CN115996336B - Dynamic bandwidth allocation method and system for 50G NG-EPON - Google Patents

Dynamic bandwidth allocation method and system for 50G NG-EPON Download PDF

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CN115996336B
CN115996336B CN202310288405.9A CN202310288405A CN115996336B CN 115996336 B CN115996336 B CN 115996336B CN 202310288405 A CN202310288405 A CN 202310288405A CN 115996336 B CN115996336 B CN 115996336B
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optical network
network unit
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CN115996336A (en
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许鸥
梁嘉琪
陈哲
肖文才
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Guangdong University of Technology
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Abstract

The invention discloses a dynamic bandwidth allocation method and a system for 50G NG-EPON, which relate to the technical field of optical access network communication, wherein an optical line terminal calculates a first maximum bandwidth limit and a second maximum bandwidth limit according to uplink bandwidth requests of all optical network units; a first working wavelength is allocated for the 25G optical network unit, and an authorized bandwidth is allocated according to the relation between the uplink request bandwidth and the first maximum bandwidth limit; for a 50G optical network unit, determining to allocate a second working wave or allocate a first working wavelength and a second working wavelength according to the relation between the uplink request bandwidth size and the second maximum bandwidth limit, and further allocating the authorized bandwidths on the two working wavelengths. And the optical network unit uploads service data according to the allocated working wavelength and the size of the authorized bandwidth. The invention can dynamically and reasonably allocate different working wavelengths and authorized bandwidths for two optical network units with different rates, and improves network performance and service quality.

Description

Dynamic bandwidth allocation method and system for 50G NG-EPON
Technical Field
The present invention relates to the technical field of optical access network communications, and more particularly, to a dynamic bandwidth allocation method and system for a 50G NG-EPON.
Background
With the rapid development of communication technology in recent years, various network services with high bandwidth requirements and low delay requirements are continuously emerging, which puts higher demands on an access network directly responsible for service access of an end user. Passive Optical Networks (PON) are widely used in various access network scenarios as the most mainstream access technology at present due to their advantages of low networking cost, high transmission quality, strong interference resistance, capability of carrying out multi-service comprehensive load bearing, etc. Because the capacity and bandwidth of the PON can directly affect the internet surfing experience of the general public, on the premise of not changing the total bandwidth and keeping the network uninterrupted, the optimal configuration of network resources is achieved by dynamically changing the uplink bandwidth allocation in each channel, thereby improving the service quality of the optical access network.
The PON comprises an optical line terminal (OLT, opticalLineTerminator) at the local side, an optical network unit (ONU, opticalNetworkUnit) at the user side and an optical distribution network (ODN, opticalDistributionNetwork) for connecting the OLT and the ONU. To access the internet, the ONU must continuously receive service data from the user, upload the service data to the OLT through the ODN, and upload the service data to the central core network through the OLT, so that the user can access the internet and experience various network applications. During operation of the PON, each ONU must upload a specified amount of data in a period of time authorized by the OLT to ensure proper operation of the entire PON network. The problems of the uploading sequence of the data, the uploading data size and the selection of which wavelength to transmit for all ONUs under one PON are all attributed to Dynamic Wavelength Bandwidth Allocation (DWBA) in the passive optical network. The DWBA mechanism is implemented to improve upstream bandwidth utilization of the access network and to guarantee PON performance in terms of packet loss and throughput.
According to the IEEE 802.3ca standard, 50G NG-EPONs are classified into three classes according to different downstream/upstream rates: 50G/10G,50G/25G and 50G/50G. The 50G/50G NG-EPON system is used as an upgrading and evolution system of the existing optical access network, and two working wavelengths with the speed of 25G are respectively arranged on the uplink and the downlink and used for data transmission, and the maximum supported beam splitting ratio is 1:64; the system comprises 32 50G ONU, and the transmission distance can reach 20 km. As shown in fig. 1, the 50G NG-PON system must be compatible with 25G ONUs in addition to the 50G ONUs. The 25G ONU can upload data only through one of the working wavelengths, and the 50G ONU can upload service data using one working wavelength or using two working wavelengths simultaneously through a channel bonding technology. Whereas previous dynamic bandwidth allocation methods were developed for old standard studies, a new DWBA algorithm is needed to meet the network requirements.
Many DWBA algorithms have been proposed for multi-wavelength NG-EPON systems. But scheduling is only performed for ONUs under 100G NG-EPON with four working wavelengths, and two ONUs with different transmission rates and different working wavelengths, namely a 25G ONU and a 50G ONU, exist at the same time under one PON system are not considered.
The prior art discloses a method and a device for realizing load balancing in a time-division multiplexing passive optical network system, which relate to the TWDM-PON field, do not reserve any bandwidth resource for DBA modules of all wavelength channels, and only calculate the residual bandwidth of all wavelength channels when an ONU starts up; and selecting the wavelength channel with the most residual bandwidth resources conforming to the ONU business service agreement, configuring bandwidth for the ONU on the wavelength channel and authorizing the use. When complex allocation is carried out, the influence of ONU with different rates is not considered, any bandwidth resource is not reserved, the bandwidth utilization rate is improved to a certain extent, but the bandwidth allocation is unreasonable, the factors of different services on different bandwidth demands are not considered, and reasonable dynamic bandwidth allocation can not be carried out for ONU with two different transmission rates and different working wavelengths.
Disclosure of Invention
The invention provides a dynamic bandwidth allocation method and a system for 50G NG-EPON, which can dynamically and reasonably allocate different working wavelengths and authorized bandwidths for optical network units with two different transmission rates and improve the network performance and service quality of the 50G NG-EPON, in order to overcome the defect that the prior art cannot reasonably allocate dynamic bandwidths when two ONUs with different transmission rates and different working wavelengths are simultaneously used in the same PON system.
In order to solve the technical problems, the technical scheme of the invention is as follows:
the invention provides a dynamic bandwidth allocation method for 50G NG-EPON, which comprises the following steps:
s1: the optical line terminal receives uplink bandwidth request report messages of all optical network units, wherein the uplink bandwidth request report messages comprise IDs of the optical network units and uplink request bandwidth sizes;
s2: the optical line terminal calculates a first maximum bandwidth limit and a second maximum bandwidth limit according to the uplink bandwidth request report messages of all the optical network units;
s3: the optical line terminal judges the type of each optical network unit according to the ID of the optical network unit; if the type of the optical network unit is 25G, executing step S4; if the type of the optical network unit is a 50G optical network unit, executing step S5;
s4: the optical line terminal distributes a first working wavelength to the 25G optical network unit, determines the authorized bandwidth size of the 25G optical network unit according to the relation between the uplink request bandwidth size of the 25G optical network unit and the first maximum bandwidth limit, and executes step S8;
s5: judging whether the uplink request bandwidth of the 50G optical network unit is smaller than a second maximum bandwidth limit; if the number is smaller than the preset number, executing a step S6; otherwise, step S7 is performed:
S6: the optical line terminal allocates a second working wavelength to the 50G optical network unit, takes the uplink request bandwidth size of the 50G optical network unit as the authorized bandwidth size of the 50G optical network unit, and executes step S8;
s7: the optical line terminal limits the second maximum bandwidth as the authorized bandwidth size of the 50G optical network unit, and distributes the first working wavelength and the second working wavelength to the 50G optical network unit; determining the authorized bandwidth size of the 50G optical network unit on the first working wavelength and the authorized bandwidth size of the 50G optical network unit on the second working wavelength according to the relation between the first maximum bandwidth limit and the second maximum bandwidth limit, and executing step S8;
s8: and each optical network unit calculates the authorized bandwidth size of each type of service on the optical network unit according to the allocated authorized bandwidth size, and uploads the data of each type of service to the optical line terminal according to the allocated working wavelength and in a preset sequence.
50G NG-EPON contains ONU's of two rates: in the same polling period, the 25G ONU and the 50G ONU under the 50G NG-EPON architecture can only use a first working wavelength to carry out uplink transmission of data, and the 50G ONU can use a single first working wavelength or a second working wavelength and can also use two working wavelengths to carry out uplink transmission of data; obtaining a first maximum bandwidth limit by classifying all ONU into 25G ONU and 50G ONU and averaging the uplink request bandwidth of all 25G ONU; averaging the uplink request bandwidth sizes of all 50G ONUs to obtain a second maximum bandwidth limit; when the authorized bandwidth of the 25G ONU is allocated, comparing the uplink request bandwidth of the 25G ONU with the first maximum bandwidth limit, and determining the authorized bandwidth of the 25G ONU; when the 50G ONU line authorized bandwidth is allocated, comparing the size of the 50G ONU uplink request bandwidth with the second maximum bandwidth limit, and determining the authorized bandwidth size of the 50G ONU; because the 50G ONU can use a single first working wavelength or a second working wavelength, and can also use two working wavelengths for data transmission, the first maximum bandwidth limit and the second maximum bandwidth limit are further compared, and the authorized bandwidth size of each 50G ONU on the first working wavelength and the authorized bandwidth size on the second working wavelength are determined. And finally, each optical network unit calculates the authorized bandwidth size of each type of service on the optical network unit according to the allocated authorized bandwidth size, and uploads the data of each type of service to the optical line terminal according to the allocated working wavelength in a preset sequence. The invention considers the characteristics of different rates of ONU under the same 50G NG-EPON and different service requirements on bandwidth and delay, reasonably and dynamically distributes the uplink bandwidth and working wavelength of each ONU, and improves the network performance and service quality of the 50G NG-EPON.
Preferably, the specific method of step S2 is as follows:
the optical line terminal divides all optical network units into two types according to the transmission rate information recorded in the ID of the optical network unit, including a 25G optical network unit and a 50G optical network unit;
averaging the uplink request bandwidth sizes of all the 25G optical network units to obtain a first maximum bandwidth limit:
Figure SMS_1
in the method, in the process of the invention,
Figure SMS_2
representing a first maximum bandwidth limit, +.>
Figure SMS_3
Representing the first in a 25G optical network unitiUplink request bandwidth size of the optical network units;Nrepresenting the number of 25G optical network units, +.>
Figure SMS_4
；
Averaging the uplink request bandwidth sizes of all the 50G optical network units to obtain a second maximum bandwidth limit:
Figure SMS_5
in the method, in the process of the invention,
Figure SMS_6
representing a second maximum bandwidth limit, +.>
Figure SMS_7
Representing the first in a 50G optical network unitjUplink request bandwidth size of the optical network units;Mrepresenting the number of 25G optical network units; />
Figure SMS_8
；
And, in addition, the processing unit,M+N=K，Krepresenting the total number of optical network units in the 50G NG-EPON.
Preferably, in step S4, according to the relation between the uplink request bandwidth size and the first maximum bandwidth limit of the 25G optical network unit, the specific method for determining the authorized bandwidth size of the 25G optical network unit is as follows:
s41: judging whether the uplink request bandwidth of the 25G optical network unit is smaller than a first maximum bandwidth limit; if yes, go to step S42; otherwise, step S43 is performed;
S42: taking the uplink request bandwidth size of the 25G optical network unit as the authorized bandwidth size of the 25G optical network unit on the first working wavelength;
s43: the first maximum bandwidth limit is used as an authorized bandwidth size of the 25G optical network unit on a first operating wavelength.
Preferably, in step S7, the specific method for determining the authorized bandwidth size of the 50G optical network unit on the first operating wavelength and the authorized bandwidth size on the second operating wavelength according to the relationship between the first maximum bandwidth limit and the second maximum bandwidth limit is as follows:
s71: judging whether the second maximum bandwidth limit is smaller than 2 times of the first maximum bandwidth limit; if not, executing step S72; otherwise, step S73 is performed;
s72: step S76 is executed by subtracting the first maximum bandwidth limitation by 2 times from the second maximum bandwidth limitation as the authorized bandwidth size of the 50G optical network unit at the first working wavelength;
s73: judging whether the second maximum bandwidth limit is larger than the first maximum bandwidth limit; if yes, go to step S74; otherwise, step S75 is performed;
s74: subtracting the first maximum bandwidth limit from the second maximum bandwidth limit to obtain an authorized bandwidth size of the 50G optical network unit at the first operating wavelength, and executing step S76;
S75: setting the authorized bandwidth of the 50G optical network unit at the first operating wavelength to 0, and executing step S76;
s76: and subtracting the authorized bandwidth size of the 50G optical network unit at the first working wavelength from the total authorized bandwidth size of the 50G optical network unit to serve as the authorized bandwidth size of the 50G optical network unit at the second working wavelength.
Preferably, the various types of services include an acceleration forwarding service, a guaranteed forwarding service and a best effort service;
the uplink request bandwidth size of each optical network unit is composed of the uplink request bandwidth size of the accelerated forwarding service, the uplink request bandwidth size of the guaranteed forwarding service and the uplink request bandwidth size of the best effort service, namely:
Figure SMS_9
in the method, in the process of the invention,
Figure SMS_10
represent the firstkUplink request bandwidth size of an optical network unit,/-for each optical network unit>
Figure SMS_11
Represent the firstkPersonal optical networkUpstream request bandwidth size of acceleration forwarding service of network element, < >>
Figure SMS_12
Represent the firstkThe uplink request bandwidth size of the personal optical network unit for ensuring forwarding service is +.>
Figure SMS_13
Represent the firstkThe uplink request bandwidth size of best effort traffic of the optical network units.
Preferably, in step S8, the specific method for calculating the authorization bandwidth size of each type of service on the optical network unit according to the allocated authorization bandwidth size by each optical network unit is as follows:
S81: will be the firstkThe size of the authorized bandwidth allocated by the optical network unit is recorded as
Figure SMS_14
Judging->
Figure SMS_15
Whether or not is greater than->
Figure SMS_16
The method comprises the steps of carrying out a first treatment on the surface of the If yes, go to step S83; otherwise, step S82 is performed;
s82: assigned to the firstkAuthorized bandwidth size for best effort traffic of an optical network unit
Figure SMS_17
Assigned to the firstkThe authorization bandwidth size of the personal optical network unit for ensuring forwarding traffic is +.>
Figure SMS_18
The method comprises the steps of carrying out a first treatment on the surface of the The remaining licensed bandwidth sizes are all allocated to the expedited forwarding traffic, i.e. the firstkAuthorization bandwidth size for accelerated forwarding traffic for an optical network unit
Figure SMS_19
；
S83: assigned to the firstkAuthorization bandwidth size for accelerated forwarding traffic for an optical network unit
Figure SMS_20
Assigned to the firstkThe authorization bandwidth size of the personal optical network unit for ensuring forwarding traffic is +.>
Figure SMS_21
The method comprises the steps of carrying out a first treatment on the surface of the The remaining licensed bandwidth sizes are all allocated to best effort traffic, i.e. the firstkAuthorized bandwidth size for best effort traffic of an optical network unit>
Figure SMS_22
。
The invention also provides a dynamic bandwidth allocation system for 50G NG-EPON, comprising:
the request receiving module is used for receiving uplink bandwidth request report messages of all optical network units by the optical line terminal, wherein the uplink bandwidth request report messages comprise the IDs of the optical network units and the uplink request bandwidth sizes;
the bandwidth limit calculation module is used for calculating a first maximum bandwidth limit and a second maximum bandwidth limit according to the uplink bandwidth request report messages of all the optical network units by the optical line terminal;
The first judging module is used for judging the type of each optical network unit according to the ID of the optical network unit by the optical line terminal; if the type of the optical network unit is 25G optical network unit, turning to a first distribution module; if the type of the optical network unit is a 50G optical network unit, the method goes to a second judging module;
the first allocation module is used for allocating a first working wavelength to the 25G optical network unit by the optical line terminal, determining the authorized bandwidth size of the 25G optical network unit according to the uplink request bandwidth size of the 25G optical network unit and a first maximum bandwidth limiting relation, and transferring to the service uploading module;
a second judging module, configured to judge whether the uplink request bandwidth size of the 50G optical network unit is smaller than a second maximum bandwidth limit; if the number is smaller than the first distribution module, the second distribution module is switched to; otherwise, go to the third allocation module:
the second allocation module is configured to allocate a second working wavelength to the 50G optical network unit by using the optical line terminal, and transfer the uplink request bandwidth size of the 50G optical network unit to the service upload module as the authorized bandwidth size of the 50G optical network unit;
a third allocation module, configured to allocate a first operating wavelength and a second operating wavelength to the 50G optical network unit by using the second maximum bandwidth limitation as an authorized bandwidth size of the 50G optical network unit by using the optical line terminal; determining the authorized bandwidth size of the 50G optical network unit on the first working wavelength and the authorized bandwidth size of the 50G optical network unit on the second working wavelength according to the relation between the first maximum bandwidth limit and the second maximum bandwidth limit, and transferring to a service uploading module;
And the service uploading module is used for calculating the authorized bandwidth sizes of various types of services on the optical network unit according to the allocated authorized bandwidth sizes by each optical network unit, and uploading the data of the various types of services to the optical line terminal according to the allocated working wavelength in a preset sequence.
Preferably, in the first allocation module, determining the authorized bandwidth size of the 25G optical network unit according to the relation between the uplink request bandwidth size of the 25G optical network unit and the first maximum bandwidth limit specifically includes:
a first sub-judging unit, configured to judge whether the uplink request bandwidth size of the 25G optical network unit is smaller than a first maximum bandwidth limit; if the bandwidth is smaller than the first bandwidth, turning to a first sub-bandwidth authorization unit; otherwise, turning to a first sub-bandwidth authorization unit;
the first sub-bandwidth authorization unit is used for taking the uplink request bandwidth size of the 25G optical network unit as the authorization bandwidth size of the 25G optical network unit on a first working wavelength;
and the second sub-bandwidth authorization unit is used for limiting the first maximum bandwidth as the authorized bandwidth size of the 25G optical network unit on the first working wavelength.
Preferably, in the third allocation module, determining the authorized bandwidth size of the 50G optical network unit on the first operating wavelength and the authorized bandwidth size on the second operating wavelength according to the relationship between the first maximum bandwidth limit and the second maximum bandwidth limit specifically includes:
A second sub-judgment unit configured to judge whether the second maximum bandwidth limit is less than 2 times the first maximum bandwidth limit; if not, turning to a third sub-bandwidth authorization unit; otherwise, turning to a third sub-judging unit;
a third sub-bandwidth authorization unit, which uses the second maximum bandwidth limit minus 2 times of the first maximum bandwidth limit as the authorized bandwidth of the 50G optical network unit at the first working wavelength, and transfers to a sixth sub-bandwidth authorization unit;
a third sub-judging unit for judging whether the second maximum bandwidth limit is greater than the first maximum bandwidth limit; if the bandwidth is larger than the first bandwidth, the fourth bandwidth is transferred to a fourth sub-bandwidth authorization unit; otherwise, turning to a fifth sub-bandwidth authorizing unit;
a fourth sub-bandwidth grant unit, which uses the second maximum bandwidth limit minus the first maximum bandwidth limit as the grant bandwidth of the 50G optical network unit at the first working wavelength, and transfers to a sixth sub-bandwidth grant unit;
a fifth sub-bandwidth authorization unit, configured to set the authorization bandwidth of the 50G optical network unit at the first operating wavelength to 0, and switch to a sixth sub-bandwidth authorization unit;
and a sixth sub-bandwidth authorization unit, which uses the total authorization bandwidth size of the 50G optical network unit minus the authorization bandwidth size of the 50G optical network unit at the first working wavelength as the authorization bandwidth size of the 50G optical network unit at the second working wavelength.
Preferably, in the service uploading module, each type of service includes an acceleration forwarding service, a guaranteed forwarding service and a best effort service;
the uplink request bandwidth size of each optical network unit is composed of the uplink request bandwidth size of the accelerated forwarding service, the uplink request bandwidth size of the guaranteed forwarding service and the uplink request bandwidth size of the best effort service, namely:
Figure SMS_23
in the method, in the process of the invention,
Figure SMS_24
represent the firstkUplink request bandwidth size of an optical network unit,/-for each optical network unit>
Figure SMS_25
Represent the firstkUplink request bandwidth size of accelerated forwarding service of an Optical Network Unit (ONU)>
Figure SMS_26
Represent the firstkThe uplink request bandwidth size of the personal optical network unit for ensuring forwarding service is +.>
Figure SMS_27
Represent the firstkThe uplink request bandwidth size of best effort service of the optical network unit;
each optical network unit calculates the authorized bandwidth size of each type of service on the optical network unit according to the allocated authorized bandwidth size, and specifically includes:
a fourth sub-judgment unit for judging the fourth sub-unitkThe size of the authorized bandwidth allocated by the optical network unit is recorded as
Figure SMS_28
Judging->
Figure SMS_29
Whether or not is greater than->
Figure SMS_30
The method comprises the steps of carrying out a first treatment on the surface of the If the service bandwidth is larger than the first service bandwidth, turning to a first service bandwidth authorization unit; otherwise, turning to a second service bandwidth authorization unit;
a first service bandwidth authorizing unit allocated to the first service bandwidth kAuthorized bandwidth size for best effort traffic of an optical network unit
Figure SMS_31
Assigned to the firstkAuthorization bandwidth size for ensuring forwarding traffic for an optical network unit
Figure SMS_32
The method comprises the steps of carrying out a first treatment on the surface of the Remaining grant bandwidth size full allocationFor accelerated forwarding traffic, i.e. the firstkThe authorization bandwidth size of the accelerated forwarding traffic of an optical network unit>
Figure SMS_33
；
A second service bandwidth authorizing unit allocated to the first service bandwidthkAuthorization bandwidth size for accelerated forwarding traffic for an optical network unit
Figure SMS_34
Assigned to the firstkAuthorization bandwidth size for ensuring forwarding traffic for an optical network unit
Figure SMS_35
The method comprises the steps of carrying out a first treatment on the surface of the The remaining licensed bandwidth sizes are all allocated to best effort traffic, i.e. the firstkAuthorized bandwidth size for best effort traffic of an optical network unit>
Figure SMS_36
。
Compared with the prior art, the technical scheme of the invention has the beneficial effects that:
the invention considers the characteristics of the optical network units with different rates on the bandwidth size requirement under the same 50G NG-EPON, calculates the first maximum bandwidth limit and the second maximum bandwidth limit through the uplink bandwidth request report information of all the optical network units, classifies the optical network units according to the rates, compares the relation between the uplink request bandwidth sizes of the optical network units with different rates and the first maximum bandwidth limit or the second maximum bandwidth limit, dynamically distributes reasonable authorized bandwidth and working wavelength for each optical network unit, and improves the network performance of the 50G NG-EPON; and finally, each optical network unit calculates the authorized bandwidth size of each type of service on the optical network unit according to the allocated authorized bandwidth size, and uploads the data of each type of service to the optical line terminal according to the allocated working wavelength in a preset sequence, so that the delay requirements of different types of service on bandwidth are considered, and the network service quality of the 50G NG-EPON is improved.
Drawings
Fig. 1 is a schematic diagram of a conventional 50G NG-PON system according to the background art.
Fig. 2 is a schematic diagram of uplink bandwidth allocation of the 50G NG-PON system according to embodiment 1.
Fig. 3 is a flow chart of a dynamic bandwidth allocation method for a 50G NG-EPON according to embodiment 1.
Fig. 4 is a flowchart illustrating a method for determining an authorized bandwidth size of a 25G optical network unit at a first operating wavelength according to embodiment 2.
Fig. 5 is a flowchart illustrating a method for determining an authorized bandwidth size of the 50G optical network unit at a first operating wavelength and an authorized bandwidth size at a second operating wavelength according to embodiment 2.
Fig. 6 is a flowchart of a method for calculating the authorization bandwidth size of each type of service on an optical network unit according to embodiment 2.
Fig. 7 is a schematic diagram of a dynamic bandwidth allocation system for a 50G NG-EPON according to embodiment 3.
Fig. 8 is a schematic structural diagram of the first distribution module in embodiment 3.
Fig. 9 is a schematic structural view of a third distribution module according to embodiment 3.
Fig. 10 is a schematic structural diagram of a service upload module in embodiment 3.
Detailed Description
The drawings are for illustrative purposes only and are not to be construed as limiting the present patent;
For the purpose of better illustrating the embodiments, certain elements of the drawings may be omitted, enlarged or reduced and do not represent the actual product dimensions;
it will be appreciated by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted.
The technical scheme of the invention is further described below with reference to the accompanying drawings and examples.
Embodiment 1, as shown in fig. 2, a 50G NG-EPON contains ONUs of two rates: in the same polling period, the 25G ONU and the 50G ONU under the 50G NG-EPON architecture can only use a first working wavelength to carry out uplink transmission of data, while the 50G ONU can use a single first working wavelength or a second working wavelength or can simultaneously use two working wavelengths to carry out uplink transmission of data, so that the bandwidth and the working wavelengths are allocated dynamically more reasonably:
the embodiment provides a dynamic bandwidth allocation method for a 50G NG-EPON, as shown in FIG. 3, comprising:
s1: the optical line terminal receives uplink bandwidth request report messages of all optical network units, wherein the uplink bandwidth request report messages comprise IDs of the optical network units and uplink request bandwidth sizes;
s2: the optical line terminal calculates a first maximum bandwidth limit and a second maximum bandwidth limit according to the uplink bandwidth request report messages of all the optical network units;
S3: the optical line terminal judges the type of each optical network unit according to the ID of the optical network unit; if the type of the optical network unit is 25G, executing step S4; if the type of the optical network unit is a 50G optical network unit, executing step S5;
s4: the optical line terminal distributes a first working wavelength to the 25G optical network unit, determines the authorized bandwidth size of the 25G optical network unit according to the relation between the uplink request bandwidth size of the 25G optical network unit and the first maximum bandwidth limit, and executes step S8;
s5: judging whether the uplink request bandwidth of the 50G optical network unit is smaller than a second maximum bandwidth limit; if the number is smaller than the preset number, executing a step S6; otherwise, step S7 is performed:
s6: the optical line terminal allocates a second working wavelength to the 50G optical network unit, takes the uplink request bandwidth size of the 50G optical network unit as the authorized bandwidth size of the 50G optical network unit, and executes step S8;
s7: the optical line terminal limits the second maximum bandwidth as the authorized bandwidth size of the 50G optical network unit, and distributes the first working wavelength and the second working wavelength to the 50G optical network unit; determining the authorized bandwidth size of the 50G optical network unit on the first working wavelength and the authorized bandwidth size of the 50G optical network unit on the second working wavelength according to the relation between the first maximum bandwidth limit and the second maximum bandwidth limit, and executing step S8;
S8: and each optical network unit calculates the authorized bandwidth size of each type of service on the optical network unit according to the allocated authorized bandwidth size, and uploads the data of each type of service to the optical line terminal according to the allocated working wavelength and in a preset sequence.
In a specific implementation process, classifying all ONU into 25G ONU and 50G ONU, and averaging the uplink request bandwidth of all 25G ONU to obtain a first maximum bandwidth limit; averaging the uplink request bandwidth sizes of all 50G ONUs to obtain a second maximum bandwidth limit; when the authorized bandwidth of the 25G ONU is allocated, comparing the uplink request bandwidth of the 25G ONU with the first maximum bandwidth limit, and determining the authorized bandwidth of the 25G ONU; when the 50G ONU line authorized bandwidth is allocated, comparing the size of the 50G ONU uplink request bandwidth with the second maximum bandwidth limit, and determining the authorized bandwidth size of the 50G ONU; because the 50G ONU can use a single first working wavelength or a second working wavelength, and can also use two working wavelengths for data transmission, the first maximum bandwidth limit and the second maximum bandwidth limit are further compared, and the authorized bandwidth size of each 50G ONU on the first working wavelength and the authorized bandwidth size on the second working wavelength are determined. And finally, each optical network unit calculates the authorized bandwidth size of each type of service on the optical network unit according to the allocated authorized bandwidth size, and uploads the data of each type of service to the optical line terminal according to the allocated working wavelength in a preset sequence. The invention considers the characteristics of different rates of ONU under the same 50G NG-EPON and different service requirements on bandwidth and delay, reasonably and dynamically distributes the uplink bandwidth and working wavelength of each ONU, and improves the network performance and service quality of the 50G NG-EPON.
Embodiment 2 provides a dynamic bandwidth allocation method for a 50G NG-EPON, including:
s1: the optical line terminal receives uplink bandwidth request report messages of all optical network units, wherein the uplink bandwidth request report messages comprise IDs of the optical network units and uplink request bandwidth sizes;
the uplink request bandwidth size of each optical network unit is composed of the uplink request bandwidth size of the accelerated forwarding service, the uplink request bandwidth size of the guaranteed forwarding service and the uplink request bandwidth size of the best effort service, namely:
Figure SMS_37
in the method, in the process of the invention,
Figure SMS_38
represent the firstkUplink request bandwidth size of an optical network unit,/-for each optical network unit>
Figure SMS_39
Represent the firstkUplink request bandwidth size of accelerated forwarding service of an Optical Network Unit (ONU)>
Figure SMS_40
Represent the firstkThe uplink request bandwidth size of the personal optical network unit for ensuring forwarding service is +.>
Figure SMS_41
Represent the firstkThe uplink request bandwidth size of best effort traffic of the optical network units.
S2: the optical line terminal calculates a first maximum bandwidth limit and a second maximum bandwidth limit according to the uplink bandwidth request report messages of all the optical network units; the specific method comprises the following steps:
the optical line terminal divides all optical network units into two types according to the transmission rate information recorded in the ID of the optical network unit, including a 25G optical network unit and a 50G optical network unit;
Averaging the uplink request bandwidth sizes of all the 25G optical network units to obtain a first maximum bandwidth limit:
Figure SMS_42
in the method, in the process of the invention,
Figure SMS_43
representing a first maximum bandwidth limit, +.>
Figure SMS_44
Representing the first in a 25G optical network unitiUplink request bandwidth size of the optical network units;Nrepresenting the number of 25G optical network units, +.>
Figure SMS_45
；
Averaging the uplink request bandwidth sizes of all the 50G optical network units to obtain a second maximum bandwidth limit:
Figure SMS_46
in the method, in the process of the invention,
Figure SMS_47
representing a second maximum bandwidth limit, +.>
Figure SMS_48
Representing the first in a 50G optical network unitjUplink request bandwidth size of the optical network units;Mrepresenting the number of 25G optical network units; />
Figure SMS_49
；
And, in addition, the processing unit,M+N=K，Krepresenting the total number of optical network units in the 50G NG-EPON.
S3: the optical line terminal judges the type of each optical network unit according to the ID of the optical network unit; if the type of the optical network unit is 25G, executing step S4; if the type of the optical network unit is a 50G optical network unit, executing step S5;
s4: the optical line terminal distributes a first working wavelength to the 25G optical network unit, determines the authorized bandwidth size of the 25G optical network unit according to the relation between the uplink request bandwidth size of the 25G optical network unit and the first maximum bandwidth limit, and executes step S8;
As shown in fig. 4, a specific method for determining the authorization bandwidth size of the 25G optical network unit is as follows:
s41: judging whether the uplink request bandwidth of the 25G optical network unit is smaller than a first maximum bandwidth limit; if yes, go to step S42; otherwise, step S43 is performed;
s42: taking the uplink request bandwidth size of the 25G optical network unit as the authorized bandwidth size of the 25G optical network unit on the first working wavelength;
s43: the first maximum bandwidth limit is used as an authorized bandwidth size of the 25G optical network unit on a first operating wavelength.
S5: judging whether the uplink request bandwidth of the 50G optical network unit is smaller than a second maximum bandwidth limit; if the number is smaller than the preset number, executing a step S6; otherwise, step S7 is performed:
s6: the optical line terminal allocates a second working wavelength to the 50G optical network unit, takes the uplink request bandwidth size of the 50G optical network unit as the authorized bandwidth size of the 50G optical network unit, and executes step S8;
s7: the optical line terminal limits the second maximum bandwidth as the authorized bandwidth size of the 50G optical network unit, and distributes the first working wavelength and the second working wavelength to the 50G optical network unit; determining the authorized bandwidth size of the 50G optical network unit on the first working wavelength and the authorized bandwidth size of the 50G optical network unit on the second working wavelength according to the relation between the first maximum bandwidth limit and the second maximum bandwidth limit, and executing step S8;
As shown in fig. 5, a specific method for determining the authorized bandwidth size of the 50G optical network unit at the first operating wavelength and the authorized bandwidth size at the second operating wavelength is as follows:
s71: judging whether the second maximum bandwidth limit is smaller than 2 times of the first maximum bandwidth limit; if not, executing step S72; otherwise, step S73 is performed;
s72: step S76 is executed by subtracting the first maximum bandwidth limitation by 2 times from the second maximum bandwidth limitation as the authorized bandwidth size of the 50G optical network unit at the first working wavelength;
s73: judging whether the second maximum bandwidth limit is larger than the first maximum bandwidth limit; if yes, go to step S74; otherwise, step S75 is performed;
s74: subtracting the first maximum bandwidth limit from the second maximum bandwidth limit to obtain an authorized bandwidth size of the 50G optical network unit at the first operating wavelength, and executing step S76;
s75: setting the authorized bandwidth of the 50G optical network unit at the first operating wavelength to 0, and executing step S76;
s76: and subtracting the authorized bandwidth size of the 50G optical network unit at the first working wavelength from the total authorized bandwidth size of the 50G optical network unit to serve as the authorized bandwidth size of the 50G optical network unit at the second working wavelength.
S8: each optical network unit calculates the authorized bandwidth size of each type of service on the optical network unit according to the allocated authorized bandwidth size, and uploads the data of each type of service to the optical line terminal in a preset sequence through the allocated working wavelength;
the various types of services comprise an acceleration forwarding service, a guaranteed forwarding service and a best effort service;
as shown in fig. 6, the specific method for calculating the authorization bandwidth of each type of service on the present optical network unit is as follows:
s81: will be the firstkThe size of the authorized bandwidth allocated by the optical network unit is recorded as
Figure SMS_50
Judging->
Figure SMS_51
Whether or not is greater than->
Figure SMS_52
The method comprises the steps of carrying out a first treatment on the surface of the If yes, go to step S83; otherwise, step S82 is performed;
s82: assigned to the firstkAuthorized bandwidth size for best effort traffic of an optical network unit
Figure SMS_53
Assigned to the firstkAssured forwarding of individual optical network unitsAuthorized bandwidth size of service +.>
Figure SMS_54
The method comprises the steps of carrying out a first treatment on the surface of the The remaining licensed bandwidth sizes are all allocated to the expedited forwarding traffic, i.e. the firstkAuthorization bandwidth size for accelerated forwarding traffic for an optical network unit
Figure SMS_55
；
S83: assigned to the firstkAuthorization bandwidth size for accelerated forwarding traffic for an optical network unit
Figure SMS_56
Assigned to the firstkThe authorization bandwidth size of the personal optical network unit for ensuring forwarding traffic is +. >
Figure SMS_57
The method comprises the steps of carrying out a first treatment on the surface of the The remaining licensed bandwidth sizes are all allocated to best effort traffic, i.e. the firstkAuthorized bandwidth size for best effort traffic of an optical network unit>
Figure SMS_58
。
Embodiment 3, this embodiment provides a dynamic bandwidth allocation system for a 50G NG-EPON, as shown in fig. 7, comprising:
the request receiving module is used for receiving uplink bandwidth request report messages of all optical network units by the optical line terminal, wherein the uplink bandwidth request report messages comprise the IDs of the optical network units and the uplink request bandwidth sizes;
the uplink request bandwidth size of each optical network unit is composed of the uplink request bandwidth size of the accelerated forwarding service, the uplink request bandwidth size of the guaranteed forwarding service and the uplink request bandwidth size of the best effort service, namely:
Figure SMS_59
in the method, in the process of the invention,
Figure SMS_60
represent the firstkUplink request bandwidth size of an optical network unit,/-for each optical network unit>
Figure SMS_61
Represent the firstkUplink request bandwidth size of accelerated forwarding service of an Optical Network Unit (ONU)>
Figure SMS_62
Represent the firstkThe uplink request bandwidth size of the personal optical network unit for ensuring forwarding service is +.>
Figure SMS_63
Represent the firstkThe uplink request bandwidth size of best effort service of the optical network unit;
the bandwidth limit calculation module is used for calculating a first maximum bandwidth limit and a second maximum bandwidth limit according to the uplink bandwidth request report messages of all the optical network units by the optical line terminal;
The first judging module is used for judging the type of each optical network unit according to the ID of the optical network unit by the optical line terminal; if the type of the optical network unit is 25G optical network unit, turning to a first distribution module; if the type of the optical network unit is a 50G optical network unit, the method goes to a second judging module;
the first allocation module is used for allocating a first working wavelength to the 25G optical network unit by the optical line terminal, determining the authorized bandwidth size of the 25G optical network unit according to the uplink request bandwidth size of the 25G optical network unit and a first maximum bandwidth limiting relation, and transferring to the service uploading module;
a second judging module, configured to judge whether the uplink request bandwidth size of the 50G optical network unit is smaller than a second maximum bandwidth limit; if the number is smaller than the first distribution module, the second distribution module is switched to; otherwise, go to the third allocation module:
the second allocation module is configured to allocate a second working wavelength to the 50G optical network unit by using the optical line terminal, and transfer the uplink request bandwidth size of the 50G optical network unit to the service upload module as the authorized bandwidth size of the 50G optical network unit;
a third allocation module, configured to allocate a first operating wavelength and a second operating wavelength to the 50G optical network unit by using the second maximum bandwidth limitation as an authorized bandwidth size of the 50G optical network unit by using the optical line terminal; determining the authorized bandwidth size of the 50G optical network unit on the first working wavelength and the authorized bandwidth size of the 50G optical network unit on the second working wavelength according to the relation between the first maximum bandwidth limit and the second maximum bandwidth limit, and transferring to a service uploading module;
And the service uploading module is used for calculating the authorized bandwidth sizes of various types of services on the optical network unit according to the allocated authorized bandwidth sizes by each optical network unit, and uploading the data of the various types of services to the optical line terminal according to the allocated working wavelength in a preset sequence.
As shown in fig. 8, in the first allocation module, determining, according to the relation between the uplink request bandwidth size of the 25G optical network unit and the first maximum bandwidth limit, the authorized bandwidth size of the 25G optical network unit specifically includes:
a first sub-judging unit, configured to judge whether the uplink request bandwidth size of the 25G optical network unit is smaller than a first maximum bandwidth limit; if the bandwidth is smaller than the first bandwidth, turning to a first sub-bandwidth authorization unit; otherwise, turning to a first sub-bandwidth authorization unit;
the first sub-bandwidth authorization unit is used for taking the uplink request bandwidth size of the 25G optical network unit as the authorization bandwidth size of the 25G optical network unit on a first working wavelength;
and the second sub-bandwidth authorization unit is used for limiting the first maximum bandwidth as the authorized bandwidth size of the 25G optical network unit on the first working wavelength.
As shown in fig. 9, in the third allocation module, determining, according to a relationship between the first maximum bandwidth limit and the second maximum bandwidth limit, an authorized bandwidth size of the 50G optical network unit on the first operating wavelength and an authorized bandwidth size of the 50G optical network unit on the second operating wavelength specifically includes:
A second sub-judgment unit configured to judge whether the second maximum bandwidth limit is less than 2 times the first maximum bandwidth limit; if not, turning to a third sub-bandwidth authorization unit; otherwise, turning to a third sub-judging unit;
a third sub-bandwidth authorization unit, which uses the second maximum bandwidth limit minus 2 times of the first maximum bandwidth limit as the authorized bandwidth of the 50G optical network unit at the first working wavelength, and transfers to a sixth sub-bandwidth authorization unit;
a third sub-judging unit for judging whether the second maximum bandwidth limit is greater than the first maximum bandwidth limit; if the bandwidth is larger than the first bandwidth, the fourth bandwidth is transferred to a fourth sub-bandwidth authorization unit; otherwise, turning to a fifth sub-bandwidth authorizing unit;
a fourth sub-bandwidth grant unit, which uses the second maximum bandwidth limit minus the first maximum bandwidth limit as the grant bandwidth of the 50G optical network unit at the first working wavelength, and transfers to a sixth sub-bandwidth grant unit;
a fifth sub-bandwidth authorization unit, configured to set the authorization bandwidth of the 50G optical network unit at the first operating wavelength to 0, and switch to a sixth sub-bandwidth authorization unit;
and a sixth sub-bandwidth authorization unit, which uses the total authorization bandwidth size of the 25G optical network unit minus the authorization bandwidth size of the 25G optical network unit at the first working wavelength as the authorization bandwidth size of the 25G optical network unit at the second working wavelength.
The Qos support aspect of the PON system is realized based on a DiffServ differentiated services model. Differentiated services model is a Qos architecture defined by IETF, and is used to divide network traffic into three types, namely accelerated forwarding (Expedited Forwarding, EF), guaranteed forwarding (Assured Forwarding, AF) and Best-Effort (BE), where each type of network traffic has a different differentiated class of service. The EF is the highest-level differentiated service, and is mainly used for simulating delay sensitive service such as virtual leased line, and needs to provide low packet loss rate, low delay and high bandwidth service. The forwarding priority of the AF is lower than EF, and the AF is insensitive to delay requirements and needs certain bandwidth guarantee. BE is the lowest priority differentiated service without any QoS guarantees. Therefore, in the dynamic bandwidth allocation method of the 50G NG-EPON system, differentiated services with respect to different service quality requirements of three services need to be considered on allocation of bandwidth sizes.
As shown in fig. 10, in the service upload module, each optical network unit calculates the authorization bandwidth size of each type of service on the optical network unit according to the allocated authorization bandwidth size, and specifically includes:
a fourth sub-judgment unit for judging the fourth sub-unit kThe size of the authorized bandwidth allocated by the optical network unit is recorded as
Figure SMS_64
Judging->
Figure SMS_65
Whether or not is greater than->
Figure SMS_66
The method comprises the steps of carrying out a first treatment on the surface of the If the service bandwidth is larger than the first service bandwidth, turning to a first service bandwidth authorization unit; otherwise, turning to a second service bandwidth authorization unit;
a first service bandwidth authorizing unit allocated to the first service bandwidthkAuthorized bandwidth size for best effort traffic of an optical network unit
Figure SMS_67
Assigned to the firstkAuthorization bandwidth size for ensuring forwarding traffic for an optical network unit
Figure SMS_68
The method comprises the steps of carrying out a first treatment on the surface of the The remaining licensed bandwidth sizes are all allocated to the expedited forwarding traffic, i.e. the firstkThe authorization bandwidth size of the accelerated forwarding traffic of an optical network unit>
Figure SMS_69
；
A second service bandwidth authorizing unit allocated to the first service bandwidthkAuthorization bandwidth size for accelerated forwarding traffic for an optical network unit
Figure SMS_70
Assigned to the firstkAuthorization bandwidth size for ensuring forwarding traffic for an optical network unit
Figure SMS_71
The method comprises the steps of carrying out a first treatment on the surface of the The remaining grant bandwidth sizes are all allocated to the exhaustionForce to service, i.e. the firstkAuthorized bandwidth size for best effort traffic of an optical network unit>
Figure SMS_72
。
The same or similar reference numerals correspond to the same or similar components;
the terms describing the positional relationship in the drawings are merely illustrative, and are not to be construed as limiting the present patent;
it is to be understood that the above examples of the present invention are provided by way of illustration only and not by way of limitation of the embodiments of the present invention. Other variations or modifications of the above teachings will be apparent to those of ordinary skill in the art. It is not necessary here nor is it exhaustive of all embodiments. Any modification, equivalent replacement, improvement, etc. which come within the spirit and principles of the invention are desired to be protected by the following claims.

Claims (8)

1. A dynamic bandwidth allocation method for a 50G NG-EPON, comprising:
s1: the optical line terminal receives uplink bandwidth request report messages of all optical network units, wherein the uplink bandwidth request report messages comprise IDs of the optical network units and uplink request bandwidth sizes;
s2: the optical line terminal calculates a first maximum bandwidth limit and a second maximum bandwidth limit according to the uplink bandwidth request report messages of all the optical network units;
s3: the optical line terminal judges the type of each optical network unit according to the ID of the optical network unit; if the type of the optical network unit is 25G, executing step S4; if the type of the optical network unit is a 50G optical network unit, executing step S5;
s4: the optical line terminal distributes a first working wavelength to the 25G optical network unit, determines the authorized bandwidth size of the 25G optical network unit according to the relation between the uplink request bandwidth size of the 25G optical network unit and the first maximum bandwidth limit, and executes step S8;
s5: judging whether the uplink request bandwidth of the 50G optical network unit is smaller than a second maximum bandwidth limit; if the number is smaller than the preset number, executing a step S6; otherwise, step S7 is performed:
s6: the optical line terminal allocates a second working wavelength to the 50G optical network unit, takes the uplink request bandwidth size of the 50G optical network unit as the authorized bandwidth size of the 50G optical network unit, and executes step S8;
S7: the optical line terminal limits the second maximum bandwidth as the authorized bandwidth size of the 50G optical network unit, and distributes the first working wavelength and the second working wavelength to the 50G optical network unit; determining the authorized bandwidth size of the 50G optical network unit on the first working wavelength and the authorized bandwidth size of the 50G optical network unit on the second working wavelength according to the relation between the first maximum bandwidth limit and the second maximum bandwidth limit, and executing step S8;
according to the relation between the first maximum bandwidth limit and the second maximum bandwidth limit, the specific method for determining the authorized bandwidth size of the 50G optical network unit on the first working wavelength and the authorized bandwidth size on the second working wavelength is as follows:
s71: judging whether the second maximum bandwidth limit is smaller than 2 times of the first maximum bandwidth limit; if not, executing step S72; otherwise, step S73 is performed;
s72: step S76 is executed by subtracting the first maximum bandwidth limitation by 2 times from the second maximum bandwidth limitation as the authorized bandwidth size of the 50G optical network unit at the first working wavelength;
s73: judging whether the second maximum bandwidth limit is larger than the first maximum bandwidth limit; if yes, go to step S74; otherwise, step S75 is performed;
S74: subtracting the first maximum bandwidth limit from the second maximum bandwidth limit to obtain an authorized bandwidth size of the 50G optical network unit at the first operating wavelength, and executing step S76;
s75: setting the authorized bandwidth of the 50G optical network unit at the first operating wavelength to 0, and executing step S76;
s76: subtracting the authorization bandwidth size of the 50G optical network unit at the first working wavelength from the total authorization bandwidth size of the 50G optical network unit to serve as the authorization bandwidth size of the 50G optical network unit at the second working wavelength;
s8: and each optical network unit calculates the authorized bandwidth size of each type of service on the optical network unit according to the allocated authorized bandwidth size, and uploads the data of each type of service to the optical line terminal according to the allocated working wavelength and in a preset sequence.
2. The dynamic bandwidth allocation method for a 50G NG-EPON of claim 1 wherein the specific method of step S2 is:
the optical line terminal divides all optical network units into two types according to the transmission rate information recorded in the ID of the optical network unit, including a 25G optical network unit and a 50G optical network unit;
averaging the uplink request bandwidth sizes of all the 25G optical network units to obtain a first maximum bandwidth limit:
Figure QLYQS_1
In the method, in the process of the invention,
Figure QLYQS_2
representing a first maximum bandwidth limit, +.>
Figure QLYQS_3
Representing the first in a 25G optical network unitiUplink request bandwidth size of the optical network units;Nrepresenting the number of 25G optical network units, +.>
Figure QLYQS_4
；
Averaging the uplink request bandwidth sizes of all the 50G optical network units to obtain a second maximum bandwidth limit:
Figure QLYQS_5
in the method, in the process of the invention,
Figure QLYQS_6
representing a second maximum bandwidth limit, +.>
Figure QLYQS_7
Representing the first in a 50G optical network unitjUplink request bandwidth size of the optical network units;Mrepresenting the number of 25G optical network units; />
Figure QLYQS_8
；
And, in addition, the processing unit,M+N=K，Krepresenting the total number of optical network units in the 50G NG-EPON.
3. The method for dynamic bandwidth allocation for a 50G NG-EPON of claim 1, wherein in step S4, the specific method for determining the authorized bandwidth size of the 25G optical network unit according to the uplink request bandwidth size and the first maximum bandwidth limit relationship of the 25G optical network unit is as follows:
s41: judging whether the uplink request bandwidth of the 25G optical network unit is smaller than a first maximum bandwidth limit; if yes, go to step S42; otherwise, step S43 is performed;
s42: taking the uplink request bandwidth size of the 25G optical network unit as the authorized bandwidth size of the 25G optical network unit on the first working wavelength;
S43: the first maximum bandwidth limit is used as an authorized bandwidth size of the 25G optical network unit on a first operating wavelength.
4. The dynamic bandwidth allocation method for a 50G NG-EPON of claim 1 wherein said types of traffic include expedited forwarding traffic, assured forwarding traffic, and best effort traffic;
the uplink request bandwidth size of each optical network unit is composed of the uplink request bandwidth size of the accelerated forwarding service, the uplink request bandwidth size of the guaranteed forwarding service and the uplink request bandwidth size of the best effort service, namely:
Figure QLYQS_9
in the method, in the process of the invention,
Figure QLYQS_10
represent the firstkUplink request bandwidth size of an optical network unit,/-for each optical network unit>
Figure QLYQS_11
Represent the firstkUplink request bandwidth size of accelerated forwarding service of an Optical Network Unit (ONU)>
Figure QLYQS_12
Represent the firstkThe uplink request bandwidth size of the personal optical network unit for ensuring forwarding service is +.>
Figure QLYQS_13
Represent the firstkThe uplink request bandwidth size of best effort traffic of the optical network units.
5. The method for dynamic bandwidth allocation for a 50G NG-EPON of claim 4 wherein in step S8, each optical network unit calculates the authorized bandwidth size for each type of service on the optical network unit according to the allocated authorized bandwidth size by:
S81: will be the firstkThe size of the authorized bandwidth allocated by the optical network unit is recorded as
Figure QLYQS_14
Judging->
Figure QLYQS_15
Whether or not is greater than->
Figure QLYQS_16
The method comprises the steps of carrying out a first treatment on the surface of the If yes, go to step S83; otherwise, executeLine step S82;
s82: assigned to the firstkAuthorized bandwidth size for best effort traffic of an optical network unit
Figure QLYQS_17
Assigned to the firstkThe authorization bandwidth size of the personal optical network unit for ensuring forwarding traffic is +.>
Figure QLYQS_18
The method comprises the steps of carrying out a first treatment on the surface of the The remaining licensed bandwidth sizes are all allocated to the expedited forwarding traffic, i.e. the firstkAuthorization bandwidth size for accelerated forwarding traffic for an optical network unit
Figure QLYQS_19
；
S83: assigned to the firstkAuthorization bandwidth size for accelerated forwarding traffic for an optical network unit
Figure QLYQS_20
Assigned to the firstkThe authorization bandwidth size of the personal optical network unit for ensuring forwarding traffic is +.>
Figure QLYQS_21
The method comprises the steps of carrying out a first treatment on the surface of the The remaining licensed bandwidth sizes are all allocated to best effort traffic, i.e. the firstkAuthorized bandwidth size for best effort traffic of an optical network unit>
Figure QLYQS_22
。
6. A dynamic bandwidth allocation system for a 50G NG-EPON, comprising:
the request receiving module is used for receiving uplink bandwidth request report messages of all optical network units by the optical line terminal, wherein the uplink bandwidth request report messages comprise the IDs of the optical network units and the uplink request bandwidth sizes;
the bandwidth limit calculation module is used for calculating a first maximum bandwidth limit and a second maximum bandwidth limit according to the uplink bandwidth request report messages of all the optical network units by the optical line terminal;
The first judging module is used for judging the type of each optical network unit according to the ID of the optical network unit by the optical line terminal; if the type of the optical network unit is 25G optical network unit, turning to a first distribution module; if the type of the optical network unit is a 50G optical network unit, the method goes to a second judging module;
the first allocation module is used for allocating a first working wavelength to the 25G optical network unit by the optical line terminal, determining the authorized bandwidth size of the 25G optical network unit according to the uplink request bandwidth size of the 25G optical network unit and a first maximum bandwidth limiting relation, and transferring to the service uploading module;
a second judging module, configured to judge whether the uplink request bandwidth size of the 50G optical network unit is smaller than a second maximum bandwidth limit; if the number is smaller than the first distribution module, the second distribution module is switched to; otherwise, go to the third allocation module:
the second allocation module is configured to allocate a second working wavelength to the 50G optical network unit by using the optical line terminal, and transfer the uplink request bandwidth size of the 50G optical network unit to the service upload module as the authorized bandwidth size of the 50G optical network unit;
a third allocation module, configured to allocate a first operating wavelength and a second operating wavelength to the 50G optical network unit by using the second maximum bandwidth limitation as an authorized bandwidth size of the 50G optical network unit by using the optical line terminal; determining the authorized bandwidth size of the 50G optical network unit on the first working wavelength and the authorized bandwidth size of the 50G optical network unit on the second working wavelength according to the relation between the first maximum bandwidth limit and the second maximum bandwidth limit, and transferring to a service uploading module;
In the third allocation module, determining the authorized bandwidth size of the 50G optical network unit on the first working wavelength and the authorized bandwidth size on the second working wavelength according to the relation between the first maximum bandwidth limit and the second maximum bandwidth limit specifically includes:
a second sub-judgment unit configured to judge whether the second maximum bandwidth limit is less than 2 times the first maximum bandwidth limit; if not, turning to a third sub-bandwidth authorization unit; otherwise, turning to a third sub-judging unit;
a third sub-bandwidth authorization unit, which uses the second maximum bandwidth limit minus 2 times of the first maximum bandwidth limit as the authorized bandwidth of the 50G optical network unit at the first working wavelength, and transfers to a sixth sub-bandwidth authorization unit;
a third sub-judging unit for judging whether the second maximum bandwidth limit is greater than the first maximum bandwidth limit; if the bandwidth is larger than the first bandwidth, the fourth bandwidth is transferred to a fourth sub-bandwidth authorization unit; otherwise, turning to a fifth sub-bandwidth authorizing unit;
a fourth sub-bandwidth grant unit, which uses the second maximum bandwidth limit minus the first maximum bandwidth limit as the grant bandwidth of the 50G optical network unit at the first working wavelength, and transfers to a sixth sub-bandwidth grant unit;
A fifth sub-bandwidth authorization unit, configured to set the authorization bandwidth of the 50G optical network unit at the first operating wavelength to 0, and switch to a sixth sub-bandwidth authorization unit;
a sixth sub-bandwidth authorization unit, which uses the total authorization bandwidth size of the 50G optical network unit minus the authorization bandwidth size of the 50G optical network unit at the first operating wavelength as the authorization bandwidth size of the 50G optical network unit at the second operating wavelength;
and the service uploading module is used for calculating the authorized bandwidth sizes of various types of services on the optical network unit according to the allocated authorized bandwidth sizes by each optical network unit, and uploading the data of the various types of services to the optical line terminal according to the allocated working wavelength in a preset sequence.
7. The dynamic bandwidth allocation system for a 50G NG-EPON of claim 6 wherein said first allocation module determines an authorized bandwidth size for the 25G optical network unit based on an uplink request bandwidth size for the 25G optical network unit and a first maximum bandwidth limit relationship, specifically comprising:
a first sub-judging unit, configured to judge whether the uplink request bandwidth size of the 25G optical network unit is smaller than a first maximum bandwidth limit; if the bandwidth is smaller than the first bandwidth, turning to a first sub-bandwidth authorization unit; otherwise, turning to a first sub-bandwidth authorization unit;
The first sub-bandwidth authorization unit is used for taking the uplink request bandwidth size of the 25G optical network unit as the authorization bandwidth size of the 25G optical network unit on a first working wavelength;
and the second sub-bandwidth authorization unit is used for limiting the first maximum bandwidth as the authorized bandwidth size of the 25G optical network unit on the first working wavelength.
8. The dynamic bandwidth allocation system for a 50G NG-EPON of claim 6 wherein said traffic upload modules include types of traffic including expedited forwarding traffic, assured forwarding traffic, and best effort traffic;
the uplink request bandwidth size of each optical network unit is composed of the uplink request bandwidth size of the accelerated forwarding service, the uplink request bandwidth size of the guaranteed forwarding service and the uplink request bandwidth size of the best effort service, namely:
Figure QLYQS_23
in the method, in the process of the invention,
Figure QLYQS_24
represent the firstkUplink request bandwidth size of an optical network unit,/-for each optical network unit>
Figure QLYQS_25
Represent the firstkUplink request bandwidth size of accelerated forwarding service of an Optical Network Unit (ONU)>
Figure QLYQS_26
Represent the firstkThe uplink request bandwidth size of the personal optical network unit for ensuring forwarding service is +.>
Figure QLYQS_27
Represent the firstkThe uplink request bandwidth size of best effort service of the optical network unit;
Each optical network unit calculates the authorized bandwidth size of each type of service on the optical network unit according to the allocated authorized bandwidth size, and specifically includes:
a fourth sub-judgment unit for judging the fourth sub-unitkThe size of the authorized bandwidth allocated by the optical network unit is recorded as
Figure QLYQS_28
Judging->
Figure QLYQS_29
Whether or not is greater than->
Figure QLYQS_30
The method comprises the steps of carrying out a first treatment on the surface of the If the service bandwidth is larger than the first service bandwidth, turning to a first service bandwidth authorization unit; otherwise, turning to a second service bandwidth authorization unit;
a first service bandwidth authorizing unit allocated to the first service bandwidthkAuthorized bandwidth size for best effort traffic of an optical network unit
Figure QLYQS_31
Assigned to the firstkThe authorization bandwidth size of the personal optical network unit for ensuring forwarding traffic is +.>
Figure QLYQS_32
The method comprises the steps of carrying out a first treatment on the surface of the The remaining licensed bandwidth sizes are all allocated to the expedited forwarding traffic, i.e. the firstkThe authorization bandwidth size of the accelerated forwarding traffic of an optical network unit>
Figure QLYQS_33
；
A second service bandwidth authorizing unit allocated to the first service bandwidthkAuthorization bandwidth size for accelerated forwarding traffic for an optical network unit
Figure QLYQS_34
Assigned to the firstkAuthorization bandwidth size for ensuring forwarding traffic for an optical network unit
Figure QLYQS_35
The method comprises the steps of carrying out a first treatment on the surface of the The remaining licensed bandwidth sizes are all allocated to best effort traffic, i.e. the firstkAuthorized bandwidth size for best effort traffic of an optical network unit>
Figure QLYQS_36
。
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