Demodulation reference signal time domain bundling

Abstract

Various aspects of the present disclosure generally relate to wireless communications. In some aspects, a user equipment (UE) may receive information from a base station indicating that demodulation reference signal (DMRS) time domain bundling is enabled. The UE may determine a time domain bundling configuration based at least in part on the information indicating that DMRS time domain bundling is enabled. Accordingly, in some aspects, the UE may perform channel estimation based at least in part on the DMRS received in different physical downlink control channel monitoring opportunities based at least in part on the time domain bundling configuration. Numerous other aspects are provided.

Description

[0001] Public domain

[0002] Aspects of the present disclosure relate generally to wireless communications and to techniques and apparatus for demodulation reference signal (DMRS) time domain bundling.

[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 communication network may include several base stations (BS) 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, a gNB, an Access Point (AP), a Radio Head, a Transmit Receive Point (TRP), a New Radio (NR) BS, a 5G Node B, and the like.

[0006] The above multiple access technologies have been adopted in various telecommunication standards to provide common protocols that enable 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. However, as the demand for mobile broadband access continues to grow, there is a need for further improvements in LTE and NR technologies. Preferably, these improvements should be applicable to other multiple access technologies and telecommunication standards that adopt these technologies.

[0007] Overview

[0008] In some aspects, a wireless communication method performed by a user equipment (UE) may include: receiving information from a base station indicating that demodulation reference signal (DMRS) time domain bundling is enabled; determining a time domain bundling configuration based at least in part on the information indicating that DMRS time domain bundling is enabled; and performing channel estimation based at least in part on the time domain bundling configuration and at least in part on the DMRS received in different physical downlink control channel (PDCCH) monitoring opportunities.

[0009] In some aspects, a UE for wireless communication may include a memory and one or more processors operatively coupled to the memory. The memory and the one or more processors may be configured to: receive information indicating that DMRS time domain bundling is enabled from a base station; determine a time domain bundling configuration based at least in part on the information indicating that DMRS time domain bundling is enabled; and perform channel estimation based at least in part on the DMRS received in different PDCCH monitoring opportunities based at least in part on the time domain bundling configuration.

[0010] In some aspects, a non-transitory computer-readable medium may store one or more instructions for wireless communication. The one or more instructions, when executed by one or more processors of a UE, may cause the one or more processors to: receive information indicating that DMRS time domain bundling is enabled from a base station; determine a time domain bundling configuration based at least in part on the information indicating that DMRS time domain bundling is enabled; and perform channel estimation based at least in part on the DMRS received in different PDCCH monitoring opportunities based at least in part on the time domain bundling configuration.

[0011] In some aspects, an apparatus for wireless communication may include: a device for receiving information indicating that DMRS time domain bundling is enabled from a base station; a device for determining a time domain bundling configuration based at least in part on the information indicating that DMRS time domain bundling is enabled; and a device for performing channel estimation based at least in part on the time domain bundling configuration and at least in part on DMRS received in different PDCCH monitoring opportunities.

[0012] 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.

[0013] 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

[0015] 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.

[0016] Figure 1 is a block diagram conceptually illustrating an example of a wireless communication network in accordance with various aspects of the present disclosure.

[0017] Figure 2 is a block diagram conceptually illustrating an example of a base station and a UE in communication in a wireless communication network according to various aspects of the present disclosure.

[0018] Figure 3A-3H is a diagram illustrating one or more examples of time-domain bundling of demodulation reference signals according to various aspects of the present disclosure.

[0019] Figure 4 is a diagram illustrating example processes performed, for example, by a UE according to various aspects of the present disclosure.

[0020] Detailed Description

[0021] 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 herein, 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 implemented independently or 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.

[0022] 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.

[0023] It should be noted that although various aspects may be described herein using terminology typically associated with 3G and / or 4G wireless technologies, various aspects of the present disclosure may be applied in communication systems based on other generations, such as 5G and later generations, including NR technologies.

[0024] Figure 11 is a diagram illustrating a wireless network 100 in which various aspects of the present disclosure may be practiced. The wireless network 100 may be an LTE network or some other wireless network, such as a 5G or NR network. The wireless network 100 may include several BSs 110 (shown as BSs 110a, BSs 110b, BSs 110c, and BSs 110d) and other network entities. A BS is an entity that communicates with a user equipment (UE) and may also be referred to as a base station, NRBS, B node, gNB, 5G B node (NB), access point, transmit receive point (TRP), etc. Each BS may provide communication coverage for a particular geographic area. In 3GPP, the term "cell" may refer to a coverage area of ​​a BS and / or a BS subsystem serving the coverage area, depending on the context in which the term is used.

[0025] 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.

[0026] In some aspects, the cell may not necessarily be stationary, and the geographic area of ​​the cell 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.

[0027] 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.

[0028] 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).

[0029] 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.

[0030] 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, industrial manufacturing equipment, a global positioning system device, or any other suitable device configured to communicate via a wireless or wired medium.

[0031] 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), for example, via 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.

[0032] In general, any number of wireless networks may be deployed in a given geographic area. Each wireless network may support a specific radio access technology (RAT) and may operate on one or more frequencies. 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.

[0033] 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.

[0034] As indicated above, Figure 1 are provided as examples. Other examples may differ from those described in Figure 1 Examples described.

[0035] Figure 2 A block diagram of a design 200 of a base station 110 and a UE 120 is shown, which may be Figure 1One for each base station and one for each UE in the base station 110. Base station 110 may be equipped with T antennas 234a through 234t, and UE 120 may be equipped with R antennas 252a through 252r, where in general T≧1 and R≧1.

[0036] 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 each UE based at least in part on the MCS selected for the UE, and provide data symbols for all UEs. The transmit processor 220 may also process system information (e.g., for semi-static resource partitioning information (SRPI), etc.) and control information (e.g., CQI requests, grants, upper layer signaling, etc.), and provide overhead symbols and control symbols. The transmit processor 220 may also generate reference symbols for reference signals (e.g., cell-specific reference signals (CRS)) and synchronization signals (e.g., primary synchronization signals (PSS) and secondary synchronization signals (SSS)). The transmit (TX) multiple-input multiple-output (MIMO) processor 230 may perform spatial processing (e.g., precoding) on ​​data symbols, control symbols, overhead symbols, and / or reference symbols, where applicable, and may provide T output symbol streams to T modulators (MOD) 232a to 232t. Each modulator 232 may process a respective output symbol stream (e.g., for OFDM, etc.) to obtain an output sample stream. Each modulator 232 may further process (e.g., convert to analog, amplify, filter, and up-convert) the output sample stream to obtain a downlink signal. The T downlink signals from modulators 232a to 232t may be transmitted via T antennas 234a to 234t, respectively. According to various aspects described in more detail below, position coding may be used to generate synchronization signals to convey additional information.

[0037] 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 a housing.

[0038] 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, if applicable, further processed by modulators 254a through 254r (e.g., for DFT-s-OFDM, CP-OFDM, etc.), and transmitted to the base station 110. At the base station 110, uplink signals from the UE 120 as well as other UEs may be received by the antenna 234, processed by the demodulator 232, detected by the MIMO detector 236, if applicable, and further processed by the receive processor 238 to obtain decoded data and control information sent by the UE 120. The receive processor 238 may provide decoded data to a data sink 239 and decoded control information to a controller / processor 240. The base station 110 may include a communication unit 244 and communicate with the network controller 130 via the communication unit 244. The network controller 130 may include a communication unit 294, a controller / processor 290, and a memory 292.

[0039] The controller / processor 240 of the base station 110, the controller / processor 280 of the UE 120, and / or Figure 2Any other component(s) of the base station 110 may perform one or more techniques associated with demodulation reference signal (DMRS) time domain bundling, 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 Figure 4 The operations of process 400 and / or other processes as described herein. Memories 242 and 282 may store data and program codes for base station 110 and UE 120, respectively. In some aspects, memory 242 and / or memory 282 may include a non-transitory computer-readable medium storing one or more instructions for wireless communication. For example, the one or more instructions, when executed by one or more processors of base station 110 and / or UE 120, may perform or direct, for example, Figure 4 The scheduler 246 may schedule UEs for data transmission on the downlink and / or uplink.

[0040] In some aspects, UE 120 may include: a device for receiving information indicating that DMRS time domain bundling is enabled from base station 110; a device for determining a time domain bundling configuration based at least in part on the information indicating that DMRS time domain bundling is enabled; a device for performing channel estimation based at least in part on DMRS received in different physical downlink control channel (PDCCH) monitoring opportunities based at least in part on the time domain bundling configuration; and the like. In some aspects, such a device may include a device for combining Figure 2 One or more components of UE 120 are depicted, such as controller / processor 280, transmit processor 264, TX MIMO processor 266, MOD 254, antenna 252, DEMOD 254, MIMO detector 256, receive processor 258, and the like.

[0041] As indicated above, Figure 2 are provided as examples. Other examples may differ from those described in Figure 2 Examples described.

[0042] In a wireless network, a UE may perform channel estimation of one or more properties (e.g., signal quality, signal strength, etc.) of a downlink between the UE and the base station based at least in part on one or more reference signals transmitted from a base station to the UE. For example, in some aspects, the one or more reference signals may include a DMRS configured specifically for the UE, and the base station may transmit the DMRS within a scheduled resource set (e.g., time and frequency resources). Accordingly, the base station may transmit information identifying a DMRS port (which may also be referred to as an antenna port) associated with a DMRS transmission to the UE, which may specify a resource configuration for a downlink time slot in which the DMRS is transmitted. For example, the resource configuration may include information related to a digital MIMO precoder, an analog beamforming filter, a downlink transmit power, and / or other transmission parameters associated with the DMRS. In this way, the UE may use the resource configuration to identify one or more resource elements carrying the DMRS, decode the DMRS, perform channel estimation, and the like.

[0043] In addition, in some cases, the wireless network may support DMRS bundling in the time domain (e.g., across one or more symbols or time slots), which allows the UE to assume phase continuity of the DMRS over the aggregated symbols or time slots in which the bundled DMRS is transmitted. For example, when DMRS bundling is enabled or otherwise configured, the UE may perform (joint) channel estimation based at least in part on the DMRS(s) received across multiple symbols or time slots, rather than performing channel estimation separately based on the DMRS(s) received in individual symbols, consecutive symbols of the same channel in one or more time slots, etc. In this way, DMRS bundling in the time domain may allow the UE to coherently filter the bundled DMRS received in different symbols or time slots, which improves channel estimation accuracy (especially in small bandwidth and / or low mobility scenarios). Accordingly, from the UE perspective, configuring the DMRS to always bundle across different physical downlink control channel (PDCCH) monitoring opportunities may be preferred to allow the UE to achieve maximum coherent processing gain. However, networks typically restrict DMRS bundling to limited time periods. For example, the network may dynamically adjust PDCCH transmission parameters (e.g., digital precoding matrix, analog beamforming filter, downlink power, etc.) to improve performance for a specific UE, which may cause the phase continuity of the PDCCH DMRS to be disrupted between monitoring occasions.

[0044] Some aspects described herein relate to techniques and apparatus for bundling DMRS in the time domain to enable a UE to perform joint channel estimation based at least in part on the bundled DMRS received in different symbols or time slots (e.g., different PDCCH monitoring occasions) while also providing a base station with the flexibility to dynamically adjust downlink transmission parameters to improve the performance of the UE. For example, in some aspects, UE-specific PDCCH monitoring occasions may be distinguished from cell-specific monitoring occasions, and persistent bundling may be configured for a common search space (CSS) associated with a cell-specific PDCCH monitoring occasion used to schedule broadcast information transmitted to all UEs within a cell. Additionally or alternatively, a base station may be configured to define a periodic pattern for bundling, the bundling including different PDCCH monitoring occasions in which the DMRS is bundled; provide dynamic signaling to indicate whether and / or when to reset PDCCH DMRS bundling; combine PDCCH DMRS bundling configuration with PDCCH repetition configuration; jointly configure PDCCH DMRS bundling and physical downlink shared channel (PDSCH) bundling, and the like. In this way, some aspects described herein may provide various DMRS bundling configurations to balance the tradeoff between enabling the UE to perform joint channel estimation using bundled DMRS received in different monitoring occasions and also providing the network with the flexibility to reset DMRS bundling to adapt downlink transmission parameters.

[0045] Figure 3A-3H is a diagram illustrating one or more examples 300 of DMRS time domain bundling according to various aspects of the present disclosure. Figure 3A-3H As shown in , example(s) 300 include a UE (e.g., UE 120) communicating with a base station (e.g., base station 110) over a wireless network (e.g., wireless network 100). In addition, as described herein, the base station may provide information related to DMRS bundling configuration to the UE to indicate when the DMRS is bundled across different PDCCH and / or PDSCH monitoring opportunities so that the UE can assume phase continuity of the bundled DMRS. In addition, as described herein, the base station may provide information to the UE to indicate when the DMRS bundling is to be reset to allow the base station to adapt transmission parameters.

[0046] As in Figure 3AIn the embodiment and as indicated by reference numeral 310, the base station may transmit and the UE may receive information indicating that DMRS time domain bundling is enabled. In addition, in some aspects, the information indicating that DMRS time domain bundling is enabled may include a time domain bundling configuration provided in semi-static downlink signaling (such as radio resource control (RRC) signaling), dynamic downlink signaling (such as media access control (MAC) control element (MAC-CE) or downlink control information (DCI)), etc. For example, as shown below with reference to Figure 3B As further described in detail, the time domain bundling configuration may enable persistent PDCCH DMRS time domain bundling for a CSS associated with a cell-specific PDCCH monitoring opportunity used by a base station to schedule broadcast information. Additionally or alternatively, as described below with reference to Figure 3C-Figure 3F As further described in detail, the time domain bundling configuration may include a semi-static and / or dynamic time domain bundling configuration, which indicates bundling of PDCCH DMRS across different PDCCH monitoring opportunities that vary from UE to UE, whether to reset PDCCH DMRS bundling, etc. Additionally or alternatively, as described below with reference to Figure 3G-3H As described in further detail, the time domain bundling configuration may include a joint bundling configuration for PDCCH DMRS and PDSCH DMRS, a bundling relationship between PDCCH DMRS and PDSCH DMRS, and the like.

[0047] As in Figure 3AIn and further indicated by reference numeral 312, the UE may perform channel estimation for a downlink between the base station and the UE based at least in part on the DMRS received in different PDCCH monitoring opportunities. For example, as described in further detail herein, the UE may determine a time domain bundling configuration to be applied at different PDCCH monitoring opportunities based at least in part on information indicating that DMRS time domain bundling is configured, and the UE may perform channel estimation based at least in part on the time domain bundling configuration. For example, as indicated by reference numeral 314, a downlink resource configuration for the UE may include a set of time and frequency resources in which the base station transmits a downlink signal to the UE. For example, the downlink resource configuration includes a set of PDCCH monitoring opportunities, wherein each PDCCH monitoring opportunity includes a set of symbols or time slots in which the base station uses a first set of frequency resources to transmit a PDCCH DMRS and the base station further uses a second set of frequency resources to transmit a PDCCH payload. In addition, the downlink resource configuration includes a set of PDSCH monitoring opportunities, some of which include a set of symbols or time slots in which the base station transmits PDSCH DMRS, and each of which includes a set of symbols or time slots in which the base station transmits PDCCH data. Accordingly, as described herein, the UE can perform channel estimation for a downlink from the base station based on a time domain bundling configuration to be applied to DMRS received in different monitoring opportunities (e.g., different PDCCH and / or PDSCH monitoring opportunities).

[0048] As in Figure 3BIn and as indicated by reference numeral 320, a base station may transmit a PDCCH in a cell-specific PDCCH monitoring opportunity, and a UE may receive the PDCCH. For example, in some aspects, a PDCCH transmitted in a cell-specific monitoring opportunity may be used to schedule broadcast information transmitted to all UEs in a cell associated with the base station. In this case, as indicated by reference numeral 322, the UE may assume a persistent bundling configuration only for PDCCH DMRS transmitted in a CSS used to schedule broadcast information. For example, while permanently bundling PDCCH DMRS over time may not be feasible for a PDCCH configured specifically for a UE (because the base station may adapt downlink transmission parameters to improve downlink performance of the UE), a time domain bundling configuration may distinguish UE-specific PDCCH monitoring opportunities from cell-specific monitoring opportunities. Accordingly, because the transmission parameters for the cell-specific PDCCH monitoring occasions are typically static (or semi-static) over time to enable different UEs to detect and decode the cell-wide information broadcast by the base station in the cell-specific PDCCH monitoring occasions, when PDCCH DMRS time-domain bundling is enabled, the UE may assume that the PDCCH DMRS time-domain bundling is permanent across the cell-specific PDCCH monitoring occasions. For example, in some aspects, the persistent bundling configuration may be applied to type 1-PDCCH CSS (e.g., related to random access), type 0-PDCCH CSS (e.g., for scheduling system information block type 1 (SIB1)), type 0A-PDCCH CSS (e.g., for scheduling other system information blocks), type 2-PDCCH CSS (e.g., for paging), etc. that do not have a dedicated RRC configuration.

[0049] As in Figure 3C In the figure and indicated by reference numeral 330, the base station may transmit information indicating whether the DMRS in the next UE-specific PDCCH monitoring opportunity is bundled with the DMRS in the current UE-specific PDCCH monitoring opportunity, and the UE may receive the information. For example, in the current PDCCH monitoring opportunity, the base station may transmit a PDCCH including a field (e.g., in the DCI) to indicate whether the DMRS in the next PDCCH monitoring opportunity is bundled with the DMRS in the current PDCCH monitoring opportunity.

[0050] For example, as indicated by reference numeral 332, the base station may configure the field in the PDCCH to indicate that the DMRS in the next PDCCH monitoring opportunity is bundled with the DMRS in the current PDCCH monitoring opportunity. In this way, the UE may assume phase continuity of the PDCCH DMRS from the current PDCCH monitoring opportunity to the next PDCCH monitoring opportunity, and perform joint channel estimation based at least in part on the PDCCH DMRS received in the current and next PDCCH monitoring opportunities. In addition, in some aspects, the base station may configure the field in the PDCCH to indicate the number of subsequent PDCCH monitoring opportunities in which the PDCCH DMRS is bundled with the PDCCH DMRS in the current PDCCH monitoring opportunity. In this case, the UE may perform joint channel estimation based at least in part on the PDCCH DMRS received in the current PDCCH DMRS monitoring opportunity and the next N PDCCH DMRS monitoring opportunities, where N is the number of subsequent PDCCH monitoring opportunities in which the PDCCH DMRS is bundled with the PDCCH DMRS in the current PDCCH monitoring opportunity.

[0051] Additionally or alternatively, as indicated by reference numeral 334, the base station may dynamically reset DMRS time domain bundling by configuring the field in the PDCCH to indicate that the DMRS in the next PDCCH monitoring opportunity is not to be bundled with the DMRS in the current PDCCH monitoring opportunity (e.g., by indicating that DMRS time domain bundling is enabled for zero (0) subsequent PDCCH monitoring opportunities). In this manner, the base station may dynamically change one or more PDCCH transmission parameters for the next PDCCH monitoring opportunity. For example, in some aspects, the base station may dynamically reset PDCCH DMRS bundling to change the MIMO precoder, beamforming filter, transmit power, and / or other parameters associated with the PDCCH transmission to the UE.

[0052] As in Figure 3D In the example and as indicated by reference numeral 340, the base station may transmit information for configuring the periodic PDCCH DMRS bundling pattern, and the UE may receive the information. Figure 3C) may provide the base station with the flexibility to dynamically adapt downlink transmission parameters, but the dynamic indication may be susceptible to the UE potentially losing (e.g., failing to receive and / or decode) the PDCCH including the dynamic indication. Accordingly, in some aspects, the base station may configure the PDCCH DMRS bundling pattern (e.g., via RRC signaling) to provide a semi-static bundling configuration that is more robust than the dynamic indication. For example, as indicated by reference numeral 342, the PDCCH DMRS bundling pattern may define a bundle (or bundling window) that includes a number of PDCCH monitoring opportunities (e.g., at the PDCCH DMRS time domain bundling enabled) in which PDCCH DMRS time domain bundling is enabled. Figure 3D In the example, one bundle includes three PDCCH monitoring opportunities.) Furthermore, as indicated by reference numeral 344, time domain bundling for PDCCH DMRS may be reset before the earliest PDCCH monitoring opportunity in each bundle.

[0053] As in Figure 3E In and as indicated by reference numeral 350, the base station may transmit information for configuring a semi-static periodic PDCCH DMRS bundling pattern, and the UE may receive the information; and the base station may further transmit dynamic signaling to indicate whether the bundle is to be reset before the earliest monitoring opportunity in each bundle. For example, the semi-static periodic PDCCH DMRS bundling pattern may generally be more robust than transmitting a dynamic indication in each PDCCH monitoring opportunity, and using a dynamic indication to indicate whether the bundle is to be reset before the earliest monitoring opportunity in each bundle may provide the base station with the flexibility to achieve DMRS phase continuity across different bundles without the need to adapt PDCCH transmission parameters.

[0054] Accordingly, as indicated by reference numeral 352, the PDCCH DMRS bundling pattern may define a bundling (or bundling window) including the PDCCH DMRS packets as described above. Figure 3DSeveral PDCCH monitoring occasions of the PDCCH DMRS time domain bundle are enabled in a manner similar to the manner described. In addition, the base station may transmit dynamic signaling (e.g., in DCI, MAC-CE, etc.) in a PDCCH monitoring occasion (e.g., the last PDCCH monitoring occasion in a bundle) to indicate whether the bundle is to be reset before the earliest PDCCH monitoring occasion in the next bundle. For example, as shown by reference numeral 354, the base station may configure dynamic signaling to indicate that the PDCCH DMRS in the next bundle is to be bundled with the PDCCH DMRS in the current bundle. In this way, the UE may assume phase continuity of the PDCCH DMRS received in the current bundle and the next bundle. Additionally or alternatively, as shown by reference numeral 356, the base station may configure dynamic signaling to indicate that the PDCCH DMRS time domain bundle is to be reset before the earliest PDCCH monitoring occasion in the next bundle. In this way, the base station can dynamically change one or more PDCCH transmission parameters for the PDCCH monitoring occasion in the next bundle. In addition, in the case where the UE does not receive or cannot decode dynamic signaling before the earliest PDCCH monitoring opportunity in the current bundle, the UE may assume that the PDCCH DMRS in the current bundle is bundled with the PDCCH DMRS in the previous bundle. Alternatively, in the case where the UE does not receive or cannot decode dynamic signaling before the earliest PDCCH monitoring opportunity in the current bundle, the UE may assume that the PDCCH DMRS in the current bundle is not bundled with the PDCCH DMRS in the previous bundle.

[0055] As in Figure 3FIn and as indicated by reference numeral 360, a base station may transmit information for configuring PDCCH DMRS bundling based at least in part on a PDCCH repetition configuration, and a UE may receive the information. For example, in some aspects, PDCCH repetition configuration may be enabled to improve PDCCH repetition and decoding performance of a UE (e.g., in a situation where the UE has reduced capabilities (such as a limited number of receive antennas), in a situation where the UE is located at the edge of a cell, etc.). Accordingly, in a situation where a base station configures PDCCH repetition for a UE, the base station may configure PDCCH DMRS bundling based at least in part on the PDCCH repetition configuration, because the base station may typically reuse the same downlink transmission parameters for each PDCCH. For example, as indicated by reference numeral 362, a UE may assume that the PDCCH DMRS is bundled in a time window in which the base station transmits multiple repetitions of the same PDCCH. In addition, as indicated by reference numeral 364, a UE may assume that the PDCCH DMRS is not bundled between time windows used to transmit different PDCCHs. Additionally or alternatively, the base station may provide dynamic signaling (e.g., DCI, MAC-CE, etc.) to explicitly indicate whether there is PDCCH DMRS bundling across repeated time windows in which different PDCCHs are transmitted (and therefore whether there is phase continuity) or whether the PDCCH DMRS bundling is to be reset between repeated time windows in which different PDCCHs are transmitted.

[0056] As in Figure 3G In and as indicated by reference numeral 370, a base station may transmit information for jointly configuring time domain bundling for PDCCH DMRS and PDSCH DMRS to enhance the overall downlink performance of the UE (e.g., because the base station may jointly configure precoders, beamforming filters, and / or other transmission parameters for PDCCH and PDSCH), and the UE may receive the information. For example, when both PDCCH DMRS time domain bundling and PDSCH DMRS time domain bundling are enabled and jointly configured, a dynamic time domain bundling configuration (e.g., indicated in dynamic signaling (such as DCI or MAC-CE)) and / or a semi-static time domain bundling configuration (e.g., indicated in semi-static signaling (such as RRC message)) may be jointly applied to PDCCH DMRS and PDSCH DMRS. For example, the joint configuration may include: a semi-static time domain bundling configuration that defines a periodic bundling pattern; a dynamic time domain bundling configuration that indicates whether to reset or maintain time domain bundling across different monitoring occasions or bundlings; and the like. For example, as Figure 3G As shown in , the semi-static time domain bundling configuration may define a periodic bundling pattern including three PDCCH monitoring opportunities in which the PDCCH DMRS is transmitted. Figure 3GIn the embodiment of the present invention, the periodic bundling pattern includes three PDSCH monitoring opportunities, each of which includes two PDSCH DMRS monitoring opportunities. Accordingly, as indicated by reference numeral 372, the UE may assume phase continuity of the PDCCH DMRS received in different PDCCH monitoring opportunities within a bundle. Similarly, as indicated by reference numeral 374, the UE may assume phase continuity of the PDSCH DMRS received in different PDSCH monitoring opportunities within the bundle. In addition, as indicated by reference numeral 376, dynamic signaling may indicate whether to reset the bundle or maintain phase continuity of the PDCCH DMRS and PDSCH DMRS transmitted in the next bundle.

[0057] As in Figure 3H In and as indicated by reference numeral 380, a base station may transmit information to configure a bundling relationship between a PDCCH DMRS and a PDSCH DMRS, and a UE may receive the information. For example, in some aspects, a UE may support DMRS bundling between a PDCCH DMRS and a subsequent PDSCH DMRS, which may be useful for scheduling a PDCCH in a type 0-PDCCH CSS of a SIB1 PDSCH in the same time slot as a PDCCH in a type 0-PDCCH CSS PDCCH (e.g., when the PDCCH to PDSCH time offset K0 is zero (0)). For example, as indicated by reference numeral 382, ​​a bundling relationship may be established between a PDCCH DMRS in a final PDCCH symbol of a PDCCH monitoring occasion and the earliest DMRS symbol of a PDSCH following the PDCCH monitoring occasion. Additionally or alternatively, in some aspects, a bundling relationship may be established between a PDCCH DMRS in a first PDCCH symbol of a PDCCH monitoring occasion and the last DMRS symbol of a PDSCH preceding the PDCCH monitoring occasion. Furthermore, in the case where a bundling relationship is configured between the PDCCH DMRS and the PDSCH DMRS, the PDCCH DMRS bundling and the PDSCH DMRS bundling may be enabled and configured (eg, semi-statically, dynamically, etc.).

[0058] In some aspects, in the case where PDCCH DMRS is bundled with PDSCH DMRS (e.g., Figure 3G and Figure 3H), the base station may transmit the PDCCH and the PDSCH at different transmit powers. Accordingly, in such a case, the base station may explicitly indicate the power difference between the PDCCH DMRS and the PDSCH DMRS to the UE. For example, in some aspects, the base station may indicate an energy per resource element (EPRE) offset between the PDCCH DMRS and the PDSCH DMRS that are bundled together, and the UE may receive the PDCCH DMRS and the PDSCH DMRS according to the indicated EPRE.

[0059] In addition, in the case where the PDCCH DMRS is bundled with the PDSCH DMRS, time domain bundling can be enabled for any suitable PDCCH and PDSCH (for example, regardless of whether the PDSCH is scheduled by the PDCCH with which the PDSCH is bundled or whether the PDSCH is in the same time slot as the PDCCH with which the PDSCH is bundled). However, as described above, the PDCCH in a type 0-PDCCH CSS and the SIB1 scheduled by the PDCCH are more likely to have the same downlink transmission parameters (for example, precoding matrix, beamforming filter, etc.). Accordingly, in some aspects, the base station can configure time domain bundling between the DMRS associated with the PDCCH in the type 0-PDCCH CSS and the DMRS in the first codeword of the PDSCH scheduled by the PDCCH. Additionally or alternatively, the PDCCH in a type 0-PDCCH CSS may have a one-to-one relationship with an associated synchronization signal block (SSB) (which may be considered a reference signal), whereby the base station may configure time domain bundling between the DMRS associated with the PDCCH in the type 0-PDCCH CSS and the SSB associated with the PDCCH monitoring opportunity in which the PDCCH is transmitted.

[0060] As indicated above, Figure 3A-3H are provided as one or more examples. Other examples may differ from those regarding Figure 3A-3H Examples described.

[0061] Figure 4 is a diagram illustrating an example process 400, performed, for example, by a UE, in accordance with various aspects of the present disclosure. Example process 400 is an example in which a UE (eg, UE 120, etc.) performs operations associated with DMRS time-domain bundling.

[0062] like Figure 4As shown in , in some aspects, process 400 may include receiving information from a base station indicating that DMRS time-domain bundling is enabled (block 410). For example, the UE may receive information from a base station indicating that DMRS time-domain bundling is enabled (e.g., using antenna 252, DEMOD 254, MIMO detector 256, receive processor 258, controller / processor 280, memory 282, etc.), as described above.

[0063] like Figure 4 As further shown in FIG. 4 , in some aspects, process 400 may include determining a time domain bundling configuration based at least in part on information indicating that DMRS time domain bundling is enabled (block 420). For example, the UE may determine the time domain bundling configuration based at least in part on information indicating that DMRS time domain bundling is enabled (e.g., using controller / processor 280, memory 282, etc.), as described above.

[0064] like Figure 4 As further shown in FIG. 4 , in some aspects, process 400 may include performing channel estimation based at least in part on the DMRS received in different PDCCH monitoring opportunities at least in part according to the time-domain bundling configuration (block 430). For example, the UE may (e.g., using antennas 252, DEMOD 254, MIMO detector 256, receive processor 258, controller / processor 280, memory 282, etc.) perform channel estimation based at least in part on the DMRS received in different PDCCH monitoring opportunities at least in part according to the time-domain bundling configuration as described above.

[0065] Process 400 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.

[0066] In a first aspect, the time domain bundling configuration includes a persistent bundling configuration for a CSS for scheduling broadcast information in different PDCCH monitoring occasions that vary from cell to cell.

[0067] In a second aspect, either alone or in combination with the first aspect, the time domain bundling configuration includes dynamic configuration based at least in part on a field in a current PDCCH monitoring opportunity, which indicates whether a DMRS in a next PDCCH monitoring opportunity is bundled with a DMRS in a current PDCCH monitoring opportunity.

[0068] In a third aspect, alone or in combination with one or more of the first and second aspects, the field in the current PDCCH monitoring opportunity further indicates the number of subsequent PDCCH monitoring opportunities in which the DMRS is bundled with the DMRS in the current PDCCH monitoring opportunity.

[0069] In a fourth aspect, alone or in combination with one or more of the first to third aspects, the time domain bundling configuration comprises a semi-static configuration based at least in part on a periodic pattern defining a bundle, the bundle comprising a plurality of PDCCH monitoring opportunities in which the DMRS are bundled.

[0070] In a fifth aspect, alone or in combination with one or more of the first to fourth aspects, DMRS time domain bundling is reset before the earliest PDCCH monitoring opportunity in the current bundling.

[0071] In a sixth aspect, either alone or in combination with one or more of the first to fifth aspects, the DMRS time domain bundling is reset before the earliest PDCCH monitoring opportunity in the current bundle at least in part based on dynamic downlink signaling received from the base station before the earliest PDCCH monitoring opportunity in the current bundle and / or the lack of dynamic downlink signaling indicating whether the bundle is to be reset before the earliest PDCCH monitoring opportunity in the current bundle.

[0072] In a seventh aspect, either alone or in combination with one or more of the first to sixth aspects, the DMRS in a current bundle is bundled with the DMRS in a previous bundle based at least in part on dynamic downlink signaling received from a base station before an earliest PDCCH monitoring opportunity in the current bundle and / or a lack of dynamic downlink signaling indicating whether to reset the bundle before an earliest PDCCH monitoring opportunity in the current bundle.

[0073] In the eighth aspect, alone or in combination with one or more of the first to seventh aspects, the information indicating that DMRS time domain bundling is enabled further indicates a time window in which repetitions of the PDCCH are to be transmitted, and the time domain bundling configuration includes different PDCCH monitoring opportunities in the time window in which repetitions of the PDCCH are to be transmitted.

[0074] In a ninth aspect, alone or in combination with one or more of the first to eighth aspects, DMRS time domain bundling is reset before an earliest PDCCH monitoring opportunity in the time window at which a repetition of a PDCCH is to be transmitted.

[0075] In a tenth aspect, either alone or in combination with one or more of the first to ninth aspects, the time domain bundling configuration includes a periodic bundling pattern that is jointly applied to DMRS received in different PDCCH monitoring opportunities and DMRS received in different PDSCH monitoring opportunities.

[0076] In an eleventh aspect, either alone or in combination with one or more of the first to tenth aspects, process 400 includes bundling a DMRS received in at least one PDCCH monitoring opportunity with an earliest symbol of a DMRS associated with a PDSCH preceding or following the at least one PDCCH monitoring opportunity.

[0077] In the twelfth aspect, alone or in combination with one or more of the first to eleventh aspects, process 400 includes receiving from a base station information related to an EPRE offset between a DMRS received in the at least one PDCCH monitoring opportunity and a PDSCH DMRS bundled with the DMRS received in the at least one PDCCH monitoring opportunity, and receiving the DMRS in the at least one PDCCH monitoring opportunity and the PDSCH DMRS based at least in part on the EPRE offset.

[0078] In a thirteenth aspect, alone or in combination with one or more of the first to twelfth aspects, the DMRS received in the at least one PDCCH monitoring opportunity is associated with a PDCCH in a type 0-PDCCH common search space that schedules the PDSCH.

[0079] In a fourteenth aspect, alone or in combination with one or more of the first to thirteenth aspects, process 400 includes bundling DMRS received in at least one PDCCH monitoring opportunity with SSBs associated with the at least one PDCCH monitoring opportunity.

[0080] although Figure 4 An example block diagram of process 400 is shown, but in some aspects, process 400 may include Figure 4 Additional blocks, fewer blocks, different blocks, or differently arranged blocks than those depicted in the process 400. Additionally or alternatively, two or more blocks of the process 400 may be executed in parallel.

[0081] 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.

[0082] As used herein, the term "component" is intended to be broadly interpreted as hardware, firmware, and / or a combination of hardware and software. As used herein, a processor is implemented with hardware, firmware, and / or a combination of hardware and software.

[0083] 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.

[0084] It will be apparent that the systems and / or methods 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 the 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.

[0085] 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).

[0086] Elements, actions or instructions used herein should not be interpreted as critical 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 terms "set" and "group" are intended to include one or more items (e.g., related items, non-related items, combinations of related items 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.

Claims

1. A wireless communication method performed by a user equipment UE, comprising: receiving information indicating that physical downlink control channel (PDCCH) demodulation reference signal (DMRS) time domain bundling is enabled from a base station; determining a time domain bundling configuration based at least in part on the information indicating that the DMRS time domain bundling is enabled; as well as Channel estimation is performed at least in part based on the time domain bundling configuration and at least in part based on DMRS received in different PDCCH monitoring opportunities, wherein the time domain bundling configuration includes dynamic configuration based at least in part on a field in a current PDCCH monitoring opportunity, the field indicating whether the DMRS in a next PDCCH monitoring opportunity is bundled with the DMRS in the current PDCCH monitoring opportunity. 2 . The method of claim 1 , wherein the time-domain bundling configuration comprises a persistent bundling configuration for a common search space for scheduling broadcast information in different PDCCH monitoring occasions that vary from cell to cell. 3 . The method of claim 1 , wherein the field in the current PDCCH monitoring opportunity further indicates the number of subsequent PDCCH monitoring opportunities in which a DMRS is bundled with the DMRS in the current PDCCH monitoring opportunity.

4. The method of claim 1, wherein the time domain bundling configuration comprises a semi-static configuration based at least in part on a periodic pattern defining a bundling, the bundling comprising a plurality of PDCCH monitoring opportunities in which DMRS are bundled. 5 . The method of claim 4 , wherein the DMRS time domain bundling is reset before the earliest PDCCH monitoring opportunity in the current bundling.

6. A method as claimed in claim 5, wherein the DMRS time domain bundling is reset before the earliest PDCCH monitoring opportunity in the current bundle at least in part based on one or more of the following: dynamic downlink signaling received from the base station before the earliest PDCCH monitoring opportunity in the current bundle, or a lack of dynamic downlink signaling indicating whether the bundle is to be reset before the earliest PDCCH monitoring opportunity in the current bundle.

7. A method as claimed in claim 4, wherein the DMRS in the current bundle is bundled with the DMRS in the previous bundle at least in part based on one or more of the following: dynamic downlink signaling received from the base station before the earliest PDCCH monitoring opportunity in the current bundle, or the lack of dynamic downlink signaling indicating whether to reset the bundle before the earliest PDCCH monitoring opportunity in the current bundle.

8. The method of claim 1, wherein the information indicating that the DMRS time domain bundling is enabled further indicates a time window in which repetitions of the PDCCH are to be transmitted, and wherein the time domain bundling configuration includes different PDCCH monitoring opportunities in the time window in which repetitions of the PDCCH are to be transmitted. 9 . The method of claim 8 , wherein the DMRS time domain bundling is reset before an earliest PDCCH monitoring opportunity in the time window in which a repetition of the PDCCH is to be transmitted.

10. The method of claim 1, wherein the time domain bundling configuration comprises a periodic bundling pattern jointly applied to DMRSs received in the different PDCCH monitoring opportunities and DMRSs received in different physical downlink shared channel monitoring opportunities.

11. The method of claim 1, further comprising: The DMRS received in at least one PDCCH monitoring opportunity is bundled with the earliest symbol of the DMRS associated with a physical downlink shared channel PDSCH before or after the at least one PDCCH monitoring opportunity.

12. The method of claim 11, further comprising: receiving, from the base station, information related to an energy per resource element (EPRE) offset between a DMRS received in the at least one PDCCH monitoring opportunity and a PDSCH DMRS bundled with the DMRS received in the at least one PDCCH monitoring opportunity; as well as A DMRS in the at least one PDCCH monitoring opportunity and the PDSCH DMRS are received based at least in part on the EPRE offset. 13 . The method of claim 11 , wherein the DMRS received in the at least one PDCCH monitoring opportunity is associated with a PDCCH in a Type 0-PDCCH common search space that schedules the PDSCH.

14. The method of claim 1, further comprising: A DMRS received in at least one PDCCH monitoring opportunity is bundled with a synchronization signal block associated with the at least one PDCCH monitoring opportunity.

15. A user equipment 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 information indicating that physical downlink control channel (PDCCH) demodulation reference signal (DMRS) time domain bundling is enabled from a base station; determining a time domain bundling configuration based at least in part on the information indicating that the DMRS time domain bundling is enabled; as well as Channel estimation is performed at least in part based on the time domain bundling configuration and at least in part based on DMRS received in different physical downlink control channel monitoring opportunities, wherein the time domain bundling configuration includes dynamic configuration based at least in part on a field in a current PDCCH monitoring opportunity, the field indicating whether the DMRS in a next PDCCH monitoring opportunity is bundled with the DMRS in the current PDCCH monitoring opportunity.

16. A non-transitory computer-readable medium storing one or more instructions for wireless communication, the one or more instructions comprising: One or more instructions that, when executed by one or more processors of user equipment, cause the one or more processors to: receiving information indicating that physical downlink control channel (PDCCH) demodulation reference signal (DMRS) time domain bundling is enabled from a base station; determining a time domain bundling configuration based at least in part on the information indicating that the DMRS time domain bundling is enabled; as well as Channel estimation is performed at least in part based on the time domain bundling configuration and at least in part based on DMRS received in different physical downlink control channel monitoring opportunities, wherein the time domain bundling configuration includes dynamic configuration based at least in part on a field in a current PDCCH monitoring opportunity, the field indicating whether the DMRS in a next PDCCH monitoring opportunity is bundled with the DMRS in the current PDCCH monitoring opportunity.

17. A device for wireless communication, comprising: A device for receiving information indicating that physical downlink control channel PDCCH demodulation reference signal DMRS time domain bundling is enabled from a base station; means for determining a time domain bundling configuration based at least in part on the information indicating that the DMRS time domain bundling is enabled; as well as An apparatus for performing channel estimation based at least in part on the time domain bundling configuration and at least in part on DMRS received in different physical downlink control channel monitoring opportunities, wherein the time domain bundling configuration includes a dynamic configuration based at least in part on a field in a current PDCCH monitoring opportunity, the field indicating whether the DMRS in a next PDCCH monitoring opportunity is bundled with the DMRS in the current PDCCH monitoring opportunity.

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