CN103139669A - Method and system for sending data - Google Patents
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- CN103139669A CN103139669A CN2011103744289A CN201110374428A CN103139669A CN 103139669 A CN103139669 A CN 103139669A CN 2011103744289 A CN2011103744289 A CN 2011103744289A CN 201110374428 A CN201110374428 A CN 201110374428A CN 103139669 A CN103139669 A CN 103139669A
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- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/27—Arrangements for networking
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- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/03—Arrangements for fault recovery
- H04B10/032—Arrangements for fault recovery using working and protection systems
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- H04J3/16—Time-division multiplex systems in which the time allocation to individual channels within a transmission cycle is variable, e.g. to accommodate varying complexity of signals, to vary number of channels transmitted
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- H04Q11/0062—Network aspects
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Abstract
The invention discloses a method and system for sending data. The method includes: when a main optical line terminal (OLT) is switched to a standby OLT, the standby OLT distributes upstream bandwidth for parts of or all optical network unit (ONU), the ONU with distributed upstream bandwidth sends upstream data in the upstream bandwidth distributed for the ONU, and the standby OLT and/or parts of or all ONU do or does not change a first distance measurement result before the OLT is switched. The method and system for sending data can solve the problem that the ONU cannot recover business transmission rapidly after protection switching occurs in a passive optical network (PON) system in a correlation technique.
Description
Technical field
The present invention relates to the communications field, in particular to a kind of data transmission method for uplink and system.
Background technology
Gigabit passive optical network (Gigabit-Capable Passive Optical Network, GPON) technology and Ethernet passive optical network (Ethernet Passive Optical Network, EPON) be EPON (Passive Optical Network, PON) two important technology branches in family, with other PON technology type seemingly, GPON and EPON are also the passive light access technologies that adopts point-to-multipoint topological structure.
The topological structure of PON system is by optical line terminal (the Optical Line Terminal of office's side, referred to as OLT), optical network unit (the Optical Network Unit of user's side, referred to as ONU) and Optical Distribution Network (Optical Distributio Network, referred to as ODN) form, usually adopt point-to-multipoint network configuration.ODN is comprised of Passive Optical Components such as monomode fiber, optical splitter, optical connectors, for the physical connection between OLT and ONU provides light-transmitting medium.The topological structure schematic diagram of PON system as shown in Figure 1.
In the PON system, the transfer of data of down direction (by OLT to ONU) adopts broadcast mode, each ONU receives respectively all frames, the ONU of GPON system obtains one's own frame according to ONU-ID, GEM-Port ID, Allocation-ID again, and the ONU of EPON system obtains one's own frame according to LLID, physical label.
For the transfer of data of up direction (from ONU to OLT), because each ONU need to share transmission medium, so each ONU should be in OLT arranges transmit ascending data to the time slot of oneself.Each ONU is different from distance between OLT, arrives simultaneously OLT for preventing the upstream data that each ONU sends, and OLT need to find range to the ONU that is in the registration activation stage.OLT sends to respectively corresponding ONU with the range finding result (for example balanced time delay value (EqD)) of each ONU in GPON, and ONU needs to delay time above-mentioned time corresponding to balanced time delay value before sending upstream data, and then sends upstream data.After in the EPON system, OLT completes range finding to ONU, distribute upstream bandwidth for each ONU according to the range finding result.
in order to consider reliability, the PON system provides a kind of protected mode, it is trunk optical fibre protection, as shown in Figure 2, trunk optical fiber between OLT and ODN is protected, two redundant backbones optical fiber and two corresponding redundancy OLT are provided, active and standby (also referred to as primary path and stand-by channel) each other, , trunk optical fiber and corresponding OLT (for example OLT1) normal operation, another trunk optical fiber and corresponding OLT (LOT2) are in stand-by state, protect switching when primary trunk optical fiber or primary OLT fault, standby trunk optical fiber and spare OLT become primary trunk optical fiber and primary OLT.
Due to primary OLT and the identical wavelength of the descending employing of spare OLT; in the situation that primary OLT normal operation; spare OLT can't dynamically be found range in real time to each ONU; therefore the OLT after protection is switched need to re-start range finding to each ONU and could work; required time is often longer; can't guarantee the service quality (Quality of Service, QoS) of bearer service.
Also do not have at present a kind of effective method of unifying to realize that spare OLT becomes the purpose of ONU recovery business rapidly transmission after primary OLT.
Switch the rear ONU problem transmitted of quick-recovery business soon for protection occurs in PON system in correlation technique, not yet propose at present effective solution.
Summary of the invention
Switch the rear ONU problem transmitted of quick-recovery business soon for protection occurs in PON system in correlation technique, the invention provides a kind of data transmission method for uplink and system, to address the above problem at least.
According to an aspect of the present invention, a kind of data transmission method for uplink is provided, comprise: when primary OLT switched to spare OLT, described spare OLT was that some or all of ONU distributes upstream bandwidth, and the described ONU that is assigned with upstream bandwidth sends upstream data in for the upstream bandwidth that self distributes; Wherein, described spare OLT and/or described some or all of ONU do not change OLT switching the first range finding result before.
Preferably, described spare OLT is that some or all of ONU distributes upstream bandwidth, the described ONU that is assigned with upstream bandwidth sends upstream data in for the upstream bandwidth that self distributes, comprise: when primary OLT switched to spare OLT, described spare OLT was that described part or all of ONU distributes upstream bandwidth; The ONU that is assigned with upstream bandwidth sends upstream data according to described primary OLT in the first range finding result that master channel distributes in for the upstream bandwidth that distributes separately; Perhaps, when described primary OLT switched to described spare OLT, described spare OLT distributed upstream bandwidth for described part or all of ONU at described master channel to the first range finding result of each ONU according to described primary OLT; The ONU that is assigned with upstream bandwidth sends described upstream data in for the upstream bandwidth that distributes separately.
Preferably, the process of transmitting of described upstream data also comprises: described spare OLT is obtained the ONU that respectively is assigned with upstream bandwidth in the second range finding result of alternate channel; Described spare OLT continue according to described the second range finding result and the described ONU that is assigned with upstream bandwidth between carry out the transmission of described upstream data.
Preferably, described spare OLT is obtained the described ONU of upstream bandwidth that is assigned with in the second range finding result of alternate channel, comprise: described spare OLT is obtained the described range finding difference of ONU between described master channel and described alternate channel that is assigned with upstream bandwidth, obtains described the second range finding result according to described range finding difference and described the first range finding result; Perhaps described spare OLT receives the described uplink frame that is assigned with the ONU transmission of upstream bandwidth, directly calculates described the second range finding result.
Preferably, the type of described the first range finding result and described the second range finding result comprises: balanced time delay value EqD, loop time delay value RTD or loop time RTT.
Preferably, described spare OLT is obtained the described range finding difference of ONU between described master channel and described alternate channel that is assigned with upstream bandwidth, comprise: described spare OLT calculate the time value of the actual arrival of upstream data that the described ONU that is assigned with upstream bandwidth sends and described spare OLT wish the described ONU transmission that is assigned with upstream bandwidth upstream data the time of advent value difference, the difference of getting this of value is described range finding difference time of advent; Perhaps, described spare OLT is measured the described ONU of upstream bandwidth that is assigned with at the distance measurement value of described stand-by channel, calculate the described ONU that is assigned with upstream bandwidth in the difference of the distance measurement value of the distance measurement value of described primary path and described stand-by channel, the difference of getting this distance measurement value is described range finding difference.
Preferably, described spare OLT continue according to described the second range finding result and the described ONU that is assigned with upstream bandwidth between carry out the send and receive of described upstream data, comprise: described spare OLT sends to the ONU corresponding with this second range finding result with each second range finding result, wherein, the ONU of described correspondence upgrades the distance measurement value of self according to this second range finding result; Described spare OLT is that the ONU of described correspondence distributes upstream bandwidth again, and the ONU of described correspondence adopts the distance measurement value after upgrading to send described upstream data; Perhaps described spare OLT judges the time of advent of described upstream data according to described the second range finding result, and according to receiving described upstream data the described time of advent.
Preferably, after described spare OLT and the described ONU that is assigned with upstream bandwidth set up and communicate by letter, described spare OLT is obtained described the second range finding result by following method one of arbitrarily: described spare OLT is found range again to the described ONU that is assigned with upstream bandwidth, obtains described the second range finding result; Described spare OLT and the described mutual specify message of ONU that is assigned with upstream bandwidth are obtained described the second range finding result.
Preferably, described specify message comprise following one of at least: physical layer operations management maintenance PLOAM message, ONU management control interface OMCI message and gigabit method for packing GEM frame.
Preferably, described primary OLT switches to after spare OLT or before, also comprise: described spare OLT is obtained the identification information of described part or all of ONU as follows: described spare OLT receives the described identification information that described primary OLT sends; Perhaps described spare OLT is monitored the uplink frame that described part or all of ONU sends, and obtains described identification information.
Preferably, described identification information comprise following one of at least: ONU-ID, MAC Address, sequence number information, LLID, balanced time delay value, loop time delay value, loop time, transmission container and gigabit method for packing port-mark.
Preferably, described primary OLT also comprises before switching to spare OLT: the configuration Profile information of the corresponding alternate channel of described primary OLT broadcasting.
Preferably, described spare OLT is that the upstream bandwidth that part or all of ONU distributes comprises: described spare OLT is that the guard time guard time between the upstream bandwidth that distributes of described part or all of ONU is guard time between the upstream bandwidth that distributes of described part or all of ONU greater than described primary OLT.
Preferably, described spare OLT is after part or all of ONU distributes upstream bandwidth, also to comprise: the uplink frame that the synchronous described part or all of ONU of described spare OLT sends.
Preferably, after described spare OLT is given part or all of ONU distribution upstream bandwidth, also comprise: if in the described ONU that is assigned with upstream bandwidth partly or entirely ONU get back to initial condition, get back to the ONU of initial condition again through entering operating state after registration activation.
According to a further aspect in the invention, provide a kind of data transmission system, comprised spare OLT and ONU: described spare OLT when switching to spare OLT for primary OLT, is that some or all of ONU distributes upstream bandwidth; The described ONU that is assigned with upstream bandwidth is used for sending upstream data in for the upstream bandwidth that self distributes, and wherein, described spare OLT and/or described some or all of ONU do not change the first range finding result before the OLT switching.
Preferably, described spare OLT also is used for when primary OLT switches to described spare OLT, for part or all of ONU distributes upstream bandwidth; Be assigned with the ONU of upstream bandwidth, also being used for is being to send upstream data according to described primary OLT in the first range finding result that master channel distributes in the upstream bandwidth that distributes separately; Perhaps described spare OLT, also be used for when described primary OLT switches to described spare OLT, distributes upstream bandwidth for described part or all of ONU at described master channel to the first range finding result of each ONU according to described primary OLT; Be assigned with the ONU of upstream bandwidth, also being used for is being to send described upstream data in the upstream bandwidth that distributes separately.
In embodiments of the present invention, when primary OLT switched to spare OLT, spare OLT was that some or all of ONU distributes upstream bandwidth, and the ONU that is assigned with upstream bandwidth sends upstream data in for the upstream bandwidth that self distributes; Wherein, spare OLT and/or some or all of ONU do not change OLT switching the first range finding result before.Namely, in embodiments of the present invention, primary OLT can not be with after ONU communicates by letter, when active and standby OLT switches, spare OLT and part or all of ONU do not change the first range finding result before the OLT switching, do not need each ONU is re-started range finding, send upstream data but continue the primary OLT of use in the first range finding result of master channel distribution, make the spare OLT required time that works be shortened, guarantee the QoS of bearer service.
Description of drawings
Accompanying drawing described herein is used to provide a further understanding of the present invention, consists of the application's a part, and illustrative examples of the present invention and explanation thereof are used for explaining the present invention, do not consist of improper restriction of the present invention.In the accompanying drawings:
Fig. 1 is the composition structure chart according to the EPON of correlation technique;
Fig. 2 is the trunk optical fibre protection structural representation according to the EPON protected mode Types Below B of correlation technique;
Fig. 3 is the first process chart according to the data transmission method for uplink of the embodiment of the present invention;
Fig. 4 is the second process chart according to the data transmission method for uplink of the embodiment of the present invention;
Fig. 5 is the structural representation according to the data Transmission system of the embodiment of the present invention.
Embodiment
Hereinafter also describe in conjunction with the embodiments the present invention in detail with reference to accompanying drawing.Need to prove, in the situation that do not conflict, embodiment and the feature in embodiment in the application can make up mutually.
Mention in correlation technique; due to primary OLT and the identical wavelength of the descending employing of spare OLT; in the situation that primary OLT normal operation; spare OLT can't dynamically be found range in real time to each ONU; therefore the OLT after protection is switched need to re-start range finding to each ONU and could work; required time is often longer, can't guarantee the QoS of bearer service.
For solving the problems of the technologies described above, the embodiment of the present invention provides a kind of data transmission method for uplink, its handling process is as follows: when primary OLT switches to spare OLT, spare OLT is that some or all of ONU distributes upstream bandwidth, and the ONU that is assigned with upstream bandwidth sends upstream data in for the upstream bandwidth that self distributes; Wherein, spare OLT and/or some or all of ONU do not change OLT switching the first range finding result before.
In embodiments of the present invention, when primary OLT switched to spare OLT, spare OLT was that some or all of ONU distributes upstream bandwidth, and the ONU that is assigned with upstream bandwidth sends upstream data in for the upstream bandwidth that self distributes; Wherein, spare OLT and/or some or all of ONU do not change OLT switching the first range finding result before.Namely, in embodiments of the present invention, primary OLT can not be with after ONU communicates by letter, when active and standby OLT switches, spare OLT and part or all of ONU do not change the first range finding result before the OLT switching, do not need each ONU is re-started range finding, send upstream data but continue the primary OLT of use in the first range finding result of master channel distribution, make the spare OLT required time that works be shortened, guarantee the QoS of bearer service.
The alternate channel both sides relate separately to spare OLT and ONU, and therefore, the application main body of the first ranging data can be spare OLT, can be also ONU, is specifically described according to the main body difference.
Describe take ONU as main body, the embodiment of the present invention provides a kind of data transmission method for uplink, and its handling process comprises that step S302 is to step S304 as shown in Figure 3:
Step S302, when primary OLT switches to spare OLT, spare OLT is that part or all of ONU distributes upstream bandwidth;
Step S304, the ONU that is assigned with upstream bandwidth send upstream data according to primary OLT in the first range finding result that master channel distributes in for the upstream bandwidth that distributes separately.
In embodiments of the present invention, when primary OLT switches to spare OLT, spare OLT is that part or all of ONU distributes upstream bandwidth, and the ONU that is assigned with upstream bandwidth sends upstream data according to primary OLT in the first range finding result that master channel distributes in for the upstream bandwidth that distributes separately.Namely, in embodiments of the present invention, primary OLT can not be with after ONU communicates by letter, when active and standby OLT switches, spare OLT does not need each ONU is re-started range finding, but is directly that part or all of ONU distributes upstream bandwidth, and ONU continues to use primary OLT to send upstream data in the first range finding result that master channel distributes, make the spare OLT required time that works be shortened, guarantee the QoS of bearer service.
Based on same inventive concept, corresponding with method shown in Figure 3, the embodiment of the present invention also provides a kind of data transmission method for uplink, describes take spare OLT as main body, and its structural representation comprises that step S402 is to step S404 as shown in Figure 4:
Step S402, when primary OLT switches to spare OLT, spare OLT distributes upstream bandwidth for part or all of ONU at master channel to the first range finding result of each ONU according to primary OLT;
Step S404, the ONU that is assigned with upstream bandwidth send upstream data in for the upstream bandwidth that distributes separately.
In embodiments of the present invention, when primary OLT switches to spare OLT, spare OLT distributes upstream bandwidth for part or all of ONU at master channel to the first range finding result of each ONU according to primary OLT, and the ONU that is assigned with upstream bandwidth sends upstream data in for the upstream bandwidth that distributes separately.Namely, in embodiments of the present invention, primary OLT can not be with after ONU communicates by letter, when active and standby OLT switches, spare OLT does not need each ONU is re-started range finding, is that part or all of ONU distributes upstream bandwidth but directly utilize primary OLT in the first range finding result that master channel distributes, and ONU sends upstream data in the upstream bandwidth that distributes, make the spare OLT required time that works be shortened, guarantee the QoS of bearer service.
The process of transmitting of the upstream data of putting down in writing in Fig. 3 and Fig. 4, spare OLT is to use upstream bandwidth that the first measurement result that primary OLT records on master channel is carried out to distribute or ONU utilizes the upstream data that the first measurement result is carried out to send, namely, its associative operation or application are all to depend on the first measurement result, that is to say the data that depend on master channel.Master channel and alternate channel self possess otherness, and for example, the length of master channel and alternate channel is different, and therefore, there is certain difference in the time that upstream data arrives spare OLT and primary OLT.Arrive the correct time value of spare OLT for obtaining upstream data that ONU sends, in the upstream data process of transmitting, spare OLT is obtained the ONU that respectively is assigned with upstream bandwidth in the second range finding result of alternate channel; Spare OLT continues according to the second range finding result and is assigned with the sending and receiving that carries out upstream data between the ONU of upstream bandwidth.
Wherein, spare OLT is obtained the ONU that is assigned with in the second range finding result of alternate channel, can adopt following any one execution mode:
The first, spare OLT are obtained the range finding difference of ONU between master channel and alternate channel that is assigned with upstream bandwidth, obtain the second range finding result according to range finding difference and the first range finding result;
The second, spare OLT receive the uplink frame of the ONU transmission that is assigned with upstream bandwidth, directly calculate the second range finding result.
Concrete, the type of the first range finding result and the second range finding result can comprise: balanced time delay value (EqD), loop time delay value (RTD) or loop time (RTT).Certainly, when implementing, the range finding result can also adopt other types, can embody the range finding result and get final product.Now as an example of above-mentioned several types example, the computational methods of range finding difference are elaborated.
Embodiment one
The time value that spare OLT is calculated actual arrivals of upstream data that the ONU be assigned with upstream bandwidth sends and spare OLT wish to be assigned with upstream bandwidth the ONU transmission upstream data the time of advent value difference, the difference of getting this of value is the difference of finding range time of advent.
Embodiment two
The spare OLT measurement is assigned with the ONU of upstream bandwidth at the distance measurement value of stand-by channel, calculates the ONU be assigned with upstream bandwidth in the difference of the distance measurement value of the distance measurement value of primary path and stand-by channel, and the difference of getting this range finding is the range finding difference.
After the range finding difference was determined, spare OLT can send to ONU with the range finding difference, and ONU namely can determine the second range finding result according to find range difference and the first range finding result, and then carries out the upstream data transmission according to the second range finding result on the upstream bandwidth that distributes.Perhaps, spare OLT is determined the second range finding result according to range finding difference and the first range finding result, is that ONU distributes upstream bandwidth according to the second range finding result.
Perhaps, spare OLT can also send to each the second range finding result the ONU corresponding with this second range finding result, and wherein, corresponding ONU upgrades the distance measurement value of self according to this second range finding result; Spare OLT is that corresponding ONU distributes upstream bandwidth again, and corresponding ONU adopts the distance measurement value after upgrading to send upstream data.
Perhaps, spare OLT can also not informed ONU with the second range finding result, but self judges the time of advent of upstream data according to the second range finding result, and according to receiving upstream data this time of advent.
In a preferred embodiment, after spare OLT and the ONU that is assigned with upstream bandwidth set up and communicate by letter, spare OLT was obtained second result of finding range by following method one of arbitrarily:
The first, spare OLT is found range again to the ONU that is assigned with upstream bandwidth, obtains the second range finding result;
The second, spare OLT is obtained the second range finding result with the mutual specify message of ONU that is assigned with upstream bandwidth.
Wherein, in second method, specify message can be for multiple, and is preferred, comprise following one of at least: PLOAM message, OMCI message and GEM frame.
During enforcement, after primary OLT switches to spare OLT or before, for allow spare OLT can with ONU between set up and communicate by letter, spare OLT need to be obtained the identification information of ONU, its obtain manner that relates to can have multiple, preferably, can comprise: spare OLT receives the identification information that primary OLT sends; Perhaps, spare OLT is monitored the uplink frame that part or all of ONU sends, and obtains identification information.Wherein, identification information comprise following one of at least: ONU-ID, MAC Address, sequence number information, LLID, balanced time delay value, loop time delay value, loop time, transmission container and gigabit method for packing port-mark.
If adopt spare OLT to monitor the method for the uplink frame that part or all of ONU sends, spare OLT can be monitored the identification information that following part in uplink frame or full content obtain ONU: PLOAM message, OMCI message and GEM frame.
In embodiments of the present invention, before primary OLT switches to spare OLT, can know the configuration Profile information of corresponding stand-by channel for guaranteeing ONU, the Profile information of the corresponding alternate channel of primary OLT broadcasting is informed ONU with the relevant information of alternate channel.
In implementation process, spare OLT is that the upstream bandwidth that part or all of ONU distributes possesses following characteristic: spare OLT is that the guard time between the upstream bandwidth that distributes of part or all of ONU is guard time between the upstream bandwidth that distributes of part or all of ONU greater than primary OLT.ONU sends upstream data in possessing the upstream bandwidth of this characteristic, avoid uplink frame to reach simultaneously spare OLT, further guarantees the QoS of bearer service.
In a preferred embodiment, spare OLT is after part or all of ONU distributes upstream bandwidth, and spare OLT is sync section or whole uplink frame of ONU transmissions directly.
Certainly, after spare OLT was given part or all of ONU distribution upstream bandwidth, partly or entirely ONU was owing to switching OLT and communication port, login state may appear withdrawing from, namely reply initial condition, at this moment, should will get back to the ONU of initial condition again through entering operating state after registration activation.
To set forth ground clearer clearer for data transmission method for uplink that the embodiment of the present invention is provided, now is described with several specific embodiments.
Embodiment three
The present embodiment is elaborated to the data sending method.
Steps A, ONU-ID preparation method
Primary OLT sends to spare OLT with following part or the full detail of ONU: ONU-ID, MAC Address, sequence number information, LLID, balanced time delay value, loop time delay value, loop time, transmission container, gigabit method for packing port-mark, perhaps spare OLT is monitored the uplink frame that ONU sends, obtain above-mentioned some or all of information, specifically pass through following manner: spare OLT is monitored PLOAM message, OMCI message and/or GEM frame acquisition ONU-ID, the range finding result that ONU sends.Spare OLT is monitored the uplink frame that ONU sends, spare OLT is monitored the uplink frame that ONU sends to main OLT, and spare OLT obtains following part or full detail: ONU-ID, MAC Address, sequence number information, LLID, balanced time delay value, loop time delay value, loop time, transmission container, gigabit method for packing port-mark by the PLOAM message in this uplink frame, OMCI message and/or GEM frame.
Step B, reuse EqD:
Primary OLT can not be with after ONU communicates by letter; spare OLT distributes upstream bandwidth for some or all of ONU, and the guard time (guard time) between the upstream bandwidth that spare OLT is distributed to ONU is greater than the guard time between the upstream bandwidth that distributes to ONU than primary OLT.The range finding result that above-mentioned ONU distributes according to primary OLT in above-mentioned upstream bandwidth sends upstream data, and perhaps spare OLT is distributed upstream bandwidth to the range finding result of ONU to ONU according to primary OLT, and ONU sends upstream data in above-mentioned upstream bandwidth.
Step C, primary channel EqD difference or RTT, EqD preparation method
Spare OLT uplink synchronization frame, after namely spare OLT was distributed upstream bandwidth to ONU, spare OLT began the uplink synchronization frame.Spare OLT obtains according to the difference of the time of advent that time and the spare OLT of the actual arrival of upstream data of ONU transmission are wished the upstream data that above-mentioned ONU sends the range finding difference that the ONU needs in step B are adjusted, perhaps, spare OLT records in the RTD of primary path value and spare OLT the range finding difference that this ONU adjusts at the above-mentioned ONU needs of the difference acquisition of the RTD of stand-by channel value according to this ONU, after perhaps OLT distributes bandwidth to the range finding result of ONU to ONU according to primary OLT, directly calculate ONU at the distance measurement value of alternate channel when receiving the uplink frame of ONU.
Step D, spare OLT are calculated the range finding result and are sent to ONU, and ONU upgrades EqD
After the range finding difference that the spare OLT above-mentioned ONU distance measurement value of calculating or above-mentioned ONU need to adjust, the range finding difference that above-mentioned distance measurement value or above-mentioned ONU need to be adjusted sends to corresponding ONU, after ONU receives the above-mentioned information of spare OLT transmission, upgrade the distance measurement value of oneself, and adopt new distance measurement value to send upstream data after again receiving the upstream bandwidth that spare OLT is distributed.
After step e, spare OLT and ONU set up and communicate by letter, OLT can be by the range finding end value of one of following method acquisition ONU at stand-by channel:
Method one: OLT finds range again to ONU, obtains the range finding end value of ONU;
Method two: OLT is by obtaining the range finding end value of ONU with the mutual PLOAM message of ONU, OMCI message or GEM frame.
Step F, primary OLT can not be with after ONU communicate by letter, and spare OLT distributes upstream bandwidth for some or all of ONU, if wherein some or all of ONU gets back to initial condition, gets back to the ONU of initial condition again through entering operating state after registration activation.
In the present embodiment, the range finding result is balanced time delay value, loop time delay value or loop time.
The method that adopts the embodiment of the present invention to provide, when ONU transfers to another OLT from an OLT, the quick-recovery business is transmitted soon, the service quality of raising network.
Example four (GPON mechanism)
As shown in Figure 2; in the topological structure of the EPON of protecting the trunk optical fiber mode; first optical line terminal OLT 1 is primary path by the path that optical splitter arrives ONU, and second optical line terminal OLT 2 is stand-by channel by the path that optical splitter arrives ONU.OLT1 sends to OLT2 (also can adopt in other embodiments primary OLT that following part or the full detail of ONU are sent to spare OLT: ONU-ID the ONU identification information (ONU-ID) of the ONU of its management, sequence number information, balanced time delay value, the loop time delay value, transmission container, gigabit method for packing port-mark, vlan information), perhaps OLT2 monitoring ONU sends to the uplink frame acquisition ONU identification information of OLT1 (also can adopt in other embodiments OLT2 to monitor the uplink frame that ONU sends to OLT1, obtain following part or full detail: ONU-ID, sequence number information, balanced time delay value, the loop time delay value, transmission container, gigabit method for packing port-mark.OLT2 monitors the uplink frame that ONU sends to OLT1, and OLT2 obtains above-mentioned some or all of information by the PLOAM message in this uplink frame, OMCI message and/or GEM frame).In primary path road during the configuration information corresponding different with alternate channel, the Profile information of the primary OLT corresponding primary path of broadcasting and alternate channel.
Primary path is as the service path of optical network unit and optical line terminal, and after primary path interrupt or primary OLT broke down, ONU entered into downstream signal lost condition (O6 state), enables stand-by channel and OLT2 and manages all ONU.Spare OLT sends downlink frame, enters operating state (O5) after part or all ONU complete downlink frame synchronization; Perhaps spare OLT sends direct POU-UP message (directed POP-UP messages) for part or all ONU, the ONU of O6 state enters the O5 state after receiving POP-UP message, and ONU and OLT2 adopt following step to complete the renewal of balanced time delay (EqD) value of ONU:
Step 1:OLT2 distributes upstream bandwidth for each ONU, the guard time between the upstream bandwidth that the guard time (guard time) between the upstream bandwidth that OLT2 distributes to ONU distributes to ONU greater than OLT1, corresponding leading longer of above-mentioned upstream bandwidth;
Step 2: each ONU sends upstream data with the balanced time delay EqD1 of corresponding OLT1 to OLT2 in OLT2 gives the upstream bandwidth of own distribution.
Step 3:OLT2 begins the uplink frame that synchronous ONU sends, and after the uplink frame that the synchronous ONU of OLT success sends, OLT calculates by one of following dual mode the balanced time delay adjusted value Δ EqD that ONU need to adjust:
Mode one: Δ EqD=ONU uplink frame the actual time of arrival-expected approach time of ONU uplink frame;
Mode two: OLT calculates ONU at the RTD of stand-by channel value RTD2, and calculating Δ EqD=RTD1-RTD2 (value of RTD1 is that OLT1 sends to OLT2 or OLT2 monitoring ONU to send to the uplink frame of OLT1 to obtain this content), wherein, RTD1 be this ONU in the RTD of primary path value, RTD2 is that this ONU is in the RTD of stand-by channel value.
OLT2 sends to all ONU with balanced time delay adjusted value Δ EqD;
Step 4: after each ONU receives the Δ EqD value of OLT2 transmission, upgrade the value of the EqD of oneself, namely be updated to the balanced time delay value EqD2 corresponding with OLT2:
EqD2＝EqD1-ΔEqD。
Step 5:OLT2 distributes upstream bandwidth to the ONU of the balanced time delay of renewal, and OLT2 equals OLT1 to the guard time between the upstream bandwidth of ONU distribution to the guard time (guard time) between the upstream bandwidth of two ONU distribution of all completing to upgrade balanced time delay; ONU receives the upstream bandwidth that OLT2 distributes, and sends upstream data according to the balanced time delay EqD2 after upgrading synchronous to realize upstream data.
In the present embodiment, after step 5, OLT can obtain ONU in the EqD of stand-by channel value by one of following method as required:
Method one: OLT finds range again to ONU, obtains the range finding end value of ONU;
Method two: OLT is by obtaining the range finding end value of ONU with the mutual PLOAM message of ONU, OMCI message or GEM frame.
OLT can select above-mentioned EqD value is sent to corresponding ONU after obtaining the EqD value of ONU as required.
In the present embodiment, in step 1, if wherein some or all of ONU gets back to initial condition, the described ONU of initial condition that gets back to is again through entering operating state after registration activation.
In the present embodiment, OLT2 sends to ONU with the difference of the EqD that ONU need to adjust, in other embodiment, also can adopt following method: OLT1 that the EqD1 of all ONU is sent to OLT2, OLT2 calculates Δ EqD according to the method described above, and then calculating EqD2=EqD1-Δ EqD, OLT2 sends to all ONU with the EqD2 of each ONU.
In the present embodiment, OLT2 sends to ONU with the difference of the EqD that ONU need to adjust, in other embodiment, also can only adopt following step to recover the communication of ONU:
Step 1:OLT2 distributes upstream bandwidth for each ONU, and the guard time (guard time) between the upstream bandwidth that OLT2 distributes to ONU is greater than the guard time between the upstream bandwidth that distributes to ONU than OLT1, corresponding leading longer of above-mentioned upstream bandwidth;
Step 2: each ONU sends upstream data with the balanced time delay EqD1 of corresponding OLT1 to OLT2 in OLT2 gives the upstream bandwidth of own distribution.
Step 3:OLT2 begins the uplink frame that synchronous ONU sends.
In above-mentioned steps 3, also can adopt following method: OLT2 to begin the uplink frame that synchronous ONU sends, after the optical module that is specially OLT2 detects uplink optical signal, send immediately reset signal uplink synchronization data.
Switch in protection the EqD that rear ONU continues to use the OLT1 distribution occurs; do not need to adjust the value of EqD; OLT2 is synchronized to the uplink frame of ONU transmission in step 3 after; OLT2 obtains the actual time of arrival that ONU sends uplink frame; OLT2 can estimate the next actual time of arrival value of the upstream data of all ONU according to above-mentioned information, and according to this time reception upstream data.
In the present embodiment; after generation is switched in protection; OLT2 directly distributes upstream bandwidth to ONU; in other embodiment; also can adopt OLT2 at first to send up expense (upstream_overhead) message to ONU; preamble word joint number in above-mentioned upstream_overhead message is longer; ONU receives and stores above-mentioned upstream_overhead message; then OLT distributes upstream bandwidth to ONU, the leading leading value for carrying in above-mentioned upstream_overhead message in the uplink burst that ONU sends in distributing to the upstream bandwidth of oneself.
In the present embodiment; after generation was switched in protection, the uplink frame that the synchronous ONU of OLT2 sends also can adopt before generation is switched in protection in other embodiment; OLT1 and OLT2 complete ONU in the range finding of stand-by channel, and OLT2 preserves ONU in the range finding result of stand-by channel.After generation was switched in protection, after OLT2 distributed upstream bandwidth to ONU, OLT2 can directly receive uplink frame according to prior art.
Example five (EPON mechanism)
As shown in Figure 2; in the topological structure of the EPON of protecting the trunk optical fiber mode; first optical line terminal OLT 1 is primary path by the path that optical splitter arrives ONU, and second optical line terminal OLT 2 is stand-by channel by the path that optical splitter arrives ONU.
OLT1 sends to OLT2 (also can adopt in other embodiments OLT1 that following part or the full detail of ONU are sent to OLT2:LLID, MAC Address, loop time value, vlan information) with the ONU LLID (LLID) of the ONU of its management, perhaps OLT2 monitoring ONU sends to the LLID of the uplink frame acquisition ONU of OLT1 (also can adopt in other embodiments OLT2 to monitor the uplink frame that ONU sends to OLT1, obtain following part or full detail: LLID, MAC Address, loop time value, vlan information.OLT2 monitors the uplink frame that ONU sends to OLT1, and OLT2 is by the above-mentioned some or all of information of acquisition such as other partial contents of eOAM message, OMCI message or uplink frame in this uplink frame).
Primary path is as the service path of optical network unit and optical line terminal, after primary path interrupt or primary OLT break down, enables stand-by channel and OLT2 and manages all ONU.OLT1 before OLT2 management ONU, with all ONU the range finding of primary path as a result loop time value RTT1 send to OLT2, OLT2 stores above-mentioned information.
ONU adopts following step to set up with OLT2 and communicates by letter:
Step 1:OLT2 distributes upstream bandwidth for each ONU according to the RTT1 of each ONU, and the guard time between the upstream bandwidth that distributes to ONU greater than OLT1 of the guard time (guard time) between the upstream bandwidth that distributes to ONU of OLT2;
Step 2: each ONU sends upstream data in OLT2 gives the upstream bandwidth that oneself distributes.
Step 3:OLT2 begins the uplink frame that synchronous ONU sends, and after the uplink frame that the synchronous ONU of OLT success sends, OLT calculates ONU at the RTT of stand-by channel by one of following dual mode:
Mode one: Δ RTT=ONU uplink frame the actual time of arrival-expected approach time of ONU uplink frame, it is RTT2=RTT1-Δ RTT in the RTT2 of alternate channel value that OLT2 calculates ONU;
Mode two: OLT calculates ONU in the RTT of stand-by channel value.
OLT2 distributes upstream bandwidth for each ONU according to the RTT2 of each ONU.
In the present embodiment, after step 3, OLT can find range again to ONU as required, obtains the range finding end value RTT of ONU, and distributes upstream bandwidth according to above-mentioned RTT value to ONU.
In the present embodiment, in step 1, if wherein some or all of ONU gets back to initial condition, the described ONU of initial condition that gets back to is again through entering operating state after registration activation.
In the present embodiment, OLT2 calculates ONU in the RTT2 of alternate channel value, in other embodiment, also can only adopt following step to recover the communication of ONU:
ONU adopts following step to set up with OLT2 and communicates by letter:
Step 1:OLT2 distributes upstream bandwidth for each ONU according to the RTT1 of each ONU, and the guard time (guard time) between the upstream bandwidth that distributes to ONU of OLT2 is greater than the guard time between the upstream bandwidth that distributes to ONU than OLT1;
Step 2: each ONU sends upstream data in OLT2 gives the upstream bandwidth that oneself distributes.
Step 3:OLT2 begins the uplink frame that synchronous ONU sends.
Based on same inventive concept, the embodiment of the present invention also provides a kind of data transmission system, and its structural representation comprises spare OLT 501 and ONU 502 as shown in Figure 5:
Be assigned with the ONU 502 of upstream bandwidth, with spare OLT 501 couplings, be used for sending upstream data in for the upstream bandwidth that self distributes, wherein, spare OLT 501 and/or some or all of ONU 502 do not change the first range finding result before the OLT switching.
In a preferred embodiment, spare OLT 501 can also be used for when primary OLT switches to spare OLT 501, for part or all of ONU 502 distributes upstream bandwidths;
Be assigned with the ONU 502 of upstream bandwidth, with spare OLT 501 couplings, can also be used for is being to send upstream data according to primary OLT in the first range finding result that master channel distributes in the upstream bandwidth that distributes separately; Perhaps
Be assigned with the ONU 502 of upstream bandwidth, with spare OLT 501 couplings, can also be used for sending upstream data in for the upstream bandwidth that distributes separately.
As can be seen from the above description, the present invention has realized following technique effect:
In embodiments of the present invention, when primary OLT switches to spare OLT, spare OLT is that part or all of ONU distributes upstream bandwidth, and the ONU that is assigned with upstream bandwidth sends upstream data according to primary OLT in the first range finding result that master channel distributes in for the upstream bandwidth that distributes separately.Namely, in embodiments of the present invention, primary OLT can not be with after ONU communicates by letter, when active and standby OLT switches, spare OLT does not need each ONU is re-started range finding, but is directly that part or all of ONU distributes upstream bandwidth, and ONU continues to use primary OLT to send upstream data in the first range finding result that master channel distributes, make the spare OLT required time that works be shortened, guarantee the QoS of bearer service.
In embodiments of the present invention, when primary OLT switched to spare OLT, spare OLT was that some or all of ONU distributes upstream bandwidth, and the ONU that is assigned with upstream bandwidth sends upstream data in for the upstream bandwidth that self distributes; Wherein, spare OLT and/or some or all of ONU do not change OLT switching the first range finding result before.Namely, in embodiments of the present invention, primary OLT can not be with after ONU communicates by letter, when active and standby OLT switches, spare OLT and part or all of ONU do not change the first range finding result before the OLT switching, do not need each ONU is re-started range finding, send upstream data but continue the primary OLT of use in the first range finding result of master channel distribution, make the spare OLT required time that works be shortened, guarantee the QoS of bearer service.
obviously, those skilled in the art should be understood that, above-mentioned each module of the present invention or each step can realize with general calculation element, they can concentrate on single calculation element, perhaps be distributed on the network that a plurality of calculation elements form, alternatively, they can be realized with the executable program code of calculation element, thereby, they can be stored in storage device and be carried out by calculation element, and in some cases, can carry out step shown or that describe with the order that is different from herein, perhaps they are made into respectively each integrated circuit modules, perhaps a plurality of modules in them or step being made into the single integrated circuit module realizes.Like this, the present invention is not restricted to any specific hardware and software combination.
The above is only 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 modifications and variations.Within the spirit and principles in the present invention all, any modification of doing, be equal to replacement, improvement etc., within all should being included in protection scope of the present invention.
Claims (17)
1. a data transmission method for uplink, is characterized in that, comprising:
When primary OLT switched to spare OLT, described spare OLT was that some or all of ONU distributes upstream bandwidth, and the ONU that is assigned with upstream bandwidth sends upstream data in for the upstream bandwidth that self distributes;
Wherein, described spare OLT and/or described some or all of ONU do not change OLT switching the first range finding result before.
2. method according to claim 1, is characterized in that, described spare OLT is that some or all of ONU distributes upstream bandwidth, and the ONU that is assigned with upstream bandwidth sends upstream data in for the upstream bandwidth that self distributes, comprising:
When primary OLT switched to spare OLT, described spare OLT was that described part or all of ONU distributes upstream bandwidth;
The ONU that is assigned with upstream bandwidth sends upstream data according to described primary OLT in the first range finding result that master channel distributes in for the upstream bandwidth that distributes separately; Perhaps,
When described primary OLT switched to described spare OLT, described spare OLT distributed upstream bandwidth for described part or all of ONU at described master channel to the first range finding result of each ONU according to described primary OLT;
The ONU that is assigned with upstream bandwidth sends described upstream data in for the upstream bandwidth that distributes separately.
3. method according to claim 2, is characterized in that, the process of transmitting of described upstream data also comprises:
Described spare OLT is obtained the ONU that respectively is assigned with upstream bandwidth in the second range finding result of alternate channel;
Described spare OLT continue according to described the second range finding result and the described ONU that is assigned with upstream bandwidth between carry out the transmission of described upstream data.
4. method according to claim 3, is characterized in that, described spare OLT is obtained the described ONU of upstream bandwidth that is assigned with in the second range finding result of alternate channel, comprising:
Described spare OLT is obtained the described range finding difference of ONU between described master channel and described alternate channel that is assigned with upstream bandwidth, obtains described the second range finding result according to described range finding difference and described the first range finding result; Perhaps
Described spare OLT receives the described uplink frame that is assigned with the ONU transmission of upstream bandwidth, directly calculates described the second range finding result.
5. method according to claim 4, is characterized in that, the type of described the first range finding result and described the second range finding result comprises: balanced time delay value EqD, loop time delay value RTD or loop time RTT.
6. method according to claim 4, is characterized in that, described spare OLT is obtained the described range finding difference of ONU between described master channel and described alternate channel that is assigned with upstream bandwidth, comprising:
Described spare OLT calculate the time value of the actual arrival of upstream data that the described ONU that is assigned with upstream bandwidth sends and described spare OLT wish the described ONU transmission that is assigned with upstream bandwidth upstream data the time of advent value difference, the difference of getting this of value is described range finding difference time of advent; Perhaps,
Described spare OLT is measured the described ONU of upstream bandwidth that is assigned with at the distance measurement value of described stand-by channel, calculate the described ONU that is assigned with upstream bandwidth in the difference of the distance measurement value of the distance measurement value of described primary path and described stand-by channel, the difference of getting this distance measurement value is described range finding difference.
7. the described method of according to claim 4 to 6 any one, is characterized in that, described spare OLT continue according to described the second range finding result and the described ONU that is assigned with upstream bandwidth between carry out the send and receive of described upstream data, comprising:
Described spare OLT sends to the ONU corresponding with this second range finding result with each second range finding result, and wherein, the ONU of described correspondence upgrades the distance measurement value of self according to this second range finding result;
Described spare OLT is that the ONU of described correspondence distributes upstream bandwidth again, and the ONU of described correspondence adopts the distance measurement value after upgrading to send described upstream data; Perhaps
Described spare OLT judges the time of advent of described upstream data according to described the second range finding result, and according to receiving described upstream data the described time of advent.
8. the described method of according to claim 3 to 6 any one, is characterized in that, after described spare OLT and the described ONU that is assigned with upstream bandwidth set up and communicate by letter, described spare OLT was obtained described second result of finding range by following method one of arbitrarily:
Described spare OLT is found range again to the described ONU that is assigned with upstream bandwidth, obtains described the second range finding result;
Described spare OLT and the described mutual specify message of ONU that is assigned with upstream bandwidth are obtained described the second range finding result.
9. method according to claim 8, is characterized in that, described specify message comprise following one of at least: physical layer operations management maintenance PLOAM message, ONU management control interface OMCI message and gigabit method for packing GEM frame.
10. the described method of according to claim 1 to 9 any one, is characterized in that, described primary OLT switches to spare OLT afterwards or before, also comprise: described spare OLT is obtained the identification information of described part or all of ONU as follows:
Described spare OLT receives the described identification information that described primary OLT sends; Perhaps
Described spare OLT is monitored the uplink frame that described part or all of ONU sends, and obtains described identification information.
11. method according to claim 10 is characterized in that, described identification information comprise following one of at least:
ONU-ID, MAC Address, sequence number information, LLID, balanced time delay value, loop time delay value, loop time, transmission container and gigabit method for packing port-mark.
12. method according to claim 1 is characterized in that, described primary OLT also comprises before switching to spare OLT: the configuration Profile information of the corresponding alternate channel of described primary OLT broadcasting.
13. the described method of according to claim 1 to 6 any one is characterized in that, described spare OLT is that the upstream bandwidth that part or all of ONU distributes comprises:
Described spare OLT is that the guard time guard time between the upstream bandwidth that distributes of described part or all of ONU is guard time between the upstream bandwidth that distributes of described part or all of ONU greater than described primary OLT.
14. method according to claim 1 is characterized in that, described spare OLT is after part or all of ONU distributes upstream bandwidth, also to comprise: the uplink frame that the synchronous described part or all of ONU of described spare OLT sends.
15. the described method of according to claim 1 to 6 any one is characterized in that, described spare OLT also comprises after giving part or all of ONU distribution upstream bandwidth:
If in the described ONU that is assigned with upstream bandwidth partly or entirely ONU get back to initial condition, get back to the ONU of initial condition again through entering operating state after registration activation.
16. a data transmission system is characterized in that, comprises spare OLT and ONU:
Described spare OLT when switching to spare OLT for primary OLT, is that some or all of ONU distributes upstream bandwidth;
The described ONU that is assigned with upstream bandwidth is used for sending upstream data in for the upstream bandwidth that self distributes, and wherein, described spare OLT and/or described some or all of ONU do not change the first range finding result before the OLT switching.
17. system according to claim 16 is characterized in that,
Described spare OLT also is used for when primary OLT switches to described spare OLT, for part or all of ONU distributes upstream bandwidth;
Be assigned with the ONU of upstream bandwidth, also being used for is being to send upstream data according to described primary OLT in the first range finding result that master channel distributes in the upstream bandwidth that distributes separately; Perhaps
Described spare OLT also is used for when described primary OLT switches to described spare OLT, distributes upstream bandwidth for described part or all of ONU at described master channel to the first range finding result of each ONU according to described primary OLT;
Be assigned with the ONU of upstream bandwidth, also being used for is being to send described upstream data in the upstream bandwidth that distributes separately.
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| CN112350778B (en) * | 2019-08-09 | 2022-06-14 | 瑞昱半导体股份有限公司 | Optical network unit and method for transmitting dynamic bandwidth report uplink information |
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