WO2011020376A1

WO2011020376A1 - Processing method in a passive optical network, system and network element for a passive optical network

Info

Publication number: WO2011020376A1
Application number: PCT/CN2010/074413
Authority: WO
Inventors: 张伟良; 耿丹
Original assignee: 中兴通讯股份有限公司
Priority date: 2009-08-20
Filing date: 2010-06-24
Publication date: 2011-02-24
Also published as: CN101998190A

Abstract

A processing method in a passive optical network, a system and network element for a passive optical network are provided by the present invention, the method includes the following steps: the OLT sends the working capability supported by itself to the ONU, and the ONU configures the working parameters of itself according to the received working capability supported by the OLT (S102); the ONU sends the working capability supported by itself to the OLT, and the OLT configures the working parameters of itself according to the received working capability supported by the ONU (S104). The communication efficiency between the OLT and the ONU is improved by the present invention.

Description

TECHNICAL FIELD The present invention relates to the field of communications, and in particular to a passive optical network (PON) for processing in a Passive Optical Network (PON) Method and passive optical network system and network element. BACKGROUND Gigabit-Capable Passive Optical Network (GPON) technology is an important technology branch in passive optical networks. Similar to other PON technologies, GPON is also a point-to-multipoint extension. Passive optical access technology of the Park structure.

The GPON is composed of an Optical Line Terminal (OLT) on the central office, an Optical Network Unit (ONU) on the user side, and an Optical Distribution Network (ODN). Use a point-to-multipoint network structure. The ODN consists of passive optical components such as single-mode fiber, optical splitter, and optical connector, providing an optical transmission medium for the physical connection between the OLT and the ONU. In order to realize the partial management function of the OLT to the ONU, the related layer defines a Physical Layer Operations (Administration and Maintenance, PLOAM) channel, and the GPON uses the PLOAM channel to transmit PLOAM messages to implement management of the transmission aggregation layer. Including ONU activation, ONU management control channel establishment, encryption configuration, key management, etc.

GPON stipulates that an OLT can only send one PLOAM message to one ONU in one downlink frame. One ONU can only send at most one PLOAM message in one uplink burst slot. When multiple ONUs are connected in a PON system, this method of transmitting PLOAM messages is relatively inefficient. When the ONU registers and switches to a redundant path, a large number of PLOAMs need to be transmitted. This low efficiency performance is particularly obvious. For this situation, the related art allows the OLT to send multiple PLOAM messages in one downlink frame, but does not determine the number of PLOAM messages sent by the OLT to the same ONU in one downlink frame, and does not determine that an ONU is in an uplink. The number of PLOAM messages that can be sent in the time slot. In addition, in the GPON system, there is a guard time (Guard time) between the uplink bandwidth allocated by the OLT to the two ONUs, and a physical layer overhead (PLOu) part of the uplink frame of the ONU. Contains Preamble and Delimiter. The GPON system should choose the appropriate length of Guard time, Preamble and Delimiter to improve the cost performance of the entire system. Longer Guard time. Preamble and Delimiter will waste the upstream bandwidth of the ONU. However, the shorter Guard time and Preamble require higher OLT and ONU optical transmitting devices and optical receiving devices, which will increase the cost of OLT and ONU. A longer Delimiter is good for the positive bound of the OLT. Based on the above factors, the length of the Preamble supported by the OLT of different manufacturers and the length of the Guard time and Delimiter supported by the ONU may be different. Finally, the GPON system should select a suitable maximum uplink bandwidth allocation number to improve the cost performance of the entire system. If the maximum uplink bandwidth allocation is too large, the number of PLOus in the uplink transmission may increase, resulting in waste of uplink bandwidth, and Will increase the hardware resources required by the ONU. If the maximum number of uplink bandwidth allocations is too small, the allocation structure in each downlink frame is small, which is not conducive to satisfying the low delay requirement of the uplink transmission service. The ONU registration activation in the related art mainly includes the following steps:

1. The ONU listens to the downlink GTC (GPON Transmission Convergence) frame sent by the OLT and acquires frame synchronization;

2, the ONU listens to the Upstream_Overhead (or Extended Burst Length) message sent by the OLT periodically and obtains the parameter configuration in the message;

3. The unregistered ONU listens to the SN_Request (serial number request;) sent by the OLT, and receives the SN Request and then responds to the OLT with the Serial Number ONU (ONU serial number) message (the message carries the serial number of the ONU);

4. After receiving the Serial_Number_ONU message sent by an ONU and obtaining the corresponding sequence number, the OLT assigns an ONU-ID to the ONU by sending an Assign_ONU-ID (Assigning ONU Identity) message;

5. The OLT sends a Ranging_Request (Ranging Request;) to the ONU, and starts ranging the ONU;

6. After receiving the Ranging Request, the ONU still responds to the OLT with a Serial Number ONU message;

7. After receiving the Serial_Number_ONU message sent by the ONU, the OLT calculates the ranging result EqD (Equalization Delay) and passes the measured result EqD through the Ranging Time. (Measure time) The message is sent to the ONU to complete the ONU registration activation process. However, during the registration activation process of the above ONU, the OLT and the ONU cannot acquire each other's working mode or working capability, which will cause the communication efficiency of the OLT and the ONU to drop. SUMMARY OF THE INVENTION The present invention has been made in view of the problem that the OLT and the ONU cannot acquire each other's working mode or working capability, and the communication efficiency of the OLT and the ONU is reduced. Therefore, the main object of the present invention is to provide a passive optical network. The method of processing in order to solve the above problem. In order to achieve the above object, in accordance with an aspect of the present invention, a method of processing in a passive optical network is provided. The method for processing in the passive optical network according to the present invention includes: the optical network terminal OLT sends the working capability supported by the optical network to the ONU of the optical network unit, and the ONU configures its working parameters according to the working capability supported by the received OLT; The ONU sends its own supported working capabilities to the OLT. The OLT configures its own working parameters according to the working capabilities supported by the received ONUs. Preferably, before the OLT sends the working capability supported by the OLT to the ONU, the method further includes: the ONU requests the OLT to send the working capability supported by the OLT; and before the ONU sends the working capability supported by the ONU to the OLT, the method further includes: Request the ONU to send the working capabilities supported by the ONU. Preferably, the ONU can request the working capability supported by the OLT in one of the following ways: Create a new message, request the working capability supported by the OLT; increase the byte of the existing message; use the existing message or part of the byte in the uplink frame Reserved domain; The OLT requests the working capacity supported by the ONU in one of the following ways: Create a new message, request the working capacity supported by the ONU; increase the bytes of the existing message; use the existing message or some bytes in the downstream frame Reserved domain. Preferably, the OLT sends the working capability supported by the OLT to the ONU, including sending in one of the following ways: creating a new message, the message is used to send the working capability supported by the OLT; adding the byte of the existing message; using the existing message or the downlink The reserved field of the partial byte in the frame, the ONU sends the working capability supported by the ONU to the OLT, including sending in one of the following ways: Creating a new message, the message is used to send the working capability supported by the ONU; adding the bytes of the existing message; Use existing messages or reserved fields of partial bytes in the upstream frame. Preferably, the foregoing working capability may include one of the following: processing the physical layer operation management maintenance message capability; burst mode overhead of the uplink frame; and the maximum uplink bandwidth allocation number. Preferably, the foregoing working parameters may include one of the following: a number of physical layer operation management and maintenance messages sent; a burst mode overhead of an uplink frame; and a maximum uplink bandwidth allocation number. Preferably, the foregoing existing message may include: a physical layer operation management maintenance message. In order to achieve the above object, according to another aspect of the present invention, a passive optical network system is provided. The passive optical network system includes: an optical network terminal OLT and an optical network unit ONU, wherein the OLT and the ONU mutually transmit the working capabilities supported by the OLT and the ONU, and the OLT and the ONU configure their own working parameters according to the received working capability supported by the other party. Preferably, the foregoing working capability includes at least one of the following: processing the physical layer operation management maintenance message capability; burst mode overhead of the uplink frame; and the maximum uplink bandwidth allocation number. Preferably, the foregoing working parameters include at least one of the following: a number of physical layer operation management and maintenance messages sent; a burst mode overhead of an uplink frame; and a maximum uplink bandwidth allocation number. In order to achieve the above object, according to another aspect of the present invention, a passive optical network element is provided. The passive optical network network element includes: a sending module, configured to send a working capability supported by the network; a receiving module, configured to receive working capability supported by other network elements; and a configuration module, configured to work according to the received other network element support Ability to configure its own parameters. Preferably, the sending module uses one of the following methods to send the working capability supported by itself: Create a new message, the message is used to send the working capability supported by the network element; increase the bytes of the existing message; use the existing message, the uplink frame, and the downlink The reserved field of a partial byte in the frame. Preferably, the sending module is specifically configured to send one of the following: the capability of processing the physical layer operation management and maintenance message; the burst mode overhead of the uplink frame; and the maximum uplink bandwidth allocation number. Preferably, the foregoing working parameters include at least one of the following: a number of physical layer operation management and maintenance messages sent; a burst mode overhead of an uplink frame; and a maximum uplink bandwidth allocation number. Through the invention, the OLT is used to send the working capability supported by the OLT to the ONU, and the ONU is based on The working capacity supported by the OLT is configured to configure its own working parameters. The ONU sends its own supported working capability to the OLT. The OLT configures its working parameters according to the working capabilities supported by the received ONU, and solves the related technologies. The OLT and the ONU cannot obtain each other's working mode or working capability, which causes the communication efficiency of the OLT and the ONU to be reduced, thereby achieving the effect of improving the communication efficiency between the OLT and the ONU. BRIEF DESCRIPTION OF THE DRAWINGS The accompanying drawings, which are set to illustrate,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,, In the drawings: FIG. 1 is a schematic diagram of a method of processing in a passive optical network according to an embodiment of the present invention; FIG. 2 is a schematic diagram of a passive optical network system according to an embodiment of the present invention; A schematic diagram of a passive optical network element according to an embodiment of the present invention. The embodiment of the present invention provides a method for processing in a passive optical network, and the method includes: OLT, in view of the related art, in which the OLT and the ONU cannot obtain each other's working mode or working capability, and the communication efficiency of the OLT and the ONU is reduced. The working capacity of the ONU is sent to the ONU, and the ONU configures its working parameters according to the received working capabilities of the OLT. The ONU sends its own supported working capabilities to the OLT. The OLT supports the working capabilities supported by the received ONUs. To configure your own working parameters. It should be noted that the embodiments in the present application and the features in the embodiments may be combined with each other without conflict. The invention will be described in detail below with reference to the drawings in conjunction with the embodiments. In accordance with an embodiment of the present invention, a method of processing in a passive optical network is provided. 1 is a schematic diagram of a method of processing in a passive optical network in accordance with an embodiment of the present invention. As shown in FIG. 1, the method includes the following steps: step S102 to step 4: S102: Step S102, the OLT sends the working capability supported by the OLT to the ONU, and the ONU is configured according to the working capability supported by the received OLT. Its own working parameters; Step S104: The ONU sends the working capability supported by the ONU to the OLT, and the OLT configures its working parameters according to the working capability supported by the received ONU. The order of the above two steps can be changed. The implementation process of the embodiment of the present invention will be described in detail below with reference to examples. The working mode and/or working ability of the OLT to the ONU to support itself can be delivered in the following manner:

1. The OLT passes the reserved field (bit 6-0) of the Flags in the bandwidth allocation structure (Allocation Structure) of the downlink frame PCBd i;

2. The OLT transmits the IDENT i or the reserved bit bit31 of the downlink frame; 3. The OLT transmits the PLEND i of the downlink frame or the second 12 bit (the original 12 bit used for transmitting the length of the ATM);

4. The OLT adds a byte by adding a byte transfer of the existing PLOAM message, for example, a PLOAM message containing an uplink overhead (Upstream_Overhead), that is, an Upstream_overhead parameter message, and the added byte is the 13th word. Section, as shown in Table 1, the OLT uses the byte to pass;

Table 1 Upstream—Overhead message format

5. The OLT passes the newly created PLOAM message, and the newly created PLOAM message is as shown in Table 2. Table 2 Ability OLT message format

The working mode and/or working ability of the ONU to support the OLT to send itself can be delivered in the following way:

1. The ONU is passed through bit 3-2 of the 12th byte in the PLOAM message (the message name Serial Number ONU ) containing the Serial Number information;

2. The ONU can also be transmitted through the IND i or bit 4-0 of the upstream frame;

3. The ONU increases the byte transfer of the existing PLOAM message. For example, in the PLOAM message containing the serial number information (Serial Number), the Serial Number ONU message is increased by one byte, and the added byte is the 13th. Byte, as shown in Table 3, the ONU uses this byte to pass

Table 3, Serial Number ONU message format

Byte number Content Description

1 11111111 or No ONU-ID has been assigned yet

ONU-ID if this ONU-ID is assigned to the ONU

2 00000001 indicates that the message type is "Serial_Number_ONU"

3 VID1 Vendor_ID byte 1

4 VID2 Vendor_ID byte 2

5th byte of VID3 Vendor_ID

6th byte of VID4 Vendor_ID

7 VSSN1 specific Vendor's serial number of the first byte

8 VSSN2 specific Vendor's serial number of the second byte

9 VSSN3 specific Vendor's serial number 3rd byte

10 VSSN4 specific Vendor serial number 4th byte

11 RRRRRRRR Random delay (MSB) of ONU (in 32-byte units) when sending this message

12 RRRRAGTT RRRR = Random Delay (LSB) of ONU when sending this message

(in 32-byte units)

A = 0

G = This ONU supports GEM transmission (G=l-support)

TT = ONU transmit optical power level mode

Ττ=οο: low power

ΤΤ=01 : Medium power

ΤΤ=10: High power

ΤΤ=11 : Reserved 13 LLLLLLLL ONU supported working methods and / or working ability

14 CRC

4. The ONU is delivered through the newly created PLOAM message, and the newly created PLOAM message is as shown in Table 4.

Table 4, Ability ONU message format

OLT and ONU can use the combination of the above various methods + the working mode and working ability of the business. Embodiment 1

The OLT and the ONU actively send the registration activation method of the working mode and/or working ability supported by the other party.

In the GPON system, during the ONU registration activation process, the OLT and the ONU negotiate their respective capabilities for processing PLOAM messages, including:

1 , the maximum number of PLOAM messages that the OLT can process in an uplink burst slot,

2, the maximum number of PLOAM messages that the ONU can process in one downlink frame. The ONU registration activation process mainly includes the following steps:

(1) The ONU listens to the downlink GTC (GPON Transmission Convergence) frame sent by the OLT and acquires frame synchronization;

(2) The ONU listens and acquires the parameter configuration periodically sent by the OLT;

(3) When the OLT sends the SN_Request to the ONU, the OLT transmits the following information to the ONU through the reserved field of Flags in the bandwidth allocation structure (Allocation Structure) of the downlink frame PCBd domain: The maximum number of PLOAM messages that the OLT can process in an upstream burst slot. When the value of bitl-0 of Flags is 00, it indicates that the ONU can send a maximum of one PLOAM message in one uplink burst slot; when the value of bitl-0 of Flags is 01, it indicates that the ONU is in an uplink burst. A maximum of two PLOAM messages can be sent in a time slot; when the value of bitl-0 of Flags is 10, it indicates that the ONU can send up to three PLOAM messages in one uplink burst slot; when the value of bitl-0 of Flags When it is 11, it means that the ONU can send up to four PLOAM messages in one uplink burst slot. After the unregistered ONU detects the SN_Request sent by the OLT, the ONU stores the capability parameter of the OLT to process the PLOAM message, and then the ONU responds to the OLT with the Serial_Number_ONU message, the message carries the serial number of the ONU, and the ONU passes the Serial Number ONU message. The bit 3-2 of the 12th byte is passed to the OLT with the following information: The maximum number of PLOAM messages that the current ONU can process in one downstream frame. When the value of the bit 3-2 of the 12th byte of the Serial Number ONU is 00, it indicates that the OLT can send a PLOAM message to the ONU in a downlink frame; when the lowest byte of the Serial_Number_ONU is in the value of bit 3-2 When it is 01, it indicates that the OLT can send two PLOAM messages to the ONU in one downlink frame. When the value of bit 3-2 of the lowest byte of Serial_Number_ONU is 10, it indicates that the OLT gives the ONU the maximum in one downlink frame. Three PLOAM messages can be sent; when the value of bit 3-2 of the last byte of Serial_Number_ONU is 11, it indicates that the OLT can send up to four PLOAM messages to the ONU in one downlink frame. (4) After the OLT receives the Serial_Number_ONU message sent by an ONU and obtains the corresponding sequence number, the OLT stores the PLOAM message processing capability parameter of the ONU, and assigns the ONU to the ONU by sending an Assign_ONU-ID (Assignment of ONU Identity) message. ONU-ID, enters the ranging process;

(5) The OLT sends a Ranging_Request (Ranging Request) to the ONU, and starts ranging the ONU;

(6) After receiving the Ranging Request, the ONU still responds to the OLT with a Serial Number ONU message;

(7) After receiving the Serial_Number_ONU message sent by the ONU, the OLT calculates the ranging result EqD (Equalization Delay) and sends the ranging result EqD to the ONU through the Ranging_Time (Ranging Time) message to complete the ONU registration activation process. . In this embodiment, the OLT and the ONU negotiate the PLOAM message processing capabilities supported by each other during the registration activation phase of the ONU, and the flow of activation of the ONU registration is not changed. After the negotiation process between the OLT and the ONU is completed, when the OLT sends a PLOAM message to each ONU in the downlink frame, the OLT sends a PLOAM message according to the foregoing negotiation result; when the OLT allows the ONU to send a PLOAM message in the uplink burst slot, the ONU follows the above. The result of the negotiation sends a PLOAM message. This embodiment illustrates that the four states of the two bits indicate that the OLT and the ONU can process the above four PLOAM messages at most, and can also change the definition of four states of two bits. For example, 00 indicates that two PLOAM messages can be processed. 01 indicates that 4 PLOAM messages can be processed, 10 indicates that 6 PLOAM messages can be processed, and 11 indicates that 8 PLOAM messages can be processed. It is also possible to increase the number of bits to indicate more states indicating the PLOAM message processing capabilities of the OLT and ONU. This embodiment provides that the OLT transmits its own PLOAM message processing capability through the reserved field of Flags in the bandwidth allocation structure (Allocation Structure) of the downlink frame PCBd domain. The OLT can also transmit its own PLOAM message processing capability through the reserved bit bit 31 of the IDENT field of the downlink frame. For example, when the value of bit 31 of the IDENT field is 0, it indicates that the ONU can send a maximum of one PLOAM in one uplink burst slot. Message; When the value of bit 31 of IDENT is 1, it means that the ONU can send two PLOAM messages in one uplink burst slot (it can also change the definition of two states of one bit; for example, when IDENT domain When the value of bit31 is 0, it indicates that the ONU can send no more than five PLOAM messages in one uplink burst slot. When the value of bit 31 of IDENT is 1, it indicates that the ONU is the largest in one uplink burst slot. Can send five PLOAM messages ;). The OLT can also transmit its own PLOAM message processing capability through the PLEND i of the downlink frame or the second 12bit i or the bit 9-8 of the downlink frame. When the value of the bit 9-8 of the PLEND is 00, it indicates that the ONU is in an uplink burst. A maximum of one PLOAM message can be sent in a time slot; when the value of bit 9-8 of PLEND is 01, it indicates that the ONU can send two PLOAM messages in one uplink burst slot; when the value of bit 9-8 of PLEND is 10:00, indicating that the ONU can send up to three PLOAM messages in one uplink burst slot; when the value of bit 9-8 of PLEND is 11, it indicates that the ONU can send up to four in one uplink burst slot. PLOAM message (you can also change the definition of the four states of two bits). The OLT can also pass its own supported PLOAM message processing capability through part of the bytes of the Extended Burst Length message. This embodiment shows that the ONU passes its own PLOAM message processing capability through the 12th byte of the Serial_Number_ONU information. The ONU can also pass its own PLOAM message processing capability through the bit 4-0 of the IND field of the upstream frame, if the ONU utilizes the bitO of the IND field of the upstream frame. Passing its own PLOAM message processing capability, when the value of the bitO bit of the IND is 0, it means that the OLT can send a maximum of one PLOAM message to the ONU in one downlink frame; when the value of the bitO bit of the IND is 1, it indicates that the OLT is A maximum of two PLOAM messages can be sent to the ONU in a downlink frame (the definition of two states of one bit can also be changed. For example, when the value of the bitO bit of the IND is 0, it indicates that the OLT gives the ONU in a downlink frame. A maximum of five PLOAM messages can be sent; when the value of the bit O bit of the IND is 1, it indicates that the OLT can send up to five PLOAM messages to the ONU in one downlink frame. If the ONU here uses the bit 2-0 of the IND field of the uplink frame to transmit its own PLOAM message processing capability, it can indicate the PLOAM message processing capability of more levels of ONUs, and can better represent the ONU's own PLOAM message processing capability.

The OLT can also use the downlink frame or other reserved fields of the PLOAM message to actively send the ONU to support the PLOAM message processing capability. The ONU can also use the uplink frame or other reserved fields of the PLOAM message to actively send the PLOAM message processing capability supported by the OLT.

The OLT can also add an i or transmit its own PLOAM message processing capability to the downstream frame. The ONU can also add a domain to transmit its own PLOAM message processing capability in the upstream frame. With the method of the embodiment, the OLT and the ONU can also perform various parameters in the burst mode overhead (Burst Mode Overhead) of the uplink frame of the GPON system, such as guard time, preamble and delimiter. ); OLT and ONU can also negotiate the maximum number of uplink bandwidth allocations. Embodiment 2 If the ITU standard organization plans to increase the number of PLOAM message bytes of the PON system, the OLT and the ONU can transmit the PLOAM message processing capability supported by the PLOAM message during the registration activation process of the ONU, and the ONU registration is activated. The process mainly includes the following steps: (1) The ONU listens to the downlink GTC (GPON Transmission Convergence, OLT) sent by the OLT.

GPON transmission convergence) frames and acquire frame synchronization;

(2) The OLT periodically sends an Upstream Overhead message, and the OLT increases the power by one byte in front of the last byte of the above message. The format of the Upstream_overhead message after changing ^^ is as shown in Table 5. The added byte is The 13th byte, which is used to transmit the maximum number of PLOAM messages allowed to be sent by the ONU in an uplink burst slot. ONU received the above After the Upstream overhead message, configure its own working parameters according to the contents of each byte of the above message. Table 5, Upstream—Overhead Message Format

(3) The unregistered ONU listens to the SN_Request (serial number request;) sent by the OLT, and after receiving the SN_Request, it responds to the OLT with the Serial_Number_ONU (ONU serial number) message (the message carries the serial number of the ONU), and the ONU is in the above A byte is added in front of the last byte of the message. The format of the changed Serial_Number_ONU message is as shown in Table 6. The added byte is the 13th byte, which is used to transmit the OLT in a downlink frame. Allowed for the above The ONU sends the maximum number of PLOAM messages. Table 6 Serial Number ONU message format

(4) After receiving the Serial_Number_ONU message sent by an ONU and obtaining the corresponding serial number, the OLT configures its own working parameters according to the content of the above message. The OLT assigns an ONU-ID to the ONU by sending an Assign_ONU-ID (allocation ONU identifier) message to the ONU, and enters a ranging process;

(5) The OLT sends a Ranging_Request (Ranging Request) to the ONU, and starts ranging the ONU; (6) After receiving the Ranging Request, the ONU still responds to the OLT with the Serial Number ONU message;

(7) After receiving the Serial_Number_ONU message sent by the ONU, the OLT calculates the ranging result EqD (Equalization Delay) and sends the ranging result EqD to the ONU through the Ranging_Time (Ranging Time) message to complete the ONU registration activation process. . With the method of the embodiment, the OLT and the ONU can also perform various parameters in the burst mode overhead (Burst Mode Overhead) of the uplink frame of the GPON system, such as guard time, preamble and delimiter. ); OLT and ONU can also negotiate the maximum number of uplink bandwidth allocations. Embodiment 3

The OLT and ONU can also pass their own PLOAM message processing capabilities by adding a new PLOAM message during the ONU registration activation process. The ONU registration activation mainly includes the following steps:

The ONU listens to the downlink GTC (GPON Transmission Convergence) frame sent by the OLT and acquires frame synchronization;

The PLOAM message sent by the OLT is called Upstream_Overhead. The ONU listens and obtains the parameter configuration in the Upstream Overhead message.

When the OLT sends the SN_Request to the ONU, the OLT sends a PLOAM message named PLOAM_Ability_OLT as shown in Table 7 in the downlink frame. The message is used by the OLT to transmit its own PLOAM message processing capability. The content of the first byte of the message is received. The ONU-ID of the PLOAM message, the value of the ONU-ID is 11111111, indicating that the PLOAM message is a broadcast message sent to all ONUs; the second byte indicates that the type of the PLOAM message is PLOAM Ability OLT, that is, the PLOAM message of the OLT Processing capacity; the third byte indicates the maximum number of PLOAM messages allowed to be sent by the ONU in an uplink burst slot; the meaning of the fourth to tenth bytes is undefined, which is reserved; the thirteenth word The check field of the section. The unregistered ONU listens to the SN_Request (serial number request;) sent by the OLT, and stores the content of the PLOAM_Ability_OLT message in the frame after receiving the SN_Request, and responds to the OLT with the Serial Number ONU (ONU serial number) message (which is carried in the message) There is a serial number of the ONU); Table 7 PLOAM Ability OLT message format

After receiving the Serial_Number_ONU message sent by an ONU and obtaining the corresponding sequence number, the OLT sends an ONU-ID to the ONU by sending an Assign_ONU-ID message to the ONU to enter the measurement process.

The OLT sends a ranging request to the ONU. After receiving the ranging request, the ONU sends a PLOAM message named PLOAM_Ability_ONU to the OLT as shown in Table 8. This message is used by the ONU to transmit its own PLOAM message processing capability, and the PLOAM_Ability_ONU message is first. The content of the byte is the ONU-ID of the PLOAM message; the second byte indicates that the type of the PLOAM message is PLOAM_Ability_ONU, that is, the PLOAM message processing capability of the ONU; the third byte indicates that the OLT allows in a downlink frame. The maximum number of PLOAM messages sent to this ONU; the meaning of the fourth to tenth bytes is undefined, which is reserved; the thirteenth byte check field.

PLOAM Ability ONU

After receiving the PLOAM_Ability_ONU message sent by the ONU, the OLT stores the PLOAM message processing capability of the ONU carried in the PLOAM Ability ONU message, calculates the ranging result EqD (Equalization Delay), and passes the ranging result EqD through the Ranging Time. Time) The message is sent to the ONU, completing the ONU registration activation process. With the method of the embodiment, the OLT and the ONU can also perform various parameters in the burst mode overhead (Burst Mode Overhead) of the uplink frame of the GPON system, such as Guard time. Preamble and Delimiter; OLT and ONU can also negotiate the maximum number of uplink bandwidth allocations. Embodiment 4

The OLT actively sends its own supported working mode and/or working ability. The ONU sends its own supported working mode and/or working ability at the request of the OLT.

In the GPON system, during the ONU registration activation process, the OLT can use the first embodiment, the second embodiment, and the third embodiment to send the working mode and/or working capability supported by the OLT. When the OLT sends a sequence number request to the ONU, the OLT requests the ONU's PLOAM message processing capability through the reserved field of the Flags in the Allocation Structure of the downlink frame PCBd domain. When the value of the bit 5 of the Flags is 0, it indicates that the ONU does not need to report the PLOAM message processing capability supported by the ONU. When the value of the bit 5 of the Flags is 1, it indicates that the PLOAM message processing capability supported by the ONU is required. When the ONU needs to report the PLOAM message processing capability supported by the ONU, the ONU reports its processing capability according to the first embodiment, the second embodiment, and the third embodiment, and details are not described herein again. With the method of the embodiment, the OLT and the ONU can also perform various parameters in the burst mode overhead (Burst Mode Overhead) of the uplink frame of the GPON system, such as guard time, preamble and delimiter. ); OLT and ONU can also negotiate the maximum number of uplink bandwidth allocations. Embodiment 5 In the GPON system, during the ONU registration activation process, the OLT may use the first embodiment, the second embodiment, and the third embodiment to send the working mode and/or working capability supported by the OLT. When the OLT sends a ranging request to the ONU, the OLT requests the ONU's PLOAM message processing capability through the reserved field of the Flags in the Allocation Structure of the downlink frame PCBd domain. When the value of bit 5 of Flags is 0, it indicates that the ONU does not need to report the PLOAM message processing capability supported by it; when the value of bit 5 of Flags is 1, it indicates that the ONU supports the PLOAM message processing capability supported by it. When the ONU needs to report its own supported PLOAM message processing capability, the ONU can respond to the OLT's ranging request and PLOAM message processing capability request in the following manner.

(1) When the ONU sends its own serial number information, the ONU passes its PLOAM message processing capability through the 12th byte of the Serial_Number_ONU message. (2) While the ONU sends its own serial number information, the ONU can also transmit its own PLOAM message processing capability through bit 4-0 of the IND field of the upstream frame.

(3) The ONU responds to the OLT with a Serial_Number_ONU message in the format shown in Table 6.

(4) The ONU responds to the OLT with a PLOAM message named PLOAM Ability ONU as shown in Table 8.

The ONU can also actively send the PLOAM message processing capability supported by the OLT to the OLT by using the uplink frame or other reserved fields of the PLOAM message. When the ONU needs to report the PLOAM message processing capability supported by the ONU, the ONU responds to the ranging request of the OLT and the PLOAM message capability of the ONU in the above manner, and the remaining steps are similar to the first embodiment, the second embodiment and the third embodiment. I won't go into details here. With the method of the embodiment, the OLT and the ONU can also perform various parameters in the burst mode overhead (Burst Mode Overhead) of the uplink frame of the GPON system, such as guard time, preamble and delimiter. ); OLT and ONU can also negotiate the maximum number of uplink bandwidth allocations. Embodiment 6 In this embodiment, the OLT and the ONU request each other's PLOAM message processing capability, and then the OLT and the ONU answer the other party's request.

The OLT requests the ONU's PLOAM message processing capability in the manners of the fourth embodiment and the fifth embodiment, and the ONU responds to the OLT request in the manner of the fourth embodiment and the fifth embodiment (where the ONU response does not use the ADD of the uplink frame). i or bit4). The process of the ONU requesting the PLOAM message processing capability of the OLT is described below. When the OLT sends the SN_Request to the ONU in the registration activation state, and the ONU in the registration activation state sends its own sequence number information to the OLT, the ONU requests the PLOAM message processing capability of the OLT through the IND i or the bit 4 of the uplink frame. When the value of IND i or bit 4 is 0, it indicates that the OLT does not need to send its supported PLOAM message processing capability; when the value of bit 4 of the IND field is 1, it indicates that the OLT needs to send its supported PLOAM message processing capability. When the OLT receives the sequence number information of the ONU and the value of bit 4 of the IND field of the uplink frame is 1, when the OLT sends a ranging request to the ONU, the OLT adopts the allocation structure of the downlink frame PCBd domain proposed by Embodiment 1 (Allocation). In the Structure, the reserved field bit 1-0 of Flags sends its own PLOAM message processing capability to the ONU; the OLT can also pass the IDENT i or reserved bits of the downstream frame. The bit 31 transmits its own PLOAM message processing capability; the OLT can also transmit its own PLOAM message processing capability through the bit 9-8 of the PLEND field of the downlink frame; the OLT can also respond to the ONU request by adding a new PLOAM message as shown in Table 7; It is also possible to use the downlink frame or other reserved fields of the PLOAM message to send the ONU its own supported PLOAM message processing capability. If the ITU standard organization plans to increase the number of PLOAM message bytes of the PON system, the OLT can transmit its own supported PLOAM message processing capability through the added bytes in the PLOAM message, and the OLT receives the IND of the upstream frame while the ONU is transmitting the sequence number information. When the value of bit4 of the domain is 1, when the OLT sends a PLOAM message containing the ranging time (the message name is Ranging Time) to the ONU, a byte is added in front of the last byte of the message, and the changed Ranging_Time message is sent. The format is as shown in Table 9. The added byte is the 13th byte, which is used to transmit the maximum number of PLOAM messages allowed to be sent by the ONU in an uplink burst slot. Table 9 Ranging Time message format

The OLT can also add an i or pass its own PLOAM message processing capability to the downstream frame. With the method of the embodiment, the OLT and the ONU can also perform various parameters in the burst mode overhead (Burst Mode Overhead) of the uplink frame of the GPON system, such as guard time, preamble and delimiter. ); OLT and ONU can also negotiate the maximum number of uplink bandwidth allocations. Example 7

In the GPON system, there is a guard time between the uplink bandwidth allocated by the OLT to the two ONUs. The physical layer overhead (PLOu) part of the uplink frame of the ONU includes the preamble (Preamble) and the delimiter domain (Delimiter). Wait. The specific process of negotiating the above parameters between the OLT and the ONU is as follows:

The OLT sends Upstream Overhead to all ONUs. The PLOAM message is Upstream overhead parameters. The above message contains information such as the number of preamble bits and the number of delimiter bits. After the ONUs in the registration activation state receive the above messages, they are based on these networks. The parameter is related to the configuration. When the ONU in the registration activation state sends its own serial number information to the OLT, the ONU passes the bit 3-2 of the twelfth byte in the PLOAM message (the message name is Serial Number ONU) containing the Serial Number information. A new byte is passed to the OLT with the following information: The minimum number of Guard time bytes that the current ONU can support. The bit 3 of the twelfth byte of the Serial Number information is the highest bit of the new byte, and the bit 2 of the twelfth byte of the Serial Number information is used as the second highest bit of the new byte, and the ONU uses the ten The number of bytes of the minimum Guard time supported by the bit pass. After receiving the above information, the OLT selects an appropriate Guard time value and sends it to all ONUs through the Upstream_overhead parameters message. After the ONU receives the Upstream overhead parameters message, it performs the configuration according to these network parameters. OLT and ONU spear] use the above Upstream overhead parameters and the above Serial

The Number message completes the negotiation of the Guard time, Preamble, and Delimiter bytes. In this embodiment, the OLT transmits the number of Preamble and Delimiter bytes supported by the OLT to the ONU through the Upstream overhead parameters message. The OLT may also add an i in the downlink frame or pass the Preamble word and Delimiter number supported by the OLT. The OLT may also The partial bytes are used to pass the number of Preamble and Delimiter bytes supported by the PLOAM message. The OLT can also add a new PLOAM message to support the number of Preamble and Delimiter bytes supported by itself. This implementation shows the minimum Guard time byte that the ONU can support through the lowest byte of the Serial_Number_ONU message and the new Byte time. The ONU can also add a domain in the upstream frame to support itself. The minimum number of Guard time bytes; the ONU can also increase the minimum number of Guard time bytes that a byte pass can support in a PLOAM message; the ONU can also add a new PLOAM message that itself can support the shortest Guard time bytes. In this embodiment, an OLT and an ONU actively send messages to each other to complete the Guard time. Preamble and Delimiter bytes. The OLT and the ONU can also request the Guard time. Preamble and Delimiter words supported by the other party. The number of sections, then the OLT and ONU answer the other party's request. In this embodiment, the OLT and the ONU negotiate the number of Guard time. Preamble and Delimiter bytes supported by each other, and the content of the Preamble and Delimiter can also be used by the method of the present example. Embodiment 8 The method for the OLT to negotiate with the ONU to select an appropriate maximum uplink bandwidth allocation is as follows:

In the GPON system, during the ONU registration activation process, the OLT negotiates with the ONU the maximum number of uplink bandwidths supported by the ONU, that is, the maximum number of allocation structures allocated by the OLT in one downlink frame, and then the OLT stores the negotiation result and performs the OLT at the OLT. When the uplink bandwidth is allocated, the negotiation result is performed, that is, the number of allocation structures allocated by the OLT in one downlink frame cannot exceed the maximum uplink bandwidth allocation supported by the ONU. The specific process is as follows. When the OLT sends a serial number query message to the ONU in the registered activation state, and the ONU in the registered activation state sends its own serial number information to the OLT, the ONU transmits the maximum number of bytes to the OLT itself by adding two bytes after the serial number information. The number of upstream bandwidth allocations. The OLT receives and stores the above information. When the OLT sends the uplink bandwidth allocation next time, the number of allocation structures allocated by the OLT in one downlink frame cannot exceed the value of the above information stored by all OLTs. In this embodiment, the ONU allocates the maximum uplink bandwidth allocated by the OLT to the OLT by adding two bytes after the sequence number information, and the ONU can also add a domain to support the maximum uplink bandwidth allocation supported by the domain. The ONU can also increase the maximum number of uplink bandwidth allocations supported by the byte delivery in a PLOAM message; the ONU can also increase the maximum number of uplink bandwidth allocations supported by a new PLOAM message. In this embodiment, an ONU actively sends a message to the OLT to complete the negotiation of the maximum uplink bandwidth allocation by the ONU, and the ONU supports the maximum uplink bandwidth allocation by using the OLT request and then the ONU reply. In this embodiment, the OLT and the ONU negotiate that the ONU can support the ONU during the registration activation phase. The maximum number of uplink bandwidth allocations can also be used to negotiate the maximum number of upstream bandwidth allocations that the ONU can support at other stages of the ONU. In this embodiment, the OLT and the ONU negotiate the maximum number of uplink bandwidths that the ONU can support, and the other parameters in the bandwidth allocation supported by the ONU can also be negotiated by the method in this embodiment. According to an embodiment of the present invention, a passive optical network system and a network element are provided. 2 is a schematic diagram of a passive optical network system in accordance with an embodiment of the present invention. As shown in FIG. 2, the passive optical network system includes: an OLT and an ONU, where

The OLT and the ONU send each other's working capabilities, that is, the OLT sends its own supported working capabilities to the ONU, and the ONU sends its own supported working capabilities to the OLT.

The OLT and the ONU configure their own working parameters according to the received working capabilities supported by the other party. That is, the OLT configures its working parameters according to the working capabilities supported by the received ONUs. The ONUs are configured according to the working capabilities supported by the received OLT. Its own working parameters. The working capabilities of the above system may include at least one of the following: the ability to process PLOAM messages; the burst mode overhead of the upstream frame; and the maximum number of upstream bandwidth allocations. The foregoing working parameters may include at least one of the following: a number of sent PLOAM messages; a burst mode overhead of an uplink frame; a maximum uplink bandwidth allocation number. 3 is a schematic diagram of a passive optical network element according to an embodiment of the present invention. As shown in FIG. 3, the passive optical network network element includes: a sending module 201, a receiving module 203, and a configuration module 205. Specifically, the sending module 201 is configured to send the working capability supported by the network; the receiving module 203 is configured to work by other network elements; and the configuration module 205 is configured to configure its own parameters according to the received working capabilities supported by other network elements. The foregoing sending module 201 can use one of the following methods to send the working capability supported by the user: create a PLOAM message, which is used to send the working capability supported by the network element; increase the bytes of the existing message; Reserved field of partial bytes in the upstream and downstream frames. The foregoing sending module 201 is specifically configured to send one of the following: a capability of processing a PLOAM message; a burst mode overhead of an uplink frame; and a maximum uplink bandwidth allocation number. The above working parameters include at least one of the following: the number of transmitted PLOAM messages; the burst mode overhead of the uplink frame; and the maximum uplink bandwidth allocation number. The above is only the preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes can be made to the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the scope of the present invention are intended to be included within the scope of the present invention.

Claims

Claims A method of processing in a passive optical network, characterized in that it comprises:

The optical network terminal OLT sends its own working capability to the optical network unit ONU, and the ONU configures its working parameters according to the received working capability supported by the OLT;

The ONU sends the working capability supported by the ONU to the OLT, and the OLT configures its own working parameters according to the received working capability supported by the ONU. The method of claim 1 wherein

Before the OLT sends the working capability supported by the OLT to the ONU, the method further includes:

The ONU requests the OLT to send the working capability supported by the OLT; before the ONU sends the working capability supported by the ONU to the OLT, the method further includes:

The OLT requests the ONU to send the working capability supported by the ONU. The method of claim 2, wherein

The ONU requests the working capability supported by the OLT in one of the following ways: a new message is created, the message is used to request the working capability supported by the OLT; and the bytes of the existing message are added;

Utilize an existing message or a reserved field of a partial byte in an upstream frame;

The OLT requests the working capability supported by the ONU in one of the following ways:

Create a new message, the message is used to request the working capability supported by the ONU; increase the bytes of the existing message;

Use existing messages or reserved fields of some bytes in the downstream frame.

4. The method of claim 1 wherein

The sending, by the OLT, the working capability supported by the OLT to the ONU includes sending by one of the following methods:

Create a new message, which is used to send the working capability supported by the OLT; increase the bytes of the existing message;

Utilizing an existing message or a reserved field of a partial byte in a downlink frame; the ONU transmitting its own supported working capability to the OLT includes sending by one of the following methods:

Create a new message, which is used to send the working capability supported by the ONU; increase the bytes of the existing message;

Use existing messages or reserved fields of partial bytes in the upstream frame.

The method according to any one of claims 1 to 4, characterized in that the working capability comprises one of the following:

The ability to handle physical layer operations management and maintenance messages;

Burst mode overhead of the upstream frame;

The maximum number of upstream bandwidth allocations.

The method according to any one of claims 1 to 4, characterized in that the operating parameter comprises one of the following:

The number of physical layer operations management and maintenance messages sent; the burst mode overhead of the uplink frame;

The maximum number of upstream bandwidth allocations.

The method according to any one of claims 1 to 4, wherein the existing message comprises:

The physical layer operates to manage maintenance messages.

8. A passive optical network system, comprising an optical network terminal OLT and an optical network unit ONU, wherein the OLT and the ONU mutually transmit working capabilities supported by the OLT and the ONU according to the received The working ability supported by the other party is configured to configure its own working parameters.

9. The system of claim 8, wherein the working capability comprises at least one of:

Burst mode overhead of the upstream frame;

The maximum number of upstream bandwidth allocations.

10. The system of claim 8, wherein the operating parameters comprise at least one of:

The number of physical layer operations management maintenance messages sent;

Burst mode overhead of the upstream frame;

The maximum number of upstream bandwidth allocations.

A passive optical network network element, comprising:

a sending module, configured to send a working capability supported by itself;

The receiving module is configured to receive the working capability supported by the network element of the other passive optical network, and the configuration module is configured to configure the parameter according to the working capability supported by the network element of the other passive optical network.

The network element according to claim 11, wherein the sending module sends the working capability supported by itself by using one of the following methods:

Create a new message, which is used to send the working capability supported by the network element; increase the bytes of the existing message;

A reserved field of partial bytes in existing messages, upstream frames, and downstream frames.

The network element according to claim 11, wherein the sending module is specifically configured to send one of the following:

Burst mode overhead of the upstream frame;

The maximum number of upstream bandwidth allocations.

The network element according to claim 11, wherein the operating parameter comprises at least one of the following:

The number of physical layer operations management maintenance messages sent;

Burst mode overhead of the upstream frame;

The maximum number of upstream bandwidth allocations.