Downlink control information indicating a transmission control indicator state

Abstract

Apparatuses, methods, and systems are disclosed for downlink control information indicating transmission control indicator state. One method (500) includes transmitting (502), to a UE, a DCI format indicating, to the UE, a PDSCH, wherein: the PDSCH includes two TCI states corresponding to a plurality of DMRS antenna ports; a first TCI state of the two TCI states is associated with a first set of DMRS antenna ports of the plurality of DMRS antenna ports; a second TCI state of the two TCI states is associated with a second set of DMRS antenna ports of the plurality of DMRS antenna ports; and a first number of DMRS antenna ports in the first set of DMRS antenna ports is equal to a second number of DMRS antenna ports in the second set of DMRS antenna ports.

Description

Technical Field

[0001] The subject matter disclosed herein generally relates to wireless communication, and more specifically to downlink control information indicating the status of transmission control indicators. Background Technology

[0002] The following abbreviations are defined herein, and at least some of them are referenced in the following description: Third Generation Partnership Project (“3GPP”), 5G... QoS Indicator (“5QI”), Acknowledgment Mode (“AM”), Aperiodicity (“AP”), Backhaul (“BH”), Broadcast / Multicast (“BM”), Buffer Occupancy (“BO”), Base Station (“BS”), Buffer Status Report (“BSR”), Bandwidth (“BW”), Bandwidth Portion (“BWP”), Carrier Aggregation (“CA”), Code Block Group (“CBG”), CBG Flush Information (“CBGFI”), CBG Transmission Information (“CBGTI”), Component Carrier (“CC”), Code Division Multiplexing (“CDM”), Control Element (“CE”), Coordinated Multipoint (“CoMP”), Demand Category (“CoR”), Control Resource Set (“CORESET”), Cyclic Prefix (“CP”), Cyclic Prefix OFDM (“CP-OFDM”), Cyclic Redundancy Check (“CRC”), CSI-RS Resource Indicator (“CRI”), Cell RNTI (“C-RNTI”), Channel State Information (“CSI”), CSI IM (“CSI-IM”), CSI RS (“CSI-RS”), Channel Quality Indicator (“CQI”), Central Unit (“CU”), Codeword (“CW”), Downlink Allocation Index (“DAI”), Downlink Control Information (“DCI”), Downlink Feedback Information (“DFI”), Downlink (“DL”), Discrete Fourier Transform Extended OFDM (“DFT-s-OFDM”), Demodulation Reference Signal (“DMRS” or “DM-RS”), Data Radio Bearer (“DRB”), Dedicated Short Range Communication (“DSRC”), Distributed Unit (“DU”), Enhanced Mobile Broadband (“eMBB”), Evolved Node B (“eNB”), Enhanced Subscriber Identity Module (“eSIM”), Enhanced (“E”) Frequency Division Duplex (“FDD”), Frequency Division Multiplexing (“FDM”), Frequency Division Multiple Access (“FDMA”), Frequency Range (“FR”), 450MHz–6000MHz (“FR1”), 24250MHz–52600MHz (“FR2”), Hybrid Automatic Repeat Request (“HARQ”), High Definition Multimedia Interface (“HDMI”), High-Speed ​​Train (“HST”), Integrated Access Backhaul (“IAB”), Identity or Identifier or Marker (“ID”), Information Element (“IE”), Interference Measurement (“IM”), International Mobile Subscriber Identity (“IMSI”), Internet of Things (“IoT”), Internet Protocol (“IP”), Joint Transport (“JT”), Level 1 (“L1”), L1 RSRP (“L1-RSRP”), L1 SINR (“L1-SINR”), Logical Channel (“LCH”), Logical Channel Group (“LCG”), Logical Channel ID (“LCID”)Logical Channel Priority (“LCP”), Layer Indicator (“LI”), Least Significant Bit (“LSB”), Long Term Evolution (“LTE”), Level of Automation (“LoA”), Media Access Control (“MAC”), Modulation and Coding Scheme (“MCS”), Multiple DCI (“M-DCI”), Master Information Block (“MIB”), Multiple Input Multiple Output (“MIMO”), Maximum Allowable Illumination (“MPE”), Most Significant Bit (“MSB”), Mobile Terminal (“MT”), Machine Type Communication (“MTC”), Multiple PDSCH (“Multi-PDSCH”), Multiple TRP (“M-TRP”), Multiple Users (“MU”), Multiple Users MIMO (“MU-MIMO”), Minimum Mean Square Error (“MMSE”), Negative Acknowledgment (“NACK”) or (“NAK”), Incoherent Joint Transmission (“NCJT”), Next Generation (“NG”), Next Generation Node B (“gNB”), New Radio (“NR”), Non-Zero Power (“NZP”), NZP CSI-RS (“NZP-CSI-RS”), Orthogonal Frequency Division Multiplexing (“OFDM”), Peak-to-Average Power Ratio (“PAPR”), Physical Broadcast Channel (“PBCH”), Physical Downlink Control Channel (“PDCCH”), Physical Downlink Shared Channel (“PDSCH”), PDSCH Configuration (“PDSCH-Config”), Policy Control Function (“PCF”), Packet Data Convergence Protocol (“PDCP”), Packet Data Network (“PDN”), Protocol Data Unit (“PDU”), Public Land Mobile Network (“PLMN”), Precoding Matrix Indicator (“PMI”), ProSe Per-Packet Priority (“PPPP”), ProSe Per-Packet Reliability (“PPPR”), Physical Resource Block (“PRB”), Switched Packet (“PS”), Physical Sidelink Control Channel (“PSCCH”), Physical Sidelink Shared Channel (“PSS”) CH”), Phase Tracking RS (“PTRS” or “PT-RS”), Physical Uplink Control Channel (“PUCCH”), Physical Uplink Shared Channel (“PUSCH”), Quasi-Co-configuration (“QCL”), Quality of Service (“QoS”), Random Access Channel (“RACH”), Radio Access Network (“RAN”), Radio Access Technology (“RAT”), Resource Element (“RE”), Radio Frequency (“RF”), Rank Indicator (“RI”), Radio Link Control (“RLC”), Radio Link Failure (“RLF”), Radio Network Temporary Identifier (“RNTI”), Resource Pool (“RP”), Radio Resource Control (“RRC”), Remote Radio Head (“RRH”), Reference Signal (“RS”), Reference Signal Received Power (“RSRP”), Reference Signal Received Quality (“RSRQ”), Redundancy Version (“RV”), Receive (“RX”)Single-Carrier Frequency Domain Spread Spectrum (“SC-FDSS”), Secondary Cell (“SCell”), Spatial Channel Model (“SCM”), Subcarrier Spacing (“SCS”), Single DCI (“S-DCI”), Spatial Division Multiplexing (“SDM”), Serving Data Unit (“SDU”), Single-Frequency Network (“SFN”), Subscriber Identity Module (“SIM”), Signal-to-Interference-to-Noise Ratio (“SINR”), Sidelink (“SL”), Sequence Number (“SN”), Semi-Persistent (“SP”), Scheduling Request (“SR”), SRS Resource Indicator (“SRI”), Sounding Reference Signal (“SRS”), Synchronization Signal (“SS”), SS / PBCH Block (“SSB”), Transport Block (“TB”), Transmission Configuration Indicator (“TCI”), Time Division Duplex (“TDD”), Time Division Multiplexing (“TDM”), Temporary Mobile Subscriber Identity (“TMSI”), Transmit Power Control (“TPC”), Transmit Precoding Motion The array indicator (“TPMI”), transmit / receive point (“TRP”), technical standard (“TS”), transmit (“TX”), user entity / equipment (mobile terminal) (“UE”), universal integrated circuit card (“UICC”), uplink (“UL”), unacknowledged mode (“UM”), universal mobile telecommunications system (“UMTS”), LTE radio interface (“Uu interface”), user plane (“UP”), ultra-reliable low-latency communication (“URLLC”), universal subscriber identity module (“USIM”), universal terrestrial radio access network (“UTRAN”), vehicle-to-everything (“V2X”), voice over IP (“VoIP”), access to public terrestrial mobile network (“VPLMN”), virtual resource block (“VRB”), vehicle RNTI (“V-RNTI”), global interoperability of microwave access (“WiMAX”), zero-forcing (“ZF”), zero power (“ZP”), and ZP CSI-RS (“ZP-CSI-RS”). As used in this article, "HARQ-ACK" can represent both a positive response ("ACK") and a negative response ("NAK"). ACK indicates that the TB was received correctly, while NAK indicates that the TB was received incorrectly.

[0003] In some wireless communication networks, DCI can be used to configure various projects. Summary of the Invention

[0004] A method for indicating downlink control information states of transmission control indicator (TCI) symbols is disclosed. Apparatus and systems also perform the function of the method. In one embodiment, the method includes transmitting downlink control information in a format indicating a physical downlink shared channel to a user equipment, wherein: the physical downlink shared channel includes two TCI symbols corresponding to a plurality of demodulation reference signal antenna ports; a first TCI symbol state of the two TCI symbols is associated with a first set of demodulation reference signal antenna ports of the plurality of demodulation reference signal antenna ports; a second TCI symbol state of the two TCI symbols is associated with a second set of demodulation reference signal antenna ports of the plurality of demodulation reference signal antenna ports; and a first number of demodulation reference signal antenna ports in the first set of demodulation reference signal antenna ports is equal to a second number of demodulation reference signal antenna ports in the second set of demodulation reference signal antenna ports.

[0005] In one embodiment, an apparatus for indicating downlink control information of transmission control indicator states includes a transmitter that transmits downlink control information in a format indicating a physical downlink shared channel to a user equipment, wherein: the physical downlink shared channel includes two transmission control indicator states corresponding to a plurality of demodulation reference signal antenna ports; a first transmission control indicator state of the two transmission control indicator states is associated with a first set of demodulation reference signal antenna ports of the plurality of demodulation reference signal antenna ports; a second transmission control indicator state of the two transmission control indicator states is associated with a second set of demodulation reference signal antenna ports of the plurality of demodulation reference signal antenna ports; and a first number of demodulation reference signal antenna ports in the first set of demodulation reference signal antenna ports is equal to a second number of demodulation reference signal antenna ports in the second set of demodulation reference signal antenna ports.

[0006] A method for indicating downlink control information of transmission control indicator states includes, at a user equipment, receiving downlink control information format indicating a physical downlink shared channel, wherein: the physical downlink shared channel includes two transmission control indicator states corresponding to a plurality of demodulation reference signal antenna ports; a first transmission control indicator state of the two transmission control indicator states is associated with a first set of demodulation reference signal antenna ports of the plurality of demodulation reference signal antenna ports; a second transmission control indicator state of the two transmission control indicator states is associated with a second set of demodulation reference signal antenna ports of the plurality of demodulation reference signal antenna ports; and a first number of demodulation reference signal antenna ports in the first set of demodulation reference signal antenna ports is equal to a second number of demodulation reference signal antenna ports in the second set of demodulation reference signal antenna ports.

[0007] In one embodiment, a user equipment (UE) is provided with means for indicating downlink control information of transmission control indicator states. The means further includes a receiver that receives downlink control information in a format indicating a downlink shared channel, wherein: the physical downlink shared channel includes two transmission control indicator states corresponding to a plurality of demodulation reference signal antenna ports; a first transmission control indicator state of the two transmission control indicator states is associated with a first set of demodulation reference signal antenna ports of the plurality of demodulation reference signal antenna ports; a second transmission control indicator state of the two transmission control indicator states is associated with a second set of demodulation reference signal antenna ports of the plurality of demodulation reference signal antenna ports; and a first number of demodulation reference signal antenna ports in the first set of demodulation reference signal antenna ports is equal to a second number of demodulation reference signal antenna ports in the second set of demodulation reference signal antenna ports. Attached Figure Description

[0008] A more detailed description of the embodiments briefly described above will be presented by referring to the specific embodiments illustrated in the accompanying drawings. It should be understood that these drawings depict only some embodiments and should therefore not be considered as limiting the scope; the embodiments will be described and explained with additional specificity and detail using the drawings, wherein:

[0009] Figure 1 This is a schematic block diagram illustrating an embodiment of a wireless communication system for indicating downlink control information for transmitting control indicator status;

[0010] Figure 2 This is a schematic block diagram illustrating one embodiment of a device for indicating downlink control information that can be used to indicate the status of a transmission control indicator;

[0011] Figure 3 This is a schematic block diagram illustrating one embodiment of a device for indicating downlink control information that can be used to indicate the status of a transmission control indicator;

[0012] Figure 4 This is a schematic block diagram illustrating one embodiment of a system in which there is joint transmission from two TRPs to the UE;

[0013] Figure 5 This is a schematic flowchart illustrating an embodiment of a method 500 for indicating the state of a transmission control indicator for downlink control information; and

[0014] Figure 6 This is a schematic flowchart illustrating another embodiment of a method 600 for indicating the status of a transmission control indicator for downlink control information. Detailed Implementation

[0015] As those skilled in the art will recognize, aspects of the embodiments can be embodied as a system, apparatus, method, or program product. Therefore, embodiments can take the form of a completely hardware embodiment, a completely software embodiment (including firmware, resident software, microcode, etc.), or an embodiment combining software and hardware aspects, which may generally be referred to herein as "circuit," "module," or "system." Furthermore, embodiments can take the form of a program product embodied in one or more computer-readable storage devices storing machine-readable code, computer-readable code, and / or program code, hereinafter referred to as "code." The storage device can be tangible, non-transitory, and / or non-transferable. The storage device may not embody signals. In one embodiment, the storage device only employs signals for accessing the code.

[0016] Certain functional units described in this specification may be labeled as modules to more specifically emphasize their implementation independence. For example, a module may be implemented as hardware circuitry comprising custom-designed very large-scale integration (“VLSI”) circuitry or gate arrays, off-the-shelf semiconductors such as logic chips, transistors, or other discrete components. Modules may also be implemented in programmable hardware devices such as field-programmable gate arrays, programmable array logic, programmable logic devices, etc.

[0017] Modules can also be implemented as code and / or software for execution by various types of processors. The identified code module may, for example, comprise one or more physical or logical blocks of executable code, which may, for example, be organized as objects, procedures, or functions. However, the executable files of the identified modules do not need to be physically located together, but may include disparate instructions stored in different locations that, when logically linked together, comprise the module and implement its stated purpose.

[0018] In practice, a code module can be a single instruction or many instructions, and can even be distributed across several different code segments, different programs, and across several memory devices. Similarly, in this document, operational data can be identified and visualized within a module, and can be represented in any suitable form and organized within any suitable type of data structure. Operational data can be collected as a single dataset or can be distributed across different locations included on different computer-readable storage devices. Where the module or part of a module is implemented in software, the software portion is stored on one or more computer-readable storage devices.

[0019] Any combination of one or more computer-readable media may be used. A computer-readable medium may be a computer-readable storage medium. A computer-readable storage medium may be a storage device for storing code. A storage device may be, for example, but not limited to, electronic, magnetic, optical, electromagnetic, infrared, holographic, micromechanical, or semiconductor systems, apparatuses, or devices, or any suitable combination thereof.

[0020] More specific examples of storage devices (a non-exhaustive list) will include the following: electrical connections having one or more wires, portable computer disks, hard disks, random access memory (“RAM”), read-only memory (“ROM”), erasable programmable read-only memory (“EPROM” or flash memory), portable compact optical disc read-only memory (“CD-ROM”), optical storage devices, magnetic storage devices, or any suitable combination of the foregoing. In the context of this document, a computer-readable storage medium can be any tangible medium capable of containing or storing programs for use by or in connection with an instruction execution system, apparatus, or device.

[0021] The code used to perform the operations of the embodiments can be any number of lines and can be written in any combination of one or more programming languages, including object-oriented programming languages ​​such as Python, Ruby, Java, Smalltalk, C++, and traditional procedural programming languages ​​such as the "C" programming language, and / or machine languages ​​such as assembly language. The code can be executed entirely on the user's computer, partially on the user's computer, as a standalone software package, partially on the user's computer and partially on a remote computer, or entirely on a remote computer or server. In the latter scenario, the remote computer can be connected to the user's computer via any type of network, including a local area network ("LAN") or a wide area network ("WAN"), or can be connected to an external computer (e.g., via the Internet through an Internet service provider).

[0022] References to "an embodiment," "embodiment," or similar language in this specification mean that a particular feature, structure, or characteristic described in connection with an embodiment is included in at least one embodiment. Therefore, unless expressly stated otherwise, the phrases "in an embodiment," "in an embodiment," and similar language appearing throughout this specification may, but not necessarily all, refer to the same embodiment, but rather mean "one or more, but not all, embodiments." Unless expressly stated otherwise, the terms "comprising," "including," "having," and variations thereof mean "including, but not limited to,". Unless expressly stated otherwise, the list of items does not indicate that any or all items are mutually exclusive. Unless expressly stated otherwise, the terms "a / an" and "the" also mean "one or more".

[0023] Furthermore, the features, structures, or characteristics of the described embodiments can be combined in any suitable manner. Numerous specific details, such as examples of programming, software modules, user selection, network transactions, database queries, database structures, hardware modules, hardware circuits, hardware chips, etc., are provided in the following description to provide a thorough understanding of the embodiments. However, those skilled in the art will recognize that the embodiments can be practiced without one or more specific details, or with other methods, components, materials, etc. In other instances, well-known structures, materials, or operations have not been shown or described in detail to avoid obscuring aspects of the embodiments.

[0024] The aspects of the embodiments are described below with reference to schematic flowcharts and / or schematic block diagrams of methods, apparatus, systems, and program products according to the embodiments. It will be understood that each block of the schematic flowcharts and / or schematic block diagrams, and combinations of blocks in the schematic flowcharts and / or schematic block diagrams, can be implemented by code. The code can be provided to a processor of a general-purpose computer, special-purpose computer, or other programmable data processing apparatus to generate machinery, such that instructions executable via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions / operations specified in one or more blocks of the schematic flowcharts and / or schematic block diagrams.

[0025] The code can also be stored in a storage device that can instruct a computer, other programmable data processing device or other device to operate in a particular manner, such that the instructions stored in the storage device produce an article of art that implements the function / action specified in one or more boxes of a schematic flowchart and / or schematic block diagram.

[0026] The code may also be loaded onto a computer, other programmable data processing apparatus or other device, causing a series of operational steps to be performed on the computer, other programmable apparatus or other device to produce a computer-implemented process, such that the code executing on the computer or other programmable apparatus provides a process for implementing the functions / actions specified in one or more boxes of the flowchart and / or block diagram.

[0027] The schematic flowcharts and / or schematic block diagrams in the accompanying drawings illustrate the architecture, functionality, and operation of possible implementations of apparatus, systems, methods, and program products according to various embodiments. In this regard, each block in the schematic flowcharts and / or schematic block diagrams may represent a module, segment, or portion of code, which includes one or more executable instructions for implementing a specified logical function.

[0028] It should also be noted that in some alternative embodiments, the functions annotated in the boxes may occur in a different order than those annotated in the figures. For example, depending on the functions involved, two boxes shown successively may actually be performed substantially simultaneously, or these boxes may sometimes be performed in reverse order. Other steps and methods are conceivable that are functionally, logically, or effectively equivalent to one or more boxes or portions thereof in the illustrated figures.

[0029] While various arrow and line types may be used in flowcharts and / or block diagrams, it should be understood that they do not limit the scope of the respective embodiments. In fact, some arrows or other connectors may be used only to indicate the logical flow of the depicted embodiment. For example, an arrow may indicate a wait or monitoring period of unspecified duration between enumeration steps in a depicted embodiment. It will also be noted that each block in a block diagram and / or flowchart, and combinations of blocks in block diagrams and / or flowcharts, can be implemented by a system based on dedicated hardware, or a combination of dedicated hardware and code, that performs a specific function or action.

[0030] The description of the elements in each figure can be referenced to the elements in the preceding figures. Similar reference numerals refer to similar elements in all figures, including alternative embodiments of similar elements.

[0031] Figure 1 An embodiment of a wireless communication system 100 for indicating downlink control information of a transmission control indicator state is depicted. In one embodiment, the wireless communication system 100 includes a remote unit 102 and a network unit 104. Even Figure 1 A specific number of remote units 102 and network units 104 are depicted in the document, and those skilled in the art will recognize that any number of remote units 102 and network units 104 can be included in the wireless communication system 100.

[0032] In one embodiment, remote unit 102 may include computing devices such as desktop computers, laptop computers, personal digital assistants (“PDAs”), tablet computers, smartphones, smart TVs (e.g., internet-connected TVs), set-top boxes, game consoles, security systems (including security cameras), in-vehicle computers, network devices (e.g., routers, switches, modems), IoT devices, etc. In some embodiments, remote unit 102 includes wearable devices such as smartwatches, fitness bands, optical head-mounted displays, etc. Furthermore, remote unit 102 may be referred to as a subscriber unit, mobile device, mobile station, user, terminal, mobile terminal, fixed terminal, subscriber station, UE, user terminal, device, or other terms used in the art. Remote unit 102 may communicate directly with one or more network units 104 via UL communication signals and / or remote unit 102 may communicate directly with other remote units 102 via sidelink communication.

[0033] Network unit 104 may be distributed across a geographical area. In some embodiments, network unit 104 may also be referred to as an access point, access terminal, base station, node-B, eNB, gNB, home node-B, RAN, relay node, device, network device, IAB node, donor IAB node, or any other term used in the art. Network unit 104 is typically part of a radio access network that includes one or more controllers communicatively coupled to one or more corresponding network units 104. The radio access network is typically communicatively coupled to one or more core networks, which may be coupled to other networks such as the Internet and the public switched telephone network. These and other elements of the radio access and core networks are not illustrated but are generally well known to those skilled in the art.

[0034] In one implementation, the wireless communication system 100 conforms to the 5G or NG (Next Generation) standard of the 3GPP protocol, wherein the network unit 104 uses NG RAN technology for transmission. However, more generally, the wireless communication system 100 may implement other open or proprietary communication protocols, such as WiMAX and other protocols. This disclosure is not intended to limit implementation to any particular wireless communication system architecture or protocol.

[0035] Network unit 104 can serve multiple remote units 102 within a service area, such as a cell or cell sector, via a wireless communication link. Network unit 104 transmits DL communication signals to serve the remote units 102 in the time domain, frequency domain, and / or spatial domain.

[0036] In some embodiments, network unit 104 may transmit downlink control information in a format indicating a physical downlink shared channel to a user equipment (e.g., remote unit 102), wherein: the physical downlink shared channel includes two transmission control indicator states corresponding to a plurality of demodulation reference signal antenna ports; a first transmission control indicator state of the two transmission control indicator states is associated with a first set of demodulation reference signal antenna ports of the plurality of demodulation reference signal antenna ports; a second transmission control indicator state of the two transmission control indicator states is associated with a second set of demodulation reference signal antenna ports of the plurality of demodulation reference signal antenna ports; and a first number of demodulation reference signal antenna ports in the first set of demodulation reference signal antenna ports is equal to a second number of demodulation reference signal antenna ports in the second set of demodulation reference signal antenna ports. Therefore, network unit 104 can be used to indicate downlink control information of transmission control indicator states.

[0037] In various embodiments, remote unit 102 (e.g., UE) can receive downlink control information format indicating a physical downlink shared channel, wherein: the physical downlink shared channel includes two transmission control indicator states corresponding to a plurality of demodulation reference signal antenna ports; a first transmission control indicator state of the two transmission control indicator states is associated with a first set of demodulation reference signal antenna ports of the plurality of demodulation reference signal antenna ports; a second transmission control indicator state of the two transmission control indicator states is associated with a second set of demodulation reference signal antenna ports of the plurality of demodulation reference signal antenna ports; and a first number of demodulation reference signal antenna ports in the first set of demodulation reference signal antenna ports is equal to a second number of demodulation reference signal antenna ports in the second set of demodulation reference signal antenna ports. Therefore, remote unit 102 can be used to indicate downlink control information of transmission control indicator states.

[0038] Figure 2 An embodiment of a device 200 that can be used to indicate the status of a transmission control indicator is depicted. The device 200 includes one embodiment of a remote unit 102. Furthermore, the remote unit 102 may include a processor 202, a memory 204, an input device 206, a display 208, a transmitter 210, and a receiver 212. In some embodiments, the input device 206 and the display 208 are combined into a single device, such as a touchscreen. In some embodiments, the remote unit 102 may not include any input device 206 and / or the display 208. In various embodiments, the remote unit 102 may include one or more of the processor 202, memory 204, transmitter 210, and receiver 212, and may not include the input device 206 and / or the display 208.

[0039] In one embodiment, processor 202 may include any known controller capable of executing computer-readable instructions and / or performing logical operations. For example, processor 202 may be a microcontroller, microprocessor, central processing unit (“CPU”), graphics processing unit (“GPU”), auxiliary processing unit, field-programmable gate array (“FPGA”), or similar programmable controller. In some embodiments, processor 202 executes instructions stored in memory 204 to perform the methods and routines described herein. Processor 202 is communicatively coupled to memory 204, input device 206, display 208, transmitter 210, and receiver 212.

[0040] In one embodiment, memory 204 is a computer-readable storage medium. In some embodiments, memory 204 includes volatile computer storage media. For example, memory 204 may include RAM, including dynamic RAM (“DRAM”), synchronous dynamic RAM (“SDRAM”), and / or static RAM (“SRAM”). In some embodiments, memory 204 includes non-volatile computer storage media. For example, memory 204 may include a hard disk drive, flash memory, or any other suitable non-volatile computer storage device. In some embodiments, memory 204 includes both volatile and non-volatile computer storage media. In some embodiments, memory 204 also stores program code and related data, such as an operating system or other controller algorithms operating on remote unit 102.

[0041] In one embodiment, input device 206 may include any known computer input device, including a touchpad, button, keyboard, stylus, microphone, etc. In some embodiments, input device 206 may be integrated with display 208, for example, as a touchscreen or similar touch-sensitive display. In some embodiments, input device 206 includes a touchscreen, allowing text to be entered using a virtual keyboard displayed on the touchscreen and / or by handwriting on the touchscreen. In some embodiments, input device 206 includes two or more different devices such as a keyboard and a touchpad.

[0042] In one embodiment, display 208 may include any known electronically controllable display or display device. Display 208 may be designed to output visual signals, auditory signals, and / or tactile signals. In some embodiments, display 208 includes an electronic display capable of outputting visual data to a user. For example, display 208 may include, but is not limited to, LCD displays, LED displays, OLED displays, projectors, or similar display devices capable of outputting images, text, etc., to a user. As another non-limiting example, display 208 may include wearable displays such as smartwatches, smart glasses, head-up displays, etc. Furthermore, display 208 may be a component of a smartphone, personal digital assistant, television, desktop computer, laptop computer, personal computer, vehicle dashboard, etc.

[0043] In some embodiments, display 208 includes one or more speakers for generating sound. For example, display 208 may generate an audible alarm or notification (e.g., a buzzer or ring). In some embodiments, display 208 includes one or more haptic devices for generating vibration, motion, or other haptic feedback. In some embodiments, all or part of display 208 may be integrated with input device 206. For example, input device 206 and display 208 may form a touchscreen or similar touch-sensitive display. In other embodiments, display 208 may be located near input device 206.

[0044] In some embodiments, transmitter 210 may be used to transmit the information described herein and / or receiver 212 may be used to receive the information described herein and / or processor 202 may be used to process the information described herein.

[0045] In some embodiments, receiver 212 may receive a downlink control information format indicating a physical downlink shared channel, wherein: the physical downlink shared channel includes two transmission control indicator states corresponding to a plurality of demodulation reference signal antenna ports; a first transmission control indicator state of the two transmission control indicator states is associated with a first set of demodulation reference signal antenna ports of the plurality of demodulation reference signal antenna ports; a second transmission control indicator state of the two transmission control indicator states is associated with a second set of demodulation reference signal antenna ports of the plurality of demodulation reference signal antenna ports; and a first number of demodulation reference signal antenna ports in the first set of demodulation reference signal antenna ports is equal to a second number of demodulation reference signal antenna ports in the second set of demodulation reference signal antenna ports.

[0046] Although only one transmitter 210 and one receiver 212 are illustrated, the remote unit 102 can have any suitable number of transmitters 210 and receivers 212. The transmitters 210 and receivers 212 can be of any suitable type. In one embodiment, the transmitters 210 and receivers 212 can be part of a transceiver.

[0047] Figure 3An embodiment of a device 300 that can be used to indicate the status of a transmission control indicator is depicted. The device 300 includes one embodiment of a network unit 104. Furthermore, the network unit 104 may include a processor 302, a memory 304, an input device 306, a display 308, a transmitter 310, and a receiver 312. As will be appreciated, the processor 302, memory 304, input device 306, display 308, transmitter 310, and receiver 312 may be substantially similar to the processor 202, memory 204, input device 206, display 208, transmitter 210, and receiver 212 of the remote unit 102, respectively.

[0048] In various embodiments, transmitter 310 may transmit downlink control information in a format indicating a physical downlink shared channel to a user equipment, wherein: the physical downlink shared channel includes two transmission control indicator states corresponding to a plurality of demodulation reference signal antenna ports; a first transmission control indicator state of the two transmission control indicator states is associated with a first set of demodulation reference signal antenna ports of the plurality of demodulation reference signal antenna ports; a second transmission control indicator state of the two transmission control indicator states is associated with a second set of demodulation reference signal antenna ports of the plurality of demodulation reference signal antenna ports; and a first number of demodulation reference signal antenna ports in the first set of demodulation reference signal antenna ports is equal to a second number of demodulation reference signal antenna ports in the second set of demodulation reference signal antenna ports.

[0049] Although only one transmitter 310 and one receiver 312 are illustrated, network unit 104 can have any suitable number of transmitters 310 and receivers 312. Transmitters 310 and receivers 312 can be of any suitable type. In one embodiment, transmitters 310 and receivers 312 can be part of a transceiver.

[0050] In some embodiments, the PDSCH transmission scheme can be used to enhance reliability by employing two sets of DM-RSs associated with different TCI states and transmitted in separate CDM groups, while jointly transmitting data. Such embodiments can facilitate better channel estimation for multi-TRP scenarios if the channels from the two TRPs exhibit different (e.g., significantly different) Doppler shifts. Furthermore, in such embodiments, the overhead of the DM-RS may be high due to the use of two different CDM groups. In some embodiments, the two sets of DM-RS ports can share the same CDM group. In such embodiments, the overhead of a DM-RS port as part of one CDM group can be less than the overhead of a DM-RS port as part of more than one CDM group.

[0051] Figure 4 This is a schematic block diagram illustrating one embodiment of system 400, where joint transmissions occur from two TRPs to the UE. System 400 includes a first TRP 402, a second TRP 404, and a UE 406. The first TRP 402 communicates with the UE 406 via a first message 408 (e.g., CSI-RS1, DMRS group 1, CW1, RV0, PTRS1), and the second TRP 404 communicates with the UE 406 via a second message 410 (e.g., CSI-RS2, DMRS group 2, CW1, RV0, PTRS2).

[0052] In various embodiments, in a PDSCH joint transmission scheme, two TRPs (e.g., first TRP 402, second TRP 404) within the same cell can transmit their CSI-RS in separate CSI-RS resources. In such embodiments, separate CSI-RS resources are configured and transmitted for different TRPs. By separating the CSI-RS signals from different TRPs in the time and / or frequency domains, UE 406 can easily distinguish different DL signals from different TRPs with different path losses and different Doppler shifts and estimate each channel separately. NZP-CSI-RS resource pairs can be configured for channel measurement and interference measurement. For PDSCH transmission with a multi-TRP system, two TCI states can be indicated by TCI indicators (e.g., TCI fields) in DCI formats (e.g., DCI format 1_1, DCI format 1_2). Each TCI state can be associated with the DM-RS and DMRS ports of the PDSCH transmitted from the TRP. In some embodiments, the same number (e.g., K) of DM-RS ports can be transmitted by the two TRPs. In one example, assume the DM-RS port of the first TRP transmission is And the DM-RS port transmitted by the second TRP is In some single-DCI multi-TRP PDSCH transmission embodiments, all K ports transmitted by the same TRP are in one DMRS CDM group and a total of 2*K ports are in 2 CDM groups.

[0053] In some embodiments, the DMRS port transmitted by the TRP does not exclusively occupy a DMRS CDM group. For example, in some embodiments, if the indicated DMRS port comes from the same DMRS CDM group, the first K ports of the DMRS are associated with a first TCI state, and the remaining K ports of the DMRS are associated with a second TCI state indicated by the TCI indicator (e.g., the TCI field) in the DCI. As another example, in various embodiments, if the indicated DMRS port comes from two different CDM groups, the DMRS port in the first CDM group is associated with a first TCI state, and the DMRS port in the second CDM group is associated with a second TCI state. As can be appreciated, enabling DMRS ports to be transmitted in a single CDM group from two TRPs can have the benefit of reducing the number of CDM groups used for the UE. This can increase the number of REs used for data and / or increase MU-MIMO capacity for the number of UEs scheduled simultaneously. This can be seen from the DMRS port indications in Table 1.

[0054] Table 1: Antenna Ports (1000+DMRS Ports), dmrs-Type = 1, maxLength = 1

[0055]

[0056] The DMRS entries for values ​​2, 7, 8, 10, and 11 in Table 1 can be used in the above-described transmission scheme. For example, the row corresponding to a value of 2 indicates two DMRS ports transmitted in one CDM group, thereby enabling one data layer for SFN transmission. The rows corresponding to values ​​7 and 8 each indicate two DMRS ports in separate CDM groups, thereby enabling MU-MIMO for two UEs, each with one layer of data transmission. The row corresponding to a value of 11 indicates two DMRS ports in two CDM groups. The row corresponding to a value of 10 indicates four DMRS ports, where ports 0 and 1 are associated with a first TCI state and are in the first CDM group, and ports 2 and 3 are associated with a second TCI state and are in the second CDM group. Compared to other embodiments, the embodiments described herein can achieve greater scheduling flexibility. In various embodiments, the gNB may schedule one UE with two ports in one CDM group (e.g., the row corresponding to a value of 2) to save DMRS RE overhead, schedule one UE with two ports in two CDM groups (e.g., the row corresponding to a value of 11) to enable FDM between the two DMRS ports for channel estimation, and / or schedule two UEs, each with two ports in a CDM group (e.g., schedule a first UE with a row corresponding to a value of 7 and two ports in a first CDM group, and schedule a second UE with a row corresponding to a value of 8 and two ports in a second CDM group) for MU-MIMO transmission.

[0057] The diagram in Table 2 can be used in place of the simplified table in Table 1. By using a simplified table that includes only certain entries, transmission bandwidth and / or storage space can be reduced compared to using Table 1.

[0058] Table 2: Antenna Ports (1000+DMRS Ports), dmrs-Type = 1, maxLength = 1

[0059]

[0060] Similar to Tables 1 and 2, the DMRS port entries in Table 3 can be used to schedule SFN transmissions (e.g., entries with values ​​of 2, 7, 8, 10, 11, 20, 21, 22, 23, 28, 29, and 30 in one codeword portion, and entries with values ​​of 1 and 3 in two codeword portions). In some embodiments, the gNB can schedule UEs very flexibly by using Table 3. For example, in one embodiment, a single UE can be scheduled via DMRS based on the row corresponding to a value of 2 and ports 0 and 1 in one CDM group—one codeword portion—reducing DMRS RE overhead, and pairs of UEs, each with two DMRS ports in the CDM group, can be scheduled simultaneously (from one codeword portion) via DMRS based on rows corresponding to values ​​of 7 and 8 (or 20 and 21). In another example, in an embodiment for higher-order transmissions of rank 3 or rank 4, a single UE can be scheduled based on rows corresponding to values ​​of 1 or 3 (from two codeword portions). By using Table 3, the gNB can have flexibility similar to embodiments using Table 1. As can be understood, if the gNB uses dmrs-Type2 to schedule the UE, it can achieve benefits similar to those described in Tables 1 and 3.

[0061] Table 3: Antenna Ports (1000+DMRS Ports), dmrs-Type=1, maxLength=2

[0062]

[0063] The diagram in Table 4 can be used in place of the simplified table in Table 3. By using a simplified table that includes only certain entries, transmission bandwidth and / or storage space can be reduced compared to using Table 3.

[0064] Table 4: Antenna Ports (1000+DMRS Ports), dmrs-Type = 1, maxLength = 2

[0065]

[0066] In some embodiments, such as for data transmission in a PDSCH, K layers of data can be transmitted, and each data layer can be associated with a pair of DMRS ports. In various embodiments, if all 2K DMRS ports indicated by the DCI are in a single DMRS CDM group, the first K DMRS ports are associated with a first TCI state, while the remaining K DMRS ports are associated with a second TCI state indicated by the DCI's TCI indicator (e.g., TCI field). In some embodiments, if all 2K DMRS ports indicated by the DCI are in two DMRS CDM groups, the K DMRS ports in the first CDM group indicated by the first DMRS port are associated with the first TCI state, and the remaining K DMRS ports in the second CDM group are associated with the second TCI state indicated by the DCI's TCI indicator (e.g., TCI field). In some embodiments, for one or two CDM group embodiments, the first K ports can be associated with the first TCI and can be... Furthermore, the remaining K ports can be associated with the second TCI and can be In such an embodiment, the i-th data layer can be connected to a pair of DMRS ports. Relatedly. As can be understood, considering transmission reliability requirements, it may be reasonable to limit K ≤ 4 and allow only a single codeword to be transmitted in the PDSCH.

[0067] In the first example, based on Table 1 (dmrs-Type=1, maxLength=1) Figure 4 UE 406 is configured with DMRS. In this example, if the DCI format (e.g., DCI format 1-1) indicates to UE 406 a TCI code point with two TCI states (e.g., TCI1 = CSI-RS1, TCI2 = CSI-RS2), and the DMRS indication value is 2 (e.g., ports 0 and 1), UE 406 associates DMRS port 0 with TCI1 and DMRS port 1 with TCI2. Therefore, PDSCH is transmitted through a single data layer associated with both DMRS ports 0 and 1. In this example, if the DMRS indication value is 10 (ports 0-3), then DMRS ports 0 and 1 are in the first CDM group associated with TCI1 (containing DMRS port 0), and DMRS ports 2 and 3 are in the second CDM group associated with TCI2. Therefore, PDSCH data is transmitted in two layers, with the first data layer associated with DMRS ports 0 and 2, and the second data layer associated with DMRS ports 1 and 3.

[0068] In the second example, based on Table 3 (dmrs-Type = 1, maxLength = 2), both UEs (e.g., UE1 and UE2) are configured with DMRS. In this example, UE1 is scheduled with TCI state (TCI1 = CSI-RS1, TCI2 = CSI-RS2) and DMRS value = 7 (ports 0 and 1), and UE2 is scheduled with TCI state (TCI3 = CSI-RS1, TCI4 = CSI-RS2) and DMRS value = 8 (ports 2 and 3). Therefore, UE1 associates DMRS port 0 with TCI1 and DMRS port 1 with TCI2. A single data layer associated with DMRS ports 0 and 1 is transmitted to UE1 in PDSCH1. UE2 associates DMRS port 2 with TCI3 and DMRS port 3 with TCI4. A single data layer associated with DMRS ports 0 and 1 is transmitted to UE2 in PDSCH2. MU-MIMO transmission to UE1 and UE2 can be achieved through a total of two data layers to the two UEs.

[0069] In some embodiments, if the indicated DMRS port comes from a DMRS CDM group, a first half of the DMRS port may be associated with a first TCI state, and a second half of the DMRS port may be associated with a second TCI state. In some embodiments, if the indicated DMRS port comes from two DMRS CDM groups, the DMRS port in the first CDM group is associated with a first TCI state, and the second DMRS port in the second CDM group is associated with a second TCI state. In various embodiments, DMRS ports are divided into two groups of equal size with different TCIs. For example, let the DMRS port with the first TCI be... And it has a DM-RS port with a second TCI. A pair of DMRS ports with different TCIs, i.e. It can be used for the transmission of the k-th data layer of PDSCH.

[0070] Figure 5 This is a schematic flowchart illustrating an embodiment of a method 500 for indicating the state of a transmission control indicator. In some embodiments, method 500 is performed by a device such as network unit 104. In some embodiments, method 500 may be performed by a processor (e.g., microcontroller, microprocessor, CPU, GPU, auxiliary processing unit, FPGA, etc.) that executes program code.

[0071] Method 500 may include transmitting 502 to a user equipment (e.g., remote unit 102) a downlink control information format indicating a physical downlink shared channel to the user equipment, wherein: the physical downlink shared channel includes two transmission control indicator states corresponding to a plurality of demodulation reference signal antenna ports; a first transmission control indicator state of the two transmission control indicator states is associated with a first set of demodulation reference signal antenna ports of the plurality of demodulation reference signal antenna ports; a second transmission control indicator state of the two transmission control indicator states is associated with a second set of demodulation reference signal antenna ports of the plurality of demodulation reference signal antenna ports; and a first number of demodulation reference signal antenna ports in the first set of demodulation reference signal antenna ports is equal to a second number of demodulation reference signal antenna ports in the second set of demodulation reference signal antenna ports.

[0072] In some embodiments: a plurality of demodulation reference signal antenna ports are in a single demodulation reference signal code division multiplexing group; a first set of demodulation reference signal antenna ports corresponds to a first half of the plurality of demodulation reference signal antenna ports; and a second set of demodulation reference signal antenna ports corresponds to a second half of the plurality of demodulation reference signal antenna ports. In some embodiments: a plurality of demodulation reference signal antenna ports are in two demodulation reference signal code division multiplexing groups; a first set of demodulation reference signal antenna ports corresponds to a first demodulation reference signal code division multiplexing group in the two demodulation reference signal code division multiplexing groups; and a second set of demodulation reference signal antenna ports corresponds to a second demodulation reference signal code division multiplexing group in the two demodulation reference signal code division multiplexing groups.

[0073] In various embodiments, each data layer of the physical downlink shared channel is configured to transmit using a pair of demodulation reference signal ports from a plurality of demodulation reference signal antenna ports with different transmission control indicator states. In one embodiment, a first demodulation reference signal port in a first set of demodulation reference signal antenna ports is paired with a corresponding second demodulation reference signal port in a second set of demodulation reference signal antenna ports for transmission of the corresponding data layer of the physical downlink shared channel. In some embodiments, a first transmission control indicator state indicates type A quasi-co-addressing and type D quasi-co-addressing for frequency range 2 of a first transmission receiver point, and a second transmission control indicator state indicates type A quasi-co-addressing and type D quasi-co-addressing for frequency range 2 of a second transmission receiver point.

[0074] In some embodiments, method 500 further includes transmitting a physical downlink shared channel to a user equipment having two transmission control indicator states and multiple demodulation reference signal antenna ports based on a downlink control information format. In various embodiments, the downlink control information format includes downlink control information format 1_1 or downlink control information format 1_2.

[0075] In one embodiment, method 500 further includes receiving a capability report of the user equipment, wherein the capability report includes information indicating the user equipment's ability to receive downlink control information format. In some embodiments, method 500 further includes transmitting an indication of a demodulation reference signal port used based on a first demodulation reference signal indication table having a first size, wherein the first size is smaller than a second size of a second demodulation reference signal indication table.

[0076] Figure 6 This is a schematic flowchart illustrating another embodiment of a method 600 for indicating the state of a transmission control indicator for downlink control information. In some embodiments, method 600 is performed by a device such as remote unit 102. In some embodiments, method 600 may be performed by a processor (e.g., microcontroller, microprocessor, CPU, GPU, auxiliary processing unit, FPGA, etc.) that executes program code.

[0077] Method 600 may include receiving, at a user equipment (e.g., remote unit 102), a downlink control information format indicating a physical downlink shared channel, wherein: the physical downlink shared channel includes two transmission control indicator states corresponding to a plurality of demodulation reference signal antenna ports; a first transmission control indicator state of the two transmission control indicator states is associated with a first set of demodulation reference signal antenna ports of the plurality of demodulation reference signal antenna ports; a second transmission control indicator state of the two transmission control indicator states is associated with a second set of demodulation reference signal antenna ports of the plurality of demodulation reference signal antenna ports; and a first number of demodulation reference signal antenna ports in the first set of demodulation reference signal antenna ports is equal to a second number of demodulation reference signal antenna ports in the second set of demodulation reference signal antenna ports.

[0078] In some embodiments: a plurality of demodulation reference signal antenna ports are in a single demodulation reference signal code division multiplexing group; a first set of demodulation reference signal antenna ports corresponds to a first half of the plurality of demodulation reference signal antenna ports; and a second set of demodulation reference signal antenna ports corresponds to a second half of the plurality of demodulation reference signal antenna ports. In some embodiments: a plurality of demodulation reference signal antenna ports are in two demodulation reference signal code division multiplexing groups; a first set of demodulation reference signal antenna ports corresponds to a first demodulation reference signal code division multiplexing group in the two demodulation reference signal code division multiplexing groups; and a second set of demodulation reference signal antenna ports corresponds to a second demodulation reference signal code division multiplexing group in the two demodulation reference signal code division multiplexing groups.

[0079] In various embodiments, each data layer of the physical downlink shared channel is configured to be received using a pair of demodulation reference signal ports from a plurality of demodulation reference signal antenna ports with different transmission control indicator states. In one embodiment, a first demodulation reference signal port in a first set of demodulation reference signal antenna ports is paired with a corresponding second demodulation reference signal port in a second set of demodulation reference signal antenna ports for receiving the corresponding data layer of the physical downlink shared channel. In some embodiments, a first transmission control indicator state indicates type A quasi-co-addressing and type D quasi-co-addressing for frequency range 2 of a first transmission receiving point, and a second transmission control indicator state indicates type A quasi-co-addressing and type D quasi-co-addressing for frequency range 2 of a second transmission receiving point.

[0080] In some embodiments, method 600 further includes receiving a physical downlink shared channel having two transmission control indicator states and a plurality of demodulation reference signal antenna ports based on a downlink control information format. In various embodiments, the downlink control information format includes downlink control information format 1_1 or downlink control information format 1_2. In one embodiment, method 600 further includes transmitting a user equipment capability report, wherein the capability report includes information indicating the user equipment's ability to receive the downlink control information format. In some embodiments, method 600 further includes receiving an indication of a demodulation reference signal port used based on a first demodulation reference signal indication table having a first size, wherein the first size is smaller than a second size of a second demodulation reference signal indication table.

[0081] In one embodiment, a method includes: transmitting to a user equipment a downlink control information format indicating a physical downlink shared channel, wherein: the physical downlink shared channel includes two transmission control indicator states corresponding to a plurality of demodulation reference signal antenna ports; a first transmission control indicator state of the two transmission control indicator states is associated with a first set of demodulation reference signal antenna ports of the plurality of demodulation reference signal antenna ports; a second transmission control indicator state of the two transmission control indicator states is associated with a second set of demodulation reference signal antenna ports of the plurality of demodulation reference signal antenna ports; and a first number of demodulation reference signal antenna ports in the first set of demodulation reference signal antenna ports is equal to a second number of demodulation reference signal antenna ports in the second set of demodulation reference signal antenna ports.

[0082] In some embodiments: a plurality of demodulation reference signal antenna ports are in a single demodulation reference signal code division multiplexing group; a first set of demodulation reference signal antenna ports corresponds to a first half of the plurality of demodulation reference signal antenna ports; and a second set of demodulation reference signal antenna ports corresponds to a second half of the plurality of demodulation reference signal antenna ports.

[0083] In some embodiments: a plurality of demodulation reference signal antenna ports are in two demodulation reference signal code division multiplexing groups; a first set of demodulation reference signal antenna ports corresponds to a first demodulation reference signal code division multiplexing group in the two demodulation reference signal code division multiplexing groups; and a second set of demodulation reference signal antenna ports corresponds to a second demodulation reference signal code division multiplexing group in the two demodulation reference signal code division multiplexing groups.

[0084] In various embodiments, each data layer of the physical downlink shared channel is configured to transmit using a pair of demodulation reference signal ports from a plurality of demodulation reference signal antenna ports with different transmission control indicator states.

[0085] In one embodiment, a first demodulation reference signal port in a first set of demodulation reference signal antenna ports is paired with a corresponding second demodulation reference signal port in a second set of demodulation reference signal antenna ports for transmission of the corresponding data layer of the physical downlink shared channel.

[0086] In some embodiments, a first transmission control indicator state indicates type A quasi-co-address and type D quasi-co-address for frequency range 2 of a first transmission receiving point, and a second transmission control indicator state indicates type A quasi-co-address and type D quasi-co-address for frequency range 2 of a second transmission receiving point.

[0087] In some embodiments, the method further includes transmitting a physical downlink shared channel to a user equipment having two transmission control indicator states and multiple demodulation reference signal antenna ports based on a downlink control information format.

[0088] In various embodiments, the downlink control information format includes downlink control information format 1_1 or downlink control information format 1_2.

[0089] In one embodiment, the method further includes receiving a capability report from the user equipment, wherein the capability report includes information indicating the user equipment's ability to receive downlink control information in a specific format.

[0090] In some embodiments, the method further includes transmitting an indication of a demodulation reference signal port used based on a first demodulation reference signal indication table having a first size, wherein the first size is smaller than a second size of a second demodulation reference signal indication table.

[0091] In one embodiment, an apparatus includes: a transmitter that transmits downlink control information format indicating a physical downlink shared channel to a user equipment, wherein: the physical downlink shared channel includes two transmission control indicator states corresponding to a plurality of demodulation reference signal antenna ports; a first transmission control indicator state of the two transmission control indicator states is associated with a first set of demodulation reference signal antenna ports of the plurality of demodulation reference signal antenna ports; a second transmission control indicator state of the two transmission control indicator states is associated with a second set of demodulation reference signal antenna ports of the plurality of demodulation reference signal antenna ports; and a first number of demodulation reference signal antenna ports in the first set of demodulation reference signal antenna ports is equal to a second number of demodulation reference signal antenna ports in the second set of demodulation reference signal antenna ports.

[0092] In some embodiments: a plurality of demodulation reference signal antenna ports are in a single demodulation reference signal code division multiplexing group; a first set of demodulation reference signal antenna ports corresponds to a first half of the plurality of demodulation reference signal antenna ports; and a second set of demodulation reference signal antenna ports corresponds to a second half of the plurality of demodulation reference signal antenna ports.

[0093] In some embodiments: a plurality of demodulation reference signal antenna ports are in two demodulation reference signal code division multiplexing groups; a first set of demodulation reference signal antenna ports corresponds to a first demodulation reference signal code division multiplexing group in the two demodulation reference signal code division multiplexing groups; and a second set of demodulation reference signal antenna ports corresponds to a second demodulation reference signal code division multiplexing group in the two demodulation reference signal code division multiplexing groups.

[0094] In various embodiments, each data layer of the physical downlink shared channel is configured to transmit using a pair of demodulation reference signal ports from a plurality of demodulation reference signal antenna ports with different transmission control indicator states.

[0095] In one embodiment, a first demodulation reference signal port in a first set of demodulation reference signal antenna ports is paired with a corresponding second demodulation reference signal port in a second set of demodulation reference signal antenna ports for transmission of the corresponding data layer of the physical downlink shared channel.

[0096] In some embodiments, a first transmission control indicator state indicates type A quasi-co-address and type D quasi-co-address for frequency range 2 of a first transmission receiving point, and a second transmission control indicator state indicates type A quasi-co-address and type D quasi-co-address for frequency range 2 of a second transmission receiving point.

[0097] In some embodiments, the transmitter transmits a physical downlink shared channel to the user equipment based on a downlink control information format, which has two transmission control indicator states and multiple demodulation reference signal antenna ports.

[0098] In various embodiments, the downlink control information format includes downlink control information format 1_1 or downlink control information format 1_2.

[0099] In one embodiment, the apparatus further includes a receiver that receives a capability report of the user equipment, wherein the capability report includes information indicating the user equipment's ability to receive downlink control information in a specific format.

[0100] In some embodiments, the transmitter transmits an indication of a demodulation reference signal port based on a first demodulation reference signal indication table having a first size, wherein the first size is smaller than a second size of a second demodulation reference signal indication table.

[0101] In one embodiment, a method includes: receiving at a user equipment a downlink control information format indicating a physical downlink shared channel, wherein: the physical downlink shared channel includes two transmission control indicator states corresponding to a plurality of demodulation reference signal antenna ports; a first transmission control indicator state of the two transmission control indicator states is associated with a first set of demodulation reference signal antenna ports of the plurality of demodulation reference signal antenna ports; a second transmission control indicator state of the two transmission control indicator states is associated with a second set of demodulation reference signal antenna ports of the plurality of demodulation reference signal antenna ports; and a first number of demodulation reference signal antenna ports in the first set of demodulation reference signal antenna ports is equal to a second number of demodulation reference signal antenna ports in the second set of demodulation reference signal antenna ports.

[0102] In some embodiments: a plurality of demodulation reference signal antenna ports are in a single demodulation reference signal code division multiplexing group; a first set of demodulation reference signal antenna ports corresponds to a first half of the plurality of demodulation reference signal antenna ports; and a second set of demodulation reference signal antenna ports corresponds to a second half of the plurality of demodulation reference signal antenna ports.

[0103] In some embodiments: a plurality of demodulation reference signal antenna ports are in two demodulation reference signal code division multiplexing groups; a first set of demodulation reference signal antenna ports corresponds to a first demodulation reference signal code division multiplexing group in the two demodulation reference signal code division multiplexing groups; and a second set of demodulation reference signal antenna ports corresponds to a second demodulation reference signal code division multiplexing group in the two demodulation reference signal code division multiplexing groups.

[0104] In various embodiments, each data layer of the physical downlink shared channel is configured to receive using a pair of demodulation reference signal ports from a plurality of demodulation reference signal antenna ports with different transmission control indicator states.

[0105] In one embodiment, a first demodulation reference signal port in a first set of demodulation reference signal antenna ports is paired with a corresponding second demodulation reference signal port in a second set of demodulation reference signal antenna ports for receiving the corresponding data layer of the physical downlink shared channel.

[0106] In some embodiments, a first transmission control indicator state indicates type A quasi-co-address and type D quasi-co-address for frequency range 2 of a first transmission receiving point, and a second transmission control indicator state indicates type A quasi-co-address and type D quasi-co-address for frequency range 2 of a second transmission receiving point.

[0107] In some embodiments, the method further includes receiving a physical downlink shared channel having two transmission control indicator states and the plurality of demodulation reference signal antenna ports based on a downlink control information format.

[0108] In various embodiments, the downlink control information format includes downlink control information format 1_1 or downlink control information format 1_2.

[0109] In one embodiment, the method further includes transmitting a capability report of the user equipment, wherein the capability report includes information indicating the user equipment's ability to receive downlink control information in a specific format.

[0110] In some embodiments, the method further includes receiving an indication of a demodulation reference signal port used based on a first demodulation reference signal indication table having a first size, wherein the first size is smaller than a second size of a second demodulation reference signal indication table.

[0111] In one embodiment, an apparatus includes a user equipment, the apparatus further comprising: a receiver receiving a downlink control information format indicating a physical downlink shared channel, wherein: the physical downlink shared channel includes two transmission control indicator states corresponding to a plurality of demodulation reference signal antenna ports; a first transmission control indicator state of the two transmission control indicator states is associated with a first set of demodulation reference signal antenna ports of the plurality of demodulation reference signal antenna ports; a second transmission control indicator state of the two transmission control indicator states is associated with a second set of demodulation reference signal antenna ports of the plurality of demodulation reference signal antenna ports; and a first number of demodulation reference signal antenna ports in the first set of demodulation reference signal antenna ports is equal to a second number of demodulation reference signal antenna ports in the second set of demodulation reference signal antenna ports.

[0112] In some embodiments: a plurality of demodulation reference signal antenna ports are in a single demodulation reference signal code division multiplexing group; a first set of demodulation reference signal antenna ports corresponds to a first half of the plurality of demodulation reference signal antenna ports; and a second set of demodulation reference signal antenna ports corresponds to a second half of the plurality of demodulation reference signal antenna ports.

[0113] In some embodiments: a plurality of demodulation reference signal antenna ports are in two demodulation reference signal code division multiplexing groups; a first set of demodulation reference signal antenna ports corresponds to a first demodulation reference signal code division multiplexing group in the two demodulation reference signal code division multiplexing groups; and a second set of demodulation reference signal antenna ports corresponds to a second demodulation reference signal code division multiplexing group in the two demodulation reference signal code division multiplexing groups.

[0114] In various embodiments, each data layer of the physical downlink shared channel is configured to receive using a pair of demodulation reference signal ports from a plurality of demodulation reference signal antenna ports with different transmission control indicator states.

[0115] In one embodiment, a first demodulation reference signal port in a first set of demodulation reference signal antenna ports is paired with a corresponding second demodulation reference signal port in a second set of demodulation reference signal antenna ports for receiving the corresponding data layer of the physical downlink shared channel.

[0116] In some embodiments, a first transmission control indicator state indicates type A quasi-co-address and type D quasi-co-address for frequency range 2 of a first transmission receiving point, and a second transmission control indicator state indicates type A quasi-co-address and type D quasi-co-address for frequency range 2 of a second transmission receiving point.

[0117] In some embodiments, the receiver receives a physical downlink shared channel having two transmission control indicator states and multiple demodulation reference signal antenna ports based on a downlink control information format.

[0118] In various embodiments, the downlink control information format includes downlink control information format 1_1 or downlink control information format 1_2.

[0119] In one embodiment, the apparatus further includes a transmitter that transmits a capability report of the user equipment, wherein the capability report includes information indicating the user equipment's ability to receive downlink control information in a specific format.

[0120] In some embodiments, the receiver receives an indication of a demodulation reference signal port used based on a first demodulation reference signal indication table having a first size, wherein the first size is smaller than a second size of a second demodulation reference signal indication table.

[0121] Other specific embodiments may be practiced. The described embodiments should be considered in all respects as illustrative rather than restrictive. Therefore, the scope of the invention is indicated by the appended claims rather than the foregoing description. All variations within the meaning and equivalents of the claims are covered within its scope.

Claims

1. A method performed by a network unit, the method comprising: Transmit downlink control information format to user equipment, wherein the downlink control information format indicates the physical downlink shared channel, wherein: The physical downlink shared channel includes two transmission control indicator states corresponding to multiple demodulation reference signal antenna ports; The first transmission control indicator state of the two transmission control indicator states is associated with a first set of demodulation reference signal antenna ports among the plurality of demodulation reference signal antenna ports; The second transmission control indicator state of the two transmission control indicator states is associated with a second set of demodulation reference signal antenna ports among the plurality of demodulation reference signal antenna ports; and The first number of demodulation reference signal antenna ports in the first set of demodulation reference signal antenna ports is equal to the second number of demodulation reference signal antenna ports in the second set of demodulation reference signal antenna ports. Wherein, the first transmission control indicator state indicates type A quasi-co-address and type D quasi-co-address for frequency range 2 of the first transmission receiving point, and the second transmission control indicator state indicates type A quasi-co-address and type D quasi-co-address for frequency range 2 of the second transmission receiving point.

2. The method according to claim 1, wherein: The plurality of demodulation reference signal antenna ports are in a single demodulation reference signal code division multiplexing group; The first set of demodulation reference signal antenna ports corresponds to the first half of the plurality of demodulation reference signal antenna ports; and The second set of demodulation reference signal antenna ports corresponds to the second half of the plurality of demodulation reference signal antenna ports.

3. The method according to claim 1, wherein: The plurality of demodulation reference signal antenna ports are in two demodulation reference signal code division multiplexing groups; The first set of demodulation reference signal antenna ports corresponds to the first demodulation reference signal code division multiplexing group in the two demodulation reference signal code division multiplexing groups; and The second set of demodulation reference signal antenna ports corresponds to the second demodulation reference signal code division multiplexing group in the two demodulation reference signal code division multiplexing groups.

4. The method according to claim 1, wherein, Each data layer of the physical downlink shared channel is configured to transmit using a pair of demodulation reference signal ports from among the plurality of demodulation reference signal antenna ports with different transmission control indicator states.

5. The method according to claim 4, wherein, The first demodulation reference signal port in the first set of demodulation reference signal antenna ports is paired with the corresponding second demodulation reference signal port in the second set of demodulation reference signal antenna ports for transmission in the corresponding data layer of the physical downlink shared channel.

6. A method performed by a user equipment, the method comprising: Receive downlink control information format indicating the physical downlink shared channel, wherein: The physical downlink shared channel includes two transmission control indicator states corresponding to multiple demodulation reference signal antenna ports; The first transmission control indicator state of the two transmission control indicator states is associated with a first set of demodulation reference signal antenna ports among the plurality of demodulation reference signal antenna ports; The second transmission control indicator state of the two transmission control indicator states is associated with a second set of demodulation reference signal antenna ports among the plurality of demodulation reference signal antenna ports; and The first number of demodulation reference signal antenna ports in the first set of demodulation reference signal antenna ports is equal to the second number of demodulation reference signal antenna ports in the second set of demodulation reference signal antenna ports. Wherein, the first transmission control indicator state indicates type A quasi-co-address and type D quasi-co-address for frequency range 2 of the first transmission receiving point, and the second transmission control indicator state indicates type A quasi-co-address and type D quasi-co-address for frequency range 2 of the second transmission receiving point.

7. The method according to claim 6, wherein: The plurality of demodulation reference signal antenna ports are in a single demodulation reference signal code division multiplexing group; The first set of demodulation reference signal antenna ports corresponds to the first half of the plurality of demodulation reference signal antenna ports; and The second set of demodulation reference signal antenna ports corresponds to the second half of the plurality of demodulation reference signal antenna ports.

8. The method according to claim 6, wherein: The plurality of demodulation reference signal antenna ports are in two demodulation reference signal code division multiplexing groups; The first set of demodulation reference signal antenna ports corresponds to the first demodulation reference signal code division multiplexing group in the two demodulation reference signal code division multiplexing groups; and The second set of demodulation reference signal antenna ports corresponds to the second demodulation reference signal code division multiplexing group in the two demodulation reference signal code division multiplexing groups.

9. The method according to claim 6, wherein, Each data layer of the physical downlink shared channel is configured to receive using a pair of demodulation reference signal ports from among the plurality of demodulation reference signal antenna ports with different transmission control indicator states.

10. The method according to claim 9, wherein, The first demodulation reference signal port in the first set of demodulation reference signal antenna ports is paired with the corresponding second demodulation reference signal port in the second set of demodulation reference signal antenna ports to receive the corresponding data layer of the physical downlink shared channel.

11. The method of claim 6, further comprising receiving the physical downlink shared channel having the two transmission control indicator states and the plurality of demodulation reference signal antenna ports based on the downlink control information format.

12. The method according to claim 6, wherein, The downlink control information format includes downlink control information format 1_1 or downlink control information format 1_2.

13. The method of claim 6, further comprising transmitting a capability report of the user equipment, wherein, The capability report includes information indicating the user equipment's ability to receive the downlink control information format.

14. The method of claim 6, further comprising receiving an indication of a demodulation reference signal port used based on a first demodulation reference signal indication table having a first size, wherein, The first size is smaller than the second size of the second demodulation reference signal indicator.

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