CN106302166A - A kind of data transmission method and device - Google Patents

Abstract

The invention discloses a data transmission method and device, comprising: when N RRUs transmit data uplink to a BBU, the OLT encapsulates the CPRI data of the N RRUs after receiving them; the OLT encapsulates the CPRI data of the N RRUs After aggregation processing, it is forwarded to the BBU; the BBU obtains the encapsulated CPRI data of N RRUs after analyzing the data aggregated by the OLT, and respectively decapsulates the obtained data to obtain the CPRI data of N RRUs. When the BBU transmits data downlink to N RRUs, the OLT decapsulates the encapsulated data after receiving the CPRI data encapsulated by the BBU and sent to the N RRUs, and the OLT sends the decapsulated BBU to the CPRI of the N RRUs The data is forwarded to N RRUs respectively.

Description

A data transmission method and device

technical field

The invention relates to optical communication technology, in particular to a data transmission method and device.

Background technique

Most of the third-generation communication or fourth-generation communication (3G/4G) networks use a distributed base station architecture, and an optical fiber connection is used between the Radio Remote Unit (RRU) and the Baseband Unit (BBU). A BBU is connected to multiple RRUs through multiple ports. The BBU is generally installed in the central computer room, and the RRU is generally installed in each division unit or different floors of a large venue. The BBU and the RRU are connected through a common public radio interface (Common Public Radio Interface, CPRI). Its typical topology network diagram is shown in Figure 1.

Optical fiber transmission is used between the BBU and RRU, and the RRU is connected to the antenna through a coaxial cable and a power divider. That is, the backbone uses optical fiber, and the branches use coaxial cables. Uplink direction (user signal transmission direction): The signal of the user equipment is received by the nearest RRU channel, and then transmitted from this channel to the base station through the optical fiber. Downlink direction (user signal receiving direction): The optical fiber is directly connected from the BBU to the RRU, and the baseband digital signal is transmitted between the BBU and the RRU, so that the base station can control a user's signal to be transmitted from the designated RRU channel, thereby reducing the impact on other users. Interference from users on the channel.

At present, the existing networking methods have the following disadvantages: BBU and RRU are directly connected through optical fibers, which is limited by the interface of the BBU. When the number of RRUs is large, more RRUs are required. Therefore, the cost of networking infrastructure is relatively high. , In addition, because the BBU and RRU are directly connected through optical fibers, the bandwidth occupied by the RRU is relatively fixed, and bandwidth control is not supported.

Contents of the invention

In order to solve the above technical problems, the present invention provides a data transmission method and device, which can reduce the cost of networking infrastructure and can control and adjust the bandwidth occupied by the RRU.

In order to achieve the purpose of the present invention, the present invention provides a data transmission method, the optical line terminal OLT is connected between the baseband processing unit BBU and N radio remote units RRU, N is a natural number, and the method includes:

The OLT receives the common public radio interface CPRI data of the N RRUs transmitted by the N RRUs;

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

The OLT aggregates the encapsulated CPRI data of the N RRUs and forwards them to the BBU.

Further, after the method includes:

The BBU obtains the encapsulated CPRI data of the N RRUs after parsing the aggregated data sent by the OLT, and separately decapsulates the acquired data according to the decapsulation technology corresponding to the preset encapsulation technology The encapsulated CPRI data of the N RRUs is decapsulated to obtain the CPRI data of the N RRUs.

Further, before the method also includes:

After the OLT is connected to the RRU, the working mode parameters are determined; the working mode parameters include: working wavelength, transceiver mode and transmission rate.

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

The OLT determines the working mode parameter after receiving the command indicating the working mode parameter; or

The OLT and the RRU determine the working mode parameters after negotiation and adaptation.

Further, the preset packaging technology includes:

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

The present invention also provides another data transmission method. The optical line terminal OLT is connected between the baseband processing unit BBU and N remote radio frequency units RRU, and N is a natural number. The method includes:

The OLT receives the data after the BBU sends the general public radio interface CPRI data encapsulation of the BBU to the N RRUs according to a preset encapsulation technology;

After receiving the encapsulated data, the OLT decapsulates the encapsulated data according to the decapsulation technology corresponding to the preset encapsulation technology to obtain the 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 respectively.

Further, before the method also includes:

After the OLT is connected to the RRU, the working mode parameters are determined; the working mode parameters include: working wavelength, transceiver mode and transmission rate.

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

The OLT determines the working mode parameter after receiving the command indicating the working mode parameter; or

The OLT and the RRU determine the working mode parameters after negotiation and adaptation.

Further, the preset packaging technology includes:

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

The present invention provides an optical line terminal OLT, comprising:

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

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

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

The decapsulation module is configured to decapsulate the received CPRI data sent to the RRU by the encapsulated BBU according to the decapsulation technique corresponding to the preset encapsulation technique, and obtain the BBU transmission data after decapsulation. CPRI data to the RRU;

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

The aggregation module is configured to aggregate the encapsulated CPRI data of the N RRUs and forward them to the BBU through the uplink interface unit;

The forwarding module is configured to forward the received encapsulated CPRI data sent from the BBU to the N RRUs to the N user-side interface units respectively.

Further, the user-side interface unit also includes:

The interface matching module is used to determine the working mode parameters after being connected with the RRU; the working mode parameters include: working wavelength, transceiver mode and transmission rate.

Further, the interface matching module is specifically used for:

determining the operating mode parameter after receiving a command indicating the operating mode parameter; or

The working mode parameter is determined after negotiation and adaptation with the RRU.

Further, the preset packaging technology includes:

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

The present invention provides a base station processing unit BBU, including: an encapsulation module and a decapsulation module;

The encapsulation module is used for encapsulating the common public radio interface CPRI data sent by the BBU to N remote radio frequency units RRU according to the preset encapsulation technology, and then encapsulating them and sending them to the optical line terminal OLT, where N is a natural number;

The decapsulation module is configured to analyze the aggregated and processed data sent by the OLT to obtain the encapsulated CPRI data of the N RRUs, and respectively according to the decapsulation technology corresponding to the preset encapsulation technology After decapsulating the obtained encapsulated CPRI data of the N RRUs, the CPRI data of the N RRUs is acquired.

Further, the preset packaging technology includes:

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

The present invention provides a data transmission method and device. An optical line terminal OLT is connected between a baseband processing unit BBU and N radio remote units RRU, where N is a natural number; when N RRUs transmit data to the BBU uplink, the The OLT receives the 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 The encapsulated CPRI data of the N RRUs is aggregated and forwarded to the BBU; the BBU analyzes the aggregated data sent by the OLT and obtains the encapsulated CPRI data of the N RRUs , and obtain the CPRI data of the N RRUs after decapsulating the obtained encapsulated CPRI data of the N RRUs respectively according to the decapsulation technology corresponding to the preset encapsulation technology. When the BBU downlink transmits data to N RRUs, the OLT receives the data after the BBU sends the BBU to the general public radio interface CPRI data encapsulation of the N RRUs according to the preset encapsulation technology; the OLT receives After receiving the encapsulated data, decapsulate the encapsulated data according to the decapsulation technology corresponding to the preset encapsulation technology to obtain the 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 respectively. Through the solution provided by the present invention, the cost of network infrastructure construction can be reduced, and the bandwidth occupied by the RRU can be controlled and adjusted.

Additional features and advantages of the invention will be set forth in the description which follows, and in part will be apparent from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention may be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.

Description of drawings

The accompanying drawings are used to provide a further understanding of the technical solution of the present invention, and constitute a part of the description, and are used together with the embodiments of the application to explain the technical solution of the present invention, and do not constitute a limitation to the technical solution of the present invention.

Figure 1 is the existing BBU and RRU topology networking diagram;

Fig. 2 is the topological networking diagram of existing OLT and ONU;

FIG. 3 is a schematic diagram of a logical structure of an existing OLT;

Fig. 4 is the topology networking diagram of BBU, RRU and OLT provided by the embodiment of the present invention;

FIG. 5 is a schematic flowchart of a data transmission method provided by an embodiment of the present invention;

FIG. 6 is a schematic flowchart of another data transmission method provided by an embodiment of the present invention;

FIG. 7 is a schematic diagram of a logical structure of an OLT provided by an embodiment of the present invention;

FIG. 8 is a schematic diagram of a logical structure of a BBU provided by an embodiment of the present invention;

FIG. 9 is a schematic diagram of a logical structure of an OLT supporting reception of aggregated multi-channel RRU signals in Embodiment 2 provided by an embodiment of the present invention;

FIG. 10 is a package structure diagram of package CPRI data in Example 2 provided by the embodiment of the present invention;

FIG. 11 is a schematic diagram of a logical structure of a BBU that supports receiving aggregated multi-channel RRU signals from an OLT in Embodiment 2 provided by an embodiment of the present invention;

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

detailed description

In order to make the purpose, technical solution and advantages of the present invention more clear, the embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings. It should be noted that, in the case of no conflict, the embodiments in the present application and the features in the embodiments can be combined arbitrarily with each other.

The steps shown in the flowcharts of the figures may be performed in a computer system, such as a set of computer-executable instructions. Also, although a logical order is shown in the flowcharts, in some cases the steps shown or described may be performed in an order different from that shown or described herein.

The basic idea of the embodiments of the present invention is to introduce an optical line terminal (Optical Line Terminal, OLT) device as an intermediate transmission node between the BBU and the RRU. OLT equipment is currently the most important central office equipment in the application of Passive Optical Network (PON) technology. Its functions are: 1. Provide multiple PON ports through Optical Distribution Network (Optical Distribution Network, ODN) optical fiber and The terminal equipment is connected to an Optical Network Unit (ONU), and the connection topology can be point-to-point or point-to-multipoint. In terms of implementation technology, it can be a time-division multiplexing method in which multiple ONUs share a certain wavelength, or a wavelength-division multiplexing method in which multiple ONUs monopolize different wavelengths, or a combination of the above two multiplexing methods, that is, multiple ONUs share a certain wavelength. wavelength, while other multiple ONUs respectively monopolize multiple wavelengths; 2. Realize the control, management and maintenance functions of the terminal equipment ONU. 3. Realize converged access to multiple terminal services. As shown in FIG. 2 , it is a topological networking diagram of the OLT and ONU mentioned in the present invention.

The OLT equipment mentioned in the present invention, its structure as shown in Figure 3, user side port can be Ethernet passive optical network (Ethernet PON, EPON), gigabit passive optical network (Gigabit-CapablePON, GPON), ten Gigabit Ethernet Passive Optical Network (10Gigabit-Capable EPON, 10G-EPON), Ten Gigabit Passive Optical Network (10Gigabit-Capable PON, 10G-GPON), Next Generation Passive Optical Network (Next-Generation PON, NG -PON) and other access modes, the access mode of a certain port can be manually switched through the configuration command on the OLT, or can be automatically switched after negotiation and adaptation with the interface of the peer connected device.

On the basis of the traditional BBU-RRU networking architecture, the present invention uses the access layer OLT equipment of the current large-scale application to converge RRUs, and multiple user-side interfaces of the OLT are respectively connected to multiple RRUs, and the received multi-channel RRU signals Perform access, encapsulation, and convergence, and connect to the BBU through the uplink optical interface of the OLT device. Change the point-to-point connection between the traditional BBU and the RRU into a point-to-multipoint connection. As shown in FIG. 4 , it is a topology networking diagram proposed by the present invention.

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

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

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

Step 103, the OLT aggregates the encapsulated CPRI data of the N RRUs and forwards them to the BBU.

Further, after step 103, the method may also include:

Step 104: The BBU analyzes the aggregated processed data sent by the OLT and obtains the encapsulated CPRI data of the N RRUs, and respectively decapsulates the acquired data according to the decapsulation technology corresponding to the preset encapsulation technology After decapsulating the encapsulated CPRI data of the N RRUs, the CPRI data of the N RRUs is obtained.

Further, before step 101, the method may also include:

Step 100, after the OLT is connected to the RRU, determine working mode parameters; the working mode parameters include: working wavelength, transceiver mode and transmission rate.

Further, step 100 may specifically include:

The OLT determines the working mode parameter after receiving the command indicating the working mode parameter; or

The OLT and the RRU determine the working mode parameters after negotiation and adaptation.

Further, the preset packaging technology includes:

Ethernet VLAN stacking (VLAN STACKING) encapsulation, multi-protocol label switching (Multi-Protocol Label Switching, MPLS) encapsulation, circuit emulation service (CircuitEmulation Service, CES) encapsulation.

According to a data transmission method provided by an embodiment of the present invention, the OLT receives the CPRI data of the N RRUs transmitted by the N RRUs; Encapsulate the CPRI data of the N RRUs; the OLT aggregates the encapsulated CPRI data of the N RRUs and forwards them to the BBU. In the technical solution provided by the present invention, the OLT as an intermediate node can enable the BBU to connect to more RRUs, reduce the cost of networking infrastructure, and control and adjust the bandwidth occupied by the RRUs through the OLT.

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

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

Step 202: After receiving the encapsulated data, the OLT decapsulates the encapsulated data according to the decapsulation technique corresponding to the preset encapsulation technique, and then obtains the BBU and sends it 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 respectively.

Further, before step 201, the method may further include:

Step 200, after the OLT is connected to the RRU, determine working mode parameters; the working mode parameters include: working wavelength, transceiver mode and transmission rate.

Further, step 200 may specifically include:

The OLT determines the working mode parameter after receiving the command indicating the working mode parameter; or

The OLT and the RRU determine the working mode parameters after negotiation and adaptation.

Further, the preset packaging technology includes:

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

Further, before the method also includes:

According to another data transmission method provided by the embodiment of the present invention, the OLT receives the data after the BBU sends the CPRI data encapsulated by the BBU to the N RRUs according to the 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 CPRI data sent by the BBU to the N RRUs is obtained by decapsulating the encapsulated data; The CPRI data sent by the BBU to the N RRUs are respectively forwarded to the N RRUs. In the technical solution provided by the present invention, the OLT as an intermediate node can enable the BBU to connect to more RRUs, reduce the cost of networking infrastructure, and control and adjust the bandwidth occupied by the RRUs through the OLT.

An OLT provided by an embodiment of the present invention, as shown in FIG. 7, the OLT includes:

N user-side interface units connected to N RRUs, where N is a natural number, an uplink interface unit connected to the BBU, and an aggregation and forwarding unit;

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

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

The decapsulation module is configured to decapsulate the received CPRI data sent to the RRU by the encapsulated BBU according to the decapsulation technique corresponding to the preset encapsulation technique, and obtain the BBU transmission data after decapsulation. CPRI data to the RRU;

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

The aggregation module is configured to aggregate the encapsulated CPRI data of the N RRUs and forward them to the BBU through the uplink interface unit;

The forwarding module is configured to forward the received encapsulated CPRI data sent from the BBU to the N RRUs to the N user-side interface units respectively.

Further, as shown in FIG. 7, the user-side interface unit further includes:

The interface matching module is used to determine working mode parameters after being connected with the RRU; the working mode parameters include: working wavelength, transceiver mode and transmission rate.

Further, the interface matching module is specifically used for:

determining the operating mode parameter after receiving a command indicating the operating mode parameter; or

The working mode parameter is determined after negotiation and adaptation with the RRU.

Further, the preset packaging technology includes:

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

This embodiment is used to implement the above-mentioned method embodiments. For the workflow and working principle of each unit in this embodiment, refer to the descriptions in the above-mentioned method embodiments, and details are not repeated here.

The OLT provided by the embodiment of the present invention is connected to the BBU through an uplink interface unit, and connected to N RRUs through N user-side interface units. The module encapsulates the received CPRI data of the RRUs according to the preset encapsulation technology; The connection interface unit forwards to the BBU; when the BBU transmits data downlink to N RRUs, the forwarding module in the convergence and forwarding unit sends the received encapsulated BBU to the CPRI data of the N RRUs Then forward them to the N user-side interface units respectively, and the decapsulation module in the user-side interface unit respectively transmits the received encapsulated BBU according to the decapsulation technology corresponding to the preset encapsulation technology After the CPRI data sent to the RRU is decapsulated, the CPRI data sent by the BBU to the RRU is obtained. In the technical solution provided by the present invention, the OLT as an intermediate node can enable the BBU to connect to more RRUs, reduce the cost of networking infrastructure, and control and adjust the bandwidth occupied by the RRUs through the OLT.

An embodiment of the present invention provides a BBU. As shown in FIG. 8, the BBU includes: an encapsulation module and a decapsulation module;

The encapsulation module is configured to encapsulate the CPRI data sent by the BBU to N RRUs according to a preset encapsulation technology and send them to the OLT after encapsulation, where N is a natural number;

The decapsulation module is configured to analyze the aggregated and processed data sent by the OLT to obtain the encapsulated CPRI data of the N RRUs, and respectively according to the decapsulation technology corresponding to the preset encapsulation technology After decapsulating the obtained encapsulated CPRI data of the N RRUs, the CPRI data of the N RRUs is acquired.

Further, the preset packaging technology includes:

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

This embodiment is used to implement the above-mentioned method embodiments. For the workflow and working principle of each unit in this embodiment, refer to the descriptions in the above-mentioned method embodiments, and details are not repeated here.

The BBU provided by the embodiment of the present invention is connected to the OLT through the uplink interface unit of the OLT, wherein when the BBU transmits data downlink to N RRUs, the encapsulation module of the BBU sends the BBU to the N RRUs according to the preset encapsulation technology The CPRI data of the RRUs are respectively encapsulated and then sent to the OLT. When the RRU uplink transmits data to the BBU, the decapsulation module of the BBU analyzes the aggregated data sent by the OLT to obtain the encapsulated CPRI data of the N RRUs, and encapsulates them according to the preset The decapsulation technology corresponding to the technology decapsulates the acquired CPRI data of the N RRUs after decapsulation respectively, and obtains the CPRI data of the N RRUs. In the technical solution provided by the present invention, the OLT as an intermediate node can enable the BBU to connect to more RRUs, reduce the cost of networking infrastructure, and control and adjust the bandwidth occupied by the RRUs through the OLT.

In order to enable those skilled in the art to understand the technical solution provided by the present invention more clearly, the technical solution provided by the present invention will be described in detail below through specific examples:

Embodiment one

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

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

The working mode of the user-side interface unit of the OLT is manually switched through configuration commands, or automatically switched after negotiation and adaptation with the interface of the peer device. This working mode needs to determine at least the following 3 parameters:

1) Working wavelength. On the OLT, the user-side interface unit is designated to work in a certain group of wavelengths through command switching; or the user-side interface unit periodically switches its own transmit and receive wavelengths, and at the same time monitors the receive and transmit wavelengths of the peer RRU device, and then switches its own transmit and receive wavelengths. The receiving wavelength is paired with the peer RRU device to complete wavelength adaptation.

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

3) Transmission rate. The user-side interface unit of the OLT supports 8 typical CPRI rates, and performs manual or automatic switching according to the serial digital rate sent by the RRU.

In the upstream direction, the user-side interface unit of the OLT encapsulates the received CPRI data, and there are many optional encapsulation technologies, such as VLAN STACKING encapsulation, MPLS encapsulation, CES encapsulation, etc. The encapsulated CPRI data is forwarded to the OLT uplink interface unit through the convergence and forwarding unit of the OLT. In the downstream direction, the user-side interface interface unit of the OLT checks that the outer VLAN and inner VLAN IDs of the received VLANSTACKING data are consistent with the outer VLAN and inner VLAN IDs added during encapsulation in the upstream direction, and it is considered legal Data packet, after VLAN STACKING decapsulation of the data packet, the CPRI data is restored and sent to the RRU device connected to it.

In the upstream direction, the BBU device connected to the OLT decapsulates the VLANSTACKING encapsulated Ethernet data packet received from the OLT, and maps to different original RRU device branches according to the outer and inner VLAN IDs in the encapsulation format. Hand over to the high-speed interface unit for CPRI protocol analysis and data processing. In the downlink direction, before the high-speed interface unit of the BBU sends data services to different destination RRU devices, the BBU then encapsulates the data services into Ethernet data packets with different outer VLAN and inner VLAN IDs according to the RRU branch numbers. After receiving, it is forwarded to the user-side interface units of different OLTs through the convergence and forwarding unit.

Embodiment two:

FIG. 9 is a schematic diagram of a logical structure of an OLT supporting reception of aggregated multi-channel RRU signals provided by an embodiment of the present invention. As shown in Figure 9, the user-side interface unit of the OLT performs adaptation, encapsulation, aggregation, and forwarding after receiving the CPRI data of the RRU as follows:

The 301 module performs interface adaptation with the RRU device. For example, the RRU interface type is option1, and the rate is CPRI line bit rate option 1:614.4Mbit/s, 8B/10B line coding(1x 491.52x 10/8Mbit/s). The user-side interface unit of the OLT specifies the user-side interface unit to work in a certain group of wavelengths through command line switching; or the user-side interface unit periodically switches its own sending and receiving wavelengths, and at the same time monitors the receiving and sending wavelengths of the peer RRU device. Then switch its own sending and receiving wavelengths to pair with the peer RRU device to complete wavelength adaptation.

After the 301 module determines the working wavelength, it adjusts the wavelength to point-to-point working mode, so that the user-side interface unit and the peer RRU device adopt a point-to-point transmission model and exclusively occupy the link channel of this wavelength. According to the CPRI data transmission rate of the peer RRU device, the 301 module adjusts the port sending and receiving rate to 614.4BMbit/s, and completes the physical layer and link layer connection with the RRU device.

After module 302 receives the CPRI data sent by module 301, it performs Ethernet VLAN stack encapsulation, as shown in Figure 10. Among them, the Ethernet source Media Access Control (MAC) address and the destination MAC address can borrow the traditional PW pseudowire MAC address segment, such as the destination MAC address is specified as 00-15-EB-7F-EF-FF, and the source MAC address On the basis of 00-15-EB-7F-E0-01, map according to the physical slot number and port number of the OLT user-side interface on the OLT. In the use of virtual local area network (Virtual Local Area Network, VLAN), select a VLAN ID that is not planned to be used by the current OLT for the outer VLAN, such as 4001-4016. Inner VLAN is optional to use or not to use. If the inner VLAN is not used, the OLT uses the outer VLAN to uniquely identify the service flow (data flow between the BBU and one RRU), and perform operations such as 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 the inner VLAN. The inner VLAN can be mapped on the basis of a certain VLAN ID according to the physical slot number and port number of the OLT user-side interface on the OLT. In this way, the multiple RRU devices connected to the OLT can be uniquely identified through the outer VLAN and the inner VLAN.

For example, for the RRU device connected to port 1 in slot 1 of the OLT, after the 302 module performs Ethernet layer encapsulation, the destination MAC address of the Ethernet frame is 00-15-EB-7F-EF-FF, and 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 type is encapsulated into the payload part of the Ethernet frame. After the encapsulation is complete, perform the FCS check again, and fill the result into the last 4 bytes.

For example, the RRU device connected to port 2 in slot 1 of the OLT, after the Ethernet layer encapsulation by the 302 module, the destination MAC address of the Ethernet frame is 00-15-EB-7F-EF-FF, and the source MAC address is 00-15-EB-7F-E0-02, the outer VLAN is 4001 (it can be the same as the outer VLAN 4001 above, or it can be different, depending on whether the outer VLAN is sufficient on the OLT), and the inner VLAN is 1002. The original CPRI type is encapsulated into the payload part 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.

The business after Ethernet encapsulation by the 302 module is ordinary Ethernet data carrying CPRI data. After being sent to the 303 module, it is forwarded to the OLT control switching board according to the ordinary Ethernet switching principle.

After the OLT control switch board receives the Ethernet frame forwarded from the N user-side interface units of the OLT (RRU1-RRUn in Figure 9) and encapsulated by the 303 module, it performs business according to the normal Ethernet data processing method Forwarding, aggregation, QoS processing, etc.

An Ethernet channel is established between the OLT and the BBU through optical fibers. FIG. 11 is a schematic diagram of a logical structure of a BBU device that supports receiving aggregated multi-channel RRU signals from an OLT provided by an embodiment of the present invention. Wherein, the "encapsulation/decapsulation module" in the BBU is specific to this embodiment of the present invention. In the high-speed interface unit of the BBU device, the newly added encapsulation/decapsulation module (402) is unique to the embodiment of the present invention. Among them, the 402 module decapsulates the Ethernet data received from the OLT, restores the CPRI data and sends it to the high-speed interface unit 401, and processes according to the original normal process. Thus, the service transmission between the BBU and the RRU is completed. When the 402 module decapsulates Ethernet data, it creates a forwarding table according to VLAN information and MAC address information. The forwarding table is shown in Figure 12 and is used to encapsulate CPRI signals in the downlink direction. At the same time, between the OLT and the BBU device, you can choose to use multiple fibers to create a LACP (Link Aggregation Control Protocol, Link Aggregation Control Protocol) protection group for redundancy protection, which can effectively enhance the business stability between the OLT and the BBU device.

In the downlink direction (data is sent from the BBU to the OLT direction), the high-speed interface unit (401) of the BBU equipment receives the CPRI data forwarded by the base station interface unit through the service channel, and performs Ethernet layer encapsulation through the 402 module. According to the CPRI signal number shown in the table shown in Figure 12, 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 The Ethernet destination MAC address, encapsulate the "Ethernet destination MAC address" in the table as the Ethernet source MAC address in the downlink direction, perform FCS check again, and fill the result into the last 4 bytes. Then send to the 403 module.

It can be seen from the above two embodiments that the beneficial effects of the technical solution provided by the embodiment of the present invention compared with the existing technical solution are:

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

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

3. Active and standby protection links can be optionally created between OLT and BBU to improve service reliability between BBU and RRU;

4. There is no need for interface adaptation between the RRU and the BBU, and the RRU only needs to adapt the interface with the OLT.

Finally, it should be noted that the device embodiments described above are only illustrative. For example, the division of modules is only a logical function division, and there may be other division methods in actual implementation. In another point, the modules shown or discussed may be connected to each other through some interfaces, which may be in electrical, mechanical or other forms. The modules may or may not be physically separated, and may or may not be physical units. Part or all of the modules can be selected according to actual needs to achieve the purpose of the solution of this embodiment.

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

The above-mentioned integrated modules implemented in the form of software functional units can be stored in a computer-readable storage medium. The above-mentioned software function modules are stored in a storage medium, and include several instructions to enable a computer device (which may be a personal computer, server, or network device, etc.) to execute some steps of the methods described in various embodiments of the present invention. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (Read-Only Memory, ROM), random access memory (Random Access Memory, RAM), magnetic disk or optical disk, and various media capable of storing program codes.

The above is only a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Anyone skilled in the art can easily think of changes or substitutions within the technical scope disclosed in the present invention. Should be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention should be determined by the protection scope of the claims.

Claims (15)

1. a data transmission method, it is characterised in that optical line terminal OLT is connected to Base-Band Processing Between unit B BU and N number of radio frequency remote unit RRU, N is natural number, and described method includes:

Described OLT receives the common public radio of described N number of RRU of described N number of RRU transmission Interface CPRI data；

Described OLT is according to presetting the encapsulation technology CPRI number respectively to the described N number of RRU received According to being packaged；

Described OLT forwards after the CPRI data of the described N number of RRU after encapsulation are carried out convergence processing To described BBU.

Method the most according to claim 1, it is characterised in that include after described method:

After obtaining described encapsulation after data after the convergence processing that the described BBU described OLT of parsing sends The CPRI data of described N number of RRU, and according to the decapsulation technology corresponding with described default encapsulation technology Institute is obtained after CPRI data to the described N number of RRU after the described encapsulation obtained decapsulate respectively State the CPRI data of N number of RRU.

Method the most according to claim 1, it is characterised in that also included before described method:

Described OLT determines mode of operation parameter with described RRU after being connected；Described mode of operation parameter bag Include: operation wavelength, transceiver mode and transfer rate.

Method the most according to claim 3, it is characterised in that described OLT and described RRU is even Determine after connecing that mode of operation parameter includes:

Described OLT receives and determines that described mode of operation is joined after indicating the order of described mode of operation parameter Number；Or

Described OLT and described RRU hold consultation and determine described mode of operation parameter after adaptation.

5. according to the method described in Claims 1-4 any one, it is characterised in that described default envelope Packing technique includes:

Ethernet vlan stacked package, multiprotocol label switching MPLS encapsulation, circuit emulation service CES encapsulates.

6. a data transmission method, it is characterised in that optical line terminal OLT is connected to Base-Band Processing Between unit B BU and N number of radio frequency remote unit RRU, N is natural number, and described method includes:

Described OLT receives described BBU and is sent to by described BBU described N number of according to default encapsulation technology Data after the common public radio interface CPRI data encapsulation of RRU；

Described OLT receives after the data after described encapsulation according to the solution corresponding with described default encapsulation technology Encapsulation technology obtains described BBU and is sent to described N number of after decapsulating the data after described encapsulation The CPRI data of RRU；

Described BBU is sent to the CPRI data of described N number of RRU and is transmitted to described respectively by described OLT N number of RRU.

Method the most according to claim 6, it is characterised in that also included before described method:

Described OLT determines mode of operation parameter with described RRU after being connected；Described mode of operation parameter bag Include: operation wavelength, transceiver mode and transfer rate.

Method the most according to claim 7, it is characterised in that described OLT and described RRU is even Determine after connecing that mode of operation parameter includes:

Described OLT receives and determines that described mode of operation is joined after indicating the order of described mode of operation parameter Number；Or

Described OLT and described RRU hold consultation and determine described mode of operation parameter after adaptation.

9. according to the method described in claim 6 to 8 any one, it is characterised in that described default envelope Packing technique includes:

Ethernet vlan stacked package, multiprotocol label switching MPLS encapsulation, circuit emulation service CES encapsulates.

10. an optical line terminal OLT, it is characterised in that including:

The N number of user side interface unit being connected with N number of radio frequency remote unit RRU, N be natural number, The first line of a couplet interface unit that is connected with baseband processing unit BBU, converge retransmission unit；

Described user side interface unit includes: package module and decapsulation module；

Described package module, for according to presetting the encapsulation technology CPRI respectively to the described RRU received Data are packaged；

Described decapsulation module, for according to the decapsulation technology corresponding with described default encapsulation technology respectively Obtain after decapsulating after described BBU after the encapsulation received is sent to the CPRI data of described RRU Take described BBU and be sent to the CPRI data of described RRU；

Described convergence retransmission unit includes: convergence module and forwarding module；

Described convergence module, for carrying out at convergence the CPRI data of the described N number of RRU after encapsulation It is transmitted to described BBU by described first line of a couplet interface unit after reason；

Described forwarding module, the described BBU after the encapsulation that will receive is sent to described N number of RRU CPRI data after be transmitted to described N number of user side interface unit respectively.

11. OLT according to claim 10, it is characterised in that described user side interface unit is also Including:

Interface Matching module, determines mode of operation parameter after being connected with described RRU；Described Working mould Formula parameter includes: operation wavelength, transceiver mode and transfer rate.

12. OLT according to claim 11, it is characterised in that described Interface Matching module is concrete For:

Receive and determine described mode of operation parameter after indicating the order of described mode of operation parameter；Or

Hold consultation with described RRU and determine described mode of operation parameter after adaptation.

13. according to the OLT described in claim 10 to 12 any one, it is characterised in that described pre- If encapsulation technology includes:

Ethernet vlan stacked package, multiprotocol label switching MPLS encapsulation, circuit emulation service CES encapsulates.

14. 1 kinds of base station processing unit BBU, it is characterised in that including: package module conciliates Encapsulation Moulds Block；

Described package module, for being sent to N number of remote radio list according to default encapsulation technology by described BBU The common public radio interface CPRI data of unit RRU are sent to optical line terminal after being packaged respectively OLT, N are natural number；

Described decapsulation module, obtains institute after the data after resolving the convergence processing that described OLT sends State the CPRI data of the described N number of RRU after encapsulation, and according to corresponding with described default encapsulation technology The CPRI data of the described N number of RRU after the described encapsulation obtained are unsealed by decapsulation technology respectively The CPRI data of described N number of RRU are obtained after dress.

15. BBU according to claim 14, it is characterised in that described default encapsulation technology includes:

Ethernet vlan stacked package, multiprotocol label switching MPLS encapsulation, circuit emulation service CES encapsulates.