CN107528669B - Data transmission method and microwave transmission device - Google Patents
Data transmission method and microwave transmission device Download PDFInfo
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- CN107528669B CN107528669B CN201610460060.0A CN201610460060A CN107528669B CN 107528669 B CN107528669 B CN 107528669B CN 201610460060 A CN201610460060 A CN 201610460060A CN 107528669 B CN107528669 B CN 107528669B
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Abstract
The invention discloses a data transmission method, which comprises the following steps: when receiving interface data of a second terminal which is a target terminal transmitted by a first terminal, the first microwave transmission device carries out SerDes decoding processing on the interface data; framing the decoded interface data by the first microwave transmission device to obtain a first data frame, and modulating the first data frame; the first microwave transmission device transmits the modulated first data frame outwards through a microwave antenna, so that after the second microwave transmission device receives and demodulates the first data frame, the second microwave transmission device extracts decoded interface data carried by the first data frame through de-framing, and transmits the decoded interface data to a second terminal after performing SerDes coding on the decoded interface data. The invention also discloses a microwave transmission device. The invention can improve the data transmission efficiency between the BBU and the RRU.
Description
Technical Field
The present invention relates to the field of communications technologies, and in particular, to a data transmission method and a microwave transmission apparatus.
Background
In a base station system of wireless communication, data transmission between a BBU (Building base band Unit) and an RRU (Remote Radio Unit) generally uses a CPRI (Common Public Radio Interface)/IR (Interface between the RRU and the BBU, Interface between the indoor Baseband processing Unit and the Remote Radio Unit) or an OBSAI (Open base station) Interface, and physical ports thereof all perform data transmission through optical fibers. However, in practical applications, the distance between the BBU and the RRU may be forty kilometers away, which often makes it difficult to install optical fibers, and even if the installation is possible, the cost is often too high.
In order to solve the problem of data transmission between the BBU and the RRU in the prior art, the CPRI interface is usually analyzed, and then the dead load is transmitted through a microwave system, and huge hardware resource overhead is required for analyzing the CPRI interface and reconstructing the CPRI interface, and meanwhile, the processing delay is large, so that the data transmission efficiency between the BBU and the RRU is low.
Disclosure of Invention
The invention mainly aims to provide a data transmission method and a microwave transmission device, and aims to improve the data transmission efficiency between a BBU (base band unit) and a RRU (remote radio unit).
In order to achieve the above object, the present invention provides a data transmission method, including:
when receiving interface data of a second terminal which is a target terminal and transmitted by a first terminal, a first microwave transmission device performs serializer/deserializer SerDes decoding processing on the interface data, wherein the first terminal is a BBU (base band Unit) and the second terminal is an RRU (remote radio unit), or the first terminal is an RRU and the second terminal is a BBU;
the first microwave transmission device frames the decoded interface data to obtain a first data frame, and modulates the first data frame;
and the first microwave transmission device transmits the modulated first data frame outwards through a microwave antenna, so that after the second microwave transmission device receives and demodulates the first data frame, the second microwave transmission device extracts the decoded interface data carried by the first data frame through de-framing, performs SerDes coding on the decoded interface data and transmits the decoded interface data to a second terminal.
Optionally, the modulation processing of the first data frame by the first microwave transmission device includes:
the first microwave transmission device modulates the first data frame to obtain a first intermediate frequency signal;
the first microwave transmission device transmits the modulated first data frame to the outside through a microwave antenna, and the method comprises the following steps:
and the first microwave transmission device up-converts the first intermediate frequency signal to obtain a first radio frequency signal and transmits the first radio frequency signal to the outside through a microwave antenna.
Optionally, the data transmission method further includes:
when receiving a second radio frequency signal transmitted by the second microwave transmission device, the first microwave transmission device down-converts the received second radio frequency signal to obtain a second intermediate frequency signal;
the first microwave transmission device demodulates the second intermediate frequency signal to obtain a second data frame, and unframes and extracts interface data carried by the second data frame, wherein a target terminal transmitted to the second microwave transmission device by the second terminal is the first terminal;
and the first microwave transmission device carries out SerDes coding on the extracted interface data and then transmits the interface data to the first terminal.
Optionally, after the step of performing data transmission between the first microwave transmission device and the first terminal based on an optical port, where the first microwave transmission device transmits the modulated first data frame to the outside through a microwave antenna, the method further includes:
the first microwave transmission device receives the packet loss rate returned by the second microwave transmission device based on the reception and demodulation of the first data frame;
the first microwave transmission device adjusts the line rate of the optical port according to the size relationship between the packet loss rate and a preset threshold value, wherein,
when the packet loss rate is greater than the preset threshold, the first microwave transmission device reduces the line rate of the optical port;
and when the packet loss rate is smaller than the preset threshold value, the first microwave transmission device increases the line rate of the optical port.
Optionally, the first data frame includes a frame header and a payload, and the frame header includes:
e1 bandwidth for identifying the number of ways of E1 data in the payload;
the STM-1 bandwidth is used for identifying the flow of STM-1 data in the payload;
and the interface bandwidth is used for identifying the flow of the interface data in the payload.
In addition, to achieve the above object, the present invention also provides a microwave transmission device, including:
the indoor processing module is used for carrying out SerDes decoding processing on interface data when receiving the interface data which is transmitted by a first terminal and is transmitted by a target terminal and is a second terminal, wherein the first terminal is a BBU (base band unit) and the second terminal is an RRU (remote radio unit), or the first terminal is an RRU and the second terminal is a BBU; and
framing the decoded interface data to obtain a first data frame, and modulating the first data frame;
and the outdoor processing module is used for transmitting the modulated first data frame outwards through a microwave antenna so that a second microwave transmission device can extract decoded interface data carried by the first data frame after receiving and demodulating the first data frame, and the decoded interface data is subjected to SerDes encoding and then is transmitted to a second terminal.
Optionally, the indoor processing module is further configured to modulate the first data frame to obtain a first intermediate frequency signal;
the outdoor processing module is also used for up-converting the first intermediate frequency signal to obtain a first radio frequency signal and then transmitting the first radio frequency signal to the outside through a microwave antenna.
Optionally, the outdoor processing module is further configured to down-convert the received second radio frequency signal to obtain a second intermediate frequency signal when receiving the second radio frequency signal transmitted by the second microwave transmission device;
the indoor processing module is further configured to demodulate the second intermediate-frequency signal to obtain a second data frame, and extract, by frame decoding, interface data carried by the second data frame, where a target terminal transmitted by the second terminal to the second microwave transmission device is a first terminal; and
and carrying out SerDes coding on the extracted interface data and then transmitting the interface data to the first terminal.
Optionally, the microwave transmission device and the first terminal perform data transmission based on an optical interface, and the indoor processing module is further configured to receive a packet loss rate returned by the second microwave transmission device based on the reception and demodulation of the first data frame by the second microwave transmission device; and
adjusting the line rate of the optical port according to the size relationship between the packet loss rate and a preset threshold value, wherein,
when the packet loss rate is greater than the preset threshold value, reducing the line rate of the optical port;
and when the packet loss rate is smaller than the preset threshold value, increasing the line rate of the optical port.
Optionally, the first data frame includes a frame header and a payload, and the frame header includes:
e1 bandwidth for identifying the number of ways of E1 data in the payload;
the STM-1 bandwidth is used for identifying the flow of STM-1 data in the payload;
and the interface bandwidth is used for identifying the flow of the interface data in the payload.
Compared with the prior art, the data transmission method and the microwave transmission device provided by the invention do not unseal and analyze the interface data between the BBU and the RRU, but directly use the interface data as the packaged SerDes interface data, perform microwave transmission after framing by the microwave transmission device connected with the sending end, further perform unframing by other microwave transmission devices connected with the receiving end to extract the SerDes interface data, and transmit the SerDes interface data to the receiving end connected with the microwave transmission device through the SerDes, thereby realizing high-efficiency data transmission between the BBU and the RRU.
Drawings
Fig. 1 is a schematic flow chart of a data transmission method according to a first embodiment of the present invention;
FIG. 2 is a diagram of an example of a frame format in a first embodiment of a data transmission method according to the present invention;
fig. 3 is a functional block diagram of a microwave transmission device according to a first embodiment of the present invention.
The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.
Detailed Description
It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The present invention provides a data transmission method, and referring to fig. 1, in a first embodiment of the data transmission method of the present invention, the data transmission method includes the steps of:
step S10, when receiving interface data of a second terminal as a target terminal transmitted by a first terminal, a first microwave transmission device performs SerDes decoding processing on the interface data, wherein the first terminal is a BBU and the second terminal is an RRU, or the first terminal is an RRU and the second terminal is a BBU;
it should be noted that, in a base station system for wireless communication, data transmission between the BBU and the RRU generally uses a CPRI/IR or OBSAI interface. Taking the CPRI interface adopted by the BBU and the RRU as an example, when the data transmission method provided by the present embodiment is adopted, transmission of CPRI interface data can be realized without splitting and reconstructing the CPRI interface data. Since the BBU may be connected to multiple RRUs simultaneously, for convenience of description, the following describes a data transmission method provided in this embodiment by using a first terminal as the BBU and a second terminal as a specific RRU, and using a CPRI interface between the BBU and the specific RRU.
Specifically, in the embodiment of the present invention, the BBU and the first microwave transmission device are connected by an optical fiber, and when the BBU has data to be transmitted, CPRI interface data to be transmitted is directly transmitted to the first microwave transmission device through an optical interface between the BBU and the first microwave transmission device.
When receiving the CPRI interface data transmitted by the BBU, the first microwave transmission device first performs SerDes decoding processing on the received CPRI interface data. Wherein SerDes is an abbreviation of SERializer/DESerializer. The method is a mainstream Time Division Multiplexing (TDM) and point-to-point (P2P) serial communication technology, namely, a plurality of low-speed parallel signals are converted into high-speed serial signals at a transmitting end, the high-speed serial signals are converted into the low-speed parallel signals again at a receiving end through a transmission medium (optical fiber or copper wire). The point-to-point serial communication technology fully utilizes the channel capacity of a transmission medium, reduces the number of required transmission channels and device pins, and improves the transmission speed of signals, thereby greatly reducing the communication cost.
SerDes structures can be broadly divided into four categories:
parallel clock SerDes: the parallel wide bus is serialized into a plurality of differential signal pairs, carrying a clock in parallel with the data. These SerDes are relatively inexpensive, and in applications where multiple SerDes are required to be used simultaneously, the bus can be effectively extended over a cable or backplane;
8B/10B encodes a SerDes: each data byte is mapped to a 10-bit code and then serialized into a single signal pair. The 10-bit code is defined as follows: sufficient conversion is provided for receiver clock recovery and dc-balancing is ensured (i.e. equal numbers of '1's and '0's are transmitted). These properties enable 8B/10BSerDes to operate at high speeds with less signal distortion in lossy interconnects and fiber transmission;
embedded clock SerDes: the data bus and clock are serialized into a serial signal pair. Two clock bits, one high and one low, embed the serial data stream in each clock cycle, frame the beginning and end of each serialized word, so this type of SerDes may also be referred to as a "start-end bit SerDes," and establish a periodic rising edge in the serial stream. Because the payload is sandwiched between embedded clock bits, the data payload word width is not limited to multiples of bytes;
bit-interleaved SerDes: bits in multiple input serial streams are aggregated into faster serial signal pairs.
For example, the CPRI interface data at 1.2288Gbps line rate has a payload of 1.2288 × 0.8 to 0.98304Gbps after 8B/10B decoding.
Step S20, framing the decoded interface data by the first microwave transmission device to obtain a first data frame, and modulating the first data frame;
after decoding the received CPRI interface data to obtain a payload to be transmitted, the first microwave transmission device frames the payload to be transmitted to obtain a first data frame. Referring to fig. 2, the first data frame framed by the first microwave transmission device includes a header, a payload, padding data, and frame CRC (Cyclic Redundancy Check) Check data.
Wherein, the frame header includes 32 bit data, respectively:
synchronization bits, 8 bits in total;
e1 bandwidth, 8 bits in total, for identifying the path number of E1 data in the payload;
the bandwidth of STM-1 is 4 bits in total and is used for identifying the flow of STM-1 data in a payload;
interface bandwidth, totally 4 bits, for identifying the traffic of CPRI interface data in payload;
and the frame header CRC check data, which has 8 bits in total, is used for the CRC check of the frame header.
And filling the filling data in real time according to the length of the required framing.
The frame CRC check data is used for CRC checking of the first data frame.
For example, the transmission bandwidth of the first microwave transmission device is 112MHz, and the Modulation scheme is 2048QAM (Quadrature Amplitude Modulation), the maximum throughput supported by the first microwave transmission device is 1.0568214Gbps, the payload after CPRI interface data with a line rate of 1.2288Gbps is decoded by 8B/10B is 1.2288 × 0.8 — 0.98304Gbps, and the frame length of the first data frame can be designed to be 0.372588933ms during framing.
After framing the payload to be transmitted to obtain a first data frame, the first microwave transmission device modulates the framed first data frame for sending.
Step S30, the first microwave transmission device transmits the modulated first data frame to the outside through the microwave antenna, so that the second microwave transmission device extracts the decoded interface data carried by the first data frame after receiving and demodulating the first data frame, and transmits the decoded interface data to the second terminal after performing SerDes encoding on the decoded interface data.
After the modulation processing of the first data frame is completed, the first microwave transmission device transmits the modulated first data frame to the outside through the microwave antenna.
It should be noted that, in this embodiment, the RRU is also connected to the second microwave transmission device through the optical fiber, and when the second microwave transmission device receives the modulated first data frame transmitted by the first microwave transmission device, the second microwave transmission device first demodulates the first data frame; then, performing de-framing processing on the demodulated first data frame to obtain decoded CPRI interface data; and finally, carrying out SerDes coding on the decoded CPRI data and transmitting the CPRI data to the RRU connected with the optical fiber of the CPRI data, thus realizing data transmission between the BBU and the RRU.
Compared with the prior art, the data transmission method provided by the embodiment does not unseal and analyze the interface data between the BBU and the RRU, but directly uses the interface data as the packaged SerDes interface data, performs microwave transmission after framing by the microwave transmission device connected with the sending end, performs de-framing by other microwave transmission devices connected with the receiving end to extract the SerDes interface data, and transmits the SerDes interface data to the receiving end connected with the microwave transmission device through the SerDes, thereby realizing high-efficiency data transmission between the BBU and the RRU.
Further, based on the first embodiment, a second embodiment of the data transmission method of the present invention is provided, in this embodiment, the step S20 of performing modulation processing on the first data frame by the first microwave transmission device includes:
the first microwave transmission device modulates the first data frame to obtain a first intermediate frequency signal;
step S30 includes:
and the first microwave transmission device up-converts the first intermediate frequency signal to obtain a first radio frequency signal and transmits the first radio frequency signal to the outside through a microwave antenna.
It should be noted that, in this embodiment, based on the first embodiment, modulation and transmission of the first data frame are further described, and other references may be made to the first embodiment, which is not described herein again.
It will be understood by those skilled in the art that when the first data frame is transmitted, if the first data frame is directly modulated to a radio frequency signal for transmission, a higher performance mixer is required for implementation, and the higher performance usually means higher hardware cost.
In view of this, in this embodiment, in order to implement data transmission between the BBU and the RRU on the premise of lower hardware cost, after framing the first data frame, the first microwave transmission device modulates the first data frame by a built-in mixer with ordinary performance to obtain the first intermediate frequency signal.
After the first intermediate frequency signal is obtained through modulation, the first microwave transmission device up-converts the first intermediate frequency signal into a first radio frequency signal and transmits the first radio frequency signal to the outside through a microwave antenna.
Further, based on the second embodiment, a third embodiment of the data transmission method of the present invention is provided, in this embodiment, the data transmission method further includes:
when receiving a second radio frequency signal transmitted by the second microwave transmission device, the first microwave transmission device down-converts the received second radio frequency signal to obtain a second intermediate frequency signal;
the first microwave transmission device demodulates the second intermediate frequency signal to obtain a second data frame, and unframes and extracts interface data carried by the second data frame, wherein a target terminal transmitted to the second microwave transmission device by the second terminal is the first terminal;
and the first microwave transmission device carries out SerDes coding on the extracted interface data and then transmits the interface data to the first terminal.
It should be noted that, in this embodiment, on the basis of the second embodiment, description of receiving RRU transmission data by the BBU is further added, and other details may refer to the foregoing embodiments and are not described here again.
In this embodiment, when the RRU needs to transmit data to the BBU, referring to the second embodiment, a second microwave transmission device connected to the RRU converts CPRI interface data to be transmitted of the RRU into a second radio frequency signal to be transmitted.
When receiving a second radio frequency signal transmitted by a second microwave transmission device, the first microwave transmission device firstly down-converts the received second radio frequency signal to obtain a second intermediate frequency signal; then, demodulating the second intermediate frequency signal to obtain a second data frame carrying CPRI interface data to be sent from the RRU to the BBU; and finally, deframing and extracting CPRI interface data carried by the second data frame, and transmitting the extracted CPRI interface data to a BBU connected with the CPRI interface data after performing SerDes coding on the extracted CPRI interface data.
Further, based on any one of the foregoing embodiments, a fourth embodiment of the data transmission method according to the present invention is provided, in this embodiment, the first microwave transmission device and the first terminal perform data transmission based on an optical port, and after step S30, the method further includes:
the first microwave transmission device receives the packet loss rate returned by the second microwave transmission device based on the reception and demodulation of the first data frame;
the first microwave transmission device adjusts the line rate of the optical port according to the size relationship between the packet loss rate and a preset threshold value, wherein,
when the packet loss rate is greater than the preset threshold, the first microwave transmission device reduces the line rate of the optical port;
and when the packet loss rate is smaller than the preset threshold value, the first microwave transmission device increases the line rate of the optical port.
It should be noted that, in this embodiment, on the basis of the foregoing embodiment, the line rate of the optical port between the BBU and the microwave transmission apparatus is dynamically configured, and only this difference is described below, and other parts may refer to the foregoing embodiments, which are not described herein again.
As will be understood by those skilled in the art, during transmission, there will be a certain degree of attenuation along with the increase of the distance of the radio frequency signal, and furthermore, mountains, buildings, etc. will also cause a certain degree of blocking to the radio frequency signal, so that there will be a certain degree of packet loss in the first data frame received by the second microwave transmission apparatus connected to the RRU. In this embodiment, the packet loss rate is used to represent the frequency of packet loss occurring within a preset unit time. The preset unit time may be set according to actual needs, and this embodiment is not particularly limited, and may be set to 5 minutes, for example.
In this embodiment, the second microwave transmission device performs statistics on the condition that the second microwave transmission device receives the first data frame, obtains a packet loss rate of the received first data frame, and sends the statistical packet loss rate to the first microwave transmission device connected to the BBU.
After receiving the packet loss rate returned by the second microwave transmission device, the first microwave transmission device judges whether the received packet loss rate is greater than a preset threshold value; when the packet loss rate is greater than the preset threshold value, the first microwave transmission device reduces the line rate of an optical port between the first microwave transmission device and the BBU; when the packet loss rate is smaller than the preset threshold value, the first microwave transmission device increases the line rate of an optical port between the first microwave transmission device and the BBU; and when the packet loss rate is equal to the preset threshold value, the first microwave transmission device maintains the line rate of the current optical port.
The preset threshold is set according to actual needs, and this embodiment is not particularly limited, for example, the preset threshold is set to 10 times/minute, that is, packet loss is allowed to occur 10 times within one minute; the line rates of the configurable optical ports include 1.2288Gbps, 2.4576Gbps, 3.072Gbps, 4.9152Gbps, 6.144Gbps, 8.11008Gbps, 9.8304Gbps, and the like.
In the embodiment, the line rate of the optical port between the BBU and the microwave transmission device is dynamically adjusted, so that the packet loss rate of data transmission between the BBU and the RRU can be controlled within a reasonable range, and the quality of data transmission between the BBU and the RRU is effectively improved.
The present invention also provides a microwave transmission device for executing the aforementioned data transmission method, and referring to fig. 3, corresponding to the first embodiment of the aforementioned data transmission method, in the first embodiment of the microwave transmission device of the present invention, the microwave transmission device includes:
an indoor processing module 10, configured to perform SerDes decoding processing on interface data when receiving the interface data, which is transmitted by a first terminal and whose target terminal is a second terminal, where the first terminal is a BBU and the second terminal is an RRU, or the first terminal is an RRU and the second terminal is a BBU; and
framing the decoded interface data to obtain a first data frame, and modulating the first data frame;
and the outdoor processing module 20 is configured to transmit the modulated first data frame to the outside through a microwave antenna, so that after the second microwave transmission device receives and demodulates the first data frame, the second microwave transmission device extracts decoded interface data carried by the first data frame by de-framing, performs SerDes encoding on the decoded interface data, and transmits the encoded interface data to the second terminal.
It should be noted that, in a base station system for wireless communication, data transmission between the BBU and the RRU generally uses a CPRI/IR or OBSAI interface. Taking the CPRI interface adopted by the BBU and the RRU as an example, the microwave transmission apparatus provided in this embodiment can implement transmission of CPRI interface data without splitting and reconstructing the CPRI interface data. For convenience of description, the first terminal is used as the BBU connected to the first microwave transmission apparatus, the second terminal is a specific RRU connected to the second microwave transmission apparatus, and a CPRI interface is used between the BBU and the specific RRU to explain the data transmission method provided in this embodiment.
Specifically, in the embodiment of the present invention, the BBU and the first microwave transmission device are connected by an optical fiber, and when the BBU has data to be transmitted, CPRI interface data to be transmitted is directly transmitted to the first microwave transmission device through an optical interface between the BBU and the first microwave transmission device.
When the first microwave transmission device receives the CPRI interface data transmitted by the BBU, the indoor processing module 10 performs SerDes decoding processing on the received CPRI interface data. Wherein SerDes is an abbreviation of SERializer/DESerializer. The method is a mainstream Time Division Multiplexing (TDM) and point-to-point (P2P) serial communication technology, namely, a plurality of low-speed parallel signals are converted into high-speed serial signals at a transmitting end, the high-speed serial signals are converted into the low-speed parallel signals again at a receiving end through a transmission medium (optical fiber or copper wire). The point-to-point serial communication technology fully utilizes the channel capacity of a transmission medium, reduces the number of required transmission channels and device pins, and improves the transmission speed of signals, thereby greatly reducing the communication cost.
SerDes structures can be broadly divided into four categories:
parallel clock SerDes: the parallel wide bus is serialized into a plurality of differential signal pairs, carrying a clock in parallel with the data. These SerDes are relatively inexpensive, and in applications where multiple SerDes are required to be used simultaneously, the bus can be effectively extended over a cable or backplane;
8B/10B encodes a SerDes: each data byte is mapped to a 10-bit code and then serialized into a single signal pair. The 10-bit code is defined as follows: sufficient conversion is provided for receiver clock recovery and dc-balancing is ensured (i.e. equal numbers of '1's and '0's are transmitted). These properties enable 8B/10BSerDes to operate at high speeds with less signal distortion in lossy interconnects and fiber transmission;
embedded clock SerDes: the data bus and clock are serialized into a serial signal pair. Two clock bits, one high and one low, embed the serial data stream in each clock cycle, frame the beginning and end of each serialized word, so this type of SerDes may also be referred to as a "start-end bit SerDes," and establish a periodic rising edge in the serial stream. Because the payload is sandwiched between embedded clock bits, the data payload word width is not limited to multiples of bytes;
bit-interleaved SerDes: bits in multiple input serial streams are aggregated into faster serial signal pairs.
For example, the CPRI interface data at 1.2288Gbps line rate has a payload of 1.2288 × 0.8 to 0.98304Gbps after 8B/10B decoding.
After decoding the received CPRI interface data to obtain a payload to be transmitted, the indoor processing module 10 frames the payload to be transmitted to obtain a first data frame. Referring to fig. 2, a first data frame obtained by framing by the indoor processing module 10 includes a frame header, a payload, padding data, and frame CRC (Cyclic Redundancy Check) Check data.
Wherein, the frame header includes 32 bit data, respectively:
synchronization bits, 8 bits in total;
e1 bandwidth, 8 bits in total, for identifying the path number of E1 data in the payload;
the bandwidth of STM-1 is 4 bits in total and is used for identifying the flow of STM-1 data in a payload;
interface bandwidth, totally 4 bits, for identifying the traffic of CPRI interface data in payload;
and the frame header CRC check data, which has 8 bits in total, is used for the CRC check of the frame header.
And filling the filling data in real time according to the length of the required framing.
The frame CRC check data is used for CRC checking of the first data frame.
For example, the transmission bandwidth of the microwave transmission device is 112MHz, and the Modulation scheme 2048QAM (Quadrature Amplitude Modulation) supports the maximum throughput of 1.0568214Gbps, where the deadload 1.2288 × 0.8 is 0.98304Gbps after CPRI interface data at 1.2288Gbps line rate is decoded by 8B/10B, and the indoor processing module 10 may design the frame length of the first data frame as 0.372588933ms during framing.
After framing the payload to be transmitted to obtain a first data frame, the indoor processing module 10 modulates the first data frame obtained by framing for sending.
After the modulation processing of the first data frame is completed, the indoor processing module 10 transmits the modulated first data frame to the outdoor processing module 20, and the modulated first data frame is transmitted outwards by the outdoor processing module 20 through the microwave antenna.
It should be noted that, in this embodiment, the RRU is also connected to the second microwave transmission device through the optical fiber, and when the second microwave transmission device receives the modulated first data frame transmitted by the first microwave transmission device, the second microwave transmission device first demodulates the first data frame; then, performing de-framing processing on the demodulated first data frame to obtain decoded CPRI interface data; and finally, carrying out SerDes coding on the decoded CPRI data and transmitting the CPRI data to the RRU connected with the optical fiber of the CPRI data, thus realizing data transmission between the BBU and the RRU.
Compared with the prior art, the microwave transmission device provided by the embodiment does not unseal and analyze the interface data between the BBU and the RRU, but directly uses the interface data as the packaged SerDes interface data, performs microwave transmission after framing by the microwave transmission device connected with the sending end, performs de-framing by other microwave transmission devices connected with the receiving end to extract the SerDes interface data, and transmits the SerDes interface data to the receiving end connected with the microwave transmission device through the SerDes, thereby realizing high-efficiency data transmission between the BBU and the RRU.
Further, based on the first embodiment, a second embodiment of the microwave transmission apparatus of the present invention is provided, which corresponds to the second embodiment of the foregoing data transmission method, in this embodiment, the indoor processing module 10 is further configured to modulate the first data frame to obtain a first intermediate frequency signal;
the outdoor processing module 20 is further configured to up-convert the first intermediate frequency signal to obtain a first radio frequency signal, and transmit the first radio frequency signal to the outside through a microwave antenna.
It should be noted that, in this embodiment, based on the first embodiment, modulation and transmission of the first data frame are further described, and other references may be made to the first embodiment, which is not described herein again.
It will be understood by those skilled in the art that when the first data frame is transmitted, if the first data frame is directly modulated to a radio frequency signal for transmission, a higher performance mixer is required for implementation, and the higher performance usually means higher hardware cost.
In view of this, in this embodiment, in order to implement data transmission between the BBU and the RRU on the premise of lower hardware cost, the indoor processing module 10 modulates the first data frame by a built-in mixer with ordinary performance to obtain the first intermediate frequency signal after framing the first data frame. And transmits the first if signal to the outdoor processing module 20 through the if cable.
After receiving the first intermediate frequency signal modulated by the indoor processing module 10, the outdoor processing module 20 up-converts the received first intermediate frequency signal to a first radio frequency signal and transmits the first radio frequency signal to the outside through a microwave antenna.
Further, based on the second embodiment, a third embodiment of the microwave transmission device of the present invention is provided, which corresponds to the third embodiment of the foregoing data transmission method, in this embodiment, the outdoor processing module 20 is further configured to down-convert the received second radio frequency signal to obtain a second intermediate frequency signal when receiving the second radio frequency signal transmitted by the second microwave transmission device;
the indoor processing module 10 is further configured to demodulate the second intermediate frequency signal to obtain a second data frame, and extract, by frame decoding, interface data carried by the second data frame, where a target terminal transmitted to the second microwave transmission device by the second terminal is a first terminal; and
and carrying out SerDes coding on the extracted interface data and then transmitting the interface data to the first terminal.
It should be noted that, in this embodiment, on the basis of the second embodiment, description of receiving RRU transmission data by the BBU is further added, and other details may refer to the foregoing embodiments and are not described here again.
In this embodiment, when the RRU needs to transmit data to the BBU, referring to the second embodiment, a second microwave transmission device connected to the RRU converts CPRI interface data to be transmitted into a second radio frequency signal to be transmitted.
When receiving a second radio frequency signal transmitted by a second microwave transmission device, the outdoor processing module 20 of the first microwave transmission device first down-converts the received second radio frequency signal to obtain a second intermediate frequency signal, and transmits the second intermediate frequency signal to the indoor processing module 10 through the intermediate frequency cable; then, the indoor processing module 10 demodulates the second intermediate frequency signal to obtain a second data frame carrying CPRI interface data to be sent by the RRU to the BBU; finally, the indoor processing module 10 extracts CPRI interface data carried by the second data frame by deframing, and transmits the extracted CPRI interface data to the BBU connected thereto after performing SerDes encoding.
Further, based on any one of the foregoing embodiments, a fourth embodiment of the microwave transmission device of the present invention is provided, which corresponds to the fourth embodiment of the foregoing data transmission method, in this embodiment, the microwave transmission device and the first terminal perform data transmission based on an optical interface, and the indoor processing module 10 is further configured to receive a packet loss rate returned by the second microwave transmission device based on the reception and demodulation of the first data frame by the second microwave transmission device; and
adjusting the line rate of the optical port according to the size relationship between the packet loss rate and a preset threshold value, wherein,
when the packet loss rate is greater than the preset threshold value, reducing the line rate of the optical port;
and when the packet loss rate is smaller than the preset threshold value, increasing the line rate of the optical port.
It should be noted that, in this embodiment, on the basis of the foregoing embodiment, the line rate of the optical port between the BBU and the microwave transmission apparatus is dynamically configured, and only this difference is described below, and other parts may refer to the foregoing embodiments, which are not described herein again.
As will be understood by those skilled in the art, during transmission, there will be a certain degree of attenuation along with the increase of the distance of the radio frequency signal, and furthermore, mountains, buildings, etc. will also cause a certain degree of blocking to the radio frequency signal, so that there will be a certain degree of packet loss in the first data frame received by the second microwave transmission apparatus connected to the RRU. In this embodiment, the packet loss rate is used to represent the frequency of packet loss occurring within a preset unit time. The preset unit time may be set according to actual needs, and this embodiment is not particularly limited, and may be set to 5 minutes, for example.
In this embodiment, the second microwave transmission device performs statistics on the condition that the second microwave transmission device receives the first data frame, obtains a packet loss rate of the received first data frame, and sends the statistical packet loss rate to the first microwave transmission device connected to the BBU.
After the first microwave transmission device receives the packet loss rate returned by the second microwave transmission device, the indoor processing module 10 determines whether the received packet loss rate is greater than a preset threshold value; when the packet loss rate is greater than the preset threshold, the indoor processing module 10 reduces the line rate of the optical port between the indoor processing module and the BBU; when the packet loss rate is smaller than the preset threshold, the indoor processing module 10 increases the line rate of the optical port between the indoor processing module and the BBU; when the packet loss rate is equal to the preset threshold, the indoor processing module 10 maintains the line rate of the current optical port.
The preset threshold is set according to actual needs, and this embodiment is not particularly limited, for example, the preset threshold is set to 10 times/minute, that is, packet loss is allowed to occur 10 times within one minute; the line rates of the configurable optical ports include 1.2288Gbps, 2.4576Gbps, 3.072Gbps, 4.9152Gbps, 6.144Gbps, 8.11008Gbps, 9.8304Gbps, and the like.
In the embodiment, the line rate of the optical port between the BBU and the microwave transmission device is dynamically adjusted, so that the packet loss rate of data transmission between the BBU and the RRU can be controlled within a reasonable range, and the quality of data transmission between the BBU and the RRU is effectively improved.
The above description is only a preferred embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes, which are made by using the contents of the present specification and the accompanying drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (8)
1. A data transmission method, characterized in that the data transmission method comprises the steps of:
when receiving interface data of a second terminal which is a target terminal and transmitted by a first terminal, a first microwave transmission device performs serializer/deserializer SerDes decoding processing on the interface data, wherein the first terminal is an indoor baseband processing unit (BBU) and the second terminal is a Radio Remote Unit (RRU), or the first terminal is an RRU and the second terminal is a BBU;
the first microwave transmission device frames the decoded interface data to obtain a first data frame, and modulates the first data frame;
the first microwave transmission device transmits the modulated first data frame outwards through a microwave antenna, so that after a second microwave transmission device receives and demodulates the first data frame, the second microwave transmission device extracts decoded interface data carried by the first data frame through de-framing, performs SerDes coding on the decoded interface data and transmits the decoded interface data to a second terminal;
the modulation processing of the first data frame by the first microwave transmission device comprises:
the first microwave transmission device modulates the first data frame to obtain a first intermediate frequency signal;
the first microwave transmission device transmits the modulated first data frame to the outside through a microwave antenna, and the method comprises the following steps:
and the first microwave transmission device up-converts the first intermediate frequency signal to obtain a first radio frequency signal and transmits the first radio frequency signal to the outside through a microwave antenna.
2. The data transmission method according to claim 1, further comprising:
when receiving a second radio frequency signal transmitted by the second microwave transmission device, the first microwave transmission device down-converts the received second radio frequency signal to obtain a second intermediate frequency signal;
the first microwave transmission device demodulates the second intermediate frequency signal to obtain a second data frame, and unframes and extracts interface data carried by the second data frame, wherein a target terminal transmitted to the second microwave transmission device by the second terminal is the first terminal;
and the first microwave transmission device carries out SerDes coding on the extracted interface data and then transmits the interface data to the first terminal.
3. The data transmission method according to any one of claims 1 to 2, wherein the first microwave transmission device and the first terminal perform data transmission based on an optical port, and after the step of transmitting the modulated first data frame to the outside through a microwave antenna, the first microwave transmission device further includes:
the first microwave transmission device receives the packet loss rate returned by the second microwave transmission device based on the reception and demodulation of the first data frame;
the first microwave transmission device adjusts the line rate of the optical port according to the size relationship between the packet loss rate and a preset threshold value, wherein,
when the packet loss rate is greater than the preset threshold, the first microwave transmission device reduces the line rate of the optical port;
and when the packet loss rate is smaller than the preset threshold value, the first microwave transmission device increases the line rate of the optical port.
4. The data transmission method according to any of claims 1-2, wherein the first data frame comprises a frame header and a payload, the frame header comprising:
e1 bandwidth for identifying the number of ways of E1 data in the payload;
the STM-1 bandwidth is used for identifying the flow of STM-1 data in the payload;
and the interface bandwidth is used for identifying the flow of the interface data in the payload.
5. A microwave transmission device, characterized in that the microwave transmission device comprises:
the indoor processing module is used for carrying out serializer/deserializer SerDes decoding processing on interface data when receiving the interface data which is transmitted by a first terminal and is transmitted by a target terminal and is a second terminal, wherein the first terminal is an indoor baseband processing unit (BBU) and the second terminal is a Radio Remote Unit (RRU), or the first terminal is an RRU and the second terminal is a BBU; and
framing the decoded interface data to obtain a first data frame, and modulating the first data frame;
the outdoor processing module is used for transmitting the modulated first data frame outwards through a microwave antenna, so that a second microwave transmission device can extract decoded interface data carried by the first data frame after receiving and demodulating the first data frame, perform SerDes encoding on the decoded interface data and transmit the encoded interface data to a second terminal;
the indoor processing module is further configured to modulate the first data frame to obtain a first intermediate frequency signal;
the outdoor processing module is also used for up-converting the first intermediate frequency signal to obtain a first radio frequency signal and then transmitting the first radio frequency signal to the outside through a microwave antenna.
6. The microwave transmission apparatus according to claim 5, wherein the outdoor processing module is further configured to down-convert the received second radio frequency signal to obtain a second intermediate frequency signal when receiving the second radio frequency signal transmitted by the second microwave transmission apparatus;
the indoor processing module is further configured to demodulate the second intermediate-frequency signal to obtain a second data frame, and extract, by frame decoding, interface data carried by the second data frame, where a target terminal transmitted by the second terminal to the second microwave transmission device is a first terminal; and
and carrying out SerDes coding on the extracted interface data and then transmitting the interface data to the first terminal.
7. The microwave transmission apparatus according to any one of claims 5 to 6, wherein the microwave transmission apparatus and the first terminal perform data transmission based on an optical interface, and the indoor processing module is further configured to receive a packet loss rate returned by the second microwave transmission apparatus based on receiving and demodulating the first data frame by the second microwave transmission apparatus; and
adjusting the line rate of the optical port according to the size relationship between the packet loss rate and a preset threshold value, wherein,
when the packet loss rate is greater than the preset threshold value, reducing the line rate of the optical port;
and when the packet loss rate is smaller than the preset threshold value, increasing the line rate of the optical port.
8. Microwave transmission device according to any of claims 5-6, characterized in that the first data frame comprises a frame header and a payload, the frame header comprising:
e1 bandwidth for identifying the number of ways of E1 data in the payload;
the STM-1 bandwidth is used for identifying the flow of STM-1 data in the payload;
and the interface bandwidth is used for identifying the flow of the interface data in the payload.
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