WO2019148314A1 - 一种信号发送方法及相关设备 - Google Patents

一种信号发送方法及相关设备 Download PDF

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Publication number
WO2019148314A1
WO2019148314A1 PCT/CN2018/074546 CN2018074546W WO2019148314A1 WO 2019148314 A1 WO2019148314 A1 WO 2019148314A1 CN 2018074546 W CN2018074546 W CN 2018074546W WO 2019148314 A1 WO2019148314 A1 WO 2019148314A1
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WIPO (PCT)
Prior art keywords
cell
csi
base station
target
target cell
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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/CN2018/074546
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English (en)
French (fr)
Inventor
李琦
国欢
樊华
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Huawei Technologies Co Ltd
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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 EP18904302.9A priority Critical patent/EP3737205B1/en
Priority to CN201880087740.XA priority patent/CN111656856B/zh
Priority to BR112020015357-5A priority patent/BR112020015357A2/pt
Priority to PCT/CN2018/074546 priority patent/WO2019148314A1/zh
Publication of WO2019148314A1 publication Critical patent/WO2019148314A1/zh
Priority to US16/942,280 priority patent/US11394444B2/en
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H04B7/0613—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
    • H04B7/0615—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal
    • H04B7/0619—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal using feedback from receiving side
    • H04B7/0621—Feedback content
    • H04B7/0626—Channel coefficients, e.g. channel state information [CSI]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/022—Site diversity; Macro-diversity
    • H04B7/024—Co-operative use of antennas of several sites, e.g. in co-ordinated multipoint or co-operative multiple-input multiple-output [MIMO] systems
    • 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
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/04—Wireless resource allocation
    • H04W72/044—Wireless resource allocation based on the type of the allocated resource
    • H04W72/0446—Resources in time domain, e.g. slots or frames
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/04—Wireless resource allocation
    • H04W72/044—Wireless resource allocation based on the type of the allocated resource
    • H04W72/0453—Resources in frequency domain, e.g. a carrier in FDMA
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/10—Connection setup
    • H04W76/11—Allocation or use of connection identifiers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
    • H04W88/08—Access point devices

Definitions

  • the present application relates to the field of wireless communications technologies, and in particular, to a signaling method and related device.
  • edge user terminals user terminals located in a common radiation area of different cells are referred to as edge user terminals, or edge users.
  • edge users due to the edge location of the edge user serving cell, the loss of the signal during the propagation process, that is, the path loss is large, resulting in weak downlink signal strength.
  • the downlink signal is susceptible to signal interference from other cells. Therefore, the signal to interference plus noise ratio (SINR) of the downlink signal of the edge user is lower, resulting in the user rate of the edge user being lower than other non-edges in the serving cell. User's user rate.
  • SINR signal to interference plus noise ratio
  • the transmission mode TM10 technology is introduced to achieve joint transmission between multiple cells to increase the user's transmission rate.
  • the target cell cell0 and the coordinated cell cell1 each transmit a channel state indication-reference signal (CSI-RS) to the edge user supporting the TM10 to perform channel state measurement, and the edge user will measure the two cells of cell0 and cell1.
  • Channel state indication (CSI) is fed back to cell0.
  • the cell0 After receiving the channel state information of the two cells, the cell0 indicates that the cell performs the joint transmission service channel, and notifies the service information and the CSI of the cell1 to the cell 1.
  • the cells of the cell 0 and the cell 1 send the physical downlink shared channel (PDSCH), which is the traffic channel carrying the same service information, to the edge user.
  • the cell 0 sends the service control channel to the edge user separately to assist the edge user to the two services.
  • the channel is decoded, where the service control channel is a physical downlink control channel (PDCCH).
  • PDSCH physical downlink control channel
  • the target cell cell0 and the coordinated cell cell1 each measure respective channel state information, and each transmits a PDSCH, so that the traffic channels transmitted by the two cells are irrelevant, and the edge cell receives two. After the PDSCH, the two PDSCHs are respectively decoded to obtain service information. Therefore, the above-mentioned TM10-based joint transmission mode can only implement non-coherent transmission.
  • the present application provides a signal sending method and related equipment, which are used to implement coherent joint transmission between cells, and improve downlink data signal strength of the terminal device.
  • a first aspect of the present application provides a signaling method, including:
  • the first base station determines a channel state information reference signal CSI-RS target pilot port for transmitting a target cell, and a coordinated cell of the target cell, where the coordinated cell is a cell that transmits a CSI-RS of the target cell for the target cell,
  • the target pilot port includes a pilot port of the target cell and a pilot port of the coordinated cell
  • the coordinated cell may be one cell or multiple cells;
  • the first base station determines the time-frequency resource location used by the target cell to jointly transmit the CSI-RS, that is, the target time-frequency resource location, and it should be understood that the target time-frequency resource location indicates the time-frequency resource of the CSI-RS of the transmitting target cell;
  • the first base station sends the CSI-RS of the target cell to the terminal on the target pilot port according to the target time-frequency resource location, where the signal strength of the terminal is lower than a preset threshold, and the terminal is located far away from the base station or other Factors such as channel occlusion cause weak signal strength.
  • the first base station may determine the neighboring cell of the target cell as the coordinated neighboring cell of the target cell, or within a certain period, the first base station collects the A3 measurement of the terminal in the target cell, and selects one of the A3 measurement reports exceeding the threshold or A plurality of cells serve as coordinated cells.
  • the signal transmission method in the present application has the following advantages:
  • the CSI-RS of the target cell is transmitted by the target cell and the coordinated cell.
  • the time-frequency resources used for the joint transmission are the same, and are the time-frequency resources indicated by the time-frequency resource location of the target cell.
  • the CSI-RS of the target cell is jointly delivered by the target cell and the coordinated cell to implement the target cell and Coherent joint transmission of the coordinated cell, so that the CSI of the target cell measured by the terminal is more accurate, so that the target cell can obtain greater gain when transmitting the downlink data, and improve the downlink data signal strength of the terminal.
  • the determining, by the first base station, the target time-frequency resource includes:
  • the first base station When the first base station acquires the cell identifier of the target cell, the first base station determines a CSI-RS configuration index of the target cell according to the cell identifier, where the CSI-RS configuration index indicates a time-frequency resource location used by the transmitting CSI-RS;
  • the method further includes:
  • the first base station sends CSI-RS configuration information to the terminal, where the CSI-RS configuration information is used to configure a non-zero transmission power CSI-RS configuration index of the terminal as a CSI-RS configuration index of the target cell, and zero transmission power of the terminal.
  • the CSI-RS configuration index is configured to include an index of a resource element (RE) of the following CSI-RS: 1. a non-zero power CSI-RS RE of the terminal, 2, a target cell as another target cell coordinated cell, and other
  • the RE of the CSI-RS that is jointly delivered by the target cell, and the coordinated cell is the RE of the CSI-RS jointly delivered by the other target cells.
  • RE resource element
  • the total number of non-zero transmission power CSI-RS ports of the first base station configuration terminal is equal to the total number of ports of the target pilot port.
  • the total number of ports of the target pilot port is 8
  • the non-zero transmission power of the terminal is CSI-
  • the total number of RS ports is also eight.
  • the CSI-RS configuration of the terminal may be used to enable the terminal to perform channel estimation on the target cell according to the CSI-RS of the target cell, and on the other hand, the target cell and the coordinated cell.
  • the target cell and the coordinated cell When updating, there is no need to reconfigure the CSI-RS configuration of the terminal to improve the update efficiency.
  • the coordinated cell is a cell covered by the first base station;
  • the total number is S, where the number of pilot ports of the target cell is A, the number of pilot ports of the coordinated cell is (SA), S is a positive integer not less than 2, and A is not less than 1 and less than S.
  • the first base station sends the CSI-RS of the target cell to the terminal on the target pilot port according to the target time-frequency resource location, including:
  • the first terminal sends the CSI-RS of the target cell to the terminal on the A pilot port of the target cell and the (S-A) pilot ports of the coordinated cell according to the time-frequency resource indicated by the time-frequency resource location.
  • the coordinated cell is a cell covered by the second base station, and the second base station is an a base station that overlaps with the coverage of the first base station;
  • the total number of target pilot ports is S, wherein the number of pilot ports of the coordinated cell is (SA), S is a positive integer not less than 2, and A is a positive integer not less than 1 and less than S;
  • the method further includes:
  • the first base station sends a first notification message to the second base station, where the first notification message carries the cell identifier of the coordinated cell, so that the second base station is in the coordinated cell according to the time-frequency resource indicated by the target time-frequency resource location.
  • the first base station sends the CSI-RS of the target cell to the terminal on the target pilot port according to the target time-frequency resource location, including:
  • the first base station When the coordinated cell is a cell in the second base station, the first base station sends the CSI-RS of the target cell to the terminal on the A pilot ports of the target cell according to the time-frequency resource indicated by the target time-frequency resource location.
  • the method further includes:
  • the first base station receives channel state information CSI of the target cell sent by the terminal;
  • the first base station sends the downlink data signal of the target cell to the terminal on the S data ports according to the CSI of the target cell, and the A data ports of the S data ports are in one-to-one correspondence with the A pilot ports of the target cell, S
  • the (SA) data port in the data ports corresponds to the (SA) pilot ports of the coordinated cell, wherein the data port and the pilot port correspond to the same physical antenna.
  • the first base station sends the downlink data signal of the target cell to the PDSCH, and sends the PDCCH to the terminal by using the S data port, and the first base station further sends a PDCCH to the terminal, so that the terminal demodulates the PDSCH. Downlink data of the target cell.
  • the method further includes:
  • the first base station receives channel state information CSI of the target cell sent by the terminal;
  • the first base station sends a second notification message to the second base station, where the second notification message carries the CSI of the target cell and the downlink data signal of the target cell, so that the second base station is on the (SA) data port according to the CSI of the target cell.
  • the first base station sends a downlink data signal of the target cell to the terminal on the A data ports according to the CSI of the target cell, where the A data ports are in one-to-one correspondence with the A pilot ports of the target cell, wherein the data port and the guide The frequency ports correspond to the same physical antenna.
  • the first base station sends the downlink data signal of the target cell to the PDSCH, and sends the PDCCH to the terminal, so that the terminal demodulates the PDSCH to obtain downlink data of the target cell.
  • the downlink data signal is jointly sent by the target cell and the coordinated cell to enable the phases of the signals arriving at the terminal to be the same, and the signals can be superimposed on each other to increase the signal strength of the downlink signal and improve the signal transmission efficiency.
  • a second aspect of the present application provides a signaling method, including:
  • the second base station receives the first notification message sent by the first base station, where the first notification message carries the cell identifier of the coordinated cell, and the first base station is the base station whose coverage area overlaps with the coverage of the second base station;
  • the second base station determines the target time-frequency resource location and the pilot port of the coordinated cell according to the cell identifier of the coordinated cell, where the target time-frequency resource location is the time-frequency resource location of the channel state information reference signal CSI-RS of the target cell, and the target cell is a cell covered by the first base station, where the number of pilot ports of the coordinated cell is (SA), S is a positive integer not less than 2, and A is a positive integer not less than 1 and less than S;
  • the second base station sends the CSI-RS of the target cell to the terminal on the (S-A) pilot ports of the coordinated cell according to the target time-frequency resource location, and the signal strength of the terminal is lower than a preset threshold.
  • the signal transmission method in the present application has the following advantages:
  • the second base station jointly sends the CSI-RS of the target cell on the pilot port of the coordinated cell, so that the terminal can more accurately measure the target cell according to the CSI-RS of the target cell jointly sent by the first base station and the second base station.
  • the CSI in order to obtain a larger transmit gain, improves the downlink data signal strength of the terminal.
  • the second base station sends the target to the terminal on the (SA) pilot ports of the coordinated cell according to the target time-frequency resource location.
  • the second base station receives the second notification message sent by the first base station, where the second notification message carries the channel state information CSI of the target cell and the downlink data signal of the target cell;
  • the second base station sends the downlink data signal of the target cell to the terminal on the (SA) data ports according to the CSI of the target cell, and the (SA) data ports correspond to the (SA) pilot ports of the coordinated cell.
  • the data port corresponds to the same physical antenna as the pilot port.
  • the phases of the signals are the same, and may be superimposed on each other to increase the signal strength of the downlink data signal and improve signal transmission. effectiveness.
  • a third aspect of the present application provides a signaling method, including:
  • the terminal receives the channel state information reference signal CSI-RS of the target cell, and the CSI-RS of the target cell is sent on the target pilot port according to the target time-frequency resource location, and the target time-frequency resource location is the CSI-RS of the target cell.
  • the time-frequency resource location, the target pilot port is a pilot port for jointly transmitting the CSI-RS of the target cell, the target pilot port includes a pilot port of the target cell and the coordinated cell, and the coordinated cell is jointly transmitting the target cell with the target cell.
  • Cell of CSI-RS Cell of CSI-RS;
  • the terminal performs channel measurement according to the CSI-RS of the target cell to obtain channel state information CSI of the target cell;
  • the terminal transmits the CSI of the target cell to the first base station.
  • the signal transmission method in the present application has the following advantages:
  • the CSI-RS of the target cell is jointly delivered by the target cell and the coordinated cell, and the coherent joint transmission of the target cell and the coordinated cell is implemented. Therefore, the CSI of the target cell measured by the terminal is more accurate, and the target cell is sent downlink data. Greater gain can be obtained to increase the downlink data signal strength of the terminal.
  • the method before the terminal receives the channel state information reference signal CSI-RS of the target cell, the method further includes:
  • the terminal receives the CSI-RS configuration information sent by the first base station, where the CSI-RS configuration information is used to indicate that the non-zero power channel state information reference signal CSI-RS configuration index of the terminal is the CSI-RS configuration index of the target cell, and the terminal zero
  • the power CSI-RS configuration index is an index of a resource element (RE) including the following CSI-RS: 1. a non-zero power CSI-RS RE of the terminal, 2, a target cell as another target cell coordinated cell, and other The RE of the CSI-RS that is jointly delivered by the target cell, 3.
  • RE resource element
  • the coordinated cell is the RE of the CSI-RS jointly sent by the other target cells, and the terminal is the terminal with the signal quality strength lower than the preset threshold, and the CSI-RS configuration of the target cell
  • the index is used to determine the target time-frequency resource, and the CSI-RS configuration index of the target cell is determined according to the cell identity of the target cell.
  • the CSI-RS configuration on the terminal may enable the terminal to perform channel estimation on the target cell according to the CSI-RS of the target cell, and on the other hand, when the target cell and the coordinated cell are updated, Reconfigure the CSI-RS configuration of the terminal to improve the update efficiency.
  • an embodiment of the present application provides a base station, where the base station has a function of implementing a behavior of a base station in the foregoing method embodiment.
  • This function can be implemented in hardware or in hardware by executing the corresponding software.
  • the hardware or software includes one or more modules corresponding to the functions described above.
  • an embodiment of the present application provides a base station, including: a processor, a memory, a bus, a transmitter, and a receiver; the memory is configured to store a computer to execute an instruction, and the processor is connected to the memory through the bus, when When the base station is in operation, the processor executes the computer-executed instruction stored in the memory to cause the base station to perform the signal transmitting method according to any one of the above first aspects.
  • an embodiment of the present application provides a computer readable storage medium, configured to store computer software instructions used by the base station, when executed on a computer, to enable the computer to perform any one of the foregoing first aspects.
  • Signal transmission method configured to transmit signals to the base station.
  • the embodiment of the present application provides a computer program product comprising instructions, which when executed on a computer, enable the computer to perform the signal transmission method of any of the above first aspects.
  • an embodiment of the present application provides a base station, where the base station has a function of implementing a behavior of a base station in the foregoing method embodiment.
  • This function can be implemented in hardware or in hardware by executing the corresponding software.
  • the hardware or software includes one or more modules corresponding to the functions described above.
  • an embodiment of the present application provides a base station, including: a processor, a memory, a bus, a transmitter, and a receiver; the memory is configured to store a computer execution instruction, and the processor is connected to the memory through the bus, when When the base station is in operation, the processor executes the computer-executed instructions stored in the memory to cause the base station to perform the signal transmitting method according to any one of the above second aspects.
  • the embodiment of the present application provides a computer readable storage medium, configured to store computer software instructions used by the base station, when executed on a computer, to enable the computer to perform any one of the foregoing second aspects.
  • Signal transmission method configured to transmit signals to the base station.
  • the embodiment of the present application provides a computer program product comprising instructions, which when executed on a computer, enable the computer to perform the signal transmitting method of any of the above second aspects.
  • the embodiment of the present application provides a terminal, where the terminal has a function of implementing terminal behavior in the foregoing method embodiment.
  • This function can be implemented in hardware or in hardware by executing the corresponding software.
  • the hardware or software includes one or more modules corresponding to the functions described above.
  • the embodiment of the present application provides a terminal, including: a processor, a memory, a bus, a transmitter, and a receiver; the memory is configured to store a computer to execute an instruction, and the processor is connected to the memory through the bus.
  • the processor executes the computer-executed instruction stored in the memory to cause the terminal to perform the signal transmitting method according to any one of the above third aspects.
  • the embodiment of the present application provides a computer readable storage medium, configured to store computer software instructions used by the terminal, and when executed on a computer, enable the computer to perform any one of the foregoing third aspects.
  • the signal transmission method of the item configured to transmit a signal to a computer.
  • the embodiment of the present application provides a computer program product comprising instructions, which when executed on a computer, enable the computer to perform the signal transmission method of any of the above third aspects.
  • the embodiment of the present application provides a communication device, where the communication device includes a processing component and a storage component, wherein the storage component is configured to store a computer program, and when the processing component invokes the computer program, the communication device is configured to execute The signal transmission method according to any one of the second aspect and the third aspect.
  • FIG. 1(a) is a schematic diagram of a system framework of a signal sending method in an embodiment of the present application
  • FIG. 1(b) is a schematic diagram of another system framework of a signal sending method in an embodiment of the present application
  • FIG. 2 is a schematic diagram of an embodiment of a signal sending method in an embodiment of the present application.
  • FIG. 3(a) is a schematic diagram of another embodiment of a signal sending method according to an embodiment of the present application.
  • FIG. 3(b) is a schematic diagram of an application scenario of a signal sending method in an embodiment of the present application
  • FIG. 4(a) is a schematic diagram of another embodiment of a signal sending method in an embodiment of the present application.
  • FIG. 4(b) is a schematic diagram of another application scenario of the signal sending method in the embodiment of the present application.
  • FIG. 5 is a schematic diagram of an embodiment of a first base station according to an embodiment of the present application.
  • FIG. 6 is a schematic diagram of another embodiment of a first base station according to an embodiment of the present application.
  • FIG. 7 is a schematic diagram of an embodiment of a second base station according to an embodiment of the present application.
  • FIG. 8 is a schematic diagram of an embodiment of a terminal in an embodiment of the present application.
  • FIG. 9 is a schematic structural diagram of a hardware of a first base station according to an embodiment of the present application.
  • FIG. 10 is a schematic structural diagram of a hardware of a second base station according to an embodiment of the present application.
  • FIG. 11 is a schematic structural diagram of a hardware of a terminal in an embodiment of the present application.
  • the present application provides a signal sending method and related equipment, which can implement coherent joint transmission between cells, and improve downlink data signal strength of the terminal device.
  • the technical solutions in the present application are clearly and completely described in the following with reference to the drawings in the present application. It is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments.
  • the signal transmission method in the present application is used in a wireless communication system, for example, a global system of mobile communication (GSM) system, a code division multiple access (CDMA) system, and a wideband code division multiple access (wideband) Code division multiple access wireless (WCDMA) system, general packet radio service (GPRS) system, universal mobile telecommunications system (UMTS), LTE system and its subsequent evolution systems, such as next-generation wireless communication System (new generation, NR).
  • GSM global system of mobile communication
  • CDMA code division multiple access
  • WCDMA wideband code division multiple access wireless
  • WCDMA wideband Code division multiple access wireless
  • GPRS general packet radio service
  • UMTS universal mobile telecommunications system
  • LTE long-generation wireless communication System
  • new generation, NR next-generation wireless communication System
  • the base station may be a long term evolution (LTE) system or an evolved base station (evolutional Node B in an authorized auxiliary access long-term evolution (LAA-LTE) system.
  • LTE long term evolution
  • LAA-LTE authorized auxiliary access long-term evolution
  • a eNB or e-NodeB a macro base station, a micro base station (also referred to as a "small base station"), a pico base station, an access point (AP) or a transmission point (TP), or a gNodeB (new generation Node) B, a new generation of base stations) and so on.
  • the cell mentioned in the present application may be a cell corresponding to the base station, and the cell may belong to a macro base station, or may belong to a small base station or a micro base station corresponding to a small cell, where the small cell may include: a 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-speed data transmission services.
  • a terminal refers to a terminal device, which can also be called a user equipment (UE), a mobile station (MS), a mobile terminal (Intel terminal), and the like.
  • the terminal can be accessed via a radio access network (radio access).
  • Network, RAN communicates with one or more core networks.
  • the terminal may be a mobile phone (or "cellular" phone), a computer with a mobile terminal, etc., and the terminal may also be a portable, pocket, handheld, computer built-in or in-vehicle mobile device and in a future 5G network.
  • Terminals which exchange voice or data with the radio access network.
  • the terminal may further include a relay relay, and the base station may perform data communication as a terminal.
  • FIG. 1(a) is a schematic diagram of a system framework of a signal sending method in the present application, including: a first base station, a second base station, and a terminal.
  • Figure 1 (a) shows an application scenario of the signal transmission method of the present application.
  • the target cell accessed by the terminal is in the coverage of the first base station
  • the coordinated cell of the target cell is in the coverage of the second base station.
  • the coverage of the first base station and the second base station overlap, and the coverage area with a weak signal strength is an overlapping coverage area of the first base station and the second base station, which may be caused by two factors: 1.
  • the coverage area of the base station is radiated outward by the base station center, so the overlapping coverage area between the base stations is far away from the base station; 2.
  • the overlapping coverage area is simultaneously covered by two or more base stations, and signals between the base stations Will interfere with each other and cause weak signal strength.
  • the first base station and the second base station cooperate to jointly transmit the channel state information reference signal, and the terminal measures the feedback channel state information.
  • the specific transmission diagram is as shown in FIG. 1(b), and the first base station sends downlink control information and downlink data information to the terminal, The second base station sends downlink data information to the terminal.
  • the terminal having weak signal strength shown in FIGS. 1(a) and 1(b) above is located in the range of the overlapping service area of the first base station and the second base station.
  • the terminal may also be located at other locations where the signal strength is weak, such as an edge region between two cells under the coverage of the same base station.
  • the coordinated cell may be one or more cells, and the terminals are all within the coverage of the one or more cells.
  • the signal transmission method in the present application may be understood as a method for cooperatively transmitting downlink data signals between base station cells, and the purpose thereof is to improve terminal signal strength with weak signal strength.
  • the following embodiments are abbreviated as terminals.
  • the signal sending method in this application is described in detail below with reference to specific embodiments:
  • the target cell is a serving cell of the terminal
  • the terminal is a terminal with weak signal strength within the coverage of the target cell signal.
  • the target cell and the coordinated cell jointly transmit the received signal strength of the terminal.
  • an embodiment of a signal sending method in the embodiment of the present application includes:
  • the first base station determines a target pilot port and a coordinated cell of the target cell, where the target pilot port includes a pilot port of the target cell and the coordinated cell.
  • the target cell is a serving cell that provides services for the terminal
  • the coordinated cell is a cell that is jointly transmitted with the target cell to the terminal.
  • the first base station may periodically, by using the A3 measurement report information received by the mobile phone first base station or other base stations, and select one or more cells that send the A3 measurement report times as the coordinated cell.
  • the first base station determines a resource location of the target time-frequency resource.
  • the first base station first acquires a cell identifier of the target cell, and then the first base station determines a CSI-RS configuration index of the target cell according to the cell identifier of the target cell, and finally, the first base station configures the CSI-RS according to the target cell.
  • the index determines the resource location of the target time-frequency resource to determine the target time-frequency resource.
  • the first base station may further perform the following operations:
  • the first base station sends the CSI-RS configuration information to the terminal, where the CSI-RS configuration information is used to indicate that the non-zero power CSI-RS configuration index of the terminal is the CSI-RS configuration index of the target cell, and the zero-power CSI-RS configuration of the terminal.
  • the index is an index that includes the following three types of CSI-RS resource elements: the RE of the non-zero-power CSI-RS of the terminal, the RE of the CSI-RS that the target cell jointly delivers by other target cells, and the coordinated cell are combined with other target cells.
  • the RE of the CSI-RS sent is an index that includes the following three types of CSI-RS resource elements: the RE of the non-zero-power CSI-RS of the terminal, the RE of the CSI-RS that the target cell jointly delivers by other target cells, and the coordinated cell are combined with other target cells.
  • the RE of the CSI-RS sent is an index that includes the following three types of CSI-RS resource elements: the RE of the non-zero-
  • the non-zero power CSI-RS configuration index and the zero-power CSI-RS configuration index of the terminal are configured by using the foregoing configuration manner, where the first base station configures the non-zero power CSI-RS configuration index of the terminal as the CSI of the target cell.
  • the RS configuration index may enable the terminal to perform channel estimation only on the CSI-RS signal carried on the target time-frequency resource.
  • the first base station configures the zero-power CSI-RS configuration index of the terminal as the above three types of indexes, so that when the target cell sends an update, such as updating to the other target cells, it is not necessary to configure the non-zero-power CSI-RS index of the terminal. Reconfigure to improve update efficiency.
  • the first base station sends the CSI-RS of the target cell to the terminal on the target pilot port according to the target time-frequency resource.
  • the first base station carries the CSI-RS of the target cell on the target time-frequency resource, and sends the CSI-RS of the target cell to the terminal through the target pilot port, where the terminal is a terminal whose signal quality strength is lower than a preset threshold.
  • the coordinated cell determined in the foregoing step 201 may be a cell under the coverage of the first base station, such as a neighboring cell of the target cell, or may be a cell covered by the second base station.
  • the target pilot port includes both the pilot port of the target cell and the pilot port of the coordinated cell. Therefore, it is easy to know that when the coordinated cell is under the coverage of the first base station, the first base station can transmit signals through the pilot port of the target cell or through the pilot port of the coordinated cell.
  • the first base station cannot send a signal through the pilot port of the coordinated cell, and the second base station needs to cooperate with the first base station to perform joint transmission.
  • the target pilot port since the target pilot port has both the pilot port of the target cell and the pilot port of the coordinated cell, the CSI-RS of the target cell is jointly sent by the target cell and the coordinated cell, and the joint sending station
  • the resource locations of the used time-frequency resources are the same, and are the resource locations of the target time-frequency resources corresponding to the target cell.
  • the CSI-RS of the target cell that is received by the terminal is that the CSI-RS of the target cell is jointly sent by the target cell and the coordinated cell using the same time-frequency resource (ie, coherent joint transmission), therefore,
  • the signal sending method in this embodiment may implement coherent joint transmission of the target cell and the coordinated cell, so that the phases of the two signals received by the terminal (ie, the signals corresponding to the target cell and the coordinated cell) may be superimposed on each other to increase terminal reception.
  • the signal strength of the CSI-RS is such that the CSI of the target cell measured by the terminal is more accurate, so that the target cell can obtain greater gain when transmitting the downlink data, and improve the downlink data signal strength of the terminal.
  • the target cell is within the coverage of the first base station, and the coordinated cell is within the coverage of the second base station;
  • another embodiment of the signal sending method in the embodiment of the present application includes:
  • the first base station determines a target pilot port and a coordinated cell of the target cell.
  • a target pilot port for joint transmission by the target cell and the coordinated cell, where the target pilot port includes a pilot port of the target cell and a pilot port of the coordinated cell, where the target cell is covered by the first base station.
  • the first base station determines the coordinated cell of the target cell, where the first base station determines a second base station that overlaps with its coverage, and the first base station periodically collects the A3 measurement report of the second base station, and the second base station is configured.
  • One or more cells with a large number of A3 measurement reports are covered as a coordinated cell.
  • the total number of the target pilot ports is S, including the A pilot ports of the target cell and the (SA) pilot ports of the coordinated cell, where S is a positive integer not less than 2, and the typical value is 8, 16 Or 32, A is a positive integer not less than 1 and less than S;
  • the first base station determines a target time-frequency resource location.
  • the first base station determines the target time-frequency resource, and the target time-frequency resource is a time-frequency resource corresponding to the channel state information reference signal CSI-RS of the target cell corresponding to the target cell, which is also referred to as a time-frequency resource of the target cell.
  • the first base station determines, according to the cell identifier of the target cell, a channel state information reference signal configuration index CSI-RS configuration index of the target cell, where the CSI-RS configuration index is used to determine a frequency domain/time domain location of the CSI-RS transmission.
  • the CSI-RS configuration index of the target cell may be determined by using (CellID mod N) as an index to determine the CSI-RS configuration index, where N is an integer, typically 3 or 6, and the CSI-RS of the target cell
  • the configuration index can also take a fixed value as an index.
  • the first base station configures a CSI-RS of the terminal, and the first base station sends CSI-RS configuration information to the terminal, and performs the following configuration on the terminal:
  • the non-zeros power (NZP) CSI-RS configuration index is configured as the CSI-RS configuration index of the target cell, and the number of the non-zeros power CSI-RS ports of the terminal is configured as S, that is, the target cell.
  • the total number of pilot ports of the coordinated cell, and the zero-power (ZP) CSI-RS configuration index of the terminal is configured to cover the index of the following CSI-RS resource element (RE): 1.
  • the RE of the zero-power CSI-RS, the target cell as the other target cell coordinated cell, the CSI-RS RE delivered jointly with the other target cell, and the coordinated cell are the CSI-RS REs jointly issued by other target cells. .
  • the first base station sends a first notification message to the second base station.
  • the first base station After determining the time-frequency resource location of the target cell, the first base station sends a first notification message to the second base station, where the first message carries the cell identifier of the coordinated cell, so that the second base station indicates the time-frequency resource location according to the target cell.
  • the time-frequency resource transmits the CSI-RS of the target cell to the terminal on the (SA) pilot ports of the coordinated cell.
  • the first base station sends, according to the target time-frequency resource location, a channel state information reference signal of the target cell to the terminal on the pilot port of the target cell.
  • the first base station sends, to the terminal, the CSI-RS of the CSI-RS configuration index of the target cell, that is, the CSI-RS of the target cell, and the target time-frequency resource location is the CSI-RS of the target cell, on the A pilot port of the target cell.
  • the configuration index indicates that it is obtained.
  • the method further includes: determining, by the first base station, that the first base station selects, by the first base station, the target cell of the first base station and the terminal of the second base station in the overlapping service area as a terminal. It is easy to know that when the signal strength of the current serving cell of the terminal drops to a certain threshold, the terminal actively sends an A3 measurement report to the base station. Therefore, the A3 measurement can be used as a basis for the base station to select a terminal with poor signal quality.
  • the second base station sends, according to the target time-frequency resource location, a channel state information reference signal of the target cell to the terminal on the pilot port of the coordinated cell.
  • the second base station sends, to the terminal, the CSI-RS of the CSI-RS configuration index of the target cell, that is, the CSI-RS of the target cell, on the (SA) pilot ports of the coordinated cell, where the target time-frequency resource location is from the target cell.
  • the CSI-RS configuration index indication is obtained.
  • the number of coordinated cells is one when the two cells are jointly transmitted, that is, the number of the coordinated cells is one.
  • the CSI-RS of the target cell is sent to the terminal on the pilot port of the third cell, and the second base station sends the CSI-RS of the target cell to the terminal on the pilot port with the port number of 4 to 7.
  • the two base cells (cooperative cell 1 and coordinated cell 2) are taken as an example, and the first base station is still in the port number 0 to 3.
  • the CSI-RS of the target cell is sent to the terminal on the frequency port, and the second base station sends the CSI-RS of the target cell to the terminal on the pilot port with the port number 4 to 7, wherein the pilot port with the port number is 4 and 5.
  • the pilot ports with port numbers 6 and 7 correspond to the coordinated cell 2.
  • the terminal performs channel measurement according to the channel state information reference signal of the target cell to obtain channel state information of the target cell.
  • the terminal performs channel measurement according to the received CSI-RS of the target cell to obtain channel state information CSI of the target cell, where the CSI includes a channel quality indication (CQI), a rank indication (RI), and a precoding code.
  • CQI channel quality indication
  • RI rank indication
  • PMI Precoding matrix indication
  • the PMI the terminal measurement channel is calculated and fed back to The base station, the base station adopts the PMI to perform precoding, and better matches the channel to obtain precoding gain; and RI: indicates the number of multiplexed streams that the channel can support.
  • the first base station configures the transmission mode of the terminal as TM9, and the number of ports of the PMI measured by the terminal is the same as the number of NZP CSI-RS ports configured to the terminal, and the PMI is weighted to the PDSCH of the TM9, The number of ports on the PDSCH is the same as the number of NZP CSI-RS ports configured for the terminal.
  • the terminal sends channel state information of the target cell to the first base station.
  • the terminal reports the CSI of the target cell to the first base station, where the CSI includes CQI, PMI, and RI.
  • the first base station sends a second notification message to the second base station according to channel state information of the target cell.
  • the first base station determines a modulation and coding scheme (MCS), a RANK, and a PMI of the PDSCH channel sent to the terminal according to the CQI, PMI, and RI fed back by the terminal, and the first base station carries the MCS, RANK, and PMI. And a second notification message of the downlink data information is sent to the second base station.
  • MCS modulation and coding scheme
  • RANK radio access control
  • the first base station sends a downlink data signal of the target cell to the terminal according to the channel state information of the target cell.
  • the first base station determines the MCS, RANK, and PMI of the PDSCH channel sent to the terminal according to the CQI, PMI, and RI fed back by the terminal, and transmits the PDSCH channel carrying the downlink data information to the terminal on the A data ports, where A The data port is in one-to-one correspondence with the A pilot ports of the target cell, and the data port and the pilot port correspond to the same physical antenna.
  • the transmission mode of the PDSCH channel is TM9.
  • the number of ports of the PDSCH that sends the TM9 is the same as the number of the NZP CSI-RS ports that are configured to the terminal.
  • the number of NZP CSI-RS ports of the terminal is the same as the number of target pilot ports. Therefore, the first base station transmits the PDSCH of TM9 to the terminal on the A pilot ports of the target cell.
  • the first base station sends the PDCCH corresponding to the PDSCH of the TM9 to the terminal, where the PDCCH is used to carry downlink control information for assisting demodulation of the downlink data information.
  • the channel state information reference signal of the target cell of the second base station sends a downlink data signal of the target cell to the terminal.
  • the second base station After the second base station receives the second notification message sent by the first base station, the second base station generates a PDSCH channel according to the MCS, the RANK, and the PMI carried in the second notification message, and carries the downlink data information on the PDSCH channel.
  • the (SA) data port transmits the PDSCH channel to the terminal, where the pilot port and the data port correspond to the same physical antenna.
  • the second base station sends the PDSCH of the TM9 to the terminal on the (S-A) pilot ports of the coordinated cell.
  • the first base station and the second base station respectively send CSI-RSs to the terminal on the pilot ports of the target cell and the coordinated cell according to the indication of the same CSI-RS configuration index, so that the target cell and the coordinated cell pass the joint.
  • the channel is transmitted, so that the target finally measures more accurate channel state information, and a larger coherent transmission gain is obtained, and the transmission weight PMI obtained by the CSI-RS feedback sent by the joint channel is weighted to the PDSCH channel of the TM9, and
  • the PDSCH sent by the first base station and the second base station arrives at the terminal, the PDSCH is in phase, so the enhanced signal strength can be phase superimposed, thereby improving the signal strength of the received signal of the terminal.
  • Application scenario 1 As shown in Figure 3(b), Xiao Ming uses the mobile phone to talk with others.
  • Xiao Ming is located in the service range of the first base station, and the voice service is performed between the mobile phone and the first base station.
  • the mobile phone moves to the direction of the arrow in the figure, when Huawei moves to the overlapping service area of the first base station and the second base station in the figure, the signal strength of the mobile phone is weak due to the interference of the second base station and the distance from the first base station.
  • the mobile phone starts measuring the signal strength of the surrounding second base station, and sends an A3 measurement report request to the first base station to request the handover.
  • the first base station determines the mobile phone as the terminal, and the first base station sends a notification message to the second base station, and the notification is notified.
  • the second base station assists the first base station to send a voice signal to the mobile phone of Huaweing.
  • the first base station and the second base station send a voice signal to the mobile phone of Huaweing to enhance the mobile phone signal of Huaweing. Strength to ensure normal calls.
  • the target cell and the coordinated cell are both within the coverage of the first base station
  • another embodiment of the signal sending method in the embodiment of the present application includes:
  • the first base station determines a target pilot port and a coordinated cell of the target cell.
  • a target pilot port for joint transmission by the target cell and the coordinated cell, where the target pilot port includes a pilot port of the target cell and a pilot port of the coordinated cell, where the target cell is covered by the first base station.
  • the first base station uses one or more neighboring cells of the target cell as the coordinated cell. For example, three adjacent sectors of one base station may be fixed to each other as a coordinated cell.
  • the first base station determines a target time-frequency resource location.
  • Step 402 is similar to step 302 above. For detailed description, refer to step 302 above, and details are not described herein again.
  • the first base station sends a channel state information reference signal of the target cell to the terminal on the pilot port of the target cell and the coordinated cell according to the target time-frequency resource location.
  • the first base station sends the CSI-RS of the CSI-RS configuration index of the target cell to the terminal on the A pilot port of the target cell and the (SA) pilot ports of the coordinated cell, that is, the CSI-RS of the target cell, and the target
  • the time-frequency resource location is indicated by the CSI-RS configuration index of the target cell.
  • step 403 The remaining related descriptions of the step 403 are similar to the related descriptions in the above steps 304 and 305. For a detailed description, refer to the related descriptions of the above steps 304 and 305, and details are not described herein again.
  • the method further includes: the first base station, the terminal with the weak signal strength at the edge of the target cell and the coordinated cell as the terminal, and the specific determining method may also be based on the A3 measurement report reported by the terminal to the base station,
  • the specific determining method may also be based on the A3 measurement report reported by the terminal to the base station,
  • the terminal performs channel measurement according to the channel state information reference signal of the target cell to obtain channel state information of the target cell.
  • the terminal sends channel state information of the target cell to the first base station.
  • Step 404 and step 405 are similar to step 306 and step 307 respectively.
  • steps 306 and 307 refer to related descriptions of steps 306 and 307 above, and details are not described herein again.
  • the first base station sends, to the terminal, a downlink data signal of the target cell according to the channel state information of the target cell.
  • the step 406 is similar to the related description in the foregoing steps 309 and 310.
  • the difference is that the first base station in the step 406 performs the above step 309 because the coordinated cell and the target cell are in the same coverage area as the first base station.
  • the operations performed by the second base station in the foregoing step 310 are also performed.
  • steps 309 and 310 above and details are not described herein again.
  • the target cell and the coordinated cell are transmitted by the joint coherent transmission of the target cell and the coordinated cell under the coverage of the same base station, so that the PDSCH sent by the pilot port of the target cell and the pilot port of the coordinated cell can be reached.
  • the PDSCH can be superimposed in the same phase to improve the signal strength of the received signal of the terminal and improve the transmission efficiency of the downlink data.
  • Application scenario 2 As shown in FIG. 4(b), cell 1, cell 2, and cell 3 are three neighboring cells under the coverage of the base station, and the three cells are mutually coordinated cells.
  • Xiao Ming uses the mobile phone to talk with others.
  • Xiaoming is located in the service area of the base station's serving cell 1, and the voice is transmitted between the serving cell 1 and the mobile phone.
  • Huawei makes a call and moves toward the cell 3 toward the arrow in the figure.
  • the edge service area of the cell 1 moves, and finally stops at the position at the end of the arrow. Since the location of Xiaoming is far away from the center of the base station, the signal strength is weak.
  • the cell 1 notifies the cell 3 to jointly transmit the mobile phone of Huaweing, and further
  • the cell 1 combined cell 3 sends a joint voice signal to Huawei's mobile phone to enhance the signal strength of Huaweing's mobile phone and ensure normal call.
  • the foregoing embodiment provides a detailed description of the signal transmission method in the present application from the coverage of the base station of the coordinated cell and the target cell.
  • the first base station, the second base station, and the terminal in the present application are described in detail below, as follows:
  • the first base station 50 in this embodiment of the present application includes:
  • the processing module 501 is configured to determine a target pilot port and a coordinated cell of the target cell, where the coordinated cell is a cell that jointly sends a channel state information reference signal CSI-RS of the target cell, and the target pilot port is used for the joint sending target.
  • a pilot port of a CSI-RS of a cell where the target pilot port includes a pilot port of the target cell and the coordinated cell;
  • the processing module 501 is further configured to determine a resource location of the target time-frequency resource, where the target time-frequency resource is a time-frequency resource used for sending the CSI-RS of the target cell;
  • the sending module 502 is configured to send, according to the target time-frequency resource, the CSI-RS of the target cell to the terminal on the target pilot port, where the signal strength of the terminal is lower than a preset threshold.
  • the processing module 501 is specifically configured to:
  • the sending module 502 is further configured to:
  • the CSI-RS configuration information is used to indicate that the non-zero power CSI-RS configuration index of the terminal is a CSI-RS configuration index of the target cell
  • the zero-power CSI-RS configuration index of the terminal includes the following The index of the three types of CSI-RS resource elements RE: the RE of the non-zero-power CSI-RS of the terminal, the RE of the CSI-RS that the target cell jointly delivers by other target cells, and the CSI that the coordinated cell jointly delivers to other target cells.
  • RS RE The index of the three types of CSI-RS resource elements RE: the RE of the non-zero-power CSI-RS of the terminal, the RE of the CSI-RS that the target cell jointly delivers by other target cells, and the CSI that the coordinated cell jointly delivers to other target cells.
  • the coordinated cell is a cell covered by the first base station;
  • the total number of target pilot ports is S, and the number of pilot ports of the target cell is A, and the coordinated cell guide
  • the number of frequency ports is (SA), S is a positive integer not less than 2, and A is a positive integer not less than 1 and less than S;
  • the processing module 601 is specifically configured to:
  • the CSI-RS of the target cell is transmitted to the terminal on the A pilot port of the target cell and the (S-A) pilot ports of the coordinated cell.
  • the first base station 60 further includes:
  • the receiving module 603 is configured to receive channel state information CSI of the target cell that is sent by the terminal.
  • the sending module 602 is further configured to:
  • the downlink data signal of the target cell is sent to the terminal on the S data ports, and the A data ports of the S data ports are in one-to-one correspondence with the A pilot ports of the target cell, and the S data ports are respectively The (SA) data port in the one-to-one correspondence with the (SA) pilot ports of the coordinated cell.
  • the coordinated cell is a cell covered by the second base station, and the second base station is a base station that overlaps coverage of the first base station;
  • the total number of target pilot ports is S.
  • the number of pilot ports of the coordinated cell is (SA), S is a positive integer not less than 2, and A is a positive integer not less than 1 and less than S;
  • the sending module 602 is further configured to:
  • the processing module 601 is specifically configured to:
  • the CSI-RS of the target cell is sent to the terminal on the A pilot ports of the target cell.
  • the first base station 60 further includes:
  • the receiving module 603 is configured to receive CSI of the target cell sent by the terminal.
  • the sending module 602 is further configured to:
  • Sending a downlink data signal of the target cell, and the (SA) data port is in one-to-one correspondence with the (SA) pilot ports of the coordinated cell;
  • the downlink data signals of the target cell are sent to the terminal on the A data ports, and the A data ports are in one-to-one correspondence with the A pilot ports of the target cell.
  • the first base station uses the labels of 50 and 60 respectively, only to distinguish whether it is shown in FIG. 5 or the requirement shown in FIG. 6, and there is no other difference.
  • 50 is used to identify the first base station, which is not described below.
  • the above processing module 501 may specifically be the processor 901 shown in FIG. 9, and the sending module 502 (or 602) and the receiving module 603 may specifically be the transceiver 902 shown in FIG.
  • the second base station 70 in this embodiment of the present application includes:
  • the receiving module 701 is configured to receive a first notification message that is sent by the first base station, where the first notification message carries a cell identifier of the coordinated cell, where the first base station is a base station whose coverage area overlaps with the coverage of the second base station;
  • the processing module 702 is configured to determine, according to the cell identifier of the coordinated cell, a resource location of the target time-frequency resource and a pilot port of the coordinated cell, where the target time-frequency resource is used to send the channel state information reference signal CSI-RS of the target cell
  • the frequency resource, the target cell is a cell covered by the first base station, the number of pilot ports of the coordinated cell is (SA), S is a positive integer not less than 2, and A is a positive integer not less than 1 and less than S;
  • the sending module 703 is configured to send, according to the target time-frequency resource, the CSI-RS of the target cell to the terminal on the (S-A) pilot ports of the coordinated cell, where the signal strength of the terminal is lower than a preset threshold.
  • the receiving module 701 is further configured to:
  • the sending module is also used to:
  • the downlink data signal of the target cell is transmitted to the terminal on the (S-A) data ports, and the (S-A) data ports are in one-to-one correspondence with the (S-A) pilot ports of the coordinated cell.
  • the processing module 702 may be specifically the processor 1001 shown in FIG. 10, and the receiving module 701 and the sending module 703 may specifically be the transceiver 1002 shown in FIG.
  • the terminal 80 in this embodiment of the present application includes:
  • the receiving module 801 is configured to receive a channel state information reference signal CSI-RS of the target cell, where the CSI-RS of the target cell is carried on the target time-frequency resource and sent to the terminal through the target pilot port, where the target pilot port includes the target cell and a pilot port of the coordinated cell, where the coordinated cell is a cell that sends a CSI-RS of the target cell in association with the target cell, and the signal quality strength of the terminal is lower than a preset threshold;
  • the processing module 802 is configured to acquire channel state information CSI of the target cell according to the CSI-RS of the target cell.
  • the sending module 803 is configured to send the CSI of the target cell to the first base station.
  • the receiving module 801 is further configured to:
  • the CSI-RS configuration index is an index that includes the following three types of CSI-RS resource elements RE: the RE of the non-zero-power CSI-RS of the terminal, the RE of the CSI-RS that the target cell jointly delivers by other target cells, and the coordinated cell are other
  • the CSI-RS configuration index of the target cell is used to determine the target time-frequency resource, and the CSI-RS configuration index of the target cell is determined according to the cell identifier of the target cell.
  • the processing module 802 may be specifically the processor 111 shown in FIG. 11 .
  • the receiving module 801 and the sending module 803 may specifically be the transceiver 112 shown in FIG. 11 .
  • the hardware structure of the first base station, the second base station, and the terminal are respectively described in detail below, as follows:
  • the first base station 90 includes:
  • transceiver 902 a transceiver 902, a processor 901, a memory 903, and a network interface 904;
  • the first base station 90 provides UE-to-network wireless access, including one or more processors 901, one or more memories 902, one or more network interfaces 904, and one or more transceivers 902 (each transceiver) It includes a receiver Rx and a transmitter Tx) connected via a bus.
  • One or more transceivers 902 are coupled to the antenna or antenna array.
  • the one or more processors 901 include computer program code or computer operating instructions.
  • Network interface 904 is coupled to core network device 91 via a link (e.g., a link to the core network) or to other base stations (e.g., second base station 10) via a wired or wireless link.
  • the processor 901 performs the related operations of the first base station in FIG. 3(a) and FIG. 4(a) by calling the computer program code or the computer operation instruction stored in the foregoing memory 902.
  • the processor 901 performs the related operations of the first base station in FIG. 3(a) and FIG. 4(a) by calling the computer program code or the computer operation instruction stored in the foregoing memory 902.
  • the network may also include a core network device 91, such as a network control equipment (NCE), a mobility management entity (MME), or a signaling gateway (SGW), which may provide further network connections, such as Telephone network and/or data communication network (such as the Internet).
  • the first base station 90 can be connected to the core network device 91 via a link (e.g., an S1 interface).
  • the core network device 91 includes one or more processors 911, one or more memories 912, and one or more network interfaces 913 that are connected by a bus.
  • the one or more memories 912 include computer program code or computer operating instructions.
  • the embodiment of the present application further provides a computer storage medium for storing computer software instructions used by the terminal, when the computer is running on the computer, so that the computer can execute the signal sending method performed by the first base station 90.
  • the storage medium may specifically be the foregoing storage 912.
  • the embodiment of the present application further provides a computer program product comprising instructions, which when executed on a computer, enable the computer to execute a signal transmission method performed by the terminal.
  • the second base station 100 includes:
  • transceiver 1002 a transceiver 1002, a processor 1001, a memory 1003, and a network interface 1004;
  • the second base station 100 provides UE-to-network wireless access, including one or more processors 1001, one or more memories 1002, one or more network interfaces 1004, and one or more transceivers 1002 (each transceiver) It includes a receiver Rx and a transmitter Tx) connected via a bus.
  • One or more transceivers 1002 are coupled to the antenna or antenna array.
  • the one or more processors 1001 include computer program code or computer operating instructions.
  • the network interface 1004 is coupled to the core network device 110 via a link (e.g., a link to the core network) or to other base stations (e.g., the first base station 90) via a wired or wireless link.
  • the processor 101 performs the related operations of the second base station in FIG. 4(a) by calling the computer program code or the computer operation instruction stored in the foregoing memory 1002.
  • FIG. 4(a) A related description of the second base station in the embodiment is further described herein.
  • the network may also include a core network device 110, such as a network control equipment (NCE), a mobility management entity (MME), or a signaling gateway (SGW), which may provide further network connections, such as Telephone network and/or data communication network (such as the Internet).
  • the second base station 100 can be connected to the core network device 110 via a link (e.g., an S1 interface).
  • the core network device 110 includes one or more processors 1101, one or more memories 1102, and one or more network interfaces 1103 that are connected by a bus.
  • the one or more memories 1102 include computer program code or computer operating instructions.
  • the embodiment of the present application further provides a computer storage medium for storing computer software instructions used by the terminal, when the computer is running on the computer, so that the computer can execute the signal sending method performed by the second base station 100.
  • the storage medium may specifically be the above-mentioned memory 1002.
  • the embodiment of the present application further provides a computer program product comprising instructions, which when executed on a computer, enable the computer to execute a signal transmission method performed by the terminal.
  • the terminal 11 includes:
  • processor 111 a processor 111, a transceiver 112 and a memory 113;
  • the terminal 11 is referred to as the UE 11 for wireless communication through the link and the base station.
  • the UE 11 includes one or more processors 111, one or more memories 113, and one or more transceivers 112 (each transceiver including a transmitter Tx and a receiver Rx) connected by a bus.
  • One or more transceivers 112 are coupled to one or more antennas.
  • One or more memories 113 include computer program code or computer operating instructions.
  • the processor 901 performs the related operations of the terminal in FIG. 3(a) and FIG. 4(a) by calling the computer program code or the computer operation instruction stored in the foregoing memory 902. For details, refer to FIG. 3 above. (a) A description of the terminal in the embodiment corresponding to FIG. 4(a), which will be further described herein.
  • the embodiment of the present application further provides a computer storage medium for storing computer software instructions used by the terminal, and when executed on a computer, enables the computer to execute the signal transmission method performed by the terminal 11.
  • the storage medium may specifically be the foregoing storage 113.
  • the embodiment of the present application further provides a computer program product comprising instructions, which when executed on a computer, enable the computer to execute a signal transmission method performed by the terminal.
  • the embodiment of the present application further provides a communication device, where the communication device includes: a processing component and a storage component, wherein the storage component is used to store a computer program, and when the processing component invokes the computer program, the communication device is configured to execute the signal sending method.
  • the communication device includes: a processing component and a storage component, wherein the storage component is used to store a computer program, and when the processing component invokes the computer program, the communication device is configured to execute the signal sending method. The operations performed by the terminal, the first base station, or the second base station in the embodiment.
  • the base station may be any one of the base stations mentioned above, and the UE may also be any one of the terminals mentioned above, and no limitation is imposed herein.
  • the memory included in the UE, base station, and core network device may be of a type suitable for any local technology environment and may be implemented using any suitable data storage technology.
  • the computer program product includes one or more computer instructions.
  • the computer can be a general purpose computer, a special purpose computer, a computer network, or other programmable device.
  • the computer instructions can be stored in a computer readable storage medium or transferred from one computer readable storage medium to another computer readable storage medium, for example, the computer instructions can be from a website site, computer, server or data center Transmission to another website site, computer, server or data center via wired (eg coaxial cable, fiber optic, digital subscriber line (DSL)) or wireless (eg infrared, wireless, microwave, etc.).
  • the computer readable storage medium can be any available media that can be stored by a computer or a data storage device such as a server, data center, or the like that includes one or more available media.
  • the usable medium may be a magnetic medium (eg, a floppy disk, a hard disk, a magnetic tape), an optical medium (eg, a DVD), or a semiconductor medium (eg, a solid state disk (SSD)) or the like.
  • a magnetic medium eg, a floppy disk, a hard disk, a magnetic tape
  • an optical medium eg, a DVD
  • a semiconductor medium eg, a solid state disk (SSD)
  • the disclosed system, apparatus, and method may be implemented in other manners.
  • the device embodiments described above are merely illustrative.
  • the division of the unit is only a logical function division.
  • there may be another division manner for example, multiple units or components may be combined or Can be integrated into another system, or some features can be ignored or not executed.
  • the mutual coupling or direct coupling or communication connection shown or discussed may be an indirect coupling or communication connection through some interface, device or unit, and may be in an electrical, mechanical or other form.
  • the units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, may be located in one place, or may be distributed to multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of the embodiment.
  • each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.
  • the above integrated unit can be implemented in the form of hardware or in the form of a software functional unit.
  • the integrated unit if implemented in the form of a software functional unit and sold or used as a standalone product, may be stored in a computer readable storage medium.
  • a computer readable storage medium A number of instructions are included to cause a computer device (which may be a personal computer, server, or network device, etc.) to perform all or part of the steps of the methods described in various embodiments of the present application.
  • the foregoing storage medium includes: a U disk, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disk, and the like, which can store program code. .

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Abstract

本申请提供了一种信号发送方法及相关设备，用于实现小区之间的相干联合发送，提高终端设备的下行数据信号强度。本申请方法包括：第一基站确定目标导频端口和目标小区的协作小区，所述协作小区为与所述目标小区联合发送所述目标小区的信道状态信息参考信号CSI-RS的小区，所述目标导频端口为用于联合发送所述目标小区的CSI-RS的导频端口，所述目标导频端口包括所述目标小区和所述协作小区的导频端口；所述第一基站确定目标时频资源的资源位置，所述目标时频资源为用于发送所述目标小区的CSI-RS的时频资源；所述第一基站根据所述目标时频资源，在所述目标导频端口上，向终端发送所述目标小区的CSI-RS，所述终端的信号强度低于预设门限值。

Description

一种信号发送方法及相关设备 技术领域
本申请涉及无线通信技术领域，尤其涉及一种信号发送方法及相关设备。
背景技术
当前，将位于不同小区的共同辐射区域中的用户终端称为边缘用户终端，或称边缘用户。一方面，由于边缘用户服务小区的边缘位置，造成信号在传播过程中的损耗即路损较大，导致下行信号强度较弱，另一方面，由于边缘用户位于不同小区的交叠服务范围内，下行信号容易受到来自其他小区的信号干扰，因此，边缘用户的下行信号的信干噪比(signal to interference plus noise ratio，SINR)较低，导致边缘用户的用户速率低于服务小区中其他非边缘用户的用户速率。
由此，引入了传输模式TM10技术以实现多个小区之间的联合发射提高用户的发射速率。目标小区cell0和协作小区cell1各自向支持TM10的边缘用户发送信道状态信息参考信号(channel state indication-reference signal，CSI-RS)进行信道状态测量，边缘用户将测量到的cell0和cell1两个小区的信道状态信息(channel state indication，CSI)反馈给cell0。在cell0接收到两个小区的信道状态信息之后，cell0指示cell进行联合发送业务信道，并将业务信息及cell1的CSI通知给cell1。最终，cell0和cell1小区向边缘用户发送携带有相同业务信息的业务信道即物理下行共享信道(Physical Downlink Shared Channel，PDSCH)，cell0小区单独向边缘用户发送业务控制信道辅助边缘用户对上述两个业务信道进行解码，其中业务控制信道即是物理下行控制信道(physical downlink control channel，PDCCH)。
在上述基于TM10的联合发送方式中，由于目标小区cell0和协作小区cell1各自测量各自的信道状态信息，并且各自下发PDSCH，导致两个小区发送的业务信道是不相干的，边缘小区接收到两个PDSCH之后，分别对两个PDSCH进行解码，得到业务信息，因此，上述基于TM10的联合发送方式只能实现非相干发射。
发明内容
本申请提供了一种信号发送方法及相关设备，用于实现小区之间的相干联合发送，提高终端设备的下行数据信号强度。
本申请的第一方面提供一种信号发送方法，包括：
首先，第一基站确定用于发送目标小区的信道状态信息参考信号CSI-RS目标导频端口，以及目标小区的协作小区，其中，协作小区是为目标小区发送目标小区的CSI-RS的小区，应理解目标导频端口包括目标小区的导频端口和协作小区的导频端口，协作小区可以是一个小区也可以是多个小区；
其次，第一基站确定目标小区用于联合发送CSI-RS的时频资源位置，即目标时频资源位置，应理解目标时频资源位置指示了发送目标小区的CSI-RS的时频资源；最后第一 基站根据目标时频资源位置，在目标导频端口上，向终端发送目标小区的CSI-RS，其中，终端的信号强度低于预设门限值，终端处于由于距离基站较远或其他信道遮挡等因素造成信号强度较弱的位置。
可选的，第一基站可以将目标小区的邻区确定为目标小区的协作邻区，或在一定周期内，第一基站收集目标小区内终端的A3测量，选择A3测量报告超过阈值的一个或多个小区作为协作小区。
从以上技术方案可以看出，本申请中的信号发送方法具有以下优点：
由于目标导频端口包括目标小区和协作小区的导频端口，因此目标小区的CSI-RS是目标小区和协作小区发送的。联合发送所使用的时频资源是一样的，均是目标小区的时频资源位置指示的时频资源，换言之，目标小区的CSI-RS是目标小区和协作小区联合下发的，实现目标小区和协作小区的相干联合发射，以使得终端测量得到的目标小区的CSI更加准确，进而使得目标小区在发送下行数据时可以获得更大的增益，提高终端的下行数据信号强度。
结合本申请的第一方面，在本申请的第一方面的第一种实现方式中，第一基站确定目标时频资源包括：
在第一基站获取目标小区的小区标识的情况下，第一基站根据上述小区标识确定目标小区的CSI-RS配置索引，CSI-RS配置索引指示了发射CSI-RS使用的时频资源位置；
其中，在第一基站根据目标小区的小区标识确定目标小区的CSI-RS配置索引之后，所述方法还包括：
第一基站向终端发送CSI-RS配置信息，该CSI-RS配置信息用于将终端的非零传输功率CSI-RS配置索引配置为目标小区的CSI-RS配置索引，以及将终端的零传输功率CSI-RS配置索引配置为包括以下CSI-RS的资源元素(resource element，RE)的索引：1、终端的非零功率CSI-RS的RE，2、目标小区作为其他目标小区协作小区，与其他目标小区联合下发的CSI-RS的RE，3、协作小区为其他目标小区联合下发的CSI-RS的RE。
可选的，第一基站配置终端的非零传输功率CSI-RS端口总数与目标导频端口的端口总数相等，例如若目标导频端口的端口总数为8个，终端的非零传输功率CSI-RS端口总数也为8个。
在上述第一种可能的实现方式中，通过上述对终端的CSI-RS配置一方面可以使得终端对根据目标小区的CSI-RS进行目标小区的信道估计，另一方面，当目标小区和协作小区更新时，无需对终端的CSI-RS配置进行重新配置，提高更新效率。
结合本申请的第一方面或第一方面的第一种可能的实现方式，在第一方面的第二种可能的实现方式中，协作小区为第一基站覆盖下的小区；目标导频端口的总数为S个，其中目标小区的导频端口的数目为A个，协作小区的导频端口的数目为(S-A)个，S为不小于2的正整数，A为不小于1且小于S的正整数；
第一基站根据目标时频资源位置，在目标导频端口上，向终端发送目标小区的CSI-RS，包括：
第一终端根据时频资源位置指示的时频资源，在目标小区的A个导频端口和协作小区 的(S-A)个导频端口上，向终端发送目标小区的CSI-RS。
结合本申请的第一方面或第一方面的第一种可能的实现方式，在第一方面的第三种可能的实现方式中，协作小区为第二基站覆盖下的小区，第二基站为覆盖与第一基站的覆盖范围有交叠的基站；目标导频端口的总数为S个，其中，协作小区的导频端口的数目为(S-A)个，S为不小于2的正整数，A为不小于1且小于S的正整数；
在第一基站根据目标时频资源位置，在目标导频端口上，向终端发送目标小区的CSI-RS之前，方法还包括：
第一基站向第二基站发送第一通知消息，第一通知消息中携带有协作小区的小区标识，以使得第二基站根据目标时频资源位置指示的时频资源，在协作小区的(S-A)个导频端口上，向终端发送目标小区的CSI-RS；
第一基站根据目标时频资源位置，在目标导频端口上，向终端发送目标小区的CSI-RS，包括：
当协作小区为第二基站内的小区时，第一基站根据目标时频资源位置指示的时频资源，在目标小区的A个导频端口上，向终端发送目标小区的CSI-RS。
结合本申请的第一方面的第二种可能的实现方式，在第一方面的第四种可能的实现方式中，在第一终端根据目标时频资源位置指示的时频资源，在目标小区的A个导频端口和协作小区的(S-A)个导频端口上，向终端发送目标小区的CSI-RS之后，所述方法还包括：
第一基站接收终端发送的目标小区的信道状态信息CSI；
第一基站根据目标小区的CSI，在S个数据端口上，向终端发送目标小区的下行数据信号，S个数据端口中的A个数据端口与目标小区的A个导频端口一一对应，S个数据端口中的(S-A)数据端口与协作小区的(S-A)个导频端口一一对应，其中，数据端口与导频端口对应相同的物理天线。
可选的，第一基站将目标小区的下行数据信号承载于PDSCH中，通过上述S个数据端口发送至终端，另外，第一基站还向终端下发PDCCH，以使得终端对PDSCH进行解调得到目标小区的下行数据。
结合本申请的第一方面的第三种可能的实现方式，在第一方面的第五种可能的实现方式中，在第一终端根据目标时频资源位置指示的时频资源，在目标小区的A个导频端口上，向终端发送目标小区的CSI-RS之后，所述方法还包括：
第一基站接收终端发送的目标小区的信道状态信息CSI；
第一基站向第二基站发送第二通知消息，第二通知消息中携带有目标小区的CSI和目标小区的下行数据信号，以使得第二基站根据目标小区的CSI，在(S-A)数据端口上，向终端发送目标小区的下行数据信号，(S-A)数据端口与协作小区的(S-A)个导频端口一一对应；
第一基站根据目标小区的CSI，在A个数据端口上，向终端发送目标小区的下行数据信号，上述A个数据端口与目标小区的A个导频端口一一对应，其中，数据端口与导频端口对应相同的物理天线。
可选的，第一基站将目标小区的下行数据信号承载于PDSCH中，发送至终端，另外， 第一基站还向终端下发PDCCH，以使得终端对PDSCH进行解调得到目标小区的下行数据。
在上述两种实现方式中，通过目标小区和协作小区联合下发下行数据信号至可以使得到达终端的信号的相位是相同的，信号可以相互叠加，增大下行信号的信号强度，提高信号传输效率。
本申请的第二方面提供了一种信号发送方法，包括：
第二基站接收第一基站发送的第一通知消息，第一通知消息中携带有协作小区的小区标识，第一基站为覆盖范围与第二基站的覆盖范围有交叠的基站；
第二基站根据协作小区的小区标识，确定目标时频资源位置和协作小区的导频端口，目标时频资源位置为目标小区的信道状态信息参考信号CSI-RS的时频资源位置，目标小区为第一基站覆盖下的小区，协作小区的导频端口的数目为(S-A)个，S为不小于2的正整数，A为不小于1且小于S的正整数；
第二基站根据目标时频资源位置，在协作小区的(S-A)个导频端口上，向终端发送目标小区的CSI-RS，终端的信号强度低于预设门限。
从以下技术方案可以看出，本申请中的信号发送方法具有以下优点：
第二基站在协作小区的导频端口上，联合发送目标小区的CSI-RS，可以使得终端根据第一基站和第二基站联合下发的目标小区的CSI-RS，更加准确地测量得到目标小区的CSI，从而获得更大的发射增益，提高终端的下行数据信号强度。结合本申请的第二方面，本申请的第二方面的第一种实现方式中，在第二基站根据目标时频资源位置，在协作小区的(S-A)个导频端口上，向终端发送目标小区的CSI-RS之后，所述方法还包括：
第二基站接收第一基站发送的第二通知消息，第二通知消息中携带有目标小区的信道状态信息CSI和目标小区的下行数据信号；
第二基站根据目标小区的CSI，在(S-A)个数据端口上，向终端发送目标小区的下行数据信号，(S-A)个数据端口与所述协作小区的(S-A)个导频端口一一对应，其中，数据端口与导频端口对应相同的物理天线。
在上述下行数据信号发送方法，当第一基站和第二基站向终端发送的下行数据信号到达终端时，信号的相位是相同的，可以相互叠加，增大下行数据信号的信号强度，提高信号传输效率。
本申请的第三方面提供了一种信号发送方法，包括：
终端接收目标小区的信道状态信息参考信号CSI-RS，目标小区的CSI-RS由根据目标时频资源位置，在目标导频端口上发送的，目标时频资源位置为目标小区的CSI-RS的时频资源位置，目标导频端口为用于联合发送目标小区的CSI-RS的导频端口，目标导频端口包括目标小区和协作小区的导频端口，协作小区为与目标小区联合发送目标小区的CSI-RS的小区；
终端根据目标小区的CSI-RS进行信道测量得到目标小区的信道状态信息CSI；
终端向第一基站发送目标小区的CSI。
从以下技术方案可以看出，本申请中的信号发送方法具有以下优点：
目标小区的CSI-RS是目标小区和协作小区联合下发的，实现目标小区和协作小区的 相干联合发射，因此，终端测量得到的目标小区的CSI更加准确，进而使得目标小区在发送下行数据时可以获得更大的增益，提高终端的下行数据信号强度。
结合本申请的第三方面，在本申请第三方面的第一种可能的实现方式中，在终端接收目标小区的信道状态信息参考信号CSI-RS之前，方法还包括：
终端接收第一基站发送的CSI-RS配置信息，CSI-RS配置信息用于指示终端的非零功率信道状态信息参考信号CSI-RS配置索引为目标小区的CSI-RS配置索引，以及终端的零功率CSI-RS配置索引为包括以下CSI-RS的资源元素(resource element，RE)的索引：1、终端的非零功率CSI-RS的RE，2、目标小区作为其他目标小区协作小区，与其他目标小区联合下发的CSI-RS的RE，3、协作小区为其他目标小区联合下发的CSI-RS的RE，终端为信号质量强度低于预设门限的终端，目标小区的CSI-RS配置索引用于确定目标时频资源，以及目标小区的CSI-RS配置索引是根据目标小区的小区标识确定的。
在该种实现方式中，通过上述对终端的CSI-RS配置一方面可以使得终端对根据目标小区的CSI-RS进行目标小区的信道估计，另一方面，当目标小区和协作小区更新时，无需对终端的CSI-RS配置进行重新配置，提高更新效率。
第四方面，本申请实施例提供一种基站，该基站具有实现上述方法实施例中基站行为的功能。该功能可以通过硬件实现，也可以通过硬件执行相应的软件实现。该硬件或软件包括一个或多个与上述功能相对应的模块。
第五方面，本申请实施例提供一种基站，包括：处理器、存储器、总线、发射器和接收器；该存储器用于存储计算机执行指令，该处理器与该存储器通过该总线连接，当该基站运行时，该处理器执行该存储器存储的该计算机执行指令，以使该基站执行如上述第一方面任意一项的信号发送方法。
第六方面，本申请实施例提供了一种计算机可读存储介质，用于储存为上述基站所用的计算机软件指令，当其在计算机上运行时，使得计算机可以执行上述第一方面中任意一项的信号发送方法。
第七方面，本申请实施例提供了一种包含指令的计算机程序产品，当其在计算机上运行时，使得计算机可以执行上述第一方面中任意一项的信号发送方法。
另外，第四方面至第七方面中任一种设计方式所带来的技术效果可参见第一方面中不同设计方式所带来的技术效果，此处不再赘述。
第八方面，本申请实施例提供一种基站，该基站具有实现上述方法实施例中基站行为的功能。该功能可以通过硬件实现，也可以通过硬件执行相应的软件实现。该硬件或软件包括一个或多个与上述功能相对应的模块。
第九方面，本申请实施例提供一种基站，包括：处理器、存储器、总线、发射器和接收器；该存储器用于存储计算机执行指令，该处理器与该存储器通过该总线连接，当该基站运行时，该处理器执行该存储器存储的该计算机执行指令，以使该基站执行如上述第二方面任意一项的信号发送方法。
第十方面，本申请实施例提供了一种计算机可读存储介质，用于储存为上述基站所用的计算机软件指令，当其在计算机上运行时，使得计算机可以执行上述第二方面中任意一 项的信号发送方法。
第十一方面，本申请实施例提供了一种包含指令的计算机程序产品，当其在计算机上运行时，使得计算机可以执行上述第二方面中任意一项的信号发送方法。
另外，第八方面至第十一方面中任一种设计方式所带来的技术效果可参见第二方面中不同设计方式所带来的技术效果，此处不再赘述。
第十二方面，本申请实施例提供一种终端，该终端具有实现上述方法实施例中终端行为的功能。该功能可以通过硬件实现，也可以通过硬件执行相应的软件实现。该硬件或软件包括一个或多个与上述功能相对应的模块。
第十三方面，本申请实施例提供一种终端，包括：处理器、存储器、总线、发射器和接收器；该存储器用于存储计算机执行指令，该处理器与该存储器通过该总线连接，当该终端运行时，该处理器执行该存储器存储的该计算机执行指令，以使该终端执行如上述第三方面任意一项的信号发送方法。
第十四方面，本申请实施例提供了一种计算机可读存储介质，用于储存为上述终端所用的计算机软件指令，当其在计算机上运行时，使得计算机可以执行上述第三方面中任意一项的信号发送方法。
第十五方面，本申请实施例提供了一种包含指令的计算机程序产品，当其在计算机上运行时，使得计算机可以执行上述第三方面中任意一项的信号发送方法。
另外，第十二方面至第十五方面中任一种设计方式所带来的技术效果可参见第三方面中不同设计方式所带来的技术效果，此处不再赘述。
第十六方面，本申请实施例提供了一种通信装置，通信装置包括处理元件和存储元件，其中存储元件用于存储计算机程序，当处理元件调用上述计算机程序时，通信装置用于执行上第一方面、第二方面和第三方面中任意一项所述的信号发送方法。
附图说明
图1(a)为本申请实施例中信号发送方法的一个系统框架示意图；
图1(b)为本申请实施例中信号发送方法的另一个系统框架示意图；
图2为本申请实施例中信号发送方法的一个实施例示意图；
图3(a)为本申请实施例中信号发送方法的另一个实施例示意图；
图3(b)为本申请实施例中信号发送方法的一个应用场景实示意图；
图4(a)为本申请实施例中信号发送方法的另一个实施例示意图；
图4(b)为本申请实施例中信号发送方法的另一个应用场景实示意图
图5为本申请实施例中第一基站的一个实施例示意图；
图6为本申请实施例中第一基站的另一个实施例示意图；
图7为本申请实施例中第二基站的一个实施例示意图；
图8为本申请实施例中终端的一个实施例示意图；
图9为本申请实施例中第一基站的一个硬件结构示意图；
图10为本申请实施例中第二基站的一个硬件结构示意图；
图11为本申请实施例中终端的一个硬件结构示意图。
具体实施方式
本申请提供了一种信号发送方法及相关设备，可以实现小区之间的相干联合发送，提高终端设备的下行数据信号强度。下面将结合本申请中的附图，对本申请中的技术方案进行清楚、完整地描述，显然，所描述的实施例仅仅是本申请一部分实施例，而不是全部的实施例。
本申请的说明书和权利要求书及上述附图中的术语“第一”、“第二”、“第三”、“第四”等(如果存在)是用于区别类似的对象，而不必用于描述特定的顺序或先后次序。应该理解这样使用的数据在适当情况下可以互换，以便这里描述的实施例能够以除了在这里图示或描述的内容以外的顺序实施。此外，术语“包括”和“具有”以及他们的任何变形，意图在于覆盖不排他的包含，例如，包含了一系列步骤或单元的过程、方法、系统、产品或设备不必限于清楚地列出的那些步骤或单元，而是可包括没有清楚地列出的或对于这些过程、方法、产品或设备固有的其它步骤或单元。
本申请中的信号发送方法用于无线通信系统，例如：全球移动通信(global system of mobile communication，GSM)系统，码分多址(code division multiple access，CDMA)系统，宽带码分多址(wideband code division multiple access wireless，WCDMA)系统，通用分组无线业务(general packet radio service，GPRS)系统，通用移动通信系统(universal mobile telecommunications system，UMTS)，LTE系统及其后续演进系统，如新一代无线通信系统(new generation，NR)。
本申请中，基站可以是长期演进(long term evolution，LTE)系统或者授权辅助接入长期演进(authorized auxiliary access long-term evolution，LAA-LTE)系统中的演进型基站(evolutional Node B，简称可以为eNB或e-NodeB)宏基站、微基站(也称为“小基站”)、微微基站、接入站点(access point，AP)或传输站点(transmission point，TP)，或gNodeB(new generation Node B，新一代基站)等。
本申请中提到的小区可以是基站对应的小区，小区可以属于宏基站，也可以属于小小区(small cell)对应的小基站或微基站，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。
终端是指终端设备，也可称之为用户设备(user equipment，UE)、移动台(mobile station，MS)、移动终端(mobile terminal)智能终端等，该终端可以经无线接入网(radio access network，RAN)与一个或多个核心网进行通信。例如，终端可以是移动电话(或称为“蜂窝”电话)、具有移动终端的计算机等，终端还可以是便携式、袖珍式、手持式、计算机内置的或者车载的移动装置以及未来5G网络中的终端，它们与无线接入网交换语音或数据。对终端的说明：本发明中，终端还可以包括中继Relay，和基站可以进行数据通信的都可以看为终端。如图1(a)所示为本申请中信号发送方法的一个系统框架示意图，包括：第一基站、第二基站和终端。
图1(a)示出了本申请信号发送方法的一个应用场景，如图所示，终端接入的目标小区在第一基站的覆盖范围下，目标小区的协作小区在第二基站的覆盖范围下，第一基站与 第二基站的覆盖范围有交叠，而典型的信号强度弱的覆盖区域是第一基站和第二基站的交叠覆盖区域，可以是基于以下两个方面的因素导致：一、基站的覆盖区域由基站中心向外辐射的，因此基站之间的交叠覆盖区域距离基站较远；二、交叠覆盖区域同时被两个甚至多个基站所覆盖，基站之间的信号会相互干扰导致信号强度弱。为了增强上述交叠覆盖区域范围内的终端的信号强度，第一基站和终端进行数据传输时，第一基站和第二基站进行协作联合发送信道状态信息参考信号，并有终端测量反馈信道状态信息至第一基站，以便进行第一基站和第二基站之间的联合发送下数据信息，具体发送示意图如图1(b)所示，第一基站向终端发送下行控制信息和下行数据信息，第二基站向终端发送下行数据信息。
此外，上述图1(a)和图1(b)示出的信号强度弱的终端位于第一基站和第二基站的交叠服务区域范围内的情况。终端还可以位于其他信号强度较弱的位置，比如说同一个基站覆盖范围下的两个小区之间的边缘区域。本申请中协作小区可以是一个或多个小区，终端均在上述一个或多个小区的覆盖范围内。
为了便于理解本申请实施例中的信号发送方法，本申请中的信号发送方法可以理解为是一种基站小区之间协同发送下行数据信号的方法，其目的在于提高信号强度较弱的终端信号强度，以下实施例中简称终端，下面结合具体的实施例对本申请中的信号发送方法进行详细说明：
本申请中目标小区是终端的服务小区，终端是在目标小区信号覆盖范围内信号强度较弱的终端，为了提高终端的信号强度，目标小区和协作小区进行联合发送以终端的接收信号强度。
如图2所示，本申请实施例中信号发送方法的一个实施例，包括：
201、第一基站确定目标导频端口和目标小区的协作小区，其中，目标导频端口包括目标小区和协作小区的导频端口。
目标小区是为终端提供服务的服务小区，协作小区是与目标小区向终端进行联合发送的小区。第一基站可以通过周期性地手机第一基站或其他基站接收到的A3测量报告的信息，并选择发送A3测量报告次数较多的一个或多个小区作为协作小区。
202、第一基站确定目标时频资源的资源位置。
可选的，第一基站先获取到目标小区的小区标识，进而，第一基站根据目标小区的小区标识确定目标小区的CSI-RS配置索引，最终，第一基站根据目标小区的CSI-RS配置索引确定目标时频资源的资源位置，以确定目标时频资源。
在上述可选的第一基站确定目标时频资源的实现方式中，在第一基站根据目标小区的小区标识确定目标小区的CSI-RS配置索引之后，第一基站还可以执行如下操作：
第一基站向终端发送发送CSI-RS配置信息，CSI-RS配置信息用于指示终端的非零功率CSI-RS配置索引为目标小区的CSI-RS配置索引，以及终端的零功率CSI-RS配置索引为包括以下三类CSI-RS资源元素RE的索引：终端的非零功率CSI-RS的RE、目标小区为其他目标小区联合下发的CSI-RS的RE和协作小区为其他目标小区联合下发的CSI-RS的RE。
通过上述配置方式，对终端的非零功率CSI-RS配置索引和零功率CSI-RS配置索引进行配置，其中，第一基站将终端的非零功率CSI-RS配置索引配置为目标小区的CSI-RS配 置索引，可以使得终端仅仅对承载于目标时频资源上的CSI-RS信号进行信道估计。同时，第一基站将终端的零功率CSI-RS配置索引配置为如上三类索引，可以使得当目标小区发送更新，如更新为上述其他目标小区时无需对终端的非零功率CSI-RS配置索引进行重新配置，提高更新效率。
203、第一基站根据目标时频资源，在目标导频端口上向终端发送目标小区的CSI-RS。
第一基站将目标小区的CSI-RS承载于目标时频资源上，并通过目标导频端口将目标小区的CSI-RS发送至终端，其中，终端是信号质量强度低于预设阈值的终端。
在上述步骤201中确定的协作小区可以是在第一基站覆盖下的小区，如目标小区的邻区，也可以是第二基站覆盖下的小区。目标导频端口中既包括目标小区的导频端口，又包括协作小区的导频端口。因此，容易知道，当协作小区在第一基站覆盖下时，第一基站既可以通过目标小区的导频端口发送信号，也可以通过协作小区的导频端口发送信号。而当自作小区在第二基站覆盖下时，第一基站无法通过协作小区的导频端口发送信号，此时便需要第二基站协作第一基站进行联合发送。
上述两种情况的具体实施方式详见下面图3(a)和图4(a)对应的实施例的相关描述，此处不再赘述。
本实施例中，由于目标导频端口中既有目标小区的导频端口，又有协作小区的导频端口，因此目标小区的CSI-RS是目标小区和协作小区联合发送的，并且联合发送所使用的时频资源的资源位置是一样的，均是目标小区对应的目标时频资源的资源位置。容易理解，对于终端而言，其接收到的目标小区的CSI-RS是目标小区的CSI-RS是目标小区和协作小区使用相同的时频资源联合下发(即相干联合发射)的，因此，本实施例中的信号发送方法可以实现目标小区和协作小区的相干联合发射，以使得终端接收到的两路信号(即目标小区和协作小区对应的信号)的相位可以相互叠加，增大终端接收CSI-RS的信号强度，以使得终端测量得到的目标小区的CSI更加准确，进而使得目标小区在发送下行数据时可以获得更大的增益，提高终端的下行数据信号强度。
下面将结合协作小区与目标小区同属于相同基站覆盖下，和协作小区和目标小区属于不同基站覆盖下两种情况对本申请中的信号发送方法进行详细说明，具体如下：
一、目标小区在第一基站的覆盖范围内，协作小区在第二基站的覆盖范围内；
如图3(a)所示，本申请实施例中信号发送方法的的另一个实施例，包括：
301、第一基站确定目标导频端口和目标小区的协作小区。
第一基站确定用于目标小区和协作小区进行联合发送的目标导频端口，该目标导频端口包括目标小区的导频端口和协作小区的导频端口，目标小区为在第一基站覆盖下的小区；
第一基站确定目标小区的协作小区，具体确定方式为：第一基站确定与其覆盖范围有交叠的第二基站，第一基站周期性地收集第二基站的A3测量报告，并将第二基站覆盖下、A3测量报告次数较多的一个或多个小区作为协作小区。
上述目标导频端口的总数为S个，其中包括目标小区的A个导频端口和协作小区的(S-A)个导频端口，其中，S为不小于2的正整数，典型值为8、16或32，A为不小于1 且小于S的正整数；
302、第一基站确定目标时频资源位置。
第一基站确定目标时频资源，目标时频资源为目标小区对应的用于联合发送目标小区的信道状态信息参考信号CSI-RS的时频资源，也称为目标小区的时频资源。
可选的，第一基站根据目标小区的小区标识确定目标小区的信道状态信息参考信号配置索引CSI-RS configuration index，CSI-RS configuration index用于确定CSI-RS发射的频域/时域位置，目标小区的CSI-RS configuration index的具体确定方式可以采用(CellID mod N)作为索引一一确定CSI-RS configuration index，其中，N为一个整数，典型值为3或6，目标小区的CSI-RS configuration index也可以采用固定值作为索引。
可选的，在上述确定目标小区的CSI-RS configuration index之后，第一基站配置终端的CSI-RS，第一基站向终端发送CSI-RS配置信息，对终端进行如下配置：一、将终端的非零功率(non-zeros power，NZP)CSI-RS configuration index配置为目标小区的CSI-RS configuration index，二、将终端的non-zeros power CSI-RS端口数量配置为S个，即为目标小区和协作小区的导频端口总数，三、将终端的零功率(zeros power，ZP)CSI-RS configuration index配置为覆盖如下CSI-RS资源元素(resource element，RE)的index：1、终端的非零功率CSI-RS的RE，2、目标小区作为其他目标小区协作小区，与其他目标小区联合下发的CSI-RS的RE，3、协作小区为其他目标小区联合下发的CSI-RS的RE。
303、第一基站向第二基站发送第一通知消息。
在确定目标小区的时频资源位置之后，第一基站向第二基站发送第一通知消息，第一消息中携带有协作小区的小区标识，以使得第二基站根据目标小区的时频资源位置指示的时频资源，在协作小区的(S-A)个导频端口上向终端发送目标小区的CSI-RS。
304、第一基站根据目标时频资源位置，在目标小区的导频端口上，向终端发送目标小区的信道状态信息参考信号。
第一基站在目标小区的A个导频端口上，向终端发送目标小区的CSI-RS configuration index的CSI-RS，即目标小区的CSI-RS，目标时频资源位置由目标小区的CSI-RS configuration index指示得到。
可选的，在步骤304之前，还包括：第一基站确定终端，具体确定方法可以为，第一基站选择第一基站的目标小区和第二基站的协作小区交叠服务区域内的终端作为终端，容易知道，当终端的当前服务小区的信号强度下降到一定阈值时，终端主动向基站发送A3测量报告，因此，A3测量可以作为基站选择信号质量差的终端的一个依据。
305、第二基站根据目标时频资源位置，在协作小区的导频端口上，向终端发送目标小区的信道状态信息参考信号。
第二基站在协作小区的(S-A)个导频端口上，向终端发送与目标小区的CSI-RS configuration index的CSI-RS，即目标小区的CSI-RS，目标时频资源位置由目标小区的CSI-RS configuration index指示得到。
举例说明，目标导频端口的总数(S＝8)，端口号依次为0至7，当两两小区之间进行 联合发送即协作小区的数量为一个时，第一基站在端口号为0至3的导频端口上向终端发送目标小区的CSI-RS，第二基站在端口号为4至7的导频端口上向终端发送目标小区的CSI-RS；
当对个小区之间进行联合发送即协作小区的数量为至少两个时，以两个协作小区(协作小区1和协作小区2)为例，第一基站仍在端口号为0至3的导频端口上向终端发送目标小区的CSI-RS，第二基站在端口号为4至7的导频端口上向终端发送目标小区的CSI-RS，其中，端口号为4和5的导频端口与协作小区1对应，端口号为6和7的导频端口与协作小区2对应。
306、终端根据目标小区的信道状态信息参考信号进行信道测量得到目标小区的信道状态信息。
终端根据接收到的目标小区的CSI-RS，进行信道测量得到目标小区的信道状态信息CSI，其中CSI包括信道质量指示(channel quality indication，CQI)、信道秩(rank indication，RI)和预编码码本信息(precoding matrix indication，PMI)，其中，CQI:在LTE中为固定的表格，一般SINR越高，CQI阶数越高，用户速率越大；PMI:终端测量信道进行计算得出，反馈给基站，基站采用该PMI进行发射预编码，更好的匹配信道，获得预编码增益；RI：表示信道能够支持的复用的流数。
可选的，第一基站将终端的传输模式配置为TM9，由于终端测量到的PMI的端口数与配置给该终端的NZP CSI-RS端口数相同，并且PMI会加权到TM9的PDSCH上，因此，PDSCH的端口数与配置给终端的NZP CSI-RS端口数相同。
307、终端向第一基站发送目标小区的信道状态信息。
终端向第一基站上报目标小区的CSI，其中CSI包括CQI、PMI和RI。
308、第一基站根据目标小区的信道状态信息向第二基站发送第二通知消息。
第一基站根据终端反馈的CQI、PMI和RI，确定发送给终端的PDSCH信道的调制与编码策略(modulation and coding scheme，MCS)、RANK和PMI，第一基站将携带有上述MCS、RANK、PMI和下行数据信息的第二通知消息发送给第二基站。
309、第一基站根据目标小区的信道状态信息向终端发送目标小区的下行数据信号。
第一基站根据终端反馈的CQI、PMI和RI，确定发送给终端的PDSCH信道的MCS、RANK和PMI，在A个数据端口上，向终端发送承载有下行数据信息的PDSCH信道，其中，A个数据端口与目标小区的A个导频端口一一对应，并且数据端口与导频端口对应相同的物理天线。
可选的，上述PDSCH信道的传输模式为TM9，从上述步骤306的描述可知，发送TM9的PDSCH的端口数与配置给终端的NZP CSI-RS端口数相同，从上述步骤步骤302可知：配置给终端的NZP CSI-RS端口数与目标导频端口数相同为S个，因此，第一基站在目标小区的A个导频端口上向终端发送TM9的PDSCH。
可选的，第一基站向终端发送上述TM9的PDSCH对应的PDCCH，该PDCCH用于承载辅助解调上述下行数据信息的下行控制信息。
310、第二基站目标小区的信道状态信息参考信号向终端发送目标小区的下行数据信 号。
在第二基站接收到第一基站发送的第二通知消息之后，第二基站根据第二通知消息中携带的MCS、RANK和PMI生成PDSCH信道，将上述下行数据信息承载与上述PDSCH信道上并在(S-A)数据端口上，向终端发送上述PDSCH信道，其中，导频端口与数据端口对应相同的物理天线。
可选的，与上述步骤309的关于TM9部分的描述类似，第二基站在协作小区的(S-A)个导频端口上向终端发送TM9的PDSCH。
对于上述步骤309和步骤310中第一基站和第二基站向终端发送目标小区的下行控制信息的发送方式，与上述步骤305中对发送目标小区的CSI-RS的发送方式类似，可参见上述步骤305中的相关描述，对此此处不再赘述。
本实施例中，第一基站和第二基站根据相同的CSI-RS configuration index的指示，分别在目标小区和协作小区的导频端口上向终端发送CSI-RS，实现目标小区和协作小区通过联合信道进行发送，从而使得目标终测量到更准确的信道状态信息，获得更大的相干发送增益，根据上述联合信道发送的CSI-RS反馈得到的发射权值PMI加权到TM9的PDSCH信道上，可以使得第一基站和第二基站发送的PDSCH到达终端时，其PDSCH是同相位的，因此可以相位叠加增强信号强度，从而提高终端接收信号的信号强度。
为了便于理解本申请实施例中的信号发送方法，下面结合具体的应用场景进行详细说明：
应用场景一：如图3(b)所示，小明使用手机与他人进行通话，通话开始时，小明位于第一基站的服务范围内打电话，手机与第一基站之间进行语音业务，小明一边打电话一边朝图中箭头方向移动，当小明移动到图中第一基站与第二基站的交叠服务区域内时，由于受到第二基站的向干扰，以及远离第一基站导致手机信号强度弱，手机开始测量周围第二基站的信号强度较强，并向第一基站发送A3测量报告请求切换，此时第一基站将手机确定为终端，第一基站向第二基站发送通知消息，通知第二基站协助第一基站向小明的手机发送语音信号，第一基站与第二基站完成联合发送的信息交互之后，第一基站联合第二基站向小明的手机发送语音信号，以增强小明的手机信号强度，保证正常通话。
二、目标小区和协作小区均在第一基站的覆盖范围内；
如图4(a)所示，本申请实施例中信号发送方法的另一个实施例包括：
401、第一基站确定目标导频端口和目标小区的协作小区。
第一基站确定用于目标小区和协作小区进行联合发送的目标导频端口，该目标导频端口包括目标小区的导频端口和协作小区的导频端口，目标小区为在第一基站覆盖下的小区；
第一基站将目标小区的一个或多个相邻小区作为协作小区，例如，对于一个基站的三个相邻扇区可以固定互为协作小区。
402、第一基站确定目标时频资源位置。
步骤402与上述步骤302类似，详细描述可参阅上述步骤302对此，此处不再赘述。
403、第一基站根据目标时频资源位置，在目标小区和协作小区的导频端口上，向终 端发送目标小区的信道状态信息参考信号。
第一基站在目标小区的A个导频端口和协作小区的(S-A)个导频端口上，向终端发送目标小区的CSI-RS configuration index的CSI-RS，即目标小区的CSI-RS，目标时频资源位置由目标小区的CSI-RS configuration index指示得到。
步骤403的其余相关描述与上述步骤304与步骤305中的相关描述类似，详细描述可参阅上述步骤304和305的相关描述，此处将不再赘述。
可选的，在上述步骤403之前，还包括：第一基站将目标小区和协作小区边缘位置上信号强度较弱的终端作为终端，其具体确定方法同样可以依据终端上报至基站的A3测量报告，详细描述参见上述步骤304中关于A3测量的相关描述，此处不再赘述。
404、终端根据目标小区的信道状态信息参考信号进行信道测量得到目标小区的信道状态信息。
405、终端向第一基站发送目标小区的信道状态信息。
步骤404和步骤405分别与上述步骤306和步骤307类似，详细描述可参阅上述步骤306和307的相关描述，此处将不再赘述。
406、第一基站根据目标小区的信道状态信息向终端发送目标小区的下行数据信号。
步骤406与上述步骤309和310中的相关描述类似，不同点在于，由于协作小区和目标小区同在第一基站的覆盖范围下，因此，该步骤406中的第一基站既要执行上述步骤309第一基站的操作，也要执行上述步骤310中第二基站执行的操作，其余部分相关描述可参阅上述步骤309和310，对此此处不再赘述。
本申请实施例中，目标小区和协作小区在同一基站的覆盖下，通过上述目标小区和协作小区的联合相干发送，可以使得通过目标小区的导频端口和协作小区的导频端口发送的PDSCH到达终端时，其PDSCH可以同相位叠加，提高终端接收信号的信号强度，提高下行数据的传输效率。为了便于理解本申请实施例中的信号发送方法，下面结合具体的应用场景进行详细说明：
应用场景二：如图4(b)所示，小区1、小区2和小区3为在基站覆盖下的三个相邻小区，上述三个小区互为协作小区。小明使用手机与他人进行通话，通话开始时，小明位于基站的服务小区1的服务范围内，服务小区1与手机之间进行语音传输，小明一边打电话一边朝图中箭头方向朝着小区3和小区1的边缘服务区域移动，最后站在箭头尾部的位置继续打电话，由于小明停驻的位置远离基站中心，信号强度弱，此时，小区1通知小区3对小明的手机进行联合发送，进而，小区1联合小区3向小明的手机进行联合发送语音信号，以增强小明的手机信号强度，保证正常通话。
上述实施例从协作小区与目标小区的基站覆盖不同对本申请中信号发送方法进行了详细说明，下面将对本申请中的第一基站、第二基站和终端进行详细说明，具体如下：
一、第一基站
如图5所示，本申请实施例中的第一基站50包括：
处理模块501，用于确定目标导频端口和目标小区的协作小区，协作小区为与目标小区联合发送目标小区的信道状态信息参考信号CSI-RS的小区，目标导频端口为用于联合发 送目标小区的CSI-RS的导频端口，目标导频端口包括目标小区和协作小区的导频端口；
处理模块501，还用于确定目标时频资源的资源位置，目标时频资源为用于发送目标小区的CSI-RS的时频资源；
发送模块502，用于根据目标时频资源，在目标导频端口上，向终端发送目标小区的CSI-RS，终端的信号强度低于预设门限值。
处理模块501具体用于：
根据目标小区的小区标识确定目标小区的CSI-RS配置索引；
根据目标小区的CSI-RS配置索引确定目标时频资源的资源位置；
发送模块502，还用于：
向终端发送CSI-RS配置信息，CSI-RS配置信息用于指示终端的非零功率CSI-RS配置索引为目标小区的CSI-RS配置索引，以及终端的零功率CSI-RS配置索引为包括以下三类CSI-RS资源元素RE的索引：终端的非零功率CSI-RS的RE、目标小区为其他目标小区联合下发的CSI-RS的RE和协作小区为其他目标小区联合下发的CSI-RS的RE。
如图6所示，在一种示例中，协作小区为第一基站覆盖下的小区；目标导频端口的总数为S个，其中目标小区的导频端口的数目为A个，协作小区的导频端口的数目为(S-A)个，S为不小于2的正整数，A为不小于1且小于S的正整数；
处理模块601具体用于：
根据目标时频资源，在目标小区的A个导频端口和协作小区的(S-A)个导频端口上，向终端发送目标小区的CSI-RS。
基于上上述协作小区为第一基站覆盖下的小区的示例，在另一种示例中，如图6所示，第一基站60还包括：
接收模块603，用于接收终端发送的目标小区的信道状态信息CSI；
发送模块602还用于：
根据目标小区的CSI，在S个数据端口上，向终端发送目标小区的下行数据信号，S个数据端口中的A个数据端口与目标小区的A个导频端口一一对应，S个数据端口中的(S-A)数据端口与协作小区的(S-A)个导频端口一一对应。
如图6所示，在另一种示例中，协作小区为第二基站覆盖下的小区，第二基站为覆盖与第一基站的覆盖范围有交叠的基站；目标导频端口的总数为S个，其中，协作小区的导频端口的数目为(S-A)个，S为不小于2的正整数，A为不小于1且小于S的正整数；
发送模块602还用于：
向第二基站发送第一通知消息，第一通知消息中携带有协作小区的小区标识；
处理模块601具体用于：
根据目标时频资源，在目标小区的A个导频端口上，向终端发送目标小区的CSI-RS。
基于上述协作小区为第二基站覆盖下的小区的示例，在又一种示例中，第一基站60还包括：
接收模块603，用于接收终端发送的目标小区的CSI；
发送模块602还用于：
向第二基站发送第二通知消息，第二通知消息中携带有目标小区的CSI和目标小区的下行数据信号，以使得第二基站根据目标小区的CSI，在(S-A)数据端口上，向终端发送目标小区的下行数据信号，(S-A)数据端口与协作小区的(S-A)个导频端口一一对应；
根据目标小区的CSI，在A个数据端口上，向终端发送目标小区的下行数据信号，A个数据端口与目标小区的A个导频端口一一对应。
需要说明的是，上述第一基站分别使用了50和60的标号，仅仅只是为了区分是图5中所示的还是图6中所示的需要，除此之外，无其他差异。在第二基站和终端对应的实施例中均采用50以标识第一基站，下文不再赘述。
上述处理模块501(或601)具体可以是图9中所示的处理器901，发送模块502(或602)和接收模块603具体可以是图9中所示的收发器902。
本实施例中，关于第一基站的其他相关描述以及有益效果可参阅上述图3(a)以及图4(a)中对应的实施例中，关于第一基站的相关描述，此处不再赘述。
二、第二基站
如图7所示，本申请实施例中第二基站70包括：
接收模块701，用于接收第一基站发送的第一通知消息，第一通知消息中携带有协作小区的小区标识，第一基站为覆盖范围与第二基站的覆盖范围有交叠的基站；
处理模块702，用于根据协作小区的小区标识，确定目标时频资源的资源位置和协作小区的导频端口，目标时频资源为用于发送目标小区的信道状态信息参考信号CSI-RS的时频资源，目标小区为第一基站覆盖下的小区，协作小区的导频端口的数目为(S-A)个，S为不小于2的正整数，A为不小于1且小于S的正整数；
发送模块703，用于根据目标时频资源，在协作小区的(S-A)个导频端口上，向终端发送目标小区的CSI-RS，终端的信号强度低于预设门限。
在一种示例中，接收模块701还用于：
接收第一基站发送的第二通知消息，第二通知消息中携带有目标小区的信道状态信息CSI和目标小区的下行数据信号；
发送模块还用于：
根据目标小区的CSI，在(S-A)个数据端口上，向终端发送目标小区的下行数据信号，(S-A)个数据端口与协作小区的(S-A)个导频端口一一对应。
上述处理模块702具体可以是图10中所示的处理器1001，上述接收模块701和发送模块703具体可以是图10中所示的收发器1002。
本实施例中，关于第二基站的其他相关描述以及有益效果可参阅上述图3(a)以及图4(a)中对应的实施例中，关于第二基站的相关描述，此处不再赘述。
三、终端
如图8所示，本申请实施例中终端80包括：
接收模块801，用于接收目标小区的信道状态信息参考信号CSI-RS，目标小区的CSI-RS承载于目标时频资源上并通过目标导频端口发送至终端，目标导频端口包括目标小区和协作小区的导频端口，协作小区为与目标小区联合发送目标小区的CSI-RS的小区，终端的信 号质量强度低于预设门限；
处理模块802，用于根据目标小区的CSI-RS获取目标小区的信道状态信息CSI；
发送模块803，用于向第一基站发送目标小区的CSI。
在一种示例中，接收模块801还用于：
接收第一基站发送的CSI-RS配置信息，CSI-RS配置信息用于指示终端的非零功率信道状态信息参考信号CSI-RS配置索引为目标小区的CSI-RS配置索引，以及终端的零功率CSI-RS配置索引为包括以下三类CSI-RS资源元素RE的索引：终端的非零功率CSI-RS的RE、目标小区为其他目标小区联合下发的CSI-RS的RE和协作小区为其他目标小区联合下发的CSI-RS的RE，目标小区的CSI-RS配置索引用于确定目标时频资源，以及目标小区的CSI-RS配置索引是根据目标小区的小区标识确定的。
上述处理模块802具体可以是下图11中所示的处理器111，上述接收模块801和发送模块803具体可以是下图11中所示的收发器112。
本实施例中，关于终端的其他相关描述以及有益效果可参阅上述图3(a)以及图4(a)中对应的实施例中，关于终端的相关描述，此处不再赘述。
下面结合第一基站、第二基站和终端的硬件结构分别对其进行详细说明，具体如下：
如图9所示，第一基站90包括：
收发器902、处理器901、存储器903和网络接口904；
第一基站90提供UE到网络的无线接入，包括一个或多个处理器901，一个或多个存储器902，一个或多个网络接口904，以及一个或多个收发器902(每个收发器包括接收机Rx和发射机Tx)，通过总线连接。一个或多个收发器902与天线或天线阵列连接。一个或多个处理器901包括计算机程序代码或计算机操作指令。网络接口904通过链路(例如与核心网之间的链路)与核心网设备91连接，或者通过有线或无线链路与其它基站(如第二基站10)进行连接。
本实施例中，处理器901通过调用上述存储器902中存储的计算机程序代码或计算机操作指令，执行上述图3(a)和图4(a)中第一基站的相关操作，详细描述可参阅上述图3(a)和图4(a)对应的实施例中第一基站的相关描述，此处再赘述。
网络还可以包括核心网络设备91，例如网络控制单元(network control equipment，NCE)、移动性管理实体(mobile managenment entity，MME)或信令网关(signaling gateway，SGW)，可以提供进一步网络连接，例如电话网络和/或数据通信网络(例如Internet)。第一基站90可以通过链路(例如S1接口)与核心网设备91连接。核心网设备91包括一个或多个处理器911，一个或多个存储器912，以及一个或多个网络接口913，通过总线进行连接。一个或多个存储器912包括计算机程序代码或计算机操作指令。
本申请实施例还提供了一种计算机存储介质，用于储存为上述终端所用的计算机软件指令，当其在计算机上运行时，使得计算机可以执行上述第一基站90所执行的信号发送方法。其中，该存储介质具体可以为上述存储器912。
本申请实施例还提供了一种包含指令的计算机程序产品，当其在计算机上运行时，使得计算机可以执行上述终端所执行的信号发送方法。
如图10所示，第二基站100包括：
收发器1002、处理器1001、存储器1003和网络接口1004；
第二基站100提供UE到网络的无线接入，包括一个或多个处理器1001，一个或多个存储器1002，一个或多个网络接口1004，以及一个或多个收发器1002(每个收发器包括接收机Rx和发射机Tx)，通过总线连接。一个或多个收发器1002与天线或天线阵列连接。一个或多个处理器1001包括计算机程序代码或计算机操作指令。网络接口1004通过链路(例如与核心网之间的链路)与核心网设备110连接，或者通过有线或无线链路与其它基站(如第一基站90)进行连接。
本实施例中，处理器101通过调用上述存储器1002中存储的计算机程序代码或计算机操作指令，执行图4(a)中第二基站的相关操作，详细描述可参阅上述图4(a)对应的实施例中第二基站的相关描述，此处再赘述。
网络还可以包括核心网络设备110，例如网络控制单元(network control equipment，NCE)、移动性管理实体(mobile managenment entity，MME)或信令网关(signaling gateway，SGW)，可以提供进一步网络连接，例如电话网络和/或数据通信网络(例如Internet)。第二基站100可以通过链路(例如S1接口)与核心网设备110连接。核心网设备110包括一个或多个处理器1101，一个或多个存储器1102，以及一个或多个网络接口1103，通过总线进行连接。一个或多个存储器1102包括计算机程序代码或计算机操作指令。
本申请实施例还提供了一种计算机存储介质，用于储存为上述终端所用的计算机软件指令，当其在计算机上运行时，使得计算机可以执行上述第二基站100所执行的信号发送方法。其中，该存储介质具体可以为上述存储器1002。
本申请实施例还提供了一种包含指令的计算机程序产品，当其在计算机上运行时，使得计算机可以执行上述终端所执行的信号发送方法。
如图11所示，终端11包括：
处理器111、收发器112和存储器113；
终端11称为UE11通过链路和基站进行无线通信。UE11包括一个或多个处理器111，一个或多个存储器113，一个或多个收发器112(每个收发器包括发射机Tx和接收机Rx)，通过总线相连接。一个或多个收发器112与一个或多个天线连接。一个或多个存储器113中包括计算机程序代码或计算机操作指令。
本实施例中，处理器901通过调用上述存储器902中存储的计算机程序代码或计算机操作指令，执行上述图3(a)和图4(a)中终端的相关操作，详细描述可参阅上述图3(a)和图4(a)对应的实施例中终端的相关描述，此处再赘述。
本申请实施例还提供了一种计算机存储介质，用于储存为上述终端所用的计算机软件指令，当其在计算机上运行时，使得计算机可以执行上述终端11所执行的信号发送方法。其中，该存储介质具体可以为上述存储器113。
本申请实施例还提供了一种包含指令的计算机程序产品，当其在计算机上运行时，使得计算机可以执行上述终端所执行的信号发送方法。
本申请实施例还提供了一种通信装置，通信装置包括：处理元件和存储元件，其中存储元件用于存储计算机程序，当处理元件调用上述计算机程序时，通信装置用于执行上述信号发送方法的实施例中终端、第一基站或第二基站所执行的操作。
基站可以是上述文中提及的任意一种基站，UE也可以是上文中提及的任意一种终端，对此此处不做任何限制。
UE、基站和核心网络设备中包括的存储器可以是适合任何本地技术环境的类型，并且可以使用任何适合的数据存储技术实现。
在上述实施例中，可以全部或部分地通过软件、硬件、固件或者其任意组合来实现。当使用软件实现时，可以全部或部分地以计算机程序产品的形式实现。所述计算机程序产品包括一个或多个计算机指令。在计算机上加载和执行所述计算机程序指令时，全部或部分地产生按照本申请所述的流程或功能。所述计算机可以是通用计算机、专用计算机、计算机网络、或者其他可编程装置。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储的任何可用介质或者是包含一个或多个可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(例如，DVD)、或者半导体介质(例如固态硬盘solid state disk(SSD))等。所属领域的技术人员可以清楚地了解到，为描述的方便和简洁，上述描述的系统，装置和单元的具体工作过程，可以参考前述方法实施例中的对应过程，在此不再赘述。
在本申请所提供的几个实施例中，应该理解到，所揭露的系统，装置和方法，可以通过其它的方式实现。例如，以上所描述的装置实施例仅仅是示意性的，例如，所述单元的划分，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，例如多个单元或组件可以结合或者可以集成到另一个系统，或一些特征可以忽略，或不执行。另一点，所显示或讨论的相互之间的耦合或直接耦合或通信连接可以是通过一些接口，装置或单元的间接耦合或通信连接，可以是电性，机械或其它的形式。
所述作为分离部件说明的单元可以是或者也可以不是物理上分开的，作为单元显示的部件可以是或者也可以不是物理单元，即可以位于一个地方，或者也可以分布到多个网络单元上。可以根据实际的需要选择其中的部分或者全部单元来实现本实施例方案的目的。
另外，在本申请各个实施例中的各功能单元可以集成在一个处理单元中，也可以是各个单元单独物理存在，也可以两个或两个以上单元集成在一个单元中。上述集成的单元既可以采用硬件的形式实现，也可以采用软件功能单元的形式实现。
所述集成的单元如果以软件功能单元的形式实现并作为独立的产品销售或使用时，可以存储在一个计算机可读取存储介质中。基于这样的理解，本申请的技术方案本质上或者说对现有技术做出贡献的部分或者该技术方案的全部或部分可以以软件产品的形式体现出来，该计算机软件产品存储在一个存储介质中，包括若干指令用以使得一台计算机设备 (可以是个人计算机，服务器，或者网络设备等)执行本申请各个实施例所述方法的全部或部分步骤。而前述的存储介质包括：U盘、移动硬盘、只读存储器(read-only memory，ROM)、随机存取存储器(random access memory，RAM)、磁碟或者光盘等各种可以存储程序代码的介质。
以上所述，以上实施例仅用以说明本申请的技术方案，而非对其限制；尽管参照前述实施例对本申请进行了详细的说明，本领域的普通技术人员应当理解：其依然可以对前述各实施例所记载的技术方案进行修改，或者对其中部分技术特征进行等同替换；而这些修改或者替换，并不使相应技术方案的本质脱离本申请各实施例技术方案范围。

Claims (20)

  1. 一种信号发送方法，其特征在于，包括：
    第一基站确定目标导频端口和目标小区的协作小区，所述协作小区为与所述目标小区联合发送所述目标小区的信道状态信息参考信号CSI-RS的小区，所述目标导频端口为用于联合发送所述目标小区的CSI-RS的导频端口，所述目标导频端口包括所述目标小区和所述协作小区的导频端口；
    所述第一基站确定目标时频资源的资源位置，所述目标时频资源为用于发送所述目标小区的CSI-RS的时频资源；
    所述第一基站根据所述目标时频资源，在所述目标导频端口上，向终端发送所述目标小区的CSI-RS，所述终端的信号强度低于预设门限值。
  2. 根据权利要求1所述的方法，其特征在于，所述第一基站确定所述目标时频资源的资源位置，具体包括：
    所述第一基站根据所述目标小区的小区标识确定所述目标小区的CSI-RS配置索引；
    所述第一基站根据所述目标小区的CSI-RS配置索引确定所述目标时频资源的资源位置；
    在所述第一基站根据所述目标小区的小区标识确定所述目标小区的CSI-RS配置索引之后，所述方法还包括：
    所述第一基站向所述终端发送CSI-RS配置信息，所述CSI-RS配置信息用于指示所述终端的非零功率CSI-RS配置索引为所述目标小区的CSI-RS配置索引，以及所述终端的零功率CSI-RS配置索引为包括以下三类CSI-RS资源元素RE的索引：所述终端的非零功率CSI-RS的RE、所述目标小区为其他目标小区联合下发的CSI-RS的RE和所述协作小区为其他目标小区联合下发的CSI-RS的RE。
  3. 根据权利要求1或2所述的方法，其特征在于，所述协作小区为所述第一基站覆盖下的小区；所述目标导频端口的总数为S个，其中所述目标小区的导频端口的数目为A个，所述协作小区的导频端口的数目为(S-A)个，S为不小于2的正整数，A为不小于1且小于S的正整数；
    所述第一基站根据所述目标时频资源，在所述目标导频端口上，向终端发送所述目标小区的CSI-RS，具体包括：
    所述第一基站根据所述目标时频资源，在所述目标小区的A个导频端口和所述协作小区的(S-A)个导频端口上，向所述终端发送所述目标小区的CSI-RS。
  4. 根据权利要求1或2所述的方法，其特征在于，所述协作小区为第二基站覆盖下的小区，所述第二基站为覆盖与所述第一基站的覆盖范围有交叠的基站；所述目标导频端口的总数为S个，其中，所述协作小区的导频端口的数目为(S-A)个，S为不小于2的正整数，A为不小于1且小于S的正整数；
    在所述第一基站根据所述目标时频资源，在所述目标导频端口上，向终端发送所述目标小区的CSI-RS之前，所述方法还包括：
    所述第一基站向所述第二基站发送第一通知消息，所述第一通知消息中携带有所述协 作小区的小区标识终端；
    所述第一基站根据所述目标时频资源，在所述目标导频端口上，向终端发送所述目标小区的CSI-RS，具体包括：
    所述第一基站根据所述目标时频资源，在所述目标小区的A个导频端口上，向所述终端发送所述目标小区的CSI-RS。
  5. 根据权利要求3所述的方法，其特征在于，在所述第一基站根据所述目标时频资源，在所述目标小区的A个导频端口和所述协作小区的(S-A)个导频端口上，向终端发送所述目标小区的CSI-RS之后，所述方法还包括：
    所述第一基站接收所述终端发送的所述目标小区的信道状态信息CSI；
    所述第一基站根据所述目标小区的CSI，在S个数据端口上，向所述终端发送所述目标小区的下行数据信号，所述S个数据端口中的A个数据端口与所述目标小区的A个导频端口一一对应，所述S个数据端口中的(S-A)数据端口与所述协作小区的(S-A)个导频端口一一对应。
  6. 根据权利要求4所述的方法，其特征在于，在所述第一基站根据所述目标时频资源，在所述目标小区的A个导频端口上，向终端发送所述目标小区的CSI-RS之后，所述方法还包括：
    所述第一基站接收所述终端发送的所述目标小区的CSI；
    所述第一基站向所述第二基站发送第二通知消息，所述第二通知消息中携带有所述目标小区的CSI和所述目标小区的下行数据信号，以使得所述第二基站根据所述目标小区的CSI，在(S-A)数据端口上，向所述终端发送所述目标小区的下行数据信号，所述(S-A)数据端口与所述协作小区的(S-A)个导频端口一一对应；
    所述第一基站根据所述目标小区的CSI，在A个数据端口上，向所述终端发送所述目标小区的下行数据信号，所述A个数据端口与所述目标小区的A个导频端口一一对应。
  7. 一种信号发送方法，其特征在于，包括：
    第二基站接收第一基站发送的第一通知消息，所述第一通知消息中携带有所述协作小区的小区标识，所述第一基站为覆盖范围与所述第二基站的覆盖范围有交叠的基站；
    所述第二基站根据所述协作小区的小区标识，确定目标时频资源的资源位置和所述协作小区的导频端口，所述目标时频资源为用于发送目标小区的信道状态信息参考信号CSI-RS的时频资源，所述目标小区为所述第一基站覆盖下的小区，所述协作小区的导频端口的数目为(S-A)个，S为不小于2的正整数，A为不小于1且小于S的正整数；
    所述第二基站根据所述目标时频资源，在所述协作小区的(S-A)个导频端口上，向终端发送所述目标小区的CSI-RS，所述终端的信号强度低于预设门限。
  8. 根据权利要求7所述的方法，其特征在于，在所述第二基站根据所述目标时频资源，在所述协作小区的(S-A)个导频端口上，向终端发送所述目标小区的CSI-RS之后，所述方法还包括：
    所述第二基站接收所述第一基站发送的第二通知消息，所述第二通知消息中携带有所述目标小区的信道状态信息CSI和所述目标小区的下行数据信号；
    所述第二基站根据所述目标小区的CSI，在(S-A)个数据端口上，向所述终端发送所述目标小区的下行数据信号，所述(S-A)个数据端口与所述协作小区的(S-A)个导频端口一一对应。
  9. 一种信号发送方法，其特征在于，包括：
    终端接收目标小区的信道状态信息参考信号CSI-RS，所述目标小区的CSI-RS承载于目标时频资源上并通过目标导频端口发送至所述终端，所述目标导频端口包括所述目标小区和协作小区的导频端口，所述协作小区为与所述目标小区联合发送所述目标小区的CSI-RS的小区，所述终端的信号质量强度低于预设门限；
    所述终端根据所述目标小区的CSI-RS获取所述目标小区的信道状态信息CSI；
    所述终端向所述第一基站发送所述目标小区的CSI。
  10. 根据权利要求9所述的方法，其特征在于，在所述终端接收所述目标小区的信道状态信息参考信号CSI-RS之前，所述方法还包括：
    所述终端接收第一基站发送的CSI-RS配置信息，所述CSI-RS配置信息用于指示所述终端的非零功率信道状态信息参考信号CSI-RS配置索引为目标小区的CSI-RS配置索引，以及所述终端的零功率CSI-RS配置索引为包括以下三类CSI-RS资源元素RE的索引：所述终端的非零功率CSI-RS的RE、所述目标小区为其他目标小区联合下发的CSI-RS的RE和所述协作小区为其他目标小区联合下发的CSI-RS的RE，所述目标小区的CSI-RS配置索引用于确定所述目标时频资源，以及所述目标小区的CSI-RS配置索引是根据所述目标小区的小区标识确定的。
  11. 一种基站，其特征在于，所述基站为第一基站，包括：
    处理模块，用于确定目标导频端口和目标小区的协作小区，所述协作小区为与所述目标小区联合发送所述目标小区的信道状态信息参考信号CSI-RS的小区，所述目标导频端口为用于联合发送所述目标小区的CSI-RS的导频端口，所述目标导频端口包括所述目标小区和所述协作小区的导频端口；
    所述处理模块，还用于确定目标时频资源的资源位置，所述目标时频资源为用于发送所述目标小区的CSI-RS的时频资源；
    发送模块，用于根据所述目标时频资源，在所述目标导频端口上，向终端发送所述目标小区的CSI-RS，所述终端的信号强度低于预设门限值。
  12. 根据权利要求11所述的基站，其特征在于，所述处理模块具体用于：
    根据所述目标小区的小区标识确定所述目标小区的CSI-RS配置索引；
    根据所述目标小区的CSI-RS配置索引确定所述目标时频资源的资源位置；
    所述发送模块，还用于：
    向所述终端发送CSI-RS配置信息，所述CSI-RS配置信息用于指示所述终端的非零功率CSI-RS配置索引为所述目标小区的CSI-RS配置索引，以及所述终端的零功率CSI-RS配置索引为包括以下三类CSI-RS资源元素RE的索引：所述终端的非零功率CSI-RS的RE、所述目标小区为其他目标小区联合下发的CSI-RS的RE和所述协作小区为其他目标小区联合下发的CSI-RS的RE。
  13. 根据权利要求11或12所述的基站，其特征在于，所述协作小区为所述第一基站覆盖下的小区；所述目标导频端口的总数为S个，其中所述目标小区的导频端口的数目为A个，所述协作小区的导频端口的数目为(S-A)个，S为不小于2的正整数，A为不小于1且小于S的正整数；
    所述处理模块具体用于：
    根据所述目标时频资源，在所述目标小区的A个导频端口和所述协作小区的(S-A)个导频端口上，向所述终端发送所述目标小区的CSI-RS。
  14. 根据权利要求11或12所述的基站，其特征在于，所述协作小区为第二基站覆盖下的小区，所述第二基站为覆盖与所述第一基站的覆盖范围有交叠的基站；所述目标导频端口的总数为S个，其中，所述协作小区的导频端口的数目为(S-A)个，S为不小于2的正整数，A为不小于1且小于S的正整数；
    所述发送模块还用于：
    向所述第二基站发送第一通知消息，所述第一通知消息中携带有所述协作小区的小区标识；
    所述处理模块具体用于：
    根据所述目标时频资源，在所述目标小区的A个导频端口上，向所述终端发送所述目标小区的CSI-RS。
  15. 根据权利要求13所述的基站，其特征在于，所述基站还包括：
    接收模块，用于接收所述终端发送的所述目标小区的信道状态信息CSI；
    所述发送模块还用于：
    根据所述目标小区的CSI，在S个数据端口上，向所述终端发送所述目标小区的下行数据信号，所述S个数据端口中的A个数据端口与所述目标小区的A个导频端口一一对应，所述S个数据端口中的(S-A)数据端口与所述协作小区的(S-A)个导频端口一一对应。
  16. 根据权利要求14所述的基站，其特征在于，所述基站还包括：
    接收模块，用于接收所述终端发送的所述目标小区的CSI；
    所述发送模块还用于：
    向所述第二基站发送第二通知消息，所述第二通知消息中携带有所述目标小区的CSI和所述目标小区的下行数据信号，以使得所述第二基站根据所述目标小区的CSI，在(S-A)数据端口上，向所述终端发送所述目标小区的下行数据信号，所述(S-A)数据端口与所述协作小区的(S-A)个导频端口一一对应；
    根据所述目标小区的CSI，在A个数据端口上，向所述终端发送所述目标小区的下行数据信号，所述A个数据端口与所述目标小区的A个导频端口一一对应。
  17. 一种基站，其特征在于，所述基站为第二基站，包括：
    接收模块，用于接收第一基站发送的第一通知消息，所述第一通知消息中携带有所述协作小区的小区标识，所述第一基站为覆盖范围与所述第二基站的覆盖范围有交叠的基站；
    处理模块，用于根据所述协作小区的小区标识，确定目标时频资源的资源位置和所述协作小区的导频端口，所述目标时频资源为用于发送目标小区的信道状态信息参考信号 CSI-RS的时频资源，所述目标小区为所述第一基站覆盖下的小区，所述协作小区的导频端口的数目为(S-A)个，S为不小于2的正整数，A为不小于1且小于S的正整数；
    发送模块，用于根据所述目标时频资源，在所述协作小区的(S-A)个导频端口上，向终端发送所述目标小区的CSI-RS，所述终端的信号强度低于预设门限。
  18. 根据权利要求17所述的基站，其特征在于，所述接收模块还用于：
    接收所述第一基站发送的第二通知消息，所述第二通知消息中携带有所述目标小区的信道状态信息CSI和所述目标小区的下行数据信号；
    所述发送模块还用于：
    根据所述目标小区的CSI，在(S-A)个数据端口上，向所述终端发送所述目标小区的下行数据信号，所述(S-A)个数据端口与所述协作小区的(S-A)个导频端口一一对应。
  19. 一种终端，其特征在于，包括：
    接收模块，用于接收目标小区的信道状态信息参考信号CSI-RS，所述目标小区的CSI-RS承载于目标时频资源上并通过目标导频端口发送至所述终端，所述目标导频端口包括所述目标小区和协作小区的导频端口，所述协作小区为与所述目标小区联合发送所述目标小区的CSI-RS的小区，所述终端的信号质量强度低于预设门限；
    处理模块，用于根据所述目标小区的CSI-RS获取所述目标小区的信道状态信息CSI；
    发送模块，用于向所述第一基站发送所述目标小区的CSI。
  20. 根据权利要求19所述的终端，其特征在于，所述接收模块还用于：
    接收第一基站发送的CSI-RS配置信息，所述CSI-RS配置信息用于指示所述终端的非零功率信道状态信息参考信号CSI-RS配置索引为目标小区的CSI-RS配置索引，以及所述终端的零功率CSI-RS配置索引为包括以下三类CSI-RS资源元素RE的索引：所述终端的非零功率CSI-RS的RE、所述目标小区为其他目标小区联合下发的CSI-RS的RE和所述协作小区为其他目标小区联合下发的CSI-RS的RE，所述目标小区的CSI-RS配置索引用于确定所述目标时频资源，以及所述目标小区的CSI-RS配置索引是根据所述目标小区的小区标识确定的。
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