CN102082976B - 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 PDF

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CN102082976B
CN102082976B CN200910207499.2A CN200910207499A CN102082976B CN 102082976 B CN102082976 B CN 102082976B CN 200910207499 A CN200910207499 A CN 200910207499A CN 102082976 B CN102082976 B CN 102082976B
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onu
message
olt
uplink
reply
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CN102082976A (en
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张伟良
耿丹
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ZTE Corp
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ZTE Corp
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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

Method and system for transmitting data in passive optical network
Technical Field
The present invention relates to the field of communications, and in particular, to a method and a system for transmitting data in a passive optical network.
Background
A Gigabit-Capable Passive Optical Network (GPON) technology is an important technical branch in a Passive Optical Network (PON) family, and similar to other PON technologies, GPON is also a Passive Optical access technology adopting a point-to-multipoint topology structure.
The topology of a GPON system is shown in fig. 1. The GPON is composed of an Optical Line Terminal (OLT) on the office side, an Optical Network Unit (ONU) on the user side, and an Optical Distribution Network (ODN), and generally adopts a point-to-multipoint Network structure. The ODN is composed of single-mode optical fibers, optical splitters, optical connectors, and other passive optical devices, and provides an optical transmission medium for physical connection between the OLT and the ONUs.
In the GPON system, a frame sent by the OLT to the ONU is called a downlink frame, and a frame sent by the ONU to the OLT is called an uplink frame. As shown in fig. 2, the downstream frame is composed of a downstream Physical control block (PCBd) and a Payload, wherein the PCBd is composed of a Physical Synchronization field (Psync), an identity field, a PLOAMd field (Physical layer OAM downlink), an Operation, administration and Maintenance (OAM)), a Bit interleaved parity field (BIP), an information Payload Length field (Plend), and an upstream bandwidth map field (US BWmap), wherein the US BWmap field is composed of N Allocation structures (allocations), each of which is composed of an Identifier field (Identifier, bandwidth Allocation Identifier, generally a T-control (Transmission control), a bandwidth Allocation Identifier (ONU) for transmitting a bandwidth Allocation message, and a bandwidth Allocation Identifier (ONU) for transmitting a notification message, wherein the ONU Identifier is composed of 0 Bit, 10 Bit Allocation Identifier (Transmission control), and the ONU Identifier is composed of 0 Bit Allocation Identifier, 10 Bit Allocation Identifier (ONU for transmitting a bandwidth Allocation message, and the ONU Identifier is composed of 0 Bit Allocation Identifier, 10 Bit Allocation Identifier for transmitting a notification message, and the ONU Identifier is composed of a notification Bit Allocation Identifier for transmitting a Payload, and the ONU Identifier is composed of 0 Bit Allocation Identifier (Transmission Identifier) and the pdu Identifier for transmitting a packet Identifier, and the pdu, A StartTime field (bandwidth start time), a StopTime field (bandwidth end time), and a CRC field (Cyclic redundancy check code). After receiving the Allocation Structure sent by the OLT to the ONU, the ONU starts sending data at StartTime in the Allocation Structure and stops sending data at StopTime.
Messages sent by the OLT to the ONUs within the downlink frame include PLOAMd messages including Upstream _ overhead parameters messages, Extended _ Burst _ Length messages, Assign _ ONU-ID messages, etc., and ONU Management and Control Interface (OMCI) messages located in the payload including Create (Create) messages, etc.
In the related art, the message sent by the OLT to the ONU and the Allocation Structure are sent independently, that is, there is no necessary association between the PLOAMd message or the OMCI message and the Allocation Structure. When the OLT sends a message which needs the ONU to reply to the ONU, the OLT does not immediately allocate an Allocation Structure for the ONU to send the reply message, or the OLT does not allocate the Allocation Structure for the ONU to send the reply message, so that the ONU does not reply to the message sent by the OLT in time, or the ONU cannot reply to the message sent by the OLT. For example: in the ONU registration activation process, there is no mechanism for the ONU to reply to the Upstream _ overhead parameters message (or the Upstream _ overhead parameters message and Extended _ Burst _ Length message sent by the OLT to the ONU) and the Assign _ ONU-ID message, and the related art does not provide a solution to the above problem.
Disclosure of Invention
The technical problem to be solved by the invention is to provide a method and a system for transmitting data in a passive optical network, and solve the problem that an ONU in a GPON system cannot reply in time or cannot reply a message transmitted by an OLT.
In order to solve the above technical problem, the present invention provides a method for transmitting data in a passive optical network, including:
when an Optical Line Terminal (OLT) sends a message needing the ONU to reply to an Optical Network Unit (ONU), allocating an uplink bandwidth for the ONU;
and the ONU sends a reply message to the OLT according to the allocated uplink bandwidth.
Further, the method can also have the following characteristics:
the message which is sent to the ONU by the OLT and needs to be replied by the ONU is a downlink physical layer operation management maintenance (PLOAMd) and/or ONU Management and Control Interface (OMCI) message.
Further, the method can also have the following characteristics:
and the OLT sends a message needing to be replied and a distribution structure used for the ONU to reply the message in the same downlink frame to the ONU, and an uplink bandwidth is distributed to the ONU in the distribution structure.
Further, the method can also have the following characteristics:
if the ONU does not obtain the equalization delay allocated to itself by the OLT, the method specifically includes:
when an OLT sends a message needing to be replied to an ONU, allocating an uplink bandwidth for the ONU in an allocation structure of a downlink frame for sending the message, and opening a quiet window for the ONU to send a reply message;
and the ONU sends a reply message to the OLT within the quiet window according to the upstream bandwidth.
Further, the method can also have the following characteristics:
if the ONU has already obtained the equalization delay allocated to itself by the OLT, the method specifically includes:
when an OLT sends a message needing to be replied to an ONU, allocating an uplink bandwidth for the ONU in an allocation structure of a downlink frame for sending the message;
and the ONU sends a reply message to the OLT in the uplink bandwidth.
Further, the method can also have the following characteristics:
the message to be replied by the ONU is an uplink overhead parameter message, or an uplink overhead parameter message and an extended burst length message, and the allocation structure for the OLT to allocate an uplink bandwidth to the ONU is a serial number request, the method specifically includes:
the OLT periodically sends an uplink overhead parameter message, or periodically sends the uplink overhead parameter message and an extended burst length message; sending a serial number request in the same downlink frame, and opening a quiet window for the ONU to send a reply message;
the ONU which is not registered and activated monitors and acquires the parameter configuration in the uplink overhead parameter message sent by the OLT, or monitors and acquires the parameter configuration in the uplink overhead parameter message and the extended burst length message; and after receiving the serial number request, responding an ONU serial number message to the OLT in the quiet window according to the serial number request.
Further, the method can also have the following characteristics:
the message to be replied by the ONU is an uplink overhead parameter message, or an uplink overhead parameter message and an extended burst length message, and the method specifically includes:
the OLT periodically sends an uplink overhead parameter message, or periodically sends the uplink overhead parameter message and an extended burst length message; allocating an uplink bandwidth to the ONU in the same downlink frame, and opening a quiet window for the ONU to send a reply message;
the ONU which is not registered and activated monitors and acquires the parameter configuration in the uplink overhead parameter message sent by the OLT, or monitors and acquires the parameter configuration in the uplink overhead parameter message and the extended burst length message; and sending a confirmation message to the OLT within the quiet window according to the upstream bandwidth.
Further, the method can also have the following characteristics:
the message requiring the ONU to reply is an allocation ONU identification message, the allocation structure for the OLT to allocate an uplink bandwidth to the ONU is a ranging request, and the method specifically includes:
the OLT sends an ONU identification message and a ranging request to the ONU in the same downlink frame, and opens a quiet window for the ONU to send a reply message;
and the ONU receives and acquires the ONU-ID in the distributed ONU identification message sent by the OLT, and responds an ONU serial number message to the OLT in the quiet window according to the ranging request after receiving the ranging request.
Further, the method can also have the following characteristics:
the message requiring the ONU reply is an ONU allocation identification message, and the method specifically comprises the following steps:
the OLT sends an ONU identification distribution message to the ONU, distributes uplink bandwidth for the ONU in the same downlink frame, and opens a quiet window for replying the ONU identification distribution message for the ONU;
and the ONU replies a confirmation message that the ONU identification message is distributed to the OLT within the quiet window according to the upstream bandwidth.
Further, the method can also have the following characteristics:
the message to be replied by the ONU is a creation message, and the method specifically comprises the following steps:
the OLT sends a creating message to the ONU, and allocates an uplink bandwidth to the ONU in the same downlink frame;
and the ONU replies a confirmation message of having received the creation message to the OLT in the upstream bandwidth.
In order to solve the above technical problems, the present invention provides a system for transmitting and receiving data in a passive optical network, comprising an OLT and ONUs,
the OLT is used for allocating an uplink bandwidth to the ONU when sending a message which needs to be replied by the ONU to the ONU;
and the ONU is used for sending a reply message to the OLT according to the uplink bandwidth.
Further, the system can also have the following characteristics:
the OLT is further configured to send a message to be replied to the ONU in the same downlink frame and a distribution structure for the ONU to reply to the message, and distribute an uplink bandwidth to the ONU in the distribution structure.
By the invention, the ONU can reply the message sent by the OLT in time, and the communication quality between the OLT and the ONU is improved.
Drawings
FIG. 1 is a schematic of the topology of a GPON system;
fig. 2 is a schematic diagram of a downlink frame structure of the GPON system.
Detailed Description
In the invention, when an OLT sends a message which needs to be replied by an ONU to the ONU, an uplink bandwidth is allocated to the ONU; and the ONU sends a reply message to the OLT according to the allocated uplink bandwidth.
Preferably, the OLT sends a message to be replied to an ONU and an Allocation Structure (Allocation Structure) for the ONU to reply to the message in the same downstream frame, and allocates an upstream bandwidth to the ONU in the Allocation Structure.
The method of the present invention can be used in, but is not limited to, one of the following two ways:
the first method is as follows: for the case that the ONU does not obtain the Equalization Delay (EqD) allocated to itself by the OLT (i.e. when the ONU is not registered and activated):
when an OLT sends a message needing to reply to an ONU, allocating an uplink bandwidth for the ONU in an Allocation Structure of a downlink frame for sending the message, and opening a quiet window for the ONU to send a reply message;
and the ONU sends a reply message to the OLT within the quiet window according to the upstream bandwidth.
The second method comprises the following steps: for the case that the ONU has obtained the EqD allocated to itself by the OLT (i.e. the ONU is registered and activated, and is in an operating state):
when an OLT sends a message needing to be replied to an ONU, allocating an uplink bandwidth for the ONU in an Allocation Structure of a downlink frame for sending the message;
and the ONU sends a reply message to the OLT in the uplink bandwidth.
In the second mode, the OLT does not need to open a quiet window for the ONU.
Specifically, the message sent by the OLT to the ONU and requiring the ONU to reply may be a PLOAM message and/or an OMCI message.
Specifically, the PLOAMd message may be an Upstream _ overhead parameters message, or may be an Upstream _ overhead parameters message and an Extended _ Burst _ Length message, and the allocation structure for the OLT to allocate the Upstream bandwidth to the ONU may be an SN _ Request (sequence number Request), where the method specifically includes:
the OLT periodically transmits an Upstream _ overhead parameters message (or periodically transmits an Upstream _ overhead parameters message and an Extended _ Burst _ Length message); and sending the SN _ Request in the same downlink frame, and opening a quiet window for the ONU to send a reply message;
the unregistered and activated ONU listens and acquires parameter configuration in an Upstream _ overhead messages sent by the OLT (or listens and acquires parameter configuration in an Upstream _ overhead messages and an Extended _ Burst _ Length message), and after receiving the SN _ Request, responds to the OLT in the quiet window according to the SN _ Request to indicate that the ONU has received the information sent by the OLT.
Of course, the OLT may also send other messages for authenticating the ONU and allocate the upstream bandwidth, and the ONU may also send other reply messages to indicate that the information sent by the OLT has been received.
Specifically, the PLOAMd message may be an Upstream _ overhead parameters message, or an Upstream _ overhead parameters message and an Extended _ Burst _ Length message, and the method specifically includes:
the OLT periodically transmits an Upstream _ overhead parameters message (or periodically transmits an Upstream _ overhead parameters message and an Extended _ Burst _ Length message); allocating an uplink bandwidth to the ONU in the same downlink frame, and opening a quiet window for the ONU to send a reply message;
the unregistered and activated ONU listens and acquires the parameter configuration in the Upstream _ overhead messages sent by the OLT (or listens and acquires the parameter configuration in the Upstream _ overhead messages and Extended _ Burst _ Length messages); and sending a confirmation message to the OLT within the quiet window according to the upstream bandwidth.
Of course, the OLT may also send other messages for authenticating the ONU and allocate the Upstream bandwidth, and the ONU may also send other reply messages indicating that the Upstream _ overhead parameters message (or the Upstream _ overhead parameters message and the Extended _ Burst _ Length message) sent by the OLT has been received.
Specifically, the PLOAMd message may be an Assign _ ONU-ID (allocate ONU identifier) message, the Allocation Structure for the OLT to allocate the upstream bandwidth to the ONU may be a Ranging _ Request (Ranging Request), and the method specifically includes:
the OLT sends an Assign _ ONU-ID message and a Ranging _ Request to the ONU in the same downlink frame, and opens a quiet window for the ONU to send a reply message;
and the ONU receives and acquires the ONU-ID in the Assign _ ONU-ID message sent by the OLT, and responds to the OLT for a Serial _ Number _ ONU message (or an ONU confirmation message or other messages) in the quiet window according to the Ranging _ Request after receiving the Ranging _ Request, wherein the Serial _ Number _ ONU message (or the ONU confirmation message or other messages) indicates that the ONU receives the information sent by the OLT.
Specifically, the PLOAMd message is an Assign _ ONU-ID message, and the method specifically includes:
the OLT sends an Assign _ ONU-ID message to the ONU, distributes an uplink bandwidth for the ONU in the same downlink frame, and opens a quiet window for replying the Assign _ ONU-ID message for the ONU;
and the ONU replies a confirmation message (or other information) that the Assign _ ONU-ID message is received to the OLT in the quiet window according to the upstream bandwidth.
Specifically, the OMCI message is a Create (Create) message (or may be an OMCI message that needs to be replied by another ONU), and the method specifically includes:
the OLT sends a Create message (which can also be an OMCI message replied by other ONUs) to the ONUs, and allocates an uplink bandwidth for the ONUs in the same downlink frame;
and the ONU replies a confirmation message (or other information) of a Create message (or other OMCI messages needing to be replied by the ONU) to the OLT in the uplink bandwidth.
The system for transmitting and receiving data in the passive optical network of the embodiment of the invention comprises an OLT and an ONU,
the OLT is used for allocating an uplink bandwidth to the ONU when sending a message which needs to be replied by the ONU to the ONU;
and the ONU is used for sending a reply message to the OLT according to the uplink bandwidth.
Preferably, the OLT is further configured to send a message to be replied to an ONU in the same downlink frame and an allocation structure for the ONU to reply to the message, and allocate an uplink bandwidth to the ONU in the allocation structure.
Preferably, if the ONU does not obtain the equalization delay allocated to itself by the OLT, the OLT is further configured to allocate an upstream bandwidth to the ONU in an allocation structure of a downstream frame for transmitting the message when transmitting the message to the ONU, and open a quiet window for the ONU to transmit the reply message; the ONU is further configured to send a reply message to the OLT within the quiet window according to the upstream bandwidth.
Preferably, if the ONU has obtained the equalization delay allocated to itself by the OLT, the OLT is further configured to allocate an uplink bandwidth to the ONU in an allocation structure of a downlink frame for transmitting the message when transmitting the message to the ONU to be replied; the ONU is further configured to send a reply message to the OLT within the upstream bandwidth.
Preferably, the OLT is further configured to periodically send an Upstream _ overhead parameters message, or periodically send an Upstream _ overhead parameters message and an Extended _ Burst _ Length message; and sending the SN _ Request in the same downlink frame, and opening a quiet window for the ONU to send a reply message; the ONU is further used for monitoring and acquiring the parameter configuration in the Upstream _ overhead parameters message sent by the OLT when the ONU is not registered and activated, or monitoring and acquiring the parameter configuration in the Upstream _ overhead parameters message and the Extended _ Burst _ Length message; and after receiving the SN _ Request, responding to a Serial _ Number _ ONU message to the OLT in the quiet window according to the SN _ Request.
Preferably, the OLT is further configured to periodically send an Upstream _ overhead parameters message, or periodically send an Upstream _ overhead parameters message and an Extended _ Burst _ Length message; allocating an uplink bandwidth to the ONU in the same downlink frame, and opening a quiet window for the ONU to send a reply message; the ONU is further used for monitoring and acquiring the parameter configuration in the Upstream _ overhead parameters message sent by the OLT when the ONU is not registered and activated, or monitoring and acquiring the parameter configuration in the Upstream _ overhead parameters message and the Extended _ Burst _ Length message; and sending a confirmation message to the OLT within the quiet window according to the upstream bandwidth.
Preferably, the OLT is further configured to send an Assign _ ONU-ID message and a Ranging _ Request to the ONU in the same downstream frame, and open a quiet window for the ONU to send a reply message; and the ONU is further used for receiving and acquiring the ONU-ID in the Assign _ ONU-ID message sent by the OLT, and responding to the Serial _ Number _ ONU message to the OLT in the quiet window according to the Ranging _ Request after receiving the Ranging _ Request.
Preferably, the OLT is further configured to send an Assign _ ONU-ID message to an ONU, allocate an upstream bandwidth to the ONU in the same downstream frame, and open a quiet window for replying with the Assign _ ONU-ID message for the ONU; the ONU is further used for replying to the OLT for a confirmation message that the Assign _ ONU-ID message is received within the quiet window according to the upstream bandwidth.
Preferably, the OLT is further configured to send a Create message (which may also be an OMCI message that needs to be replied by another ONU) to the ONU, and allocate an uplink bandwidth to the ONU in the same downlink frame; the ONU is further configured to reply to the OLT with an acknowledgement message (or other information) of a Create message (which may also be an OMCI message that needs to be replied by another ONU) within the upstream bandwidth.
The present invention will be described in detail with reference to specific application examples.
The embodiments and features of the embodiments herein may be combined with each other without conflict. It should be noted that the method and system proposed by the present invention are also applicable to GPON-based next-generation PON systems.
Example one
In the GPON system, the registration and activation process of the ONU is as follows:
step 1, an ONU monitors a downlink GTC (GPON Transmission Convergence) frame sent by an OLT and acquires frame synchronization;
step 2, the OLT periodically sends an Upstream _ overhead messages (or periodically sends an Upstream _ overhead _ parameters message and an Extended _ Burst _ Length message) and an SN _ Request (or other uplink bandwidth allocation for authenticating the ONU) simultaneously in one downlink frame, and opens a quiet window for the ONU to send a reply message.
And step 3, the unregistered and activated ONU listens and acquires the parameter configuration in the Upstream _ overhead parameters message (or the Upstream _ overhead parameters message and the Extended _ Burst _ Length message), and responds to the OLT for a Serial _ Number _ ONU (ONU Serial Number) message (or other messages) in the quiet window according to the received SN _ Request after receiving the Upstream bandwidth allocation of the SN _ Request (or the Upstream bandwidth allocation of other messages for authenticating the ONU).
The uplink frame sent by the ONU comprises a preamble (preamble) and a Delimiter (Delimiter), data sent by two different ONUs are separated by a guard time (guard), an Upstream _ overhead parameters message (or an Upstream _ overhead parameters message and an Extended _ Burst _ Length message) comprises the three parameters, and the ONU can assemble and send the uplink frame after obtaining the three parameters from the messages;
and 4, after the OLT receives the Serial _ Number _ ONU message sent by a certain ONU and obtains a corresponding Serial Number, the OLT sends an Assign _ ONU-ID message and a Ranging _ Request to the ONU in the same downlink frame, and opens a quiet window for the ONU to send a reply message.
And step 5, after receiving the Assign _ ONU-ID message and the Ranging _ Request sent by the OLT in the step 4, the ONU responds to the OLT for a Serial _ Number _ ONU message (an acknowledgement message or other messages of the ONU) in the quiet window according to the Ranging _ Request.
And 6, after receiving the Serial _ Number _ ONU message (the acknowledgement message or other messages of the ONU) sent by the ONU, the OLT calculates a Ranging result EqD (Equalization Delay) and sends the EqD to the ONU through a Ranging _ Time message, thereby completing the ONU registration and activation process and enabling the ONU to enter a working state.
Example two
In the GPON system, the registration and activation process of the ONU is as follows:
step 1, an ONU monitors a downlink GTC frame sent by an OLT and acquires frame synchronization;
step 2, the OLT periodically sends an Upstream _ overhead messages (or periodically sends an Upstream _ overhead _ parameters message and an Extended _ Burst _ Length message) and an SN _ Request (or other Upstream bandwidth allocations for messages used to authenticate the ONU) simultaneously in a downstream frame, and opens a quiet window for the ONU to send a reply message.
And step 3, the unregistered and activated ONU listens and acquires the parameter configuration in the Upstream _ overhead parameters message (or the Upstream _ overhead parameters message and the Extended _ Burst _ Length message), and responds to the OLT (the Serial _ Number _ ONU message (or other messages) in the quiet window according to the received SN _ Request after receiving the Upstream bandwidth allocation of the SN _ Request (or the Upstream bandwidth allocation of other messages for authenticating the ONU).
Step 4, the OLT receives a Serial _ Number _ ONU message sent by a certain ONU and acquires a corresponding Serial Number, then the ONU distributes an ONU-ID to the ONU by sending an Assign _ ONU-ID message, and the ONU enters a ranging process;
step 5, the OLT sends a Ranging _ Request to the ONU, opens a quiet window for the ONU and starts to measure the distance of the ONU;
step 6, the ONU still responds to the OLT for Serial _ Number _ ONU information in the quiet window after receiving the Ranging _ Request;
and 7, after receiving the Serial _ Number _ ONU message sent by the ONU, the OLT calculates a distance measurement result EqD and sends the distance measurement result EqD to the ONU through a Ranging _ Time message, thereby completing the ONU registration and activation process and enabling the ONU to enter a working state.
Example three
In the GPON system, the registration and activation process of the ONU is as follows:
step 1, an ONU monitors a downlink GTC frame sent by an OLT and acquires frame synchronization;
step 2, the ONU monitors and acquires parameter configuration in an Upstream _ overhead parameters message (or an Upstream _ overhead parameters message and an Extended _ Burst _ Length message) periodically sent by the OLT;
step 3, the unregistered and activated ONU monitors SN _ Request sent by the OLT, and responds to the OLT for Serial _ Number _ ONU information after receiving the SN _ Request;
and 4, after the OLT receives the Serial _ Number _ ONU message sent by a certain ONU and obtains a corresponding Serial Number, the OLT sends an Assign _ ONU-ID message and a Ranging _ Request to the ONU in the same downlink frame, and opens a quiet window for the ONU to send a reply message.
And step 5, after receiving the Assign _ ONU-ID message and the Ranging _ Request sent by the OLT in the step 4, the ONU responds to the OLT for a Serial _ Number _ ONU message (an acknowledgement message or other messages of the ONU) in the quiet window according to the Ranging _ Request.
And 6, after receiving the Serial _ Number _ ONU message (the confirmation message or other messages of the ONU) sent by the ONU by the OLT, the OLT calculates a Ranging result EqD and sends the EqD to the ONU through a Ranging _ Time message to complete the ONU registration and activation process, and the ONU enters a working state.
Example four
In the GPON system, the registration and activation process of the ONU is as follows:
step 1, an ONU monitors a downlink GTC frame sent by an OLT and acquires frame synchronization;
step 2, while the OLT periodically sends an Upstream _ Upstream parameters message (or an Upstream _ Upstream parameters message and an Extended _ Burst _ Length message periodically sent by the OLT), allocating an Upstream bandwidth for replying to the Upstream _ Upstream parameters message (or an Upstream _ Upstream parameters message and an Extended _ Burst _ Length message) to the ONU through an Allocation structure in the same downstream frame, and opening a quiet window for replying to the Upstream _ Upstream parameters message (or an Upstream _ Upstream parameters message and an Extended _ Burst _ Length message) to the ONU; the ONU listens and acquires parameter configuration in the Upstream _ overhead parameters message (or the Upstream _ overhead parameters message and the Extended _ Burst _ Length message), and replies an acknowledgement message (or other information) that the OLT has received the Upstream _ overhead parameters message (or the Upstream _ overhead parameters message and the Extended _ Burst _ Length message) to the OLT in the quiet window through the Upstream bandwidth.
Step 3, the unregistered and activated ONU monitors SN _ Request sent by the OLT, and responds to the OLT for Serial _ Number _ ONU information after receiving the SN _ Request;
step 4, the OLT receives a Serial _ Number _ ONU message sent by a certain ONU and acquires a corresponding Serial Number, then the ONU distributes an ONU-ID to the ONU by sending an Assign _ ONU-ID message, and the ONU enters a ranging process;
step 5, the OLT sends a Ranging _ Request to the ONU, opens a quiet window for the ONU and starts to measure the distance of the ONU;
step 6, the ONU still responds to the OLT for Serial _ Number _ ONU information in the quiet window after receiving the Ranging _ Request;
and 7, after receiving the Serial _ Number _ ONU message sent by the ONU, the OLT calculates a distance measurement result EqD and sends the distance measurement result EqD to the ONU through a Ranging _ Time message, thereby completing the ONU registration and activation process and enabling the ONU to enter a working state.
Example five
In the GPON system, the registration and activation process of the ONU is as follows:
step 1, an ONU monitors a downlink GTC frame sent by an OLT and acquires frame synchronization;
step 2, the ONU monitors and acquires parameter configuration in an Upstream _ overhead parameters message (or an Upstream _ overhead parameters message and an Extended _ Burst _ Length message) periodically sent by the OLT;
step 3, the unregistered and activated ONU monitors SN _ Request sent by the OLT, and responds to the OLT for Serial _ Number _ ONU information after receiving the SN _ Request;
and 4, step 4: after receiving a Serial _ Number _ ONU message sent by an ONU and acquiring a corresponding Serial Number, an OLT (optical line terminal) allocates an ONU-ID to the ONU by sending an Assign _ ONU-ID message, and meanwhile, the OLT allocates an uplink bandwidth for replying the Assign _ ONU-ID message to the ONU through an Allocation structure in the same downlink frame and opens a quiet window for the ONU to reply the Assign _ ONU-ID message; and after receiving and acquiring the ONU-ID in the Assign _ ONU-ID message, the ONU replies a confirmation message (or other information) that the ONU has received the Assign _ ONU-ID message to the OLT within the quiet window through the upstream bandwidth.
Step 5, the OLT sends a Ranging _ Request to the ONU, opens a quiet window for the ONU and starts to measure the distance of the ONU;
step 6, the ONU still responds to the OLT for Serial _ Number _ ONU information in the quiet window after receiving the Ranging _ Request;
and 7, after receiving the Serial _ Number _ ONU message sent by the ONU, the OLT calculates a distance measurement result EqD and sends the distance measurement result EqD to the ONU through a Ranging _ Time message, thereby completing the ONU registration and activation process and enabling the ONU to enter a working state.
Example six:
step 1, an ONU monitors a downlink GTC frame sent by an OLT and acquires frame synchronization;
step 2, while the OLT periodically sends an Upstream _ Upstream parameters message (or an Upstream _ Upstream parameters message and an Extended _ Burst _ Length message periodically sent by the OLT), allocating an Upstream bandwidth for replying to the Upstream _ Upstream parameters message (or an Upstream _ Upstream parameters message and an Extended _ Burst _ Length message) to the ONU through an Allocation structure in the same downstream frame, and opening a quiet window for replying to the Upstream _ Upstream parameters message (or an Upstream _ Upstream parameters message and an Extended _ Burst _ Length message) to the ONU; the ONU listens and acquires parameter configuration in the Upstream _ overhead parameters message (or the Upstream _ overhead parameters message and the Extended _ Burst _ Length message), and replies an acknowledgement message (or other information) that the OLT has received the Upstream _ overhead parameters message (or the Upstream _ overhead parameters message and the Extended _ Burst _ Length message) to the OLT in the quiet window through the Upstream bandwidth.
Step 3, the unregistered and activated ONU monitors SN _ Request sent by the OLT, and responds to the OLT for Serial _ Number _ ONU information after receiving the SN _ Request;
and 4, step 4: after receiving a Serial _ Number _ ONU message sent by an ONU and acquiring a corresponding Serial Number, an OLT (optical line terminal) allocates an ONU-ID to the ONU by sending an Assign _ ONU-ID message, and meanwhile, the OLT allocates an uplink bandwidth for replying the Assign _ ONU-ID message to the ONU through an Allocation structure in the same downlink frame and opens a quiet window for the ONU to reply the Assign _ ONU-ID message; and after receiving and acquiring the ONU-ID in the Assign _ ONU-ID message, the ONU replies a confirmation message (or other information) that the ONU has received the Assign _ ONU-ID message to the OLT within the quiet window through the upstream bandwidth.
Step 5, the OLT sends a Ranging _ Request to the ONU, opens a quiet window for the ONU and starts to measure the distance of the ONU;
step 6, the ONU still responds to the OLT for Serial _ Number _ ONU information in the quiet window after receiving the Ranging _ Request;
and 7, after receiving the Serial _ Number _ ONU message sent by the ONU, the OLT calculates a distance measurement result EqD and sends the distance measurement result EqD to the ONU through a Ranging _ Time message, thereby completing the ONU registration and activation process and enabling the ONU to enter a working state.
Example seven:
step 1, an ONU monitors a downlink GTC frame sent by an OLT and acquires frame synchronization;
step 2, while the OLT periodically sends an Upstream _ Upstream parameters message (or an Upstream _ Upstream parameters message and an Extended _ Burst _ Length message periodically sent by the OLT), allocating an Upstream bandwidth for replying to the Upstream _ Upstream parameters message (or an Upstream _ Upstream parameters message and an Extended _ Burst _ Length message) to the ONU through an Allocation structure in the same downstream frame, and opening a quiet window for replying to the Upstream _ Upstream parameters message (or an Upstream _ Upstream parameters message and an Extended _ Burst _ Length message) to the ONU; the ONU listens and acquires parameter configuration in the Upstream _ overhead parameters message (or the Upstream _ overhead parameters message and the Extended _ Burst _ Length message), and replies an acknowledgement message (or other information) that the OLT has received the Upstream _ overhead parameters message (or the Upstream _ overhead parameters message and the Extended _ Burst _ Length message) to the OLT in the quiet window through the Upstream bandwidth.
Step 3, the unregistered and activated ONU monitors SN _ Request sent by the OLT, and responds to the OLT for Serial _ Number _ ONU information after receiving the SN _ Request;
and 4, after the OLT receives the Serial _ Number _ ONU message sent by a certain ONU and obtains a corresponding Serial Number, the OLT sends an Assign _ ONU-ID message and a Ranging _ Request to the ONU in the same downlink frame, and opens a quiet window for the ONU to send a reply message.
And step 5, after receiving the Assign _ ONU-ID message and the Ranging _ Request sent by the OLT in the step 4, the ONU responds to the OLT for a Serial _ Number _ ONU message (an acknowledgement message or other messages of the ONU) in the quiet window according to the Ranging _ Request.
And 6, after receiving the Serial _ Number _ ONU message (the confirmation message or other messages of the ONU) sent by the ONU by the OLT, the OLT calculates a Ranging result EqD and sends the EqD to the ONU through a Ranging _ Time message to complete the ONU registration and activation process, and the ONU enters a working state.
Example eight:
step 1, an ONU monitors a downlink GTC frame sent by an OLT and acquires frame synchronization;
step 2, the OLT periodically sends an Upstream _ overhead messages (or periodically sends an Upstream _ overhead _ parameters message and an Extended _ Burst _ Length message) and an SN _ Request (or other Upstream bandwidth allocations for messages used to authenticate the ONU) simultaneously in a downstream frame, and opens a quiet window for the ONU to send a reply message.
And step 3, the unregistered and activated ONU listens and acquires the parameter configuration in the Upstream _ overhead parameters message (or the Upstream _ overhead parameters message and the Extended _ Burst _ Length message), and responds to the OLT (the Serial _ Number _ ONU message (or other messages) in the quiet window according to the received SN _ Request after receiving the Upstream bandwidth allocation of the SN _ Request (or the Upstream bandwidth allocation of other messages for authenticating the ONU).
And 4, step 4: after receiving a Serial _ Number _ ONU message sent by an ONU and acquiring a corresponding Serial Number, an OLT (optical line terminal) allocates an ONU-ID to the ONU by sending an Assign _ ONU-ID message, and meanwhile, the OLT allocates an uplink bandwidth for replying the Assign _ ONU-ID message to the ONU through an Allocation structure in the same downlink frame and opens a quiet window for the ONU to reply the Assign _ ONU-ID message; and after receiving and acquiring the ONU-ID in the Assign _ ONU-ID message, the ONU replies a confirmation message (or other information) that the ONU has received the Assign _ ONU-ID message to the OLT within the quiet window through the upstream bandwidth.
Step 5, the OLT sends a Ranging _ Request to the ONU, opens a quiet window for the ONU and starts to measure the distance of the ONU;
step 6, the ONU still responds to the OLT for Serial _ Number _ ONU information in the quiet window after receiving the Ranging _ Request;
and 7, after receiving the Serial _ Number _ ONU message sent by the ONU, the OLT calculates a distance measurement result EqD and sends the distance measurement result EqD to the ONU through a Ranging _ Time message, thereby completing the ONU registration and activation process and enabling the ONU to enter a working state.
Example nine:
when an OLT sends a Request _ Password message to an ONU in a downlink frame, an Allocation structure allocates an uplink bandwidth for replying the Request _ Password message to the ONU in the same downlink frame, and sets a bit10 of a flag field in the Allocation structure to be 1 to indicate the ONU to send an uplink PLOAM message (because the ONU is in a working state at this time, the OLT knows the EqD of the ONU, so a quiet window does not need to be opened).
And after receiving the message, the ONU replies a Password message in the uplink bandwidth corresponding to the Allocation structure.
Example ten:
when an OLT sends a Request _ Key (Key Request) message to an ONU in a downlink frame, allocating an uplink bandwidth for replying the Request _ Key message to the ONU through an Allocation structure in the same downlink frame, setting bit10 of a Flags field in the Allocation structure to be 1, and indicating the ONU to send an uplink PLOAM message.
After receiving the message and the Allocation structure, the ONU continuously sends two Encryption _ Key messages to the OLT within the uplink bandwidth corresponding to the Allocation structure, where the two Encryption _ Key messages are the first part and the second part of a Key (Key), respectively.
Example eleven
And when the OLT sends the OMCI message needing to be replied to the ONU, allocating an uplink bandwidth for sending the reply message to the ONU through an Allocation structure in the same downlink frame. For example: when OLT sends Create message to ONU, it sets bit6(AK field) of message type (MessageType) field of Create message to 1, requires the ONU to reply confirmation message, and distributes an uplink bandwidth for replying Create message to the ONU by an Allocation structure in the downlink frame sending Create message.
And after receiving the message, the ONU replies an acknowledgement message in the uplink bandwidth corresponding to the Allocation structure.
The present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof, and it should be understood that various changes and modifications can be effected therein by one skilled in the art without departing from the spirit and scope of the invention as defined in the appended claims.

Claims (5)

1. A method for data transmission in a passive optical network, comprising:
when an optical line terminal OLT sends a message needing the ONU to reply to an optical network unit ONU, an uplink bandwidth is allocated to the ONU;
the ONU sends a reply message to the OLT according to the allocated uplink bandwidth;
the OLT sends a message needing to be replied and a distribution structure used for the ONU to reply the message in the same downlink frame to the ONU, and an uplink bandwidth is distributed to the ONU in the distribution structure;
if the ONU does not obtain the equalization delay allocated to itself by the OLT, the method specifically includes:
when an OLT sends a message needing to be replied to an ONU, allocating an uplink bandwidth for the ONU in an allocation structure of a downlink frame for sending the message, and opening a quiet window for the ONU to send a reply message;
the ONU sends a reply message to the OLT within the quiet window according to the upstream bandwidth; wherein,
the message to be replied by the ONU is an uplink overhead parameter message, or an uplink overhead parameter message and an extended burst length message, and the allocation structure for the OLT to allocate an uplink bandwidth to the ONU is a serial number request, the method specifically includes:
the OLT periodically sends an uplink overhead parameter message, or periodically sends the uplink overhead parameter message and an extended burst length message; sending a serial number request in the same downlink frame, and opening a quiet window for the ONU to send a reply message;
the ONU which is not registered and activated monitors and acquires the parameter configuration in the uplink overhead parameter message sent by the OLT, or monitors and acquires the parameter configuration in the uplink overhead parameter message and the extended burst length message; after receiving the serial number request, responding an ONU serial number message to the OLT in the quiet window according to the serial number request; or,
the message to be replied by the ONU is an uplink overhead parameter message, or an uplink overhead parameter message and an extended burst length message, and the method specifically includes:
the OLT periodically sends an uplink overhead parameter message, or periodically sends the uplink overhead parameter message and an extended burst length message; allocating an uplink bandwidth to the ONU in the same downlink frame, and opening a quiet window for the ONU to send a reply message;
the ONU which is not registered and activated monitors and acquires the parameter configuration in the uplink overhead parameter message sent by the OLT, or monitors and acquires the parameter configuration in the uplink overhead parameter message and the extended burst length message; sending an acknowledgement message to the OLT within the quiet window according to the upstream bandwidth; or,
the message requiring the ONU to reply is an allocation ONU identification message, the allocation structure for the OLT to allocate an uplink bandwidth to the ONU is a ranging request, and the method specifically includes:
the OLT sends an ONU identification message and a ranging request to the ONU in the same downlink frame, and opens a quiet window for the ONU to send a reply message;
the ONU receives and acquires an ONU-ID in an ONU allocation identification message sent by the OLT, and responds an ONU serial number message to the OLT in the quiet window according to a ranging request after receiving the ranging request; or,
the message requiring the ONU reply is an ONU allocation identification message, and the method specifically comprises the following steps:
the OLT sends an ONU identification distribution message to the ONU, distributes uplink bandwidth for the ONU in the same downlink frame, and opens a quiet window for replying the ONU identification distribution message for the ONU;
and the ONU replies a confirmation message that the ONU identification message is distributed to the OLT within the quiet window according to the upstream bandwidth.
2. The method of claim 1,
and the message which is sent to the ONU by the OLT and needs to be replied by the ONU is a downlink physical layer operation management maintenance PLOAMd and/or an ONU management and control interface OMC message.
3. The method of claim 1,
if the ONU has already obtained the equalization delay allocated to itself by the OLT, the method specifically includes:
when an OLT sends a message needing to be replied to an ONU, allocating an uplink bandwidth for the ONU in an allocation structure of a downlink frame for sending the message;
and the ONU sends a reply message to the OLT in the uplink bandwidth.
4. The method of claim 1,
the message to be replied by the ONU is a creation message, and the method specifically comprises the following steps:
the OLT sends a creating message to the ONU, and allocates an uplink bandwidth to the ONU in the same downlink frame;
and the ONU replies a confirmation message of having received the creation message to the OLT in the upstream bandwidth.
5. A system for transmitting and receiving data in a passive optical network, comprising an OLT and an ONU,
the OLT is used for allocating an uplink bandwidth to the ONU when sending a message which needs to be replied by the ONU to the ONU;
the ONU is used for sending a reply message to the OLT according to the uplink bandwidth;
the OLT is further used for sending a message needing to be replied to the ONU in the same downlink frame and a distribution structure used for the ONU to reply the message, and an uplink bandwidth is distributed to the ONU in the distribution structure;
if the ONU does not obtain the equalization delay allocated to itself by the OLT, the OLT and the ONU are specifically configured to:
the OLT is used for allocating an uplink bandwidth to the ONU in an allocation structure of a downlink frame for sending the message and opening a quiet window for the ONU to send a reply message when sending the message needing reply to the ONU;
the ONU is used for sending a reply message to the OLT within the quiet window according to the upstream bandwidth; wherein,
the message to be replied by the ONU is an uplink overhead parameter message, or an uplink overhead parameter message and an extended burst length message, the OLT is configured to allocate an uplink bandwidth to the ONU with a serial number request, and the OLT and the ONU are specifically configured to:
the OLT periodically sends an uplink overhead parameter message, or periodically sends the uplink overhead parameter message and an extended burst length message; sending a serial number request in the same downlink frame, and opening a quiet window for the ONU to send a reply message;
the unregistered and activated ONU is used for monitoring and acquiring parameter configuration in an uplink overhead parameter message sent by the OLT, or monitoring and acquiring parameter configuration in the uplink overhead parameter message and an extended burst length message; after receiving the serial number request, responding an ONU serial number message to the OLT in the quiet window according to the serial number request; or,
the message to be replied by the ONU is an uplink overhead parameter message, or an uplink overhead parameter message and an extended burst length message, and the OLT and the ONU are specifically configured to:
the OLT periodically sends an uplink overhead parameter message, or periodically sends the uplink overhead parameter message and an extended burst length message; allocating an uplink bandwidth to the ONU in the same downlink frame, and opening a quiet window for the ONU to send a reply message;
the unregistered and activated ONU is used for monitoring and acquiring parameter configuration in an uplink overhead parameter message sent by the OLT, or monitoring and acquiring parameter configuration in the uplink overhead parameter message and an extended burst length message; sending an acknowledgement message to the OLT within the quiet window according to the upstream bandwidth; or,
the message to be replied by the ONU is an allocation ONU identification message, the allocation structure for the OLT to allocate an uplink bandwidth to the ONU is a ranging request, and the OLT and the ONU are specifically configured to:
the OLT sends an ONU identification message and a ranging request to the ONU in the same downlink frame, and opens a quiet window for the ONU to send a reply message;
the ONU is used for receiving and acquiring an ONU-ID in an ONU allocation identification message sent by the OLT, and responding an ONU serial number message to the OLT in the quiet window according to the ranging request after receiving the ranging request; or,
the message requiring the ONU to reply is an allocation ONU identification message, and the OLT and the ONU are specifically configured to:
the OLT is used for sending an ONU identification distribution message to the ONU, distributing an uplink bandwidth for the ONU in the same downlink frame, and opening a quiet window for replying the ONU identification distribution message for the ONU;
and the ONU is used for replying a confirmation message that the ONU identification message is distributed is received to the OLT in the quiet window according to the upstream bandwidth.
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