WO2017124787A1

WO2017124787A1 - Method and device for transmitting common public radio interface signal

Info

Publication number: WO2017124787A1
Application number: PCT/CN2016/102612
Authority: WO
Inventors: 向俊凌; 李兴文
Original assignee: 华为技术有限公司
Priority date: 2016-01-21
Filing date: 2016-10-19
Publication date: 2017-07-27
Also published as: CN106992838B; CN106992838A

Abstract

Disclosed in an embodiment of the present invention is a method of transmitting a common public radio interface (CPRI) signal, comprising: a transmitting device acquires the CPRI signal, and acquires configuration information of an antenna carrier (AxC) container of the CPRI signal, the configuration information of the AxC container comprising indication information of an active AxC container; mapping the active AxC container in the CPRI signal according to the configuration information of the AxC container to a virtual basic frame; and mapping the virtual basic frame to an optical channel data unit (ODU), mapping the ODU to an optical channel transport unit (OTU), and transmitting the OTU to an optical transport channel. In the present invention, a transmitting device maps an active AxC container in a CPRI signal to a virtual basic frame, thus increasing the utilization rate of transmission bandwidth of an optical transport network (OTN).

Description

Method and device for transmitting public wireless interface signals

Technical field

The present invention relates to the field of communications, and in particular, to a method and device for transmitting a public radio interface signal.

Background technique

In order to achieve a low-cost, fast establishment of a wireless network in a situation where the location of the machine room or the machine room is not ideal, a distributed base station solution is proposed. The solution uses radio remote technology to separate the Radio Remote Unit (RRU) from the Building Base Band Unit (BBU), which are connected by fiber or cable. The in-phase/quadrature (I/Q) data of the digital sample quantization is transmitted between the BBU and the RRU through a Common Public Radio Interface (CPRI).

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

The current 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), powerful TCM (Tandem Connection Monitoring) capability and The external FEC (Forward Error Correction) capability enables flexible scheduling and management of large-capacity services. As shown in FIG. 1, the OTN frame is a modular structure of 4080 columns x 4 rows. The frame alignment byte FAS (Frame Alignment Signal) provides a frame synchronization positioning function. The OTUk (Optical Channel Transport Unit k) OH is an optical channel transmission unit overhead byte and provides network management functions at the optical channel transmission unit level. ODUk (Optical Channel Data Unit k) OH is the optical channel data unit overhead byte, providing maintenance and operation functions. OPUk (Optical Channel Payload Unit k) is the optical channel payload unit overhead byte, which provides the function of client signal adaptation. OPUk is an optical channel payload unit that provides the function of customer signal bearing. FEC is a forward error correction byte that provides error detection and error correction. The coefficient k represents the supported bit rate and different kinds of OPUk, ODUk and OTUk. k=1 indicates that the bit rate level is 2.5 Gbit/s, k=2 indicates that the bit rate level is 10 Gbit/s, k=3 indicates that the bit rate level is 40 Gbit/s, and k=4 indicates that the bit rate level is 100 Gbit/s, k =flex indicates that the bit rate is arbitrary.

In the prior art, using a 10G bandwidth to transmit multiple CPRI signals of the same rate, it is possible to provide 6 channels of CPRI on OTU2r (OTU2r is an overclocked OTU2 rate, OTU2r rate has an FEC of 12.639 Gbit/s, and OTU2 is 10.709 Gbit/s). Option 3, or 3-way CPRI option 4, or 3-way CPRI option 5, etc. The received CPRI signal is subjected to 8B/10B decoding processing, and then mapped to a corresponding time slot by a BMP (Bit-Synchronous Mapping Procedure), and the OPU2r divides the time slot in units of bytes, and correspondingly The slot overhead location adds mapping overhead information. The AxC (Antenna-Carrier, AxC) container carrying I/Q data in the CPRI basic frame is statically configured, and the point-to-point fixed rate, even if there is idle padding in the CPRI frame, or there is slot fragmentation, the CPRI interface is still in accordance with the peak load and Run at the rate corresponding to full carrier operation. With the rapid increase of traffic, the rate of the CPRI interface is also getting higher and higher, and there may be more and more free areas in the CPRI frame. In this case, when the OTN bearer network carries the CPRI signal, regardless of how many valid AxC containers are carried on the CPRI basic frame, the OTN bearer network has to transmit the entire CPRI basic frame, resulting in wasted bandwidth.

Summary of the invention

In view of this, the embodiments of the present invention provide a method and a device for transmitting a public radio interface signal, which can solve the problem that bandwidth is wasted in the OTN-bearing CPRI signal.

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

The transmitting device maps the valid AxC container in the CPRI signal to the virtual basic frame according to the AxC container configuration information, thereby improving the utilization of the OTN transmission bandwidth.

In conjunction with the implementation of the first aspect, in a first possible implementation manner of the first aspect, the indication information of the valid AxC container includes: a column width of the valid AxC container, a starting column position of the valid AxC container, and a valid AxC container The total number of columns in the length.

Optionally, the indication information of the valid AxC container is used to identify the valid AxC container in the CPRI signal, and may further include an indication identifier, for example, identifying 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 the invalid AxC container.

According to the indication information of the valid AxC container, the effective AxC in the CPRI signal can be extracted, which can improve the utilization 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 the 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 a second aspect, an embodiment of the present invention provides a method for receiving a CPRI signal of a public radio interface, where the method includes: receiving, by an optical device, an optical channel transmission unit OTU, de-mapping the OTU, and obtaining 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.

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

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

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 optical transport network OTN device, where the OTN device includes: an acquiring module, configured to acquire a CPRI signal, and acquire an antenna carrier AxC container configuration information of the CPRI signal, where the AxC The container configuration information includes indication information of the valid AxC container; the mapping module is configured to map the valid AxC container in the CPRI signal into the virtual basic frame according to the AxC container configuration information; the mapping module is configured to: The virtual basic frame is mapped into the optical channel data unit ODU, and the ODU is mapped to the optical channel transmission unit OTU, and the transmitting module is configured to send the OTU into the optical transmission channel.

In conjunction with the implementation of the third aspect, in a first possible implementation manner of the third aspect, the indication information of the valid AxC container includes: a column width of the valid AxC container, a starting column position of the valid AxC container, and a valid AxC container The total number of columns in the length.

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; and a demapping module, configured to demap the OTU Obtaining an optical channel data unit ODU; demaping the ODU to obtain a virtual basic frame; demultiplexing an effective antenna carrier AxC container of the CPRI signal from the virtual basic frame, and configuring an AxC container according to the CPRI signal The valid AxC container of the CPRI signal is restored to the CPRI signal, the AxC container configuration information including indication information of a valid AxC container.

In conjunction with the implementation of the fourth aspect, in a first possible implementation manner of the fourth aspect, the indication information of the valid AxC container includes: a column width of the valid AxC container, a starting column position of the valid AxC container, and a valid AxC container The total number of columns in the length.

With reference to the fourth aspect, or the first possible implementation manner of the fourth aspect, in the 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 a fifth aspect, an embodiment of the present invention provides an OTN system, including: a sending device and a receiving device, where the sending device is configured to acquire a CPRI signal, and obtain an antenna carrier AxC container configuration information of the CPRI signal, where the AxC container is configured. The information includes indication information of the valid AxC container; mapping the valid AxC container of the CPRI signal into the virtual basic frame according to the AxC container configuration information; mapping the virtual basic frame to the optical channel data unit ODU, The ODU is mapped into the optical channel transport unit OTU, and the OTU is sent to the optical transport channel. Receiving, by the receiving device, an optical channel transmission unit (OTU) from the optical transmission channel, de-mapping the OTU, and obtaining an optical channel data unit ODU; de-mapping the ODU to obtain a virtual basic frame; and obtaining the virtual basic frame from the virtual basic frame The medium antenna maps the effective antenna carrier AxC container of the CPRI signal, and restores the valid 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 a valid AxC The indication of the container.

In a sixth aspect, an embodiment of the present invention provides an OTN device, including: a main control board, a tributary board, a cross board, and a circuit board, where the main control board executes pre-configured program codes, and controls the tributary board, the cross board, and the line Any one or more of the boards perform the method of any one of the first aspect and the first aspect.

According to a seventh aspect, an embodiment of the present invention provides an OTN device, including: a main control board, a tributary board, a cross board, and a circuit board, where the main control board executes pre-configured program codes, and controls the tributary board, the cross board, and the line Any one or more of the boards may perform the method of any one of the second aspect and the second aspect.

The technical solution provided by the embodiment of the present invention can be applied to an application scenario of a front end backhaul of a CPRI signal. The device will valid AxC based on the AxC container configuration information of the CPRI signal. The container is mapped into the virtual basic frame, which improves the utilization of the OTN transmission bandwidth.

DRAWINGS

A brief description of the drawings used in describing the background art and the embodiments will be briefly described below.

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

2 is a schematic structural diagram of a network architecture according to an embodiment of the present invention;

3 is a schematic diagram of a method for processing an OTN-bearing CPRI signal in the prior art;

4 is a schematic structural diagram of a CPRI data frame according to an embodiment of the present invention;

FIG. 5 is an exemplary flowchart of a method for transmitting a CPRI signal according to an embodiment of the present invention; FIG.

6 is a schematic diagram of a frame format of a CPRI signal according to an embodiment of the present invention;

FIG. 7 is a schematic structural diagram of a virtual basic frame according to an embodiment of the present disclosure;

FIG. 8 is a schematic structural diagram of a virtual basic frame according to an embodiment of the present disclosure;

FIG. 9 is a schematic diagram of a method for clock tracking according to an embodiment of the present invention;

FIG. 10 is a schematic structural diagram of a phase locked loop according to an embodiment of the present disclosure;

11 is a schematic diagram of a CPRI signal mapping process according to an embodiment of the present invention;

FIG. 12 is a schematic diagram of a frame format of a CPRI signal according to an embodiment of the present disclosure;

FIG. 13 is a schematic structural diagram of a virtual basic frame according to an embodiment of the present disclosure;

FIG. 14 is a schematic structural diagram of a virtual basic frame according to an embodiment of the present disclosure;

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

16 is an exemplary flowchart of a method for receiving a CPRI signal according to an embodiment of the present invention;

FIG. 17 is a schematic structural diagram of a sending device according to an embodiment of the present disclosure;

FIG. 18 is a schematic structural diagram of a receiving device according to an embodiment of the present invention;

19 is a schematic structural diagram of an OTN system according to an embodiment of the present invention;

FIG. 20 is a schematic structural diagram of an OTN device according to an embodiment of the present invention.

detailed description

Embodiments of the present invention will be described below with reference to the accompanying drawings.

A method, device and system for transmitting and receiving a CPRI signal according to an embodiment of the present invention can be applied to a scenario in which a front end of a CPRI signal is transmitted back. FIG. 2 is a schematic structural diagram of a network architecture according to an embodiment of the present invention. As shown in FIG. 2, the network architecture includes a wireless device of a distributed base station, a BBU and an RRU, and an OTN device. In particular, the OTN device may comprise a transponder Tranponder and a muxponder Muxponder. BBU, RRU, and OTN devices can be uniformly controlled by the controller. Specifically, the controller may be an SDN (Software Defined Network) controller. The BBU and the RRU are connected by one or more OTN devices, and the CPRI signals transmitted between the BBU and the RRU can be carried by one or more OTN devices. For example, when the BBU is used as the transmitting 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 is used as the transmitting end, the CPRI signal sent by the RRU is received by the BBU after passing through one or more OTN devices.

3 is a schematic diagram of a processing method for carrying a CPRI signal through an OTN in the prior art. For CPRI option 1, CPRI option 2, mapped to OPU0 by means of Generic Mapping Procedure (GMP); for CPRI option 3, mapped to OPU1 by GMP; for CPRI option 4-8, by bit The way of synchronous mapping is mapped to OPUflex. Then, the multi-channel low-order OPU0, OPU1, and OPUflex are mapped to the high-order OPUk through GMP, and the ODUk and the OTUk overhead are added, and finally transmitted through the OTUk. The scheme is transparently transmitted for a bit stream, and each CPRI signal first encapsulates a low-order OPU0, OPU1 or OPUflex, and then maps and multiplexes it to a 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, there is a serious bandwidth waste.

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

Table 1

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

Table 2

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

2x491.52 (Mbps) rate CPRI basic frame structure

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

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. The mapping rules for AxC containers in CPRI basic frames are as follows: Each AxC container is sent as one 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 AxC container configuration information. Specifically, the AxC container configuration information includes valid AxC container indication information in the CPRI signal, and may include a column width of a valid AxC container in the CPRI signal, a starting column position of the valid AxC container, a total length column number of the valid AxC container, and the like. 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 superframe. The valid AxC container may be mapped into the virtual basic frame according to the valid 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 valid AxC container is mapped into the ODU and/or the OTU. Since the valid AxC container in the CPRI signal is mapped into the virtual basic frame, the OTN can perform bearer transmission on the invalid AxC container, thereby improving the utilization of the OTN transmission bandwidth.

FIG. 5 is an exemplary flowchart of a method for transmitting a CPRI signal according to an embodiment of the present invention. As shown in FIG. 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 transmitting device may be an OTN device, and the transmitting device may receive a CPRI signal from the BBU or the RRU. The frame structure of the CPRI signal may include a CPRI basic frame or a CPRI superframe. The AxC container configuration information may be pre-configured on the sending device and the receiving device, or may be configured on only one device, such as a 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 the RRU through the SDN controller, and then sent to the corresponding OTN device of the transmitting end and the receiving end.

Optionally, the indication information of the valid AxC container is used to indicate a valid AxC container in the CPRI signal, which may be location information of the valid AxC container, for example, may include the column width of the valid AxC container in the CPRI signal, the starting column of the valid AxC container. Location, total length column number of valid AxC containers, etc. Optionally, the indication information of the valid AxC container may further include an indication identifier, for example, which is identified in the cost indication corresponding to the AxC container. Valid AxC containers, which are invalid AxC containers. Optionally, the AxC container configuration information may also include location information or indication information of the invalid AxC container.

Suppose the current two CPRI signals to be carried, CPRI#0 and CPRI#1. Figure 6 shows the frame format of the CPRI #0 and CPRI #1 signals, where the rate of CPRI #0 is 1.22 Gbps and the rate of CPRI #1 is 2.45 Gbps. The AxC container configuration information of CPRI #0 includes: the column width of the valid AxC container is 8 bits, the starting column position of the valid AxC container is the 18th column, and the total length of the valid AxC container is 13 columns. The AxC container configuration information of CPRI#1 includes: the column width of the valid AxC container is 16 bits, the starting column position of the valid AxC container is the 14th column, and the total length of the valid 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 container of the two signals can be extracted according to the effective AxC container indication information of the two signals, for example, including the column width, the starting column position, and the total length column number of the valid AxC container.

Before mapping a valid AxC container of a CPRI signal to a virtual basic frame, a virtual basic frame is first constructed. Specifically, the configuration of the virtual basic frame may include the following two types:

Manner 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 the structure of the CPRI basic frame, and includes 16 words, each of which contains m bytes. Where m is related to the ODU rate carrying the CPRI signal. If 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 m can have other values as the ODU rate changes.

table 3

ODUkODUk	ODU速率ODU rate	mm
ODU1ODU1	2.498Gb/s2.498Gb/s	44
ODU2ODU2	10.037Gb/s10.037Gb/s	2020
ODU3ODU3	40.319Gb/s40.319Gb/s	8080

ODU4ODU4	104.794Gb/s104.794Gb/s	200200
ODUCnODUCn	n104.794Gb/sn104.794Gb/s	n200n200

Manner 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 CPRI signal to be carried according to the column width and the total length column of the valid AxC container in the acquired AxC container configuration information. The n value of each of the CPRI signals may be the total number of valid 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 column number. 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 CPRI #0 signal is 13 columns * 8 bits, the n value of the CPRI #1 signal is 17 columns * 16 bits, and the n values of the two signals are 13 columns * 8 bits and 17 columns * 16 bits. with.

Optionally, the virtual basic frame may be configured 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 current virtual basic frame carrying capacity, a new physical port may be added, and a new virtual basic frame may be reconstructed, that is, the m value of the virtual basic frame is increased; if each calculated If the n value of the path CPRI signal is smaller than the capacity of the current virtual basic frame, the physical port can be reduced, that is, the m value of the virtual basic frame is 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 the ODU1 is used to carry the above two CPRI signals, the structure of the virtual basic frame is as shown in FIG. 7. In FIG. 7, the m value of the virtual basic frame corresponding to the ODU1 is 4, and the first two columns of the virtual basic frame may be the control words of the virtual basic frame, and the definition of the control word of the virtual basic frame may be the same as the CPRI basic frame.

FIG. 8 is a schematic diagram showing the structure of mapping two signals of CPRI #0 and CPRI #1 to a virtual basic frame as shown in FIG. In addition to mapping the valid AxC containers of the two signals to the virtual basic frame, the control words of the two signals can also be mapped into the virtual basic frame. Specifically, in the process of mapping the valid AxC container 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 valid AxC container and the control word in the CPRI basic frame to the synchronous mapping mode. In the virtual base frame. As shown in Figure 9 It can be shown that the clock of one of the CPRI signals can be tracked as a reference clock, and the clock of the other CPRI signal is referenced by 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 of the CPRI signal to be carried is as follows: the clock signal is recovered from the line CPRI signal, and the clock signal of the recovered CPRI signal is sent to the phase locked loop. After being successfully locked, the phase locked loop is stably The clock signal of the virtual basic frame is output. 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 the same as that of the prior art, and will not be described here.

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

As shown in FIG. 11, in particular, the virtual basic frame may be mapped into the payload slot of the ODU1 by means of a BMP or a BGMP (Bit-synchronous Generic Mapping Procedure). Optionally, mapping overhead information, such as a payload type indication, may be added to the overhead of the ODU1 to indicate a mapping manner of mapping the CPRI signal to the ODU1. Specifically, the payload type indication may be a PT bit indicating that a valid AxC container of the CPRI signal is mapped into the ODU1, and the idle time slot (ie, the invalid AxC container) is not mapped into the ODU1. During the demapping of the receiving device from the ODU1, the payload type indication needs to be reported to the controller for implementing the monitoring alarm function.

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

In the embodiment of the present invention, multiple CPRI signals can also be carried through multiple physical ports. Specifically, the virtual basic frame is constructed according to the ODU rate of each physical port. In the i ODUs carrying multiple CPRI signals (i is a positive integer greater than or equal to 2), the m values of the respective ODUs are m ₁ , m ₂ , . . . , m _i , respectively, and the m values of the constructed virtual basic frames are m ₁ + m ₂ ... + m _i . As shown in FIG. 12, the CPRI signal to be carried includes three channels, CPRI #0, CPRI #1 and CPRI #4, and the frame format is similar to that of FIG. 6. The valid AxC container configuration information of CPRI #0 and CPRI #1 can be referred to step S501. The valid AxC container configuration information of CPRI#4 includes: the effective AxC container has a column width of 32 bits, the effective AxC container has a starting column position of the 24th column, and the effective AxC has a total length of 9 columns. Assuming that two ODU1s are used to carry the above three CPRI signals, the structure of the virtual basic frame is as shown in FIG. The virtual basic frame m corresponding to the two ODU1s is 8, and the first two columns of the virtual basic frame may be control words. As shown in FIG. 14, the three-way CPRI signals are mapped into the virtual basic frame, and the process is similar to the process of mapping the two CPRI signals to the virtual basic frame, and details are not described herein again.

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

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

FIG. 16 is an exemplary flowchart of a method for receiving a CPRI signal according to an embodiment of the present invention. As shown in FIG. 16, the method can be performed by an OTN device, including the following steps:

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

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

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

For example, demapping ODU1 results in a virtual basic frame. For the structure and construction process of the virtual basic frame, refer to the embodiment shown in FIG. 5, and details are not described herein again. The virtual basic frame obtained by demapping from the ODU can carry the valid AxC of the CPRI signal. container.

S603: Demap the virtual basic frame to obtain a valid AxC container of the CPRI signal, and restore the valid 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 is configured. The information includes instructions for a valid AxC container.

The AxC container configuration information includes indication information of the valid AxC container in the CPRI signal, and 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 column number of the valid AxC container, and the like. In the process of restoring a valid AxC container to a CPRI signal, it is also possible to fill the free time slot in a location other than the valid AxC container and control word in the CPRI signal. The recovered CPRI signal may include CPRI #0, CPRI #1, and the like.

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

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

The obtaining module 171 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, and a mapping module, configured to use the AxC container configuration information according to the Mapping a valid AxC container 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 transmission unit OTU;

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

Optionally, the indication information of the valid AxC container includes: a column width of the valid AxC container, a starting column position of the valid AxC container, and a total length 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 constructing module, configured to map the valid AxC container of the CPRI signal to the virtual basic frame according to the valid AxC container The virtual base frame is constructed by the column width and the total length column number.

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

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

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

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

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 padding module for filling the free time slot in an area other than the valid AxC container and the control word.

FIG. 19 is a schematic structural diagram of an OTN system according to an embodiment of the present invention. As shown in FIG. 19, the system includes a transmitting device 191 and a receiving device 192. 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; and the CPRI signal is configured according to the AxC container configuration information. Mapping the valid AxC container to the virtual basic frame; mapping the virtual basic frame to the optical channel data unit ODU, mapping the ODU to the optical channel transmission unit OTU, and transmitting the OTU to the optical transmission channel .

The receiving device 192 is configured to receive an optical channel transmission unit (OTU) from the optical transmission channel, demap the OTU, and obtain an optical channel data unit ODU; demap the ODU to obtain a virtual basic frame; Decoding the effective antenna carrier AxC container of the CPRI signal in the basic frame, and restoring the valid 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 Instructions for valid AxC containers.

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

FIG. 20 is a schematic structural diagram of an OTN device 200 according to an embodiment of the present invention. As shown in FIG. 20, the OTN device 200 includes a main control board 201, an OTN circuit board 202, a cross board 203, and an OTN circuit board 204. The direction of transmission of the service can be from the customer side to the line side, and also from the line side to the customer side. The service sent or received by the client side is called the client side service, and the service received or sent by the line side is called the wavelength division side service. The service processing flow in the two directions is a reverse process. In this embodiment, the client side to the line side direction is taken as an example for description:

The main control board 201 is connected to the OTN tributary board 202, the cross board 203, and the OTN circuit board 204 through a bus, and functions as a control and management function for the OTN tributary board 202, the cross board 203, and the OTN circuit board 204.

The OTN tributary board 202 completes the package mapping of the customer service. The customer service includes a variety of service types, such as ATM (Asynchronous Transfer Mode) service, SDH (Synchronous Digital Hierarchy) service, Ethernet business, CPRI business, storage business, etc. Specifically, the tributary board 202 is configured to receive the client service from the client side, map the received client service package to an ODU (Optical Channel Data Unit) signal, and add a corresponding OTN management 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 an ODU overhead. Different types of customer services are packaged into different ODU signals in different ways.

The cross board 203 completes the full cross connection of the tributary board and the circuit board to realize flexible cross scheduling of the ODU signal. Specifically, the cross board can realize the transmission of the ODU signal from any one of the tributary boards to any one of the circuit boards, or the OTU signal can be transmitted from any one of the circuit boards to any one of the circuit boards, and the customer signal can be transmitted from any one of the tributary boards. Transfer to any of the tributary boards.

The OTN circuit board 204 forms an OTU (Optical Channel Transport Unit) signal and transmits it to the line side. The OTN circuit board 204 can multiplex the low order multiplexed ODU signals into the high order ODU signals before the ODU signals form the OTU signals. Then, the high-order ODU signal adds the corresponding OTN management monitoring overhead to form an OTU signal and transmits it to the optical transmission channel on the line side. On the OTN board, the high-order ODU signal can be ODU1, ODU2, ODU3, ODU4, etc. The OTN management monitoring overhead can be OTU overhead.

The main control board 201 can execute a pre-configured program code, and control any one or more of the OTN tributary board 202, the cross board 203, and the OTN circuit board 204 to perform the following functions: acquiring a CPRI signal, and acquiring the Antenna carrier AxC container configuration information of the CPRI signal, the AxC container configuration information includes indication information of the valid AxC container; mapping the valid AxC container in the CPRI signal to the virtual basic frame according to the AxC container configuration information; The virtual basic frame is mapped into the optical channel data unit ODU, and the ODU is mapped into the optical channel transmission unit OTU, and the OTU is sent to the optical transmission channel.

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

Those of ordinary skill in the art will appreciate that various aspects of the present invention, or possible implementations of various aspects, may be embodied as a system, method, or computer program product. Thus, aspects of the invention, or possible implementations of various aspects, may be in the form of an entirely hardware embodiment, an entirely software embodiment (including firmware, resident software, etc.), or a combination of software and hardware aspects, They are collectively referred to herein as "circuits," "modules," or "systems." Furthermore, aspects of the invention, or possible implementations of various aspects, may take the form of a computer program product, which is a computer readable program code stored in a computer readable medium.

The above is only a few embodiments of the present invention, and various modifications and changes may be made thereto without departing from the spirit and scope of the invention.

Claims

A method for transmitting a CPRI signal of a public radio interface, the method comprising:

The sending device acquires the CPRI signal, and acquires antenna carrier AxC container configuration information of the CPRI signal, where the AxC container configuration information includes indication information of a valid AxC container;

Mapping a valid AxC container of the CPRI signal into a virtual basic frame according to the AxC container configuration information;

Mapping the virtual basic frame to the optical channel data unit ODU, mapping the ODU into the optical channel transmission unit OTU, and transmitting the OTU to the optical transmission channel.
The method of claim 1 wherein the indication information of the valid AxC container comprises:

The column width of the valid AxC container, the starting column position of the valid AxC container, and the total length column of the valid AxC container.
The method of claim 1, wherein the frame structure of the virtual basic frame is the same as the frame structure of the CPRI basic frame.
The method of claim 1, wherein before mapping the valid AxC container of the CPRI signal to the virtual basic frame, the method further comprises:

The virtual basic frame is constructed according to the column width and the total length column number of the valid AxC container.
The method of claim 1 wherein the method further comprises:

A control word of the CPRI signal is mapped into the virtual basic frame.
The method according to any one of claims 1-5, wherein there is a one-to-one correspondence between the number of bytes included in each word in the virtual basic frame and the rate of the ODU signal.
An optical transport network OTN device, characterized in that the OTN device comprises:

An acquiring module, configured to acquire a common radio interface CPRI signal, and obtain antenna carrier AxC container configuration information of the CPRI signal, where the AxC container configuration information includes indication information of a valid AxC container;

a mapping module, configured to map a valid AxC container of the CPRI signal into a virtual basic frame according to the AxC container configuration information;

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

And a sending module, configured to send the OTU into the optical transmission channel.
The OTN device of claim 7, wherein the indication information of the valid AxC container comprises:

The column width of the valid AxC container, the starting column position of the valid AxC container, and the total length column of the valid AxC container.
The OTN device according to claim 7, wherein the frame structure of the virtual basic frame is the same as the frame structure of the CPRI basic frame.
The OTN device of claim 7, wherein the OTN device further comprises a construction module,

The constructing module configured to construct the valid AxC container of the CPRI signal according to the column width and the total length column number of the valid AxC container before mapping the valid AxC container of the CPRI signal into the virtual basic frame Virtual basic frame.
The OTN device according to claim 7, wherein the mapping module is further configured to:

A control word of the CPRI signal is mapped into the virtual basic frame.
The OTN device according to any one of claims 7-11, wherein there is a one-to-one correspondence between the number of bytes included in each word in the virtual basic frame and the rate of the ODU signal.