CN102082976A - Method and system for sending data in passive optical network (PON) - Google Patents
Method and system for sending data in passive optical network (PON) Download PDFInfo
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Abstract
The invention discloses a method and system for sending data in a passive optical network (PON). In the method, when an optical line terminal (OLT) sends messages needing to be responded by an optical network unit (ONU) to the ONU, uplink bandwidth is allocated for the ONU; and the ONU sends the responded messages to the OLT in accordance with the allocated uplink bandwidth. According to the invention, the ONU can respond to the messages sent by the OLT in real time, and the communication quality between the OLT and the ONU can be improved.
Description
Technical field
The present invention relates to the communications field, relate in particular to the method and system that data send in a kind of EPON.
Background technology
Gigabit passive optical network (Gigabit-Capable Passive Optical Network, abbreviating GPON as) technology is EPON (Passive Optical Network, abbreviate PON as) important techniques branch in the family, with other PON technology type seemingly, GPON also is a kind of passive light access technology that adopts some the multidrop topology structure.
The topological structure of GPON system 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.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 GPON system, OLT is called downlink frame to the frame that ONU sends, and ONU is called uplink frame to the frame that OLT sends.As shown in Figure 2, downlink frame is by downlink physical controll block (Physical Control Block downstream, PCBd) and payload two parts form, wherein PCBd is by physics synchronization field (Psync, Physical Synchronization), Ident (identification) territory, PLOAMd territory (Physical Layer OAM downstream, down physical layer OAM (Operation, Administraion ﹠amp; Maintenance, operation, management and maintenance)), bit interleaved parity territory (BIP, Bit Interleaved Parity), information payload length field (Plend, Payload Length downstream) and upstream bandwidth mapping territory (US BWmap) form, wherein US BWmap territory is made up of N distribution structure (Allocation Structure), each distribution structure is by Alloc-ID territory (Allocation Identifier, the allocated bandwidth sign, generally be T-CONT (Transmission Container, transmission container) sign), Flags territory (the option of allocated bandwidth, 12 bits, bit 11-0, wherein bit 10 is used for notifying ONU to send PLOAM message at this upstream bandwidth, bit 6-0 is for keeping), StartTime territory (bandwidth zero-time), StopTime territory (bandwidth concluding time) and CRC territory (Cyclic Redundancy Check, cyclic redundancy check (CRC) code) are formed.ONU receives after OLT sends to the Allocation Structure of oneself, and the StartTime in Allocation Structure begins to send data, and stops to send data at StopTime.
The message that OLT sends to ONU in downlink frame comprises PLOAMd message and ONU management and control interface (OMCI) message, wherein, PLOAMd message comprises Upstream_overhead parameters (up expense parameter) message, Extended_Burst_Length (expansion burst length) message, Assign_ONU-ID (distributing the ONU sign) message etc., OMCI message is arranged in payload, comprises establishment (Create) message etc.
In existing related techniques, be independent the transmission between message that OLT sends to ONU and the Allocation Structure, promptly there is not necessary relation between PLOAMd message or OMCI message and the Allocation Structure.When OLT sends the message that needs the ONU answer to ONU, OLT divides for immediately described ONU and is used in the Allocation Structure that ONU transmits a reply message, perhaps OLT divides for described ONU and is used in the Allocation Structure that ONU transmits a reply message, cause ONU not have in time to reply the message that OLT sends, perhaps ONU can not reply the message that OLT sends.For example: in ONU registration activation, lack ONU to the Upstream_overhead parameters message (perhaps OLT is to the Upstream__overhead parameters message and the Extended_Burst_Length message of ONU transmission) of OLT transmission and the answer mechanism of Assign_ONU-ID message, do not provide in the existing related techniques about solution of the above problems.
Summary of the invention
The technical problem to be solved in the present invention is exactly to propose the method and system that data send in a kind of EPON, and ONU can not in time reply or can not reply the problem of the message of OLT transmission in the solution GPON system.
In order to solve the problems of the technologies described above, the invention provides the method that data send in a kind of EPON, comprising:
When optical line terminal (OLT) sends the message that needs described ONU answer to optical network unit (ONU), be that described ONU distributes upstream bandwidth;
Described ONU transmits a reply message to described OLT according to the upstream bandwidth of described distribution.
Further, said method also can have following characteristics:
The message that needs ONU to reply that described OLT sends to ONU is down physical layer operation management maintain (PLOAMd) and/or ONU management and control interface (OMCI) message.
Further, said method also can have following characteristics:
Described OLT sends the message that needs answer and is used for the distribution structure that ONU replys described message to ONU in same downlink frame, is that described ONU distributes upstream bandwidth in described distribution structure.
Further, said method also can have following characteristics:
If described ONU does not obtain described OLT and distributes to the balanced time delay of oneself, then described method specifically comprises:
When OLT sends the message that need reply to ONU, be that described ONU distributes upstream bandwidth in the distribution structure of the downlink frame that sends described message, and be used for the quiet window that ONU transmits a reply message for described ONU opens one;
Described ONU transmits a reply message to described OLT in described quiet window according to described upstream bandwidth.
Further, said method also can have following characteristics:
If described ONU has obtained described OLT and distributed to the balanced time delay of oneself, then described method specifically comprises:
When OLT sends the message that needs answer to ONU, be that described ONU distributes upstream bandwidth in the distribution structure of the downlink frame that sends described message;
Described ONU transmits a reply message to described OLT in described upstream bandwidth.
Further, said method also can have following characteristics:
The message that the described ONU of needs replys is up expense parameter message, perhaps, is up expense parameter message and expansion burst length message, and described OLT is that the distribution structure of ONU distribution upstream bandwidth is a serial number request, and described method specifically comprises:
OLT periodically sends up expense parameter message, perhaps, periodically sends up expense parameter message and expansion burst length message; And, the request of transmitting Sequence Number in same downlink frame, and be that open one of described ONU is used for the quiet window that ONU transmits a reply message;
The ONU of unregistered activation intercepts and obtains the parameter configuration in the up expense parameter message that OLT sends, and perhaps, intercepts and obtain the parameter configuration in up expense parameter message and the expansion burst length message; And after receiving described serial number request, in described quiet window, respond the ONU serial number message to described OLT according to described serial number request.
Further, said method also can have following characteristics:
The message that the described ONU of needs replys is up expense parameter message, perhaps, is up expense parameter message and expansion burst length message, and described method specifically comprises:
OLT periodically sends up expense parameter message, perhaps, periodically sends up expense parameter message and expansion burst length message; And, be that described ONU distributes upstream bandwidth in same downlink frame, and be used for the quiet window that ONU transmits a reply message for described ONU opens one;
The ONU of unregistered activation intercepts and obtains the parameter configuration in the up expense parameter message that OLT sends, and perhaps, intercepts and obtain the parameter configuration in up expense parameter message and the expansion burst length message; In described quiet window, send acknowledge message according to described upstream bandwidth to described OLT.
Further, said method also can have following characteristics:
The described message that needs ONU to reply is distribution ONU identification message, and described OLT is that the distribution structure of ONU distribution upstream bandwidth is a distance measurement request, and described method specifically comprises:
OLT sends distribution ONU identification message and distance measurement request to ONU in same downlink frame, and is used for the quiet window that ONU transmits a reply message for described ONU opens one;
Described ONU receives and obtains the ONU-ID in the distribution ONU identification message that OLT sends, and after receiving distance measurement request, according to described distance measurement request in described quiet window to OLT response ONU serial number message.
Further, said method also can have following characteristics:
The described message that needs ONU to reply is distribution ONU identification message, and described method specifically comprises:
OLT sends to ONU and distributes the ONU identification message, and, be that described ONU distributes upstream bandwidth in same downlink frame, and be used to reply the quiet window that distributes the ONU identification message for described ONU opens one;
Described ONU replys the affirmation message of having received distribution ONU identification message to OLT according to described upstream bandwidth in described quiet window.
Further, said method also can have following characteristics:
The described message that needs ONU to reply is establishment message, and described method specifically comprises:
OLT sends to ONU and creates message, and, be that described ONU distributes upstream bandwidth in same downlink frame;
Described ONU replys in described upstream bandwidth described OLT and has received the affirmation message of creating message.
In order to solve the problems of the technologies described above, the invention provides the system that data send and receive in a kind of EPON, comprise OLT and ONU,
Described OLT is used for when ONU sends the message of the described ONU answer of needs, is that described ONU distributes upstream bandwidth;
Described ONU is used for transmitting a reply message to described OLT according to described upstream bandwidth.
Further, said system also can have following characteristics:
Described OLT is further used for sending the message that needs answer and being used for the distribution structure that ONU replys described message to ONU in same downlink frame, is that described ONU distributes upstream bandwidth in described distribution structure.
By the present invention, ONU can in time reply the message that OLT sends, and has improved the communication quality between OLT and the ONU.
Description of drawings
Fig. 1 is the topological structure schematic diagram of GPON system;
Fig. 2 is the downlink frame structural representation of GPON system.
Embodiment
In the present invention, when OLT sends the message that needs described ONU answer to ONU, be that described ONU distributes upstream bandwidth; Described ONU transmits a reply message to described OLT according to the upstream bandwidth of described distribution.
Preferably, described OLT sends the message that needs answer and is used for the Allocation Structure (distribution structure) that ONU replys described message to ONU in same downlink frame, is that described ONU distributes upstream bandwidth in described Allocation Structure.
Method of the present invention can adopt but be not limited to one of following dual mode:
Mode one: at ONU do not obtain the balanced time delay that described OLT distributes to oneself (Equalization Delay, situation EqD) when activation (be ONU also unregistered):
When OLT sends the message that need reply to ONU, be that described ONU distributes upstream bandwidth in the Allocation Structure of the downlink frame that sends described message, and be used for the quiet window that ONU transmits a reply message for described ONU opens one;
Described ONU transmits a reply message to described OLT in described quiet window according to described upstream bandwidth.
Mode two: obtained the situation (being the registered activation of ONU, in running order) that described OLT distributes to the EqD of oneself at ONU:
When OLT sends the message that needs answer to ONU, be that described ONU distributes upstream bandwidth in the Allocation Structure of the downlink frame that sends described message;
Described ONU transmits a reply message to described OLT in described upstream bandwidth.
In the mode two, OLT need not the open quiet window into ONU.
Particularly, OLT can be PLOAM message and/or OMCI message to the message that needs ONU to reply that ONU sends.
Particularly, described PLOAMd message can be Upstream_overhead parameters message, perhaps, can be Upstream_overhead parameters message and Extended_Burst_Length message, described OLT is that ONU distributes the distribution structure of upstream bandwidth can be SN_Request (serial number request), and described method specifically comprises:
OLT periodically sends Upstream_overhead parameters message (perhaps, periodically sending Upstream_overhead parameters message and Extended_Burst_Length message); And, in same downlink frame, send SN_Request, and be used for the quiet window that ONU transmits a reply message for described ONU opens one;
The ONU of unregistered activation intercept and obtain in the Upstream_overheadparameters message that OLT sends parameter configuration (perhaps, intercept and obtain the parameter configuration in Upstream_overheadparameters message and the Extended_Burst_Length message), and after receiving described SN_Request, in described quiet window, show that to described OLT response Serial_Number_ONU (ONU sequence number) message (carrying the sequence number of ONU in this message) ONU has received the above-mentioned information that OLT sends according to described SN_Request.
Certainly, OLT also can send other and be used to authenticate the message of ONU and distribute upstream bandwidth, and ONU also can send other answer message and show the information of receiving that OLT sends.
Particularly, described PLOAMd message can be Upstream_overhead parameters message, perhaps, can be Upstream_overhead parameters message and Extended_Burst_Length message, and described method specifically comprises:
OLT periodically sends Upstream_overhead parameters message (perhaps, periodically sending Upstream_overhead parameters message and Extended_Burst_Length message); And, be that described ONU distributes upstream bandwidth in same downlink frame, and be used for the quiet window that ONU transmits a reply message for described ONU opens one;
The ONU of unregistered activation intercepts and obtains parameter configuration in the Upstream_overhead parameters message that OLT sends (perhaps, intercept and obtain in Upstream_overhead parameters message and the Extended_Burst_Length message parameter configuration); In described quiet window, send acknowledge message according to described upstream bandwidth to described OLT.
Certainly, OLT also can send other and be used to authenticate the message of ONU and distribute upstream bandwidth, and ONU also can send other answer message and show the Upstream_overhead parameters message (perhaps Upstream_overhead parameters message and Extended_Burst_Length message) of receiving that OLT sends.
Particularly, described PLOAMd message can be Assign_ONU-ID (distributing the ONU sign) message, and described OLT is that ONU distributes the Allocation Structure of upstream bandwidth can be Ranging_Request (distance measurement request), and described method specifically comprises:
OLT sends Assign_ONU-ID message and Ranging_Request to ONU in same downlink frame, and is used for the quiet window that ONU transmits a reply message for described ONU opens one;
Described ONU receives and obtains the ONU-ID in the Assign_ONU-ID message that OLT sends, and after receiving Ranging_Request, in described quiet window, show that to OLT response Serial_Number_ONU message (perhaps the affirmation message of ONU, perhaps other message) ONU has received the above-mentioned information that OLT sends according to described Ranging_Request.
Particularly, described PLOAMd message is Assign_ONU-ID message, and described method specifically comprises:
OLT sends Assign_ONU-ID message to ONU, and, be that described ONU distributes upstream bandwidth in same downlink frame, and be the open quiet window that is used to reply Assign_ONU-ID message of described ONU;
Described ONU replys the affirmation message (perhaps other information) of having received Assign_ONU-ID message to OLT according to described upstream bandwidth in described quiet window.
Particularly, described OMCI message is for creating (Create) message (also can be other OMCI message that needs ONU to reply), and described method specifically comprises:
OLT sends Create message (also can be other OMCI message that needs ONU to reply) to ONU, and, be that described ONU distributes upstream bandwidth in same downlink frame;
Described ONU replys the affirmation message (perhaps other information) of Create message (also can be other OMCI message that needs ONU to reply) to OLT in described upstream bandwidth.
The system that data send and receive in the EPON of the embodiment of the invention comprises OLT and ONU,
Described OLT is used for when ONU sends the message of the described ONU answer of needs, is that described ONU distributes upstream bandwidth;
Described ONU is used for transmitting a reply message to described OLT according to described upstream bandwidth.
Preferably, described OLT is further used for sending the message that needs answer and being used for the distribution structure that ONU replys described message to ONU in same downlink frame, is that described ONU distributes upstream bandwidth in described distribution structure.
Preferably, if described ONU does not obtain OLT and distributes to the balanced time delay of oneself, then OLT is further used for when ONU sends the message that needs answer, be that described ONU distributes upstream bandwidth in the distribution structure of the downlink frame that sends described message, and be used for the quiet window that ONU transmits a reply message for described ONU opens one; Described ONU is further used for transmitting a reply message to described OLT in described quiet window according to described upstream bandwidth.
Preferably, if described ONU has obtained OLT and distributed to the balanced time delay of oneself, then OLT is further used for when ONU sends the message that needs answer, is that described ONU distributes upstream bandwidth in the distribution structure of the downlink frame that sends described message; Described ONU is further used for transmitting a reply message to described OLT in described upstream bandwidth.
Preferably, OLT is further used for periodically sending Upstream_overhead parameters message, perhaps, periodically sends Upstream_overhead parameters message and Extended_Burst_Length message; And, in same downlink frame, send SN_Request, and be used for the quiet window that ONU transmits a reply message for described ONU opens one; Described ONU is further used for when unregistered activation, intercept and obtain the parameter configuration in the Upstream_overhead parameters message that OLT sends, perhaps, intercept and obtain parameter configuration in Upstream_overhead parameters message and the Extended_Burst_Length message; And after receiving described SN_Request, in described quiet window, respond Serial_Number_ONU message to described OLT according to described SN_Request.
Preferably, OLT is further used for periodically sending Upstream_overhead parameters message, perhaps, periodically sends Upstream_overhead parameters message and Extended_Burst_Length message; And, be that described ONU distributes upstream bandwidth in same downlink frame, and be used for the quiet window that ONU transmits a reply message for described ONU opens one; Described ONU is further used for when unregistered activation, intercept and obtain the parameter configuration in the Upstream_overhead parameters message that OLT sends, perhaps, intercept and obtain parameter configuration in Upstream_overhead parameters message and the Extended_Burst_Length message; In described quiet window, send acknowledge message according to described upstream bandwidth to described OLT.
Preferably, OLT is further used for sending Assign_ONU-ID message and Ranging_Request to ONU in same downlink frame, and is used for the quiet window that ONU transmits a reply message for described ONU opens one; Described ONU is further used for receiving and obtain the ONU-ID in the Assign_ONU-ID message that OLT sends, and after receiving Ranging_Request, in described quiet window, respond Serial_Number_ONU message to OLT according to described Ranging_Request.
Preferably, OLT is further used for sending Assign_ONU-ID message to ONU, and, be that described ONU distributes upstream bandwidth in same downlink frame, and be the open quiet window that is used to reply Assign_ONU-ID message of described ONU; Described ONU is further used for replying the affirmation message of self having received Assign_ONU-ID message to OLT according to described upstream bandwidth in described quiet window.
Preferably, OLT is further used for sending Create message (also can be other OMCI message that needs ONU to reply) to ONU, and, be that described ONU distributes upstream bandwidth in same downlink frame; Described ONU is further used for replying to OLT the affirmation message (perhaps other information) of Create message (also can be other OMCI message that needs ONU to reply) in described upstream bandwidth.
The present invention is described in detail below in conjunction with concrete application example.
Under the situation of not conflicting, herein embodiment and the feature among the embodiment can make up mutually.It should be noted that method and system that the present invention proposes is equally applicable to the PON of future generation system based on GPON.
Example one
In the GPON system, the registration activation of ONU is as follows:
Step 1, ONU intercepts descending GTC (GPON Transmission Convergence, the GPON Transmission Convergence) frame of OLT transmission and obtains frame synchronization;
Step 2, OLT periodically sends Upstream_overhead parameters message (perhaps OLT periodically sends Upstream_overhead parameters message and Extended_Burst_Length message) and SN_Request (serial number request) (perhaps other upstream bandwidths that are used to authenticate the message of ONU distribute) simultaneously in a downlink frame, and is used for the quiet window that ONU transmits a reply message for one of ONU opening.
Step 3, the ONU of unregistered activation intercepts and obtains the parameter configuration in the Upstream_overhead parameters message (perhaps Upstream_overhead parameters message and Extended_Burst_Length message), and distribute (perhaps other upstream bandwidths that are used to authenticate the message of ONU distribute) at the upstream bandwidth of receiving SN_Request after, according to the SN_Request that receives in described quiet window to OLT response Serial_Number_ONU (ONU sequence number) message (perhaps other message).
Wherein, comprise leading (Preample) in the uplink frame that ONU sends and delimit (Delimiter) part, the one segment protect time (Guardtime) of interval between the data of two different ONU transmissions, Upstream_overhead parameters message (perhaps Upstream_overhead parameters message and Extended_Burst_Length message) comprises this three parameters, and ONU obtains just can assemble the concurrent uplink frame of sending after these three parameters from above-mentioned message;
Step 4, after OLT receives the Serial_Number_ONU message that certain ONU sends and obtains corresponding sequence number, OLT sends Assign_ONU-ID (distributing the ONU sign) message and Ranging_Request (distance measurement request) in same downlink frame described ONU, and is that open one of described ONU is used for the quiet window that ONU transmits a reply message.
Step 5, described ONU receives the Assign_ONU-ID message and Ranging_Request that OLT sends in step 4 after, in described quiet window, respond Serial_Number_ONU message (the affirmation message of ONU or other message) to OLT according to described Ranging_Request.
Step 6, OLT receives (the affirmation message of ONU or other message) after the Serial_Number_ONU message that this ONU sends, OLT calculates range finding EqD (Equalization Delay as a result, balanced time delay) and with described EqD send to this ONU by Ranging_Time (range finding time) message, finish ONU registration activation, ONU enters operating state.
Example two
In the GPON system, the registration activation of ONU is as follows:
Step 1, ONU intercepts the descending GTC frame of OLT transmission and obtains frame synchronization;
Step 2, OLT periodically sends Upstream_overhead parameters message (perhaps OLT periodically sends Upstream_overhead parameters message and Extended_Burst_Length message) and SN_Request (perhaps other upstream bandwidths that are used to authenticate the message of ONU distribute) simultaneously in a downlink frame, and is used for the quiet window that ONU transmits a reply message for one of ONU opening.
Step 3, the ONU of unregistered activation intercepts and obtains the parameter configuration in the Upstream_overhead parameters message (perhaps Upstream_overhead parameter message and Extended_Burst_Length message), and distribute (perhaps other upstream bandwidths that are used to authenticate the message of ONU distribute) at the upstream bandwidth of receiving SN_Request after, according to the SN_Request that receives in described quiet window to OLT response Serial_Number_ONU message (perhaps other message).
Step 4 is distributed ONU-ID by sending Assign_ONU-ID message to this ONU to this ONU after OLT receives the Serial_Number_ONU message that certain ONU sends and obtains corresponding sequence number, and ONU enters ranging process;
Step 5, OLT sends Ranging_Request to this ONU, and to the open quiet window of this ONU, begins this ONU is found range;
Step 6 after this ONU receives Ranging_Request, still responds Serial_Number_ONU message to OLT in this peace and quiet window;
Step 7 after OLT receives the Serial_Number_ONU message that this ONU sends, is calculated range finding EqD and will find range as a result that EqD sends to this ONU by Ranging_Time message as a result, finishes ONU and registers activation, and ONU enters operating state.
Example three
In the GPON system, the registration activation of ONU is as follows:
Step 1, ONU intercepts the descending GTC frame of OLT transmission and obtains frame synchronization;
Step 2, ONU intercepts and obtains the parameter configuration in the Upstream_overhead parameters message that OLT periodically sends (perhaps OLT periodically send Upstream_overhead parameters message and Extended_Burst_Length message);
Step 3, the ONU of unregistered activation intercepts the SN_Request that OLT sends, and replys Serial_Number_ONU message to OLT after receiving SN_Request;
Step 4, after OLT receives the Serial_Number_ONU message that certain ONU sends and obtains corresponding sequence number, OLT sends Assign_ONU-ID message and Ranging_Request in same downlink frame described ONU, and is used for the quiet window that ONU transmits a reply message for described ONU opens one.
Step 5, described ONU receives the Assign_ONU-ID message and Ranging_Request that OLT sends in step 4 after, in described quiet window, respond Serial_Number_ONU message (the affirmation message of ONU or other message) to OLT according to described Ranging_Request.
Step 6, OLT receives (the affirmation message of ONU or other message) after the Serial_Number_ONU message that this ONU sends, OLT calculates range finding EqD and described EqD sent to this ONU by Ranging_Time message as a result, finishes ONU registration activation, and ONU enters operating state.
Example four
In the GPON system, the registration activation of ONU is as follows:
Step 1, ONU intercepts the descending GTC frame of OLT transmission and obtains frame synchronization;
Step 2, when OLT periodically sends Upstream_overhead parameters message (perhaps OLT periodically send Upstream_overhead parameters message and Extended_Burst_Length message), in same downlink frame, distribute a upstream bandwidth that is used to reply Upstream_overhead parameters message (perhaps Upstream_overhead parameters message and Extended_Burst_Length message) for described ONU, and be the open quiet window that is used to reply Upstream_overhead parameters message (perhaps Upstream_overhead parameters message and Extended_Burst_Length message) of described ONU by an Allocation structure; Described ONU intercepts and obtains the parameter configuration in the Upstream_overhead parameters message (perhaps Upstream_overhead parameters message and Extended_Burst Length message), and replys the affirmation message (perhaps other information) of self having received Upstream_overhead parameters message (perhaps Upstream_overhead parameters message and Extended_Burst_Length message) to OLT by described upstream bandwidth in described quiet window.
Step 3, the ONU of unregistered activation intercepts the SN_Request that OLT sends, and replys Serial_Number_ONU message to OLT after receiving SN_Request;
Step 4 is distributed ONU-ID by sending Assign_ONU-ID message to this ONU to this ONU after OLT receives the Serial_Number_ONU message that certain ONU sends and obtains corresponding sequence number, and ONU enters ranging process;
Step 5, OLT sends Ranging_Request to this ONU, and to the open quiet window of this ONU, begins this ONU is found range;
Step 6 after this ONU receives Ranging_Request, still responds Serial_Number_ONU message to OLT in this peace and quiet window;
Step 7 after OLT receives the Serial_Number_ONU message that this ONU sends, is calculated range finding EqD and will find range as a result that EqD sends to this ONU by Ranging_Time message as a result, finishes ONU and registers activation, and ONU enters operating state.
Example five
In the GPON system, the registration activation of ONU is as follows:
Step 1, ONU intercepts the descending GTC frame of OLT transmission and obtains frame synchronization;
Step 2, ONU intercepts and obtains the parameter configuration in the Upstream_overhead parameters message that OLT periodically sends (perhaps OLT periodically send Upstream_overhead parameters message and Extended_Burst_Length message);
Step 3, the ONU of unregistered activation intercepts the SN_Request that OLT sends, and replys Serial_Number_ONU message to OLT after receiving SN_Request;
After receiving the Serial_Number_ONU message that certain ONU sends and obtain corresponding sequence number, step 4:OLT distributes ONU-ID by sending Assign_ONU-ID message to this ONU to this ONU, OLT distributes the upstream bandwidth of replying Assign_ONU-ID message for described ONU by an Allocation structure in same downlink frame simultaneously, and is used for the quiet window that ONU replys Assign_ONU-ID message for described ONU is open; Behind the ONU-ID in described ONU reception and the acquisition Assign_ONU-ID message, in described quiet window, reply the affirmation message (perhaps other information) of self having received Assign_ONU-ID message to OLT by described upstream bandwidth.
Step 5, OLT sends Ranging_Request to this ONU, and to the open quiet window of this ONU, begins this ONU is found range;
Step 6 after this ONU receives Ranging_Request, still responds Serial_Number_ONU message to OLT in this peace and quiet window;
Step 7 after OLT receives the Serial_Number_ONU message that this ONU sends, is calculated range finding EqD and will find range as a result that EqD sends to this ONU by Ranging_Time message as a result, finishes ONU and registers activation, and ONU enters operating state.
Example six:
Step 1, ONU intercepts the descending GTC frame of OLT transmission and obtains frame synchronization;
Step 2, when OLT periodically sends Upstream_overhead parameters message (perhaps OLT periodically send Upstream_overhead parameters message and Extended_Burst_Length message), in same downlink frame, distribute a upstream bandwidth that is used to reply Upstream_overhead parameters message (perhaps Upstream_overhead parameters message and Extended_Burst_Length message) for described ONU, and be the open quiet window that is used to reply Upstream_overhead parameters message (perhaps Upstream_overhead parameters message and Extended_Burst_Length message) of described ONU by an Allocation structure; Described ONU intercepts and obtains the parameter configuration in the Upstream_overhead parameters message (perhaps Upstream_overhead parameters message and Extended_Burst_Length message), and replys the affirmation message (perhaps other information) of self having received Upstream_overhead parameters message (perhaps Upstream_overhead parameters message and Extended_Burst_Length message) to OLT by described upstream bandwidth in described quiet window.
Step 3, the ONU of unregistered activation intercepts the SN_Request that OLT sends, and replys Serial_Number_ONU message to OLT after receiving SN_Request;
After receiving the Serial_Number_ONU message that certain ONU sends and obtain corresponding sequence number, step 4:OLT distributes ONU-ID by sending Assign_ONU-ID message to this ONU to this ONU, OLT distributes the upstream bandwidth of replying Assign_ONU-ID message for described ONU by an Allocation structure in same downlink frame simultaneously, and is used for the quiet window that ONU replys Assign_ONU-ID message for described ONU is open; Behind the ONU-ID in described ONU reception and the acquisition Assign_ONU-ID message, in described quiet window, reply the affirmation message (perhaps other information) of self having received Assign_ONU-ID message to OLT by described upstream bandwidth.
Step 5, OLT sends Ranging_Request to this ONU, and to the open quiet window of this ONU, begins this ONU is found range;
Step 6 after this ONU receives Ranging_Request, still responds Serial_Number_ONU message to OLT in this peace and quiet window;
Step 7 after OLT receives the Serial_Number_ONU message that this ONU sends, is calculated range finding EqD and will find range as a result that EqD sends to this ONU by Ranging_Time message as a result, finishes ONU and registers activation, and ONU enters operating state.
Example seven:
Step 1, ONU intercepts the descending GTC frame of OLT transmission and obtains frame synchronization;
Step 2, when OLT periodically sends Upstream_overhead parameters message (perhaps OLT periodically send Upstream_overhead parameters message and Extended_Burst_Length message), in same downlink frame, distribute a upstream bandwidth that is used to reply Upstream_overhead parameters message (perhaps Upstream_overhead parameters message and Extended_Burst_Length message) for described ONU, and be the open quiet window that is used to reply Upstream_overhead parameters message (perhaps Upstream_overhead parameters message and Extended_Burst_Length message) of described ONU by an Allocation structure; Described ONU intercepts and obtains the parameter configuration in the Upstream_overhead parameters message (perhaps Upstream_overhead parameters message and Extended_Burst_Length message), and replys the affirmation message (perhaps other information) of self having received Upstream_overhead parameters message (perhaps Upstream_overhead parameters message and Extended_Burst_Length message) to OLT by described upstream bandwidth in described quiet window.
Step 3, the ONU of unregistered activation intercepts the SN_Request that OLT sends, and replys Serial_Number_ONU message to OLT after receiving SN_Request;
Step 4, after OLT receives the Serial_Number_ONU message that certain ONU sends and obtains corresponding sequence number, OLT sends Assign_ONU-ID message and Ranging_Request in same downlink frame described ONU, and is used for the quiet window that ONU transmits a reply message for described ONU opens one.
Step 5, described ONU receives the Assign_ONU-ID message and Ranging_Request that OLT sends in step 4 after, in described quiet window, respond Serial_Number_ONU message (the affirmation message of ONU or other message) to OLT according to described Ranging_Request.
Step 6, OLT receives (the affirmation message of ONU or other message) after the Serial_Number_ONU message that this ONU sends, OLT calculates range finding EqD and described EqD sent to this ONU by Ranging_Time message as a result, finishes ONU registration activation, and ONU enters operating state.
Example eight:
Step 1, ONU intercepts the descending GTC frame of OLT transmission and obtains frame synchronization;
Step 2, OLT periodically sends Upstream_overhead parameters message (perhaps OLT periodically sends Upstream_overhead parameters message and Extended_Burst_Length message) and SN_Request (perhaps other upstream bandwidths that are used to authenticate the message of ONU distribute) simultaneously in a downlink frame, and is used for the quiet window that ONU transmits a reply message for one of ONU opening.
Step 3, the ONU of unregistered activation intercepts and obtains the parameter configuration in the Upstream_overhead parameters message (perhaps Upstream_overhead parameters message and Extended_Burst_Length message), and distribute (perhaps other upstream bandwidths that are used to authenticate the message of ONU distribute) at the upstream bandwidth of receiving SN_Request after, according to the SN_Request that receives in described quiet window to OLT response Serial_Number_ONU message (perhaps other message).
After receiving the Serial_Number_ONU message that certain ONU sends and obtain corresponding sequence number, step 4:OLT distributes ONU-ID by sending Assign_ONU-ID message to this ONU to this ONU, OLT distributes the upstream bandwidth of replying Assign_ONU-ID message for described ONU by an Allocation structure in same downlink frame simultaneously, and is used for the quiet window that ONU replys Assign_ONU-ID message for described ONU is open; Behind the ONU-ID in described ONU reception and the acquisition Assign_ONU-ID message, in described quiet window, reply the affirmation message (perhaps other information) of self having received Assign_ONU-ID message to OLT by described upstream bandwidth.
Step 5, OLT sends Ranging_Request to this ONU, and to the open quiet window of this ONU, begins this ONU is found range;
Step 6 after this ONU receives Ranging_Request, still responds Serial_Number_ONU message to OLT in this peace and quiet window;
Step 7 after OLT receives the Serial_Number_ONU message that this ONU sends, is calculated range finding EqD and will find range as a result that EqD sends to this ONU by Ranging_Time message as a result, finishes ONU and registers activation, and ONU enters operating state.
Example nine:
When OLT sends Request_Password (password request) message to ONU in a downlink frame, in same downlink frame, be that described ONU distributes a upstream bandwidth of replying Request_Password message by an Allocation structure, and the bit10 in the Flags territory in the described Allocation structure put 1, indication ONU sends up PLOAM message (because this moment, ONU was in running order, the EqD of known this ONU of OLT is so need not open quiet window).
After ONU receives above-mentioned message, in the upstream bandwidth of described Allocation structure correspondence, reply Password message.
Example ten:
When OLT sends Request_Key (key request) message to ONU in a downlink frame, in same downlink frame, be that described ONU distributes a upstream bandwidth of replying Request_Key message by an Allocation structure, and the bit10 in the Flags territory in the described Allocation structure put 1, indication ONU sends up PLOAM message.
After ONU receives above-mentioned message and Allocation structure, send two Encryption_Key (encryption key) message continuously and give OLT in the upstream bandwidth of described Allocation structure correspondence, two Encryption_Key message are respectively first and the second portion of Key (key).
Example 11
During OMCI message that OLT send to need replys to ONU, in same downlink frame, be that described ONU distributes a upstream bandwidth that transmits a reply message by an Allocation structure.For example: when OLT sends establishment (Create) message to ONU, the bit6 (AK territory) in type of message (Message Type) territory of Create message is put 1, requiring described ONU to reply acknowledge message, is that described ONU distributes a upstream bandwidth of replying Create message by an Allocation structure in the downlink frame that sends Create message simultaneously.
After ONU receives above-mentioned message, in the upstream bandwidth of described Allocation structure correspondence, reply acknowledge message.
Certainly; the present invention also can have other various embodiments; under the situation that does not deviate from spirit of the present invention and essence thereof; those of ordinary skill in the art work as can make various corresponding changes and distortion according to the present invention, but these corresponding changes and distortion all should belong to the protection range of the appended claim of the present invention.
Claims (12)
1. the method that data send in the EPON comprises:
When optical line terminal (OLT) sends the message that needs described ONU answer to optical network unit (ONU), be that described ONU distributes upstream bandwidth;
Described ONU transmits a reply message to described OLT according to the upstream bandwidth of described distribution.
2. the method for claim 1 is characterized in that,
The message that needs ONU to reply that described OLT sends to ONU is down physical layer operation management maintain (PLOAMd) and/or ONU management and control interface (OMCI) message.
3. method as claimed in claim 1 or 2 is characterized in that,
Described OLT sends the message that needs answer and is used for the distribution structure that ONU replys described message to ONU in same downlink frame, is that described ONU distributes upstream bandwidth in described distribution structure.
4. method as claimed in claim 3 is characterized in that,
If described ONU does not obtain described OLT and distributes to the balanced time delay of oneself, then described method specifically comprises:
When OLT sends the message that need reply to ONU, be that described ONU distributes upstream bandwidth in the distribution structure of the downlink frame that sends described message, and be used for the quiet window that ONU transmits a reply message for described ONU opens one;
Described ONU transmits a reply message to described OLT in described quiet window according to described upstream bandwidth.
5. method as claimed in claim 3 is characterized in that,
If described ONU has obtained described OLT and distributed to the balanced time delay of oneself, then described method specifically comprises:
When OLT sends the message that needs answer to ONU, be that described ONU distributes upstream bandwidth in the distribution structure of the downlink frame that sends described message;
Described ONU transmits a reply message to described OLT in described upstream bandwidth.
6. method as claimed in claim 4 is characterized in that,
The message that the described ONU of needs replys is up expense parameter message, perhaps, is up expense parameter message and expansion burst length message, and described OLT is that the distribution structure of ONU distribution upstream bandwidth is a serial number request, and described method specifically comprises:
OLT periodically sends up expense parameter message, perhaps, periodically sends up expense parameter message and expansion burst length message; And, the request of transmitting Sequence Number in same downlink frame, and be that open one of described ONU is used for the quiet window that ONU transmits a reply message;
The ONU of unregistered activation intercepts and obtains the parameter configuration in the up expense parameter message that OLT sends, and perhaps, intercepts and obtain the parameter configuration in up expense parameter message and the expansion burst length message; And after receiving described serial number request, in described quiet window, respond the ONU serial number message to described OLT according to described serial number request.
7. method as claimed in claim 4 is characterized in that,
The message that the described ONU of needs replys is up expense parameter message, perhaps, is up expense parameter message and expansion burst length message, and described method specifically comprises:
OLT periodically sends up expense parameter message, perhaps, periodically sends up expense parameter message and expansion burst length message; And, be that described ONU distributes upstream bandwidth in same downlink frame, and be used for the quiet window that ONU transmits a reply message for described ONU opens one;
The ONU of unregistered activation intercepts and obtains the parameter configuration in the up expense parameter message that OLT sends, and perhaps, intercepts and obtain the parameter configuration in up expense parameter message and the expansion burst length message; In described quiet window, send acknowledge message according to described upstream bandwidth to described OLT.
8. method as claimed in claim 4 is characterized in that,
The described message that needs ONU to reply is distribution ONU identification message, and described OLT is that the distribution structure of ONU distribution upstream bandwidth is a distance measurement request, and described method specifically comprises:
OLT sends distribution ONU identification message and distance measurement request to ONU in same downlink frame, and is used for the quiet window that ONU transmits a reply message for described ONU opens one;
Described ONU receives and obtains the ONU-ID in the distribution ONU identification message that OLT sends, and after receiving distance measurement request, according to described distance measurement request in described quiet window to OLT response ONU serial number message.
9. method as claimed in claim 4 is characterized in that,
The described message that needs ONU to reply is distribution ONU identification message, and described method specifically comprises:
OLT sends to ONU and distributes the ONU identification message, and, be that described ONU distributes upstream bandwidth in same downlink frame, and be used to reply the quiet window that distributes the ONU identification message for described ONU opens one;
Described ONU replys the affirmation message of having received distribution ONU identification message to OLT according to described upstream bandwidth in described quiet window.
10. method as claimed in claim 3 is characterized in that,
The described message that needs ONU to reply is establishment message, and described method specifically comprises:
OLT sends to ONU and creates message, and, be that described ONU distributes upstream bandwidth in same downlink frame;
Described ONU replys in described upstream bandwidth described OLT and has received the affirmation message of creating message.
11. the system that data send and receive in the EPON comprises OLT and ONU, it is characterized in that,
Described OLT is used for when ONU sends the message of the described ONU answer of needs, is that described ONU distributes upstream bandwidth;
Described ONU is used for transmitting a reply message to described OLT according to described upstream bandwidth.
12. system as claimed in claim 11 is characterized in that,
Described OLT is further used for sending the message that needs answer and being used for the distribution structure that ONU replys described message to ONU in same downlink frame, is that described ONU distributes upstream bandwidth in described distribution structure.
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