WO2016188184A1

WO2016188184A1 - Data transmission method and device

Info

Publication number: WO2016188184A1
Application number: PCT/CN2016/075983
Authority: WO
Inventors: 何俊; 陈宗琮
Original assignee: 中兴通讯股份有限公司
Priority date: 2015-05-26
Filing date: 2016-03-09
Publication date: 2016-12-01
Also published as: CN106302166B; CN106302166A

Abstract

Disclosed are a data transmission method and device. The method comprises: when N radio remote units (RRU) uplink transmit data to a building baseband unit (BBU), receiving and then encapsulating, by an OLT, common public radio interface (CPRI) data of the N RRUs; performing, by the OLT, convergence on the encapsulated CPRI data of the N RRUs, then forwarding, by the OLT, the same to the BBU; and parsing, by the BBU, the converged data by the OLT to acquire the encapsulated CPRI data of the N RRUs, and respectively decapsulating, by the BBU, the acquired data to acquire the CPRI data of the N RRUs. When the BBU downlink transmits data to the N RRUs, the OLT receives the CPRI data encapsulated by the BBU and sent to the N RRUs, then decapsulates the encapsulated data, and respectively forwards to the N RRUs the CPRI data acquired from decapsulation and sent to the N RRUs by the BBU.

Description

Data transmission method and device

Technical field

This application relates to, but is not limited to, optical communication technology.

Background technique

The third-generation communication or the fourth-generation communication (3G/4G) network mostly uses a distributed base station architecture, and a fiber-optic connection is used between a Radio Remote Unit (RRU) and a Building Baseband Unit (BBU). A BBU connects multiple RRUs through multiple ports. The BBU is generally installed in the central computer room, and the RRU is generally installed in each divided unit or different floors of the large stadium. The BBU and the RRU are connected using a Common Public Radio Interface (CPRI). A typical topology networking diagram is shown in Figure 1.

The optical fiber is transmitted between the BBU and the RRU, and the RRU is connected to the antenna through a coaxial cable and a power splitter. That is, the trunk uses optical fiber and the branch uses coaxial cable. Upstream direction (user signal transmission direction): The signal of the user equipment is received by the nearest RRU channel, and then transmitted from the channel to the base station through the optical fiber. Downstream direction (user signal receiving direction): The optical fiber is directly connected to the RRU from the BBU, and the baseband digital signal is transmitted between the BBU and the RRU, so that the base station can control a certain user's signal to be transmitted from the designated RRU channel, thereby reducing the other User interference on the channel.

Summary of the invention

The following is an overview of the topics detailed in this document. This Summary is not intended to limit the scope of the claims.

The networking of the related technologies has the following disadvantages: the BBU and the RRU are directly connected through the optical fiber, and are limited to the interface of the BBU. When the number of RRUs is relatively large, a large number of BBU interfaces are required. Therefore, the networking cost of the networking is high. In addition, since the BBU and the RRU are directly connected through the optical fiber, the bandwidth occupied by the RRU is relatively fixed, and bandwidth control is not supported.

This document provides a data transmission method and device, which can reduce the network infrastructure cost and control the bandwidth occupied by the RRU.

A data transmission method, the optical line terminal OLT is connected between the baseband processing unit BBU and the N radio remote units RRU, where N is a natural number, and the method includes:

Receiving, by the OLT, general public radio interface CPRI data of the N RRUs transmitted by the N RRUs;

The OLT encapsulates the received CPRI data of the N RRUs according to a preset encapsulation technology;

The OLT performs aggregation processing on the encapsulated CPRI data of the N RRUs and forwards the data to the BBU.

Optionally, after the OLT performs the aggregation processing on the encapsulated CPRI data of the N RRUs, the method further includes:

Obtaining, by the BBU, the CPRI data of the encapsulated N RRUs after parsing the aggregated data sent by the OLT, and respectively performing the obtained according to the decapsulation technology corresponding to the preset encapsulation technology The encapsulated CPRI data of the N RRUs are decapsulated to obtain CPRI data of the N RRUs.

Optionally, before the OLT receives the common public radio interface CPRI data of the N RRUs that are transmitted by the N RRUs, the method further includes:

The working mode parameter is determined after the OLT is connected to the RRU; the working mode parameter includes: an operating wavelength, a transceiver mode, and a transmission rate.

Optionally, determining the working mode parameters after the OLT is connected to the RRU includes:

Determining, by the OLT, the operating mode parameter after receiving a command for indicating the working mode parameter; or

The working mode parameter is determined after the OLT negotiates and adapts with the RRU.

Optionally, the preset packaging technology includes:

Ethernet VLAN stacking, multi-protocol label switching MPLS encapsulation, circuit emulation service CES encapsulation.

Receiving, by the OLT, the data encapsulated by the BBU to the common public radio interface CPRI data of the N RRUs according to a preset encapsulation technology;

After receiving the encapsulated data, the OLT decapsulates the encapsulated data according to a decapsulation technology corresponding to the preset encapsulation technology, and obtains CPRI data sent by the BBU to the N RRUs. ;

The OLT forwards the CPRI data sent by the BBU to the N RRUs to the N RRUs.

Optionally, before the OLT receives the data encapsulated by the BBU to the common public radio interface CPRI data of the N RRUs according to the preset encapsulation technology, the method further includes:

Optionally, the preset packaging technology includes:

An optical line terminal OLT includes:

N user side interface units connected to the N remote radio unit RRUs, where N is a natural number, an uplink interface unit connected to the baseband processing unit BBU, and a convergence forwarding unit;

The user side interface unit includes: a first encapsulation module and a first decapsulation module;

The first encapsulating module is configured to: respectively encapsulate the received CPRI data of the RRU according to a preset encapsulation technology;

The first decapsulation module is configured to: after the received encapsulated BBU is sent to the CPRU data of the RRU according to the decapsulation technology corresponding to the preset encapsulation technology, respectively Obtaining CPRI data sent by the BBU to the RRU after decapsulation;

The aggregation forwarding unit includes: a convergence module and a forwarding module;

The aggregation module is configured to: after the encapsulated CPRI data of the N RRUs are aggregated, and then forwarded to the BBU through the uplink interface unit;

The forwarding module is configured to: forward the received encapsulated BBUs to the Nth RRUs and forward the CPRI data to the N user-side interface units.

Optionally, the user side interface unit further includes:

The interface matching module is configured to: determine a working mode parameter after being connected to the RRU; and the working mode parameter includes: an operating wavelength, a transceiver mode, and a transmission rate.

Optionally, the interface matching module is set to:

Determining the working mode parameter after receiving a command for indicating the working mode parameter; or

The working mode parameter is determined after being negotiated and adapted with the RRU.

Optionally, the preset packaging technology includes:

A base station processing unit BBU includes: a second encapsulation module and a second decapsulation module;

The second encapsulating module is configured to: encapsulate the common public radio interface CPRI data sent by the BBU to the N radio remote units RRU according to a preset encapsulation technology, and then send the data to the optical line terminal OLT, where N is a natural number;

The second decapsulation module is configured to: after parsing the aggregated data sent by the OLT, obtain the CPRI data of the encapsulated N RRUs, and according to a solution corresponding to the preset encapsulation technology The encapsulation technology obtains the CPRI data of the N RRUs after decapsulating the obtained CPRI data of the encapsulated N RRUs.

Optionally, the preset packaging technology includes:

A computer readable storage medium storing computer executable instructions, the computer being executable The line instructions are used to perform the method of any of the above.

The embodiment of the present invention provides a data transmission method and apparatus. The optical line terminal OLT is connected between the baseband processing unit BBU and the N radio remote units RRU, where N is a natural number; when N RRUs transmit data to the BBU, The OLT receives the common public radio interface CPRI data of the N RRUs that are transmitted by the N RRUs; the OLT encapsulates the received CPRI data of the N RRUs according to a preset encapsulation technology; After the OLT aggregates the CPRI data of the encapsulated N RRUs, the OLT forwards the data to the BBUs; the BBU parses the aggregated data sent by the OLT to obtain the encapsulated N RRUs. Obtaining CPRI data of the N RRUs after decapsulating the obtained CPRI data of the encapsulated N RRUs according to the decapsulation technology corresponding to the preset encapsulation technology. When the BBU downlinks the data to the N RRUs, the OLT receives the data encapsulated by the BBU to the common public radio interface CPRI data of the N RRUs according to a preset encapsulation technique; the OLT receives After the encapsulated data is obtained, the encapsulated data is decapsulated according to the decapsulation technology corresponding to the preset encapsulation technology, and the CPRI data sent by the BBU to the N RRUs is obtained; The OLT forwards the CPRI data sent by the BBU to the N RRUs to the N RRUs. With the solution provided by the embodiment of the present invention, the networking cost of the networking can be reduced, and the bandwidth occupied by the RRU can be controlled and adjusted.

Other aspects will be apparent upon reading and understanding the drawings and detailed description.

BRIEF abstract

FIG. 1 is a network diagram of a BBU and an RRU topology in the related art;

2 is a topology networking diagram of an OLT and an ONU in related art;

3 is a schematic diagram of a logical structure of a related art OLT;

4 is a topology networking diagram of a BBU, an RRU, and an OLT according to an embodiment of the present invention;

FIG. 5 is a schematic flowchart of a data transmission method according to an embodiment of the present disclosure;

FIG. 6 is a schematic flowchart diagram of another data transmission method according to an embodiment of the present disclosure;

FIG. 7 is a schematic diagram of a logical structure of an OLT according to an embodiment of the present disclosure;

FIG. 8 is a schematic diagram of a logical structure of a BBU according to an embodiment of the present disclosure;

FIG. 9 is a schematic diagram of a logical structure of an OLT supporting receiving and collecting multiple RRU signals according to Embodiment 2 of the present invention;

FIG. 10 is a structural diagram of a package encapsulating CPRI data according to Embodiment 2 of the present invention;

FIG. 11 is a schematic diagram of a logical structure of a BBU supporting receiving aggregated multiple RRU signals from an OLT according to Embodiment 2 of the present invention;

FIG. 12 is a schematic diagram of a forwarding table used by a BBU in Embodiment 2 according to an embodiment of the present invention.

Embodiments of the invention

Embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be noted that, in the case of no conflict, the features in the embodiments and the embodiments in the present application may be arbitrarily combined with each other.

The steps illustrated in the flowchart of the figures may be executed in a computer system such as a set of computer executable instructions. Also, although logical sequences are shown in the flowcharts, in some cases the steps shown or described may be performed in a different order than the ones described herein.

In the embodiment of the present invention, an optical line terminal (OLT) device is introduced as an intermediate transmission node between the BBU and the RRU. The OLT device is the most important central office device in the application of the Passive Optical Network (PON) technology. It implements the functions of: 1. Providing multiple PON ports through optical distribution network (ODN) fibers. It is connected to the Optical Network Unit (ONU) of the terminal equipment. The connection topology can be point-to-point or point-to-multipoint. In terms of implementation technology, multiple ONUs can share a certain wavelength of time division multiplexing mode, or multiple ONUs can separately occupy wavelength division multiplexing modes of different wavelengths, or can be a combination of the above two multiplexing modes, that is, multiple ONUs share a certain One wavelength, while other multiple ONUs respectively occupy multiple wavelengths; 2. Implement control, management, and maintenance functions for the ONU of the terminal device. 3. Realize convergence access to multiple terminal services. As shown in Figure 2, it is a topology networking diagram of the OLT and the ONU.

The OLT device has the structure shown in Figure 3. The user-side port can be an Ethernet PON (EPON) or a Gigabit-Capable PON (Gigabit-Capable PON). GPON), 10 Gigabit-Capable EPON (10G-EPON), 10 Gigabit-Capable PON (10G-GPON), next-generation passive optical network (Next- Generation PON, NG-PON, and other access modes. The access mode of a port can be manually switched through the configuration command of the OLT, or it can be automatically switched after being negotiated and matched with the interface of the peer device.

In the embodiment of the present invention, on the basis of the traditional BBU-RRU networking architecture, the RRUs are aggregated by the access layer OLT device of the current scale, and multiple user-side interfaces of the OLT are respectively connected to multiple RRUs, and the received multiple channels are connected. The RRU signals are connected to the BBU through the uplink optical interface of the OLT device. The point-to-point connection between the traditional BBU and the RRU is changed to a point-to-multipoint connection. As shown in FIG. 4, it is a topology networking diagram proposed in the embodiment of the present invention.

The embodiment of the present invention provides a data transmission method, where the method is applied to the RRU to transmit data to the BBU, and the OLT is connected between the BBU and the N RRUs, where N is a natural number. As shown in FIG. 5, the method includes:

Step 101: The OLT receives CPRI data of the N RRUs transmitted by the N RRUs.

Step 102: The OLT encapsulates the received CPRI data of the N RRUs according to a preset encapsulation technology.

Step 103: The OLT performs aggregation processing on the encapsulated CPRI data of the N RRUs and forwards the data to the BBU.

After the step 103, the method may further include:

Step 104: The BBU parses the aggregated data sent by the OLT, and obtains the CPRI data of the encapsulated N RRUs, and respectively obtains the CPRI data according to the decapsulation technology corresponding to the preset encapsulation technology. The CPRI data of the encapsulated N RRUs is decapsulated to obtain CPRI data of the N RRUs.

Before the step 101, the method may further include:

Step 100: The working mode parameter is determined after the OLT is connected to the RRU; the working mode parameter includes: an operating wavelength, a transceiver mode, and a transmission rate.

Step 100 can include:

The preset packaging technology includes:

Ethernet VLAN (Virtual Local Area Network) (VLAN STACKING) encapsulation, Multi-Protocol Label Switching (MPLS) encapsulation, and Circuit Emulation Service (CES) encapsulation.

A data transmission method is provided by the embodiment of the present invention, the OLT receives CPRI data of the N RRUs transmitted by the N RRUs, and the OLT separately receives the received N RRUs according to a preset encapsulation technology. The CPRI data is encapsulated; the OLT aggregates the CPRI data of the encapsulated N RRUs and forwards the data to the BBU. In the technical solution provided by the embodiment of the present invention, the OLT can be used as an intermediate node to enable the BBU to connect to more RRUs, which can reduce the network infrastructure cost, and the OLT can control and adjust the bandwidth occupied by the RRU.

The embodiment of the present invention further provides another data transmission method, which is applied to the BBU downlink transmission data to the RRU, and the OLT is connected between the BBU and the N RRUs, where N is a natural number. As shown in FIG. 6, the method includes:

Step 201: The OLT receives data encapsulated by the BBU to the CPRI data of the N RRUs according to a preset encapsulation technique.

Step 202: After receiving the encapsulated data, the OLT decapsulates the encapsulated data according to a decapsulation technology corresponding to the preset encapsulation technology, and then sends the BBU to the N RRUs. CPRI data.

Step 203: The OLT forwards the CPRI data sent by the BBU to the N RRUs to the N RRUs.

Before step 201, the method may further include:

Step 200: The OLT is connected to the RRU to determine an operating mode parameter. The working mode parameter includes: an operating wavelength, a transceiver mode, and a transmission rate.

Step 200 can include:

Determining, by the OLT, a command for indicating the working mode parameter, determining the working mode parameter Number; or

The preset packaging technology includes:

According to another data transmission method provided by the embodiment of the present invention, the OLT receives data encapsulated by the BBU to the CPRI data of the N RRUs according to a preset encapsulation technology; the OLT receives the After the encapsulated data is decapsulated according to the decapsulation technology corresponding to the preset encapsulation technology, the encapsulated data is decapsulated to obtain CPRI data sent by the BBU to the N RRUs; The CPRI data sent by the BBU to the N RRUs is respectively forwarded to the N RRUs. In the technical solution provided by the embodiment of the present invention, the OLT can be used as an intermediate node to enable the BBU to connect to more RRUs, which can reduce the network infrastructure cost, and the OLT can control and adjust the bandwidth occupied by the RRU.

An OLT is provided in the embodiment of the present invention. As shown in FIG. 7, the OLT includes:

N user-side interface units 73 connected to the N RRUs, N is a natural number, an uplink interface unit 71 connected to the BBU, and a convergence forwarding unit 72;

The user side interface unit 73 includes: a first encapsulation module 731 and a first decapsulation module 732;

The first encapsulating module 731 is configured to: respectively encapsulate the received CPRI data of the RRU according to a preset encapsulation technology;

The first decapsulation module 732 is configured to: after decapsulating the received encapsulated BBUs to the CPRU data of the RRU according to the decapsulation technology corresponding to the preset encapsulation technology, respectively CPRI data sent by the BBU to the RRU;

The aggregation forwarding unit 72 includes: a convergence module 721 and a forwarding module 722;

The aggregation module 721 is configured to: after the encapsulated CPRI data of the N RRUs are aggregated, and then forwarded to the BBU through the uplink interface unit 71;

The forwarding module 722 is configured to forward the received encapsulated BBUs to the N RRUs and forward the CPRI data to the N user-side interface units 73.

As shown in FIG. 7, the user side interface unit 73 further includes:

The interface matching module 733 is configured to: determine a working mode parameter after being connected to the RRU; the working mode parameter includes: an operating wavelength, a transceiver mode, and a transmission rate.

The interface matching module 733 is configured to:

The preset packaging technology includes:

This embodiment is used to implement the foregoing method embodiments. For the working process and working principle of each unit in this embodiment, refer to the description in the foregoing method embodiments, and details are not described herein again.

The OLT provided by the embodiment of the present invention is connected to the BBU through the uplink interface unit, and is connected to the N RRUs through the N user-side interface units. The package in the user-side interface unit is used when the RRU transmits data to the BBU. The module encapsulates the received CPRI data of the RRU according to a preset encapsulation technique, and the aggregation module in the convergence and forwarding unit aggregates the CPRI data of the encapsulated N RRUs through the upper The interface unit is forwarded to the BBU; when the BBU downlinks the data to the N RRUs, the forwarding module in the aggregation and forwarding unit sends the received BBUs to the Nth RRUs. After being respectively forwarded to the N user-side interface units, the decapsulation module in the user-side interface unit sends the encapsulated BBUs according to the decapsulation technology corresponding to the preset encapsulation technology. After decapsulating the CPRI data of the RRU, the CPRI data sent by the BBU to the RRU is obtained. In the technical solution provided by the embodiment of the present invention, the OLT can be used as an intermediate node to enable the BBU to connect to more RRUs, which can reduce the network infrastructure cost, and the OLT can control and adjust the bandwidth occupied by the RRU.

The embodiment of the present invention provides a BBU, as shown in FIG. 8, the BBU includes: a second encapsulation module 81 and a second decapsulation module 82;

The second encapsulating module 81 is configured to: encapsulate the CPRI data sent by the BBU to the N RRUs to the OLT according to a preset encapsulation technique, where N is a natural number;

The second decapsulation module 82 is configured to: after parsing the aggregated processed data sent by the OLT, obtain the CPRI data of the encapsulated N RRUs, and according to the preset encapsulation technology The decapsulation technology obtains the CPRI data of the N RRUs after decapsulating the obtained CPRI data of the encapsulated N RRUs.

The preset packaging technology includes:

The BBU provided by the embodiment of the present invention is connected to the OLT through the uplink interface unit of the OLT. When the BBU transmits data to the N RRUs, the BBU encapsulation module sends the BBU to N according to a preset encapsulation technology. The CPRI data of the RRU is separately encapsulated and sent to the OLT. When the RRU transmits data to the BBU, the decapsulation module of the BBU parses the aggregated data sent by the OLT, and obtains the CPRI data of the encapsulated N RRUs according to the preset package. The technology corresponding decapsulation technology obtains the CPRI data of the N RRUs after decapsulating the obtained CPRI data of the encapsulated N RRUs. In the technical solution provided by the embodiment of the present invention, the OLT can be used as an intermediate node to enable the BBU to connect to more RRUs, which can reduce the network infrastructure cost, and the OLT can control and adjust the bandwidth occupied by the RRU.

The following is a detailed description by way of examples:

Embodiment 1

In this embodiment, the process of transmitting data between the RRU and the BBU through the OLT includes:

The user-side interface unit of the OLT establishes a point-to-point physical connection with the RRU through the optical fiber.

The working mode of the user-side interface unit of the OLT is manually switched by the configuration command or automatically switched after being negotiated and matched with the peer device interface. This mode of operation needs to determine at least the following three parameters:

1) Working wavelength. The command on the OLT is used to specify that the user-side interface unit works in a certain wavelength state; or the user-side interface unit periodically switches its own transmit and receive wavelengths. Monitor the receiving and transmitting wavelengths of the peer RRU device, and then switch its own sending and receiving wavelengths to pair with the peer RRU device to complete the wavelength adaptation.

2) Working mode. Considering the requirements of 3G/4G service transmission quality, the user-side interface unit of the OLT operates in the point-to-point transmission and reception mode of the group of wavelengths after determining the working wavelength.

3) Transmission rate. The user-side interface unit of the OLT supports eight typical CPRI rates, which are manually or automatically switched according to the serial digital rate of the RRU.

In the uplink direction, the user-side interface unit of the OLT encapsulates the received CPRI data, and optionally encapsulates various technologies, such as VLAN STACKING encapsulation, MPLS encapsulation, and CES encapsulation. The encapsulated CPRI data is forwarded to the OLT uplink interface unit through the aggregation forwarding unit of the OLT. In the downlink direction, the user-side interface interface unit of the OLT checks that the outer VLAN and the inner VLAN ID of the received VLAN STACKING data are the same as the outer VLAN and inner VLAN ID added when the uplink is encapsulated. The data packet is subjected to VLAN STACKING decapsulation of the data packet to restore the CPRI data and sent to the RRU device connected thereto.

In the uplink direction, the BBU device connected to the OLT decapsulates the Ethernet packet encapsulated in the VLAN STACKING received from the OLT, and maps to the original RRU device branch according to the outer and inner VLAN IDs in the encapsulation format. , the high-speed interface unit for CPRI protocol analysis and data processing. In the downstream direction, the high-speed interface unit of the BBU sends data services to different destination RRU devices, and then the BBU encapsulates the data services into Ethernet packets with different outer VLANs and inner VLAN IDs according to the RRU branch number, OLT. After receiving, the user-side interface unit is forwarded to different OLTs via the convergence forwarding unit.

Embodiment 2:

FIG. 9 is a schematic diagram of a logical structure of an OLT supporting receiving and collecting multiple RRU signals according to an embodiment of the present invention. As shown in Figure 9, the user-side interface unit of the OLT receives the CPRI data of the RRU and adapts, encapsulates, aggregates, and forwards the following:

The interface adaptation module 301 interfaces with the RRU device, for example, the RRU interface type is option1, and the rate is CPRI line bit rate option 1:614.4 Mbit/s, 8B/10B line coding(1) x 491.52x 10/8Mbit/s). The user-side interface unit of the OLT specifies that the user-side interface unit works in a certain group of wavelength states by using the command line switching mode; or the user-side interface unit periodically switches its own receiving and receiving wavelengths, and monitors the receiving and transmitting wavelengths of the peer RRU device. Then switch its own transmit and receive wavelengths to pair with the peer RRU device to complete the wavelength adaptation.

After determining the working wavelength, the interface adapting module 301 adjusts the wavelength to the point-to-point working mode, so that the user-side interface unit and the peer RRU device are point-to-point transmission models, and the wavelength link channel is exclusively occupied. The interface adaptation module 301 adjusts the port transmission and reception rate to 614.4 BMbit/s according to the CPRI data transmission rate of the peer RRU device, and completes the physical layer and link layer connection with the RRU device.

After receiving the CPRI data sent by the interface adaptation module 301, the encapsulation/decapsulation module 302 performs Ethernet VLAN stack encapsulation, as shown in FIG. The Ethernet source media access control (MAC) address and destination MAC address can be borrowed from the traditional PW pseudowire MAC address segment. For example, the destination MAC address is specified as 00-15-EB-7F-EF-FF, and the source MAC address is used. Based on the 00-15-EB-7F-E0-01, the physical slot number and port number of the OLT are mapped according to the OLT user-side interface. In the virtual local area network (VLAN), the outer VLAN selects a VLAN ID that is not planned for the current OLT, such as 4001-4016. The inner VLAN is optional or not used. If the inner VLAN is not used, the OLT uses the outer VLAN to uniquely identify the service flow (the data flow between the BBU and an RRU) for service encapsulation and forwarding. In this case, when an OLT is connected to multiple RRUs through multiple user-side interfaces, it will occupy more outer VLAN resources. It is recommended to use an inner VLAN. The inner VLAN can be mapped based on the physical slot number and port number of the OLT on the OLT user-side interface. In this way, multiple RRU devices connected to the OLT can be uniquely identified by the outer VLAN together with the inner VLAN.

For example, after the RRU device connected to port 1 of the OLT slot 1 is encapsulated in the Ethernet layer by the encapsulation/decapsulation module 302, the destination MAC address of the Ethernet frame is 00-15-EB-7F-EF-FF. The source MAC address is 00-15-EB-7F-E0-01, the outer VLAN is 4001, and the inner VLAN is 1001. The original CPRI model is packaged into the payload portion of the Ethernet frame. After the package is completed, the FCS check is performed again, and the result is filled in the last 4 bytes.

For example, after the RRU device connected to port 2 of the OLT slot 1 is encapsulated in the Ethernet layer by the encapsulation/decapsulation module 302, the destination MAC address of the Ethernet frame is 00-15-EB-7F-EF-FF. Source The MAC address is 00-15-EB-7F-E0-02, and the outer VLAN is 4001 (can be the same as the outer VLAN 4001 above, or different, depending on whether the outer VLAN on the OLT is sufficient), the inner VLAN It is 1002. The original CPRI model is packaged into the payload portion of the Ethernet frame. After the encapsulation is completed, the Frame Check Sequence (FCS) check is performed again, and the result is filled in the last 4 bytes.

After the Ethernet encapsulation is performed by the encapsulation/decapsulation module 302, the ordinary Ethernet data carrying the CPRI data is sent to the OLT control switch board according to the normal Ethernet switching principle after being sent to the 303 module.

After receiving the Ethernet frame that is forwarded by the N user-side interface unit of the OLT (such as RRU1-RRUn in FIG. 9) and encapsulated by the service forwarding module 303, the OLT control switch board follows the normal Ethernet data processing mode. Perform service forwarding, aggregation, and QoS processing.

An Ethernet channel is established between the OLT and the BBU device through the optical fiber. FIG. 11 is a schematic diagram of a logical structure of a BBU device that supports receiving aggregated multiple RRU signals from an OLT according to an embodiment of the present invention. The "encapsulation/decapsulation module 402" in the BBU is unique to the embodiments of the present invention. Within the high speed interface unit of the BBU device, the new encapsulation/decapsulation module 402 is unique to the embodiments of the present invention. The encapsulation/decapsulation module 402 performs decapsulation processing on the Ethernet data received from the OLT, and restores the CPRI data to the high-speed interface unit 401, and processes according to the original normal process. Thereby, the service transmission of the BBU and the RRU is completed. The encapsulation/decapsulation module 402 creates a forwarding table according to the VLAN information and the MAC address information when decapsulating the Ethernet data. The forwarding table is used to encapsulate the CPRI signal in the downlink direction as shown in FIG. 12 . At the same time, between the OLT and the BBU, the link aggregation control protocol (LACP) protection group can be used to implement redundancy protection. This can effectively enhance the service stability between the OLT and the BBU.

In the downlink direction (data is sent from the BBU to the OLT), the high-speed interface unit 401 of the BBU device receives the CPRI data forwarded by the base station interface unit through the service channel, and then performs the Ethernet layer encapsulation through the 402 module. Encapsulate the corresponding Ethernet SVLAN (outer VLAN), Ethernet CVLAN (inner VLAN), and encapsulate the "Ethernet source MAC address" in the table as the downstream direction according to the CPRI signal number shown in the table shown in FIG. The Ethernet destination MAC address, the Ethernet destination MAC address in the table is encapsulated into the Ethernet source MAC address in the downstream direction, and the FCS check is performed again, and the result is filled in the last 4 bytes. It is then sent to the OLT 403.

It can be seen from the above two embodiments that the technical solutions provided by the embodiments of the present invention have the beneficial effects compared with the technical solutions of the related art:

1. Using the currently widely deployed ODN fiber to connect different RRUs, multiple RRUs are aggregated to the OLT and share the fiber connection between the OLT and the BBU, saving infrastructure costs;

2. After multiple RRUs are aggregated to the OLT, the OLT can optionally implement differentiated service quality control for different users through bandwidth control and QoS functions.

3. An active/standby link can be created between the OLT and the BBU to improve service reliability between the BBU and the RRU.

4. The interface between the RRU and the BBU does not need to be adapted. The RRU only needs to adapt to the interface with the OLT.

Finally, it should be noted that the device embodiments described above are merely illustrative. For example, the division of modules is only a logical function division, and the actual implementation may have another division manner. Alternatively, the modules shown or discussed may be connected to each other through some interface, and may be in electrical, mechanical or other form. Each of the modules may or may not be physically separate, and may or may not be a physical unit. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the embodiment.

In addition, the functional modules in the embodiments of the present invention may be integrated into one processing module, or each module may be physically included, or two or more modules may be integrated into one module. The above integrated modules can be implemented in the form of hardware or in the form of hardware plus software function modules.

The above-described integrated modules implemented in the form of software functional units can be stored in a computer readable storage medium. The software functional modules described above are stored in a storage medium and include instructions for causing a computer device (which may be a personal computer, server, or network device, etc.) to perform some of the steps of the method of each embodiment of the present invention. The foregoing storage medium includes: a U disk, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disk, and the like, which can store program code. .

Industrial applicability

With the solution provided by the embodiment of the present invention, the network infrastructure cost can be reduced, the differentiated service quality control of different users can be implemented, the service reliability between the BBU and the RRU can be improved, and the bandwidth occupied by the RRU can be controlled and adjusted.

Claims

A data transmission method, the optical line terminal OLT is connected between the baseband processing unit BBU and the N radio remote units RRU, where N is a natural number, and the method includes:

Receiving, by the OLT, general public radio interface CPRI data of the N RRUs transmitted by the N RRUs;

The OLT encapsulates the received CPRI data of the N RRUs according to a preset encapsulation technology;

The OLT performs aggregation processing on the encapsulated CPRI data of the N RRUs and forwards the data to the BBU.
The method according to claim 1, wherein after the OLT forwards the encapsulated CPRI data of the N RRUs to the BBU, the method further includes:

Obtaining, by the BBU, the CPRI data of the encapsulated N RRUs after parsing the aggregated data sent by the OLT, and respectively performing the obtained according to the decapsulation technology corresponding to the preset encapsulation technology The encapsulated CPRI data of the N RRUs are decapsulated to obtain CPRI data of the N RRUs.
The method of claim 1, wherein before the OLT receives the common public radio interface CPRI data of the N RRUs of the N RRU transmissions, the method further comprises:

The working mode parameter is determined after the OLT is connected to the RRU; the working mode parameter includes: an operating wavelength, a transceiver mode, and a transmission rate.
The method according to claim 3, wherein determining the working mode parameters after the OLT is connected to the RRU comprises:

Determining, by the OLT, the operating mode parameter after receiving a command for indicating the working mode parameter; or

The working mode parameter is determined after the OLT negotiates and adapts with the RRU.
The method according to any one of claims 1 to 4, wherein the predetermined packaging technology include:

Ethernet VLAN stacking, multi-protocol label switching MPLS encapsulation, circuit emulation service CES encapsulation.
A data transmission method, the optical line terminal OLT is connected between the baseband processing unit BBU and the N radio remote units RRU, where N is a natural number, and the method includes:

Receiving, by the OLT, the data encapsulated by the BBU to the common public radio interface CPRI data of the N RRUs according to a preset encapsulation technology;

After receiving the encapsulated data, the OLT decapsulates the encapsulated data according to a decapsulation technology corresponding to the preset encapsulation technology, and obtains CPRI data sent by the BBU to the N RRUs. ;

The OLT forwards the CPRI data sent by the BBU to the N RRUs to the N RRUs.
The method according to claim 6, wherein after the OLT receives the data encapsulated by the BBU to the general public radio interface CPRI data of the N RRUs according to a preset encapsulation technique, the method The method also includes:

The working mode parameter is determined after the OLT is connected to the RRU; the working mode parameter includes: an operating wavelength, a transceiver mode, and a transmission rate.
The method according to claim 7, wherein determining the working mode parameters after the OLT is connected to the RRU comprises:

Determining, by the OLT, the operating mode parameter after receiving a command for indicating the working mode parameter; or

The working mode parameter is determined after the OLT negotiates and adapts with the RRU.
The method according to any one of claims 6 to 8, wherein the preset packaging technology comprises:

Ethernet VLAN stacking, multi-protocol label switching MPLS encapsulation, circuit emulation service CES encapsulation.
An optical line terminal OLT includes:

N user side interface units connected to the N remote radio unit RRUs, where N is a natural number, an uplink interface unit connected to the baseband processing unit BBU, and a convergence forwarding unit;

The user side interface unit includes: a first encapsulation module and a first decapsulation module;

The first encapsulating module is configured to: respectively encapsulate the received CPRI data of the RRU according to a preset encapsulation technology;

The first decapsulation module is configured to: after decapsulating the received encapsulated BBUs to the CPRU data of the RRU according to the decapsulation technology corresponding to the preset encapsulation technology, Determining CPRI data sent by the BBU to the RRU;

The aggregation forwarding unit includes: a convergence module and a forwarding module;

The aggregation module is configured to: after the encapsulated CPRI data of the N RRUs are aggregated, and then forwarded to the BBU through the uplink interface unit;

The forwarding module is configured to: forward the received encapsulated BBUs to the Nth RRUs and forward the CPRI data to the N user-side interface units.
The OLT of claim 10, wherein the user side interface unit further comprises:

The interface matching module is configured to: determine a working mode parameter after being connected to the RRU; and the working mode parameter includes: an operating wavelength, a transceiver mode, and a transmission rate.
The OLT of claim 11 wherein said interface matching module is configured to:

Determining the working mode parameter after receiving a command for indicating the working mode parameter; or

The working mode parameter is determined after being negotiated and adapted with the RRU.
The OLT according to any one of claims 10 to 12, wherein the preset packaging technology comprises:

Ethernet VLAN stacking, multi-protocol label switching MPLS encapsulation, circuit emulation service CES encapsulation.
A base station processing unit BBU includes: a second encapsulation module and a second decapsulation module;

The second encapsulating module is configured to: encapsulate the common public radio interface CPRI data sent by the BBU to the N radio remote units RRU according to a preset encapsulation technology, and then send the data to the optical line terminal OLT, where N is a natural number;

The second decapsulation module is configured to: after parsing the aggregated data sent by the OLT, obtain the CPRI data of the encapsulated N RRUs, and according to a solution corresponding to the preset encapsulation technology The encapsulation technology obtains the CPRI data of the N RRUs after decapsulating the obtained CPRI data of the encapsulated N RRUs.
A computer readable storage medium storing computer executable instructions for performing the method of any of claims 1-9.