CN111615074B

CN111615074B - Indoor distributed system, data transmission method, and storage medium

Info

Publication number: CN111615074B
Application number: CN202010398502.XA
Authority: CN
Inventors: 曾宪平; 叶祖铨; 李玉秀
Original assignee: Comba Network Systems Co Ltd
Current assignee: Comba Network Systems Co Ltd
Priority date: 2020-05-12
Filing date: 2020-05-12
Publication date: 2021-09-24
Anticipated expiration: 2040-05-12
Also published as: WO2021227517A1; CN111615074A

Abstract

The present application relates to an indoor distributed system, a data transmission method, and a storage medium. The indoor distributed system includes: the system comprises a BBU unit, a protocol conversion CB unit, an expansion unit and a remote unit, wherein the CB unit is respectively in communication connection with the BBU unit and the expansion unit, and the expansion unit is in communication connection with the remote unit; the CB unit is used for respectively carrying out protocol conversion on the data received from the extension unit and the BBU unit and sending timing information to the BBU unit; the timing information is used for indicating the BBU unit to send downlink data or receive uplink data; and the BBU is used for carrying out data communication with the CB unit according to the timing information and the data after protocol conversion. The indoor distributed system can reduce the cost of the BBU unit and meet different functional requirements of users on the BBU unit.

Description

Indoor distributed system, data transmission method, and storage medium

Technical Field

The present application relates to the field of communications technologies, and in particular, to an indoor distributed system, a data transmission method, and a storage medium.

Background

As mobile users have increased at a rapid pace and as high-rise buildings become more populated with increased traffic density and coverage requirements, which are large in scale, radio signals of wireless communications are blocked and attenuated therebetween, making normal communications difficult in such high-rise buildings. The blind area is usually formed in the environments of low floors of large buildings, underground shopping malls, underground parking lots and the like. The indoor distributed system can uniformly distribute the signals of the mobile base station at each indoor corner by using the indoor antenna distribution system, thereby ensuring that an indoor area has ideal signal coverage and better improving the mobile communication environment in a building.

In the conventional technology, a dedicated digital baseband chip is generally used by an indoor baseband processing unit (BBU) in an indoor distributed system, and the dedicated digital baseband chip is used to implement protocol conversion of uplink data and downlink data, receive the uplink data, send the downlink data, and the like.

However, in the conventional technology, a BBU unit using a special digital baseband chip is generally provided with a single manufacturer and is high in price, so that the cost of the BBU unit is greatly increased; and the special digital baseband chip is a chip with coupled software and hardware, so that the realization function is limited, and the selection of a user is limited.

Disclosure of Invention

Therefore, a BBU unit using a special digital baseband chip in the traditional technology is needed, the provided manufacturer is single and the price is high, and the cost of the BBU unit is greatly increased; and the special digital baseband chip is a chip with coupled software and hardware, so that the realization function is limited, the user selection is limited, and an indoor distributed system, a data transmission method and a storage medium are provided.

In a first aspect, an embodiment of the present application provides an indoor distributed system, including: the system comprises a BBU (baseband unit), a protocol conversion CB (circuit board) unit, an expansion unit and a remote unit, wherein the CB unit is respectively in communication connection with the BBU and the expansion unit, and the expansion unit is in communication connection with the remote unit;

the CB unit is used for respectively carrying out protocol conversion on the data received from the expansion unit and the BBU unit and sending timing information to the BBU unit; the timing information is used for indicating the BBU unit to send downlink data or receive uplink data;

and the BBU is used for carrying out data communication with the CB unit according to the timing information and the data after the protocol conversion.

In a second aspect, an embodiment of the present application provides a data transmission method, where the data transmission method includes:

the BBU unit receives timing information sent by the CB unit; the timing information is used for indicating the BBU unit to send downlink data or receive uplink data; the CB unit is also used for respectively carrying out protocol conversion on the data received from the extension unit and the BBU unit;

and the BBU unit sends downlink IQ data to the CB unit according to the timing information, or receives uplink IQ data after protocol conversion sent by the CB unit according to the timing information.

In a third aspect, an embodiment of the present application provides a data transmission method, where the data transmission method includes:

the CB unit respectively carries out protocol conversion on the data received from the expansion unit and the BBU unit and sends timing information to the BBU unit; the timing information is used for indicating the BBU unit to send downlink data or receive uplink data;

and the CB unit carries out data communication with the extension unit and the BBU unit respectively based on the data after protocol conversion.

In a fourth aspect, an embodiment of the present application provides a readable storage medium, on which a computer program is stored, where the computer program, when executed by a processor, implements the following steps:

In a fifth aspect, an embodiment of the present application provides a readable storage medium, on which a computer program is stored, where the computer program, when executed by a processor, implements the following steps:

The indoor distributed system, the data transmission method, and the storage medium provided by this embodiment include a BBU unit, a protocol conversion CB unit, an extension unit, and a remote unit, where the CB unit is in communication connection with the BBU unit and the extension unit, respectively, and the extension unit is in communication connection with the remote unit; the CB unit may be configured to perform protocol conversion on data received from the expansion unit and the BBU unit, respectively, and send timing information to the BBU unit; correspondingly, the BBU is used for carrying out data communication with the CB unit according to the timing information and the data after the protocol conversion. In this embodiment, the CB unit may perform protocol conversion on data received from the extension unit and the BBU unit, and the BBU unit does not need to perform protocol conversion on received uplink data or sent downlink data, and only needs to send data to the CB unit or receive data from the CB unit according to the timing information and the data after the protocol conversion, so that the BBU unit does not need a dedicated digital baseband chip to implement each function of the BBU unit, thereby greatly reducing the cost of the BBU unit; in addition, the BBU unit can receive software which is installed by a user and realizes different functions, decoupling can be realized among the software, and software and hardware decoupling can also be realized between the software and a processor of the BBU unit, so that more choices are provided for the user, and different functional requirements of the user on the BBU unit are met.

Drawings

FIG. 1 is a schematic diagram of an indoor distributed system according to an embodiment;

FIG. 2 is a schematic diagram of the internal structure of a BBU unit provided by one embodiment;

fig. 3 is a schematic flow chart of a data transmission method according to an embodiment;

fig. 4 is a schematic flow chart of a data transmission method according to another embodiment;

fig. 5 is a schematic flow chart of a data transmission method according to another embodiment.

Detailed Description

In order to make the objects, technical solutions and advantages of the present application more apparent, the present application is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.

The data transmission method provided in the embodiment of the present application may be applied to an indoor distributed system as shown in fig. 1, where the indoor distributed system includes a BBU unit 101, a protocol Conversion (CB) unit 102, an extension unit 103, and a remote unit 104, where the CB unit 102 and the BBU unit 101 and the extension unit 103 may be connected through optical fiber or network cable in a communication manner, and the extension unit 103 and the remote unit 104 may be connected through optical fiber or network cable in a communication manner. Optionally, the CB unit 102 may be connected to a plurality of expansion units 103, for example, the CB unit 102 is connected to four expansion units 103, each expansion unit 103 may be connected to a plurality of remote units 104, for example, each expansion unit 103 may be connected to eight remote units 104. In an uplink, the remote unit 104 may receive uplink data sent by the user terminal, convert the received uplink data into In-phase Quadrature (IQ) data used by the user platform information under In-phase and Quadrature modulation, and send the obtained uplink IQ data to the extension unit 103, where the extension unit 103 combines the uplink IQ data received from the remote unit 104 and sends the combined uplink IQ data to the CB unit 102, and after the data transmitted from the remote unit 104 to the CB unit 102 are both uplink IQ data of the CPRI protocol and are transmitted to the CB unit 102, the CB unit 102 may convert the uplink IQ data of the CPRI protocol into uplink IQ data of the eCPRI protocol and send the uplink IQ data to the BBU unit 101. In downlink, the BBU unit 101 sends downlink IQ data to be sent in an eccri protocol to the CB unit 102, the CB unit 102 converts the downlink IQ data in the eccri protocol into downlink IQ data in a CPRI protocol and sends the downlink IQ data to the expansion unit 103, and the expansion unit 103 broadcasts the downlink IQ data received from the CB unit 102 to each remote unit 104.

In one embodiment, an indoor distributed system is provided, as shown in fig. 1, the system may include a BBU unit, a protocol conversion CB unit, an extension unit, and a remote unit, the CB unit is communicatively connected to the BBU unit and the extension unit, respectively, and the extension unit is communicatively connected to the remote unit; the CB unit is used for respectively carrying out protocol conversion on the data received from the expansion unit and the BBU unit and sending timing information to the BBU unit; the CB unit is also used for communicating with the BBU unit according to the received monitoring instruction sent by the BBU unit; the timing information is used for indicating the BBU unit to send downlink data or receive uplink data; sending target data to a BBU unit; the target data comprises timing data and IQ data, and the IQ data is data of an eCPRI protocol obtained after conversion by a CB unit; the BBU unit is used for carrying out data communication with the CB unit according to the timing information and the data after the protocol conversion; and is also used for sending monitoring instructions to the CB unit.

Specifically, the data received by the CB unit from the extension unit is uplink IQ data of a CPRI protocol, and the data received by the CB unit from the BBU is downlink IQ data of an eccri protocol. The CB unit may be configured to perform protocol conversion on the data received from the extension unit and the BBU unit, for example, the CB unit may convert uplink IQ data of the CPRI protocol received from the extension unit into uplink IQ data of the eccri protocol and send the uplink IQ data to the BBU unit, and may also convert downlink IQ data of the eccri protocol received from the BBU unit into downlink IQ data of the CPRI protocol and send the downlink IQ data to the extension unit. Further, the extension unit may receive uplink IQ data from the remote unit or transmit downlink IQ data to the remote unit.

The CB unit may also send timing information to the BBU unit, which may be used to instruct the BBU unit to send downlink data or receive uplink data. Optionally, the CB unit may periodically send timing information to the BBU unit. The CB unit can also send the uplink data after the protocol conversion to the BBU unit.

The BBU unit may receive uplink data from the CB unit or transmit downlink data to the CB unit according to the timing information transmitted by the CB unit. Optionally, the BBU unit may be a computer device, and the computer device may be an X86 server, a tablet computer, a desktop computer, a personal digital assistant, and the like. Optionally, the BBU unit may receive Operation Administration and Maintenance (OAM) software installed by a user, driver software of the BBU unit, and the like, so as to implement various functions of the BBU unit, such as an LTE air interface protocol stack, an Operation Maintenance function, a physical layer function, and the like. Optionally, decoupling may be implemented between each piece of software installed on the BBU unit, and each piece of software installed on the BBU unit may also implement software and hardware decoupling with the processor on the BBU unit, so as to provide more choices for the user, and meet different functional requirements of the user on the BBU unit.

The indoor distributed system provided by the embodiment comprises a BBU (baseband unit), a protocol conversion CB unit, an extension unit and a remote unit, wherein the CB unit is respectively in communication connection with the BBU unit and the extension unit, and the extension unit is in communication connection with the remote unit; the CB unit may be configured to perform protocol conversion on data received from the expansion unit and the BBU unit, respectively, and send timing information to the BBU unit; correspondingly, the BBU is used for carrying out data communication with the CB unit according to the timing information and the data after the protocol conversion. In this embodiment, the CB unit may perform protocol conversion on data received from the extension unit and the BBU unit, and the BBU unit does not need to perform protocol conversion on received uplink data or sent downlink data, and only needs to send data to the CB unit or receive data from the CB unit according to the timing information and the data after the protocol conversion, so that the BBU unit does not need a dedicated digital baseband chip to implement each function of the BBU unit, thereby greatly reducing the cost of the BBU unit; in addition, the BBU unit can receive software which is installed by a user and realizes different functions, decoupling can be realized among the software, and software and hardware decoupling can also be realized between the software and a processor of the BBU unit, so that more choices are provided for the user, and different functional requirements of the user on the BBU unit are met.

Fig. 2 is a schematic structural diagram of an indoor distributed system according to another embodiment. On the basis of the embodiment shown in fig. 1, the BBU unit may include a Direct Memory Access (DMA) control unit, a Data Plane Development Kit (DPDK) network card and a CPU; the DMA control unit is connected with the DPDK network card, and the CPU is respectively connected with the DMA control unit and the DPDK network card.

In this embodiment, data required by the DMA control unit, the DPDK network card, and the CPU may all be stored in the memory of the BBU, and the CPU may call the DMA control unit or the DPDK network card by using a corresponding Application Programming Interface (API) to perform the operations shown in the following embodiments. Operations that the above-described DMA control unit, DPDK network card, and CPU need to perform when transmitting IQ data in uplink and downlink are described below, respectively.

When transmitting downlink IQ data in downlink

On the basis of the above embodiment, the timing information is a first interrupt message sent by the CB unit at the nth time; the first interruption message carries a first target subframe identifier; the BBU unit is configured to send downlink IQ data to the CB unit on the downlink subframe corresponding to the first target subframe identifier, and store the downlink IQ data to be sent at the N +1 th time in the memory space of the BBU unit to the cache space of the BBU unit.

In this embodiment, the first interrupt message carries a first target-subframe indicator, where the first target-subframe indicator may include at least one of a numerical value, a character and an english letter, and for example, the first target-subframe indicator may be SF0 or SF 1. Further, the first interrupt message is also used to trigger the BBU unit to send downlink IQ data. When the first target subframe identifier corresponds to a downlink subframe or a downlink special subframe, the BBU unit may send downlink IQ data to the CB unit, and at the same time, the BBU unit may further execute bottom software to store the downlink IQ data to be sent at the N +1 th time in the memory space of the BBU unit to the cache space of the BBU unit, and the bottom software is used to store the downlink IQ data to be sent at the N +1 th time in the memory space of the BBU unit to the cache space of the BBU unit, so that sending of the downlink IQ data is not affected, that is, the sending of the downlink IQ data and storing of the downlink IQ data to be sent at the next time are executed by using different layers of software, and the two do not affect each other, thereby improving accuracy of data sending; in addition, the bottom layer software is used for storing the downlink IQ data to be sent at the N +1 th time in the memory space of the BBU unit to the cache space of the BBU unit, so that the BBU unit can conveniently and rapidly read the downlink IQ data to be sent from the cache space of the BBU unit when the downlink IQ data to be sent needs to be sent, the sending efficiency of the downlink IQ data to be sent is improved, and the real-time requirement of communication is improved. It should be noted that, when the downlink IQ data sent by the BBU unit at the nth time is at the nth-1 time, the BBU unit stores data to the buffer space of the BBU unit.

Optionally, the nth time is a time corresponding to the nth 1PPS minus a preset compensation time. Further, the preset compensation duration is a duration determined according to a time delay, and the time delay includes at least one of the following: delay generated when a network packet corresponding to IQ data is transmitted between the BBU unit and the CB unit; the IQ data comprises downlink IQ data and uplink IQ data; the inherent time delay corresponding to the CB unit, the extension unit and the remote unit respectively, the transmission time delay between the CB unit and the extension unit and the transmission time delay between the extension unit and the remote unit. Optionally, the preset compensation time period may be 135 us.

Optionally, the DMA control unit is configured to determine, according to the first target subframe identifier, downlink IQ data corresponding to the first target subframe identifier; writing downlink IQ data in the cache space of the BBU into a network card queue in the DPDK network card; the DPDK network card is used for determining the priority of the downlink IQ data; and the CPU is used for determining the sending sequence of the downlink IQ data according to the priority of the downlink IQ data and sending the downlink IQ data when the sending sequence of the downlink IQ data arrives.

In this embodiment, when the BBU unit starts sending the downlink IQ Data, the DMA control unit may automatically write the downlink IQ Data corresponding to the first target subframe identifier into a network card queue in a Data Plane Development Kit (DPDK) network card from a buffer space of the BBU unit, so as to prepare for the BBU unit to send the downlink IQ Data. After the DPDK network card determines the priority of the downlink IQ data, the CPU may determine the transmission order of the downlink IQ data according to the priority of the downlink IQ data, and transmit the downlink IQ data when the transmission order of the downlink IQ data arrives. Optionally, the higher the priority of the downlink IQ data is, the earlier the transmission order is.

Optionally, the DPDK network card may determine, according to the VLAN identifier of the downlink IQ data, the priority corresponding to the VLAN identifier of the downlink IQ data as the priority of the downlink IQ data, for example, if the VLAN identifier of the downlink IQ data is 2 and the corresponding priority is a medium priority, the DPDK network card may determine that the priority of the downlink IQ data is the medium priority. Optionally, the timing information sent by the CB unit also has a priority, and the DPDK network card may determine the priority of the timing information according to the VLAN identifier of the timing information, for example, if the VLAN identifier of the timing information is 1, and the corresponding priority is the highest priority, the DPDK network card may determine that the priority of the timing information is the highest priority. Different data have different priorities, so that the BBU unit can conveniently determine the order of receiving or sending the data according to the priorities of the different data, and timely receive or send the data with higher priorities, thereby improving the real-time requirement of communication.

Optionally, the CB unit may send the received downlink IQ data sent by the BBU unit to the extension unit, and then the extension unit broadcasts the downlink IQ data to each remote unit, so that the remote unit converts the received downlink IQ data into radio frequency information, and transmits the radio frequency information to the air through the antenna.

(II) when transmitting uplink IQ data in uplink

On the basis of the above embodiment, the timing information is a second interrupt message sent by the CB unit at the mth time; the second interruption message carries a second target subframe identifier; the CB unit is also used for sending first uplink IQ data to the BBU unit after the Mth moment; the BBU unit is used for receiving the first uplink IQ data sent by the CB unit and storing second uplink IQ data in a network card queue of the DPDK network card to a memory space of the BBU unit; and the second uplink IQ data is uplink IQ data sent by the CB unit and received by the BBU unit at the M-1 moment.

In this embodiment, the second interrupt message carries a second target-subframe indicator, where the second target-subframe indicator may include at least one of a numerical value, a character, and an english letter, and for example, the second target-subframe indicator may be SF0 or SF 1. Further, the second interrupt message is also used to trigger the BBU unit to receive the uplink IQ data. When the second target subframe identifier corresponds to an uplink subframe or an uplink special subframe, the BBU unit may receive the first uplink IQ data from the CB unit, and at the same time, the BBU unit may further execute bottom software to store the second uplink IQ data in the network card queue of the DPDK network card to a memory space of the BBU unit; and the second uplink IQ data is uplink IQ data sent by the CB unit and received by the BBU unit at the M-1 moment.

The second uplink IQ data sent by the CB unit and received by the BBU unit at the M-1 moment is received by bottom software, so that the receiving of the first uplink IQ data is not influenced, namely, the first uplink IQ data is received and the second uplink IQ data received at the last moment is stored by the software of different layers, and the first uplink IQ data and the second uplink IQ data are not influenced mutually, so that the conflict between the storage data and the receiving data of the BBU unit is avoided, and the data sending accuracy is improved; in addition, the bottom layer software is used for storing the uplink IQ data received at the M-1 th time in the memory space of the BBU unit to the memory space of the BBU unit so as to complete the reception of the uplink IQ data, and the first uplink IQ data is received and the second uplink IQ data is stored at the same time, so that the reception efficiency of the uplink IQ data can be improved, and the real-time requirement of communication is improved. Optionally, the mth time is a time corresponding to the mth 1PPS plus a preset compensation duration.

When the BBU unit sends downlink IQ data to the CB unit, the downlink IQ data is sent in advance with a preset compensation duration, and when the BBU unit receives uplink IQ data sent by the CB unit, the uplink IQ data is received after the preset compensation duration, which is to achieve air interface alignment and ensure continuity of data reception and data transmission of the user terminal.

Optionally, the DPDK network card is configured to determine a priority of the first uplink IQ data, determine a receiving order of the first uplink IQ data according to the priority of the first uplink IQ data, and receive the first uplink IQ data when the receiving order of the first uplink IQ data arrives; and the CPU is also used for writing the second uplink IQ data into the cache space of the BBU unit and writing the second uplink IQ data in the cache space of the BBU unit into the memory space of the BBU unit.

In this embodiment, when the BBU unit receives the first uplink IQ data, the DPDK network card may determine the priority of the first uplink IQ data, so that the CPU determines the receiving order of the first uplink IQ data according to the priority of the first uplink IQ data, and receives the first uplink IQ data when the receiving order of the first uplink IQ data arrives. Optionally, the higher the priority of the first uplink IQ data is, the earlier the receiving order is. Optionally, priorities of all IQ data (including downlink IQ data, downlink IQ data to be transmitted, first uplink IQ data, and second uplink IQ data, and the like) may be the same, and thus the priorities of the first uplink IQ data and the downlink IQ data may be the same. Further, similar to the above-mentioned manner of determining the priority of the downlink IQ data, the DPDK network card may determine, according to the VLAN id of the first uplink IQ data, the priority corresponding to the VLAN id of the first uplink IQ data as the priority of the first uplink IQ data, for example, if the VLAN id of the first uplink IQ data is 2 and the corresponding priority is a medium priority, the DPDK network card may determine that the priority of the first uplink IQ data is the medium priority.

Optionally, the first uplink IQ data and the second uplink IQ data sent by the CB unit to the BBU unit are sent from the remote unit to the expansion unit, and are sent to the CB unit after being combined by the expansion unit. Further, the CB unit needs to convert the first uplink IQ data and the second uplink IQ data of the CPRI protocol received from the extension unit into uplink IQ data of the eccri protocol. The BBU may transmit the first uplink IQ data and the second uplink IQ data received from the CB to the core network through the network.

In the above two sections (a) and (b), operations that the DMA control unit, the DPDK network card, the CPU, and the like need to perform when transmitting IQ data in the uplink and in the downlink are described. When transmitting IQ data in a downlink, transmitting downlink IQ data and storing downlink IQ data to be transmitted at the next moment are executed by using different layers of software, and the downlink IQ data and the stored downlink IQ data cannot influence each other, so that the accuracy of data transmission is improved; in addition, the bottom layer software is used for storing the downlink IQ data to be sent at the N +1 th time in the memory space of the BBU unit to the cache space of the BBU unit, so that the BBU unit can conveniently and rapidly read the downlink IQ data to be sent from the cache space of the BBU unit when the downlink IQ data to be sent needs to be sent, the sending efficiency of the downlink IQ data to be sent is improved, and the real-time requirement of communication is improved. When transmitting IQ data in an uplink, receiving first uplink IQ data and storing second uplink IQ data at the previous moment are executed by using different layers of software, and the first uplink IQ data and the second uplink IQ data cannot influence each other, so that the conflict between the data stored in the BBU and the received data is avoided, and the accuracy of data transmission is improved; in addition, the bottom layer software is used for storing the uplink IQ data received at the M-1 th time in the memory space of the BBU unit to the memory space of the BBU unit so as to complete the reception of the uplink IQ data, and the first uplink IQ data is received and the second uplink IQ data is stored at the same time, so that the reception efficiency of the uplink IQ data can be improved, and the real-time requirement of communication is improved.

In an indoor distributed system provided in another embodiment, the BBU unit is further configured to send a monitoring instruction to the CB unit; the CB unit is also used for sending monitoring data to the BBU unit according to the monitoring instruction.

In this embodiment, the monitoring instruction may be an instruction that instructs the CB unit to send monitoring data to the BBU unit. The monitoring data may include at least one of configuration data of each monitoring parameter of the CB unit, read data of each monitoring parameter of the CB unit, upgrade data of the CB unit, restart data of the CB unit, and log collection data of the CB unit.

The BBU unit may send the monitoring instruction to the CB unit, and correspondingly, the CB unit may obtain the monitoring data of the CB unit by using the monitoring system of the CB unit according to the received monitoring instruction sent by the BBU unit, and send the obtained monitoring data of the CB unit to the BBU unit.

Optionally, the CPU is configured to write the monitoring instruction from the memory space of the BBU unit into the cache space of the BBU unit; the DMA control unit is used for writing the monitoring instruction into a network card queue in the DPDK network card from the cache space of the BBU unit; the DPDK network card is used for determining the priority of the monitoring instruction; and the CPU is also used for determining the sending sequence of the monitoring instructions according to the priority of the monitoring instructions and sending the monitoring instructions when the sending sequence of the monitoring instructions arrives.

In this embodiment, the CPU may write the monitoring instruction from the memory space of the BBU unit into the cache space of the BBU unit, and write the monitoring instruction from the cache space of the BBU unit into the network card queue in the DPDK network card by using the DMA control unit, so as to prepare for the CPU to send the monitoring instruction to the CB unit.

When the BBU unit sends the monitoring instruction, the DPDK network card may determine the priority of the monitoring instruction, determine the sending order of the monitoring instruction according to the priority of the monitoring instruction, and send the monitoring instruction when the sending order of the monitoring instruction arrives. Optionally, the higher the priority of the monitoring instruction, the earlier the sending order.

Optionally, the DPDK network card is configured to determine a priority of the monitoring data; determining a receiving sequence of the monitoring data according to the priority of the monitoring data, receiving the monitoring data when the receiving sequence of the monitoring data arrives, and writing the monitoring data into a network card queue of the DPDK network card; and the CPU is also used for writing the monitoring data into the cache space of the BBU from the network card queue of the DPDK network card, and writing the monitoring data in the cache space of the BBU into the memory space of the BBU.

In this embodiment, the DPDK network card may determine the priority of the monitoring data according to the priority corresponding to the VLAN identifier of the monitoring data, for example, if the VLAN identifier of the monitoring data is 3 and the lowest priority in the corresponding priorities is the lowest priority, the DPDK network card may determine the lowest priority in the priorities of the monitoring data. Optionally, the priority of the monitoring instruction is the same as that of the monitoring data.

When the BBU unit receives the monitoring data sent by the CB unit, the DPDK network card may determine a receiving order of the monitoring data by using a priority of the monitoring data, and receive the monitoring data when the receiving order of the monitoring data arrives, and write the monitoring data into a network card queue of the DPDK network card, so that the CPU writes the monitoring data into a cache space of the BBU unit from the network card queue of the DPDK network card, and writes the monitoring data in the cache space of the BBU unit into a memory space of the BBU unit, thereby completing receiving the monitoring data.

Optionally, the BBU unit, the CB unit, the expansion unit, the remote unit, and the like may have corresponding monitoring systems, and in a downlink, a previous stage may send a monitoring instruction to a next stage to obtain monitoring data of the next stage, and the next stage may obtain the monitoring data from the corresponding monitoring system according to the received monitoring instruction of the previous stage and send the obtained monitoring data to the previous stage. For example, the BBU unit sends a monitoring instruction to the CB unit, the CB unit converts received monitoring data of the expansion unit and the remote unit and monitoring data of the CB unit into monitoring data of an eccri Protocol and sends the monitoring data to the BBU unit, the CB unit sends the monitoring instruction to the expansion unit, the expansion unit sends the monitoring data of the expansion unit and the monitoring data received from the remote unit from the expansion unit to the CB unit, wherein a data transmission Protocol between the CB unit and the expansion unit is a Business Management Communication Protocol (BMCP), the expansion unit can send the monitoring instruction to the remote unit, and the remote unit writes acquired monitoring data of the remote unit into a register of the remote unit according to the received monitoring instruction of the expansion unit for the expansion unit to read.

Optionally, the monitoring data of the CB unit, the expansion unit, and the remote unit may be maintained by using one operation and maintenance function software in the BBU unit, and the monitoring data of the BBU unit may be maintained by using one operation and maintenance function software, so that the operation and maintenance function software of the monitoring data of the BBU unit is independent of the operation and maintenance function software corresponding to other units including the CB unit, the expansion unit, and the remote unit, thereby facilitating software decoupling.

In the indoor distributed system provided by this embodiment, the BBU unit may send the monitoring instruction to the CB unit, so that the CB unit sends the monitoring data to the BBU unit according to the monitoring instruction. And the DPDK network card can determine the priority of the monitoring instruction and the priority of the monitoring data, so that the BBU unit can send the monitoring instruction according to the determined priority of the monitoring instruction, or receive the monitoring data according to the priority of the monitoring data, so as to implement different operations on data with different priorities, ensure that data with high priority can be sent or received in time, and improve the real-time requirement of communication.

Fig. 3 is a flowchart illustrating a data transmission method according to an embodiment. The embodiment relates to a communication process between the BBU unit and the CB unit when data transmitted between the BBU unit and the CB unit is IQ data. As shown in fig. 3, the method may include:

s301, the BBU unit receives timing information sent by the CB unit; the timing information is used for indicating the BBU unit to send downlink data or receive uplink data; the CB unit is also used for carrying out protocol conversion on the data received from the extension unit and the BBU unit respectively.

Specifically, the data received by the CB unit from the extension unit is uplink IQ data of a CPRI protocol, and the data received by the CB unit from the BBU unit is downlink IQ data of an eccri protocol. The CB unit may be configured to perform protocol conversion on the data received from the extension unit and the BBU unit, for example, the CB unit may convert uplink IQ data of the CPRI protocol received from the extension unit into uplink IQ data of the eccri protocol and send the uplink IQ data to the BBU unit, and may also convert downlink IQ data of the eccri protocol received from the BBU unit into downlink IQ data of the CPRI protocol and send the downlink IQ data to the extension unit. Further, the extension unit may receive uplink IQ data from the remote unit or transmit downlink IQ data to the remote unit.

The timing information is used to instruct the BBU unit to send downlink data or receive uplink data, and the BBU unit may receive the timing information periodically sent to the BBU unit by the CB unit, and further, the period for the CB unit to send the timing information may be 1 ms.

And S302, the BBU sends downlink IQ data to the CB unit according to the timing information, or receives uplink IQ data after protocol conversion sent by the CB unit according to the timing information.

Specifically, the BBU unit may receive uplink IQ data from the CB unit or send downlink IQ data to the CB unit according to the timing information sent by the CB unit. Optionally, the BBU unit may be a computer device, and the computer device may be an X86 server, a tablet computer, a desktop computer, a personal digital assistant, and the like. Optionally, the BBU unit may receive Operation Administration and Maintenance (OAM) software installed by a user, driver software of the BBU unit, and the like, so as to implement various functions of the BBU unit, such as an LTE air interface protocol stack, an Operation Maintenance function, a physical layer function, and the like. Optionally, decoupling may be implemented between each piece of software installed on the BBU unit, and each piece of software installed on the BBU unit may also implement software and hardware decoupling with the processor on the BBU unit, so as to provide more choices for the user, and meet different functional requirements of the user on the BBU unit.

In the data transmission method provided in this embodiment, the BBU unit may receive timing information sent by the CB unit, and the CB unit is further configured to perform protocol conversion on data received from the expansion unit and the BBU unit, respectively; and the BBU unit sends downlink IQ data to the CB unit according to the timing information, or receives uplink IQ data after protocol conversion sent by the CB unit according to the timing information. In this embodiment, the CB unit may perform protocol conversion on data received from the extension unit and the BBU unit, and the BBU unit does not need to perform protocol conversion on received uplink data or sent downlink data, and only needs to send data to the CB unit or receive data from the CB unit according to the timing information and the data after the protocol conversion, so that the BBU unit needs a dedicated digital baseband chip to implement each function of the BBU unit, thereby greatly reducing the cost of the BBU unit; in addition, the BBU unit can receive software which is installed by a user and realizes different functions, decoupling can be realized among the software, and software and hardware decoupling can also be realized between the software and a processor of the BBU unit, so that more choices are provided for the user, and different functional requirements of the user on the BBU unit are met.

In a data transmission method provided in another embodiment, the present embodiment relates to an implementation procedure in which, when transmitting IQ data in a downlink, a BBU unit sends downlink IQ data to a CB unit according to timing information. On the basis of the above embodiment, the timing information is a first interrupt message sent by the CB unit at the nth time; the first interrupt message carries a first target subframe identifier; the sending, by the BBU unit to the CB unit according to the timing information in S302, the downlink IQ data may include: and the BBU unit sends downlink IQ data to the CB unit on a downlink subframe corresponding to the first target subframe identifier according to the first target subframe identifier, and stores the downlink IQ data to be sent at the (N + 1) th moment in the memory space of the BBU unit to the cache space of the BBU unit.

Optionally, the implementation process of the BBU unit sending downlink IQ data to the CB unit on the downlink subframe corresponding to the first target subframe identifier according to the first target subframe identifier may include: the BBU unit determines downlink IQ data corresponding to the first target subframe identifier according to the first target subframe identifier; writing downlink IQ data in the cache space of the BBU into a network card queue in the BBU; and the BBU unit determines the sending sequence of the downlink IQ data according to the priority of the downlink IQ data in the network card queue, and sends the downlink IQ data when the sending sequence of the downlink IQ data arrives.

In this embodiment, when the BBU unit starts sending the downlink IQ data, the BBU unit may automatically write the downlink IQ data corresponding to the first target subframe identifier into the network card queue in the BBU unit from the buffer space of the BBU unit, so as to prepare for the BBU unit to send the downlink IQ data.

The BBU unit may determine the priority of the downlink IQ data, so that the BBU unit determines the transmission order of the downlink IQ data according to the determined priority of the downlink IQ data, and transmits the downlink IQ data when the transmission order of the downlink IQ data arrives. Optionally, the higher the priority of the downlink IQ data is, the earlier the transmission order is.

Optionally, the nth time may be a time corresponding to the nth 1PPS minus a preset compensation time. Further, the preset compensation duration is a duration determined according to a time delay, and the time delay includes at least one of the following: delay generated when a network packet corresponding to IQ data is transmitted between the BBU unit and the CB unit; the IQ data comprises downlink IQ data and uplink IQ data; the inherent time delay corresponding to the CB unit, the extension unit and the remote unit respectively, the transmission time delay between the CB unit and the extension unit and the transmission time delay between the extension unit and the remote unit.

In the data transmission method provided in this embodiment, when transmitting IQ data in a downlink, the BBU unit may receive timing information sent by the CB unit, and send downlink IQ data to the CB unit according to the timing information, or receive uplink IQ data after protocol conversion sent by the CB unit according to the timing information. In this embodiment, sending downlink IQ data and storing the downlink IQ data to be sent at the next time are executed by using different layers of software, and the two do not affect each other, thereby improving the accuracy of data sending; in addition, the bottom layer software is used for storing the downlink IQ data to be sent at the N +1 th time in the memory space of the BBU unit to the cache space of the BBU unit, so that the BBU unit can conveniently and rapidly read the downlink IQ data to be sent from the cache space of the BBU unit when the downlink IQ data to be sent needs to be sent, the sending efficiency of the downlink IQ data to be sent is improved, and the real-time requirement of communication is improved.

Fig. 4 is a schematic flow chart of a data transmission method according to another embodiment. The embodiment relates to an implementation process of sending a monitoring instruction to a CB unit by a BBU unit and receiving monitoring data sent by the CB unit according to the monitoring instruction. On the basis of the foregoing embodiment, optionally, the data transmission method may further include:

s401, the BBU unit sends a monitoring instruction to the CB unit, and the monitoring instruction is used for acquiring monitoring data.

The monitoring instruction may be an instruction instructing the CB unit to send monitoring data to the BBU unit. The monitoring data may include at least one of configuration data of each monitoring parameter of the CB unit, read data of each monitoring parameter of the CB unit, upgrade data of the CB unit, restart data of the CB unit, and log collection data of the CB unit.

Specifically, the BBU unit may send the monitoring instruction to the CB unit at regular time or according to a preset cycle, so that the CB unit may obtain the monitoring data of the CB unit by using the monitoring system of the CB unit according to the received monitoring instruction sent by the BBU unit, and send the obtained monitoring data of the CB unit to the BBU unit.

Optionally, the implementation step of sending the monitoring instruction to the CB unit by the BBU unit may include: the BBU unit writes a monitoring instruction to be sent to the CB unit into a cache space of the BBU unit from a memory space of the BBU unit, and writes the monitoring instruction into a network card queue in the BBU unit from the cache space of the BBU unit; and the BBU unit determines the priority of the monitoring instructions, determines the sending sequence of the monitoring instructions according to the priority of the monitoring instructions, and sends the monitoring instructions when the sending sequence of the monitoring instructions arrives.

In this embodiment, the BBU unit may write the monitoring instruction from the memory space of the BBU unit into the cache space of the BBU unit, and write the monitoring instruction from the cache space of the BBU unit into the network card queue in the BBU unit, so as to prepare for the BBU unit to send the monitoring instruction to the CB unit. The BBU unit may determine a priority of the monitoring data, determine a sending order of the monitoring instructions according to the priority of the monitoring instructions, and send the monitoring instructions when the sending order of the monitoring instructions arrives. Optionally, the higher the priority of the monitoring instruction, the earlier the sending order.

S402, the BBU unit receives monitoring data sent by the CB unit according to the monitoring instruction.

Specifically, when receiving the monitoring data sent by the CB unit, the BBU unit may determine a receiving order of the monitoring data by using a priority of the monitoring data, receive the monitoring data when the receiving order of the monitoring data arrives, and write the monitoring data into a network card queue of the BBU unit, so that the BBU unit writes the monitoring data into a cache space of the BBU unit from the network card queue of the BBU unit, and writes the monitoring data in the cache space of the BBU unit into a memory space of the BBU unit, thereby completing receiving the monitoring data.

In the data transmission method provided in this embodiment, the BBU unit may send a monitoring instruction to the CB unit, and receive monitoring data sent by the CB unit according to the monitoring instruction. The BBU unit may determine the priority of the monitoring instruction and the priority of the monitoring data, so that the BBU unit may send the monitoring instruction according to the determined priority of the monitoring instruction, or receive the monitoring data according to the priority of the monitoring data, to implement different operations on data with different priorities, to ensure that data with high priority can be sent or received in time, to improve the real-time requirement of communication.

Fig. 5 is a flowchart illustrating a data transmission method according to an embodiment. The embodiment relates to a data communication process between the CB unit and the BBU unit when the CB unit performs protocol conversion on data received from the expansion unit and the BBU unit, respectively, and sends timing information to the BBU unit. As shown in fig. 5, the method may include:

s501, the CB unit respectively performs protocol conversion on data received from the expansion unit and the BBU unit and sends timing information to the BBU unit; the timing information is used for indicating the BBU unit to send downlink data or receive uplink data.

Optionally, the BBU unit may receive that the CB unit may periodically send the timing information to the BBU unit, and further, a period for the CB unit to send the timing information may be 1 ms.

And S502, the CB unit respectively performs data communication with the extension unit and the BBU unit based on the data after protocol conversion.

Specifically, the CB unit may send the converted downlink IQ data of the CPRI protocol to the extension unit, or receive the uplink IQ data of the CPRI protocol from the extension unit, so as to implement data communication with the extension unit; the CB unit may further send the uplink IQ data of the eccri protocol obtained by the conversion to the BBU unit, or receive the downlink IQ data of the eccri protocol sent by the BBU unit, so as to implement data communication with the BBU unit.

In the data transmission method provided in this embodiment, the CB unit may perform protocol conversion on data received from the expansion unit and the BBU unit, respectively, and send timing information to the BBU unit; and the CB unit carries out data communication with the extension unit and the BBU unit respectively based on the data after the protocol conversion. In this embodiment, the CB unit may perform protocol conversion on data received from the extension unit and the BBU unit, and the BBU unit does not need to perform protocol conversion on received uplink data or sent downlink data, and only needs to send data to the CB unit or receive data from the CB unit according to the timing information and the data after the protocol conversion, so that the BBU unit needs a dedicated digital baseband chip to implement each function of the BBU unit, thereby greatly reducing the cost of the BBU unit; in addition, the BBU unit can receive software which is installed by a user and realizes different functions, decoupling can be realized among the software, and software and hardware decoupling can also be realized between the software and a processor of the BBU unit, so that more choices are provided for the user, and different functional requirements of the user on the BBU unit are met.

In another embodiment of the data transmission method, the "CB unit sending timing information" in S501 may include: the timing information is a first interrupt message sent by the CB unit at the Nth moment; the first interruption message carries a first target subframe identifier; the first target subframe identifier is used for indicating the BBU unit to send downlink IQ data to the CB unit on a downlink subframe corresponding to the first target subframe identifier, and storing the downlink IQ data to be sent at the N +1 th time in a memory space of the BBU unit to a cache space of the BBU unit.

Optionally, the nth time is a time corresponding to the nth 1PPS minus a preset compensation time. Further, the preset compensation duration is a duration determined according to a time delay, and the time delay includes at least one of the following: delay generated when a network packet corresponding to IQ data is transmitted between the BBU unit and the CB unit; the IQ data comprises downlink IQ data and uplink IQ data; the inherent time delay corresponding to the CB unit, the extension unit and the remote unit respectively, the transmission time delay between the CB unit and the extension unit and the transmission time delay between the extension unit and the remote unit.

In another embodiment of the data transmission method, the "CB unit sending timing information" in S501 may include: the CB unit sends a second interrupt message at the Mth moment; the second interruption message carries a second target subframe identifier; the CB unit sends first uplink IQ data to the BBU unit after the Mth moment; the second target subframe identifier indicates that the BBU unit receives first uplink IQ data sent by the CB unit on a subframe corresponding to the second target subframe identifier, and stores second uplink IQ data in a network card queue of the DPDK network card to a memory space of the BBU unit; and the second uplink IQ data is uplink IQ data sent by the CB unit and received by the BBU unit at the M-1 moment.

In this embodiment, the second interrupt message carries a second target-subframe indicator, where the second target-subframe indicator may include at least one of a numerical value, a character, and an english letter, and for example, the second target-subframe indicator may be SF0, SF1, or the like. Further, the second interrupt message is also used to trigger the BBU unit to receive the uplink IQ data. When the second target subframe identifier corresponds to an uplink subframe or an uplink special subframe, the BBU unit may receive the first uplink IQ data from the CB unit, and at the same time, the BBU unit may further execute bottom software to store the second uplink IQ data in the network card queue of the DPDK network card to a memory space of the BBU unit; and the second uplink IQ data is uplink IQ data sent by the CB unit and received by the BBU unit at the M-1 moment.

The second uplink IQ data sent by the CB unit and received by the BBU unit at the M-1 moment is received by bottom software, so that the receiving of the first uplink IQ data is not influenced, namely, the first uplink IQ data is received and the second uplink IQ data received at the last moment is stored by the software of different layers, and the first uplink IQ data and the second uplink IQ data are not influenced mutually, so that the conflict between the storage data and the receiving data of the BBU unit is avoided, and the data sending accuracy is improved; in addition, the bottom layer software is used for storing the uplink IQ data received at the M-1 th time in the memory space of the BBU unit to the memory space of the BBU unit so as to complete the reception of the uplink IQ data, and the first uplink IQ data is received and the second uplink IQ data is stored at the same time, so that the reception efficiency of the uplink IQ data can be improved, and the real-time requirement of communication is improved.

Optionally, the mth time is a time corresponding to the mth 1PPS plus a preset compensation duration. Further, the preset compensation duration is a duration determined according to a time delay, and the time delay includes at least one of the following: delay generated when a network packet corresponding to IQ data is transmitted between the BBU unit and the CB unit; the IQ data comprises downlink IQ data and uplink IQ data; the inherent time delay corresponding to the CB unit, the extension unit and the remote unit respectively, the transmission time delay between the CB unit and the extension unit and the transmission time delay between the extension unit and the remote unit.

In a data transmission method provided in another embodiment, the method may further include: the CB unit receives a monitoring instruction sent by the BBU unit; the monitoring instruction is used for acquiring monitoring data; and the CB unit sends the monitoring data after the protocol conversion to the BBU unit according to the monitoring instruction.

Specifically, in this embodiment, the monitoring instruction may be an instruction that instructs the CB unit to send monitoring data to the BBU unit. The monitoring data may include at least one of configuration data of each monitoring parameter of the CB unit, read data of each monitoring parameter of the CB unit, upgrade data of the CB unit, restart data of the CB unit, and log collection data of the CB unit.

Optionally, the BBU unit may send the monitoring instruction to the CB unit at regular time or according to a preset period, and correspondingly, the CB unit may obtain the monitoring data of the CB unit by using the monitoring system of the CB unit according to the received monitoring instruction sent by the BBU unit, and send the obtained monitoring data of the CB unit to the BBU unit.

Optionally, the monitoring instruction is further configured to instruct the CB unit to perform upgrading, and the data transmission method further includes: and the CB unit carries out upgrading operation on the CB unit according to the monitoring instruction.

It should be understood that, although the steps in the flowcharts of fig. 2 to 5 are shown in sequence as indicated by the arrows, the steps are not necessarily performed in sequence as indicated by the arrows. The steps are not performed in the exact order shown and described, and may be performed in other orders, unless explicitly stated otherwise. Moreover, at least some of the steps in fig. 2-5 may include multiple sub-steps or multiple stages that are not necessarily performed at the same time, but may be performed at different times, and the order of performing the sub-steps or stages is not necessarily sequential, but may be performed in turn or alternately with other steps or at least some of the sub-steps or stages of other steps.

In one embodiment, a computer-readable storage medium is provided, having a computer program stored thereon, which when executed by a processor, performs the steps of:

It will be understood by those skilled in the art that all or part of the processes of the methods of the embodiments described above can be implemented by hardware related to instructions of a computer program, which can be stored in a non-volatile computer-readable storage medium, and when executed, can include the processes of the embodiments of the methods described above. Any reference to memory, storage, database, or other medium used in the embodiments provided herein may include non-volatile and/or volatile memory, among others. Non-volatile memory can include read-only memory (ROM), Programmable ROM (PROM), Electrically Programmable ROM (EPROM), Electrically Erasable Programmable ROM (EEPROM), or flash memory. Volatile memory can include Random Access Memory (RAM) or external cache memory. By way of illustration and not limitation, RAM is available in a variety of forms such as Static RAM (SRAM), Dynamic RAM (DRAM), Synchronous DRAM (SDRAM), Double Data Rate SDRAM (DDRSDRAM), Enhanced SDRAM (ESDRAM), Synchronous Link DRAM (SLDRAM), Rambus Direct RAM (RDRAM), direct bus dynamic RAM (DRDRAM), and memory bus dynamic RAM (RDRAM).

The technical features of the above embodiments can be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the above embodiments are not described, but should be considered as the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above examples only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims

1. An indoor distributed system, comprising: the system comprises a baseband processing BBU unit, a protocol conversion CB unit, an extension unit and a remote unit, wherein the CB unit is respectively in communication connection with the BBU unit and the extension unit, and the extension unit is in communication connection with the remote unit;

the CB unit is used for respectively carrying out protocol conversion on the data received from the extension unit and the BBU unit and sending timing information to the BBU unit; the timing information is a first interrupt message sent by the CB unit at the Nth moment and is used for indicating the BBU unit to send downlink data or receive uplink data; the first interrupt message carries a first target subframe identifier;

the BBU unit is configured to send downlink in-phase quadrature IQ data to the CB unit on a downlink subframe corresponding to the first target subframe identifier, and store the downlink IQ data to be sent at the N +1 th time in a memory space of the BBU unit to a cache space of the BBU unit.

2. The indoor distributed system according to claim 1, wherein the BBU unit includes a direct memory access DMA control unit, a data plane development kit DPDK network card, and a CPU; the DMA control unit is connected with the DPDK network card, and the CPU is respectively connected with the DMA control unit and the DPDK network card.

3. The indoor distributed system according to claim 2, wherein the DMA control unit is configured to determine the downlink IQ data corresponding to the first target subframe id according to the first target subframe id; writing the downlink IQ data in the cache space of the BBU into a network card queue in the DPDK network card;

the DPDK network card is used for determining the priority of the downlink IQ data;

the CPU is configured to determine a transmission order of the downlink IQ data according to the priority of the downlink IQ data, and transmit the downlink IQ data when the transmission order of the downlink IQ data arrives.

4. The indoor distributed system of claim 1, wherein the nth time corresponds to the nth pulse per second 1PPS minus a predetermined compensation duration.

5. The indoor distributed system of claim 4, wherein the predetermined compensation duration is a duration determined according to a time delay, wherein the time delay comprises at least one of:

a time delay generated when a network packet corresponding to the IQ data is transmitted between the BBU unit and the CB unit; the IQ data comprises downlink IQ data and uplink IQ data;

the CB unit, the extension unit and the remote unit respectively correspond to inherent time delay;

a transmission delay between the CB unit and the extension unit;

a transmission delay between the extension unit and the remote unit.

6. The indoor distributed system of claim 2, wherein the BBU unit is further configured to send a monitoring instruction to the CB unit;

and the CB unit is also used for sending monitoring data to the BBU unit according to the monitoring instruction.

7. The indoor distributed system according to claim 6, wherein the CPU is configured to write the monitoring instruction from the memory space of the BBU unit to the cache space of the BBU unit;

the DMA control unit is used for writing the monitoring instruction into a network card queue in the DPDK network card from the cache space of the BBU unit;

the DPDK network card is used for determining the priority of the monitoring instruction;

and the CPU is also used for determining the sending sequence of the monitoring instructions according to the priority of the monitoring instructions and sending the monitoring instructions when the sending sequence of the monitoring instructions arrives.

8. The indoor distributed system according to claim 6, wherein the DPDK network card is configured to determine a priority of the monitoring data; determining a receiving sequence of the monitoring data according to the priority of the monitoring data, receiving the monitoring data when the receiving sequence of the monitoring data arrives, and writing the monitoring data into a network card queue of the DPDK network card;

the CPU is further configured to write the monitoring data from the network card queue of the DPDK network card into the cache space of the BBU unit, and write the monitoring data in the cache space of the BBU unit into the memory space of the BBU unit.

9. An indoor distributed system, comprising: the system comprises a baseband processing BBU unit, a protocol conversion CB unit, an extension unit and a remote unit, wherein the CB unit is respectively in communication connection with the BBU unit and the extension unit, and the extension unit is in communication connection with the remote unit;

the CB unit is used for respectively carrying out protocol conversion on the data received from the extension unit and the BBU unit and sending timing information to the BBU unit; the timing information is a second interrupt message sent by the CB unit at the Mth moment, and is used for indicating the BBU unit to send downlink data or receive uplink data; the second interrupt message carries a second target subframe identifier;

the CB unit is further used for sending first uplink in-phase quadrature (IQ) data to the BBU unit after the Mth moment;

the BBU unit is configured to receive the first uplink IQ data sent by the CB unit, and store second uplink IQ data in a network card queue of the DPDK network card to a memory space of the BBU unit; the second uplink IQ data is the uplink IQ data sent by the CB unit and received by the BBU unit at the M-1 th moment.

10. The indoor distributed system according to claim 9, wherein the BBU unit includes a direct memory access DMA control unit, a data plane development kit DPDK network card, and a CPU; the DMA control unit is connected with the DPDK network card, and the CPU is respectively connected with the DMA control unit and the DPDK network card.

11. The indoor distributed system according to claim 10, wherein the DPDK network card is configured to determine a priority of the first uplink IQ data, determine a receiving order of the first uplink IQ data according to the priority of the first uplink IQ data, and receive the first uplink IQ data when the receiving order of the first uplink IQ data arrives;

the CPU is further configured to write the second uplink IQ data into a cache space of the BBU unit, and write the second uplink IQ data in the cache space of the BBU unit into a memory space of the BBU unit.

12. The indoor distributed system of claim 9, wherein the mth time is a time corresponding to the mth pulse 1PPS plus a preset backoff time.

13. The indoor distributed system of claim 12, wherein the predetermined compensation duration is a duration determined according to a time delay, wherein the time delay comprises at least one of:

a transmission delay between the CB unit and the extension unit;

a transmission delay between the extension unit and the remote unit.

14. The indoor distributed system of claim 10, wherein the BBU unit is further configured to send a monitoring instruction to the CB unit;

15. The indoor distributed system according to claim 14, wherein said CPU is configured to write the monitoring instruction from a memory space of the BBU unit to a cache space of the BBU unit;

16. The indoor distributed system according to claim 14, wherein the DPDK network card is configured to determine priority of the monitoring data; determining a receiving sequence of the monitoring data according to the priority of the monitoring data, receiving the monitoring data when the receiving sequence of the monitoring data arrives, and writing the monitoring data into a network card queue of the DPDK network card;

17. A data transmission method, characterized in that the data transmission method comprises:

the base band processing BBU unit receives timing information sent by the protocol conversion CB unit; the timing information is a first interrupt message sent by the CB unit at the Nth moment and is used for indicating the BBU unit to send downlink data or receive uplink data; the first interrupt message carries a first target subframe identifier; the CB unit is also used for respectively carrying out protocol conversion on data received from the expansion unit and the BBU unit;

and the BBU unit sends downlink IQ data to the CB unit on a downlink subframe corresponding to the first target subframe identifier according to the first target subframe identifier, and stores the downlink IQ data to be sent at the (N + 1) th moment in the memory space of the BBU unit to the cache space of the BBU unit.

18. The data transmission method of claim 17, further comprising:

the BBU unit sends a monitoring instruction to the CB unit, and the monitoring instruction is used for acquiring monitoring data;

and the BBU unit receives the monitoring data sent by the CB unit according to the monitoring instruction.

19. A data transmission method, characterized in that the data transmission method comprises:

the base band processing BBU unit receives timing information sent by the protocol conversion CB unit; the timing information is a second interrupt message sent by the CB unit at the Mth moment and used for indicating the BBU unit to send downlink data or receive uplink data; the second interrupt message carries a second target subframe identifier; the CB unit is also used for respectively carrying out protocol conversion on data received from the expansion unit and the BBU unit;

the BBU unit receives first uplink in-phase quadrature (IQ) data sent by the CB unit after the Mth moment and stores second uplink IQ data to a memory space of the BBU unit; the second uplink IQ data is the uplink IQ data sent by the CB unit and received by the BBU unit at the M-1 th moment.

20. The data transmission method of claim 19, further comprising:

21. A data transmission method, characterized in that the data transmission method comprises:

the protocol conversion CB unit respectively performs protocol conversion on data received from the extension unit and the baseband processing BBU unit and sends timing information to the BBU unit; the timing information is a first interrupt message sent by the CB unit at the Nth moment and is used for indicating the BBU unit to send downlink data or receive uplink data; the first interrupt message carries a first target subframe identifier; the first target subframe identifier is used for indicating the BBU unit to send downlink IQ data to the CB unit on a downlink subframe corresponding to the first target subframe identifier, and storing the downlink IQ data to be sent at the N +1 th time in a memory space of the BBU unit to a cache space of the BBU unit;

and the CB unit is in data communication with the extension unit and the BBU unit respectively based on the data after protocol conversion.

22. A data transmission method, characterized in that the data transmission method comprises:

the protocol conversion CB unit respectively performs protocol conversion on data received from the extension unit and the baseband processing BBU unit;

the CB unit sends timing information to the BBU unit; the timing information is a second interrupt message sent by the CB unit at the Mth moment, and is used for indicating the BBU unit to send downlink data or receive uplink data; the second interrupt message carries a second target subframe identifier;

the CB unit sends first uplink in-phase quadrature (IQ) data to the BBU unit after the Mth moment;

the second target subframe identifier indicates that the BBU unit receives the first uplink IQ data sent by the CB unit on a subframe corresponding to the second target subframe identifier, and stores second uplink IQ data in a network card queue of a DPDK network card to a memory space of the BBU unit; the second uplink IQ data is the uplink IQ data sent by the CB unit and received by the BBU unit at the M-1 th moment.

23. A computer-readable storage medium, on which a computer program is stored, which, when being executed by a processor, carries out the steps of the method according to any one of claims 17 to 22.