Data transmission using multiple transmission reception points

Abstract

Apparatus, methods and systems for data transmission using multiple transmission reception points are disclosed. A method (600) includes sending (602) a downlink control information format to a user equipment in a downlink control channel, wherein: the downlink control information format includes a transmission configuration indication field; the transmission configuration indication field indicates two transmission configuration indication states; and each of the two transmission configuration indication states includes parameters for configuring a quasi-co-location relationship that associates at least one downlink reference signal resource with a demodulation reference signal of a downlink data channel. The method (600) includes sending (604) a downlink data channel from two transmission reception points, wherein each of the two transmission reception points sends each data layer of one or more data layers and a demodulation reference signal associated with each data layer.

Description

Technical Field

[0001] The subject matter disclosed herein relates generally to wireless communications and, more particularly, to data transmission using multiple transmission reception points. Background Art

[0002] The following abbreviations are defined herein, at least some of which are referenced in the following description: 3rd Generation Partnership Project (“3GPP”), 5G QoS Indicator (“5QI”), Acknowledgement Mode (“AM”), Aperiodic (“AP”), Backhaul (“BH”), Broadcast Multicast (“BM”), Buffer Occupancy (“BO”), Base Station (“BS”), Buffer Status Report (“BSR”), Bandwidth (“BW”), Bandwidth Part (“BWP”), Carrier Aggregation (“CA”), Component Carrier (“CC”), Code Division Multiplexing (“CDM”), Control Element (“CE”), Coordinated Multipoint (“CoMP”), Class of Requirement (“CoR”), Control Resource Set (“CORESET”), Cyclic Prefix (“CP”), Cyclic Prefix OFDM (“CP-OFDM”), 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”), code word (“CW”), downlink assignment index (“DAI”), downlink control information (“DCI”), downlink (“DL”), discrete Fourier transform spread 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 Multiple Access (“FDMA”), Frequency Range (“FR”), 450 MHz–6000 MHz (“FR1”), 24250 MHz–52600 MHz (“FR2”), Hybrid Automatic Repeat Request (“HARQ”), High Definition Multimedia Interface (“HDMI”), Integrated Access Backhaul (“IAB”), Identity or Identifier or Identity (“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"), long term evolution ("LTE"), level of automation ("LoA"), medium access control ("MAC"), modulation and coding scheme ("MCS"), multi-DCI ("M-DCI"),Master Information Block (“MIB”), Multiple Input Multiple Output (“MIMO”), Mobile Terminal (“MT”), Machine Type Communication (“MTC”), Multiple PDSCH (“Multi-PDSCH”), Multiple TRP (“M-TRP”), Multi-User (“MU”), Multi-User MIMO (“MU-MIMO”), Minimum Mean Square Error (“MMSE”), Negative Acknowledgement (“NACK”) or (“NAK”), 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 ("PDN") LMN”), Precoding Matrix Indicator (“PMI”), ProSe Per-Packet Priority (“PPPP”), ProSe Per-Packet Reliability (“PPPR”), Physical Resource Block (“PRB”), Switched Packets (“PS”), Physical Sidelink Control Channel (“PSCCH”), Physical Sidelink Shared Channel (“PSSCH”), Phase Tracking RS (“PTRS” or “PT-RS”), Physical Uplink Control Channel (“PUCCH”), Physical Uplink Shared Channel (“PUSCH”), Quasi Co-location (“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 (“RS RP”), Reference Signal Received Quality (“RSRQ”), Reception (“RX”), Single Carrier Frequency Domain Spread Spectrum (“SC-FDSS”), Secondary Cell (“SCell”), Subcarrier Spacing (“SCS”), Single DCI (“S-DCI”), Spatial Division Multiplexing (“SDM”), Service Data Unit (“SDU”), Single Frequency Network (“SFN”), Subscriber Identity Module (“SIM”), Signal-to-Interference and 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"), Temporary Mobile Subscriber Identity ("TMSI"), Transmitted Precoding Matrix Indicator ("TPMI"), Transmission Reception Point ("TRP"), Technology Standard ("TS"), Transmission ("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"), universal subscriber identity module ("USIM"), universal terrestrial radio access network ("UTRAN"), vehicle-to-everything ("V2X"), voice over IP ("VoIP"), access to public land mobile network ("VPLMN"), vehicle RNTI ("V-RNTI"), world interoperability for microwave access ("WiMAX"), zero forcing ("ZF"), zero power ("ZP"), and ZP CSI-RS ("ZP-CSI-RS"). As used herein, "HARQ-ACK" may collectively represent a positive acknowledgement ("ACK") and a negative acknowledgement ("NAK"). ACK means that the TB is correctly received, while NAK means that the TB is erroneously received.

[0003] In some wireless communication networks, UEs may travel at high speeds. Summary of the invention

[0004] Methods for data transmission using multiple transmission reception points are disclosed. Apparatus and systems also perform the functions of these methods. In one embodiment, the method includes sending a downlink control information format to a user equipment in a downlink control channel, wherein: the downlink control information format includes a transmission configuration indication field; the transmission configuration indication field indicates two transmission configuration indication states; and each of the two transmission configuration indication states contains parameters for configuring a quasi-co-location relationship that associates at least one downlink reference signal resource with a demodulation reference signal of a downlink data channel. In certain embodiments, the method includes sending a downlink data channel from two transmission reception points, wherein each of the two transmission reception points sends each data layer of one or more data layers and a demodulation reference signal associated with each data layer.

[0005] In one embodiment, a device for transmitting data using multiple transmission receiving points includes a transmitter, which: sends a downlink control information format to a user equipment in a downlink control channel, wherein: the downlink control information format includes a transmission configuration indication field; the transmission configuration indication field indicates two transmission configuration indication states; and each of the two transmission configuration indication states contains parameters for configuring a quasi-co-site relationship that associates at least one downlink reference signal resource with a demodulation reference signal of a downlink data channel; and sends a downlink data channel from two transmission receiving points, wherein each of the two transmission receiving points sends each data layer of one or more data layers and a demodulation reference signal associated with each data layer.

[0006] A method for data transmission using multiple transmission reception points, comprising receiving a downlink control information format from a network element in a downlink control channel, wherein: the downlink control information format comprises a transmission configuration indication field; the transmission configuration indication field indicates two transmission configuration indication states; and each of the two transmission configuration indication states comprises parameters for configuring a quasi-co-location relationship of associating at least one downlink reference signal resource with a demodulation reference signal of a downlink data channel. In some embodiments, the method comprises receiving a downlink data channel, wherein each data layer of one or more data layers and a demodulation reference signal associated with each data layer are associated with two transmission configuration indication states.

[0007] In one embodiment, a device for transmitting data using multiple transmission receiving points includes a receiver, which: receives a downlink control information format from a network unit in a downlink control channel, wherein: the downlink control information format includes a transmission configuration indication field; the transmission configuration indication field indicates two transmission configuration indication states; and each of the two transmission configuration indication states contains parameters for configuring a quasi-co-site relationship that associates at least one downlink reference signal resource with a demodulation reference signal of a downlink data channel; and receives a downlink data channel, wherein each of one or more data layers and the demodulation reference signal associated with each data layer are associated with the two transmission configuration indication states. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] A more particular description of the embodiments briefly described above will be rendered by reference to specific embodiments illustrated in the accompanying drawings. Understanding that these drawings depict only some embodiments and are therefore not to be considered limiting of scope, the embodiments will be described and explained with additional specificity and detail through the use of the accompanying drawings, in which:

[0009] Figure 1is a schematic block diagram illustrating one embodiment of a wireless communication system for data transmission using multiple transmission reception points;

[0010] Figure 2 is a schematic block diagram illustrating one embodiment of an apparatus that may be used for data transmission using multiple transmission reception points;

[0011] Figure 3 is a schematic block diagram illustrating one embodiment of an apparatus that may be used for data transmission using multiple transmission reception points;

[0012] Figure 4 is a schematic block diagram illustrating one embodiment of a system including communicating with a UE traveling at high speed;

[0013] Figure 5 is a schematic block diagram illustrating another embodiment of a system including communicating with a UE traveling at high speed;

[0014] Figure 6 is a schematic flow chart illustrating one embodiment of a method for data transmission using multiple transmission reception points; and

[0015] Figure 7 is a schematic flow chart illustrating another embodiment of a method for data transmission using multiple transmission reception points. DETAILED DESCRIPTION

[0016] As will be appreciated by those skilled in the art, aspects of the embodiments may be embodied as systems, devices, methods or program products. Therefore, the embodiments may take the form of a complete hardware embodiment, a complete software embodiment (including firmware, resident software, microcode, etc.) or a combination of software and hardware aspects, which may generally be referred to herein as "circuit", "module" or "system". In addition, the embodiments may 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 may be tangible, non-temporary and / or non-transmitting. The storage device may not embody a signal. In a certain embodiment, the storage device only employs a signal for accessing the code.

[0017] Certain functional units described in this specification may be labeled as modules in order to more specifically emphasize their implementation independence. For example, a module may be implemented as a hardware circuit including a custom very large scale integration ("VLSI") circuit or gate array, an off-the-shelf semiconductor such as a logic chip, a transistor, or other discrete components. A module may also be implemented in a programmable hardware device such as a field programmable gate array, a programmable array logic, a programmable logic device, or the like.

[0018] Modules may also be implemented in code and / or software to be executed by various types of processors. The identified code modules may, for example, include 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 need not be physically located together, but may include unrelated instructions stored in different locations, which, when logically connected together, comprise the module and achieve the stated purpose of the module.

[0019] In fact, a code module can be a single instruction or many instructions, and can even be distributed on several different code segments, among different programs and across several memory devices. Similarly, in this article, operating data can be identified and illustrated in a module, and can be embodied in any suitable form and organized in a data structure of any suitable type. Operating data can be collected as a single data set, or can be distributed in different locations included on different computer-readable storage devices. When a module or part of a module is implemented with software, the software portion is stored on one or more computer-readable storage devices.

[0020] Any combination of one or more computer readable media may be utilized. The computer readable medium may be a computer readable storage medium. The computer readable storage medium may be a storage device storing code. The storage device may be, for example, but not limited to, an electronic, magnetic, optical, electromagnetic, infrared, holographic, micromechanical or semiconductor system, apparatus or device, or any suitable combination of the foregoing.

[0021] More specific examples of storage devices (a non-exhaustive list) would include the following: 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), a portable compact disc read-only memory ("CD-ROM"), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing. In the context of this document, a computer-readable storage medium may be any tangible medium that can contain or store a program for use by or in connection with an instruction execution system, apparatus, or device.

[0022] The code for performing the operations of the embodiments may be any number of lines and may 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 languages. The code may be executed entirely on the user's computer, partially on the user's computer, partially on the user's computer as a separate software package, partially on a remote computer, or entirely on a remote computer or server. In the last scenario, the remote computer may 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 may be connected to an external computer (e.g., via the Internet using an Internet service provider).

[0023] References to "one embodiment", "embodiment" or similar language in this specification are intended to mean that the specific features, structures or characteristics described in conjunction with the embodiment are included in at least one embodiment. Therefore, unless otherwise expressly stated, the phrases "in one embodiment", "in an embodiment" and similar language that appear throughout the specification may but do not necessarily all refer to the same embodiment, but rather mean "one or more but not all embodiments". Unless otherwise expressly stated, the terms "include", "comprise", "have" and their variations mean "including but not limited to". Unless otherwise expressly stated, the list of items listed does not imply that any or all items are mutually exclusive. Unless otherwise expressly stated, the terms "a", "an" and "the" also refer to "one or more".

[0024] In addition, the features, structures or characteristics of the described embodiments may be combined in any suitable manner. In the following description, many specific details are provided, such as examples of programming, software modules, user selections, network transactions, database queries, database structures, hardware modules, hardware circuits, hardware chips, etc., to provide a thorough understanding of the embodiments. However, those skilled in the art will recognize that the embodiments may be practiced without one or more specific details, or using other methods, components, materials, etc. In other cases, well-known structures, materials or operations are not shown or described in detail to avoid obscuring aspects of the embodiments.

[0025] Various aspects of the embodiments are described below with reference to schematic flow charts and / or schematic block diagrams of the methods, devices, systems, and program products according to the embodiments. It will be understood that each frame of the schematic flow charts and / or schematic block diagrams and the combination of frames in the schematic flow charts and / or schematic block diagrams can be implemented by code. The code can be provided to a processor of a general-purpose computer, a special-purpose computer, or other programmable data processing device to produce a machine, so that instructions executed by the processor of the computer or other programmable data processing device create a device for implementing the functions / operations specified in the schematic flow charts and / or schematic block diagram frames or multiple frames.

[0026] The code may also be stored in a storage device that is capable of instructing a computer, other programmable data processing apparatus, or other device to operate in a specific manner so that the instructions stored in the storage device produce an article of manufacture including instructions that implement the functions / operations specified in the schematic flowchart and / or schematic block diagram box or multiple boxes.

[0027] The code may also be loaded onto a computer, other programmable data processing apparatus, or other device so that a series of operational steps are performed on the computer, other programmable apparatus, or other device to produce a computer-implemented process, so that the code executed on the computer or other programmable apparatus provides a process for implementing the functions / operations specified in the flowchart and / or block diagram box or multiple boxes.

[0028] The schematic flow charts and / or schematic block diagrams in the accompanying drawings illustrate possible implementation architectures, functions, and operations of devices, systems, methods, and program products according to various embodiments. In this regard, each box in the schematic flow charts and / or schematic block diagrams may represent a module, segment, or portion of a code, which includes one or more executable instructions of a code for implementing a specified (multiple) logical function.

[0029] It should also be noted that in some alternative implementations, the functions annotated in the blocks may not occur in the order annotated in the drawings. For example, two blocks shown in succession may actually be executed substantially simultaneously, or the blocks may sometimes be executed in reverse order, depending on the functionality involved. Other steps and methods are contemplated that are equivalent in function, logic, or effect to one or more blocks, or portions thereof, of the illustrated drawings.

[0030] Although various arrow types and line types can be used in flow charts and / or block diagrams, it should be understood that they do not limit the scope of the corresponding embodiments. In fact, some arrows or other connectors can only be used to indicate the logical flow of the depicted embodiment. For example, an arrow can indicate a waiting or monitoring period of unspecified duration between the enumeration steps of the depicted embodiment. It will also be noted that each frame of the block diagram and / or flow chart and the combination of frames in the block diagram and / or flow chart can be realized by a system based on dedicated hardware that performs a specific function or operation, or a combination of dedicated hardware and code.

[0031] The description of an element in each figure may refer to an element of the previous figure. The same reference numerals refer to the same elements in all figures, including alternative embodiments of the same elements.

[0032] Figure 1 An embodiment of a wireless communication system 100 for data transmission using multiple transmission reception points is depicted. In one embodiment, the wireless communication system 100 includes a remote unit 102 and a network unit 104. Even if Figure 1 While a particular number of remote units 102 and network units 104 are depicted in FIG. 1 , one skilled in the art will recognize that any number of remote units 102 and network units 104 may be included in the wireless communication system 100 .

[0033] In one embodiment, the remote unit 102 may include a computing device such as a desktop computer, a laptop computer, a personal digital assistant (“PDA”), a tablet computer, a smart phone, a smart TV (e.g., a TV connected to the Internet), a set-top box, a game console, a security system (including a security camera), a car computer, a network device (e.g., a router, a switch, a modem), an Internet of Things device, etc. In some embodiments, the remote unit 102 includes a wearable device such as a smart watch, a fitness band, an optical head-mounted display, etc. In addition, the remote unit 102 may be referred to as a subscriber unit, a mobile device, a mobile station, a user, a terminal, a mobile terminal, a fixed terminal, a subscriber station, a UE, a user terminal, a device, or other terms used in the art. The remote unit 102 may communicate directly with one or more network units 104 via UL communication signals and / or the remote unit 102 may communicate directly with other remote units 102 via sidelink communications.

[0034] The network units 104 may be distributed over a geographic area. In some embodiments, the network units 104 may also be referred to as access points, access terminals, base stations, base stations, node Bs, eNBs, gNBs, home node Bs, RANs, relay nodes, devices, network devices, IAB nodes, host IAB nodes, or any other terminology used in the art. The 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 public switched telephone networks. These and other elements of the radio access and core networks are not illustrated, but are generally well known to those of ordinary skill in the art.

[0035] In one embodiment, the wireless communication system 100 complies with 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 some other open or proprietary communication protocols, for example, other protocols such as WiMAX. The present disclosure is not intended to be limited to any particular wireless communication system architecture or protocol implementation.

[0036] The network unit 104 can serve multiple remote units 102 within a service area, such as a cell or cell sector, via wireless communication links. The network unit 104 sends DL communication signals to serve the remote units 102 in the time, frequency, and / or spatial domains.

[0037] In some embodiments, the network unit 104 may send a downlink control information format to the user equipment in a downlink control channel, wherein: the downlink control information format includes a transmission configuration indication field; the transmission configuration indication field indicates two transmission configuration indication states; and each of the two transmission configuration indication states includes parameters for configuring a quasi-co-location relationship of associating at least one downlink reference signal resource with a demodulation reference signal of a downlink data channel. In some embodiments, the network unit 104 may send a downlink data channel from two transmission reception points, wherein each of the two transmission reception points sends each data layer of one or more data layers and a demodulation reference signal layer associated with each data layer. Therefore, the network unit 104 may be used for data transmission using multiple transmission reception points.

[0038] In various embodiments, the remote unit 102 may receive a downlink control information format from the network unit in a downlink control channel, wherein: the downlink control information format includes a transmission configuration indication field; the transmission configuration indication field indicates two transmission configuration indication states; and each of the two transmission configuration indication states includes parameters for configuring a quasi-co-location relationship that associates at least one downlink reference signal resource with a demodulation reference signal of a downlink data channel. In some embodiments, the remote unit 102 may receive a downlink data channel, wherein each data layer of one or more data layers and a demodulation reference signal associated with each data layer are associated with two transmission configuration indication states. Thus, the remote unit 102 may be configured for data transmission using multiple transmission reception points.

[0039] Figure 2 An embodiment of an apparatus 200 that can be used for data transmission using multiple transmission reception points is depicted. The apparatus 200 includes an embodiment of a remote unit 102. In addition, 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 touch screen. In some embodiments, the remote unit 102 may not include any input device 206 and / or display 208. In various embodiments, the remote unit 102 may include one or more of the processor 202, the memory 204, the transmitter 210, and the receiver 212, and may not include the input device 206 and / or the display 208.

[0040] In one embodiment, the processor 202 may include any known controller capable of executing computer-readable instructions and / or capable of performing logical operations. For example, the processor 202 may be a microcontroller, a microprocessor, a central processing unit (“CPU”), a graphics processing unit (“GPU”), an auxiliary processing unit, a field programmable gate array (“FPGA”), or a similar programmable controller. In some embodiments, the processor 202 executes instructions stored in the memory 204 to perform the methods and routines described herein. The processor 202 is communicatively coupled to the memory 204, the input device 206, the display 208, the transmitter 210, and the receiver 212.

[0041] 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 drive, flash memory, or any other suitable non-volatile computer storage device. In some embodiments, memory 204 includes both volatile computer storage media 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 algorithm operating on remote unit 102.

[0042] In one embodiment, input device 206 may include any known computer input device, including a touchpad, buttons, keyboard, stylus, microphone, etc. In some embodiments, input device 206 may be integrated with display 208, for example, as a touch screen or similar touch-sensitive display. In some embodiments, input device 206 includes a touch screen so that text can be entered using a virtual keyboard displayed on the touch screen and / or by handwriting on the touch screen. In some embodiments, input device 206 includes two or more different devices such as a keyboard and a touchpad.

[0043] 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, an LCD display, an LED display, an OLED display, a projector, or similar display devices capable of outputting images, texts, etc. to a user. As another non-limiting example, display 208 may include wearable displays such as smart watches, smart glasses, and head-up displays. In addition, display 208 may be components such as a smart phone, a personal digital assistant, a television, a desktop computer, a notebook (laptop) computer, a personal computer, a vehicle dashboard, etc.

[0044] In some embodiments, the display 208 includes one or more speakers for generating sounds. For example, the display 208 can generate an audible alarm or notification (e.g., a beep or ring). In some embodiments, the display 208 includes one or more tactile devices for generating vibration, motion, or other tactile feedback. In some embodiments, all or part of the display 208 can be integrated with the input device 206. For example, the input device 206 and the display 208 can form a touch screen or similar touch-sensitive display. In other embodiments, the display 208 can be located near the input device 206.

[0045] In various embodiments, the receiver 212 may: receive a downlink control information format from a network element in a downlink control channel, wherein: the downlink control information format includes a transmission configuration indication field; the transmission configuration indication field indicates two transmission configuration indication states; and each of the two transmission configuration indication states includes parameters for configuring a quasi-co-location relationship of associating at least one downlink reference signal resource with a demodulation reference signal of a downlink data channel; and receive a downlink data channel, wherein each of the one or more data layers and the demodulation reference signal associated with each data layer are associated with the two transmission configuration indication states. Although only one transmitter 210 and one receiver 212 are illustrated, the remote unit 102 may have any suitable number of transmitters 210 and receivers 212. The transmitter 210 and the receiver 212 may be any suitable type of transmitter and receiver. In one embodiment, the transmitter 210 and the receiver 212 may be part of a transceiver.

[0046] Figure 3 One embodiment of an apparatus 300 that may be used for data transmission using multiple transmission reception points is depicted. The apparatus 300 includes one embodiment of a network unit 104. In addition, 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 may be appreciated, the processor 302, the memory 304, the input device 306, the display 308, the transmitter 310, and the receiver 312 may be substantially similar to the processor 202, the memory 204, the input device 206, the display 208, the transmitter 210, and the receiver 212 of the remote unit 102, respectively.

[0047] In some embodiments, the transmitter 310 may: send a downlink control information format to the user equipment in a downlink control channel, wherein: the downlink control information format includes a transmission configuration indication field; the transmission configuration indication field indicates two transmission configuration indication states; and each of the two transmission configuration indication states contains parameters for configuring a quasi-co-location relationship of associating at least one downlink reference signal resource with a demodulation reference signal of a downlink data channel; and send a downlink data channel from two transmission reception points, wherein each of the two transmission reception points sends each data layer of one or more data layers and a demodulation reference signal associated with each data layer. Although only one transmitter 310 and one receiver 312 are shown, the network unit 104 may have any suitable number of transmitters 310 and receivers 312. The transmitter 310 and the receiver 312 may be any suitable type of transmitter and receiver. In one embodiment, the transmitter 310 and the receiver 312 may be part of a transceiver.

[0048] In some embodiments, a system with high-speed trains may have a single frequency network deployment.

[0049] Figure 4 4 is a schematic block diagram illustrating an embodiment of a system 400 that includes communications with a UE traveling at high speed. The system 400 (e.g., a cell) includes a first RRH 402 (e.g., a TRP) and a second RRH 404 (e.g., a TRP) that communicate with a UE 406 in a high-speed vehicle 408 (e.g., a train). The first RRH 402 and the second RRH 404 are deployed along a path (e.g., a railway line) along which the high-speed vehicle 408 travels. In some embodiments, the first RRH 402 and the second RRH 404 share the same cell ID. In various embodiments, the first RRH 402 and the second RRH 404 are connected to a gNB with an ideal backhaul and can jointly send DL data to the UE 406 in a PDSCH. Specifically, the first RRH 402 uses a first communication channel 410 (e.g., one or more communication channels) and the second RRH 404 uses a second communication channel 412 (e.g., one or more communication channels).

[0050] In some embodiments, each cell has two adjacent RRHs; while in other embodiments, each cell may have more or less than two adjacent RRHs. In some embodiments, the RRHs may use omnidirectional antennas. As can be appreciated, due to the high speed of the UE 406 in the high-speed vehicle 408, a large Doppler shift may be observed. For example, the second RRH 404 in front of the UE 406 may have a positive Doppler shift, while the first RRH 402 behind the UE 406 may have a negative Doppler shift. In various embodiments, the first communication channel 410 may be at F C +F D 1 The second communication channel 412 can operate at a frequency of F C +F D 2 Frequency operation. F C It can refer to the cell frequency, F D 1 can refer to the first Doppler shift, and F D 2 It may refer to the second Doppler shift. Due to the distance between the RRH and the path, and due to the location of UE 406, F D 1 (e.g., <0) and F D 2 (e.g., >0) may not necessarily have the same magnitude.

[0051] Figure 5is a schematic block diagram illustrating another embodiment of a system 500 including communication with a UE traveling at high speed. The system 500 (e.g., a cell) includes a first RRH 502 (e.g., a TRP), a second RRH 504 (e.g., a TRP), a third RRH 506 (e.g., a TRP), and a fourth RRH 508 (e.g., a TRP) communicating with a UE 510 in a high-speed vehicle 512 (e.g., a train). The first RRH 502, the second RRH 504, the third RRH 506, and the fourth RRH 508 are deployed along a path (e.g., a railway line) along which the high-speed vehicle 512 travels. The first RRH 502 uses a first communication channel 514 (e.g., one or more communication channels) to send a CSI-RS (e.g., CSI-RS1) in a first CSI-RS resource, the second RRH 504 uses a second communication channel 516 (e.g., one or more communication channels) to send a CSI-RS (e.g., CSI-RS2) in a second CSI-RS resource, the third RRH 506 uses a third communication channel 518 (e.g., one or more communication channels) to send a CSI-RS (e.g., CSI-RS3) in a third CSI-RS resource, and the fourth RRH 508 uses a fourth communication channel 520 (e.g., one or more communication channels) to send a CSI-RS (e.g., CSI-RS4) in a fourth CSI-RS resource. Different RRHs send different CSI-RSs in different CSI-RS resources. Different CSI-RS resources are configured for different RRHs. By separating CSI-RS signals from different RRHs in the time domain and / or frequency domain, UE 510 can distinguish different DL signals from different RRHs with different Doppler shifts and can estimate channels with corresponding Doppler shifts and / or Doppler spreads.

[0052] In some embodiments, the transmission of the PDSCH can be accomplished by paired adjacent RRHs. For example, for an RRH pair including a first RRH 502 and a second RRH 504, the first RRH 502 is configured to send a CSI-RS in a first CSI-RS resource and the second RRH 504 is configured to send a CSI-RS in a second CSI-RS resource. Based on the first and second CSI-RS resources, the UE 510 can estimate a channel with a Doppler shift from each RRH. Because each CSI-RS is subject to a single Doppler shift, no complex channel estimation algorithm is required. The PDSCH can be sent to the UE 510 from two adjacent RRHs using various transmission schemes, such as using the first transmission scheme described with respect to the first embodiment (e.g., SFNs from two RRHs in all data layers (e.g., transmission rank)) and the second transmission scheme described with respect to the second embodiment (e.g., SDM transmission from two RRHs).

[0053] In the first embodiment, all layers in the PDSCH are jointly transmitted from two RRHs in a pair of RRHs. This can prevent the strength of each layer from changing significantly when the UE 510 moves between the two RRHs (e.g., from the first RRH 502 (rear RRH) toward the second RRH 504 (front RRH)). In the first embodiment, the DMRS of each layer is associated with two CSI-RS resources for QCL assumption (e.g., the two CSI-RS resources are QCL). In certain configurations of the first embodiment: 1) each PDSCH layer is transmitted by two RRHs (e.g., a pair of adjacent RRHs); 2) PDSCH is transmitted by two RRHs sharing the same DMRS port (e.g., the same DMRS port number); 3) each DMRS port of each layer is associated with two CSI-RS resources (the DMRS ports are in one or two CDM groups, depending on the number of DMRS ports); and / or 4) the TCI field in DCI format 1_1 indicates two TCI states, each state is associated with a CSI-RS resource that is QCL type A or D (e.g., QCL type A may correspond to {Doppler shift, Doppler spread, average delay, and delay spread}, and there may be a QCL correspondence between Doppler shift, Doppler spread, average delay, and delay spread, while QCL type D may correspond to {spatial RX parameters}, and there may be a QCL correspondence for spatial RX parameters) and both TCI states are mapped to the same DMRS port set.

[0054] In the second embodiment, each layer in the PDSCH is transmitted from only one RRH. This enables the UE 510 to separate signals from different RRHs with different Doppler shifts in the spatial domain. In certain configurations of the second embodiment: 1) each PDSCH layer is transmitted by one of two adjacent RRHs, where all layers transmitted from the RRHs (e.g., TRPs) are in the same CDM group or groups; 2) the DMRS ports transmitted from the RRHs are associated with one CSI-RS resource or two CSI-RS resources with different QCL types; and / or 3) the TCI field in DCI format 1_1 indicates two TCI states, each state being associated with a CSI-RS resource that is either QCL type A or D.

[0055] In various embodiments, UE 510 is configured with multiple CSI reporting configurations. In such an embodiment, each CSI reporting configuration may have two CSI-RS resources for channel measurement sent from a pair of adjacent RRHs. Due to the high speed of UE 510, the CSI-RS resources in CSI-ReportConfig may be updated via MAC CE. Based on these two CSI-RS resources for channel measurement, UE 510 may calculate CSI feedback as follows: {RI, PMI1, PMI2, CQI} for the first embodiment; or {RI1, RI2, PMI1, PMI2, CQI}, or {RI, PMI1, PMI2, CQI} for the second embodiment. RI1 and PMI1 are used for the CSI-RS resources of the first configuration, and RI2 and PMI2 are used for the CSI-RS resources of the second configuration. If only one RI is included in the CSI feedback, it is applied to two CSI-RS resources (RI1=RI2=RI). RI1, RI2, PMI1, PMI2 and CQI are derived jointly from two CSI-RS resources. If the total rank from two RRHs (for the first embodiment, RI total =RI, and for the second embodiment, RI total =RI1+RI2 or 2*RI) is greater than 4, then two CQIs may be calculated, one for each codeword. For the first and second embodiments, if CSI feedback is calculated, UE 510 may select RI, PMI and CQI to maximize the overall PDSCH capacity.

[0056] In such an embodiment: A) one or more pairs of NZP CSI-RS resources can be configured in CSI-ReportConfig for channel measurement, where: {1) if they are arranged as an ordered pair (CSI-RS1, CSI-RS2), then a pair of NZP CSI-RS resources for channel measurement can be identified by the first CSI identification-RS resource ID, or can be identified by a separate index of an unordered pair (the ID of the CSI-RS resource pair can be used in the place of the CRI in the CSI feedback); 2) for zero-power CSI-IM resources configured for interference measurement, a predetermined behavior can be followed; 3) if resources for interference measurement based on NZP CSI-RS are configured and if NZP CSI-RS pairs are configured, then the pair of NZP-CSI-RS can be used for interference measurement performed by UE 510 under the assumption that they are all used for transmission as interference (when calculating CSI feedback, UE 510 may assume that a pair of NZP-CSI-RS resources for interference measurement are QCLed with a pair of NZP-CSI-RS resources for channel measurement); 4) for each measurement, the association between the resource setting for channel measurement and the resource setting for interference measurement (CSI-IM, NZP CSI-RS) may follow a predetermined behavior}; B) a pair of CSI-RS resources for channel measurement and interference measurement may be introduced in CSI-ResourceConfig; C) CSI-ReportConfig may be quickly updated through MAC CE (which may be important for updating the CSI configuration for channel measurement); C) the joint PMI1 & PMI2 may be calculated based on a pair of CSI-RS resources for channel measurement; and / or D) in CSI feedback: {1) both PMI1 and PMI2 may be included in the CSI feedback instead of PMI or i1 (for example, i1 may refer to a subset of indicators from a larger set of indicators, the first index among the two indexes); and / or 2) if PMI1 and PMI2 are used, CQI reflects the channel quality}.

[0057] In some embodiments, if the gNB receives a CSI report from the UE 510, the gNB may schedule a PDSCH transmission scheme according to the first embodiment or the second embodiment based on the CSI feedback.

[0058] Figure 6 is a schematic flow chart illustrating one embodiment of a method 600 for data transmission using multiple transmission reception points. In some embodiments, the method 600 is performed by a device such as the network unit 104. In some embodiments, the method 600 may be performed by a processor executing program code, such as a microcontroller, a microprocessor, a CPU, a GPU, an auxiliary processing unit, an FPGA, etc.

[0059] The method 600 may include sending 602 a downlink control information format to a user equipment in a downlink control channel, wherein: the downlink control information format includes a transmission configuration indication field; the transmission configuration indication field indicates two transmission configuration indication states; and each of the two transmission configuration indication states includes parameters for configuring a quasi-co-site relationship that associates at least one downlink reference signal resource (e.g., CSI-RS or SSB) with a demodulation reference signal of a downlink data channel. In some embodiments, the method 600 includes sending 604 a downlink data channel from two transmission reception points, wherein each of the two transmission reception points sends each data layer of one or more data layers and a demodulation reference signal associated with each data layer.

[0060] In some embodiments, each demodulation reference signal port in the downlink data channel is associated with two transmission configuration indication states. In some embodiments, the demodulation reference signal associated with each data layer is associated with two different channel state information reference signal resources.

[0061] Figure 7 is a schematic flow chart illustrating one embodiment of a method 700 for data transmission using multiple transmission reception points. In some embodiments, the method 700 is performed by a device such as the remote unit 102. In some embodiments, the method 700 may be performed by a processor executing program code, such as a microcontroller, a microprocessor, a CPU, a GPU, an auxiliary processing unit, an FPGA, etc.

[0062] The method 700 may include receiving 702 a downlink control information format from a network element in a downlink control channel, wherein: the downlink control information format includes a transmission configuration indication field; the transmission configuration indication field indicates two transmission configuration indication states; and each of the two transmission configuration indication states includes parameters for configuring a quasi-co-location relationship of associating at least one downlink reference signal resource (e.g., CSI-RS or SSB) with a demodulation reference signal of a downlink data channel. In some embodiments, the method 700 includes receiving 704 a downlink data channel, wherein each of the one or more data layers and the demodulation reference signal associated with each data layer are associated with the two transmission configuration indication states.

[0063] In some embodiments, each demodulation reference signal port in the downlink data channel is associated with two transmission configuration indication states. In some embodiments, the demodulation reference signal associated with each data layer is associated with two different downlink reference signal resources.

[0064] In one embodiment, a method includes: sending a downlink control information format to a user equipment in a downlink control channel, wherein: the downlink control information format includes a transmission configuration indication field; the transmission configuration indication field indicates two transmission configuration indication states; and each of the two transmission configuration indication states contains parameters for configuring a quasi-co-site relationship that associates at least one downlink reference signal resource with a demodulation reference signal of a downlink data channel; and sending a downlink data channel from two transmission receiving points, wherein each of the two transmission receiving points sends each data layer of one or more data layers and a demodulation reference signal associated with each data layer.

[0065] In certain embodiments, each demodulation reference signal port in the downlink data channel is associated with two transmission configuration indication states.

[0066] In some embodiments, the demodulation reference signal associated with each data layer is associated with two different downlink reference signal resources.

[0067] In one embodiment, a device includes: a transmitter, which: sends a downlink control information format to a user equipment in a downlink control channel, wherein: the downlink control information format includes a transmission configuration indication field; the transmission configuration indication field indicates two transmission configuration indication states; and each of the two transmission configuration indication states contains parameters for configuring a quasi-co-site relationship that associates at least one downlink reference signal resource with a demodulation reference signal of a downlink data channel; and sends a downlink data channel from two transmission receiving points, wherein each of the two transmission receiving points sends each data layer of one or more data layers and a demodulation reference signal associated with each data layer.

[0068] In certain embodiments, each demodulation reference signal port in the downlink data channel is associated with two transmission configuration indication states.

[0069] In some embodiments, the demodulation reference signal associated with each data layer is associated with two different downlink reference signal resources.

[0070] In one embodiment, a method includes: receiving a downlink control information format from a network unit in a downlink control channel, wherein: the downlink control information format includes a transmission configuration indication field; the transmission configuration indication field indicates two transmission configuration indication states; and each of the two transmission configuration indication states includes parameters for configuring a quasi-co-site relationship that associates at least one downlink reference signal resource with a demodulation reference signal of a downlink data channel; and receiving a downlink data channel, wherein each of one or more data layers and a demodulation reference signal associated with each data layer are associated with the two transmission configuration indication states.

[0071] In certain embodiments, each demodulation reference signal port in the downlink data channel is associated with two transmission configuration indication states.

[0072] In some embodiments, the demodulation reference signal associated with each data layer is associated with two different downlink reference signal resources.

[0073] In one embodiment, a device includes: a receiver, which receives a downlink control information format from a network unit in a downlink control channel, wherein: the downlink control information format includes a transmission configuration indication field; the transmission configuration indication field indicates two transmission configuration indication states; and each of the two transmission configuration indication states contains parameters for configuring a quasi-co-site relationship that associates at least one downlink reference signal resource with a demodulation reference signal of a downlink data channel; and receives a downlink data channel, wherein each of one or more data layers and the demodulation reference signal associated with each data layer are associated with the two transmission configuration indication states.

[0074] In certain embodiments, each demodulation reference signal port in the downlink data channel is associated with two transmission configuration indication states.

[0075] In some embodiments, the demodulation reference signal associated with each data layer is associated with two different downlink reference signal resources.

[0076] Embodiments may be practiced in other specific forms. The described embodiments should be considered in all respects to be illustrative only and not restrictive. Therefore, the scope of the present invention is indicated by the appended claims rather than the preceding description. All changes within the meaning and equivalent range of the claims are included within their scope.

Claims

1. A method performed by a network element, comprising: The downlink control information format is sent to the user equipment in the downlink control channel, where: The downlink control information format includes a transmission configuration indication field; The transmission configuration indication field indicates two transmission configuration indication states; and Each of the two transmission configuration indication states includes parameters for configuring a quasi co-location relationship of associating at least one downlink reference signal resource with a demodulation reference signal of a downlink data channel; and The downlink data channel is transmitted from two transmission reception points, wherein each of the two transmission reception points transmits each data layer of one or more data layers and a demodulation reference signal associated with each data layer.

2. The method according to claim 1, wherein: Each demodulation reference signal port in the downlink data channel is associated with the two transmission configuration indication states.

3. The method according to claim 1, wherein: The demodulation reference signal associated with each data layer is associated with two different downlink reference signal resources.

4. A network unit, comprising: A transmitter, the transmitter: The downlink control information format is sent to the user equipment in the downlink control channel, where: The downlink control information format includes a transmission configuration indication field; The transmission configuration indication field indicates two transmission configuration indication states; and Each of the two transmission configuration indication states includes parameters for configuring a quasi co-location relationship of associating at least one downlink reference signal resource with a demodulation reference signal of a downlink data channel; and The downlink data channel is transmitted from two transmission reception points, wherein each of the two transmission reception points transmits each data layer of one or more data layers and a demodulation reference signal associated with each data layer.

5. The network unit according to claim 4, wherein: Each demodulation reference signal port in the downlink data channel is associated with the two transmission configuration indication states.

6. The network unit according to claim 4, wherein: The demodulation reference signal associated with each data layer is associated with two different downlink reference signal resources.

7. A method performed by a remote unit, comprising: A downlink control information format is received from a network element in a downlink control channel, wherein: The downlink control information format includes a transmission configuration indication field; The transmission configuration indication field indicates two transmission configuration indication states; and Each of the two transmission configuration indication states includes parameters for configuring a quasi co-location relationship of associating at least one downlink reference signal resource with a demodulation reference signal of a downlink data channel; and The downlink data channel is received, wherein each data layer of the one or more data layers and a demodulation reference signal associated with each data layer are associated with the two transmission configuration indication states.

8. The method according to claim 7, wherein: Each demodulation reference signal port in the downlink data channel is associated with the two transmission configuration indication states.

9. The method according to claim 7, wherein: The demodulation reference signal associated with each data layer is associated with two different downlink reference signal resources.

10. A remote unit comprising: A receiver, the receiver: A downlink control information format is received from a network element in a downlink control channel, wherein: The downlink control information format includes a transmission configuration indication field; The transmission configuration indication field indicates two transmission configuration indication states; and Each of the two transmission configuration indication states includes parameters for configuring a quasi co-location relationship of associating at least one downlink reference signal resource with a demodulation reference signal of a downlink data channel; and The downlink data channel is received, wherein each data layer of the one or more data layers and a demodulation reference signal associated with each data layer are associated with the two transmission configuration indication states.

11. The remote unit of claim 10, wherein: Each demodulation reference signal port in the downlink data channel is associated with the two transmission configuration indication states.

12. The remote unit of claim 10, wherein: The demodulation reference signal associated with each data layer is associated with two different downlink reference signal resources.

Images