Radio frequency system, radio distributed unit, and communication system

Abstract

The embodiments of the present application provide a radio frequency system, a radio distributed unit, and a communication system. The radio frequency system comprises an RRU and at least one RDU. The radio frequency system solves the problem of adaptation between the RRU and the RDU, and can realize N transmit and N receive of the RDU, thereby improving the data transmission efficiency. Moreover, the RRU can be adapted to an RDU having any frequency, such that the universality and compatibility of RRU devices are improved, thereby improving the deployment flexibility and reducing the cost.

Description

Radio frequency systems, radio frequency distributed units and communication systems Technical Field

[0001] The present application relates to the field of communication technology, and in particular to a radio frequency system, a radio frequency distributed unit, and a communication system. Background Art

[0002] The current solution to network coverage is to connect multiple radio remote units (RRUs) through a baseband unit (BBU) to achieve wide network coverage.

[0003] However, RRUs are inherently expensive and power-hungry, and deploying multiple RRUs requires multiple fiber optic cables and power supplies, further increasing the cost of deploying multiple RRUs. To address this issue, some RRU functions can be remotely located to form radio distributed units (RDUs), achieving wider coverage and reducing costs.

[0004] However, how to solve the adaptation problem between RRU and RDU needs further research.

[0005] Summary of the Invention

[0006] The embodiments of the present application provide a radio frequency system, a radio frequency distributed unit, and a communication system to ensure flexible adaptation between the RRU and the RDU.

[0007] In a first aspect, an embodiment of the present application provides a radio frequency system, including a radio frequency remote unit and a first radio frequency distributed unit, wherein the radio frequency remote unit is connected to the first radio frequency distributed unit; the frequencies of the N first downlink radio frequency signals output by the radio frequency remote unit are different from each other, and N is an integer greater than 1; the first radio frequency distributed unit includes N first radio frequency local oscillator units, N first downlink mixers and N first uplink mixers; the N first radio frequency local oscillator units and the N first downlink mixers each correspond one-to-one to the N first downlink radio frequency signals; each of the N first radio frequency local oscillator units is used to generate a first radio frequency local oscillator signal, and different first radio frequency local oscillator units The frequencies of the generated first RF local oscillator signals are different; each of the N first downlink mixers is used to mix the received first downlink RF signal with the first RF local oscillator signal received from the corresponding first RF local oscillator unit to obtain a first downlink service signal, and the frequency of the first downlink service signal is equal to the operating frequency of the first RF distributed unit; each of the N first uplink mixers is used to mix the first uplink service signal received from the corresponding antenna port with the first RF local oscillator signal received from the corresponding first RF local oscillator unit to obtain a first uplink RF signal, wherein the first uplink RF signals generated by different first uplink mixers are different from each other.

[0008] In the above solution, the RF distributed unit is provided with N RF local oscillator units, N downlink mixers, and N uplink mixers. In the downlink direction, the RF remote unit generates N downlink RF signals of different frequencies. The RF distributed unit can generate a downlink service signal with the same operating frequency as the RF distributed unit based on the downlink RF signal through the cooperation of the RF local oscillator unit and the downlink mixer. In the uplink direction, the RF distributed unit obtains an uplink service signal with the same operating frequency as the RF distributed unit. The RF local oscillator unit and the uplink mixer can generate an uplink RF signal adapted to the operating frequency of the RF remote unit based on the uplink service signal. This solution solves the adaptation problem between the RF remote unit and the RF distributed unit, and can realize N transmission and N reception of the RF distributed unit, thereby improving data transmission efficiency. In addition, the RF remote unit can adapt to RF distributed units of any frequency, improving the versatility and compatibility of the RF remote unit, thereby improving deployment flexibility and reducing costs.

[0009] In a possible implementation method, the radio remote unit includes a digital processing unit, and the digital processing unit is used to generate a reference clock signal, and the reference clock signal is used to generate the first radio frequency local oscillator signal.

[0010] In the above solution, the remote radio unit generates a reference clock signal, so that the first distributed radio unit can generate the first radio frequency local oscillator signal according to the reference clock signal, thereby improving the accuracy of the generated radio frequency local oscillator signal.

[0011] In one possible implementation method, the first RF distributed unit also includes N first switch units, the N first switch units corresponding one-to-one to the N first downlink RF signals, and each of the N first switch units is used to control the first RF distributed unit to receive or send service signals according to a control signal received from the RF remote unit; the digital processing unit is also used to generate the control signal.

[0012] In one possible implementation method, the first RF distributed unit also includes N first power amplifiers and N first low noise amplifiers, the N first power amplifiers correspond one-to-one to the N first downlink mixers, and the N first low noise amplifiers correspond one-to-one to the N first uplink mixers.

[0013] The above solution amplifies the signal through a power amplifier and amplifies and reduces the noise of the signal through a low-noise amplifier, which helps to improve the communication quality.

[0014] In a possible implementation method, the first RF distributed unit further includes N filters, the first uplink service signal is a signal selected by the filters, and the frequency of the first uplink service signal is equal to the operating frequency of the first RF distributed unit.

[0015] In a possible implementation method, the remote radio unit and the first distributed radio unit are connected via a cable, and multiple signals transmitted in the cable are frequency-division multiplexed.

[0016] In one possible implementation method, the radio frequency system further includes a second radio frequency distributed unit, and the radio frequency remote unit is connected to the second radio frequency distributed unit; the second radio frequency distributed unit includes N second radio frequency local oscillator units, N second downlink mixers and N second uplink mixers; the N second radio frequency local oscillator units and the N second downlink mixers correspond one-to-one to the N first downlink radio frequency signals; each of the N second radio frequency local oscillator units is used to generate a second radio frequency local oscillator signal, and different second radio frequency local oscillator units generate second radio frequency local oscillator signals with different frequencies; the N second Each second downlink mixer in the downlink mixer is used to mix the received second downlink RF signal with the second RF local oscillator signal received from the corresponding second RF local oscillator unit to obtain a second downlink service signal, and the frequency of the second downlink service signal is equal to the operating frequency of the second RF distributed unit; each second uplink mixer in the N second uplink mixers is used to mix the second uplink service signal received from the corresponding antenna port with the second RF local oscillator signal received from the corresponding second RF local oscillator unit to obtain a second uplink RF signal, wherein the second uplink RF signals generated by different second uplink mixers are different from each other.

[0017] In the above solution, one RF distributed unit can be connected to multiple RF distributed units, for example, the first RF distributed unit and the second RF distributed unit can be connected at the same time, which can expand the signal coverage range and help improve service capabilities.

[0018] In a possible implementation method, an operating frequency of the first distributed radio frequency unit is different from an operating frequency of the second distributed radio frequency unit.

[0019] In a second aspect, an embodiment of the present application provides a radio frequency system, including a radio frequency remote unit and a first radio frequency distributed unit, wherein the radio frequency remote unit is connected to the first radio frequency distributed unit; the radio frequency remote unit includes N-1 first radio frequency local oscillator units, where N is an integer greater than 1; the frequencies of the N first downlink radio frequency signals output by the radio frequency remote unit are different from each other, and the N-1 first downlink radio frequency signals among the N first downlink radio frequency signals are different from the operating frequencies of the first radio frequency distributed unit, and one first downlink radio frequency signal among the N first downlink radio frequency signals is the same as the operating frequency of the first radio frequency distributed unit; each first radio frequency local oscillator unit among the N-1 first radio frequency local oscillator units is used to generate a first radio frequency local oscillator signal, and the frequencies of the first radio frequency local oscillator signals generated by different first radio frequency local oscillator units are different; the N-1 first radio frequency local oscillator units are connected to the N-1 first The downlink RF signals correspond one to one; the first RF distributed unit includes N-1 first downlink mixers and N-1 first uplink mixers; the N-1 first downlink mixers correspond one to one with the N-1 first downlink RF signals; each of the N-1 first downlink mixers is used to mix the received first downlink RF signal with the first RF local oscillator signal received from the corresponding first RF local oscillator unit to obtain a first downlink service signal, and the frequency of the first downlink service signal is equal to the operating frequency of the first RF distributed unit; each of the N-1 first uplink mixers is used to mix the first uplink service signal received from the corresponding antenna port with the first RF local oscillator signal received from the corresponding first RF local oscillator unit to obtain a first uplink RF signal, wherein the first uplink RF signals generated by different first uplink mixers are different from each other.

[0020] In the above solution, for each RF distributed unit, the remote RF unit is equipped with N-1 RF local oscillator units corresponding to the RF distributed unit, and the RF distributed unit is equipped with corresponding N-1 downlink mixers and N-1 uplink mixers. In the downlink direction, the remote RF unit generates N downlink RF signals of different frequencies, one of which has the same frequency as the operating frequency of the RF distributed unit. The N-1 RF local oscillator units corresponding to the remote RF unit generate N-1 RF local oscillator signals. The remote RF unit then transmits the N downlink RF signals and the N-1 RF local oscillator signals to the RF distributed unit. The N-1 downlink mixers of the RF distributed unit generate N-1 downlink service signals based on the N-1 downlink RF signals and the N-1 RF local oscillator signals. The RF distributed unit then generates another downlink service signal based on another downlink RF signal among the N downlink RF signals. Thus, the RF distributed unit obtains N downlink service signals, and the frequencies of the N downlink service signals all have the same frequency as the operating frequency of the RF distributed unit. In the uplink direction, the RF distributed unit obtains N uplink service signals with the same operating frequency as the RF distributed unit. The N-1 uplink mixers of the RF distributed unit generate N-1 uplink RF signals based on the N-1 RF local oscillator signals and the N-1 uplink service signals among the N uplink service signals, and generate another uplink RF signal based on another uplink service signal among the N uplink service signals, thereby obtaining N uplink RF signals. The RF distributed unit sends the N uplink RF signals to the remote RF unit. This solution solves the adaptation problem between the remote RF unit and the RF distributed unit, and can realize N transmission and N reception of the RF distributed unit, thereby improving data transmission efficiency. In addition, the remote RF unit can adapt to RF distributed units of any frequency, improving the versatility and compatibility of the remote RF unit equipment, thereby improving deployment flexibility and reducing costs.

[0021] In a possible implementation method, the radio remote unit includes a digital processing unit, and the digital processing unit is used to generate a reference clock signal, and the reference clock signal is used to generate the first radio frequency local oscillator signal.

[0022] In the above solution, the radio remote unit generates a reference clock signal, so that the radio remote unit can generate a first radio frequency local oscillator signal according to the reference clock signal, thereby improving the accuracy of the generated radio frequency local oscillator signal.

[0023] In one possible implementation method, the first RF distributed unit also includes N first switch units, the N first switch units corresponding one-to-one to the N first downlink RF signals, and each of the N first switch units is used to control the first RF distributed unit to receive or send service signals according to a control signal received from the RF remote unit; the digital processing unit is also used to generate the control signal.

[0024] In one possible implementation method, the first RF distributed unit also includes N first power amplifiers and N first low-noise amplifiers, N-1 first power amplifiers among the N first power amplifiers correspond one-to-one to the N-1 first downlink mixers, and N-1 first low-noise amplifiers among the N first low-noise amplifiers correspond one-to-one to the N-1 first uplink mixers.

[0025] The above solution amplifies the signal through a power amplifier and amplifies and reduces the noise of the signal through a low-noise amplifier, which helps to improve the communication quality.

[0026] In a possible implementation method, the first RF distributed unit further includes N filters, the first uplink service signal is a signal selected by the filters, and the frequency of the first uplink service signal is equal to the operating frequency of the first RF distributed unit.

[0027] In a possible implementation method, the remote radio unit and the first distributed radio unit are connected via a cable, and multiple signals transmitted in the cable are frequency-division multiplexed.

[0028] In one possible implementation method, the radio frequency system also includes a second radio frequency distributed unit, and the radio frequency remote unit is connected to the second radio frequency distributed unit; the radio frequency remote unit includes N-1 second radio frequency local oscillator units; the frequencies of the N second downlink radio frequency signals output by the radio frequency remote unit are different from each other; N-1 second downlink radio frequency signals among the N second downlink radio frequency signals are different from the operating frequency of the second radio frequency distributed unit, and one second downlink radio frequency signal among the N second downlink radio frequency signals is the same as the operating frequency of the second radio frequency distributed unit; each second radio frequency local oscillator unit among the N-1 second radio frequency local oscillator units is used to generate a second radio frequency local oscillator signal, and the frequencies of the second radio frequency local oscillator signals generated by different second radio frequency local oscillator units are different; the N-1 second radio frequency local oscillator units are one-to-one with the N-1 second downlink radio frequency signals. The second RF distributed unit includes N-1 second downlink mixers and N-1 second uplink mixers; the N-1 second downlink mixers correspond one-to-one to the N-1 second downlink RF signals; each of the N-1 second downlink mixers is used to mix the received second downlink RF signal with the second RF local oscillator signal received from the corresponding second RF local oscillator unit to obtain a second downlink service signal, and the frequency of the second downlink service signal is equal to the operating frequency of the second RF distributed unit; each of the N-1 second uplink mixers is used to mix the second uplink service signal received from the corresponding antenna port with the second RF local oscillator signal received from the corresponding second RF local oscillator unit to obtain a second uplink RF signal, wherein the second uplink RF signals generated by different second uplink mixers are different from each other.

[0029] In the above solution, one RF distributed unit can be connected to multiple RF distributed units, for example, the first RF distributed unit and the second RF distributed unit can be connected at the same time, which can expand the signal coverage range and help improve service capabilities.

[0030] In a possible implementation method, an operating frequency of the first distributed radio frequency unit is different from an operating frequency of the second distributed radio frequency unit.

[0031] In a third aspect, an embodiment of the present application provides a radio frequency distributed unit, comprising: N radio frequency local oscillator units, N downlink mixers and N uplink mixers, where N is an integer greater than 1; the N radio frequency local oscillator units and the N downlink mixers each correspond one-to-one to N downlink radio frequency signals received from a radio frequency remote unit, and the frequencies of the N downlink radio frequency signals are different from each other; each of the N radio frequency local oscillator units is used to generate a radio frequency local oscillator signal, and the frequencies of the radio frequency local oscillator signals generated by different radio frequency local oscillator units are different; each of the N downlink mixers is used to mix the received downlink radio frequency signal with the radio frequency local oscillator signal received from the corresponding radio frequency local oscillator unit to obtain a downlink service signal, and the frequency of the downlink service signal is equal to the operating frequency of the radio frequency distributed unit; each of the N uplink mixers is used to mix the uplink service signal received from the corresponding antenna port with the radio frequency local oscillator signal received from the corresponding radio frequency local oscillator unit to obtain an uplink radio frequency signal, wherein the uplink radio frequency signals generated by different uplink mixers are different from each other.

[0032] In one possible implementation method, the RF distributed unit also includes N switch units, the N switch units corresponding one-to-one to the N downlink RF signals, and each of the N switch units is used to control the RF distributed unit to receive or send service signals according to the control signal received from the RF remote unit.

[0033] In a possible implementation method, the RF distributed unit further includes N power amplifiers and N low noise amplifiers, the N power amplifiers correspond one-to-one to the N downlink mixers, and the N low noise amplifiers correspond one-to-one to the N uplink mixers.

[0034] In a possible implementation method, the RF distributed unit further includes N filters, the uplink service signal is a signal selected by the filters, and the frequency of the uplink service signal is equal to the operating frequency of the RF distributed unit.

[0035] In a possible implementation method, the remote radio unit and the distributed radio unit are connected via a cable, and multiple signals transmitted in the cable are frequency-division multiplexed.

[0036] In a fourth aspect, an embodiment of the present application provides a radio frequency distributed unit, comprising N-1 downlink mixers and N-1 uplink mixers, where N is an integer greater than 1; the N-1 downlink mixers correspond one-to-one to N-1 downlink radio frequency signals among the N downlink radio frequency signals received from the radio frequency remote unit, and the frequencies of the N downlink radio frequency signals are different from each other; each downlink mixer in the N-1 downlink mixers is used to mix the received downlink radio frequency signal with the radio frequency local oscillator signal to obtain a downlink service signal, and the frequency of the downlink service signal is equal to the operating frequency of the radio frequency distributed unit; each uplink mixer in the N-1 uplink mixers is used to mix the uplink service signal received from the corresponding antenna port with the radio frequency local oscillator signal to obtain an uplink radio frequency signal, wherein the uplink radio frequency signals generated by different uplink mixers are different from each other.

[0037] In one possible implementation method, the RF distributed unit also includes N switch units, the N switch units corresponding one-to-one to the N downlink RF signals, and each of the N switch units is used to control the RF distributed unit to receive or send service signals according to the control signal received from the RF remote unit.

[0038] In one possible implementation method, the RF distributed unit also includes N power amplifiers and N low-noise amplifiers, N-1 power amplifiers among the N power amplifiers correspond one-to-one to the N-1 downlink mixers, and N-1 low-noise amplifiers among the N low-noise amplifiers correspond one-to-one to the N-1 uplink mixers.

[0039] In a possible implementation method, the RF distributed unit further includes N filters, the uplink service signal is a signal selected by the filters, and the frequency of the uplink service signal is equal to the operating frequency of the RF distributed unit.

[0040] In a possible implementation method, the remote radio unit and the distributed radio unit are connected via a cable, and multiple signals transmitted in the cable are frequency-division multiplexed.

[0041] In a fifth aspect, an embodiment of the present application provides a communication method, which can be executed by a radio frequency remote unit or a module (such as a chip) of the radio frequency remote unit. The method includes: obtaining capability information of the radio frequency distributed unit, the capability information of the radio frequency distributed unit including the power range supported by the radio frequency distributed unit and / or the transceiver frequency range supported by the radio frequency distributed unit; when the information of the first cell accessed by the radio frequency distributed unit matches the capability information of the radio frequency distributed unit, sending the frequency of the radio frequency local oscillator signal to the radio frequency distributed unit; wherein the information of the first cell includes the power of the first cell and / or the frequency of the first cell.

[0042] In this solution, the RRU and the RF distributed unit can negotiate to determine the frequency of the RF distributed unit's LO signal, enabling adaptation between the two units and ensuring normal communication between them. Furthermore, the RRU in this solution can adapt to RF distributed units with different operating frequencies, enabling flexible adaptation between the two units.

[0043] In a possible implementation method, when the information of the first cell accessed by the RF distributed unit matches the capability information of the RF distributed unit, the frequency of the RF local oscillator signal is sent to the RF distributed unit, including: when the information of the first cell matches the capability information of the RF distributed unit and the capability information of the remote RF unit, the frequency of the RF local oscillator signal is sent to the RF distributed unit; wherein the capability information of the remote RF unit includes the power range supported by the remote RF unit and / or the transmitting and receiving frequency range supported by the remote RF unit.

[0044] In a possible implementation method, the capability information of the RF distributed unit also includes the RF local oscillator frequency range supported by the RF distributed unit; when the information of the first cell accessed by the RF distributed unit matches the capability information of the RF distributed unit, the frequency size of the RF local oscillator signal is sent to the RF distributed unit, including: when the information of the first cell matches the capability information of the RF distributed unit and the frequency size of the RF local oscillator signal is included in the RF local oscillator frequency range supported by the RF distributed unit, the frequency size of the RF local oscillator signal is sent to the RF distributed unit.

[0045] In a sixth aspect, an embodiment of the present application provides a communication device, which may be a remote radio unit (RRU) or a module (e.g., a chip) of a remote radio unit. The device has the function of implementing any of the implementation methods of the fifth aspect described above. The function may be implemented by hardware or by hardware executing corresponding software. The hardware or software includes one or more modules corresponding to the above-described functions.

[0046] In a seventh aspect, an embodiment of the present application provides a communication device, comprising a unit or means for executing each step of any implementation method in the above-mentioned fifth aspect.

[0047] In an eighth aspect, an embodiment of the present application provides a communication device, comprising a processor and an interface circuit, wherein the processor is configured to communicate with other devices via the interface circuit and execute any implementation method in the fifth aspect. The processor comprises one or more.

[0048] In a ninth aspect, an embodiment of the present application provides a communication device, comprising a processor, the processor being configured to call a program to execute any implementation method in the fifth aspect. The processor may be one or more.

[0049] Optionally, the communication device may further include a memory, which is coupled to the processor and may be located inside or outside the device.

[0050] In the tenth aspect, an embodiment of the present application provides a communication device, comprising a processor; when the device is running, the processor executes computer instructions to enable the device to execute any implementation method in the above-mentioned fifth aspect.

[0051] Optionally, the communication device may further include a memory for storing the computer instructions.

[0052] In the eleventh aspect, an embodiment of the present application further provides a computer program product, which includes a computer program or instructions. When the computer program or instructions are run by a communication device, any implementation method in the above-mentioned fifth aspect is executed.

[0053] In the twelfth aspect, an embodiment of the present application further provides a computer-readable storage medium, wherein instructions are stored in the computer-readable storage medium, which, when run on a communication device, enables any implementation method in the above-mentioned fifth aspect to be executed.

[0054] In the thirteenth aspect, an embodiment of the present application also provides a chip system, including: a processor, used to execute any implementation method in the above-mentioned fifth aspect.

[0055] In a fourteenth aspect, an embodiment of the present application further provides a communication system, comprising a baseband unit, and a radio frequency system for executing any implementation method of the above-mentioned first aspect.

[0056] In a fifteenth aspect, an embodiment of the present application further provides a communication system, comprising a baseband unit, and a radio frequency system for executing any implementation method of the above-mentioned second aspect. BRIEF DESCRIPTION OF THE DRAWINGS

[0057] FIG1( a ) is a schematic diagram of a communication system provided in an embodiment of the present application;

[0058] FIG1( b ) is a schematic diagram of another communication system provided in an embodiment of the present application;

[0059] FIG2 is a schematic diagram of a radio frequency system provided in an embodiment of the present application;

[0060] FIG3 is an exemplary diagram of a radio frequency system provided in an embodiment of the present application;

[0061] FIG4 is a flow chart of a communication method provided in an embodiment of the present application;

[0062] FIG5 is a schematic diagram of another radio frequency system provided in an embodiment of the present application;

[0063] FIG6 is an exemplary diagram of another radio frequency system provided in an embodiment of the present application;

[0064] FIG7 is a flow chart of another communication method provided in an embodiment of the present application;

[0065] FIG8 is a schematic diagram of the structure of a communication device provided in an embodiment of the present application;

[0066] FIG9 is a schematic diagram of the structure of a communication device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0067] Figure 1(a) is a schematic diagram of a communication system provided in an embodiment of the present application. The communication system includes a baseband unit (BBU) and at least one radio remote unit (RRU). The BBU and RRU can be connected via optical fiber. Figure 1(a) takes an example of a communication system including one BBU and three RRUs. The communication system in the embodiment of the present application can also be understood as a distributed base station.

[0068] The BBU is responsible for processing baseband signals, including voice, data traffic, and signaling signals. It also handles encoding, parity checking, and error correction for various types of data. In the downlink, the BBU processes information received from the core network and sends it to the RRU for wireless signal transmission. In the uplink, the BBU receives information from the RRU, processes it, and sends it to the core network.

[0069] The RRU mainly includes functional units such as a power amplifier (PA), a low noise amplifier (LNA) and a filter, and also integrates an antenna. The power amplifier is used to amplify the power of the business signal to be transmitted, and the low noise amplifier is used to amplify the weak signal received from the outside and reduce noise interference, so that the RRU can demodulate the required information data. The filter is used to filter the signal and select the signal of the specified frequency. In the downlink direction, the RRU receives the signal from the BBU, and the power amplifier then amplifies the power of the signal, and the filter filters the business signal, and then transmits the signal through the antenna. In the uplink direction, the RRU receives the signal through the antenna, and the RRU's low noise amplifier then amplifies the power of the received signal and reduces the noise, and the RRU's filter filters the signal, and then the RRU sends the signal to the BBU.

[0070] In scenarios where multi-area coverage is required, such as residential area coverage and street coverage, multiple RRUs can be deployed to achieve multi-area coverage. However, this solution has the following problems:

[0071] First, deploying multiple RRUs will increase the network coverage cost due to the high power consumption and high cost of RRUs.

[0072] Second, when the BBU and RRU are connected through optical fiber, if there are multiple RRUs, the number of optical fibers will also be multiple sets, and the network coverage cost is high.

[0073] To solve the above problems, referring to Figure 1(b), an embodiment of the present application provides another communication system, which includes a BBU and one or more radio frequency systems, each of which includes an RRU and one or more radio distributed units (RDUs). A BBU is connected to the one or more RRUs via optical fiber. In the example shown in Figure 1(b), a BBU is connected to two radio frequency systems as an example, where radio frequency system 1 includes one RRU and three RDUs, and radio frequency system 2 also includes one RRU and three RDUs.

[0074] An RRU is connected to one or more RDUs via a cable (such as a feeder). The embodiments of the present application do not limit the names of the units included in the communication system. In future applications, the BBU, RRU, and RDU may have other names. For example, RDU may also be called a radio frequency unit, a radio frequency front end, a radio frequency front end unit, a sub-end, a radio frequency sub-end, or other names, which are not limited in this application. For example, RRU may also be called a radio frequency back end, a radio frequency back end unit, a mother end, a radio frequency mother end, or other names, which are not limited in this application.

[0075] The functions of the BBU in the communication system in FIG1( b ) are the same as those of the BBU in FIG1( a ), and are not described in detail.

[0076] Compared to the communication system in Figure 1(a), the communication system in Figure 1(b) adds an RDU. This can also be understood as some functional units of the RRU in Figure 1(a) (such as one or more of the filter, power amplifier, low-noise amplifier, or antenna) being remotely deployed to form one or more independent units, namely RDUs.

[0077] The above communication system connects one or more RDUs to the RRU. Remote RDUs achieve wide network coverage, thus reducing the number of RRUs deployed. Since the cost of deploying an RDU is significantly lower than that of deploying an RRU, reducing the number of RRUs reduces network coverage costs. Furthermore, since the RDUs are deployed remotely from the RRUs, the coverage area of ​​the architecture shown in Figure 1(a) can be increased, further improving network coverage while reducing network coverage costs.

[0078] It should be understood that any communication system involved in this application can be applied to the fourth generation (4G) mobile communication network, the fifth generation (5G) mobile communication network or future communication networks, such as the sixth generation mobile communication network, open access network communication network, etc., and this application is not limited.

[0079] For the above-mentioned radio frequency system, the operating frequencies of the RRU and RDU may be different. If one RRU is connected to multiple RDUs, the operating frequencies of the multiple RDUs may also be different from each other. How to adapt the RRU and RDU remains to be solved.

[0080] To ensure compatibility between the RRU and the RDU, the present application further improves the aforementioned radio frequency system, which is described in detail below.

[0081] Figure 2 is a schematic diagram of a radio frequency system provided in an embodiment of the present application. The radio frequency system includes an RRU and one or more RDUs. This embodiment of the present application does not limit the number of RDUs included in the radio frequency system. For example, the radio frequency system may include an RRU and a first RDU, or an RRU, a first RDU, a second RDU, and so on. Figure 2 illustrates an example of a radio frequency system including an RRU, a first RDU, and a second RDU.

[0082] Referring to Figure 2 , the RRU and the first RDU are connected, for example, via one or more cables. If connected via a single cable, multiple signals (such as control signals, power signals, RF signals, or reference clock signals) transmitted in the cable can be frequency-division multiplexed. If connected via multiple cables, each cable can carry a single signal or multiple signals in a frequency-division multiplexed manner.

[0083] The first RDU, the second RDU, the third RDU, and so on can all implement N transmission and N reception, where N is an integer greater than 1. In this embodiment, the number represented by N in different places refers to the same number. In FIG2 , N is taken as an example for illustration.

[0084] For each RDU connected to the RRU, the RRU can simultaneously send N RF signals to one RDU or simultaneously receive N RF signals from one RDU. The frequencies of the N RF signals are different from each other, but the magnitude of the frequencies of the N RF signals is a fixed value. Moreover, for each RDU connected to the RRU, the frequencies of the N RF signals corresponding to each RDU are the same. For example, if the frequencies of the N RF signals sent or received by the RRU to the first RDU are a1, a2, ..., aN, respectively, then the frequencies of the N RF signals sent or received by the RRU to the second RDU, the third RDU, etc. are also a1, a2, ..., aN.

[0085] In the downlink direction, the RRU can simultaneously output N downlink RF signals to the first RDU, hereinafter referred to as N first downlink RF signals, and the frequencies of the N first downlink RF signals are different from each other and are all different from the operating frequency of the first RDU. The N first downlink RF signals can be generated by the RRU or received by the RRU from other devices. In the uplink direction, the RRU can simultaneously receive N uplink RF signals from the first RDU, hereinafter referred to as N first uplink RF signals, and the frequencies of the N first uplink RF signals are different from each other. In the embodiment of the present application, the first uplink RF signal and the first downlink RF signal are collectively referred to as the first RF signal.

[0086] The first RDU includes N first RF local oscillator units, N first downlink mixers, and N first uplink mixers. The N first RF local oscillator units and the N first downlink mixers correspond one-to-one to the N first downlink RF signals. Each of the N first RF local oscillator units is used to generate a first RF local oscillator signal, and the frequencies of the first RF local oscillator signals generated by different first RF local oscillator units are different. Each of the N first downlink mixers is used to mix the received first downlink RF signal with the first RF local oscillator signal received from the corresponding first RF local oscillator unit to obtain a first downlink service signal, and the frequency of each first downlink service signal is equal to the operating frequency of the first RDU. Each of the N first uplink mixers is used to mix the first uplink service signal received from the corresponding antenna port with the first RF local oscillator signal received from the corresponding first RF local oscillator unit to obtain a first uplink RF signal, wherein the first uplink RF signals generated by different first uplink mixers are different from each other. Exemplarily, the first RDU also includes N filters, each first uplink mixer is connected to a filter, and after the antenna port receives various uplink signals, the uplink signal is sent to the corresponding filter. The filter then selects the uplink signal, discards the uplink signal with a different operating frequency from the first RDU, and sends the uplink signal with the same operating frequency as the first RDU to the corresponding first uplink mixer. Therefore, the frequency of the first uplink service signal received by the first mixer is equal to the operating frequency of the first RDU.

[0087] In the above solution, the RDU is provided with N RF local oscillator units, N downlink mixers, and N uplink mixers. In the downlink direction, the RRU generates N downlink RF signals of different frequencies. The RDU can generate a downlink service signal with the same operating frequency as the RDU based on the downlink RF signal through the cooperation of the RF local oscillator unit and the downlink mixer. In the uplink direction, the RDU obtains an uplink service signal with the same operating frequency as the RDU. Through the cooperation of the RF local oscillator unit and the uplink mixer, an uplink RF signal adapted to the operating frequency of the RRU can be generated based on the uplink service signal. This solution solves the adaptation problem between the RRU and the RDU, and can realize N transmission and N reception of the RDU, thereby improving data transmission efficiency. In addition, the RRU can adapt to RDUs of any frequency, which improves the versatility and compatibility of the RRU equipment, thereby improving deployment flexibility and reducing costs.

[0088] For example, the RRU may include a digital processing unit configured to generate a reference clock signal. The RRU may send the reference clock signal to the first RDU, so that the N first RF local oscillator units of the first RDU can each generate a first RF local oscillator signal based on the reference clock signal. Generating the RF local oscillator signal based on the reference clock signal improves the accuracy of the RF local oscillator signal.

[0089] Exemplarily, the first RDU may further include N first switch units, which correspond one-to-one to the N first downlink RF signals, and each of the N first switch units is used to control the first RDU to receive or send service signals according to the control signal received from the RRU. The control signal is generated by the digital processing unit of the RRU and sent to the first RDU. It can be understood that each first switch unit is used to control a pair of transceiver links of the first RDU. When the first switch unit indicates to start the transmit link, the pair of transceiver links of the first RDU is used to send downlink service signals, and when the first switch unit indicates to start the receive link, the pair of transceiver links of the first RDU is used to receive uplink service signals.

[0090] Exemplarily, the first RDU may further include N first PAs and N first LNAs, with the N first PAs corresponding one-to-one to the N first downlink mixers, and the N first LNAs corresponding one-to-one to the N first uplink mixers. The first PAs are configured to power amplify downlink service signals to be transmitted, and the first LNAs are configured to amplify weak signals received from an external source and reduce noise interference.

[0091] For example, the RRU and the first RDU may both include a power module. The RRU's power module may power the RRU. The RRU's power module may also generate a power signal and send the power signal to the power module of the first RDU, thereby powering the first RDU. In this manner, the RRU may provide DC power to the first RDU, thereby ensuring efficient and stable operation of the first RDU.

[0092] The above describes the internal structure and operating mode of the RRU and the first RDU. Other RDUs, such as the second and third RDUs, also have similar internal structures and operating modes to the first RDU. In this application, different RDUs are distinguished by the terms first, second, and third. The second RDU is described below, and the other RDUs are not described separately. The operating frequency of the second RDU can be the same as or different from the operating frequency of the first RDU.

[0093] Referring to Figure 2 , the RRU and the second RDU can be connected, for example, via one or more cables. If connected via a single cable, multiple signals transmitted in the cable (such as control signals, power signals, RF signals, or reference clock signals) can be frequency-division multiplexed. If connected via multiple cables, each cable can carry a single signal or multiple signals in a frequency-division multiplexed manner.

[0094] The second RDU can achieve N transmission and N reception. In the downlink direction, the RRU can simultaneously output N downlink RF signals to the second RDU, hereinafter referred to as N second downlink RF signals, and the frequencies of the N second downlink RF signals are different from each other and are all different from the operating frequency of the second RDU. The N second downlink RF signals can be generated by the RRU or received by the RRU from other devices. In the uplink direction, the RRU can simultaneously receive N uplink RF signals from the second RDU, hereinafter referred to as N second uplink RF signals, and the frequencies of the N second uplink RF signals are different from each other. In the embodiment of the present application, the second uplink RF signal and the second downlink RF signal are collectively referred to as the second RF signal.

[0095] The second RDU includes N second RF local oscillator units, N second downlink mixers, and N second uplink mixers. The N second RF local oscillator units and the N second downlink mixers correspond one-to-one to the N second downlink RF signals.

[0096] Each of the N second RF local oscillator units is used to generate a second RF local oscillator signal, and different second RF local oscillator units generate second RF local oscillator signals with different frequencies.

[0097] Each of the N second downlink mixers is used to mix the received second downlink RF signal with the second RF local oscillator signal received from the corresponding second RF local oscillator unit to obtain a second downlink service signal, and the frequency of each second downlink service signal is equal to the operating frequency of the second RDU.

[0098] Each of the N second uplink mixers is used to mix the second uplink service signal received from the corresponding antenna port and the second RF local oscillator signal received from the corresponding second RF local oscillator unit to obtain a second uplink RF signal, wherein the second uplink RF signals generated by different second uplink mixers are different from each other. Exemplarily, the second RDU also includes N filters, each second uplink mixer is connected to a filter, and after the antenna port receives various uplink signals, the uplink signal is sent to the corresponding filter, and then the filter selects the uplink signal, discards the uplink signal with a different operating frequency from the second RDU, and sends the uplink signal with the same operating frequency as the second RDU to the corresponding second uplink mixer, so that the frequency of the second uplink service signal received by the second mixer is equal to the operating frequency of the second RDU.

[0099] For example, the RRU may send a reference clock signal to the second RDU, so that the N second RF local oscillator units of the second RDU may respectively generate second RF local oscillator signals based on the reference clock signal. Since the RF local oscillator signals are generated based on the reference clock signal, the accuracy of the RF local oscillator signals can be improved.

[0100] Exemplarily, the second RDU may further include N second switch units, which correspond one-to-one to the N second downlink RF signals, and each of the N second switch units is used to control the second RDU to receive or send service signals according to the control signal received from the RRU. The control signal is generated by the digital processing unit of the RRU and sent to the second RDU. It can be understood that each second switch unit is used to control a pair of transceiver links of the second RDU. When the second switch unit indicates to start the transmit link, the pair of transceiver links of the second RDU is used to send downlink service signals, and when the second switch unit indicates to start the receive link, the pair of transceiver links of the second RDU is used to receive uplink service signals.

[0101] Exemplarily, the second RDU may further include N second PAs and N second LNAs, with the N second PAs corresponding one-to-one to the N second downlink mixers, and the N second LNAs corresponding one-to-one to the N second uplink mixers. The second PAs are configured to power amplify downlink service signals to be transmitted, and the second LNAs are configured to amplify weak signals received from the outside and reduce noise interference.

[0102] For example, the second RDU may further include a power module. The power module of the RRU may generate a power signal and transmit the power signal to the power module of the second RDU, thereby powering the second RDU. In this manner, the RRU may provide DC power to the second RDU, ensuring efficient and stable operation of the second RDU.

[0103] The radio frequency system of Figure 2 is described below with reference to the example shown in Figure 3. Referring to Figure 3, the RRU is connected to two RDUs, one operating at 3.5 GHz (hereinafter referred to as 3.5 GHz RDU) and the other operating at 2.3 GHz (hereinafter referred to as 2.3 GHz RDU).

[0104] The following describes the communication process between the RRU and the 3.5G RDU.

[0105] In the downlink direction, the RRU simultaneously outputs two downlink RF signals to the 3.5G RDU, namely a downlink RF signal with a frequency of 1G (hereinafter referred to as the 1G downlink RF signal) and a downlink RF signal with a frequency of 1.5G (hereinafter referred to as the 1.5G downlink RF signal). The RRU also sends a control signal to the 3.5G RDU, which is used to instruct the 3.5G RDU to send a service signal, and the RRU also sends a reference clock signal to the 3.5G RDU.

[0106] The 3.5G RDU sends the received 1G downlink RF signal to downlink mixer 1. RF local oscillator unit 1 generates a 2.5G RF local oscillator signal (hereinafter referred to as the 2.5G RF local oscillator signal) based on the received reference clock signal and sends the 2.5G RF local oscillator signal to downlink mixer 1. Downlink mixer 1 then generates a 3.5G downlink service signal (hereinafter referred to as the 3.5G downlink service signal) based on the received 1G downlink RF signal and the 2.5G RF local oscillator signal. The 3.5G downlink service signal is sent to PA1 for power amplification. The amplified 3.5G downlink service signal is then transmitted through the antenna. Alternatively, the amplified 3.5G downlink service signal is first sent to a filter for filtering and then transmitted through the antenna.

[0107] At the same time, the 3.5G RDU sends the received 1.5G downlink RF signal to downlink mixer 2. RF local oscillator unit 2 generates a 2G RF local oscillator signal (hereinafter referred to as the 2G RF local oscillator signal) based on the received reference clock signal and sends the 2G RF local oscillator signal to downlink mixer 2. Downlink mixer 2 then generates a 3.5G downlink service signal (hereinafter referred to as the 3.5G downlink service signal) based on the received 1.5G downlink RF signal and the 2G RF local oscillator signal. The 3.5G downlink service signal is sent to PA2 for power amplification. The amplified 3.5G downlink service signal is then transmitted through the antenna. Alternatively, the amplified 3.5G downlink service signal is first sent to the filter for filtering and then transmitted through the antenna.

[0108] The above completes the sending of two downlink service signals simultaneously in the downlink direction.

[0109] In the uplink direction, the 3.5G RDU receives multiple uplink service signals via antenna 1 and filters them through filter 1, retaining the 3.5G uplink service signals (hereinafter referred to as 3.5G uplink service signals). The 3.5G uplink service signals are then sent to the corresponding LNA 1 for amplification and noise reduction. The amplified and noise-reduced 3.5G uplink service signals are then sent to uplink mixer 1. RF local oscillator unit 1 generates a 2.5G RF local oscillator signal (hereinafter referred to as the 2.5G RF local oscillator signal) based on the received reference clock signal and sends the 2.5G RF local oscillator signal to uplink mixer 1. Uplink mixer 1 generates a 1G uplink RF signal (hereinafter referred to as the 1G uplink RF signal) based on the 2.5G RF local oscillator signal and the 3.5G uplink service signals and sends the 1G uplink RF signal to the RRU.

[0110] At the same time, the 3.5G RDU receives multiple uplink service signals via antenna 2 and filters them through filter 2, retaining the 3.5G uplink service signals (hereinafter referred to as the 3.5G uplink service signals). The 3.5G uplink service signals are then sent to the corresponding LNA 2 for amplification and noise reduction. The amplified and noise-reduced 3.5G uplink service signals are then sent to uplink mixer 2. RF local oscillator unit 2 generates a 2G RF local oscillator signal (hereinafter referred to as the 2G RF local oscillator signal) based on the received reference clock signal and sends the 2G RF local oscillator signal to uplink mixer 2. Uplink mixer 2 generates a 1.5G uplink RF signal (hereinafter referred to as the 1.5G uplink RF signal) based on the 2G RF local oscillator signal and the 3.5G uplink service signals and sends the 1.5G uplink RF signal to the RRU.

[0111] The above completes the simultaneous transmission of two uplink service signals in the uplink direction.

[0112] For the RDU with a frequency of 2.3G shown in Figure 3 (hereinafter referred to as 2.3G RDU), the process of transmitting and receiving service signals is similar to the process of transmitting and receiving service signals for the aforementioned 3.5G RDU. The difference is that the frequency of the RF local oscillator signal generated by the RF local oscillator unit 1 in the 2.3G RDU is 1.3G, and the frequency of the RF local oscillator signal generated by the RF local oscillator unit 2 is 0.8G.

[0113] The following describes the negotiation process between the RRU and RDU in the radio frequency system shown in FIG2 with reference to FIG4 .

[0114] Figure 4 is a flow chart of a communication method provided by an embodiment of the present application. The method is performed by an RRU or a module of the RRU (such as a chip), and an RDU or a module of the RDU (such as a chip). The following description uses the RRU and RDU as an example to illustrate the method. The RDU here can be any RDU connected to the RRU, such as a first RDU, a second RDU, a third RDU, and so on.

[0115] The method comprises the following steps:

[0116] Step 401: The RRU obtains the capability information of the RDU.

[0117] The capability information of the RDU includes a power range supported by the RDU and / or a transmitting and receiving frequency range supported by the RDU.

[0118] As an implementation method, the RRU may obtain the capability information of the RDU from the RDU. For example, the RDU reports the capability information of the RDU to the RRU after startup and initialization, or the RRU proactively requests the RDU to obtain the capability information of the RDU.

[0119] As another implementation method, the RRU may also obtain the RDU capability information from other devices such as a network management device.

[0120] Step 402: If the information of the first cell accessed by the RDU matches the capability information of the RDU, the RRU sends the frequency of the RF local oscillator signal to the RDU. Correspondingly, the RDU receives the frequency of the RF local oscillator signal.

[0121] The information of the first cell includes the power of the first cell and / or the frequency of the first cell.

[0122] For example, the power of the first cell is included in the power range supported by the RDU, and / or the frequency of the first cell is included in the transmit and receive frequency range supported by the RDU, indicating that the first cell can be carried on the RDU. Therefore, the RRU determines the frequency of the RDU's RF local oscillator signal and sends the frequency of the RF local oscillator signal to the RDU. If the RDU supports N transmit and N receive, the RRU sends the frequency of N RF local oscillator signals to the RDU.

[0123] Taking the example in Figure 3 as an example, the RDU supports two transmit and two receive modes, that is, N is equal to 2. The RRU sends two RF local oscillator signals to the RDU at frequencies of 2.5 GHz (i.e., 3.5 GHz minus 1 GHz) and 2 GHz (i.e., 3.5 GHz minus 1.5 GHz). In other words, the RF local oscillator signal frequencies are determined based on the RDU's operating frequency (i.e., the frequency of the first cell) and the RRU's RF signal power.

[0124] As an implementation method, the above step 402 is specifically as follows: when the information of the first cell matches the capability information of the RDU and the capability information of the RRU, the RRU sends the frequency of the RF local oscillator signal to the RDU. The capability information of the RRU includes the power range supported by the RRU and / or the transceiver frequency range supported by the RRU. That is, not only is it required that the power of the first cell is included in the power range supported by the RDU, and / or the frequency of the first cell is included in the transceiver frequency range supported by the RDU, but it is also required that the power of the first cell is included in the power range supported by the RRU, and / or the frequency of the first cell is included in the transceiver frequency range supported by the RRU.

[0125] As an implementation method, step 402 specifically includes: when the information of the first cell matches the capability information of the RDU, and the frequency of the RF local oscillator signal determined by the RRU is included in the RF local oscillator frequency range supported by the RDU, the RRU sends the frequency of the RF local oscillator signal to the RDU, wherein the capability information of the RDU also includes the RF local oscillator frequency range supported by the RDU. That is, not only is it required that the power of the first cell is included in the power range supported by the RDU, and / or that the frequency of the first cell is included in the transceiver frequency range supported by the RDU, but it is also required that the frequency of the RF local oscillator signal determined by the RRU is included in the RF local oscillator frequency range supported by the RDU.

[0126] In this solution, the RRU and RDU can negotiate to determine the frequency of the RDU's RF local oscillator signal, enabling adaptation between the two and ensuring normal communication between them. Furthermore, the RRU in this solution can adapt to RDUs operating at different frequencies, enabling flexible adaptation between the two.

[0127] Another RF system is introduced below.

[0128] Figure 5 is a schematic diagram of another radio frequency system provided in an embodiment of the present application. The radio frequency system includes an RRU and one or more RDUs. This embodiment of the present application does not limit the number of RDUs included in the radio frequency system. For example, the radio frequency system includes an RRU and a first RDU, or includes an RRU, a first RDU, a second RDU, and so on. Figure 5 illustrates an example of a radio frequency system including an RRU, a first RDU, and a second RDU.

[0129] Referring to Figure 5 , the RRU and the first RDU are connected, for example, via one or more cables. If connected via a single cable, multiple signals transmitted in the cable (such as control signals, power signals, RF signals, or reference clock signals) can be frequency-division multiplexed. If connected via multiple cables, each cable can carry a single signal or multiple signals in a frequency-division multiplexed manner.

[0130] The first RDU, the second RDU, the third RDU, and so on can all implement N transmission and N reception, where N is an integer greater than 1. In this embodiment, the number represented by N in different places refers to the same number. In FIG5 , N is taken as an example for explanation.

[0131] For each RDU connected to the RRU, the RRU can simultaneously send N RF signals to one RDU or simultaneously receive N RF signals from one RDU. The frequencies of the N RF signals are different from each other, but the magnitude of the frequencies of the N RF signals is a fixed value. Moreover, for each RDU connected to the RRU, the frequencies of the N RF signals corresponding to each RDU can be different from each other. For example, the frequencies of the N RF signals sent or received by the RRU to the first RDU are a1, a2, ..., aN, respectively; the frequencies of the N RF signals sent or received by the RRU to the second RDU are b1, b2, ..., bN, respectively; the frequencies of the N RF signals sent or received by the RRU to the third RDU are c1, c2, ..., cN, respectively, and so on. Among them, the size relationship between a1, a2, ..., aN and b1, b2, ..., bN is not limited, the size relationship between b1, b2, ..., bN and c1, c2, ..., cN is not limited, and the size relationship between a1, a2, ..., aN and c1, c2, ..., cN is not limited.

[0132] The RRU includes N-1 first RF local oscillator units, and the N-1 first RF local oscillator units correspond to the first RDU, where N is an integer greater than 1. The frequencies of the N first downlink RF signals output by the RRU are different from each other, and the N-1 first downlink RF signals among the N first downlink RF signals are different from the operating frequency of the first RDU, and one first downlink RF signal among the N first downlink RF signals is the same as the operating frequency of the first RDU. Each of the N-1 first RF local oscillator units is used to generate a first RF local oscillator signal, and different first RF local oscillator units generate first RF local oscillator signals with different frequencies. The N-1 first RF local oscillator units correspond one-to-one to the N-1 first downlink RF signals.

[0133] The first RDU includes N-1 first downlink mixers and N-1 first uplink mixers. The N-1 first downlink mixers correspond one-to-one to the N-1 first downlink RF signals. Each of the N-1 first downlink mixers is used to mix the received first downlink RF signal with the first RF local oscillator signal received from the corresponding first RF local oscillator unit to obtain a first downlink service signal, and the frequency of the first downlink service signal is equal to the operating frequency of the first RDU. Each of the N-1 first uplink mixers is used to mix the first uplink service signal received from the corresponding antenna port with the first RF local oscillator signal received from the corresponding first RF local oscillator unit to obtain a first uplink RF signal, wherein the first uplink RF signals generated by different first uplink mixers are different from each other.

[0134] In the above solution, for each RDU, the RRU is equipped with N-1 RF local oscillator units corresponding to the RDU, and the RDU is equipped with corresponding N-1 downlink mixers and N-1 uplink mixers. In the downlink direction, the RRU generates N downlink RF signals of different frequencies, one of which has the same frequency as the operating frequency of the RDU, and generates N-1 RF local oscillator signals through the N-1 RF local oscillator units corresponding to the RDU in the RRU. The RRU then sends N downlink RF signals and N-1 RF local oscillator signals to the RDU. The RDU's N-1 downlink mixers obtain N-1 downlink service signals based on the N-1 downlink RF signals and the N-1 RF local oscillator signals of the N downlink RF signals, and the RDU obtains another downlink service signal based on another downlink RF signal of the N downlink RF signals. As a result, the RDU obtains N downlink service signals, and the frequencies of the N downlink service signals are all the same as the operating frequency of the RDU. In the uplink direction, the RDU obtains N uplink service signals with the same operating frequency as the RDU. The RDU's N-1 uplink mixers generate N-1 uplink RF signals based on the N-1 RF local oscillator signals and the N-1 uplink service signals in the N uplink service signals, and generate another uplink RF signal based on another uplink service signal in the N uplink service signals, thereby obtaining N uplink RF signals. The RDU sends these N uplink RF signals to the RRU. This solution solves the adaptation problem between the RRU and the RDU, and can realize N transmission and N reception of the RDU, improving data transmission efficiency. In addition, the RRU can adapt to RDUs of any frequency, improving the versatility and compatibility of the RRU equipment, thereby improving deployment flexibility and reducing costs.

[0135] For example, the RRU may include a digital processing unit configured to generate a reference clock signal, so that the N-1 first RF local oscillator units of the RRU can each generate a first RF local oscillator signal based on the reference clock signal, thereby obtaining N-1 first RF local oscillator signals. Generating the RF local oscillator signals based on the reference clock signal improves the accuracy of the RF local oscillator signals.

[0136] Exemplarily, the first RDU may further include N first switch units, which correspond one-to-one to the N first downlink RF signals, and each of the N first switch units is used to control the first RDU to receive or send service signals according to the control signal received from the RRU. The control signal is generated by the digital processing unit of the RRU and sent to the first RDU. It can be understood that each first switch unit is used to control a pair of transceiver links of the first RDU. When the first switch unit indicates to start the transmit link, the pair of transceiver links of the first RDU is used to send downlink service signals, and when the first switch unit indicates to start the receive link, the pair of transceiver links of the first RDU is used to receive uplink service signals.

[0137] Exemplarily, the first RDU may further include N first PAs and N first LNAs, with the N first PAs corresponding one-to-one to the N first downlink mixers, and the N first LNAs corresponding one-to-one to the N first uplink mixers. The first PAs are configured to power amplify downlink service signals to be transmitted, and the first LNAs are configured to amplify weak signals received from an external source and reduce noise interference.

[0138] For example, the RRU and the first RDU may both include a power module. The RRU's power module may power the RRU. The RRU's power module may also generate a power signal and send the power signal to the power module of the first RDU, thereby powering the first RDU. In this manner, the RRU may provide DC power to the first RDU, thereby ensuring efficient and stable operation of the first RDU.

[0139] The above describes the internal structure and operating mode of the RRU and the first RDU. Other RDUs, such as the second and third RDUs, also have similar internal structures and operating modes to the first RDU. In this application, different RDUs are distinguished by the terms first, second, and third. The second RDU is described below, and the other RDUs are not described separately. The operating frequency of the second RDU can be the same as or different from the operating frequency of the first RDU.

[0140] Referring to Figure 5 , the RRU and the second RDU can be connected, for example, via one or more cables. If connected via a single cable, multiple signals (such as control signals, power signals, RF signals, or reference clock signals) transmitted in the cable can be frequency-division multiplexed. If connected via multiple cables, each cable can carry a single signal or multiple signals in a frequency-division multiplexed manner.

[0141] The RRU also includes N-1 second RF local oscillator units, which correspond to the second RDU, where N is an integer greater than 1. The frequencies of the N second downlink RF signals output by the RRU are different from each other, and N-1 of the N second downlink RF signals are different from the operating frequency of the second RDU, and one of the N second downlink RF signals is the same as the operating frequency of the second RDU. Each of the N-1 second RF local oscillator units is used to generate a second RF local oscillator signal, and different second RF local oscillator units generate second RF local oscillator signals with different frequencies. The N-1 second RF local oscillator units correspond one-to-one to the N-1 second downlink RF signals.

[0142] The second RDU includes N-1 second downlink mixers and N-1 second uplink mixers. The N-1 second downlink mixers correspond one-to-one to the N-1 second downlink RF signals. Each of the N-1 second downlink mixers is used to mix the received second downlink RF signal with the second RF local oscillator signal received from the corresponding second RF local oscillator unit to obtain a second downlink service signal, and the frequency of the second downlink service signal is equal to the operating frequency of the second RDU. Each of the N-1 second uplink mixers is used to mix the second uplink service signal received from the corresponding antenna port with the second RF local oscillator signal received from the corresponding second RF local oscillator unit to obtain a second uplink RF signal, wherein the second uplink RF signals generated by different second uplink mixers are different from each other.

[0143] For example, the N-1 second RF local oscillator units of the RRU can each generate a second RF local oscillator signal based on a reference clock signal generated by the digital processing unit of the RRU, thereby obtaining N-1 second RF local oscillator signals. Generating the RF local oscillator signals based on the reference clock signal improves the accuracy of the RF local oscillator signals.

[0144] Exemplarily, the second RDU may further include N second switch units, which correspond one-to-one to the N second downlink RF signals, and each of the N second switch units is used to control the second RDU to receive or send service signals according to the control signal received from the RRU. The control signal is generated by the digital processing unit of the RRU and sent to the second RDU. It can be understood that each second switch unit is used to control a pair of transceiver links of the second RDU. When the second switch unit indicates to start the transmit link, the pair of transceiver links of the second RDU is used to send downlink service signals, and when the second switch unit indicates to start the receive link, the pair of transceiver links of the second RDU is used to receive uplink service signals.

[0145] Exemplarily, the second RDU may further include N second PAs and N second LNAs, with the N second PAs corresponding one-to-one to the N second downlink mixers, and the N second LNAs corresponding one-to-one to the N second uplink mixers. The second PAs are configured to power amplify downlink service signals to be transmitted, and the second LNAs are configured to amplify weak signals received from the outside and reduce noise interference.

[0146] For example, the second RDU may further include a power module. The power module of the RRU sends a power signal to the power module of the second RDU, thereby powering the second RDU. In this manner, the RRU can provide DC power to the second RDU, ensuring efficient and stable operation of the second RDU.

[0147] As can be seen, for the RF system shown in Figure 5, the RRU is equipped with (N-1)*M RF local oscillator units, where M is the maximum number of RDUs connected to the RRU and N is the maximum number of simultaneous signal transmission and reception supported by each RDU. For example, if the RRU is connected to three RDUs, namely the first RDU, the second RDU, and the third RDU, the RF local oscillator units provided in the RRU specifically include: N-1 first RF local oscillator units corresponding to the first RDU, N-1 second RF local oscillator units corresponding to the second RDU, and N-1 third RF local oscillator units corresponding to the third RDU.

[0148] The radio frequency system of Figure 5 is described below with reference to the example shown in Figure 6. Referring to Figure 6, the RRU is connected to two RDUs, one operating at 3.5 GHz (hereinafter referred to as 3.5 GHz RDU) and the other operating at 2.3 GHz (hereinafter referred to as 2.3 GHz RDU).

[0149] The following describes the communication process between the RRU and the 3.5G RDU.

[0150] In the downlink direction, the RRU simultaneously outputs two downlink RF signals and one RF local oscillator signal to the 3.5G RDU. The two downlink RF signals are a downlink RF signal with a frequency of 1.5G (hereinafter referred to as the 1.5G downlink RF signal) and a downlink RF signal with a frequency of 3.5G (hereinafter referred to as the 3.5G downlink RF signal). The RF local oscillator signal is determined by the RF local oscillator unit 1 based on the 1.5G downlink RF signal and the reference clock signal generated by the digital processing unit. The power of the RF local oscillator signal is 2G (i.e., 3.5G minus 1.5G). This RF local oscillator signal is hereinafter referred to as the 2G RF local oscillator signal. At the same time, the RRU also sends a control signal to the 3.5G RDU, which is used to instruct the 3.5G RDU to send service signals.

[0151] The 3.5G RDU sends the received 1.5G downlink RF signal and 2G RF local oscillator signal to the downlink mixer. The downlink mixer then generates a downlink service signal with a frequency of 3.5G (hereinafter referred to as the 3.5G downlink service signal) based on the received 1.5G downlink RF signal and 2G RF local oscillator signal. The 3.5G downlink service signal is sent to PA1 for power amplification. The amplified 3.5G downlink service signal is then transmitted through the antenna. Alternatively, the amplified 3.5G downlink service signal is first sent to the filter for filtering and then transmitted through the antenna.

[0152] At the same time, the 3.5G RDU generates a downlink service signal with a power of 3.5G (hereinafter referred to as the 3.5G downlink service signal) based on the received 3.5G downlink RF signal, and sends the 3.5G downlink service signal to PA2 for power amplification. The amplified 3.5G downlink service signal is then transmitted through the antenna, or the amplified 3.5G downlink service signal is first sent to the filter for filtering and then transmitted through the antenna.

[0153] The above completes the sending of two downlink service signals simultaneously in the downlink direction.

[0154] In the uplink direction, the 3.5G RDU receives multiple uplink service signals through antenna 1 and filters them through filter 1, retaining the uplink service signals with a frequency of 3.5G (hereinafter referred to as the 3.5G uplink service signals). The 3.5G uplink service signals are then sent to the corresponding LNA 1 for signal amplification and noise reduction. The amplified and noise-reduced 3.5G uplink service signals are then sent to the uplink mixer. Uplink mixer 1 generates an uplink RF signal with a frequency of 1.5G (hereinafter referred to as the 1.5G uplink RF signal) based on the 2G RF local oscillator signal and the 3.5G uplink service signal, and sends the 1.5G uplink RF signal to the RRU.

[0155] At the same time, the 3.5G RDU receives multiple uplink service signals through antenna 2, filters the received signals through filter 2, retains the uplink service signals with a frequency of 3.5G (hereinafter referred to as 3.5G uplink service signals), and then sends the 3.5G uplink service signals to the corresponding LNA2 for signal amplification and noise reduction. After that, the 3.5G RDU generates an uplink RF signal with a frequency of 3.5G (hereinafter referred to as 3.5G uplink RF signal) based on the 3.5G uplink service signals after signal amplification and noise reduction, and sends the 3.5G uplink RF signal to the RRU.

[0156] The above completes the simultaneous transmission of two uplink service signals in the uplink direction.

[0157] For the RDU with a frequency of 2.3G shown in Figure 6 (hereinafter referred to as 2.3G RDU), the process of transmitting and receiving service signals is similar to the process of transmitting and receiving service signals for the aforementioned 3.5G RDU, with the difference that the frequency of the RF local oscillator signal generated by the RF local oscillator unit 2 in the RRU is 1.3G (i.e., 2.3G minus 1G).

[0158] The following describes the negotiation process between the RRU and RDU in the radio frequency system shown in FIG5 with reference to FIG7 .

[0159] Figure 7 is a flow chart of a communication method provided by an embodiment of the present application. The method is performed by an RRU or a module of the RRU (such as a chip), and an RDU or a module of the RDU (such as a chip). The following description uses the RRU and RDU as an example to illustrate the method. The RDU here can be any RDU connected to the RRU, such as a first RDU, a second RDU, a third RDU, and so on.

[0160] The method comprises the following steps:

[0161] Step 701: The RRU obtains the capability information of the RDU.

[0162] The capability information of the RDU includes a power range supported by the RDU and / or a transmitting and receiving frequency range supported by the RDU.

[0163] As an implementation method, the RRU may obtain the capability information of the RDU from the RDU. For example, the RDU reports the capability information of the RDU to the RRU after startup and initialization, or the RRU proactively requests the RDU to obtain the capability information of the RDU.

[0164] As another implementation method, the RRU may also obtain the RDU capability information from other devices such as a network management device.

[0165] Step 702: When the information of the first cell accessed by the RDU matches the capability information of the RDU, the RRU determines the frequency of the radio frequency local oscillator signal.

[0166] The information of the first cell includes the power of the first cell and / or the frequency of the first cell.

[0167] For example, if the power of the first cell is within the power range supported by the RDU and / or the frequency of the first cell is within the transmit and receive frequency range supported by the RDU, it indicates that the first cell supports providing services to the RDU. Therefore, the RRU determines the frequency of the RDU's RF local oscillator signal. If the RDU supports N transmit and N receive, the RRU determines the frequency of N-1 RF local oscillator signals corresponding to the RDU.

[0168] Taking the example in Figure 6 as an example, the RDU supports two transmit and two receive modes, that is, N is equal to 2. The RRU determines that the frequency of the RF local oscillator signal corresponding to RRU RF local oscillator unit 1 is 2 GHz, and the frequency of the RF local oscillator signal corresponding to RF local oscillator unit 2 is 1.3 GHz. In other words, the frequency of the RF local oscillator signal is determined based on the operating frequency of the RDU (that is, the frequency of the first cell) and the RF signal power of the RRU.

[0169] As an implementation method, the above step 702 is specifically as follows: when the information of the first cell matches the capability information of the RDU and the capability information of the RRU, the RRU determines the frequency of the RF local oscillator signal. The capability information of the RRU includes the power range supported by the RRU and / or the transceiver frequency range supported by the RRU. That is, not only is it required that the power of the first cell is included in the power range supported by the RDU, and / or the frequency of the first cell is included in the transceiver frequency range supported by the RDU, but it is also required that the power of the first cell is included in the power range supported by the RRU, and / or the frequency of the first cell is included in the transceiver frequency range supported by the RRU.

[0170] In this solution, the RRU and RDU can negotiate to determine the frequency of the RRU's RF local oscillator signal, enabling adaptation between the two and ensuring normal communication between them. Furthermore, the RRU in this solution can adapt to RDUs operating at different frequencies, enabling flexible adaptation between the two.

[0171] It should be noted that, in the radio frequency system shown in FIG5 , for each RDU connected to the RRU, N-1 radio frequency local oscillator units corresponding to the PDU are provided in the RRU. Accordingly, the frequencies of N-1 radio frequency signals among the N radio frequency signals received or sent by the RRU are different from the operating frequency of the RDU, and the frequency of another radio frequency signal among the N radio frequency signals is the same as the operating frequency of the RDU. In another implementation method, for the radio frequency system shown in FIG5 , N radio frequency local oscillator units corresponding to the PDU may also be provided in the RRU. Accordingly, the frequencies of the N radio frequency signals received or sent by the RRU are all different from the operating frequency of the RDU. Taking the example in Figure 6 as an example, for a 3.5G RDU, assuming that the power of the RF signal received or transmitted by the RRU is 1.5G and 1.8G respectively, two RF local oscillator units corresponding to the 3.5G RDU can be configured in the RRU, with one RF local oscillator unit generating a RF local oscillator signal with a power of 2G (i.e., 3.5G minus 1.5G) and the other RF local oscillator unit generating a RF local oscillator signal with a power of 1.7G (i.e., 3.5G minus 1.8G). Similarly, for a 2.3G RDU, assuming that the power of the RF signal received or transmitted by the RRU is 1G and 1.2G respectively, two RF local oscillator units corresponding to the 2.3G RDU can be configured in the RRU, with one RF local oscillator unit generating a RF local oscillator signal with a power of 1.3G (i.e., 2.3G minus 1G) and the other RF local oscillator unit generating a RF local oscillator signal with a power of 1.1G (i.e., 2.3G minus 1.2G).

[0172] It is understood that to implement the functions in the above embodiments, the RRU or RDU includes hardware structures and / or software modules corresponding to each function. Those skilled in the art should readily appreciate that, in conjunction with the various exemplary units and method steps described in the embodiments disclosed herein, the present application can be implemented in the form of hardware or a combination of hardware and computer software. Whether a function is implemented in hardware or in a hardware-driven manner by computer software depends on the specific application scenario and design constraints of the technical solution.

[0173] Figures 8 and 9 are schematic diagrams of the structures of possible communication devices provided in embodiments of the present application. These communication devices can be used to implement the functions of the RRU or RDU in the above-mentioned method embodiments, thereby also achieving the beneficial effects of the above-mentioned method embodiments. In the embodiments of the present application, the communication device can be an RRU or RDU, or a module (such as a chip) applied to the RRU or RDU.

[0174] The communication device 800 shown in Figure 8 includes a processing unit 810 and a transceiver unit 820. The communication device 800 is used to implement the functions of the RRU or RDU in the above method embodiment.

[0175] When the communication device 800 is used to implement the functions of the RRU in the above method embodiment, the processing unit 810 is used to obtain capability information of the RF distributed unit, where the capability information of the RF distributed unit includes the power range supported by the RF distributed unit and / or the transceiver frequency range supported by the RF distributed unit; the transceiver unit 820 is used to send the frequency of the RF local oscillator signal to the RF distributed unit when the information of the first cell accessed by the RF distributed unit matches the capability information of the RF distributed unit; wherein the information of the first cell includes the power of the first cell and / or the frequency of the first cell.

[0176] In one possible implementation method, the transceiver unit 820 is used to send the frequency size of the RF local oscillator signal to the RF distributed unit when the information of the first cell accessed by the RF distributed unit matches the capability information of the RF distributed unit, specifically including: sending the frequency size of the RF local oscillator signal to the RF distributed unit when the information of the first cell matches both the capability information of the RF distributed unit and the capability information of the remote RF unit; wherein the capability information of the remote RF unit includes the power range supported by the remote RF unit and / or the transceiver frequency range supported by the remote RF unit.

[0177] In one possible implementation method, the capability information of the RF distributed unit also includes the RF local oscillator frequency range supported by the RF distributed unit; the transceiver unit 820 is used to send the frequency size of the RF local oscillator signal to the RF distributed unit when the information of the first cell accessed by the RF distributed unit matches the capability information of the RF distributed unit, specifically including: sending the frequency size of the RF local oscillator signal to the RF distributed unit when the information of the first cell matches the capability information of the RF distributed unit and the frequency size of the RF local oscillator signal is included in the RF local oscillator frequency range supported by the RF distributed unit.

[0178] For a more detailed description of the processing unit 810 and the transceiver unit 820, reference can be made to the relevant description in the above method embodiment, which will not be repeated here.

[0179] The communication device 900 shown in Figure 9 includes a processor 910 and an interface circuit 920. The processor 910 and the interface circuit 920 are coupled to each other. It is understood that the interface circuit 920 can be a transceiver or an input / output interface. Optionally, the communication device 900 may also include a memory 930 for storing instructions executed by the processor 910, or storing input data required by the processor 910 to execute instructions, or storing data generated after the processor 910 executes instructions.

[0180] When the communication device 900 is used to implement the above method embodiment, the processor 910 is used to implement the functions of the above processing unit 810 , and the interface circuit 920 is used to implement the functions of the above transceiver unit 820 .

[0181] It is understood that the processor in the embodiments of the present application may be a central processing unit (CPU), or may be other general-purpose processors, digital signal processors (DSP), application-specific integrated circuits (ASIC), field programmable gate arrays (FPGA), or other programmable logic devices, transistor logic devices, hardware components, or any combination thereof. The general-purpose processor may be a microprocessor or any conventional processor.

[0182] The method steps in the embodiments of the present application can be implemented by hardware or by a processor executing software instructions. The software instructions can be composed of corresponding software modules, and the software modules can be stored in random access memory, flash memory, read-only memory, programmable read-only memory, erasable programmable read-only memory, electrically erasable programmable read-only memory, registers, hard disks, mobile hard disks, compact disc read-only memory (CD-ROM) or any other form of storage medium well known in the art. An exemplary storage medium is coupled to the processor so that the processor can read information from the storage medium and write information to the storage medium. Of course, the storage medium can also be an integral part of the processor. The processor and the storage medium can be located in an ASIC. In addition, the ASIC can be located in an RRU or an RDU.

[0183] In the above embodiments, all or part of the embodiments may be implemented by software, hardware, firmware, or any combination thereof. When implemented by software, all or part of the embodiments may be implemented in the form of a computer program product.

[0184] The computer program product includes one or more computer programs or instructions. A computer program is a set of instructions that instructs a computer or other device with message processing capabilities to perform each step of the process. It is typically written in a programming language and runs on a target architecture. When the computer program or instructions are loaded and executed on a computer, the process or functions described in the embodiments of this application are fully or partially executed.

[0185] The computer may be a general purpose computer, a special purpose computer, a computer network, or other programmable device.

[0186] The computer program or instructions may be stored in a computer-readable storage medium or transmitted from one computer-readable storage medium to another computer-readable storage medium. For example, the computer program or instructions may be transmitted from one website, computer, server, or data center to another website, computer, server, or data center via wired or wireless means.

[0187] 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 that integrates one or more available media.

[0188] The available medium may be a magnetic medium, such as a floppy disk, a hard disk, or a magnetic tape; an optical medium, such as a digital video disk; or a semiconductor medium, such as a solid-state drive. The computer-readable storage medium may be a volatile or non-volatile storage medium, or may include both volatile and non-volatile types of storage media.

[0189] In the various embodiments of the present application, unless otherwise specified or there is a logical conflict, the terms and / or descriptions between different embodiments are consistent and can be referenced by each other. The technical features in different embodiments can be combined to form new embodiments according to their inherent logical relationships.

[0190] In this application, "at least one" means one or more, and "more" means two or more. "And / or" describes the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can mean: A exists alone, A and B exist at the same time, and B exists alone, where A and B can be singular or plural. In the text description of this application, the character " / " generally indicates that the previous and next related objects are in an "or" relationship; in the formulas of this application, the character " / " indicates that the previous and next related objects are in a "division" relationship.

[0191] It is understood that the various numbers used in the embodiments of this application are merely for ease of description and are not intended to limit the scope of the embodiments of this application. The order of the sequence numbers of the above-mentioned processes does not necessarily imply a specific order of execution; the order of execution of the processes should be determined by their functions and inherent logic.

Claims

1. A radio frequency system, characterized in that, it includes a radio frequency remote unit and a first radio frequency distributed unit, and the radio frequency remote unit is connected to the first radio frequency distributed unit; the frequencies of N first downlink radio frequency signals output by the radio frequency remote unit are different from each other, where N is an integer greater than 1; the first radio frequency distributed unit includes N first radio frequency local oscillator units, N first downlink mixers and N first uplink mixers; the N first radio frequency local oscillator units and the N first downlink mixers correspond to the N first downlink radio frequency signals one by one; each of the N first radio frequency local oscillator units is used to generate a first radio frequency local oscillator signal, and the frequencies of the first radio frequency local oscillator signals generated by different first radio frequency local oscillator units are different; each of the N first downlink mixers is used to mix the received first downlink radio frequency signal and the first radio frequency local oscillator signal received from the corresponding first radio frequency local oscillator unit to obtain a first downlink service signal, and the frequency of the first downlink service signal is equal to the operating frequency of the first radio frequency distributed unit; each of the N first uplink mixers is used to mix the first uplink service signal received from the corresponding antenna port and the first radio frequency local oscillator signal received from the corresponding first radio frequency local oscillator unit to obtain a first uplink radio frequency signal, where the first uplink radio frequency signals generated by different first uplink mixers are different from each other.

2. The radio frequency system according to claim 1, characterized in that, the radio frequency remote unit includes a digital processing unit, and the digital processing unit is used to generate a reference clock signal, and the reference clock signal is used for the generation of the first radio frequency local oscillator signal.

3. The radio frequency system according to claim 2, characterized in that, the first radio frequency distributed unit further includes N first switch units, the N first switch units correspond to the N first downlink radio frequency signals one by one, and each of the N first switch units is used to control the first radio frequency distributed unit to receive or send service signals according to the control signal received from the radio frequency remote unit; the digital processing unit is further used to generate the control signal.

4. The radio frequency system according to any one of claims 1 to 3, characterized in that, the first radio frequency distributed unit further includes N first power amplifiers and N first low noise amplifiers, the N first power amplifiers correspond to the N first downlink mixers one by one, and the N first low noise amplifiers correspond to the N first uplink mixers one by one.

5. The radio frequency system according to any one of claims 1 to 4, characterized in that, the first radio frequency distributed unit further includes N filters, the first uplink service signal is the signal selected by the filter, and the frequency of the first uplink service signal is equal to the operating frequency of the first radio frequency distributed unit.

6. The radio frequency system according to any one of claims 1 to 5, characterized in that, The radio frequency remote unit is connected to the first radio frequency distributed unit through a cable, and multiple signals transmitted in the cable are frequency division multiplexed.

7. The radio frequency system according to any one of claims 1 to 6, wherein, the radio frequency system further includes a second radio frequency distributed unit, and the radio frequency remote unit is connected to the second radio frequency distributed unit; the second radio frequency distributed unit includes N second radio frequency local oscillator units, N second down-conversion mixers and N second up-conversion mixers; the N second radio frequency local oscillator units, the N second down-conversion mixers correspond to the N first downlink radio frequency signals one by one; each of the N second radio frequency local oscillator units is used to generate a second radio frequency local oscillator signal, and the frequencies of the second radio frequency local oscillator signals generated by different second radio frequency local oscillator units are different; each of the N second down-conversion mixers is used to mix the received second downlink radio frequency signal and the second radio frequency local oscillator signal received from the corresponding second radio frequency local oscillator unit to obtain a second downlink service signal, and the frequency of the second downlink service signal is equal to the operating frequency of the second radio frequency distributed unit; each of the N second up-conversion mixers is used to mix the second uplink service signal received from the corresponding antenna port and the second radio frequency local oscillator signal received from the corresponding second radio frequency local oscillator unit to obtain a second uplink radio frequency signal, wherein the second uplink radio frequency signals generated by different second up-conversion mixers are different from each other.

8. The radio frequency system according to claim 7, wherein, the operating frequency of the first radio frequency distributed unit is different from the operating frequency of the second radio frequency distributed unit.

9. A radio frequency system, wherein, it includes a radio frequency remote unit and a first radio frequency distributed unit, and the radio frequency remote unit is connected to the first radio frequency distributed unit; the radio frequency remote unit includes N - 1 first radio frequency local oscillator units, where N is an integer greater than 1; the frequencies of the N first downlink radio frequency signals output by the radio frequency remote unit are different from each other, N - 1 of the N first downlink radio frequency signals are different from the operating frequency of the first radio frequency distributed unit, and one of the N first downlink radio frequency signals is the same as the operating frequency of the first radio frequency distributed unit; each of the N - 1 first radio frequency local oscillator units It is used to generate a first radio frequency local oscillator signal, and the frequencies of the first radio frequency local oscillator signals generated by different first radio frequency local oscillator units are different; the N-1 first radio frequency local oscillator units correspond one-to-one to the N-1 first downlink radio frequency signals; the first radio frequency distributed unit includes N-1 first downlink mixers and N-1 first uplink mixers; the N-1 first downlink mixers correspond one-to-one to the N-1 first downlink radio frequency signals; each of the N-1 first downlink mixers is used to mix the received first downlink radio frequency signal and the first radio frequency local oscillator signal received from the corresponding first radio frequency local oscillator unit to obtain a first downlink service signal, and the frequency of the first downlink service signal is equal to the operating frequency of the first radio frequency distributed unit; each of the N-1 first uplink mixers is used to mix the first uplink service signal received from the corresponding antenna port and the first radio frequency local oscillator signal received from the corresponding first radio frequency local oscillator unit to obtain a first uplink radio frequency signal, wherein the first uplink radio frequency signals generated by different first uplink mixers are different from each other.

10. The radio frequency system according to claim 9, characterized in that, the radio frequency remote unit includes a digital processing unit, and the digital processing unit is used to generate a reference clock signal, and the reference clock signal is used for the generation of the first radio frequency local oscillator signal.

11. The radio frequency system according to claim 10, characterized in that, the first radio frequency distributed unit further includes N first switch units, the N first switch units correspond one-to-one to the N first downlink radio frequency signals, and each of the N first switch units is used to control the first radio frequency distributed unit to receive or send service signals according to the control signal received from the radio frequency remote unit; the digital processing unit is further used to generate the control signal.

12. The radio frequency system according to any one of claims 9 to 11, characterized in that, the first radio frequency distributed unit further includes N first power amplifiers and N first low noise amplifiers, N-1 of the N first power amplifiers correspond one-to-one to the N-1 first downlink mixers, and N-1 of the N first low noise amplifiers correspond one-to-one to the N-1 first uplink mixers.

13. The radio frequency system according to any one of claims 9 to 12, characterized in that, the first radio frequency distributed unit further includes N filters, the first uplink service signal is the signal selected by the filter, and the frequency of the first uplink service signal is equal to the operating frequency of the first radio frequency distributed unit.

14. The radio frequency system according to any one of claims 9 to 13, characterized in that, the radio frequency remote unit is connected to the first radio frequency distributed unit through a cable, and multiple signals transmitted in the cable are frequency division multiplexed.

15. The radio frequency system according to any one of claims 9 to 14, characterized in that, The radio frequency system further includes a second radio frequency distributed unit, and the radio frequency remote unit is connected to the second radio frequency distributed unit; The radio frequency remote unit includes N-1 second radio frequency local oscillator units; the frequencies of the N second downlink radio frequency signals output by the radio frequency remote unit are different from each other; N-1 of the N second downlink radio frequency signals are different from the operating frequency of the second radio frequency distributed unit, and one of the N second downlink radio frequency signals is the same as the operating frequency of the second radio frequency distributed unit; each of the N-1 second radio frequency local oscillator units is used to generate a second radio frequency local oscillator signal, and the frequencies of the second radio frequency local oscillator signals generated by different second radio frequency local oscillator units are different; the N-1 second radio frequency local oscillator units correspond one-to-one to the N-1 second downlink radio frequency signals; The second radio frequency distributed unit includes N-1 second downlink mixers and N-1 second uplink mixers; the N-1 second downlink mixers correspond one-to-one to the N-1 second downlink radio frequency signals; each of the N-1 second downlink mixers is used to mix the received second downlink radio frequency signal and the second radio frequency local oscillator signal received from the corresponding second radio frequency local oscillator unit to obtain a second downlink service signal, and the frequency of the second downlink service signal is equal to the operating frequency of the second radio frequency distributed unit; each of the N-1 second uplink mixers is used to mix the second uplink service signal received from the corresponding antenna port and the second radio frequency local oscillator signal received from the corresponding second radio frequency local oscillator unit to obtain a second uplink radio frequency signal, wherein the second uplink radio frequency signals generated by different second uplink mixers are different from each other.

16. The radio frequency system according to claim 15, wherein, the operating frequency of the first radio frequency distributed unit is different from the operating frequency of the second radio frequency distributed unit.

17. A radio frequency distributed unit, wherein, it includes: N radio frequency local oscillator units, N downlink mixers and N uplink mixers, where N is an integer greater than 1; the N radio frequency local oscillator units and the N downlink mixers all correspond one-to-one to the N downlink radio frequency signals received from the radio frequency remote unit, and the frequencies of the N downlink radio frequency signals are different from each other; each of the N radio frequency local oscillator units is used to generate a radio frequency local oscillator signal, and the frequencies of the radio frequency local oscillator signals generated by different radio frequency local oscillator units are different; each of the N downlink mixers is used to mix the received downlink radio frequency signal and the radio frequency local oscillator signal received from the corresponding radio frequency local oscillator unit to obtain a downlink service signal, and the frequency of the downlink service signal is equal to the operating frequency of the radio frequency distributed unit; each of the N uplink mixers is used to mix the uplink service signal received from the corresponding antenna port and the radio frequency local oscillator signal received from the corresponding radio frequency local oscillator unit to obtain an uplink radio frequency signal, wherein the uplink radio frequency signals generated by different uplink mixers are different from each other.

18. The radio frequency distributed unit according to claim 17, wherein, the radio frequency distributed unit further includes N switching units, the N switching units correspond to the N downlink radio frequency signals one by one, and each switching unit in the N switching units is configured to control the radio frequency distributed unit to receive or transmit service signals according to a control signal received from a remote radio unit.

19. The radio frequency distributed unit according to claim 17 or 18, wherein, the radio frequency distributed unit further includes N power amplifiers and N low-noise amplifiers, the N power amplifiers correspond to the N downlink mixers one by one, and the N low-noise amplifiers correspond to the N uplink mixers one by one.

20. The radio frequency distributed unit according to any one of claims 17 to 19, wherein, the radio frequency distributed unit further includes N filters, the uplink service signal is a signal selected by the filters, and the frequency of the uplink service signal is equal to the operating frequency of the radio frequency distributed unit.

21. The radio frequency distributed unit according to any one of claims 17 to 20, wherein, the remote radio unit is connected to the radio frequency distributed unit through a cable, and multiple signals transmitted in the cable are frequency division multiplexed.

22. A radio frequency distributed unit, wherein, it includes N - 1 downlink mixers and N - 1 uplink mixers, N is an integer greater than 1; the N - 1 downlink mixers correspond to N - 1 downlink radio frequency signals among the N downlink radio frequency signals received from the remote radio unit, and the frequencies of the N downlink radio frequency signals are different from each other; each downlink mixer in the N - 1 downlink mixers is configured to mix the received downlink radio frequency signal and the radio frequency local oscillator signal to obtain a downlink service signal, and the frequency of the downlink service signal is equal to the operating frequency of the radio frequency distributed unit; each uplink mixer in the N - 1 uplink mixers is configured to mix the uplink service signal received from the corresponding antenna port and the radio frequency local oscillator signal to obtain an uplink radio frequency signal, wherein the uplink radio frequency signals generated by different uplink mixers are different from each other.

23. The radio frequency distributed unit according to claim 22, wherein, the radio frequency distributed unit further includes N switching units, the N switching units correspond to the N downlink radio frequency signals one by one, and each switching unit in the N switching units is configured to control the radio frequency distributed unit to receive or transmit service signals according to a control signal received from the remote radio unit.

24. The radio frequency distributed unit according to claim 22 or 23, wherein, the radio frequency distributed unit further includes N power amplifiers and N low-noise amplifiers, N - 1 power amplifiers in the N power amplifiers correspond to the N - 1 downlink mixers one by one, and N - 1 low-noise amplifiers in the N low-noise amplifiers correspond to the N - 1 uplink mixers one by one.

25. The radio frequency distributed unit according to any one of claims 22 to 24, wherein, The radio frequency distribution unit further includes N filters, the uplink service signal is the signal selected by the filters, and the frequency of the uplink service signal is equal to the operating frequency of the radio frequency distribution unit.

26. The radio frequency distribution unit according to any one of claims 22 to 25, wherein, the remote radio unit is connected to the radio frequency distribution unit through a cable, and multiple signals transmitted in the cable are frequency division multiplexed.

27. A communication system, wherein, a baseband unit and the radio frequency system according to any one of claims 1 to 8.

28. A communication system, wherein, a baseband unit and the radio frequency system according to any one of claims 9 to 16.

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