CN101924706B - Gigabit passive optical network (PON) bandwidth management method based on ONU port - Google Patents
Gigabit passive optical network (PON) bandwidth management method based on ONU port Download PDFInfo
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Abstract
The invention discloses a gigabit passive optical network (PON) bandwidth management method based on an ONU port, which comprises the following steps of: an A10 and an ONU sequentially distributes enough bandwidth to the OLT-distributed fixed bandwidth from high to low according the priority levels of different services, and building a corresponding bandwidth resource pool Bn; and an A20 and the ONU secondarily distributes to the same service on the different UN1 ports by means of recovering or borrowing the bandwidth resource from the bandwidth resource pool Bn according to the current status of the port. The method distributes the fixed bandwidth resource to the different services, recovers the bandwidth which is distributed to the ONU-underloaded UNI ports into the same service, memorizes the bandwidth into the ONU bandwidth resource pool, and borrows the bandwidth of the resource pool to the overloaded UNI ports, thereby realizing the bandwidth resource which is more fair and shares the ONU among the different UNI ports of the ONU.
Description
Technical field
The present invention relates to EPON, be specifically related to gigabit passive optical network bandwidth management method based on the ONU port.
Background technology
GPON (Gigabit-Capable PON) technology be based on ITU-T G.984.x the latest generation broadband passive light of standard comprehensively insert standard; Has high bandwidth; High efficiency, large coverage, numerous advantages such as user interface is abundant; Be regarded as realizing that by most of operators the Access Network business is broadband, the desirable technique that synthesization is transformed.
For other PON standard; The GPON standard provides unprecedented high bandwidth; Downstream rate is up to 2.5Gbit/s, and its asymmetric property more can adapt to broadband data service market, and the full-service guarantee of QoS is provided; Carry simultaneously ATM cell with (or) the GEM frame, having well provides the grade of service, supports the ability that QoS guarantees and full-service inserts.When carrying the GEM frame, can the TDM business be mapped in the GEM frame, use 8kHz (the 125 μ s) frame of standard can directly support TDM professional.As the carrier-class technical standard, GPON has also stipulated protection mechanism and the complete OAM(Operation Administration Maintenance) on the Access Network aspect.
Fig. 1 is a kind of basic GPON system block diagram, and is as shown in Figure 1, the GPON system comprise an OLT11, ODN12 and a plurality of ONU13-1,13-2 ..., 13-N, wherein ODN comprises passive optical splitter and optical fiber.OLT11 via ODN12 be connected to ONU13-1, ONU13 ..., ONU13-N, constitute one a bit to the tree network topology structure of multiple spot, realized that a local side apparatus OLT has carried out bidirectional high speed through an optical fiber with a plurality of remote equipment ONU and communicated by letter.Broadcast mode is adopted in the communication of GPON system descending, OLT with afternoon the GEM frame send to each ONU through the ODN Web broadcast, in ONU equipment, come selective reception wherein to issue the GEM frame of oneself, and abandon not one's own GEM frame according to ONU ID; Uplink communication is a burst mode; Each ONU adopts TDMA (Time Division Multiple Access) time division multiplexing mode to conduct interviews; Each ONU sends the GEM frame in by OLT uniform dispatching distributed time slot, thereby has avoided the data collision between each ONU.
GPON is not only PON faster, adopts Dynamic Bandwidth Allocation (DBA) algorithm simultaneously, is that ONU distributes bandwidth according to demand and the SLA SLA of ONU.In the Dynamic Resource Allocation for Multimedia mode, OLT understands congestion situation through inspection from the DBA report of ONU and/or through the monitoring certainly of incoming traffic stream, distributes enough resources then.Fig. 2 is a T-CONT Bandwidth Management model in the GPON system.GPON is with the base unit of T-CONT as flow scheduling, and T-CONT is divided into 5 types, and dissimilar T-CONT has different allocated bandwidth modes, can satisfy different business stream to different qos requirements such as time delay, shake, packet loss.Again bandwidth is divided into 4 types in the standard, is respectively fixed-bandwidth Fixed, guarantees bandwidth Assured, non-assured bandwidth Non-Assured and the bandwidth B est-Effort that does one's best, allocated bandwidth priority descends successively.In bandwidth allocation, the GTC system is according to the T-CONT managed traffic flow, and each T-CONT is identified by Alloc-ID.A T-CONT can comprise one or more GEM Port-ID.The flow load of each T-CONT of OLT monitoring, and the adjustment allocated bandwidth distributes better the PON bandwidth resources.
In the current GPON system, the Dynamic Bandwidth Allocation strategy adopts following mode, and optical network unit ONU is to the state of optical line terminal OLT report oneself and required bandwidth, and OLT carries out Dynamic Bandwidth Allocation according to the data that report to ONU.But there is a shortcoming in this allocated bandwidth strategy, promptly only carries out Dynamic Bandwidth Allocation at the OLT end, and the ONU end is not initiatively participated in Dynamic Bandwidth Allocation except the byte number of waiting for to the OLT report, but adopts the mode of preemptive type to obtain bandwidth resources.When certain ONU can't obtain the more bandwidth resource from other ONU is upward dynamic under specific circumstances; And this moment certain port under the same ONU CU a large amount of bandwidth resources; Cause to guarantee the user's bandwidth resource of other port, thereby caused the unfairness between the user under the same ONU.
Summary of the invention
In order to solve the problem of the bandwidth resources that can't guarantee under the same ONU the shared ONU of distributing to fair between the different user that exist in the prior art; The invention provides a kind of gigabit passive optical network bandwidth management method, may further comprise the steps based on the ONU port:
The fixed-bandwidth that A10, ONU distribute OLT according to the priority of difference service, distributes enough bandwidth from high to low successively, and creates corresponding bandwidth resource pool B
n
A20, ONU on different uni ports, pass through from bandwidth resources pond B according to the current state of this port to same service
nThe middle mode that reclaims or borrow or lend money bandwidth resources is carried out the secondary distribution of bandwidth.
In said method, steps A 20 may further comprise the steps:
A201, ONU are that each UNI mouth distributes respective service S
nInitial bandwidth BI
NmWith initial credit degree CI
Nm, set credit rating C simultaneously
NmThe increase and decrease rule;
A202, each UNI mouth of ONU real-time statistics are served S in current period T
nAverage discharge BA
Nm, according to this average discharge BA
NmWhether greater than initial bandwidth BI
NmObtain the present load state of this UNI mouth, according to the current state and the credit rating C of this uni port
NmThe increase and decrease rule is carried out bandwidth adjustment, said credit rating C
NmThe increase and decrease rule is:
When the UNI mouth is zero to carry or during link down, reclaim all bandwidth resources of this UNI mouth and add corresponding bandwidth resource pool B to
nIn, increase the credit rating C of this UNI mouth simultaneously
Nm
When this UNI mouth is underloading, reclaims the untapped bandwidth resources of this underloading UNI mouth and add corresponding bandwidth resource pool B to
nIn, increase the credit rating C of this UNI mouth simultaneously
Nm
When this UNI mouth is heavy duty, the B from the bandwidth resources pond
nMiddle debt-credit bandwidth increases the bandwidth of this port, and the credit rating that reduces this UNI mouth simultaneously is C
Nm
In said method, when the UNI mouth was heavy duty, ONU at first judged whether to exist the heavy duty simultaneously of a plurality of UNI mouths, if salty year an of UNI only arranged, then judges the credit rating C of this UNI mouth
NmWhether＞0, if C
Nm＞0 bandwidth borrowed or lent money to this UNI mouth, and reduce the credit rating of this UNI mouth; Otherwise, this UNI port band width is not done any adjustment; When existing a plurality of UNI mouths all heavily loaded, ONU is according to the initial priority PU of each UNI mouth
NmWith the lendable bandwidth in the bandwidth resources pond, with priority P U
NmBe preface B successively from the bandwidth resources pond
nMiddle debt-credit bandwidth is given each heavily loaded UNI mouth.
In said method, it is B that ONU sets the bandwidth adjusted value, reclaims or is that unit carries out with a bandwidth adjusted value B during debt-credit bandwidth, and the credit rating of UNI mouth increases or reduces B simultaneously, and bandwidth adjusted value B is unit with KB.
In said method, when the UNI mouth is underloading, if BA '
Nm-BA
Nm＜B does not then reclaim the bandwidth of ONU, wherein BA '
NmBe the average discharge in the period T on this UNI mouth.
In said method, in the steps A 201, service S
nInitial credit degree CI
Nm=k * BI
Nm, k=1～5 wherein.
In said method, the span of T is 1s～600s, and the span of B is 64KB～512KB.
The present invention; Through being the different fixing bandwidth resources of service assignment; And the bandwidth that in same service, will distribute to ONU underloading UNI mouth reclaims; And deposit ONU bandwidth resources pond in, then the bandwidth of resource pool is borrowed or lent money to heavily loaded UNI mouth again, thereby realize between the different UNI mouths of ONU the bandwidth resources of fair shared ONU more.
Description of drawings
Fig. 1 is basic GPON system block diagram;
Fig. 2 is a T-CONT Bandwidth Management model in the GPON system;
Fig. 3 is the structure chart of ONU port bandwidth management of the present invention;
Fig. 4 is the flow chart of bandwidth management method that the present invention is based on the gigabit passive optical network of port.
Embodiment
Below in conjunction with accompanying drawing the present invention is made detailed explanation.
The bandwidth management method of the gigabit passive optical network based on port provided by the invention, in the OLT side, OLT accepts the bandwidth allocation request that ONU reports, and is that ONU distributes fixing bandwidth.In the ONU side, ONU carries out secondary management to the bandwidth of being distributed.At first, ONU is according to the initial priority PU of difference service
NmFor respective services is distributed the corresponding bandwidth resource; Be to be earlier the enough bandwidth of service assignment of high priority the fixed-bandwidth that distributes of ONU promptly from OLT; And then during remaining bandwidth distributed to successively, the service of low priority; After the allocated bandwidth of accomplishing each service,, do not borrow or lend money bandwidth mutually between each service even the bandwidth of a certain service in use is not enough yet; Secondly, ONU further to same service in the enterprising uplink bandwidth management of different port, through the port bandwidth management, the bandwidth of UNI mouth is managed once more, this way to manage is based on the same priority service.
In conjunction with Fig. 3, Fig. 4, the bandwidth management method of the gigabit passive optical network based on port provided by the invention may further comprise the steps:
A10, OLT serve S according to difference
n(wherein n representes type service, n=1, and 2 ...) priority P S
nBe each service S
nDistribute corresponding fixed-bandwidth BS
n, n is big more, and priority is high more, so service S
1, S
2..., S
nPriority increase successively, OLT at first guarantees to serve S when distributing bandwidth
nBandwidth demand, secondly be S
N-1, be S at last
2, S
1
A20, ONU to same service in the sub-distribution again of the enterprising uplink bandwidth of different uni ports.
Steps A 20 comprises following concrete steps:
A201, ONU are different service S
nCreate corresponding bandwidth resource pool B
n, and be that each UNI mouth distributes respective service S
nInitial bandwidth BI
NmWith initial credit degree CI
Nm, set credit rating C simultaneously
NmThe increase and decrease rule, wherein m representes the uni port sequence number of ONU, initial credit degree CI
Nm=k * BI
Nm, k=1～5, credit rating C
NmThe increase and decrease rule be, when the UNI mouth to bandwidth resources pond B
nIn when depositing the 1KB bandwidth, credit rating C
NmAdd 1; When certain UNI mouth is borrowed or lent money the bandwidth of 1KB from the bandwidth resources pond, credit rating C
NmSubtract 1; As credit rating C
Nm=0 o'clock, the UNI mouth can not continue to borrow or lend money bandwidth; So debt-credit bandwidth B B of UNI mouth
NmSatisfy :-BI
Nm≤BB
Nm≤k * BI
Nm,-BI
NmBandwidth is lent in expression.Initial bandwidth BI
NmWith initial priority PU
NmCorresponding, initial bandwidth BI
NmBig more, port priority PU
NmHigh more; Otherwise, the priority P U of this port then
NmMore little;
In the above-mentioned steps, in order to raise the efficiency, it is B that ONU sets the bandwidth adjusted value, reclaims or is that unit carries out with a bandwidth adjusted value B during debt-credit bandwidth, and the credit rating of UNI mouth increases or reduces B simultaneously, and the bandwidth adjusted value is that B is unit with KB, and promptly B is several KB.
The flow information of A202, each UNI mouth of ONU real-time statistics, and this information deposited in the port flow information table, so that judge the port status of the UNI mouth of ONU.Specifically, at first calculate the UNI mouth and in current period T, serve S
nAverage discharge BA
NmAnd deposit in the port flow information table, then with this average discharge BA
NmInitial bandwidth BI with this UNI mouth
NmCompare, according to comparative result judge the state of this UNI mouth be zero carry, underloading or heavy duty, the uplink bandwidth of going forward side by side adjustment.
If BA
Nm=0, represent that then UNI mouth state is zero year or link down, ONU reclaims the bandwidth of this port and adds it bandwidth resources pond B of respective service to according to bandwidth adjusted value B
nIn, the credit rating that increases this UNI mouth simultaneously is C
Nm+ B;
If BA
Nm＜BInm representes that then UNI mouth state is a underloading, judges BA ' this moment
Nm-BA
NmValue (BA '
NmThe average discharge of representing this port in the period T), if BA '
Nm-BA
Nm＜B does not then reclaim the bandwidth of ONU; Otherwise, ONU reclaim according to bandwidth adjusted value B the corresponding port a B bandwidth and add the bandwidth resources pond B of respective service to
nIn, the credit rating that increases this UNI mouth simultaneously is C
Nm+ B;
If BA
Nm>=BI
Nm, represent that then UNI mouth state is heavy duty, judges BA ' this moment
Nm-BA
NmValue, if BA
Nm-BA '
Nm＜B, then ONU does not does not borrow or lend money bandwidth; Otherwise ONU passes through from service S
nBandwidth resources pond B
nIn the debt-credit bandwidth B increase the bandwidth of this port, and the credit rating that reduces this UNI mouth is C
Nm-B;
When heavily loaded UNI mouth to bandwidth resources pond B
nDuring the debt-credit bandwidth, following two kinds of situation are handled respectively:
(1), when a UNI only being arranged in the time of salty year, if resource pool B
nIn have bandwidth can borrow and the credit rating C of UNI mouth
Nm＞0, then bandwidth is borrowed or lent money to this UNI mouth, and debt-credit bandwidth B B
Nm=B; Otherwise, this UNI mouth is not done any adjustment;
(2), when there being a plurality of UNI mouths whens heavy duty all, ONU is then according to the initial priority PU of UNI mouth
Nm, preferentially satisfy the bandwidth demand of the heavily loaded UNI mouth of high priority, the concrete distribution with described in (1).
Among the present invention, the span of T is 1s～600s, and the span of B is 64KB～512KB, and the present invention can accomplish to make full use of cpu resource and limited bandwidth resources through the reasonable value of T and B, has improved bandwidth availability ratio, guarantees quality of services for users.
Bandwidth management method according to the invention is divided into two levels and realizes.At first set up the model of allocated bandwidth, this model mainly is based on the bandwidth debt-credit of priority and credit rating; Realize professional mapping then, different service is mapped to different priority, this mapping relations can decide according to real business demand.The implementation method of this layering, guaranteed the present invention not only more efficient use the limited bandwidth resources of ONU, and also more flexible in practical application, use more extensive.
Following examples are a kind of concrete application of the present invention, among this embodiment, VOIP business, IPTV and three kinds of business of broadband access network are arranged, and ONU has four UNI mouths.According to said method, the concrete service in conjunction with FTTH type ONU provides is decided to be high-priority service with the VOIP business; Next is IPTV and broadband access network; So VOIP is mapped to service priority 3, IPTV is mapped to service priority 2, and broadband access network is mapped to service priority 1.
For above-mentioned three kinds of services, have the FTTH type ONU of 4 UNI mouths, for the bandwidth that satisfies UNI mouth demand is respectively: VOIP 64K, IPTV 3M, broadband access network 2M, the bandwidth resources that then need consume are 4 * (64K+3M+2M).
When the bandwidth of distributing to ONU as OLT only has 15M; If do not adopt bandwidth management method provided by the present invention, just can not satisfy all users' demand, and when a UNI mouth state is link down; But this UNI mouth is still taking its bandwidth resources; Must cause waste of bandwidth this moment, causes bandwidth availability ratio not high, adopts the present invention then can improve the utilization ratio of bandwidth greatly.
According to the present invention, can draw following constraints,
PS
n＝n，n＝1，2，3；
BI
1m＝2M，m＝1，2，3，4；
CI
1m＝2×2×1024＝4096，m＝1，2，3，4；
BS
1+BS
2+BS
3＝15M；
BI
11+BI
12+BI
13＝2.75M；
-BI
1m≤BB
1m≤2BI
1m，m＝1，2，3，4；
According to above-mentioned constraints, combine the performance statistics of ONU to verify again, draw to draw a conclusion: if average discharge computing cycle T is oversize, CPU usage can be lower, but bandwidth availability ratio is very low, and real-time response is untimely; If time T is too short, CPU usage is very big, and bandwidth availability ratio also can be very low simultaneously, even can influence professional operate as normal.The present invention can satisfy different application scenes according to different demands setting-up time T flexibly.Through suitable T and B are set, can make full use of cpu resource and limited bandwidth resources, improved bandwidth availability ratio, guarantee quality of services for users.
The present invention provides a kind of bandwidth management method based on port for the ONU equipment of GPON system, thereby ensures for GPON provides better QoS.Through bandwidth management method of the present invention; The GPON system not only provides outstanding QoS service ability through perfect DBA between OLT and ONU; And in the inner secondary allocation management that realizes bandwidth of ONU; Better guaranteed the QoS service, thereby the bandwidth of can be the more fair shared ONU of user has solved the fairness problem of user's utilized bandwidth resource of same ONU different port.
The present invention is not limited to above-mentioned preferred forms, and anyone should learn the structural change of under enlightenment of the present invention, making, and every have identical or close technical scheme with the present invention, all falls within protection scope of the present invention.
Claims (6)
1. based on the gigabit passive optical network bandwidth management method of ONU port, it is characterized in that may further comprise the steps:
The fixed-bandwidth that A10, ONU distribute OLT according to the priority of difference service, distributes enough bandwidth from high to low successively, and creates corresponding bandwidth resource pool B
n
A20, ONU on different uni ports, pass through from bandwidth resources pond B according to the current state of this port to same service
nThe middle mode that reclaims or borrow or lend money bandwidth resources is carried out the secondary distribution of bandwidth;
Steps A 20 may further comprise the steps:
A201, ONU are that each UNI mouth distributes respective service S
nInitial bandwidth BI
NmWith initial credit degree CI
Nm, set credit rating C simultaneously
NmThe increase and decrease rule;
A202, each UNI mouth of ONU real-time statistics are served S in current period T
nAverage discharge BA
Nm, according to this average discharge BA
NmWhether greater than initial bandwidth BI
NmObtain the present load state of this UNI mouth, according to the current state and the credit rating C of this uni port
NmThe increase and decrease rule is carried out bandwidth adjustment, said credit rating C
NmThe increase and decrease rule is:
When the UNI mouth is zero to carry or during link down, reclaim all bandwidth resources of this UNI mouth and add corresponding bandwidth resource pool B to
nIn, increase the credit rating C of this UNI mouth simultaneously
Nm
When this UNI mouth is underloading, reclaims the untapped bandwidth resources of this underloading UNI mouth and add corresponding bandwidth resource pool B to
nIn, increase the credit rating C of this UNI mouth simultaneously
Nm
When this UNI mouth is heavy duty, the B from the bandwidth resources pond
nMiddle debt-credit bandwidth increases the bandwidth of this port, reduces the credit rating C of this UNI mouth simultaneously
Nm
2. the gigabit passive optical network bandwidth management method based on the ONU port as claimed in claim 1; It is characterized in that when the UNI mouth is heavy duty; ONU at first judges whether to exist the heavy duty simultaneously of a plurality of UNI mouths, if salty year an of UNI only arranged, then judges the credit rating C of this UNI mouth
NmWhether＞0, if C
Nm＞0 bandwidth borrowed or lent money to this UNI mouth, and reduce the credit rating of this UNI mouth; Otherwise, this UNI port band width is not done any adjustment; When existing a plurality of UNI mouths all heavily loaded, ONU is according to the initial priority PU of each UNI mouth
NmWith the lendable bandwidth in the bandwidth resources pond, with priority P U
NmBe preface B successively from the bandwidth resources pond
nMiddle debt-credit bandwidth is given each heavily loaded UNI mouth.
3. according to claim 1 or claim 2 gigabit passive optical network bandwidth management method based on the ONU port; It is characterized in that; It is B that ONU sets the bandwidth adjusted value; Reclaim or be that unit carries out with a bandwidth adjusted value B during debt-credit bandwidth, the credit rating of UNI mouth increases or reduces B simultaneously, and bandwidth adjusted value B is unit with KB.
4. the gigabit passive optical network bandwidth management method based on the ONU port as claimed in claim 1 is characterized in that, when the UNI mouth is underloading, if BA '
Nm-BA
Nm＜B does not then reclaim the bandwidth of UNI, wherein BA '
NmBe the average discharge in the period T on this UNI mouth.
5. the gigabit passive optical network bandwidth management method based on the ONU port as claimed in claim 1 is characterized in that, in the steps A 201, and service S
nInitial credit degree CI
Nm=k * BI
Nm, k=1～5 wherein.
6. the gigabit passive optical network bandwidth management method based on the ONU port as claimed in claim 3 is characterized in that the span of T is 1s～600s, and the span of B is 64KB～512KB.
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| US9455794B2 (en) | 2012-10-29 | 2016-09-27 | Qualcomm Incorporated | Device registration and sounding in a time-division multiple access network |
| US20150270986A1 (en) * | 2012-10-29 | 2015-09-24 | Na Wang | Credit-based dynamic bandwidth allocation for time-division multiple access communications |
| CN102984073B (en) * | 2012-11-29 | 2016-12-07 | 上海快应信息科技有限公司 | Resource management apparatus in a kind of multicast service and method |
| CN104053077B (en) * | 2014-06-23 | 2017-06-30 | 重庆邮电大学 | One kind is based on the modular EPON power-economizing methods of ONU |
| CN105530201B (en) * | 2014-09-29 | 2019-05-31 | 深圳市中兴微电子技术有限公司 | A kind of method, equipment and the system of uplink bandwidth in passive optical network distribution |
| CN110350974B (en) * | 2017-02-15 | 2020-09-11 | 金钱猫科技股份有限公司 | PON equipment automatic registration method for avoiding repeated allocation |
| CN112911421B (en) * | 2019-12-04 | 2023-03-28 | 中国电信股份有限公司 | Dynamic bandwidth allocation method and device, passive optical fiber network and storage medium |
| CN112491577B (en) * | 2020-10-10 | 2023-12-05 | 北京思特奇信息技术股份有限公司 | Bandwidth acceleration method and system |
| CN113316036B (en) * | 2020-11-05 | 2022-08-05 | 北京邮电大学 | Dynamic wavelength bandwidth allocation method |
| CN113905018B (en) * | 2021-09-14 | 2022-09-06 | 广东云下汇金科技有限公司 | Resource management method and device applied to data center bandwidth outlet |
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