WO2021000076A1 - 一种无线通信方法、装置及射频子系统 - Google Patents

一种无线通信方法、装置及射频子系统 Download PDF

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Publication number
WO2021000076A1
WO2021000076A1 PCT/CN2019/093956 CN2019093956W WO2021000076A1 WO 2021000076 A1 WO2021000076 A1 WO 2021000076A1 CN 2019093956 W CN2019093956 W CN 2019093956W WO 2021000076 A1 WO2021000076 A1 WO 2021000076A1
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Prior art keywords
frequency
carrier
local oscillator
signal
radio frequency
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PCT/CN2019/093956
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English (en)
French (fr)
Inventor
高鹏
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华为技术有限公司
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Publication date
Application filed by 华为技术有限公司 filed Critical 华为技术有限公司
Priority to PCT/CN2019/093956 priority Critical patent/WO2021000076A1/zh
Priority to CN201980097622.1A priority patent/CN113994597A/zh
Priority to EP19936181.7A priority patent/EP3982546A4/en
Publication of WO2021000076A1 publication Critical patent/WO2021000076A1/zh
Priority to US17/561,204 priority patent/US20220116193A1/en

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/14—Two-way operation using the same type of signal, i.e. duplex
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/38—Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/38—Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving
    • H04B1/40—Circuits
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/38—Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving
    • H04B1/40—Circuits
    • H04B1/403—Circuits using the same oscillator for generating both the transmitter frequency and the receiver local oscillator frequency

Definitions

  • This application relates to the field of wireless communication technology, and in particular to a wireless communication method, device and radio frequency subsystem.
  • Time Division Duplexing (TDD) technology is a widely used communication method.
  • TDD wireless communication system signal reception and transmission are both on the same spectrum resource, but signal reception and transmission operations are implemented in different time slots (Slots). Since the reception and transmission of signals are on the same spectrum resource, the center frequency of the spectrum of the signal received by the communication device is the same as the center frequency of the spectrum of the signal sent by the communication device, so the receiver and transmitter of the communication device
  • the used local oscillator frequency (Local Oscillator, LO) signal may be the same LO signal. Therefore, in the design of the radio frequency transceiver, a common phase locked loop (PLL) can be used to simultaneously generate the LO signals required by the receiver and transmitter.
  • PLL phase locked loop
  • carrier aggregation has been introduced into communication systems such as advanced long term evolution (LTE-A) systems and New Radio (NR) systems.
  • CA carrier aggregation
  • LTE-A long term evolution
  • NR New Radio
  • CA component carriers
  • CC component carriers
  • the bandwidth of the spectrum resource of the signal received by the communication device and the bandwidth of the spectrum resource of the signal sent may be different. Different, this will cause the center frequency of the spectrum of the received signal to be different from the center frequency of the spectrum of the transmitted signal.
  • the PLL needs to output an LO signal that meets the center frequency required by the transmitted signal when transmitting a signal, and output an LO signal that meets the center frequency required by the received signal when receiving the signal.
  • the transmission time slot and the reception time slot are usually continuous. Therefore, the LO signal output by the PLL needs to be switched from one center frequency to another center frequency between the two time slots.
  • the communication device cannot transmit data.
  • the PLL switching time is longer, generally about 100 ⁇ s. Therefore, between the receiving time slot and the transmitting time slot, the frequency of the LO signal output by the PLL is switched to provide the receiver respectively. And the local oscillator frequency signal of the transmitter will seriously affect the receiving and transmitting performance.
  • the purpose of the embodiments of the present application is to provide a wireless communication method, device, and radio frequency subsystem to solve the problem of how to reduce the frequency of the LO signal output by the PLL switching and the communication performance is reduced.
  • the wireless communication device may be a wireless communication device, or may be a part of the device in the wireless communication device, such as integrated circuit products such as a system chip or a communication chip.
  • the wireless communication device may be a computer device that supports wireless communication functions.
  • the wireless communication device may be a terminal such as a smart phone, or may be a wireless access network device such as a base station.
  • the system chip may also be referred to as a system on chip (system on chip, SoC), or simply an SoC chip.
  • the communication chip may include a baseband processing chip and a radio frequency processing chip.
  • the baseband processing chip is sometimes called a modem or baseband chip.
  • the radio frequency processing chip is sometimes referred to as a radio frequency transceiver (transceiver) or radio frequency chip.
  • some or all of the chips in the communication chip can be integrated inside the SoC chip.
  • the baseband processing chip is integrated in the SoC chip, and the radio frequency processing chip is not integrated with the SoC chip.
  • a wireless communication device which includes: a local oscillator circuit for providing a local oscillator signal; a radio frequency transmitter coupled with the local oscillator circuit for providing a local oscillator signal according to the local oscillator circuit The first signal is sent on the first carrier; the radio frequency receiver coupled with the local oscillator circuit is used to receive the second signal on the second carrier according to the local oscillator signal of the same frequency provided by the local oscillator circuit; and The digital frequency converter coupled to the radio frequency transmitter and the radio frequency receiver is used to provide a digital frequency conversion operation to compensate for the frequency difference between the center frequency of the first carrier and the center frequency of the second carrier.
  • the frequency of the local oscillator signal provided by the local oscillator circuit does not need to be constantly switched and can remain unchanged, but is realized by a digital inverter.
  • the digital frequency conversion operation realizes compensation for the frequency difference between the center frequency of the first carrier and the center frequency of the second carrier, thereby avoiding the data transmission caused by the switching of the frequency of the local oscillator signal provided by the local oscillator circuit Interrupt to improve system performance.
  • the frequency of the local oscillator signal provided by the local oscillator circuit is equal to the center frequency of the first carrier, and the digital frequency converter is used to convert the second signal into a baseband through a digital frequency conversion operation.
  • the frequency of the digital frequency conversion operation is the frequency difference between the center frequency of the first carrier and the center frequency of the second carrier.
  • the frequency of the local oscillator signal provided by the local oscillator circuit is equal to the center frequency of the second carrier
  • the digital frequency converter is used to convert the baseband signal into the first Signal, wherein the frequency of the digital frequency conversion operation is the frequency difference between the center frequency of the first carrier and the center frequency of the second carrier.
  • the wireless communication device further includes: a baseband subsystem for processing the baseband signal.
  • the digital frequency converter includes a first digital frequency converter and a second digital frequency converter, wherein the first digital frequency converter is coupled with the radio frequency transmitter, and the second digital frequency converter is The device is coupled with the radio frequency receiver.
  • the first carrier includes one component carrier
  • the second carrier includes multiple component carriers
  • the first carrier includes multiple component carriers
  • the second carrier includes one component carrier
  • the first carrier and the second carrier are both time division duplex TDD carriers, and the first carrier and the second carrier are located in the same frequency band.
  • the local oscillator circuit includes a first local oscillator and a second local oscillator
  • the radio frequency transmitter includes a first radio frequency transmitter and a second radio frequency transmitter
  • the radio frequency receiver It includes a first radio frequency receiver and a second radio frequency receiver, wherein the first local oscillator is respectively coupled with the first radio frequency transmitter and the first radio frequency receiver, and provides a first-stage analog mixing operation
  • the second local oscillator is respectively coupled with the second radio frequency transmitter and the second radio frequency receiver, and provides the same frequency required for the second-stage analog mixing operation
  • the local oscillator signal includes a first local oscillator and a second local oscillator
  • the radio frequency transmitter includes a first radio frequency transmitter and a second radio frequency transmitter
  • the radio frequency receiver It includes a first radio frequency receiver and a second radio frequency receiver, wherein the first local oscillator is respectively coupled with the first radio frequency transmitter and the first radio frequency receiver, and provides a first-stage analog mixing operation
  • both the first carrier and the second carrier are located in the frequency range 2 of the technical specifications of the 3rd Generation Partnership Project 3GPP New Radio NR.
  • the digital frequency converter, the radio frequency receiver, and the radio frequency transmitter are integrated in the same integrated circuit chip.
  • a wireless communication device may be a wireless communication device or a set of chips in the wireless communication device, such as a radio frequency chip and a baseband chip.
  • the wireless communication device includes:
  • the local oscillator circuit is used to provide a local oscillator signal; the radio frequency transceiver coupled with the local oscillator circuit is used to send a first signal on the first carrier according to the local oscillator signal provided by the local oscillator circuit, and according to the The local oscillator signal of the same frequency provided by the local oscillator circuit receives the second signal on the second carrier; the digital frequency converter coupled with the radio frequency transceiver is used to provide a digital frequency conversion operation to compensate the center frequency of the first carrier And the frequency difference between the center frequency of the second carrier.
  • the frequency of the local oscillator signal provided by the local oscillator circuit does not need to be adjusted continuously, and can remain unchanged, but is realized by a digital inverter.
  • Digital frequency conversion operation realizes compensation for the frequency difference between the center frequency of the first carrier and the center frequency of the second carrier, thereby avoiding data transmission caused by the adjustment of the frequency of the local oscillator signal provided by the local oscillator circuit Interrupt to improve system performance.
  • a wireless communication device may be a wireless communication device or a set of chips in the wireless communication device, such as a radio frequency chip and a baseband chip.
  • the wireless communication device includes:
  • a local oscillator circuit for providing a local oscillator signal; a radio frequency transmitter coupled with the local oscillator circuit for sending a first signal on a first carrier according to the local oscillator signal provided by the local oscillator circuit; and A radio frequency receiver coupled to an oscillator circuit, for receiving a second signal on a second carrier according to the local oscillator signal provided by the local oscillator circuit; a digital converter coupled to the radio frequency transmitter and the radio frequency receiver , Used to compensate the frequency difference between the center frequency of the first carrier and the center frequency of the second carrier.
  • the frequency of the local oscillator signal provided by the local oscillator circuit does not need to be adjusted continuously, and can remain unchanged, but is realized by a digital inverter.
  • Digital frequency conversion operation realizes compensation for the frequency difference between the center frequency of the first carrier and the center frequency of the second carrier, thereby avoiding data transmission caused by the adjustment of the frequency of the local oscillator signal provided by the local oscillator circuit Interrupt to improve system performance.
  • the digital frequency converter includes a first digital frequency converter and a second digital frequency converter, the first digital frequency converter is coupled to the radio frequency transmitter, and the second digital frequency converter is connected to The radio frequency receiver is coupled;
  • the frequency of the first digital variable frequency signal output by the first digital converter according to the input first baseband signal is equal to the frequency of the first carrier The difference between the center frequency and the frequency of the local oscillator signal;
  • the frequency of the second digital frequency conversion signal input by the second digital frequency converter is equal to the center frequency of the second carrier and the frequency of the local oscillator signal. According to the difference between the frequency of the local oscillator signal, the second digital frequency converter outputs a second baseband signal according to the second digital frequency conversion signal.
  • the second carrier includes M component carriers CC
  • the first carrier includes N CCs
  • N and M are integers greater than 0, and N is less than M.
  • M is equal to 4 and N is equal to 1;
  • the center frequencies of the 4 CCs included in the second carrier are 2470 MHz, 2490 MHz, 2510 MHz, and 2530 MHz, respectively; the center frequencies of 1 CC included in the first carrier are any of the following: 2470 MHz; 2490 MHz; 2510 MHz; 2530 MHz.
  • the first carrier includes M CCs
  • the second carrier includes N component carrier CCs.
  • N and M are integers greater than 0, and N is less than M.
  • M is equal to 4 and N is equal to 1;
  • the center frequencies of the 4 CCs included in the first carrier are 2470 MHz, 2490 MHz, 2510 MHz, and 2530 MHz, respectively; the center frequencies of 1 CC included in the second carrier are any of the following: 2470 MHz; 2490 MHz; 2510 MHz; 2530 MHz.
  • the local oscillator circuit includes a first local oscillator and a second local oscillator
  • the radio frequency transmitter includes a first radio frequency transmitter and a second radio frequency transmitter
  • the radio frequency receiver Including a first radio frequency receiver and a second radio frequency receiver
  • the first local oscillator is used to output a first local oscillator signal;
  • the second local oscillator is used to output a second local oscillator signal;
  • the first radio frequency transmitter coupled with the first local oscillator is configured to receive a first digital frequency conversion signal, and perform an analog frequency conversion operation on the first digital frequency conversion signal based on the first local oscillator signal, Get the third signal;
  • the second radio frequency transmitter coupled with the second local oscillator is used to receive the third signal, and based on the second local oscillator signal, perform an analog frequency conversion operation on the third signal to obtain the The first signal, and transmitting the first signal on the first carrier;
  • the second radio frequency receiver coupled to the second local oscillator is configured to receive the second signal on the second carrier, and based on the second local oscillator signal, Perform digital frequency conversion operation to obtain the fourth signal;
  • the first radio frequency receiver coupled with the first local oscillator is configured to receive the fourth signal, and based on the second local oscillator signal, perform a digital frequency conversion operation on the fourth signal to obtain the first 2. Digital frequency conversion signal.
  • both the first carrier and the second carrier are located in the frequency range 2 of the technical specifications of the 3rd Generation Partnership Project 3GPP New Radio NR.
  • the digital frequency converter, the radio frequency receiver, and the radio frequency transmitter are integrated in the same integrated circuit chip.
  • the signal bandwidth on the interface between the baseband subsystem and the radio frequency receiver or the radio frequency transmitter can be reduced, and the load of the interface transmission can be reduced.
  • a wireless communication method which can be executed by the wireless communication device in the above solution, and includes: a radio frequency subsystem generates a local oscillator signal; the radio frequency subsystem generates a local oscillator signal based on the local oscillator signal.
  • the first signal is transmitted on the carrier, and the second signal is received on the second carrier according to the local oscillator signal of the same frequency; wherein the center frequency of the first carrier is different from the center frequency of the second carrier, and the radio frequency
  • the subsystem also provides a digital frequency conversion operation to compensate for the frequency difference between the center frequency of the first carrier and the center frequency of the second carrier.
  • the frequency of the local oscillator signal is equal to the center frequency of the first carrier
  • the digital frequency conversion operation provided by the radio frequency subsystem includes:
  • the radio frequency subsystem converts the second signal into a baseband signal through the digital frequency conversion operation, wherein the frequency of the digital frequency conversion operation is the center frequency of the first carrier and the center frequency of the second carrier The frequency difference between.
  • the frequency of the local oscillator signal is equal to the center frequency of the second carrier
  • the digital frequency conversion operation provided by the radio frequency subsystem includes:
  • the radio frequency subsystem converts the baseband signal into the first signal through the digital frequency conversion operation, wherein the frequency of the digital frequency conversion operation is the center frequency of the first carrier and the center frequency of the second carrier The frequency difference between.
  • the first carrier includes one component carrier
  • the second carrier includes multiple component carriers
  • the first carrier includes multiple component carriers
  • the second carrier includes one component carrier
  • the first carrier and the second carrier are both time division duplex TDD carriers, and the first carrier and the second carrier are located in the same frequency band.
  • both the first carrier and the second carrier are located in the frequency range 2 of the technical specifications of the 3rd Generation Partnership Project 3GPP New Radio NR.
  • a wireless communication method which can be executed by the wireless communication device in the above solution, and includes: a baseband subsystem generates a local oscillator signal; the baseband subsystem generates a local oscillator signal according to the local oscillator signal.
  • the first signal is transmitted on the carrier, and the second signal is received on the second carrier according to the local oscillator signal of the same frequency; wherein the center frequency of the first carrier is different from the center frequency of the second carrier, and the radio frequency
  • the subsystem also provides a digital frequency conversion operation to compensate for the frequency difference between the center frequency of the first carrier and the center frequency of the second carrier.
  • the frequency of the local oscillator signal is equal to the center frequency of the first carrier
  • the digital frequency conversion operation provided by the radio frequency subsystem includes:
  • the radio frequency subsystem converts the second signal into a baseband signal through the digital frequency conversion operation, wherein the frequency of the digital frequency conversion operation is the center frequency of the first carrier and the center frequency of the second carrier The frequency difference between.
  • the frequency of the local oscillator signal is equal to the center frequency of the second carrier
  • the digital frequency conversion operation provided by the radio frequency subsystem includes:
  • the radio frequency subsystem converts the baseband signal into the first signal through the digital frequency conversion operation, wherein the frequency of the digital frequency conversion operation is the center frequency of the first carrier and the center frequency of the second carrier The frequency difference between.
  • the first carrier includes one component carrier
  • the second carrier includes multiple component carriers
  • the first carrier includes multiple component carriers
  • the second carrier includes one component carrier
  • the first carrier and the second carrier are both time division duplex TDD carriers, and the first carrier and the second carrier are located in the same frequency band.
  • both the first carrier and the second carrier are located in the frequency range 2 of the technical specifications of the 3rd Generation Partnership Project 3GPP New Radio NR.
  • a radio frequency subsystem including:
  • the memory is used to store program instructions
  • the processor is configured to execute the program instructions stored in the memory, so that the radio frequency subsystem implements any of the above-mentioned possible design methods.
  • a radio frequency subsystem including:
  • the interface circuit is used to access a memory, and program instructions are stored in the memory;
  • the processor is configured to access the memory through the interface circuit, and execute the program instructions stored in the memory, so that the radio frequency subsystem implements any of the above-mentioned possible design methods.
  • a baseband subsystem including:
  • the memory is used to store program instructions
  • the processor is configured to execute the program instructions stored in the memory, so that the baseband subsystem implements any of the above-mentioned possible design methods.
  • a baseband subsystem including:
  • the interface circuit is used to access a memory, and program instructions are stored in the memory;
  • the processor is configured to access the memory through the interface circuit, and execute program instructions stored in the memory, so that the baseband subsystem implements any one of the above-mentioned possible design methods.
  • An embodiment of the present application provides a wireless communication device, which may include: a storage unit, configured to store program instructions; a processing unit, configured to execute program instructions in the storage unit, so as to implement the foregoing various technical solutions. Any possible design method.
  • the storage unit may be a memory, such as a volatile memory, for caching these program instructions. These program instructions may be loaded from other non-volatile memories into the storage unit when the data scheduling method is running.
  • the storage unit may also be a non-volatile memory, which is also integrated inside the chip.
  • the processing unit may be a processor, such as one or more processing cores of a chip.
  • the embodiment of the present application provides a computer-readable storage medium, which stores computer-readable instructions.
  • the communication device is caused to perform any of the above-mentioned possibilities. Method in design.
  • the embodiment of the present application provides a computer program product.
  • the communication device executes any of the above-mentioned possible design methods.
  • the embodiment of the present application provides a chip, which is connected to a memory, and is used to read and execute a software program stored in the memory, so as to implement any of the above-mentioned possible design methods.
  • FIG. 1 is a schematic structural diagram of a wireless communication system provided by an embodiment of this application.
  • Figure 2 is a schematic diagram of a wireless resource provided by an embodiment of the application.
  • FIG. 3 is a schematic diagram of carrier configuration of a wireless communication system provided by an embodiment of this application.
  • FIG. 4 is a schematic flowchart of an SRS handover operation provided by an embodiment of this application.
  • FIG. 5 is a schematic diagram of an uplink carrier and a downlink carrier provided by an embodiment of this application;
  • FIG. 6 is a schematic structural diagram of a wireless communication device provided by an embodiment of this application.
  • FIG. 7 is a schematic structural diagram of another wireless communication device provided by an embodiment of this application.
  • FIG. 8 is a schematic structural diagram of another wireless communication device provided by an embodiment of this application.
  • FIG. 9 is a schematic diagram of a carrier frequency spectrum provided by an embodiment of the application.
  • FIG. 10 is a schematic diagram of a carrier frequency spectrum provided by an embodiment of this application.
  • FIG. 11 is a schematic structural diagram of another wireless communication device provided by an embodiment of this application.
  • FIG. 12 is a schematic diagram of a carrier frequency spectrum provided by an embodiment of this application.
  • FIG. 13 is a schematic flowchart of a wireless communication method provided by an embodiment of this application.
  • devices can be divided into devices that provide wireless network services and devices that use wireless network services.
  • Devices that provide wireless network services refer to those devices that make up a wireless communication network, which can be referred to as network equipment or network elements for short.
  • Network equipment usually belongs to operators or infrastructure providers, and these vendors are responsible for operation or maintenance.
  • Network equipment can be further divided into radio access network (RAN) equipment and core network (CN) equipment.
  • RAN radio access network
  • CN core network
  • a typical RAN device includes a base station (BS).
  • the base station may sometimes be referred to as a wireless access point (access point, AP) or a transmission reception point (transmission reception point, TRP).
  • the base station may be a general node B (generation Node B, gNB) in a 5G new radio (NR) system, or an evolution node B (evolutional Node B, eNB) in a 4G long term evolution (LTE) system.
  • the base station can be divided into a macro base station or a micro base station.
  • Micro base stations are sometimes called small base stations or small cells.
  • a device that uses wireless network services can be referred to as a terminal for short.
  • the terminal can establish a connection with the network device, and provide users with specific wireless communication services based on the service of the network device. It should be understood that because the relationship between the terminal and the user is closer, it is sometimes called a user equipment (UE) or a subscriber unit (SU).
  • UE user equipment
  • SU subscriber unit
  • MS mobile stations
  • some network devices such as relay nodes (RN) or wireless routers, etc., may also be considered as terminals because they have UE identities or belong to users.
  • the terminal may be a mobile phone, a tablet computer, a laptop computer, a wearable device (such as a smart watch, smart bracelet, smart helmet, smart glasses), and others Devices with wireless access capabilities, such as smart cars, various Internet of Things (IOT) devices, including various smart home devices (such as smart meters and smart home appliances) and smart city devices (such as security or surveillance equipment, Intelligent road traffic facilities) etc.
  • IOT Internet of Things
  • smart home devices such as smart meters and smart home appliances
  • smart city devices such as security or surveillance equipment, Intelligent road traffic facilities
  • FIG. 1 is a schematic structural diagram of a wireless communication system provided by an embodiment of this application.
  • the wireless communication system includes a terminal and a base station. According to different transmission directions, the transmission link from the terminal to the base station is recorded as uplink (UL), and the transmission link from the base station to the terminal is recorded as downlink (DL).
  • UL uplink
  • DL downlink
  • data transmission in the uplink can be abbreviated as uplink data transmission or uplink transmission
  • data transmission in the downlink can be abbreviated as downlink data transmission or downlink transmission.
  • the base station can provide communication coverage for a specific geographic area through an integrated or external antenna device.
  • One or more terminals located within the communication coverage area of the base station can access the base station.
  • One base station can manage one or more cells. Each cell has an identification (identification), which is also called a cell identity (cell ID). From the perspective of radio resources, a cell is a combination of downlink radio resources and uplink radio resources (not necessary) paired with it.
  • the wireless communication system can comply with the wireless communication standards of the third generation partnership project (3GPP), and can also comply with other wireless communication standards, such as the Institute of Electrical and Electronics Engineers (IEEE) ) 802 series (such as 802.11, 802.15, or 802.20) wireless communication standards.
  • 3GPP Third Generation Partnership Project
  • IEEE Institute of Electrical and Electronics Engineers
  • 802 series such as 802.11, 802.15, or 802.20 wireless communication standards.
  • the wireless communication system may also include other numbers of terminals and base stations.
  • the wireless communication system may also include other network equipment, such as core network equipment.
  • the terminal and the base station should know the predefined configuration of the wireless communication system, including the radio access technology (RAT) supported by the system and the radio resource configuration specified by the system, such as the basic configuration of the radio frequency band and carrier.
  • the carrier is a frequency range that complies with the system regulations. This section of frequency range can be determined by the center frequency of the carrier (denoted as carrier frequency) and the bandwidth of the carrier.
  • the predefined configuration of these systems can be used as a part of the standard protocol of the wireless communication system, or determined by the interaction between the terminal and the base station.
  • the content of the relevant standard protocol may be pre-stored in the memory of the terminal and the base station, or embodied in the hardware circuit or software code of the terminal and the base station.
  • the terminal and the base station support one or more of the same RAT, such as 5G NR, 4G LTE, or the RAT of the future evolution system.
  • the terminal and the base station use the same air interface parameters, coding scheme, modulation scheme, etc., and communicate with each other based on the wireless resources specified by the system.
  • FIG. 2 is a schematic diagram of a radio resource provided by an embodiment of the application.
  • FIG. 2 shows a time-frequency resource grid (grid) supported by the wireless communication system, and the time-frequency resource grid may correspond to one or more carriers. It should be understood that different carriers may correspond to different time-frequency resource grids.
  • FDD frequency division duplex
  • the carrier used for uplink transmission and the carrier used for downlink transmission are different carriers, which can correspond to different time-frequency resource grids.
  • one carrier can correspond to a grid of time-frequency resources, in which part of the time-frequency resources can be used for uplink transmission, and some of the time-frequency transmission resources can be used for downlink transmission.
  • the unit of the time resource is an orthogonal frequency division multiplexing (OFDM) symbol (symbol, symbol), and the unit of the frequency resource is a subcarrier (subcarrier). , SC).
  • OFDM orthogonal frequency division multiplexing
  • SC subcarrier
  • the smallest grid in the time-frequency resource grid corresponds to 1 OFDM symbol and 1 subcarrier, and is called a resource element (RE) in the technical specifications of 3GPP.
  • RE resource element
  • the frequency domain resources of NR transmission are composed of multiple subcarriers. 12 consecutive sub-carriers can be recorded as 1 resource block (resource block, RB).
  • the time domain resources of NR transmission are composed of multiple radio frames (frames) with a duration of 10 ms, and each radio frame can be equally divided into 10 subframes (subframes) with a duration of 1 ms. Each subframe is divided into multiple slots, and each slot includes 14 consecutive OFDM symbols. Different subcarrier intervals (denoted as ⁇ f) correspond to different OFDM symbol lengths. Therefore, for different subcarrier intervals, the time length of a time slot is also different.
  • FIG. 3 is a schematic diagram of carrier configuration of a wireless communication system provided by an embodiment of the application.
  • the base station configures two carrier sets for the terminal, which are respectively denoted as the first carrier set and the second carrier set.
  • the first carrier set can be used for downlink carrier aggregation
  • the second carrier set can be used for uplink carrier aggregation.
  • the carriers included in the two carrier sets may be part of the same carrier or all of the same.
  • the first carrier set includes 6 component carriers (CC), which are sequentially denoted as CC 1 to CC 6.
  • the second carrier set includes 4 component carriers, including CC 1 to CC 4.
  • CCs included in the first carrier set and the second carrier set is for illustrative purposes only. In the embodiment of the present application, the first carrier set and the second carrier set may also include other numbers of CCs.
  • These CCs can be continuous or discontinuous in the frequency domain. Different CCs can be in the same frequency band and can correspond to intra-band carrier aggregation (intra-band CA). Different CCs can also be in different frequency bands, which can correspond to inter-band carrier aggregation (inter-band CA).
  • one component carrier can correspond to one serving cell of the terminal.
  • a component carrier is sometimes also translated as a component carrier, which can be referred to as a carrier, and a serving cell can be referred to as a cell.
  • carrier can be referred to as a carrier
  • serving cell can be referred to as a cell.
  • the terms “carrier”, “component carrier”, “aggregated carrier”, “aggregated component carrier”, “serving cell”, “cell”, “one of PCell or SCell”, “One of PCC or SCC” and “aggregated carrier” can be used interchangeably.
  • the method and apparatus provided in the embodiments of the present application can be applied to scenarios of carrier aggregation and sounding reference signal (SRS) carrier switching, and can realize fast switching of SRS carriers.
  • SRS carrier aggregation and sounding reference signal
  • the SRS switching operation is sometimes also referred to as SRS carrier switching, SRS switching, or carrier switching.
  • the second carrier set configured by the base station for the terminal includes 4 CCs.
  • the terminal may not be able to transmit SRS on these 4 CCs at the same time, so it needs to perform an SRS handover operation.
  • the terminal can first send data or SRS on CC1, then switch to CC2, and finally send SRS on CC2.
  • the data transmission of CC1 may be interrupted. The longer the interruption time of data transmission, the greater the impact on system performance. Therefore, it is necessary to reduce the interruption time of data transmission caused by the SRS switching operation.
  • FIG. 4 is a schematic flowchart of an SRS handover operation provided by an embodiment of the application.
  • Figure 4 shows an example in which the terminal performs an SRS switching operation among three carriers in one time slot.
  • a slot can include 14 OFDM symbols, which are denoted as symbol 0 to symbol 13.
  • the base station configures three CCs for the terminal, namely CC 1, CC 2, and CC 3.
  • the terminal transmits data through CC 1; then, after the data transmission of symbol 2 is completed, the terminal switches to CC 2, and transmits SRS through CC 2 in symbol 3; Switch back to CC 1 in 4, and send data and SRS through CC 1 in symbols 5 to 9.
  • the terminal switches to CC 3 in symbol 10, and sends SRS through CC 3 in symbol 11; finally, the terminal Switch back to CC 1 in symbol 12, and send data through CC 1 in symbol 13.
  • the terminal uses the same radio frequency transmission channel to transmit these data and SRS.
  • the radio frequency transmission channel needs to adapt to the frequency of CC 1.
  • the radio frequency transmission channel also needs to adapt to the frequencies of CC 2 and CC 3 respectively. Since the frequencies of CC 1, CC2, and CC 3 are different, it takes a certain time for the frequency to which the radio frequency transmission channel of the terminal is adapted to re-adjust from one frequency to another.
  • This time can be recorded as radio frequency re-adjustment time or radio frequency re-tuning Time (RF retuning time), where the radio frequency retuning time may also be referred to as radio frequency retuning delay (RF retuning delay), or radio frequency retuning gap (RF retuning gap).
  • RF retuning time radio frequency retuning time
  • RF retuning delay radio frequency retuning delay
  • RF retuning gap radio frequency retuning gap
  • the interruption time of data transmission includes radio frequency retuning time. Therefore, reducing the radio frequency retuning time can reduce the interruption time of data transmission, which is beneficial to improve the system performance.
  • the radio frequency retuning time is related to the terminal's software and hardware configuration, especially the terminal's radio frequency processing software and hardware configuration.
  • the terminal needs to directly mix the zero-intermediate frequency (ZIF) baseband signal with the local oscillator frequency signal provided by the PLL to generate a radio frequency transmission signal; correspondingly, after receiving the downlink signal , The terminal needs to directly mix the radio frequency received signal with the local oscillator frequency signal provided by the PLL to obtain a zero-IF baseband signal.
  • ZIF zero-intermediate frequency
  • the downlink signal received by the terminal and the uplink signal sent by the terminal are on the same carrier. Therefore, the center frequency of the uplink signal and the downlink signal are the same.
  • the terminal can use the PLL to provide the uplink signal and the downlink signal with the same frequency. Vibration frequency signal.
  • the number of uplink CCs scheduled by the base station for the terminal may not be the same as the number of downlink CCs.
  • the center frequency of the uplink signal of the terminal is different from the center frequency of the downlink signal.
  • the base station schedules the terminal for the terminal in the uplink of the carrier CC1, and its center frequency is f TXRF ; the downlink schedule for the terminal of the carrier is CC1 to CC4, and its center frequency is f RXRF .
  • the frequency of the local oscillator frequency signal provided by the PLL is f TXRF
  • the frequency of the local oscillator frequency signal provided by the PLL is f RXRF
  • the terminal switches to CC1 to CC4 to receive data the frequency of the local oscillator frequency signal provided by the PLL is f TXRF .
  • FIG. 6 is a schematic structural diagram of a wireless communication device provided by an embodiment of the application.
  • the wireless communication device may be a terminal or a base station in the embodiment of the present application.
  • the wireless communication device may include application subsystems, memory, mass storage, baseband subsystems, radio frequency intergreted circuit (RFIC), and radio frequency front end (radio frequency).
  • RFIC radio frequency intergreted circuit
  • RFFE radio frequency front end
  • antennas antennas
  • ANT_1 represents the first antenna, and so on, ANT_N represents the Nth antenna, and N is a positive integer greater than 1.
  • Tx represents the transmission path
  • Rx represents the reception path
  • different numbers represent different paths.
  • FBRx represents the feedback receiving path
  • PRx represents the main receiving path
  • DRx represents the diversity receiving path.
  • HB stands for high frequency
  • LB stands for low frequency. Both refer to the relative high and low of the frequency.
  • BB stands for baseband. It should be understood that the marks and components in FIG. 6 are for illustrative purposes only and are only used as a possible implementation manner, and the embodiments of the present application also include other implementation manners.
  • the application subsystem can be used as the main control system or main computing system of the wireless communication device, used to run the main operating system and application programs, manage the software and hardware resources of the entire wireless communication device, and provide users with a user operation interface.
  • the application subsystem may include one or more processing cores.
  • the application subsystem may also include driver software related to other subsystems (such as the baseband subsystem).
  • the baseband subsystem may also include one or more processing cores, as well as hardware accelerator (HAC) and cache.
  • HAC hardware accelerator
  • RFFE devices can jointly form a radio frequency subsystem.
  • the radio frequency subsystem can be further divided into radio frequency receiving channel (RF receive path) and radio frequency transmitting channel (RF transmit path).
  • the radio frequency receiving channel can receive the radio frequency signal through the antenna, and process the radio frequency signal (such as amplifying, filtering and down-converting) to obtain the baseband signal, and pass it to the baseband subsystem.
  • the radio frequency transmitting channel can receive the baseband signal from the baseband subsystem, perform radio frequency processing (such as up-conversion, amplification and filtering) on the baseband signal to obtain the radio frequency signal, and finally radiate the radio frequency signal into the space through the antenna.
  • the radio frequency subsystem may include an antenna switch, an antenna tuner, a low noise amplifier (LNA), a power amplifier (PA), a mixer (mixer), and a local oscillator (LO). ), filters and other electronic devices, which can be integrated into one or more chips as needed.
  • the antenna can sometimes be considered part of the radio frequency subsystem.
  • the baseband subsystem can extract useful information or data bits from the baseband signal, or convert the information or data bits into a baseband signal to be sent. These information or data bits can be data representing user data or control information such as voice, text, and video.
  • the baseband subsystem can implement signal processing operations such as modulation and demodulation, encoding and decoding. Different radio access technologies, such as 5G NR and 4G LTE, often have different baseband signal processing operations. Therefore, in order to support the convergence of multiple mobile communication modes, the baseband subsystem can include multiple processing cores or multiple HACs at the same time.
  • the radio frequency signal is an analog signal
  • the signal processed by the baseband subsystem is mainly a digital signal
  • an analog-to-digital conversion device is also required in the wireless communication device.
  • the analog-to-digital conversion device includes an analog-to-digital converter (ADC) that converts an analog signal into a digital signal, and a digital-to-analog converter (DAC) that converts a digital signal into an analog signal.
  • ADC analog-to-digital converter
  • DAC digital-to-analog converter
  • the analog-to-digital conversion device may be arranged in the baseband subsystem or the radio frequency subsystem.
  • the processing core may represent a processor, and the processor may be a general-purpose processor or a processor designed for a specific field.
  • the processor may be a central processing unit (center processing unit, CPU) or a digital signal processor (digital signal processor, DSP).
  • the processor can also be a microcontroller (microcontrol unit, MCU), graphics processing unit (GPU), image signal processing (ISP), audio signal processor (ASP) ), and a processor specially designed for artificial intelligence (AI) applications.
  • the AI processor includes but is not limited to a neural network processing unit (NPU), a tensor processing unit (TPU), and a processor called an AI engine.
  • the hardware accelerator can be used to implement some sub-functions with relatively large processing overhead, such as data packet assembly and analysis, and data packet encryption and decryption. These sub-functions can also be implemented using general-purpose processors, but due to performance or cost considerations, hardware accelerators may be more appropriate. Therefore, the type and number of hardware accelerators can be specifically selected based on requirements. In a specific implementation manner, one or a combination of a field programmable gate array (FPGA) and an application specific integrated circuit (ASIC) can be used for implementation. Of course, one or more processing cores can also be used in the hardware accelerator.
  • FPGA field programmable gate array
  • ASIC application specific integrated circuit
  • Memory can be divided into volatile memory (volatile memory) and non-volatile memory (non-volatile memory, NVM).
  • Volatile memory refers to the memory in which the data stored inside will be lost when the power supply is interrupted.
  • volatile memory is mainly random access memory (RAM), including static random access memory (static RAM, SRAM) and dynamic random access memory (dynamic RAM, DRAM).
  • RAM random access memory
  • SRAM static random access memory
  • DRAM dynamic random access memory
  • Non-volatile memory refers to the memory in which the data stored inside will not be lost even if the power supply is interrupted.
  • Common non-volatile memories include read only memory (ROM), optical discs, magnetic disks, and various memories based on flash memory (flash memory) technology.
  • volatile memory can be selected for memory
  • non-volatile memory such as magnetic disk or flash memory, can be selected for mass storage.
  • the baseband subsystem and the radio frequency subsystem jointly constitute a communication subsystem, which provides wireless communication functions for wireless communication devices.
  • the baseband subsystem is responsible for managing the software and hardware resources of the communication subsystem, and can configure the working parameters of the radio frequency subsystem.
  • One or more processing cores of the baseband subsystem may be integrated into one or more chips, which may be referred to as a baseband processing chip or a baseband chip.
  • RFIC can be called a radio frequency processing chip or a radio frequency chip.
  • the functional division of the radio frequency subsystem and the baseband subsystem in the communication subsystem can also be adjusted.
  • the wireless communication device may use a combination of different numbers and different types of processing cores.
  • the radio frequency subsystem may include an independent antenna, an independent radio frequency front end (RF front end, RFFE) device, and an independent radio frequency chip.
  • RF chips are sometimes called receivers, transmitters, or transceivers. Antennas, RF front-end devices and RF processing chips can all be manufactured and sold separately.
  • the radio frequency subsystem can also adopt different devices or different integration methods based on power consumption and performance requirements. For example, part of the devices belonging to the radio frequency front end are integrated into the radio frequency chip, and even the antenna and the radio frequency front end device are integrated into the radio frequency chip.
  • the radio frequency chip may also be called a radio frequency antenna module or an antenna module.
  • the baseband subsystem may be used as an independent chip, and the chip may be called a modem chip.
  • the hardware components of the baseband subsystem can be manufactured and sold in units of modem chips.
  • the modem chip is sometimes called a baseband chip or baseband processor.
  • the baseband subsystem can also be further integrated in the SoC chip, manufactured and sold in units of SoC chips.
  • the software components of the baseband subsystem can be built into the hardware components of the chip before the chip leaves the factory, or imported into the hardware components of the chip from other non-volatile memory after the chip leaves the factory, or can be downloaded online through the network And update these software components.
  • FIG. 7 is a schematic structural diagram of another wireless communication device provided by an embodiment of the application.
  • Figure 7 shows some common devices used for radio frequency signal processing in a wireless communication device.
  • the wireless communication device in the embodiment of the present application is not limited to this, and the wireless communication device may include one or more radio frequency receiving channels and radio frequency transmitting channels.
  • the radio frequency receiving channel may include modules such as a radio frequency receiver
  • the radio frequency transmitting channel may include modules such as a radio frequency transmitter.
  • the embodiment of the present application will not list other content included in the radio frequency receiving channel and the radio frequency transmitting channel one by one here.
  • the local oscillator circuit is used to provide the RF transmitter and the RF receiver with the same frequency local oscillator signal.
  • the radio frequency receiver in the radio frequency receiving channel can receive the second signal on the second carrier according to the local oscillator signal provided by the local oscillator circuit.
  • the received signal can be processed in the following manner: the radio frequency signal received from the antenna is selected by the antenna switch, filtered by the filter 1, and then sent to the radio frequency receiving channel. Since the radio frequency signal received from the antenna is usually very weak, it is usually amplified by LNA. The amplified signal first undergoes down-conversion processing by mixer 1, then filter 2 and an analog to digital converter (ADC), and finally processed by a digital inverter before being input to the baseband subsystem. The baseband signal processing is completed by the baseband subsystem.
  • ADC analog to digital converter
  • the radio frequency receiver in the radio frequency transmitting channel transmits the first signal on the first carrier according to the local oscillator signal provided by the local oscillator circuit.
  • the signal can be sent in the following manner: After the baseband signal is processed by the digital converter, it can be converted into an analog signal by a digital to analog converter (DAC), and the analog signal passes through the upper part of the mixer 2. The frequency conversion processing becomes a radio frequency signal.
  • the radio frequency signal is processed by the filter 4, the PA, and the filter 3, and finally is selected by the antenna switch, and radiates from the selected antenna.
  • the digital frequency converter is used to provide a digital frequency conversion operation to compensate for the frequency difference between the center frequency of the first carrier and the center frequency of the second carrier.
  • the digital frequency converter can be used to perform frequency conversion operations on digital signals (such as digital baseband signals). Compared with the analog frequency conversion operation provided by the mixer, the digital frequency converter requires less time to perform the frequency conversion operation and has higher efficiency.
  • the operation of digital frequency conversion may include frequency shift operations, such as multiplying the digital baseband signal to be transmitted by a preset frequency deviation or phase deviation to obtain a digital frequency conversion signal.
  • the frequency of the digital frequency conversion signal is relative to that of the digital baseband.
  • the signal has a certain offset in the frequency domain.
  • the digital frequency conversion operation can also include the adjustment of the signal bandwidth, which can be implemented by changing the sampling rate of the signal.
  • the bandwidth of the first carrier and the bandwidth of the second carrier may be the same or different.
  • the first carrier includes one component carrier
  • the second carrier includes multiple component carriers.
  • the first carrier includes multiple component carriers
  • the second carrier includes one component carrier.
  • the frequency of the local oscillator signal provided by the local oscillator circuit can remain unchanged.
  • the frequency of the local oscillator signal provided by the local oscillator circuit can be equal to that of the first carrier.
  • the center frequency may also be equal to the center frequency of the second carrier, which is not limited in the embodiment of the present application.
  • the digital frequency converter may convert the second signal into a baseband signal through a digital frequency conversion operation, where The frequency of the digital frequency conversion operation is the frequency difference between the center frequency of the first carrier and the center frequency of the second carrier.
  • the digital frequency converter may convert the baseband signal into the first signal through a digital frequency conversion operation, where The frequency of the digital frequency conversion operation is the frequency difference between the center frequency of the first carrier and the center frequency of the second carrier.
  • the frequency of the local oscillator signal provided by the local oscillator circuit can also be between the center frequency of the first carrier and the center frequency of the second carrier, or greater than the center frequency of the first carrier and the center frequency of the second carrier. The maximum value of, or less than the minimum of the center frequency of the first carrier and the center frequency of the second carrier.
  • the first carrier and the second carrier are both TDD carriers, and the first carrier and the second carrier are located in the same frequency band.
  • the input signal and the local oscillator (LO) signal provided by the local oscillator circuit are mixed to achieve down-conversion operation; in mixer 2, the input signal and the local oscillator
  • the LO signal provided by the oscillator circuit is mixed to achieve an up-conversion operation.
  • the local oscillator is a common term in the radio frequency field, usually referred to as local oscillator.
  • the local oscillator is sometimes called a frequency synthesizer or frequency synthesizer, or frequency synthesizer for short.
  • the main function of the local oscillator or frequency synthesizer is to provide the required specific frequency signal for the radio frequency processing, that is, the local oscillator signal.
  • the higher frequency local oscillator signal can be implemented by a local oscillator circuit such as a phase locked loop (PLL) or a delay locked loop (DLL).
  • the lower frequency local oscillator signal can be realized by directly using a crystal oscillator, or by dividing the high frequency signal generated by a local oscillator circuit such as a PLL.
  • the wireless communication device shown in FIG. 7 further includes a baseband subsystem, which can be used to process baseband signals.
  • a baseband subsystem which can be used to process baseband signals.
  • the specific structure and function of the baseband subsystem are not limited by the embodiment of the present application, and the description in the prior art can be referred to for details, and details are not repeated here.
  • the digital frequency converter, the radio frequency receiver, and the radio frequency transmitter can be integrated in the same integrated circuit chip, which can reduce the signal bandwidth on the interface between the baseband subsystem and the radio frequency receiver or the radio frequency transmitter. Reduce the load transmitted by the interface.
  • the digital frequency converter may include a first digital frequency converter and a second digital frequency converter, and the first digital frequency converter and the radio frequency transmitter The second digital frequency converter is coupled with the radio frequency receiver. For details, refer to FIG. 8.
  • FIG. 8 is a schematic structural diagram of another wireless communication device provided by an embodiment of this application.
  • Figure 8 shows some common devices used for radio frequency signal processing in wireless communication devices. It should be understood that although only one radio frequency receiving channel and one radio frequency transmitting channel are shown in FIG. 8, the wireless communication device in the embodiment of the present application is not limited to this, and the wireless communication device may include one or more radio frequency receiving channels and radio frequency transmitting channels. .
  • the wireless communication device sends a signal in the first carrier and receives a signal in the second carrier as an example for description.
  • the bandwidth of the first carrier and the bandwidth of the second carrier may be different.
  • the first carrier includes one component carrier
  • the second carrier includes multiple component carriers.
  • the first carrier includes multiple component carriers
  • the second carrier includes one component carrier.
  • the bandwidth of the first carrier and the bandwidth of the second carrier may also be the same, which will be described separately below.
  • the bandwidth of the first carrier is smaller than the bandwidth of the second carrier.
  • the frequency of the local oscillator signal provided by the local oscillator circuit can be equal to the center frequency of the second carrier.
  • the received signal from the second carrier can be processed in the manner in the prior art. signal of.
  • the second digital frequency converter coupled with the radio frequency receiver may directly output the input signal without performing spectrum shift processing.
  • the first digital frequency converter performs processing such as spectrum shifting on the input first baseband signal, and outputs the first digital frequency conversion signal.
  • the frequency of the first digital frequency conversion signal is equal to the center frequency of the first carrier and the local oscillator signal. The difference in frequency.
  • the second carrier includes 4 CCs, which are represented as CC1, CC2, CC3, and CC4, respectively.
  • the first carrier includes 1 CC, denoted as CC1.
  • the center frequency of the second carrier is f RXRF and the center frequency of the first carrier is f TXRF .
  • the radio frequency receiver can use the local oscillator signal provided by the local oscillator circuit according to the processing method in the prior art to directly move the spectrum of the second signal received from the second carrier to Baseband, the second baseband signal S RXBB is obtained , that is, the working mode of the radio frequency receiver at this time is the same as that of the traditional zero-IF receiver.
  • the RF transmitter cannot directly
  • the center frequency of the first baseband signal S TXBB is moved to the desired center frequency, that is, the center frequency f TXRF of the first carrier.
  • the center frequency of the first baseband signal S TXBB can be moved to f DUC through the first digital inverter to obtain the first digital frequency conversion signal.
  • the center frequency of the first digital frequency conversion signal is f DUC and f DUC is The difference between the center frequency of the first carrier and the frequency of the local oscillator signal satisfies the following formula:
  • the second spectrum shift is carried out through the radio frequency transmitter. Since the frequency of the local oscillator signal used by the radio frequency transmitter is f LO , after the second spectrum shift , the center frequency of the first signal S TXRF obtained is f TXRF :
  • the radio frequency transmitter moves the center frequency of the first baseband signal S TXBB to the desired center frequency f TXRF of the radio frequency transmitter through two frequency shifts .
  • the bandwidth of each of the 4 CCs included in the second carrier is 20 MHz, and the center frequencies of the 4 CCs are respectively 2470MHz, 2490MHz, 2510MHz and 2530MHz.
  • the bandwidth of 1 CC included in the first carrier is 20 MHz, and the center frequency is 2470 MHz.
  • the center frequency f RXRF of the second signal received by the radio frequency receiver from the second carrier is:
  • the center frequency f TXRF of the first signal transmitted by the radio frequency transmitter through the first carrier is:
  • the frequency of the local oscillator signal provided by the local oscillator circuit is:
  • the second signal received by the radio frequency receiver from the second carrier is moved to the baseband as a whole after passing through the radio frequency mixer.
  • the details may be the same as in the prior art, and will not be repeated here.
  • the first baseband signal output by the baseband subsystem is firstly shifted by the first digital frequency converter to obtain the first digital frequency conversion signal.
  • the center frequency of the first digital frequency conversion signal is f DUC :
  • the radio frequency transmitter uses the local oscillator signal provided by the local oscillator circuit to shift the spectrum of the first digital frequency conversion signal to obtain the first signal.
  • the center frequency of the first signal is f TXRF :
  • the center frequency of the first signal obtained after processing by the radio frequency transmitter is the same as the center frequency of the first carrier, so the radio frequency transmitter can transmit the first signal through the first carrier.
  • the local oscillator circuit when the bandwidth of the second carrier is greater than the bandwidth of the first carrier, the local oscillator circuit does not need to switch the frequency of the output local oscillator signal, that is, when the radio frequency transmitter sends an uplink signal, and when the radio frequency When the receiver receives the downlink signal, it keeps the frequency of the output local oscillator signal unchanged, but compensates the frequency difference between the center frequency of the first carrier and the center frequency of the second carrier through the first digital inverter, thereby avoiding the local When the oscillator circuit switches the frequency of the output local oscillator signal, the problem of data transmission interruption occurs during the switching period.
  • the bandwidth of the first carrier is greater than the bandwidth of the second carrier.
  • the frequency of the local oscillator signal provided by the local oscillator circuit may be equal to the center frequency of the first carrier.
  • the signal can be sent through the first carrier in the manner in the prior art.
  • the first digital frequency converter coupled with the radio frequency transmitter may directly output the input signal without performing spectrum shift processing.
  • the radio frequency receiver uses the local oscillator signal provided by the local oscillator circuit to perform spectrum shift on the second signal received from the second carrier to obtain the second digital frequency conversion signal.
  • the frequency of the second digital frequency conversion signal is equal to the difference between the center frequency of the second carrier and the frequency of the local oscillator signal.
  • the second digital frequency converter then moves the frequency spectrum of the input second digital frequency conversion signal to zero intermediate frequency. At this time, the center frequency of the second baseband signal output by the second digital frequency converter according to the second digital frequency conversion signal is zero.
  • the first carrier includes 4 CCs, which are represented as CC1, CC2, CC3, and CC4, respectively.
  • the second carrier includes 1 CC, denoted as CC1.
  • the center frequency of the second carrier is f RXRF and the center frequency of the first carrier is f TXRF .
  • the first digital frequency converter coupled with the radio frequency transmitter does not perform spectrum shift on the input first baseband signal S TXBB , and directly outputs it to the radio frequency transmitter.
  • the radio frequency transmitter can use the local oscillator signal provided by the local oscillator circuit to directly perform spectrum shift on the first baseband signal S TXBB according to the processing method in the prior art to obtain the first signal.
  • the working mode of the radio frequency transmitter is the same as that of the traditional zero-IF transmitter, and will not be repeated here.
  • the radio frequency receiver because the radio frequency transmitter and the radio frequency receiver share a local oscillator circuit, and the local oscillator circuit provides the radio frequency transmitter and the radio frequency receiver with the local oscillator signal of frequency f TXRF , the radio frequency receiver cannot directly The frequency spectrum of the second signal received by the second carrier is moved to zero intermediate frequency. For this reason, the radio frequency receiver moves the center frequency of the received second signal to an intermediate frequency f DDC :
  • the center frequency of the second signal is further moved by f DDC , so that the center frequency of the second signal is moved to the zero intermediate frequency of the baseband signal, that is, the first The center frequency of the second baseband signal output by the second digital frequency converter is zero.
  • the bandwidth of each of the 4 CCs included in the first carrier is 20 MHz, and the center frequencies of the 4 CCs are respectively 2470MHz, 2490MHz, 2510MHz and 2530MHz.
  • the bandwidth of 1 CC included in the second carrier is 20 MHz, and the center frequency is 2470 MHz.
  • the center frequency f TXRF of the first signal sent by the radio frequency transmitter through the first carrier is:
  • the center frequency f RXRF of the second signal received by the radio frequency receiver from the second carrier is:
  • the frequency of the local oscillator signal provided by the local oscillator circuit is:
  • the second signal received by the RF receiver from the second carrier is moved to f DDC after passing through the RF mixer to obtain the second digital frequency conversion signal.
  • the center frequency of the second digital frequency conversion signal is f DDC , f DDC satisfies the following formula:
  • the second digital frequency converter further shifts the frequency spectrum of the second digital frequency conversion signal by f DDC to obtain a second baseband signal with zero intermediate frequency.
  • the first digital frequency converter does not perform spectrum shift on the input first baseband signal S TXBB , and directly outputs it to the radio frequency transmitter.
  • the radio frequency transmitter can use the local oscillator signal provided by the local oscillator circuit to directly perform the spectrum shift of the first baseband signal S TXBB according to the processing method in the prior art to obtain the first signal, which may be the same as the prior art. No longer.
  • the local oscillator circuit when the bandwidth of the second carrier is smaller than the bandwidth of the first carrier, the local oscillator circuit does not need to switch the frequency of the output local oscillator signal, that is, when the radio frequency transmitter sends the uplink signal, and the radio frequency
  • the receiver receives the downlink signal, it keeps the frequency of the output local oscillator signal unchanged, but uses the second digital inverter to compensate for the frequency difference between the center frequency of the first carrier and the center frequency of the second carrier, thereby avoiding local
  • the oscillator circuit switches the frequency of the output local oscillator signal, the problem of data transmission interruption occurs during the switching period.
  • the 3rd generation partnership project (3GPP) defines NR frequency range 2 (Frequency Range-2, FR2) for communication.
  • both the first carrier and the second carrier may also be located in the frequency range 2 of the 3GPP NR technical specifications.
  • the transceiver architecture can consider using superheterodyne technology. That is, through two analog frequency conversions, the signal is moved between the radio frequency carrier frequency and the baseband.
  • FIG. 8 As shown in FIG. 11, a schematic structural diagram of a wireless communication device applied to NR FR2 according to an embodiment of this application.
  • the local oscillator circuit includes a first local oscillator and a second local oscillator
  • the radio frequency transmitter includes a first radio frequency transmitter and a second radio frequency transmitter.
  • the radio frequency receiver includes a first radio frequency receiver and a second radio frequency receiver. The first local oscillator is used to output a first local oscillator signal; the second local oscillator is used to output a second local oscillator signal.
  • the first local oscillator is respectively coupled to the first radio frequency transmitter and the first radio frequency receiver, and provides a local oscillator signal of the same frequency required for the first-stage analog mixing operation
  • the second local oscillator The oscillator is respectively coupled with the second radio frequency transmitter and the second radio frequency receiver, and provides a local oscillator signal of the same frequency required for the second-stage analog mixing operation.
  • the first radio frequency transmitter coupled with the first local oscillator is configured to receive a first digital frequency conversion signal, and perform an analog frequency conversion operation on the first digital frequency conversion signal based on the first local oscillator signal, Get the third signal.
  • the second radio frequency transmitter coupled with the second local oscillator is used to receive the third signal, and based on the second local oscillator signal, perform an analog frequency conversion operation on the third signal to obtain the The first signal, and the first signal is transmitted on the first carrier.
  • the second radio frequency receiver coupled to the second local oscillator is configured to receive the second signal on the second carrier, and based on the second local oscillator signal, Perform digital frequency conversion operation to obtain the fourth signal.
  • the first radio frequency receiver coupled with the first local oscillator is configured to receive the fourth signal, and based on the second local oscillator signal, perform a digital frequency conversion operation on the fourth signal to obtain the first 2. Digital frequency conversion signal.
  • the architecture shown in FIG. 11 is similar to the workflow of the architecture shown in FIG. 8, but due to the superheterodyne structure, an additional frequency conversion operation is required.
  • 4 consecutively distributed CCs are allocated in the downlink, namely CC0, CC1, CC2, and CC3.
  • the bandwidth of each CC is 200MHz, that is, a total of 800MHz spectrum resources are allocated for downlink.
  • 1 CC is allocated in the uplink with a bandwidth of 200MHz.
  • the communication service is deployed in the NR Band n257 frequency band, and the center frequency of the downlink signal is:
  • the center frequencies of the 4 downlink CCs are:
  • the center frequency of the uplink 1 CC is the same as the center frequency of the downlink CC0, namely:
  • the downlink signal first passes through the second radio frequency receiver, undergoes a frequency conversion, and moves the whole to the intermediate frequency.
  • the frequency of the second local oscillator signal provided by the second local oscillator is:
  • the center frequency of the downstream signal after moving is:
  • the downlink signal enters the first radio frequency receiver, and the frequency of the first local oscillator signal provided by the first local oscillator is:
  • the downlink intermediate frequency signal passes through the first radio frequency receiver, it is moved to the baseband as a whole and processed by the baseband subsystem.
  • the second digital frequency converter does not need to shift the frequency spectrum of the input signal.
  • the uplink signal is first processed by the first digital frequency converter and then moved to the frequency f DUC :
  • the signal processed by the first digital frequency converter enters the first radio frequency transmitter, and the first radio frequency transmitter uses the first local oscillator signal of the same frequency as the first radio frequency receiver to process the signal, and the uplink signal passes through the first radio frequency transmitter
  • the center frequency after frequency shift is:
  • the uplink intermediate frequency signal output by the first radio frequency transmitter enters the second radio frequency transmitter.
  • the second radio frequency transmitter uses a second local oscillator signal of the same frequency as the second radio frequency receiver to process the signal. After passing through the second radio frequency transmitter, the center frequency of the uplink signal is moved to f TXRF :
  • the local oscillator circuit supports the asymmetrical work scenario of uplink carrier bandwidth and downlink carrier bandwidth in carrier aggregation scenarios.
  • the method and device provided in the embodiments of the present application can also implement fast SRS switching operations.
  • SRS handover operation when the terminal switches from one carrier to another carrier, because the frequency of the carrier has changed, the frequency adapted to the radio frequency transmission channel also needs to be adjusted.
  • the frequency of the local oscillator signal output by the local oscillator circuit may be the frequency of CC 1, and in symbol 3, the terminal passes
  • CC 2 sends SRS the frequency of the local oscillator signal output by the local oscillator circuit can be the frequency of CC 2.
  • the local oscillator circuit needs to adjust the frequency of the output local oscillator signal in real time. It takes a certain period of time to re-adjust the frequency of the local oscillator signal output by the local oscillator circuit, during which time communication will not be possible.
  • the radio frequency retuning time should be less than or equal to the length of symbol 2. If the radio frequency retuning time is longer than the length of symbol 2, then in order to ensure the SRS transmission in CC 2, the terminal has to start carrier switching before symbol 2, which will affect the data transmission in symbol 1, which will cause the data transmission on CC 1. The data transmission is interrupted for a longer time. Therefore, reducing the radio frequency retuning time in the SRS switching operation is of great significance for improving system performance.
  • the terminal when the wireless communication device shown in FIG. 8 is a terminal, the terminal can keep the frequency of the local oscillator signal output by the local oscillator circuit unchanged when the SRS is switched, but is compensated and sent through a digital inverter.
  • the SRS inter-carrier rotation scenario described in conjunction with FIG. 4 is taken as an example.
  • the radio frequency transmitter transmits data through CC1
  • the frequency of the local oscillator signal provided by the local oscillator circuit is f LO .
  • the radio frequency transmitter when the radio frequency transmitter transmits data in symbol 2 through CC1, the center frequency of the baseband signal S TXBB can be moved to f DUC1 through the first digital frequency converter.
  • the radio frequency transmitter uses the local oscillator signal to perform the second spectrum shift . After the second spectrum shift , the center frequency of the signal S TXRF sent in symbol 2 is f TXRF1 .
  • f DUC1 satisfies the following formula:
  • f DUC1 f TXRF1 -f LO
  • the center frequency of the SRS sent by the radio frequency transmitter is f TXRF2 :
  • the center frequency of SRS is the same as that of CC2, so SRS can be transmitted through CC2. Since the first digital frequency converter is realized by a digital circuit, it can achieve fast frequency switching. At the same time, during the whole process, there is no need to modulate the frequency of the local oscillator signal output by the local oscillator circuit, so there will be no frequency modulation due to the local oscillator signal. The resulting communication is interrupted to send, thereby improving the stability of the performance of the radio frequency transmitter and improving the transmission efficiency.
  • the radio frequency transmitter increases the CC1 to send data again, it only needs to adjust the frequency of the spectrum shift of the first digital frequency converter to f DUC1 .
  • FIG. 13 is a schematic flowchart of a wireless communication method provided by an embodiment of this application.
  • the method may be implemented by the wireless communication device in the foregoing technical solution, and the wireless communication device may be a terminal or a base station. As shown in Figure 13, the method may include:
  • Step 1301 The radio frequency subsystem generates a local oscillator signal
  • Step 1302 The radio frequency subsystem sends a first signal on a first carrier according to the local oscillator signal, and receives a second signal on a second carrier according to the local oscillator signal of the same frequency;
  • the center frequency of the first carrier is different from the center frequency of the second carrier
  • the radio frequency subsystem also provides a digital frequency conversion operation to compensate for the center frequency of the first carrier and the center of the second carrier The frequency difference between frequencies.
  • the frequency of the local oscillator signal is equal to the center frequency of the first carrier
  • the digital frequency conversion operation provided by the radio frequency subsystem includes:
  • the radio frequency subsystem converts the second signal into a baseband signal through the digital frequency conversion operation, wherein the frequency of the digital frequency conversion operation is the center frequency of the first carrier and the center frequency of the second carrier The frequency difference between.
  • the frequency of the local oscillator signal is equal to the center frequency of the second carrier
  • the digital frequency conversion operation provided by the radio frequency subsystem includes:
  • the radio frequency subsystem converts the baseband signal into the first signal through the digital frequency conversion operation, wherein the frequency of the digital frequency conversion operation is the center frequency of the first carrier and the center frequency of the second carrier The frequency difference between.
  • the first carrier includes one component carrier
  • the second carrier includes multiple component carriers.
  • the center frequencies of the 4 CCs included in the second carrier are 2470 MHz, 2490 MHz, 2510 MHz, and 2530 MHz
  • the center frequencies of 1 CC included in the first carrier are any of the following: 2470 MHz; 2490 MHz; 2510MHz; 2530MHz.
  • the first carrier includes multiple component carriers
  • the second carrier includes one component carrier.
  • the center frequencies of the 4 CCs included in the first carrier are 2470MHz, 2490MHz, 2510MHz, and 2530MHz
  • the center frequencies of 1 CC included in the second carrier are any of the following: 2470MHz; 2490MHz; 2510MHz; 2530MHz.
  • the first carrier and the second carrier are both time division duplex TDD carriers, and the first carrier and the second carrier are located in the same frequency band.
  • both the first carrier and the second carrier are located in the frequency range 2 of the technical specifications of the 3rd Generation Partnership Project 3GPP New Radio NR.
  • the method flow shown in FIG. 13 can also be executed by the baseband subsystem.
  • the baseband subsystem generates the local oscillator signal;
  • the radio frequency subsystem may also send the first signal on the first carrier according to the local oscillator signal,
  • the second signal is received on the second carrier according to the local oscillator signal of the same frequency.
  • the center frequency of the first carrier is different from the center frequency of the second carrier
  • the radio frequency subsystem also provides a digital frequency conversion operation to compensate for the center frequency of the first carrier and the center of the second carrier The frequency difference between frequencies.
  • the present application may be implemented in whole or in part by software, hardware, firmware or any combination thereof.
  • software it can be implemented in the form of a computer program product in whole or in part.
  • the computer program product includes one or more computer program codes or computer program instructions.
  • the processes or functions described in the embodiments of the present application are generated in whole or in part.
  • the computer may be a general-purpose computer, a special-purpose computer, a computer network, or other programmable devices.
  • the computer program code or computer program instructions may be stored in a computer-readable storage medium, or transmitted from one computer-readable storage medium to another computer-readable storage medium.
  • the computer program code or computer program instructions may be downloaded from One website site, computer, server or data center transmits to another website site, computer, server or data center through wired (such as coaxial cable, optical fiber, etc.) or wireless (such as infrared, radio, microwave, etc.).
  • the computer-readable storage medium may be any available medium that can be accessed by a computer or a data storage device such as a server or a data center integrated with one or more available media.
  • the usable medium may be a magnetic medium, such as a floppy disk, a hard disk, and a magnetic tape; it may be an optical medium, such as a DVD, or a semiconductor medium, such as a solid state disk (SSD).

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Abstract

一种无线通信方法、装置及射频子系统，其中装置包括：本振电路，用于提供本振信号；与本振电路耦合的射频发射机，用于根据本振电路提供的本振信号在第一载波上发送第一信号；与所述本振电路耦合的射频接收机，用于根据所述本振电路提供的相同频率的本振信号在第二载波上接收第二信号；与射频发射机和所述射频接收机耦合的数字变频器，用于提供数字变频操作，以补偿所述第一载波的中心频率和所述第二载波的中心频率之间的频率差异。本振电路提供的本振信号的频率可以保持不变，通过数字变频器实现数字变频操作，实现补偿第一载波的中心频率和第二载波的中心频率之间的频率差异，从而避免了由于本振信号的频率在调整时导致的数据传输中断。

Description

一种无线通信方法、装置及射频子系统 技术领域
本申请涉及无线通信技术领域，尤其涉及一种无线通信方法、装置及射频子系统。
背景技术
在无线通信系统中，时分双工(Time Division Duplexing，TDD)技术是一种广泛使用的通信方式。在TDD无线通信系统中，信号的接收和发送都在同一段频谱资源上，但是信号的接收和发送操作分别在不同的时隙(Slot)来实现。由于信号的接收和发送都在同一段频谱资源上，那么通信设备接收到的信号的频谱的中心频率，与该通信设备发送的信号的频谱的中心频率相同，因此通信设备的接收机和发射机所使用的本振频率(Local Oscillator，LO)信号可以为同一个LO信号。因此在射频收发机的设计中，可以采用一个公共的锁相环(Phase Locked Loop，PLL)同时产生接收机和发射机所需要的LO信号。
为了满足用户峰值速率和系统容量的要求，在先进的长期演进(advanced long term evolution，LTE-A)系统以及新空口(New Radio，NR)系统等通信系统中，引入了载波聚合(Carrier Aggregation，CA)技术，从而可以给用户分配更大的无线频谱资源，获得吞吐率的提升。基于CA技术，可以根据用户对业务量的需求，动态的分配一个或多个成员载波(component carrier，CC)给通信设备使用。在采用CA技术的TDD无线通信系统中，通信设备接收数据量与发送数据量的需求往往是有差别的，因此通信设备接收到的信号的频谱资源的带宽与发送的信号的频谱资源的带宽可能不同，这就会导致接收到的信号的频谱的中心频率，与发送的信号的频谱的中心频率不相同。
这种中心频率不同的应用场景，会导致通信设备的接收机和发射机需要分别使用不同频率的LO信号。为此，PLL需要在发送信号时，输出一个满足发送信号所需的中心频率的LO信号，在接收信号时，输出一个满足接收信号所需的中心频率的LO信号。目前的TDD系统的通信过程中，发射时隙和接收时隙之间通常是连续的，因此PLL输出的LO信号需要在两个时隙之间从一个中心频率切换到另一个中心频率。在PLL切换期间，通信设备无法传送数据，然而PLL的切换时长较长，一般为100μs左右，因此在接收时隙和发射时隙之间，通过切换PLL输出的LO信号的频率来分别提供接收机和发射机的本振频率信号，将严重影响接收和发射性能。
为此，通信设备接收到的信号的频谱的中心频率与发送的信号的频谱的中心频率不相同时，如何降低PLL切换输出的LO信号的频率时导致通信性能降低，是一个亟待解决的问题。
发明内容
本申请实施方式的目的在于提供一种无线通信方法、装置及射频子系统，用以解决如何降低PLL切换输出的LO信号的频率时导致通信性能降低的问题。
应理解，本申请实施例提供的方案中，无线通信装置可以是无线通信设备，也可以是无线通信设备中的部分器件，如系统芯片或通信芯片等集成电路产品。无线通信设备可以是支持无线通信功能的计算机设备。
具体地，无线通信设备可以是诸如智能手机这样的终端，也可以是诸如基站这样的无线接入网设备。系统芯片也可称为片上系统(system on chip，SoC)，或简称为SoC芯片。通信芯片可包括基带处理芯片和射频处理芯片。基带处理芯片有时也被称为调制解调器(modem)或基带芯片。射频处理芯片有时也被称为射频收发机(transceiver)或射频芯片。在物理实现中，通信芯片中的部分芯片或者全部芯片可集成在SoC芯片内部。例如，基带处理芯片集成在SoC芯片中，射频处理芯片不与SoC芯片集成。
第一方面，提供了一种无线通信装置，包括：本振电路，用于提供本振信号；与所述本振电路耦合的射频发射机，用于根据所述本振电路提供的本振信号在第一载波上发送第一信号；与所述本振电路耦合的射频接收机，用于根据所述本振电路提供的相同频率的本振信号在第二载波上接收第二信号；与所述射频发射机和所述射频接收机耦合的数字变频器，用于提供数字变频操作，以补偿所述第一载波的中心频率和所述第二载波的中心频率之间的频率差异。
上述无线通信装置中，第一载波的中心频率和所述第二载波的中心频率不同时，本振电路提供的本振信号的频率无需不断切换，可以保持不变，而是通过数字变频器实现数字变频操作，实现补偿所述第一载波的中心频率和所述第二载波的中心频率之间的频率差异，从而避免了由于本振电路提供的本振信号的频率在切换时导致的数据传输中断，从而提升系统性能。
一种可选的实现方式中，所述本振电路提供的本振信号的频率等于所述第一载波的中心频率，所述数字变频器用于将所述第二信号通过数字变频操作转换为基带信号，其中，所述数字变频操作的频率大小为所述第一载波的中心频率和所述第二载波的中心频率之间的频率差异。
一种可选的实现方式中，所述本振电路提供的本振信号的频率等于所述第二载波的中心频率，所述数字变频器用于将基带信号通过数字变频操作转换为所述第一信号，其中，所述数字变频操作的频率大小为所述第一载波的中心频率和所述第二载波的中心频率之间的频率差异。
一种可选的实现方式中，所述无线通信装置还包括：基带子系统，用于处理所述基带信号。
一种可选的实现方式中，所述数字变频器包括第一数字变频器和第二数字变频器，其中，所述第一数字变频器与所述射频发射机耦合，所述第二数字变频器与所述射频接收机耦合。
一种可选的实现方式中，所述第一载波包括一个成员载波，所述第二载波包括多个成员载波。
一种可选的实现方式中，所述第一载波包括多个成员载波，所述第二载波包括一个成员载波。
一种可选的实现方式中，所述第一载波和所述第二载波均为时分双工TDD载波，所述第一载波和所述第二载波位于相同的频带。
一种可选的实现方式中，所述本振电路包括第一本地振荡器和第二本地振荡器，所述射频发射机包括第一射频发射机和第二射频发射机，所述射频接收机包括第一射频接收机和第二射频接收机，其中，所述第一本地振荡器分别与所述第一射频发射机和所述第一射 频接收机耦合，并提供第一级模拟混频操作所需的相同频率的本振信号，所述第二本地振荡器分别与所述第二射频发射机和所述第二射频接收机耦合，并提供第二级模拟混频操作所需的相同频率的本振信号。
一种可选的实现方式中，所述第一载波和所述第二载波均位于第三代合作伙伴计划3GPP新无线电NR的技术规范的频率范围2。
一种可选的实现方式中，所述数字变频器、所述射频接收机以及所述射频发射机集成在同一个集成电路芯片中。
第二方面，还提供了一种无线通信装置，该无线通信装置可以是无线通信设备，也可以是无线通信设备中的一组芯片，例如射频芯片和基带芯片。该无线通信装置包括：
本振电路，用于提供本振信号；与所述本振电路耦合的射频收发机，用于根据所述本振电路提供的本振信号在第一载波上发送第一信号，并根据所述本振电路提供的相同频率的本振信号在第二载波上接收第二信号；与所述射频收发机耦合的数字变频器，用于提供数字变频操作，以补偿所述第一载波的中心频率和所述第二载波的中心频率之间的频率差异。
上述无线通信装置中，第一载波的中心频率和所述第二载波的中心频率不同时，本振电路提供的本振信号的频率无需不断调整，可以保持不变，而是通过数字变频器实现数字变频操作，实现补偿所述第一载波的中心频率和所述第二载波的中心频率之间的频率差异，从而避免了由于本振电路提供的本振信号的频率在调整时导致的数据传输中断，从而提升系统性能。
第三方面，还提供了一种无线通信装置，该无线通信装置可以是无线通信设备，也可以是无线通信设备中的一组芯片，例如射频芯片和基带芯片。该无线通信装置包括：
本振电路，用于提供本振信号；与所述本振电路耦合的射频发射机，用于根据所述本振电路提供的本振信号在第一载波上发送第一信号；与所述本振电路耦合的射频接收机，用于根据所述本振电路提供的所述本振信号在第二载波上接收第二信号；与所述射频发射机和所述射频接收机耦合的数字变频器，用于补偿所述第一载波的中心频率和所述第二载波的中心频率之间的频率差异。
上述无线通信装置中，第一载波的中心频率和所述第二载波的中心频率不同时，本振电路提供的本振信号的频率无需不断调整，可以保持不变，而是通过数字变频器实现数字变频操作，实现补偿所述第一载波的中心频率和所述第二载波的中心频率之间的频率差异，从而避免了由于本振电路提供的本振信号的频率在调整时导致的数据传输中断，从而提升系统性能。
一种可选的实现方式中，所述数字变频器包括第一数字变频器和第二数字变频器，所述第一数字变频器与所述射频发射机耦合，所述第二数字变频器与所述射频接收机耦合；
当所述第二载波的中心频率与所述本振信号的频率相同时，所述第一数字变频器根据输入的第一基带信号输出的第一数字变频信号的频率等于所述第一载波的中心频率与所述本振信号的频率之差；
或者，当所述第一载波的中心频率与所述本振信号的频率相同时，所述第二数字变频器输入的第二数字变频信号的频率等于所述第二载波的中心频率与所述本振信号的频率 之差，所述第二数字变频器根据所述第二数字变频信号输出第二基带信号。
一种可选的实现方式中，所述第二载波包括M个成员载波CC，所述第一载波包括N个CC，N、M为大于0的整数，且N小于M。
一种可选的实现方式中，M等于4，N等于1；
所述第二载波包括的4个CC的中心频率分别为2470MHz、2490MHz、2510MHz以及2530MHz；所述第一载波包括的1个CC的中心频率为以下任一项：2470MHz；2490MHz；2510MHz；2530MHz。
一种可选的实现方式中，所述第一载波包括M个CC，所述第二载波包括N个成员载波CC，N、M为大于0的整数，且N小于M。
一种可选的实现方式中，M等于4，N等于1；
所述第一载波包括的4个CC的中心频率分别为2470MHz、2490MHz、2510MHz以及2530MHz；所述第二载波包括的1个CC的中心频率为以下任一项：2470MHz；2490MHz；2510MHz；2530MHz。
一种可选的实现方式中，所述本振电路包括第一本地振荡器和第二本地振荡器，所述射频发射机包括第一射频发射机和第二射频发射机，所述射频接收机包括第一射频接收机和第二射频接收机；
所述第一本地振荡器，用于输出第一本振信号；所述第二本地振荡器，用于输出第二本振信号；
与所述第一本地振荡器耦合的所述第一射频发射机，用于接收第一数字变频信号，并基于所述第一本振信号，对所述第一数字变频信号进行模拟变频操作，获得第三信号；
与所述第二本地振荡器耦合的所述第二射频发射机，用于接收所述第三信号，并基于所述第二本振信号，对所述第三信号进行模拟变频操作，获得所述第一信号，并在所述第一载波上传输所述第一信号；
与所述第二本地振荡器耦合的所述第二射频接收机，用于在所述第二载波上接收所述第二信号，并基于所述第二本振信号，对所述第二信号进行数字变频操作，获得第四信号；
与所述第一本地振荡器耦合的所述第一射频接收机，用于接收所述第四信号，并基于所述第二本振信号，对所述第四信号进行数字变频操作，获得第二数字变频信号。
一种可选的实现方式中，所述第一载波和所述第二载波均位于第三代合作伙伴计划3GPP新无线电NR的技术规范的频率范围2。
一种可选的实现方式中，所述数字变频器、所述射频接收机以及所述射频发射机集成在同一个集成电路芯片中。
上述实现方式中，可以降低基带子系统和射频接收机以或者射频发射机之间接口上的信号带宽，降低接口传输的负载。
第四方面，还提供了一种无线通信方法，该方法可以由上述方案中的无线通信装置执行，包括：射频子系统生成本振信号；所述射频子系统根据所述本振信号在第一载波上发送第一信号，根据所述相同频率的本振信号在第二载波上接收第二信号；其中，所述第一载波的中心频率域所述第二载波的中心频率不同，所述射频子系统还提供数字变频操作，以补偿所述第一载波的中心频率和所述第二载波的中心频率之间的频率差异。
一种可选的实现方式中，所述本振信号的频率等于所述第一载波的中心频率，所述射 频子系统提供的所述数字变频操作包括：
所述射频子系统将所述第二信号通过所述数字变频操作转换为基带信号，其中，所述数字变频操作的频率大小为所述第一载波的中心频率和所述第二载波的中心频率之间的频率差异。
一种可选的实现方式中，所述本振信号的频率等于所述第二载波的中心频率，所述射频子系统提供的所述数字变频操作包括：
所述射频子系统将基带信号通过所述数字变频操作转换为所述第一信号，其中，所述数字变频操作的频率大小为所述第一载波的中心频率和所述第二载波的中心频率之间的频率差异。
一种可选的实现方式中，所述第一载波包括一个成员载波，所述第二载波包括多个成员载波。
一种可选的实现方式中，所述第一载波包括多个成员载波，所述第二载波包括一个成员载波。
一种可选的实现方式中，所述第一载波和所述第二载波均为时分双工TDD载波，所述第一载波和所述第二载波位于相同的频带。
一种可选的实现方式中，所述第一载波和所述第二载波均位于第三代合作伙伴计划3GPP新无线电NR的技术规范的频率范围2。
第五方面，还提供了一种无线通信方法，该方法可以由上述方案中的无线通信装置执行，包括：基带子系统生成本振信号；所述基带子系统根据所述本振信号在第一载波上发送第一信号，根据所述相同频率的本振信号在第二载波上接收第二信号；其中，所述第一载波的中心频率域所述第二载波的中心频率不同，所述射频子系统还提供数字变频操作，以补偿所述第一载波的中心频率和所述第二载波的中心频率之间的频率差异。
一种可选的实现方式中，所述本振信号的频率等于所述第一载波的中心频率，所述射频子系统提供的所述数字变频操作包括：
所述射频子系统将所述第二信号通过所述数字变频操作转换为基带信号，其中，所述数字变频操作的频率大小为所述第一载波的中心频率和所述第二载波的中心频率之间的频率差异。
一种可选的实现方式中，所述本振信号的频率等于所述第二载波的中心频率，所述射频子系统提供的所述数字变频操作包括：
所述射频子系统将基带信号通过所述数字变频操作转换为所述第一信号，其中，所述数字变频操作的频率大小为所述第一载波的中心频率和所述第二载波的中心频率之间的频率差异。
一种可选的实现方式中，所述第一载波包括一个成员载波，所述第二载波包括多个成员载波。
一种可选的实现方式中，所述第一载波包括多个成员载波，所述第二载波包括一个成员载波。
一种可选的实现方式中，所述第一载波和所述第二载波均为时分双工TDD载波，所述第一载波和所述第二载波位于相同的频带。
一种可选的实现方式中，所述第一载波和所述第二载波均位于第三代合作伙伴计划3GPP新无线电NR的技术规范的频率范围2。
第六方面，还提供了一种射频子系统，包括：
处理器和存储器；
其中，所述存储器用于存储程序指令；
所述处理器用于执行所述存储器中存储的程序指令，以使所述射频子系统实现上述任一种可能的设计中的方法。
第七方面，还提供了一种射频子系统，包括：
处理器和接口电路；
其中，所述接口电路用于访问存储器，所述存储器中存储有程序指令；
所述处理器用于通过所述接口电路访问所述存储器，并执行所述存储器中存储的程序指令，以使所述射频子系统实现上述任一种可能的设计中的方法。
第八方面，还提供了一种基带子系统，包括：
处理器和存储器；
其中，所述存储器用于存储程序指令；
所述处理器用于执行所述存储器中存储的程序指令，以使所述基带子系统实现上述任一种可能的设计中的方法。
第九方面，还提供了一种基带子系统，包括：
处理器和接口电路；
其中，所述接口电路用于访问存储器，所述存储器中存储有程序指令；
所述处理器用于通过所述接口电路访问所述存储器，并执行所述存储器中存储的程序指令，以使所述基带子系统实现上述任一种可能的设计中的方法。
本申请实施例提供了一种无线通信装置，该装置可包括：存储单元，用于存储程序指令；处理单元，用于执行所述存储单元中的程序指令，以实现前述多种技术方案中的任一种可能的设计中的方法。
其中，该存储单元可以是存储器，例如易失性存储器，用于缓存这些程序指令，这些程序指令可以是所述数据调度方法运行时，从其他非易失性存储器中加载到该存储单元中。当然，所述存储单元也可以是非易失性存储器，也集成在所述芯片内部。该处理单元可以是处理器，例如芯片的一个或多个处理核心。
本申请实施例提供一种计算机可读存储介质，所述计算机存储介质中存储有计算机可读指令，当计算机读取并执行所述计算机可读指令时，使得通信装置执行上述任一种可能的设计中的方法。
本申请实施例提供一种计算机程序产品，当计算机读取并执行所述计算机程序产品时，使得通信装置执行上述任一种可能的设计中的方法。
本申请实施例提供一种芯片，所述芯片与存储器相连，用于读取并执行所述存储器中存储的软件程序，以实现上述任一种可能的设计中的方法。
应理解，上述各方面及其可选实施方式提供的技术方案，由于通过数字变频器实现数字变频操作，实现补偿第一载波的中心频率和第二载波的中心频率之间的频率差异，本振 信号的频率无需调整，而数字变频所需的时间相对较少，因此避免了由于本振电路提供的本振信号的频率在调整时导致的数据传输中断，从而提升无线通信系统的性能。
附图说明
图1为本申请实施例提供的一种无线通信系统的结构示意图；
图2为本申请实施例提供的一种无线资源的示意图；
图3为本申请实施例提供的一种无线通信系统的载波配置示意图；
图4为本申请实施例提供的一种SRS切换操作的流程示意图；
图5为本申请实施例提供的一种上行载波和下行载波示意图；
图6为本申请实施例提供的一种无线通信装置的结构示意图；
图7为本申请实施例提供的另一种无线通信装置的结构示意图；
图8为本申请实施例提供的另一种无线通信装置的结构示意图；
图9为本申请实施例提供的一种载波频谱示意图；
图10为本申请实施例提供的一种载波频谱示意图；
图11为本申请实施例提供的另一种无线通信装置的结构示意图；
图12为本申请实施例提供的一种载波频谱示意图；
图13为本申请实施例提供的一种无线通信方法流程示意图。
具体实施方式
下面结合附图并举实施例，对本申请提供的技术方案作进一步说明。应理解，本申请实施例中提供的系统结构和业务场景主要是为了解释本申请的技术方案的一些可能的实施方式，不应被解读为对本申请的技术方案的唯一性限定。本领域普通技术人员可以知晓，随着系统的演进，以及更新的业务场景的出现，本申请提供的技术方案对于相同或类似的技术问题仍然可以适用。
应理解，本申请实施例提供的技术方案，在以下具体实施例的介绍中，某些重复之处可能不再赘述，但应视为这些具体实施例之间已有相互引用，可以相互结合。
无线通信系统中，设备可分为提供无线网络服务的设备和使用无线网络服务的设备。提供无线网络服务的设备是指那些组成无线通信网络的设备，可简称为网络设备(network equipment)，或网络单元(network element)。网络设备通常归属于运营商或基础设施提供商，并由这些厂商负责运营或维护。网络设备还可进一步分为无线接入网(radio access network，RAN)设备以及核心网(core network，CN)设备。典型的RAN设备包括基站(base station，BS)。
应理解，基站有时也可以被称为无线接入点(access point，AP)，或发送接收点(transmission reception point，TRP)。具体地，基站可以是5G新无线(new radio，NR)系统中的通用节点B(generation Node B，gNB)，4G长期演进(long term evolution，LTE)系统的演进节点B(evolutional Node B，eNB)。根据基站的物理形态或发射功率的不同，基站可被分为宏基站(macro base station)或微基站(micro base station)。微基站有时也被称为小基站或小小区(small cell)。
使用无线网络服务的设备，可简称为终端(terminal)。终端能够与网络设备建立连接，并基于网络设备的服务为用户提供具体的无线通信业务。应理解，由于终端与用户的关系更加紧密，有时也被称为用户设备(user equipment，UE)，或订户单元(subscriber unit，SU)。此外，相对于通常在固定地点放置的基站，终端往往随着用户一起移动，有时也被称为移动台(mobile station，MS)。此外，有些网络设备，例如中继节点(relay node，RN)或者无线路由器等，由于具备UE身份，或者归属于用户，有时也可被认为是终端。
具体地，终端可以是移动电话(mobile phone)，平板电脑(tablet computer)，膝上型电脑(laptop computer)，可穿戴设备(比如智能手表，智能手环，智能头盔，智能眼镜)，以及其他具备无线接入能力的设备，如智能汽车，各种物联网(internet of thing，IOT)设备，包括各种智能家居设备(比如智能电表和智能家电)以及智能城市设备(比如安防或监控设备，智能道路交通设施)等。
为了便于表述，本申请中将以基站和终端为例，详细说明本申请实施例的技术方案。
图1为本申请实施例提供的一种无线通信系统的结构示意图。如图1所示，无线通信系统包括终端和基站。按照传输方向的不同，从终端到基站的传输链路记为上行链路(uplink，UL)，从基站到终端的传输链路记为下行链路(downlink，DL)。相类似地，上行链路中的数据传输可简记为上行数据传输或上行传输，下行链路中的数据传输可简记为下行数据传输或下行传输。
该无线通信系统中，基站可通过集成或外接的天线设备，为特定地理区域提供通信覆盖。位于基站的通信覆盖范围内的一个或多个终端，均可以接入基站。一个基站可以管理一个或多个小区(cell)。每个小区具有一个身份证明(identification)，该身份证明也被称为小区标识(cell identity，cell ID)。从无线资源的角度看，一个小区是下行无线资源，以及与其配对的上行无线资源(非必需)的组合。
应理解，该无线通信系统可以遵从第三代合作伙伴计划(third generation partnership project，3GPP)的无线通信标准，也可以遵从其他无线通信标准，例如电气电子工程师学会(Institute of Electrical and Electronics Engineers，IEEE)的802系列(如802.11，802.15，或者802.20)的无线通信标准。图1中虽然仅示出了一个基站和一个终端，该无线通信系统也可包括其他数目的终端和基站。此外，该无线通信系统还可包括其他的网络设备，比如核心网设备。
终端和基站应知晓该无线通信系统预定义的配置，包括系统支持的无线电接入技术(radio access technology，RAT)以及系统规定的无线资源配置等，比如无线电的频段和载波的基本配置。载波是符合系统规定的一段频率范围。这段频率范围可由载波的中心频率(记为载频)和载波的带宽共同确定。这些系统预定义的配置可作为无线通信系统的标准协议的一部分,或者通过终端和基站间的交互确定。相关标准协议的内容，可能会预先存储在终端和基站的存储器中，或者体现为终端和基站的硬件电路或软件代码。
该无线通信系统中，终端和基站支持一种或多种相同的RAT，例如5G NR，4G LTE，或未来演进系统的RAT。具体地，终端和基站采用相同的空口参数、编码方案和调制方案等，并基于系统规定的无线资源相互通信。
图2为本申请实施例提供的一种无线资源的示意图。图2示出了无线通信系统支持的时频资源网格(grid)，该时频资源网格可对应一个或多个载波。应理解，不同的载波，可以对应不同的时频资源网格。对于频分双工(frequency division duplex，FDD)系统，用于 上行传输的载波和用于下行传输的载波是不同的载波，可以分别对应不同的时频资源网格。对于时分双工TDD系统，一个载波可以对应一个时频资源网格，其中部分时频资源可用于上行传输，另外部分时频传输资源可用于下行传输。
图2所示的时频资源网格中，时间资源的单位为1个正交频分复用(orthogonal frequency division multiplexing，OFDM)符号(symbol，symb)，频率资源的单位为1个子载波(subcarrier，SC)。该时频资源网格中的最小网格，对应1个OFDM符号和1个子载波，在3GPP的技术规范中被称为资源元素(resource element，RE)。
以NR系统为例，NR传输(包括上行传输和下行传输)的频域资源被组成多个子载波。12个连续的子载波可记为1个资源块(resource block，RB)。NR传输的时域资源被组成多个时长为10ms的无线帧(frame)，每个无线帧又可被均分为10个时长为1ms的子帧(subframe)。每个子帧又被划分为多个时隙(slot)，每个时隙包括14个连续的OFDM符号。不同的子载波间隔(记为Δf)，对应不同的OFDM符号长度。因此，对于不同取值的子载波间隔，一个时隙的时间长度也有所不同。
图3为本申请实施例提供的一种无线通信系统的载波配置示意图。该无线通信系统中，基站为终端配置了两个载波集合，分别记为第一载波集合和第二载波集合。其中，第一载波集合可以用于下行载波聚合，第二载波集合可以用于上行载波聚合。这两个载波集合所包括的载波，可以部分相同的载波，也可以全部相同。
如图3所示，第一载波集合包括6个成员载波(component carrier，CC)，依次记为CC 1至CC 6。第二载波集合包括4个成员载波，包括CC 1至CC 4。应理解，第一载波集合和第二载波集合所包括的CC数目仅为示意目的，本申请实施例中，第一载波集合和第二载波集合中也可以包括其他数目的CC。这些CC在频域中既可以是连续的，也可以是非连续的。不同的CC可以在相同的频带，可对应带内载波聚合(intra-band CA)。不同的CC也可以在不同的频带，可对应带间载波聚合(inter-band CA)。
应理解，本申请中，一个成员载波可对应终端的一个服务小区(serving cell)。在中文语境下，成员载波有时也被翻译为分量载波，可简称为载波，服务小区可简称为小区。如非特别说明，在本申请中，术语“载波”、“分量载波”、“聚合载波”、“聚合分量载波”、“服务小区”、“小区”、“PCell或SCell中的一种”、“PCC或SCC中的一种”、“聚合载波”可以互换使用。
本申请实施例提供的方法及装置，可以应用于载波聚合以及探测参考信号(sounding reference signal，SRS)载波切换的场景，可以实现SRS载波的快速切换。其中，SRS切换操作有时也称为SRS载波切换，SRS切换，或者载波切换。例如，图3中，基站为终端配置的第二载波集合包括4个CC，但是，终端可能无法同时在这4个CC上发送SRS，因此需要执行SRS切换操作。终端可先在CC1上发送数据或SRS，然后切换到CC2，最后在CC2上发送SRS。其中，从CC1切换到CC2的过程中，CC1的数据传输可能会中断。数据传输的中断时间越长，对系统性能的影响也就越大，因此有必要降低SRS切换操作引起的数据传输的中断时间。
图4为本申请实施例提供的一种SRS切换操作的流程示意图。图4中示出了在一个时隙内，终端在三个载波间进行SRS切换操作的示例。如图4所示，一个时隙可包括14个 OFDM符号，分别记为符号0至符号13。基站为终端配置了三个CC，分别为CC 1、CC 2以及CC 3。首先，在符号0和符号1中，终端通过CC 1发送数据；然后，终端在符号2的数据发送结束之后，切换到CC 2，并在符号3中通过CC 2发送SRS；之后，终端在符号4中切换回CC 1，并在符号5至9中通过CC 1发送数据和SRS；再之后，终端在符号10中切换到CC 3，并在符号11中通过CC 3发送SRS；最后，终端在符号12中切换回CC 1，并在符号13中通过CC 1发送数据。
在图4的示例中，假设终端使用同一个射频发射通道发送这些数据和SRS。当终端通过CC 1发送数据或SRS时，该射频发射通道需要适配CC 1的频率。当终端分别切换到CC 2和CC 3时，该射频发射通道也需要分别适配CC 2和CC 3的频率。由于CC 1、CC2和CC 3的频率不同，终端的射频发射通道所适配的频率从一个频率重新调整到另一个频率需要一定的时间，该时间可记为射频重调整时间，或射频重调谐时间(RF retuning time)，其中，射频重调谐时间也可以称为射频重调谐时延(RF retuning delay)，或者射频重调谐间隔(RF retuning gap)。为了描述方便，以下均统称为射频重调谐时间。
如图4所示，以CC 1上的数据传输为例，在SRS切换过程中，数据传输会出现中断。如前所述，数据传输的中断时间包括射频重调谐时间。因此，减少射频重调谐时间，可以减少数据传输的中断时间，有利于提升系统性能。射频重调谐时间和终端的软硬件配置有关，特别是终端的射频处理的软硬件配置。
目前，终端在发送上行信号之前，终端需要将零中频(Zero Intermediate Frequency，ZIF)的基带信号直接与PLL提供的本振频率信号混频，产生射频发射信号；相应的，在接收到下行信号之后，终端需要将射频接收信号直接与PLL提供的本振频率信号混频，获得零中频的基带信号。在FDD系统中，终端接收的下行信号与发送的上行信号都处于同一个载波，因此上行信号和下行信号的中心频率都相同，终端可以使用PLL同时为上行信号与下行信号提供的相同频率的本振频率信号。当终端支持载波聚合场景时，基站可能为终端调度的上行CC的数量与下行CC的数量不相等，此时终端的上行信号的中心频率与下行信号的中心频率不相同。例如，如图5所示，基站为终端在上行调度的载波为CC1，其中心频率为f TXRF；为终端在下行调度的载波为CC1至CC4，其中心频率为f RXRF。此时，终端在发送上行信号时，需要PLL提供的本振频率信号的频率为f TXRF，终端在接收下行信号时，需要PLL提供的本振频率信号的频率为f RXRF，即PLL需要提供不同频率的本振频率信号。和发送SRS类似，在图5的示例中，当终端通过CC 1发送数据时，PLL提供的本振频率信号的频率为f RXRF。当终端切换到CC1至CC4接收数据时，PLL提供的本振频率信号的频率为f TXRF。由于f RXRF和f TXRF的频率不同，终端的PLL所适配的频率从一个频率重新调整到另一个频率需要一定的时间，在该过程中，数据传输会出现中断，通过本申请实施例提供的方法及装置，可以解决上述问题，后面将详细描述。
图6为本申请实施例提供的一种无线通信装置的结构示意图。该无线通信装置可以是本申请实施例中的终端或者基站。如图6所示，该无线通信装置可包括应用子系统，内存(memory)，大容量存储器(massive storge)，基带子系统，射频集成电路(radio frequency intergreted circuit，RFIC)，射频前端(radio frequency front end，RFFE)器件，以及天线(antenna，ANT)，这些器件可以通过各种互联总线或其他电连接方式耦合。
图6中，ANT_1表示第一天线，依次类推，ANT_N表示第N天线，N为大于1的正整数。Tx表示发送路径，Rx表示接收路径，不同的数字表示不同的路径。FBRx表示反馈接收路径，PRx表示主接收路径，DRx表示分集接收路径。HB表示高频，LB表示低频，两者是指频率的相对高低。BB表示基带。应理解，图6中的标记和组件仅为示意目的，仅作为一种可能的实现方式，本申请实施例还包括其他的实现方式。
其中，应用子系统可作为无线通信装置的主控制系统或主计算系统，用于运行主操作系统和应用程序，管理整个无线通信装置的软硬件资源，并可为用户提供用户操作界面。应用子系统可包括一个或多个处理核心。此外，应用子系统中也可包括与其他子系统(例如基带子系统)相关的驱动软件。基带子系统也可包括以及一个或多个处理核心，以及硬件加速器(hardware accelerator，HAC)和缓存等。
图6中，RFFE器件，RFIC 1(以及可选的RFIC 2)可以共同组成射频子系统。射频子系统可以进一步分为射频接收通道(RF receive path)和射频发射通道(RF transmit path)。射频接收通道可通过天线接收射频信号，对该射频信号进行处理(如放大、滤波和下变频)以得到基带信号，并传递给基带子系统。射频发射通道可接收来自基带子系统的基带信号，对基带信号进行射频处理(如上变频、放大和滤波)以得到射频信号，并最终通过天线将该射频信号辐射到空间中。具体地，射频子系统可包括天线开关，天线调谐器，低噪声放大器(low noise amplifier，LNA)，功率放大器(power amplifier，PA)，混频器(mixer)，本地振荡器(local oscillator，LO)、滤波器(filter)等电子器件，这些电子器件可以根据需要集成到一个或多个芯片中。天线有时也可以认为是射频子系统的一部分。
基带子系统可以从基带信号中提取有用的信息或数据比特，或者将信息或数据比特转换为待发送的基带信号。这些信息或数据比特可以是表示语音、文本、视频等用户数据或控制信息的数据。例如，基带子系统可以实现诸如调制和解调，编码和解码等信号处理操作。对于不同的无线接入技术，例如5G NR和4G LTE，往往具有不完全相同的基带信号处理操作。因此，为了支持多种移动通信模式的融合，基带子系统可同时包括多个处理核心，或者多个HAC。
此外，由于射频信号是模拟信号，基带子系统处理的信号主要是数字信号，无线通信装置中还需要有模数转换器件。模数转换器件包括将模拟信号转换为数字信号的模数转换器(analog to digital converter，ADC)，以及将数字信号转换为模拟信号的数模转换器(digital to analog converter，DAC)。本申请实施例中，模数转换器件可以设置在基带子系统中，也可以设置在射频子系统中。
应理解，本申请实施例中，处理核心可表示处理器，该处理器可以是通用处理器，也可以是为特定领域设计的处理器。例如，该处理器可以是中央处理单元(center processing unit，CPU)，也可以是数字信号处理器(digital signal processor，DSP)。该处理器也可以是微控制器(micro control unit，MCU)，图形处理器(graphics processing unit，GPU)、图像信号处理器(image signal processing，ISP)，音频信号处理器(audio signal processor，ASP)，以及为人工智能(artificial intelligence，AI)应用专门设计的处理器。AI处理器包括但不限于神经网络处理器(neural network processing unit，NPU)，张量处理器(tensor processing unit，TPU)以及被称为AI引擎的处理器。
硬件加速器可用于实现一些处理开销较大的子功能，如数据包(data packet)的组装和解析，数据包的加解密等。这些子功能采用通用功能的处理器也可以实现，但是因为性 能或成本的考量，采用硬件加速器可能更加合适。因此，硬件加速器的种类和数目可以基于需求来具体选择。在具体的实现方式中，可以使用现场可编程门阵列(field programmable gate array，FPGA)和专用集成电路(application specified intergated circuit，ASIC)中的一种或组合来实现。当然，硬件加速器中也可以使用一个或多个处理核心。
存储器可分为易失性存储器(volatile memory)和非易失性存储器(non-volatile memory，NVM)。易失性存储器是指当电源供应中断后，内部存放的数据便会丢失的存储器。目前，易失性存储器主要是随机存取存储器(random access memory，RAM)，包括静态随机存取存储器(static RAM，SRAM)和动态随机存取存储器(dynamic RAM，DRAM)。非易失性存储器是指即使电源供应中断，内部存放的数据也不会因此丢失的存储器。常见的非易失性存储器包括只读存储器(read only memory，ROM)、光盘、磁盘以及基于闪存(flash memory)技术的各种存储器等。通常来说，内存可以选用易失性存储器，大容量存储器可以选用非易失性存储器，例如磁盘或闪存。
本申请实施例中，基带子系统和射频子系统共同组成通信子系统，为无线通信装置提供无线通信功能。通常，基带子系统负责管理通信子系统的软硬件资源，并且可以配置射频子系统的工作参数。基带子系统的一个或多个处理核心可以集成为一个或多个芯片，该芯片可称为基带处理芯片或基带芯片。类似地，RFIC可以被称为射频处理芯片或射频芯片。此外，随着技术的演进，通信子系统中射频子系统和基带子系统的功能划分也可以有所调整。例如，将部分射频子系统的功能集成到基带子系统中，或者将部分基带子系统的功能集成到射频子系统中。在实际应用中，基于应用场景的需要，无线通信装置可采用不同数目和不同类型的处理核心的组合。
本申请实施例中，射频子系统可包括独立的天线，独立的射频前端(RF front end，RFFE)器件，以及独立的射频芯片。射频芯片有时也被称为接收机(receiver)、发射机(transmitter)或收发机(transceiver)。天线、射频前端器件和射频处理芯片都可以单独制造和销售。当然，射频子系统也可以基于功耗和性能的需求，采用不同的器件或者不同的集成方式。例如，将属于射频前端的部分器件集成在射频芯片中，甚至将天线和射频前端器件都集成射频芯片中，该射频芯片也可以称为射频天线模组或天线模组。
本申请实施例中，基带子系统可以作为独立的芯片，该芯片可被称调制解调器(modem)芯片。基带子系统的硬件组件可以按照modem芯片为单位来制造和销售。modem芯片有时也被称为基带芯片或基带处理器。此外，基带子系统也可以进一步集成在SoC芯片中，以SoC芯片为单位来制造和销售。基带子系统的软件组件可以在芯片出厂前内置在芯片的硬件组件中，也可以在芯片出厂后从其他非易失性存储器中导入到芯片的硬件组件中，或者还可以通过网络以在线方式下载和更新这些软件组件。
图7为本申请实施例提供的另一种无线通信装置的结构示意图。图7示出了无线通信装置中用于射频信号处理的一些常见器件。应理解，图7中虽然只示出了一条射频接收通道和一条射频发射通道，本申请实施例中的无线通信装置不限于此，无线通信装置可以包括一条或多条射频接收通道以及射频发射通道。其中，射频接收通道可以包括射频接收机等模块，射频发射通道可以包括射频发射机等模块，本申请实施例在此不再一一列举射频接收通道和射频发射通道中所包括的其它内容。
图7中，本振电路，用于为射频发射机以及射频接收机提供相同频率的本振信号。
对于射频接收通道而言，射频接收通道中的射频接收机可以根据本振电路提供的本振信号在第二载波上接收第二信号。具体的，可以通过以下方式处理接收到的信号：从天线处接收的射频信号经过天线开关的选择，并经过滤波器1滤波之后，送入射频接收通道。由于从天线接收的射频信号通常很微弱，通常采用LNA放大。放大后的信号先经过混频器1的下变频处理，再经过滤波器2和模拟-数字转换器(analog to digital converter，ADC)，最终经过数字变频器的处理后，输入至基带子系统，由基带子系统完成基带信号处理。
对于射频发射通道而言，射频发射通道中的射频接收机根据本振电路提供的本振信号在第一载波上发送第一信号。具体的，可以通过以下方式发送信号：基带信号经过数字变频器的处理后，可经过数字-模拟转换器(digital to analog converter，DAC)变为模拟信号，该模拟信号经过混频器2的上变频处理变为射频信号，该射频信号经过滤波器4、PA以及滤波器3的处理，最终经过天线开关的选择，从选择的天线向外辐射。
其中，数字变频器，用于提供数字变频操作，以用于补偿第一载波的中心频率和第二载波的中心频率之间的频率差异。该数字变频器可用于对数字信号(如数字基带信号)作变频操作，与混频器提供的模拟变频操作相比，该数字变频器执行变频操作所需的时间更少，效率更高。在具体实现中，数字变频的操作可以包括频率搬移操作，例如对待传输的数字基带信号乘以预设的频率偏差，或相位偏差，以得到数字变频信号，该数字变频信号的频率相对于数字基带信号在频率域上有一定的偏移。此外，数字变频操作还可以包括信号带宽的调整，具体可通过改变信号的采样率来实现。
本申请实施例中，第一载波的带宽与第二载波的带宽可以相同，也可以不同。第一载波的带宽与第二载波的带宽不同时，一种可能的实现方式中，第一载波包括一个成员载波，第二载波包括多个成员载波。另一种可能的实现方式中，第一载波包括多个成员载波，第二载波包括一个成员载波。
第一载波的带宽与第二载波的带宽不同时，本振电路提供的本振信号的频率可以保持不变，在该情况下，本振电路提供的本振信号的频率可以等于第一载波的中心频率，也可以等于第二载波的中心频率，本申请实施例对此并不限定。
第一种可能的场景中，在本振电路提供的本振信号的频率等于第一载波的中心频率时，所述数字变频器可以将所述第二信号通过数字变频操作转换为基带信号，其中，所述数字变频操作的频率大小为所述第一载波的中心频率和所述第二载波的中心频率之间的频率差异。
第二种可能的场景中，在本振电路提供的本振信号的频率等于第二载波的中心频率时，所述数字变频器可以将基带信号通过数字变频操作转换为所述第一信号，其中，所述数字变频操作的频率大小为所述第一载波的中心频率和所述第二载波的中心频率之间的频率差异。
当然以上只是示例，本振电路提供的本振信号的频率也可以位于第一载波的中心频率和第二载波的中心频率之间，或者大于第一载波的中心频率和第二载波的中心频率中的最大值，或者小于第一载波的中心频率和第二载波的中心频率中的最小值。
进一步可选的，本申请实施例中，第一载波和第二载波均为TDD载波，所述第一载波和所述第二载波位于相同的频带。
图7中，在混频器1中，输入信号和本振电路提供的本地振荡器(Local Oscillator， LO)信号进行混频，可以实现下变频操作；在混频器2中，输入信号和本振电路提供的LO信号进行混频，可以实现上变频操作。其中，本地振荡器是射频领域的常用术语，通常简称本振。本振有时也被称为频率合成器或频率综合器(frequency synthesizer)，简称频综。本振或频综的主要作用是为射频处理提供所需要的特定频率的信号，即本振信号。较高的频率的本振信号可以采用锁相环(phase locked loop，PLL)或延迟锁定环(delay locked loop，DLL)等本振电路实现。较低的频率的本振信号可以采用直接采用晶体振荡器，或者对PLL等本振电路产生的高频信号进行分频实现。
图7所示的无线通信装置，还包括基带子系统，基带子系统可以用于处理基带信号。基带子系统的具体结构和功能，本申请实施例并不限定，具体可以参考现有技术中的描述，在此不再赘述。
本申请实施例中，数字变频器、射频接收机以及射频发射机可以集成在同一个集成电路芯片中，这样可以降低基带子系统和射频接收机以或者射频发射机之间接口上的信号带宽，降低接口传输的负载。数字变频器、射频接收机以及射频发射机集成在同一个集成电路芯片中时，数字变频器可以包括第一数字变频器和第二数字变频器，所述第一数字变频器与所述射频发射机耦合，所述第二数字变频器与所述射频接收机耦合，具体可以参考图8所示。
图8为本申请实施例提供的另一种无线通信装置的结构示意图。图8示出了无线通信装置中用于射频信号处理的一些常见器件。应理解，图8中虽然只示出了一条射频接收通道和一条射频发射通道，本申请实施例中的无线通信装置不限于此，无线通信装置可以包括一条或多条射频接收通道以及射频发射通道。
以下为了描述方便，以该无线通信装置在第一载波中发送信号，在第二载波中接收信号为例进行说明。其中，第一载波的带宽与第二载波的带宽可以不同，举例来说，一种可能的实现方式中，第一载波包括一个成员载波，第二载波包括多个成员载波。另一种可能的实现方式中，第一载波包括多个成员载波，第二载波包括一个成员载波。当然，第一载波的带宽与第二载波的带宽也可以相同，下面分别进行描述。
结合图8，第一种可能的场景中，第一载波的带宽小于第二载波的带宽。在该场景中，本振电路提供的本振信号的频率，可以等于第二载波的中心频率，此时对于射频接收通道而言，可以按照现有技术中的方式处理从第二载波上接收到的信号。其中，与射频接收机耦合的第二数字变频器可以不对输入的信号进行频谱搬移处理，直接输出即可。
对于射频发射通道而言，第一数字变频器对输入的第一基带信号进行频谱搬移等处理，输出第一数字变频信号，第一数字变频信号的频率等于第一载波的中心频率与本振信号的频率之差。
具体的，举例来说，如图9所示，第二载波包括4个CC，分别表示为CC1、CC2、CC3及CC4。第一载波包括1个CC，表示为CC1。假设第二载波的中心频率为f RXRF，第一载波的中心频率为f TXRF。在该场景下，本振电路提供的本振信号的频率f LO＝f RXRF。此时，对于射频接收通道而言，射频接收机就可以按照现有技术中的处理方式，采用本振电路提供的本振信号，直接将从第二载波中接收到的第二信号频谱搬移到基带，获得第二基带信号S RXBB，即此时射频接收机的工作方式与传统的零中频接收机相同。
对于射频发射通道而言，由于射频发射机和射频接收机共用了一个本振电路，且本振 电路为射频发射机和射频接收机提供频率为f RXRF的本振信号，因此射频发射机无法直接将第一基带信号S TXBB的中心频率搬移到期望的中心频率，即第一载波的中心频率f TXRF。对于此场景，可以通过第一数字变频器将第一基带信号S TXBB的中心频率，先搬移到f DUC，获得第一数字变频信号，第一数字变频信号的中心频率为f DUC，f DUC为第一载波的中心频率与本振信号的频率之差，即满足以下公式：
f DUC＝f TXRF-f RXRF＝f TXRF-f LO
在此基础上，在通过射频发射机进行第二次频谱搬移。由于射频发射机采用的本振信号的频率为f LO，因此第二次频谱搬移后，获得的第一信号S TXRF的中心频率为f TXRF：
f DUC+f LO＝(f TXRF-f LO)+f LO＝f TXRF
通过上面的过程可知，射频发射机通过两次频谱搬移，将第一基带信号S TXBB的中心频率搬移到射频发射机期望的中心频率f TXRF上。
结合前面的描述，当图8所示的装置应用于TDD-LTE通信系统中时，假设第二载波包括的4个CC的中每个CC的带宽都是20MHz，4个CC的中心频率分别为2470MHz、2490MHz、2510MHz以及2530MHz。第一载波包括的1个CC的带宽是20MHz，中心频率为2470MHz。此时，射频接收机从第二载波中接收的第二信号的中心频率f RXRF为：
f RXRF＝2500MHz
相应的，射频发射机通过第一载波发送的第一信号的中心频率f TXRF为：
f TXRF＝2470MHz
在此场景下，本振电路提供的本振信号的频率为：
f LO＝f RXRF＝2500MHz
对于射频接收通道而言，射频接收机从第二载波中接收的第二信号经过射频混频器后，整体被搬移到基带，具体可以与现有技术相同，在此不再赘述。
对于射频发射通道而言，基带子系统输出的第一基带信号首先经过第一数字变频器频谱搬移，获得第一数字变频信号，第一数字变频信号的中心频率为f DUC：
f DUC＝f TXRF-f RXRF＝2470MHz-2500MHz＝-30MHz
射频发射机，采用本振电路提供的本振信号对第一数字变频信号进行频谱搬移，获得第一信号，第一信号的中心频率为f TXRF：
f TXRF＝f DUC+f LO＝-30MHz+2500MHz＝2470MHz
从上面的过程可以看出，射频发射机处理后获得的第一信号的中心频率与第一载波的中心频率相同，因此射频发射机可以通过第一载波发送第一信号。
上面的过程中，在第二载波的带宽大于第一载波的带宽的情况下，本振电路不需要对输出的本振信号的频率进行切换，即在射频发射机发送上行信号时，以及在射频接收机接收下行信号时，保持输出的本振信号的频率不变，而是通过第一数字变频器实现补偿第一载波的中心频率和第二载波的中心频率之间的频率差异，从而避免本振电路切换输出的本振信号的频率时，导致在切换期间出现数据传输中断的问题。
第二种可能的场景中，第一载波的带宽大于第二载波的带宽。在该场景中，本振电路提供的本振信号的频率，可以等于第一载波的中心频率，此时对于射频发射通道而言，可 以按照现有技术中的方式通过第一载波发送信号。其中，与射频发射机耦合的第一数字变频器可以不对输入的信号进行频谱搬移处理，直接输出即可。
对于射频接收通道而言，射频接收机采用本振电路提供的本振信号，对从第二载波中接收的第二信号进行频谱搬移，获得第二数字变频信号。第二数字变频信号的频率等于所述第二载波的中心频率与所述本振信号的频率之差。第二数字变频器再将输入的第二数字变频信号的频谱搬移至零中频，此时第二数字变频器根据第二数字变频信号输出的第二基带信号的中心频率为零。
具体的，举例来说，如图10所示，假设第一载波包括4个CC，分别表示为CC1、CC2、CC3及CC4。第二载波包括1个CC，表示为CC1。
假设第二载波的中心频率为f RXRF，第一载波的中心频率为f TXRF。在该场景下，本振电路提供的本振信号的频率f LO＝f TXRF。此时，对于射频发射通道而言，与射频发射机耦合的第一数字变频器不对输入的第一基带信号S TXBB进行频谱搬移，直接输出至射频发射机。射频发射机可以按照现有技术中的处理方式，采用本振电路提供的本振信号，直接对第一基带信号S TXBB进行频谱搬移，获得第一信号。在该场景下，射频发射机的工作方式与传统的零中频发射机相同，在此不再赘述。
对于射频接收机，由于射频发射机和射频接收机共用了一个本振电路，且本振电路为射频发射机和射频接收机提供频率为f TXRF的本振信号，因此射频接收机无法直接将从第二载波接收到的第二信号的频谱搬移至零中频，为此射频接收机将接收到的第二信号的中心频率搬移到一个中间频率f DDC：
f DDC＝f RXRF-f LO＝f RXRF-f TXRF
在此基础上，通过本申请实施例提供的第二数字变频器，进一步将第二信号的中心频率搬移f DDC，从而实现将第二信号的中心频率搬移到到基带信号的零中频，即第二数字变频器输出的第二基带信号的中心频率为0。
结合前面的描述，当图8所示的装置应用于TDD-LTE通信系统中时，假设第一载波包括的4个CC的中每个CC的带宽都是20MHz，4个CC的中心频率分别为2470MHz、2490MHz、2510MHz以及2530MHz。第二载波包括的1个CC的带宽是20MHz，中心频率为2470MHz。此时，射频发射机通过第一载波发送的第一信号的中心频率f TXRF为：
f TXRF＝2500MHz
相应的，射频接收机从第二载波中接收的第二信号的中心频率f RXRF为：
f RXRF＝2470MHz
在此场景下，本振电路提供的本振信号的频率为：
f LO＝f TXRF＝2500MHz
对于射频接收通道而言，射频接收机从第二载波中接收的第二信号经过射频混频器后，整体被搬移到f DDC，获得第二数字变频信号，第二数字变频信号的中心频率为f DDC，f DDC满足以下公式：
f DDC＝f RXRF-f TXRF＝2470MHz-2500MHz＝-30MHz
第二数字变频器，再对第二数字变频信号频谱搬移f DDC，获得零中频的第二基带信号。
对于射频发射通道而言，第一数字变频器不对输入的第一基带信号S TXBB进行频谱搬移，直接输出至射频发射机。射频发射机可以按照现有技术中的处理方式，采用本振电路 提供的本振信号，直接对第一基带信号S TXBB进行频谱搬移，获得第一信号，具体可以与现有技术相同，在此不再赘述。
上面的过程中，在第二载波的带宽小于第一载波的带宽的情况下，本振电路不需要对输出的本振信号的频率进行切换，即在射频发射机发送上行信号时，以及在射频接收机接收下行信号时，保持输出的本振信号的频率不变，而是通过第二数字变频器实现补偿第一载波的中心频率和第二载波的中心频率之间的频率差异，从而避免本振电路切换输出的本振信号的频率时，导致在切换期间出现数据传输中断的问题。
由于无线通信业务量的与日俱增，现有的无线信道越来越拥挤。为了支撑更大数据量的通信，第三代伙伴计划(the 3rd generation partnership project，3GPP)定义了NR频率范围2(Frequency Range-2，FR2)用于进行通信。对此，本申请实施例中，第一载波和第二载波还可以均位于3GPP NR的技术规范的频率范围2内。对于工作在NR FR2的无线通信系统，收发机的架构可考虑采用超外差技术。即通过两次模拟变频，实现信号在射频载频与基带之间的搬移。具体的，基于图8所示的架构，如图11所示，为本申请实施例提供的一种应用于NR FR2的无线通信装置的结构示意图。
相比于图8所示的架构，图11中，本振电路包括第一本地振荡器和第二本地振荡器，所述射频发射机包括第一射频发射机和第二射频发射机，所述射频接收机包括第一射频接收机和第二射频接收机。所述第一本地振荡器，用于输出第一本振信号；所述第二本地振荡器，用于输出第二本振信号。
所述第一本地振荡器分别与所述第一射频发射机和所述第一射频接收机耦合，并提供第一级模拟混频操作所需的相同频率的本振信号，所述第二本地振荡器分别与所述第二射频发射机和所述第二射频接收机耦合，并提供第二级模拟混频操作所需的相同频率的本振信号。
与所述第一本地振荡器耦合的所述第一射频发射机，用于接收第一数字变频信号，并基于所述第一本振信号，对所述第一数字变频信号进行模拟变频操作，获得第三信号。
与所述第二本地振荡器耦合的所述第二射频发射机，用于接收所述第三信号，并基于所述第二本振信号，对所述第三信号进行模拟变频操作，获得所述第一信号，并在所述第一载波上传输所述第一信号。
与所述第二本地振荡器耦合的所述第二射频接收机，用于在所述第二载波上接收所述第二信号，并基于所述第二本振信号，对所述第二信号进行数字变频操作，获得第四信号。
与所述第一本地振荡器耦合的所述第一射频接收机，用于接收所述第四信号，并基于所述第二本振信号，对所述第四信号进行数字变频操作，获得第二数字变频信号。
图11所示的架构，和图8所示的架构的工作流程类似，但是由于采用了超外差结构，因此需要增加一次变频操作。举例来说，工作在NR FR2的通信业务，下行分配了4个连续分布的CC，分别为CC0、CC1、CC2和CC3。其中每个CC的带宽为200MHz，即下行的总共分配了800MHz频谱资源。同时，上行分配了1个CC，带宽为200MHz。假设，该通信业务部署在NR Band n257频段，下行信号的中心频率为：
f RXRF＝28GHz
其中下行4个CC的中心频率分别为：
f CC0RF＝27.7GHz
f CC1RF＝27.9GHz
f CC2RF＝28.1GHz
f CC3RF＝28.3GHz
假设，在此通信业务中，上行1个CC的中心频率与下行CC0的中心频率相同，即：
f TXRF＝f CC0RF＝27.7GHz
结合图12所示，在射频接收通道中，下行信号首先经过第二射频接收机，进行一次变频，整体搬移到中频频率。在第二射频接收机中，第二本地振荡器提供的第二本振信号的频率为：
f HFLO＝20GHz
搬移后的下行信号的中心频率为：
f RXIF＝f RXRF-f HFLO＝28GHz-20GHz＝8GHz
下行信号进入第一射频接收机，第一本地振荡器提供的第一本振信号的频率为：
f IFLO＝8GHz
下行中频信号经过第一射频接收机后，整体搬移到基带，并由基带子系统处理。在此过程中，第二数字变频器不需要对输入的信号进行频谱搬移。
该通信业务中，上行信号首先经过第一数字变频器处理，被搬移到频率f DUC：
f DUC＝f TXRF-f RXRF＝27.7GHz-28GHz＝-300MHz
经过第一数字变频器处理的信号进入第一射频发射机中，第一射频发射机采用与第一射频接收机相同频率的第一本振信号对信号处理，则上行信号经过第一射频发射机移频后的中心频率为：
f TXIF＝f DUC+f IFLO＝-300MHz+8GHz＝7.7GHz
第一射频发射机输出的上行中频信号，进入第二射频发射机中。第二射频发射机采用与第二射频接收机相同频率的第二本振信号对信号处理。则经过第二射频发射机后，上行信号的中心频率被搬移至f TXRF：
f TXRF＝f TXIF+f HFLO＝7.7GHz+20GHz＝27.7GHz
通过上面的描述可知，通过在射频发射通道引入第一数字变频器，以及在射频接收通道引入第二数字变频器，补偿上行载波带宽与下行载波带宽之间的差值，实现可以使用一套共用的本振电路，支持载波聚合场景中出现的上行载波带宽与下行载波带宽不对称工作场景。
本申请实施例提供的方法及装置，还可以实现快速的SRS切换操作。对于SRS切换操作而言，当终端从一个载波切换到另一个载波时，由于载波的频点发生了变化，射频发射通道所适配的频率也需要调整。图4的示例中，在符号0和符号1中终端通过CC 1发送数据时，现有技术中，本振电路输出的本振信号的频率可以为CC 1的频点，在符号3中终端通过CC 2发送SRS时，本振电路输出的本振信号的频率可以为CC 2的频点。由于CC 1和CC 2的频点不同，本振电路需要实时调整输出的本振信号的频率。本振电路输出的本振信号的频率重新调整需要一定的时间，这段时间内会无法进行通信。图4的示例中，如果终端需要在符号2中完成载波切换，则射频重调谐时间应当小于或等于符号2的长度。如果射频重调谐的时间大于符号2的长度，那么为了保障CC 2中的SRS传输，终端不得不在符号2之前 就需要启动载波切换，使得符号1中的数据传输受到影响，从而导致CC 1上的数据传输中断的时间更长。因此，降低SRS切换操作中射频重调谐时间对于提升系统性能很有意义。
为此，本申请实施例中，图8所示的无线通信装置为终端时，终端在SRS切换时，可以保持本振电路输出的本振信号的频率不变，而是通过数字变频器补偿发送SRS的不同载波的中心频率之间的频率差异。具体的，结合图4描述的SRS载波间轮发场景为例。图4中，在进行正常的通信业务时，射频发射机通过CC1发送数据，CC1的中心频率为f 1，即射频发射机发送的信号的中心频率f TXRF1＝f 1。本振电路提供的本振信号的频率为f LO。
结合图8所示的无线通信装置，对于此场景，射频发射机通过CC1在符号2中发送数据时，可以通过第一数字变频器将基带信号S TXBB的中心频率，先搬移到f DUC1。在此基础上，射频发射机采用本振信号进行第二次频谱搬移，第二次频谱搬移后，在符号2中发送的信号S TXRF的中心频率为f TXRF1。
其中，f DUC1满足以下公式：
f DUC1＝f TXRF1-f LO
当发射机需要通过CC2在符号3中发送SRS时，可以保持本振电路提供的本振信号的频率不变，通过将第一数字变频器频谱搬移的频率由f DUC1调整为f DUC2，其中，f DUC2＝f 2-f LO。f 2为CC2的中心频率。
此时，射频发射机发送的SRS的中心频点为f TXRF2：
f TXRF2＝f LO+f DUC2＝f 2
通过上面的描述可知，SRS的中心频与CC2的中心频点相同，因此SRS可以通过CC2发送。由于第一数字变频器是通过数字电路实现，可以实现快速的频率切换，同时在整个过程中，不需要调制本振电路输出的本振信号的频率，从而不会出现由于本振信号的频率调制导致的通信中断的发送，从而提高了射频发射机性能的稳定性，提高传输效率。
进一步的，当SRS发送完成之后，射频发射机重新提高CC1发送数据时，只需要将第一数字变频器频谱搬移的频率调整为f DUC1即可。
图13为本申请实施例提供的一种无线通信方法的流程示意图。该方法可以由前述技术方案中的无线通信装置来实施，该无线通信装置可以为终端，也可以为基站。如图13所述，该方法可以包括：
步骤1301：射频子系统生成本振信号；
步骤1302：所述射频子系统根据所述本振信号在第一载波上发送第一信号，根据所述相同频率的本振信号在第二载波上接收第二信号；
其中，所述第一载波的中心频率域所述第二载波的中心频率不同，所述射频子系统还提供数字变频操作，以补偿所述第一载波的中心频率和所述第二载波的中心频率之间的频率差异。
一种可选的实现方式中，所述本振信号的频率等于所述第一载波的中心频率，所述射频子系统提供的所述数字变频操作包括：
所述射频子系统将所述第二信号通过所述数字变频操作转换为基带信号，其中，所述数字变频操作的频率大小为所述第一载波的中心频率和所述第二载波的中心频率之间的频率差异。
一种可选的实现方式中，所述本振信号的频率等于所述第二载波的中心频率，所述射 频子系统提供的所述数字变频操作包括：
所述射频子系统将基带信号通过所述数字变频操作转换为所述第一信号，其中，所述数字变频操作的频率大小为所述第一载波的中心频率和所述第二载波的中心频率之间的频率差异。
一种可选的实现方式中，所述第一载波包括一个成员载波，所述第二载波包括多个成员载波。举例来说，所述第二载波包括的4个CC的中心频率分别为2470MHz、2490MHz、2510MHz以及2530MHz；所述第一载波包括的1个CC的中心频率为以下任一项：2470MHz；2490MHz；2510MHz；2530MHz。
一种可选的实现方式中，所述第一载波包括多个成员载波，所述第二载波包括一个成员载波。举例来说，第一载波包括的4个CC的中心频率分别为2470MHz、2490MHz、2510MHz以及2530MHz；所述第二载波包括的1个CC的中心频率为以下任一项：2470MHz；2490MHz；2510MHz；2530MHz。
一种可选的实现方式中，所述第一载波和所述第二载波均为时分双工TDD载波，所述第一载波和所述第二载波位于相同的频带。
一种可选的实现方式中，所述第一载波和所述第二载波均位于第三代合作伙伴计划3GPP新无线电NR的技术规范的频率范围2。
图13所示的方法流程，还可以由基带子系统执行，此时由基带子系统生成本振信号；所述射频子系统还可以根据所述本振信号在第一载波上发送第一信号，根据所述相同频率的本振信号在第二载波上接收第二信号。
其中，所述第一载波的中心频率域所述第二载波的中心频率不同，所述射频子系统还提供数字变频操作，以补偿所述第一载波的中心频率和所述第二载波的中心频率之间的频率差异。
应理解，在本申请中，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。本申请提到的“耦合”一词，用于表达不同组件之间的互通或互相作用，可以包括直接相连或通过其他组件间接相连。
在本申请的上述实施例中，可以全部或部分地通过软件、硬件、固件或者其任意组合来实现。当使用软件实现时，可以全部或部分地以计算机程序产品的形式实现。所述计算机程序产品包括一个或多个计算机程序代码或计算机程序指令。在计算机上加载和执行所述计算机程序指令时，全部或部分地产生按照本申请实施例所述的流程或功能。所述计算机可以是通用计算机、专用计算机、计算机网络、或者其他可编程装置。
所述计算机程序代码或计算机程序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，所述计算机程序代码或计算机程序指令可以从一个网站站点、计算机、服务器或数据中心通过有线(例如同轴电缆、光纤等)或无线(例如红外、无线电、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成的服务器、数据中心等数据存储设备。所述可用介质可以是磁性介质，例如，软盘、硬盘和磁带；可以是光介质，例如DVD；也可以是半导体介质，例如固态硬盘(Solid State Disk，SSD)等。
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权利要求的保护范围为准。
显然，本领域的技术人员可以对本申请进行各种改动和变型而不脱离本申请的范围。这样，倘若本申请的这些修改和变型属于本申请权利要求及其等同技术的范围之内，则本申请也意图包含这些改动和变型在内。

Claims (20)

  1. 一种无线通信装置，其特征在于，包括：
    本振电路，用于提供本振信号；
    与所述本振电路耦合的射频发射机，用于根据所述本振电路提供的本振信号在第一载波上发送第一信号；
    与所述本振电路耦合的射频接收机，用于根据所述本振电路提供的相同频率的本振信号在第二载波上接收第二信号；
    与所述射频发射机和所述射频接收机耦合的数字变频器，用于提供数字变频操作，以补偿所述第一载波的中心频率和所述第二载波的中心频率之间的频率差异。
  2. 根据权利要求1所述的装置，其特征在于：
    所述本振电路提供的本振信号的频率等于所述第一载波的中心频率，所述数字变频器用于将所述第二信号通过数字变频操作转换为基带信号，其中，所述数字变频操作的频率大小为所述第一载波的中心频率和所述第二载波的中心频率之间的频率差异。
  3. 根据权利要求1所述的装置，其特征在于：
    所述本振电路提供的本振信号的频率等于所述第二载波的中心频率，所述数字变频器用于将基带信号通过数字变频操作转换为所述第一信号，其中，所述数字变频操作的频率大小为所述第一载波的中心频率和所述第二载波的中心频率之间的频率差异。
  4. 根据权利要求2或3所述的装置，其特征在于，还包括：
    基带子系统，用于处理所述基带信号。
  5. 根据权利要求1至4任一所述的装置，其特征在于：
    所述数字变频器包括第一数字变频器和第二数字变频器，其中，所述第一数字变频器与所述射频发射机耦合，所述第二数字变频器与所述射频接收机耦合。
  6. 根据权利要求1至5任一所述的装置，其特征在于：
    所述第一载波包括一个成员载波，所述第二载波包括多个成员载波。
  7. 根据权利要求1至6任一所述的装置，其特征在于：
    所述第一载波和所述第二载波均为时分双工TDD载波，所述第一载波和所述第二载波位于相同的频带。
  8. 根据权利要求1至7任一所述的装置，其特征在于，所述本振电路包括第一本地振荡器和第二本地振荡器，所述射频发射机包括第一射频发射机和第二射频发射机，所述射频接收机包括第一射频接收机和第二射频接收机，其中，所述第一本地振荡器分别与所述第一射频发射机和所述第一射频接收机耦合，并提供第一级模拟混频操作所需的相同频率的本振信号，所述第二本地振荡器分别与所述第二射频发射机和所述第二射频接收机耦 合，并提供第二级模拟混频操作所需的相同频率的本振信号。
  9. 根据权利要求8所述的装置，其特征在于，所述第一载波和所述第二载波均位于第三代合作伙伴计划3GPP新无线电NR的技术规范的频率范围2。
  10. 根据权利要求1至9任一所述的装置，其特征在于，所述数字变频器、所述射频接收机以及所述射频发射机集成在同一个集成电路芯片中。
  11. 一种无线通信方法，其特征在于，包括：
    射频子系统生成本振信号；
    所述射频子系统根据所述本振信号在第一载波上发送第一信号，根据所述相同频率的本振信号在第二载波上接收第二信号；
    其中，所述第一载波的中心频率域所述第二载波的中心频率不同，所述射频子系统还提供数字变频操作，以补偿所述第一载波的中心频率和所述第二载波的中心频率之间的频率差异。
  12. 根据权利要求11所述的方法，其特征在于：
    所述本振信号的频率等于所述第一载波的中心频率，所述射频子系统提供的所述数字变频操作包括：
    所述射频子系统将所述第二信号通过所述数字变频操作转换为基带信号，其中，所述数字变频操作的频率大小为所述第一载波的中心频率和所述第二载波的中心频率之间的频率差异。
  13. 根据权利要求11所述的方法，其特征在于：
    所述本振信号的频率等于所述第二载波的中心频率，所述射频子系统提供的所述数字变频操作包括：
    所述射频子系统将基带信号通过所述数字变频操作转换为所述第一信号，其中，所述数字变频操作的频率大小为所述第一载波的中心频率和所述第二载波的中心频率之间的频率差异。
  14. 根据权利要求11至13任一所述的方法，其特征在于：
    所述第一载波包括一个成员载波，所述第二载波包括多个成员载波。
  15. 根据权利要求11至14任一所述的方法，其特征在于：
    所述第一载波和所述第二载波均为时分双工TDD载波，所述第一载波和所述第二载波位于相同的频带。
  16. 根据权利要求11至15任一所述的方法，其特征在于：
    所述第一载波和所述第二载波均位于第三代合作伙伴计划3GPP新无线电NR的技术规范的频率范围2。
  17. 一种射频子系统，其特征在于，包括：
    处理器和存储器；
    其中，所述存储器用于存储程序指令；
    所述处理器用于执行所述存储器中存储的程序指令，以使所述射频子系统实现所述权利要求11至16中任一项所述的方法。
  18. 一种射频子系统，其特征在于，包括：
    处理器和接口电路；
    其中，所述接口电路用于访问存储器，所述存储器中存储有程序指令；
    所述处理器用于通过所述接口电路访问所述存储器，并执行所述存储器中存储的程序指令，以使所述射频子系统实现所述权利要求11至16中任一项所述的方法。
  19. 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中存储了程序代码，所述程序代码被计算机执行时，实现所述权利要求11至16中任一项所述的方法。
  20. 一种计算机程序产品，其特征在于，所述计算机程序产品包含的程序代码被计算机执行时，实现所述权利要求11至16中任一项所述的方法。
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