CN102223185A

CN102223185A - Method and system for determining topology structure of passive optical network

Info

Publication number: CN102223185A
Application number: CN201010148818XA
Authority: CN
Inventors: 张伟良; 耿丹; 朱松林
Original assignee: ZTE Corp
Current assignee: ZTE Corp
Priority date: 2010-04-14
Filing date: 2010-04-14
Publication date: 2011-10-19
Anticipated expiration: 2030-04-14
Also published as: CN102223185B

Abstract

The invention discloses a method and a system for determining a topology structure of a passive optical network (PON). The method comprises the following steps that: an optical line terminal (OLT) obtains identification information of a research entenders (RE) apparatus on a path from the OLT to an optical network unit (ONU), wherein the identification information is indicated in an uplink frame of the ONU; and the OLT determines active equipment nearest to the ONU in the PON according to the identification information, wherein the active equipment comprises an RE apparatus or an OLT. According to the invention, the OLT can manage the ONU conveniently.

Description

Definite method and system of passive optical network topological structure

Technical field

The present invention relates to the communications field, in particular to definite method and system of a kind of EPON (PassiveOptical Network abbreviates PON as) system topology.

Background technology

Gigabit passive optical network (Gigabit-Capable Passive Optical Network abbreviates GPON as) technology is an important technology branch among the PON, also is a kind of passive light access technology that a little arrives the multidrop topology structure that adopts.

Fig. 1 is the topological structure schematic diagram of GPON system in the correlation technique, as shown in Figure 1, GPON is by optical line terminal (the Optical Line Terminal of office's side, abbreviate OLT as), optical network unit (the Optical Network Unit of user side, abbreviate ONU as) and Optical Distribution Network (Optical Distribution Network, abbreviate ODN as) form, adopt the network configuration of point usually to multiple spot.Wherein, ODN is made up of Passive Optical Components such as monomode fiber, optical branching device, optical connectors, for the physical connection between OLT and the ONU provides light-transmitting medium.

In the PON system, the data that OLT issues ONU are called downlink frame, and the data that ONU sends to OLT are called uplink frame.When ONU need calculate link load between own and the OLT, OLT need send to ONU by downlink frame with the luminous power of oneself, the OLT luminous power that ONU receives after the emission luminous power information of OLT and ONU self receives compares, and calculates link load.

In PON of future generation system based on the GPON system, in order to make OLT can manage long ONU in the PON system, in the topological structure of PON system, increased range expansion (reach extenders, abbreviate RE as) device, so that amplify the luminous power of the light signal of PON system, make the light signal in the PON system can transmit farther distance, thereby increase the ultimate range between ONU and the OLT.Fig. 2 is the topological structure that has increased the PON system of RE in the correlation technique, as shown in Figure 2, in having increased the PON system of RE, part of O NU links to each other with OLT by an optical splitter, part of O NU links to each other with OLT with a RE device by an optical splitter, also has part of O NU to link to each other with OLT with two RE devices by two optical splitters.

In above-mentioned length in the PON system, OLT does not know the concrete position of ONU in the PON system topology, also just can not determine the identity of the active equipment that concrete ONU of distance is nearest, thereby the luminous power information of the active equipment nearest apart from ONU can't be sent to this ONU, make ONU can't carry out the calculating of link load, be not easy to the management of OLT ONU.

Summary of the invention

Main purpose of the present invention is to provide a kind of definite method and system of passive optical network topological structure, to address the above problem at least.

According to an aspect of the present invention, a kind of definite method of passive optical network topological structure is provided, has may further comprise the steps: optical line terminal OLT is obtained the identity information of the range expansion RE device of OLT indicated in the uplink frame from optical network unit ONU to the path of ONU; And OLT determines the nearest active equipment of EPON middle distance ONU according to identity information, and wherein, active equipment comprises RE device or OLT.

According to another aspect of the present invention, provide a kind of definite method of passive optical network topological structure, may further comprise the steps: the RE device is monitored the uplink frame that ONU is sent to OLT, the sign of obtaining and storing ONU from uplink frame; OLT obtains sign from the RE device, and determines the nearest active equipment of EPON middle distance ONU according to sign, and wherein, active equipment comprises RE device or OLT.

According to a further aspect of the invention, a kind of passive optical network topological structure fixed system really is provided, has comprised OLT, ONU and RE device, wherein, OLT comprises: acquisition module is used for obtaining the identity information of the RE device of the indicated OLT of uplink frame to the path of ONU; Determination module is used for determining the nearest active equipment of EPON middle distance ONU according to identity information that wherein, active equipment comprises RE device or OLT.

According to a further aspect of the invention, provide a kind of passive optical network topological structure fixed system really, comprised OLT, ONU and RE device, wherein, the RE device comprises: monitor module, be used to monitor the uplink frame that ONU is sent to OLT; Acquisition module is used for the sign that ONU was obtained and stored to uplink frame; OLT comprises: acquisition module is used for obtaining sign from the RE device; Determination module is used for determining the nearest active equipment of EPON middle distance ONU according to sign that wherein, active equipment comprises RE device or OLT.

By the present invention, adopt OLT to obtain the identity information of the RE device of indicating in the uplink frame, perhaps OLT obtains the sign of the ONU that the RE device obtains from uplink frame, and according to identity information that obtains or the definite active equipment nearest of sign apart from ONU, solved in the correlation technique and caused managing the problem of inconvenience because OLT can't be known the nearest active equipment of ONU, make ONU become possibility, be convenient to the management of OLT ONU to the calculating of optical link loss value.

Description of drawings

Accompanying drawing described herein is used to provide further understanding of the present invention, constitutes the application's a part, and illustrative examples of the present invention and explanation thereof are used to explain the present invention, do not constitute improper qualification of the present invention.In the accompanying drawings:

Fig. 1 is the topological structure schematic diagram of GPON system in the correlation technique;

Fig. 2 is the topological structure that has increased the PON system of RE in the correlation technique;

Fig. 3 is the flow chart according to definite method of the passive optical network topological structure of the embodiment of the invention;

Fig. 4 is the detail flowchart according to definite method of the passive optical network topological structure of the embodiment of the invention;

Fig. 5 is according to the passive optical network topological structure of the embodiment of the invention structured flowchart of fixed system really;

Fig. 6 is according to the passive optical network topological structure of the embodiment of the invention preferred structure block diagram one of fixed system really;

Fig. 7 is according to the passive optical network topological structure of the embodiment of the invention preferred structure block diagram two of fixed system really;

Fig. 8 is the schematic diagram according to the uplink frame structure of the GTC layer of the GPON of the embodiment of the invention 1 and embodiment 3;

Fig. 9 is the schematic diagram according to the uplink frame structure of the GTC layer of the GPON of the embodiment of the invention 2 and embodiment 4;

Figure 10 is the schematic diagram according to the downlink frame structure of the GTC layer of the GPON of the embodiment of the invention 3;

Figure 11 is the schematic diagram according to the downlink frame structure of the GTC layer of the GPON of the embodiment of the invention 4;

Figure 12 is the flow chart according to definite method of the another kind of passive optical network topological structure of the embodiment of the invention;

Figure 13 is another detail flowchart according to definite method of the passive optical network topological structure of the embodiment of the invention; And

Figure 14 is according to the another kind of passive optical network topological structure of the embodiment of the invention structured flowchart of fixed system really.

Embodiment

Hereinafter will describe the present invention with reference to the accompanying drawings and in conjunction with the embodiments in detail.Need to prove that under the situation of not conflicting, embodiment and the feature among the embodiment among the application can make up mutually.

Comprise ONU in the passive optical network, OLT and RE device, wherein, ONU is connected with OLT by the RE device, perhaps, ONU directly is connected with OLT, ONU is when carrying out link calculating, need to obtain the optical power value of the own nearest active equipment of distance, therefore, OLT need be known the active equipment nearest apart from ONU, this active equipment may be OLT itself, or the RE device, in order to make OLT know the active equipment nearest apart from ONU, the embodiment of the invention provides a kind of definite method of passive optical network topological structure, as shown in Figure 3, this method may further comprise the steps:

Step S302, optical line terminal OLT is obtained the identity information of the RE device of this indicated in the uplink frame from optical network unit ONU OLT to the path of this ONU; And

Step S304, OLT determines the nearest active equipment of EPON middle distance ONU according to this identity information, wherein, active equipment comprises RE device or OLT.

In the correlation technique, OLT can't obtain the active equipment nearest apart from ONU, thereby make ONU can't carry out the calculating of link load, be not easy to the management of OLT to ONU, in the method that the embodiment of the invention provides, OLT can obtain the identity information (for example, the sign RE-ID of RE device) of the RE device to the path of ONU of OLT in the uplink frame, thereby determine the active equipment nearest according to this identity information, be convenient to OLT ONU is managed apart from this ONU.

Fig. 4 is the detail flowchart according to definite method of the passive optical network topological structure of the embodiment of the invention, as shown in Figure 4, preferably, after the step S304, can also comprise:

Step S406, OLT is sent to ONU with the Output optical power of active equipment;

Step S408, ONU obtain the loss value of the optical link between active equipment and this ONU by Output optical power that compares active equipment and the luminous power that ONU receives.

By said method, ONU can compare according to the Output optical power of the nearest active equipment of the distance oneself that OLT sends and the luminous power that oneself is received, obtains the loss value of active equipment and the optical link between self, thereby makes things convenient for the management of OLT to ONU.

Preferably, step S302 can adopt but be not limited to following two kinds of execution modes and realize:

Execution mode one

Step S302 can may further comprise the steps:

Step S3022, the RE device writes the identity information of oneself in uplink frame;

Step S3024, OLT receives uplink frame and obtains this identity information.

In this mode, the RE device writes the identity information of oneself in uplink frame, and OLT determines the identity information of the active equipment nearest apart from each ONU according to the content of the uplink frame of carrying the RE identity information.The method that this RE device writes automatically can be accurately and realize easily uplink frame to its via the carrying of identity information of RE device, and need not to be provided with separately message and carry this information, realize simply, efficient is higher.

The RE device writes the identity information of oneself in uplink frame process can include but not limited to following dual mode:

(1) identity information is write territory in the uplink frame

Step S3022 can comprise: the RE device judges whether the value that carry in predefined territory in the uplink frame is the initial value that ONU writes in advance, if then the identity information with the RE device writes the territory, otherwise, do not carry out any processing;

Correspondingly, step S304 can comprise: OLT judges whether the value of carrying in the territory is initial value, if, determine that then the active equipment nearest apart from ONU is OLT, otherwise, determine that the active equipment nearest apart from ONU is the corresponding RE device of identity information that carries with the territory.

By said process, have only RE device ability to uplink frame in the corresponding territory nearest to write the identity information of oneself apart from ONU, OLT can determine the active equipment nearest apart from ONU from the value that carry in this territory.In this method, only adopt a territory can indicate the RE device nearest apart from ONU, expense is less, and the parsing of OLT end is simpler, the treatment effeciency height.

Wherein, in the uplink frame predefined territory can comprise following one of at least: in upstream physical layer expense territory newly-increased territory, in the GEM frame head newly-increased territory, upstream physical layer Operations,Administration And Maintenance PLOAMu territory, payload field.

(2) identity information is write respective regions in the territory of uplink frame

Step S3022 can comprise: the RE device is determined in the uplink frame in the predefined territory zone corresponding to the RE device, and the identity information of RE is write this zone;

Correspondingly, step S304 can comprise: OLT determines the active equipment nearest apart from ONU according to the identity information that carry in each zone in the territory.

In this way, not only can determine the active equipment nearest, and can obtain the topological structure of whole PON system, be convenient to the management of OLT ONU apart from ONU.

Particularly, can adopt one of following dual mode to realize above-mentioned method.

(1) the RE device is determined in the uplink frame in the predefined territory before the zone corresponding to the RE device, can also comprise: ONU writes first area in the territory with predefined first value, and predefined second value write second area to the n zone in the territory, n is the quantity in the zone that comprises in the territory;

Correspondingly, the RE device is determined in the uplink frame in the predefined territory can specifically to comprise corresponding to the process in the zone of RE device: the RE device determine the zone corresponding to the RE device be regional middle distance first area recently and the value of carrying be the zone of second value;

Correspondingly, the identity information that OLT carries according to each zone in the territory determines that the process of the active equipment nearest apart from ONU can specifically comprise: OLT judges whether the value of carrying in nearest zone, middle distance first area, territory is second value, if, determine that then the active equipment nearest apart from ONU is OLT, otherwise, the RE device of the identity information correspondence that definite active equipment nearest apart from ONU carries for the zone nearest apart from the first area.

Need to prove that the first above-mentioned value can be identical with second value, also can be different.Said process can write identity information according to the order of the RE device of uplink frame institute road warp, thereby is convenient to the parsing of OLT, and need not to adopt position number to identify the position of RE device, has saved the expense in territory.

(2) the RE device is determined in the uplink frame in the predefined territory can also to comprise before the zone corresponding to the RE device: ONU writes n zone, first area to the in the territory with predefined first value, and n is the quantity in the zone that comprises in the territory;

Correspondingly, the RE device determines in the uplink frame that the zone corresponding to the RE device comprises in the predefined territory: the RE device judges whether the value of carrying the first area is first value, if, determine that then the zone corresponding to the RE device is the first area, otherwise, determine zone corresponding to the RE device be regional middle distance first area recently and the value of carrying be the zone of first value;

Correspondingly, the identity information that OLT carries according to each zone in the territory determines that the active equipment nearest apart from ONU comprises: OLT judges whether the value of carrying the first area is first value, if, determine that then the active equipment nearest apart from ONU is OLT, otherwise, determine that the active equipment nearest apart from ONU is the RE device of the first area identity information correspondence of carrying.

Execution mode two

Step S302 can may further comprise the steps:

Step S3021, RE device write the identity information of oneself in OLT is sent to the downlink frame of ONU;

Step S3023, ONU are carried at this identity information and are sent to OLT in the uplink frame;

Step S3025, OLT receives uplink frame and obtains identity information.

As another optional execution mode, the RE device can the road warp the identity information that in downlink frame, writes oneself, after ONU obtains this information, it is write be sent to OLT in the uplink frame, OLT determines the identity information of the active equipment nearest apart from each ONU according to the content of the uplink frame of carrying the RE identity information.This mode can be used in combination with execution mode one.

The RE device writes the identity information of oneself in downlink frame process can include but not limited to following dual mode:

(1) identity information is write territory in the downlink frame

Step S3021 can comprise: the RE device writes the identity information of RE device in predefined first territory in downlink frame;

Correspondingly, step S3023 can comprise: the value that ONU carries first territory writes in the uplink frame and is sent to OLT in predefined second territory;

Correspondingly, step S304 can comprise: OLT judges whether the value of carrying in second territory is the initial value that OLT writes in advance, if determine that then the active equipment nearest apart from ONU is OLT, otherwise, determine that the active equipment nearest apart from ONU is the corresponding RE device of identity information that carries with second territory.

Pass through said process, the RE device constantly writes the identity information of oneself in this territory, after the identity information of RE device cover the identity information of RE device the preceding, like this, arrive in the downlink frame at ONU place, the value in this territory is the identity information of the RE device nearest apart from ONU, and is follow-up, ONU sends to OLT with this identity information by uplink frame, and OLT can determine the active equipment nearest apart from ONU.In this method, only adopt a territory can indicate the RE device nearest apart from ONU, expense is less, and the parsing of OLT end is simpler, the treatment effeciency height.

Wherein, first territory can comprise following one of at least: in downlink physical controll block PCBd territory newly-increased territory, in the GEM frame head newly-increased territory, down physical layer Operations,Administration And Maintenance PLOAMd territory, payload field; Second territory comprise following one of at least: in upstream physical layer expense territory newly-increased territory, in the GEM frame head newly-increased territory, upstream physical layer Operations,Administration And Maintenance PLOAMu territory, payload field.And first territory can be identical with second territory, also can be different.

(2) identity information is write respective regions in the territory of downlink frame

Step S3021 can comprise: the RE device is determined in the downlink frame in predefined first territory zone corresponding to self, and the identity information of RE is write this zone;

Correspondingly, step S3023 can comprise: the value that ONU carries each zone in first territory writes in the respective regions in predefined second territory in the uplink frame and is sent to OLT;

Correspondingly, step S304 can comprise: OLT determines the active equipment nearest apart from ONU according to the identity information that carry in each zone in second territory.

(1) the RE device is determined in the downlink frame in predefined first territory before the zone corresponding to the RE device, can also comprise: OLT writes first area in first territory with predefined first value, and predefined second value write second area to the n zone in first territory, wherein, n is the quantity in the zone that comprises in first territory;

Correspondingly, the RE device determines in the downlink frame that the zone corresponding to the RE device can comprise particularly in predefined first territory: the RE device determine corresponding to the zone of RE device for each regional middle distance first area recently and the value of carrying be the zone of second value;

Correspondingly, the identity information that OLT carries according to each zone in second territory determines that the process of the active equipment nearest apart from ONU can specifically comprise: OLT judges whether the value of carrying in the nearest zone, middle distance first area, second territory is second value, if, determine that then the active equipment nearest apart from ONU is OLT, otherwise, determine apart from the nearest active equipment of ONU for apart from the first area farthest and the value of carrying be not the RE device of the zone of first value identity information correspondence of carrying.

Need to prove that the first above-mentioned value can be identical with second value, also can be different.Said process can write identity information according to the order of the RE device of downlink frame institute road warp, thereby is convenient to the parsing of OLT, and need not to adopt position number to identify the position of RE device, has saved the expense in territory.And, because first value is represented the residing position of ONU, therefore, even the RE device is write identity information and RE device write identity information in downlink frame method in uplink frame use together, OLT also can determine the active equipment nearest apart from ONU, and determines the network topology structure of whole PON.

(2) the RE device is determined in the downlink frame in predefined first territory also to comprise before the zone corresponding to the RE device: OLT writes n zone, first area to the in first territory with predefined first value, and wherein, n is the quantity in the zone that comprises in first territory;

Correspondingly, the RE device determines in the downlink frame that the zone corresponding to the RE device comprises in predefined first territory: the RE device judges whether the value of carrying the first area is first value, if, determine that then the zone corresponding to the RE device is the first area, otherwise, determine zone corresponding to the RE device be regional middle distance first area recently and the value of carrying be the zone of first value;

Correspondingly, the identity information that OLT carries according to each zone in second territory determines that the active equipment nearest apart from ONU comprises: OLT judges whether the value of carrying the first area in second territory is first value, if, determine that then the active equipment nearest apart from ONU is OLT, otherwise, determine the active equipment nearest apart from ONU be middle distance first area, second territory farthest and the value of carrying be not the RE device of the zone of first value identity information correspondence of carrying.

Wherein, first territory can comprise following one of at least: in downlink physical controll block PCBd territory newly-increased territory, in the GEM frame head newly-increased territory, down physical layer Operations,Administration And Maintenance PLOAMd territory, payload field; Second territory can comprise following one of at least: in upstream physical layer expense territory newly-increased territory, in the GEM frame head newly-increased territory, upstream physical layer Operations,Administration And Maintenance PLOAMu territory, payload field.And first territory can be identical with second territory, also can be different.

Need to prove that the identity information of above RE can be that OLT distributes to RE, also can be the default value of the local storage of RE.

Fig. 5 is that as shown in Figure 5, this system comprises OLT 52, ONU 54 and RE device 56 according to the passive optical network topological structure of the embodiment of the invention structured flowchart of fixed system really, and wherein, OLT 52 can comprise:

Acquisition module 521 is used for obtaining the identity information of the indicated range expansion RE device of uplink frame;

Determination module 522 is used for determining the nearest active equipment of EPON middle distance ONU54 according to identity information that wherein, active equipment comprises RE device or this OLT 52.

Fig. 6 is that RE device 56 can comprise according to the passive optical network topological structure of the embodiment of the invention preferred structure block diagram one of fixed system really: first writing module 62 is used for writing in uplink frame the identity information of RE device 56.

Fig. 7 is according to the passive optical network topological structure of the embodiment of the invention preferred structure block diagram two of fixed system really, RE device 56 can comprise: second writing module 72 is used for writing in the downlink frame that OLT 52 is sent to ONU 54 identity information of RE device 56; ONU 54 comprises: configuration module 74 is used for identity information is carried at uplink frame; Sending module 76 is used for uplink frame is sent to OLT 52.

The embodiment 1-6 that describes below combines the technical scheme of above-mentioned a plurality of preferred embodiments.

Embodiment 1

This embodiment describes the RE device writes the identity information of oneself in uplink frame method in detail, corresponding to (1) kind mode in the above-mentioned execution mode one, the topological structure of GPON system as shown in Figure 2, OLT writes oneself identity information by the RE device in the newly-increased territory in uplink frame, determine the identity information of the active equipment that the GPON system is nearest apart from each ONU.

Among this embodiment, increased newly and carried the RE identity information (promptly, RE identifies (RE-ID)) the territory the uplink frame structure as shown in Figure 8, RE-ID is positioned at and delimits territory and bit interleaved parity (Bit Interleaved Parity, abbreviate BIP as) between the territory, RE-ID also can be in any position of delimiting between territory and first DBRu territory, and RE-ID also can be arranged in the GEM frame head of Gigabit passive optical network packaging mode (GEM) frame of payload field.OLT determines that the step of identity information of the active equipment that the GPON system is nearest apart from each ONU is as follows:

Step 1.OLT sends the value of the RE-ID of this RE for respectively each RE in the GPON system, and the value of RE-ID is a nonzero value, the value that the RE device receives and stores described RE-ID.

Step 2.ONU writes initial information 0 in the RE-ID territory in uplink frame as shown in Figure 8.

After step 3.RE device is received the uplink frame of ONU transmission, whether the value of checking RE-ID territory described in the uplink frame is 0, if the value in described territory is 0, then the RE device writes the RE-ID value of oneself in described territory, if the value in described territory is non-0 value, then RE does not carry out any operation.

After step 4.OLT receives described uplink frame, the value by the ONU in uplink frame sign (ONU-ID) and the value in described RE-ID territory obtain the identity information apart from the nearest active equipment of this ONU, if the value in RE-ID territory is 0, then do not have the RE device between this ONU and the OLT, the active equipment nearest apart from this ONU is OLT; If the value in RE-ID territory is i, and i＞0, then there is the RE device between this ONU and the OLT, the active equipment nearest apart from this ONU is that RE-ID is the RE device of i.OLT stores the ONU-ID of each ONU and apart from the corresponding relation between the nearest active equipment of this ONU.

Pass through above-mentioned steps, OLT can determine the identity information of the active equipment that each ONU of middle distance of GPON system is nearest, further, after OLT can read the Output optical power of all RE devices, OLT gave each this ONU of ONU transmission range the Output optical power of nearest active equipment; ONU receives behind the Output optical power of the nearest active equipment of distance oneself that OLT sends and the luminous power of oneself receiving compares, and obtains link loss value own and apart from the link between oneself nearest active equipment.

In the present embodiment, the RE-ID of RE device can be that OLT distributes to RE, also can be the default value of the local storage of RE.

In the present embodiment, ONU writes 0 in the RE-ID territory, newly-increased territory in uplink frame, the RE device writes the RE-ID value of oneself in described RE-ID territory, the data field of PLOAM message that also can adopt ONU to transmit the identity information of RE device newly-built being used in other embodiment writes 0, and the RE device is to write the RE-ID value of oneself at 0 o'clock in this territory in the value of judging described data field then.Also can adopt ONU to transmit ONU management control interface (the ONTManagement and Control Interface of the identity information of RE device newly-built being used to, abbreviating OMCI as) message content territory in the message writes 0, and the RE device is to write the RE-ID value of oneself at 0 o'clock in this territory in the value of judging described message content territory then.

Embodiment 2

This embodiment describes the RE device writes the identity information of oneself in uplink frame method in detail, corresponding to (2) kind mode in the above-mentioned execution mode one, the topological structure of GPON system as shown in Figure 2, OLT writes oneself identity information by the RE device in the newly-increased territory in uplink frame, determine the identity information of the active equipment that the GPON system is nearest apart from each ONU and the topological structure of PON system.

Among this embodiment, increased newly and carried the RE identity information (promptly, RE identifies (RE-ID)) the territory the uplink frame structure as shown in Figure 9, RE-ID is delimiting between territory and the BIP territory, RE-ID also can be in any position of delimiting between territory and first DBRu territory, and RE-ID also can be arranged in the GEM frame head of Gigabit passive optical network packaging mode (GEM) frame of payload field.RE-ID is made up of 8 zones, is respectively zone 1, regional 2... and zone 8.OLT determines that the step of topological structure of the identity information of the active equipment that the GPON system is nearest apart from each ONU and PON system is as follows:

Zone 1 writes initial information 1 in the RE-ID territory of step 2.ONU in uplink frame as shown in Figure 9, and the zone 2 in the RE-ID territory writes initial information 0 to zone 8.

After step 3.RE device is received the uplink frame that ONU sends, in being 0 regional m, described RE-ID territory middle distance zone 1 nearest value writes the RE-ID value of oneself, 2≤m≤8.

After step 4.OLT receives described uplink frame, arrive the value acquisition in zone 8 apart from the identity information of the nearest active equipment of this ONU and the topological structure of PON system by the value of the sign of the ONU in the uplink frame (ONU-ID) and the zone 1 in described RE-ID territory, if the value in the zone 2 in RE-ID territory is 0, then do not have the RE device between this ONU and the OLT, the active equipment nearest apart from this ONU is OLT; If the value in the zone 2 in RE-ID territory is i, i＞0, the value in zone 3 is 0, then has a RE device between this ONU and the OLT, the active equipment nearest apart from this ONU is that RE-ID is the RE device of i; If the value in the zone 2 in RE-ID territory is i, i＞0, the value in the zone 3 in RE-ID territory is j, j＞0, the value in the zone 4 in RE-ID territory is 0, then has 2 RE devices between this ONU and the OLT, and ONU is that the RE device of i is connected to the RE device that RE-ID is j by RE-ID, RE-ID is that the RE device of j links to each other with OLT, by that analogy.OLT stores the ONU-ID of each ONU and apart from the corresponding relation between the nearest active equipment of this ONU, and stores the corresponding relation between the RE-ID of the ONU-ID of each ONU and the RE device between this ONU and the OLT.

Pass through above-mentioned steps, OLT can determine the identity information of the active equipment that each ONU of middle distance of GPON system is nearest and the topological structure of PON system, further, after OLT can read the Output optical power of all RE devices, OLT gave each this ONU of ONU transmission range the Output optical power of nearest active equipment; ONU receives behind the Output optical power of the nearest active equipment of distance oneself that OLT sends and the luminous power of oneself receiving compares, and obtains link loss value own and apart from the link between oneself nearest active equipment.

In the present embodiment, the RE-ID of RE device is that OLT distributes to RE, also can be the default value of the local storage of RE.

In the present embodiment, zone 1 in the RE-ID territory, newly-increased territory of ONU in uplink frame writes 1 and 0 initial value in zone 8, the RE device writes the RE-ID value of oneself in described RE-ID territory middle distance zone 1 nearest value is 0 regional m, 2≤m≤8, the data field of PLOAM message that also can adopt ONU to transmit the identity information of RE device newly-built being used in other embodiment writes initial information, and the RE device writes the RE-ID value of oneself in this territory then.The message content territory of OMCI message that also can adopt ONU to transmit the identity information of RE device newly-built being used for writes initial value, and the RE device writes the RE-ID value of oneself in described message content territory then.

Embodiment 3

This embodiment describes the RE device writes the identity information of oneself in downlink frame method in detail, specifically corresponding to (1) kind mode in the above-mentioned execution mode two, the topological structure of GPON system as shown in Figure 2, OLT is sending to OLT by the RE device writes oneself in the newly-increased territory in downlink frame identity information and ONU with above-mentioned information, determines the identity information of the active equipment that the GPON system is nearest apart from each ONU.

In this embodiment, increased newly and carried the RE identity information (promptly, RE identifies (RE-ID)) the territory the downlink frame structure as shown in figure 10, RE-ID is positioned at synchronously between (Psync) territory and indication (Ident) territory, RE-ID also can be between Psync territory and payload field any position, RE-ID also can be arranged in the GEM frame head of Gigabit passive optical network packaging mode (GEM) frame of payload field.OLT determines that the step of identity information of the active equipment that the GPON system is nearest apart from each ONU is as follows:

Step 2.OLT writes initial information 0 in the RE-ID territory in downlink frame as shown in figure 10.

After step 3.RE device is received the downlink frame of OLT transmission, write the RE-ID value of oneself in the territory of RE-ID described in the downlink frame.

After step 4.ONU receives above-mentioned downlink frame, obtain the value of RE-ID, the value of described RE-ID is write RE-ID territory in the uplink frame shown in Figure 8, and described uplink frame is sent to OLT.

After step 5.OLT receives described uplink frame, the value by the ONU in uplink frame sign (ONU-ID) and the value in described RE-ID territory obtain the identity information apart from the nearest active equipment of this ONU, if the value in RE-ID territory is 0, then do not have the RE device between this ONU and the OLT, the active equipment nearest apart from this ONU is OLT; If the value in RE-ID territory is i, then there is the RE device in i＞0 between this ONU and the OLT, and the active equipment nearest apart from this ONU is that RE-ID is the RE device of i.OLT stores the ONU-ID of each ONU and apart from the corresponding relation between the nearest active equipment of this ONU.

In the present embodiment, OLT writes 0 in the RE-ID territory, newly-increased territory in downlink frame, the RE device writes the RE-ID value of oneself in described RE-ID territory, the data field of PLOAM message that also can adopt OLT to transmit the identity information of RE device newly-built being used in other embodiment writes 0, and the RE device writes the RE-ID value of oneself at described data field then.The message content territory of OMCI message that also can adopt OLT to transmit the identity information of RE device newly-built being used for writes 0, and the RE device writes the RE-ID value of oneself in described message content territory then.

In the present embodiment, ONU writes RE-ID territory in the uplink frame shown in Figure 3 with described RE-ID value, and described uplink frame sent to OLT, in other embodiments, the data field of PLOAM message that also can adopt ONU to transmit the identity information of RE device newly-built being used for writes the value of described RE-ID, the ONU that also can adopt ONU to transmit the identity information of RE device newly-built being used to manages control interface, and (ONT Management and Control Interface, OMCI) the message content territory in the message writes the value of described RE-ID.

Embodiment 4

This embodiment describes the RE device writes the identity information of oneself in downlink frame method in detail, it is corresponding to (2) kind mode in the above-mentioned execution mode two, the topological structure of GPON system as shown in Figure 2, OLT writes oneself identity information by the RE device in the newly-increased territory in uplink frame, determine the identity information of the active equipment that the GPON system is nearest apart from each ONU and the topological structure of PON system.

Among this embodiment, increased newly and carried the RE identity information (promptly, RE identifies (RE-ID)) the territory the downlink frame structure as shown in figure 11, RE-ID is positioned at synchronously between (Psync) territory and indication (Ident) territory, RE-ID also can be between Psync territory and payload field any position, RE-ID also can be arranged in the GEM frame head of Gigabit passive optical network packaging mode (GEM) frame of payload field.RE-ID is made up of 8 zones, is respectively zone 1, regional 2... and zone 8.OLT determines that the step of topological structure of the identity information of the active equipment that the GPON system is nearest apart from each ONU and PON system is as follows:

Zone 1 writes initial information 1 in the RE-ID territory of step 2.OLT in downlink frame as shown in figure 11, and the zone 2 in the RE-ID territory writes initial information 0 to zone 8.

After step 3.RE device is received the downlink frame that OLT sends, in being 0 regional m, described RE-ID territory middle distance zone 1 nearest value writes the RE-ID value of oneself, 2≤m≤8.

After step 4.ONU receives above-mentioned downlink frame, obtain the value of RE-ID, the value of described RE-ID is write RE-ID territory in the uplink frame shown in Figure 9, and described uplink frame is sent to OLT.

After step 5.OLT receives described uplink frame, arrive the value acquisition in zone 8 apart from the identity information of the nearest active equipment of this ONU and the topological structure of PON system by the value of the sign of the ONU in the uplink frame (ONU-ID) and the zone 1 in described RE-ID territory, if the value in the zone 2 in RE-ID territory is 0, then do not have the RE device between this ONU and the OLT, the active equipment nearest apart from this ONU is OLT; If the value in the zone 2 in RE-ID territory is i, i＞0, the value in zone 3 is 0, then has a RE device between this ONU and the OLT, the active equipment nearest apart from this ONU is that RE-ID is the RE device of i; If the value in the zone 2 in RE-ID territory is i, i＞0, the value in the zone 3 in RE-ID territory is j, j＞0, the value in the zone 4 in RE-ID territory is 0, then has 2 RE devices between this ONU and the OLT, and ONU is that the RE device of j is connected to the RE device that RE-ID is i by RE-ID, RE-ID is that the RE device of i links to each other with OLT, by that analogy.OLT stores the ONU-ID of each ONU and apart from the corresponding relation between the nearest active equipment of this ONU, and stores the corresponding relation between the RE-ID of the ONU-ID of each ONU and the RE device between this ONU and the OLT.

In the present embodiment, zone 1 in the RE-ID territory, newly-increased territory of OLT in downlink frame writes 1 and 0 initial value in zone 8, the RE device writes the RE-ID value of oneself in described RE-ID territory middle distance zone 1 nearest value is 0 regional m, 2≤m≤8, the data field of PLOAM message that also can adopt OLT to transmit the identity information of RE device newly-built being used in other embodiment writes initial information, and the RE device writes the RE-ID value of oneself in this territory then.The message content territory of OMCI message that also can adopt OLT to transmit the identity information of RE device newly-built being used for writes initial value, and the RE device writes the RE-ID value of oneself in described message content territory then.

In the present embodiment, ONU writes RE-ID territory in the uplink frame shown in Figure 9 with described RE-ID value, and described uplink frame sent to OLT, in other embodiments, the data field of PLOAM message that also can adopt ONU to transmit the identity information of RE device newly-built being used for writes the value of described RE-ID, and the message content territory of OMCI message that also can adopt ONU to transmit the identity information of RE device newly-built being used for writes the value of described RE-ID.

Embodiment 5

Zone 1 writes initial information 0 to zone 8 in the RE-ID territory of step 2.ONU in uplink frame as shown in Figure 9.

After step 3.RE device is received the uplink frame of ONU transmission, judge whether zone 1 value of carrying is 0, if, then in zone 1, write the RE-ID value of oneself, otherwise, in described RE-ID territory middle distance zone 1 nearest value is 0 regional m, write oneself RE-ID value, 2≤m≤8.

After step 4.OLT receives described uplink frame, arrive the value acquisition in zone 8 apart from the identity information of the nearest active equipment of this ONU and the topological structure of PON system by the value of the sign of the ONU in the uplink frame (ONU-ID) and the zone 1 in described RE-ID territory, if the value in the zone 1 in RE-ID territory is 0, then do not have the RE device between this ONU and the OLT, the active equipment nearest apart from this ONU is OLT; If the value in the zone 1 in RE-ID territory is i, i＞0, then the active equipment nearest apart from this ONU is that RE-ID is the RE device of i between this ONU and the OLT.

In the present embodiment, zone 1 in the RE-ID territory, newly-increased territory of ONU in uplink frame writes initial value 0 in zone 8, zone 1 or the distance areas 1 nearest value of RE device in described RE-ID territory is the RE-ID value that writes oneself among 0 the regional m, 2≤m≤8, the data field of PLOAM message that also can adopt ONU to transmit the identity information of RE device newly-built being used in other embodiment writes initial information, and the RE device writes the RE-ID value of oneself in this territory then.The message content territory of OMCI message that also can adopt ONU to transmit the identity information of RE device newly-built being used for writes initial value, and the RE device writes the RE-ID value of oneself in described message content territory then.

Embodiment 6

Zone 1 writes initial information 0 to zone 8 in the RE-ID territory of step 2.OLT in downlink frame as shown in figure 11.

After step 3.RE device is received the downlink frame of OLT transmission, judge whether zone 1 value of carrying is 0, if, then in zone 1, write the RE-ID value of oneself, otherwise, in described RE-ID territory middle distance zone 1 nearest value is 0 regional m, write oneself RE-ID value, 2≤m≤8.

After step 5.OLT receives described uplink frame, arrive the value acquisition in zone 8 apart from the identity information of the nearest active equipment of this ONU and the topological structure of PON system by the value of the sign of the ONU in the uplink frame (ONU-ID) and the zone 1 in described RE-ID territory, if the value in the zone 1 in RE-ID territory is 0, then do not have the RE device between this ONU and the OLT, the active equipment nearest apart from this ONU is OLT; If the value in the zone 1 in RE-ID territory is i, i＞0, the value in zone 2 is 0, then has a RE device between this ONU and the OLT, the active equipment nearest apart from this ONU is that RE-ID is the RE device of i; If the value in the zone 1 in RE-ID territory is i, i＞0, the value in zone 2 is j, the value in zone 3 is 0, then there are 2 RE devices between this ONU and the OLT, ONU is that the RE device of j is connected to the RE device that RE-ID is i by RE-ID, and RE-ID is that the RE device of i links to each other with OLT, and the active equipment nearest apart from this ONU is that RE-ID is the RE device of j; If the value in the zone 1 in RE-ID territory is i, i＞0, the value in the zone 2 in RE-ID territory is j, j＞0, the value in the zone 3 in RE-ID territory is k, k＞0, the value in the zone 4 in RE-ID territory is 0, then has 3 RE devices between this ONU and the OLT, ONU is that the RE device of k is connected to the RE device that RE-ID is j by RE-ID, RE-ID is that the RE device of j is connected to the RE device that RE-ID is i, and RE-ID is that the RE device of i links to each other with OLT, by that analogy.OLT stores the ONU-ID of each ONU and apart from the corresponding relation between the nearest active equipment of this ONU, and stores the corresponding relation between the RE-ID of the ONU-ID of each ONU and the RE device between this ONU and the OLT.

In the present embodiment, zone 1 in the RE-ID territory, newly-increased territory of OLT in downlink frame writes initial value 0 in zone 8, zone 1 or the distance areas 1 nearest value of RE device in described RE-ID territory is the RE-ID value that writes oneself among 0 the regional m, 2≤m≤8, the data field of PLOAM message that also can adopt OLT to transmit the identity information of RE device newly-built being used in other embodiment writes initial information, and the RE device writes the RE-ID value of oneself in this territory then.The message content territory of OMCI message that also can adopt OLT to transmit the identity information of RE device newly-built being used for writes initial value, and the RE device writes the RE-ID value of oneself in described message content territory then.

Figure 12 is that this method may further comprise the steps according to the flow chart of definite method of the another kind of passive optical network topological structure of the embodiment of the invention:

Step S1202, the RE device is monitored the uplink frame that ONU is sent to OLT, the sign of obtaining and storing ONU from uplink frame;

Step S1204, OLT obtains sign from the RE device, and determines the nearest active equipment of EPON middle distance ONU according to sign, and wherein, active equipment comprises RE device or OLT.

In the correlation technique, OLT can't obtain the active equipment nearest apart from ONU, thereby make ONU can't carry out the calculating of link load, be not easy to the management of OLT to ONU, in the method that the embodiment of the invention provides, the RE device obtains the sign of ONU from uplink frame, and OLT obtains this sign from the RE device, and, be convenient to OLT ONU is managed according to the next definite active equipment nearest of this sign apart from this ONU.

Preferably, OLT determines that according to sign the nearest active equipment of EPON middle distance ONU comprises: OLT judges whether the sign of i ONU does not belong to the sign of obtaining from any RE device, if, then i nearest active equipment of ONU of judging distance is OLT, otherwise, from all RE devices, selection stores the RE device of quantity minimum of the sign of the sign of i ONU and storage, and the RE device of selecting is defined as i active equipment that ONU is nearest of distance, wherein, i=1 ..., N, and N is the quantity of the ONU that comprises in the EPON.

By this method, the sign of the ONU that obtains from each RE device relatively, and according to the sign of all ONU of OLT storage, and the relation between the sign obtained from different RE devices of OLT, analyze whole PON topology of networks, and determine the active equipment nearest apart from each ONU, be convenient to the management of OLT to ONU.

Figure 13 is another detail flowchart according to definite method of the passive optical network topological structure of the embodiment of the invention, as shown in figure 13, preferably, after the step S1204, can also comprise:

Step S1306, OLT is sent to ONU with the Output optical power of active equipment;

Step S1308, ONU obtain the loss value of the optical link between active equipment and this ONU by Output optical power that compares active equipment and the luminous power that ONU receives.

Figure 14 is according to the another kind of passive optical network topological structure of the embodiment of the invention structured flowchart of fixed system really, comprise OLT 52, ONU 54 and RE device 56, wherein, RE device 56 comprises: monitor module 1402, be used to monitor the uplink frame that ONU 54 is sent to OLT 52; Acquisition module 1404 is used for the sign that ONU 54 was obtained and stored to uplink frame; OLT 52 comprises: acquisition module 1406 is used for obtaining sign from RE device 56; Determination module 1408 is used for determining the active equipment that EPON middle distance ONU 54 is nearest according to sign that wherein, active equipment comprises RE device 56 or OLT 52.

The embodiment 7 that describes below combines the technical scheme of above-mentioned a plurality of preferred embodiments.

Embodiment 7

This embodiment describes the method that RE monitors uplink frame in detail, the topological structure of GPON system as shown in Figure 2, OLT monitor by the RE device and the storage uplink frame in ONU-ID determine the identity information of the active equipment that the GPON system is nearest apart from each ONU and the topological structure of PON system.OLT determines that the step of topological structure of the identity information of the active equipment that the GPON system is nearest apart from each ONU and PON system is as follows:

Step 1.OLT is stored in the value of all ONU-ID in the local ONU-ID table;

The value that step 2.OLT sends the RE-ID of this RE for respectively each RE in the GPON system, the value that the RE device receives and stores described RE-ID;

Step 3.RE device is monitored the content of ONU sign (ONU-ID) in the uplink frame, and with the ONU-ID content stores in the ONU-ID of this locality table;

Step 4.OLT reads the ONU-ID table at all RE places, OLT is the value of the ONU-ID in the ONU-ID table of all RE places and OLT this locality relatively, if part of O NU-ID value belongs to the ONU-ID table of the local storage of OLT, but be not connected the RE device between the ONU-ID table that does not belong to any one RE device place, then described part of O NU and OLT; If part of O NU-ID value belongs to the ONU-ID table of RE device 1, and do not belong to the ONU-ID table of any other RE device, then described part of O NU directly is connected RE device 1; If part of O NU-ID value belongs to the ONU-ID table of RE device 1, and the ONU-ID table that belongs to RE device 2, and the ONU-ID number that comprises in the ONU-ID table of the ONU-ID number that comprises in the ONU-ID of RE device 2 table greater than RE device 1, then described part of O NU directly is connected RE device 1, and described part of O NU links to each other with RE device 2 by RE device 1, links to each other with OLT by RE device 2 then; By that analogy.OLT stores the ONU-ID of each ONU and apart from the corresponding relation between the nearest active equipment of this ONU, and stores the corresponding relation between the RE-ID of the ONU-ID of each ONU and the RE device between this ONU and the OLT.

In sum, the scheme that the embodiment of the invention provides makes ONU become possibility to the calculating of optical link loss value, is convenient to the management of OLT to ONU.

Need to prove, can in computer system, carry out in the step shown in the flow chart of accompanying drawing such as a set of computer-executable instructions, and, though there is shown logical order in flow process, but in some cases, can carry out step shown or that describe with the order that is different from herein.

The above is the preferred embodiments of the present invention only, is not limited to the present invention, and for a person skilled in the art, the present invention can have various changes and variation.Within the spirit and principles in the present invention all, any modification of being done, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.

Claims

1. definite method of a passive optical network topological structure is characterized in that, may further comprise the steps:

Optical line terminal OLT is obtained the identity information of the range expansion RE device of described OLT indicated in the uplink frame from optical network unit ONU to the path of described ONU; And

Described OLT determines the nearest active equipment of the described ONU of EPON middle distance according to described identity information, and wherein, described active equipment comprises described RE device or described OLT.

2. method according to claim 1 is characterized in that, the identity information that OLT obtains the RE device of described OLT indicated in the uplink frame from ONU to the path of described ONU comprises:

Described RE device writes the identity information of described RE device in described uplink frame;

Described OLT receives described uplink frame and obtains described identity information.

3. method according to claim 2 is characterized in that,

Described RE device writes described RE device in described uplink frame identity information comprises: described RE device judges whether the value that carry in predefined territory in the described uplink frame is the initial value that described ONU writes in advance, if then the identity information with described RE device writes described territory;

Described OLT determines that according to described identity information the nearest active equipment of the described ONU of EPON middle distance comprises: described OLT judges whether the value of carrying in described territory is described initial value, if, determine that then the nearest described active equipment of the described ONU of distance is described OLT, otherwise, determine that the nearest described active equipment of the described ONU of distance is the corresponding RE device of identity information that carries with described territory.

4. method according to claim 2 is characterized in that,

Described RE device writes described RE device in described uplink frame identity information comprises: described RE device is determined in the described uplink frame in the predefined territory zone corresponding to described RE device, and the identity information of described RE is write described zone;

Described OLT determines that according to described identity information the nearest active equipment of the described ONU of EPON middle distance comprises: the identity information that described OLT carries according to each zone in the described territory is determined the nearest active equipment of the described ONU of distance.

5. method according to claim 4 is characterized in that,

Described RE device is determined in the described uplink frame in the predefined territory before the zone corresponding to described RE device, also comprise: described ONU writes first area in the described territory with predefined first value, and predefined second value is write second area to the n zone in the described territory; Wherein, n is the quantity in the zone that comprises in the described territory;

Described RE device determines in the described uplink frame that the zone corresponding to described RE device comprises in the predefined territory: described RE device determine the zone corresponding to described RE device be the described first area of described regional middle distance recently and the value of carrying be the zone of described second value;

The identity information that described OLT carries according to each zone in the described territory determines that the nearest active equipment of the described ONU of distance comprises: described OLT judges whether the value of carrying in nearest zone, the described first area of middle distance, described territory is described second value, if, determine that then the nearest described active equipment of the described ONU of distance is described OLT, otherwise, determine the RE device of the identity information correspondence that the nearest described active equipment of the described ONU of distance carries for distance nearest zone, described first area.

6. method according to claim 4 is characterized in that,

Described RE device is determined in the described uplink frame in the predefined territory before the zone corresponding to described RE device, also comprise: described ONU writes n zone, first area to the in the described territory with predefined first value, wherein, n is the quantity in the zone that comprises in the described territory;

Described RE device determines in the described uplink frame that the zone corresponding to described RE device comprises in the predefined territory: described RE device judges whether the value of carrying described first area is described first value, if, determine that then the zone corresponding to described RE device is described first area, otherwise, determine zone corresponding to described RE device be the described first area of described regional middle distance recently and the value of carrying be the zone of described first value;

The identity information that described OLT carries according to each zone in the described territory determines that the nearest active equipment of the described ONU of distance comprises: described OLT judges whether the value of carrying described first area is described first value, if, determine that then the nearest described active equipment of the described ONU of distance is described OLT, otherwise, determine that the nearest described active equipment of the described ONU of distance is the RE device of the described first area identity information correspondence of carrying.

7. according to each described method in the claim 3 to 6, it is characterized in that, in the described uplink frame predefined territory comprise following one of at least: in upstream physical layer expense territory newly-increased territory, in the GEM frame head newly-increased territory, upstream physical layer Operations,Administration And Maintenance PLOAMu territory, payload field.

8. method according to claim 1 is characterized in that, the identity information that OLT obtains the RE device of described OLT indicated in the uplink frame from ONU to the path of described ONU comprises:

Described RE device writes the identity information of described RE device in described OLT is sent to the downlink frame of described ONU;

Described ONU is carried at described identity information and is sent to described OLT in the described uplink frame;

9. method according to claim 8 is characterized in that,

Described RE device writes described RE device in described OLT is sent to the downlink frame of described ONU identity information comprises: described RE device writes the identity information of described RE device in predefined first territory in described downlink frame;

Described ONU is carried at described identity information and is sent to described OLT in the described uplink frame and comprises: the value that described ONU carries described first territory writes in the described uplink frame and is sent to described OLT in predefined second territory;

Described OLT determines that according to described identity information the nearest active equipment of the described ONU of EPON middle distance comprises: described OLT judges whether the value of carrying in described second territory is the initial value that described OLT writes in advance, if, determine that then the nearest described active equipment of the described ONU of distance is described OLT, otherwise, determine that the nearest described active equipment of the described ONU of distance is the corresponding RE device of identity information that carries with described second territory.

10. method according to claim 8 is characterized in that,

Described RE device writes described RE device in described OLT is sent to the downlink frame of described ONU identity information comprises: described RE device is determined in the described downlink frame in predefined first territory zone corresponding to described RE device, and the identity information of described RE is write described zone;

Described ONU is carried at described identity information and is sent to described OLT in the described uplink frame and comprises: the value that described ONU carries each zone in described first territory writes in the respective regions in predefined second territory in the described uplink frame and is sent to described OLT;

Described OLT determines that according to described identity information the nearest active equipment of the described ONU of EPON middle distance comprises: the identity information that described OLT carries according to each zone in described second territory is determined the nearest active equipment of the described ONU of distance.

11. method according to claim 10 is characterized in that,

Described RE device is determined in the described downlink frame in predefined first territory before the zone corresponding to described RE device, also comprise: described OLT writes first area in described first territory with predefined first value, and predefined second value write second area to the n zone in described first territory, wherein, n is the quantity in the zone that comprises in described first territory;

Described RE device determines in the described downlink frame that the zone corresponding to described RE device comprises in predefined first territory: described RE device determine corresponding to the zone of described RE device for each described first area of regional middle distance recently and the value of carrying be the zone of described second value;

The identity information that described OLT carries according to each zone in described second territory determines that the nearest active equipment of the described ONU of distance comprises: described OLT judges whether the value of carrying in the nearest zone, middle distance first area, described second territory is described second value, if, determine that then the nearest described active equipment of the described ONU of distance is described OLT, otherwise, determine the nearest described active equipment of the described ONU of distance for the described first area of distance farthest and the RE device of the value of the carrying identity information correspondence of not carrying for the zone of described first value.

12. method according to claim 10 is characterized in that,

Described RE device is determined in the described downlink frame in predefined first territory before the zone corresponding to described RE device, also comprise: described OLT writes n zone, first area to the in described first territory with predefined first value, wherein, n is the quantity in the zone that comprises in described first territory;

Described RE device determines in the described downlink frame that the zone corresponding to described RE device comprises in predefined first territory: described RE device judges whether the value of carrying described first area is described first value, if, determine that then the zone corresponding to described RE device is described first area, otherwise, determine zone corresponding to described RE device be the described first area of described regional middle distance recently and the value of carrying be the zone of described first value;

The identity information that described OLT carries according to each zone in described second territory determines that the nearest active equipment of the described ONU of distance comprises: described OLT judges whether the value of carrying the described first area in described second territory is described first value, if, determine that then the nearest described active equipment of the described ONU of distance is described OLT, otherwise, determine the nearest described active equipment of the described ONU of distance be middle distance first area, described second territory farthest and the RE device of the value of the carrying identity information correspondence of not carrying for the zone of described first value.

13. according to each described method in the claim 9 to 12, it is characterized in that, described first territory comprise following one of at least: in downlink physical controll block PCBd territory newly-increased territory, in the GEM frame head newly-increased territory, down physical layer Operations,Administration And Maintenance PLOAMd territory, payload field; Described second territory comprise following one of at least: in upstream physical layer expense territory newly-increased territory, in the GEM frame head newly-increased territory, upstream physical layer Operations,Administration And Maintenance PLOAMu territory, payload field.

14. method according to claim 1 is characterized in that, described OLT determines according to described identity information also to comprise after the nearest active equipment of the described ONU of EPON middle distance:

Described OLT is sent to described ONU with the Output optical power of described active equipment;

The luminous power that Output optical power and the described ONU of described ONU by more described active equipment receives obtains the loss value of the optical link between described active equipment and the described ONU.

15. definite method of a passive optical network topological structure is characterized in that, may further comprise the steps:

The RE device is monitored the uplink frame that ONU is sent to OLT, the sign of obtaining and storing described ONU from described uplink frame;

Described OLT obtains described sign from described RE device, and determines the nearest active equipment of the described ONU of EPON middle distance according to described sign, and wherein, described active equipment comprises described RE device or described OLT.

16. method according to claim 15 is characterized in that, described OLT determines that according to described sign the nearest active equipment of the described ONU of EPON middle distance comprises:

Described OLT judges whether the sign of i ONU does not belong to the sign of obtaining from any RE device, if, then described i the nearest active equipment of ONU of judging distance is described OLT, otherwise, from all RE devices, selection stores the RE device of quantity minimum of the sign of the sign of described i ONU and storage, and the RE device of selecting is defined as the nearest described active equipment of described i the ONU of distance, wherein, i=1, ..., N, and N is the quantity of the ONU that comprises in the described EPON.

17. method according to claim 15 is characterized in that, described OLT obtains described sign from described RE device, and determines also to comprise after the nearest active equipment of the described ONU of EPON middle distance according to described sign:

18. a passive optical network topological structure is fixed system really, comprises OLT, ONU and RE device, it is characterized in that described OLT comprises:

Acquisition module is used for obtaining the identity information of the RE device of the indicated described OLT of uplink frame to the path of described ONU;

Determination module is used for determining the nearest active equipment of the described ONU of EPON middle distance according to described identity information that wherein, described active equipment comprises described RE device or described OLT.

19. system according to claim 18 is characterized in that, described RE device comprises: first writing module is used for writing in described uplink frame the identity information of described RE device.

20. system according to claim 18 is characterized in that, described RE device comprises: second writing module is used for writing in the downlink frame that described OLT is sent to described ONU the identity information of described RE device; Described ONU comprises: configuration module is used for described identity information is carried at described uplink frame; Sending module is used for described uplink frame is sent to described OLT.

21. a passive optical network topological structure is fixed system really, comprises OLT, ONU and RE device, it is characterized in that,

Described RE device comprises:

Monitor module, be used to monitor the uplink frame that ONU is sent to OLT;

Acquisition module is used for the sign that described ONU was obtained and stored to described uplink frame;

Described OLT comprises:

Acquisition module is used for obtaining described sign from described RE device;

Determination module is used for determining the nearest active equipment of the described ONU of EPON middle distance according to described sign that wherein, described active equipment comprises described RE device or described OLT.