WO2012167577A1

WO2012167577A1 - Method and system for discovering optical network unit

Info

Publication number: WO2012167577A1
Application number: PCT/CN2011/083116
Authority: WO
Inventors: 杨晶越
Original assignee: 华为技术有限公司
Priority date: 2011-11-29
Filing date: 2011-11-29
Publication date: 2012-12-13
Also published as: CN102511133B; CN102511133A

Abstract

A method for discovering an optical network unit, including: an optical line terminal broadcasts a gate frame to an optical network unit, and if an uplink response from the optical network unit is received outside the registration windowed time, then it is decided that there is a newly-added optical network unit; the optical line terminal adjusts the number of halt frames and broadcasts a halt frame to the optical network unit according to the adjusted number of halt frames; and the optical line terminal sends a request to the optical network unit so as to acquire the serial number and ranging information about the newly-added optical network unit. Accordingly, further provided are a device for discovering an optical network unit and a passive optical network system. The present invention can automatically discover a newly-added optical network unit outside the configuration range of the passive optical network and acquire the serial number and ranging information about the newly-added optical network unit. In addition, further provided is a technical solution for adjusting the configuration range of a passive optical network so that the optical line terminal can register the whole or part of the discovered newly-added optical networks on line.

Description

Method and system for discovering optical network unit

Technical field

The present invention relates to the field of communications technologies, and in particular, to a method and system for discovering an optical network unit. Background technique

With the gradual acceleration of the informationization process, the Internet as an important means of information dissemination has become the main platform for people to obtain information and exchange information. With the development of "voice, data and video" three-in-one Internet services, users' requirements for network transmission distance, transmission reliability, bandwidth, etc. are gradually improving. Optical access network technology is stable in performance and low in cost. The advantages of easy installation and easy maintenance have become the most potential network application technology.

Fiber to The Building (FTTB) in optical access network technology utilizes digital broadband technology, the optical fiber directly into the community, and then through the twisted pair (super five twisted pair or four pairs of unshielded twisted pair) ) to individual users. With the continuous popularization and extension of the FTTB network, the distance between the Optical Network Unit (ONU) and the Optical Line Terminal (OLT) is getting farther and farther. For each optical line terminal, the configuration range is different. For a gigabit passive optical network system, the default configuration range of the optical line terminal is 0Km ~ 20Km, the maximum configuration range is 60Km, and the optical line terminal is The distance between the nearest optical network unit and the optical network unit farthest from the optical line terminal cannot exceed 20 Km. The optical line terminal can register all the optical network units added in the configuration range, but if it exceeds the configuration range of the optical line terminal, the newly discovered optical network unit cannot be found automatically. The optical network unit cannot be properly connected to the network, which increases the restriction on the use of the user, and also limits the actual capacity of the optical network unit, which brings great inconvenience to the operator's later development and maintenance.

Summary of the invention

Embodiments of the present invention provide a method and system for discovering an optical network unit, which are used to discover a new optical network unit outside the configuration range of the passive optical network.

In order to solve the above technical problem, the technical solution adopted by the embodiment of the present invention is:

A method of discovering an optical network unit, comprising:

The optical line terminal broadcasts the gate frame to the optical network unit; if the uplink response of the optical network unit is received outside the registered window opening time, it is determined that there is a new optical network unit;

The optical line terminal adjusts the number of frames of the halt frame, and adjusts the number of frames of the adjusted half frame to the optical network. The unit broadcasts a halt frame;

The optical line terminal acquires a serial number and ranging information of the newly added optical network unit.

A system for discovering an optical network unit, comprising:

a gate frame broadcast unit, configured to broadcast a gate frame to the optical network unit;

a receiving unit, configured to receive an uplink response of the optical network unit, and if the uplink response is received outside the registered windowing time, determining that a new optical network unit exists;

a halt frame adjustment unit, configured to calculate, when the receiving unit determines that a new optical network unit exists, calculate a frame number of a halt frame sent by the optical line terminal to the optical network unit;

a halt frame sending unit, configured to broadcast a halt frame to the optical network unit according to the frame number of the adjusted halt frame calculated by the halt frame adjusting unit;

The obtaining unit is configured to obtain a serial number and ranging information of the newly added optical network unit.

In the embodiment of the present invention, the method and system for discovering the optical network unit can automatically discover the newly added optical network unit outside the scope of the configuration of the passive optical network, and obtain the serial number and ranging information of the newly added optical network unit. In addition, after obtaining the sequence number and the ranging information of the newly added optical network unit, the embodiment of the present invention further provides a technical solution for adjusting the configuration range of the passive optical network, so that the optical line terminal can find all or part of the discovery. Add an optical network for discovery and online registration.

DRAWINGS

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the description of the prior art will be briefly described below. Obviously, the drawings in the following description are only It is a certain embodiment of the present invention, and other drawings can be obtained from those skilled in the art without any creative work.

1 is a schematic flowchart of a method for discovering an optical network unit according to an embodiment of the present invention; FIG. 2 is a schematic diagram of a process for acquiring a serial number and ranging information of a newly added optical network unit according to an embodiment of the present invention;

3 is a schematic diagram of a configuration range of a passive optical network in an embodiment of the present invention;

4 is a schematic structural diagram of an apparatus for discovering an optical network unit according to an embodiment of the present invention; FIG. 5 is a schematic structural diagram of an acquiring unit according to an embodiment of the present invention;

FIG. 6 is a schematic structural diagram of a first implementation manner of a configuration range adjusting unit according to an embodiment of the present invention; 7 is a schematic structural diagram of a second implementation manner of a configuration range adjusting unit in an embodiment of the present invention;

FIG. 8 is a schematic structural diagram of a passive optical network system according to an embodiment of the present invention.

detailed description

The embodiments of the present invention are further described in detail below in conjunction with the drawings and embodiments.

The method and system for adding an optical network unit are found in the embodiment of the present invention. By adjusting the number of frames of the downlink frame broadcasted by the OLT to the ONU, the optical network unit newly added outside the configuration range of the passive optical network system is discovered, and the added optical light is obtained. The serial number and ranging information of the network unit.

As shown in FIG. 1 , it is a flowchart of a method for discovering a new optical network unit according to an embodiment of the present invention, which includes:

Step 101: The OLT broadcasts a gate frame to the ONU. If an uplink response of the ONU is received outside the registration window opening time, it is determined that there is a new optical network unit.

The OLT discovers the ONU in the PON system by periodically broadcasting the gate frame, and the gate frame is used by the OLT to discover the newly added ONU.

After receiving the gate message, the unregistered ONU waits for a random time (to avoid multiple ONUs communicating with the OLT at the same time) and sends an uplink response to the OLT. For an ONU within the PON system configuration range, it will send an uplink response to the OLT during the registration windowing time. However, for ONUs outside the configured range, the upstream response returned will fall on the registration window time. Therefore, if the OLT receives an uplink response outside the registered window open time, it indicates that there is a new ONU outside the default configuration range of the OLT. For the GPON system, the default configuration range of the OLT is OKn! ~ 20Km, if the new ONU is set in OKn! Outside of ~20Km, the ONU is a new ONU outside the configuration range.

In this step, in order to avoid false detection caused by external factors such as other optical path interference, the number of detections may be appropriately increased: After the OLT repeatedly broadcasts the gate frame, if the ONU is received multiple times outside the registered window opening time In response, it is determined that there is a new ONU.

Step 102: The optical line terminal adjusts the number of frames of the halt frame, and broadcasts the halt frame to the optical network unit according to the adjusted number of frames of the halt frame.

Further, since the newly added ONU is an ONU outside the default configuration range of the OLT, it needs to be adjusted. The number of frames of the half frame is sent in full, so that the OLT has enough time to receive the response returned by the new ONU.

In the embodiment of the present invention, there are various methods for calculating the number of adjusted half frame frames. For example, the number of frames of the adjusted half frame can be calculated by the following formula: D/V*2+48 μ s+2 μ s 125 s*N Where D is the maximum physical distance between the optical line termination and the optical network unit in the passive optical network;

V is the transmission speed of light in the optical fiber, and is 200000km/s;

48 μ s is the random delay time of the optical line termination;

2 μ s is the differential delay time for the optical line terminal;

125 μs is the time of a halt frame.

For example, for a GPON system, if the OLT configuration range is OKn! ~ 60Km, ie

If D=60Km, the number of adjusted halt frame frames obtained according to the above formula is 6 frames, or the maximum configuration range of the OLT is OKm~40Km, then the number of halt frame frames is adjusted to 4 frames.

Specifically, the OLT sends a halt frame to the ONUs of all the operating states (the ONUs that have completed the online registration and the newly added ONUs that have not completed the online registration) according to the frame number of the adjusted half frame, so that all the ONUs that have completed the online registration are received. After the halt frame, the uplink transmission is stopped, and a static working area is generated.

Step 103: The optical line terminal acquires a serial number and ranging information of the newly added optical network unit.

After the newly added ONUs are found outside the configuration range, if you need to obtain the serial number and ranging information of the newly added ONU, the OLT sends a request to the ONU within the time corresponding to the static working area to obtain the sequence of the newly added ONUs. Number and ranging information.

To successfully obtain the serial number and ranging information of the ONU, the OLT must complete the operation of sending the request and receiving the ONU serial number in at least the corresponding time in the static working area, so that the length of the static working area corresponds to the time that the OLT can How long is the ONU communicating outside the distance. Therefore, if you want to obtain the serial number and ranging information of the ONU outside the configuration range, you need to adjust the time corresponding to the static working area, that is, adjust the number of frames of the halt frame sent by the OLT to the ONU, and adjust the number of frames of the halt frame. It has been discussed in step 102 and will not be described here.

If the passive optical network is a Gigabit-capable PON (GPON), the sequence number and ranging information of the new ONU can be obtained according to the process shown in Figure 2:

Step 201: The OLT sends a serial number (SN) request to the ONU.

Step 202: The OLT receives the sequence number returned by the newly added ONU. Step 203: The OLT allocates an Optical Network Unit Identifier (ONUID) to each newly added ONU.

Step 204: The OLT sends a ranging request to the newly added ONU, and receives the ranging information returned by the newly added ONU, that is, the physical distance between the ONU and the OLT is newly added.

In addition, it should be noted that in order to avoid the uplink signal conflict caused by the signals transmitted by multiple ONUs at the same time reaching the OLT, after obtaining the ranging information of each newly added ONU, a specific equalization is also inserted for each ONU. The delay value is adjusted by adjusting all ONUs to the same logical distance as the OLT and then performing TDMA (Time Division Multiple Access) to resolve the above conflict.

In the embodiment of the present invention, after discovering a new ONU outside the PON system configuration range, the discovery process of the newly added ONU is automatically completed without affecting the online ONU by adjusting the number of frames of the halt frame in real time, for the operator to light It is convenient to expand and maintain the distribution network.

Further, based on the method for discovering the optical network unit shown in FIG. 1, after obtaining the serial number and ranging information of the newly added ONU, the configuration range of the PON system can be adjusted, that is, the configuration range of the OLT is adjusted, so that the OLT is Auto-discovery and further online registration can be performed on the newly added ONUs in the adjusted configuration range.

The above method of automatically discovering an optical network unit will be exemplified below with reference to FIG.

As shown in Figure 3, the OLT sets [Α,Β] as its configuration range (GPON is used as an example, Β-A 20Km). If there is a new ONU in the range of Α~Β, the OLT can automatically discover the ONU, and Register it. The OLT can meet the operations of registering ONUs of all ONUs in the configuration range A to B. At the same time, it can also record that in all current ONUs, the distance from the ONU closest to the OLT is a, and the distance from the ONU farthest from the OLT is b. If there are d, c ₂ on the left side of the A endpoint, the new ONUs on the left side of the A endpoint are automatically found in the embodiment of the present invention. The specific process is as follows:

First, the OLT broadcasts the gate frame. If the response of the ONU at d is received outside the registration window opening time, the B' OLT determines that there is a new ONU, and the ONU is outside the configuration range of the OLT.

Specifically, after the OLT broadcasts the gate frame, for the new ONU in the configuration range, the response can be returned to the OLT during the registration windowing time, and for the ONU at the d, because it is outside the configuration range of the OLT, Then the response returned by the ONU to the OLT will fall in the registration window opening time. Therefore, if the OLT receives a response from the ONU outside the registered windowing time, it is determined that there is a new ONU outside the configuration range.

Next, the OLT adjusts the number of frames of the halt frame, and broadcasts the halt frame to the ONU according to the adjusted number of frames of the halt frame, so that the registered ONU that receives the halt frame stops the uplink transmission, and generates a static working area, and the static working area is utilized by the OLT. Register the new ONU at the _Cl outside the configuration range. The method for adjusting the number of frames of the halt frame has been discussed in step 102 and will not be described again here.

Finally, the OLT obtains the serial number and ranging information of the newly added optical network unit at the _Cl . Specifically, the method includes: (1) The OLT sends a sequence number request to the OUN, where the sequence number request is a global command for all ONUs, and the newly added OUN that receives the sequence number request returns its own sequence number to the OLT, so that the OLT obtains Add the serial number of the ONU at d. (2) The OLT assigns an ONUID to each new ONU. (3) The OLT sends a ranging request to the ONUID of the newly added optical network unit at the d, and the ONU obtains the ranging information and sends it to the OLT, so that the OLT obtains the ranging information of the newly added ONU at the d.

At this point, the OLT completed the automatic discovery process of adding ONUs to d.

Further, after the OLT completes the above automatic discovery process, the configuration range of the passive optical network can be automatically adjusted, so that the OLT can perform automatic discovery and online registration of the newly added ONUs in the adjusted configuration range. The manner of adjusting the configuration range may include the following two types: The first implementation manner of adjusting the configuration range of the PON system as the embodiment of the present invention includes:

(1) In the configuration range [A, B], find a registered ONU closest to the endpoint A, and record the location of the registered ONU as the first location a, where A a<B JL a, A, and B For natural numbers.

(2) In the configuration range [A, B], find a registered ONU closest to the endpoint of B, and record the location of the registered ONU as the second location b, where a<b : B, b is a natural number.

(3) Calculate the average value of the distance between the newly added ONU and point a outside the A endpoint (ie, the left side of the original configuration range), and record it as the third position c. For example, if there are N new ONUs of _Cl , c ₂ , ..., c _N on the left side of the original configuration range, then c=[( ad ) + ( ac ₂ ) +-+ ( ac _N )] /N, Where c < A, c is a natural number.

(4) Calculate the distance between the ONU and b points added outside the B endpoint (that is, the right side of the original configuration range) The average value of the deviation is recorded as the fourth position d. For example, if dd ₂ , ..., d _{M are} found on the right side of the original configuration range, a total of M new ONUs are found, then d = [( db ) + ( d ₂ -b ) ten ... ten ( d _M -b )] / M, where d > B, d is a natural number.

(5) After determining the above four position points, adjust the configuration range by the following conditions: If Ac < Bb, that is, the distance from the A end point to the third position c is less than the distance from the B end point to the second position b, the configuration range will be The distance to the left (Ac), the adjusted configuration range is [c, B-(Ac)].

Because Ac < Bb, after the distance from the right end point B of the original configuration range [A, B] is shifted to the left (Ac), the registered ONU at the point b is always in a state of being able to communicate with the OLT; The new ONU in the (Ac) range can also be included in the communication range of the OLT, and the OLT can send a confirmation message to the newly added ONU in this part, and the ONU is added to the part to complete the registration activation.

If dB < a- A, that is, the distance from the fourth position d to the end point of B is smaller than the distance from the first position a to the end point of A, the distance of the configuration range is shifted to the right (dB), and the adjusted configuration range is [A+(dB) , d].

Since dB < aA, the distance between the left end point A of the original configuration range [A, B] is shifted to the right (dB), and the registered ONU at the point a is always in communication with the OLT; The new ONU in the range of (dB) can also be included in the communication range of the OLT, and the OLT can send a confirmation message to the ONU added to the part, and the ONU is added to the part to complete the registration activation.

In addition, when both conditions of Ac < Bb and dB < aA are satisfied, if it is not possible to confirm whether the configuration range is shifted to the left or to the right, the proximity principle (that is, the area to be adjusted closest to the original configuration range) can be adjusted according to the principle. Make the following judgments:

If ac < db, that is, the distance from the first position a to the third position c is smaller than the distance from the fourth position d to the second position b, the distance of the configuration range is shifted to the left (Ac), and the adjusted configuration range is [c, B-(Ac)].

If ac > db, that is, the distance from the first position a to the third position c is greater than the distance from the fourth position d to the second position b, the distance of the configuration range is shifted to the right (dB), and the adjusted configuration range is [A+( dB), d].

The conditions for the adjusted configuration range of the PON system need to be met: First, ensure that the registered ONU in the original configuration range [A, B] is always in a state that can communicate with the OLT; The newly added ONUs are included in the communication range of the OLT as much as possible. Therefore, this implementation adopts the method of calculating the distance average value of the newly added ONU to the specified position (the new ONU to the point on the left side of the configuration range, and the ONU to the b point on the right side of the configuration range). More new ONUs are included in the OLT communication range.

In addition, it should be noted that if the passive optical network in the embodiment of the present invention is GPON, the configuration range must also satisfy B-A 20Km. The following takes GPON as an example to illustrate the first implementation of adjusting the configuration range:

If the value of the OLT configuration range [A, B] is [20Km, 40Km], the ONU closest to the A endpoint is located at 25 11 (ie, the first location a=25Km), and the ONU closest to the endpoint B is located at 30Km. (ie, the second position b=30Km), the third position obtained on the left side of the A endpoint is calculated as c=15Km, and the fourth position obtained on the right side of the B endpoint is calculated as d=45Km. At this time, if Ac < Bb, ie (20-15) < (40-30), the distance of the OLT configuration range can be shifted to the left (Ac)=5Km, and the adjusted configuration range is [15Km, 35Km], and the OLT will Automatic discovery and online registration of ONUs in the range of 15Km to 35Km can be performed.

In the case where the newly added ONU is unevenly distributed, there may be a distance from one or some of the newly added ONUs to the specified position, thereby affecting the selection of the third position c and/or the fourth position d, so that the first There may be deviations in the configuration range of the implementation principle of the approach. To this end, the embodiment of the present invention further provides the following second implementation manner for adjusting the configuration range of the PON system, which specifically includes:

(1) In the configuration range [A, B], find a registered ONU closest to the endpoint A, and record the location of the registered ONU as the fifth location e, where A e<B JL e, A, and B For natural numbers.

(2) In the configuration range [A, B], find a registered ONU closest to the end point of B, and record the position of the registered ONU as the sixth position f, where e<f B, f is a natural number.

(3) Determine the seventh position g outside the A endpoint (ie, the left side of the original configuration range), so that fg _mi , where 13⁄4 is the first preset value.

(4) The eighth position h is determined outside the B end point (ie, the right side outside the original configuration range) such that he < m ₂ , where m ₂ is the second preset value.

(5) After determining the above four position points, adjust the configuration range by the following conditions: judge [g, f] Whether the number of new ONUs included in the range is greater than the number of new ONUs included in the range of [e,h]: If greater than, the new configuration range is [g,f]; otherwise, the new configuration range is [e, h].

This implementation mode is also to meet the requirements of the PON system after the adjustment configuration. In the case that the registered ONU and the OLT are in normal communication within the original configuration range, as much as possible, the new ONU is also included in the communication range of the OLT.

This implementation mode directly compares the number of new ONUs on the left and right sides of the configuration range to determine whether the configuration range is shifted to the left or to the right. This is effective compared to the first implementation of adjusting the configuration range. Avoid configuration range adjustment deviation caused by uneven distribution of new ONUs.

In addition, it should be noted that if the passive optical network is GPON, the first preset value _mi =20Km and the second preset value m ₂ =20Km.

Correspondingly, an embodiment of the present invention further provides an apparatus for discovering an optical network unit, that is, an optical line terminal in a passive optical network system. See Figure 4 for a schematic view of the structure of the device.

In this embodiment, the apparatus 400 includes:

The gate frame broadcast unit 401 is configured to broadcast a gate frame to the optical network unit.

The receiving unit 402 is configured to receive an uplink response of the optical network unit, and if an uplink response is received outside the registered windowing time, determine that the added optical network unit exists.

The halt frame adjustment unit 403 is configured to calculate, when the receiving unit determines that the added optical network unit exists, calculate the number of frames of the halt frame sent by the optical line terminal to the optical network unit.

The halt frame sending unit 404 is configured to broadcast the halt frame to the optical network unit according to the frame number of the adjusted halt frame calculated by the halt frame adjusting unit.

The obtaining unit 405 is configured to obtain a serial number and ranging information of the newly added optical network unit.

Further, as shown in FIG. 5, the obtaining unit includes:

The sequence number request sending unit 501 is configured to send a sequence number request to the optical network unit.

The sequence number receiving unit 502 is configured to receive the sequence number returned by the newly added optical network unit after the request sending unit sends the request to the optical network unit.

The optical network unit label assigning unit 503 is configured to allocate an optical network unit label, that is, an ONUID, for each newly added optical network unit after obtaining the serial number of the newly added optical network unit.

The ranging information obtaining unit 504 is configured to send a ranging request to the newly added optical network unit, and receive Added ranging information returned by the optical network unit.

After the obtaining unit obtains the serial number and ranging information of the newly added ONU, the configuration range of the PON system can also be adjusted, so that the OLT can also register the new ONU in the adjusted configuration range. Correspondingly, as shown in FIG. 4, the apparatus for discovering an optical network unit in the embodiment of the present invention may further include:

The configuration range adjusting unit 406 is configured to adjust the configuration range of the passive optical network after the acquiring unit acquires the serial number and the ranging information of the newly added optical network unit, so that the OLT performs the new ONU in the adjusted configuration range. Automatic discovery and online registration and other operations.

Further, referring to FIG. 6, as a first implementation manner of the configuration range adjusting unit, the specific implementation may include:

The first location determining unit 601 is configured to search for a registered ONU closest to the endpoint A in the configuration range [A, B], and record the location of the registered ONU as the first location a, where A a<B and a, A, and B are natural numbers.

The second location determining unit 602 is configured to search for a registered ONU closest to the endpoint of the B in the configuration range [A, B], and record the location of the registered ONU as the second location b, where a<b < B , b is a natural number.

The third position determining unit 603 is configured to calculate an average value of the distance between the ONU and the a point added outside the A endpoint, and record the third position c, where c A, c are natural numbers.

The fourth position determining unit 604 is configured to calculate an average value of the distance between the ONU and the b point added outside the B end point, and record the fourth position d, where d > B, d is a natural number.

The first adjusting sub-unit 605 is configured to adjust the configuration range of the passive optical network according to the following conditions: If Ac < Bb, the configuration range is shifted to the left (Ac), and the adjusted configuration range is [c, B-(Ac). )];

If d-B < a- A , the configuration range is shifted to the right (d-B), and the adjusted range is [A+(d-B), d].

Further, as shown in FIG. 6, the configuration range adjusting unit further includes a second adjusting sub-unit 606, configured to adjust the configuration of the passive optical network according to the principle of proximity when both conditions of Ac < Bb and dB < aA are satisfied. The range (that is, the area to be adjusted to the area closest to the original configuration range) includes: If ac < db , the configuration range is shifted to the left (Ac), and the adjusted configuration range is [c, B-(Ac)];

If a-c > d-b , the configuration range is shifted to the right (d-B), and the adjusted configuration range is [A+(d-B),d].

The final range determined by the configuration range adjustment unit needs to be met: It can communicate with the registered ONU in the original configuration range; it can also communicate with as many new ONUs as possible, and register and activate the new ONU.

It should be noted here that if the passive optical network is GPON, the configuration range needs to meet the B-A 20Km.

Further, as shown in FIG. 7, the second implementation manner of the configuration range adjusting unit may specifically include:

The fifth location determining unit 701 is configured to search for a registered ONU closest to the endpoint A in the configuration range [A, B], and record the location of the registered ONU as the fifth location e, where A e<B and e, A, and B are natural numbers.

The sixth location determining unit 702 is configured to search for a registered ONU closest to the endpoint of the B in the configuration range [A, B], and record the location of the registered ONU as the sixth location f, where e<f < B , f is a natural number.

The seventh position determining unit 703 is configured to determine a seventh position g outside the A endpoint, so that (fg) m _i , where, ! ^ is the first preset value.

The eighth position determining unit 704 is configured to determine an eighth position h outside the B endpoint, so that (h-e)

< m ₂ , where m ₂ is a second preset value.

The third adjustment subunit 705 is configured to adjust the configuration range of the passive optical network according to the following conditions: if the number of new ONUs included in the [g, f] range is greater than the number of new ONUs included in the range of [e, h] If the number is adjusted, the configuration range is [g, f]; otherwise, the adjusted configuration range is [e, h].

Further, if the passive optical network is GPON, the first preset value mf OKm, and the second preset value m ₂ = 20Km. Therefore, the adjusted configuration range does not exceed 20Km.

Correspondingly, the embodiment of the present invention further provides a passive optical network system, as shown in FIG. 8, which is a schematic structural diagram of a passive optical network system.

In this embodiment, the passive optical network system includes: The optical line terminal 801 is configured to broadcast a gate frame to the optical network unit. If the uplink response of the optical network unit is received outside the registration window opening time, it is determined that the optical network unit is added, and the number of frames of the halt frame is adjusted, and the adjustment is performed. The frame number of the rear halt frame broadcasts a halt frame to the optical network unit; the optical line terminal is further configured to acquire the sequence number and ranging information of the newly added optical network unit;

The optical network unit 802 is configured to receive a gate frame of the optical line terminal, and return an uplink response to the optical network unit. The optical network unit is further configured to receive a halt frame sent by the optical line terminal according to the adjusted number of frames of the halt frame, and The line terminal returns the serial number and ranging information.

Further, the optical line terminal in the passive optical network system of the embodiment of the present invention is further configured to adjust the configuration range of the passive optical network, so that the OLT automatically discovers and registers the new ONUs in the adjusted configuration range. operating.

It should be noted here that the optical distribution network (ODN) in Figure 8 is mainly used to provide optical transmission between the OLT and the ONU. In addition, the specific structure of the optical line terminal in the passive optical network system of the embodiment of the present invention can be seen in FIG. 4, and details are not described herein again.

It will be apparent to those skilled in the art from the above description of the embodiments that all or part of the steps of the above embodiments may be implemented by means of software plus a necessary general hardware platform. Based on such understanding, the technical solution of the present invention, which is essential or contributes to the prior art, may be embodied in the form of a software product, which may be stored in a storage medium such as a ROM/RAM or a disk. , an optical disk, etc., includes instructions for causing a computer device (which may be a personal computer, server, or network device, etc.) to perform the methods described in various embodiments of the present invention or portions of the embodiments.

It is to be noted that the various embodiments in the present specification are described in a progressive manner, and the same similar parts between the various embodiments may be referred to each other, and each embodiment focuses on different embodiments from other embodiments. At the office. In particular, for the device and the system embodiment, since it is basically similar to the method embodiment, the description is relatively simple, and the relevant parts can be referred to the description of the method embodiment. The apparatus and system embodiments described above are merely illustrative, wherein the units illustrated as separate components may or may not be physically separate, and the components displayed as units may or may not be physical units, ie may be located One place, or it can be distributed to multiple network elements. You can choose some or all of the modules to achieve this according to actual needs. The purpose of the example scheme. Those of ordinary skill in the art can understand and implement without any creative effort.

The above description is only the preferred embodiment of the present invention and is not intended to limit the scope of the present invention. Any modifications, equivalents, improvements, etc. made within the spirit and scope of the invention are intended to be included within the scope of the invention.

Claims

Rights request

A method for discovering an optical network unit, comprising:

The optical line terminal adjusts the number of frames of the halt frame, and broadcasts the halt frame to the optical network unit according to the adjusted number of frames of the halt frame;

The method according to claim 1, wherein the adjusting the number of frames of the halt frame by the optical line terminal comprises:

The optical line terminal calculates the frame number N of the adjusted halt frame according to D/V*2+48 μ s+2 μ s < 125 μ s*N, where

N is the number of frames for adjusting the halt frame;

D is the maximum physical distance between the optical line terminal and the optical network unit in the passive optical network;

V is the transmission speed of light in the optical fiber;

48 μ s is the random delay time of the optical line termination;

2 μ s is the differential delay time for the optical line terminal;

125 μs is the time of a halt frame.

The method according to claim 1 or 2, wherein the method further comprises: adjusting the configuration range of the passive optical network after acquiring the serial number and the ranging information of the newly added optical network unit.

4. The method of claim 3, wherein

The configuration range of the adjusted passive optical network includes:

In the configuration range [A, B], find the optical network unit closest to the endpoint A, and record the location of the optical network unit as the first location a, where A a<B JL a, A, and B are natural numbers; In the configuration range [A, B], find the optical network unit closest to the endpoint B, and record the location of the optical network unit as the second location b, where a<b: B, b is a natural number;

Calculating an average value of the distance between the newly added optical network unit and the point a outside the A endpoint, and recording it as the third position c, where c A, c are natural numbers; Calculating the average value of the distance between the newly added optical network unit and the b point outside the B endpoint, and recording it as the fourth position d, where d>B, d is a natural number;

If A-c<B-b, the configuration range is shifted to the left by A-c, and the adjusted configuration range is [c, B-(A-c)];

If d-B < a-A, the configuration range is shifted to the right by d-B, and the adjusted configuration range is [A+(d-B), d].

5. The method according to claim 4, wherein the method further comprises: if A-c<B-b, and d-B<a-A, performing the following judgment:

If a-c < d-b, the configuration range is shifted to the left by the distance of A-c, and the adjusted configuration range is [c, B-(A-c)];

If a-c > d-b, the configuration range is shifted to the right by d-B, and the adjusted configuration range is [A+(d-B), d].

6. The method of claim 3, wherein

The configuration range of the adjusted passive optical network includes:

In the configuration range [A, B], find the optical network unit closest to the endpoint A, and record the location of the optical network unit as the fifth location e, where A e<BJLe, A, and B are natural numbers; [A, B], find the optical network unit closest to the end point of B, and record the position of the optical network unit as the sixth position f, where e<f B, f is a natural number;

Determine the seventh position g outside the A endpoint, so that fg < _mi , where, ! ^ is the first preset value; determining the eighth position h outside the B endpoint, such that he <m ₂ , where m ₂ is the second preset value; determining the number of optical network units included in the range [g, f] Whether it is greater than the number of optical network units included in the range of [e,h]: If greater than, the new configuration range is [g, f]; otherwise, the new configuration range is [e, h].

7. A device for discovering an optical network unit, the device comprising:

a halt frame adjustment unit, configured to calculate, when the receiving unit determines that a new optical network unit exists, calculate a frame number of a half frame sent by the optical line terminal to the optical network unit; a halt frame sending unit, configured to broadcast a halt frame to the optical network unit according to the frame number of the adjusted half frame calculated by the halt frame adjusting unit;

The device according to claim 7, wherein the device further comprises: a configuration range adjusting unit, configured to: after the acquiring unit acquires the serial number and ranging information of the newly added optical network unit, The range of configurations of passive optical networks.

9. The device according to claim 8, wherein the configuration range adjusting unit comprises:

a first location determining unit, configured to search for an optical network unit closest to the endpoint A in the configuration range [A, B], and record the location of the network unit as the first location a, where &<8 and &, A and B is a natural number;

a second location determining unit, configured to search for an optical network unit closest to the endpoint of the B in the configuration range [A, B], and record the location of the network unit as the second location b, where a<b: B, b is Natural number;

a third location determining unit, configured to calculate an average value of a distance between the newly added optical network unit and the a point outside the A endpoint, and record the third location c, where c A, c are natural numbers;

a fourth position determining unit, configured to calculate an average value of the distance between the newly added optical network unit and the b point outside the B endpoint, and record the fourth position d, where d > B, d is a natural number;

a first adjustment subunit, configured to adjust a configuration range of the passive optical network according to the following conditions, including: if Ac < Bb, shifting the configuration range to the left by the distance of Ac, and the adjusted configuration range is [c, B -(Ac)];

The system for discovering a newly added optical network unit according to claim 9, wherein the configuration range adjusting unit further comprises:

The second adjustment subunit is configured to adjust the configuration range of the passive optical network according to the following conditions when A-c < B-b and d-B < a-A:

If ac < db, the configuration range is shifted to the left by the distance of Ac, and the adjusted configuration range is [c, B-(Ac)]; If ac > db, the configuration range is shifted right by dB, and the adjusted configuration range is [A+(dB), d].

The device according to claim 8, wherein the configuration range adjusting unit specifically includes:

a fifth location determining unit, configured to search for an optical network unit closest to the endpoint A in the configuration range [A, B], and record the location of the network unit as a fifth location e, where 6<8 and 6, A and B is a natural number;

a sixth position determining unit, configured to search for an optical network unit closest to the end point B in the configuration range [A, B], and record the position of the network unit as a sixth position f, where e<f B, f is a natural number ;

a seventh position determining unit, configured to determine a seventh position g, ^(f-g) m! outside the A endpoint, wherein, ! ^ is the first preset value;

An eighth position determining unit, configured to determine an eighth position h outside the B endpoint, such that (he) m ₂ , wherein m ₂ is a second preset value;

The third adjustment subunit is configured to adjust the configuration range of the passive optical network, and specifically includes: if the number of optical network units included in the [g, f] range is greater than the number of optical network units included in the [e, h] range Then, the adjusted configuration range is [g, f]; otherwise, the adjusted configuration range is [e, h].

12. A passive optical network system, the system comprising:

The optical line terminal is configured to broadcast a gate frame to the optical network unit. If the uplink response of the optical network unit is received outside the registration window opening time, it is determined that the optical network unit is added, and the number of frames of the halt frame is adjusted, and the adjustment is performed. The frame number of the halt frame broadcasts a halt frame to the optical network unit; the optical line terminal is further configured to acquire a sequence number and ranging information of the newly added optical network unit;

An optical network unit, configured to receive a gate frame of the optical line terminal, and return an uplink response to the optical network unit; the optical network unit is further configured to receive, by the optical line terminal, the number of frames according to the adjusted half frame The halt frame, and returns the serial number and ranging information to the optical line terminal.

13. The system of claim 12, wherein

The optical line terminal is further configured to adjust a configuration range of the passive optical network system.