CN113382320A - PON-based adjustment method and system and OLT - Google Patents
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Abstract
The utility model discloses a PON-based adjusting method, system and OLT, relating to the technical field of communication, comprising: distributing the same multicast key for a plurality of ONUs accessing the same slice network element in a multicast mode; judging whether the ONU is adjusted to a target slicing network element from a source slicing network element or not; and if so, informing the ONU to release the multicast key corresponding to the source slicing network element, and reconfiguring the key for the ONU again so as to establish an encryption channel between the ONU and the target slicing network element. The method allocates the corresponding key to each slicing network element, correspondingly adjusts the key of the ONU when the ONU carries out the adjustment of the slicing network element, and does not change the key of the ONU which is not changed to access the slicing network element, thereby not only ensuring the safety of data transmission, but also safely isolating each slicing service.
Description
Technical Field
The present disclosure relates to the field of communications technologies, and in particular, to an adjusting method and system based on a PON (Passive Optical Network) and an OLT (Optical Line Terminal).
Background
PON is a new type of optical access network technology. The system realizes the integrated service access of data, voice and video through a single optical fiber access system, and has good economy. In an Optical access Network, one physical OLT is virtualized into a plurality of slices, so that key resources such as an access machine room, the OLT, an ODN (Optical Distribution Network) and the like are shared. Therefore, when the ONU switches from one slice to another slice, the data transmission security needs to be ensured, and the traffic of each slice needs to be safely isolated.
Disclosure of Invention
The technical problem to be solved by the present disclosure is to provide a PON-based adjustment method, a PON-based adjustment system, and an OLT, which can ensure the security of data transmission and also can safely isolate each slice service.
According to an aspect of the present disclosure, an adjusting method based on a passive optical network PON is provided, where an optical line terminal OLT includes a plurality of slicing network elements, and the method includes: distributing the same multicast key for a plurality of optical network units ONU accessing the same slice network element in a multicast mode; judging whether the ONU is adjusted to a target slicing network element from a source slicing network element or not; and if so, informing the ONU to release the multicast key corresponding to the source slicing network element, and reconfiguring the key for the ONU again so as to establish an encryption channel between the ONU and the target slicing network element.
In some embodiments, reconfiguring the key for the ONU comprises: distributing a random key to the ONU in a unicast mode; and sending the multicast key corresponding to the target slicing network element to the ONU in a multicast mode, so that the ONU updates the random key into the multicast key corresponding to the target slicing network element.
In some embodiments, the sliced network elements accessed by the ONUs are adjusted according to one or more of traffic type, customer differentiated service requirements, and regional requirements.
In some embodiments, a corresponding number of multicast keys is generated based on the number of slicing network elements.
In some embodiments, ONUs accessing different sliced network elements are assigned different downstream traffic channels.
According to another aspect of the present disclosure, an OLT is further provided, where the OLT includes a plurality of slice network elements, and the OLT further includes: the system comprises an initial setting unit, a multicast switching unit and a multicast switching unit, wherein the initial setting unit is configured to distribute the same multicast key to a plurality of optical network units ONU which access the same slice network element in a multicast mode; the slicing monitoring unit is configured to judge whether the ONU is adjusted from a source slicing network element to a target slicing network element; and the key adjusting unit is configured to inform the ONU to release the multicast key corresponding to the source slicing network element and re-configure the key for the ONU to establish an encryption channel between the ONU and the target slicing network element if the ONU is adjusted from the source slicing network element to the target slicing network element.
In some embodiments, the key adjustment unit is configured to assign the random key to the ONU by unicast; and sending the multicast key corresponding to the target slicing network element to the ONU in a multicast mode, so that the ONU updates the random key into the multicast key corresponding to the target slicing network element. .
According to another aspect of the present disclosure, there is also provided an OLT, including: a memory; and a processor coupled to the memory, the processor configured to perform the PON based adjustment method of any one of claims 1 to 5 based on the instructions stored in the memory.
According to another aspect of the present disclosure, there is also provided a PON-based adjustment system, including: the OLT described above; and a plurality of ONUs, wherein each ONU accesses a slice network element of a corresponding OLT.
According to another aspect of the present disclosure, a computer-readable storage medium is also proposed, on which computer program instructions are stored, which instructions, when executed by a processor, implement the PON-based adjustment method described above.
In the embodiment of the disclosure, each slicing network element is assigned with a corresponding key, when the ONU adjusts the slicing network element, the key of the ONU is correspondingly adjusted, and the key of the ONU which does not change the ONU accessing the slicing network element is not changed, which not only can ensure the security of data transmission, but also can ensure the security isolation of each slicing service.
Other features of the present disclosure and advantages thereof will become apparent from the following detailed description of exemplary embodiments thereof, which proceeds with reference to the accompanying drawings.
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The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the disclosure and together with the description, serve to explain the principles of the disclosure.
The present disclosure may be more clearly understood from the following detailed description, taken with reference to the accompanying drawings, in which:
fig. 1 is a schematic structural diagram of some embodiments of a PON-based adjustment method according to the present disclosure.
Fig. 2 is a schematic structural diagram of another embodiment of a PON-based adjustment method according to the present disclosure.
Fig. 3 is a schematic diagram of some embodiments of an ONU access slicing network element of the present disclosure.
Fig. 4 is a schematic diagram of some embodiments of an ONU switching access slice network element according to the present disclosure.
Fig. 5 is a key exchange diagram of some embodiments of the present disclosure.
Fig. 6 is a schematic structural diagram of some embodiments of an OLT of the present disclosure.
Fig. 7 is a schematic structural diagram of another embodiment of an OLT according to the present disclosure.
Detailed Description
Various exemplary embodiments of the present disclosure will now be described in detail with reference to the accompanying drawings. It should be noted that: the relative arrangement of the components and steps, the numerical expressions, and numerical values set forth in these embodiments do not limit the scope of the present disclosure unless specifically stated otherwise.
Meanwhile, it should be understood that the sizes of the respective portions shown in the drawings are not drawn in an actual proportional relationship for the convenience of description.
The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the disclosure, its application, or uses.
Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate.
In all examples shown and discussed herein, any particular value should be construed as merely illustrative, and not limiting. Thus, other examples of the exemplary embodiments may have different values.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.
For the purpose of promoting a better understanding of the objects, aspects and advantages of the present disclosure, reference is made to the following detailed description taken in conjunction with the accompanying drawings.
Fig. 1 is a schematic structural diagram of some embodiments of a PON-based adjustment method according to the present disclosure. The steps in this embodiment are performed by an OLT, where the OLT includes a plurality of sliced network elements, and each sliced network element accesses a plurality of ONUs.
In step 110, the same multicast key is allocated to a plurality of ONUs accessing the same slice network element in a multicast manner. The multicast key is a key transmitted in a multicast manner.
In some embodiments, different slicing network elements correspond to different multicast keys. For example, if the OLT is divided into three slice network elements, three multicast keys are generated, and the three multicast keys are respectively configured to ONUs accessing different slice network elements.
In some embodiments, different downstream traffic channels are allocated to ONUs accessing different slice network elements, and each downstream traffic channel corresponds to a multicast key.
In step 120, it is determined whether the ONU is adjusted from the source slicing network element to the destination slicing network element.
In some embodiments, the slice network elements accessed by the ONUs are adjusted according to the service types, the customer differentiated service requirements or the regional requirements. The source slicing network element refers to a slicing network element accessed before the ONU is accessed to a new slicing network element again, and the target slicing network element refers to a slicing network element accessed to the ONU again.
In step 130, if the ONU is adjusted from the source slicing network element to the destination slicing network element, the ONU is notified to release the key corresponding to the source slicing network element, and the key is reconfigured for the ONU to establish an encryption channel between the ONU and the destination slicing network element. And after the ONU and the target slicing network element establish an encryption channel, the ONU and the target slicing network element transmit data through the encryption channel.
In some embodiments, the slicing network element of the OLT authenticates the newly accessed ONU first, and if the authentication passes, the key is configured for the ONU again.
In some embodiments, a random key is first allocated to the ONU, and then the multicast key corresponding to the destination sliced network element is sent to the ONU, so that the ONU updates the random key to the multicast key corresponding to the destination sliced network element.
In the above embodiment, each slicing network element is assigned with a corresponding key, when an ONU adjusts the slicing network element, the key of the ONU is correspondingly adjusted, and no key change is performed for the ONU that does not change the access slicing network element, which can ensure the security of data transmission and can safely isolate each slicing service.
Fig. 2 is a schematic structural diagram of another embodiment of a PON-based adjustment method according to the present disclosure.
At step 210, the physical OLT is divided into a plurality of sliced network elements.
In some embodiments, a plurality of slice network elements can be created for the OLT according to different service types, different customer differentiated service requirements and different regional requirements, so as to maximize the investment value. The OLT allocates different downlink service channels for different cut-in network elements.
In step 220, the OLT generates a plurality of multicast keys according to the number of sliced network elements.
In step 230, the OLT allocates the same multicast key to ONUs accessing the same slice network element in a multicast manner. The ONU has multicast reception authority.
In step 240, it is determined whether the ONU is adjusted from the source slicing network element to the destination slicing network element, if so, step 250 is executed, otherwise, the step is executed to continue waiting for the next adjustment.
In some embodiments, for example, the OLT divides the sliced network elements according to regional requirements, and when an ONU is migrated from one office building to another, an adjustment from the ONU to the source sliced network element to the destination sliced network element may occur. Or, the OLT divides the sliced network elements according to the service requirements, and if a certain ONU changes from a high bandwidth requirement to a low delay requirement, the ONU is adjusted from the source sliced network element to the destination sliced network element.
In step 250, the ONU that switches to the access slice network element is notified to release the multicast key corresponding to the source slice network element.
In step 260, a random key is assigned to the ONU switching the access slice network element in a unicast manner. In this step, a random key is assigned to each ONU.
After the ONU releases the key corresponding to the source slicing network element, there is no key between the ONU and the newly accessed destination slicing network element, and the security of data transmission cannot be guaranteed.
In step 270, the multicast key corresponding to the target slice network element is sent to the ONU in a multicast manner, so that the ONU updates the random key to the multicast key corresponding to the target slice network element.
And if a plurality of ONUs change the accessed slicing network elements simultaneously, changing the keys one by one according to a single ONU switching flow.
The embodiment may further include step 280, determining whether there are any ONUs to be adjusted from the source slicing network element to the destination slicing network element, if yes, executing step 250, otherwise, ending the process.
In the above embodiment, when the ONU switches the accessed slice network element according to the requirement, the corresponding key is updated synchronously, and the key is not changed for the ONU which does not change the accessed slice network element, that is, the security isolation of each slice service is ensured, the continuity of other services is ensured, and the ONU is not interfered by slice adjustment.
The present disclosure will now be described by way of example of one specific embodiment.
First, the ONU registers the upper limit, and the OLT divides the ONU into different sliced network elements 1, 2, and 3 according to the service requirements, and generates multicast keys key1, key2, and key 3.
As shown in fig. 3, ONU1 and ONU2 access sliced network element 1, ONU3 and ONU4 access sliced network element 2, and ONU5 … ONUn access sliced network element 3. The OLT transmits the multicast key1 to ONU1 and ONU2 by multicast, transmits the multicast key2 to ONU3 and ONU4 by multicast, and transmits the multicast key3 to ONU5 to ONUn by multicast.
According to the service requirement, as shown in fig. 4, the ONU2 needs to switch from the slicing network element 1 to the slicing network element 2, and the OLT and ONU protocol interaction process is as shown in fig. 5.
At step 510, the OLT notifies the ONU2 to change the slicing network element.
At step 520, ONU2 returns a response.
At step 530, the OLT notifies ONU2 to release the original key 1.
After the ONU2 releases the original key, the response is returned again at step 540.
The switch from slicing network element 1 to slicing network element 2 is made by the above-mentioned step ONU 2.
At step 550, the OLT sends the random key to ONU2 in a unicast manner.
In step 560, ONU2 returns a response after receiving the random key.
In step 570, the OLT transmits the key2 to the ONU2 by multicast.
In step 580, ONU2 returns a response after receiving key 2.
At step 590, ONU2 updates key2, thereby establishing an encrypted channel.
Since ONU1, ONU3, ONU4, and ONU5 … ONUn do not change the sliced network elements, it is not necessary to update ONU1, ONU3, ONU4, and ONU5 … ONUn. ONU1, ONU3, ONU4, and ONU5 … ONUn can continue to execute services without being interfered by the adjustment of the slicing network element.
Fig. 6 is a schematic structural diagram of some embodiments of an OLT of the present disclosure. The OLT includes an initial setting unit 610, a slice monitoring unit 620, and a key adjustment unit 630.
The initial setting unit 610 is configured to assign the same multicast key to a plurality of optical network units ONUs accessing the same slice network element in a multicast manner.
In some embodiments, a corresponding number of multicast keys is generated according to the number of slicing network elements, and different slicing network elements correspond to different multicast keys. And the OLT allocates different downlink service channels to the ONUs accessed to the different slicing network elements.
The slicing monitoring unit 620 is configured to determine whether an ONU is tuned from a source slicing network element to a destination slicing network element.
In some embodiments, the slice network elements accessed by the ONUs are adjusted according to the service types, the customer differentiated service requirements or the regional requirements.
The key adjusting unit 630 is configured to notify the ONU to release the multicast key corresponding to the source slicing network element and reconfigure the key for the ONU to establish an encrypted channel between the ONU and the destination slicing network element if the ONU is adjusted from the source slicing network element to the destination slicing network element.
In some embodiments, a random key is first allocated to an ONU that switches to access a slice network element in a unicast manner, and then a multicast key corresponding to a target slice network element is sent to the ONU in a multicast manner, so that the ONU updates the random key to the multicast key corresponding to the target slice network element.
In the above embodiment, when the ONU switches the accessed slice network element according to the requirement, the corresponding key is updated synchronously, and the key is not changed for the ONU which does not change the accessed slice network element, that is, the security isolation of each slice service is ensured, the continuity of other services is ensured, and the ONU is not interfered by slice adjustment.
Fig. 7 is a schematic structural diagram of another embodiment of an OLT according to the present disclosure. The OLT comprises, in addition to a plurality of slicing network elements, a memory 710 and a processor 720. Wherein: the memory 710 may be a magnetic disk, flash memory, or any other non-volatile storage medium. The memory is used for storing the instructions in the embodiments corresponding to fig. 1, 2 and 5. Processor 720, coupled to memory 710, may be implemented as one or more integrated circuits, such as a microprocessor or microcontroller. The processor 720 is configured to execute instructions stored in the memory.
In some embodiments, processor 720 is coupled to memory 710 through a BUS BUS 730. The OLT 700 may also be coupled to an external storage system 750 via a storage interface 740 for invoking external data and may also be coupled to a network or another computer system (not shown) via a network interface 760. And will not be described in detail herein.
In this embodiment, the data instruction is stored in the memory, and the processor processes the instruction, so that the security of data transmission can be ensured, and the security of each slice service can be isolated.
In other embodiments of the present disclosure, a PON-based adjustment system is also protected, as shown in fig. 3 and 4, where the adjustment system includes an OLT and a plurality of ONUs, where the OLT creates a plurality of sliced network elements, and each ONU accesses the sliced network element of the corresponding OLT.
In other embodiments, a computer-readable storage medium has stored thereon computer program instructions which, when executed by a processor, implement the steps of the method in the embodiments corresponding to fig. 1-2. As will be appreciated by one skilled in the art, embodiments of the present disclosure may be provided as a method, apparatus, or computer program product. Accordingly, the present disclosure may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present disclosure may take the form of a computer program product embodied on one or more computer-usable non-transitory 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 disclosure is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems) and computer program products according to embodiments of the disclosure. 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.
Thus far, the present disclosure has been described in detail. Some details that are well known in the art have not been described in order to avoid obscuring the concepts of the present disclosure. It will be fully apparent to those skilled in the art from the foregoing description how to practice the presently disclosed embodiments.
Although some specific embodiments of the present disclosure have been described in detail by way of example, it should be understood by those skilled in the art that the foregoing examples are for purposes of illustration only and are not intended to limit the scope of the present disclosure. It will be appreciated by those skilled in the art that modifications may be made to the above embodiments without departing from the scope and spirit of the present disclosure. The scope of the present disclosure is defined by the appended claims.
Claims (10)
1. An adjusting method based on a Passive Optical Network (PON), wherein an Optical Line Terminal (OLT) comprises a plurality of slicing network elements, the method comprises the following steps:
distributing the same multicast key for a plurality of optical network units ONU accessing the same slice network element in a multicast mode;
judging whether the ONU is adjusted from a source slicing network element to a target slicing network element; and
and if so, informing the ONU to release a multicast key corresponding to the source slicing network element, and reconfiguring the key for the ONU again to establish an encryption channel between the ONU and the target slicing network element.
2. The PON based adjustment method according to claim 1, wherein re-configuring the key for the ONU comprises:
distributing a random key to the ONU in a unicast mode; and
and sending the multicast key corresponding to the target slicing network element to the ONU in a multicast mode, so that the ONU updates the random key into the multicast key corresponding to the target slicing network element.
3. The PON-based adjustment method of claim 1,
and adjusting the slicing network element accessed by the ONU according to one or more of the service type, the customer differentiated service requirement and the regional requirement.
4. The PON-based adjustment method of any one of claims 1 to 3,
and generating a multicast key with a corresponding number according to the number of the slicing network elements.
5. The PON-based adjustment method of any one of claims 1 to 3,
and allocating different downlink service channels to the ONUs accessed to the different slicing network elements.
6. An optical line terminal, OLT, wherein the OLT comprises a plurality of sliced network elements, the OLT further comprising:
the system comprises an initial setting unit, a multicast switching unit and a multicast switching unit, wherein the initial setting unit is configured to distribute the same multicast key to a plurality of optical network units ONU which access the same slice network element in a multicast mode;
the slicing monitoring unit is configured to judge whether the ONU is adjusted from a source slicing network element to a target slicing network element; and
and the key adjusting unit is configured to notify the ONU to release a multicast key corresponding to the source slicing network element and re-configure the key for the ONU to establish an encryption channel between the ONU and the destination slicing network element if the ONU is adjusted from the source slicing network element to the destination slicing network element.
7. The OLT of claim 6, wherein,
the key adjustment unit is configured to assign a random key to the ONU in a unicast manner; and sending the multicast key corresponding to the target slice network element to the ONU in a multicast mode, so that the ONU updates the random key into the multicast key corresponding to the target slice network element.
8. An optical line termination, OLT, comprising:
a memory; and
a processor coupled to the memory, the processor configured to execute the passive optical network PON-based adjustment method according to any one of claims 1 to 5 based on instructions stored in the memory.
9. A passive optical network, PON, based adjustment system, comprising:
the optical line termination OLT of any of claims 6 to 8; and
and each ONU is accessed to the slice network element of the corresponding OLT.
10. A computer readable storage medium having stored thereon computer program instructions which, when executed by a processor, implement the passive optical network PON based adjustment method of any one of claims 1 to 5.
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