CN114374437A - CRAN-based forward transmission architecture and construction method thereof - Google Patents
CRAN-based forward transmission architecture and construction method thereof Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/25—Arrangements specific to fibre transmission
- H04B10/2575—Radio-over-fibre, e.g. radio frequency signal modulated onto an optical carrier
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/25—Arrangements specific to fibre transmission
- H04B10/2575—Radio-over-fibre, e.g. radio frequency signal modulated onto an optical carrier
- H04B10/25752—Optical arrangements for wireless networks
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/25—Arrangements specific to fibre transmission
- H04B10/2575—Radio-over-fibre, e.g. radio frequency signal modulated onto an optical carrier
- H04B10/25752—Optical arrangements for wireless networks
- H04B10/25753—Distribution optical network, e.g. between a base station and a plurality of remote units
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J14/00—Optical multiplex systems
- H04J14/02—Wavelength-division multiplex systems
- H04J14/0201—Add-and-drop multiplexing
- H04J14/0202—Arrangements therefor
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
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Abstract
The embodiment of the invention relates to the technical field of wireless communication, and discloses a CRAN-based forward architecture and a construction method thereof, wherein the forward architecture comprises the following steps: the system comprises a base station, a plurality of trunk optical intersections, a node machine room and a communication optical cable arranged between the base station and the trunk optical intersections or between the base station and the node machine room, wherein the plurality of trunk optical intersections form a full-service optical cable which is connected with the node machine room; and forming a main route and a standby route between the base station and the node computer room based on the communication optical cable and the full-service optical cable by taking a computer room grid as a unit. Through the mode, the embodiment of the invention can meet CRAN networking architectures in different areas, save optical fiber resources, improve network security and ensure network reliability.
Description
Technical Field
The embodiment of the invention relates to the technical field of wireless communication, in particular to a CRAN-based forward transmission architecture and a construction method thereof.
Background
The Radio access network of 5G will evolve from a baseband processing Unit (BBU) and a Remote Radio Unit (RRU) two-level structure of a 4G/Long Term Evolution (LTE) network to a Centralized Unit (CU), a Distributed Unit (DU) and an active antenna processing Unit (AAU) three-level structure. CU and DU are deployed in two different ways, a way of separately deploying CU and DU is called a Centralized Radio Access Network (CRAN), and a way of deploying CU and DU in a combined manner is called a distributed radio Access Network (drain). Wherein, forward transmission is performed between AAU and DU, intermediate transmission is performed between DU and CU, and return transmission is performed above CU.
The traditional CRAN forward transmission adopts a mode of optical fiber direct connection, namely, a DU and each AAU port all adopt point-to-point direct connection networking. The optical cable branch chain scheme is simple to implement, but occupies more optical fiber resources, and causes troubles to areas with insufficient optical cable resources; meanwhile, due to the star network architecture, the protection performance of the network is poor, and the service fallback rate caused by the fault of the wireless service access layer is 100%.
Disclosure of Invention
In view of the foregoing problems, embodiments of the present invention provide a CRAN-based fronthaul architecture and a method for constructing the same, which overcome or at least partially solve the above problems.
According to an aspect of an embodiment of the present invention, a forwarding architecture based on a CRAN is provided, where the forwarding architecture includes: the system comprises a base station, a plurality of trunk optical intersections, a node machine room and a communication optical cable arranged between the base station and the trunk optical intersections or between the base station and the node machine room, wherein the plurality of trunk optical intersections form a full-service optical cable which is connected with the node machine room; and forming a main route and a standby route between the base station and the node computer room based on the communication optical cable and the full-service optical cable by taking a computer room grid as a unit.
In an optional manner, a machine room grid is taken as a unit, and for different resource conditions, different active routes and standby routes are formed between the base station and the node machine room based on the communication optical cable and the full-service optical cable.
In an optional manner, with a machine room grid as a unit, for a resource-sufficient area, the primary route is that the base station directly reaches the node machine room by using the communication optical cable network resource; the standby route comprises a communication optical cable and full-service optical cable resources, wherein the communication optical cable is used for optical communication between the base station and the trunk.
In an optional mode, a machine room grid is taken as a unit, and aiming at an area with less resource shortage, the main route comprises a communication optical cable and full-service optical cable resources, wherein the communication optical cable is used for optical communication between a first base station in the grid and a nearby trunk; the standby route comprises a communication optical cable and full-service optical cable resources, wherein the communication optical cable is used for optical communication between the last base station in the grid and the trunk.
In an optional mode, a machine room grid is taken as a unit, and the main route comprises a communication optical cable and a full-service optical cable for optical communication between a base station and a nearby trunk aiming at an area with serious insufficient resources; the standby route comprises a reverse route of the same communication optical cable and the full-service optical cable.
In an optional manner, the forwarding architecture further includes a DU-side color light module, a first wavelength division multiplexer, a local machine room device, a remote site device, a second wavelength division multiplexer, and an AAU-side color light module, the first optical interface of the local machine room equipment is connected with the common port of the first wavelength division multiplexer, the second optical interface and the third optical interface of the office machine room equipment are respectively connected with the active route and the standby route, the first wavelength division multiplexer is provided with a plurality of communication wavelet ports which are connected with a plurality of DU side color light modules through single-core optical fibers and double-core optical fibers, two branch interfaces of the far-end network point device are respectively connected with the main route and the standby route, the trunk interface of the far-end network point equipment is connected with the public port of the second wavelength division multiplexer, and a plurality of communication wavelet ports on the second wavelength division multiplexer are connected with a plurality of AAU color light modules through single-core optical fibers and double-core optical fibers.
In an optional manner, the office room device includes a 1X2 optical switch, which is an active device.
In an alternative, the far-end mesh point device includes a coupler, the coupler being a passive device, in accordance with 50: and (3) coupling the modes to form a 1: 1 protection mode.
According to another aspect of the embodiment of the invention, a method for constructing a forward-forwarding architecture based on CRAN is provided, and the method for constructing the forward-forwarding architecture based on CRAN comprises the following steps: arranging a communication optical cable and trunk optical intersections between a base station and a node machine room, wherein a plurality of trunk optical intersections form a full-service optical cable which is connected with the node machine room; and constructing a main route and a standby route between the base station and the node computer room based on the communication optical cable and the full-service optical cable by taking a computer room grid as a unit.
In an optional mode, a machine room grid is taken as a unit, and for a resource-sufficient area, the base station optical cable network resources are utilized to directly reach the node machine room to form the primary route, a base station is selected to newly build a communication optical cable for optical communication with a trunk, and the full-service optical cable resources are utilized to reach the node machine room to form the standby route; aiming at the area with less insufficient resources, selecting a first base station in the grid to newly build a communication optical cable which is in optical communication with a nearby trunk, and utilizing full-service optical cable resources to reach the node machine room to form the main route; selecting the last base station in the grid to newly build a communication optical cable for optical communication with the trunk, and utilizing full-service optical cable resources to reach the node machine room to form the standby route, wherein the middle base station does not need to build a communication optical cable again; aiming at the area with serious insufficient resources, a communication optical cable for optical communication between the base station and the nearby trunk is newly built, and a full-service optical cable is used for reaching the node machine room to form the main route; and the same communication optical cable and the full-service optical cable are used for reverse routing to reach the node computer room to form the standby route.
The forwarding architecture of the embodiment of the invention comprises the following components: the system comprises a base station, a plurality of trunk optical intersections, a node machine room and a communication optical cable arranged between the base station and the trunk optical intersections or between the base station and the node machine room, wherein the plurality of trunk optical intersections form a full-service optical cable which is connected with the node machine room; and forming a primary route and a standby route between the base station and the node computer room based on the communication optical cable and the full-service optical cable by taking a computer room grid as a unit, so that the CRAN networking architecture in different areas can be met, the optical fiber resources are saved, the network security is improved, and the network reliability is ensured.
The foregoing description is only an overview of the technical solutions of the embodiments of the present invention, and the embodiments of the present invention can be implemented according to the content of the description in order to make the technical means of the embodiments of the present invention more clearly understood, and the detailed description of the present invention is provided below in order to make the foregoing and other objects, features, and advantages of the embodiments of the present invention more clearly understandable.
Drawings
Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention. Also, like reference numerals are used to refer to like parts throughout the drawings. In the drawings:
fig. 1 is a schematic diagram illustrating a CRAN-based forwarding architecture provided by an embodiment of the present invention;
fig. 2 is a schematic diagram illustrating a CRAN-based forwarding architecture according to an embodiment of the present invention;
fig. 3 is a schematic diagram illustrating a CRAN-based forwarding architecture according to an embodiment of the present invention;
fig. 4 is a schematic diagram illustrating a CRAN-based forwarding architecture according to an embodiment of the present invention;
fig. 5 is a schematic diagram illustrating a method for constructing a CRAN-based fronthaul architecture according to an embodiment of the present invention.
Detailed Description
Exemplary embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the invention are shown in the drawings, it should be understood that the invention can be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.
Fig. 1 shows a schematic structural diagram of a CRAN-based fronthaul architecture provided by an embodiment of the present invention. As shown in fig. 1, the CRAN-based forwarding architecture includes: the system comprises a base station 1, a plurality of trunk optical intersections 2, a node machine room 3 and a communication optical cable 4 arranged between the base station 1 and the trunk optical intersections 2 or between the base station 1 and the node machine room 3, wherein the plurality of trunk optical intersections 2 form a ring-shaped full-service optical cable which is connected with the node machine room; and forming a main route and a standby route between the base station and the node computer room based on the communication optical cable and the full-service optical cable by taking a computer room grid as a unit.
In the embodiment of the invention, the CRAN-based forwarding architecture is applied to 5G communication. And forming different main routes and standby routes between the base station and the node computer room based on the communication optical cable and the full-service optical cable for different resource conditions by taking a computer room grid as a unit. Referring to fig. 1, by taking a machine room grid as a unit, forward transmission requirements are met by newly building a communication optical cable for a resource-sufficient area. Thus, the primary route is that the base station directly reaches the node machine room by using the communication optical cable network resource; the standby route comprises a communication optical cable and full-service optical cable resources of a base station and a trunk optical cross-connect 2. Referring to fig. 2, a machine room grid is taken as a unit, a communication optical cable is built for an area with less insufficient resources, and an optical cable between base stations is used for meeting the forward transmission requirement. Thus, the primary route comprises a communication optical cable and full-service optical cable resources of a first base station in the grid and a nearby trunk optical cross 2; the standby route comprises communication optical cables and full-service optical cable resources of the last base station in the grid and the trunk optical cross-connect 2. Referring to fig. 3, a machine room grid is taken as a unit, and for an area with serious resource shortage, a base station optical cable cannot be utilized, and a newly-built communication optical cable meets the forward transmission requirement. Thus, the main route comprises a communication optical cable and a full-service optical cable of the base station and the nearby trunk optical cross 2; the standby route comprises a reverse route of the same communication optical cable and the full-service optical cable.
The embodiment of the invention aims to meet the requirements of CRAN forward transmission stacking and cost reduction and efficiency improvement and meet the requirement of 5G rapid construction, creatively provides three scenes of a CRAN architecture, and utilizes base station optical cable network resources to construct a rapid, high-quality and safe 5G access network by taking a machine room grid as a unit; by newly building a communication optical cable, the full-service optical cable is fully utilized, the CRAN networking architecture in different areas is met, the main and standby routes form an annular structure, and the network security is improved.
As shown in fig. 4, the forwarding architecture further includes a DU-side color light module, a first wavelength division multiplexer, a local machine room device, a remote network point device, a second wavelength division multiplexer, and an AAU-side color light module, the first optical interface of the local machine room equipment is connected with the common port COM of the first wavelength division multiplexer, the second optical interface and the third optical interface of the office machine room equipment are respectively connected with the active route and the standby route, the first wavelength division multiplexer is provided with a plurality of communication wavelet ports which are connected with a plurality of DU side color light modules through single-core optical fibers and double-core optical fibers, two branch interfaces of the far-end network point device are respectively connected with the main route and the standby route, the trunk interface of the far-end network point equipment is connected with the common port COM of the second wavelength division multiplexer, and a plurality of communication wavelet ports on the second wavelength division multiplexer are connected with a plurality of AAU color light modules through single-core optical fibers and double-core optical fibers.
In the embodiment of the present invention, the office machine room device is disposed in the node machine room, the remote network point device is disposed in the base station, and the active route and the standby route respectively correspond to the active route and the standby route in fig. 1 to 3. The local computer room equipment and the far-end network point equipment are combined to form semi-active wavelength division equipment. The local machine room equipment comprises a 1X2 optical switch, and is active equipment. The far-end mesh point device comprises a coupler, the coupler is a passive device, and the distance between the coupler and the far-end mesh point device is as follows, 50: the 50 mode is coupled. The coupler adopts 2-core optical fiber transmission, 1 main fiber and 1 spare fiber, and forms a signal double-transmission mode 1: 1 protection mode. One communication wavelet port of the second wavelength division multiplexer corresponds to optical signals with two wavelengths, and the two optical signals are respectively used for transmitting signals to the DU side from the AAU side and transmitting signals to the AAU side from the DU side. The 1X2 optical switch is used for realizing the use switching of the active route and the standby route. A plurality of communication wavelet ports of the first wavelength division multiplexer are respectively connected with a plurality of DU side color light modules through single-core optical fibers and double-core optical fibers, so that independent communication transmission of the AAU side color light modules and the DU color light modules is achieved, the second wavelength division multiplexer carries out multiplexing on signals of the AAU side color light modules with different wavelengths to a single optical fiber, optical line coupling is carried out through a coupler, and 2 groups of transmission signals of a main route and a standby route are generated simultaneously.
According to the embodiment of the invention, three different novel CRAN architecture modes are adopted for different areas according to whether resources are sufficient or not, so that the CRAN fronthaul networking can be built in all the areas, the effects of saving resources and improving the network security are effectively achieved, and meanwhile, the single-route interruption can be realized without influencing the service by matching with semi-active wavelength division equipment.
The forwarding architecture of the embodiment of the invention comprises the following components: the system comprises a base station, a plurality of trunk optical intersections, a node machine room and a communication optical cable arranged between the base station and the trunk optical intersections or between the base station and the node machine room, wherein the plurality of trunk optical intersections form a full-service optical cable which is connected with the node machine room; and forming a primary route and a standby route between the base station and the node computer room based on the communication optical cable and the full-service optical cable by taking a computer room grid as a unit, so that the CRAN networking architecture in different areas can be met, the optical fiber resources are saved, the network security is improved, and the network reliability is ensured.
Fig. 5 is a schematic diagram illustrating a method for constructing a CRAN-based forwarding architecture according to an embodiment of the present invention. As shown in fig. 5, the method for constructing the forward architecture based on the CRAN includes:
step S11: and arranging a communication optical cable and trunk optical intersections between the base station and the node machine room, wherein a plurality of trunk optical intersections form a full-service optical cable which is connected with the node machine room.
Specifically, a communication optical cable may be arranged between the base station and the trunk optical cross or directly between the base station and the node machine room. Thus, the route that can be formed between the base station and the node computer room may be: the route formed by the communication optical cable directly arranged between the base station and the node machine room or the route formed by the communication optical cable between the base station and the main optical cross and the full-service optical cable.
Step S12: and constructing a main route and a standby route between the base station and the node computer room based on the communication optical cable and the full-service optical cable by taking a computer room grid as a unit.
And taking a machine room grid as a unit, and aiming at a resource-sufficient area, meeting the requirement of forward transmission by newly building a communication optical cable. Specifically, the base station optical cable network resources are used for directly reaching the node machine room to form the primary route, a base station is selected to newly build a communication optical cable which is in optical communication with the trunk, and the full-service optical cable resources are used for reaching the node machine room to form the standby route.
Aiming at the area with less insufficient resources, a communication optical cable is built, and the optical cable between base stations is utilized to meet the requirement of forward transmission. Specifically, a first base station in the grid is selected to newly build a communication optical cable for optical communication with a nearby trunk, and a full-service optical cable resource is utilized to reach the node machine room to form the primary route; and selecting the last base station in the grid to newly build a communication optical cable for optical communication with the trunk, and utilizing full-service optical cable resources to reach the node machine room to form the standby route, wherein the middle base station does not need to build the communication optical cable again.
Aiming at the area with serious insufficient resources, the base station optical cable cannot be utilized, and the newly-built communication optical cable meets the requirement of forward transmission. Specifically, a communication optical cable for optical communication between the base station and the nearby trunk is newly established, and a full-service optical cable is used for reaching the node machine room to form the primary route; and the same communication optical cable and the full-service optical cable are used for reverse routing to reach the node computer room to form the standby route.
The embodiment of the invention also carries out semi-active wavelength division, the local side machine room equipment is arranged in the node machine room, the far-end network point equipment is arranged in the base station, and the local side machine room equipment comprises a 1X2 optical switch and is active equipment. The far-end mesh point device comprises a coupler, the coupler is a passive device, and the distance between the coupler and the far-end mesh point device is as follows, 50: the 50 mode is coupled. The coupler adopts 2-core optical fiber transmission, 1 main fiber and 1 spare fiber, and forms a signal double-transmission mode 1: 1 protection mode. The primary route and the standby route in the former three scenes are applied for communication between the coupler and the 1X2 optical switch.
In the embodiment of the invention, a communication optical cable and trunk optical intersections are arranged between a base station and a node machine room, wherein a plurality of trunk optical intersections form a ring-shaped full-service optical cable which is connected with the node machine room; and constructing a main route and a standby route between the base station and the node computer room based on the communication optical cable and the full-service optical cable by taking a computer room grid as a unit, so that the CRAN networking architecture in different areas can be met, the optical fiber resource is saved, the network security is improved, and the network reliability is ensured.
In the description provided herein, numerous specific details are set forth. It is understood, however, that embodiments of the invention may be practiced without these specific details. In some instances, well-known methods, structures and techniques have not been shown in detail in order not to obscure an understanding of this description.
Similarly, it should be appreciated that in the foregoing description of exemplary embodiments of the invention, various features of the embodiments of the invention are sometimes grouped together in a single embodiment, figure, or description thereof for the purpose of streamlining the invention and aiding in the understanding of one or more of the various inventive aspects. However, the disclosed method should not be interpreted as reflecting an intention that: that the invention as claimed requires more features than are expressly recited in each claim.
Those skilled in the art will appreciate that the modules in the device in an embodiment may be adaptively changed and disposed in one or more devices different from the embodiment. The modules or units or components of the embodiments may be combined into one module or unit or component, and furthermore they may be divided into a plurality of sub-modules or sub-units or sub-components. All of the features disclosed in this specification (including any accompanying claims, abstract and drawings), and all of the processes or elements of any method or apparatus so disclosed, may be combined in any combination, except combinations where at least some of such features and/or processes or elements are mutually exclusive. Each feature disclosed in this specification (including any accompanying claims, abstract and drawings) may be replaced by alternative features serving the same, equivalent or similar purpose, unless expressly stated otherwise.
It should be noted that the above-mentioned embodiments illustrate rather than limit the invention, and that those skilled in the art will be able to design alternative embodiments without departing from the scope of the appended claims. In the claims, any reference signs placed between parentheses shall not be construed as limiting the claim. The word "comprising" does not exclude the presence of elements or steps not listed in a claim. The word "a" or "an" preceding an element does not exclude the presence of a plurality of such elements. The invention may be implemented by means of hardware comprising several distinct elements, and by means of a suitably programmed computer. In the unit claims enumerating several means, several of these means may be embodied by one and the same item of hardware. The usage of the words first, second and third, etcetera do not indicate any ordering. These words may be interpreted as names. The steps in the above embodiments should not be construed as limiting the order of execution unless specified otherwise.
Claims (10)
1. A CRAN-based forwarding architecture, the forwarding architecture comprising: the system comprises a base station, a plurality of trunk optical intersections, a node machine room and a communication optical cable arranged between the base station and the trunk optical intersections or between the base station and the node machine room, wherein the plurality of trunk optical intersections form a full-service optical cable which is connected with the node machine room; and forming a main route and a standby route between the base station and the node computer room based on the communication optical cable and the full-service optical cable by taking a computer room grid as a unit.
2. The forwarding architecture of claim 1, wherein different active routes and standby routes are formed between the base station and the node room based on the communication optical cable and the full-service optical cable for different resource situations in units of a room grid.
3. The forwarding architecture of claim 2, wherein, in terms of a machine room grid as a unit, for a resource-sufficient area, the primary route is that the base station directly reaches the node machine room by using the communication optical cable network resource; the standby route comprises a communication optical cable and full-service optical cable resources, wherein the communication optical cable is used for optical communication between the base station and the trunk.
4. The forwarding architecture of claim 2, wherein the primary route includes a communication cable and a full service cable resource for a first base station in a machine room grid to intersect with a nearby trunk light for a region with less resource shortage; the standby route comprises a communication optical cable and full-service optical cable resources, wherein the communication optical cable is used for optical communication between the last base station in the grid and the trunk.
5. The forwarding architecture of claim 2, wherein the primary route includes a communication optical cable and a full service optical cable for optical communication between a base station and a nearby trunk for a region with severely insufficient resources in a unit of a machine room grid; the standby route comprises a reverse route of the same communication optical cable and the full-service optical cable.
6. The fronthaul architecture according to claim 1, further comprising a DU-side color light module, a first wavelength division multiplexer, a local machine room device, a remote site device, a second wavelength division multiplexer, and an AAU-side color light module, wherein a first optical interface of the local machine room device is connected to a common port of the first wavelength division multiplexer, a second optical interface and a third optical interface of the local machine room device are respectively connected to the primary route and the backup route, the first wavelength division multiplexer is provided with a plurality of communication wavelet ports connected to the DU-side color light modules through single-core optical fibers and dual-core optical fibers, two branch interfaces of the remote site device are respectively connected to the primary route and the backup route, and a main interface of the remote site device is connected to a common port of the second wavelength division multiplexer, and a plurality of communication wavelet ports on the second wavelength division multiplexer are connected with a plurality of AAU color light modules through single-core optical fibers and double-core optical fibers.
7. The forwarding architecture of claim 6, wherein the office room equipment comprises a 1X2 optical switch, which is an active device.
8. The fronthaul architecture of claim 6, wherein the remote mesh point device comprises a coupler, the coupler being a passive device, in accordance with a 50: and (3) coupling the modes to form a 1: 1 protection mode.
9. A construction method of a CRAN-based forwarding architecture is characterized by comprising the following steps:
arranging a communication optical cable and trunk optical intersections between a base station and a node machine room, wherein a plurality of trunk optical intersections form a full-service optical cable which is connected with the node machine room;
and constructing a main route and a standby route between the base station and the node computer room based on the communication optical cable and the full-service optical cable by taking a computer room grid as a unit.
10. The method according to claim 9, wherein the constructing the primary route and the backup route between the base station and the node room based on the communication optical cable and the full-service optical cable in units of a room grid comprises:
taking a machine room grid as a unit, aiming at a resource sufficient area, directly reaching the node machine room by utilizing the base station optical cable network resource to form the primary route, selecting a base station to newly establish a communication optical cable for optical communication with a trunk, and reaching the node machine room by utilizing a full-service optical cable resource to form the standby route;
aiming at the area with less insufficient resources, selecting a first base station in the grid to newly build a communication optical cable which is in optical communication with a nearby trunk, and utilizing full-service optical cable resources to reach the node machine room to form the main route; selecting the last base station in the grid to newly build a communication optical cable for optical communication with the trunk, and utilizing full-service optical cable resources to reach the node machine room to form the standby route, wherein the middle base station does not need to build a communication optical cable again;
aiming at the area with serious insufficient resources, a communication optical cable for optical communication between the base station and the nearby trunk is newly built, and a full-service optical cable is used for reaching the node machine room to form the main route; and the same communication optical cable and the full-service optical cable are used for reverse routing to reach the node computer room to form the standby route.
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