CN111464890B - Dynamic bandwidth allocation method for network slice and OLT (optical line terminal) - Google Patents

Dynamic bandwidth allocation method for network slice and OLT (optical line terminal) Download PDF

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CN111464890B
CN111464890B CN202010247476.0A CN202010247476A CN111464890B CN 111464890 B CN111464890 B CN 111464890B CN 202010247476 A CN202010247476 A CN 202010247476A CN 111464890 B CN111464890 B CN 111464890B
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CN111464890A (en
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吴浩
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China Information And Communication Technology Group Co ltd
Fiberhome Telecommunication Technologies Co Ltd
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China Information And Communication Technology Group Co ltd
Fiberhome Telecommunication Technologies Co Ltd
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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
    • 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
    • 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
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    • H04Q2011/0086—Network resource allocation, dimensioning or optimisation

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Abstract

A dynamic bandwidth allocation method of network slice and OLT relate to the DBA method of PON system, including: a1. setting the service quality grade of each network slice, and establishing a corresponding relation with the T-CONT; configuring the residual bandwidth scheduling type of the T-CONT as none, NA or BE; a2. according to the bandwidth demand collected in the last DBA period of each T-CONT, the bandwidth of the current DBA period is distributed to the network slice, and the bandwidth distributed by each T-CONT is not more than the sum of the fixed bandwidth and the guaranteed bandwidth; a3. if the PON port has unallocated bandwidth, sequentially meeting the bandwidth requirements of the T-CONT with the residual bandwidth scheduling type of NA according to the service quality grade; a4. and if the PON port still has unallocated bandwidth, sequentially meeting the bandwidth requirements of the T-CONT with the residual bandwidth scheduling type BE according to the service quality grade. The invention provides differentiated quality assurance service for different network slice users.

Description

Dynamic bandwidth allocation method for network slice and OLT (optical line terminal)
Technical Field
The invention relates to a Dynamic Bandwidth Allocation (DBA) method of a Passive Optical Network (PON) system, in particular to a Dynamic Bandwidth Allocation method of a Network slice and an OLT.
Background
A PON access network is an all-optical access network of a point-to-multipoint architecture. The Optical Network Unit adopts passive Optical fiber transmission, can simultaneously carry various services such as data, voice, video and the like, and mainly comprises an Optical Line Terminal (OLT), an Optical Network Unit (ONU) and an Optical Distribution Network (ODN).
Due to the point-to-multipoint nature of PON access networks, PON networks are seen as a very economical access technology and are popular. An operator can access a plurality of ONUs through the ODN under one PON port, and the ONUs share the PON link of the OLT. In the uplink direction, a Time-division multiplexing (TDM) mode is usually adopted to realize that multiple ONUs share an uplink. The OLT uses a Dynamic Bandwidth Allocation (DBA) function to allocate time slots for each ONU, and the ONUs can only send data in the given time slots, so that uplink collision is avoided. Various services in the PON network are carried using GemPort, and the granularity of the upstream bandwidth scheduling is a scheduling Container (T-CONT). A T-CONT may contain one or more gemports. According to a Fixed bandwidth (FIR), a guaranteed bandwidth (CIR), a maximum bandwidth (Peak Information Rate, PIR) and an uplink channel bandwidth of a PON port, which are defined in a Service Level Agreement (SLA) of each T-CONT, the OLT can dynamically calculate the bandwidth allocation of each uplink T-CONT, so as to realize an optimized uplink Service quality guarantee function.
Although shared access by multiple users is achieved through ODNs, the cost of infrastructure (particularly ODN networks) is still high for operators. If the reuse degree of the infrastructure of the basic network can be improved, a plurality of operators can share one network, and the network construction cost can be greatly reduced. Therefore, the network slicing function of the PON system can be introduced, and the reusability of the OLT apparatus can be further improved. The physical OLT is divided into a plurality of logic slices, service forwarding and configuration management among the slices are independent, and an application scene that multiple tenants (virtual operators) share OLT equipment is realized. In such applications, slice Service Level Agreements (SLAs) for different tenants are different. Slices that serve high-value, government-enterprise users, for example, typically require more bandwidth, lower latency; while a home user slice serving a common value requires only a lower traffic priority. When providing network slices for each tenant, the infrastructure network provider also needs to guarantee the service quality level of the slices according to the user value. When multiple tenants share one ODN, the network slices are divided at the granularity of ONUs, and the same PON port may belong to multiple network slices.
However, the service quality of the existing OLT device is realized based on the physical PON port, and the service quality between slices cannot be guaranteed when the PON port is shared by multiple slices. The concrete expression is as follows: the Dynamic Bandwidth Allocation (DBA) algorithm of the OLT schedules and allocates bandwidth for all T-CONT in the entire PON port, which results in that all slices can only be scheduled in an undifferentiated mixed manner, and cannot schedule bandwidth required by a high-value slice user in priority, or perform delay optimization for the high-value slice user.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a dynamic bandwidth allocation method of network slices and an OLT (optical line terminal) to provide differentiated quality assurance services for different network slice users.
In order to achieve the above object, in one aspect, a method for dynamically allocating bandwidth of a network slice is adopted, which includes the steps of:
a1. setting the service quality grade of each network slice, and establishing a corresponding relation between a scheduling container T-CONT and the network slices; configuring the residual bandwidth scheduling type of the T-CONT as no residual bandwidth none, no guaranteed bandwidth NA or best effort bandwidth BE;
a2. according to the bandwidth demand collected in the last dynamic bandwidth allocation DBA period of each T-CONT, the bandwidth of the current DBA period is allocated to the network slice, and the bandwidth allocated to each T-CONT is not more than the sum of the fixed bandwidth and the guaranteed bandwidth of the T-CONT;
a3. if the PON port of the passive optical network has unallocated bandwidth, sequentially meeting the bandwidth requirement of the T-CONT with the residual bandwidth scheduling type of NA according to the service quality grade of each network slice;
a4. and if the PON port still has unallocated bandwidth, sequentially meeting the bandwidth requirement of the T-CONT with the residual bandwidth scheduling type BE according to the service quality grade of each network slice.
Preferably, in the step a1, a DBA scheduling parameter vector is configured for the T-CONT, where the DBA scheduling parameter vector includes a fixed bandwidth, a guaranteed bandwidth, a maximum bandwidth, and a remaining bandwidth scheduling type;
each network slice is identified by an index, the DBA scheduling parameter vector further comprises a parameter which represents the index of the network slice to which the T-CONT belongs, and each T-CONT uniquely belongs to one network slice.
Preferably, for each T-CONT belonging to one slice, the sum of the fixed bandwidth configuration and the guaranteed bandwidth configuration is not more than the maximum bandwidth configuration; and the sum of the fixed bandwidth configuration and the guaranteed bandwidth configuration of all the T-CONT is not more than the total bandwidth of the PON port.
Preferably, the step a2 includes: reading the bandwidth requirements of all T-CONT under the corresponding PON port collected by the OLT in the last DBA period:
if the bandwidth requirement is less than the sum of the fixed bandwidth and the guaranteed bandwidth, the bandwidth allocated to the T-CONT is the bandwidth required by the T-CONT; otherwise, the bandwidth allocated to the T-CONT is equal to the sum of the fixed bandwidth and the guaranteed bandwidth of the T-CONT.
Preferably, the service quality level of the network slice is represented by a priority and a weight, and the higher the priority is, the higher the service quality level of the corresponding network slice is; the higher the weight of the network slice with the same priority, the higher the service quality level.
Preferably, the unallocated bandwidth in step a3 is an unallocated guaranteed bandwidth allocable to the PON port, and is the sum of the bandwidths allocated by all the T-CONT according to step a2 subtracted from the total bandwidth of the PON port;
processing each network slice according to the priority from high to low, sequentially meeting the requirement of T-CONT with the residual bandwidth scheduling type of NA in each network slice, and updating the residual value of the bandwidth which can be distributed by the PON port and is not guaranteed;
and allocating the network slices with the same priority according to the weight proportion without ensuring the bandwidth.
Preferably, for each network slice indexed by i, all remaining bandwidth scheduling types x in the network sliceABT-CONT of NAjBandwidth R allocated in period tj(t) is:
Figure BDA0002434329360000041
wherein j is the index of T-CONT, and j is epsilon { Ij＝i}，IjThe index of the network slice to which the T-CONT belongs takes values of 1-N,
Figure BDA0002434329360000042
to be configured for T-CONTjThe maximum bandwidth of the first channel and the second channel,
Figure BDA0002434329360000043
to be configured for T-CONTjThe fixed bandwidth of the network,
Figure BDA0002434329360000044
for each T-CONT in the period TjBandwidth requirement ofSolving;
if T-CONTjThe bandwidth can be satisfied, then
Figure BDA0002434329360000045
Continuing to process the next T-CONT in the network slice, wherein
Figure BDA0002434329360000046
Allocating an unqualified bandwidth for the network slice i;
otherwise, stopping updating the bandwidth of the T-CONT in the network slice and continuing to process the next network slice until all network slices are processed or the residual bandwidth S which is not guaranteed and is totally available at the PON portNA(t) total depletion;
the above-mentioned
Figure BDA0002434329360000047
Figure BDA0002434329360000048
And configuring the bandwidth for guaranteeing.
Preferably, the unallocated bandwidth in step a4 is the best effort bandwidth allocable by the PON port, and is the sum of the bandwidths allocated by all T-CONT according to step a2 and step a3 and subtracted from the total bandwidth of the PON port;
processing each network slice according to the priority from high to low, sequentially meeting the requirement of T-CONT with BE type of residual bandwidth scheduling in each network slice, and updating the best effort bandwidth residual value allocable by a PON port;
and allocating best-effort bandwidth according to the proportion of the weight for the network slices with the same priority.
Preferably, for each network slice indexed by i, all remaining bandwidth scheduling types χ within the network sliceABBE's T-CONTjBandwidth R ofj(t) is:
Figure BDA0002434329360000051
wherein j is the index of T-CONT, and j is epsilon{IjI is the index of the network slice to which the T-CONT belongs, and takes values from 1 to N,
Figure BDA0002434329360000052
to be configured for T-CONTjThe maximum bandwidth of the first channel and the second channel,
Figure BDA0002434329360000053
to be configured for T-CONTjThe fixed bandwidth of the network,
Figure BDA0002434329360000054
for each T-CONT in the period TjThe bandwidth requirement of (d);
if T-CONTjThe bandwidth can be satisfied, then
Figure BDA0002434329360000055
And continuing to process the next T-CONT within the network slice, wherein,
Figure BDA0002434329360000056
the best effort bandwidth which can be allocated is left for the network slice i;
otherwise, stopping the bandwidth updating of the T-CONT in the network slice and continuing to process the next network slice until all the network slices are processed or the residual best effort bandwidth S which is totally available at the PON port is processedBE(t) total depletion;
the above-mentioned
Figure BDA0002434329360000057
Figure BDA0002434329360000058
And configuring the bandwidth for guaranteeing.
Preferably, the OLT converts the bandwidth allocated by each T-CONT in the T-th period into bandwidth allocation parameters, including the number AB of upstream bytes allocated in each frame and the service interval SI of the T-CONT, generates a bandwidth bitmap BWmap and sends the bandwidth bitmap BWmap to the ONU;
the higher the priority of the network slice is, the lower the value of SI is, and the value of SI is a multiple of 125 us; and ABj＝Rj(t)*SIjWhere j is the number of T-CONT, Rj(T) is the bandwidth allocated for the T-CONT in the T-th period.
In another aspect, an OLT applied to the above network slice dynamic bandwidth allocation method is provided, including:
the configuration module is used for setting the service quality grade of each network slice and establishing the corresponding relation between the scheduling container T-CONT and the network slices; configuring the residual bandwidth scheduling type of the T-CONT as no residual bandwidth none, no guaranteed bandwidth NA or best effort bandwidth BE;
the first bandwidth allocation module is used for allocating the bandwidth requirement collected in the DBA period according to the last dynamic bandwidth of each T-CONT, allocating the bandwidth of the current DBA period to the network slice, and enabling the bandwidth allocated by each T-CONT to be not more than the sum of the fixed bandwidth and the guaranteed bandwidth of the T-CONT;
the second bandwidth allocation module is used for sequentially meeting the bandwidth requirement of the T-CONT with the residual bandwidth scheduling type of NA according to the service quality grade of each network slice when the PON port has unallocated bandwidth after the first bandwidth allocation module is allocated;
and the third bandwidth allocation module is used for sequentially meeting the bandwidth requirement of the T-CONT with the residual bandwidth scheduling type being BE according to the service quality grade of each network slice when the PON port has unallocated bandwidth after the second bandwidth allocation module is allocated.
The technical scheme has the following beneficial effects: assigning T-CONT to the network slices by setting service quality grades of different network slices, and preferentially ensuring the T-CONT in the high-priority slices to obtain residual bandwidth scheduling when calculating the residual bandwidth; the bandwidth is distributed in proportion by weight in the same priority, operators can provide differentiated quality guarantee services for different network slice users while fully sharing access network infrastructure by utilizing network slices, and particularly high-value network slice users can provide high-quality guarantee services.
Furthermore, according to the priority of the network slice, the bandwidth service interval in the DBA period is adjusted, and the forwarding time delay of the service in the high-priority slice is reduced.
Drawings
FIG. 1 is a flow chart of a method for dynamic bandwidth allocation of network slices according to an embodiment of the present invention;
fig. 2 is a schematic view of a multi-tenant application scenario based on a PON system network slice according to an embodiment of the present invention;
fig. 3 is a flowchart of a dynamic bandwidth allocation method for network slices according to another embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples.
As shown in fig. 1, an embodiment of a method for dynamic bandwidth allocation of a network slice is provided, which includes the steps of:
a1. and setting the service quality grade of each network slice, and establishing the corresponding relation between the T-CONT and the network slices.
Preferably, the service quality levels of the network slices are represented by priorities and weights, for example, the priorities include 8 levels of 0 to 7; in this embodiment, the greater the sequence number of the priority, the higher the service quality level of the corresponding network slice; in other embodiments, the smaller the sequence number of the priority, the higher the quality of service level of the corresponding network slice. The higher the weight of the network slice with the same priority, the higher the service quality level.
Furthermore, the network slices of the OLT are identified by indexes of 1-N, wherein N is the maximum number of the network slices supported by the PON system. And configuring the DBA scheduling parameter vector of the T-CONT, wherein the DBA scheduling parameter vector comprises a fixed bandwidth, a guaranteed bandwidth, a maximum bandwidth and a residual bandwidth scheduling type. The residual bandwidth scheduling types comprise non-allocation of residual bandwidth none, allocation of non-guaranteed bandwidth NA (none-allocated) and allocation of best-effort bandwidth BE (best-effort); the residual bandwidth scheduling type takes one of { none, NA and BE } as a value. In addition, the DBA scheduling parameter vector further includes a new parameter for indicating an index of the network slice to which the T-CONT belongs, and each T-CONT uniquely belongs to one network slice; and associating the T-CONT with the network slice through the new parameters.
a2. And according to the bandwidth demand collected in the last DBA period of each T-CONT, allocating the bandwidth of the current DBA period to the network slice, and enabling the bandwidth allocated to each T-CONT not to be larger than the sum of the fixed bandwidth and the guaranteed bandwidth of the T-CONT. In addition, if the period is the first DBA period, the service bandwidth is not distributed to the network slice, and only the bandwidth request of the ONU is acquired.
Specifically, in each DBA cycle, the bandwidth requirements of all T-CONT devices under the corresponding PON port collected by the OLT in the previous DBA cycle are read. And then, performing the first round of bandwidth calculation, namely, calculating the bandwidth allocated to each T-CONT in the DBA period according to the bandwidth requirement and the DBA scheduling parameter vector. The method for calculating the bandwidth of the first wheel comprises the following steps: if the bandwidth requirement of the T-CONT is less than the sum of the fixed bandwidth and the guaranteed bandwidth, the bandwidth allocated to the T-CONT is the required bandwidth; otherwise, the bandwidth allocated to the T-CONT is equal to the sum of the fixed bandwidth and the guaranteed bandwidth of the T-CONT.
a3. And if the PON port of the passive optical network has unallocated bandwidth, sequentially meeting the bandwidth requirement of the T-CONT with the residual bandwidth scheduling type of NA according to the service quality grade of each network slice.
Specifically, after the first round of bandwidth calculation is completed, the unallocated guaranteed bandwidth of the PON port is calculated, which is equal to the sum of the total bandwidth of the PON port minus the bandwidth allocated by the T-CONT first round of bandwidth calculation. And if the allocable bandwidth of the PON port is larger than 0, performing bandwidth calculation in a second round.
An embodiment of a second wheel bandwidth calculation method is provided, comprising: and processing each slice according to the sequence of the priority of the network slices from top to bottom, using the unallocated guaranteed bandwidth allocable by the PON port to satisfy all the T-CONT with the residual bandwidth scheduling type of NA in the slice, and updating the unallocated guaranteed bandwidth residual value of the PON port. The meaning of "satisfying" above is: the bandwidth value allocated to the T-CONT reaches the bandwidth requirement of the T-CONT, or reaches the maximum bandwidth limit of the T-CONT. And processing the network slices with low priority only after the T-CONT in the network slices with high priority are all satisfied. For the network slices with the same priority, the allocable non-guaranteed bandwidth is allocated according to the proportion of the weight. And if the allocable bandwidth of the PON port is exhausted, the bandwidth calculation of the second round is finished.
a4. And if the PON port still has unallocated bandwidth, sequentially meeting the bandwidth requirement of the T-CONT with the residual bandwidth scheduling type BE according to the service quality grade of each network slice.
Specifically, after the second round of bandwidth calculation is completed, the best effort bandwidth allocable for the PON port is calculated, which is equal to the sum of the total bandwidth of the PON port minus the bandwidths allocated in the first two rounds of T-CONT. And if the best-effort bandwidth allocable by the PON port is larger than 0, performing a third round of bandwidth calculation.
An embodiment of a third round bandwidth calculation method is provided, comprising: and processing each slice according to the sequence of the priority of the network slices from top to bottom, sequentially satisfying the T-CONT with the residual bandwidth scheduling type BE in each network slice by using the best-effort bandwidth allocable by the PON port, and simultaneously updating the best-effort bandwidth residual value allocable by the PON port. The meaning of "satisfy" in this example is: the bandwidth value allocated to the T-CONT reaches the bandwidth requirement of the T-CONT, or reaches the maximum bandwidth limit of the T-CONT. And processing the network slices with low priority only after the T-CONT in the network slices with high priority are all satisfied. For network slices with the same priority, the best-effort bandwidth which can be allocated is allocated according to the proportion of the weight. If the best effort bandwidth allocable by the PON port is exhausted, the third round of bandwidth calculation is finished.
On the basis of the above embodiments, an embodiment for reducing network slice forwarding delay is provided. After the step a4, the OLT calculates the upstream byte number (AB) and Service Interval (SI) allocated to each T-CONT in each frame of the DBA scheduling period according to the priority of the network slice, the bandwidth allocated to each T-CONT, and the length of the DBA scheduling period, and generates BWMap (bandwidth map) which is a bandwidth bitmap issued by the OLT to the ONU in the GPON standard and indicates the upstream data transmission time and length of the ONU, and transmits the BWMap to the ONU. The value of the SI is a multiple of 125us, and for a network slice, the higher the priority is, the smaller the value of the SI is, so as to reduce the forwarding delay of the network slice service; the lower the priority of the network slice is, the larger the value of the SI can be, and the priority guarantee is not made for the time delay of the network slice service.
The present invention further provides an embodiment of an OLT, which is applicable to the dynamic bandwidth allocation method for the network slice, where the OLT in this embodiment includes a configuration module, a first bandwidth allocation module, a second bandwidth allocation module, and a third bandwidth allocation module.
The configuration module is used for setting the service quality grade of each network slice and establishing the corresponding relation between the scheduling container T-CONT and the network slices; and configuring the residual bandwidth scheduling type of the T-CONT as no residual bandwidth none, no guaranteed bandwidth NA or best effort bandwidth BE.
And the first bandwidth allocation module is used for allocating the bandwidth of the current DBA period to the network slice according to the bandwidth requirement collected by the last dynamic bandwidth allocation DBA period of each T-CONT, and enabling the bandwidth allocated by each T-CONT not to be larger than the sum of the fixed bandwidth and the guaranteed bandwidth of the T-CONT.
And the second bandwidth allocation module is used for sequentially meeting the bandwidth requirement of the T-CONT with the residual bandwidth scheduling type of NA according to the service quality grade of each network slice when the PON port has unallocated bandwidth after the first bandwidth allocation module is allocated.
And the third bandwidth allocation module is used for sequentially meeting the bandwidth requirement of the T-CONT with the residual bandwidth scheduling type being BE according to the service quality grade of each network slice when the PON port has unallocated bandwidth after the second bandwidth allocation module is allocated.
As shown in fig. 2, an embodiment of a multi-tenant application scenario based on PON system network slices is provided. The PON access network comprises OLT equipment at a local side, ODN and ONU equipment at a far end, and the OLT and the ONU are connected through the ODN. In this embodiment, a VNO (Virtual Network Operator)1And VNO2And sharing an OLT PON port and an ODN in a physical access network through a PON network slice technology. In this embodiment, the virtual operators correspond to the network slices one to one, and the VNO1The network slice is high priority, and the corresponding network slice is high priority; VNO2Is generic priority, the corresponding network slice is also generic priority, lower than the VNO1Corresponding network slice priority. VNO1Use the netNetwork slice 1 carries traffic, whose subscribers include ONUs1～ONUm(ii) a Virtual operator VNO2Using network slice 2 to carry traffic, its subscribers include ONUsm+1～ONUn. Two virtual network operators independently develop service operation, but all users share bandwidth resources of the PON port. In particular, VNO1Serving high value users and therefore a limited quality of service guarantee can be obtained by the method in the above embodiment.
As shown in fig. 3, another embodiment of a method for dynamic bandwidth allocation for a network slice is provided, comprising the steps of:
s1, defining service quality grade for the network slice of the OLT. And indexing the network slices, wherein the range of the index i is 1-N, and N is the number of the maximum network slices supported by the PON system. Defining a vector V for each network sliceiAnd is used to indicate the quality of service of the network slice.
Vi＝(Pi,wi)
Wherein, PiRepresenting the priority, and the value from low to high is 0-7; w is aiRepresenting the weight of the network slice at the same priority.
S2, assigning T-CONT for each service flow and configuring each T-CONTjDBA scheduling parameter vector Dj：
Figure BDA0002434329360000111
Wherein j is the index of T-CONT, the value range is 1-TCONT total number,
Figure BDA0002434329360000112
to be configured to the T-CONTjA fixed bandwidth of;
Figure BDA0002434329360000113
to be configured to the T-CONTjThe guaranteed bandwidth of (2);
Figure BDA0002434329360000114
to be configured to the T-CONTjMaximum bandwidth of;
Figure BDA0002434329360000115
is the T-CONTjThe value of the residual bandwidth scheduling type is one of { none, NA and BE }; none indicates that the remaining bandwidth is not allocated, NA indicates that the non-guaranteed bandwidth is allocated, and BE indicates that the best-effort bandwidth is allocated; i isjIs the T-CONTjAnd the index of the belonged network slice takes a value of 1-N.
For each T-CONTjThe above parameters need to satisfy the following constraints:
Figure BDA0002434329360000121
if xABWhen being NA, then
Figure BDA0002434329360000122
If xABBE, then
Figure BDA0002434329360000123
Figure BDA0002434329360000124
Wherein the content of the first and second substances,
Figure BDA0002434329360000125
is T-CONTjThe fixed bandwidth configuration of (a) is,
Figure BDA0002434329360000126
is T-CONTjThe configuration of the guaranteed bandwidth of (a),
Figure BDA0002434329360000127
is T-CONTjMaximum bandwidth configuration. The meaning of the above constraints is: for each T-CONT attributed to a network slice ijWhich is
Figure BDA0002434329360000128
Of all T-CONT
Figure BDA0002434329360000129
And
Figure BDA00024343293600001210
the sum should not be greater than the total bandwidth (C) of the PON port.
And S3, periodically executing DBA dynamic bandwidth allocation. A DBA period is typically a multiple of the duration (125us) of a GPON frame. In the present embodiment, the DBA period is 1ms (8 frames).
S4, performing first-round bandwidth allocation, wherein each T-CONT in an OLT reading period TjBandwidth requirement of
Figure BDA00024343293600001211
Get each T-CONTjAllocated bandwidth of
Figure BDA00024343293600001212
Figure BDA00024343293600001213
S5, calculating the distributable non-guaranteed bandwidth S of the PON port in the period tNA(t)：
Figure BDA00024343293600001214
And S6, performing second-wheel bandwidth distribution. Priority P of quality of service according to network sliceiSequentially processing all network slices from high to low, and allocating the available bandwidth of the PON port to all residual bandwidth scheduling types xABNA T-CONT.
In the processing of each priority, firstly, the assignable non-guaranteed bandwidth of each network slice i in the priority is determined
Figure BDA00024343293600001215
If the network slice i is the only one network slice in the current priority level, then
Figure BDA00024343293600001216
If there are multiple network slices within the current priority, S is determined according to the weights of the network slicesNA(t) obtaining each network slice
Figure BDA0002434329360000131
For each network slice i (cycle 1), all remaining bandwidth scheduling types x within that network sliceABT-CONT of NAj(j∈{SjI }) (cycle 2) the bandwidth R allocated during period tj(t) is:
Figure BDA0002434329360000132
wherein the content of the first and second substances,
Figure BDA0002434329360000133
for each T-CONT in the period TjI.e. the actual Load (Load).
If T-CONTjThe bandwidth can be satisfied, then slice the remaining non-guaranteed bandwidth of the network i
Figure BDA0002434329360000134
Subtract the value assigned to T-CONTjPart (A) to
Figure BDA0002434329360000135
Is updated to
Figure BDA0002434329360000136
Wherein the content of the first and second substances,
Figure BDA0002434329360000137
for assigning T-CONT in step S4jThen continues processing the next T-CONT within the network slice (continue loop 2); otherwise, the bandwidth of the T-CONT in the network slice is stopped (the loop 2 is skipped), and the next network slice is updated and continuously processed (the loop 1 is continued) until all slices are processed or the residual bandwidth S which is not guaranteed and is totally available in the PON system is processedNA(t) total depletion.
S7, calculating the best effort bandwidth S which can be distributed by the PON port in the period tBE(t)：
Figure BDA0002434329360000138
And S8, carrying out third round of bandwidth allocation. Priority P of quality of service according to network sliceiSequentially processing all network slices from high to low, and allocating the best-effort bandwidth allocable by the PON port to all attributes xABT-CONT of BE. In the processing of each priority, the best-effort bandwidth allocable for all network slices in the priority is first determined
Figure BDA0002434329360000139
If network slice i is the only one within the current priority, then
Figure BDA00024343293600001310
If there are multiple network slices within the current priority, S is determined according to the weights of the network slicesBE(t) obtaining each network slice
Figure BDA0002434329360000141
For each network slice i (cycle 3), all remaining bandwidth scheduling types x within that network sliceABBE's T-CONTj(j∈{IjI } (cycle 4) bandwidth R allocated during period tj(t) is:
Figure BDA0002434329360000142
if T-CONTjThe bandwidth can be satisfied, then the network slice i is left with the best-effort bandwidth allocable
Figure BDA0002434329360000143
Subtract the value assigned to T-CONTjPart (A) to
Figure BDA0002434329360000144
Is updated to
Figure BDA0002434329360000145
Wherein
Figure BDA0002434329360000146
For assigning T-CONT in step S4jThen continues processing the next T-CONT within the network slice (continue loop 3); otherwise, stopping the bandwidth updating of the T-CONT in the network slice (jumping out of the loop 3), and continuing to process the next network slice (continuing to loop 4) until all the network slices are processed or SBE(t) total depletion.
Preferably, on the basis of the above steps, the following steps are further provided:
s9, enabling each T-CONT to be connectedjR of (A) to (B)j(T) converting into bandwidth allocation parameters in the T-th period, including the number of bytes Allocated (AB) in each GPON frame and the T-CONTjService Interval (SI). Specifically, for each network slice i, T-CONT within each network slice i (cycle 5)j(cycle 6), T-CONTjAssociated network slice priority piCalculating T-CONTjThe number of bytes (AB) allocated in each service interval, according to the T-CONTjAnd the Service Interval (SI) and AB of the DBA period.
In this embodiment, in a DBA period of 8 frames, the value of SI may be 1 frame to 8 frames (125us to 1ms) according to T-CONTjAssociated network slice priority piTo be determined. The SI value of the network slice with the highest priority (value of 7) is 125us, the lower the priority, the larger the SI value, and the SI value of the network slice with the lowest priority (value of 0) is 1 ms. The AB value is then calculated according to the following equation:
ABj＝Rj(t)*SIj
and S10, generating a BWMap by the OLT according to the bandwidth allocation condition in each GPON frame, and sending the BWMap to the ONU. Steps S9 and S10 may adjust the bandwidth service interval in the DBA period according to the priority of the network slice, and reduce the forwarding delay of the service in the high-priority slice.
S11, in the period, collecting the bandwidth requirement of each T-CONT in the next period, and turning to S3 to start the DBA process in the next period.
The present invention is not limited to the above-described embodiments, and it will be apparent to those skilled in the art that various modifications and improvements can be made without departing from the principle of the present invention, and such modifications and improvements are also considered to be within the scope of the present invention.

Claims (11)

1. A method for dynamic bandwidth allocation of network slices, comprising the steps of:
a1. setting the service quality grade of each network slice, and establishing a corresponding relation between a scheduling container T-CONT and the network slices; configuring the residual bandwidth scheduling type of the T-CONT as no residual bandwidth none, no guaranteed bandwidth NA or best effort bandwidth BE;
a2. according to the bandwidth demand collected in the last dynamic bandwidth allocation DBA period of each T-CONT, the bandwidth of the current DBA period is allocated to the network slice, and the bandwidth allocated to each T-CONT is not more than the sum of the fixed bandwidth and the guaranteed bandwidth of the T-CONT;
a3. if the PON port of the passive optical network has unallocated bandwidth, sequentially meeting the bandwidth requirement of the T-CONT with the residual bandwidth scheduling type of NA according to the service quality grade of each network slice;
a4. and if the PON port still has unallocated bandwidth, sequentially meeting the bandwidth requirement of the T-CONT with the residual bandwidth scheduling type BE according to the service quality grade of each network slice.
2. The method for dynamic bandwidth allocation of a network slice of claim 1, wherein: in the step a1, configuring a DBA scheduling parameter vector for the T-CONT, where the DBA scheduling parameter vector includes a fixed bandwidth, a guaranteed bandwidth, a maximum bandwidth, and a remaining bandwidth scheduling type;
each network slice is identified by an index, the DBA scheduling parameter vector further comprises a parameter which represents the index of the network slice to which the T-CONT belongs, and each T-CONT uniquely belongs to one network slice.
3. The method for dynamic bandwidth allocation of a network slice of claim 2, wherein: for each T-CONT belonging to one slice, the sum of the fixed bandwidth configuration and the guaranteed bandwidth configuration is not more than the maximum bandwidth configuration; and the sum of the fixed bandwidth configuration and the guaranteed bandwidth configuration of all the T-CONT is not more than the total bandwidth of the PON port.
4. The method for dynamic bandwidth allocation of a network slice according to claim 3, wherein said step a2 comprises:
reading the bandwidth requirements of all T-CONT under the corresponding PON port collected by the OLT in the last DBA period:
if the bandwidth requirement is less than the sum of the fixed bandwidth and the guaranteed bandwidth, the bandwidth allocated to the T-CONT is the bandwidth required by the T-CONT; otherwise, the bandwidth allocated to the T-CONT is equal to the sum of the fixed bandwidth and the guaranteed bandwidth of the T-CONT.
5. The method for dynamic bandwidth allocation of a network slice of claim 1, wherein: the service quality grade of the network slice is represented by priority and weight, and the higher the priority is, the higher the service quality grade of the corresponding network slice is; the higher the weight of the network slice with the same priority, the higher the service quality level.
6. The method of dynamic bandwidth allocation for network slices of claim 5, wherein: the unallocated bandwidth in the step a3 is an unallocated guaranteed bandwidth allocable to the PON port, and is the sum of the bandwidths allocated by all the T-CONT according to the step a2 subtracted from the total bandwidth of the PON port;
processing each network slice according to the priority from high to low, sequentially meeting the requirement of T-CONT with the residual bandwidth scheduling type of NA in each network slice, and updating the residual value of the bandwidth which can be distributed by the PON port and is not guaranteed;
and allocating the network slices with the same priority according to the weight proportion without ensuring the bandwidth.
7. The method of claim 6, wherein for each network slice with index i, all remaining bandwidth scheduling types x in the network sliceABT-CONT of NAjBandwidth R allocated in period tj(t) is:
Figure FDA0002434329350000021
wherein j is the index of T-CONT, and j is epsilon { Ij＝i}，IjThe index of the network slice to which the T-CONT belongs takes values of 1-N,
Figure FDA0002434329350000022
to be configured for T-CONTjThe maximum bandwidth of the first channel and the second channel,
Figure FDA0002434329350000023
to be configured for T-CONTjThe fixed bandwidth of the network,
Figure FDA0002434329350000024
for each T-CONT in the period TjThe bandwidth requirement of (d);
if T-CONTjThe bandwidth can be satisfied, then
Figure FDA0002434329350000025
Continuing to process the next T-CONT in the network slice, wherein
Figure FDA0002434329350000031
Allocating an unqualified bandwidth for the network slice i;
otherwise, stopping updating the bandwidth of the T-CONT in the network slice and continuing to process the next network slice until all network slices are processed or the residual bandwidth S which is not guaranteed and is totally available at the PON portNA(t) total depletion;
the above-mentioned
Figure FDA0002434329350000032
Figure FDA0002434329350000033
And configuring the bandwidth for guaranteeing.
8. The method of dynamic bandwidth allocation for network slices of claim 5, wherein: the unallocated bandwidth in the step a4 is the best-effort bandwidth allocable by the PON port, and is the sum of the bandwidths allocated by all the T-CONT according to the step a2 and the step a3 and subtracted from the total bandwidth of the PON port;
processing each network slice according to the priority from high to low, sequentially meeting the requirement of T-CONT with BE type of residual bandwidth scheduling in each network slice, and updating the best effort bandwidth residual value allocable by a PON port;
and allocating best-effort bandwidth according to the proportion of the weight for the network slices with the same priority.
9. The method for dynamic bandwidth allocation of a network slice of claim 8, wherein: for each network slice indexed by i, all remaining bandwidth scheduling types x within that network sliceABBE's T-CONTjBandwidth R ofj(t) is:
Figure FDA0002434329350000034
wherein j is the index of T-CONT, and j is epsilon { IjI is the index of the network slice to which the T-CONT belongs, and takes values from 1 to N,
Figure FDA0002434329350000035
to be configured for T-CONTjThe maximum bandwidth of the first channel and the second channel,
Figure FDA0002434329350000036
to be configured for T-CONTjThe fixed bandwidth of the network,
Figure FDA0002434329350000037
for each T-CONT in the period TjThe bandwidth requirement of (d);
if T-CONTjThe bandwidth can be satisfied, then
Figure FDA0002434329350000038
And continuing to process the next T-CONT within the network slice, wherein,
Figure FDA0002434329350000039
the best effort bandwidth which can be allocated is left for the network slice i;
otherwise, stopping the bandwidth updating of the T-CONT in the network slice and continuing to process the next network slice until all the network slices are processed or the residual best effort bandwidth S which is totally available at the PON port is processedBE(t) total depletion;
the above-mentioned
Figure FDA0002434329350000041
Figure FDA0002434329350000042
And configuring the bandwidth for guaranteeing.
10. The method of dynamic bandwidth allocation for network slices of claim 5, wherein: OLT converts the bandwidth allocated in T period by each T-CONT into bandwidth allocation parameters including upstream byte number AB allocated in each frame and service interval SI of the T-CONT, generates bandwidth bitmap BWmap and sends it to ONU;
the higher the priority of the network slice is, the lower the value of SI is, and the value of SI is a multiple of 125 us; and ABj＝Rj(t)*SIjWhere j is the number of T-CONT, Rj(T) is the bandwidth allocated for the T-CONT in the T-th period.
11. An OLT adapted for use in a method for dynamic bandwidth allocation for a network slice according to any of claims 1-10, comprising:
the configuration module is used for setting the service quality grade of each network slice and establishing the corresponding relation between the scheduling container T-CONT and the network slices; configuring the residual bandwidth scheduling type of the T-CONT as no residual bandwidth none, no guaranteed bandwidth NA or best effort bandwidth BE;
the first bandwidth allocation module is used for allocating the bandwidth requirement collected in the DBA period according to the last dynamic bandwidth of each T-CONT, allocating the bandwidth of the current DBA period to the network slice, and enabling the bandwidth allocated by each T-CONT to be not more than the sum of the fixed bandwidth and the guaranteed bandwidth of the T-CONT;
the second bandwidth allocation module is used for sequentially meeting the bandwidth requirement of the T-CONT with the residual bandwidth scheduling type of NA according to the service quality grade of each network slice when the PON port has unallocated bandwidth after the first bandwidth allocation module is allocated;
and the third bandwidth allocation module is used for sequentially meeting the bandwidth requirement of the T-CONT with the residual bandwidth scheduling type being BE according to the service quality grade of each network slice when the PON port has unallocated bandwidth after the second bandwidth allocation module is allocated.
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