CN101212255A - Dynamic bandwidth adjustment and fault protection method and device for optical access network - Google Patents
Dynamic bandwidth adjustment and fault protection method and device for optical access network Download PDFInfo
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- CN101212255A CN101212255A CNA2006101698548A CN200610169854A CN101212255A CN 101212255 A CN101212255 A CN 101212255A CN A2006101698548 A CNA2006101698548 A CN A2006101698548A CN 200610169854 A CN200610169854 A CN 200610169854A CN 101212255 A CN101212255 A CN 101212255A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L41/00—Arrangements for maintenance, administration or management of data switching networks, e.g. of packet switching networks
- H04L41/08—Configuration management of networks or network elements
- H04L41/0896—Bandwidth or capacity management, i.e. automatically increasing or decreasing capacities
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J14/00—Optical multiplex systems
- H04J14/02—Wavelength-division multiplex systems
- H04J14/0278—WDM optical network architectures
- H04J14/0282—WDM tree architectures
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J14/00—Optical multiplex systems
- H04J14/02—Wavelength-division multiplex systems
- H04J14/0287—Protection in WDM systems
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Abstract
The invention discloses a method of dynamic adjustment and fault protection for an optical accessing network bandwidth and a device thereof, which belongs to a field of optical accessing network. The invention provides a method for the combination of fixed bandwidth and dynamic bandwidth to increase the flexibility of the dynamic bandwidth adjustment, reduce cost, save resources, simplify network and scheduling mechanism. The method comprises the following processes: a downlink channel of the dynamic bandwidth is started when an OLT detects that downlink business information sent to an ONUx exceeds the transmission ability of the downlink channel at the ONUx fixed bandwidth; the downlink business information of the ONUx is sent by the OLT through downlink channel at the fixed bandwidth and downlink channel at the dynamic bandwidth; the downlink business information is received by an OUNx from the downlink channel at the fixed bandwidth and downlink channel at the dynamic bandwidth. The invention also provides a device of dynamic adjustment and fault protection for the optical accessing network bandwidth.
Description
Technical field
The present invention relates to the Optical Access Network field, the method and apparatus of adjustment of particularly a kind of Optical Access Network Bandwidth Dynamic and error protection.
Background technology
Along with the continuous growth of user bandwidth demand, traditional copper cash broadband access system more and more faces bandwidth bottleneck.Meanwhile, the optical fiber communication that bandwidth capacity is huge is increasingly mature, and application cost descends year by year, makes FTTx strengthen day by day in the Application in Access Network demand.In FTTx,, can be divided into fiber-to-the-home (Fiber To The Home-FTTH) and fiber-to-the-node (Fibre To The Node-FTTN) according to optical fiber different from the distance of user distance and application demand.Adopt in the sub-district that twisted-pair feeder or category-5 cable or coaxial cable register one's residence the sub-district that FTTH relatively is fit to be deployed in is newly-built, optical fiber has been taped against family, and FTTN relatively is fit to be deployed in optical fiber and has moved sub-district or building to.
In FTTH, optical fibre installation has arrived each family or office, realized that full optical fiber inserts, TDM-PON (the Time Division Multiplexing-Passive OpticalNetwork-time division multiplexing passive optical network) mode of main employing point-to-multipoint (Point to MultiPoint-P2MP) realizes at present, BPON (Broadband Passive Optical Network-broadband passive optical networking) for example, EPON (Ethernet Passive Optical Network-Ethernet passive optical network), GPON (Gigabit Passive Optical Network-1000 M passive optical networking) etc.Fig. 1 has provided the functional schematic of a kind of typical TDM-PON: an EPON comprises the optical line terminal (OpticalLine Terminal-OLT) that is positioned at central office (Central Office-CO), an optical distribution network (Optical Distribution Network-ODN) and many optical network units (Optical Network Unit-ONU), TDM-PON adopts time division multiple access to insert the multiplexing upstream bandwidth of mode of (Time Division Multiple Access-TDMA) at the multiplexing downlink bandwidth of the time-multiplexed mode of descending employing at up each ONU.Though BPON, EPON have obtained in areas such as Japan and North Americas using more on a large scale at present, GPON also just progressively steps into commercial stage, but the TDM-PON network configuration has born deficiency, for example the loss of splitter branched power is big, up-high speed burst transmitting-receiving difficulty is big etc., make it have the bandwidth upgrading difficulty, the technological deficiency that fiber failure location difficulty etc. can't overcome.
In FTTN, with the media of optical fiber as the bottom data transmission, move each residential area or shopping centre node to, adopt Ethernet switch, Digital Subscriber Line Access Multiplexer equipment such as (Digital Subscriber Line AccessMultiplexer-DSLAM) to converge then, register one's residence with traditional twisted-pair feeder, coaxial cable or category-5 cable etc., thereby the reduction O﹠M cost prolongs communication distance.At present, FTTN mainly adopts point-to-point mode to realize, simple in structure, the advantages such as easy and protocol transparent of upgrading that point-to-point transmission has, but because the integrated level of point-to-point transceiver is low, caused deficiencies such as the fiber bandwidth utilance is low, power system capacity is more limited.Deficiency at point-to-point optical transmission, WDM-PON (Wavelength DivisionMultiplexing-Passive Optical Network-Wavelength division multiplexing-passive optical networking) technology is because of optical fiber utilance efficiently, huge bandwidth capacity, bigger power system capacity and cause people's attention day by day.
Fig. 2 has provided and has adopted WDM-PON to realize the functional schematic of FTTN.But when realizing FTTN, network design can only be with the maximum bandwidth demand of business as the network design standard, bandwidth demand has only professional dimension, suppose that promptly the shopping centre needs the downstream transmission bandwidth of 5Gbps in the busiest, the residential area needs the downstream transmission bandwidth of 2.5Gbps in the time of the busiest, the Rx of Txn on the OLT and ONUn must design with the speed of 5Gbps when network design so, and the Rx of last Tx1 of OLT and ONU1 must design with the speed of 2.5Gbps.In fact, bandwidth demand is except having professional dimension, also has time dimension, the bandwidth demand amount very big (5Gbps) of business by day time the such as the shopping centre, and only need a basic bandwidth demand (1.25Gbps even lower just enough), festivals or holidays and regular working day to have very big difference equally at night; In like manner, the residential area is by day the time, and most people have gone to work, only need a 1.25Gbps even lower bandwidth, and at night, required bandwidth rises significantly but, need 2.5Gbps to be far more than higher bandwidth demand, the very big difference of same existence of festivals or holidays and regular working day.
At the problems referred to above, geographical BAP, Bandwidth Allocation Protocol has appearred, and its basic thought is by adopting tunable laser, realize that WDM combines with TDM, simultaneously, all tunable lasers of scheduling in global scope, for each TDM-PON service, realize geographical allocated bandwidth.Such as, the required bandwidth of family's residence network on daytime is very little, and sowntown bandwidth is very nervous, can use to a part of bandwidth scheduling of the tunable laser of serving for family's residence network sowntown user this moment, then can dispatch on the contrary in the time of evening, thereby realize geographical allocated bandwidth, improve the service efficiency of Internet resources.
As shown in Figure 3, have on the central office as if a dried tunable laser TX/RX, each tunable laser can be dispatched in global scope, is any TDM-PON service of RN1 back.Because each tunable laser can be that any ONU in any TDM-PON network serves by time division multiplexing ground, thereby can carry out the Bandwidth Dynamic adjustment according to the different bandwidth demand of different ONU the difference time.This kind technology has adopted two-layer time division multiplexing nested: at first each tunable laser carries out time division multiplexing between each TDM-PON network, and on this basis, each tunable laser carries out one time time division multiplexing again between the ONU of each TDM-PON network internal.Owing to adopted two-layer time division multiplexing nested, scheduling mechanism will be very complicated.In addition, owing to tunable laser costs an arm and a leg, so the cost of this kind technical scheme also will be quite expensive.
Summary of the invention
For the flexibility that improves the dynamic bandwidth adjustment, reduce cost, save resource, simplify network and scheduling mechanism, the embodiment of the invention has proposed the method that a kind of fixed-bandwidth and dynamic bandwidth combine, this method can be set up fixed-bandwidth down going channel and dynamic bandwidth down going channel between each ONU and OLT, and carries out following steps:
Steps A: OLT detects the transmittability that the downlink business information that sends to ONUx surpasses the fixed-bandwidth down going channel of ONUx, enables the dynamic bandwidth down going channel;
Step B:OLT sends the downlink business information of the described ONUx of sending to by described fixed-bandwidth down going channel and dynamic bandwidth down going channel;
Step C:OUNx receives described downlink business information from described fixed-bandwidth down going channel and dynamic bandwidth down going channel.
Also comprise after the described step C: when OLT detects the downlink business information that sends to ONUx and surpasses the transmittability of fixed-bandwidth down going channel of ONUx, OLT stops the shunting to the downlink business information of described ONUx, close of the shunting of the downlink business information of described ONUx, and send control message notifying ONUx at the dynamic bandwidth down going channel.
Described method step B specifically comprises:
OLT is according to the load balancing algorithm, with the downlink business information of the described ONUx of sending to share be modulated in the described fixed-bandwidth down going channel and described dynamic bandwidth down going channel in.
Described fixed-bandwidth down going channel provides the fixed-bandwidth of monopolizing for each ONU; Described dynamic bandwidth down going channel provides the dynamic bandwidth of scheduling as required for each ONU.
The embodiment of the invention has also proposed a kind of method of Optical Access Network error protection, when the fixed-bandwidth down going channel breaks down, said method comprising the steps of:
Steps A: OLT receives alarm, enables the dynamic bandwidth down going channel;
The downlink business information that step B:OLT will send to ONUx sends by described dynamic bandwidth down going channel;
Step C:ONUx receives described downlink business information from described dynamic bandwidth down going channel.
Described fixed-bandwidth down going channel breaks down and is specially reflector and breaks down.
When described reflector broke down, described method specifically comprised:
Step a:OLT receives alarm, starts tunable laser, adjusts the wavelength of described tunable laser;
Step b:OLT will originally need be modulated to by the downlink business information that the fault reflector sends in the light signal that described tunable laser launches, and the light signal after will modulating sends to ONUx;
Step c:ONUx receives light signal after the described modulation by receiver.
The embodiment of the invention provides the device of adjustment of a kind of Optical Access Network Bandwidth Dynamic and error protection, and described device comprises flow detection module, downlink business shunting information module and error protection administrative message processing module;
Described flow detection module is used to detect the transmittability whether the downlink business information that sends to ONUx surpasses the fixed-bandwidth down going channel of ONUx, if surpass, then described flow detection module transmission flow-dividing control instruction and downlink business information are to described downlink business shunting information module, otherwise described flow detection module sends to described downlink business shunting information module with downlink business information;
Described error protection administrative message processing module is used for the failover message that receives is handled, and sends the flow-dividing control instruction to described downlink business shunting information module;
After described downlink business shunting information module is used to receive the flow-dividing control instruction and downlink business information that described flow detection module and described error protection administrative message processing module send, send after downlink business information shunted.
This device comprises that also the fixed-bandwidth down going channel sends control module, and described fixed-bandwidth down going channel sends control module and comprises control unit and transmitting element;
Described control unit is used for receiving according to business information the difference of object, controls the wavelength of optical signal of corresponding generating laser;
Described transmitting element is used for business information is modulated to the light signal of described generating laser emission, and sends.
This device comprises that also the dynamic bandwidth down going channel sends control module, and described dynamic bandwidth down going channel sends control module and comprises control unit and transmitting element;
Described control unit is used for sending according to business information the difference of priority, the wavelength of optical signal of control tunable laser;
Described transmitting element is used for business information is modulated to the light signal of described tunable laser emission, and sends.
The embodiment of the invention also provides a kind of Optical Access Network device, and described device comprises fixed-bandwidth down going channel receiver module, dynamic bandwidth down going channel receiver module and uplink service sending module;
Described fixed-bandwidth down going channel receiver module is used for receiving downlink business information from the fixed-bandwidth down going channel;
Described dynamic bandwidth down going channel receiver module is used for breaking down or downlink business information when surpassing the transmittability of fixed-bandwidth down going channel when the fixed-bandwidth down going channel, receives downlink business information from the dynamic bandwidth down going channel;
Described uplink service sending module is used to send uplink service information.
Described device receives downlink business information from described fixed-bandwidth down going channel and/or described dynamic bandwidth down going channel simultaneously.
Beneficial effect:
1. owing between each ONU and OLT, set up fixed-bandwidth down going channel and dynamic bandwidth down going channel, one of them is for exclusively enjoying passage, another is a sharing channel, so each ONU has a wavelength channel that exclusively enjoys to guarantee minimum bandwidth, but also can provide dynamic extra bandwidth according to the size of the downlink business information of each ONU.
2. shared by all ONU owing to the dynamic bandwidth down going channel, thus resource utilization height of the present invention, and owing to only need a spot of tunable laser, so realize that cost of the present invention is lower, the cost performance height.
3. because the introducing of tunable laser when the feasible laser that exclusively enjoys as a certain ONU breaks down, can be modulated to downlink business information in the light signal of tunable laser output in time, played the function of error protection.
4. because the present invention, takes the method shunted by dynamic bandwidth down going channel (tunable laser) to the downlink business information of the fixed-bandwidth down going channel load capacity that surpasses ONU, make scheduling mechanism simple and flexibly.
Description of drawings
Fig. 1 is an EPON functional schematic in the prior art;
Fig. 2 is the functional schematic that available technology adopting WDM-PON realizes FTTN;
Fig. 3 is the schematic diagram that available technology adopting WDM and TDM realize Bandwidth Dynamic Allocation;
Fig. 4 is the Bandwidth Dynamic adjustment of embodiment of the invention single node overload and the WDM-PON schematic diagram of failure protection function;
Fig. 5 is the FSR periodicity schematic diagram of prior art medium wavelength routing module AWG;
Fig. 6 is the functional schematic of prior art medium wavelength routing module AWG;
Fig. 7 is the flow chart of the embodiment of the invention 1;
Fig. 8 is the Bandwidth Dynamic adjustment of embodiment of the invention multinode overload and the WDM-PON schematic diagram of failure protection function;
Fig. 9 is the flow chart of the embodiment of the invention 2;
Figure 10 is the WDM-PON schematic diagram that embodiment of the invention Optical Access Network has failure protection function;
Figure 11 be the wavelength of embodiment of the invention tunable laser between λ 1 ~ (FSR+ λ n), realize the flow chart of error protection;
Figure 12 be the wavelength of embodiment of the invention tunable laser between (FSR+ λ 1) ~ (FSR+ λ n), realize the flow chart of error protection;
Figure 13 is the structure chart of the device of the Optical Access Network Bandwidth Dynamic adjustment that provides of the embodiment of the invention and error protection;
Figure 14 is the structure chart of the Optical Access Network device that provides of the embodiment of the invention.
Embodiment
The invention will be further described below in conjunction with the drawings and specific embodiments, but not as a limitation of the invention.
In order to provide dynamic bandwidth to adjust function for each FTTN node, the embodiment of the invention can be set up fixed-bandwidth down going channel and dynamic bandwidth down going channel between each ONU and OLT, wherein the fixed-bandwidth down going channel is used to this ONU that fixed-bandwidth is provided, be called first passage, the dynamic bandwidth down going channel is called second channel for ONU provides dynamic bandwidth.In the little period of downlink load, downlink data does not need to send by second channel, and ONU is downlink data receiving in first passage only; And when heavy traffic, downlink load exceeds the transmittability of first passage, and OLT will in time enable second channel according to the monitored results of buffering area or the request of ONU, dynamically satisfy the bandwidth demand of this ONU.First passage is monopolized for each ONU, and second channel is shared by all ONU among the whole PON, and OLT can be according to demand carries out time division multiplexing dispatching in the global scope to second channel.
As shown in Figure 4, be the first passage that the transceiver of λ 1 has constituted ONU1 by wavelength between OLT and the ONU1, be the first passage that the transceiver of λ 2 has constituted ONU2 by wavelength between OLT and the ONU2, be the first passage that the transceiver of λ n has constituted ONUn by wavelength between OLT and the ONUn, these first passages are that each ONU monopolizes, for each ONU provides fixed-bandwidth.In order to make each ONU can the time division multiplexing second channel, the present invention makes full use of FSR (the free spectral range of the Free Spectrum Range-) periodic characteristic of wavelength routing module AWG, on OLT, adopt a tunable laser, tunable laser is by the wavelength adjustment, can communicate by letter to timesharing, thereby realize the shared second channel of all ONU with any ONU.The wavelength of this tunable laser can be adjusted on any wavelength between (FSR+ λ 1) ~ (the FSR+ λ n).The FSR periodicity principle of AWG as shown in Figure 5.
As shown in Figure 6, the FSR of the AWG module of a 1 * N periodically principle is: when its input input wavelength is respectively N light signal of λ 1 ~ λ n, output wavelength is the light signal of λ 1 on first output, and N output output wavelength is the light signal of λ n; According to the FSR of AWG periodically, when wavelength is input to the input of above-mentioned AWG for the light signal of (n * FSR+ λ 1), also will export on first output of AWG, in like manner, the light signal of (n * FSR+ λ n) will be exported on N the output of AWG.
The transceiver controller of OLT has the flow monitoring statistical function, and the relevant portion of finishing these functions is called as the flow monitoring statistical module, and it can monitor and add up the downlink data flow that sends to each ONU from the needs of upper level equipment.If statistical result showed sends to the bandwidth capacity that the downlink data flow of ONUx surpasses the first passage that ONUx monopolizes, the transceiver controller of OLT will be controlled tunable laser, enable second channel and share the load of the first passage of ONUx, thereby reach the purpose that dynamic bandwidth is adjusted.For example by day the time, be positioned at sowntown ONUn heavy traffic, depend merely on the downlink bandwidth demand that first passage can't satisfy the user, this moment, the flow monitoring statistical module detected the transmitting capacity that the data traffic that sends to ONUn has exceeded Txn, and sent alarm to the transceiver controller of OLT.The transceiver controller of OLT receives after the alarm, will enable tunable laser and its wavelength be adjusted to (FSR+ λ n).Simultaneously, OLT will notify ONUn by administrative message, do the preparation of downlink data receiving simultaneously on Rx1 and Rx2, after ONUn is ready to, will send a confirmation message to OLT.After OLT receives the confirmation message, the transceiver controller of OLT is according to certain load balancing algorithm, needs from upper level equipment are sent to the downlink data separated into two parts of ONUn, a part is delivered to the transmission buffering area of tunable laser and is sent to ONUn by wavelength for the light signal of (FSR+ λ n), and another part is delivered in the transmission buffering area of Txn and is that the light signal of λ n sends to ONUn by wavelength.
Referring to Fig. 4 and Fig. 7, the first passage overload with 1 shopping centre node OUNn is an example below, and Mingguang City's access network is realized the method that Bandwidth Dynamic is adjusted, and its concrete steps are as follows:
The flow monitoring statistical module of the transceiver controller of step 101:OLT detects the transmittability that the data traffic that sends to ONUn has exceeded its first passage, sends the transceiver controller of alarm to OLT.
The transceiver controller of step 102:OLT is received alarm, and OLT sends administrative message notice ONUn and does the preparation of downlink data receiving simultaneously on Rx1 and Rx2.
Step 103:ONUn receives administrative message, is ready to receive data from Rx1 and Rx2, and sends confirmation message to OLT.
Step 104:OLT enables tunable laser, and its wavelength is adjusted to (FSR+ λ n) after receiving the affirmation message of ONUn transmission.The transceiver controller of OLT is according to certain load balancing algorithm simultaneously, will send to the data separated into two parts of ONUn, part data-modulated is in the light signal of (FSR+ λ n) to wavelength, and the light signal after will modulating sends in the coupler, another part data-modulated is in the light signal of λ n to wavelength, the carrying that AWG1 will receive the wavelength of data be that the downlink optical signal of λ 1 ~ λ n is multiplexed into a light signal, also send in the coupler.
Step 105: coupler sends to AWG3 with the mixed light signal of receiving by circulator.
Circulator sends to the AWG3 that is positioned at the far-end node to the light signal from coupler on the one hand, on the other hand the light signal from AWG3 is sent to AWG2.
Step 106:AWG3 is with the mixed light signal demultiplexing of receiving, is wavelength that the light signal of λ 1 sends to ONU1, is wavelength that the light signal of λ 2 sends to ONU2, is wavelength that the light signal of λ n sends to ONUn, simultaneously, the wavelength from tunable laser is sent to ONUn for the light signal after the modulation of (FSR+ λ n).
Step 107:ONUn receives the light signal that carries data respectively from Rx1 and Rx2, and other ONUx receives the light signal of carrying data from Rx1.
ONUn both can receive and be carried on wavelength is data on the λ n, can receive again to be carried on wavelength and to be the data on (FSR+ λ n), thereby enlarge the downlink bandwidth of ONUn.
The transceiver controller of OLT is enabled tunable laser for after ONUn provides the second channel transmitting downlink data, monitoring sends to ONUn from the needs of upper level equipment data traffic will be continued, if the statistical result showed first passage of flow monitoring statistical module is the transmission that Txn self can finish these data traffics, then stop shunting and tunable laser, and transmission control message notifying ONUn closes Rx2 to Txn.
Referring to Fig. 8 and Fig. 9, transshipping simultaneously with the first passage of 2 shopping centre node ONU2 and ONUn below is example, and the method that realizes that the Optical Access Network Bandwidth Dynamic is adjusted is described, its concrete steps are as follows:
The flow monitoring statistical module of the transceiver controller of step 201:OLT detects the transmittability that the data traffic that sends to ONU2 and ONUn has all exceeded they first passages simultaneously, sends the transceiver controller of alarm to OLT.
The transceiver controller of step 202:OLT is received alarm, and OLT sends administrative message notice ONU2 and ONUn does the preparation of downlink data receiving simultaneously on Rx1 and Rx2.
Step 203:ONU2 and ONUn receive administrative message, are ready to receive data from Rx1 and Rx2, and send confirmation message to OLT.
Step 204:OLT enables tunable laser after receiving the affirmation message of ONU2 and ONUn transmission.The transceiver controller of OLT is according to certain load balancing algorithm simultaneously, will send to the data separated into two parts of ONU2 and ONUn, (wavelength of wavelengthtunable laser will be under the control of transceiver controller in wavelength is the light signal of (FSR+ λ 2) and (FSR+ λ n) for part data-modulated, time-division switches between (FSR+ λ 2) and (FSR+ λ n)), another part data-modulated is in the light signal of λ 2 and λ n to wavelength, send in the coupler, the carrying that AWG1 will receive the wavelength of data be that the downlink optical signal of λ 1 ~ λ n is multiplexed into a light signal, also send in the coupler.
Step 205: coupler sends to AWG3 with the mixed light signal of receiving by circulator.
Circulator sends to the AWG3 that is positioned at the far-end node to the light signal from coupler on the one hand, on the other hand the light signal from AWG3 is sent to AWG2.
Step 206:AWG3 is with the mixed light signal demultiplexing of receiving, is wavelength that the light signal of λ 1 sends to ONU1, is wavelength that the light signal of λ 2 sends to ONU2, is wavelength that the light signal of λ n sends to ONUn, sending to ONU2 and ONUn from the wavelength of tunable laser respectively for the light signal of (FSR+ λ 2) and (FSR+ λ n).
Step 207:ONU2 and ONUn receive the light signal that carries data respectively from Rx1 and Rx2, and other ONUx receives the light signal of carrying data from Rx1.
When exceeding the transmittability of first passage simultaneously for a plurality of nodes, the transceiver controller of OLT will be controlled tunable laser time-division ground and share load for these nodes.Generally speaking, the transceiver controller of OLT can decide earlier which node to share load for according to emergency and these two dimensions of overload quantity, for which node is shared a little loads more.Promptly share the node of load for needs, it is its service that the transceiver controller of OLT can go earlier, then goes the node service for other again.In the present embodiment, the transceiver controller control tunable laser of OLT is the service of ONU2 node earlier, and then be that the OUNn node is served, the transceiver controller control tunable laser of same OLT also can be the service of ONUn node earlier, and then being the service of OUN2 node, this will handle according to the concrete condition of two nodes.Exceed the transmittability of their first passages simultaneously for a plurality of dwelling house nodes, for example, this situation will appear in the period of heavy traffic at night, and the method that present embodiment is narrated can realize the Bandwidth Dynamic adjustment equally.
The embodiment of the invention not only can provide the dynamic adjustment of bandwidth, but also can realize the Optical Access Network failure protection function.As shown in figure 10, some in reflector Tx1 ~ Txn, when breaking down as Txn, the transceiver controller of OLT will be received the alarm of emitter failures.The transceiver controller of OLT receives after the emitter failures alarm according to the size of tunable laser adjustable extent, the solution of two kinds of error protections is arranged.
Embodiment 3
When the wavelength-tunable scope of tunable laser is between λ 1 ~ (FSR+ λ n),, need OLT end and the common cooperation of ONUn end in order to realize error protection.Concrete steps in OLT end and ONUn end realization error protection are as follows, referring to Figure 10 and Figure 11:
1. hold at OLT:
The transceiver controller of step 301:OLT is received the fault warning of reflector Txn, will close Txn.
The transceiver controller of step 302:OLT checks whether tunable laser has vacant transmitting capacity, if having, then execution in step 303, otherwise execution in step 307.
Step 303: the wavelength at tunable laser is in the time slot of λ n, and the transceiver controller of OLT sends reflector handoff request message to ONUn, and the timer that to start a time be Tout1.
Step 304: in the time, whether the transceiver controller inspection of OLT has received that the reflector that ONUn sends switches confirmation message, switches confirmation message if received reflector at Tout1, and then execution in step 305, otherwise execution in step 306.
The transceiver controller termination timing device of step 305:OLT is in the time slot of λ n at the wavelength of tunable laser, the downlink data that sends to ONUn is modulated in the light signal that wavelength is λ n, and this light signal is sent to ONUn.
Step 306:ONUn has abandoned error protection, and the termination failure protection is attempted, and sends alarm, and finishes.
The transceiver controller of step 307:OLT checks that tunable laser whether can the release portion transmitting capacity, if then execution in step 303, otherwise execution in step 308.
Step 308: tunable laser is occupied, can't carry out error protection, sends alarm, and finishes.
2. hold at ONUn:
The transceiver controller of step 401:ONUn is received the alarm that downstream signal is lost, and the timer that to start a time be Tout2.
Step 402: in the time, whether the transceiver controller inspection of ONUn receives reflector handoff request message from Rx1 at Tout2, if then execution in step 403, otherwise execution in step 404.
The transceiver controller of step 403:ONUn sends reflector and switches the transceiver controller of confirmation message to OLT, restarts the downlink data receiving at Rx1.
The transceiver controller of step 404:OLT is not supported error protection, abandons attempting, and sends alarm.
In order to guarantee that error protection is achieved, generally the time value Tout1 of timer is far longer than Tout2, guarantees can receive in the time that at Tout1 reflector switches confirmation message.
Embodiment 4
When the wavelength-tunable scope of tunable laser is between (FSR+ λ 1) ~ (FSR+ λ n),, need OLT end and the common cooperation of ONUn end in order to realize error protection.Concrete steps in OLT end and ONUn end realization error protection are as follows, referring to Figure 10 and Figure 12:
1. hold at OLT:
The transceiver controller of step 501:OLT is received the fault warning of reflector Txn, will close Txn.
The transceiver controller of step 502:OLT checks whether tunable laser has vacant transmitting capacity, if having, then execution in step 503, otherwise execution in step 507.
Step 503: the wavelength at tunable laser is in the time slot of (FSR+ λ n), and the transceiver controller sendaisle handoff request message of OLT is given ONUn, and the timer that to start a time be Tout1.
Step 504: in the time, whether the transceiver controller inspection of OLT has received that the passage that ONUn sends switches confirmation message, switches confirmation message if received passage at Tout1, and then execution in step 505, otherwise execution in step 506.
The transceiver controller termination timing device of step 505:OLT is in the time slot of (FSR+ λ n) at the wavelength of tunable laser, and the downlink data that sends to ONUn is modulated to wavelength in the light signal of (FSR+ λ n), and this light signal is sent to ONUn.
Step 506:ONUn does not support error protection or has abandoned error protection that the termination failure protection is attempted, and sends alarm, and finishes.
The transceiver controller of step 507:OLT checks that tunable laser whether can the release portion transmitting capacity, if then execution in step 503, otherwise execution in step 508.
Step 508: tunable laser is occupied, can't carry out error protection, sends alarm, and finishes.
2. hold at ONUn:
The transceiver controller of step 601:ONUn is received the alarm that downstream signal is lost, and enables the Rx2 receiver, and the timer that to start a time be Tout2.
Step 602: in the time, whether the transceiver controller inspection of ONUn receives passage handoff request message from Rx2 at Tout2, if then execution in step 603, otherwise execution in step 604.
The transceiver controller sendaisle of step 603:ONUn switches the transceiver controller that confirmation message is given OLT, restarts the downlink data receiving at Rx2.
The transceiver controller of step 604:OLT is not supported error protection, abandons attempting, and sends alarm.
The reception that passage switches message and passage switching confirmation message is the key that guarantees that error protection is achieved, and therefore Tout1 and Tout2 need be set rightly.Generally the time value Tout1 of timer guarantees can receive in the time that at Tout1 passage switches confirmation message greater than Tout2, and occurrence need be set according to the situation of network.
Referring to Figure 13, the embodiment of the invention provides the device of adjustment of a kind of Optical Access Network Bandwidth Dynamic and error protection, and device comprises flow detection module, downlink business shunting information module and error protection administrative message processing module;
The flow detection module is used to detect the transmittability whether the downlink business information that sends to ONUx surpasses the fixed-bandwidth down going channel of ONUx, if surpass, then the flow detection module sends flow-dividing control instruction and downlink business information to downlink business shunting information module, otherwise the flow detection module sends to downlink business shunting information module with downlink business information;
Error protection administrative message processing module is used for the failover message that receives is handled, and sends the flow-dividing control instruction to downlink business shunting information module;
After downlink business shunting information module is used to receive the flow-dividing control instruction and downlink business information that flow detection module and error protection administrative message processing module send, send after downlink business information shunted.
This device comprises that also the fixed-bandwidth down going channel sends control module, and the fixed-bandwidth down going channel sends control module and comprises control unit and transmitting element;
Control unit is used for receiving according to business information the difference of object, controls the wavelength of optical signal of corresponding generating laser;
Transmitting element is used for business information is modulated to the light signal of generating laser emission, and sends.
This device comprises that also the dynamic bandwidth down going channel sends control module, and the dynamic bandwidth down going channel sends control module and comprises control unit and transmitting element;
Control unit is used for sending according to business information the difference of priority, the wavelength of optical signal of control tunable laser;
Transmitting element is used for business information is modulated to the light signal of tunable laser emission, and sends.
Referring to Figure 14, the embodiment of the invention also provides a kind of Optical Access Network device, and device comprises fixed-bandwidth down going channel receiver module, dynamic bandwidth down going channel receiver module and uplink service sending module;
Fixed-bandwidth down going channel receiver module is used for receiving downlink business information from the fixed-bandwidth down going channel;
Dynamic bandwidth down going channel receiver module is used for breaking down or downlink business information when surpassing the transmittability of fixed-bandwidth down going channel when the fixed-bandwidth down going channel, receives downlink business information from the dynamic bandwidth down going channel;
The uplink service sending module is used to send uplink service information.
Device receives downlink business information from fixed-bandwidth down going channel and/or described dynamic bandwidth down going channel simultaneously.
Above-described embodiment is a more preferably embodiment of the present invention, and common variation that those skilled in the art carries out in the technical solution of the present invention scope and replacement all should be included in protection scope of the present invention.
Claims (12)
1. the method that the Optical Access Network Bandwidth Dynamic is adjusted is characterized in that, sets up fixed-bandwidth down going channel and dynamic bandwidth down going channel between each ONU and OLT, and carries out following steps:
Steps A: OLT detects the transmittability that the downlink business information that sends to ONUx surpasses the fixed-bandwidth down going channel of ONUx, enables the dynamic bandwidth down going channel;
Step B:OLT sends the downlink business information of the described ONUx of sending to by described fixed-bandwidth down going channel and dynamic bandwidth down going channel;
Step C:OUNx receives described downlink business information from described fixed-bandwidth down going channel and dynamic bandwidth down going channel.
2. the method that Optical Access Network Bandwidth Dynamic as claimed in claim 1 is adjusted, it is characterized in that, also comprise after the described step C: when OLT detects the downlink business information that sends to ONUx and surpasses the transmittability of fixed-bandwidth down going channel of ONUx, OLT stops the shunting to the downlink business information of described ONUx, close of the shunting of the downlink business information of described ONUx, and send control message notifying ONUx at the dynamic bandwidth down going channel.
3. the method that Optical Access Network Bandwidth Dynamic as claimed in claim 1 or 2 is adjusted is characterized in that described method step B specifically comprises:
OLT is according to the load balancing algorithm, with the downlink business information of the described ONUx of sending to share be modulated in the described fixed-bandwidth down going channel and described dynamic bandwidth down going channel in.
4. as the method for claim 1 or 2 or 3 described Optical Access Network Bandwidth Dynamic adjustment, it is characterized in that described fixed-bandwidth down going channel provides the fixed-bandwidth of monopolizing for each ONU; Described dynamic bandwidth down going channel provides the dynamic bandwidth of scheduling as required for each ONU.
5. the method for an Optical Access Network error protection is characterized in that, when the fixed-bandwidth down going channel breaks down, said method comprising the steps of:
Steps A: OLT receives alarm, enables the dynamic bandwidth down going channel;
The downlink business information that step B:OLT will send to ONUx sends by described dynamic bandwidth down going channel;
Step C:ONUx receives described downlink business information from described dynamic bandwidth down going channel.
6. the method for Optical Access Network error protection as claimed in claim 5 is characterized in that, described fixed-bandwidth down going channel breaks down and is specially reflector and breaks down.
7. the method for Optical Access Network error protection as claimed in claim 6 is characterized in that, when described reflector broke down, described method specifically comprised:
Step a:OLT receives alarm, starts tunable laser, adjusts the wavelength of described tunable laser;
Step b:OLT will originally need be modulated to by the downlink business information that the fault reflector sends in the light signal that described tunable laser launches, and the light signal after will modulating sends to ONUx;
Step c:ONUx receives light signal after the described modulation by receiver.
8. an Optical Access Network Bandwidth Dynamic is adjusted and the device of error protection, it is characterized in that described device comprises flow detection module, downlink business shunting information module and error protection administrative message processing module;
Described flow detection module is used to detect the transmittability whether the downlink business information that sends to ONUx surpasses the fixed-bandwidth down going channel of ONUx, if surpass, then described flow detection module transmission flow-dividing control instruction and downlink business information are to described downlink business shunting information module, otherwise described flow detection module sends to described downlink business shunting information module with downlink business information;
Described error protection administrative message processing module is used for the failover message that receives is handled, and sends the flow-dividing control instruction to described downlink business shunting information module;
After described downlink business shunting information module is used to receive the flow-dividing control instruction and downlink business information that described flow detection module and described error protection administrative message processing module send, send after downlink business information shunted.
9. the device of Optical Access Network Bandwidth Dynamic adjustment as claimed in claim 8 and error protection, it is characterized in that, this device comprises that also the fixed-bandwidth down going channel sends control module, and described fixed-bandwidth down going channel sends control module and comprises control unit and transmitting element;
Described control unit is used for receiving according to business information the difference of object, controls the wavelength of optical signal of corresponding generating laser;
Described transmitting element is used for business information is modulated to the light signal of described generating laser emission, and sends.
10. the device of Optical Access Network Bandwidth Dynamic adjustment as claimed in claim 8 and error protection, it is characterized in that, this device comprises that also the dynamic bandwidth down going channel sends control module, and described dynamic bandwidth down going channel sends control module and comprises control unit and transmitting element;
Described control unit is used for sending according to business information the difference of priority, the wavelength of optical signal of control tunable laser;
Described transmitting element is used for business information is modulated to the light signal of described tunable laser emission, and sends.
11. an Optical Access Network device is characterized in that, described device comprises fixed-bandwidth down going channel receiver module, dynamic bandwidth down going channel receiver module and uplink service sending module;
Described fixed-bandwidth down going channel receiver module is used for receiving downlink business information from the fixed-bandwidth down going channel;
Described dynamic bandwidth down going channel receiver module is used for breaking down or downlink business information when surpassing the transmittability of fixed-bandwidth down going channel when the fixed-bandwidth down going channel, receives downlink business information from the dynamic bandwidth down going channel;
Described uplink service sending module is used to send uplink service information.
12. Optical Access Network device as claimed in claim 11 is characterized in that, described device receives downlink business information from described fixed-bandwidth down going channel and/or described dynamic bandwidth down going channel simultaneously.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
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| CN2006101698548A CN101212255B (en) | 2006-12-29 | 2006-12-29 | Dynamic bandwidth adjustment and fault protection method and device for optical access network |
| PCT/CN2007/071366 WO2008080350A1 (en) | 2006-12-29 | 2007-12-28 | Method and device for adjusting bandwidth in optical access network dynamically and system thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2006101698548A CN101212255B (en) | 2006-12-29 | 2006-12-29 | Dynamic bandwidth adjustment and fault protection method and device for optical access network |
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| CN101212255A true CN101212255A (en) | 2008-07-02 |
| CN101212255B CN101212255B (en) | 2011-05-04 |
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| WO (1) | WO2008080350A1 (en) |
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| CN102497228A (en) * | 2011-12-08 | 2012-06-13 | 上海市共进通信技术有限公司 | Method for realizing dynamic multichannel OMCI (ONT (Optical Network Terminal) Management and Control Interface) information transmission between OLT (Optical Line Terminal) and ONU (Optical Network Unit) in PON (Passive Optical Network) system |
| CN102710999A (en) * | 2012-05-29 | 2012-10-03 | 南京邮电大学 | Method for transmitting and processing OMCI (ont management and control interface) messages in GPON (gigabit passive optical network) |
| CN103428586A (en) * | 2012-05-16 | 2013-12-04 | 中兴通讯股份有限公司 | Data transmission method and system in passive optical network system |
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| WO2017206906A1 (en) * | 2016-06-02 | 2017-12-07 | 中兴通讯股份有限公司 | Service isolation method and device |
| CN108476082A (en) * | 2016-04-07 | 2018-08-31 | 华为技术有限公司 | Selective channel control in multichannel passive optical network (PON) |
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| US6920113B1 (en) * | 2000-03-28 | 2005-07-19 | Telsima Inc. | Transport of iscochronous and bursty data on a sonet ring |
| CA2310188A1 (en) * | 2000-05-30 | 2001-11-30 | Mark J. Frazer | Communication structure with channels configured responsive to reception quality |
| CN1165187C (en) * | 2001-05-23 | 2004-09-01 | 华为技术有限公司 | Method for dynamically assigning transmission bandwidth of mobile communication satelite on demand |
| CN100452679C (en) * | 2002-12-31 | 2009-01-14 | 北京邮电大学 | Method and device for elastic protection conversion in Ethernet passive optic network system |
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| CN103428586A (en) * | 2012-05-16 | 2013-12-04 | 中兴通讯股份有限公司 | Data transmission method and system in passive optical network system |
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| CN102710999A (en) * | 2012-05-29 | 2012-10-03 | 南京邮电大学 | Method for transmitting and processing OMCI (ont management and control interface) messages in GPON (gigabit passive optical network) |
| WO2015196690A1 (en) * | 2014-06-27 | 2015-12-30 | 中兴通讯股份有限公司 | Service channel management method and device, optical transmission apparatus and computer storage medium |
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Also Published As
| Publication number | Publication date |
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| WO2008080350A1 (en) | 2008-07-10 |
| CN101212255B (en) | 2011-05-04 |
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