CN108959143B

CN108959143B - Optical transmission network equipment and service processing method

Info

Publication number: CN108959143B
Application number: CN201710363500.5A
Authority: CN
Inventors: 胡大江
Original assignee: ZTE Corp
Current assignee: Wuhan Zhongxing Software Co ltd
Priority date: 2017-05-22
Filing date: 2017-05-22
Publication date: 2023-06-27
Anticipated expiration: 2037-05-22
Also published as: CN108959143A

Abstract

The embodiment of the invention discloses an optical transmission network device and a service processing method. An Optical Transport Network (OTN) device in an embodiment of the present invention includes: a plurality of first-in first-out (FIFO) queue modules and a FIFO monitoring and adjusting module respectively connected with each FIFO module; the FIFO monitoring and adjusting module is used for monitoring the water level monitoring value of each FIFO module in the OTN equipment and sending a water level adjusting instruction to the corresponding FIFO module according to the monitoring result; and the FIFO module is used for carrying out water level adjustment on the FIFO module according to the water level adjustment instruction received from the FIFO monitoring and adjusting module. The embodiment of the invention can meet the performance requirements of CPRI interface service on low delay, stable delay and symmetrical delay in the scene of adopting OTN equipment to bear wireless forward transmission in C-RAN network.

Description

Optical transmission network equipment and service processing method

Technical Field

The present invention relates to the field of optical transport network (Optical Transport Network, abbreviated as OTN) communications technologies, and in particular, to an optical transport network device and a service processing method.

Background

With the development of wireless communication services in the fifth generation mobile communication technology (5 th-Generation Mobile Communication, abbreviated as: 5G), the application requirement of the OTN device carrying the centralized radio access network (Central Radio Access Network, abbreviated as: C-RAN) is getting stronger.

The mode of carrying the C-RAN network traffic by the OTN device is a wireless forwarding (Fronthaul) bearer, that is, a connection between a novel network architecture formed by a centralized baseband controller (Building Baseband Unit, abbreviated as BBU) and a remote radio unit (Remote Radio Unit, abbreviated as RRH), and it is seen that the wireless forwarding is one of the elements of the networking model for implementing the distributed base station, that is, the C-RAN network. The traditional C-RAN network adopts a mode of directly connecting BBU and RRH by optical fibers, the bandwidth of the optical fibers is low (usually 4G to 7G), and the transmission distance is short; in order to meet the demands of higher coverage density and faster data transmission of a wireless communication network and meet the demands of reducing the construction cost, power consumption, maintenance cost and the like of a C-RAN network, OTN equipment is proposed to replace wireless forwarding in the optical fiber bearing C-RAN network. In addition, the OTN equipment bears the scheme of wireless forwarding, so that the C-RAN network is attractive, and a brand new opportunity is brought to optical communication.

An important interface is involved in the wireless forwarding bearer, namely a general wireless interface (Common Public Radio Interface, abbreviated as CPRI), which is an interface between a baseband controller (BBU) and a Remote Radio Unit (RRU), and the CPRI interface protocol has high requirements on performance of low latency, stable latency and symmetric latency. Therefore, in the scenario of carrying wireless forwarding by adopting the OTN device, how to improve the performance requirements of the CPRI interface service on low latency, stable latency and symmetric latency is a problem to be solved at present.

Disclosure of Invention

In order to solve the technical problems, the embodiments of the present invention provide an optical transport network device and a service processing method, so as to meet performance requirements of a CPRI interface service on low latency, stable latency and symmetric latency in a scenario of adopting an OTN device to carry wireless forwarding in a C-RAN network.

In a first aspect, an embodiment of the present invention provides an optical transport network device, including: the system comprises a plurality of first-in first-out queue FIFO modules and FIFO monitoring and adjusting modules respectively connected with each FIFO module;

the FIFO monitoring and adjusting module is used for monitoring the water level monitoring value of each FIFO module in the OTN equipment and sending a water level adjusting instruction to the corresponding FIFO module according to the monitoring result;

and the FIFO module is used for carrying out water level adjustment on the FIFO module according to the water level adjustment instruction received from the FIFO monitoring and adjusting module.

In a first possible implementation manner of the first aspect, the FIFO module includes: a state control unit and a FIFO unit;

the state control unit is used for receiving the water level regulating instruction sent by the FIFO monitoring and regulating module and sending the water level regulating instruction to the FIFO unit;

The FIFO unit is used for carrying out water level adjustment on the FIFO unit according to the write request signal or the read request signal and the received water level adjustment instruction.

In a first possible implementation manner of the first aspect, in a second possible implementation manner, the FIFO module further includes a first logic gate and a second logic gate, the water level adjustment instruction is used to indicate an adjustment direction and an adjustment number, the water level adjustment instruction and the write request signal are connected to an input terminal of the first logic gate, the water level adjustment instruction and the read request signal are connected to an input terminal of the second logic gate, an output terminal of the first logic gate and an output terminal of the second logic gate are respectively connected to the FIFO unit, and the write request signal and the read request signal are respectively connected to the state control unit;

the state control unit is further configured to send an adjustment response signal to the FIFO monitoring adjustment module after receiving the water level adjustment instruction, and when receiving the write request signal, transmit a first water level adjustment signal to the FIFO unit through the output terminal of the first logic gate, and when receiving the read request signal, transmit a second water level adjustment signal to the FIFO unit through the output terminal of the second logic gate;

The FIFO unit carries out water level adjustment on the FIFO unit and comprises the following steps:

according to the first water level adjusting signal or the second water level adjusting signal and the indication adjusting direction and the adjusting times indicated by the water level adjusting instruction, the water level of the FIFO unit is adjusted downwards or upwards by corresponding times;

the state control unit is further configured to cancel the adjustment response signal after the FIFO unit completes the water level adjustment.

In a third possible implementation manner of the first aspect, the FIFO monitoring and adjusting module includes:

the measuring unit is used for periodically measuring the highest water level value and the lowest water level value of each FIFO module in the OTN equipment;

the monitoring unit is used for monitoring the difference value between the highest water level value and the lowest water level value of each FIFO module in a preset number of periods;

and the adjusting unit is used for sending a water level adjusting instruction to the corresponding FIFO module when the difference value of the difference between the highest water level value and the lowest water level value of each FIFO module is smaller than or equal to the preset water level difference value.

According to a third possible implementation manner of the first aspect, in a fourth possible implementation manner, a preset minimum water level value is set in the OTN device, and the FIFO module performs water level adjustment on the FIFO module, including:

And according to the highest water level value and the lowest water level value of the FIFO module, which are measured by the FIFO monitoring and adjusting module, and the preset lowest water level value and the water level adjusting instruction, adjusting the lowest water level value of the FIFO module to be equal to the preset lowest water level value.

In a fifth possible implementation manner according to the third or fourth possible implementation manner of the first aspect, the OTN device is provided with a preset maximum water level value, and the OTN device further includes: the time delay compensation module is respectively connected with the FIFO monitoring and adjusting module and each FIFO module;

the time delay compensation module is used for sending a first time delay compensation instruction to the corresponding FIFO module according to the preset highest water level value and the lowest water level value of each FIFO module measured by the FIFO monitoring and adjusting module;

the FIFO module is further configured to adjust a highest water level value of the FIFO module to be equal to the preset highest water level value according to the first delay compensation instruction sent by the delay compensation module.

In a sixth possible implementation manner according to the third or fourth possible implementation manner of the first aspect, the OTN device further includes: the time delay transmission module is connected with the FIFO monitoring and adjusting module, and the time delay compensation module is respectively connected with the FIFO monitoring and adjusting module and each FIFO module, and is also connected with the opposite-end OTN equipment;

The time delay transmission module is used for transmitting the highest water level value of each FIFO module in the OTN equipment, which is measured by the FIFO monitoring and adjusting module, to the opposite-end OTN equipment and receiving the highest water level value of each FIFO module in the opposite-end OTN equipment, which is transmitted by the opposite-end OTN equipment;

the delay compensation module is used for comparing the highest water level value of each FIFO module in the OTN equipment with the highest water level value of the corresponding FIFO module in the opposite end OTN equipment, and sending a second delay compensation instruction to the corresponding FIFO module according to the comparison result;

and the FIFO module is also used for adjusting the highest water level value of the FIFO module to be equal to the highest water level value of the corresponding FIFO module according to the second delay compensation instruction sent by the delay compensation module.

In a second aspect, an embodiment of the present invention provides a service processing method, including:

monitoring a water level monitoring value of each first-in first-out queue FIFO module in the OTN equipment;

and adjusting the water level of the corresponding FIFO module according to the water level monitoring value of each FIFO module.

In a first possible implementation manner of the second aspect, the performing water level adjustment on the corresponding FIFO module according to the water level monitoring value of each FIFO module includes:

According to the water level monitoring value of each FIFO module, a water level adjusting instruction is sent to the corresponding FIFO module;

and the FIFO module carries out water level adjustment on the FIFO module according to the write request signal or the read request signal and the received water level adjustment instruction.

According to a first possible implementation manner of the third aspect, in a second possible implementation manner, the water level adjustment instruction is used to instruct an adjustment direction and an adjustment number, and before the FIFO module performs water level adjustment on the FIFO module, the method further includes:

the FIFO module sends out an adjustment response signal;

the FIFO module carries out water level adjustment on the FIFO module and comprises:

and when the FIFO module receives the write request signal or the read request signal, the FIFO module downwards or upwards adjusts the water level of the FIFO module by corresponding times according to the adjusting direction and the adjusting times in the water level adjusting instruction, and cancels the adjusting response signal after the water level adjustment is finished.

In a third possible implementation manner of the second aspect, the monitoring a water level monitoring value of each FIFO module in the OTN device includes:

periodically measuring the highest water level value and the lowest water level value of each FIFO module in the OTN equipment;

Monitoring the difference value between the highest water level value and the lowest water level value of each FIFO module in a preset number of periods;

and when the difference value of the difference between the highest water level value and the lowest water level value of each FIFO module is smaller than or equal to the preset water level difference value, determining to adjust the water level of the corresponding FIFO module.

According to a third possible implementation manner of the second aspect, in a fourth possible implementation manner, a preset minimum water level value is set in the OTN device, and the performing water level adjustment on the corresponding FIFO module includes:

and regulating the lowest water level value of the FIFO module to be equal to the preset lowest water level value according to the highest water level value, the lowest water level value and the preset lowest water level value of the FIFO module.

In a fifth possible implementation manner according to the third or fourth possible implementation manner of the second aspect, the OTN device is provided with a preset maximum water level value, and the method further includes:

and adjusting the highest water level value of the FIFO module to be equal to the preset highest water level value according to the preset highest water level value and the lowest water level value of the FIFO module.

According to a third or fourth possible implementation manner of the second aspect, in a sixth possible implementation manner, the method further includes:

Transmitting the highest water level value of each FIFO module in the OTN equipment to opposite-end OTN equipment, and receiving the highest water level value of each FIFO module in the opposite-end OTN equipment transmitted by the opposite-end OTN equipment;

comparing the highest water level value of each FIFO module in the OTN equipment with the highest water level value of the corresponding FIFO module in the opposite end OTN equipment, and adjusting the highest water level value of the FIFO module in the OTN equipment to be equal to the highest water level value of the corresponding FIFO module according to the comparison result.

According to the optical transmission network device and the service processing method provided by the embodiment of the invention, the water level monitoring value of each FIFO module connected with the FIFO monitoring and adjusting module in the OTN device is monitored by the FIFO monitoring and adjusting module, a water level adjusting instruction is sent to the corresponding FIFO module according to the monitoring result, and then the FIFO module can adjust the water level of the FIFO module according to the water level adjusting instruction received from the FIFO monitoring and adjusting module; in the OTN device provided by the embodiment of the present invention, the above water level monitoring value may reflect whether the corresponding FIFO module satisfies the condition for performing water level adjustment, that is, when the water level monitoring value of a certain FIFO module satisfies the preset monitoring condition, the FIFO module may be instructed to perform water level adjustment, so as to meet the performance requirement of the CPRI interface service on low latency and stable latency in a scenario of using the OTN device to carry out wireless forwarding in the C-RAN network.

Drawings

The accompanying drawings are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate and do not limit the invention.

Fig. 1 is a schematic diagram of an application scenario in which OTN devices in a C-RAN network carry CPRI services;

fig. 2 is a schematic structural diagram of an OTN device according to an embodiment of the present invention;

fig. 3 is a schematic diagram of an operation principle of an OTN device according to an embodiment of the present invention;

fig. 4 is a schematic water level diagram of a FIFO module in an OTN device according to an embodiment of the present invention;

fig. 5 is a schematic structural diagram of a FIFO module in an OTN device according to an embodiment of the present invention;

fig. 6 is a schematic structural diagram of another OTN device according to an embodiment of the present invention;

fig. 7 is a schematic structural diagram of still another OTN device according to an embodiment of the present invention;

fig. 8 is a schematic structural diagram of still another OTN device according to an embodiment of the present invention;

fig. 9 is a schematic diagram of an application scenario in which an OTN device provided in an embodiment of the present invention carries CPRI interface services;

fig. 10 is a flowchart of water level adjustment performed by an OTN device according to an embodiment of the present invention;

fig. 11 is a flowchart of a service processing method according to an embodiment of the present invention;

Fig. 12 is a flowchart of another service processing method according to an embodiment of the present invention;

fig. 13 is a flowchart of another service processing method according to an embodiment of the present invention;

fig. 14 is a flowchart of yet another service processing method according to an embodiment of the present invention;

fig. 15 is a flowchart of another service processing method according to an embodiment of the present invention;

fig. 16 is a flowchart of performing delay compensation in a service processing method according to an embodiment of the present invention.

Detailed Description

For the purpose of making the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be described in detail hereinafter with reference to the accompanying drawings. It should be noted that, in the case of no conflict, the embodiments and features in the embodiments may be arbitrarily combined with each other.

The steps illustrated in the flowchart of the figures may be performed in a computer system, such as a set of computer-executable instructions. Also, while a logical order is depicted in the flowchart, in some cases, the steps depicted or described may be performed in a different order than presented herein.

Before describing the OTN device and the service processing method provided by the embodiments of the present invention, an application scenario of the OTN device carrying the CPRI service in the C-RAN network is first introduced simply, and the OTN device implements the carrying of the CPRI service, as shown in fig. 1, which is a schematic diagram of the application scenario of the OTN device carrying the CPRI service in the C-RAN network. In the network architecture of the distributed base station, the RRU is separated from the BBU and communicates through the CPRI interface, and the OTN is adopted to set the service carrying the CPRI interface, so that the wireless communication network can be more densely covered and the data transmission is faster.

However, CPRI interface services have high requirements on latency performance, and generally include: low delay, stable delay, symmetrical delay, etc. The carrying method of the OTN equipment in the prior art is difficult to meet the time delay requirement of CPRI interface service. Therefore, in the scenario of carrying wireless forwarding by adopting the OTN device, how to improve the performance requirements of the CPRI interface service on low latency, stable latency and symmetric latency is a problem to be solved at present.

The technical scheme of the present invention is described in detail by specific embodiments, and the OTN device in each of the following embodiments of the present invention is used to carry wireless forwarding in a C-RAN network and carry CPRI interface service in a wireless forwarding networking scenario. The following specific embodiments may be combined with each other, and some embodiments may not be repeated for the same or similar concepts or processes.

Fig. 2 is a schematic structural diagram of an OTN device according to an embodiment of the present invention. The OTN device provided in this embodiment is applicable to a case of carrying wireless forwarding in a C-RAN network, and is implemented by combining hardware and software. As shown in fig. 2, the OTN device 10 provided in the embodiment of the present invention may include: a plurality of first-in first-out queues (First Input First Output, abbreviated as FIFO) modules 110, and a FIFO monitoring and adjusting module 120 respectively connected to each of the FIFO modules 110.

The FIFO monitoring and adjusting module 120 is configured to monitor a water level monitoring value of each FIFO module 110 in the OTN device 10, and send a water level adjusting instruction to the corresponding FIFO module 110 according to a monitoring result.

The OTN device provided by the embodiment of the present invention is a device for carrying wireless forwarding in a C-RAN network, where the device may carry a service in the C-RAN network, for example, a service carried by the OTN device is, for example, a CPRI interface service. The OTN device of the embodiment of the present invention generally has a plurality of FIFO modules, which are configured to receive the service data stream transferred from the previous FIFO module (or the opposite OTN device) and transfer the service data stream to the next FIFO module (or the opposite OTN device). As shown in fig. 3, which is a schematic diagram of an operation principle of the OTN device provided by the embodiment of the present invention, it can be seen with reference to fig. 1 and fig. 3 that a CPRI interface service between a BBU and an RRU is carried by the OTN device, and data interaction can be performed between two OTN devices 1 and 2, and data transmission inside each OTN device has directionality, i.e., an a direction and a B direction, and fig. 3 includes 3 FIFO modules (i.e., FIFO module A1, FIFO module A2, FIFO module A3) in the a direction, and includes 3 FIFO modules (i.e., FIFO module B1, FIFO module B2, FIFO module B3) in the B direction as an example. For the OTN device 1, in the a direction, the FIFO module A1 receives the service at the client side, and sends the service to the line side of the opposite OTN device (i.e., the OTN device 2 in fig. 3) at the line side through the FIFO module A3; in the direction B, the FIFO module B3 receives the service sent by the OTN device at the opposite end on the line side, and sends the service out on the client side through the FIFO module B1.

In the embodiment of the invention, the working principle of the FIFO module is the reading/writing operation of service data, namely, the data written by the FIFO module firstly reads out the data in the process of service transmission, when the writing operation is executed, the water level of the FIFO module rises, and when the reading operation is executed, the water level of the FIFO module falls, so that the water level of the FIFO module is related to the reading operation and the writing operation, namely, the reading/writing operation rate influences the highest water level value and the lowest water level value of the FIFO module. The FIFO monitoring and adjusting module in the embodiment of the invention can monitor the water level monitoring value of each FIFO module in the OTN equipment, wherein the water level monitoring value can be determined by a designer according to the performance requirements of the FIFO module, and comprises a highest water level value, a lowest water level value and the difference between the highest water level value and the lowest water level value; when the FIFO monitoring and adjusting module monitors that the water level monitoring value of a certain FIFO module meets the preset condition, the FIFO module is considered to be capable of being subjected to water level adjustment, and a water level adjusting instruction is sent to the FIFO module.

It should be noted that, because signals of the BBU and the RRU are carried by the OTN device, it is required that the time delays of the OTN device in the two directions are consistent. The water level of the FIFO module in the embodiment of the invention represents the time delay, namely the time delay of the OTN equipment can be adjusted by adjusting the water level of the FIFO module.

The FIFO module 110 is configured to perform water level adjustment on the FIFO module 110 according to the water level adjustment instruction received from the FIFO monitoring adjustment module 120.

The FIFO module in the embodiment of the invention has a function of adjusting the water level, and the water level of the common FIFO module in the prior art is generally determined by the rate of read/write operation, and the water level of the FIFO module cannot be flexibly adjusted. In the embodiment of the invention, when any one FIFO module in the OTN equipment receives the water level adjustment instruction sent by the FIFO monitoring adjustment module, the FIFO module is indicated to meet the condition of water level adjustment, and the water level adjustment can be performed according to the mode indicated by the water level adjustment instruction.

In the scenario of carrying wireless forwarding by the OTN device provided by the embodiment of the invention, the requirement of CPRI interface service on time delay performance needs to be met, and the CPRI interface service has higher requirements on low time delay and stable time delay. The level of the water level value of the FIFO module indicates how much data is stored in the FIFO module, and because clocks of different FIFO modules may be inconsistent and the amount of buffered data is different, it is necessary to perform water level adjustment on each FIFO module in the OTN device after monitoring the water level monitoring value of the FIFO module. As shown in fig. 4, a schematic water level diagram of a FIFO module in an OTN device according to an embodiment of the present invention is shown, in a read-write process of the FIFO module 110, there is a maximum water level value (max_level) and a minimum water level value (min_level), where the smaller the min_level is, the better the requirement of low latency is met, but the smaller the min_level is, the performance of resisting clock variation decreases, and because the stability of CPRI interface service itself is better, when the water level of the FIFO module is adjusted, the min_level may be adjusted to a relatively smaller value, for example, a Preset minimum water level value (Preset-Min-level) may be set in the OTN device, and in addition, the water level adjustment instruction sent by the FIFO monitoring adjustment module may be an instruction for adjusting the water level of the FIFO module according to the monitored water level monitoring value in combination with the Preset-Min-level, after the water level monitoring value of the FIFO module is stable, the water level of the FIFO module is adjusted by referring to the Preset-Min-level, thereby meeting the requirement of low latency and stable CPRI for the FIFO module.

According to the OTN equipment provided by the embodiment of the invention, the water level monitoring value of each FIFO module connected with the FIFO monitoring and adjusting module in the OTN equipment is monitored by the FIFO monitoring and adjusting module, a water level adjusting instruction is sent to the corresponding FIFO module according to the monitoring result, and then the FIFO module can adjust the water level of the FIFO module according to the water level adjusting instruction received from the FIFO monitoring and adjusting module; in the OTN device provided by the embodiment of the present invention, the above water level monitoring value may reflect whether the corresponding FIFO module satisfies the condition for performing water level adjustment, that is, when the water level monitoring value of a certain FIFO module satisfies the preset monitoring condition, the FIFO module may be instructed to perform water level adjustment, so as to meet the performance requirement of the CPRI interface service on low latency and stable latency in a scenario of using the OTN device to carry out wireless forwarding in the C-RAN network.

Optionally, fig. 5 is a schematic structural diagram of a FIFO module in the OTN device according to the embodiment of the present invention. The FIFO module 110 in the embodiment of the invention may include: a state control unit 111 and a FIFO unit 112.

The status control unit 111 is configured to receive a water level adjustment instruction sent by the FIFO monitoring and adjusting module 120, and send the water level adjustment instruction to the FIFO unit 112;

The FIFO unit 112 is configured to perform a water level adjustment on the FIFO unit 112 according to the write request signal or the read request signal and the received water level adjustment instruction.

Compared with the common FIFO module in the prior art, the FIFO module in the embodiment of the invention is added with a state control unit, for example, a water level control state machine (Finite StateMachine, FSM for short), namely (Level Control FSM), and the state control unit can receive the water level adjustment instruction from the FIFO monitoring and adjusting module and transmit the instruction to the FIFO unit; in addition, the FIFO unit can receive an external write request signal or read request signal, and when the FIFO unit receives the write request signal or the read request signal, the FIFO unit is combined with a water level adjustment instruction to perform water level adjustment.

Further, in the embodiment of the present invention, the FIFO module 110 further includes a first logic gate 113 and a second logic gate 114, the water level adjustment instruction is used to indicate the adjustment direction and the adjustment times, the OTN device further includes a first logic gate and a second logic gate, the water level adjustment instruction and the write request signal are connected to the input terminal of the first logic gate 113, the water level adjustment instruction and the read request signal are connected to the input terminal of the second logic gate 114, the output terminal of the first logic gate 113 and the output terminal of the second logic gate 114 are respectively connected to the FIFO unit 112, and the write request signal and the read request signal are respectively connected to the state control unit 111. The FIFO monitor adjustment module 120 in an embodiment of the invention may send a water level adjustment command, which may be, for example, { DOWN, N, REQ }, in the form of a command to the state control unit by means of an UP/DOWN/REQ/NUM signal, indicating a request to adjust the water level of the FIFO module DOWN N times.

The state control unit 111 is further configured to send an adjustment response signal to the FIFO monitor adjustment module 120 after receiving the water level adjustment command, and to transmit a first water level adjustment signal to the FIFO unit 112 through an output terminal of the first logic gate 113 when receiving the write request signal, and to transmit a second water level adjustment signal to the FIFO unit 112 through an output terminal of the second logic gate 114 when receiving the read request signal.

The implementation manner of the FIFO unit 112 to perform the water level adjustment on the FIFO unit 112 in the embodiment of the present invention may include: the water level of the FIFO unit 112 is adjusted downward or upward by a corresponding number of times according to the first water level adjustment signal or the second water level adjustment signal, and the indicated adjustment direction and the adjustment number indicated by the water level adjustment instruction.

The state control unit 111 is further configured to cancel the adjustment response signal after the FIFO unit 113 completes the water level adjustment.

In the embodiment of the invention, the state control unit interferes the write request/read request signal to realize water level adjustment, and the water level is adjusted according to the write/read time, and the FIFO module is always in a BUSY (BUSY) state in the adjustment process and does not receive a new water level adjustment instruction any more, so that after the FIFO monitoring adjustment module sends the water level adjustment instruction to the state control unit through a pin, the state control unit sends an adjustment response signal (for example, a BUSY signal) to indicate that the adjustment instruction is accepted; and, the write request/read request signal is masked by the first/second logic gate.

For example, if the water level adjustment command is { DOWN, N, REQ }, it indicates that the water level needs to be adjusted downward N times, i.e., N times of writing is rejected when the write request signal is received, i.e., N times of downward adjustment; in practical application, every time a Write-once request signal (write_req) is collected, which means that the water level of the FIFO unit is adjusted downward by one, the state becomes { DOWN, N-1, req }, and so on, knowing that N is decremented to 0, that is, the adjustment mode indicated by the water level adjustment instruction is completed, and after the water level adjustment is completed, the state control unit cancels the BUSY instruction. If the water level adjustment command is { UP, N, REQ }, it indicates that the water level needs to be adjusted upward N times, i.e. when the Read request signal (read_req) is received, the Read is refused N times, and the specific adjustment mode is the same as the adjustment mode of the write request signal, so that the description is omitted here.

Optionally, fig. 6 is a schematic structural diagram of another OTN device according to an embodiment of the present invention. Based on the structure of the OTN device shown in fig. 2, the FIFO monitoring and adjusting module 120 in this embodiment may include:

a measurement unit 121 for periodically measuring the highest water level value and the lowest water level value of each FIFO module 110 in the OTN device;

a monitoring unit 122 for monitoring a difference value between a highest water level value and a lowest water level value of each FIFO module 110 within a preset number of periods;

And the adjusting unit 123 is configured to send a water level adjusting instruction to the corresponding FIFO module 110 when the difference between the highest water level value and the lowest water level value of each FIFO module 110 is less than or equal to the preset water level difference.

In the embodiment of the present invention, referring to the water level schematic diagram of the FIFO module shown in fig. 4, according to the characteristics of the OTN device, the (max_level-min_level) will also be a relatively stable value along with the stability of the access service after the OTN device is powered on, especially the service with very stable rate such as the CRPI interface service, where the value (max_level-min_level) is determined by the specific service logic implementation manner and service characteristics of the OTN device. After the OTN equipment is powered on, the value is periodically monitored, and whether the value reaches a stable state or not is judged, so that a basis is provided for subsequent operation.

Optionally, in the embodiment of the present invention, the monitoring period is, for example, T, the preset number of periods is, for example, M periods T, the preset water level difference is Δ, the period T may be selected as an OTN frame period multiple, only max_level and min_level are measured in each period T, the difference between max_level and min_level in M consecutive periods T is delta (max_level-min_level), and when the difference delta (max_level-min_level) <= Δ, the water level of the FIFO module is indicated to be stable; the period T, the preset number M, and the preset water level difference Δ may be configured by a designer, for example, according to the requirements of the OTN device for time delay and the performance of the FIFO module.

Optionally, in the embodiment of the present invention, a preset minimum water level value is set in the OTN device 10, and an implementation manner of the FIFO module 110 in the OTN device 10 to perform water level adjustment on the FIFO module 110 may include:

according to the highest water level value and the lowest water level value of the FIFO module 110 and the preset lowest water level value and the water level adjustment command measured by the FIFO monitoring and adjustment module 120, the lowest water level value of the FIFO module 110 is adjusted to be equal to the preset lowest water level value, and the difference between the highest water level value and the lowest water level value is kept unchanged. It should be noted that, when the minimum water level is adjusted, the corresponding maximum water level will change accordingly, i.e. the difference between the maximum water level value and the minimum water level value is kept to be a stable value.

In the embodiment of the invention, the main variable time delay in the OTN equipment is derived from the use of the FIFO module, so that the water level adjustment performed on the FIFO module is the adjustment of the time delay in the OTN equipment. Wherein max_level represents the delay index of the service passing through the corresponding FIFO module, delta (max_level-min_level) reflects the jitter of the service clock, and min_level represents the capability of the FIFO module to resist clock jitter on the one hand and the potential of reducing the delay of the FIFO module on the other hand in combination with the availability. In practical application, how to adjust the min_level of each FIFO module to a reasonable Preset value, that is, to Preset the lowest water level value (Preset-Min-level), is important after the OTN device is powered on, and the requirement on the Preset-Min-level is that the low delay of the CPRI interface service is ensured and the stability of the service cannot be affected. According to the lowest water level value (Min_level) of the FIFO module after power-on stabilization, the FIFO monitoring and adjusting module sends out a corresponding water level adjusting instruction, and carries out first water level adjustment on the corresponding FIFO module, and the principle of carrying out water level adjustment on the FIFO module is as follows: min_level is adjusted to be equal to the Preset-Min-level, and Max_level is adjusted according to the Max_level-Min_level so that the adjusted Max_level-Min_level is equal to the pre-adjustment level. After the first water level adjustment, the min_level of each FIFO module in the OTN device already meets the Preset-Min-level requirement, and it can be expected that the states of FIFO modules of a plurality of OTN devices in the C-RAN network are substantially consistent, i.e. the requirements of low delay and stable delay inside the OTN device can be met to a certain extent.

Optionally, in the embodiment of the present invention, the Preset minimum water level value (Preset-Min-level) may be configured by a designer, and considering that the jitter of the CPRI interface service is very low, the Preset-Min-level is configured as 2, for example, so that the influence of clock jitter on the service can be resisted, and the requirements of low delay and stable delay can be satisfied. It should be noted that, the embodiment of the present invention is not limited to the specific value of Preset-Min-level, and may also select an empirical value obtained by statistics, or configure according to the actual situation of the OTN device and the CPRI service.

Further, in the embodiment of the invention, after the first water level adjustment is performed on the FIFO module in the OTN device, the requirements on low delay and stable delay when the OTN device carries the service can be satisfied. However, the CPRI interface service has high requirement on symmetric delay, so that in order to further improve the delay performance of the OTN device, the requirement on symmetric delay needs to be ensured when the OTN device carries the service.

Optionally, in an implementation manner of the embodiment of the present invention, a Preset maximum water level value (Preset-Max-level) is set in the OTN device 10, as shown in fig. 7, which is a schematic structural diagram of still another OTN device provided in the embodiment of the present invention. Based on the structure of the OTN device shown in fig. 6, the OTN device 10 provided in the embodiment of the present invention may further include: and a delay compensation module 130 connected to the FIFO monitor adjustment module 120 and each FIFO module 110, respectively.

The delay compensation module 130 is configured to send a first delay compensation instruction to the corresponding FIFO module 110 according to the preset highest water level value and the lowest water level value of each FIFO module 110 measured by the FIFO monitoring and adjusting module 120;

the FIFO module 110 is further configured to adjust the highest water level value of the FIFO module 110 to be equal to a preset highest water level value according to the first delay compensation command sent by the delay compensation module 130, and keep the difference between the highest water level value and the lowest water level value unchanged. It should be noted that, when the highest water level is adjusted, the corresponding lowest water level will change, i.e. the difference between the highest water level value and the lowest water level value is kept to be a stable value.

In the embodiment of the invention, a mode of directly setting a Preset maximum water level value (Preset-Max-level) of each FIFO module in the OTN equipment is adopted, and in practical application, the same Preset-Max-level needs to be set for two butted OTN equipment, namely, the Max-level of the two butted OTN equipment is regulated to a certain Preset value (namely, preset-Max-level). It should be noted that, in the embodiment of the present invention, the content of the first delay compensation command and the instruction adjustment manner are similar to those of the water level adjustment command in the above embodiment, so that the description thereof is omitted.

Optionally, in another implementation manner of the embodiment of the present invention, as shown in fig. 8, a schematic structural diagram of still another OTN device provided in the embodiment of the present invention is shown. Based on the structure of the OTN device shown in fig. 6, the OTN device 10 provided in the embodiment of the present invention may further include: the delay transmission module 140 is connected with the FIFO monitoring and adjusting module 120, and the delay compensation module 130 is respectively connected with the FIFO monitoring and adjusting module 120 and each FIFO module 110, and the delay transmission module 140 is also connected with the opposite-end OTN device 20;

the delay transfer module 140 is configured to send the highest water level value of each FIFO module 110 in the OTN device 10 measured by the FIFO monitoring and adjusting module 120 to the opposite OTN device 20, and receive the highest water level value of each FIFO module in the opposite OTN device 20 sent by the opposite OTN device 20.

The delay compensation module 130 is configured to compare the highest water level value of each FIFO module 110 in the OTN device 10 with the highest water level value of the corresponding FIFO module in the opposite OTN device 20, and send a second delay compensation instruction to the corresponding FIFO module 110 according to the comparison result;

the FIFO module 110 in the embodiment of the invention is further configured to adjust, according to the second delay compensation instruction sent by the delay compensation module 130, that the highest water level value of the FIFO module 110 is equal to the highest water level value of the corresponding FIFO module, and keep the difference between the highest water level value and the lowest water level value unchanged. It should be noted that, when the highest water level is adjusted, the corresponding lowest water level will change, i.e. the difference between the highest water level value and the lowest water level value is kept to be a stable value.

In order to further improve the time delay performance of the OTN device, the time delay inside the OTN device may be quantized, i.e. transferred and compensated, on the base layer of the first water level adjustment. After the first water level adjustment is performed by the FIFO module, the max_level of the FIFO module reflects the time delay degree of the service passing through the FIFO module, and the time delay transfer module extracts the max_level of each FIFO module in the OTN device, so as to quantify the time delay degree in the OTN device and transfer the time delay degree to the opposite-end OTN device, and simultaneously obtains the max_level of each FIFO module in the opposite-end OTN device, which are prepared for time delay compensation, so as to meet the requirement of time delay symmetry.

In practical applications, there are various forms of quantization and transmission of internal delay of OTN devices, for example: mode one, directly transmitting Max_level of each FIFO module; calculating actual time delay by using Max_level and clock frequency, and transmitting the actual time delay; and thirdly, classifying the FIFO modules, summing up Max_levels of the similar FIFO modules, and transmitting the Max_levels. It should be noted that, the embodiment of the present invention does not limit the specific manner of transmitting the max_level, and any manner of transmitting the max_level in the embodiment of the present invention may be used as a manner of transmitting the max_level if the manner can be used as a basis of symmetric delay and the delay of the OTN devices of both sides is supplemented. It should be noted that, in the embodiment of the present invention, the content of the second delay compensation command and the indication adjustment manner are similar to those of the water level adjustment command in the above embodiment, so that the description thereof is omitted.

For example, max_level of each FIFO module in the OTN device may be directly transferred, or max_level may be transferred in a manner that the OTN device retains overhead. Referring to fig. 3, the OTN device 1 acquires max_level after the first water level adjustment by the local FIFO modules { A1, A2, A3 … An, B1, B2, B3 … Bn }, and transmits the max_level to the OTN device 2 by using a mode of overhead reservation through a line side, and receives a corresponding value sent by the OTN device 2.

After the local end OTN device transmits the Max_level and receives the Max_level transmitted by the opposite end OTN device, namely, the local end delay quantized value and the opposite end delay quantized value are obtained, the second water level adjustment can be performed according to the Max_level of the corresponding FIFO module, and the adjustment principle can be as follows: when Max_level of the FIFO module at the home terminal is smaller than Max_level of the corresponding FIFO module at the opposite terminal, the water level of the FIFO module at the home terminal is adjusted upwards until the time delays of the two corresponding FIFO modules are equal, and otherwise, the water level adjustment is not performed.

The two modes for carrying out the second water level adjustment can meet the requirement of the OTN equipment on time-setting symmetry, and the mode can be determined according to the actual application scene. That is, the manner of the second water level adjustment may be selected, for example, according to a Preset-Max-level, which may be configured by a designer, and also according to a transmitted delay quantization value.

The OTN equipment provided by the embodiment of the invention can ensure that the Min_level value of the corresponding FIFO module is near the Preset-Min-level by carrying out the first water level adjustment on the FIFO module after the power-on is stabilized, so that the transmission delay of the OTN equipment bearing service can be reduced, the water level of the FIFO module can be ensured to reach a relatively stable state after each power-on, and the requirements of low delay and stable delay are met. In addition, in the process of quantifying and transmitting the internal time delay value of the OTN equipment, or according to the Preset-Max-level, the FIFO module is subjected to secondary water level adjustment so as to compensate the internal time delay of the OTN equipment, thereby being beneficial to meeting the requirement of transmission time delay symmetry. The FIFO module can also provide interfaces for compensation of other asymmetric time delays, is convenient for subsequent further expansion, is particularly suitable for transmission of CPRI interface business by OTN equipment in a wireless forwarding networking scene, and meets the performance requirement of the CPRI interface business on low time delay, stable time delay and symmetric time delay in the transmission process.

The following illustrates, in an implementation example, the requirement of the CPRI interface service on the delay performance by adjusting the FIFO module when the OTN device provided by the embodiment of the present invention carries the CPRI interface service.

Since CPRI interface services have high requirements on latency performance, examples include: low delay, stable delay, symmetrical delay, etc. In the prior art, the manner of carrying CPRI interface service by OTN equipment is difficult to meet the above time delay requirement. Therefore, the OTN device provided by the embodiment of the invention is applied to the wireless forwarding scene shown in fig. 1, so that the time delay performance inside the OTN device can be ensured, a time delay compensation method and an interface are provided, and expansion support can be provided for other asymmetric time delays.

Fig. 9 is a schematic diagram of an application scenario in which an OTN device according to an embodiment of the present invention carries CPRI interface services. The scenario shown in fig. 9 illustrates the manner in which the water level adjustment is performed, taking as an example an implementation in which the light conversion unit (Optical Transform Unit, abbreviated as OTU) 2 carries the CPRI Option-4. According to the specification of the ITU-T g.709 protocol, CPRI is mapped to ODUflex by Bit-sync mapping procedure (Bit-synchronous Mapping Procedure, abbreviated as BMP) first, then ODUflex is mapped to optical channel data unit (Optical Channel Data Unit, abbreviated as OUD) 2 by generic mapping procedure (Generic Mapping Procedure, abbreviated as GMP) and then mapped and encapsulated into OTU2 for transmission over optical fiber. The FIFO module on the service path of the OTN device is mainly used for mapping/demapping of the service and processing across clock domains.

As shown in fig. 9. The mapping relation in the A direction is as follows:

1. cpri4 maps to A_FIFO_1 used by ODUflex;

2. ODUflex maps to a_fifo_2 used by ODU 2;

3. ODU2 maps to a_fifo_3 used by OTU 2.

The mapping relation in the B direction is as follows:

1. OTU2 demaps to b_fifo_1 used by ODU 2;

2. ODU2 demaps to b_fifo_2 used by ODUflex;

3. ODUflex demaps to b_fifo_3 used by Cpri 4.

Fig. 10 is a flow chart of water level adjustment performed by the OTN device according to the embodiment of the present invention. The method provided by the embodiment comprises the following steps of S110 to S140:

s110, after the OTN equipment 1 is powered on, monitoring the water level monitoring value of each FIFO module in the OTN equipment 1.

The FIFO module in the OTN device 1 includes: a_fifo_x, b_fifo_x, i.e. monitoring the max_level-min_level values of these FIFO modules, for example, during 16 OTU2 frame periods in succession, the variation of which is within 1 indicating that the CPRI interface traffic has stabilized; where t=otu2 frame periods, m=16, Δ= 1. Although the values of max_level and min_level are not fixed after each power-up, with the stability of the service (max_level-min_level) being relatively fixed, after a certain power-up and the service is stable, the water level value of each FIFO module in the OTN device 1 is shown in table 1:

Table 1 water level value after service stabilization of OTN device 1

S120, after the service of each FIFO module in the OTN device is stable, min_level of each FIFO module in the OTN device is adjusted to 2 (i.e. Preset-Min-level). In order to keep the adjusted (max_level-min_level) identical to that before adjustment, max_level may be adjusted accordingly. Through the first water level adjustment, lower transmission delay can be obtained on the basis of not affecting CPRI interface service, and meanwhile, the stability of power-on delay can be ensured. After this water level adjustment, the water level value of each FIFO module in the OTN device 1 is shown in table 2:

table 2 water level value after the first water level adjustment by OTN device 1

And S130, performing time delay compensation by the OTN equipment. The time delay compensation performed by the OTN device in this embodiment includes, for example, the following two modes.

Mode one: s131, configuring the same Preset-Max-level for each FIFO module in the OTN device 1 and the OTN device 2, adjusting the Max_level of each FIFO module to be equal to the Preset-Max-level, and keeping the Max_level-Min_level unchanged. The water level value of each FIFO module in the OTN device 1 after this adjustment is shown in table 3:

table 3 water level value after the OTN device 1 performs the second water level adjustment

In this adjustment manner, after the OTN device 2 executes the above-mentioned S110 to S130 as well, it can be ensured that the max_level of each FIFO module in the two OTN devices is the same, and other performances of the service cannot be affected. Thereby achieving the requirements of the transmission delay of the OTN devices 1 and 2 on stability and symmetry.

Mode two:

s132, the OTN device 1 transfers max_level of each FIFO module { a_fifo_x, b_fifo_x } of the home terminal to the OTN device 2, and receives max_level of each FIFO module thereof transferred by the OTN device 2. The above values may be transferred, for example, by overhead of ODU 2/ODUflex.

S133, on the basis of finishing the Max_level of the transmission FIFO module in S130, the OTN device 1 and the OTN device 2 respectively compare the difference of the Max_level of the local end (the near end) and the Max_level of the opposite end (the far end), and finish upward adjustment (the adjustment of the edge with a small value and a large edge value); finally, the purpose that the Max_level of the FIFO of the two butted OTN devices is the same is achieved, and therefore the requirements of the transmission delay of the OTN devices 1 and 2 on stability and symmetry are achieved. For example, after performing S110, S120 and S132, the OTN device 2 has the water level value of each FIFO module as shown in table 4:

table 4 water level value after first water level adjustment by OTN device 2

According to tables 2 and 4, the otn devices 1 and 2 interact with max_level of each FIFO module, and perform the second water level adjustment according to comparison between the interacted max_level and max_level of the local terminal. The water level values of the OTN devices 1 and 2 after the second water level adjustment are shown in tables 5 and 6, respectively.

Table 5 water level value after the OTN device 1 performs the second water level adjustment

TABLE 6 Water level value after the second Water level adjustment by OTN device 2

It should be noted that, in the flow shown in fig. 10, S131 and S132 to S133 are selectively executed, and S131 and S132 to S133 are two implementations of compensation adjustment performed by the FIFO module in the OTN device, which is usually alternatively executed.

Fig. 11 is a flowchart of a service processing method according to an embodiment of the present invention. The service processing method provided by the embodiment is suitable for the situation that the OTN equipment carries wireless forwarding in the C-RAN network, and is executed by the OTN equipment, and the OTN equipment is realized by combining hardware and software. As shown in fig. 11, the service processing method of the present embodiment may include the following steps, namely S210 to S220:

s210, monitoring the water level monitoring value of each FIFO module in the OTN equipment.

The service processing method provided by the embodiment of the invention is a method for processing a service when the OTN equipment carries the wireless forwarding in the C-RAN network, for example, the service carried by the OTN equipment is CPRI interface service. The OTN device of the embodiment of the present invention generally has a plurality of FIFO modules, which are configured to receive the service data stream transferred from the previous FIFO module (or the opposite OTN device) and transfer the service data stream to the next FIFO module (or the opposite OTN device). The operation principle of the OTN device shown in fig. 3 may be referred to, and the bearer service and the operation principle of the OTN device are described in detail in the foregoing embodiments, so that they will not be described in detail herein.

In the embodiment of the invention, the working principle of the FIFO module is the reading/writing operation of service data, namely, the data written by the FIFO module firstly reads out the data in the process of service transmission, when the writing operation is executed, the water level of the FIFO module rises, and when the reading operation is executed, the water level of the FIFO module falls, so that the water level of the FIFO module is related to the reading operation and the writing operation, namely, the reading/writing operation rate influences the highest water level value and the lowest water level value of the FIFO module. The method provided by the embodiment of the invention can monitor the water level monitoring value of each FIFO module in the OTN equipment, wherein the water level monitoring value can be determined by a designer according to the performance requirements of the FIFO module, and comprises a highest water level value, a lowest water level value and the difference between the highest water level value and the lowest water level value; when the water level monitoring value of a certain FIFO module in the OTN equipment meets the preset condition, the FIFO module is considered to be capable of being subjected to water level adjustment.

In the scenario that the OTN device carries the wireless forwarding in the C-RAN network, because the BBU and the RRU are both provided with the OTN device, in order to achieve the symmetry of time delay in the service transmission process, the number of FIFO modules in two directions in the OTN device is the same; that is, the FIFO modules in the OTN device of the embodiment of the invention are described as an even number, and the number of FIFO modules in each direction is equal.

S220, according to the water level monitoring value of each FIFO module, water level adjustment is carried out on the corresponding FIFO module.

The FIFO module in the embodiment of the invention has a function of adjusting the water level, and the water level of the common FIFO module in the prior art is generally determined by the rate of read/write operation, and the water level of the FIFO module cannot be flexibly adjusted. In the embodiment of the invention, any one FIFO module in the OTN equipment can acquire whether the FIFO module meets the condition of water level adjustment according to the monitored water level monitoring value, and the water level adjustment is carried out on the FIFO module when the condition is met.

In the scenario of carrying wireless forwarding by the OTN device provided by the embodiment of the invention, the requirement of CPRI interface service on time delay performance needs to be met, and the CPRI interface service has higher requirements on low time delay and stable time delay. The level of the water level value of the FIFO module indicates how much data is stored in the FIFO module, and because clocks of different FIFO modules may be inconsistent and the amount of buffered data is different, it is necessary to perform water level adjustment on each FIFO module in the OTN device after monitoring the water level monitoring value of the FIFO module. The water level schematic diagram of the FIFO module shown in fig. 4 may be referred to, in the read/write process of the FIFO module, there is a maximum water level value (max_level) and a minimum water level value (min_level), where the smaller the min_level is, the better the requirement of low latency is satisfied, but the smaller the min_level is, the lower the resistance to the clock variation performance is, and because the stability of the CPRI interface service itself is better, when the water level of the FIFO module is adjusted, the min_level may be adjusted to a relatively smaller value, for example, a Preset minimum water level value (Preset-Min-level) may be set in the OTN device, and in addition, when the water level adjustment of the FIFO module is performed, the water level of the FIFO module may be adjusted by referring to the Preset-Min-level after the water level monitoring value of the FIFO module is stable, so as to satisfy the requirement of the CPRI service for low latency and stable latency.

The service processing method provided by the embodiment of the present invention is the processing method of the OTN device provided by the embodiment shown in fig. 2 of the present invention, and has corresponding method steps, and its implementation principle and technical effects are similar, and are not repeated here.

Optionally, fig. 12 is a flowchart of another service processing method provided in an embodiment of the present invention. Based on the flow shown in fig. 11, S220 in the embodiment of the present invention may include:

s221, according to the water level monitoring value of each FIFO module, sending a water level adjusting instruction to the corresponding FIFO module;

s222, the FIFO module carries out water level adjustment on the FIFO module according to the write request signal or the read request signal and the received water level adjustment instruction.

Compared with the common FIFO module in the prior art, the FIFO module in the embodiment of the invention has the added function of controlling the water Level, which can be implemented by a Level control state machine (Level control fsm), for example, referring to the structure of the FIFO module shown in fig. 5, the Level Control FSM can send a water Level adjustment instruction to the corresponding FIFO module according to the water Level monitoring value of each FIFO module, so that when the FIFO module can receive an external write request signal or read request signal, the FIFO module can be combined with the water Level adjustment instruction to perform water Level adjustment on the FIFO module.

Further, in the embodiment of the present invention, the water level adjustment instruction is used to indicate the adjustment direction and the adjustment times, and the method provided in the embodiment of the present invention may further include, before S222:

the FIFO module sends out an adjustment response signal;

the implementation manner of S222 in the embodiment of the present invention may include: when receiving a write request signal or a read request signal, the FIFO module adjusts the water level of the FIFO module downwards or upwards by corresponding times according to the adjusting direction and the adjusting times in the water level adjusting instruction, and cancels the adjusting response signal after the water level adjustment is completed.

It should be noted that, the structure of the FIFO module in the embodiment of the invention may refer to the structure of the FIFO module in the embodiment shown in fig. 5; in addition, the form of the water level adjustment instruction and the content of the instruction adjustment in the embodiment of the present invention, and the manner in which the FIFO module performs the water level adjustment according to the instruction are already described in detail in the above embodiment, so that the description thereof is omitted here.

The service processing method provided by the embodiment of the present invention is the processing method of the OTN device provided by the embodiment of fig. 5 of the present invention, and has corresponding method steps, and its implementation principle and technical effects are similar, and are not repeated here.

Optionally, fig. 13 is a flowchart of another service processing method according to an embodiment of the present invention. Based on the flow shown in fig. 11, the implementation manner of S210 in the embodiment of the present invention may include:

s211, periodically measuring the highest water level value and the lowest water level value of each FIFO module in the OTN equipment;

s212, monitoring the difference value between the highest water level value and the lowest water level value of each FIFO module in a preset number of periods;

s213, when the difference value between the highest water level value and the lowest water level value of each FIFO module is smaller than or equal to the preset water level difference value, determining to adjust the water level of the corresponding FIFO module.

Optionally, in the embodiment of the present invention, the OTN device is provided with a preset minimum water level value, and the implementation manner of S220 may include:

and regulating the minimum water level value of the FIFO module to be equal to the preset minimum water level value according to the maximum water level value, the minimum water level value and the preset minimum water level value of the FIFO module, and keeping the difference between the maximum water level value and the minimum water level value unchanged. It should be noted that, when the minimum water level is adjusted, the corresponding maximum water level will change accordingly, i.e. the difference between the maximum water level value and the minimum water level value is kept to be a stable value. The principle and basis of the FIFO module in the embodiment of the invention for adjusting the water level, the adjustment mode and the effect after adjustment are described in detail in the above embodiment, so that the description thereof is omitted here.

It should be noted that, in the embodiment of the present invention, the Preset minimum water level value (Preset-Min-level) may be configured by a designer, and considering that the jitter of the CPRI interface service is very low, the Preset-Min-level is configured as 2, for example, so that the influence of clock jitter on the service can be resisted, and the requirements of low delay and stable delay can be satisfied. It should be noted that, the embodiment of the present invention is not limited to the specific value of Preset-Min-level, and may also select an empirical value obtained by statistics, or configure according to the actual situation of the OTN device and the CPRI service.

The service processing method provided by the embodiment of the present invention is the processing method of the OTN device provided by the embodiment shown in fig. 6 of the present invention, and has corresponding method steps, and its implementation principle and technical effects are similar, and are not repeated here.

Optionally, in an implementation manner of the embodiment of the present invention, a Preset-Max-level is set in the OTN device, as shown in fig. 14, which is a flowchart of still another service processing method provided in the embodiment of the present invention. On the basis of the flow shown in fig. 11, the method provided by the embodiment of the invention may further include:

s230, according to the preset highest water level value and the lowest water level value of the FIFO module, the highest water level value of the FIFO module is adjusted to be equal to the preset highest water level value, and the difference between the highest water level value and the lowest water level value is kept unchanged. It should be noted that, when the highest water level is adjusted, the corresponding lowest water level will change, i.e. the difference between the highest water level value and the lowest water level value is kept to be a stable value.

In the embodiment of the invention, a mode of directly setting a Preset maximum water level value (Preset-Max-level) of each FIFO module in the OTN equipment is adopted, and in practical application, the same Preset-Max-level needs to be set for two butted OTN equipment, namely, the Max-level of the two butted OTN equipment is regulated to a certain Preset value (namely, preset-Max-level).

The service processing method provided by the embodiment of the present invention is the processing method of the OTN device provided by the embodiment shown in fig. 7 of the present invention, and has corresponding method steps, and its implementation principle and technical effects are similar, and are not repeated here.

Optionally, in another implementation manner of the embodiment of the present invention, as shown in fig. 15, a flowchart of still another service processing method provided by the embodiment of the present invention is shown. On the basis of the flow shown in fig. 11, the method provided by the embodiment of the invention may further include:

s240, the highest water level value of each FIFO module in the OTN equipment is sent to the opposite-end OTN equipment, and the highest water level value of each FIFO module in the opposite-end OTN equipment sent by the opposite-end OTN equipment is received;

s250, comparing the highest water level value of each FIFO module in the OTN equipment with the highest water level value of the corresponding FIFO module in the opposite end OTN equipment, adjusting the highest water level value of the FIFO module in the OTN equipment to be equal to the highest water level value of the corresponding FIFO module according to the comparison result, and keeping the difference between the highest water level value and the lowest water level value unchanged. It should be noted that, when the highest water level is adjusted, the corresponding lowest water level will change, i.e. the difference between the highest water level value and the lowest water level value is kept to be a stable value.

After the local end OTN device transmits max_level and receives max_level transmitted by the opposite end OTN device, the local end delay quantized value and the opposite end delay quantized value are obtained, and the second water level adjustment can be performed according to max_level of the corresponding FIFO module, where the adjustment method is shown in fig. 16, and is a flow chart for performing delay compensation in a service processing method provided by the embodiment of the invention, and the flow chart includes the following steps:

s310, judging whether Max_level of the FIFO module at the home terminal is smaller than Max_level of the corresponding FIFO module at the opposite terminal;

s320, when the Max_level of the local end FIFO module is smaller than the Max_level of the corresponding FIFO module of the opposite end, the water level of the local end FIFO module is adjusted upwards; subsequently, S310 to S320 are continued until max_levels of the corresponding two FIFO modules are equal.

In addition, when Max_level of the local end FIFO module is greater than or equal to Max_level of the corresponding FIFO module of the opposite end, the process is ended, namely, water level adjustment is not performed.

The service processing method provided by the embodiment of the present invention is the processing method of the OTN device provided by the embodiment of fig. 8 of the present invention, and has corresponding method steps, and its implementation principle and technical effects are similar, and are not repeated here.

The embodiment of the invention also provides a computer readable storage medium, which stores computer executable instructions, and when the processor executes the computer executable instructions, the following operations are performed:

S41, monitoring a water level monitoring value of each FIFO module in the OTN equipment;

s42, according to the water level monitoring value of each FIFO module, water level adjustment is carried out on the corresponding FIFO module.

Optionally, in an embodiment of the present invention, when the processor executes the computer executable instructions, an implementation manner of performing operation S42 may include:

s421, according to the water level monitoring value of each FIFO module, a water level adjusting instruction is sent to the corresponding FIFO module;

s422, the FIFO module carries out water level adjustment on the FIFO module according to the write request signal or the read request signal and the received water level adjustment instruction.

Optionally, in an embodiment of the present invention, the water level adjustment instruction is used to indicate the adjustment direction and the adjustment times, and the processor executes the computer executable instruction, and before executing operation S422, may further perform the following operations:

s4211, the FIFO module sends out an adjustment response signal;

s4212, the FIFO module performs water level adjustment on the FIFO module, comprising:

s4213, when receiving the write request signal or the read request signal, the FIFO module adjusts the water level of the FIFO module downwards or upwards for corresponding times according to the adjustment direction and the adjustment times in the water level adjustment command, and cancels the adjustment response signal after the water level adjustment is completed.

Optionally, in an embodiment of the present invention, when the processor executes the computer executable instructions, an implementation manner of performing operation S41 may include:

s411, periodically measuring the highest water level value and the lowest water level value of each FIFO module in the OTN equipment;

s412, monitoring the difference value between the highest water level value and the lowest water level value of each FIFO module in a preset number of periods;

s413, when the difference value between the highest water level value and the lowest water level value of each FIFO module is smaller than or equal to the preset water level difference value, determining to adjust the water level of the corresponding FIFO module.

Optionally, in an embodiment of the present invention, a preset minimum water level value is set in the OTN device, and when the processor executes the computer executable instruction, an implementation manner of executing operation S42 may include:

and regulating the minimum water level value of the FIFO module to be equal to the preset minimum water level value according to the maximum water level value, the minimum water level value and the preset minimum water level value of the FIFO module.

In a possible implementation manner of the embodiment of the present invention, the OTN device is provided with a preset maximum water level value, and when the processor executes the computer executable instruction, the following operations may be further performed:

s43, according to the preset highest water level value and the lowest water level value of the FIFO module, the highest water level value of the FIFO module is adjusted to be equal to the preset highest water level value.

In another possible implementation manner of the embodiment of the present invention, when the processor executes the computer executable instructions, the following operations may be further performed:

s44, the highest water level value of each FIFO module in the OTN equipment is sent to the opposite-end OTN equipment, and the highest water level value of each FIFO module in the opposite-end OTN equipment sent by the opposite-end OTN equipment is received;

s45, comparing the highest water level value of each FIFO module in the OTN equipment with the highest water level value of the corresponding FIFO module in the opposite end OTN equipment, and adjusting the highest water level value of the FIFO module in the OTN equipment to be equal to the highest water level value of the corresponding FIFO module according to the comparison result.

Those of ordinary skill in the art will appreciate that all or a portion of the steps of the methods described above may be performed by a program that instructs associated hardware (e.g., a processor) to perform the steps, and that the program may be stored on a computer readable storage medium such as a read only memory, a magnetic or optical disk, etc. Alternatively, all or part of the steps of the above embodiments may be implemented using one or more integrated circuits. Accordingly, each module/unit in the above embodiments may be implemented in the form of hardware, for example, by an integrated circuit, or may be implemented in the form of a software functional module, for example, by a processor executing a program/instruction stored in a memory to implement its corresponding function. Embodiments of the invention are not limited to any specific form of combination of hardware and software.

Although the embodiments of the present invention are described above, the embodiments are only used for facilitating understanding of the present invention, and are not intended to limit the present invention. Any person skilled in the art can make any modification and variation in form and detail without departing from the spirit and scope of the present disclosure, but the scope of the present disclosure is to be determined by the appended claims.

Claims

1. An optical transport network device, wherein the optical transport network OTN device comprises: the system comprises a plurality of first-in first-out queue FIFO modules and FIFO monitoring and adjusting modules respectively connected with each FIFO module;

the FIFO monitoring and adjusting module is used for monitoring the water level monitoring value of each FIFO module in the OTN equipment and sending a water level adjusting instruction to the corresponding FIFO module according to the monitoring result; the water level monitoring value is related to the speed of the read operation and the write operation of the FIFO module, and comprises a highest water level value, a lowest water level value and the difference between the highest water level value and the lowest water level value;

2. The optical transmission network device according to claim 1, wherein the FIFO module comprises: a state control unit and a FIFO unit;

3. The optical transmission network apparatus according to claim 2, wherein the FIFO module further comprises a first logic gate and a second logic gate, the water level adjustment instruction being for indicating an adjustment direction and an adjustment number, the water level adjustment instruction and the write request signal being connected to an input of the first logic gate, the water level adjustment instruction and the read request signal being connected to an input of the second logic gate, an output of the first logic gate and an output of the second logic gate being connected to the FIFO unit, respectively, the write request signal and the read request signal being connected to the state control unit, respectively;

4. The optical transmission network apparatus according to claim 1, wherein the FIFO monitoring and adjusting module comprises:

5. The optical transport network device according to claim 4, wherein a preset minimum water level value is set in the OTN device, and the FIFO module performs water level adjustment on the FIFO module, including:

6. The optical transport network device according to claim 4 or 5, wherein a preset highest water level value is set in the OTN device, and the OTN device further comprises: the time delay compensation module is respectively connected with the FIFO monitoring and adjusting module and each FIFO module;

7. The optical transport network device according to claim 4 or 5, wherein the OTN device further comprises: the time delay transmission module is connected with the FIFO monitoring and adjusting module, and the time delay compensation module is respectively connected with the FIFO monitoring and adjusting module and each FIFO module, and is also connected with the opposite-end OTN equipment;

8. A method for processing a service, comprising:

monitoring a water level monitoring value of each first-in first-out queue FIFO module in the OTN equipment; the water level monitoring value is related to the speed of the read operation and the write operation of the FIFO module, and comprises a highest water level value, a lowest water level value and the difference between the highest water level value and the lowest water level value;

9. The traffic processing method according to claim 8, wherein the performing water level adjustment on the corresponding FIFO module according to the water level monitoring value of each FIFO module comprises:

10. The service processing method according to claim 9, wherein the water level adjustment instruction is used for indicating an adjustment direction and an adjustment frequency, and before the FIFO module performs water level adjustment on the FIFO module, the method further comprises:

the FIFO module sends out an adjustment response signal;

11. The service processing method according to claim 8, wherein monitoring the water level monitoring value of each FIFO module in the OTN device comprises:

12. The service processing method according to claim 11, wherein a preset minimum water level value is set in the OTN device, and the performing water level adjustment on the corresponding FIFO module includes:

13. The service processing method according to claim 11 or 12, wherein a preset highest water level value is set in the OTN device, and the method further comprises:

14. The service processing method according to claim 11 or 12, characterized in that the method further comprises: