CN104901762A - Dynamic wavelength and bandwidth allocation method of minimum tuning in time- and wavelength-division multiplexed passive optical network - Google Patents
Dynamic wavelength and bandwidth allocation method of minimum tuning in time- and wavelength-division multiplexed passive optical network Download PDFInfo
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Abstract
The invention discloses a dynamic wavelength and bandwidth allocation method of minimum tuning in time- and wavelength-division multiplexed passive optical network (TWDM-PON), and belongs to the technical field of optical access networks. An optical line terminal (OLT) is used for grouping optical network units (ONUs) according to transmission wavelengths of the ONUs; before the polling cycle authorization begins, the OLT sorts the bandwidth requests of all ONUs in the group from big to small after collecting the bandwidth requests. The method comprises the following steps: firstly selecting a wavelength which is free first, and then preferentially allocating the wavelength to the ONU which performs transmission at the wavelength in the previous cycle, and allocating a transmission data window for the ONU. The wavelength tuning frequency of the ONU can be reduced through the adoption of a minimum of wavelength tuning scheme (MWT) algorithm; therefore, the time delay of the system is reduced, the energy consumption caused by the tuning process is lowered at the same time, and the method better conforms to the environment-protecting concept.
Description
Technical field
The present invention relates to the Dynamic Wavelength Assignment Algorithms in a kind of time-division wavelength division multiplexing stack Optical Access Network, belong to Technology of Light Access Network field.
Background technology
Demand for user's access band constantly increases, the Technology of Light Access Network of traditional gigabit level such as GEPON and GPON etc. can not meet the demand of user, therefore industry starts research and the standardization effort of rear 10Gbit/s PON technology, and a mainstream technology scheme wherein towards 40Gbit/s PON is exactly TWDM-PON (Time-and Wavelength-Division Multiplexed Passive Optical Network).In April, 2012, TWDM-PON was chosen to be unique developing direction of NG-PON2 by International Standards Organization FSAN.NG-PON2 selects TWDM-PON as main technical schemes, main demand be exactly make full use of conventional P ON technology period aspect long-term technology accumulation and ripe XG-PON chip protocol layer technology, it be a kind of on the basis of time division multiplexing PON (TDM-PON) by network that wave stack is formed.Its structure is followed from TDM-PON, and optical line terminal (Optical Line Terminal, OLT) is connected by optical branching device (Splitter) and all optical network units (Optical Network Unit, ONU).The Optical Distribution Network (Optical Distribution network, ODN) that TWDM-PON does not need change operator to lay, in agreement, GPON or XG-PON1 of closest widespread deployment, is the evolution of GPON and XG-PON1.TWDM-PON combines the advantage of time division passive optical network and wavelength-division EPON, is very suitable for disposing from time division passive optical network to the transition stage of wavelength-division EPON.
TWDM-PON system configuration utilizes wavelength division multiplexing, and by M (4,8 or more), 10G TDM-PON is stacking forms.In its logical construction, OLT carries out multiplexing and demultiplexing to multichannel wavelength channel simultaneously, ONU selects a concrete wavelength channel (receiving wavelength and transmission wavelength) to communicate with OLT by Dimmable transceiver, and that is synchronization, ONU can only receive, launch a wavelength.In a wavelength channel, the technology such as TWDM-PON reusable 10G-PON downlink time division multiplex technique, up time division multiple access access technology, time slot size, broadcast and allocated bandwidth.Its major advantage is good with the technology inheritance of existing 10G-PON, multiplexing efficiency and bandwidth availability ratio high.
Also belong to the starting stage for DWBA (the Dynamic Wavelength and Bandwidth Allocation) research in TWDM-PON at present, major part inherits TDM/WDM-PON.And to the dynamic wavelength of TWDM-PON and allocated bandwidth, mainly still concentrate on allocated bandwidth, compare less to the distribution research of wavelength.Therefore this patent relates generally to the dispatching algorithm of multi-wavelength in TWDM-PON, and its bandwidth allocation algorithm can have certain experience to draw on from existing PON bandwidth allocation algorithm research.At present, domestic and international researcher has proposed a lot of dynamic bandwidth allocation algorithm, such as IPACT (Interleaved Polling with Adaptive Cycle Time), JIT (Just In Time) etc.And for Wavelength Assignment, now main what propose is idle priority allocation principle the earliest, the emphasis of these algorithms be improve bandwidth utilance and reduce packet delay.But divide at multi-wavelength and mix, existing algorithm does not add the ONU wavelength tuning time.What the time switched between existing tunable laser medium wavelength was the slowest is from several seconds to a few microsecond, and the fastest is nanosecond.But fast tuned laser is very expensive, and energy resource consumption is large, is generally not used in Access Network at present.Therefore, the most normal tuning period to the laser of ONU outfit is at least tens microseconds.This must take into account in DBA algorithm.This patent take into account the ONU wavelength tuning time, and research breakthrough is carried out in the tuned frequency aspect being mainly devoted to reduce ONU.
Summary of the invention
In order to reduce the tuned frequency of ONU medium wavelength, the present invention is directed to TWDM-PON and propose a kind of minimum tuning dynamic wavelength assignment method in time-division wavelength division multiplexing stack Optical Access Network, comprising the Wavelength assignment algorithm of minimum wavelength tuning mechanism (A Minimum of Wavelength Tuning Scheme, MWT).Although at present in TWDM-PON, prioritizing selection the earliest free wavelength carry out that the transmission of bandwidth used very extensive, it is comprehensive not that he still considers.Main thought of the present invention adopts MWT to carry out Wavelength Assignment, mainly the ONU carrying out transfer of data at same wavelength is divided into one group, when poll, while considering preferential idle wavelength, the ONU of prioritizing selection on this wavelength transmits, reduce the wavelength tuning frequency of ONU, be conducive to the time delay of reduction system like this, reduce the energy resource consumption that tuning process brings simultaneously, more meet environmental protection theory.
Suppose that the number of ONU in TWDM-POM system is N, the number of wavelength is M, and the transmission rate of network is R
n, maximum polling cycle is T
cycle, the protection between transmission window is spaced apart T
g.
The dynamic assignment of wavelength: MWT
In the olt, the corresponding variable of each wavelength channel
(m=1,2 ..., M), represent the next available transmission moment of wavelength channel m, OLT record is all
give each channel allocation array W [N] simultaneously, be used for the ONU subscript that this channel of memory carries out transmitting.When initialization, when OLT is ONU distribution wavelength channel, select current
minimum wavelength channel, authorize the transmission window of ONU on this wavelength channel simultaneously, then upgrades this wavelength channel
and ONU subscript is recorded in W [N], as the size of transmission window, is determined by bandwidth allocation algorithm.Then, when next poll, we carry out descending sequence, for current to the ONU request on channel
minimum wavelength channel, we select the ONU be recorded in this wavelength to carry out the transmission of data, that is the ONU of each wavelength chooses to be the last polling cycle of prioritizing selection carry out transmitting at this wavelength that.When the whole poll of ONU of certain wavelength is complete, and other wavelength also has remaining ONU, so just by the ONU wavelength tuning that do not transmit to the wavelength completed.Through like this, the wavelength conversion number of times of ONU just can be greatly reduced.Above Wavelength Assignment process is called " minimum wavelength tuning mechanism ".
In MWT, before a polling cycle mandate starts, the bandwidth request of all ONU that OLT will collect, has carried out the grouping of wavelength simultaneously to ONU.Then minimum wavelength tuning mechanism is adopted, allocated bandwidth is carried out to the ONU on the wavelength freed out the earliest, this prioritizing selection wavelength, select the rearranged form of ONU can reduce wavelength conversion between ONU again, reduce the time delay brought because of wavelength conversion, also can improve the utilance of bandwidth simultaneously, can prove with schematic diagram shown in Fig. 1.
After completing Wavelength assignment algorithm, the wavelength that ONU uses and bring into use the time to determine.As for allocated bandwidth, adopt remaining bandwidth allocation algorithm herein.When
time claim this ONU to be underloading ONU, otherwise be heavily loaded ONU.Remaining bandwidth is because of underloading ONU
and cause, the remaining bandwidth of system refers to the remaining bandwidth sum of all underloading ONU.Remaining bandwidth is distributed to all heavily loaded ONU in proportion, the fairness between each ONU can be ensured.
Above Dynamic Wavelength Assignment Algorithms and dynamic bandwidth allocation algorithm all belong to DWBA method, complete in the DWBA module of OLT.By adopting MWS DWBA, the resource utilization ratio in TWDM-PON is improved, and Time Delay of Systems reduces, and also assures that the fairness in system resource scheduling.
Accompanying drawing explanation
Fig. 1 is the algorithm schematic diagram in the embodiment of the present invention.
Fig. 2 is the algorithm flow chart in the embodiment of the present invention.
Embodiment
For making the object, technical solutions and advantages of the present invention clearly, below in conjunction with accompanying drawing 2, embodiment of the present invention is described further in detail.Wherein GATE and REPORT message is all the mac frame used in TWDM-PON message interaction protocol, GATE message is sent to an independent ONU's from OLT, for distributing the time slot of transmission for this ONU, transmission wavelength, transmission start time and transmission window length three numerical value represent; REPORT message be ONU for local situation (as cache occupation amount, being interpreted as the bandwidth on demand of ONU in the present invention) being passed to the feedback mechanism of OLT, distribute time slot intelligently for helping OLT.Embodiment is as follows:
(1) ONU sends REPORT message to OLT, reports current bandwidth demand.REPORT message controls client by the MAC of ONU and generates and be marked by timestamp in MAC control sublayer.
(2) after REPORT message arrives OLT, the MAC being sent to OLT is controlled the DWBA module of client by it, and in addition, OLT also will utilize the timestamp comprised in REPORT message to calculate the two-way time (RTT) that it arrives this ONU.
(3) the DWBA module in OLT calculates the uplink scheduling of all ONU with collision free.After DWBA algorithm is finished, OLT will authorize ONU, by the work of this ONU wavelength channel, transmission the time started and transmission length be packaged into GATE message and broadcast.Wherein the process of DWBA module execution algorithm is as follows:
A) OLT records all ONU wavelength used when a upper polling cycle, stores the REPORT message of all ONU, the ONU of same wavelength is divided into one group, and to the ONU in group according to the order sequence from big to small of its bandwidth on demand;
B) OLT checks
(m=1,2 ... M), compare the wavelength showing that wherein numerical value is minimum, and this Wavelength Assignment is given first ONU after the interior current sequence of the ONU group of this wavelength, its transmission time started is
wavelength Assignment terminates.
C) next according to remaining bandwidth distribution principle, be ONU allocation of transmission bandwidth, concrete implementation algorithm is not within this patent protection range.
D) OLT is according to G
iupgrade
If the ONU e) on certain wavelength is assigned, then the ONU on other wavelength can be tuned to this free wavelength carries out transfer of data, otherwise to perform b), until all ONU authorize complete;
(4) when ONU receives the GATE message that one and its MAC Address match, the authorization value utilized wherein is configured local adjustable transmitter capable, transmission time started and transmission length register.
(5) arrive when the transmission time, beginning is transmitted data by ONU under uncompetitive environment, and the ethernet frame number of transmission depends on the transmission window size be assigned with.
(6) ONU the transmission time slot be assigned with start send REPORT message to report once bandwidth demand, transmission data while repeat step (2).
The present embodiment carries out dynamic wavelength allocated bandwidth by MWT DWBA to TWDM-PON, reduces ONU wavelength tuning frequency, reduces Time Delay of Systems, improve the utilance of Internet resources.
The embodiment of the present invention can pass through software simulating, and corresponding software can be stored in the storage medium that can read, such as, in the hard disk of computer, CD or floppy disk.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (3)
1. a time-division wavelength division multiplexing stack Optical Access Network (Time-and Wavelength-Division Multiplexed Passive Optical Network, TWDM-PON) dynamic wavelength assignment (the Dynamic Wavelength and Bandwidth Allocation) method in, after it is characterized in that ONU (Optical Network Unit) initiates bandwidth request, the DWBA module of OLT (Optical Line Terminal) performs MWT (Minimum of Wavelength Tuning Scheme) algorithm, for each ONU distributes spendable wavelength channel and bandwidth, when transmission time arrives, ONU transmits data according to authorization value, the information interaction between completing user and network.
2. MWT algorithm according to claim 1, is characterized in that the wavelength transmitted by it ONU divides into groups by OLT, and before polling cycle mandate starts, OLT will collect the bandwidth request of all ONU, and is asked to sort from big to small in group.The first selected idle wavelength got off at first, then the priority allocation last cycle is at the ONU of this wavelength transmission, specifies its transmission data window, completes the distribution of wavelength.
3. according to claim 2, if the ONU on a wavelength all authorizes complete, then the ONU of other wavelength just can carry out wavelength tuning, by wavelength conversion on this free wavelength, then Wavelength Assignment is carried out to undelegated ONU, complete overall wavelength chooses like this.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510259966.1A CN104901762A (en) | 2015-05-20 | 2015-05-20 | Dynamic wavelength and bandwidth allocation method of minimum tuning in time- and wavelength-division multiplexed passive optical network |
| PCT/CN2015/089485 WO2016183972A1 (en) | 2015-05-20 | 2015-09-14 | Dynamic wavelength allocation method for minimum turning in stacked time- and wavelength-division multiplexed optical access network |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105610724A (en) * | 2016-01-08 | 2016-05-25 | 烽火通信科技股份有限公司 | Method and device for realizing load balancing in time wavelength division multiplexing passive optical network system |
| WO2016183972A1 (en) * | 2015-05-20 | 2016-11-24 | 北京邮电大学 | Dynamic wavelength allocation method for minimum turning in stacked time- and wavelength-division multiplexed optical access network |
| CN113009636A (en) * | 2021-04-12 | 2021-06-22 | 中国电子科技集团公司第四十四研究所 | Method and system for preparing dense wavelength division multiplexing device with high precision |
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| CN104168100A (en) * | 2014-07-24 | 2014-11-26 | 重庆邮电大学 | Dynamic resource scheduling method for time-division wavelength-division mixing multiplexing passive optical network |
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| US8744265B2 (en) * | 2007-04-27 | 2014-06-03 | Futurewei Technologies, Inc. | Passive optical network with partially-tuned lasers |
| CN103888382B (en) * | 2014-02-19 | 2017-02-08 | 北京邮电大学 | WDM-OFDM-PON three dimensional bandwidth distribution method and system |
| CN104901762A (en) * | 2015-05-20 | 2015-09-09 | 北京邮电大学 | Dynamic wavelength and bandwidth allocation method of minimum tuning in time- and wavelength-division multiplexed passive optical network |
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| CN104168100A (en) * | 2014-07-24 | 2014-11-26 | 重庆邮电大学 | Dynamic resource scheduling method for time-division wavelength-division mixing multiplexing passive optical network |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2016183972A1 (en) * | 2015-05-20 | 2016-11-24 | 北京邮电大学 | Dynamic wavelength allocation method for minimum turning in stacked time- and wavelength-division multiplexed optical access network |
| CN105610724A (en) * | 2016-01-08 | 2016-05-25 | 烽火通信科技股份有限公司 | Method and device for realizing load balancing in time wavelength division multiplexing passive optical network system |
| CN105610724B (en) * | 2016-01-08 | 2018-10-09 | 烽火通信科技股份有限公司 | When WDM passive optical network system in realize load balancing method and device |
| CN113009636A (en) * | 2021-04-12 | 2021-06-22 | 中国电子科技集团公司第四十四研究所 | Method and system for preparing dense wavelength division multiplexing device with high precision |
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