CN114024598B - Forwarding interface test method and device - Google Patents
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- CN114024598B CN114024598B CN202111277740.6A CN202111277740A CN114024598B CN 114024598 B CN114024598 B CN 114024598B CN 202111277740 A CN202111277740 A CN 202111277740A CN 114024598 B CN114024598 B CN 114024598B
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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
- H04B10/07—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems
- H04B10/075—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using an in-service signal
- H04B10/079—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using an in-service signal using measurements of the data signal
- H04B10/0795—Performance monitoring; Measurement of transmission parameters
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/25—Arrangements specific to fibre transmission
- H04B10/2581—Multimode transmission
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/25—Arrangements specific to fibre transmission
- H04B10/2589—Bidirectional transmission
- H04B10/25891—Transmission components
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L69/00—Network arrangements, protocols or services independent of the application payload and not provided for in the other groups of this subclass
- H04L69/08—Protocols for interworking; Protocol conversion
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L69/00—Network arrangements, protocols or services independent of the application payload and not provided for in the other groups of this subclass
- H04L69/22—Parsing or analysis of headers
Abstract
The application discloses a method and a device for testing a forwarding interface. Wherein, the method comprises the following steps: establishing communication connection between an open distributed unit and an open wireless unit in an open wireless access network based on a target forwarding interface protocol, and transmitting optical signals; the optical signal is divided into a first optical signal and a second optical signal through an optical splitter, data transmission between the open distributed unit and the open wireless unit is carried out through the first optical signal, and a baseband data packet in the optical signal is obtained through the second optical signal; analyzing a frame structure of a baseband data packet to obtain in-phase orthogonal carrier data, performing format conversion on the in-phase orthogonal carrier data to obtain target data, and determining target time-frequency information according to the target data; and determining the state of the forwarding interface according to the target time-frequency information. The method and the device solve the technical problem that a forward interface of the open wireless access network is difficult to test in real time and effectively in the related technology.
Description
Technical Field
The application relates to the technical field of open wireless access networks, in particular to a method and a device for testing a forwarding interface.
Background
With the advent of the 5G era, software and hardware decoupling in a traditional communication Network is enabled by interface opening, software opening, hardware white-box and Network intellectualization advocated by an Open Radio Access Network (O-RAN), and more equipment vendors begin to participate in research and development to verify interconnection and intercommunication among devices of different equipment vendors, which has become a significant problem about standard popularization and industrial development. Although the O-RAN standardization association has introduced protocol specifications for interoperability testing, and specified detailed interfaces and test items to be tested, there is still a lack of a simple, real-time, and effective test scheme for the most important Open Interface, eCPRI (enhanced Common Public Radio Interface), between an O-RU (Open Radio Unit) and an O-DU (Open Distribution Unit) in a protocol framework.
In view of the above problems, no effective solution has been proposed.
Disclosure of Invention
The embodiment of the application provides a method and a device for testing a forwarding interface, so as to at least solve the technical problem that the forwarding interface of an open wireless access network is difficult to be tested in real time and effectively in the related technology.
According to an aspect of an embodiment of the present application, there is provided a method for testing a forwarding interface, including: establishing a communication connection between an open distributed unit and an open wireless unit in the open wireless access network based on a target forward interface protocol for optical signal transmission, wherein the target forward interface protocol at least comprises: enhanced general public radio interface protocol; dividing the optical signal into a first optical signal and a second optical signal through an optical splitter, performing data transmission between the open distributed unit and the open wireless unit through the first optical signal, and acquiring a baseband data packet in the optical signal through the second optical signal; analyzing the frame structure of the baseband data packet to obtain in-phase orthogonal carrier data, performing format conversion on the in-phase orthogonal carrier data to obtain target data, and determining target time-frequency information according to the target data; and determining the state of the forwarding interface according to the target time-frequency information.
Optionally, the open distributed unit and the open wireless unit establish a connection through a multimode optical fiber and perform optical signal transmission, where the baseband data packet in the optical signal is encapsulated based on the target forwarding interface protocol.
Optionally, the open distributed unit and the open wireless unit are clock synchronized based on a precision clock protocol.
Optionally, the baseband data packets include uplink baseband data packets and downlink baseband data packets, the optical splitter splits an uplink optical signal sent by the open wireless unit into a first uplink optical signal and a second uplink optical signal, transmits the first uplink optical signal to the open distributed unit, and acquires the uplink baseband data packets from the second uplink optical signal based on a packet capturing instruction, where the first uplink optical signal and the second uplink optical signal are the same; and/or dividing the downlink optical signal sent by the open distributed unit into a first downlink optical signal and a second downlink optical signal through the optical splitter, transmitting the first downlink optical signal to the open wireless unit, and acquiring the downlink baseband data packet from the second downlink optical signal based on the packet capturing instruction, wherein the first downlink optical signal and the second downlink optical signal are the same.
Optionally, analyzing a data frame structure of the baseband data packet by taking bytes as a unit, determining information carried by each field in the data frame structure, and obtaining data start information and data length information; and acquiring the in-phase orthogonal carrier data from the data frame structure according to the data starting information and the data length information.
Optionally, the in-phase orthogonal carrier data in a protocol encapsulation format is converted into the target frequency domain data in a frequency domain complex format, where the protocol encapsulation format is a format in which the target forwarding interface protocol encapsulates the baseband data packet; and performing inverse fast Fourier transform on the target frequency domain data to obtain the target time domain data.
Optionally, the target time-frequency information at least includes one of the following: constellation diagram, time-frequency resource diagram, frequency spectrum diagram and time domain diagram.
According to another aspect of the embodiments of the present application, there is also provided a forwarding interface testing apparatus, including: a connection module, configured to establish a communication connection between an open distributed unit and an open wireless unit in an open wireless access network based on a target fronthaul interface protocol, and perform optical signal transmission, where the target fronthaul interface protocol at least includes: enhanced general public radio interface protocol; an obtaining module, configured to divide the optical signal into a first optical signal and a second optical signal through an optical splitter, perform data transmission between the open distributed unit and the open wireless unit through the first optical signal, and obtain a baseband data packet in the optical signal through the second optical signal; the analysis module is used for analyzing the frame structure of the baseband data packet to obtain in-phase orthogonal carrier data, performing format conversion on the in-phase orthogonal carrier data to obtain target data, and determining target time-frequency information according to the target data; and the determining module is used for determining the state of the forwarding interface according to the target time frequency information.
According to another aspect of the embodiments of the present application, a nonvolatile storage medium is further provided, where the nonvolatile storage medium includes a stored program, and when the program runs, the apparatus where the nonvolatile storage medium is located is controlled to execute the method for testing the forwarding interface.
According to another aspect of the embodiments of the present application, there is also provided a processor, where the processor is configured to execute a program, where the program executes the method for testing the forwarding interface when running.
In this embodiment of the present application, first, a communication connection between an open distributed unit and an open wireless unit in an open wireless access network is established based on a target forward interface protocol, and optical signal transmission is performed, where the target forward interface protocol at least includes: enhanced general public radio interface protocol; then, the optical signal is divided into a first optical signal and a second optical signal through an optical splitter, data transmission between the open distributed unit and the open wireless unit is carried out through the first optical signal, and a baseband data packet in the optical signal is obtained through the second optical signal; analyzing the frame structure of the baseband data packet to obtain in-phase orthogonal carrier data, performing format conversion on the in-phase orthogonal carrier data to obtain target data, and determining target time-frequency information according to the target data; and finally, determining the state of the forwarding interface according to the target time-frequency information. In the process, the optical splitter is used for splitting the transmitted optical signal, so that the baseband data packet transmitted in the uplink and the downlink can be obtained in real time, the baseband data packet is analyzed and subjected to format conversion, corresponding frequency domain time domain information is obtained through analysis, and the state of the fronthaul interface can be determined, so that the technical problem that the fronthaul interface for the open wireless access network in the related technology is difficult to test in real time and effectively is solved.
Drawings
The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the application and together with the description serve to explain the application and not to limit the application. In the drawings:
fig. 1 is a schematic flowchart of a method for testing a forwarding interface according to an embodiment of the present application;
fig. 2 is a schematic topology diagram of an optical splitter acquiring uplink and downlink baseband data packets according to an embodiment of the present application;
FIG. 3 is a block diagram of a baseband packet according to an embodiment of the present application;
fig. 4 is a schematic structural diagram of a forwarding interface testing apparatus according to an embodiment of the present application.
Detailed Description
In order to make the technical solutions of the present application better understood by those skilled in the art, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only some embodiments of the present application, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
It should be noted that the terms "first," "second," and the like in the description and claims of this application and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the application described herein are capable of operation in sequences other than those illustrated or described herein. Moreover, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
Example 1
In accordance with an embodiment of the present application, there is provided a method for testing a forwarding interface in an open radio access network, where the steps illustrated in the flowchart of the drawings may be performed in a computer system, such as a set of computer executable instructions, and where a logical order is illustrated in the flowchart, in some cases, the steps illustrated or described may be performed in an order different from that described herein.
Fig. 1 is a schematic flowchart of an optional forwarding interface testing method according to an embodiment of the present application, and as shown in fig. 1, the method at least includes steps S102-S108, where:
step S102, establishing communication connection between an open distributed unit and an open wireless unit in an open wireless access network based on a target forward interface protocol, and performing optical signal transmission, wherein the target forward interface protocol at least comprises: enhanced general public radio interface protocol.
In the O-RAN architecture of the open radio access network, a base station system usually includes an open distributed unit O-DU (also called a baseband unit) and an open radio unit O-RU (also called a radio frequency unit), and since the two are usually provided by different vendors, for the inter-operation test, the O-RAN standardization association defines the protocol specification ora-WG 4-CUS of the O-RAN fronthaul interface, i.e. the above target fronthaul interface protocol, in order to implement the inter-working. Specifically, the forwarding interface data is encapsulated by ethernet, uses a Virtual Local Area Network (VLAN) tagging function, and is transmitted according to an eccri protocol; on the data link, scheduling is performed by a Control Plane (Control Plane), and the transmitted baseband data is carried by a User Plane (User Plane).
The O-DU is usually driven by a server based on a Linux operating system and a Data Plane Development Kit (Data Plane Development Kit) with a network card bound thereto. The DPDK driver runs based on a Linux system, is used for a function library and a driver set for fast data packet processing, can greatly improve data processing performance and throughput and improve the working efficiency of a data plane application program, bypasses a network driver module of a Linux kernel due to the support of the application-below driver, directly reaches a user plane from network hardware without frequent memory copy and system call, and reduces multiple copies of messages on the user plane and the application plane.
In the actual interoperation test process, firstly, the open distributed unit and the open wireless unit are connected through the multimode optical fiber, and optical signal transmission is carried out, wherein a baseband data packet in the optical signal is packaged based on a target forward transmission interface protocol; meanwhile, the open distributed unit and the open wireless unit are clock synchronized based on a precision clock protocol.
Specifically, the O-DU and the O-RU may be directly connected through a multimode fiber for optical signal transmission, and the synchronization of PTP (Precision Time Protocol) of the O-DU and the O-RU may be realized based on an IEEE1588 Protocol and Grand Master clock equipment.
Step S104, the optical splitter splits the optical signal into a first optical signal and a second optical signal, the first optical signal is used to perform data transmission between the open distributed unit and the open wireless unit, and the second optical signal is used to obtain the baseband data packet in the optical signal.
In the interoperation test process, because the real-time connection between the O-DU and the O-RU needs to be maintained, that is, the receiving and sending of the two ends need to be maintained constantly, and for one multimode optical fiber, the two ends only have one optical signal inlet and one optical signal outlet respectively, and therefore uplink and downlink baseband data cannot be obtained in real time. Moreover, since the network card of the server system of the O-DU is bound with the DPDK driver, the baseband data carried by the user plane skips the kernel state of the Linux system, and directly enters the user state of the DPDK for data processing, so that the baseband data cannot be acquired by adopting a packet capturing instruction on the network card of the server.
In the related technology, an off-line testing method is provided by adopting software such as ORAN Studio and VSA of Keysight: baseband data meeting the corresponding format requirement is imported offline and analyzed by using industry-approved baseband data analysis software, so that information such as whether a constellation diagram, a frequency spectrum and each channel pass Cyclic Redundancy Check (CRC) is obtained. However, when the O-DU and the O-RU perform the interoperability test, the scheme cannot acquire and analyze uplink and downlink baseband data of the forwarding interface in real time, and the time cost and complexity of the interoperability test are high.
In other related technologies, devices such as E500 using VIAVI also provide online testing methods, where E500 is a 4G/5G terminal simulator and a large-capacity network testing instrument based on 3GPP standards, and is mainly used for verification of new functions of a base station and performance/capacity testing of the base station. The test method directly connects the O-DU and the E500, uses the RU simulator in the E500 to perform online test, and can analyze to obtain each user-level channel and the detailed configuration information carried by the RRC (Radio Resource Control) signaling by matching with TMA software. Although the scheme can acquire real-time uplink and downlink baseband data on the forwarding interface through the related instruction and obtain an analysis result based on a user level, the scheme lacks real-time analysis on time-frequency domain resources of the baseband data.
In order to solve the above problem, the embodiment of the present application provides a scheme for acquiring uplink and downlink baseband data packets by using an optical splitter, and the following respectively describes processes of acquiring an uplink baseband data packet and acquiring a downlink baseband data packet.
When the uplink baseband data packet is obtained, an uplink optical signal sent by the open wireless unit is divided into a first uplink optical signal and a second uplink optical signal through the optical splitter, the first uplink optical signal is transmitted to the open distributed unit, and the uplink baseband data packet is obtained from the second uplink optical signal based on a packet capturing instruction, wherein the first uplink optical signal and the second uplink optical signal are the same.
Similarly, when a downlink baseband data packet is obtained, a downlink optical signal sent by the open distributed unit may be divided into a first downlink optical signal and a second downlink optical signal by an optical splitter, the first downlink optical signal is transmitted to the open wireless unit, and the downlink baseband data packet is obtained from the second downlink optical signal based on a packet grabbing instruction, where the first downlink optical signal and the second downlink optical signal are the same.
Fig. 2 shows a topology diagram of obtaining uplink and downlink baseband data packets by an optical splitter. Fig. 2 (a) shows a normal connection state, where the O-DU and the O-RU transmit optical signals through multimode optical fibers, the optical signals include uplink and downlink baseband data packets, and an SFP (Small Form-factor plug) is a Small Pluggable interface. Fig. 2 (b) shows the connection status of the uplink baseband packet obtained by the optical splitter: an optical signal emitted from the O-RU is divided into two paths by an optical splitter, one path including the first uplink optical signal is connected back to the O-DU side, the other path including the second uplink optical signal is connected to a baseband data acquisition and analysis device, and the baseband data acquisition and analysis device can acquire an uplink baseband data packet (usually, a pcap data packet based on an ecc ri protocol) from the second uplink optical signal by a packet capturing instruction (e.g., a tcpdump instruction), and analyze the uplink baseband data packet, where a specific analysis process is described in detail in step S106. Similarly, fig. 2 (c) shows the connection status of the downstream baseband packet obtained by the optical splitter: the optical signal sent from the O-DU is divided into two paths by the optical splitter, one path including the first downlink optical signal is connected back to the O-RU side, the other path including the second downlink optical signal is connected to the baseband data acquisition and analysis device, and the baseband data acquisition and analysis device acquires a downlink baseband data packet from the second downlink optical signal through a packet capturing instruction.
And S106, analyzing the frame structure of the baseband data packet to obtain in-phase orthogonal carrier data, performing format conversion on the in-phase orthogonal carrier data to obtain target data, and determining target time-frequency information according to the target data.
After the uplink/downlink baseband data packets are obtained, the uplink/downlink baseband data packets may be analyzed to obtain In-phase orthogonal carrier data (IQ data for short), and time-domain frequency-domain information therein is further analyzed through data format conversion and other manners.
The baseband data packet is encapsulated strictly according to the requirements of the O-RAN forward interface protocol on the control plane and the user plane, the control plane is only responsible for scheduling, and the baseband data is carried on the user plane, so that only the user plane data packet is analyzed in the embodiment of the application. Fig. 3 is a schematic diagram of a frame structure of a user plane packet in the ora-WG 4-CUS protocol, which mainly includes a frame header part and a data part, where the frame header part includes: transport Header (transmission information part based on the eCPRI protocol), radio Application Header (Radio Application information part), section Header (field information part), and the data part mainly includes IQ data.
In some optional embodiments of the present application, a data frame structure of a baseband data packet may be analyzed in units of bytes, and information carried by each field in the data frame structure is determined to obtain data start information and data length information; acquiring in-phase orthogonal carrier data from a data frame structure according to data initial information and data length information; then, converting the in-phase orthogonal carrier data in a protocol encapsulation format into target frequency domain data in a frequency domain complex format, wherein the protocol encapsulation format is a format for encapsulating a baseband data packet by a target forward interface protocol; and performing inverse fast Fourier transform on the target frequency domain data to obtain target time domain data.
Specifically, the user plane packet may be read in units of bytes, and according to the description of each field in the packet frame structure in the ora-WG 4-CUS protocol, information carried by each field is analyzed, and a corresponding value is stored. Optionally, when the user plane data packet is analyzed, for a field specified by the protocol and not existing in some scenarios, whether the corresponding field exists or not may be configured through the configuration file, so that the field may be automatically skipped during the analysis, thereby adapting to the test in different scenarios and ensuring the correctness of the analysis information.
Then, based on the analysis result of each field in the frame structure of the user plane data packet, a startPrbu value (i.e. data start information) and a numpbu value (i.e. data length information) in the Section Header can be obtained, and then a corresponding offset is calculated in the data frame, so as to obtain effective IQ data.
According to the ORAN-WG4-CUS protocol, the IQ data are typically according to I Height of I Is low in Q Height of Q Is low in Big-end and complement format storage package, where I represents in-phase carrier data and Q represents quadrature carrier data, since I/Q is typicallyIs 16bit data, I Height of And I Is low with Q corresponds to the upper 8bit and the lower 8bit in the 16bit of the I data respectively Height of And Q Is low in The big end respectively corresponds to the high 8bit and the low 8bit of the 16 bits of the Q data, and the high byte of the data is stored in the low address of the memory, and the low byte of the data is stored in the high address of the memory (namely the high byte is before and the low byte is after).
In order to facilitate the analysis of the time domain and frequency domain information in the IQ data, the IQ data may be converted into a frequency domain complex format by performing a data format conversion process. In particular, with I = I High (a) *256+I Is low with I can be converted to decimal number, similarly, using Q = Q High (a) *256+Q Is low with Q can be converted into a decimal number, and finally, target frequency domain data IQ = I + iQ in a frequency domain complex format is obtained; and performing Inverse Fast Fourier Transform (IFFT) on the target frequency domain data to obtain target time domain data.
Based on the obtained target frequency domain data and target time domain data, complete time-frequency information can be obtained, namely, a corresponding constellation diagram, a time-frequency resource diagram (with a frame as a unit, the position without data can be automatically filled with zero), a frequency spectrogram and a time domain diagram can be obtained through analysis.
And step S108, determining the state of the forwarding interface according to the target time-frequency information.
According to the above process, complete time frequency information corresponding to the baseband data packet transmitted by the fronthaul interface can be obtained, and the specific state of the fronthaul interface can be analyzed and determined according to the time frequency information, so that the interoperation test is completed.
In this embodiment of the present application, first, a communication connection between an open distributed unit and an open wireless unit in an open wireless access network is established based on a target fronthaul interface protocol for optical signal transmission, where the target fronthaul interface protocol at least includes: enhanced general public radio interface protocol; then, the optical signal is divided into a first optical signal and a second optical signal through an optical splitter, data transmission between the open distributed unit and the open wireless unit is carried out through the first optical signal, and a baseband data packet in the optical signal is obtained through the second optical signal; analyzing the frame structure of the baseband data packet to obtain in-phase orthogonal carrier data, performing format conversion on the in-phase orthogonal carrier data to obtain target data, and determining target time-frequency information according to the target data; and finally, determining the state of the forwarding interface according to the target time-frequency information. In the process, the optical splitter is used for splitting the transmitted optical signal, so that the baseband data packet transmitted in the uplink and the downlink can be obtained in real time, the baseband data packet is analyzed and subjected to format conversion, corresponding frequency domain time domain information is obtained through analysis, and the state of the fronthaul interface can be determined, so that the technical problem that the fronthaul interface for the open wireless access network in the related technology is difficult to test in real time and effectively is solved.
Example 2
According to an embodiment of the present application, there is further provided a forwarding interface testing apparatus for implementing the forwarding interface testing method, as shown in fig. 4, the apparatus at least includes a connection module 40, an obtaining module 42, an analyzing module 44, and a determining module 46, where:
a connection module 40, configured to establish a communication connection between an open distributed unit and an open wireless unit in an open wireless access network based on a target fronthaul interface protocol, and perform optical signal transmission, where the target fronthaul interface protocol at least includes: enhanced general public radio interface protocol.
In the actual interoperation test process, firstly, the open distributed unit and the open wireless unit are connected through the multimode optical fiber, and optical signal transmission is carried out, wherein a baseband data packet in the optical signal is packaged based on a target forward transmission interface protocol; meanwhile, the open distributed unit and the open wireless unit are clock synchronized based on a precision clock protocol.
Specifically, the O-DU and the O-RU may be directly connected through a multimode optical fiber for optical signal transmission, and may implement PTP (Precision Time Protocol) synchronization of the O-DU and the O-RU based on an IEEE1588 Protocol and a Grand Master clock device.
The obtaining module 42 is configured to divide the optical signal into a first optical signal and a second optical signal through an optical splitter, perform data transmission between the open distributed unit and the open wireless unit through the first optical signal, and obtain the baseband data packet in the optical signal through the second optical signal.
In the interoperation test process, because the real-time connection between the O-DU and the O-RU needs to be maintained, that is, the receiving and sending of the two ends need to be maintained constantly, and for one multimode optical fiber, the two ends respectively have only one optical signal inlet and one optical signal outlet, and therefore, uplink and downlink baseband data cannot be acquired in real time. Moreover, since the network card of the server system of the O-DU is bound with the DPDK driver, baseband data carried by the user plane skips the kernel mode of the Linux system, and directly enters the user mode of the DPDK for data processing, so that the baseband data cannot be acquired by adopting a packet capturing instruction on the network card of the server.
In order to solve the above problem, an embodiment of the present invention provides a scheme for acquiring uplink and downlink baseband data packets through an optical splitter, and specifically, when acquiring an uplink baseband data packet, an uplink optical signal sent by an open wireless unit is divided into a first uplink optical signal and a second uplink optical signal through the optical splitter, the first uplink optical signal is transmitted to an open distributed unit, and an uplink baseband data packet is acquired from the second uplink optical signal based on a packet capturing instruction, where the first uplink optical signal and the second uplink optical signal are the same; similarly, when a downlink baseband data packet is obtained, a downlink optical signal sent by the open distributed unit may be divided into a first downlink optical signal and a second downlink optical signal by an optical splitter, the first downlink optical signal is transmitted to the open wireless unit, and the downlink baseband data packet is obtained from the second downlink optical signal based on a packet grabbing instruction, where the first downlink optical signal and the second downlink optical signal are the same.
And the analysis module 44 is configured to analyze a frame structure of the baseband data packet to obtain in-phase orthogonal carrier data, perform format conversion on the in-phase orthogonal carrier data to obtain target data, and determine target time-frequency information according to the target data.
After the uplink/downlink baseband data packets are obtained, the uplink/downlink baseband data packets may be analyzed to obtain In-phase orthogonal carrier data (IQ data for short), and time-domain frequency-domain information therein is further analyzed through data format conversion and other manners.
In some optional embodiments of the present application, a data frame structure of a baseband data packet may be analyzed in units of bytes, and information carried by each field in the data frame structure is determined to obtain data start information and data length information; acquiring in-phase orthogonal carrier data from a data frame structure according to data initial information and data length information; then, converting the in-phase orthogonal carrier data in a protocol packaging format into target frequency domain data in a frequency domain complex format, wherein the protocol packaging format is a format for packaging a baseband data packet by a target forward interface protocol; and performing inverse fast Fourier transform on the target frequency domain data to obtain target time domain data.
Specifically, the user plane packet may be read in units of bytes, and information carried by each field is analyzed according to the description of each field in the packet frame structure in the ora-WG 4-CUS protocol, and a corresponding value is stored. Optionally, when the user plane data packet is analyzed, for a field specified by the protocol and not existing in some scenarios, whether the corresponding field exists or not may be configured through the configuration file, so that the field may be automatically skipped during the analysis, thereby adapting to the test in different scenarios and ensuring the correctness of the analysis information.
Then, based on the analysis result of each field in the frame structure of the user plane data packet, a startPrbu value (i.e. data start information) and a numpbu value (i.e. data length information) in the Section Header can be obtained, and then a corresponding offset is calculated in the data frame, so as to obtain effective IQ data.
According to the ORAN-WG4-CUS protocol, the IQ data are typically according to I High (a) I Is low in Q High (a) Q Is low with And the large end and the complement are stored and packaged in a format. In order to facilitate the analysis of the time domain and frequency domain information in the IQ data, the IQ data may be subjected to a data format conversion process to convert the data format into a frequency domain complex format. In particular, with I = I Height of *256+I Is low with I can be converted to decimal number, similarly, using Q = Q High (a) *256+Q Is low with Q can be converted into a decimal number, and finally, target frequency domain data IQ = I + iQ in a frequency domain complex format is obtained; by aiming at the targetAnd performing Inverse Fast Fourier Transform (IFFT) on the frequency domain data to obtain target time domain data.
Based on the obtained target frequency domain data and target time domain data, complete time-frequency information can be obtained, namely, a corresponding constellation diagram, a time-frequency resource diagram (with a frame as a unit, the position without data can be automatically filled with zero), a frequency spectrogram and a time domain diagram can be obtained through analysis.
And the determining module 46 is configured to determine the state of the forwarding interface according to the target time-frequency information.
According to the above process, complete time frequency information corresponding to the baseband data packet transmitted by the forward interface can be obtained, and the specific state of the forward interface can be analyzed and determined according to the time frequency information, so as to complete the interoperation test.
It should be noted that, in the embodiment of the present application, each module in the forwarding interface test apparatus corresponds to an implementation step of the forwarding interface test method in embodiment 1 one to one, and because the detailed description is already performed in embodiment 1, details that are not partially embodied in this embodiment may refer to embodiment 1, and are not described here again.
Example 3
According to an embodiment of the present application, a nonvolatile storage medium is further provided, where the nonvolatile storage medium includes a stored program, and when the program runs, the device where the nonvolatile storage medium is located is controlled to execute the method for testing the forwarding interface.
According to an embodiment of the present application, there is also provided a processor, configured to execute a program, where the method for testing a forwarding interface is performed when the program is executed.
Specifically, the following steps are mainly executed and implemented when the program runs: establishing communication connection between an open distributed unit and an open wireless unit in an open wireless access network based on a target forward interface protocol for optical signal transmission, wherein the target forward interface protocol at least comprises: enhanced general public radio interface protocol; the optical signal is divided into a first optical signal and a second optical signal through an optical splitter, data transmission between the open distributed unit and the open wireless unit is carried out through the first optical signal, and a baseband data packet in the optical signal is obtained through the second optical signal; analyzing a frame structure of a baseband data packet to obtain in-phase orthogonal carrier data, performing format conversion on the in-phase orthogonal carrier data to obtain target data, and determining target time-frequency information according to the target data; and determining the state of the forward interface according to the target time-frequency information.
The above-mentioned serial numbers of the embodiments of the present application are merely for description and do not represent the merits of the embodiments.
In the above embodiments of the present application, the descriptions of the respective embodiments have respective emphasis, and for parts that are not described in detail in a certain embodiment, reference may be made to related descriptions of other embodiments.
In the embodiments provided in the present application, it should be understood that the disclosed technical content can be implemented in other manners. The above-described apparatus embodiments are merely illustrative, and for example, a division of a unit may be a logical division, and in actual implementation, there may be another division, for example, multiple units or components may be combined or may be integrated into another system, or some features may be omitted, or may not be executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, units or modules, and may be in an electrical or other form.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
In addition, functional units in the embodiments of the present application may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit may be implemented in the form of hardware, or may also be implemented in the form of a software functional unit.
The integrated unit, if implemented in the form of a software functional unit and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solutions of the present application, or portions or all or portions of the technical solutions that contribute to the prior art, may be embodied in the form of a software product, which is stored in a storage medium and includes several instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the methods according to the embodiments of the present application. And the aforementioned storage medium includes: a U-disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a removable hard disk, a magnetic or optical disk, and other various media capable of storing program codes.
The foregoing is only a preferred embodiment of the present application and it should be noted that those skilled in the art can make several improvements and modifications without departing from the principle of the present application, and these improvements and modifications should also be considered as the protection scope of the present application.
Claims (10)
1. A method for testing a forwarding interface is applied to an open wireless access network, and is characterized by comprising the following steps:
establishing a communication connection between an open distributed unit and an open wireless unit in the open wireless access network based on a target forward interface protocol for optical signal transmission, wherein the target forward interface protocol at least comprises: enhanced general public radio interface protocol;
dividing the optical signal into a first optical signal and a second optical signal through an optical splitter, performing data transmission between the open distributed unit and the open wireless unit through the first optical signal, and acquiring a baseband data packet in the optical signal through the second optical signal;
analyzing a frame structure of the baseband data packet to obtain in-phase orthogonal carrier data, performing format conversion on the in-phase orthogonal carrier data to obtain target data, and determining target time-frequency information according to the target data;
and determining the state of the forwarding interface according to the target time-frequency information.
2. The method of claim 1, wherein establishing a communication connection between an open distributed unit and an open wireless unit in the open wireless access network based on a target forwarding interface protocol for optical signal transmission comprises:
the open distributed unit and the open wireless unit establish connection through a multimode fiber and perform optical signal transmission, wherein the baseband data packet in the optical signal is encapsulated based on the target forwarding interface protocol.
3. The method of claim 2, wherein after the open distributed unit and the open wireless unit establish a connection over a multimode optical fiber, the method further comprises:
clock synchronizing the open distributed unit and the open wireless unit based on a precision clock protocol.
4. The method of claim 1, wherein the baseband data packets comprise an uplink baseband data packet and a downlink baseband data packet, the optical signal is divided into a first optical signal and a second optical signal by an optical splitter, data transmission between the open distributed unit and the open wireless unit is performed by the first optical signal, and the baseband data packets in the optical signal are obtained by the second optical signal, and the method comprises:
dividing uplink optical signals sent by the open wireless unit into a first uplink optical signal and a second uplink optical signal through the optical splitter, transmitting the first uplink optical signal to the open distributed unit, and acquiring the uplink baseband data packet from the second uplink optical signal based on a packet capturing instruction, wherein the first uplink optical signal and the second uplink optical signal are the same; and/or the presence of a gas in the gas,
dividing the downlink optical signal sent by the open distributed unit into a first downlink optical signal and a second downlink optical signal through the optical splitter, transmitting the first downlink optical signal to the open wireless unit, and acquiring the downlink baseband data packet from the second downlink optical signal based on the packet capturing instruction, wherein the first downlink optical signal is the same as the second downlink optical signal.
5. The method of claim 1, wherein parsing the frame structure of the baseband data packet to obtain in-phase and quadrature carrier data comprises:
analyzing a data frame structure of the baseband data packet by taking bytes as a unit, determining information carried by each field in the data frame structure, and obtaining data initial information and data length information;
and acquiring the in-phase orthogonal carrier data from the data frame structure according to the data starting information and the data length information.
6. The method of claim 1, wherein the target data comprises target frequency domain data and target time domain data, and performing format conversion on the in-phase and quadrature carrier data to obtain the target data comprises:
converting the in-phase orthogonal carrier data in a protocol encapsulation format into the target frequency domain data in a frequency domain complex format, wherein the protocol encapsulation format is a format in which the target forward interface protocol encapsulates the baseband data packet;
and performing inverse fast Fourier transform on the target frequency domain data to obtain the target time domain data.
7. The method according to any one of claims 1 to 6,
the target time frequency information at least comprises one of the following information: constellation diagram, time-frequency resource diagram, frequency spectrum diagram and time domain diagram.
8. A device for testing a forwarding interface, comprising:
a connection module, configured to establish a communication connection between an open distributed unit and an open wireless unit in an open wireless access network based on a target fronthaul interface protocol, and perform optical signal transmission, where the target fronthaul interface protocol at least includes: enhanced general public radio interface protocol;
an obtaining module, configured to divide the optical signal into a first optical signal and a second optical signal through an optical splitter, perform data transmission between the open distributed unit and the open wireless unit through the first optical signal, and obtain a baseband data packet in the optical signal through the second optical signal;
the analysis module is used for analyzing the frame structure of the baseband data packet to obtain in-phase orthogonal carrier data, performing format conversion on the in-phase orthogonal carrier data to obtain target data, and determining target time-frequency information according to the target data;
and the determining module is used for determining the state of the forwarding interface according to the target time-frequency information.
9. A non-volatile storage medium, comprising a stored program, wherein when the program runs, a device in which the non-volatile storage medium is located is controlled to execute the forwarding interface test method according to any one of claims 1 to 7.
10. An electronic device, comprising: a memory in which a computer program is stored, and a processor configured to execute the forwarding interface testing method according to any one of claims 1 to 7 by the computer program.
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| CN106304419A (en) * | 2016-08-15 | 2017-01-04 | 上海交通大学 | The wireless forward pass system of digital optical transmission based on multi-core fiber |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106304419A (en) * | 2016-08-15 | 2017-01-04 | 上海交通大学 | The wireless forward pass system of digital optical transmission based on multi-core fiber |
| CN112118048A (en) * | 2019-06-20 | 2020-12-22 | 中国移动通信有限公司研究院 | Control method of forwarding network, network equipment and system |
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