Channel port expansion circuit and base station system
The channel to be expanded in the remote control radio frequency unit into multiple expansion channels through the channel port expansion circuit, and networking is carried out based on these expansion channels and direct connection channels, solving the problem of high base station construction costs and realizing the effect of reducing base station construction costs.
Patent Information
- Application Number
- CN202311394263.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2023-10-25
- Publication Date
- 2025-04-25
AI Technical Summary
The existing base station system is costly during construction, especially because it is necessary to use multiple remote control radio frequency units to form a 3×2TR network, resulting in increased construction costs.
By providing a channel port expansion circuit, the channels to be expanded in the remote control radio frequency unit are expanded into multiple expansion channels, and networked based on these expansion channels and direct connection channels, reducing the dependence on multiple remote control radio frequency units.
This solution effectively reduces the cost of base station construction and avoids the need to use multiple remote control radio frequency units to achieve the networking of multiple sectors, thereby improving construction efficiency and economicality.
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Figure CN119893760A_ABST
Abstract
Description
Technical Field
[0001] The embodiments of the present application relate to the field of mobile communication technology, and in particular to a channel port expansion circuit and a base station system. Background Art
[0002] With the development of mobile communication systems, the requirements for base station construction are becoming higher and higher. In the current base station system, taking 3 sectors as an example, 3 2TR (2 transmit 2 receive) macro base stations are usually used to form a 3×2TR network for wide area coverage.
[0003] However, the networking mode of three 2TR macro base stations requires the use of three 2TR RRUs (Remote Radio Units), which increases the cost of base station construction. Summary of the invention
[0004] The main purpose of the embodiments of the present application is to provide a channel port expansion circuit and a base station system, aiming to reduce the cost of base station construction.
[0005] To achieve the above-mentioned purpose, an embodiment of the present application provides a channel port expansion circuit, wherein a first channel port of the channel port expansion circuit is connected to a remote control radio frequency unit, and a second channel port of the channel port expansion circuit is connected to an antenna feed unit. The channel port expansion circuit is used to expand the channel to be expanded in the remote control radio frequency unit into multiple expansion channels, and to perform networking based on the expansion channels and the direct connection channels in the remote control radio frequency unit.
[0006] In some embodiments, the channel port expansion circuit includes a transceiver expansion circuit, the first channel port of the channel port expansion circuit includes a first direct channel port and a to-be-expanded channel port, and the second channel port of the channel port expansion circuit includes a second direct channel port and an expanded channel port; wherein the number of ports of the second direct channel port is equal to the number of ports of the expanded channel port;
[0007] The first direct channel port is connected to the second direct channel port and the direct channel respectively, the to-be-expanded channel port is connected to the to-be-expanded channel, and the to-be-expanded channel port is connected to the extended channel port through the transceiver expansion circuit.
[0008] In addition, to achieve the above-mentioned purpose, an embodiment of the present application also provides a base station system, which includes: a remote control RF unit, an antenna feed unit, and a channel port expansion circuit as described above connected to the remote control RF unit and the antenna feed unit, wherein the channel port expansion circuit is used to expand the channel to be expanded in the remote control RF unit into multiple extended channels, and to perform networking based on the extended channels and the direct connection channels in the remote control RF unit.
[0009] The embodiment of the present application proposes a channel port expansion circuit and a base station system, wherein the first channel port of the channel port expansion circuit is connected to a remote control radio frequency unit, the second channel port of the channel port expansion circuit is connected to an antenna feed unit, and the channel port expansion circuit is used to expand the channel to be expanded in the remote control radio frequency unit into multiple expansion channels, and to network based on the expansion channel and the direct connection channel in the remote control radio frequency unit. The embodiment of the present application expands the channel to be expanded in the remote control radio frequency unit into multiple expansion channels through the channel port expansion circuit, and then networks based on the expansion channel and the direct connection channel in the remote control radio frequency unit, which can effectively avoid the need to use three 2TR (2 transmit and 2 receive) macro base stations to form a 3×2TR network for wide area coverage. By networking based on the expansion channel and the direct connection channel in the remote control radio frequency unit, there is no need to use multiple remote control radio frequency units to achieve multiple sector networking, thereby reducing the cost of base station construction. BRIEF DESCRIPTION OF THE DRAWINGS
[0010] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only part of the embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.
[0011] Figure 1 A schematic diagram of the structure of a base station system provided in one embodiment of the present application;
[0012] Figure 2 A schematic diagram of the structure of a base station system provided in yet another embodiment of the present application;
[0013] Figure 3 A schematic diagram of an internal expansion framework of a channel port expansion circuit provided in one embodiment of the present application;
[0014] Figure 4 A schematic diagram of an external interface of a channel port expansion circuit provided in one embodiment of the present application;
[0015] Figure 5 A schematic diagram of the connection of a transceiver expansion circuit in a channel port expansion circuit provided in an embodiment of the present application;
[0016] Figure 6 A schematic diagram of a framework for the expansion of traditional channel ports;
[0017] Figure 7 Another framework diagram for expanding the traditional channel port.
[0018] Description of Figure Numbers:
[0019] Label name Label name 100 Channel port expansion circuit 200 Remote control radio unit 220 Channels to be expanded 210 Direct Channel 110 Expansion Channel 11 Transceiver expansion circuit C1 Control chip K1 First control switch K2 Second control switch 10 First transceiver combiner 20 Receive combiner 30 Low Noise Amplifier 41 Second transceiver combiner 1 42 Second transceiver combiner 2 43 Second transceiver combiner 3 300 Antenna unit DETAILED DESCRIPTION
[0020] In the following description, specific details such as specific system structures, technologies, etc. are proposed for the purpose of illustration rather than limitation, so as to provide a thorough understanding of the embodiments of the present application. However, it should be clear to those skilled in the art that the embodiments of the present application can also be implemented in other embodiments without these specific details. In other cases, detailed descriptions of well-known systems, devices, circuits, and methods are omitted to prevent unnecessary details from hindering the description of the embodiments of the present application.
[0021] It should be noted that although a logical order is shown in the flowchart, in some cases, the steps shown or described may be performed in a different order than that in the flowchart. The terms "first", "second", etc. in the specification, claims and the above drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence.
[0022] It should also be understood that the references to "one embodiment" or "some embodiments" described in the specification of the embodiments of the present application mean that one or more embodiments of the embodiments of the present application include specific features, structures or characteristics described in conjunction with the embodiment. Thus, the statements "in one embodiment", "in some embodiments", "in some other embodiments", "in some other embodiments", etc. that appear in different places in this specification do not necessarily refer to the same embodiment, but mean "one or more but not all embodiments", unless otherwise specifically emphasized in other ways. The terms "including", "comprising", "having" and their variations all mean "including but not limited to", unless otherwise specifically emphasized in other ways.
[0023] With the development of mobile communication systems, rural 4 / 5G coverage has also become a hot topic. In order to reduce site costs, three 2TR macro base stations are usually used to form a 3x2TR network for wide area coverage. However, this solution requires three base stations, resulting in high overall costs. In order to reduce costs, the following two solutions are usually used:
[0024] 1. Use a 4TR base station and two dual-channel wide-lobe directional antennas to change the traditional 3-sector to 2-sector networking. However, this solution has coverage holes. If you want to solve the hole problem, you must change the current cellular networking method, which will cause the network load of the entire coverage area, which is not conducive to cell coordination and is susceptible to interference between neighboring cells.
[0025] 2. Use a 4TR base station and four omnidirectional antennas to form an omnidirectional station network. However, this solution is susceptible to interference from neighboring cells, the omnidirectional antenna has low gain, small coverage, increased site density, and increased overall cost of continuous coverage.
[0026] Based on the above problems, the channel port expansion circuit of the present embodiment is proposed. The channel to be expanded in the remote control radio frequency unit is expanded into multiple extended channels through the channel port expansion circuit, and then networking is performed based on the extended channels and the direct connection channels in the remote control radio frequency unit, thereby solving the problem of high cost of base station construction.
[0027] The channel port expansion circuit and base station system provided in the embodiments of the present application are specifically described by the following embodiments. Figure 1 , Figure 1 A schematic diagram of the structure of a base station system provided in one embodiment of the present application is shown in FIG. Figure 1 As shown, the base station system provided in this embodiment includes:
[0028] A remote control RF unit 200, an antenna unit 300, and a channel port expansion circuit 100 connected to the remote control RF unit 200 and the antenna unit 300, wherein the channel port expansion circuit 100 is used to expand the to-be-expanded channel 220 in the remote control RF unit 200 into a plurality of expansion channels 110, and to form a network based on the expansion channel 110 and the direct connection channel 210 in the remote control RF unit 200.
[0029] As an example, the antenna feed unit includes:
[0030] A plurality of directional antennas, each of which is connected to one of the extension channels 110 and one of the direct connection channels 210 .
[0031] like Figure 1 As shown, the first channel port of the channel port expansion circuit 100 provided in this embodiment is connected to the remote control RF unit 200, and the second channel port of the channel port expansion circuit 100 is connected to the antenna unit 300. The channel port expansion circuit 100 is used to expand the to-be-expanded channel 220 in the remote control RF unit 200 into multiple expansion channels 110, and to perform networking based on the expansion channels 110 and the direct connection channels 210 in the remote control RF unit 200.
[0032] Based on the traditional networking method that requires three base stations, the solution of this embodiment is proposed, through a base station system, including a remote control radio frequency unit 200, an antenna unit 300, and a channel port expansion circuit 100 connected to the remote control radio frequency unit 200 and the antenna unit 300, and then the channel port expansion circuit 100 is used to expand the to-be-expanded channel 220 in the remote control radio frequency unit 200 into multiple expansion channels 110, and the network is formed based on the expansion channels 110 and the direct connection channels 210 in the remote control radio frequency unit 200. In this way, signal coverage in areas with less business volume, such as rural areas, can be achieved, thereby reducing the cost of building base stations.
[0033] As an example, see Figure 2 , Figure 2 A structural diagram of a base station system is provided for another embodiment of the present application. Taking the expansion of 4 channels to 6 channels as an example, the directional antennas S1-S3 are respectively connected to one of the expansion channels 110 and the direct connection channel 210, and other antennas can also be used without limitation. Thus, a 4T4R RRU can be used to realize 3 2TR macro base stations to form a 3x2TR network, thereby reducing the use of RRUs and reducing the cost of base station construction.
[0034] In some feasible embodiments, the channel port expansion circuit 100 includes a transceiver expansion circuit 11, the first channel port of the channel port expansion circuit 100 includes a first direct channel port and a to-be-expanded channel port, and the second channel port of the channel port expansion circuit 100 includes a second direct channel port and an extended channel port; wherein the number of ports of the second direct channel port is equal to the number of ports of the extended channel port;
[0035] The first direct channel port is connected to the second direct channel port and the direct channel 210 respectively, the to-be-expanded channel port is connected to the to-be-expanded channel 220 , and the to-be-expanded channel port is connected to the extended channel port via the transceiver expansion circuit 11 .
[0036] As an example, the channel port expansion circuit 100 can be arranged in an expansion box, referring to Figure 4 , Figure 4This is a schematic diagram of an external interface of a channel port expansion circuit provided in an embodiment of the present application. The figure is illustrated by a channel port expansion circuit 100 that expands 4 channels to 6 channels. It can also be other expansion boxes with different expansion numbers, which are not limited here. This embodiment is illustrated by an expansion box that expands 4 channels to 6 channels. The expansion box can use a metal box with IP65 (a protection level) grade to meet electromagnetic shielding and outdoor environment working conditions. The expansion box has 4 (ANT_A, ANT_B, ANT_C) RF input ports (i.e., the first channel port of the channel port expansion circuit 100), which can use a 4.3-10 (F) connector (DIN or N-type connector can also be used), and are respectively connected to the RRU (i.e., the remote control RF unit 200) of 4T4R through RF jumpers; there are 6 (ANT_1, ANT_2, ANT_3, ANT_4, ANT_5, ANT_6) RF output ports (i.e., the second channel port of the channel port expansion circuit 100), which can use a standard 4.3-10 (F) connector (standard DIN connector or N-type connector can also be used), and are respectively (also through RF jumpers) connected to the external antenna feed unit 300; there is a CTR interface, which can use a standard AISG connector. The expansion box can be connected to the AISG output port of the RRU through an AISG cable, and the real-time channel switching control command sent by the RRU is sent to the control chip C1 in the expansion box.
[0037] As an example, see Figure 3 , Figure 3 A schematic diagram of an internal expansion framework of a channel port expansion circuit provided in an embodiment of the present application, wherein inside the expansion box, the three connectors ANT_A, ANT_B, and ANT_C (i.e., the first direct channel port, corresponding to channels A, B, and C in the remote control RF unit 200 as direct channels) can be directly connected to the connectors ANT_1, ANT_2, and ANT_3 (i.e., the second direct channel port) through cables or PCB traces, and at this time, ANT_D (the channel port to be expanded, corresponding to channel D in the remote control RF unit 200) is connected to the expansion channel ports ANT_4, ANT_5, and ANT_6 through the transceiver expansion circuit 11, thereby completing the expansion of the base station antenna feed channel.
[0038] As an example, based on the above, a 4TR RRU is expanded to a 6TR RRU, and an 8TR RRU can also be expanded to a 12TR RRU to achieve a low-cost 3x4TR networking solution, and other expansion solutions are also possible.
[0039] In some feasible embodiments, the transceiver expansion circuit 11 includes a receiving circuit, a transmitting circuit, a first transceiver combiner 10 and a plurality of second transceiver combiners 40 ( Figure 5 41-43), the first end of the first transceiver combiner 10 is connected to the output end of the receiving circuit, the second end of the first transceiver combiner 10 is connected to the input end of the sending circuit, the combining end of the first transceiver combiner 10 is connected to the channel port to be expanded, the input end of the receiving circuit is respectively connected to the first end of each of the second transceiver combiners 40, the output end of the sending circuit is respectively connected to the second end of each of the second transceiver combiners 40, and the combining end of each of the second transceiver combiners 40 is respectively connected to one of the expanded channel ports.
[0040] In this embodiment, the transceiver expansion circuit 11 includes a receiving circuit, a transmitting circuit, a first transceiver combiner 10 and a plurality of second transceiver combiners 40. The use of the transceiver can ensure that the signal is not attenuated and the signal is stable. When the port is expanded, a receiving and transmitting separation module is used, and then the receiving channel is subjected to low-noise amplification processing (low-noise amplifier 30), which offsets the insertion loss caused by the transceiver separation module and the combining module in the circuit; this design ensures that when the entire channel is expanded, the receiving channel of the entire expansion unit is stable and reliable.
[0041] As an example, the second transceiver combiner 40 is designed to expand the channel to be expanded into multiple channels, and the number of channels to be expanded is determined by designing the number of the second transceiver combiners 40 .
[0042] As an example, there may be multiple first transceiver combiners 10. When there are multiple first transceiver combiners 10, multiple channels to be expanded are expanded into multiple expansion channels.
[0043] In some embodiments, the receiving circuit includes a low noise amplifier 30 and a receiving combiner 20, the input end of the low noise amplifier 30 is connected to the first end of each of the second transceiver combiners 40, the output end of the low noise amplifier 30 is connected to the input end of the receiving combiner 20, and the output end of the receiving combiner 20 is connected to the first end of the first transceiver combiner 10.
[0044] The transmitting circuit includes a control chip C1 and a plurality of control switches K ( Figure 5The input end of the control chip C1 is connected to the first channel port, the output end of the control chip C1 is connected to the control end of each of the control switches K, the sending output end of each of the control switches K is respectively connected to the second end of the second transceiver combiner 40, and the first end of the first control switch is connected to the second end of the first transceiver combiner 10; wherein the second end of the control switch is connected to the first end of the adjacent control switch, and the sending output end includes the third end of each of the control switches and the second end of the last control switch.
[0045] The number of the transmission output ports is equal to the number of the extension channel ports.
[0046] The first channel port of the channel port expansion circuit further includes a control port, and the control port is connected to the input end of the control chip C1 and the remote control radio frequency unit 200 respectively.
[0047] As an example, see Figure 5 , Figure 5 This is a connection diagram of a transceiver expansion circuit in a channel port expansion circuit provided in an embodiment of the present application, taking the expansion of 4 channels to 6 channels as an example. Figure 5 In the figure, the first transceiver combiner 10, the second transceiver combiner 141, the second transceiver combiner 242, and the second transceiver combiner 343 are dual-frequency combiners. The first transceiver combiner 10 is used to complete the separation of receiving and transmitting; the second transceiver combiner 141, the second transceiver combiner 242, and the second transceiver combiner 343 are used for transceiver combining, and after combining the receiving and transmitting, a total of 3 TR antenna feed interfaces are formed. The receiving combiner 20 is a 3-port combiner that combines the receiving channels from 3 antennas into one channel. The low noise amplifier 30 is a low noise amplification module that performs low noise amplification on the receiving channels of the 3 channels respectively to compensate for the insertion loss of the receiving channels in the entire module. In specific applications, internal devices can also be added or deleted according to the number of expanded channels.
[0048] As an example, the first control switch K1 and the second control switch K2 are high-power, high-speed RF single-pole double-throw switches, which realize the design of 1 input and 3 output transmission channels; in the specific implementation, 1 switch can be used to realize 1 input and 2 outputs, which can be extended to: using n switches to realize n input n+1 output and other designs, thereby realizing different channel expansions.
[0049] As an example, the control chip C1 is a control unit, which completes the control of the first control switch K1 and the second control switch K2 according to the scheduling of the baseband, so that the transmission signal of the ANT_D port is switched back and forth after the three antenna feeds ANT4, ANT5, and ANT6 according to business requirements, ensuring that the base station transmission signal is output to the corresponding antenna feed port at the correct time without loss. Taking advantage of the inherent characteristics of low traffic volume in rural macro coverage scenarios, high-power RF high-speed switches are used in the transmission channel. Between the transmission channels of the three sectors, uS-level switching can be performed according to the business characteristics of the cell, thereby realizing channel expansion. In order to ensure the communication between the extension unit and the base station, the interface adopts the AISG standard interface, and the NSBT interface can also be used. For example, switching or reasonable allocation is performed according to the number of signals. In this way, the cost of base station construction can be reduced while ensuring the business needs of the scenario.
[0050] Based on the above expansion circuit composition, refer to Figure 6 , Figure 6 This is a schematic diagram of the framework of the traditional channel port expansion. This solution will cause the power of the corresponding cell to be reduced (1-to-2 design, coverage power is reduced by 3db+, coverage radius is reduced by 30%; 1-to-3 design, coverage power is reduced by 4.8db, coverage radius is reduced by 42%). This solution will lead to low network speed and poor experience for edge users of the network, which will reduce network performance overall. Figure 7 , Figure 7 This is another framework diagram of traditional channel port expansion, using mechanical switches for channel expansion. However, when this solution is performing channel reuse, only one cell in the coverage area is a 2T2R network, and the other two cells degenerate into 1T1R. After degenerating into 1T1R, the edge coverage of the network becomes poor, which is not friendly to edge users, especially affecting the user uplink experience. At the same time, the mechanical switch switches slowly and the number of switches is limited. In order to ensure its long-term reliable operation, channel switching can only be performed at the hour level.
[0051] In some embodiments, the second direct-connect channel port includes a plurality of antenna direct-connect ports, the extended channel port includes a plurality of antenna extended ports, and each of the antenna direct-connect ports is networked with one of the antenna extended ports.
[0052] As an example, after 4 channels are expanded to 6 channels, the expanded receiving and transmitting channels are combined into 3 TR ports through a customized broadband combining unit, and connected to the antennas and feeders of 3 cells respectively, thus meeting the low-service, low-cost macro network coverage requirements in rural areas.
[0053] As an example, take ANT_D in the expansion of 4 channels to 6 channels as an example, ANT_D is expanded into three ports, namely ANT4, ANT5, and ANT6. Taking 4G cell configuration as an example, the signal flow of this embodiment is described in detail.
[0054] The ANT_A port of the 4TR base station and ANT4 form a 2TRS1 sector; when the 4G broadcast signal is sent, Port0 is configured on ANT_A, and when the auxiliary signal is sent, Port1 is configured on ANT_4.
[0055] The ANT_B port of the 4TR base station and ANT5 form a 2TRS2 sector; when the 4G broadcast signal is sent, Port0 is configured on ANT_B, and when the auxiliary signal is sent, Port1 is configured on ANT_5.
[0056] The ANT_C port of the 4TR base station and ANT6 form a 2TRS3 sector. When the 4G broadcast signal is sent, Port0 is configured on ANT_C, and when the auxiliary signal is sent, Port1 is configured on ANT_6. The coverage power of the three sectors S1, S2, and S3 is the same as the output power of the 4TR base station port, ensuring that their coverage remains unchanged.
[0057] As an example, the antenna direct connection port is networked with one antenna extension port respectively, or one antenna direct connection port is networked with multiple antenna extension ports. The antenna direct connection port is a port of the 4TR base station directly connected to the antenna feed unit 300, and the antenna extension port is a port of the 4TR base station connected to the antenna feed unit 300 after expansion. The antenna direct connection port and the antenna extension port can also be other networking methods, such as networking of ports after direct expansion, which is not limited here.
[0058] As an example, combining Figure 4 and Figure 2 The entire control is described as follows:
[0059] a. When there is a service request in the S1 sector, K1 selects a1-c1, and the channel from ANT_D to ANT4 is opened. The downlink service data of the terminal users in the S1 sector is sent to the antenna of the S1 sector from ANT_A, ANT_D to ANT3 through the antenna, and transmitted to the corresponding users in the S1 sector; the uplink data of the users in the S1 sector is sent to the base station from ANT_A after being received by the corresponding antenna, and sent to the base station from ANT4-the second transceiver combiner 141-the low noise amplifier 30-the receiving combiner 20-the first transceiver combiner 10-ANT_D through the ANT_D port. In the base station, the service processing of the users in the S1 sector is completed.
[0060] b. When the S2 sector has a service request, K1 selects a1-b1 and K2 selects a2-c2, and the channel from ANT_D to ANT5 is opened. The downlink service data of the terminal users of the S2 sector is sent to the antenna of the S2 sector from ANT_B, ANT_D to ANT5 through the antenna, and transmitted to the corresponding users of the S2 sector; the uplink data of the users of the S2 sector is sent to the base station from ANT_B after being received by the corresponding antenna, and sent to the base station from ANT5-the second transceiver combiner 242-the low noise amplifier 30-the receiving combiner 20-the first transceiver combiner 10-ANT_D through the ANT_D port. In the base station, the service processing of the users of the S2 sector is completed.
[0061] c. When the S3 sector has a service request, K1 selects a1-b1, and K2 selects a2-b2, and the channel from ANT_D to ANT6 is opened. The downlink service data of the terminal users of the S3 sector is sent to the antenna of the S3 sector from ANT_C, ANT_D to ANT6 through the antenna, and transmitted to the corresponding users of the S3 sector; the uplink data of the users of the S3 sector is received by the corresponding antenna, and sent to the base station from ANT_C, and sent to the base station from ANT6-the second transceiver combiner 343-low noise amplifier 30-receiving combiner 20-the first transceiver combiner 10-ANT_D through the ANT_D port. In the base station, the service processing of the users of the S2 sector is completed. In this way, the service control sending and receiving is realized, and the base station construction cost can be reduced by applying the channel port expansion circuit 100 while ensuring the base station function.
[0062] The above is a specific description of the preferred implementation of the embodiments of the present application, but the embodiments of the present application are not limited to the above-mentioned implementation methods. Technical personnel familiar with the field can also make various equivalent modifications or substitutions without violating the spirit of the embodiments of the present application. These equivalent modifications or substitutions are all included in the scope defined by the claims of the embodiments of the present application.
Claims
1. A channel port expansion circuit, characterized in that: The first channel port of the channel port expansion circuit is connected to the remote control radio frequency unit, and the second channel port of the channel port expansion circuit is connected to the antenna feed unit. The channel port expansion circuit is used to expand the to-be-expanded channel in the remote control radio frequency unit into multiple extended channels, and to perform networking based on the extended channels and the direct connection channels in the remote control radio frequency unit.
2. The channel port expansion circuit according to claim 1, characterized in that: The channel port expansion circuit includes a transceiver expansion circuit, the first channel port of the channel port expansion circuit includes a first direct channel port and a to-be-expanded channel port, and the second channel port of the channel port expansion circuit includes a second direct channel port and an expanded channel port; wherein the number of ports of the second direct channel port is equal to the number of ports of the expanded channel port; The first direct channel port is connected to the second direct channel port and the direct channel respectively, the to-be-expanded channel port is connected to the to-be-expanded channel, and the to-be-expanded channel port is connected to the extended channel port through the transceiver expansion circuit.
3. The channel port expansion circuit according to claim 2, characterized in that: The transceiver expansion circuit includes a receiving circuit, a transmitting circuit, a first transceiver combiner and a plurality of second transceiver combiners, wherein the first end of the first transceiver combiner is connected to the output end of the receiving circuit, the second end of the first transceiver combiner is connected to the input end of the transmitting circuit, the combining end of the first transceiver combiner is connected to the channel port to be expanded, the input end of the receiving circuit is respectively connected to the first end of each of the second transceiver combiners, the output end of the transmitting circuit is respectively connected to the second end of each of the second transceiver combiners, and the combining end of each of the second transceiver combiners is respectively connected to one of the expanded channel ports.
4. The channel port expansion circuit according to claim 3, characterized in that: The receiving circuit includes a low noise amplifier and a receiving combiner, the input end of the low noise amplifier is connected to the first end of each of the second transceiver combiners, the output end of the low noise amplifier is connected to the input end of the receiving combiner, and the output end of the receiving combiner is connected to the first end of the first transceiver combiner.
5. The channel port expansion circuit according to claim 3, characterized in that: The transmitting circuit includes a control chip and a plurality of control switches connected in series in sequence, wherein the input end of the control chip is connected to the first channel port, the output end of the control chip is connected to the control end of each of the control switches, the transmitting output end of each of the control switches is respectively connected to the second end of one of the second transceiver combiners, and the first end of the first control switch is connected to the second end of the first transceiver combiner; wherein the second end of the control switch is connected to the first end of the adjacent control switch, and the transmitting output end includes the third end of each of the control switches and the second end of the last control switch.
6. The channel port expansion circuit according to claim 5, characterized in that: The number of the transmission output ports is equal to the number of the extension channel ports.
7. The channel port expansion circuit according to claim 5, characterized in that: The first channel port of the channel port expansion circuit also includes a control port, and the control port is respectively connected to the input end of the control chip and the remote control radio frequency unit.
8. The channel port expansion circuit according to any one of claims 2 to 7, characterized in that: The second direct-connection channel port includes a plurality of antenna direct-connection ports, the extended channel port includes a plurality of antenna extension ports, and each of the antenna direct-connection ports is networked with one of the antenna extension ports.
9. A base station system, characterized in that: The base station system includes: a remote control radio frequency unit, an antenna feed unit, and a channel port expansion circuit according to any one of claims 1 to 8 connected to the remote control radio frequency unit and the antenna feed unit, wherein the channel port expansion circuit is used to expand the to-be-expanded channel in the remote control radio frequency unit into multiple extended channels, and to perform networking based on the extended channels and the directly connected channels in the remote control radio frequency unit.
10. The base station system according to claim 9, characterized in that: The antenna feed unit comprises: A plurality of directional antennas, each of the directional antennas is connected to one of the extension channels and one of the direct connection channels respectively.