CN109429118B

CN109429118B - Bandwidth allocation method, device and system

Info

Publication number: CN109429118B
Application number: CN201710787320.XA
Authority: CN
Inventors: 张伟良; 袁立权
Original assignee: ZTE Corp
Current assignee: ZTE Corp
Priority date: 2017-09-04
Filing date: 2017-09-04
Publication date: 2022-03-01
Anticipated expiration: 2037-09-04
Also published as: WO2019042457A1; CN109429118A

Abstract

The invention provides a bandwidth allocation method, a device and a system, wherein the method comprises the following steps: the optical line termination OLT divides the upstream bandwidth within a period into a fixed number of bandwidth entries, wherein one or more of said bandwidth entries is used for one of: ranging, initial communication, and allocation to a designated ONU; and the OLT issues the bandwidth items to an Optical Network Unit (ONU). The invention solves the technical problem of overlarge transmission delay of the passive optical network in the related technology.

Description

Bandwidth allocation method, device and system

Technical Field

The present invention relates to the field of optical communications, and in particular, to a method, an apparatus, and a system for allocating bandwidth.

Background

Fig. 1 is a diagram of a point-to-multipoint passive optical Network architecture in the related art, the passive optical Network architecture in the related art is a point-to-multipoint Network topology as shown in fig. 1, one optical Line Terminal (OLT for short) is connected to a plurality of optical Network units (ONU for short) via an optical Distribution Network (ODN for short), a downlink direction (OLT to ONU) operates in a Time Division Multiplexing (TDM) manner, and an uplink direction (ONU to OLT) operates in a Time Division Multiplexing Access (TDMA) manner.

Transmission delays in passive optical networks include: optical transmission delay, delay caused by finding ONU opening quiet window, bandwidth allocation delay, etc. The optical transmission delay is related to the fiber distance, and the transmission time of 20KM is about 100 us. Both the open quiet window and the dynamic bandwidth scheduling can cause significant delay to the traffic carried by the PON.

(1) Delay from opening a quiet window. In order to find an ONU and to avoid a collision with normal services when ranging the ONU, the OLT needs to open a quiet window, fig. 2 is a schematic diagram illustrating an influence of the quiet window on a working ONU during ONU registration in the related art of the present invention, as shown in fig. 2, the quiet window belongs to overhead caused by initialization of channel connection between the OLT and the ONU, and the ONU which normally works during the quiet window cannot normally communicate with the OLT. If the ONU in normal operation has uplink data to send right at the beginning of the quiet window, it is necessary to wait for the quiet window to end before sending the uplink data, and in this case, the uplink data sent by the ONU in normal operation may cause delay.

(2) Delay due to dynamic bandwidth scheduling. In order to maximally utilize the downlink bandwidth and the uplink bandwidth, the conventional passive optical network system generally adopts dynamic bandwidth scheduling, the dynamic bandwidth allocation is generally performed based on the bandwidth request of the ONU or the detection of the ONU traffic by the OLT itself, the dynamic bandwidth scheduling can improve the bandwidth utilization rate, but has a certain hysteresis, and may bring a large delay to a service, as shown in fig. 3, fig. 3 is a schematic diagram of a delay caused by the bandwidth allocation based on the request in the related art of the present invention.

With the development of mobile networks, passive optical networks are becoming one of the load-bearing technologies of mobile fronthaul, mobile backhaul, sensor networks, and car networking. However, the transmission delay requirement of the mobile network is very strict, and the current passive optical network system and the working mode thereof are difficult to meet the requirement. The passive optical network applied to mobile bearer needs network architecture modification, working mechanism optimization and the like, and is greatly different from the traditional FTTH (fiber to the home) and FTTB (fiber to the building) application scenarios.

The solution in the related art is to implement ONU discovery and ranging through the second channel, and replace dynamic bandwidth allocation with static bandwidth allocation, but the second channel may bring large system overhead and cost, resulting in unnecessary resource waste.

In view of the above problems in the related art, no effective solution has been found at present.

Disclosure of Invention

The embodiment of the invention provides a bandwidth allocation method, a bandwidth allocation device and a bandwidth allocation system, which are used for at least solving the technical problem of overlarge transmission delay of a passive optical network in the related technology.

According to an embodiment of the present invention, there is provided a bandwidth allocation method including: the optical line termination OLT divides the upstream bandwidth within a period into a fixed number of bandwidth entries, wherein one or more of said bandwidth entries is used for one of: ranging, initial communication, and allocation to a designated ONU; and the OLT issues the bandwidth items to an Optical Network Unit (ONU).

Optionally, one or more of the bandwidth entries are identified as one of the following attributes: to-be-measured, unallocated, allocated; wherein the bandwidth entry to be measured is used for measuring the distance; the unallocated representation indicates that the bandwidth entry is used for initial communication; the allocated indicates that the bandwidth entry has been allocated to a specified ONU.

Optionally, the to-be-ranging indicates that the bandwidth entry is used for ranging, including: and the OLT issues a first bandwidth to the ONU and records sending time, wherein the first bandwidth is identified as one or more bandwidth items to be measured.

Optionally, after the OLT issues the first bandwidth to the ONU, the method further includes: after receiving the first bandwidth, the ONU selects one or more bandwidth entries in the first bandwidth, and sends a first bandwidth response to the OLT in the bandwidth entries, wherein the first bandwidth response comprises ONU identity information and the number of the bandwidth entries;

optionally, after the ONU sends the first bandwidth response to the OLT, the method further includes: and the OLT receives the first bandwidth response and records receiving time, acquires ONU identity information, calculates a ranging result of the ONU corresponding to the ONU identity information according to the sending time of the first bandwidth and the receiving time of the first bandwidth response, and acquires a logical distance between the OLT and the ONU in the passive optical network.

Optionally, after obtaining the logical distance from the OLT to the ONU, the method further includes: the OLT updates the local logical distance between the OLT and the ONU or issues the logical distance between the OLT and the ONU to the ONU;

optionally, after the OLT obtains the logical distance between the OLT and the ONU in the passive optical network, the method further includes: and the OLT allocates a bandwidth entry for the ONU, and the bandwidth entry is used for the ONU to send data and/or management information to the OLT.

Optionally, the unallocated representation of the bandwidth entry for initial communication includes: and the OLT issues a second bandwidth to the ONU, wherein the second bandwidth is one or more bandwidth items marked as unallocated.

Optionally, the unallocated representation of the bandwidth entry is for initial communication, further comprising: and after receiving the second bandwidth, the ONU selects one or more bandwidth entries in the second bandwidth, and sends a second bandwidth response to the OLT in the bandwidth entries, wherein the second bandwidth response comprises ONU identity information.

Optionally, after the ONU sends the second bandwidth response, the method further includes: and the OLT receives the second bandwidth response and acquires the ONU identity, and allocates a bandwidth item for the ONU, wherein the bandwidth item is used for the ONU to send data and/or management information to the OLT.

Optionally, the allocating indicating that the bandwidth entry has been allocated to the specified ONU comprises: when the bandwidth entries are multiple, there may be no interval or an interval between the bandwidth entries, and when there is an interval between the bandwidth entries, the intervals between the bandwidth entries are the same or different, and the minimum value of the intervals satisfies the delay requirement of the system.

Optionally, after the bandwidth entry has been allocated to the specified ONU, the method further includes: and the specified ONU sends data and/or management information to the OLT in the bandwidth item.

Optionally, before the bandwidth entry has been allocated to the specified ONU, the method further includes: and the OLT acquires the ONU identity information.

Optionally, the ONU identity information includes at least one of: serial number SN, MAC address, password, registration ID.

Optionally, before the OLT issues one or more bandwidth entries for initial communication to the ONU, the method further includes: and the OLT acquires a logical distance between the OLT and the ONU.

Optionally, before the OLT issues one or more bandwidth entries for initial communication to the ONU, the method further includes: the OLT sets the longest logical distance between the OLT and the ONU, wherein the logical distance between the OLT and all the ONUs is smaller than or equal to the longest logical distance.

Optionally, after the OLT sets the longest logical distance between the OLT and the ONU, the method further includes: and the OLT issues the longest logical distance between the OLT and the ONU.

Optionally, the acquiring, by the OLT, a logical distance from the ONU includes: the logical distance between the OLT and the ONU is configured into the OLT.

Optionally, the acquiring, by the OLT, a logical distance from the ONU includes: the OLT measures the distance of the ONU on a third wavelength and obtains the distance measurement result of the OLT and the ONU on the third wavelength; and the OLT calculates the logical distance between the OLT and the ONU on the working wavelength according to the ranging result on the third wavelength and the wavelength relation.

Optionally, the sending, by the OLT, the longest logical distance between the OLT and the ONU includes: and the ONU tests the logical distance between the ONU and the OLT through an Optical Time Domain Reflectometer (OTDR) technology, wherein the wavelength used by the OTDR is different from the working wavelength.

Optionally, the sending, by the OLT, the longest logical distance between the OLT and the ONU includes: the OLT sends a ranging data packet with sending time; the ONU receives the ranging data packet, records local receiving time, obtains sending time in the ranging data packet, and calculates the logical distance between the ONU and the OLT according to the local receiving time and the sending time; wherein the OLT and the ONU are provided with a circadian ToD condition.

Optionally, after obtaining the logical distance from the OLT, the ONU further includes: the ONU obtains the longest logical distance between the OLT and the ONU; and the ONU carries out local compensation, wherein the compensation is that the logic distance between the OLT and the ONU is subtracted from the longest logic distance.

Optionally, the logic distance between the OLT and the ONU is configured in the OLT, further comprising: the branch optical fiber connected with the ONU is provided with an electronic tag; the OLT associates the electronic tag, the difference value between the logical distance between the ONU and the OLT and the longest logical distance, and the OLT issues the electronic tag and the difference value; and the ONU identifies the electronic tag on the connected branch optical fiber, obtains the difference value corresponding to the electronic tag and carries out local compensation.

According to an embodiment of the present invention, there is provided another bandwidth allocation method, including: the optical line termination OLT divides the upstream bandwidth within a period into a fixed number of bandwidth entries, wherein one or more of said bandwidth entries is used for one of: ranging, initial communication, and allocation to a designated ONU; and the OLT issues the bandwidth items to an Optical Network Unit (ONU).

Optionally, the to-be-ranging indicates that the bandwidth entry is used for ranging, further including: the OLT receives a first bandwidth response sent by the ONU and records receiving time, obtains ONU identity information and the serial number of a bandwidth item from the first bandwidth response, and calculates the ranging result of the ONU corresponding to the ONU identity information according to the sending time of the first bandwidth and the receiving time of the first bandwidth response to obtain the logical distance between the OLT and the ONU in the passive optical network.

optionally, after obtaining the logical distance from the OLT to the ONU, the method further includes: and the OLT allocates a bandwidth entry for the ONU, and the bandwidth entry is used for the ONU to send data and/or management information to the OLT.

Optionally, the unallocated representation of the bandwidth entry for initial communication further includes: and after receiving a second bandwidth response sent by the ONU, the OLT obtains ONU identity information, and allocates a bandwidth item for the ONU, wherein the bandwidth item is used for the ONU to send data and/or management information to the OLT.

According to an embodiment of the present invention, there is provided a bandwidth allocation method including: an optical network unit ONU receives bandwidth entries issued by an optical line terminal OLT, wherein one or more of the bandwidth entries are used for one of the following: ranging, initial communication, assigned to a designated ONU.

Optionally, one or more of the bandwidth entries are identified as one of the following attributes: to-be-measured, unallocated, allocated; wherein the bandwidth entry to be measured is used for measuring the distance; the unallocated representation indicates that the bandwidth entry is used for initial communication; the allocated indicates that the bandwidth has been allocated to a specified ONU.

Optionally, the to-be-ranging indicates that the bandwidth entry is used for ranging, including: and the ONU receives a first bandwidth issued by the OLT, wherein the first bandwidth is identified as one or more bandwidth items to be measured.

Optionally, after receiving the first bandwidth issued by the OLT, the ONU further includes: the ONU selects one or more bandwidth entries in the first bandwidth, and sends a first bandwidth response to the OLT within the bandwidth entries, wherein the first bandwidth response comprises ONU identity information and the number of the bandwidth entry.

Optionally, the unallocated representation of the bandwidth entry for initial communication includes: and the ONU receives a second bandwidth issued by the OLT, wherein the second bandwidth is one or more bandwidth items marked as unallocated.

Optionally, after receiving the second bandwidth issued by the OLT, the ONU further includes: and the ONU selects one or more bandwidth entries in the second bandwidth, and sends a second bandwidth response to the OLT in the bandwidth entries, wherein the second bandwidth response comprises ONU identity information.

Optionally, the allocating indicates that the bandwidth has been allocated to the specified ONU, and the allocating includes: when the bandwidth entries are multiple, there may be no interval or an interval between the bandwidth entries, and when there is an interval between the bandwidth entries, the intervals between the bandwidth entries are the same or different, and the minimum value of the intervals satisfies the delay requirement of the system.

According to another embodiment of the present invention, there is provided a bandwidth allocation apparatus applied to an optical line terminal OLT, including: an allocation module, configured to divide an uplink bandwidth in one cycle into a fixed number of bandwidth entries, where one or more of the bandwidth entries are used for one of: ranging, initial communication, and allocation to a designated ONU; and the issuing module is used for issuing the bandwidth items to an Optical Network Unit (ONU).

Optionally, each of the bandwidth entries is identified as one of the following attributes: to-be-measured, unallocated, allocated; wherein the to-be-ranging indicates that a current bandwidth entry is used for ranging; the unallocated representation indicates a current bandwidth for an initial communication; the allocated indicates that the current bandwidth has been allocated to the specified ONU.

According to another embodiment of the present invention, another bandwidth allocation apparatus is provided, which is applied to an optical network unit ONU, and includes: a receiving module, configured to receive bandwidth entries issued by an optical line terminal OLT, where one or more of the bandwidth entries are used to: ranging, initial communication, assigned to a designated ONU.

According to yet another embodiment of the present invention, there is provided a bandwidth distribution system including: an optical line terminal OLT and an optical network unit ONU, wherein the OLT comprises: an allocation module, configured to divide an uplink bandwidth in one cycle into a fixed number of bandwidth entries, where one or more of the bandwidth entries are used for one of: ranging, initial communication, and allocation to a designated ONU; the issuing module is used for issuing the bandwidth items to an Optical Network Unit (ONU); the ONU includes: a receiving module, configured to receive the bandwidth entry sent by the OLT.

Optionally, each one or more of the bandwidth entries is identified as one of the following attributes: to-be-measured, unallocated, allocated; wherein the to-be-ranging indicates that a current bandwidth entry is used for ranging; the unallocated representation indicates a current bandwidth for an initial communication; the allocated indicates that the current bandwidth has been allocated to the specified ONU.

Optionally, the OLT further includes: and the acquisition module is used for acquiring the logical distance between the ONU and the bandwidth item before the issuing module issues the one or more bandwidth items for initial communication to the ONU.

Optionally, the OLT further includes: a setting module, configured to set a longest logical distance between the OLT and the ONU before the issuing module issues the one or more bandwidth entries for initial communication to the ONU, where a logical distance between the OLT and all the ONUs is less than or equal to the longest logical distance.

According to still another embodiment of the present invention, there is also provided a storage medium. The storage medium is configured to store program code for performing the steps of:

dividing an upstream bandwidth in a cycle into a fixed number of bandwidth entries, wherein one or more of the bandwidth entries are for one of: ranging, initial communication, and allocation to a designated ONU;

and issuing the bandwidth items to an Optical Network Unit (ONU).

With the present invention, the OLT divides the upstream bandwidth within a period into a fixed number of bandwidth entries, wherein one or more of said bandwidth entries are used for one of: ranging, initial communication, and allocation to a designated ONU; and the OLT issues the bandwidth items to an Optical Network Unit (ONU). The problem of passive optical network transmission delay is effectively solved at low cost by fixedly distributing bandwidth, and the technical problem of overlarge passive optical network transmission delay in the related technology is solved.

Drawings

The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the invention without limiting the invention. In the drawings:

fig. 1 is a diagram of a point-to-multipoint passive optical network architecture according to the related art of the present invention;

fig. 2 is a schematic diagram illustrating the effect of a quiet window on a working ONU during ONU registration in the related art according to the present invention;

FIG. 3 is a diagram illustrating delay caused by bandwidth allocation based on requests in the related art;

FIG. 4 is a flow diagram of a bandwidth allocation method according to an embodiment of the present invention;

fig. 5 is a block diagram of a structure of a bandwidth allocation apparatus according to an embodiment of the present invention;

FIG. 6 is a block diagram of a bandwidth allocation system according to an embodiment of the present invention;

FIG. 7 is an interaction diagram of a first embodiment of the invention;

FIG. 8 is an interaction diagram of a second embodiment of the present invention;

FIG. 9 is an interaction diagram of a third embodiment of the present invention;

FIG. 10 is an interaction diagram of a fourth embodiment of the present invention;

fig. 11 is an interaction diagram of the fifth embodiment of the present invention.

Detailed Description

The invention will be described in detail hereinafter with reference to the accompanying drawings in conjunction with embodiments. It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict.

It should be noted that the terms "first," "second," and the like in the description and claims of the present invention and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order.

Example 1

The embodiment of the present application may operate on the network architecture shown in fig. 1, as shown in fig. 1, the network architecture includes: OLT and ONU.

In this embodiment, a bandwidth allocation method operating in the above network architecture is provided, and fig. 4 is a flowchart of the bandwidth allocation method according to the embodiment of the present invention, as shown in fig. 4, the flowchart includes the following steps:

step S402, the OLT divides the upstream bandwidth in one period into a fixed number of bandwidth entries, where one or more bandwidth entries are used for one of: ranging, initial communication, and allocation to a designated ONU;

in step S404, the OLT issues the bandwidth entry to the ONU.

Through the above steps, the OLT divides the upstream bandwidth in one period into a fixed number of bandwidth entries, where one or more bandwidth entries are used for one of: ranging, initial communication, and allocation to a designated ONU; and the OLT issues the bandwidth items to the optical network units ONU. The problem of passive optical network transmission delay is effectively solved at low cost by fixedly distributing bandwidth, and the technical problem of overlarge passive optical network transmission delay in the related technology is solved.

Alternatively, the executing subject of the above steps may be the OLT, a management device of the OLT, and the like, but is not limited thereto.

Optionally, the one or more bandwidth entries are identified as one of the following attributes: to-be-measured, unallocated, allocated; wherein the to-be-measured distance represents a bandwidth entry for ranging; no allocated representation bandwidth entry for initial communication; the allocated indicates that a bandwidth entry has been allocated to the specified ONU.

Optionally, the using the bandwidth entry for ranging by the distance to be measured includes: and the OLT issues a first bandwidth to the ONU and records the sending time, wherein the first bandwidth is identified as one or more bandwidth items to be measured.

Optionally, after the OLT issues the first bandwidth to the ONU, the method further includes: after receiving the first bandwidth, the ONU selects one or more bandwidth entries in the first bandwidth, and sends a first bandwidth response to the OLT in the bandwidth entries, wherein the first bandwidth response comprises ONU identity information and the number of the bandwidth entry;

optionally, after the ONU sends the first bandwidth response to the OLT, the method further includes: and the OLT receives the first bandwidth response and records the receiving time, acquires the ONU identity information, calculates the ranging result of the ONU corresponding to the ONU identity information according to the sending time of the first bandwidth and the receiving time of the first bandwidth response, and acquires the logical distance between the OLT and the ONU in the passive optical network.

optionally, after the OLT obtains the logical distance between the OLT and the ONU in the passive optical network, the method further includes: the OLT allocates bandwidth entries for the ONUs, and the bandwidth entries are used for the ONUs to send data and/or management information to the OLT.

Optionally, the unallocated representation bandwidth entry for the initial communication includes: and the OLT transmits a second bandwidth to the ONU, wherein the second bandwidth is one or more bandwidth items marked as unallocated.

Optionally, the unallocated representation bandwidth entry is used for initial communication, and further includes: and after receiving the second bandwidth, the ONU selects one or more bandwidth entries in the second bandwidth and sends a second bandwidth response to the OLT in the bandwidth entries, wherein the second bandwidth response comprises ONU identity information.

Optionally, after the ONU sends the second bandwidth response, the method further includes: and the OLT receives the second bandwidth response to obtain the ONU identity, and allocates a bandwidth item for the ONU, wherein the bandwidth item is used for the ONU to send data and/or management information to the OLT.

Optionally, the allocating indicates that the bandwidth entry has been allocated to the specified ONU, and the allocating includes: when the bandwidth entries are multiple, the bandwidth entries can have no interval or have intervals, when the bandwidth entries have intervals, the intervals between the bandwidth entries are the same or different, and the minimum value of the intervals meets the delay requirement of the system.

Optionally, after the bandwidth entry has been allocated to the specified ONU, the method further includes: the designated ONU transmits data and/or management information to the OLT within a bandwidth entry.

Optionally, before the bandwidth entry has been allocated to the specified ONU, the method further includes: and the OLT acquires the identity information of the ONU.

In this embodiment, the ONU identity information includes at least one of the following: serial number SN, MAC address, password, registration ID.

Optionally, before the OLT issues one or more bandwidth entries for initial communication to the ONU, the method further includes: the OLT acquires a logical distance from the ONU.

Optionally, before the OLT issues one or more bandwidth entries for initial communication to the ONU, the method further includes: the OLT sets the longest logic distance between the OLT and the ONU, wherein the logic distance between the OLT and all the ONUs is smaller than or equal to the longest logic distance.

Optionally, the acquiring, by the OLT, a logical distance from the ONU includes: the OLT measures the distance of the ONU at the third wavelength and obtains the distance measurement result of the OLT and the ONU at the third wavelength; and the OLT calculates the logical distance between the OLT and the ONU on the working wavelength according to the ranging result on the third wavelength and the wavelength relation.

Optionally, the sending, by the OLT, the longest logical distance between the OLT and the ONU includes: and the ONU tests the logical distance between the ONU and the OLT through an OTDR technology, wherein the wavelength used by the OTDR is different from the working wavelength.

Optionally, the sending, by the OLT, the longest logical distance between the OLT and the ONU includes: the OLT sends a ranging data packet with sending time; the ONU receives the ranging data packet, records local receiving time, obtains sending time in the ranging data packet, and calculates the logical distance between the ONU and the OLT according to the local receiving time and the sending time; wherein, OLT and ONU have Time of Day (ToD) condition.

Optionally, the configuring of the logical distance between the OLT and the ONU in the OLT further includes: the branch optical fiber connected with the ONU is provided with an electronic tag; the OLT associates the electronic tag, the logic distance between the ONU and the OLT and the difference value between the longest logic distance, and the OLT issues the electronic tag and the difference value; and the ONU identifies the electronic tag on the connected branch optical fiber, obtains the difference value corresponding to the electronic tag and carries out local compensation.

The present embodiment further provides a bandwidth allocation method on the OLT side, including:

s11, the optical line termination OLT divides the upstream bandwidth in one period into a fixed number of bandwidth entries, wherein one or more bandwidth entries are for one of: ranging, initial communication, and allocation to a designated ONU;

and S12, the OLT issues the bandwidth items to the optical network units ONU.

Optionally, the distance to be measured represents a bandwidth entry for ranging, further including: the OLT receives a first bandwidth response sent by the ONU and records receiving time, the ONU identity information and the serial number of the bandwidth item are obtained from the first bandwidth response, and the ranging result of the ONU corresponding to the ONU of the ONU identity information is calculated according to the sending time of the first bandwidth and the receiving time of the first bandwidth response, so that the logical distance between the OLT and the ONU in the passive optical network is obtained.

Optionally, after obtaining the logical distance from the OLT to the ONU, the method further includes: and the OLT updates the local logical distance between the OLT and the ONU or issues the logical distance between the OLT and the ONU to the ONU.

Optionally, after obtaining the logical distance from the OLT to the ONU, the method further includes: the OLT allocates bandwidth entries for the ONUs, and the bandwidth entries are used for the ONUs to send data and/or management information to the OLT.

Optionally, the allocating the representation bandwidth entry for the initial communication further comprises: and after receiving the second bandwidth response sent by the ONU, the OLT obtains the identity information of the ONU, and the OLT allocates a bandwidth item for the ONU, wherein the bandwidth item is used for the ONU to send data and/or management information to the OLT.

The present embodiment further provides a bandwidth allocation method on an ONU side, including:

s21, the ONU receives bandwidth entries issued by the OLT, where one or more of the bandwidth entries are used for one of: ranging, initial communication, assigned to a designated ONU.

Optionally, the using the bandwidth entry for ranging by the distance to be measured includes: and the ONU receives a first bandwidth issued by the OLT, wherein the first bandwidth is identified as one or more bandwidth items to be measured.

Optionally, after receiving the first bandwidth issued by the OLT, the ONU further includes: the ONU selects one or more bandwidth entries in the first bandwidth, and sends a first bandwidth response to the OLT within the bandwidth entries, wherein the first bandwidth response comprises ONU identity information and the number of the bandwidth entries.

Optionally, the unallocated representation bandwidth entry for the initial communication includes: and the ONU receives a second bandwidth issued by the OLT, wherein the second bandwidth is one or more bandwidth items marked as unallocated.

Optionally, after receiving the second bandwidth issued by the OLT, the ONU further includes: the ONU selects one or more bandwidth entries in the second bandwidth, and sends a second bandwidth response to the OLT within the bandwidth entries, wherein the second bandwidth response comprises ONU identity information.

Optionally, the allocating indicates that the bandwidth has been allocated to the specified ONU, and the allocating includes: when the bandwidth entries are multiple, the bandwidth entries can have no interval or have intervals, when the bandwidth entries have intervals, the intervals between the bandwidth entries are the same or different, and the minimum value of the intervals meets the delay requirement of the system.

Optionally, the identification of the bandwidth entry includes one of: ONU identification and link identification.

Optionally, the ONU identifier includes one of: ONU-ID, Physical Link Identification (PLID). The link identification includes one of: transport Container (T-CONT), User Link Identification (ULID).

Through the above description of the embodiments, those skilled in the art can clearly understand that the method according to the above embodiments can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware, but the former is a better implementation mode in many cases. Based on such understanding, the technical solutions of the present invention may be embodied in the form of a software product, which is stored in a storage medium (e.g., ROM/RAM, magnetic disk, optical disk) and includes instructions for enabling a terminal device (e.g., a mobile phone, a computer, a server, or a network device) to execute the method according to the embodiments of the present invention.

Example 2

In this embodiment, a bandwidth allocation apparatus is further provided, and the apparatus is used to implement the foregoing embodiments and preferred embodiments, and the description of the apparatus is omitted. As used below, the term "module" may be a combination of software and/or hardware that implements a predetermined function. Although the means described in the embodiments below are preferably implemented in software, an implementation in hardware, or a combination of software and hardware is also possible and contemplated.

Fig. 5 is a block diagram of a bandwidth allocation apparatus according to an embodiment of the present invention, applied to an OLT side, and as shown in fig. 5, the apparatus includes:

an allocating module 50, configured to divide the uplink bandwidth in one period into a fixed number of bandwidth entries, where one or more bandwidth entries are used for one of: ranging, initial communication, and allocation to a designated ONU;

and the issuing module 52 is configured to issue the bandwidth entry to the ONU.

The embodiment further provides another bandwidth allocation device, which is applied to an optical network unit ONU, and includes: a receiving module, configured to receive bandwidth entries issued by an optical line terminal OLT, where one or more bandwidth entries are used for one of the following: ranging, initial communication, assigned to a designated ONU.

Optionally, each bandwidth entry is identified as one of the following attributes: to-be-measured, unallocated, allocated; the distance to be measured represents the current bandwidth item for ranging; unallocated bandwidth representing a current bandwidth for an initial communication; the allocated indicates that the current bandwidth has been allocated to the specified ONU.

Fig. 6 is a block diagram of a bandwidth allocation system according to an embodiment of the present invention, as shown in fig. 6, the system including: an optical line termination OLT60, an optical network unit ONU62, wherein,

OLT60 includes:

an allocating module 600 configured to divide the uplink bandwidth in one cycle into a fixed number of bandwidth entries, wherein one or more bandwidth entries are used for one of: ranging, initial communication, and allocation to a designated ONU;

an issuing module 602, configured to issue the bandwidth entry to an optical network unit ONU;

the ONU62 includes:

a receiving module 620, configured to receive a bandwidth entry issued by the OLT.

Optionally, the OLT further includes: and the acquisition module is used for acquiring the logical distance between the transmission module and the ONU before the transmission module transmits one or more bandwidth items for initial communication to the ONU.

Optionally, the OLT further includes: the device comprises a setting module and a sending module, wherein the setting module is used for setting the longest logical distance between the OLT and the ONU before the sending module sends one or more bandwidth items for initial communication to the ONU, and the logical distance between the OLT and all the ONUs is smaller than or equal to the longest logical distance.

It should be noted that, the above modules may be implemented by software or hardware, and for the latter, the following may be implemented, but not limited to: the modules are all positioned in the same processor; alternatively, the modules are respectively located in different processors in any combination.

Example 3

This embodiment is an alternative embodiment of the present invention, and is used to describe the present application in detail with reference to specific scenarios and implementations:

the present embodiment starts from a passive optical network architecture and bandwidth allocation, and provides a passive optical network architecture and a bandwidth allocation method, which are used in a passive optical network system to effectively solve the problem of delay in passive optical network transmission at low cost.

In the passive optical network system of this embodiment, the logical distances between all ONUs and the OLT are equal, or the equivalent logical distances between all ONUs and the OLT after entering the operating state are equal. In the passive optical network system, an OLT divides an uplink bandwidth of each period into a fixed number of entries, periodically issues the entries, and each bandwidth entry is identified as a distance to be measured, unallocated, allocated and the like, wherein the bandwidth to be measured indicates that the bandwidth entry can be used for ranging and is used for one-time ranging before all ONUs enter a working state, the unallocated indicates that the bandwidth can be used for initial communication, the ONUs can select the unallocated entry to report self information, such as identification information of SN, MAC address and the like and/or authentication information of password, registration ID and the like, the allocated entry indicates that the bandwidth entry has been allocated to a certain ONU, generally, entries of a plurality of intervals are allocated to one ONU, the intervals between the entries can be the same or different, but the minimum interval meets the delay requirement.

The ranging method of the passive optical network system in this embodiment includes the following steps:

(1) and the OLT initiates ranging, the ranging is carried out on the third wavelength, and the logical distance between the OLT and the ONU on the working wavelength is calculated according to the wavelength relation.

(2) And the ONU initiates ranging, and under the coordination of the OLT, the ONU tests the logical distance between the ONU and the OLT through an OTDR technology, wherein the wavelength used by the OTDR does not conflict with the uplink and downlink wavelength used by the passive optical network.

(3) And the OLT sends a ranging data packet with a sending time stamp, and after each ONU receives the ranging data packet, the logical distance from the OLT to the ONU is calculated according to the local receiving time and the sending time stamp carried in the ranging data packet.

(4) Passive optical network system only needing one-time ranging

The logical distances from the ONUs to the OLT are equal or controlled within a certain error range, and the OLT measures the distance of the first ONU at the working wavelength to obtain the maximum logical distance of the system.

(5) A ranging-free passive optical network system may not use ranging if the maximum logical distance of the system is already obtained in the engineering wiring and/or engineering ranging. In engineering wiring and/or engineering ranging, an engineer can use a handheld device to simulate the ONU to cooperate with the OLT to complete ranging, and the logical distance between the OLT and the tail end of each branch optical fiber in the passive optical network system is obtained.

In the method for allocating bandwidth of a passive optical network system according to this embodiment, an OLT divides an upstream bandwidth of each period into a fixed number of entries, each entry already allocated to an ONU carries an ONU identifier (ONU-ID, PLID), a link identifier (T-CONT, ULID), and the like, and indicates that the entry has been allocated, and an entry not allocated to the ONU indicates non-allocation, and the non-allocated entry may be used for initial communication of the ONU, and an online ONU may select one or more entries from the non-allocated entries to attempt to establish communication with the OLT, and after acquiring ONU-related information from the corresponding entries, the OLT may allocate the corresponding entries to the ONU, thereby establishing a communication relationship, and performing subsequent configuration and other related work, and if the ONU does not successfully acquire bandwidth allocation, may attempt other non-allocated entries to continue to establish communication with the OLT. If the passive optical network system needs one-time ranging, the OLT marks the entry as to-be-ranging after initialization, and the ONU can select one of the bandwidths marked as to-be-ranging to send a ranging response to complete ranging with the OLT, so that the OLT obtains the logical distance of the passive optical network.

In the passive optical network system of this embodiment, the OLT does not need to open a quiet window on the working wavelength or the working time slot, which avoids the delay caused by opening the quiet window, and in addition, directly and fixedly allocates the bandwidth for the ONU contention registration, the ranging, and the normal communication, and may even configure the relevant resources in the relevant bandwidth allocation, and directly complete the resource configuration after the ONU completes the registration. By dividing the upstream bandwidth of each cycle into fixed entries and allocating the entries to the ONUs at regular intervals, the delay of the ONUs obtaining bandwidth entries can be reduced. The OLT may allocate a plurality of bandwidths for registration, and one ONU to be registered selects one of them or performs contention. On the basis of the fixed allocation periodic bandwidth feature, the number of ONUs that can be connected under the OLT is small and fixed, for example, 16 ONUs. In addition, when the PON is used for mobile backhaul and mobile fronthaul, the transmission distance between the OLT and the ONU is required to be relatively short, for example, 5KM and 10 KM. Therefore, in the passive optical network system, the delay between the OLT and the ONU is controllable, and low-delay services such as mobile return, mobile forward and the like can be met to a certain extent.

Before the passive optical network starts working, the physical length or the logical length of the branch optical fiber or the logical length between the ONU and the OLT may be obtained in advance, for example, in the engineering implementation process, engineering personnel may obtain the length of the optical fiber in the engineering wiring and construction process, for example, length measurement is performed on the optical fiber, or a handheld device is connected to the branch optical fiber, and the ONU and the OLT are simulated to cooperate to complete ranging together, so as to obtain the logical distance between the OLT and the end of each branch optical fiber in the passive optical network system.

The bandwidth division entries in the embodiment are only examples, and other bandwidth division entry methods may be used in practical applications, and are within the scope of the present invention as long as the effects of the present invention are achieved. In order to realize smaller delay, the upstream bandwidth of each period can be divided into more entries, one ONU can obtain more entries in each period, and the interval between entries allocated to ONUs can be smaller.

The embodiment also includes the following implementation modes:

implementation mode one

Equidistant and at a known distance

In the passive optical network system according to the present embodiment, the lengths of the branch fibers connecting the ONUs are equal or nearly equal (the error is controlled within a certain range), and since the trunk fibers connecting the OLT and the ODN are the same for each ONU, the total lengths of the fibers between the OLT and each ONU are equal or nearly equal.

In the present embodiment, the logical distances between the OLT and the respective branch optical fiber ends in the passive optical network system are obtained in advance, and since the total lengths of the optical fibers between the OLT and the respective branch optical fiber ends are equal or nearly equal, the logical distances between the OLT and the respective ONUs are also equal or nearly equal.

In the present embodiment, the logical distance between the OLT and the ONU that is obtained in advance is arranged in the OLT.

In this embodiment, the passive optical network system supports 1 OLT and 16 ONUs. The OLT divides the bandwidth of each cycle into 48 bandwidth entries of equal length, which are numbered 1-48 for descriptive convenience, and divides the bandwidth entries into 16 groups, e.g., 1, 17, 33, 2, 18, 34, 3, 19, 35, and so on.

Fig. 7 is an interaction diagram of a first embodiment of the present invention, and the specific working steps in the embodiment include:

after the OLT completes initialization, 48 bandwidth entries are periodically issued, wherein 48 bandwidth entries are all identified as unallocated, and thus each bandwidth entry can be used for initial communication establishment between an ONU and the OLT.

After the ONU is powered on, the bandwidth items issued by the OLT are monitored, one bandwidth item with an unallocated identifier is selected, and self identity information, such as identification information of SN, MAC address and the like, and/or authentication information of password, registration ID and the like, is sent to the OLT in a time slot corresponding to the bandwidth item.

The OLT detects the identity information sent by the ONU in the bandwidth entries marked as unallocated, and if the OLT can acquire correct ONU identification information and/or authentication information and the like, fixed bandwidth entries, such as bandwidth entries numbered 1, 17 and 33, are allocated to the ONU, and the bandwidth entries are subsequently marked as allocated.

After receiving the bandwidth entries allocated by the OLT, the ONU performs normal communication with the OLT through the bandwidth entries, including sending data and/or management information.

The OLT continues to periodically issue 48 bandwidth entries, each of which has updated the corresponding allocation status.

And if the ONU does not obtain the bandwidth allocation of the OLT after reporting the self identity information in the time slot corresponding to the unallocated bandwidth item, continuously selecting the unallocated bandwidth and sending the self identity information to the OLT.

Second embodiment

Equal distance but unknown distance, one-time distance measurement

In the present embodiment, it is confirmed in advance that the logical distances between the OLT and the respective branch optical fiber ends are the same or nearly the same in the passive optical network system, and the total lengths of the optical fibers between the OLT and the respective branch optical fiber ends are the same or nearly the same, so that the logical distances between the OLT and the respective ONUs are also the same or nearly the same.

In the present embodiment, it is confirmed in advance that the logical distances between the OLT and the respective branch optical fiber ends are the same or nearly the same in the passive optical network system, but the logical distance between the OLT and the ONU is not arranged in the OLT.

Fig. 8 is an interaction diagram of a second embodiment of the present invention, and the specific working steps in this embodiment include:

after the OLT completes initialization, 48 bandwidth entries are periodically sent underground and the sending time is recorded, wherein 48 bandwidth entries are all marked as to-be-measured, and therefore each bandwidth entry can be used for measuring distance between the ONU and the OLT.

After the ONU is powered on, the bandwidth items issued by the OLT are monitored, one bandwidth item with the identification as the bandwidth item to be measured is selected, and the identity information of the ONU, such as identification information of SN, MAC address and the like, and/or authentication information of password, registration ID and the like, and the number of the selected bandwidth item are sent to the OLT in the bandwidth item.

The OLT monitors information sent by the ONU, if correct ONU identification information and/or authentication information and bandwidth entry number can be obtained, the ranging result is calculated according to the sending time and the receiving time of the corresponding bandwidth entry, the logical distance between the OLT and the ONU in the passive optical network is obtained, fixed bandwidth entries such as bandwidth entries with the numbers of 1, 17 and 33 are allocated to the ONU, and the subsequent marks of the bandwidth entries are allocated.

The OLT continues to issue 48 parts of bandwidth periodically, 3 parts of bandwidth allocated to the ONU are updated to be identified as allocated, other identifiers are identified as unallocated, and each unallocated bandwidth entry can be used for initial communication establishment between the ONU and the OLT.

After other ONUs are powered on, bandwidth items issued by the OLT are monitored, one bandwidth item with an identifier of being unallocated is selected, and self identity information, such as identification information of SN, MAC address and the like, and/or authentication information of passwords, registration ID and the like, is sent to the OLT in the bandwidth item.

The OLT detects information sent by the ONU in the bandwidth entries marked as unallocated, and if the OLT can acquire correct ONU identification information and/or authentication information and the like, fixed bandwidth entries, such as bandwidth entries numbered 2, 18 and 34, are allocated to the ONU, and the bandwidth entries are subsequently marked as allocated.

After receiving the bandwidth entries allocated by the OLT, the ONU performs normal communication with the OLT through the bandwidth entries, including sending data and/or management information to the OLT.

And if the ONU does not obtain the bandwidth allocation of the OLT after reporting the self information in the unallocated bandwidth entry, continuously selecting the unallocated bandwidth and sending the self identity information.

Third embodiment

Logical equidistant and logical distance known

In the passive optical network system according to the present embodiment, the lengths of the branch optical fibers connecting the ONUs are not equal or not equal.

In this embodiment, the logical distances corresponding to the corresponding branch optical fibers are obtained in advance, the logical distances corresponding to the branch optical fibers are recorded, and after the logical distances of all the branch optical fibers are collected, the longest logical distance is set, and the logical distances of all the branch optical fibers are less than or equal to the longest logical distance.

In this embodiment, each branch optical fiber is provided with an electronic tag, the electronic tag and the logical distance of the corresponding branch optical fiber are associated, and the electronic tag can be identified after the ONU is powered on.

In the present embodiment, the maximum logical distance and the logical distance corresponding to each branch optical fiber are both configured in the OLT of the passive optical network system.

Fig. 9 is an interaction diagram of a third embodiment of the present invention, and the specific working steps in this embodiment include:

after the OLT is powered on, 48 bandwidth entries are periodically sent down, and 48 bandwidth entries are fixedly allocated, for example, bandwidth entries 1, 17, and 33 are allocated to the ONU corresponding to the electronic tag 1, bandwidth entries 2, 18, and 34 are allocated to the ONU corresponding to the electronic tag 2, bandwidth entries 3, 19, and 35 are allocated to the ONU corresponding to the electronic tag 3, and so on, and a difference value between the logical distance of the corresponding branch optical fiber and the maximum logical distance is indicated in the bandwidth entries.

After the ONU is powered on, an electronic tag corresponding to the branch optical fiber is obtained, bandwidth allocation issued by the OLT is monitored, bandwidth allocation with the corresponding electronic tag is detected, initial communication is established with the OLT through the bandwidth allocation, normal communication (including data and/or management information transmission to the OLT) is carried out, wherein the difference between the logic distance of the branch optical fiber in a bandwidth item and the maximum logic distance is obtained by the ONU and used as balance delay, and the ONU waits for balance delay time before transmitting the management information or the data to the OLT in the corresponding bandwidth item.

In this embodiment, the initial communication includes that the ONU sends its own identity information, such as identification information like SN and MAC address, and/or authentication information like a password and a registration ID, to the OLT. In addition, the difference between the logical distance of the branch optical fiber and the maximum logical distance may also be sent to the ONU by the OLT after obtaining the identity information of the ONU during the initial communication.

Embodiment IV

ONU initiates OTDR ranging

In this embodiment, the passive optical network system supports 1 OLT and 16 ONUs. The OLT divides the bandwidth of each cycle into 48 bandwidth entries of equal length, which are numbered 1-48 for descriptive convenience.

Fig. 10 is an interaction diagram of a fourth embodiment of the present invention, and the specific working steps in this embodiment include:

and after the OLT is powered on, periodically sending the longest logic distance. And periodically issuing 48 bandwidth entries, wherein the 48 bandwidth entries are all identified as being not allocated to any ONU, and each bandwidth entry can be used for initial communication establishment between the ONU and the OLT.

And after the ONU is electrified, the longest logical distance issued by the OLT is obtained, the ONU is interacted with the OLT through the OTDR to obtain the logical distance between the ONU and the OLT, and the logical distance between the ONU and the OLT is locally compensated to be the longest logical distance.

The ONU monitors bandwidth allocation issued by the OLT, selects one bandwidth with an identifier of unallocated bandwidth, and sends self identity information, such as identification information of SN, MAC address and the like, and/or authentication information of password, registration ID and the like, to the OLT in the bandwidth.

The OLT listens for bandwidth marked as unallocated, and if correct ONU identification information and/or authentication information can be obtained, allocates fixed bandwidth entries, e.g. bandwidth entries numbered 1, 17, 33, to the ONU, which are subsequently marked as allocated.

And if the ONU does not obtain the bandwidth allocation of the OLT after reporting the self information in the time slot corresponding to the unallocated bandwidth entry, continuously selecting the unallocated bandwidth and sending the self information.

Fifth embodiment

OLT initiates ToD ranging

Fig. 11 is an interaction diagram of a fifth embodiment of the present invention, and the specific working steps in the embodiment include:

and after the OLT is powered on, periodically sending the longest logic distance. The OLT periodically issues 48 bandwidth entries, wherein the 48 bandwidth entries are all identified as being unassigned to any ONU, and each bandwidth entry can be used for initial communication establishment between the ONU and the OLT. The OLT periodically issues a ranging frame, and carries the ToD time for sending the frame in the ranging frame.

And after the ONU is powered on, acquiring the longest logical distance issued by the OLT, calculating the logical distance between the ONU and the OLT by monitoring the ranging frame and locally receiving the ToD time of the ranging frame for sending the ranging frame, and locally compensating the logical distance between the ONU and the OLT into the longest logical distance.

The ONU monitors bandwidth allocation issued by the OLT, selects one bandwidth entry with an identifier of unallocated bandwidth, and sends self identity information, such as identification information of SN, MAC address and the like, and/or authentication information of password, registration ID and the like, to the OLT in the bandwidth entry.

The OLT listens for bandwidth entries marked as unallocated, and if correct ONU identification information and/or authentication information can be obtained, allocates fixed bandwidth entries, e.g. bandwidth entries numbered 1, 17, 33, to the ONU, which are subsequently marked as allocated.

And if the ONU does not obtain the bandwidth allocation of the OLT after reporting the self information in the time slot corresponding to the unallocated bandwidth entry, continuously selecting the unallocated bandwidth entry and sending the self information.

Sixth embodiment

One-time distance measurement is needed after line updating

In this embodiment, the case of changing the optical fiber is considered in addition to the second and third embodiments.

The specific working steps in the embodiment include:

after the OLT is powered on, 48 bandwidth entries are periodically sent down, and 48 bandwidth entries are fixedly allocated, for example, 1, 17, 33 is allocated to the ONU corresponding to the electronic tag 1, 2, 18, 34 is allocated to the ONU corresponding to the electronic tag 2, 3, 19, 35 is allocated to the ONU corresponding to the electronic tag 3, and so on, and the difference between the logical distance of the corresponding branch optical fiber and the maximum logical distance is indicated in the bandwidth entry.

After the ONU is powered on, an electronic tag corresponding to the branch optical fiber is obtained, bandwidth allocation issued by the OLT is monitored, bandwidth allocation with the corresponding electronic tag is detected, initial communication is established with the OLT through the bandwidth allocation, normal communication (including data and/or management information sent to the OLT) is carried out, wherein the difference between the logic distance of the branch optical fiber in a bandwidth item and the maximum logic distance is obtained by the ONU and used as balance delay, and the ONU waits for balance delay time before sending information or data to the OLT in the corresponding bandwidth item.

In the operation process of the passive optical network system, a branch optical fiber needs to be replaced or repaired due to aging, faults and the like, when an ONU accesses the branch optical fiber, an OLT needs to set all bandwidth items to be measured, after the ONU is powered on, bandwidth allocation issued by the OLT is monitored, one identification is selected as the bandwidth item to be measured, and self identity information, such as identification information of SN, MAC address and the like, and/or authentication information of a password, a registration ID and the like, and the number of the selected bandwidth item are sent to the OLT in a time slot corresponding to the bandwidth item.

The OLT monitors information sent by the ONU, if correct ONU identification information and/or authentication information and a bandwidth entry number can be obtained, a ranging result is calculated according to the sending time and the receiving time of a corresponding bandwidth entry, the logical distance between the OLT and the ONU in the passive optical network is obtained, if the logical distance does not exceed the maximum logical distance, the maximum logical distance is not changed, the balance delay is configured for the ONU, otherwise, the maximum logical distance is changed to be larger than the logical distance of the ONU, the balance delay of other ONUs is updated, fixed bandwidth entries are allocated for the ONU, and the subsequent marks of the bandwidths are allocated.

The OLT continues to issue 48 parts of bandwidth periodically, wherein 3 parts of bandwidth allocated to the ONU is identified as allocated, other identifiers are not allocated, and each unallocated bandwidth entry can be used for initial communication establishment between the ONU and the OLT.

Example 4

The embodiment of the invention also provides a storage medium. Alternatively, in the present embodiment, the storage medium may be configured to store program codes for performing the following steps:

s1, dividing the uplink bandwidth in one cycle into a fixed number of bandwidth entries, wherein one or more bandwidth entries are used for one of: ranging, initial communication, and allocation to a designated ONU;

and S2, issuing the bandwidth items to the ONU.

Optionally, in this embodiment, the storage medium may include, but is not limited to: a U-disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a removable hard disk, a magnetic or optical disk, and other various media capable of storing program codes.

Optionally, in this embodiment, the processor performs dividing the upstream bandwidth in one cycle into a fixed number of bandwidth entries according to a program code stored in the storage medium, where one or more bandwidth entries are used for one of: ranging, initial communication, and allocation to a designated ONU;

optionally, in this embodiment, the processor executes, according to a program code stored in the storage medium, issuing the bandwidth entry to the ONU.

Optionally, the specific examples in this embodiment may refer to the examples described in the above embodiments and optional implementation manners, and this embodiment is not described herein again.

It will be apparent to those skilled in the art that the modules or steps of the present invention described above may be implemented by a general purpose computing device, they may be centralized on a single computing device or distributed across a network of multiple computing devices, and alternatively, they may be implemented by program code executable by a computing device, such that they may be stored in a storage device and executed by a computing device, and in some cases, the steps shown or described may be performed in an order different than that described herein, or they may be separately fabricated into individual integrated circuit modules, or multiple ones of them may be fabricated into a single integrated circuit module. Thus, the present invention is not limited to any specific combination of hardware and software.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A method of bandwidth allocation, comprising:

the optical line termination OLT divides the upstream bandwidth within a period into a fixed number of bandwidth entries, wherein one or more of said bandwidth entries is used for one of: ranging, initial communication, and allocation to a designated ONU; each bandwidth entry of the fixed number of bandwidth entries is the same length;

and the OLT issues the bandwidth items to an Optical Network Unit (ONU).

2. The method of claim 1, wherein one or more of the bandwidth entries are identified as one of the following attributes: to-be-measured, unallocated, allocated;

wherein the bandwidth entry to be measured is used for measuring the distance; the unallocated representation indicates that the bandwidth entry is used for initial communication; the allocated indicates that the bandwidth entry has been allocated to a specified ONU.

3. The method of claim 2, wherein the indication of the bandwidth entry to be used for ranging comprises:

and the OLT issues a first bandwidth to the ONU and records sending time, wherein the first bandwidth is identified as one or more bandwidth items to be measured.

4. The method of claim 3, wherein after the OLT issues the first bandwidth to the ONU, the method further comprises:

and after receiving the first bandwidth, the ONU selects one or more bandwidth entries in the first bandwidth, and sends a first bandwidth response to the OLT in the bandwidth entries, wherein the first bandwidth response comprises ONU identity information and the number of the bandwidth entries.

5. The method of claim 4, after the ONU sends a first bandwidth response to the OLT, further comprising:

and the OLT receives the first bandwidth response and records receiving time, acquires ONU identity information, calculates a ranging result of the ONU corresponding to the ONU identity information according to the sending time of the first bandwidth and the receiving time of the first bandwidth response, and acquires a logical distance between the OLT and the ONU in the passive optical network.

6. The method of claim 5, wherein after obtaining the logical distance from the OLT to the ONU, the method further comprises:

and the OLT updates the local logic distance between the OLT and the ONU or issues the logic distance between the OLT and the ONU to the ONU.

7. The method of claim 5, after the OLT obtains the logical distance between the OLT and the ONU in the passive optical network, further comprising:

and the OLT allocates a bandwidth entry for the ONU, and the bandwidth entry is used for the ONU to send data and/or management information to the OLT.

8. The method of claim 2, wherein the unallocated representation of the bandwidth entry for initial communication comprises:

and the OLT issues a second bandwidth to the ONU, wherein the second bandwidth is one or more bandwidth items marked as unallocated.

9. The method of claim 8, wherein the unallocated representation of the bandwidth entry is for initial communication, further comprising:

and after receiving the second bandwidth, the ONU selects one or more bandwidth entries in the second bandwidth, and sends a second bandwidth response to the OLT in the bandwidth entries, wherein the second bandwidth response comprises ONU identity information.

10. The method of claim 8, wherein after the ONU sends the second bandwidth response, further comprising:

and the OLT receives the second bandwidth response and acquires the ONU identity, and allocates a bandwidth item for the ONU, wherein the bandwidth item is used for the ONU to send data and/or management information to the OLT.

11. The method of claim 2, wherein the allocated indication that the bandwidth entry has been allocated to a specified ONU comprises:

when the bandwidth entries are multiple, there may be no interval or an interval between the bandwidth entries, and when there is an interval between the bandwidth entries, the intervals between the bandwidth entries are the same or different, and the minimum value of the intervals satisfies the delay requirement of the system.

12. The method of claim 11, wherein after the bandwidth entry has been allocated to the designated ONU, further comprising:

and the specified ONU sends data and/or management information to the OLT in the bandwidth item.

13. The method of claim 11, wherein before the bandwidth entry has been allocated to the designated ONU, further comprising:

and the OLT acquires the ONU identity information.

14. The method according to any of claims 4, 5, 9, and 13, wherein the ONU identity information comprises at least one of: serial number SN, MAC address, password, registration ID.

15. The method of claim 1, before the OLT issues one or more of the bandwidth entries for initial communication to the ONU, further comprising:

and the OLT acquires a logical distance between the OLT and the ONU.

16. The method of claim 1, before the OLT issues one or more of the bandwidth entries for initial communication to the ONU, further comprising:

the OLT sets the longest logical distance between the OLT and the ONU, wherein the logical distance between the OLT and all the ONUs is smaller than or equal to the longest logical distance.

17. The method of claim 16, after the OLT sets a longest logical distance between the OLT and the ONU, further comprising:

and the OLT issues the longest logical distance between the OLT and the ONU.

18. The method of claim 15, wherein the OLT acquiring the logical distance to the ONU comprises:

the logical distance between the OLT and the ONU is configured into the OLT.

19. The method of claim 15, wherein the OLT acquiring the logical distance to the ONU comprises:

the OLT measures the distance of the ONU on a third wavelength and obtains the distance measurement result of the OLT and the ONU on the third wavelength;

and the OLT calculates the logical distance between the OLT and the ONU on the working wavelength according to the ranging result on the third wavelength and the wavelength relation.

20. The method of claim 17, wherein the OLT issues the longest logical distance between the OLT and the ONU, comprising:

and the ONU tests the logical distance between the ONU and the OLT through an Optical Time Domain Reflectometer (OTDR) technology, wherein the wavelength used by the OTDR is different from the working wavelength.

21. The method of claim 17, wherein the OLT issues the longest logical distance between the OLT and the ONU, comprising:

the OLT sends a ranging data packet with sending time;

the ONU receives the ranging data packet, records local receiving time, obtains sending time in the ranging data packet, and calculates the logical distance between the ONU and the OLT according to the local receiving time and the sending time;

wherein the OLT and the ONU are provided with a circadian ToD condition.

22. The method according to any of claims 20 to 21, wherein the ONU, after obtaining the logical distance to the OLT, further comprises:

the ONU obtains the longest logical distance between the OLT and the ONU;

and the ONU carries out local compensation, wherein the compensation is that the logic distance between the OLT and the ONU is subtracted from the longest logic distance.

23. The method of claim 18, wherein the logical distance between the OLT and the ONU is configured into the OLT, further comprising:

the branch optical fiber connected with the ONU is provided with an electronic tag;

the OLT associates the electronic tag, the difference value between the logical distance between the ONU and the OLT and the longest logical distance, and the OLT issues the electronic tag and the difference value;

and the ONU identifies the electronic tag on the connected branch optical fiber, obtains the difference value corresponding to the electronic tag and carries out local compensation.

24. A bandwidth allocation method is applied to an OLT, and comprises the following steps:

and the OLT issues the bandwidth items to an Optical Network Unit (ONU).

25. The method of claim 24, wherein one or more of the bandwidth entries are identified as one of the following attributes: to-be-measured, unallocated, allocated;

26. The method of claim 25, wherein the indication of the bandwidth entry to be used for ranging comprises:

27. The method of claim 26, wherein the bandwidth entry to be measured is used for ranging, further comprising:

the OLT receives a first bandwidth response sent by the ONU and records receiving time, obtains ONU identity information and the serial number of a bandwidth item from the first bandwidth response, and calculates the ranging result of the ONU corresponding to the ONU identity information according to the sending time of the first bandwidth and the receiving time of the first bandwidth response to obtain the logical distance between the OLT and the ONU in the passive optical network.

28. The method of claim 27, wherein after obtaining the logical distance from the OLT to the ONU, the method further comprises:

29. The method of claim 27, wherein after obtaining the logical distance from the OLT to the ONU, the method further comprises:

30. The method of claim 25, wherein the unallocated representation of the bandwidth entry for initial communication comprises:

31. The method of claim 30, wherein the unallocated representation of the bandwidth entry for initial communication further comprises:

and after receiving a second bandwidth response sent by the ONU, the OLT obtains ONU identity information, and allocates a bandwidth item for the ONU, wherein the bandwidth item is used for the ONU to send data and/or management information to the OLT.

32. The method of claim 25, wherein the allocated indication that the bandwidth entry has been allocated to a specified ONU comprises:

33. A method of bandwidth allocation, comprising:

an optical network unit ONU receives bandwidth entries issued by an optical line terminal OLT, wherein one or more of the bandwidth entries are used for one of the following: ranging, initial communication, and allocation to a designated ONU; each of the plurality of the bandwidth entries is the same length.

34. The method of claim 33, wherein one or more of the bandwidth entries are identified as one of the following attributes: to-be-measured, unallocated, allocated;

wherein the bandwidth entry to be measured is used for measuring the distance; the unallocated representation indicates that the bandwidth entry is used for initial communication; the allocated indicates that the bandwidth has been allocated to a specified ONU.

35. The method of claim 34, wherein the indication of the bandwidth entry to be used for ranging comprises:

and the ONU receives a first bandwidth issued by the OLT, wherein the first bandwidth is identified as one or more bandwidth items to be measured.

36. The method of claim 35, wherein after receiving the first bandwidth sent by the OLT, the ONU further comprises:

the ONU selects one or more bandwidth entries in the first bandwidth, and sends a first bandwidth response to the OLT within the bandwidth entries, wherein the first bandwidth response comprises ONU identity information and the number of the bandwidth entry.

37. The method of claim 34, wherein the unallocated representation of the bandwidth entry for initial communication comprises:

and the ONU receives a second bandwidth issued by the OLT, wherein the second bandwidth is one or more bandwidth items marked as unallocated.

38. The method of claim 37, wherein after receiving the second bandwidth sent by the OLT, the ONU further comprises:

and the ONU selects one or more bandwidth entries in the second bandwidth, and sends a second bandwidth response to the OLT in the bandwidth entries, wherein the second bandwidth response comprises ONU identity information.

39. The method of claim 34, wherein the allocated indication that the bandwidth has been allocated to a specified ONU comprises:

40. The method of claim 39, wherein after the bandwidth entry has been allocated to the designated ONU, further comprising:

41. A bandwidth distribution device applied to an Optical Line Terminal (OLT), comprising:

an allocation module, configured to divide an uplink bandwidth in one cycle into a fixed number of bandwidth entries, where one or more of the bandwidth entries are used for one of: ranging, initial communication, and allocation to a designated ONU; each bandwidth entry of the fixed number of bandwidth entries is the same length;

and the issuing module is used for issuing the bandwidth items to an Optical Network Unit (ONU).

42. The apparatus of claim 41, wherein each of the bandwidth entries is identified as one of the following attributes: to-be-measured, unallocated, allocated;

wherein the to-be-ranging indicates that a current bandwidth entry is used for ranging; the unallocated representation indicates a current bandwidth for an initial communication; the allocated indicates that the current bandwidth has been allocated to the specified ONU.

43. A bandwidth distribution device is applied to an Optical Network Unit (ONU), and comprises:

a receiving module, configured to receive bandwidth entries issued by an optical line terminal OLT, where one or more of the bandwidth entries are used to: ranging, initial communication, and allocation to a designated ONU; each of the plurality of the bandwidth entries is the same length.

44. The apparatus of claim 43, wherein one or more of the bandwidth entries are identified as one of the following attributes: to-be-measured, unallocated, allocated;

45. A bandwidth distribution system, comprising: an optical line terminal OLT, an optical network unit ONU, wherein,

the OLT includes:

the issuing module is used for issuing the bandwidth items to an Optical Network Unit (ONU);

the ONU includes:

a receiving module, configured to receive the bandwidth entry sent by the OLT.

46. The system according to claim 45, wherein one or more of said bandwidth entries are identified as one of the following attributes: to-be-measured, unallocated, allocated;

47. The system of claim 45, wherein the OLT further comprises:

and the acquisition module is used for acquiring the logical distance between the ONU and the bandwidth item before the issuing module issues the one or more bandwidth items for initial communication to the ONU.

48. The system of claim 45, wherein the OLT further comprises:

a setting module, configured to set a longest logical distance between the OLT and the ONU before the issuing module issues the one or more bandwidth entries for initial communication to the ONU, where a logical distance between the OLT and all the ONUs is less than or equal to the longest logical distance.

49. A storage medium comprising a stored program, wherein the program when executed performs the method of any of claims 1 to 40.

50. A processor, configured to run a program, wherein the program when running performs the method of any one of claims 1 to 40.