Dynamic DMRS configuration for uplink transmission

Abstract

Embodiments of the present disclosure relate to an apparatus, method, and computer-readable storage medium for dynamic demodulation reference signal (DMRS) configuration for uplink transmissions. The apparatus receives at least one upper layer parameter for configuring a first DMRS configuration type and a second DMRS configuration type. The apparatus receives at least one of the following: a first indication of at least one transmission parameter associated with at least one uplink transmission, or a second indication indicating the first DMRS configuration type or the second DMRS configuration type to be applied to the at least one uplink transmission. The apparatus then determines at least one of the first or second DMRS configuration types based on the at least one of the first or second indication. The apparatus performs the at least one uplink transmission by using the determined at least one of the first or second DMRS configuration type.

Description

[Technical Field]

[0001] Various embodiments of the present disclosure relate generally to the field of telecommunications, and more particularly to a method, apparatus, and computer-readable storage medium for dynamic demodulation reference signal (DMRS) configuration for uplink transmissions. [Background technology]

[0002] In a multi-transmit / receive point (multi-TRP) deployment, the UE can support multiple transmit panels and operate using different antenna panels for different links. In multi-TRP communications, the UE may be configured to transmit and receive using multiple links, and the links may have independent nature or characteristics. However, no signaling framework exists that can support dynamic changes of uplink transmission parameters based on uplink transmission specifications. Summary of the Invention [Means for solving the problem]

[0003] In a first aspect of the present disclosure, a first device is provided, the first device comprising: at least one processor; and at least one memory storing instructions that, when executed by the at least one processor, cause the apparatus to at least do the following: receive at least one upper layer parameter for setting a first demodulation reference signal (DMRS) configuration type and a second DMRS configuration type, receive at least one of a first indication of at least one transmission parameter associated with at least one uplink transmission or a second indication of the first DMRS configuration type or the second DMRS configuration type to be applied to the at least one uplink transmission, determine at least one of the first or second DMRS configuration types based on the at least one of the first or second indication, and perform the at least one uplink transmission by using the determined at least one of the first or second DMRS configuration types.

[0004] In a second aspect of the present disclosure, a second device is provided, the second device comprising: at least one processor; and at least one memory storing instructions that, when executed by the at least one processor, cause the apparatus to at least do the following: transmit at least one upper layer parameter for setting a first demodulation reference signal (DMRS) configuration type and a second DMRS configuration type, determine at least one of the first or second DMRS configuration types for at least one uplink transmission, transmit at least one of a first indication of at least one transmission parameter associated with the at least one uplink transmission or a second indication of the first DMRS configuration type or the second DMRS configuration type to be applied to the at least one uplink transmission, and receive the at least one uplink transmission by using the determined at least one of the first or second DMRS configuration types.

[0005] In a third aspect of the present disclosure, a method is provided, including: a first device receiving at least one upper layer parameter for configuring a first demodulation reference signal (DMRS) configuration type and a second DMRS configuration type; receiving at least one of a first indication of at least one transmission parameter associated with at least one uplink transmission or a second indication indicating the first DMRS configuration type or the second DMRS configuration type to be applied to the at least one uplink transmission; determining at least one of the first or second DMRS configuration types based on the at least one of the first or second indication; and performing the at least one uplink transmission by using the determined at least one of the first or second DMRS configuration types.

[0006] In a fourth aspect of the present disclosure, a method is provided, the method including: a second device transmitting at least one upper layer parameter for configuring a first demodulation reference signal (DMRS) configuration type and a second DMRS configuration type, determining at least one of the first or second DMRS configuration types for at least one uplink transmission, transmitting at least one of a first indication of at least one transmission parameter associated with the at least one uplink transmission or a second indication of the first DMRS configuration type or the second DMRS configuration type to be applied to the at least one uplink transmission, and receiving the at least one uplink transmission by using the determined at least one of the first or second DMRS configuration type.

[0007] In a fifth aspect of the present disclosure, an apparatus is provided, comprising: means for receiving at least one upper layer parameter for configuring a first demodulation reference signal (DMRS) configuration type and a second DMRS configuration type, means for receiving at least one of a first indication of at least one transmission parameter associated with at least one uplink transmission or a second indication of the first DMRS configuration type or the second DMRS configuration type to be applied to the at least one uplink transmission, means for determining at least one of the first or second DMRS configuration types based on the at least one of the first or second indication, and means for performing the at least one uplink transmission by using the determined at least one of the first or second DMRS configuration type.

[0008] In a sixth aspect of the present disclosure, an apparatus is provided, comprising: means for transmitting at least one upper layer parameter for configuring a first demodulation reference signal (DMRS) configuration type and a second DMRS configuration type, means for determining at least one of the first or second DMRS configuration types for at least one uplink transmission, means for transmitting at least one of a first indication of at least one transmission parameter associated with the at least one uplink transmission or a second indication of the first DMRS configuration type or the second DMRS configuration type to be applied to the at least one uplink transmission, and means for receiving the at least one uplink transmission by using the determined at least one of the first or second DMRS configuration types.

[0009] In a seventh aspect of the present disclosure, there is provided a computer-readable medium comprising instructions stored thereon for causing an apparatus to perform at least the method according to the third aspect.

[0010] In an eighth aspect of the present disclosure, there is provided a computer-readable medium comprising instructions stored thereon for causing an apparatus to perform at least the method according to the fourth aspect.

[0011] It should be understood that this summary section is not intended to identify key features or essential features of the embodiments of the present disclosure, nor is it intended to be used to limit the scope of the present disclosure. Other features of the present disclosure will be readily apparent from the following description.

[0012] Some exemplary embodiments will now be described with reference to the accompanying drawings. [Brief explanation of the drawings]

[0013] [Figure 1] FIG. 1 is a diagram of an example communication environment in which example embodiments of the present disclosure may be implemented. [Figure 2] 1 is a diagram of an example structure of two DMRS configuration types, according to some example embodiments of the present disclosure. [Figure 3] 1 is an example signaling diagram of a communication process between two devices according to some example embodiments of the present disclosure. [Figure 4] 1 is a flowchart of a method according to some example embodiments of the present disclosure. [Figure 5A] 1 is a flowchart of an example process for enabling dynamic indication for DMRS configuration type, according to some example embodiments of the present disclosure. [Figure 5B] 1 is a flowchart of an example process for enabling dynamic indication for DMRS configuration type, according to some example embodiments of the present disclosure. [Figure 6] 1 is a flowchart of a method according to some example embodiments of the present disclosure. [Figure 7] FIG. 1 is a simplified block diagram of an apparatus suitable for practicing exemplary embodiments of the present disclosure. [Figure 8]1 is a block diagram of an example computer-readable medium according to some example embodiments of the present disclosure. DETAILED DESCRIPTION OF THE INVENTION

[0014] Throughout the drawings, the same or similar reference numbers represent the same or similar elements.

[0015] The principles of the present disclosure will now be described with reference to several exemplary embodiments. It should be understood that these embodiments are set forth for illustrative purposes only and to aid those skilled in the art in understanding and implementing the present disclosure, and are not intended to imply any limitation on the scope of the present disclosure. The embodiments described herein can be implemented in various ways other than those described below.

[0016] In the following description and claims, unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure belongs.

[0017] In this disclosure, references such as "one embodiment," "an embodiment," "an exemplary embodiment," and the like indicate that the described embodiment may include a particular feature, structure, or characteristic, but not all embodiments necessarily include the particular feature, structure, or characteristic. Moreover, such phrases do not necessarily refer to the same embodiment. Furthermore, when a particular feature, structure, or characteristic is described in connection with one embodiment, it is understood that it is within the knowledge of one skilled in the art that such feature, structure, or characteristic is applicable to other embodiments, whether or not explicitly described.

[0018] Although terms such as "first," "second," and the like may be used herein to describe various elements, it should be understood that these elements are not limited by these terms. These terms are used only to distinguish one element from another. For example, a first element could be termed a second element, and similarly, a second element could be termed a first element, without departing from the scope of the illustrated embodiments. As used herein, the term "and / or" includes any and all combinations of one or more of the listed terms.

[0019] As used herein, "at least one of: " and "at least one of " and similar phrases, when a list of two or more elements is joined by "and" or "or", mean at least one of the elements, or at least two or more of the elements, or at least all of the elements.

[0020] As used herein, unless expressly stated, performing a step "in response to A" does not indicate that the step is performed immediately after "A" occurs, and one or more intervening steps may be included.

[0021] The terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit example embodiments. As used herein, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly dictates otherwise. It will be further understood that the terms "comprise," "comprising," "have," "having," "include," and / or "including," as used herein, specify the presence of stated features, elements, and / or components, etc., but do not exclude the presence or addition of one or more other features, elements, components, and / or combinations thereof.

[0022] As used in this application, the term "circuitry" may refer to one or more or all of the following: (a) hardware-only circuit implementations (e.g., analog and / or digital-only implementations); (b) A combination of hardware circuitry and software, such as (if applicable): (i) a combination of analog and / or digital hardware circuitry and software / firmware; and (ii) software (including digital signal processors), portions of hardware processors with software and memory that work together to cause a device, such as a mobile phone or server, to perform various functions; and (c) A hardware circuit and / or processor, such as a microprocessor or part of a microprocessor, that requires software (e.g., firmware) to operate, but where the software may not be present when not necessary for operation.

[0023] This definition of circuit applies to all uses of the term in this application, including the claims. As a further example, as used in this application, the term circuit also covers implementations of simply a hardware circuit or processor (or processors) or portion of a hardware circuit or processor and its (or their) accompanying software and / or firmware. The term circuit also covers, for example, baseband or processor integrated circuits for mobile devices, or similar integrated circuits in servers, cellular network devices, or other computing or network devices, if applicable to certain claim elements.

[0024] As used herein, the term "communication network" refers to a network conforming to an appropriate communication standard, such as New Radio (NR), Long Term Evolution (LTE), LTE-Advanced (LTE-A), Wideband Code Division Multiple Access (WCDMA), High-Speed ​​Packet Access (HSPA), or Narrow Band Internet of Things (NB-IoT). Furthermore, communications between terminal devices and network devices in a communication network may be performed according to any appropriate generation of communication protocols, including, but not limited to, first-generation (1G), second-generation (2G), 2.5G, 2.75G, third-generation (3G), fourth-generation (4G), 4.5G, fifth-generation (5G) communication protocols, and / or other protocols now known or developed in the future. Embodiments of the present disclosure may be applied to various communication systems. Given the rapid development of communication technologies, there are certainly future communication technologies and systems in which the present disclosure may be embodied. The scope of the present disclosure should not be considered limited to only the aforementioned systems.

[0025] As used herein, the term "network device" refers to a node of a communication network through which a terminal device accesses the network and receives services therefrom. Depending on the terminology and technology applied, a network device may refer to a transmit / receive point (TRP) such as a base station (BS), an access point (AP), an NR NB (also referred to as a gNB), a remote radio unit (RRU), a radio header (RH), a remote radio head (RRH), a relay, an Integrated and Access Backhaul (IAB) node, low-power nodes such as femto and pico, satellite network devices, low Earth orbit (LEO) satellites, and geosynchronous orbit (GEO) satellites, non-terrestrial network (NTN) or non-grounded network devices such as airborne network devices, etc. In some example embodiments, a Radio Access Network (RAN) split architecture includes a centralized unit (CU) and a distributed unit (DU) in an IAB donor node. An IAB node includes a mobile terminal (IAB-MT) portion that behaves like a UE towards a parent node, and a DU portion of the IAB node that behaves like a base station towards a next-hop IAB node.

[0026] The term "terminal device" refers to any end device capable of wireless communication. By way of example and not limitation, a terminal device may also be referred to as a communication device, user equipment (UE), subscriber station (SS), portable subscriber station, mobile station (MS), mobile device, user device, or access terminal (AT). Terminal devices may include, but are not limited to, mobile phones, cellular phones, smartphones, voice over IP (VoIP) phones, wireless local loop phones, tablets, wearable terminal devices, personal digital assistants (PDAs), portable computers, desktop computers, imaging terminal devices such as digital cameras, gaming terminal devices, music storage and playback equipment, in-vehicle wireless terminal devices, wireless endpoints, mobile stations, laptop-embedded equipment (LEE), laptop-mounted equipment (LME), USB dongles, smart devices, wireless customer-premises equipment (CPE), Internet of Things (IoT) devices, watches or other wearable devices, head-mounted displays (HMDs), vehicles, drones, medical equipment and applications (e.g., remote surgery), industrial devices and applications (e.g., robots and / or other wireless devices operating in the context of industrial and / or automated processing chains), consumer electronic devices, devices operating on commercial and / or industrial wireless networks, etc. A terminal device may correspond to the mobile terminal (MT) portion of an IAB node (e.g., a relay node). In the following description, the terms "terminal device," "communication device," "terminal," "user equipment," and "UE" may be used interchangeably.

[0027] As used herein, the terms "resource," "transmission resource," "resource block," "physical resource block (PRB)," "uplink resource," or "downlink resource" may refer to any resource for performing communication, e.g., communication between a terminal device and a network device, such as a time domain resource, a frequency domain resource, a spatial domain resource, a code domain resource, or any other resource that enables communication. Hereinafter, unless explicitly stated, both frequency domain and time domain resources are used as examples of transmission resources to describe some example embodiments of the present disclosure. It should be noted that the example embodiments of the present disclosure may be applied to other resources in other domains as well.

[0028] Multiple timing advance (TA) operations per serving cell / timing advance group (TAG) may need to be supported for multiple downlink control information (multi-DCI) multi-TRP (also referred to as multiple TRP, multiple-TRP, or mTRP) operation. For example, in multi-DCI multi-TRP (also referred to as multi-DCI-based multi-TRP) operation, multiple TA values ​​may be used. The timing advance value indicates the required advancement of an uplink transmission relative to a downlink reference timing so that different transmissions from different user equipments (UEs) arrive within a time window, such as the cyclic prefix of an orthogonal frequency division multiple access (OFDM) symbol. In previous releases, the TA value could be set differently for different cells (e.g., different TA values ​​for different TAGs). In multiple TRP operation, uplink timing may be required per TRP (e.g., per uplink transmission link). In case of multi-DCI based multi-TRP operation with two TAs, it may be supported to configure two TAGs belonging to one serving cell (and / or two TA values ​​to be maintained for one serving cell, or for one serving cell and one cell with a different PCI from the serving cell).

[0029] In a multi-TRP deployment, as an example, a UE may support multiple transmit panels and may operate using different antenna panels for different links (e.g., enabling simultaneous multi-panel / multi-beam transmissions). Alternatively, the UE may operate with one antenna panel but use different beams per panel for different uplinks. A UE may have separate links with different path losses (e.g., due to distance) towards different TRPs.

[0030] A unified transmission configuration indicator (TCI) framework is introduced in Release 17 (Rel-17). In the unified TCI framework, the TCI state, which previously provided quasi-co-located (QCL) specifications for reception of downlink (DL) signals and channels, is also used to provide spatial sources for transmission of uplink (UL) signals and channels. Furthermore, the unified TCI framework defines the concept of an indicated TCI state. An indicated TCI state can be a joint DL and UL TCI state or a separate DL and separate UL TCI state. An indicated TCI state provides QCL sources (DL) and spatial sources (UL) for one set of downlink signals and channels and one set of uplink signals and channels, respectively. In Rel-17, there can be one indicated joint DL and UL TCI state or one indicated DL TCI state and one indicated UL TCI state for a UE.

[0031] In the unified TCI framework, one or more TCI state IDs can be configured / indicated for a set of signals and channels at a time, which may be a joint DL / UL TCI state, a separate DL TCI state, or a separate UL TCI state. The indicated TCI state may include a TCI state ID designated to be used as a joint DL / UL, DL, and / or UL TCI state. One or more TCI state IDs may be configured / indicated to be one or more indicated TCI states (e.g., a first indicated TCI state or a second indicated TCI state). A set of joint and / or separate TCI states (or a pool or list thereof) may be configured via Radio Resource Control (RRC) signaling. Several (e.g., eight) joint and / or separate TCI states may be activated via Media Access Control (MAC) signaling, such as a control element (CE).

[0032] One of the activated TCI states (list of TCI state IDs) may be indicated to be applied via a DCI. Such a TCI state may also be referred to as an indicated TCI state (i.e., a TCI state ID may be considered as an indicated TCI state ID). If there is only one activated TCI state, instead of an indication via a DCI of which TCI state is applied, the TCI state activated by the MAC CE may be considered as the currently applied TCI state or the currently indicated TCI state.

[0033] DCI format 1_1 / 1_2 with or without DL allocation can be used to carry TCI state indication. The indication may be acknowledged by a Hybrid Automatic Repeat Request (HARQ) acknowledgement (ACK) from the UE. The application time of the TCI state indication may be at least X milliseconds or the first slot of Y symbols after the last symbol of the acknowledgement of the joint or separate DL / UL TCI state indication. The codepoint in the TCI field can indicate both the joint TCI state of DL and UL, a pair of DL TCI state and UL TCI state, or a DL TCI state (preserve current UL TCI state) or a UL TCI state (preserve current DL TCI state).

[0034] New Radio (NR) can support two different configuration types of DMRS, referred to as Type 1 (type-1) and Type 2 (or type-2), respectively. Configuration Type 1 has a so-called comb-2 structure, which means that every second resource element (RE) in a configured physical resource block (PRB) is assigned to the antenna port associated with the corresponding resource. As a result, antenna ports are multiplexed in the frequency domain, and antenna ports sharing the same resource element are differentiated using an orthogonal cover code (OCC), which enables code division multiple access (CDM). Type 1 supports four antenna ports per symbol and up to eight antenna panels (APs) in double-fronted symbols. Type 1 DMRS can be configured even in poor / limited coverage conditions.

[0035] In a Type 2 configuration, every three pairs of subcarriers are assigned to the antenna port associated with the corresponding resource element in the configured PRB. Type-2 supports six antenna ports per symbol, and up to 12 APs in double-fronted symbols. Compared to Type-1, Type-2 can be used for less challenging channel conditions (allowing for higher multiplexing capabilities).

[0036] In Release 17, multiple TRP operation was defined only for the downlink. Multiple TRP operation needs to be extended for the uplink. In multiple TRP communication, a UE may configure transmission and reception using multiple links, and the links may have independent properties or characteristics. One of these characteristics is the distance (which directly affects the signal propagation time) and channel conditions of a particular link. For example, in a typical system using multiple beams for operation, a link may be considered power-limited instead of interference-limited. Therefore, if power is limited, the link distance / path loss may affect the required uplink transmission characteristics.

[0037] Signal propagation time may be considered to be addressed by introducing multiple TA values. For example, different links may have different propagation delays (due to distance) and may operate using different TA values. The TA values ​​can be updated by the network in a dynamic manner. However, another issue related to multi-TRP is demodulation reference signal (DMRS)-based channel estimation. Different links may require different DMRS configuration types, possibly depending on the TRP used for that link. In addition, a link to a TRP may be switched towards a further TRP, which may have different transmission characteristics (e.g., different path losses) for uplink transmissions. A transmission switch may mean that the UE receives an indication of a new TCI state ID, which is set / indicated as the indicated TCI state; therefore, the DMRS configuration type is beneficial for dynamic switching capabilities (especially in multiple TRP deployments).

[0038] The current signaling framework cannot support dynamic changes of uplink transmission parameters based on uplink transmission characteristics. One key challenge concerns the uplink DMRS used for uplink channel estimation. NR 5G DMRS configuration supports two different values ​​(Type 1 and Type 2) to suit various channel conditions. Type 1 is considered more robust compared to Type 2 due to RS density. However, Type 1 configuration limits the multiplexing capability of different UEs due to RS density. Therefore, the preferred or optimal configuration depends on the UL transmission characteristics of the link. Therefore, static values ​​(or RRC-configured values) may limit the network scheduling flexibility, which may reduce resource utilization efficiency and cause unnecessary delays for uplink beam changes if RRC-level reconfiguration is required before the beam change.

[0039] Another example of such a parameter that may be dynamically changed is DMRS mapping to a particular symbol within a slot. For example, a downlink message (e.g., DCI or MAC CE) may indicate the DMRS symbol mapping type to PUSCH resources (e.g., mapping type A or B, or dmrs-UplinkForPUSCH-MappingTypeA or dmrs-UplinkForPUSCH-MappingTypeB) on a transmission-by-transmission basis (e.g., in the DCI) or in a semi-static manner (e.g., in the MAC CE for a particular TCI state or indicated TCI state). In one example, the DMRS configuration type and DMRS for PUSCH mapping type may be dynamically indicated / changed. In one example, dmrs-UplinkForPUSCH-MappingTypeA / B may refer to a DMRS symbol position within a slot.

[0040] Example embodiments of the present disclosure propose an enhanced scheme for supporting dynamic changes of uplink transmission parameters in a multi-TRP deployment. The scheme enables a device (e.g., a UE) to determine one or more DMRS configuration types (e.g., Type 1 and / or Type 2) for one or more uplink transmissions based on a dynamic indication from the network. In some examples, the scheme enables a device to determine one or more DMRS configuration types for downlink reception. The DMRS configuration type is determined from multiple DMRS configuration types configurable via RRC signaling. The dynamic indication includes a first indication of at least one transmission parameter associated with the uplink transmission and / or a second indication of one DMRS configuration type (either Type 1 or Type 2) to be applied to the uplink transmission.

[0041] In this way, the DMRS configuration type to be used can be dynamically indicated and determined. Different numbers of resource elements can be used for the first and second DMRS configuration types, which allows for efficient UL operation. This allows for more scheduling flexibility while achieving more efficient transmission resource utilization. In some embodiments, the DMRS configuration type may also be referred to as the configuration type.

[0042] In some example embodiments, a similar method can be applied to downlink DMRS (used for downlink transmission and reception by a UE). The network (e.g., TRP / gNB) can indicate in a downlink message that a particular DMRS configuration or configuration type may be used for demodulation purposes of a scheduled physical downlink shared channel (PDSCH). This indication can be provided, for example, in a DCI message scheduling a PDSCH transmission.

[0043] 1 is a diagram of an example communication environment 100 in which example embodiments of the present disclosure may be implemented. In the communication environment 100, multiple communication devices, including four devices 110, 120, 130, and 135, may communicate with one another. In some embodiments, the devices 110, 120, 130, and 135 are referred to as a first device 110, a second device 120, a third device 130, and a fourth device 140, respectively. In this example, the first device 110, which may be a terminal device, may simultaneously communicate with two or more of the second device 120, the third device 130, and the fourth device 135, which may be network devices such as a TRP or a gNB.

[0044] 1 is for illustrative purposes only, without implying any limitation. Communication environment 100 may include any suitable number of devices configured to implement example embodiments of the present disclosure.

[0045] For purposes of explanation, some exemplary embodiments are described below where the first device 110 operates as a terminal device, and the second device 120 and the third device 130 operate as network devices (e.g., TRPs). However, in some exemplary embodiments, operations described with respect to a terminal device may be implemented in a network device or other device, and operations described with respect to a network device may be implemented in a terminal device or other device.

[0046] In some example embodiments, if the first device 110 is a terminal device and the second device 120, 130, or 140 is a network device, the link from the second device 120 or the third device 130 to the first device 110 is referred to as a downlink (DL), and the link from the first device 110 to the second device 120 or the third device 130 is referred to as an uplink (UL). If the first, second, and third devices 110, 120, and 130 are all terminal devices, the link between these devices is referred to as a sidelink (SL).

[0047] Communications in communication environment 100 may be implemented according to any suitable communications protocol, including, but not limited to, cellular communications protocols such as first generation (1G), second generation (2G), third generation (3G), fourth generation (4G), fifth generation (5G), sixth generation (6G), wireless local network communications protocols such as Institute of Electrical and Electronics Engineers (IEEE) 802.11, and / or other protocols now known or developed in the future. Moreover, communications may utilize any suitable wireless communications technology, including, but not limited to, code division multiple access (CDMA), frequency division multiple access (FDMA), time division multiple access (TDMA), frequency division duplex (FDD), time division duplex (TDD), multiple input multiple output (MIMO), orthogonal frequency division multiple access (OFDM), discrete Fourier transform spread OFDM (DFT-s-OFDM), and / or other technologies now known or developed in the future.

[0048] Some example embodiments may be implemented in an example scenario of multi-DCI-based multi-TRP operation. For example, a first device 110 (e.g., a UE) may perform simultaneous transmissions to two or more of second, third, and fourth devices 120, 130, and 135 (e.g., TRPs) via multiple channels, e.g., via physical uplink shared channels (PUSCHs) or physical downlink shared channels (PDSCHs) 140, 145, and / or 150.

[0049] The first device 110 may be equipped with multiple APs 152, 154, and 156 and may use each of the APs 152, 154, or 156 to communicate with the second device 120, 130, or 135. It should be understood that different APs are shown for different links for illustrative purposes only, and no limitation is intended to be implied. Alternatively, or in addition, the first device 110 may use different antenna ports or beams for different links at one AP.

[0050] In some example embodiments, when the first device 110 is configured with multiple control resource set (CORESET) pool index (also referred to as CORESETpoolindex) values ​​and / or configured with multiple TA operations for multiple TRP communications, the first device 110 may be configured with multiple DMRS configuration types, including, for example, a first DMRS configuration type and a second DMRS configuration type. Different DMRS types have different densities, such as different numbers of resources. In some examples, the methods / schemes herein may be used for S-DCI (single-DCI)-based multi-TRP and for any transmission scheme (e.g., for single-TRP) where a dynamic DMRS configuration type indication is required.

[0051] FIG. 2 is a diagram of an example structure of two DMRS configuration types, in accordance with some example embodiments of the present disclosure.

[0052] The first DMRS configuration type 205 may be configuration type 1 in which every second RE 210 in a configured PRB 215 is assigned to an antenna port associated with the corresponding resource. The second DMRS configuration type 220 may be configuration type 2 in which every third pair of subcarriers 225 is assigned to an antenna port associated with a corresponding RE in a configured PRB 230. Thus, the first DMRS configuration type may be more robust due to RE density compared to the second DMRS configuration type.

[0053] Different links may require different DMRS configuration types, possibly depending on distance or mobility. In this example, as shown in FIG. 1, due to mobility, link 145 to device 130 may be switched toward device 135, which may have different transmission characteristics (e.g., different path loss). In various embodiments of the present disclosure, one or more DMRS configuration types used by first device 110 may be dynamically indicated or associated via transmission parameters for a particular uplink transmission.

[0054] FIG. 3 is an example signaling diagram of a communication process 300 between a first device 110 and a second device 120, according to some example embodiments of the present disclosure.

[0055] As shown in FIG. 3, a first device 110, which may be a UE, may receive 305 higher layer parameters including a DMRS configuration type from a second device 120, which may be a network node.

[0056] The first device 110 may also receive 310 one or more dynamic indications associated with one or more DMRS configuration types from the second device 120. The dynamic indication may include a first indication of at least one transmission parameter, which may include an indication of a TCI state identification (ID) via a MAC CE. Alternatively, or in addition, the dynamic indication may include a second indication indicating whether the first, second, or other DMRS configuration types should be applied among the configured DMRS configuration types. The second indication may be transmitted via an UL grant within the DCI.

[0057] The first device 110 may determine 315 the DMRS configuration type from the configured DMRS configuration types based on at least one of the first or second indication, e.g., based on an association of the DMRS configuration type with a TCI state ID or based on an UL grant (e.g., a DCI indication). As an example, the DMRS configuration type to be used for a scheduled uplink transmission among multiple configuration types may be based on an indication in the DCI scheduling the PUSCH transmission of whether the first configuration type or the second configuration type applies to the DMRS of the scheduled PUSCH.

[0058] Alternatively or additionally, the indication TCI ID and / or the TCI state ID set as the indication TCI state may be used to determine a DMRS configuration type for the scheduled PUSCH transmission. The device (320) may then apply the determined DMRS configuration to the PUSCH transmission to perform the PUSCH transmission (325). This may be applied to the PDSCH reception in a symmetric manner.

[0059] In this specification, an "indication TCI state" can be considered as a container / variable that takes on values ​​of different TCI state IDs. For example, a first indication TCI state (e.g., index #0) can carry {TCI state ID x}, and a second indication TCI state (e.g., index #1) can carry {TCI state ID y}. When a specific DMRS configuration type is associated with a first indication TCI state, any TCI state ID x set as the first indication TCI state is associated with that specific DMRS configuration type, regardless of what the TCI state IDs x and y are. The same applies to the use of a second indication TCI state. A specific DMRS configuration type can be determined by using a parameter (e.g., a TCI state ID) set in the container / variable of the first or second indication TCI state. When a specific DMRS configuration type is associated with TCI state ID x or y, this means that the DMRS configuration type is determined based on the value associated with ID x or y, but not based on the "container / variable" mentioned above.

[0060] It should be understood that the acts or actions illustrated in Figure 3 are exemplary only and are not limiting. An act or action may be divided into multiple acts or actions, or some acts or actions may be combined into one step. Additionally, other acts or actions may be present.

[0061] FIG. 4 illustrates a flowchart of an example method 400 implemented in the first device 110, according to some example embodiments of the present disclosure.

[0062] At block 410, first device 110 receives at least one higher layer parameter that configures a first DMRS configuration type and a second DMRS configuration type, and the higher layer parameter may further configure other DMRS configuration types depending on network configuration.

[0063] For example, the first device 110 (e.g., a UE) may be configured with one or more (or multiple) PUSCH configurations. Such PUSCH configurations may be dedicated to portions of the uplink bandwidth. Each of the PUSCH configurations may include a configuration of a DMRS configuration type.

[0064] When multiple PUSCH configurations are configured for the first device 110, the additional configuration (e.g., second or #2) may be a delta configuration relative to the first PUSCH configuration or the default #1 configuration. The delta configuration may signal only the parameters that differ between the first configuration (basic configuration) and the second configuration (delta). For example, if the configurations have many similar parameters, only the parameters that differ are signaled. The additional configuration may include a second value for a DMRS configuration type that is associated with a particular DMRS symbol to PUSCH resource mapping type (e.g., mapping type A or B).

[0065] Alternatively or additionally, the PUSCH configuration may have an additional or second configuration for the DMRS mapping type to PUSCH transmission symbols, such as parameters dmrs-UplinkForPUSCH-MappingTypeA and dmrs-UplinkForPUSCH-MappingTypeA_additional.

[0066] As another example, the first device 110 may receive a PUSCH configuration that instructs or configures the first device 110 with multiple (candidate) values ​​of DMRS configuration type for a particular DMRS symbol to PUSCH transmission symbol mapping. In some example embodiments, the DMRS configuration type setting may be DMRS configuration type (1+2), indicating that there are two candidate values ​​for DMRS configuration type for PUSCH transmission with a particular type of DMRS mapping to PUSCH transmission symbols. The two candidate values ​​are given as an example. In one example, DMRS configuration type x may indicate that multiple values ​​may be instructed to be used as the DMRS configuration type (e.g., up to N values).

[0067] In block 420, the first device 110 receives at least one of the following: a first indication of at least one transmission parameter associated with the at least one uplink transmission, or a second indication indicating a first DMRS setting type or a second DMRS setting type to be applied to the at least one uplink transmission.

[0068] In some example embodiments, the at least one transmission parameter may be pre-associated with one or more DMRS configuration types. In some example embodiments, the first device 110 may receive a configuration of an association between the first and / or second DMRS configuration types and the at least one transmission parameter. The association may be configured by RRC signaling or MAC CE (or DCI). The first indication associated with the transmission parameter may be received via one of the RRC signaling, MAC CE, or DCI.

[0069] For example, first device 110 may receive the RRC configuration association and receive an indication of the associated parameters via a MAC CE or a DCI. Alternatively, or in addition, first device 110 may receive the configuration related to the association via a MAC CE and receive an indication of the associated parameters via a DCI.

[0070] The associated parameters may include a TCI state ID, an indicated TCI state (e.g., index #0 or #1), a reference signal (RS) or a list or multiple RSs, a scheduling offset, a timing advance (TA), a CORESET pool index value or a CORESET group index value, a DMRS mapping type, a physical cell identifier (PCI), etc. Based on the configured association between a particular DMRS configuration type and the indicated parameters, it may be determined that a particular DMRS configuration type is to be used.

[0071] A second indication of which DMRS configuration type should be applied may be received via a DCI, which may schedule whether the first configuration type or the second configuration type is applied to the DMRS of the scheduled PUSCH.

[0072] Alternatively, a DCI that does not schedule an UL transmission (e.g., without a data grant) can be used to trigger the DMRS configuration type value used for the associated PUSCH transmission, for example, based on the CORESETpoolindex / CORESETgroup index value / ID (e.g., CORESETgroupindex). For example, how the DMRS configuration type is applied may depend on the CORESETpoolindex / CORESETgroupindex. UL transmissions scheduled using a CORESET of a particular pool index can use the indicated DMRS type.

[0073] Alternatively, such a DCI can trigger a DMRS configuration type value based on the indicated TCI state used to schedule the DCI. As an example, if a DCI that schedules a PUSCH transmission uses an indicated TCI state, a specific value associated with the indicated TCI state (or TCI state ID) is used for the scheduled uplink transmission (first or second indicated TCI state). Alternatively, or in addition, such an indication can be used to semi-permanently trigger DMRS association. UL transmissions that occur after a DCI indication can follow the indicated type.

[0074] In block 430, the first device 110 determines at least one of the first or second DMRS configuration types based on at least one of the first or second indications. The use of the first and second indications may be based on predefined or configured rules.

[0075] The DMRS configuration type applied or used may depend on the indicated TCI state. In some example embodiments, the first or second DMRS configuration type may be determined based on the type configured or associated with the indicated TCI state. The first or second DMRS configuration type may be applied to the TCI state ID configured as the indicated TCI state. For example, if there is a configured or indicated association with the first or second indicated TCI state (or #0 and #1), the first device 110 may use the DMRS configuration type associated with the first and second indicated TCI states, regardless of the actual TCI state ID.

[0076] In this case, the configuration type is associated with the indicated TCI state. The TCI state ID may change. For example, the TCI state ID configured as the indicated TCI state may change, but the DMRS configuration type is derived from the TCI state ID associated with the indicated TCI state. Therefore, for an indicated TCI state, the DMRS configuration type can be either 1 or 2 based on dynamic indication. In multi-TRP (or mTRP) operation, dynamic operation may bring more advantages because the TRPs may change in a fairly dynamic manner.

[0077] In some example embodiments, the association may be provided in the configuration of a TCI state ID (rather than associating a DMRS configuration type with an indicated TCI state). Based on the association between a TCI state ID and a first DMRS configuration type, the first device 110 may determine an initial DMRS configuration type upon receiving a first indication of a TCI state ID. As an example, for one or more particular TCI states, the first device 110 may apply either a first or second DMRS configuration type depending on which TCI state is indicated to be the indicated (unified) TCI state. In one example, the currently indicated TCI states may have the same DMRS configuration type or different DMRS configuration types.

[0078] Alternatively, or in addition, the DMRS configuration type may be determined based on the scheduling offset of the uplink transmission. In some example embodiments, if the first DMRS configuration type (or a default DMRS configuration type) is configured to be associated with a scheduling offset being less than a threshold offset (which may be set or indicated depending on the network implementation), the first device 110 may determine the first DMRS configuration type upon receiving a first indication of a scheduling offset being less than the threshold offset. For example, if the scheduling offset of the PUSCH transmission is less than a configured threshold offset value (such as a K value defined within a slot), the first device 110 may apply the default DMRS configuration type. The default value may be the first DMRS configuration type value (instead of an additional DMRS configuration type value, or the default value may be fixed in the specification, or may be any of the first, second, or Nth type values).

[0079] The DMRS configuration type (e.g., Type 1 or Type 2) applied for an uplink transmission may depend on the TA value associated with / applying to the transmission. In some example embodiments, if a first DMRS configuration type is configured to be associated with a TA having a value greater than or equal to a first threshold time value and less than a second threshold value, the first device 110 may determine the first DMRS configuration type upon receiving a first indication of such a TA.

[0080] As an example, if TA≧0 (TA=0 may mean that TA is not used and the UE may be cell-centered or the cell may be small (TA>0)), but is less than TA-threshold-for-DMRStype, then the first configuration type (e.g., Type 1) may be used (as Type 2, which is less robust but has high multiplexing capability). Otherwise, the second configuration type is used. In this example, the first threshold time value is 0 and the second threshold time value is TA-threshold-for-DMRStype. Other threshold time values ​​may be used depending on the network implementation.

[0081] In some example embodiments, the dynamic indication of the DMRS configuration type may be configured separately for PUSCH DMRS mapping type A or B. In some example embodiments, the DMRS configuration type may be specific to the PCI value associated with the RS or source RS in the TCI state. The association to the PCI may be configured.

[0082] In some example embodiments, the first device 110 may receive configurations for one or more lists of reference signals with which the use of a particular DMRS type is associated. For example, if two sets (or lists) of reference signals are associated with first and second configuration types, respectively, the associated first configuration type may be used for the first set (or list) of reference signals, and the associated second configuration type may be used for the second set (or list) of reference signals. If the reference signal to be used is not listed in the first or second list (or set), a default value for the configuration type may be used. The default value may be predefined.

[0083] The reference signal may be indicated by a reference signal of the indicated TCI state, or an SRS resource indicator associated with the PUSCH transmission, or a QCL source / spatial relationship of the indicated TCI state / SRS. The reference signals of the first and / or second lists may be compared with the indicated reference signal. If the RS associated with the PUSCH transmission matches the first or second list, the associated DMRS configuration type may be used for the PUSCH transmission.

[0084] In some example embodiments, if the first device 110 receives both a first indication of transmission parameters and a second indication of the DMRS configuration type being used, the first device 110 may select the first DMRS configuration type according to the second indication. For example, after the associated transmission parameters are configured via RRC signaling or indicated via a MAC CE or a preceding DCI, the network may change the scheduling of the DMRS configuration type and indicate the currently used DMRS configuration type via the subsequent DCI. This may provide additional flexibility.

[0085] In block 440, the first device 110 performs at least one uplink transmission by using at least one of the determined first or second DMRS configuration types. In some example embodiments, two simultaneous uplink transmissions may be performed based on at least one of the first and second DMRS configuration types. The simultaneous UL transmissions may use multiple antenna panels and may use multiple beams per panel.

[0086] As an example, the first device 110 may be scheduled with two PUSCH transmission opportunities for simultaneous PUSCH transmission from two antenna panels in a spatial division multiple access (SDM) manner. The first device 110 may determine a DMRS configuration type for the first PUSCH opportunity based on an RRC configuration and may determine a DMRS device 110 type for the second PUSCH opportunity from a dynamic indication included in a DCI that triggers or schedules the PUSCH transmission opportunity.

[0087] If a dynamic DMRS configuration type is configured for the first device 110 but no indication via DCI or MAC CE, or association via TCI state, is provided, the first device 110 may assume a default value for the DMRS configuration type. In some example embodiments, the first device 110 may perform further uplink transmissions based on the default DMRS configuration type without at least one of the first or second indication. The default value is a value predefined for the cell. Alternatively, or in addition, the default value may be PCI-dependent or PCI-specific.

[0088] An example dynamic indication process for DMRS configuration type is described below with reference to FIGS. 5A and 5B.

[0089] FIG. 5A illustrates an example process 500 in which a MAC CE is used to enable dynamic indication in some example embodiments of the present disclosure.

[0090] In the process 500, multiple PUSCH configurations, or multiple dmrs-UplinkForPUSCH-MappingTypes, are provided by RRC to the first device 110 and associated with a TCI state ID or an indicated (unified) TCI state for each uplink transmission.

[0091] As shown in FIG. 5A , at block 505, the first device 110 may receive one or more PUSCH configurations (e.g., #1, or #1 and #2) or may receive one or more configurations for dmrs-UplinkForPUSCH-MappingType (A or B). For the provided PUSCH configurations or dmrs-UplinkForPUSCH-MappingTypes, the first device 110 may determine multiple different values ​​for the DMRS configuration type. At block 515, the first device 110 may receive a MAC CE indicating DMRS configuration type 1 or 2 or associating DMRS configuration type 1 or 2 with an indicated TCI state (e.g., a first joint or UL TCI state or a second joint or UL TCI state). At block 520, for a scheduled PUSCH transmission, the first device 110 may apply the associated DMRS configuration type value associated with the TCI state used for the PUSCH transmission.

[0092] FIG. 5B illustrates an example process 530 in which DCI is used to enable dynamic indication in some example embodiments of the present disclosure.

[0093] In process 530, the DCI signaling may indicate which DMRS configuration type is to be used for the scheduled PUSCH transmission.

[0094] 5B, in block 535, the first device 110 may receive a PUSCH configuration (or multiple PUSCH configurations) with multiple values ​​for different DMRS configuration types. For the provided PUSCH configuration, in block 540, the first device 110 may determine multiple different candidate values ​​for the DMRS configuration type that correspond to a particular type of DMRS mapping type. In block 545, the first device 110 may determine a DMRS configuration type value to be used for the current PUSCH transmission based on an indicated value of the DMRS configuration type in the DCI scheduling the PUSCH transmission. In block 550, for the scheduled PUSCH transmission, the first device 110 may apply the associated DMRS configuration type value indicated by one or more PUSCH configurations.

[0095] 6 shows a flowchart of an example method 600 implemented in second device 120, third device 130, or fourth device 135, according to some example embodiments of the present disclosure. For purposes of discussion, method 600 will be described from the perspective of second device 120 of FIG. 1.

[0096] At block 610, the second device 120 transmits at least one upper layer parameter that configures the first DMRS configuration type and the second DMRS configuration type. At block 620, the second device 120 determines at least one of the first or second DMRS configuration type for at least one uplink transmission. At block 630, the second device 120 transmits at least one of the following: a first indication of at least one transmission parameter associated with the at least one uplink transmission, or a second indication of the first or second DMRS configuration type that applies to the at least one uplink transmission. At block 640, the second device 120 receives the at least one uplink transmission by using the determined at least one of the first or second DMRS configuration type.

[0097] In some example embodiments, the second device 120 may transmit a configuration of an association between the first and / or second DMRS configuration type and at least one transmission parameter.

[0098] In some example embodiments, the at least one transmission parameter may include at least one of the following: a transmission configuration indicator (TCI) state identification (ID), an indicated TCI state, a reference signal, a scheduling offset, a timing advance, a control resource set (CORESET) pool index value or a CORESET group index value, a DMRS mapping type, or a physical cell identifier.

[0099] In some example embodiments, if the determined at least one of the first or second DMRS configuration types is configured or associated with an indication TCI state, the indication TCI state may be transmitted, and the first or second DMRS configuration type may be applied to the TCI state ID configured as the indication TCI state.

[0100] In some example embodiments, if a first DMRS configuration type is determined, a TCI state ID associated with the first DMRS configuration type may be transmitted.

[0101] In some example embodiments, if a first DMRS configuration type is determined, a first indication of a scheduling offset that is less than a threshold offset may be transmitted.

[0102] In some example embodiments, if a first DMRS configuration type is determined, a first indication of a timing advance greater than or equal to a first threshold time value and less than a second threshold may be transmitted.

[0103] In some example embodiments, the first indication may be transmitted via one of RRC signaling, MAC CE, or DCI, and / or the second indication may be transmitted via DCI or MAC CE.

[0104] In some example embodiments, the at least one uplink transmission may include two simultaneous uplink transmissions based on at least one of the first and second DMRS configuration types.

[0105] In some example embodiments, the second device 120 may receive further uplink transmissions based on the default DMRS configuration type of the first and second DMRS configuration types without using at least one of the first or second indications.

[0106] In some example embodiments, an apparatus capable of performing method 400 (e.g., first apparatus 110 of FIG. 1 ) may comprise means for performing each operation of method 400. The means may be implemented in any suitable form. For example, the means may be implemented in a circuit or a software module. The apparatus may be implemented as or included in first apparatus 110 of FIG. 1 .

[0107] In some example embodiments, an apparatus comprises: means for receiving at least one upper layer parameter for setting a first demodulation reference signal (DMRS) configuration type and a second DMRS configuration type; means for receiving at least one of a first indication of at least one transmission parameter associated with at least one uplink transmission or a second indication indicating the first DMRS configuration type or the second DMRS configuration type to be applied to the at least one uplink transmission; means for determining at least one of the first or second DMRS configuration types based on the at least one of the first or second indication; and means for performing the at least one uplink transmission by using the determined at least one of the first or second DMRS configuration type.

[0108] In some example embodiments, the apparatus further comprises means for receiving a configuration of an association between the first and / or second DMRS configuration type and at least one transmission parameter.

[0109] In some example embodiments, the at least one transmission parameter includes at least one of the following: a transmission configuration indicator (TCI) state identification (ID), an indicated TCI state, a reference signal, a scheduling offset, a means for timing advance, a control resource set (CORESET) pool index value or a CORESET group index value, a DMRS mapping type, or a physical cell identifier.

[0110] In some example embodiments, the first or second DMRS configuration type is determined based on the type configured or associated with the indicated TCI state, and the first or second DMRS configuration type is applied to the TCI state ID configured as the indicated TCI state.

[0111] In some example embodiments, the means for determining the first or second DMRS configuration type comprises means for determining, in response to receiving the TCI state ID, the first DMRS configuration type based on an association between the TCI state ID and the first DMRS configuration type.

[0112] In some example embodiments, the means for determining the first or second DMRS configuration type comprises means for, in response to receiving a first indication of a scheduling offset, determining the first DMRS configuration type if the scheduling offset is less than a threshold offset.

[0113] In some example embodiments, the means for determining the first or second DMRS configuration type comprises means for determining the first DMRS configuration type in response to receiving a first indication of a timing advance if the timing advance value is greater than or equal to a first threshold time value and less than a second threshold time value.

[0114] In some example embodiments, the means for determining the first or second DMRS configuration type comprises means for, in response to receiving the first and second indications, determining the first DMRS configuration type based on the second indication.

[0115] In some example embodiments, the first indication is received via one of radio resource control (RRC) signaling, a media access control (MAC) control element (CE), a downlink control information (DCI), and / or the second indication is received via a DCI or a MAC CE.

[0116] In some example embodiments, the at least one uplink transmission includes two simultaneous uplink transmissions based on at least one of the first and second DMRS configuration types.

[0117] In some example embodiments, the apparatus further comprises means for performing a further uplink transmission based on the default DMRS configuration type without at least one of the first or second indication.

[0118] In some example embodiments, the apparatus further comprises means for performing method 400 or other operations in some example embodiments of first device 110. In some example embodiments, the means comprises at least one processor and at least one memory that stores instructions that, when executed by the at least one processor, cause execution of the apparatus.

[0119] In some example embodiments, an apparatus capable of performing method 600 (e.g., second apparatus 120 of FIG. 1 ) may include means for performing each operation of method 600. The means may be implemented in any suitable form. For example, the means may be implemented in a circuit or a software module. The apparatus may be implemented as second apparatus 120 of FIG. 1 or may be included in second apparatus 120.

[0120] In some example embodiments, an apparatus comprises: means for transmitting at least one upper layer parameter for setting a first demodulation reference signal (DMRS) configuration type and a second DMRS configuration type; means for determining at least one of the first or second DMRS configuration types for at least one uplink transmission; means for transmitting at least one of a first indication of at least one transmission parameter associated with the at least one uplink transmission or a second indication indicating the first DMRS configuration type or the second DMRS configuration type to be applied to the at least one uplink transmission; and means for receiving the at least one uplink transmission by using the determined at least one of the first or second DMRS configuration type.

[0121] In some example embodiments, the apparatus further comprises means for transmitting a configuration of an association between the first and / or second DMRS configuration type and at least one transmission parameter.

[0122] In some example embodiments, the at least one transmission parameter includes at least one of the following: a transmission configuration indicator (TCI) state identification (ID), an indicated TCI state, a reference signal, a scheduling offset, a means for timing advance, a control resource set (CORESET) pool index value or a CORESET group index value, a DMRS mapping type, or a physical cell identifier.

[0123] In some example embodiments, if the determined at least one of the first or second DMRS configuration types is configured or associated with an indication TCI state, an indication TCI state may be transmitted, and the first or second DMRS configuration type applies to the TCI state ID configured as the indication TCI state.

[0124] In some example embodiments, if a first DMRS configuration type is determined, a TCI state ID associated with the first DMRS configuration type is transmitted.

[0125] In some example embodiments, if a first DMRS configuration type is determined, a first indication of a scheduling offset that is less than a threshold offset is transmitted.

[0126] In some example embodiments, if a first DMRS configuration type is determined, a first indication of a timing advance greater than or equal to a first threshold time value and less than a second threshold is transmitted.

[0127] In some example embodiments, the first indication is transmitted via one of Radio Resource Control (RRC) signaling, a Media Access Control (MAC) control element (CE), a Downlink Control Information (DCI), and / or the second indication is transmitted via a DCI or a MAC CE.

[0128] In some example embodiments, the at least one uplink transmission includes two simultaneous uplink transmissions based on at least one of the first and second DMRS configuration types.

[0129] In some example embodiments, the apparatus further comprises means for receiving a further uplink transmission based on a default DMRS configuration type of the first and second DMRS configuration types without using at least one of the first or second indication.

[0130] In some example embodiments, the apparatus further comprises means for performing other operations of method 600 or some example embodiments of second device 120. In some example embodiments, the means comprises at least one processor and at least one memory that stores instructions that, when executed by the at least one processor, cause execution of the apparatus.

[0131] 7 is a simplified block diagram of an apparatus 700 suitable for practicing an exemplary embodiment of the present disclosure. The apparatus 700 may be provided to implement a communications device such as the first apparatus 110, or the second apparatus 120, the third apparatus 130, or the fourth apparatus 135 as shown in FIG. 1. As shown, the apparatus 700 includes one or more processors 710, one or more memories 720 coupled to the processor 710, and one or more communications modules 740 coupled to the processor 710.

[0132] The communications module 740 is for two-way communication. The communications module 740 includes one or more communications interfaces to facilitate communication with one or more other modules or devices. The communications interfaces may represent any interface necessary for communication with other network elements. In some exemplary embodiments, the communications module 740 may include at least one antenna.

[0133] The processor 710 may be of any type suitable for a local technology network and may include, by way of non-limiting example, one or more of the following: a general-purpose computer, an application-specific computer, a microprocessor, a digital signal processor (DSP), and a processor based on a multi-core processor architecture. The device 700 may have multiple processors, such as application-specific integrated circuit chips, time-synchronized to a clock that synchronizes the main processor.

[0134] The memory 720 can include one or more nonvolatile memories and one or more volatile memories. Examples of nonvolatile memory include, but are not limited to, read-only memory (ROM) 724, electrically programmable read-only memory (EPROM), flash memory, hard disks, compact disks (CDs), digital video disks (DVDs), optical disks, laser disks, and other magnetic and / or optical storage devices. Examples of volatile memory include, but are not limited to, random access memory (RAM) 722 and other volatile memory that is not retained during power down periods.

[0135] The computer program 730 includes computer-executable instructions that are executed by the associated processor 710. The instructions of the program 730 may include instructions for performing the operations / acts of some example embodiments of the present disclosure. The program 730 may be stored in a memory, such as the ROM 724. The processor 710 can load the program 730 into the RAM 722 to perform any suitable operations and processes.

[0136] The exemplary embodiments of the present disclosure may be implemented by means of a program 730 such that the apparatus 700 may perform any process of the present disclosure such as those discussed with reference to Figures 1 through 6. The exemplary embodiments of the present disclosure may be implemented by hardware or by a combination of software and hardware.

[0137] In some exemplary embodiments, the program 730 may be physically contained in a computer-readable medium that may be included in the apparatus 700 (such as in memory 720) or other storage device accessible by the apparatus 700. The apparatus 700 may load the program 730 from the computer-readable medium into RAM 722 for execution. In some exemplary embodiments, the computer-readable storage medium may include any type of non-transitory storage medium, such as ROM, EPROM, flash memory, hard disk, CD, DVD, etc. As used herein, the term "non-transitory" is a constraint on the medium itself (i.e., being tangible, not a signal), as opposed to a constraint on the permanence of data storage (e.g., RAM vs. ROM).

[0138] 8 shows an example of a computer readable medium 800, which may be in the form of a CD, DVD, or other optical storage disc. The computer readable medium 800 has the program 730 stored thereon.

[0139] In general, various embodiments of the present disclosure may be implemented in hardware or special purpose circuits, software, logic, or any combination thereof. Some aspects may be implemented in hardware, while other aspects may be implemented in firmware or software that may be executed by a controller, microprocessor, or other computing device. While various aspects of the embodiments of the present disclosure are illustrated and described using block diagrams, flowcharts, or some other graphical representations, it should be understood that the blocks, apparatus, systems, techniques, or methods described herein may be implemented in, by way of non-limiting example, hardware, software, firmware, special purpose circuits or logic, general purpose hardware or controller, or other computing device, or some combination thereof.

[0140] Some example embodiments of the present disclosure also provide at least one computer program product physically stored on a computer-readable medium, such as a non-transitory computer-readable medium. The computer program product includes computer-executable instructions, such as those included in program modules, that execute on a target physical or virtual processor device to perform any of the methods described above. Generally, program modules include routines, programs, libraries, objects, classes, components, data structures, etc. that perform particular tasks or implement particular abstract data types. The functionality of the program modules may be combined or split among program modules as desired in various embodiments. The machine-executable instructions of the program modules may be executed in local or distributed devices. In a distributed device, program modules may be located in both local and remote storage media.

[0141] Program code for implementing the methods of the present disclosure can be written in any combination of one or more programming languages. The program code can be provided to a processor or controller of a general-purpose computer, a special-purpose computer, or other programmable data processing apparatus such that, when executed by the processor or controller, the functions / acts specified in the flowcharts and / or block diagrams are performed. The program code can be executed entirely on the machine, partially on the machine as a stand-alone software package, partially on the machine and partially on a remote machine, or entirely on a remote machine or server.

[0142] In the context of the present disclosure, computer program code or associated data may be transmitted by any suitable carrier to enable a device, apparatus, or processor to perform the various processes and operations as described above. Examples of carriers include signals, computer-readable media, etc.

[0143] The computer-readable medium may be a computer-readable signal medium or a computer-readable storage medium. The computer-readable medium includes, but is not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or a suitable combination thereof. More specific examples of the computer-readable storage medium include an electrical connection having one or more wires, a portable computer diskette, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disc read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or a suitable combination thereof.

[0144] Furthermore, although operations are depicted in a particular order, this should not be understood as requiring such operations to be performed in the particular order or sequentially shown, or that all of the operations depicted be performed, to achieve desirable results. In certain situations, multitasking and parallel processing may be advantageous. Similarly, while details of several specific implementations are included in the above discussion, these should not be construed as limitations on the scope of the disclosure, but rather as descriptions of features that may be unique to particular embodiments. Unless expressly stated, certain features that are described in the context of separate embodiments can also be implemented in combination in a single embodiment. Conversely, unless expressly stated, various features that are described in the context of a single embodiment may also be implemented in multiple embodiments separately or in any suitable subcombination.

[0145] Although the present disclosure has been described in language specific to structural features and / or methodological acts, it is to be understood that the present disclosure, as defined in the appended claims, is not necessarily limited to the particular features or acts described above. Rather, the specific features and acts described above are disclosed as example forms of implementing the claims.

Claims

1. 1. An apparatus comprising: at least one processor; When executed by at least one processor, the apparatus receiving at least one higher layer parameter that configures a first demodulation reference signal (DMRS) configuration type and a second DMRS configuration type; receiving at least one of: a first indication of at least one transmission parameter associated with at least one uplink transmission; or a second indication indicating a first DMRS configuration type or a second DMRS configuration type to be applied to at least one uplink transmission; receiving at least one of: determining at least one of a first or second DMRS configuration type based on at least one of the first or second indication; performing at least one uplink transmission by using at least one of the determined first or second DMRS configuration types; and at least one memory storing instructions for executing the An apparatus comprising:

2. The device, receiving a configuration of an association between at least one of a first or second DMRS configuration type and at least one transmission parameter; The apparatus of claim 1 further configured to perform the following:

3. At least one transmission parameter is Transmission Configuration Indicator (TCI) state identification (ID); Indicate TCI status, reference signal, Scheduling offset, Timing advance, Controlled Resource Set (CORESET) Pool Index Value or CORESET Group Index Value, DMRS mapping type, or Physical Cell Identifier 3. The apparatus of claim 1, further comprising at least one of:

4. 4. The apparatus of claim 3, wherein at least one of the first or second DMRS configuration types is determined based on a type configured in or associated with the indicated TCI state, and the first or second DMRS configuration type is applied to the TCI state ID configured as the indicated TCI state.

5. 4. The apparatus of claim 3, wherein in response to receiving the TCI state ID, the first DMRS configuration type is determined based on an association between the TCI state ID and the first DMRS configuration type.

6. 4. The apparatus of claim 3, wherein in response to receiving a first indication of a scheduling offset, a first DMRS configuration type is determined if the scheduling offset is less than a threshold offset.

7. 4. The apparatus of claim 3, wherein in response to receiving a first indication of a timing advance, the first DMRS configuration type is determined if the timing advance value is greater than or equal to a first threshold time value and less than a second threshold time value.

8. 10. The apparatus of claim 1, wherein in response to receiving the first and second indications, a first DMRS configuration type is determined based on the second indication.

9. the first indication is received via one of Radio Resource Control (RRC) signaling, a Medium Access Control (MAC) control element (CE), or a Downlink Control Information (DCI); and / or The apparatus of claim 1 , wherein the second indication is received via a DCI or a MAC CE.

10. The apparatus of claim 1 , wherein the at least one uplink transmission comprises two simultaneous uplink transmissions based on at least one of a first and a second DMRS configuration type.

11. The device, performing a further uplink transmission based on a default DMRS configuration type without using at least one of the first or second indication; The apparatus according to claim 1 , further configured to perform the following:

12. at least one processor; When executed by at least one processor, the apparatus transmitting at least one higher layer parameter that configures a first demodulation reference signal (DMRS) configuration type and a second DMRS configuration type; determining at least one of a first or a second DMRS configuration type for at least one uplink transmission; transmitting at least one of the following: a first indication of at least one transmission parameter associated with at least one uplink transmission; or a second indication indicating a first DMRS configuration type or a second DMRS configuration type to be applied to at least one uplink transmission; transmitting at least one of: receiving at least one uplink transmission by using the determined at least one of the first or second DMRS configuration type; at least one memory storing instructions for causing the An apparatus comprising:

13. The device, Transmitting a configuration of an association between at least one of the first or second DMRS configuration types and at least one transmission parameter. The apparatus of claim 10 further configured to:

14. At least one transmission parameter is Transmission Configuration Indicator (TCI) state identification (ID); Indicate TCI status, reference signal, Scheduling offset, Timing advance, Controlled Resource Set (CORESET) Pool Index Value or CORESET Group Index Value, DMRS mapping type, or Physical Cell Identifier 14. The apparatus of claim 12 or 13, comprising at least one of:

15. 1. A method comprising: receiving at least one higher layer parameter that configures a first demodulation reference signal (DMRS) configuration type and a second DMRS configuration type; receiving at least one of: a first indication of at least one transmission parameter associated with at least one uplink transmission; or a second indication indicating a first DMRS configuration type or a second DMRS configuration type to be applied to at least one uplink transmission; receiving at least one of: determining at least one of a first or second DMRS configuration type based on at least one of the first or second indication; performing at least one uplink transmission by using at least one of the determined first or second DMRS configuration types; and A method comprising:

16. receiving a configuration of associations between the first and / or second DMRS configuration types and at least one transmission parameter; 16. The method of claim 15, further comprising:

17. At least one transmission parameter is Transmission Configuration Indicator (TCI) state identification (ID); Indicate TCI status, reference signal, Scheduling offset, Timing advance, Controlled Resource Set (CORESET) Pool Index Value or CORESET Group Index Value, DMRS mapping type, or Physical Cell Identifier 17. The method of claim 15 or 16, comprising at least one of:

18. It is a method transmitting at least one higher layer parameter that configures a first demodulation reference signal (DMRS) configuration type and a second DMRS configuration type; determining at least one of a first or a second DMRS configuration type for at least one uplink transmission; transmitting at least one of the following: a first indication of at least one transmission parameter associated with at least one uplink transmission; or a second indication indicating a first DMRS configuration type or a second DMRS configuration type to be applied to at least one uplink transmission; transmitting at least one of: receiving at least one uplink transmission by using the determined at least one of the first or second DMRS configuration type; A method comprising:

19. The device, Transmitting a configuration of associations between the first and / or second DMRS configuration type and at least one transmission parameter. The method of claim 18 further comprising:

20. At least one transmission parameter is Transmission Configuration Indicator (TCI) state identification (ID); Indicate TCI status, reference signal, Scheduling offset, Timing advance, Controlled Resource Set (CORESET) Pool Index Value or CORESET Group Index Value, DMRS mapping type, or Physical Cell Identifier 20. The method of claim 18 or 19, comprising at least one of:

21. A computer readable medium having stored thereon instructions for causing an apparatus to at least perform the method of any of claims 15 to 17 or any of claims 18 to 20.

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