CN109687899B - Method for transmitting satellite synchronous signal on extended type pico-base station - Google Patents
Method for transmitting satellite synchronous signal on extended type pico-base station Download PDFInfo
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- CN109687899B CN109687899B CN201910038916.9A CN201910038916A CN109687899B CN 109687899 B CN109687899 B CN 109687899B CN 201910038916 A CN201910038916 A CN 201910038916A CN 109687899 B CN109687899 B CN 109687899B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/14—Relay systems
- H04B7/15—Active relay systems
- H04B7/185—Space-based or airborne stations; Stations for satellite systems
- H04B7/1851—Systems using a satellite or space-based relay
- H04B7/18517—Transmission equipment in earth stations
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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
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J3/00—Time-division multiplex systems
- H04J3/02—Details
- H04J3/06—Synchronising arrangements
- H04J3/0635—Clock or time synchronisation in a network
- H04J3/0638—Clock or time synchronisation among nodes; Internode synchronisation
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L7/00—Arrangements for synchronising receiver with transmitter
- H04L7/0016—Arrangements for synchronising receiver with transmitter correction of synchronization errors
- H04L7/0033—Correction by delay
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W56/00—Synchronisation arrangements
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
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- H04W56/001—Synchronization between nodes
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Abstract
The embodiment of the invention provides a method for transmitting satellite synchronization signals on an extended pico-base station, which comprises the following steps: the baseband unit receives the satellite synchronization signal, combines the satellite synchronization signal with the service data, and converts the satellite synchronization signal into an optical signal so as to transmit the optical signal in an optical fiber; the extension unit receives the optical signal and converts the optical signal into an electrical signal so that the electrical signal is transmitted in a twisted pair; and the radio remote unit receives the electric signal, separates and restores the satellite synchronization signal from the electric signal, and transmits the satellite synchronization signal. According to the method for transmitting the satellite synchronization signal on the extended pico-base station, provided by the embodiment of the invention, the satellite synchronization signal is transmitted through the extended pico-base station, the transmission link of the extended pico-base station is fully utilized, repeated construction is avoided, the deployment investment is low, and the distribution is flexible; and effectively solves the problem of limitation of the remote distance of the satellite synchronization signal.
Description
Technical Field
The embodiment of the invention relates to the technical field of communication, in particular to a method for transmitting satellite synchronization signals on an extended pico-base station.
Background
The extended pico-base station is an indoor coverage scheme actively promoted and deployed by current mobile operators, and realizes distributed coverage of 2G, 3G and 4G mobile communication signals according to different systems. The base band unit and the radio remote unit are separated, and the extension unit is added in the middle, so that flexible distribution and miniaturization of the radio remote unit are realized.
Satellite synchronization, such as GPS (global positioning system), beidou, etc., is widely used in many fields, and requires application scenarios with positioning, navigation, timing, and synchronization functions, and satellite synchronization is an optimal solution. Satellite synchronization is the preferred scheme for realizing the whole-network synchronization of the extended pico-base station, and a synchronization signal is accessed to a baseband unit therein.
The satellite synchronization signal has little energy reaching the ground and poor penetration, so that the signal reception needs a good sky environment, which greatly limits the deployment position of the receiving antenna. When the indoor equipment needs satellite synchronization signals, two main schemes are provided: firstly, a receiving star card is positioned at the equipment side, such as a passive GPS, and a radio frequency feeder line is adopted to transmit a satellite synchronous carrier modulation signal; the other is that the receiving star card is located at the antenna side, such as RGPS (remote GPS), and the decoded 1pps + ToD (pulse per second + time of day) differential signal is transmitted by using twisted pair. Both schemes have significant limitations: (1) the maximum remote distance of the feeder scheme is not more than 100 meters due to the signal attenuation problem, and if the feeder indoor distribution system is considered to be covered, the actual remote distance is shorter; (2) the remote distance of the twisted pair scheme is improved, but is limited by power supply and twisted pair transmission distortion factors, still can not exceed 300 meters, and the transmitted is the decoded differential signal, can only be accessed to one device for use, can not be used for distributing coverage flexibly. Therefore, it is difficult to acquire the synchronization signal for many devices and terminals installed in large buildings, shopping malls and tunnels and requiring satellite synchronization.
Disclosure of Invention
It is an object of embodiments of the present invention to provide a method of transmitting satellite synchronization signals on an extended pico base station that overcomes or at least partially solves the above mentioned problems.
In order to solve the above technical problem, in one aspect, an embodiment of the present invention provides a method for transmitting a satellite synchronization signal on an extended pico-base station, including:
the baseband unit receives the satellite synchronization signal, combines the satellite synchronization signal with the service data, and converts the satellite synchronization signal into an optical signal so as to transmit the optical signal in an optical fiber;
the extension unit receives the optical signal and converts the optical signal into an electrical signal so that the electrical signal is transmitted in a twisted pair;
and the radio remote unit receives the electric signal, separates and restores the satellite synchronization signal from the electric signal, and transmits the satellite synchronization signal.
In another aspect, an embodiment of the present invention provides an extended pico-base station, including:
the baseband unit is used for receiving the satellite synchronization signal, merging the satellite synchronization signal with the service data and converting the satellite synchronization signal into an optical signal so as to transmit the optical signal in an optical fiber;
the extension unit is used for receiving the optical signal and converting the optical signal into an electrical signal so that the electrical signal is transmitted in a twisted pair;
and the radio frequency remote unit is used for receiving the electric signal, separating and restoring the satellite synchronizing signal from the electric signal and transmitting the satellite synchronizing signal.
In another aspect, an embodiment of the present invention provides an electronic device, including:
the processor and the memory are communicated with each other through a bus; the memory stores program instructions executable by the processor, which when called by the processor are capable of performing the methods described above.
In yet another aspect, the present invention provides a non-transitory computer readable storage medium, on which a computer program is stored, which when executed by a processor, implements the above-mentioned method.
According to the method for transmitting the satellite synchronization signal on the extended pico-base station, provided by the embodiment of the invention, the satellite synchronization signal is transmitted through the extended pico-base station, the transmission link of the extended pico-base station is fully utilized, repeated construction is avoided, the deployment investment is low, and the distribution is flexible; the problem of limitation of the remote distance of the satellite synchronization signal is effectively solved, and an effective solution is provided for equipment and terminals in environments such as long tunnels, large buildings and basements to acquire the satellite synchronization signal.
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Fig. 1 is a schematic diagram of a method for transmitting a satellite synchronization signal on an extended pico-base station according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of an extended pico-base station according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a baseband unit of an extended pico-base station according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of an extension unit of an extended pico-base station according to an embodiment of the present invention;
fig. 5 is a schematic structural diagram of a radio remote unit of an extended pico-base station according to an embodiment of the present invention;
fig. 6 is a schematic structural diagram of an electronic device according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without making any creative effort, shall fall within the protection scope of the present invention.
Fig. 1 is a schematic diagram of a method for transmitting a satellite synchronization signal on an extended pico-base station according to an embodiment of the present invention, and as shown in fig. 1, an embodiment of the present invention provides a method for transmitting a satellite synchronization signal on an extended pico-base station, where an execution subject of the method is an extended pico-base station, and the method includes:
step S101, a baseband unit receives a satellite synchronization signal, combines the satellite synchronization signal with service data, and converts the satellite synchronization signal into an optical signal so that the optical signal is transmitted in an optical fiber;
step S102, an extension unit receives the optical signal and converts the optical signal into an electrical signal so that the electrical signal is transmitted in a twisted pair;
and step S103, the radio remote unit receives the electric signal, separates and restores the satellite synchronization signal from the electric signal, and transmits the satellite synchronization signal.
Specifically, fig. 2 is a schematic structural diagram of an extended pico-base station according to an embodiment of the present invention, and as shown in fig. 2, the extended pico-base station according to the embodiment of the present invention includes a baseband unit, a plurality of extension units, and a plurality of remote radio units. The base band unit is connected with the extension unit through an optical fiber, and the extension unit is connected with the radio remote unit through a twisted pair (network cable); the extension unit can be connected with a plurality of radio remote units in a downlink mode, and can also be connected with a lower-level extension unit in a cascade mode.
Firstly, a satellite synchronization signal is received through a baseband unit, combined with service data, and converted into an optical signal, so that the optical signal is transmitted in an optical fiber.
Then, the extension unit receives the optical signal transmitted by the baseband unit and converts the optical signal into an electrical signal so that the electrical signal is transmitted in the twisted pair.
And finally, the radio remote unit receives the electric signal, separates and restores the satellite synchronous signal from the electric signal, and transmits the satellite synchronous signal. And after the synchronization equipment receives the satellite synchronization signal, synchronization is realized.
According to the method for transmitting the satellite synchronization signal on the extended pico-base station, provided by the embodiment of the invention, the satellite synchronization signal is transmitted through the extended pico-base station, the transmission link of the extended pico-base station is fully utilized, repeated construction is avoided, the deployment investment is low, and the distribution is flexible; the problem of limitation of the remote distance of the satellite synchronization signal is effectively solved, and an effective solution is provided for equipment and terminals in environments such as long tunnels, large buildings and basements to acquire the satellite synchronization signal.
On the basis of the foregoing embodiment, further, the receiving a satellite synchronization signal, combining the satellite synchronization signal with service data, and converting the satellite synchronization signal into an optical signal specifically includes:
receiving a satellite synchronization signal;
amplifying the received satellite synchronization signal;
carrying out A/D processing on the amplified satellite synchronization signal;
and merging the satellite synchronous signal subjected to the A/D processing with the service data, and converting the merged signal into an optical signal.
Specifically, fig. 3 is a schematic structural diagram of a baseband unit of an extended pico-base station according to an embodiment of the present invention, and as shown in fig. 3, the baseband unit of the extended pico-base station according to the embodiment of the present invention includes a satellite synchronization signal receiving antenna 301, a splitter 302, a satellite synchronization receiving star card 303, a first amplifier 304, an a/D converter 305, a baseband processing module 306, a first FPGA module 307, a time-frequency processing module 308, and a first digital laser 309. It should be noted that fig. 3 is a schematic diagram, and is a preferred embodiment.
The baseband unit in the embodiment of the present invention may not include some components therein, and accordingly, the connection relationship between the components is also different.
First, a satellite synchronization signal is received by the satellite synchronization signal receiving antenna 301, and the satellite synchronization signal receiving antenna 301 transmits the satellite synchronization signal to the first amplifier 304 through the antenna feeder to amplify the received satellite synchronization signal, where the first amplifier 304 is a low noise amplifier.
Then, the satellite synchronization signal after the amplification processing is a/D processed by the a/D converter 305, so that the satellite synchronization signal is converted from an analog signal to a digital signal.
Finally, the satellite synchronization signal after a/D processing is merged with the service data, and the satellite synchronization signal after a/D processing is converted into an optical signal by the first digital laser 309, and the optical signal is transmitted to the expansion unit through an optical fiber.
According to the method for transmitting the satellite synchronization signal on the extended pico-base station, provided by the embodiment of the invention, the satellite synchronization signal is transmitted through the extended pico-base station, the transmission link of the extended pico-base station is fully utilized, repeated construction is avoided, the deployment investment is low, and the distribution is flexible; the problem of limitation of the remote distance of the satellite synchronization signal is effectively solved, and an effective solution is provided for equipment and terminals in environments such as long tunnels, large buildings and basements to acquire the satellite synchronization signal.
On the basis of the foregoing embodiments, further, the merging the satellite synchronization signal subjected to the a/D processing with the service data, and then converting the merged satellite synchronization signal into an optical signal specifically includes:
combining the satellite synchronous signals after A/D processing with service data to assemble common public radio interface CPRI frames;
and converting the CPRI frame into an optical signal.
Specifically, as shown in fig. 3, in the embodiment of the present invention, the baseband unit further includes a first FPGA module 307.
Before converting the satellite synchronization signal into the optical signal, the satellite synchronization signal after the a/D processing and the service data are combined by the first FPGA module 307 to be assembled into a common public radio interface CPRI frame, and the CPRI frame is transmitted to the first digital laser 309, and then the CPRI frame is converted into the optical signal by the first digital laser 309 and transmitted to the expansion unit through the optical fiber.
The baseband processing module 306 is a processing core of the base station, and includes a physical layer and a protocol stack content, so as to implement service data access and baseband processing from a core network, and can process 2G, 3G, and 4G mobile communication services according to different base station systems. The FPGA mainly realizes framing and deframing of CPRI, and combines synchronous signal data from the A/D, service baseband data from a baseband processing module, OAM (operation, administration and maintenance) and other channel associated data according to a certain rule in the downlink direction to assemble CPRI frames suitable for optical fiber transmission, wherein the satellite synchronous signals are placed at the fixed positions of the CPRI frames.
According to the method for transmitting the satellite synchronization signal on the extended pico-base station, provided by the embodiment of the invention, the satellite synchronization signal is transmitted through the extended pico-base station, the transmission link of the extended pico-base station is fully utilized, repeated construction is avoided, the deployment investment is low, and the distribution is flexible; the problem of limitation of the remote distance of the satellite synchronization signal is effectively solved, and an effective solution is provided for equipment and terminals in environments such as long tunnels, large buildings and basements to acquire the satellite synchronization signal.
On the basis of the foregoing embodiments, further, the amplifying the received satellite synchronization signal specifically includes:
dividing the acquired satellite synchronization signal into two paths;
amplifying one path of satellite synchronization signal;
and separating and restoring the pulse per second and the time information from the other path of satellite synchronization signal, and realizing the whole network synchronization of the base station according to the pulse per second and the time information.
Specifically, as shown in fig. 3, the baseband unit in the embodiment of the present invention further includes a splitter 302, a satellite synchronous reception star card 303, and a time-frequency processing module 308.
The splitter 302 splits the carrier received by the satellite synchronization signal receiving antenna 301, and the first amplifier 304 amplifies one of the satellite synchronization signals to serve as a remote signal source of the synchronization signal to enter a remote processing channel.
The other path of satellite synchronization signal is accessed to the satellite synchronization receiving star card 303, the satellite synchronization receiving star card 303 separates and restores the pulse per second and the time information (1pps + ToD), and transmits the pulse per second and the time information to the time-frequency processing module 308, the time-frequency processing module 308 outputs clock signals of various frequencies required by service processing according to the received 1pps + ToD information as a reference, and simultaneously provides a clock source for sampling the synchronization signal a/D, so that the base station realizes self synchronization, and ensures the synchronization of the satellite synchronization signal sampling.
The clock used in the whole process of transmitting and processing the satellite synchronization signal is synchronous with the synchronous clock obtained by the baseband unit, so that the recovered satellite synchronization signal can not generate frequency offset. The satellite synchronization signals acquired by the covered equipment and terminals can realize frequency synchronization, if accurate time synchronization is required, time compensation needs to be set on the equipment and terminal sides according to the downlink processing time delay of the satellite synchronization signals, and accurate time synchronization can be realized. The downlink processing delay can be measured automatically or manually.
According to the method for transmitting the satellite synchronization signal on the extended pico-base station, provided by the embodiment of the invention, the satellite synchronization signal is transmitted through the extended pico-base station, the transmission link of the extended pico-base station is fully utilized, repeated construction is avoided, the deployment investment is low, and the distribution is flexible; the problem of limitation of the remote distance of the satellite synchronization signal is effectively solved, and an effective solution is provided for equipment and terminals in environments such as long tunnels, large buildings and basements to acquire the satellite synchronization signal.
On the basis of the foregoing embodiments, further, the receiving the optical signal and converting the optical signal into an electrical signal specifically includes:
receiving the optical signal and converting the optical signal into an electrical signal;
the electrical signals are assembled into Ethernet frames.
Specifically, fig. 4 is a schematic structural diagram of an extension unit of an extended pico-base station according to an embodiment of the present invention, and as shown in fig. 4, the extension unit of the base station according to the embodiment of the present invention includes a second digital laser 401, a second FPGA module 402, a first physical layer (PHY) interface 403, a cascaded digital laser 404, and a PSE module 405. It should be noted that fig. 4 is a schematic diagram, and is a preferred embodiment.
The extension unit in the embodiment of the present invention may not include some components therein, and accordingly, the connection relationship between the components is different.
In the downstream direction, first, the second digital laser 401 acquires an optical signal from the baseband unit through an optical fiber.
The optical signal is then converted to an electrical signal by the second digital laser 401 and the electrical signal is transmitted to the second FPGA module 402.
Finally, the second FPGA module 402 copies a copy of data and forwards the data to the cascaded digital laser 404 for cascade forwarding, and sends the data to the lower-level extension unit.
For the downlink processing link, the second FPGA module 402 deframes the CPRI signal, separates out OAM or other associated data required by the extension unit, frames the service data, the satellite synchronization signal data, and OAM data of the remote unit according to the ethernet frame format required by the network cable transmission, and sends to the ethernet PHY interface 403. The PHY interface 403 completes data transceiving to each downlink port, and the data transceiving uses a channel associated clock extracted from the downlink data by the second FPGA module 402 to achieve synchronization between each unit.
The PSE module 405 feeds 48V dc into pins defined by the standard POE line sequence in each downlink port, and supplies power to the downlink rf expansion unit through the network cable.
In the uplink direction, the second FPGA module 402 completes the deframing of the ethernet frame and the framing of the CPRI frame.
According to the method for transmitting the satellite synchronization signal on the extended pico-base station, provided by the embodiment of the invention, the satellite synchronization signal is transmitted through the extended pico-base station, the transmission link of the extended pico-base station is fully utilized, repeated construction is avoided, the deployment investment is low, and the distribution is flexible; the problem of limitation of the remote distance of the satellite synchronization signal is effectively solved, and an effective solution is provided for equipment and terminals in environments such as long tunnels, large buildings and basements to acquire the satellite synchronization signal.
On the basis of the foregoing embodiments, further, the receiving the electrical signal, separating and recovering the satellite synchronization signal therefrom, and transmitting the satellite synchronization signal includes:
receiving the electrical signal;
separating and recovering the satellite synchronization signal from the electric signal;
D/A processing is carried out on the satellite synchronous signal;
amplifying the satellite synchronous signals subjected to the D/A processing;
filtering the amplified satellite synchronization signal;
and transmitting the satellite synchronization signal after filtering processing through a radio frequency antenna.
Specifically, fig. 5 is a schematic structural diagram of a radio remote unit of an extended pico-base station according to an embodiment of the present invention, and as shown in fig. 5, the radio remote unit of the base station according to the embodiment of the present invention includes a second PHY interface 501, a third FPGA module 502, a D/a (a/D) converter 503, a third amplifier 504, a first filter 505, a D/a converter 506, a second amplifier 507, a second filter 508, a combiner 509, a POE power processing module 510, a broadband coverage antenna 511, and an independent coverage antenna 512. It should be noted that fig. 5 is a schematic diagram, and is a preferred embodiment.
The remote radio unit in the embodiment of the present invention may not include some components therein, and accordingly, the connection relationship between the components is different.
First, the third FPGA module 502 receives ethernet data from the extension unit from the PHY interface 501, deframes it, and then separates the satellite synchronization signal from the traffic data.
Then, the service data is transmitted to a D/a (a/D) converter 503, amplified by a third amplifier 504, filtered by a first filter 505 (a duplexer for frequency division), and finally transmitted through a broadband coverage antenna 511. The operating frequency band of the first filter 505 corresponds to the frequency band of the mobile communication signal.
The third FPGA module 502 transmits the separated satellite synchronization signal to the D/a converter 506, and recovers a synchronization carrier signal.
After the D/a converter 506 restores the synchronous carrier signal, the signal is amplified by the second amplifier 507, filtered by the second filter 508, and finally transmitted by the independent coverage antenna 512. Wherein the operating frequency band of the second amplifier 507 and the second filter 508 corresponds to the satellite synchronization signal frequency band.
In addition, the service data and the satellite synchronization signal may be combined by the combiner 509, and then the combined data may be transmitted by the broadband coverage antenna 511. In this case, the broadband coverage antenna 511 should support both the mobile communication signal band and the satellite synchronization signal band, and the separate coverage antenna 512 is not installed.
According to the method for transmitting the satellite synchronization signal on the extended pico-base station, provided by the embodiment of the invention, the satellite synchronization signal is transmitted through the extended pico-base station, the transmission link of the extended pico-base station is fully utilized, repeated construction is avoided, the deployment investment is low, and the distribution is flexible; the problem of limitation of the remote distance of the satellite synchronization signal is effectively solved, and an effective solution is provided for equipment and terminals in environments such as long tunnels, large buildings and basements to acquire the satellite synchronization signal.
Fig. 2 is a schematic structural diagram of an extended pico-base station according to an embodiment of the present invention, and as shown in fig. 2, an extended pico-base station according to an embodiment of the present invention is configured to perform the method described in any of the embodiments above, and specifically includes a baseband unit, an extension unit, and a radio remote unit, where:
the baseband unit is used for receiving the satellite synchronization signal, merging the satellite synchronization signal with the service data and converting the satellite synchronization signal into an optical signal so as to transmit the optical signal in an optical fiber; the extension unit is used for receiving the optical signal and converting the optical signal into an electrical signal so that the electrical signal is transmitted in a twisted pair; the radio remote unit is used for receiving the electric signal, separating and restoring the satellite synchronous signal from the electric signal, and transmitting the satellite synchronous signal.
Specifically, the extended pico-base station according to the embodiment of the present invention includes a baseband unit, a plurality of extension units, and a plurality of remote radio units, and in order to implement flexible distribution and miniaturization of the remote radio units, the baseband unit and the remote radio units are separated, and an extension unit is added in the middle, so the remote radio units are also called remote radio units. The base band unit is connected with the extension unit through an optical fiber, and the extension unit is connected with the radio remote unit through a twisted pair (network cable); the extension unit can be connected with a plurality of radio remote units in a downlink mode, and can also be connected with a lower-level extension unit in a cascade mode.
Firstly, a satellite synchronization signal is received through a baseband unit, combined with service data, and converted into an optical signal, so that the optical signal is transmitted in an optical fiber.
Then, the extension unit receives the optical signal transmitted by the baseband unit and converts the optical signal into an electrical signal so that the electrical signal is transmitted in the twisted pair.
And finally, the radio remote unit receives the electric signal, separates and restores the satellite synchronous signal from the electric signal, and transmits the satellite synchronous signal. And after the synchronization equipment receives the satellite synchronization signal, synchronization is realized.
According to the extended pico-cell base station provided by the embodiment of the invention, the transmission of the satellite synchronization signal is realized through the extended pico-cell base station, the transmission link of the extended pico-cell base station is fully utilized, the repeated construction is avoided, the deployment investment is less, and the distribution is flexible; the problem of limitation of the remote distance of the satellite synchronization signal is effectively solved, and an effective solution is provided for equipment and terminals in environments such as long tunnels, large buildings and basements to acquire the satellite synchronization signal.
On the basis of the above embodiment, further, the baseband unit includes a first amplifier, an a/D converter, and a first digital laser;
the first amplifier is used for amplifying the received satellite synchronization signal;
the A/D converter is used for carrying out A/D processing on the satellite synchronization signal after amplification processing;
the first digital laser is used for converting the satellite synchronous signals after A/D processing into optical signals.
Specifically, fig. 3 is a schematic structural diagram of a baseband unit of an extended pico-base station according to an embodiment of the present invention, and as shown in fig. 3, the baseband unit of the extended pico-base station according to the embodiment of the present invention includes a satellite synchronization signal receiving antenna 301, a splitter 302, a satellite synchronization receiving star card 303, a first amplifier 304, an a/D converter 305, a baseband processing module 306, a first FPGA module 307, a time-frequency processing module 308, and a first digital laser 309. It should be noted that fig. 3 is a schematic diagram, and is a preferred embodiment.
The baseband unit in the embodiment of the present invention may not include some components therein, and accordingly, the connection relationship between the components is also different.
First, a satellite synchronization signal is received by the satellite synchronization signal receiving antenna 301, and the satellite synchronization signal receiving antenna 301 transmits the satellite synchronization signal to the first amplifier 304 through the antenna feeder to amplify the received satellite synchronization signal, where the first amplifier 304 is a low noise amplifier.
Then, the satellite synchronization signal after the amplification processing is a/D processed by the a/D converter 305, so that the satellite synchronization signal is converted from an analog signal to a digital signal.
Finally, the satellite synchronization signal after the a/D processing is combined with the service data, the satellite synchronization signal after the a/D processing is converted into an optical signal by the first digital laser 309, and the signal is transmitted to the expansion unit through the optical fiber.
According to the extended pico-cell base station provided by the embodiment of the invention, the transmission of the satellite synchronization signal is realized through the extended pico-cell base station, the transmission link of the extended pico-cell base station is fully utilized, the repeated construction is avoided, the deployment investment is less, and the distribution is flexible; the problem of limitation of the remote distance of the satellite synchronization signal is effectively solved, and an effective solution is provided for equipment and terminals in environments such as long tunnels, large buildings and basements to acquire the satellite synchronization signal.
On the basis of the above embodiments, further, the baseband unit further includes a first FPGA module;
the first FPGA module is used for combining the satellite synchronization signal subjected to A/D processing with service data and assembling the satellite synchronization signal and the service data into a common public radio interface CPRI frame;
and converting the CPRI frame into an optical signal through the first digital laser.
Specifically, as shown in fig. 3, in the embodiment of the present invention, the baseband unit further includes a first FPGA module 307.
Before converting the satellite synchronization signal into the optical signal, the satellite synchronization signal after the a/D processing and the service data are combined by the first FPGA module 307 to be assembled into a common public radio interface CPRI frame, and the CPRI frame is transmitted to the first digital laser 309, and then the CPRI frame is converted into the optical signal by the first digital laser 309 and transmitted to the expansion unit through the optical fiber.
The baseband processing module 306 is a processing core of the base station, and includes a physical layer and a protocol stack content, so as to implement service data access and baseband processing from a core network, and can process 2G, 3G, and 4G mobile communication services according to different base station systems. The FPGA mainly realizes framing and deframing of CPRI, and combines synchronous signal data from the A/D, service baseband data from a baseband processing module, OAM (operation, administration and maintenance) and other channel associated data according to a certain rule in the downlink direction to assemble CPRI frames suitable for optical fiber transmission, wherein the satellite synchronous signals are placed at the fixed positions of the CPRI frames.
According to the extended pico-cell base station provided by the embodiment of the invention, the transmission of the satellite synchronization signal is realized through the extended pico-cell base station, the transmission link of the extended pico-cell base station is fully utilized, the repeated construction is avoided, the deployment investment is less, and the distribution is flexible; the problem of limitation of the remote distance of the satellite synchronization signal is effectively solved, and an effective solution is provided for equipment and terminals in environments such as long tunnels, large buildings and basements to acquire the satellite synchronization signal.
On the basis of the above embodiments, further, the baseband unit further includes a splitter, a satellite synchronous reception star card, and a time-frequency processing module;
the splitter is used for splitting the acquired satellite synchronization signals into two paths;
the first amplifier amplifies one path of satellite synchronous signals;
the satellite synchronous receiving satellite card is used for separating and restoring pulse per second and time information from the other path of satellite synchronous signal;
and the time-frequency processing module is used for outputting a synchronous clock to the A/D converter, the baseband processing module and the FPGA module so that the base station can complete the synchronization of the whole network.
Specifically, as shown in fig. 3, the baseband unit in the embodiment of the present invention further includes a splitter 302, a satellite synchronous reception star card 303, and a time-frequency processing module 308.
The splitter 302 splits the carrier received by the satellite synchronization signal receiving antenna 301, and the first amplifier 304 amplifies one of the satellite synchronization signals to serve as a remote signal source of the synchronization signal to enter a remote processing channel.
The other path of satellite synchronization signal is accessed to the satellite synchronization receiving star card 303, the satellite synchronization receiving star card 303 separates and restores the pulse per second and the time information (1pps + ToD), and transmits the pulse per second and the time information to the time-frequency processing module 308, the time-frequency processing module 308 outputs clock signals of various frequencies required by service processing according to the received 1pps + ToD information as a reference, and simultaneously provides a clock source for sampling the synchronization signal a/D, so that the base station realizes self synchronization, and ensures the synchronization of the satellite synchronization signal sampling.
The clock used in the whole process of transmitting and processing the satellite synchronization signal is synchronous with the synchronous clock obtained by the baseband unit, so that the recovered satellite synchronization signal can not generate frequency offset. The satellite synchronization signals acquired by the covered equipment and terminals can realize frequency synchronization, if accurate time synchronization is required, time compensation needs to be set on the equipment and terminal sides according to the downlink processing time delay of the satellite synchronization signals, and accurate time synchronization can be realized. The downlink processing delay can be measured automatically or manually.
According to the extended pico-cell base station provided by the embodiment of the invention, the transmission of the satellite synchronization signal is realized through the extended pico-cell base station, the transmission link of the extended pico-cell base station is fully utilized, the repeated construction is avoided, the deployment investment is less, and the distribution is flexible; the problem of limitation of the remote distance of the satellite synchronization signal is effectively solved, and an effective solution is provided for equipment and terminals in environments such as long tunnels, large buildings and basements to acquire the satellite synchronization signal.
On the basis of the above embodiments, further, the extension unit includes a second digital laser and a second FPGA module:
the second digital laser is used for receiving the optical signal and converting the optical signal into an electrical signal;
the second FPGA module is configured to assemble the electrical signals into Ethernet frames.
Specifically, fig. 4 is a schematic structural diagram of an extension unit of an extended pico-base station according to an embodiment of the present invention, and as shown in fig. 4, the extension unit of the base station according to the embodiment of the present invention includes a second digital laser 401, a second FPGA module 402, a first physical layer (PHY) interface 403, a cascaded digital laser 404, and a PSE module 405. It should be noted that fig. 4 is a schematic diagram, and is a preferred embodiment.
The extension unit in the embodiment of the present invention may not include some components therein, and accordingly, the connection relationship between the components is different.
In the downstream direction, first, the second digital laser 401 acquires an optical signal from the baseband unit through an optical fiber.
The optical signal is then converted to an electrical signal by the second digital laser 401 and the electrical signal is transmitted to the second FPGA module 402.
Finally, the second FPGA module 402 copies a copy of data and forwards the data to the cascaded digital laser 404 for cascade forwarding, and sends the data to the lower-level extension unit.
For the downlink processing link, the second FPGA module 402 deframes the CPRI signal, separates out OAM or other associated data required by the extension unit, frames the service data, the satellite synchronization signal data, and OAM data of the remote unit according to the ethernet frame format required by the network cable transmission, and sends to the ethernet PHY interface 403. The PHY interface 403 completes data transceiving to each downlink port, and the data transceiving uses a channel associated clock extracted from the downlink data by the second FPGA module 402 to achieve synchronization between each unit.
The PSE module 405 feeds 48V dc into pins defined by the standard POE line sequence in each downlink port, and supplies power to the downlink rf expansion unit through the network cable.
In the uplink direction, the second FPGA module 402 completes the deframing of the ethernet frame and the framing of the CPRI frame.
According to the extended pico-cell base station provided by the embodiment of the invention, the transmission of the satellite synchronization signal is realized through the extended pico-cell base station, the transmission link of the extended pico-cell base station is fully utilized, the repeated construction is avoided, the deployment investment is less, and the distribution is flexible; the problem of limitation of the remote distance of the satellite synchronization signal is effectively solved, and an effective solution is provided for equipment and terminals in environments such as long tunnels, large buildings and basements to acquire the satellite synchronization signal.
On the basis of the above embodiments, further, the radio remote unit includes a physical layer interface, a third FPGA module, a D/a converter, a second amplifier, a filter, and a radio antenna;
the physical layer interface is used for receiving the electric signal;
the third FPGA module is used for separating and restoring the satellite synchronization signal from the electric signal;
the D/A converter is used for carrying out D/A processing on the satellite synchronization signal;
the second amplifier is used for amplifying the satellite synchronous signals after the D/A processing;
the filter is used for filtering the satellite synchronous signals after amplification processing;
and the radio frequency antenna is used for transmitting the satellite synchronization signal after filtering processing.
Specifically, fig. 5 is a schematic structural diagram of a radio remote unit of an extended pico-base station according to an embodiment of the present invention, and as shown in fig. 5, the radio remote unit of the base station according to the embodiment of the present invention includes a second PHY interface 501, a third FPGA module 502, a D/a (a/D) converter 503, a third amplifier 504, a first filter 505, a D/a converter 506, a second amplifier 507, a second filter 508, a combiner 509, a POE power processing module 510, a broadband coverage antenna 511, and an independent coverage antenna 512. It should be noted that fig. 5 is a schematic diagram, and is a preferred embodiment.
The remote radio unit in the embodiment of the present invention may not include some components therein, and accordingly, the connection relationship between the components is different.
First, the third FPGA module 502 receives ethernet data from the extension unit from the PHY interface 501, deframes it, and then separates the satellite synchronization signal from the traffic data.
Then, the service data is transmitted to a D/a (a/D) converter 503, amplified by a third amplifier 504, filtered by a first filter 505 (a duplexer for frequency division), and finally transmitted through a broadband coverage antenna 511. The operating frequency band of the first filter 505 corresponds to the frequency band of the mobile communication signal.
The third FPGA module 502 transmits the separated satellite synchronization signal to the D/a converter 506, and recovers a synchronization carrier signal.
After the D/a converter 506 restores the synchronous carrier signal, the signal is amplified by the second amplifier 507, filtered by the second filter 508, and finally transmitted by the independent coverage antenna 512. Wherein the operating frequency band of the second amplifier 507 and the second filter 508 corresponds to the satellite synchronization signal frequency band.
In addition, the service data and the satellite synchronization signal may be combined by the combiner 509, and then the combined data may be transmitted by the broadband coverage antenna 511. In this case, the broadband coverage antenna 511 should support both the mobile communication signal band and the satellite synchronization signal band, and the separate coverage antenna 512 is not installed.
According to the extended pico-cell base station provided by the embodiment of the invention, the transmission of the satellite synchronization signal is realized through the extended pico-cell base station, the transmission link of the extended pico-cell base station is fully utilized, the repeated construction is avoided, the deployment investment is less, and the distribution is flexible; the problem of limitation of the remote distance of the satellite synchronization signal is effectively solved, and an effective solution is provided for equipment and terminals in environments such as long tunnels, large buildings and basements to acquire the satellite synchronization signal.
Fig. 6 is a schematic structural diagram of an electronic device according to an embodiment of the present invention, and as shown in fig. 6, the electronic device includes: a processor 601, a memory 602, and a bus 603;
wherein, the processor 601 and the memory 602 complete the communication with each other through the bus 603;
the baseband unit receives the satellite synchronization signal, combines the satellite synchronization signal with the service data, and converts the satellite synchronization signal into an optical signal so as to transmit the optical signal in an optical fiber;
the extension unit receives the optical signal and converts the optical signal into an electrical signal so that the electrical signal is transmitted in a twisted pair;
and the radio remote unit receives the electric signal, separates and restores the satellite synchronization signal from the electric signal, and transmits the satellite synchronization signal.
Embodiments of the present invention provide a computer program product comprising a computer program stored on a non-transitory computer-readable storage medium, the computer program comprising program instructions that, when executed by a computer, enable the computer to perform the methods provided by the above-mentioned method embodiments, for example, including:
the baseband unit receives the satellite synchronization signal, combines the satellite synchronization signal with the service data, and converts the satellite synchronization signal into an optical signal so as to transmit the optical signal in an optical fiber;
the extension unit receives the optical signal and converts the optical signal into an electrical signal so that the electrical signal is transmitted in a twisted pair;
and the radio remote unit receives the electric signal, separates and restores the satellite synchronization signal from the electric signal, and transmits the satellite synchronization signal.
Embodiments of the present invention provide a non-transitory computer-readable storage medium, which stores computer instructions, where the computer instructions cause the computer to perform the methods provided by the above method embodiments, for example, the methods include:
the baseband unit receives the satellite synchronization signal, combines the satellite synchronization signal with the service data, and converts the satellite synchronization signal into an optical signal so as to transmit the optical signal in an optical fiber;
the extension unit receives the optical signal and converts the optical signal into an electrical signal so that the electrical signal is transmitted in a twisted pair;
and the radio remote unit receives the electric signal, separates and restores the satellite synchronization signal from the electric signal, and transmits the satellite synchronization signal.
Those of ordinary skill in the art will understand that: all or part of the steps for implementing the method embodiments may be implemented by hardware related to program instructions, and the program may be stored in a computer readable storage medium, and when executed, the program performs the steps including the method embodiments; and the aforementioned storage medium includes: various media that can store program codes, such as ROM, RAM, magnetic or optical disks.
The above-described embodiments of the apparatuses and devices are merely illustrative, where the units described as separate parts may or may not be physically separate, and the parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment. One of ordinary skill in the art can understand and implement it without inventive effort.
Through the above description of the embodiments, those skilled in the art will clearly understand that each embodiment can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware. With this understanding in mind, the above-described technical solutions may be embodied in the form of a software product, which can be stored in a computer-readable storage medium such as ROM/RAM, magnetic disk, optical disk, etc., and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute the methods described in the embodiments or some parts of the embodiments.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (8)
1. A method for transmitting a satellite synchronization signal at an extended pico base station, comprising:
the baseband unit receives the satellite synchronization signal, combines the satellite synchronization signal with the service data, and converts the satellite synchronization signal into an optical signal so as to transmit the optical signal in an optical fiber;
the extension unit receives the optical signal and converts the optical signal into an electrical signal so that the electrical signal is transmitted in a twisted pair;
the radio remote unit receives the electric signal, separates and restores the satellite synchronous signal from the electric signal, and transmits the satellite synchronous signal;
the receiving of the satellite synchronization signal, combining with the service data, and converting into an optical signal specifically includes:
receiving a satellite synchronization signal;
amplifying the received satellite synchronization signal;
carrying out A/D processing on the amplified satellite synchronization signal;
merging the satellite synchronous signal after the A/D processing with the service data, and converting the merged signal into an optical signal;
the amplifying processing of the received satellite synchronization signal specifically includes:
dividing the acquired satellite synchronization signal into two paths;
amplifying one path of satellite synchronization signal;
and separating and restoring the pulse per second and the time information from the other path of satellite synchronization signal, and realizing the whole network synchronization of the base station according to the pulse per second and the time information.
2. The method according to claim 1, wherein the combining the a/D processed satellite synchronization signal with the service data and then converting the combined signal into an optical signal comprises:
combining the satellite synchronous signals after A/D processing with service data to assemble common public radio interface CPRI frames;
and converting the CPRI frame into an optical signal.
3. The method according to claim 1, wherein the receiving the optical signal and converting the optical signal into an electrical signal comprises:
receiving the optical signal and converting the optical signal into an electrical signal;
the electrical signals are assembled into Ethernet frames.
4. The method according to claim 1, wherein said receiving said electrical signal, separating and recovering said satellite synchronization signal therefrom, and transmitting said satellite synchronization signal comprises:
receiving the electrical signal;
separating and recovering the satellite synchronization signal from the electric signal;
D/A processing is carried out on the satellite synchronous signal;
amplifying the satellite synchronous signals subjected to the D/A processing;
filtering the amplified satellite synchronization signal;
and transmitting the satellite synchronization signal after filtering processing through a radio frequency antenna.
5. An extended pico base station, comprising:
the baseband unit is used for receiving the satellite synchronization signal, merging the satellite synchronization signal with the service data and converting the satellite synchronization signal into an optical signal so as to transmit the optical signal in an optical fiber;
the extension unit is used for receiving the optical signal and converting the optical signal into an electrical signal so that the electrical signal is transmitted in a twisted pair;
the radio frequency remote unit is used for receiving the electric signal, separating and restoring the satellite synchronous signal from the electric signal and transmitting the satellite synchronous signal;
the baseband unit comprises a first amplifier, an A/D converter and a first digital laser;
the first amplifier is used for amplifying the received satellite synchronization signal;
the A/D converter is used for carrying out A/D processing on the satellite synchronization signal after amplification processing;
the first digital laser is used for converting the satellite synchronous signals subjected to A/D processing into optical signals;
the amplifying processing of the received satellite synchronization signal specifically includes:
dividing the acquired satellite synchronization signal into two paths;
amplifying one path of satellite synchronization signal;
and separating and restoring the pulse per second and the time information from the other path of satellite synchronization signal, and realizing the whole network synchronization of the base station according to the pulse per second and the time information.
6. The base station of claim 5, wherein the baseband unit further comprises a first FPGA module;
the first FPGA module is used for combining the satellite synchronization signal subjected to A/D processing with service data and assembling the satellite synchronization signal and the service data into a common public radio interface CPRI frame;
and converting the CPRI frame into an optical signal through the first digital laser.
7. An electronic device, comprising:
the processor and the memory are communicated with each other through a bus; the memory stores program instructions executable by the processor, the processor invoking the program instructions to perform the method of any of claims 1 to 4.
8. A non-transitory computer-readable storage medium having stored thereon a computer program, which, when executed by a processor, implements the method of any one of claims 1 to 4.
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| CN110278572A (en) * | 2019-06-24 | 2019-09-24 | 京信通信系统（中国）有限公司 | Data transmission method, main computer unit, expanding element and base station system |
| WO2023087304A1 (en) * | 2021-11-22 | 2023-05-25 | 上海华为技术有限公司 | Data processing method and related apparatus |
| CN114567368A (en) * | 2022-02-18 | 2022-05-31 | 中国电子科技集团公司第五十四研究所 | Multi-user concurrent access equipment of heaven-earth system and communication method thereof |
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