Reports the selected demodulation reference signal configuration and related channel state feedback

Abstract

Various aspects of the present disclosure generally relate to wireless communications. In some aspects, a user equipment may select a recommended demodulation reference signal (DMRS) configuration for downlink communication from a set of DMRS configurations, the recommended DMRS configuration being associated with a set of DMRS parameters; and transmit an indication of the recommended DMRS configuration. Numerous other aspects are provided.

Description

[0001] Public domain

[0002] Aspects of the present disclosure relate generally to wireless communications, and more particularly to techniques and apparatus for reporting selected demodulation reference signal configurations and related channel state feedback.

[0003] background

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

[0005] A wireless network may include several base stations (BSs) that can support communication of several user equipments (UEs). User equipments (UEs) may communicate with base stations (BSs) via downlinks and uplinks. Downlinks (or forward links) refer to the communication link from a BS to a UE, while uplinks (or reverse links) refer to the communication link from a UE to a BS. As will be described in more detail herein, a BS may be referred to as a Node B, gNB, access point (AP), radio head, transmit receive point (TRP), new radio (NR) BS, 5G Node B, and the like.

[0006] The above multiple access technologies have been adopted in various telecommunication standards to provide a common protocol that enables different user equipment to communicate at city, country, region, and even global levels. New Radio (NR) (which may also be referred to as 5G) is an enhancement set to the LTE mobile standard promulgated by the Third Generation Partnership Project (3GPP). NR is designed to better support mobile broadband Internet access by using orthogonal frequency division multiplexing (OFDM) (CP-OFDM) with cyclic prefix (CP) on the downlink (DL), using CP-OFDM and / or SC-FDM (e.g., also known as discrete Fourier transform spread OFDM (DFT-s-OFDM)) on the uplink (UL), and supporting beamforming, multiple input multiple output (MIMO) antenna technology and carrier aggregation to improve spectrum efficiency, reduce costs, improve services, utilize new spectrum, and better integrate with other open standards. As the demand for mobile broadband access continues to grow, further improvements to LTE, NR and other radio access technologies are still useful.

[0007] Overview

[0008] In some aspects, a wireless communication method performed by a user equipment (UE) includes: selecting a recommended demodulation reference signal (DMRS) configuration for a physical downlink shared channel (PDSCH) from a set of DMRS configurations, the recommended DMRS configuration being associated with a set of DMRS parameters; and transmitting an indication of the recommended DMRS configuration.

[0009] In some aspects, a wireless communication method performed by a base station includes: receiving a channel state feedback (CSF) report and an indication of a recommended DMRS configuration associated with one or more parameters used by a UE to generate the CSF report; and selecting transmission parameters including a DMRS configuration to be used for a PDSCH based at least in part on the CSF report and the recommended DMRS configuration.

[0010] In some aspects, a non-transitory computer-readable medium stores an instruction set for wireless communication, the instruction set comprising one or more instructions that, when executed by one or more processors of a UE, causes the UE to: select a recommended DMRS configuration for a PDSCH from a DMRS configuration set, the recommended DMRS configuration being associated with a DMRS parameter set; and transmit an indication of the recommended DMRS configuration.

[0011] In some aspects, a non-transitory computer-readable medium stores an instruction set for wireless communication, the instruction set comprising one or more instructions that, when executed by one or more processors of a base station, causes the base station to: receive a CSF report and an indication of a recommended DMRS configuration associated with one or more parameters used by a UE to generate the CSF report; and select transmission parameters including a DMRS configuration to be used for a PDSCH based at least in part on the CSF report and the recommended DMRS configuration.

[0012] In some aspects, a UE for wireless communication includes a memory; and one or more processors operatively coupled to the memory, the memory and the one or more processors being configured to: select a recommended DMRS configuration for a PDSCH from a DMRS configuration set, the recommended DMRS configuration being associated with a DMRS parameter set; and transmit an indication of the recommended DMRS configuration.

[0013] In some aspects, a base station for wireless communication includes a memory; and one or more processors operatively coupled to the memory, the memory and the one or more processors configured to: receive a CSF report and an indication of a recommended DMRS configuration associated with one or more parameters used by a UE to generate the CSF report; and select transmission parameters including a DMRS configuration to be used for a PDSCH based at least in part on the CSF report and the recommended DMRS configuration.

[0014]

[0011] In some aspects, an apparatus for wireless communications includes means for selecting a recommended DMRS configuration for a PDSCH from a set of DMRS configurations, the recommended DMRS configuration associated with a set of DMRS parameters, and means for transmitting an indication of the recommended DMRS configuration.

[0015] In some aspects, an apparatus for wireless communications includes: means for receiving a CSF report and an indication of a recommended DMRS configuration associated with one or more parameters used by a UE to generate the CSF report; and means for selecting transmission parameters including a DMRS configuration to be used for a PDSCH based at least in part on the CSF report and the recommended DMRS configuration.

[0016] Aspects generally include methods, apparatus, systems, computer program products, non-transitory computer-readable media, user equipment, base stations, wireless communication devices, and / or processing systems as substantially described herein with reference to and as illustrated in the accompanying figures and specification.

[0017] The foregoing has broadly outlined the features and technical advantages of examples according to the present disclosure in an effort to make the following detailed description better understood. Additional features and advantages will be described hereinafter. The disclosed concepts and specific examples can be easily used as a basis for modifying or designing other structures for implementing the same purpose as the present disclosure. Such equivalent constructions do not depart from the scope of the appended claims. The characteristics of the concepts disclosed herein, both in terms of their organization and method of operation, and the associated advantages will be better understood by considering the following description in conjunction with the accompanying drawings. Each of the accompanying drawings is provided for the purpose of illustration and description and is not intended to define limitations on the claims. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to understand the above-stated features of the present disclosure in detail, the above briefly summarized content may be described in more detail with reference to various aspects, some of which are illustrated in the accompanying drawings. However, it should be noted that the accompanying drawings only illustrate certain typical aspects of the present disclosure and should not be considered to limit its scope, as the description may allow for other equally effective aspects. The same reference numerals in different drawings may identify the same or similar elements.

[0020] Figure 1 is a diagram illustrating an example of a wireless network in accordance with aspects of the present disclosure.

[0021] Figure 2 is a diagram illustrating an example of a base station and a UE in communication in a wireless network according to aspects of the present disclosure.

[0022] Figure 3 is a diagram illustrating an example of channel state feedback reporting according to aspects of the present disclosure.

[0023] Figure 4 is a diagram illustrating an example associated with reporting channel state feedback and one or more related demodulation reference signal configurations in accordance with aspects of the present disclosure.

[0024] Figure 5-7 is a diagram illustrating examples associated with demodulation reference signal patterns for different physical downlink shared channel allocation durations according to aspects of the present disclosure.

[0025] Figure 8 and 9 is a diagram illustrating an example associated with a type of a demodulation reference signal according to aspects of the present disclosure.

[0026] Fig.10 and 11 is a diagram illustrating example procedures associated with reporting channel state feedback and related demodulation reference signal configurations in accordance with aspects of the present disclosure.

[0027] Detailed Description

[0028] The various aspects of the present disclosure are described more fully below with reference to the accompanying drawings. However, the present disclosure can be implemented in many different forms and should not be interpreted as being limited to any specific structure or function given throughout the present disclosure. On the contrary, these aspects are provided to make the present disclosure thorough and complete, and it will fully convey the scope of the present disclosure to those skilled in the art. Based on the teachings of this article, those skilled in the art will appreciate that the scope of the present disclosure is intended to cover any aspect of the present disclosure disclosed herein, whether it is independently implemented or implemented in combination with any other aspect of the present disclosure. For example, any number of aspects set forth herein can be used to implement a device or practice method. In addition, the scope of the present disclosure is intended to cover such devices or methods practiced using supplements or other other structures, functionality, or structures and functionality as the various aspects of the present disclosure set forth herein. It should be understood that any aspect of the present disclosure disclosed herein can be implemented by one or more elements of the claims.

[0029] Several aspects of telecommunication systems will now be presented with reference to various devices and techniques. These devices and techniques will be described in the following detailed description and illustrated in the accompanying drawings by various blocks, modules, components, circuits, steps, processes, algorithms, etc. (collectively referred to as "elements"). These elements can be implemented using hardware, software, or a combination thereof. Whether such elements are implemented as hardware or software depends on the specific application and the design constraints imposed on the overall system.

[0030] It should be noted that although various aspects may be described herein using terminology associated with 5G or NR radio access technology (RAT), various aspects of the present disclosure may be applied to other RATs, such as 3G RAT, 4G RAT, and / or RATs after 5G (e.g., 6G).

[0031] Figure 1 1 is a diagram illustrating an example of a wireless network 100 according to various aspects of the present disclosure. The wireless network 100 may be a 5G (NR) network, an LTE network, etc. or may include elements thereof. The wireless network 100 may include several base stations 110 (shown as BS 110a, BS 110b, BS 110c, and BS 110d) and other network entities. A base station (BS) is an entity that communicates with a user equipment (UE) and may also be referred to as an NR BS, a B node, a gNB, a 5G B node (NB), an access point, a transmit receive point (TRP), etc. Each BS may provide communication coverage for a specific geographic area. In 3GPP, the term "cell" may refer to a coverage area of ​​a BS and / or a BS subsystem serving the coverage area, depending on the context in which the term is used.

[0032] A BS may provide communication coverage for a macro cell, a pico cell, a femto cell, and / or another type of cell. A macro cell may cover a relatively large geographic area (e.g., several kilometers in radius) and may allow unrestricted access by UEs with service subscriptions. A pico cell may cover a relatively small geographic area and may allow unrestricted access by UEs with service subscriptions. A femto cell may cover a relatively small geographic area (e.g., a residence) and may allow restricted access by UEs associated with the femto cell (e.g., UEs in a closed subscriber group (CSG)). A BS for a macro cell may be referred to as a macro BS. A BS for a pico cell may be referred to as a pico BS. A BS for a femto cell may be referred to as a femto BS or a home BS. In Figure 1 In the example shown in , BS 110a may be a macro BS for macro cell 102a, BS 110b may be a pico BS for pico cell 102b, and BS 110c may be a femto BS for femto cell 102c. The BS may support one or more (e.g., three) cells. The terms "eNB", "base station", "NR BS", "gNB", "TRP", "AP", "B node", "5G NB", and "cell" may be used interchangeably herein.

[0033] In some aspects, the cells may not necessarily be stationary, and the geographic area of ​​the cells may move depending on the location of the mobile BS. In some aspects, the BSs may be interconnected to each other and / or to one or more other BSs or network nodes (not shown) in the wireless network 100 via various types of backhaul interfaces (such as direct physical connections, virtual networks, etc.) using any suitable transport network.

[0034] The wireless network 100 may also include a relay station. A relay station is an entity that can receive transmissions of data from an upstream station (e.g., a BS or a UE) and send transmissions of the data to a downstream station (e.g., a UE or a BS). A relay station may also be a UE that can relay transmissions for other UEs. Figure 1 In the example shown in , a relay station 110d may communicate with a macro BS 110a and a UE 120d to facilitate communication between the BS 110a and the UE 120d. A relay station may also be referred to as a relay BS, a relay base station, a relay, or the like.

[0035] The wireless network 100 may be a heterogeneous network including different types of BSs (e.g., macro BSs, pico BSs, femto BSs, relay BSs, etc.). These different types of BSs may have different transmit power levels, different coverage areas, and different effects on interference in the wireless network 100. For example, a macro BS may have a high transmit power level (e.g., 5 to 40 watts), while a pico BS, a femto BS, and a relay BS may have a lower transmit power level (e.g., 0.1 to 2 watts).

[0036] A network controller 130 may be coupled to a set of BSs and may provide coordination and control of these BSs. The network controller 130 may communicate with each BS via a backhaul. The BSs may also communicate with each other directly or indirectly, for example, via a wireless or wired backhaul.

[0037] UEs 120 (e.g., 120a, 120b, 120c) may be dispersed throughout the wireless network 100, and each UE may be stationary or mobile. UEs may also be referred to as access terminals, terminals, mobile stations, subscriber units, stations, etc. A UE may be a cellular phone (e.g., a smart phone), a personal digital assistant (PDA), a wireless modem, a wireless communication device, a handheld device, a laptop computer, a cordless phone, a wireless local loop (WLL) station, a tablet, a camera, a gaming device, a netbook, a smartbook, an ultrabook, a medical device or equipment, a biometric sensor / device, a wearable device (smart watch, smart clothing, smart glasses, smart wristband, smart jewelry (e.g., smart ring, smart bracelet)), an entertainment device (e.g., a music or video device, or a satellite radio), a vehicle component or sensor, a smart meter / sensor, an industrial manufacturing equipment, a global positioning system device, or any other suitable device configured to communicate via a wireless or wired medium.

[0038] Some UEs may be considered as machine type communication (MTC) UEs, or evolved or enhanced machine type communication (eMTC) UEs. MTC and eMTC UEs include, for example, robots, drones, remote devices, sensors, meters, monitors, location tags, etc., which may communicate with a base station, another device (e.g., a remote device), or some other entity. A wireless node may 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 as Internet of Things (IoT) devices, and / or may be implemented as NB-IoT (narrowband Internet of Things) devices. Some UEs may be considered as client equipment (CPE). UE 120 may be included inside a housing that houses components of UE 120, such as a processor component, a memory component, and the like. In some aspects, a processor component and a memory component may be coupled together. For example, a processor component (e.g., one or more processors) and a memory component (e.g., a memory) may be operationally coupled, communicatively coupled, electronically coupled, electrically coupled, and the like.

[0039] In general, any number of wireless networks may be deployed in a given geographic area. Each wireless network may support a specific RAT and may operate on one or more frequencies. RAT may also be referred to as radio technology, air interface, etc. Frequency may also be referred to as carrier, frequency channel, etc. Each frequency may support a single RAT in a given geographic area to avoid interference between wireless networks of different RATs. In some cases, NR or 5G RAT networks may be deployed.

[0040] In some aspects, two or more UEs 120 (e.g., shown as UE 120a and UE 120e) may communicate directly (e.g., without using base station 110 as an intermediary to communicate with each other) using one or more sidelink channels. For example, UE 120 may communicate using peer-to-peer (P2P) communication, device-to-device (D2D) communication, vehicle-to-everything (V2X) protocols (e.g., which may include vehicle-to-vehicle (V2V) protocols, vehicle-to-infrastructure (V2I) protocols, etc.), mesh networks, etc. In this case, UE 120 may perform scheduling operations, resource selection operations, and / or other operations described elsewhere herein as being performed by base station 110.

[0041] As indicated above, Figure 1 are provided as examples. Other examples may differ from those described herein. Figure 1 Examples described.

[0042] Figure 2is a diagram illustrating an example 200 of a base station 110 and a UE 120 in communication in a wireless network 100 in accordance with various aspects of the present disclosure. The base station 110 may be equipped with T antennas 234a through 234t and the UE 120 may be equipped with R antennas 252a through 252r, where in general T≥1 and R≥1.

[0043] At the base station 110, the transmit processor 220 may receive data for one or more UEs from the data source 212, select one or more modulation and coding schemes (MCS) for each UE based at least in part on a channel quality indicator (CQI) received from the UE, process (e.g., encode and modulate) the data for the UE based at least in part on the MCS selected for each UE, and provide data symbols for all UEs. The transmit processor 220 may also process system information (e.g., for semi-static resource partitioning information (SRPI), etc.) and control information (e.g., CQI requests, grants, upper layer signaling, etc.), and provide overhead symbols and control symbols. The transmit processor 220 may also generate reference symbols for reference signals (e.g., cell-specific reference signals (CRS)), DMRS, etc.) and synchronization signals (e.g., primary synchronization signals (PSS) and secondary synchronization signals (SSS)). A transmit (TX) multiple-input multiple-output (MIMO) processor 230 may perform spatial processing (e.g., precoding) on ​​data symbols, control symbols, overhead symbols, and / or reference symbols, where applicable, and may provide T output symbol streams to T modulators (MODs) 232a through 232t. Each modulator 232 may process a respective output symbol stream (e.g., for OFDM, etc.) to obtain an output sample stream. Each modulator 232 may further process (e.g., convert to analog, amplify, filter, and upconvert) the output sample stream to obtain a downlink signal. The T downlink signals from modulators 232a through 232t may be transmitted via T antennas 234a through 234t, respectively.

[0044] At UE 120, antennas 252a to 252r may receive downlink signals from base station 110 and / or other base stations and may provide received signals to demodulators (DEMODs) 254a to 254r, respectively. Each demodulator 254 may condition (e.g., filter, amplify, downconvert, and digitize) the received signal to obtain input samples. Each demodulator 254 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 R demodulators 254a to 254r, perform MIMO detection on the received symbols where applicable, and provide detected symbols. A receive processor 258 may process (e.g., demodulate and decode) the detected symbols, provide decoded data for UE 120 to a data sink 260, and provide decoded control information and system information to a controller / processor 280. The channel processor may determine reference signal received power (RSRP), received signal strength indicator (RSSI), reference signal received quality (RSRQ), channel quality indicator (CQI), etc. In some aspects, one or more components of UE 120 may be included in housing 284.

[0045] The network controller 130 may include a communication unit 294, a controller / processor 290, and a memory 292. The network controller 130 may include, for example, one or more devices in a core network. The network controller 130 may communicate with the base station 110 via the communication unit 294.

[0046] On the uplink, at the UE 120, a transmit processor 264 may receive and process data from a data source 262 and control information from a controller / processor 280 (e.g., for reports including RSRP, RSSI, RSRQ, CQI, etc.). The transmit processor 264 may also generate reference symbols for one or more reference signals. The symbols from the transmit processor 264 may be precoded by a TX MIMO processor 266, where applicable, further processed by modulators 254a through 254r (e.g., for DFT-s-OFDM, CP-OFDM, etc.), and transmitted to the base station 110. In some aspects, the UE 120 includes a transceiver. The transceiver may include any combination of antenna(s) 252, modulators and / or demodulators 254, a MIMO detector 256, a receive processor 258, a transmit processor 264, and / or a TX MIMO processor 266. The transceiver may be used by a processor (eg, controller / processor 280) and memory 282 to perform aspects of any of the methods described herein, for example, as described with reference to Figure 4-11 as described.

[0047] At the base station 110, uplink signals from the UE 120 and other UEs may be received by the antenna 234, processed by the demodulator 232, detected by the MIMO detector 236 where applicable, and further processed by the receive processor 238 to obtain decoded data and control information transmitted by the UE 120. The receive processor 238 may provide the decoded data to the data sink 239 and the decoded control information to the controller / processor 240. The base station 110 may include a communication unit 244 and communicate with the network controller 130 via the communication unit 244. The base station 110 may include a scheduler 246 to schedule the UE 120 for downlink and / or uplink communications. In some aspects, the base station 110 includes a transceiver. The transceiver may include any combination of antenna(s) 234, modulator and / or demodulator 232, MIMO detector 236, receive processor 238, transmit processor 220, and / or TX MIMO processor 230. The transceiver may be used by a processor (eg, controller / processor 240) and memory 242 to perform aspects of any of the methods described herein, for example, as described with reference to Figure 4-11 as described.

[0048] The controller / processor 240 of the base station 110, the controller / processor 280 of the UE 120, and / or Figure 2 Any other component(s) of the UE 120 may perform one or more techniques associated with reporting CSF and related DMRS configurations, as described in more detail elsewhere herein. For example, the controller / processor 240 of the base station 110, the controller / processor 280 of the UE 120, and / or Figure 2 Any other component of the Fig.10 The process of 1000 Fig.11 The process 1100, and / or the operations of other processes as described herein. The memories 242 and 282 may store data and program codes for the base station 110 and the UE 120, respectively. In some aspects, the memory 242 and / or the memory 282 may include: a non-transitory computer-readable medium storing one or more instructions (e.g., code, program code, etc.) for wireless communication. For example, when the one or more instructions are executed (e.g., directly executed, or executed after compilation, conversion, interpretation, etc.) by one or more processors of the base station 110 and / or the UE 120, the one or more processors, the UE 120, and / or the base station 110 may perform or direct, for example Fig.10 The process of 1000 Fig.11 The process 1100 of , and / or operations of other processes as described herein. In some aspects, executing instructions may include running instructions, converting instructions, compiling instructions, interpreting instructions, etc.

[0049] In some aspects, UE 120 may include: means for selecting a recommended DMRS configuration for PDSCH from a set of DMRS configurations, the recommended DMRS configuration being associated with a set of DMRS parameters; means for transmitting an indication of the recommended DMRS configuration, etc. In some aspects, such means may include in conjunction with Figure 2 One or more components of UE 120 are depicted, such as controller / processor 280, transmit processor 264, TX MIMO processor 266, MOD 254, antenna 252, DEMOD 254, MIMO detector 256, receive processor 258, and the like.

[0050] In some aspects, base station 110 may include: means for receiving a CSF report and an indication of a recommended DMRS configuration associated with one or more parameters used by a UE to generate the CSF report; means for selecting transmission parameters including a DMRS configuration to be used for a PDSCH based at least in part on the CSF report and the recommended DMRS configuration, etc. In some aspects, such means may include combining Figure 2 One or more components of base station 110 are depicted, such as antenna 234, DEMOD 232, MIMO detector 236, receive processor 238, controller / processor 240, transmit processor 220, TX MIMO processor 230, MOD 232, antenna 234, and the like.

[0051] although Figure 2 The blocks in the 200 and 210 are illustrated as different components, but the functions described above with respect to these blocks may be implemented with a single hardware, software, or combined component or a combination of various components. For example, the functions described with respect to the transmit processor 264, the receive processor 258, and / or the TX MIMO processor 266 may be performed by the processor 280 or under the control of the processor 280.

[0052] As indicated above, Figure 2 are provided as examples. Other examples may differ from those described herein. Figure 2 Examples described.

[0053] Figure 3 3 is a diagram illustrating an example 300 of CSF reporting according to aspects of the present disclosure. As shown, a UE and a base station may communicate within a wireless network. The UE and the base station may have established a wireless link and may periodically perform a CSF reporting procedure, as shown.

[0054] like Figure 3As shown by reference numeral 305 in FIG. 1 , a UE may receive one or more channel state information (CSI) reference signals (CSI-RS), CSI interference measurement (CSI-IM) allocations, etc. The UE may evaluate the one or more CSI-RS to determine a channel quality indicator (CQI), a recommended rank indicator (RI), a precoding matrix indicator (PMI), etc. for a corresponding CSI-RS of the one or more CSI-RSs. The UE may determine the CQI based at least in part on a CSI reference resource definition.

[0055] The CSI reference resource definition may provide a definition and / or set of assumptions for the UE to use in evaluating the CSI-RS. For example, the CSI reference resource definition may indicate that the first two symbols (e.g., OFDM symbols) of a physical downlink shared channel (PDSCH) are occupied by control signaling, that the number of PDSCH and DMRS symbols is equal to 12, to assume that the number of front-loaded DMRS symbols is the same as the maximum number of front-loaded symbols configured by a higher layer (e.g., radio resource control (RRC)) parameter (e.g., maxLength) in a DMRS configuration indication (e.g., DMRS-DownlinkConfig), to assume that the number of additional DMRS symbols is the same as the number of additional symbols configured by a higher layer parameter (e.g., DMRS-AdditionalPosition), to assume that the PDSCH symbol does not contain DMRS, and so on.

[0056] As indicated by reference numeral 310, the UE may generate a CSF report based at least in part on the CSI resource definition. For example, the UE may evaluate one or more CSI-RS based at least in part on the CSI reference resource definition to determine a CQI, a recommended RI, a PMI, etc. to determine which RI and PMI are associated with a UE receiving communications with the highest spectral efficiency via a PDSCH and / or a CQI corresponding to a 10% block error rate (BLER) for PDSCH communications. The UE may generate a report to indicate one or more CQIs (e.g., for a selected RI and PMI corresponding to the highest spectral efficiency).

[0057] As indicated by reference numeral 315, the UE may transmit a CSF report to the base station. The base station may determine one or more transmission parameters based at least in part on the CSF report.

[0058] In this way, the base station can determine the transmission parameters to be used for PDSCH allocation based at least in part on the definition of CSI reference resources that reference one or more parameters of the higher layer configured DMRS configuration. However, if the UE is configured to select the recommended DMRS configuration, the evaluation of the CSI-RS using assumptions that depend on one or more parameters of the higher layer configured DMRS configuration may result in a CSF report that is inconsistent with the recommended DMRS configuration, and which may allow the UE to achieve higher spectral efficiency for the associated channel and reception conditions. This may result in the base station using transmission parameters that do not allow the UE to take advantage of potential spectral efficiency gains that can be achieved with the recommended DMRS configuration.

[0059] As indicated above, Figure 3 are provided as examples. Other examples may differ from those described herein. Figure 3 Examples described.

[0060] In some aspects described herein, a UE may be configured to receive one or more downlink reference signals and determine a recommended DMRS configuration (e.g., a DMRS configuration recommended for use by a base station to transmit PDSCH communications and / or PDSCH allocations) based on the one or more reference signals. The UE may evaluate the one or more downlink reference signals based at least in part on a CSI reference resource definition associated with (e.g., assumed) parameters of the recommended DMRS configuration. For example, the CSI reference resource definition may reference parameters of the DMRS configuration (such as the number of frontloaded DMRS symbols, the number of additional DMRS symbols (e.g., the number of symbol positions)), the position of the DMRS symbols relative to a PDSCH allocation boundary on a time axis, an assumption about the duration of the PDSCH allocation (e.g., based at least in part on the recommended DMRS configuration, the DMRS type, the DMRS boosting configuration, etc.).

[0061] The UE may transmit an indication of a recommended DMRS, which is assumed to be used at least in part to generate a CSF report including at least one CQI based at least in part on the recommended DMRS configuration, as part of the CSF report, coupled to the CSF report, etc. The base station may use the CSF report and the indication of the recommended DMRS configuration to select transmission parameters to be used for the PDSCH (e.g., communications using the PDSCH). In this way, the UE may transmit a CSF report and an indication of a corresponding recommended DMRS configuration (e.g., assumed to be used to determine the CSF report), so that the base station may select transmission parameters (e.g., including the DMRS configuration) that may achieve the highest spectral efficiency (e.g., a balance between the number of resources carrying data and the number of pilots that assist the UE in demodulating and / or decoding data) for the associated channel and link conditions. This may save network resources that may otherwise be used to transmit an unnecessary number of pilots in some cases, or to transmit a large number of data resources with a low decoding success rate (e.g., based at least in part on an insufficient number of pilots) in other cases, etc.

[0062] Figure 4 4 is a diagram illustrating an example 400 associated with reporting a CSF and one or more related DMRS configurations according to aspects of the present disclosure. Figure 4 As shown in FIG. 1 , a UE (eg, UE 120) may communicate with a base station (eg, base station 110). The UE and the base station may be part of a wireless network (eg, wireless network 100).

[0063] As indicated by reference numeral 405, the base station may transmit, and the UE may receive, configuration information. In some aspects, the UE may receive the configuration information from another device (e.g., from another base station, another UE, etc.). In some aspects, the UE may receive the configuration information via one or more of RRC signaling, media access control (MAC) signaling (e.g., MAC control element (MAC CE)), etc. In some aspects, the configuration information may include an indication of one or more configuration parameters selected by the UE (e.g., already known by the UE), explicit configuration information for the UE to use to configure the UE, etc.

[0064] In some aspects, the configuration information may identify a set of DMRS configurations from which the UE may select a recommended DMRS configuration for the PDSCH. In some aspects, the configuration information may indicate that the UE is to select the recommended DMRS configuration based at least in part on one or more downlink reference signals (e.g., a CSI reference signal, a CSI interference measurement (CSI-IM), a tracking reference signal (TRS), or a downlink DMRS, etc.).

[0065] The configuration information may indicate one or more configuration parameters for determining a defined set of CSI reference resources. In some aspects, the defined set of CSI reference resources may refer to parameters of a recommended DMRS configuration. In some aspects, the configuration information may indicate that the UE is to use a recommended DMRS configuration for one or more of the definitions of CSI reference resources (e.g., see parameters of a recommended DMRS configuration) for evaluating one or more downlink reference resources (e.g., for generating one or more CSF reports) to determine one or more CQIs associated with one or more selected DMRS configurations / options.

[0066] The configuration information may indicate that the UE is to generate a CSF report indicating at least one CQI determined based at least in part on a set of DMRS parameters corresponding to the recommended DMRS configuration, which is used as a basis for one or more CSI reference resource definitions. The configuration information may indicate that the UE is to transmit an indication of the recommended DMRS configuration as part of the CSF report, coupled to the CSF report, with an identifier linking the indication to the CSF report, and the like.

[0067] As indicated by reference numeral 410, the UE may configure the UE for communication with the base station. In some aspects, the UE may configure the UE based at least in part on the configuration information. In some aspects, the UE may be configured to perform one or more operations described herein.

[0068] In some aspects, the UE may transmit, and the base station may receive, an indication of the UE's capabilities to determine a recommended DMRS configuration, evaluate a downlink reference signal based at least in part on the recommended DMRS configuration, generate a CSF report based at least in part on the recommended DMRS configuration, transmit the CSF report and / or an indication of the recommended DMRS configuration, etc. In some aspects, the UE may transmit the indication of the UE's capabilities via RRC signaling, one or more MAC CEs, a physical uplink control channel (PUCCH) message, etc.

[0069] As indicated by reference numeral 415, the UE may receive and the base station may transmit one or more downlink reference signals that may be used to determine downlink channel characteristics and link conditions. In some aspects, the one or more downlink reference signals may include one or more CSI-RS, CSI-IM, TRS, DMRS, system information blocks, and the like.

[0070] As indicated by reference numeral 420, the UE may select a recommended DMRS configuration based at least in part on one or more downlink reference signals. In some aspects, the UE may select a recommended DMRS configuration from a set of DMRS configurations (e.g., configured via higher layer (e.g., RRC, MAC, etc.) signaling). The UE may select the recommended DMRS configuration based at least in part on channel characteristics or reception conditions estimated based at least in part on one or more downlink reference signals. In some aspects, the recommended DMRS configuration may be selected based at least in part on the UE determining that the recommended DMRS configuration is the most appropriate DMRS configuration for channel characteristics and / or reception conditions estimated based at least in part on one or more downlink reference signals. For example, the UE may determine that the recommended DMRS configuration maximizes PDSCH spectral efficiency compared to other DMRS configurations.

[0071] As indicated by reference numeral 425, the UE may generate a CSF report based at least in part on the DMRS parameters and / or associated CSI reference resource definitions of the recommended DMRS configuration. In some aspects, the CSF report may include at least one CQI report (e.g., an indication of a CQI), an indication of a recommended RI, a PMI, etc. determined based at least in part on the recommended DMRS configuration. The CSF report may include or be coupled to an indication of a recommended DMRS configuration for determining a CQI, a recommended RI, a PMI, etc. for at least one CQI report.

[0072] In some aspects, a defined set of CSI reference resources for generating a CSF report is based at least in part on a set of DMRS parameters. For example, the defined set for CSI reference resources may include definitions and / or assumptions, such as: the number of one or more frontloaded DMRS symbols is based at least in part on a recommended DMRS configuration; the number and / or associated positions of one or more additional DMRS symbols are based at least in part on the recommended DMRS configuration; the positions of the DMRS symbols relative to the first and last symbols of a PDSCH allocation with a corresponding assumption of an allocation duration are based at least in part on the recommended DMRS configuration; the DMRS type used for the PDSCH is based at least in part on the recommended DMRS configuration, etc. In some aspects, a defined set for CSI reference resources may include definitions and / or assumptions, such as: the allocation duration for the PDSCH is based at least in part on the recommended DMRS configuration; the PDSCH includes DMRS symbols according to the recommended DMRS configuration; the DMRS boosting configuration and assumptions about multiplexing of DMRS resources and data resources on the DMRS symbols are based at least in part on the recommended DMRS configuration, etc.

[0073] In some aspects, the set of definitions for CSI reference resources may include a first subset of definitions associated with determining a transport block size, a code block segmentation, a code block length, etc. associated with determining CQI. In some aspects, the first subset of definitions may be based at least in part on a set of assumptions including that the sum of the number of PDSCH symbols and DMRS symbols is equal to 12 symbols, that the PDSCH symbols do not include DMRS, etc.

[0074] The set of definitions for CSI reference resources may also include a second subset of definitions, independent of the first subset of definitions, associated with determining one or more of a recommended RI, a PMI, a recommended DMRS configuration, and the like. In some aspects, the recommended DMRS configuration and the corresponding PDSCH allocation duration may define a code block size and / or decoding performance. The second subset of definitions may also be associated with CQI determination excluding a transport block size, a code block segmentation, a code block length, associated parameters, and the like. In some aspects, the UE may determine the CQI based at least in part on the recommended DMRS configuration that affects the estimated spectral efficiency.

[0075] In some aspects, the UE may select a recommended DMRS configuration and generate a CSF report jointly and / or iteratively. In some aspects, the UE may select a PMI and a RI and then select a recommended DMRS configuration. The UE may select a CQI based at least in part on the recommended DMRS configuration, the PMI, the RI, etc.

[0076] As indicated by reference numeral 430, the UE may generate a CQI report based at least in part on DMRS parameters and / or associated CSI reference resource definitions of a default DMRS configuration. In some aspects, the default DMRS configuration may be based at least in part on a communication standard (e.g., explicitly, based at least in part on one or more configured parameters, etc.), RRC signaling, downlink control information, one or more MAC CEs, a recommended DMRS configuration, etc. In some aspects, the UE may generate a first CQI report associated with the default DMRS configuration and a second CQI report associated with the recommended DMRS configuration. In some aspects, the first CQI report and the second CQI report may be part of a single CSF report, may be transmitted within a single uplink transmission, may be coupled for transmission, etc.

[0077] The default DMRS configuration may be associated with a set of definitions for CSI reference resources, comprising: the number of one or more frontload DMRS symbols is based at least in part on the default DMRS configuration; the number of one or more additional DMRS symbols is based at least in part on the default DMRS configuration; the position of the DMRS symbols relative to the first and / or last symbols of a PDSCH allocation (with corresponding assumptions of a default PDSCH allocation duration) is based at least in part on the default DMRS configuration; the DMRS type used for the PDSCH is based at least in part on the default DMRS configuration, and the like.

[0078] In some aspects, the default DMRS configuration can be associated with a set of definitions for CSI reference resources, which includes: the allocation duration for PDSCH is based at least in part on the default DMRS configuration; the PDSCH includes DMRS codewords according to the default DMRS configuration; the DMRS boosting configuration and assumptions about the multiplexing of DMRS resources and data resources on the DMRS codewords are based at least in part on the recommended DMRS configuration, etc.

[0079] As indicated by reference numeral 435, the UE may transmit, and the base station may receive, a CSF report, one or more CQI reports, and / or an indication of a recommended DMRS configuration. In some aspects, the CSF report may include a CQI report associated with a recommended DMRS configuration, a CQI report associated with a default DMRS configuration, an indication of a recommended DMRS configuration, etc. In some aspects, the CQI report associated with a recommended DMRS configuration, the CQI report associated with a default DMRS configuration, and / or an indication of a recommended DMRS configuration may be coupled to the CSF report, transmitted separately from the CSF report, etc.

[0080] In some aspects, the UE may report an indication of a recommended DMRS configuration based at least in part on a CSI framework. For example, the UE may report an indication of a recommended DMRS configuration based at least in part on a configuration under a CSI reporting configuration, the UE may use an intermediate result of a CSF evaluation of a reference signal to select a recommended DMRS configuration, the UE may report an indication of a recommended DMRS configuration as part of an extended CSF report or as a coupled report. In some aspects, the UE may transmit a CSF report with an indication of multiple CQI and DMRS configuration pairs.

[0081] As indicated by reference numeral 440, the base station may select one or more transmission parameters for the PDSCH based at least in part on the CSF report, one or more CQI reports, and / or an indication of a recommended DMRS configuration. In some aspects, the base station may determine whether to adopt a recommended DMRS configuration, a recommended RI, a PMI, etc. (e.g., based at least in part on scheduling restrictions, channel characteristics, Doppler conditions, etc.). In some aspects, the base station may determine to adjust one or more transmission parameters associated with the CSF report or the recommended DMRS configuration based at least in part on the CSI reference resource definition set. The base station may then transmit a PDSCH communication to the UE based at least in part on the one or more adjusted transmission parameters.

[0082] Based at least in part on the UE generating a CSF report using the recommended DMRS configuration and transmitting an indication of the recommended DMRS configuration, the base station can select transmission parameters that are likely to achieve the highest spectral efficiency (e.g., a balance between the number of resources carrying data and the number of pilots that assist the UE in demodulating and / or decoding the data). This can save network resources that might otherwise be used to transmit an unnecessary number of pilots, to transmit a large number of data resources with a low decoding success rate (e.g., based at least in part on an insufficient number of pilots), etc.

[0083] As indicated above, Figure 4 are provided as examples. Other examples may differ from those described herein. Figure 4 Examples described.

[0084] Figure 5-7 are diagrams illustrating examples 500 , 600 , 700 associated with DMRS patterns for different PDSCH allocation durations in accordance with aspects of the present disclosure.

[0085] like Figure 5 In the figure and as shown by reference numeral 505, the DMRS configuration may include two first codewords allocated to a physical downlink control channel (PDCCH), two codewords allocated for DMRS in a five-codeword interval for data of the PDSCH, and five final codewords allocated for non-PDSCH resources (e.g., physical uplink shared channel (PUSCH) resources).

[0086] As indicated by reference numeral 510, the DMRS configuration may include two first symbols allocated to the PDCCH, two symbols allocated for the DMRS at intervals at either end of six symbols allocated for data of the PDSCH, and four final symbols allocated for non-PDSCH resources.

[0087] As indicated by reference numeral 515, the DMRS configuration may include two first symbols allocated to the PDCCH, two symbols allocated for the DMRS spaced within seven symbols allocated for data of the PDSCH, and three final symbols allocated for non-PDSCH resources.

[0088] As indicated by reference numeral 520, the DMRS configuration may include two first symbols allocated to the PDCCH, two symbols allocated for the DMRS spaced within eight symbols allocated for data of the PDSCH, and two final symbols allocated for non-PDSCH resources.

[0089] As indicated by reference numeral 525, the DMRS configuration may include two first symbols allocated to the PDCCH, two symbols allocated for the DMRS spaced within nine symbols allocated for data of the PDSCH, and one final symbol allocated for non-PDSCH resources.

[0090] As indicated by reference numeral 530, the DMRS configuration may include two first symbols allocated to the PDCCH, and two symbols allocated for the DMRS spaced within ten symbols allocated for the data of the PDSCH.

[0091] As indicated by reference numeral 535, the DMRS configuration may include three first symbols allocated to the PDCCH, two symbols allocated for the DMRS spaced within four symbols allocated for data of the PDSCH, and five final symbols allocated for non-PDSCH resources.

[0092] As indicated by reference numeral 540, the DMRS configuration may include three first symbols allocated to the PDCCH, two symbols allocated for DMRS at intervals on either side of five symbols allocated for data of the PDSCH, and four final symbols allocated for non-PDSCH resources.

[0093] As indicated by reference numeral 545, the DMRS configuration may include three first symbols allocated to the PDCCH, two symbols allocated for the DMRS spaced within six symbols allocated for data of the PDSCH, and three final symbols allocated for non-PDSCH resources.

[0094] As indicated by reference numeral 550, the DMRS configuration may include three first symbols allocated to the PDCCH, two symbols allocated for the DMRS spaced within seven symbols allocated for data of the PDSCH, and two final symbols allocated for non-PDSCH resources.

[0095] As indicated by reference numeral 555, the DMRS configuration may include three first symbols allocated to the PDCCH, two symbols allocated for the DMRS spaced within eight symbols allocated for data of the PDSCH, and one final symbol allocated for non-PDSCH resources.

[0096] As indicated by reference numeral 560, the DMRS configuration may include three first symbols allocated to the PDCCH, and two symbols allocated for the DMRS spaced within nine symbols allocated for data of the PDSCH.

[0097] like Figure 6 6 and indicated by reference numeral 605, the DMRS configuration may include two first symbols allocated to the PDCCH, three symbols allocated for the DMRS spaced within five symbols allocated for data of the PDSCH, and four final symbols allocated for non-PDSCH resources.

[0098] As indicated by reference numeral 610, the DMRS configuration may include two first symbols allocated to the PDCCH, three symbols allocated for the DMRS spaced within six symbols allocated for data of the PDSCH, and three final symbols allocated for non-PDSCH resources.

[0099] As indicated by reference numeral 615, the DMRS configuration may include two first symbols allocated to the PDCCH, three symbols allocated for the DMRS spaced within seven symbols allocated for data of the PDSCH, and two final symbols allocated for non-PDSCH resources.

[0100] As indicated by reference numeral 620, the DMRS configuration may include two first symbols allocated to the PDCCH, three symbols allocated for the DMRS spaced within eight symbols allocated for data of the PDSCH, and one final symbol allocated for non-PDSCH resources.

[0101] As indicated by reference numeral 625, the DMRS configuration may include two first symbols allocated to the PDCCH, and three symbols allocated for the DMRS spaced within nine symbols allocated for data of the PDSCH.

[0102] As indicated by reference numeral 630, the DMRS configuration may include three first symbols allocated to the PDCCH, three symbols allocated for the DMRS spaced within four symbols allocated for data of the PDSCH, and four final symbols allocated for non-PDSCH resources.

[0103] As indicated by reference numeral 635, the DMRS configuration may include three first symbols allocated to the PDCCH, three symbols allocated for the DMRS spaced within five symbols allocated for data of the PDSCH, and three final symbols allocated for non-PDSCH resources.

[0104] As indicated by reference numeral 640, the DMRS configuration may include three first symbols allocated to the PDCCH, three symbols allocated for the DMRS spaced within six symbols allocated for data of the PDSCH, and two final symbols allocated for non-PDSCH resources.

[0105] As indicated by reference numeral 645, the DMRS configuration may include three first symbols allocated to the PDCCH, three symbols allocated for the DMRS spaced within seven symbols allocated for data of the PDSCH, and one final symbol allocated for non-PDSCH resources.

[0106] As indicated by reference numeral 650, the DMRS configuration may include three first symbols allocated to the PDCCH, and three symbols allocated for the DMRS spaced within eight symbols allocated for data of the PDSCH.

[0107] In some aspects, a DMRS symbol position may be associated with (e.g., coupled to) a corresponding PDSCH allocation duration, a PDSCH mapping type, etc. In some aspects, different options for DMRS symbol positions with different PDSCH allocation durations may introduce different channel estimation error floors for different channel scenarios. Based at least in part on having different channel estimation error floors, one or more (e.g., each) of the candidate DMRS configurations with associated DMRS symbol positions (e.g., relative to the start and / or end of a PDSCH allocation) may be addressed separately and / or with a corresponding PDSCH duration assumption in the context of DMRS adaptation. In some aspects, this may allow a UE to provide a CSF report consistent with a recommended DMRS configuration, which may be used directly or by adjustment to configure PDSCH transmission parameters.

[0108] like Figure 7 , and as indicated by reference numeral 705, the DMRS configuration may include two first symbols allocated to the PDCCH, four symbols allocated for the DMRS spaced within six symbols allocated for data for the PDSCH, and two final symbols allocated for non-PDSCH resources (e.g., PUSCH).

[0109] As indicated by reference numeral 710, the DMRS configuration may include two first symbols allocated to the PDCCH, four symbols allocated for the DMRS spaced within seven symbols allocated for data of the PDSCH, and one final symbol allocated for non-PDSCH resources.

[0110] As indicated by reference numeral 715, the DMRS configuration may include two first symbols allocated to the PDCCH, and four symbols allocated for the DMRS spaced within eight symbols allocated for data of the PDSCH.

[0111] As indicated above, Figure 5-7 are provided as examples. Other examples may differ from those described in Figure 5-7 Examples described.

[0112] Figure 8 and 9 is a diagram illustrating an example associated with a type of DMRS according to aspects of the present disclosure.

[0113] like Figure 8 In and as indicated by reference numeral 805, a DMRS configuration of DMRS type A may include one symbol allocated for a DMRS position (eg, for each DMRS position). A receiving device may receive a DMRS having two code division multiplexing (CDM) groups, each CDM group having two DMRS ports.

[0114] As shown by reference numeral 810, a DMRS configuration of DMRS type A may include two symbols allocated for a DMRS position. A receiving device may receive a DMRS with two CDM groups, each with four DMRS ports. In this way, the UE may multiplex up to eight DMRS ports per DMRS position.

[0115] like Fig. 9 In FIG. 1 and as indicated by reference numeral 905, a DMRS configuration of DMRS type B may include one symbol allocated for a DMRS position. A receiving device may receive a DMRS having three CDM groups, each CDM group having two DMRS ports.

[0116] As shown by reference numeral 910, a DMRS configuration of DMRS type B may include two symbols allocated per DMRS position. A receiving device may receive a DMRS having three CDM groups, each having four DMRS ports. In this way, the UE may multiplex up to twelve DMRS ports per DMRS position.

[0117] In some aspects, different DMRS types allow different DMRS densities on the frequency axis for different channel estimation processing gains (e.g., for highly frequency selective channels). Different DMRS types can allow different maximum numbers of multiplexed DMRS ports and correspondingly allow different maximum numbers of co-scheduled UEs for MU-MIMO scenarios. In this way, the UE can select a DMRS configuration type that corresponds to the amount of desired channel estimation processing gain. In some aspects, the base station can deviate from the recommended DMRS configuration based at least in part on considerations related to MU-MIMO co-scheduling for communications within the wireless network.

[0118] As indicated above, Figure 8 and 9 are provided as examples. Other examples may differ from those described in Figure 8 and 9 The content described.

[0119] In some aspects, each port may have a differential orthogonal cover code pattern (eg, indicated by a "+" or "-" in the resources to be received by the separate port).

[0120] Fig.10 is a diagram illustrating an example process 1000, performed, for example, by a UE, in accordance with various aspects of the present disclosure. Example process 1000 is an example in which a UE (eg, UE 120, etc.) performs operations associated with reporting CSFs and related DMRS configurations.

[0121] like Fig.10 As shown in , in some aspects, process 1000 may include selecting a recommended DMRS configuration for PDSCH from a set of DMRS configurations, the recommended DMRS configuration being associated with a set of DMRS parameters (block 1010). For example, a UE (e.g., using receive processor 258, controller / processor 280, memory 282, etc.) may select a recommended DMRS configuration for PDSCH from a set of DMRS configurations, the recommended DMRS configuration being associated with a set of DMRS parameters, as described above.

[0122] As in Fig.10 As further shown in FIG. 1 , in some aspects, process 1000 may include transmitting an indication of the recommended DMRS configuration (block 1020). For example, the UE (e.g., using transmit processor 264, controller / processor 280, memory 282, etc.) may transmit an indication of the recommended DMRS configuration, as described above.

[0123] Process 1000 may include additional aspects, such as any single aspect or any combination of aspects described below and / or in conjunction with one or more other processes described elsewhere herein.

[0124] In a first aspect, transmitting the indication of the recommended DMRS configuration includes transmitting the indication of the recommended DMRS configuration as part of a CSF report or transmitting the indication of the recommended DMRS configuration coupled to the CSF report.

[0125] In a second aspect, alone or in combination with the first aspect, process 1000 includes generating a CSF report based at least in part on the set of DMRS parameters corresponding to the recommended DMRS configuration, and transmitting the CSF report.

[0126] In a third aspect, alone or in combination with one or more of the first and second aspects, the CSF report indicates one or more of a CQI, a recommended RI, or a PMI determined at least in part based on the recommended DMRS configuration.

[0127] In a fourth aspect, either alone or in combination with one or more of the first to third aspects, selecting the recommended DMRS configuration includes selecting the recommended DMRS configuration based at least in part on one or more of channel characteristics or reception conditions estimated at least in part based on one or more downlink reference signals.

[0128] In a fifth aspect, either alone or in combination with one or more of the first to fourth aspects, the one or more downlink reference signals include one or more of a CSI reference signal, a CSI interference measurement, a TRS or a DMRS.

[0129] In a sixth aspect, alone or in combination with one or more of the first to fifth aspects, a defined set of CSI reference resources for generating a CSF report is based at least in part on the set of DMRS parameters.

[0130] In a seventh aspect, either alone or in combination with one or more of the first to sixth aspects, the defined set for the CSI reference resource includes one or more of the following: the number of one or more frontload DMRS symbols is based at least in part on the recommended DMRS configuration; the number of one or more additional DMRS symbols is based at least in part on the recommended DMRS configuration; the position of the DMRS symbol relative to the first symbol allocated for the PDSCH is based at least in part on the recommended DMRS configuration; or the DMRS type used for the PDSCH is based at least in part on the recommended DMRS configuration.

[0131] In an eighth aspect, either alone or in combination with one or more of the first to seventh aspects, the defined set for the CSI reference resources comprises one or more of the following: the allocation duration for the PDSCH is based at least in part on the recommended DMRS configuration; the PDSCH includes DMRS symbols according to the recommended DMRS configuration; or the DMRS boosting configuration and assumptions about multiplexing of DMRS resources and data resources on DMRS symbols are based at least in part on the recommended DMRS configuration.

[0132] In a ninth aspect, either alone or in combination with one or more of the first to eighth aspects, the set of definitions for the CSI reference resource comprises a first subset of definitions associated with determining one or more of: a transport block size, a code block segmentation, or a code block length associated with determining a channel quality indication; and a second subset of definitions, independent of the first subset of definitions, associated with determining one or more of: a recommended RI, a PMI, the recommended DMRS configuration, or a CQI.

[0133] In the tenth aspect, either alone or in combination with one or more of the first to ninth aspects, the first defined subset is based at least in part on a set of assumptions including one or more of the following: the sum of the number of PDSCH symbols and DMRS symbols is equal to 12 symbols, or the PDSCH symbols do not include DMRS.

[0134] In an eleventh aspect, either alone or in combination with one or more of the first to tenth aspects, process 1000 includes transmitting a CQI report comprising at least one of a first CQI determined at least in part based on the recommended DMRS configuration and a second CQI determined at least in part based on a default DMRS configuration.

[0135] In the twelfth aspect, either alone or in combination with one or more of the first to eleventh aspects, the default DMRS configuration is associated with a defined set of CSI reference resources comprising one or more of the following: the number of one or more frontload DMRS symbols is based at least in part on the default DMRS configuration; the number of one or more additional DMRS symbols is based at least in part on the default DMRS configuration; the position of the DMRS symbol relative to the first symbol allocated by the PDSCH is based at least in part on the default DMRS configuration; or the DMRS type used for the PDSCH is based at least in part on the default DMRS configuration.

[0136] In the thirteenth aspect, alone or in combination with one or more of the first to twelfth aspects, the default DMRS configuration is associated with a defined set of CSI reference resources including one or more of the following: the allocation duration for the PDSCH is based at least in part on the default DMRS configuration; the PDSCH includes DMRS codewords according to the default DMRS configuration; or the DMRS boosting configuration and assumptions about the multiplexing of DMRS resources and data resources on the DMRS codewords are based at least in part on the default DMRS configuration.

[0137] although Fig.10 An example block diagram of process 1000 is shown, but in some aspects, process 1000 may include Fig.10 Additional blocks, fewer blocks, different blocks, or differently arranged blocks than those depicted in the process 1000. Additionally or alternatively, two or more blocks of the process 1000 may be executed in parallel.

[0138] Fig.11 is a diagram illustrating an example process 1100, performed, for example, by a base station, in accordance with various aspects of the present disclosure. Example process 1100 is an example of a base station (eg, base station 110, etc.) performing operations associated with reporting CSFs and related DMRS configurations.

[0139] like Fig.11 As shown in , in some aspects, process 1100 may include receiving a CSF report and an indication of a recommended DMRS configuration associated with one or more parameters used by the UE to generate the CSF report (block 1110). For example, the base station (e.g., using receive processor 238, controller / processor 240, memory 242, etc.) may receive a CSF report and an indication of a recommended DMRS configuration associated with one or more parameters used by the UE to generate the CSF report, as described above.

[0140] like Fig.11 As further shown in FIG. 1 , in some aspects, process 1100 may include selecting transmission parameters including a DMRS configuration to be used for the PDSCH based at least in part on the CSF report and the recommended DMRS configuration (block 1120). For example, the base station (e.g., using transmit processor 220, receive processor 238, controller / processor 240, memory 242, etc.) may select transmission parameters including a DMRS configuration to be used for the PDSCH based at least in part on the CSF report and the recommended DMRS configuration, as described above.

[0141] Process 1100 may include additional aspects, such as any single aspect or any combination of aspects described below and / or in conjunction with one or more other processes described elsewhere herein.

[0142] In a first aspect, process 1100 includes determining whether to use a recommended DMRS configuration based at least in part on one or more scheduling constraints.

[0143] In a second aspect, alone or in combination with the first aspect, process 1100 includes adjusting one or more transmission parameters associated with the CSF report or the recommended DMRS configuration based at least in part on a set of CSI reference resource definitions.

[0144] In a third aspect, either alone or in combination with one or more of the first and second aspects, receiving the indication of the recommended DMRS configuration comprises receiving the indication of the recommended DMRS configuration as part of the CSF report, or receiving the indication of the recommended DMRS configuration coupled to the CSF report.

[0145] In a fourth aspect, alone or in combination with one or more of the first to third aspects, the CSF report indicates a CQI determined based at least in part on the recommended DMRS configuration.

[0146] In a fifth aspect, alone or in combination with one or more of the first to fourth aspects, a defined set of CSI reference resources used by the UE to generate the CSF report is based at least in part on one or more DMRS parameters.

[0147] In a sixth aspect, either alone or in combination with one or more of the first to fifth aspects, the defined set for the CSI reference resource includes one or more of the following: the number of one or more frontload DMRS symbols is based at least in part on the recommended DMRS configuration; the number of one or more additional DMRS symbols is based at least in part on the recommended DMRS configuration; the position of the DMRS symbol relative to the first symbol allocated for the PDSCH is based at least in part on the recommended DMRS configuration; or the DMRS type used for the PDSCH is based at least in part on the recommended DMRS configuration.

[0148] In the seventh aspect, alone or in combination with one or more of the first to sixth aspects, the defined set for the CSI reference resources includes one or more of the following: the allocation duration for the PDSCH is based at least in part on the recommended DMRS configuration; the PDSCH includes DMRS codewords according to the recommended DMRS configuration; or the DMRS boosting configuration and the assumptions about the multiplexing of DMRS resources and data resources on the DMRS codewords are based at least in part on the recommended DMRS configuration.

[0149] In an eighth aspect, either alone or in combination with one or more of the first to seventh aspects, the set of definitions for the CSI reference resource comprises a first subset of definitions associated with determining one or more of: a transport block size, a code block segmentation, or a code block length associated with determining a channel quality indication; and a second subset of definitions, independent of the first subset of definitions, associated with determining one or more of: a recommended RI, a PMI, the recommended DMRS configuration, or a CQI.

[0150] In a ninth aspect, either alone or in combination with one or more of the first to eighth aspects, the first defined subset is based at least in part on a set of assumptions including one or more of the following: the sum of the number of PDSCH symbols and DMRS symbols is equal to 12 symbols, or the PDSCH symbols do not include DMRS.

[0151] In a tenth aspect, either alone or in combination with one or more of the first to ninth aspects, process 1100 includes receiving a CQI report comprising at least one of a first CQI determined at least in part based on the recommended DMRS configuration and a second CQI determined at least in part based on a default DMRS configuration.

[0152] In the eleventh aspect, either alone or in combination with one or more of the first to tenth aspects, the default DMRS configuration is associated with a defined set of CSI reference resources comprising one or more of the following: the number of one or more frontload DMRS symbols is based at least in part on the default DMRS configuration; the number of one or more additional DMRS symbols is based at least in part on the default DMRS configuration; the position of the DMRS symbol relative to the first symbol allocated to the PDSCH is based at least in part on the default DMRS configuration; or the DMRS type used for the PDSCH is based at least in part on the default DMRS configuration.

[0153] In the twelfth aspect, either alone or in combination with one or more of the first to eleventh aspects, the default DMRS configuration is associated with a defined set of CSI reference resources comprising one or more of the following: an allocation duration for the PDSCH is based at least in part on the default DMRS configuration; the PDSCH comprises DMRS symbols according to the default DMRS configuration; or the DMRS boosting configuration and assumptions regarding multiplexing of DMRS resources and data resources on DMRS symbols are based at least in part on the default recommended DMRS configuration.

[0154] In a thirteenth aspect, alone or in combination with one or more of the first to twelfth aspects, process 1100 includes transmitting an indication of the DMRS configuration to the UE; and transmitting the PDSCH based at least in part on the DMRS configuration to the UE.

[0155] although Fig.11 An example block diagram of process 1100 is shown, but in some aspects, process 1100 may include Fig.11 Additional blocks, fewer blocks, different blocks, or differently arranged blocks than those depicted in the process 1100. Additionally or alternatively, two or more blocks of the process 1100 may be executed in parallel.

[0156] The foregoing disclosure provides illustration and description, but is not intended to be exhaustive or to limit the aspects to the precise forms disclosed. Modifications and variations may be made in light of the above disclosure or may be acquired by practice of the various aspects.

[0157] As used herein, the term "component" is intended to be broadly interpreted as a combination of hardware, firmware, and / or hardware and software. As used herein, a processor is implemented with a combination of hardware, firmware, and / or hardware and software. It will be apparent that the system and / or method described herein can be implemented in different forms of hardware, firmware, and / or a combination of hardware and software. The actual dedicated control hardware or software code used to implement these systems and / or methods does not limit various aspects. Thus, the operation and behavior of these systems and / or methods are described herein without reference to specific software codes--it is understood that software and hardware can be designed to implement these systems and / or methods based at least in part on the description herein.

[0158] As used herein, satisfying a threshold may refer to a value being greater than a threshold, greater than or equal to a threshold, less than a threshold, less than or equal to a threshold, equal to a threshold, not equal to a threshold, etc., depending on the context.

[0159] Although specific feature combinations are described in the claims and / or disclosed in the specification, these combinations are not intended to limit the disclosure of various aspects. In fact, many of these features can be combined in a manner not specifically described in the claims and / or not disclosed in the specification. Although each dependent claim listed below can be directly subordinate to only one claim, the disclosure of various aspects includes that each dependent claim is combined with each other claim in this group of claims. The phrase quoting "at least one of" a column of items refers to any combination of these items, including a single member. As an example, "at least one of a, b or c" is intended to cover: a, b, c, ab, ac, bc, and abc, and any combination with multiple identical elements (for example, aa, aaa, aab, aac, abb, acc, bb, bbb, bbc, cc, and ccc, or any other sorting of a, b and c).

[0160] Elements, actions or instructions used herein should not be interpreted as key or necessary unless explicitly described as such. Moreover, as used herein, the articles "one" and "a" are intended to include one or more items, and can be used interchangeably with "one or more". In addition, as used herein, the article "the" is intended to include one or more items quoted in conjunction with the article "the", and can be used interchangeably with "one or more". In addition, as used herein, the terms "set" and "group" are intended to include one or more items (e.g., related items, non-related items, combinations of related and non-related items, etc.), and can be used interchangeably with "one or more". In the case of intending to have only one item, the phrase "only one" or similar language is used. Moreover, as used herein, the terms "having", "containing", "including", etc. are intended to be open terms. In addition, the phrase "based on" is intended to mean "based at least in part on", unless otherwise explicitly stated. Furthermore, as used herein, the term "or" when used in a sequence is intended to be inclusive and may be used interchangeably with "and / or" unless explicitly stated otherwise (e.g., when used in conjunction with "either of" or "only one of").

Claims

1. A wireless communication method performed by a user equipment UE, comprising: and selecting a recommended DMRS configuration for a physical downlink shared channel (PDSCH) from a set of demodulation reference signal (DMRS) configurations, the recommended DMRS configuration being associated with a set of DMRS parameters, wherein a defined set of channel state information reference resources for generating a channel state feedback report is based at least in part on the set of DMRS parameters, and wherein the defined set of channel state information reference resources comprises one or more of: The number of the one or more frontloaded DMRS symbols is based at least in part on the recommended DMRS configuration; The number of the one or more additional DMRS symbols is based at least in part on the recommended DMRS configuration; The position of the DMRS symbol relative to one or more of the first or last symbol of the physical downlink shared channel allocation is based at least in part on the recommended DMRS configuration, or The DMRS type for the PDSCH is based at least in part on the recommended DMRS configuration; and An indication of the recommended DMRS configuration is transmitted.

2. The method of claim 1 , wherein transmitting the indication of the recommended DMRS configuration comprises: transmitting said indication of said recommended DMRS configuration as part of a channel state feedback (CSF) report; or The indication of the recommended DMRS configuration is transmitted coupled to the CSF report.

3. The method of claim 1, further comprising: generating a CSF report based at least in part on the set of DMRS parameters corresponding to the recommended DMRS configuration; as well as The CSF report is transmitted.

4. The method of claim 3, wherein the CSF report indicates one or more of a channel quality indicator, a recommended rank indicator, or a precoding matrix indicator determined at least in part based on the recommended DMRS configuration.

5. The method of claim 1 , wherein selecting the recommended DMRS configuration comprises: The recommended DMRS configuration is selected based at least in part on one or more of estimated channel characteristics or reception conditions of one or more downlink reference signals.

6. The method of claim 5, wherein the one or more downlink reference signals include one or more of a channel state information (CSI) reference signal, a CSI interference measurement, a tracking reference signal, or a DMRS.

7. The method of claim 1 , wherein the defined set of channel state information reference resources comprises one or more of: An allocation duration for a physical downlink shared channel is based at least in part on the recommended DMRS configuration; A physical downlink shared channel includes DMRS symbols configured according to the recommended DMRS, or The DMRS boosting configuration and assumptions regarding multiplexing of DMRS resources and data resources on DMRS symbols are based at least in part on the recommended DMRS configuration.

8. The method of claim 1, wherein the defined set of channel state information reference resources comprises: a first defined subset associated with determining one or more of a transport block size, a code block segmentation, or a code block length in association with determining a channel quality indication; as well as A second defined subset, independent of the first defined subset, is associated with determining one or more of a recommended rank indicator, a precoding matrix indicator, the recommended DMRS configuration, or a channel quality indicator.

9. The method of claim 8, wherein the first defined subset is based at least in part on a set of assumptions including one or more of: The sum of the number of physical downlink shared channel PDSCH symbols and DMRS symbols is equal to 12 symbols, or The PDSCH symbol does not include DMRS.

10. The method of claim 1, further comprising: Transmitting a channel quality indicator (CQI) report including at least one of: a first CQI determined based at least in part on the recommended DMRS configuration, and A second CQI is determined based at least in part on the default DMRS configuration.

11. The method of claim 10, wherein the default DMRS configuration is associated with a defined set of channel state information reference resources comprising one or more of: The number of the one or more frontloaded DMRS symbols is based at least in part on the default DMRS configuration; The number of the one or more additional DMRS symbols is based at least in part on the default DMRS configuration; The position of the DMRS symbol relative to one or more of the first or last symbol of the physical downlink shared channel allocation is based at least in part on the default DMRS configuration, or The DMRS type used for the PDSCH is based at least in part on the default DMRS configuration.

12. The method of claim 10, wherein the default DMRS configuration is associated with a defined set of channel state information reference resources comprising one or more of: An allocated duration for a physical downlink shared channel is based at least in part on the default DMRS configuration; A physical downlink shared channel includes DMRS symbols according to the default DMRS configuration, or The DMRS boosting configuration and assumptions regarding multiplexing of DMRS resources and data resources on DMRS symbols are based at least in part on the recommended DMRS configuration.

13. A wireless communication method performed by a network node, comprising: receiving a channel state feedback, CSF, report and an indication of a recommended DMRS configuration associated with one or more parameters used by a user equipment, UE, to generate the CSF report; as well as selecting transmission parameters including a DMRS configuration to be used for a physical downlink shared channel (PDSCH) based at least in part on the CSF report and the recommended DMRS configuration, wherein a defined set of channel state information reference resources used by the UE to generate the CSF report is based at least in part on one or more DMRS parameters, and wherein the defined set of channel state information reference resources comprises one or more of: The number of the one or more frontloaded DMRS symbols is based at least in part on the recommended DMRS configuration; The number of the one or more additional DMRS symbols is based at least in part on the recommended DMRS configuration; The position of the DMRS symbol relative to one or more of the first or last symbol of the physical downlink shared channel allocation is based at least in part on the recommended DMRS configuration, or The DMRS type used for the PDSCH is based at least in part on the recommended DMRS configuration.

14. The method of claim 13, further comprising: A determination is made whether to use the recommended DMRS configuration based at least in part on one or more scheduling constraints.

15. The method of claim 13, further comprising: One or more transmission parameters associated with the CSF report or the recommended DMRS configuration are adjusted based at least in part on a set of CSI reference resource definitions.

16. The method of claim 13, wherein receiving the indication of the recommended DMRS configuration comprises: receiving said indication of said recommended DMRS configuration as part of said CSF report, or The indication of the recommended DMRS configuration is received coupled to the CSF report.

17. The method of claim 13, wherein the CSF report indicates a channel quality indicator determined based at least in part on the recommended DMRS configuration.

18. The method of claim 13, wherein the defined set of channel state information reference resources comprises one or more of: An allocation duration for a physical downlink shared channel is based at least in part on the recommended DMRS configuration; A physical downlink shared channel includes DMRS symbols configured according to the recommended DMRS, or The DMRS boosting configuration and assumptions regarding multiplexing of DMRS resources and data resources on DMRS symbols are based at least in part on the recommended DMRS configuration.

19. The method of claim 13, wherein the defined set of channel state information reference resources comprises: a first defined subset associated with determining one or more of a transport block size, a code block segmentation, or a code block length in association with determining a channel quality indication; as well as A second defined subset, independent of the first defined subset, is associated with determining one or more of a recommended rank indicator, a precoding matrix indicator, the recommended DMRS configuration, or a channel quality indicator.

20. The method of claim 19, wherein the first defined subset is based at least in part on a set of assumptions including one or more of: The sum of the number of physical downlink shared channel PDSCH symbols and DMRS symbols is equal to 12 symbols, or The PDSCH symbol does not include DMRS.

21. The method of claim 13, further comprising: Receiving a channel quality indicator report comprising at least one of: a first CQI determined based at least in part on the recommended DMRS configuration, and A second CQI is determined based at least in part on the default DMRS configuration.

22. The method of claim 21, wherein the default DMRS configuration is associated with the defined set for the channel state information reference resources comprising one or more of: The number of the one or more frontloaded DMRS symbols is based at least in part on the default DMRS configuration; The number of the one or more additional DMRS symbols is based at least in part on the default DMRS configuration; The position of the DMRS symbol relative to one or more of the first or last symbol of the physical downlink shared channel allocation is based at least in part on the default DMRS configuration, or The DMRS type used for the PDSCH is based at least in part on the default DMRS configuration.

23. The method of claim 21, wherein the default DMRS configuration is associated with a defined set of channel state information reference resources comprising one or more of: An allocated duration for a physical downlink shared channel is based at least in part on the default DMRS configuration; A physical downlink shared channel includes DMRS symbols according to the default DMRS configuration, or The DMRS boosting configuration and assumptions regarding multiplexing of DMRS resources and data resources on DMRS symbols are based at least in part on the default DMRS configuration.

24. The method of claim 13, further comprising: transmitting an indication of the DMRS configuration to the UE; as well as The PDSCH based at least in part on the DMRS configuration is transmitted to the UE.

25. A non-transitory computer-readable medium storing an instruction set for wireless communication, the instruction set comprising: One or more instructions, which, when executed by one or more processors of a user equipment UE, cause the UE to: and selecting a recommended DMRS configuration for a physical downlink shared channel (PDSCH) from a set of demodulation reference signal (DMRS) configurations, the recommended DMRS configuration being associated with a set of DMRS parameters, wherein a defined set of channel state information reference resources for generating a channel state feedback report is based at least in part on the set of DMRS parameters, and wherein the defined set of channel state information reference resources comprises one or more of: The number of the one or more frontloaded DMRS symbols is based at least in part on the recommended DMRS configuration; The number of the one or more additional DMRS symbols is based at least in part on the recommended DMRS configuration; The position of the DMRS symbol relative to one or more of the first or last symbol of the physical downlink shared channel allocation is based at least in part on the recommended DMRS configuration, or The DMRS type for the PDSCH is based at least in part on the recommended DMRS configuration; and An indication of the recommended DMRS configuration is transmitted.

26. A non-transitory computer-readable medium storing an instruction set for wireless communication, the instruction set comprising: One or more instructions which, when executed by one or more processors of a network node, cause the network node to: receiving a channel state feedback, CSF, report and an indication of a recommended DMRS configuration associated with one or more parameters used by a user equipment, UE, to generate the CSF report; and selecting transmission parameters including a DMRS configuration to be used for a physical downlink shared channel (PDSCH) based at least in part on the CSF report and the recommended DMRS configuration, wherein a defined set of channel state information reference resources used by the UE to generate the CSF report is based at least in part on one or more DMRS parameters, and wherein the defined set of channel state information reference resources comprises one or more of: The number of the one or more frontloaded DMRS symbols is based at least in part on the recommended DMRS configuration; The number of the one or more additional DMRS symbols is based at least in part on the recommended DMRS configuration; The position of the DMRS symbol relative to one or more of the first or last symbol of the physical downlink shared channel allocation is based at least in part on the recommended DMRS configuration, or The DMRS type used for the PDSCH is based at least in part on the recommended DMRS configuration.

27. A user equipment UE for wireless communication, comprising: Memory; as well as one or more processors operatively coupled to the memory, the memory and the one or more processors being configured to: and selecting a recommended DMRS configuration for a physical downlink shared channel (PDSCH) from a set of demodulation reference signal (DMRS) configurations, the recommended DMRS configuration being associated with a set of DMRS parameters, wherein a defined set of channel state information reference resources for generating a channel state feedback report is based at least in part on the set of DMRS parameters, and wherein the defined set of channel state information reference resources comprises one or more of: The number of the one or more frontloaded DMRS symbols is based at least in part on the recommended DMRS configuration; The number of the one or more additional DMRS symbols is based at least in part on the recommended DMRS configuration; The position of the DMRS symbol relative to one or more of the first or last symbol of the physical downlink shared channel allocation is based at least in part on the recommended DMRS configuration, or The DMRS type for the PDSCH is based at least in part on the recommended DMRS configuration; and An indication of the recommended DMRS configuration is transmitted.

28. A network node for wireless communication, comprising: Memory; as well as one or more processors operatively coupled to the memory, the memory and the one or more processors being configured to: receiving a channel state feedback, CSF, report and an indication of a recommended DMRS configuration associated with one or more parameters used by a user equipment, UE, to generate the CSF report; and selecting transmission parameters including a DMRS configuration to be used for a physical downlink shared channel (PDSCH) based at least in part on the CSF report and the recommended DMRS configuration, wherein a defined set of channel state information reference resources used by the UE to generate the CSF report is based at least in part on one or more DMRS parameters, and wherein the defined set of channel state information reference resources comprises one or more of: The number of the one or more frontloaded DMRS symbols is based at least in part on the recommended DMRS configuration; The number of the one or more additional DMRS symbols is based at least in part on the recommended DMRS configuration; The position of the DMRS symbol relative to one or more of the first or last symbol of the physical downlink shared channel allocation is based at least in part on the recommended DMRS configuration, or The DMRS type used for the PDSCH is based at least in part on the recommended DMRS configuration.

29. A device for wireless communication, comprising: Means for selecting a recommended DMRS configuration for a physical downlink shared channel (PDSCH) from a set of demodulation reference signal (DMRS) configurations, the recommended DMRS configuration being associated with a set of DMRS parameters, wherein a defined set of channel state information reference resources for generating a channel state feedback report is based at least in part on the set of DMRS parameters, and wherein the defined set of channel state information reference resources comprises one or more of: The number of the one or more frontloaded DMRS symbols is based at least in part on the recommended DMRS configuration; The number of the one or more additional DMRS symbols is based at least in part on the recommended DMRS configuration; The position of the DMRS symbol relative to one or more of the first or last symbol of the physical downlink shared channel allocation is based at least in part on the recommended DMRS configuration, or A DMRS type for the PDSCH is based at least in part on the recommended DMRS configuration; as well as Means for transmitting an indication of the recommended DMRS configuration.

30. The apparatus of claim 29, wherein the apparatus further comprises means for performing the method of any one of claims 2-12.

31. A device for wireless communication, comprising: means for receiving a channel state feedback, CSF, report and an indication of a recommended DMRS configuration associated with one or more parameters used by a user equipment, UE, to generate said CSF report; as well as Means for selecting transmission parameters including a DMRS configuration to be used for a physical downlink shared channel (PDSCH) based at least in part on the CSF report and the recommended DMRS configuration, wherein a defined set of channel state information reference resources used by the UE to generate the CSF report is based at least in part on one or more DMRS parameters, and wherein the defined set of channel state information reference resources comprises one or more of: The number of the one or more frontloaded DMRS symbols is based at least in part on the recommended DMRS configuration; The number of the one or more additional DMRS symbols is based at least in part on the recommended DMRS configuration; The position of the DMRS symbol relative to one or more of the first or last symbol of the physical downlink shared channel allocation is based at least in part on the recommended DMRS configuration, or The DMRS type used for the PDSCH is based at least in part on the recommended DMRS configuration.

32. The apparatus of claim 31, wherein the apparatus further comprises means for performing the method of any one of claims 14-24.

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