CN114866425B - Method and device for adjusting bandwidth of optical service unit connection - Google Patents
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Abstract
The application provides a method and a device for adjusting the bandwidth of optical service unit connection. The method comprises the following steps: determining whether the optical transport network is unobstructed in response to determining that the bandwidth needs to be increased according to traffic information observed in the optical transport network; in response to determining that the optical transport network is clear, sending a first request to a plurality of network devices on the optical transport network indicating to increase the bandwidth in a first mode; in response to determining that the optical transport network is not clear, a second request is sent to the plurality of network devices indicating to increase the bandwidth in a second mode.
Description
Technical Field
The present application relates to the field of optical communications technologies, and in particular, to a method for adjusting a bandwidth of an optical service unit connection.
Background
Optical Transport Networks (OTNs) are the best choice for dedicated traffic for large bandwidth and hard pipe requirements because of their advantages of security, low latency, low jitter, high reliability, etc.
With the increase of the demands of government and enterprise professional services, the industry is always exploring and researching whether a technology can be used for combining the characteristics of high safety and high reliability, and meanwhile, the technology of an Optical Service Unit (OSU) for the service can be developed. One of the advantages of the optical service unit technology is that the second-level lossless bandwidth adjustment can be realized, and the problems of resource waste, insufficient flexibility and the like caused by bandwidth mismatch are solved.
The bandwidth adjustment method in the prior art is single, and cannot adjust the bandwidth adjustment rate and efficiency according to the resource condition of the network equipment.
Disclosure of Invention
In view of the above, the present application is directed to a method and an apparatus for adjusting the bandwidth of an optical service unit connection.
In view of the above object, one or more embodiments of the present application provide a method for adjusting a bandwidth of an optical service unit connection, including:
determining whether the optical transport network is unobstructed in response to determining that the bandwidth needs to be increased according to traffic information observed in the optical transport network;
in response to determining that the optical transport network is clear, sending a first request to a plurality of network devices on the optical transport network indicating to increase the bandwidth in a first mode;
in response to determining that the optical transport network is not clear, a second request is sent to the plurality of network devices indicating to increase the bandwidth in a second mode.
Optionally, the first mode comprises an exponential growth mode and the second mode comprises a linear growth mode.
Optionally, determining whether the optical transport network is clear comprises:
determining that the optical transport network is clear in response to determining that the current value of the bandwidth is less than a congestion threshold;
and determining that the optical transport network is not unobstructed in response to determining that the current value of the bandwidth is not less than the congestion threshold.
Optionally, the method further comprises:
after receiving first response signals which are returned by the plurality of network devices and respectively respond to the first requests and indicate that the bandwidth adjustment is successful, determining that the bandwidth adjustment is completed;
and after receiving a second response signal which is returned by at least one network device in the plurality of network devices and is used for indicating that bandwidth adjustment fails in response to the first request, retransmitting the second request to the plurality of network devices.
Optionally, the method further comprises:
after receiving a third response signal which is returned by the plurality of network devices and indicates that the bandwidth adjustment is successful and is respectively responded to the second request, determining that the bandwidth adjustment is completed;
after receiving a fourth response signal indicating that bandwidth adjustment fails, which is returned by at least one network device in the plurality of network devices in response to the second request, updating the congestion threshold to the current value of the bandwidth, and ending the bandwidth adjustment.
Optionally, the method further comprises:
in response to determining that the bandwidth needs to be reduced according to the traffic information, a third request is sent to the plurality of network devices indicating that the bandwidth is reduced in a third mode.
The third mode includes a linear reduction mode.
Optionally, determining that the bandwidth needs to be increased according to the traffic information includes:
predicting bandwidth requirements in the next time period according to the flow information;
and determining that the bandwidth needs to be increased according to the bandwidth requirement and the current value of the bandwidth.
Based on the same inventive concept, one or more embodiments of the present application further provide an apparatus for adjusting a bandwidth of an optical service unit connection, including:
a determination module configured to: determining whether the optical transport network is unobstructed in response to determining that an increase in bandwidth of the optical service unit connection is required according to traffic information observed in the optical transport network;
a decision module configured to: responsive to the determination module determining that the optical transport network is clear, sending a first request to a plurality of network devices on the optical transport network indicating to increase the bandwidth in a first mode; in response to the determination module determining that the optical transport network is not clear, a second request is sent to the plurality of network devices indicating to increase the bandwidth in a second mode.
Optionally, the first mode comprises an exponential growth mode and the second mode comprises a linear growth mode.
From the foregoing, it can be seen that the method for adjusting bandwidth of an optical service unit connection provided by the present application responds to different traffic conditions of an optical transport network, and sends an instruction to a plurality of network devices on the optical transport network to complete bandwidth adjustment requests in different adjustment modes. One of the advantages of the optical service unit technology is that the second-level lossless bandwidth adjustment can be realized, the generation of the bandwidth adjustment request according to the flow monitoring result is the key for realizing the lossless bandwidth adjustment of the optical service unit, and the lossless bandwidth adjustment is the key for the optical transmission network technology based on the optical service unit. For the optical transport network based on the optical service unit technology, by adopting the multi-mode bandwidth adjustment method, network resources can be more effectively utilized and network services can be provided for clients.
Drawings
In order to more clearly illustrate the technical solutions of the present application or related art, the drawings that are required to be used in the description of the embodiments or related art will be briefly described below, and it is apparent that the drawings in the following description are only embodiments of the present application, and other drawings may be obtained according to the drawings without inventive effort to those of ordinary skill in the art.
Fig. 1 is a flow diagram of a method of adjusting bandwidth of an optical service unit connection according to one or more embodiments of the present application;
fig. 2 is a schematic diagram of a judgment flow of a method for adjusting bandwidth of an optical service unit connection according to an embodiment of the present application;
fig. 3 is a schematic diagram of an adjustment procedure of a method for adjusting bandwidth of an optical service unit connection according to an embodiment of the present application;
fig. 4 is a schematic diagram of an apparatus for adjusting bandwidth of an optical service unit connection according to one or more embodiments of the present application.
Detailed Description
The present application will be further described in detail below with reference to specific embodiments and with reference to the accompanying drawings, in order to make the objects, technical solutions and advantages of the present application more apparent.
It should be noted that unless otherwise defined, technical or scientific terms used in the embodiments of the present application should be given the ordinary meaning as understood by one of ordinary skill in the art to which the present application belongs. The terms "first," "second," and the like, as used in embodiments of the present application, do not denote any order, quantity, or importance, but rather are used to distinguish one element from another. The word "comprising" or "comprises", and the like, means that elements or items preceding the word are included in the element or item listed after the word and equivalents thereof, but does not exclude other elements or items. The terms "connected" or "connected," and the like, are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "upper", "lower", "left", "right", etc. are used merely to indicate relative positional relationships, which may also be changed when the absolute position of the object to be described is changed.
As described in the background section, optical Transport Networks (OTNs) are the best choice for dedicated traffic for large bandwidth and hard pipe requirements because of their advantages of security, low latency, low jitter, high reliability, etc. Optical transport networks have also evolved from an infrastructure network for internal networking applications to a carrier network for private line services.
However, in the hard pipeline dedicated scheme of the optical transmission network adopted in the prior art, the bandwidth is not shared by putting the service into independent optical collecting and distributing unit (ODUk) channels, i.e. physical isolation is performed between the ODUk channels. Under such circumstances, the optical transport network cannot take account of the small-particle dedicated line load, and the conventional pure hard pipeline technology is also difficult to adapt to the current dynamic adjustment requirement of the network bandwidth of the customer. Therefore, the industry is always exploring and researching whether a technology can be used for combining the characteristics of high safety and high reliability and collecting and editing the special line service of large and small particles.
As the demand for government and enterprise specialized businesses grows, business oriented Optical Service Unit (OSU) technology has grown. One of the advantages of the optical service unit technology is that the second-level lossless bandwidth adjustment can be realized, bandwidth resources are efficiently utilized, and the problems of resource waste, insufficient flexibility and the like caused by bandwidth mismatch are solved.
However, the bandwidth adjustment method in the prior art is single, and cannot adjust the bandwidth adjustment rate and efficiency in real time according to the resource condition of the network device.
In view of the foregoing, one or more embodiments of the present application provide a method of adjusting a bandwidth of an optical service unit connection, in response to determining that the optical transport network is clear, sending a first request to a plurality of network devices on the optical transport network indicating to increase the bandwidth in a first mode; in response to determining that the optical transport network is not clear, a second request is sent to the plurality of network devices indicating to increase the bandwidth in a second mode. Namely, a bandwidth adjustment request decision method based on service requirements is provided to realize flexible adjustment of the OSU connection bandwidth.
The technical solutions of one or more embodiments of the present specification are described in detail below by means of specific embodiments.
Referring to fig. 1, a method for adjusting bandwidth of an optical service unit connection according to an embodiment of the present disclosure includes the following steps:
step S101, in response to determining that the bandwidth needs to be increased according to traffic information observed in the optical transport network, determining whether the optical transport network is unobstructed.
In this step, it is first determined whether the bandwidth needs to be increased according to the observed traffic information in the optical transport network.
In some embodiments, according to real-time flow information observed by the flow monitoring software sFlow, data packets passing through the device are sampled, analyzed and counted to obtain a bandwidth demand value, so as to determine whether the bandwidth needs to be increased.
In response to determining that bandwidth needs to be reduced, a third request is sent to the plurality of network devices indicating that the bandwidth is reduced in a third mode. In some embodiments, a request for adjustment of a linear reduction mode is sent to the plurality of network devices.
And in response to determining that the bandwidth needs to be increased, comparing the current value of the bandwidth with a congestion threshold, and judging whether the optical transport network is smooth or not.
Step S102, in response to determining that the optical transport network is clear, sends a first request to a plurality of network devices on the optical transport network indicating to increase the bandwidth in a first mode.
In this step, the optical transport network is determined to be unobstructed in response to determining that the current value of bandwidth is less than a congestion threshold. A first request is sent to a plurality of network devices on the optical transport network indicating to increase the bandwidth in a first mode. In some embodiments, an exponentially growing pattern of adjustment requests is sent to a plurality of network devices on the optical transport network.
And after receiving first response signals which are returned by the plurality of network devices respectively in response to the first requests and indicate that the bandwidth adjustment is successful, determining that the bandwidth adjustment is completed. In some embodiments, the adjustment success is determined in response to the first response signal.
And after receiving a second response signal which is returned by at least one network device in the plurality of network devices and is used for indicating that bandwidth adjustment fails in response to the first request, retransmitting the second request to the plurality of network devices. In some embodiments, the adjustment request for the linearly increasing mode is resent to the network device in response to the second response signal determining that the adjustment failed.
In implementing the present disclosure, the inventor found that the traffic information of the network is in a change, if the bandwidth adjustment is performed according to the data rate observed at the current time, only the traffic demand in the interval from the current time to the past time can be satisfied, and the time from the next bandwidth adjustment to the next time is still a period of time, and the current bandwidth adjustment result is difficult to satisfy the traffic demand in the interval from the current time to the future time t.
Thus, in some embodiments, the inventors propose an algorithm to calculate the target demand value. An adjustment request applied to an exponential growth mode, the algorithm formula is b=2b i Wherein B is i Is the current bandwidth value; adjustment request applied to linear growth mode, the algorithm formula is b=b i +λ i Whereint is the bandwidth adjustment interval duration, B i For the current bandwidth value, B i-1 Is the bandwidth value at the last time.
Step S103, in response to determining that the optical transport network is not clear, sending a second request to the plurality of network devices indicating to increase the bandwidth in a second mode.
In this step, it is determined that the optical transport network is not unobstructed in response to determining that the current value of bandwidth is greater than a congestion threshold. A second request is sent to the plurality of network devices indicating to increase the bandwidth in a second mode. In some embodiments, a request for adjustment of a linear growth mode is sent to a plurality of network devices on the optical transport network.
And after receiving third response signals which are returned by the plurality of network devices respectively in response to the second request and indicate that the bandwidth adjustment is successful, determining that the bandwidth adjustment is completed. In some embodiments, the adjustment is determined to be successful in response to the success signal, the current bandwidth adjustment effort is determined, and the current bandwidth adjustment is ended.
After receiving a fourth response signal indicating that bandwidth adjustment fails, which is returned by at least one network device in the plurality of network devices in response to the second request, updating the congestion threshold to the current value of the bandwidth, and ending the bandwidth adjustment. In some embodiments, the congestion threshold is updated to the current value of the bandwidth in response to a failure signal determining that the adjustment failed, and the current bandwidth adjustment is ended.
The following describes in further detail, by means of specific embodiments, the technical solution of the present application in response to a determination that an increase of said bandwidth is required.
Referring first to fig. 2, it is first determined whether the current value of the bandwidth is less than the congestion threshold.
Responsive to determining that the current value of bandwidth is less than the congestion threshold, determining that the optical transport network is unobstructed, sending an exponentially growing pattern adjustment request to a plurality of network devices on the optical transport network. After receiving the successful adjustment signal returned by the equipment, stopping the adjustment work; and after receiving the device return adjustment failure signal, retransmitting the adjustment request of the linear growth mode to a plurality of network devices on the optical transmission network.
And in response to determining that the current value of the bandwidth is greater than the congestion threshold, determining that the optical transport network is not smooth, and sending a linearly increasing mode adjustment request to a plurality of network devices on the optical transport network when the device adjustment failure signal is received. After receiving the successful adjustment signal returned by the equipment, stopping the adjustment work; after receiving the adjustment failure signal returned by the equipment, updating the congestion threshold value to be the current value of the bandwidth, and stopping the adjustment work.
The technical scheme of the application is further described in detail through another specific embodiment.
First, referring to fig. 3, the semantic code transmission method provided by the present application includes the following steps:
according to the observed flow information, the bandwidth demand value is always increased before the 10 th time of bandwidth adjustment; after the 10 th adjustment, the bandwidth demand value continues to decrease. And obtaining the value of the broadband of the 1 st adjustment round as 1, and obtaining the initial value of the congestion threshold as 8.
Upon adjusting the bandwidth 1 st time, increasing the bandwidth is needed in response to determining; and determining that the optical transmission network is unobstructed according to the fact that the current value of the bandwidth is smaller than the initial value of the congestion threshold.
And responding to the smooth optical transmission network, sending an adjustment request in an exponential growth mode to a plurality of network devices on the optical transmission network, and continuing to send the adjustment request when receiving an adjustment success signal returned by the devices.
In the first case, in round 2, although the congestion threshold is greater than the bandwidth requirement, after receiving a signal returned by the device that the adjustment failed, the device adjusts the request to an adjustment request in the linear growth mode. And then when the bandwidth value of the 4 th round is increased to 5, receiving an adjustment failure signal returned by the equipment, stopping the adjustment work and modifying the congestion threshold value to be 5.
In the second case, in round 3, when the bandwidth value has reached the congestion threshold value, but the adjustment failure signal returned by the device has not yet been received, the request is adjusted to the adjustment request in the linearly increasing mode. And in the 6 th round, receiving an adjustment failure signal returned by the equipment, stopping the adjustment work and modifying the congestion threshold value to be 9.
In both cases, after the 9 th round, the bandwidth requirement is reduced, and at this time, it is not necessary to determine whether the optical transport network is unobstructed, and the adjustment request in the linear reduction mode is directly sent, so that the equipment resource is released.
It should be noted that, the method of the embodiment of the present application may be performed by a single device, for example, a computer or a server. The method of the embodiment can also be applied to a distributed scene, and is completed by mutually matching a plurality of devices. In the case of such a distributed scenario, one of the devices may perform only one or more steps of the method of an embodiment of the present application, the devices interacting with each other to accomplish the method.
It should be noted that the foregoing describes some embodiments of the present application. Other embodiments are within the scope of the following claims. In some cases, the actions or steps recited in the claims may be performed in a different order than in the embodiments described above and still achieve desirable results. In addition, the processes depicted in the accompanying figures do not necessarily require the particular order shown, or sequential order, to achieve desirable results. In some embodiments, multitasking and parallel processing are also possible or may be advantageous.
Based on the same inventive concept, the application also provides a device for adjusting the bandwidth of the optical service unit connection, which corresponds to the method of any embodiment.
Referring to fig. 4, the device for adjusting the bandwidth of the optical service unit connection in the optical transport network includes:
a determining module 11 configured to: determining whether the optical transport network is unobstructed in response to determining that an increase in bandwidth of the optical service unit connection is required according to traffic information observed in the optical transport network;
a decision module 12 configured to: responsive to the determination module determining that the optical transport network is clear, sending a first request to a plurality of network devices on the optical transport network indicating to increase the bandwidth in a first mode; in response to the determination module determining that the optical transport network is not clear, a second request is sent to the plurality of network devices indicating to increase the bandwidth in a second mode.
For convenience of description, the above devices are described as being functionally divided into various modules, respectively. Of course, the functions of each module may be implemented in the same piece or pieces of software and/or hardware when implementing the present application.
The device of the foregoing embodiment is configured to implement the method for adjusting the bandwidth of the optical service unit connection in any foregoing embodiment, and has the beneficial effects of the corresponding method embodiment, which is not described herein.
Those of ordinary skill in the art will appreciate that: the discussion of any of the embodiments above is merely exemplary and is not intended to suggest that the scope of the application (including the claims) is limited to these examples; the technical features of the above embodiments or in the different embodiments may also be combined within the idea of the application, the steps may be implemented in any order, and there are many other variations of the different aspects of the embodiments of the application as described above, which are not provided in detail for the sake of brevity.
Additionally, well-known power/ground connections to Integrated Circuit (IC) chips and other components may or may not be shown within the provided figures, in order to simplify the illustration and discussion, and so as not to obscure the embodiments of the present application. Furthermore, the devices may be shown in block diagram form in order to avoid obscuring the embodiments of the present application, and also in view of the fact that specifics with respect to implementation of such block diagram devices are highly dependent upon the platform within which the embodiments of the present application are to be implemented (i.e., such specifics should be well within purview of one skilled in the art). Where specific details (e.g., circuits) are set forth in order to describe example embodiments of the application, it should be apparent to one skilled in the art that embodiments of the application can be practiced without, or with variation of, these specific details. Accordingly, the description is to be regarded as illustrative in nature and not as restrictive.
While the application has been described in conjunction with specific embodiments thereof, many alternatives, modifications, and variations of those embodiments will be apparent to those skilled in the art in light of the foregoing description. For example, other memory architectures (e.g., dynamic RAM (DRAM)) may use the embodiments discussed.
The present embodiments are intended to embrace all such alternatives, modifications and variances which fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalent substitutions, improvements, and the like, which are within the spirit and principles of the embodiments of the application, are intended to be included within the scope of the application.
Claims (9)
1. A method for adjusting bandwidth of an optical service unit connection, applied to an optical transport network based on the optical service unit, the method comprising:
determining whether the optical transport network is unobstructed in response to determining that the bandwidth needs to be increased according to traffic information observed in the optical transport network;
in response to determining that the optical transport network is clear, sending a first request to a plurality of network devices on the optical transport network indicating to increase the bandwidth in a first mode; the first mode comprises an exponential growth mode;
in response to determining that the optical transport network is not clear, sending a second request to the plurality of network devices indicating to increase the bandwidth in a second mode; the second mode includes a linear growth mode.
2. The method of claim 1, wherein determining whether the optical transport network is clear comprises:
determining that the optical transport network is clear in response to determining that the current value of the bandwidth is less than a congestion threshold;
and determining that the optical transport network is not unobstructed in response to determining that the current value of the bandwidth is not less than the congestion threshold.
3. The method as recited in claim 2, further comprising:
after receiving first response signals which are returned by the plurality of network devices and respectively respond to the first requests and indicate that the bandwidth adjustment is successful, determining that the bandwidth adjustment is completed;
and after receiving a second response signal which is returned by at least one network device in the plurality of network devices and is used for indicating that bandwidth adjustment fails in response to the first request, retransmitting the second request to the plurality of network devices.
4. A method according to claim 2 or 3, further comprising:
after receiving a third response signal which is returned by the plurality of network devices and indicates that the bandwidth adjustment is successful and is respectively responded to the second request, determining that the bandwidth adjustment is completed;
after receiving a fourth response signal indicating that bandwidth adjustment fails, which is returned by at least one network device in the plurality of network devices in response to the second request, updating the congestion threshold to the current value of the bandwidth, and ending the bandwidth adjustment.
5. The method as recited in claim 1, further comprising:
in response to determining that the bandwidth needs to be reduced according to the traffic information, a third request is sent to the plurality of network devices indicating that the bandwidth is reduced in a third mode.
6. The method of claim 5, wherein the third mode comprises a linear reduction mode.
7. A method according to any one of claims 1 to 3, wherein determining from the traffic information that the bandwidth needs to be increased comprises:
predicting bandwidth requirements in the next time period according to the flow information;
and determining that the bandwidth needs to be increased according to the bandwidth requirement and the current value of the bandwidth.
8. An apparatus for adjusting bandwidth of an optical service unit connection, applied to an optical transport network based on the optical service unit, comprising:
a determination module configured to: determining whether the optical transport network is unobstructed in response to determining that an increase in bandwidth of the optical service unit connection is required according to traffic information observed in the optical transport network;
a decision module configured to: responsive to the determination module determining that the optical transport network is clear, sending a first request to a plurality of network devices on the optical transport network indicating to increase the bandwidth in a first mode; the first mode comprises an exponential growth mode; responsive to the determining module determining that the optical transport network is not clear, sending a second request to the plurality of network devices indicating to increase the bandwidth in a second mode; the second mode includes a linear growth mode.
9. The apparatus of claim 8, wherein the first mode comprises an exponential growth mode and the second mode comprises a linear growth mode.
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