WO2007147365A1

WO2007147365A1 - A method for measuring the performance parameter of the passive optical network on line and a system, device thereof

Info

Publication number: WO2007147365A1
Application number: PCT/CN2007/070125
Authority: WO
Inventors: Hai Gao
Original assignee: Huawei Technologies Co., Ltd.
Priority date: 2006-06-16
Filing date: 2007-06-15
Publication date: 2007-12-27
Also published as: CN101047451B; CN101047451A

Abstract

A method is used for measuring PON performance parameter on line, the procedure of measuring the PON performance parameter on line is controlled and started by the OLT of PON: the information insert end of PON inserts the measure packet and sends it to the information obtain end, the information obtain end gets the measure packet, OLT of PON can get the PON performance parameter according to the information of the measure packet, so that the purpose of measuring network performance parameter on line in PON is realized. A system for measuring PON performance parameter on line and OLT and ONU are disclosed. The method, system and device of measuring on line provided in the invention not only provide the foundation for optimizing the network, expending the capacity or quality evaluating, but also reduces the measure cost since it is not necessary to use the special measure line and device.

Description

Method, system and device for measuring performance parameters of passive optical network online

Technical field

The present invention relates to the field of passive optical network communications, and more particularly to a method, system and apparatus for measuring passive optical network performance parameters online. Background of the invention

Passive Optical Network (PON) technology is a point-to-multipoint optical access technology. This approach allows multiple users to share a relatively expensive fiber link from the exchange to the customer premises, thus greatly reducing Fiber To The Building (FTTB) and Fiber To The Home (Fiber To The Home, The cost of using FTTH).

The PON is usually an optical line terminal (OLT) on the network side of the central office (CO) and a plurality of optical network units (ONU λ, OLT) located at the user side of the customer premises. The connection to each ONU is realized by an optical distribution network (ODN) composed of an optical fiber, a passive optical splitter or a coupler. FIG. 1 is a schematic diagram of a typical manner of a PON networking in the prior art. The OLT 110 interacts with the aggregation layer network and connects to the ONUs such as the ONU 130 through the ODN 120. The ONU 130 can be connected to the Customer Premises Network (CPN), which is not shown.

Due to its high bandwidth, PON can support voice, data and video applications. In a multi-service operating environment, operators have put forward higher requirements for business management and testing. The Common Technical Special (CTS) issued by the Full Service Access Networks (FSAN) clearly states that the performance of the user service flow, such as the transmission delay, should be measured in real time on the OLT device. (Delay), transmission delay jitter (Jitter), packet loss rate (FLR), etc. Wherein, the transmission delay is from the time the message is sent to The required delay time; the transmission delay jitter includes the average transmission delay, the maximum transmission delay and the minimum transmission delay; the packet loss ratio is the ratio of the number of packets received to the number of packets sent.

In a PON system, the OLT and the ONU must be synchronized, and the system either keeps the time references of the two consistent, or makes the time reference between the two differences by a certain difference Δ T . Then ΡΟΝ transmission delay Delay can be expressed as: Dday=T (arrival) - T (send) + Δ Τ, where Δ T is 0 if the time base of the OLT and ONU remains the same.

For the measurement of PON performance parameters such as transmission delay, transmission delay jitter, and packet loss rate, in the prior art, conventional measurement instruments and methods can be used, but special measurement lines and measuring instruments are required.

2 is a schematic diagram of a measurement method of a PON performance parameter in the prior art. As shown in Figure 2, when measuring PON performance parameters, it is necessary to use special measuring instruments such as Smartbits from Spirent, and special measurement lines are required. As shown in FIG. 2, the dedicated measurement line includes a network side OLT, an ODN, and a user side ONU, and the measurement special instrument also needs to be respectively connected to the OLT and the ONU to measure the network side and the user side. In this way, when performing the above PON performance parameter measurement, the PON interface of the network side OLT and the PON interface of the user side ONU and the user network interface (leak) interface are occupied, and the ONU is connected to the customer premises network through the UNI interface, and thus The measurement needs to stop the user's business, and online measurement cannot be achieved.

In the prior art, when a dedicated measurement line and an instrument are used to measure PON performance parameters, it is necessary to occupy a network port, such as a PON interface and a user network interface (UNI) interface, so that user service needs to be stopped during measurement, which is costly to implement. . It can be seen that the prior art cannot meet the requirements of measuring PON performance parameters online and in real time. Summary of the invention

In view of this, an embodiment of the present invention provides a method for measuring a PON performance parameter online. Online real-time measurement of PON performance parameters can be achieved.

The embodiment of the invention further provides a passive optical network system, and the OLT and the ONU in the system, which can realize real-time measurement of PON performance parameters.

The technical solutions of the embodiments of the present invention are specifically as follows:

A method for online measurement of a PON performance parameter of a passive optical network includes the following steps: The optical line terminal OLT sends an instruction to open the measurement process to the ONU of the optical network unit; the information insertion end inserts the measurement message according to the parameter to be measured and sends the information to the information The acquiring end acquires the inserted measurement message by the information acquiring end;

The optical line terminal OLT obtains the measured value of the PON parameter according to the information of the measurement message.

Passive optical network PON system, including optical line terminal OLT and optical network unit

ONU,

The OLT is configured to send, to the ONU, an instruction to start the measurement process; the information insertion terminal inserts the measurement message according to the parameter to be measured, and then sends the measurement message to the ONU; and the information acquisition end acquires the measurement message inserted by the ONU. ; also used to obtain the PON parameter measurement value according to the information of the measurement message;

The ONU, as the information insertion end, inserts the measurement message according to the parameter to be measured and sends the measurement message to the OLT; and the information acquisition end acquires the measurement message inserted by the OLT.

An optical line terminal OLT includes a start unit, a measurement message unit, a PON parameter acquisition unit, and an interface unit;

The initiating unit is configured to send, by using the interface unit, an instruction to start a measurement process to an optical network unit;

The measurement message unit, when the OLT is used as an information insertion end, is configured to insert a measurement message according to a parameter to be measured, and send the inserted measurement message and the information of the received measurement message through the interface unit; When the OLT is used as the information acquiring end, the OLT is configured to receive the measurement packet by using the interface unit, and obtain the information of the measurement packet; Sending to the PON parameter acquisition unit;

The PON parameter obtaining unit is configured to obtain a PON parameter measurement value according to the information of the measurement message received from the measurement message unit.

An optical network unit ONU includes a measurement message unit and an interface unit,

The measurement message unit, when the ONU is used as the information insertion end, is configured to insert a measurement message according to the parameter to be measured, and send the inserted measurement message through the interface unit; when the ONU is used as the information acquisition end And receiving, by the interface unit, a measurement message, and acquiring information of the measurement message, and sending the information through the interface unit.

The method for measuring PON performance parameters provided by the embodiment of the present invention controls, and initiates, the process of measuring PON performance parameters online by the OLT: the information insertion end inserts the measurement message and sends it to the information acquisition end of the PON, and the information is obtained by the information insertion end. The acquiring end obtains the measurement packet, and the OLT of the PON can obtain the PON performance parameter according to the information of the measurement packet, thereby realizing the purpose of measuring the network performance parameter in real time in the PON.

The information insertion end and the information acquisition end may respectively be an OLT or an ONU of the PON, and the PON performance parameters include a transmission delay, a transmission delay jitter, and a packet loss rate. The online measurement method provided in accordance with the present invention not only provides a basis for further network optimization, capacity expansion or quality evaluation, but also reduces measurement costs by eliminating the need for dedicated measurement lines and equipment. BRIEF DESCRIPTION OF THE DRAWINGS

1 is a schematic diagram of a typical manner of a P0N networking in the prior art;

2 is a schematic diagram of a P0N performance parameter measurement method in the prior art;

3 is a general flow chart of a method for measuring P0N performance parameters on-line according to an embodiment of the present invention;

FIG. 4 is a schematic diagram of an overall system structure for measuring P0N performance parameters on-line according to an embodiment of the present invention; FIG. 5 is a schematic diagram of a P0N system according to an embodiment of the present invention; FIG.

6 is a schematic structural diagram of a measurement message according to an embodiment of the present invention;

7 is a schematic flowchart of a method for measuring a P0N uplink transmission delay jitter value according to a method provided in an embodiment of the present invention;

FIG. 8 is a schematic flowchart of an embodiment of measuring a P0N downlink packet loss rate according to a method provided by an embodiment of the present invention. Mode for carrying out the invention

An embodiment of the present invention provides a method for measuring a P0N performance parameter on-line, and the process of measuring the P0N performance parameter by the 0LT of the P0N is initiated and the measurement insertion message is inserted into the information acquisition end and sent to the information acquisition end, and the information is obtained by the information. The terminal obtains the measurement message, and the 0LT of the P0N can obtain the P0N performance parameter according to the information of the measurement message, and can realize the purpose of measuring the network performance parameter in real time online in the P0N.

In order to make the objects, technical solutions and advantages of the embodiments of the present invention more clear, the embodiments of the present invention are further described in detail below.

FIG. 3 is a schematic flowchart of a method for measuring P0N performance parameters on-line according to an embodiment of the present invention. As shown in Figure 3, the method includes:

Step 301: The OLT sends an instruction to the ONU to start the measurement process.

Step 302: The information insertion end inserts the measurement message according to the parameter to be measured, and then sends the measurement message to the information acquiring end, and the information acquiring end acquires the inserted measurement message.

In this step, according to different measurement parameters, the network element corresponding to the information insertion end and the information acquisition end is also different. When the downlink parameter is measured, the information insertion end is the OLT, and the information acquisition end is the ONU. When the uplink parameter is measured, the information insertion end is the ONU, and the information acquisition end is the OLT.

Step 303: The 0LT obtains the P0N parameter measurement value according to the measurement message information.

FIG. 4 is a schematic diagram of an overall system structure for measuring P0N performance parameters on-line according to an embodiment of the present invention; Figure. As shown in Figure 4, the system includes an OLT and a zero volume. The 0LT includes a start unit, a measurement message unit, a P0N parameter acquisition unit, and an interface unit; and the volume includes a measurement message unit and an interface unit. The system consisting of 0LT, 0NU shown in FIG. 4 can be used to implement the method flow shown in FIG.

In the system, the start unit of the 0LT is configured to send an instruction to open the measurement flow through the interface unit, where the instruction includes measurement indication parameter information. The measurement message unit is configured to insert a measurement message according to the parameter to be measured when the 0LT is used as the information insertion end, and send the inserted measurement message and the received measurement message information through the interface unit; when the 0LT is used as the information acquisition end, The method is configured to receive the measurement message by using the interface unit, and generate the measurement message information; and send the measurement message information to the P0N parameter acquisition unit. The P0N parameter obtaining unit is configured to obtain a P0N parameter measurement value according to the measurement message information received from the measurement message unit.

0NU measurement>3⁄4 text unit, when 0 is used as the information insertion end, it is used to insert the measurement message according to the parameter to be measured, and send the inserted measurement message through the interface unit of 0NU; when 0NU is used as the information acquisition end , is used to receive measurement packets through the interface unit of the ONU, and generate measurement message information, which is sent out through the interface unit of the ONU.

The foregoing is a general overview of the on-line measurement P0N performance parameters provided by the embodiments of the present invention:

FIG. 5 is a schematic structural diagram of a P0N system according to an embodiment of the present invention. As shown in FIG. 5, the OLT 510 exchanges information with the aggregation layer network through the switch module, and connects to the zero volume 530 through the 0DN 520. Compared with the schematic diagram of the typical mode of the P0N networking in the prior art as shown in FIG. 1, in this embodiment, the media access controller (MAC) 512 is used on the POT side OLT 510, and the P0N interface 511 and the 0DN are used. 520 is connected; MAC 532 is used at the user side 0 530 end, and is connected to the 0DN 520 through the P0N interface 531, and the MAC 332 is also connected to the UNI interface 533. The MAC is a protocol processing module in the P0N system, and in this embodiment, the MAC 512 is utilized. The activation unit, the measurement message unit and the measurement P0N parameter acquisition unit of the OLT shown in FIG. 4 are implemented, and the measurement unit of the zero volume shown in FIG. 4 is implemented by using the MAC 532. The interface unit of the 0LT shown in FIG. 4 is implemented by the P0N interface 531 of the 0LT 510 end, and the interface unit of the 0NU shown in FIG. 4 is implemented by using the P0N interface 531 and the UNI interface 533 of the 520 terminal. As shown in Figure 5:

When the P0N uplink performance parameter needs to be measured, the measurement packet is inserted into the UNI interface 533 or the P0N interface 531 of the user side 0 and sent to the network side. The MAC 512 of the network side 0LT obtains the measurement packet, and according to the measurement report, The information of the text gives the P0N uplink performance parameters.

When the P0N downlink performance parameter needs to be measured, the measurement packet is inserted into the P0N interface 511 of the network side and sent to the user side. The MAC 532 of the user side 0 obtains the measurement packet, and according to the information of the measurement packet, P0N downlink performance parameters.

In the embodiment of the present invention, the measurement message adopts the same message structure as the ordinary user message. In this way, in the online measurement process of the entire P0N performance parameter, the processing and transmission process of the measurement message is consistent with the processing and transmission process for the ordinary user message, which is equivalent to an ordinary user service flow, and therefore, according to The measurement value of the P0N performance parameter obtained by the measurement message can be regarded as the P0N performance parameter value for processing the user message.

The message structure of the measurement message is the same as the user message, and the feature identification information is included, and the information is pre-agreed by the information insertion end and the information acquisition end. In this way, after the measurement message including the feature identification information is inserted from the information insertion end and sent to the information acquisition end, the MAC of the information acquisition end can identify and acquire the measurement information according to the feature identification information. The feature identification information includes: Ethernet virtual local area network (VLAN) frame header feature information, Ethernet 802. lp priority frame header feature information, or GP0N encapsulation method (GEM) frame header feature information.

FIG. 6 is a schematic structural diagram of a measurement message in an embodiment of a method according to an embodiment of the present invention. In this embodiment, P0N is GP0N, so there is a GEM layer header area in the message structure. The PON parameter that needs to be measured online is the PON transmission delay value, so it is necessary to insert the transmission time information when the measurement is inserted in the measurement.

As shown in FIG. 6, if the feature information is Ethernet frame header feature information, such as Ethernet VLAN frame header feature information or Ethernet 802. lp priority frame header feature information, the Ethernet frame header feature information may be Set in the MAC layer protocol header area of the measurement message, such as the destination MAC address (DMAC) area, the Ethernet upper layer protocol type (Type) area, or the payload area. Since the present embodiment is for the case of GP0N, there is a GEM layer header area, so the feature information may also be GEM header feature information, which is set in the GEM layer header area.

As shown in FIG. 6, in the embodiment, when measuring the P0N transmission delay value, the transmission time information when the measurement message is inserted needs to be inserted in the measurement message, and the time information is set in the measurement message payload. In the area, the information insertion end does not affect the information insertion end to send the measurement message to the information acquisition end according to the processing flow of the ordinary user message, and the information acquisition end does not affect the information acquisition end to identify and acquire the measurement message. After the information acquisition end obtains the measurement message, it can obtain related information.

According to the online measurement method of the P0N performance parameter provided by the embodiment of the present invention, the measurement process is initiated by the 0LT and the P0N performance parameter measurement value is obtained according to the obtained information. When the 0LT initiates the measurement process, an instruction to open the measurement process is sent to the information insertion end. In the GP0N system, the instruction adopts the zero volume management control interface (0MCI) protocol, and in the EP0N system, the instruction uses the operation and maintenance management ( 0AM) Agreement.

The instruction for starting the measurement process may include measurement indication parameter information, such as the number of measurement message acquisition thresholds, the measurement message acquisition time interval threshold value, the number of measurement message transmissions, and the measurement message transmission rate. .

When the P0N performance parameter needs to be measured by inserting and acquiring multiple measurement packets, the number of measurement packets to be obtained may be set in the instruction for starting the measurement process. In this way, after the information acquisition end completes the step of acquiring the measurement message and counts the number of acquired measurements, If the number of the measurement packets is smaller than the number of the measurement packets, the obtained information is insufficient to obtain the P0N performance parameters. Therefore, the measurement process is restarted or the measurement process is ended.

When it is necessary to measure the P0N performance parameter by inserting and acquiring multiple measurement messages, the measurement message acquisition time interval gate P艮 value may be set in the above instruction for starting the measurement process. In this way, after the information acquisition end completes the step of acquiring a measurement message, the waiting time exceeds the measurement message acquisition time interval threshold, and the next measurement message is not obtained, and the network quality may be considered to be bad or the network may be considered. Interrupt, therefore, restart the measurement process or end the measurement process.

When it is necessary to measure the P0N performance parameter by inserting and acquiring multiple measurement messages, the number of measurement message transmissions can be set in the above instruction for starting the measurement process. In this way, the information insertion end inserts and transmits the measurement message according to the number of the measurement message transmission. When the number of the measurement measurement messages reaches the number of the measurement message transmission, the information insertion end stops acquiring the measurement message. A message for completing the insertion of the measurement message is sent to the 0LT, and then the acquired information is supplied to the 0LT to obtain the P0N performance parameter measurement value.

When it is necessary to measure the P0N performance parameter by inserting and acquiring multiple measurement messages, the measurement message transmission rate can be set in the above instruction for starting the measurement process. In this way, the information insertion end inserts and sends the measurement message according to the measurement message sending rate, and the information insertion end stops acquiring the measurement message until the information insertion end receives the instruction to stop acquiring the measurement message sent by the 0LT. The acquired information is provided to the 0LT to derive the P0N performance parameter measurement.

The method for measuring the P0N performance parameter on-line by the embodiment of the present invention controls the process of measuring the P0N performance parameter by the network side OLT of the P0N: the information insertion end inserts the measurement message and sends it to the information acquisition end, The information acquisition end obtains the measurement message, and the 0LT of the P0N can obtain the P0N performance parameter according to the information of the measurement message.

The information insertion end and the information acquisition end may respectively be 0LT or 0 volumes of P0N. If the P0N uplink parameter needs to be measured, 0NU is the information insertion end, and 0LT is the information acquisition. The OLT obtains the P0N uplink parameter according to the obtained measurement message information; if the P0N downlink parameter needs to be measured, the 0LT is the information insertion end, 0NU is the information acquisition end, and the measurement report will be obtained after the measurement is stopped. The text information is sent to the OLT, and the 0LT obtains the P0N downlink parameter according to the obtained measurement message information. The following is a description of the specific embodiment flow.

FIG. 7 is a schematic flowchart of an embodiment of measuring a PON uplink transmission delay jitter value according to a method provided by an embodiment of the present invention. In this embodiment, the network side OLT initiates the measurement process, and the user-side ONU inserts the measurement message and sends the measurement message to the network side after receiving the instruction to start the measurement process; the network side OLT acquires the measurement message, and records the measurement message. The arrival time of the ONU; the ONU inserts the measurement message multiple times, and the OLT obtains the measurement message multiple times and counts the number of the obtained measurement packets; the OLT obtains the time information of the plurality of measurement messages and the corresponding arrival time information. A plurality of PON uplink transmission delay values are obtained, and according to the obtained number of measurement packets, the PON uplink transmission delay jitter value is further obtained. Specific steps are as follows:

Step 701: The 0LT of the P0N initiates a measurement process, and sends an instruction to start the process of measuring the uplink transmission delay jitter value to the zero volume, where the instruction includes information of the measurement indication parameter, where the measurement indication parameter includes the number of measurement message transmissions and the measurement. The number of packets obtained is the threshold.

Step 702: After receiving the instruction in step 701, the 0NU inserts a measurement message in the uplink direction of the UNI interface or the P0N interface, where the measurement message includes the transmission time information when the measurement message is inserted.

Step 703, the 0NU sends the measurement file inserted in step 702 to the 0LT.

Step 704, 0 records the number of measurements that have been inserted.

Step 705, 0NU detects that if the number of inserted measurement messages is equal to the number of measurement messages sent in step 701, step 706 is performed; otherwise, step 702 is returned, that is, the insertion continues. A measurement ^艮文.

Step 706: The 0NU stops inserting the measurement message, and sends a message to the 0LT to complete the insertion of the measurement message. Step 707: The OLT acquires the measurement text in step 702 through the MAC, obtains the transmission time information therein, and records the arrival time of the measurement text.

Step 708, 0LT counts the number of measurement packets that have been acquired.

Step 709, 0LT detects whether the message of completing the insertion measurement message sent by the ONU as described in step 706 is received. If the message is received, step 710 is performed; otherwise, the process returns to step 707, and continues to wait for the next measurement. Message.

Step 710, 0LT stops acquiring the measurement message.

Step 711: If the number of measurement packets that are obtained in step 708 is not less than the threshold value of the measurement packet set in step 701, step 712 is performed; otherwise, step 701 is returned. That is, restart the measurement process or end the measurement process.

Steps 712, 0LT obtain a plurality of P0N uplink transmission delay values according to the transmission time information of the plurality of measurement messages obtained in step 707 and their corresponding arrival time information, and according to the measurement report obtained in step 708. The number of texts further yields the P0N uplink transmission delay jitter value.

In the embodiment shown in FIG. 7, in the instruction in step 710, the measurement message acquisition threshold value is set as the measurement indication parameter. If the number of measurement packets that have been acquired by the OLT is less than the threshold value of the set measurement packet, the information obtained is insufficient to obtain the P0N performance parameter, that is, the P0N transmission delay jitter value. Thus, step 710 can be returned to restart the measurement process or end the measurement process.

In the embodiment shown in FIG. 7, the measurement message acquisition time interval threshold value may be further set in the instruction in step 710 as a measurement indication parameter. If, after the 0LT obtains a measurement packet in step 750, the time when the next measurement packet arrives is greater than the threshold value of the set measurement packet, and the next measurement packet is not obtained, The network quality is poor or the network is down. Therefore, return to step 710 to restart the measurement process or end the measurement process. In the embodiment of measuring the PON uplink parameter shown in FIG. 7, the insertion or acquisition of the measurement message is started or stopped, and is controlled by the instruction of the process of opening the measurement uplink parameter sent to the zero volume in step 701, where the instruction is The number of measurement message transmissions is set as the measurement indication parameter. After each time the 0NU inserts and sends the measurement message, the number of inserted measurement messages is counted in step 704, and compared with the number of the set measurement messages sent in step 705, if the inserted measurement is performed. If the number of packets has reached the set number of measurement packets sent, the measurement message is stopped and notified to 0LT. In step 707, 0LT waits for the arrival of the measurement message, and obtains the measurement message when it arrives, and In step 708, the number of acquired measurement messages is counted. When the 0LT receives the message of completing the insertion measurement message sent by the ONU in step 709, the process stops waiting for and acquiring the measurement message.

In this embodiment, the insertion and measurement flow of the measurement message is controlled only by setting the number of measurement message transmissions. Further, the insertion of the measurement data may also be a timing insertion, so that the measurement message transmission rate can be further set in the instruction to turn on the measurement flow, thereby inserting the measurement text at a constant speed.

In the embodiment shown in FIG. 7, the insertion and acquisition of the measurement message are controlled to be turned on or off by setting the number of measurement message transmissions in the instruction to turn on the measurement flow in step 701. For the measurement of the P0N uplink parameter, the control packet transmission rate can also be set by setting the measurement packet transmission rate in the instruction of the measurement flow: 0 volume inserts and sends the measurement message according to the measurement message transmission rate timing, instead of Step 704 is performed, that is, the number of the inserted measurement packets is counted; when the measurement message needs to be stopped, the instruction to stop the measurement is sent from 0LT to the 0NU, then the zero volume stops inserting the measurement message, and the 0LT stops acquiring the measurement message. Then, the 0LT obtains the P0N uplink transmission delay jitter value according to the obtained measurement message information.

In the embodiment shown in FIG. 7, in the step 707, after the 0LT acquires the first measurement message, according to the recorded arrival time information and the transmission time information in the measurement message, the first information is obtained. P0N uplink transmission delay value. Therefore, if you need to measure on P0N For the row transmission delay value, the number of the measurement message transmissions may be set to 1 in step 701. In the embodiment shown in FIG. 7, the P0N uplink transmission delay value can be obtained in step 712, and according to this, the P0N uplink round-trip transmission delay value can be further obtained.

If the parameter to be measured is the packet loss rate, the packet loss rate can be obtained by counting the number of packets sent and the number of packets received. Therefore, when the measurement packet is inserted, the transmission time information does not need to be included. It is also not necessary to record the arrival time information when obtaining measurement messages.

As described above, the online measurement method of the P0N uplink parameter provided by the present invention is described by way of example, and the online measurement of the P0N downlink parameter can also be implemented by a similar method.

FIG. 8 is a schematic flowchart of an embodiment of measuring a PON downlink packet loss rate according to a method provided by an embodiment of the present invention. In this embodiment, the network side OLT initiates the measurement process; the network side OLT inserts the measurement message and sends the measurement message to the user side, and the user side ONU obtains the measurement message; the OLT inserts the measurement message multiple times, and the ONU acquires the measurement report multiple times. The OLT collects the number of measurement packets that have been obtained. After the OLT completes the insertion measurement, it notifies the ONU. After receiving the notification, the ONU sends the obtained measurement packet number information to the OLT. The OLT calculates the acquired measurement according to the OLT. The number of packets and the number of measured packets sent are obtained, and the packet loss rate of the PON is obtained. The specific steps are as follows: Step 801: The OLT of the PON initiates a measurement process, and sends an instruction to the ONU to start the process of measuring the downlink packet loss rate, where the command includes the information of the measurement indication parameter, where the measurement indication parameter includes the number of measurement packets sent and The number of measurement packets is obtained.

Step 802, 0LT inserts the measurement text in the downlink direction of the P0N interface.

Step 803, 0LT sends the measurement file inserted in step 802 to 0NU.

Step 804, 0LT counts the number of measurement messages that have been inserted.

Step 805, 0LT detects that if the number of inserted measurement messages is equal to the number of measurement messages sent in step 801, step 806 is performed; otherwise, step 802 is returned, that is, the insertion continues. A measurement ^艮文.

Step 806, 0LT stops inserting the measurement message, and sends the completed insertion measurement report to the 0 volume. Message of the text.

Step 807, 0NU obtains the measurement according to the method described in step 802 by the MAC,

Step 808, 0NU counts the number of measurement packets that have been acquired.

Step 809, the 0NU detects whether the message of completing the insertion measurement message sent by the OLT according to step 806 is received. If the message is received, step 810 is performed; otherwise, the process returns to step 807, and continues to wait for the next measurement. Message.

Step 810: The 0NU stops acquiring the measurement message and sends the acquired measurement message number information to the 0LT.

Step 811, 0LT detects that if the number of measurement packets that have been acquired in step 810 is not less than the number of measurement packets obtained in step 801, step 812 is performed; otherwise, step 801 is returned. That is, restart the measurement process or end the measurement process.

Steps 812, 0LT obtain the P0N downlink packet loss rate according to the number of measurement packets that have been acquired in step 810 and the number of measurement packets sent in step 801.

In this embodiment, since only the number of packets to be measured and the number of packets to be obtained are measured, the required packet loss rate can be obtained. Therefore, when the measurement packet is inserted, the transmission time information is not included, and the measurement is acquired. It is also not necessary to record the arrival time information.

In the embodiment of measuring the P0N downlink parameter shown in FIG. 8, the threshold value of the measurement packet is set in the instruction in step 801, as a measurement indication parameter, and the function is as shown in FIG. The role in the embodiment of the P0N uplink parameter is the same. The instruction in step 801 sets the threshold value of the number of measurement packets to be obtained. If the number of measurement packets acquired by the 0LT detection in step 811 is smaller than the threshold value of the set measurement packets, The information obtained is insufficient to obtain the P0N performance parameter, that is, the P0N packet loss rate. Therefore, the process may be returned to step 801 to restart the measurement process or end the measurement process.

In the embodiment of measuring the P0N downlink parameter shown in FIG. 8, the measurement message acquisition time interval threshold value may be further set in the instruction in step 801 as a measurement indication parameter, The effect is the same as in the embodiment of measuring the PON uplink parameters as shown in FIG. If the time after the 0LT acquires a measurement message in step 807, the time when the next measurement message arrives is greater than the threshold value of the set measurement message, and the next measurement message is not obtained, The network quality is poor or the network is interrupted. Therefore, you can return to step 801 to restart the measurement process or end the measurement process.

In the embodiment of measuring the P0N downlink parameter shown in FIG. 8, the insertion or acquisition of the measurement message is started or stopped, and is controlled by the instruction of the ON measurement downlink parameter flow sent to the ONU in step 801, in the instruction. The number of measurement message transmissions is set as the measurement indication parameter. Its effect is the same as that in the embodiment of measuring the P0N uplink parameter as shown in FIG. Similarly, the insertion of the measurement message can also be a timing insertion, so that the measurement message transmission rate can be further set in the instruction to start the measurement process, so that the measurement message can be inserted at a constant speed.

Similar to the case in the embodiment of measuring the P0N uplink parameter as shown in FIG. 7, for the measurement of the P0N downlink parameter, the control message transmission rate can also be set by setting the measurement message transmission rate in the instruction of the open measurement flow: 0LT The measurement message is periodically inserted and sent according to the measurement message transmission rate, without performing step 804, that is, counting the number of inserted measurement messages; when it is necessary to stop inserting the measurement message, the measurement is sent from 0LT to 0NU. The instruction of the 0LT stops inserting the measurement message, the zero volume stops acquiring the measurement message and sends the obtained measurement message number information to the 0LT, and then the 0LT obtains the P0N downlink packet loss according to the obtained measurement message information. rate.

The method for measuring the P0N performance parameter on-line by the present invention controls the process of measuring the P0N performance parameter by the 0LT of the P0N: the information insertion end inserts the measurement message and sends it to the information acquisition end, which is obtained by the information acquisition end. The measurement message, the 0LT of the P0N can obtain the P0N performance parameter according to the information of the measurement message, thereby realizing the purpose of measuring the network performance parameter in real time online in the P0N.

The information insertion end and the information acquisition end may respectively be 0LT or ONU of P0N, and the P0N Performance parameters include transmission delay, transmission delay jitter, and packet loss rate. The online measurement method provided by the present invention not only provides a basis for further network optimization, capacity expansion or quality evaluation, but also reduces the measurement cost by eliminating the need to use dedicated measurement lines and equipment.

In summary, the above description is only the preferred embodiment of the present invention and is not intended to limit the scope of the present invention.

Claims

Claim

A method for measuring a PON performance parameter of a passive optical network, comprising:

The optical line terminal OLT sends an instruction to open the measurement process to the ONU of the optical network unit; the information insertion end inserts the measurement message according to the parameter to be measured, and then sends the measurement message to the information acquisition end, where the information acquisition end acquires the inserted measurement message;

2. The method of claim 1 wherein: inserting a measurement comprising transmitting time information;

After the information acquiring end acquires the measurement message, the arrival time of the measurement message is recorded;

The OLT obtains a PON transmission delay value according to the transmission time information in the measurement message and the arrival time information of the measurement message.

3. The method of claim 1 wherein:

Inserting a plurality of measurement messages, each of the measurement messages includes transmission time information; the information acquisition end acquires the plurality of measurement messages, and records arrival time information of each measurement message;

The OLT obtains a transmission delay value of the measurement packet according to the sending time information and the arrival time information of each measurement packet, and the number of the measured measurement packets and the measurement packet according to the obtained measurement packet The transmission delay value determines the transmission delay jitter value.

4. The method of claim 1 wherein:

Inserting a measurement message according to the number of pre-specified measurement packets sent;

After the information acquisition end obtains the inserted measurement message, the number of the obtained measurement packets is counted;

Sending, by the OLT, the number of measurement packets that have been acquired, and the measurement packet Send a number and get the packet loss rate.

5. The method according to claim 1, wherein the indication parameter information is further included in the instruction to open the measurement flow.

The method according to claim 5, wherein the measurement indication parameter is a number of measurement messages sent;

The information insertion end counts the number of inserted measurement messages. If the number of inserted measurement messages is equal to the number of measurement packets sent, the measurement message is stopped, and the insertion measurement is sent to the information acquisition end. The message of the message; after receiving the message, the information acquiring end stops acquiring the measurement message.

The method according to claim 5, wherein: the measurement indication parameter is a measurement message transmission rate;

Inserting a measurement message according to the measurement message transmission rate.

The method according to claim 5, wherein: the measurement indication parameter is a threshold value of the measurement text;

The information acquisition end counts the number of the measured measurement messages, and if the number of the acquired measurement packets is smaller than the number of the measurement packets, the process returns to execute the sending start measurement process instruction. The operation or the end.

The method according to claim 1, wherein: the information insertion end is an ONU, and the information acquisition end is an OLT; and the PON parameter is a PON uplink parameter.

The method of claim 1, wherein: the information insertion end is an OLT, and the information acquisition end is an ONU; and the PON parameter is a PON downlink parameter.

11. The method of claim 1, wherein: the measurement message includes feature identification information.

The method according to claim 11, wherein: the PON is a G-bit passive optical network GPON, and the feature identification information is set at a layer of a GPON encapsulation method. GEM frame header feature information of the area.

The method according to claim 11, wherein: the feature identification information is Ethernet VLAN local area VLAN header feature information or Ethernet 802.1p priority frame header feature information.

14. The method according to claim 13, wherein: the feature identification information is set in a destination MAC address DMAC region, an Ethernet upper layer protocol type Type region, or a payload in a MAC layer protocol header region in the measurement text. region.

15. A passive optical network PON system comprising an optical line terminal OLT and an optical network unit ONU, wherein

An optical line terminal OLT, characterized in that the OLT comprises an activation unit, a measurement message unit, a PON parameter acquisition unit and an interface unit;

The measurement message unit, when the OLT is used as an information insertion end, is configured to insert a measurement message according to a parameter to be measured, and send the inserted measurement message and the information of the received measurement message through the interface unit; When the OLT is used as the information acquiring end, the OLT is configured to receive the measurement message through the interface unit, and obtain the information of the measurement message; and further, send the information of the measurement message to the PON parameter obtaining unit;

The PON parameter obtaining unit is configured to perform, according to the measurement received from the measurement message unit The information of the packet is obtained, and the measured value of the PON parameter is obtained.

An optical network unit ONU, characterized in that the ONU comprises a measurement message unit and an interface unit,