CN102142898A - Ranging method and device of nested PON (passive optical network) - Google Patents
Ranging method and device of nested PON (passive optical network) Download PDFInfo
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- H04J3/06—Synchronising arrangements
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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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- H04Q11/00—Selecting arrangements for multiplex systems
- H04Q11/0001—Selecting arrangements for multiplex systems using optical switching
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Abstract
The embodiment of the invention provides a ranging method and device of a nested PON (passive optical network). The nested PON comprises a nested OLT (optical line termination); the nested PON is connected with first-level ONUs (optical network units) through first-level ODNs (optical distribution networks); and the first-level ONUs are connected with second-level ONUs through second-level ODNs. The method comprises: the first-level ONUs receive second-level PON ranging request messages sent by the nested OLT; and the first-level ONUs are used as the second-level OLTs corresponding to the second-level ONUs and perform ranging on the second-level ONUs. As multiple first-level ONUs are arranged in the nested PON, all first-level ONUs can perform ranging on one second-level ONU under each first-level ONU so as to improve the ranging efficiency of the nested PON; and if a new working second-level ONU is additionally arranged under one first-level ONU, only the first-level ONU needs to perform ranging on the new working second-level ONU without influencing the normal work of other first-level ONUs and the second-level ONUs under the other first-level ONUs, thereby ensuring the normal operation of the nested PON.
Description
Technical field
The embodiment of the invention relates to the communication technology, relates in particular to a kind of nested EPON distance-finding method and the device of (PassiveOptical Network is called for short PON).
Background technology
Nested PON can improve transmission range and the power system capacity of PON effectively under the prerequisite that the optical network unit (Optical Network Unit is called for short ONU) of protection PON is invested.Nested PON is made of an one-level PON and a plurality of secondary PON, by nested optical line terminal (Optical LineTermination, abbreviation OLT), one-level Optical Distribution Network (Optical Distribution Network is called for short ODN), one-level ONU, secondary ODN and secondary ONU constitute.Wherein, nested OLT has gathered the function of the secondary OLT of the one-level OLT of one-level PON and secondary PON; One-level ODN is used to carry the uplink/downlink frames of one-level PON; One-level ONU carries out its task in one-level PON on the one hand, then will carry out the function of a part of secondary OLT on the other hand, to finish information mutual between secondary PON and one-level PON; Secondary ODN is used to carry the uplink/downlink frames of secondary PON; Secondary ONU carries out its task in secondary PON.Among the existing PON,, can between OLT and ONU, directly utilize message interaction, ONU is found range because OLT directly links to each other by ODN with ONU.
Yet among the above-mentioned nested PON, nested OLT is not directly to link to each other by secondary ODN with secondary ONU, also has one-level ODN and one-level ONU in the middle of them, so, can't between nested OLT and secondary ONU, directly utilize message interaction, ONU finds range to secondary.
Summary of the invention
The embodiment of the invention provides distance-finding method and the device of a kind of nested PON, with realization secondary ONU is found range.
The embodiment of the invention provides the distance-finding method of a kind of nested PON, and described nested PON comprises nested OLT, and described nested OLT connects one-level ONU by one-level ODN, and described one-level ONU connects secondary ONU by secondary ODN, and wherein, method comprises:
Described one-level ONU receives the secondary PON distance measurement request message that described nested OLT sends;
Described one-level ONU sends described secondary PON distance measurement request message to described secondary ONU;
Described one-level ONU receives the secondary PON range finding answer message that described secondary ONU sends, and obtains the balanced time delay of described secondary ONU;
Described one-level ONU sends the first descending range finding time message to described secondary ONU, the balanced time delay that comprises described secondary ONU in the described first descending range finding time message is so that described secondary ONU is according to the balanced time delay transmission secondary PON uplink frame of described secondary ONU.
The embodiment of the invention also provides the one-level ONU of a kind of nested PON, and described nested PON comprises nested OLT, and described nested OLT connects described one-level ONU by one-level ODN, and described one-level ONU connects secondary ONU by secondary ODN, and wherein, described one-level ONU comprises:
Receiver module is used to receive the secondary PON distance measurement request message that described nested OLT sends;
Range finder module is used for the secondary OLT as described secondary ONU correspondence, and described secondary ONU is found range, and described range finder module comprises:
Transmitting element is used for sending described secondary PON distance measurement request message to described secondary ONU;
Computing unit is used to receive the secondary PON range finding answer message that described secondary ONU sends, and obtains the balanced time delay of described secondary ONU;
Processing unit, be used for sending the first descending range finding time message to described secondary ONU, the balanced time delay that comprises described secondary ONU in the described first descending range finding time message is so that described secondary ONU is according to the balanced time delay transmission secondary PON uplink frame of described secondary ONU.
As shown from the above technical solution, the embodiment of the invention is after one-level ONU receives the secondary PON distance measurement request message of nested OLT transmission, can be by the secondary OLT of one-level ONU as above-mentioned secondary ONU correspondence, above-mentioned secondary ONU is found range, owing among the nested PON a plurality of one-level ONU are arranged, so all one-level ONU can find range to a secondary ONU under it simultaneously, thereby has improved the range finding efficient of nested PON; If there is the secondary ONU of a new job to be increased under the one-level ONU, so only need this one-level ONU that the secondary ONU of this new work is found range, and can not influence the operate as normal of the secondary ONU under other one-levels ONU and other one-levels ONU, thereby guaranteed the normal operation of nested PON.
Description of drawings
In order to be illustrated more clearly in the embodiment of the invention or technical scheme of the prior art, to do one to the accompanying drawing of required use in embodiment or the description of the Prior Art below introduces simply, apparently, accompanying drawing in describing below is some embodiments of the present invention, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain other accompanying drawing according to these accompanying drawings.
Fig. 1 is the schematic network structure of nested PON;
The schematic flow sheet of the distance-finding method of the nested PON that Fig. 2 provides for the embodiment of the invention one;
The schematic flow sheet of the distance-finding method of the nested PON that Fig. 3 provides for the embodiment of the invention two;
The schematic flow sheet of the distance-finding method of the nested PON that Fig. 4 provides for the embodiment of the invention three;
The structural representation of the one-level ONU of the nested PON that Fig. 5 provides for the embodiment of the invention four;
Another structural representation of the one-level ONU of the nested PON that Fig. 6 provides for the embodiment of the invention four;
Another structural representation of the one-level ONU of the nested PON that Fig. 7 provides for the embodiment of the invention four.
Embodiment
For the purpose, technical scheme and the advantage that make the embodiment of the invention clearer, below in conjunction with the accompanying drawing in the embodiment of the invention, technical scheme in the embodiment of the invention is clearly and completely described, obviously, described embodiment is the present invention's part embodiment, rather than whole embodiment.Based on the embodiment among the present invention, those of ordinary skills belong to the scope of protection of the invention not making the every other embodiment that is obtained under the creative work prerequisite.
Fig. 1 is the schematic network structure of nested PON, as shown in Figure 1, nested PON can comprise nested OLT, nested OLT by one-level ODN connect one-level ONU (one-level ONU 1, one-level ONU2 ..., one-level ONU m), each one-level ONU by secondary ODN connect secondary ONU (secondary ONU 11, secondary ONU 12 ..., secondary ONU 1n; Secondary ONU 21, secondary ONU22 ..., secondary ONU 2n; ...; Secondary ONU m1, secondary ONU m2 ..., secondary ONU mn).
Nested OLT is a server section, specifically can comprise an one-level PON functional module and m secondary PON functional module.Wherein, one-level PON functional module can corresponding one-level PON system, is responsible for carrying out data communication and managing each one-level ONU with m one-level ONU, plays the effect of one-level OLT; M secondary PON functional module can corresponding m secondary PON system, is responsible for and corresponding n secondary ONU carries out data communication and manage each secondary ONU, plays the part effect of secondary OLT.On down direction, each secondary PON functional module is ready to the downlink data of each self-corresponding secondary PON, gives one-level PON functional module.One-level PON functional module is packaged into the downlink frame of an one-level PON to the downlink data of each secondary PON, sends to one-level ONU.On up direction, nested OLT receives after the uplink frame of one-level ONU transmission, at first resolves by one-level PON module, and the upstream data that parses each secondary PON sends to corresponding secondary PON functional module afterwards.
One-level ON U mainly is responsible for the forwarding of upstream data and downlink data, specifically can comprise one-level PON functional module and secondary PON functional module.Wherein, one-level PON functional module is used to utilize one-level PON standard to carry out data communication with nested OLT; Secondary PON functional module is used to utilize secondary PON standard and secondary ONU to carry out data communication, plays the part effect of secondary OLT.On down direction, one-level ONU receives the downlink frame of the one-level PON of nested OLT transmission, parses one's own that part of data, sends to then and own corresponding secondary ONU.On up direction, one-level ONU receives the upstream data of each secondary ONU of own correspondence, is integrated into the uplink burst of an one-level PON then, sends to nested OLT.
ONU among secondary ONU and the existing PON is as broad as long, and secondary PON communication standard is followed in operation.On down direction, secondary ONU receives after the downlink frame of one-level ONU transmission, parses one's own that part of data.On up direction, secondary ONU sends upstream data according to the bandwidth allocation information in the downlink frame in the time slot of oneself.
The schematic flow sheet of the distance-finding method of the nested PON that Fig. 2 provides for the embodiment of the invention one, as shown in Figure 2, the distance-finding method of the nested PON of present embodiment can may further comprise the steps:
Before this step, present embodiment also comprises the step that nested OLT finds range to one-level ONU, and like this, one-level ONU then can not bump at nested OLT place to the uplink frame that nested OLT sends one-level PON.The concrete grammar of range finding can repeat no more referring to the OLT among the PON in the prior art to the related content that ONU finds range herein.
Particularly, in this step, one-level ONU specifically can receive the secondary PON distance measurement request message that nested OLT sends in the downlink frame of secondary PON.
In this step, one-level ONU can be according to the identification information in the secondary PON distance measurement request message, and identifying this secondary PON distance measurement request message is the distance measurement request message that measured secondary ONU is found range.For example: suppose that secondary PON is gigabit (Gigabit) PON (GPON), nested OLT can send secondary PON distance measurement request message with the form of bandwidth mapping table (BWmap) in the downlink frame of secondary PON, wherein, the bandwidth mapping table is used for carrying out bandwidth authorizing, when the bandwidth mapping table was filled in according to specific mode, just can judge current bandwidth mapping table was the distance measurement request of which secondary ONU among the secondary PON.
Particularly, above-mentioned one-level ONU can send (forwarding) above-mentioned secondary PON distance measurement request message to above-mentioned secondary ONU, and open ranging window for measured secondary ONU, window size among the size of ranging window and the existing P ON during OLT range finding is identical, sends and does not have other secondarys ONU to send uplink frame when message is replied in secondary PON range finding to guarantee secondary ONU.Then, above-mentioned one-level ONU receives above-mentioned secondary ONU and replys message according to the secondary PON range finding that above-mentioned secondary PON distance measurement request message sends, obtain the balanced time delay of above-mentioned secondary ONU, above-mentioned one-level ONU sends the first descending range finding time message to above-mentioned secondary ONU, the balanced time delay that comprises above-mentioned secondary ONU in the above-mentioned first descending range finding time message is so that above-mentioned secondary ONU is according to the balanced time delay transmission secondary PON uplink frame of above-mentioned secondary ONU.
Further, above-mentioned one-level ONU can also send (forwarding) above-mentioned secondary PON range finding answer message to above-mentioned nested OLT earlier before to the step that above-mentioned secondary ONU sends the first descending range finding time message, above-mentioned one-level ONU receives above-mentioned nested OLT and replys the second descending range finding time message that message sends according to above-mentioned secondary PON range finding, the balanced time delay of appointment that comprises the secondary ONU that sets in advance in the above-mentioned second descending range finding time message, so that above-mentioned one-level ONU sends the above-mentioned first descending range finding time message to above-mentioned secondary ONU, be the balanced time delay of appointment that one-level ONU replaces the secondary ONU that sets in advance that comprises in the second descending range finding time message with the balanced time delay of the secondary ONU that obtains, send the first descending range finding time message of the balanced time delay of the secondary ONU that comprises acquisition to above-mentioned secondary ONU.
Further, for the ease of nested OLT each secondary ONU is managed, above-mentioned one-level ONU receives the secondary PON range finding answer message that above-mentioned secondary ONU sends, obtain after the step of balanced time delay of above-mentioned secondary ONU, above-mentioned one-level ONU can also send the balanced time delay of the above-mentioned secondary ONU that obtains to above-mentioned nested OLT, so that above-mentioned nested OLT manages described secondary ONU.
In the present embodiment, when nested PON normally moves, the signal that nested OLT expectation one-level ONU is sent just in time arrives in the fixed position of the uplink frame of expecting, and the signal that one-level ONU expectation secondary ONU is sent just in time arrives in the fixed position of the uplink frame of expecting.But one-level ONU or secondary ONU send the phase place of signal and may variation aging owing to optical fiber or ambient temperature drift about.So just need dynamically find range, so that the phase drift of one-level ONU and secondary ONU is revised to one-level ONU among the nested PON and secondary ONU.The concrete grammar that one-level ONU is dynamically found range can repeat no more referring to the OLT among the PON in the prior art to the related content that ONU dynamically finds range herein; The concrete grammar that secondary ONU is dynamically found range can comprise the steps: when above-mentioned one-level ONU detects above-mentioned secondary ONU phase drift takes place, above-mentioned one-level ONU revises the balanced time delay of above-mentioned secondary ONU, the balanced time delay of the secondary ONU after obtaining to revise; Above-mentioned one-level ONU sends the 3rd descending range finding time message to above-mentioned secondary ONU, the balanced time delay that comprises above-mentioned correction secondary ONU afterwards in the above-mentioned the 3rd descending range finding time message is so that above-mentioned secondary ONU is according to the balanced time delay transmission secondary PON uplink frame of the secondary ONU after the above-mentioned correction.
Similarly, for the ease of nested OLT each secondary ONU is managed, above-mentioned one-level ONU can also send the uplink distance measuring time message to above-mentioned nested OLT earlier before to the step that above-mentioned secondary ONU sends the 3rd descending range finding time message, comprise the balanced time delay of above-mentioned correction secondary ONU afterwards in the above-mentioned uplink distance measuring time message; Above-mentioned one-level ONU receives the 3rd descending range finding time message that above-mentioned nested OLT sends according to above-mentioned uplink distance measuring time message, the balanced time delay that comprises above-mentioned correction secondary ONU afterwards in the above-mentioned the 3rd descending range finding time message is so that above-mentioned one-level ONU sends (forwarding) the above-mentioned the 3rd descending range finding time message to above-mentioned secondary ONU.
Similarly, further, for the ease of nested OLT each secondary ONU is managed, when above-mentioned one-level ONU detects above-mentioned secondary ONU phase drift takes place, above-mentioned one-level ONU revises the balanced time delay of above-mentioned secondary ONU, after the step of the balanced time delay of the secondary ONU after obtaining to revise, above-mentioned one-level ONU can also be to the balanced time delay of the secondary ONU after above-mentioned nested OLT sends above-mentioned correction, so that above-mentioned nested OLT manages above-mentioned secondary ONU.
Long distance (Long Reach) GPON can improve transmission range and the power system capacity of PON too effectively under the prerequisite of the ONU of protection PON investment.Length is made of OLT and ONU apart from GPON, has loaded non intelligent power relay on transmission channel, makes the transmission range of GPON extend greatly.The distance-finding method of the nested PON that the embodiment of the invention provides is compared length has following advantage apart from GPON:
After nested OLT among the nested PON finds range to whole one-level ONU successively, so all one-level ONU can find range to a secondary ONU under it simultaneously, because each one-level ONU can find range to a secondary ONU under it simultaneously, thereby improved the range finding efficient of nested PON; And length must be found range to whole ONU successively apart from the OLT among the GPON, and efficient is lower.
In nested PON normal work stage, if there is the secondary ONU of a new job to be increased under the one-level ONU, so only need this one-level ONU that the secondary ONU of this new work is found range, and can not influence the operate as normal of the secondary ONU under other one-levels ONU and other one-levels ONU, guaranteed the normal operation of nested PON; And long apart from the GPON normal work stage, if there is the ONU of a new job to be increased under the OLT, OLT need find range to the ONU of this new work, and stops the data communication with other ONU, thereby has influenced long normal operation apart from GPON.
In the present embodiment, one-level ONU receives after the secondary PON distance measurement request message of nested OLT transmission, can be used as the secondary OLT of above-mentioned secondary ONU correspondence, above-mentioned secondary ONU is found range, owing among the nested PON a plurality of one-level ONU are arranged, so all one-level ONU can find range to a secondary ONU under it simultaneously, thereby has improved the range finding efficient of nested PON; If there is the secondary ONU of a new job to be increased under the one-level ONU, so only need this one-level ONU that the secondary ONU of this new work is found range, and can not influence the operate as normal of the secondary ONU under other one-levels ONU and other one-levels ONU, thereby guaranteed the normal operation of nested PON.
Need to prove: one-level PON that relates in the distance-finding method of the nested PON that the embodiment of the invention provides or secondary PON can comprise multiple PON, for example: EPON, GPON etc.
The schematic flow sheet of the distance-finding method of the nested PON that Fig. 3 provides for the embodiment of the invention two, as shown in Figure 3, the distance-finding method of the nested PON of present embodiment can may further comprise the steps:
In this step, nested OLT can repeat no more referring to the OLT among the PON of the prior art to the related content that ONU finds range the concrete grammar that one-level ONU finds range herein;
Step 302, nested OLT send secondary PON distance measurement request message to one-level ONU, in order to secondary ONU is found range;
Step 303, one-level ONU send above-mentioned secondary PON distance measurement request message to secondary ONU, open ranging window for above-mentioned secondary ONU simultaneously;
Step 305, one-level ONU obtain the balanced time delay of secondary ONU;
In this step, the process of the balanced time delay of one-level ONU acquisition secondary ONU can adopt multiple mode to realize.Below only two kinds of preferable embodiments are wherein described.
In first kind of mode, one-level ONU can reply moment of message and expectation and receives above-mentioned secondary PON range finding and reply time difference between the moment of message receiving above-mentioned secondary PON range finding, adds the balanced time delay that above-mentioned preequalization time delay obtains secondary ONU.
In the second way, one-level ONU can measure loop time delay (Round-Trip Delay earlier, be called for short RTD), promptly send the moment of the downlink frame comprise above-mentioned secondary PON distance measurement request message and receive that above-mentioned secondary PON range finding replys the time difference between the moment of message, deduct zero-time and above-mentioned preequalization time delay sum again, so balanced time delay is poor between balanced time delay of secondary PON zero distance and the described loop time delay.Wherein, the balanced time delay of described secondary PON zero distance refers to that one-level ONU sends the moment and the time difference of estimating to begin to receive the uplink frame that comprises above-mentioned secondary PON range finding answer message of the downlink frame that comprises above-mentioned secondary PON distance measurement request message; Zero-time refers to that secondary ONU begins to send uplink frame that comprises above-mentioned secondary PON range finding answer message and the time difference that begins to send above-mentioned secondary PON range finding answer message.
Step 306, one-level ON U send above-mentioned secondary PON range finding to nested OLT and reply message in the uplink frame of nested OLT for the one-level PON that sends on this one-level ONU distributed time slot;
Step 307, nested OLT send the descending range finding time message of secondary PON to one-level ONU, comprise the balanced time delay that sets in advance in the descending range finding time message of above-mentioned secondary PON;
Step 308, one-level ONU replace the balanced time delay that sets in advance that comprises in the descending range finding time message of above-mentioned secondary PON with the balanced time delay of the secondary ONU of acquisition, and send the descending range finding time message of above-mentioned secondary PON to secondary ONU;
Step 309, secondary ONU write the balanced time delay of the secondary ONU that comprises in the descending range finding time message of above-mentioned secondary PON in the time delay register.
Like this, the range finding result of above-mentioned secondary ONU comes into force, thereby makes above-mentioned secondary ONU send secondary PON uplink frame according to the balanced time delay in the time delay register.
Further, for the ease of nested OLT each secondary ONU is managed, after step 305, above-mentioned one-level ONU can also further send the balanced time delay of the above-mentioned secondary ONU that obtains to above-mentioned nested OLT, so that above-mentioned nested OLT manages described secondary ONU.Particularly, above-mentioned one-level ONU (for example: upstream physical layer operation maintenance management expense message), send the balanced time delay of the above-mentioned secondary ONU that obtains to above-mentioned nested OLT specifically can pass through one-level PON uplink distance measuring time message.Owing to do not define the one-level PON uplink distance measuring time message that possesses this function in the agreement of PON, therefore, the embodiment of the invention has defined a kind of form of new one-level PON uplink distance measuring time message, and being used for one-level ONU will report nested OLT to the range finding result (the balanced time delay of secondary ONU) of secondary ONU.Particularly, the above-mentioned one-level PON uplink distance measuring time message of redetermination comprises ONU identifier (ONUID), the ONU identifier of above-mentioned secondary ONU and the balanced time delay of above-mentioned secondary ONU of the source one-level ONU that sends this one-level PON uplink distance measuring time message at least.
In the present embodiment, one-level ONU receives after the secondary PON distance measurement request message of nested OLT transmission, can be used as the secondary OLT of above-mentioned secondary ONU correspondence, above-mentioned secondary ONU is found range, owing among the nested PON a plurality of one-level ONU are arranged, so all one-level ONU can find range to a secondary ONU under it simultaneously, thereby has improved the range finding efficient of nested PON; If there is the secondary ONU of a new job to be increased under the one-level ONU, so only need this one-level ONU that the secondary ONU of this new work is found range, and can not influence the operate as normal of the secondary ONU under other one-levels ONU and other one-levels ONU, thereby guaranteed the normal operation of nested PON.
The schematic flow sheet of the distance-finding method of the nested PON that Fig. 4 provides for the embodiment of the invention three, as shown in Figure 4, the distance-finding method of the nested PON of present embodiment can may further comprise the steps:
Particularly, when the upstream data of secondary ONU arrives deviation between the moment that the moment of one-level ONU and upstream data that one-level ONU requires secondary ONU arrive one-level ONU and surpasses the deviation time threshold that sets in advance, illustrate that then phase drift takes place secondary ONU.
Step 402, above-mentioned one-level ONU revise the balanced time delay of above-mentioned secondary ONU, the balanced time delay of the secondary ONU after obtaining to revise;
Particularly, if the upstream data of above-mentioned secondary ONU arrives in advance, Yanzhong when should join equilibrium drift time; If the upstream data of above-mentioned secondary ONU postpone to arrive, Yanzhong deduction when drift time should be from equilibrium.Wherein, the upstream data that refers to above-mentioned secondary ONU drift time arrives the time deviation between the moment that the moment of one-level ONU and upstream data that one-level ONU requires secondary ONU arrive one-level ONU.
The bit 8 in step 403, the indication territory (Ind territory) of one-level ONU in the uplink frame of the one-level PON that sends to nested OLT writes 1, and being used to show has urgent message (for example: upstream physical layer operation maintenance management expense message) send need pass through the uplink distance measuring time message;
Step 404, nested OLT distribute the time slot that sends the uplink distance measuring time message for above-mentioned one-level ONU;
Particularly, nested OLT can utilize the bandwidth allocation information in the downlink frame, distributes the time slot that sends the uplink distance measuring time message for above-mentioned one-level ONU;
Particularly, above-mentioned one-level ONU specifically can pass through one-level PON uplink distance measuring time message (for example: upstream physical layer operation maintenance management expense message), the balanced time delay of the secondary ONU after above-mentioned nested OLT sends the correction that obtains.Owing to do not define the one-level PON uplink distance measuring time message that possesses this function in the agreement of PON, therefore, the embodiment of the invention has defined a kind of form of new one-level PON uplink distance measuring time message, and the balanced time delay that is used for the secondary ONU of one-level ONU after will revising reports nested OLT.Particularly, the above-mentioned one-level PON uplink distance measuring time message of redetermination comprises the balanced time delay of ONU identifier and the secondary ONU after the correction of the ONU identifier (ONU ID) of the source one-level ONU that sends this one-level PON uplink distance measuring time message, above-mentioned secondary ONU at least.
Particularly, one-level ONU receives after the descending range finding time message of above-mentioned secondary PON, directly is transmitted to secondary ONU.
Like this, the balanced time delay of above-mentioned secondary ONU is upgraded, thereby makes above-mentioned secondary ONU send secondary PON uplink frame according to the balanced time delay in the time delay register.
In the present embodiment, at one-level ONU secondary ONU is found range (initial ranging) afterwards, when above-mentioned one-level ONU detects above-mentioned secondary ONU phase drift takes place, above-mentioned one-level ONU can revise by the balanced time delay to above-mentioned secondary ONU, thereby has further guaranteed the normal operation of nested PON.
Need to prove: for aforesaid each method embodiment, for simple description, so it all is expressed as a series of combination of actions, but those skilled in the art should know, the present invention is not subjected to the restriction of described sequence of movement, because according to the present invention, some step can adopt other orders or carry out simultaneously.Secondly, those skilled in the art also should know, the embodiment described in the specification all belongs to preferred embodiment, and related action and module might not be that the present invention is necessary.
In the above-described embodiments, the description of each embodiment is all emphasized particularly on different fields, do not have the part that describes in detail among certain embodiment, can be referring to the associated description of other embodiment.
The structural representation of the one-level ONU of the nested PON that Fig. 5 provides for the embodiment of the invention four, the schematic network structure of nested PON can be referring to Fig. 1.As shown in Figure 5, the range unit of the nested PON of present embodiment can comprise receiver module 51 and range finder module 52.Wherein, receiver module 51 receives the secondary PON distance measurement request message that above-mentioned nested OLT sends; Range finder module 52 is found range to above-mentioned secondary ONU as the secondary OLT of secondary ONU correspondence.
The one-level ONU of the nested PON that the function of one-level ONU all can be provided by the embodiment of the invention among the invention described above embodiment one, two and three realizes.
Particularly, as shown in Figure 6, the range finder module 52 in the present embodiment specifically can comprise transmitting element 61, computing unit 62 and processing unit 63.Wherein, transmitting element 61 sends above-mentioned secondary PON distance measurement request message to above-mentioned secondary ONU, computing unit 62 receives the secondary PON range finding answer message that above-mentioned secondary ONU sends, obtain the balanced time delay of above-mentioned secondary ONU, processing unit 63 sends the first descending range finding time message to above-mentioned secondary ONU, the balanced time delay that comprises the above-mentioned secondary ONU of computing unit 62 acquisitions in the above-mentioned first descending range finding time message is so that above-mentioned secondary ONU is according to the balanced time delay transmission secondary PON uplink frame of above-mentioned secondary ONU.
Further, processing unit 63 can also be further used for sending above-mentioned secondary PON range finding to above-mentioned nested OLT and reply message, and receive the second descending range finding time message that above-mentioned nested OLT sends, the balanced time delay of appointment that comprises the secondary ONU that sets in advance in the above-mentioned second descending range finding time message is so that processing unit 63 sends the above-mentioned first descending range finding time message to above-mentioned secondary ONU.
Further, computing unit 62 can also be further used for sending to above-mentioned nested OLT the balanced time delay of the above-mentioned secondary ONU of computing unit 62 acquisitions, so that above-mentioned nested OLT manages above-mentioned secondary ONU.
Further, as shown in Figure 7, range finder module 52 in the present embodiment can further include amending unit 71, be used for when detecting above-mentioned secondary ONU phase drift takes place, balanced time delay to above-mentioned secondary ONU is revised, the balanced time delay of secondary ONU after obtaining to revise, and send the 3rd descending range finding time message to above-mentioned secondary ONU, the balanced time delay that comprises above-mentioned correction secondary ONU afterwards in the above-mentioned the 3rd descending range finding time message is so that above-mentioned secondary ONU is according to the balanced time delay transmission secondary PON uplink frame of the secondary ONU after the above-mentioned correction.
Further, amending unit 71 can also be further used for sending the uplink distance measuring time message to above-mentioned nested OLT, the balanced time delay that comprises the above-mentioned correction secondary ONU afterwards of amending unit 71 acquisitions in the above-mentioned uplink distance measuring time message, and receive the 3rd descending range finding time message that above-mentioned nested OLT sends, the balanced time delay that comprises above-mentioned correction secondary ONU afterwards in the above-mentioned the 3rd descending range finding time message is so that amending unit 71 sends the above-mentioned the 3rd descending range finding time message to above-mentioned secondary ONU.
Further, amending unit 71 can also be further used for the balanced time delay of the secondary ONU after the above-mentioned correction that above-mentioned nested OLT transmission amending unit 71 obtains, so that above-mentioned nested OLT manages above-mentioned secondary ONU.
In the present embodiment, one-level ONU is after receiver module receives the secondary PON distance measurement request message of nested OLT transmission, by the secondary OLT of range finder module as secondary ONU correspondence, above-mentioned secondary ONU is found range, owing among the nested PON a plurality of one-level ONU are arranged, so all one-level ONU can find range to a secondary ONU under it simultaneously, thereby has improved the range finding efficient of nested PON; If there is the secondary ONU of a new job to be increased under the one-level ONU, so only need this one-level ONU that the secondary ONU of this new work is found range, and can not influence the operate as normal of the secondary ONU under other one-levels ONU and other one-levels ONU, thereby guaranteed the normal operation of nested PON.
One of ordinary skill in the art will appreciate that: all or part of step that realizes said method embodiment can be finished by the relevant hardware of program command, aforesaid program can be stored in the computer read/write memory medium, this program is carried out the step that comprises said method embodiment when carrying out; And aforesaid storage medium comprises: various media that can be program code stored such as ROM, RAM, magnetic disc or CD.
It should be noted that at last: above embodiment only in order to technical scheme of the present invention to be described, is not intended to limit; Although with reference to previous embodiment the present invention is had been described in detail, those of ordinary skill in the art is to be understood that: it still can be made amendment to the technical scheme that aforementioned each embodiment put down in writing, and perhaps part technical characterictic wherein is equal to replacement; And these modifications or replacement do not make the essence of appropriate technical solution break away from the spirit and scope of various embodiments of the present invention technical scheme.
Claims (12)
1. the distance-finding method of a nested PON, described nested PON comprises nested OLT, and described nested OLT connects one-level ONU by one-level ODN, and described one-level ONU connects secondary ONU by secondary ODN, it is characterized in that described method comprises:
Described one-level ONU receives the secondary PON distance measurement request message that described nested OLT sends;
Described one-level ONU sends described secondary PON distance measurement request message to described secondary ONU;
Described one-level ONU receives the secondary PON range finding answer message that described secondary ONU sends, and obtains the balanced time delay of described secondary ONU;
Described one-level ONU sends the first descending range finding time message to described secondary ONU, the balanced time delay that comprises described secondary ONU in the described first descending range finding time message is so that described secondary ONU is according to the balanced time delay transmission secondary PON uplink frame of described secondary ONU.
2. method according to claim 1 is characterized in that, described one-level ON U sends the first descending range finding time message to described secondary ONU, also comprises before:
Described one-level ONU sends described secondary PON range finding to described nested OLT and replys message;
Described one-level ONU receives the second descending range finding time message that described nested OLT sends, the balanced time delay of appointment that comprises the secondary ONU that sets in advance in the described second descending range finding time message is so that described one-level ONU sends the described first descending range finding time message to described secondary ONU.
3. method according to claim 1 is characterized in that, described one-level ONU receives the secondary PON range finding answer message that described secondary ONU sends, and obtains also to comprise after the balanced time delay of described secondary ONU:
Described one-level ONU sends the balanced time delay of described secondary ONU to described nested OLT, so that described nested OLT manages described secondary ONU.
4. according to the described method of the arbitrary claim of claim 1 to 3, it is characterized in that described one-level ONU sends the first descending range finding time message to described secondary ONU, also comprises afterwards:
When described one-level ONU detected described secondary ONU phase drift takes place, described one-level ONU revised the balanced time delay of described secondary ONU, the balanced time delay of the secondary ONU after obtaining to revise;
Described one-level ONU sends the 3rd descending range finding time message to described secondary ONU, the balanced time delay that comprises described correction secondary ONU afterwards in the described the 3rd descending range finding time message is so that described secondary ONU is according to the balanced time delay transmission secondary PON uplink frame of the secondary ONU after the described correction.
5. method according to claim 4 is characterized in that, described one-level ONU sends the 3rd descending range finding time message to described secondary ONU, also comprises before:
Described one-level ONU sends the uplink distance measuring time message to described nested OLT, comprises the balanced time delay of described correction secondary ONU afterwards in the described uplink distance measuring time message;
Described one-level ONU receives the 3rd descending range finding time message that described nested OLT sends, the balanced time delay that comprises described correction secondary ONU afterwards in the described the 3rd descending range finding time message is so that described one-level ONU sends the described the 3rd descending range finding time message to described secondary ONU.
6. method according to claim 4, it is characterized in that described when described one-level ONU detects described secondary ONU phase drift takes place, described one-level ONU revises the balanced time delay of described secondary ONU, after the balanced time delay of secondary ONU after obtaining to revise, also comprise:
The balanced time delay of the secondary ONU of described one-level ONU after described nested OLT sends described correction is so that described nested OLT manages described secondary ONU.
7. the one-level ONU of a nested PON, described nested PON comprises nested OLT, and described nested OLT connects described one-level ONU by one-level ODN, and described one-level ONU connects secondary ONU by secondary ODN, it is characterized in that described one-level ONU comprises:
Receiver module is used to receive the secondary PON distance measurement request message that described nested OLT sends;
Range finder module is used for the secondary OLT as described secondary ONU correspondence, and described secondary ONU is found range, and described range finder module comprises:
Transmitting element is used for sending described secondary PON distance measurement request message to described secondary ONU;
Computing unit is used to receive the secondary PON range finding answer message that described secondary ONU sends, and obtains the balanced time delay of described secondary ONU;
Processing unit, be used for sending the first descending range finding time message to described secondary ONU, the balanced time delay that comprises described secondary ONU in the described first descending range finding time message is so that described secondary ONU is according to the balanced time delay transmission secondary PON uplink frame of described secondary ONU.
8. one-level ONU according to claim 7 is characterized in that described processing unit also is used for
Send described secondary PON range finding to described nested OLT and reply message, and receive the second descending range finding time message that described nested OLT sends, the balanced time delay of appointment that comprises the secondary ONU that sets in advance in the described second descending range finding time message is so that described processing unit sends the described first descending range finding time message to described secondary ONU.
9. one-level ONU according to claim 7 is characterized in that described computing unit also is used for
Send the balanced time delay of described secondary ONU to described nested OLT, so that described nested OLT manages described secondary ONU.
10. according to the described one-level ONU of the arbitrary claim of claim 7 to 9, it is characterized in that described range finder module also comprises:
Amending unit, be used for when detecting described secondary ONU phase drift takes place, balanced time delay to described secondary ONU is revised, the balanced time delay of secondary ONU after obtaining to revise, and send the 3rd descending range finding time message to described secondary ONU, the balanced time delay that comprises described correction secondary ONU afterwards in the described the 3rd descending range finding time message is so that described secondary ONU is according to the balanced time delay transmission secondary PON uplink frame of the secondary ONU after the described correction.
11. one-level ONU according to claim 10 is characterized in that, described amending unit also is used for
Send the uplink distance measuring time message to described nested OLT, the balanced time delay that comprises described correction secondary ONU afterwards in the described uplink distance measuring time message, and receive the 3rd descending range finding time message that described nested OLT sends, the balanced time delay that comprises described correction secondary ONU afterwards in the described the 3rd descending range finding time message is so that described amending unit sends the described the 3rd descending range finding time message to described secondary ONU.
12. one-level ONU according to claim 10 is characterized in that, described amending unit also is used for the balanced time delay of the secondary ONU after described nested OLT sends described correction, so that described nested OLT manages described secondary ONU.
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| CN201110077246.5A CN102142898B (en) | 2011-03-29 | 2011-03-29 | Ranging method and device of nested PON (passive optical network) |
| PCT/CN2012/071980 WO2012130022A1 (en) | 2011-03-29 | 2012-03-06 | Ranging method and apparatus in nested pon |
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| CN201110077246.5A CN102142898B (en) | 2011-03-29 | 2011-03-29 | Ranging method and device of nested PON (passive optical network) |
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| WO2012130022A1 (en) | 2012-10-04 |
| CN102142898B (en) | 2014-07-16 |
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