WO2024002004A1 - 一种参考信号的指示方法及装置 - Google Patents

一种参考信号的指示方法及装置 Download PDF

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Publication number
WO2024002004A1
WO2024002004A1 PCT/CN2023/102387 CN2023102387W WO2024002004A1 WO 2024002004 A1 WO2024002004 A1 WO 2024002004A1 CN 2023102387 W CN2023102387 W CN 2023102387W WO 2024002004 A1 WO2024002004 A1 WO 2024002004A1
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WO
WIPO (PCT)
Prior art keywords
information
reference signal
terminal device
trp
network devices
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/CN2023/102387
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English (en)
French (fr)
Inventor
王瀚庆
王潇涵
金黄平
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Huawei Technologies Co Ltd
Original Assignee
Huawei Technologies Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Huawei Technologies Co Ltd filed Critical Huawei Technologies Co Ltd
Priority to EP23830181.6A priority Critical patent/EP4535704A4/en
Publication of WO2024002004A1 publication Critical patent/WO2024002004A1/zh
Priority to US19/002,908 priority patent/US20250125996A1/en
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00—Baseband systems
    • H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
    • H04L25/0202—Channel estimation
    • H04L25/0224—Channel estimation using sounding signals
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00—Baseband systems
    • H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
    • H04L25/0202—Channel estimation
    • H04L25/0204—Channel estimation of multiple channels
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/0001—Arrangements for dividing the transmission path
    • H04L5/0026—Division using four or more dimensions, e.g. beam steering or quasi-co-location [QCL]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0032—Distributed allocation, i.e. involving a plurality of allocating devices, each making partial allocation
    • H04L5/0035—Resource allocation in a cooperative multipoint environment
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0048—Allocation of pilot signals, i.e. of signals known to the receiver
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0048—Allocation of pilot signals, i.e. of signals known to the receiver
    • H04L5/0051—Allocation of pilot signals, i.e. of signals known to the receiver of dedicated pilots, i.e. pilots destined for a single user or terminal
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/0091—Signalling for the administration of the divided path, e.g. signalling of configuration information

Definitions

  • the present application relates to the field of communication technology, and in particular, to a method and device for indicating a reference signal.
  • the existing radio access network (RAN) of mobile communication systems has a variety of networking forms. Common ones include centralized RAN (centralized RAN, CRAN) networking and distributed networking (such as Internet Protocol RAN ( Internet Protocol RAN, IPRAN)).
  • CRAN networking there is an ideal backhaul between different RAN devices, that is, the transmission delay between different RAN devices is very small, allowing real-time information exchange between RAN devices.
  • IPRAN networking the backhaul between different RAN devices is not ideal, that is, the transmission delay between different RAN devices is large, making it impossible for real-time information exchange between RAN devices.
  • a typical scenario in mobile communications is that the terminal device moves to an area covered by the respective cells of two RAN devices. At this time, the terminal device can establish wireless connections with the two RAN devices at the same time to improve data transmission efficiency.
  • CJT coherent joint transmission
  • IPRAN distributed networks such as IPRAN
  • the coherent joint transmission technology applied to CRAN networks cannot be applied due to non-ideal backhaul between RAN devices. How to enable coherent joint transmission to be applied in non-ideal backhaul networks is an urgent problem that needs to be solved to improve user experience in non-ideal backhaul networks.
  • This application provides a reference signal indication method and device, enabling coherent joint transmission in non-ideal backhaul networks.
  • this application provides a method for indicating a reference signal, including: a terminal device receiving multiple first information from multiple network devices, wherein one of the first information comes from one of the network devices, and the first information is At least one reference signal indicating the network device is used to estimate the joint equivalent channel; the terminal device receives a plurality of second information from the plurality of network devices, wherein one of the second information comes from one of the network devices, and the third Two information is used to indicate the port of the at least one reference signal; the terminal device receives a plurality of coherent joint transmission data from the plurality of network devices, wherein one of the coherent joint transmission data comes from one of the network devices, and the coherent joint transmission data The data includes at least one data stream and the at least one reference signal corresponding to the at least one data stream, and one data stream corresponds to one reference signal; and the terminal device determines at least one of the reference signals based on the at least one reference signal of the plurality of network devices. Joint equivalent channels, wherein a joint equivalent channel is determined based on
  • the method provided by the embodiments of the present application enables coherent joint transmission in non-ideal backhaul networks, effectively improves the service quality of users in mobile networks in areas covered by multiple cells, and improves user experience.
  • the method further includes: the terminal device demodulates the at least one data stream according to the at least one joint equivalent channel, wherein one data stream is demodulated through a joint equivalent channel.
  • the reference signal is a demodulation reference signal DMRS.
  • the second information includes a port number or a port index of each reference signal in the at least one reference signal.
  • the first information is carried in radio resource control RRC signaling.
  • the second information is carried in downlink control information DCI signaling.
  • the present application provides a method for indicating a reference signal, including: a network device determines a resource for coherent joint transmission of a terminal device; the network device determines a port of at least one reference signal allocated for the coherent joint transmission; the network device Send first information to the terminal device, the first information is used to indicate that the at least one reference signal is used to estimate a joint equivalent channel; the network device sends second information to the terminal device, the second information is used to indicate the a port for at least one reference signal; and the network device sends coherent joint transmission data to the terminal device, where the coherent joint transmission data includes at least one data stream and the at least one reference signal corresponding to the at least one data stream, wherein one of the data The stream corresponds to one of this reference signals.
  • the method provided by the embodiments of the present application enables coherent joint transmission in non-ideal backhaul networks, effectively improves the service quality of users in mobile networks in areas covered by multiple cells, and improves user experience.
  • the second information includes a port number or a port index of each reference signal in the at least one reference signal.
  • the method further includes: the network device determines each of the at least one reference signal included in the second information according to the first rule.
  • the port number or port index sort order
  • the reference signal is a demodulation reference signal DMRS.
  • the first information is carried in radio resource control RRC signaling.
  • the second information is carried in downlink control information DCI signaling.
  • a terminal device for performing the method in the first aspect or any possible implementation of the first aspect.
  • the terminal device may include a terminal device for performing the first aspect or the method in any possible implementation of the first aspect. Any possible implementation of the method unit.
  • a fourth aspect provides a network device for performing the second aspect or the method in any possible implementation of the second aspect.
  • the network device may include a network device for performing the second aspect or the method in any possible implementation of the second aspect. Any possible implementation of the method unit.
  • a terminal device in a fifth aspect, includes: a processor, a transceiver and a memory.
  • the memory is used to store computer execution instructions.
  • the processor executes the computer execution instructions stored in the memory, so that the terminal device executes the first aspect or any of the possible implementations of the first aspect. method in.
  • a network device in a sixth aspect, includes: a processor, a transceiver and a memory. Wherein, the memory is used to store computer execution instructions. When the network device is running, the processor executes the computer execution instructions stored in the memory, so that the network device executes the second aspect or any of the possible implementations of the second aspect. method in.
  • a communication device including a processor.
  • the processor is coupled to a memory and may be used to execute instructions in the memory to implement the method in the above first aspect or any possible implementation manner of the first aspect.
  • the communication device further includes a memory.
  • the communication device further includes a communication interface, and the processor is coupled to the communication interface.
  • the communication device is a terminal device, and the communication interface may be a transceiver or an input/output interface.
  • the communication device is a chip configured in a terminal device.
  • the communication interface may be an input/output interface.
  • the transceiver may be a transceiver circuit.
  • the input/output interface may be an input/output circuit.
  • a communication device including a processor.
  • the processor is coupled to the memory and may be used to execute instructions in the memory to implement the method in the above second aspect or any possible implementation manner of the second aspect.
  • the communication device further includes a memory.
  • the communication device further includes a communication interface, and the processor is coupled to the communication interface.
  • the communication device is a network device
  • the communication interface may be a transceiver or an input/output interface.
  • the communication device is a chip configured in a network device.
  • the communication interface may be an input/output interface.
  • the transceiver may be a transceiver circuit.
  • the input/output interface may be an input/output circuit.
  • a processor including: an input circuit, an output circuit and a processing circuit.
  • the processing circuit is configured to receive a signal through the input circuit and transmit a signal through the output circuit, so that the processor executes the method in the first aspect or any possible implementation of the first aspect.
  • a processor including: an input circuit, an output circuit and a processing circuit.
  • the processing circuit is configured to receive a signal through the input circuit and transmit a signal through the output circuit, so that the processor executes the method in the second aspect or any possible implementation of the second aspect.
  • a processing device including a processor and a memory.
  • the processor is used to read instructions stored in the memory, and can receive signals through a receiver and transmit signals through a transmitter to execute the method in the first aspect or any possible implementation of the first aspect.
  • processors there are one or more processors and one or more memories.
  • the memory may be integrated with the processor, or the memory may be provided separately from the processor.
  • a processing device including a processor and a memory.
  • the processor is used to read instructions stored in the memory, and can receive signals through a receiver and transmit signals through a transmitter to execute the method in the second aspect or any possible implementation of the second aspect.
  • processors there are one or more processors and one or more memories.
  • the memory may be integrated with the processor, or the memory may be provided separately from the processor.
  • the above-mentioned processor can be a chip, the input circuit can be an input pin, the output circuit can be an output pin, and the processing circuit can be a transistor, a gate circuit, a flip-flop, and various logic circuits.
  • the input signal received by the input circuit may be received and input by, for example, but not limited to, the receiver, and the signal output by the output circuit may be, for example, but not limited to, output to and transmitted by the transmitter, and the input circuit and the output A circuit may be the same circuit that functions as an input circuit and an output circuit at different times.
  • the embodiments of this application do not limit the specific implementation methods of the processor and various circuits.
  • the memory can be non-transitory memory, such as read-only memory (ROM), which can be integrated on the same chip as the processor, or can be set in different On the chip, the embodiment of the present application does not limit the type of memory and the arrangement of the memory and the processor.
  • ROM read-only memory
  • sending instruction information may be a process of outputting instruction information from the processor
  • receiving capability information may be a process of the processor receiving input capability information.
  • the data output by the processor can be output to the transmitter, and the input data received by the processor can be from the receiver.
  • the transmitter and receiver can be collectively called a transceiver.
  • the processing device in the above eleventh or twelfth aspect may be a chip, and the processor may be implemented by hardware.
  • the implementation can also be implemented through software.
  • the processor can be a logic circuit, an integrated circuit, etc.; when implemented through software, the processor can be a general processor that reads the data stored in the memory.
  • the memory can be integrated in the processor, or can be located outside the processor and exist independently.
  • a computer-readable storage medium stores a program.
  • the program causes the computer to execute the first aspect or any possible implementation of the first aspect, or the second aspect. Or the method in any possible implementation of the second aspect.
  • a computer program product includes: computer program code.
  • the computer program code When the computer program code is run by the communication unit, processing unit, transceiver, or processor of the communication device, the computer program code causes the communication device to execute The method in the first aspect or any possible implementation of the first aspect, or the second aspect or any possible implementation of the second aspect.
  • Figure 1 is a schematic diagram of a communication system provided by an embodiment of the present application.
  • Figure 2 is a schematic structural diagram of a network device and a terminal device provided by an embodiment of the present application
  • Figure 3 is a schematic structural diagram of a protocol stack of a communication device provided by an embodiment of the present application.
  • Figure 4 is a flow chart of a method for indicating a reference signal provided by an embodiment of the present application
  • Figure 5 is a schematic diagram of reference signal port allocation provided by an embodiment of the present application.
  • Figure 6 is a schematic diagram of another reference signal port allocation provided by an embodiment of the present application.
  • FIG. 7 is a schematic diagram of yet another reference signal port allocation provided by an embodiment of the present application.
  • Figure 8 is a schematic structural diagram of a network device provided by an embodiment of the present application.
  • Figure 9 is a schematic structural diagram of a terminal device provided by an embodiment of the present application.
  • Figure 10 is a schematic structural diagram of a chip provided by an embodiment of the present application.
  • "for indicating” may include direct indicating and indirect indicating.
  • indication information When describing a certain "instruction information" used to indicate A, it may include that the indication information directly indicates A or indirectly indicates A, but it does not mean that the indication information must contain A.
  • the information indicated by the indication information is called information to be indicated.
  • the information to be indicated can be directly indicated, such as the information to be indicated itself or the information to be indicated. Index indicating information, etc.
  • the information to be indicated may also be indirectly indicated by indicating other information, where there is an association relationship between the other information and the information to be indicated. It is also possible to indicate only a part of the information to be indicated, while other parts of the information to be indicated are known or agreed in advance.
  • the indication of specific information can also be achieved by means of a pre-agreed (for example, protocol stipulated) arrangement order of each piece of information, thereby reducing the indication overhead to a certain extent.
  • the common parts of each piece of information can also be identified and indicated in a unified manner to reduce the instruction overhead caused by indicating the same information individually.
  • the specific indication method may also be various existing indication methods, such as, but not limited to, the above-mentioned indication methods and various combinations thereof.
  • the specific details of various indication methods can be referred to the existing technology, and will not be described again here.
  • the required indication method can be selected according to specific needs.
  • the embodiments of the present application do not limit the selected indication method. In this way, the indication methods involved in the embodiments of the present application should be understood to cover the indication methods to be indicated. square Various methods of obtaining information to be indicated.
  • the information to be instructed can be sent together as a whole, or can be divided into multiple sub-information and sent separately, and the sending period and/or sending timing of these sub-information can be the same or different.
  • the specific sending method is not limited in this application.
  • the sending period and/or sending timing of these sub-information may be predefined, for example, according to a protocol, or may be configured by the transmitting device by sending configuration information to the receiving device.
  • the configuration information may include, for example but not limited to, one or at least two of radio resource control (RRC) signaling, medium access control (medium access control, MAC) layer signaling and physical layer signaling. combination of species.
  • RRC radio resource control
  • MAC medium access control
  • the MAC layer signaling includes, for example, MAC control element (CE)
  • the physical layer signaling includes, for example, downlink control information (DCI).
  • the first, second and various numerical numbers are only used to distinguish them for convenience of description and are not used to limit the scope of the embodiments of the present application. For example, distinguish between different reference signals or indication information, etc.
  • "predefinition” or “preconfiguration” can be achieved by pre-saving corresponding codes, tables or other methods that can be used to indicate relevant information in the device (for example, including terminal equipment and network equipment).
  • This application is for its The specific implementation method is not limited.
  • "saving” may refer to saving in one or more memories.
  • the one or more memories may be a separate device, or may be integrated in an encoder or decoder, a processor, or a communication device.
  • the one or more memories may also be partially provided separately and partially integrated in the decoder, processor, or communication device.
  • the type of memory can be any form of storage medium, and this application is not limited thereto.
  • the "protocol” involved in the embodiments of this application may refer to a standard protocol in the communication field, which may include, for example, LTE protocol, NR protocol, and related protocols applied in future communication systems. This application does not limit this.
  • “at least one” refers to one or more, and “multiple” refers to two or more.
  • “And/or” describes the association of associated objects, indicating that there can be three relationships, for example, A and/or B, which can mean: A exists alone, A and B exist simultaneously, and B exists alone, where A, B can be singular or plural.
  • the character "/” generally indicates that the related objects are in an "or” relationship.
  • “At least one of the following” or similar expressions thereof refers to any combination of these items, including any combination of a single item (items) or a plurality of items (items).
  • At least one of a, b and c can mean: a, or, b, or, c, or, a and b, or, a and c, or, b and c, or, a , b and c.
  • a, b and c can be single or multiple respectively.
  • the technical solution provided by this application can be applied to various communication systems.
  • the technical solutions provided by this application can be applied to fifth generation (5G) mobile communication systems, future evolution systems or multiple communication convergence systems, etc., or can It is applied to other existing communication systems, such as wideband code division multiple access (WCDMA) systems, Long Term Evolution (LTE) systems, etc.
  • the application scenarios of the technical solution provided by this application can include a variety of applications, such as machine to machine (M2M), macro and micro communications, enhanced mobile broadband (eMBB), ultra-high reliability and ultra-low Scenarios such as ultra reliable & low latency communication (uRLLC) and massive IoT communication (massive machine type communication (mMTC)).
  • M2M machine to machine
  • eMBB enhanced mobile broadband
  • uRLLC ultra-high reliability and ultra-low Scenarios
  • uRLLC ultra reliable & low latency communication
  • mMTC massive IoT communication
  • These scenarios may include but are not limited to: communication scenarios between terminals
  • the communication system 100 includes at least two network devices, such as multiple transmission and reception points (TRPs) shown in Figure 1: TRP 1 and TRP 2; the communication system 100 may also include At least one terminal device, multiple user equipment (UE) as shown in Figure 1: UE 1 to UE 5.
  • TRPs transmission and reception points
  • UE user equipment
  • the terminal equipments UE 1 to UE 5 can be mobile or fixed.
  • a network device can communicate with one or more terminal devices through wireless links. Each network device can provide communications coverage for a specific geographic area and can communicate with end devices located within that coverage area.
  • the network device can send configuration/scheduling information to the terminal device, and the terminal device can receive downlink data sent by the network device based on the configuration information; for another example, the terminal device can also send uplink data to the network device.
  • UE 1 and UE 2 are in the coverage area of TRP 1
  • UE 3 and UE 4 are in the coverage area of TRP 1 and TRP 2
  • UE 5 is in the coverage area of TRP 2.
  • UE 3 and UE 4 can establish wireless communication with TRP 1 or TRP 2.
  • TRP 1 and TRP 2 can jointly provide communication services to UE 3 and UE 4 through the CJT.
  • FIG. 1 exemplarily shows two network devices and multiple terminal devices, as well as communication links between the respective communication devices. In an actual system, more network devices and terminal devices may be included, and this application does not limit this.
  • Each of the above communication devices can be configured with multiple antennas.
  • the plurality of antennas may include at least one transmit antenna for transmitting signals and at least one receive antenna for receiving signals.
  • each communication device additionally includes a transmitter chain and a receiver chain.
  • Those of ordinary skill in the art can understand that they may include multiple components related to signal transmission and reception (such as processors, modulators, multiplexers). , demodulator, demultiplexer or antenna, etc.). Therefore, network equipment and terminal equipment can communicate through multi-antenna technology.
  • the wireless communication system 100 may also include other network entities such as a network controller and a mobility management entity, to which the embodiments of the present application are not limited.
  • network entities such as a network controller and a mobility management entity, to which the embodiments of the present application are not limited.
  • Figure 1 is only a schematic diagram and does not constitute a limitation on the applicable scenarios of the technical solution provided by this application.
  • the network device may be a wireless communication base station or a base station controller, etc.
  • the base station may include various types of base stations, such as micro base stations (also called small stations), macro base stations, relay stations, access points, etc., which are not specifically limited in the embodiments of this application.
  • the base station may be a base station (node B) in WCDMA, an evolutionary node B (eNB or e-NodeB) in LTE, the Internet of things (IoT) or a narrowband eNB in narrow band-internet of things (NB-IoT), access point (AP), wireless relay node, wireless backhaul node in wireless fidelity (WiFi) system, transmission point, TP) or TRP or other base stations in 5G mobile communication networks or future evolved public land mobile networks (public land mobile network, PLMN), the embodiments of this application do not impose any restrictions on this.
  • node B base station
  • eNB or e-NodeB the Internet of things
  • NB-IoT narrowband eNB in narrow band-internet of things
  • AP access point
  • WiFi wireless fidelity
  • TP transmission point
  • TRP future evolved public land mobile networks
  • the network equipment mentioned in this application usually includes a baseband unit (BBU), a remote radio unit (RRU) or an active antenna unit (AAU), an antenna, and Feeder used to connect RRU/AAU and antenna.
  • BBU baseband unit
  • RRU remote radio unit
  • AAU active antenna unit
  • Feeder used to connect RRU/AAU and antenna usually includes a baseband unit (BBU), a remote radio unit (RRU) or an active antenna unit (AAU), an antenna, and Feeder used to connect RRU/AAU and antenna.
  • BBU baseband unit
  • RRU remote radio unit
  • AAU active antenna unit
  • Feeder used to connect RRU/AAU and antenna Feeder used to connect RRU/AAU and antenna.
  • BBU baseband unit
  • RRU remote radio unit
  • AAU active antenna unit
  • Feeder used to connect RRU/AAU and antenna usually includes a baseband unit (BBU), a remote radio unit (RRU) or an active antenna unit (AAU), an antenna, and Feeder used
  • all BBUs can also be centralized and placed in the Central Office (CO). Through this centralized approach, the number of base station computer rooms and supporting equipment can be greatly reduced, especially The energy consumption of air conditioning can reduce a large amount of carbon emissions.
  • the scattered BBUs after the scattered BBUs are centralized into a BBU baseband pool, they can be managed and scheduled uniformly, making resource allocation more flexible. In this mode, all physical base stations evolve into virtual base stations. All virtual base stations share user data transmission and reception, channel quality and other information in the BBU baseband pool, and cooperate with each other to realize joint scheduling.
  • base stations may include centralized units (CU) and distributed units (DU).
  • the base station may also include an active antenna unit (AAU).
  • CU implements some functions of the base station, and DU implements some functions of the base station.
  • CU is responsible for processing non-real-time protocols and services, implementing wireless resource control, and packet data convergence protocol (PDCP) layer functions.
  • DU is responsible for processing physical layer protocols and real-time services, implementing wireless link control (radio link control, RLC), media access control and physical (physical, PHY) layer functions.
  • RLC wireless link control
  • AAU implements some physical layer processing functions, radio frequency processing and active antenna related functions.
  • the network device may be a device including one or more of a CU node, a DU node, and an AAU node.
  • the CU can be divided into network equipment in the RAN, or the CU can be divided into network equipment in the core network (core network, CN), which is not limited here.
  • the network equipment provides services for the cell, and the terminal equipment communicates with the cell through the transmission resources (for example, frequency domain resources, or spectrum resources) allocated by the network equipment.
  • the cell may belong to a macro base station (for example, macro eNB or macro gNB, etc.) , or it can belong to the base station corresponding to a small cell.
  • the small cell here can include: metro cell, micro cell, pico cell, femto cell, etc. , these small cells have the characteristics of small coverage and low transmission power, and are suitable for providing high-rate data transmission services.
  • the terminal equipment may also be called UE, access terminal, user unit, user station, mobile station, mobile station, remote station, remote terminal, mobile device, user terminal, terminal, wireless communication equipment, user Agent or user device.
  • the terminal device may be a device that provides voice/data connectivity to the user, such as a handheld device, a vehicle-mounted device, etc. with wireless connectivity capabilities.
  • some examples of terminals can be: mobile phones, tablets, computers with wireless transceiver functions (such as laptops, handheld computers, etc.), mobile internet devices (MID), virtual reality (virtual reality, VR) equipment, augmented reality (AR) equipment, wireless terminals in industrial control, wireless terminals in self-driving, wireless terminals in telemedicine Terminals, wireless terminals in smart grids, wireless terminals in transportation safety, wireless terminals in smart cities, wireless terminals in smart homes, cellular phones, cordless Telephones, session initiation protocol (SIP) telephones, wireless local loop (WLL) stations, personal digital assistants (PDAs), tools Handheld devices with wireless communication capabilities, computing devices or other processing devices connected to wireless modems, vehicle-mounted devices, wearable devices, terminal devices in 5G networks or terminal devices in future evolved PLMNs, etc.
  • MID mobile internet devices
  • VR
  • wearable devices can also be called wearable smart devices. It is a general term for applying wearable technology to intelligently design daily wear and develop wearable devices, such as glasses, gloves, watches, clothing and shoes, etc.
  • a wearable device is a portable device that is worn directly on the body or integrated into the user's clothing or accessories. Wearable devices are not just hardware devices, but also achieve powerful functions through software support, data interaction, and cloud interaction. Broadly defined wearable smart devices include full-featured, large-sized devices that can achieve complete or partial functions without relying on smartphones, such as smart watches or smart glasses, and those that only focus on a certain type of application function and need to cooperate with other devices such as smartphones. Use, such as various types of smart bracelets, smart jewelry, etc. for physical sign monitoring.
  • the terminal device may also be a terminal device in the IoT system.
  • IoT is an important part of the future development of information technology. Its main technical feature is to connect objects to the network through communication technology, thereby realizing an intelligent network of human-computer interconnection and object interconnection. IoT technology can achieve massive connections, deep coverage, and terminal power saving through narrowband (NB) technology, for example.
  • NB narrowband
  • terminal equipment can also include sensors such as smart printers, train detectors, and gas stations. Its main functions include collecting data (some terminal equipment), receiving control information and downlink data from network equipment, and sending electromagnetic waves to transmit uplink data to network equipment. .
  • Terminals are used to provide voice and/or data connectivity services to users.
  • the terminal may have different names, such as user equipment (UE), access terminal, terminal unit, terminal station, mobile station, mobile station, remote station, remote terminal, mobile device, wireless communication device, terminal agent or terminal device, etc.
  • the terminal 20 can be various handheld devices, vehicle-mounted devices, wearable devices, and computers with communication functions, which are not limited in this embodiment of the present application.
  • the handheld device may be a smartphone.
  • the vehicle-mounted device may be a vehicle-mounted navigation system.
  • Wearable devices can be smart bracelets or VR devices.
  • the computer can be a PDA computer, a tablet computer, and a laptop computer.
  • Figure 2 is a schematic diagram of the hardware structure of a network device and a terminal device provided by an embodiment of the present application.
  • the terminal device includes at least one processor 101 and at least one transceiver 103.
  • the terminal device may also include an output device 104, an input device 105 and at least one memory 102.
  • the processor 101, the memory 102 and the transceiver 103 are connected by a bus.
  • the processor 101 can be a general central processing unit (CPU), a microprocessor, an application-specific integrated circuit (ASIC), or one or more processors used to control the execution of the program of the present application. integrated circuit.
  • the processor 101 may also include multiple CPUs, and the processor 101 may be a single-CPU processor or a multi-CPU processor.
  • a processor here may refer to one or more devices, circuits, or processing cores for processing data (eg, computer program instructions).
  • the memory 102 may be a read-only memory (ROM) or other type of static storage device that can store static information and instructions, a random access memory (random access memory (RAM)) or other type that can store information and instructions.
  • a dynamic storage device can also be an electrically erasable programmable read-only memory (EEPROM), a compact disc read-only memory (CD-ROM), or other optical disk storage or optical disk storage. (including compressed optical discs, laser discs, optical discs, digital versatile discs, Blu-ray discs, etc.), disk storage media or other magnetic storage devices, or can be used to carry or store desired program code in the form of instructions or data structures and can be used by a computer Any other media to be accessed, the embodiments of this application do not impose any restrictions on this.
  • the memory 102 may exist independently and be connected to the processor 101 through a bus.
  • the memory 102 may also be integrated with the processor 101.
  • the memory 102 is used to store application program code for executing the solution of the present application, and the processor 101 controls the execution.
  • the processor 101 is used to execute the computer program code stored in the memory 102 to implement The method provided by the embodiment of this application.
  • the transceiver 103 can use any transceiver-like device for communicating with other devices or communication networks, such as Ethernet, radio access network (RAN), wireless local area networks (WLAN), etc. .
  • Transceiver 103 includes a transmitter Tx and a receiver Rx.
  • the output device 104 communicates with the processor 101 and can display information in a variety of ways.
  • the output device 104 may be a liquid crystal display (LCD), a light emitting diode (LED) display device, a cathode ray tube (CRT) display device, or a projector. wait.
  • Input device 105 communicates with processor 101 and may receive user input in a variety of ways.
  • the input device 105 may be a mouse, a keyboard, a touch screen device, a sensing device, or the like.
  • the network device includes at least one processor 201, at least one memory 202, at least one transceiver 203, and at least one network interface 204.
  • the processor 201, the memory 202, the transceiver 203 and the network interface 204 are connected through a bus.
  • the network interface 204 is used to connect to the core network device through a link (such as the S1 interface), or to connect to the network interfaces of other network devices through a wired or wireless link (such as the X2 interface) (not shown in the figure), The embodiments of the present application do not specifically limit this.
  • the relevant description of the processor 201, the memory 202 and the transceiver 203 may refer to the description of the processor 101, the memory 102 and the transceiver 103 in the terminal, which will not be described again here.
  • control plane and data plane protocol stack structure of the communication device including network equipment and terminal equipment involved in this application is shown in Figure 3.
  • Both network equipment and terminal equipment have the following modules:
  • Radio resource control (RRC) signaling interaction module a module used by network equipment and terminal equipment to send and receive RRC signaling. For example, the network equipment sends RRC signaling to the terminal equipment, and the terminal equipment receives RRC from the network equipment. signaling.
  • RRC Radio resource control
  • Media access control layer (media access control, MAC) signaling interaction module a module used by network equipment and terminal equipment to send and receive media access control (medium access control, MAC)-control element (control element, CE) signaling , such as the network device sends MAC-CE signaling to the terminal device, and the terminal device receives the MAC-CE signaling from the network device.
  • media access control medium access control
  • CE control element
  • Physical layer (PHY) signaling and data interaction module a module used by network equipment and terminal equipment to send and receive uplink/downlink control signaling and uplink/downlink data.
  • the network device sends a physical downlink control channel (PDCCH), such as downlink control information (DCI) in the PDCCH, to the terminal device, and the network device sends a physical downlink shared channel (physical downlink shared) to the terminal device. channel, PDSCH), such as downlink data in PDSCH.
  • the terminal device sends a physical uplink control channel (PUCCH) to the network device, such as the uplink control information (UCI) in the PUCCH, and the terminal device sends a physical uplink shared channel (physical uplink shared channel) to the network device.
  • PUSCH physical uplink shared channel
  • network equipment and terminal equipment can also include other communication modules, such as wireless link control (radio link control, RLC) module, packet data convergence protocol (packet data convergence protocol) , PDCP) module, or service data adaptation protocol (service data adaptation protocol, SDAP) module, etc., the embodiments of this application do not specifically limit this.
  • RLC radio link control
  • PDCP packet data convergence protocol
  • SDAP service data adaptation protocol
  • Coherent joint transmission Multiple network devices jointly send the same data to the terminal device on the same resources (such as time domain resources, frequency domain resources, time-frequency domain resources, etc.), so that the signals sent from multiple network devices are Coherent superposition at the terminal device improves the signal-to-dry ratio or signal-to-noise ratio of the signal received by the terminal device and improves data transmission efficiency.
  • resources such as time domain resources, frequency domain resources, time-frequency domain resources, etc.
  • Reference signal used for channel measurement or channel estimation, etc.
  • the reference signal may include, for example, a demodulation reference signal (demodulation reference signal, DMRS), channel state information reference signal (channel state information reference signal, CSI-RS), synchronization signal block (synchronization signal block, SSB), etc.
  • DMRS demodulation reference signal
  • CSI-RS channel state information reference signal
  • SSB synchronization signal block
  • Reference signal port a logical port used to indicate the reference signal.
  • the port of the reference signal is determined by the frequency domain resources, time domain resources and multiplexing code occupied by the reference signal. Reference signals belonging to the same port can be considered to have experienced the same channel. Reference signals belonging to different ports are orthogonal to each other.
  • Code division multiplexing (CDM) group used to distinguish reference signals occupying the same time-frequency resources.
  • CDM groups different reference signals are distinguished by loading different orthogonal codes.
  • the ports of the multiple reference signals are different from each other; for multiple reference signals belonging to the same CDM group, the ports of the multiple reference signals may be the same or different.
  • coherent joint transmission is a data transmission method that effectively improves the quality of service (QoS) and improves user experience in mobile communications for users in multi-cell coverage areas.
  • QoS quality of service
  • multiple network devices need to exchange information in real time, such as resource allocation information for transmission data and corresponding reference signals.
  • the CRAN networking method it can be considered as ideal backhaul transmission with low latency between network devices, and it is easy to realize coordinated transmission between network devices.
  • the non-ideal backhaul transmission delay between network devices may be 20ms or even longer, making it impossible to realize real-time information interaction between network devices.
  • a key technology in coherent joint transmission is to achieve joint equivalent channel estimation, that is, the terminal device needs to jointly estimate the channels of multiple network devices participating in coherent joint transmission to demodulate data streams from multiple network devices.
  • coherent joint transmission of CRAN networking usually multiple network devices allocate the same reference signal port to each data stream in coherent joint transmission, that is, each network device sends the same reference signal to a downlink data stream. .
  • the terminal device does not distinguish between reference signals from different network devices, treats the channels of multiple network devices as a whole for joint channel estimation, and uses the estimated channel characteristics to demodulate the data streams from multiple network devices.
  • distributed networking and related technologies there is no coordination between different network devices. The terminal device estimates the channel of each network device separately, and coherent joint transmission cannot be achieved.
  • embodiments of the present application provide a reference signal indication method to enable coherent joint transmission in non-ideal backhaul networks, effectively improving the QoS of users in the coverage area of multiple cells in the mobile network, and improving user experience.
  • Figure 4 is a schematic flow chart of a method embodiment of the present application, showing detailed communication steps or operations of the method, but these steps or operations are only examples, and other embodiments of the present application can also be performed. operations or variations of the various operations in Figure 4.
  • the various steps in FIG. 4 may be performed in a different order than that presented in FIG. 4 , and not all operations in FIG. 4 may be performed.
  • FIG. 4 shows a schematic flowchart of a method for indicating a reference signal provided by an embodiment of the present application.
  • the method 400 is applied to the interaction between multiple (at least two) network devices and one terminal device.
  • the network device is a TRP
  • the terminal device is a UE
  • the reference signal is DMRS for description.
  • the network device can also be other network-side devices
  • the terminal device can also be other devices
  • the reference signal can also be other types of signals (such as CSI-RS signal, SSB signal, etc.), this application does not specifically limit this.
  • the process shown in Figure 4 includes the following steps:
  • TRP 1 determines the coherent joint transmission resources of the UE.
  • TRP 1 is any TRP in the TRP set that provides coherent joint transmission for the UE.
  • the coherent joint transmission of the UE includes the transmission of one or more downlink data streams.
  • TRP n determines the resources for coherent joint transmission of the UE.
  • n is an integer greater than 1 and less than or equal to N
  • N is the number of TRPs in the TRP set that provides coherent joint transmission for the UE
  • N is an integer greater than or equal to 2. It should be noted that only TRP 1 and TRP n are used as examples in Figure 4. In actual applications, all TRPs in the TRP set perform this step respectively.
  • the coherent joint transmission resources of the UE determined by TRP 1 and the coherent joint transmission resources (such as time-frequency resources, frequency domain resources, code domain resources, time-frequency domain resources, etc.) of the UE determined by TRP n are related. linked.
  • the coherent joint transmission resources of the UE include resources occupied by one or more downlink data streams and resources occupied by the corresponding DMRS.
  • each TRP in the TRP set allocates the same resources to each downlink data stream in the coherent joint transmission of the UE. For example, assuming that the TRP set includes TRP 1 and TRP 2, and the coherent joint transmission of the UE includes data stream 1, data stream 2 and data stream 3, then TRP 1 and TRP 2 both transmit the data stream 1 and data of the UE. Stream 2 and data stream 3, and the resources allocated by TRP 1 to the three downstream data streams are the same as the resources allocated by TRP 2 to the three downstream data streams respectively.
  • TRP1 initially allocates resource 1 and resource 2 for data flow 1
  • TRP 2 initially allocates resources 2 and 2 for data flow 1.
  • Resource 3. In order to ensure that TRP 1 and TRP 2 allocate the same resources to each downlink data flow of the UE, in a possible implementation, TRP 1 indicates its initial resource allocation to the UE, and TRP 2 indicates its initial resource allocation to the UE. UE, the UE updates the resource allocation status and reports it to TRP 1 and TRP 2, so that the downlink data flow resources allocated by TRP 1 and TRP 2 to the UE are the same.
  • the UE can report resource 1, resource 2 and resource 3 to TRP 1 and TRP 2 respectively, so that both TRP 1 and TRP 2 use resource 1, resource 2 and resource 3 to transmit data flow 1 for the UE. , or all use some common resources among resource 1, resource 2 and resource 3 to transmit data stream 1 for the UE.
  • TRP 1 indicates its initial resource allocation status to the UE
  • TRP 2 indicates its initial resource allocation status to the UE
  • the UE resource allocation status is reported to TRP 1, or TRP 2, or TRP 1 and the control node of TRP 2, so that TRP 1 indicates TRP 2, or TRP2 indicates TRP1, or the control node indicates that TRP 1 and TRP 2 have the same resources for the downlink data flow allocated to the UE.
  • TRP 1 and TRP 2 also use the same resources to transmit data flow 2 to the UE, and use the same resources to transmit data flow 3 to the UE. It should be understood that the above is only an example, and this application does not specifically limit how each TRP in the TRP set determines the resources for coherent joint transmission of the UE.
  • TRP 1 determines one or more DMRS ports allocated for coherent joint transmission of the UE.
  • TRP n determines one or more DMRS ports allocated for coherent joint transmission of the UE.
  • TRP 1 determines corresponding DMRS ports for each of the one or more downlink data streams in the coherent joint transmission of the UE.
  • a DMRS port There is a one-to-one correspondence between a DMRS port and a downstream data stream.
  • the coherent joint transmission of the UE includes data stream 1, data stream 2 and data stream 3, then TRP1 determines the corresponding DMRS port for each data stream, for example, data stream 1 corresponds to DMRS port 1, and data stream 2 corresponds to DMRS port. 2.
  • Data stream 3 corresponds to DMRS port 3.
  • the first DMRS corresponding to DMRS port 1, the second DMRS corresponding to DMRS port 2, and the third DMRS corresponding to DMRS port 3 occupy the same or different time-frequency resources.
  • the two DMRSs that occupy the same time-frequency resources DMRS are respectively composed of different orthogonal code sequences.
  • different downlink data flows correspond to different DMRS and different DMRS ports.
  • TRP 1 and TRP n are used as examples. In actual applications, the All TRPs perform this step individually. Since each TRP allocates DMRS ports on its own without coordination, depending on the DMRS ports of each TRP, different TRPs may allocate the same DMRS port for the same downlink data stream in the coherent joint transmission of the UE, or they may allocate Different DMRS ports.
  • DMRS ports of different TRPs in the TRP set belong to different CDM groups. That is, all DMRS ports of TRP i belong to CDM group i, and all DMRS ports of TRP j belong to CDM group j, where i is not equal to j. In this case, since the DMRS of each TRP belongs to different CDM groups, the one or more DMRS ports allocated by each TRP for the coherent joint transmission of the UE are different.
  • each TRP in the TRP set allocates different DMRS ports to the downlink data stream.
  • Figure 5 shows a schematic diagram of two TRPs respectively allocating DMRS ports for the downlink data flow of the UE.
  • TRP 1 allocates DMRS port 1 to this downlink data flow
  • TRP 2 allocates DMRS port 2 to this downlink data flow
  • DMRS port 1 and DMRS port 2 belong to different CDM groups respectively.
  • each TRP in the TRP set allocates different DMRS ports to different downlink data streams, and the DMRS ports allocated by different TRPs do not have the same situation.
  • Figure 6 shows a schematic diagram in which two TRPs respectively allocate DMRS ports to the three downlink data streams of the UE.
  • TRP1 allocates DMRS port 1 to data flow 1, allocates DMRS port 2 to data flow 2, and allocates DMRS port 4 to data flow 3;
  • TRP2 allocates DMRS port 5 to data flow 1, and allocates DMRS port 2 to data flow 2.
  • DMRS port 1, DMRS port 2 and DMRS port 3 belong to one CDM group, and DMRS port 5, DMRS port 7 and DMRS port 8 belong to another CDM group.
  • the DMRS ports of different TRPs in the TRP set may belong to the same CDM group. That is, all DMRS ports of TRP i belong to CDM group i, and all DMRS ports of TRP j belong to CDM group j, where i is equal to j.
  • the DMRS ports allocated by each TRP for the downstream data flow may be the same or different.
  • each TRP allocates different DMRS ports to the downstream data flow, which is similar to that shown in Figure 5. The difference is that DMRS port 1 and DMRS port 2 belong to the same CDM group.
  • each TRP allocates the same DMRS port to the downstream data flow.
  • Figure 7 shows a schematic diagram in which two TRPs respectively allocate the same DMRS port to the downlink data flow of the UE.
  • the DMRS port allocated by TRP 1 for this downstream data flow and the DMRS port allocated by TRP 2 for this downstream data flow are both DMRS port 1.
  • TRP 1 sends first information to the UE.
  • the first information is used to indicate that one or more DMRS of TRP 1 is used to estimate the joint equivalent channel. Accordingly, the UE receives the first information from TRP 1.
  • TRP n sends the first information to the UE. Accordingly, the UE receives the first information from TRP n.
  • TRP 1 determines one or more DMRS ports corresponding to one or more downlink data streams of the UE in the aforementioned S402. In this step, TRP 1 notifies the UE that the one or more DMRS ports are used to estimate the joint equivalent channel.
  • the UE receives the downlink data stream and the DMRS corresponding to the downlink data stream from multiple TRPs. The UE performs joint equivalent channel estimation based on the DMRS received from multiple TRPs, and demodulates the received downlink data stream based on the estimated equivalent channel characteristics.
  • each TRP in the TRP set that provides coherent joint transmission for the UE needs to inform the UE that its DMRS is used to estimate the joint equivalent channel.
  • TRP 1 and TRP n are used as examples in Figure 4. In actual applications, all TRPs in the TRP set perform this step respectively.
  • the first information is carried in RRC signaling.
  • the first information may also be carried in MAC-CE signaling or DCI signaling.
  • the first information is carried in standard existing RRC or MAC-CE or DCI signaling, such as In the field of the signaling, it can also be carried in new RRC or MAC-CE or DCI signaling.
  • TRP 1 sends second information to the UE, and the second information is used to indicate one or more DMRS ports of TRP 1. Accordingly, the UE receives the second information from TRP 1.
  • TRP n sends the second information to the UE.
  • the UE receives the second information from TRP n.
  • TRP 1 determines one or more DMRS ports corresponding to one or more data streams in the UE's coherent joint transmission in the aforementioned S402, and notifies the UE in the aforementioned S403 that the one or more DMRS ports are used for UE estimation joint transmission. equivalent channel.
  • TRP 1 sends the determined indication information of the one or more DMRS ports to the UE as second information, so that the UE obtains the indication information of the DMRS port corresponding to each downlink data flow.
  • TRP 1 and TRP n are used as examples in Figure 4. In actual applications, all TRPs in the TRP set perform this step respectively.
  • the second information includes the port number, port index, or other port indication information of each DMRS port in the one or more DMRS ports.
  • the second information is carried in physical layer control signaling such as DCI signaling.
  • the second information may also be carried in MAC-CE signaling or RRC signaling.
  • the second information is carried in standard existing RRC or MAC-CE or DCI signaling, such as being included in a field of the existing signaling, or it can also be carried in new RRC or MAC-CE or DCI signaling. In DCI signaling.
  • TRP 1 may send DCI 1 to the UE, wherein the second information in DCI 1 includes the indication information of DMRS port 1; TRP 2 may send DCI 2 to the UE, wherein the second information in DCI 2
  • the message contains DMRS port 2 indication information.
  • the indication information of a DMRS port includes the port number or port index of the DMRS port.
  • TRP 1 may send DCI 1 to the UE, where the second information in DCI 1 includes indication information of DMRS port 1, indication information of DMRS port 2, and indication information of DMRS port 4;
  • TRP 2 may send DCI 2 to the UE, where the second information in DCI 2 includes indication information of DMRS port 5, indication information of DMRS port 7, and indication information of DMRS port 8.
  • TRP 1 includes the indication information of its multiple DMRS ports in the second information in a certain order according to the first rule.
  • TRP n also includes the indication information of its multiple DMRS ports in the second information in sequence according to the first rule. Therefore, the UE can learn which DMRS ports are used for joint equivalent channel estimation for a certain downlink data flow from the order of DMRS port indication information received by each TRP.
  • the first rule is that the port numbers or port indexes of the multiple DMRS ports correspond one-to-one with the transport layer sequence numbers corresponding to the multiple data flows in ascending or descending order.
  • each data stream will be mapped to a transport layer, and multiple data streams will be mapped to multiple transport layers respectively.
  • data flow 1 corresponds to transport layer 1 in both TRP 1 and TRP 2
  • data flow 2 corresponds to transport layer 2 in both TRP 1 and TRP 2
  • data flow 3 corresponds to TRP 1 and TRP 2.
  • TRP 1 sends the second information in the order of the indication information of DMRS port 1, the indication information of DMRS port 2 and the indication information of DMRS port 3, and TRP 2 sends the second information in accordance with the indication information of DMRS port 5, DMRS port
  • the second information is sent in sequence with the indication information of DMRS port 7 and the indication information of DMRS port 8.
  • the UE can determine based on the order of DMRS port indication information sent by TRP 1 and TRP 2 respectively that DMRS port 1 and DMRS port 5 are joint equivalent channels used to estimate the downlink data flow of transport layer 1, and DMRS port 2 and DMRS port 7 are used to estimate the downlink data flow of transport layer 1.
  • DMRS port 4 and DMRS port 8 are used for estimating the joint equivalent channel of the downlink data flow of the transport layer 3.
  • the first rule may be preconfigured or predefined by the protocol.
  • TRP 1 may send DCI 1 to the UE, where the first information in DCI 1 contains the indication information of DMRS port 1; TRP 2 may send DCI 2 to the UE, where the first information in DCI 2 The message also contains DMRS port 1 indication.
  • TRP 1 sends coherent joint transmission data to the UE. Accordingly, the UE receives coherent joint transmission data from TRP 1.
  • TRP n sends coherent joint transmission data to the UE. Accordingly, the UE receives coherent joint transmission data from TRP n.
  • the coherent joint transmission data includes one or more downlink data streams and one or more DMRS corresponding to the one or more downlink data streams.
  • a downlink data stream and the DMRS corresponding to the downlink data stream are transmitted in the same time slot (or subframe).
  • a downlink data stream can be transmitted in multiple time slots (or subframes), and the DMRS corresponding to the downlink data stream is also transmitted in the multiple time slots (or subframes) together with the data of the downlink data stream.
  • the UE will estimate the channel by detecting the DMRS in the time slot (or subframe), and use the downlink data in the time slot (or subframe) according to the characteristics of the channel.
  • the data stream is demodulated.
  • coherent joint transmission includes multiple downlink data streams
  • the multiple downlink data streams multiplex the same time slot (or subframe).
  • TRP 1 and TRP n are used as examples in Figure 4. In actual applications, all TRPs in the TRP set perform this step respectively.
  • the UE determines the joint equivalent channel.
  • the UE obtains the indication information of one or more DMRS ports allocated by each TRP for the UE's coherent joint transmission and the DMRS used to estimate the joint equivalent channel through the second information respectively sent by multiple TRPs.
  • the UE receives coherent joint transmission data sent by each of multiple TRPs, where the coherent joint transmission data includes one or more downlink data streams and corresponding DMRS.
  • the UE estimates the channel of one or more downlink data streams according to the indication information of one or more DMRS ports, and obtains the joint equivalent channel of each data stream.
  • TRP 1 uses the precoding matrix P 1 to precode the DMRS sent on the DMRS port 1 and sends the precoded DMRS
  • TRP 2 uses the precoding matrix P 2 precodes the DMRS signal sent on DMRS port 2, and sends the precoded DMRS.
  • a TRP precodes and sends a DMRS. It can be understood that the TRP changes the DMRS through the precoding matrix and sends it to the terminal device in a specific spatial direction. In the previous steps, the UE learns that DMRS port 1 and DMRS port 2 are used to estimate the joint equivalent channel.
  • the UE determines the joint equivalent channel of the data flow by detecting DMRS sent on DMRS port 1 and DMRS port 2. For example, assuming that the channel between TRP 1 and the UE is represented by H 1 and the channel between TRP 2 and the UE is represented by H 2 , then the joint equivalent channel determined by the UE through DMRS is [H 1 H 2 ][P 1 P 2 ] T , where A T is represented as the transpose of matrix A.
  • TRP 1 uses precoding matrix P 1,1 to precode the DMRS sent on DMRS port 1, and uses precoding matrix P 1,2 to precode the DMRS sent on DMRS port 1.
  • the DMRS sent on DMRS port 4 is precoded, and the precoding matrix P 1,3 is used to precode the DMRS sent on DMRS port 4, and the three precoded DMRS are sent;
  • TRP 2 uses the precoding matrix P 2,1 DMRS sent on DMRS port 5 is precoded using precoding matrix P 2,2 for DMRS sent on DMRS port 7 and precoding matrix P 2,3 used for DMRS port 8 DMRS is precoded, and three precoded DMRS are sent.
  • the UE learned that DMRS port 1 and DMRS port 5 are joint equivalent channels used to estimate data flow 1, DMRS port 2 and DMRS port 7 are joint equivalent channels used to estimate data flow 2, and DMRS port 4 and DMRS port 8 is the joint equivalent channel used to estimate data stream 3.
  • the UE determines respective joint equivalent channels for different downlink data streams. For example, by detecting DMRS sent on DMRS port 1 and DMRS port 5, the UE determines that the joint equivalent channel corresponding to downlink data stream 1 is [H 1 H 2 ][P 1,1 P 2,1 ] T .
  • the UE determines that the joint equivalent channel corresponding to downlink data stream 2 is [H 1 H 2 ][P 1,2 P 2,2 ] T by detecting the DMRS sent on DMRS port 2 and DMRS port 7.
  • the UE detects the DMRS sent on DMRS port 4 and DMRS port 8 to determine the downlink
  • the joint equivalent channel corresponding to data stream 3 is [H 1 H 2 ][P 1,3 P 2,3 ] T .
  • the terminal device may determine which DMRS ports from different TRPs are used for joint equivalent channel estimation for a certain downlink data flow according to the first rule.
  • TRP 1 uses the precoding matrix P 1 to precode the DMRS sent on the DMRS port 1 and sends the precoded DMRS
  • TRP 2 uses the precoding matrix P 2 precodes the DMRS signal sent on DMRS port 1, and sends the precoded DMRS.
  • the UE determines the joint equivalent channel by detecting the DMRS sent on DMRS port 1.
  • the channel between TRP 1 and UE is represented by H 1 and the channel between TRP 2 and UE is represented by H 2 , then the joint equivalent channel determined by UE through DMRS is [H 1 H 2 ][P 1 P 2 ] T .
  • each TRP uses different DMRS ports
  • the UE can separately estimate the equivalent channels of each TRP and further combine them to obtain a joint equivalent channel.
  • the UE since each TRP uses the same DMRS port, the UE cannot distinguish the channels of different TRPs. The UE directly obtains the joint equivalent channel by measuring on one DMRS port.
  • the method also includes S407.
  • the UE demodulates the downlink data stream according to the joint equivalent channel.
  • the UE determines the joint equivalent channel corresponding to each downlink data stream in one or more downlink data streams.
  • the UE demodulates each downlink data stream according to the channel parameters of each joint equivalent channel, thereby obtaining the data of each downlink data stream.
  • how the UE demodulates a downlink data stream based on the joint equivalent channel of the data stream can refer to various methods currently available in the industry, which will not be described in detail in this application.
  • multiple network devices that provide coherent joint transmission for terminal devices respectively indicate information used to estimate the reference signal of the joint equivalent channel, so that the terminal device estimates the joint transmission of multiple network devices based on the corresponding indication information.
  • Equivalent channels enable coherent joint transmission in non-ideal backhaul networks, effectively improving the QoS of users in the coverage area of multiple cells in the mobile network and improving user experience.
  • each network element such as network equipment and terminals
  • each network element includes hardware structures or software modules corresponding to each function, or a combination of both.
  • the present application can be implemented in the form of hardware or a combination of hardware and computer software. Whether a function is performed by hardware or computer software driving the hardware depends on the specific application and design constraints of the technical solution. Skilled artisans may implement the described functionality using different methods for each specific application, but such implementations should not be considered beyond the scope of this application.
  • Embodiments of the present application can divide network devices and terminals into functional modules according to the above method examples.
  • each functional module can be divided corresponding to each function, or two or more functions can be integrated into one processing module.
  • the above integrated modules can be implemented in the form of hardware or software function modules. It should be noted that the division of modules in the embodiment of the present application is schematic and is only a logical function division. In actual implementation, there may be other division methods. The following is an example of dividing each functional module corresponding to each function:
  • Figure 8 is a schematic structural diagram of a network device provided by an embodiment of the present application.
  • the network device includes a communication unit 801 and a processing unit 802.
  • the communication unit 801 is used to support the network device to perform S403 and S405 in Figure 4, and/or to support other processes of the technical solution described herein.
  • the processing unit 802 is used to support the network device to perform steps S401 and S402 in Figure 4, and/or to support other processes of the technical solutions described herein.
  • the communication unit 801 in Figure 8 can be implemented by the transceiver 203 in Figure 2
  • the processing unit 702 in Figure 8 can be implemented by the processor 201 in Figure 2
  • the embodiment of this application is suitable for This is not specifically limited.
  • Figure 9 is a schematic structural diagram of a terminal device provided by an embodiment of the present application.
  • the terminal device includes a communication unit 901 and a processing unit 902.
  • the communication unit 901 is used to support the terminal device to perform steps S403 and S405 in Figure 4, and/or to support other processes of the technical solutions described herein.
  • the processing unit 902 is used to support the terminal device to perform steps S404 and S406 in Figure 4, and/or to support other processes of the technical solutions described herein.
  • the communication unit 901 in Figure 9 can be implemented by the transceiver 103 in Figure 2
  • the processing unit 902 in Figure 9 can be implemented by the processor 101 in Figure 2
  • the embodiments of this application do not specifically limit this.
  • Embodiments of the present application also provide a computer-readable storage medium.
  • Computer instructions are stored in the computer-readable storage medium; when the computer-readable storage medium is run on a communication device, the communication device is caused to execute as shown in Figure 3 and the method shown in Figure 6.
  • the computer instructions may be stored in or transmitted from one computer-readable storage medium to another computer-readable storage medium, for example, the computer instructions may be transferred from a website, computer, server, or data center Transmission to another website, computer, server or data center through wired (such as coaxial cable, optical fiber, digital subscriber line (DSL)) or wireless (such as infrared, wireless, microwave, etc.) means.
  • wired such as coaxial cable, optical fiber, digital subscriber line (DSL)
  • wireless such as infrared, wireless, microwave, etc.
  • the computer-readable storage medium can be any available medium that can be accessed by a computer or include one or more data storage devices such as servers and data centers that can be integrated with the medium.
  • the available media may be magnetic media (such as floppy disks, hard disks, magnetic tapes), optical media, or semiconductor media (such as solid state disks (SSD)), etc.
  • Embodiments of the present application also provide a computer program product containing computer instructions, which, when run on a communication device, enables the communication device to execute the method shown in FIG. 4 .
  • Figure 10 is a schematic structural diagram of a chip provided by an embodiment of the present application.
  • the chip shown in Figure 10 can be a general-purpose processor or a special-purpose processor.
  • the chip includes processor 1001. Among them, the processor 1001 is used to support the communication device to execute the technical solution shown in Figure 4.
  • the chip also includes a transceiver pin 1002.
  • the transceiver pin 1002 is used to accept the control of the processor 1001 and is used to support the communication device in executing the technical solution shown in Figure 4.
  • the chip shown in Figure 10 may also include: a storage medium 1003.
  • the chip shown in Figure 10 can be implemented using the following circuits or devices: one or more field programmable gate arrays (FPGA), programmable logic devices (PLD) , controller, state machine, gate logic, discrete hardware components, any other suitable circuit, or any combination of circuits capable of performing the various functions described throughout this application.
  • FPGA field programmable gate arrays
  • PLD programmable logic devices
  • controller state machine
  • gate logic discrete hardware components
  • any other suitable circuit any combination of circuits capable of performing the various functions described throughout this application.
  • the terminals, network equipment, computer storage media, computer program products, and chips provided by the above embodiments of the present application are all used to execute the methods provided above. Therefore, the beneficial effects they can achieve can be obtained by referring to the methods provided above. The beneficial effects will not be repeated here.

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Abstract

本申请实施例提供一种参考信号的指示方法及装置，用于使能非理想回程网络中的相干联合传输。该方法包含以下步骤：终端设备接收来自多个网络设备的多个第一信息，第一信息用于指示网络设备的至少一个参考信号用于估计联合等效信道；终端设备接收来自多个网络设备的多个第二信息，第二信息用于指示至少一个参考信号的端口；终端设备接收来自多个网络设备的多个相干联合传输数据，一个相干联合传输数据包括至少一个数据流以及对应的至少一个参考信号；以及终端设备根据多个网络设备的至少一个参考信号确定至少一个所述联合等效信道。

Description

一种参考信号的指示方法及装置
本申请要求于2020年06月30日提交中国知识产权局、申请号为202210769930.8、申请名称为“一种参考信号的指示方法及装置”的中国专利申请的优先权，其全部内容通过引用结合在本申请中。
技术领域
本申请涉及通信技术领域，尤其涉及一种参考信号的指示方法及装置。
背景技术
现有的移动通信系统的无线接入网(radio access network,RAN)有多种组网形式，常见的包括集中式RAN(centralized RAN,CRAN)组网和分布式组网(如互联网协议RAN(Internet Protocol RAN,IPRAN))。在CRAN组网中，不同的RAN设备之间具有理想的回程(backhaul)，即不同的RAN设备之间的传输时延很小，使得RAN设备之间可以进行实时信息交互。而在IPRAN组网中，不同的RAN设备之间的回程是非理想的，即不同的RAN设备之间的传输时延较大，使得RAN设备之间无法进行实时信息的交互。
移动通信中的一个典型场景是终端设备移动到两个RAN设备各自的小区共覆盖的区域，此时终端设备可以同时和两个RAN设备建立无线连接以提高数据传输效率。借助于RAN设备间的实时信息交互能力，在CRAN组网中，相干联合传输(coherent joint transmission,CJT)是适用于该场景通信的一种高效数据传输方式。然而，在IPRAN等分布式组网中，由于RAN设备间的非理想回程，应用于CRAN组网下的相干联合传输技术无法适用。如何使能相干联合传输在非理想回程网络中得以应用，是改善非理想回程网络中用户体验亟需解决的问题。
发明内容
本申请提供一种参考信号的指示方法及装置，使能在非理想回程网络中的相干联合传输。
以下从多个方面介绍本申请，容易理解的是，该以下多个方面的实现方式可互相参考。
第一方面，本申请提供一种参考信号的指示方法，包括：终端设备接收来自多个网络设备的多个第一信息，其中，一个该第一信息来自一个该网络设备，该第一信息用于指示该网络设备的至少一个参考信号用于估计联合等效信道；该终端设备接收来自该多个网络设备的多个第二信息，其中，一个该第二信息来自一个该网络设备，该第二信息用于指示该该至少一个参考信号的端口；该终端设备接收来自该多个网络设备的多个相干联合传输数据，其中，一个该相干联合传输数据来自一个该网络设备，该相干联合传输数据包括至少一个数据流以及该至少一个数据流对应的该至少一个参考信号，一个该数据流对应一个该参考信号；以及该终端设备根据该多个网络设备的该至少一个参考信号确定至少一个该联合等效信道，其中，一个该联合等效信道是根据该多个网络设备的一个该参考信号确定的。
可见，本申请实施例提供的方法使能在非理想回程网络中的相干联合传输，有效提升移动网络中处于多小区共覆盖区域的用户的服务质量，改善用户体验。
在一种可选的方式中，该方法还包括：终端设备根据该至少一个联合等效信道解调该至少一个数据流，其中，一个数据流是通过一个联合等效信道解调的。
在一种可选的方式中，该参考信号是解调参考信号DMRS。
在一种可选的方式中，该第二信息包括该至少一个参考信号中各个参考信号的端口号或端口索引。
在一种可选的方式中，该第一信息承载在无线资源控制RRC信令中。
在一种可选的方式中，该第二信息承载在下行控制信息DCI信令中。
第二方面，本申请提供一种参考信号的指示方法，包括：网络设备确定终端设备的相干联合传输的资源；该网络设备确定为该相干联合传输分配的至少一个参考信号的端口；该网络设备向该终端设备发送第一信息，该第一信息用于指示该至少一个参考信号用于估计联合等效信道；该网络设备向该终端设备发送第二信息，该第二信息用于指示所述至少一个参考信号的端口；以及该网络设备向该终端设备发送相干联合传输数据，该相干联合传输数据包括至少一个数据流以及该至少一个数据流对应的该至少一个参考信号，其中，一个该数据流对应一个该参考信号。
可见，本申请实施例提供的方法使能在非理想回程网络中的相干联合传输，有效提升移动网络中处于多小区共覆盖区域的用户的服务质量，改善用户体验。
在一种可选的方式中，该第二信息包括该至少一个参考信号中各个参考信号的端口号或端口索引。
在一种可选的方式中，在该网络设备向该终端设备发送第二信息之前，该方法还包括：该网络设备根据第一规则确定第二信息包括的该至少一个参考信号中各个参考信号的端口号或端口索引的排列顺序。
在一种可选的方式中，该参考信号是解调参考信号DMRS。
在一种可选的方式中，该第一信息承载在无线资源控制RRC信令中。
在一种可选的方式中，该第二信息承载在下行控制信息DCI信令中。
第三方面，提供了一种终端设备，用于执行第一方面或第一方面的任一种可能的实现方式中的方法，具体地，该终端设备可以包括用于执行第一方面或第一方面的任一种可能的实现方式的方法的单元。
第四方面，提供了一种网络设备，用于执行第二方面或第二方面的任一种可能的实现方式中的方法，具体地，该网络设备可以包括用于执行第二方面或第二方面的任一种可能的实现方式的方法的单元。
第五方面，提供一种终端设备，该终端设备包括：处理器，收发器和存储器。其中，存储器用于存储计算机执行指令，当该终端设备运行时，处理器执行该存储器存储的该计算机执行指令，以使该终端设备执行第一方面或第一方面中任一种可能的实现方式中的方法。
第六方面，提供一种网络设备，该网络设备包括：处理器，收发器和存储器。其中，存储器用于存储计算机执行指令，当该网络设备运行时，处理器执行该存储器存储的该计算机执行指令，以使该网络设备执行第二方面或第二方面中任一种可能的实现方式中的方法。
第七方面，提供了一种通信装置，包括处理器。该处理器与存储器耦合，可用于执行存储器中的指令，以实现上述第一方面或第一方面中任一种可能的实现方式中的方法。可选地，该通信装置还包括存储器。可选地，该通信装置还包括通信接口，处理器与通信接口耦合。
在一种实现方式中，该通信装置为终端设备，所述通信接口可以是收发器，或，输入/输出接口。
在另一种实现方式中，该通信装置为配置于终端设备中的芯片。当该通信装置为配置于终端设备中的芯片时，所述通信接口可以是输入/输出接口。
可选地，所述收发器可以为收发电路。可选地，所述输入/输出接口可以为输入/输出电路。
第八方面，提供了一种通信装置，包括处理器。该处理器与存储器耦合，可用于执行存储器中的指令，以实现上述第二方面或第二方面中任一种可能的实现方式中的方法。可选地，该通信装置还包括存储器。可选地，该通信装置还包括通信接口，处理器与通信接口耦合。
在一种实现方式中，该通信装置为网络设备，所述通信接口可以是收发器，或，输入/输出接口。
在另一种实现方式中，该通信装置为配置于网络设备中的芯片。当该通信装置为配置于网络设备中的芯片时，所述通信接口可以是输入/输出接口。
可选地，所述收发器可以为收发电路。可选地，所述输入/输出接口可以为输入/输出电路。
第九方面，提供了一种处理器，包括：输入电路、输出电路和处理电路。所述处理电路用于通过所述输入电路接收信号，并通过所述输出电路发射信号，使得所述处理器执行第一方面或第一方面中任一种可能的实现方式中的方法。
第十方面，提供了一种处理器，包括：输入电路、输出电路和处理电路。所述处理电路用于通过所述输入电路接收信号，并通过所述输出电路发射信号，使得所述处理器执行第二方面或第二方面中任一种可能的实现方式中的方法。
第十一方面，提供了一种处理装置，包括处理器和存储器。该处理器用于读取存储器中存储的指令，并可通过接收器接收信号，通过发射器发射信号，以执行第一方面或第一方面中任一种可能的实现方式中的方法。
可选地，所述处理器为一个或多个，所述存储器为一个或多个。
可选地，所述存储器可以与所述处理器集成在一起，或者所述存储器与处理器分离设置。
第十二方面，提供了一种处理装置，包括处理器和存储器。该处理器用于读取存储器中存储的指令，并可通过接收器接收信号，通过发射器发射信号，以执行第二方面或第二方面中任一种可能的实现方式中的方法。
可选地，所述处理器为一个或多个，所述存储器为一个或多个。
可选地，所述存储器可以与所述处理器集成在一起，或者所述存储器与处理器分离设置。
在具体实现过程中，上述处理器可以为芯片，输入电路可以为输入管脚，输出电路可以为输出管脚，处理电路可以为晶体管、门电路、触发器和各种逻辑电路等。输入电路所接收的输入的信号可以是由例如但不限于接收器接收并输入的，输出电路所输出的信号可以是例如但不限于输出给发射器并由发射器发射的，且输入电路和输出电路可以是同一电路，该电路在不同的时刻分别用作输入电路和输出电路。本申请实施例对处理器及各种电路的具体实现方式不做限定。
在具体实现过程中，存储器可以为非瞬时性(non-transitory)存储器，例如只读存储器(read only memory,ROM)，其可以与处理器集成在同一块芯片上，也可以分别设置在不同的芯片上，本申请实施例对存储器的类型以及存储器与处理器的设置方式不做限定。
应理解，相关的数据交互过程例如发送指示信息可以为从处理器输出指示信息的过程，接收能力信息可以为处理器接收输入能力信息的过程。具体地，处理器输出的数据可以输出给发射器，处理器接收的输入数据可以来自接收器。其中，发射器和接收器可以统称为收发器。
上述第十一方面或第十二方面中的处理装置可以是一个芯片，该处理器可以通过硬件来 实现也可以通过软件来实现，当通过硬件实现时，该处理器可以是逻辑电路、集成电路等；当通过软件来实现时，该处理器可以是一个通用处理器，通过读取存储器中存储的软件代码来实现，该存储器可以集成在处理器中，可以位于该处理器之外，独立存在。
第十三方面，提供了一种计算机可读存储介质，该计算机可读存储介质存储有程序，该程序使得计算机执行第一方面或第一方面的任一种可能的实现方式、或第二方面或第二方面的任一种可能的实现方式中的方法。
第十四方面，提供了一种计算机程序产品，该计算机程序产品包括：计算机程序代码，当该计算机程序代码被通信设备的通信单元、处理单元或收发器、处理器运行时，使得通信设备执行第一方面或第一方面的任一种可能的实现方式、或第二方面或第二方面的任一种可能的实现方式中的方法。
本发明的这些和其他方面在以下(多个)实施例的描述中会更加简明易懂。
附图说明
图1为本申请实施例提供的一种通信系统示意图；
图2为本申请实施例提供的一种网络设备和终端设备的结构示意图；
图3为本申请实施例提供的一种通信装置的协议栈结构示意图；
图4为本申请实施例提供的一种参考信号的指示方法的流程图；
图5为本申请实施例提供的一种参考信号端口分配的示意图；
图6为本申请实施例提供的另一种参考信号端口分配的示意图；
图7为本申请实施例提供的又一种参考信号端口分配的示意图；
图8为本申请实施例提供的一种网络设备的结构示意图；
图9为本申请实施例提供的一种终端设备的结构示意图；
图10为本申请实施例提供的一种芯片的结构示意图。
具体实施方式
为了更好地理解本申请实施例，在介绍本申请实施例之前，做出如下几点说明。
第一，在本申请中，“用于指示”可以包括用于直接指示和用于间接指示。当描述某一“指示信息”用于指示A时，可以包括该指示信息直接指示A或间接指示A，而并不代表该指示信息中一定携带有A。
将指示信息所指示的信息称为待指示信息，则具体实现过程中，对待指示信息进行指示的方式有很多种，例如但不限于，可以直接指示待指示信息，如待指示信息本身或者该待指示信息的索引等。也可以通过指示其他信息来间接指示待指示信息，其中该其他信息与待指示信息之间存在关联关系。还可以仅仅指示待指示信息的一部分，而待指示信息的其他部分则是已知的或者提前约定的。例如，还可以借助预先约定(例如协议规定)的各个信息的排列顺序来实现对特定信息的指示，从而在一定程度上降低指示开销。同时，还可以识别各个信息的通用部分并统一指示，以降低单独指示同样的信息而带来的指示开销。
此外，具体的指示方式还可以是现有各种指示方式，例如但不限于，上述指示方式及其各种组合等。各种指示方式的具体细节可以参考现有技术，本文不再赘述。由上文所述可知，举例来说，当需要指示相同类型的多个信息时，可能会出现不同信息的指示方式不相同的情形。具体实现过程中，可以根据具体的需要选择所需的指示方式，本申请实施例对选择的指示方式不做限定，如此一来，本申请实施例涉及的指示方式应理解为涵盖可以使得待指示方 获知待指示信息的各种方法。
待指示信息可以作为一个整体一起发送，也可以分成多个子信息分开发送，而且这些子信息的发送周期和/或发送时机可以相同，也可以不同。具体发送方法本申请不进行限定。其中，这些子信息的发送周期和/或发送时机可以是预先定义的，例如根据协议预先定义的，也可以是发射端设备通过向接收端设备发送配置信息来配置的。其中，该配置信息可以例如但不限于包括无线资源控制(radio resource control,RRC)信令、介质接入控制(medium access control,MAC)层信令和物理层信令中的一种或者至少两种的组合。其中，MAC层信令例如包括MAC控制元素(control element,CE)；物理层信令例如包括下行控制信息(downlink control information,DCI)。
第二，在下文示出的实施例中第一、第二以及各种数字编号仅为描述方便进行的区分，并不用来限制本申请实施例的范围。例如，区分不同的参考信号或指示信息等。
第三，“预定义”或“预配置”可以通过在设备(例如，包括终端设备和网络设备)中预先保存相应的代码、表格或其他可用于指示相关信息的方式来实现，本申请对于其具体的实现方式不做限定。其中，“保存”可以是指，保存在一个或者多个存储器中。所述一个或者多个存储器可以是单独的设置，也可以是集成在编码器或者译码器，处理器、或通信装置中。所述一个或者多个存储器也可以是一部分单独设置，一部分集成在译码器、处理器、或通信装置中。存储器的类型可以是任意形式的存储介质，本申请并不对此限定。
第四，本申请实施例中涉及的“协议”可以是指通信领域的标准协议，例如可以包括LTE协议、NR协议以及应用于未来的通信系统中的相关协议，本申请对此不做限定。
第五，“至少一个”是指一个或者多个，“多个”是指两个或两个以上。“和/或”，描述关联对象的关联关系，表示可以存在三种关系，例如，A和/或B，可以表示：单独存在A，同时存在A和B，单独存在B的情况，其中A，B可以是单数或者复数。字符“/”一般表示前后关联对象是一种“或”的关系。“以下至少一项(个)”或其类似表达，是指的这些项中的任意组合，包括单项(个)或复数项(个)的任意组合。例如，a、b和c中的至少一项(个)，可以表示：a，或，b，或，c，或，a和b，或，a和c，或，b和c，或，a、b和c。其中a、b和c分别可以是单个，也可以是多个。
第六，在本申请实施例中，“当……时”、“在……的情况下”、“若”以及“如果”等描述均指在某种客观情况下设备(如，终端设备或者网络设备)会做出相应的处理，并非是限定时间，且也不要求设备(如，终端设备或者网络设备)在实现时一定要有判断的动作，也不意味着存在其它限定。
在本申请的描述中，除非另有说明，“/”表示“或”的意思，例如，A/B可以表示A或B。本文中的“和/或”仅仅是一种描述关联对象的关联关系，表示可以存在三种关系，例如，A和/或B，可以表示：单独存在A，同时存在A和B，单独存在B这三种情况。此外，“至少一个”是指一个或多个，“多个”是指两个或两个以上。“第一”、“第二”等字样并不对数量和执行次序进行限定，并且“第一”、“第二”等字样也并不限定一定不同。
需要说明的是，本申请中，“示例性地”或者“例如”等词用于表示作例子、例证或说明。本申请中被描述为“示例性地”或者“例如”的任何实施例或设计方案不应被解释为比其他实施例或设计方案更优选或更具优势。确切而言，使用“示例性地”或者“例如”等词旨在以具体方式呈现相关概念。
本申请提供的技术方案可以应用于各种通信系统。本申请提供的技术方案可以应用于第五代(fifth generation,5G)移动通信系统，未来演进系统或多种通信融合系统等中，也可以 应用于在现有的其他通信系统，如宽带码分多址(wideband code division multiple access，WCDMA)系统、长期演进(Long Term Evolution,LTE)系统等。本申请提供的技术方案的应用场景可以包括多种，例如，机器对机器(machine to machine,M2M)、宏微通信、增强型移动宽带(enhanced mobile broadband,eMBB)、超高可靠性与超低时延通信(ultra reliable & low latency communication,uRLLC)以及海量物联网通信(massive machine type communication,mMTC)等场景。这些场景可以包括但不限于：终端与终端之间的通信场景，网络设备与网络设备之间的通信场景，网络设备与终端之间的通信场景等。下文中均是以本申请的技术方案应用于网络设备和终端通信的场景中为例进行说明的。
此外，本申请实施例描述的网络架构以及业务场景是为了更加清楚的说明本申请实施例的技术方案，并不构成对于本申请实施例提供的技术方案的限定，本领域普通技术人员可知，随着网络架构的演变和新业务场景的出现，本申请实施例提供的技术方案对于类似的技术问题，同样适用。
为便于理解本申请实施例，首先结合图1详细说明适用于本申请实施例提供的方法的通信系统100的示意图。如图所示，该通信系统100包括至少两个网络设备，如图1中所示的多个发送接收点(transmission and reception point,TRP)：TRP 1和TRP 2；该通信系统100还可以包括至少一个终端设备，如图1中所示的多个用户设备(user equipment,UE)：UE 1至UE 5。其中，终端设备UE 1至UE 5可以是移动的或固定的。一个网络设备可以和一个或多个终端设备通过无线链路通信。每个网络设备可以为特定的地理区域提供通信覆盖，并且可以与位于该覆盖区域内的终端设备通信。例如，网络设备可以向终端设备发送配置/调度信息，终端设备可以基于该配置信息接收网络设备发送的下行数据；又例如，终端设备还可以向网络设备发送上行数据。在图1所示的系统中，UE 1和UE 2处于TRP 1的覆盖范围，UE 3和UE 4处于TRP 1和TRP 2共同覆盖的范围，UE 5处于TRP 2的覆盖范围。可见，UE 3和UE 4既可以和TRP 1建立无线通信也可以和TRP 2建立无线通信。在这种情况下，TRP 1和TRP 2可以通过CJT联合为UE 3和UE 4提供通信服务。
应理解，图1示例性地示出了两个网络设备和多个终端设备，以及各通信设备之间的通信链路。在实际系统中，可以包含有更多的网络设备和终端设备，本申请对此不做限定。
上述各个通信设备，如图1中的网络设备(TRP 1和TRP 2)和终端设备(UE 1至UE 5)，可以配置多个天线。该多个天线可以包括至少一个用于发送信号的发射天线和至少一个用于接收信号的接收天线。另外，各通信设备还附加地包括发射机链和接收机链，本领域普通技术人员可以理解，它们均可包括与信号发送和接收相关的多个部件(例如处理器、调制器、复用器、解调器、解复用器或天线等)。因此，网络设备与终端设备之间可通过多天线技术通信。
可选地，该无线通信系统100还可以包括网络控制器、移动管理实体等其他网络实体，本申请实施例不限于此。
应理解，图1仅为示意图，并不构成对本申请提供的技术方案的适用场景的限定。
网络设备可以是无线通信的基站或基站控制器等。例如，所述基站可以包括各种类型的基站，例如：微基站(也称为小站)，宏基站，中继站，接入点等，本申请实施例对此不作具体限定。在本申请实施例中，所述基站可以是WCDMA中的基站(node B)，LTE中的演进型基站(evolutional node B,eNB或e-NodeB)，物联网(internet of things,IoT)或者窄带物联网(narrow band-internet of things,NB-IoT)中的eNB，无线保真(wireless fidelity,WiFi)系统中的接入点(access point,AP)、无线中继节点、无线回传节点、传输点(transmission point, TP)或者TRP等5G移动通信网络或者未来演进的公共陆地移动网络(public land mobile network,PLMN)中的基站，本申请实施例对此不作任何限制。
本申请所说的网络设备，例如基站，通常包括基带单元(baseband unit,BBU)、射频拉远单元(remote radio unit,RRU)或有源天线处理单元(active antenna unit,AAU)、天线、以及用于连接RRU/AAU和天线的馈线。其中，BBU用于负责信号调制。RRU用于负责射频处理。天线用于负责线缆上导行波和空气中空间波之间的转换。一方面，分布式基站大大缩短了RRU/AAU和天线之间馈线的长度，可以减少信号损耗，也可以降低馈线的成本。另一方面，RRU/AAU加天线比较小，可以随地安装，让网络规划更加灵活。除了RRU/AAU拉远之外，还可以把BBU全部都集中起来放置在中心机房(Central Office,CO)，通过这种集中化的方式，可以极大减少基站机房数量，减少配套设备，特别是空调的能耗，可以减少大量的碳排放。此外，分散的BBU集中起来变成BBU基带池之后，可以统一管理和调度，资源调配更加灵活。这种模式下，所有的实体基站演变成了虚拟基站。所有的虚拟基站在BBU基带池中共享用户的数据收发、信道质量等信息，相互协作，使得联合调度得以实现。
在一些部署中，基站可以包括集中式单元(central unit,CU)和分布式单元(distributed unit,DU)。基站还可以包括有源天线单元(active antenna unit,AAU)。CU实现基站的部分功能，DU实现基站的部分功能。比如，CU负责处理非实时协议和服务，实现无线资源控制，分组数据汇聚层协议(packet data convergence protocol,PDCP)层的功能。DU负责处理物理层协议和实时服务，实现无线链路控制(radio link control,RLC)、媒体接入控制和物理(physical,PHY)层的功能。AAU实现部分物理层处理功能、射频处理及有源天线的相关功能。由于RRC层的信息最终会变成PHY层的信息，或者，由PHY层的信息转变而来，因而，在这种架构下，高层信令，如RRC层信令或PDCP层信令，也可以认为是由DU发送的，或者，由DU+AAU发送的。可以理解的是，网络设备可以为包括CU节点、DU节点、AAU节点中一项或多项的设备。此外，CU可以划分为RAN中的网络设备，也可以将CU划分为核心网(core network,CN)中的网络设备，在此不做限制。
网络设备为小区提供服务，终端设备通过网络设备分配的传输资源(例如，频域资源，或者说，频谱资源)与小区进行通信，该小区可以属于宏基站(例如，宏eNB或宏gNB等)，也可以属于小小区(small cell)对应的基站，这里的小小区可以包括：城市小区(metro cell)、微小区(micro cell)、微微小区(pico cell)、毫微微小区(femto cell)等，这些小小区具有覆盖范围小、发射功率低的特点，适用于提供高速率的数据传输服务。
在本申请实施例中，终端设备也可以称为UE、接入终端、用户单元、用户站、移动站、移动台、远方站、远程终端、移动设备、用户终端、终端、无线通信设备、用户代理或用户装置。
终端设备可以是一种向用户提供语音/数据连通性的设备，例如，具有无线连接功能的手持式设备、车载设备等。目前，一些终端的举例可以为：手机(mobile phone)、平板电脑(pad)、带无线收发功能的电脑(如笔记本电脑、掌上电脑等)、移动互联网设备(mobile internet device,MID)、虚拟现实(virtual reality,VR)设备、增强现实(augmented reality,AR)设备、工业控制(industrial control)中的无线终端、无人驾驶(self-driving)中的无线终端、远程医疗(telemedicine)中的无线终端、智能电网(smart grid)中的无线终端、运输安全(transportation safety)中的无线终端、智慧城市(smart city)中的无线终端、智慧家庭(smart home)中的无线终端、蜂窝电话、无绳电话、会话启动协议(session initiation protocol,SIP)电话、无线本地环路(wireless local loop,WLL)站、个人数字助理(personal digital assistant,PDA)、具 有无线通信功能的手持设备、计算设备或连接到无线调制解调器的其它处理设备、车载设备、可穿戴设备，5G网络中的终端设备或者未来演进的PLMN中的终端设备等。
其中，可穿戴设备也可以称为穿戴式智能设备，是应用穿戴式技术对日常穿戴进行智能化设计、开发出可以穿戴的设备的总称，如眼镜、手套、手表、服饰及鞋等。可穿戴设备即直接穿在身上，或是整合到用户的衣服或配件的一种便携式设备。可穿戴设备不仅仅是一种硬件设备，更是通过软件支持以及数据交互、云端交互来实现强大的功能。广义穿戴式智能设备包括功能全、尺寸大、可不依赖智能手机实现完整或者部分的功能，例如：智能手表或智能眼镜等，以及只专注于某一类应用功能，需要和其它设备如智能手机配合使用，如各类进行体征监测的智能手环、智能首饰等。
此外，终端设备还可以是IoT系统中的终端设备。IoT是未来信息技术发展的重要组成部分，其主要技术特点是将物品通过通信技术与网络连接，从而实现人机互连，物物互连的智能化网络。IoT技术可以通过例如窄带(narrow band，NB)技术，做到海量连接，深度覆盖，终端省电。
此外，终端设备还可以包括智能打印机、火车探测器、加油站等传感器，主要功能包括收集数据(部分终端设备)、接收网络设备的控制信息与下行数据，并发送电磁波，向网络设备传输上行数据。
终端用于向用户提供语音和/或数据连通性服务。所述终端可以有不同的名称，例如用户设备(user equipment,UE)、接入终端、终端单元、终端站、移动站、移动台、远方站、远程终端、移动设备、无线通信设备、终端代理或终端装置等。可选的，所述终端20可以为各种具有通信功能的手持设备、车载设备、可穿戴设备、计算机，本申请实施例对此不作任何限定。例如，手持设备可以是智能手机。车载设备可以是车载导航系统。可穿戴设备可以是智能手环或者VR设备。计算机可以是PDA电脑、平板型电脑以及膝上型电脑(laptop computer)。
图2为本申请实施例提供的一种网络设备和终端设备的硬件结构示意图。
终端设备包括至少一个处理器101和至少一个收发器103。可选的，终端设备还可以包括输出设备104、输入设备105和至少一个存储器102。
处理器101、存储器102和收发器103通过总线相连接。处理器101可以是一个通用中央处理器(central processing unit,CPU)、微处理器、特定应用集成电路(application-specific integrated circuit,ASIC)，或者一个或多个用于控制本申请方案程序执行的集成电路。处理器101也可以包括多个CPU，并且处理器101可以是一个单核(single-CPU)处理器或多核(multi-CPU)处理器。这里的处理器可以指一个或多个设备、电路或用于处理数据(例如计算机程序指令)的处理核。
存储器102可以是只读存储器(read-only memory,ROM)或可存储静态信息和指令的其他类型的静态存储设备、随机存取存储器(random access memory,RAM)或者可存储信息和指令的其他类型的动态存储设备，也可以是电可擦可编程只读存储器(electrically erasable programmable read-only memory,EEPROM)、只读光盘(compact disc read-only memory,CD-ROM)或其他光盘存储、光碟存储(包括压缩光碟、激光碟、光碟、数字通用光碟、蓝光光碟等)、磁盘存储介质或者其他磁存储设备、或者能够用于携带或存储具有指令或数据结构形式的期望的程序代码并能够由计算机存取的任何其他介质，本申请实施例对此不作任何限制。存储器102可以是独立存在，通过总线与处理器101相连接。存储器102也可以和处理器101集成在一起。其中，存储器102用于存储执行本申请方案的应用程序代码，并由处理器101来控制执行。处理器101用于执行存储器102中存储的计算机程序代码，从而实现 本申请实施例提供的方法。
收发器103可以使用任何收发器一类的装置，用于与其他设备或通信网络通信，如以太网、无线接入网(radio access network,RAN)、无线局域网(wireless local area networks,WLAN)等。收发器103包括发射机Tx和接收机Rx。
输出设备104和处理器101通信，可以以多种方式来显示信息。例如，输出设备104可以是液晶显示器(liquid crystal display,LCD)，发光二级管(light emitting diode,LED)显示设备，阴极射线管(cathode ray tube,CRT)显示设备，或投影仪(projector)等。输入设备105和处理器101通信，可以以多种方式接收用户的输入。例如，输入设备105可以是鼠标、键盘、触摸屏设备或传感设备等。
网络设备包括至少一个处理器201、至少一个存储器202、至少一个收发器203和至少一个网络接口204。处理器201、存储器202、收发器203和网络接口204通过总线相连接。其中，网络接口204用于通过链路(例如S1接口)与核心网设备连接，或者通过有线或无线链路(例如X2接口)与其它网络设备的网络接口进行连接(图中未示出)，本申请实施例对此不作具体限定。另外，处理器201、存储器202和收发器203的相关描述可参考终端中处理器101、存储器102和收发器103的描述，在此不再赘述。
示例性的，本申请涉及的通信装置(包括网络设备和终端设备)的部分控制面与数据面协议栈结构如图3所示，网络设备和终端设备均具备如下模块：
无线资源控制(radio resource control，RRC)信令交互模块：网络设备和终端设备用于发送及接收RRC信令的模块，如网络设备向终端设备发送RRC信令，终端设备接收来自网络设备的RRC信令。
介质访问控制层(media access control，MAC)信令交互模块：网络设备和终端设备用于发送及接收媒体接入控制(medium access control，MAC)-控制单元(control element，CE)信令的模块，如网络设备向终端设备发送MAC-CE信令，终端设备接收来自网络设备的MAC-CE信令。
物理层(physical layer，PHY)信令及数据交互模块：网络设备和终端设备用于发送及接收上/下行控制信令，和上/下行数据的模块。例如，网络设备向终端设备发送物理下行控制信道(physical downlink control channel，PDCCH)，如PDCCH中的下行控制信息(downlink control information，DCI)，网络设备向终端设备发送物理下行共享信道(physical downlink shared channel，PDSCH)，如PDSCH中的下行数据。终端设备向网络设备发送物理上行控制信道(physical uplink control channel，PUCCH)，如PUCCH中的上行控制信息(uplink control information，UCI)，终端设备向网络设备发送物理上行共享信道(physical uplink shared channel，PUSCH)，如PUSCH中的上行数据。
应理解，图3所示的模块只是示例性的，网络设备和终端设备还可以包括其他通信模块，如无线链路控制(radio link control，RLC)模块、分组数据汇聚层协议(packet data convergence protocol，PDCP)模块、或业务数据适配协议(service data adaptation protocol，SDAP)模块等，本申请实施例对此不做具体限定。
为了便于理解本申请的技术方案，下面简单介绍本申请实施例所涉及的一些术语。
1)相干联合传输：多个网络设备在相同的资源(如时域资源、频域资源、时频域资源等)上联合为终端设备发送相同的数据，使得从多个网络设备发送的信号在终端设备处相干叠加，从而提高终端设备接收信号的信干燥比或信噪比，提升数据传输效率。
2)参考信号：用于信道测量或者信道估计等。参考信号例如可以包括解调参考信号 (demodulation reference signal,DMRS)、信道状态信息参考信号(channel state information reference signal,CSI-RS)和同步信号块(synchronization signal block,SSB)等。终端设备通过网络设备发送的参考信号进行信道测量或信道估计，从而获知终端设备与网络设备之间的无线信道的信道特征。
3)参考信号端口：用于指示参考信号的逻辑端口，参考信号的端口由参考信号占用的频域资源、时域资源以及复用码确定，属于相同端口的参考信号可认为经历相同的信道，属于不同端口的参考信号相互正交。
4)码分复用(code division multiplexing,CDM)组：用于区分占用相同时频资源的参考信号。在多个参考信号占用相同时频资源的情况下，通过加载不同的正交码区分不同的参考信号。属于不同CDM组的多个参考信号，该多个参考信号的端口是彼此不同的；属于同一CDM组的多个参考信号，该多个参考信号的端口可以是相同的，也可以是不同的。
以上是对本申请实施例的技术术语的简单介绍，以下不再赘述。
在现有相关技术中，相干联合传输是一种有效提升移动通信中处于多小区共覆盖区域的用户的服务质量(quality of service,QoS)、改善用户体验的数据传输方式。实现相干联合传输需要多个网络设备进行协同传输，为此，多个网络设备之间需要实时交互信息，例如对传输数据和相应的参考信号的资源分配的信息等。对于CRAN组网方式，可以认为网络设备之间具有低时延的理想回程传输，易于实现网络设备间的协同传输。对于IPRAN等分布式组网方式，网络设备之间的非理想回程传输时延可能是20ms甚至更长，无法实现网络设备之间的实时信息交互。如何实现非理想回程网络中网络设备间的相干联合传输，目前业界尚未有很好的解决方案。
在相干联合传输中的一个关键技术是实现联合等效信道的估计，即终端设备需要对多个参与相干联合传输的网络设备的信道进行联合估计，以解调来自多个网络设备的数据流。在CRAN组网的相干联合传输中，通常地，多个网络设备为相干联合传输中的每个数据流分配相同的参考信号端口，即每个网络设备对一个下行数据流都发送相同的参考信号。这样，终端设备不区分来自不同网络设备的参考信号，将多个网络设备的信道看做一个整体进行信道联合估计，并以估计的信道特征对来自多个网络设备的数据流进行解调。然而，在分布式组网中，在相关技术中，不同的网络设备之间不存在协同，终端设备分别估计每一个网络设备的信道，无法实现相干联合传输。终端设备如何获知来自不同网络设备的哪些参考信号用于进行联合等效信道估计，是非理想回程网络中相干联合传输得以应用需要解决的一个重要技术问题。为此，本申请实施例提供一种参考信号的指示方法，以使能在非理想回程网络中的相干联合传输，有效提升处于移动网络中多小区共覆盖区域的用户的QoS，改善用户体验。
本文具体提供了如下几种实施例，下面结合图4，以具体的方法实施例对本申请的技术方案进行详细说明。下面这几个具体的实施例可以相互结合，对于相同或相似的概念或过程可能在某些实施例不再赘述。需要说明的是，图4是本申请的方法实施例的示意性流程图，示出了该方法的详细的通信步骤或操作，但这些步骤或操作仅是示例，本申请实施例还可以执行其它操作或者图4中的各种操作的变形。此外，图4中的各个步骤可以分别按照与图4所呈现的不同的顺序来执行，并且有可能并非要执行图4中的全部操作。
图4示出本申请实施例提供的一种参考信号的指示方法的流程示意图。该方法400应用于多个(至少两个)网络设备与一个终端设备之间的交互。在本实施例中，以网络设备是TRP、终端设备是UE、参考信号是DMRS为例进行描述。需要说明的是，网络设备还可以是其他的网络侧的设备，终端设备也可以是其他的设备，参考信号也可以是其他类型的信号(如 CSI-RS信号、SSB信号等)，本申请对此不作具体限定。图4所示流程包含如下步骤：
S401、TRP 1确定UE的相干联合传输的资源。
其中，TRP 1是为UE提供相干联合传输的TRP集合中的任意一个TRP，UE的相干联合传输包括一个或多个下行数据流的传输。
同样地，TRP n确定UE的相干联合传输的资源。其中，n为大于1且小于等于N的整数，N是为UE提供相干联合传输的TRP集合中的TRP的数目，N为大于或等于2的整数。需要说明的是，图4中仅以TRP 1和TRP n为例描述，在实际应用中，该TRP集合中的全部TRP都分别执行该步骤。
需要说明的是，TRP 1确定的UE的相干联合传输的资源和TRP n确定的UE的相干联合传输的资源(如时频资源、频域资源、码域资源、时频域资源等)是相关联的。其中，UE的相干联合传输的资源包括一个或多个下行数据流占用的资源以及对应的DMRS占用的资源。在此，该TRP集合中的各个TRP对该UE的相干联合传输中的每一个下行数据流都分配相同的资源。示例性地，假设该TRP集合包括TRP 1和TRP 2，该UE的相干联合传输包括数据流1、数据流2和数据流3，则TRP 1和TRP 2都传输该UE的数据流1、数据流2和数据流3，并且，TRP 1分别为该三个下行数据流分配的资源与TRP 2分别为该三个下行数据流分配的资源相同。
在非理想回程的情况下，TRP 1和TRP 2之间是难以协调各自的资源分配的，例如，TRP1为数据流1初始分配资源1和资源2，TRP 2为数据流1初始分配资源2和资源3。为了保证TRP 1和TRP 2为UE的每一个下行数据流分配相同的资源，在一种可能的实现中，TRP 1将其初始资源分配情况指示给UE，TRP 2将其初始资源分配情况指示给UE，由UE更新资源分配状况并上报给TRP 1和TRP 2，以使TRP 1和TRP 2为UE分配的下行数据流的资源相同。例如，在上述例子中，UE可以将资源1、资源2和资源3分别上报给TRP 1和TRP 2，以使得TRP 1和TRP 2都使用资源1、资源2和资源3为UE传输数据流1，或都使用资源1、资源2和资源3中部分公共的资源为UE传输数据流1。在另一种可能的实现中，TRP 1将其初始资源分配情况指示给UE，TRP 2将其初始资源分配情况指示给UE，由UE资源分配状况上报给TRP 1、或TRP 2、或TRP 1和TRP 2的控制节点，以使TRP 1指示TRP 2、或TRP2指示TRP1、或控制节点指示TRP 1和TRP 2为UE分配的下行数据流的资源相同。同样地，TRP 1和TRP 2也使用相同的资源为UE传输数据流2，使用相同的资源为UE传输数据流3。应理解，上述仅为示例，本申请对TRP集合中各个TRP如何确定UE的相干联合传输的资源不作具体限定。
S402、TRP 1确定为UE的相干联合传输分配的一个或多个DMRS端口。
同样地，TRP n确定为UE的相干联合传输分配的一个或多个DMRS端口。
在该步骤中，TRP 1为UE的相干联合传输中的一个或多个下行数据流中的各个下行数据流分别确定相应的DMRS端口。一个DMRS端口和一个下行数据流一一对应。示例性地，UE的相干联合传输包括数据流1、数据流2和数据流3，则TRP1为每个数据流确定相应的DMRS端口，如数据流1对应DMRS端口1、数据流2对应DMRS端口2、数据流3对应DMRS端口3。需要说明的是，DMRS端口1对应的第一DMRS、DMRS端口2对应的第二DMRS以及DMRS端口3对应的第三DMRS占用相同或不同的时频资源，其中，占用相同时频资源的两个DMRS分别由不同的正交码序列构成。换言之，不同的下行数据流对应不同的DMRS以及不同的DMRS端口。
需要说明的是，图4中仅以TRP 1和TRP n为例描述，在实际应用中，该TRP集合中的 全部TRP都分别执行该步骤。由于各个TRP之间无需协调而自行分配DMRS端口，因此取决于各个TRP的DMRS端口的情况，不同的TRP为UE的相干联合传输中的同一个下行数据流可能分配相同的DMRS端口，也可能分配不同的DMRS端口。
在一种可能的实现方式中，该TRP集合中的不同TRP的DMRS端口属于不同的CDM组。也即，TRP i的所有DMRS端口属于CDM组i，TRP j的所有DMRS端口属于CDM组j，其中i不等于j。在这种情况下，由于每个TRP的DMRS属于不同的CDM组，所以每个TRP为UE的UE的相干联合传输分配的一个或多个DMRS端口均不同。
当UE的相干联合传输包括一个下行数据流时，该TRP集合中的各个TRP分别为该下行数据流分配不同的DMRS端口。图5示出两个TRP为UE的该下行数据流分别分配DMRS端口的示意图。在图5中，TRP 1为该下行数据流分配DMRS端口1，TRP2为该下行数据流分配DMRS端口2；DMRS端口1和DMRS端口2分别属于不同的CDM组。
当UE的相干联合传输包括多个下行数据流时，该TRP集合中的各个TRP分别为不同的下行数据流分配不同的DMRS端口，并且不同TRP分配的DMRS端口不存在相同的情况。图6示出两个TRP为UE的三个下行数据流分别分配DMRS端口的示意图。在图6中，TRP1为数据流1分配DMRS端口1，为数据流2分配DMRS端口2，为数据流3分配DMRS端口4；TRP2为数据流1分配DMRS端口5，为数据流2分配DMRS端口7，为数据流3分配DMRS端口8。其中，DMRS端口1、DMRS端口2和DMRS端口3属于一个CDM组，DMRS端口5、DMRS端口7和DMRS端口8属于另一个CDM组。
在另一种可能的实现方式中，当UE的相干联合传输仅包括一个下行数据流时，该TRP集合中的不同TRP的DMRS端口可以属于相同的CDM组。也即，TRP i的所有DMRS端口属于CDM组i，TRP j的所有DMRS端口属于CDM组j，其中i等于j。在这种情况下，由于每个TRP的DMRS属于相同的CDM组，所以每个TRP为该下行数据流所分配的DMRS端口可能相同，也可能不同。可选地，每个TRP为该下行数据流分配的DMRS端口不同，则与图5所示的类似，区别在于DMRS端口1和DMRS端口2属于同一个CDM组。可选地，每个TRP为该下行数据流分配的DMRS端口相同。图7示出两个TRP为UE的该下行数据流分别分配相同DMRS端口的示意图。在图7中，TRP 1为该下行数据流分配的DMRS端口与TRP 2为该下行数据流分配的DMRS端口均为DMRS端口1。
S403、TRP 1向UE发送第一信息，第一信息用于指示TRP 1的一个或多个DMRS用于估计联合等效信道。相应地，UE接收来自TRP 1的第一信息。
同样地，TRP n向UE发送第一信息。相应地，UE接收来自TRP n的第一信息。
TRP 1在前述S402中确定了UE的一个或多个下行数据流所对应的一个或多个DMRS端口。在该步骤中，TRP 1通知UE该一个或多个DMRS端口是用于估计联合等效信道的。对于UE的相干联合传输的一个下行数据流，UE从多个TRP处接收该下行数据流以及该下行数据流所对应的DMRS。UE根据从多个TRP接收的该DMRS进行联合等效信道估计，并根据估计的等效信道特征对接收的该下行数据流进行解调。为此，为UE提供相干联合传输的TRP集合中的各个TRP需要通知该UE其DMRS用于估计联合等效信道。需要说明的是，图4中仅以TRP 1和TRP n为例描述，在实际应用中，该TRP集合中的全部TRP都分别执行该步骤。
可选地，第一信息承载在RRC信令中。此外，第一信息还可以承载在MAC-CE信令中或DCI信令中。
可选地，第一信息承载在标准现有的RRC或MAC-CE或DCI信令中，如包含在现有信 令的字段(field)中，也可以承载在新的RRC或MAC-CE或DCI信令中。
S404、TRP 1向UE发送第二信息，第二信息用于指示TRP 1的一个或多个DMRS端口。相应地，UE接收来自TRP 1的第二信息。
同样地，TRP n向UE发送第二信息。相应地，UE接收来自TRP n的第二信息。
TRP 1在前述S402中确定了UE的相干联合传输中的一个或多个数据流所对应的一个或多个DMRS端口，并在前述S403中通知UE该一个或多个DMRS端口用于UE估计联合等效信道。在该步骤中，TRP 1将确定的该一个或多个DMRS端口的指示信息以第二信息发送给UE，以使得UE获取每个下行数据流所对应的DMRS端口的指示信息。需要说明的是，图4中仅以TRP 1和TRP n为例描述，在实际应用中，该TRP集合中的全部TRP都分别执行该步骤。
可选地，第二信息包括该一个或多个DMRS端口中各个DMRS端口的端口号、端口索引、或其他端口指示信息。
可选地，第二信息承载在物理层控制信令如DCI信令中。此外，第二信息还可以承载在MAC-CE信令中或RRC信令中。
可选地，第二信息承载在标准现有的RRC或MAC-CE或DCI信令中，如包含在现有信令的字段(field)中，也可以承载在新的RRC或MAC-CE或DCI信令中。
示例性地，在图5中，TRP 1可向UE发送DCI 1，其中DCI 1中的第二信息包含DMRS端口1的指示信息；TRP 2可向UE发送DCI 2，其中DCI 2中的第二信息包含DMRS端口2的指示信息。可选地，一个DMRS端口的指示信息包括该DMRS端口的端口号或端口索引。
示例性地，在图6中，TRP 1可向UE发送DCI 1，其中DCI 1中的第二信息包含DMRS端口1的指示信息、DMRS端口2的指示信息、以及DMRS端口4的指示信息；TRP 2可向UE发送DCI 2，其中DCI 2中的第二信息包含DMRS端口5的指示信息、DMRS端口7的指示信息、以及DMRS端口8的指示信息。
可选地，TRP 1根据第一规则将其多个DMRS端口的指示信息按一定的顺序包含在第二信息中。同样地，TRP n也根据第一规则将其多个DMRS端口的指示信息按顺序包含在第二信息中。由此，UE可以从各个TRP接收的DMRS端口指示信息的顺序中获知哪些DMRS端口是用于对某一个下行数据流进行联合等效信道估计的。示例性地，第一规则是多个DMRS端口的端口号或端口索引按照升序或降序与多个数据流所对应的传输层序号一一对应。应理解，在多个数据流传输中，每个数据流会被映射到一个传输层，多个数据流被分别映射到多个传输层。例如，在上述图6示例中，数据流1在TRP 1和TRP 2中都对应传输层1，数据流2在TRP 1和TRP 2中都对应传输层2，数据流3在TRP 1和TRP 2中都对应传输层3，则TRP 1按照DMRS端口1的指示信息、DMRS端口2的指示信息和DMRS端口3的指示信息的顺序发送第二信息，TRP 2按照DMRS端口5的指示信息、DMRS端口7的指示信息和DMRS端口8的指示信息的顺序发送第二信息。UE可以根据TRP 1和TRP 2各自发送的DMRS端口指示信息顺序确定DMRS端口1和DMRS端口5是用于估计传输层1的下行数据流的联合等效信道，DMRS端口2和DMRS端口7是用于估计传输层2的下行数据流的联合等效信道，DMRS端口4和DMRS端口8是用于估计传输层3的下行数据流的联合等效信道。其中，第一规则可以是预配置的，也可以是协议预定义的。
示例性地，在图7中，TRP 1可向UE发送DCI 1，其中DCI 1中的第一信息包含DMRS端口1的指示信息；TRP 2可向UE发送DCI 2，其中DCI 2中的第一信息也包含DMRS端口1的指示信息。
S405、TRP 1向UE发送相干联合传输数据。相应地，UE接收来自TRP 1的相干联合传输数据。
同样地，TRP n向UE发送相干联合传输数据。相应地，UE接收来自TRP n的相干联合传输数据。
其中，相干联合传输数据包含一个或多个下行数据流以及该一个或多个下行数据流相应的一个或多个DMRS。需要说明的是，一个下行数据流和该下行数据流对应的DMRS是在相同的时隙(slot)(或子帧(subframe))中传输的。例如，一个下行数据流可以在多个时隙(或子帧)中传输，并且该下行数据流对应的DMRS也在这个多个时隙(或子帧)中与该下行数据流的数据一起传输。在一个时隙(或子帧)中，UE会通过对该时隙(或子帧)中的DMRS的检测来估计信道，并根据该信道的特征对该时隙(或子帧)中的下行数据流进行解调。当相干联合传输包含多个下行数据流时，该多个下行数据流复用相同的时隙(或子帧)。需要说明的是，图4中仅以TRP 1和TRP n为例描述，在实际应用中，该TRP集合中的全部TRP都分别执行该步骤。
S406、UE确定联合等效信道。
在前述S404中，UE通过多个TRP分别发送的第二信息获取各个TRP分别为UE的相干联合传输分配的一个或多个DMRS端口的指示信息以及用于估计联合等效信道的DMRS。在前述S405中，UE接收到多个TRP各自发送的相干联合传输数据，其中相干联合传输数据包含一个或多个下行数据流以及相应的DMRS。在该步骤中，UE根据一个或多个DMRS端口的指示信息对该一个或多个下行数据流的信道进行估计，获取各个数据流的联合等效信道。
示例性地，对于图5所示的DMRS端口分配方式，TRP 1使用预编码矩阵P1对在DMRS端口1上发送的DMRS进行预编码，并发送预编码后的DMRS；TRP 2使用预编码矩阵P2对在DMRS端口2上发送的DMRS信号进行预编码，并发送预编码后的DMRS。一个TRP对一个DMRS进行预编码发送，可以理解为该TRP将该DMRS通过预编码矩阵变化后在特定空间方向上发送给终端设备。UE在前述步骤中获知DMRS端口1和DMRS端口2是用于估计联合等效信道。在该步骤中，UE通过检测DMRS端口1和DMRS端口2上发送的DMRS，确定该数据流的联合等效信道。例如，假设TRP 1与UE之间的信道表征为H1，TRP 2与UE之间的信道表征为H2，则UE通过DMRS确定的联合等效信道为[H1 H2][P1 P2]T，其中，AT表示为矩阵A的转置。
示例性地，对于图6所示的DMRS端口分配方式，TRP 1使用预编码矩阵P1,1对在DMRS端口1上发送的DMRS进行预编码，使用预编码矩阵P1,2对在DMRS端口2上发送的DMRS进行预编码，使用预编码矩阵P1,3对在DMRS端口4上发送的DMRS进行预编码，并发送预编码后的三个DMRS；TRP 2使用预编码矩阵P2,1对在DMRS端口5上发送的DMRS进行预编码，使用预编码矩阵P2,2对在DMRS端口7上发送的DMRS进行预编码，使用预编码矩阵P2,3对在DMRS端口8上发送的DMRS进行预编码，并发送预编码后的三个DMRS。UE在前述步骤中获知DMRS端口1和DMRS端口5是用于估计数据流1的联合等效信道，DMRS端口2和DMRS端口7是用于估计数据流2的联合等效信道，DMRS端口4和DMRS端口8是用于估计数据流3的联合等效信道。在该步骤中，UE分别对不同的下行数据流确定各自的联合等效信道。例如，UE通过检测DMRS端口1和DMRS端口5上发送的DMRS，确定下行数据流1对应的联合等效信道为[H1 H2][P1,1 P2,1]T。同理地，UE通过检测DMRS端口2和DMRS端口7上发送的DMRS，确定下行数据流2对应的联合等效信道为[H1 H2][P1,2 P2,2]T。UE通过检测DMRS端口4和DMRS端口8上发送的DMRS，确定下行 数据流3对应的联合等效信道为[H1 H2][P1,3 P2,3]T。
可选地，终端设备可以根据第一规则确定来自不同TRP的哪些DMRS端口是用于对某一个下行数据流进行联合等效信道估计的。
示例性地，对于图7所示的DMRS端口分配方式，TRP 1使用预编码矩阵P1对在DMRS端口1上发送的DMRS进行预编码，并发送预编码后的DMRS；TRP 2使用预编码矩阵P2对在DMRS端口1上发送的DMRS信号进行预编码，并发送预编码后的DMRS。UE通过检测DMRS端口1上发送的DMRS，确定联合等效信道。例如，TRP 1与UE之间的信道表征为H1，TRP 2与UE之间的信道表征为H2，则UE通过DMRS确定的联合等效信道为[H1 H2][P1 P2]T。需要说明的是，在图5示例中，由于各个TRP使用不同的DMRS端口，UE能分别估计各个TRP的等效信道，并进一步合并得到联合等效信道。在图7示例中，由于各个TRP使用相同的DMRS端口，UE无法区分不同TRP的信道，UE通过在一个DMRS端口上测量从而直接获得联合等效信道。
可选地，该方法还包括S407。
S407、UE根据联合等效信道进行下行数据流的解调。
在前述S405中，UE确定了一个或多个下行数据流中各个下行数据流对应的联合等效信道。在该步骤中，UE根据每个联合等效信道的信道参数对每个下行数据流进行解调，从而获得每个下行数据流的数据。具体地，UE如何根据一个下行数据流的联合等效信道对该数据流进行解调，可参考目前业界已有的各种方法，本申请对此不再赘述。
在本申请实施例方案中，为终端设备提供相干联合传输的多个网络设备分别指示用于估计联合等效信道的参考信号的信息，使得终端设备根据相应的指示信息估计多个网络设备的联合等效信道，从而使能在非理想回程网络中的相干联合传输，有效提升处于移动网络中多小区共覆盖区域的用户的QoS，改善用户体验。
上述主要从每一个网元之间交互的角度对本申请实施例提供的方案进行了介绍。可以理解的是，每一个网元，例如网络设备和终端，为了实现上述功能，其包含了执行每一个功能相应的硬件结构或软件模块，或两者结合。本领域技术人员应该很容易意识到，结合本文中所公开的实施例描述的各示例的单元及算法步骤，本申请能够以硬件或硬件和计算机软件的结合形式来实现。某个功能究竟以硬件还是计算机软件驱动硬件的方式来执行，取决于技术方案的特定应用和设计约束条件。专业技术人员可以对每个特定的应用来使用不同方法来实现所描述的功能，但是这种实现不应认为超出本申请的范围。
本申请实施例可以根据上述方法示例对网络设备和终端进行功能模块的划分，例如，可以对应每一个功能划分每一个功能模块，也可以将两个或两个以上的功能集成在一个处理模块中。上述集成的模块既可以采用硬件的形式实现，也可以采用软件功能模块的形式实现。需要说明的是，本申请实施例中对模块的划分是示意性的，仅仅为一种逻辑功能划分，实际实现时可以有另外的划分方式。下面以采用对应每一个功能划分每一个功能模块为例进行说明：
图8为本申请实施例提供的一种网络设备的结构示意图。如图8所示，网络设备包括通信单元801和处理单元802。其中，通信单元801用于支持网络设备执行图4中的S403和S405，和/或用于支持本文描述的技术方案的其他过程。处理单元802用于支持网络设备执行图4中的步骤S401和S402，和/或用于支持本文描述的技术方案的其他过程。
作为一个示例，结合图2所示的网络设备，图8中的通信单元801可以由图2中的收发器203来实现，图8中的处理单元702可以由图2中的处理器201来实现，本申请实施例对 此不作具体限定。
图9为本申请实施例提供的一种终端设备的结构示意图。如图9所示，终端设备包括通信单元901和处理单元902。其中，通信单元901用于支持终端设备执行图4中的步骤S403和S405，和/或用于支持本文描述的技术方案的其他过程。处理单元902用于支持终端设备执行图4中的步骤S404和S406，和/或用于支持本文描述的技术方案的其他过程。
作为一个示例，结合图2所示的终端设备，图9中的通信单元901可以由图2中的收发器103来实现，图9中的处理单元902可以由图2中的处理器101来实现，本申请实施例对此不作具体限定。
本申请实施例还提供一种计算机可读存储介质，所述计算机可读存储介质中存储有计算机指令；当所述计算机可读存储介质在通信装置上运行时，使得该通信装置执行如图3和图6所示的方法。所述计算机指令可以存储在计算机可读存储介质中，或者从一个计算机可读存储介质向另一个计算机可读存储介质传输，例如，所述计算机指令可以从一个网站站点、计算机、服务器或者数据中心通过有线(例如同轴电缆、光纤、数字用户线(digital subscriber line,DSL))或无线(例如红外、无线、微波等)方式向另一个网站站点、计算机、服务器或数据中心进行传输。所述计算机可读存储介质可以是计算机能够存取的任何可用介质或者是包含一个或多个可以用介质集成的服务器、数据中心等数据存储设备。所述可用介质可以是磁性介质(例如，软盘、硬盘、磁带)，光介质、或者半导体介质(例如固态硬盘(solid state disk,SSD))等。
本申请实施例还提供了一种包含计算机指令的计算机程序产品，当其在通信装置上运行时，使得通信装置可以执行图4所示的方法。
图10为本申请实施例提供的一种芯片的结构示意图。图10所示的芯片可以为通用处理器，也可以为专用处理器。该芯片包括处理器1001。其中，处理器1001用于支持通信装置执行图4所示的技术方案。
可选的，该芯片还包括收发管脚1002，收发管脚1002用于接受处理器1001的控制，用于支持通信装置执行图4所示的技术方案。
可选的，图10所示的芯片还可以包括：存储介质1003。
需要说明的是，图10所示的芯片可以使用下述电路或者器件来实现：一个或多个现场可编程门阵列(field programmable gate array,FPGA)、可编程逻辑器件(programmable logic device,PLD)、控制器、状态机、门逻辑、分立硬件部件、任何其他适合的电路、或者能够执行本申请通篇所描述的各种功能的电路的任意组合。
上述本申请实施例提供的终端、网络设备、计算机存储介质、计算机程序产品、芯片均用于执行上文所提供的方法，因此，其所能达到的有益效果可参考上文所提供的方法对应的有益效果，在此不再赘述。
尽管结合具体特征及其实施例对本申请进行了描述，显而易见的，在不脱离本申请的精神和范围的情况下，可对其进行各种修改和组合。相应地，本说明书和附图仅仅是所附权利要求所界定的本申请的示例性说明，且视为已覆盖本申请范围内的任意和所有修改、变化、组合或等同物。显然，本领域的技术人员可以对本申请进行各种改动和变型而不脱离本申请的精神和范围。这样，倘若本申请的这些修改和变型属于本申请权利要求及其等同技术的范围之内，则本申请也意图包含这些改动和变型在内。

Claims (29)

  1. 一种参考信号的指示方法，其特征在于，所述方法包括：
    终端设备接收来自多个网络设备的多个第一信息，其中，一个所述第一信息来自一个所述网络设备，所述第一信息用于指示所述网络设备的至少一个参考信号用于估计联合等效信道；
    所述终端设备接收来自所述多个网络设备的多个第二信息，其中，一个所述第二信息来自一个所述网络设备，所述第二信息用于指示所述至少一个参考信号的端口；
    所述终端设备接收来自所述多个网络设备的多个相干联合传输数据，其中，一个相干联合传输数据来自一个所述网络设备，所述相干联合传输数据包括至少一个数据流以及所述至少一个数据流对应的所述至少一个参考信号，一个所述数据流对应一个所述参考信号；以及
    所述终端设备根据所述多个网络设备的所述至少一个参考信号确定至少一个所述联合等效信道，其中，一个所述联合等效信道是根据所述多个网络设备的一个所述参考信号确定的。
  2. 根据权利要求1所述的方法，其特征在于，所述方法还包括：
    所述终端设备根据所述至少一个联合等效信道解调所述至少一个数据流，其中，一个所述数据流是通过一个所述联合等效信道解调的。
  3. 根据权利要求1或2所述的方法，其特征在于，所述参考信号是解调参考信号DMRS。
  4. 根据权利要求1至3中任一项所述的方法，其特征在于，所述第二信息包括所述至少一个参考信号中各个参考信号的端口号或端口索引。
  5. 根据权利要求1至4中任一项所述的方法，其特征在于，所述第一信息承载在无线资源控制RRC信令中。
  6. 根据权利要求1至5中任一项所述的方法，其特征在于，所述第二信息承载在下行控制信息DCI信令中。
  7. 一种参考信号的指示方法，其特征在于，所述方法包括：
    网络设备确定终端设备的相干联合传输的资源；
    所述网络设备确定为所述相干联合传输分配的至少一个参考信号的端口；
    所述网络设备向所述终端设备发送第一信息，所述第一信息用于指示所述至少一个参考信号用于估计联合等效信道；
    所述网络设备向所述终端设备发送第二信息，所述第二信息用于指示所述至少一个参考信号的端口；以及
    所述网络设备向所述终端设备发送相干联合传输数据，所述相干联合传输数据包括至少一个数据流以及所述至少一个数据流对应的所述至少一个参考信号，其中，一个所述数据流对应一个所述参考信号。
  8. 根据权利要求7所述的方法，其特征在于，所述第二信息包括所述至少一个参考信号中各个参考信号的端口号或端口索引。
  9. 根据权利要求7或8所述的方法，其特征在于，在所述网络设备向所述终端设备发送第二信息之前，所述方法还包括：
    所述网络设备根据第一规则确定第二信息包括的所述至少一个参考信号中各个参考信号的端口号或端口索引的排列顺序。
  10. 根据权利要求7至9中任一项所述的方法，其特征在于，所述参考信号是解调参考信号DMRS。
  11. 根据权利要求7至10中任一项所述的方法，其特征在于，所述第一信息承载在无线资源控制RRC信令中。
  12. 根据权利要求7至11中任一项所述的方法，其特征在于，所述第二信息承载在下行控制信息DCI信令中。
  13. 一种通信装置，其特征在于，包括：
    通信单元，用于接收来自多个网络设备的多个第一信息，其中，一个所述第一信息来自一个所述网络设备，所述第一信息用于指示所述网络设备的至少一个参考信号用于估计联合等效信道；
    所述通信单元，还用于接收来自所述多个网络设备的多个第二信息，其中，一个所述第二信息来自一个所述网络设备，所述第二信息用于指示所述至少一个参考信号的端口；
    所述通信单元，还用于接收来自所述多个网络设备的相干联合传输数据，其中，一个相干联合传输数据来自一个所述网络设备，所述相干联合传输数据包括至少一个数据流以及所述至少一个数据流对应的所述至少一个参考信号，一个所述数据流对应一个所述参考信号；以及
    处理单元，用于根据所述多个网络设备的所述至少一个参考信号确定至少一个所述联合等效信道，其中，一个所述联合等效信道是根据所述多个网络设备的一个所述参考信号确定的。
  14. 根据权利要求13所述的通信装置，其特征在于，
    所述处理单元，还用于根据所述至少一个联合等效信道解调所述至少一个数据流，其中，一个所述数据流是通过一个所述联合等效信道解调的。
  15. 根据权利要求13或14所述的通信装置，其特征在于，所述参考信号是解调参考信号DMRS。
  16. 根据权利要求13至15中任一项所述的通信装置，其特征在于，所述第二信息包括所述至少一个参考信号中各个参考信号的端口号或端口索引。
  17. 根据权利要求13至16中任一项所述的通信装置，其特征在于，所述第一信息承载在无线资源控制RRC信令中。
  18. 根据权利要求13至17中任一项所述的通信装置，其特征在于，所述第二信息承载在下行控制信息DCI信令中。
  19. 一种通信装置，其特征在于，包括：
    处理单元，用于确定终端设备的相干联合传输的资源；
    所述处理单元，还用于确定为所述相干联合传输分配的至少一个参考信号的端口；
    通信单元，用于向所述终端设备发送第一信息，所述第一信息用于指示所述至少一个参考信号用于估计联合等效信道；
    所述通信单元，还用于向所述终端设备发送第二信息，所述第二信息用于指示所述至少一个参考信号的端口；以及
    所述通信单元，还用于向所述终端设备发送相干联合传输数据，所述相干联合传输数据 包括至少一个数据流以及所述至少一个数据流对应的所述至少一个参考信号，其中，一个所述数据流对应一个所述参考信号。
  20. 根据权利要求19所述的通信装置，其特征在于，所述第二信息包括所述至少一个参考信号中各个参考信号的端口号或端口索引。
  21. 根据权利要求19或20所述的通信装置，其特征在于，
    所述处理单元，还用于根据第一规则确定第二信息包括的所述至少一个参考信号中各个参考信号的端口号或端口索引的排列顺序。
  22. 根据权利要求19至21中任一项所述的通信装置，其特征在于，所述参考信号是解调参考信号DMRS。
  23. 根据权利要求19至22中任一项所述的通信装置，其特征在于，所述第一信息承载在无线资源控制RRC信令中。
  24. 根据权利要求19至23中任一项所述的通信装置，其特征在于，所述第二信息承载在下行控制信息DCI信令中。
  25. 一种通信装置，其特征在于，包括：至少一个处理器和接口电路；
    所述接口电路，用于与所述通信装置之外的模块通信；
    所述至少一个处理器用于执行计算机程序或指令，以使所述通信装置执行如权利要求1至12中任一项所述的方法。
  26. 一种通信装置，其特征在于，包括：至少一个处理器和存储器；
    所述存储器，用于存储计算机程序或指令；
    所述至少一个处理器，用于执行所述计算机程序或指令，以使得如权利要求1至12中任一项所述的方法被执行。
  27. 一种芯片系统，其特征在于，所述芯片系统包括：处理电路；所述处理电路与存储介质耦合；
    所述处理电路，用于执行所述存储介质中的部分或者全部计算机程序或指令，当所述部分或者全部计算机程序或指令被执行时，用于实现如权利要求1至12任一项所述的方法。
  28. 一种计算机可读存储介质，其特征在于，所述计算机可读存储介质存储有指令，当所述指令被计算机执行时，使得如权利要求1至12中任一项所述的方法被执行。
  29. 一种包含计算机程序或指令的计算机程序产品，其特征在于，当其在计算机上运行时，使得上述权利要求1至12中任一项所述的方法被执行。
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