CN111083808B - Base station system based on wavelength division multiplexing, data transmission method and storage medium - Google Patents
Base station system based on wavelength division multiplexing, data transmission method and storage medium Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
- H04W88/08—Access point devices
- H04W88/10—Access point devices adapted for operation in multiple networks, e.g. multi-mode access points
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- H—ELECTRICITY
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- 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
- H04J—MULTIPLEX COMMUNICATION
- H04J14/00—Optical multiplex systems
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Abstract
The application relates to a base station system based on wavelength division multiplexing, a data transmission method and a storage medium. The base station system based on wavelength division multiplexing comprises a baseband unit, a first optical wave demultiplexing device and a second optical wave demultiplexing device which are connected in sequence; the system also comprises each far-end radio frequency unit connected with the second optical wave demultiplexing device; when the baseband unit receives downlink data of each network system transmitted by the core network, a corresponding data channel is adopted to modulate the corresponding downlink data into downlink optical signals, and each downlink optical signal is transmitted to the first optical wave demultiplexing device; the first optical wave demultiplexing device combines each downlink optical signal into a downlink composite optical wave and transmits the downlink composite optical wave to the second optical wave demultiplexing device; the second optical wave demultiplexing device decomposes the downlink composite optical wave into downlink optical waves and transmits the downlink optical waves to a remote radio frequency unit working in a corresponding network mode respectively; the BBU production cost and maintenance cost can be greatly reduced.
Description
Technical Field
The present invention relates to the field of communications technologies, and in particular, to a base station system based on wavelength division multiplexing, a data transmission method, and a storage medium.
Background
In the communication field, common Base station forms include an integrated small Base station, a BBU (Base Band Unit), a RRU (Radio Remote Unit, remote radio Unit) distributed Base station and a BBU+SW+RRU distributed Base station, and Base station systems with different forms have different application scenes and use advantages. In the field of 5G NSA (Non-independent networking) networking, a relatively common base station system is that a core network is connected with a 4G BBU, the 4G BBU is connected with a 4G RRU in a downlink manner, the core network is connected with the 5G BBU, and the 5G BBU is connected with the 5G RRU in a downlink manner, that is, the 4G base station BBU and the 5G base station BBU are integrated into the core network through independent channels.
However, in the implementation process, the inventor finds that at least the following problems exist in the conventional technology: the traditional networking mode greatly wastes BBU resources and optical fiber resources.
Disclosure of Invention
In view of the above, it is desirable to provide a base station system, a data transmission method, and a storage medium based on wavelength division multiplexing, which can reduce cost and save resources.
In order to achieve the above object, in one aspect, an embodiment of the present invention provides a base station system based on wavelength division multiplexing, including a baseband unit, a first optical wave demultiplexing device, and a second optical wave demultiplexing device that are sequentially connected; the system also comprises remote radio frequency units respectively connected with the second optical wave demultiplexing device;
when the baseband unit receives downlink data of each network system transmitted by the core network, a corresponding data channel is adopted to modulate the corresponding downlink data into downlink optical signals, and each downlink optical signal is transmitted to the first optical wave demultiplexing device; the first optical wave demultiplexing device combines each downlink optical signal into a downlink composite optical wave and transmits the downlink composite optical wave to the second optical wave demultiplexing device; the second optical wave demultiplexing device decomposes the downlink composite optical wave into downlink optical waves and transmits the downlink optical waves to a remote radio frequency unit working in a corresponding network mode respectively;
when the second optical wave demultiplexing device receives the corresponding network type uplink data transmitted by each remote radio frequency unit, coupling each uplink data, and transmitting the obtained coupling uplink data to the first optical wave demultiplexing device; the first optical wave demultiplexing device decomposes the coupled uplink data into uplink optical waves and transmits the uplink optical waves to the baseband unit based on corresponding data channels.
In one embodiment, each network system includes a 4G network system and a 5G network system;
the first optical wave de-multiplexing device is a combiner; the second optical wave demultiplexing device is a demultiplexer.
In one embodiment, the remote radio unit includes at least two;
one of the remote radio units is a 4G network RRU, and the other remote radio unit is a 5G network RRU.
In one embodiment, the baseband unit includes a first optical port, a first optical module, a second optical port, and a second optical module;
one end of the first optical port is connected with the first optical wave demultiplexing device, and the other end of the first optical port is connected with the first optical module; the first optical module modulates the 4G network type downlink data transmitted by the core network into a downlink optical signal with a first wavelength;
one end of the second optical port is connected with the first optical wave demultiplexing device, and the other end of the second optical port is connected with the second optical module; the second optical module modulates the 5G network type downlink data transmitted by the core network into a downlink optical signal with a second wavelength;
wherein the first wavelength and the second wavelength are different.
In one embodiment, the first optical wave demultiplexing device is coupled to the second optical wave demultiplexing device by a single fiber bi-directional assembly.
In one embodiment, the second optical wave demultiplexing device is connected to each remote radio frequency unit in a one-to-one correspondence through each optical fiber.
In one embodiment, the baseband units are connected to the core network by optical fibers.
On the other hand, the embodiment of the invention also provides a data transmission method, which comprises downlink data transmission and uplink data transmission;
the downlink data transmission includes the steps of:
when receiving downlink data of each network system transmitted by a core network, modulating the corresponding downlink data into downlink optical signals by adopting a corresponding data channel, and transmitting each downlink optical signal to a first optical wave demultiplexing device;
each downlink optical signal is used for indicating the first optical wave demultiplexing device to transmit the downlink composite optical wave obtained by combining to the second optical wave demultiplexing device; the downlink composite light wave is used for indicating the second light wave demultiplexing device to transmit each downlink light wave obtained by decomposition to a remote radio frequency unit working in a corresponding network mode respectively;
the uplink data transmission includes the steps of:
receiving each uplink light wave transmitted by the first light wave demultiplexing device based on a corresponding data channel; each uplink light wave is the coupling uplink data transmitted by the second light wave demultiplexing device and is obtained by decomposing the coupling uplink data by the first light wave demultiplexing device; the coupling uplink data are obtained by coupling corresponding network type uplink data transmitted by each remote radio frequency unit through a second optical wave demultiplexing device.
In one embodiment, each network downlink data includes IQ data of a 4G network and IQ data of a 5G network;
the step of modulating the corresponding downlink data into a downlink optical signal by adopting the corresponding data channel comprises the following steps:
modulating the IQ data of the 4G network system into a downlink optical signal of a first wavelength;
modulating the IQ data of the 5G network system into a downlink optical signal of a second wavelength;
wherein the first wavelength and the second wavelength are different.
A computer readable storage medium having stored thereon a computer program which when executed by a processor performs the steps of any of the methods described above.
One of the above technical solutions has the following advantages and beneficial effects:
the application provides a base station NSA networking mode based on wavelength division multiplexing; the BBU (i.e. the baseband unit) can process uplink and downlink baseband data of each network system (e.g. 4G and 5G) in real time, so that the production cost and the maintenance cost of the BBU are greatly reduced; the first optical wave demultiplexing device and the second optical wave demultiplexing device can realize wavelength division multiplexing, so that optical fibers are saved, and the operation and maintenance cost is reduced; for the RRU (namely the remote radio unit) working in the corresponding network mode, special treatment is not carried out, and operators do not need to additionally customize special RRU, so that the flexibility of products is greatly improved. The method and the system can solve the problems of waste of optical fiber resources and high BBU maintenance cost in the existing 5G NSA networking method, and based on the method and the system, the 4G base station and the 5G base station share the BBU to occupy small area of a machine room, so that the installation cost is reduced.
Drawings
Other features, objects and advantages of the present application will become more apparent upon reading of the detailed description of non-limiting embodiments, made with reference to the following drawings, in which:
fig. 1 is a block diagram of a base station system based on wavelength division multiplexing in one embodiment;
fig. 2 is a schematic diagram of a specific structure of a base station system based on wavelength division multiplexing in one embodiment;
fig. 3 is a schematic flow chart of downlink data transmission in the data transmission method in one embodiment;
fig. 4 is a schematic flow chart of uplink data transmission in the data transmission method in one embodiment.
Detailed Description
In order to facilitate an understanding of the present application, a more complete description of the present application will now be provided with reference to the relevant figures. Preferred embodiments of the present application are shown in the drawings. This application may, however, be embodied in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
It will be understood that when an element is referred to as being "connected" to another element, it can be directly connected to and integrated with the other element or intervening elements may also be present. The terms "one-to-one connection", "single fiber bi-directional assembly", "optical port", "one end", "another end", and the like are used herein for illustrative purposes only.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in the description of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. The term "and/or" as used herein includes any and all combinations of one or more of the associated listed items.
The 5G NSA networking mode in the traditional technology does not influence the networking mode of the current 4G base station, and can reduce the networking cost of the 5G base station. However, the conventional networking configuration greatly wastes BBU resources, wastes optical fiber resources, and requires two BBUs to be maintained at the same time, which is not an optimal solution.
The method and the system can solve the problems of waste of optical fiber resources and high BBU maintenance cost in the existing 5G NSA networking method, and based on the method and the system, the 4G base station and the 5G base station share the BBU to occupy small area of a machine room, so that the installation cost is reduced. Specifically, the method can realize 5G base station NSA networking based on wavelength division multiplexing, and different RRUs are independent of each other, so that normal operation of other RRUs is not affected even if one RRU is abnormal; the base station system based on the wavelength division multiplexing has strong feasibility of networking method, and the RRUs are mutually independent, so that the problem that the noise of the front-stage RRU is transmitted to the rear-stage RRU due to cascade reasons and the noise of the rear-stage RRU is further increased is solved. The physical connection in the application is star topology, and the RRUs are independent of each other and have no dependency.
In order to make the objects, technical solutions and advantages of the present application more apparent, the present application will be further described in detail with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the present application.
In one embodiment, as shown in fig. 1, a base station system based on wavelength division multiplexing is provided, and the base station system is used in the field of 5G NSA networking for illustration, and includes a baseband unit, a first optical wave demultiplexing device and a second optical wave demultiplexing device that are sequentially connected; the system also comprises each far-end radio frequency unit connected with the second optical wave demultiplexing device;
when the baseband unit receives downlink data of each network system transmitted by the core network, a corresponding data channel is adopted to modulate the corresponding downlink data into downlink optical signals, and each downlink optical signal is transmitted to the first optical wave demultiplexing device; the first optical wave demultiplexing device combines each downlink optical signal into a downlink composite optical wave and transmits the downlink composite optical wave to the second optical wave demultiplexing device; the second optical wave demultiplexing device decomposes the downlink composite optical wave into downlink optical waves and transmits the downlink optical waves to a remote radio frequency unit working in a corresponding network mode respectively;
when the second optical wave demultiplexing device receives the corresponding network type uplink data transmitted by each remote radio frequency unit, coupling each uplink data, and transmitting the obtained coupling uplink data to the first optical wave demultiplexing device; the first optical wave demultiplexing device decomposes the coupled uplink data into uplink optical waves and transmits the uplink optical waves to the baseband unit based on corresponding data channels.
Specifically, the baseband unit (i.e., BBU) in the present application may cover the functions of the 4G BBU and the 5G BBU; the front end of the BBU is connected with a core network to realize the downlink data interaction with the core network, and the BBU can transmit and modulate the baseband data (such as 4G baseband data and 5G baseband data) of each network system to different downlink ports according to independent channels; the lower interface of the BBU, i.e. the back end of the BBU, can be connected with the first optical wave demultiplexing device.
The front end of the first optical wave demultiplexing device is connected with the rear end of the BBU; the first optical wave demultiplexing device forwards transmits downlink data (namely data obtained by BBU through independent channel transmission modulation) of the base station to the second optical wave demultiplexing device through an optical fiber; likewise, the first optical wave demultiplexing device may transmit the base station uplink data (i.e. the coupling uplink data) transmitted by the second optical wave demultiplexing device to the BBU; further, the rear end of the first optical wave demultiplexing device is connected with the optical fiber; in a specific example, the data transmitted on the optical fiber at the back end of the first optical wavelength demultiplexing device is 4G and 5G uplink and downlink data with different wavelengths.
The front end of the second optical wave demultiplexing device is connected with the rear end of the first optical wave demultiplexing device through an optical fiber, and the second optical wave demultiplexing device decouples the downlink data (namely downlink composite optical waves) of the base station according to different wavelengths; in a specific example, the second optical demultiplexing device backend may be coupled to each remote radio unit (e.g., 4G RRU or 5G RRU) via an optical fiber.
It should be noted that, the 4G RRU in the present application is not different from the common 4G RRU; meanwhile, the 5G RRU is not different from the common 5G RRU; i.e. the application does not need any modification to the remote radio unit (i.e. RRU).
In a specific embodiment, the baseband unit includes a first optical port, a first optical module, a second optical port, and a second optical module;
one end of the first optical port is connected with the first optical wave demultiplexing device, and the other end of the first optical port is connected with the first optical module; the first optical module modulates the 4G network type downlink data transmitted by the core network into a downlink optical signal with a first wavelength;
one end of the second optical port is connected with the first optical wave demultiplexing device, and the other end of the second optical port is connected with the second optical module; the second optical module modulates the 5G network type downlink data transmitted by the core network into a downlink optical signal with a second wavelength;
wherein the first wavelength and the second wavelength are different.
Specifically, in the present application, the BBU needs to process uplink and downlink baseband data of each network system (e.g., 4G and 5G); taking 4G baseband data as an example: in the application, the 4G baseband data interact with the RRU through an optical port through an independent IQ (In-phase baseband) data channel. The downlink 4G optical port (i.e., the first optical port) of the BBU may be connected to a specific optical module (i.e., the first optical module), where the first optical module modulates IQ data into a specific optical wave a, and the optical wave a transmits the 4G IQ data through an optical fiber.
Similarly, take the 5G baseband data as an example: the 5G baseband data interact with the RRU through an optical port (namely a second optical port) through an independent IQ data channel. The downlink 5G optical port (namely a second optical port) of the BBU needs to be connected with a specific optical module (namely a second optical module), the second optical module modulates the IQ data into a specific optical wave b, and the optical wave b transmits the 5G IQ data through an optical fiber.
It should be noted that, in the present application, the optical module (i.e., the first optical module) connected to the 4G downlink optical port and the optical module (the second optical module) connected to the 5G downlink optical port have no specific requirements, and their functions are consistent with those of the common optical module; the difference is that the light waves a and b modulated by the first and second light modules are different. Wherein, the light wave a and the light wave b are different in the working wavelength, for example, the light wave a is a light wave with a center wavelength of 1550nm, and the light wave b is a light wave with a center wavelength of 1310 nm.
In a specific embodiment, the first optical wave demultiplexing device is connected to the second optical wave demultiplexing device by a single fiber bi-directional component.
Specifically, the front end of the first optical wave demultiplexing device is connected with the first optical module and the second optical module of the BBU through optical fibers, and the rear end of the first optical wave demultiplexing device is connected with the second optical wave demultiplexing device of the rear stage through an optical fiber.
Further, on the downlink side of the base station, the first optical wave demultiplexing device couples the BBU 4G downlink optical port optical fiber and the 5G downlink optical port optical fiber into a single fiber, and the single fiber forwards outputs downlink IQ data of 4G and 5G to the second optical wave demultiplexing device, namely the first optical wave demultiplexing device is connected with the second optical wave demultiplexing device by adopting a single-fiber bidirectional component; on the uplink side of the base station, 4G and 5G uplink data transmitted by a single fiber are decomposed into corresponding wavelengths through a first optical wave demultiplexing device and transmitted to the BBU through different channels.
In a specific embodiment, the second optical wave demultiplexing device is connected to each remote radio frequency unit in a one-to-one correspondence by each optical fiber.
Specifically, in the present application, the front end of the second optical wave demultiplexing device may be connected to the rear end of the first optical wave demultiplexing device through a single fiber, and each optical fiber at the rear end of the second optical wave demultiplexing device may be connected to each remote radio frequency unit in a one-to-one correspondence manner, for example, connected to the 4G RRU and the 5G RRU through two optical fibers, respectively. On the downlink side of the base station, 4G and 5G baseband data transmitted by the rear end of the first optical wave demultiplexing device through a single fiber are decomposed into different wavelength data through a demultiplexer, and then the different wavelength data are transmitted to the 4G RRU and the 5G RRU forwards through different optical fiber channels; on the uplink side of the base station, the data transmitted by the 4G RRU and the 5G RRU through the optical fiber are coupled through a second optical wave demultiplexing device, and the front end of the second optical wave demultiplexing device transmits the coupled data to the first optical wave demultiplexing device through a single fiber.
That is, the method can realize 5G base station NSA networking based on wavelength division multiplexing, no dependency relationship exists among different RRUs, the RRUs are mutually independent, and even if one RRU is abnormal, the normal operation of other RRUs is not influenced; the base station system based on the wavelength division multiplexing has strong feasibility of networking method, and the RRUs are mutually independent, so that the problem that the noise of the front-stage RRU is transmitted to the rear-stage RRU due to cascade reasons and the noise of the rear-stage RRU is further increased is solved. The physical connection of the method is star topology, and RRUs are independent of each other and have no dependency.
In a specific embodiment, the baseband unit is connected to the core network by an optical fiber.
Specifically, in the present application, the core network may be connected to the BBU through an optical fiber; the core network mainly handles the interaction between the uplink and downlink data of the base stations 4G and 5G of different cells.
In addition, in the application, the RRU is not structurally improved; for example, a 4G RRU may be consistent with a normal 4G RRU. On the downlink side of a base station, 4G RRU modulates 4G baseband data forward transferred by BBU into RF (Radio Frequency) data through RRU, and interacts with a terminal through space electromagnetic waves; on the uplink side of the base station, the 4G RRU RF front end demodulates the received terminal user data, and then transmits the terminal user data to the second optical wave demultiplexing device through the optical fiber, and then transmits the terminal user data to the BBU through the second optical wave demultiplexing device and the first optical wave demultiplexing device.
Meanwhile, in the present application, the 5G RRU may be identical to a general 5G RRU. On the downlink side of a base station, 5G RRU modulates 5G baseband data transmitted forward by BBU into RF data through RRU, and interacts with a terminal through space electromagnetic waves; on the uplink side of the base station, the 5G RRU RF front end demodulates the received terminal user data, and then transmits the terminal user data to the second optical wave demultiplexing device through the optical fiber, and then transmits the terminal user data to the BBU through the second optical wave demultiplexing device and the first optical wave demultiplexing device.
On one hand, the method introduces the wavelength division multiplexing technology, and the BBU can process the baseband data (such as 4G and 5G baseband data) of each network system at the same time, so that the overall network distribution cost is reduced. Based on the application, the functions of the 4G BBU and the 5G BBU can be completed in one BBU. The application provides that 5G NSA networking introduces wavelength division multiplexing technology networking, and has at least the following advantages: (1) the networking method is simple and easy to realize, has lower cost and stronger stability and reliability. (2) The application has strong universality and practicality.
Above, the present application provides a base station NSA networking mode based on wavelength division multiplexing; the BBU can process uplink and downlink baseband data of each network system (such as 4G and 5G) in real time, so that the production cost and the maintenance cost of the BBU are greatly reduced; the first optical wave demultiplexing device and the second optical wave demultiplexing device can realize wavelength division multiplexing, so that optical fibers are saved, and the operation and maintenance cost is reduced; for the remote radio frequency units working in the corresponding network system, special treatment is not carried out, and operators do not need to customize special RRUs additionally, so that the flexibility of products is greatly improved. The method and the system can solve the problems of waste of optical fiber resources and high BBU maintenance cost in the existing 5G NSA networking method, and based on the method and the system, the 4G base station and the 5G base station share the BBU to occupy small area of a machine room, so that the installation cost is reduced.
In one embodiment, as shown in fig. 2, a base station system based on wavelength division multiplexing is provided, and the base station system is used in the field of 5G NSA networking for illustration, and includes a baseband unit, a first optical wave demultiplexing device and a second optical wave demultiplexing device that are sequentially connected; the system also comprises each far-end radio frequency unit connected with the second optical wave demultiplexing device;
when the baseband unit receives downlink data of each network system transmitted by the core network, a corresponding data channel is adopted to modulate the corresponding downlink data into downlink optical signals, and each downlink optical signal is transmitted to the first optical wave demultiplexing device; the first optical wave demultiplexing device combines each downlink optical signal into a downlink composite optical wave and transmits the downlink composite optical wave to the second optical wave demultiplexing device; the second optical wave demultiplexing device decomposes the downlink composite optical wave into downlink optical waves and transmits the downlink optical waves to a remote radio frequency unit working in a corresponding network mode respectively;
when the second optical wave demultiplexing device receives the corresponding network type uplink data transmitted by each remote radio frequency unit, coupling each uplink data, and transmitting the obtained coupling uplink data to the first optical wave demultiplexing device; the first optical wave demultiplexing device decomposes the coupled uplink data into uplink optical waves and transmits the uplink optical waves to the baseband unit based on corresponding data channels.
In a specific embodiment, each network system includes a 4G network system and a 5G network system;
the first optical wave de-multiplexing device is a combiner; the second optical wave demultiplexing device is a demultiplexer.
In a specific embodiment, the remote radio unit includes at least two;
one of the remote radio units is a 4G network RRU, and the other remote radio unit is a 5G network RRU.
Specifically, as shown in fig. 2, the present application proposes a base station system including a core network, a BBU, a combiner, a demultiplexer, a 4G RRU (i.e., a 4G network RRU) and a 5G RRU (i.e., a 5G network RRU) based on a 5G base station NSA networking manner of wavelength division multiplexing; the following description is provided in connection with a specific example:
in the application, the core network is connected with the BBU through the optical fiber, and the core network mainly processes the interaction between the uplink data and the downlink data of the base stations 4G and 5G of different cells.
In the application, the BBU can process 4G and 5G uplink and downlink baseband data, and the 4G baseband data is interacted with the RRU through an independent IQ data channel and an optical port. The downlink 4G optical port of the BBU can be connected with a specific optical module, the optical module modulates the IQ data into specific optical waves a, and the optical waves a transmit the 4G IQ data through optical fibers. Similarly, the 5G baseband data can interact with the RRU through the optical port through the independent IQ data channel. The downlink 5G optical port of the BBU can be connected with a specific optical module, the optical module modulates the IQ data into a specific optical wave b, and the optical wave b transmits the 5G IQ data through an optical fiber. The optical module connected with the 4G lower light-coupling port and the optical module connected with the 5G lower light-coupling port have no specific requirements, and the functions of the optical module are consistent with those of the common optical module, and the difference is that the optical module of the 4G lower light-coupling port is different from the optical wave a and the optical wave b modulated by the optical module of the 5G lower light-coupling port (namely, the wavelengths are different).
In the application, the front end of the wave combiner is connected with the BBU 4G lower light-coupling port optical module and the 5G lower light-coupling port optical module through optical fibers, and the rear end of the wave combiner is connected with a rear-stage wave splitter through an optical fiber. On the downlink side of a base station, a combiner couples the 4G and 5G downlink optical port fibers from the BBU 4G downlink optical port fibers into a single fiber (namely, single-line bidirectional), and the single fiber forwards outputs downlink IQ data of the 4G and 5G to a demultiplexer; on the uplink side of the base station, 4G and 5G uplink data transmitted by a single fiber are decomposed into corresponding wavelengths through a combiner and transmitted to the BBU through different channels.
In the application, the front end of the wave splitter is connected with the rear end of the wave combiner through a single fiber, and the rear end of the wave splitter is connected with the 4G RRU and the 5G RRU through two optical fibers respectively. On the downlink side of the base station, 4G and 5G baseband data transmitted by the rear end of the combiner through a single fiber are decomposed into different wavelength data through a demultiplexer, and then are transmitted to 4G RRU and 5G RRU forwards through different fiber channels; on the uplink side of the base station, the data transmitted by the 4G RRU and the 5G RRU through the optical fiber are coupled through a demultiplexer, and the front end of the demultiplexer transmits the coupled data through a single-fiber Xiang Gebo unit.
Further, in the application, the wave combiner and the wave splitter have the wave combining and dividing functions; in a specific example, the demultiplexer and the multiplexer may have the same function, and may be implemented by using an optical wave demultiplexing device; the function can be to separate the composite optical wave composed of the optical wave a and the optical wave b from the single fiber to be transmitted along the two optical fibers, otherwise, the function can be described as that the optical wave a and the optical wave b respectively transmitted along the two optical fibers are combined into the composite optical wave to be transmitted along the single fiber after passing through the device.
In the application, the 4G RRU is consistent with the common 4G RRU. On the downlink side of a base station, 4G RRU modulates 4G baseband data transmitted forward by BBU into RF data through RRU, and interacts with a terminal through space electromagnetic waves; on the uplink side of the base station, the 4G RRU RF front end demodulates the received terminal user data, and then transmits the terminal user data to the demultiplexer through the optical fiber, and then transmits the terminal user data to the BBU through the demultiplexer and the multiplexer.
In the application, the 5G RRU is consistent with the common 5G RRU. On the downlink side of a base station, 5G RRU modulates 5G baseband data transmitted forward by BBU into RF data through RRU, and interacts with a terminal through space electromagnetic waves; on the uplink side of the base station, the 5G RRU RF front end demodulates the received terminal user data, and then transmits the terminal user data to the demultiplexer through the optical fiber, and then transmits the terminal user data to the BBU through the demultiplexer and the multiplexer.
Above, the present application provides a base station NSA networking mode based on wavelength division multiplexing; the BBU is responsible for processing the uplink baseband data and the downlink baseband data of the 4G and the 5G in real time, so that the production cost and the maintenance cost of the BBU are greatly reduced; the wave combiner and the wave separator are based on the current mature wavelength division multiplexing technology, so that optical fibers are greatly saved, and the operation and maintenance cost is reduced; the 4G RRU and the 5G RRU do not need to be specially processed, are consistent with the RRU of the current base station system, and operators do not need to additionally customize the special RRU, so that the flexibility of products is greatly improved. The method and the system can solve the problems of waste of optical fiber resources and high BBU maintenance cost in the existing 5G NSA networking method, and based on the method and the system, the 4G base station and the 5G base station share the BBU to occupy small area of a machine room, so that the installation cost is reduced.
It will be appreciated by those skilled in the art that the structures shown in fig. 1 and 2 are merely block diagrams of partial structures related to the present application and do not constitute limitations of the apparatus to which the present application is applied, and that a specific apparatus may include more or less components than those shown in the drawings, or may combine some components, or have different arrangements of components.
In one embodiment, as shown in fig. 3 and fig. 4, a data transmission method is provided, and the BBU in any of the foregoing base station systems based on wavelength division multiplexing is taken as an example for explanation, where the method includes downlink data transmission and uplink data transmission;
the downlink data transmission includes the steps of:
step S310, when receiving downlink data of each network system transmitted by a core network, modulating the corresponding downlink data into a downlink optical signal by adopting a corresponding data channel;
step S320, transmitting each downlink optical signal to a first optical wave demultiplexing device; each downlink optical signal is used for indicating the first optical wave demultiplexing device to transmit the downlink composite optical wave obtained by combining to the second optical wave demultiplexing device; the downlink composite light wave is used for indicating the second light wave demultiplexing device to transmit each downlink light wave obtained by decomposition to a remote radio frequency unit working in a corresponding network mode respectively;
the uplink data transmission includes the steps of:
step S410, each uplink light wave is the coupling uplink data transmitted by the second light wave demultiplexing device and is obtained by decomposing the coupling uplink data by the first light wave demultiplexing device; the coupling uplink data are obtained by coupling corresponding network type uplink data transmitted by each remote radio frequency unit through a second optical wave demultiplexing device;
step S420, each uplink optical wave transmitted by the first optical wave demultiplexing device is received based on the corresponding data channel.
In a specific embodiment, each network downlink data includes IQ data of a 4G network and IQ data of a 5G network;
the step of modulating the corresponding downlink data into a downlink optical signal by adopting the corresponding data channel comprises the following steps:
modulating the IQ data of the 4G network system into a downlink optical signal of a first wavelength;
modulating the IQ data of the 5G network system into a downlink optical signal of a second wavelength;
wherein the first wavelength and the second wavelength are different.
Specifically, the specific implementation flow of the data transmission method in the present application may be referred to the above limitation of the base station system based on wavelength division multiplexing, and will not be described herein. The BBU in the application is responsible for processing the uplink and downlink baseband data of 4G and 5G in real time, so that the production cost and the maintenance cost of the BBU are greatly reduced; wherein, the BBU in the application covers the functions of the 4G BBU and the 5G BBU; specifically, the BBU in the application can be developed by integrating the hardware and software functions of the 4G BBU and the 5G BBU into the same BBU, so that the BBU has the functions of the 4G BBU and the 5G BBU.
It should be understood that, although the steps in the flowcharts of fig. 3 and 4 are shown in order as indicated by the arrows, these steps are not necessarily performed in order as indicated by the arrows. The steps are not strictly limited to the order of execution unless explicitly recited herein, and the steps may be executed in other orders. Moreover, at least some of the steps in fig. 3, 4 may include multiple sub-steps or multiple stages, which are not necessarily performed at the same time, but may be performed at different times, which are not necessarily performed sequentially, but may be performed alternately or alternately with at least a portion of the other steps or sub-steps of other steps.
In one embodiment, there is provided a data transmission apparatus including:
the modulation module is used for modulating the corresponding downlink data into a downlink optical signal by adopting a corresponding data channel when receiving the downlink data of each network system transmitted by the core network;
the transmission module is used for transmitting each downlink optical signal to the first optical wave demultiplexing device; each downlink optical signal is used for indicating the first optical wave demultiplexing device to transmit the downlink composite optical wave obtained by combining to the second optical wave demultiplexing device; the downlink composite light wave is used for indicating the second light wave demultiplexing device to transmit each downlink light wave obtained by decomposition to a remote radio frequency unit working in a corresponding network mode respectively;
further comprises:
the receiving module is used for receiving each uplink light wave transmitted by the first light wave demultiplexing device based on the corresponding data channel; each uplink light wave is the coupling uplink data transmitted by the second light wave demultiplexing device and is obtained by decomposing the coupling uplink data by the first light wave demultiplexing device; the coupling uplink data are obtained by coupling corresponding network type uplink data transmitted by each remote radio frequency unit through a second optical wave demultiplexing device.
For specific limitations of the data transmission device, reference may be made to the above limitation of the data transmission method, and no further description is given here. The respective modules in the above-described data transmission apparatus may be implemented in whole or in part by software, hardware, and combinations thereof. The above modules may be embedded in hardware or may be independent of a processor in the computer device, or may be stored in software in a memory in the computer device, so that the processor may call and execute operations corresponding to the above modules.
In one embodiment, a computer-readable storage medium is provided, having stored thereon a computer program which, when executed by a processor, implements the steps of any of the methods described above.
Those skilled in the art will appreciate that implementing all or part of the above described methods may be accomplished by way of a computer program stored on a non-transitory computer readable storage medium, which when executed, may comprise the steps of the embodiments of the methods described above. Any reference to memory, storage, database, or other medium used in the various embodiments provided herein may include non-volatile and/or volatile memory. The nonvolatile memory can include Read Only Memory (ROM), programmable ROM (PROM), electrically Programmable ROM (EPROM), electrically Erasable Programmable ROM (EEPROM), or flash memory. Volatile memory can include Random Access Memory (RAM) or external cache memory. By way of illustration and not limitation, RAM is available in a variety of forms such as Static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), double Data Rate SDRAM (DDRSDRAM), enhanced SDRAM (ESDRAM), synchronous Link DRAM (SLDRAM), memory bus dynamic random access memory (RDRAM), and interface dynamic random access memory (DRDRAM).
The technical features of the above-described embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above-described embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.
The above examples merely represent a few embodiments of the present application, which are described in more detail and are not to be construed as limiting the scope of the invention. It should be noted that it would be apparent to those skilled in the art that various modifications and improvements could be made without departing from the spirit of the present application, which would be within the scope of the present application. Accordingly, the scope of protection of the present invention is to be determined by the appended claims.
Claims (9)
1. The base station system based on wavelength division multiplexing is characterized by comprising a baseband unit, a first optical wave demultiplexing device and a second optical wave demultiplexing device which are connected in sequence; the system also comprises remote radio frequency units respectively connected with the second optical wave demultiplexing device;
when the baseband unit receives downlink data of each network system transmitted by the core network, a corresponding data channel is adopted to modulate the corresponding downlink data into downlink optical signals, and each downlink optical signal is transmitted to the first optical wave demultiplexing device; the first optical wave demultiplexing device combines each downlink optical signal into a downlink composite optical wave and transmits the downlink composite optical wave to the second optical wave demultiplexing device; the second optical wave demultiplexing device decomposes the downlink composite optical wave into downlink optical waves and transmits the downlink optical waves to the remote radio frequency unit working in a corresponding network mode respectively; each network system comprises a 4G network system and a 5G network system;
when the second optical wave demultiplexing device receives the corresponding network type uplink data transmitted by each remote radio frequency unit, coupling each uplink data to obtain coupled uplink data, and transmitting the coupled uplink data to the first optical wave demultiplexing device; the first optical wave demultiplexing device decomposes the coupled uplink data into uplink optical waves and transmits the uplink optical waves to the baseband unit based on corresponding data channels;
the baseband unit comprises a first optical port, a first optical module, a second optical port and a second optical module;
one end of the first optical port is connected with the first optical wave demultiplexing device, and the other end of the first optical port is connected with the first optical module; the first optical module modulates the 4G network type downlink data transmitted by the core network into a downlink optical signal with a first wavelength;
one end of the second optical port is connected with the first optical wave demultiplexing device, and the other end of the second optical port is connected with the second optical module; the second optical module modulates the 5G network type downlink data transmitted by the core network into a downlink optical signal with a second wavelength;
wherein the first wavelength and the second wavelength are different.
2. The wavelength division multiplexing based base station system according to claim 1, wherein the first optical wave demultiplexing device is a combiner; the second optical wave demultiplexing device is a demultiplexer.
3. The wdm-based base station system of claim 2, wherein the remote radio unit includes at least two;
one of the remote radio units is a 4G network RRU, and the other remote radio unit is a 5G network RRU.
4. A base station system based on wavelength division multiplexing according to any of claims 1 to 3, wherein said first optical wave demultiplexing means is connected to said second optical wave demultiplexing means by a single fibre bi-directional component.
5. The wavelength division multiplexing based base station system according to claim 4, wherein the second optical wave demultiplexing device is connected to each of the remote radio units in a one-to-one correspondence via each optical fiber.
6. A base station system based on wavelength division multiplexing according to any of claims 1 to 3, wherein the baseband unit is connected to the core network by means of optical fibers.
7. A data transmission method based on the base station system based on wavelength division multiplexing as claimed in any one of claims 1 to 6, characterized by comprising downlink data transmission and uplink data transmission;
the downlink data transmission includes the steps of:
when receiving downlink data of each network system transmitted by a core network, modulating the corresponding downlink data into downlink optical signals by adopting a corresponding data channel, and transmitting each downlink optical signal to the first optical wave demultiplexing device;
each downlink optical signal is used for indicating the first optical wave demultiplexing device to transmit the downlink composite optical wave obtained by combining to the second optical wave demultiplexing device; the downlink composite light wave is used for indicating the second light wave demultiplexing device to transmit each downlink light wave obtained by decomposition to the remote radio frequency unit working in a corresponding network mode respectively;
the uplink data transmission includes the steps of:
receiving each uplink light wave transmitted by the first light wave demultiplexing device based on a corresponding data channel; each uplink light wave is coupling uplink data transmitted by the second light wave demultiplexing device and is obtained by decomposing the coupling uplink data by the first light wave demultiplexing device; the coupling uplink data are obtained by coupling corresponding network type uplink data transmitted by each far-end radio frequency unit through the second optical wave demultiplexing device.
8. The data transmission method according to claim 7, wherein each network-type downlink data includes IQ data of a 4G network type and IQ data of a 5G network type;
the step of modulating the corresponding downlink data into a downlink optical signal by adopting a corresponding data channel comprises the following steps:
modulating the IQ data of the 4G network system into a downlink optical signal with a first wavelength;
modulating the IQ data of the 5G network system into a downlink optical signal with a second wavelength;
wherein the first wavelength and the second wavelength are different.
9. A computer readable storage medium, on which a computer program is stored, characterized in that the computer program, when being executed by a processor, implements the steps of the method of claim 7 or 8.
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| CN113329443A (en) * | 2021-04-26 | 2021-08-31 | 新华三技术有限公司成都分公司 | Baseband data merging method |
| CN114466085A (en) * | 2021-12-30 | 2022-05-10 | 华为技术有限公司 | Data transmission method, radio frequency unit, baseband unit and communication system |
| CN115474252B (en) * | 2022-10-31 | 2023-03-14 | 煤炭科学技术研究院有限公司 | Base station switching method and device and mining 5G wireless networking system |
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