A 5G-R base station network system

Abstract

The present invention discloses a 5G‑R base station network system, which is a 5G‑R base station system redundancy solution in the case of a single leaky cable. It is of great significance for ensuring the communication reliability in the case of a single leaky cable in a tunnel of any length in a train-controlled section and a tunnel of a non-train-controlled section with a length greater than or equal to 3 kilometers. It can guide the research and development, system testing and engineering construction of 5G‑R system base station equipment; moreover, it can not only overcome single-point equipment failures, but also provide communication services when some multi-point failures occur; in addition, in addition to overcoming failures to ensure the normal operation of railways, it is also convenient for the 5G‑R system to implement planned maintenance operations such as maintenance and upgrading, as well as engineering construction such as renovation and transformation, without affecting the system capacity and wireless signal level.

Description

Technical Field

[0001] The present invention relates to the field of 5G private network technology, and in particular to a 5G-R base station network system. Background Art

[0002] The railway 5G dedicated mobile communication (5G-R) system will enable the intelligent and smart development of China's railways. The services carried by the 5G-R system include train command and control and operation and maintenance applications. Among them, train command and control includes CTCS-3 level train control, ATO automatic driving, locomotive synchronous control and other applications, which have high reliability requirements for the 5G-R system. Single point failures of the 5G-R system should not affect the information transmission of the above applications.

[0003] There are a large number of tunnels on my country's railways. According to the construction principles of the GSM-R system (railway integrated digital mobile communication system), the CTCS-3 train operation control section and the locomotive synchronous control section should be designed with redundant wireless coverage as needed, including tunnel sections of any length; for lines with single base station coverage (non-redundant coverage), for tunnels with a length greater than or equal to 3 kilometers, dedicated mobile communication systems are required to consider redundant wireless coverage measures to avoid the impact of single-point equipment failures on communications due to the inability to repair them in a timely manner.

[0004] The 5G-R system will use distributed base stations combined with leaky coaxial cables (referred to as "leaky cables") for wireless coverage in tunnels. If two leaky cables can be laid to achieve MIMO (multiple-input, multiple-output), it will be beneficial to improve the system throughput in the tunnel, ensure more or higher-speed business needs, and ensure the reliability of the system. However, because there are many cables in the tunnel, the leaky cable must not only meet the hanging height requirements, but also meet the safety protection distance requirements between the high and low voltage cables. These restrictions may result in only one leaky cable being laid in the tunnel. At the same time, considering the limitations of construction investment and other factors, only one leaky cable may be allowed to be laid. This poses a challenge to the reliability of the base station system when the 5G-R base station RRU (radio remote unit) equipment only supports full machine backup and does not allow the channel bandwidth to be split to ensure system capacity.

[0005] GSM-R systems generally lay a single leaky cable. In this case, the redundancy of the base station system is mainly achieved by connecting the base station to the repeater, using the same-site dual base station or single base station interleaving method. The specific implementation plan is as follows:

[0006] (1) In the dual-base station solution at the same site, the two base stations are connected to the repeater respectively. The two sets of repeaters at the same site are configured with different frequencies. The leaky cables on both sides are connected by a bridge. The two sets of repeaters can work at the same time. When a single base station or repeater fails, the other set of repeaters at the same site can provide services.

[0007] (2) In the single-base station interleaving scheme, the distance between repeaters is increased. Repeaters are generally equipped with three optical modules, which are connected to two adjacent base stations respectively. The master and backup optical modules are connected to the master base station, and the slave module is connected to the slave base station. To ensure reasonable switching, the master-slave signal difference of the repeater is controlled by adjusting the repeater gain or adding attenuators. That is, the signals of two base stations are introduced into a single set of repeaters at the same time. When the master base station fails, the signal of the slave base station is used. When a single set of repeaters fails, because the distance between repeaters is increased, the repeaters on both sides of the failed repeater can still achieve seamless coverage through leaky cables.

[0008] However, in the above two solutions: in solution (1), when a set of repeaters fails or is out of service, the system capacity will be reduced; in solution (2), when a set of repeaters fails or is out of service, the wireless signal level will be reduced and the ability to overcome interference will be reduced. Therefore, it is necessary to develop new solutions to ensure that the network can still effectively provide communication services when a failure occurs. Summary of the invention

[0009] The purpose of the present invention is to provide a 5G-R base station network system, which can not only overcome single-point equipment failures, but also enable the network to effectively provide communication services when some multi-point failures occur.

[0010] The objective of the present invention is achieved through the following technical solutions:

[0011] A 5G-R base station network system is applied to the case of laying a single leaky cable in a tunnel. The system structure includes:

[0012] Two sets of RRUs are set at the same site, and the two sets of RRUs are connected to the leaky cable through a bridge; two sets of BBUs are set at different sites, and the two sets of BBUs are set as active and standby, and are connected through redundant heartbeat lines; RRU stands for radio remote unit, and BBU stands for baseband unit; BBU and RRU are connected through an optical fiber ring, and the two sets of RRUs and two sets of BBUs at the same site are connected one-to-one through an optical fiber ring;

[0013] Each BBU exchanges data with the core network through the NG interface. Leaky cables are deployed between RRUs in the tunnel section to radiate wireless signals and achieve communication with user equipment. BBU achieves frequency and time synchronization through the global navigation satellite system and the ground bearer network.

[0014] When a fault occurs, the dual BBU active-standby switching is triggered. In the case of maintenance, upgrade, or renovation, the dual BBU active-standby switching is suspended and the maintenance, upgrade, or renovation is performed in sequence. Among them, the fault types include: single-point equipment failure and some multi-point failures.

[0015] It can be seen from the technical solution provided by the present invention that a 5G-R base station system redundancy solution is provided in the case of a single leaky cable, which is of great significance for ensuring the communication reliability in the case of a single leaky cable in a tunnel of any length in the train control section and a tunnel of a non-train control section with a length greater than or equal to 3 kilometers. It can guide the research and development, system testing and engineering construction of 5G-R system base station equipment; moreover, it can not only overcome single-point equipment failures, but also avoid the problems existing in the aforementioned method (1) and solution (2) when some multi-point failures occur, thereby effectively providing communication services; in addition, in addition to overcoming failures to ensure the normal operation of the railway, it is also convenient for the 5G-R system to implement planned maintenance operations such as maintenance and upgrading, as well as engineering construction such as renovation and transformation. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

[0017] Figure 1 A schematic diagram of a 5G-R base station network system provided for an embodiment of the present invention. DETAILED DESCRIPTION

[0018] The following is a clear and complete description of the technical solutions in the embodiments of the present invention in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the protection scope of the present invention.

[0019] First, the terms that may be used in this article are explained as follows:

[0020] The term “and / or” means that either or both of them can be realized at the same time. For example, X and / or Y means both “X” or “Y” and “X and Y”.

[0021] The terms "include", "comprises", "contains", "has" or other descriptions with similar semantics should be interpreted as non-exclusive inclusion. For example, including certain technical feature elements (such as raw materials, components, ingredients, carriers, dosage forms, materials, dimensions, parts, components, mechanisms, devices, steps, procedures, methods, reaction conditions, processing conditions, parameters, algorithms, signals, data, products or products, etc.) should be interpreted as including not only certain technical feature elements explicitly listed, but also other technical feature elements known in the art that are not explicitly listed.

[0022] The term "consisting of..." means excluding any technical feature elements not explicitly listed. If this term is used in a claim, it will make the claim closed, so that it does not contain technical feature elements other than the technical feature elements explicitly listed, except for the conventional impurities related to them. If this term only appears in a clause of a claim, it only limits the elements explicitly listed in the clause, and the elements recorded in other clauses are not excluded from the overall claim.

[0023] Unless otherwise specified or limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example: it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this article can be understood according to specific circumstances.

[0024] A 5G-R base station network system provided by the present invention is described in detail below. The contents not described in detail in the embodiments of the present invention belong to the prior art known to professional and technical personnel in the field. If no specific conditions are specified in the embodiments of the present invention, they shall be carried out in accordance with the conventional conditions in the field or the conditions recommended by the manufacturer. The instruments used in the embodiments of the present invention, if the manufacturer is not specified, are all conventional products that can be purchased commercially.

[0025] The current 5G-R system technical solution research is to implement a base station redundancy setting scheme considering MIMO by laying two leaky cables in the tunnel, which includes setting up two sets of RRUs at the same site to work simultaneously. When the actual situation in the tunnel only has the conditions for laying one leaky cable, or when only one leaky cable is allowed to be laid due to investment restrictions, because the 5G-R base station RRU equipment only supports whole-machine backup, in order to ensure system capacity, the 5G-R system channel bandwidth is not allowed to be split and used, resulting in the base station redundancy setting scheme for dual leaky cables no longer being applicable. Therefore, an embodiment of the present invention provides a 5G-R base station system redundancy solution when a single leaky cable is laid in a tunnel.

[0026] A 5G-R base station network system provided in an embodiment of the present invention can be directly combined with an existing 5G-R system. The 5G-R system includes a core network and a wireless access network, wherein the wireless access network includes a gNB (5G base station) and a leaky cable. The wireless access network uses a gNB+antenna or a gNB+leaky cable to achieve strip wireless coverage along the railway. The gNB adopts a distributed architecture, including a baseband unit (BBU) and a radio remote unit (RRU). The BBU and the RRU are connected by an optical cable. One BBU can be used to pull multiple RRUs, and the RRU can be pulled up to a distance of up to 20km. The BBU and the RRU communicate through the common public radio interface (CPRI), and the BBU interacts with the core network through the NG interface for data. In the tunnel section, leaky cables are deployed between the RRUs, and wireless signals are radiated through the leaky cables to achieve communication with the user equipment (UE). BBU achieves frequency synchronization and time synchronization through GNSS (Global Navigation Satellite System) and the ground bearer network. When the external synchronization source is lost, the internal clock of the BBU device can play a role, and the frequency retention time is not less than 30 days. The carrier frequency accuracy of the output signal meets the system requirements. The master clock autonomously synchronizes time for not less than 24 hours, and the time accuracy meets the system requirements.

[0027] In the case of laying a single leaky cable in a tunnel, in order to achieve reliable communication, the 5G-R base station network system provided by the embodiment of the present invention mainly includes: two sets of RRUs are set at the same site, and the two sets of RRUs are connected to the leaky cable through a bridge; two sets of BBUs are set at different sites, and the two sets of BBUs are set as master and standby, and are connected through redundant heartbeat connections; RRU stands for radio remote unit, and BBU stands for baseband unit; BBU and RRU are connected through an optical fiber ring, and the two sets of RRUs and two sets of BBUs at the same site are connected one-to-one with each other through an optical fiber ring; each BBU is connected through an NG interface (A logical interface, which is the interface between the wireless access network and the 5G core network) interacts with the core network for data exchange, deploys leaky cables between RRUs in tunnel sections, radiates wireless signals through the leaky cables, and realizes communication with user equipment. BBU realizes frequency synchronization and time synchronization through the global navigation satellite system and the ground bearer network; when a fault occurs, the dual BBU active-standby switching is triggered, and in the case of maintenance, upgrade, or renovation, the dual BBU active-standby switching is suspended, and maintenance, upgrade, or renovation is performed in sequence; among them, the fault types include: single-point equipment failure and some multi-point failures.

[0028] For ease of understanding, the present invention is further introduced below from three aspects: system structure, parameter configuration, and working mechanism under different circumstances.

[0029] 1. System structure.

[0030] Figure 1 An example of the main structure of the above-mentioned 5G-R base station network system is provided, wherein:

[0031] (1) There are six groups of dual RRUs, namely RRU1 and RRU2, RRU3 and RRU4, RRU5 and RRU6, RRU7 and RRU8, RRU9 and RRU10, and RRU11 and RRU12. Each group is set at the same site.

[0032] (2) The two sets of BBUs are set up at different sites, and the redundant heartbeat connection is realized through optical fiber connection or bearer network connection.

[0033] (3) The component categories in the BBU include: baseband processing unit, main control and transmission unit, and power module. All components are redundantly configured. When a component fails, it is switched to a normal component of the same type to work. Figure 1 An example is provided in which each BBU is configured with 4 baseband processing units, 2 main control and transmission units, and a power module. In actual applications, the number of each component can be set according to the situation.

[0034] (4) The BBU and RRU are connected via an optical fiber ring. The two RRUs at the same location are connected to each BBU via different optical fiber rings. Figure 1 As shown, each RRU in the co-located dual RRU is connected to a separate set of BBUs (e.g., RRU1 is connected to BBU1, and RRU2 is connected to BBU2). Figure 1 ①) and ring tail (such as Figure 1 ④) connects different baseband processing units in the BBU. Figure 1 An example is provided in which each BBU is connected to two RRU rings and each ring is provided with three RRUs. In actual applications, it is not limited to the case where each BBU is connected to one or three or more RRU rings and each RRU ring is provided with two or four or more RRUs.

[0035] (5) The optical cables between the two sets of BBUs and the associated RRUs (i.e., the RRUs connected to each BBU) are laid using different paths.

[0036] (6) The bridge is a four-port passive device, two ports of which are connected to two sets of RRUs at the same location, and the other two ports are connected to the leakage cables on both sides. When the bridge is located at the tunnel entrance, one of the other two ports is connected to the leakage cable on one side, and the remaining port is installed with a load.

[0037] (7) When two sets of RRUs at the same site are located at the tunnel entrance, each RRU uses the remaining RF port to connect to the antenna while connecting to the leaky cable to provide wireless coverage of the space area outside the tunnel. Figure 1 An example is provided in which RRU1, RRU2, RRU11 and RRU12 are located at the tunnel entrance. Figure 1The connection method between the RRU and the antenna is not provided, and the connection method can be flexibly selected according to the actual project situation.

[0038] (8) The dual BBUs are fully connected to the AMF (access and mobility management function) and UPF (user plane function) of the core network.

[0039] 2. Parameter configuration.

[0040] (1) The two sets of BBUs and their connected RRUs are configured with different base station names, cell names and different NCGIs (NR cell global identifiers), but with the same wireless parameters, such as the RRU's transmit power and PCI (physical cell identifier).

[0041] (2) Two sets of RRUs at the same site are defined as a location group. When cell merging is used between different location groups, the cell name, NCGI and PCI parameters used for cell splitting are configured.

[0042] (3) Heartbeat detection is supported between the active and standby BBUs. The protocol used for heartbeat detection can be flexibly selected, the interval for sending heartbeat detection packets can be configured, and the number of times the detection packet is sent before determining that the heartbeat is lost can be configured.

[0043] (4) The fault detection time before the active / standby BBU switchover is configurable.

[0044] 3. Working mechanisms in different situations.

[0045] 1. Under normal circumstances, the working mechanism of the system.

[0046] (1) Both BBUs and all RRUs are powered on, and the active BBU and the RRUs connected to it are responsible for communication services. The parameters of the standby BBU and its RRUs (i.e., the connected RRUs) are configured, and the standby RRUs do not transmit signals to avoid interference within the network.

[0047] (2) To ensure system capacity, both the primary and backup parts operate according to the full 5G-R channel bandwidth without bandwidth segmentation.

[0048] (3) The two sets of RRUs at different sites are different location groups. Different location groups can adopt different cell or cell merging working modes.

[0049] (4) The optical fiber ring between the BBU and the RRU. The data transmission between the BBU and the RRU is only responsible for the ring head, or the ring head and the ring tail are responsible for data transmission at the same time. When the ring head and the ring tail are responsible for data transmission at the same time, the communication between the RRU and the BBU on the optical fiber ring adopts the principle of proximity.

[0050] 2. Working mechanism under fault conditions.

[0051] In order to avoid the impact of single-point failures on communications, and to consider the impact of some multi-point failures on communications, when a failure occurs, the dual BBU active-standby switching is triggered, and the standby BBU and the RRU connected to the standby BBU take on the communication business. Specifically:

[0052] (1) The preset active RRU at each site fails or loses power, triggering a switchover between the active and standby BBUs. The 5G-R base station name contains a number, and the odd-numbered or even-numbered RRU can be set as the active RRU.

[0053] (2) All CPRI ports of the preset active RRU at each site fail, triggering a switchover between the active and standby BBUs.

[0054] (3) The active BBU fails or loses power, triggering a switchover between the active and standby BBUs.

[0055] (4) When the NG interface of the active BBU works in active / standby mode, if the active NG interface fails, the active / standby BBU switchover is triggered. When the NG interface of the active BBU works in load sharing mode, if one NG interface fails, the other NG interface will take over all services without triggering the active / standby BBU switchover.

[0056] (5) The active BBU synchronization signal is lost, and the active / standby BBU switchover is not triggered.

[0057] (6) When both the redundant heartbeats between the active and standby BBUs fail, if the failure is caused by a bearer network failure and occurs on the active BBU side, the active and standby BBU switching is triggered. If the failure is caused by a bearer network failure and occurs on the standby BBU side, the active and standby BBU switching is not triggered. If a single heartbeat fails between the active and standby BBUs, the active and standby BBU switching is not triggered.

[0058] (7) A component in the active BBU fails, and the redundant component switching time is longer than the switching time between the active and standby BBUs. Specifically: When the active BBU component (the various modules mentioned above) fails, a switching should be triggered based on the switching time of the redundant component switching and the switching between the active and standby BBUs. The switching time of any switching should not be longer than the switching time between the active and standby BBUs.

[0059] (8) The fiber ring head and tail of a main RRU on the main BBU side are both faulty (e.g. Figure 1 ① and ④) trigger the active / standby BBU switchover.

[0060] (9) If both RRUs at any node fail or lose power, the active / standby BBU switchover will not be triggered.

[0061] (10) If all CPRI ports of the dual RRUs at any node fail, the active / standby BBU switchover will not be triggered.

[0062] (11) Figure 1 Take the optical fiber ring composed of RRU1, RRU3, RRU5 and BBU1 as an example, assuming that the optical fiber ring is in the active state, when the optical fiber at any point ①, ②, ③, ④ fails, the active-standby BBU switching will not be triggered, the communication from the breakpoint to the ring head will not be affected, and the communication from the breakpoint to the ring tail will be handled by the baseband processing unit connected to the ring tail. If the RRUs on the optical fiber ring adopt the cell merging working mode under normal circumstances, they will be split into two cells with the breakpoint as the boundary.

[0063] In the embodiment of the present invention, the switching time of the primary and standby BBUs should meet the wireless timeout time requirement allowed by the application service system, and the switching time includes the time of fault detection. After the fault is recovered, it is supported to restore the working state manually.

[0064] 3. System working mechanism during maintenance, upgrade, or renovation.

[0065] (1) When maintenance or upgrade is required, the switching mechanism between the active and standby BBUs is suspended at the window point, and maintenance or upgrade operations are carried out on the standby BBU and the RRUs connected to it. After the test is normal and it runs stably for a specified period of time as specified, the active BBU and the RRUs connected to it are suspended from carrying out communication services at the window point and maintenance or upgrade operations are carried out on them, and the standby BBU and the RRUs connected to it are started to carry out communication services.

[0066] (2) During the update and renovation, the switching mechanism between the active and standby BBUs is suspended at the window point, and the standby BBU and the RRUs connected to it are updated and renovated. When the update and renovation is completed and the conditions for opening are met, the active BBU and the RRUs connected to it are suspended from carrying communication services at the window point and are updated and renovated. The standby BBU and the RRUs connected to it are started to carry communication services after the update and renovation.

[0067] The above solution of the embodiment of the present invention mainly achieves the following beneficial effects:

[0068] (1) The present invention is of great significance for ensuring the communication reliability of a single leaky cable in a tunnel of any length in the train-controlled section and in a tunnel of a non-train-controlled section with a length greater than or equal to 3 kilometers. It can guide the research and development of 5G-R system base station equipment, system testing and engineering construction.

[0069] (2) The present invention can not only overcome single-point device failures, but also enable the network to still provide communication services when some multi-point failures occur.

[0070] (3) In addition to overcoming faults and ensuring normal railway operation, the present invention also facilitates the planned maintenance and upgrading of the 5G-R system and other maintenance operations, as well as renovation and reconstruction engineering construction, without affecting the system capacity and wireless signal level.

[0071] The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed in the present invention should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A 5G-R base station network system, characterized in that: When used for laying a single leaky cable in a tunnel, the system structure includes: Two sets of RRUs are set at the same site, and the two sets of RRUs are connected to the leaky cable through a bridge; two sets of BBUs are set at different sites, and the two sets of BBUs are set as master and backup, and are connected through redundant heartbeat lines; RRU stands for radio remote unit, and BBU stands for baseband unit; BBU and RRU are connected through an optical fiber ring, and the two sets of RRUs and two sets of BBUs at the same site are connected one-to-one through an optical fiber ring, that is, each RRU in the two sets of RRUs at the same site is connected to a set of BBU separately; Each BBU exchanges data with the core network through the NG interface. Leaky cables are deployed between RRUs in the tunnel section to radiate wireless signals and achieve communication with user equipment. BBU achieves frequency and time synchronization through the global navigation satellite system and the ground bearer network. When a fault occurs, the dual BBU active-standby switching is triggered. In the case of maintenance, upgrade, or renovation, the dual BBU active-standby switching is suspended and the maintenance, upgrade, or renovation is performed in sequence. Among them, the fault types include: single-point equipment failure and some multi-point failures.

2. A 5G-R base station network system according to claim 1, characterized in that: The redundant heartbeat connection between the two sets of BBUs set up at different sites is realized through optical fiber connection or through bearer network connection.

3. A 5G-R base station network system according to claim 1, characterized in that: The component categories in the BBU include: baseband processing unit, main control and transmission unit, and power module. All components are redundantly configured. When a component fails, it is switched to a normal component of the same type to work.

4. A 5G-R base station network system according to claim 1, characterized in that: The bridge is a four-port passive device, two ports of which are connected to two sets of RRUs at the same location, and the other two ports are connected to the leaky cables on both sides. When the bridge is located at the tunnel entrance, one of the other two ports is connected to the leaky cable on one side, and the remaining port is installed with a load.

5. A 5G-R base station network system according to claim 1, characterized in that: When two sets of RRUs at the same site are located at the tunnel entrance, each RRU uses the remaining RF port to connect to the antenna while connecting to the leaky cable, providing wireless coverage for the space outside the tunnel.

6. A 5G-R base station network system according to claim 1, characterized in that: In the system, the two sets of BBUs and the RRUs connected to them are configured with different base station names, cell names and different NCGIs, and the same wireless parameters; the two sets of RRUs at the same site are defined as a location group. When the cell merging working mode is adopted between different location groups, the cell name, NCGI and PCI parameters used for cell splitting are configured.

7. A 5G-R base station network system according to claim 1, characterized in that: Under normal circumstances, the system's working mechanisms include: The two BBUs and all RRUs are powered on, and the active BBU and the RRUs connected to the active BBU are responsible for communication services and operate according to the full 5G-R channel bandwidth; The two sets of RRUs at different sites are different location groups, and different location groups can adopt different cell or cell merging working modes; The optical fiber ring between BBU and RRU, the data transmission between BBU and RRU is only responsible for the ring head, or the ring head and the ring tail are responsible for it at the same time. When the ring head and the ring tail are responsible for data transmission at the same time, the communication between RRU and BBU on the optical fiber ring adopts the principle of proximity.

8. A 5G-R base station network system according to claim 1, characterized in that: When a fault occurs, the dual BBU active-standby switching is triggered, and the standby BBU and the RRU connected to the standby BBU take on communication services and operate according to the full 5G-R channel bandwidth.

9. A 5G-R base station network system according to claim 8, characterized in that: When a fault occurs, the following situations trigger the active / standby switchover of the two BBUs: The preset main RRU at each site fails or loses power; All CPRI ports of the preset active RRU at each site are faulty; among them, the GPRI port is a public wireless interface, which is used to connect to the BBU; The main BBU fails or loses power; When the NG interface of the active BBU is in active / standby working mode, the active NG interface fails; The redundant heartbeat between the active and standby BBUs fails. When the failure is caused by a bearer network failure and occurs on the active BBU side; A component in the active BBU fails, and the switching time of the redundant component is longer than the switching time between the active and standby BBUs; All CPRI ports of a certain active RRU optical ring on the active BBU side are faulty.

10. A 5G-R base station network system according to claim 1, characterized in that: When undergoing maintenance, upgrading, or renovation, the system adopts the following working mechanism: When maintenance or upgrade is required, the switching mechanism between the active and standby BBUs is suspended at the window point, and maintenance or upgrade operations are carried out on the standby BBU and the RRU connected to it. After the test is normal and the stable operation is specified for a period of time, the active BBU and the RRU connected to it are suspended from carrying out communication services at the window point and maintenance or upgrade operations are carried out on them, and the standby BBU and the RRU connected to it are started to carry out communication services; During the update and renovation, the switching mechanism between the active and standby BBUs is suspended at the window point, and the standby BBU and the RRU connected to it are updated and renovated. When the update and renovation is completed and the conditions for opening are met, the active BBU and the RRU connected to it are suspended at the window point to carry out communication services and are updated and renovated. The updated standby BBU and the RRU connected to it are started to carry out communication services.

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