with multiple index values associated with different core sets. The method generally includes sending a first directive communication (DCI) to the UE that triggers an A-CSI-RS resource set for A-CSI reporting. The first DCI is sent in a first core set among the different core sets. The first DCI is associated with a first index value among the multiple index values. The method generally includes determining a QCL hypothesis for transmitting an A-CSI-RS using the A-CSI-RS resource set based at least in part on the first index value when a time offset between the first DCI and the A-CSI-RS resource set is less than a first threshold time offset.

[0014] Certain aspects of the subject matter described in the present disclosure may be implemented in a method for wireless communication by a UE. The method generally includes identifying that a medium access control (MAC) control element (CE) received from a base station indicates that at least one transmission configuration indicator (TCI) code point is mapped to two TCI states. The method generally includes receiving a first DCI from the base station that triggers an A-CSI-RS resource set for A-CSI reporting. The method generally includes determining a QCL hypothesis for receiving an A-CSI-RS using the A-CSI-RS resource set based at least in part on identifying that the MAC-CE indicates that at least one TCI code point is mapped to two TCI states when a time offset between the first DCI and the A-CSI-RS resource set is less than a first threshold time offset.

[0015] Certain aspects of the subject matter described in this disclosure may be implemented in a method for wireless communication by a base station. The method generally includes identifying a MAC-CE sent to a UE indicating that at least one TCI code point is mapped to two TCI states. The method generally includes sending a first DCI to the UE that triggers an A-CSI-RS resource set for A-CSI reporting. The method generally includes determining a QCL hypothesis for transmitting an A-CSI-RS using the A-CSI-RS resource set based at least in part on identifying a MAC-CE indicating that at least one TCI code point is mapped to two TCI states when a time offset between the first DCI and the A-CSI-RS resource set is less than a first threshold time offset.

[0016] Certain aspects provide an apparatus for wireless communication. The apparatus generally includes means for receiving signaling configuring a plurality of index values associated with different CORESETs for the apparatus. The apparatus generally includes means for receiving, from a base station, a first DCI triggering an A-CSIRS resource set for A-CSI reporting, the first DCI being received in a first CORESET among the different CORESETs, the first CORESET being associated with a first index value among the plurality of index values. The apparatus generally includes means for determining, when a time offset between the first DCI and the A-CSI-RS resource set is less than a first threshold time offset, a QCL hypothesis for receiving an A-CSI-RS using the A-CSI-RS resource set based at least in part on the first index value associated with the first DCI.

[0017] Certain aspects provide an apparatus for wireless communication. The apparatus generally includes means for identifying that a MAC CE received from a base station indicates that at least one TCI code point is mapped to two TCI states. The apparatus generally includes means for receiving, from the base station, a first DCI triggering an A-CSI RS resource set for A-CSI reporting. The apparatus generally includes means for determining a QCL hypothesis for receiving an A-CSI-RS using the A-CSI-RS resource set based at least in part on identifying that the MAC CE indicates that at least one TCI code point is mapped to two TCI states when a time offset between the first DCI and the A-CSI-RS resource set is less than a first threshold time offset.

[0018] Certain aspects provide an apparatus for wireless communication. The apparatus generally includes means for configuring a plurality of index values associated with different core sets for a UE. The apparatus generally includes means for sending a first directive information communication (DCI) to the UE triggering an A-CSI RS resource set for A-CSI reporting, the first DCI being sent in a first core set among the different core sets, the first core set being associated with a first index value among the plurality of index values. The apparatus generally includes means for determining a quality of life (QCL) hypothesis for transmitting an A-CSI-RS using the A-CSI-RS resource set based at least in part on the first index value associated with the first DCI when a time offset between the first DCI and the A-CSI-RS resource set is less than a first threshold time offset.

[0019] Certain aspects provide an apparatus for wireless communication. The apparatus generally includes means for identifying that a MAC CE sent to a UE indicates that at least one TCI code point is mapped to two TCI states. The apparatus generally includes means for sending a first DCI to the UE triggering an A-CSI RS resource set for A-CSI reporting. The apparatus generally includes means for determining a QCL hypothesis for transmitting an A-CSI-RS using the A-CSI-RS resource set based at least in part on identifying that a MAC CE indicates that at least one TCI code point is mapped to two TCI states when a time offset between the first DCI and the A-CSI-RS resource is less than a first threshold time offset.

[0020] Certain aspects provide an apparatus for wireless communication. The apparatus generally includes at least one processor coupled to a memory. The memory includes code executable by the at least one processor to cause the apparatus to: receive signaling configuring the apparatus with multiple index values associated with different CORESETs; receive a first DCI from a base station (BS) triggering an A-CSI RS resource set for A-CSI reporting, the first DCI being received in a first CORESET among the different CORESETs, the first CORESET being associated with a first index value among the multiple index values; and determine, when a time offset between the first DCI and the A-CSI-RS resource set is less than a first threshold time offset, a QCL hypothesis for receiving an A-CSI-RS using the A-CSI-RS resource set based at least in part on the first index value associated with the first DCI.

[0021] Certain aspects provide an apparatus for wireless communication. The apparatus generally includes at least one processor coupled to a memory. The memory includes code executable by the at least one processor to cause the apparatus to: identify a MAC CE received from a base station indicating that at least one TCI code point is mapped to two TCI states; receive a first DCI from the base station triggering an A-CSI RS resource set for A-CSI reporting; and determine a QCL hypothesis for receiving an A-CSI-RS using the A-CSI-RS resource set based at least in part on identifying that the MAC CE indicates that at least one TCI code point is mapped to two TCI states when a time offset between the first DCI and the A-CSI-RS resource set is less than a first threshold time offset.

[0022] Certain aspects provide an apparatus for wireless communication. The apparatus generally includes at least one processor coupled to a memory. The memory includes code executable by the at least one processor to cause the apparatus to: configure a UE with multiple index values associated with different CORESETs; send a first DCI to the UE that triggers an A-CSI RS resource set for A-CSI reporting, the first DCI being sent in a first CORESET among the different CORESETs, the first CORESET being associated with a first index value among the multiple index values; and determine, when a time offset between the first DCI and the A-CSI-RS resource set is less than a first threshold time offset, a QCL hypothesis for transmitting an A-CSI-RS using the A-CSI-RS resource set based at least in part on the first index value associated with the first DCI.

[0023] Certain aspects provide an apparatus for wireless communication. The apparatus generally includes at least one processor coupled to a memory. The memory includes code executable by the at least one processor to cause the apparatus to: identify a MAC CE sent to a UE indicating that at least one TCI code point is mapped to two TCI states; send a first DCI to the UE triggering an A-CSI RS resource set for A-CSI reporting; and determine a QCL hypothesis for transmitting an A-CSI-RS using the A-CSI-RS resource set based at least in part on identifying the MAC CE indicating that at least one TCI code point is mapped to two TCI states when a time offset between the first DCI and the A-CSI-RS resource set is less than a first threshold time offset.

[0024] Certain aspects provide a computer-readable medium having code stored thereon for wireless communication by a UE. The code is executable by at least one processor to cause the UE to: receive signaling configuring a plurality of index values associated with different CORESETs for the UE; receive a first DCI from a base station (BS) triggering an A-CSIRS resource set for A-CSI reporting, the first DCI being received in a first CORESET among the different CORESETs, the first CORESET being associated with a first index value among the plurality of index values; and determine, when a time offset between the first DCI and the A-CSI-RS resource set is less than a first threshold time offset, a QCL hypothesis for receiving an A-CSI-RS using the A-CSI-RS resource set based at least in part on the first index value associated with the first DCI.

[0025] Certain aspects provide a non-transitory computer-readable medium having stored thereon code for wireless communication by a UE. The code is executable by at least one processor to cause the UE to: identify that a MAC CE received from a base station indicates that at least one TCI code point is mapped to two TCI states; receive a first DCI from the base station triggering an aperiodic A-CSI RS resource set for A-CSI reporting; and determine, when a time offset between the first DCI and the A-CSI-RS resource set is less than a first threshold time offset, a QCL hypothesis for receiving an A-CSI-RS using the A-CSI-RS resource set based at least in part on identifying that the MAC CE indicates that at least one TCI code point is mapped to two TCI states.

[0026] Certain aspects provide a non-transitory computer-readable medium having stored thereon code for wireless communication by a base station. The code is executable by at least one processor to cause the base station to: configure a user equipment (UE) with multiple index values associated with different core sets; send a first directive (DCI) to the UE triggering an A-CSIRS resource set for A-CSI reporting, the first DCI being sent in a first core set among the different core sets, the first core set being associated with a first index value of the multiple index values; and determine, when a time offset between the first DCI and the A-CSI-RS resource set is less than a first threshold time offset, a quality level (QCL) hypothesis for transmitting an A-CSI-RS using the A-CSI-RS resource set based at least in part on the first index value associated with the first DCI.

[0027] Certain aspects provide a non-transitory computer-readable medium having stored thereon code for wireless communication by a base station. The code is executable by at least one processor to cause the base station to: identify a MAC CE sent to a UE indicating that at least one TCI code point is mapped to two TCI states; send a first DCI to the UE triggering an A-CSI RS resource set for A-CSI reporting; and when a time offset between the first DCI and the A-CSI-RS resource set is less than a first threshold time offset, determine a QCL hypothesis for transmitting an A-CSI-RS using the A-CSI-RS resource set based at least in part on identifying that the MAC CE indicates that at least one TCI code point is mapped to two TCI states.

[0028] To accomplish the foregoing and related ends, one or more aspects comprise the features hereinafter fully described and particularly pointed out in the claims. The following description and accompanying drawings set forth in detail certain illustrative features of the one or more aspects. However, these features are indicative of but a few of the various ways in which the principles of the various aspects may be employed. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order that the manner in which the above-recited features of the present disclosure may be understood in detail, a more particular description of the content briefly summarized above may be obtained by reference to various aspects, some of which are illustrated in the accompanying drawings. It should be noted, however, that the accompanying drawings illustrate only certain typical aspects of the disclosure and are therefore not to be considered limiting of its scope, as the description may admit to other equally effective aspects.

[0031] Figure 1 is a block diagram conceptually illustrating an example telecommunications system in accordance with certain aspects of the present disclosure.

[0032] Figure 2 is a block diagram conceptually illustrating designs of example base stations (BSs) and user equipment (UEs) in accordance with certain aspects of the present disclosure.

[0033] Figure 3 is an example frame format for certain wireless communication systems (e.g., New Radio (NR)) in accordance with certain aspects of the present disclosure.

[0034] Figure 4 is a call flow diagram illustrating example signaling for a single transmit reception point (TRP) physical downlink shared channel (PDSCH) quasi co-location (QCL) assumption in accordance with certain aspects of the present disclosure.

[0035] Figure 5A is a call flow diagram illustrating example signaling for multiple downlink control information (DCI) multiple TRP (mTRP) PDSCH QCL assumptions in accordance with certain aspects of the present disclosure.

[0036] Figure 5B is an example mDCImTRP scenario according to certain aspects of the present disclosure.

[0037] Figure 5C is an example default QCL assumption for mDCI mTRP on PDSCH in accordance with certain aspects of the present disclosure.

[0038] Figure 6A is a call flow diagram illustrating example signaling for a single DCI mTRP PDSCH QCL assumption in accordance with certain aspects of the present disclosure.

[0039] Figure 6B is an example single DCImTRP scenario according to certain aspects of the present disclosure.

[0040] Figure 6C is an example single DCImTRP scenario with spatial division multiplexing (SDM) of TRP according to certain aspects of the present disclosure.

[0041] Figure 6D is an example single DCImTRP scenario with frequency division multiplexing (FDM) of TRP according to certain aspects of the present disclosure.

[0042] Figure 6E is an example single DCImTRP scenario with time division multiplexing (TDM) of TRP according to certain aspects of the present disclosure.

[0043] Figure 6F is an example default QCL assumption for a single DCI mTRP on PDSCH in accordance with aspects of the present disclosure.

[0044] Figure 7A is a call flow diagram illustrating example signaling for a single TRP aperiodic channel state information (A-CSI) reference signal (RS) QCL assumption in accordance with certain aspects of the present disclosure.

[0045] Figure 7B is an example mapping of TCI state configurations to trigger states according to certain aspects of the present disclosure.

[0046] Figure 8 is a call flow diagram illustrating example signaling for multi-DCI mTRP A-CSI-RS QCL assumption in accordance with certain aspects of the present disclosure.

[0047] Figure 9 is a flow diagram illustrating example operations for wireless communications by a UE, in accordance with certain aspects of the present disclosure.

[0048] Figure 10 is a flow diagram illustrating example operations for wireless communications by a BS, in accordance with certain aspects of the present disclosure.

[0049] Figure 11 is a call flow diagram illustrating example signaling for a single DCImTRP A-CSI-RS QCL assumption in accordance with certain aspects of the present disclosure.

[0050] Figure 12 is a flow diagram illustrating example operations for wireless communications by a UE, in accordance with certain aspects of the present disclosure.

[0051] Figure 13 is a flow diagram illustrating example operations for wireless communications by a BS, in accordance with certain aspects of the present disclosure.

[0052] Figure 14 Illustrated is a communications device that may include various components configured to perform operations for the techniques disclosed herein, in accordance with certain aspects of the present disclosure.

[0053] Figure 15 Illustrated is a communications device that may include various components configured to perform operations for the techniques disclosed herein, in accordance with certain aspects of the present disclosure.

[0054] To facilitate understanding, identical reference numerals have been used, where possible, to designate identical elements that are common to the figures. It is contemplated that elements disclosed in one aspect may be beneficially utilized in other aspects without specific recitation.

[0055] Detailed description

[0056] Aspects of the present disclosure provide apparatus, methods, processing systems, and computer-readable media for quasi-co-location (QCL) assumption of aperiodic channel state information (A-CSI) reference signals (RSs) configured with multiple transmit reception points (mTRPs).

[0057] In some systems, A-CSI reports can be configured and associated with an A-CSI-RS resource set. In some examples, the A-CSI reports are configured with an mTRP. What is needed is a technique for determining the QCL assumption with respect to the A-CSI-RS, for example, in scenarios where a UE supports simultaneous reception using two beams and two default QCL assumptions.

[0058] The following description provides an example of a QCL assumption for an A-CSI-RS configured with mTRP in a communication system. Changes may be made to the functions and arrangements of the elements discussed without departing from the present disclosure. Various examples may omit, replace, or add various procedures or components as appropriate. For example, the described methods may be performed in an order different from the order described, and various steps may be added, omitted, or combined. Moreover, the features described with reference to some examples may be combined in some other examples. For example, an apparatus or method may be implemented using any number of the aspects described herein. In addition, the present disclosure is intended to cover such apparatus or methods that are practiced using other structures, functionalities, or structures and functionalities that are supplementary to or in addition to the various aspects of the present disclosure described herein. It should be understood that any aspect of the present disclosure disclosed herein may be implemented by one or more elements of the claims. The word "exemplary" is used herein to mean "used as an example, instance, or illustration." Any aspect described herein as "exemplary" is not necessarily to be construed as being superior to or superior to other aspects.

[0059] In general, any number of wireless networks may be deployed in a given geographic area. Each wireless network may support a specific radio access technology (RAT) and may operate on one or more frequencies. A RAT may also be referred to as a radio technology, air interface, etc. A frequency may also be referred to as a carrier, subcarrier, frequency channel, tone, subband, etc. Each frequency may support a single RAT in a given geographic area to avoid interference between wireless networks of different RATs.

[0060] The techniques described herein can be used for various wireless networks and radio technologies. Although various aspects may be described herein using terms typically associated with 3G, 4G, and / or new radio (e.g., 5G New Radio (NR)) wireless technologies, various aspects of the present disclosure may be applied in communication systems based on other generations.

[0061] Example Telecommunications System

[0062] NR access can support various wireless communication services, such as enhanced mobile broadband (eMBB) targeting wide bandwidth (e.g., 80 MHz or above), millimeter wave (mmW) targeting high carrier frequency (e.g., 25 GHz or above), massive machine type communication (MTC) targeting non-backward compatible MTC technology, and / or mission-critical services targeting ultra-reliable low latency communication (URLLC). These services may include latency and reliability requirements. These services may also have different transmission time intervals (TTIs) to meet corresponding quality of service (QoS) requirements. In addition, these services can coexist in the same subframe.

[0063] NR supports beamforming and the beam direction can be dynamically configured. Multiple-input multiple-output (MIMO) transmission with precoding can also be supported. MIMO configurations in the downlink (DL) can support up to 8 transmit antennas (with multi-layer DL transmission of up to 8 streams) and up to 2 streams per UE. Multi-layer transmission of up to 2 streams per UE can be supported. Aggregation of multiple cells can be supported using up to 8 serving cells.

[0064] Figure 1 An example wireless communication network 100 is illustrated in which aspects of the present disclosure may be performed. For example, the wireless communication network 100 may be a NR system (e.g., a 5G NR network). Figure 1 As shown, the wireless communication network 100 may be in communication with a core network 132. The core network 132 may be in communication with one or more base stations (BSs) 110a-z (each also individually referred to herein as BS 110 or collectively referred to herein as BS 110) and / or user equipments (UEs) 120a-y (each also individually referred to herein as UE 120 or collectively referred to herein as UE 120) in the wireless communication network 100 via one or more interfaces.

[0065] According to certain aspects, BS 110 and UE 120 may be configured for aperiodic channel state information (A-CSI) reporting with multiple transmit / receive points (mTRPs). Figure 1 As shown in FIG, according to aspects of the present disclosure, a BS 110a includes a beam manager 112 that can be configured to assume QCL for A-CSI RSs configured with mTRP. According to aspects of the present disclosure, a UE 120a includes a beam manager 122 that can be configured to assume QCL for A-CSI RSs configured with mTRP.

[0066] BS 110 may provide communication coverage for a particular geographic area (sometimes referred to as a "cell"), which may be stationary or mobile depending on the location of mobile BS 110. In some examples, BS 110 may interconnect with each other and / or one or more other BSs or network nodes (not shown) in wireless communication network 100 via various types of backhaul interfaces (e.g., direct physical connections, wireless connections, virtual networks, etc.) using any suitable transport network. Figure 1 In the example shown in FIG, BSs 110a, 110b, and 110c may be macro BSs for macro cells 102a, 102b, and 102c, respectively. BS 110x may be a pico BS for pico cell 102x. BSs 110y and 110z may be femto BSs for femto cells 102y and 102z, respectively. A BS may support one or more cells.

[0067] BS 110 communicates with UEs 120a-y (each also individually referred to herein as UE 120 or collectively referred to herein as UE 120) in the wireless communication network 100. UEs 120 (e.g., 120x, 120y, etc.) may be dispersed throughout the wireless communication network 100, and each UE 120 may be stationary or mobile. The wireless communication network 100 may also include relay stations (e.g., relay station 110r) (also referred to as relays, etc.) that receive transmissions of data and / or other information from an upstream station (e.g., BS 110a or UE 120r) and send transmissions of the data and / or other information to a downstream station (e.g., UE 120 or BS 110), or that relay transmissions between UEs 120 to facilitate communication between the devices.

[0068] The network controller 130 may communicate with a set of BSs 110 and provide coordination and control (e.g., via a backhaul) for the BSs 110. In various aspects, the network controller 130 may be in communication with a core network 132 (e.g., a 5G core network (5GC)), which provides various network functions such as access and mobility management, session management, user plane functions, policy control functions, authentication server functions, unified data management, application functions, network exposure functions, network repository functions, network slice selection functions, etc.

[0069] Figure 2 Illustrated are BS 110a and UE 120a (eg, in Figure 1 Example components of the wireless communication network 100).

[0070] At BS 110a, transmit processor 220 may receive data from data source 212 and control information from controller / processor 240. The control information may be for a physical broadcast channel (PBCH), a physical control format indicator channel (PCFICH), a physical hybrid ARQ indicator channel (PHICH), a physical downlink control channel (PDCCH), a group common PDCCH (GC PDCCH), etc. The data may be for a physical downlink shared channel (PDSCH), etc. A medium access control (MAC)-control element (MAC-CE) is a MAC layer communication structure that may be used for the exchange of control commands between wireless nodes. The MAC-CE may be carried in a shared channel, such as the PDSCH, the physical uplink shared channel (PUSCH), or the physical sidelink shared channel (PSSCH).

[0071] The transmit processor 220 may process (e.g., encode and symbol map) data and control information to obtain data symbols and control symbols, respectively. The transmit processor 220 may also generate reference symbols (such as for the primary synchronization signal (PSS), secondary synchronization signal (SSS), and channel state information reference signal (CSI-RS)). The transmit multiple-input multiple-output (MIMO) processor 230 may perform spatial processing (e.g., precoding) on the data symbols, control symbols, and / or reference symbols, as applicable, and may provide output symbol streams to modulators (MODs) 232a-232t in the transceiver. Each MOD 232 in the transceiver may process a respective output symbol stream (e.g., for OFDM, etc.) to obtain an output sample stream. Each MOD 432 in the transceiver may further process (e.g., convert to analog, amplify, filter, and upconvert) the output sample stream to obtain a downlink (DL) signal. DL signals from MODs 232a-232t in the transceiver may be transmitted via antennas 234a-234t, respectively.

[0072] At UE 120a, antennas 252a-252r may receive the downlink signals from BS 110a and may provide received signals to demodulators (DEMODs) 254a-254r, respectively, within the transceiver. Each DEMOD 254 within the transceiver may condition (e.g., filter, amplify, downconvert, and digitize) its respective received signals to obtain input samples. Each DEMOD 454 within the transceiver may further process the input samples (e.g., for OFDM, etc.) to obtain received symbols. A MIMO detector 256 may obtain received symbols from all DEMODs 254a-254r within the transceiver, perform MIMO detection on the received symbols where applicable, and provide detected symbols. A receive processor 258 may process (e.g., demodulate, deinterleave, and decode) the detected symbols, provide decoded data for UE 120a to a data sink 260, and provide decoded control information to a controller / processor 280.

[0073] On the uplink (UL), at UE 120a, a transmit processor 264 may receive and process data from a data source 262 (e.g., for the PUSCH) and control information from a controller / processor 280 (e.g., for the physical uplink control channel (PUCCH)). The transmit processor 264 may also generate reference symbols for reference signals (e.g., the sounding reference signal (SRS)). The symbols from the transmit processor 264 may be precoded by a transmit MIMO processor 266, if applicable, further processed by DEMODs 254a-254r in the transceiver (e.g., for SC-FDM, etc.), and transmitted to BS 110a. At BS 110a, the UL signal from UE 120a may be received by antenna 234, processed by MOD 232 in the transceiver, detected by MIMO detector 236, if applicable, and further processed by receive processor 238 to obtain decoded data and control information sent by UE 120a. Receive processor 238 may provide decoded data to data sink 239 and decoded control information to controller / processor 240 .

[0074] Memories 242 and 282 may store data and program codes for BS 110a and UE 120a, respectively.A scheduler 244 may schedule UEs for data transmission on the DL and / or UL.

[0075] The antennas 252, processors 266, 258, 264, and / or controller / processor 280 of the UE 120a, and / or the antennas 234, processors 220, 230, 238, and / or controller / processor 240 of the BS 110a may be used to perform the various techniques and methods described herein. Figure 2As shown in FIG, in accordance with various aspects described herein, the controller / processor 240 of the BS 110a has a beam manager 241 that can be configured to use QCL assumptions for A-CSI-RS configured with mTRP. Figure 2 As shown in FIG, the controller / processor 280 of the UE 120a has a beam manager 281 that can be configured to use QCL assumptions for A-CSI-RS configured with mTRP in accordance with various aspects described herein. Although shown at the controller / processor, other components of the UE 120a and the BS 110a can also be used to perform the operations described herein.

[0076] NR can utilize orthogonal frequency division multiplexing (OFDM) with a cyclic prefix (CP) on both the UL and DL. NR can support half-duplex operation using time division duplexing (TDD). OFDM and single-carrier frequency division multiplexing (SC-FDM) divide the system bandwidth into multiple orthogonal subcarriers, often referred to as tones, bins, etc. Each subcarrier can be modulated with data. Modulation symbols can be sent in the frequency domain with OFDM and in the time domain with SC-FDM. The spacing between adjacent subcarriers can be fixed, and the total number of subcarriers can depend on the system bandwidth. The minimum resource allocation (so-called resource block (RB)) can be 12 contiguous subcarriers. The system bandwidth can also be divided into subbands. For example, a subband can cover multiple RBs. NR can support a base subcarrier spacing (SCS) of 15 kHz, and other SCSs (e.g., 30 kHz, 60 kHz, 120 kHz, 240 kHz, etc.) can be defined relative to the base SCS.

[0077] Figure 3 3 is a diagram illustrating an example of a frame format 300 for NR. The transmission timeline for each of the DL and UL can be divided into units of radio frames. Each radio frame can have a predetermined duration (e.g., 10 ms) and can be divided into 10 subframes with indices 0 to 9, each subframe being 1 ms. Each subframe can contain a variable number of slots (e.g., 1, 2, 4, 8, 16, ... slots), depending on the SCS. Each slot can include a variable number of symbol periods (e.g., 7 or 14 symbols), depending on the SCS. The symbol periods in each slot can be assigned an index. The subslot structure refers to a transmission time interval with a duration less than a slot (e.g., 2, 3, or 4 symbols). Each symbol in a slot can indicate the link direction used for data transmission (e.g., DL, UL, or flexible), and the link direction used for each subframe can be dynamically switched. The link direction can be based on the slot format. Each slot can include DL / UL data and DL / UL control information.

[0078] In NR, synchronization signal blocks (SSBs) are transmitted. In certain aspects, each SSB may be transmitted in a burst, where each SSB in the burst corresponds to a different beam direction for UE-side beam management (e.g., including beam selection and / or beam refinement). The SSBs include the PSS, SSS, and the two-symbol PBCH. The SSBs may be transmitted at fixed slot locations (such as Figure 3 ) is transmitted in the codeword 0-3 shown in . PSS and SSS can be used by UE for cell search and acquisition. PSS can provide half-frame timing, and SS can provide CP length and frame timing. PSS and SSS can provide cell identity. PBCH carries some basic system information, such as downlink system bandwidth, timing information within the radio frame, SS burst set periodicity, system frame number, etc. SSB can be organized into SS bursts to support beam sweeping. Further system information (such as remaining minimum system information (RMSI), system information block (SIB), other system information (OSI)) can be transmitted on the physical downlink shared channel (PDSCH) in certain subframes. SSB can be transmitted up to 64 times, for example, up to 64 different beam directions for millimeter waves. Multiple transmissions of SSB are called SS burst sets. SSBs in an SS burst set can be transmitted in the same frequency region, while SSBs in different SS burst sets can be transmitted in different frequency regions.

[0079] Example CSI reporting configuration

[0080] Channel state information (CSI) may refer to the channel properties of a communication link. CSI may represent, for example, the combined effects of scattering, fading, and power loss over the distance between the transmitter and receiver. Channel estimation using pilot signals, such as CSI reference signals (CSI-RS), may be performed to determine these effects on the channel. CSI can be used to adapt transmissions based on current channel conditions, which is useful for achieving reliable communication, particularly at high data rates in multi-antenna systems. CSI is typically estimated at the receiver, quantized, and fed back to the transmitter.

[0081] UE (for example, such as Figure 1 UE 120a in the wireless communication network 100 may be connected to a BS (e.g., Figure 1 The BS 110 in the radio communication network 100 is configured to perform CSI reporting. The BS may configure the UE with one CSI reporting configuration or with multiple CSI reporting configurations. The BS may provide the CSI reporting configuration to the UE via higher layer signaling, such as radio resource control (RRC) signaling (e.g., via CSI-ReportConfig information element (IE)).

[0082] Each CSI reporting configuration can be associated with a single downlink (DL) bandwidth part (BWP). A CSI reporting configuration can define the CSI reporting band as a subset of each subband of the BWP. The DL BWP can be indicated by a higher-layer parameter (e.g., bwp-Id) for channel measurement (CM) in the CSI reporting configuration and contains parameters for one CSI reporting band, such as the codebook configuration, time domain behavior, frequency granularity of the CSI, measurement constraint configuration, and CSI-related parameters to be reported by the UE. Each CSI resource setting can be located in a DL BWP identified by a higher-layer parameter, and all CSI resource settings can be linked to a CSI reporting configuration with the same DL BWP.

[0083] The CSI report configuration can configure the time and frequency resources used by the UE to report CSI. For example, the CSI report configuration can be associated with the CSI-RS resources used for CM, interference measurement (IM), or both. The CSI report configuration can configure the CSI-RS resources used for measurement (for example, via CSI-ResourceConfig IE (CSI-resource configuration IE)). The CSI-RS resources provide the UE with a configuration of CSI-RS ports or CSI-RS port groups mapped to time and frequency resources (for example, resource elements (REs)). The CSI-RS resources can be zero power (ZP) or non-zero power (NZP) resources. At least one NZP CSI-RS resource can be configured for CM. For interference measurement, it can be NZP CSI-RS or zero power CSI-RS, which is called CSI-IM (note that if it is NZP CSI-RS, it is called NZP CSI-RS for interference measurement, and if it is zero power, it is called CSI-IM).

[0084] The CSI reporting configuration may configure the UE for aperiodic, periodic or semi-persistent CSI reporting. For periodic CSI, the UE may be configured with periodic CSI-RS resources. Periodic CSI and semi-persistent CSI reporting on the physical uplink control channel (PUCCH) may be triggered via RRC or media access control (MAC) control elements (CEs). For aperiodic and semi-persistent CSI on the physical uplink shared channel (PUSCH), the BS may signal a CSI report trigger to the UE, which instructs the UE to send a CSI report for one or more CSI-RS resources, or configure the CSI-RS report trigger state (e.g., CSI-AperiodicTriggerStateList and CSI-SemiPersistentOnPUSCH-TriggerStateList). The CSI report trigger for aperiodic CSI and semi-persistent CSI on PUSCH may be provided via downlink control information (DCI). A CSI-RS trigger may be signaling to the UE indicating that a CSI-RS will be transmitted for a CSI-RS resource. The UE may report CSI feedback based on the CSI reporting configuration and the CSI reporting trigger. For example, the UE may measure the channel associated with the CSI of the triggered CSI-RS resource. Based on this measurement, the UE may select a preferred CSI-RS resource. The UE reports CSI feedback for the selected CSI-RS resource.

[0085] The CSI report configuration may also configure the CSI parameters (sometimes referred to as quantities) to be reported. Codebooks may include Type I single-panel, Type I multi-panel, and Type II single-panel. Regardless of the codebook used, the CSI report may include at least the channel quality indicator (CQI), precoding matrix indicator (PMI), CSI-RS resource indicator (CRI), and rank indicator (RI). The structure of the PMI may vary based on the codebook. CRI, RI, and CQI may be in the first part (Part I) of the CSI report, while the PMI may be in the second part (Part II).

[0086] For a type 1 single-panel codebook, the PMI may include the W1 matrix (e.g., a subset of beams) and the W2 matrix (e.g., a phase for cross-polarization combining and beam selection). For a type 1 multi-panel codebook, the PMI further includes a phase for cross-panel combining compared to a type 1 single-panel codebook. The BS may have multiple transmit beams. The UE may feed back the index of one or more preferred beams of the candidate beams to the BS. For example, the UE may feed back the precoding vector w for layer l:

[0087]

[0088] where b represents the oversampled beams (e.g., discrete Fourier transform (DFT) beams) for both polarizations (pol), and It is a co-determined phase.

[0089] For a Type II codebook (e.g., which may be designed for a single panel), the PMI is a linear combination of beams; it has a subset of orthogonal beams to be used for the linear combination, and for each beam, has a per-layer, per-polarization amplitude and phase. The preferred precoder for a layer may be a combination of a beam and an associated quantization coefficient, and the UE may feed back the selected beam and coefficients to the BS.

[0090] The UE may report CSI feedback based on the CSI reporting configuration and CSI reporting trigger. For example, the UE may measure the channel associated with the CSI of the triggered CSI-RS resource. Based on this measurement, the UE may select a preferred CSI-RS resource. The UE reports CSI feedback for the selected CSI-RS resource. The LI may be conditioned on the reported CQI, PMI, RI, and CRI; the CQI may be conditioned on the reported PMI, RI, and CRI; the PMI may be conditioned on the reported RI and CRI; and the RI may be conditioned on the reported CRI.

[0091] Example mTRP

[0092] In some wireless systems, transmissions may be transmitted via multiple transmission configuration indicator (TCI) states. In some examples, TCI states are associated with beam pairs, antenna panels, antenna ports, antenna port groups, quasi-co-located (QCL) relationships, and / or transmit-receive points (TRPs). Multi-TCI state transmissions may be associated with multiple beam pairs, multiple antenna panels, and / or multiple QCL relationships, which may be associated with one or more TRPs (mTRPs). The TCI state indicates the QCL assumptions that a user equipment (UE) may use for channel estimation.

[0093] In some examples, the TCI state may generally indicate to the UE an association between a downlink (DL) reference signal and a corresponding QCL type, which may allow the UE to determine a receive beam to be used to receive a transmission. A QCL type may be associated with a combination of QCL parameters (e.g., a QCL parameter set). In some examples, QCL-Type A indicates that the port is QCL with respect to Doppler shift, Doppler spread, average delay, and delay spread; QCL-Type B indicates that the port is QCL with respect to Doppler shift and Doppler spread; QCL-Type C indicates that the port is QCL with respect to average delay and Doppler shift; and QCL-Type D indicates that the port is QCL with respect to spatial Rx parameters. Different port groups may share different QCL parameter sets.

[0094] In some examples, for a multi-TCI state scenario, the same transport block (TB) / code block (CB) (e.g., the same information bits, but may be different decoded bits) is transmitted from multiple TCI states (such as two or more TRPs in a multi-TRP scenario). The UE considers transmissions from two TCI states and decodes these transmissions jointly. In some examples, the transmissions from these TCI states are at the same time (e.g., in the same time slot, mini-time slot, and / or in the same codeword), but across different resource blocks (RBs) and / or different layers. The number of layers from each TCI state may be the same or different. In some examples, for mTRP transmissions of the same codeword (i.e., the same transport block / code block), the modulation order may be the same. For mTRP transmissions involving different codewords (e.g., two codewords from two TRPs), each codeword may be associated with a rank, modulation, and resource allocation (e.g., referred to as multi-DCI based mTRP transmissions). In some examples, transmissions from these TCI states may be at different times (e.g., in two consecutive mini-slots or slots). In some examples, transmissions from a TRP may be a combination of the above.

[0095] Example QCL assumptions for single-TRP PDSCH

[0096] Figure 4 is a call flow diagram illustrating example signaling 400 for a single transmission reception point (TRP) physical downlink shared channel (PDSCH) quasi co-location (QCL) assumption.

[0097] In some wireless systems (e.g., Release 15 systems), multiple (e.g., up to 8) transmission configuration indicator (TCI) states may be activated for PDSCH. Figure 4As shown in FIG, at 406, a user equipment (UE) 402 receives downlink control information (DCI) (where the last symbol of the DCI is at t1) scheduling a PDSCH (where the first symbol of the PDSCH is at t2) from a base station (BS) 404. The TCI field in the DCI may indicate the TCI state for the scheduled PDSCH.

[0098] UE 402 may apply the indicated TCI state or the default QCL assumption based on whether the time duration between the scheduled PDSCH and the DCI satisfies a threshold. For example, the threshold may be a "timeDurationForQCL" threshold. UE 402 may report this threshold (e.g., 14 or 28 OFDM symbols) to BS 404 as a UE capability.

[0099] like Figure 4 As shown in FIG, if UE 402 determines at 408a that the time offset between the reception of the DCI and the corresponding PDSCH is equal to or greater than a threshold (e.g., timeDurationForQCL), UE 402 may apply the TCI state indicated in the DCI to the PDSCH at 410a. For example, at 412, UE 402 may determine a receive beam for receiving the PDSCH based on the indicated TCI state. This may be because UE 402 has sufficient time to decode the DCI and prepare a beam based on the TCI state indicated in the DCI before receiving the PDSCH.

[0100] If the UE 402 determines at 408b that the time offset is less than a threshold (eg, timeDurationForQCL), the UE 402 applies a default QCL assumption (eg, QCL-TypeD) to the PDSCH at 410b. For example, at 412, the UE 402 may determine a receive beam for receiving the PDSCH based on the default QCL.

[0101] The default QCL assumption on PDSCH may be the QCL / TCI state of the CORESET with the lowest control resource set (CORESET) identifier (ID) associated with the monitored search space in the most recent timeslot in which the UE 402 monitored one or more CORESETs within the active bandwidth part (BWP) of the serving cell.

[0102] In other words, if all TCI code points are mapped to a single TCI state and the offset between the reception of downlink (DL) DCI and the corresponding PDSCH is less than the threshold timeDurationForQCL, the UE 402 can assume that the demodulation reference signal (DM-RS) ports of the PDSCH of the serving cell are quasi-co-located (in QCL) with the RS with respect to the QCL parameters of the PDCCH QCL indication for the CORESET with the lowest controlResourceSetId associated with the monitored search space in the most recent time slot in which the UE 402 monitors one or more CORESETs within the active BWP of the serving cell.

[0103] At 414, UE 402 receives the PDSCH from BS 404 using the determined receive beam (at t2).

[0104] Example QCL assumptions for mDCI mTRP PDSCH

[0105] Figure 5A is a call flow diagram illustrating example signaling 500 for a multiple downlink control information (mDCI) multiple transmit reception point (mTRP) physical downlink shared channel (PDSCH) quasi co-location (QCL) assumption.

[0106] In some wireless systems (e.g., Release 16 systems), PDSCH may be transmitted by multiple TRPs and scheduled by multiple DCIs. Figure 5B As shown in , a first DCI (e.g., DCI1) transmitted from a first TRP (e.g., TRP1 504 associated with a base station (BS)) schedules a first PDSCH (e.g., PDSCH1) from the first TRP, and a second DCI (e.g., DCI2) transmitted from a second TRP (e.g., TRP2) schedules a second PDSCH (e.g., PDSCH2) from the second TRP.

[0107] The TRP differentiation on the user equipment (UE) side may be based on an index value associated with the DCI. For example, the UE 502 may receive a configuration of the index value. Figure 5AAs shown in FIG, at 506, UE 502 receives a configuration (e.g., a PDCCH-config RRC parameter) with an index value (e.g., a CORESETPoolIndex value) from TRP 1 504 (or TRP 2 or both). Each control resource set (CORESET) (e.g., up to 5 CORESETs) can be configured with a CORESETPoolIndex value, which can be 0 or 1. Thus, the CORESETs can be divided into two groups (e.g., a CORESET group associated with a CORESETPoolIndex value of 0 and a CORESET group associated with a CORESETPoolIndex value of 1).

[0108] like Figure 5A As shown in FIG, at 508, UE 502 receives a DCI (at t1) from the BS that schedules the PDSCH (at t2). The DCI may indicate the transmission configuration indicator (TCI) state of the scheduled PDSCH. The DCI may be in a state that is consistent with one of the CORESETPoolIndex values (e.g., Figure 5A In the example shown in FIG, 1 , the UE receives the DCI from a CORESET associated with the CORESET (0 in the example). Thus, the UE knows the CORESET and CORESETPoolIndex value associated with the DCI. The CORESETPoolIndex value of the CORESET in which the DCI is received can be used for various purposes, such as hybrid automatic repeat request (HARQ)-Ack codebook construction and transmission, PDSCH scrambling, and so on.

[0109] The UE 502 may apply the indicated TCI state or the default QCL assumption based on whether the time duration between the scheduled PDSCH and the DCI satisfies a threshold. For example, the threshold may be a "timeDurationForQCL" threshold. The UE 502 may report this threshold (e.g., 14 or 28 OFDM symbols) to the BS as a UE capability.

[0110] like Figure 5A As shown in FIG, if UE 502 determines at 510a that the time offset between reception of DCI 1 and the corresponding PDSCH is equal to or greater than a threshold (e.g., timeDurationForQCL), UE 502 may apply the TCI state indicated in the DCI to the PDSCH at 512a. For example, at 514, UE 502 may determine a receive beam for receiving the PDSCH based on the indicated TCI state.

[0111] If the UE 502 determines at 510b that the time offset is less than a threshold (eg, timeDurationForQCL), the UE 502 applies the default QCL assumption to the PDSCH at 512b. For example, at 514, the UE 502 may determine a receive beam for receiving the PDSCH based on the default QCL.

[0112] UE 502 may maintain two default QCL assumptions corresponding to the lowest CORESET ID within each CORESET group, such as Figure 5C The two default QCL assumptions may be UE capabilities that may be conditioned on another UE capability of receiving two beams simultaneously (e.g., in the frequency range (FR2), millimeter wave (mmWave) frequency range). For example, UE 502 may support mDCI in FR2, but may not support two simultaneous beam receptions and / or may not support both default QCL assumptions. Figure 5A In the example in , the default QCL assumption is the QCL assumption of the lowest CORESET-ID in the CORESET with index value 0.

[0113] In other words, if the UE 502 is configured by a higher layer parameter PDCCH-Config including two different values of CORESETPoolIndex in a ControlResourceSet, if the time offset between the reception of the DL DCI and the corresponding PDSCH is less than the threshold timeDurationForQCL, the UE may assume that the demodulation reference signal (DM-RS) port of the PDSCH associated with the CORESETPoolIndex value of the serving cell is in QCL with respect to the QCL parameters of the PDCCH QCL indication for the CORESET with the lowest CORESET-ID associated with the monitored search space among the CORESETs configured with the same CORESETPoolIndex value as the PDCCH scheduling the PDSCH in the most recent time slot in which the UE 502 monitors one or more CORESETs associated with the same CORESETPoolIndex value as the PDCCH scheduling the PDSCH within the active BWP of the serving cell.

[0114] At 516, UE 502 receives the PDSCH from the BS using the determined receive beam (at t2).

[0115] Example QCL assumptions for single DCImTRP PDSCH

[0116] Figure 6Ais a call flow diagram illustrating example signaling 600 for a single downlink control information (DCI) multiple transmission reception point (mTRP) physical downlink shared channel (PDSCH) quasi co-location (QCL) assumption.

[0117] In some wireless systems (eg, Release 16 systems), PDSCH may be transmitted by multiple TRPs and scheduled by a single DCI.

[0118] For example, Figure 6B As shown in , DCI transmitted from a first TRP (e.g., TRP A) (e.g., on a PDCCH) schedules PDSCHs from both the first TRP (e.g., TRP A) and a second TRP (e.g., TRP B), where the PDSCHs are multi-state PDSCHs. In some examples, different TRPs transmit PDSCHs using spatial division multiplexing (SDM), such as Figure 6C For example, different TRPs use different spatial layers in overlapping resource blocks (RBs) / symbols and transmit in different transmission configuration indicator (TCI) states. In some examples, different TRPs use frequency division multiplexing (FDM) to transmit PDSCH, such as Figure 6D For example, different TRPs use different RBs and transmit in different TCI states. In some examples, different TRPs use time division multiplexing (TDM) to transmit PDSCH, such as Figure 6E For example, different TRPs use different OFDM symbols (e.g., in different mini-slots or time slots) and are transmitted with different TCI states. Different repetitions can be transmitted within a time slot and / or in different time slots.

[0119] Each TCI code point in the DCI (e.g., corresponding to a TCI field value in the DCI) may indicate one TCI state or two TCI states for the PDSCH. Accordingly, the scheduled PDSCH may have two TCI states (e.g., corresponding to two TRPs). Figure 6A As shown in FIG, at 606, a user equipment (UE) 602 receives a DCI (at t1) scheduling a PDSCH (at t2) from TRP1 604 at a base station (BS), and the DCI has code points indicating two TCI states.

[0120] The UE 602 may apply the indicated TCI state or the default QCL assumption based on whether the time duration between the scheduled PDSCH and the DCI satisfies a threshold. For example, the threshold may be a "timeDurationForQCL" threshold. The UE 602 may report the threshold (e.g., 14 or 28 OFDM symbols) to the BS as a UE capability.

[0121] like Figure 6A As shown in FIG, if UE 602 determines at 608a that the time offset between the reception of the DCI and the corresponding PDSCH is equal to or greater than a threshold (e.g., timeDurationForQCL), UE 602 may apply the TCI state indicated in the DCI to the PDSCH at 610a. For example, at 612, UE 602 may determine a receive beam for receiving the PDSCH based on the indicated TCI state.

[0122] If the UE 602 determines at 608b that the time offset is less than a threshold (eg, timeDurationForQCL), the UE 602 applies the default QCL assumption to the PDSCH at 610b. For example, at 614, the UE 602 may determine a receive beam for receiving the PDSCH based on the default QCL.

[0123] UE 602 may maintain two default QCL assumptions, such as Figure 6F As shown in . The two default QCL assumptions may be a UE capability that may be conditioned on another UE capability of simultaneously receiving two beams (e.g., in the frequency range (FR2), millimeter wave (mmWave) frequency range). For example, UE 602 may support mDCI in FR2 but not support two simultaneous beam reception and / or two default QCL assumptions. The default QCL assumption may correspond to the TCI state of the lowest DCI code point among the two DCI code points indicating the TCI state.

[0124] In other words, if the offset between the reception of downlink (DL) DCI and the corresponding PDSCH is less than the threshold timeDurationForQCL, and at least one configured TCI state of the serving cell on which the PDSCH is scheduled includes "QCL-TypeD", and at least one TCI code point indicates two TCI states, then the UE 602 may assume that the demodulation reference signal (DM-RS) port of the PDSCH of the serving cell is in QCL with respect to the QCL parameters associated with the TCI state corresponding to the lowest code point among the TCI code points including two different TCI states and the reference signal (RS).

[0125] At 614, UE 602 receives the PDSCH from the BS using the determined receive beam (at t2).

[0126] Example QCL Assumptions for Single TRP A-CSI-RS

[0127] Figure 7Ais a call flow diagram illustrating example signaling 700 for a single transmission reception point (TRP) aperiodic channel state information (A-CSI) reference signal (RS) quasi co-location (QCL) assumption with respect to certain wireless systems (eg, Release 15 systems).

[0128] For A-CSI, downlink control information (DCI) can trigger channel state information (CSI) reporting. For example, DCI with uplink grant can trigger A-CSI reporting on the physical uplink shared channel (PUSCH). Figure 7A As shown in , at 706, the CSI reporting configuration configured via radio resource control (RRC) may be configured with up to 128 trigger states (e.g., higher layer parameter AperiodicTriggerStateList) for the user equipment (UE) 702. Figure 7B As shown in , each trigger state in the list is linked to a CSI-RS resource set, each CSI-RS resource set has multiple CSI-RS resources, and the transmission configuration indicator (TCI) state of each CSI-RS resource is indicated as part of the trigger state configuration. At 708, a medium access control (MAC) control element (CE) can activate up to 64 configured trigger states.

[0129] At 710, UE 702 receives DCI (where the last symbol of the DCI is at t1) from BS 704 that triggers A-CSI-RS (where the first symbol of the A-CSI-RS is at t2). The DCI may indicate one of the active trigger states. For example, for the 2^N-1 trigger states activated by MAC-CE (e.g., for N=6, mapping to a maximum of 64 code points), a field (e.g., a CSI request field) may use N bits to indicate one TCI state (e.g., all 0s means no CSI report is triggered).

[0130] It takes time for UE 702 to switch its beam to receive A-CSI-RS (e.g., switch to the beam indicated by the TCI associated with the CSI-RS resource set triggered by the DCI). UE 702 may apply the indicated TCI state or the default QCL assumption based on whether the time duration between the A-CSI-RS and the DCI meets a threshold. For example, the threshold may be a "beam switch timing" threshold. UE 702 may report this threshold as a UE capability to TRP 1 704 associated with the base station (BS).

[0131] like Figure 7AAs shown in FIG, if the UE 702 determines at 712a that the time offset between the reception of the DCI and the corresponding A-CSI-RS is equal to or greater than a threshold (e.g., beamSwitchTiming), the UE 702 may apply the TCI state indicated in the DCI to the A-CSI-RS at 714a. For example, at 716, the UE 702 may determine a receive beam for receiving the A-CSI-RS based on the indicated TCI state.

[0132] If the UE 702 determines at 712b that the time offset is less than a threshold (e.g., beamSwitchTiming) and the UE 702 determines that no other downlink (DL) signals are present in the same symbol as the A-CSI-RS, the UE 702 applies a default QCL assumption to the A-CSI-RS at 714b. For example, at 716, the UE 702 may determine a receive beam for receiving the A-CSI-RS based on the default QCL. For example, the default QCL assumption may be the QCL of the lowest CORESET-ID in the most recent slot in which the UE 702 monitors a control resource set (CORESET) within the active bandwidth part (BWP) of the serving cell.

[0133] If other DL signals are present in the same symbol as the A-CSI-RS, the UE 702 applies the QCL assumption for the other DL signals if the other signals have the indicated TCI state. For example, the other DL signal may be a physical downlink shared channel (PDSCH) with an offset greater than or equal to the threshold timeDurationForQCL. The other DL signal may be another A-CSI-RS with an offset greater than or equal to the threshold BeamSwitchTiming. The other DL signal may be a periodic CSI-RS or a semi-persistent CSI-RS.

[0134] In other words, for each A-CSI resource in the CSI-RS resource set associated with a CSI triggering state, the UE 702 is indicated the QCL configuration and QCL type of the RS source (higher layer signaling qcl-info), which contains a list of references to the TCI states of the A-CSI-RS resources associated with the triggered state: if the states in the list are configured with reference to the RS associated with QCL-TypeD, the RS can be a synchronization signal (SS) / physical broadcast channel (PBCH) block located in the same or different CC / DL BWP or a CSI-RS resource configured as periodic or semi-persistent in the same or different CC / DL BWP. If the scheduling offset between the last symbol of the physical downlink control channel (PDCCH) carrying the triggering DCI and the first symbol of the A-CSI-RS resource in the NZP-CSI-RS-ResourceSet configured without the higher layer parameter trs-Info and the higher layer parameter repetition is less than the threshold beamSwitchTiming reported by the UE 702 (when the reported value is {14, 28, 28}), if there is any other DL signal with the indicated TCI state in the same symbol as the CSI-RS, the UE 702 also applies the QCL assumption of the other DL signal when receiving the aperiodic CSI-RS. The other DL signals refer to PDSCH scheduled with an offset greater than or equal to the threshold timeDurationForQCL, aperiodic CSI-RS, periodic CSI-RS, and semi-persistent CSI-RS scheduled with an offset greater than or equal to the UE-reported threshold beamSwitchTiming (when the reported value is one of the values {14, 28, 28}). Otherwise, when receiving aperiodic CSI-RS, the UE 702 applies the QCL hypothesis for the CORESET with the lowest CORESET-ID associated with the monitored search space in the most recent time slot in which one or more CORESETs within the active BWP of the serving cell are monitored.

[0135] At 718, the UE 702 receives the A-CSI-RS from the BS using the determined reception beam (at t2).

[0136] In some systems, A-CSI reports can be configured and associated with A-CSI-RS resource sets. In some examples, A-CSI reports are configured with mTRP. What is needed is a technique for determining the QCL assumption with respect to A-CSI-RS, for example, in scenarios where a UE supports simultaneous reception using two beams and two default QCL assumptions.

[0137] Example QCL assumptions for A-CSI-RS configured with mTRP

[0138] Aspects of the present disclosure provide apparatus, methods, processing systems, and computer-readable media for quasi-co-location (QCL) assumption of aperiodic channel state information (CSI) reference signals (RS) configured with multiple transmit reception points (mTRPs).

[0139] Figure 8 is a call flow diagram illustrating example signaling 800 for multiple downlink control information (mDCI) multiple transmit reception points (mTRP) A-CSI-RS QCL assumptions in accordance with certain aspects of the present disclosure. A user equipment (UE) 802 may implement two simultaneous beam receptions and two default QCL assumptions.

[0140] For A-CSI, DCI can trigger CSI reporting. For example, DCI with uplink (UL) grant can trigger A-CSI reporting on the physical uplink shared channel (PUSCH). Figure 8 As shown in , at 806, UE 802 may be configured with a set of trigger states (e.g., up to 128 trigger states) (e.g., via radio resource control (RRC) signaling received from TRP1 804 associated with a base station (BS)). For example, the trigger state set may be configured for UE 802 in a CSI reporting configuration. Figure 8 As shown in , each trigger state in the list can be linked to a CSI-RS resource set. Each CSI-RS resource set can have multiple CSI-RS resources. The transmission configuration indicator (TCI) state of each CSI-RS resource can be indicated as part of the trigger state configuration. At 808, a medium access control (MAC) control element (CE) can activate a subset of the configured trigger states (e.g., up to 64).

[0141] UE 802 may be scheduled for mDCI mTRP transmission. For example, UE 802 may be configured by a higher layer parameter (eg, PDCCH-Config) containing two different index values (eg, CORESETPoolIndex) in two different CORESETs. Figure 8As shown in , at 806, UE 802 may also receive a configuration (e.g., a PDCCH-config RRC parameter) with an index value (e.g., a CORESETPoolIndex value) from TRP 1 804 (or TRP 2 or both). The configuration of the trigger state and the index value may be performed separately and / or at different times. As discussed above, each control resource set (CORESET) may be configured with an index value. In some examples, the index value is 0 or 1. Thus, the CORESETs may be divided into two groups (e.g., a CORESET group associated with a CORESETPoolIndex value of 0 and a CORESET group associated with a CORESETPoolIndex value of 1).

[0142] At 810, UE 802 may receive a DCI (at t1) from the BS that triggers an A-CSI-RS (at t2). The DCI may indicate one of the active triggering states. It takes time for UE 802 to switch its beam to receive the A-CSI-RS (e.g., switch to the beam indicated by the TCI state associated with the CSI-RS resource set triggered by the DCI). UE 802 may apply the indicated TCI state or the default QCL assumption based on whether the time duration between the A-CSI-RS and the DCI meets a threshold. For example, the threshold may be a "beamSwitchTiming" threshold. UE 802 may report the threshold to the BS as a UE capability.

[0143] like Figure 8 As shown in , the DCI received at 810 may indicate the TCI state of the scheduled A-CSI-RS. The DCI may be in a format associated with one of the index values (e.g., Figure 8 The DCI is received in a CORESET associated with the CORESET (index value 0 in the example shown). Thus, UE 802 identifies the CORESET and index value associated with the DCI. The index value of the CORESET in which the DCI is received can be used for various purposes, such as hybrid automatic repeat request (HARQ)-Ack codebook construction and transmission, physical downlink shared channel (PDSCH) scrambling, and the like.

[0144] like Figure 8 As shown in FIG, if UE 802 determines at 812a that the time offset between the reception of DCI and the corresponding A-CSI-RS is equal to or greater than a threshold (e.g., beamSwitchTiming), UE 802 may apply the TCI state indicated in the DCI to the A-CSI-RS at 814a. For example, at 816, UE 802 may determine a receive beam for receiving the A-CSI-RS based on the indicated TCI state.

[0145] If the scheduling offset between the DCI triggering the A-CSI report and the indicated A-CSI-RS resource set is less than a threshold (e.g., the UE reported threshold beamSwitchTiming), the UE 802 may apply a QCL assumption based on a default QCL assumption or based on the QCL of another downlink (DL) signal.

[0146] According to certain aspects, when no other DL signals are present in the same symbol as the triggered A-CSI-RS, the UE 802 may determine to use a default QCL assumption. Figure 8 As shown in , if the UE 802 determines at 812b that the time offset is less than a threshold (e.g., beamSwitchTiming), the UE 802 applies a default QCL assumption to the A-CSI-RS at 814b. For example, at 816, the UE 802 may determine a receive beam for receiving the A-CSI-RS based on the default QCL. The default QCL assumption may be the QCL assumption of the lowest CORESET-ID among the CORESETs associated with the same index value as the DCI in the most recent time slot in which these CORESETs are monitored within the active bandwidth part (BWP) of the serving cell.

[0147] According to certain aspects, UE 802 may determine to use a QCL hypothesis for another DL signal in the same symbol as the triggered A-CSI-RS. Figure 8 As shown in , if the UE 802 determines at 812b that the time offset is less than a threshold (eg, beamSwitchTiming), the UE 802 applies the QCL assumption of another DL signal to the A-CSI-RS at 814c.

[0148] In some examples, UE 802 applies a QCL assumption for another DL signal with an indicated TCI state in the same symbol as the triggered A-CSI-RS. For example, UE 802 may determine the index value of the CORSET in which the DCI triggering AP CSI is received. If the index value is the same as the index value associated with the triggered A-CSI-RS, UE 802 may use the QCL assumption for the DL signal.

[0149] In some examples, when other DL signals are scheduled with an offset equal to or greater than a threshold, the UE 802 applies the QCL assumption for the other DL signals with the same index value. For example, the other DL signal may be a PDSCH (scheduled in the same symbol as the triggered A-CSI-RS and with the same index value) with an offset equal to or greater than a threshold (e.g., a timeDurationForQCL threshold) from the DCI that schedules the PDSCH. The other DL signal may be another A-CSI-RS (scheduled in the same symbol as the triggered A-CSI-RS and with the same index value) with an offset equal to or greater than a threshold (e.g., a beamSwitchTiming threshold) from the DCI that triggers the other A-CSI-RS. In some examples, the other DL signal is a physical downlink control channel (PDCCH) received in a CORESET associated with the same index value as the A-CSI-RS and in the same symbol as the A-CSI-RS.

[0150] In some examples, UE 802 applies a QCL assumption for another DL signal not associated with an index value in the same symbol as the triggered A-CSI-RS. For example, the other DL signal may be a semi-persistent CSI-RS or a persistent CSI-RS in the same symbol as the A-CSI-RS.

[0151] In some examples, if there are multiple other DL signals in the same symbol as the A-CSI-RS, the UE 802 applies the QCL assumption for the DL signal associated with the lowest CSI-RS resource ID.

[0152] In some examples, if multiple other DL signals are present in the same symbol as the A-CSI-RS, the UE 802 applies a default QCL assumption. For example, the UE 802 may apply the QCL assumption of the lowest CORESET-ID among the CORESETs associated with the same index value as the DCI in the most recent slot in which these CORESETs were monitored within the active BWP of the serving cell.

[0153] In some examples, if there are multiple other DL signals in the same codeword as the A-CSI-RS, when at least two different QCL hypotheses are used to receive the other DL signals, the UE 802 applies the QCL hypothesis of the DL signal associated with the lowest CSI-RS resource ID.

[0154] At 818, UE 802 receives the A-CSI-RS from TRP 1 804 using the determined receive beam (at t2).

[0155] Figure 9is a flow diagram illustrating example operations 900 for QCL assumptions for A-CSI-RS with mDCI mTRP for wireless communications by a UE in accordance with certain aspects of the present disclosure. The UE may support concurrent reception of multiple beams and multiple default QCL assumptions for multiple DCI mTRP communications. Operations 900 may be performed, for example, by a UE such as Figure 1 Operation 900 may be performed by a UE 120a in the wireless communication network 100. Operation 900 may be implemented as a processor in one or more processors (e.g., Figure 2 Furthermore, signal transmission and reception by the UE in operations 900 and / or 1200 may be performed by, for example, one or more antennas (e.g., Figure 2 In certain aspects, signal transmission and / or reception by the UE may be accomplished via one or more processors (e.g., Figure 2 This is achieved by obtaining and / or outputting signals from a bus interface of the controller / processor 280).

[0156] Operations 900 may begin, at 905, by receiving signaling to configure a plurality of index values associated with different CORESETs for the UE.

[0157] In some examples, the signaling is higher layer signaling that configures the UE with a first CORESET pool index value associated with the first plurality of CORESETs and a second CORESET pool index value associated with the second plurality of CORESETs.

[0158] At 910, the UE receives a first DCI triggering an A-CSI-RS resource set for A-CSI reporting from a base station. The first DCI is received in a first CORESET among different CORESETs. The first CORESET is associated with a first index value among a plurality of index values.

[0159] At 920, when a first time offset between the first DCI and the A-CSI-RS resource set is less than a first threshold time offset, the UE determines a QCL hypothesis for receiving the A-CSI-RS using the A-CSI-RS resource set based at least in part on the first index value. For example, at 915, the UE may determine the time offset between the first DCI and the A-CSI-RS resource set.

[0160] In some examples, the first threshold time offset is a beam switching timing parameter reported to the BS as a capability of the UE.

[0161] In some examples, determining a QCL hypothesis for receiving an A-CSI-RS includes identifying whether one or more DL signals are in the same one or more symbols as the A-CSI-RS, and identifying whether the one or more DL signals are associated with a first index value.

[0162] In some examples, when the UE identifies that one or more DL signals are in the same one or more symbols as an A-CSI-RS and are associated with a first index value, the UE determines the QCL hypothesis for receiving the A-CSI-RS to be the QCL hypothesis of one of the one or more DL signals. In some examples, the one or more DL signals include: one or more PDSCHs scheduled by one or more second DCIs received in a CORESET associated with the first index value, wherein a time offset between the one or more second DCIs and the one or more PDSCHs is equal to or greater than a second threshold time offset; one or more second A-CSI-RSs scheduled by one or more second DCIs received in a CORESET associated with the first index value, wherein a time offset between the one or more second DCIs and the one or more A-CSI-RSs is equal to or greater than a first threshold time offset; or one or more PDCCHs received in a CORESET associated with the first index value.

[0163] In some examples, when the UE identifies one or more DL signals as being in the same symbol or symbols as an A-CSI-RS and not associated with an index value, the UE determines the QCL assumption for receiving the A-CSI-RS to be the QCL assumption for one of the one or more DL signals. In some examples, the one or more DL signals are one or more of a semi-persistent CSI-RS or a periodic CSI-RS. In some examples, the QCL assumption is the QCL assumption for the DL signal associated with the lowest CSI-RS resource ID. In some examples, the one or more DL signals are associated with different QCL assumptions. In some examples, when the UE identifies one or more DL signals as being in the same symbol or symbols as an A-CSI-RS and not associated with an index value, the UE determines the QCL assumption for receiving the A-CSI-RS to be the default QCL assumption associated with the first index value. In some examples, the default QCL is the QCL associated with the lowest CORESET ID in the CORESET associated with the first index value in the most recent time slot and within the active BWP of the serving cell. In some examples, the one or more DL signals are associated with the same QCL.

[0164] In some examples, when the UE identifies that no second DL signal is associated with the first TCI state in the same one or more symbols as the A-CSI-RS, the UE determines the QCL hypothesis for receiving the A-CSI-RS to be a default QCL hypothesis associated with the first index value. In some examples, the default QCL hypothesis is the QCL hypothesis associated with the lowest CORESET ID in the CORESET associated with the first index value in the most recent time slot and within the active bandwidth part (BWP) of the serving cell.

[0165] In some examples, when the time offset is equal to or greater than a first threshold time offset, the UE determines to apply the QCL assumption indicated in the first DCI.

[0166] In some examples, the UE determines a receive beam to be used for receiving the A-CSI-RS based on the determined QCL hypothesis. In some examples, the UE receives a CSI report configuration that configures one or more A-CSI-RS resource sets for the UE. Each A-CSI-RS resource set includes multiple A-CSI-RS resources. Each A-CSI-RS resource is associated with a TCI state. In some examples, the UE measures the A-CSIRS and sends an A-CSI report to the base station based on the measurements.

[0167] Figure 10 is a flow diagram illustrating example operations 1000 for QCL assumption for A-CSI-RS with mDCImTRP for wireless communications by a BS in accordance with certain aspects of the present disclosure. Operations 1000 may be performed, for example, by a BS such as Figure 1 The operation 1000 may be performed by BS 110a in the wireless communication network 100. The operation 1000 may be implemented as one or more processors (e.g., Figure 2 Furthermore, signal transmission and reception by the BS in operation 1000 may be performed by, for example, one or more antennas (e.g., Figure 2 In some aspects, signal transmission and / or reception by the BS may be performed via one or more processors (e.g., Figure 2 This is achieved by obtaining and / or outputting signals from a bus interface of the controller / processor 240).

[0168] Operations 1000 may begin, at 1005, by configuring a UE with multiple index values associated with different CORESETs.

[0169] At 1010, the base station sends a first DCI to the UE triggering an A-CSI-RS resource set for A-CSI reporting. The first DCI is sent in a first CORESET among different CORESETs. The first DCI is associated with a first index value among a plurality of index values.

[0170] At 1020, when the time offset between the first DCI and the A-CSI-RS resource set is less than a first threshold time offset, the BS determines a QCL hypothesis for transmitting the A-CSI-RS using the A-CSI-RS resource set based at least in part on a first index value associated with the first DCI. For example, at 1015, the BS may determine the time offset between the first DCI and the A-CSI-RS resource set.

[0171] Figure 11 is a call flow diagram illustrating example signaling 1100 for single DCImTRP A-CSI-RS QCL assumption in accordance with certain aspects of the present disclosure. A UE 1102 may implement two simultaneous beam receptions and two default QCL assumptions.

[0172] As discussed above, for A-CSI, DCI may trigger CSI reporting. For example, a DCI with UL grant may trigger A-CSI reporting on PUSCH. Figure 11 As shown in , at 1106, UE 1102 may be configured with a set of trigger states (e.g., up to 128 trigger states) (e.g., via RRC signaling). For example, the set of trigger states may be configured for UE 1102 in the CSI reporting configuration. Figure 11 As shown in , each trigger state in the list can be linked to a CSI-RS resource set. Each CSI-RS resource set can have multiple CSI-RS resources. The TCI state of each CSI-RS resource can be indicated as part of the trigger state configuration. At 1108, the MAC-CE can activate a subset of the configured trigger states (e.g., up to 64).

[0173] UE 1102 may be scheduled for single DCImTRP transmission. Figure 11 As shown in FIG, 1102 receives a MAC-CE at 1110 that maps at least one TCI code point to two activated TCI states. At 1112, UE 1102 may receive a DCI (at t1) from a TRP 1104 associated with the BS that triggers an A-CSI-RS (at t2) (e.g., and triggers an A-CSI report on the PUSCH). The DCI may indicate one of the active triggering states. For example, the DCI may indicate a TCI code point that may be mapped to one or more of the two TCI states.

[0174] It takes time for UE 1102 to switch its beam to receive A-CSI-RS (e.g., switch to the beam indicated by the TCI state in the DCI). UE 1102 can apply the indicated TCI state or the default QCL assumption based on whether the time duration between the A-CSI-RS and the DCI meets a threshold. For example, the threshold can be a "beam switch timing" threshold. UE 1102 can report this threshold to the BS as a UE capability.

[0175] like Figure 11 As shown in FIG, if the UE 1102 determines at 1114a that the time offset between the reception of the DCI and the corresponding A-CSI-RS is equal to or greater than a threshold (e.g., beamSwitchTiming), the UE 1102 may apply the TCI state indicated in the DCI to the A-CSI-RS at 1116a. For example, at 1118, the UE 1102 may determine a receive beam for receiving the A-CSI-RS based on the indicated TCI state.

[0176] If the scheduling offset between the DCI triggering the A-CSI report and the indicated A-CSI-RS resource set is less than the UE threshold (e.g., the UE reported threshold beamSwitchTiming), UE 1102 may apply the QCL assumption based on the default QCL assumption or based on the QCL of another DL signal.

[0177] According to certain aspects, when no other DL signals are present in the same symbol as the triggered A-CSI-RS, the UE 1102 may determine to use a default QCL assumption. Figure 11 As shown in FIG, if UE 1102 determines at 1114b that the time offset is less than a threshold (e.g., beamSwitchTiming), UE 1102 applies a first default QCL assumption to the A-CSI-RS at 1116b. For example, at 1118, UE 1102 may determine a receive beam for receiving the A-CSI-RS based on the first default QCL. The first default QCL assumption may be a first TCI state indicating the lowest TCI code point among two TCI code points.

[0178] According to certain aspects, UE 1102 may determine to use a QCL hypothesis for another DL signal in the same symbol as the triggered A-CSI-RS. Figure 11 As shown in , if the UE 1102 determines at 1114b that the time offset is less than a threshold (eg, beamSwitchTiming), the UE 802 applies the QCL assumption of another DL signal to the A-CSI-RS at 1116c.

[0179] In some examples, the other DL signal may be a PDSCH scheduled with an offset greater than or equal to a threshold (e.g., a timeDurationForQCL threshold) (e.g., an offset from the DCI that schedules the PDSCH to the PDSCH). In some examples, if the PDSCH has two TCI states (e.g., the TCI field / codepoint of the DCI that schedules the PDSCH indicates two TCI states), the UE 1102 may determine the first indicated TCI state of the two TCI states as the QCL hypothesis for receiving the A-CSI-RS.

[0180] In some examples, the other DL signal can be another A-CSI-RS whose scheduling offset (e.g., from the DCI that triggers the other A-CSI-RS to the A-CSI-RS) is greater than or equal to a threshold (e.g., a beamSwitchTiming threshold).

[0181] In some examples, the other DL signal may be a periodic CSI-RS or a semi-persistent CSI-RS.

[0182] According to certain aspects, there may be multiple other DL signals in the same codeword as the triggered A-CSI-RS. The multiple other DL signals may have different QCL assumptions. In some examples, UE 1102 follows the QCL assumption of PDSCH (if any), UE 1102 follows the QCL assumption of another A-CSI-RS (if any), or follows the QCL assumption of periodic or semi-persistent CSI-RS. For example, UE 1102 may be configured with rules or priorities regarding which type of QCL assumption to use when different types of signals are present in the same codeword as A-CSI-RS. In some examples, if there are multiple periodic or semi-persistent CSI-RS in the same codeword as the triggered A-CSI-RS, UE 1102 may follow the QCL assumption of the periodic or semi-persistent CSI-RS associated with the lowest CSI-RS resource ID.

[0183] At 1120, UE 1102 receives the A-CSI-RS from TRP 1 1104 using the determined receive beam (at t2).

[0184] Figure 12 is a flow diagram illustrating example operations 1200 for a single DCI mTRP A-CSI-RS QCL assumption for wireless communications by a UE in accordance with certain aspects of the present disclosure. The UE may support concurrent reception of multiple beams and multiple default QCLs for single DCI mTRP communications. Multiple TRPs may be transmitted using SDM, FDM, and / or TDM. Operations 1200 may be performed, for example, by a UE such as Figure 1Operation 1200 may be performed by a UE 120a in the wireless communication network 100. Operation 1200 may be implemented as a processor on one or more processors (e.g., Figure 2 Furthermore, signal transmission and reception by the UE in operations 900 and / or 1200 may be performed by, for example, one or more antennas (e.g., Figure 2 In certain aspects, signal transmission and / or reception by the UE may be accomplished via one or more processors (e.g., Figure 2 This is achieved by obtaining and / or outputting signals from a bus interface of the controller / processor 280).

[0185] Operations 1200 may begin at 1205 by identifying that a MAC-CE received from a base station indicates that at least one TCI code point is mapped to two TCI states. In some examples, the UE receives RRC signaling configuring multiple TCI states. The MAC-CE may activate a subset of the multiple TCI states for PDSCH reception. The MAC-CE may map the multiple TCI code points to one or more TCI states. At least one TCI code point is mapped to more than one TCI state. The DL DCI indicates the TCI code point.

[0186] At 1210 , the UE receives a first DCI triggering an A-CSI-RS resource set for A-CSI reporting from the BS.

[0187] At 1220, when the time offset between the first DCI and the A-CSI-RS resource set is less than a first threshold time offset, the UE determines a QCL hypothesis for receiving the A-CSI-RS using the A-CSI-RS resource set based at least in part on the identification MAC-CE indicating that at least one TCI code point is mapped to two TCI states. For example, at 1215, the UE may determine the time offset between the first DCI and the A-CSI-RS resource.

[0188] In some examples, the first threshold time offset is a beam switching timing parameter reported to the BS as a capability of the UE.

[0189] In some examples, determining a QCL hypothesis for receiving an A-CSI-RS includes: identifying whether one or more DL signals are in the same one or more symbols as the A-CSI-RS; and identifying whether the one or more DL signals are associated with the same TCI state.

[0190] In some examples, the one or more DL signals include one or more of the following: one or more PDSCHs scheduled by one or more second DCIs, wherein the time offset between the one or more second DCIs and the one or more PDSCHs is equal to or greater than a threshold; one or more second A-CSI-RSs scheduled by one or more second DCIs, wherein the time offset between the one or more second DCIs and the one or more A-CSI-RSs is equal to or greater than a threshold; one or more semi-persistent A-CSIs; and one or more periodic A-CSIs.

[0191] In some examples, when the UE identifies that a DL signal is in the same one or more symbols as an A-CSI-RS and is scheduled by a second DCI with a time offset between the second DCI and the DL signal, and the second DCI indicates two TCI states, the UE determines a first indicated TCI state of the two TCI states as a QCL hypothesis for receiving the A-CSI-RS. The DL signal is a PDSCH having the two TCI states indicated by the second DCI.

[0192] In some examples, when the UE identifies one or more DL signals in the same one or more symbols as the A-CSI-RS and indicating the same TCI state, the UE determines the QCL assumption used to receive the A-CSI-RS as the QCL assumption for the DL signal.

[0193] In some examples, when the UE identifies multiple DL signals in the same one or more codewords as an A-CSI-RS, where the multiple DL signals are not received in the same TCI state, when the multiple DL signals include PDSCH, the UE determines the QCL assumption for receiving the A-CSI-RS as the QCL assumption for the PDSCH; when the multiple DL signals include another A-CSI-RS, the UE determines the QCL assumption for receiving the A-CSI-RS as the QCL assumption for the other A-CSI-RS; and when the multiple DL signals include periodic or semi-persistent CSI-RS, the UE determines the QCL assumption for receiving the A-CSI-RS as the QCL assumption for the periodic or semi-persistent CSI-RS.

[0194] In some examples, determining the QCL assumption for receiving A-CSI-RS includes: when multiple DL signals include multiple periodic or semi-persistent CSI-RS, determining the QCL assumption for receiving A-CSI-RS as the QCL assumption for the periodic or semi-persistent CSI-RS with the lowest CSI-RS resource ID.

[0195] In some examples, when the UE identifies that no other DL signals are in the same one or more codewords as the A-CSI-RS and indicate the same TCI state, the UE determines the QCL assumption used to receive the A-CSI-RS as the default QCL assumption.

[0196] In some examples, the default QCL assumption is a QCL assumption associated with a first TCI state indicating a lowest TCI codepoint of the plurality of TCI states.

[0197] In some examples, when the time offset is equal to or greater than a threshold time offset, the UE determines to apply the QCL assumption indicated in the first DCI.

[0198] In some examples, the UE determines a receive beam to be used for receiving the A-CSI-RS based on the determined QCL hypothesis. In some examples, the UE receives a CSI report configuration that configures one or more A-CSI-RS resource sets for the UE. Each A-CSI-RS resource set includes multiple A-CSI-RS resources. Each A-CSI-RS resource is associated with a TCI state. In some examples, the UE measures the A-CSIRS and sends an A-CSI report to the base station based on the measurements.

[0199] Figure 13 is a flow diagram illustrating example operations 1300 for a single DCImTRP A-CSI-RS QCL assumption in accordance with certain aspects of the present disclosure. Operations 1300 may be performed, for example, by a BS (e.g., such as Figure 1 Operation 1300 may be performed by BS 110a in wireless communication network 100. Operation 1300 may be implemented as a processor (e.g., Figure 2 Furthermore, signal transmission and reception by the BS in operation 1300 may be performed by, for example, one or more antennas (e.g., Figure 2 In some aspects, signal transmission and / or reception by the BS may be performed via one or more processors (e.g., Figure 2 This is achieved by obtaining and / or outputting signals from a bus interface of the controller / processor 240).

[0200] Operations 1300 may begin at 1305 by identifying a MAC-CE sent to a UE indicating that at least one TCI code point is mapped to two TCI states.

[0201] At 1310 , the BS sends a first DCI triggering an A-CSI-RS resource set for A-CSI reporting to the UE.

[0202] At 1320, when the first time offset is less than a first threshold time offset, determining a QCL hypothesis for transmitting an A-CSI-RS using the A-CSI-RS resource set based at least in part on the identification MAC-CE indicating that at least one TCI code point is mapped to two TCI states. For example, at 1315, the BS may determine a first time offset between the first DCI and the A-CSI-RS resource.

[0203] Figure 14 Illustrated are operations that may include being configured to perform the techniques disclosed herein (such as Figure 9 and / or Figure 12 14. The communication device 1400 includes various components (e.g., corresponding to means-plus-function components) that perform the operations illustrated in FIG. 14. The communication device 1400 includes a processing system 1402 coupled to a transceiver 1408 (e.g., a transmitter and / or receiver). The transceiver 1408 is configured to transmit and receive signals for the communication device 1400 (such as the various signals described herein) via an antenna 1410. The processing system 1402 is configured to perform processing functions for the communication device 1400, including processing signals received and / or to be transmitted by the communication device 1400.

[0204] The processing system 1402 includes a processor 1404 coupled to a computer-readable medium / memory 1412 via a bus 1406. In some aspects, the computer-readable medium / memory 1412 is configured to store instructions (e.g., computer-executable code) that, when executed by the processor 1404, cause the processor 1404 to perform Figure 9 and / or Figure 12 , or other operations for performing the various techniques discussed herein. In certain aspects, the computer-readable medium / memory 1412 stores code 1414 for receiving, code 1416 for identifying, and code 1418 for determining. The code 1414 for receiving may include code for receiving signaling configuring multiple index values associated with different CORESETs for the UE, and receiving a first DCI from a base station (BS) triggering an A-CSI RS resource set for A-CSI reporting. The code 1416 for identifying may include code for identifying that a MAC CE received from the base station indicates that at least one transmission configuration indicator (TCI) code point is mapped to two TCI states. The code 1418 for determining may include code for determining, when a time offset between the first DCI and the A-CSI-RS resource set is less than a first threshold time offset, a QCL hypothesis for receiving an A-CSI-RS using the A-CSI-RS resource set based at least in part on the first index value and / or identifying that the MAC CE indicates that at least one TCI code point is mapped to two TCI states.

[0205] Processor 1404 may include circuitry configured to implement code stored in computer-readable medium / memory 1412, such as for executing Figure 9 and / or Figure 12 , and other operations for performing the various techniques discussed herein. For example, processor 1404 includes circuitry for receiving 1420, circuitry for identifying 1422, and circuitry for determining 1424. Circuitry for receiving 1420 may include circuitry for receiving signaling configuring multiple index values associated with different CORESETs for the UE, and receiving a first DCI from a BS that triggers an A-CSIRS resource set for A-CSI reporting. Circuitry for identifying 1422 may include circuitry for identifying that a MAC CE received from the BS indicates that at least one transmission configuration indicator (TCI) code point is mapped to two TCI states. The circuit system 1424 for determining may include a circuit system for the following operations: when the time offset between the first DCI and the A-CSI-RS resource set is less than a first threshold time offset, determining a QCL hypothesis for receiving A-CSI-RS using the A-CSI-RS resource set based at least in part on the first index value and / or the identification MAC-CE indicating that at least one TCI code point is mapped to two TCI states.

[0206] Figure 15 Illustrated may include operations configured to perform the techniques disclosed herein (such as, Figure 10 and / or Figure 13 15. The communication device 1500 includes various components (e.g., corresponding to means-plus-function components) that perform the operations illustrated in FIG. 15. The communication device 1500 includes a processing system 1502 coupled to a transceiver 1508 (e.g., a transmitter and / or receiver). The transceiver 1508 is configured to transmit and receive signals for the communication device 1500 (such as the various signals described herein) via an antenna 1510. The processing system 1502 is configured to perform processing functions for the communication device 1500, including processing signals received and / or to be transmitted by the communication device 1500.

[0207] The processing system 1502 includes a processor 1504 coupled to a computer-readable medium / memory 1512 via a bus 1506. In some aspects, the computer-readable medium / memory 1512 is configured to store instructions (e.g., computer-executable code) that, when executed by the processor 1504, cause the processor 1504 to perform Figure 10 and / or Figure 13, or other operations for performing the various techniques discussed herein. In certain aspects, the computer-readable medium / memory 1512 stores code for configuring 1514, code for identifying 1516, code for sending 1518, and code for determining 1520. The code for configuring 1514 may include code for configuring a UE with multiple index values associated with different CORESETs. The code for identifying 1516 may include code for identifying that a MAC CE sent to the UE indicates that at least one TCI code point is mapped to two TCI states. The code for sending 1518 may include code for sending a first DCI to the UE that triggers an A-CSI RS resource set for A-CSI reporting. The code 1520 for determining may include code for the following operations: when the time offset between the first DCI and the A-CSI-RS resource set is less than a first threshold time offset, determining a QCL assumption for sending A-CSI-RS using the A-CSI-RS resource set based at least in part on the first index value and / or based on an identification MAC-CE indicating that at least one TCI code point is mapped to two TCI states.

[0208] Processor 1504 may include circuitry configured to implement code stored in computer-readable medium / memory 1512, such as for executing Figure 10 and / or Figure 13 , and other operations for performing the various techniques discussed herein. For example, processor 1504 includes circuitry for configuring 1522, circuitry for identifying 1524, circuitry for transmitting 1526, and circuitry for determining 1528. Circuitry for configuring 1522 may include circuitry for configuring a UE with multiple index values associated with different CORESETs. Circuitry for identifying 1524 may include circuitry for identifying that a MAC CE sent to the UE indicates that at least one TCI code point is mapped to two TCI states. Circuitry for transmitting 1526 may include circuitry for transmitting a first DCI to the UE that triggers an A-CSI RS resource set for A-CSI reporting. The circuit system 1528 for determining may include a circuit system for the following operations: when the time offset between the first DCI and the A-CSI-RS resource set is less than a first threshold time offset, determining a QCL hypothesis for sending an A-CSI-RS using an A-CSI-RS resource set based at least in part on a first index value and / or based on an identification MAC-CE indicating that at least one TCI code point is mapped to two TCI states.

[0209] Example aspects

[0210] Implementation examples are described in the following numbered aspects:

[0211] In a first aspect, a method for wireless communication by a user equipment (UE) includes: receiving signaling to configure a plurality of index values associated with different control resource sets (CORESETs) for the UE; receiving first downlink control information (DCI) triggering an A-CSI reference signal (RS) resource set for aperiodic channel state information (A-CSI) reporting from a base station (BS), wherein the first DCI is received in a first CORESET among different CORESETs, and wherein the first CORESET is associated with a first index value among the plurality of index values; and determining a quasi co-location (QCL) assumption for receiving an A-CSI-RS using the A-CSI-RS resource set based at least in part on the first index value when a time offset between the first DCI and the A-CSI-RS resource set is less than a first threshold time offset.

[0212] In a second aspect, alone or in combination with the first aspect, the first threshold time offset comprises a beam switching timing parameter reported to the BS as a capability of the UE.

[0213] In a third aspect, alone or in combination with one or more of the first and second aspects, the signaling includes higher layer signaling to configure the UE with a first CORESET pool index value associated with the first plurality of CORESETs and a second CORESET pool index value associated with the second plurality of CORESETs.

[0214] In a fourth aspect, alone or in combination with one or more of the first to third aspects, the UE supports concurrent reception of multiple beams and multiple default QCL assumptions for multiple DCI (multi-DCI) multiple transmit receive (mTRP) communications.

[0215] In a fifth aspect, alone or in combination with one or more of the first to fourth aspects, determining a QCL hypothesis for receiving an A-CSI-RS includes: identifying whether one or more downlink signals are in the same one or more code elements as the A-CSI-RS; and identifying whether the one or more downlink signals are associated with a first index value.

[0216] In a sixth aspect, alone or in combination with one or more of the first to fifth aspects, when the UE identifies one or more downlink signals in the same one or more code elements as the A-CSI-RS and associated with a first index value, determining the QCL assumption for receiving the A-CSI-RS includes: determining the QCL assumption for receiving the A-CSI-RS as the QCL assumption for one of the one or more downlink signals.

[0217] In the seventh aspect, alone or in combination with one or more of the first to sixth aspects, the one or more downlink signals include: one or more physical downlink shared channels (PDSCHs) scheduled by one or more second DCIs received in a CORESET associated with a first index value, wherein the time offset between the one or more second DCIs and the one or more PDSCHs is equal to or greater than a second threshold time offset; one or more second A-CSI-RSs scheduled by one or more second DCIs received in a CORESET associated with a first index value, wherein the time offset between the one or more second DCIs and the one or more A-CSI-RSs is equal to or greater than the first threshold time offset; or one or more physical downlink control channels (PDCCHs) received in a CORESET associated with the first index value.

[0218] In an eighth aspect, alone or in combination with one or more of the first to seventh aspects, when the UE identifies one or more downlink signals in the same one or more code elements as the A-CSI-RS and not associated with a first index value, determining the QCL assumption for receiving the A-CSI-RS includes determining the QCL assumption for receiving the A-CSI-RS as the QCL assumption for one of the one or more downlink signals.

[0219] In the ninth aspect, alone or in combination with one or more of the first to eighth aspects,

[0220] The QCL hypothesis includes a QCL hypothesis for a downlink signal associated with the lowest CSI-RS resource identifier (ID).

[0221] In a tenth aspect, alone or in combination with one or more of the first to ninth aspects, when the UE identifies one or more downlink signals in the same one or more symbols as the A-CSI-RS and not associated with a first index value, determining the QCL assumption for receiving the A-CSI-RS includes determining the QCL assumption for receiving the A-CSI-RS as a default QCL assumption associated with the first index value.

[0222] In an eleventh aspect, alone or in combination with one or more of the first to tenth aspects, the default QCL assumption includes the QCL assumption associated with the lowest CORESET ID in the CORESET associated with the first index value in the most recent time slot and within the active bandwidth part (BWP) of the serving cell.

[0223] In the twelfth aspect, alone or in combination with one or more of the first to eleventh aspects,

[0224] The one or more downlink signals are associated with the same QCL hypothesis.

[0225] In the thirteenth aspect, alone or in combination with one or more of the first to twelfth aspects, when the UE identifies that there is no second downlink signal associated with the first index value in one or more code elements that are the same as the A-CSI-RS, determining the QCL assumption for receiving the A-CSI-RS includes: determining the QCL assumption for receiving the A-CSI-RS as a default QCL assumption associated with the first index value.

[0226] In the fourteenth aspect, alone or in combination with one or more of the first to thirteenth aspects,

[0227] The default QCL hypothesis includes the QCL hypothesis associated with the lowest CORESET ID in the CORESET associated with the first index value in the most recent time slot and within the active bandwidth part (BWP) of the serving cell.

[0228] In the fifteenth aspect, alone or in combination with one or more of the first to fourteenth aspects,

[0229] When the time offset is equal to or greater than a first threshold time offset, it is determined that the QCL assumption indicated in the first DCI is to be applied.

[0230] In the sixteenth aspect, alone or in combination with one or more of the first to fifteenth aspects,

[0231] A CSI reporting configuration is received that configures one or more A-CSI-RS resource sets for the UE, each A-CSI-RS resource set including a plurality of A-CSI-RS resources, and each A-CSI-RS resource is associated with a transmission configuration indicator (TCI) state.

[0232] In a seventeenth aspect, a method for wireless communication by a user equipment (UE) includes: identifying a medium access control (MAC) control element (CE) received from a base station (BS) indicating that at least one transmission configuration indicator (TCI) code point is mapped to two TCI states; receiving first downlink control information (DCI) from the BS that triggers an A-CSI reference signal (RS) resource set for aperiodic channel state information (A-CSI) report; and when a time offset between the first DCI and the A-CSI-RS resource set is less than a first threshold time offset, determining a quasi co-location (QCL) assumption for receiving A-CSI-RS using the A-CSI-RS resource set based at least in part on identifying the MAC-CE indicating that at least one TCI code point is mapped to two TCI states.

[0233] In an eighteenth aspect, alone or in combination with the seventeenth aspect, the first threshold time offset comprises a beam switching timing parameter reported to the BS as a capability of the UE.

[0234] In the nineteenth aspect, alone or in combination with one or more of the seventeenth and eighteenth aspects,

[0235] receiving radio resource control (RRC) signaling configuring a plurality of TCI states, wherein: a MAC-CE activates a subset of the plurality of TCI states for receiving a physical downlink shared channel (PDSCH) transmission;

[0236] The MAC-CE maps multiple TCI code points to one or more TCI states in a subset of multiple TCI states; the second DCI indicates one of the multiple TCI code points; and the UE supports concurrent reception of multiple beams and multiple default QCL assumptions for single DCI (single DCI) multiple transmit receive (mTRP) communication.

[0237] In the twentieth aspect, alone or in combination with one or more of the seventeenth to nineteenth aspects,

[0238] Determining a QCL hypothesis for receiving the A-CSI-RS includes identifying whether one or more downlink signals are in the same one or more symbols as the A-CSI-RS.

[0239] In the 21st aspect, alone or in combination with one or more of the 17th to 20th aspects,

[0240] When the UE identifies a downlink signal that is in the same one or more symbols as the A-CSI-RS and is scheduled by a second DCI with a time offset between the second DCI and the downlink signal, and the second DCI indicates two TCI states, determining the QCL hypothesis for receiving the A-CSI-RS further includes determining a first indicated TCI state of the two TCI states as the QCL hypothesis for receiving the A-CSI-RS.

[0241] In a twenty-second aspect, alone or in combination with one or more of aspects seventeen to twenty-first, the downlink signal is a physical downlink shared channel (PDSCH) having two TCI states indicated by the second DCI.

[0242] In aspect 23, alone or in combination with one or more of aspects 17 to 22, when the UE identifies one or more downlink signals in the same one or more symbols as the A-CSI-RS and indicating the same TCI state, determining the QCL assumption for receiving the A-CSI-RS further includes: determining the QCL assumption for receiving the A-CSI-RS as the QCL assumption for the downlink signal.

[0243] In aspect 24, alone or in combination with one or more of aspects 17 to 23, when the UE identifies multiple downlink signals in the same one or more codewords as an A-CSI-RS, wherein the multiple downlink signals are not received in the same TCI state, determining the QCL assumption for receiving the A-CSI-RS further includes: when the multiple downlink signals include a physical downlink shared channel (PDSCH), determining the QCL assumption for receiving the A-CSI-RS as the QCL assumption for the PDSCH; when the multiple downlink signals include another A-CSI-RS, determining the QCL assumption for receiving the A-CSI-RS as the QCL assumption for the other A-CSI-RS; and when the multiple downlink signals include a periodic or semi-persistent CSI-RS, determining the QCL assumption for receiving the A-CSI-RS as the QCL assumption for the periodic or semi-persistent CSI-RS.

[0244] In the twenty-fifth aspect, alone or in combination with one or more of aspects seventeen to twenty-fourth, determining the QCL assumption for receiving the A-CSI-RS includes: when the multiple downlink signals include multiple periodic or semi-persistent CSI-RSs, determining the QCL assumption for receiving the A-CSI-RS as the QCL assumption for the periodic or semi-persistent CSI-RS with the lowest CSI-RS resource identifier (ID).

[0245] In aspect 26, alone or in combination with one or more of aspects 17 to 25, when the UE identifies that no other downlink signals are in the same one or more codewords as the A-CSI-RS, determining the QCL assumption for receiving the A-CSI-RS further includes: determining the QCL assumption for receiving the A-CSI-RS as a default QCL assumption.

[0246] In a twenty-seventh aspect, alone or in combination with one or more of aspects seventeen to twenty-six, the default QCL hypothesis comprises a QCL hypothesis associated with a first TCI state indicating a lowest TCI codepoint of a plurality of TCI states.

[0247] In a twenty-eighth aspect, alone or in combination with one or more of aspects seventeen to twenty-seven, when the time offset is equal to or greater than a first threshold time offset, it is determined that the QCL assumption indicated in the first DCI is to be applied.

[0248] In a twenty-ninth aspect, a method for wireless communication by a base station (BS) includes: configuring a user equipment (UE) with a plurality of index values associated with different control resource sets (CORESETs);

[0249] sending first downlink control information (DCI) to the UE that triggers an A-CSI reference signal (RS) resource set for aperiodic channel state information (A-CSI) reporting, wherein the first DCI is sent in a first CORESET in different CORESETs, and wherein the first DCI is associated with a first index value among a plurality of index values; and determining a quasi co-location (QCL) assumption for sending the A-CSI-RS using the A-CSI-RS resource set based at least in part on the first index value when a time offset between the first DCI and the A-CSI-RS resource set is less than a first threshold time offset.

[0250] In a thirtieth aspect, a method for wireless communication by a base station (BS) includes: identifying a medium access control (MAC) control element (CE) sent to a user equipment (UE) indicating that at least one transmission configuration indicator (TCI) code point is mapped to two TCI states; sending first downlink control information (DCI) to the UE that triggers an A-CSI reference signal (RS) resource set for aperiodic channel state information (A-CSI) reporting; and when a time offset between the first DCI and the A-CSI-RS resource set is less than a first threshold time offset, determining a quasi co-location (QCL) assumption for sending A-CSI-RS using the A-CSI-RS resource set based at least in part on identifying the MAC-CE indicating that at least one TCI code point is mapped to two TCI states.

[0251] An apparatus comprising means for performing the method of any one of the first to twenty-eighth aspects.

[0252] An apparatus comprising means for performing the method of any one of aspects twenty-ninth to thirtieth.

[0253] A device comprising: at least one processor and a memory coupled to the at least one processor, the memory comprising code, the code being executable by the at least one processor to cause the device to perform a method as in any one of aspects 1 to 28.

[0254] A device comprising: at least one processor and a memory coupled to the at least one processor, the memory comprising code, the code being executable by the at least one processor to cause the device to perform a method as in any one of aspects twenty-ninth to thirtieth.

[0255] A computer-readable medium having stored thereon computer-executable code for wireless communication, which, when executed by at least one processor, causes an apparatus to perform the method of any one of aspects 1 to 28.

[0256] A computer-readable medium having stored thereon computer-executable code for wireless communication, which, when executed by at least one processor, causes an apparatus to perform the method of any one of aspects twenty-ninth to thirtieth.

[0257] Additional considerations

[0258] The techniques described herein can be used for various wireless communication technologies such as NR (e.g., 5G NR), 3GPP Long Term Evolution (LTE), Advanced LTE (LTE-A), Code Division Multiple Access (CDMA), Time Division Multiple Access (TDMA), Frequency Division Multiple Access (FDMA), Orthogonal Frequency Division Multiple Access (OFDMA), Single Carrier Frequency Division Multiple Access (SC-FDMA), Time Division Synchronous Code Division Multiple Access (TD-SCDMA), and other networks. The terms "network" and "system" are often used interchangeably. A CDMA network can implement radio technologies such as Universal Terrestrial Radio Access (UTRA) and cdma2000. UTRA includes Wideband CDMA (WCDMA) and other CDMA variants. cdma2000 covers IS-2000, IS-95, and IS-856 standards. A TDMA network can implement radio technologies such as Global System for Mobile Communications (GSM). OFDMA networks can implement radio technologies such as NR (e.g., 5G RA), Evolved UTRA (E-UTRA), Ultra Mobile Broadband (UMB), IEEE 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802.20, and Flash-OFDMA. UTRA and E-UTRA are parts of the Universal Mobile Telecommunications System (UMTS). LTE and LTE-A are versions of UMTS that use E-UTRA. UTRA, E-UTRA, UMTS, LTE, LTE-A, and GSM are described in documents from an organization called the 3rd Generation Partnership Project (3GPP). cdma2000 and UMB are described in documents from an organization called the 3rd Generation Partnership Project 2 (3GPP2). NR is an emerging wireless communication technology under development.

[0259] In 3GPP, the term "cell" can refer to the coverage area of a Node B (NB) and / or the NB subsystem serving that coverage area, depending on the context in which the term is used. In NR systems, the terms "cell" and base station (BS), next-generation Node B (gNB or g-Node B), access point (AP), distributed unit (DU), carrier, or transmit reception point (TRP) can be used interchangeably. A BS can provide communication coverage for macro cells, pico cells, femto cells, and / or other types of cells. A macro cell can cover a relatively large geographic area (e.g., several kilometers in radius) and can allow unrestricted access by UEs with service subscriptions. A pico cell can cover a relatively small geographic area and can allow unrestricted access by UEs with service subscriptions. A femto cell can cover a relatively small geographic area (e.g., a residence) and can allow restricted access by UEs associated with the femto cell (e.g., UEs in a closed subscriber group (CSG), UEs for users in a residence, etc.). A BS for a macro cell can 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.

[0260] A UE may also be referred to as a mobile station, a terminal, an access terminal, a subscriber unit, a station, a customer premises equipment (CPE), a cellular phone, a smartphone, 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 computer, a camera, a gaming device, a netbook, a smartbook, an ultrabook, an appliance, a medical device or medical equipment, a biometric sensor / device, a wearable device (such as a smart watch, smart clothing, smart glasses, a smart wristband, smart jewelry (e.g., a smart ring, a smart bracelet, etc.)), an entertainment device (e.g., a music device, a video device, a satellite radio, etc.), a vehicle component or sensor, a smart meter / sensor, industrial manufacturing equipment, a global positioning system device, or any other suitable device configured to communicate via a wireless or wired medium. Some UEs may be considered machine type communication (MTC) devices or evolved MTC (eMTC) devices. MTC and eMTC UEs include, for example, robots, drones, remote devices, sensors, meters, monitors, location tags, etc., which can communicate with a base station, another device (e.g., a remote device), or some other entity. A wireless node can provide connectivity to or to a network (e.g., a wide area network (such as the Internet) or a cellular network) via, for example, a wired or wireless communication link. Some UEs may be considered Internet of Things (IoT) devices, which may be narrowband IoT (NB-IoT) devices.

[0261] In some examples, access to the air interface may be scheduled. A scheduling entity (e.g., a BS) allocates resources for communication between some or all devices and equipment within its service area or cell. The scheduling entity may be responsible for scheduling, assigning, reconfiguring, and releasing resources for one or more subordinate entities. That is, for scheduled communications, the subordinate entities utilize the resources allocated by the scheduling entity. The base station is not the only entity that can be used as a scheduling entity. In some examples, a UE may act as a scheduling entity and may schedule resources for one or more subordinate entities (e.g., one or more other UEs), and other UEs may utilize the resources scheduled by the UE for wireless communication. In some examples, a UE may act as a scheduling entity in a peer-to-peer (P2P) network and / or in a mesh network. In the mesh network example, UEs may communicate directly with each other in addition to communicating with the scheduling entity.

[0262] Each method disclosed herein includes one or more steps or actions for implementing the method. These method steps and / or actions may be interchangeable with one another without departing from the scope of the claims. In other words, unless a specific order of steps or actions is specified, the order and / or use of the specific steps and / or actions may be modified without departing from the scope of the claims.

[0263] As used herein, 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 encompass: a, b, c, ab, ac, bc, and abc, as well as any combination with multiples of the same elements (e.g., aa, aaa, aab, aac, abb, acc, bb, bbb, bbc, cc, and ccc, or any other ordering of a, b, and c).

[0264] As used herein, the term "determining" encompasses a wide variety of actions. For example, "determining" may include calculating, computing, processing, deriving, investigating, searching (e.g., searching in a table, database, or another data structure), ascertaining, and the like. Furthermore, "determining" may include receiving (e.g., receiving information), accessing (e.g., accessing data in a memory), and the like. Furthermore, "determining" may include resolving, selecting, choosing, establishing, and the like.

[0265] The preceding description is provided to enable anyone skilled in the art to practice the various aspects described herein. Various modifications to these aspects will be readily apparent to those skilled in the art, and the universal principles defined herein may be applied to other aspects. Accordingly, the claims are not intended to be limited to the aspects shown herein, but rather should be granted the full scope consistent with the claim language, wherein singular references to elements are not intended to mean "one and only one" (unless specifically stated otherwise) but rather "one or more." Unless specifically stated otherwise, the term "some" refers to one or more. All structural and functional equivalents of the elements of the various aspects described throughout this disclosure, now or hereafter known to those of ordinary skill in the art, are expressly incorporated herein by reference and are intended to be covered by the claims. Furthermore, nothing disclosed herein is intended to be dedicated to the public, regardless of whether such disclosure is explicitly stated in the claims. No element of a claim should be interpreted under 35 U.S.C. §112(f) unless the element is explicitly recited using the phrase "means for..." or, in the case of a method claim, the element is recited using the phrase "step for..."

[0266] The various operations of the methods described above may be performed by any suitable device capable of performing the corresponding functions. These devices may include various hardware and / or software components and / or modules, including but not limited to circuits, application specific integrated circuits (ASICs), or processors. Generally, where there are operations illustrated in the figures, these operations may have corresponding counterpart means-plus-function components with similar numbering.

[0267] The various illustrative logical blocks, modules, and circuits described in conjunction with the present disclosure may be implemented or executed with a general-purpose processor, a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a field-programmable gate array (FPGA) or other programmable logic device (PLD), discrete gate or transistor logic, discrete hardware components, or any combination thereof designed to perform the functions described herein. A general-purpose processor may be a microprocessor, but in the alternative, the processor may be any commercially available processor, controller, microcontroller, or state machine. A processor 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 any other such configuration.

[0268] If implemented in hardware, an example hardware configuration may include a processing system in a wireless node. The processing system may be implemented using a bus architecture. Depending on the specific application and overall design constraints of the processing system, the bus may include any number of interconnecting buses and bridges. The bus may link together various circuits including a processor, a machine-readable medium, and a bus interface. The bus interface may be used to connect a network adapter, etc., to the processing system via the bus. The network adapter may be used to implement signal processing functions at the PHY layer. In a user terminal (see Figure 1 ), a user interface (e.g., a keypad, display, mouse, joystick, etc.) may also be connected to the bus. The bus may also link various other circuits (such as timing sources, peripherals, voltage regulators, power management circuits, etc.), which are well known in the art and therefore will not be described in detail. The processor may be implemented using one or more general and / or special purpose processors. Examples include microprocessors, microcontrollers, DSP processors, and other circuit systems capable of executing software. Those skilled in the art will recognize how to best implement the functionality described with respect to the processing system, depending on the specific application and the overall design constraints imposed on the overall system.

[0269] If implemented in software, each function may be stored as one or more instructions or codes on or transmitted via a computer-readable medium. Software should be broadly interpreted to mean instructions, data, or any combination thereof, whether referred to as software, firmware, middleware, microcode, hardware description language, or otherwise. Computer-readable media includes both computer storage media and communication media, including any media that facilitates the transfer of a computer program from one location to another. The processor may be responsible for managing the bus and general processing, including executing software modules stored on a machine-readable storage medium. A computer-readable storage medium may be coupled to the processor so that the processor can read and write information from / to the storage medium. In an alternative embodiment, the storage medium may be integrated into the processor. As an example, the machine-readable medium may include a transmission line, a carrier modulated by data, and / or a computer-readable storage medium having instructions stored thereon that is separate from the wireless node, all of which may be accessed by the processor via a bus interface. Alternatively or additionally, the machine-readable medium or any portion thereof may be integrated into the processor, such as a cache and / or general register file. As examples, examples of machine-readable storage media may include RAM (random access memory), flash memory, ROM (read-only memory), PROM (programmable read-only memory), EPROM (erasable programmable read-only memory), EEPROM (electrically erasable programmable read-only memory), registers, magnetic disks, optical disks, hard drives, or any other suitable storage media, or any combination thereof. Machine-readable media may be embodied in a computer program product.

[0270] A software module may include a single instruction or many instructions and may be distributed across several different code segments, between different programs, and across multiple storage media. A computer-readable medium may include several software modules. These software modules include instructions that, when executed by a device (such as a processor), cause a processing system to perform various functions. These software modules may include a transmitting module and a receiving module. Each software module may reside in a single storage device or be distributed across multiple storage devices. As an example, when a triggering event occurs, a software module may be loaded from a hard drive into RAM. During the execution of the software module, the processor may load some instructions into a cache to increase access speed. One or more cache lines may then be loaded into a general register file for execution by the processor. When describing the functionality of a software module below, it will be understood that such functionality is implemented by the processor when the processor executes instructions from the software module.

[0271] Likewise, any connection is properly termed a computer-readable medium. For example, if the software is transmitted from a website, server, or other remote source using a coaxial cable, fiber optic cable, twisted pair, digital subscriber line (DSL), or wireless technologies (such as infrared (IR), radio, and microwave), then the coaxial cable, fiber optic cable, twisted pair, DSL, or wireless technologies (such as infrared, radio, and microwave) are included in the definition of medium. Disk and disc, as used herein, include compact disc (CD), laser disc, optical disc, digital versatile disc (DVD), floppy disk, and Disks, where disks often reproduce data magnetically, and discs reproduce data optically with lasers. Thus, in some aspects, computer-readable media may include non-transitory computer-readable media (e.g., tangible media). Additionally, for other aspects, computer-readable media may include transient computer-readable media (e.g., signals). Combinations of the above should also be included within the scope of computer-readable media.

[0272] Thus, certain aspects may include a computer program product for performing the operations presented herein. For example, such a computer program product may include a computer-readable medium having instructions stored (and / or encoded) thereon, the instructions being executable by one or more processors to perform the operations described herein, such as for performing the operations described herein and in Figure 9 、 Figure 10 、 Figure 12 , and / or Figure 13 Instructions for the operations explained in .

[0273] In addition, it should be appreciated that the modules and / or other appropriate means for performing the methods and techniques described herein can be downloaded and / or otherwise obtained by the user terminal and / or base station where applicable. For example, such a device can be coupled to a server to facilitate the transfer of the means for performing the methods described herein. Alternatively, the various methods described herein can be provided via a storage device (e.g., RAM, ROM, a physical storage medium such as a compact disc (CD) or floppy disk, etc.) so that once the storage device is coupled to or provided to the user terminal and / or base station, the device can obtain the various methods. In addition, any other suitable technology suitable for providing the methods and techniques described herein to a device can be utilized.

[0274] It will be understood that the claims are not limited to the precise configuration and components illustrated above. Various changes, substitutions and variations may be made in the arrangement, operation and details of the methods and apparatus described above without departing from the scope of the claims.

Claims

1. A method for wireless communication by a user equipment (UE), comprising: receiving signaling to configure a plurality of control resource set (CORESET) pool index values for the UE, wherein each CORESET pool index value is associated with a different CORESET set; receiving first downlink control information (DCI) triggering an aperiodic channel state information (A-CSI) reference signal (RS) resource set for A-CSI reporting, wherein the first DCI is received in a first CORESET in the different CORESET sets, and wherein the first CORESET is associated with a first CORESET pool index value in the plurality of CORESET pool index values; as well as When the time offset between the first DCI and the A-CSI-RS resource set is less than a first threshold time offset, a quasi co-location (QCL) assumption is applied to receiving A-CSI-RS using the A-CSI-RS resource set based at least in part on the first CORESET pool index value.

2. The method of claim 1, further comprising: The first threshold time offset is reported to a network entity as a beam switching timing parameter capability of the UE.

3. The method of claim 1 , wherein the signaling comprises higher layer signaling to configure, for the UE, the first CORESET pool index value associated with a first plurality of CORESET sets and a second CORESET pool index value associated with a second plurality of CORESET sets.

4. The method of claim 1, wherein the UE supports concurrent reception of multiple beams and multiple default QCL assumptions for multiple DCI (multi-DCI) multiple transmit receive (mTRP) communications.

5. The method of claim 1 , wherein applying the QCL assumption to receiving the A-CSI-RS based at least in part on the first CORESET pool index value comprises: Identifying whether one or more downlink signals are in the same one or more symbols as the A-CSI-RS; as well as Identifying whether the one or more downlink signals are associated with the first CORESET pool index value.

6. The method of claim 1 , wherein applying the QCL assumption to receiving the A-CSI-RS comprises: When another downlink signal is in the same one or more symbols as the A-CSI-RS and is associated with the first CORESET pool index value, applying the QCL assumption for the other downlink signal to receiving the A-CSI-RS.

7. The method of claim 6, wherein the another downlink signal comprises: a physical downlink shared channel (PDSCH) transmission scheduled by a physical downlink control channel (PDCCH) associated with the first CORESET pool index value, wherein a time offset between one or more second DCIs and the PDSCH transmission is equal to or greater than a second threshold time offset, or A second A-CSI-RS scheduled by a PDCCH associated with the first CORESET pool index value, wherein a time offset between the one or more second DCIs and the second A-CSI-RS is equal to or greater than the first threshold time offset.

8. The method of claim 5 , wherein when the UE identifies that the one or more downlink signals are in the same one or more symbols as the A-CSI-RS and are not associated with the first CORESET pool index value, applying the QCL assumption to receive the A-CSI-RS comprises: A QCL assumption for one of the one or more downlink signals is used for receiving the A-CSI-RS.

9. The method of claim 8, wherein the QCL hypothesis comprises a QCL hypothesis for a downlink signal associated with a lowest CSI-RS resource identifier (ID) among the one or more downlink signals.

10. The method of claim 5 , wherein when the UE identifies that the one or more downlink signals are in the same one or more symbols as the A-CSI-RS and are not associated with the first CORESET pool index value, applying the QCL assumption to receive the A-CSI-RS comprises: A default QCL assumption associated with the first CORESET pool index value is used for receiving the A-CSI-RS.

11. The method of claim 10, wherein the default QCL hypothesis comprises a QCL hypothesis associated with a lowest CORESET ID associated with the first CORESET pool index value in the CORESET set in a most recent time slot and within an active bandwidth part (BWP) of a serving cell.

12. The method of claim 10, wherein the one or more downlink signals are associated with the same QCL hypothesis.

13. The method of claim 5, wherein applying the QCL assumption comprises: When the UE identifies that a second downlink signal associated with the first CORESET pool index value is not present in the same one or more symbols as the A-CSI-RS, a default QCL assumption associated with the first CORESET pool index value is applied to receiving the A-CSI-RS.

14. The method of claim 13, wherein the default QCL hypothesis comprises a QCL hypothesis associated with a lowest CORESET ID associated with the first CORESET pool index value in the CORESET set in a most recent time slot and within an active bandwidth part (BWP) of a serving cell.

15. The method of claim 1, further comprising: When the time offset is equal to or greater than the first threshold time offset, the QCL assumption indicated in the first DCI is applied to receiving the A-CSI-RS.

16. The method of claim 1, further comprising: A CSI reporting configuration is received that configures one or more A-CSI-RS resource sets for the UE, each A-CSI-RS resource set including a plurality of A-CSI-RS resources, and each A-CSI-RS resource is associated with a transmission configuration indicator (TCI) state.

17. A method for wireless communication by a user equipment (UE), comprising: receiving signaling indicating that at least one transmission configuration indicator (TCI) code point is mapped to two TCI states; receiving first downlink control information (DCI) triggering a set of reference signal (RS) resources for aperiodic channel state information (A-CSI) reporting; as well as When the time offset between the first DCI and the A-CSI-RS resource set is less than a first threshold time offset, a quasi co-location (QCL) assumption is applied to receiving A-CSI-RS using the A-CSI-RS resource set based at least in part on receiving the signaling indicating that the at least one TCI code point is mapped to two TCI states.

18. The method of claim 17, wherein the first threshold time offset comprises a beam switching timing parameter reported as a capability of the UE.

19. The method of claim 17, further comprising: Receiving radio resource control (RRC) signaling configuring multiple TCI states, wherein: a medium access control (MAC) control element (MAC-CE) activating a subset of the plurality of TCI states for receiving a physical downlink shared channel (PDSCH) transmission; Mapping, by the MAC-CE, a plurality of TCI code points to one or more TCI states in the subset of the plurality of TCI states; The second DCI indicates one of the plurality of TCI code points; and The UE supports concurrent reception of multiple beams and multiple default QCL assumptions for single DCI multiple transmit receive (mTRP) communications.

20. The method of claim 17, wherein applying the QCL assumption to receiving the A-CSI-RS comprises: It is identified whether one or more downlink signals are in the same one or more symbols as the A-CSI-RS.

21. The method of claim 20 , wherein when the UE identifies a downlink signal that is in the same one or more symbols as the A-CSI-RS and is scheduled by a second DCI with a time offset between the second DCI and the downlink signal, and the second DCI indicates two TCI states, applying the QCL assumption to receiving the A-CSI-RS comprises: A first indicated TCI state of two TCI states is applied as the QCL assumption for receiving the A-CSI-RS.

22. The method of claim 21 , wherein the downlink signal is a physical downlink shared channel (PDSCH) transmission associated with the two TCI states indicated by the second DCI.

23. The method of claim 20, wherein when the UE identifies that the one or more downlink signals are in the same one or more symbols as the A-CSI-RS and indicate the same TCI state, applying the QCL assumption to receiving the A-CSI-RS comprises: A QCL assumption for one of the one or more downlink signals is applied to receiving the A-CSI-RS.

24. The method of claim 23, wherein the one or more downlink signals comprise: The physical downlink shared channel (PDSCH) is scheduled with an offset from a DCI scheduling the PDSCH to the PDSCH that is equal to or greater than a second threshold time offset, or Another A-CSI-RS is scheduled with an offset from the DCI scheduling the A-CSI-RS to the A-CSI-RS that is greater than or equal to the first threshold time offset.

25. The method of claim 23 , wherein when the UE identifies that a plurality of downlink signals are in the same one or more symbols as the A-CSI-RS, wherein the plurality of downlink signals are not received in the same TCI state, applying the QCL assumption to receiving the A-CSI-RS further comprises: When the plurality of downlink signals include a physical downlink shared channel (PDSCH), applying a QCL assumption used for PDSCH transmission to receiving the A-CSI-RS; When the plurality of downlink signals include the A-CSI-RS, applying a QCL assumption for another A-CSI-RS to receiving the A-CSI-RS; as well as When the plurality of downlink signals include a periodic CSI-RS or a semi-persistent CSI-RS, a QCL assumption for the periodic CSI-RS or the semi-persistent CSI-RS is applied to receiving the A-CSI-RS.

26. The method of claim 25, wherein applying the QCL assumption to receiving the A-CSI-RS comprises: When the multiple downlink signals include multiple periodic CSI-RSs or semi-persistent CSI-RSs, a QCL assumption for a CSI-RS periodicity or semi-persistent CSI-RS having a lowest CSI-RS resource identifier (ID) is applied to receiving the A-CSI-RS.

27. The method of claim 20, wherein when the UE identifies that no other downlink signal is in the same one or more symbols as the A-CSI-RS, applying the QCL assumption to receiving the A-CSI-RS further comprises: A default QCL assumption is applied to receive the A-CSI-RS.

28. The method of claim 27, wherein the default QCL assumption comprises a QCL assumption associated with a first TCI state indicating a lowest TCI codepoint of a plurality of TCI states.

29. The method of claim 17, further comprising: When the time offset is equal to or greater than the first threshold time offset, the QCL assumption indicated in the first DCI is applied to receiving the A-CSI-RS.

30. A method for wireless communication by a node, comprising: Configuring a user equipment (UE) with a plurality of control resource set (CORESET) pool index values, wherein each CORESET pool index value is associated with a different CORESET set; sending, to the UE, first downlink control information (DCI) triggering an aperiodic channel state information (A-CSI) reference signal (RS) resource set for A-CSI reporting, wherein the first DCI is sent in a first CORESET in the different CORESET sets, and wherein the first DCI is associated with a first CORESET pool index value in the plurality of CORESET pool index values; as well as When the time offset between the first DCI and the A-CSI-RS resource set is less than a first threshold time offset, a quasi co-location (QCL) assumption is applied to sending A-CSI-RS using the A-CSI-RS resource set based at least in part on the first CORESET pool index value.

31. The method of claim 30, further comprising: A report of the first threshold time offset is received from the UE as a beam switching timing parameter capability of the UE.

32. The method of claim 30, wherein the signaling comprises higher layer signaling to configure the UE with the first CORESET pool index value associated with a first plurality of CORESET sets and a second CORESET pool index value associated with a second plurality of CORESET sets.

33. The method of claim 30, wherein applying the QCL assumption to transmitting the A-CSI-RS comprises: When another downlink signal is in the same one or more symbols as the A-CSI-RS and is associated with the first CORESET pool index value, applying the QCL assumption used for the other downlink signal to transmitting the A-CSI-RS.

34. The method of claim 30, wherein applying the QCL assumption to transmitting the A-CSI-RS based at least in part on the first CORESET pool index value comprises: Identifying whether one or more downlink signals are in the same one or more symbols as the A-CSI-RS; as well as Identifying whether the one or more downlink signals are associated with the first CORESET pool index value.

35. A method for wireless communication by a node, comprising: sending signaling to a user equipment (UE) indicating that at least one transmission configuration indicator (TCI) code point is mapped to two TCI states; sending, to the UE, first downlink control information (DCI) triggering an aperiodic channel state information (A-CSI) reference signal (RS) resource set for A-CSI reporting; as well as When the time offset between the first DCI and the A-CSI-RS resource set is less than a first threshold time offset, a quasi co-location (QCL) assumption is applied to sending A-CSI-RS using the A-CSI-RS resource set based at least in part on the signaling indicating that the at least one TCI code point is mapped to two TCI states.

36. The method of claim 35, wherein the first threshold time offset comprises a beam switching timing parameter reported as a capability of the UE.

37. The method of claim 35, further comprising: Sending radio resource control (RRC) signaling to configure multiple TCI states, where: activating, by a medium access control (MAC) control element (MAC-CE), a subset of the plurality of TCI states for sending a physical downlink shared channel (PDSCH) transmission; Mapping, by the MAC-CE, a plurality of TCI code points to one or more TCI states in the subset of the plurality of TCI states; The second DCI indicates one of the plurality of TCI code points; and The UE supports concurrent reception of multiple beams and multiple default QCL assumptions for single DCI multiple transmit receive (mTRP) communications.

38. The method of claim 35, wherein applying the QCL assumption to transmitting the A-CSI-RS comprises: It is identified whether one or more downlink signals are in the same one or more symbols as the A-CSI-RS.

39. An apparatus for wireless communication, comprising: a memory having computer executable code stored thereon; as well as at least one processor coupled to the memory, the at least one processor configured to execute the computer-executable code and cause the apparatus to: receiving signaling to configure a plurality of control resource set (CORESET) pool index values for the apparatus, wherein each CORESET pool index value is associated with a different CORESET set; receiving first downlink control information (DCI) triggering an aperiodic channel state information (A-CSI) reference signal (RS) resource set for A-CSI reporting, wherein the first DCI is received in a first CORESET in the different CORESET sets, and wherein the first CORESET is associated with a first CORESET pool index value in the plurality of CORESET pool index values; as well as When the time offset between the first DCI and the A-CSI-RS resource set is less than a first threshold time offset, a quasi co-location (QCL) assumption is applied to receiving A-CSI-RS using the A-CSI-RS resource set based at least in part on the first CORESET pool index value.

40. The apparatus of claim 39, wherein the at least one processor is configured to cause the apparatus to: report the first threshold time offset to a network entity as a beam switching timing parameter capability of the apparatus.

41. The apparatus of claim 39, wherein the signaling comprises higher layer signaling to configure the apparatus with the first CORESET pool index value associated with a first plurality of CORESET sets and a second CORESET pool index value associated with a second plurality of CORESET sets.

42. The apparatus of claim 39, wherein the apparatus supports concurrent reception of multiple beams and multiple default QCL assumptions for multiple DCI (multi-DCI) multiple transmit receive (mTRP) communications.

43. The apparatus of claim 39, wherein the at least one processor is configured to cause the apparatus to apply the QCL assumption to receiving the A-CSI-RS based at least in part on the first CORESET pool index value comprises the at least one processor being configured to cause the apparatus to: Identifying whether one or more downlink signals are in the same one or more symbols as the A-CSI-RS; and Identifying whether the one or more downlink signals are associated with the first CORESET pool index value.

44. The apparatus of claim 39, wherein the at least one processor being configured to cause the apparatus to apply the QCL assumption to receiving the A-CSI-RS comprises the at least one processor being configured to cause the apparatus to: When another downlink signal is in the same one or more symbols as the A-CSI-RS and is associated with the first CORESET pool index value, applying the QCL assumption for the other downlink signal to receiving the A-CSI-RS.

45. The apparatus of claim 44, wherein the another downlink signal comprises: a physical downlink shared channel (PDSCH) transmission scheduled by a physical downlink control channel (PDCCH) associated with the first CORESET pool index value, wherein a time offset between one or more second DCIs and the PDSCH transmission is equal to or greater than a second threshold time offset, or A second A-CSI-RS scheduled by a PDCCH associated with the first CORESET pool index value, wherein a time offset between the one or more second DCIs and the second A-CSI-RS is equal to or greater than the first threshold time offset.

46. The apparatus of claim 43 , wherein when the apparatus identifies that the one or more downlink signals are in the same one or more symbols as the A-CSI-RS and are not associated with the first CORESET pool index value, the at least one processor being configured to cause the apparatus to apply the QCL assumption to receiving the A-CSI-RS comprises the at least one processor being configured to cause the apparatus to: A QCL assumption for one of the one or more downlink signals is used for receiving the A-CSI-RS.

47. The apparatus of claim 46, wherein the QCL hypothesis comprises a QCL hypothesis for a downlink signal associated with a lowest CSI-RS resource identifier (ID) among the one or more downlink signals.

48. The apparatus of claim 43 , wherein when the apparatus identifies that the one or more downlink signals are in the same one or more symbols as the A-CSI-RS and are not associated with the first CORESET pool index value, the at least one processor being configured to cause the apparatus to apply the QCL assumption to receiving the A-CSI-RS comprises the at least one processor being configured to cause the apparatus to: A default QCL assumption associated with the first CORESET pool index value is used for receiving the A-CSI-RS.

49. The apparatus of claim 48, wherein the default QCL hypothesis comprises a QCL hypothesis associated with a lowest CORESET ID associated with the first CORESET pool index value in the CORESET set in a most recent time slot and within an active bandwidth part (BWP) of a serving cell.

50. The apparatus of claim 48, wherein the one or more downlink signals are associated with the same QCL hypothesis.

51. The apparatus of claim 43, wherein the at least one processor being configured to cause the apparatus to apply the QCL assumption comprises the at least one processor being configured to cause the apparatus to: When the apparatus identifies that a second downlink signal associated with the first CORESET pool index value is not present in the same one or more symbols as the A-CSI-RS, a default QCL assumption associated with the first CORESET pool index value is applied to receiving the A-CSI-RS.

52. The apparatus of claim 51 , wherein the default QCL hypothesis comprises a QCL hypothesis associated with a lowest CORESET ID associated with the first CORESET pool index value in the CORESET set in a most recent time slot and within an active bandwidth part (BWP) of a serving cell.

53. The apparatus of claim 39, wherein the at least one processor is configured to cause the apparatus to: When the time offset is equal to or greater than the first threshold time offset, the QCL assumption indicated in the first DCI is applied to receiving the A-CSI-RS.

54. The apparatus of claim 39, wherein the at least one processor is configured to cause the apparatus to: A CSI reporting configuration is received that configures one or more A-CSI-RS resource sets for the apparatus, each A-CSI-RS resource set including a plurality of A-CSI-RS resources, and each A-CSI-RS resource is associated with a transmission configuration indicator (TCI) state.

55. An apparatus for wireless communication, comprising: a memory having computer executable code stored thereon; as well as at least one processor coupled to the memory, the at least one processor configured to execute the computer-executable code and cause the apparatus to: receiving signaling indicating that at least one transmission configuration indicator (TCI) code point is mapped to two TCI states; receiving first downlink control information (DCI) triggering a set of reference signal (RS) resources for aperiodic channel state information (A-CSI) reporting; as well as When the time offset between the first DCI and the A-CSI-RS resource set is less than a first threshold time offset, a quasi co-location (QCL) assumption is applied to receiving A-CSI-RS using the A-CSI-RS resource set based at least in part on receiving the signaling indicating that the at least one TCI code point is mapped to two TCI states.

56. The apparatus of claim 55, wherein the first threshold time offset comprises a beam switching timing parameter reported as a capability of the apparatus.

57. The apparatus of claim 55, wherein: The at least one processor is configured to cause the apparatus to receive radio resource control (RRC) signaling configuring a plurality of TCI states; a medium access control (MAC) control element (MAC-CE) activating a subset of the plurality of TCI states for receiving a physical downlink shared channel (PDSCH) transmission; Mapping, by the MAC-CE, a plurality of TCI code points to one or more TCI states in the subset of the plurality of TCI states; The second DCI indicates one of the plurality of TCI code points; and The device supports concurrent reception of multiple beams and multiple default QCL assumptions for single DCI multiple transmit receive (mTRP) communications.

58. The apparatus of claim 55, wherein the at least one processor being configured to cause the apparatus to apply the QCL assumption to receiving the A-CSI-RS comprises the at least one processor being configured to cause the apparatus to: It is identified whether one or more downlink signals are in the same one or more symbols as the A-CSI-RS.

59. The apparatus of claim 58 , wherein when the apparatus identifies that a downlink signal is in the same one or more symbols as the A-CSI-RS and is scheduled by a second DCI with a time offset between the second DCI and the downlink signal, and the second DCI indicates two TCI states, the at least one processor is configured to cause the apparatus to apply the QCL assumption to receiving the A-CSI-RS, comprises the at least one processor being configured to cause the apparatus to: A first indicated TCI state of two TCI states is applied as the QCL assumption for receiving the A-CSI-RS.

60. The apparatus of claim 59, wherein the downlink signal is a physical downlink shared channel (PDSCH) transmission associated with the two TCI states indicated by the second DCI.

61. The apparatus of claim 58, wherein when the apparatus identifies that the one or more downlink signals are in the same one or more symbols as the A-CSI-RS and indicate the same TCI state, the at least one processor is configured to cause the apparatus to apply the QCL assumption to receiving the A-CSI-RS comprises the at least one processor being configured to cause the apparatus to: A QCL assumption for one of the one or more downlink signals is applied to receiving the A-CSI-RS.

62. The apparatus of claim 61 , wherein the one or more downlink signals comprise: The physical downlink shared channel (PDSCH) is scheduled with an offset from a DCI scheduling the PDSCH to the PDSCH that is equal to or greater than a second threshold time offset, or Another A-CSI-RS is scheduled with an offset from the DCI scheduling the A-CSI-RS to the A-CSI-RS that is greater than or equal to the first threshold time offset.

63. The apparatus of claim 61 , wherein when the apparatus identifies that a plurality of downlink signals are in the same one or more symbols as the A-CSI-RS, wherein the plurality of downlink signals are not received in the same TCI state, the at least one processor being configured to cause the apparatus to apply the QCL assumption to receiving the A-CSI-RS further comprises the at least one processor being configured to cause the apparatus to: When the plurality of downlink signals include a physical downlink shared channel (PDSCH), applying a QCL assumption for the PDSCH to receiving the A-CSI-RS; When the plurality of downlink signals include the A-CSI-RS, applying a QCL assumption for another A-CSI-RS to receiving the A-CSI-RS; and When the plurality of downlink signals include a periodic CSI-RS or a semi-persistent CSI-RS, a QCL assumption for the periodic CSI-RS or the semi-persistent CSI-RS is applied to receiving the A-CSI-RS.

64. An apparatus as described in claim 63, wherein the at least one processor is configured to cause the apparatus to apply the QCL assumption to receiving the A-CSI-RS, including the at least one processor being configured to cause the apparatus to: when the multiple downlink signals include multiple periodic CSI-RSs or semi-persistent CSI-RSs, apply the QCL assumption for the CSI-RS periodic or semi-persistent CSI-RS with the lowest CSI-RS resource identifier (ID) to receiving the A-CSI-RS.

65. The apparatus of claim 58, wherein when the apparatus identifies that no other downlink signals are in the same one or more symbols as the A-CSI-RS, the at least one processor being configured to cause the apparatus to apply the QCL assumption to receiving the A-CSI-RS further comprises the at least one processor being configured to cause the apparatus to: A default QCL assumption is applied to receive the A-CSI-RS.

66. The apparatus of claim 65, wherein the default QCL assumption comprises a QCL assumption associated with a first TCI state indicating a lowest TCI codepoint of a plurality of TCI states.

67. The apparatus of claim 55, wherein the at least one processor is configured to cause the apparatus to: When the time offset is equal to or greater than the first threshold time offset, the QCL assumption indicated in the first DCI is applied to receiving the A-CSI-RS.

68. An apparatus for wireless communication, comprising: a memory having computer executable code stored thereon; as well as at least one processor coupled to the memory, the at least one processor configured to execute the computer-executable code and cause the apparatus to: Configuring a user equipment (UE) with a plurality of control resource set (CORESET) pool index values, wherein each CORESET pool index value is associated with a different CORESET set; sending, to the UE, first downlink control information (DCI) triggering an aperiodic channel state information (A-CSI) reference signal (RS) resource set for A-CSI reporting, wherein the first DCI is sent in a first CORESET in the different CORESET sets, and wherein the first DCI is associated with a first CORESET pool index value in the plurality of CORESET pool index values; as well as When the time offset between the first DCI and the A-CSI-RS resource set is less than a first threshold time offset, a quasi co-location (QCL) assumption is applied to sending A-CSI-RS using the A-CSI-RS resource set based at least in part on the first CORESET pool index value.

69. The apparatus of claim 68, wherein the at least one processor is configured to cause the apparatus to: A report of the first threshold time offset is received from the UE as a beam switching timing parameter capability of the UE.

70. The apparatus of claim 68, wherein the signaling comprises higher layer signaling to configure the UE with the first CORESET pool index value associated with a first plurality of CORESET sets and a second CORESET pool index value associated with a second plurality of CORESET sets.

71. The apparatus of claim 68, wherein the at least one processor being configured to cause the apparatus to apply the QCL assumption to transmitting the A-CSI-RS comprises the at least one processor being configured to cause the apparatus to: When another downlink signal is in the same one or more symbols as the A-CSI-RS and is associated with the first CORESET pool index value, applying the QCL assumption used for the other downlink signal to transmitting the A-CSI-RS.

72. The apparatus of claim 68, wherein the at least one processor is configured to cause the apparatus to apply the QCL assumption to transmitting the A-CSI-RS based at least in part on the first CORESET pool index value comprises the at least one processor being configured to cause the apparatus to: Identifying whether one or more downlink signals are in the same one or more symbols as the A-CSI-RS; and Identifying whether the one or more downlink signals are associated with the first CORESET pool index value.

73. An apparatus for wireless communication, comprising: a memory having computer executable code stored thereon; as well as at least one processor coupled to the memory, the at least one processor configured to execute the computer-executable code and cause the apparatus to: sending signaling to a user equipment (UE) indicating that at least one transmission configuration indicator (TCI) code point is mapped to two TCI states; sending, to the UE, first downlink control information (DCI) triggering an aperiodic channel state information (A-CSI) reference signal (RS) resource set for A-CSI reporting; as well as When the time offset between the first DCI and the A-CSI-RS resource set is less than a first threshold time offset, a quasi co-location (QCL) assumption is applied to sending A-CSI-RS using the A-CSI-RS resource set based at least in part on the signaling indicating that the at least one TCI code point is mapped to two TCI states.

74. The apparatus of claim 73, wherein the first threshold time offset comprises a beam switching timing parameter reported as a capability of the UE.

75. The apparatus of claim 73, wherein: The at least one processor is configured to cause the apparatus to send radio resource control (RRC) signaling configuring a plurality of TCI states; activating, by a medium access control (MAC) control element (MAC-CE), a subset of the plurality of TCI states for sending a physical downlink shared channel (PDSCH) transmission; Mapping, by the MAC-CE, a plurality of TCI code points to one or more TCI states in the subset of the plurality of TCI states; The second DCI indicates one of the plurality of TCI code points; and The UE supports concurrent reception of multiple beams and multiple default QCL assumptions for single DCI multiple transmit receive (mTRP) communications.

76. The apparatus of claim 73, wherein the at least one processor being configured to cause the apparatus to apply the QCL assumption to transmitting the A-CSI-RS comprises the at least one processor being configured to cause the apparatus to: It is identified whether one or more downlink signals are in the same one or more symbols as the A-CSI-RS.

77. A device for wireless communication, comprising: Apparatus for performing the method according to any one of claims 1 to 38.

78. A computer-readable medium storing instructions that, when executed by at least one processor of an apparatus for wireless communication, cause the at least one processor to perform the method of any one of claims 1-38.

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