Indicating whether user equipment applies demodulation reference signal bundling

Abstract

Various aspects of the disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) can receive a request to apply demodulation reference signal (DMRS) bundling for uplink transmissions. The UE can transmit a plurality of uplink transmissions. The UE can transmit an indication of whether the UE can comply with the request based at least in part on whether the UE can maintain phase coherence across the plurality of uplink transmissions. Numerous other aspects are provided.

Description

[0001] Cross-reference to related applications

[0002] This patent application claims priority to U.S. Provisional Patent Application No. 63 / 143,532, filed January 29, 2021, entitled “INDICATING WHETHER DEMODULATION REFERENCE SIGNAL BUNDLING IS APPLIED BY A USER EQUIPMENT”, and U.S. Non-Provisional Patent Application No. 17 / 649,103, filed January 27, 2022, entitled “INDICATING WHETHER DEMODULATION REFERENCE SIGNAL BUNDLING IS APPLIED BY A USER EQUIPMENT”, which are expressly incorporated herein by reference. Technical Field

[0003] Various aspects of this disclosure generally relate to wireless communication, and more specifically to techniques and apparatus for instructing user equipment whether demodulation reference signal bonding is applied. Background Technology

[0004] Wireless communication systems are widely deployed to provide a variety of telecommunications services, such as telephone communication, video, data, messaging, and broadcasting. Typical wireless communication systems may employ multiple access technologies capable of supporting communication with multiple users by sharing available system resources (e.g., bandwidth or transmit power). 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 an enhanced set of the Universal Mobile Telecommunications System (UMTS) mobile standard released by the 3rd Generation Partnership Project (3GPP).

[0005] The aforementioned multiple access technologies have been adopted in various telecommunications standards to provide a common protocol enabling different user equipment to communicate at the municipal, national, regional, and even global levels. New Radio (NR), also known as 5G, is an enhancement set to the LTE mobile standard released by 3GPP. NR is designed to better integrate with other open standards by improving spectrum efficiency, reducing costs, improving service, utilizing new spectrum, and using Orthogonal Frequency Division Multiplexing (OFDM) with a Cyclic Prefix (CP) on the downlink (DL) and CP-OFDM and / or SC-FDM (e.g., also known as Discrete Fourier Transform Extended OFDM (DFT-s-OFDM)) on the uplink (UL), as well as supporting beamforming, multiple-input multiple-output (MIMO) antenna technologies, and carrier aggregation to better support mobile broadband Internet access. However, with the continued increase in demand for mobile broadband access, there is a need for further improvements to LTE and NR technologies. Preferably, these improvements are applicable to other multiple access technologies and telecommunications standards that employ these technologies.

[0006] In some examples, the base station can signal to the UE whether to enable demodulation reference signal (DMRS) binding for Physical Uplink Shared Channel (PUSCH) transmissions. DMRS binding can be used to perform joint channel estimation across time slots. In some examples, the base station can instruct the UE to apply DMRS binding to PUSCH transmissions that meet a set of conditions. This set of conditions may involve whether the UE can maintain phase coherence across PUSCH transmissions, such as whether PUSCH transmissions are transmitted using the same frequency resource allocation, the same transmit power, the same beam, or are transmitted sequentially in time, among other examples. However, in some scenarios, the base station cannot explicitly determine whether the set of conditions for PUSCH DMRS binding is met. This may lead to communication errors, inaccurate channel estimation by the base station, or the base station's inability to properly demodulate PUSCH transmissions, among other examples. Summary of the Invention

[0007] Some aspects described herein provide a method for wireless communication performed by a user equipment (UE). The method may include receiving a request to bind a demodulation reference signal (DMRS) for uplink transmissions. The method may include sending multiple uplink transmissions. The method may include sending an indication of whether the UE can comply with the request, at least in part based on whether the UE can maintain phase coherence across multiple uplink transmissions.

[0008] Some aspects described herein provide a method for wireless communication performed by a network entity, such as a base station. The method may include sending a request to a UE to apply DMRS binding to uplink transmissions. The method may include receiving multiple uplink transmissions. The method may include receiving an indication of whether the UE is capable of complying with the request to apply DMRS binding to multiple uplink transmissions.

[0009] The aspects described herein provide a UE for wireless communication. The UE may include memory and one or more processors operatively coupled to the memory. The UE may be configured to receive a request to apply DMRS binding to an uplink transmission. The UE may be configured to transmit multiple uplink transmissions. The UE may be configured to transmit an indication of whether the UE can comply with the request, at least in part based on whether the UE can maintain phase coherence across multiple uplink transmissions.

[0010] The aspects described herein provide a network entity for wireless communication. The network entity may include memory and one or more processors coupled to the memory. The network entity may be configured to send a request to the UE to apply DMRS binding to uplink transmissions. The network entity may be configured to receive multiple uplink transmissions. The network entity may be configured to receive an indication of whether the UE is capable of complying with the request to apply DMRS binding to multiple uplink transmissions.

[0011] The aspects provided herein offer a non-transitory computer-readable medium for storing a set of instructions for wireless communication. The instruction set may include one or more instructions that, when executed by one or more processors of the UE, cause the UE to receive a request to apply DMRS binding to uplink transmissions. The one or more instructions may cause the UE to send multiple uplink transmissions. The one or more instructions may cause the UE to send an indication of whether the UE can comply with the request, at least in part, based on whether the UE can maintain phase coherence across multiple uplink transmissions.

[0012] This document provides aspects of a non-transitory computer-readable medium for storing a set of instructions for wireless communication. The instruction set may include one or more instructions that, when executed by one or more processors of a network entity, cause the network entity to send a request to the UE to apply DMRS binding to uplink transmissions. One or more instructions may cause the network entity to receive multiple uplink transmissions. One or more instructions may cause the network entity to receive an indication of whether the UE is capable of complying with the request to apply DMRS binding to multiple uplink transmissions.

[0013] Some aspects provided herein offer an apparatus for wireless communication. The apparatus may include components for receiving a request to apply DMRS binding to an uplink transmission. The apparatus may include components for transmitting a plurality of uplink transmissions. The apparatus may include components for transmitting whether the apparatus can comply with the requested instruction, at least in part based on whether the apparatus can maintain phase coherence across the plurality of transmitted uplink transmissions.

[0014] This document provides an apparatus for wireless communication. The apparatus may include components for sending a request to a UE to apply DMRS binding to an uplink transmission. The apparatus may include components for receiving multiple uplink transmissions. The apparatus may include components for receiving an indication of whether the UE is capable of complying with the request to apply DMRS binding to multiple uplink transmissions.

[0015] The aspects generally include, as described generally with reference to the accompanying drawings and description, and as shown in the accompanying drawings and description, methods, apparatus, systems, computer program products, non-transitory computer-readable media, user equipment, network entities, base stations, wireless communication equipment, or processing systems.

[0016] The foregoing has provided a fairly broad overview of the features and technical advantages of the examples according to this disclosure in order to better understand the following detailed description. Additional features and advantages will be described below. The disclosed concepts and specific examples can readily serve as the basis for modifications or designs of other structures used to achieve the same purpose of this disclosure. Such equivalent constructions do not depart from the scope of the appended claims. The features of the concepts disclosed herein, their organization and operation, and related advantages will be better understood from the following description when considered in conjunction with the accompanying drawings. Each drawing is provided for illustrative and descriptive purposes and not as a definition of limitation of the claims. Attached Figure Description

[0017] To gain a detailed understanding of the foregoing features of this disclosure, a more specific description of the above-briefly summarized contents can be obtained by referring to various aspects, some of which are illustrated in the accompanying drawings. However, it should be noted that the drawings illustrate only certain typical aspects of this disclosure and should not be considered as limiting its scope, as the description may allow for other equivalent aspects. The same reference numerals in different drawings may identify the same or similar elements.

[0018] Figure 1 This is a diagram illustrating an example of a wireless network according to the present disclosure.

[0019] Figure 2 This is a diagram illustrating an example base station (BS) communicating with a user equipment (UE) in a wireless network according to the present disclosure.

[0020] Figure 3 This is a diagram illustrating an example of physical channels and reference signals in a wireless network according to the present disclosure.

[0021] Figure 4 This is a diagram illustrating an example of a demodulation reference signal (DMRS) binding according to this disclosure.

[0022] Figure 5 This is a diagram illustrating examples of different time slot modes according to this disclosure.

[0023] Figures 6-9 This is a diagram illustrating an example of an indication of whether a demodulation reference signal binding is applied according to this disclosure.

[0024] Figure 10 This is a flowchart illustrating an example process performed by a UE according to this disclosure.

[0025] Figure 11 This is a flowchart illustrating an example process performed by a base station according to the present disclosure.

[0026] Figure 12 and Figure 13 This is a block diagram of an example device for wireless communication according to the present disclosure. Detailed Implementation

[0027] Various aspects of this disclosure are described more fully below with reference to the accompanying drawings. However, this disclosure may be embodied in many different forms and should not be construed as limited to any particular structure or function presented throughout this disclosure. Rather, these aspects are provided so that this disclosure will be comprehensive and complete, and will fully convey the scope of this disclosure to those skilled in the art. Based on the teachings herein, those skilled in the art will understand that the scope of this disclosure is intended to cover any aspect of this disclosure disclosed herein, whether implemented independently of or in combination with any other aspect of this disclosure. For example, any number of aspects set forth herein may be used to implement an apparatus or practice. Furthermore, the scope of this disclosure is intended to cover such apparatus or methods practiced using structures, functions, or structures and functions other than or different from the aspects of this disclosure set forth herein. Any aspect of this disclosure disclosed herein may be embodied by one or more elements of the claims.

[0028] Several aspects of a telecommunications system will now be presented with reference to various devices and technologies. These devices and technologies will be described in detail below and illustrated in the accompanying drawings by various blocks, modules, components, circuits, steps, processes, algorithms, etc. (collectively, “elements”). These elements can be implemented using hardware, software, or a combination of hardware and software. Whether such elements are implemented as hardware or software depends on the specific application and the design constraints imposed on the entire system.

[0029] Various aspects generally involve enabling a user equipment (UE) to indicate to a base station whether the UE can comply with a request from the base station to apply demodulation reference signal (DMRS) binding to uplink transmissions. Some aspects more specifically involve UE transmissions that indicate, at least in part, whether the UE can maintain phase coherence and comply with the DMRS binding request from the base station based on whether the UE can maintain phase coherence across multiple uplink transmissions (such as Physical Uplink Shared Channel (PUSCH) communication or Unprofitable Uplink Control Channel (PUCCH) communication). In some aspects, the UE can send an indication of PUSCH transmissions in uplink control information (UCI) multiplexed with PUSCH transmissions, enabling implicit indication of PUSCH transmissions with applied coherence indication. In some aspects, the UE can use a DMRS sequence for DMRS to send the indication, and the DMRS sequence selected by the UE can indicate whether the UE can comply with the DMRS binding request. In some aspects, the UE can use a DMRS port for DMRS to send the indication, and the DMRS port selected by the UE can indicate whether the UE can comply with the DMRS binding request.

[0030] Specific aspects of the subject matter described in this disclosure can be implemented to achieve one or more of the following potential advantages. In some examples, the described techniques can be used to provide a clear indication of whether different uplink transmissions are phase-coherent with each other. Therefore, the base station can correctly determine when to perform joint channel estimation for uplink transmissions using multiple DMRSs, thereby improving the accuracy of channel estimation, reducing communication errors, and improving the demodulation of PUSCH transmissions. Furthermore, in some examples, the described techniques allow the base station to have some control over DMRS binding while increasing the flexibility of UE transmission and operation by enabling the UE to apply DMRS binding in a manner different from what the base station requests.

[0031] Figure 1 This is a diagram illustrating example 100 of a wireless network according to this disclosure. The wireless network may be or may include elements of a 5G (NR) network or an LTE network, as well as other examples. The wireless network may include multiple base stations 110 (shown as BS110a, BS 110b, BS 110c, and BS 110d) and other network entities. A base station (BS) is a network entity that communicates with a user equipment (UE) and may also be referred to as an NR BS, Node B, gNB, 5G Node B (NB), access point, or Transmit / Receive Point (TRP), as well as other examples. Each BS may provide communication coverage for a specific geographic area. In 3GPP, the term "cell" may refer to the coverage area of ​​a BS or a BS subsystem serving that coverage area, depending on the context in which the term is used.

[0032] In some aspects, the term "base station" (e.g., base station 110) or "network entity" may refer to an aggregation base station, a decomposition base station, an integrated access and backhaul (IAB) node, a relay node, and / or one or more components thereof. For example, in some aspects, "base station" or "network entity" may refer to a central unit (CU), a distributed unit (DU), a radio unit (RU), a near-real-time (NRT) RAN intelligent controller (RIC), or a non-real-time (Non-RT) RIC, or a combination thereof. In some aspects, the term "base station" or "network entity" may refer to a device configured to perform one or more functions (such as those described herein in conjunction with base station 110). In some aspects, the term "base station" or "network entity" may refer to multiple devices configured to perform one or more functions. For example, in some distributed systems, each of multiple different devices (possibly located in the same geographical location or different geographical locations) may be configured to perform at least a portion of the functions, or replicate the performance of at least a portion of the functions, and the term "base station" or "network entity" may refer to any one or more of those different devices. In some aspects, the term "base station" or "network entity" may refer to one or more virtual base stations and / or one or more virtual base station functions. For example, in some aspects, two or more base station functions may be instantiated on a single device. In some aspects, the term "base station" or "network entity" may refer to one base station function rather than another. Thus, a single device may include more than one base station.

[0033] A BS can provide communication coverage for macrocells, picocells, femtocells, or another type of cell. A macrocell can cover a relatively large geographic area (e.g., a radius of several kilometers) and can allow unrestricted access for UEs with service subscriptions. A picocell can cover a relatively small geographic area and can allow unrestricted access for UEs with service subscriptions. A femtocell can cover a relatively small geographic area (e.g., a home) and can allow restricted access for UEs associated with the femtocell (e.g., UEs in a Closed Subscriber Group (CSG)). A BS used for macrocells can be called a macro BS. A BS used for picocells can be called a pico BS. A BS used for femtocells can be called a femto BS or a home BS. A BS can support one or more (e.g., three) cells.

[0034] Wireless networks can be heterogeneous networks comprising different types of Base Stations (BSs) (e.g., macro BSs, pico BSs, femto BSs, or relay BSs). These different types of BSs can have different transmit power levels, different coverage areas, and different effects on interference in the wireless network. For example, macro BSs can have high transmit power levels (e.g., 5 to 40 watts), while pico BSs, femto BSs, and relay BSs can have lower transmit power levels (e.g., 0.1 to 2 watts). BSs in Figure 1 In the example shown, BS 110a can be a macro BS for macro cell 102a, BS 110b can be a pico BS for pico cell 102b, and BS 110c can be a femto BS for femto cell 102c. Network controller 130 can be coupled to a set of BSs 102a, 102b, 110a, and 110b, and can provide coordination and control for these BSs. Network controller 130 can communicate with the BSs via backhaul. The BSs can also communicate with each other via wireless or wired backhaul, for example, directly or indirectly.

[0035] In some respects, a cell may not necessarily be static; instead, the geographical area of ​​the cell may move depending on the location of the mobile BS. In some respects, BSs may interconnect with each other or connect to one or more other BSs or network nodes (not shown) using any suitable transport network through various types of backhaul interfaces (such as direct physical connections or virtual networks).

[0036] The wireless network 100 may also include relay stations. A relay station is an entity that can receive data transmissions from an upstream station (e.g., a BS or a UE) and send data transmissions to a downstream station (e.g., a UE or a BS). A relay station can also be a UE that can relay transmissions for other UEs. Figure 1 In the example shown, relay BS 110d can communicate with macro BS 110a and UE 120d to facilitate communication between BS 110a and UE 120d. A relay BS can also be referred to as a relay station, relay base station, relay, and other examples.

[0037] UEs 120 (e.g., 120a, 120b, 120c) may be distributed throughout the wireless network, and each UE may be stationary or mobile. A UE may also be referred to as an access terminal, terminal, mobile station, subscriber unit, station, and other examples. A UE may be a cellular phone (e.g., a smartphone), a personal digital assistant (PDA), a wireless modem, a wireless communication device, a handheld device, a laptop computer, a cordless phone, a wireless local loop (WLL) station, a tablet computer, a camera, a gaming device, a netbook, a smartbook, an ultrabook, a medical device or equipment, a biosensor / device, a wearable device (smartwatch, 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 GPS device, or any other suitable device configured to communicate via a wireless medium.

[0038] Some UEs can be considered Machine-Type Communication (MTC) or Evolved or Enhanced Machine-Type Communication (eMTC) UEs. MTC and eMTC UEs include, for example, robots, drones, remote devices, sensors, meters, monitors, or location tags, and other examples, that can communicate with a base station, another device (e.g., a remote device), or some other entity. For example, a wireless node can provide connectivity to or to a network (e.g., a wide area network such as the Internet or a cellular network) via a wired or wireless communication link. Some UEs can be considered Internet of Things (IoT) devices, or can be implemented as NB-IoT (Narrowband Internet of Things) devices. Some UEs can be considered Customer Premises Equipment (CPE). UE 120 can be included within a housing that houses the components of UE 120, such as processor components, memory components, and other examples.

[0039] Typically, any number of wireless networks can be deployed in a given geographic area. Each wireless network can support a specific Radio Access Technology (RAT) and can operate on one or more frequencies or frequency channels. A frequency can also be referred to as a carrier, and other examples. Each frequency can support a single RAT in a given geographic area to avoid interference between wireless networks using different RATs. In some cases, NR or 5G RAT networks can be deployed.

[0040] In some aspects, two or more UEs 120 (e.g., shown as UE 120a and UE 120e) may communicate directly with each other using one or more sidelink channels (e.g., without using base station 110 as an intermediary). 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 or vehicle-to-infrastructure (V2I) protocols), mesh networks, or combinations thereof. In such examples, UE 120 may perform scheduling operations, resource selection operations, or other operations performed by base station 110 as described elsewhere herein.

[0041] Devices in a wireless network can communicate using the electromagnetic spectrum, which can be subdivided into various categories, bands, or channels based on frequency or wavelength. For example, devices in a wireless network can communicate using an operating band with a first frequency range (FR1), which can span from 410 MHz to 7.125 GHz. As another example, devices in a wireless network can communicate using an operating band with a second frequency range (FR2), which can span from 24.25 GHz to 52.6 GHz. The frequencies between FR1 and FR2 are sometimes referred to as mid-band frequencies. Although a portion of FR1 is above 6 GHz, FR1 is often referred to as the "sub-6 GHz" band. Similarly, FR2 is often referred to as the "millimeter wave" band, although it is different from the extremely high frequency (EHF) band (30 GHz–300 GHz) designated as "millimeter wave" by the International Telecommunication Union (ITU). Therefore, unless otherwise explicitly stated, the term "below 6 GHz" should be understood to broadly refer to frequencies below 6 GHz, frequencies within FR1, intermediate frequency band frequencies (e.g., above 7.125 GHz), or combinations thereof. Similarly, unless otherwise explicitly stated, the term "millimeter wave" should be understood to broadly refer to frequencies within the EHF band, frequencies within FR2, intermediate frequency band frequencies (e.g., below 24.25 GHz), or combinations thereof. The frequencies included in FR1 and FR2 can be modified, and the techniques described herein are applicable to those modified frequency ranges.

[0042] Figure 2 This is a diagram illustrating an example 200 of a base station communicating with a UE in a wireless network according to the present disclosure. The base station may correspond to... Figure 1 Base station 110. Similarly, the UE can correspond to Figure 1 UE 120.

[0043] Base station 110 may be equipped with T antennas 234a to 234t, and UE 120 may be equipped with R antennas 252a to 252r, where typically T ≥ 1 and R ≥ 1. At base station 110, transmitting processor 220 may receive data for one or more UEs from data source 212, select one or more modulation and coding schemes (MCS) for each UE based at least in part on channel quality indicators (CQI) received from the UE, process (e.g., encode) data for each UE based at least in part on the MCS selected for the UE, and provide data symbols for all UEs. Transmitting processor 220 may also process system information (e.g., for semi-static resource partitioning information (SRPI) and other examples) and control information (e.g., CQI requests, grants, or upper-layer signaling) and provide overhead symbols and control symbols. Transmitting processor 220 may also generate reference symbols for reference signals and synchronization signals. The transmit (TX) multiple-input multiple-output (MIMO) processor 230 can perform spatial processing (e.g., precoding, if applicable) on data symbols, control symbols, overhead symbols, or reference symbols, and can provide T output symbol streams to T modulators (MODs) 232a to 232t. Each MOD 232 can (e.g., for OFDM and other examples) process its respective output symbol stream to obtain an output sample stream. Each MOD 232 can 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 MODs 232a to 232t can be transmitted via T antennas 234a to 234t respectively.

[0044] At UE 120, antennas 252a to 252r can receive downlink signals from base station 110 or other base stations and can provide the received signals to R demodulators (DEMODs) 254a to 254r respectively. Each DEMOD 254 can adjust (e.g., filter, amplify, downconvert, and digitize) the received signal to obtain an input sample. Each DEMOD 254 can further process the input sample (e.g., for OFDM) to obtain a received symbol. MIMO detector 256 can obtain the received symbol from all R DEMODs 254a to 254r, perform MIMO detection on the received symbol (if applicable), and provide the detected symbol. Receiver processor 258 can process (e.g., demodulate) the detected symbol, provide data for decoding of UE 120 to data sink 260, and provide decoded control information and system information to controller / processor 280. The term "controller / processor" can refer to one or more controllers, one or more processors, or a combination of one or more controllers and one or more processors. The channel processor can determine one or more parameters, such as the Reference Signal Received Power (RSRP) parameter, the Received Signal Strength Indication (RSSI) parameter, the Reference Signal Received Quality (RSRQ) parameter, or the Channel Quality Indicator (CQI) parameter, as well as others. In some aspects, one or more components of the UE 120 may be included in the housing.

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

[0046] Antennas (such as antennas 234a to 234t or antennas 252a to 252r) may include or be included in one or more antenna panels, antenna groups, antenna element sets, or antenna arrays, among other examples. Antenna panels, antenna groups, antenna element sets, or antenna arrays may include one or more antenna elements. Antenna panels, antenna groups, antenna element sets, or antenna arrays may include coplanar antenna element sets or non-coplanar antenna element sets. Antenna panels, antenna groups, antenna element sets, or antenna arrays may include antenna elements within a single housing or antenna elements within multiple housings. Antenna panels, antenna groups, antenna element sets, or antenna arrays may include antenna elements coupled to one or more transmitting and / or receiving components (such as...) Figure 2 One or more antenna elements (one or more components).

[0047] On the uplink, at UE 120, the transmitting processor 264 can receive and process data from data source 262 and control information from controller / processor 280 (e.g., for reports including RSRP, RSSI, RSRQ, or CQI). The transmitting processor 264 can also generate reference symbols for one or more reference signals. Symbols from the transmitting processor 264 can be pre-coded (if applicable) by the TX MIMO processor 266, further processed by MODs 254a to 254r (e.g., Extended Orthogonal Frequency Division Multiplexing for Discrete Fourier Transform (DFT-s-OFDM) or Orthogonal Frequency Division Multiplexing with Cyclic Prefix (CP) (CP-OFDM)), and transmitted to base station 110. In some aspects, the modulator and demodulator of UE 120 (e.g., MOD / DEMOD 254) can be included in the modem of UE 120. In some aspects, UE 120 includes a transceiver. The transceiver may include any combination of antenna 252, modulator 254, demodulator 254, MIMO detector 256, receive processor 258, transmit processor 264, or TX MIMO processor 266. The transceiver may be used by a processor (e.g., controller / processor 280) and memory 282 to perform aspects of any of the methods described herein.

[0048] At base station 110, uplink signals from UE 120 and other UEs can be received by antenna 234, processed by DEMOD 232, detected by MIMO detector 236 (if applicable), and further processed by receiver processor 238 to obtain decoded data and control information transmitted by UE 120. Receiver processor 238 can provide the decoded data to data sink 239 and the decoded control information to controller / processor 240. Base station 110 may include communication unit 244 and communicate with network controller 130 via communication unit 244. Base station 110 may include scheduler 246 to schedule UE 120 for downlink and uplink communication. In some aspects, the modulator and demodulator (e.g., MOD / DEMOD 232) of base station 110 may be included in the modem of base station 110. In some aspects, base station 110 includes a transceiver. The transceiver may include any combination of antenna 234, modulator 232, demodulator 232, MIMO detector 236, receiver processor 238, transmitter processor 220, and / or TX MIMO processor 230. The transceiver may be used by a processor (e.g., controller / processor 240) and memory 242 to perform aspects of any of the methods described herein.

[0049] The controller / processor 240 of base station 110, the controller / processor 280 of UE 120 or Figure 2 Any other component may perform one or more techniques associated with instructing UE 120 whether to apply demodulation reference signal (DMRS) binding, as described in more detail elsewhere herein. For example, the controller / processor 240 of base station 110, the controller / processor 280 of UE 120, or... Figure 2 Any other component can execute or direct, for example Figure 10 Process 1000 Figure 11 The operation of process 1100 or other processes as described herein. Memory 242 and 282 may store data and program code of base station 110 and UE 120, respectively. In some aspects, memory 242 or memory 282 may include a non-transitory computer-readable medium storing one or more instructions (e.g., code and / or program code) for wireless communication. For example, one or more instructions, when executed by one or more processors of base station 110 or UE 120 (e.g., directly or after compilation, translation, or interpretation), may cause one or more processors, UE 120, or base station 110 to perform or direct, for example... Figure 10 Process 1000 Figure 11 The operation of process 1100 or other processes as described herein. In some aspects, execution instructions may include run instructions, translation instructions, compilation instructions, or interpretation instructions, among others.

[0050] In some aspects, the UE (e.g., UE120) includes components for receiving a request to apply DMRS binding to an uplink transmission; components for transmitting multiple uplink transmissions; and / or components for indicating whether the device can comply with the request, at least in part, based on whether the device can maintain phase coherence across the multiple transmitted uplink transmissions. Components for the UE to perform the operations described herein may include one or more of, for example, antenna 252, demodulator 254, MIMO detector 256, receive processor 258, transmit processor 264, TX MIMO processor 266, modulator 254, controller / processor 280, or memory 282.

[0051] In some aspects, the UE includes means for determining a particular DMRS sequence based at least in part on a formula for a sequence initialization seed, the formula including parameters indicating whether the UE can maintain phase coherence across uplink transmissions and one or more other uplink transmissions. In some aspects, the UE includes means for transmitting a DMRS sequence associated with an uplink transmission that is the same as the DMRS sequence for one or more other uplink transmissions to indicate that the UE can maintain phase coherence across uplink transmissions and one or more other uplink transmissions, or for transmitting a DMRS sequence associated with an uplink transmission that is different from the DMRS sequence for one or more other uplink transmissions to indicate that the UE cannot maintain phase coherence across uplink transmissions and one or more other uplink transmissions. In some aspects, the UE includes means for selecting a particular DMRS sequence from a pool of DMRS sequences comprising at least three DMRS sequences, wherein a different DMRS sequence is selected as the next DMRS sequence in the pool.

[0052] In some aspects, network entities (e.g., base station 1100) include components for sending a request to the UE to apply DMRS binding to uplink transmissions; components for receiving multiple uplink transmissions; and / or components for receiving whether the UE is able to comply with the request to apply DMRS binding to multiple uplink transmissions. Components for the network entity to perform the operations described herein may include one or more of, for example, a transmit processor 220, a TX MIMO processor 230, a modulator 232, an antenna 234, a demodulator 232, a MIMO detector 236, a receive processor 238, a controller / processor 240, a memory 242, or a scheduler 246.

[0053] In some aspects, the network entity includes components for performing joint channel estimation across all or a subset of multiple uplink transmissions, based at least in part on whether the UE is able to comply with a requested instruction. In some aspects, the network entity includes components for identifying a subset of multiple uplink transmissions to which joint channel estimation is to be applied, based at least in part on whether the UE is able to comply with a requested instruction; or for performing joint channel estimation across a subset of multiple uplink transmissions. In some aspects, the network entity includes components for receiving a DMRS sequence associated with an uplink transmission that is the same as the DMRS sequence for one or more other uplink transmissions to indicate that the UE is able to maintain phase coherence across the uplink transmission and one or more other uplink transmissions; or for receiving a DMRS sequence associated with an uplink transmission that is different from the DMRS sequence for one or more other uplink transmissions to indicate that the UE cannot maintain phase coherence across the uplink transmission and one or more other uplink transmissions.

[0054] Figure 3 This is a diagram illustrating example 300 of a physical channel and reference signal in a wireless network according to this disclosure. Figure 3 As shown, the downlink channel and downlink reference signal can carry information from base station 110 to UE 120, and the uplink channel and uplink reference signal can carry information from UE 120 to base station 110.

[0055] As shown, downlink channels may include a Physical Downlink Control Channel (PDCCH) carrying downlink control information (DCI), a Physical Downlink Shared Channel (PDSCH) carrying downlink data, or a Physical Broadcast Channel (PBCH) carrying system information, among other examples. In some aspects, PDSCH communication may be scheduled by PDCCH communication. As further shown, uplink channels may include a Physical Uplink Control Channel (PUCCH) carrying uplink control information (UCI), a Physical Uplink Shared Channel (PUSCH) carrying uplink data, or a Physical Random Access Channel (PRACH) for initial network access, among other examples. In some aspects, UE 120 may send acknowledgment (ACK) or negative acknowledgment (NACK) feedback (e.g., ACK / NACK feedback or ACK / NACK information) in the UCI on the PUCCH or PUSCH.

[0056] As further illustrated, downlink reference signals may include synchronization signal blocks (SSBs), channel state information (CSI) reference signals (CSI-RS), DMRS, positioning reference signals (PRS), or phase tracking reference signals (PTRS), among other examples. Also as illustrated, uplink reference signals may include sounding reference signals (SRS), DMRS, or PTRS, among other examples.

[0057] SSBs can carry information for initial network acquisition and synchronization, such as the primary synchronization signal (PSS), secondary synchronization signal (SSS), PBCH, and PBCH DMRS. SSBs are sometimes referred to as synchronization signal / PBCH (SS / PBCH) blocks. In some aspects, base station 110 can transmit multiple SSBs on multiple corresponding beams, and SSBs can be used for beam selection.

[0058] CSI-RS can carry information for downlink channel estimation (e.g., downlink CSI acquisition), which can be used for scheduling, link adaptation, beam management, and other examples. Base station 110 can configure a set of CSI-RS for UE 120, and UE 120 can measure the configured set of CSI-RS. Based at least in part on the measurement, UE 120 can perform channel estimation and can report (e.g., in a CSI report) channel estimation parameters to base station 110, such as Channel Quality Indicator (CQI), Precoding Matrix Indicator (PMI), CSI-RS Resource Indicator (CRI), Layer Indicator (LI), Rank Indicator (RI), or Reference Signal Received Power (RSRP), and other examples. Base station 110 can use the CSI report to select transmission parameters for downlink communication to UE 120, such as the number of transport layers (e.g., rank), precoding matrix (e.g., precoder), modulation and coding scheme (MCS), or improved downlink beaming (e.g., using a beam improvement process or beam management process), and other examples.

[0059] DMRS can carry information used to estimate radio channels for demodulating associated physical channels (e.g., PDCCH, PDSCH, PBCH, PUCCH, or PUSCH). The design and mapping of DMRS can be specific to the physical channels to which it will be used for estimation. DMRS is UE-specific, can be beamformed, can be restricted to scheduled resources (e.g., not transmitted over broadband), and can be transmitted only when necessary. As shown, DMRS is used for both downlink and uplink communications.

[0060] PTRS can carry information for compensating oscillator phase noise. Typically, phase noise increases with increasing oscillator carrier frequency. Therefore, PTRS can be used at high carrier frequencies (such as millimeter-wave frequencies) to mitigate phase noise. PTRS can be used to track the phase of a local oscillator and achieve suppression of phase noise and common phase error (CPE). As shown, PTRS is used for both downlink communication (e.g., on PDSCH) and uplink communication (e.g., on PUSCH).

[0061] The PRS can carry information for timing or ranging measurements of the UE 120 based on signals transmitted by base station 110, to improve observed time difference of arrival (OTDOA) positioning performance. For example, the PRS can be a pseudo-random quadrature phase shift keying (QPSK) sequence mapped to a diagonal pattern with frequency and time offsets to avoid collisions with cell-specific reference signals and control channels (e.g., PDCCH). Typically, the PRS can be designed to improve the detectability of the UE 120, which may need to detect downlink signals from multiple neighboring base stations to perform OTDOA-based positioning. Therefore, the UE 120 can receive PRS from multiple cells (e.g., a reference cell and one or more neighboring cells) and can report the reference signal time difference (RSTD) based on the OTDOA measurements associated with the PRS received from the multiple cells. In some aspects, base station 110 can then calculate the location of the UE 120 based on the RSTD measurements reported by the UE 120.

[0062] The SRS can carry information for uplink channel estimation, which can be used for scheduling, link adaptation, precoder selection, beam management, and other examples. Base station 110 can configure one or more SRS resource sets for UE 120, and UE 120 can transmit SRS on the configured SRS resource sets. The SRS resource sets can have configured uses, such as for uplink CSI acquisition based on reciprocal operations, downlink CSI acquisition, uplink beam management, and other examples. Base station 110 can measure the SRS, can perform channel estimation at least in part based on the measurement, and can use the SRS measurement to configure communication with UE 120.

[0063] Figure 4 This is a diagram illustrating example 400 of a DMRS binding according to this disclosure. The DMRS of the PUSCH (sometimes called the PUSCHDMRS) can carry information used to estimate the radio channel for demodulating PUSCH transmissions on the PUSCH. The design and mapping of the PUSCH DMRS can be specific to the DMRS used for its estimation of the PUSCH.

[0064] When DMRS binding is not performed, the base station can perform separate channel estimation for different PUSCH transmissions. For example, without DMRS binding, the base station can perform channel estimation (sometimes called slot-specific channel estimation) to demodulate the PUSCH transmission using only the DMRS corresponding to the PUSCH transmission (e.g., without using any other DMRS). In some examples, the DMRS corresponding to the PUSCH transmission may be a DMRS transmitted in the same time domain resources as the PUSCH transmission (e.g., the same time slot or the same micro-time slot). Therefore, a DMRS transmission without DMRS binding can be referred to as a slot-specific DMRS transmission.

[0065] Reference Figure 4 When DMRS binding is not performed, the base station can estimate the demodulation of the PUSCH for the first PUSCH transmission 420-1 by performing a separate channel estimation on the first PUSCH transmission 420-1 using only the first DMRS 410-1 (and without using any of the second DMRS 410-2, third DMRS 410-3, or fourth DMRS 410-4). As shown, the first DMRS 410-1 and the first PUSCH transmission 420-1 occur in the same time slot. Similarly, the base station can estimate the PUSCH for demodulation of the second PUSCH transmission 420-2 by performing a separate channel estimation on the second PUSCH transmission 420-2 using only the second DMRS 410-2, estimate the PUSCH for demodulation of the third PUSCH transmission 420-3 by performing a separate channel estimation on the third PUSCH transmission 420-3 using only the third DMRS 410-3, and estimate the PUSCH for demodulation of the fourth PUSCH transmission 420-4 by performing a separate channel estimation on the fourth PUSCH transmission 420-4 using only the fourth DMRS 410-4.

[0066] To improve channel estimation, the base station can instruct (e.g., command) the UE to apply (or execute) DMRS binding for PUSCH (sometimes referred to as PUSCH DMRS binding). When applying or executing DMRS binding, the base station can perform joint channel estimation (sometimes referred to as coherent channel estimation or cross-slot channel estimation) for different PUSCH transmissions, which improves the accuracy of channel estimation and thus improves performance. For example, using DMRS binding, the base station can use multiple DMRS corresponding to multiple PUSCH transmissions (e.g., a demodulated PUSCH transmission and one or more other PUSCH transmissions) to perform channel estimation for demodulated PUSCH transmissions. In some examples, at least one of the DMRS used for channel estimation of the PUSCH transmission is transmitted in a different time-domain resource (e.g., a different time slot or a different micro-time slot) than the PUSCH transmission. Therefore, a DMRS transmission with DMRS binding can be referred to as a cross-slot DMRS transmission.

[0067] Reference Figure 4 When performing DMRS binding, the base station can use a first DMRS 410-1 and at least one of a second DMRS 410-2, a third DMRS 410-3, or a fourth DMRS 410-4 to perform joint channel estimation for the first PUSCH transmission 420-1, estimating the demodulation of the PUSCH for the first PUSCH transmission 420-1. The base station can perform joint channel estimation for the second, third, or fourth PUSCH transmissions in a similar manner, such as by using the corresponding DMRS and one or more other DMRSs. Different transmissions in the first, second, third, and fourth PUSCH transmissions can be different repetitions of the same PUSCH transmission (e.g., on multiple time slots for PUSCH repetition type A or in the same time slot for PUSCH repetition type B), or they can be different PUSCH transmissions carrying different transport blocks.

[0068] For accurate joint estimation of PUSCH transmissions using multiple DMRSs to be possible, the multiple DMRSs (and their corresponding PUSCH transmissions) need to be phase coherent with each other. Phase coherence is sometimes also referred to as phase continuity. Therefore, when a UE performs DMRS binding for multiple PUSCH transmissions, the UE must maintain phase coherence (or phase continuity) across multiple PUSCH transmissions (e.g., across PUSCH symbols transmitting the PUSCH transmissions) so that the base station can obtain accurate joint channel estimation for the multiple PUSCH transmissions. In some examples, the first and second PUSCH transmissions are phase coherent or phase continuous if the start phase of the radio wave used for the second PUSCH transmission is the same as the end phase of the radio wave used for the first PUSCH transmission. For example, the first and second PUSCH transmissions will be phase coherent or phase continuous if the phase difference between the first radio wave of the first PUSCH transmission and the second radio wave of the second PUSCH transmission is constant. Conversely, if the phase difference between the first radio wave transmitted in the first PUSCH transmission and the second radio wave transmitted in the second PUSCH transmission changes or is random, then the first PUSCH transmission and the second PUSCH transmission will not have phase coherence or phase continuity.

[0069] Variations in transmission parameters between two PUSCH transmissions can cause phase discontinuities (lack of phase coherence) between them. For example, if the UE uses different frequency resource allocations between the two PUSCH transmissions, uses different transmit powers for the two PUSCH transmissions, or uses different uplink beams to transmit the two PUSCH transmissions, and other examples, then the two PUSCH transmissions may be phase-incoherent with each other. As another example, if the two PUSCH transmissions are discontinuous in time resource allocation, then in some examples, the two PUSCH transmissions may be phase-incoherent with each other. For example, if there is a large (e.g., greater than a threshold) time gap between the two PUSCH transmissions, then the two PUSCH transmissions may be phase-incoherent with each other. For example, another uplink transmission (on another channel, such as a PUCCH transmission, or another reference signal, such as an SRS) may be transmitted between the two PUSCH transmissions (e.g., in a time gap), causing the two PUSCH transmissions to be phase-incoherent with each other. As another example, a downlink transmission (e.g., PDCCH transmission, PDSCH transmission, SSB, or CSI-RS) can be received between two PUSCH transmissions, causing the two PUSCH transmissions to be out of phase with each other.

[0070] In some examples, the base station may signal to the UE whether to apply DMRS binding to PUSCH transmissions (sometimes referred to as PUSCH DMRS binding), such as using Radio Resource Control (RRC) messages, DCI, or Media Access Control (MAC) control elements (CE) (collectively referred to as MAC-CE). In some examples, the base station may instruct the UE to apply DMRS binding to PUSCH transmissions that satisfy a set of conditions (e.g., one or more conditions). The set of conditions may involve whether the UE can maintain phase coherence across PUSCH transmissions, such as whether the PUSCH transmissions are transmitted using the same frequency resource allocation, whether they are transmitted using the same transmit power, whether they are transmitted using the same beam, or whether they are transmitted continuously in time (or within a threshold time amount, or without other interference with uplink transmission or downlink reception), and other examples. If both the UE and the base station can explicitly determine whether the set of conditions is satisfied, enabling DMRS binding via base station signaling can be used by the UE to determine when to apply PUSCH DMRS binding, and by the base station to determine when to perform joint channel estimation on PUSCHs using bound DMRS, and to explicitly apply these determinations to the same DMRS and the corresponding PUSCH transmissions.

[0071] However, in some scenarios, the base station cannot explicitly determine whether the set of conditions for PUSCH DMRS binding is met. For example, the UE determines the transmit power for uplink power control based at least in part on the path loss reference signal (PL-RS) measured by the UE. If the path loss value determined by the UE (at least in part based on the PL-RS) changes between two PUSCH transmissions, the UE can transmit those two PUSCH transmissions with different transmit powers. However, the base station may not receive information indicating a change in the UE's PL-RS measurement, the path loss value determined by the UE, or a change in the transmit power used by the UE. Therefore, when two PUSCH transmissions are actually out of phase (because the two PUSCH transmissions are transmitted using different transmit powers), the base station may assume that the two PUSCH transmissions are phase-coherent (and are transmitted using the same transmit power). This can lead to communication errors, inaccurate channel estimation by the base station, or the base station's inability to properly demodulate PUSCH transmissions, among other examples. As another example, a UE may send one or more uplink transmissions between two PUSCH transmissions (e.g., to another base station), receive one or more downlink transmissions between two PUSCH transmissions (e.g., from another base station), or send or receive one or more sidelink communications between two PUSCH transmissions (e.g., from another UE), which may disrupt the phase continuity between the two PUSCH transmissions. The base station may not receive information indicating such interfering communications and the resulting phase discontinuity between the two PUSCH transmissions, and may incorrectly assume phase coherence between the two PUSCH transmissions, leading to the errors and inefficiencies described above.

[0072] These aspects generally involve enabling the UE to indicate to the base station whether the UE can comply with a request from the base station to apply DMRS binding to uplink communications. Some aspects more specifically involve whether the UE can comply with the base station's indication of the DMRS binding request based at least in part on whether the UE can maintain phase coherence across multiple uplink communications (such as PUSCH communications or PUCCH communications). In some aspects, the UE can send an indication for PUSCH transmissions in a UCI multiplexed with PUSCH transmissions, which allows for implicit indication of PUSCH transmissions with applied coherence indication. In some aspects, the UE can use a DMRS sequence for DMRS to send the indication, and the DMRS sequence selected by the UE can indicate whether the UE can comply with the DMRS binding request.

[0073] Specific aspects of the subject matter described in this disclosure can be implemented to achieve one or more of the following potential advantages. In some examples, the described techniques can be used to provide a clear indication of whether different uplink transmissions are phase-coherent with each other. As a result, the base station can correctly determine when to perform joint channel estimation for uplink transmissions using multiple DMRSs, thereby improving the accuracy of channel estimation, reducing communication errors, and improving the demodulation of PUSCH transmissions. Furthermore, in some examples, the described techniques allow the base station to have some control over DMRS binding while increasing the flexibility of UE transmission and operation by enabling the UE to apply DMRS binding in a manner different from what the base station requests.

[0074] Figure 5 This is a diagram illustrating example 500 of different time slot modes according to this disclosure. A time slot mode may sometimes be referred to as TDD time slot mode, TDD mode, UL / DL time slot mode, UL / DL mode, TDD UL / DL time slot mode, or TDD UL / DL mode. For a time slot sequence, the time slot mode may indicate whether each time slot in the time slot sequence is configured as an uplink time slot or a downlink time slot (or, in some examples, a special time slot). Uplink time slots can be used for uplink communication (but not downlink communication), and downlink time slots can be used for downlink communication (but not uplink communication). Additionally or alternatively, the time slot mode may indicate whether the UE is configured for TDD or Frequency Division Duplex (FDD).

[0075] For example, Figure 5 The first time slot pattern 510 is shown, which has one uplink (U) time slot, followed by three downlink (D) time slots, followed by one uplink time slot, followed by three downlink time slots, followed by one uplink time slot, followed by three downlink time slots, followed by one uplink time slot, followed by three downlink time slots. Figure 5 A second timeslot mode 520 with thirteen consecutive uplink timeslots is also shown. The second timeslot mode 520 can be configured in, for example, an FDD system that uses a first frequency for uplink communication and a second (different) frequency for downlink communication. Figure 5 A third timeslot pattern 530 is also shown, which has two uplink timeslots, followed by three downlink timeslots, then two uplink timeslots, then three downlink timeslots, then two uplink timeslots, and then three downlink timeslots. These timeslot patterns are shown as examples, and other examples may differ from these timeslot patterns.

[0076] As shown, within time span 540, different UEs configured with these different time slot modes have different numbers of opportunities to send uplink communications (e.g., different numbers of transmission opportunities within the same time span 540), such as PUSCH or PUCCH communications. For example, a first UE configured with a first time slot mode 510 has four uplink transmission opportunities (labeled 0 to 3) within time span 540, a second UE configured with a second time slot mode 520 has thirteen uplink transmission opportunities (labeled 0 to 12) within time span 540, and a third UE configured with a third time slot mode 530 has six uplink transmission opportunities (labeled 0 to 5) within time span 540. Furthermore, the different uplink transmission opportunities can be separated by different time slots.

[0077] In some time-slot configurations, due to the high uplink time-slot density (e.g., in FDD time-slot mode where all uplink time slots can be used, or in TDD time-slot mode with a high uplink-to-downlink time-slot ratio), the UE can transmit a large number of uplink duplicates over a time span. In other time-slot configurations, due to the low uplink time-slot density (e.g., in TDD time-slot mode with a low uplink-to-downlink time-slot ratio), the UE can only transmit a small number of uplink duplicates over the same time span.

[0078] As described above Figure 4 As described, in order for the base station to perform joint channel estimation using multiple DMRS corresponding to multiple uplink communications, the UE must maintain phase coherence across those multiple uplink communications. When transmitting multiple uplink communications within a short time period, the UE is likely to maintain phase coherence compared to transmitting multiple uplink communications within a longer time period, because channel conditions are more likely to change within a longer time period, and downlink interruptions are more likely to occur within a longer time period, among other examples.

[0079] As described above, these aspects generally involve enabling the UE to indicate to the base station whether it can comply with a request from the base station to apply DMRS bindings to uplink communications. In some examples, the described techniques can be used to provide the base station with some control over DMRS bindings while increasing the UE's transmission and operational flexibility by enabling the UE to apply DMRS bindings in a manner different from what the base station requests. This allows the UE to take into account various UE-specific factors, such as the time slot pattern configured for the UE, when applying DMRS bindings.

[0080] Figure 6 This is a diagram illustrating an example 600 associated with indicating whether a UE applies DMRS binding, according to this disclosure. Figure 6As shown, base station 110 and UE 120 can communicate with each other. Although Example 600 is applicable to PUSCH transmission, some aspects described herein are applicable to PUCCH transmission.

[0081] like Figure 6 As shown, base station 110 may send request 605 to UE 120. Request 605 may request UE 120 to apply DMRS binding to uplink transmissions (sometimes referred to as uplink DMRS binding), such as PUSCH transmissions (sometimes referred to as PUSCHDMRS binding) or PUCCH transmissions (sometimes referred to as PUCCH DMRS binding). For example, request 605 may instruct UE 120 to enable uplink DMRS binding. In some aspects, UE 120 may send a capability report indicating that UE 120 is capable of uplink DMRS binding, and UE 120 may receive request 605 at least in part based on the capability report. Additionally or alternatively, UE 120 may send a capability report indicating that UE 120 is capable of supporting the transmission of instructions regarding whether UE is able to comply with the request for uplink DMRS binding (described in more detail below), and UE 120 may receive request 605 at least in part based on the capability report. If DMRS binding is applied to an uplink transport set, the UE must maintain phase coherence (or phase continuity) across the uplink transport set so that base station 110 can perform joint channel estimation across that uplink transport set, as described above. Figure 4 As described above. Figure 4 Additional details regarding uplink DMRS binding are described in more detail.

[0082] In some aspects, Request 605 may be sent in an RRC message (such as an RRC configuration message or an RRC reconfiguration message), in a DCI, or in a MAC-CE. For example, if Request 605 applies to a configuration grant uplink transport configured in an RRC message, then Request 605 may be included in the RRC message. Additionally or alternatively, Request 605 may be sent in a DCI, such as a dedicated DCI (e.g., one with a unique Radio Access Temporary Identifier (RNTI), such as a Binding Indication RNTI), an uplink grant, or a downlink grant, among other examples. For example, if Request 605 applies to a dynamically scheduled PUSCH transport, then Request 605 may be sent in a DCI that schedules the PUSCH transport (e.g., an uplink grant). As another example, if Request 605 applies to a PUCCH transport, then Request 605 may be sent in a DCI that schedules the PUCCH transport (e.g., a PDSCH grant).

[0083] In some aspects, request 605 may include an indication of a time period (shown as time period T) during which UE 120 intends to apply DMRS binding to uplink transmissions sent during that time period. Base station 110 may indicate this time period as, for example, an absolute time period (e.g., 5 milliseconds or 10 milliseconds, and other examples), a number of time slots (or another time-domain resource), or a number of uplink transmissions, and other examples. In some aspects, request 605 may refer to a periodic time period, such as authorized uplink transmissions for configuration or semi-persistent scheduling (SPS) uplink transmissions. In some aspects, request 605 includes a first field or information element (IE) indicating whether DMRS binding is applied to uplink transmissions, and a second field or IE indicating the time period during which DMRS binding will be applied. Therefore, base station 110 may send, and UE 120 may receive, request 505 indicating that DMRS binding is applied to uplink transmissions within the indicated time period.

[0084] like Figure 6 As further illustrated, UE 120 can send multiple PUSCH transmissions 610 to base station 110 over time (in different time-domain resources, such as time slots, micro-time slots, or symbols), shown as a first PUSCH transmission 610-1 (“PUSCH A”), a second PUSCH transmission 610-2 (“PUSCH B”), and a third PUSCH transmission 610-3 (“PUSCH C”). For example, UE 120 can send multiple PUSCH transmissions 610 during the time period T indicated in request 605. Although in Figure 6 The diagram illustrates the transmission of three PUSCH transmissions 610 during a time period T, but some aspects may include transmitting different numbers of PUSCH transmissions 610 during the time period T. As further shown, each PUSCH transmission 610 may be associated with a DMRS 615, shown as a first DMRS 615-1 (“DMRS A”) corresponding to PUSCH A, a second DMRS 615-2 (“DMRS B”) corresponding to PUSCH B, and a third DMRS 615-3 (“DMRS C”) corresponding to PUSCH C. In Example 600, DMRS 615 and the corresponding PUSCH transmissions 610 are transmitted in the same time slot, wherein DMRS 615 is transmitted in a subset of the resource elements of that time slot (such as according to DMRS configuration). For example, DMRS A and PUSCH A are transmitted in the first time slot, DMRS B and PUSCH B are transmitted in the second time slot, and DMRS C and PUSCH C are transmitted in the third time slot.

[0085] As shown, UE 120 can transmit UCI 620 associated with each PUSCH transmission 610, shown as a first UCI 620-1 (“UCI A”) corresponding to PUSCH A, a second UCI 620-2 (“UCI B”) corresponding to PUSCH B, and a third UCI 620-3 (“UCI C”) corresponding to PUSCH C. In some aspects, UCI 620 is multiplexed with the PUSCH transmission 610 involved in UCI 620 (e.g., the PUSCH transmission 610 to which the information carried in UCI 620 is to be applied). For example, in some aspects, PUSCH transmission 610 can be rate-matched around UCI 620. In some other aspects, PUSCH transmission 610 can be punctured with UCI 620.

[0086] As shown, UE 120 may send an indication of request 605 regarding whether UE 120 is able to comply with request 605 to apply DMRS binding to multiple transmitted PUSCH transmissions during time period T. In some aspects, whether UE 120 is able to comply with the indication of request 605 may be based at least in part on whether UE 120 is able to maintain phase coherence across multiple uplink transmissions. For example, if UE 120 is able to maintain phase coherence across multiple PUSCH transmissions, then UE 120 may send an indication that UE 120 is able to apply DMRS binding to those PUSCH transmissions. As another example, if UE 120 is unable to maintain phase coherence across multiple PUSCH transmissions, then UE 120 may send an indication that UE 120 is unable to apply DMRS binding to those PUSCH transmissions.

[0087] like Figure 6 As shown, in some aspects, UE 120 can send an indication of whether UE 120 is able to comply with request 605 in UCI 620. For example, if request 605 applies to a PUSCH transmission (but not a PUCCH transmission), UE 120 can send an indication in UCI 620 multiplexed with PUSCH transmission 610. Figure 6 In this context, the indicator is referred to as the "coherence indicator". Figure 6A first coherence indicator 625-1 (“Coherence Indicator A”) included in UCI A, a second coherence indicator 625-2 (“Coherence Indicator B”) included in UCI B, and a third coherence indicator 625-3 (“Coherence Indicator C”) included in UCI C are shown. The coherence indicator 625 can indicate whether a PUSCH transmission 610 corresponding to the coherence indicator 625 is coherent with one or more other PUSCH transmissions (e.g., has phase coherence or phase continuity). The PUSCH transmission 610 corresponding to the coherence indicator 625 is sometimes referred to herein as the “primary PUSCH transmission,” and one or more other PUSCH transmissions are sometimes referred to herein as “secondary PUSCH transmissions.” Thus, the coherence indicator 625 can indicate whether the primary PUSCH transmission (transmitted in conjunction with and in relation to the UCI 620 including the coherence indicator 625) has phase coherence with one or more secondary PUSCH transmissions (in addition to the primary PUSCH transmission). The coherence indicator can also be referred to as a “binding indicator.” In some aspects, the primary PUSCH transmission and the secondary PUSCH transmission are different PUSCH transmissions carrying different transport blocks (TBs). Additionally or alternatively, the primary PUSCH transmission and the secondary PUSCH transmission may be different repetitions of a particular PUSCH transmission (e.g., carrying the same TB). In some aspects, UE 120 may send a coherence indication at least in part based on a capability report stating that UE 120 supports a coherence indication for PUSCH DMRS binding. Additionally or alternatively, UE 120 may receive instructions from base station 110 (e.g., in configuration, RRC messages, DCI, or MAC-CE) to send a coherence indication for PUSCH DMRS binding, and UE 120 may send the coherence indication at least in part based on such instructions.

[0088] A coherence indicator may include one or more bits indicating that a secondary PUSCH transmission is coherent with the primary PUSCH transmission. In some aspects, the coherence indicator consists of only a single bit to save signaling overhead. In this example, a first value of the bit (e.g., 1) may indicate that the primary PUSCH transmission has phase continuity with one or more secondary PUSCH transmissions, and a second value of the bit (e.g., 0) may indicate that the primary PUSCH transmission does not have phase continuity with one or more secondary PUSCH transmissions.

[0089] The indication for a specific PUSCH transmission to which a coherence indicator is applied may be stored in the memory of UE 120 (e.g., at least in part based on a wireless communication standard) or may be signaled to UE 120 by base station 110 (e.g., in configuration, in DCI, or in MAC-CE). In some aspects, the coherence indicator is applied to a single PUSCH transmission that immediately precedes the main PUSCH transmission in the time domain. For example, the coherence indicator may be applied to a previous PUSCH transmission that occurs before (e.g., immediately before) the main PUSCH transmission (e.g., during a previous PUSCH transmission before the main PUSCH transmission, without any intervention from UE 120). In this example, when the coherence indicator is a single bit, a first value of the single bit may indicate that the main PUSCH transmission is coherent with the previous PUSCH transmission, and a second value of the bit may indicate that the main PUSCH transmission is incoherent with the previous PUSCH transmission. When the coherence indication is applied to PUSCH transmissions that occur before the main PUSCH transmission, this increases the flexibility of UE 120 (compared to when the coherence indication is applied to PUSCH transmissions that occur after the main PUSCH transmission), because UE 120 does not need to commit to maintaining phase continuity for future PUSCH transmissions.

[0090] In some aspects, coherence indication applies to a single PUSCH transmission that immediately follows the primary PUSCH transmission in the time domain. For example, coherence indication can be applied to the next PUSCH transmission that occurs after (e.g., immediately after) the primary PUSCH transmission (e.g., the next PUSCH transmission following the primary PUSCH transmission without any intervention from UE 120). In this example, when the coherence indication is a single bit, a first value of the single bit can indicate that the primary PUSCH transmission is coherent with the next PUSCH transmission, and a second value of the bit can indicate that the primary PUSCH transmission is incoherent with the next PUSCH transmission. When coherence indication is applied to a PUSCH transmission that occurs after the primary PUSCH transmission, this reduces the decoding complexity of base station 110 (compared to when coherence indication is applied to a PUSCH transmission that occurs before the primary PUSCH transmission) because base station 110 will not need to perform two channel estimations. For example, if a coherence indication is applied to a PUSCH transmission occurring prior to a main PUSCH transmission, base station 110 might need to perform a first channel estimation to decode the UCI, determining at least in part based on the coherence indication in the UCI whether to perform joint estimation of the PUSCH in conjunction with the previous PUSCH transmission, and then perform a second channel estimation to decode the PUSCH transmission (e.g., jointly or separately, depending on the coherence indication). However, performing two channel estimations is simpler than not having a coherence indication, which would require performing two channel estimations for the PUSCH transmission (separate channel estimation and joint channel estimation), and two decodings for the PUSCH transmission (using separate channel estimation and joint channel estimation) (and any accompanying UCI, if present).

[0091] In some aspects, coherence indication is applied to a set of (one or more) PUSCH transmissions occurring within a time window (e.g., time period T). The indication defining the time window may be stored in the memory of UE 120 (e.g., at least in part based on a wireless communication standard) or may be signaled to UE 120 by base station 110 (e.g., in configuration, DCI, or MAC-CE). In some aspects, the time window may be indicated by an offset, periodicity, or both. In some aspects, the time window is defined with respect to a primary PUSCH transmission or a UCI multiplexed with a primary PUSCH transmission. For example, the primary PUSCH transmission or UCI may define the start of the time window (e.g., the start of the time window may be the initial symbol or the final symbol of the primary PUSCH transmission or UCI), and the time window may have a length defined by the number of time-domain resources following the primary PUSCH transmission or UCI, such as the number of symbols, the number of micro-slots, or the number of slots, among other examples. As another example, the primary PUSCH transmission or UCI may define the end of a time window (e.g., the end of the time window may be the initial symbol or the final symbol of the primary PUSCH transmission or UCI), and the time window may have a length defined by the amount of time-domain resources preceding the primary PUSCH transmission or UCI. As another example, the primary PUSCH transmission or UCI may occur within a time window (e.g., neither at the beginning nor the end of the time window), and the time window may have a length defined by a first amount of time-domain resources preceding the primary PUSCH transmission or UCI and a second amount of time-domain resources following the primary PUSCH transmission or UCI. The first and second amounts may be the same or different. In this example, when the coherence indication is a single bit, the first value of the single bit may indicate that the primary PUSCH transmission is coherent with all (sub) PUSCH transmissions occurring within the time window, and the second value of the bit may indicate that the primary PUSCH transmission is incoherent with all (sub) PUSCH transmissions occurring within the time window.

[0092] In some aspects, the coherence indication comprises multiple bits. In this example, each bit (of the multiple bits) may correspond to a different secondary PUSCH transmission, and the value of the bit may indicate whether the primary PUSCH transmission is phase-coherent with the secondary PUSCH transmission corresponding to that bit. For example, a coherence indication bit string of "101" may indicate that the primary PUSCH transmission is phase-coherent with the first PUSCH transmission (corresponding to the first "1"), not phase-coherent with the second PUSCH transmission (corresponding to the first "0"), and phase-coherent with the third PUSCH transmission (corresponding to the second "1"). In some aspects, the order of the bits in the bit string may correspond to the order in which the secondary PUSCH transmissions occur in the time domain. In some aspects, the initial bits in the bit string may correspond to a PUSCH transmission that occurs immediately after the primary PUSCH transmission (and, for example, all bits correspond to a PUSCH transmission that occurs after the primary PUSCH transmission). Alternatively, the last bit in the bit string may correspond to a PUSCH transmission that occurs immediately before the main PUSCH transmission (and, for example, all bits may correspond to a PUSCH transmission that occurs before the main PUSCH transmission). Alternatively, one or more bits in the bit string may correspond to one or more PUSCH transmissions that occur before the main PUSCH transmission, and one or more other bits in the bit string may correspond to one or more PUSCH transmissions that occur after the main PUSCH transmission.

[0093] In some aspects, coherence indicators can be applied to absolutely preceding PUSCH transmissions (PUSCH transmissions without interfering PUSCH transmissions from the primary PUSCH transmission), absolutely subsequent PUSCH transmissions (PUSCH transmissions without interfering PUSCH transmissions from the primary PUSCH transmission), or all PUSCH transmissions within a time window, regardless of the transmission parameters associated with those PUSCH transmissions. Alternatively, coherence indicators can be applied to preceding PUSCH transmissions that satisfy a set of conditions (e.g., PUSCH transmissions that occurred before the primary PUSCH transmission in time and satisfy that set of conditions), subsequent PUSCH transmissions that satisfy the set of conditions (e.g., PUSCH transmissions that occurred after the primary PUSCH transmission in time and satisfy that set of conditions), or PUSCH transmissions within a time window that satisfy the set of conditions only. One or more of the condition sets can relate to whether the transmission parameters of a secondary PUSCH transmission are the same as the corresponding transmission parameters of the primary PUSCH transmission. Transmission parameters can include, for example, resource block (RB) allocation, uplink beamforming, transmit power, or precoder (e.g., precoding matrix). For example, coherence indication can be applied to the following secondary PUSCH transmissions: having the same RB allocation as the primary PUSCH transmission, transmitting on the same uplink beam as the primary PUSCH transmission, transmitting at the same transmit power as the primary PUSCH transmission, having the same precoding as the primary PUSCH transmission (e.g., transmitting using the same precoder), or a combination thereof.

[0094] In some aspects, the absolute value of a bit in a coherence indicator can indicate whether a corresponding secondary PUSCH transmission is coherent with the primary PUSCH transmission (e.g., independent of bit values ​​in any other coherence indicator). In this example, a first bit value (e.g., 1) can indicate that the primary and secondary PUSCH transmissions have phase continuity, and a second bit value (e.g., 0) can indicate that the primary and secondary PUSCH transmissions do not have phase continuity, independent of bit values ​​in any other coherence indicator.

[0095] Alternatively, the relative value of a bit in the coherence indicator to a bit value in another coherence indicator can indicate whether the corresponding secondary PUSCH transmission is coherent with the primary PUSCH transmission. In this example, the bit value is used to indicate the switching of phase coherence. For example, if the bit value in the coherence indicator of the primary PUSCH transmission is the same as the bit value in a previous (or subsequent) coherence indicator associated with the secondary PUSCH transmission, this can indicate that the primary PUSCH transmission is coherent with the secondary PUSCH transmission. Conversely, if the bit value in the coherence indicator of the primary PUSCH transmission is different from the bit value in a previous (or subsequent) coherence indicator associated with the secondary PUSCH transmission, this can indicate that the primary PUSCH transmission is incoherent with the secondary PUSCH transmission.

[0096] In some aspects, if the UCI multiplexed with the primary PUSCH transmission contains a hybrid Automatic Repeat Request Acknowledgment (HARQ-ACK) message, Channel State Information (CSI), or Scheduling Request (SR), the UE 120 can attach the coherence indication of the primary PUSCH transmission to the HARQ-ACK message, CSI, or SR to save signaling overhead. If the UCI multiplexed with the primary PUSCH transmission does not contain HARQ-ACK message, CSI, or SR, the UE 120 can independently transmit the coherence indication for the primary PUSCH transmission within the UCI multiplexed with the primary PUSCH transmission (e.g., the UCI may contain only the coherence indication without any other information).

[0097] In some aspects, UE 120 may send a message in association with each uplink transmission indicated by request 605 (e.g., including each uplink transmission in time period T) indicating whether UE 120 is able to comply with the indication of request 605. For example, in Figure 6 In this process, a coherence indication 625 is sent in each UCI 620 corresponding to each PUSCH transmission 610. Thus, the indication can be sent in association with each primary uplink transmission indicated by request 605, regardless of whether UE 120 is able to comply with request 605 (e.g., regardless of whether UE 120 is able to maintain phase coherence between the primary uplink transmission and one or more secondary uplink transmissions).

[0098] Alternatively, UE 120 may send an indication of whether it is able to comply with request 605 only when UE 120 cannot comply with request 605 (e.g., only when UE 120 cannot maintain phase coherence). For example, if UE 120 determines that it cannot maintain phase coherence between a primary uplink transmission and one or more secondary uplink transmissions (e.g., a previous uplink transmission or a next uplink transmission), UE 120 may send an indication of its inability to maintain phase coherence of the primary uplink transmission in association with the primary uplink transmission (e.g., in a UCI multiplexed with the primary uplink transmission). If UE 120 determines that it can maintain phase coherence between the primary uplink transmission and one or more secondary uplink transmissions (e.g., the previous uplink transmission or the next uplink transmission), then UE 120 can avoid sending an explicit indication of its ability to maintain phase coherence of the primary uplink transmission in association with the primary uplink transmission (e.g., in a UCI multiplexed with the primary uplink transmission). If no explicit indication for the primary uplink transmission exists, this can implicitly indicate to base station 110 that UE 120 can maintain phase coherence of the primary uplink transmission, while reducing signaling overhead.

[0099] like Figure 6 As further shown, in operation 630, base station 110 can perform joint channel estimation or separate channel estimation at least in part based on whether UE 120 is able to comply with the indication of request 605. For example, if the indication indicates that the primary PUSCH transmission is coherent with the secondary PUSCH transmission, base station 110 can perform joint channel estimation for the primary PUSCH transmission and the secondary PUSCH transmission (or a set of secondary PUSCH transmissions, depending on one or more coherence indications). Conversely, if the indication indicates that the primary PUSCH transmission is incoherent with the secondary PUSCH transmission, base station 110 can perform separate joint channel estimation for the primary PUSCH transmission independently of the channel estimation performed for the secondary PUSCH transmission. Therefore, base station 110 can determine whether to perform separate channel estimation or joint channel estimation for the primary PUSCH transmission based at least in part on the coherence indication. Furthermore, if base station 110 determines to perform joint channel estimation on the primary PUSCH transmission, base station 110 may determine, at least in part, which secondary PUSCH transmissions are coherent with the primary PUSCH transmission to perform joint channel estimation based on coherence indications associated with the primary PUSCH transmission (and in some respects, one or more other coherence indications).

[0100] By enabling UE 120 to indicate or control PUSCH DMRS binding using an indication of whether UE 120 can comply with a DMRS binding request sent by base station 110, the techniques and apparatus described herein can be used to provide a clear indication of whether different PUSCH transmissions are phase-coherent with each other. As a result, base station 110 can correctly determine when to perform joint channel estimation for PUSCH transmissions using multiple DMRS, thereby improving the accuracy of channel estimation, reducing communication errors, and improving the demodulation of PUSCH transmissions. Furthermore, the techniques described herein allow base station 110 to instruct UE 120 on which uplink transmissions to apply DMRS binding, while allowing UE 120 the flexibility to modify those instructions.

[0101] In some aspects, DMRS binding can be performed during a random access channel (RACH) procedure (such as a 2-step RACH procedure or a 4-step RACH procedure). For example, base station 110 may send a request in a RACH message (e.g., a downlink RACH message, such as a random access response or Msg2 in a 4-step RACH procedure). UE 120 may apply DMRS binding to PUSCH communications, which are sent by UE 120 as part of a RACH procedure, at least in part based on this request. For example, UE 120 may send multiple uplink communications (e.g., multiple PUSCH communications) as part of a RACH message (e.g., an uplink RACH message, such as Msg3 in a 4-step RACH procedure). As described herein, UE 120 may apply DMRS binding to these multiple uplink communications. Additionally or alternatively, UE 120 may send an indication of whether the UE is able to comply with the request for multiple uplink communications, as further described herein.

[0102] As described herein, in some aspects, UE 120 may send an indication of whether UE can comply with requests for multiple uplink communications based at least in part on whether UE 120 can maintain phase coherence across multiple uplink transmissions. Similarly, in some aspects, UE 120 may send an indication of whether UE can comply with requests for multiple uplink communications based at least in part on whether UE 120 can maintain power consistency and / or phase continuity to comply with power consistency and / or phase continuity requirements.

[0103] Figure 7 This is a diagram illustrating example 700 associated with indicating whether a UE has applied DMRS binding, according to this disclosure. Figure 7 As shown, base station 110 and UE 120 can communicate with each other. Although Example 700 is described in conjunction with PUSCH transmission, in conjunction with... Figure 7 The described technology can also be applied to PUCCH transmission.

[0104] like Figure 7 As shown, base station 110 can be connected with the above Figure 6 The request 705 is sent to UE 120 in a similar manner to that described above. Request 705 may request UE 120 to apply DMRS binding to uplink transmissions (sometimes called uplink DMRS binding), such as PUSCH transmissions (sometimes called PUSCH DMRS binding) or PUCCH transmissions (sometimes called PUCCH DMRS binding), as described above. Figure 6 A more detailed description.

[0105] like Figure 7As further shown, UE 120 can send multiple PUSCH transmissions 710 to base station 110 over time (in different time-domain resources, such as time slots, micro-time slots, or symbols), shown as first PUSCH transmission 710-1 (“PUSCH A”), second PUSCH transmission 710-2 (“PUSCH B”), and third PUSCH transmission 710-3 (“PUSCH C”), as described above. Figure 6 A more detailed description. Although Figure 7 It describes whether UE 120 can comply with the instructions of Request 705 regarding DMRS binding for PUSCH transmission, but in conjunction with Figure 7 The described techniques can be applied additionally or alternatively to PUCCH transmission.

[0106] As further illustrated, each PUSCH transmission 710 may be associated with a DMRS 715, which is shown as a first DMRS 715-1 (“DMRS A”) corresponding to PUSCH A, a second DMRS 715-2 (“DMRS B”) corresponding to PUSCH B, and a third DMRS 715-3 (“DMRS C”) corresponding to PUSCH C. In Example 700, the DMRS 715 and the corresponding PUSCH transmission 710 are transmitted in the same time slot, where the DMRS 715 is transmitted in the resource elements (such as according to the DMRS configuration) of that time slot. For example, DMRS A and PUSCH A are transmitted in the first time slot, DMRS B and PUSCH B are transmitted in the second time slot, and DMRS C and PUSCH C are transmitted in the third time slot.

[0107] As shown, UE 120 may send an indication of request 705 regarding whether UE 120 is able to comply with request 705 to apply DMRS binding to multiple transmitted PUSCH transmissions during time period T. In some aspects, whether UE 120 is able to comply with the indication of request 705 may be based at least in part on whether UE 120 is able to maintain phase coherence across multiple uplink transmissions. For example, if UE 120 is able to maintain phase coherence across multiple PUSCH transmissions, then UE 120 may send an indication that UE 120 is able to apply DMRS binding to those PUSCH transmissions. As another example, if UE 120 is unable to maintain phase coherence across multiple PUSCH transmissions, then UE 120 may send an indication that UE 120 is unable to apply DMRS binding to those PUSCH transmissions.

[0108] like Figure 7As shown, in some aspects, UE 120 may send a specific DMRS sequence to indicate whether UE 120 is able to comply with request 705. In some aspects, the DMRS sequence may be a Zadoff-Chu sequence. A Zadoff-Chu sequence is a complex-valued mathematical sequence that, when applied to a signal, generates a new signal with a constant amplitude. In some aspects, UE 120 may determine (e.g., may identify, select, or generate) a DMRS sequence to indicate whether a PUSCH transmission 710 corresponding to a DMRS 715 for which a DMRS sequence has been determined is coherent (e.g., has phase coherence or phase continuity) with one or more other PUSCH transmissions. The PUSCH transmission 710 corresponding to DMRS 715 or the DMRS sequence is sometimes referred to herein as a “primary PUSCH transmission,” and one or more other PUSCH transmissions are sometimes referred to herein as “secondary PUSCH transmissions.” Therefore, the DMRS sequence can indicate whether the primary PUSCH transmission (which is transmitted in conjunction with and in connection with the DMRS 715 transmitted using the DMRS sequence) is phase coherent with one or more secondary PUSCH transmissions (in addition to the primary PUSCH transmission).

[0109] In some aspects, a specific DMRS sequence transmitted in conjunction with the primary PUSCH transmission can indicate whether the UE 120 is able to comply with request 705 for that primary PUSCH transmission. For example, a specific DMRS sequence transmitted in conjunction with the primary PUSCH transmission can indicate whether the UE 120 is able to maintain phase coherence across the primary PUSCH transmission and one or more secondary PUSCH transmissions. For example, if the UE 120 is able to maintain phase coherence across the primary PUSCH transmission and one or more secondary PUSCH transmissions, then the UE 120 may transmit a first DMRS sequence (shown as DMRS sequence 1) related to the primary PUSCH transmission. As another example, if the UE 120 is unable to maintain phase coherence across the primary PUSCH transmission and one or more secondary PUSCH transmissions, then the UE 120 may transmit a second (different) DMRS sequence (shown as DMRS sequence 2) related to the primary PUSCH transmission. Therefore, the first DMRS sequence can indicate that UE 120 is able to comply with request 705 and maintain phase coherence, and the second DMRS sequence can indicate that UE 120 is unable to comply with request 705 and cannot maintain phase coherence.

[0110] UE 120 can use a sequence to initialize a seed or an initialization value (e.g., c). initThe UE 120 generates the DMRS sequence using a formula that includes multiple parameters. In some aspects, the formula may include parameters indicating whether the UE 120 can maintain phase coherence. For example, when generating the sequence initialization seed for a DMRS sequence corresponding to a primary PUSCH transmission, the UE 120 may apply a formula that includes parameters indicating whether the UE 120 can maintain phase coherence across primary PUSCH transmissions and one or more secondary PUSCH transmissions. Therefore, the value of the sequence initialization seed and the resulting DMRS sequence may differ depending on whether the UE 120 can maintain phase coherence.

[0111] A coherence indicator may include one or more bits indicating that a secondary PUSCH transmission is coherent with the primary PUSCH transmission. In some aspects, the coherence indicator consists of only a single bit to save signaling overhead. In this example, a first value of the bit (e.g., 1) may indicate that the primary PUSCH transmission has phase continuity with one or more secondary PUSCH transmissions, and a second value of the bit (e.g., 0) may indicate that the primary PUSCH transmission does not have phase continuity with one or more secondary PUSCH transmissions.

[0112] In some respects, the absolute value (e.g., a complex value) of the DMRS sequence can indicate whether the UE 120 is able to maintain phase coherence. For example, if the UE 120 is able to maintain phase coherence, the UE 120 can transmit a first DMRS sequence, and if the UE 120 is unable to maintain phase coherence, it can transmit a second DMRS sequence.

[0113] Alternatively, the relative value of the DMRS sequence compared to one or more other transmitted DMRS sequences can indicate whether the UE 120 is able to maintain phase coherence. This technique is sometimes referred to herein as "DMRS sequence switching." For example, the UE 120 may transmit a first DMRS sequence for an initial PUSCH transmission and may continue to transmit the first DMRS sequence for other PUSCH transmissions that are phase coherent with the initial PUSCH transmission. When the UE 120 cannot maintain phase coherence with a particular PUSCH transmission, the UE 120 may transmit a second DMRS sequence for that particular PUSCH transmission. For subsequent PUSCH transmissions following the particular PUSCH transmission, if those subsequent PUSCH transmissions are phase coherent with the particular PUSCH transmission, the UE 120 may continue to transmit the second DMRS sequence (e.g., instead of transmitting the first DMRS sequence to indicate phase coherence, the UE 120 will do so if the absolute value of the DMRS sequence indicates whether the UE 120 is able to maintain phase coherence). Therefore, in some respects, UE 120 can use the same DMRS sequence to indicate phase coherence across multiple consecutive PUSCH transmissions, and can switch to different DMRS sequences to indicate a lack of phase coherence.

[0114] In some aspects, UE 120 may store (in UE 120's memory) or be configured with a DMRS sequence pool. In some aspects, the pool may include at least three DMRS sequences. When UE 120 applies the DMRS handover technique described above, UE 120 may select a first DMRS sequence in the pool (e.g., DMRS sequence 1 in pool {1,2,3}) and may use the first DMRS sequence until phase continuity cannot be maintained. At this point, UE 120 may select a second DMRS sequence in the pool (e.g., DMRS sequence 2 in pool {1,2,3}) and may use the second DMRS sequence until phase continuity cannot be maintained. At this point, UE 120 may select a third DMRS sequence in the pool (e.g., DMRS sequence 3 in pool {1,2,3}) and may use the third DMRS sequence until phase continuity cannot be maintained. When UE 120 reaches the last DMRS sequence in the pool, UE 120 may cycle back to the first DMRS sequence in the pool and repeat the process. Compared to using only two DMRS sequences, this can improve the decoding performance of base station 110, as shown below. Figure 8 A more detailed description.

[0115] Despite the combination Figure 7 The described technique uses DMRS sequences to indicate whether UE 120 can comply with request 705 and whether UE 120 can maintain phase coherence, but in some aspects, it combines... Figure 7The described techniques may use DMRS ports in place of or as a supplement to DMRS sequences. For example, UE 120 may transmit DMRS 715 on a specific DMRS port to indicate phase coherence or phase incoherence in relation to the PUSCH transmission 710 corresponding to that DMRS 715. In some aspects, UE 120 may transmit DMRS 715 on a first DMRS port to indicate phase coherence and on a second DMRS port to indicate a lack of phase coherence. Alternatively, UE 120 may switch between DMRS ports in a manner similar to that described in conjunction with DMRS sequences, or may select DMRS ports from a pool of DMRS ports to indicate phase coherence or a lack of phase coherence. In some aspects, UE 120 may transmit the same DMRS sequence regardless of the DMRS port used. In some aspects, UE 120 may transmit different DMRS sequences on different DMRS ports to provide a clearer distinction. Generally, UE 120 may use one or more DMRS resources (e.g., DMRS sequence, DMRS port, other DMRS transmission parameters or combinations thereof) to indicate phase coherence or lack thereof in a manner similar to that described herein in conjunction with DMRS sequences.

[0116] As mentioned above Figure 6 As described, the indication sent using the DMRS sequence can be applied to a single PUSCH transmission in the time domain immediately preceding the main PUSCH transmission, can be applied to a single PUSCH transmission in the time domain immediately following the main PUSCH transmission, or can be applied to a set of (one or more) PUSCH transmissions occurring within a time window (e.g., time period T). Also, as described above... Figure 6 As described, the indication to be sent using DMRS sequence can be applied to absolutely preceding PUSCH transmissions (PUSCH transmissions without interfering PUSCH transmissions from the primary PUSCH transmission), absolutely subsequent PUSCH transmissions (PUSCH transmissions without interfering PUSCH transmissions from the primary PUSCH transmission), or all PUSCH transmissions within a time window, regardless of the transmission parameters associated with these PUSCH transmissions. Alternatively, the indication to be sent using DMRS sequence can be applied to previous PUSCH transmissions that satisfy a set of conditions (e.g., PUSCH transmissions that occurred before the primary PUSCH transmission in time and satisfy that set of conditions), subsequent PUSCH transmissions that satisfy a set of conditions (e.g., PUSCH transmissions that were closest to the primary PUSCH transmission in time and satisfy that set of conditions), or PUSCH transmissions within a time window that satisfy only the set of conditions.

[0117] like Figure 7As further shown, in operation 720, base station 110 can perform joint channel estimation or separate channel estimation at least in part based on whether UE 120 is able to comply with the indication of request 705. For example, if the indication indicates that the primary PUSCH transmission is coherent with the secondary PUSCH transmission, base station 110 can perform joint channel estimation for the primary PUSCH transmission and the secondary PUSCH transmission (or a set of secondary PUSCH transmissions, depending on one or more coherence indications). Conversely, if the indication indicates that the primary PUSCH transmission is incoherent with the secondary PUSCH transmission, base station 110 can perform separate joint channel estimation for the primary PUSCH transmission independently of the channel estimation performed for the secondary PUSCH transmission. Therefore, base station 110 can determine whether to perform separate channel estimation or joint channel estimation for the primary PUSCH transmission based at least in part on the coherence indication. Furthermore, if base station 110 determines to perform joint channel estimation on the primary PUSCH transmission, base station 110 can determine, at least in part, which secondary PUSCH transmissions are coherent with the primary PUSCH transmission based on coherence indications associated with the primary PUSCH transmission (and in some aspects, one or more other coherence indications) to perform joint channel estimation. In some aspects, base station 110 may use correlation or another technique to detect the transmitted DMRS sequence.

[0118] By enabling UE 120 to indicate or control PUSCH DMRS binding using an indication of whether UE 120 can comply with a DMRS binding request sent by base station 110, the techniques and apparatus described herein can be used to provide a clear indication of whether different PUSCH transmissions are phase-coherent with each other. As a result, base station 110 can correctly determine when to perform joint channel estimation for PUSCH transmissions using multiple DMRS, thereby improving the accuracy of channel estimation, reducing communication errors, and improving the demodulation of PUSCH transmissions. Furthermore, the techniques described herein allow base station 110 to instruct UE 120 on which uplink transmissions to apply DMRS binding, while allowing UE 120 the flexibility to modify those instructions.

[0119] Figure 8 This is a diagram illustrating Example 800 associated with indicating whether a UE has applied DMRS binding according to this disclosure. Although Example 800 is described in conjunction with PUSCH transmission, it is combined with... Figure 8 The described technology can also be applied to PUCCH transmission.

[0120] In operation 805, base station 110 may send a DMRS binding request to UE 120, which indicates the set of PUSCH transmissions to which DMRS binding is to be applied (e.g., a set of PUSCH transmissions within a time period). In example 800, the set of PUSCH transmissions includes PUSCH D, PUSCH E, PUSCH F, PUSCH G, PUSCH H, and PUSCH I. Base station 110 may request UE 120 to apply DMRS binding to all of these PUSCH transmissions. However, UE 120 may not comply with this request because UE 120 may not be able to maintain phase coherence across all of these PUSCH transmissions.

[0121] In operation 810, UE 120 may send one or more indications regarding whether UE 120 is able to comply with the request. For example, UE 120 may send one or more indications regarding whether UE 120 is able to maintain phase coherence across different PUSCH transmissions included in the PUSCH transmission set. In example 800, UE 120 uses a DMRS sequence to indicate whether UE 120 is able to comply with the request.

[0122] For example, UE 120 transmits the same DMRS sequence related to PUSCH D, PUSCH E, and PUSCH F, denoted as PUSCHDMRS sequence 1. By transmitting the same DMRS sequence for PUSCH D, PUSCH E, and PUSCH F, UE 120 indicates that PUSCH D, PUSCH E, and PUSCH F are phase coherent with each other. UE 120 then transmits a different DMRS sequence related to PUSCH G, denoted as PUSCH DMRS sequence 2, to indicate that PUSCH G is phase incoherent with PUSCH D, PUSCH E, and PUSCH F. UE 120 then again combines PUSCH H and transmits PUSCH DMRS sequence 2 to indicate that PUSCH H is phase coherent with PUSCH G. UE 120 then switches back to DMRS sequence 1 and combines it with PUSCH I to transmit DMRS sequence 1 to indicate that PUSCH I is phase incoherent with PUSCH H and PUSCH G. Furthermore, PUSCH I is unrelated to PUSCH D, PUSCH E, and PUSCH F.

[0123] In some aspects, instead of reusing PUSCH DMRS sequence 1 for PUSCH I, UE 120 may send a third DMRS sequence (e.g., PUSCH DMRS sequence 3) for PUSCH I to indicate that PUSCH I is phase-incoherent with PUSCH G and PUSCH H. In this example, if base station 110 fails to receive the DMRS associated with PUSCH G and PUSCH H, base station 110 will not incorrectly determine that PUSCH I is phase-coherent with PUSCH D, PUSCH E, and PUSCH F.

[0124] Figure 9 This is an illustration of Example 900, as described in this disclosure, associated with indicating whether a UE has applied DMRS binding. In operation 905, base station 110 may send a DMRS binding request to UE 120, indicating a set of PUSCH transmissions (e.g., a set of PUSCH transmissions within a time period) to which DMRS binding is to be applied. In Example 900, the set of PUSCH transmissions includes PUSCH D, PUSCH E, PUSCH F, PUSCH G, PUSCH H, and PUSCH I. Base station 110 may request UE 120 to apply DMRS binding to all of these PUSCH transmissions. However, UE 120 may not comply with this request because UE 120 may not be able to maintain phase coherence across all of these PUSCH transmissions.

[0125] In operation 910, UE 120 may send one or more indications regarding whether UE 120 is able to comply with the request. In example 900, UE 120 sends an indication regarding whether UE 120 is able to comply with the request only if UE 120 is unable to comply (e.g., only if UE 120 is unable to maintain phase coherence). For example, if UE 120 determines that it cannot maintain phase coherence between a primary uplink transmission and one or more secondary uplink transmissions (e.g., a previous uplink transmission or a next uplink transmission), UE 120 sends an indication that it cannot maintain phase coherence of the primary uplink transmission in association with the primary uplink transmission (e.g., in a UCI multiplexed with the primary uplink transmission). If UE 120 determines that it can maintain phase coherence between the primary uplink transmission and one or more secondary uplink transmissions (e.g., the previous uplink transmission or the next uplink transmission), then UE 120 avoids sending an explicit indication of its ability to maintain phase coherence of the primary uplink transmission in association with the primary uplink transmission (e.g., in a UCI multiplexed with the primary uplink transmission). If no explicit indication for the primary uplink transmission exists, this can implicitly indicate to base station 110 that UE 120 can maintain phase coherence of the primary uplink transmission, while reducing signaling overhead.

[0126] For example, UE 120 transmits PUSCH D, PUSCH E, and PUSCH F without transmitting a coherence indication in the UCI multiplexed with these PUSCHs. By transmitting PUSCH D, PUSCH E, and PUSCH F without a coherence indication in the corresponding UCI, UE 120 indicates that PUSCH D, PUSCH E, and PUSCH are phase-coherent with each other. UE 120 then transmits a UCI with a coherence indication associated with PUSCH G (indicated by a value of 0) to indicate that PUSCH G is phase-independent with PUSCH D, PUSCH E, and PUSCH F. UE 120 then transmits PUSCH H without a coherence indication in the UCI multiplexed with PUSCH H to indicate that PUSCH H is phase-coherent with PUSCH G. UE 120 then transmits a UCI with a coherence indication associated with PUSCH I (indicated by a value of 0) to indicate that PUSCH I is phase-independent with PUSCH H and PUSCH G. Furthermore, PUSCH I is unrelated to PUSCH D, PUSCH E, and PUSCH F.

[0127] Figure 10This is a flowchart illustrating an example procedure 1000 performed by a UE according to this disclosure. Example procedure 1000 is an example in which a UE (e.g., UE 120) performs an operation associated with indicating whether the UE has applied DMRS binding.

[0128] like Figure 10 As shown, in some aspects, process 1000 may include receiving a request to apply DMRS binding to uplink transmissions (box 1010). For example, a UE (such as by using...) Figure 12 The receiving component 1202 depicted can receive a request to apply DMRS binding to uplink transmissions, as described above. In some aspects, the UE can receive a request to apply DMRS binding within an indicated time period. Additionally, or alternatively, the UE can receive a request to apply DMRS binding by maintaining phase coherence across multiple uplink transmissions (e.g., to be transmitted during the indicated time period) to achieve joint channel estimation across multiple uplink transmissions.

[0129] like Figure 10 As further shown, in some aspects, process 1000 may include sending multiple uplink transmissions (block 1020). For example, a UE (such as by using...) Figure 12 The transmitting component 1206 depicted can transmit multiple uplink transmissions, as described above. In some aspects, the UE can transmit multiple uplink transmissions during an indicated time period.

[0130] like Figure 10 Further shown, in some aspects, process 1000 may include sending an indication of whether the UE can comply with a request, at least in part, based on whether the UE can transmit maintain phase coherence across multiple uplinks (box 1030). For example, the UE (such as by using...) Figure 12 The transmitting component 1206 described herein may transmit an indication of whether the UE can comply with the request, at least in part, based on whether the UE can maintain phase coherence across multiple uplink transmissions, as described above. In some aspects, the UE may transmit an indication of whether the UE can comply with the request, at least in part, based on whether the UE can maintain phase coherence across multiple uplink transmissions transmitted during the indicated time period.

[0131] Process 1000 may include additional aspects, such as any single aspect or any combination of aspects of one or more other processes described below or elsewhere herein.

[0132] In the first additional aspect, the multiple uplink transmissions are multiple PUSCH transmissions, and indicating whether the UE can comply with the request includes sending an indication in a UCI multiplexed with the multiple PUSCH transmissions (e.g., transmitted during the indicated time period).

[0133] In the second additional aspect, either alone or in combination with the first aspect, whether the UE is able to comply with the requested indication consists of a single bit in the UCI, which indicates whether the UE is able to maintain phase coherence across PUSCH transmissions and one or more other PUSCH transmissions included in a plurality of PUSCH transmissions (e.g., transmitted during the indicated time period).

[0134] In the third additional aspect, either alone or in combination with one or more of the first and second aspects, transmitting an indication of whether the UE is able to comply with the request includes: transmitting a specific DMRS sequence associated with an uplink transmission among a plurality of uplink transmissions (e.g., transmitted during an indicated time period), wherein the specific DMRS sequence indicates whether the UE is able to maintain phase coherence across uplink transmissions and one or more other uplink transmissions included among the plurality of uplink transmissions (e.g., transmitted during a specified time period).

[0135] In the fourth additional aspect, either alone or in combination with one or more of the first to third aspects, a particular DMRS sequence is one of the following: a first DMRS sequence indicating that the UE can maintain phase coherence across uplink transmissions and one or more other uplink transmissions, or a second DMRS sequence indicating that the UE cannot maintain phase coherence across uplink transmissions and one or more other uplink transmissions.

[0136] In the fifth additional aspect, either alone or in combination with one or more of the first to fourth aspects, process 1000 includes: determining a particular DMRS sequence based at least in part on a formula for sequence initialization seed, the formula including parameters indicating whether the UE is able to maintain phase coherence across uplink transmissions and one or more other uplink transmissions.

[0137] In the sixth additional aspect, either alone or in combination with one or more of the first to fifth aspects, transmitting a specific DMRS sequence associated with an uplink transmission includes one of the following: transmitting a DMRS sequence associated with an uplink transmission that is the same as the DMRS sequence used for one or more other uplink transmissions to indicate that the UE is able to maintain phase coherence across the uplink transmission and one or more other uplink transmissions; or transmitting a DMRS sequence associated with an uplink transmission that is different from the DMRS sequence used for one or more other uplink transmissions to indicate that the UE cannot maintain phase coherence across the uplink transmission and one or more other uplink transmissions.

[0138] In the seventh additional aspect, either alone or in combination with one or more of the first to sixth aspects, process 1000 includes: selecting a specific DMRS sequence from a pool of DMRS sequences comprising at least three DMRS sequences, wherein a different DMRS sequence is selected as the next DMRS sequence in the pool.

[0139] In the eighth additional aspect, either alone or in combination with one or more of the first to seventh aspects, sending an indication as to whether the UE is able to comply with the request includes: sending an indication using a specific DMRS port, wherein the specific DMRS port indicates whether the UE is able to maintain phase coherence across multiple uplink transmissions (e.g., transmitted during the indicated time period) and one or more other uplink transmissions included in the multiple uplink transmissions (e.g., transmitted during the indicated time period).

[0140] In the ninth additional aspect, either alone or in combination with one or more of the first to eighth aspects, it is indicated that the transmission is sent in association with each of the multiple uplink transmissions (e.g., transmitted during the indicated time period).

[0141] In the tenth additional aspect, either alone or in combination with one or more of the first to ninth aspects, the instruction to transmit whether the UE is able to comply with the requested instruction includes: determining the transmission instruction based at least in part on the following: the UE cannot maintain phase coherence across uplink transmissions (e.g., transmissions during the indicated time period) and one or more other uplink transmissions included in the multiple uplink transmissions (e.g., transmissions during the indicated time period).

[0142] In the eleventh additional aspect, either alone or in combination with one or more of the first to tenth aspects, based at least in part on the determination that no transmission indication is made in connection with a particular uplink transmission included in a plurality of uplink transmissions: the UE is able to maintain phase coherence across the particular uplink transmission and at least one other uplink transmission included in a plurality of uplink transmissions (e.g., transmitted during the indicated time period).

[0143] In the twelfth additional aspect, either alone or in combination with one or more of the first to eleventh aspects, the multiple uplink transmissions are multiple physical uplink shared channel transmissions or multiple physical uplink control channel transmissions.

[0144] In the thirteenth additional aspect, receiving a request for application DMRS binding, either alone or in combination with one or more of the first to twelfth aspects, includes receiving the request in a Dedicated Downlink Control Information (DCI), Physical Uplink Shared Channel Grant, Physical Downlink Shared Channel Grant, or Radio Resource Control Message.

[0145] In the fourteenth additional aspect, either alone or in combination with one or more of the first to thirteenth aspects, a request is made to indicate a time period during which DMRS binding will be applied, and during which multiple uplink transmissions are sent.

[0146] In the fifteenth additional aspect, either alone or in combination with one or more of the first to fourteenth aspects, the time period is indicated as at least one of an absolute time period, a number of time slots, or a number of uplink transmissions.

[0147] although Figure 10 An example block of process 1000 is shown, but in some aspects, process 1000 may include... Figure 10 The blocks described in the process 1000 may be fewer, different, or arranged differently than additional blocks. Alternatively, two or more blocks in process 1000 may be executed in parallel.

[0148] Figure 11 This is a flowchart illustrating an example process 1100 performed, for example, by a network entity (e.g., a base station or another network entity) according to this disclosure. Example process 1100 is an example in which a network entity (e.g., base station 110) performs operations associated with indicating whether a UE has applied DMRS binding.

[0149] like Figure 11 As shown, in some aspects, process 1100 may include sending a request to the UE to apply DMRS binding to uplink transmissions (box 1110). For example, network entities (such as those using...) Figure 13 The transmitting component 1306 described herein can send a request to the UE to apply DMRS binding to uplink transmissions, as described above. In some aspects, the network entity can send a request to apply DMRS binding to uplink transmissions so that the network entity can perform joint channel estimation across multiple uplink transmissions scheduled for the UE during the time period indicated in the request.

[0150] like Figure 11 As further shown, in some aspects, process 1100 may include receiving multiple uplink transmissions (box 1120). For example, network entities (such as those using...) Figure 13The receiving component 1302 depicted can receive multiple uplink transmissions, as described above. In some aspects, the network entity can receive multiple uplink transmissions during an indicated time period.

[0151] like Figure 11 As further shown, in some aspects, process 1100 may include receiving an indication of whether the UE is able to comply with a request to apply DMRS binding to multiple uplink transmissions (box 1130). For example, network entities (such as those using...) Figure 13 The receiving component 1302 described herein can receive an indication as described above as to whether the UE is capable of complying with a request to apply DMRS binding to multiple uplink transmissions. In some aspects, the network entity can receive an indication as to whether the UE is capable of complying with a request to apply DMRS binding to multiple uplink transmissions received during that time period.

[0152] Process 1100 may include additional aspects, such as any single aspect or any combination of aspects of one or more other processes described below or elsewhere herein.

[0153] In the first additional aspect, whether the UE can comply with the requested instruction indicates whether the UE can maintain phase coherence across multiple uplink transmissions (e.g., transmissions during a time period).

[0154] In the second additional aspect, either alone or in combination with the first aspect, process 1100 includes performing joint channel estimation at least in part based on whether the UE is able to comply with the requested instructions across all or a subset of multiple uplink transmissions.

[0155] In the third additional aspect, either alone or in combination with one or more of the first and second aspects, process 1100 includes identifying, at least in part, a subset of multiple uplink transmissions to which joint channel estimation is to be applied based on whether the UE is able to comply with the requested instructions, and performing joint channel estimation across the subsets of multiple uplink transmissions.

[0156] In the fourth additional aspect, either alone or in combination with one or more of the first to third aspects, the multiple uplink transmissions are multiple PUSCH transmissions, and receiving an indication of whether the UE can comply with the request includes receiving an indication in a UCI multiplexed with the multiple PUSCH transmissions (e.g., transmitted during the indicated time period).

[0157] In the fifth additional aspect, whether the UE is able to comply with the requested indication, alone or in combination with one or more of the first to fourth aspects, is determined by a single bit in the UCI indicating whether the UE is able to maintain phase coherence across PUSCH transmissions and one or more other PUSCH transmissions included in a plurality of PUSCH transmissions (e.g., transmitted during the indicated time period).

[0158] In the sixth additional aspect, either alone or in combination with one or more of the first to fifth aspects, receiving an indication of whether the UE is able to comply with the request includes: receiving a specific DMRS sequence associated with an uplink transmission among a plurality of uplink transmissions (e.g., transmitted during an indicated time period), wherein the specific DMRS sequence indicates whether the UE is able to maintain phase coherence across uplink transmissions and one or more other uplink transmissions included among the plurality of uplink transmissions (e.g., transmitted during an indicated time period).

[0159] In the seventh additional aspect, either alone or in combination with one or more of the first to sixth aspects, a particular DMRS sequence is one of the following: a first DMRS sequence indicating that the UE can maintain phase coherence across uplink transmissions and one or more other uplink transmissions, or a second DMRS sequence indicating that the UE cannot maintain phase coherence across uplink transmissions and one or more other uplink transmissions.

[0160] In the eighth additional aspect, receiving a specific DMRS sequence associated with an uplink transmission, either alone or in combination with one or more of the first to seventh aspects, includes one of the following: receiving a DMRS sequence associated with an uplink transmission that is the same as the DMRS sequence used for one or more other uplink transmissions, to indicate that the UE is able to maintain phase coherence across the uplink transmission and one or more other uplink transmissions; or receiving a DMRS sequence associated with an uplink transmission that is different from the DMRS sequence used for one or more other uplink transmissions, to indicate that the UE cannot maintain phase coherence across the uplink transmission and one or more other uplink transmissions.

[0161] In the ninth additional aspect, receiving an indication of whether the UE is able to comply with a request, either alone or in combination with one or more of the first to eighth aspects, includes: receiving an indication using a specific DMRS port, wherein the specific DMRS port indicates whether the UE is able to maintain phase coherence across multiple uplink transmissions (e.g., transmitted during the indicated time period) and one or more other uplink transmissions included in the multiple uplink transmissions (e.g., transmitted during the indicated time period).

[0162] In the tenth additional aspect, either alone or in combination with one or more of the first to ninth aspects, it is indicated that the reception is associated with each uplink transmission included in a plurality of uplink transmissions (e.g., transmitted during the indicated time period).

[0163] In the eleventh additional aspect, either alone or in combination with one or more of the first to tenth aspects, the multiple uplink transmissions are multiple physical uplink shared channel transmissions or multiple physical uplink control channel transmissions.

[0164] In the twelfth additional aspect, sending a request for application DMRS binding, either alone or in combination with one or more of the first to eleventh aspects, includes sending the request in a Dedicated Downlink Control Information (DCI), Physical Uplink Shared Channel Grant, Physical Downlink Shared Channel Grant, or Radio Resource Control Message.

[0165] In the thirteenth additional aspect, either alone or in combination with one or more of the first to twelfth aspects, a request is made to indicate a time period during which DMRS binding will be applied, and multiple uplink transmissions are sent during that time period.

[0166] In the fourteenth additional aspect, either alone or in combination with one or more of the first to thirteenth aspects, the time period is indicated as at least one of an absolute time period, a number of time slots, or a number of uplink transmissions.

[0167] although Figure 11 An example block of process 1100 is shown, but in some aspects, process 1100 may include... Figure 11 The blocks depicted in the process 1100 may be fewer, different, or arranged differently than additional blocks. Alternatively, two or more blocks in process 1100 may be executed in parallel.

[0168] Figure 12 This is a block diagram of an example apparatus 1200 for wireless communication according to the present disclosure. Apparatus 1200 may be a UE, or a UE may include apparatus 1200. In some aspects, apparatus 1200 includes a receiving component 1202, a communication manager 1204, and a transmitting component 1206, which may communicate with each other (e.g., via one or more buses). As shown, apparatus 1200 may use the receiving component 1202 and the transmitting component 1206 to communicate with another apparatus 1208 (such as a UE, network entity, base station, or another wireless communication device).

[0169] In some respects, device 1200 can be configured to perform the functions described herein. Figures 6-8 One or more operations described herein. Additionally or alternatively, the apparatus 1200 may be configured to perform one or more processes described herein, such as Figure 10 The process 1000. In some aspects, the device 1200 may include the above-mentioned combination. Figure 2 One or more components of the UE described.

[0170] Receiver 1202 may receive communications from device 1208, such as reference signals, control information, data communications, or combinations thereof. Receiver 1202 may provide the received communications to one or more other components of device 1200 (such as communication manager 1204). In some aspects, receiver 1202 may perform signal processing on the received communications (such as filtering, amplification, demodulation, analog-to-digital conversion, demultiplexing, deinterleaving, demapping, equalization, interference cancellation, or decoding, and other examples), and may provide the processed signal to one or more other components. In some aspects, receiver 1202 may include the above-described combinations... Figure 2 The described UE includes one or more antennas, demodulators, MIMO detectors, receiver processors, controllers / processors, memory, or combinations thereof.

[0171] Transmitting component 1206 can transmit communications, such as reference signals, control information, data communications, or combinations thereof, to device 1208. In some aspects, communication manager 1204 can generate communications and transmit the generated communications to transmitting component 1206 for transmission to device 1208. In some aspects, transmitting component 1206 can perform signal processing (such as filtering, amplification, modulation, digital-to-analog conversion, multiplexing, interleaving, mapping, or encoding, and other examples) on the generated communications and can transmit the processed signal to device 1208. In some aspects, transmitting component 1206 can include the above-described combinations... Figure 2 The described UE includes one or more antennas, modulators, transmit MIMO processors, transmit processors, controllers / processors, memory, or combinations thereof. In some aspects, transmit component 1206 may be co-located with receive component 1202 in a transceiver.

[0172] Communication manager 1204 may receive, or may cause receiving component 1202 to receive, a request to apply DMRS binding to uplink transmissions. Communication manager 1204 may send, or may cause sending component 1206 to send, multiple uplink transmissions. Communication manager 1204 may send, or may cause sending component 1206 to send, an indication of whether the UE can comply with the request, based at least in part on whether the UE can maintain phase coherence across multiple uplink transmissions. In some aspects, communication manager 1204 may perform one or more operations as described elsewhere herein by one or more components of communication manager 1204.

[0173] Communication Manager 1204 may include the above combination Figure 2The described UE includes a controller / processor, memory, or a combination thereof. In some aspects, the communication manager 1204 includes a set of components, such as determining component 1210, selecting component 1212, or a combination thereof. Alternatively, the set of components may be separate from and different from the communication manager 1204. In some aspects, one or more components in the set of components may include or may be combined as described above. Figure 2 The described UE is implemented in a controller / processor, memory, or a combination thereof. Additionally or alternatively, one or more components in the component set may be implemented at least partially as software stored in memory. For example, a component (or a portion of a component) may be implemented as instructions or code stored in a non-transitory computer-readable medium and executable by a controller or processor to perform the function or operation of the component.

[0174] The receiving component 1202 can receive a request to apply DMRS binding to uplink transmissions. The transmitting component 1206 can transmit multiple uplink transmissions. The transmitting component 1206 can transmit an indication of whether the UE can comply with the request, based at least in part on whether the UE can maintain phase coherence across the multiple transmitted uplink transmissions.

[0175] The determining component 1210 can determine a specific DMRS sequence based at least in part on a formula used for sequence initialization seed, which includes parameters indicating whether the UE can maintain phase coherence across uplink transmissions and one or more other uplink transmissions. The selecting component 1212 can select a specific DMRS sequence from a pool of DMRS sequences comprising at least three DMRS sequences, wherein a different DMRS sequence is selected as the next DMRS sequence in the pool.

[0176] Figure 12 The number and arrangement of components shown are provided as an example only. In practice, there may be more... Figure 12 The components shown are compared to components with more components, fewer components, different components, or components with different arrangements. Furthermore, Figure 12 The two or more components shown can be implemented within a single component, or Figure 12 The single component shown can be implemented as multiple distributed components. Additionally or alternatively, Figure 12 The collection of (one or more) components shown can perform actions described by Figure 12 The other set of components shown performs one or more functions.

[0177] Figure 13This is a block diagram of an example apparatus 1300 for wireless communication according to the present disclosure. Apparatus 1300 may be a network entity (such as a base station), or a network entity may include apparatus 1300. In some aspects, apparatus 1300 includes a receiving component 1302, a communication manager 1304, and a transmitting component 1306, which may communicate with each other (e.g., via one or more buses). As shown, apparatus 1300 may use the receiving component 1302 and the transmitting component 1306 to communicate with another apparatus 1308 (such as a UE, network entity, base station, or another wireless communication device).

[0178] In some respects, device 1300 can be configured to perform the functions described herein. Figures 6-8 One or more operations described herein. Additionally or alternatively, the apparatus 1300 may be configured to perform one or more processes described herein, such as Figure 11 The process 1100. In some aspects, the device 1300 may include the above-described combination. Figure 2 One or more components of the base station described.

[0179] Receiver 1302 may receive communications from device 1308, such as reference signals, control information, data communications, or combinations thereof. Receiver 1302 may provide the received communications to one or more other components of device 1300 (such as communication manager 1304). In some aspects, receiver 1302 may perform signal processing on the received communications (such as filtering, amplification, demodulation, analog-to-digital conversion, demultiplexing, deinterleaving, demapping, equalization, interference cancellation, or decoding, and other examples), and may provide the processed signal to one or more other components. In some aspects, receiver 1302 may include the above-described combinations... Figure 2 The described base station includes one or more antennas, demodulators, MIMO detectors, receiver processors, controllers / processors, memory, or combinations thereof.

[0180] Transmitting component 1306 can transmit communications, such as reference signals, control information, data communications, or combinations thereof. In some aspects, communication manager 1304 can generate communications and can transmit the generated communications to transmitting component 1306 for transmission to device 1308. In some aspects, transmitting component 1306 can perform signal processing (such as filtering, amplification, modulation, digital-to-analog conversion, multiplexing, interleaving, mapping, or encoding, and other examples) on the generated communications and can transmit the processed signal to device 1308. In some aspects, transmitting component 1306 can include the above-described combinations... Figure 2The described base station includes one or more antennas, modulators, transmit MIMO processors, transmit processors, controllers / processors, memory, or combinations thereof. In some aspects, transmit component 1306 may be co-located with receive component 1302 in a transceiver.

[0181] Communication manager 1304 may send, or may cause sending component 1306 to send, a request to apply DMRS binding to uplink transmissions. Communication manager 1304 may receive, or may cause receiving component 1302 to receive multiple uplink transmissions. Communication manager 1304 may receive, or may cause receiving component 1302 to receive an indication of whether the UE is capable of complying with the request to apply DMRS binding to multiple uplink transmissions. In some aspects, communication manager 1304 may perform one or more operations as described elsewhere herein by one or more components of communication manager 1304.

[0182] Communication manager 1304 may include the above combination Figure 2 The described base station includes a controller / processor, memory, scheduler, communication unit, or a combination thereof. In some aspects, the communication manager 1304 includes a collection of components, such as a channel estimation component 1310, an identification component 1312, or a combination thereof. Alternatively, the collection of components may be separate from and distinct from the communication manager 1304. In some aspects, one or more components in the collection may include or may be combined as described above. Figure 2 The described base station is implemented in a controller / processor, memory, scheduler, communication unit, or a combination thereof. Additionally or alternatively, one or more components in the set of components may be implemented at least partially as software stored in memory. For example, a component (or a portion of a component) may be implemented as instructions or code stored in a non-transitory computer-readable medium and executable by a controller or processor to perform the function or operation of the component.

[0183] The transmitting component 1306 can send a request to apply DMRS binding to uplink transmissions. The receiving component 1302 can receive multiple uplink transmissions. The receiving component 1302 can receive an indication of whether the UE can comply with the request to apply DMRS binding to multiple uplink transmissions.

[0184] Channel estimation component 1310 may perform joint channel estimation, at least in part, based on whether the UE can comply with the requested instructions across all multiple uplink transmissions or a subset of multiple uplink transmissions. Identification component 1312 may identify, at least in part, the subset of multiple uplink transmissions to which joint channel estimation is to be applied, based on whether the UE can comply with the requested instructions. Channel estimation component 1310 may perform joint channel estimation across a subset of multiple uplink transmissions.

[0185] Figure 13The number and arrangement of components shown are provided as an example only. In practice, there may be more... Figure 13 The components shown are compared to components with more components, fewer components, different components, or components with different arrangements. Furthermore, Figure 13 The two or more components shown can be implemented in a single component, or Figure 13 The single component shown can be implemented as multiple distributed components. Additionally or alternatively, Figure 13 The collection of (one or more) components shown can perform actions described by Figure 13 The other component set shown performs one or more functions.

[0186] The following provides an overview of some aspects of this disclosure:

[0187] Aspect 1: A wireless communication method performed by a user equipment (UE) comprising: receiving a request to bind a demodulation reference signal (DMRS) to uplink transmissions by maintaining phase coherence across multiple uplink transmissions to be transmitted within the indicated time period to achieve joint channel estimation across multiple uplink transmissions; transmitting multiple uplink transmissions within the indicated time period; and transmitting an indication, at least in part, based on whether the UE can maintain phase coherence across the multiple uplink transmissions transmitted during the indicated time period, whether the UE can comply with the request.

[0188] Aspect 2: According to the method of aspect 1, the multiple uplink transmissions are multiple physical uplink shared channel (PUSCH) transmissions; and the indication of whether the UE can comply with the request includes: sending an indication in uplink control information (UCI) multiplexed with the PUSCH transmissions in the multiple PUSCH transmissions sent during the indicated time period.

[0189] Aspect 3: According to the method of aspect 2, the indication of whether the UE can comply with the requested indication consists of a single bit in the UCI, which indicates whether the UE can maintain phase coherence across PUSCH transmissions and one or more other PUSCH transmissions included in a plurality of PUSCH transmissions sent during the indicated time period.

[0190] Aspect 4: According to the method of aspect 1, wherein sending an indication of whether the UE can comply with the request includes: sending a specific DMRS sequence associated with an uplink transmission among a plurality of uplink transmissions sent during the indicated time period, wherein the specific DMRS sequence indicates whether the UE can maintain phase coherence across uplink transmissions and one or more other uplink transmissions among a plurality of uplink transmissions sent during the indicated time period.

[0191] Aspect 5: According to the method of aspect 4, a particular DMRS sequence is one of the following: a first DMRS sequence indicating that the UE can maintain phase coherence across uplink transmissions and one or more other uplink transmissions, or a second DMRS sequence indicating that the UE cannot maintain phase coherence across uplink transmissions and one or more other uplink transmissions.

[0192] Aspect 6: The method according to any one of Aspects 4-5 further includes: determining a particular DMRS sequence based at least in part on a formula for sequence initialization seed, the formula including parameters indicating whether the UE is able to maintain phase coherence across uplink transmissions and one or more other uplink transmissions.

[0193] Aspect 7: According to the method of any one of Aspects 4-6, the transmission of a specific DMRS sequence associated with an uplink transmission includes one of the following: transmitting a DMRS sequence associated with an uplink transmission that is the same as the DMRS sequence used for one or more other uplink transmissions to indicate that the UE is able to maintain phase coherence across uplink transmissions and one or more other uplink transmissions, or transmitting a DMRS sequence associated with an uplink transmission that is different from the DMRS sequence used for one or more other uplink transmissions to indicate that the UE cannot maintain phase coherence across uplink transmissions and one or more other uplink transmissions.

[0194] Aspect 8: According to the method of aspect 7, it further includes: selecting a specific DMRS sequence from a pool of DMRS sequences comprising at least three DMRS sequences, wherein a different DMRS sequence is selected as the next DMRS sequence in the pool.

[0195] Aspect 9: According to the method of aspect 1, wherein sending an indication of whether the UE can comply with the request includes: sending an indication using a specific DMRS port, wherein the specific DMRS port indicates whether the UE can maintain phase coherence across uplink transmissions in a plurality of uplink transmissions sent during the indicated time period and one or more other uplink transmissions included in the plurality of uplink transmissions sent during the indicated time period.

[0196] Aspect 10: The method according to any one of aspects 1-9, wherein the indication is sent in association with each of a plurality of uplink transmissions included in the indicated time period.

[0197] Aspect 11: The method according to any one of aspects 1-9, wherein sending an indication of whether the UE can comply with the request includes: sending the indication based at least in part on a determination that the UE cannot maintain phase coherence across uplink transmissions of a plurality of uplink transmissions sent during the indicated time period and one or more other uplink transmissions of a plurality of uplink transmissions sent during the indicated time period.

[0198] Aspect 12: According to the method of aspect 11, wherein, based at least in part on the determination that the UE is able to maintain phase coherence across a specific uplink transmission and at least one other uplink transmission among a plurality of uplink transmissions transmitted during an indicated time period, no transmission indication associated with a specific uplink transmission among the plurality of uplink transmissions is made.

[0199] Aspect 13: According to the method of any one of Aspects 1-12, the multiple uplink transmissions are multiple physical uplink shared channel transmissions or multiple physical uplink control channel transmissions.

[0200] Aspect 14: According to the method of any one of Aspects 1-13, receiving a request for application DMRS binding includes receiving the request in a Dedicated Downlink Control Information (DCI), Physical Uplink Shared Channel Grant, Physical Downlink Shared Channel Grant, or Radio Resource Control Message.

[0201] Aspect 15: The method according to any one of aspects 1-14, wherein the indicated time period is indicated as at least one of an absolute time period, a number of time slots, or a number of uplink transmissions.

[0202] Aspect 16: A wireless communication method performed by a network entity, comprising: sending a request to a user equipment (UE) to apply a demodulation reference signal (DMRS) binding to an uplink transmission so that the network entity can perform joint channel estimation across multiple uplink transmissions scheduled for the UE during a time period indicated in the request; receiving the multiple uplink transmissions during the indicated time period; and receiving an indication regarding whether the UE is able to comply with the request to apply the DMRS binding to the multiple uplink transmissions received during the time period.

[0203] Aspect 17: According to the method of aspect 16, whether the UE can comply with the requested instruction indicates whether the UE can maintain phase coherence across multiple uplink transmissions sent during the time period.

[0204] Aspect 18: The method according to any one of Aspects 16-17 further includes: performing joint channel estimation across all or a subset of multiple uplink transmissions, based at least in part on whether the UE is able to comply with the requested instructions.

[0205] Aspect 19: The method according to any one of aspects 16-18 further includes: identifying a subset of multiple uplink transmissions to which joint channel estimation is to be applied, at least in part based on whether the UE is able to comply with the requested instruction; and performing joint channel estimation across the subsets of multiple uplink transmissions.

[0206] Aspect 20: According to the method of any one of aspects 16-19, the multiple uplink transmissions are multiple physical uplink shared channel (PUSCH) transmissions; and the indication of whether the UE can comply with the request includes: receiving an indication in uplink control information (UCI) multiplexed with a PUSCH transmission among the multiple PUSCH transmissions sent during the indicated time period.

[0207] Aspect 21: According to the method of aspect 20, the indication of whether the UE can comply with the requested indication consists of a single bit in the UCI, which indicates whether the UE can maintain phase coherence across PUSCH transmissions and one or more other PUSCH transmissions included in a plurality of PUSCH transmissions sent during the indicated time period.

[0208] Aspect 22: The method according to any one of aspects 16-19, wherein receiving an indication of whether the UE can comply with the request includes: receiving a specific DMRS sequence associated with an uplink transmission among a plurality of uplink transmissions transmitted during the indicated time period, wherein the specific DMRS sequence indicates whether the UE can maintain phase coherence across uplink transmissions and one or more other uplink transmissions among a plurality of uplink transmissions transmitted during the indicated time period.

[0209] Aspect 23: According to the method of aspect 22, a particular DMRS sequence is one of the following: a first DMRS sequence indicating that the UE can maintain phase coherence across uplink transmissions and one or more other uplink transmissions, or a second DMRS sequence indicating that the UE cannot maintain phase coherence across uplink transmissions and one or more other uplink transmissions.

[0210] Aspect 24: According to the method of any one of Aspects 22-23, receiving a specific DMRS sequence associated with an uplink transmission includes one of the following: receiving a DMRS sequence associated with an uplink transmission that is the same as the DMRS sequence used for one or more other uplink transmissions, to indicate that the UE is able to maintain phase coherence across the uplink transmission and one or more other uplink transmissions; or receiving a DMRS sequence associated with an uplink transmission that is different from the DMRS sequence used for one or more other uplink transmissions, to indicate that the UE cannot maintain phase coherence across the uplink transmission and one or more other uplink transmissions.

[0211] Aspect 25: According to the method of any one of aspects 16-19, receiving an indication regarding whether the UE is able to comply with the request includes: receiving an indication using a specific DMRS port, wherein the specific DMRS port indicates whether the UE is able to maintain phase coherence across uplink transmissions in a plurality of uplink transmissions transmitted during the indicated time period and one or more other uplink transmissions included in the plurality of uplink transmissions transmitted during the indicated time period.

[0212] Aspect 26: The method according to any one of aspects 16-25, wherein the indication is received in association with each of a plurality of uplink transmissions included in the indicated time period.

[0213] Aspect 27: According to the method of any one of Aspects 16-26, the multiple uplink transmissions are multiple physical uplink shared channel transmissions or multiple physical uplink control channel transmissions.

[0214] Aspect 28: According to the method of any one of Aspects 16-27, sending the request for application DMRS binding includes sending the request in a Dedicated Downlink Control Information (DCI), Physical Uplink Shared Channel Grant, Physical Downlink Shared Channel Grant, or Radio Resource Control Message.

[0215] Aspect 29: The method according to any one of aspects 16-28, wherein the indicated time period is indicated as at least one of an absolute time period, a number of time slots, or a number of uplink transmissions.

[0216] Aspect 30: An apparatus for wireless communication at a device, comprising a processor; a memory coupled to the processor; and instructions stored in the memory and executable by the processor to cause the apparatus to perform one or more aspects of aspects 1-15.

[0217] Aspect 31: An apparatus for wireless communication, comprising a memory and one or more processors coupled to the memory, the memory and the one or more processors being configured to perform the methods of one or more aspects of aspects 1-15.

[0218] Aspect 32: A device for wireless communication, comprising at least one component for performing the methods of one or more aspects of aspects 1-15.

[0219] Aspect 33: A non-transitory computer-readable medium storing code for wireless communication, the code including instructions executable by a processor to perform methods of one or more aspects of aspects 1-15.

[0220] Aspect 34: A non-transitory computer-readable medium storing a set of instructions for wireless communication, the set of instructions including one or more instructions which, when executed by one or more processors of the device, cause the device to perform one or more aspects of aspects 1-15.

[0221] Aspect 35: An apparatus for wireless communication at a device, comprising a processor; a memory coupled to the processor; and instructions stored in the memory and executable by the processor to cause the apparatus to perform one or more methods of aspects 16-29.

[0222] Aspect 36: An apparatus for wireless communication, comprising a memory and one or more processors coupled to the memory, the memory and the one or more processors being configured to perform the methods of one or more aspects of aspects 16-29.

[0223] Aspect 37: An apparatus for wireless communication, comprising at least one component for performing the methods of one or more aspects of aspects 16-29.

[0224] Aspect 38: A non-transitory computer-readable medium storing code for wireless communication, the code including instructions executable by a processor to perform methods of one or more aspects of aspects 16-29.

[0225] Aspect 39: A non-transitory computer-readable medium storing a set of instructions for wireless communication, the set of instructions including one or more instructions which, when executed by one or more processors of the device, cause the device to perform methods of one or more aspects of aspects 16-29.

[0226] Aspect 40: A wireless communication method performed by a user equipment (UE) comprising: receiving a request to bind a demodulation reference signal (DMRS) to an uplink transmission; transmitting a plurality of uplink transmissions; and transmitting an indication of whether the UE can comply with the request, at least in part based on whether the UE can maintain phase coherence across the plurality of uplink transmissions.

[0227] Aspect 41: According to the method of aspect 40, the multiple uplink transmissions are multiple physical uplink shared channel (PUSCH) transmissions; and the indication of whether the UE can comply with the request includes: sending an indication in uplink control information (UCI) multiplexed with the PUSCH transmissions in the multiple PUSCH transmissions.

[0228] Aspect 42: According to the method of aspect 41, the indication of whether the UE can comply with the requested instruction consists of a single bit in the UCI, which indicates whether the UE can maintain phase coherence across PUSCH transmissions and one or more other PUSCH transmissions included in a plurality of PUSCH transmissions.

[0229] Aspect 43: According to the method of aspect 40, wherein sending an indication of whether the UE is able to comply with the request includes: sending a specific DMRS sequence associated with an uplink transmission among a plurality of uplink transmissions, wherein the specific DMRS sequence indicates whether the UE is able to maintain phase coherence across uplink transmissions and one or more other uplink transmissions included among the plurality of uplink transmissions.

[0230] Aspect 44: According to the method of aspect 43, a particular DMRS sequence is one of the following: a first DMRS sequence indicating that the UE can maintain phase coherence across uplink transmissions and one or more other uplink transmissions, or a second DMRS sequence indicating that the UE cannot maintain phase coherence across uplink transmissions and one or more other uplink transmissions.

[0231] Aspect 45: The method according to any one of aspects 43-44 further includes: determining a particular DMRS sequence based at least in part on a formula for sequence initialization seed, the formula including parameters indicating whether the UE is able to maintain phase coherence across uplink transmissions and one or more other uplink transmissions.

[0232] Aspect 46: According to the method of any one of Aspects 43-45, the transmission of a specific DMRS sequence associated with an uplink transmission includes one of the following: transmitting a DMRS sequence associated with the uplink transmission that is the same as the DMRS sequence used for one or more other uplink transmissions to indicate that the UE is able to maintain phase coherence across the uplink transmission and one or more other uplink transmissions, or transmitting a DMRS sequence associated with the uplink transmission that is different from the DMRS sequence used for one or more other uplink transmissions to indicate that the UE cannot maintain phase coherence across the uplink transmission and one or more other uplink transmissions.

[0233] Aspect 47: The method according to aspect 46 further includes: selecting a specific DMRS sequence from a pool of DMRS sequences comprising at least three DMRS sequences, wherein a different DMRS sequence is selected as the next DMRS sequence in the pool.

[0234] Aspect 48: According to the method of aspect 40, wherein sending an indication as to whether the UE can comply with the request includes: sending an indication using a specific DMRS port, wherein the specific DMRS port indicates whether the UE can maintain phase coherence across uplink transmissions in multiple uplink transmissions and one or more other uplink transmissions included in the multiple uplink transmissions.

[0235] Aspect 49: The method according to any one of aspects 40-48, wherein the indication is sent in association with each uplink transmission included in a plurality of uplink transmissions.

[0236] Aspect 50: The method according to any one of aspects 40-48, wherein sending an indication as to whether the UE can comply with the request comprises: sending the indication based at least in part on a determination that the UE cannot maintain phase coherence across uplink transmissions in a plurality of uplink transmissions and one or more other uplink transmissions included in the plurality of uplink transmissions.

[0237] Aspect 51: According to the method of aspect 50, wherein at least in part based on the determination that the UE is able to maintain phase coherence across a particular uplink transmission and at least one other uplink transmission included in a plurality of uplink transmissions, no transmission indication associated with the particular uplink transmission included in a plurality of uplink transmissions is made.

[0238] Aspect 52: According to the method of any one of aspects 40-51, the multiple uplink transmissions are multiple physical uplink shared channel transmissions or multiple physical uplink control channel transmissions.

[0239] Aspect 53: According to the method of any one of Aspects 40-52, receiving a request for application DMRS binding includes receiving the request in a Dedicated Downlink Control Information (DCI), Physical Uplink Shared Channel Grant, Physical Downlink Shared Channel Grant, or Radio Resource Control Message.

[0240] Aspect 54: The method according to any one of aspects 40-53, wherein the request indicates a time period during which DMRS binding will be applied, and wherein multiple uplink transmissions are sent during that time period.

[0241] Aspect 55: According to the method of aspect 54, the time period is indicated as at least one of an absolute time period, a number of time slots, or a number of uplink transmissions.

[0242] Aspect 56: A wireless communication method performed by a network entity, comprising: sending a request to a user equipment (UE) to bind a demodulation reference signal (DMRS) to an uplink transmission; receiving a plurality of uplink transmissions; and receiving an indication of whether the UE is capable of complying with the request to bind the DMRS to the plurality of uplink transmissions.

[0243] Aspect 57: According to the method of aspect 56, whether the UE can comply with the requested instruction indicates whether the UE can maintain phase coherence across multiple uplink transmissions.

[0244] Aspect 58: The method according to any one of aspects 56-57 further includes: performing joint channel estimation at least in part based on whether the UE is able to comply with the requested instructions across all or a subset of the multiple uplink transmissions.

[0245] Aspect 59: The method according to any one of aspects 56-58 further includes: identifying a subset of multiple uplink transmissions to which joint channel estimation is to be applied, at least in part based on whether the UE is able to comply with the requested instruction; and performing joint channel estimation across the subsets of multiple uplink transmissions.

[0246] Aspect 60: According to the method of any one of Aspects 56-59, wherein the multiple uplink transmissions are multiple physical uplink shared channel (PUSCH) transmissions; wherein receiving an indication of whether the UE can comply with the request includes receiving an indication in uplink control information (UCI) multiplexed with the PUSCH transmissions in the multiple PUSCH transmissions.

[0247] Aspect 61: According to the method of aspect 60, the indication of whether the UE can comply with the requested instruction consists of a single bit in the UCI, which indicates whether the UE can maintain phase coherence across PUSCH transmissions and one or more other PUSCH transmissions included in a plurality of PUSCH transmissions.

[0248] Aspect 62: The method according to any one of aspects 56-59, wherein receiving an indication of whether the UE can comply with a request comprises: receiving a specific DMRS sequence associated with an uplink transmission among a plurality of uplink transmissions, wherein the specific DMRS sequence indicates whether the UE can maintain phase coherence across uplink transmissions and one or more other uplink transmissions included among the plurality of uplink transmissions.

[0249] Aspect 63: According to the method of aspect 62, a particular DMRS sequence is one of the following: a first DMRS sequence indicating that the UE can maintain phase coherence across uplink transmissions and one or more other uplink transmissions, or a second DMRS sequence indicating that the UE cannot maintain phase coherence across uplink transmissions and one or more other uplink transmissions.

[0250] Aspect 64: According to the method of any one of Aspects 62-63, receiving a specific DMRS sequence associated with an uplink transmission includes one of the following: receiving a DMRS sequence associated with the uplink transmission that is the same as the DMRS sequence used for one or more other uplink transmissions, to indicate that the UE is able to maintain phase coherence across the uplink transmission and one or more other uplink transmissions; or receiving a DMRS sequence associated with the uplink transmission that is different from the DMRS sequence used for one or more other uplink transmissions, to indicate that the UE cannot maintain phase coherence across the uplink transmission and one or more other uplink transmissions.

[0251] Aspect 65: The method according to any one of aspects 56-59, wherein receiving an indication regarding whether the UE is able to comply with a request comprises: receiving an indication using a specific DMRS port, wherein the specific DMRS port indicates whether the UE is able to maintain phase coherence across uplink transmissions in a plurality of uplink transmissions and one or more other uplink transmissions included in the plurality of uplink transmissions.

[0252] Aspect 66: The method according to any one of aspects 56-65, wherein the indication is received in association with each uplink transmission included in a plurality of uplink transmissions.

[0253] Aspect 67: According to the method of any one of aspects 56-66, the multiple uplink transmissions are multiple physical uplink shared channel transmissions or multiple physical uplink control channel transmissions.

[0254] Aspect 68: According to the method of any one of Aspects 56-67, sending the request for application DMRS binding includes sending the request in a Dedicated Downlink Control Information (DCI), Physical Uplink Shared Channel Grant, Physical Downlink Shared Channel Grant, or Radio Resource Control Message.

[0255] Aspect 69: According to the method of any one of Aspects 56-68, the request indicates a time period during which DMRS binding will be applied; and multiple uplink transmissions are received during that time period.

[0256] Aspect 70: According to the method of aspect 69, the time period is indicated as at least one of an absolute time period, a number of time slots, or a number of uplink transmissions.

[0257] Aspect 71: An apparatus for wireless communication at a device, comprising a processor; a memory coupled to the processor; and instructions stored in the memory and executable by the processor to cause the apparatus to perform the methods of one or more aspects of aspects 40-55.

[0258] Aspect 72: An apparatus for wireless communication, comprising a memory and one or more processors coupled to the memory, the one or more processors being configured to perform the methods of one or more aspects of aspects 40-55.

[0259] Aspect 73: An apparatus for wireless communication, comprising at least one component for performing the methods of one or more aspects of aspects 40-55.

[0260] Aspect 74: A non-transitory computer-readable medium storing code for wireless communication, the code including instructions executable by a processor to perform methods of one or more aspects of aspects 40-55.

[0261] Aspect 75: A non-transitory computer-readable medium storing a set of instructions for wireless communication, the set of instructions including one or more instructions which, when executed by one or more processors of the device, cause the device to perform methods of one or more aspects of aspects 40-55.

[0262] Aspect 76: An apparatus for wireless communication at a device, comprising a processor; a memory coupled to the processor; and instructions stored in the memory and executable by the processor to cause the apparatus to perform the methods of one or more aspects of aspects 56-70.

[0263] Aspect 77: An apparatus for wireless communication, comprising a memory and one or more processors coupled to the memory, the one or more processors being configured to perform the methods of one or more aspects of aspects 56-70.

[0264] Aspect 78: An apparatus for wireless communication, comprising at least one component for performing the methods of one or more aspects of aspects 56-70.

[0265] Aspect 79: A non-transitory computer-readable medium storing code for wireless communication, the code including instructions executable by a processor to perform methods of one or more aspects of aspects 56-70.

[0266] Aspect 80: A non-transitory computer-readable medium storing a set of instructions for wireless communication, the set of instructions including one or more instructions which, when executed by one or more processors of the device, cause the device to perform methods of one or more aspects of aspects 56-70.

[0267] The foregoing disclosure provides illustrations and descriptions, but is not intended to be exhaustive or to limit the aspects to the precise forms disclosed. Modifications and variations can be made based on the foregoing disclosure, or modifications and variations can be derived from practice in these aspects.

[0268] As used herein, the term "component" is intended to be broadly interpreted as hardware, firmware, or a combination of hardware and software. As used herein, a processor is implemented as hardware, firmware, or a combination of hardware and software. It will be apparent that the systems or methods described herein can be implemented in various forms of hardware, firmware, or a combination of hardware and software. The actual dedicated control hardware or software code used to implement these systems or methods is not limited to these aspects. Therefore, this document describes the operation and behavior of systems or methods without reference to specific software code—it should be understood that software and hardware can be designed to implement systems or methods, at least in part, based on the descriptions herein.

[0269] As used in this article, depending on the context, satisfying a threshold can mean a value greater than the threshold, greater than or equal to the threshold, less than the threshold, less than or equal to the threshold, equal to the threshold, or not equal to the threshold, and other examples.

[0270] Even if a specific combination of features is recited in the claims or disclosed in the specification, such combinations are not intended to limit the disclosure of aspects. In fact, many of these features can be combined in ways not specifically recited in the claims or disclosed in the specification. Although each dependent claim listed below may depend directly on only one claim, the disclosure of aspects includes combinations of each dependent claim with every other claim in the claim set. As used herein, the phrase “at least one” in the list of items refers to any combination of those items, including single members. As an example, “at least one of a, b, or c” is intended to cover a, b, c, ab, ac, bc, and abc, as well as any combination of multiples of the same number of elements (e.g., aa, aaa, aab, aac, abb, acc, bb, bbb, bbc, cc, and ccc, or any other order of a, b, and c).

[0271] Unless explicitly stated otherwise, no element, action, or instruction used herein should be construed as critical or necessary. Furthermore, as used herein, the articles “a” and “one” are intended to include one or more items and may be used interchangeably with “one or more.” Furthermore, as used herein, the article “the” is intended to include one or more items associated with the article “the” and may be used interchangeably with “one or more.” Furthermore, as used herein, the terms “set” and “group” are intended to include one or more items (e.g., related items, unrelated items, or a combination of related and unrelated items) and may be used interchangeably with “one or more.” If there is only one item, the phrase “only one” or similar language is used. Furthermore, as used herein, the terms “have,” “possess,” “own,” and similar terms are intended to be open-ended terms. Furthermore, unless explicitly stated otherwise, the phrase “based on” is intended to mean “at least partially based on.” Furthermore, as used herein, unless explicitly stated otherwise (e.g., if used in combination with “any” or “only one of…”), the term “or” when used in a series is intended to be inclusive and may be used interchangeably with “and / or.”

Claims

1. A user equipment (UE) for wireless communication, comprising: Memory; as well as One or more processors, coupled to the memory, are configured to: Receive a request to bind the demodulation reference signal DMRS for uplink transmission; Send multiple uplink transmissions; as well as The indication of whether the UE can comply with the request is sent at least in part based on whether the UE can transmit maintain phase coherence across the plurality of uplinks, wherein the one or more processors for sending the indication of whether the UE can comply with the request are configured to: Send a specific DMRS sequence associated with an uplink transmission among the plurality of uplink transmissions, wherein the specific DMRS sequence indicates whether the UE is able to maintain phase coherence across the uplink transmission and one or more other uplink transmissions included in the plurality of uplink transmissions.

2. The UE according to claim 1, wherein, The specific DMRS sequence is one of the following: Instructing the UE to maintain phase coherence of a first DMRS sequence across the uplink transmission and the one or more other uplink transmissions, or A second DMRS sequence indicating that the UE is unable to maintain phase coherence across the uplink transmission and the one or more other uplink transmissions.

3. The UE according to claim 1, wherein, The one or more processors are further configured to: determine the specific DMRS based at least in part on a formula for sequence initialization seed, the formula including parameters indicating whether the UE is able to maintain phase coherence across the uplink transmission and the one or more other uplink transmissions.

4. The UE according to claim 1, wherein, The one or more processors used to transmit the specific DMRS sequence associated with the uplink transmission are configured to: Sending a DMRS sequence associated with the uplink transmission that is the same as the DMRS sequence used for the one or more other uplink transmissions, to indicate that the UE is able to maintain phase coherence across the uplink transmission and the one or more other uplink transmissions, or Send a DMRS sequence that is different from the DMRS sequence used for the one or more other uplink transmissions associated with the uplink transmission, to indicate that the UE is unable to maintain phase coherence across the uplink transmission and the one or more other uplink transmissions.

5. The UE according to claim 4, wherein, The one or more processors are further configured to: select the specific DMRS sequence from a pool of DMRS sequences comprising at least three DMRS sequences, wherein the different DMRS sequence is selected as the next DMRS sequence in the pool.

6. The UE according to claim 1, wherein, The instruction is sent in association with each uplink transmission included in the plurality of uplink transmissions.

7. The UE according to claim 1, wherein, The one or more processors used to send the indication of whether the UE can comply with the request are configured to send the indication at least in part based on a determination that the UE cannot maintain phase coherence across uplink transmissions in the plurality of uplink transmissions and one or more other uplink transmissions included in the plurality of uplink transmissions.

8. The UE according to claim 7, wherein, Based at least in part on the determination that the UE can maintain phase coherence across a specific uplink transmission included in the plurality of uplink transmissions and at least one other uplink transmission included in the plurality of uplink transmissions, the indication is not transmitted in association with the specific uplink transmission.

9. The UE according to claim 1, wherein, The multiple uplink transmissions are either multiple physical uplink shared channel transmissions or multiple physical uplink control channel transmissions.

10. The UE according to claim 1, wherein, The one or more processors for receiving the request for applying the DMRS binding are configured to receive the request in a Dedicated Downlink Control Information (DCI), Physical Uplink Shared Channel Grant, Physical Downlink Shared Channel Grant, or Radio Resource Control Message.

11. The UE according to claim 1, wherein, The request indicates the time period during which the DMRS binding is to be applied, and wherein the plurality of uplink transmissions are sent during the time period.

12. The UE according to claim 11, wherein, The time period is indicated as at least one of an absolute time period, a number of time slots, or a number of uplink transmissions.

13. A network entity for wireless communication, comprising: Memory; as well as One or more processors, coupled to the memory, are configured to: Send a request to the User Equipment (UE) to bind the Demodulation Reference Signal (DMRS) for uplink transmission; Receive multiple uplink transmissions; as well as The one or more processors for receiving an indication of whether the UE can comply with the request to apply DMRS binding to the plurality of uplink transmissions are configured to: Receive a specific DMRS sequence associated with an uplink transmission among the plurality of uplink transmissions, wherein the specific DMRS sequence indicates whether the UE is able to maintain phase coherence across the uplink transmission and one or more other uplink transmissions included in the plurality of uplink transmissions.

14. The network entity according to claim 13, wherein, Whether the UE can comply with the instructions in the request indicates whether the UE can transmit with phase coherence across the multiple uplinks.

15. The network entity according to claim 13, wherein, The one or more processors are further configured to perform joint channel estimation across all or a subset of the plurality of uplink transmissions, based at least in part on whether the UE is able to comply with the instructions of the request.

16. The network entity according to claim 13, wherein, The one or more processors are further configured to: Based at least in part on the UE's ability to comply with the instructions of the request, a subset of the plurality of uplink transmissions to which joint channel estimation is to be applied is identified; as well as Joint channel estimation is performed on the subset of transmissions across the multiple uplinks.

17. The network entity according to claim 13, wherein, The one or more processors used to send the request applying the DMRS binding are configured to send the request in a Dedicated Downlink Control Information (DCI), Physical Uplink Shared Channel Grant, Physical Downlink Shared Channel Grant, or Radio Resource Control (RRC) message.

18. The network entity according to claim 13, wherein, The request indicates the time period during which the DMRS binding should be applied, and The multiple uplink transmissions are sent during the time period.

19. The network entity according to claim 18, wherein, The time period is indicated as at least one of an absolute time period, a number of time slots, or a number of uplink transmissions.

20. A method for wireless communication performed by a user equipment (UE), comprising: Receive a request to bind the demodulation reference signal DMRS for uplink transmission; Send multiple uplink transmissions; as well as The indication of whether the UE can comply with the request is sent at least in part based on whether the UE can maintain phase coherence across the plurality of uplink transmissions, wherein sending the indication of whether the UE can comply with the request includes sending a specific DMRS sequence associated with an uplink transmission among the plurality of uplink transmissions, wherein the specific DMRS sequence indicates whether the UE can maintain phase coherence across the uplink transmission and one or more other uplink transmissions included in the plurality of uplink transmissions.

21. A method for wireless communication performed by a network entity, comprising: Send a request to the User Equipment (UE) to bind the Demodulation Reference Signal (DMRS) for uplink transmission; Receive multiple uplink transmissions; as well as Receiving an indication of whether the UE can comply with the request to apply DMRS binding to the plurality of uplink transmissions, the indication of whether the UE can comply with the request includes receiving a specific DMRS sequence associated with an uplink transmission among the plurality of uplink transmissions, wherein the specific DMRS sequence indicates whether the UE can maintain phase coherence across the uplink transmission and one or more other uplink transmissions included in the plurality of uplink transmissions.

22. An apparatus for wireless communication performed by a user equipment (UE), the apparatus comprising components for performing the method of claim 20.

23. An apparatus for wireless communication performed by a network entity, the apparatus comprising components for performing the method of claim 21.

24. A computer-readable medium having program code recorded thereon, wherein the program code is executable by one or more processors of a user equipment (UE) to cause the processor to perform the method of claim 20.

25. A computer-readable medium having program code recorded thereon, wherein the program code is executable by one or more processors of a network entity to cause the processors to perform the method of claim 21.

26. A computer program product comprising computer-readable instructions that, when executed by a processor, cause the processor to perform the method of any one of claims 20 and 21.

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