WO2022001226A1 - 探测参考信号srs传输方法及通信装置 - Google Patents

探测参考信号srs传输方法及通信装置 Download PDF

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Publication number
WO2022001226A1
WO2022001226A1 PCT/CN2021/082659 CN2021082659W WO2022001226A1 WO 2022001226 A1 WO2022001226 A1 WO 2022001226A1 CN 2021082659 W CN2021082659 W CN 2021082659W WO 2022001226 A1 WO2022001226 A1 WO 2022001226A1
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WIPO (PCT)
Prior art keywords
srs
terminal device
configuration information
transmission layers
upper limit
Prior art date
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PCT/CN2021/082659
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English (en)
French (fr)
Inventor
陈岩
彭炳光
丁仁天
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Huawei Technologies Co Ltd
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Huawei Technologies Co Ltd
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Priority to EP21833127.0A priority Critical patent/EP4160932A4/en
Publication of WO2022001226A1 publication Critical patent/WO2022001226A1/zh
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
    • H04B7/0413—MIMO systems
    • H04B7/0456—Selection of precoding matrices or codebooks, e.g. using matrices antenna weighting
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00—Baseband systems
    • H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
    • H04L25/0202—Channel estimation
    • H04L25/0224—Channel estimation using sounding signals
    • H04L25/0226—Channel estimation using sounding signals sounding signals per se
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W24/00—Supervisory, monitoring or testing arrangements
    • H04W24/02—Arrangements for optimising operational condition

Definitions

  • the embodiments of the present application relate to the field of electronic technologies, and in particular, to an SRS transmission method and a communication device.
  • Sounding reference signal (sounding reference signal, SRS) is a kind of reference signal used to measure the uplink channel.
  • the network device may perform uplink channel measurement based on the SRS sent by the terminal device to obtain channel state information (CSI) of the uplink channel, so as to facilitate scheduling of uplink resources.
  • the terminal equipment needs to transmit the SRS by means of antenna switching.
  • the network device may estimate the CSI of the downlink channel through the CSI of the uplink channel obtained by measuring the uplink channel, so as to schedule downlink resources.
  • SRS usually include: determining the transmission mode of PUSCH based on code book (CB), determining the transmission mode of PUSCH based on non-code book (NCB), antenna switching (antenna switching, AS) function and For managing beams, etc.
  • CB code book
  • NCB non-code book
  • AS antenna switching
  • PUSCH physical uplink shared channel
  • PRACH physical random access channel
  • PUCCH physical uplink control channel
  • SRS and other channels Both can use SCDD to increase the transmit power.
  • the SRS used for CB can be used when there is no multiplexing of the SRS used for CB and the SRS used for AS, and the number of antenna ports of the SRS used for CB is less than the actual number of transmitting antennas of the terminal equipment.
  • the SRS for the CB is sent in the SCDD manner.
  • the communication system cannot uniquely determine that a single Whether it is a stream mode or a multi-stream mode, the terminal device is not sure whether the SRS used for the CB can be sent in the SCDD manner. Therefore, the scenario in which the traditional SRS used for the CB is sent in the SCDD manner is relatively limited.
  • the present application provides an SRS transmission method and a communication device, thereby expanding the scenario in which the SRS for CB is sent in the SCDD manner, and improving the transmit power.
  • an SRS transmission method comprising: a terminal device receiving first configuration information and second configuration information sent by a network device, where the first configuration information is used to indicate SRS resources used for codebook CB and/or Or whether there is multiplexing of SRS for CB and SRS for antenna switching AS, the second configuration information is used to indicate the waveform used by the network device and the terminal device to communicate, and the maximum number of transmission layers, so
  • the waveform includes discrete Fourier transform extended orthogonal frequency division multiplexing DFT-s-OFDM waveform and/or cyclic prefix orthogonal frequency division multiplexing CP-OFDM waveform;
  • the terminal device determines according to the first configuration information Whether the first preset condition is met, the first preset condition includes the absence of multiplexing of the SRS for CB and the SRS for AS; the terminal device determines whether it is met according to the second configuration information
  • the second preset condition includes that the upper limit of the actual number of transmission layers is smaller than the number of antennas actually used by the terminal
  • the multiplexing of the SRS for CB and the SRS for AS can be understood that the SRS has the CB function, and at the same time, the SRS also has the AS function.
  • the maximum number of transmission layers can be understood as the upper limit of the actual number of transmission layers determined by the communication system.
  • the upper limit of the actual number of transmission layers may be determined according to the waveform used for communication between the network device and the terminal device, and the maximum number of transmission layers.
  • the waveform used for communication between the network device and the terminal device indicated by the second configuration information is the DFT-s-OFDM waveform
  • the upper limit of the actual number of transmission layers can only be 1.
  • the maximum number of transmission layers indicated in the second configuration information may be greater than 1, but the upper limit of the actual number of transmission layers is still 1.
  • the upper limit of the actual number of transmission layers is the maximum number of transmission layers indicated by the second configuration information.
  • SCDD can be understood as sending the same signal with multiple antennas at the same time.
  • the terminal device may determine whether there is an SRS for the AS according to the first configuration information Multiplexing of SRS for CB and SRS for AS.
  • the terminal device may determine the SRS resource according to the first configuration information, And according to the SRS resource, it is determined whether there is multiplexing of the SRS for the CB and the SRS for the AS.
  • the terminal device can determine whether the SRS for CB and the SRS for AS are multiplexed by judging whether the time-frequency resource of the SRS for CB and the time-frequency resource of SRS for AS are the same time-frequency resource. In the case where the time-frequency resources of the SRS for the CB and the time-frequency resources of the SRS for the AS have overlapping time-frequency resources, the terminal device determines that the SRS for the CB and the SRS for the AS are multiplexed; When the time-frequency resources of the SRS of the CB and the time-frequency resources of the SRS used for the AS do not overlap the time-frequency resources, the terminal device determines that the SRS used for the CB and the SRS used for the AS are not multiplexed.
  • the terminal device determines whether there is multiplexing of the SRS for CB and the SRS for AS according to the first configuration information configured by the network device, and determines the actual transmission according to the second configuration information configured by the network device
  • the upper limit of the number of layers so that the terminal device determines that there is no multiplexing of SRS for CB and SRS for AS, and the upper limit of the actual number of transmission layers is less than the actual number of antennas used by the terminal device for transmission.
  • the SRS for the CB is sent to the network device in an SCDD manner.
  • the scenario in which the SRS used for CB is sent in the SCDD manner is expanded, and the transmit power is improved.
  • the first configuration information is further used to indicate the number of antenna ports of the SRS used for CB, and the terminal device uses a small cyclic delay diversity SCDD
  • the method of sending the SRS for CB to the network device includes: the terminal device determines whether the upper limit of the actual number of transmission layers is greater than or equal to 2; when the upper limit of the actual number of transmission layers is greater than or equal to 2
  • the terminal device sends the SRS for CB to the network device in SCDD mode on the N antenna ports of the SRS for CB, where N is equal to the actual transmission
  • the terminal device uses multiple antennas on an antenna port for the SRS of the CB in SCDD mode
  • the SRS for CB is sent to the network device.
  • the terminal device uses multiple antennas on an antenna port for the SRS of the CB, and sends the SRS for the CB to the network device in the SCDD manner.
  • SRS for CB of the antenna port At this time, the SRS for CB sent by the terminal device on multiple antennas is the same.
  • the terminal device uses multiple antennas on the N antenna ports of the SRS for CB, and sends the SRS for CB to the network device in SCDD mode, which may be: the multiple antennas are divided into N group, the terminal device transmits the SRS for CB of a single antenna port in SCDD mode on each antenna in each group of antennas. At this time, the SRS for CB sent by the terminal device on each antenna in each group of antennas is the same.
  • the terminal device determines whether the upper limit of the actual number of transmission layers is greater than or equal to 2; if the upper limit of the actual number of transmission layers is greater than or equal to 2, the terminal device uses multiple antennas to connect N On the antenna port of the SRS for CB, the SRS for CB is sent to the network device in an SCDD manner, where N is equal to the upper limit of the actual number of transmission layers; or the upper limit of the number of actual transmission layers In the case of less than 2, the terminal device uses multiple antennas on an antenna port for the SRS of the CB to send the SRS for the CB to the network device in the SCDD mode, thereby extending the SRS for the CB to adopt the SCDD mode. In the sending scenario, the transmit power is improved.
  • the upper limit of the actual number of transmission layers is 1.
  • the upper limit of the actual number of transmission layers is the maximum number of transmission layers.
  • the first configuration information is carried in an SRS configuration message.
  • the second configuration information is carried in a physical uplink shared channel PUSCH configuration message.
  • the transmit precoding field in the PUSCH configuration message may indicate the waveform.
  • the maximum rank field in the PUSCH configuration message may indicate the maximum number of transmission layers.
  • the maximum number of transmission layers is less than or equal to the minimum of the number of antenna ports and the number of transmit antennas of the SRS for CB, and the number of antenna ports for CB The number of antenna ports of the SRS is less than the number of transmit antennas.
  • an SRS transmission method including: a network device configures first configuration information and second configuration information, where the first configuration information is used to indicate SRS resources for codebook CB and/or whether they exist Multiplexing of the SRS used for CB and the SRS used for antenna switching AS, the second configuration information is used to indicate the waveform used by the network device and the terminal device to communicate, and the maximum number of transmission layers, the waveform includes Discrete Fourier Transform Extended Orthogonal Frequency Division Multiplexing DFT-s-OFDM waveform and/or Cyclic Prefix Orthogonal Frequency Division Multiplexing CP-OFDM waveform; the network device sends the first configuration information to the terminal device and the second configuration information, the first configuration information is used by the terminal device to determine whether a first preset condition is met, and the first preset condition includes the absence of the SRS for CB and the AS for AS multiplexing of the SRS, the second configuration information is used by the terminal device to determine whether a second preset condition is met
  • the upper limit of the actual number of transmission layers is determined according to the waveform and the maximum number of transmission layers; the network device receives the terminal device and uses a small cyclic delay diversity SCDD method.
  • the sent SRS for CB, the SRS for CB sent by the terminal device in the SCDD manner is when the terminal device determines that the first preset condition and the second preset condition are met. in the case of.
  • the network device may determine the first configuration information and the second configuration information by using the antenna rotation capability message reported by the terminal device.
  • the antenna rotation capability can be understood as the number of receiving antennas and the number of transmitting antennas in the antenna of the terminal device.
  • the network device can determine whether the SRS used for CB and the SRS used for AS overlap by judging whether the time-frequency resource of the SRS used for CB and the time-frequency resource of SRS used for AS are the same time-frequency resource. use. After the network device determines whether the SRS for the CB and the SRS for the AS are multiplexed, the network device may indicate whether there is multiplexing of the SRS for the CB and the SRS for the AS through the first configuration information.
  • the network device determines that the SRS used for the CB and the SRS used for the AS are multiplexed; In the case where the time-frequency resources of the SRS for the CB and the time-frequency resources of the SRS for the AS do not overlap the time-frequency resources, the network device determines that the SRS for the CB and the SRS for the AS are not multiplexed.
  • the network device may also reconfigure the target parameters, and send the reconfigured target parameters to the terminal device, so that the terminal device determines whether the preset conditions are met according to the reconfigured target parameters.
  • the target parameter includes at least one of the following: the SRS resource in the first configuration information, the number of ports in the first configuration information, whether there is multiplexing of SRS for CB and SRS for AS in the first configuration information or second configuration information.
  • the network device may periodically reconfigure the target parameters.
  • the network device may reconfigure the target parameters according to other parameters.
  • the other parameters include at least one of the following: signal strength of the terminal device or power consumption of the terminal device.
  • the network device may receive an auxiliary message reported by the terminal device, where the reported auxiliary message is used to request the network device to reconfigure the target parameter, so that the network device reconfigures the target parameter according to the auxiliary message.
  • the network device configures the first configuration information and the second configuration information, and the first configuration information is used for the SRS resources of the CB and/or whether there is an SRS for the CB and an SRS for the antenna switching AS
  • the second configuration information is used to indicate the waveform used for communication between the network device and the terminal device, and the maximum number of transmission layers.
  • the network device sends the first configuration information and the second configuration information to the terminal device, where the first configuration information and the second configuration information are used by the terminal device to determine whether a complex combination of the SRS for CB and the SRS for AS is not satisfied.
  • the second configuration information is used by the terminal device to determine whether the upper limit of the actual number of transmission layers is less than the number of antennas used by the terminal device for transmission; finally, when the two conditions are met, the network device receives The SRS for CB sent by the terminal device in SCDD mode.
  • the scenario in which the SRS used for CB is sent in the SCDD manner is expanded, and the transmit power is improved.
  • the first configuration information is further used to indicate the number of antenna ports of the SRS used for CB, and the network device receives the terminal device and uses a smaller number of antenna ports.
  • the SRS for CB sent in the cyclic delay diversity SCDD manner includes: when the upper limit of the actual number of transmission layers is greater than or equal to 2, the network device receives multiple antennas used by the terminal device On the N antenna ports of the SRS for CB, the SRS for CB sent in SCDD mode, where N is equal to the upper limit of the actual number of transmission layers; In the case where the upper limit is less than 2, the network device receives the SRS for the CB sent by the terminal device using multiple antennas on one antenna port for the SRS for the CB in the SCDD manner.
  • the upper limit of the actual number of transmission layers is 1.
  • the upper limit of the actual number of transmission layers is the maximum number of transmission layers.
  • the first configuration information is carried in an SRS configuration message.
  • the second configuration information is carried in a physical uplink shared channel PUSCH configuration message.
  • the maximum number of transmission layers is less than or equal to the minimum of the number of antenna ports and the number of transmit antennas of the SRS for CB, and the number of antenna ports for CB The number of antenna ports of the SRS is less than the number of transmit antennas.
  • a terminal device including: a transceiver module configured to receive first configuration information and second configuration information sent by a network device, where the first configuration information is used to indicate an SRS resource for a codebook CB And/or whether there is multiplexing of SRS for CB and SRS for antenna switching AS, the second configuration information is used to indicate the waveform used by the network device and the terminal device to communicate, and the maximum number of transmission layers , the waveform includes discrete Fourier transform extended orthogonal frequency division multiplexing DFT-s-OFDM waveform and/or cyclic prefix orthogonal frequency division multiplexing CP-OFDM waveform; processing module, for according to the first configuration information to determine whether a first preset condition is met, the first preset condition includes the absence of multiplexing of the SRS used for CB and the SRS used for antenna switching AS; the processing module is further configured to The second configuration information is used to determine whether a second preset condition is satisfied, where the second preset condition includes that the upper limit
  • the first configuration information is further used to indicate the number of antenna ports used for the SRS of the CB
  • the processing module is further configured to determine the actual transmission layer Whether the upper limit of the number of transmission layers is greater than or equal to 2
  • the transceiver module is further configured to: when the upper limit of the actual number of transmission layers is greater than or equal to 2, use multiple antennas in the N On the antenna port of the SRS of the CB, send the SRS for the CB to the network device in an SCDD manner, where N is equal to the upper limit of the actual number of transmission layers; or at the upper limit of the actual number of transmission layers In the case of less than 2, the SRS for the CB is sent to the network device in SCDD mode by using multiple antennas on one antenna port for the SRS for the CB.
  • the upper limit of the actual number of transmission layers is 1.
  • the upper limit of the actual number of transmission layers is the maximum number of transmission layers.
  • the first configuration information is carried in an SRS configuration message.
  • the second configuration information is carried in a physical uplink shared channel PUSCH configuration message.
  • the maximum number of transmission layers is less than or equal to the minimum of the number of antenna ports and the number of transmit antennas of the SRS for CB, and the number of antenna ports for CB The number of antenna ports of the SRS is less than the number of transmit antennas.
  • a network device including a processing module configured to configure first configuration information and second configuration information, where the first configuration information is used to indicate SRS resources for codebook CB and/or whether they exist or not Multiplexing of the SRS used for CB and the SRS used for antenna switching AS, the second configuration information is used to indicate the waveform used by the network device and the terminal device to communicate, and the maximum number of transmission layers, the waveform includes Discrete Fourier Transform Extended Orthogonal Frequency Division Multiplexing DFT-s-OFDM waveform and/or Cyclic Prefix Orthogonal Frequency Division Multiplexing CP-OFDM waveform; a transceiver module, configured to send the first configuration to the terminal device information and the second configuration information, the first configuration information is used by the terminal device to determine whether a first preset condition is met, and the first preset condition includes the absence of the SRS for CB and the Multiplexing of the SRS of the antenna switching AS, the second configuration information is used by the terminal device to determine
  • the first configuration information is further used to indicate the number of antenna ports used for the SRS of the CB
  • the transceiver module is further configured to: in the actual transmission When the upper limit of the number of layers is greater than or equal to 2, receiving the SRS for CB sent by the terminal device in the SCDD mode on the N antenna ports of the SRS for CB using multiple antennas , where N is equal to the upper limit of the actual number of transmission layers; or in the case where the upper limit of the actual number of transmission layers is less than 2, receiving the SRS using multiple antennas of the terminal device in one SRS for the CB On the antenna port of , the SRS for CB sent in SCDD mode.
  • the upper limit of the actual number of transmission layers is 1.
  • the upper limit of the actual number of transmission layers is the maximum number of transmission layers.
  • the first configuration information is carried in an SRS configuration message.
  • the second configuration information is carried in a physical uplink shared channel PUSCH configuration message.
  • the maximum number of transmission layers is less than or equal to the minimum of the number of antenna ports and the number of transmit antennas of the SRS for CB, and the number of antenna ports for CB The number of antenna ports of the SRS is less than the number of transmit antennas.
  • a communication apparatus may be a terminal device or a chip in the terminal device.
  • the apparatus may include a processing unit and a transceiving unit.
  • the processing unit may be a processor, and the transceiver unit may be a transceiver;
  • the terminal device may further include a storage unit, and the storage unit may be a memory;
  • the processing unit executes the instructions stored in the storage unit, so that the terminal device executes the method in the first aspect.
  • the processing unit may be a processor, the transceiver unit may be an input/output interface, a pin or a circuit, etc.; the processing unit executes the instructions stored in the storage unit,
  • the storage unit may be a storage unit (eg, a register, a cache, etc.) in the chip, or a storage unit in the terminal device located outside the chip storage unit (eg, read only memory, random access memory, etc.).
  • a communication apparatus may be a network device or a chip in the network device.
  • the apparatus may include a processing unit and a transceiving unit.
  • the processing unit may be a processor, and the transceiver unit may be a transceiver;
  • the network device may further include a storage unit, and the storage unit may be a memory;
  • the processing unit executes the instructions stored in the storage unit, so that the network device executes the method in the second aspect.
  • the processing unit may be a processor, the transceiver unit may be an input/output interface, a pin or a circuit, etc.; the processing unit executes the instructions stored in the storage unit,
  • the storage unit may be a storage unit (eg, a register, a cache, etc.) in the chip, or a storage unit in the network device located outside the chip storage unit (eg, read only memory, random access memory, etc.).
  • a computer program product comprising: computer program code, which, when the computer program code is run on a computer, causes the computer to perform the methods in the above aspects.
  • the above computer program code may be stored in whole or in part on the first storage medium, where the first storage medium may be packaged with the processor or separately packaged with the processor, which is not implemented in this embodiment of the present application. Specific restrictions.
  • a computer-readable medium stores program codes, which, when executed on a computer, cause the computer to execute the methods in the above-mentioned aspects.
  • FIG. 1 is a schematic diagram of a communication system 100 according to a method provided by an embodiment of the present application.
  • FIG. 2 is a schematic flowchart of SCDD precoding in the prior art.
  • FIG. 3 is a schematic flowchart of an SRS transmission method provided by an embodiment of the present application.
  • FIG. 4 is a schematic flowchart of communication between a terminal device and a network device according to an embodiment of the present application.
  • FIG. 5 is a schematic diagram of a communication device provided by an embodiment of the present application.
  • FIG. 6 is a schematic structural diagram of a terminal device provided by an embodiment of the present application.
  • FIG. 7 is a schematic diagram of a communication device provided by another embodiment of the present application.
  • FIG. 8 is a schematic structural diagram of a network device provided by an embodiment of the present application.
  • GSM global system for mobile communications
  • CDMA code division multiple access
  • WCDMA wideband code division multiple access
  • GPRS general packet radio service
  • long term evolution long term evolution
  • LTE long term evolution
  • LTE frequency division duplex frequency division duplex
  • TDD time division duplex
  • UMTS universal mobile telecommunication system
  • WiMAX worldwide interoperability for microwave access
  • FIG. 1 shows a schematic diagram of a communication system 100 suitable for the method provided by this embodiment of the present application.
  • the communication system 100 may include at least one network device, such as a base station (gNB) in a 5G system as shown in FIG. 1 ; the communication system 100 may also include at least one terminal device, as shown in FIG. 1 The user equipment (user equipment, UE) 1 to UE 6. Communication between the network device and each terminal device can be done through a wireless link.
  • gNB base station
  • UE user equipment
  • the network device may send configuration information to the terminal device, and the terminal device may send uplink data to the network device based on the configuration information; for another example, the network device may send downlink data to the terminal device. Therefore, the gNB and UE 1 to UE 6 in FIG. 1 may constitute a communication system.
  • the terminal devices in the communication system 100 may also constitute a communication system.
  • UE 4 can control UE 5 and UE 6 to execute corresponding instructions. This application does not limit this.
  • the terminal device in this embodiment of the present application may refer to a user equipment, an access terminal, a subscriber unit, a subscriber station, a mobile station, a mobile station, a remote station, a remote terminal, a mobile device, a user terminal, a terminal, a wireless communication device, a user agent or user device.
  • the terminal device may also be a cellular phone, a cordless phone, a session initiation protocol (SIP) phone, a wireless local loop (WLL) station, a personal digital assistant (PDA), a wireless communication Functional handheld devices, computing devices or other processing devices connected to wireless modems, in-vehicle devices, wearable devices, terminal devices in future 5G networks or future evolved public land mobile networks (PLMN)
  • SIP session initiation protocol
  • WLL wireless local loop
  • PDA personal digital assistant
  • a terminal device, etc. is not limited in this embodiment of the present application.
  • the terminal device may also be a wearable device.
  • Wearable devices can also be called wearable smart devices, which are the general term for the intelligent design of daily wear and the development of wearable devices using wearable technology, such as glasses, gloves, watches, clothing and shoes.
  • a wearable device is a portable device that is worn directly on the body or integrated into the user's clothing or accessories. Wearable device is not only a hardware device, but also realizes powerful functions through software support, data interaction, and cloud interaction.
  • wearable smart devices include full-featured, large-scale, complete or partial functions without relying on smart phones, such as smart watches or smart glasses, and only focus on a certain type of application function, which needs to cooperate with other devices such as smart phones.
  • the terminal device may also be a terminal device in an Internet of Things (IoT) system.
  • IoT Internet of Things
  • IoT is an important part of the future development of information technology, and its main technical feature is that items pass through communication technology Connect with the network, so as to realize the intelligent network of human-machine interconnection and interconnection of things.
  • the IOT technology can achieve massive connections, deep coverage, and power saving of terminals through, for example, a narrow band (narrow band) NB technology.
  • the NB only includes one resource block (resource bloc, RB), that is, the bandwidth of the NB is only 180KB.
  • resource bloc resource block
  • the terminals must be discrete in access. According to the communication method of the embodiment of the present application, the congestion problem of the massive terminals of the IOT technology when accessing the network through the NB can be effectively solved.
  • the network device in this embodiment of the present application may be a device for communicating with a terminal device, and the network device may be a global system for mobile communications (GSM) system or code division multiple access (CDMA)
  • the base station (base transceiver station, BTS) in the LTE system can also be the base station (NodeB, NB) in the wideband code division multiple access (WCDMA) system, or the evolved base station (evolved) in the LTE system NodeB, eNB or eNodeB), it can also be a wireless controller in a cloud radio access network (CRAN) scenario, or the network device can be a relay station, an access point, an in-vehicle device, a wearable device, and future
  • the network equipment in the 5G network or the network equipment in the future evolved PLMN network, etc. can be an access point (access point, AP) in a WLAN, or a gNB in a new wireless system (new radio, NR) system
  • This application is not limited.
  • a gNB may include a centralized unit (CU) and a DU.
  • the gNB may also include a radio unit (RU).
  • CU implements some functions of gNB
  • DU implements some functions of gNB, for example, CU implements radio resource control (radio resource control, RRC), packet data convergence protocol (packet data convergence protocol, PDCP) layer functions
  • DU implements wireless chain
  • the functions of the road control radio link control, RLC
  • media access control media access control, MAC
  • physical (physical, PHY) layers The functions of the road control (radio link control, RLC), media access control (media access control, MAC) and physical (physical, PHY) layers.
  • the higher-layer signaling such as the RRC layer signaling
  • the network device may be a CU node, or a DU node, or a device including a CU node and a DU node.
  • the CU may be divided into network devices in an access network (radio access network, RAN), and the CU may also be divided into network devices in a core network (core network, CN), which is not limited in this application.
  • a network device provides services for a cell
  • a terminal device communicates with the network device through transmission resources (for example, frequency domain resources, or spectrum resources) used by the cell
  • the cell may be a network device
  • a cell corresponding to a cell such as a base station
  • the cell may belong to a macro base station, or it may belong to a base station corresponding to a small cell.
  • the small cell here may include: urban cell (metro cell), micro cell (micro cell), pico cell (pico cell), femto 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 carrier in an LTE system or a 5G system can have multiple cells working on the same frequency at the same time.
  • the concepts of the above-mentioned carrier and cell can also be considered equivalent.
  • CA carrier aggregation
  • the carrier index of the secondary carrier and the cell identification (Cell ID) of the secondary cell operating on the secondary carrier will be carried at the same time.
  • the concepts of the carrier and the cell are equivalent, for example, the UE accessing a carrier is equivalent to accessing a cell.
  • the core network device may be connected with a plurality of network devices for controlling the network devices, and may distribute data received from the network side (eg, the Internet) to the network devices.
  • the network side eg, the Internet
  • the terminal device or the network device includes a hardware layer, an operating system layer running on the hardware layer, and an application layer running on the operating system layer.
  • the hardware layer includes hardware such as a central processing unit (CPU), a memory management unit (MMU), and memory (also called main memory).
  • the operating system can be any one or more computer operating systems that implement business processing through processes, for example, operating system, operating system, operating system, operating system or operating system, etc.
  • the application layer includes applications such as browsers, address books, word processing software, and instant messaging software.
  • the embodiments of the present application do not specifically limit the specific structure of the execution body of the methods provided by the embodiments of the present application, as long as the program that records the codes of the methods provided by the embodiments of the present application can be executed to provide the methods according to the embodiments of the present application.
  • the execution subject of the method provided by the embodiment of the present application may be a terminal device or a network device, or a functional module in the terminal device or network device that can call and execute a program.
  • FIG. 1 is only a simplified schematic diagram for easy understanding, and the communication system 100 may also include other network devices or other terminal devices, which are not shown in FIG. 1 .
  • SRS Sounding reference signal
  • the network device may estimate the channel state of the uplink channel based on the SRS sent by the terminal, so as to schedule the terminal device to transmit the PUSCH.
  • SRS can also be used by network equipment to estimate the channel state of the downlink channel.
  • An antenna port is a logical concept.
  • An antenna port can be a physical transmit antenna or a combination of multiple physical transmit antennas.
  • the receiver usually does not decompose the signal from the same antenna port, because from the receiver's point of view, it does not matter whether the signal is formed by a single physical transmit antenna or by multiple physical
  • the transmit antennas are combined, and the reference signal (RS) corresponding to the antenna port defines the antenna port.
  • the network device can obtain the channel estimation of the antenna port according to the SRS sent by the terminal device.
  • one SRS resource set includes one or more SRS resources for transmitting SRS.
  • various functions are configured for the SRS.
  • the resources for transmitting SRSs with different functions are usually configured based on the above-mentioned SRS resource set and the framework of the SRS resources. Due to the different requirements of each function on the SRS, the resulting SRS resource set and the configuration of the SRS resources are also different.
  • the functions of the SRS usually include: determining the transmission mode of the PUSCH based on the code book (CB), determining the transmission mode of the PUSCH based on the non-code book (NCB), antenna switching (antenna switching, AS) ) function and for managing beams, etc.
  • CB code book
  • NCB non-code book
  • AS antenna switching
  • the antenna switching function of SRS is used in TDD that the number of antennas (or “transmitting antennas") of the transmitter (Transmitter, Tx) of the terminal equipment is less than that of the receiver (Receiver, Rx) (or “receiving antennas")
  • the radio frequency (Radio Frequency, RF) channel of the terminal device is expensive to manufacture, so that the uplink transmission channel of the terminal device is limited. Since the number of transmit antennas of the terminal device is less than the number of receive antennas, when the network device measures the channel state of the downlink channel corresponding to the receive antenna through SRS, the terminal device needs to transmit through the antenna switch (or called antenna rotation).
  • the antenna sends the SRS corresponding to the receiving antenna to the network device, so that the network device can estimate the channel states corresponding to all the receiving antennas. That is, for the SRS resources in the SRS resource set used for antenna switching, the Tx channel that can be sent is sent through one SRS resource at a time, and then switched to another Rx channel, and the SRS resources of the remaining Rx channels are sent. These SRS resources are in different It is transmitted on orthogonal frequency division multiplexing (OFDM) symbols. Through the rotation of SRS resources on different antennas, the base station can obtain the channel state information of all Rx channels.
  • OFDM orthogonal frequency division multiplexing
  • the following takes 1T2R terminal equipment, 2T4R terminal equipment and 1T4R terminal equipment as examples to introduce the SRS resource set with "antenna switching" function and the configuration mode of SRS resources.
  • the SRS resource set configured by the network device for the terminal device includes two SRS resources, and each SRS resource corresponds to one antenna port.
  • the terminal device polls one Rx antenna each time, and sends the SRS corresponding to the Rx antenna on the Tx antenna. In this way, the terminal device needs to finish sending the SRS corresponding to the two Rx antennas in the above two SRS resources, so that the network device can obtain the channel state of the channel corresponding to the two Rx antennas.
  • the SRS resource set configured by the network device for the terminal device includes two SRS resources, and each SRS resource corresponds to two antenna ports.
  • the terminal device can poll two Rx antennas each time, and for the same SRS resource, it can correspond to different antenna ports, and the SRS resource is sent on both Tx.
  • the terminal device needs to send the SRS corresponding to the four Rx antennas on the two SRS resources, so that the network device can obtain the channel state of the channel corresponding to the four Rx antennas.
  • the network device configures an SRS resource set for the terminal device, the SRS resource set includes 4 SRS resources, and each SRS resource corresponds to 4 antenna ports respectively.
  • the terminal equipment polls one Rx antenna each time, and the terminal equipment sends SRS on the SRS resource corresponding to the Rx antenna through one Tx antenna.
  • the terminal device needs to finish sending the SRS resources corresponding to the four Rx antennas on the four SRS resources, so that the network device can obtain the channel states of the channels corresponding to the four Rx antennas.
  • Manner 2 For aperiodic SRS, there are two polling modes: 1. The network device configures two SRS resource sets for the terminal device, and each SRS resource set has two SRS resources. 2. The network device configures two SRS resource sets for the terminal device, wherein one SRS resource set contains one SRS resource, and the other SRS resource set contains three SRS resources.
  • each SRS resource occupies one OFDM symbol, and the guard interval between SRS resources is one OFDM symbol.
  • SCDD Small cyclic delay diversity
  • SCDD can be understood as sending the "same" signal with multiple antennas at the same time.
  • the SCDD can boost the overall transmit power. For example, if two antennas are used to transmit the A signal at the same time, the transmit power can be doubled, that is, 3dB. For another example, if four antennas are used to transmit the A signal at the same time, the transmit power can be increased by 4 times, that is, 6dB.
  • PUSCH Physical random access channel
  • PRACH physical random access channel
  • PUCCH physical uplink control channel
  • SRS can all use SCDD to improve transmit power.
  • W is the precoding matrix, and the dimension is Ntx ⁇ Ntx'.
  • Ntx is the number of transmit antennas, for example, Ntx can be 2, 4, 8, 32, 64 or 256, etc.
  • Ntx' is the dimension of the subspace used for precoding, for example, Ntx' may be 2, and when Ntx is equal to Ntx', W may be an identity matrix of Ntx ⁇ Ntx.
  • D(k) is a tone-dependent cyclic delay matrix with dimension Ntx' ⁇ Ntx', where k is a resource element (RE) index.
  • Ux is the stream virtualization matrix, and the dimension is Ntx ⁇ R.
  • Ntx ⁇ R can be the first R columns selected from the discrete Fourier transform (DFT) matrix of Ntx' ⁇ Ntx', and R is the rank or stream number.
  • DFT discrete Fourier transform
  • D(k) diag ⁇ 1,e- j2 ⁇ kd ⁇
  • d is a delay value (delay)
  • CP cyclic prefix
  • Step 1 the communication system or device scrambles one or more codewords; Step 2, modulates the scrambled codewords; Step 3, performs DFT on the modulated codewords Step 4, the codeword after the DFT is carried out SCDD precoding; Step 5, the signal of SCDD precoding is carried out RE mapping; Step 6, the signal after the mapping is carried out inverse fast Fourier transform (inverse fast fourier transform, IFFT) ); Step 7: Transmit the IFFT signal through the corresponding antenna.
  • Step 2 the communication system or device scrambles one or more codewords
  • Step 2 modulates the scrambled codewords
  • Step 3 performs DFT on the modulated codewords
  • Step 5 the signal of SCDD precoding is carried out RE mapping
  • Step 6 the signal after the mapping is carried out inverse fast Fourier transform (inverse fast fourier transform, IFFT) );
  • Step 7 Transmit the IFFT signal through the corresponding antenna.
  • the CP-OFDM waveform is introduced, which is used for uplink transmission.
  • the CP-OFDM waveform is relatively high in resource utilization and allocation flexibility.
  • the peak-average value of the CP-OFDM waveform is relatively high, resulting in a relatively large maximum power reduction (MPR) of the CP-OFDM waveform compared to the DFT-s-OFDM waveform.
  • MPR maximum power reduction
  • Waveform adaptive switching means that the network device switches the uplink waveform of the terminal device between the DFT-s-OFDM waveform and the CP-OFDM waveform according to the signal quality of the terminal device. For example, at the far point (where the signal is poor, the modulation method generally used is QPSK), the DFT-s-OFDM waveform will have a maximum power gain of 1.5dB to 2dB.
  • the SRS currently used for the CB can be sent in the SCDD manner when the following conditions A and B are satisfied.
  • Condition A there is no multiplexing of SRS for CB and SRS for AS;
  • Condition B the number of ports of SRS for CB is less than the actual number of transmit antennas of the terminal equipment.
  • the actual number of transmit antennas can be understood as the actual number of transmit antennas.
  • SCDD may be adopted, and the terminal device sends the SRS for CB to the network device.
  • the number of ports configured by the network device for the SRS of the CB is 2, which is greater than the maximum number of ports that can be supported by the round-robin mode 1T4R. At this time, it may be because the terminal device supports the 1T4R/2T4R capability, and the network device side modifies the rotation mode to 1T4R, but the network device side does not modify the port number in the SRS configuration message accordingly.
  • the serial number is 7
  • the round-robin mode is 1T4R
  • the number of SRS ports configured by the network device for CB is 1, but the terminal can have the transmission capability of more than one antenna, so it can also Use SCDD.
  • the terminal device determines that the above conditions A and B are satisfied .
  • the communication system is in the single-stream mode, and the terminal device determines that the SRS used for the CB can be sent in the SCDD manner.
  • the number of ports is greater than or equal to 2
  • the number of transmit antennas is equal to the number of ports, at this time, the communication system cannot uniquely determine the single-stream mode It is still a multi-stream mode. Therefore, the terminal device is not sure whether the SRS used for the CB can be sent in the SCDD manner.
  • the present application provides an SRS transmission method, which can determine whether the SRS used for CB can be sent by SCDD according to the upper limit of the actual number of transmission layers in the communication system, thereby broadening the use of SRS for CB. Scenarios sent by SCDD.
  • FIG. 3 it is a schematic flowchart of an SRS transmission method 200 provided by an embodiment of the present application.
  • Step 210 the network device configures the first configuration information and the second configuration information
  • the first configuration information is used to indicate the SRS resource for the CB and/or whether there is multiplexing of the SRS for the CB and the SRS for the antenna switching AS
  • the second configuration information is used to indicate the waveform used by the network device and the terminal device for communication, and the maximum number of transmission layers
  • the waveform includes DFT-s-OFDM waveform and/or CP-OFDM waveform.
  • the network device can determine whether the SRS used for CB and the SRS used for AS overlap by judging whether the time-frequency resource of the SRS used for CB and the time-frequency resource of SRS used for AS are the same time-frequency resource. use. After the network device determines whether the SRS for the CB and the SRS for the AS are multiplexed, the network device may indicate through the first configuration information whether there is multiplexing of the SRS for the CB and the SRS for the AS.
  • the network device determines that the SRS used for the CB and the SRS used for the AS are multiplexed; In the case where the time-frequency resources of the SRS for the CB and the time-frequency resources of the SRS for the AS do not overlap the time-frequency resources, the network device determines that the SRS for the CB and the SRS for the AS are not multiplexed.
  • the SRS resource indicated by the first configuration information may be indicated by an identifier of the SRS resource.
  • the second configuration information may respectively indicate the waveform used by the network device and the terminal device for communication and the maximum number of transmission layers through two fields.
  • the second configuration information may include a first field and a second field, where the first field is used to indicate a waveform used for communication between the network device and the terminal device, and the second field is used to indicate the maximum number of transmission layers .
  • the second configuration information may use a field to indicate the waveform used by the network device and the terminal device to communicate, and the maximum number of transmission layers.
  • the second configuration information may include a third field, where the third field is used to indicate a waveform used for communication between the network device and the terminal device, and the maximum number of transmission layers.
  • the second configuration information is given by taking the second configuration information as an example to indicate the waveform used for communication between the network device and the terminal device and the maximum number of transmission layers respectively through two fields.
  • the first field may use Enable and Disable respectively to indicate the waveform used by the network device and the terminal device to communicate.
  • the first field may use Disable to indicate that the waveform used for communication between the network device and the terminal device is a DFT-s-OFDM waveform, and the first field may use Disable to indicate that the network device and the terminal device use for communication.
  • the waveform is a CP-OFDM waveform.
  • the first field may use Enable to indicate that the waveform used for communication between the network device and the terminal device is a CP-OFDM waveform, and the first field may use Disable to indicate that the waveform used for communication between the network device and the terminal device is DFT-s-OFDM waveform.
  • the waveform used in the first field to indicate that the network device and the terminal device communicate is DFT-s-OFDM waveform
  • the first field to use Disable to indicate that the waveform used by the network device and the terminal device to communicate is CP - OFDM waveform
  • the communication system formed between network equipment and terminal equipment can be divided into single-stream mode and multi-stream mode.
  • Stream refers to the flow of data.
  • Single and multiple refer to how many channels of data are being transmitted at the same time.
  • Data transmission can include ordinary single-antenna transmission, diversity transmission, and multi-input multi-output (MIMO) spatial multiplexing.
  • MIMO spatial multiplexing uses multiple antennas to transmit different contents at the same time. For terminal equipment, it is equivalent to multiple data streams at a time, so it is a multi-stream mode.
  • the transmitting antenna of the terminal device has antenna A and antenna B, and needs to transmit signal A and signal B. If at time t1, the terminal device sends signal A through antenna A, and at time t2, the terminal device sends signal B through antenna A again, this time is a single-stream mode. If at time t1, the terminal device transmits signal A through antenna A and signal B through antenna B respectively, this is the dual/multi-stream mode.
  • the network device can also determine whether the previous channel quality is suitable for single-stream or multi-stream according to the minimum value of the maximum number of transmission layers indicated by the network device and the actual rank of the channel matrix in the second configuration information, and determine the actual channel quality.
  • the number of transmission ranks/layers are the number of transmission ranks/layers.
  • the maximum number of transmission layers indicated by the second configuration information may be understood as the upper limit value of the actual number of transmission layers determined by the communication system.
  • the upper limit value of the implied actual number of transmission layers can only be set to 1. At this time, the maximum number of transmission layers indicated in the second field may be greater than 1, but the upper limit of the actual number of transmission layers is still 1.
  • the upper limit of the actual number of transmission layers may be determined by the minimum value of the maximum number of transmission layers indicated by the second field and the maximum number of transmission layers implied by the first field.
  • the actual number of transmission layers is jointly determined by the rank of the channel matrix and the upper limit of the actual number of transmission layers. Among them, the rank of the channel matrix is changed.
  • the maximum number of transmission layers ⁇ min(number of SRS ports, number of transmit antennas), and the number of SRS ports ⁇ the number of transmit antennas.
  • the first configuration information may be carried in an SRS configuration message (SRS-Config).
  • SRS-Config SRS configuration message
  • the second configuration information may be carried in a PUSCH configuration message (PUSCH-Config).
  • the first field may be a transmission precoding (transformPrecoder) field.
  • the second field may be a maxRank field.
  • the first configuration information and the second configuration information may be carried in two messages respectively. In other embodiments, the first configuration information and the second configuration information may be carried in different fields of the same message.
  • the network device may receive the antenna polling capability message sent by the terminal device, and determine the first configuration information and the second configuration information according to the antenna polling capability message sent by the terminal device.
  • the antenna rotation capability can be understood as the number of receiving antennas and the number of transmitting antennas in the antenna of the terminal device.
  • the network device sends the first configuration information and the second configuration information to the terminal device.
  • the terminal device receives the first configuration information and the second configuration information sent by the network device.
  • the terminal device communicates with the network device according to the first configuration information and the second configuration information.
  • S230 may include S231 to S235.
  • the terminal device determines whether the condition for sending the SRS for the CB in the SCDD manner is satisfied.
  • the conditions for sending the SRS for CB in SCDD mode include: Condition 1, there is no multiplexing of SRS for CB and SRS for AS; Condition 2, the upper limit of the actual number of transmission layers is less than that of the terminal equipment Actual number of transmit antennas.
  • the terminal device may determine the SRS resource, The number of ports, and whether there is multiplexing of SRS for CB and SRS for AS.
  • the terminal device determines the SRS resource according to the first configuration information, thereby The terminal device itself determines whether there is multiplexing of the SRS for the CB and the SRS for the AS.
  • the terminal device can determine whether the SRS for CB and the SRS for AS are multiplexed by judging whether the time-frequency resource of the SRS for CB and the time-frequency resource of SRS for AS are the same time-frequency resource. In the case where the time-frequency resources of the SRS for the CB and the time-frequency resources of the SRS for the AS have overlapping time-frequency resources, the terminal device determines that the SRS for the CB and the SRS for the AS are multiplexed; When the time-frequency resources of the SRS of the CB and the time-frequency resources of the SRS used for the AS do not overlap the time-frequency resources, the terminal device determines that the SRS used for the CB and the SRS used for the AS are not multiplexed.
  • the terminal device determines, according to the second configuration information, the waveform used by the network device and the terminal device for communication and the maximum number of transmission layers, so as to determine the upper limit of the actual number of transmission layers.
  • the upper limit of the actual number of transmission layers is 1.
  • the upper limit of the actual number of transmission layers is the maximum number of transmission layers indicated by the second field.
  • S232 is performed when the terminal device determines that it is not satisfied to send the SRS for the CB in the SCDD manner; and S233 is performed under the condition that the terminal device determines that the SRS for the CB is transmitted in the SCDD manner.
  • S232 Send the SRS for the CB to the network device in a non-SCDD manner.
  • S233 Determine whether the upper limit of the actual number of transmission layers is greater than or equal to 2.
  • the first configuration information is also used to indicate the number of antenna ports (ports) used for the SRS of the CB.
  • the terminal device performs steps S24 and S235 according to the number of antenna ports used for the SRS of the CB indicated by the first configuration information.
  • the number of ports indicated by the first configuration information may be indicated by a set of port identifiers (eg, may be names of ports) of the SRS for the CB.
  • the port set can be ⁇ port 1, port 2, port 4 ⁇ , that is, the number of ports that the terminal device can use for the SRS of the CB can be 1, 2, and 4.
  • the terminal device sends the SRS for CB to the network device in SCDD mode on a port of the SRS for CB using multiple antennas.
  • the terminal device uses multiple antennas on an SRS port for CB, and sends the SRS for CB to the network device in SCDD mode. It can be understood that the terminal device uses multiple antennas to send a single port for CB in SCDD mode. SRS. At this time, the SRS for CB sent by the terminal device on multiple antennas is the same.
  • the terminal device uses multiple antennas (in this case, the number of transmit antennas > the number of ports) on the N ports of the SRS for CB, and sends the SRS for CB in SCDD mode, where N is equal to the actual number of transmission layers upper limit of .
  • the terminal device uses multiple antennas on the N ports of the SRS for CB, and sends the SRS for CB to the network device in an SCDD manner.
  • the multiple antennas can be divided into N groups.
  • the terminal device transmits a single-port SRS for CB in SCDD mode on each antenna in each group of antennas.
  • the SRS for CB sent by the terminal device on each antenna in each group of antennas is the same.
  • the number of SRS ports used for CB is equal to the upper limit of the actual number of transmission layers.
  • the port number of the SRS used for CB can be understood as the actual port number.
  • Table 4 shows a scenario in which the newly added terminal device can send the SRS to the network device in the SCDD manner. Wherein, in the scenarios shown in Table 4, there is no case of multiplexing of SRS for CB and SRS for AS.
  • DFT-s-OFDM waveform can be represented by Enable, and the upper limit of the actual number of transmission layers is 1.
  • the CP-OFDM waveform cannot be represented (Disable), and the upper limit of the actual number of transmission layers is the maximum number of transmission layers indicated by the second field.
  • the number of transmitting antennas of the terminal device is 2, and the number of SRS ports configured by the network device for CB is 2.
  • the terminal device sends If the number of antennas (2) is equal to the number of ports (2), it can be understood that the actual number of transmitting antennas of the terminal device is 2.
  • the number of transmitting antennas of the terminal device is 4, and the number of ports configured by the network device is 4.
  • the number of transmitting antennas (4) of the terminal device is equal to the number of ports. (4), it can be understood that the actual number of transmitting antennas of the terminal device is 4. Among them, the actual number of transmitting antennas can be understood as sending the same SRS for CB at the same time as four antennas.
  • the terminal device actually has the transmission capability of 2T, but the network configuration is 1T4R due to RRC reconfiguration and other reasons, that is, the number of transmit antennas is one.
  • the number of SRS ports configured by the network device for CB is 2, and it is not changed to a single port following the 1T4R configuration.
  • the terminal device is configured so that the number of transmit antennas (1) is smaller than the SRS used for CB.
  • the actual number of transmitting antennas of the terminal device is 2.
  • the actual number of transmitting antennas can be understood as the actual number of transmitting antennas is 4, but the same SRS for CB is transmitted at the same time is 2 antennas.
  • the antenna rotation capability reported by the terminal equipment is 2T4R
  • the actual number of transmitting antennas of the terminal equipment is 2.
  • the network device configures the terminal device with 2 SRS ports for CB, and the configured maximum number of transmission layers is 1 or 2.
  • the configured network device communicates with the terminal device.
  • the adopted waveform is the DFT-s-OFDM waveform, and the upper limit of the actual number of transmission layers is 1, and the terminal device executes S235. That is, the terminal device transmits a single-port SRS for CB in SCDD mode on two transmit antennas. At this time, the terminal device simultaneously transmits the same SRS for CB on the two antennas.
  • the actual port number is 1.
  • the terminal device actually has the transmission capability of 2T, but the network configuration is 1T4R due to RRC reconfiguration and other reasons, that is, the number of transmit antennas of the terminal device is one.
  • the network device configures the terminal device with two SRS ports for CB, and the configured maximum number of transmission layers is 1.
  • the configured network device communicates with the terminal device. If the waveform is a DFT-s-OFDM waveform or a CP-OFDM waveform, the upper limit of the actual number of transmission layers is 1, and the terminal device executes S235.
  • the terminal device selects 2 transmit antennas among the 4 antennas, and transmits a single-port SRS in the SCDD mode on the 2 transmit antennas. At this time, the terminal device simultaneously transmits the same SRS for CB on the two antennas.
  • the actual port number is 1.
  • the antenna rotation capability reported by the terminal device is 4T4R
  • the actual number of transmitting antennas of the terminal device is 4.
  • the network device configures the port for the terminal device according to the antenna rotation capability reported by the terminal device.
  • the number is 4, and the maximum number of transmission layers can be 1, 2, or 4. If the waveform used for communication between the configured network device and the terminal device is the DFT-s-OFDM waveform, the upper limit of the actual number of transmission layers is 1.
  • the terminal device executes S235. That is, the terminal device transmits a single-port SRS for CB in SCDD mode on four antennas. At this time, the terminal device simultaneously transmits the same SRS for CB on 4 antennas.
  • the actual port number is 1.
  • the antenna rotation capability reported by the terminal equipment is 4T4R
  • the actual number of transmitting antennas of the terminal equipment is 4.
  • the network device configures the terminal device with a number of ports of 4, and the configured maximum number of transmission layers can be 1 or 2.
  • the configured network device and the terminal device communicate using the waveform DFT- s-OFDM waveform or CP-OFDM waveform.
  • the waveform used in the communication between the configured network device and the terminal device is the DFT-s-OFDM waveform or the waveform used in the communication between the configured network device and the terminal device is the CP-OFDM waveform, and the maximum number of transmission layers configured is 1
  • the upper limit of the actual number of transmission layers is 1, and the terminal device executes S235. That is, the terminal device transmits a single-port SRS for CB on four antennas in SCDD mode. At this time, the terminal device simultaneously transmits the same SRS for CB on four antennas.
  • the actual port number is 1.
  • the terminal device needs to Two different SRSs for CB are sent at the same time, for example, the SRS for CB may be SRS 1 and SRS 2, and the terminal device performs S236. That is, the terminal device selects 2 antennas among the 4 antennas, and sends the single-port SRS 1 in the SCDD mode on the 2 transmit antennas. At the same time, the terminal device sends a single-port SRS 2 in the SCDD mode on the remaining two antennas.
  • the terminal device simultaneously transmits the SRS for CB on 4 antennas, wherein the same SRS for CB is transmitted on 2 of the 4 antennas, and the same SRS for CB is transmitted on the remaining 2 of the 4 antennas.
  • SRS at CB the actual number of ports sent is 2.
  • the conditions for the terminal device to determine whether to use SCDD to send the SRS for the CB are different.
  • the terminal device when the terminal device determines that there is no multiplexing of the SRS for CB and the SRS for AS, the terminal device no longer uses the port number of the SRS for CB and the actual transmission of the terminal device.
  • the number of antennas is used to determine whether the terminal device adopts SCDD to transmit SRS for CB. Instead, it is determined whether the terminal device uses SCDD to send the SRS for CB through the upper limit of the actual number of transmission layers and the actual number of transmit antennas of the terminal device.
  • the SRS of the CB is sent by SCDD, which improves the transmit power.
  • the network device may also reconfigure the target parameters, and send the reconfigured target parameters to the terminal device, so that the terminal device communicates with the network device according to the reconfigured target parameters.
  • the target parameter includes at least one of the following: the SRS resource in the first configuration information, the number of ports in the first configuration information, whether there is multiplexing of SRS for CB and SRS for AS in the first configuration information or second configuration information.
  • the network device may periodically reconfigure the target parameters.
  • the network device may reconfigure the target parameters according to other parameters.
  • the other parameters include at least one of the following: signal strength of the terminal device or power consumption of the terminal device.
  • the network device may receive an auxiliary message reported by the terminal device, where the reported auxiliary message is used to request the network device to reconfigure the target parameter, so that the network device reconfigures the target parameter according to the auxiliary message.
  • the SRS transmission method of the embodiment of the present application is described in detail above with reference to FIG. 1 to FIG. 4 , and the apparatus of the embodiment of the present application is described in detail below with reference to FIG. 5 to FIG. 8 .
  • the apparatuses shown in FIGS. 5 to 8 can implement one or more steps in the method flow shown in FIG. 3 .
  • the processing module 510 in the communication device 500 shown in FIG. 5 may perform S230 in FIG. 3
  • the transceiver module 520 may perform S220 in FIG. 3
  • the processing module 710 in the communication apparatus 700 shown in FIG. 7 may perform S210 in FIG. 3
  • the transceiver module 720 may perform S230 in FIG. 3 .
  • FIG. 5 is a schematic diagram of a communication device according to an embodiment of the present application.
  • the communication device 500 shown in FIG. 5 includes a processing module 510 and a transceiver module 520 .
  • a transceiver module 520 configured to receive first configuration information and second configuration information sent by the network device, where the first configuration information is used to indicate SRS resources for CB and/or whether there is SRS for CB and SRS for AS multiplexing of the SRS, the second configuration information is used to indicate the waveform used by the network device and the terminal device to communicate, and the maximum number of transmission layers, the waveform includes discrete Fourier transform extended orthogonal frequency division complex Orthogonal frequency division multiplexing of CP-OFDM waveforms with DFT-s-OFDM waveforms and/or cyclic prefixes;
  • a processing module 510 configured to determine, according to the first configuration information, whether a first preset condition is met, where the first preset condition includes the absence of multiplexing of the SRS for CB and the SRS for AS;
  • the processing module 510 is further configured to determine, according to the second configuration information, whether a second preset condition is met, where the second preset condition includes that the upper limit of the actual transmission layer number is less than the actual transmission layer used by the terminal device for transmission.
  • the number of antennas, the upper limit of the actual number of transmission layers is determined according to the waveform and the maximum number of transmission layers;
  • the transceiver module 520 is further configured to send the SRS for CB to the network device in the SCDD manner.
  • the first configuration information is also used to indicate the number of antenna ports used for the SRS of the CB
  • the processing module 510 is also used to determine whether the upper limit of the actual number of transmission layers is greater than or equal to 2.
  • the transceiver module 520 is further configured to: when the upper limit of the actual transmission layer number is greater than or equal to 2, use multiple antennas on the N antenna ports of the SRS for CB, Send the SRS for CB to the network device in an SCDD manner, where N is equal to the upper limit of the actual number of transmission layers; or when the upper limit of the actual number of transmission layers is less than 2, use multiple The root antenna is on an antenna port of the SRS for the CB, and sends the SRS for the CB to the network device in an SCDD manner.
  • the upper limit of the actual number of transmission layers is 1.
  • the upper limit of the actual number of transmission layers is the maximum number of transmission layers.
  • the first configuration information is carried in an SRS configuration message.
  • the second configuration information is carried in a physical uplink shared channel PUSCH configuration message.
  • the maximum number of transmission layers is less than or equal to the minimum of the number of antenna ports for the SRS for CB and the number of transmit antennas, and the number of antenna ports for the SRS for CB is less than the number of transmit antennas .
  • the above-mentioned communication apparatus 500 may be a terminal device 60, wherein the function of the processing module 510 may be implemented by a processor in the terminal device, and the function of the transceiver module 520 may be implemented by the control circuit of the terminal device together with the antenna accomplish.
  • the function of the processing module 510 may be implemented by a processor in the terminal device
  • the function of the transceiver module 520 may be implemented by the control circuit of the terminal device together with the antenna accomplish.
  • FIG. 6 is a schematic structural diagram of a terminal device according to an embodiment of the present application.
  • the terminal device can be applied to the system shown in FIG. 1 to perform the functions of the terminal device in the foregoing method embodiments.
  • FIG. 6 only shows the main components of the terminal device.
  • the terminal device 60 includes a processor, a memory, a control circuit, an antenna, and an input and output device.
  • the processor is mainly used to process communication protocols and communication data, control the entire terminal device, execute software programs, and process data of the software programs, for example, to support the terminal device to perform the actions described in the above method embodiments.
  • the memory is mainly used to store software programs and data.
  • the control circuit is mainly used for the conversion of the baseband signal and the radio frequency signal and the processing of the radio frequency signal.
  • the control circuit together with the antenna can also be called a transceiver, which is mainly used to send and receive radio frequency signals in the form of electromagnetic waves.
  • Input and output devices such as touch screens, display screens, and keyboards, are mainly used to receive data input by users and output data to users.
  • the processor can read the software program in the storage unit, interpret and execute the instructions of the software program, and process the data of the software program.
  • the processor performs baseband processing on the data to be sent, and outputs the baseband signal to the radio frequency circuit.
  • the radio frequency circuit performs radio frequency processing on the baseband signal and sends the radio frequency signal through the antenna in the form of electromagnetic waves.
  • the radio frequency circuit receives the radio frequency signal through the antenna, converts the radio frequency signal into a baseband signal, and outputs the baseband signal to the processor, which converts the baseband signal into data and processes the data.
  • FIG. 6 only shows one memory and one processor. In an actual terminal device, there may be multiple processors and multiple memories.
  • the memory may also be referred to as a storage medium or a storage device, etc., which is not limited in this embodiment of the present application.
  • the processor may include a baseband processor and a central processing unit.
  • the baseband processor is mainly used to process communication protocols and communication data
  • the central processing unit is mainly used to control the entire terminal device, execute A software program that processes data from the software program.
  • the processor in FIG. 6 may integrate the functions of the baseband processor and the central processing unit.
  • the baseband processor and the central processing unit may also be independent processors, interconnected by technologies such as a bus.
  • a terminal device may include multiple baseband processors to adapt to different network standards, a terminal device may include multiple central processors to enhance its processing capability, and various components of the terminal device may be connected through various buses.
  • the baseband processor may also be expressed as a baseband processing circuit or a baseband processing chip.
  • the central processing unit can also be expressed as a central processing circuit or a central processing chip.
  • the function of processing the communication protocol and communication data may be built in the processor, or may be stored in the storage unit in the form of a software program, and the processor executes the software program to realize the baseband processing function.
  • FIG. 7 is a schematic diagram of a communication device according to another embodiment of the present application.
  • the communication apparatus 700 shown in FIG. 7 includes a processing module 710 and a transceiver module 720 .
  • a processing module 710 configured to configure first configuration information and second configuration information, where the first configuration information is used to indicate SRS resources for CB and/or whether there is a complex between SRS for CB and SRS for AS.
  • the second configuration information is used to indicate the waveform used by the network device and the terminal device for communication, and the maximum number of transmission layers, and the waveform includes discrete Fourier transform extended orthogonal frequency division multiplexing DFT-s - OFDM waveform and/or cyclic prefix orthogonal frequency division multiplexing CP-OFDM waveform;
  • a transceiver module 720 configured to send the first configuration information and the second configuration information to the terminal device, where the first configuration information is used by the terminal device to determine whether a first preset condition is met, the first configuration information A preset condition includes the absence of multiplexing of the SRS for CB and the SRS for AS, the second configuration information is used by the terminal device to determine whether the second preset condition is met, the second preset The conditions include that the upper limit of the actual number of transmission layers is less than the number of antennas actually used by the terminal device for transmission, and the upper limit of the actual number of transmission layers is determined according to the waveform and the maximum number of transmission layers;
  • the transceiver module 720 is further configured to receive the SRS for CB sent by the terminal device in a small cycle delay diversity SCDD manner, and the SRS for CB sent by the terminal device in a SCDD manner.
  • SRS is when the terminal device determines that the first preset condition and the second preset condition are satisfied.
  • the first configuration information is further used to indicate the number of antenna ports used for the SRS of the CB
  • the transceiver module 720 is further configured to: the upper limit value of the actual transmission layer number is greater than or equal to In the case of 2, receiving the SRS for CB sent by the terminal device in the SCDD mode on the N antenna ports of the SRS for CB using multiple antennas, where N is equal to the actual number of transmission layers or when the upper limit of the actual number of transmission layers is less than 2, receive the terminal equipment using multiple antennas on an antenna port for the SRS of the CB and send it in SCDD mode of the SRS for CB.
  • the upper limit of the actual number of transmission layers is 1.
  • the upper limit of the actual number of transmission layers is the maximum number of transmission layers.
  • the first configuration information is carried in an SRS configuration message.
  • the second configuration information is carried in a physical uplink shared channel PUSCH configuration message.
  • the maximum number of transmission layers is less than or equal to the minimum of the number of antenna ports for the SRS for CB and the number of transmit antennas, and the number of antenna ports for the SRS for CB is less than the number of transmit antennas .
  • the above-mentioned communication apparatus 700 may be a network device, such as the base station 80 below, wherein the function of the processing module 710 may be implemented by the processor 8022 in the base station, and the function of the receiving module 720 may be implemented by the base station 80 The RRU 801 implementation.
  • FIG. 8 is a schematic structural diagram of a network device according to an embodiment of the present application, such as a schematic structural diagram of a base station.
  • the base station can be applied to the system shown in FIG. 1 to perform the functions of the network device in the foregoing method embodiments.
  • the base station 80 may include one or more radio frequency units, such as a remote radio unit (remote radio unit, RRU) 801 and one or more baseband units (baseband unit, BBU) (also referred to as digital unit, digital unit, DU) 802.
  • RRU remote radio unit
  • BBU baseband unit
  • the RRU 801 may be referred to as a transceiver unit, a transceiver, a transceiver circuit, or a transceiver, etc., which may include at least one antenna 8011 and a radio frequency unit 8012.
  • the RRU 801 part is mainly used for transmitting and receiving radio frequency signals and converting radio frequency signals and baseband signals, for example, for sending the signaling messages described in the above embodiments to terminal equipment.
  • the part of the BBU 802 is mainly used to perform baseband processing, control the base station, and the like.
  • the RRU 801 and the BBU 802 may be physically set together, or may be physically set separately, that is, a distributed base station.
  • Described BBU 802 is the control center of base station, also can be called processing unit, is mainly used to complete baseband processing function, such as channel coding, multiplexing, modulation, spread spectrum and so on.
  • the BBU (processing unit) 802 may be used to control the base station to perform the operation procedures related to the network device in the foregoing method embodiments.
  • the BBU 802 may be composed of one or more single boards, and the multiple single boards may jointly support a wireless access network (such as an LTE network) with a single access indication, or may respectively support a wireless access network with different access standards.
  • Wireless access network (such as LTE network, 5G network or other network).
  • the BBU 802 also includes a memory 8021 and a processor 8022, and the memory 8021 is used to store necessary instructions and data.
  • the memory 8021 stores the corresponding relationship between the codebook index and the precoding matrix in the above embodiment.
  • the processor 8022 is configured to control the base station to perform necessary actions, for example, to control the base station to execute the operation flow of the network device in the foregoing method embodiments.
  • the memory 8021 and the processor 8022 may serve one or more single boards. That is to say, the memory and processor can be provided separately on each single board. It can also be that multiple boards share the same memory and processor. In addition, necessary circuits may also be provided on each single board.
  • the present application also provides a communication system, which includes the aforementioned one or more network devices, and one or more terminal devices.
  • the processor in the embodiments of the present application may be a central processing unit (Central Processing Unit, CPU), and the processor may also be other general-purpose processors, digital signal processors (digital signal processors, DSP), dedicated integrated Circuit (application specific integrated circuit, ASIC), off-the-shelf programmable gate array (field programmable gate array, FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc.
  • a general purpose processor may be a microprocessor or the processor may be any conventional processor or the like.
  • the memory in the embodiments of the present application may be volatile memory or non-volatile memory, or may include both volatile and non-volatile memory.
  • the non-volatile memory may be read-only memory (ROM), programmable read-only memory (PROM), erasable programmable read-only memory (EPROM), electrically programmable Erase programmable read-only memory (electrically EPROM, EEPROM) or flash memory.
  • Volatile memory may be random access memory (RAM), which acts as an external cache.
  • RAM random access memory
  • SRAM static random access memory
  • DRAM dynamic random access memory
  • DRAM synchronous dynamic random access memory
  • SDRAM synchronous dynamic random access memory
  • DDR SDRAM double data rate synchronous dynamic random access memory
  • enhanced SDRAM enhanced synchronous dynamic random access memory
  • SLDRAM synchronous connection dynamic random access memory Fetch memory
  • direct memory bus random access memory direct rambus RAM, DR RAM
  • the above embodiments may be implemented in whole or in part by software, hardware, firmware or any other combination.
  • the above-described embodiments may be implemented in whole or in part in the form of a computer program product.
  • the computer program product includes one or more computer instructions or computer programs. When the computer instructions or computer programs are loaded or executed on a computer, all or part of the processes or functions described in the embodiments of the present application are generated.
  • the computer may be a general purpose computer, special purpose computer, computer network, or other programmable device.
  • the computer instructions may be stored in or transmitted from one computer readable storage medium to another computer readable storage medium, for example, the computer instructions may be downloaded from a website site, computer, server or data center Transmission to another website site, computer, server or data center by wire (eg, infrared, wireless, microwave, etc.).
  • the computer-readable storage medium can be any available medium that can be accessed by a computer or a data storage device such as a server, a data center, or the like that contains a set of one or more available media.
  • the usable media may be magnetic media (eg, floppy disks, hard disks, magnetic tapes), optical media (eg, DVDs), or semiconductor media.
  • the semiconductor medium may be a solid state drive.
  • "indication” may include direct indication and indirect indication, and may also include explicit indication and implicit indication.
  • the information indicated by a certain information (such as the configuration information described above) is called the information to be indicated.
  • the information to be indicated In the specific implementation process, there are many ways to indicate the information to be indicated. For example, but not limited to, it is possible to directly indicate the information to be indicated. information, such as the information to be indicated itself or the index of the information to be indicated.
  • the information to be indicated may also be indirectly indicated by indicating other information, where there is an association relationship between the other information and the information to be indicated. It is also possible to indicate only a part of the information to be indicated, while other parts of the information to be indicated are known or agreed in advance.
  • the indication of specific information can also be implemented by means of a pre-agreed (for example, a protocol stipulated) arrangement order of various information, so as to reduce the indication overhead to a certain extent.
  • the "communication protocol” involved in the embodiments of this application may refer to standard protocols in the communication field, for example, may include LTE protocol, NR protocol, and related protocols applied in future communication systems, which are not limited in this application.
  • the size of the sequence numbers of the above-mentioned processes does not mean the sequence of execution, and the execution sequence of each process should be determined by its functions and internal logic, rather than the implementation process of the embodiments of the present application. constitute any limitation.
  • the disclosed system, apparatus and method may be implemented in other manners.
  • the apparatus embodiments described above are only illustrative.
  • the division of the units is only a logical function division. In actual implementation, there may be other division methods.
  • multiple units or components may be combined or Can be integrated into another system, or some features can be ignored, or not implemented.
  • the shown or discussed mutual coupling or direct coupling or communication connection may be through some interfaces, indirect coupling or communication connection of devices or units, and may be in electrical, mechanical or other forms.
  • the units described as separate components may or may not be physically separated, and 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 in this embodiment.
  • each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically alone, or two or more units may be integrated into one unit.
  • the functions, if implemented in the form of software functional units and sold or used as independent products, may be stored in a computer-readable storage medium.
  • the technical solution of the present application can be embodied in the form of a software product in essence, or the part that contributes to the prior art or the part of the technical solution.
  • the computer software product is stored in a storage medium, including Several instructions are used to cause a computer device (which may be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of the present application.
  • the aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (Read-Only Memory, ROM), random access memory (Random Access Memory, RAM), magnetic disk or optical disk and other media that can store program codes .

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Abstract

本申请实施例提供了一种SRS的传输方法及通信装置，该方法包括：接收第一配置信息和第二配置信息，第一配置信息用于指示用于CB的SRS资源和/或是否存在用于CB和用于AS的SRS的复用，第二配置信息用于指示最大传输层数和网络设备与终端设备进行通信所采用的波形；终端设备根据第一配置信息和第二配置信息，分别确定是否满足不存在用于CB和用于AS的SRS的复用的条件和实际传输层数的上限值小于终端设备实际用于发射的天线数的条件；在满足两个条件的情况下，终端设备以SCDD方式向网络设备发送用于CB的SRS。从而扩展了用于CB的SRS采用SCDD方式发送的场景。

Description

探测参考信号SRS传输方法及通信装置
本申请要求于2020年06月30日提交中国专利局、申请号为202010610142.5、申请名称为“探测参考信号SRS传输方法及通信装置”的中国专利申请的优先权，其全部内容通过引用结合在本申请中。
技术领域
本申请实施例涉及电子技术领域，尤其涉及一种SRS传输方法及通信装置。
背景技术
探测参考信号(sounding reference signal，SRS)是用于测量上行信道的一种参考信号。网络设备可以基于终端设备发送的SRS进行上行信道测量，以获取上行信道的信道状态信息(channel state information，CSI)，以便于调度上行资源。在某些情况下，终端设备需要通过天线切换的方式来发送SRS。例如，在一些具有信道互易性特点的系统中，网络设备可通过上行信道测量获得的上行信道的CSI来估计下行信道的CSI，以便调度下行资源。SRS的功能通常包括：确定基于码本(code book，CB)的PUSCH的传输方式，确定基于非码本(non code book，NCB)的PUSCH的传输方式，天线切换(antenna switching，AS)功能以及用于管理波束等。
现有技术中，物理上行共享信道(physical uplink shared channel，PUSCH)、物理随机接入信道(physical random access channel，PRACH)、物理上行链路控制信道(physical uplink control channel，PUCCH)、SRS等信道均可以采用SCDD方式提升发射功率。目前用于CB的SRS，在不存在用于CB的SRS和用于AS的SRS的复用，以及用于CB的SRS的天线端口数数小于终端设备的实际发射天线数的情况下，可以采用SCDD的方式发送用于CB的SRS。但是，在不存在用于CB的SRS和用于AS的SRS的复用和天线端口数大于或等于2以及发射天线数等于天线端口数的情况下，此时，通信系统不能够唯一确定是单流模式还是多流模式，终端设备不确定用于CB的SRS是否可以采用SCDD的方式进行发送。因此，传统的用于CB的SRS采用SCDD方式发送的场景比较局限。
发明内容
本申请提供一种SRS传输方法及通信装置，从而扩展了用于CB的SRS采用SCDD的方式发送的场景，提升了发射功率。
第一方面，提供了一种SRS传输方法，包括：终端设备接收网络设备发送的第一配置信息和第二配置信息，所述第一配置信息用于指示用于码本CB的SRS资源和/或是否存在用于CB的SRS和用于天线切换AS的SRS的复用，所述第二配置信息用于指示所述网络设备和终端设备进行通信所采用的波形，以及最大传输层数，所述波形包括离散傅里叶变换扩展正交频分复用DFT-s-OFDM波形和/或循环前缀正交频分复用CP-OFDM波形； 所述终端设备根据所述第一配置信息，确定是否满足第一预设条件，所述第一预设条件包括不存在所述用于CB的SRS和用于AS的SRS的复用；所述终端设备根据所述第二配置信息，确定是否满足第二预设条件，所述第二预设条件包括实际传输层数的上限值小于所述终端设备实际用于发射的天线数，所述实际传输层数的上限值是根据所述波形和所述最大传输层数确定的；在满足所述第一预设条件和所述第二预设条件的情况下，所述终端设备以小循环延时分集SCDD的方式向所述网络设备发送所述用于CB的SRS。
其中，存在用于CB的SRS和用于AS的SRS的复用可以理解为该SRS具有CB功能，同时，该SRS还具有AS功能。
最大传输层数可以理解为通信系统确定的实际传输层数的上限值。
其中，实际传输层数的上限值可以根据网络设备和终端设备进行通信所采用的波形，以及最大传输层数确定的。
在第二配置信息指示的网络设备和终端设备进行通信所采用的波形是DFT-s-OFDM波形的情况下，隐含了实际传输层数的上限值只能取1。此时，第二配置信息中指示的最大传输层数可以大于1，但是实际传输层数的上限值还是1。
在第二配置信息指示的网络设备和终端设备进行通信所采用的波形是CP-OFDM波形的情况下，实际传输层数的上限值是第二配置信息指示的最大传输层数。
其中，SCDD可以理解为同一时间，用多根天线发送相同的信号。
在一种可实现的方式中，在第一配置信息中指示了是否存在用于CB的SRS和用于AS的SRS的复用的情况下，终端设备可以根据第一配置信息确定是否存在用于CB的SRS和用于AS的SRS的复用。
在另一种可实现的方式中，在第一配置信息中未指示是否存在用于CB的SRS和用于AS的SRS的复用的情况下，终端设备可以根据第一配置信息确定SRS资源，并根据SRS资源自己确定是否存在用于CB的SRS和用于AS的SRS的复用。
其中，终端设备可以通过判断用于CB的SRS的时频资源和用于AS的SRS的时频资源是否是同一时频资源，来确定用于CB的SRS和用于AS的SRS是否复用。在用于CB的SRS的时频资源和用于AS的SRS的时频资源有重叠时频资源的情况下，终端设备确定用于CB的SRS和用于AS的SRS是复用；在用于CB的SRS的时频资源和用于AS的SRS的时频资源没有重叠时频资源的情况下，终端设备确定用于CB的SRS和用于AS的SRS没有复用。
在本申请实施例中，终端设备根据网络设备配置的第一配置信息，确定是否存在用于CB的SRS和用于AS的SRS的复用，并根据网络设备配置的第二配置信息确定实际传输层数的上限值，从而终端设备在确定不存在用于CB的SRS和用于AS的SRS的复用，以及实际传输层数的上限值小于终端设备实际用于发射的天线数的情况下，以SCDD的方式向网络设备发送用于CB的SRS。从而扩展了用于CB的SRS采用SCDD方式发送的场景，提升了发射功率。
结合第一方面，在第一方面的某些实现方式中，所述第一配置信息还用于指示所述用于CB的SRS的天线端口数，所述终端设备以小循环延时分集SCDD的方式向所述网络设备发送用于CB的SRS包括：所述终端设备判断所述实际传输层数的上限值是否大于或等于2；在所述实际传输层数的上限值大于或等于2的情况下，所述终端设备用多根天线 在N个所述用于CB的SRS的天线端口上，以SCDD方式向所述网络设备发送所述用于CB的SRS，其中，N等于实际传输层数的上限值；或在所述实际传输层数的上限值小于2的情况下，所述终端设备用多根天线在一个用于所述CB的SRS的天线端口上，以SCDD方式向所述网络设备发送所述用于CB的SRS。
示例性地，终端设备用多根天线在一个用于CB的SRS的天线端口上，以SCDD方式向网络设备发送该用于CB的SRS可以理解为终端设备用多根天线，以SCDD方式发送单天线端口的用于CB的SRS。此时，终端设备在多根天线上发送的用于CB的SRS是相同的。
在一种可实现的方式中，终端设备用多根天线在N个用于CB的SRS的天线端口上，以SCDD方式向网络设备发送该用于CB的SRS可以为：多根天线分为N组，终端设备在每组天线中的每根天线上，以SCDD的方式发送单天线端口的用于CB的SRS。此时，终端设备在每组天线中的每根天线上发送的用于CB的SRS是相同的。
在本申请实施例中，终端设备判断实际传输层数的上限值是否大于或等于2；在实际传输层数的上限值大于或等于2的情况下，终端设备用多根天线在N个所述用于CB的SRS的天线端口上，以SCDD方式向网络设备发送所述用于CB的SRS，其中，N等于实际传输层数的上限值；或在实际传输层数的上限值小于2的情况下，终端设备用多根天线在一个用于CB的SRS的天线端口上，以SCDD方式向所述网络设备发送用于CB的SRS，从而扩展了用于CB的SRS采用SCDD方式发送的场景，提升了发射功率。
结合第一方面，在第一方面的某些实现方式中，在所述波形是所述DFT-s-OFDM波形的情况下，所述实际传输层数的上限值为1。
结合第一方面，在第一方面的某些实现方式中，在所述波形是所述CP-OFDM波形的情况下，所述实际传输层数的上限值为所述最大传输层数。
结合第一方面，在第一方面的某些实现方式中，所述第一配置信息承载在SRS配置消息中。
结合第一方面，在第一方面的某些实现方式中，所述第二配置信息承载在物理上行共享信道PUSCH配置消息中。
可选地，PUSCH配置消息中的传输预编码字段可以指示所述波形。
可选地，PUSCH配置消息中的最大秩字段可以指示最大传输层数。
结合第一方面，在第一方面的某些实现方式中，所述最大传输层数小于或等于所述用于CB的SRS的天线端口数和发射天线数中的最小值，所述用于CB的SRS的天线端口数小于所述发射天线数。
第二方面，提供了一种SRS的传输方法，包括：网络设备配置第一配置信息和第二配置信息，所述第一配置信息用于指示用于码本CB的SRS资源和/或是否存在用于CB的SRS和用于天线切换AS的SRS的复用，所述第二配置信息用于指示所述网络设备和终端设备进行通信所采用的波形，以及最大传输层数，所述波形包括离散傅里叶变换扩展正交频分复用DFT-s-OFDM波形和/或循环前缀正交频分复用CP-OFDM波形；所述网络设备向所述终端设备发送所述第一配置信息和所述第二配置信息，所述第一配置信息用于所述终端设备确定是否满足第一预设条件，所述第一预设条件包括不存在所述用于CB的SRS和用于AS的SRS的复用，所述第二配置信息用于所述终端设备确定是否满足第二预 设条件，所述第二预设条件包括实际传输层数的上限值小于所述终端设备实际用于发射的天线数，所述实际传输层数的上限值是根据所述波形和所述最大传输层数确定的；所述网络设备接收所述终端设备，以小循环延时分集SCDD的方式发送的所述用于CB的SRS，所述终端设备以SCDD的方式发送的所述用于CB的SRS是在所述终端设备确定满足所述第一预设条件和所述第二预设条件的情况下。
可选地，网络设备可以通过终端设备上报的天线轮发能力消息，来确定第一配置信息和第二配置信息。
其中，天线轮发能力可以理解为终端设备的天线中接收天线的个数以及发射天线的个数。
可选地，网络设备可以通过判断用于CB的SRS的时频资源和用于AS的SRS的时频资源是否是同一时频资源，来确定用于CB的SRS和用于AS的SRS是否复用。在网络设备确定用于CB的SRS和用于AS的SRS是否复用之后，网络设备可以通过第一配置信息指示是否存在用于CB的SRS和用于AS的SRS的复用。
其中，在用于CB的SRS的时频资源和用于AS的SRS的时频资源有重叠时频资源的情况下，网络设备确定用于CB的SRS和用于AS的SRS是复用；在用于CB的SRS的时频资源和用于AS的SRS的时频资源没有重叠时频资源的情况下，网络设备确定用于CB的SRS和用于AS的SRS没有复用。
可选地，网络设备还可以重新配置目标参数，将重新配置的目标参数发送给终端设备，从而终端设备根据重新配置的目标参数，确定是否满足预设条件。其中，目标参数包括以下至少一项：第一配置信息中的SRS资源、第一配置信息中的port数、第一配置信息中是否存在用于CB的SRS和用于AS的SRS的复用或第二配置信息。
在一些可能实现的方式中，网络设备可以周期性地重新配置目标参数。
在另一些可能实现的方式中，网络设备可以根据其他参数，重新配置目标参数。示例性地，其他参数包括以下至少一项：终端设备的信号强度或终端设备的功耗。
在又一些可能实现的方式中，网络设备可以接收终端设备上报的辅助消息，该上报的辅助消息用于请求网络设备重新配置目标参数，从而网络设备根据该辅助消息，重新配置目标参数。
在本申请实施例中，首先，网络设备配置第一配置信息和第二配置信息，第一配置信息用于CB的SRS资源和/或是否存在用于CB的SRS和用于天线切换AS的SRS的复用，第二配置信息用于指示所述网络设备和终端设备进行通信所采用的波形，以及最大传输层数。其次，网络设备向终端设备发送第一配置信息和第二配置信息，该第一配置信息和第二配置信息用于终端设备确定是否满足不存在用于CB的SRS和用于AS的SRS的复用的条件，该第二配置信息用于终端设备确定是否满足实际传输层数的上限值小于所述终端设备用于发射的天线数；最后，在满足两个条件的情况下，网络设备接收终端设备以SCDD的方式发送的用于CB的SRS。从而扩展了用于CB的SRS采用SCDD方式发送的场景，提升了发射功率。
结合第二方面，在第二方面的某些实现方式中，所述第一配置信息还用于指示所述用于CB的SRS的天线端口数，所述网络设备接收所述终端设备，以小循环延时分集SCDD的方式发送的所述用于CB的SRS包括：在所述实际传输层数的上限值大于或等于2的情 况下，所述网络设备接收所述终端设备用多根天线在N个所述用于CB的SRS的天线端口上，以SCDD方式发送的所述用于CB的SRS，其中，N等于实际传输层数的上限值；或在所述实际传输层数的上限值小于2的情况下，所述网络设备接收所述终端设备用多根天线在一个用于所述CB的SRS的天线端口上，以SCDD方式发送的所述用于CB的SRS。
结合第二方面，在第二方面的某些实现方式中，在所述波形是所述DFT-s-OFDM波形的情况下，所述实际传输层数的上限值为1。
结合第二方面，在第二方面的某些实现方式中，在所述波形是所述CP-OFDM波形的情况下，所述实际传输层数的上限值为所述最大传输层数。
结合第二方面，在第二方面的某些实现方式中，所述第一配置信息承载在SRS配置消息中。
结合第二方面，在第二方面的某些实现方式中，所述第二配置信息承载在物理上行共享信道PUSCH配置消息中。
结合第二方面，在第二方面的某些实现方式中，所述最大传输层数小于或等于所述用于CB的SRS的天线端口数和发射天线数中的最小值，所述用于CB的SRS的天线端口数小于所述发射天线数。
第三方面，提供了一种终端设备，包括：收发模块，用于接收网络设备发送的第一配置信息和第二配置信息，所述第一配置信息用于指示用于码本CB的SRS资源和/或是否存在用于CB的SRS和用于天线切换AS的SRS的复用，所述第二配置信息用于指示所述网络设备和终端设备进行通信所采用的波形，以及最大传输层数，所述波形包括离散傅里叶变换扩展正交频分复用DFT-s-OFDM波形和/或循环前缀正交频分复用CP-OFDM波形；处理模块，用于根据所述第一配置信息，确定是否满足第一预设条件，所述第一预设条件包括不存在所述用于CB的SRS和用于天线切换AS的SRS的复用；所述处理模块，还用于根据所述第二配置信息，确定是否满足第二预设条件，所述第二预设条件包括实际传输层数的上限值小于所述终端设备实际用于发射的天线数，所述实际传输层数的上限值是根据所述波形和所述最大传输层数确定的；在满足所述第一预设条件和所述第二预设条件的情况下，所述收发模块，还用于以小循环延时分集SCDD的方式向所述网络设备发送所述用于CB的SRS。
结合第三方面，在第三方面的某些实现方式中，所述第一配置信息还用于指示用于CB的SRS的天线端口数，所述处理模块，还用于判断所述实际传输层数的上限值是否大于或等于2；所述收发模块，还用于：在所述实际传输层数的上限值大于或等于2的情况下，用多根天线在N个所述用于CB的SRS的天线端口上，以SCDD方式向所述网络设备发送所述用于CB的SRS，其中，N等于实际传输层数的上限值；或在所述实际传输层数的上限值小于2的情况下，用多根天线在一个用于所述CB的SRS的天线端口上，以SCDD方式向所述网络设备发送所述用于CB的SRS。
结合第三方面，在第三方面的某些实现方式中，在所述波形是所述DFT-s-OFDM波形的情况下，所述实际传输层数的上限值为1。
结合第三方面，在第三方面的某些实现方式中，在所述波形是所述CP-OFDM波形的情况下，所述实际传输层数的上限值为所述最大传输层数。
结合第三方面，在第三方面的某些实现方式中，所述第一配置信息承载在SRS配置 消息中。
结合第三方面，在第三方面的某些实现方式中，所述第二配置信息承载在物理上行共享信道PUSCH配置消息中。
结合第三方面，在第三方面的某些实现方式中，所述最大传输层数小于或等于所述用于CB的SRS的天线端口数和发射天线数中的最小值，所述用于CB的SRS的天线端口数小于所述发射天线数。
第四方面，提供了一种网络设备，包括处理模块，用于配置第一配置信息和第二配置信息，所述第一配置信息用于指示用于码本CB的SRS资源和/或是否存在用于CB的SRS和用于天线切换AS的SRS的复用，所述第二配置信息用于指示所述网络设备和终端设备进行通信所采用的波形，以及最大传输层数，所述波形包括离散傅里叶变换扩展正交频分复用DFT-s-OFDM波形和/或循环前缀正交频分复用CP-OFDM波形；收发模块，用于向所述终端设备发送所述第一配置信息和所述第二配置信息，所述第一配置信息用于所述终端设备确定是否满足第一预设条件，所述第一预设条件包括不存在所述用于CB的SRS和用于天线切换AS的SRS的复用，所述第二配置信息用于所述终端设备确定是否满足第二预设条件，所述第二预设条件包括实际传输层数的上限值小于所述终端设备实际用于发射的天线数，所述实际传输层数的上限值是根据所述波形和所述最大传输层数确定的；所述收发模块，还用于接收所述终端设备，以小循环延时分集SCDD的方式发送的所述用于CB的SRS，所述终端设备以SCDD的方式发送的所述用于CB的SRS是在所述终端设备确定满足所述第一预设条件和所述第二预设条件的情况下。
结合第四方面，在第四方面的某些实现方式中，所述第一配置信息还用于指示用于CB的SRS的天线端口数，所述收发模块，还用于：在所述实际传输层数的上限值大于或等于2的情况下，接收所述终端设备用多根天线在N个所述用于CB的SRS的天线端口上，以SCDD方式发送的所述用于CB的SRS，其中，N等于实际传输层数的上限值；或在所述实际传输层数的上限值小于2的情况下，接收所述终端设备用多根天线在一个用于所述CB的SRS的天线端口上，以SCDD方式发送的所述用于CB的SRS。
结合第四方面，在第四方面的某些实现方式中，在所述波形是所述DFT-s-OFDM波形的情况下，所述实际传输层数的上限值为1。
结合第四方面，在第四方面的某些实现方式中，在所述波形是所述CP-OFDM波形的情况下，所述实际传输层数的上限值为所述最大传输层数。
结合第四方面，在第四方面的某些实现方式中，所述第一配置信息承载在SRS配置消息中。
结合第四方面，在第四方面的某些实现方式中，所述第二配置信息承载在物理上行共享信道PUSCH配置消息中。
结合第四方面，在第四方面的某些实现方式中，所述最大传输层数小于或等于所述用于CB的SRS的天线端口数和发射天线数中的最小值，所述用于CB的SRS的天线端口数小于所述发射天线数。
第五方面，提供一种通信装置，所述装置可以是终端设备，也可以是终端设备内的芯片。所述装置可以包括处理单元和收发单元。当所述装置是终端设备时，所述处理单元可以是处理器，所述收发单元可以是收发器；所述终端设备还可以包括存储单元，所述存储 单元可以是存储器；所述存储单元用于存储指令，所述处理单元执行所述存储单元所存储的指令，以使所述终端设备执行第一方面中的方法。当所述装置是终端设备内的芯片时，所述处理单元可以是处理器，所述收发单元可以是输入/输出接口、管脚或电路等；所述处理单元执行存储单元所存储的指令，以使所述终端设备执行第一方面中的方法，所述存储单元可以是所述芯片内的存储单元(例如，寄存器、缓存等)，也可以是所述终端设备内的位于所述芯片外部的存储单元(例如，只读存储器、随机存取存储器等)。
第六方面，提供一种通信装置，所述装置可以是网络设备，也可以是网络设备内的芯片。所述装置可以包括处理单元和收发单元。当所述装置是网络设备时，所述处理单元可以是处理器，所述收发单元可以是收发器；所述网络设备还可以包括存储单元，所述存储单元可以是存储器；所述存储单元用于存储指令，所述处理单元执行所述存储单元所存储的指令，以使所述网络设备执行第二方面中的方法。当所述装置是网络设备内的芯片时，所述处理单元可以是处理器，所述收发单元可以是输入/输出接口、管脚或电路等；所述处理单元执行存储单元所存储的指令，以使所述网络设备执行第二方面中的方法，所述存储单元可以是所述芯片内的存储单元(例如，寄存器、缓存等)，也可以是所述网络设备内的位于所述芯片外部的存储单元(例如，只读存储器、随机存取存储器等)。
第七方面，提供了一种计算机程序产品，所述计算机程序产品包括：计算机程序代码，当所述计算机程序代码在计算机上运行时，使得计算机执行上述各方面中的方法。
需要说明的是，上述计算机程序代码可以全部或者部分存储在第一存储介质上，其中第一存储介质可以与处理器封装在一起的，也可以与处理器单独封装，本申请实施例对此不作具体限定。
第八方面，提供了一种计算机可读介质，所述计算机可读介质存储有程序代码，当所述计算机程序代码在计算机上运行时，使得计算机执行上述各方面中的方法。
附图说明
图1是本申请实施例提供的方法的通信系统100的示意图。
图2是现有技术中将SCDD预编码的示意性流程图。
图3是本申请实施例提供的一种SRS传输方法的示意性流程图。
图4是本申请实施例提供的终端设备和网络设备进行通信的示意性流程图。
图5是本申请实施例提供的通信设备的示意图。
图6是本申请实施例提供的一种终端设备的结构示意图。
图7是本申请另一实施例提供的通信设备的示意图。
图8是本申请实施例提供的一种网络设备的结构示意图。
具体实施方式
下面将结合附图，对本申请中的技术方案进行描述。
本申请实施例的技术方案可以应用于各种通信系统，例如：全球移动通信(global system for mobile communications，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，WCDMA)系统、通用分组无线业务(general packet radio service，GPRS)、长期演进(long term evolution， LTE)系统、LTE频分双工(frequency division duplex，FDD)系统、LTE时分双工(time division duplex，TDD)、通用移动通信系统(universal mobile telecommunication system，UMTS)、全球互联微波接入(worldwide interoperability for microwave access，WiMAX)通信系统、未来的第五代(5th generation，5G)系统或新无线(new radio，NR)等。
为便于理解本申请实施例，首先结合图1详细说明适用于本申请实施例提供的方法的通信系统。图1示出了适用于本申请实施例提供的方法的通信系统100的示意图。如图所示，该通信系统100可以包括至少一个网络设备，如图1中所示的5G系统中的基站(gNB)；该通信系统100还可以包括至少一个终端设备，如图1中所示的用户设备(user equipment，UE)1至UE 6。网络设备与各终端设备之间可以通过无线链路通信。例如，网络设备可以向终端设备发送配置信息，终端设备可以基于该配置信息向网络设备发送上行数据；又例如，网络设备可以向终端设备发送下行数据。因此，图1中的gNB和UE 1至UE 6可以构成一个通信系统。
该通信系统100中的终端设备，如，UE 4至UE 6，也可以构成一个通信系统。例如，UE 4可以控制UE 5和UE 6执行相应的指令。本申请对此不作限定。
本申请实施例中的终端设备可以指用户设备、接入终端、用户单元、用户站、移动站、移动台、远方站、远程终端、移动设备、用户终端、终端、无线通信设备、用户代理或用户装置。终端设备还可以是蜂窝电话、无绳电话、会话启动协议(session initiation protocol，SIP)电话、无线本地环路(wireless local loop，WLL)站、个人数字助理(personal digital assistant，PDA)、具有无线通信功能的手持设备、计算设备或连接到无线调制解调器的其它处理设备、车载设备、可穿戴设备，未来5G网络中的终端设备或者未来演进的公用陆地移动通信网络(public land mobile network，PLMN)中的终端设备等，本申请实施例对此并不限定。
作为示例而非限定，在本申请实施例中，该终端设备还可以是可穿戴设备。可穿戴设备也可以称为穿戴式智能设备，是应用穿戴式技术对日常穿戴进行智能化设计、开发出可以穿戴的设备的总称，如眼镜、手套、手表、服饰及鞋等。可穿戴设备即直接穿在身上，或是整合到用户的衣服或配件的一种便携式设备。可穿戴设备不仅仅是一种硬件设备，更是通过软件支持以及数据交互、云端交互来实现强大的功能。广义穿戴式智能设备包括功能全、尺寸大、可不依赖智能手机实现完整或者部分的功能，例如：智能手表或智能眼镜等，以及只专注于某一类应用功能，需要和其它设备如智能手机配合使用，如各类进行体征监测的智能手环、智能首饰等。
此外，在本申请实施例中，终端设备还可以是物联网(internet of things，IoT)系统中的终端设备，IoT是未来信息技术发展的重要组成部分，其主要技术特点是将物品通过通信技术与网络连接，从而实现人机互连，物物互连的智能化网络。
在本申请实施例中，IOT技术可以通过例如窄带(narrow band)NB技术，做到海量连接，深度覆盖，终端省电。例如，NB只包括一个资源块(resource bloc，RB)，即，NB的带宽只有180KB。要做到海量接入，必须要求终端在接入上是离散的，根据本申请实施例的通信方法，能够有效解决IOT技术海量终端在通过NB接入网络时的拥塞问题。
本申请实施例中的网络设备可以是用于与终端设备通信的设备，该网络设备可以是全球移动通信(global system for mobile communications，GSM)系统或码分多址(code division  multiple access，CDMA)中的基站(base transceiver station，BTS)，也可以是宽带码分多址(wideband code division multiple access，WCDMA)系统中的基站(NodeB，NB)，还可以是LTE系统中的演进型基站(evolved NodeB，eNB或eNodeB)，还可以是云无线接入网络(cloud radio access network，CRAN)场景下的无线控制器，或者该网络设备可以为中继站、接入点、车载设备、可穿戴设备以及未来5G网络中的网络设备或者未来演进的PLMN网络中的网络设备等，可以是WLAN中的接入点(access point，AP)，可以是新型无线系统(new radio，NR)系统中的gNB本申请实施例并不限定。
在一些部署中，gNB可以包括集中式单元(centralized unit，CU)和DU。gNB还可以包括射频单元(radio unit，RU)。CU实现gNB的部分功能，DU实现gNB的部分功能，比如，CU实现无线资源控制(radio resource control，RRC)，分组数据汇聚层协议(packet data convergence protocol，PDCP)层的功能，DU实现无线链路控制(radio link control，RLC)、媒体接入控制(media access control，MAC)和物理(physical，PHY)层的功能。由于RRC层的信息最终会变成PHY层的信息，或者，由PHY层的信息转变而来，因而，在这种架构下，高层信令，如RRC层信令，也可以认为是由DU发送的，或者，由DU+CU发送的。可以理解的是，网络设备可以为CU节点、或DU节点、或包括CU节点和DU节点的设备。此外，CU可以划分为接入网(radio access network，RAN)中的网络设备，也可以将CU划分为核心网(core network，CN)中的网络设备，本申请对此不做限定。
另外，在本申请实施例中，网络设备为小区提供服务，终端设备通过该小区使用的传输资源(例如，频域资源，或者说，频谱资源)与网络设备进行通信，该小区可以是网络设备(例如基站)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。
此外，LTE系统或5G系统中的载波上可以同时有多个小区同频工作，在某些特殊场景下，也可以认为上述载波与小区的概念等同。例如在载波聚合(carrier aggregation，CA)场景下，当为UE配置辅载波时，会同时携带辅载波的载波索引和工作在该辅载波的辅小区的小区标识(cell indentification，Cell ID)，在这种情况下，可以认为载波与小区的概念等同，比如UE接入一个载波和接入一个小区是等同的。
核心网设备可以与多个网络设备连接，用于控制网络设备，并且，可以将从网络侧(例如，互联网)接收到的数据分发至网络设备。
其中，以上列举的终端设备、网络设备和核心网设备的功能和具体实现方式仅为示例性说明，本申请并未限定于此。
在本申请实施例中，终端设备或网络设备包括硬件层、运行在硬件层之上的操作系统层，以及运行在操作系统层上的应用层。该硬件层包括中央处理器(central processing unit，CPU)、内存管理单元(memory management unit，MMU)和内存(也称为主存)等硬件。该操作系统可以是任意一种或多种通过进程(process)实现业务处理的计算机操作系统，例如，
Figure PCTCN2021082659-appb-000001
操作系统、
Figure PCTCN2021082659-appb-000002
操作系统、
Figure PCTCN2021082659-appb-000003
操作系统、
Figure PCTCN2021082659-appb-000004
操作系统或
Figure PCTCN2021082659-appb-000005
操作系统等。该应用层包含浏览器、通讯录、文字处理软件、即时通信软件等应用。并且， 本申请实施例并未对本申请实施例提供的方法的执行主体的具体结构特别限定，只要能够通过运行记录有本申请实施例的提供的方法的代码的程序，以根据本申请实施例提供的方法进行通信即可，例如，本申请实施例提供的方法的执行主体可以是终端设备或网络设备，或者，是终端设备或网络设备中能够调用程序并执行程序的功能模块。
还应理解，图1仅为便于理解而示例的简化示意图，该通信系统100中还可以包括其他网络设备或者还可以包括其他终端设备，图1中未予以画出。
为便于理解本申请实施例，首先对下文中涉及的几个概念做简单说明。
1、探测参考信号(sounding reference signal，SRS)
一方面，网络设备可以基于终端发送的SRS估计上行信道的信道状态，以调度终端设备传输PUSCH。另一方面，对于具有信道互易性的通信系统而言，例如时分双工(time division duplexing，TDD)系统，基于信道互易性，SRS也可被网络设备用于估计下行信道的信道状态。
2、天线端口(antenna port)
天线端口是逻辑上的概念，一个天线端口可以是一个物理发射天线，也可以是多个物理发射天线的合并。在这两种情况下，接收机(receiver)通常不会去分解来自同一个天线端口的信号，因为从接收机的角度来看，不管信号是由单个物理发射天线形成的，还是由多个物理发射天线合并而成的，这个天线端口对应的参考信号(reference signal，RS)就定义了这个天线端口。上述RS为SRS时，网络设备可以根据终端设备发送的SRS得到这个天线端口的信道估计。
3、SRS资源(resource)以及SRS资源集(resource set)
通常一个SRS资源集中包含用于传输SRS的一个或多个SRS资源。
目前通信协议(例如，NR协议)中，为SRS配置了多种功能。传输具有不同功能的SRS的资源，通常是基于上述SRS资源集以及SRS资源的框架进行资源配置的。由于各个功能对SRS的需求不同，导致的SRS资源集以及SRS资源的配置也有所差异。
具体而言SRS的功能通常包括：确定基于码本(code book，CB)的PUSCH的传输方式，确定基于非码本(non code book，NCB)的PUSCH的传输方式，天线切换(antenna switching，AS)功能以及用于管理波束等。
SRS的天线切换功能用于TDD中终端设备的发射机(Transmitter，Tx)的天线(或称“发射天线”)的数量少于接收机(Receiver，Rx)的天线(或称“接收天线”)的数量的场景，比如说终端设备的射频(Radio Frequency，RF)通道造价高，导致终端设备的上行发送通道是受限的。由于终端设备的发射天线的数量少于接收天线的数量，在网络设备通过SRS测量接收天线对应的下行信道的信道状态时，终端设备需要以天线切换(或称天线轮发)的方式的通过发射天线向网络设备发送接收天线对应的SRS，以便网络设备可以估计所有接收天线对应的信道状态。即对于用于天线切换的SRS资源集中的SRS资源，每次通过一个SRS资源发送能发送的Tx通道，然后切换到另外的Rx通道，发送剩下Rx通道的SRS资源，这些SRS资源在不同的正交频分复用(orthogonal frequency division multiplexing，OFDM)符号上发送。通过SRS资源在不同天线上的轮发，使基站获取所有Rx通道的信道状态信息。
下文分别以1T2R的终端设备、2T4R的终端设备以及1T4R的终端设备为例，介绍具 有“天线切换”功能的SRS资源集以及SRS资源的配置方式。
对于1T2R的终端设备而言，有1个发射天线和2个接收天线。网络设备为终端设备所配置的SRS资源集内包含2个SRS资源，每个SRS资源对应一个天线端口。终端设备每次轮询一个Rx天线，在该Tx天线上发送该Rx天线对应的SRS。如此，终端设备需要在上述两个SRS资源把2个Rx天线对应的SRS发完，网络设备才能获取到2个Rx天线对应的信道的信道状态。
对于2T4R的终端设备而言，有2个发射天线和4个接收天线，网络设备为终端设备配置的SRS资源集内包含2个SRS资源，每个SRS资源对应2个天线端口。终端设备每次可以轮询2个Rx天线，对于同一个SRS资源，可对应不同的天线端口，2个Tx上均发送该SRS资源。终端设备需要在2个SRS资源上发完4个Rx天线对应的SRS，才能使网络设备获取到4个Rx对应的信道的信道状态。
对于1T4R的终端设备而言，可以由有两种资源配置方式：
方式一，对于周期、半静态的SRS，网络设备为终端设备配置一个SRS资源集，该SRS资源集内有4个SRS资源，每个SRS资源分别对应4个天线端口。终端设备每次轮询一个Rx天线，终端设备通过一个Tx天线，在该Rx天线对应SRS resource上发送SRS。终端设备需要在4个SRS资源上将4个Rx天线对应的SRS资源发完，才能使网络设备获取到4个Rx对应的信道的信道状态。
方式二，对于非周期的SRS，有2种轮询方式：1、网络设备为终端设备配置2个SRS资源集，每个SRS资源集内有2个SRS资源。2、网络设备为终端设备配置2个SRS资源集，其中，一个SRS资源集内有一个SRS资源，另一个SRS资源集内有3个SRS资源。
应理解，由于终端设备轮询不同接收天线所发送SRS时，需要在SRS资源之间预留一段的时间，供终端设备轮询到下一个接收天线，即SRS资源之间需要预留一定的保护间隔。通常，每个SRS资源占用1个OFDM符号，SRS资源之间的保护间隔为1个OFDM符号。
4、小循环延时分集(small cyclic delay diversity，SCDD)
SCDD可以理解为同一时间，用多根天线发送“相同”的信号。该SCDD可以提升总的发射功率。例如，若用2根天线同时发送A信号，可以提升1倍的发射功率，即3dB。又例如，若用4根天线同时发送A信号，可以提升4倍的发射功率，即6dB。
PUSCH、物理随机接入信道(physical random access channel，PRACH)、物理上行链路控制信道(physical uplink control channel，PUCCH)、SRS等信道均可以采用SCDD方式提升发射功率。
SCDD的编码过程可以用如下公式表达：
y＝W×D(k)×Ux
其中，W是预编码矩阵，维度为Ntx×Ntx'。Ntx是发射天线数，例如，Ntx可以是2、4、8、32、64或256等等。Ntx'是用于预编码的子空间的维度，例如，Ntx'可以是2，当Ntx等于Ntx'时，W可以是Ntx×Ntx的单位矩阵。
其中，D(k)是频调相关的循环延迟矩阵，维度为Ntx'×Ntx'，其中k是资源元素(resource element，RE)索引。
其中，Ux是流虚拟化矩阵，维度为Ntx×R，例如，可以是从Ntx'×Ntx'的离散傅里 叶变换(discrete fourier transform，DFT)矩阵中选取前R列，R是秩或者流数。当秩R＝1时，D(k)＝diag{1，e -j2πkd}，其中，d为延迟值(delay)，d可被选取为非常小(例如，d可以是0.1毫秒或0.2毫秒)，并且通常比循环前缀(cyclic prefix，CP)长度小得多，使得在应用SCDD后的有效延迟扩展仍然在该CP内，U＝[1 1] T，于是，W×D(k)×Ux＝[1，e -j2πkd] T，SCDD相当于是按子载波索引添加了延时相移e -j2πkd的发射分集。
如图2所示，提供了通信系统或设备将SCDD预编码操作应用于DFT扩展OFDM(DFT-s-OFDM)波形的示例。具体地，可以包括以下步骤：步骤1，通信系统或设备对一个或多个码字执行加扰；步骤2，将加扰后的码字进行调制；步骤3，将调制后的码字进行DFT；步骤4，将DFT后的码字进行SCDD预编码；步骤5，将SCDD预编码的信号进行RE映射；步骤6，将映射后的信号进行快速傅里叶逆变换(inverse fast fourier transform，IFFT)；步骤7：将IFFT的信号通过相应的天线进行传送。
6、波形自适应
在NR系统中，引入了CP-OFDM波形，该CP-OFDM波形用于上行发送。该CP-OFDM波形在资源利用率、分配灵活度比较高。但是该CP-OFDM波形的峰均比较高，导致相比于DFT-s-OFDM波形来说，CP-OFDM波形的最大功率回退(max power reduction，MPR)比较大。
如下表1所示，是协议38.101中规定的MPR。
如表1所示，在DFT-s-OFDM波形和CP-OFDM波形采用的调制方式都是QPSK的情况下，在内部RB分配(Inner RB)下，CP-OFDM波形的MPR比DFT-s-OFDM波形的MPR大1.5dB；在外部RB分配(Outer RB)下，CP-OFDM波形的MPR比DFT-s-OFDM波形的MPR大2dB。
表1
Figure PCTCN2021082659-appb-000006
Figure PCTCN2021082659-appb-000007
波形自适应切换指的是网络设备根据终端设备的信号的质量，将终端设备的上行波形在DFT-s-OFDM波形和CP-OFDM波形之间进行切换。例如，在远点(信号较差的地点，一般会采用的调制方式是QPSK)时，采用DFT-s-OFDM波形将有1.5dB到2dB的最大功率收益。
如表2所示，是DFT-s-OFDM波形与CP-OFDM波形的优缺点。
表2
Figure PCTCN2021082659-appb-000008
结合表1和表2可得，DFT-s-OFDM波形的优点(例如，对于远点，DFT-s-OFDM波形的峰均比较小，使得DFT-s-OFDM波形最大功率少回退1.5-2dB)可以掩盖DFT-s-OFDM波形的缺点。
在通信系统中，目前用于CB的SRS，在满足以下条件A和条件B的情况下，可以采用SCDD的方式发送用于CB的SRS。
条件A，不存在用于CB的SRS和用于AS的SRS的复用；条件B，用于CB的SRS的port数小于终端设备的实际发射天线数。
其中，实际发射天线数可理解为实际上行发送天线数。
存在用于CB的SRS和用于AS的SRS的复用可以理解为该SRS具有CB功能，同时，该SRS还具有AS功能。
如表3所示，为现有技术中，可以采用SCDD方式，终端设备向网络设备发送用于CB的SRS的示例。
表3
Figure PCTCN2021082659-appb-000009
Figure PCTCN2021082659-appb-000010
例如，如表3中序号为5所示，网络设备配置的用于CB的SRS的port数为2，大于轮发模式1T4R所能支持的最大port数。此时，可能是因为终端设备支持1T4R/2T4R能力，网络设备侧修改轮发模式为1T4R，但是网络设备侧并未相应修改SRS配置消息中的port数。
又例如，如表3中的序号为7所示，轮发模式是1T4R，网络设备配置的用于CB的SRS的port数为1，但是终端可以有大于1根天线的发射能力，所以也能采用SCDD。
从表3中可以看出，在不存在用于CB的SRS和用于AS的SRS的复用，port数等于1以及发射天线数大于1的情况下，终端设备确定满足上述条件A和条件B。此时，通信系统是单流模式，则终端设备确定用于CB的SRS可以采用SCDD的方式进行发送。但是，在不存在用于CB的SRS和用于AS的SRS的复用，port数大于或等于2以及发射天线数等于port数的情况下，此时，通信系统不能够唯一确定是单流模式还是多流模式，因此，终端设备不确定用于CB的SRS是否可以采用SCDD的方式进行发送。
因此，本申请提供了一种SRS传输方法，可以根据通信系统实际传输层数的上限值，确定用于CB的SRS是否可以采用SCDD的方式进行发送，从而扩宽了用于CB的SRS采用SCDD方式发送的场景。
下面结合附图介绍本申请实施例提供的SRS传输方法。
参见图3，为本申请实施例提供的SRS传输方法200的示意性流程图。
步骤210，网络设备配置第一配置信息和第二配置信息，第一配置信息用于指示用于CB的SRS资源和/或是否存在用于CB的SRS和用于天线切换AS的SRS的复用，第二配置信息用于指示网络设备和终端设备进行通信所采用的波形，以及最大传输层数，该波形包括DFT-s-OFDM波形和/或CP-OFDM波形。
可选地，网络设备可以通过判断用于CB的SRS的时频资源和用于AS的SRS的时频资源是否是同一时频资源，来确定用于CB的SRS和用于AS的SRS是否复用。在网络设 备确定用于CB的SRS和用于AS的SRS是否复用之后，网络设备可以通过第一配置信息指示是否存在用于CB的SRS和用于AS的SRS的复用。
其中，在用于CB的SRS的时频资源和用于AS的SRS的时频资源有重叠时频资源的情况下，网络设备确定用于CB的SRS和用于AS的SRS是复用；在用于CB的SRS的时频资源和用于AS的SRS的时频资源没有重叠时频资源的情况下，网络设备确定用于CB的SRS和用于AS的SRS没有复用。
示例性地，第一配置信息指示的SRS资源可以是通过SRS资源的标识来指示。
在一种可实现的方式中，第二配置信息可以通过两个字段分别指示网络设备和终端设备进行通信所采用的波形，以及最大传输层数。示例性地，第二配置信息可以包括第一字段和第二字段，所述第一字段用于指示网络设备和终端设备进行通信所采用的波形，所述第二字段用于指示最大传输层数。
在另一种可实现的方式中，第二配置信息可以通过一个字段指示网络设备和终端设备进行通信所采用的波形，以及最大传输层数。例如，第二配置信息可以包括第三字段，所述第三字段用于指示网络设备和终端设备进行通信所采用的波形，以及最大传输层数。
以下，是以第二配置信息通过两个字段分别指示网络设备和终端设备进行通信所采用的波形，以及最大传输层数为例进行描述。
示例性地，第一字段可以分别用能(Enable)和不能(Disable)来指示网络设备和终端设备进行通信所采用的波形。在一个实施例中，第一字段可以用Disable指示网络设备和终端设备进行通信所采用的波形是DFT-s-OFDM波形，以及第一字段可以用Disable指示网络设备和终端设备进行通信所采用的波形是CP-OFDM波形。在另一个实施例中，第一字段可以用Enable指示网络设备和终端设备进行通信所采用的波形是CP-OFDM波形，以及第一字段用Disable指示网络设备和终端设备进行通信所采用的波形是DFT-s-OFDM波形。
以下，是以第一字段用Enable指指示网络设备和终端设备进行通信所采用的波形是DFT-s-OFDM波形，以及第一字段用Disable指示网络设备和终端设备进行通信所采用的波形是CP-OFDM波形为例进行描述。
网络设备和终端设备之间形成的通信系统可以分为单流模式和多流模式。流指的是数据流。单和多指的是有多少路数据在同时传输。数据传输可以包括普通单天线传输，分集传输和多输入多输出(multi input multi output，MIMO)空间复用。其中，普通的单天线传输，数据流只有一路，所以是单流模式。分集传输，虽然数据由多路在传输，但两路数据流传输的顺序不同，内容相同，所以对于终端和设备来说，还是单流模式。MIMO空间复用利用多个天线，同时传输不同的内容，对于终端设备来说，相当于一次有多路数据流，所以是多流模式。
例如，终端设备的发送天线有天线A和天线B，需要发送信号A和信号B。若在t1时间，终端设备通过天线A发送信号A，在t2时间，终端设备再次通过天线A上发送信号B，此时为单流模式。若在t1时间，终端设备通过天线A分别发送信号A，并通过天线B分别发送信号B，此时为双/多流模式。
可选地，网络设备(或者通信系统)可以根据信道矩阵的秩(Rank)，来确定当前的信道质量是适合单流还是多流。在Rank＝1的情况下，当前的信道质量支持单流模式；在 Rank≥2的情况下，当前的信道质量是支持多流模式。
可选地，网络设备还可以根据第二配置信息中网络设备指示的最大传输层数和信道矩阵的实际秩数的最小值，来确定前的信道质量是适合单流还是多流，并确定实际传输秩数/层数。
为了方便描述，以下将实际传输秩数/层数描述为实际传输层数。
其中，第二配置信息指示的最大传输层数可以理解为通信系统确定的实际传输层数的上限值。
在网络设备和终端设备进行通信所采用的波形是DFT-s-OFDM波形的情况下，隐含实际传输层数的上限值只能取1。此时，在第二字段中指示的最大传输层数可以大于1，但是实际传输层数的上限值还是1。
可选地，实际传输层数的上限值可以通过第二字段指示的最大传输层数和第一字段隐含的最大传输层数的最小值确定。
其中，实际传输层数是由信道矩阵的秩和实际传输层数的上限值共同决定的。其中，信道矩阵的秩是变化的。
其中，最大传输层数≤min(SRS port数，发射天线数)，SRS port数≤发射天线数。
示例性地，第一配置信息可以承载在SRS配置消息(SRS-Config)。
示例性地，第二配置信息可以承载在PUSCH配置消息(PUSCH-Config)。此时，第一字段可以是传输预编码(transformPrecoder)字段。第二字段可以是最大秩(maxRank)字段。
在一些实施例中，第一配置信息和第二配置信息可以是分别承载在两个消息中。在另一些实施例中，第一配置信息和第二配置信息可以是承载在同一个消息的不同字段中。
具体地，网络设备可以接收终端设备发送的天线轮发能力消息，并根据终端设备发送的天线轮发能力消息，来确定第一配置信息和第二配置信息。
其中，天线轮发能力可以理解为终端设备的天线中接收天线的个数以及发射天线的个数。
S220，网络设备向终端设备发送第一配置信息和第二配置信息。相应地，终端设备接收网络设备发送的第一配置信息和第二配置信息。
S230，终端设备根据第一配置信息和第二配置信息，和网络设备进行通信。
具体地，如图4所示，S230可以包括S231至S235。
S231，终端设备确定是否满足采用SCDD的方式发送用于CB的SRS的条件。
其中，采用SCDD方式发送用于CB的SRS的条件包括：条件1，不存在用于CB的SRS和用于AS的SRS的复用；条件2，实际传输层数的上限值小于终端设备的实际发射天线数。
在一种可实现的方式中，在第一配置信息中指示了是否存在用于CB的SRS和用于AS的SRS的复用的情况下，终端设备可以根据第一配置信息可以确定SRS资源、port数、以及是否存在用于CB的SRS和用于AS的SRS的复用。
在另一种可实现的方式中，在第一配置信息中未指示是否存在用于CB的SRS和用于AS的SRS的复用的情况下，终端设备根据第一配置信息确定SRS资源，从而终端设备自己确定是否存在用于CB的SRS和用于AS的SRS的复用。
其中，终端设备可以通过判断用于CB的SRS的时频资源和用于AS的SRS的时频资源是否是同一时频资源，来确定用于CB的SRS和用于AS的SRS是否复用。在用于CB的SRS的时频资源和用于AS的SRS的时频资源有重叠时频资源的情况下，终端设备确定用于CB的SRS和用于AS的SRS是复用；在用于CB的SRS的时频资源和用于AS的SRS的时频资源没有重叠时频资源的情况下，终端设备确定用于CB的SRS和用于AS的SRS没有复用。
终端设备根据第二配置信息，确定网络设备和终端设备进行通信所采用的波形以及最大传输层数，从而确定实际传输层数的上限值。
在第一字段指示的网络设备和终端设备进行通信所采用的波形是DFT-s-OFDM波形的情况下，实际传输层数的上限值是1。
在第一字段指示的网络设备和终端设备进行通信所采用的波形是CP-OFDM波形的情况下，实际传输层数的上限值是第二字段指示的最大传输层数。
在终端设备确定不满足采用SCDD方式发送用于CB的SRS的条件下，执行S232；在终端设备确定满足采用SCDD方式发送用于CB的SRS的条件下，执行S233。
S232，以非SCDD方式向网络设备发送用于CB的SRS。
S233，判断实际传输层数的上限值是否大于或等于2。
在实际传输层数的上限值等于1的情况下，执行S234。在实际传输层数的上限值大于或等于2的情况下，执行S235。
可选地，第一配置信息中还用于指示用于CB的SRS的天线端口(port)数。终端设备根据第一配置信息指示的用于CB的SRS的天线端口数，执行步骤S24和S235。
示例性地，第一配置信息指示的port数可以是通过用于CB的SRS的port标识(例如，可以是port的名称)的集合来指示。例如，port集合可以是{port 1，port 2，port 4}，即终端设备可以用于CB的SRS的port数可以是1，2，4。
S234，终端设备用多根天线在一个用于CB的SRS的port上，以SCDD方式向网络设备发送该用于CB的SRS。
终端设备用多根天线在一个用于CB的SRS的port上，以SCDD方式向网络设备发送该用于CB的SRS可以理解为终端设备用多根天线，以SCDD方式发送单port的用于CB的SRS。此时，终端设备在多根天线上发送的用于CB的SRS是相同的。
S235，终端设备用多根天线(此时，发射天线数>port数)在N个用于CB的SRS的port上，以SCDD方式发送该用于CB的SRS，其中，N等于实际传输层数的上限值。
在一种可实现的方式中，终端设备用多根天线在N个用于CB的SRS的port上，以SCDD方式向网络设备发送该用于CB的SRS的可以为多根天线分为N组，终端设备在每组天线中的每根天线上，以SCDD的方式发送单port的用于CB的SRS。此时，终端设备在每组天线中的每根天线上发送的用于CB的SRS是相同的。
无论是S234还是S235，用于CB的SRS的port数都等于实际传输层数的上限值。
其中，在S234和S235中，用于CB的SRS的port数可以理解为实发port数。
与表3相比，表4是新增的终端设备可以采用SCDD的方式向网络设备发送SRS的场景。其中，在表4中所示的场景中都不存在用于CB的SRS和用于AS的SRS的复用的情况。
表4
Figure PCTCN2021082659-appb-000011
如表4所示，能(Enable)表示DFT-s-OFDM波形，实际传输层数的上限值为1。不能(Disable)表示CP-OFDM波形，实际传输层数的上限值为第二字段指示的最大传输层数。
例如，如表4中序号为16、17、22以及23所示，终端设备的发送天线数是2根，网络设备配置的用于CB的SRS的port数是2个，此时，终端设备发送天线数(2个)等于port数(2个)，则可以理解为终端设备的实际发送天线数是2根。
又例如，如表4中序号为20和21所示，终端设备的发送天线数是4根，网络设备配置的port数是4个，此时，终端设备发送天线数(4根)等于port数(4个)，则可以理解为终端设备的实际发送天线数为4根。其中，实际发送天线数可以理解为同时发送同一个用于CB的SRS是4根天线。
又例如，如表4中序号为18和19所示，终端设备实际具备2T的发送能力，但是由于RRC重配等原因网络配置为1T4R，即发射天线数是1根。同时，网络设备配置的用于CB的SRS的port数是2个，并未跟随1T4R配置改配为单port，此时，终端设备被配置为发射天线数(1根)小于用于CB的SRS的port数(2个)，此时，可以理解为终端设备的实际发送天线数为2根。其中，实际发送天线数可以理解为实际发送天线数是4根，但是同时发送同一个用于CB的SRS是2根天线。
例如，表4中序号16所示，终端设备上报的天线轮发能力为2T4R，终端设备的实际发射天线数为2根。网络设备根据终端设备上报的天线轮发能力，给终端设备配置的用于CB的SRS的port数为2个，配置的最大传输层数是1或2，配置的网络设备和终端设备进行通信所采用的波形是DFT-s-OFDM波形，则实际传输层数的上限值为1，则终端设备 执行S235。即终端设备在2根发射天线上，以SCDD的方式发送单port的用于CB的SRS。此时，终端设备在2根天线上同时发送相同的用于CB的SRS。另外的，实发port数为1。
例如，表4中序号19所示，终端设备实际具备2T的发送能力，但是由于RRC重配等原因网络配置为1T4R，即终端设备的发射天线数为1根。网络设备根据终端设备上报的天线轮发能力，给终端设备配置的用于CB的SRS的port数为2个，配置的最大传输层数是1，配置的网络设备和终端设备进行通信所采用的波形是DFT-s-OFDM波形或CP-OFDM波形，则实际传输层数的上限值为1，终端设备执行S235。即终端设备在4根天线中选取2根发射天线，并在该2根发射天线上，以SCDD的方式发送单port的SRS。此时，终端设备在2根天线上同时发送相同的用于CB的SRS。另外的，实发port数为1。
例如，表4中序号20所示，终端设备上报的天线轮发能力为4T4R，终端设备的实际发送天线数为4根，网络设备根据终端设备上报的天线轮发能力，给终端设备配置的port数为4，配置的最大传输层数可以是1、2或4，如果配置的网络设备和终端设备进行通信所采用的波形是DFT-s-OFDM波形，则实际传输层数的上限值为1，终端设备执行S235。即终端设备在4根天线上，以SCDD的方式发送单port的用于CB的SRS。此时，终端设备在4根天线上同时发送相同的用于CB的SRS。另外的，实发port数为1。
例如，表4中序号21所示，终端设备上报的天线轮发能力为4T4R，终端设备的实际发送天线数为4根。网络设备根据终端设备上报的天线轮发能力，给终端设备配置的port数为4，配置的最大传输层数可以是1或2，配置的网络设备和终端设备进行通信所采用的波形是DFT-s-OFDM波形或CP-OFDM波形。
在配置的网络设备和终端设备进行通信所采用的波形是DFT-s-OFDM波形或者在配置的网络设备和终端设备进行通信所采用的波形是CP-OFDM波形，配置的最大传输层数是1的情况下，则实际传输层数的上限值为1，终端设备执行S235。即终端设备在4根天线上，以SCDD的方式发送单port的用于CB的SRS，此时，终端设备在4根天线上同时发送相同的用于CB的SRS。另外的，实发port数为1。
在配置的网络设备和终端设备进行通信所采用的波形是CP-OFDM波形，配置的最大传输层数是2的情况下，则实际传输层数的上限值为2，此时，终端设备需要同时发送两个不同的用于CB的SRS，例如，用于CB的SRS可以是SRS 1和SRS 2，终端设备执行S236。即终端设备在4根天线中选取2根天线，并在该2根发射天线上，以SCDD的方式发送单port的SRS 1。同时，终端设备在剩下的2根天线上，以SCDD的方式发送单port的SRS 2。此时，终端设备在4根天线上同时发送用于CB的SRS，其中，4根中的2根天线上发送相同的用于CB的SRS，且4根中的剩下的2根上相同的用于CB的SRS。另外的，实发port数为2。
本申请提供的实施例与现有技术最大的不同之处在于：终端设备判断是否采用SCDD的方式发送用于CB的SRS的条件是不相同的。在本申请实施例中，在终端设备确定不存在用于CB的SRS和用于AS的SRS的复用的情况下，终端设备不再根据用于CB的SRS的port数和终端设备的实际发射天线数，去确定终端设备是否采用SCDD的方式去发送用于CB的SRS。而是通过实际传输层数的上限值和终端设备的实际发射天线数，去确定终端设备是否用SCDD的方式去发送用于CB的SRS，从而相对于现有技术而言，扩展了用于CB的SRS采用SCDD方式发送的场景，提升了发射功率。
可选地，网络设备还可以重新配置目标参数，将重新配置的目标参数发送给终端设备，从而终端设备根据重新配置的目标参数，与网络设备进行通信。其中，目标参数包括以下至少一项：第一配置信息中的SRS资源、第一配置信息中的port数、第一配置信息中是否存在用于CB的SRS和用于AS的SRS的复用或第二配置信息。
在一些可能实现的方式中，网络设备可以周期性地重新配置目标参数。
在另一些可能实现的方式中，网络设备可以根据其他参数，重新配置目标参数。示例性地，其他参数包括以下至少一项：终端设备的信号强度或终端设备的功耗。
在又一些可能实现的方式中，网络设备可以接收终端设备上报的辅助消息，该上报的辅助消息用于请求网络设备重新配置目标参数，从而网络设备根据该辅助消息，重新配置目标参数。
上文结合图1至图4详细描述了本申请实施例的SRS的传输方法，下面结合图5至图8，详细描述本申请实施例的装置。应理解，图5至图8所示的装置能够实现图3所示的方法流程中的一个或者多个的步骤。为避免重复，在此不再详细赘述。例如，图5所示的通信设备500中的处理模块510可以执行图3中的S230，收发模块520可以执行图3中的S220。图7所示的通信装置700中的处理模块710可以执行图3中的S210，收发模块720可以执行图3中的S230。
图5是本申请实施例的通信设备的示意图，图5所示的通信设备500包括：处理模块510和收发模块520。
收发模块520，用于接收网络设备发送的第一配置信息和第二配置信息，所述第一配置信息用于指示用于CB的SRS资源和/或是否存在用于CB的SRS和用于AS的SRS的复用，所述第二配置信息用于指示所述网络设备和终端设备进行通信所采用的波形，以及最大传输层数，所述波形包括离散傅里叶变换扩展正交频分复用DFT-s-OFDM波形和/或循环前缀正交频分复用CP-OFDM波形；
处理模块510，用于根据所述第一配置信息，确定是否满足第一预设条件，所述第一预设条件包括不存在所述用于CB的SRS和用于AS的SRS的复用；
处理模块510，还用于根据所述第二配置信息，确定是否满足第二预设条件，所述第二预设条件包括实际传输层数的上限值小于所述终端设备实际用于发射的天线数，所述实际传输层数的上限值是根据所述波形和所述最大传输层数确定的；
在满足预设条件的情况下，所述收发模块520，还用于以SCDD的方式向所述网络设备发送所述用于CB的SRS。
可选地，所述第一配置信息还用于指示所述用于CB的SRS的天线端口数，所述处理模块510，还用于判断所述实际传输层数的上限值是否大于或等于2；所述收发模块520，还用于：在所述实际传输层数的上限值大于或等于2的情况下，用多根天线在N个所述用于CB的SRS的天线端口上，以SCDD方式向所述网络设备发送所述用于CB的SRS，其中，N等于实际传输层数的上限值；或在所述实际传输层数的上限值小于2的情况下，用多根天线在一个用于所述CB的SRS的天线端口上，以SCDD方式向所述网络设备发送所述用于CB的SRS。
可选地，在所述波形是DFT-s-OFDM波形的情况下，所述实际传输层数的上限值为1。
可选地，在所述波形是CP-OFDM波形的情况下，所述实际传输层数的上限值为所述 最大传输层数。
可选地，所述第一配置信息承载在SRS配置消息中。
可选地，所述第二配置信息承载在物理上行共享信道PUSCH配置消息中。
可选地，所述最大传输层数小于或等于所述用于CB的SRS的天线端口数和发射天线数中的最小值，所述用于CB的SRS的天线端口数小于所述发射天线数。
在一种可能的实现方式中，上述通信装置500可以为终端设备60，其中处理模块510的功能可以由终端设备中的处理器实现，收发模块520的功能可以通过终端设备的控制电路与天线一起实现。下文结合图6介绍本申请实施例的终端设备的结构。
图6是本申请实施例的一种终端设备的结构示意图。该终端设备可适用于图1所示出的系统中，执行上述方法实施例中终端设备的功能。为了便于说明，图6仅示出了终端设备的主要部件。如图6所示，终端设备60包括处理器、存储器、控制电路、天线以及输入输出装置。处理器主要用于对通信协议以及通信数据进行处理，以及对整个终端设备进行控制，执行软件程序，处理软件程序的数据，例如用于支持终端设备执行上述方法实施例中所描述的动作。存储器主要用于存储软件程序和数据。控制电路主要用于基带信号与射频信号的转换以及对射频信号的处理。控制电路和天线一起也可以叫做收发器，主要用于收发电磁波形式的射频信号。输入输出装置，例如触摸屏、显示屏，键盘等主要用于接收用户输入的数据以及对用户输出数据。
当终端设备开机后，处理器可以读取存储单元中的软件程序，解释并执行软件程序的指令，处理软件程序的数据。当需要通过无线发送数据时，处理器对待发送的数据进行基带处理后，输出基带信号至射频电路，射频电路将基带信号进行射频处理后将射频信号通过天线以电磁波的形式向外发送。当有数据发送到终端设备时，射频电路通过天线接收到射频信号，将射频信号转换为基带信号，并将基带信号输出至处理器，处理器将基带信号转换为数据并对该数据进行处理。
本领域技术人员可以理解，为了便于说明，图6仅示出了一个存储器和一个处理器。在实际的终端设备中，可以存在多个处理器和多个存储器。存储器也可以称为存储介质或者存储设备等，本申请实施例对此不做限定。
作为一种可选的实现方式，处理器可以包括基带处理器和中央处理器，基带处理器主要用于对通信协议以及通信数据进行处理，中央处理器主要用于对整个终端设备进行控制，执行软件程序，处理软件程序的数据。图6中的处理器可以集成基带处理器和中央处理器的功能，本领域技术人员可以理解，基带处理器和中央处理器也可以是各自独立的处理器，通过总线等技术互联。本领域技术人员可以理解，终端设备可以包括多个基带处理器以适应不同的网络制式，终端设备可以包括多个中央处理器以增强其处理能力，终端设备的各个部件可以通过各种总线连接。所述基带处理器也可以表述为基带处理电路或者基带处理芯片。所述中央处理器也可以表述为中央处理电路或者中央处理芯片。对通信协议以及通信数据进行处理的功能可以内置在处理器中，也可以以软件程序的形式存储在存储单元中，由处理器执行软件程序以实现基带处理功能。
图7是本申请另一实施例的通信设备的示意图，图7所示的通信装置700包括：处理模块710和收发模块720。
处理模块710，用于配置第一配置信息和第二配置信息，所述第一配置信息用于指示 用于CB的SRS资源和/或是否存在用于CB的SRS和用于AS的SRS的复用，所述第二配置信息用于指示所述网络设备和终端设备进行通信所采用的波形，以及最大传输层数，所述波形包括离散傅里叶变换扩展正交频分复用DFT-s-OFDM波形和/或循环前缀正交频分复用CP-OFDM波形；
收发模块720，用于向所述终端设备发送所述第一配置信息和所述第二配置信息，所述第一配置信息用于所述终端设备确定是否满足第一预设条件，所述第一预设条件包括不存在所述用于CB的SRS和用于AS的SRS的复用，所述第二配置信息用于所述终端设备确定是否满足第二预设条件，所述第二预设条件包括实际传输层数的上限值小于所述终端设备实际用于发射的天线数，所述实际传输层数的上限值是根据所述波形和所述最大传输层数确定的；
所述收发模块720，还用于接收所述终端设备，以小循环延时分集SCDD的方式发送的所述用于CB的SRS，所述终端设备以SCDD的方式发送的所述用于CB的SRS是在所述终端设备确定满足所述第一预设条件和所述第二预设条件的情况下。
可选地，所述第一配置信息还用于指示所述用于CB的SRS的天线端口数，所述收发模块720，还用于：在所述实际传输层数的上限值大于或等于2的情况下，接收所述终端设备用多根天线在N个所述用于CB的SRS的天线端口上，以SCDD方式发送的所述用于CB的SRS，其中，N等于实际传输层数的上限值；或在所述实际传输层数的上限值小于2的情况下，接收所述终端设备用多根天线在一个用于所述CB的SRS的天线端口上，以SCDD方式发送的所述用于CB的SRS。
可选地，在所述波形是DFT-s-OFDM波形的情况下，所述实际传输层数的上限值为1。
可选地，在所述波形是CP-OFDM波形的情况下，所述实际传输层数的上限值为所述最大传输层数。
可选地，所述第一配置信息承载在SRS配置消息中。
可选地，所述第二配置信息承载在物理上行共享信道PUSCH配置消息中。
可选地，所述最大传输层数小于或等于所述用于CB的SRS的天线端口数和发射天线数中的最小值，所述用于CB的SRS的天线端口数小于所述发射天线数。
在一种可能的实现方式中，上述通信装置700可以为网络设备，例如下文中的基站80，其中处理模块710的功能可以由基站中的处理器8022实现，接收模块720的功能可以通过基站80的RRU 801实现。下文结合图8介绍本申请实施例的网络设备的结构。
图8是本申请实施例的一种网络设备的结构示意图，如可以为基站的结构示意图。如图8所示，该基站可应用于如图1所示的系统中，执行上述方法实施例中网络设备的功能。基站80可包括一个或多个射频单元，如远端射频单元(remote radio unit，RRU)801和一个或多个基带单元(baseband unit，BBU)(也可称为数字单元，digital unit，DU)802。所述RRU 801可以称为收发单元、收发机、收发电路、或者收发器等等，其可以包括至少一个天线8011和射频单元8012。所述RRU 801部分主要用于射频信号的收发以及射频信号与基带信号的转换，例如用于向终端设备发送上述实施例中所述的信令消息。所述BBU 802部分主要用于进行基带处理，对基站进行控制等。所述RRU 801与BBU 802可以是物理上设置在一起，也可以物理上分离设置的，即分布式基站。
所述BBU 802为基站的控制中心，也可以称为处理单元，主要用于完成基带处理功 能，如信道编码，复用，调制，扩频等等。例如所述BBU(处理单元)802可以用于控制基站执行上述方法实施例中关于网络设备的操作流程。
在一个实例中，所述BBU 802可以由一个或多个单板构成，多个单板可以共同支持单一接入指示的无线接入网(如LTE网)，也可以分别支持不同接入制式的无线接入网(如LTE网，5G网或其他网)。所述BBU 802还包括存储器8021和处理器8022，所述存储器8021用于存储必要的指令和数据。例如存储器8021存储上述实施例中的码本索引与预编码矩阵的对应关系。所述处理器8022用于控制基站进行必要的动作，例如用于控制基站执行上述方法实施例中关于网络设备的操作流程。所述存储器8021和处理器8022可以服务于一个或多个单板。也就是说，可以每个单板上单独设置存储器和处理器。也可以是多个单板共用相同的存储器和处理器。此外每个单板上还可以设置有必要的电路。
本申请还提供一种通信系统，其包括前述的一个或多个网络设备，和，一个或多个终端设备。
应理解，在本申请实施例中的处理器可以是中央处理单元(Central Processing Unit，CPU)，该处理器还可以是其他通用处理器、数字信号处理器(digital signal processor，DSP)、专用集成电路(application specific integrated circuit，ASIC)、现成可编程门阵列(field programmable gate array，FPGA)或者其他可编程逻辑器件、分立门或者晶体管逻辑器件、分立硬件组件等。通用处理器可以是微处理器或者该处理器也可以是任何常规的处理器等。
还应理解，本申请实施例中的存储器可以是易失性存储器或非易失性存储器，或可包括易失性和非易失性存储器两者。其中，非易失性存储器可以是只读存储器(read-only memory，ROM)、可编程只读存储器(programmable ROM，PROM)、可擦除可编程只读存储器(erasable PROM，EPROM)、电可擦除可编程只读存储器(electrically EPROM，EEPROM)或闪存。易失性存储器可以是随机存取存储器(random access memory，RAM)，其用作外部高速缓存。通过示例性但不是限制性说明，许多形式的随机存取存储器(random access memory，RAM)可用，例如静态随机存取存储器(static RAM，SRAM)、动态随机存取存储器(DRAM)、同步动态随机存取存储器(synchronous DRAM，SDRAM)、双倍数据速率同步动态随机存取存储器(double data rate SDRAM，DDR SDRAM)、增强型同步动态随机存取存储器(enhanced SDRAM，ESDRAM)、同步连接动态随机存取存储器(synchlink DRAM，SLDRAM)和直接内存总线随机存取存储器(direct rambus RAM，DR RAM)。
上述实施例，可以全部或部分地通过软件、硬件、固件或其他任意组合来实现。当使用软件实现时，上述实施例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或计算机程序。在计算机上加载或执行所述计算机指令或计算机程序时，全部或部分地产生按照本申请实施例所述的流程或功能。所述计算机可以为通用计算机、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个计算机可读存储介质传输，例如，所述计算机指令可以从一个网站站点、计算机、服务器或数据中心通过有线(例如红外、无线、微波等)方式向另一个网站站点、计算机、服务器或数据中心进行传输。所述计算机可读存储介质可以是计算机能够存取的任何可用介质或者是包含一 个或多个可用介质集合的服务器、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。半导体介质可以是固态硬盘。
为了便于理解，下文中对本申请介绍方案的过程中涉及的名词进行说明。
在本申请实施例中，“指示”可以包括直接指示和间接指示，也可以包括显式指示和隐式指示。将某一信息(如上文所述的配置信息)所指示的信息称为待指示信息，则具体实现过程中，对待指示信息进行指示的方式有很多种，例如但不限于，可以直接指示待指示信息，如待指示信息本身或者该待指示信息的索引等。也可以通过指示其他信息来间接指示待指示信息，其中该其他信息与待指示信息之间存在关联关系。还可以仅仅指示待指示信息的一部分，而待指示信息的其他部分则是已知的或者提前约定的。例如，还可以借助预先约定(例如协议规定)的各个信息的排列顺序来实现对特定信息的指示，从而在一定程度上降低指示开销。
在本申请实施例中，“第一”、“第二”以及各种数字编号仅为描述方便进行的区分，并不用来限制本申请实施例的范围。例如，区分不同的指示信息、不同的波束、不同的面板等。
本申请实施例中涉及的“通信协议”可以是指通信领域的标准协议，例如可以包括LTE协议、NR协议以及应用于未来的通信系统中的相关协议，本申请对此不做限定。
本文中术语“和/或”，仅仅是一种描述关联对象的关联关系，表示可以存在三种关系，例如，A和/或B，可以表示：单独存在A，同时存在A和B，单独存在B这三种情况。另外，本文中字符“/”，一般表示前后关联对象是一种“或”的关系。
在本申请的各种实施例中，上述各过程的序号的大小并不意味着执行顺序的先后，各过程的执行顺序应以其功能和内在逻辑确定，而不应对本申请实施例的实施过程构成任何限定。
本领域普通技术人员可以意识到，结合本文中所公开的实施例描述的各示例的单元及算法步骤，能够以电子硬件、或者计算机软件和电子硬件的结合来实现。这些功能究竟以硬件还是软件方式来执行，取决于技术方案的特定应用和设计约束条件。专业技术人员可以对每个特定的应用来使用不同方法来实现所描述的功能，但是这种实现不应认为超出本申请的范围。
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。
所述功能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，仅为本申请的具体实施方式，但本申请的保护范围并不局限于此，任何熟悉本技术领域的技术人员在本申请揭露的技术范围内，可轻易想到变化或替换，都应涵盖在本申请的保护范围之内。因此，本申请的保护范围应以所述权利要求的保护范围为准。

Claims (30)

  1. 一种探测参考信号SRS的传输方法，其特征在于，包括：
    终端设备接收网络设备发送的第一配置信息和第二配置信息，所述第一配置信息用于指示用于码本CB的SRS资源和/或是否存在用于CB的SRS和用于天线切换AS的SRS的复用，所述第二配置信息用于指示所述网络设备和终端设备进行通信所采用的波形，以及最大传输层数，所述波形包括离散傅里叶变换扩展正交频分复用DFT-s-OFDM波形和/或循环前缀正交频分复用CP-OFDM波形；
    所述终端设备根据所述第一配置信息，确定是否满足第一预设条件，所述第一预设条件包括不存在所述用于CB的SRS和用于AS的SRS的复用；
    所述终端设备根据所述第二配置信息，确定是否满足第二预设条件，所述第二预设条件包括实际传输层数的上限值小于所述终端设备实际用于发射的天线数，所述实际传输层数的上限值是根据所述波形和所述最大传输层数确定的；
    在满足所述第一预设条件和所述第二预设条件的情况下，所述终端设备以小循环延时分集SCDD的方式向所述网络设备发送所述用于CB的SRS。
  2. 根据权利要求1所述的方法，其特征在于，所述第一配置信息还用于指示所述用于CB的SRS的天线端口数，所述终端设备以小循环延时分集SCDD的方式向所述网络设备发送用于CB的SRS包括：
    所述终端设备判断所述实际传输层数的上限值是否大于或等于2；
    在所述实际传输层数的上限值大于或等于2的情况下，所述终端设备用多根天线在N个所述用于CB的SRS的天线端口上，以SCDD方式向所述网络设备发送所述用于CB的SRS，其中，N等于实际传输层数的上限值；或
    在所述实际传输层数的上限值小于2的情况下，所述终端设备用多根天线在一个用于所述CB的SRS的天线端口上，以SCDD方式向所述网络设备发送所述用于CB的SRS。
  3. 根据权利要求2所述的方法，其特征在于，在所述波形是所述DFT-s-OFDM波形的情况下，所述实际传输层数的上限值为1。
  4. 根据权利要求2所述的方法，其特征在于，在所述波形是所述CP-OFDM波形的情况下，所述实际传输层数的上限值为所述最大传输层数。
  5. 根据权利要求1至4中任一项所述的方法，其特征在于，所述第一配置信息承载在SRS配置消息中。
  6. 根据权利要求1至5中任一项所述的方法，其特征在于，所述第二配置信息承载在物理上行共享信道PUSCH配置消息中。
  7. 根据权利要求1至6中任一项所述的方法，其特征在于，所述最大传输层数小于或等于所述用于CB的SRS的天线端口数和发射天线数中的最小值，
    所述用于CB的SRS的天线端口数小于所述发射天线数。
  8. 一种探测参考信号SRS的传输方法，其特征在于，包括：
    网络设备配置第一配置信息和第二配置信息，所述第一配置信息用于指示用于码本CB的SRS资源和/或是否存在用于CB的SRS和用于天线切换AS的SRS的复用，所述 第二配置信息用于指示所述网络设备和终端设备进行通信所采用的波形，以及最大传输层数，所述波形包括离散傅里叶变换扩展正交频分复用DFT-s-OFDM波形和/或循环前缀正交频分复用CP-OFDM波形；
    所述网络设备向所述终端设备发送所述第一配置信息和所述第二配置信息，所述第一配置信息用于所述终端设备确定是否满足第一预设条件，所述第一预设条件包括不存在所述用于CB的SRS和用于天线切换AS的SRS的复用，所述第二配置信息用于所述终端设备确定是否满足第二预设条件，所述第二预设条件包括实际传输层数的上限值小于所述终端设备实际用于发射的天线数，所述实际传输层数的上限值是根据所述波形和所述最大传输层数确定的；
    所述网络设备接收所述终端设备，以小循环延时分集SCDD的方式发送的所述用于CB的SRS，所述终端设备以SCDD的方式发送的所述用于CB的SRS是在所述终端设备确定满足所述第一预设条件和所述第二预设条件的情况下。
  9. 根据权利要求8所述的方法，其特征在于，所述第一配置信息还用于指示所述用于CB的SRS的天线端口数，所述网络设备接收所述终端设备，以小循环延时分集SCDD的方式发送的所述用于CB的SRS包括：
    在所述实际传输层数的上限值大于或等于2的情况下，所述网络设备接收所述终端设备用多根天线在N个所述用于CB的SRS的天线端口数上，以SCDD方式发送的所述用于CB的SRS，其中，N等于实际传输层数的上限值；或
    在所述实际传输层数的上限值小于2的情况下，所述网络设备接收所述终端设备用多根天线在一个用于所述CB的SRS的天线端口数上，以SCDD方式发送的所述用于CB的SRS。
  10. 根据权利要求9所述的方法，其特征在于，在所述波形是所述DFT-s-OFDM波形的情况下，所述实际传输层数的上限值为1。
  11. 根据权利要求9所述的方法，其特征在于，在所述波形是所述CP-OFDM波形的情况下，所述实际传输层数的上限值为所述最大传输层数。
  12. 根据权利要求8至11中任一项所述的方法，其特征在于，所述第一配置信息承载在SRS配置消息中。
  13. 根据权利要求8至12中任一项所述的方法，其特征在于，所述第二配置信息承载在物理上行共享信道PUSCH配置消息中。
  14. 根据权利要求8至13中任一项所述的方法，其特征在于，
    所述最大传输层数小于或等于所述用于CB的SRS的天线端口数和发射天线数中的最小值，
    所述用于CB的SRS的天线端口数小于所述发射天线数。
  15. 一种通信装置，其特征在于，包括：
    收发模块，用于接收网络设备发送的第一配置信息和第二配置信息，所述第一配置信息用于指示用于码本CB的SRS资源和/或是否存在用于CB的SRS和用于天线切换AS的SRS的复用，所述第二配置信息用于指示所述网络设备和终端设备进行通信所采用的波形，以及最大传输层数，所述波形包括离散傅里叶变换扩展正交频分复用DFT-s-OFDM波形和/或循环前缀正交频分复用CP-OFDM波形；
    处理模块，用于根据所述第一配置信息，确定是否满足第一预设条件，所述第一预设条件包括不存在所述用于CB的SRS和用于AS的SRS的复用；
    所述处理模块，还用于根据所述第二配置信息，确定是否满足第二预设条件，所述第二预设条件包括实际传输层数的上限值小于所述终端设备实际用于发射的天线数，所述实际传输层数的上限值是根据所述波形和所述最大传输层数确定的；
    在满足所述第一预设条件和所述第二预设条件的情况下，所述收发模块，还用于以小循环延时分集SCDD的方式向所述网络设备发送所述用于CB的SRS。
  16. 根据权利要求15所述的通信装置，其特征在于，所述第一配置信息还用于指示所述用于CB的SRS的天线端口数，所述处理模块，还用于判断所述实际传输层数的上限值是否大于或等于2；
    所述收发模块，还用于：
    在所述实际传输层数的上限值大于或等于2的情况下，用多根天线在N个所述用于CB的SRS的天线端口上，以SCDD方式向所述网络设备发送所述用于CB的SRS，其中，N等于实际传输层数的上限值；或
    在所述实际传输层数的上限值小于2的情况下，用多根天线在一个用于所述CB的SRS的天线端口上，以SCDD方式向所述网络设备发送所述用于CB的SRS。
  17. 根据权利要求16所述的通信装置，其特征在于，在所述波形是所述DFT-s-OFDM波形的情况下，所述实际传输层数的上限值为1。
  18. 根据权利要求16所述的通信装置，其特征在于，在所述波形是所述CP-OFDM波形的情况下，所述实际传输层数的上限值为所述最大传输层数。
  19. 根据权利要求15至18中任一项所述的通信装置，其特征在于，所述第一配置信息承载在SRS配置消息中。
  20. 根据权利要求15至19中任一项所述的通信装置，其特征在于，所述第二配置信息承载在物理上行共享信道PUSCH配置消息中。
  21. 根据权利要求15至20中任一项所述的通信装置，其特征在于，所述最大传输层数小于或等于所述用于CB的SRS的天线端口数和发射天线数中的最小值，
    所述用于CB的SRS的天线端口数小于所述发射天线数。
  22. 一种通信装置，其特征在于，包括：
    处理模块，用于配置第一配置信息和第二配置信息，所述第一配置信息用于指示用于码本CB的SRS资源和/或是否存在用于CB的SRS和用于天线切换AS的SRS的复用，所述第二配置信息用于指示所述网络设备和终端设备进行通信所采用的波形，以及最大传输层数，所述波形包括离散傅里叶变换扩展正交频分复用DFT-s-OFDM波形和/或循环前缀正交频分复用CP-OFDM波形；
    收发模块，用于向所述终端设备发送所述第一配置信息和所述第二配置信息，所述第一配置信息用于所述终端设备确定是否满足第一预设条件，所述第一预设条件包括不存在所述用于CB的SRS和用于天线切换AS的SRS的复用，所述第二配置信息用于所述终端设备确定是否满足第二预设条件，所述第二预设条件包括实际传输层数的上限值小于所述终端设备实际用于发射的天线数，所述实际传输层数的上限值是根据所述波形和所述最大传输层数确定的；
    所述收发模块，还用于接收所述终端设备，以小循环延时分集SCDD的方式发送的所述用于CB的SRS，所述终端设备以SCDD的方式发送的所述用于CB的SRS是在所述终端设备确定满足所述第一预设条件和所述第二预设条件的情况下。
  23. 根据权利要求22所述的通信装置，其特征在于，所述第一配置信息还用于指示所述用于CB的SRS的天线端口数，所述收发模块，还用于：
    在所述实际传输层数的上限值大于或等于2的情况下，接收所述终端设备用多根天线在N个所述用于CB的SRS的天线端口数上，以SCDD方式发送的所述用于CB的SRS，其中，N等于实际传输层数的上限值；或
    在所述实际传输层数的上限值小于2的情况下，接收所述终端设备用多根天线在一个用于所述CB的SRS的天线端口数上，以SCDD方式发送的所述用于CB的SRS。
  24. 根据权利要求23所述的通信装置，其特征在于，在所述波形是所述DFT-s-OFDM波形的情况下，所述实际传输层数的上限值为1。
  25. 根据权利要求23所述的通信装置，其特征在于，在所述波形是所述CP-OFDM波形的情况下，所述实际传输层数的上限值为所述最大传输层数。
  26. 根据权利要求22至25中任一项所述的通信装置，其特征在于，所述第一配置信息承载在SRS配置消息中。
  27. 根据权利要求22至26中任一项所述的通信装置，其特征在于，所述第二配置信息承载在物理上行共享信道PUSCH配置消息中。
  28. 根据权利要求22至27中任一项所述的通信装置，其特征在于，
    所述最大传输层数小于或等于所述用于CB的SRS的天线端口数和发射天线数中的最小值，
    所述用于CB的SRS的天线端口数小于所述发射天线数。
  29. 一种计算机可读存储介质，其特征在于，所述计算机可读存储介质存储有计算机指令，所述计算机指令使得通信设备执行如权利要求1至7中任一项所述的方法或如权利要求8至14中任一项所述的方法。
  30. 一种通信装置，其特征在于，所述装置包括处理器和存储介质，所述存储介质存储有指令，所述指令被所述处理器运行时，使得所述处理器执行如权利要求1至7中任一项所述的方法或如权利要求8至14中任一项所述的方法。
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