CN106572401A - Optical access network system based on software definition and realization method thereof - Google Patents
Optical access network system based on software definition and realization method thereof Download PDFInfo
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- CN106572401A CN106572401A CN201610887228.6A CN201610887228A CN106572401A CN 106572401 A CN106572401 A CN 106572401A CN 201610887228 A CN201610887228 A CN 201610887228A CN 106572401 A CN106572401 A CN 106572401A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04Q—SELECTING
- H04Q11/00—Selecting arrangements for multiplex systems
- H04Q11/0001—Selecting arrangements for multiplex systems using optical switching
- H04Q11/0062—Network aspects
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04Q—SELECTING
- H04Q11/00—Selecting arrangements for multiplex systems
- H04Q11/0001—Selecting arrangements for multiplex systems using optical switching
- H04Q11/0062—Network aspects
- H04Q11/0067—Provisions for optical access or distribution networks, e.g. Gigabit Ethernet Passive Optical Network (GE-PON), ATM-based Passive Optical Network (A-PON), PON-Ring
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04Q—SELECTING
- H04Q11/00—Selecting arrangements for multiplex systems
- H04Q11/0001—Selecting arrangements for multiplex systems using optical switching
- H04Q11/0062—Network aspects
- H04Q2011/0079—Operation or maintenance aspects
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04Q—SELECTING
- H04Q11/00—Selecting arrangements for multiplex systems
- H04Q11/0001—Selecting arrangements for multiplex systems using optical switching
- H04Q11/0062—Network aspects
- H04Q2011/0086—Network resource allocation, dimensioning or optimisation
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- Data Exchanges In Wide-Area Networks (AREA)
Abstract
The invention discloses an optical access network system based on software definition and a realization method thereof. The method includes that an SDN controller is additionally arranged in the uplink direction of the optical line terminal of a GPON to monitor and adjust the bandwidth distribution and ONU access registration in real time, the control of the GPON transmission convergence layer is moved up to the SDN controller, so that the flexible control of the bandwidth allocation of the GPON network and the ONU access registration can be realized, a southbound protocol agent is added to the optical line terminal, so that the communication of the SDN controller and the optical line terminal is realized via the southbound protocol. The bandwidth allocated by different ONUs is adjusted according to the flow condition in the GPON in real time, and an appropriate scheme of automatically finding windows is determined according to the actual online number of the ONUs, so that the system delay is effectively reduced, and the utilization rate of network bandwidth is improved.
Description
Technical field
The present invention relates to technical field of photo communication, and in particular to a kind of optical access network system based on software definition and in fact
Existing method.
Background technology
With the fast development of quickening and the emerging service in the Internet of integration of three networks process, the business in access network is presented
Variation and complication.On the one hand increasing family and commercial user wish to obtain bigger access bandwidth, on the other hand
Want to flexibly subtly be controlled own service bandwidth, therefore, people put forward higher requirement to optical access network,
Except further traditional 1G PON (passive optical network, EPON) are upgraded to beyond 10G PON,
Being more desirable to it can possess the features such as intelligence, open and flexible management and control, and conventional access network system is using the management mould being pre-configured with
The bandwidth and the grade of service of formula, user and business has just been fixed in network opening, be difficult change, cause bandwidth allocation and
The automatic discovery procedure underaction of business, it is difficult to meet the demand.
Software defined network (SDN) controls on network to be separated with forwarding as a kind of new network architecture, and the bottom of to
Layer physical equipment carries out programmable control, realizes the opening and flexible management and control of network.At present, SDN is obtained in multiple fields
To utilization, such as data center, optical transfer network, and SDN thoughts are applied to into optical access network to realize opening for access net system
Put and flexible management and control, also by the concern and research of more and more people.
SDN mainly applies in mesh network, by control of the controller to global information, reasonably to different business stream
It is route, the utilization rate for making Internet resources is maximized.And for access network, its topology belongs to point-to-multipoint tree structure,
All Business Streams are all in optical line terminal (OLT, optical line terminal) and optical network unit (ONU, optical
Network unit) between be transmitted, there is no routing issue, the application scenarios initial with SDN are not inconsistent, therefore, how to fill
Divide and be considered as on the basis of the functions such as the bandwidth allocation of the Medium Access Layer of PON cores, user's access registration, for existing
The defect of PON system bandwidth allocation and automatic discovery procedure underaction, carries out SDNization, it has also become need badly to optical access network
Solve problem.
The content of the invention
The technical problem to be solved is in the bandwidth for taking into full account the Medium Access Layer as PON cores point
On the basis of with functions such as, user's access registrations, for existing PON system bandwidth allocation and automatic discovery procedure underaction
Defect, the problem of SDNization is carried out to optical access network.
In order to solve above-mentioned technical problem, the technical solution adopted in the present invention is to provide a kind of light based on software definition
Access net system, including SDN controllers and optical line terminal, wherein, the SDN controllers include that bandwidth allocation module, ONU are noted
Data base and the south orientation protocol interface of volume management module, storage network state information and ONU online information；The optical link end
End includes a south orientation agency by agreement；
Network state information of the bandwidth allocation module in the data base calculates the bandwidth allocation ginseng of each ONU
Number, and the south orientation agency by agreement is sent to by the south orientation protocol interface；The south orientation agency by agreement parses bandwidth allocation
Parameter, and send the Dynamic Bandwidth Allocation module of transmission convergence layer to；The Dynamic Bandwidth Allocation module updates bandwidth allocation and calculates
Corresponding bandwidth allocation parameters in method, re-start the bandwidth allocation of each ONU, and periodically pass through bandwidth allocation statistics
The south orientation agency by agreement reports the SDN controllers, updates the data bank network status information, the bandwidth allocation module
Re-start bandwidth allocation parameters calculating；
The ONU registration managements module initiates an automatic discovery procedure, and informs institute by the south orientation protocol interface
State south orientation agency by agreement；Automatic discovery procedure is initiated signaled transmission convergence layer by the south orientation agency by agreement；The transmission
Convergence-level carries out ONU registration activation according to the automatic discovery flow process defined in ITU-TG984.3, and after ONU succeeds in registration, will
The statistical information of ONU is sent to SDN controllers, updates the data ONU online information in storehouse 13；The ONU registration managements module root
The unlatching parameter of automatic discovery procedure is initiated next time according to the adjustment of ONU online information.
The present invention also provides a kind of implementation method of the optical access network system based on software definition, comprises the following steps：
Reality is carried out to bandwidth allocation and ONU access registrations in the optical line terminal up direction addition SDN controllers of GPON
When monitoring, adjustment, and add south orientation agency by agreement in optical line terminal, realize SDN controllers and optical line terminal by south
Communicated to agreement；
For bandwidth allocation：
Bandwidth allocation module calculates the bandwidth allocation parameters of each ONU according to network state information in SDN controllers, and leads to
Cross south orientation agreement and be sent to transmission convergence layer；
South orientation agency by agreement parses bandwidth allocation parameters, issues the Dynamic Bandwidth Allocation module of transmission convergence layer, updates it
Corresponding bandwidth allocation parameters in own bandwidth allocation algorithm, and according to the new bandwidth allocation parameters for updating and ITU-T G984.3
Signalling exchange agreement defined in standard carries out bandwidth allocation to each ONU；
Bandwidth allocation statistical information is periodically reported SDN controls by Dynamic Bandwidth Allocation module by south orientation agency by agreement
Device processed, updates the data network state information in storehouse；
According to the network state information after renewal, the parameter of different ONU bandwidth allocations is recalculated, and start next round band
Wide allocation flow；
For ONU access registrations：
ONU registration managements module initiates an automatic discovery procedure in SDN controllers, and informs south orientation agency by agreement；
Automatic discovery procedure is initiated signaled transmission convergence layer by south orientation agency by agreement；
Transmission convergence layer carries out ONU registration activation according to the automatic discovery flow process defined in ITU-T G984.3, and in ONU
After succeeding in registration, the statistical information of ONU is reported into SDN controllers, updates the data the ONU online information in storehouse,
The unlatching parameter of automatic discovery procedure next time is calculated according to the ONU online information for updating.
In the above-mentioned methods, the south orientation agreement be Openflow agreements, Simple Network Management Protocol, TR-069 agreements or
Person PON network management system south orientation standard agreements itself.
In the above-mentioned methods,
When GPON entirety flows are less, SDN controllers increase the bandwidth allocation parameters of each ONU；
When GPON entirety flows are larger, SDN controllers reduce the bandwidth allocation parameters of each ONU.
In the above-mentioned methods, the bandwidth allocation Signalling exchange agreement defined in ITU-T G984.3 standards is only entered in GPON
OK, the bandwidth allocation parameters during SDN controllers are periodically to being stored in transmission convergence layer Dynamic Bandwidth Allocation module are carried out
Control, directly with ONU does not have Signalling exchange.
In the above-mentioned methods, bandwidth allocation statistical information report cycle is the arbitrary integer time in DBA cycles.
In the above-mentioned methods,
When the online quantity of ONU is larger in GPON, SDN controllers reduce the initiation frequency of automatic discovery procedure and automatically
It was found that quiet window size；
When the online quantity of ONU is less in GPON, SDN controllers increase the initiation frequency of automatic discovery procedure and automatically
It was found that quiet window size.
The present invention adds SDN controllers and bandwidth allocation and ONU is connect by the optical line terminal up direction in GPON
Entering registration carries out monitor in real time, adjustment, and adds south orientation agency by agreement in optical line terminal, solves SDN controllers and light
Intercommunication problem between the terminal of road, so that moving on in the control of GPON transmission convergence layers on SDN controllers, it is right to realize
The bandwidth allocation of GPON networks and flexible control, the adjustment of ONU access registrations, are effectively reduced system delay, improve net
The utilization rate of network bandwidth.
Description of the drawings
Fig. 1 provides a kind of structural representation of the optical access network system based on software definition for the present invention；
Fig. 2 is the flow chart of bandwidth allocation in the present invention；
Fig. 3 is the flow chart of ONU access registrations in the present invention.
Specific embodiment
The present invention is directed to the defect of existing PON system bandwidth allocation and automatic discovery procedure underaction, to soft exchange
Net carries out SDNization, there is provided a kind of both again might be used in real time according to the bandwidth of traffic conditions adjustment difference ONU distribution in GPON
To determine the suitable scheme for finding window automatically in line number according to ONU reality, the utilization rate for making Internet resources is maximized.
The present invention is described in detail with reference to Figure of description and specific embodiment.
As shown in figure 1, a kind of optical access network system based on software definition that the present invention is provided, including SDN controllers 10
And optical line terminal OLT.Wherein, SDN controllers 10 include bandwidth allocation module 11, ONU registration managements module 12, storage network
The data base 13 of status information and ONU online information and the south orientation protocol interface 14 communicated with optical line terminal OLT；Optical link
Terminal OLT includes a south orientation agency by agreement 21, for the south orientation protocol interface communication with SDN controllers 10, remainder with
GPON OLT are identical, and as included the PLOAM (physical layer operations are managed and safeguarded) of transmission convergence layer, (ONU is managed and control OMCI
Interface), Embedded OAM (embedded operation manage and safeguard) and DBA modules (Dynamic Bandwidth Allocation module) etc., here
Repeat no more.It should be noted that in GPON systems, PLOAM, OMCI and Embedded OAM modules are responsible for GPON systems
In bandwidth allocation and ONU registration managements, corresponding hardware interface is mainly to provide in the present invention, enter with SDN controllers 10
Row communication.
Network state information of the bandwidth allocation module 11 of SDN controllers 10 in data base 13 calculates each ONU's
Bandwidth allocation parameters, and south orientation agency by agreement 21 is sent to by south orientation protocol interface 14, for instructing bandwidth of the OLT to ONU
Request carries out rational bandwidth allocation；South orientation agency by agreement 21 is parsed to bandwidth allocation parameters, and sends optical link end to
DBA (Dynamic Bandwidth Allocation) module of end OLT transmission convergence layers, DBA modules update corresponding bandwidth in its bandwidth allocation algorithm
Allocation of parameters, re-starts the bandwidth allocation of each ONU, and periodically bandwidth allocation statistics is passed through into south orientation agency by agreement 21
SDN controllers 10 are reported, the network state information in storehouse 13 is updated the data, bandwidth allocation module 11 is according to the network state for updating
Information re-starts bandwidth allocation parameters calculating, starts next round bandwidth allocation.
The ONU registration managements module 12 of SDN controllers 10 initiates an automatic discovery procedure, and by south orientation protocol interface
14 inform south orientation agency by agreement 21；South orientation agency by agreement 21 initiates the automatic discovery procedure for receiving to inform that transmission converges after signaling
Poly layer, transmission convergence layer carries out ONU registration activation according to the automatic discovery flow process defined in ITU-TG984.3, and in ONU registrations
After success, the statistical information of ONU is sent to into SDN controllers 10, at the ONU statistical information that SDN controllers 10 pairs are reported
Reason, and be stored in data base 13, ONU online information is updated, ONU registration managements module 12 is according to the ONU online information for updating
The unlatching parameter (initiating frequency with quiet window size) of automatic discovery procedure is initiated in adjustment next time.
The present invention is the 1G GPON systems or the 10G under ITU-T standard under ITU-T standard suitable for GPON systems
GPON systems.SDN controllers 10 are communicated with optical line terminal OLT by corresponding south orientation agreement；South orientation agency by agreement 21
Communicated by the hardware interface of OLT itself with the transmission convergence layer of GPON.
A kind of implementation method of optical access network system based on software definition that the present invention is provided, comprises the following steps：
Optical line terminal up direction addition SDN controllers are carried out to bandwidth allocation and ONU access registrations in GPON
Monitor in real time, adjustment, so that moving on in the control of GPON transmission convergence layers on SDN controllers, realize the band to GPON networks
Width distribution and the flexible control of ONU access registrations, and add south orientation agency by agreement in optical line terminal, realize SDN controls
Device is communicated with optical line terminal by south orientation agreement；
As shown in Fig. 2 for bandwidth allocation, comprising the steps：
Bandwidth allocation module calculates the bandwidth allocation of each ONU according to network state information in step S11, SDN controller
Parameter (specially transmits the parameter of container T-CONT, the implication involved by parameters is advised by ITU-T G984.3 standards
It is fixed), and by south orientation agreement (south orientation agreement be Openflow agreements, Simple Network Management Protocol (SNMP), TR-069 agreements or
Person PON network management system itself south orientation standard agreements etc.) transmission convergence layer of OLT is sent to, for instructing bandwidth of the OLT to ONU
Request carries out rational bandwidth allocation.
In step s 11, when GPON entirety flows are less, SDN controllers can increase the bandwidth allocation ginseng of each ONU
Number so that each ONU can as much as possible pass all of data in the distribution time slot of oneself, reduces ONU data delays；And work as
When GPON entirety flows are larger, SDN controllers can reduce the bandwidth allocation parameters of an ONU, and the ONU for preventing load larger was seized
Many bandwidth, affect fairness and the time delay of ONU data transfers.
Step S12, south orientation agency by agreement parsing bandwidth allocation parameters, issue the DBA modules of transmission convergence layer, DBA modules
Corresponding bandwidth allocation parameters in own bandwidth allocation algorithm are updated according to the bandwidth allocation parameters for receiving, OLT is according to new renewal
Bandwidth allocation parameters and ITU-T G984.3 standards defined in Signalling exchange agreement bandwidth allocation is carried out to each ONU.
In step s 12, the bandwidth allocation Signalling exchange agreement defined in ITU-T G984.3 standards is only entered in GPON
OK, the bandwidth allocation parameters during SDN controllers are periodically to being stored in OLT transmission convergence layer DBA modules are controlled, and
Directly with ONU there is not Signalling exchange.
Bandwidth allocation statistical information is periodically reported SDN controls by step S13, DBA module by south orientation agency by agreement
Device processed, on the basis of the DBA cycles, user can be with for the bandwidth allocation statistical information report cycle interaction cycle of OLT (controller with)
The bandwidth allocation statistical report cycle is set as M DBA cycle, M can be arbitrary integer, so, after M DBA cycle,
The bandwidth allocation statistical information in M DBA cycle can be reported SDN controllers by DBA modules.
Step S14, statistics in the bandwidth allocation statistical information that reports of periodicity, the bandwidth request and reality of different ONU
The amount of bandwidth of border distribution, and be stored in data base, update network state information.
Step S15, according to the network state information after renewal, recalculate the bandwidth allocation parameters of different ONU, and start
Next round bandwidth allocation flow process.
As shown in figure 3, for ONU access registrations, comprising the steps：
ONU registration managements module initiates an automatic discovery procedure in step S21, SDN controller, and informs south orientation agreement
Agency.
Step S22, south orientation agency by agreement receive automatic discovery procedure and initiate after signaling, to be ordered the biography for informing OLT
Defeated convergence-level.
The transmission convergence layer of step S23, OLT receives automatic discovery procedure and initiates after order, according to ITU-T G984.3
Defined in automatic discovery flow process carry out ONU registration activation.
After step S24, ONU succeeds in registration, the statistical information of ONU is reported SDN controllers by OLT.
Step S25, SDN controller is processed the ONU statistical information for reporting, and is stored in data base, updates ONU
Online information, in the unlatching parameter that automatic discovery procedure next time is calculated according to the ONU online information for updating.
In the present invention, when the online quantity of online ONU is larger in GPON, SDN controllers will reduce automatic discovery procedure
Initiation frequency and the quiet window size that finds automatically, improve the utilization rate of GPON bandwidth；When online ONU is online in GPON
When quantity is less, SDN controllers increase the initiation frequency of automatic discovery procedure and the quiet window size for finding automatically, it is ensured that
The registration efficiency of ONU.
Obviously, those skilled in the art can carry out the essence of various changes and modification without deviating from the present invention to the present invention
God and scope.So, if these modifications of the present invention and modification belong to the scope of the claims in the present invention and its equivalent technologies
Within, then the present invention is also intended to comprising these changes and modification.
Claims (7)
1. a kind of optical access network system based on software definition, including optical line terminal, it is characterised in that also including SDN controls
Device, the SDN controllers include that bandwidth allocation module, ONU registration management modules, storage network state information and ONU believe online
The data base of breath and south orientation protocol interface；The optical line terminal includes a south orientation agency by agreement；
Network state information of the bandwidth allocation module in the data base calculates the bandwidth allocation parameters of each ONU,
And the south orientation agency by agreement is sent to by the south orientation protocol interface；The south orientation agency by agreement parsing bandwidth allocation ginseng
Number, and send the Dynamic Bandwidth Allocation module of transmission convergence layer to；The Dynamic Bandwidth Allocation module updates bandwidth allocation algorithm
In corresponding bandwidth allocation parameters, re-start the bandwidth allocation of each ONU, and periodically bandwidth allocation statistics is passed through into institute
State south orientation agency by agreement and report the SDN controllers, update the network state information of the data base, the bandwidth allocation module
Re-start bandwidth allocation parameters calculating；
The ONU registration managements module initiates an automatic discovery procedure, and informs the south by the south orientation protocol interface
To agency by agreement；Automatic discovery procedure is initiated signaled transmission convergence layer by the south orientation agency by agreement；The Transmission Convergence
Layer carries out ONU registration activation according to the automatic discovery flow process defined in ITU-TG984.3, and after ONU succeeds in registration, by ONU
Statistical information be sent to SDN controllers, update ONU online information in the data base；The ONU registration managements module according to
The unlatching parameter of automatic discovery procedure is initiated in the adjustment of ONU online information next time.
2. a kind of implementation method of the optical access network system based on software definition, it is characterised in that comprise the following steps：
Bandwidth allocation and ONU access registrations are supervised in real time in the optical line terminal up direction addition SDN controllers of GPON
Control, adjustment, and add south orientation agency by agreement in optical line terminal, realize that SDN controllers are assisted with optical line terminal by south orientation
View is communicated；
For bandwidth allocation：
Bandwidth allocation module calculates the bandwidth allocation parameters of each ONU according to network state information in SDN controllers, and by south
Transmission convergence layer is sent to agreement；
South orientation agency by agreement parses bandwidth allocation parameters, issues the Dynamic Bandwidth Allocation module of transmission convergence layer, updates its bandwidth
Corresponding bandwidth allocation parameters in allocation algorithm, and according to fixed in the new bandwidth allocation parameters for updating and ITU-T G984.3 standards
The Signalling exchange agreement of justice carries out bandwidth allocation to each ONU；
Bandwidth allocation statistical information is periodically reported SDN controls by Dynamic Bandwidth Allocation module by south orientation agency by agreement
Device, updates the data network state information in storehouse；
According to the network state information for updating, the bandwidth allocation parameters of different ONU are recalculated, start next round bandwidth allocation；
For ONU access registrations：
ONU registration managements module initiates an automatic discovery procedure in SDN controllers, and informs south orientation agency by agreement；
Automatic discovery procedure is initiated signaled transmission convergence layer by south orientation agency by agreement；
Transmission convergence layer carries out ONU registration activation according to the automatic discovery flow process defined in ITU-T G984.3, and in ONU registrations
After success, the statistical information of ONU is reported into SDN controllers, updates the data the ONU online information in storehouse,
The unlatching parameter of automatic discovery procedure next time is calculated according to the ONU online information for updating.
3. method as claimed in claim 2, it is characterised in that the south orientation agreement is Openflow agreements, simple network pipe
Reason agreement, TR-069 agreements or PON network management systems south orientation standard agreement itself.
4. method as claimed in claim 2, it is characterised in that
When GPON entirety flows are less, SDN controllers increase the bandwidth allocation parameters of each ONU；
When GPON entirety flows are larger, SDN controllers reduce the bandwidth allocation parameters of each ONU.
5. method as claimed in claim 2, it is characterised in that the bandwidth allocation signaling defined in ITU-T G984.3 standards is handed over
Mutually agreement is only carried out in GPON, SDN controllers be periodically to being stored in transmission convergence layer Dynamic Bandwidth Allocation module in
Bandwidth allocation parameters be controlled, directly with ONU do not have Signalling exchange.
6. method as claimed in claim 2, it is characterised in that bandwidth allocation statistical information report cycle is appointed for the DBA cycles
Meaning integral multiple.
7. method as claimed in claim 2, it is characterised in that
When the online quantity of ONU is larger in GPON, SDN controllers reduce the initiation frequency of automatic discovery procedure and find automatically
Quiet window size；
When the online quantity of ONU is less in GPON, SDN controllers increase the initiation frequency of automatic discovery procedure and find automatically
Quiet window size.
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| CN110267130A (en) * | 2019-07-01 | 2019-09-20 | 博为科技有限公司 | A kind of remote configuring method and device of the optical network unit based on SDN |
| CN114465903A (en) * | 2021-12-29 | 2022-05-10 | 湖南红鑫通信技术有限责任公司 | Management system and method for improving maximum normalized throughput of wireless optical communication network |
| CN114465903B (en) * | 2021-12-29 | 2024-05-28 | 湖南红鑫通信技术有限责任公司 | Management system and method for improving maximum normalized throughput of wireless optical communication network |
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