CN113098651A

CN113098651A - Bandwidth adjusting method and device

Info

Publication number: CN113098651A
Application number: CN202010019245.4A
Authority: CN
Inventors: 向俊凌; 陈玉杰; 孙亮; 苏伟
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2020-01-08
Filing date: 2020-01-08
Publication date: 2021-07-09
Also published as: WO2021139607A1

Abstract

The application discloses a bandwidth adjusting method and device, which are used for providing a feasible scheme to adjust the bandwidth of a data unit to adapt to the bandwidth change of a client side service. For bandwidth increase, a source node triggers control information of channel bandwidth increase and forwards the control information down hop by hop on a transmission path, and after each hop receives the control information, the channel bandwidth increase of the node is executed. And finishing channel bandwidth increase at the sink node, and increasing the bandwidth of the service mapping data unit to the target bandwidth by the source node. Similarly, for bandwidth reduction, the source node reduces the bandwidth of the service mapping data unit to a target bandwidth, the source node triggers control information of channel bandwidth reduction and forwards the control information to the transmission path hop by hop, and after each hop receives the control information, the channel bandwidth reduction of the own node is executed. In addition, the bandwidth can be increased or decreased by executing the steps for adjusting the bandwidth step for each time.

Description

Bandwidth adjusting method and device

Technical Field

The embodiment of the application relates to the technical field of communication, in particular to a bandwidth adjusting method and device.

Background

The industry is currently considering the use of data units to implement flexible converged bearers for multiple services. The multiple services are mapped to different data units, respectively. The multiple services correspond to multiple data streams, and each data stream is composed of a plurality of data units. And the multiple data streams are respectively configured with strict fixed bandwidths. After being converged, data units of data streams of multiple services are mapped into a payload area of an optical payload unit of an Optical Transport Network (OTN).

The data unit mode adopts a strict rate supervision mechanism and a priority level scheduling mechanism to ensure the bandwidth utilization of each path of service and reflect the differentiated transmission of the service. The bandwidth of the client side traffic may vary, and therefore, after the client side traffic is carried to the data unit, the data unit is required to be able to adapt to the bandwidth variation of the client side traffic. There is currently no feasible solution to adjust the bandwidth of the data units to adapt to the bandwidth variations of the client side traffic.

Disclosure of Invention

The embodiment of the application provides a bandwidth adjusting method and device, which are used for providing a feasible scheme to adjust the bandwidth of a data unit to adapt to the bandwidth change of a client side service.

In a first aspect, an embodiment of the present application provides a bandwidth adjustment method, which is applied to a first network node. For example by a processor, a chip, a system of chips or a module with transmission control functionality in the first network node. The method comprises the following steps: determining a bandwidth adjustment value of a service; then, the number of data units is updated according to the bandwidth adjustment value. The number of the data units is the number of the data units for carrying the service in the number of the units scheduled in one transmission period. Further, the data units carrying the service are mapped to the data frames according to the updated number of the data units.

The first network node may be a source node, an intermediate node, or a sink node on a transmission path of the traffic.

The method only needs to adjust the number of the data units, does not influence the service packaging process, and has high reliability and high speed.

In one possible design, the bandwidth adjustment value is a target bandwidth required by the service or a bandwidth adjustment step size, the bandwidth adjustment step size is a bandwidth which is increased or decreased each time when the target bandwidth required by the service is adjusted to N times, and N is an integer greater than 1.

In one possible design, the bandwidth adjustment value is a target bandwidth, and the first network node is a source node or an intermediate node on a transmission path of the traffic, and the method further includes: the first network node sends control information to a second network node, the control information is used for indicating to update the number of the data units, and the second network node is a next hop network node of the first network node on a transmission path. The nodes only need to adjust the channel bandwidth hop by hop on the transmission path, and the scheme is simple and easy to implement. In addition, the design adopts a one-way hop-by-hop adjustment mode, so that the method is suitable for both one-way propagation service and broadcast service.

In one possible design, when the bandwidth is adjusted to be increased, that is, the target bandwidth is higher than the bandwidth of the service before adjustment, the first network node serves as a source node, and after sending the control information to the second network node, receives acknowledgement information from the sink node, where the acknowledgement information is used to indicate that the sink node on the transmission path of the service has completed updating the number of data units, and then the first network node adjusts the bandwidth mapped to the data units by the service according to the target bandwidth. The bandwidth of the data channel is increased first, and then the bandwidth of the service mapping is increased, so that the congestion of the scheduling of the data unit of the service is prevented.

In one possible design, when the bandwidth adjustment value is a target bandwidth and the bandwidth adjustment is a bandwidth reduction, i.e. the target bandwidth is lower than the bandwidth of the service before adjustment, the first network node serves as a source node and adjusts the bandwidth mapped to the data units by the service according to the target bandwidth before updating the number of the data units according to the target bandwidth. In the scene of bandwidth reduction, the bandwidth of the service mapping is reduced firstly, and then the bandwidth of the data channel is reduced, so that the waste of the service mapping bandwidth caused by the reduction of the service rate is prevented.

In one possible design, the bandwidth adjustment value is a bandwidth adjustment step size, and the first network node performs the following bandwidth adjustment step N times in a loop after determining the bandwidth adjustment step size. The bandwidth adjustment steps are as follows: and updating the number of the data units according to the bandwidth adjustment step length, and mapping the data units bearing the services to the data frames according to the updated number of the data units.

And the bandwidth of the data channel is gradually adjusted to the target bandwidth by adopting a mode of adjusting the channel bandwidth for multiple times, and the scheme is easy to realize.

In one possible design, the bandwidth adjustment value is a bandwidth adjustment step size, the first network node is a source node on a transmission path of the service, and the first network node sends control information to a next-hop network node of the first network node after updating the number of data units according to the bandwidth adjustment step size each time.

In one possible design, the bandwidth adjustment value is a bandwidth adjustment step size, and the sink node sends, to the source node, an update indicating that the sink node has completed the nth number of data units when the nth number of data units update is completed. The sink node may send the acknowledgement information to the source node through the transmission path or through the controller. The sink node completes the nth update of the number of data units.

In a possible design, the bandwidth adjustment value is a bandwidth adjustment step size, and if the target bandwidth is higher than the bandwidth of the service before adjustment, the source node adjusts the bandwidth mapped to the data unit by the service according to the target bandwidth when receiving the acknowledgment information indicating that the destination node has completed the nth update of the number of data units.

In one possible design, the bandwidth adjustment value is a bandwidth adjustment step size, and the source node adjusts the bandwidth mapped to the data unit according to the target bandwidth adjustment service before performing the bandwidth adjustment step.

In one possible design, the controller configures tuning parameters for nodes on the transmission path. The adjustment parameter includes a bandwidth adjustment value. If the bandwidth adjustment value is the bandwidth adjustment step length, the adjustment parameter further includes the target bandwidth. Therefore, when the source node, the intermediate node or the sink node determines the bandwidth adjustment value, the bandwidth adjustment value can be determined according to the adjustment parameters sent by the controller.

In one possible design, the controller may configure the adjustment parameter for the source node, and the source node sends control information to the next hop, where the adjustment parameter is carried in the control information. When the intermediate node or the host node determines the bandwidth adjustment value, the bandwidth adjustment value can be determined according to the adjustment parameter carried by the control information.

In one possible design, the bandwidth adjustment value is a bandwidth adjustment step size, the first network node is a source node on a transmission path of the service, the adjustment parameter includes a target bandwidth and the bandwidth adjustment step size, and the source node determines N according to the target bandwidth and the bandwidth adjustment step size.

In one possible design, the first network node is a source node on a transmission path of the traffic, and the source node sends the check information to a sink node of the transmission path before performing bandwidth adjustment (or before updating the number of data units according to a bandwidth adjustment value) after receiving the adjustment parameter sent by the controller. The check information carries an adjusting parameter (including a target bandwidth or including the target bandwidth and a bandwidth adjusting step length), and the check information is used for indicating a node on a transmission path to verify whether the received adjusting parameter is consistent with an adjusting parameter configured by the controller; and then, the source node receives a check confirmation, wherein the check confirmation is used for indicating each node on the transmission path to check that the adjustment parameters in the received check information are consistent with the adjustment parameters configured by the controller.

Through the design, after the controller configures the target bandwidth for each node on the transmission path, the target bandwidth configured by each node may be wrong due to different management domains where each node is located.

In one possible design, the control information is encapsulated in data units used to carry the traffic. The design encapsulates the control information in the data unit, and a channel for transmitting the control information is not required to be established on a transmission path, so that the resource waste is reduced.

In one possible design, the control information is encapsulated in data units used to carry overhead. The data unit for carrying overhead includes only an overhead region and does not include a payload region. That is, the data unit for carrying the overhead is only used for carrying the overhead and not used for carrying the traffic.

In a second aspect, an embodiment of the present application provides a bandwidth adjustment method, which is applied in a scenario where a second data channel for transmitting a service between a source node and a sink node is switched to a first data channel. The method comprises the following steps: the source node adjusts the step length according to the configured first bandwidth, executes the ith increase of the bandwidth of the first data channel, and sends first control information to the first network node; the first network node is a next hop network node of a source node on the first data channel, and the first control information is used for indicating the first network node to increase the bandwidth of the first data channel; then, under the condition that the bandwidth of the second data channel is larger than zero, when the source node determines to receive the first confirmation information from the host node, executing the jth reduction of the bandwidth of the second data channel according to the configured second bandwidth adjustment step length, and sending second control information to the second network node; the second network node is a next hop network node of the source node on the second data channel, the first acknowledgement information is used for indicating that the sink node finishes the ith increase of the bandwidth of the first data channel, and the second control information is used for indicating that the second network node reduces the bandwidth of the second data channel; further, the source node receives second acknowledgement information from the sink node, where the second acknowledgement information is used to indicate that the sink node has completed the reduction of the bandwidth of the jth second data channel; wherein the second bandwidth adjustment step is less than or equal to the first bandwidth adjustment step. i is taken by a positive integer less than or equal to N1, N1 is the number of adjustments required to increase the bandwidth of the first data channel to the target bandwidth required by the traffic, j is taken by a positive integer less than or equal to N2, N2 is the number of adjustments required to decrease the bandwidth of the second data channel from the bandwidth of the traffic before the adjustments to zero, and N1 is greater than N2.

By the scheme, when the residual bandwidth of the original transmission path does not meet the adjustment requirement of the service bandwidth, the data unit of the service of the original transmission path is gradually moved to the new transmission path for transmission for multiple times in a mode of switching the new transmission path. When the original transmission path is moved to a new transmission path at one time, due to the fact that time delay exists in service transmission on different transmission paths, service time reaching a destination node is different, and service congestion on the destination node caused by transmission time delay can be prevented by adopting a mode of multiple gradual migration.

Certainly, when the target bandwidth is changed less than the original bandwidth, the migration can be completed at one time, i.e., i and j both take the value of 1.

In one possible design, the source node adjusts the rate at which traffic is mapped to data units of the traffic according to the target bandwidth required by the traffic when determining that the sink node has completed the nth 1 increase in bandwidth of the first data path.

In one possible design, the source node receives an adjustment parameter sent by the controller, where the adjustment parameter includes a bandwidth adjustment step size and a target bandwidth required by the service; and the source node determines N1 according to the target bandwidth and the bandwidth adjustment step size, and determines N2 according to the bandwidth of the service before adjustment and the bandwidth adjustment step size.

In one possible design, after receiving the adjustment parameter, the source node sends, before performing bandwidth adjustment of the service, check information to the sink node through the first data channel, and sends, to the sink node through the second data channel, the check information including the adjustment parameter, where the check information is used to indicate the node on the first data channel and the node on the second data channel to verify whether the adjustment parameter in the check information is consistent with the adjustment parameter configured by the controller; the source node receives a first check confirmation sent by the first network node, wherein the first check confirmation is used for indicating that the adjustment parameters in the determined check information of each node on the first data channel are consistent with the adjustment parameters configured by the controller; then, the source node receives a second check acknowledgement sent by the second network node, where the second check acknowledgement is used to indicate that the adjustment parameters in the determined check information of each node on the second data channel are consistent with the adjustment parameters configured by the controller.

In one possible design, the first control information is encapsulated in a data unit for the bearer service or the second control information is encapsulated in a data unit for the bearer service.

In one possible design, the first control information is encapsulated in a data unit for carrying overhead or the second control information is encapsulated in a data unit for carrying traffic. The data unit for carrying overhead includes only an overhead region and does not include a payload region. That is, the data unit for carrying the overhead is only used for carrying the overhead and not used for carrying the traffic.

In a third aspect, an apparatus is provided in an embodiment of the present application. The apparatus comprises a processor and a memory, wherein: the memory for storing program code; the processor is configured to read and execute the program code stored in the memory to implement the method of the first aspect or any design thereof, or to implement the method of the second aspect or any design thereof, or to implement the method of the third aspect or any design thereof.

In a fourth aspect, an embodiment of the present application provides a bandwidth adjustment system, which includes a source node, intermediate nodes (the number may be one or more), and a sink node. And the source node is used for receiving the target bandwidth required by the service from the controller, updating the number of the data units according to the target bandwidth, mapping the data units bearing the service to the data frames according to the updated number of the data units, and sending control information to the intermediate node. The number of data units is the number of data units for carrying a service in the data units scheduled in one transmission cycle, and the control information is used for indicating to update the number of data units. And the intermediate node is used for receiving the control information, updating the number of the data units according to the determined target bandwidth, mapping the data units bearing the service to the data frames according to the updated number of the data units, and sending the control information to the next hop network node of the intermediate node. And the host node is used for receiving the control information, updating the number of the data units according to the determined target bandwidth, mapping the data units bearing the service to the data frames according to the updated number of the data units, and sending confirmation information to the source node, wherein the confirmation information is used for indicating that the host node finishes the bandwidth adjustment of the service.

The fourth aspect is applicable to the scenario in which the bandwidth adjustment value in the first aspect or the related design is the target bandwidth, and the source node, the intermediate node, or the sink node may further perform other possible operations, which may be specifically referred to in the description of the operation performed by the source node, the intermediate node, or the sink node in the design of the first aspect or the first aspect, and details are not repeated here.

In a fifth aspect, an embodiment of the present application provides a bandwidth adjustment system, which includes a source node, intermediate nodes (the number of the intermediate nodes may be one or more), and a sink node.

The source node is used for determining the bandwidth adjustment step length, circularly executing the step of adjusting the channel bandwidth for N times, executing the step of adjusting the bandwidth once and sending control information once to the intermediate node; the step of adjusting the channel bandwidth comprises the following steps: updating the number of data units according to the bandwidth adjustment step length, and mapping the data units bearing the service to the data frames according to the updated number of the data units; the number of the data units is the number of the data units used for bearing the service in the data units scheduled by one transmission cycle, and the control information is used for indicating the intermediate node to adjust the number of the data units;

the intermediate node is used for executing a channel bandwidth adjusting step after receiving the control information every time, and sending the control information to a next hop network node of the intermediate node;

the sink node is used for executing the channel bandwidth adjusting step once after receiving the control information each time; and after the bandwidth adjustment for N times is determined to be completed, sending confirmation information to the source node, wherein the confirmation information is used for indicating that the host node completes the updating of the number of the data units for the Nth time.

In one possible design, the determination that the adjustment of the channel bandwidth is completed N times may be implemented in a manner that the number of times the control information is received is determined to be N times. The other mode is that the control information carries the number of times of current bandwidth adjustment, the number of times carried by the control information is determined to be N, and the data unit of the updated data unit quantity bearer service is mapped to the data frame.

The fifth aspect is applicable to the scenario in which the bandwidth adjustment value in the first aspect or the related design is the bandwidth adjustment step size, and the source node, the intermediate node, or the sink node may further perform other possible operations, which may be specifically referred to in the description of the operation performed by the source node, the intermediate node, or the sink node in the design of the first aspect or the first aspect, and details are not repeated here.

In a sixth aspect, an embodiment of the present application provides a bandwidth adjustment system, which is applied in a scenario where a second data channel for transmitting a service between a source node and a sink node is switched to a first data channel. The bandwidth adjustment system includes a source node, first intermediate nodes (the number of the first intermediate nodes may be one or more) on a first data path, second intermediate nodes (the number of the second intermediate nodes may be one or more) on a second data path, and a sink node.

The source node adjusts the step length according to the configured first bandwidth, executes the ith increase of the bandwidth of the first data channel, and sends first control information to the first intermediate node; the first control information is used for indicating the first intermediate node to increase the bandwidth of the first data channel; and the first intermediate node performs the ith increase of the bandwidth of the first data channel according to the bandwidth adjustment step length and sends first control information to the next hop network node. And after receiving the first control information, the host node performs ith increase of the bandwidth of the first data channel according to the bandwidth adjustment step length, and sends first confirmation information to the source node.

Under the condition that the bandwidth of the second data channel is larger than zero, when the source node determines that the first confirmation information from the host node is received, executing the jth reduction of the bandwidth of the second data channel according to the configured second bandwidth adjustment step length, and sending second control information to the second intermediate node; the first confirmation information is used for indicating that the sink node finishes the ith increase of the bandwidth of the first data channel, and the second control information is used for indicating that the second intermediate node reduces the bandwidth of the second data channel; and the second intermediate node performs the ith increase of the bandwidth of the second data channel according to the bandwidth adjustment step length and sends second control information to the next hop network node. And after receiving the second control information, the host node performs ith increase of the bandwidth of the second data channel according to the bandwidth adjustment step length, and sends second confirmation information to the source node. Further, the source node receives second acknowledgement information from the sink node, the second acknowledgement information indicating that the sink node has completed the reduction of the bandwidth of the j-th second data channel. The second bandwidth adjustment step is less than or equal to the first bandwidth adjustment step. Wherein i is a positive integer less than or equal to N1, N1 is the number of adjustments required to increase the bandwidth of the first data channel to the target bandwidth required by the traffic, j is a positive integer less than or equal to N2, N2 is the number of adjustments required to decrease the bandwidth of the second data channel from the bandwidth of the traffic before the adjustments to zero, and N1 is greater than N2.

In one possible design, after the source node determines that the sink node has completed the N2 th reduction of the bandwidth of the second data channel (the bandwidth of the second data channel has been reduced to 0), the source node may increase the bandwidth of the first data channel to the target bandwidth by one adjustment.

In a seventh aspect, the present application provides a computer-readable storage medium, where a software program is stored, and when the software program is read and executed by one or more processors, the software program may implement the method provided by any one of the designs of the first aspect or the second aspect.

In an eighth aspect, embodiments of the present application provide a computer program product including instructions. When run on a computer, cause the computer to perform the method provided by any of the designs of the first or second aspects described above.

In a ninth aspect, embodiments of the present application provide a chip. The chip is connected with the memory and used for reading and executing the software program stored in the memory so as to realize the method provided by any one of the designs of the first aspect or the second aspect.

Drawings

Fig. 1 is a schematic diagram of an OTN network architecture in the embodiment of the present application;

FIG. 2 is a schematic structural diagram of an OTN device in the embodiment of the present application;

FIG. 3 is a schematic diagram of a possible structure of a data unit in the embodiment of the present application;

FIG. 4 is a schematic diagram of a data unit mapped to a payload region of an Optical Payload Unit (OPU) in an embodiment of the present application;

fig. 5 is a schematic diagram of a possible service transmission path in an embodiment of the present application;

FIG. 6 is a flow chart illustrating a possible bandwidth increasing method according to an embodiment of the present application;

FIG. 7 is a flow chart illustrating a possible bandwidth reduction method according to an embodiment of the present application;

FIG. 8 is a flow chart of another possible bandwidth increasing method in the embodiment of the present application;

fig. 9 is a schematic diagram illustrating a correspondence relationship between bandwidth increasing time and a bandwidth value after each bandwidth increase in the embodiment of the present application;

FIG. 10 is a diagram illustrating an example of a possible overhead data unit for encapsulating control information in an embodiment of the present application;

FIG. 11 is a flow chart illustrating a possible bandwidth reduction method according to an embodiment of the present application;

fig. 12 is a schematic diagram illustrating a correspondence relationship between data channel bandwidth reduction time and a bandwidth value after each data channel bandwidth reduction in an embodiment of the present application;

fig. 13 is a schematic diagram of another possible traffic transmission path in the embodiment of the present application;

FIG. 14 is a flow chart illustrating another possible bandwidth increasing method in an embodiment of the present application;

FIG. 15 is a flow chart illustrating another possible bandwidth increasing method in an embodiment of the present application;

FIG. 16 is a schematic structural diagram of a possible bandwidth adjusting apparatus according to an embodiment of the present application;

fig. 17 is a schematic structural diagram of another possible bandwidth adjusting apparatus in the embodiment of the present application.

Detailed Description

The embodiments of the present application will be described in detail below with reference to the accompanying drawings.

The embodiment of the application is suitable for an optical network, for example: and (3) OTN. An OTN is generally formed by connecting a plurality of devices through optical fibers, and can be formed into different topological types such as a linear type, a ring type, a mesh type and the like according to specific needs. The OTN as shown in fig. 1 is composed of two OTN networks. Each OTN network consists of a certain number of OTN devices (NE 1-NE 7). According to actual needs, one OTN device may have different functions. Generally, OTN devices are classified into optical layer devices, electrical layer devices, and opto-electric hybrid devices. Optical layer device refers to a device capable of processing optical layer signals, such as: optical Amplifiers (OA). An electrical layer device refers to a device capable of processing electrical layer signals, such as: a device capable of processing OTN signals. An opto-electric hybrid device refers to a device that has the capability to process both optical layer signals and electrical layer signals. It should be noted that, according to specific integration needs, one OTN device may integrate a plurality of different functions. The technical scheme provided by the application is suitable for OTN equipment with different forms and integration levels.

Fig. 2 is a schematic diagram of a possible OTN device structure. The OTN device herein may refer to OTN nodes (N1-N7) in fig. 1. Specifically, an OTN device includes a power supply, a fan, an auxiliary board, and may further include a support board, a circuit board, a cross board, an optical layer processing board, and a system control and communication board. The power supply is used for supplying power to the OTN device, and may include an active power supply and a standby power supply. The fan is used for radiating heat for the equipment. The auxiliary single board is used for providing an external alarm or accessing an external clock and other auxiliary functions. The branch board, the cross board and the circuit board are mainly used for processing electric layer signals of the OTN. The tributary board is used for receiving and transmitting various client services, such as SDH service, packet service, ethernet service, and fronthaul service. Further, the branch board may be divided into a client-side light module and a signal processor. The client side optical module may be an optical transceiver for receiving and/or transmitting traffic data. The signal processor is used for realizing the mapping and de-mapping processing of the service data to the data frame. The cross board is used for realizing the exchange of data frames and completing the exchange of one or more types of data frames. The circuit board mainly realizes the processing of the data frame at the line side. Specifically, the wiring board may be divided into a line side optical module and a signal processor. The line side optical module may be a line side optical transceiver for receiving and/or transmitting data frames. The signal processor is used for realizing multiplexing and de-multiplexing or mapping and de-mapping processing of data frames on the line side. The system control and communication single board is used for realizing system control and communication. Specifically, information may be collected from different boards through a backplane, or a control instruction may be sent to a corresponding board. It should be noted that, unless otherwise specified, a specific component (e.g., a signal processor) may be one or more, and the present application is not limited in any way. It should also be noted that, in the embodiments of the present application, no limitation is imposed on the types of the single boards included in the device, and the specific functional designs and numbers of the single boards.

It should be noted that the types and numbers of the plates specifically included in each apparatus may be different. For example: a network device that is a core node may not have a tributary board. A network device that is an edge node may have multiple tributary boards.

The technical concept involved in the embodiments of the present application will be explained below.

1) A network node, which may be referred to as a node for short, may also be referred to as a network device, such as an OTN device.

2) Data unit: consisting of an integer number of bytes or bits. The data unit may also be referred to as an optical service unit (OSUflex), an optical service data unit, an optical service unit, a payload code block, a payload block, a switch unit, or a switch code block, which is not specifically limited in this application. Fig. 3 shows a schematic diagram of a possible structure of a data unit. As shown in fig. 3, the data unit includes an overhead region and a payload region. Wherein the overhead may include, but is not limited to, at least one of: a service frame header indication, a Trail Trace Identifier (TTI), an X-Bit interleaved parity Bit-X (BIP-X), a Backward Error Indication (BEI), a Backward Defect Indication (BDI), a Status indication (Status, STAT), a timestamp, a sequence identifier, and a mapping overhead. The payload area is used for carrying service data. Illustratively, the data unit may be 8 bytes (B), 16B, 32B, 64B, 128B, 196B, 256B, 512B, or the like, which is not limited in this embodiment.

The embodiment of the present application also relates to a special data unit, which has no payload area, i.e. is not used for carrying services. For convenience of description, such special data units are referred to as overhead data units.

3) Data frame: the frame may be an OTN frame or a flexible Ethernet (FlexE) frame, and is used to carry various service data, and can implement management and monitoring on the service data. The OTN frame may be an Optical Data Unit (ODU) k, an ODUCn, an ODUflex, or an Optical Transport Unit (OTU) k, an OTUCn, or an Optical Payload Unit (OPU), or a flexible OTN (FlexO) frame, or the like. The data frame may also be other frame structures suitable for use in optical networks.

4) Data unit mapping to data frame: take the data frame as the OPU frame as an example. The OPU may contain an integer number of data units. Fig. 4 is a schematic structural diagram of a data unit mapped to a payload area of an OPU. The payload region of a single OPU frame is divided into I₄A number of data units, i.e. at most may have I₄A data unit is mapped into the OPU frame. For example, when the data unit size is 16 bytes, the payload area of one OPU frame may contain 952 data units. In addition, a plurality of OPU frames may be combined as one multiframe to perform data unit division. As shown in fig. 4, for example, when the size of a data unit is 192 bytes, three OPU frames constitute a multiframe to divide the data unit, and can carry 238 data units in total. When the multiplex service is mapped to the payload area of the OPU frame, its corresponding data units are mapped one by one to the data unit positions in the OPU frame.

The number of data units involved in the embodiments of the present application is for the service. The number of data units refers to the number of data units for carrying a service among the data units scheduled for one transmission period. For example, the payload area of the data frame has P consecutive data units as a transmission period. The number of data units in this embodiment is the number of data units used for carrying the service in the P data units. Taking the number of data units represented by C as an example, P data units can be transmitted in one transmission cycle, where C data units in the P data units are used to carry the service.

The client service data is mapped into a data unit, and a plurality of data units are mapped into a flexible tributary unit (TUflex). The TUflex may be composed of C Payload Blocks (PB), each payload block having a size of Y bytes, and usually one data unit corresponds to one payload block. Taking ODUk/Cn as an example, the payload area of ODUk/Cn takes continuous P payload blocks as one transmission cycle, where C payload blocks of TUflex occupy C of P payload blocks in each transmission cycle in the ODUk/Cn payload area.

5) The "plurality" in the embodiment of the present application means two or more. "and/or" describes the association relationship of the associated objects, meaning that three relationships may exist. For example, a and/or B, may represent: a exists alone, A and B exist simultaneously, and B exists alone. In addition, in the description of the present application, the terms "first," "second," and the like are used for descriptive purposes only and are not intended to indicate or imply relative importance nor order to be construed.

The method and the device are suitable for the scene of bandwidth adjustment without replacing the transmission path (namely the bandwidth adjustment of the transmission path). Specifically, the residual bandwidth of the original transmission path of the service data can meet the requirement of the changed service bandwidth, so that the path does not need to be changed, and then the bandwidth is adjusted. The adjustment here may be an increase or decrease in bandwidth.

The embodiment of the application is also suitable for the scene of bandwidth adjustment for replacing the transmission path. For example, the remaining bandwidth of the original transmission path of a certain service cannot meet the requirement of the target bandwidth of the service, that is, the target bandwidth of the service is higher than the bandwidth that can be provided by the original transmission path of the service. In the above scenario, a new transmission path may be established, and the bandwidth of the established new transmission path may meet the requirement of the target bandwidth of the service.

The embodiment of the application provides a bandwidth adjusting method and device, which adapt to bandwidth change of a client side service by adjusting the bandwidth of a data unit. For example, in a scenario of increasing bandwidth, in the embodiment of the present application, each network node adjusts bandwidth of a data channel of a service, and then a source node adjusts a mapping bandwidth of a service mapped to a data unit. For example, in a scenario of reducing bandwidth, in the embodiment of the present application, a source node first adjusts a mapping bandwidth of a service mapped to a data unit, and then each network node respectively adjusts a bandwidth of a data channel of the service.

When the network node adjusts the bandwidth of the data channel, the network node adjusts the bandwidth of the data channel involved in scheduling the data unit of the service, and does not involve adjusting the data channels of other network nodes.

The examples of the present application can be implemented by either of the following two embodiments: in the first embodiment, the original bandwidth of the service is adjusted to the target bandwidth required by the service through one adjustment. In the second embodiment, the original bandwidth of the service is adjusted to the target bandwidth required by the service by multiple adjustments.

The following describes a scheme of the embodiment of the present application in detail with reference to a scenario in which bandwidth adjustment is not required to change a transmission path. A transmission path of one traffic may include a source node (which may also be referred to as a head node), at least one intermediate node, and a sink node (which may also be referred to as a tail node). Each node on the transmission path may constitute a bandwidth adjustment system. Fig. 5 is a schematic diagram of a possible traffic transmission path. Fig. 5 illustrates an example in which the traffic is transmitted through NE1, NE2, NE3, and NE 4. NE1 is the source node of the transmission path of the service, NE4 is the sink node, and NE2 and NE3 are intermediate nodes.

In one possible example, the first embodiment is explained in the context of bandwidth adjustment with a transmission path. An end-to-end data channel is established for the service on the transmission path of the service, that is, the data channel of the service is established between the NE1 and the NE 4. When adjusting the bandwidth of a service, each node on the transmission path needs to adjust the bandwidth of a segment of channel involved in the node on the data channel for the service. The specific step of adjusting the data channel bandwidth may be implemented by a processor, a chip system, or a module with a processing function on the node.

Illustratively, each node may adjust the data channel bandwidth by:

a1, updating the number of data units according to the target bandwidth.

In determining the number of data units, it may be determined according to the target bandwidth and the bandwidth of one data unit. For example, the target bandwidth is BW, the bandwidth of the data unit is B, and the number of data units K is [ BW/B ]. When determining the number of data units, the number of increased data units may also be determined according to the increased bandwidth and the bandwidth of one data unit, and then the updated number of data units may be obtained by adding the number of increased data units to the number of data units before updating. Alternatively, the number of data units to be reduced is determined based on the reduced bandwidth and the bandwidth of one data unit, and then the number of data units to be reduced is subtracted from the number of data units before updating to obtain the updated number of data units.

A2, mapping the data units of the bearer service to the data frames according to the updated number of data units.

In the embodiment of the present application, the adjustment of the data channel bandwidth may also be to say, the adjustment of the number of the schedules of the data units when the node maps the data units of the service to the data frames.

The following describes the bandwidth adjustment scheme in the bandwidth increase scenario in detail with reference to fig. 5 and 6. When the bandwidth is increased, each node increases the bandwidth of the data channel according to the target bandwidth, and then the source node increases the bandwidth of the mapping of the service to the data unit. Fig. 6 is a flowchart illustrating a possible bandwidth increasing method according to an embodiment of the present application.

S601, the NE1 determines a target bandwidth required by the service, and increases the data path bandwidth according to the target bandwidth. The target bandwidth required by the service is larger than the current bandwidth of the service.

Specifically, when the data channel bandwidth is increased according to the target bandwidth, the data channel bandwidth may be increased by the above-mentioned a1 and a 2. NE1 may receive the target bandwidth required by the traffic sent by the controller when determining the target bandwidth required by the traffic.

S602, NE1 sends control information to NE 2. The control information is used to indicate that the number of data units is increased, or the control information is used to indicate that the data channel bandwidth is increased.

S603, after the NE2 receives the control information, the bandwidth of the data path is increased according to the target bandwidth.

S604, NE2 sends control information to the next hop network node (NE3) of NE 2.

S605, after the NE3 receives the control information, the NE3 increases the data path bandwidth according to the target bandwidth.

S606, NE3 sends control information to the next hop network node (i.e., NE 4).

It should be noted that, the two steps of increasing the bandwidth of the data channel according to the target bandwidth and sending the control information to the next-hop network node by the source node or the intermediate node may be performed simultaneously. Or, after the source node or the intermediate node performs the step of increasing the data channel bandwidth according to the target bandwidth, the control information may be sent to the next-hop network node. And after the source node or the intermediate node updates the number of the data units according to the target bandwidth, the control information can be sent to the next hop network node before the data units carrying the service are mapped to the data frames according to the updated number of the data units.

S607, NE4 receives the control information, and then increases the data path bandwidth according to the target bandwidth.

Illustratively, the target bandwidth may be configured by the controller for each network node on the transmission path. Or the controller configures a target bandwidth required by the service for the source node on the transmission path, and carries the target bandwidth in the control information when the source node sends the control information to the next-hop network node.

Optionally, when the controller configures a target bandwidth for each node on the transmission path, to improve reliability, the source node sends check information to the sink node before triggering execution of bandwidth adjustment. Wherein, the check information carries the target bandwidth. Further, when each node on the data channel receives the check information, whether the target bandwidth carried by the check information is consistent with the target bandwidth configured by the controller is determined. And sending check information to the next-hop network node after the consistency is confirmed. And when the sink node receives the check information, if the target bandwidth carried by the check information is determined to be consistent with the target bandwidth configured by the controller, sending a check confirmation to the source node through the transmission path or the controller. The check confirmation is used for indicating that each node on the transmission path determines that the target bandwidth in the check information is consistent with the adjustment parameter configured by the controller. If a certain network node of the transmission path determines that the target bandwidth carried by the check information is inconsistent with the target bandwidth configured by the controller, the check information can not be sent to the next-hop network node any more. Optionally, the network node may further send indication information to the source node through the transmission path or the controller, where the indication information indicates that the check fails. When the check fails, the bandwidth adjustment is not continuously executed.

S608, NE4 sends a confirmation message to NE 1. The acknowledgement information is used to indicate that the sink node has completed the update of the number of data units (or the acknowledgement information is used to indicate that the sink node has completed the increase of the data path bandwidth).

Illustratively, NE4 may send the acknowledgement information to the source node through at least one intermediate node. Alternatively, NE4 sends a confirmation to the controller, which then sends the confirmation to NE 1.

S609, after the NE1 receives the confirmation message, the NE1 adjusts the bandwidth of the service mapped to the data unit according to the target bandwidth.

Optionally, after the bandwidth adjustment is completed, connectivity detection may be performed. For example, the source node sends detection information to the sink node. And after receiving the detection information, the intermediate node sends the detection information to the next hop network node. And after receiving the detection information, the sink node sends a detection confirmation to the source node through the reverse direction of the transmission path or the controller. And after receiving the detection confirmation, the source node confirms that the source node is communicated with the destination node, and can continuously transmit the service.

As an example, the control information referred to herein may be encapsulated in one or more data units used to carry traffic. For example, the control information may carry overhead and/or payload regions of the data unit. As another example, the control information is encapsulated in an overhead data unit. An example of the overhead data unit is shown in fig. 10, and is not described herein.

The following describes the bandwidth adjustment scheme in the scenario of bandwidth reduction with reference to fig. 5 and 7. When the bandwidth is reduced, the bandwidth of the mapping from the service to the data unit is reduced by the source node, and then the reduction of the data channel bandwidth is performed by the source node, the intermediate node and the sink node in sequence. Fig. 7 is a flowchart illustrating a possible bandwidth reduction method according to an embodiment of the present application.

S701, NE1 adjusts the bandwidth of the traffic mapping to data units according to the target bandwidth.

S702, NE1 increases the data path bandwidth according to the target bandwidth.

S703, NE1 sends control information to NE 2. The control information is used to indicate that the number of data units is reduced, or the control information is used to indicate that the data channel bandwidth is reduced.

S704, after the NE2 receives the control information, the bandwidth of the data path is reduced according to the target bandwidth.

S705, NE2 sends control information to the next hop network node of NE2 (i.e., NE 3).

S706, after the NE3 receives the control information, the bandwidth of the data path is reduced according to the target bandwidth.

S707, NE3 sends control information to the next hop network node (i.e., NE 4).

S708, after the NE4 receives the control information, the bandwidth of the data path is reduced according to the target bandwidth.

S709, NE4 sends a confirmation message to NE 1. The acknowledgement information is used to indicate that the sink node has completed the update of the number of data units (or the acknowledgement information is used to indicate that the sink node has completed the reduction of the data lane bandwidth).

In another possible example, the second embodiment is described in the context of bandwidth adjustment of the same transmission path. And adjusting the original bandwidth of the service to the target bandwidth through multiple adjustments, and increasing or decreasing the bandwidth adjustment step length each time. When the bandwidth is increased, each node increases the bandwidth of the data channel for multiple times, and the bandwidth adjustment step length is increased each time until the original bandwidth of the service is increased to the target bandwidth. The bandwidth of the traffic to data unit mapping is then increased by the source node. When the bandwidth is reduced, the bandwidth of the service mapped to the data unit is reduced by the source node, and then the bandwidth of the data channel is reduced for a plurality of times by each node, and the bandwidth adjustment step length is reduced each time until the bandwidth is reduced to the target bandwidth.

Fig. 8 is a schematic flow chart of another possible bandwidth increasing method in the embodiment of the present application.

S801, the controller sends adjustment parameters for network nodes NE1, NE2, NE3, and NE4 on the transmission path. The adjustment parameters comprise target-BW Gbit/s and bandwidth adjustment step length (X Gbit/s) required by the service.

S802, NE1 performs the step of i-th tunnel bandwidth adjustment and sends control information to the next hop network node of NE1 (i.e., NE 2).

Wherein, the step of adjusting the channel bandwidth comprises:

b1, updating the number of data units according to the bandwidth adjustment step size.

For example, the channel bandwidth is adjusted to be bandwidth increased, the number of the increased data units can be determined according to the bandwidth adjustment step size and the bandwidth of the data units, and then, each time the number of the data units is updated according to the bandwidth adjustment step size, the number of the data units to be updated can be obtained by adding the current number of the data units to the number of the increased data units. For another example, the bandwidth that needs to be increased this time may be obtained according to the bandwidth of the data channel that is adjusted last time plus the bandwidth adjustment step length, and the number of data units to be updated may be obtained according to the bandwidth that needs to be increased this time and the bandwidth of the data units.

B2, mapping the data unit carrying the service to the data frame according to the updated data unit number.

S803, NE2, after receiving the control information, performs the step of i-th tunnel bandwidth adjustment, and sends the control information to the next-hop network node of NE2 (i.e. NE 3).

S804, NE3, after receiving the control information, performs the step of i-th tunnel bandwidth adjustment, and sends the control information to the next-hop network node of NE3 (i.e. NE 4).

S805, after receiving the control information, the NE4 executes the step of i-th path bandwidth adjustment.

In one mode, the interval between two adjacent times of sending the control information by the source node is a preset time length M ms. Specifically, after the source node sends the control information for the ith time, i is accumulated, the next channel bandwidth adjustment is executed at an interval of a preset time length of M ms, and the next hop network node is instructed to execute the channel bandwidth adjustment by sending the control information. For example, fig. 9 is a schematic diagram illustrating a correspondence relationship between a bandwidth increasing time and a bandwidth value after each bandwidth increase. Fig. 9 illustrates the case where the source node transmits the control information at T0 for the 1 st time. And stopping executing after the bandwidth of the channel is adjusted to the target bandwidth or the Nth channel bandwidth adjustment is finished.

In another mode, the sink node sends acknowledgement information to the source node after finishing channel bandwidth adjustment each time. And after receiving the confirmation information, the source node executes the next channel bandwidth adjustment and sends control information, and the execution is stopped until the bandwidth of the channel is adjusted to the target bandwidth or the Nth channel bandwidth adjustment is finished at the sink node.

As an example, the manner shown in table 1 may be employed when determining N.

TABLE 1

Where CEILING represents a rounding function.

Illustratively, at S806, NE4, after completing the nth adjustment of the tunnel bandwidth, may send acknowledgement information to NE1, where the acknowledgement information is used to indicate that the destination node has completed the nth adjustment of the tunnel bandwidth.

S807, after NE1 receives the confirmation information, it adjusts the bandwidth of the traffic mapping to the data unit according to the target bandwidth.

Illustratively, the sink node may determine that the bandwidth adjustment is completed N times by: one way is to determine that the number of times the control information is received reaches N times. The other mode is that the control information carries the current bandwidth adjustment times, the control information carrying times is determined to be N, and the current channel bandwidth adjustment is completed.

Illustratively, the adjustment parameters are carried in the control information. When the intermediate node and the sink node obtain the adjustment parameter, the adjustment parameter can be obtained from the control information sent by the previous hop network node.

As an example, the control information may be encapsulated in one or more data units used to carry traffic. For example, the control information may carry overhead and/or payload regions of the data unit. When the control information is carried in the overhead area of the data unit carrying the service, the payload area of the data unit can be filled with invalid data, and can also carry service data. As another example, the control information may also be encapsulated in an overhead data unit. Fig. 10 is a schematic diagram of an overhead data unit for encapsulating control information according to an embodiment of the present application. ADJ _ CNT in fig. 10 indicates the number of adjustments of the current bandwidth. The service number (Label) is used to indicate which service's data channel's bandwidth needs to be adjusted. REV denotes a version, PT denotes a cell Type, Type denotes an OAM Type, CHK denotes a check bit, EXT denotes an extension indication, CRC8 denotes a cyclic redundancy check, and res denotes a reserved bit. If the control information needs to carry the adjustment parameter, it can be carried in the res field, for example.

The scheme for bandwidth reduction is explained first. Fig. 11 is a flowchart illustrating a possible bandwidth reduction method according to an embodiment of the present application.

S1101, the controller sends adjustment parameters for network nodes NE1, NE2, NE3 and NE4 on the transmission path. The adjustment parameters comprise target-BW Gbit/s and bandwidth adjustment step length (X Gbit/s) required by the service.

S1102, adjusting the bandwidth of the service mapped to the data unit according to the target bandwidth.

S1103-S1107, see S802-S805.

The loop continues to execute S1103-S1107 until the channel bandwidth is reduced to the target bandwidth.

For example, when the number of data units is updated according to the bandwidth adjustment step, the channel bandwidth is adjusted to be bandwidth-reduced, the number of reduced data units may be determined according to the bandwidth adjustment step and the bandwidth of the data units, and then each time the number of data units is updated according to the bandwidth adjustment step, the number of data units to be updated may be obtained by subtracting the number of reduced data units from the current number of data units. For another example, the bandwidth required to be reduced may be obtained by subtracting the bandwidth adjustment step length from the bandwidth of the data channel adjusted last time, and the number of data units to be updated may be obtained according to the bandwidth required to be reduced and the bandwidth of the data units. Illustratively, the manner shown in Table 2 may be employed in determining N.

TABLE 2

In this embodiment, after the source node sends the control information for the ith time, i is accumulated, the next data channel bandwidth reduction is performed at an interval of a preset time duration M ms, and the control information is sent to indicate the next hop node to perform the data channel bandwidth reduction. Fig. 12 is a schematic diagram illustrating a correspondence relationship between data channel bandwidth reduction time and a bandwidth value after data channel bandwidth reduction in each time in an embodiment of the present application. Fig. 12 illustrates the case where the source node transmits control information at T0 for the 1 st time. And stopping executing after the source node determines that the bandwidth of the channel is reduced to the target bandwidth or determines that the sink node finishes the N-th time data channel bandwidth reduction.

In still another possible example, a bandwidth adjustment scheme in a scenario of bandwidth adjustment of a replacement transmission path is described. Referring to fig. 13, an original transmission path of traffic passes through NE1, NE2, NE3, and NE4 as an example. The bandwidth supported by the nodes of the path NE1 to NE4 cannot meet the target bandwidth to which traffic needs to be added. A new transmission path between the source node and the sink node can satisfy the target bandwidth required by the service, and fig. 13 exemplifies a transmission path formed by NE1, NE5, NE6, and NE 4. For convenience of description, the new transmission path is referred to as a first transmission path, and the original transmission path is referred to as a second transmission path. The data channel established on the first transmission path is referred to as a first data channel. The controller creates an end-to-end data channel on the second transmission path, which is referred to as a second data channel in this embodiment of the present application.

A first embodiment will be described below with reference to fig. 13 and 14, in which the bandwidth of the replacement transmission path increases. Specifically, the original bandwidth of the service is increased to the target bandwidth required by the service through one adjustment. Fig. 14 is a flowchart illustrating a bandwidth increasing method according to an embodiment of the present application.

S1401, the controller configures tuning parameters for network nodes NE1-NE6 on the first data channel and the second data channel. The adjustment parameters comprise target-BW Gbit/s and bandwidth adjustment step length (X Gbit/s) required by the service.

S1402, NE1 increases the bandwidth of the first data path on NE1 according to the target bandwidth, i.e. increases the bandwidth of the first data path on NE1 to the target bandwidth. Specific additions can be found in the aforementioned A1 and A2.

S1403, NE1 sends the first control information to the next hop network node of the first data tunnel (i.e., NE 5). The first control information is for instructing the NE5 to increase the bandwidth of the first data path.

S1404, NE5, after receiving the first control information, increases the bandwidth of the first data path on NE5 according to the target bandwidth, and sends the first control information to the next-hop network node (i.e., NE6) of NE5 on the first data path.

S1405, NE6 increases the bandwidth of the first data path on NE6 according to the target bandwidth and sends the first control information to the next-hop network node of NE6 (i.e. NE4) on the first data path.

S1406, NE4 increases the bandwidth of the first data tunnel on NE4 according to the target bandwidth, and sends to NE1 first confirmation information indicating that the sink node has completed the bandwidth increase of the first data tunnel.

S1407, after the NE1 receives the first confirmation message, the bandwidth of the second data channel on the NE1 is reduced to 0.

S1408, NE1 sends the second control information to the next hop network node of the second data channel (i.e., NE 2). The second control information is for instructing NE2 to reduce the bandwidth of the second data channel.

S1409, after NE2 receives the second control information, it reduces the bandwidth of the second data channel on NE2 to 0, and sends the second control information to the next-hop network node (i.e. NE3) of NE2 on the second data channel.

S1410, NE3 reduces the bandwidth of the second data tunnel at NE3 to 0 and sends the second control information to the next-hop network node of NE3 (i.e., NE4) on the second data tunnel.

S1411, NE4 reduces the bandwidth of the second data tunnel on NE4 to 0 and sends a second confirmation to NE1 indicating that NE4 has completed the bandwidth reduction of the second data tunnel.

S1412, after the NE1 receives the second confirmation information, the NE1 adjusts the bandwidth of the service mapped to the data unit according to the target bandwidth.

Through the method, the bandwidth of the first data channel is firstly increased to the target bandwidth, then the bandwidth of the second data channel is reduced to 0, namely the second data channel does not transmit the service any more, namely the service of the second data channel is migrated to the first data channel, and then the bandwidth of the service mapped to the data unit is increased.

Next, a second embodiment will be described with reference to fig. 13, in which the bandwidth of the replacement transmission path increases. Specifically, the original bandwidth of the service is increased to the target bandwidth required by the service through multiple adjustments.

C1, the controller sends tuning parameters for network nodes NE1-NE6 on the first data path and the second data path. The adjustment parameters comprise target-BW Gbit/s and bandwidth adjustment step length (X Gbit/s) required by the service.

And C2, adjusting the channel bandwidth alternately by each node on the two data channels, wherein each node on the first data channel increases the bandwidth on the first data channel by the bandwidth adjustment step length, and each node on the second data channel decreases the bandwidth on the second data channel by the bandwidth adjustment step length. When the channel bandwidth of each node on the second data channel decreases to zero, each node on the first data channel continues to increase the bandwidth on its first data channel until the bandwidth on the first data channel increases to the target bandwidth. And then the source node adjusts the bandwidth of the data unit mapped by the service according to the target bandwidth.

Fig. 15 is a schematic diagram of bandwidth adjustment in a scenario of changing transmission paths according to an embodiment of the present application. Fig. 15 is described in conjunction with the transmission path of fig. 13.

First, NE1 triggers the bandwidth of the first data channel to be increased once by the bandwidth adjustment step, i.e. NE1, NE5, NE6 and NE4 sequentially perform the bandwidth increase of their own first data channel. Steps S1501 to S1505 are specifically executed. Each time NE1 determines that NE4 completes the increase of the bandwidth of the first data channel, that is, each time it determines that the entire first transmission path completes the increase of the bandwidth of the first data channel or the entire second transmission path completes the decrease of the second data channel, the NE1 schedules the data unit of the service according to the increased bandwidth of the first data channel and the decreased bandwidth of the second data channel, and sends the data unit to the sink node through the first data channel and the second data channel.

Secondly, upon determining that NE4 has completed the increase of the bandwidth of its own first data channel once, NE1 triggers the bandwidth of the second data channel to be decreased by the bandwidth adjustment step, i.e. NE1, NE2, NE3 and NE4 sequentially perform the increase of the bandwidth of its own second data channel. Steps S1506-S1510 are specifically performed. And then proceeds to steps S1501 to S1505 and steps S1506 to S1510. Until the bandwidth of the second data channel on NE1, NE2, NE3, and NE4 is reduced to 0. Further, NE1, NE5, NE6 and NE4 continue to perform the increase of the bandwidth of their own first data tunnel, and may increase the bandwidth adjustment step each time until the bandwidth of the first data tunnel is increased to the target bandwidth. Then the source node executes S1511, and adjusts the bandwidth of the service mapped to the data unit to the target bandwidth according to the target bandwidth.

For example, the number of adjustments required to increase the bandwidth of the first data channel to the target bandwidth required by the service is N1. The number of adjustments required to reduce the bandwidth of the second data channel to zero is N2. The steps S1501-S1505 and steps S1506-S1510 loop through N2 times, i.e., the source node determines that the number of times the bandwidth of the second data channel is reduced reaches N2 or that the bandwidth of the second data channel is reduced to 0, and the source node triggers the continued execution of N1-N2 steps S1501-S1505. Alternatively, after steps S1501 to S1505 and steps S1506 to S1510 are performed cyclically N2 times, and then S1501 to S1505 are performed, the sending of the first acknowledgement information to the source node may not be performed when the sink node increases the bandwidth of the first data channel on the sink node according to the bandwidth adjustment step size. The source node may trigger performing the increase of the bandwidth of the first data channel every interval of a preset duration.

As an example, after the steps S1501 to S1505 and steps S1506 to S1510 are performed circularly N2 times, i.e. when the source node determines that the number of times of the second data channel bandwidth reduction reaches N2 or determines that the bandwidth of the second data channel is reduced to 0, the source node may trigger one adjustment to adjust the first data channel bandwidth to the target bandwidth.

Illustratively, when the bandwidth of the second data channel on NE1, NE2, NE3, and NE4 is all reduced to 0, the second data channel may be deleted. For example, when NE1 determines that the bandwidth of its second data channel is 0 or determines that the number of times NE1 performs bandwidth reduction of the second data channel is N2, the controller is notified and the second data channel is deleted by the controller.

S1501, NE1 increases the bandwidth of the first data path in NE1 according to the bandwidth adjustment step, that is, increases the bandwidth of the first data path in NE1 by the bandwidth adjustment step. Specific additions can be found in the aforementioned B1 and B2.

S1502, NE1 sends first control information to next hop network node NE5 of the first data tunnel. The first control information is for instructing the NE5 to increase the bandwidth of the first data path.

S1503, after NE5 receives the first control information, it increases the bandwidth of the first data tunnel on NE5 according to the target bandwidth, and sends the first control information to the next-hop network node (i.e., NE6) of NE5 on the first data tunnel.

S1504, NE6 increases the bandwidth of the first data tunnel on NE6 according to the bandwidth adjustment step size, and sends the first control information to the next-hop network node of NE6 (i.e. NE4) on the first data tunnel.

S1505, NE4 increases the bandwidth of the first data path on NE4 according to the bandwidth adjustment step size, and sends first acknowledgement information to NE1, the first acknowledgement information being used for indicating that the sink node has completed the bandwidth increase of the first data path.

S1506, after the NE1 receives the first confirmation information, the bandwidth of the second data channel on the NE1 is reduced according to the bandwidth adjustment step size.

S1507, NE1 sends second control information to next hop network node NE2 of the second data channel. The second control information is for instructing NE2 to reduce the bandwidth of the second data channel.

S1508, after NE2 receives the second control information, it reduces the bandwidth of the second data channel on NE2 according to the bandwidth adjustment step size, and sends the second control information to next-hop network node NE3 of NE2 on the second data channel.

S1509, NE3 reduces the bandwidth of the second data channel on NE3 according to the bandwidth adjustment step size, and transmits the second control information to the next-hop network node of NE3 (i.e., NE4) on the second data channel.

S1510, NE4 reduces the bandwidth of the second data channel on NE4 according to the bandwidth adjustment step size, and sends to NE1 second confirmation information indicating that sink node NE4 has completed the bandwidth reduction of the second data channel.

S1511, the NE1 adjusts the bandwidth of the traffic mapped to the data unit to the target bandwidth according to the target bandwidth.

Illustratively, the NE1, after receiving the adjustment parameter sent by the controller, may determine the number of adjustments N1 required to increase the bandwidth of the first data channel to the target bandwidth according to the target bandwidth and the bandwidth adjustment step size. Similarly, the adjustment number N2 required for the bandwidth of the second data channel to decrease to zero may be determined according to the bandwidth of the second data channel before the adjustment and the bandwidth adjustment step size. Further, NE1 carries the current number of bandwidth adjustments (which may be increases or decreases) in the control information (first and second control information) sent to the next hop node. For example, if NE1 sends the first control information to NE2 the 1 st time, the first control information may carry the current bandwidth increase number of times as 1. For another example, if NE1 sends the second control information to NE5 for the 2 nd time, the second control information may carry the current bandwidth increase number of times of 2. The first control information or the second control information may be encapsulated in one or more data units carrying services, and for a specific method, reference is made to the embodiment corresponding to fig. 11, which is not described herein again.

Optionally, when the controller configures the adjustment parameter for each node on the first data channel and the second data channel, in order to improve reliability, the source node sends, before triggering execution of the bandwidth adjustment, the check information to the sink node through the first data channel, and sends the check information to the sink node through the second data channel. The verification information includes adjustment parameters. And the node on the first data channel and the node on the second data channel respectively verify whether the adjusting parameter in the verification information is consistent with the adjusting parameter configured by the controller. When the sink node receives the check information through the first data channel, if the target bandwidth carried by the check information is determined to be consistent with the target bandwidth configured by the controller, a first check confirmation can be sent to the source node through the first transmission path or the controller. The first check confirmation is used for indicating that each node on the first data channel determines that the adjusting parameters in the check information are consistent with the adjusting parameters configured by the controller. And when the sink node receives the check information through the second data channel, if the target bandwidth carried by the check information is determined to be consistent with the target bandwidth configured by the controller, sending a second check confirmation to the source node through the second transmission path or the controller. The second check-up confirmation is used to indicate that each node on the second data channel has determined that the adjustment parameters in the check-up information are consistent with the adjustment parameters configured by the controller.

For example, to reduce the resource waste, if a certain node is on both the first data channel and the second data channel, only the check information on the first data channel or the check information on the second data channel may be checked.

Optionally, after completing the bandwidth adjustment, connectivity detection may be performed, for example, the source node may send detection information to the sink node along the first data channel, the intermediate node does not process the detection information, and directly sends the detection information to the next-hop network node after receiving the detection information, and the sink node sends a detection acknowledgement to the source node through a reverse direction of a transmission path of the first data channel or the controller after receiving the detection information. And after receiving the detection confirmation, the source node confirms that the source node is communicated with the destination node, and can continuously transmit the service.

Based on the same inventive concept as the above embodiments, the embodiments of the present application further provide a bandwidth adjusting apparatus. The method, the device and the system are based on the same inventive concept, and because the principles of solving the problems of the method, the device and the system are similar, the implementation of the device and the method can be mutually referred, and repeated parts are not repeated.

The apparatus may be used in a network node (source node, intermediate node, or sink node) for performing the method performed by the source node, intermediate node, or sink node in any of the above embodiments. The apparatus may specifically be a processor, a chip system, or a module in the processor for executing the function of the transmitting end. The device may be implemented by the bypass board and/or the circuit board of fig. 2. Fig. 16 is a schematic structural diagram of a possible bandwidth adjusting apparatus in an embodiment of the present application. As shown in fig. 16, the apparatus includes a determining unit 1601, a channel bandwidth adjusting unit 1602, and a transmitting unit 1603.

In one example, the above apparatus is applied to a source node, the determining unit 1601 is configured to determine an adjustment parameter, and the channel bandwidth adjusting unit 1602 is configured to perform a step of channel bandwidth adjustment. The transmitting unit 1603 is used to transmit control information. The sending unit 1603 is also used for sending verification information or detection information.

In another example, the apparatus described above is applied to an intermediate node. The determining unit 1601 is configured to determine an adjustment parameter, and the channel bandwidth adjusting unit 1602 is configured to perform a step of channel bandwidth adjustment and further configured to perform adjustment of mapping bandwidth of traffic to data units. The transmitting unit 1603 is used to transmit control information. The sending unit 1603 is also used for sending verification information or detection information. The apparatus may further include a verification unit (not shown in fig. 16) for verifying the verification information.

In yet another example, the apparatus described above is applied to an intermediate node. The determining unit 1601 is configured to determine an adjustment parameter, and the channel bandwidth adjusting unit 1602 is configured to perform a step of channel bandwidth adjustment. The transmitting unit 1603 is used to transmit control information. The sending unit 1603 is also used for sending confirmation information or check confirmation. The apparatus may further include a verification unit (not shown in fig. 16) for verifying the verification information.

Optionally, the three units may also perform other relevant optional steps performed by the source node, the intermediate node, or the sink node mentioned in any of the foregoing embodiments, and details are not described here again.

The division of the unit in the embodiment of the present application is schematic, and is only a logic function division, and there may be another division manner in actual implementation. In addition, functional units in the embodiments of the present application may be integrated into one processor, may exist alone physically, or may be integrated into one unit from two or more units. The integrated unit can be realized in a form of hardware, and can also be realized in a form of a software functional unit.

Fig. 17 is a schematic structural diagram of another possible data transmission apparatus according to an embodiment of the present application. As shown in fig. 17, apparatus 1700 includes a communication interface 1710, a processor 1720, and a memory 1730. The apparatus may be applied to a source node, an intermediate node, or a sink node.

The determining unit 1601, the channel bandwidth adjusting unit 1602, and the transmitting unit 1603 shown in fig. 16 may be implemented by the processor 1720. Illustratively, the processor 1702 may be a signal processor in the tributary board and/or a signal processor in the line board shown in fig. 2. Processor 1720 receives traffic data via communication interface 1710 and is configured to implement the methods performed by the source node, intermediate node, or sink node in fig. 6-8, 11, 14, and 15. In implementation, the steps of the process flow may implement the method performed by the source node, intermediate node, or sink node in fig. 6-8, 11, 14, 15 by instructions in the form of integrated logic circuits of hardware or software in the processor 1720.

In the illustrated embodiment, the communication interface 1710 may be a circuit, a bus, a transceiver, or any other device that can be used for information interaction. The other apparatus may be a device connected to the apparatus 1700, for example, when the apparatus is a source node, the other apparatus may be an intermediate node, and when the apparatus is an intermediate node, the other apparatus may be a source node, another intermediate node, or a sink node.

In particular, processor 1720 may be a general purpose processor, a digital signal processor, an application specific integrated circuit, a field programmable gate array or other programmable logic device, discrete gate or transistor logic, discrete hardware components. A general purpose processor may be a microprocessor or any conventional processor or the like. The steps of a method disclosed in connection with the embodiments of the present application may be embodied directly in a hardware processor, or in a combination of hardware and software elements in the processor. Program code executed by processor 1720 to implement the above-described methods may be stored in memory 1730. Memory 1730 is coupled with processor 1720. The coupling in the embodiments of the present application is an indirect coupling or a communication connection between devices, units or modules, and may be an electrical, mechanical or other form for information interaction between the devices, units or modules. Processor 1720 may operate in conjunction with memory 1730. The memory 1730 may be a nonvolatile memory such as a Hard Disk Drive (HDD) or a solid-state drive (SSD), and may also be a volatile memory (RAM), for example, a random-access memory (RAM). The memory 1730 is any other medium that can be used to carry or store desired program code in the form of instructions or data structures and that can be accessed by a computer, but is not limited to such.

The specific connection media between the communication interface 1710, the processor 1720, and the memory 1730 are not limited in this embodiment. In fig. 17, the memory 1730, the processor 1720, and the communication interface 1710 are connected by a bus. The bus lines are shown in fig. 13 as thick lines, and the connection form between other components is merely illustrative and not limited. The bus may be divided into an address bus, a data bus, a control bus, etc. For ease of illustration, only one thick line is shown in FIG. 13, but this is not intended to represent only one bus or type of bus.

Based on the above embodiments, the present application further provides a computer storage medium, in which a software program is stored, and the software program can implement the method provided by any one or more of the above embodiments when being read and executed by one or more processors. The computer storage medium may include: u disk, removable hard disk, read only memory, random access memory, etc. may be used to store the program code.

Based on the above embodiment, the embodiment of the application also provides a chip. The chip comprises a processor for performing the functions according to any one or more of the embodiments described above, such as acquiring or processing the data frames according to the methods described above. Optionally, the chip further comprises a memory for the processor to execute the necessary program instructions and data. The chip may be constituted by a chip, or may include a chip and other discrete devices.

As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.

The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.

These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks. These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.

It will be apparent to those skilled in the art that various changes and modifications may be made in the embodiments of the present application without departing from the scope of the embodiments of the present application. Thus, if such modifications and variations of the embodiments of the present application fall within the scope of the claims of the present application and their equivalents, the present application is also intended to encompass such modifications and variations.

Claims

1. A method for bandwidth adjustment, the method being applied to a first network node, and comprising:

determining a target bandwidth required by a service;

updating the number of data units according to the target bandwidth, wherein the number of the data units is the number of the data units used for bearing the service in the number units scheduled in one transmission period;

and mapping the data unit bearing the service to a data frame according to the updated data unit quantity.

2. The method of claim 1, wherein the first network node is a source node or an intermediate node on a transmission path of the traffic, the method further comprising:

and sending control information to the second network node, wherein the control information is used for indicating to update the number of the data units, and the second network node is a next hop network node of the first network node on the transmission path.

3. The method of claim 2, wherein the target bandwidth is higher than the bandwidth of the traffic before the adjusting, and the first network node is a source node on a transmission path of the traffic, further comprising:

after sending control information to the second network node, receiving acknowledgement information, where the acknowledgement information is used to indicate that a sink node on a transmission path of the traffic has completed updating the number of data units, and the acknowledgement information is from the second network node or from a controller;

and adjusting the bandwidth of the service mapping to the data unit according to the target bandwidth.

4. The method of claim 1 or 2, wherein the target bandwidth is lower than the bandwidth of the traffic before the adjusting, and the first network node is a source node on a transmission path of the traffic, further comprising: and adjusting the bandwidth of the service mapping to the data unit according to the target bandwidth before updating the number of the data unit according to the target bandwidth.

5. The method of any of claims 1-4, wherein the determining the target bandwidth required for the service comprises: and receiving the target bandwidth sent by the controller.

6. The method of claim 5, wherein the first network node is a source node on a transmission path of the traffic, further comprising:

after receiving the target bandwidth sent by the controller, before updating the number of data units according to the target bandwidth, sending check information to a host node of the transmission path through a transmission path of the service, wherein the check information carries the target bandwidth, and the check information is used for indicating a node on the transmission path to verify whether the received adjustment parameter is consistent with an adjustment parameter configured by the controller;

and receiving a check confirmation, wherein the check confirmation is used for indicating each node on the transmission path to check that the target bandwidth in the received check information is consistent with the target bandwidth configured by the controller.

7. The method of claim 1, wherein the first network node is a sink node on a transmission path of the traffic, the method further comprising: after updating the number of the data units, sending acknowledgement information to a source node of the transmission path, where the acknowledgement information is used to indicate that the sink node has completed updating the number of the data units.

8. A method according to any of claims 2-7, wherein the control information is encapsulated in data units used to carry the traffic.

9. The method of any of claims 2-7, wherein the control information is encapsulated in a data unit for carrying overhead.

10. A method for bandwidth adjustment, the method being applied to a first network node, and comprising:

determining a bandwidth adjustment step length, wherein the bandwidth adjustment step length is the bandwidth which is increased or decreased each time when the target bandwidth required by the service is adjusted for N times, and N is an integer which is more than 1;

and circularly executing the following bandwidth adjustment steps for N times:

updating the number of data units according to the bandwidth adjustment step length, wherein the number of the data units is the number of the data units used for bearing the service in the data units scheduled in one transmission period; and mapping the data unit bearing the service to a data frame according to the updated number of the data units.

11. The method of claim 10, wherein the first network node is a source node on a transmission path of the traffic, further comprising: and after updating the number of the data units each time, sending control information to a next hop network node of the first network node, wherein the control information is used for indicating to update the number of the data units.

12. The method of claim 11, wherein the target bandwidth is higher than the bandwidth of the traffic before the adjusting, the method further comprising:

receiving acknowledgement information, where the acknowledgement information is used to indicate that a sink node on a transmission path of the traffic has completed updating the number of data units for the nth time, and the acknowledgement information is from a next-hop network node of the first network node or from the controller;

13. The method of claim 10 or 11, wherein the target bandwidth is lower than the bandwidth of the traffic before the adjusting, the method further comprising: adjusting the bandwidth of the traffic mapping to the data units according to the target bandwidth before performing the step of bandwidth adjustment.

14. The method of any of claims 10-13, wherein the determining a bandwidth adjustment step size comprises: and receiving an adjusting parameter sent by a controller, wherein the adjusting parameter comprises the bandwidth adjusting step length.

15. The method of claim 14, wherein the adjustment parameter further comprises the target bandwidth, the method further comprising: and determining the N according to the target bandwidth and the bandwidth adjustment step length.

16. The method of claim 14 or 15, further comprising:

after receiving the adjustment parameter sent by the controller and before executing the first bandwidth adjustment, sending check information to a host node of the transmission path through the transmission path of the service, where the check information carries the adjustment parameter, and the check information is used to indicate whether the received adjustment parameter is consistent with the adjustment parameter configured by the controller;

and receiving a check confirmation, wherein the check confirmation is used for indicating each node on the transmission path to check that the adjustment parameters in the received check information are consistent with the adjustment parameters configured by the controller.

17. A method according to any of claims 11-16, wherein the control information is encapsulated in data units used to carry the traffic.

18. The method of any of claims 11-16, wherein the control information is encapsulated in a data unit for carrying overhead.

19. A bandwidth adjustment method is applied to a scenario that a second data channel for transmitting traffic between a source node and a sink node is switched to a first data channel, and comprises the following steps:

the source node adjusts the step length according to the configured first bandwidth, executes the ith increase of the bandwidth of the first data channel, and sends first control information to the first network node; wherein the first network node is a next-hop network node of the source node on the first data channel, and the first control information is used to instruct the first network node to increase the bandwidth of the first data channel;

when the condition that the bandwidth of the second data channel is larger than zero is met, the source node determines to receive first confirmation information from the host node, performs j-th reduction on the bandwidth of the second data channel according to a configured second bandwidth adjustment step length, and sends second control information to a second network node; wherein the second network node is a next-hop network node of the source node on the second data channel, the first acknowledgement information is used to indicate that the sink node has completed the ith increase of the bandwidth of the first data channel, and the second control information is used to indicate that the second network node decreases the bandwidth of the second data channel;

the source node receiving second acknowledgement information from the sink node, the second acknowledgement information indicating that the sink node has completed the j-th reduction in bandwidth of the second data channel; wherein, the second bandwidth adjustment step is smaller than or equal to the first bandwidth adjustment step, i is taken over by a positive integer smaller than or equal to N1, N1 is the adjustment number of times required to increase the bandwidth of the first data channel to the target bandwidth required by the service, j is taken over by a positive integer smaller than or equal to N2, N2 is the adjustment number of times required to decrease the bandwidth of the second data channel from the bandwidth of the service before adjustment to zero, and N1 is greater than N2.

20. The method of claim 19, wherein the method further comprises:

and when the source node determines that the sink node completes the N1 th increase of the bandwidth of the first data channel, adjusting the rate of mapping the service to the data unit of the service according to the target bandwidth required by the service.

21. The method of claim 19 or 20, wherein the method further comprises:

the source node receives an adjustment parameter sent by a controller, wherein the adjustment parameter comprises the bandwidth adjustment step length and a target bandwidth required by the service;

and the source node determines the N1 according to the target bandwidth and the bandwidth adjusting step size, and determines the N2 according to the bandwidth of the service before adjustment and the bandwidth adjusting step size.

22. The method of claim 21, wherein the method further comprises:

after the source node receives the adjustment parameter, before performing bandwidth adjustment of the service, sending check information to the sink node through a first data channel, and sending the check information to the sink node through a second data channel, where the check information includes the adjustment parameter, and the check information is used to indicate whether the adjustment parameter in the check information is consistent with the adjustment parameter configured by the controller or not;

the source node receives a first check confirmation sent by the first network node, where the first check confirmation is used to indicate that each node on the first data channel has determined that an adjustment parameter in the check information is consistent with an adjustment parameter configured by the controller;

and the source node receives a second check confirmation sent by the second network node, wherein the second check confirmation is used for indicating that each node on the second data channel determines that the adjustment parameters in the check information are consistent with the adjustment parameters configured by the controller.

23. A method according to any of claims 20-22, wherein the first control information is encapsulated in a data unit for carrying the service or the second control information is encapsulated in a data unit for carrying the service.

24. The method of any of claims 20-22, wherein the first control information is encapsulated in a data unit for bearer overhead or the second control information is encapsulated in a data unit for bearer overhead.

25. An apparatus comprising a processor and a memory, wherein:

the memory for storing program code;

the processor is configured to read and execute the program code stored in the memory to implement the method of any one of claims 1-9 or 10-18 or 19-24.

26. A chip, wherein the chip is connected to a memory for reading and executing program code stored in the memory to implement the method of any one of claims 1-9, 10-18 or 19-24.