CN103441958A - Dynamic remote passive optical network bandwidth allocation method - Google Patents
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Abstract
The invention provides a dynamic remote passive optical network bandwidth allocation method which is achieved by means of real-time dynamic polling. The allocation method comprises the steps that (1) a system is initialized, (2) ONUs are prioritized by an OLT according to QoS, (3) the ONUs send bandwidth application information to the OLT, and (4) bandwidth allocation is carried out on the ONUs by the OLT by means of real-time dynamic polling. According to the dynamic remote passive optical network bandwidth allocation method, by means of real-time polling, dynamic uplink bandwidth allocation is carried out on the ONUs by the OLT, a communication bandwidth with a high QoS priority can be obtained, and time delay of polling is reduced.
Description
Technical field
The present invention relates to a kind of method of EPON communication technical field, specifically relate to the method for a kind of long distance passive optical-fiber network (LR-PON) communication medium and long distance without the real time polling Bandwidth Dynamic Allocation of communication.
Background technology
Long-distance passive optical network (LR-PON) proposes one and has more cost-benefit broadband optical access solution compared to conventional P ON, LR-PON utilize fiber amplifier and wavelength-division multiplex technique by 20 kilometers traditional coverage extension to 100 kilometers.General LR-PON framework is by the CO of expansion sharing fiber connection and local user's exchange, the fiber that the user who then is connected with optical branching device by CO is shared.Compare traditional PON, LR-PON has merged the role of optical line terminal (OLT) and central office (CO), thereby has greatly reduced corresponding operation expenditure.Generally, LR-PON can simplified network, reduces the interface of some equipment, network element, even node.
Pass through over distance link transmission upstream data by optical line terminal (OLT) and optical network unit (ONU).The maximum transmitted scope of traditional passive fiber optic network (PON) standard is 20 kilometers, and the transmission range of LR-PON is 100 kilometers.In addition, the line speed of LR-PON is R=10Gb/s, and 2000 to 4000 ONU of each OLT management.Conventional dynamic allocated bandwidth (DBA) method needs bandwidth information (REPORT) that optical network unit (ONU) at first uploads needs to OLT, and then OLT returns to ONU equipment GATE information, authorizes corresponding bandwidth.This method makes the time delay t of transmission
d>=RTT
maxand the round trip delay time (RTT) of long-distance passive optical network (LR-PON) is longer than conventional P ON network; therefore traditional DBA method can not meet the communication requirement of remote PON network; these characteristics have determined that LR-PON needs more complicated and efficient allocated bandwidth dispatching method than conventional PON; especially the high ONU for service priority; as the relaying protection side, the QoS of its communication has very important meaning.
Summary of the invention
For overcoming above-mentioned the deficiencies in the prior art, the invention provides a kind of real time polling Bandwidth Dynamic Allocation method of long distance passive optical network communication; The method is by real-time polling mode, in the OLT side, the upstream bandwidth of ONU carried out to dynamic assignment, and the communication bandwidth that at first guaranteed qos priority is higher can be met, and reduces the time delay of poll.
Realize that the solution that above-mentioned purpose adopts is:
A kind of long distance passive optical network band width dynamic allocation method, its improvements are: described method adopts the method for real-time dynamic polling, and described distribution method comprises the following steps:
I, system initialization;
II, OLT divide ONU priority according to QoS;
III, ONU send the bandwidth application information to OLT;
IV, OLT are used real-time dynamic state polling method to distribute bandwidth to ONU.
Further, described Step II comprises:
The ONU communication priority situation that step 1), OLT statistics connect;
Step 2), obtain the ONU set N that the QoS demand is high
qoS, the common ONU of QoS demand set N
normal, the uplink time window W of uniform distribution ONU
max, determine that distributing the polling sequence of ONU is { N
qoS, N
normal.
Further, described Step II I comprises:
Step 1), OLT are according to the initial uplink time window W of ONU
maxsummation, obtain current time T
currentin=0 situation, OLT distributes the needed time delay T of bandwidth next time
next-grant=N * W
max; Wherein N means the ONU number of registering in network;
Step 2), to set the initial bandwidth of each ONU be 0b/s, the maximum bandwidth that OLT can pass through is B
max, current spendable bandwidth is B, B ∈ [0, B
max];
The needed delay time of sub-distribution bandwidth under step 3), contrast current time and OLT;
Step 4), OLT judge whether ONU belongs to the ONU that the QoS demand is high, the ONU that priority allocation QoS demand is high.
Further, described step 3) comprises: judgement T
current=T
next-grantwhether set up, set up optical network unit ONU
isend bandwidth information to OLT, OLT calculates and obtains optical network unit ONU
ineed the bandwidth GRANT distributed
request, otherwise wait for T
currentincrease, until T
current=T
next-grant.
Further, described step 4) comprises: OLT judges whether ONU belongs to the ONU that the QoS demand is high;
If distribute bandwidth GRANT
igive optical network unit ONU
i, distribute bandwidth GRANT
i=min (GRANT
request, B), and calculate the spendable bandwidth B=B-GRANT of residue
i;
Otherwise bandwidth demand GRANT
i=min (G
threshold, GRANT
request); Wherein, G
thresholdfor current available bandwidth divided by remaining not poll ONU quantity, but B is utilized bandwidth.
Further, the size of described OLT to its upstream traffic of ONU real time polling, and, according to the result of poll, carry out the Bandwidth Dynamic Allocation of ONU.
Further, described method is classified according to the QoS demand of ONU, in assurance, meets on the basis of the ONU communication bandwidth that the QoS demand is high, according to the order of poll, distributes one by one remaining bandwidth.
Further, take tradition, determine to distribute the sequencing of bandwidth the time of advent be basis to described method, the ONU bandwidth that priority allocation priority is high, the ONU bandwidth that rear distribution priority is common.
Compared with prior art, the present invention has following beneficial effect:
(1) method of the present invention has been abandoned the bandwidth application method of traditional fixedly poll periodic mode, based on real time polling, make OLT can distribute in real time the optical network unit bandwidth, and do not need after the complete all ONU of poll to reallocate, reduced propagation delay time, improved operating efficiency.
(2) method of the present invention is classified to the telecommunication service quality of optical network unit, preferentially meets the bandwidth demand of the optical network unit that QoS is high, reduces transmission delay, increases work efficiency.
(3) method of the present invention is for the communication that the telecommunication service quality demand is arranged, optical line terminal is distributing the communication requirement that can meet optical network unit on bandwidth, and the general communication to the telecommunication service quality demand, optical line terminal is distributed according to the order of poll, the As soon as possible Promising Policy bandwidth demand.
(4) uplink bandwidth allocation method that the present invention adopts can take full advantage of bandwidth resources, optimized the allocated bandwidth of long distance P ON communication, for the RTT time of long distance P ON is long, ONU that cause waits for the problem that the bandwidth authorizing time is long, has adopted the method for the ONU that priority allocation QoS demand is high.
(5) distribution method of dynamic bandwidth provided by the invention has been made the difference management to ONU, has improved management effect, makes the bandwidth of Access Network and the importance coupling of ONU business, is applicable to the comparatively fixing application scenario of business-level.
The accompanying drawing explanation
The flow chart of the real time polling Bandwidth Dynamic Allocation method that Fig. 1 is the long distance passive optical network communication;
Fig. 2 is ONU
iand ONU
jsend successively REPORT message according to polling sequence and enter the OLT schematic diagram;
Fig. 3 is that long distance passive optical network band width dynamic allocation procedure produces the bandwidth request schematic diagram;
Fig. 4 is long distance passive optical network band width dynamic allocation procedure transmission bandwidth request schematic diagram;
Fig. 5 is that long distance passive optical network band width dynamic allocation procedure returns to the bandwidth authorizing schematic diagram according to priority orders.
Embodiment
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is described in further detail.
The flow chart of the real time polling Bandwidth Dynamic Allocation method that as shown in Figure 1, Fig. 1 is the long distance passive optical network communication;
A kind of long distance passive optical network band width dynamic allocation method that adopts real-time dynamic polling, the size of described optical line terminal (OLT) to its upstream traffic of optical network unit (ONU) real time polling, and, according to the result of poll, carry out the Bandwidth Dynamic Allocation of each optical network unit.OLT is classified to ONU according to the QoS demand, in assurance, meets on the basis of the ONU communication bandwidth that the QoS demand is high, according to the order of poll, distributes one by one remaining bandwidth.
A kind of long distance passive optical network band width dynamic allocation method of real-time dynamic polling that adopts specifically comprises the following steps:
Step 1, system initialization, optical line terminal is according to QoS(service quality) the divided light network element; Comprise following:
The optical network unit communication priority situation that step 1), optical line terminal statistics connect;
Step 2), obtain the high optical network unit set N of QoS demand
qoS, the common optical network unit set N of QoS demand
normal, the uplink time window W of uniform distribution optical network unit
max, determine that distributing the polling sequence of optical network unit is { N
qoS, N
normal; Wherein, N
qoSmean the ONU set that the QoS demand is high, N
normalmean the ONU set that the QoS demand is common.
Step 2, optical network unit send the bandwidth application information to optical line terminal; Comprise following:
Step 1), optical line terminal are according to the initial uplink time window W of optical network unit
maxsummation, obtain current time T
currentin=0 situation, optical line terminal distributes the needed time delay T of bandwidth next time
next-grant=N * W
max; Wherein, T
next-grantmean that optical line terminal distributes the needed time delay of bandwidth next time, the ONU number that N has meaned in network to register, W
maxthe initial uplink time window that means optical network unit.
Step 2), to set the initial bandwidth of each optical network unit be 0b/s, the maximum bandwidth that optical line terminal can pass through is B
max, current spendable bandwidth is B, B ∈ [0, B
max];
The needed delay time of sub-distribution bandwidth under step 3), contrast current time and optical line terminal;
Judgement T
current=T
next-grantwhether set up, set up optical network unit ONU i and send REPORT information to optical line terminal, optical line terminal calculates this optical network unit immediately need to distribute bandwidth GRANT
request.
If be false, ONU continues to wait for T
currentincrease, until T
current=T
next-grant.
Step 4), optical line terminal judge whether optical network unit belongs to the optical network unit that the QoS demand is high, the optical network unit that priority allocation QoS demand is high;
Optical line terminal judges whether optical network unit belongs to the optical network unit that the QoS demand is high; If distribute bandwidth GRANT
igive optical network unit ONU
i, distribute bandwidth GRANT
i=min (GRANT
request, B), and calculate left spendable bandwidth B=B-GRANT
i; Otherwise bandwidth demand GRANT
i=min (G
threshold, GRANT
request), G wherein
threshold=B/ (N-i), current available bandwidth is divided by remaining not poll optical network unit quantity; GRANT
requestmean that optical network unit need to distribute bandwidth, B is current spendable bandwidth.
Step 3, optical line terminal are used real-time dynamic state polling method to distribute bandwidth to optical network unit.
As shown in Figure 2, Fig. 2 is ONU
iand ONU
jsend successively REPORT message according to polling sequence and enter the OLT schematic diagram; , ONU
iand ONU
jsend successively bandwidth messages according to polling sequence and enter optical line terminal, optical line terminal is processed this demand immediately, has reduced the wait time delay.
As shown in Fig. 3,4,5, Fig. 3,4,5 is respectively long distance passive optical network band width dynamic allocation procedure and produces bandwidth request, transmission bandwidth request and return to the bandwidth authorizing schematic diagram according to priority orders;
ONU1, ONU2, ONU3 connect OLT, the ONU communication priority situation that the OLT statistics connects; Obtain the ONU set N that the QoS demand is high
qoS={ ONU1}, the common ONU set N of QoS demand
normal={ ONU2, ONU3}N
normal, the uplink time window W of uniform distribution optical network unit
max, determine that distributing the polling sequence of ONU is { N
qoS, N
normal.
ONU1, ONU2, ONU3 produce the bandwidth application information to OLT, as shown in Figure 3; Transmission bandwidth request is to OLT, as shown in Figure 4.OLT is used real-time dynamic state polling method to distribute successively the bandwidth of ONU1, ONU2, ONU3 according to the priority situation.As shown in Figure 5.
Finally should be noted that: above embodiment is only for technical scheme that the application is described but not to the restriction of its protection range; although with reference to above-described embodiment, the application is had been described in detail; those of ordinary skill in the field are to be understood that: those skilled in the art still can carry out all changes, revise or be equal to replacement to the embodiment of application after reading the application; but these changes, revise or be equal to replacement, within the claim protection range all awaited the reply in application.
Claims (8)
1. a long distance passive optical network band width dynamic allocation method, it is characterized in that: described method adopts the method for real-time dynamic polling, and described distribution method comprises the following steps:
I, system initialization;
II, OLT divide ONU priority according to QoS;
III, ONU send the bandwidth application information to OLT;
IV, OLT are used real-time dynamic state polling method to distribute bandwidth to ONU.
2. a kind of long distance passive optical network band width dynamic allocation method as claimed in claim 1, it is characterized in that: described Step II comprises:
The ONU communication priority situation that step 1), OLT statistics connect;
Step 2), obtain the ONU set N that the QoS demand is high
qoS, the common ONU of QoS demand set N
normal, the uplink time window W of uniform distribution ONU
max, determine that distributing the polling sequence of ONU is { N
qoS, N
normal.
3. a kind of long distance passive optical network band width dynamic allocation method as claimed in claim 1, it is characterized in that: described Step II I comprises:
Step 1), OLT are according to the initial uplink time window W of ONU
maxsummation, obtain current time T
currentin=0 situation, OLT distributes the needed time delay T of bandwidth next time
next-grant=N * W
max; Wherein N means the ONU number of registering in network;
Step 2), to set the initial bandwidth of each ONU be 0b/s, the maximum bandwidth that OLT can pass through is B
max, current spendable bandwidth is B, B ∈ [0, B
max];
The needed delay time of sub-distribution bandwidth under step 3), contrast current time and OLT;
Step 4), OLT judge whether ONU belongs to the ONU that the QoS demand is high, the ONU that priority allocation QoS demand is high.
4. a kind of long distance passive optical network band width dynamic allocation method as claimed in claim 3, it is characterized in that: described step 3) comprises: judgement T
current=T
next-grantwhether set up, set up optical network unit ONU i and send bandwidth information to OLT, OLT calculates and obtains the bandwidth GRANT that optical network unit ONU i need to distribute
request, otherwise wait for T
currentincrease, until T
current=T
next-grant.
5. a kind of long distance passive optical network band width dynamic allocation method as claimed in claim 3, it is characterized in that: described step 4) comprises: OLT judges whether ONU belongs to the ONU that the QoS demand is high;
If distribute bandwidth GRANT
igive optical network unit ONU
i, distribute bandwidth GRANT
i=min (GRANT
request, B), and calculate the spendable bandwidth B=B-GRANT of residue
i;
Otherwise bandwidth demand GRANT
i=min (G
threshold, GRANT
request); Wherein, G
thresholdfor current available bandwidth divided by remaining not poll ONU quantity, but B is utilized bandwidth.
6. a kind of long distance passive optical network band width dynamic allocation method as claimed in claim 1 is characterized in that: the size of described OLT to its upstream traffic of ONU real time polling, and, according to the result of poll, carry out the Bandwidth Dynamic Allocation of ONU.
7. a kind of long distance passive optical network band width dynamic allocation method as claimed in claim 1, it is characterized in that: described method is classified according to the QoS demand of ONU, meet on the basis of the ONU communication bandwidth that the QoS demand is high in assurance, according to the order of poll, distribute one by one remaining bandwidth.
8. a kind of long distance passive optical network band width dynamic allocation method as claimed in claim 1, it is characterized in that: take tradition, determine to distribute the sequencing of bandwidth the time of advent be basis to described method, the ONU bandwidth that priority allocation priority is high, the ONU bandwidth that rear distribution priority is common.
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Cited By (10)
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| CN105721350A (en) * | 2016-03-04 | 2016-06-29 | 深圳市共进电子股份有限公司 | Intelligent bandwidth allocation method and apparatus |
| CN106792284A (en) * | 2016-12-23 | 2017-05-31 | 重庆邮电大学 | A kind of low energy consumption network design method chosen with adaptive gateway |
| CN107770091A (en) * | 2017-09-15 | 2018-03-06 | 北京国电通网络技术有限公司 | Power optical fiber is to family bandwidth allocation methods and device |
| CN108134967A (en) * | 2017-11-27 | 2018-06-08 | 全球能源互联网研究院有限公司 | A kind of electric power optical-fiber network routing frequency spectrum distributing method and system |
| CN109286580A (en) * | 2017-07-21 | 2019-01-29 | 中兴通讯股份有限公司 | A kind of passive optic network up bandwidth distribution method and device |
| CN109495797A (en) * | 2017-09-13 | 2019-03-19 | 中兴通讯股份有限公司 | Management method, OLT and the system of ONU in a kind of passive optical network |
| CN109728927A (en) * | 2017-10-30 | 2019-05-07 | 中兴通讯股份有限公司 | Time delay optimization method, business scheduling method and storage medium |
| CN110932769A (en) * | 2019-11-12 | 2020-03-27 | 南京衡尔姮网络科技有限公司 | Multichannel satellite bandwidth dynamic allocation method |
| CN115175024A (en) * | 2022-06-01 | 2022-10-11 | 苏州大学 | Passive optical network bandwidth resource scheduling method and system for mobile transmission |
| WO2023246598A1 (en) * | 2022-06-22 | 2023-12-28 | 中兴通讯股份有限公司 | Bandwidth allocation method, optical communication system, device, and storage medium |
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Cited By (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105721350A (en) * | 2016-03-04 | 2016-06-29 | 深圳市共进电子股份有限公司 | Intelligent bandwidth allocation method and apparatus |
| CN106792284A (en) * | 2016-12-23 | 2017-05-31 | 重庆邮电大学 | A kind of low energy consumption network design method chosen with adaptive gateway |
| CN106792284B (en) * | 2016-12-23 | 2019-12-13 | 重庆邮电大学 | Low-energy-consumption network design method with self-adaptive gateway selection |
| CN109286580B (en) * | 2017-07-21 | 2023-11-24 | 中兴通讯股份有限公司 | Uplink bandwidth allocation method and device for passive optical network |
| CN109286580A (en) * | 2017-07-21 | 2019-01-29 | 中兴通讯股份有限公司 | A kind of passive optic network up bandwidth distribution method and device |
| CN109495797B (en) * | 2017-09-13 | 2022-02-22 | 中兴通讯股份有限公司 | ONU management method, OLT and system in passive optical network |
| CN109495797A (en) * | 2017-09-13 | 2019-03-19 | 中兴通讯股份有限公司 | Management method, OLT and the system of ONU in a kind of passive optical network |
| CN107770091A (en) * | 2017-09-15 | 2018-03-06 | 北京国电通网络技术有限公司 | Power optical fiber is to family bandwidth allocation methods and device |
| CN107770091B (en) * | 2017-09-15 | 2020-08-04 | 北京国电通网络技术有限公司 | Power fiber-to-the-home bandwidth allocation method and device |
| CN109728927A (en) * | 2017-10-30 | 2019-05-07 | 中兴通讯股份有限公司 | Time delay optimization method, business scheduling method and storage medium |
| CN109728927B (en) * | 2017-10-30 | 2021-11-05 | 中兴通讯股份有限公司 | Time delay optimization method, service scheduling method and storage medium |
| CN108134967B (en) * | 2017-11-27 | 2022-06-07 | 全球能源互联网研究院有限公司 | Power optical network routing frequency spectrum distribution method and system |
| CN108134967A (en) * | 2017-11-27 | 2018-06-08 | 全球能源互联网研究院有限公司 | A kind of electric power optical-fiber network routing frequency spectrum distributing method and system |
| CN110932769A (en) * | 2019-11-12 | 2020-03-27 | 南京衡尔姮网络科技有限公司 | Multichannel satellite bandwidth dynamic allocation method |
| CN115175024A (en) * | 2022-06-01 | 2022-10-11 | 苏州大学 | Passive optical network bandwidth resource scheduling method and system for mobile transmission |
| WO2023246598A1 (en) * | 2022-06-22 | 2023-12-28 | 中兴通讯股份有限公司 | Bandwidth allocation method, optical communication system, device, and storage medium |
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