Signal processing device, multimode extended radio frequency card, and radio frequency signal remote unit

Abstract

The present disclosure relates to a signal processing device, a multimode extended radio frequency card, and a radio frequency signal remote unit. In the signal processing device, a signal combining and splitting unit carries out combination processing on multiple radio frequency signals from different operators of a baseband processing unit and a multimode extended radio frequency card so as to obtain a first radio frequency signal; a first signal conversion unit converts the first radio frequency signal into a first analog optical signal, sends the first analog optical signal to the radio frequency signal remote unit, and then communicates with a user terminal. According to the present disclosure, compared with the prior art, the signal combining and splitting unit does not use a digital signal to carry out combination and splitting when carrying out combination and splitting processing, but uses a radio frequency signal (an analog signal) to carry out combination and splitting, and the delay of the processing process of combination and splitting of the analog signal is smaller than the delay of the processing process of combination and splitting of the digital signal, so that the delay can be greatly reduced.

Description

Signal processing equipment, multi-mode expansion radio frequency cards and radio frequency signal extension equipment Technical Field

[0001] The present disclosure relates to the field of communication technology, and in particular to a signal processing device, a multi-mode expansion radio frequency card, and a radio frequency signal extension device. Background Art

[0002] Nowadays, users will choose different operators for communication according to their own needs. For different first operators and second operators, if the first operator has a base station (i.e., the first operator base station) deployed in a certain user gathering area, and the second operator has no base station deployed in the user gathering area, considering the high cost of deploying a complete base station, in order to save costs, the second operator can set up an indoor communication system in the user area and add a multimode extended radio card (MERC) to the first operator base station, use the indoor communication system to communicate with the added MERC, and then use the first operator base station to improve the communication quality of its own users in the user gathering area.

[0003] Currently, the indoor communication system and the added MERC communicate by sending and receiving radio frequency signals. In the first operator's base station, the second operator's signal is converted from an radio frequency signal (analog signal) to a digital signal, and then combined with the first operator's digital signal to obtain a combined signal. By combining the signals, the communication quality of users of each operator in the user gathering area is improved.

[0004] However, for digital signals, the delay during digital signal combining and splitting processing and digital exchange is relatively high. Moreover, the digital signals of various operators are currently combined in the combining and splitting unit of the first operator's base station in the form of framing. The subframes from different operators are arranged in sequence to obtain a combined signal for transmission. Each operator can only use part of the time resources, which further increases the delay.

[0005] Summary of the Invention

[0006] The embodiments of the present disclosure provide a signal processing device, a multi-mode expansion radio frequency card, and a radio frequency signal remote device, which can solve the problems in related technologies. The technical solutions are as follows:

[0007] In a first aspect, an embodiment of the present disclosure provides a signal processing device, comprising a signal combining and splitting unit and a first signal conversion unit. The signal combining and splitting unit is configured to combine and process multiple RF signals of different frequency bands to obtain a first RF signal, wherein the multiple RF signals of different frequency bands are respectively provided by a baseband processing unit and a multi-mode expansion RF card. The first signal conversion unit is connected to the signal combining and splitting unit and is configured to convert the first RF signal into a first analog optical signal and transmit the first analog optical signal to a RF signal remote device.

[0008] Signal processing equipment can be a standalone device or integrated into other devices, such as a radio hub (RHUB). It can be located in a computer room in a user-concentrated area or in a weak current cabinet in a building within a user-concentrated area.

[0009] In one possible implementation, the signal combining and splitting unit may be a radio frequency combiner and splitter. The signal combining and splitting unit has two or more input ports and one output port, the output port being connected to the first signal conversion unit via a feeder, and each input port being connected to the baseband processing unit and the multi-mode expansion radio frequency card, respectively. The radio frequency signal received by the signal combining and splitting unit from the baseband processing unit is a signal of the first operator (primary operator), and the signal received from the multi-mode expansion radio frequency card is a signal of the second operator (secondary operator).

[0010] In the process of the signal combining and splitting unit sending a signal to the first signal conversion unit, the function of the signal combining and splitting unit is to combine the input multi-band RF signals together, that is, perform combining processing, obtain a combined signal, and send the obtained combined signal to the first signal conversion unit.

[0011] Radio frequency signals of different frequency bands may be different types of radio frequency signals, such as GSM (Global System for Mobile Communications) signals with a frequency range of 885MHz-960MHz (megahertz), 3G signals with a frequency range of 1920MHz-2170MHz, or WLAN (Wireless Local Area Networks) signals with a frequency range of 2400MHz-2500MHz. Radio frequency signals of different frequency bands may also be radio frequency signals of the same type with different frequency intervals, such as radio frequency signals with a frequency range of 885MHz-900MHz and radio frequency signals with a frequency range of 900MHz-920MHz in GSM signals.

[0012] RF signals of different frequency bands enter the RF combiner through corresponding input ports, are combined within the RF combiner, and generate a first RF signal. The first RF signal is then transmitted to the first signal conversion unit through the output port. The first RF signal can be a mixed signal of the RF signals of the aforementioned different frequency bands. The signal combining and splitting unit combines multiple RF signals of different frequency bands using frequency division multiplexing.

[0013] In this way, compared with directly using digital signals for combining processing, the delay of the processing process of using RF signals for combining is less than the delay of the processing process of using digital signals for combining. In addition, since the RF signals of each operator can generally use frequency division multiplexing when combining and processing in the signal combining and splitting unit, the RF signals of multiple frequency bands do not need to be framed and can be transmitted using channels at the same time, that is, each operator can use all time resources. At the same time, under normal circumstances, since the frequency bands used by different operators are separated from each other and there is no overlap, when using the signal processing equipment to transmit signals of multiple operators at the same time, the time resources enjoyed by each operator among the multiple operators are no different from the time resources enjoyed when transmitting the signals of one operator alone, thereby reducing the delay.

[0014] In a possible implementation, the first signal conversion unit may be connected to the signal combining and splitting unit via a feeder line, and the feeder line may be a twisted pair line or the like.

[0015] The first signal conversion unit may be an electro-optical converter having an input port and an output port, wherein the input port of the first signal conversion unit is connected to the output port of the signal combining and splitting unit via a feeder line, and the output port of the first signal conversion unit is connected to the radio frequency signal remote device via an optical fiber.

[0016] In implementation, the function of the first signal conversion unit is to receive the first RF signal sent from the signal combining and splitting unit, modulate the first RF signal to obtain a first analog optical signal, and transmit the modulated first analog optical signal to the RF signal remote device.

[0017] In this way, using optical fiber to connect the signal processing equipment and the radio frequency signal extension equipment can increase the arrangement distance between the signal processing equipment and the radio frequency signal extension equipment.

[0018] In one possible implementation, the signal processing device further includes a second signal conversion unit. The second signal conversion unit is connected to the signal combining / splitting unit and the multi-mode expansion radio frequency card, respectively, and is configured to receive a second analog optical signal transmitted by the multi-mode expansion radio frequency card, convert the second analog optical signal into a second radio frequency signal, and transmit the second radio frequency signal to the signal combining / splitting unit.

[0019] The second signal conversion unit can be connected to the signal combining and splitting unit through a feeder line, and connected to the multi-mode expansion radio frequency card through an optical fiber. The feeder line can be a twisted pair line, etc.

[0020] The second signal conversion unit can be a photoelectric converter. The second signal conversion unit has an input port and an output port. The input port of the second signal conversion unit is connected to the multi-mode expansion radio frequency card via an optical fiber, and the output port of the second signal conversion unit is connected to one of the input ports of the signal combining and splitting unit via a feeder. The function of the second signal conversion unit is to receive a second analog optical signal transmitted from the multi-mode expansion radio frequency card, demodulate the second analog optical signal to obtain a second radio frequency signal, and transmit the demodulated second radio frequency signal to the signal combining and splitting unit to obtain the second radio frequency signal.

[0021] In this way, by setting up a second signal conversion unit to convert the radio frequency signal into an analog optical signal, the signal processing device and the multi-mode expansion radio frequency card can be connected using optical fiber, thereby increasing the layout distance between the signal processing device and the multi-mode expansion radio frequency card.

[0022] In one possible implementation, the signal processing device further includes a third signal conversion unit. The third signal conversion unit is connected to the signal combining / splitting unit and the baseband processing unit, respectively, and is configured to receive a digital signal sent by the baseband processing unit, convert the digital signal into a third radio frequency signal, and transmit the third radio frequency signal to the signal combining / splitting unit.

[0023] The baseband processing unit is connected to the core network server of the primary operator, and is used to receive the digital signal sent by the core network server and send the digital signal to the third signal conversion device.

[0024] The third signal conversion device can be connected to the signal combining and splitting unit and the baseband processing unit through a feeder line.

[0025] The third signal conversion unit may be a digital-to-analog converter. The third signal conversion unit has an input port and an output port. The input port of the third signal conversion unit is connected to the baseband processing unit via a feeder line, and the output port of the third signal conversion unit is connected to the input port of the signal combining / splitting unit via a feeder line. The function of the third signal conversion unit is to receive a digital signal transmitted from the baseband processing unit, perform analog-to-digital conversion on the digital signal, obtain a third RF signal, and transmit the third RF signal to the signal combining / splitting unit.

[0026] In this way, by setting up a third signal conversion device, the digital signal sent by the baseband processing unit can be converted into a radio frequency signal, which is convenient for using the radio frequency signal for combining and splitting processing in the signal combining and splitting unit. Using radio frequency signals for combining processing can reduce the delay compared to using digital signals for combining processing. Frequency division multiplexing is used during combining processing to further reduce the delay.

[0027] In one possible implementation, the third signal conversion unit includes a first preprocessing subunit and a first signal conversion subunit. The first preprocessing subunit is connected to the baseband processing unit and is configured to receive a first digital signal sent by the baseband processing unit and preprocess the first digital signal to obtain a second digital signal. The first signal conversion subunit is connected to the first preprocessing subunit and the signal combining / splitting unit, respectively, and is configured to convert the second digital signal into a third RF signal and transmit the third RF signal to the signal combining / splitting unit.

[0028] The first preprocessing subunit has an input port and an output port. The input port of the first preprocessing subunit is connected to the baseband processing unit through a feeder, and the output port of the first preprocessing subunit is connected to the first signal conversion subunit through a feeder.

[0029] The baseband processing unit is connected to the core network server of the main operator, and is used to receive the first digital signal sent by the core network server and send the first digital signal to the first preprocessing subunit. After receiving the first digital signal, the first preprocessing subunit preprocesses the first digital signal to obtain a second digital signal and sends the second digital signal to the first signal conversion subunit.

[0030] Among them, preprocessing includes filtering and removing impurities, power adjustment and delay compensation.

[0031] The first signal conversion subunit may be a digital-to-analog converter. The first signal conversion subunit has an input port and an output port. The input port of the first signal conversion subunit is connected to the output port of the first preprocessing subunit via a feeder line, and the output port of the first signal conversion subunit is connected to another input port of the signal combining and splitting unit via a feeder line.

[0032] The first signal conversion subunit receives the second digital signal sent by the first signal conversion subunit, performs digital-to-analog conversion on the second digital signal to obtain a third radio frequency signal, and sends the third radio frequency signal to the signal combining and splitting unit.

[0033] In this way, the first preprocessing subunit can preprocess the first digital signal sent by the baseband processing unit to obtain a second digital signal to improve signal quality. The first signal conversion subunit can convert the first digital signal sent by the first preprocessing subunit into a third RF signal, facilitating the use of RF signals for combining the second and third RF signals in the signal combining and splitting unit. Using RF signals for combining can reduce latency compared to using digital signals for combining. Frequency division multiplexing is used during combining, further reducing latency.

[0034] In a possible implementation, the signal processing device further includes a first distribution unit. The first distribution unit is connected to the first signal conversion unit and is configured to distribute and transmit the first analog optical signal to a plurality of radio frequency signal remote devices.

[0035] The first distribution unit is an optical splitter and can be connected to the first signal conversion unit via an optical fiber and can be connected to multiple radio frequency signal remote devices via optical fibers.

[0036] The optical splitter may be a frequency splitter or a power splitter.

[0037] The first distribution unit is used to receive the first analog optical signal sent by the first signal conversion unit, and can perform optical splitting processing on the first analog optical signal to obtain multiple analog optical signals with the same power. The number of analog optical signals with the same power is the same as the number of radio frequency signal remote devices connected to the first distribution unit. Then, the first distribution unit sends an analog optical signal with the same power to each radio frequency signal remote device.

[0038] In this way, by providing the first distribution unit, the signal processing device can be connected to multiple radio frequency signal remote devices, which can improve the layout flexibility between the signal processing device and the multiple radio frequency signal remote devices.

[0039] In a second aspect, embodiments of the present disclosure provide a multi-mode expansion radio frequency card, comprising a radio frequency signal transceiver unit and a fourth signal conversion unit. The radio frequency signal transceiver unit is configured to receive a fourth radio frequency signal and preprocess the fourth radio frequency signal to obtain a fifth radio frequency signal. The fourth signal conversion unit is connected to the radio frequency signal transceiver unit and is configured to convert the fifth radio frequency signal into a second analog optical signal and transmit the second analog optical signal to a signal processing device.

[0040] The multi-mode expansion radio frequency card can be an independently installed device. The multi-mode expansion radio frequency card and the baseband processing unit can both be installed in the computer room of the user gathering area, and the two can be arranged in the form of separate network elements. Alternatively, the multi-mode expansion radio frequency card is installed outside the computer room and the baseband processing unit is installed inside the computer room. For example, the multi-mode expansion radio frequency card can be installed inside the base station on the top of the building, or in the weak current box in the building corridor. The multi-mode expansion radio frequency card can be installed together with other devices. For example, the multi-mode expansion radio frequency card and the baseband processing unit can both be installed in the computer room of the user gathering area, and the two can be installed in the same chassis.

[0041] In a possible implementation, the signal receiving unit may be a radio frequency transceiver. The signal receiving unit may receive and transmit the fourth radio frequency signal and preprocess at least one radio frequency signal including the fourth radio frequency signal to obtain a fifth radio frequency signal.

[0042] Among them, preprocessing includes filtering and removing impurities, power adjustment and delay compensation.

[0043] In this way, by configuring the signal receiving unit to pre-process the fourth radio frequency signal, the signal quality can be improved.

[0044] The signal transceiver unit can transmit and receive radio frequency signals of multiple different frequency bands including the fourth radio frequency signal, and preprocess the radio frequency signals of multiple different frequency bands including the fourth radio frequency signal to obtain multiple preprocessed radio frequency signals including the fifth radio frequency signal.

[0045] The signal transceiver unit includes multiple input ports and multiple output ports. Each input port is used to receive a corresponding RF signal in a frequency band and preprocess the RF signal in the frequency band to obtain a preprocessed RF signal in the frequency band. The multiple output ports correspond one-to-one with the multiple input ports. Each output port is connected to the fourth signal conversion unit via a feeder line and is used to transmit the preprocessed RF signal corresponding to the output port to the fourth signal conversion unit.

[0046] In this way, the signal transceiver unit can simultaneously transmit and receive radio frequency signals of multiple frequency bands, thereby improving the transmission and reception efficiency.

[0047] The fourth signal conversion unit may be an electro-optical converter. The fourth signal conversion unit has an input port and an output port, and the input port of the fourth signal conversion unit is connected to the output port of the RF signal transceiver unit via a feeder. The fourth signal conversion unit receives the fifth RF signal transmitted by the RF signal transceiver unit, modulates the fifth RF signal to obtain a second analog optical signal, and then transmits the second analog optical signal to the signal processing device.

[0048] In this way, by setting up the fourth signal conversion unit to convert the radio frequency signal into an analog optical signal, the multi-mode expansion radio frequency card and the signal processing device can be connected using optical fiber, thereby increasing the layout distance between the signal processing device and the multi-mode expansion radio frequency card.

[0049] In one possible implementation, the fourth signal conversion unit includes a combining / splitting subunit and a second signal conversion subunit. The RF signal transceiver unit is further configured to receive a sixth RF signal and preprocess the sixth RF signal to obtain a seventh RF signal. The combining / splitting subunit is connected to the RF signal transceiver unit and is configured to combine the fifth and seventh RF signals to obtain an eighth RF signal. The second signal conversion subunit is connected to the combining / splitting subunit and is configured to convert the eighth RF signal into a second analog optical signal and transmit the second analog optical signal to the signal processing device.

[0050] The radio frequency signal transceiver unit is further configured to receive a sixth radio frequency signal, and pre-process the sixth radio frequency signal to obtain a seventh radio frequency signal.

[0051] The fourth radio frequency signal comes from the first sub-operator, and the fifth radio frequency signal comes from the second sub-operator.

[0052] The RF signal transceiver unit includes a first input port, a second input port, a first output port, and a second output port. The first input port is used to receive a fourth RF signal, and the second input port is used to send a fifth RF signal to the combiner / splitter sub-unit. The second input port is used to receive the fifth RF signal, and the second output port is short-circuited to send a seventh RF signal to the combiner / splitter sub-unit.

[0053] The combining and splitting subunit can be a radio frequency combiner and splitter. The signal combining and splitting subunit has two input ports and one output port. The two input ports are respectively connected to the first output port and the second output port of the radio frequency signal transceiver unit via feeders, and the output port of the signal combining and splitting subunit is connected to the second signal conversion subunit via a feeder. The two input ports receive the fifth radio frequency signal and the seventh radio frequency signal, respectively. The fifth radio frequency signal and the seventh radio frequency signal are combined and processed in the combining and splitting subunit to obtain the eighth radio frequency signal, and the eighth radio frequency signal is sent to the second signal conversion subunit.

[0054] The combining and splitting subunit adopts frequency division multiplexing when performing combining processing, and the eighth radio frequency signal may be a mixed signal of the fifth radio frequency signal and the seventh radio frequency signal.

[0055] This prevents interference between the fifth and seventh radio frequency signals during transmission. Furthermore, direct radio frequency signal combining reduces latency. Furthermore, by employing frequency division multiplexing, radio frequency signals from multiple frequency bands can be transmitted without the need for framing. Each operator can utilize all available time resources, and signals from multiple operators can be transmitted simultaneously through signal processing equipment, further reducing latency.

[0056] The second signal conversion subunit may be an electro-optical converter having an input port and an output port, wherein the input port of the second signal conversion subunit is connected to the output port of the signal processing subunit via a feeder line, and the output port of the second signal conversion subunit is connected to the signal processing device via an optical fiber.

[0057] The second signal conversion subunit receives the eighth radio frequency signal sent by the combining and splitting subunit, modulates the eighth radio frequency signal to obtain a second analog optical signal, and sends the second analog optical signal to the signal processing device.

[0058] In this way, by setting up a second signal conversion subunit to convert the radio frequency signal into an analog optical signal, the signal processing device and the multi-mode expansion radio frequency card can be connected using optical fiber, thereby increasing the layout distance between the signal processing device and the multi-mode expansion radio frequency card.

[0059] In a possible implementation, the multi-mode extension radio frequency card further includes a second distribution unit connected to the fourth signal conversion unit, and configured to distribute and transmit the second analog optical signal to a plurality of signal processing devices.

[0060] The second distribution unit is an optical splitter and can be connected to the fourth signal conversion unit via an optical fiber and connected to the signal processing device via an optical fiber.

[0061] The optical splitter may be a frequency splitter or a power splitter.

[0062] The second distribution unit is used to receive the second analog optical signal sent by the fourth signal conversion unit, and can perform optical splitting processing on the second analog optical signal to obtain multiple analog optical signals with the same power. The analog optical signals with the same power are the same in number as the radio frequency signal extension devices connected to the second distribution unit. Then, the second distribution unit sends an analog optical signal with the same power to each signal device.

[0063] In this way, by setting up the second distribution unit, the multi-mode extension radio frequency card can be connected to multiple signal processing devices, which can improve the layout flexibility between the multi-mode extension radio frequency card and the signal processing devices.

[0064] In a third aspect, embodiments of the present disclosure provide a radio frequency signal extension device, comprising a fifth signal conversion unit and a radio frequency transceiver circuit unit. The fifth signal conversion unit is configured to receive a first analog optical signal transmitted by a signal processing device and convert the first analog optical signal into a ninth radio frequency signal. The radio frequency transceiver circuit unit is configured to transmit the ninth radio frequency signal.

[0065] Among them, the radio frequency signal extension device can be set on the top of a building in the user gathering area to communicate with the user terminals in the user gathering area.

[0066] The fifth signal conversion unit may be an optical-to-electrical converter, and is connected to the first signal conversion unit in the signal processing device via an optical fiber. The fifth signal conversion unit is configured to receive the first analog optical signal transmitted by the first signal conversion unit, demodulate the first analog optical signal to obtain a ninth radio frequency signal, and then transmit the ninth radio frequency signal to the radio frequency transceiver circuit unit.

[0067] The radio frequency transceiver circuit unit may be an RRU (Remote Radio Unit).

[0068] In this way, through the radio frequency signal extension device, multiple operators can communicate with user terminals in the user gathering area, thereby improving the communication quality of users.

[0069] In a fourth aspect, an embodiment of the present disclosure provides a communication system, which includes the signal processing device in the first aspect and its possible implementation methods, the multi-mode expansion radio frequency card in the second aspect and its possible implementation methods, the baseband processing unit and the baseband processing unit in the third aspect and its possible implementation methods, the multi-mode expansion radio frequency card, the radio frequency signal extension device, and the baseband processing unit are all connected to the signal processing device. BRIEF DESCRIPTION OF THE DRAWINGS

[0070] FIG1 is a schematic diagram of the distribution of a user gathering area provided by an embodiment of the present disclosure;

[0071] FIG2 is a schematic structural diagram of a signal processing device provided by an embodiment of the present disclosure;

[0072] FIG3 is a schematic structural diagram of a signal processing device and a multi-mode expansion radio frequency card provided in an embodiment of the present disclosure;

[0073] FIG4 is a schematic structural diagram of a signal processing device provided by an embodiment of the present disclosure;

[0074] FIG5 is a schematic structural diagram of a signal processing device provided by an embodiment of the present disclosure;

[0075] FIG6 is a schematic structural diagram of a signal processing device provided by an embodiment of the present disclosure;

[0076] FIG7 is a schematic structural diagram of a signal processing device and a multi-mode expansion radio frequency card provided in an embodiment of the present disclosure;

[0077] FIG8 is a schematic structural diagram of a multi-mode expansion radio frequency card provided in an embodiment of the present disclosure;

[0078] FIG9 is a schematic structural diagram of a radio frequency signal remote device provided in an embodiment of the present disclosure;

[0079] FIG10 is a schematic structural diagram of a communication system provided by an embodiment of the present disclosure;

[0080] FIG11 is a schematic structural diagram of a radio frequency signal transceiver unit provided in an embodiment of the present disclosure.

[0081] Legend

[0082] 1. Signal processing equipment;

[0083] 11. Signal combining and splitting unit; 12. First signal conversion unit; 13. Second signal conversion unit; 14. Third signal conversion unit; 15. First distribution unit;

[0084] 141. First pre-processing subunit; 142. First signal conversion subunit;

[0085] 2. Multi-mode expansion radio frequency card;

[0086] 21. RF signal transceiver unit; 22. Fourth signal conversion unit; 23. Second distribution unit;

[0087] 211, radio frequency pre-processing subunit; 212, third signal conversion subunit; 213, second pre-processing subunit; 214, fourth signal conversion subunit;

[0088] 221, combining and splitting subunit; 222, second signal conversion subunit;

[0089] 3. RF signal extension equipment;

[0090] 31. Fifth signal conversion unit; 32. Radio frequency transceiver circuit unit;

[0091] 4. Baseband processing unit. DETAILED DESCRIPTION

[0092] In order to make the objectives, technical solutions and advantages of the present disclosure more clear, the embodiments of the present disclosure will be further described in detail below with reference to the accompanying drawings.

[0093] Unless otherwise defined, the technical or scientific terms used herein shall have the ordinary meaning understood by persons of ordinary skill in the field to which the present disclosure belongs. The terms "first", "second", "third" and similar words used in the patent disclosure specification and claims of the present disclosure do not indicate any order, quantity or importance, but are only used to distinguish different components. Similarly, terms such as "one" or "a" do not indicate a quantity limitation, but rather indicate the presence of at least one. Terms such as "include" or "comprising" mean that the elements or objects appearing before "include" or "comprising" include the elements or objects listed after "include" or "comprising" and their equivalents, and do not exclude other elements or objects. Terms such as "connected" or "connected" are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. Terms such as "upper", "lower", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0094] Nowadays, users will choose different operators for communication according to their own needs.

[0095] In one possible scenario, for a user-intensive area (such as a cell), users using the network services of operators A, B, and C coexist in the area. Operator C has already established a presence in the area, meaning that operator C has installed a complete base station (base station C) within the area. Meanwhile, operators A and B do not have a presence in the area, meaning that their complete base stations are not installed.

[0096] At this point, in order to improve the communication quality of users in the user gathering area, operators A and B can choose to respectively install complete base stations in the user gathering area. Alternatively, they can respectively install indoor communication systems in the user gathering area and add MERCs to base station C. They can use the indoor communication systems to communicate with the added MERCs, and then use the first operator's base station to improve the communication quality of their own users in the user gathering area. Considering the product landing cost of the complete base station and the coordination cost with the community property when installing the complete base station, the latter is usually used to improve communication quality.

[0097] In related technologies, communication between indoor communication systems and MERCs is carried out by transmitting and receiving radio frequency signals. Upon receiving the radio frequency signals from the indoor communication system, the MERCs convert them into digital signals and then combine them, employing ten-digit multiplexing when appropriate. This results in each operator being limited to a portion of the time resources, resulting in high latency.

[0098] In another possible scenario, referring to Figure 1, a certain area includes three user gathering areas, wherein the first user gathering area may be an office park, and the second user gathering area and the third user gathering area may be residential communities. Alternatively, the first user gathering area, the second user gathering area and the first user gathering area may be three adjacent industrial parks. The area has three operators providing communication services, namely, operator A, operator B and operator C. Each operator has deployed base stations in a specific user gathering area (the base stations deployed by operator A, operator B and operator C are called base station A, base station B and base station C, respectively) to improve the communication quality of their own communication services in this specific user gathering area.

[0099] As shown in Figure 1 (the dotted circles in the figure represent the coverage areas corresponding to base station A, base station B, and base station C respectively), operator A has base station A deployed in the third user gathering area, operator B has base station B deployed in the second user gathering area, and operator C has base station C deployed in the first user gathering area. For operator A, base station A cannot cover the first user area. If it wants to improve its communication quality in the first user area, the first arrangement method is to rearrange base station A in the first user area. The second arrangement method is to add a multimode extended radio card (MERC) to base station C, use base station A to communicate with the added MERC, and then use base station C to improve the communication quality of its own users in the first user gathering area (the same applies to operator B). At present, in various regions of the world, in order to reduce the cost of deploying base stations, most operators adopt the second arrangement method.

[0100] Operator C has deployed base station C in the first user gathering area, while operators A and B have not deployed base stations in the first user gathering area. At this time, operators A and B can jointly add a MERC in base station C. Operator A and operator B use base station A and base station B respectively to communicate with the added MERC, and then use base station C to improve the communication quality of their own users in the first user gathering area.

[0101] In the related technology, base station A, base station B and the added MERC communicate by sending and receiving radio frequency signals. After receiving the radio frequency signals from operators A and B, base station C converts the radio frequency signals (analog signals) of operators A and B into digital signals (hereinafter referred to as A digital signal and B digital signal), and combines the A digital signal and the B digital signal to obtain the AB combined signal. Then, the AB combined signal is combined with the C digital signal received from the core network of operator C to obtain the ABC combined signal. Through the ABC combined signal, the communication quality of users of each operator in the first user gathering area is improved. In this communication mode, operator C can be called the main operator, and operators A and B can be called the first sub-operator and the second sub-operator, respectively. When combining the digital signals of the first and second sub-operators, and the primary and secondary operators, the digital signals are all framed. The sub-frames of operators A, B, and C are sorted according to a predetermined rule to create a combined signal, which is then transmitted over a channel. Under these predetermined rules, operator A can only use the channel to transmit signals within the first unit of time, operator B can only use the channel to transmit signals within the second unit of time, operator C can only use the channel to transmit signals within the third unit of time, and so on. Therefore, each operator can only use a portion of the time resources, resulting in higher latency. Furthermore, the RF signals of the shared operators must undergo multiple combining processes, resulting in more frequent signal processing, further increasing latency.

[0102] An embodiment of the present disclosure provides a signal processing device 1, as shown in FIG2 , which includes a signal combining and splitting unit 11 and a first signal conversion unit 12. The signal combining and splitting unit 11 is configured to combine multiple RF signals in different frequency bands to obtain a first RF signal. The first signal conversion unit 12 is connected to the signal combining and splitting unit 11 and is configured to convert the first RF signal into a first analog optical signal and transmit the first analog optical signal to the RF signal remote device 3.

[0103] Among them, multiple radio frequency signals of different frequency bands are provided by the baseband processing unit 4 and the multi-mode expansion radio frequency card 2 respectively, and the signal combining and splitting unit 11 combines the multiple radio frequency signals of different frequency bands using frequency division multiplexing.

[0104] The signal combining and splitting unit 11 and the first signal conversion unit 12 can be connected via a wire, which can be a network cable, such as a twisted pair cable.

[0105] Thus, compared to the related art using digital signals for combining and processing, the present disclosure uses radio frequency signals for combining and processing, which can reduce latency. Furthermore, because the signals of each operator are combined and processed using frequency division multiplexing in the signal combining and splitting unit 11, each operator can use the signal processing device 1 to transmit signals within any unit of time. That is, each operator can use all time resources, and signals from multiple operators can pass through the signal processing device 1 simultaneously, further reducing latency.

[0106] Exemplarily, the signal combining and splitting unit 11 may be a radio frequency combiner, configured to combine radio frequency signals of multiple different frequency bands to obtain a first radio frequency signal.

[0107] In this way, compared with directly transmitting multiple RF signals of different frequency bands, the RF signals of different frequency bands are first combined and then the first RF signal obtained after the combination is transmitted. This can avoid interference between the RF signals of different frequency bands and thus improve the transmission quality of the signal.

[0108] Exemplarily, the first signal conversion unit 12 may be an electro-optical converter, configured to convert the first radio frequency signal into a first analog optical signal.

[0109] The signal processing device 1 can be a standalone device. It can be installed in a computer room in a user-concentrated area, or in a weak-current cabinet in a building within the user-concentrated area. The signal processing device 1 can also be integrated into a RHUB (Radio Hub), which can be installed in a computer room in a user-concentrated area, or in a weak-current cabinet in a building within the user-concentrated area.

[0110] In some possible embodiments, the signal processing device 1 is arranged in a computer room in the first user gathering area. The computer room may also be provided with a baseband processing unit 4 and a multi-mode expansion radio frequency card 2. The signal processing device 1 is connected to the multi-mode expansion radio frequency card 2 via an optical fiber, and the signal processing device 1 is connected to the radio frequency signal extension device 3 arranged on the outdoor roof via an optical fiber.

[0111] In one example, the signal processing device 1 and the baseband processing unit 4 can be connected via a CPRI (Common Public Radio Interface), or the signal processing device 1 and the baseband processing unit 4 can be connected via an enhanced eCPRI (Enhanced Common Public Radio Interface).

[0112] In implementation, the baseband processing unit 4 is connected to the core network server of the primary operator, and is used to receive a digital signal sent by the core network server of the primary operator and send the digital signal to the signal processing device 1. The multi-mode extension radio frequency card 2 is used to receive a radio frequency signal sent by base station A, or receive a radio frequency signal sent by base station B, or receive radio frequency signals sent by base stations A and B at the same time, and send the radio frequency signal to the signal processing device 1.

[0113] In one example, the baseband processing unit 4 can be connected to the core network server of the primary operator via optical fiber, and the baseband processing unit 4 can be connected to the signal processing device 1 via a twisted pair cable. The multi-mode extension radio frequency card 2 is communicatively connected to the radio frequency signal extension device 3 in base station A and is connected to the signal processing device 1 via optical fiber.

[0114] During implementation, the radio frequency signal remote device 3 in base station A can send the radio frequency signal of the first secondary operator to the multi-mode extension radio frequency card 2 in the form of radio waves.

[0115] Optionally, the connection method between the signal processing device 1 and the multi-mode expansion radio frequency card 2 can depend on the distance between the two. When the distance between the signal processing device 1 and the multi-mode expansion radio frequency card 2 is less than a preset distance, such as when both the signal processing device 1 and the multi-mode expansion radio frequency card 2 are located in a computer room in a user-concentrated area, the signal processing device 1 and the multi-mode expansion radio frequency card 2 can be connected via a twisted pair cable.

[0116] The numerical value of the preset distance can be set by technicians according to actual needs, for example, 10m (meters), 20m, etc. The embodiment of the present disclosure does not limit the numerical value of the preset distance.

[0117] In some possible embodiments, as shown in FIG3 , the signal processing device 1 further includes a second signal conversion unit 13 .

[0118] When the distance between the signal processing device 1 and the multi-mode extension radio frequency card 2 is greater than or equal to a preset distance, for example, the signal processing device 1 is installed in a computer room in a user-concentrated area, and the multi-mode extension radio frequency card 2 is installed in a weak current box in a building in the user-concentrated area, the signal processing device 1 and the multi-mode extension radio frequency card 2 can be connected via an optical fiber. In this case, the signal processing device 1 further includes a second signal conversion unit 13.

[0119] The second signal conversion unit 13 is connected to the signal combining and splitting unit 11 and the multi-mode expansion radio frequency card 2 respectively, and is used to receive the second analog optical signal sent by the multi-mode expansion radio frequency card 2, and convert the second analog optical signal into a second radio frequency signal, and transmit the second radio frequency signal to the signal combining and splitting unit 11.

[0120] The second RF signal may include only the signal of the first sub-operator, or only the signal of the second sub-operator, or may include both the signals of the first sub-operator and the second sub-operator.

[0121] Exemplarily, the second signal conversion unit 13 is a photoelectric converter, and the second signal conversion unit 13 can be connected to the signal combining and decomposing unit 11 through a twisted pair cable, and connected to the multi-mode extension radio frequency card 2 through an optical fiber.

[0122] In some possible embodiments, the signal processing device 1 further includes a third signal conversion unit 14 .

[0123] As shown in Figure 4, the third signal conversion unit 14 is respectively connected to the signal combining and splitting unit 11 and the baseband processing unit 4, and is used to receive the digital signal sent by the baseband processing unit 4, and convert the digital signal into a third RF signal, and transmit the third RF signal to the signal combining and splitting unit 11.

[0124] Exemplarily, the third signal conversion unit 14 is a digital-to-analog converter, and the third signal conversion unit 14 can be connected to the signal combining and decomposing unit 11 through a twisted pair cable, and can be connected to the baseband processing unit 4 through a twisted pair cable.

[0125] Optionally, as shown in FIG. 5 , the third signal conversion unit 14 may include a first preprocessing subunit 141 and a first signal conversion subunit 142 .

[0126] The first pre-processing sub-unit 141 is connected to the baseband processing unit 4 and is configured to receive a first digital signal sent by the baseband processing unit 4 and pre-process the first digital signal to obtain a second digital signal.

[0127] Exemplarily, the first pre-processing sub-unit 141 may be a DIF (Digital Intermediate Frequency) unit.

[0128] Furthermore, the preprocessing performed by the first preprocessing subunit 141 on the first digital signal may include:

[0129] (1) Filter and remove impurities from the first digital signal.

[0130] In implementation, the first preprocessing subunit 141 is configured to filter and remove impurities from the first digital signal to improve signal quality. The baseband processing unit 4 is connected to the core network server of the primary operator and is configured to receive the first digital signal from the core network server and transmit the first digital signal to the first preprocessing subunit 141. The first digital signal may not have been filtered or removed. Directly converting the first digital signal into a radio frequency signal for combining will degrade the signal quality of the first radio frequency signal.

[0131] Accordingly, the first preprocessing sub-unit 141 filters and removes impurities on the first digital signal to obtain a second digital signal, which can improve the signal quality of the subsequently obtained first RF signal. At the same time, since some redundant data is deleted when filtering and removing impurities on the first digital signal, the second digital signal obtained after processing can be made more streamlined, the data volume of the second digital signal is reduced, and the transmission delay of the signal of the main operator is reduced.

[0132] (2) Power adjustment is performed on the first digital signal.

[0133] In implementation, the baseband processing unit 4 is connected to the core network server of the primary operator, and is used to receive the first digital signal sent by the core network server and send the first digital signal to the first pre-processing sub-unit 141. The first digital signal is converted into a first analog optical signal after passing through the first pre-processing sub-unit 141, the first signal conversion sub-unit 142, the signal combining and splitting unit 11, and the first signal conversion unit 12 in sequence, and is transmitted to the radio frequency signal extension device 3. In the radio frequency signal extension device 3, after the first analog optical signal is converted into a radio frequency signal, it is transmitted to the user end or the MERC of other user gathering areas. When the first analog optical signal is converted into a radio frequency signal, it is necessary to determine the power of the radio frequency signal. That is, after receiving the first digital signal sent by the baseband processing unit 4, the first pre-processing sub-unit 141 will adjust the power definition of the first digital signal, add the power indication data corresponding to the first digital signal to the first digital signal, obtain the second digital signal, and then transmit the second digital signal to the first signal conversion sub-unit 142.

[0134] The power indication data corresponding to the first digital signal is used to indicate the power of the radio frequency signal transmitted by the radio frequency signal remote device 3 .

[0135] In this way, the power of the radio frequency signal transmitted by the radio frequency signal remote device 3 can be defined, and the power of the radio frequency signal transmitted by the radio frequency signal remote device 3 can be determined according to actual needs.

[0136] (3) Perform time delay compensation on the first digital signal.

[0137] The baseband processing unit 4 sends a first digital signal to the first preprocessing subunit 141. The first digital signal passes through the first preprocessing subunit 141 and the first signal conversion subunit 142 in sequence to obtain a third RF signal. Then, the third RF signal is sent to the signal combining and splitting unit 11. In the signal combining and splitting unit 11, the third RF signal is combined with the second RF signal to obtain a first RF signal.

[0138] When the signal combining and splitting unit 11 performs combining processing, if the time delays of the third RF signal and the second RF signal are inconsistent, the coverage range of the main operator signal and the coverage range of the secondary operator signal will be inconsistent after the first RF signal is transmitted to the RF signal extension device 3 and transmitted. For example, if the time delay of the third RF signal is lower than the time delay of the second RF signal, the coverage range of the main operator signal will be greater than the coverage range of the secondary operator signal. If the time delay of the third RF signal is higher than the time delay of the second RF signal, the coverage range of the main operator signal will be smaller than the coverage range of the secondary operator signal.

[0139] In implementation, the first pre-processing sub-unit 141 adjusts the delay of the first digital signal so that the delays of the third RF signal and the second RF signal are equal.

[0140] In this way, after the first preprocessing subunit 141 compensates the delay of the first digital signal, the delay of the third radio frequency signal can be made equal to the delay of the second radio frequency signal, thereby making the coverage range of the main operator signal and the coverage range of the secondary operator signal consistent, which can improve the consistency of the coverage range of the communication system and facilitate the layout planning of the multi-area communication system.

[0141] In one example, when the distance between the signal processing device 1 and the multi-mode extension radio frequency card 2 is less than a preset distance, the first pre-processing sub-unit 141 and the multi-mode extension radio frequency card 2 can be connected via a twisted pair. When the distance between the signal processing device 1 and the multi-mode extension radio frequency card 2 is greater than or equal to the preset distance, the first pre-processing sub-unit 141 and the multi-mode extension radio frequency card 2 can be connected via an optical fiber.

[0142] The first signal conversion subunit 142 is connected to the first preprocessing subunit 141 and the signal combining and splitting unit 11 respectively, and is used to convert the second digital signal into a third radio frequency signal and transmit the third radio frequency signal to the signal combining and splitting unit 11.

[0143] For example, the first signal conversion subunit 142 is a digital-to-analog converter, and the first signal conversion subunit 142 can be connected to the first pre-processing subunit 141 and the signal combining and decomposing unit 11 through twisted-pair cables.

[0144] In some possible embodiments, the signal processing device further includes a first distribution unit 15 .

[0145] As shown in FIG6 , the first distribution unit 15 is connected to the first signal conversion unit 12 , and is configured to distribute and transmit the first analog optical signal to the radio frequency signal remote device 3 .

[0146] The first distribution unit 15 and the first signal conversion unit 12 can be connected via an optical fiber. The first distribution unit 15 can be a frequency splitter or a power splitter. The embodiment of the present disclosure does not limit the type of the first distribution unit 15.

[0147] In one example, the first distribution unit 15 is a power splitter, and is connected to multiple RF signal extension devices 3 via optical fibers. The first distribution unit 15 performs optical splitting processing on the first analog optical signal to obtain multiple processed analog optical signals with the same power, and transmits each analog optical signal with the same power to a corresponding RF signal extension device 3, wherein each processed analog optical signal has the same signal content.

[0148] The embodiment of the present disclosure provides a multi-mode expansion radio frequency card 2 , which is connected to a signal processing device 1 .

[0149] The multi-mode expansion radio frequency card 2 can be a standalone device, that is, the multi-mode expansion radio frequency card 2 and the baseband processing unit 4 can be arranged in the form of separate network elements. The multi-mode expansion radio frequency card 2 can be installed together with other devices. For example, the multi-mode expansion radio frequency card 2 and the baseband processing unit 4 can be set in the same frame. The embodiments of this disclosure do not limit the installation form of the multi-mode expansion radio frequency card 2.

[0150] The multi-mode expansion radio frequency card 2 can be installed in a machine room in a user gathering area, or inside a base station on the top of a building, and connected to the signal processing device 1. The embodiment of the present disclosure does not limit the installation location of the multi-mode expansion radio frequency card 2.

[0151] As shown in Figure 3, the multi-mode expansion radio frequency card 2 includes a radio frequency signal transceiver unit 21 and a fourth signal conversion unit 22. The radio frequency signal transceiver unit 21 is configured to receive the fourth radio frequency signal and pre-process the fourth radio frequency signal to obtain a fifth radio frequency signal. The fourth signal conversion unit 22 is connected to the radio frequency signal transceiver unit 21 and is configured to convert the fifth radio frequency signal into a second analog optical signal and transmit the second analog optical signal to the signal processing device 1.

[0152] The radio frequency signal transceiver unit 21 and the fourth signal conversion unit 22 may be connected via a twisted pair cable.

[0153] During implementation, the multi-mode expansion radio frequency card 2 is set in the first user gathering area, and the radio frequency signal transceiver unit 21 is communicated with the radio frequency signal extension device 3 in the A base station set in the third user area, and is used to receive the fourth radio frequency signal sent by the radio frequency signal extension device 3 in the A base station, and pre-process the fourth radio frequency signal to obtain the fifth radio frequency signal.

[0154] In some possible embodiments, as shown in FIG. 11 , the RF signal transceiver unit 21 includes a RF preprocessing subunit 211 , a third signal conversion subunit 212 , a second preprocessing subunit 213 , and a fourth signal conversion subunit 214 .

[0155] The radio frequency pre-processing sub-unit 211 , the third signal conversion sub-unit 212 , the second pre-processing sub-unit 213 and the fourth signal conversion sub-unit 214 are connected in sequence.

[0156] The RF pre-processing sub-unit 211 is communicatively connected to the RF signal remote device 3 in base station A, and is configured to receive the fourth RF signal sent by the RF signal remote device 3 in base station A and perform filtering and impurity removal processing on the fourth RF signal.

[0157] Exemplarily, the radio frequency pre-processing sub-unit 211 may be a TRX (Transmit Receive Unit).

[0158] During implementation, when the RF signal extension device 3 in base station A transmits the fourth RF signal, the fourth RF signal may not have been filtered or the fourth RF signal may carry interference close to the frequency band. At this time, if the fourth RF signal is converted into an analog optical signal and transmitted to the signal processing device 1 for combining, the signal quality of the first RF signal will be reduced.

[0159] Therefore, the RF pre-processing sub-unit 211 needs to perform filtering and impurity removal processing on the fourth RF signal at the analog signal level to obtain the fourth RF signal after carrier impurities are removed, thereby improving signal quality.

[0160] Optionally, the RF preprocessing subunit 211 may also be configured to record the power of the fourth RF signal.

[0161] In implementation, the power of the fourth RF signal received by the RF pre-processing sub-unit 211 may be greater than the preset power, or may be less than the preset power.

[0162] The preset power is the power of the radio frequency signal transmitted by the radio frequency signal extension device 3 in the base station of the primary operator.

[0163] When the power of the fourth RF signal is greater than the preset power, the RF preprocessing subunit 211 may be configured to determine a first difference between the power of the fourth RF signal and the preset power, and add first power padding indication data corresponding to the first difference to the fourth RF signal. When the preset power is greater than the power of the fourth RF signal, the RF preprocessing subunit 211 may be configured to determine a second difference between the preset power and the power of the fourth RF signal, and add second power padding indication data corresponding to the second difference to the fourth RF signal, thereby determining the power to be padded to the fourth RF signal.

[0164] Exemplarily, the third signal conversion subunit 212 may be connected to the RF preprocessing subunit 211 via a twisted pair cable.

[0165] The third signal conversion subunit 212 is configured to convert the fourth radio frequency signal after the carrier is cleaned into a third digital signal, and then send the third digital signal to the second pre-processing subunit 213 .

[0166] The second preprocessing subunit 213 is configured to receive the third digital signal sent by the third signal conversion subunit 212 and preprocess the third digital signal to obtain a fourth digital signal.

[0167] Furthermore, the preprocessing performed by the second preprocessing subunit 213 on the third digital signal may include:

[0168] (1) Perform filtering and removing impurities on the third digital signal.

[0169] In implementation, since the standards and protocols used for signal transmission in the base station of the primary operator (i.e., base station C) and the base station of the secondary operator (i.e., base station A) may be different, the formats of the second RF signal and the third RF signal may be different. To this end, the fourth RF signal can be first converted into a third digital signal in the MERC of the primary operator's base station, and then the third digital signal is preprocessed to obtain a fourth digital signal. Then, the fourth digital signal is converted into a fifth RF signal to unify the formats of the fifth RF signal and the third RF signal. The third digital signal may not have been filtered and de-interleaved at the digital signal level. Therefore, after filtering and de-interleaving the third digital signal, the signal quality of the subsequently obtained first RF signal can be improved.

[0170] (2) Perform power adjustment on the third digital signal.

[0171] In implementation, the second pre-processing sub-unit 213 may determine the power indication data corresponding to the third digital signal based on the first power padding indication data or the second power padding indication data. That is, after receiving the third digital signal sent by the baseband processing unit 4, the second pre-processing sub-unit 213 may perform a power definition adjustment on the third digital signal, add the power indication data corresponding to the third digital signal to the third digital signal, obtain a fourth digital signal, and then transmit the fourth digital signal to the first signal conversion sub-unit 142.

[0172] The power indication data corresponding to the third digital signal is used to indicate the power of the radio frequency signal transmitted by the radio frequency signal remote device 3 .

[0173] In this way, the power of the radio frequency signal transmitted by the radio frequency signal remote device 3 can be defined, and the power of the radio frequency signal transmitted by the radio frequency signal remote device 3 can be determined according to actual needs.

[0174] (3) Perform time delay compensation on the third digital signal.

[0175] The third signal conversion subunit 212 sends a third digital signal to the second preprocessing subunit 213. The third digital signal passes through the second preprocessing subunit 213, the fourth signal conversion subunit 214, the fourth signal conversion unit 22, and the second signal conversion unit 13 in sequence to obtain a second RF signal. Then, the second RF signal is sent to the signal combining and splitting unit 11. In the signal combining and splitting unit 11, the second RF signal and the third RF signal are combined to obtain a first RF signal.

[0176] When the signal combining and splitting unit 11 performs combining processing, if the time delays of the third RF signal and the second RF signal are inconsistent, the coverage range of the main operator signal and the coverage range of the secondary operator signal will be inconsistent after the first RF signal is transmitted to the RF signal extension device 3 and transmitted. For example, if the time delay of the third RF signal is lower than the time delay of the second RF signal, the coverage range of the main operator signal will be greater than the coverage range of the secondary operator signal. If the time delay of the third RF signal is higher than the time delay of the second RF signal, the coverage range of the main operator signal will be smaller than the coverage range of the secondary operator signal.

[0177] In implementation, the second pre-processing sub-unit 213 adjusts the delay of the third digital signal so that the delays of the third radio frequency signal and the second radio frequency signal are equal.

[0178] In this way, after the second preprocessing sub-unit 213 compensates the delay of the third digital signal, the delay of the third RF signal can be made equal to the delay of the second RF signal, thereby making the coverage range of the main operator signal and the coverage range of the secondary operator signal consistent, which can improve the consistency of the coverage range of the communication system and facilitate the layout planning of the multi-area communication system.

[0179] Exemplarily, the third signal conversion subunit 212 , the second pre-processing subunit 213 and the fourth signal conversion subunit 214 may be different components of a ROC (Radio on Chip).

[0180] In some possible embodiments, the RF signal transceiver unit 21 is further configured to receive a sixth RF signal, and preprocess the sixth RF signal to obtain a seventh RF signal.

[0181] During implementation, the multi-mode expansion radio frequency card 2 is set in the first user gathering area, and the radio frequency signal transceiver unit 21 is communicated with the radio frequency signal extension device 3 in the B base station set in the second user area, and is used to receive the sixth radio frequency signal sent by the radio frequency signal extension device 3 in the B base station, and pre-process the sixth radio frequency signal to obtain the seventh radio frequency signal.

[0182] The specific process of the RF signal transceiver unit 21 preprocessing the sixth RF signal to obtain the seventh RF signal is similar to the specific process of the RF signal transceiver unit 21 preprocessing the fourth RF signal to obtain the fifth RF signal, and will not be repeated here.

[0183] 7 , the fourth signal conversion unit 22 includes a combining / splitting subunit 221 and a second signal conversion subunit 222. The combining / splitting subunit 221 is connected to the RF signal transceiver unit 21 and is configured to combine the fifth RF signal and the seventh RF signal to obtain an eighth RF signal.

[0184] Exemplarily, the combining / splitting sub-unit 221 may be a radio frequency combiner, configured to combine the fifth radio frequency signal and the seventh radio frequency signal to obtain the eighth radio frequency signal.

[0185] In this way, compared to directly transmitting the fifth and sixth radio frequency signals, first combining the fifth and seventh radio frequency signals and then transmitting the eighth radio frequency signal obtained after combining, interference between the fifth and sixth radio frequency signals can be avoided, thereby improving the transmission quality of the signal. At the same time, the wiring in the multi-mode expansion radio frequency card 2 can be made simpler.

[0186] Exemplarily, the second signal conversion subunit 222 may be an electro-optical converter, configured to convert the eighth radio frequency signal into a second analog optical signal.

[0187] In some possible embodiments, the multi-mode extension radio frequency card 2 further includes a second distribution unit 23 .

[0188] As shown in FIG. 8 , the second distribution unit 23 is connected to the fourth signal conversion unit 22 , and is configured to distribute and transmit the second analog optical signal to the signal processing device 1 .

[0189] The second distribution unit 23 can be connected to the first signal conversion unit 12 via an optical fiber. The second distribution unit 23 can be a frequency splitter or a power splitter. The embodiment of the present disclosure does not limit the type of the second distribution unit 23.

[0190] In one example, the second distribution unit 23 is a power splitter, and the second distribution unit 23 is connected to multiple signal processing devices 1 via optical fibers. The second distribution unit 23 performs splitting processing on the second analog optical signal to obtain multiple processed analog optical signals with the same power, and transmits each analog optical signal with the same power to a corresponding signal processing device 1, wherein each processed analog optical signal has the same signal content.

[0191] An embodiment of the present disclosure provides a radio frequency signal extension device 3. As shown in Figure 9, the radio frequency signal extension device 3 includes a fifth signal conversion unit 31 and a radio frequency transceiver circuit unit 32. The fifth signal conversion unit 31 is used to receive the first analog optical signal sent by the signal processing device 1 and convert the first analog optical signal into a ninth radio frequency signal. The radio frequency transceiver circuit unit 32 is used to transmit the ninth radio frequency signal.

[0192] Exemplarily, the radio frequency transceiver circuit unit 32 may be an RRU (Remote Radio Unit).

[0193] In practice, the radio frequency signal remote device 3 is usually set on the top of a building in the first user gathering area, and is used for communication connection with the terminal devices in the user area.

[0194] An embodiment of the present disclosure provides a communication system, which includes the above-mentioned signal processing device 1, a multi-mode expansion radio frequency card 2, a radio frequency signal remote device 3, and a baseband processing unit 4.

[0195] In this communication system, the signal processing device 1 includes a signal combining and splitting unit 11, a first signal conversion unit 12, a second signal conversion unit 13, and a third signal conversion unit 14. The multi-mode expansion radio frequency card 2 includes a radio frequency signal transceiver unit 21 and a fourth signal conversion unit 22. The radio frequency signal remote device 3 includes a fifth signal conversion unit 31 and a radio frequency transceiver circuit unit 32.

[0196] The third signal conversion unit 14 is communicatively connected to the baseband processing unit 4 and is also connected to the signal combining and splitting unit 11. The RF signal transceiver unit 21 is communicatively connected to the RF signal remote device 3 in base station A located in the third user area and the RF signal remote device 3 in base station B located in the second user area. The RF signal transceiver unit 21, the fourth signal conversion unit 22, the second signal conversion unit 13, and the signal combining and splitting unit 11 are sequentially connected. The signal combining and splitting unit 11, the fifth signal conversion unit 31, and the RF transceiver circuit unit 32 are sequentially connected.

[0197] The functions of the various components in the communication system can be referred to in the above description and will not be repeated here.

[0198] In the communication system, as shown in FIG10 , the process of transmitting a signal from the second user gathering area to the first user gathering area is as follows:

[0199] (1) The RF signal transceiver unit 21 receives the fourth RF signal from the RF signal remote device 3 in the A base station, preprocesses the fourth RF signal to obtain a fifth RF signal, and sends the fifth RF signal to the fourth signal conversion unit 22. After receiving the fifth RF signal, the fourth signal conversion unit 22 converts the fifth RF signal into a second analog optical signal and sends the second analog optical signal to the second signal conversion unit 13. The second signal conversion unit 13 receives the second analog optical signal, converts the second analog optical signal into a second RF signal, and sends the second RF signal to the signal combining and splitting unit 11. The signal combining and splitting unit 11 receives the second RF signal.

[0200] (2) The third signal conversion unit 14 receives the digital signal sent by the baseband processing unit 4, converts the digital signal into a third RF signal, and sends the third RF signal to the signal combining and splitting unit 11. The signal combining and splitting unit 11 receives the fourth RF signal.

[0201] (3) The signal combining and splitting unit 11 combines the second RF signal and the third RF signal to obtain a first RF signal, and sends the first RF signal to the first signal conversion unit 12. The first signal conversion unit 12 receives the first RF signal, converts the first RF signal into a first analog optical signal, and sends the first analog optical signal to the fifth signal conversion unit 31. The fifth signal conversion unit 31 receives the first analog optical signal, converts the first analog optical signal into a ninth RF signal, and sends the ninth RF signal to the RF transceiver circuit unit 32. The RF transceiver circuit unit 32 receives the ninth RF signal and sends the ninth RF signal to the user terminal.

[0202] In the communication system, for the process of simultaneously transmitting signals from the second user gathering area and the third user gathering area to the first user gathering area, the above process and the above RF signal transceiver unit 21 can be referred to for preprocessing the sixth RF signal to obtain the seventh RF signal, which will not be repeated here.

[0203] For this communication system, during the process of signal transmission from the first user gathering area to the second user gathering area:

[0204] (1) The RF transceiver circuit unit 32 is used to receive the ninth RF signal sent by the user terminal and preprocess the ninth RF signal. The fourth signal conversion unit 22 is used to convert the preprocessed ninth RF signal into a second analog optical signal and transmit the second analog optical signal to the first signal conversion unit 12 in the signal processing device 1. The first signal conversion unit 12 is used to receive the first analog optical signal, convert the first analog optical signal into a first RF signal, and transmit the first RF signal to the signal combining and splitting unit 11. The signal combining and splitting unit 11 is used to split the first RF signal to obtain a second RF signal and a third RF signal, send the second RF signal to the second signal conversion unit 13, and send the third RF signal to the third signal conversion unit 14.

[0205] (2) After receiving the second RF signal, the second signal conversion unit 13 converts the second RF signal into a second analog optical signal, and sends the second analog optical signal to the fourth signal conversion unit 22 in the multi-mode extension RF card 2. After receiving the second analog optical signal, the fourth signal conversion unit 22 converts the second analog optical signal into a fifth RF signal, and sends the fifth RF signal to the RF signal transceiver unit 21. After receiving the fifth RF signal, the RF signal transceiver unit 21 preprocesses the fifth RF signal to obtain a fourth RF signal, and sends the fourth RF signal to the RF signal remote device 3 in the base station A set in the third user area.

[0206] In the communication system, for the process of simultaneously transmitting the signal from the first user gathering area to the second user gathering area and the third user gathering area, you can refer to the above process and the above RF signal transceiver unit 21 to pre-process the sixth RF signal to obtain the seventh RF signal, which will not be repeated here.

[0207] In some possible embodiments, in a communication system, the multi-mode extension radio frequency card 2 is connected to the baseband processing unit 4 through the signal processing device 1 .

[0208] In implementation, the baseband processing unit 4 sends a management message to the multi-mode extension radio frequency card 2 through the signal processing device 1. After receiving the management message, the multi-mode extension radio frequency card 2 triggers the sending of an access status message to the baseband processing unit 4 through the signal processing device 1. Based on the access status message, the baseband processing unit 4 determines the current access status of the multi-mode extension radio frequency card 2 in the communication system.

[0209] The current access status includes completed access and incomplete access.

[0210] In this way, the access status of the multi-mode extension radio frequency card 2 can be determined by the baseband processing unit 4.

[0211] In some possible embodiments, as shown in FIG10 , a management channel is provided between the multi-mode expansion radio frequency card 2 and the baseband processing unit 4 in the communication system. The baseband processing unit 4 sends a management message to the multi-mode expansion radio frequency card 2 via the management channel. After receiving the management message, the multi-mode expansion radio frequency card 2 triggers the sending of an access status message to the baseband processing unit 4 via the management channel. Based on the access status message, the baseband processing unit 4 determines the current access status of the multi-mode expansion radio frequency card 2 in the communication system.

[0212] In this way, the baseband processing unit 4 can directly determine the access status of the multi-mode extension radio frequency card 2 through the management channel, thereby improving the efficiency of determining the access status of the multi-mode extension radio frequency card 2.

[0213] The above description is only one embodiment of the present disclosure and is not intended to limit the present disclosure. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present disclosure should be included in the scope of protection of the present disclosure.

Claims

1. A signal processing device (1), characterized in that: The signal processing device (1) comprises a signal combining and splitting unit (11) and a first signal conversion unit (12); The signal combining and splitting unit (11) is used to combine multiple radio frequency signals of different frequency bands to obtain a first radio frequency signal, wherein the multiple radio frequency signals of different frequency bands are respectively provided by a baseband processing unit (4) and a multi-mode expansion radio frequency card (2); The first signal conversion unit (12) is connected to the signal combining and splitting unit (11), and is used to convert the first radio frequency signal into a first analog optical signal, and transmit the first analog optical signal to the radio frequency signal remote device (3).

2. The signal processing device (1) according to claim 1, characterized in that The signal processing device (1) further comprises a second signal conversion unit (13); The second signal conversion unit (13) is connected to the signal combining and splitting unit (11) and the multi-mode expansion radio frequency card (2) respectively, and is used for receiving a second analog optical signal sent by the multi-mode expansion radio frequency card (2), converting the second analog optical signal into a second radio frequency signal, and transmitting the second radio frequency signal to the signal combining and splitting unit (11).

3. The signal processing device (1) according to claim 1, characterized in that The signal processing device (1) further comprises a third signal conversion unit (14); The third signal conversion unit (14) is respectively connected to the signal combining and splitting unit (11) and the baseband processing unit (4), and is used to receive the digital signal sent by the baseband processing unit (4), convert the digital signal into a third radio frequency signal, and transmit the third radio frequency signal to the signal combining and splitting unit (11).

4. The signal processing device (1) according to claim 3, characterized in that The third signal conversion unit (14) comprises a first preprocessing subunit (141) and a first signal conversion subunit (142); The first preprocessing subunit (141) is connected to the baseband processing unit (4), and is used to receive a first digital signal sent by the baseband processing unit (4), and preprocess the first digital signal to obtain a second digital signal; The first signal conversion subunit (142) is respectively connected to the first preprocessing subunit (141) and the signal combining and splitting unit (11), and is used to convert the second digital signal into the third radio frequency signal, and transmit the third radio frequency signal to the signal combining and splitting unit (11).

5. The signal processing device (1) according to claim 1, characterized in that The signal processing device (1) further comprises a first distribution unit (15); The first distribution unit (15) is connected to the first signal conversion unit (12) and is used to distribute and transmit the first analog optical signal to a plurality of radio frequency signal remote devices (3).

6. A multi-mode expansion radio frequency card (2), characterized in that: The multi-mode expansion radio frequency card (2) comprises a radio frequency signal transceiver unit (21) and a fourth signal conversion unit (22); The radio frequency signal transceiver unit (21) is used to receive a fourth radio frequency signal, and pre-process the fourth radio frequency signal to obtain a fifth radio frequency signal; The fourth signal conversion unit (22) is connected to the radio frequency signal transceiver unit (21), and is used to convert the fifth radio frequency signal into a second analog optical signal, and transmit the second analog optical signal to the signal processing device (1).

7. The multi-mode expansion radio frequency card (2) according to claim 6, characterized in that: The fourth signal conversion unit (22) comprises a combining and splitting subunit (221) and a second signal conversion subunit (222); The radio frequency signal transceiver unit (21) is further used to receive a sixth radio frequency signal, and pre-process the sixth radio frequency signal to obtain a seventh radio frequency signal; The combining and splitting subunit (221) is connected to the radio frequency signal transceiver unit (21) and is used for combining the fifth radio frequency signal and the seventh radio frequency signal to obtain an eighth radio frequency signal; The second signal conversion subunit (222) is connected to the combining and decombining subunit (221), and is used for converting the eighth radio frequency signal into a second analog optical signal, and transmitting the second analog optical signal to the signal processing device (1).

8. The multi-mode expansion radio frequency card (2) according to claim 6, characterized in that: The multi-mode expansion radio frequency card (2) further comprises a second distribution unit (23); The second distribution unit (23) is connected to the fourth signal conversion unit (22) and is used for distributing and transmitting the second analog optical signal to a plurality of signal processing devices (1).

9. A radio frequency signal extension device (3), characterized in that: The radio frequency signal remote device (3) comprises a fifth signal conversion unit (31) and a radio frequency transceiver circuit unit (32); The fifth signal conversion unit (31) is used to receive the first analog optical signal sent by the signal processing device (1), and convert the first analog optical signal into a ninth radio frequency signal; The radio frequency transceiver circuit unit (32) is used for transmitting the ninth radio frequency signal.

10. A communication system, characterized in that: The communication system comprises a signal processing device (1) as described in any one of claims 3 to 5, a multi-mode expansion radio frequency card (2) as described in any one of claims 6 to 8, a radio frequency signal remote device (3) as described in claim 9, and a baseband processing unit (4).

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