WO2024045081A1 - Système radiofréquence - Google Patents

Système radiofréquence Download PDF

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Publication number
WO2024045081A1
WO2024045081A1 PCT/CN2022/116342 CN2022116342W WO2024045081A1 WO 2024045081 A1 WO2024045081 A1 WO 2024045081A1 CN 2022116342 W CN2022116342 W CN 2022116342W WO 2024045081 A1 WO2024045081 A1 WO 2024045081A1
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WO
WIPO (PCT)
Prior art keywords
radio frequency
signal
unit
service
frequency
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PCT/CN2022/116342
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English (en)
Chinese (zh)
Inventor
荆涛
王文涛
王延昭
闵渭阳
姜慧强
陈伟杰
张贞
Original Assignee
华为技术有限公司
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Application filed by 华为技术有限公司 filed Critical 华为技术有限公司
Priority to PCT/CN2022/116342 priority Critical patent/WO2024045081A1/fr
Publication of WO2024045081A1 publication Critical patent/WO2024045081A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station

Definitions

  • the embodiments of the present application relate to the field of line communication technology, and in particular, to a radio frequency system.
  • the current solution for network coverage is to connect multiple radio remote units (RRU) through a baseband unit (BBU) to achieve wide network coverage.
  • RRU radio remote units
  • BBU baseband unit
  • RRU itself has high cost and power consumption, and deploying multiple RRUs requires multiple sets of optical fibers and power supplies, which further leads to higher costs of deploying multiple RRUs. Therefore, a solution with low cost, low power consumption and good performance is urgently needed to improve some shortcomings of the current solution.
  • Embodiments of the present application provide a radio frequency system to reduce network coverage costs and improve network coverage performance.
  • inventions of the present application provide a radio frequency system.
  • the radio frequency system includes a radio frequency remote unit and M radio frequency distribution units, where M is a positive integer.
  • the radio frequency remote unit and the M radio frequency distribution units are The type units are respectively connected;
  • the radio frequency remote unit includes a first multiplexer and an L pair of transceiver links, the L pair of transceiver links are respectively connected to the first multiplexer, and the L is a positive integer; so
  • the radio frequency distribution unit includes a second multiplexer, N radio frequency processing units and N antennas, where N is a positive integer, and each of the N radio frequency processing units includes a first power amplifier.
  • a first low-noise amplifier and a first filter the first power amplifier is connected to the first filter, the first low-noise amplifier is connected to the first filter, the N radio frequency processing units Each of the radio frequency processing units is respectively connected to the N antennas through the included first filter, and the second multiplexer is respectively connected to the N radio frequency processing units.
  • the above-mentioned radio frequency system provided by the embodiment of the present application can achieve wide coverage of the network through the design solution of connecting the radio frequency remote unit to the radio frequency distributed unit. Moreover, this solution deploys components such as power amplifiers, low-noise amplifiers, and filters in radio frequency distributed units closer to users, and the radio frequency distributed units perform power amplification and processing of service signals received from remote radio frequency units or external units.
  • Filtering can bring the following benefits: First, the remote radio unit does not need to perform power amplification, filtering and other operations on the service signal, which can reduce the power consumption of the remote radio unit; second, in the uplink direction, due to the remote radio unit The power of the service signal is not amplified, so the cable between the remote radio unit and the distributed radio unit transmits low-power service signals. Since the service signal is attenuated proportionally when transmitted in the cable, the transmission is small. The attenuation of high-power service signals is less than the attenuation of high-power service signals, so this solution can reduce the attenuation of service signals and improve system performance; thirdly, because one radio frequency remote unit can connect multiple Radio frequency distributed units, thereby achieving wide coverage of the network.
  • the solution of this application can reduce the number of deployments of radio frequency remote units, thereby reducing costs; fourth, due to radio frequency distribution
  • the radio frequency distributed unit is closer to the user, so the power amplification of the service signal in the radio frequency distributed unit can improve the strength and quality of the signal, thus improving the gain and user experience, reducing network coverage costs and improving network coverage performance.
  • the radio frequency remote unit and the M radio frequency distributed units are connected through one cable respectively, and the transmission of signals in the one cable is realized by using frequency division multiplexing technology.
  • the radio frequency remote unit and each radio frequency distributed unit are connected through a cable, which can reduce the number of cables and thereby reduce costs.
  • the signal is one or more of the following: a power signal, a service signal or a control signal.
  • the radio frequency remote unit and the M radio frequency distributed units are connected through N cables respectively, where N is an integer greater than 1.
  • the radio frequency remote unit further includes N-1 first frequency conversion units, the N-1 first frequency conversion units correspond to different frequencies, and the N-1 first frequency conversion units Used to change the frequency of service signals, N is greater than 1;
  • the radio frequency distribution unit also includes N-1 second frequency conversion units, the N-1 second frequency conversion units correspond to different frequencies, and the N-1 The second frequency conversion unit is used to change the frequency of the service signal; the N-1 first frequency conversion units correspond to the N-1 second frequency conversion units one-to-one.
  • the frequency of the service signal is converted by the frequency conversion unit, so that multiple service signals are transmitted at different frequencies in a frequency division multiplexing manner, which can increase the number of service signals sent, thereby improving system performance.
  • the second frequency conversion unit is also configured to receive a first reference signal from the first power amplifier and change the frequency of the first reference signal to obtain a second service reference signal.
  • a reference signal is part or all of the signal obtained by power amplifying the service signal received by the first power amplifier by the first power amplifier; the first frequency conversion unit is also used to receive signals from the second frequency conversion unit the second service reference signal and change the frequency of the second service reference signal to obtain the first service reference signal.
  • the radio frequency remote unit further includes a third frequency conversion unit
  • the radio frequency distributed unit further includes a fourth frequency conversion unit
  • the fourth frequency conversion unit is used to receive signals from the first power amplifier.
  • the first reference signal is obtained by changing the frequency of the first reference signal to obtain a second service reference signal.
  • the first reference signal is obtained by power amplifying the service signal received by the first power amplifier by the first power amplifier. part or all of the signal in the signal;
  • the third frequency conversion unit is configured to receive the second service reference signal from the fourth frequency conversion unit and change the frequency of the second service reference signal to obtain the first service reference Signal.
  • the remote radio frequency unit further includes a first switch unit, and the first switch unit is used to control the remote radio frequency unit to receive or send service signals according to the received control signal.
  • the radio frequency distributed unit further includes a second switch unit, the second switch unit is used to control the radio frequency distributed unit to receive according to the control signal received from the radio remote unit. or send business signals.
  • the remote radio frequency unit further includes K radio frequency processing units and K antennas, and each of the K radio frequency processing units includes a second power amplifier, a second A low noise amplifier and a second filter, the second power amplifier is connected to the second filter, the second low noise amplifier is connected to the second filter, each of the K radio frequency processing units Each of the radio frequency processing units is respectively connected to the K antennas through the included second filter, and K is a positive integer.
  • the radio frequency remote unit includes K radio frequency processing units and K antennas, so that the radio frequency remote unit itself can also realize K transmission and K reception, which helps to expand the signal coverage.
  • embodiments of the present application provide a communication method, which can be executed by a remote radio unit or a module (such as a chip) applied to the remote radio unit. Taking the radio frequency remote unit executing this method as an example, the method is applied to the radio frequency remote unit.
  • the radio frequency remote unit includes a digital processing unit, a frequency conversion unit and a multiplexer; the method includes: the digital processing unit generates a third A service signal and a second service signal, the frequency of the first service signal is the same as the frequency of the second service signal; the frequency conversion unit performs frequency conversion on the second service signal to obtain a third service signal; The multiplexer obtains a fourth service signal according to the first service signal and the third service signal; the multiplexer sends the fourth service signal to the radio frequency distribution unit through a feeder.
  • the multiplexer receives a first control signal, the first control signal is used to control the switching unit of the radio frequency distributed unit, and the switching unit of the radio frequency distributed unit is used to control Open the transmitting channel or receiving channel of the radio frequency distributed unit; the multiplexer sends the first control signal to the radio frequency distributed unit through the feeder, the frequency of the first control signal is consistent with the third The first service signal and the third service signal have different frequencies.
  • the radio frequency remote unit further includes a switch unit; the method further includes: the digital processing unit sending a second control signal to the switch unit; the switch unit of the radio frequency remote unit According to the second control signal, the transmission channel of the radio frequency remote unit is opened.
  • the multiplexer receives a power signal; the multiplexer sends the power signal to the radio frequency distributed unit through the feeder, and the frequency of the power signal is consistent with the first power signal.
  • the frequencies of the service signal and the third service signal are different, and the power signal is used to power the radio frequency distributed unit.
  • the multiplexer receives a reference signal from the radio frequency distributed unit through the feeder, and the reference signal is determined based on the first service signal or the second service signal. ; The multiplexer determines adjustment parameters according to the reference signal, and the adjustment parameters are used to adjust the service signal to be sent by the remote radio frequency unit.
  • the multiplexer receives the fifth service signal from the radio frequency distributed unit through the feeder; the multiplexer obtains the sixth service signal and the A seventh service signal; the multiplexer sends the sixth service signal to the digital processing unit; the multiplexer performs frequency conversion on the seventh service signal to obtain an eighth service signal; the multiplexer The eighth service signal is sent to the digital processing unit; wherein, the frequency of the sixth service signal is the same as the frequency of the eighth service signal.
  • the radio frequency remote unit includes a power amplifier, a filter and an antenna unit; the method further includes: the digital processing unit generates a ninth service signal; the first power amplifier The service signal is amplified to obtain a tenth service signal; the filter filters the tenth service signal to obtain an eleventh service signal; and the antenna unit transmits the eleventh service signal to the outside.
  • embodiments of the present application provide a communication method, which can be executed by a radio frequency distributed unit or a module (such as a chip) applied to the radio frequency distributed unit.
  • the radio frequency distributed unit includes a multiplexer and a first frequency conversion unit; the method includes: the multiplexer receives from The first service signal of the radio frequency remote unit; the multiplexer obtains the second service signal and the third service signal according to the first service signal; the first frequency conversion unit performs frequency conversion on the third service signal, A fourth service signal is obtained; wherein the frequency of the second service signal is the same as the frequency of the fourth service signal.
  • the radio frequency distributed unit further includes a first power amplifier, a first filter and a first antenna unit; the method further includes: the first power amplifier converts the second service signal Amplify to obtain a fifth service signal; the first filter filters the fifth service signal to obtain a sixth service signal; and the first antenna unit transmits the sixth service signal to the outside.
  • the first power amplifier obtains a first reference signal according to the fifth service signal; the first frequency conversion unit performs frequency conversion on the first reference signal to obtain a second reference signal; The multiplexer sends the second reference signal to the radio remote unit through the feeder.
  • the second reference signal is used to determine a first adjustment parameter.
  • the first adjustment parameter is used to adjust the radio frequency.
  • the service signal to be sent by the remote unit is adjusted.
  • the radio frequency distribution unit further includes a second frequency conversion unit; the method further includes: the first power amplifier obtains a third reference signal according to the fifth service signal; the third The second frequency conversion unit performs frequency conversion on the third reference signal to obtain a fourth reference signal; the multiplexer sends the fourth reference signal to the radio frequency remote unit through the feeder, and the fourth reference signal is In order to determine the second adjustment parameter, the second adjustment parameter is used to adjust the service signal to be sent by the remote radio frequency unit.
  • the radio frequency distributed unit further includes a second power amplifier, a second filter and a second antenna unit; the method further includes: the second power amplifier converts the fourth service signal Amplification is performed to obtain a seventh service signal; the second filter filters the seventh service signal to obtain an eighth service signal; and the second antenna unit transmits the eighth service signal to the outside.
  • the multiplexer receives a power signal from the radio frequency remote unit through the feeder, and the frequency of the power signal is consistent with the frequency of the second service signal and the third service signal.
  • the frequencies are all different, and the power signal is used to power the radio frequency distributed unit.
  • the radio frequency distributed unit further includes a switch unit; the method further includes: the multiplexer receives a control signal from the radio frequency remote unit through the feeder, and the control signal The frequency is different from the frequencies of the second service signal and the third service signal.
  • the control signal is used to control the switch unit.
  • the switch unit is used to control opening of the transmission channel of the radio frequency distributed unit. or receive channel.
  • the radio frequency distribution unit further includes a low noise amplifier; the method further includes: the first antenna unit receives a ninth service signal; the first filter The signal is filtered to obtain a tenth service signal; the low noise amplifier amplifies the tenth service signal to obtain an eleventh service signal; the multiplexer sends the third service signal to the radio frequency remote unit through the feeder. Eleven business signals.
  • embodiments of the present application provide a communication device, which may be a remote radio frequency unit or a module (such as a chip) applied in a remote radio frequency unit.
  • the device has the function of implementing any implementation method of the above second aspect. This function can be implemented by hardware, or it can be implemented by hardware executing corresponding software.
  • the hardware or software includes one or more modules corresponding to the above functions.
  • embodiments of the present application provide a communication device, which may be a radio frequency distributed unit or a module (such as a chip) applied in a radio frequency distributed unit.
  • the device has the function of implementing any implementation method of the above third aspect. This function can be implemented by hardware, or it can be implemented by hardware executing corresponding software.
  • the hardware or software includes one or more modules corresponding to the above functions.
  • embodiments of the present application provide a communication device, including a processor and a memory; the memory is used to store computer instructions, and when the device is running, the processor executes the computer instructions stored in the memory to cause the device to execute Any implementation method in the above second to third aspects.
  • embodiments of the present application provide a communication device, including units or means for executing each step of any implementation method in the above second to third aspects.
  • embodiments of the present application provide a communication device, including a processor and an interface circuit.
  • the processor is configured to communicate with other devices through the interface circuit and execute any implementation method in the above second to third aspects.
  • the processor includes one or more.
  • embodiments of the present application provide a communication device, including a processor coupled to a memory.
  • the processor is configured to call a program stored in the memory to execute any implementation method in the above second to third aspects.
  • the memory may be located within the device or external to the device.
  • the processor can be one or more.
  • embodiments of the present application further provide a computer-readable storage medium, in which instructions are stored, and when run on a communication device, the instructions in the above-mentioned second to third aspects are achieved. Any implementation method is executed.
  • embodiments of the present application further provide a computer program product.
  • the computer program product includes a computer program or instructions.
  • the computer program or instructions are run by a communication device, any one of the above-mentioned second to third aspects is enabled.
  • the implementation method is executed.
  • embodiments of the present application further provide a chip system, including: a processor configured to execute any implementation method in the above second to third aspects.
  • Figure 1(a) is a schematic diagram of a communication system provided by an embodiment of the present application.
  • Figure 1(b) is a schematic diagram of another communication system provided by an embodiment of the present application.
  • Figure 1(c) is a schematic diagram of a radio frequency system provided by an embodiment of the present application.
  • Figure 1(d) is a schematic diagram of another radio frequency system provided by an embodiment of the present application.
  • FIG. 2 is a schematic diagram of a radio frequency remote unit provided by an embodiment of the present application.
  • FIG. 3 is a schematic diagram of a radio frequency distributed unit provided by an embodiment of the present application.
  • Figure 4(a) is a schematic diagram of another radio frequency remote unit provided by an embodiment of the present application.
  • Figure 4(b) is a schematic diagram of another radio frequency distributed unit provided by an embodiment of the present application.
  • Figure 5(a) is a schematic diagram of another radio frequency remote unit provided by an embodiment of the present application.
  • Figure 5(b) is a schematic diagram of another radio frequency distributed unit provided by an embodiment of the present application.
  • Figure 6(a) is a schematic diagram of another radio frequency system provided by an embodiment of the present application.
  • Figure 6(b) is a schematic diagram of another radio frequency system provided by an embodiment of the present application.
  • Figure 1(a) is a schematic diagram of a communication system provided by an embodiment of the present application.
  • the communication system includes a baseband unit (BBU) and at least one radio remote unit (RRU).
  • BBU baseband unit
  • RRU radio remote unit
  • the BBU and RRU can be connected through optical fibers.
  • Figure 1(a) takes the communication system including one BBU and three RRUs as an example.
  • the communication system in the embodiment of the present application can also be understood as a distributed base station.
  • BBU is responsible for baseband signal processing.
  • Baseband signals include voice signals, data traffic signals, signaling signals, etc., and are also responsible for encoding, verification, and error correction of various types of data.
  • the BBU In the downlink direction, the BBU is responsible for processing various types of information received from the core network and sending it to the RRU for wireless signal transmission.
  • the BBU In the uplink direction, the BBU is responsible for receiving various types of information from the RRU and processing it accordingly before sending it to the core network.
  • RRU includes functional units such as power amplifier (PA), low noise amplifier (LNA) and filters, and also integrates antennas.
  • the power amplifier is used to amplify the power of the service signal to be sent, 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.
  • Filters are used to filter signals. In the downlink direction, the RRU receives the signal from the BBU, and then the power amplifier amplifies the signal, and the filter filters the service signal, and then transmits the signal through the antenna.
  • the RRU receives signals through the antenna, and then the RRU's low-noise amplifier 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.
  • an embodiment of the present application provides a communication system.
  • the communication system includes a BBU and a radio frequency system.
  • the radio frequency system includes an RRU and a radio frequency distributed unit (radio distributed unit, RDU). There may be one or more RRUs, and there may be one or more RDUs.
  • RDU radio frequency distributed unit
  • One BBU connects the one or more RRUs through optical fibers.
  • Figure 1(b) takes the radio frequency system including two RRUs and six RDUs as an example, in which each RRU is connected to three RDUs.
  • An RRU is connected to one or more RDUs through cables (such as feeders).
  • the embodiment of the present application does not limit the names of the units included in the communication system.
  • the BBU, RRU, and RDU may have other names.
  • RDU may also be called a radio frequency unit, radio frequency front-end, radio frequency front-end unit or other names, which is not limited in this application.
  • RRU can also be called radio frequency backend, radio frequency backend unit or other names, which is not limited in this application.
  • RDU RDU
  • functional units of the RRU in Figure 1(a) are moved to the RDU for deployment.
  • These functional units include but are not limited to: filters, power amplifiers, low noise amplifiers, and antennas.
  • Add functional units to RDU such as multiplexers.
  • the multiplexer is used to combine one or more of multiple signals to be sent, such as reference signals or service signals, and send the combined signal to the RRU, and is used to receive the combined signal from the RRU, and Parse the combined signal into multiple independent signals.
  • the multiplexer can be used to combine multiple signals to be sent and send the combined signal to the RDU, and can also be used to receive a signal from the RDU and parse the signal into multiple independent signals.
  • the signal may be a control signal, a service signal, or a power signal.
  • the above communication system connects one or more RDUs to the RRU, and the remote RDU achieves wide network coverage, thus reducing the deployment of RRUs. Since the cost of deploying RDUs is much lower than the cost of deploying RRUs, reducing the number of RRUs reduces network coverage costs. In addition, since the RDU is deployed remotely from the location of the RRU, the coverage of the architecture shown in Figure 1(a) can be increased, thereby further improving the network coverage while reducing network coverage costs.
  • any communication system involved in this application can be applied to the fourth generation (4th generation, 4G) mobile communication network, the fifth generation (5th generation, 5G) mobile communication network or future communication networks, such as This application is not limited to sixth generation mobile communication networks, open access network communication networks, etc.
  • FIG. 1(c) is a schematic diagram of a radio frequency system provided by an embodiment of the present application.
  • the radio frequency system includes an RRU and M RDUs.
  • the RRU is connected to the M RDUs respectively, and M is a positive integer. That is, one RRU can be connected to one or more RDUs.
  • one RRU is connected to two RDUs as an example.
  • the RRU in the embodiment of this application can also be connected to the BBU.
  • This BBU can connect to one or more RRUs. Therefore, in the solution of the embodiment of this application, one BBU can be connected to one or more RRUs, and one RRU can be connected to one or more RDUs.
  • the RRU includes a multiplexer and L pairs of transceiver links.
  • the L pairs of transceiver links are respectively connected to the multiplexer.
  • L is a positive integer.
  • the RRU includes two pairs of transceiver links as an example.
  • Each pair of transceiver links includes a transmitting link and a receiving link.
  • the transmitting link is used to send service signals to the outside world, and the receiving link is used to receive service signals.
  • a multiplexer is used to combine one or more of multiple signals, such as service signals, control signals, power signals, etc., and the frequencies of the multiple signals are different.
  • the service signal in the embodiment of this application is also called a data signal, a service data signal, etc., which will be described uniformly here and will not be described in detail later.
  • the RDU includes a multiplexer, N radio frequency processing units, and N antennas.
  • the N radio frequency processing units correspond to the N antennas one-to-one.
  • Each of the N radio frequency processing units includes a power amplifier, a low noise amplifier and a filter.
  • the power amplifier is connected to the filter, the low noise amplifier is connected to the filter, and each filter is connected to one of the N antennas.
  • An antenna is connected, and the multiplexer is connected to N radio frequency processing units respectively.
  • the RDU includes a multiplexer, two radio frequency processing units and two antennas as an example.
  • the multiplexer in the RDU is used to receive signals from the RRU, which are combined from multiple signals with different frequencies.
  • a multiplexer splits the received signal into multiple signals of different frequencies. If the multiple signals include multiple service signals, the multiple service signals are sent over the air interface through different channels, that is, the multiple service signals are sent over the air interface through different radio frequency processing units and antennas.
  • the multiplexer in the RRU may be called a first multiplexer, and the multiplexer in the RDU may be called a second multiplexer.
  • the relationship between the number L of transceiver links in the RRU and the number N of radio frequency processing units in the RDU can be implemented in the following two ways.
  • the L pair of transceiver links is used to receive signals from M RDUs and send signals to M RDUs. That is, the implementation method is that N pairs of transceiver links of an RRU are connected to M RDUs at the same time, and each RDU among the M RDUs has N pairs of transceiver links. That is, the N pairs of transceiver links of the RRU correspond to the N pairs of transceiver links of the first RDU, the N pairs of transceiver links of the RRU correspond to the N pairs of transceiver links of the second RDU, and so on.
  • FIG. 1(c) is an example of implementation method 1.
  • the two pairs of transceiver links in the RRU correspond to the two pairs of transceiver links in the first RDU, and the two pairs of transceiver links in the RRU correspond to the two pairs of transceiver links in the second RDU. correspond.
  • the M groups of transceiver links are in one-to-one correspondence with the M RDUs, or in other words, the L pairs of transceiver links are in one-to-one correspondence with the M*N pairs of M*N transceiver links of the M RDUs.
  • the first group of transceiver links in the M group of transceiver links corresponds to the first RDU
  • the second group of transceiver links in the M group of transceiver links corresponds to the second RDU
  • the M group of transceiver links corresponds to the second RDU
  • the Mth group of transceiver links in the transceiver link corresponds to the Mth RDU.
  • the first set of transceiver links in the RRU is used to receive signals from the first RDU and/or send signals to the first RDU
  • the second set of transceiver links in the RRU is used to receive signals from the second RDU and/or send signals to the first RDU.
  • each RDU includes two pairs of transceiver links.
  • the two pairs of transceiver links in the first group of transceiver links of the RRU correspond to the two pairs of transceiver links in the first RDU.
  • the two pairs of transceiver links in the second group of transceiver links of the RRU correspond to the two pairs of transceiver links in the first RDU.
  • the two pairs of transceiver links in the two RDUs correspond one to one.
  • the above-mentioned radio frequency system provided by the embodiment of the present application can achieve wide coverage of the network through the design solution of connecting RRUs to RDUs. Moreover, this solution deploys components such as power amplifiers, low-noise amplifiers and filters in the RDU closer to the user.
  • the RDU power amplifies and filters the service signals received from the RRU or externally, which can bring the following benefits: First, the RRU eliminates power amplification and filtering of service signals, which can reduce the power consumption of the RRU; second, in the upstream direction, the cable between the RRU and the RDU transmits low-power service signals. Business signals are attenuated proportionally when transmitted in cables.
  • the attenuation of low-power business signals is smaller than the attenuation of high-power business signals. Therefore, this solution can reduce the attenuation of business signals and improve system performance.
  • one RRU is connected to each RDU through a cable, which can be an optical fiber or a feeder.
  • the transmission of signals in this cable is achieved by using frequency division multiplexing technology, that is, frequency division multiplexing between different types of signals transmitted on a cable.
  • the signals here are one or more of the following : Power signal, service signal or control signal. This solution can reduce costs due to the small number of cables.
  • one RRU is connected to each RDU through T cables.
  • the cables can be optical fibers or feeders, and T is an integer greater than 1.
  • Signal The value of T can also be other values, which is not limited by this application.
  • FIG. 2 is a schematic diagram of another RRU provided by an embodiment of the present application.
  • the RRU shown in Figure 2 is to add one or more of the following devices to the RRU shown in Figure 1(c):
  • Digital processing unit It can generate business signals and control signals, and send business signals and control signals to the multiplexer through the transmitting link.
  • the business signals include business data, and the control signals are used to control the opening and closing direction of the switch.
  • the combined direction includes the receiving direction and the sending direction of the service signal.
  • the service signal can also be received from the multiplexer and the service signal can be processed.
  • switch used to open the transmitting channel for sending business signals or open the receiving channel for receiving business signals according to the received control signal, that is, the transmitting channel and the receiving channel share the same channel, and the time can be divided by the switch Share the channel.
  • the control signal is represented by "0", which means opening the transmission channel for sending service signals
  • the control signal is represented by "1”, which means opening the transmission channel for receiving service signals.
  • the switch is used to switch transceiver channels for service data in different time slots.
  • the frequency conversion unit is used to change the frequency of the service signal.
  • P N-1, that is, there are N-1 frequency conversion units in the RRU.
  • the N-1 frequency conversion units correspond to M RDUs.
  • the N-1 frequency conversion units are used to provide M RDUs.
  • Frequency conversion service that is, the M RDUs are provided with frequency conversion services by N-1 frequency conversion units of the same RDU.
  • the N-1 frequency conversion units perform frequency conversion on service signals sent to each RDU, and frequency conversion on service signals received from each RDU.
  • P M*(N-1), that is, there are M groups of frequency conversion units in the RRU.
  • Each group of frequency conversion units includes N-1 frequency conversion units.
  • the M groups of frequency conversion units are the same as M RDUs.
  • the first group of frequency conversion units in M groups of frequency conversion units corresponds to the first RDU
  • the second group of frequency conversion units in M groups of frequency conversion units corresponds to the second RDU
  • the Mth group of frequency conversion units in M groups of frequency conversion units corresponds to the first RDU.
  • the group frequency conversion unit corresponds to the Mth RDU.
  • the first group of frequency conversion units performs frequency conversion on service signals sent to the first RDU, and frequency conversion on service signals received from the first RDU.
  • the second group of frequency conversion units performs frequency conversion on service signals sent to the second RDU, and frequency conversion on service signals received from the second RDU.
  • the Mth group of frequency conversion units performs frequency conversion on the service signals sent to the Mth RDU, and frequency conversion on the service signals received from the Mth RDU.
  • the RRU includes 2 pairs of transceiver links and 1 frequency conversion unit, which corresponds to transceiver link 2 of the RRU.
  • the digital processing unit generates service signal 1 and service signal 2.
  • the frequency of the service signal 1 is F1.
  • the service signal 1 is sent to the switch through the transmitting link in the transceiver link 1, and then sent to the multiplexer through the switch.
  • the service signal The frequency of 2 is also F1.
  • the service signal 2 is sent to the frequency conversion unit through the transmitting link of the transceiver link 2.
  • the frequency conversion unit converts the frequency of the service signal 2 to F2, thereby obtaining the frequency-converted service signal 2', and then the frequency conversion unit
  • the traffic signal 2' is sent to the switch and through the switch to the multiplexer.
  • the multiplexer receives service signal 1 and service signal 2'. Since the frequencies of the two service signals are different, the multiplexer combines the two service signals according to frequency division multiplexing to obtain a combined service signal and The combined service signal is sent to one or more RDUs among the M RDUs through the cable, and the one or more RDUs receive the same combined service signal.
  • This method can realize frequency division multiplexing of signals and can reduce the number of required cables, thereby reducing costs.
  • Control unit used to generate a control signal.
  • the control signal can be sent to the control unit in the RDU through the multiplexer.
  • the control signal is used to control the opening and closing of the switch in the RDU to open the switch in the RDU.
  • This power supply can supply power to the RRU. At the same time, it can also send power signals to the power supply in the RDU through the multiplexer to supply power to the RDU.
  • the RRU can also include:
  • Each radio frequency processing unit includes a power amplifier, a low noise amplifier and a filter.
  • the power amplifier is connected to the filter, and the low noise amplifier is connected to the filter.
  • K is a positive integer.
  • the power amplifier is used to amplify the power of the service signal to be sent, 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 data.
  • K antennas Each antenna is connected to a filter.
  • the RRU when the RRU contains K radio frequency processing units and K antennas, the RRU can also realize the sending and receiving of service signals, that is, the RRU also has the function of an RDU and can realize K sending and receiving of service signals.
  • multiple generated service signals can be combined, and then the combined signals are sent to the RDU and sent by the RDU over the air interface through the antenna, and the signals from the RDU are processed.
  • the RRU may also have the function of transmitting and receiving signals through an antenna.
  • L pairs of transceiver links are deployed in the RRU.
  • the RRU can multiplex the K pairs of transceiver links among the L pairs of transceiver links, so that the RRU itself also has the function of transmitting and receiving signals through the antenna.
  • the L pair of transceiver links are used to communicate with M RDUs.
  • the K pairs of transceiver links in the L pair The transceiver links are also used to connect the K radio frequency processing units in the RRU.
  • the K transceiver links correspond to the K radio frequency processing units, and the K radio frequency processing units correspond to the K antennas.
  • L+K pairs of transceiver links can be deployed in the RRU.
  • L pairs of transceiver links are used to communicate with M RDUs.
  • K pairs of transceiver links are used to connect to K radio frequency processing units in the RRU.
  • the K transceiver links are connected to the K radio frequency processing units are in one-to-one correspondence, and K radio frequency processing units are in one-to-one correspondence with K antennas.
  • FIG. 3 is a schematic diagram of an RDU provided by an embodiment of the present application.
  • the RDU shown in Figure 3 is to add one or more of the following devices to the RDU shown in Figure 1(c):
  • the switch Since the transmitting channel and the receiving channel share a channel, the switch is used to control the channel to transmit signals as a transmitting channel, or the switch is used to control the channel to receive signals as a receiving channel. Specifically, the switch can receive a control signal from the control unit of the RDU, and control whether the shared channel is used as a transmitting channel or a receiving channel according to the control signal. The switch is used to switch the transceiver channel in a time-sharing manner.
  • the RRU may include two switches.
  • One switch may be provided between the multiplexer and the power amplifier, or between the multiplexer and the low-noise amplifier.
  • the multiplexer that controls the RRU sends a signal to the power amplifier or the multiplexer receives a signal from the low-noise amplifier.
  • Another switch is set between the filter and the power amplifier, or between the filter and the low-noise amplifier. Use Used to control the antenna to receive signals or send signals.
  • the combination of these two switches can control the opening of the transmitting channel or receiving channel in a time division multiplexing manner.
  • the setting method of the switch in the RDU is exemplarily explained. The actual application is not limited to this setting method. Any other way of setting the switch, as long as it can control the use of the shared channel in a time division multiplexing manner, all belong to the present invention. scope of protection.
  • the switch in the RRU can be called the first switch, and the switch in the RDU can be called the second switch.
  • N-1 frequency conversion units correspond to N-1 different transceiver links.
  • the N-1 frequency conversion units correspond to different frequencies. Each frequency conversion unit is used to change the service signal. frequency, the N is greater than 1.
  • the frequency conversion unit in the RRU may be called the first frequency conversion unit, and the frequency conversion unit in the RDU may be called the second frequency conversion unit.
  • the N-1 frequency conversion units in the RDU have a one-to-one correspondence with the N-1 frequency conversion units in the RRU.
  • Control unit used to receive control signals from the RRU and control the switches in the RDU based on the control signals to open the transmission channel in the RDU for sending service signals or open the channel for receiving service signals.
  • the receiving channel that is, the transmitting channel and the receiving channel in the RDU share the same channel, and the channel can be shared in time through the switch.
  • the power supply receives the power signal from the RRU to supply power to the RDU, thus improving the performance of the RDU.
  • the above-mentioned RRU in Figure 2 and the RDU in Figure 3 can form a radio frequency system.
  • the RRU can provide power signals, control signals and service signals to the RDU. If the power signal, control signal and business signal are transmitted through a cable, the power signal, control signal and business signal can be frequency division multiplexed, that is, the power signal, control signal and business signal have different frequency, thereby transmitting multiple different types of signals in one cable.
  • the radio frequency system includes the RRU shown in Figure 2 and the RDU shown in Figure 3, the specific implementation of the devices included in the RRU and RDU is introduced below.
  • the RRU and RDU in the radio frequency system can also be implemented in other ways, and this is only an example.
  • the radio frequency system includes one RRU and M RDUs.
  • the RRU includes a multiplexer and L pairs of transceiver links, as well as a power supply, digital processing unit, switch and P frequency conversion units and control units.
  • Each RDU It contains a multiplexer and N radio frequency processing units, as well as power supplies, switches, N-1 frequency conversion units, and control units.
  • the power supply in the RRU is used to power the RRU and RDU.
  • the digital processing unit of the RRU is used to process signals to be sent and received signals.
  • the control unit of the RRU is used to control the opening and closing of the switches in the RDU.
  • the frequency conversion unit of the RRU is used to convert the frequency of the service signal to be sent or the received service signal.
  • the power supply in the RDU is used to receive the power signal from the RDU and provide power to the RDU based on the power signal.
  • the control unit of the RDU is used to control the opening and closing of the switch in the RDU based on the control signal from the RRU.
  • the frequency conversion unit of the RDU is used to convert the frequency of the service signal to be sent or the received service signal.
  • Implementation method 2 Based on the above implementation method 1, the RRU further includes K radio frequency processing units and K antennas.
  • the radio frequency system in this implementation method has a new agent radio frequency processing unit and antenna in the RRU. Therefore, the RRU itself also has the function of transmitting and receiving signals through the antenna, thus expanding the The signal transmission and reception range of the radio frequency system and the signal transmission and reception capabilities are improved.
  • Figure 4(a) is a schematic diagram of another RRU provided by an embodiment of the present application.
  • the RRU of Figure 4(a) adds the function of receiving and parsing reference signals based on the aforementioned RRU of Figure 2. Specifically, it adds It provides the feedback link of the reference signal and the function of the digital processing unit to analyze the received reference signal.
  • Figure 4(b) is a schematic diagram of another RDU provided by the embodiment of the present application.
  • the RDU of Figure 4(b) adds the function of generating and sending reference signals based on the aforementioned RRU of Figure 3. Specifically, it adds The power amplifier generates and sends a reference signal.
  • the RRU in Figure 4(a) and the RDU in Figure 4(b) form a radio frequency system, and the radio frequency system can implement loopback of the reference signal.
  • the power amplifier in the RDU in Figure 4(b) amplifies the received service signal, and then uses part or all of the amplified service signal as a reference signal and sends it to the multiplexer of the RDU.
  • the frequency conversion unit a converts the frequency of the reference signal and sends it to the multiplexer, and then the multiplexer of the RDU sends the received reference signal to Figure 4(a) RRU
  • the frequency conversion unit a is one of the N-1 frequency conversion units used to convert service signals in the RDU described in Figure 3, that is, this solution multiplexes one of the N-1 frequency conversion units.
  • the frequency conversion unit a performs frequency conversion on the reference signal.
  • the multiplexer of the RRU receives the reference signal and sends the reference signal to the digital processing unit through a feedback link.
  • the feedback link refers to a link dedicated to transmitting service signals.
  • the RRU will send the received reference signal to the corresponding frequency conversion unit (hereinafter referred to as frequency conversion unit b).
  • the frequency conversion unit b After the frequency conversion unit b performs frequency conversion on the reference signal, the converted frequency The reference signal is sent to the digital processing unit through the feedback link.
  • the frequency conversion unit b is one of the N-1 frequency conversion units used to convert the service signal in the RRU described in Figure 2. That is, the solution is complex.
  • the frequency conversion unit b among the N-1 frequency conversion units is used to perform frequency conversion on the reference signal. Among them, the frequency conversion unit b has a corresponding relationship with the frequency conversion unit a.
  • the frequency conversion unit a is used to change the frequency of the reference signal from F1 to F2
  • the frequency conversion unit b is used to change the frequency of the reference signal from F2 to F1.
  • the digital processing unit analyzes the received reference signal and adjusts the power of the service signal subsequently sent by the RRU based on the analysis results. For example, if the analysis results show that the power of the service signal amplified by the RDU's power amplifier is less than the preset first threshold, the RRU will increase the power of the service signal when subsequently sending the service signal to the RDU, thereby improving signal quality and strength.
  • the RRU can reduce the power of the service signal when subsequently sending the service signal to the RDU, thereby saving power consumption.
  • the second threshold is greater than or equal to the first threshold.
  • the RDU does not have an independent feedback channel when feeding back the reference signal to the RRU.
  • the reference signal is sent by multiplexing the transceiver channel of the service signal. Specifically, the service signal and the reference signal are sent by time division multiplexing.
  • This radio frequency system is suitable for time division duplexing (TDD) standards and scenarios where the number of RDU channels is small. It can implement loopback transmission of reference signals in the time slots between TDD downlink and uplink switching, or in a downlink symbol. The downlink signal is not sent upstream and the loopback transmission of the service signal is implemented on the downlink symbol. This solution can realize downlink gain power control, digital predistortion and nonlinear correction.
  • Figure 5(a) is a schematic diagram of another RRU provided by an embodiment of the present application.
  • the RRU of Figure 5(a) adds the function of receiving and parsing reference signals based on the aforementioned RRU of Figure 2. Specifically, it adds It provides the feedback link of the reference signal and the function of the digital processing unit to analyze the received reference signal.
  • Figure 5(b) is a schematic diagram of another RDU provided by the embodiment of the present application.
  • the RDU of Figure 5(b) adds the function of generating and sending reference signals based on the aforementioned RRU of Figure 3. Specifically, it adds The power amplifier generates and sends a reference signal.
  • the RRU in Figure 5(a) and the RDU in Figure 5(b) form a radio frequency system that can implement loopback of the reference signal.
  • the main difference between the radio frequency system composed of the RRU of Figure 5(a) and the RDU of Figure 5(b) and the above-mentioned radio frequency system composed of the RRU of Figure 4(a) and the RDU of Figure 4(b) is that:
  • Figure 5 In the radio frequency system composed of the RRU in (a) and the RDU in Figure 5(b), the RDU has an independent feedback channel when feeding back the reference signal to the RRU.
  • This reference signal does not need to be like the RRU in Figure 4(a) and the RDU in Figure 4(b).
  • the radio frequency system composed of RDU in (b) needs to reuse the transceiver channel of the service signal, but sends the reference signal to the RRU through a separate feedback channel.
  • the radio frequency system composed of the RRU in Figure 5(a) and the RDU in Figure 5(b) is suitable for the frequency division duplexing (FDD) standard.
  • FDD frequency division duplexing
  • the feedback channels can be individually transformed Frequency, the reference signal is sent to the RRU in a frequency division multiplexing manner. This solution can realize downlink gain power control, digital predistortion and nonlinear correction.
  • the power amplifier in the RDU in Figure 5(b) performs power amplification on the received service signal, and then uses part or all of the amplified service signal as a reference signal, and the power amplifier sends the reference signal to
  • This frequency conversion unit 1 is dedicated to frequency conversion of the loopback reference signal.
  • This frequency conversion unit 1 is connected with the frequency conversion unit (hereinafter referred to as the frequency conversion unit 1) in the RDU for frequency conversion of the service signal. That is, the N-1 frequency conversion units in Figure 3) are different frequency conversion units.
  • the frequency conversion unit 1 sends the frequency-converted reference signal to the multiplexer, and then the RDU multiplexer sends the received reference signal to Figure 5(a ) of the RRU.
  • the multiplexer of the RRU receives the reference signal and sends the received reference signal to the corresponding frequency conversion unit (hereinafter referred to as the frequency conversion unit 2).
  • the frequency conversion unit 2 is dedicated to frequency conversion of the reference signal.
  • the frequency conversion unit 2 is connected to the RRU.
  • the frequency conversion units used for frequency conversion of service signals i.e., N-1 frequency conversion units in Figure 2 are different frequency conversion units. After the frequency conversion unit 2 converts the frequency of the reference signal, the frequency conversion unit 2 passes the frequency-converted reference signal through the feedback chain. path is sent to the digital processing unit.
  • the frequency conversion unit 2 There is a corresponding relationship between the frequency conversion unit 2 and the frequency conversion unit 1. Specifically, if the frequency conversion unit 1 is used to change the frequency of the reference signal from F1 to F2, then the frequency conversion unit 2 is used to change the frequency of the reference signal. The frequency changes from F2 to F1.
  • the digital processing unit analyzes the received reference signal and adjusts the power of the service signal subsequently sent by the RRU based on the analysis results. For example, if the analysis results show that the power of the service signal amplified by the RDU's power amplifier is less than the preset first threshold, the RRU will increase the power of the service signal when subsequently sending the service signal to the RDU, thereby improving signal quality and strength.
  • the RRU can reduce the power of the service signal when subsequently sending the service signal to the RDU, thereby saving power consumption.
  • the second threshold is greater than or equal to the first threshold.
  • the frequency conversion unit 1 and the frequency conversion unit 2 used for frequency conversion of the reference signal may also be called a dedicated frequency conversion unit or a reference signal frequency conversion unit, and the frequency conversion unit used for frequency conversion of the service signal may be called a conventional frequency conversion unit. Or business signal frequency conversion unit.
  • the various radio frequency systems introduced in the above embodiments of this application can realize the functions of X transmitting and Y receiving, where X and Y are both integers greater than or equal to 1.
  • the radio frequency system in the embodiment of the present application transfers part or all of the transceiver channels of the RRU to the RDU to realize the function of X transmission and Y reception, where X may or may not equal Y.
  • two specific radio frequency systems are introduced below. Both radio frequency systems can implement 8T (Transmit) and 8R (Receive), where T represents transmission and R represents reception.
  • FIG. 6(a) is a schematic diagram of a radio frequency system provided by an embodiment of the present application.
  • the radio frequency system includes a BBU, an RRU and two RDUs.
  • the RRU is connected to each RDU through a feeder.
  • the RRUs in this radio frequency system have 4T4R capabilities, and each RDU has 2T2R capabilities.
  • the radio frequency system implements 8T8R through one RRU and two RDUs.
  • the RRU includes K radio frequency processing units and K antennas
  • FIG. 6(b) is a schematic diagram of another radio frequency system provided by an embodiment of the present application.
  • the radio frequency system includes a BBU, an RRU and three RDUs.
  • the RRU is connected to each RDU through a feeder.
  • the RRUs in the radio frequency system have 2T2R capabilities, and each RDU has 2T2R capabilities.
  • the radio frequency system implements 8T8R through one RRU and three RDUs.
  • the RRU and RDU include corresponding hardware structures and/or software modules that perform each function.
  • the units and method steps of each example described in conjunction with the embodiments disclosed in this application can be implemented in the form of hardware or a combination of hardware and computer software. Whether a certain function is executed by hardware or computer software driving the hardware depends on the specific application scenarios and design constraints of the technical solution.
  • the method steps in the embodiments of the present application can be implemented by hardware or by a processor executing software instructions.
  • 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 In memory, register, hard disk, mobile hard disk, CD-ROM or any other form of storage medium well known in the art.
  • An exemplary storage medium is coupled to the processor such that the processor can read information from the storage medium and write information to the storage medium.
  • the storage medium can also be an integral part of the processor.
  • the processor and storage media may be located in an ASIC. Additionally, the ASIC can be located in the base station or terminal. Of course, the processor and the storage medium may also exist as discrete components in the base station or terminal.
  • the computer program product includes one or more computer programs or instructions.
  • the computer may be a general-purpose computer, a special-purpose computer, a computer network, a base station, a user equipment, or other programmable device.
  • the computer program or instructions may be stored in a computer-readable storage medium or transmitted from one computer-readable storage medium to another.
  • the computer program or instructions may be transmitted from a website, computer, A server or data center transmits via wired or wireless means to another website site, computer, server, or data center.
  • 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 data center that integrates one or more available media.
  • the available media may be magnetic media, such as floppy disks, hard disks, and tapes; optical media, such as digital video optical disks; or semiconductor media, such as solid-state hard drives.
  • the computer-readable storage medium may be volatile or nonvolatile storage media, or may include both volatile and nonvolatile types of storage media.
  • “at least one” refers to one or more, and “plurality” refers to two or more.
  • “And/or” describes the association of associated objects, indicating that there can be three relationships, for example, A and/or B, which can mean: A exists alone, A and B exist simultaneously, and B exists alone, where A, B can be singular or plural.
  • the character “/” generally indicates that the related objects before and after are an “or” relationship; in the formula of this application, the character “/” indicates that the related objects before and after are a kind of "division” Relationship.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Transceivers (AREA)

Abstract

Des modes de réalisation de la présente demande concernent un système radiofréquence. Une solution de conception de connexion d'une unité radio distante à des unités distribuées radiofréquence peut mettre en œuvre une large couverture d'un réseau. Selon la solution, des dispositifs tels qu'un amplificateur de puissance, un amplificateur à faible bruit et un filtre sont déployés dans des unités distribuées radiofréquence plus proches d'un utilisateur, et les unités distribuées radiofréquence effectuent une amplification de puissance et un filtrage sur un signal de service reçu de l'unité radio distante ou de l'extérieur, de telle sorte que la consommation d'énergie de l'unité radio distante peut être réduite, les performances du système sont améliorées, le coût de déploiement du réseau est réduit, et l'expérience utilisateur est améliorée.
PCT/CN2022/116342 2022-08-31 2022-08-31 Système radiofréquence WO2024045081A1 (fr)

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US20210409052A1 (en) * 2020-06-30 2021-12-30 Murata Manufacturing Co., Ltd. Radio-frequency module and communication device
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