CN106992838A - A kind of method and apparatus for transmitting common wireless interface signal - Google Patents

Abstract

The embodiment of the invention discloses a kind of method for sending public radio interface CPRI signal, including：Send equipment and obtain the CPRI signals, and obtain the antenna carrier AxC container configuration informations of the CPRI signals, the AxC containers configuration information includes the configured information of effective AxC containers；According to the AxC containers configuration information by effective AxC container mappings in the CPRI signals into virtual basic frame；The virtual basic frame is mapped in Optical Channel Data Unit-k ODU, the ODU is mapped in Optical Channel Transport Unit-k OTU, the OTU is sent in transmission line.Effective AxC container mappings in CPRI signals into virtual basic frame, are improved the utilization rate of OTN transmission bandwidths by transmission equipment.

Description

A method and device for transmitting public wireless interface signals

technical field

The present invention relates to the communication field, in particular to a method and equipment for transmitting public wireless interface signals.

Background technique

In order to realize low-cost and rapid establishment of wireless networks in the case of machine room-less or unsatisfactory locations, a distributed base station solution is proposed. This solution adopts remote radio technology to separate a remote radio unit (Radio Remote Unit, RRU) from a baseband control unit (Building Base band Unit, BBU), and the two are connected through an optical fiber or a cable. Digitally sampled and quantized In-phase/Quadrature (I/Q) data is transmitted between the BBU and the RRU through a Common Public Radio Interface (CPRI).

The current CPRI signal has defined a series of rates, including CPRI options 1 to 8 (eight rates from 614.4Mbit/s to 10137.6Mbit/s), and the rate definitions of 25Gbps and 100Gbps are already in the pipeline. How to realize the transmission of CPRI signals at low cost has become a current research hotspot, wherein carrying CPRI signals through an optical transport network (Optical Transport Network, OTN) is one of the main solutions.

Currently, OTN is the core technology of the transport network, including the technical specifications of the electrical layer and the optical layer. It has rich OAM (Operation Administration and Maintenance, operation, management and maintenance), powerful TCM (Tandem Connection The external FEC (Forward Error Correction) capability can realize flexible scheduling and management of large-capacity services. As shown in Figure 1, the OTN frame is a modular structure of 4080 columns × 4 rows. Wherein, the frame alignment byte FAS (Frame Alignment Signal, frame alignment signal) provides the function of frame synchronization alignment. OTUk (Optical Channel Transport Unit k, Optical Channel Transport Unit k) OH is the overhead byte of the Optical Channel Transport Unit, and provides network management functions at the Optical Channel Transport Unit level. ODUk (OpticalChannel Data Unit k, optical channel data unit k) OH is the overhead byte of the optical channel data unit, providing maintenance and operation functions. OPUk (Optical Channel Payload Unit k, Optical Channel Payload Unit k) OH is an overhead byte of the Optical Channel Payload Unit, and provides a function of client signal adaptation. The OPUk is an optical channel payload unit, which provides the function of carrying client signals. FEC is a forward error correction byte that provides error detection and error correction functions. The coefficient k indicates the supported bit rate and different kinds of OPUk, ODUk and OTUk. k=1 means the bit rate level is 2.5Gbit/s, k=2 means the bit rate level is 10Gbit/s, k=3 means the bit rate level is 40Gbit/s, k=4 means the bit rate level is 100Gbit/s, k =flex means that the bit rate is arbitrary.

In the prior art, 10G bandwidth is used to transmit multiple channels of CPRI signals at the same rate, and 6 channels of CPRI can be provided on OTU2r (OTU2r is an overclocked OTU2 rate, OTU2r rate with FEC is 12.639Gbit/s, and OTU2 is 10.709Gbit/s). Option 3, or 3-way CPRI option 4, or 3-way CPRI option 5, etc. For the received CPRI signal, perform 8B/10B decoding processing, and then map to the corresponding time slot through BMP (Bit-synchronous Mapping Procedure, bit synchronous mapping procedure), OPU2r divides the time slot in units of bytes, and in the corresponding Add mapping overhead information to the slot overhead position. The AxC (Antenna-Carrier, AxC) container carrying I/Q data in the CPRI basic frame is statically configured, and the rate is fixed point-to-point. Even if there is idle filling in the CPRI frame, or there is time slot fragmentation, the CPRI interface is still according to the peak load and Operate at the rate corresponding to full carrier work. With the rapid increase of the traffic, the rate of the CPRI interface is also higher and higher, and there may be more and more idle areas in the CPRI frame. In this case, when the OTN bearer network carries CPRI signals, no matter how many effective AxC containers are carried on the CPRI basic frame, the OTN bearer network must transmit the CPRI basic frame as a whole, resulting in a waste of bandwidth.

Contents of the invention

In view of this, embodiments of the present invention provide a method and device for transmitting public radio interface signals, which can solve the problem of bandwidth waste in OTN carrying CPRI signals.

In the first aspect, an embodiment of the present invention provides a method for sending a public radio interface CPRI signal, including: the sending device acquires the CPRI signal, and acquires the antenna carrier AxC container configuration information of the CPRI signal, and the AxC container configures The information includes indication information of a valid AxC container; according to the AxC container configuration information, the valid AxC container in the CPRI signal is mapped into a virtual basic frame; the virtual basic frame is mapped into an optical channel data unit ODU, and the The ODU is mapped to the optical channel transmission unit OTU, and the OTU is sent to the optical transmission channel.

The sending device maps the effective AxC container in the CPRI signal to the virtual basic frame according to the AxC container configuration information, which improves the utilization rate of the OTN transmission bandwidth.

With reference to the implementation of the first aspect, in a first possible implementation of the first aspect, the indication information of the effective AxC container includes: the column width of the effective AxC container, the starting column position of the effective AxC container, and the effective AxC container The total length of the number of columns.

Optionally, the indication information of the valid AxC container is used to identify the valid AxC container in the CPRI signal, and may also include an indication identifier, for example, identify which are valid AxC containers and which are invalid AxC containers in the overhead indication corresponding to the AxC container . Optionally, the AxC container configuration information may also include location information or indication information of invalid AxC containers.

The effective AxC in the CPRI signal can be extracted according to the indication information of the effective AxC container, which can improve the utilization rate of the OTN transmission bandwidth carrying the CPRI signal.

With reference to the first aspect, or the first possible implementation manner of the first aspect, in a second possible implementation manner of the first aspect, the frame structure of the virtual basic frame is the same as the frame structure of the CPRI basic frame.

Optionally, the frame structure of the virtual basic frame may also be the same as the frame structure of the CPRI superframe.

In the second aspect, the embodiment of the present invention provides a method for receiving public radio interface CPRI signals, the method includes: the receiving device receives the optical channel transmission unit OTU from the optical transmission channel, demaps the OTU, and obtains the optical channel data Unit ODU; demap the ODU to obtain a virtual basic frame; demap the effective antenna carrier AxC container of the CPRI signal from the virtual basic frame, and convert the AxC container according to the AxC container configuration information of the CPRI signal The valid AxC container of the CPRI signal is restored to the CPRI signal, and the AxC container configuration information includes indication information of the valid AxC container.

The receiving device demaps the effective AxC container from the virtual basic frame, restores the effective AxC container to the CPRI signal according to the AxC container configuration information of the CPRI signal, and improves the utilization rate of the OTN transmission bandwidth.

With reference to the implementation of the second aspect, in the first possible implementation of the second aspect, the indication information of the effective AxC container includes: the column width of the effective AxC container, the starting column position of the effective AxC container, and the effective AxC container The total length of the number of columns.

With reference to the second aspect, or the first possible implementation manner of the second aspect, in the second possible implementation manner of the second aspect, the frame structure of the virtual basic frame is the same as the frame structure of the CPRI basic frame.

In a third aspect, an embodiment of the present invention provides an OTN device for an optical transport network. The OTN device includes: an acquisition module, configured to acquire a CPRI signal, and acquire the configuration information of the antenna carrier AxC container of the CPRI signal. The AxC The container configuration information includes indication information of a valid AxC container; the mapping module is used to map the valid AxC container in the CPRI signal into a virtual basic frame according to the AxC container configuration information; the mapping module is used to map the The virtual basic frame is mapped into an optical channel data unit ODU, the ODU is mapped into an optical channel transmission unit OTU, and the sending module is configured to send the OTU into an optical transmission channel.

With reference to the implementation of the third aspect, in the first possible implementation of the third aspect, the indication information of the effective AxC container includes: the column width of the effective AxC container, the starting column position of the effective AxC container, and the effective AxC container The total length of the number of columns.

With reference to the third aspect, or the first possible implementation manner of the third aspect, in a second possible implementation manner of the third aspect, the frame structure of the virtual basic frame is the same as the frame structure of the CPRI basic frame.

In a fourth aspect, an embodiment of the present invention provides an optical transport network OTN device, including: a receiving module, configured to receive an optical channel transmission unit OTU from an optical transmission channel; a demapping module, configured to demap the OTU , to obtain the optical channel data unit ODU; demap the ODU to obtain a virtual basic frame; demap the effective antenna carrier AxC container of the CPRI signal from the virtual basic frame, according to the AxC container configuration information of the CPRI signal The valid AxC container of the CPRI signal is restored to the CPRI signal, and the AxC container configuration information includes indication information of the valid AxC container.

With reference to the implementation of the fourth aspect, in the first possible implementation of the fourth aspect, the indication information of the effective AxC container includes: the column width of the effective AxC container, the starting column position of the effective AxC container, and the effective AxC container The total length of the number of columns.

With reference to the fourth aspect, or the first possible implementation manner of the fourth aspect, in a second possible implementation manner of the fourth aspect, the frame structure of the virtual basic frame is the same as the frame structure of the CPRI basic frame.

In the fifth aspect, an embodiment of the present invention provides an OTN system, including: a sending device and a receiving device, the sending device is used to obtain a CPRI signal, and obtain the antenna carrier AxC container configuration information of the CPRI signal, and the AxC container configuration The information includes indication information of a valid AxC container; according to the AxC container configuration information, the valid AxC container of the CPRI signal is mapped into a virtual basic frame; the virtual basic frame is mapped into an optical channel data unit ODU, and the The ODU is mapped into the optical channel transmission unit OTU, and the OTU is sent to the optical transmission channel. The receiving device is used to receive the optical channel transmission unit OTU from the optical transmission channel, and demap the OTU to obtain an optical channel data unit ODU; demap the ODU to obtain a virtual basic frame; from the virtual basic frame The effective antenna carrier AxC container of the CPRI signal is demapped in the middle, and the effective AxC container of the CPRI signal is restored to the CPRI signal according to the AxC container configuration information of the CPRI signal, and the AxC container configuration information includes the effective AxC container Instructions for the container.

In the sixth aspect, an embodiment of the present invention provides an OTN device, including: a main control board, a tributary board, a cross-connect board, and a line board. The main control board executes pre-configured program codes to control the tributary board, the cross-connect board, and the line Any one or more single boards in the boards execute the method described in the first aspect and any possible implementation manner of the first aspect.

In the seventh aspect, the embodiment of the present invention provides an OTN device, including: a main control board, a tributary board, a cross-connect board, and a line board. The main control board executes pre-configured program codes to control the tributary board, the cross-connect board, and the line Any one or more single boards in the boards execute the method described in the second aspect and any possible implementation manner of the second aspect.

The technical solution provided by the embodiment of the present invention can be applied to the application scenario of the front-end backhaul of the CPRI signal. The generating device maps the effective AxC container into the virtual basic frame according to the AxC container configuration information of the CPRI signal, which improves the utilization rate of the OTN transmission bandwidth.

Description of drawings

The following will briefly introduce the drawings used in describing the background technology and embodiments.

FIG. 1 is a schematic structural diagram of an OTN frame in the prior art;

FIG. 2 is a schematic structural diagram of a network architecture provided by an embodiment of the present invention;

FIG. 3 is a schematic diagram of a processing method for OTN carrying CPRI signals in the prior art;

Fig. 4 is a schematic structural diagram of a CPRI data frame provided by an embodiment of the present invention;

FIG. 5 is an exemplary flow chart of a method for sending a CPRI signal provided by an embodiment of the present invention;

FIG. 6 is a schematic diagram of a frame format of a CPRI signal provided by an embodiment of the present invention;

FIG. 7 is a schematic structural diagram of a virtual basic frame provided by an embodiment of the present invention;

Fig. 8 is a schematic structural diagram of a virtual basic frame provided by an embodiment of the present invention;

FIG. 9 is a schematic diagram of a clock tracking method provided by an embodiment of the present invention;

FIG. 10 is a schematic structural diagram of a phase-locked loop provided by an embodiment of the present invention;

FIG. 11 is a schematic diagram of a CPRI signal mapping process provided by an embodiment of the present invention;

FIG. 12 is a schematic diagram of a frame format of a CPRI signal provided by an embodiment of the present invention;

Fig. 13 is a schematic structural diagram of a virtual basic frame provided by an embodiment of the present invention;

Fig. 14 is a schematic structural diagram of a virtual basic frame provided by an embodiment of the present invention;

FIG. 15 is a schematic diagram of a CPRI signal mapping process provided by an embodiment of the present invention;

FIG. 16 is an exemplary flowchart of a method for receiving a CPRI signal provided by an embodiment of the present invention;

Fig. 17 is a schematic structural diagram of a sending device provided by an embodiment of the present invention;

Fig. 18 is a schematic structural diagram of a receiving device provided by an embodiment of the invention;

FIG. 19 is a schematic structural diagram of an OTN system provided by an embodiment of the present invention;

Fig. 20 is a schematic structural diagram of an OTN device provided by an embodiment of the present invention.

detailed description

Embodiments of the present invention will be described below in conjunction with the accompanying drawings.

A method, device, and system for sending and receiving CPRI signals proposed by the embodiments of the present invention can be applied to a scenario where a front end of a CPRI signal is backhauled. Fig. 2 is a schematic structural diagram of a network architecture provided by an embodiment of the present invention. As shown in FIG. 2 , the network architecture includes wireless equipment of distributed base stations, BBU and RRU, and also includes OTN equipment. Specifically, the OTN equipment may include a transponder Tranponder and a multiplexing transponder Muxponder. The BBU, RRU, and OTN equipment can be uniformly controlled through the controller. Specifically, the controller may be an SDN (Software Defined Network, software defined network) controller. The BBU and RRU are connected through one or more OTN devices, and the CPRI signal transmitted between the BBU and RRU can be carried and transmitted through one or more OTN devices. For example, when the BBU acts as the sending end, the CPRI signal sent by the BBU is received by the RRU after passing through one or more OTN devices; or when the RRU acts as the sending end, the CPRI signal sent by the RRU is received by the BBU after passing through one or more OTN devices.

Fig. 3 is a schematic diagram of a processing method for carrying CPRI signals through the OTN in the prior art. For CPRI option 1 and CPRI option 2, they are mapped to OPU0 through the Generic Mapping Procedure (GMP); for CPRI option 3, they are mapped to OPU1 through GMP; for CPRI options 4 to 8, through bit The way of synchronous mapping is mapped to OPUflex. Then, multiple low-order OPU0, OPU1, and OPUflex are mapped to high-order OPUk through GMP, and ODUk and OTUk overhead are added, and finally transmitted through OTUk. This solution is for the transparent transmission of the bit stream. Each CPRI signal is first encapsulated and mapped to the low-order OPU0, OPU1 or OPUflex, and then mapped and multiplexed to the high-order OPUk. In the process of mapping CPRI options 1 to 6 to low-order OPU0, OPU1 or OPUflex, since the payload area of OPU0, OPU1 or OPUflex is not fully utilized, serious bandwidth waste exists.

Specifically, the CPRI data frame is defined based on the frame period structure of the Universal Mobile Telecommunications System Terrestrial Radio Access (UTRA) air interface. The 10ms frame period of the UTRA air interface includes 15 time slots, each time slot includes 2560 power control cycles, also called 2560 chips (Chips), and the rate is 2560Chips*15/10ms=3.84Mcps. As shown in Figure 4, the CPRI data frame also defines the CPRI 10ms frame, and the CPRI 10ms frame contains 150 superframes, each superframe contains 256 basic frames, and the basic frame rate is 3,840,000 frames per second, 150*256/10ms= 3.84Mfps. A basic frame contains 16 words, and each word is transmitted from left to right and top to bottom. As shown in Table 1, use #Z to index the superframe number, #X to index the basic frame number, #W to index the word size, #Y to index the control word size, and #B to index the bit number.

Table 1

Each word in the CPRI basic frame contains Y bytes, and Y is related to the rate option of CPRI. For example, 1 times the reference rate: 491.52Mbps x 1, a word contains 1 byte; 2 times the reference rate: 491.52Mbps x 2, a word contains 2 bytes; 4 times the reference rate: 491.52Mbps x 4, a word contains 4 bytes. As shown in Table 2, the CPRI basic frame includes 1 control word and 15 data words. The control word is used to represent interface control information and overhead information, and the data word is used to carry I/Q data.

Table 2

1x491.52 (Mbps) rate CPRI basic frame structure

4x491.52 (Mbps) rate CPRI basic frame structure

Wherein, the I/Q data carried in the data word is a digital representation of the antenna carrier, and the I/Q data carrying one antenna carrier becomes an AxC container (AxC container). The mapping rules of the AxC containers in the CPRI basic frame are as follows: each AxC container is sent as a block; overlapping AxC containers are not allowed, that is, there cannot be data overlap between different AxC containers.

In the embodiment of the present invention, the CPRI signal is carried by the OTN. The OTN sender device maps the CPRI signal to be carried into the virtual basic frame according to the configuration information of the AxC container. Specifically, the AxC container configuration information includes valid AxC container indication information in the CPRI signal, which may include the column width of the valid AxC container in the CPRI signal, the starting column position of the valid AxC container, the total length of the valid AxC container, and the number of columns. Wherein, the frame structure of the virtual basic frame may be the same as the frame structure of the CPRI basic frame, and may also be the same as the frame structure of the CPRI super frame. The effective AxC container may be mapped into the virtual basic frame according to the effective AxC container indication information of the CPRI signal, and the wireless AxC container in the CPRI signal may not be mapped into the virtual basic frame. Further, the virtual basic frame mapped with the effective AxC container is mapped into ODU and/or OTU. Since the effective AxC container in the CPRI signal is mapped into the virtual basic frame, the OTN does not need to bearer the invalid AxC container, thereby improving the utilization rate of the OTN transmission bandwidth.

Fig. 5 is an exemplary flowchart of a method for sending a CPRI signal provided by an embodiment of the present invention. As shown in Figure 5, the method can be performed by an OTN device, including the following steps:

S501: The sending device acquires a CPRI signal, and acquires AxC container configuration information of the CPRI signal, where the AxC container configuration information includes indication information of a valid AxC container.

Specifically, the sending device may be an OTN device, and the sending device may receive a CPRI signal from a BBU or an RRU. Wherein, the frame structure of the CPRI signal may include a CPRI basic frame or a CPRI super frame. The AxC container configuration information can be pre-configured on the sending device and the receiving device, and can also be configured on only one device, such as the sending device, and the sending device sends the configured AxC container configuration information to the receiving device. The AxC container configuration information can also be collected from the wireless device BBU and RRU through the SDN controller, and then sent to the corresponding OTN device at the sending end and receiving end.

Optionally, the indication information of the effective AxC container is used to indicate the effective AxC container in the CPRI signal, which may be the location information of the effective AxC container, for example, may include the column width of the effective AxC container in the CPRI signal, and the starting column of the effective AxC container position, total length columns of valid AxC containers, etc. Optionally, the indication information of the valid AxC container may also include indication identifiers, for example, identifying which are valid AxC containers and which are invalid AxC containers in the overhead indication corresponding to the AxC containers. Optionally, the AxC container configuration information may also include location information or indication information of invalid AxC containers.

Assume that there are currently two CPRI signals to be carried, CPRI#0 and CPRI#1. FIG. 6 shows the frame format of CPRI#0 and CPRI#1 signals, wherein the rate of CPRI#0 is 1.22Gbps, and the rate of CPRI#1 is 2.45Gbps. The AxC container configuration information of CPRI#0 includes: the column width of the effective AxC container is 8 bits, the starting column position of the effective AxC container is the 18th column, and the total length of the effective AxC container is 13 columns. The AxC container configuration information of CPRI#1 includes: the column width of the effective AxC container is 16 bits, the starting column position of the effective AxC container is the 14th column, and the total length of the effective AxC container is 17 columns.

S502: Map a valid AxC container in the CPRI signal into a virtual basic frame according to the AxC container configuration information.

Specifically, the effective AxC containers of the two signals can be extracted respectively according to the effective AxC container indication information of the two signals, including, for example, the column width, starting column position, and total length of the effective AxC container.

Before mapping the effective AxC container of the CPRI signal to the virtual basic frame, the virtual basic frame should be constructed first. Specifically, the construction mode of the virtual basic frame may include the following two types:

Method 1: Construct according to the ODU rate of the physical port carrying the CPRI signal. Specifically, the structure of the virtual basic frame may be the same as that of the CPRI basic frame, including 16 words, and each word includes m bytes. Wherein, m is related to the rate of the ODU carrying the CPRI signal. For example, when the CPRI signal is carried by the ODU1, the value of m is 4. The relationship between the value of m and the ODU rate is shown in Table 3. It is worth noting that as the ODU rate changes, m can also have other values.

table 3

ODUk ODU rate m ODU1 2.498Gb/s 4 ODU2 10.037Gb/s 20 ODU3 40.319Gb/s 80 ODU4 104.794Gb/s 200 ODUC n*104.794Gb/s n*200

Method 2: Construct a virtual basic frame according to the total number of valid AxC containers in each CPRI signal to be carried. Specifically, the sending device obtains the n value of each channel of CPRI signals to be carried according to the column width and total length columns of the effective AxC container in the acquired AxC container configuration information. The n value of each CPRI signal may be the total number of effective AxC containers of the CPRI signal, which may be represented by the product of the column width of the effective AxC container and the total length of columns. The n value of each CPRI signal is the sum of the n values of each CPRI signal. For example, the n value of the above-mentioned CPRI#0 signal is 13 columns*8 bits, the n value of the CPRI#1 signal is 17 columns*16 bits, and the n value of the two signals is between 13 columns*8 bits and 17 columns*16 bits with.

Optionally, the virtual basic frame can also be pre-constructed on the sending device according to the ODU rate of the physical port, and then adjusted according to the total number of valid AxC containers of the CPRI signal to be carried. If the calculated n value of each CPRI signal is greater than the carrying capacity of the current virtual basic frame, a new physical port can be added to reconstruct a new virtual basic frame, that is, the m value of the virtual basic frame is increased; if the calculated If the n value of the CPRI signal is less than the capacity of the current virtual basic frame, the physical ports can be reduced, that is, the m value of the virtual basic frame can be reduced. The m value of the virtual basic frame is the same as the m value of the ODU carrying the virtual basic frame.

Assuming that the physical port of ODU1 is used to carry the above two CPRI signals, the structure of the virtual basic frame is shown in Figure 7 . In Fig. 7, the m value of the virtual basic frame corresponding to ODU1 is 4, the first two columns of the virtual basic frame can be the control word of the virtual basic frame, and the definition of the control word of the virtual basic frame can be the same as that of the CPRI basic frame.

FIG. 8 is a schematic structural diagram of mapping two signals of CPRI#0 and CPRI#1 to the virtual basic frame as shown in FIG. 7 . In addition to mapping the effective AxC containers of the two-way signals into the virtual basic frame, the control words of the two-way signals can also be mapped into the virtual basic frame. Specifically, during the process of mapping the effective AxC containers of the two signals to the virtual basic frame, the virtual basic frame tracks the clock of the CPRI signal to be carried, and maps the effective AxC container and the control word in the CPRI basic frame to the in the virtual base frame. As shown in FIG. 9 , the clock of one of the CPRI signals can be tracked as a reference clock, and the clock of the other CPRI signal can be based on the reference clock. During the mapping process, alignment can be performed in units of columns.

The specific implementation process of the virtual basic frame tracking the clock to carry the CPRI signal is as follows: recover the clock signal from the line CPRI signal, send the recovered clock signal of the CPRI signal into the phase-locked loop, and after it is successfully locked, the phase-locked loop stabilizes Outputs the clock signal for the virtual basic frame. At this time, the clock signal of the virtual basic frame and the clock signal of the CPRI signal are synchronized, and this process is clock tracking. Specifically, FIG. 10 is a schematic structural diagram of a phase-locked loop, including a phase detector, a loop filter, a voltage-controlled oscillator, a frequency divider, and the like. The working principle of the phase-locked loop is consistent with that of the prior art, and will not be repeated here.

S503: Map the virtual basic frame into the ODU, map the ODU into the OTU, and send the OTU to the optical transmission channel.

As shown in FIG. 11 , specifically, the virtual basic frame can be mapped to the payload slot of ODU1 through BMP or BGMP (Bit-synchronous Generic Mapping Procedure, bit-synchronous general mapping procedure). Optionally, mapping overhead information may be added to the overhead of the ODU1, such as a payload type indication, used to indicate a mapping manner for mapping the CPRI signal to the ODU1. Specifically, the payload type indication may be a PT bit, indicating that the valid AxC container of the CPRI signal is mapped to the ODU1, and the idle time slot (that is, the invalid AxC container) is not mapped to the ODU1. In the process of demapping from ODU1, the receiving device needs to report the payload type indication to the controller to realize the monitoring and alarm function.

After the virtual basic frame is mapped to ODU1, OTU overhead can also be added to ODU1 to form OTU1, and the OTU1 carrying the CPRI signal is sent out.

In the embodiment of the present invention, multiple physical ports may also be used to carry multiple CPRI signals. Specifically, a virtual basic frame is constructed according to the ODU rate of each physical port. Among the i ODUs carrying multiple CPRI signals (i is a positive integer greater than or equal to 2), the m values of each ODU are m ₁ , m ₂ ,..., m _i , then the m values of the constructed virtual basic frame are m ₁ +m ₂ ...+m _i . As shown in FIG. 12 , the CPRI signals to be carried include three channels, CPRI#0, CPRI#1 and CPRI#4, and the frame format is similar to that in FIG. 6 . For valid AxC container configuration information of CPRI#0 and CPRI#1, refer to step S501. The valid AxC container configuration information of CPRI#4 includes: the column width of the valid AxC container is 32 bits, the starting column position of the valid AxC container is the 24th column, and the total length of the valid AxC is 9 columns. Assuming that two channels of ODU1 are used to carry the above three channels of CPRI signals, the structure of the virtual basic frame is shown in Figure 13 . The virtual basic frame m corresponding to the two ODU1s is 8, and the first two columns of the virtual basic frame can be control words. As shown in FIG. 14 , the process of mapping the three CPRI signals into the virtual basic frame is similar to the above-mentioned process of mapping the two CPRI signals into the virtual basic frame, and will not be repeated here.

After mapping the effective AxC container and control word of the CPRI signal to the virtual basic frame, map the virtual basic frame into ODUXn. Wherein, X represents a reference rate, which may be 100Gb/s, 10Gb/s, or 25Gb/s, etc., and n is a positive integer. For example, ODUCn represents an n*100G ODU bearer container, and adopts a variable frame structure of n*4 rows*3824 columns. In this embodiment, ODUXn is composed of two ODU1s, the reference rate is 2.498Gb/s, and n is 2. As shown in Figure 15, the virtual basic frame is mapped to ODUXn through BMP or BGMP, and then ODUXn is mapped to two-way OTU1. Optionally, the ODUXn can also be mapped to one OTUXn, wherein the OTUXn is composed of two OTU1s.

In the embodiment of the present invention, the sending device maps the effective AxC container of the CPRI signal into the virtual basic frame according to the AxC container configuration information, thereby improving the utilization rate of the OTN transmission bandwidth.

Fig. 16 is an exemplary flowchart of a method for receiving a CPRI signal provided by an embodiment of the present invention. As shown in Figure 16, the method may be performed by an OTN device, including the following steps:

S601: The receiving device receives an optical channel transmission unit OTU from an optical transmission channel, and demaps the OTU to obtain an optical channel data unit ODU.

For example, the receiving device receives OTU1 in the embodiment of FIG. 5 from the optical transmission channel, and demaps from OTU1 to obtain ODU1.

S602: Demap the ODU to obtain a virtual basic frame.

For example, ODU1 is demapped to obtain a virtual basic frame. Wherein, the structure and construction process of the virtual basic frame can refer to the embodiment shown in FIG. 5 , which will not be repeated here. The virtual basic frame demapped from the ODU can carry the effective AxC container of the CPRI signal.

S603: Demap the virtual basic frame to obtain an effective AxC container of the CPRI signal, restore the effective AxC container of the CPRI signal to the CPRI signal according to the AxC container configuration information of the CPRI signal, and configure the AxC container The information includes an indication of a valid AxC container.

The AxC container configuration information includes the indication information of the valid AxC container in the CPRI signal, which may include the column width of the valid AxC container in the CPRI signal, the starting column position of the valid AxC container, the total length of the valid AxC container, and the number of columns. During the process of restoring the valid AxC container to the CPRI signal, it is also possible to fill idle time slots in positions other than the valid AxC container and the control word in the CPRI signal. The recovered CPRI signals may include CPRI#0, CPRI#1 and so on.

In the embodiment of the present invention, the receiving device demaps the effective AxC container of the CPRI signal from the virtual basic frame, and restores the CPRI signal according to the configuration information of the AxC container, thereby improving the utilization rate of the OTN transmission bandwidth.

Fig. 17 is a schematic structural diagram of a sending device provided by an embodiment of the present invention. As shown in FIG. 17 , the sending device may be an OTN device, including: an acquiring module 171 , a mapping module 172 and a sending module 173 .

The obtaining module 171 is used to obtain the CPRI signal, and obtain the antenna carrier AxC container configuration information of the CPRI signal, the AxC container configuration information includes the indication information of the effective AxC container; the mapping module is used to configure the AxC container according to the AxC container configuration information mapping valid AxC containers in the CPRI signal into a virtual basic frame;

The mapping module 172 is configured to map the virtual basic frame into an optical channel data unit ODU, and map the ODU into an optical channel transport unit OTU;

The sending module 173 is configured to send the OTU to the optical transmission channel.

Optionally, the indication information of the valid AxC container includes: the column width of the valid AxC container, the starting column position of the valid AxC container, and the total length and column number of the valid AxC container.

Optionally, the frame structure of the virtual basic frame is the same as the frame structure of the CPRI basic frame.

Optionally, the sending device further includes a construction module, configured to construct the virtual basic frame according to the column width and total length of the effective AxC container before mapping the effective AxC container of the CPRI signal into the virtual basic frame .

Optionally, there is a one-to-one correspondence between the number of bytes contained in each word in the virtual basic frame and the rate of the ODU signal.

In the embodiment of the present invention, the sending device maps the effective AxC container of the CPRI signal into the virtual basic frame according to the AxC container configuration information, thereby improving the utilization rate of the OTN transmission bandwidth.

Fig. 18 is a schematic structural diagram of a receiving device provided by an embodiment of the present invention. As shown in FIG. 18 , the receiving device may be an OTN device, and includes: a receiving module 181 and a demapping module 182 .

The receiving module 181 is configured to receive an optical channel transmission unit OTU from the optical transmission channel;

The demapping module 182 is used to demap the OTU to obtain an optical channel data unit ODU; demap the ODU to obtain a virtual basic frame; demap the virtual basic frame to obtain a valid CPRI signal The antenna carrier AxC container restores the effective AxC container of the CPRI signal to the CPRI signal according to the AxC container configuration information of the CPRI signal, where the AxC container configuration information includes indication information of the effective AxC container.

Optionally, the indication information of the valid AxC container includes: the column width of the valid AxC container, the starting column position of the valid AxC container, and the total length and column number of the valid AxC container.

Optionally, the frame structure of the virtual basic frame is the same as the frame structure of the CPRI basic frame.

Optionally, the demapping module 182 is further configured to demap the control word of the CPRI signal from the virtual basic frame.

Optionally, the receiving device further includes a filling module, configured to fill an idle time slot in an area outside the valid AxC container and the control word.

In the embodiment of the present invention, the receiving device demaps the effective AxC container of the CPRI signal from the virtual basic frame, and restores the CPRI signal according to the configuration information of the AxC container, thereby improving the utilization rate of the OTN transmission bandwidth.

Fig. 19 is a schematic structural diagram of an OTN system provided by an embodiment of the present invention. As shown in FIG. 19 , the system includes: a sending device 191 and a receiving device 192 . Wherein, the sending device 191 and the receiving device 192 may be OTN devices.

The sending device 191 is configured to acquire a CPRI signal, and acquire antenna carrier AxC container configuration information of the CPRI signal, where the AxC container configuration information includes indication information of a valid AxC container; transmit the CPRI signal according to the AxC container configuration information The effective AxC container in is mapped to the virtual basic frame; the virtual basic frame is mapped to the optical channel data unit ODU, the ODU is mapped to the optical channel transmission unit OTU, and the OTU is sent to the optical transmission channel .

The receiving device 192 is configured to receive the optical channel transmission unit OTU from the optical transmission channel, and demap the OTU to obtain an optical channel data unit ODU; demap the ODU to obtain a virtual basic frame; from the virtual The effective antenna carrier AxC container of the CPRI signal is demapped in the basic frame, and the effective AxC container of the CPRI signal is restored to the CPRI signal according to the AxC container configuration information of the CPRI signal, and the AxC container configuration information includes Indication of a valid AxC container.

In the embodiment of the present invention, the sending device maps the effective AxC container in the CPRI signal to the virtual basic frame according to the AxC container configuration information, and the receiving device demaps the effective AxC container of the CPRI signal from the virtual basic frame, and configures the AxC container according to the AxC container The information is restored to the CPRI signal, which improves the utilization rate of the OTN transmission bandwidth.

FIG. 20 is a schematic structural diagram of an OTN device 200 provided by an embodiment of the present invention. As shown in FIG. 20 , the OTN device 200 includes a main control board 201 , an OTN line board 202 , a cross-connect board 203 and an OTN line board 204 . The transmission direction of the service can be from the client side to the line side, or from the line side to the client side. Services sent or received by the client side are called client-side services, and services received or sent by the line side are called WDM-side services. The business processing processes in the two directions are reverse processes. In this embodiment, the direction from the client side to the line side is taken as an example for illustration:

The main control board 201 is connected to the OTN tributary board 202 , the cross-connect board 203 , and the OTN line board 204 through the bus or directly, and controls and manages the OTN tributary board 202 , the cross-connect board 203 , and the OTN line board 204 .

The OTN tributary board 202 completes encapsulation and mapping of customer services. Customer services include various types of services, such as ATM (Asynchronous Transfer Mode, Asynchronous Transfer Mode) services, SDH (Synchronous Digital Hierarchy, Synchronous Digital Hierarchy) services, Ethernet services, CPRI services, storage services, etc. Specifically, the tributary board 202 is used to receive customer services from the customer side, map the received customer service packages to ODU (Optical Channel Data Unit, Optical Channel Data Unit) signals and add corresponding OTN management and monitoring overhead. On the OTN tributary board 202, the ODU signal may be a low-order ODU signal, such as ODU0, ODU1, ODU2, ODU3, ODUflex, etc., and the OTN management monitoring overhead may be the ODU overhead. For different types of customer services, different methods are used to encapsulate and map to different ODU signals.

The cross-connection board 203 completes the full cross-connection of the tributary board and the line board, and realizes flexible cross-scheduling of ODU signals. Specifically, the cross-connect board can transmit ODU signals from any tributary board to any line board, or transmit OTU signals from any line board to any line board, and can also transmit customer signals from any tributary board transmitted to any tributary board.

The OTN line board 204 forms an OTU (Optical Channel Transport Unit, Optical Channel Transport Unit) signal from the ODU signal and sends it to the line side. Before the ODU signals form OTU signals, the OTN line board 204 can multiplex the low-order multiple ODU signals into the high-order ODU signals. Then the high-order ODU signal is added with corresponding OTN management and monitoring overhead to form an OTU signal and sent to the optical transmission channel on the line side. On the OTN line board, the high-order ODU signals can be ODU1, ODU2, ODU3, ODU4, etc., and the OTN management and monitoring overhead can be OTU overhead.

The main control board 201 can execute pre-configured program codes to control any one or more boards in the OTN tributary board 202, the cross-connect board 203, and the OTN line board 204 to complete the following functions: obtain the CPRI signal, and obtain the The antenna carrier AxC container configuration information of the CPRI signal, the AxC container configuration information includes the indication information of the effective AxC container; according to the AxC container configuration information, the effective AxC container in the CPRI signal is mapped into a virtual basic frame; the The virtual basic frame is mapped into an optical channel data unit ODU, the ODU is mapped into an optical channel transmission unit OTU, and the OTU is sent to an optical transmission channel.

The OTN device in the embodiment of the present invention may also be used to execute the method steps in the embodiments shown in FIG. 5 and FIG. 16 .

In the embodiment of the present invention, the sending device maps the effective AxC container in the CPRI signal to the virtual basic frame according to the AxC container configuration information, and the receiving device demaps the effective AxC container of the CPRI signal from the virtual basic frame, and configures the AxC container according to the AxC container The information is restored to the CPRI signal, which improves the utilization rate of the OTN transmission bandwidth.

Those of ordinary skill in the art will understand that various aspects of the present invention, or possible implementations of various aspects, may be embodied as systems, methods or computer program products. Accordingly, aspects of the present invention, or possible implementations of various aspects, may take the form of an entirely hardware embodiment, an entirely software embodiment (including firmware, resident software, etc.), or an embodiment combining software and hardware aspects, described in These are collectively referred to herein as "circuits," "modules," or "systems." In addition, aspects of the present invention, or possible implementations of various aspects, may take the form of computer program products, and computer program products refer to computer-readable program codes stored in computer-readable media.

The above descriptions are only a few embodiments of the present invention, and those skilled in the art can make various changes or modifications to the present invention according to the disclosure of the application documents without departing from the spirit and scope of the present invention.

Claims (12)

1. a kind of method for sending public radio interface CPRI signal, it is characterised in that methods described includes：

Send equipment and obtain the CPRI signals, and obtain the antenna carrier AxC containers of the CPRI signals and match somebody with somebody Confidence ceases, and the AxC containers configuration information includes the configured information of effective AxC containers；

According to the AxC containers configuration information by effective AxC container mappings of the CPRI signals to virtual base In this frame；

The virtual basic frame is mapped in Optical Channel Data Unit-k ODU, the ODU is mapped into light leads to In road delivery unit OTU, the OTU is sent in transmission line.

2. the method as described in claim 1, it is characterised in that the configured information bag of effective AxC containers Include：

The total length of the col widths of effective AxC containers, the starting column location of effective AxC containers and effective AxC containers Columns.

3. the method as described in claim 1, it is characterised in that the frame structure and CPRI of the virtual basic frame The frame structure of basic frame is identical.

4. the method as described in claim 1, it is characterised in that hold effective AxC of the CPRI signals Before device is mapped in virtual basic frame, in addition to：

According to the col width of effective AxC containers and total length columns the construction virtual basic frame.

5. the method as described in claim 1, it is characterised in that methods described also includes：

The control word of the CPRI signals is mapped in the virtual basic frame.

6. the method as described in claim 1-5 is any, it is characterised in that each word in the virtual basic frame Comprising byte number and the speed of the ODU signals there is one-to-one relation.

7. a kind of optical transport network OTN equipment, it is characterised in that the OTN equipment includes：

Acquisition module, for obtaining public radio interface CPRI signal, and obtains the antenna of the CPRI signals Carrier wave AxC container configuration informations, the AxC containers configuration information includes the configured information of effective AxC containers；

Mapping block, for being held effective AxC of the CPRI signals according to the AxC containers configuration information Device is mapped in virtual basic frame；

The mapping block, will for the virtual basic frame to be mapped in Optical Channel Data Unit-k ODU The ODU is mapped in Optical Channel Transport Unit-k OTU,

Sending module, for the OTU to be sent in transmission line.

8. OTN equipment as claimed in claim 7, it is characterised in that the instruction of effective AxC containers Information includes：

The total length of the col widths of effective AxC containers, the starting column location of effective AxC containers and effective AxC containers Columns.

9. OTN equipment as claimed in claim 7, it is characterised in that the frame structure of the virtual basic frame It is identical with the frame structure of the basic frames of CPRI.

10. OTN equipment as claimed in claim 7, it is characterised in that the OTN equipment also includes construction Module,

The constructing module, for by effective AxC container mappings of the CPRI signals into virtual basic frame Before, according to the col width of effective AxC containers and total length columns the construction virtual basic frame.

11. OTN equipment as claimed in claim 7, it is characterised in that the mapping block, is additionally operable to：

The control word of the CPRI signals is mapped in the virtual basic frame.

12. the OTN equipment as described in claim 7-11 is any, it is characterised in that in the virtual basic frame There is one-to-one relation in the byte number and the speed of the ODU signals that each word is included.