CN102325083A - Bandwidth allocation method and device for passive optical network (PON) with different transmission rates - Google Patents
Bandwidth allocation method and device for passive optical network (PON) with different transmission rates Download PDFInfo
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Abstract
The invention provides a bandwidth allocation method and a bandwidth allocation device for a passive optical network (PON) with different transmission rates. The method comprises the following steps of: setting a type table entry for recording the types of optical network units (ONU) with the different transmission rates in an optical line terminal (OLT); performing unified time slot allocation on the ONUs with the different transmission rates according to the table entry to form an uplink bandwidth allocation table entry by using the OLT; and bearing bandwidth allocation instructions of the ONUs with the different transmission rates to corresponding downlink optical channels with different wavelengths according to the uplink bandwidth allocation table entry respectively. The invention also provides the bandwidth allocation device for the PON with the different transmission rates.
Description
Technical field
The present invention relates to communication technical field, relate in particular to the bandwidth allocation methods and the device that are used for PON coexistence of different transmission rate.
Background technology
At present, many Internet is professional inserts from modes such as the dialing modem of 56K to several million, asymmetric digital line subscribers feeder (ADSL), cable modem (CM), VDSL respectively through transfer rate.But, for miscellaneous service is provided, like high-quality video information business, VoD (Video on Demand) business etc.; The transmission of data approximately requires to have the bandwidth of 100M; Several kinds of access waies with above-mentioned can't meet the demands, therefore, increase rapidly with the demand of optical fibre installation Access Network; EPON (PON) can satisfy these new business demands and economy, operation maintenance user access networks easily again just; Be illustrated in figure 1 as PON multicast network structural representation, (OLT) inserts signal to EPON from the optical network line terminal, distributes to each user side (ONU/ONT through Optical Distribution Network (ODN); ONT is an optic network user terminal, is located immediately at user side; And ONU is the optical-fiber network subscriber unit, and also has other network such as Ethernet between the user), can watch multi-media signal at user side.Wherein OLT is positioned at local side, and ONU/ONT is positioned at user side, and OLT is a down direction to the direction of ONU/ONT, otherwise is up direction.Down direction adopts based on time-multiplexed multicast mode, will be assigned to some output user sides by power averaging by the light signal of OLT input by ODN, branch prescription case such as generally have 1 minute 16,1 minutes 32 or 1 minutes 64.
The PON system of present commercialization is behavior 1Gbps transfer rate up and down.When 1: 32 branching ratio, each user can assign to 30M left and right sides bandwidth.Because the rise of networks such as IPTV, visual telephone service, the 30M bandwidth can not satisfy user's demand.
Therefore international main standard organizes IEEE, ITUT all setting about formulating the industrial standard of 10Gbps EPON and high transmission rates TDMA-PON.The transfer rate of 10Gbps PON will reach 10Gbps, so each user's bandwidth will raise 10 times and reach 300Mbps.
But under the situation that still has a large amount of 1Gbps PON users at present, 10Gbps PON must can with 1Gbps PON coexistence of systems.
Fig. 2 is the co-existence schemes of the optimum that obtains behind the comprehensive various factors.Descending 10Gbps ONU adopts 1550 wavelength, and 1Gbps ONU still adopts 1490 wavelength, up shared one 1310 wavelength.
In present PON, allocated bandwidth all is that the ONU with a kind of transfer rate is distributed.Yet when having different transfer rate ONU among the PON; For example be 10Gbps and 1GbpsONU; According to the shared up wavelength of related art scheme, therefore need OLT to carry out uniform dispatching in time, and need to seek a kind of bandwidth allocation methods of full blast.
Therefore, the solution that people need a kind of PON coexistence of different transmission rate Time Bandwidth to distribute can solve the problem in the above-mentioned correlation technique.
Summary of the invention
The present invention aims to provide a kind of bandwidth allocation methods and device, needs OLT to carry out problems such as uniform dispatching in time during with solution correlation technique PON coexistence of different transmission rate.
According to an aspect of the present invention, a kind of bandwidth allocation methods that is used for PON coexistence of different transmission rate is provided, has may further comprise the steps: the kind list item has been set in OLT, is used to write down the kind of different transmission rate ONU; OLT unifies time slot allocation according to above-mentioned list item to different transmission rate ONU, forms the upstream bandwidth distribution list item; And, the instruction of the allocated bandwidth of different transmission rate is carried to respectively on the descending optical channel of different wave length according to said upstream bandwidth distribution list item.
According to a further aspect in the invention, a kind of allocated bandwidth device that is used for PON coexistence of different transmission rate is provided, comprising: the kind list item is provided with module, is used at OLT the kind list item being set, with the kind of record different transmission rate ONU; The time slot allocation module is used to make OLT according to above-mentioned list item different transmission rate ONU to be unified time slot allocation, forms the upstream bandwidth distribution list item; And bandwidth allocation module, be used for according to said upstream bandwidth distribution list item, the allocated bandwidth of different transmission rate is instructed be carried to respectively on the descending optical channel of different wave length.
According to a further aspect in the invention, a kind of method of definite ONU downstream rate is provided, has may further comprise the steps:
In discovery procedure, the discovery message that sends to specific downstream rate ONU is issued through corresponding wavelength;
For the ONU of said specific downstream rate offers special discovery window, the ONU that is registered in this discovery window is confirmed as ONU with said specific downstream rate.
According to a further aspect in the invention, a kind of device of definite ONU downstream rate is provided, has comprised:
Find that message issues module, be used for, the discovery message that sends to specific downstream rate ONU is issued through corresponding wavelength in discovery procedure;
ONU downstream rate determination module, the ONU that is used to said specific downstream rate offers special discovery window, the ONU that is registered in this discovery window is confirmed as the ONU with said specific downstream rate.
According to a further aspect in the invention, a kind of definite different rates ONU is provided the affiliated method of finding window, has may further comprise the steps:
In discovery procedure, receive from ONU with find window corresponding protocols message, said protocol massages comprises identification information, the corresponding relation of window and downstream rate is found in said identification information indication;
According to downstream rate and the said identification information of ONU, confirm the discovery window that said ONU is affiliated.
According to a further aspect in the invention, a kind of definite different rates ONU is provided the affiliated device of finding window, has comprised:
Receiver module is used in discovery procedure, receive from ONU with find window corresponding protocols message, said protocol massages comprises identification information, the corresponding relation of window and downstream rate is found in said identification information indication;
Determination module according to downstream rate and the said identification information of ONU, is confirmed the discovery window that said ONU is affiliated.
Through technique scheme, the present invention utilizes the classified information of OLT management ONU, unifies time slot allocation according to classified information, thereby has realized the allocated bandwidth of full blast, and the present invention has realized following technique effect:
1) solved allocated bandwidth in PON coexistence of different transmission rate;
2) bandwidth allocation methods of full blast among a kind of PON of coexistence is provided.
Other features and advantages of the present invention will be set forth in specification subsequently, and, partly from specification, become obvious, perhaps understand through embodiment of the present invention.The object of the invention can be realized through the structure that in the specification of being write, claims and accompanying drawing, is particularly pointed out and obtained with other advantages.
Description of drawings
Fig. 1 shows the structural representation according to PON network system of the prior art;
Fig. 2 shows the PON network diagram according to 10Gbps in the prior art and 1Gbps ONU coexistence;
Fig. 3 shows the method flow diagram according to definite ONU downstream rate of the present invention;
Fig. 4 shows the block diagram according to definite ONU downstream rate device of the present invention;
Fig. 5 shows the bandwidth allocation methods flow chart that is used for PON coexistence of different transmission rate according to of the present invention;
Fig. 6 shows the block diagram that is used for the allocated bandwidth device of PON coexistence of different transmission rate according to of the present invention;
Fig. 7 shows the sketch map of the switching time of 1Gbps according to an embodiment of the invention and 10Gbps transfer rate laser respectively;
Fig. 8 shows the contrast sketch map of the guard time between the message between 1Gbps according to an embodiment of the invention and the 10Gbps transfer rate; And
Fig. 9 shows the sketch map that compares between the different bandwidth allocative efficiency according to an embodiment of the invention;
Figure 10 shows according to the method flow diagram of finding window under definite different rates ONU of the present invention;
Figure 11 shows according to the block diagram of finding the device of window under definite different rates ONU of the present invention.
Embodiment
Below with reference to accompanying drawing and combine embodiment, specify the present invention.
The present invention proposes, because different downstream rate ONU such as 10Gbps ONU adopt different downstream wavelength with 1Gbps ONU.
The embodiment of the invention provides a kind of method of definite ONU downstream rate, may further comprise the steps like Fig. 3:
Step S302 in discovery procedure, issues the discovery message that sends to specific downstream rate ONU through corresponding wavelength;
Step S304 for the ONU of said specific downstream rate offers special discovery window, confirms as the ONU that is registered in this discovery window the ONU with said specific downstream rate.
For example; In discovery procedure; The discovery message of 10Gbps ONU is issued to 10Gbps ONU through respective wavelength such as 1550nm wavelength, and opens one and aim at the discovery window that 10Gbps ONU offers, therefore as long as all be 10Gbps ONU at this ONU that finds window registration.In like manner the discovery message of 1Gbps ONU is issued to 1Gbps ONU through respective wavelength such as 1490nm wavelength, and opens one and aim at the discovery window that 1GbpsONU begins, as long as all be 1Gbps ONU at this ONU that finds window registration.
Fig. 4 shows the device 400 according to the acquisition ONU downstream rate of the embodiment of the invention, and it comprises:
Find that message issues module 402, be used for, the discovery message that sends to specific downstream rate ONU is issued through corresponding wavelength in discovery procedure;
ONU downstream rate determination module 404, the ONU that is used to said specific downstream rate offers special discovery window, the ONU that is registered in this discovery window is confirmed as the ONU with said specific downstream rate.
Optional, said specific downstream rate comprises 10Gbps or 1Gbps.When said specific downstream rate was 10Gbps, said discovery message issued module 402 and is further used for said discovery message is issued through the 1550nm wavelength.When said specific downstream rate was 1Gbps, said discovery message issued module 402 and is further used for said discovery message is issued through the 1490nm wavelength.
Because different upstream rate ONU such as 10Gbps ONU adopt identical up wavelength with 1Gbps ONU, and bimodulus or multimode rake receiver can be set, and identify the upstream rate of ONU.
Fig. 5 shows the bandwidth allocation methods that is used for PON coexistence of different transmission rate according to the embodiment of the invention, and it may further comprise the steps:
Step S502 is provided with the kind list item in OLT, be used to write down the kind of different transmission rate ONU, can identify uplink rate and the downlink transfer rate of ONU according to this kind;
Step S504, OLT unifies time slot allocation according to above-mentioned list item to different transmission rate ONU, forms the upstream bandwidth distribution list item; And
Step S506 according to said upstream bandwidth distribution list item, is carried to the instruction of the allocated bandwidth of different transmission rate respectively on the descending optical channel of different wave length.Also can the data that send to different downstream rate ONU be put into respectively on the pairing wavelength of its downstream rate.
Alternatively, different transmission rate ONU comprises high transmission rates ONU and low transfer rate ONU, and the kind list item that in OLT, is provided with comprises two kinds, is respectively high transmission rates and low transfer rate.
Step S504 can comprise ONU is divided into two groups by the transfer rate difference, makes high transmission rates ONU ascending time slot adjacent, makes low transfer rate ONU ascending time slot adjacent.
Alternatively, high transmission rates ONU is 10Gbps ONU, and low transfer rate ONU is 1Gbps ONU.
Step S504 may further comprise the steps: the allocated bandwidth instruction of the ONU of 10Gbps is put into the ONU that sends to 10Gbps on corresponding wavelength such as the 1550nm wavelength, the allocated bandwidth instruction of the ONU of 1Gbps is put into the ONU that sends to 1Gbps on corresponding wavelength such as the 1490nm wavelength.
Fig. 6 shows the allocated bandwidth device 600 that is used for PON coexistence of different transmission rate according to the embodiment of the invention, and it comprises:
The kind list item is provided with module 602, is used at OLT the kind list item being set, and with the kind of record different transmission rate ONU, can identify uplink rate and the downlink transfer rate of ONU according to this kind;
Time slot allocation module 604 is used to make OLT according to above-mentioned list item different transmission rate ONU to be unified time slot allocation, forms the upstream bandwidth distribution list item; And
Alternatively, different transmission rate ONU comprises high transmission rates ONU and low transfer rate ONU, and the kind list item that in OLT, is provided with comprises two kinds, is respectively high transmission rates and low transfer rate.
Time slot allocation module 604 can be used for ONU is divided into two groups by the transfer rate difference, makes high transmission rates ONU ascending time slot adjacent, makes low transfer rate ONU ascending time slot adjacent.
Alternatively, high transmission rates ONU is 10Gbps ONU, and low transfer rate ONU is 1Gbps ONU.
Time slot allocation module 604 can be used for the instruction of the allocated bandwidth of the ONU of 10Gbps is put into the ONU that sends to 10Gbps on the 1550nm wavelength, and the allocated bandwidth instruction of the ONU of 1Gbps is put into the ONU that sends to 1Gbps on the 1490nm wavelength.
Can find out that from above description the present invention utilizes the classified information of OLT management ONU, unifies time slot allocation according to classified information, thereby has realized the allocated bandwidth of full blast.
OLT is recorded in the classified information of these ONU in the list item, and is as shown in table 1:
Table 1
| Sequence number | Transfer rate | Sequence number |
| 1 | 10Gbps | 12654 |
| 2 | 10Gbps | 25846 |
| 3 | 1Gbps | 98542 |
In PON network shown in Figure 2, comprise the ONU of two kinds of different transmission rates, the physical layer parameter of their optical modules has bigger difference, and is as shown in table 2:
Table 2
Fig. 7 shows the sketch map of the switching time of 1Gbps according to an embodiment of the invention and 10Gbps transfer rate laser respectively.
With reference to Fig. 7, in the PON of high transmission rates low transfer rate ONU coexistence, because two kinds of shared same up wavelength of ONU must carry out time slot allocation to the ONU unification of two kinds of transfer rates when therefore carrying out allocated bandwidth.In distributing the process of time slot, consider two kinds of ONU physical parameter on difference.For example the clock recovery time of the laser switching time of 1Gbps ONU and OLT all slow many than 10Gbps, therefore many greatly than 10Gbps of the interval between the uplink message that sends of different 1Gbps ONU.
The effect of guard time is that after laser distributed message, closing laser also needed a period of time, before laser thoroughly is closed, still can send laser, disturbed the communication of other ONU.And the laser of the ONU of the transmission message of back is opened and is also needed the regular hour, before thoroughly opening, also can send laser, but power can not satisfy the proper communication requirement.
Fig. 8 shows the contrast sketch map of the guard time between the message between 1Gbps according to an embodiment of the invention and the 10Gbps transfer rate.Fig. 9 shows the sketch map that compares between the different bandwidth allocative efficiency according to an embodiment of the invention.
With reference to Fig. 8; Because the switching time of the laser of the ONU of 1Gbps is more a lot of than the length of 10Gbps; If the message of 10Gbps message and 1Gbps is adjacent; The ONU of 10Gbps will wait for that the ONU of 1Gbps thoroughly closes laser, could send upward signal, and guard time between the two is than all being the much longer of 10Gbps.And when in OLT, gaining with clock recovery fast, if variation has taken place for transfer rate and power, the circuit response also will expend more time.With reference to Fig. 9, if the 10Gbps uplink message is divided into one group, the uplink message of 1Gbps is divided into one group, the allocative efficiency of raising upstream bandwidth that then can be bigger.
OLT forms an allocated bandwidth list item after the ONU to two kinds of different transfer rates unifies time slot allocation, as shown in table 3:
Table 3
| ON | Time started | During end |
| UID | Between | |
| 1 | 00 | 11 |
| 2 | 13 | 18 |
| 3 | 20 | 28 |
| 4 | 35 | 42 |
| 5 | 49 | 58 |
OLT is according to the content of this list item, and the allocated bandwidth instruction of the ONU of 10Gbps is put into the ONU that sends to 10Gbps on the 1550nm wavelength.The allocated bandwidth instruction of the ONU of 1Gbps is put into the ONU that sends to 1Gbps on the 1490nm wavelength.
The embodiment of the invention also provides a kind of definite different rates ONU the affiliated method of finding window, and shown in figure 10, handling process is following:
Step S1002, in discovery procedure, receive from ONU with find window corresponding protocols message, said protocol massages comprises identification information, the corresponding relation of window and downstream rate is found in said identification information indication;
Step S1004 according to downstream rate and the said identification information of ONU, confirms the discovery window that said ONU is affiliated.
The embodiment of the invention also provides a kind of definite different rates ONU the affiliated device of finding window, and is shown in figure 11, comprising:
From above description, can find out that the present invention has realized following technique effect:
In the embodiment of the invention, ONU is carried out time slot allocation, form the upstream bandwidth distribution list item, can make the efficient of allocated bandwidth higher according to the upstream rate of ONU; According to said upstream bandwidth distribution list item; Allocated bandwidth is instructed to send to ONU with the corresponding wavelength of the downstream rate of ONU; Thereby when different rates PON coexists; Speed and bandwidth, wavelength is corresponding, realize OLT uniform dispatching in time, the allocated bandwidth solution when forming different rates PON coexistence.
In the embodiment of the invention, in discovery procedure, the discovery message that sends to specific downstream rate ONU is issued through corresponding wavelength; For the ONU of said specific downstream rate offers special discovery window, as long as follow-up through in said discovery window registration, the downstream rate that can confirm ONU is said specific downstream rate, thereby makes the acquisition of downstream rate simple and fast.In addition, the embodiment of the invention is used to indicate the corresponding relation of finding window and downstream rate through in discovery procedure, introducing identification information; Follow-up downstream rate and said identification information according to ONU can be confirmed the discovery window that said ONU is affiliated, offer the different solutions of finding windows thereby be embodied as different rates ONU.
Obviously, it is apparent to those skilled in the art that above-mentioned each module of the present invention or each step can realize with the general calculation device; They can concentrate on the single calculation element; Perhaps be distributed on the network that a plurality of calculation element forms, alternatively, they can be realized with the executable program code of calculation element; Thereby; Can they be stored in the storage device and carry out, perhaps they are made into each integrated circuit modules respectively, perhaps a plurality of modules in them or step are made into the single integrated circuit module and realize by calculation element.Like this, the present invention is not restricted to any specific hardware and software combination.Should be understood that the variation in these practical implementations is conspicuous for a person skilled in the art, do not break away from spiritual protection range of the present invention.
The above is merely the preferred embodiments of the present invention, is not limited to the present invention, and for a person skilled in the art, the present invention can have various changes and variation.All within spirit of the present invention and principle, any modification of being done, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1. the method for a definite ONU downstream rate is characterized in that, may further comprise the steps:
In discovery procedure, the discovery message that sends to specific downstream rate ONU is issued through corresponding wavelength;
For the ONU of said specific downstream rate offers special discovery window, the ONU that is registered in this discovery window is confirmed as ONU with said specific downstream rate.
2. the method for claim 1 is characterized in that, said specific downstream rate comprises 10Gbps or 1Gbps.
3. method as claimed in claim 2 is characterized in that, when said specific downstream rate was 10Gbps, said discovery message issued through the 1550nm wavelength.
4. method as claimed in claim 2 is characterized in that, when said specific downstream rate was 1Gbps, said discovery message issued through the 1490nm wavelength.
5. the device of a definite ONU downstream rate is characterized in that, comprising:
Find that message issues module, be used for, the discovery message that sends to specific downstream rate ONU is issued through corresponding wavelength in discovery procedure;
ONU downstream rate determination module, the ONU that is used to said specific downstream rate offers special discovery window, the ONU that is registered in this discovery window is confirmed as the ONU with said specific downstream rate.
6. device as claimed in claim 5 is characterized in that, said specific downstream rate comprises 10Gbps or 1Gbps.
7. device as claimed in claim 6 is characterized in that, when said specific downstream rate was 10Gbps, said discovery module was further used for said discovery message is issued through the 1550nm wavelength.
8. device as claimed in claim 6 is characterized in that, when said specific downstream rate was 1Gbps, said discovery module was further used for said discovery message is issued through the 1490nm wavelength.
9. the affiliated method of finding window of definite different rates ONU is characterized in that, may further comprise the steps:
In discovery procedure, receive from ONU with find window corresponding protocols message, said protocol massages comprises identification information, the corresponding relation of window and downstream rate is found in said identification information indication;
According to downstream rate and the said identification information of ONU, confirm the discovery window that said ONU is affiliated.
10. the affiliated device of finding window of definite different rates ONU is characterized in that, comprising:
Receiver module is used in discovery procedure, receive from ONU with find window corresponding protocols message, said protocol massages comprises identification information, the corresponding relation of window and downstream rate is found in said identification information indication;
Determination module according to downstream rate and the said identification information of ONU, is confirmed the discovery window that said ONU is affiliated.
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| CN107026690A (en) * | 2015-09-22 | 2017-08-08 | 爱斯福公司 | Measuring light power in EPON |
| WO2019042457A1 (en) * | 2017-09-04 | 2019-03-07 | 中兴通讯股份有限公司 | Bandwidth allocation method, apparatus and system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP2008270898A (en) * | 2007-04-16 | 2008-11-06 | Sumitomo Electric Ind Ltd | Optical subscriber line terminal |
| CN101984777B (en) * | 2009-05-28 | 2013-06-12 | 富士通网络通讯株式会社 | Passive optical network system, station equipment in passive optical network system, and a control method thereof |
| JP5997088B2 (en) | 2013-03-29 | 2016-09-28 | 株式会社日立製作所 | Dynamic bandwidth allocation method, OLT, and PON system |
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| WO2019042457A1 (en) * | 2017-09-04 | 2019-03-07 | 中兴通讯股份有限公司 | Bandwidth allocation method, apparatus and system |
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| WO2008055438A1 (en) | 2008-05-15 |
| JP2010509812A (en) | 2010-03-25 |
| JP4891410B2 (en) | 2012-03-07 |
| CN102325083B (en) | 2014-11-05 |
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